JPH04109233U - Carripa body for vehicle disc brakes - Google Patents

Abstract

(57) [Summary] [Purpose] To improve pedal feel by suppressing the opening of the action section due to braking reaction force. To make a caliper body easy to mold and to have a shape that does not interfere with attachment to a vehicle body. [Structure] A disk radial direction line connecting the end walls 2g, 2g of the bridge portion 2c with the thrust center point O ₁ of the piston 8 and the thrust center point O ₁ and the center of the disk rotor 3 (not shown). Extend to the opposite side beyond the intersection line L ₂ perpendicular to L ₁ ,
It is made less susceptible to the opening force acting along the disk radial direction line _L1 .

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a disc brake installed in vehicles such as four-wheeled cars and motorcycles. For details, let's look at the rigidity of the caliper body used in this disc brake. Concerning improved structure.

0002

[Conventional technology]

The caliper body of disc brakes used in vehicles such as four-wheeled cars is The first acting part and the second acting part, which face each other with the scroter in between, are connected to the outside of the disc rotor. It is formed in a substantially U-shaped cross section connected by a bridge portion that spans the circumference, and has a first or second action. One of the parts is supported cantilevered by the vehicle body.

0003 In such a cantilever structure, one or both cylinders of the first and second acting parts When a braking action is performed by moving the piston inserted into the hole forward using hydraulic pressure, both A braking reaction force is generated that pushes the acting parts outward, and these acting parts support the top of the bridge part. Transform it so that it opens outward to a point. This deformation of the acting part moves away from the fulcrum of the opening deformation. The closer the disc is to the center, the larger the deformation becomes, and this deformation causes pressure fluid to flow into the caliper body. The piston stroke of the hydraulic master cylinder that supplies This can lead to a decrease in brake feeling.

0004 Therefore, for example, in Japanese Utility Model Application Publication No. 1-78736, the first and second acting parts are By connecting the end walls in the circumferential direction of the disk with tie bars and suppressing the opening of both working parts. , trying to improve brake feel.

[0005]

[Problem that the idea aims to solve]

However, in the above structure, the tie bar and caliper body are integrated, so the caliper body The overall shape of the Ripa body is large and complex, which not only makes molding difficult. Even when installing it on the vehicle body, it may not be possible to place it in a limited space.

[0006] Therefore, the present invention was designed to be easy to mold and not hinder installation on the vehicle body. , a vehicle that solves the above problems by improving rigidity without making major changes to the conventional shape. The purpose of this project is to provide a caliper body for disc brakes.

[0007]

[Means to solve the problem]

In accordance with the above-mentioned purpose, the first idea is to provide first effects that are opposed to each other with the disc rotor in between. and the second acting part are connected by a bridge part that spans the outer periphery of the disc rotor, and the first and the cylinder hole bored in one or both of the second action part, a piston, etc. In the caliper body of a vehicle disc brake in which a depressing member is inserted, the above-mentioned The end wall of the bridge portion in the disk circumferential direction is aligned with the center point of the thrust of the pad pushing member. Intersection line perpendicular to the disk radial line connecting the thrust center point and the center of the disk rotor be the same as or extend to the opposite side beyond this line of intersection.

[0008] In addition, in the second invention, the first action part and the second action part are opposite to each other with the disc rotor in between. The parts are connected by a bridge part that spans the outer circumference of the disc rotor, and the first and second actions are performed. A plurality of cylinder holes are arranged in parallel in the disk circumferential direction on one or both of the cylinders. A vehicle disc brake with a pad pushing member such as a piston inserted into the cylinder hole. In the caliper body, the end wall of the bridge portion in the disk circumferential direction is At the total thrust point of the pad pushing member, connect the total thrust point and the center of the disc rotor. The same as the line of intersection perpendicular to the radial direction of the disc, or beyond this line of intersection to the opposite side. Extend.

[0009] One cylinder hole on one side or one cylinder hole on both sides facing each other. In the two-pot facing type, the center of the cylinder hole is the thrust center point, and multiple cylinders In the multi-pot facing type, where the holes are arranged in the circumferential direction of the disk on one side or facing each other on both sides, , depending on the positions of the inner and outer circumferences of the cylinder holes, the distance between centers, and the hole diameter. The total thrust point is found in the enclosed area.

0010

[Effect]

The opening force applied to the caliper body due to the braking reaction force is located at the center of thrust or at the thrust force. Since it acts along the disk radial line passing through the measuring point, the end wall of the bridge part is At the center point or thrust total point, reach the intersection line perpendicular to this disk radial direction line. By extending the end wall of the bridge part and the vicinity of both acting parts connected to this end wall. As a result, the opening force is kept to an extremely small level, and at the same time, the rigidity is increased.

[0011]

【Example】

Hereinafter, a first embodiment of the present invention will be described based on FIGS. 1 and 2.

0012 The caliper body 2 used in the disc brake 1 is part of the disc rotor 3. The caliper bracket 4 is fixed to the vehicle body on the side via two sliding pins 5, 5. It is a pin slide type that is guided in the direction of the disk axis, and is placed across the disk rotor 3. The first acting part 2a and the second acting part 2b are connected by a bush that straddles the outer circumference of the disc rotor 3. It has a structure in which they are connected by a ridge portion 2c.

[0013] The first acting part 2a supported by the caliper bracket 4 has a cylinder hole 6 with a dial. It is provided with an opening on the scroller side, and a reaction claw 2 is provided on the second acting part 2b on the opposite side. d, and between the cylinder hole 6 and the reaction claw 2d, a pair of friction Pads 7, 7 are provided with the disc rotor 3 sandwiched therebetween. The cylinder hole 6 has a bottom. A cylindrical piston 8 is fluid-tightly and movably inserted into the cylinder hole 6 and the piston 8. The empty space defined between the bottoms of the hydraulic pressure chamber 9 is defined as the hydraulic pressure chamber 9. The hydraulic pressure chamber 9 is a known hydraulic pressure chamber (not shown). This hydraulic pressure chamber 9 is connected to the hydraulic master cylinder via the brake hose. When pressurized hydraulic fluid is supplied from the hydraulic master cylinder to Move the pad hole 6 forward toward the disc rotor, and insert one friction pad 7 into the disc rotor. 3, and then this reaction force moves the caliper body 2 toward the first acting part. Then, the reaction claw 2d presses the other friction pad 7 against the other side of the disc rotor 3. A braking action is performed.

[0014] The friction pad 7 includes a lining 14 that comes into sliding contact with the side surface of the disc rotor 3, and a cap. It is joined to the back plate 15 held by the liper body 2, and the upper side of both sides of the back plate 15 are provided with protruding tabs 15a, 15a, and the friction pad 7 is attached to the tabs 15a. , 15a are provided opposite to the ceiling opening 2e of the bridge portion 2c. 2f via a retainer 16, and a hanger pin 1 is attached to the upper center of the back plate 15. 7, the disk is suspended so as to be movable in the axial direction, and the above-mentioned ceiling opening is inserted. It is inserted and removed through part 2e.

In such a cantilever type caliper body 2, the opening force due to the braking reaction force is applied in the disk radial direction connecting the thrust center point _O1 of the piston 8 and the center of the disk rotor 3 (not shown). The deformation acts along the disc radial direction line L ₁ with the top of the bridge portion 2c on the line L ₁ as the fulcrum, and in the action portions 2a and 2b, this deformation acts more strongly as the distance from the fulcrum point approaches the center of the disk. In addition, when this opening force is viewed over the entire circumference with the thrust center point _O1 as the fulcrum, it is least likely to affect the disk radial direction line _L1 and the intersection line _L2 perpendicular to the disk radial direction line L1. , both end walls 2g, 2g of the bridge portion 2c are shaped to extend to the opposite side beyond this intersection line _L2 .

[0016] In this way, the end walls 2g, 2g of the bridge portion 2c are arranged on the side of the disk radial direction line L ₁ passing through the thrust center point O ₁ and at the intersection line L that is orthogonal to this disk radial direction line L ₁ . ₂ , the end walls 2g, 2g and the portions near the end walls of both the working portions 2a, 2b connected to the end walls 2g, 2g have an opening that acts along the disk radial direction line _L1. The influence of force becomes extremely small, and conversely, the cross-sectional area of the bridge portion 2c connecting the portions near the end walls of the acting portions 2a and 2b can be increased, and the rigidity can be increased. As a result, the amount of deformation of the first and second acting parts 2a and 2b is kept small, and at the same time, wear and tear such as metal fatigue on the end walls 2g and 2g, which are susceptible to the influence of opening force, is prevented as much as possible.

[0017] Figure 3 shows a second embodiment in which the present invention is applied to a multi-pot caliper body. Therefore, the first acting part 20a of the caliper body 20 has medium and small ・Large diameter cylinder holes 21a, 21b, 21c are arranged in parallel in the disk circumferential direction, and Pistons 22, 23, and 24 matching the respective diameters are inserted. Also, not shown In the second working part, the cylinder hole may be similarly opposed, or alternatively, the second working part may be arranged to face the cylinder hole in the same way. Similarly, a reaction claw may be provided.

[0018] Friction pad disposed between the disc rotor 3 and the cylinder holes 21a to 21c 25 connects the tabs 26a, 26a protruding from the upper sides of both sides of the back plate 26 to the bridge portion. A retainer is attached to the locking steps 20d and 20d provided opposite to the ceiling opening 20c of 20b. 27, and insert a hanger pin 28 into the center of the upper part of the back plate 26. The disk is suspended so as to be movable in the axial direction, and is inserted through the ceiling opening 20c. It is inserted and removed.

Since the caliper body 20 of this embodiment is a three-pot type with different diameters as described above, the pistons 22 to 24 can be integrated based on the inner and outer peripheral positions, center distances, and hole diameters of the cylinder holes 21a to 21c. The total thrust point O ₂ is determined instead of the thrust center point of the first embodiment. The disc radial direction line L ₃ in the direction of application of the opening force, which connects this total thrust point O ₂ and the center of the disc rotor 3 (not shown), is located slightly to the left of the center of the friction pad 25 in FIG. The end walls 20e, 20e of the bridge portion 21b are extended to the same position as the intersection line _L4 perpendicular to the disk radial direction line _L3 at the thrust total point _O2 , and the caliper body 20 is made into an asymmetrical shape. It is said that

[0020] In addition, in the above-mentioned embodiment, a hydraulic device that pushes the piston in the cylinder hole using hydraulic pressure is used. As explained with the disc brake, this invention uses a mechanical type or a combination of a hydraulic type and a mechanical type. It can also be applied to disc brakes.

[0021]

[Effect of the idea]

As described above, the caliper body of the present invention has is the thrust center point or total thrust point of the pad pushing member, and the distance between these and the disc rotor is The same as or beyond the intersection line perpendicular to the disk radial direction line connecting the center of Since the end wall of the bridge part and both acting parts connected to this end wall are extended to the opposite side, In the vicinity of the end wall of the disc, the influence of the opening force acting along the radial direction of the disc is extremely small. This makes it possible to increase the cross-sectional area of the bridge in this area, increasing rigidity. As a result, the amount of deformation of the action part can be kept small, thus improving the pedal feel. It is possible to improve performance.

[0022] Furthermore, the caliper body shape is almost the same as before, so molding can be done easily. Also, it does not interfere with installation on the vehicle body.

[Brief explanation of drawings]

[Fig. 1] Cross-sectional front view of a disc brake showing the first embodiment of the present invention

[Figure 2] II-II sectional view in Figure 1

[Fig. 3] Cross-sectional front view of a disc brake showing the second embodiment of the present invention

[Explanation of symbols]

1... Disc brake, 2, 20... Caliper body, 2
a, 20a...first action part, 2b...second action part, 2c, 2
0b...Bridge portion, 2d...Reaction force claw, 2e, 20c...Ceiling opening, 2f...Locking step, 2g, 20e...End wall, 3...Disc rotor, 6, 21a, 21b, 21c...Cylinder hole , 7, 25... Friction pad, 8... Piston, O ₁ ... Thrust center point of piston 8, L ₁ ... Disk radial direction line connecting thrust center point O ₁ and the center of disc rotor 3, L ₂ ... Disc. An intersecting line perpendicular to the radial direction line L ₁ , O ₂ ... Thrust total point of the pistons 22 to 24, L ₃ ... Disc radial direction line connecting the thrust total point O ₂ and the center of the disc rotor 3, L ₄
...A line of intersection perpendicular to the disk radial direction line _L3

Claims (2)

[Scope of utility model registration request] Claim 1: A first acting part and a second acting part facing each other with the disc rotor in between are connected by a bridge part spanning the outer periphery of the disc rotor, and one of the first and second acting parts is connected. Alternatively, in a caliper body of a vehicle disc brake in which a pad pushing member such as a piston is inserted into a cylinder hole bored in both sides, the end wall of the bridge portion in the disc circumferential direction is connected to the pad pushing member. It is characterized by extending to the same or the opposite side beyond the intersection line that is perpendicular to the disk radial direction line connecting the thrust center point and the center of the disk rotor at the thrust center point of the disc rotor. Caliper body for vehicle disc brakes. [Claim 2] A first acting part and a second acting part facing each other with the disc rotor in between are connected by a bridge part spanning the outer periphery of the disc rotor, and one of the first and second acting parts is connected. Alternatively, in a caliper body of a vehicle disc brake in which a plurality of cylinder holes are arranged in parallel in the circumferential direction of the disk and a pad pushing member such as a piston is inserted into these cylinder holes, the circumference of the disk of the bridge portion is The end wall of the direction is the same as the intersection line orthogonal to the disk radial direction line connecting the thrust total point and the center of the disc rotor at the thrust total point of the plurality of pad pushing members, or this intersection line A caliper body for vehicle disc brakes that extends to the opposite side.