JP2015161354A - Brake pad for disc brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brake pad for a disc brake comprising a fastening screw part which can withstand a large axial force.SOLUTION: A brake pad 10 for a disc brake is composed of a pressure plate 12 and a friction material 14. The pressure plate 12 comprises a plate main body 16 having at least two penetration holes 16a, and a fastening screw 20a having a screwing length longer than a thickness of the plate main body 16, and also has nuts 18 assembled to the penetration holes 16a. Here, in the penetration hole 16a, it is preferable that an opening part at a friction material pasting face side is made as an opening part at an assembling direction face side of the nut 18, a step part 16b which is larger than the penetration hole 18 in an opening area is arranged at the opening part at the assembling direction face side, and the nut 18 has a flange 22 fit to the step part 16b.

Description

  The present application relates to a brake pad, and more particularly to a brake pad used for a disc brake.

  Conventionally, various proposals have been made for fixing a brake pad to a caliper body in order to prevent the generation of noise due to rattling of the brake pad. For example, in Patent Document 1, in a floating type disc brake, in order to tightly hold the outer brake pad against the inner surface of the claw portion of the caliper body, it is screwed into a spring for holding the brake pad. It is disclosed to adopt a configuration. In Patent Document 2, a female screw hole is formed in a pressure plate constituting a brake pad, a step hole is formed in a claw portion of a caliper body, an elastic bush is disposed in the step hole, and the bush is deformed. Thus, it is disclosed that the brake pad is fastened with a bolt to the claw part.

  Further, as disclosed in Patent Document 3, the point that a female screw hole for fastening is formed in a pressure plate that constitutes a brake pad is also adopted in a brake pad in an opposed disc brake. In Patent Document 3, it is disclosed to fasten with a guide pin for sliding a brake pad in the axial direction of the rotor.

Japanese Utility Model Publication No. 7-42880 Japanese Utility Model Publication No. 7-41080 JP 2012-202528 A Japanese Patent Laid-Open No. 9-257064

  In recent years, it has been proposed to use a pressure plate as a strength member of a caliper body in a floating type disc brake device as the caliper body becomes smaller and lighter by changing the material. When such an action is expected for the brake pad, it is necessary to increase the fastening force between the caliper body and the pressure plate as compared with the conventional case, and to have the integrity with the caliper body.

  However, when such a large fastening force is to be obtained, the axial force applied to the fastening portion increases, and there is a possibility that the screw portion having the thickness of the pressure plate cannot withstand the axial force.

  When it is thought that the length which forms an internal thread will be earned, the structure which provides a boss | hub in the back surface of a pressure plate as disclosed by patent document 4 is considered. However, with a boss formed by general pressing, it is not possible to obtain a height sufficient to form a threaded portion that is resistant to high axial forces, and the wall thickness decreases as the height increases. Therefore, sufficient strength cannot be ensured.

  Therefore, an object of the present invention is to provide a brake pad for a disc brake having a fastening screw portion that can withstand a large axial force.

  In order to achieve the above object, a disc brake brake pad according to the present invention is a disc brake brake pad made of a pressure plate and a friction material, and the pressure plate includes a plate body having at least two through holes, A fastening screw having a screwing length longer than the thickness of the plate body, and a nut assembled to the through hole.

  Further, in the disc brake brake pad having the above-described features, the through hole includes a step portion having an opening area larger than the through hole in the opening on the friction material pasting surface side, and the nut includes the nut A flange that fits into the stepped portion may be provided.

  By setting it as such a structure, it can prevent that the nut assembled | attached to the through-hole falls out to the surface on the opposite side to a friction material sticking surface side.

  Further, in the brake pad for a disc brake having the above-described characteristics, the through hole includes a tapered portion that widens the opening area of the through hole at the opening on the friction material application surface side, and the nut includes the taper. A taper flange that fits into the portion can also be provided.

  Even if it is a case where it is set as such a structure, it can prevent that the nut assembled | attached to the through-hole falls out to the surface on the opposite side to the friction material sticking surface side.

  Further, in the disc brake brake pad having the above-described features, it is preferable that a rotation preventing means is provided between the nut and the through hole.

  By adopting such a configuration, there is no possibility that the nut is rotated by vibration or the like and the fastening state via the fastening screw is loosened.

  Further, in the brake pad for a disc brake having the above-described characteristics, the fastening screw forming portion of the nut is used as a through hole, and the fastening screw is formed in the opening portion that is located on the friction material application surface side. The cap which seals the through-hole of a part can be provided.

  By adopting such a configuration, even if the arrangement position of the nut in the plate body overlaps with the friction material sticking region in a plan view, the friction material is formed in the through hole constituting the fastening screw portion when the friction material is formed. There is no risk of flowing in.

  Moreover, in the brake pad for disc brakes having the above-described features, the fastening screw forming portion of the nut can be bottomed.

  Even in such a configuration, even when the arrangement position of the nut in the plate main body overlaps with the friction material sticking region in a plan view, the friction material is formed in the through hole constituting the fastening screw portion when the friction material is formed. There is no risk of flowing in.

  Further, in the brake pad for a disc brake having the above-described features, a pair of torque receiving portions are provided at ends corresponding to the rotation-in side and the rotation-out side of the rotor in the plate body, and the torque receiving unit is provided. The part may be arranged at a position corresponding to the outer peripheral side of the outer diameter of the rotor.

  When the brake pad is assembled to the disc brake, there is no need to arrange a support, a guide pin or the like that functions as an anchor during braking up to the outer side surface of the rotor. Therefore, the disc brake can be made small and light.

  According to the disc brake brake pad having the above-described characteristics, even if a large axial force acts on the fastening screw, it can withstand this.

It is a perspective view at the time of seeing the brake pad which concerns on embodiment from the assembly | attachment surface side. It is a perspective view at the time of seeing the brake pad concerning an embodiment from the friction material pasting side. It is a disassembled perspective view of the brake pad which concerns on embodiment. It is a perspective view showing an example of a disc brake suitable for assembling a brake pad concerning an embodiment. It is a figure which shows the cross-sectional structure along the virtual line A in FIG. It is a figure for demonstrating the modification of the brake pad which concerns on embodiment, and is a figure which shows the cross-sectional structure of the nut and plate body which formed the screw for fastening in the bottomed hole. It is a figure which shows the form of the pressure plate in the AA arrow in FIG. It is a form of the nut in the BB arrow in FIG. 6, and is a figure which shows the example in the case of assembling | attaching by fitting and press fit. It is a form of the nut in the BB arrow in FIG. 6, and is a figure which shows the example in the case of assembling by caulking. It is sectional drawing which shows the modified example of the nut which made the flange part the taper type, and the plate body which made the step part the taper type. It is a figure which shows the example at the time of removing the arrangement | positioning site | part of a nut from the sticking area | region of a friction material.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a brake pad for a disc brake device according to the present invention will be described in detail with reference to the drawings. First, a basic form of a brake pad according to the present invention will be described with reference to FIGS. 1 is a perspective view when the brake pad according to the embodiment is viewed from the assembly surface side, and FIG. 2 is a perspective view when viewed from the friction material application surface side. FIG. 3 is an exploded perspective view of the brake pad.

  The brake pad 10 according to the present embodiment is configured based on a pressure plate 12 and a friction material 14 in the same manner as a general brake pad. The pressure plate 12 includes a plate body 16 and a nut 18. The plate body 16 is a flat plate made of a material having high rigidity, for example, a steel plate, and has at least two through holes 16a and a torque receiving portion 16d. The through hole 16a is a hole for assembling a nut 18 whose details will be described later. The through hole 16a is provided with a step portion 16b at an opening located on the surface of the plate body 16 on the side where the friction material 14 is applied, and forms a step hole body. It is desirable that the step portion 16b has a configuration capable of preventing rotation of the nut 18 fitted in the through hole 16a by forming a stop groove 16c at least in part. In the plate main body 16 according to the present embodiment, the stepped portion 16b is matched to the outer diameter shape of the flange 22 of the nut 18 described later, so as to have a pair of parallel surfaces, and matched to the position of the parallel surfaces. Thus, a stop groove 16c is formed. Further, by providing a slight step between the parallel surface and the stop groove 16c, the nut 18 can be prevented from rotating only by fitting the nut 18 into the through hole 16a. doing.

  The torque receiving portion 16d is a force transmitting element for transmitting torque during braking to a holding member (for example, a support, a caliper body, a guide pin, etc.). In the case of the brake pad 10 according to the present embodiment, the torque receiving portion 16d is formed so as to be paired with end portions corresponding to a turn-in side and a turn-out side of a rotor (not shown) with the center of the plate body 16 as a base point. ing. In the case of the brake pad 10 according to the present embodiment, the torque receiving portion 16d is disposed at a position corresponding to the outer peripheral side of the outer diameter of the rotor when the brake pad 10 is assembled to the caliper body. Is provided. That is, the torque receiving portion 16d is provided so that at least a part thereof is positioned on the outer peripheral side of the friction material 14 with respect to the radial direction of the rotor.

  The nut 18 is a cylindrical body provided with a fastening screw 20 a (female screw) on the inner peripheral surface, and the length of the cylindrical portion 20 and the screwing length of the fastening screw 20 a are determined by the plate thickness of the plate body 16. It is configured to be longer. In the present embodiment, the fastening screw 20 a is provided in a through hole provided in the cylindrical portion 20. In the case of the brake pad 10 according to the present embodiment, the outer peripheral shape of the nut 18 is circular, and a flange 22 is formed at one end. The diameter of the flange 22 is larger than that of the cylindrical portion 20, and is formed to have a size that can be fitted into the step portion 16 b in the plate body 16. The flange 22 is formed to have a thickness equal to the thickness of the step portion 16 b in the plate body 16. Moreover, the flange 22 is provided with a notch 22a cut out along a string on a part thereof. And on the inner peripheral side of the flange 22, a step portion 22b having a diameter larger than that of the through hole provided with the fastening screw 20a is provided, and a step groove 22c is formed from the step portion 22b toward the notch portion 22a. .

  Further, in the brake pad 10 according to the present embodiment, the cap 24 is disposed on the step portion 22 b of the flange 22 in the nut 18. The cap 24 includes a cap main body 24a that fits into the stepped portion 22b, and a detent piece 24b that extends from the cap main body 24a toward the stepped groove 22c. The anti-rotation piece 24b is formed to be longer than the length of the step groove 22c.

  In the pressure plate 10 including such elements, a nut 18 is inserted into the through hole 16a of the plate body 16 from the sticking surface side (one surface side) of the friction material 14 forming the step portion 16b. Thus, the cylindrical portion 20 of the nut 18 protrudes on the other surface side. At this time, the length of the cylindrical portion 20 protruding to the other surface side of the plate body 16 is preferably configured to be longer than the outer diameter of the fastening screw 20a. By adopting such a configuration, it becomes possible to sufficiently secure the fitting length with the claw portion of the caliper body, the details of which will be described later, and the screwing length with the bolt, and the resistance to the axial force caused by the fastening is sufficient. It is because it will be able to be secured.

  Further, by inserting the cylindrical portion 20 of the nut 18 from one surface side of the plate body 16, the flange 22 can be inserted into the step portion 16b, and the nut 18 can be prevented from falling off to the other surface side. . At this time, the nut 18 can be prevented from rotating with respect to the through hole 16a by matching the notch 22a of the flange 22 with the parallel surface of the plate body 16. Further, by fitting the cap 24 into the step portion 22b of the flange 22 in such an assembled state, the anti-rotation piece 24b of the cap 24 is fitted over both the step groove 22c and the stop groove 16c. This action can enhance the anti-rotation action of the nut 18 as well as the anti-rotation of the cap 24.

  The friction material 14 is attached to a predetermined area of the plate body 16. More specifically, the friction material 14 is prepared by mixing a thermosetting resin and a friction material in accordance with a predetermined blending composition, forming a predetermined shape on one surface of the pressure plate 12, and then sintering. It consists of For this reason, the cap 24 is disposed in the opening of the nut 18, that is, the formation portion of the fastening screw 20 a to seal the through hole, thereby preventing the friction material 14 before sintering from flowing into the nut 18. Can do. By preventing the friction material 14 from flowing into the nut 18, it is possible to prevent the female screw of the fastening screw 20 a from being buried in the friction material 14, and also prevent the composition of the friction material 14 from becoming coarse and dense. be able to.

  Next, an example of a disc brake suitable for assembling the brake pad having the above characteristics will be described with reference to FIGS. 4 and 5. FIG. 4 is a perspective view when the disc brake is viewed from the outer side, and FIG. 5 is a view showing a cross section taken along the imaginary line A in FIG.

  The disc brake 100 shown in FIGS. 4 and 5 is configured based on a caliper body 102, a support 124, an inner brake pad 138, an outer brake pad, and a rotor (not shown). In addition, the brake pad 10 mentioned above will hit an outer side brake pad. Therefore, in the following description, the outer side brake pad is simply referred to as the brake pad 10.

  The caliper body 102 includes a cylinder portion 104, a claw portion 112, a center bridge 118, and a side bridge 120. The cylinder part 104 is a drive source of the disc brake 10 according to the present embodiment, and includes a piston 106 and a cylinder 108 for accommodating and projecting the piston 106. Further, the cylinder part 104 is provided with a guide pin assembly part 110 for assembling a guide pin 136 to be described in detail later. The guide pin assembly portion 110 is provided so as to be located outside the outer periphery of the rotor. This is because the assembled guide pin 136 is positioned outside the outer periphery of the rotor to avoid interference between the rotor and the guide pin 136.

  The claw portion 112 is a reaction force receiver for the pressing force generated by the piston 106. The claw portion 112 is provided with a notch portion 114 (inner peripheral side notch portion) at a position facing the cylinder forming position in the cylinder portion 104. This is because the inner peripheral machining of the cylinder 108 in the cylinder part 104 is performed using the notch part 114. Each block (two blocks in the example shown in the present embodiment) constituting the claw portion 112 is formed with a through hole 112a through which the bolt 116 is inserted. The through hole 112a is a step hole.

  The cylinder portion 104 and the claw portion 112 are connected by a center bridge 118 and a side bridge 120 that straddle the outer side of the outer periphery of the rotor. In the disc brake 100 according to the embodiment, a through hole 118 a is provided in the center of the center bridge 118. By providing the through hole 118a, it is possible to easily check the reduction degree of the friction materials 142 and 14 in the inner side brake pad 138 and the brake pad 10 (outer side brake pad), and to reduce the heat generated during braking. It can also contribute to heat dissipation. The side bridge 120 is provided at a position corresponding to the turning-in side and the turning-out side of the rotor with the center bridge 118 as a base point. By providing the side bridge 120, the caliper body 102 has a structure having a frame-shaped frame in plan view. For this reason, the rigidity of the caliper body 102 can be increased.

  Therefore, even when the caliper body 102 is made of aluminum that is softer than cast iron (including alloys composed mainly of aluminum), the thickness of the center bridge 118 (so-called back wall) is reduced while braking. The opening between the cylinder portion 104 and the claw portion 112 and the distortion (tilt) in the rotor rotation direction can be suppressed. By reducing the thickness of the center bridge 118 and the side bridge 120, the caliper body 102 can be disposed in the gap even when the gap between the wheel inner wall of the wheel and the outer periphery of the rotor is narrow. Become.

  When the caliper body 102 does not fit between the wheel inner wall and the outer periphery of the rotor, it is necessary to take measures such as wheel inch up and rotor size down. In such a case, for example, when the wheel is increased in inches, it is necessary to reduce the flatness of the tire, which may cause a deterioration in ride comfort and an increase in cost due to the mounting of a large-diameter wheel. Further, when the size of the rotor is reduced, it is necessary to secure a wide pressing surface when the piston diameter is increased and the same hydraulic pressure is applied to the rotor. This is because when a high pressing force is applied to the rotor by increasing the hydraulic pressure, the spread between the cylinder portion 104 and the claw portion 112 that occurs during braking increases. In addition, when a large-diameter piston is employed, there are concerns that problems such as an increase in weight and deterioration of the touch feeling of the pedal during a brake operation may occur.

  In addition, by configuring the caliper body 102 with a lightweight member such as aluminum as described above, the overall weight of the disc brake 100 can be reduced, which can contribute to an improvement in the motion performance of the vehicle.

  Between the center bridge 118 and the side bridge 120, a notch 122 (outer peripheral notch) formed so as to be hooked on the claw 112 is provided. The notch portion 122 is provided at a position corresponding to the guide pin assembly portion 110 in the cylinder portion 104. This is to avoid interference between the sleeve 134 provided in the guide pin guide portion 132 in the support 124 for sliding the guide pin 136 and the caliper body 102.

  Moreover, the notch part 122a in the nail | claw part 112 side is provided in the site | part which hits the outer side rather than the outer periphery of a rotor. When the notch portion 122a is expanded to the inside of the outer periphery of the rotor in the claw portion 112, the component portion of the claw portion 112 connected to the side bridge 120 and the component portion of the claw portion 112 connected to the center bridge 118 A connection part becomes small and the bending in the said connection part arises. For this reason, the effect of suppressing the bending of the center bridge 118 due to the rigidity of the side bridge 120 is reduced, and in order to suppress the opening and twisting of the caliper body 102, it is necessary to take a means of increasing the thickness of the center bridge 118. Will occur. On the other hand, by suppressing the range of the notch 122a to a minimum range such as a portion outside the outer periphery of the rotor, it is possible to increase the rigidity of the caliper body 102 as a whole and to distribute the force related to twisting and opening. Can be achieved.

  The support 124 is fixed to the vehicle body and plays a role of slidably supporting the caliper body 102. 4 and 5, the support 124 is disposed between the cylinder portion 104 and the claw portion 112 in the caliper body 102, that is, in a frame-like frame constituted by the caliper body 102.

  The support 124 is provided with at least an anchor 126, a bridge 128, a mounting hole 130, and a guide pin guide part 132. The anchors 126 are arranged on each of the rotor entrance side and the exit side. In this embodiment, while supporting the inner brake pad 138, the inner brake pad 138 plays a role as a torque receiving portion that receives a force to be used for rotation of the rotor during braking.

  The bridge 128 is a connecting member that connects the anchor 126 disposed on the rotor entrance side and the anchor 126 disposed on the exit side. The mounting hole 130 is provided at a connection portion between each anchor 126 and the bridge 128, and is a hole for fastening the support 124 via a bolt (not shown) to a mounting hole (not shown) provided in the vehicle. is there.

  The guide pin guide portion 132 is a tip of the anchor 126 that forms a pair, and is a through hole provided at a position outside the outer periphery of the rotor in the assembled state. In the form shown in FIGS. 4 and 5, a sleeve 134 formed in a bag shape is arranged in the guide pin guide portion 132, and the guide pin 136 is slid in the sleeve 134.

  The guide pin 136 is a rod-like member that is assembled to the guide pin assembly portion 110 of the cylinder portion 104 in the caliper body 102 described above. Regarding the assembly, the base end of the guide pin 136 is disposed on the cylinder portion 104 and the distal end is disposed on the claw portion 112 side. Here, the length of the guide pin 136 may be such a length as to reach the rotor facing surface of the claw portion 112 in the assembled state.

  In the disc brake 100 of the present embodiment, the guide pin guide portion 132, the sleeve 134, and the guide pin 136 are disposed so as to be positioned (122a) in the notch portion 122 formed in the caliper body 102 in the assembled state. . By adopting such a configuration, it is possible to prevent the guide pin guide portion 132, the sleeve 134, and the guide pin 136 that are to be disposed outside the outer periphery of the rotor from interfering with the caliper body 102. The guide pin guide part 132, the sleeve 134, and the guide pin 136 are all inside the arc formed by connecting the center bridge 118 and the two side bridges 120 in the caliper body 102, that is, the thickness of the back meat part. It is arranged and configured so as to be within the range. By adopting such a configuration, the guide pin guide portion 132 and the like do not interfere with the wheel or the like as long as the caliper body 102 can be accommodated.

  The inner brake pad 138 is a brake pad that is disposed on the inner side of the rotor (not shown), that is, on the cylinder portion 104 side and is directly pressed by the piston 106 provided on the cylinder portion 104. The inner brake pad 138 includes a friction material 142 that contacts the sliding surface of the rotor, and a pressure plate 140 that is a steel plate to which the friction material 142 is attached. The inner brake pad 138 is held by the anchor 126 of the support 124 and slides in the axial direction of the rotor.

  The brake pad 10 assembled as the outer brake pad is disposed on the outer side of the rotor (not shown), that is, on the surface facing the rotor in the claw portion 112. The brake pad 10 is assembled by inserting the cylindrical portion 20 of the nut 18 protruding from the other surface of the pressure plate 12 into a through hole 112 a formed in the claw portion 112 of the caliper body 102. And the nail | claw part 112 and the brake pad 10 are fastened by screwing the volt | bolt 116 with the screw 20a for fastening of the cylindrical part 20 inserted in the through-hole 112a.

  The brake pad 10 that is firmly fastened to the claw portion 112 by tightening functions as a strength member of the caliper body 102. The fastening screw 20 a provided on the nut 18 has a sufficient screwing length in relation to the bolt 116. For this reason, it has sufficient tolerance with respect to the axial force by a firm fastening, and also has high tolerance with respect to the damage of the screw part by the vibration etc. at the time of braking.

  Although not shown, the rotor is generally a rotating plate disposed between the inner side brake pad 140 and the brake pad 10 as the outer side brake pad, and slides to the position where the friction materials 142 and 14 face each brake pad. Has a surface. The rotor is fixed so as to rotate with a wheel (not shown).

  Since the brake pad 10 according to the above embodiment is configured to be assembled to the caliper body 102 having the above-described configuration, the torque receiving portion 16d is provided on the outer peripheral side of the rotor. However, in the case of a brake pad that is assembled to a disc brake configured to receive a braking torque by a part of the support or a part of the caliper body, there is no need to limit the arrangement position of the torque receiving part. The example shown in FIGS. 4 and 5 is an example of assembly to a floating caliper. However, the brake pad 10 according to the present invention is disclosed in Patent Document 3, as shown in Patent Document 3. It is also possible to assemble to.

Next, a modification applicable to the disc brake pad of the present invention will be described.
In the brake pad 10 according to the above-described embodiment, a through hole is formed in the nut 18, and the fastening screw 20a is formed in the through hole. For this reason, it has been described that a cap 24 for preventing the inflow of the friction material 14 when the friction material 14 is formed is disposed in the opening on the flange side of the through hole.

  On the other hand, as shown in FIG. 6, the nut 18A according to the present modification has a configuration in which a fastening screw 20a is formed in a bag hole having a bottom on the flange 22 side. With such a configuration, a cap for sealing the opening is not necessary, and the number of components can be reduced.

  When the nut 18A has such a configuration, a stop groove 16c (see FIG. 3) for fitting the cap 24 is not required in the step portion 16b of the through hole 16a as shown in FIG. It becomes. This is because if the parallel surface is formed on the outer periphery of the step portion 16b and the flange 22 of the nut 18A is fitted, the nut 18A can be prevented from rotating.

  In addition, when assembling the nut 18A (including the nut 18) to the pressure plate 12, a method such as press fitting or caulking can be employed in addition to fitting. In the case of adopting fitting or press-fitting with respect to the assembling method, the outer shape in plan view of the cylindrical portion 20 and the flange 22 is penetrated as shown in FIG. It is good to make it equal to the planar view shape of the hole 16a and the step part 16b. Here, in the case of fitting, the fitting intersection of the cylindrical portion 20 and the flange 22 with respect to the through hole 16a and the step portion 16b is set to be negative. On the other hand, in the case of press-fitting, the fitting intersection of both is positive.

  Further, when the nut 18A (including the nut 18) is assembled to the pressure plate 12 by caulking, the planar view shape of the flange 22 of the nut 18A is circular as shown in FIG. By inserting into the cylindrical part 20 through-hole 16a of the nut 18A of such a form and press-fitting the flange 22 into the step part 16b, the site | part located in the flange 22 and the outer side of the parallel surface of the step part 16b (FIG. 9). The outer peripheral side of the part indicated by the broken line in the flange 22 of the flange 22 is plastically deformed. A part of the flange 22 is plastically deformed according to the shape of the step portion 16b, so that the nut 18A is prevented from rotating.

  Moreover, in the said embodiment and modification, it has shown so that it may be a disk shaped flat plate about the flange 22 which comprises the nuts 18 and 18A. However, the flange 22 functions as a retainer for preventing the nuts 18 and 18 from falling off to the other surface. Therefore, you may make it provide the taper flange 22B which made the flange the taper shape like the nut 18B shown in FIG. When the flange is tapered, the step provided in the through hole 16a is also adapted to the shape of the flange as the tapered portion 16e. Even with the nut 18B and the through hole 16a having such a configuration, the nut 18B can be prevented from coming off in the assembled state.

  Further, in the above-described embodiment and the modification, in each of the nuts 18, 18 </ b> A, 18 </ b> B, a cap 24 is disposed at the end where the flange 22 or the taper flange 22 </ b> B is formed, or a hole for forming the fastening screw 20 a It was described that the opening was closed by having a bottom. However, the reason for closing the opening of the hole forming the fastening screw 20a is to prevent the friction material from flowing into the hole. Therefore, as shown in FIG. 11, when the nuts 18, 18 </ b> A, 18 </ b> B are arranged outside the region where the friction material 14 is pasted in the plate body 16, the fastening screw 20 a is formed by the cap 24 or the like. There is no need to close the hole (through hole).

  Moreover, in the said embodiment, since the case where the nail | claw part 112 in the caliper body 102 was made into 2 blocks was mentioned as an example, the structure which provides the nut 18 (18A and 18B are included) in the location (2 locations) corresponding to each block. However, when the number of divided blocks of the claw portion is increased, the number of nuts 18 provided on the plate body 16 can be designed to be increased.

10 ......... Brake pad, 12 ......... Pressure plate, 14 ......... Friction material, 16 ......... Plate body, 16a ......... Through hole, 16b ......... Step, 16c ......... Stop groove, 16d ......... Torque receiving part, 16e ......... Tapered part, 18, 18A, 18B ......... Nut, 20 ......... Cylindrical part, 20a ......... Fastening screw, 22 ......... Flange, 22a ......... Notch portion, 22b ......... Step portion, 22c ......... Step groove, 22B ......... Taper flange, 24 ......... Cap, 24a ......... Cap body, 24b ......... Rotation stop piece, 100 ......... Disc brake, 102 ......... Caliper body, 104 ......... Cylinder, 106 ......... Piston, 108 ......... Cylinder, 110 ......... Guide pin assembly, 112 ......... Claw, 112a ......... Through hole, 114 ……… Notch, 116 ... Bolt, 118 ... Center bridge, 118a ... Through hole, 120 ... Side bridge, 122 ... Notch, 122a ... Notch, 124 ... Support, 126 ......... Anchor, 128 ......... Bridge, 130 ......... Mounting hole, 132 ......... Guide pin guide, 134 ......... Sleeve, 136 ......... Guide pin, 138 ......... Inner brake Pad, 140 ......... Pressure plate, 142 ......... Friction material.

Claims (7)

A brake pad for a disc brake composed of a pressure plate and a friction material,
The pressure plate includes a plate body having at least two through holes;
A brake pad for a disc brake, comprising: a fastening screw having a screwing length longer than a thickness of the plate body; and a nut assembled to the through hole. The through hole includes a step portion having an opening area larger than the through hole at the opening on the friction material sticking surface side.
The brake pad for a disc brake according to claim 1, wherein the nut includes a flange that fits into the stepped portion. The through hole is provided with a tapered portion that widens the opening area of the through hole in the opening on the friction material pasting surface side,
The brake pad for a disc brake according to claim 1, wherein the nut includes a tapered flange that fits into the tapered portion.   The brake pad for a disc brake according to any one of claims 1 to 3, wherein a detent means is provided between the nut and the through hole.   A fastening screw forming portion of the nut is used as a through hole, and a cap for sealing the through hole of the fastening screw forming portion is provided in an opening which is located on the friction material pasting surface side. The brake pad for a disc brake device according to any one of claims 1 to 4.   The disc brake brake pad according to any one of claims 1 to 4, wherein the fastening screw forming portion of the nut has a bottom. A pair of torque receiving portions is provided at the end corresponding to the turn-in side and the turn-out side of the rotor in the plate body,
The disc brake brake pad according to any one of claims 1 to 6, wherein the torque receiving portion is disposed at a position corresponding to the outer peripheral side of the outer diameter of the rotor.