GB2165323A

GB2165323A - Lining carrier for a clutch disc

Info

Publication number: GB2165323A
Application number: GB08523861A
Authority: GB
Inventors: Alfred Schraut; Helmuth Weissenberger
Original assignee: Fichtel and Sachs AG
Current assignee: ZF Sachs AG
Priority date: 1984-10-05
Filing date: 1985-09-27
Publication date: 1986-04-09
Also published as: GB8523861D0; FR2571457A1; DE3436583A1; IT8567845A0; IT1182590B; BR8504910A; DE3436583C2; FR2571457B1; IT8553908V0; GB2165323B

Abstract

A lining carrier for a friction clutch disc comprises an annular member 1 provided with a reinforcing member 2 stuck on each side thereof, all of the members having aligned windows 6 for torsion spring and the carrier surface between the windows being free from holes etc. within the radial height of the reinforcing members. In alternative embodiments the annular member is secured concentrically around a single reinforcing member which may be generally polygonal, toothed, or welded to the annular member. Torque introduction over a large area or on a large radius renders possible an overall weight reduction of the lining carrier. The lowering of the inertia moment leads to a lower loading of the synchronising devices of the gearings and to greater long- term strength in the connection regions of the annular member and reinforcing part(s). <IMAGE>

Description

SPECIFICATION Lining carrier for a clutch disc The invention relates to a lining carrier for a clutch disc of a motor vehicle clutch comprising a torsional vibration damper.

From German Utility Model No. 1,840,718 a torsional vibration damper is known in which a lining carrier is riveted together with two reinforcing parts radially within the friction linings.

Both the reinforcing parts and the lining carrier in this region have corresponding windows for the reception of the torsion springs. This torsional vibration damper is conceived especially for use in commercial motor vehicles and therefore subject to heavy stresses. The torque introduction from the lining carrier into the region provided with the windows, by way of the rivets, has sometimes led to cracks which started from the windows.

It is therefore the problem of the present invention to achieve a secure introduction of force from the lining carrier to the torsion springs, with the simplest possible means.

In accordance with the invention this problem is solved by the characteristic of the Main Claim. Due to the force introduction into the entire region between a diameter which is larger than the external limitation-of the windows and a diameter which is smaller than the internal limitation of the windows it is possible to generate a more uniform load distribution in this region, whereby stress peaks are avoided.

By way of example it is advantageous here to connect the reinforcing discs with the lining carrier disc by adhesion. Thus in contrast to the prior art the torque introduction is effected not at several closely limited regions but uniformly over a very large region.

It can however also be advantageous to arrange the lining carrier disc and the reinforcing disc in one plane and to effect the connection of the two part through mutual separation zones which are substantially circular in form and lie concentrically with the rotation axis on a diameter at radial distance from the external limitation of the windows. Thus a uniform introduction of the force is possible likewise over a large circumferential region, so that stress peaks cannot occur.

The reinforcing disc can be made wider than the lining carrier and can comprise a collar for the axial fixing of the lining carrier. The force transmission in this case can advantageously be effected by a profiling provided in both parts.

Such a profiling can be made as a polygon with a plurality of straight sections and rounded-off sections arranged therebetween, while axially pushed-on material from the reinforcing part, especially at the ends of the straight contours, produces an axial fixing. The joining together of such components with a polygon as connecting profile can be realised without great expense. Here the corners of the polygon are arranged preferably in the circumferential region between two successive windows. This results in an especially favourable force introduction from the lining carrier into the reinforcing part.

It is however also readily possible to make the connecting profiling as a-fine toothing. In this case the fine toothing can be provided either in both parts or in only one part in which case then it digs itself into the other part on pushing on axially.

A very simple and space-saving connection can be produced in that both parts have a concentric separation zone of annular form which is provided, from the side remote from the collar, with a surrounding weld seam. This formation can take place at a relatively short radial distance from the external contour of the windows and the force introduction is distributed around the entire circumference.

The invention will next be explained in greater detail by reference to various examples of embodiment of lining carriers of motor vehicle friction clutches.

Individually: Figures 1 and 2 show a partial elevation and partial section of a lining carrier with stuck-on reinforcing part; Figures 3, 4 and 5 show a partial elevation and partial sections of an embodiment with a connecting profiling in the form of a polygon; Figures 6 and 7 show a partial elevation and partial section of an embodiment with a fine toothing; Figures 8 and 9 show a partial elevation and partial section of a weided embodiment.

Fig. 1 shows the partial elevation of a lining carrier of annular disc form and Fig. 2 the section ll-ll according to Fig. 1. A lining carrier part 1 of annular disc form comprises openings in its radially outer region for the securing of friction linings (not shown). In its radially inner region it is reinforced from both sides with a reinforcing part 2 of annular disc form on each side, and in this region of the reinforcing parts 2 with the external diameter D, and the internal diameter D2 there are formed corresponding windows 6 for torsion springs. The two reinforcing parts 2 are stuck from the two sides on to the lining carrier part 1. The sticking on of the reinforcing parts in the region provided with the windows 6 results in a very compact style of construction with a uniform introduction of torque into the window region.Since the adhesion is effective over a large area, and thus so is the introduction of the torque from the lining carrier part 1 to the inner region provided with the windows 6, it is possible to make the disc of the lining carrier part 1 as a whole slighter, and to provide its radially outer region with larger apeprtures. Furthermore less components are required. Thus the inertia moment can be re duced, which effects a more favourable gearchange behaviour of the clutch and gearing.

Figs. 3 to 5 show a partial elevation and the sections IV-IV and V-V according to Fig.

3. In this variant of embodiment the lining carrier part 1 a and the reinforcing part 3 are arranged radially one within the other, the reinforcing part 3 having a greater material thickness. The two parts are equipped with complementary torque transmission profilings having the form of a polygon 8. This polygon 8 consists of a plurality of straight section 9 and curved sections 10 arranged therebetween, that is in the corners. Seen in the axial direction, the reinforcing part 3 has a collar 7 which is effective as abutment in the fitting of lining carrier part 1 a and reinforcing part 3 for the lining carrier part la.

In this case such a collar 7 is provided in each case only at some points on the circumference, namely in the regions 10 between the straight sections 9. For the axial fixing of the two parts material 11 is pushed on in each case from the reinforcing part 3 in the end regions of the straight sections 9. This pushed-on material fixes the lining carrier part 1a in the axial direction in relation to the reinforcing part 3 and it penetrates partially into the slight gap between the two polygons 8. In this case the straight sections are arranged in each case approximately radially over the windows 6a on the mean diameter D,.This design results in a very simple assembly of the two parts and a truly uniform torque transmission especially into the regions circumferentially between the individual windows, and the reinforcing part 3 is made homogeneous especially with regard to the window arrangement.

In Figs. 6 and 7, which show the elevation and the section Vll-Vlí of a further form of embodiment, as mutual connection a fine toothing 12 is provided between the lining carrier part 1 b and the reinforcing part 4. This fine toothing 12 extends on a diameter D1 radially outside the external contour of the windows 6b. The toothing 12 can here be made so that both components each have a toothing 12 corresponding with the other, but is is also possible for the toothing 12 to be arranged only in the lining carrier part 1 b and during the operation of pressing on to the reinforcing part 4 to dig itself into this material for the torque transmission.In both cases for axial securing it is provided that opposite to the surrounding collar 7b material pushed on from the material of the reinforcing part 4 is thrown up in several regions 13.

A further variation is represented in Figs. 8 and 9. They show the partial elevation and section IX-IX. In this construction both the lining carrier part 1c and the reinforcing part 5 comprise an annular separation zone 14 corresponding in each case with the counter-part.

This separation zone 14 is arranged on a diameter D, which lies radially outside the external limitation of the windows 6c. For the rotation-fast connection of lining carrier part 1c and reinforcing part 5 by way of this annular separation zone 14 the latter is provided with a surrounding weld seam 15. This weld seam 15 connects the two parts fast in rotation with one another over the entire circumference.

All variants of embodiment comprise firstly a torque transmission effective over a relatively large circumferential region, whereby the local loadings can be greatly reduced. Moreover the torque transmission takes place over a larger diameter compared with the prior art, so that the forces result lower at these points. Thus it is possible to provide larger apertures in the region of the lining carrier part, which effect a weight reduction and a reduction of the inertia moment. Thus by way of example the dynamic forces are reduced which act upon the clutch and likewise the loadings during the gear synchronisation in the gear-change operation.

Claims

1. Lining carrier for a clutch disc of a motor vehicle clutch comprising a torsional vibration damper, having an annular lining carrier disc (1, 1a, 1b, 1c) carrying friction linings in its radially outer region, with at least one reinforcing disc (2, 3, 4, 5) firmly connected with the lining carrier disc (1, la, ic) in the radially inner region of the latter and with axially through-passing windows (6, 6a, 6b, 6c) arranged in the region of the reinforcing disc (2, 3, 4, 5) for the reception of springs of the torsional vibration damper, characterised in that the lining carrier is of one-piece formation at least in the circumferential direction between the windows (6) at every point within the entire radial height of the reinforcing disc (2, 3, 4, 5) and within the entire axial thickness of the lining carrier.

2. Lining carrier according to Claim 1, where each of the reinforcing discs (2) substantially completely overlaps the lining carrier disc (1), characterised in that each of the reinforcing discs (2) is stuck to the lining carrier disc (1) substantially over the entire side area of the reinforcing disc.

3. Lining carrier according to Claim 1, characterised in that the reinforcing disc (3, 4, 5) as such is made in one piece and is thicker than the lining carrier disc, and in that the lining carrier disc (la, ib, 1c) concentrically surrounds the reinforcing disc (3, 4, 5) and is secured with its inner circumference to the external circumference of the reinforcing disc (3, 4, 5).

4. Lining carrier according to Claim 3, characterised in that the lining carrier disc (lea, 1b, 1c) is guided radially on the external circumference of the reinforcing disc (3, 4, 5 and in that the reinforcing disc (3, 4, 5) carries aiong at least a part of its external circumference a radially protruding collar (7, 7b, 7c) which axially fixes the lining carrier disc (1a, 1b, 1c).

5. Lining carrier according to Claim 4, characterised in that the internal circumference of the lining carrier disc (1a, 1b) and the external circumference of the reinforcing disc (3, 4) are provided with mutually complementary, interengaging torque-transmission profilings (8, 12).

6. Lining carrier according to Claim 5, characterised in that the profiling is formed as a polygonal profile (8) the corner regions (10) of which are connected by rectilinear profile sections (9).

7. Lining carrier according to Claim 6, characterised in that the corner regions (10) of the profiling (8) are arranged in the circumferential direction between adjacent windows (6a).

8. Lining carrier according to Claim 7, characterised in that the collar (7) is provided substantially only in the corner regions (10) of the profiling (8).

9. Lining carrier according to one of Claims 5 to 8, characterised in that the reinforcing disc (3, 4) is swaged over on the side of the lining carrier disc (1a, 1b) axially remote from the collar (7b, 7c), for the axial securing of the lining carrier disc (la, 1b).

10. Lining carrier according to Claim 9, characterised in that the profiling is formed as polygonal profile (8) with rectilinear profile sections (9) and in that the reinforcing disc (3) is swaged in the corner regions (10) of the profiling (8).

11. Lining carrier according to Claim 10, characterised in that the corner regions (10) of the profiling (8) are rounded and in that the reinforcing disc (3) is swaged into the rounded corner regions (10) at the transition points (11) of the rectilinear profile sections (9).

12. Lining carrier according to Claim 5, characterised in that the profiling is formed as a fine toothing (12).

13. Lining carrier according to Claim 12, characterised in that the reinforcing disc (4) is swaged over on the side of the lining carrier disc (1c) axially remote from the collar (7c), at several spaced points (13) for the axial secur ing of the lining carrier disc (1c).

14. Lining carrier according to one of Claims 4 to 8 and 12, characterised in that the lining carrier disc (1c) is connected with the external circumference of the reinforcing disc (5) along its internal circumference by way of a surrounding weld seam (15).

15. Lining carrier for a clutch disc of a motor vehicle clutch as claimed in Claim 1, sub stantially as herein described with reference to and as illustrated by any one of the examples shown in the accompanying drawings.