JP2008256131A - Shim for disk brake pads - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shim capable of preventing the squeal of a disc brake effectively by absorbing effectively the oscillation of the disk rotor etc. which may occur during braking. <P>SOLUTION: The shim 1 for a disc brake pad is interposed between the pad and the pressing member to press the pad toward the disk rotor and has a body plate part 2 and a sucker 3b, 4b consisting of a spring material prepared in both faces of the body plate part 2 integrally and constitutes so that the sucker 3b, 4b sucks to the pad and a pressing member. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a disc brake pad shim interposed between a pad and a pressing member that presses the pad toward a disc rotor.

The shim is interposed between a pad and a pressing member (piston or the like), and is used as a member for preventing disc brake noise (see Patent Document 1). Conventional shims are generally made of stainless steel, and are used when two sheets are stacked, or when two sheets are stacked and a slit for holding grease is formed on one of them. . It is known that these shims can mitigate brake noise. However, the mechanisms and effects are not clear due to the variety. For example, the effect of moving the pad quickly to a stable position or posture by the shim during braking, or the effect of the vibration of the disk rotor or the like that may occur during braking being absorbed by the shim are considered. However, the effect of absorbing the vibration of the disk rotor or the like cannot be sufficiently obtained with the conventional shim.
JP-A-6-129451

  Therefore, an object of the present invention is to provide a shim that can effectively prevent the squeal of a disc brake by effectively absorbing the vibration of a disc rotor or the like that may occur during braking.

  In order to solve the above-mentioned problems, the present invention is a disc brake pad shim having a structure as described in each claim. That is, according to the invention of claim 1, the shim integrally includes a plate-like main body plate portion and a suction cup made of an elastic material provided on both surfaces of the main body plate portion, and the suction cup is adsorbed to the pad and the pressing member. It is configured to do. Therefore, the shim is adsorbed to both the pad and the pressing member. For this reason, when the distance between the pad and the pressing member changes in the narrowing direction, the suction cup elastically deforms in the compression direction, and when it changes in the widening direction, the suction cup elastically deforms in the pulling direction due to the suction effect of the suction cup. . Therefore, the suction cup is elastically deformed in both the compression direction and the pulling direction. Therefore, the vibration in the surface thickness direction of the disk rotor or the like can be attenuated by the suction cup not only in the compression direction but also in the pulling direction. Thus, disc brake noise can be effectively prevented.

  According to invention of Claim 2, the suction cup has a recessed part and the surrounding wall part surrounding a recessed part. Then, the recess is filled with grease. Therefore, the airtightness in the recess of the suction cup is increased by the grease, and the suction force of the suction cup is improved. Therefore, the vibration damping effect in the pulling direction by the suction cup is improved. Further, the grease flows in the suction cup when the suction cup is elastically deformed. Therefore, vibration can be attenuated also by the squeeze effect of grease. Further, since the grease is filled in the recess of the suction cup, it can be stably held in the suction cup.

  According to invention of Claim 3, the suction cup has a recessed part and the surrounding wall part surrounding a recessed part. The recess is not filled with grease. Accordingly, since the recess of the suction cup is not filled with grease, the peripheral wall portion of the suction cup is easily elastically deformed in a direction parallel to the main body plate portion, compared to the case where the recess is filled with grease. For example, it is easily elastically deformed in the rotational direction of the disk rotor. Therefore, the suction cup can effectively attenuate vibrations in the surface direction of the disk rotor or the like. This effectively prevents the disc brake from squeaking during braking.

  According to invention of Claim 4, the suction cup has a recessed part and the surrounding wall part surrounding a recessed part. And the surrounding wall part is formed so large that the diameter of a recessed part is near the front-end | tip of a surrounding wall part. Therefore, the suction cup is easily elastically deformed in the diameter expansion direction. Therefore, the suction cup is surely deformed in the diameter increasing direction, and can thereby be reliably adsorbed to the pad and the pressing member.

(Embodiment 1)
The shim 1 and the disc brake 10 according to the first embodiment will be described with reference to FIGS. As shown in FIGS. 1 and 2, the disc brake 10 includes a mounting 11 fixed to the vehicle body side, a caliper 13 movably attached to the mounting 11, a pair of pads 15, and a pair of shims 1. .

  As shown in FIG. 1, the caliper 13 is attached to the mounting 11 so as to be movable in the rotor axial direction by a pair of slide pins 14. The caliper 13 straddles the disk rotor R in the rotor axial direction from the vehicle body side. A piston (pressing member) 12 is provided on the base end side of the caliper 13, and a pair of claws (pressing member) 13 a is formed at the distal end.

  As shown in FIG. 2, the piston 12 advances toward the disk rotor R by hydraulic pressure, and presses the pad 15 disposed between the piston 12 and the disk rotor R against the disk rotor R. The caliper 13 moves by the pressing reaction force and presses the pad 15 disposed between the claw 13a and the disc rotor R against the disc rotor R by the claw 13a.

  As shown in FIGS. 2 and 3, the pad 15 integrally includes a friction material 16 that slides against the disk rotor R to generate a braking force and a back plate 17 that supports the back surface of the friction material 16. The back plate 17 is made of metal or resin, and recessed portions 17a and 17b are formed on the outer edges and the inner edges of the rotor in the rotor radial direction so that the hooking claws 2a and 2b of the shim 1 are hooked.

  The shim 1 is a member that suppresses the occurrence of brake squeal, and integrally includes a main body plate portion 2 and elastic bodies 3 and 4 attached to both surfaces of the main body plate portion 2 as shown in FIG. Yes. The main body plate portion 2 is a metal plate material such as stainless steel, and has substantially the same shape as the back surface shape of the back plate 17. On the radially outer edge and radially inner edge of the main body plate portion 2, latching claws 2 a and 2 b are formed that project toward the back plate 17 and are latched on the recesses 17 a of the back plate 17.

  The elastic bodies 3 and 4 are made of an elastic material such as rubber, and are attached to the front and back surfaces of the main body plate portion 2 as shown in FIGS. The elastic bodies 3 and 4 have elastic body main bodies 3a and 4a and suction cups 3b and 4b. The elastic body main bodies 3 a and 4 a have a shape that covers almost the entire front surface or back surface of the main body plate portion 2. A plurality of suction cups 3b, 4b are formed at predetermined intervals on the elastic body bodies 3a, 4a.

  The suction cups 3b and 4b have recesses 3b1 and 4b1 and peripheral wall portions 3b2 and 4b2, as shown in FIGS. The peripheral wall portions 3b2 and 4b2 are closed in an annular shape so as to surround the concave portions 3b1 and 4b1. The peripheral wall portions 3b2 and 4b2 protrude from the elastic body bodies 3a and 4a in the thickness direction and taper in the protruding direction. Therefore, the recesses 3b1 and 4b1 are gradually expanded in the radial direction. The diameter of the suction cups 3b and 4b is 0.5 to 8 mm, preferably 1 to 4 mm. If the height of the suction cups 3b and 4b is too high, the brake feeling is deteriorated. If the height is too low, the amount of elastic deformation of the suction cups 3b and 4b becomes too small. Therefore, the heights of the suction cups 3b and 4b are 0.2 to 2 mm, preferably 0.3 to 1 mm.

  The shim 1 is interposed between the pad 15 and the piston 12 and between the pad 15 and the claw 13a as shown in FIG. By being interposed, the suction cup 3 b of the shim 1 faces the piston 12 or the claw 13 a, and the suction cup 4 b faces the pad 15. Therefore, the suction cup 3b is attracted to the piston 12 or the claw 13a, and the suction cup 4b is attracted to the pad 15.

  Grease may or may not be applied to the front and back surfaces of the shim 1 in accordance with the brake squeal mode or the like. When grease is applied, the grease is filled in the recesses 3b1 and 4b1 of the suction cups 3b and 4b. Therefore, the grease is stably held in the recesses 3b1 and 4b1. The grease is preferably a high-viscosity lubricant and has a viscosity that does not ooze out from the recesses 3b1 and 4b1 at room temperature.

  The first embodiment is formed as described above. That is, as shown in FIG. 5, the shim 1 integrally includes a plate-like main body plate portion 2 and suction cups 3b and 4b made of an elastic material provided on both surfaces of the main body plate portion 2, and the suction cups 3b and 4b are pads. 15 and the pressing member (piston 12, claw 13a) (see FIG. 2). Therefore, the shim 1 is adsorbed to both the pad 15 and the pressing member. Therefore, the suction cups 3b and 4b are elastically deformed in the compression direction when the distance between the pad 15 and the pressing member is reduced, and the suction cups 3b and 4b are attracted by the suction effect when changed in the widening direction. 3b and 4b are elastically deformed also in the pulling direction. Therefore, the suction cups 3b and 4b are elastically deformed in both the compression direction and the pulling direction. Therefore, the vibration in the surface thickness direction of the disk rotor R or the like can be damped not only in the compression direction but also in the pulling direction by the suction cups 3b and 4b. Thus, the squeaking of the disc brake 10 can be effectively prevented.

  As shown in FIG. 5, the suction cups 3b and 4b have recesses 3b1 and 4b1, and peripheral wall portions 3b2 and 4b2 surrounding the recesses 3b1 and 4b1. When grease is applied to the shim 1, the recesses 3b1 and 4b1 are filled with grease. Therefore, the airtightness in the recesses 3b1 and 4b1 of the suction cups 3b and 4b is increased by the grease, and the suction force of the suction cups 3b and 4b is improved. Therefore, the vibration damping effect in the pulling direction by the suction cups 3b and 4b is improved. Further, the grease flows in the suction cups when the suction cups 3b and 4b are elastically deformed. Therefore, vibration can be attenuated also by the squeeze effect of grease. Further, since the grease is filled in the recesses 3b1 and 4b1 of the suction cups 3b and 4b, the grease can be stably held in the suction cups 3b and 4b.

  When no grease is applied to the shim 1, the recesses 3b1 and 4b1 are not filled with grease. Accordingly, since the recesses 3b1 and 4b1 of the suction cups 3b and 4b are not filled with grease, the peripheral wall portions 3b2 and 4b2 of the suction cups 3b and 4b are formed of the main body plate portion as compared with the case where the recesses 3b1 and 4b1 are filled with grease. 2 is easily elastically deformed in a direction parallel to 2. For example, it is easily elastically deformed in the rotation direction of the disk rotor R. Therefore, the suction cups 3b and 4b can effectively attenuate the vibration in the surface direction of the disk rotor R or the like. Thereby, the squeal of the disc brake 10 during braking can be effectively prevented.

  The peripheral wall portions 3b2 and 4b2 of the suction cups 3b and 4b are formed larger as the diameters of the recesses 3b1 and 4b1 are closer to the tips 3b3 and 4b3 of the peripheral wall portions 3b2 and 4b2. Therefore, the suction cups 3b and 4b are easily elastically deformed in the diameter increasing direction. Therefore, the suction cups 3b and 4b are reliably deformed in the diameter increasing direction, and can thereby be reliably adsorbed to the pad 15 and the pressing member (piston 12, claw 13a).

  Moreover, since the shim 1 is a single sheet, it has a configuration that is easier to assemble than a form in which a plurality of shims are stacked.

(Embodiment 2)
The second embodiment will be described with reference to FIGS. The second embodiment is formed in substantially the same manner as the first embodiment. However, the second embodiment is different from the first embodiment in that it has elastic bodies 5 and 6 shown in FIGS. 6 and 7 instead of the elastic bodies 3 and 4 shown in FIGS. Hereinafter, the second embodiment will be described focusing on the differences.

  As shown in FIGS. 6 and 7, the shim 1 includes a main body plate portion 2 and elastic bodies 5 and 6 attached to the front and back surfaces of the main body plate portion 2. The elastic bodies 5 and 6 have plate-like elastic body main bodies 5a and 6a and a plurality of suction cups 5b and 6b formed through part of the elastic body main bodies 5a and 6a. The elastic body bodies 5 a and 6 a are formed in substantially the same shape as the front surface or the back surface of the main body plate portion 2. The suction cups 5b and 6b have recesses 5b1 and 6b1 formed by penetrating the elastic body bodies 5a and 6a in a circular hole shape, and peripheral wall portions 5b2 and 6b2 surrounding the recesses 5b1 and 6b1.

(Embodiment 3)
The third embodiment will be described with reference to FIGS. The third embodiment is formed in substantially the same manner as the first embodiment. However, the third embodiment is different from the first embodiment in that it has elastic bodies 7 and 8 shown in FIGS. 8 and 9 instead of the elastic bodies 3 and 4 shown in FIGS. Hereinafter, Embodiment 3 will be described focusing on the differences.

  As shown in FIGS. 8 and 9, the shim 1 includes a main body plate portion 2 and elastic bodies 7 and 8 attached to the front and back surfaces of the main body plate portion 2. The elastic bodies 7 and 8 have plate-like elastic body main bodies 7a and 8a and a plurality of suction cups 7b and 8b formed through the elastic body main bodies 7a and 8a. The elastic body main bodies 7 a and 8 a are affixed to the front surface or the back surface of the main body plate portion 2. The suction cups 7b and 8b have recesses 7b1 and 8b1 formed by penetrating the elastic bodies 7a and 8a in a lattice shape or a mesh shape, and peripheral wall portions 7b2 and 8b2 surrounding the recesses 7b1 and 8b1.

(Other embodiments)
The present invention is not limited to the first to third embodiments, and may be a combination of these or the following forms.
(1) The main body plate portion 2 of the shim 1 according to the first to third embodiments is made of metal. However, it may be made of resin, paper, or formed from the same elastic material as the elastic body.
(2) A plurality of the suction cups 3b to 8b of the shim 1 according to the first to third embodiments are formed over almost the entire surface of the shim 1. However, the form etc. which were multiply formed only in the part etc. corresponding to the piston 12 or the nail | claw 13a may be sufficient.

It is a perspective view of a disc brake. It is the II-II sectional view taken on the line of FIG. It is a perspective view of a pad and a shim. It is a partially expanded perspective view of a shim. FIG. 5 is a cross-sectional view taken along line VV in FIG. 4. FIG. 5 is a partially enlarged perspective view of a shim according to a second embodiment corresponding to FIG. 4. FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 6. FIG. 5 is a partially enlarged perspective view of a shim according to Embodiment 3 corresponding to FIG. 4. It is the IX-IX sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Shim 2 ... Main-body board part 3,4,5,6,7,8 ... Elastic body 3a, 4a, 5a, 6a, 7a, 8a ... Elastic body main body 3b, 4b, 5b , 6b, 7b, 8b ... Suction cups 3b1, 4b1, 5b1, 6b1, 7b1, 8b1 ... Recesses 3b2, 4b2, 5b2, 6b2, 7b2, 8b2 ... Peripheral wall 10 ... Disc brake 12 ...・ Piston (pressing member)
13a ... Claw (pressing member)
15 ... Pad

Claims (4)

A disc brake pad shim (1) interposed between a pad (15) and a pressing member (12, 13a) for pressing the pad (15) toward the disc rotor (R),
A plate-like main body plate portion (2) and suction cups (3b, 4b; 5b, 6b; 7b, 8b) made of an elastic material provided on both surfaces of the main body plate portion (2), A disc brake pad shim (1), wherein (3b, 4b; 5b, 6b; 7b, 8b) is configured to adsorb to the pad (15) and the pressing member (12, 13a). A disc brake pad shim (1) according to claim 1,
The suction cups (3b, 4b; 5b, 6b; 7b, 8b) are peripheral wall portions surrounding the recesses (3b1, 4b1; 5b1, 6b1; 7b1, 8b1) and the recesses (3b1, 4b1; 5b1, 6b1; 7b1, 8b1). (3b2, 4b2; 5b2, 6b2; 7b2, 8b2), and the recesses (3b1, 4b1; 5b1, 6b1; 7b1, 8b1) are filled with grease. ). A disc brake pad shim (1) according to claim 1,
The suction cups (3b, 4b; 5b, 6b; 7b, 8b) are peripheral wall portions surrounding the recesses (3b1, 4b1; 5b1, 6b1; 7b1, 8b1) and the recesses (3b1, 4b1; 5b1, 6b1; 7b1, 8b1). (3b2, 4b2; 5b2, 6b2; 7b2, 8b2), and the recesses (3b1, 4b1; 5b1, 6b1; 7b1, 8b1) are not filled with grease, and the disc brake pad shim (1) . A disc brake pad shim (1) according to claim 1,
The suction cups (3b, 4b) have recesses (3b1, 4b1) and peripheral wall portions (3b2, 4b2) surrounding the recesses (3b1, 4b1), and the peripheral wall portions (3b2, 4b2) The disc brake pad shim (1) is characterized in that the diameter of 4b1) is larger as the diameter is closer to the tip (3b3, 4b3) of the peripheral wall (3b2, 4b2).

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