JPH0712638U - Vehicle disc brake caliper body mounting structure - Google Patents

Abstract

(57) [Abstract] [Purpose] The flexural deformation due to the braking reaction force is distributed to both action parts of the caliper body that is radially mounted on the vehicle body, and the friction difference between the linings of both friction pads is minimized to make the friction pads effective. Use it to reduce the number of friction pad changes. Increase the durability of the corner seal. Improves freedom of design around disc brakes. [Structure] Bolt insertion holes 18, 18 for mounting on a vehicle body are formed through the mounting side action part 2a in the radial direction of the disc with a central cylinder tube 2d interposed therebetween. , The respective central axes O are provided at positions separated by a distance L from the cylinder opening surface 2f toward the disk rotor 3 side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a caliper body of a disc brake used in various traveling vehicles such as automobiles and motorcycles, and more particularly to a structure for mounting the caliper body to a vehicle body in the disc radial direction.

[0002]

[Prior art]

 A structure in which a caliper body of a vehicle disc brake is attached to a vehicle body from a disc radial direction is generally called a radial mount. As a conventional example of this type, for example, Japanese Patent Laid-Open No. 63-135623 and Japanese Laid-Open Patent Publication No. 1-135623. There is one disclosed in Japanese Patent No. 210628.

These caliper bodies are piston facing types in which a cylinder hole in the center of a working portion is arranged opposite to both sides of a disk rotor, and a cylinder hole is provided in the center of the working portion. , Mount side action part), a pair of bolt insertion holes are formed in the disk radial direction in the disk entry side and the entry side with the cylinder tube sandwiched between them, and the mounting bolts inserted into the bolt insertion holes are screwed. Stop and then mount the caliper body on the car body.

[0004]

[Problems to be solved by the device]

 When the above-mentioned caliper body performs braking action, the braking reaction force generated by the sliding contact between the disc rotor and the friction pad acts on both action parts, and at the mount-side action part, the tightening torque of the mounting bolt However, since it acts as a thrust in the mounting direction on the center cylinder cylinder, the behavior due to the braking reaction force is suppressed, and bending deformation hardly occurs, while the other action part not supported by the vehicle body (hereinafter, the action on the anti-mount side). Part), the reaction force is concentrated, and the entire action part on the anti-mount side flexes largely away from the disc rotor with the bridge part that straddles the outside of the disc rotor as the fulcrum, and at the same time, the friction pad on the anti-mount side. However, the pressing force on the disc rotor is smaller than that on the mount side.

Therefore, in the friction pad, there is a difference in wear that the wear of the lining is fast on the mount side and slow on the anti-mount side, and the anti-mount side lining does not reach the wear limit, but the friction pad is The replacement and maintenance must be performed in a fast cycle in accordance with the friction pad on the mounting side, which has fast wear.

Further, in the action portion on the side opposite to the mount, the amount of rollback of the piston needs to be set to be extremely larger than that on the side of the mount, so that the angle seal for rolling back the piston inside the cylinder hole is also greatly deformed. However, an excessive load is applied to the corner seal, which accelerates wear.

[0007] Furthermore, in the narrow space between the caliper body and the tire wheel, it is necessary to allow an extra gap so that the acting portion on the side opposite to the mount that is flexibly deformed does not interfere with the tire wheel. There is.

Further, since the vehicle body attachment portion of the mount side action portion where the bolt insertion hole is formed is clamped to the vehicle body without loosening by the attachment bolt, the action portion on the side opposite to the mount side is moved toward the disc by the braking torque. When the caliper body is dragged, the caliper body behaves around the mounting bolt as a fulcrum, and a bending moment acts on the vehicle body mounting portion to generate concentrated stress inside, which may lead to metal fatigue, cracks, or other damage to the vehicle body mounting portion. .

The present invention has been made in view of such an actual situation, and a first object thereof is to distribute flexural deformation due to a braking reaction force to an action portion on the vehicle body mount side so that both linings are as uniform as possible. Abrasion to prolong the friction pad replacement cycle, improve the durability of the corner seal, and secondly, to avoid concentration of stress on the vehicle body mounting part as much as possible to prevent metal fatigue and damage such as cracks. It is to prevent and increase the durability of the caliper body.

[0010]

[Means for Solving the Problems]

 In accordance with the above-mentioned object, in the first invention, the working portions of the caliper body are arranged opposite to each other on both sides of the disc rotor, and the cylinder cylinder at the center of each working portion is provided with a cylinder hole for accommodating the piston toward the disc rotor side. The bolt insertion holes are formed through the disk mounting side and the delivery side of the body mounting side of the body mounting side, which sandwich the cylinder cylinder, in the disk radial direction. In a vehicle disc brake caliper body mounting structure in which the mounting bolt to be inserted is screwed to the vehicle body and the caliper body is mounted to the vehicle body, in the bolt insertion hole, the central axis of the bolt insertion hole is the cylinder of the mount side action portion. It is characterized in that it is provided so as to be displaced toward the disk rotor side with respect to the opening surface.

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 extended from the seat surface of the caliper mounting portion of the vehicle body to the outside of the bolt insertion hole. The sleeve is formed so as to have a protruding length, and a nut that is screwed to the head of the mounting bolt or the male screw of the mounting bolt is supported on the outer end surface of the sleeve.

[0012]

[Action]

 According to the structure of the first invention, the central 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 different from that of the cylinder cylinder of the mounting side working portion. Act on the side. As a result, the cylinder cylinder of the mount side action portion is allowed to slightly move due to the braking reaction force, and the work portion on the side of the non-mount side is suppressed from being flexibly deformed toward the side opposite to the disc rotor.

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 mounted by the mounting bolt or the nut. Not directly clamped. Therefore, when the action part on the opposite mount side is dragged in the disc slewing 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. By doing so, the mounting bolt can be rotated around its axis or flexibly deformed.

[0014]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

The caliper body 2 used for the disc brake 1 has acting portions 2a and 2b arranged opposite to each other on both sides of a disc rotor 3 rotating in the direction of arrow A, and a cylinder cylinder 2d at the center of the acting portions 2a and 2b. 2e are provided with two large and small cylinder holes 4 facing each other, and a 4-port piston facing type in which a large or small diameter piston 5 is housed in these cylinder holes 4, and a working portion 2a on the mount side. Is attached to the caliper attaching portions 6 and 6 on the vehicle body side with two attaching bolts 20 and 20.

The acting portion 2a on the mount side and the acting portion 2b on the non-mount side are connected by a bridge portion 2c straddling the outer periphery of the disk rotor 3, and a rectangular ceiling opening portion is formed in the central portion 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 entrance side and the exit side surface of the ceiling opening 7 are It is continuous with the torque receiving surfaces 2h and 2i of the portions 2a and 2b.

A pair of friction pads 8, 8 are arranged between the cylinder opening surfaces 2 f, 2 g with the disc rotor 3 interposed therebetween. Each of the friction pads 8 is provided with a lining 9 on one side thereof, and the two corners of the inner side of the disk of the back plate 10 are inserted from the torque receiving surfaces 2h and 2i of the operating sections 2a and 2b into the disk of the ceiling opening 7. Supported by L-shaped retainers 11 and 11 arranged on the side and the feeding side surface, and the disc outer surface of the back plate 10 is prevented from coming off by a strength member 12 installed on the ceiling opening 7. It is supported so as to be movable in the disc axial direction, and is attached and detached through the ceiling opening 7 from which the strength member 12 is removed at the time of maintenance or pad replacement.

Each piston 5 has its tip protruding from the cylinder opening surface 2f, 2g of the action portion 2a, 2b, and is liquid-tight and movable by the corner seal 13 fitted in the seal groove 4a of the cylinder hole 4. Held in. A hydraulic chamber 14 is defined between the bottom of each cylinder hole 4 and the piston 5, and these four hydraulic chambers 14 are formed by two adjacent action chambers 2a and 2b. The two fluid communication holes 15 communicate with each other, and the two opposing ones on the disc spill-out side are communicated with each other by an external fluid communication pipe 16 arranged across the outside of the disc rotor 3.

The action portion 2a on the mount side is provided with a union hole 17 for introducing the pressurized hydraulic fluid and bolt insertion holes 18, 18 for mounting the vehicle body, and a brew for exhausting mixed air in the hydraulic fluid. Dusk 19 is provided in both action parts 2a and 2b. The pressure-increased hydraulic fluid supplied to the union hole 17 is supplied to the hydraulic chamber 14 on the disk feeding side of the mount side action portion 2a, and further through the liquid passage hole 15 and the liquid passage pipe 16 to the other three. It is supplied to the hydraulic chamber 14.

The bolt insertion holes 18 and 18 are formed to penetrate through the body mounting portions 2j and 2j on the disc entry side and the delivery side, respectively, which sandwich the cylinder tube 2d of the mount side action portion 2a, in the disc radial direction. There is. The central axis O of the bolt insertion hole 18 is displaced from the cylinder opening surface 2f of the mount side action portion 2a toward the disc rotor 3 by a distance L, and substantially the entire bolt insertion hole 18 is formed in the cylinder tube 2d. It is located outside the disk rotor 3 side.

Mounting bolts 20 are respectively provided in a protruding manner on the caliper mounting portions 6 and 6 on the vehicle body side to which the caliper body 2 is mounted. The mounting bolt 20 is a stud bolt in which the base end of the shaft portion 20a is 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 further The shaft portion 20a of the mounting bolt 20 protruding from the caliper mounting portion 6 is inserted into the sleeve 21, the vehicle body mounting portion 2j is overlapped with the caliper mounting portion 6, and the male screw portion 20b of the shaft portion 20a tip protruding from the sleeve 21 is inserted. The nut 22 is screwed on and mounted on the vehicle body.

The sleeve 21 has a length slightly longer than the bolt insertion hole 18 and shorter than the shaft portion 20a of the mounting bolt 20, and 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 serves to connect the seat surface 6a of the caliper mounting portion 6 and the vehicle body mounting portion 2j. The nut 22 is supported on the outer end surface of the sleeve 21 which is sandwiched between and projects from the bolt insertion hole 18.

The present embodiment is configured as described above, and the tightening torque between the mounting bolt 20 and the nut 22 acts only on the sleeve 21 that supports the nut 22 at the outer end surface, and The vehicle body mounting portions 2j, 2j are not directly clamped.

Further, the central axis O 1 of each bolt insertion hole 18 for mounting the caliper body 2 on the vehicle body side is displaced from the cylinder opening surface 2f toward the disk rotor 3 side by a distance L, so that substantially the entire bolt insertion hole 18 is formed. Is located on the side of the disk rotor 3 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 released from the cylinder cylinder 2d of the mount side action portion 2a. Acts closer to data 3. As a result, the cylinder cylinder 2d on the mount side is allowed to move slightly with the bridge portion 2c as a fulcrum.

The operation of this embodiment will be described below.

The piston 5 housed in each cylinder hole 4 is a cylinder that deforms the corner seal 13 by the working fluid supplied from the union hole 17 to the hydraulic chamber 14 through the liquid passage hole 15 and the liquid passage pipe 16. It is pushed toward the opening of the hole 4 to press the friction pads 8 and 8 against the disk rotor 3, respectively, and the linings 9 and 9 are slidably contacted with both side surfaces of the rotor 3 to perform a braking action.

Due to the above-described braking action, a braking reaction force in the anti-disc direction from the disk rotor 3 acts on the friction pads 8, 8, and this braking reaction force acts on the respective piston 5 and hydraulic chamber 14. It is transmitted to both acting portions 2a and 2b of the caliper body 2 via the hydraulic fluid.

In the action portion 2a on the mount side that receives the braking reaction force, the central cylinder tube 2d is slightly deformed in the direction opposite to the disc with the bridge portion 2c as a fulcrum. On the other hand, in the non-mount side action portion 2b, the whole is deformed in the anti-disc direction with the bridge portion 2c as a fulcrum. Since the amount of deformation due to the force is distributed to the working portion 2a on the mount side, the amount of bending of the non-mounting side working portion 2b and the amount of rollback of the piston 5 of the reaction portion 2b are smaller than in the conventional case. Further, the pressing force of the friction pad 8 on the side opposite to the mount with respect to the disc rotor 3 is reduced, and the reduction is small.

As a result, the difference in wear between the two linings 10 and 10 can be suppressed as much as possible, and both friction pads 8 and 8 can be used effectively up to the wear limit of the lining 10, which is economical. Also, the replacement cycle of both friction pads 8, 8 can be extended, and maintenance work can be reduced.

Further, since the amount of flexural deformation of the non-mount side action portion 2b can be suppressed to be smaller than that in the conventional case, the gap between the action portion 2b and the tire wheel (not shown) can be reduced, and the area around the disc brake can be made compact. It is possible to select measures such as increasing the rigidity of the acting portion 2b and suppressing the amount of bending deformation by increasing the length of the shortening of the gap to the acting portion 2b to increase the rigidity of the acting portion 2b. The degree can be improved.

Further, since the rollback amount of the piston 5 on the anti-mount side can be suppressed to a smaller value than in the conventional case, the angular seal 13 on the anti-mount side will not be subjected to excessive load or deformation exceeding the elastic limit. The durability of the corner seal 13 can be improved.

Further, the 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 2j, 2j of the caliper body 2. When the acting portion 2b on the side opposite to the mount is dragged in the disc unwinding direction by the braking torque, and a bending moment is applied to the vehicle body mounting portions 2j, 2j, the vehicle body mounting portions 2j, 2j fall within the elastic deformation limit. In the above, the behavior of the caliper body 2 is followed by rotating around the axis of the mounting bolt 20 or bending and deforming. As a result, the stress generated in the vehicle body mounting portions 2j, 2j is suppressed to be small, and metal fatigue, cracks, and other damage to the vehicle body mounting portions 2j, 2j are prevented, so the durability of the caliper body 2 can be increased. .

In the above embodiments, the mounting bolts are described as stud bolts. However, the present invention uses a caster bolt in which the bolt head is cast into the caliper mounting portion, and a shank at the tip of the shaft portion. A screw-in bolt that is screwed into the female screw hole of the mounting portion may be used. 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. Further, in the above embodiment, the flange integrally formed with the sleeve may be omitted.

[0034]

[Effect of device]

 According to the present invention, a bolt insertion hole is formed on one side of a disk rotor, with a cylinder cylinder in the center, and is formed through the disk in and out sides in the disk radial direction. By arranging the center axis of the hole closer to the disc rotor from the cylinder opening surface of one of the action parts, the difference in wear between the linings of both friction pads can be suppressed as much as possible compared to the conventional one, so the friction pads are lined. It is economical because it can be used effectively up to its wear limit, and the friction pad replacement cycle can be extended, which reduces the burden of maintenance and maintenance, and is particularly suitable for race vehicles where shortening the pit-in time is an issue. Is.

Further, since the amount of flexural deformation of the non-mounting side action portion can be suppressed to be smaller than that in the conventional case, the size around the disc brake can be made compact, or the non-mounting side action portion can be padded to further reduce the amount of flexural deformation. Measures such as suppression can be taken, and the degree of freedom in design can be improved. Further, since the rollback amount of the anti-mount side piston can be suppressed to be smaller than the conventional one, it is possible to enhance the durability of the corner seal that rolls back the piston.

Further, a sleeve is interposed between the bolt insertion hole and the 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. At the same time, by mounting a nut that is screwed to the head of the mounting bolt or the male screw of the mounting bolt on the outer end surface of the sleeve, the body mounting portion can follow the behavior of the caliper body. Therefore, the stress generated in the vehicle body mounting portion can be suppressed to be small, and damage such as metal fatigue and cracks is less likely to occur in the vehicle body mounting portion, so the durability of the caliper body can be improved.

[Brief description of drawings]

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

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

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

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

[Explanation of symbols]

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

Claims (2)

[Scope of utility model registration request] 1. A working portion of a caliper body is disposed opposite to each other on both sides of a disk rotor, and a cylinder hole for accommodating a piston is provided in a cylinder cylinder at the center of each working portion so as to open toward the disk rotor side. Bolt insertion holes are formed in the vehicle body mounting portions on the disk entry side and the delivery side that sandwich the cylinder tube in the radial direction of the disk, and the mounting bolts inserted into the bolt insertion holes are screwed to the vehicle body. In the caliper body mounting structure for a vehicle disc brake in which the caliper body is mounted on the vehicle body, the central axis of the bolt insertion hole is displaced toward the disc rotor side from the cylinder opening surface of the one acting portion. A structure for mounting a caliper body of a vehicle disc brake, which is provided. 2. A sleeve is provided between the bolt insertion hole and the shaft portion of the mounting bolt, and the sleeve is formed to have a length that projects from the seat surface of the caliper mounting portion of the vehicle body to the outside of the bolt insertion hole. At the same time, a nut to be screwed to the head of the mounting bolt or the male screw of the mounting bolt is supported on the outer end surface of the sleeve, and a caliper body mounting structure for a vehicle disc brake according to claim 1, .