JP5436387B2 - Vehicle disc brake - Google Patents

Description

  The present invention relates to a vehicle disc brake used in a traveling vehicle such as an automobile or a motorcycle, and more specifically, improves the ease of assembling a wheel with a disc rotor to a vehicle body and improves workability when replacing a friction pad. It is related with the structure which aims at improvement.

  When assembling the caliper body to the car body, the friction pad is prevented from tilting with respect to the disc rotor, improving the assembly of the caliper body and preventing the friction pad from dragging by reliably retracting the friction pad when braking is released. The shim plate attached to the back plate of the friction pad is provided with an engaging claw that engages with the inner peripheral wall of the piston and a pad return piece that is engaged with the back plate, and the shim plate is attached to the piston and the back plate. (For example, refer to Patent Document 1), a retainer having a dharma hole is provided at the tip of the piston, a locking means for the dharma hole is provided on the back plate of the friction pad, and the piston and the back There existed what connected the board via the retainer (for example, refer patent document 2). Furthermore, a pad hold spring protruding toward the inner peripheral wall of the piston is attached to the back plate of the friction pad, an engagement groove for engaging the pad hold spring is provided on the inner peripheral wall of the piston, and the pad hold spring is connected to the piston and the back plate. There was also what was connected via (for example, refer to patent documents 3).

JP-A-8-270692 JP 2001-336553 A JP 2003-56612 A

  In the above-mentioned patent documents, since the back plate of the friction pad and the piston are connected via a shim plate, a retainer, and a pad hold spring, the assembly of the caliper body to the vehicle body is improved and the friction is improved. Although it is possible to prevent the pad from being dragged, when replacing the friction pad, it requires a force to release the connection between the friction pad and the piston, and the friction pad and the piston via a shim plate, a retainer, a pad hold spring, etc. It took time to connect the friction pads, and it took time to replace the friction pads.

  Accordingly, the present invention provides a vehicle disc brake that can improve the ease of assembling a wheel with a disc rotor to the vehicle body and replace the friction pad in a short time in addition to preventing the friction pad from being dragged. It is intended to provide.

In order to achieve the above object, a vehicle disc brake according to the present invention is disposed so as to face a disc axial hanger pin laid on a caliper body on the disc rotor side, and is suspended from the hanger pin and sandwiching the disc rotor. a pair of friction pads, in the vehicular disc brake at least one and a bottomed cylindrical piston for pressing a side surface of the disk rotor of the friction pad, the claw portion in a ring shape on the tip inner periphery of the piston projecting formation, the back plate of said friction pad, engaged with the claw portion protruding the locking member for restricting the axial movement of the piston of the friction pad, the locking member, said back A shaft portion having a male screw portion to be screwed into a female screw portion formed on the friction pad non-bonding surface of the plate, and a large-diameter flange portion formed at the piston bottom side tip of the shaft portion; Large diameter flange portion is formed smaller in diameter than the inner diameter of the claw portion, the assembling position is hung on the hanger pin by assembling the friction pad to the caliper body, the claw portion at the time of assembly of the friction pad The large-diameter flange portion inserted on the piston bottom side moves outward or inward in the disk radial direction, the large-diameter flange and the claw portion are engaged, and the hanger pin is removed from the caliper body to By shifting the friction pad from the assembly position, the large-diameter flange portion engaged with the claw portion moves inward or outward in the disk radial direction, and the engagement state between the large-diameter flange and the claw portion is released. It is characterized by being possible.

Also, before Symbol caliper body, a piston in opposed, disc rotor rotation entrance side and the run-out side of the torque receiving of the caliper body in which a pair of the working portion having the piston, respectively, are disposed to face each other across the disk rotor A piston-facing type in which a pair of friction pads is disposed between the portions with the disk rotor interposed therebetween may be used.

  According to the vehicle disc brake of the present invention, when the friction pad is assembled to the caliper body, the locking member attached to the back plate of the friction pad is engaged with the claw portion formed on the piston. When a wheel with a disc rotor is assembled to the vehicle body, the friction pad does not tilt with respect to the disc rotor, and the disc rotor can be placed between the opposing friction pads. The wheel can be assembled to the car body. In addition, when the brake is released, the friction pad moves backward together with the piston, so that drag of the friction pad can be prevented. Furthermore, when replacing the friction pad, the friction pad can be easily removed by removing the hanger pin from the caliper body and then shifting the friction pad from the assembly position. Since it can be assembled simply by inserting the hanger pin after the engagement, the time required for replacing the friction pad can be shortened.

  Further, the claw portion is formed so as to protrude from the piston front end surface toward the inner peripheral side of the piston, and the locking member is formed by a shaft portion screwed to the back plate and a large-diameter flange portion formed at the tip end of the shaft portion. By doing so, the friction pad and the piston can be reliably connected by simply arranging the large-diameter flange portion on the piston bottom side of the claw portion, and the friction pad can be easily assembled to the caliper body. In addition, since the locking member only needs to be screwed into the back plate, it is easy to install, and the friction pad is not elastically engaged with the piston as in a conventional pad hold spring, etc. Since there is no possibility of the occurrence, the back plate of the friction pad and the piston can be connected in a stable state, and the durability of the locking member can be improved.

  Furthermore, it is applicable to a piston-facing disc brake, and has a structure in which a friction pad is arranged in a narrow space between the torque receiving portions provided on the disc rotor return side and the disc rotor return side of the caliper body. The friction pad can be exchanged satisfactorily.

It is II sectional drawing of FIG. 1 is a cross-sectional front view of a vehicle disc brake showing a first embodiment of the present invention. It is a partial cross-sectional exploded perspective view of a friction pad and a piston. It is a cross-sectional side view of the disk brake for vehicles which shows the 2nd example of the present invention.

  1 to 3 are views showing an example of a vehicle disc brake according to the present invention. A vehicle disc brake 1 shown in this embodiment includes a disc rotor 2 that rotates integrally with a wheel in the direction of arrow A when the vehicle moves forward, a caliper body 3 that is attached to the vehicle body at one side of the disc rotor 2, and a disc rotor. 2 and friction pads 4 and 4 disposed opposite to each other.

  The caliper body 3 is formed by connecting action portions 3a and 3a disposed on both sides of the disk rotor 2 with a bridge portion 3b, and one action portion 3a is attached to the vehicle body. Three cylinder holes 3c, 3d, and 3e are respectively provided in the acting portions 3a and 3a so as to face each other, and pistons 5, 6, and 7 are provided in the cylinder holes 3c, 3d, and 3e via piston seals 8, respectively. A hydraulic chamber 9 is defined between each piston 5, 6, 7 and the bottom wall of each of the cylinder holes 3 c, 3 d, 3 e. A substantially rectangular ceiling opening 3f penetrating inward and outward in the disk radial direction is formed at the center of the bridge portion 3b, and the torque receiving surface 3g is sandwiched between the disk rotor 2 and the inner side of the ceiling opening 3f in the disk radial direction. , 3h are continuously provided.

  The pistons 5, 6, and 7 are formed in a cylindrical shape with a bottomed cylindrical shape, and a claw portion 6 b that protrudes toward the inner peripheral side of the piston is formed in a ring shape over the entire circumference on the tip opening surface 6 a of the central piston 6. Is formed.

  Each friction pad 4 is formed by adhering four linings 4a that are in sliding contact with the side surface of the disk rotor 2 to one side surface of a single metal back plate 4b. The back plate 4b is provided with a hanging piece 4c projecting in the direction of the ceiling opening 3f at the center portion on the outer periphery side of the disk, and the female screw hole 4d at the center portion in the disk circumferential direction on the other side and on the outer side in the disk radial direction. The locking member 10 is attached to the female screw hole 4d. Each hanging piece 4c is formed with a hanger pin insertion hole 4e, and each friction pad 4 passes through the ceiling opening 3f and is provided with a hanger pin mounting hole 3i formed in both action portions 3a and 3a. , 3i is hung so as to be movable in the disk axial direction between the torque receiving surfaces 3g and 3h by inserting the hanger pin 11 spanned over the hanger pin insertion hole 4e.

  The locking member 10 is formed at a shaft portion 10b having a male screw portion 10a to be screwed into the female screw hole 4d of the back plate 4b, and a piston bottom side tip of the shaft portion 10b. A large-diameter flange portion 10c to be engaged and a hexagonal head portion 10e for attaching a shaft portion mounted on the piston bottom side of the large-diameter flange portion 10c are provided. The length of the shaft portion 10b is set to be equal to or slightly larger than the thickness of the claw portion 6b. The large-diameter flange portion 10c is formed to have a smaller diameter than the inner diameter of the claw portion 6b so that it can pass through the inside of the claw portion 6b, and a plurality of through holes 10d are formed on the flange surface in order to reduce the weight. The outer peripheral edge is chamfered so that the engagement with the claw portion 6b can be performed smoothly.

  The friction pads 4 and 4 of the vehicle disc brake 1 formed as described above are assembled by inserting the friction pads 4 between the torque receiving surfaces 3g and 3h of the caliper body 3 from the inner side in the disc radial direction. After the large-diameter flange portion 10c of the locking member 10 attached to the plate 4b is inserted inside the claw portion 6b formed in the central piston 6, the friction pads 4, 4 are further moved outward in the disk radial direction. The large-diameter flange portion 10c is arranged on the piston bottom side of the claw portion 6b to engage the large-diameter flange portion 10c and the claw portion 6b, and the hanging piece 4c of the friction pad 4 is projected to the ceiling opening portion 3f. The hanger pins 11 are inserted into the hanger pin mounting holes 3i, 3i and the hanger pin insertion holes 4e, 4e, and the friction pads 4, 4 are suspended from the caliper body 3. As a result, the large-diameter flange portion 10c is engaged with the piston bottom side of the claw portion 6b on the outer side in the disk radial direction, and the friction pads 4 and 4 are held by the piston 6 and the inclination is suppressed. The caliper body 3 in a state in which the friction pads 4 and 4 are assembled is assembled to the vehicle body by disposing the disc rotor 2 between the friction pads 4 and 4 and attaching the one action portion 3a to the vehicle body.

  Thus, according to the vehicle disc brake 1 of this embodiment, the claw formed by the large-diameter flange portion 10c of the locking member 10 on the piston 6 when the friction pads 4 and 4 are assembled to the caliper body 3. Since the friction pads 4 and 4 are held on the piston 6 by engaging with the piston bottom side of the portion 6b and the movement and inclination of the friction pad 4 are suppressed, when assembling the wheel with the disc rotor 2 to the vehicle body Further, since the friction pads 4 and 4 are not inclined with respect to the disk rotor 2 and the disk rotor 2 can be favorably disposed between the linings 4a and 4a of the opposing friction pads 4 and 4, the disk rotor 2 The wheel with can be assembled to the car body well. Moreover, since the friction pad 4 moves backward together with the piston 6 when the brake is released, the friction pad 4 can be prevented from dragging.

  Furthermore, when the friction pad 4 is replaced, after the hanger pin 11 is removed from the caliper body 3, the engagement between the locking member 10 and the claw portion 6b is performed by shifting the friction pad 4 from the assembly position to the inner side in the disk radial direction. The friction pad can be easily removed. When assembling a new friction pad, it can be easily assembled by simply inserting the hanger pin 11 through the hanger pin insertion hole 4e after the locking member 10 is arranged on the piston bottom side of the claw portion 6b. The time required to replace the pad 4 can be shortened. In particular, as in this embodiment, the friction pads 4 and 4 are arranged in a narrow space between the torque receiving surfaces 3g and 3h provided on the disk rotor retraction side and the disk rotor retraction side of the caliper body 3. However, the friction pad 4 can be satisfactorily replaced in a short time.

  Further, the claw portion 6b protrudes from the front end opening surface 6a of the piston 6 to the inner peripheral side of the piston and is formed in a ring shape, and a shaft portion 10b for screwing the locking member 10 to the back plate 4b; By forming with the large-diameter flange portion 10c formed at the tip, the directionality of the piston 6 and the locking member 10 is lost, the friction pad 4 and the piston 6 can be reliably connected with a simple structure, and the cost increases. There is no fear. Further, since the locking member 10 only needs to be screwed into the back plate 4b, it is easy to attach, and there is no possibility of causing settling unlike the spring material or the like. Therefore, the back plate 4b of the friction pad 4 and the piston 6 Can be connected in a stable state, and the durability of the locking member 10 can be improved.

  FIG. 4 shows a second embodiment of the present invention. Components that are the same as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In this embodiment, the ceiling opening 3j of the caliper body 3 is formed in a size that allows the friction pads 4 and 4 to be inserted and removed, and each friction pad 4 can be assembled or replaced via the ceiling opening 3j. Done.

  In the friction pad 4 of this embodiment, a female screw hole 4f is formed on the other side surface of the back plate 4b in the disk circumferential direction and on the inner side in the disk radial direction, and the male screw part 10a of the locking member 10 is formed in the female screw hole 4f. Is screwed. The friction pads 4 and 4 are assembled by inserting the friction pad 4 from the ceiling opening 3j between the torque receiving surfaces 3g and 3h of the caliper body 3, and connecting the large-diameter flange portion 10c of the locking member 10 to the center. The friction pad 4 is held by the piston 6 by being arranged and engaged with the piston bottom side of the inner portion in the disk radial direction of the claw portion 6b formed in the piston 6. Further, when replacing the friction pad 4, the hanger pin 11 is removed, and the friction pad 4 is shifted outward in the radial direction of the disk, whereby the engagement between the locking member 10 and the claw portion 6b can be released. 4 can be easily removed and replacement work can be easily performed.

  Note that the present invention is not limited to the 6-pot piston-facing vehicle disc brake as in the above-described embodiments, and can be applied to any piston-facing vehicle disc brake. Further, in the case of a multi-pot piston-facing disc brake, not only the center piston and the friction plate back plate are engaged as in the above-described embodiment, but the claw portion is formed on the other piston. The engaging members provided on the back plate may be engaged with each other, or claw portions may be formed on the plurality of pistons to be engaged with the engaging members provided on the back plate, respectively. Furthermore, the present invention can also be applied to a pin slide type vehicle disc brake. Further, the head portion of the locking member is not limited to a hexagonal shape, and may be a polygonal shape such as a quadrangular shape or an octagonal shape. Further, the head portion is formed in a cylindrical shape, and a plus groove or a negative shape is formed on the outer surface. What provided the groove | channel or what formed the polygonal recessed part in the outer peripheral inner peripheral side may be used. Further, the claw portion provided on the opening surface of the tip of the piston is not limited to being formed in a ring shape around the entire circumference of the piston, and may be formed intermittently by providing notches so as to reduce the weight.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle disc brake, 2 ... Disc rotor, 3 ... Caliper body, 3a ... Action part, 3b ... Bridge part, 3c, 3d, 3e ... Cylinder hole, 3f ... Ceiling opening part, 3g, 3h ... Torque receiving surface, 3i ... Hanger pin mounting hole, 3j ... Ceiling opening, 4 ... Friction pad, 4a ... Lining, 4b ... Back plate, 4c ... Hanging piece, 4d ... Female screw hole, 4e ... Hanger pin insertion hole, 4f ... Female screw hole, 5, 6, 7 ... piston, 6a ... tip opening surface, 6b ... claw part, 8 ... piston seal, 9 ... hydraulic chamber, 10 ... locking member, 10a ... male screw part, 10b ... shaft part, 10c ... large diameter Flange, 10d ... through hole, 10e ... head, 11 ... hanger pin

Claims (2)

A disk axial hanger pin erected on the caliper body on the outer peripheral side of the disk rotor, a pair of friction pads suspended from the hanger pin and arranged to face each other across the disk rotor, and at least one of the friction pads In a vehicle disc brake including a bottomed cylindrical piston that presses against a side surface of a disc rotor,
A claw part is formed in a ring shape on the inner periphery of the tip of the piston,
A locking member is provided on the back plate of the friction pad to engage with the claw portion and restrict the movement of the friction pad in the axial direction of the piston ,
The locking member includes a shaft portion having a male screw portion screwed to a female screw portion formed on the friction pad non-stick surface of the back plate, and a large diameter formed at the piston bottom side tip of the shaft portion. With a flange portion,
The large-diameter flange portion is formed with a smaller diameter than the inner diameter of the claw portion,
In the assembly position where the friction pad is assembled to the caliper body and hung on the hanger pin, the large-diameter flange portion inserted on the piston bottom side of the claw portion when the friction pad is assembled is the outer side in the disk radial direction. Or, it moves inward and the large-diameter flange and the claw portion are in an engaged state,
By removing the hanger pin from the caliper body and shifting the friction pad from the assembly position, the large-diameter flange portion engaged with the claw portion moves inward or outward in the radial direction of the disk, and the large-diameter flange A vehicle disc brake characterized in that the engagement state between the claw portion and the claw portion can be released. The caliper body is a piston-facing type in which a pair of action portions each provided with the piston are arranged to face each other with a disc rotor interposed therebetween, and between the torque receiving portion on the disc rotor turn-in side and the turn-out side of the caliper body. , claim 1 Symbol mounting disc brake for a vehicle, wherein the an opposed piston type which is disposed the friction pad pair across the disk rotor.

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