JP2006064026A - Pin-slide type disc brake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pin-slide type disc brake device which suppresses variations in slide pin pitches to improve a slidableness. <P>SOLUTION: In a pin-slide type disc brake device, a pair of slide pins 28 abutted to one side surface of a pair of arm parts 22a respectively protruded to both sides of a caliper 22 are screwed with a pair of pin bolts 29 inserted from the other side surface of the arm part 22a, and inserted into a slide hole 27a opened in a mounting 27 supported by a vehicle body. By so doing, the caliper 22 slides in an axial direction of a disc rotor 21 with respect to the mounting 27. While one side surface of a pair of arms 22a are formed in a recessed wedge shape, the abutted surface of the slide pin 28 is formed in a protruded wedge shape to be fitted into the recessed wedge shape. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a disc brake device, and more particularly to a pin slide type disc brake device.

Conventionally, a disk brake device for an automobile, in particular, a pin slide type disk brake device is known (for example, Patent Documents 1 and 2). This pin slide type disc brake device is provided at the base end of the slide pin so that the slide pin does not rotate by tightening the pin bolt when the slide pin is attached to a pair of arms projecting on both sides of the caliper. The step provided on the flange and the arm is in contact with the flange.
Shoko 56-55461 Utility Kaihei 3-14328

  By the way, the portion where the slide pin and the arm portion of the above-mentioned Patent Document 1 are in contact will be described with reference to FIGS. 2 and 3A and 3B. 2 is a cross-sectional view of the contact portion of the slide pin, FIG. 3A is a perspective view of the arm portion 2a of the caliper, and FIG. 3B is a view showing the contact portion when FIG. 2 is viewed downward. . A slide pin hole 6 is formed in the caliper arm 2a so as to penetrate in the axial direction (vertical direction in FIG. 2) of the disk rotor. The contact surface 8a of the slide pin 8 is brought into contact with the side surface of the arm portion 2a on the disk rotor side, and the slide pin 8 is pinned by a pin bolt 9 penetrating the slide pin hole 6 from the side surface opposite to the disk rotor side of the arm portion 2a. Is attached to the arm 2a. That is, the slide pin 8 is fixed to the arm portion 2a of the caliper by screwing the male screw portion 9a at the tip of the pin bolt 9 and the female screw portion 8b formed in the contact surface 8a of the slide pin 8.

  When the slide pin 8 is fixed to the caliper arm 2a, as shown in FIG. 3, a step 2b is provided on the side of the arm 2a on the disk rotor side. Then, the chamfered portion 8c of the flange of the slide pin 8 abuts on the step 2b, so that the step 2b plays a role of preventing the slide pin 8 from rotating. That is, the slide pin 8 that has received the tightening torque of the pin bolt 9 rotates in the direction of M and hits the point B of the step 2b. Thereby, the joint rotation of the slide pin 8 is prevented.

  Further, the slide pin hole 6 of the arm portion 2a is larger than the shaft diameter of the pin bolt 9 that passes therethrough in order to absorb dimensional variations due to manufacturing accuracy and the like. Therefore, the clearance between the slide pin hole 6 and the shaft portion of the pin bolt 9 is large.

  Due to the structure as described above, when the slide pin 8 receiving the tightening torque of the pin bolt 9 hits the point B of the step 2b, the reaction force causes the slide pin 8 and the pin bolt 9 to be integrated in the opposite direction to the step 2b. Moving. Then, it tries to move until the shaft portion of the pin bolt 9 hits the slide pin hole 6. However, it is not only the case of moving until the shaft part of the pin bolt 9 and the slide pin hole 6 come into contact. If the friction coefficient between the contact surface 8a of the slide pin 8 and the seat surface 2c of the arm portion 2a is high, the movement amount of the integrated slide pin 8 and pin bolt 9 is small, and it may stop without hitting the slide pin hole 6. is there. For this reason, the variation in the position of the slide pin 8 at the time when the tightening of the pin bolt 9 is completed is large, and as a result, the distance “slide pin pitch” between the pair of slide pins 8 becomes large.

  When the variation of the slide pin pitch increases, the slide hole 7a formed in the mounting 7 supported by the vehicle body shown in FIG. 2 and the shaft portion of the slide pin 8 are stretched, and smooth sliding of the slide pin 8 is hindered. There is a concern that it will be. In order to prevent this, a measure to increase the diameter of the slide hole 7a is conceivable. However, when the vehicle travels, a sound is generated between the slide hole 7a and the shaft portion of the slide pin 8, so The clearance can be only about 0.14 mm to 0.18 mm, and the diameter of the slide hole 7a cannot be increased. As a result, there are lots that cannot absorb the variation of the slide pin pitch, and slide failure occurs due to the contact between the slide pin 8 and the slide hole 7a. Therefore, the drag due to the contact between the pad and the disc rotor, pad wear, brake noise / noise, vibration Such problems will occur.

  Note that the same problem as described above also occurs at the portion where the slide pin and the arm portion of Patent Document 2 are in contact with each other. In Patent Document 2, a step 2 b is formed around the slide pin hole 6. However, even if the step 2b is provided in the periphery, the clearance between the slide pin hole 6 and the shaft portion of the pin bolt 9 is large, and the friction between the contact surface 8a of the slide pin 8 and the seat surface 2c of the arm portion 2a. This is because the problem does not change depending on the coefficient.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a pin slide type disc brake device that suppresses variations in slide pin pitch and improves slidability.

In order to solve the above problems, according to one aspect of the present invention,
A pair of slide pins that contact one side surface of the pair of arm portions projecting on both sides of the caliper are screwed together by a pair of pin bolts inserted from the other side surface of the arm portion, and are opened in a mounting supported by the vehicle body. A pin slide type disc brake device in which the caliper slides in the axial direction of the disc rotor with respect to the mounting by being inserted into the slide hole,
A pin slide type disc brake characterized in that a concave wedge shape is provided on one side surface of the pair of arm portions, and a convex wedge shape is provided on a contact surface of the slide pin so as to be fitted into the concave wedge shape. An apparatus is provided.

Or, according to another aspect,
A pair of slide pins that contact one side surface of the pair of arm portions projecting on both sides of the caliper are screwed together by a pair of pin bolts inserted from the other side surface of the arm portion, and are opened in a mounting supported by the vehicle body. A pin slide type disc brake device in which the caliper slides in the axial direction of the disc rotor with respect to the mounting by being inserted into the slide hole,
A pin slide type disc brake characterized in that a convex wedge shape is provided on one side surface of the pair of arms, and a concave wedge shape is provided on a contact surface of the slide pin so as to be fitted into the convex wedge shape. An apparatus is provided.

  In these aspects, the contact portion between the caliper arm portion and the slide pin is fitted in an uneven wedge shape, thereby positioning by the wedge effect, suppressing variations in the slide pin pitch, and by contacting the slide pin and the slide hole. Slidability can be improved without causing poor sliding.

  According to the present invention, variation in slide pin pitch can be suppressed and slidability can be improved.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1A is an overall view of a pin slide type disc brake device according to an embodiment of the present invention. In the figure, reference numeral 21 denotes a disk rotor which is configured to rotate integrally with a wheel. A caliper 22 of the disc brake device is disposed so as to straddle the disc rotor 21. Further, the mounting 27 supported by the vehicle body is provided with an inner pad 23 and an outer pad 24 so that the disc rotor 21 is sandwiched.

  The caliper 22 is provided with a pressurizing mechanism 25 composed of a piston and a cylinder. An inner pad 23 is integrally attached to the piston of the pressurizing mechanism 25. On the other hand, the outer pad 24 is fixed to the caliper 22.

  FIG. 1B is a cross-sectional view of a contact portion of the slide pin 28. A slide pin hole 26 is formed through the arm 22 a of the caliper 22 in the axial direction of the disk rotor 21. As shown in FIG. 4, the abutting surfaces 28a and 28b of the slide pin 28 are brought into contact with the side surface of the arm portion 22a on the disk rotor 21 side, and the arm portion 22a is slid from the side surface opposite to the disc rotor 21 side. The slide pin 28 is attached to the arm portion 22a by a pin bolt 29 penetrating the pin hole 26. That is, the slide pin 28 is fixed to the arm portion 22 a of the caliper 22 by screwing the male screw portion at the tip of the pin bolt 29 and the female screw portion 28 c formed in the contact surfaces 28 a and 28 b of the slide pin 28.

  Returning to FIG. 1, the distal end portion of the slide pin 28 fixed to the arm portion 22 a of the caliper 22 is slidably inserted into a slide hole 27 a formed in the mounting 27. That is, the caliper 22 is supported with respect to the mounting 27 so as to be movable in the axial direction of the disk rotor 21.

  A rubber pin boot 30 is mounted between the slide pin 28 and the opening of the slide hole 27a. The pin boot 30 has a role of dust-proofing the sliding part. Further, by interposing the rubber pin boot 30 between the slide pin 28 and the opening of the slide hole 27a, an effect of matching the axis of the slide pin 28 and the axis of the slide hole 27a can be expected. Improved slideability.

  Therefore, according to the above configuration, the pin slide type disc brake device generates a braking force as follows. When hydraulic pressure is introduced into the cylinder of the pressurizing mechanism 25 by a brake operation, the piston in the pressurizing mechanism 25 moves. As the piston moves, the inner pad 23 is pressed against the disk rotor 21. Further, since the slide hole 27 a and the slide pin 28 are configured to be slidable, the caliper 22 moves according to the reaction force with which the inner pad 23 is pressed against the disk rotor 21, and the outer pad 24 is also pressed against the disk rotor 21. Is done.

  Further, when the brake is released, the piston in the pressurizing mechanism 25 moves backward due to a decrease in the hydraulic pressure of the cylinder in the pressurizing mechanism 25. As a result, the inner pad 23 and the outer pad 24 are separated from the disc rotor 21 and the braking force of the pin slide type disc brake device is released.

  Now, the contact portion of the slide pin 28 will be described in more detail. As shown in FIGS. 1 and 4, the contact portion of the slide pin 28 has a convex wedge shape having contact surfaces 28a and 28b. The arm portion 22 a has a concave wedge shape having a ridge line 22 b in a direction perpendicular to both the axial direction of the slide pin 28 and the pitch direction of the pair of slide pins 28. The pitch of the concave wedge-shaped ridge lines 22 b provided on the pair of arm portions 22 a is set to be the same as the pitch of the pair of slide pins 28. And the convex wedge shape of the slide pin 28 and the concave wedge shape of the arm part 22a are fitted in the state screwed by the pin bolt 29.

  FIG. 5 is an enlarged view of a contact portion between the convex wedge shape of the slide pin 28 and the concave wedge shape of the arm portion 22a. If the ridge angle of the convex wedge shape is θp and the inner angle on the contact side of the concave wedge shape is θc, there is a relationship of θc = θp (FIG. 5A).

  FIG. 6 is a view as viewed from A in FIG. 5, and shows the reaction force acting on the slide pin 28 when the pin bolt 29 is tightened. The reaction force is indicated by an arrow. When θc = θp, the contact surfaces 28a and 28b of the slide pin 28 are in contact with the seating surface of the arm portion 22a. Therefore, as shown in FIG. 6, since the reaction force acting on the slide pin 28 becomes a couple around the center of the pin bolt 29, the slide pin 28 moves in either the left-right direction or the up-down direction in FIG. Not to do. Even if the coefficient of friction is locally different and an unbalance occurs in the couple, the shape is a wedge shape, so that positioning is performed by the effect of the wedge. That is, the axis of the pin bolt 29, the axis of the slide pin hole 26, the axis of the slide pin 28, and the axis of the slide hole 27a are on the same line.

  Therefore, variation in the slide pin pitch can be suppressed, and the slide performance can be improved without causing a slide failure due to the contact between the slide pin 28 and the slide hole 27a.

  As for the processing accuracy of θc and θp, it is preferable that θc = θp as much as possible. However, when θc> θp as shown in FIG. 5B, the perpendicularity of the slide pin 28 to the arm portion 22a is deteriorated. This is not preferable because there is a fear (FIG. 5B is exaggerated for visual clarity). Therefore, it is preferable to process with a one-sided tolerance that does not satisfy θc> θp. If the relationship that the reaction force acting on the slide pin 28 is a couple around the center of the pin bolt 29 is maintained, the sharp wedge-shaped ridge line 22b can be chamfered.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention. Can be added.

  In the embodiment described above, the slide pin 28 has a convex wedge shape and the arm portion 22a has a concave wedge shape. However, the slide pin 28 has a concave wedge shape and the arm portion 22a has a convex shape. The wedge shape has the same effect as the above-described embodiment.

It is a figure which shows the pin slide type disc brake apparatus which is one Example of this invention. It is sectional drawing of the contact part of a slide pin. It is a figure which shows the contact part of the arm part 2a. It is a figure which shows the relationship at the time of the slide pin 28 and the arm part 22a contact | abutting. It is an enlarged view of the contact part of the convex wedge shape of the slide pin 28 and the concave wedge shape of the arm part 22a. FIG. 6 is a view as viewed from A in FIG. 5, showing reaction force acting on the slide pin 28 when the pin bolt 29 is tightened.

Explanation of symbols

21 Disc rotor 22 Caliper 22a Arm part 22b Ridge line 26 Slide pin hole 27 Mounting 27a Slide hole 28 Slide pin 28a, 28b Contact surface 28c Female thread part 29 Pin bolt

Claims (2)

A pair of slide pins that contact one side surface of the pair of arm portions projecting on both sides of the caliper are screwed together by a pair of pin bolts inserted from the other side surface of the arm portion, and are opened in a mounting supported by the vehicle body. A pin slide type disc brake device in which the caliper slides in the axial direction of the disc rotor with respect to the mounting by being inserted into the slide hole,
A pin slide type disc brake characterized in that a concave wedge shape is provided on one side surface of the pair of arm portions, and a convex wedge shape is provided on a contact surface of the slide pin so as to be fitted into the concave wedge shape. apparatus. A pair of slide pins that contact one side surface of the pair of arm portions projecting on both sides of the caliper are screwed together by a pair of pin bolts inserted from the other side surface of the arm portion, and are opened in a mounting supported by the vehicle body. A pin slide type disc brake device in which the caliper slides in the axial direction of the disc rotor with respect to the mounting by being inserted into the slide hole,
A pin slide type disc brake characterized in that a convex wedge shape is provided on one side surface of the pair of arms, and a concave wedge shape is provided on a contact surface of the slide pin so as to be fitted into the convex wedge shape. apparatus.

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