Schaeffler Product catalogue - medias
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Drawn cup roller clutches
 

Drawn cup roller clutches:

 
 
  • are one-way clutches, which transmit torques in one direction ➤ Figure 1
  • are available with or without an integrated bearing arrangement ➤ Figure 2, ➤ Figure 3 and ➤ Figure 4
  • give very precise indexing
  • allow high indexing frequencies
  • have a low overrunning frictional torque
  • are available with or without greasing
  • are particularly compact in a radial direction and therefore permit extremely compact designs
  • are suitable for housing
    See Mounting dimenstions
    materials made from steel, light metal or plastic
  • can be combined with drawn cup needle roller
    See Rolling element
    bearings
    with open ends HK and drawn cup needle roller
    See Rolling element
    bearings
    with closed end BK
  • have an extensive range of applications, for example as indexing clutches, back-stopping clutches and overrunning clutches ➤ Figure 1.
 
   

Figure 1
Drawn cup roller clutches in tandem arrangement in an indexing system

Symbole/00016410_mei_in_0k_0k.gif  Stationary component
Symbole/00016411_mei_in_0k_0k.gif  Component performs a swivel motion
Symbole/00016412_mei_in_0k_0k.gif  Component performs a gradual rotational motion

 

imageref_22689424651_All.gif

 
 

Product design

 
 

Drawn cup roller clutches are available:

 
 
  • without bearing arrangement
    ➤ Figure 2
  • with bearing arrangement
    Arrangement of bearings, for example locating/locating, semi-locating/semi-locating, non-locating/non-locating, or semi-locating bearings in tandem, O or X arrangement
    (rolling or plain bearing)
    ➤ Figure 3 and ➤ Figure 4.
 
 

Drawn cup roller clutches

Drawn cup roller clutches are one-way clutches

 

These drawn cup roller clutches comprise thin-walled, drawn outer cups with a series of ramps on the inside diameter, plastic cages and needle rollers, which serve as clamping elements. Steel or plastic springs hold the needle rollers
Cylindrical rolling elements with a high length/diameter ratio (DIN 5402 Part 3)
in their clamped position. Drawn cup roller clutches can transmit high torques in one direction and are particularly compact in a radial direction. The roller clutches are available with and without support bearing arrangements.

 

Suitable for applications with high indexing frequencies

 

Drawn cup roller clutches give very precise indexing, since the individual spring loading
Point at which a load acts within the co-ordinate system
of the needle rollers
Cylindrical rolling elements with a high length/diameter ratio (DIN 5402 Part 3)
ensures continuous contact between the shaft, needle rollers
Cylindrical rolling elements with a high length/diameter ratio (DIN 5402 Part 3)
and ramps. They allow high indexing frequencies due to their low mass and the resulting low moment of inertia of the clamping elements. They also have a low overrunning frictional torque.

 

Preferred areas of application

 

Drawn cup roller clutches can be used in various applications such as indexing clutches, back-stopping clutches and overrunning clutches. In these cases, the drawn cup roller clutch performs an overrunning or locking function.

 
imageref_17757187211_All.gif   Drawn cup roller clutches should not be used if a malfunction could lead to personal injury. New applications, especially those involving extreme conditions, should first be verified by tests. Correct functioning can only be guaranteed if the concentricity error between the support bearing and the shaft can be kept to a low value.  
 

Drawn cup roller clutches without bearing arrangement

Suitable for supporting torques only

 

Roller clutches HF do not have a bearing arrangement, i.e. they transmit torques only and, as a result, are unable to support any radial forces ➤ Figure 2. In the case of these roller clutches, concentricity to the shaft axis must be secured by additional rolling bearings or drawn cup roller clutches with a bearing arrangement
Arrangement of bearings, for example locating/locating, semi-locating/semi-locating, non-locating/non-locating, or semi-locating bearings in tandem, O or X arrangement
must be used. The drawn cup roller clutches are available with and without knurling.

 

Drawn cup roller clutches without knurling

 

Drawn cup roller clutches without knurling are available with steel or plastic pressure springs ➤ Figure 2. Bearings with plastic springs have the suffix KF ➤ section .

 

Drawn cup roller clutches with knurling

 

For improved torque transmission in plastic housings, drawn cup roller clutches are available with a knurled outside surface. These drawn cup roller clutches have the suffix R ➤ section . The knurling can be applied to part of the drawn cup or over its entire length. The drawn cup roller clutches are also available with steel or plastic pressure springs. Roller clutches with plastic springs have the suffix KF ➤ section .

 
   

Figure 2
Drawn cup roller clutches without bearing arrangement, with and without knurling

Symbole/00016410_mei_in_0k_0k.gif  Without knurling
Symbole/00016411_mei_in_0k_0k.gif  With knurling

 

imageref_22689597963_All.gif

 
 

Drawn cup roller clutches with bearing arrangement

Also suitable for supporting radial forces

 

Due to the integrated plain or rolling bearing, roller clutches HFL can also support radial forces in addition to torques ➤ Figure 3 and ➤ Figure 4. The drawn cup roller clutches are available with and without knurling.

 

Drawn cup roller clutches without knurling

 

Drawn cup roller clutches without knurling are available with steel or plastic pressure springs ➤ Figure 3 and ➤ Figure 4. Drawn cup roller clutches with plastic springs have the suffix KF ➤ section .

 

Drawn cup roller clutches with knurling

 

For improved torque transmission in plastic housings, drawn cup roller clutches are available with a knurled outside surface. These drawn cup roller clutches have the suffix R ➤ section . The knurling can be applied to part of the drawn cup or over its entire length. These drawn cup roller clutches are also available with steel or plastic pressure springs. Roller clutches with plastic springs have the suffix KF ➤ section .

 
 

   

Figure 3
Drawn cup roller clutches with plain bearing arrangement, with and without knurling

Fr =  radial load
Symbole/00016410_mei_in_0k_0k.gif  Without knurling
Symbole/00016411_mei_in_0k_0k.gif  With knurling
Symbole/00016412_mei_in_0k_0k.gif  Plain bearing

 

imageref_22689599883_All.gif

 
   

Figure 4
Drawn cup roller clutch with rolling bearing
Ready-to-fit machine element, often defined in standards, for transmitting movements, loads and tilting moments with a high level of efficiency; rolling bearings consist of rolling elements, cages and raceways on rings, guideways or carriages as well as lubricant and, if necessary, seals and accessories
arrangement, without knurling

Fr =  radial load
Symbole/00016410_mei_in_0k_0k.gif  Rolling bearing

 

imageref_22689601803_All.gif

 
 

Clamping direction of the drawn cup roller clutch

imageref_17757187211_All.gif   An arrow on the end face of the drawn cup indicates the clamping direction of the drawn cup roller clutch. The roller clutch clamps when the drawn cup is rotated in the direction of the arrow.  
 

Load carrying capacity

 

Roller clutches with a support bearing arrangement
Arrangement of bearings, for example locating/locating, semi-locating/semi-locating, non-locating/non-locating, or semi-locating bearings in tandem, O or X arrangement
accommodate radial forces

 

Depending on the design (with or without bearing arrangement), drawn cup roller clutches can either transmit torques only or additional radial loads ➤ section , ➤ Figure 3 and ➤ Figure 4. For roller clutches without bearing arrangement, radial forces must be supported by additional bearings.

 
 

Transmissible torque

The rigidity
Resistance to displacement under load in the elastic deformation area, dependent on bearing clearance and bearing type

See Deflection
of the housing
See Mounting dimenstions
determines the transmissible torque

 

Transmission of torque requires a rigid housing. The transmissible torque is therefore dependent on the shaft and housing
See Mounting dimenstions
material, the shaft hardness, the wall thickness of the housing
See Mounting dimenstions
and the shaft and housing
See Mounting dimenstions
tolerances. When calculating the torque, the maximum drive torque and the moment of inertia of the masses during acceleration must be taken into consideration.

 
 

Limiting load

Do not exceed the limiting load

 

In the case of drawn cup roller clutches with plain bearings, the product calculated from the actual speed n and radial load FR must not exceed the value stated for the limiting load (Fr · n)max. The operating limits are determined by the limiting speeds stated in the product tables and the permissible radial load.

 
 

Indexing accuracy
Deviation of the actual dimension from the nominal dimension as described by tolerances. For monorail systems, the parallel deviation of the reference surfaces within given tolerances.

See
Running accuracy
Dimensional accuracy
and indexing frequency

The roller clutch must not be overloaded

 

In order not to overload the clutch, the inertia of the entire system must be taken into consideration. The high indexing accuracy
Deviation of the actual dimension from the nominal dimension as described by tolerances. For monorail systems, the parallel deviation of the reference surfaces within given tolerances.

See
Running accuracy
Dimensional accuracy
is due to the individual spring loading
Point at which a load acts within the co-ordinate system
of the needle rollers, which ensures continuous contact between the shaft, needle rollers
Cylindrical rolling elements with a high length/diameter ratio (DIN 5402 Part 3)
and clamping surface. The indexing accuracy
Deviation of the actual dimension from the nominal dimension as described by tolerances. For monorail systems, the parallel deviation of the reference surfaces within given tolerances.

See
Running accuracy
Dimensional accuracy
is influenced by the indexing frequency, lubrication, fitting tolerances, adjacent construction, elastic deformation
Occurs between the rolling elements and the raceways in loaded rolling bearings providing the lubricant satisfies Hooke_s law.

See Cold welding
of the adjacent parts and the drive method, either through the shaft or the housing. Optimum accuracy
Deviation of the actual dimension from the nominal dimension as described by tolerances. For monorail systems, the parallel deviation of the reference surfaces within given tolerances.

See
Running accuracy
Dimensional accuracy
is achieved if the drive is via the shaft.

 

High indexing frequencies due to low mass

 

High indexing frequencies are due to the low mass and the resulting low moment of inertia of the clamping elements.

 
 

Frictional torque and frictional energy

 

For pattern of frictional torque ➤ Figure 5. The overrunning frictional energy at idle is dependent on whether the shaft or the outer ring is rotating ➤ Figure 6.

 
   

Figure 5
Overrunning frictional torque, as a function of shaft diameter

MR =  overrunning frictional torque
d =  shaft diameter

 

imageref_22690137227_All.gif

 
   

Figure 6
Overrunning frictional energy, as a function of speed

NR =  overrunning frictional energy
n =  speed
nGA =  limiting speed with rotating outer ring
nGW =  limiting speed with rotating shaft

 

imageref_22690139147_All.gif

 
 

Rotating outer ring

Due to the centrifugal force, the needle rollers
Cylindrical rolling elements with a high length/diameter ratio (DIN 5402 Part 3)
may lift off the shaft

 

If the outer ring rotates, the frictional energy increases with speed at first but then, due to the centrifugal force of the needle rollers, it decreases gradually towards zero. At this speed, there is no longer any frictional contact between the needle rollers
Cylindrical rolling elements with a high length/diameter ratio (DIN 5402 Part 3)
and the shaft. Due to the increasing centrifugal force, the needle rollers
Cylindrical rolling elements with a high length/diameter ratio (DIN 5402 Part 3)
lift off the shaft.

 
 

Compensation of angular misalignments

 
imageref_17757187211_All.gif   Concentricity is an essential precondition for correct functioning of the roller clutch. Correct functioning can only be guaranteed if the concentricity error between the support bearing and the shaft can be kept to a low value.  
 

Lubrication

 

A grease
See
Lubricant
Grease cartridge
Fatty acids
to GA26 is used for initial greasing

 

The roller clutches are greased using a lithium soap grease
Lubricating grease based on lithium soap, mineral oil and/or synthetic oil
to GA26. In many cases, the initial greasing is sufficient to last the operating life
See Life, rating
of the bearings. For applications with oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
lubrication, roller clutches are available without greasing. These roller clutches are coated with a preservative. For general applications (mixed operation involving locking and overrunning), the Schaeffler initial greasing has proved effective. In order to ensure optimum function, it may be necessary to use different lubricants. The suitability of the lubricant
Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements.
must then be verified by means of tests.

 
imageref_18348417035_All.gif   For applications in which one operating condition (overrunning or locking) is heavily predominant, a special greasing should be used. In this case, please consult Schaeffler.  

A grease
See
Lubricant
Grease cartridge
Fatty acids
operating life
See Life, rating
cannot be calculated

 

It is not possible to calculate the grease
See
Lubricant
Grease cartridge
Fatty acids
operating life
See Life, rating
or lubrication
Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.

See
Lubrication method
Lubrication condition
Recirculating lubrication
Lubrication technology
One-off lubrication
Hydrodynamic lubrication
Lubricant change intervall
Lubricant change
Lubricant
Lubricant paste
Oil
Grease
Lubrication film
Lubrication system
interval for drawn cup roller clutches. If relubrication is carried out, oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
should used for lubrication
Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.

See
Lubrication method
Lubrication condition
Recirculating lubrication
Lubrication technology
One-off lubrication
Hydrodynamic lubrication
Lubricant change intervall
Lubricant change
Lubricant
Lubricant paste
Oil
Grease
Lubrication film
Lubrication system
or a changeover to oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
lubrication
Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.

See
Lubrication method
Lubrication condition
Recirculating lubrication
Lubrication technology
One-off lubrication
Hydrodynamic lubrication
Lubricant change intervall
Lubricant change
Lubricant
Lubricant paste
Oil
Grease
Lubrication film
Lubrication system
should generally be made. At temperatures < –10 °C and speeds > 0,7 nG, recommendations on lubrication
Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.

See
Lubrication method
Lubrication condition
Recirculating lubrication
Lubrication technology
One-off lubrication
Hydrodynamic lubrication
Lubricant change intervall
Lubricant change
Lubricant
Lubricant paste
Oil
Grease
Lubrication film
Lubrication system
should be requested. At temperatures over +70 °C, oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
lubrication
Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.

See
Lubrication method
Lubrication condition
Recirculating lubrication
Lubrication technology
One-off lubrication
Hydrodynamic lubrication
Lubricant change intervall
Lubricant change
Lubricant
Lubricant paste
Oil
Grease
Lubrication film
Lubrication system
should be used. The oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
level should be such that, when the drawn cup roller clutch is stationary and the axis is horizontal, it is immersed approx. 1/3 in the oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
bath.

 

Suitable lubricating oils

 

Suitable oils are CL and CLP to DIN 51517 or HL and HLP to DIN 51524. Viscosity
The toughness of an oil, dependent on temperature and pressure; the viscosity decreases with increasing temperature and increases with increasing pressure; viscosity is the ability of a fluid to resist reciprocal laminar displacement (deformation) of two adjacent layers (DIN 1342, DIN 51550, ISO 3104)
classes ➤ Table 1.

 

Compatibility with plastic cages

 

When using bearings with plastic cages, compatibility between the lubricant
Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements.
and the cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
material must be ensured if synthetic oils, lubricating greases
Consistent grease with a mineral oil and/or synthetic oil base with thickener as well as active ingredients or additives. See DIN 51 825 part 1 for demands on greases, grease type K, operating temperature range -20 to 140°C or DIN 51 825 part 2, for grease type KT.
with a synthetic oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
base or lubricants containing a high proportion of EP additives are used.

 
 

   
Table 1
Viscosity classes
 

Operating temperature
Viscosity class
°C
from
to
+15
+30
ISO VG 10
+15
+90
ISO VG 32
+60
+120
ISO VG 100

 
 

Sealing

 
 

Drawn cup roller clutches (with and without bearing arrangement) are supplied without seals. Contaminants (dust, dirt and moisture) can impair the function and operating life
See Life, rating
of roller clutches.

 
 

Sealing of the bearing position with sealing rings G or SD

Effective sealing
See Seals
elements for use in sealing
See Seals
open drawn cup roller clutches with a risk of contamination

 

If there is a risk of contamination, sealing
See Seals
rings of economical series G or SD should be fitted ➤ link . The sealing
See Seals
rings are designed as contact seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
and are arranged in front of the roller clutch. They protect the bearing position reliably against contamination, spray water and excessive loss of grease. The sealing
See Seals
rings are matched to the small radial dimensions of the drawn cup roller clutches and can be combined with wider inner rings of series IR. They are very easy to fit, since they are simply pressed into the housing
See Mounting dimenstions
bore.

 
 

Speeds

 

Speeds for rotating shaft or rotating outer ring

 

The limiting speeds nGW and nGA in the product tables are valid for oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
and grease
See
Lubricant
Grease cartridge
Fatty acids
lubrication. The limiting speed nGW is valid for a rotating shaft, while nGA is valid for a rotating outer ring.

 
 

Noise

 
 

Schaeffler Noise Index

 

The Schaeffler Noise Index (SGI) is not yet available for this bearing type    ➤ link. The data for these bearing series will be introduced and updated in stages.

 
 

Temperature range

 
 

Possible operating temperatures of drawn cup roller clutches ➤ Table 2.

 
   
Table 2
Permissible temperature ranges
 

Operating temperature
Drawn cup roller clutches
imageref_19988082955_All.gif
   
–10 °C to +70 °C, limited by the lubricant

 
imageref_18348417035_All.gif   In the event of anticipated temperatures which lie outside the stated values, please contact Schaeffler.  
 

Cages

 
 

Plastic cages are used in the guidance of rolling elements for roller clutches and for integrated support bearing arrangements supported by rolling elements.

 
 

Internal clearance

 

The enveloping circle diameter Fw applies instead of the radial internal clearance

 

In the case of bearings without inner ring, the dimension for the enveloping circle diameter Fw is used instead of the radial internal clearance. The enveloping circle is the inner inscribed circle of the needle rollers
Cylindrical rolling elements with a high length/diameter ratio (DIN 5402 Part 3)
in clearance-free contact with the outer raceway. In drawn cup roller clutches with a rolling bearing
Ready-to-fit machine element, often defined in standards, for transmitting movements, loads and tilting moments with a high level of efficiency; rolling bearings consist of rolling elements, cages and raceways on rings, guideways or carriages as well as lubricant and, if necessary, seals and accessories
arrangement, the enveloping circle diameter Fw of the bearings once fitted (in the solid section ring gauge) is approximately in tolerance class F8. Upper and lower deviations of enveloping circle diameter for tolerance class F8 ➤ Table 3.

 
   
Table 3
Deviations of enveloping circle diameter for drawn cup roller clutches supported by rolling bearings
 

Enveloping circle diameter Fw
Tolerance class F8
mm
Tolerance for enveloping circle diameter Fw
upper deviation
lower deviation
over
incl.
μm
μm
3
6
+28
+10
6
10
+35
+13
10
18
+43
+16
18
30
+53
+20
30
50
+64
+25

 
 

Dimensions, tolerances

 
 

Dimensions and tolerances
See
Running accuracy
Dimensional accuracy
of drawn cup roller clutches are not standardised. The thin-walled outer cups adopt the dimensional and geometrical accuracy
Deviation of the actual dimension from the nominal dimension as described by tolerances. For monorail systems, the parallel deviation of the reference surfaces within given tolerances.

See
Running accuracy
Dimensional accuracy
of the housing
See Mounting dimenstions
bore.

 
 

Suffixes

 
 

For a description of the suffixes used in this chapter ➤ Table 4 and medias interchange http://www.schaeffler.de/std/1D52.

 
   
Table 4
Suffixes and corresponding descriptions
 

Suffix
Description of suffix
- Steel springs
Standard
KF
Plastic pressure springs
R
Knurled outside surface
RR
Drawn cup roller clutch with Corrotect
Thin, galvanic plating containing zinc alloys (binary, ternary) applied to hardened rolling bearing raceways for corrosion protection
coating
Special design, available by agreement

 
 

Structure of the product designation

 

Examples of composition of product designation

 

The designation
Identification of a bearing by letters and numbers, indicating, for example, the series, dimensional series or size code, bore diameter, bearing design and information such as Corrotect plating or length of guideways
of drawn cup roller clutches follows a set model. Examples ➤ Figure 7 and ➤ Figure 8.

 
   

Figure 7
Drawn cup roller clutch without bearing arrangement, without knurling: designation
Identification of a bearing by letters and numbers, indicating, for example, the series, dimensional series or size code, bore diameter, bearing design and information such as Corrotect plating or length of guideways
structure


 

imageref_22689467531_en.gif

 
   

Figure 8
Drawn cup roller clutch with bearing arrangement, plastic pressure springs, with knurling: designation
Identification of a bearing by letters and numbers, indicating, for example, the series, dimensional series or size code, bore diameter, bearing design and information such as Corrotect plating or length of guideways
structure


 

imageref_22689472267_en.gif

 
 

Dimensioning

 
 

The size is determined on the basis of the load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
carrying capacity of the drawn cup roller clutch relative to the loads and the requirements for rating life
The basic rating life is the life reached or exceeded by 90% of a sufficiently large group of apparently identical bearings before the first evidence of material fatigue develops
and operational reliability ➤ section .

 
 

Design of the adjacent construction

 
 

Design of housing
See Mounting dimenstions
bore

Support outer cup over entire circumference and width

 

Suitable housing
See Mounting dimenstions
materials are steel, light metal or plastic. In order to allow full utilisation of the performance capability of drawn cup roller clutches and achieve the requisite rating life, sufficient rigid support must be provided for the outer cups in the housing. The support for the outer cup in the housing
See Mounting dimenstions
bore can be produced as a cylindrical seating surface. The seating surfaces
The effective surface is the surface which separates the object from its surrounding medium.The actual surface is the approximate image from measuring technology of the ideal geometric surface. Note: various measuring processes or measuring conditions (e.g. stylus radius) can give different actual surfaces.The geometric surface is an ideal surface whose nominal form is defined by a drawing or other technical documentation. See DIN 4760 for further details.

See
Surface protection
Surface tension
for the outer cup and the raceway for the rolling elements or inner ring (if the bearing arrangement
Arrangement of bearings, for example locating/locating, semi-locating/semi-locating, non-locating/non-locating, or semi-locating bearings in tandem, O or X arrangement
is not produced as a direct bearing arrangement) should not be interrupted by grooves, holes or other recesses. The accuracy
Deviation of the actual dimension from the nominal dimension as described by tolerances. For monorail systems, the parallel deviation of the reference surfaces within given tolerances.

See
Running accuracy
Dimensional accuracy
of the mating parts must meet specific requirements, the bore tolerances
See
Running accuracy
Dimensional accuracy
for the housing
See Mounting dimenstions
bore (rec­ommended tolerance classes) are dependent on the housing
See Mounting dimenstions
material ➤ Table 5 and ➤ Table 6. The surface quality
See DIN 55 350 part 11 and ISO 8402 for terminology and definitions.
of the housing
See Mounting dimenstions
bore should be Ramax 0,8. The cylindricity tolerance of the housing
See Mounting dimenstions
bore in metal housings should be within the tolerance grade IT5/2.

 
imageref_17757187211_All.gif   Due to the thin-walled outside surface, the roller clutches only adopt their precise geometry once they have a tight fit. As a result, the accuracy
Deviation of the actual dimension from the nominal dimension as described by tolerances. For monorail systems, the parallel deviation of the reference surfaces within given tolerances.

See
Running accuracy
Dimensional accuracy
of the locating bore essentially determines the geometrical accuracy
Deviation of the actual dimension from the nominal dimension as described by tolerances. For monorail systems, the parallel deviation of the reference surfaces within given tolerances.

See
Running accuracy
Dimensional accuracy
of the drawn cup and thus the functioning of the clutch.
 

Provide lead chamfer on the housing
See Mounting dimenstions
bore

 

For the drawn cup roller clutches to be mounted without damage, the housing
See Mounting dimenstions
bore must have a lead chamfer of 15°.

 
   
Table 5
Design of housing
See Mounting dimenstions
bore
 

Series
Springs
Bore
Housing material
Steel
Cast iron
Light metal
Max. bore
in plastic2)
HF, HFL
Steel
N6 Ⓔ (N7 Ⓔ)1)
R6 Ⓔ (R7 Ⓔ)1)
-
HF..-KF, HFL..-KF
Plastic
N7 Ⓔ
R7 Ⓔ
-
HF..-R, HFL..-R
Steel
- - D
0–0,05
HF..-KF-R, HFL..-KF-R
Plastic
- - D
0–0,05
HFL0606-KF-R, HFL0806-KF-R
Plastic
- - D
0–0,05

 
 
______
 1    The values in brackets can be used if the actual torque is no more than 50% of the permissible torque Md per in accordance with the product table.
 
 
 2    Guide values as a function of the plastic used. Outside diameter D ➤ dimension table.
 
 

Minimum wall thickness for metal housings

Maximum transmissible torque

 

For metal housings, the maximum transmissible torque Md per max is determined as a function of the diameter ratio QA to ➤ Figure 9 (steel housing) or to ➤ Figure 10 (aluminium housing), see calculation examples.

 
 

Guide values for QA max with steel and aluminium as housing
See Mounting dimenstions
materials ➤ Table 6.

 
   
Table 6
Guide values
 

Housing material
Diameter ratio
QA max
Steel
0,8
Aluminium
0,6

 
imageref_17757187211_All.gif   The comparative stress σv must not exceed the yield stress
Mechanical, mechanical-thermal, mechanical-chemical or tribological influences acting individually or jointly on a component
of the housing
See Mounting dimenstions
material.
 
 

Steel housing

 

For drawn cup roller clutches HF0612, the maximum transmissible torque Md per max should be determined ➤ Figure 9:

 
 
 

Calculation example

 

Drawn cup roller clutch
HF0612
Housing
Steel
Housing bore tolerance
N6 Ⓔ ➤ Table 5
Permissible housing
See Mounting dimenstions
stress (Rp0,2) σv
450 N/mm2
Diameter ratio QA of housing
0,9
Permissible torque Md per
in accordance with product table

 
 
 

Calculation

 

 

Md per max
=
60% Md per

   

   
=
0,6 · 1,76 Nm

   

   
=
1,056 Nm

   

 

 
   

Figure 9
Steel housing

Modulus of elasticity
Reciprocal of Rigidity
E = 210 000 N/mm2
QA =  diameter ratio of housing
DAi =  housing bore
DAa =  housing outside diameter
Md per =  permissible torque
Md per max =  maximum transmissible torque
σv =  comparative stress

 

imageref_22689476619_All.gif

 
 

Aluminium housing

 

For drawn cup roller clutch HF1616, the diameter ratio QA of the housing
See Mounting dimenstions
should be determined ➤ Figure 10:

 
 
 

Calculation example

 

Drawn cup roller clutch
HF1616
Housing
Aluminium
Housing bore tolerance
R6 Ⓔ ➤ Table 5
Permissible housing
See Mounting dimenstions
stress (Rp0,2) σv
250 N/mm2
Maximum transmissible
torque Md per max
10 Nm
Permissible torque Md per
in accordance with product table

 
giving Md per max/Md per
50%

 
 
 

Calculation

 

 

QA
=
DAi/DAa ≦ 0,7

   
DAa

DAi/0,7 = 22 mm/0,7

   

   
=
31,5 mm

   

 

 
   

Figure 10
Aluminium housing

Modulus of elasticity
Reciprocal of Rigidity
E = 70 000 N/mm2
QA =  diameter ratio of housing
DAi =  housing bore
DAa =  housing outside diameter
Md per =  permissible torque
Md per max =  maximum transmissible torque
σv =  comparative stress

 

imageref_22689594891_All.gif

 
 

Minimum wall thickness for plastic housings

imageref_17757187211_All.gif   For plastic housings, drawn cup roller clutches with a partially or fully knurled outside surface should be used (suffix R).  
 

  The guide value for the minimum wall thickness of plastic housings is:

Equation 1
 
imageref_10903639691_All.gif

Legend

 
smin
 mm
Minimum wall thickness
D
 mm
Outside diameter of roller clutch
Fw
 mm
Enveloping circle.
 
 

Axial location

A tight fit is usually sufficient for axial location

 

Drawn cup roller clutches give very easy mounting and permit simple adjacent constructions. The drawn cup roller clutches are pressed into the housing
See Mounting dimenstions
bore and require no further axial location. The precondition for this is, however, that the specifications in accordance with ➤ Table 5 are observed.

 
 

Design of the shaft/raceway

Produce the raceway as a rolling bearing
Ready-to-fit machine element, often defined in standards, for transmitting movements, loads and tilting moments with a high level of efficiency; rolling bearings consist of rolling elements, cages and raceways on rings, guideways or carriages as well as lubricant and, if necessary, seals and accessories
raceway

 

Drawn cup roller clutches HF/HFL are usually used without an inner ring. In order to guarantee correct functioning of the drawn cup roller clutches, the raceway for the rolling elements on the shaft must be produced as a rolling bearing
Ready-to-fit machine element, often defined in standards, for transmitting movements, loads and tilting moments with a high level of efficiency; rolling bearings consist of rolling elements, cages and raceways on rings, guideways or carriages as well as lubricant and, if necessary, seals and accessories
raceway (hardened and ground). The surface hardness
Resistance of a body to indentation by another body; hardness is either intrinsic or is achieved by heat treatment processes (steel) and/or thermochemical diffusion; for rolling bearings, hardness is measured in Rockwell (HRC) or Vickers (HV)
of the raceways must be 670 HV to 840 HV, the case hardening depth CHD must be sufficiently large (CHD ≧ 0,3 mm). Design of raceways ➤ Table 7. If the shaft cannot be produced as a raceway, the bearings can be combined with inner rings IR or LR.

 

Provide lead chamfer on the shaft

 

For the bearings to be mounted without damage, the shaft must have a lead chamfer of 10° to 15° with a width of approx. 1 mm.

 
   
Table 7
Design of shaft
 

Series
Springs
Shaft
Tolerance class1)
Roundness tolerance
Parallelism tolerance
Recommended mean roughness
Regular or irregular repeat deviation from an ideal geometric profile.
value
Ramax (Rzmax)
max.
max.
μm
HF, HFL
Steel
h5 (h6)2)
IT3
IT3
0,4 (2)
HF..-KF, HFL..-KF
Plastic
h8
HF..-R, HFL..-R
Steel
h5 (h6)2)
HF..-KF-R, HFL..-KF-R
Plastic
h8
HFL0606-KF-R,
HFL0806-KF-R
Plastic
h9

 
 
______
 1    The envelope requirement Ⓔ applies.
 
 
 2    The values in brackets can be used if the actual torque is no more than 50% of the permissible torque Md per.
 
 

Mounting and dismounting

 
imageref_17757187211_All.gif   Protect drawn cup roller clutches against dust, dirt and moisture; contaminants can impair the function and operating life
See Life, rating
of roller clutches. Pressing-in forces must never be directed through the rolling elements. Drawn cup roller clutches must not be tilted during pressing-in, as this may damage
Loss of essential or required characteristics in equipment, machinery or plant or their component parts.
the needle rollers
Cylindrical rolling elements with a high length/diameter ratio (DIN 5402 Part 3)
and raceways.
 

Retention for transport

 

Drawn cup roller clutches are normally packed individually in the case of small quantities. Where larger quantities are involved, drawn cup roller clutches are placed in a specific orientation in blister packaging and delivered in this form. The blister packaging then serves to retain the parts in position during transport.

 

Removing the drawn cup roller clutches from the packaging

 

Drawn cup roller clutches should only be removed from their original packaging immediately before assembly. If roller clutches are removed from a batch packaged with dry preservative, the package must be closed again immediately. The protective vapour phase can be maintained only in the closed package. Ungreased drawn cup roller clutches are coated with a preservative. Lubrication
Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.

See
Lubrication method
Lubrication condition
Recirculating lubrication
Lubrication technology
One-off lubrication
Hydrodynamic lubrication
Lubricant change intervall
Lubricant change
Lubricant
Lubricant paste
Oil
Grease
Lubrication film
Lubrication system
with oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
must take place after pressing-in, in accordance with the specifications.

 
 

Drawn cup roller clutches should be stored:

 
 
  • in dry, clean rooms with the room temperature as constant as possible
  • at a relative humidity of max. 65%.
 

Storage period

 

The storage period for greased drawn cup roller clutches is limited by the shelf life
The basic rating life is the life reached or exceeded by 90% of a sufficiently large group of apparently identical bearings before the first evidence of material fatigue develops
of the lubricating grease.

 

Mounting using a fitting mandrel

 

Drawn cup roller clutches should only be pressed into the locating bore using a special fitting mandrel. Attention must be paid to the clamping direction of the roller clutch. The clamping direction is indicated by an arrow on the end face of the drawn cup.

 
 

The drawn cup roller clutch clamps if it is rotated in the direction of the arrow.

 
 

Functional inspection

Clutches without knurling

 

The function of these roller clutches is checked in a housing
See Mounting dimenstions
with the mini­mum wall thickness determined according to ➤ Figure 9 or thicker. The housing
See Mounting dimenstions
bore and shaft tolerances
See
Running accuracy
Dimensional accuracy
must be observed ➤ Table 5 and ➤ Table 7.

 

Clutches with knurling

 

The function of these clutches is checked before they are pressed in. In this case, the inspection
Control and assessment of lubrication and friction points on equipment and machines.
criteria are the clamping effect and idling.

 
imageref_18348417035_All.gif   For any questions relating to the mounting of drawn cup roller clutches, please consult Schaeffler.  
 

Schaeffler Mounting Handbook

Drawn cup roller clutches must be handled with great care

 

In order that drawn cup roller clutches can function correctly and achieve the envisaged operating life
See Life, rating
without detrimental effect, they must be handled with care.

 
imageref_21602891659_en.gif   The Schaeffler Mounting Handbook MH 1 gives comprehensive infor­mation about the correct storage, mounting, dismounting and mainten­ance of rotary rolling bearings http://www.schaeffler.de/std/1D53. It also provides information which should be observed by the designer, in relation to the mounting, dismounting and maintenance
Inspection, maintenance and repair of equipment and machines.
of bearings, in the original design of the bearing position. This book is available from Schaeffler on request.
 
 

Legal notice regarding data freshness

 

The further development of products may also result in technical changes to catalogue products

 

Of central interest to Schaeffler is the further development and opti­misation of its products and the satisfaction of its customers. In order that you, as the customer, can keep yourself optimally informed about the progress that is being made here and with regard to the current technical status of the products, we publish any product changes which differ from the printed version in our electronic product catalogue.

 
imageref_18350433803_All.gif   We therefore reserve the right to make changes to the data and illus­trations in this catalogue. This catalogue reflects the status at the time of printing. More recent publications released by us (as printed or digital media) will automatically precede this catalogue if they involve the same subject. Therefore, please always use our electronic product catalogue to check whether more up-to-date information or modification notices exist for your desired product.  
   
  
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