WO2016086925A1

WO2016086925A1 - Coupling release bearing arrangement

Info

Publication number: WO2016086925A1
Application number: PCT/DE2015/200456
Authority: WO
Inventors: Shankar Jarag; Abhijeet Deshpande
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2014-12-01
Filing date: 2015-09-09
Publication date: 2016-06-09
Also published as: DE102014224518B4; DE102014224518A1

Abstract

The invention relates to a coupling release bearing arrangement comprising a housing (1) for receiving a bearing ring of a coupling release bearing through which a bore (3) completely passes, comprising a sleeve (4) which extends through the bore (3) in order to allow an axial movement of the housing (1) relative to the sleeve (4), and comprising a plurality of grooves (5) which correspond to the axial length of the bore (3) and each of which has two axial ends (6) and extend into the housing (1) that surrounds the bore (3) in a radial manner relative to the central axis ZA of the bore (3). The aim of the invention is to improve such a coupling release bearing arrangement. This is achieved in that the axial groove (5) ends (6) which extend out of the housing (1) are formed in a closed manner, thereby allowing the closed grooves (5) to be filled with a lubricant (11) without the risk of the lubricant exiting between the sleeve (4) and the housing (1).

Description

description

Clutch Release Bearing Assembly Technical Field

The invention relates to a Kupplungsausrücklageranordnung, in particular to a clutch release bearing assembly, in which the belonging to this arrangement Kupplungsausrücklagergehäuse - in the following only housing - permanently low friction on a housing penetrating sleeve slides.

From DE 2240383 it is known for the operation of shift disconnect couplings to provide so-called clutch release bearing. These clutch release bearings are essentially formed by an inner and an outer bearing ring. Wrong annular space between the coaxial with each other arranged bearing rings roll rolling on provided by the bearing races raceways. Depending on the design of the clutch release bearing, either the outer or inner bearing ring is in operative connection with spring tongues of a shift disconnect clutch. If, as illustrated for example in DE 2240383, the inner bearing ring is the one which is in operative connection with the spring tongues of a shift disconnect clutch, the outer bearing ring forms the so-called stationary bearing ring. The respective stationary bearing ring is rotatably mounted on a housing. To separate the gearshift clutch, it is necessary to move the two bearing rings together with the housing axially. For this purpose, a bore is provided in the housing, which completely passes through them in the axial direction. To guide the housing, a sleeve is provided, which is arranged stationary and penetrates the bore of the housing. When the shift disconnect clutch is actuated, a force is exerted on the housing and the housing, together with the bearing rings and the rolling elements, is axially displaced, whereby the bore slides on the sleeve. To reduce friction losses between bore and sleeve "it is generally known either to coat the inner casing of the bore or the outer casing with a layer of lubricant or to lubricate this sliding seat by applying a lubricant. Compared with the service life of a power tool in which such a clutch release assembly is used, these friction reduction measures are more likely to have a short-term effect. Due to the relative movement of the housing and bore an applied layer of lubricant is abraded very quickly or used lubricant between the bore and sleeve discharged from the area to be lubricated by either at the ends of the displacement on the sleeve or at the edges of the bore lubricant beads form.

In addition to the smooth-walled design of the bore, it is also known to minimize the physical contact between these two components to reduce the friction between the sleeve and the bore. Thus, it is known from EP 2101073, which at the same time forms the closest prior art, to provide the bore with a plurality of slots corresponding to the axial length of the bore, which radially extend into the housing surrounding the bore with respect to the center axis of the bore , To further reduce friction, the grooves may be filled with shearing material, but the lubricant discharge from the clutch release bearing only very limitedly reduced because of the limited holding action of the grooves for the lubricant. Object of the invention

The invention is therefore an object of the invention to provide a Kupplungsausrücklager- arrangement, in softer a lubricant is held long-term stable between the bore and the sleeve.

Presentation of the invention This object is achieved with the features specified in claim 1. Advantageous embodiments and further developments of the invention are specified in claims 2 to 9. Before going into details, it should be noted that the sleeve does not necessarily have to be hollow, but may be for a while, running through the bore in the housing.

The starting point for the invention was. According to the findings of the Applicant, this is achieved by the fact that the effect of a lubricant supply introduced during the production of clutch release bearings for friction reduction between the bore and sleeve as long as possible or suppress discharges of lubricant during operation of a clutch release bearing introduced lubricant is encapsulated within the grooves by the cooperation with the sleeve, in which the axial ends of the grooves are formed sealed. The fact that the discharge of lubricant by closing the axial ends is much more difficult, the lubricant is also much longer obtained between the grooves and can thus contribute much longer to reduce friction between the sleeve and bore. This improved retention of lubricant between the grooves also causes the clutch release bearing to remain substantially cleaner due to the significantly reduced lubricant discharge. A very simple and sustainable closing of the axial ends of the grooves is given when the grooves, where they emerge from the housing, are covered by a circular disk, which rests against the respective end face of the housing. The storage is reduced when the axial ends of the grooves are closed by means of inserts placed in the grooves. Due to the fact that the inserts are not connected to each other, they can also be used with the same inserts. Closing of housings whose bore diameter is different. It is also ensured by the inserts and their complete engagement in the grooves that no additional -axialer- space for closing the grooves must be provided by this way of closing the axial ends of the grooves.

The manufacture and assembly of inserts is further simplified if the various inserts are connected to each other at least until they are inserted into the grooves by means of a tear-off edge. By this training, a variety of inserts can be made in the form of straps and so easily fed to the respective site.

The flexibility in the selection of lubricants is increased when a formed by the closure of the axial ends of the groove pocket is divided by the use of spacers in at least three pockets sections. So it is conceivable that the respective pocket sections are filled with different lubricants or that at least one pocket portion is free of lubricant. In the latter case, the lubricant-free pocket section can be used as an expansion space for lubricant, with which the pocket sections are filled, which adjoin the lubricant-free pocket section. The fact that the lubricant can expand into the lubricant-free Taschenabschnite not only contributes to the cleanliness of the clutch release bearing, but the lubricant is held within the longitudinal extent of the bore.

The design is further simplified if the respective components, which close the axial ends of the grooves and / or subdivide the pockets into further pocket portions, are positively or frictionally connected to the housing.

A good lubricating effect is given when at least one of the pockets formed is filled with a lubricant per groove. The sealing effect is improved if the respective axially outermost pocket sections of each groove are free of lubricant. In this case, leaking lubricant then enters the empty pocket sections from pocket sections filled with lubricant and is not lost for further lubrication of the sleeve-to-bore section.

The sealing effect is further increased and the cleanliness of the clutch release bearing arrangement is increased if sealing pads are inserted into the respective axially outermost pockets of each groove.

A complicated closing of the axial end of the grooves or an insertion of spacers is omitted if the housing, the inserts and / or spacers form an integrally manufactured unit.

Brief description of the figures

1 is a perspective view of a housing of a clutch release bearing;

2 shows a section through a unit of sleeve and housing along the center axis.

FIGS. 3a to 3c each show a view from the center axis onto the housing; and

4 shows a further embodiment of a housing.

Ways to carry out the invention In Fig. 1, a housing 1 of a Kupplungsausrückiages is shown. This housing 1 is made of plastic and essentially comprises a flange 2 for engaging and receiving a not shown bearing ring of the clutch release bearing and a bore 3, which completely passes through the housing 1.

This bore 3 is penetrated by a sleeve 4, when the housing 1 is mounted later. These relationships are illustrated in FIG. This combination of housing 1 and sleeve 4 allows the housing 1 to be displaced axially with respect to the stationarily arranged sleeve 4, in order to bring about a separation or a closing of the coupling.

As the illustration of FIG. 1 can be removed, the bore 3 is provided with a plurality of grooves 5, which radially engage, starting from the center axis ZA in the housing 1 and i.ü. pull through the hole 3 in the direction of the center axis ZA. The respective axial ends 6 of the grooves 5 are closed with inserts 7, which are inserted into the grooves 5 frictionally. The latter is shown in FIG. 3a.

Another closure of the axial ends 6 of the grooves 5 is shown in Fig. 3b. There is a circular disk 8 is applied to the end face 9 of the housing 1 and connected to this to reduce the assembly work. Finally, the axial ends 6 of the grooves 5 can also be closed by the fact that the inserts 7 shown in FIG. 3 a are made in one piece together with the remaining housing 1. Such a closure of grooves 5 made integrally with the housing is shown in FIG. 3c. If the axial ends 6 of the grooves 5 are closed in accordance with the illustrations of FIGS. 3a to 3c, pockets 10 are provided which lent to the center axis ZA are open and which are filled to reduce the friction between the housing 1 and sleeve 4 with lubricant 11.

To reduce contamination of the clutch release bearing by leaking lubricant 11 from the grooves 5 on or completely exclude, in Fig. 4 shows an embodiment of the housing 1, in which the pockets 10, which of the in the sense of Fig. 3a to 3c be provided at their axial ends 6 closed grooves 5, are divided by the use of two spacers 12 per groove 5 in a total of three pocket portions 10a, 10b and 10c. The good sealing effect of this arrangement is based on the fact that only the central pocket portion 10b are filled with lubricant 11, while the two outer pockets 10a, 10c remain unfilled. Moves the housing 1 for actuating the clutch (not shown) as already explained in connection with Fig. 3 in the axial direction on the sleeve 4, then from the central pocket portion 10b leaking lubricant 11 of the middle portion of each pocket portion 10b adjacent pocket portions 10a 10c, without lubricant 11 leaving the unit of housing 1 and sleeve 4. If the cleanliness of the unit of the housing and sleeve 4 are further increased, the respective outer pockets 10a, 10c can also be provided with pichtungspads 13 which bind from the pocket 10b leaking lubricant 11 and / or together with the sleeve 4 a touching Forming a seal. These relationships are illustrated in Fig. 4 below the central axis ZA. LIST OF REFERENCE NUMBERS

1 housing

2 flange

3 hole

4 sleeve

5 groove

6 axial ends

7 inserts

8 circular ring

θ end face

10 bags

10a-c pocket sections

11 lubricant

12 spacers

13 sealing pad

Claims

Claims 1. Kupplungsausrücklageranordnung with a housing 1 for receiving a bearing ring of a clutch release bearing, which is completely traversed by a bore 3, with a sleeve 4 which penetrates to an axial displaceability of the housing 1 relative to the sleeve 4, the bore 3, and with a plurality of the axial Length of the bore 3 corresponding grooves 5, each having two axial ends 6 and which extend relative to the center axis ZA of the bore 3 radially into the surrounding the bore 3 housing 1, characterized in that the axial ends 6 of the grooves 5, with which these emerge from the housing 1, are formed closed.

2. Kupplungsausrücklageranordnung according to claim 1, characterized in that the axial ends 6 of the grooves 6 are each closed by a circular disk 8, wherein for closing the grooves 5 each of the annular disks 8 rests against an end face 9 of the housing 1.

3. clutch release bearing assembly according to claim 1 characterized in that 5 inserts 7 are inserted into the grooves 5 for closing the axial ends 6 of the grooves.

4. Kupplungsausrücklageranordnung according to one of claims 1 to 3, characterized in that a formed by the closure of the axial ends 6 of each groove 5 and only in the direction of the center axis ZA of the bore 3 open pocket 10 through the use of spacers 12 in at least three pocket portions 10 a , 10b, 10c.

5. Kupplungsausrücklageranordnung according to claim 2 or 3, characterized in that the respective components 7, 8, 12, which close the axial ends 6 of the grooves 5 and / or the pocket 10 in pocket sections 10 a, 10 b 10 c, with the housing form or are frictionally connected.

6. clutch release bearing assembly according to one of claims 1 to 5, characterized in that per groove 5 at least the pocket formed 10 or one of the pocket portions 10 b is filled with a lubricant 11.

7. Kupplungsausrücklageranordnung according to claim 6 as far as this is dependent on claim 4, characterized in that the respective axially outermost pocket portions 10 a, 10 c of each groove 5 are free of lubricant 11.

8. clutch release bearing assembly according to claim 7, characterized in that in the respective axially outermost pocket portions 10 a, 10 c of each groove 5 sealing pads 13 are used.

9. clutch release bearing according to one of claims 2, 3 or 4, characterized in that the housing 1, the inserts 7 and / or the intermediate pieces 12 form an integrally advanced unit.