JP2009127646A - Pin slide type disk brake for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pin slide type disk brake for a vehicle capable of securing slidability of a caliper body even when the caliper body deforms by braking torque during braking by a simple structure. <P>SOLUTION: A mounting arm 5b of a slide pin 4 is provided to a caliper bracket 3, and the slide pin 4 is projectingly provided to the mounting arm 5b by a mounting bolt 6. A caliper supporting arm 3a equipped with a guide hole 3b for movably storing the slide pin 4 is provided to the caliper body 5. A fitting part 5g of a mounting seat 4a of the slide pin 4 having a home base-shaped pentagon in plan view is provided to the mounting arm 5b. The mounting seat 4a is formed into a pentagon slightly smaller than the fitting part 5g, and a positioning part is configured by a side 5h (projected part) having the longest length of the fitting part 5g and a long side part 4d (recessed part) of the mounting seat 4a. Chamfered parts 4e, 4f which are outer diameter reduced parts are formed on a disk turn-out side face and a disk turn-in side face during advancement of the vehicle in a state of the slide pin 4 mounted on the mounting arm 5b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pin slide type vehicular disc brake mounted on a vehicle such as an automobile or a motorcycle or a tricycle, and more particularly to a structure of a slide pin for guiding a caliper body in a disc axial direction.

In a pin slide type disc brake for a vehicle, a slide pin is protruded from a caliper body, and a caliper support arm having a bag-like guide hole for movably accommodating the slide pin is provided in a caliper bracket to guide the slide pin. Thus, the caliper body is provided so as to be movable in the disk axial direction (for example, see Patent Document 1).
JP 2002-257164 A

  In the pin slide type disc brake as described in Patent Document 1 described above, the brake torque from the friction pad is received by the caliper support arm provided on the caliper bracket, so that the caliper support arm is deformed to the disc delivery side by the large brake torque. Compared to the base end side of the caliper support arm on the vehicle body mounting side, the tip side of the caliper support arm on the anti-vehicle body mounting side is deformed to the disk delivery side, so that the slide pin is inclined with respect to the guide hole Thus, the guide hole and the slide pin are slid in a state of strong point contact, and there is a possibility that the slidability of the caliper body is lowered.

  Therefore, the present invention provides a vehicle with a simple structure that can ensure the slidability of the caliper body even when the caliper bracket is deformed by the braking torque during braking and the slide pin is inclined with respect to the guide hole. It aims to provide a pin slide type disc brake.

  In order to achieve the above object, according to a first aspect of the present invention, there is provided a pair of slide pin mounting arms on a caliper body disposed straddling the outer side of the disk rotor, and the slide pins project from the mounting arms by mounting bolts. The caliper bracket fixed to the vehicle body at one side of the disc rotor is provided with a caliper support arm having a guide hole for movably receiving the slide pin, and the caliper body is guided by the slide pin to the disc shaft. In a vehicular pin slide type disc brake that is movably supported in a direction, a positioning portion that positions the slide pin in the circumferential direction around the bolt hole on the base end side of the slide pin and around the bolt insertion hole of the mounting arm The slide pin is mounted on the mounting arm on the slide shaft that slides in the guide hole of the slide pin. In such a state, at least the disk unwinding side surface at the time of forward movement of the vehicle and the distal end surface of the disk unloading side are provided with an outer diameter reducing portion, and a gap is provided between the outer diameter reducing portion and the guide hole. It is a feature.

  In a second aspect of the invention, the outer diameter reducing portion is configured such that the disc feeding side and the disc feeding side when the slide shaft portion moves forward in the vehicle advance direction in the disc radial direction with the slide pin attached to the mounting arm. It is characterized by being chamfered.

  In the third invention, a mounting seat is provided at a base end of the slide pin, and a fitting portion for fitting the mounting seat into the mounting arm is provided, and the positioning portion is a recess formed in an outer peripheral portion of the mounting seat; The positioning portion is provided corresponding to at least one of the disk feeding side and the disk feeding side of the mounting seat and the fitting portion. It is a feature.

  According to the vehicle pin slide type disc brake of the present invention, the slide pin positioning portion is formed around the bolt hole on the base end side of the slide pin and around the bolt insertion hole of the mounting arm. The direction of insertion into the guide hole is determined. Furthermore, when the vehicle moves forward, a gap is formed between at least the disk unwinding side surface and the disk unwinding side end surface of the slide pin and the guide hole, so that the caliper support arm receives a large braking torque during braking, Even if the tip side of the caliper support arm on the side opposite to the vehicle body is deformed in the direction of turning the disc and the slide pin is inclined with respect to the guide hole, it slides in a state where the guide hole and the slide pin are in strong point contact. This can prevent the caliper body from sliding. Also, when braking when the vehicle is moving backward, a large braking torque is not applied to the caliper bracket as much as when the vehicle is moving forward.Therefore, at least the disk unwinding side and the disk unwinding side front end surface of the slide pin should be provided with an outer diameter reducing portion. That's fine.

  Furthermore, by forming the outer diameter reduced part by chamfering the disk feeding side and the disk feeding side of the sliding shaft part, the outer diameter reduced part can be easily formed and formed in the disk radial direction. Therefore, the outer diameter reduced portion is orthogonal to the disk rotation direction, and the caliper body can be more effectively slidable.

  Further, the positioning portion is a combination of a concave portion formed on the outer peripheral portion of the mounting seat of the slide pin and a convex portion formed on the fitting portion of the seating surface provided on the mounting arm, and at least any of the disk feeding side surface and the disk feeding side surface By providing on either side, a slide pin can be assembled | attached favorably with a simple structure.

  FIG. 1 to FIG. 6 show a first embodiment of a pin slide type disc brake for a vehicle according to the present invention. FIG. 1 is a sectional plan view of an essential part of a disc brake in a non-braking state when a friction pad is new, and FIG. FIG. 3 is a sectional view taken along the line III-III in FIG. 2, FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2, FIG. 5 is a sectional view taken along the line VV in FIG. It is -VI sectional drawing. An arrow A in the figure indicates the rotational direction of the disc rotor during forward traveling of the vehicle, and the disc brake turn-in side and the outlet side used in the following description are for forward travel of the vehicle.

  A pin slide type disc brake 1 includes a caliper bracket 3 fixed to a vehicle body at one side of a disc rotor 2 and a pair of caliper support arms 3a and 3a extending in the disc axial direction on the outer periphery of the disc rotor 2. The caliper body 5 is supported by the caliper support arms 3a and 3a via a pair of slide pins 4 and 4 so as to be movable in the disk axis direction. Each slide pin 4 is an action portion of the caliper body 5. Mounting arms 5b and 5b projecting to both sides of 5a are respectively provided by mounting bolts 6. Each caliper support arm 3a has a bag-like guide hole 3b for slidably receiving the slide pin 4, respectively. Is formed.

  The caliper bracket 3 is fixed by screwing fixing bolts inserted into the vehicle body attachment portions 3c and 3c at one side of the disc rotor 2 to the vehicle body (both not shown). The pair of caliper support arms 3a, 3a projecting in the direction of the action portion 5a while sandwiching the disc rotor turn-in side and the turn-out side of the bridge portion 5c of the caliper body 5 across the outside of the disc rotor 2 is provided. It is extended. Further, torque receiving steps 3d and 3d for receiving braking torque are formed on the opposing surfaces of the caliper support arms 3a and 3a, and the opposite side of the caliper support arms 3a and 3a to the vehicle body is connected by a connecting arm 3e. ing.

  The caliper body 5 includes an action portion 5a and a reaction portion 5d that are arranged to face both sides of the disc rotor 2, and a bridge portion 5c that connects the caliper support arms 3a and 3a across the outer periphery of the disc rotor 2. It has become. The action portion 5a is provided with the mounting arms 5b and 5b described above, the cylinder hole 8 in which the piston 7 is accommodated, and the hydraulic chamber 9 defined at the bottom of the cylinder hole 8, and the reaction portion 5d. Are provided with reaction force claws 5e, 5e. Between the piston 7 and the reaction force claw 5e, a pair of friction pads 10 and 10 are disposed opposite to each other with the disc rotor 2 interposed therebetween.

  The friction pad 10 includes a lining 11 that is in sliding contact with the side surface of the disk rotor 2 and a metal back plate 12 formed on the caliper support arms 3a and 3a. Ear pieces 12a and 12a project from both sides of the back plate 12, and each friction pad 10 locks the ear pieces 12a and 12a to the torque receiving steps 3d and 3d of the caliper support arms 3a and 3a. The torque receiving step portions 3d and 3d are suspended so as to be slidable in the disk axial direction.

  A bolt hole 5f is formed through the tip of each mounting arm 5b in the disk axial direction, and a fitting portion 5g of the mounting seat 4a of the slide pin 4 is formed around the bolt hole 5f. The insertion part 5g is formed in a pentagonal shape with a home base shape in plan view, and the insertion part 5g on the disk delivery side has the longest side 5h (convex part of the present invention) formed on the disk delivery side. In the side insertion portion 5g, the longest side 5h on the disk delivery side is formed.

  Each slide pin 4 includes a sliding shaft portion 4b on the distal end side that slides in the guide hole 3b and a fixed shaft portion 4c having a diameter larger than that of the sliding shaft portion 4b. A mounting seat 4a for the mounting arm 5b is formed on the end side. The mounting seat 4a has the same shape as the fitting portion 5g and is formed in a pentagonal shape slightly smaller than the fitting portion 5g, and the sliding shaft portion 4b has the longest side portion 4d of the mounting seat 4a (in the present invention). The first chamfered portion 4e in the axial direction is formed on the same axis as the concave portion, and the second chamfered portion 4f is formed on the surface facing the first chamfered portion 4e. The fixed shaft portion 4c is formed with a female screw hole 4g that opens to the base end surface of the mounting seat 4a. In this embodiment, the positioning part is configured by the longest side part 4d of the mounting seat 4a and the longest side 5h of the fitting part 5g.

  The slide pin 4 on the disk delivery side has the long side part 4d facing the disk delivery side, the mounting seat 4a is fitted into the fitting part 5g of the mounting arm 5b on the disk delivery side, and the long side part 4d is fitted into the insertion part. Attaching the mounting bolt 6 to the bolt hole 5f of the mounting arm 5b from the side opposite to the disk rotor and screwing it into the female screw hole 4g of the slide pin 4 by bringing it into contact with the longest side 5h of 5g. It protrudes from the arm 5b. Further, the slide pin 4 on the disk insertion side has the long side portion 4d facing the disk extraction side, the mounting seat 4a is inserted into the insertion portion 5g of the mounting arm 5b on the disk insertion side, and the mounting bolt 6 is attached. By inserting into the bolt hole 5f of the arm 5b from the side opposite to the disk rotor and screwing it into the female screw hole 4g of the slide pin 4, the arm 5b protrudes from the mounting arm 5b on the disk insertion side.

  The slide pins 4 and 4 attached to the caliper body 5 are inserted into the guide holes 3b of the caliper bracket 3, respectively, near the openings of the guide holes 3b and 3b, and the fixed shaft portions 4c and 4c of the slide pins 4 and 4. The bellows-like dust boots 13 and 13 are respectively mounted between the outer peripheral portions of the two.

  By attaching the slide pins 4 and 4 as described above, the first chamfered portion 4e and the second chamfered portion 4f of each slide pin 4 are arranged in a direction parallel to the center line L1 passing through the disc center and the caliper body center. Accordingly, a gap E in the disk axial direction is formed between the inner peripheral surface of each guide hole 3b and the first chamfered portion 4e and the second chamfered portion 4f of each slide pin 4.

  In the disc brake 1 formed in this way, when hydraulic pressure generated in a well-known hydraulic master cylinder (not shown) is supplied to the hydraulic chamber 9, the piston 7 moves forward through the cylinder hole 8 toward the disc rotor. Then, one friction pad 10 is pressed against one side surface of the disk rotor 2. Next, by this reaction, the caliper body 5 is moved in the direction of the action portion 5a while being guided by the slide pins 4 and 4, and the reaction force claw 5e of the reaction portion 5d causes the other friction pad 10 to move to the disc rotor 2. A braking action is performed by pressing against the other side surface.

  The friction pads 10, 10 at the time of braking are dragged in the disk unwinding direction by the sliding contact between the disk rotor 2 and the lining 11, and the side end surfaces on the disk unwinding side of each back plate 12 are torque receiving steps 3 d, 3 d. The braking torque T1 generated in the friction pads 10, 10 is transmitted to the caliper support arm 3a on the disk delivery side.

  Due to the large braking torque T1, the side of the caliper support arm 3a that is far from the vehicle body mounting portions 3c and 3c is tilted in the direction of turning out the disk, and the slide pins 4 and 4 are tilted in the guide holes 3b and 3b. 2, there are gaps E in the disk axial direction between the first chamfered portion 4e and the second chamfered portion 4f of the slide pin 4 and the inner peripheral surface of the guide hole 3b, as shown in FIG. Since it is formed, the tip portion P1 on the disk insertion side and the guide hole 3b do not make strong point contact.

  Further, on the disk delivery side of the slide pin 4, the second chamfered part 4f is disposed at the position of the disk delivery side corner P2 of the guide hole 3b, and the sliding shaft part 4b is on the opening side of the guide hole 3b during braking. Even when sliding, the disc delivery side corner P2 and the disc delivery side of the sliding shaft 4b do not make strong point contact. Further, the position of the stepped portion P3 formed between the second chamfered portion 4f and the fixed shaft portion 4c is always located on the inner peripheral side of the dust boot 13 and does not enter the guide hole 3b. Therefore, there is no possibility that the dust boot 13 is pushed into the guide hole 3b along with the stepped portion P3, and so-called biting can be prevented.

  Thereby, the slidability of the caliper body 5 can be ensured, and a good braking force can always be obtained. In addition, since the outer peripheral surface of the disk feeding side and the feeding side are chamfered in the same manner to form the first chamfered portion 4e and the second chamfered portion 4f, the slide pin 4 on the disk feeding side and the disk feeding side are formed. The slide pins 4 on the side can have the same shape, and each slide pin 4 can be mounted on the mounting arm 5b on either the turn-out side or the turn-in side, so that the ease of assembly can be improved. .

  FIG. 7 is a cross-sectional view of an essential part of a disc brake showing a second embodiment of the present invention. Components that are the same as those in the first embodiment are given the same reference numerals, and detailed description thereof is omitted. To do.

  In this embodiment, the slide pin 4 is chamfered in the disk radial direction in the state where the slide pin 4 is attached to the mounting arm 5b, and the first chamfered portion 4h and the second chamfered portion 4 A chamfered portion 4i is formed. As a result, gaps E in the direction perpendicular to the disk rotation direction are formed between the guide hole 3b, the first chamfered portion 4h, and the second chamfered portion 4i, respectively, and the slidability of the caliper body is more effectively secured. be able to.

  FIGS. 8 and 9 show a third embodiment of the present invention. FIG. 8 is an enlarged sectional view of the main part of the disc brake. FIG. 9 is a sectional view taken along the line IX-IX in FIG. Components indicating the components are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this embodiment, each mounting arm 5b of the caliper body 5 has a convex portion 5i in the disk axial direction on the cylinder hole 8 side of the bolt hole 5f, and the mounting seat 4a of each slide pin 4 has the mounting seat 4a. A concave portion 4j is formed by cutting out a part of the concave portion 4j, and the concave portion 4j and the convex portion 5i constitute a positioning portion. The sliding shaft portion 4b of the slide pin 4 has a first chamfered portion 4e in the axial direction on the same axis line as the concave portion 4j, and a second chamfered portion 4f on the surface facing the first chamfered portion 4e. Is formed. By forming in this way, the concave portion 4j and the convex portion 5i can be formed with a simple structure, and the cost can be reduced.

  Note that the present invention is not limited to the case where the outer diameter reducing portions disposed on the disk feeding side and the disk feeding side are respectively chamfered portions in the axial direction, as in the above-described embodiments. The outer diameter decreasing portion on the side may be formed in the axial direction, and the outer diameter decreasing portion on the disk insertion side may be formed only on the tip portion of the sliding shaft. In addition, the outer diameter reduced portion is not limited to the one formed by chamfering the slide shaft portion of the slide pin having a circular cross section, and the outer diameter reduced portion is formed by forming the slide shaft portion into an elliptical cross section. You may do it. Furthermore, the present invention can also be applied to a multi-pot pin slide type disc brake.

It is a principal part sectional top view of the disc brake of the non-braking state at the time of the new friction pad which shows the example of the 1st form of the present invention. It is a principal part expanded sectional view of a disk brake similarly. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is IV-IV sectional drawing of FIG. It is VV sectional drawing of FIG. It is VI-VI sectional drawing of FIG. It is principal part sectional drawing of the disc brake which shows the 2nd form example of this invention. It is a principal part expanded sectional view of the disc brake which shows the 3rd form example of this invention. It is IX-IX sectional drawing of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Disc brake, 2 ... Disc rotor, 3 ... Caliper bracket, 3a ... Caliper support arm, 3b ... Guide hole, 3c ... Car body mounting part, 3d ... Torque receiving step part, 3e ... Connecting arm, 4 ... Slide pin, 4a ... mounting seat, 4b ... sliding shaft part, 4c ... fixed shaft part, 4d ... long side part, 4e ... first chamfered part, 4f ... second chamfered part, 4g ... female screw hole, 4h ... first chamfered part, 4i 2nd chamfered part, 4j ... recessed part, 5 ... caliper body, 5a ... action part, 5b ... mounting arm, 5c ... bridge part, 5d ... reaction part, 5e ... reaction force claw, 5f ... bolt hole, 5g ... fitting part 5 ... Longest side, 5i ... Projection, 6 ... Mounting bolt, 7 ... Piston, 8 ... Cylinder hole, 9 ... Hydraulic chamber, 10 ... Friction pad, 11 ... Lining, 11 ... Back plate, 12a ... Ear piece , 13 ... dust boot, L1 ... disc center and caliper Center line passing through the de-center

Claims (3)

A caliper body arranged across the outside of the disc rotor is provided with a pair of slide pin mounting arms, and the slide pins project from the mounting arms with mounting bolts, and fixed to the vehicle body at one side of the disc rotor. The caliper bracket is provided with a caliper support arm having a guide hole that movably accommodates the slide pin, and the caliper body is movably supported in the disk axial direction by the guide of the slide pin. In the disc brake, a positioning part for positioning the slide pin in the circumferential direction is formed around the bolt hole on the base end side of the slide pin and the bolt insertion hole of the mounting arm, and inside the guide hole of the slide pin. At least when the vehicle is moving forward with the slide pin mounted on the mounting arm on the sliding shaft A pin-sliding disc for a vehicle comprising an outer diameter reducing portion on a disc feeding side surface and a disc feeding side front end surface, and a gap is provided between the outer diameter reducing portion and the guide hole. brake. The outer diameter reducing portion is formed by chamfering the disk feeding side and the disk feeding side in the disk radial direction when the slide shaft is mounted on the mounting arm while the slide pin is mounted on the mounting arm. The pin slide type disc brake for a vehicle according to claim 1. A mounting seat is provided at the base end of the slide pin, and a fitting portion for fitting the mounting seat into the mounting arm is provided, and the positioning portion is formed in a recessed portion formed in an outer peripheral portion of the mounting seat and the fitting portion. 2. The structure according to claim 1, wherein the positioning part is provided corresponding to at least one of the disk delivery side and the disk delivery side of the mounting seat and the fitting part. Or the pin slide type disc brake for vehicles of 2.

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