VEHICLE DISC BRAKE SYSTEM COMPRISING A CALIPER GUIDE YOKE HELD BY A SUPPORT

Abstract

Motor vehicle disc brake system, comprising a support part (2) arranged in a plane transverse to the axis of rotation of the disc (A), having fixing holes on a suspension element (30), and comprising a yoke (18) for guiding brake linings passing above the brake disc, comprising on the inside of the vehicle (INT) an inner yoke part (20) and on the other side an outer yoke part (22), this system comprising a support forming a half-yoke (36) constituting in one piece the support part (2) and the inner yoke part (20). Figure 2

Description

Title of the invention: VEHICLE DISC BRAKE SYSTEM COMPRISING A GUIDE YOKE FOR A CALIPER HELD BY A SUPPORT

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

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

[0003] A yoke covering an edge of the brake disc comprises two parts arranged on each side of this disc. An inner yoke part, arranged on the side facing the inside of the vehicle, is fixed by two screws to the support plate, the outer yoke part is fixed to this inner part by two columns arranged axially above the disc.

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

[0005] The assembly of the brake system involves fixing the support to the suspension arm, fixing the caliper to this support and mounting the yoke on this caliper, which represents a number of operations requiring at each stage the supply of connecting screws, the positioning of the elements and the tightening. These different operations including the manufacture of the different components, their supply, their management and the installation require time and entail costs.

[0006] The connection between the yoke and the support, generally comprising different materials, subject to high mechanical and thermal stresses during heavy braking generating significant heating of the disc and the linings, is difficult to design and implement.

[0007] Furthermore, in repair workshops, the connection between the yoke and the support can be dismantled for maintenance operations on the vehicle, and reassembled in conditions which do not correspond to the specifications imposed for assembly in series at a manufacturer. In particular, a faulty assembly of the yoke on the support, with improper tightening of the connecting screws, can lead to defects generating braking noise. Safety can 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 arranged in a plane transverse to the axis of rotation of the disc, having holes for fixing to a suspension element, and comprising a brake lining guide yoke passing above the brake disc, comprising on the inside of the vehicle an inner yoke part and on the other side an outer yoke part, this brake system being remarkable in that it comprises a support forming a half-yoke constituting the support part and the inner yoke part in one piece.

[0010] An advantage of this brake system is that by making the inner part of the yoke from 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 subject 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 interior part of screed reduces the number of parts and assembly time, which reduces costs, and produces a less bulky and lighter part compared to the two parts assembled together.

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

[0013] Advantageously, the half-cage support has a generally flat shape comprising two parallel outer faces.

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

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

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

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

[0018] Advantageously, the half-clamp support 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 comprises brake systems comprising any one of the previous characteristics.

[0020] The invention will be better understood and other characteristics and advantages will appear more clearly on reading the description given below by way of example, with reference to the appended drawings in which:

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

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

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

[0024] [Fig.l] shows a brake system comprising a support 2, and a yoke 18 fixed to this support having an internal passage 26 receiving the brake disc, comprising an internal part 20 facing towards the interior of the vehicle INT and an external part 22.

[0025] The support 2 forms a plate comprising 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 lugs 10 having at their end a hole receiving a connecting screw 12 of the inner part of the yoke 20 fixed on the external face of the support.

[0026] The yoke 18 comprises 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 comprising 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 stirrup 18 fixed to the support 2, but which requires a connection comprising the two connection screws 12 which are added to the four screws for fixing this support to the suspension engaged in the fixing holes 6. The support 2 is generally formed from an aluminum alloy and the yoke 18 from steel, the connection of these two metals requires particular attention for the design and assembly.

[0028] Figures 2 and 3 show in the same part a support forming a half-yoke 36, comprising a generally flat shape having two parallel outer faces arranged in a transverse plane. The support forming a half-yoke 36 combines the function of a flat support 2 fixed on 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 yoke 20.

[0029] The inner part of the yoke 20 forms a substantially flat assembly, offset axially outwards relative to the support 2, comprising two radially external arms 46 extending the flat support 2, which each end in the drilling of guidance 24.

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

[0031] By forming the half-yoke support 36 in a single part, the production and assembly of an intermediate connection between the support part 2 and the inner yoke part 20 is avoided, which makes it possible to produce 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 zones presenting acceptable constraints in the base of the arms 46 which is the most stressed part, with an overall weight saving of approximately 1 kg compared to the brake systems according to the prior art.

[0033] By eliminating the internal connection in the half-cylinder support 36, a particularly rigid continuity of the cylinder 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 which could lead to a failure of this braking.

[0034] The half-clevis support 36 constitutes a relatively flat assembly that is easy to produce by casting or forging. In addition, an assembly operation of the clevis 18 on its support 2 is eliminated and connecting screws between them are removed, which reduces the costs of the parts and of the assembly.

Claims

Claims

1. Motor vehicle disc brake system, comprising a support part (2) arranged 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 yoke (18) for guiding brake linings passing above the brake disc, comprising on the inside of the vehicle (INT) an inner yoke part (20) and on the other side an outer yoke part (22), characterized in that it comprises a half-yoke support (36) constituting in one piece the support part (2) and the inner yoke part (20).

2. Brake system according to claim 1, characterized in that the half-clamp support (36) has a generally flat shape comprising two parallel outer faces.

3. Brake system according to claim 2, characterized in that the support part (2) comprises 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 2 or 3, characterized in that the half-clamp support (36) comprises on one side of the support part (2) two radially external arms (46) constituting the inner clamp part (20).

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

6. Brake system according to claim 4 or 5, characterized in that each arm (46) has at its end a guide bore (24) receiving a column (44) which ensures the fixing of the outer part of the yoke (22) and a sliding guide of a braking caliper (40).

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

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

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