JPS6056932B2 - Friction pad assembly - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a friction pad assembly for use in a sliding caliper type disc brake.

Typically, a friction pad is supported by a guide of a disc brake, and braking force is transmitted from the pad to the vehicle frame via the guide.

A gap is usually provided between the guide and the pad to allow the pad to slide toward and away from the disc during application and release of the brake. In order to prevent the pad from rattling on the guide, it has previously been proposed to attach an anti-rattle spring to the pad to bias the pad against the guide. A pad assembly provided with an anti-rattle spring is disclosed in applicant's British Patent No. 55727/
No. 74 complete specification.

The spring shown herein has a coiled portion and two arms extending outwardly from the coiled portion. The spring is attached to an upwardly extending projection on the back plate of the pad by a pin extending through the coil portion of the spring. The casting of this pad assembly requires a protrusion for the pin to pass through, which requires a larger blank material than without the protrusion, and therefore requires a larger blank material when manufacturing the back plate by stamping. A lot of scrap is generated,
After all, manufacturing costs are high.

Become something. The material for the back plate must be of high quality and therefore of high cost. To reduce the amount of scrap, it has been proposed to position the anti-rattle spring in a groove in the backing plate, where the pad holds the spring in place. This proposal has the disadvantage that the spring must be placed in the groove before the friction material is molded onto the backing plate. Therefore,
The heat required during the molding process can damage the springs and alter their properties. Further, as the pad cools, the spring remains "stuck" and the pad assembly cannot be adjusted for proper alignment within the brake. Such defects in alignment result in uneven side loads on the pad, causing the pad to tilt within the pad's guides.

It is an object of the present invention to overcome, or at least reduce, the above-mentioned disadvantages of pad assemblies previously proposed.

According to the invention, a front surface and a rear surface, a top edge, and two
a backing plate having two side edges; a friction material attached to the front side of the backing plate; a protrusion extending upwardly from the top edge of the backing plate; an anti-rattling spring mounted on said base and resiliently engaging said guide to prevent said plate from rattling against said guide on said backing plate; has a pair of recesses spaced apart from each other, a central abutting portion of the protrusion is defined between the pair of recesses, and a center abutting portion of the protrusion is defined laterally outwardly of the pair of recesses. a pair of side abutments are defined; the anti-rattle spring is attached to the protrusion by a curved portion of the anti-rattle spring, the curved portion being connected to the pair of recesses; A friction pad assembly is provided extending through the center abutment portion and in mating engagement with the central abutment portion and the side abutment portions.

Some embodiments of friction pad assemblies according to the present invention will be described in detail below with reference to the accompanying drawings. Each type of pad assembly includes a backing plate 1 and a pad 2.

The back plate 1 has a laterally extending shoulder (not shown) which is not in contact with the friction pad material, and which shoulder does not contact the friction pad material when mounted on a sliding caliper type disc brake. supported on guides. The pad assembly includes an anti-rattle spring 4 having a rectangular bend 5 and two outwardly upwardly extending arms 6.
Contains. When mounted on the brake, arm 6 biases the shoulder of backing plate 1 onto the guide to help prevent or reduce rattling of the assembly.
1 and 2, the bend 5 of the spring has a substantially sub-rectangular shape and the two sides of the bend 5 form recesses 11 formed in the upright part or protrusion 8 of the backing plate 1. The pad assembly is shown fitting therein.

In this type of pad assembly, a notch 17 is provided on one side of the protrusion 8, and the spring arm 6 is attached to the rear surface IA of the back plate.
It is made so that it does not protrude beyond the plane of the plane. 5. A friction pad assembly according to any one of claims 1 to 4, characterized in that the friction pad assembly extends in a direction.

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a friction pad assembly for use in a sliding caliper type disc brake.

Typically, the friction pad is supported by a guide of the disc brake, and brake drag is transmitted from the pad to the vehicle frame via the guide.

A gap is usually provided between the guide and the bud to allow the bud to slide toward and away from the disc during application and release of the brake. In order to prevent the bud from rattling on the guide, it has been proposed in the past to attach an anti-rattle spring to the bud to bias the bud against the guide. A pad assembly with an anti-rattle spring is disclosed in the applicant's UK Patent Application No. 55727/
No. 74 complete specification.

The spring shown herein has a coiled portion and two arms extending outwardly from the coiled portion. The spring is attached to an upwardly extending projection on the back plate of the bud by a pin extending through the coil portion of the spring. The casting of this butt assembly requires a protrusion for the pin to pass through, which requires a larger blank material than would be required without the protrusion, and therefore requires a larger blank material when manufacturing the back plate by stamping. A lot of scrap is generated,
After all, manufacturing costs are high. Become something.

The material for the back plate must be of high quality and therefore of high cost. To reduce the amount of scrap, it has been proposed to position the anti-rattle spring within a groove in the backing plate, in which case the butt holds the spring in place! do. This proposal has the disadvantage that the spring must be placed in the groove before the friction material is molded onto the backing plate. Therefore, the heat required in the molding process damages the spring and changes its properties. Furthermore, when the bud cools down, the spring becomes 1
The pad assembly will remain stuck and cannot be adjusted for proper alignment within the brake. Such defects in alignment result in uneven side loads on the pad, causing the pad to tilt within the guides of the pad. It is an object of the invention to overcome, or at least reduce, the above-mentioned disadvantages of hitherto proposed pad assemblies.

According to the invention, a front surface and a rear surface, a top edge, and two
a backing plate having two side edges; a friction material attached to the front side of the backing plate; a protrusion extending upwardly from the top edge of the backing plate; an anti-rattle spring attached to said projection and resiliently engaged with said guide to prevent the plate from rattling against said guide on said backing plate; a pair of recesses spaced apart from each other in the direction, a central abutting portion of the protrusion is defined between the pair of recesses, and the protrusion is disposed laterally outwardly of the pair of recesses; a pair of side abutments are defined; the anti-rattle spring is attached to the protrusion by a curved portion of the anti-rattle spring; A friction pad assembly is provided that extends through the recess and is matingly engaged with the central abutment and side abutments.

Some embodiments of friction pad assemblies according to the invention will now be described in detail with reference to the accompanying drawings. Each type of pad assembly includes a back plate 1 and a pad 2.

The backing plate 1 has a laterally extending shoulder (not shown) which does not contact the friction pad material and which shoulder does not contact the friction pad material when mounted on a sliding caliper type disc brake. supported on guides. The pad assembly includes an anti-rattle spring 4 having a rectangular bend 5 and two outwardly upwardly extending arms 6.
Contains. When mounted on the brake, arm 6 biases the shoulder of backing plate 1 onto the guide to help prevent or reduce rattling of the assembly.
1 and 2, the bend 5 of the spring has a substantially sub-rectangular shape and the two sides of the bend 5 form recesses 11 formed in the upright part or protrusion 8 of the backing plate 1. The pad assembly is shown fitted therein.

In this type of pad assembly, a notch 17 is provided on one side of the protrusion 8, and the spring arm 6 is attached to the rear surface 1A of the back plate.
It is made so that it does not protrude beyond the plane of the plane. The pad assembly shown in FIG. 3 is similar to that shown in FIGS. 1 and 2, but the notch 17 is not provided.

FIG. 4 shows a bud assembly in which the springs sit in recesses 18 in uprights or projections 8 of backing plate 1 and are retained within recesses 18 by ridges or lips 16. .

In order to make the height of the protrusion 8 as low as possible, the recess is
It is desirable to be located close to the base of the In each of the several embodiments described above, the bend in the spring can be configured such that the spring's inherent elasticity holds the spring in place within the recess.

Additionally, the springs can be attached to the backing plate after the pads are attached to the backing plate, so that the springs do not receive the heat required to bond the pads to the backing plate. The protrusion 8 is considerably lower than the protrusion height of the butt assembly described in the full specification of the aforementioned UK patent application.

The pad assembly described in the above-mentioned British Complete Specification required a large recess in the disc brake caliper bridge to accommodate a large protrusion for passing the pin. On the other hand, in the pad assembly according to the present invention described above, such a recess may be very small. The bridge can therefore be made more compact and stronger.

[Brief explanation of the drawing]

FIG. 1 is a fragmentary side view of one type of friction pad assembly according to the present invention. FIG. 2 is a sectional view of the protruding portion of the assembly shown in FIG. 1; FIG. 3 is a cross-sectional view similar to FIG. 2, but showing another type of assembly. FIG. 4 is a detailed fragmentary view showing the means for retaining the spring of yet another type of assembly. 1...
... Back plate, 2 ... Friction material, 4 ...
・Anti-rattling spring, 5...Curved portion, 8...
-Protrusion, 11, 18... recess, 16... lip, 17... notch.

Claims (1)

Claims: 1. A backing plate having front and rear surfaces, a top edge, and two side edges; a friction material attached to the front side of the backing plate; from the top edge of the backing plate; a protrusion extending upward; and a rattle that elastically engages with a guide attached to the protrusion to prevent the back plate to which the friction material is attached from rattling against the guide of the back plate; In a friction pad assembly including a prevention spring: the protrusion 8 has a pair of laterally spaced recesses 11 between which the central abutment of the protrusion 8 is arranged. A pair of side abutting portions of the protrusion 8 are defined on the lateral outer sides of the pair of recesses 11; It is attached to the protrusion 8 by a curved portion 5, which extends through the pair of recesses 11 and meshes with the central abutment and side abutments: friction. pad assembly. 2. The curved portion 5 of the anti-rattle spring has: a central portion positioned between the pair of recesses 11 while being pressed against the protrusion 8 so as to engage with the central contact portion; two lateral portions extending laterally from each end of said central portion through each of a pair of recesses 11; and engaging said lateral abutments of said protrusion 8; 2. A friction pad assembly according to claim 1, comprising: two end portions extending laterally outwardly from each of the ends. 3. Each of the side abutting portions has a notch 17 for accommodating the anti-rattle spring, and the anti-rattle spring passes over the rear surface of the back plate 1 along the notch. 3. The friction pad assembly of claim 2, wherein the friction pad assembly extends laterally. 4. A recess 18 is opened at the side edge of the protrusion,
Friction according to claim 1 or 2, characterized in that the side abutment is formed by a lip (16) defining a small opening of the recess (18). pad assembly. 5 said protrusion 8 is centrally located on said top edge and said anti-rattle spring has an arm 6 extending from said curved portion 5, said arm 6 extending away from said top edge and toward said back plate. 5. A friction pad assembly according to any one of claims 1 to 4, wherein the friction pad assembly extends towards said side edge of the friction pad assembly.