JPH08121507A - Floating caliper type disk brake device - Google Patents

Abstract

PURPOSE: To reduce the number of a parts and improve assembling property by interposing a pair of pin members having elastic property in a rotor circumferential direction between both opposing surfaces of both arms part of a torque receiving member, and guiding the sliding of a friction pad and a caliper to the torque receiving member. CONSTITUTION: A floating caliper type disk brake device is provided with a torque receiving member 10 whose arm parts 12 are provided on both side of circumferential direction of a rotor 60, a caliper 20 which is extendedly provided from a base part and in which a reaction force tooth 22 is formed crossing a part of the outer circumference of the rotor 60, and a pair of friction pads 40, 50 whose inner side is fitted to a piston and outer side is fitted to the reaction force tooth 22 of the caliper 20 and which are friction-fit to the rotor 60 by holding and compressing the rotor 60 by pushing and pressing force of the piston. Both arms parts 12, 12 surfaces of the torque receiving member 10 are opposed to each other while having a clearance between both side surface of the back plate of the friction pads 40, 50 and both the arms parts 12, 12, a pair of pin members 30, 35 having at least elasticity in the circumferential direction of the rotor 60 are interposed between both opposing surfaces, and the sliding in the rotor axial direction of the friction pads 40, 50 and the caliper 20 are guided to the torque receiving member 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake.

[0002]

2. Description of the Related Art Conventionally, according to Japanese Patent Publication No. 2-5934, FIG. 3 and FIG. As shown in 6,
The back plates 43, 44 with friction pads are pressed by the spring member 45 having the leg portions 48 in the rotational advancing direction toward the curved sliding track 41. The spring member 45 applies thrust to each of the back plates 43 and 44 with friction pads toward the outer side in the radial direction and toward the contact portion on the opposite side. The force applied to each pad-back plate in the radial direction is the holding pin 4
6 exerts a reaction force. The retaining pin 46 is prevented from moving in the radial direction by the complementary shaped portion of the anchor bracket and by the retaining clip 47 in the axial direction.

That is, both friction pads are restricted from moving in the rotor radial direction by the curved sliding track 41 (torque receiving surface) and the holding pin 46, and are guided to slide in the rotor axial direction. Both friction pads are pressed by the spring member 45 toward the curved sliding track 41 and outward in the radial direction of the rotor.

[0004]

Problems to be Solved by the Invention The conventional device has the following problems. <A> Since the holding pin that regulates the movement of both friction pads and guides the sliding and the spring member that presses the friction pads are separately required, the assembling property is complicated. <B> Since the spring member only pushes the friction pad to one side in the rotor circumferential direction (toward the curved orbit), when the rotor rotates in the reverse direction (for example, when retreating),
The anchor bracket and the curved sliding track of the friction pad are separated from each other, and the sliding track 42 on the opposite side comes into contact with each other to generate a crawl sound (contact sound). Further, when the brake is released, the pressing force of the spring member causes a crawl noise on the curved sliding track. <C> Since the friction pad slides with one side being guided by the curved sliding track (torque receiving surface) and the other side being guided by the holding pin, respectively, the friction pad is different due to the difference in sliding resistance (friction area and friction coefficient). It does not move perpendicularly to the rotor sliding surface and either one of the rotor circumferential direction comes into contact with the rotor at the start of braking, or the other end does not return after releasing the brake, causing uneven wear of the friction pad and dragging. , Cause noise.
In particular, the curved sliding track has a large contact area, and the sliding resistance becomes large when rust occurs. <D> Due to the difference between the left and right sliding track shapes, the inner back plate and the piston, and the connecting means of the outer back plate and the fingers of the caliper housing, the pads for the left and right wheels cannot be shared. Each is a separate part.

[0005]

An object of the present invention is to solve the above problems and to improve the assemblability by reducing the parts of the floating caliper type disc brake device.

[0006]

According to the present invention, a piston slides in a torque receiving member having arms parallel to the rotor axis on both sides in the rotor circumferential direction and at least one cylinder hole bored in the base. A caliper that is housed so that it can be accommodated, extends from the base, and has reaction pawls that partially extend over the outer circumference of the rotor, the inner side engages the piston, and the outer side engages the reaction pawls of the caliper. In a floating caliper type disc brake device comprising a pair of friction pads for frictionally engaging the rotor by pressing the rotor with a pressing force of the piston, a torque receiving device is provided with a gap between both side surfaces of the back plates of the friction pads. The surfaces of both arm portions of the member are opposed to each other, and a pair of pin members having elasticity at least in the rotor circumferential direction are interposed between the opposed surfaces, and the friction pad and the rotor shaft of the caliper with respect to the torque receiving member. In a floating caliper type disc brake device, characterized in that for guiding the sliding direction.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. <A> Outline of Floating Caliper Type Disc Brake Device (FIGS. 1 and 2) A front view and a plan view showing a partial cross-sectional view of the floating caliper type disc brake device are shown in FIGS. 1 and 2, respectively. The floating caliper type disc brake device includes a torque receiving member 10
It is fixed to the vehicle body by the mounting hole 11 of. The torque receiving member 10 is provided with a pair of arm portions 12 that straddle a part of the outer periphery of the rotor 60 and are parallel to the rotor axis. A pin member 30 abuts on each arm 12 in parallel with the axis of the rotor 60.

The caliper 20 has a cylinder hole 24 bored in the base portion 21, and a piston 25 is slidably accommodated therein. A reaction force claw 22 is formed on the caliper 20 so as to extend from the base portion 21 and cross a part of the outer circumference of the rotor 60. An inner pad 40 (inner friction pad) engages with the piston 25 on the inner side (inner side) of the rotor 60. An outer pad 5 is provided on the outer side (outer side) of the rotor 60.
0 (the outer friction pad) engages the reaction force pawl 22. Each friction pad slidably contacts the pin member 30.

In this operation, when the piston 25 is pushed from the inner side to the rotor 60 side by the brake fluid pressure, the reaction force causes the reaction force claw 22 to move from the outer side to the rotor 60 side.
As a result, the inner pad 40 slides along the pin member 30 from the inner side to the rotor 60 side, and the outer pad 5
0 slides from the outside along the pin member 30 toward the rotor 60 side, and the friction pads sandwich the rotor 60 from both sides.

<B> Torque Receiving Member (FIGS. 1 and 2) The torque receiving member 10 is provided with a mounting hole 11 on one side of the rotor 60.
Attached to the car body by. Torque receiving member 10
Has a pair of arm portions 12 that straddle a part of the outer circumference of the rotor 60 and are parallel to the rotor axis. The inner sides of the both arm portions 12 face the side surfaces of the back plates 42 and 52 of the friction pad with a gap therebetween and form the torque receiving surface 14. Torque receiving surface 1
A groove 13 having a substantially V shape is formed in a part of the groove 4.

<C> Caliper (FIGS. 1 and 2) The caliper 20 has a base portion 21 in which a cylinder hole 24 is formed on one side of the rotor 60, and the caliper 20 straddles a part of the outer periphery of the rotor 60. It has a reaction force claw 22. A cup-shaped piston 25 having a piston inner hole 26 is slidably fitted in the cylinder hole 24. Cylinder hole 24
Is liquid-tightly defined by the piston seal 27, and when the brake fluid is introduced from the inflow port 29, the piston 25 moves out from the cylinder hole 24. A dust boot 28 is attached to the opening side of the cylinder hole 24 and the end of the piston to prevent dust and the like from entering. A pair of reaction claws 22 is formed on both sides in the circumferential direction of the rotor 60, and an engagement hole 23 for engaging an engagement protrusion 53 of a back plate 52 of the outer pad 50 is formed at the tip of the reaction claw 22. It There may be two or more cylinder holes 24 and pistons 25, and the reaction force pawl 22 may also be
Or there may be three or more.

<D> Friction Pad (FIG. 2) In the pair of friction pads, the inner pad 40 and the outer pad 50, the friction materials 41 and 51 are integrally formed on the back plates 42 and 52, bonded, riveted, or used together. It is fixed by the means. Both side surfaces of each of the back plates 42 and 52 face the torque receiving surface 14 formed on the arm portion 12 of the torque receiving member 10 with a gap therebetween, respectively, and further face the groove 13 of the arm portion to form a substantially V shape. Grooves 43 and 53 are formed.

An engaging projection 43 is formed on the back surface of the back plate 42 of the inner pad 40 to engage with the piston inner hole 26. The inner surface of the inner pad 40 is made of a spring material by caulking the engaging projection 43, bolting or the like. The pad clip 44 is attached. As a result, the piston 25 and the inner pad 40 are supported so that they can slide integrally.

Similarly, engaging projections 53 are formed on the back surface of the back plate 52 of the outer pad 50 at positions facing the engaging holes 23 of the pair of reaction claws 22, respectively. The outer pad clip 54 is attached and the tip of the clip is locked to the reaction force claw 22. This allows
The reaction claw 22 and the outer pad 50 are supported so that they can slide together.

<E> Pin Member (FIGS. 1 to 3) The pin member 30 is formed by winding a leaf spring material into a substantially cylindrical shape, and the mating portion forms the split groove 32. The liner portion 33 extends from the cylindrical portion 31 and is inserted into the torque receiving surface 14. Further, the liner portion 33 is extended and bent along the upper surface of the arm portion 12 to form a mounting portion 34. Then, the mounting portion 34 is fixed to the arm portion 12 with a mounting bolt 35. Further, both ends of the pin member 30 are tapered so that the groove 13 on the arm and the grooves 43, 5 on the side surfaces of the back plates 42, 52 are formed.
It is easy to insert between 3 and. As the material of the pin member 30, it is preferable to use a non-rust material such as stainless steel.

<F> Other structure of pin member (FIGS. 4 to 7) Instead of the liner portion 33 of the pin member 30 and the mounting portion 34 extending therefrom, the pin member 30 is attached to one end of the cylindrical portion 31 as shown in FIG. Part 34
May be extended. Then, the mounting portion 34 is fixed to the side surface of the arm portion 12 with a mounting bolt 35. Alternatively, as shown in FIG. 5, the retaining projections 36 are provided at both ends of the cylindrical portion 31 so that the pin member 30 is provided with the groove 13 of the arm portion and the grooves 43, 53 of the back plates 42, 52.
Movement of the rotor 60 in the axial direction may be restricted so as not to come off.

Instead of a circular cross section of the cylindrical portion 31,
It may be formed in an oval shape as shown in FIG. In that case, the long side is set in the radial direction of the rotor 60, and the split groove 3 is formed on one side of the short side.
2 is formed and arranged in the rotor circumferential direction, the rigidity in the rotor radial direction is increased to secure vibration resistance, and at the same time, the rigidity in the rotor circumferential direction is decreased to facilitate bending of the pin member 30 and push the friction pad. Keep the pressure moderate so that the friction pad is centered between the arms 12. Alternatively, the cross-sectional shape of the cylindrical portion 31 may be bent into an S shape as shown in FIG. 7 to further increase the rigidity in the rotor radial direction and reduce the rigidity in the rotor circumferential direction.

[0018]

According to the present invention, the following effects can be obtained. <A> Since the pin member that guides the sliding of the friction pad and the caliper in the rotor axis direction is inserted with elasticity.
There is no need for a separate spring member to press the friction pad,
Easy to assemble. <B> A pair of elastic pin members are inserted between both side surfaces of the back plate of the friction pad in the circumferential direction of the rotor and the arm portion facing the both sides to form a gap between the friction pad and both arm portions on both sides. Since it has been dispersed in, the amount of movement of the friction pad during braking is reduced,
It is possible to prevent the generation of cronks. <C> Since the pair of pin members are arranged on both sides of the back plate of the friction pad in the rotor circumferential direction, the sliding resistances on both sides of the friction pad are equal. As a result, the friction pad moves perpendicularly to the rotor sliding surface, so uneven wear, dragging, and squeaking can be prevented. <D> Since the pin member is made of stainless steel which is a non-rust material, the sliding resistance can be further stabilized. <E> Since both friction pads on the left and right wheels can be used in common,
The number of parts can be reduced.

[Brief description of drawings]

FIG. 1 is a front sectional view of a floating caliper type disc brake device of the present invention.

FIG. 2 is a plan sectional view of a floating caliper type disc brake device of the present invention.

FIG. 3 is a perspective view of a pin member.

FIG. 4 is a mounting view of another pin member.

FIG. 5 is a mounting view of still another pin member.

FIG. 6 is a sectional view of another pin member.

FIG. 7 is a sectional view of still another pin member.

Claims (3)

[Claims] 1. A torque receiving member having arm portions parallel to the rotor axis on both sides in the rotor circumferential direction, and a piston slidably accommodated in at least one cylinder hole bored in the base portion and extending from the base portion. The caliper provided with reaction force claws that partially extend over the outer circumference of the rotor, the inner side engages with the piston, the outer side engages with the reaction force claw of the caliper, and the rotor is pressed by the piston. In a floating caliper type disc brake device including a pair of friction pads that are pressed and frictionally engaged with each other, the surfaces of both arm portions of the torque receiving member are opposed to each other with a gap between both side surfaces of the back plates of the friction pads. A pair of pin members having elasticity in at least the circumferential direction of the rotor are interposed between the opposing surfaces to guide the torque receiving member to slide the friction pad and the caliper in the rotor axial direction. Floating caliper type disc brake device. 2. The floating caliper type disc brake device according to claim 1, wherein the surfaces of both arm portions of the torque receiving member are opposed to each other with a gap between both side surfaces of the back plates of the friction pads. A floating caliper type disc brake device, wherein a liner portion formed of a surface and extending from the pin member is inserted into the torque receiving surface. 3. The floating caliper type disc brake device according to any one of claims 1 and 2, wherein the pin member is configured to have high rigidity in a rotor radial direction and low rigidity in a rotor circumferential direction. Floating caliper type disc brake device.