JP4028405B2 - Pin slide type caliper body for disc brakes for vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a caliper body of a multi-pot type disc brake used for various traveling vehicles such as automobiles, and is a pin slide supported by a caliper bracket on the vehicle body side so as to be slidable in a disc axial direction via a slide pin. Concerning the caliper body of the mold.
[0002]
[Prior art]
The action part and the reaction part arranged opposite to both sides of the disk rotor are connected by a bridge part that straddles the outer periphery of the disk rotor, and attached to the pin support arm provided on the disk entry side and the delivery side of the action part. The pin slide type caliper body, which is supported by the slide pin through the pin insertion hole of the caliper bracket fixed to the vehicle body on the working side of the disc rotor and slidable in the disc axial direction, has an increased vehicle size. In order to cope with the increase in size of the disk rotor accompanying the above, there is a so-called multi-pot type caliper body in which a plurality of cylinder holes are arranged in the working portion in the circumferential direction of the disk rotor (see, for example, Patent Document 1). .
[0003]
[Patent Document 1]
JP 2000-145835 A (second page, FIGS. 6 to 7)
[0004]
[Problems to be solved by the invention]
By the way, in the disc brake, the reaction force caused by the sliding contact between the disc rotor and the friction pad at the time of braking pushes back the action portion and reaction portion of the caliper body in the anti-disc direction, and the action portion and reaction portion disk with the bridge portion as a fulcrum. A force acts to open the rotor inner periphery and cause the C-shaped deformation. For this reason, it is conceivable that the entire outer surface of the body from the action part to the reaction part across the bridge part is formed thick in order to secure rigidity for preventing the deformation of the caliper body. However, when trying to increase the rigidity by this method, not only does the weight of the caliper body increase, but also there are problems such as variations in the cast material at the time of casting the caliper body, making it difficult to manufacture. It was.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a pin slide type caliper body for a vehicle disc brake that achieves a reduction in weight while ensuring rigidity against a C-shaped deformation of the caliper body.
[0006]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention connects an action part and a reaction part arranged opposite to both sides of a disk rotor by a bridge part that straddles the outer periphery of the disk rotor, and a plurality of cylinder holes are formed in the action part. A caliper that is arranged side by side in the circumferential direction of the disk rotor and that is fixed to the vehicle body on the disk rotor action part side by attaching slide pins attached to pin support arms provided on the disk entry side and the delivery side of the action part. In a pin slide type caliper body of a vehicle disc brake that is inserted into a pin insertion hole of a bracket and supported so as to be slidable in the disc axial direction, the side ribs on the disc insertion side and the extraction side of the caliper body, and the cylinder holes A center rib is provided on the outer surface of the caliper body so as to protrude in parallel with each other in the disk axial direction. The bridge portion extends linearly from the use portion in the disk axial direction, extends in a direction away from each other by the action portion, and continues to the pin support arms, respectively, and the side ribs are recessed in the disk axial direction. The center rib extends linearly in the disk axial direction from the reaction part to the action part through the bridge part, and extends in the disk axial direction from the bridge part to the upper part of the reaction part. A punched portion is continuously formed in the shape of a concave groove, a thinned portion is formed in the action portion, and a rib in the disk rotating direction is formed between both the hollowed portions of the center rib, and the center rib and the disk are rotated. by the direction of the ribs, has a substantially H-shaped as viewed from the bridge portion direction as a whole, between the side ribs and the center rib of the bridge portion, the bridge portion It is characterized in that an opening was formed visible friction pads arranged on the side.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the present invention is applied to a two-pot caliper body will be described in more detail with reference to the drawings. The caliper body 2 of the disc brake 1 connects the action portion 2a and the reaction portion 2b, which are arranged opposite to both sides of the disc rotor 3 rotating in the direction of arrow A, with a bridge portion 2c straddling the outer periphery of the disc rotor 3, Pin support arms 2d and 2d are provided on the disk entrance side and the exit side of the portion 2a, and slide pins 4 and 4 are attached to the pin support arms 2d and 2d with bolts 5 via the slide pins 4 and 4, respectively. The disk rotor 3 is supported by a caliper bracket 6 fixed to the vehicle body so as to be slidable in the disk axial direction.
[0008]
Two cylinder holes 7 are formed in the action portion 2a, and a cup-shaped piston 8 is inserted into each cylinder hole 7 through a square seal 9 so as to be fluid-tight and movable. A hydraulic chamber 10 is defined between the bottoms of the pistons 8, and a boss portion where a union hole 11 communicating with the hydraulic chambers 10, 10 opens on the outer side of the bottom wall between the cylinder holes 7, 7. 12 is provided, hydraulic fluid is pressurized by the hydraulic pressure master cylinder which otherwise shown through the union hole 11 is supplied to both the hydraulic chamber 10, 10. On the outside of the side wall of one cylinder hole 7, a bleeder boss portion 13 is formed for excluding mixed air in the working fluid to the outside, and a brewer screw 14 is screwed to the bleeder boss portion 12.
[0009]
The reaction portion 2b has three reaction force claws 2e, 2f, 2g protruding in parallel with the same length toward the inner side in the radial direction of the disk, and the reaction force claws 2e, 2 g is provided on the disk insertion side and the extraction side of the cylinder holes 7, 7, and the reaction force claw 2 f in the center is provided at a position corresponding to the space between the cylinder holes 7, 7. A pair of friction pads 15, 15 are disposed opposite to each other with the disc rotor 3 interposed inside the bridge portion 2 c between the reaction portion 2 b and the piston 8.
[0010]
The caliper bracket 6 includes a substantially U-shaped main body portion 6a fixed to the vehicle body on the working portion side of the disk rotor 3, and a disc insertion side on the side of the bridge portion 2c from the arm end of the main body portion 6a. The caliper support arm 6b has a pair of caliper support arms 6b and 6b straddling the outer periphery of the disc rotor 3 on the outlet side, and a tie bar 6c that connects the tips of the caliper support arms 6b and 6b on the reaction portion 2b side. , 6b are respectively provided with bottomed pin insertion holes 6d that open to the working portion side and are provided in the disk axial direction, and the slide pins 4, 4 are inserted through the pin insertion holes 6d, 6d.
[0011]
Each friction pad 15 includes a lining 16 that is in sliding contact with the side surface of the disk rotor 3, and a back plate 17 that holds the lining 16. Ear pieces 17 a and 17 a protrude from both sides of the back plate 17. . Each friction pad 15 holds the ear pieces 17a, 17a in the torque receiving recesses 6e, 6e of the caliper support arms 6b, 6b via the retainer / pad spring 18 on the action part side or the reaction part side of the disc rotor 3, respectively. ing.
[0012]
The caliper body 2 has side ribs 19 extending from the action portion 2a to the reaction portion 2b across the bridge portion 2c on the disk insertion side and the extraction side of the caliper body 2 and the outer surface portions between the cylinder holes 7 and 7. , 20 and a center rib 21 are provided so as to protrude parallel to each other in the disk axial direction. That is, the side ribs 19 and 20 linearly extend from the base position of the reaction force claws 2e and 2g in the direction of the disc axis in the bridge portion 2c, and extend in a direction away from each other at the action portion 2a to extend the pin support arms 2d and 2d. Each is continuous. The center rib 21 linearly extends in the disk axial direction from the base position of the central reaction force claw 2f to the action portion 2a via the bridge portion 2c.
[0013]
The side ribs 19 and 20 are respectively formed with concave portions 19a and 20a in the disk axial direction from the bridge portion 2c to the reaction portion 2b and above the reaction force claws 2e and 2g. The center rib 21 has a hollow portion 21a continuously formed in a concave groove shape from the bridge portion 2c to the upper portion of the reaction force claw 2f of the reaction portion 2b, and the thin portion 21b is formed in the portion of the action portion 2a. A rib 21c in the disk rotation direction is formed between both the lightening portions 21a and 21b, and has a substantially H shape in plan view as a whole as shown in FIG.
[0014]
Between the side rib 19 and the center rib 21 and between the center rib 21 and the side rib 20, concave grooves 22 and 23 in the disk axial direction are formed. In the bridge portion 2c, openings 24 and 24 through which the friction pads 15 and 15 arranged on both sides of the bridge portion 2c can be visually recognized are formed between the ribs 19, 21, 21, and 20, respectively. The wear of the lining 16 of the friction pad 15 can be visually confirmed through these openings 24 and 24 formed in a part of.
[0015]
In the disc brake 1 configured as described above, the hydraulic fluid boosted by the hydraulic master cylinder by the braking action is supplied to both hydraulic chambers 10, and each piston 8 advances in the cylinder hole 7 toward the disc rotor. Then, the friction pad 14 on the working part side is pressed against one side surface of the disk rotor 3, and the caliper body 2 is guided by the slide pins 4 and 4 by the reaction of the pressing and moves toward the working part, and the reaction force claw 2e, 2f and 2g press the friction pad 14 on the reaction part side against the other side of the disk rotor 3 to perform a braking action.
[0016]
During this braking action, the braking reaction force due to the sliding contact between the disk rotor 3 and the friction pads 15 and 15 is caused by the action part 2a and the reaction part 2b of the caliper body 2 via the piston 8 and the reaction force claws 2e, 2f and 2g. The action part 2a and the reaction part 2b are pushed back in the anti-disk direction, and the action part 2a and the reaction part 2b are deformed in a U shape with the bridge part 2c as a fulcrum. Since the side ribs 19 and 20 and the center rib 21 are provided corresponding to the positions of the reaction force claws 2e, 2f, and 2g, the caliper body 2 is less likely to be deformed in a letter C shape.
[0017]
And since the ribs 19, 20, and 21 are formed by raising a part of the outer surface part extending from the action part 2a to the reaction part 2b across the bridge part 2c, the rigidity of the caliper body 2 against the C-shaped deformation is secured. However, the caliper body 2 can be reduced in weight by reducing the thickness between the ribs. Moreover, further weight reduction can be achieved by forming the opening part 24 and the lightening part 19a, 20a, 21a, 21b. Furthermore, the rigidity of the pin support arms 2d and 2d can be improved by connecting the side ribs 19 and 20 to the pin support arms 2d and 2d, respectively.
[0018]
In the embodiment described above, the present invention is applied to a two-pot caliper body. However, the present invention can be applied to a caliper body having three or more pots.
[0019]
【The invention's effect】
As described above, the present invention can reduce the weight of the caliper body while ensuring the rigidity of the caliper body against the C-shaped deformation caused by the reaction force during braking action. In addition, by providing an opening through which the friction pad can be visually recognized between the ribs, it is possible to check the wear amount of the friction pad, and in addition to the lightening part provided in each rib, the weight can be further reduced. I can plan.
[Brief description of the drawings]
FIG. 1 is a plan view of a disc brake showing an embodiment of the present invention. FIG. 2 is a front view of the disc brake. FIG. 3 is a rear view of the disc brake. FIG. 5 is a cross-sectional view taken along the line VV in FIG.
DESCRIPTION OF SYMBOLS 1 ... Disc brake, 2 ... Caliper body, 2a ... Action part, 2b ... Reaction part, 2c ... Bridge part, 2d ... Pin support arm, 3 ... Disc rotor, 4 ... Slide pin, 6 ... Caliper bracket, 7 ... Cylinder hole , 8 ... piston, 19, 20 ... side rib, 19a, 20a ... thinned portion, 21 ... center rib, 21a, 21b ... thinned portion, 24 ... opening

Claims (1)

The action part and the reaction part arranged opposite to both sides of the disk rotor are connected by a bridge part that straddles the outer periphery of the disk rotor, and a plurality of cylinder holes are juxtaposed in the circumferential direction of the disk rotor in the action part. The slide pin attached to the pin support arm provided on the disk entrance side and the exit side of the disk is inserted into the pin insertion hole of the caliper bracket fixed to the vehicle body on the disk rotor action part side, and the disk axial direction In a pin slide type caliper body of a vehicle disc brake that is slidably supported on the outer side of the caliper body, the side ribs on the disk inlet side and the outlet side of the caliper body and the center ribs between the cylinder holes are formed The side ribs are provided so as to protrude in parallel to each other in the disk axial direction, and the bridge portion extends from the reaction part to the disk axial direction. Linearly extending in the direction away from each other by the action portion and continuing to the pin support arms, respectively, and the side ribs are continuously formed in the shape of concave grooves in the disk axial direction, the center rib is , Extending linearly in the disk axial direction from the reaction part to the action part via the bridge part, and continuously forming a hollow part in the disk axial direction in the center rib from the bridge part to the upper part of the reaction part. In addition, a thinning portion is formed in the working portion, and a rib in the disk rotating direction is formed between both the thinning portions of the center rib, and the bridge as a whole is formed by the center rib and the rib in the disk rotating direction. has a generally H-shaped when viewed from the section direction, between the side ribs and the center rib of the bridge portion, viewable friction pads disposed on opposite sides the bridge portion Pin slide type caliper body of a vehicular disk brake, characterized in that the formation of the mouth.

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