JP2008057788A - Disc brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disc brake capable of restraining an increase in the number of part items, an enlargement and deformation by braking torque, while securing a width in the disc rotational direction of a brake pad so as to secure sufficient braking performance. <P>SOLUTION: A radial mount type is formed by fixing a caliper 13 to a non-rotable part of a car body by inserting an installation bolt into two bolt installation holes 34a and 34b separately arranged in the disc rotational direction by extending in the disc radial direction. In the caliper, a communicating passage 36 is arranged between the bolt installation hole 34b and the brake pad 17 only on one side in the disc rotational direction, and a central position C2 in the disc rotational direction of the brake pad 17, is arranged to be offset to the other side in the disc rotational direction, to a central position C1 of the mutual bolt installation holes 34a and 34b separating in the disc rotational direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a disc brake used for braking a vehicle, and more particularly to a radial mount type disc brake that supports a caliper on a vehicle body side with a mounting bolt extending along a disc radial direction.

  As shown in FIG. 6, the disc brake is disposed on both sides of the disc 101 in the axial direction (vertical direction in FIG. 6) in a state where the disc 101 is aligned with the disc rotation direction (left-right direction in FIG. 6). A pair of brake pads 102 and a cylinder hole 103a disposed on both sides in the disk axial direction in a state of being aligned with each other in the disk rotating direction and two pairs being spaced apart in the disk rotating direction , 103b, and a caliper 105 that slidably fits pistons 104a, 104b that press the brake pad 102 into the cylinder holes 103a, 103b, and a support member (not shown) that supports the caliper 105 on the vehicle body side. There is something.

  In this disc brake, mounting bolts (not shown) are attached to two bolt mounting holes 107a and 107b in which the calipers 105 are arranged in parallel to each other in the radial direction of the disc and spaced apart in the disc rotating direction. It is of a radial mount type that is fixed to the support member by

  The cylinder holes 103a and 103b on the disc rotation direction outlet side of the caliper 105 communicate with each other between the bolt mounting hole 107b on the disc rotation direction outlet side and the brake pad 102 for the flow of brake fluid. Further, the cylinder holes 103b adjacent in the disk rotation direction are also communicated with each other through the intermediate communication path 109.

Such a conventional radial mount type disc brake has a center position between the bolt mounting holes 107a and 107b in the disc rotation direction, a center position of the brake pad 102 in the disc rotation direction, and a piston 104a in the disc rotation direction. The central positions of 104b are made to coincide with each other as indicated by reference numeral C11.
JP 2000-249173 A

  As described above, the caliper 105 of the radial mount type disc brake needs to be formed with bolt mounting holes 107a and 107b along the radial direction of the disc, and is connected to a position where it does not interfere with the bolt mounting hole 107b on the outlet side in the disc rotation direction. It is necessary to provide a space 110 for disposing the brake pad 102 at a position where the passage 108 is formed and does not interfere with the communication passage 108. For this reason, as shown in FIG. 6, the bolt mounting holes 107a and 107b spaced apart in the disk rotation direction without increasing the distance L11 between the bolt mounting holes 107a and 107b and the disk 101 so as to reduce the size of the caliper 105. If the distance L12 is narrowed, the width L13 of the brake pad 102 in the disc rotation direction becomes narrow, and there is a possibility that sufficient braking performance cannot be ensured.

  On the other hand, as shown in FIG. 7, the width L13 of the brake pad 102 in the disc rotation direction is increased so as to ensure sufficient braking performance without increasing the distance L11 between the bolt mounting holes 107a and 107b and the disc 101. Then, the space 110 for disposing the brake pad 102 is also widened in the disk rotation direction. When the communication path 108 and the bolt mounting hole 107b are formed while avoiding interference, the bolt mounting holes 107 and 107b are moved in the disk rotating direction. As a result, the distance L12 between the bolt mounting holes 107a and 107b is widened, and the caliper 105 is enlarged.

  Further, as shown in FIG. 8, in order to suppress the enlargement of the caliper 105 while increasing the width L13 of the brake pad 102 in the disk rotation direction so as to ensure sufficient braking performance, the bolts spaced apart in the disk rotation direction are used. If the increase in the distance L12 between the mounting holes 107a and 107b is suppressed, the distance L11 between the bolt mounting holes 107a and 107b and the disk 101 increases, and as a result, the distance between the disk 101 and the bolt mounting holes 107a and 107b increases. The caliper 105 is greatly deformed by the braking torque.

  In addition, as shown in Patent Document 1, it is possible to adopt a structure in which a connection pipe that forms a communication path is attached to the outside of the caliper. However, in this case, of course, the number of parts increases and the cost increases. End up.

  Accordingly, an object of the present invention is to provide a disc brake capable of suppressing an increase in the number of parts, an increase in size, and deformation due to a braking torque while ensuring a width of the brake pad in the disc rotating direction so as to ensure sufficient braking performance. Is to provide.

  In order to achieve the above object, a disc brake according to claim 1 of the present invention includes a pair of brake pads disposed opposite to both sides of the disc, and a disc rotation to press the brake pad toward the disc. A plurality of pistons spaced apart from each other in a direction, and a caliper in which a cylinder hole into which the piston is slidably fitted is formed so as to face the disc, and the caliper extends in the disc radial direction. In a radial mount type disc brake having two bolt mounting holes that are spaced apart from each other in the disk rotation direction and fixed to a non-rotating portion of the vehicle body by inserting the mounting bolt into the bolt mounting hole. The caliper has a communication path for communicating the cylinder holes facing each other only on one side in the disk rotation direction. A line segment that is disposed between the bolt mounting hole and the brake pad and that connects a center of pressing of the plurality of pistons to the brake pad with respect to a central position of the bolt mounting holes in the disk rotation direction. And the center position of the brake pad in the disk rotation direction is offset from the other position in the disk rotation direction with respect to the center position of the bolt mounting holes. It is characterized by being.

  Thus, in the disk rotation direction, the center positions of the line segments connecting the centers of pressing of the pistons to the brake pads of the plurality of pistons that are spaced apart from each other in the disk rotation direction with respect to the center positions of the bolt mounting holes are the same. Since the center position of the brake pad in the disk rotation direction is offset with respect to the other side in the disk rotation direction with respect to the center position of the bolt mounting holes, the brake pad Even if the width in the disk rotation direction is secured, a connecting pipe that forms a communication path is attached to the outside of the caliper, the interval between the bolt mounting holes that are separated in the disk rotation direction is increased, or the bolt mounting hole and the disk are Without increasing the distance, increase the distance between the bolt mounting hole on one side and the brake pad in the disc rotation direction. , It can be disposed the communication passage so as not to interfere with them during this time.

  According to a second aspect of the present invention, there is provided a disc brake comprising: a brake pad disposed opposite to both sides of the disc to form a pair; and a plurality of pairs spaced apart in the disc rotation direction; and the brake pad A plurality of pairs of pistons each pressing toward the disk; and a caliper in which cylinder holes into which the pistons are slidably fitted are opposed to each other across the disk. A radial mount type disc that is provided with two bolt mounting holes that are spaced apart in the disc rotation direction and that is fixed to a non-rotating portion of the vehicle body by inserting the mounting bolts into the bolt mounting holes. In the brake, inside the caliper, there is a communication path that communicates the cylinder holes facing each other in the disc rotation direction. Only between the bolt mounting hole and the brake pad, and in the disk rotation direction, the center of the bolt mounting holes is connected to the center of pressing of the plurality of pairs of pistons to the brake pad. The central positions of the line segments are arranged to coincide with each other, and the central positions of the plurality of pairs of brake pads in the disk rotation direction are offset to the other side in the disk rotation direction with respect to the central positions of the bolt mounting holes. It is characterized by being arranged.

As described above, in the disk rotation direction, the center position of the line segment connecting the centers of pressing the brake pads of the plurality of pairs of pistons with the center position of the bolt mounting holes is disposed. The center positions of the plurality of pairs of brake pads in the disk rotation direction are offset from the center position of the bolt mounting holes in the disk rotation direction. Even if the width is secured, it is possible to attach a connecting pipe that forms a communication path outside the caliper, widen the distance between the bolt mounting holes that are separated in the disk rotation direction, or increase the distance between the bolt mounting hole and the disk. Without any gap between the bolt mounting hole on one side in the disc rotation direction and the brake pad on one side in the disc rotation direction. Gaité, can be disposed the communication passage so as not to interfere with them during this time.
The disc brake according to claim 3 of the present invention is the disc brake according to claim 1 or 2, wherein the pistons are paired to face both sides of the disc and are spaced apart in the disc rotation direction. In the disk rotation direction, the center position of the line segment connecting the centers of pressing of the two pairs of pistons to the brake pad is arranged to coincide with the center position of the bolt mounting holes.

  According to the disc brake of the first aspect of the present invention, in the disc rotation direction, the center of the pressure against the brake pad of the plurality of pistons that are provided apart from each other in the disc rotation direction with respect to the center position of the bolt mounting holes. The center position of the brake pad in the disk rotation direction is offset to the other side in the disk rotation direction with respect to the center position of the bolt mounting holes. Therefore, even if the width of the brake pad in the disc rotation direction is secured, the connection pipe that forms the communication path is attached to the outside of the caliper, and the distance between the bolt mounting holes that are separated in the disc rotation direction is set. Bolts on one side in the disk rotation direction without expanding or increasing the distance between the bolt mounting hole and the disk And the spacing with the Tsukeana a brake pad, it is possible to dispose the communication passage so as not to interfere with them during this time.

  According to the disc brake of claim 2 of the present invention, in the disc rotation direction, the center position of the line segment connecting the center of pressing between the plurality of pairs of pistons to the brake pad with respect to the center position of the bolt mounting holes. And the center positions of the plurality of pairs of brake pads in the disk rotation direction are offset from the center position of the bolt mounting holes to the other side in the disk rotation direction. Therefore, even if the width of the brake pad in the disk rotation direction is secured, a connecting pipe that forms a communication path is installed outside the caliper, the distance between the bolt mounting holes that are separated in the disk rotation direction is increased, and bolt mounting Without increasing the distance between the hole and the disk, the bolt mounting hole on one side in the disk rotation direction and the disk rotation direction Kicking to expand the distance between one side of the brake pad may be provided with a communication passage so as not to interfere with them during this time.

  A disc brake according to a first embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In the following description, the description will be made with the disc brake attached to the set position on the vehicle body side.

  The disc brake 10 according to the first embodiment includes a disc 11 that rotates integrally with a vehicle wheel, a support member 12 that is attached to the vehicle body so as to be adjacent to the disc 11 in the axial direction, and a disc. 11 and a caliper 13 fixed to the support member 12 in a state of straddling the disk 11 on the outer side in the radial direction (the direction from the bottom to the top in FIG. 2). The disk 11 rotates in the direction indicated by the arrow R in FIGS. 1 and 2 when the vehicle moves forward.

  The caliper 13 includes a caliper body 15 fixed to the support member 12, and a disk rotation direction (FIG. 1 and FIG. 2) in a state along the disk axial direction (the direction orthogonal to the plane of FIG. 2) outside the caliper body 15 in the disk radial direction. The two pins 16 are spaced apart from each other in the left-right direction), and the two pins 16 are arranged so as to be movable in the axial direction of the disk 11 with the disk 11 in between. A pair of brake pads 17 to be supported are disposed on both sides in the axial direction of the disk 11 in a state where the positions in the disk rotation direction and the disk radial direction are aligned, and form a pair, and two pairs rotate the disk. Pistons 18a and 18b fitted to the caliper body 15 so as to be slidable in the disk axial direction in a state of being separated in the direction. Is of the so-called opposed piston type having, is intended to brake the rotation of the wheel by at disk rotational direction inlet side piston 18a and the outlet side of the piston 18b is pressed against the brake pad 17 to the disk 11.

  Here, each of the pair of brake pads 17 has a back metal 20 and a lining 21 fixed to the back metal 20 and is symmetrical in the disk rotation direction, and is aligned with each other in the disk rotation direction and the disk radial direction. Are arranged on both sides in the axial direction of the disk 11.

  The caliper body 15 is configured by connecting a pair of divided bodies 23 in a state where the mating surfaces 24 are aligned.

  The pair of divided bodies 23 are provided with connecting portions 25a and 25b respectively having mating surfaces 24 on both sides in the disk rotation direction and connecting the divided bodies 23 to each other, and the connection section 25a on the disk rotation direction inlet side and the disk A cylinder portion 26 is formed so as to be recessed by one step in the disc axial direction from the mating surface 24 between the connecting portion 25b on the rotation direction outlet side.

  Each cylinder portion 26 of the caliper main body 15 is disposed so as to be opposed to each other on both sides in the disk axial direction in a state in which the positions in the disk rotation direction and the disk radial direction are aligned, and two pairs are formed. Cylinder holes 28a and 28b are formed so as to be spaced apart in the rotational direction. That is, a pair of cylinder holes 28a on the disk rotation direction inlet side disposed on both sides in the axial direction of the disk 11 in a state where the positions in the disk rotation direction and the disk radial direction are matched, and positions in the disk rotation direction and the disk radial direction. A pair of cylinder holes 28b on the outlet side in the disk rotation direction disposed on both sides in the axial direction of the disk 11 is formed.

  Here, the cylinder hole 28a on the inlet side in the disk rotation direction has a slightly larger diameter than the cylinder hole 28b on the outlet side, and pistons 18a and 18b that are slidably fitted in the cylinder holes 28a and 28b are also included. The piston 18a on the disk rotation direction inlet side has a slightly larger diameter than the piston 18b on the outlet side. The centers of the cylinder holes 28a and 28b are aligned in the disk radial direction.

  The cylinder part 26 is recessed by one step from the connecting parts 25a and 25b, so that the caliper body 15 has an end surface 30 orthogonal to the disk axial direction of the cylinder part 26 and the side surfaces of the connecting parts 25a and 25b along the disk axial direction. A space portion 32 is formed at the center between 31a and 31b, and a pair of brake pads 17 are disposed in the space portion 32. The brake pad 17 is supported by the above-described two pins 16 so as to be slidable in the disk axial direction while being disposed in the space portion 32.

  The brake pad 17 is pressed against the disk 11 by two pistons 18a and 18b arranged in the disk rotation direction, respectively, and generates a braking force. Here, the side surface 31a on the inlet side of the disk rotation direction and the side surface 31b on the outlet side of each coupling portion 25a, 25b are in contact with the end surfaces of the backing metal 20 of the brake pad 17 in the disk rotation direction, and receive the braking torque during braking. It is a reception.

  One split body 23 of the caliper main body 15 has two bolts that are arranged along the radial direction of the disk and parallel to each other, spaced apart in the disk rotation direction, and disposed substantially outside the brake pads 17 in the disk rotation direction. Mounting holes 34a and 34b are formed, and although not shown, the supporting member 12 is also formed with bolt mounting holes in alignment with the bolt mounting holes 34a and 34b. The caliper body 15 is a radial mount that is fixed to the support member 12 by fastening two mounting bolts (not shown) that are respectively attached to the bolt mounting hole 34a on the disk rotation direction inlet side and the bolt mounting hole 34b on the outlet side. Of the type.

  The cylinder holes 28b on the disk rotation direction outlet side of the caliper body 15 are communicated with each other through a communication passage 36 disposed between the bolt mounting hole 34b on the disk rotation direction outlet side and the brake pad 17. Here, the communication passage 36 extends while inclining toward the disk rotation direction outlet side from the disk rotation direction outlet side and the bottom side of the cylinder hole 28b on the disk rotation direction outlet side of each divided body 23 toward the mating surface 24. The communication holes 37 are in communication with each other when the mating surfaces 24 are joined together so that the divided bodies 23 form the caliper body 15. A bleeder hole 39 for releasing air from the cylinder holes 28a and 28b and the communication passage 36 is communicated with the oblique communication hole 37.

  Further, the cylinder holes 28a and 28b disposed in the same divided body 23 and spaced apart in the disk rotation direction are communicated with each other by intermediate communication passages 38 and 38 formed on the side close to each other and on the bottom side. The inflow port 35 communicates with the intermediate communication path 38 on the mounting hole 34b side.

  Then, the brake fluid is evenly introduced into the gaps between the cylinder holes 28a, 28b and the pistons 18a, 18b by the communication passage 36 and the intermediate communication passage 38. As a result, the pistons 18a, 18b move forward to disengage the brake pad 17 from the disc. 11 will be pressed.

  Here, the caliper 13 configured as described above has a center position C1 between the bolt mounting holes 34a and 34b (a bisected position of a line L1 connecting the center lines of the bolt mounting holes 34a and 34b) in the disk rotation direction. It is made to correspond to the center position of pistons 18a and 18b (the bisection position of the line which connected the center lines of pistons 18a and 18b).

  In the first embodiment, the center position of the brake pad 17 in the disk rotation direction with respect to the center position C1 between the bolt mounting holes 34a and 34b spaced apart in the disk rotation direction (that is, the center position between the pistons 18a and 18b). C2 (the bisector position of the width L2 of the lining 21 in the disk rotation direction (equal to the center position of the width of the back metal 20 in the disk rotation direction)) is the disk rotation direction inlet side (opposite to the communication path 36 or the bleeder hole 39) ) Are offset by a predetermined amount set in advance. As a result, the side surface 31b (in other words, the torque receiving surface on the disk rotation direction outlet side) of the connecting portion 25b on the disk rotation direction outlet side (left side in FIG. 1) of the caliper body 15 is the disk rotation direction inlet side (right side in FIG. 1). Accordingly, the distance between this and the bolt mounting hole 34b on the outlet side in the disk rotation direction (that is, the distance between the portions through which the communication path 36 passes) is increased, in other words, the disk rotation direction of the connecting portion 25b on the outlet side in the disk rotation direction. Is thicker than the same thickness of the connecting portion 25a on the disk rotation direction entrance side.

  According to the disk brake 10 of the first embodiment described above, the center position C2 of the brake pad 17 in the disk rotation direction is the disk rotation with respect to the center position C1 of the bolt mounting holes 34a and 34b that are separated in the disk rotation direction. Since the brake pad 17 is disposed offset to the direction entrance side, even if the width L2 of the brake pad 17 in the disk rotation direction is secured, a connecting pipe that forms a communication path is attached to the outside of the caliper 13 or the disk pad is rotated in the disk rotation direction. Without increasing the distance L1 between the bolt mounting holes 34a and 34b that are separated from each other or increasing the distance L3 between the bolt mounting holes 34a and 34b and the disk 11, the bolt mounting hole 34b and the brake pad 17 on the outlet side in the disk rotation direction. The communication path 36 may be disposed so as not to interfere with them. Kill.

  Therefore, it is possible to suppress the increase in the number of parts, the increase in size, and the deformation due to the braking torque while securing the width of the brake pad 17 in the disk rotation direction so as to ensure sufficient braking performance.

  In addition, the thickness of the connecting portion 25b on the outlet side in the disk rotation direction, which mainly receives the braking torque during forward movement, is greater than the same thickness of the connecting portion 25a on the inlet side in the disk rotation direction. In addition, the weight of this portion can be reduced.

  Next, a disc brake according to a second embodiment of the present invention will be described with reference to FIGS. 3 to 5 focusing on differences from the first embodiment. In addition, the same code | symbol is attached | subjected to the part similar to 1st Embodiment, and the description is abbreviate | omitted.

  The disc brake 10 of the second embodiment is disposed on both sides in the axial direction of the disc 11 in a state in which the positions in the disc rotation direction and the disc radial direction are aligned, and the two pairs are separated in the disc rotation direction. A so-called split pad type having brake pads 17a and 17b provided. That is, a pair of brake pads 17a on the disk rotation direction inlet side disposed on both sides in the axial direction of the disk 11 in a state where the positions in the disk rotation direction and the disk radial direction are matched, and positions in the disk rotation direction and the disk radial direction. And a pair of brake pads 17b on the disc rotation direction outlet side disposed on both sides of the disc 11 in the axial direction.

  An intermediate wall portion 40 that protrudes in the direction of the disk 11 is formed between the cylinder holes 28a and 28b of the cylinder portion 26 of each divided body 23, and the intermediate wall portion 40 is a brake pad that is separated in the disk rotation direction. It is disposed between 17a and 17b.

  One brake pad 17a on the disk rotation direction inlet side is pressed by one piston 18a on the disk rotation direction inlet side, and one brake pad 17b on the disk rotation direction outlet side is pressed on the disk rotation direction outlet side. It is pressed by one piston 18b. Here, the respective side surfaces 31a and 31b of each connecting portion 25 and the respective side surfaces 41a and 41b of the intermediate wall portion 40 abut against the end surfaces of the back pads 20 of the brake pads 17a and 17b in the disk rotation direction, and braking during braking is performed. Torque receiving surface that receives torque. The side surfaces 31a and 41a are arranged in parallel to each other and directed toward the center of the disk 11, and the side surfaces 31b and 41b are also parallel to each other and directed to the side surfaces 31a and 41a in the direction toward the center of the disk 11. It is slanted.

  The two bolt mounting holes 34a and 34b along the disk radial direction and parallel to each other in the one divided body 23 of the caliper main body 15 are further connected to the brake pads 17a and 17b on both sides in the disk rotating direction in the disk rotating direction. It is arranged on both outer sides.

  The communication passage 36 for communicating the cylinder holes 28b on the disk rotation direction outlet side of the caliper body 15 is disposed between the bolt mounting hole 34b on the disk rotation direction outlet side and the brake pad 17b on the disk rotation direction outlet side. Has been.

  Here, as in the first embodiment, the caliper 13 having the above-described configuration has a center position C1 between the bolt mounting holes 34a and 34b (a line L1 connecting the center lines of the bolt mounting holes 34a and 34b in the disk rotation direction). Is divided into the center position of the pistons 18a and 18b (the bisector position of the line L4 connecting the center lines of the pistons 18a and 18b).

  In the second embodiment, the brake pads 17a separated in the disk rotation direction with respect to the center position C1 between the bolt mounting holes 34a and 34b separated in the disk rotation direction (that is, the center position between the pistons 18a and 18b). 17b center position C3 (center position between a line L5 connecting both ends of the disc 20 in the disc rotation direction of the back pad 20 of the brake pad 17a and a line L6 connecting both ends of the disc 20 of the back pad 20 of the brake pad 17b (Equal to the center position between the line connecting both ends of the lining 21 of the brake pad 17a in the disk rotation direction and the line connecting both ends of the lining 21 of the brake pad 17b in the disk rotation direction)) It is arranged with a predetermined offset offset on the inlet side (opposite side to the communication path 36).In FIG. 5, C4 is the center position of the width L5 of the brake pad 17a, and C5 is the center position of the width L6 of the brake pad 17b.

  As a result, similar to the first embodiment, the side surface 31b (in other words, the torque on the disc rotation direction outlet side) of the connecting portion 25b on the disc rotation direction exit side of the caliper body 15 (left side in FIGS. 3 and 4 and right side in FIG. 5). The receiving surface is shifted to the disk rotation direction inlet side (the right side in FIGS. 3 and 4 and the left side in FIG. 5) and the distance between the bolt mounting hole 34b on the disk rotation direction outlet side (that is, the portion through which the communication path 36 passes). In other words, the thickness of the connecting portion 25b on the disc rotation direction outlet side in the disc rotation direction is greater than the same thickness of the connecting portion 25a on the disc rotation direction inlet side.

  According to the disc brake 10 of the second embodiment described above, the disc rotation of the brake pads 17a and 17b separated in the disc rotation direction with respect to the center position C1 of the bolt mounting holes 34a and 34b separated in the disc rotation direction. Since the center position C3 in the direction is offset to the disk rotation direction entrance side, the connection that forms the communication path outside the caliper 13 even if the width of the brake pads 17a and 17b in the disk rotation direction is secured. Bolts on the outlet side in the disk rotation direction without attaching pipes, increasing the distance between the bolt mounting holes 34a and 34b spaced apart in the disk rotation direction, or increasing the distance between the bolt mounting holes 34a and 34b and the disk 11 Widen the gap between the mounting hole 34b and the brake pad 17b on the disc rotation direction outlet side. It can be disposed the communication passage 36 so as not to interfere with these in between.

  Accordingly, the width of the brake pads 17a and 17b in the disk rotation direction can be secured so as to ensure sufficient braking performance, and an increase in the number of parts, an increase in size, and deformation due to braking torque can be suppressed.

  In addition, the thickness of the connecting portion 25b on the outlet side in the disk rotation direction, which mainly receives the braking torque during forward movement, is greater than the same thickness of the connecting portion 25a on the inlet side in the disk rotation direction. Can be improved.

  In the second embodiment, in order to reduce the size of the caliper 13 while suppressing the deformation of the caliper 13 due to the braking torque, the distance L1: the bolt mounting holes 34a, 34b from the center of the disk 11 to the bolt mounting holes 34a, 34b. The distance L3 to the center of 34b is preferably about 4.8: 1, and the distance L7 from the center of the disk 11 to the brake pads 17a and 17b: from the center of the disk 11 to the center of the bolt mounting holes 34a and 34b. The distance L3 is preferably about 0.4: 1.

  Further, in order to increase the area of the brake pads 17a and 17b while suppressing the deformation of the caliper 13 due to the braking torque, the distance L1 between the bolt mounting holes 34a and 34b: the total width L5 + L6 of the brake pads 17a and 17b, A ratio of about 1.4: 1 is preferable.

It is a plane sectional view showing the disc brake of a 1st embodiment of the present invention. It is a side view which shows the disc brake of 1st Embodiment of this invention. It is a top view which shows the disc brake of 2nd Embodiment of this invention. It is the top view cut | disconnected along XX in FIG. 2 which shows the disc brake of 2nd Embodiment of this invention. It is side sectional drawing which shows the disc brake of 2nd Embodiment of this invention. It is a plane sectional view showing a disc brake. It is a plane sectional view showing a disc brake. It is a plane sectional view showing a disc brake.

Explanation of symbols

10 Disc brake 11 Disc 17, 17a, 17b Brake pad 18a, 18b Piston 28a, 28b Cylinder hole 13 Caliper 12 Support member 34a, 34b Bolt mounting hole 36 Communication path

Claims (3)

A pair of brake pads disposed on opposite sides of the disk;
A plurality of pistons spaced apart in the disc rotation direction to press the brake pads against the disc;
A cylinder hole in which the piston is slidably fitted, and a caliper formed opposite to the disc,
The caliper has two bolt mounting holes that extend in the radial direction of the disk and are spaced apart in the rotational direction of the disk, and are fixed to the non-rotating portion of the vehicle body by inserting the mounting bolts into the bolt mounting holes. Radial mount type disc brake
Inside the caliper, a communication passage for communicating the cylinder holes facing each other is disposed between the bolt mounting hole and the brake pad only on one side in the disk rotation direction,
In the disk rotation direction, the bolt mounting holes are arranged so that the center positions of the line segments connecting the centers of pressing of the plurality of pistons to the brake pads coincide with the center positions of the bolt mounting holes. A disc brake characterized in that a center position in the disc rotation direction of the brake pad is offset from the other side in the disc rotation direction with respect to the center position between them. A brake pad disposed opposite to both sides of the disk to form a pair and a plurality of pairs spaced apart in the disk rotation direction;
A plurality of pairs of pistons that respectively press the brake pads against the disc;
A cylinder hole in which the piston is slidably fitted, and a caliper formed so as to face each other across the disk,
The caliper has two bolt mounting holes that extend in the radial direction of the disk and are spaced apart in the rotational direction of the disk, and are fixed to the non-rotating portion of the vehicle body by inserting the mounting bolts into the bolt mounting holes. Radial mount type disc brake
Inside the caliper, a communication passage for communicating the cylinder holes facing each other is disposed between the bolt mounting hole and the brake pad only on one side in the disk rotation direction,
In the disk rotation direction, the bolts are disposed such that the center positions of the line segments connecting the centers of pressing of the plurality of pairs of pistons to the brake pads coincide with the center positions of the bolt mounting holes. A disc brake characterized in that the center position of the plurality of pairs of brake pads in the disc rotation direction is offset from the other side in the disc rotation direction with respect to the center position between the holes. The pistons are opposed to each other on both sides of the disk and are arranged in two pairs spaced apart in the disk rotation direction. In the disk rotation direction, a line segment that connects the pressure centers of the two pairs of pistons to the brake pad. The disc brake according to claim 1, wherein the disc brake is disposed so that a center position thereof coincides with a center position between the bolt mounting holes.

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