JP2749911B2 - Disc brake - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake, and more particularly, to a disc brake in which an outer pad is supported in a fitted state between a pair of claws of a caliper.

"Prior art" As a conventional disc brake, for example,
There is one described in No. 75 publication. This disc brake is a disc brake called a fist type in which a cylinder (a brake actuating device in the name of the publication, hereinafter the name of the publication is indicated in parentheses) is integrally formed on a caliper straddling the disk. A hole is formed in the claw (counteractuator) of the caliper arranged on the side,
A protrusion integrally formed on the back of the back pad (pad support plate) of the outer pad (brake shoe) is supported in a fitted state, and the torque acting on the outer pad during braking is transmitted from the protrusion to the pawl to the caliper. It is designed to be supported. When such a disc brake is applied to a pin-sliding type, the outer pad is supported by the caliper, so that the carrier can be simplified and sheet metal can be formed, thereby reducing costs.

Further, in the case of the disc brake disclosed in the above publication, the outer pad is restricted in movement in the fitting direction by a retainer spring (holding spring), and the upper end surface is formed in an arcuate surface. The disk is prevented from rotating by being brought into contact with the processing surface (support surface) in the disk path portion.

[Problems to be Solved by the Invention] By the way, when the upper end surface of the outer pad is brought into contact with the machined surface of the disk path portion, the two arc surfaces come into surface contact in a relatively wide range. It is necessary to consider an error, and for this reason, it is necessary to set the dimensions within an error range where a slight gap is generated. On the other hand, if the gap becomes large, so-called rattling occurs, and the load on the retainer spring increases. Therefore, cutting of both arc surfaces requires high machining accuracy under strict dimensional control.

SUMMARY OF THE INVENTION The present invention effectively solves the above-mentioned problems, and has an object to facilitate processing for preventing a rotation of an outer pad.

[Means for Solving the Problems] In a disc brake of the present invention, a caliper that straddles a disc is provided with a cylinder that drives an inner pad and a pair of claws that support the back of an outer pad, facing each other via the disc. In addition, an arc-shaped torque receiving surface forming a circular space between the two claws, and an arc-shaped stopper surface formed by machining the tip of the claw concentrically with the machining surface of the disc path portion of the caliper. Are formed integrally on the back of the back metal of the outer pad, and a protruding portion that is supported in the circular space portion in a fitted state and a locking convex portion that abuts against the arc-shaped stopper surface are integrally formed. And

[Operation] In the disc brake of the present invention, the outer pad is prevented from rotating by bringing the stopper surface of the claw tip into contact with the locking projection of the outer pad. In this case, the contact surface between the two is limited to a small range between the claw tip and the locking projection, and the processing of the stopper surface can be performed simultaneously with the processing surface of the disk path in the same step. Things.

Hereinafter, an embodiment of a disc brake according to the present invention will be described with reference to the drawings.

In this disc brake, a caliper 2 straddling the disc 1 is provided with a cylinder 4 for driving an inner pad 3 and two claws 6 for supporting the back of the outer pad 5.
The inner pad 3 is supported by being fitted to the carrier 7 formed in the shape of a flat plate with the both ends 3a, 3a fitted into the facing grooves 7a, 7a of the carrier 7. The outer pad 5 has two projections 9 integrally formed on the back of the back metal 8 supported in a fitted state in a circular space 10 formed between the claws 6 of the caliper 2.
The caliper 2 can move along a bolt 11 and a pin 12 fixed to the carrier 7. Also,
A piston 13 is slidably housed in the cylinder 4, and the inner pad 3 is driven by the piston 13.

The surface of the circular space 10 where the claws 6 face each other, that is, the torque receiving surface 15, is connected to the cylinder 4 of the caliper 2.
Are formed on at least an arc surface having the same curvature as the inner peripheral surface of the cylinder 4, and are arranged on the same axis as the cylinder 4. Therefore, when machining the inner peripheral surface of the hole of the cylinder 4, machining can be performed with the same cutting tool.

On the other hand, the two projecting portions 9 are arranged at right and left intervals so as to be in contact with the torque receiving surfaces 15 of the claws 6 one by one. Is formed on the inclined surface 18 so that both side surfaces between the arc surface 16 and the opposing surface 17 between the projections 9 gradually approach the center of the outer pad 5. Is formed.

In addition, locking projections 19 are formed integrally with the projections 9 so as to be continuous from the lower inclined surfaces 18 of both projections 9, and these locking projections 19 abut against the tips of the claws 6 of the caliper 2. A stopper surface on which the tip of the claw 6 stops the outer pad 5 from rotating.
It is 20. The contact surface between the locking projection 19 and the stopper surface 20 of the claw 6 is concentric with the center of curvature O of the processing surface 21a of the disk path portion 21 between the cylinder 4 of the caliper 2 and each claw 6. It is formed on an arc surface.

Further, a mold hole 23 that penetrates the back metal 8 is provided at a position outside the both protrusions 9 on the outer pad 5,
Part of the friction member 24 penetrates into the mold hole 23 in a penetrating state.

On the other hand, between the outer pad 5 and the claw 6 of the caliper 2,
A retainer spring 25 for restricting the movement of the outer pad 5 in the fitting direction is provided.
Are formed by pressing a leaf spring to form a fixed portion 27 which is engaged with a concave portion 26 between both projecting portions 9 of the outer pad 5 and a pair of arm portions 28 which are in contact with the rear surfaces of the claws 6 of the caliper 2.
It is composed of The fixing portion 27 is formed in a planar shape as a whole, and protrudes outward to form four locking pieces.
29 are formed, the leading ends of the locking pieces 29 are raised at the same angle as the respective inclined surfaces 18 of the projecting portions 9, and the leading ends of the respective rising portions 30 elastically contact the inclined surfaces 18. It is configured to be fixed in the concave portion 26. In this case, in the direction in which the retainer spring 25 falls off, the leading end of the rising portion 30 bites into the inclined surface 18, so that it becomes difficult to come off.

In the disc brake thus configured, the torque acting on the friction member 24 at the time of braking is transmitted from the protrusion 9 of the caliper 2 to the torque receiving surface of the claw 6 via the back metal 8 fixed to the friction member 24. It is transmitted to 15. The torque is transmitted to apply a rotational force to the outer pad 5, but the outer pad 5 is prevented from rotating due to the contact between the locking projection 19 and the stopper surface 20 of the claw 6.

Since the stopper surface 20 is formed concentrically with the processing surface 21a of the disk path portion 21, both processing can be performed at the same time. That is, the processing surface 21a of the disk path portion 21 is provided in the vicinity of the claw 6 on both sides in the circumferential direction of the disk 1, and this portion must be in the direction of decreasing the wall thickness conventionally when the product is manufactured by dimensional control of the casting itself. For example, there is a possibility that the upper portion of the outer pad 5 hits and is not incorporated. On the other hand, since the rigidity of this portion is sufficiently required, a method of performing a cutting process is employed. Therefore, by using a cutting blade having a shape indicated by a chain line X in FIG. 2 at the time of cutting the processing surface 21a of the disk path portion 21, the stopper surface 20 can be processed at the same time.

In this case, since the contact surface between the outer pad 5 and the caliper 2 is limited to a small range between the locking projection 19 protruding from the projection 9 and the tip of the claw 6, these processing errors can be reduced. Therefore, the contact state can be reliably ensured without generating a gap or the like.

In the case of the illustrated example, as described above, the torque receiving surface 15 of the pawl 6 of the caliper 2 and the hole of the cylinder 4 can be machined in the same process. Can be fully exhibited.

Note that, in the present invention, the projections and the locking projections of the outer pad do not necessarily have to have a continuous structure,
You may make it project separately.

[Effects of the Invention] As is apparent from the above description, according to the disc brake of the present invention, the contact surface for stopping the rotation of the outer pad has a small area between the claw tip of the caliper and the locking projection of the outer pad. Therefore, it is possible to improve the processing accuracy of these, to prevent the occurrence of gaps, etc., and to form the stopper surface at the tip of the claw in an arc surface concentric with the processing surface in the disk path. Therefore, these can be processed simultaneously in the same step, and therefore, there is an effect that the processing can be facilitated and the manufacturing cost can be reduced.

[Brief description of the drawings]

The drawings show an embodiment of the disc brake according to the present invention. FIG. 1 is a partially cutaway front view, and FIG.
FIG. 3 is a vertical cross-sectional view taken along the line II-II, FIG. 3 is a top view partially in section, and FIG. 4 is a rear view. 1 ... disk, 2 ... caliper, 3 ... inner pad, 4 ... cylinder, 5 ... outer pad, 6 ... claw,
7 Carrier, 8 Back metal, 9 Protrusion, 10 Space, 11 Bolt, 12 Pin, 15 Torque receiving surface, 16 Arc surface, 17 Opposing surface , 18 …… Slope, 19…
... locking projection, 20 ... stopper surface, 21 ... disk path part, 21a ... processing surface, 23 ... mold hole, 24 ... friction member, 25 ... retainer spring, 26 ... recess, 27 ... … Fixed part, 28… Arm part, 29… Locking piece, 30… Start-up part.

Claims (1)

(57) [Claims] A caliper straddling a disk is provided with a cylinder for driving an inner pad and a pair of claws for supporting a back portion of an outer pad facing each other via a disk. An arc-shaped torque receiving surface that forms a circular space portion therebetween, and an arc-shaped stopper surface formed by processing the tip of the claw concentrically with the processing surface of the disc path portion of the caliper are formed, and on the back of the back metal of the outer pad. A projecting portion supported in the circular space portion in a fitted state,
A disc brake, characterized in that a locking projection contacting an arc-shaped stopper surface is formed integrally.