JP2000213571A - Disc brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably support large brake torque by forming a hole piercing in the axial direction of a rotor, in a caliper claw, while providing a back plate constituting an outer pad, with a protruding part to be fitted into the hole, and allowing the tip part of a base part fixed to the back plate, to abut on the inner peripheral surface of the hole under elastic energization. SOLUTION: At the time of braking, pressure oil is fed into a cylinder 15, and an inner pad 4 is pressed to the inner side face of a rotor by a piston 21. With its reaction, a caliper 9 is displaced along each guide rod 11, and a caliper claw 13 presses an outer pad 14 to the outer side face of the rotor 1. The rotor 1 is therefore clamped by linings 7a, 7b of both pads 4, 14 to brake. Brake torque applied to the outer pad 14 at this time is transmitted to the caliper claw 13 through engagement between a protruding part 17 formed at a back plate 5b of the outer pad 14, and a circular hole 16 formed in the caliper claw 13, to support brake torque to a suspension device through a support 2. Large brake torque can therefore be supported.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caliper floating type disc brake, which is a small and lightweight disc brake used for braking an automobile, which can be easily installed in a limited space and whose pad replacement work is easy. It relates to improvement of brakes.

[0002]

2. Description of the Related Art Disc brakes are widely used for braking automobiles. Disc brakes with a structure that has been generally used in the past have a support provided so as to straddle a rotor that rotates with the wheels,
A pair of pads provided so as to sandwich the rotor is supported so as to be displaceable in the axial direction of the rotor. At the time of braking, the pair of pads is pressed against both side surfaces of the rotor by a piston built in a caliper supported by the support.

In contrast to such a general disc brake, for example, a caliper floating disc brake as disclosed in Japanese Patent Publication No. 63-653 is known as one (called an inner side, in the width direction of an automobile). Only the pad (center side) is supported by the support. The other pad (called the outer side, which is the outer side in the width direction of the vehicle) is supported by a caliper that is displaceably supported in the axial direction of the rotor with respect to the support.

The above-mentioned caliper floating type disc brake can be easily installed in a limited space because the pad on the outer side is not supported by the support. In addition, by reducing the unsprung load, it is possible to improve the performance of the automobile, mainly on the riding comfort performance, running performance, fuel consumption performance and the like. Further, the maintenance management work becomes easy, for example, the pad can be replaced while the support and the rotor are kept as they are.

By the way, when the disc brake is actuated, a force (brake torque) for moving each pad in the rotational direction of the rotor is exerted on each pad by friction between a lining constituting each pad and a side surface of the rotor.
And a moment to rotate these pads about their respective central portions. In the case of a disc brake having a structure in which the above-mentioned brake torque applied to a pair of pads is supported by a support, the rotation of these two pads is prevented by the engagement between the back plates of these two pads and the support. On the other hand, Japanese Patent Publication No. 63-6
In the case of a disc brake as described in JP-A-53-53, it is necessary to use a caliper to support the brake torque applied to the outer pad and to prevent the pad from rotating.

For this purpose, a circular hole formed in the caliper claw is fitted with a convex portion formed on the back surface of the back plate constituting the pad on the outer side. By engaging the through-hole formed in the portion of the back plate near the outer periphery with the pin supported by the caliper, the outer-side pad is prevented from rotating during braking, and before the disc brake assembly is completed. The pad on the outer side is prevented from falling off from the caliper claw.

[0007]

[Problems to be Solved by the Invention]
In the case of the invention described in Japanese Patent No. 653, the rotation of the pad on the outer side and the prevention of falling off are prevented by the engagement between the through hole formed in the back plate constituting the pad and the pin supported by the caliper. This causes a complicated structure and a high cost. In addition, the provision of the through holes and the pins increases the portion of the component parts of the disc brake that project diametrically outward from the outer peripheral edge of the rotor, making it difficult to reduce the size and weight. An object of the present invention is to provide a small and lightweight caliper floating type disc brake that can be manufactured easily and at low cost without such disadvantages.

[0008]

According to the present invention, there is provided a disk brake which is supported by a suspension and rotates together with wheels during traveling, a support supported and fixed to the suspension, and a rotor provided on one side of the rotor. A first pad supported on the support so as to freely displace the rotor in the axial direction, a caliper supported on the support so that the rotor can be displaced in the axial direction, and a tip provided at the tip of the caliper. Based on the engagement of the caliper claw that is continuous with the bridge portion and the bridge portion straddling the rotor and the support without engaging the caliper claw,
A second pad that is prevented from being displaced in the rotation direction of the rotor, a cylinder formed in the caliper in the axial direction of the rotor, and having one end opened toward one side surface of the rotor; Oil-tightly fitted inside this cylinder,
A piston is provided which presses the first pad against one side of the rotor by being displaced toward one side of the rotor as the pressure oil is fed into the cylinder.

In particular, in the disc brake of the present invention, a hole formed in the caliper claw so as to penetrate in the axial direction of the rotor and a back plate constituting the second pad are provided. A projection is fitted in the hole, and an elastic material is fixed to the back plate, the base of which is fixedly connected to the back plate, and the distal end of which elastically contacts the inner peripheral surface of the hole. The rotation of the second pad is prevented based on the engagement between the outer peripheral edge of the back plate constituting the second pad and the inner peripheral surface of the caliper.

[0010]

In the case of the disk brake of the present invention constructed as described above, the braking torque applied to the second pad at the time of braking is determined by the projection formed on the back plate of the second pad and the caliper claw. By being engaged with the hole, it is transmitted to the caliper claw, further transmitted to the support, and supported by the suspension device. When a moment about the hole is applied to the pad based on the friction between the lining and the rotor constituting the second pad, the outer peripheral edge of the back plate and the inner peripheral surface of the caliper engage. This prevents the second pad from rotating. Further, based on the engagement between the distal end edge of the elastic material whose base end is fixedly connected to the convex portion and the inner peripheral surface of the hole, before the assembly of the disc brake is completed, the second To prevent the pads from falling off.

[0011]

1 to 7 show an embodiment of the present invention. The disk-shaped rotor 1 is supported by a suspension device (not shown) and rotates with the wheels during traveling. On the other hand, the support 2 is supported and fixed to the suspension device. That is, the support 2 is formed in a thick plate shape from a metal material having sufficient rigidity such as cast iron, and screw holes 3 and 3 formed at two positions on the inner diameter side end are provided with the suspension device. The bolt inserted through the mounting portion is screwed together and further tightened to support and fix the suspension. The support 2 is provided with an inner pad 4 as a first pad, as shown in FIG. 6, in the axial direction of the rotor 1 (front and back directions in FIG. 1, left and right directions in FIGS. 2, 4 and FIG. 3). (Up-down direction).

That is, the support 2 is formed in a substantially U-shape with the outer diameter side of the rotor 1 opened, and supports the back plate 5a constituting the inner pad 4 at the mutually opposing portions of the intermediate portion. Engaging grooves 6, 6 are formed. On the other hand, the inner pad 4 is
a is provided with a lining 7a attached to one side thereof. The inner pad 4 is formed by engaging the engagement protrusions 8 formed on both ends of the back plate 5a with the engagement grooves 6 via anti-rattle springs 22. Only the axial displacement of the rotor 1 is freely supported on the support 2. The inner pad 4 faces the inner side surface, which is one side surface of the rotor 1, while being supported by the support 2 in this manner.

[0013] Also, among the supports 2, the rotor 1
A caliper 9 is supported on the portion near the outer diameter so that the rotor 1 can be freely displaced in the axial direction. That is, guide cylinder portions 10 and 10 having a bottomed cylindrical shape are provided at two positions on the opposite side to the outer diameter portion of the support 2 in the circumferential direction (left and right directions in FIGS. 1 and 3). On the other hand, at two positions on the opposite side of the caliper 9 in the circumferential direction, the guide rods 1 are respectively provided.
The base ends of 1 and 11 are connected and fixed. By inserting the distal ends of these two guide rods 11 into the respective guide cylinder parts 10, 10, the caliper 9 is formed.
Is supported on the support 2 so that the rotor 1 can be freely displaced in the axial direction. Each of the guide rods 1
At the portion near the base end of 1, 1
The parts exposed from 0, 10 are bellows 12,
Covered by 12.

At the tip (right end in FIG. 2, lower end in FIG. 3, left end in FIG. 4) of the caliper 9 as described above, a bridge portion 23 straddling the rotor 1 and a bridge portion 23 A caliper claw 13 that is continuously bent inward in the diameter direction of the rotor 1 is provided. Then, on the inner surface of the caliper claw 13, a second pad, FIG.
The outer pad 14 shown in FIG. That is,
At the center of the caliper claw 13, a cylinder 15 described later is attached.
In a concentric, inner diameter R ₁₆ is the inner diameter R ₁₅ of the cylinder 15
Hereinafter, one circular hole ₁₆ satisfying (R ₁₆ ≦ R ₁₅ ) is formed. This circular hole 16 constitutes the caliper claw 13,
The entire periphery is surrounded by a metal material such as cast iron, and the inner peripheral surface is continuous over the entire periphery. On the other hand, on the back surface of the back plate 5b constituting the outer pad 14, one convex portion 17 that fits into the circular hole 16 without play is formed. In the illustrated example, the convex portion 17 is formed in an oval shape, and the radius of curvature of the arc portions that are concentric with each other and that are present on the opposite side with respect to the rotation direction of the rotor 1 It is slightly smaller than the radius of curvature (= R _16/2).

The projection 17 is fitted in the hole 16. In the state where the convex portion 17 is fitted in the circular hole 16 in this manner, the projections 18 formed on both ends of the outer peripheral edge of the back plate 5b with respect to the rotation direction of the rotor 1 form the inner periphery of the caliper 9. Abut or close to the surface. Therefore, when the projections 17 are fitted in the holes 16 as described above, the outer pad 14 moves in the rotational direction of the rotor 1 due to the engagement between the projections 17 and the holes 16. In addition to preventing the outer pad 14 from being disturbed, the outer pad 14 is formed on the basis of the engagement between one of the projections 18 and 18 (depending on the rotation direction of the rotor 1) and the inner peripheral surface of the caliper 9. Rotation around the circular hole 16 is prevented.

A base end of a leaf spring 19, which is an elastic material, is fixedly connected to the center of the convex portion 17. That is, the projection 20 formed at the center of the convex portion 17 is
The plate spring 19 is fixedly connected to the central portion of the convex portion 17 by caulking the projection 20 to the peripheral portion of the through hole while being inserted into the through hole formed at the base end of the base 9. . Both ends of the leaf spring 19 are bent in an arc shape so that the pushing operation into the circular hole 16 can be easily performed. The length of the leaf spring 19 in the free state is slightly larger than the inner diameter of the circular hole 16. Therefore, when the convex portion 17 is fitted in the circular hole 16, both ends of the leaf spring 19 elastically press the inner peripheral surface of the circular hole 16, and the convex portion 17 is pushed out of the circular hole 16. Inadvertently slipping out of the outer pad 1 from the caliper claw 13
4 is prevented from falling off.

Further, one cylinder 15 is formed in the caliper 9 along the axial direction of the rotor 1.
The cylinder 15 is closed at the back end (the right end in FIG. 4) and has a front end opening toward one side surface of the rotor 1. One piston 21 is fitted in the cylinder 15 in an oil-tight manner. The piston 21 is displaced toward the inner surface of the rotor 1 as the pressure oil is fed into the cylinder 15 through an oil supply port (not shown). Then, the inner pad 4 is pressed against the inner surface of the rotor 1.

In the case of the disk brake of the present invention having the above-described structure, pressure oil is fed into the cylinder 15 at the time of braking, and the inner pad 4 is pressed against the inner surface of the rotor 1 by the piston 21. Based on the reaction of the pressing force, the caliper 9 causes the guide rods 11, 11 to move the guide cylinders 10,
It is displaced inward while sliding with respect to 10. Based on this displacement, the caliper claw 13 is
4 is pressed against the outer surface of the rotor 1. As a result,
The rotor 1 has the inner and outer pads 4,
14, the pads 4 are held from both inside and outside.
Braking is performed on the basis of the frictional force acting between the linings 7 a and 7 b constituting the rotor 14 and both side surfaces of the rotor 1.

Based on the friction between the linings 7a, 7b and both side surfaces of the rotor 1, the two pads 4, 14 apply a torque directed to the rotation direction of the rotor 1, respectively.
A torque for rotating the pads 4 and 14 is applied. Of these, the support 2 supports the torque and moment applied to the inner pad 4 as in the case of a general disc brake.

On the other hand, the brake torque applied to the outer pad 14 is increased by the engagement between the convex portion 17 formed on the back plate 5b constituting the outer pad 14 and the circular hole 16 formed on the caliper claw 13. This caliper claw 13
And further transmitted to the support 2 and supported by the suspension device. The circular hole 16 is continuous over the entire circumference.
In other words, of the caliper claws 13, the protrusion 1
The portion surrounding 7 is continuous without interruption. For this reason, the rigidity of the portion of the caliper claw 13 supporting the convex portion 17 is sufficiently increased, so that a large brake torque applied to the outer pad 14 can be supported.
The lining 7b constituting the outer pad 14
When a moment about the circular hole 16 is applied to the outer pad 14 based on the friction between the outer pad 14 and the outer surface of the rotor 1, a pair of projections 18, 18 formed at both ends of the outer peripheral edge of the back plate 5b are formed. One of the protrusions 18 engages with the inner peripheral surface of the caliper 9. Then, the outer pad 14 is prevented from rotating further.

Further, based on the engagement between the distal end edge of the leaf spring 19 whose base end portion is fixedly connected to the convex portion 17 and the inner peripheral surface of the circular hole 16, before the assembly of the disc brake is completed, The outer pad 14 is prevented from falling off from the caliper claw 13. That is, in a state where the disc brake is assembled, the lining 7b constituting the outer pad 14 is closely opposed to the outer side surface of the rotor 1, so that the convex portion 17 does not fall out of the circular hole 16. On the other hand, in the state of assembling the disc brake, if no countermeasure is taken, the caliper claw 13
, The outer pad 14 easily falls off, which complicates the work of assembling the disc brake. In the present invention, such a trouble is prevented by providing an elastic material such as the leaf spring 19 or the like.

[0022]

Since the present invention is constructed and operates as described above, a small and lightweight caliper floating type disc brake which can be easily manufactured at low cost and which can be manufactured at low cost can be realized.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of an embodiment of the present invention.

FIG. 2 is a side view as viewed from the left side of FIG. 1;

FIG. 3 is a partially cut plan view seen from above in FIG. 1;

FIG. 4 is a sectional view taken along line AA of FIG. 1;

FIG. 5 is a sectional view taken along the line BB shown in a partially omitted state.

FIG. 6 is a perspective view of the inner pad as viewed from the back plate side.

FIG. 7 is a perspective view of the outer pad as viewed from the back plate side.

[Description of Signs] 1 rotor 2 support 3 screw hole 4 inner pad 5a, 5b back plate 6 engaging groove 7a, 7b lining 8 engaging convex part 9 caliper 10 guide cylinder part 11 guide rod 12 bellows 13 caliper claw 14 outer pad 15 Cylinder 16 Circular hole 17 Convex part 18 Projection 19 Leaf spring 20 Projection 21 Piston 22 Anti-rattle spring 23 Bridge part

Claims (1)

[Claims] 1. A rotor which is supported by a suspension and rotates together with wheels when traveling, a support which is fixedly supported by the suspension, and a displacement of the rotor in the axial direction on one side of the rotor. A first pad supported so as to be freely movable, a caliper supported by the support such that the rotor can be freely displaced in the axial direction, a bridge portion provided at a tip end of the caliper, straddling the rotor, and A second pad that is prevented from being displaced in the rotation direction of the rotor based on engagement with the caliper claw without engaging the support and the caliper claw continuing from the bridge portion; A cylinder formed in the axial direction of the rotor, one end of which is open toward one side surface of the rotor; In a disc brake having a piston that presses the first pad against one side of the rotor by being displaced toward one side of the rotor as the pressure oil is fed into the rotor, A hole formed so as to penetrate in the axial direction of the rotor, a back plate constituting the second pad, a protrusion fitted into the hole, and a base fixed to the back plate. And an elastic material having a tip portion elastically abutted against an inner peripheral surface of the hole. The elastic member has an outer peripheral edge of a back plate constituting the second pad and an inner peripheral surface of the caliper for engagement. A disc brake, wherein the rotation of the second pad is prevented.