Patent EP0206487A2 successfully refreshed from Google Patents.
EP0206487A2
Expired / Lapsed
EP
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Disc brake assembly having an electrical lining wear indicator
Assignee: General Motors France SA
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Filing: 1986-05-09
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Granted: —
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Expires: 2006-05-09
Abstract
Abstract A sliding-caliper disc brake assembly (10) includes an H-shaped anti-rattle spring (38) for a brake backing plate (16) that is movable directly by a brake apply piston (24), and an electrical lining wear indicator (52) comprising a mounting portion (54) moulded from electrically insulating plastics material with an embedded loop of electrical contact wire - (56) is fastened on to a central region (40) of the anti-rattle spring; with a leg (58) of the mounting portion extending into a recess (76) formed in a layer of friction material (14) carried by the brake backing plate.The mounting block is formed with an internal recess (62), a pair of lateral locating arms (70) and a snap-over detent tongue (66), for co-operation with the anti-rattle spring to ensure secure retention of the mounting portion in position on the spring.
Inventors
- 👤 Gabriel Grégoire
- 👤 Robert Beilleau
- 👤 Jean-Marc Dick
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 22:52
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/02; F16D65/04; F16D65/092; F16D65/095; F16D65/097; F16D65/0973; F16D65/0974; F16D65/0977; F16D66/00; F16D66/02; F16D66/021; F16D66/022; F16D66/023; F16D66/024
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
219 words
A disc brake assembly having an electrical lining wear indicator, in which a brake pad (12) comprising a layer of friction material (14) carried by a backing plate (16) is slidably mounted on a laterally spaced pair of mounting pins (18), an anti-rattle spring (38) is provided for the brake pad (12), the lining wear indicator (52) comprises an electrical conductor (56) having a covering of electrically insulating material and including a detector portion that extends into a recess (76) in the friction material (14) of the brake pad (12), and a mounting is provided for the electrical conductor (56), characterised in that, in an assembly in which the anti-rattle spring (38) for the brake pad (12) includes a central region (40) engaged over an upper edge (42) of the brake pad (12) and a pair of oppositely extending resilient arms (44) engaged under the respective mounting pins (18), the mounting for the elecirical conductor (56) includes a support portion (60) that extends over the backing plate (16) and the anti-rattle spring (38) and is fastened on to the anti-rattle spring (38) to maintain the electrical conductor (56) securely in position relative to the backing plate (16) and retain the detector portion (58) in position in the recess (76) in the friction material (14) of the brake pad (12).
Claim 2
Dependent Claim
219 words
A disc brake assembly having an electrical lining wear indicator, in which a brake pad (12) comprising a layer of friction material (14) carried by a backing plate (16) is slidably mounted on a laterally spaced pair of mounting pins (18), an anti-rattle spring (38) is provided for the brake pad (12), the lining wear indicator (52) comprises an electrical conductor (56) having a covering of electrically insulating material and including a detector portion that extends into a recess (76) in the friction material (14) of the brake pad (12), and a mounting is provided for the electrical conductor (56), characterised in that, in an assembly in which the anti-rattle spring (38) for the brake pad (12) includes a central region (40) engaged over an upper edge (42) of the brake pad (12) and a pair of oppositely extending resilient arms (44) engaged under the respective mounting pins (18), the mounting for the elecirical conductor (56) includes a support portion (60) that extends over the backing plate (16) and the anti-rattle spring (38) and is fastened on to the anti-rattle spring (38) to maintain the electrical conductor (56) securely in position relative to the backing plate (16) and retain the detector portion (58) in position in the recess (76) in the friction material (14) of the brake pad (12).
Claim 3
Dependent Claim
135 words
A disc brake assembly according to claim 1, in which the oppositely extending resilient arms (44) of the anti-rattle spring (38) comprise a first pair of opposed arms disposed adjacent one face - (48) of the backing plate (16), and the anti-rattle spring (38) also has a second pair of opposed arms (50) for engagement with an opposite face of the backing plate (16), characterised in that the support portion (60) of the mounting for the electrical conductor (56) is formed with laterally extending opposed locating arms (70) which are engaged over edge portions of the central region (40) of the anti-rattle spring (38), between the arms (44,50) of the first and second pairs, to maintain the support portion (60) of the mounting for the electrical conductor (56) centred relative to the anti-rattle spring (38).
Claim 4
Dependent Claim
96 words
A disc brake assembly according to claim 1 or 2, characterised in that the support portion (60) of the mounting for the electrical conductor (56) includes a recess portion (62) arranged to receive a first edge portion of the central region (40) of the anti-rattle spring (38), and also includes a clip portion (64,66) that is resiliently engageable over a second, opposite edge portion of the central region (40) of the anti-rattle spring (38), to hold the support portion (60) of the mounting for the electrical conductor (56) securely in position on the anti-rattle spring (38).
Claim 5
Dependent Claim
24 words
A disc brake assembly according to any one of claims 1 to 3, characterised in that the electrical conductor (56) comprises a contact wire.
Claim 6
Dependent Claim
49 words
A disc brake assembly according to claim 4, characterised in that the mounting for the contact wire comprises an L-shaped block (54) of heat-resistant polytetrafluorethylene or of a thermoset or other heat-resistant electrically insulating material, and includes a leg portion (58) accommodating the detector portion of the contact wire.
Claim 7
Dependent Claim
50 words
A disc brake assembly according to claim 4, characterised in that the covering of electrically insulating material extends throughout the length of the contact wire (98), and the mounting for the electrically insulated contact wire (98) comprises a resilient retainer clip (96) made of stainless steel or other heat-resistant material.
Claim 8
Dependent Claim
89 words
A disc brake assembly according to claim 6, characterised in that the contact wire (98) is in the form of an elongate loop having a twisted portion - (100) forming a detector end region of the looped contact wire (98), and a sleeve (102) of heat-resistant plastics material closely surrounds the twisted portion (100) and an adjacent length of the looped contact wire (98) and is effective to maintain the twisting of the wire (98) and make at least the twisted portion (100) of the wire (98) relatively rigid.
Claim 9
Dependent Claim
31 words
A disc brake assembly according to claim 6 or 7, characterised in that the contact wire (98) is mounted on the resilient retainer clip (96) by means of interposed grommets (104,108).
Claim 10
Dependent Claim
50 words
A disc brake assembly according to any one of claims 1 to 8, characterised in that the electrical conductor (56) is in the form of a loop, and a pair of connecting lead portions (74) for the electrical conductor (56) are connectible to form part of an electrical warning circuit.
Claim 11
Dependent Claim
89 words
A disc brake assembly according to claim 9, characterised in that the connecting lead portions (74) are connected to form part of an electrical warning circuit that includes a source of electrical energy and an audible and/or visual warning device, such that when a predetermined thickness of the brake lining material (14) has become worn away, by contact with a rotary brake disc (36), the contact wire (56) is exposed and makes electrical contact with the brake disc (36) to complete the electrical circuit and actuate the warning device.
Claim 12
Dependent Claim
80 words
A disc brake assembly according to claim 10, for braking a road wheel of a motor vehicle, characterised in that the contact wire (56) is connected in series with a contact wire of at least one other disc brake assembly that is selectively operable for braking another respective road wheel of the vehicle, and also with a continuity-check switch which, when closed, completes an electrical circuit to energize an indicator device if there is electrical continuity through the contact wires.
Claim 13
Dependent Claim
53 words
A disc brake assembly according to any one of claims 1 to 11, characterised in that the backing plate (16) provided with the lining wear indicator (52) comprises part of a sliding-caliper assembly, and for brake actuation the backing plate (16) is engageable by a selectively actuable piston (24) of the sliding-caliper assembly.
References Cited (Backward Citations)
No citation records indexed.
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