JP4726918B2 - Caliper body for disc brakes for vehicles - Google Patents

Description

  The present invention relates to a caliper body for a vehicle disc brake, and more particularly to a structure of a caliper body of a monocoque structure radial mount type piston facing type in a disc brake used in various traveling vehicles such as motorcycles and automobiles, and more particularly to a caliper body. The present invention relates to a structure of a liquid passage hole provided in the inside.

  As a vehicle disc brake, the working portion of the caliper body is disposed opposite to both sides of the disc rotor, and each working portion is provided with a cylinder hole that opens the piston to the disc rotor side. There is known a caliper body of a monocoque structure radial mount type piston opposed type vehicle disk brake in which mounting bolt insertion holes in the disk radial direction are provided on both sides in the rotational direction.

  In this caliper body, it is necessary to form a fluid passage hole to be supplied to the fluid pressure chamber while avoiding the mounting bolt insertion hole formed in one working portion. (For example, refer to Patent Document 1).

In addition, a first fluid passage hole drilled from one action portion provided with the attachment bolt insertion hole toward the hydraulic chamber of the cylinder hole of the other action portion, and a fitting bolt insertion hole from one action portion. Also passes through the outside and passes through the second fluid passage hole drilled toward the hydraulic chamber of the cylinder hole of one working portion and the second working portion through the outside from the mounting bolt insertion hole. An auxiliary liquid passage hole drilled toward the liquid passage hole, the auxiliary liquid passage hole intersects the first liquid passage hole, and a union hole is formed at the intersecting portion with the first liquid passage hole. Are formed with respective bleeder holes (see, for example, Patent Document 2).
Japanese Utility Model Publication No. 7-12638 JP 2005-163820 A

  However, in the thing of the above-mentioned patent document 1, since a communicating pipe is used, the increase in the number of parts and the work man-hour was caused, and the cost reduction was prevented. Moreover, in the thing of patent document 2, since a liquid passage hole is formed so that it may pass an outer side rather than an attachment bolt insertion hole, while a caliper body enlarges and a liquid passage hole is complicatedly piped, it is processed. The man-hour was increasing. In addition, it is necessary to plug the opening opening on the outer surface of the caliper formed at the time of processing the second liquid passage hole and the auxiliary liquid passage hole with a plug.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a caliper body for a monocoque structure radial mount type piston-opposed vehicle disc brake in which a liquid passage hole can be easily formed without increasing the size of the caliper body.

In order to achieve the above object, the present invention is a caliper body having a monocoque structure in which a pair of action portions disposed opposite to each other with a disc rotor interposed therebetween are integrally formed with a bridge portion straddling the outer periphery of the disc rotor, For monocoque structure radial mount type piston-facing type vehicle equipped with cylinder holes for accommodating pistons provided respectively and mounting bolt insertion holes in the disk radial direction provided on both sides of the disk rotating direction of one working part In the caliper body of the disc brake, one working part as a fluid passage hole for supplying hydraulic fluid to a hydraulic chamber defined between the bottom part of each cylinder hole and the piston accommodated in the cylinder hole A first fluid passage hole is bored from the outside of the mounting bolt insertion hole to the fluid pressure chamber of the cylinder hole of the other action portion, and the other action With bored a second fluid hole toward the hydraulic pressure chamber of the cylinder bore through between the attachment bolt insertion hole and one of the working portion of the cylinder bore from the side, the said first liquid hole second The liquid passage hole is communicated by intersecting on the other working part side with respect to the center line of the caliper body perpendicular to the disk axis, and is connected to the outer surface opening of one of the first liquid passage hole and the second liquid passage hole. A union hole is formed, and a bleeder hole is formed in one of the other outer surface openings.

  According to the caliper body of the disc brake for a vehicle of the present invention, the hydraulic chambers facing the both sides of the disc rotor can be communicated with each other by the first fluid passage hole and the second fluid passage hole with a small number of processing steps. The length of each fluid passage hole from the union hole to the fluid pressure chamber can be made as short as possible, and the braking force can be obtained efficiently. Further, since the liquid passage hole can be formed inside the caliper body rather than the mounting bolt insertion hole, the caliper body can be reduced in size and weight.

  1 to 6 are views showing an example of a monocoque radial mount type piston-facing caliper body of a vehicle disc brake according to the present invention. FIG. 1 is a sectional view taken along the line II in FIG. 4, and FIG. FIG. 3 is a sectional view taken along the line III-III of FIG. 4, FIG. 4 is a front view of the disc brake, FIG. 5 is a plan view of the disc brake, and FIG.

  The disc brake 1 is a monocoque in which a pair of action portions 3a and 3b arranged opposite to each other with a disc rotor 2 rotating in the direction of arrow A together with a wheel when the vehicle moves forward are integrally formed with a bridge portion 3c straddling the outer periphery of the disc rotor 2. It has a caliper body 3 having a structure.

  Each operating portion 3a, 3b is provided with two cylinder holes 4 opened on the disk rotor 2 side so as to face each other. In each cylinder hole 4, a piston 5 is accommodated via a piston seal 6 and a dust seal 7, and is formed in a four-pot piston facing type, and the bottom of each cylinder hole 4 and the bottom surface of each piston 5 are formed. In the meantime, hydraulic chambers 8 to which hydraulic fluid is supplied are respectively defined.

  On the opening side of the cylinder hole 4, friction pads 9 composed of a lining 9 a and a back plate 9 b are arranged so as to face each other with the disk rotor 2 interposed therebetween. The friction pad 9 has a back plate 9b suspended by a hanger pin 10 straddling the outer periphery of the disc rotor in the disc axial direction, and torque receiving portions 3d provided on the disc inlet side and the outlet side, respectively. 3e can be moved in the disk axial direction.

  On the disk insertion side and the extraction side of one working portion 3a, there are provided mounting bolt insertion holes 3f, 3f in the radial direction of the disk, and the mounting bolts inserted into the mounting bolt insertion holes 3f, 3f are connected to the vehicle body side. The caliper body 3 is attached to the vehicle body by being screwed to the caliper attaching portion provided on the body.

In each action part 3a, 3b, the fluid pressure chamber side communication parts 11, 11 for communicating adjacent fluid pressure chambers 8 are provided. Further, on the disk delivery side of the caliper body 3, the first working part 3 a is directed from the outside from the mounting bolt insertion hole 3 f on the disk delivery side toward the hydraulic chamber 8 in the cylinder hole 4 of the other action part 3 b. One fluid passage hole 12 is formed, and the cylinder hole of one action part 3a passes from the other action part 3b side through between the mounting bolt insertion hole 3f on the disk delivery side and the cylinder hole 4 of one action part 3a. A second fluid passage hole 13 is formed toward the four fluid pressure chambers 8. Further, the first liquid passage hole 12 and the second liquid passage hole 13 are communicated by intersecting at a crossing portion C1 formed on the other action portion 3b side with respect to the center line L1 of the caliper body perpendicular to the disc axis. In addition, an angle A1 between the center line L1 and the second liquid passage hole 13 is set to be larger than an angle A2 between the center line L1 and the first liquid passage hole 12.

  Further, a union hole 12a is formed in the outer surface opening of the first liquid passage hole 12, a bleeder hole 13a is formed in the second liquid passage hole 13, and a union bolt of a brake hose is formed in the union hole 12a. The brewer screws 14 are screwed into the respective parts.

  As a result, the hydraulic chambers 8 facing both sides of the disk rotor 2 can be communicated with each other by the first liquid passage hole 12 and the second liquid passage hole 13 with a small number of processing steps, and the hydraulic chamber can be communicated from the union hole 12a. The liquid through holes 12 and 13 up to 8 can be formed with as short a length as possible while avoiding the mounting bolt insertion holes 3f, and a braking force can be obtained efficiently.

  In the above-described embodiment, the first liquid passage hole is provided with a union hole, and the second liquid passage hole is provided with a bleeder hole. However, the present invention is not limited to this, and the second liquid passage hole is provided with a union hole. A bleeder hole may be provided in the first liquid passage hole. Further, the present invention can be applied not only to a 4-pot opposed caliper body but also to an opposed caliper body having 2 pots or 6 pots or more.

It is II sectional drawing of FIG. It is II-II sectional drawing of FIG. It is III-III sectional drawing of FIG. It is a front view of a disc brake showing an example of the present invention. It is a top view of a disk brake similarly. It is a perspective view of a disk brake similarly.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Disc brake, 2 ... Disc rotor, 3 ... Caliper body, 3a, 3b ... Action part, 3c ... Bridge part, 3d ... Opening part, 3d, 3e ... Torque receiving part, 3f ... Mounting bolt insertion hole, 4 ... Cylinder Holes, 5 ... piston, 6 ... piston seal, 7 ... dust seal, 8 ... hydraulic chamber, 9 ... friction pad, 9a ... lining, 9b ... back plate, 10 ... hanger pin, 11 ... hydraulic chamber side communication part, 12 ... 1st liquid passage hole, 12a ... Union hole, 13 ... 2nd liquid passage hole, 13a ... Breuder hole, 14 ... Breuder screw, C1 ... Intersection, L1 ... Center line

Claims (1)

A caliper body having a monocoque structure in which a pair of action portions disposed opposite to each other with a disc rotor interposed therebetween is integrally formed with a bridge portion straddling the outer periphery of the disc rotor, and a piston accommodating cylinder hole provided in each of the action portions, In the caliper body of a monocoque structure radial mount type piston opposed vehicle disc brake having mounting bolt insertion holes in the disk radial direction provided on both sides of the disk rotating direction of one working portion, As a fluid passage hole for supplying hydraulic fluid to the fluid pressure chamber defined between the bottom portion and the piston accommodated in the cylinder hole, the other one from the outside of the mounting bolt insertion hole of the one action portion the first liquid hole drilled toward the hydraulic pressure chamber of the cylinder bore of the working portion, the attachment bolt insertion hole and one from the other of the working portion A second fluid passage hole is formed through the cylinder hole of the action portion toward the hydraulic chamber of the cylinder hole, and the first fluid passage hole and the second fluid passage hole are orthogonal to the disk axis. The other working part side crosses the center line of the caliper body and communicates, and a union hole is formed in one of the first liquid passage hole and the second liquid passage hole, and the other outer face opening. A caliper body for a disc brake for a vehicle, characterized in that a bleeder hole is formed in each part.

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