VEHICLE DISC BRAKE SYSTEM COMPRISING A GUIDING CALIPER SHIELD HELD BY A SUPPORT

Abstract

A motor vehicle disc brake system comprising a support portion (2) disposed in a plane transverse to the axis of rotation of the disc (A), having mounting holes for attachment to a suspension element (30), and comprising a brake lining guide bracket (18) passing over the brake disc, comprising on the inside of the vehicle (INT) an inner portion of the bracket (20) and on the other side an outer portion of the bracket (22), this system comprising a support forming a half-bracket (36) constituting in a single piece the support portion (2) and the inner portion of the bracket (20). Figure 2

Description

Title of the invention: VEHICLE DISC BRAKE SYSTEM COMPRISING A GUIDING CALIPER SHIELD HELD BY A SUPPORT

[0001] The present invention relates to a motor vehicle disc brake system comprising a guide bracket for a lining clamping caliper, fixed to the vehicle suspension by a support, and a motor vehicle equipped with such a brake system.

[0002] A type of disc brake system known for motor vehicles, presented in particular by document FR-A1-2995867, comprises a vehicle suspension arm receiving a wheel, having around the axle of this wheel a transverse plane which receives a support forming a plate fixed on this plane.

[0003] A bracket covering an edge of the brake disc has two parts arranged on each side of this disc. An inner part of the bracket, arranged on the side facing the interior of the vehicle, is fixed by two screws to the support plate; the outer part of the bracket is fixed to this inner part by two posts arranged axially above the disc.

[0004] A brake caliper having on one side of the disc a piston for clamping two brake linings held in the clevis, is fixed to this clevis by the guide posts allowing a small axial sliding movement which allows it to automatically adjust its position according to the wear of the linings to maintain a symmetry of the clamping.

[0005] Assembling the brake system involves attaching the bracket to the suspension arm, attaching the caliper to this bracket, and mounting the yoke onto the caliper. This represents a number of operations requiring, at each stage, the supply of connecting screws, the positioning of the components, and tightening. These various operations, including the manufacturing of the different components, their supply, management, and installation, require time and incur costs.

[0006] The connection between the clevis and the support, generally made of different materials, subjected to high mechanical and thermal stresses during heavy braking generating strong heating of the disc and linings, is delicate to design and implement.

[0007] Furthermore, in repair shops, the connection between the clevis and the support may be disassembled for maintenance operations on the vehicle, and reassembled under conditions that do not correspond to the specifications imposed for assembly. in series production by a manufacturer. In particular, a faulty assembly of the bracket onto the support, with improper tightening of the connecting screws, can lead to defects generating braking noises. Safety may also be compromised.

[0008] The present invention aims in particular to avoid these problems of the prior art.

[0009] To this end, it proposes a motor vehicle disc brake system, comprising a support part disposed in a plane transverse to the axis of rotation of the disc, having fixing holes on a suspension element, and comprising a brake lining guide bracket passing over the brake disc, comprising on the inside of the vehicle an inner part of the bracket and on the other side an outer part of the bracket, this brake system being remarkable in that it comprises a support forming a half-bracket constituting in a single piece the support part and the inner part of the bracket.

[0010] One advantage of this brake system is that by making the inner part of the clevis in the same piece as the support, the connection between these two elements is eliminated, which avoids all the technical problems caused by the design of a connection between two different materials subjected to high stresses, and which can undergo poorly controlled disassembly and reassembly operations.

[0011] Furthermore, by avoiding a removable connection between the support and the inner part of By using a screed, we reduce the number of parts and the assembly time, which lowers costs, and we produce a part that is less bulky and lighter compared to the two parts assembled together.

[0012] The braking system according to the invention may further comprise one or more of the following features, which may be combined with each other.

[0013] Advantageously, the support forming half-screed has an overall flat shape comprising two parallel outer faces.

[0014] In particular, the support part may include a bore centered on the axis, surrounded by the fixing holes on the suspension element.

[0015] Advantageously, the half-screed support comprises on one side of the support part two radially external arms constituting the inner part of the screed.

[0016] In this case, the arms can be axially offset towards the outside direction relative to the support part which is flat.

[0017] Advantageously, each arm has at its end a guide hole receiving a column which secures the outer part of the clevis and a sliding guide for a brake caliper.

[0018] Advantageously, the support forming half-cage is made from a single piece of aluminum alloy.

[0019] The invention also relates to a motor vehicle equipped with brakes on its wheels, remarkable in that it includes braking systems comprising any one of the preceding characteristics.

[0020] The invention will be better understood and other features and advantages will become more apparent upon reading the following description given by way of example, with reference to the accompanying drawings in which:

[0021] [Fig-1] is a view of a disc brake system according to the prior art presented without the stirrup;

[0022] [Fig.2] shows the inner side of a disc brake system according to the invention which is fixed to a suspension arm; and

[0023] [Fig.3] is a view of this brake system shown without the caliper.

[0024] Fig. 1 presents a brake system comprising a support 2, and a clevis 18 fixed to this support having an internal passage 26 receiving the brake disc, comprising an inner part 20 turned towards the interior of the vehicle INT and an outer part 22.

[0025] The support 2 forms a plate having a bore 8 centered on the axis of rotation of the wheel and the brake disc A, surrounded by four fixing holes 6 on the end of a suspension arm, and two tabs 10 having at their end a hole receiving a connecting screw 12 of the inner part of the clevis 20 fixed on the outer face of the support.

[0026] The yoke 18 has on its two parts 20, 22 radially outside the brake disc, two guide holes 24 each receiving a screw ensuring the tightening of these two parts, and forming an axial guide column of the brake caliper having a hydraulic piston for tightening the brake linings which are held in axial grooves 28 of the yoke.

[0027] A rigid assembly is thus formed comprising the bracket 18 fixed to the support 2, but which requires a connection comprising the two connecting screws 12 which are in addition to the four fixing screws of this support on the suspension engaged in the fixing holes 6. The support 2 is generally formed in an aluminum alloy and the clevis 18 in a steel, the connection of these two metals requires particular attention for the design and assembly.

[0028] Figures 2 and 3 show, in a single part, a half-clamp support 36, comprising a generally flat shape having two parallel outer faces arranged in a transverse plane. The half-clamp support 36 combines the function of a flat support 2 fixed to the outer face of a sheet 32 ​​welded to the end of a suspension arm 30 by screws 34 surrounding the central bore 8, and the function of an inner part of the clamp 20.

[0029] The inner part of the cleat 20 forms a substantially flat assembly, axially offset outwards relative to the support 2, comprising two radially external arms 46 extending the flat support 2, each of which terminates with the guide hole 24.

[0030] The outer part of the clevis 22 remains identical to that shown [Fig.1], including its fixing by the columns 44 engaged in the guide holes 24 of the clevis 18. The brake caliper 40 having two holes receiving the columns 44 to ensure its axial guidance, also remains identical.

[0031] By forming the half-clamp support 36 in the same piece, the creation and assembly of an intermediate link between the support part 2 and the inner part of the clamp 20 is avoided, which makes it possible to create a compact part which is optimized with regard to its volume and mass.

[0032] In particular, thermomechanical resistance calculations show the feasibility of such a part comprising areas with acceptable stresses in the base of the arms 46, which is the most stressed part, with an overall mass saving of about 1kg compared to brake systems according to the prior art.

[0033] By eliminating the internal connection in the half-clamp support 36, a particularly rigid continuity of the clamp 18 with the support 2 and the suspension 30 is obtained, and a possibility of failure of this connection is removed, which eliminates risks of braking noise, or other incidents that could lead to a failure of this braking.

[0034] The half-clamp support 36 constitutes a relatively flat assembly that is easy to produce by molding or forging. Furthermore, an assembly step of the clamp 18 onto its support 2 is eliminated, and connecting screws between them are removed, thus reducing the costs of the parts and assembly.

Claims

Demands

1. Motor vehicle disc brake system, comprising a support part (2) disposed in a plane transverse to the axis of rotation of the disc (A), having fixing holes (6) on a suspension element (30), and comprising a brake lining guide bracket (18) passing over the brake disc, comprising on the inside of the vehicle (INT) an inner part of the bracket (20) and on the other side an outer part of the bracket (22), the disc brake system comprising a support forming a half-bracket (36) constituting in a single piece the support part (2) and the inner part of the bracket (20), characterized in that the support forming a half-bracket (36) comprises on one side of the support part (2) two radially external arms (46) constituting the inner part of the bracket (20),and in that each arm (46) has at its end a guide hole (24) receiving a post (44) which secures the outer part of the yoke (22) and provides sliding guidance for a brake caliper (40).

2. Brake system according to claim 1, characterized in that the support forming half-cage (36) has an overall flat shape comprising two parallel outer faces.

3. Brake system according to claim 2, characterized in that the support part (2) has a bore (8) centered on the axis (A), surrounded by the fixing holes (6) on the suspension element (30).

4. Brake system according to claim 1, characterized in that the arms (46) are axially offset towards the outside direction relative to the support part (2) which is flat.

5. Brake system according to any one of the preceding claims, characterized in that the support forming half-cage (36) is made of a single piece of aluminum alloy.

6. Motor vehicle equipped with brakes on its wheels, characterized in that it comprises braking systems according to any one of the preceding claims.

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