DE102004034439A1 - Clutch release bearing, comprising particularly stable spacer ring with folded over outer area - Google Patents

Abstract

The clutch release bearing (1) is equipped with a slide bearing (2) comprising a stationary inner ring (4) and a movable outer ring (5). A spacer ring (6), which can be permanently joined, is attached to the outer ring (5). The spacer ring (6) acts in combination with elastic elements (7) extending from a cup spring and is folded over at its outer edge (8), resulting in an increased rigidity without requiring the use of a material of a higher quality.

Description

Territory of invention

The The invention relates to a clutch release bearing on a motor vehicle, with a rolling bearing, which a torsionally rigid inner ring and a circumferential outer ring having, wherein the outer ring a with the same firmly connectable and with spring tongues of a diaphragm spring the coupling operatively contact ring is assigned.

background the invention

For an economic Production of release bearings It is beneficial to the main components of existing bearings for different ones use cases to be able to use. This includes also the desire to have such major components in terms of the current required pressure diameter in their scope to expand.

So is sought, both release bearing with low pressure diameter as well as release bearing whose pressure diameter over the Collar diameter "D" on the outer ring enough, cost-effective and without complicated conversion or redesign.

A generic clutch release bearing whose pressure diameter or diameter of the stop ring is greater than or equal to the collar diameter "D" is selected from the EP 0 892 188 B1 known, wherein the stop ring, here referred to as pressure ring, is made of sheet metal.

Provided the pressure diameter of the spring tongues of a plate spring the Coupling of actively connected stop ring over the collar diameter "D" on the outer ring is enough, is known to be the same by the axial forces generated by the spring tongues considerably higher Bending stresses exposed as with printing diameters, the smaller the collar diameter "D" of the outer ring are selected. Due to the said increased Bending stress is in this prior art, the material thickness of the used sheets for the starting ring chosen relatively large, from which Although an increased Flexural rigidity, however, also results in increased weight.

Task of invention

Of the Invention is based on the object, an improved clutch release bearing to create, which while keeping the main components simple and cost-effective can be adapted to currently required pressure diameters and the respective requirements, in particular the requirements of the selected thrust ring with regard to on whose rigidity and strength is fair.

Solution of task

Of the Invention is based on the finding that it is necessary for the solution of Task is sufficient, in particular the run-up in a suitable Way to the respectively desired Adjust the pressure diameter and firmly connect with the outer ring.

The Asked task is according to the features of the main claim through a clutch release bearing with a rolling bearing, which has a torsionally rigid inner ring and a circumferential outer ring having, wherein the outer ring one with the same firmly connectable and with spring tongues of a diaphragm spring the coupling operatively contact ring is assigned. In addition is provided that the stop ring starting from a sufficient material thickness for small Pressure diameter by a special design and / or choice of materials without substantial increase the material thickness one such increased Stiffness and strength has that for pressure diameter can be used, which is larger or equal to the collar diameter "D" on the outer ring chosen are.

The under claims describe preferred developments or refinements of Invention.

After that is according to one first preferred embodiment provided that the stop ring is formed of a steel sheet and at least radially outside the collar diameter "D" of the outer ring to achieve the increased Stiffness and strength has a duplication.

By This measure is in maintaining a low material thickness in the particular bending stressed area of the stop ring with low mechanical engineering Effort in an advantageous manner, the increased rigidity and strength of the same achievable.

The Duplication is characterized by a radially outward to radially inward to the Collar diameter "D" of the outer ring recirculated edge section formed of the steel sheet, to which a parked Axialsteg followed.

to Radial centering of the stop ring is provided that this by means of said axial web on the collar diameter "D" of the outer ring supported.

Of Furthermore, it is preferably provided that the thrust ring to prevent rotation has radially inside one or more angled locking tabs, in turn, on the inner diameter of the outer ring, in prepared recesses of the same penetrating, latch. The locking lugs can insofar Also be designed angled so that at the same time a axial fixation of the stop ring is realized on the outer ring.

Is possible it also, that the thrust ring over molded Grooves of the axial web, in which the end portion of an outer ring supporting sealing cap form-fitting engages, is axially fixed. It may also be appropriate that the thrust ring for axial fixation in prepared grooves of the outer ring form-fitting intervenes.

Farther includes the invention a, the thrust ring of a thermoformable tool steel, preferably C 80 U, or from a deep-drawable tempering steel, in particular C 45, Cf 53, C 75 whose material properties to be particularly advantageous for have proved the application in question.

to increase the wear resistance of the Anlaufrings this may be formed heat treated in a suitable manner and / or he can while reducing the frictional resistance at least in the contact area with the spring tongues of the diaphragm spring the coupling a coating of a hard material or from a Plastic have.

The Hard material coating is preferably by a DLC coating (DLC diamond-like-carbon) formed, resulting in extensive experiments has proven to be particularly advantageous, but can also each other suitable per se known hard coating application Find.

When Plastic coating in particular has a highly wear-resistant and low-friction plastic, preferably plastics, such as PA 46; CF 30; PTFE 5 o. Ä. Use Find. In this case, the plastic coating can be both by overmolding the stop ring as well as by positive and / or non-positive connection of a separate made of plastic ring part formed on the thrust ring.

A second preferred embodiment of Anlaufrings provides that the thrust ring by a prefabricated Molded part made of plastic or ceramic is formed. By this measure can easy and inexpensive Any design of the stop ring can be realized.

to Achieving an increased Stiffness and strength of the plastic molding is proposed to provide suitable friction-reducing material admixtures.

Further It is proposed that the plastic stop ring be in the form of the prefabricated molding by means of a plurality of uniformly over the Scope distributed and in corresponding recesses on the inner diameter of the outer ring and / or non-positively engaging connecting webs is fixed to the outer ring.

Further the stop ring can also be used exclusively or in combination with the above positive and / or non-positive connection by means of a high temperature resistant Adhesive on the outer ring be attached, being for Circlip rings made of ceramic due to the brittleness of the material in the essentially exclusively the glue is to be used.

As the invention also provides, the start-up contour of the run-up ring or its coating dependent on from the formation of the spring tongues (curved or straight) vertically directed to the coupling axis or be spherically curved, which also advantageous friction and thus also wear-reducing effect.

In Further development of the invention is also proposed that the Thrust ring means for sealing the clutch release bearing assigned. This means for sealing can on the one hand a fixed to the inner diameter of the stop ring elastomeric seal be formed with a torsionally stiff and on a radial supporting ring lying inside Seal of clutch release bearing causes a sliding seal.

To the another means of sealing can also be achieved by an internal seal Anlaufringabschnitt be formed of the stop ring, which is such that is formed together with a torso and up a radially inner retaining ring supporting angular ring of the clutch release bearing an axial labyrinth seal is effected.

Short description the drawing

The The invention will be described below with reference to the accompanying drawings on some embodiments explained in more detail. In this shows

1 the axial section of an inventively designed clutch release bearing according to a first preferred embodiment (variant 1),

2 a second embodiment variant of the clutch release bearing according to 1 .

3 a third embodiment variant of the clutch release bearing according to 1 .

4 a fourth embodiment variant of the clutch release bearing according to 1 .

5 the view "A" according to 4 .

6 the axial section of an inventively designed clutch release bearing according to a second preferred embodiment (variant 1),

7 the view "B" according to 6 .

8th the section "II" according to 7 .

9 a second embodiment variant of the clutch release bearing according to 6 .

10 the section "II-II" according to 9 .

11 a further advantageous embodiment of the clutch release bearing, shown by way of example on the embodiment variant thereof according to 4 , and

12 Another advantageous design of the clutch release bearing.

Full Description of the drawing

This in 1 shown inventive clutch release bearing 1 is in a conventional manner with a rolling bearing 2 provided, which a torsionally rigid and with an actuator 3 connected inner ring 4 and a circumferential outer ring 5 having.

The actuating device 3 encloses a drive shaft, not shown, and is axially displaceable for engagement and disengagement.

Radial outward supports itself on the outer ring 5 a so-called stop ring 6 off, in turn, with spring tongues 7 the diaphragm spring of the clutch, not shown in detail is non-positively operatively connected.

This arrangement causes both the outer ring 5 as well as the stop ring 6 connected circumferentially with the coupling.

As 1 can be seen further, has the stop ring 6 over a pressure diameter that is greater than or equal to the collar diameter "D" on the outer ring 5 is selected.

According to the invention, the stop ring 6 now starting from a sufficient material thickness for small diameters by a special design, such increased rigidity and strength, that without substantial increase in material thickness the same for said pressure diameter, greater than or equal to the collar diameter "D" on the outer ring 5 is selected, can be used.

This is a clutch release bearing 1 created, whose stop ring 6 For both small and large print diameter has a largely uniform material thickness.

The present is the stop ring 6 formed from a steel sheet, which receives its simple shape and cost by its special shape such that it is at least radially outside of the collar diameter "D" of the outer ring 5 a duplication 8th having.

This duplication 8th is here by a radially outward to radially inward outer ring side to the collar diameter "D" of the outer ring 5 returned or bent edge portion 9 formed, at which a parked Axialsteg 10 followed.

Thus, as already explained above, while maintaining a low material thickness of the thrust ring 6 only by the duplication 8th as well as the process resulting hardening of the material in the realized bending section the increased rigidity and strength in the particularly stressed on bending region of the stop ring 6 accomplished.

Due to this surprisingly simple measure, according to the object, a clutch release bearing 1 be provided, which while maintaining the main components mentioned cost and quickly adaptable to currently required pressure diameter by only appropriately designed stop rings 6 need to be maintained, the case of application, if necessary, each with the outer ring 5 of the clutch release bearing 1 firmly connected.

1 further shows a start-up contour 11 of the stop ring 6 , which in turn is spherically curved and in particular for straight spring tongues 7 suitable.

However, the invention also includes a start-up contour formed perpendicular to the coupling axis 11 , on which are known curved trained spring tongues 7 can support (not shown), as effectively the beneficial effect of duplication 8th ge is used.

The above-mentioned Axialsteg 10 in turn, when assembled, supports itself on the collar diameter "D" of the outer ring 5 from, whereby advantageously a radial centering is realized.

To a relative rotation between the outer ring 5 and the stop ring 6 To prevent, points the stop ring 6 according to 1 one or more angled locking tabs 12 on, in turn, on the inner diameter of the outer ring 5 , in prepared corresponding recesses 13 of the same penetrating, latch.

The locking tabs 12 can also be angled so that at the same time an axial fixation of the stop ring 6 on the outer ring 5 is realized ( 3 ).

Other possible ways to realize an axial fixation of the stop ring 6 on the outer ring 5 are 1 and 2 to take, according to 1 the stop ring 6 via radially externally molded grooves 14 of the axial bridge 10 has, in which the axial end portion 15 one on the outer ring 5 supporting, known per se sealing cap 16 engages positively by, for example, said end portion 15 the sealing cap 16 is crimped during the completion.

According to the in 2 illustrated embodiment, however, the end portion of the axial web engages 10 by springy locking form-fitting in molded grooves 17 of the outer ring 5 one.

After a technically equivalent measure, the end portion of the axial web 10 but also by a beading in the molded grooves 17 of the outer ring 5 interlock positively, and it is certainly recommended, in this case, the end portion of the axial web 10 by starting "soft" (not shown).

The stop ring 6 consists in turn of a thermoformable tool steel, or a deep-drawable tempering steel. These steels have material properties which have proved advantageous for the application in question.

To increase the wear resistance, this can be achieved by a known heat treatment at least in the region of the starting contour 11 or in the contact area with the spring tongues 7 undergo at least one surface hardening, laser surface hardening or induction hardening methods being particularly suitable.

Likewise, it may also be appropriate to have a separate coating 18 made of a hard material or a plastic on said contact area of the stop ring 6 to raise 4 . 11 ). Thus, it has proved to be advantageous to form the hard material coating by means of a DLC coating (DLC-diamond-like-carbon) or another hard material coating known per se.

What As far as the plastic coating is concerned, this is due to a highly wear-resistant and low-friction plastic, with materials, like PA46, CF30, PTFE5 or similar especially proven to have.

It has proven particularly expedient to use the coating 18 in the form of a plastic coating by encapsulation of the stop ring 6 to train ( 4 ). Here is the stop ring 6 , in turn, now a so-called support ring or a reinforcement for the coating 18 made of plastic, starting from its bore with radially extending slots 19 with embossed slot walls 20 provided, which does not hinder a radial expansion of the plastic due to a temperature change due to the different expansion coefficients between plastic and steel or ensure such.

Furthermore, as shown in FIG 4 also a recess 21 in the starting ring 6 be provided, which when encapsulating with plastic 18 kept free by a corresponding tool insert and also advantageously allows a tension-free expansion of the plastic during temperature changes.

The 5 shows in section A by way of example the design of the slots 19 in the stop ring 6 without overmoulding with plastic.

As an alternative to the above embodiment variant, there is also the possibility of the plastic coating 18 of the stop ring 6 to form by a separately manufactured plastic ring part, which positively and / or non-positively with the stop ring 6 to connect 11 ).

The positive retention of the coating 18 in the form of the plastic ring part can separately manufactured plastic thrust washers, for example by embossing protruding plastic webs, which in the already described above slots 19 of the stop ring 6 intervene, be achieved.

The above embodiment focuses on a thrust ring 6 made of steel, which in turn to increase the wear resistance with a Beschich tung 18 may be provided and positive and / or non-positive with the outer ring 5 is connectable.

In contrast, it may also be indicated and is covered by the invention, the thrust ring 6 be formed by a prefabricated molding made of plastic or ceramic, preferably thermosets or industrial ceramics are used. In order to achieve the increased rigidity and strength, in particular of the molded part made of plastic, it is proposed to provide friction-reducing material admixtures which are known per se and are therefore not to be mentioned in more detail here.

The 6 to 10 show such made of plastic or ceramic run-rings 6 , wherein the same are shown here with a variety of printing diameters (small print diameter drawn with a solid line, large print diameter drawn with a dashed line).

Furthermore, the figures, in particular the 6 and 9 , the freely selectable start-up contour 11 for curved or straight spring tongues 7 to remove, so that the start-up contour 11 both directed perpendicular to the coupling axis and may be formed spherically curved.

According to 6 and 8th has the stop ring 6 plastic a plurality of uniformly distributed over the circumference and in corresponding recesses 22 at the inner diameter of the outer ring 5 positively engaging connecting webs 23 which in turn fixes the stop ring 6 on the outer ring 5 by imprinting them.

Another suitable measure for fixing the stop ring 6 made of plastic on the outer ring 5 is the 9 and 10 can be seen, in which case the connecting webs 23 were elastically formed in limits and positive and non-positive by means of locking lugs 24 in the recesses mentioned 22 intervention.

It is also possible that the stop ring 6 by means of a high temperature resistant and known per se adhesive on the outer ring 5 is attached, this method of joining for thrust rings 6 made of ceramic because of its brittleness preferred application.

As the 11 and 12 can further show the stop ring 6 a means 25 be assigned to seal the clutch release bearing against oil leakage. Based on the design variant of the clutch release bearing according to 4 is according to 11 the said means 25 for sealing by a at the inner diameter of the stop ring 6 firmly arranged elastomeric seal formed.

The elastomer seal in turn causes a torsionally rigid and on a radially inner retaining ring 26 supporting gasket 27 of the clutch release bearing 1 a grinding seal.

12 on the other hand shows a starting ring 6 made of plastic or ceramic, which in turn on the outer ring 5 is glued on.

The middle 25 for sealing is in this case by an inner run-up ring section 28 of the stop ring 6 formed, which according to the invention is designed such that, together with a torsionally rigid and on a radially inner retaining ring 26 supporting angle ring 29 the clutch release bearing an axial labyrinth seal is realized.

The on the retaining ring 26 Pressed angle ring 29 also offers the advantage that the biasing forces of the disc spring and thus the radial displacement force for the inner ring 4 can be kept within a narrow tolerance range.

1

Clutch

2

roller bearing

3

actuator

4

inner ring

5

outer ring

6

thrust ring

7

spring tongue

8th

duplication

9

edge section

10

axial web

11

start contour

12

locking tabs

13

recesses

14

groove

15

end

16

sealing cap

17

groove

18

coating

19

slots

20

Diaphragm walls

21

recess

22

recess

23

connecting webs

24

locking lugs

25

medium for sealing

26

retaining ring

27

sealing washer

28

Thrust ring section

29

angle ring

D

Collar diameter on the outer ring 5

Claims (21)

Clutch release bearing ( 1 ) on a motor vehicle, with a rolling bearing ( 2 ), which has a torsionally rigid inner ring ( 4 ) and a circumferential outer ring ( 5 ), wherein the outer ring ( 5 ) one with the same firmly connectable and with spring tongues ( 7 ) a plate spring of the coupling operatively engageable contact ring ( 6 ), characterized in that the stop ring ( 6 ) starting from a sufficient material thickness for small pressure diameters by a special design and / or material selection without substantial increase in the material thickness such increased rigidity and strength that this is used for pressure diameter greater than or equal to the collar diameter "D" on the outer ring ( 5 ) are selected. Clutch release bearing according to claim 1, characterized in that the thrust ring ( 6 ) is formed from a steel sheet and at least radially outside of the collar diameter "D" of the outer ring ( 5 ) to achieve the increased rigidity and strength a doubling ( 8th ) having. Clutch release bearing according to claim 2, characterized in that the duplication ( 8th ) by a radially outward radially inward to the collar diameter "D" of the outer ring ( 5 ) returned edge portion ( 9 ) of the steel sheet is formed, at which a parked axial web ( 10 ). Clutch release bearing according to claim 3, characterized in that for the radial centering of the thrust ring ( 6 ) this by means of the axial web ( 10 ) on the collar diameter "D" of the outer ring ( 5 ) is supported. Clutch release bearing according to one of claims 2 to 4, characterized in that the thrust ring ( 6 ) for preventing rotation radially inward one or more angled locking tabs ( 12 ), which in turn on the inner diameter of the outer ring ( 5 ) in prepared recesses ( 13 ) engage the same penetrating. Clutch release bearing according to claim 5, characterized in that the locking lugs ( 12 ) are formed angled so that at the same time an axial fixation of the stop ring ( 6 ) on the outer ring ( 5 ) is realized. Clutch release bearing according to one of claims 2 to 6, characterized in that the thrust ring ( 6 ) via molded grooves ( 14 ) of the axial web ( 10 ) into which the end region ( 15 ) one on the outer ring ( 5 ) supporting sealing cap ( 16 ) engages positively, axially fixed. Clutch release bearing according to one of claims 2 to 6, characterized in that the thrust ring ( 6 ) for axial fixation in prepared grooves of the outer ring ( 17 ) engages positively. Clutch release bearing according to one of claims 2 to 8, characterized in that as material for the thrust ring ( 6 ) preferably a deep-drawable tempering steel such as: C 45; Cf 53; C 75 or a deep-drawing tool steel, such as: C 80 U is used. Clutch release bearing according to one of claims 2 to 9, characterized in that the thrust ring ( 6 ) is heat treated to increase the wear resistance and / or while reducing the frictional resistance at least in the contact area with the spring tongues ( 7 ) the plate spring of the coupling a coating ( 18 ) comprises a hard material or a plastic. Clutch according to claim 10, characterized in that the hard material coating by a DLC coating (DLC-diamond-like-carbon) or another suitable hard coating is formed. Clutch according to claim 10, characterized in that the plastic coating through a highly wear-resistant and low-friction plastic, preferably PA46, CF30, PTFE5 o. Ä. Formed is. Clutch release bearing according to one of claims 10 and 12, characterized in that the plastic coating by encapsulation of the thrust ring ( 6 ) or by positive and / or non-positive connection of a separately produced plastic ring part on the thrust ring ( 6 ) is formed. Clutch release bearing according to claim 1, characterized in that the thrust ring ( 6 ) is formed by a prefabricated molding made of plastic or ceramic. Clutch according to claim 14, characterized in that to achieve the increased Rigidity and strength of the molded plastic friction-reducing Material admixtures has. Clutch release bearing according to one of claims 14 and 15, characterized in that the thrust ring ( 6 ) made of plastic by means of a plurality of uniformly distributed over the circumference and in corresponding recesses ( 22 ) on the inner diameter of the outer ring ( 5 ) positively and / or non-positively engaging connecting webs ( 23 ) on the outer ring ( 5 ) is fixed. Clutch release bearing according to one of claims 14 to 16, characterized in that the thrust ring ( 6 ) by means of a high-temperature-resistant adhesive on the outer ring ( 5 ) is attached. Clutch release bearing according to one of claims 1 to 17, characterized in that the starting contour ( 11 ) of the stop ring ( 6 ) or its coating ( 18 ) is directed perpendicular to the coupling axis or spherically curved. Clutch release bearing according to one of claims 1 to 18, characterized in that the thrust ring ( 6 ) a means ( 25 ) for sealing the clutch release bearing ( 1 ) assigned. Clutch release bearing according to claim 19, characterized in that the means ( 25 ) for sealing by a at the inner diameter of the stop ring ( 6 ) fixedly arranged elastomeric seal is formed with a torsionally rigid and on a radially inner retaining ring ( 26 ) supporting gasket ( 27 ) of the clutch release bearing ( 1 ) causes a sliding seal. Clutch release bearing according to claim 19, characterized in that the means ( 25 ) for sealing by an inner run-up ring section ( 28 ) of the stop ring ( 6 ) is formed, which is formed such that, together with a torsionally rigid and on a radially inner retaining ring ( 26 ) supporting angular ring ( 29 ) of the clutch release bearing ( 1 ) An axial labyrinth seal is realized.