JP2572188Y2 - Caliper body mounting structure for vehicle disc brakes - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caliper body of a disc brake used for various traveling vehicles such as automobiles and motorcycles, and more particularly, to a structure for mounting the caliper body to a vehicle body from a disc radial direction.

[0002]

2. Description of the Related Art A structure in which a caliper body of a vehicle disk brake is mounted on a vehicle body in a disk radial direction is generally called a radial mount. As a conventional example of this type, for example, Japanese Patent Application Laid-Open No. 63-135623, There is one disclosed in Japanese Patent Application Laid-Open No. Hei 1-210628.

[0003] These caliper bodies are of a piston opposing type having a cylinder hole in a cylinder cylinder at the center of an operation portion disposed opposite to both sides of a disk rotor, and have one operation portion (hereinafter, referred to as a body mounting side). A pair of bolt insertion holes are formed in the disk inlet and outlet sides of the cylinder cylinder in the radial direction of the disk, and the mounting bolts inserted into the bolt insertion holes are screwed into the mounting side working portion). And the caliper body is mounted on the body.

[0004]

When the braking action is performed by the above-mentioned caliper body, the braking reaction force generated by the sliding contact between the disk rotor and the friction pad acts on both action portions, and the action on the mount side. In the part, the tightening torque of the mounting bolt becomes a thrust in the mounting direction to the center cylinder cylinder, so that the behavior due to the braking reaction force is suppressed and almost no bending deformation occurs, whereas the other action not supported by the vehicle body The braking reaction force is concentrated in the portion (hereinafter, referred to as the anti-mounting side working portion), and the entire working portion on the anti-mounting side is largely bent away from the disk rotor with the bridge portion straddling the outside of the disk rotor as a fulcrum, At the same time, the frictional pad on the anti-mount side also has a smaller pressing force on the disk rotor than on the mount side.

[0005] For this reason, the friction pad causes a wear difference in that the lining wears fast on the mount side and slows on the non-mount side. Replacement must be performed in an early cycle to match the friction pads on the fast-wearing mount.

Further, in the working portion on the opposite side of the mount, the amount of rollback of the piston must be set to be extremely larger than that of the mount side, so that the angular seal for rolling back the piston in the cylinder hole is also greatly deformed. However, an excessive load is applied to the square seal, and the wear is accelerated.

[0007] Furthermore, there is a problem that an extra gap must be provided in a narrow space between the caliper body and the tire wheel so that the acting portion on the opposite side of the mount that bends and deforms does not interfere with the tire wheel. .

[0008] Further, since the vehicle body mounting portion of the mount side working portion in which the bolt insertion hole is formed is clamped to the vehicle body without loosening by the mounting bolt, the opposite mounting side working portion is moved in the disk ejecting direction by the braking torque. Dragged,
The caliper body behaves with the mounting bolt as a fulcrum, and a bending moment acts on the vehicle body mounting portion to generate concentrated stress therein, which may cause damage such as metal fatigue and cracks on the vehicle body mounting portion.

The present invention has been made in view of such circumstances, and a first object is to prevent bending deformation due to a braking reaction force.
By distributing it to the working part on the body mount side, both linings are worn as evenly as possible, extending the replacement cycle of the friction pad, increasing the durability of the square seal, and as a second purpose, the It is an object of the present invention to minimize stress concentration, prevent damage such as metal fatigue and cracks, and enhance the durability of a caliper body.

[0010]

According to the above-mentioned object, a first method is provided.
The idea is to dispose the working parts of the caliper body on both sides of the disc rotor, and to provide cylinder holes for accommodating pistons in the cylinder cylinders at the center of each working part by opening them to the disc rotor side. Bolt insertion holes are formed in the vehicle body mounting portions on the disk reciprocating side and the revolving side sandwiching the cylinder cylinder of the portion in the radial direction of the disk, respectively.
In a caliper body mounting structure for a disc brake for a vehicle, wherein a mounting bolt inserted into the bolt insertion hole is screwed to a vehicle body to mount the caliper body to the vehicle body, the bolt insertion hole has a center axis acting on the mount side. It is characterized in that it is provided so as to be deviated toward the disk rotor side from the cylinder opening surface of the portion.

In the second invention, a sleeve is interposed between the bolt insertion hole and the shaft portion of the mounting bolt, and the sleeve is projected from the caliper mounting portion seating surface of the vehicle body to the outside of the bolt insertion hole. And a nut screwed to the head of the mounting bolt or the external thread of the mounting bolt is supported on the outer end surface of the sleeve.

[0012]

According to the structure of the first invention, the center axis of the bolt insertion hole is located between the cylinder opening surfaces of both working portions, and the tightening torque of the mounting bolt is slightly increased from the cylinder cylinder of the mount side working portion. Acts on the disk rotor side. As a result, the cylinder cylinder of the mount-side operating portion is allowed to have a slight behavior due to the braking reaction force, and the anti-disc rotor-side bending deformation is suppressed to a small degree in the anti-mount-side operating portion.

Further, in the configuration of the second invention, only the tightening torque of the mounting bolt or the nut screwed to the mounting bolt acts on the sleeve, and the vehicle body mounting portion of the mount side working portion is not directly clamped by the mounting bolt or the nut. . For this reason, when the working part on the opposite side of the mount is dragged in the disk ejecting direction and a bending moment acts on the vehicle body mounting part, the vehicle body mounting part follows the behavior of the caliper body within its elastic deformation limit. As a result, the mounting bolt can be turned around the axis or flexurally deformed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

The caliper body 2 used in the disc brake 1 has action portions 2a and 2b opposed to both sides of a disc rotor 3 rotating in the direction of arrow A.
a, 2b center cylinder cylinders 2d, 2e are respectively provided with two large and small cylinder holes 4 facing each other, and in these cylinder holes 4, a four-pot piston facing type in which a large or small diameter piston 5 is accommodated. , The operating part 2a on the mount side,
It is mounted on the caliper mounting portions 6, 6 on the vehicle body side by two mounting bolts 20, 20.

The mount-side action portion 2a and the anti-mount-side action portion 2b are connected by a bridge portion 2c straddling the outer periphery of the disk rotor 3, and a rectangular ceiling opening is formed at the center of the bridge portion 2c. 7 are formed. The disk facing surface of the ceiling opening 7 is flush with the cylinder opening surfaces 2f, 2g of the working portions 2a, 2b, and the disk inlet and outlet sides of the ceiling opening 7 are the working portion 2a. , 2
and b is continuous with the torque receiving surfaces 2h and 2i.

A pair of friction pads 8, 8 are arranged between the cylinder opening surfaces 2f, 2g with the disk rotor 3 interposed therebetween. Each friction pad 8 has a lining 9 on one side.
The inner corners of the disc on the inner peripheral side of the back plate 10 to which are adhered are arranged from the torque receiving surfaces 2h and 2i of the action portions 2a and 2b to the disc entrance side and the exit side surface of the ceiling opening 7. L
The strength member 1 is supported by the retainers 11, 11, and the outer surface of the disk of the back plate 10 is erected in the ceiling opening 7.
2 and is supported so as to be movable in the axial direction of the disk, and is attached and detached through the ceiling opening 7 from which the strength member 12 is removed for maintenance or pad replacement.

Each of the pistons 5 has a distal end acting on the working portion 2a, 2b.
Are protruded from the cylinder opening surfaces 2f and 2g and are liquid-tightly and movably held by a square seal 13 fitted in the seal groove 4a of the cylinder hole 4. A hydraulic chamber 14 is defined between the bottom of each cylinder hole 4 and the piston 5, and these four hydraulic chambers 14
The two a and b adjacent to each other communicate with each other through the liquid through hole 15, and the two opposing ones on the disk outlet side communicate with each other through an external liquid through pipe 16 disposed over the outside of the disk rotor 3. I have.

The mounting portion 2a on the mount side is provided with a union hole 17 for introducing a pressurized hydraulic fluid and bolt insertion holes 18 for mounting the vehicle body, and a brew for discharging air mixed in the hydraulic fluid. A screw 19 is provided on both working parts 2a, 2b. The pressurized hydraulic fluid supplied to the union hole 17 is supplied to the hydraulic pressure chamber 14 on the disc outlet side of the mount-side operating portion 2a, and further passes through the liquid through-hole 15 and the liquid through-tube 16 to the other three fluids. The pressure is supplied to the pressure chamber 14.

The bolt insertion holes 18, 18 are respectively formed in the vehicle body mounting portions 2j, 2j on the disk reciprocating side and the revolving side with the cylinder cylinder 2d of the mount side operating portion 2a interposed therebetween in the radial direction of the disk. . The center axis O of the bolt insertion hole 18 is deviated by a distance L from the cylinder opening surface 2f of the mount-side operating portion 2a toward the disk rotor 3, and substantially the entire bolt insertion hole 18 comes off the cylinder cylinder 2d. Is located on the disk rotor 3 side.

Each of the caliper mounting portions 6 and 6 on the vehicle body side to which the caliper body 2 is mounted has mounting bolts 2 respectively.
0 is protruding. This mounting bolt 20 is
The base end of the caliper body 2 is a stud bolt screwed into the caliper mounting portion 6, and the caliper body 2 has a rigid sleeve 21 inserted into each bolt insertion hole 18, and the sleeve 21 further has a caliper mounting portion 6. Insert the shaft portion 20a of the mounting bolt 20 projecting from the
Is mounted on the caliper mounting portion 6, and a nut 22 is screwed onto the external thread portion 20 b at the tip of the shaft portion 20 a protruding from the sleeve 21, and mounted on the vehicle body.

The sleeve 21 is slightly longer than the bolt insertion hole 18 and shorter than the shaft portion 20a of the mounting bolt 20. An outer flange 21a is provided around the inner end surface. The sleeve 21 is interposed between the bolt insertion hole 18 and the shaft portion 20a of the mounting bolt 20 as described above, and the outer flange 21a is attached to the caliper mounting portion 6.
A nut 22 is supported on an outer end surface of a sleeve 21 which is sandwiched between the seat surface 6a of the sleeve 21 and the vehicle body mounting portion 2j and protrudes from the bolt insertion hole 18.

This embodiment is configured as described above.
Further, the tightening torque of the mounting bolt 20 and the nut 22 acts only on the sleeve 21 that supports the nut 22 on the outer end surface, and the body mounting portions 2j, 2j of the caliper body 2
Are not directly clamped.

The center axis O of each bolt insertion hole 18 for attaching the caliper body 2 to the vehicle body is displaced by a distance L from the cylinder opening surface 2f to the disk rotor 3 side, so that substantially the entire bolt insertion hole 18 is formed. Is located on the disk rotor 3 side from the cylinder cylinder 2d, the tightening torque of the mounting bolt 20 and the nut 22 provided in the bolt insertion hole 18 is reduced by the cylinder cylinder 2 of the mount-side operating portion 2a.
d and acts on the disk rotor 3 side. Thereby, the cylinder cylinder 2d on the mount side is allowed to have a slight behavior with the bridge portion 2c as a fulcrum.

Hereinafter, the operation of this embodiment will be described.

A piston 5 housed in each cylinder hole 4
Is pushed out in the direction of the opening of the cylinder hole 4 by the hydraulic fluid supplied from the union hole 17 to the hydraulic chamber 14 through the liquid communication hole 15 and the liquid communication pipe 16 while deforming the square seal 13, and the friction is generated. The pads 8 are pressed against the disk rotor 3, respectively, and the linings 9,
9 is brought into sliding contact to perform a braking action.

By the above-described braking action, the friction pads 8, 8
, A braking reaction in the direction opposite to the disk acts from the disk rotor 3, and this braking reaction is applied to each piston 5.
The hydraulic fluid in the hydraulic chamber 14 is transmitted to both the working portions 2a and 2b of the caliper body 2.

Actuator 2a on the mount side that has received the braking reaction force
Then, the center cylinder cylinder 2d is slightly deformed in the direction opposite to the disk with the bridge portion 2c as a fulcrum. On the other hand, in the working portion 2b on the opposite side to the mount, the whole is deformed in the direction opposite to the disk with the bridge portion 2c as a fulcrum. In this embodiment, the cylinder cylinder 2d on the mount side is deformed as described above, and Since the amount of deformation due to the force is dispersed to the acting portion 2a on the mount side, the amount of bending of the acting portion 2b on the opposite side of the mount and the amount of rollback of the piston 5 of the acting portion 2b can be suppressed to be smaller than in the related art. Further, the decrease in the pressing force of the friction pad 8 on the side opposite to the mount against the disk rotor 3 is also small.

Thus, both linings 10, 10
The frictional difference between the two friction pads 8, 8 can be suppressed as much as possible, and the friction pads 8, 8 can be effectively used up to near the wear limit of the lining 10, so that the economy is excellent. Since the cycle can be extended, maintenance can be reduced.

Further, since the amount of bending deformation of the non-mount-side operating portion 2b can be suppressed smaller than before, the gap between the operating portion 2b and a tire wheel (not shown) is reduced, and the area around the disk brake is made compact. Or increasing the shortened length of the gap in the action portion 2b, increasing the rigidity of the action portion 2b, and further suppressing the amount of bending deformation.
A measure can be selected, and the degree of freedom of design can be improved.

Further, since the rollback amount of the piston 5 on the non-mounting side is suppressed to be smaller than in the conventional case, an excessive load or deformation exceeding the elastic limit is not applied to the corner seal 13 on the non-mounting side. The durability of the corner seal 13 can be improved.

Further, a nut 22 screwed to the mounting bolt 20 is supported on the outer end surface of the sleeve 21, and the tightening torque is not directly applied to the vehicle body mounting portions 2 j, 2 j of the caliper body 2. When the mounting portion 2b on the mount side is slid in the disc unwinding direction by the braking torque and a bending moment acts on the vehicle body mounting portions 2j, the vehicle body mounting portions 2j, 2j are mounted on the mounting bolts within the elastic deformation limit. 20 and follow the behavior of the caliper body 2. Accordingly, the stress generated in the vehicle body mounting portions 2j, 2j is suppressed to be small, and damage such as metal fatigue and cracks of the vehicle body mounting portions 2j, 2j is prevented, so that the durability of the caliper body 2 can be enhanced.

In the above-described embodiment, the mounting bolt is described as a stud bolt. However, in the present invention, a casting bolt having a bolt head cast into a caliper mounting portion, or a male screw at a tip of a shaft portion is mounted with a caliper. It may be a screw bolt that is screwed into the female screw hole of the section. In the case of this screw-in bolt, the head of the bolt is supported on the outer end surface of the sleeve instead of the nut of the embodiment. In the above embodiment, the flange integrally formed on the sleeve may be omitted.

[0034]

[Effects of the Invention] In the present invention, a central cylinder is sandwiched between one working portion disposed on one side of a disk rotor.
By disposing the center axis of the bolt insertion hole formed through the disk radial direction on the disk inlet side and the disk outlet side from the cylinder opening surface of one of the action portions toward the disk rotor, both friction pads of Since the difference in lining wear can be kept as small as possible, the friction pad can be used effectively close to the lining wear limit, making it economical. This is suitable for a race vehicle in which the reduction of the pit in time is a proposition.

Further, since the amount of bending deformation of the working portion on the opposite side of the mount can be suppressed smaller than before, the area around the disk brake can be made compact, and the amount of bending deformation on the side of the opposite side of the mounting can be further reduced. Measures such as suppression can be achieved, and the degree of freedom in design can be improved. Furthermore,
Since the rollback amount of the piston on the non-mounting side is suppressed to be smaller than before, the durability of the square seal for rolling back the piston can be increased.

Further, a sleeve is interposed between the above-mentioned bolt insertion hole and the shaft portion of the mounting bolt, and the sleeve is formed to have a length protruding from the caliper mounting portion seating surface of the vehicle body to the outside of the bolt insertion hole. At the same time, the outer end surface of the sleeve is supported by a nut screwed to the head of the mounting bolt or the external thread of the mounting bolt, so that the vehicle body mounting portion can follow the behavior of the caliper body. In addition, since the stress generated in the vehicle body mounting portion can be suppressed to be small, and damage such as metal fatigue and cracks does not easily occur in the vehicle body mounting portion, the durability of the caliper body can be increased.

[Brief description of the drawings]

FIG. 1 is a partial sectional plan view of a caliper body showing one embodiment of the present invention.

FIG. 2 is a partial sectional front view of the caliper body showing one embodiment of the present invention.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disc brake 2 ... Caliper body 2a ... Working part on the vehicle body mounting side 2b ... Working part on the non-mounting side 2c ... Bridge part connecting both working parts 2a and 2b 2d ... Cylinder cylinder of mounting side working part 2a 2e ... Anti-mounting Cylinder cylinder 2f of side working portion 2b ... Cylinder opening surface of mounting side working portion 2a 2g ... Cylinder opening surface of anti-mounting side working portion 2b 2h, 2i ... Torque receiving surface 2j ... Vehicle body mounting portion of caliper body 2 3 ... Disk rotor DESCRIPTION OF SYMBOLS 4 ... Cylinder hole 4a ... Seal groove of square seal 13 5 ... Piston 6 ... Caliper mounting part on body side 6a ... Caliper mounting part seat 7 ... Ceiling opening 8 ... Friction pad 9 ... Lining of friction pad 8 10 ... Friction Back plate 13 of pad 8 ... Square seal fitted in seal groove 4a 14 ... Hydraulic chamber 18 ... Formed on mount side working portion 2a Bolt insertion hole 20 ... Mounting bolt 20a ... Shaft portion of mounting bolt 20 20b ... Male thread at tip of shaft portion 20a 21 ... Sleeve A ... Rotating direction of disk rotor 3 O ... Center axis of bolt insertion hole 18 L ... Bolt insertion Distance between the central axis O of the hole 18 and the cylinder opening surface 2f of the mount-side operating portion 2a

Claims (2)

(57) [Scope of request for utility model registration] An operating portion of a caliper body is disposed on both sides of a disk rotor so as to face each other, and a cylinder bore for accommodating a piston is provided in a cylinder cylinder at the center of each operating portion so as to open to the disk rotor side. Bolt insertion holes are respectively formed in the vehicle mounting portions on the disk reciprocating side and the rewinding side with the cylinder cylinder interposed therebetween in the radial direction of the disk, and mounting bolts inserted into the bolt insertion holes are screwed to the vehicle body. In the caliper body mounting structure of a vehicle disc brake for mounting the caliper body on a vehicle body, the bolt insertion hole may be configured such that a center axis of the bolt insertion hole is deviated toward a disk rotor side from a cylinder opening surface of the one acting portion. A caliper body mounting structure for a vehicle disc brake, wherein the caliper body mounting structure is provided. 2. A sleeve is interposed between the bolt insertion hole and a shaft portion of the mounting bolt, and the sleeve is formed to have a length protruding from the seat surface of the caliper mounting portion of the vehicle body to the outside of the bolt insertion hole. 2. A caliper body mounting structure for a disc brake for a vehicle according to claim 1, wherein a nut screwed to a head of said mounting bolt or an external thread of said mounting bolt is supported on an outer end surface of said sleeve. .