GB2162911A

GB2162911A - Friction lining member for use in couplings

Info

Publication number: GB2162911A
Application number: GB08519946A
Authority: GB
Inventors: Manfred Fischbach; Erhard Vogel
Original assignee: Textar GmbH
Current assignee: Textar GmbH
Priority date: 1984-08-10
Filing date: 1985-08-08
Publication date: 1986-02-12
Also published as: IT8521858A0; DE8423774U1; FR2568964A1; GB8519946D0; GB2162911B; IT1185858B; IT8522727V0

Abstract

To provide a friction lining member for a coupling, a friction lining (1) is provided with an annular carrier plate (2), the carrier plate (2) being fastened by circular deformable flanged connections (4), (5) around the peripheries of perforations in resilient plates (3) of the coupling. <IMAGE>

Description

SPECIFICATION Friction lining member for use in couplings The invention relates to a friction lining member for use in couplings, preferably motor vehicle couplings, and also to such couplings incorporating friction lining members.

Friction lining members in the form of friction lining ring discs generally have an annu lar carrier plate which is fastened, by riveted connections, for example tubular rivets, to disc springs of the coupling.

Current rotating friction lining members are generally in the form of discs and are usually annular. They produce centrifugal forces which place tangential and radial tensile stresses on the disc. As the tensile strength of friction materials is relatively low, it is very difficult to increase the tear resistance, i.e. the rotational speed at which the material breaks up, without affecting the desired frictional properties. Therefore additional reinforcing means, for example a carrier plate, reinforcing layers, wire mesh, or the like, are used. The linings-whether with or without reinforce ment-are fastened to coupling disc springs, which may be in the form of spring plate segments, by means of riveted connections, in particular tubular rivets.

According to one aspect of the present invention, there is provided a friction lining member for use in couplings having a resilient plate with an aperture for use in fastening the lining member to the resilient plate, the lining member comprising a carrier plate to which a friction lining material is secured, the carrier plate having a fastening portion extending in a direction away from a surface of the carrier plate to provide a deformable region whereby said lining member can be secured to said resilient plate by passing the fastening portion through the aperture and by deforming the deformable region.

According to another aspect of the present invention there is provided a coupling comprising a resilient plate having an aperture; and a friction lining member as defined in the preceding paragraph with its fastening portion passed through the aperture, the deformable region having been deformed over the perimeter of said aperture. The carrier plate is preferably annular.

In one embodiment, a projection in the form of a collar extends from and is integral with the carrier plate. This penetrates a perforation in the resilient plate of a coupling and has, for fastening by means of flanging, a deformable region providing a closing head.

In this arrangement the friction lining material is not riveted directly onto the resilient plate or to a coupling disc, but is pressed onto a carrier plate. In addition to increasing the rotational speed at which the material breaks up, this produces the greatest possible thickness of material for wear, as the friction lining material does not have the otherwise customary countersunk hole for insertion of the tubular rivet, the head height of which reduces the thickness of material available for wear. The lining carrier plate may be provided with several preformed collars in the form of tubular shanks, for fastening to the resilient plates.

This saves the specific use of rivets, or the like.

Advantageously, the friction lining material has, where the resilient plate is connected to the flanged collar, a hole having a diameter greater than that of the perforation of the resilient plate. Such a free hole facilitates access for a flanging tool and makes it easier to produce the particular connection.

Where there are two friction lining members 5, of which the carrier plates face one another and enclose between them a plurality of resilient plates of a coupling, the flanged collar connections preferably have, at least on the same resilient plate, fastening portions providing deformable regions or flanged collars extending in opposite axial directions. The flanged collars, arranged alternately around the whole circumference in opposite axial directions, ensure that the friction lining members are held in a satisfactory, reliable and secure manner.

A reinforced, e.g. fibre-reinforced, synthetic version with pre-formed, flanged collars can also be provided as the carrier plate.

For a better understanding of the present invention, and to show how the same may be carried into effect, reference will now be made, by way of example, to the accompanying drawings, in which: Figure ? is a diagrammatic representation of a friction lining member having an annular carrier plate; Figure 2 shows, on a larger scale, a diagrammatic representation of a section along the line ll-ll of Fig. 1; and Figure 3 shows, on a larger scale, a diagrammatic representation of a section along line Ill-Ill of Fig. 1.

The annular friction lining member, in the form of a coupling annulus (or disc-not shown) has material forming a friction lining 1 which is backed by a carrier plate 2. Circular recesses of equal size are provided on the annular surface of the friction lining 1. A similar friction lining 1' is backed by a further carrier plate 2'. In order to fasten the friction lining members to coupling disc springs 3 (in the form of resilient sheet metal plates), the carrier plates 2, 2' associated with the respective friction linings 1, 1' are provided with fastening portions in the form of tubular rivetlike collar projections 4,4'.These collar projections 4, 4' have deformable regions which can be turned to form closing heads 5,5' which fit around the rim of perforations (apertures) in the correspondingly perforated cou pling disc springs 3 and therefore produce a firm and secure connection between the carrier plates 2, 2' and the disc spring 3. At the fastening points there are, in the friction lining, apertures 6,6' which make it easier to turn the deformable regions to produce the connection.The collar 4 of the carrier plate 2 penetrates the perforation of the coupling disc spring 3 and, after being pressed to form flanges at its closing head 5, sits tightly against the surface of the disc spring 3. As a result, -the friction lining 1 pressed onto the carrier plate 2, is securely connected with the coupling disc spring 3, in an economical manner and without reducing its thickness for wear.

The friction lining may be secured to the carrier plate in several ways, including pressing the friction lining to the hardened or tempered steel carrier plate while hot, or providing an adhesive between the carrier plate and the friction lining.

Fig. 2 shows the fastening portion extending in a first axial direction, while Fig. 3 shows the fastening extending in a second axial direction opposite to the first. In a coupling, for example a vehicle coupling, two friction lining members lie with their carrier plates adjacent the disc spring. The closing heads 5,5' are connected alternately with the coupling disc spring 3 so that in each case the flanged collars 4,4' extend in opposite axial directions. In this way, two friction linings 1 , 1' are fastened, via their carrier plates 2,2' in an immovable and secure manner, with a coupling disc spring 3.

As regards the material of the lining carrier, this should have considerably greater tensile strength than the friction material, and, moreover, enables a flangeable (pressable) collar, for example a pre-formable rivet shank, to be produced.

In one form, the carrier plate may consist of a reinforced, for example fibre reinforced, synthetic plastics material, which may be shaped on the face of the plate which is to carry the lining to provide preformed (for example tipstretched) collars which can be softened using heat and then pressed into position over the perimeter of the associated perforation of the disc spring 3.

The above described arrangement thus enables a friction lining to be fastened to the coupling disc without the riveted connections and tubular rivets hitherto known and provides a substantial increase in the thickness for-wear of the lining.

Claims

1. A friction lining member for use in couplings having a resilient plate with an aperture for use in fastening the lining member to the resilient plate, the lining member comprising a carrier plate to which a friction lining material is secured, the carrier plate having a fastening portion extending in a direction away from a surface of the carrier plate to provide a deformable region whereby said lining member can be secured to said resilient plate by passing the fastening portion through the aperture and by deforming the deformable region.

2. A friction lining member according to claim 1, wherein said lining material is provided with an aperture around the fastening portion and having a diameter greater than that of said fastening portion.

3. A coupling comprising: a resilient plate with an aperture; and a friction lining member as claimed in claim 1 or 2, with its fastening portion passed through the aperture, the deformable region having-been deformed over the perimeter of said aperture.

4. A coupling as claimed in claim 3, which includes a further friction lining member as claimed in claim 1 or 2, whose fastening portion passes through a further aperture of the resilient plate, the deformable region having been deformed over the perimeter of said further aperture, the carrier plates of the friction lining members abutting opposite faces of the resilient plate.

5. A friction lining member as claimed in claim 1 or 2, or a coupling as claimed in claim 3 or 4, in which the or each carrier plate is annular.

6. A friction lining member as claimed in claim 1, 2 or 5 or a coupling as claimed in claim 3, 4 or 5, the or each lining member being made of a reinforced plastics material shaped to provide said fastening portion(s).

7. A friction lining member or a coupling as claimed in claim 6, in which the reinforced material is a fibre reinforced material.

8. A friction lining member as claimed in claims 1,2,5,6 or 7 or a coupling as claimed in claim 3,4,5,6 or 7 in which the or each fastening portion is such that it can be softened under the influence of heat and then pressed over the perimeter of the associated aperture.

9. A friction lining member substantially as hereinbefore described with reference to the accompanying drawings.

1 0. A coupling substantially as hereinbefore described with reference to the accompanying drawings.