DE1575898A1 - Friction pad assembly for disc brakes - Google Patents

Description

Friction pad arrangement for disc brakes

The invention "relates to friction pad assemblies for disc brakes.

In a vehicle disc brake, the part in which the friction pad assemblies towards and from Brake rotors are movably attached, so-called cushion guides to guide this movement. Such guides extend to just before the rotating body surface, with a Space between the pillow guides and the rotating body surface is left free to prevent movements of the rotating body which go out of its normal plane, e.g. when the vehicle drives in a not straight path to enable. Most friction pad assemblies include a backing plate that extends moved in the cushion guides, and a cushion or pad of friction material carried by the backing plate.

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So far it has been common practice to provide a support the thickness of which is greater than the above-mentioned gap, so that the support plate when the friction material itself completely is worn, not be pinched between the rotating body and the part to which the cushion assembly is attached can.

According to the invention is a support plate for a friction pad assembly made of relatively thin material, the thickness of which alone is not sufficient to ensure that the support plate cannot be jammed in the space between the rotating body and the cushion support part, and radial sand areas of the support plate or parts of these edge areas are so thickened in the axial direction that their dimensions is larger than the mentioned gap.

Viewed differently, a support plate is created according to the invention, its radial hand areas or parts these edge areas are axially thicker than the rest of the support plate, and only this? Edge areas or their Parts have an axial thickness that is greater than the gap between the brake rotating body and the part on which the cushion assembly is attached and with which the backing plate is to be used.

The axial thickening of the support plate can be achieved by increasing the thickness of the radial edge areas, by using separate thinning strips or corresponding ones Parts, for example by gluing or riveting, in the edge

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areas attached.

However, the radial edge regions or parts thereof are preferably axially deformed. While this axial Deformation can only consist of simple churning, but parts of the support plate are preferably made of whose plane is axially offset, ^ z. B. by arcuate or wave-shaped deformation of the edge areas or by training small depressions in the same.

Another feature of the invention provides that holes are formed in that part of the support plate, that within the projected area of the brake rotating body lies, with friction material through these holes when gluing this friction material can penetrate with the support plate, so that a thin layer of friction material, whose axial thickness corresponds to that of the thicker edge region, is formed on the rear side of the support plate, which helps reduce brake squeal.

The invention is explained in more detail below with reference to drawings of various exemplary embodiments «

Pig. 1 and 2 are front perspective views of FIG. Support plates, according to the invention;

Fig. "3 is a front view of a friction pad design" tion where Ie are omitted for clarity;

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Fig. 4 is a side view "of the same; Fig. 5 is a sectional view of a disc brake according to the invention.

The support plate 10 shown in FIG. 1 for a training cushion is relatively thin compared to a conventional backing plate and has one in each top corner Guide hole 12 formed, which is provided that a guide pin on a brake caliper, not shown or a similar η not shown housing extends therethrough. To the effective axial thickness of the plate up to such Degree to reinforce that the plate is not between the ends of the guide pins and a cooperating with the blade Brake rotating body can be pinched, parts 14 of the radial edge regions 16 are out of the plane of the rest of the Tolls Plate axially offset either by a stamping or pressing process.

In the modification shown in FIG. 2, parts are 18 of the radial itand areas 16 deformed arcuately in the axial direction.

It can be seen that the two constructions shown in FIGS. 1 and 2 also have more than just one axially deformed one Part H or 18 could be provided.

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As. Referring to Figures 3 and 4, the friction material is molded integrally with the backing plate to provide a friction pad 20 on the front of the backing plate 10, and the backing plate is more projected within an area when the brake rotator is installed Is provided with holes 22 through which friction material can pass to form a weapon thin layer 24 on the back of the plate. It has been shown that the creation of the layer 24 of friction material on the back of the plate Plate considerably contributes to reducing that Bremsquietsehen that can arise when the brake rotating body swings axially while the usual, the brake applying piston is in contact with the 0tü ^ a plate.

As an alternative solution, the heating pad 20 and the wafer-thin layer 24 of friction material can be two completely separate units which are glued or otherwise attached to the front and rear sides of the support plate 10 independently of one another. With such an arrangement, the friction pad and wafer-thin layer can be formed from friction materials of different compositions or with different properties.

Fig. 5 shows a disc brake according to the invention with a housing or bracket 30 with a hydraulic

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Cylinder 32 is in which a pair of fluid actuated pistons 34 and 36 are arranged back to back, the introduction of pressurized fluid between the pistons from any suitable source, not shown, causing the pistons to be axially displaced in opposite directions in the cylinder . In the vicinity of the front and widened open end of the cylinder 32, the housing 30 is formed with a transverse opening 38 in which an edge region of a rotating brake body 40 is received. The enlarged end of the cylinder 32 forms a pair of lateral cushion guides 42 for a friction cushion assembly 44 directly operated by the piston 34 , while a second friction cushion assembly 46 is supported by the housing 30 and is displaceable by the piston 36. Each friction block assembly comprises a backing plate having a layer of friction material for engagement with the rotating body 40 ^ and the backing plate 48 of the pin assembly 44 is provided with axially thickened edges as described above.

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Claims

909883/0988

Claims (11)

S MUNICH OO 1 ü 7 ü 8 9 Q SCHWEIÜUNSTHASSE 2 TIiLEFOSt S200Ö1! ■ IIOTECTPATKA'T »I CKClI KN 1A-33 patent claims 1. Disc brake with a rotating brake body, at least one friction cushion arrangement which can be brought into engagement with the rotating body, a part which supports the friction cushion arrangement in the direction of and from the rotating body movably and which includes claw guides for guiding a support plate of the friction kiaseijsnördnung during its movement, which extends up to briefly ΫΟΓ Äer Brehkiirperif extend pool, thereby ge k «η η ■ - a ei ο Ji ii $ t that radial edge areas (16) of the support plate (10) or parts (14 or 18) of the radial edge areas are designed to be axially divergent than the rest of the support plate ₁ and that the axial direction of the thickened areas (16) · or parts (H:. = · ■ or 18) is greater than the width of the space. 2 # disk brake according to claim 1, daduz ^ ch GEK e η η ζ η et calibrated that the axial thickening of the Randbereiclie (16) is effected by thickening of the separated strip or corresponding elements are attached to them * 909883/0968 3. Disc brake according to claim 1, characterized in that the edge regions (16) are axially are deformed and to thicken them with respect to the rest of the support plate (10). 4. Disc brake according to claim 3, characterized in that the axial deformation in there is splash formation in the edge areas. 5. Disc brake according to claim 3 or 4, characterized in that parts (14 or 18) of the support plate (10) are axially offset from the plane of the plate (10). · 6. Disc brake according to claim 5, characterized in that - k e η η ze ic tine t that the edge areas are curved- (18) or are deformed in a wave shape. 7. Disc brake according to claim 5, characterized in that the axial deformation is depressions comprises, which are formed in the edge regions (16) 8. Disc brake according to one of the preceding claims, characterized in that a ■. Layer (24) made of friction material, the axial thickness of which corresponds to that of the thickened edge region (16) on the rear 9098 8 3/096 8 - 3 - side of the support plate {10) is designed to reduce to contribute to the screeching of the fire. 9 »Disc brake according to one of the preceding claims, characterized ge k. "E η η ζ calibrate η et that holes (22) are formed in the path of the support plate which lies within the profiled surface" of the rotating brake body. 10. Disc brake with a brake rotating body, at least a friction cushion arrangement that can be brought into engagement with the rotating body, one the friction pad assembly to and from the rotating body movable supporting part, which pillow guides Sum guiding a support plate of the friction pad assembly includes during its movement, which extends to just before the Drehkkörperfläche extend, thereby g e k e η η ζ e i e h η e t that the support plate (10) made of relatively thin Fabric is manufactured whose thickness alone is not sufficient, to ensure that the support plate is not in the gap between the rotating body and which the Reibungskissenanordimng load-bearing leil can clamp, with radial edge areas (16) the support plate or parts (14 or 18) of the edge areas are thickened axially to such a degree that the thickness is larger than the gap. . 11. Disc brake with friction cushion arrangement, ge lc & ά η ze ich η et by a support plate (10), which at opposite radial edge areas (16) with axially ■ ".-. ■ .- 4 - '.- ■ 909883/0988 aligned spacers (14 or 18) formed is, which * are physically offset from the plane of the rest of the support plate (10), the spacers have an axial dimension calculated to be the distance of closest possible approach limit the friction pad assembly to a rotating brake body cooperating with it, and through a layer of friction material on at least one flat surface of the support plate. 909883/0988 Lee rse i te