JP6789150B2 - Disc brake - Google Patents

Description

The present invention relates to a disc brake.

There is a disc brake in which the inlet port is provided at a position off the center of the bottom of the cylinder (see, for example, Patent Document 1).

Jikkai Sho 63-121830

By the way, it is desired to suppress air accumulation in disc brakes.

An object of the present invention is to provide a disc brake capable of suppressing air accumulation.

In order to achieve the above object, in the present invention, a supply hole for supplying brake fluid is formed in the caliper so as to communicate with the cylinder bore, and the supply hole is a position on the upper side in the vertical direction of the inner bottom portion of the cylinder bore. At a position where the inner peripheral surface of the cylinder bore and the position of the cylinder bore overlap in the radial direction, and the through hole extending vertically upward of the cylinder bore is vertically above the opening to the cylinder bore. Have been placed.
Further, in the present invention, the caliper is provided with two cylinder portions arranged side by side in the rotation direction of the disc, and a piston pressing one of the pair of pads can be slidable on the two cylinder portions. A cylinder bore to be accommodated is formed, and a supply hole for supplying brake liquid communicates with the cylinder bore in the lower cylinder portion which is vertically lower in the vehicle mounting state among the two cylinder portions. The supply hole is formed at a position on the upper side of the inner bottom portion of the cylinder bore in the vertical direction, and is arranged so that the inner peripheral surface of the cylinder bore and the inner peripheral surface of the supply hole are in contact with each other, and the contact point is vertical. It is arranged so as to be vertically above the opening of the communication hole communicating with the cylinder bore on the upper side in the direction.

According to the present invention, it is possible to suppress air accumulation.

A side sectional view showing a disc brake of the first embodiment. The perspective view which shows the caliper body of the disc brake of 1st Embodiment. A cross-sectional view showing a vehicle mounting state of the caliper body of the disc brake of the first embodiment, which is a cross-sectional view taken along a plane orthogonal to the central axis of the cylinder bore including the central axis of the bleeder hole. FIG. 3 is a partial cross-sectional view showing a vertically upper portion of the caliper body of the disc brake of the first embodiment in the vertical direction from the central axis of the cylinder bore on the upper side in the vertical direction. FIG. 3 is a cross-sectional view taken along a plane orthogonal to the central axis of the cylinder bore including the central axis of the bleeder hole, showing another vehicle mounting state of the caliper body of the disc brake of the first embodiment. FIG. 3 is a cross-sectional view taken along a plane orthogonal to the central axis of the cylinder bore including the central axis of the bleeder hole, showing another vehicle mounting state of the caliper body of the disc brake of the first embodiment. The perspective view which shows the caliper body of the disc brake of the 2nd Embodiment. A cross-sectional view showing a vehicle mounting state of the caliper body of the disc brake of the second embodiment, which is a cross-sectional view taken along a plane orthogonal to the central axis of the cylinder bore including the central axis of the bleeder hole. FIG. 5 is a cross-sectional view taken along a plane orthogonal to the central axis of the cylinder bore, including the central axis of the bleeder hole, showing another vehicle mounting state of the caliper body of the disc brake of the second embodiment. FIG. 5 is a cross-sectional view taken along a plane orthogonal to the central axis of the cylinder bore, including the central axis of the bleeder hole, showing another vehicle mounting state of the caliper body of the disc brake of the second embodiment.

"First embodiment"
The first embodiment will be described below with reference to FIGS. 1 to 6.

FIG. 1 shows the disc brake 10 of the first embodiment. The disc brake 10 applies a braking force to a vehicle such as an automobile, and specifically, is for braking the front wheels of a four-wheeled automobile. The disc brake 10 brakes the vehicle by stopping the rotation of the disc 11 that rotates together with the wheels (not shown). Hereinafter, the direction of the central axis of the disc 11 is referred to as the disc axial direction, the radial direction of the disc 11 is referred to as the disc radial direction, and the rotation direction (circumferential direction) of the disc 11 is referred to as the disc rotation direction.

The disc brake 10 includes a carrier 12, a pair of pads 13 and 14, and a caliper 15. The carrier 12 is arranged so as to straddle the outer peripheral side of the disc 11 and is fixed to the non-rotating portion of the vehicle. The pair of pads 13 and 14 are supported by the carrier 12 so as to be movable in the disc axial direction, and are arranged on both sides of the disc 11 in the disc axial direction. In other words, the carrier 12 movably supports a pair of pads 13 and 14 arranged on both sides of the disk 11. The caliper 15 is provided on the carrier 12 so as to be movable in the disc axial direction, and is arranged so as to straddle the disc 11. The caliper 15 sandwiches a pair of pads 13 and 14 and presses them against both sides of the disc 11.

The caliper 15 has a caliper body 20, a piston 21, a piston seal 22, and a piston boot 23.

The caliper body 20 is formed by processing a metal material integrally molded by casting, and is specifically made of an aluminum alloy. It is also possible that the caliper body 20 is made of cast iron such as ductile cast iron. The caliper body 20 includes a cylinder portion 26 located on one side of the disc 11 in the disc axial direction, a bridge portion 27 extending from the outside of the cylinder portion 26 in the disc radial direction so as to straddle the outer periphery of the disc 11, and a bridge portion 27. It has a claw portion 28 that extends inward in the disc radial direction from the side opposite to the cylinder portion 26 of the disc 11 and is located on the other side of the disc 11 in the disc axial direction. Further, as shown in FIG. 2, the caliper body 20 has a pair of arm portions 29 extending from the cylinder portion 26 on both sides in the disc rotation direction, and a disc radial direction from the base positions of the pair of arm portions 29 of the cylinder portion 26. It has a pair of projecting portions 30 projecting to the opposite side of the bridge portion 27 of the above. The caliper body 20 is movably supported by the carrier 12 shown in FIG. 1 at a pin (not shown) attached to the mounting holes 31 of the pair of arm portions 29.

As shown in FIG. 1, the caliper body 20 of the caliper 15 has a cylinder bore 35 in the cylinder portion 26 having one end opened toward the claw portion 28 side and recessed toward the side opposite to the disc 11 in the disc axial direction. It is formed. As shown in FIG. 3, the caliper body 20 is provided with a plurality of cylinder portions 26, each of which has a cylinder bore 35 formed therein, arranged side by side in the disc rotation direction, specifically, two cylinder portions. Therefore, the caliper body 20 is formed with a plurality of cylinder bores 35 arranged in the disc rotation direction, specifically, two locations. The cylinder bores 35 provided in each of the two cylinder portions 26 have the same shape, and are provided side by side in the disc rotation direction by aligning the positions in the disc axial direction and the disc radial direction and shifting the positions in the disc rotation direction. There is. Therefore, the caliper 15 including the caliper body 20 includes a plurality of cylinder bores 35 arranged in the disc rotation direction.

As shown in FIG. 1, by forming a plurality of cylinder bores 35, the caliper body 20 has a cylinder bottom portion 36 including an inner bottom surface 38 of the plurality of cylinder bores 35 on the side opposite to the claw portion 28. It has a cylinder body portion 37 extending from the cylinder bottom portion 36 toward the claw portion 28 side and including the inner peripheral surfaces 39 of the plurality of cylinder bores 35.

The piston 21 is housed in each of the cylinder bores 35 so as to be slidable in the disc axial direction. The piston 21 presses a pad 13 arranged between the piston 21 and the disc 11, which is one of the pair of pads 13 and 14. In other words, each of the two cylinder portions 26 is formed with a cylinder bore 35 in which a piston 21 that presses one of the pair of pads 13 and 14 is slidably accommodated. Of the pair of pads 13 and 14, the pad 13 is an inner pad arranged inside in the vehicle width direction, and the pad 14 is an outer pad arranged outside in the vehicle width direction.

The inner peripheral surface 39 of the cylinder bore 35 has a guide inner peripheral surface 41 which is a cylindrical surface for guiding the movement of the piston 21. The inner peripheral surface 39 of the cylinder bore 35 has an annular large-diameter groove 42 that is recessed radially outward from the guide inner peripheral surface 41 on the cylinder bottom 36 side of the guide inner peripheral surface 41. The groove bottom diameter of the large-diameter groove 42 is larger than that of the guide inner peripheral surface 41. The large-diameter groove 42 is arranged at the end on the inner peripheral surface 39 of the cylinder bore 35 on the cylinder bottom 36 side. The inner peripheral surface 39 of the cylinder bore 35 has an annular piston seal groove 45 recessed radially outward from the guide inner peripheral surface 41 at an intermediate position on the side opposite to the cylinder bottom 36 of the guide inner peripheral surface 41. ing. The groove bottom diameter of the piston seal groove 45 is larger than that of the guide inner peripheral surface 41.

The cylinder portion 26 is formed with an annular boot fitting hole 48 that is recessed radially outward from the guide inner peripheral surface 41 of the cylinder bore 35 on the claw portion 28 side of the cylinder bore 35. The boot fitting hole 48 is formed at the end position of the cylinder portion 26 on the claw portion 28 side. The inner diameter of the boot fitting hole 48 is larger than that of the guide inner peripheral surface 41 of the cylinder bore 35. An opening 51 of the cylinder bore 35 is opened at the bottom of the boot fitting hole 48. The guide inner peripheral surface 41, the large diameter groove 42, and the piston seal groove 45 of the inner peripheral surface 39 of the cylinder bore 35 are arranged in the cylinder body portion 37 of the cylinder portion 26.

The cylinder bore 35 has the above-mentioned inner bottom surface 38 on the side opposite to the guide inner peripheral surface 41 of the large diameter groove 42. The inner bottom surface 38 includes an annular R-chamfered surface 53 connected to the large-diameter groove 42, an annular flat annular surface 54 extending inward in the radial direction from the inner end edge of the R-chamfered surface 53 in the radial direction. It has an annular projecting portion 55 that slightly projects from the radial inside of the annular surface 54 to the opening 51.

The large-diameter groove 42, the guide inner peripheral surface 41, the piston seal groove 45, and the boot fitting hole 48 are formed by cutting the material of the caliper body 20.

The piston 21 includes a disk-shaped piston bottom portion 71 and a cylindrical piston body portion 72. The piston 21 is formed in a bottomed tubular shape in which the end of the piston body 72 opposite to the piston bottom 71 is opened. The piston body 72 is formed with an annular locking groove 75 that is radially inwardly recessed from the outer diameter surface 74 formed of a cylindrical surface on the side opposite to the piston bottom 71 in the axial direction. The piston 21 is housed in the cylinder bore 35 so that the piston bottom 71 is located on the cylinder bottom 36 side in the cylinder bore 35, and in this state, the tip on the claw portion 28 side protrudes toward the claw portion 28 from the cylinder bore 35. ing. The piston 21 is formed with a locking groove 75 on the tip side protruding from the cylinder bore 35 in this way. The caliper 15 is a two-pot caliper in which two cylinder bores 35 are provided in the caliper body 20 and are arranged in each of the cylinder bores 35 to include two pistons 21.

The piston seal 22 is fitted in the piston seal groove 45 of the cylinder bore 35, and the piston 21 is fitted on the inner peripheral side of the piston seal 22. The piston seal 22 seals the gap between the cylinder portion 26 and the piston 21, and supports the piston 21 so as to be movable in the axial direction by the guide inner peripheral surface 41 of the cylinder bore 35.

The piston boot 23 includes an annular large-diameter fitting portion 81 that fits into the boot fitting hole 48 of the cylinder portion 26, an annular small-diameter fitting portion 82 that fits into the locking groove 75 of the piston 21, and these. It has a stretchable bellows portion 83 between them. The piston boot 23 covers the outer peripheral portion exposed from the cylinder portion 26 of the portion on the cylinder bore 35 side of the locking groove 75 of the piston 21, and as the piston 21 moves with respect to the cylinder portion 26, the cylinder portion 26 and the piston The intermediate bellows 83, which is not fixed to 21, expands and contracts.

The cylinder bottom 36 is in a range in which the inner bottom surface 38 of one cylinder bore 35 is projected in the disc axial direction, and the entire surface of the inner bottom surface 38 overlaps with the positions in the disc radial direction and the disc rotation direction, and the bottom portion of the one cylinder bore 35 The inner bottom portion 61 and the inner bottom surface 38 of the other cylinder bore 35 are projected in the disc axial direction, and the positions of the entire inner bottom surface 38 in the disc radial direction and the disc rotation direction overlap with each other in the other cylinder bore. It has an inner bottom portion 61 that constitutes the bottom portion of 35. The R chamfered surface 53, the annular surface 54, and the protruding portion 55 of the inner bottom surface 38 are provided on the inner bottom portion 61.

As shown in FIG. 2, the outer bottom surface 63 of the caliper body 20 on the side opposite to the claw portion 28 of the cylinder bottom portion 36 of the two cylinder portions 26 is a range of the main surface portion 64 extending as one plane and the main surface portion 64. It has a recess 65 formed therein that is recessed from the main surface portion 64 toward the claw portion 28 in the disc axial direction. The recess 65 is a counterbore hole, which is formed by cutting the material of the caliper body 20, and its bottom surface 66 is a circular flat surface. A supply hole 101 is formed at the center of the recess 65. The recess 65 and the supply hole 101 are formed on one end side of the cylinder bottom 36 in the disc rotation direction of the caliper 15 in the disc rotation direction.

The disc brake 10 of the first embodiment is attached to the vehicle so that the caliper body 20 is in the posture shown in FIG. This vehicle mounting state is defined as the vehicle mounting state. In FIG. 3 (the same applies to FIGS. 5, 6 and 8 to 10 described later), the front of the vehicle in the vehicle-mounted state is indicated by an arrow X, and the vertical direction in the vehicle-mounted state is indicated by an arrow Z.

As shown in FIG. 3, the caliper body 20 is in a posture in which the two cylinder portions 26 and the two cylinder bores 35 are arranged vertically side by side in the vehicle mounted state. More specifically, in the vehicle mounted state, the caliper body 20 is in a posture in which the two cylinder portions 26 and the two cylinder bores 35 are arranged side by side in the vertical direction so as to be aligned in the horizontal direction. In other words, in the two cylinder bores 35, the lines connecting the central axes of the two cylinder bores 35 orthogonal to each other are vertically arranged. If the direction of this line is the caliper arrangement direction C, the caliper arrangement direction C is the vertical direction Z, and the vehicle mounting angle θ of the caliper body 20 which is the angle formed by the caliper arrangement direction C and the vertical direction Z is 0 degrees. It becomes. Hereinafter, of the two cylinder portions 26, the upper cylinder portion 26 in the vertical direction is referred to as the upper cylinder portion 26 (U) and the lower cylinder portion 26 in the vertical direction is referred to as the lower cylinder portion 26 (L) in the vehicle mounted state. Distinguish. Further, of the two cylinder bores 35, the cylinder bore 35 on the upper side in the vertical direction is referred to as the cylinder bore 35 (U) and the cylinder bore 35 on the lower side in the vertical direction is referred to as the cylinder bore 35 (L) in the vehicle mounted state.

The supply hole 101 is formed in the upper cylinder portion 26 (U) on the upper side in the vertical direction, and is formed in the cylinder bore 35 (U) of one upper cylinder portion 26 (U) and the lower cylinder portion 26 (L) of the other. It is formed so as to communicate with the end position on the opposite side of the cylinder bore 35 (L). The central axis of the supply hole 101 is arranged on a surface including the central axis of the cylinder bores 35 at two locations. In other words, the central axes of the two cylinder bores 35 and the supply holes 101 are arranged in the same plane.

In the vehicle mounted state, as shown in FIG. 4, the supply hole 101 is formed so as to open in the upper cylinder portion 26 (U) on the upper side in the vertical direction at the upper end portion in the vertical direction of the inner bottom portion 61 of the cylinder bore 35 (U). Has been done. The supply hole 101 opens in the cylinder bore 35 (U) and communicates with the supply hole 101 to supply the brake fluid pressure into the cylinder bore 35 (U). The supply hole 101 is formed parallel to the central axis of the cylinder bore 35 (U), that is, along the disk axis direction. A female screw 103 is formed in the supply hole 101 so as to form an inner peripheral surface 102 thereof. In the supply hole 101, a piping bolt 111 for attaching the brake pipe 110 to the caliper body 20 is screwed into the female screw 103. Therefore, the supply hole 101 is a piping hole to which the piping is attached.

An annular seal washer 112 is in contact with the bottom surface 66 of the recess 65 of the caliper body 20, and a joint 113 provided at the end of the brake pipe 110 is in contact with the seal washer 112. An annular seal washer 120 is in contact with the joint 113 on the opposite side of the joint 113 from the seal washer 112. Then, the piping bolt 111 penetrates the seal washer 120, the joint 113, and the seal washer 112 at the screw shaft portion 122, and is screwed into the female screw 103 of the supply hole 101. As a result, the head 123 of the piping bolt 111 sandwiches the seal washer 112, the joint 113, and the seal washer 120 with the upper cylinder portion 26 (U) of the caliper body 20. In this way, the brake pipe 110 is attached to the caliper body 20 with the pipe bolt 111. In this way, the screw length of the screw shaft portion 122 of the pipe bolt 111 with the brake pipe 110 attached to the caliper body 20 to the female screw 103 is shorter than the total length of the supply hole 101.

The piping bolt 111 is formed with a passage 124 that opens at the tip of the screw shaft portion 122 inside, which is called a union bolt or a banjo bolt, and the passage 124 communicates with the passage in the brake pipe 110 on the other hand. On the other hand, it communicates with the inside of the cylinder bore 35 (U) via a portion deeper than the piping bolt 111 of the supply hole 101. As a result, the brake fluid supplied via the brake pipe 110 passes through the passage 124 in the pipe bolt 111 and is introduced into the cylinder bore 35 (U).

The position of the supply hole 101 overlaps with the inner peripheral surface 39 of the cylinder bore 35 (U) in the radial direction of the cylinder bore 35 (U). More specifically, in the supply hole 101, the positions of the portions of the inner peripheral surface 102 that form the valley bottom of the female screw 103 are the groove bottom position of the large diameter groove 42 on the inner peripheral surface 39 of the cylinder bore 35 and the cylinder bore 35 (U). ) Are aligned in the radial direction.

As shown in FIG. 3, the caliper body 20 is provided with a bleeder hole 92 for bleeding air from each cylinder bore 35 when filling each cylinder bore 35 with brake fluid through the supply hole 101. The bleeder hole 92 is formed so as to open upward in the vertical direction in the vehicle-mounted state so that air can be bleeded.

The bleeder hole 92 penetrates the cylinder bore 35 (U) on the side close to the one protruding portion 30 from the one protruding portion 30 on the upper side in the vertical direction close to the supply hole 101 among the pair of protruding portions 30, and the cylinder body. It penetrates the partition wall 90 between the cylinder bore 35 (U) and the cylinder bore 35 (L) of the portion 37, extends from one of the protruding portions 30 to the cylinder bore 35 (L) on the far side, and is a straight line. It is in shape.

The bleeder hole 92 is formed in a large-diameter hole 93 formed so as to open to the outer surface in one of the protruding portions 30, a portion of the one protruding portion 30 on the cylinder bore 35 (U) side, and a partition wall portion 90. It has a small diameter hole 94. The small diameter hole 94 has a smaller inner diameter than the large diameter hole 93.

The small-diameter hole 94 is provided in a mouth hole 96 (through hole) arranged in one protruding portion 30 and adjacent to the large-diameter hole 93, and one cylinder bore 35 (U) and the other cylinder bore 35 (through holes) provided in the partition wall 90. It has a communication hole 97 that communicates with L). The bleeder hole 92 has a linear shape as a whole including a communication hole 97 that communicates the cylinder bore 35 (U) in which the supply hole 101 is arranged and the cylinder bore 35 (L) adjacent thereto. In other words, the bleeder hole 92 is a single linear hole that penetrates one cylinder bore 35 (U), penetrates the partition wall 90, and extends to the other cylinder bore 35 (L). The bleeder hole 92 is arranged on a plane whose central axis is orthogonal to the central axis of the cylinder bore 35. The mouth hole 96 extends vertically upward on one of the cylinder bores 35 (U). The small-diameter hole 94 is opened at the position of the large-diameter groove 42 of each cylinder bore 35, as shown by the mouth hole 96 in FIG. The bleeder hole 92 shown in FIG. 3 is formed by forming a pilot hole of a large diameter hole 93 and a small diameter hole 94 by drilling with a single drill, and then further screwing the large diameter hole 93. .. A bleeder plug (not shown) is screwed into the large diameter hole 93.

Here, in the caliper body 20, a pair of arm portions 29 are arranged on an extension line of a straight line connecting the central axes of the two cylinder bores 35 at right angles to them. Therefore, one linear bleeder hole 92 is formed so as to avoid these arm portions 29 so as to be inclined with respect to this extension line. As a result, the opening 96a of the mouth hole 96 of the bleeder hole 92 to the cylinder bore 35 (U) is at the end position of the cylinder bore 35 (U) opposite to the cylinder bore 35 (L), that is, in the vehicle mounted state. It is deviated from the upper end portion in the circumferential direction of the cylinder bore 35 (U). Further, the opening 97a of the communication hole 97 to the cylinder bore 35 (U) is arranged near the end position on the most cylinder bore 35 (L) side of the cylinder bore 35 (U). The opening 97b of the communication hole 97 to the cylinder bore 35 (L) is arranged near the end position on the most cylinder bore 35 (U) side of the cylinder bore 35 (L), that is, near the upper end portion in the vehicle mounted state. ..

In the vehicle mounted state, the bleeder hole 92 is formed so as to be inclined with respect to the extension line of the straight line connecting the central axes of the two cylinder bores 35 as described above, and as a result, the bleeder hole 92 reaches the cylinder bore 35 (U) of the mouth hole 96. The entire opening 96a of the cylinder bore 35 (U) is arranged below the upper end of the cylinder bore 35 (U). On the other hand, the upper end of the opening 97b of the communication hole 97 to the cylinder bore 35 (L) is arranged at the upper end of the cylinder bore 35 (L).

In the vehicle mounted state, as described above, the supply hole 101 for supplying the brake fluid pressure to the plurality of cylinder bores 35 is in the vertical direction of the inner bottom portion 61 of the uppermost cylinder bore 35 (U) of the plurality of cylinder bores 35. It is formed so as to open at a position on the upper side. Moreover, the cylinder bore 35 (U) is the position of the portion of the inner peripheral surface 102 of the supply hole 101 that forms the valley bottom of the female screw 103 and the groove bottom position of the large diameter groove 42 of the inner peripheral surface 39 of the cylinder bore 35 (U). The matching position P shown in FIG. 3, which matches in the radial direction of the cylinder bore 35 (U), is arranged at the upper end position in the vertical direction of the cylinder bore 35 (U).

As a result, the supply hole 101 is arranged at a position vertically above the opening 96a of the mouth hole 96 of the bleeder hole 92 to the cylinder bore 35 (U) in the vehicle mounted state. More specifically, the matching position P, which is the upper end of the supply hole 101 in the vertical direction, is arranged at a position above the entire opening 96a of the mouth hole 96 in the vertical direction.

When the brake fluid is injected into the two cylinder bores 35 in the vehicle-mounted state, the supply hole 101 is passed through the brake pipe 110 and the pipe bolt 111 with the bleeder plug (not shown) provided in the bleeder hole 92 open. Inject the brake fluid from. Then, the brake fluid is first injected from the cylinder bore 35 (U) into the cylinder bore 35 (L) through the communication hole 97 by gravity. Here, as a result of the upper end of the opening 97b on the lower side in the vertical direction of the communication hole 97 being arranged at the upper end of the cylinder bore 35 (L), the air in the cylinder bore 35 (L) is satisfactorily discharged from the communication hole 97. The cylinder bore 35 (L) is filled with the brake fluid.

Subsequently, the brake fluid fills the communication hole 97 and is injected into the cylinder bore 35 (U) from the lower side to fill the cylinder bore 35 (U). However, since the entire opening 96a of the mouth hole 96 of the bleeder hole 92 to the cylinder bore 35 (U) is arranged below the upper end position of the cylinder bore 35 (U), the opening of the cylinder bore 35 (U) Air pools may occur in the upper range in the vertical direction with respect to the portion 96a.

On the other hand, the cylinder bore 35 is the position of the portion of the inner peripheral surface 102 of the supply hole 101 that forms the valley bottom of the female screw 103 and the groove bottom position of the large diameter groove 42 of the inner peripheral surface 39 of the cylinder bore 35 (U). The matching position P located in the radial direction of (U) is arranged at the upper end position in the vertical direction of the cylinder bore 35 (U), which is vertically above the entire opening 96a of the mouth hole 96 of the bleeder hole 92. .. Therefore, the brake fluid discharged from the passage 124 of the piping bolt 111 of the supply hole 101 and introduced into the cylinder bore 35 (U) through the inner peripheral surface 102 of the supply hole 101 is introduced at the position of the air pool. The air in the air pool is pushed toward the mouth hole 96, reducing the amount of air in the air pool.

In the disc brake 10 having the above configuration, when the brake fluid pressure is introduced from the supply hole 101 to the cylinder bore 35 (U) via the brake pipe 110 and the pipe bolt 111, the cylinder bore 35 (U) and the communication hole 97 are formed therein. Brake fluid pressure acts on the piston 21 at the cylinder bore 35 (L) communicating with the piston 21. As a result, both pistons 21 advance toward the disc 11 and press the pads 13 arranged between the pistons 21 and the disc 11 toward the disc 11. As a result, the pad 13 moves and comes into contact with the disk 11. Further, the reaction force of this pressing causes the caliper body 20 to move with respect to the carrier 12, and the claw portion 28 presses the pad 14 arranged between the claw portion 28 and the disc 11 toward the disc 11. As a result, the pad 14 comes into contact with the disc 11. In this way, the caliper 15 sandwiches the pair of pads 13 and 14 between the pistons 21 and the claws 28 from both sides in the disc axial direction and presses them against both sides of the disc 11 by the operation of the plurality of pistons 21. As a result, the caliper 15 imparts frictional resistance to the disc 11 to generate braking force.

The disc brake described in Patent Document 1 is provided with an inlet port at a position deviated from the center of the bottom of the cylinder. By the way, the disc brake has various restrictions on the shape and the posture in the vehicle mounted state, and as described above, the bleeder hole may not be opened at the upper end of the cylinder bore at the uppermost position.

On the other hand, in the disc brake 10 of the first embodiment, the supply holes 101 overlap in the radial direction of the inner peripheral surface 39 of the cylinder bore 35 (U) and the cylinder bore 35 (U), and the bleeder holes 92. It is arranged at a position above the opening 96a of the mouth hole 96 to the cylinder bore 35 (U) in the vertical direction. More specifically, the position of the portion of the inner peripheral surface 102 of the supply hole 101 that forms the valley bottom of the female screw 103 is the position of the groove bottom of the large-diameter groove 42 on the inner peripheral surface 39 of the cylinder bore 35 (U) and the cylinder bore. The positions are matched in the radial direction of 35 (U), and the matching position P, which is the upper end of the supply hole 101 in the vertical direction, is arranged at a position above the entire opening 96a of the mouth hole 96 in the vertical direction. ing. As a result, the brake fluid introduced into the cylinder bore 35 (U) through the supply hole 101 can push the air in the air pool toward the mouth hole 96, and the air pool can be suppressed.

Here, in the first embodiment, the vehicle mounting angle θ of the caliper body 20 is set to 0 degrees. For example, as shown in FIG. 5, the caliper body 20 has a vehicle mounting angle θ of 0 degrees in the X direction. It may be tilted forward (that is, tilted forward) at a larger angle. Also in this case, if the upper end position of the supply hole 101 in the vertical direction is located at least above the lower end position of the opening 96a of the mouth hole 96 in the vertical direction, the cylinder bore 35 passes through the supply hole 101. The brake fluid introduced in (U) can push the air in the air pool into the mouth hole 96, and the air pool can be suppressed.

Further, as shown in FIG. 6, the caliper body 20 may be tilted backward so that the vehicle mounting angle θ is larger than 0 degrees in the direction opposite to the X direction. Also in this case, if the upper end position of the supply hole 101 in the vertical direction is located at least above the lower end position of the opening 96a of the mouth hole 96 in the vertical direction, the cylinder bore 35 passes through the supply hole 101. The brake fluid introduced in (U) can push the air in the air pool into the mouth hole 96, and the air pool can be suppressed.

"Second embodiment"
Next, the second embodiment will be described mainly based on FIGS. 7 to 10 with a focus on differences from the first embodiment. The parts common to the first embodiment are represented by the same name and the same reference numerals.

As shown in FIG. 7, in the second embodiment, the recess 65 and the supply hole 101 similar to those in the first embodiment are located at different positions from those in the first embodiment, near the center of the cylinder bottom 36 in the disk rotation direction. Is formed in.

Also in the second embodiment, as shown in FIG. 8, in the vehicle mounted state, the caliper body 20 is in a posture in which the two cylinder bores 35 are arranged side by side in the vertical direction with the positions aligned in the horizontal direction. The angle θ is 0 degrees.

In the second embodiment, the supply hole 101 for supplying the brake fluid pressure to the plurality of cylinder bores 35 is the upper cylinder bore 35 (U) which is the uppermost part of the plurality of cylinder bores 35 in the vertical direction in the vehicle mounted state. The lower cylinder portion 26 (L), which is the lower side in the vertical direction, of the two cylinder portions 26 so as to open to the upper end in the vertical direction of the inner bottom portion 61 of the target cylinder bore 35 (L) on the lower side other than the above. It is formed. The central axis of the supply hole 101 is arranged on a surface including the central axis of the cylinder bores 35 at two locations.

Similar to the relationship with the cylinder bore 35 (U) in the first embodiment, the supply hole 101 overlaps the position of the inner peripheral surface 39 of the cylinder bore 35 (L) in the radial direction of the cylinder bore 35 (L). The inner peripheral surface 102 thereof and the inner peripheral surface 39 of the cylinder bore 35 (L) coincide with each other in the radial direction of the cylinder bore 35 (L). The matching matching position P is arranged at the upper end position in the vertical direction of the inner bottom portion 61 of the cylinder bore 35 (L).

The bleeder hole 92 is the same as that of the first embodiment, and communicates between the cylinder bore 35 (L) provided with the supply hole 101 and the cylinder bore 35 (U) adjacent to the upper side of the cylinder bore 35 (L) in the vertical direction. It has a linear shape as a whole including the hole 97 (through hole). The communication hole 97 extends upward in the vertical direction of the cylinder bore 35 (L).

Then, in the vehicle-mounted state, the supply hole 101 is arranged at a position vertically above the opening 97b of the communication hole 97 of the bleeder hole 92 to the cylinder bore 35 (L). More specifically, the coincident position P between the inner peripheral surface 102 of the supply hole 101 and the inner peripheral surface 39 of the cylinder bore 35 (L), which is the upper end in the vertical direction, is more vertical than the lower end of the opening 97b of the communication hole 97. It is located on the upper side in the direction and coincides with the upper end of the opening 97b. In other words, the supply hole 101 is located above the inner bottom portion 61 of the cylinder bore 35 (L) in the vertical direction in the vehicle mounted state, and is the inner peripheral surface 39 of the cylinder bore 35 (L) and the inner circumference of the supply hole 101. A position where the contact point P is arranged so as to be in contact with the portion of the surface 102 that forms the valley bottom of the female screw 103, and the contact point P is vertically above the opening 97b of the communication hole 97 communicating with the cylinder bore 35 (U) on the upper side in the vertical direction. It is arranged so as to be.

In such a second embodiment, when the brake fluid is injected into the two cylinder bores 35 in the vehicle mounted state, the bleeder plugs (not shown) provided in the bleeder holes 92 are opened from the supply holes 101. Brake fluid will be injected into the cylinder bore 35 (L). Here, although the upper end of the opening 97b on the lower side in the vertical direction of the communication hole 97 is arranged at the upper end of the cylinder bore 35 (L), air may cause an air pool at the upper end of the cylinder bore 35 (L). is there.

On the other hand, the coincident position P of the upper end in the vertical direction between the inner peripheral surface 102 of the supply hole 101 and the inner peripheral surface 39 of the cylinder bore 35 (L) in the radial direction of the cylinder bore 35 (L) is the bleeder hole 92. The brake fluid introduced into the cylinder bore 35 (L) through the inner peripheral surface 102 of the supply hole 101 is located vertically above the lower end of the opening 97b of the communication hole 97 and coincides with the upper end of the opening 97b. It is introduced at the position of the air pool and the air in the air pool is pushed out to the communication hole 97, so that the air pool can be suppressed.

As described above, in the second embodiment, the supply hole 101 overlaps the position of the inner peripheral surface 39 of the cylinder bore 35 (L) in the radial direction of the cylinder bore 35 (L), and the communication hole 97 of the bleeder hole 92. It is arranged at a position above the lower end of the opening 97b to the cylinder bore 35 (L) in the vertical direction. More specifically, the inner peripheral surface 102 of the supply hole 101 coincides with the inner peripheral surface 39 of the cylinder bore 35 (L) in the radial direction of the cylinder bore 35 (L), and the supply hole 101 is vertical. The matching position P, which is the upper end in the direction, coincides with the upper end of the opening 97b of the communication hole 97, and is arranged at a position above the lower end in the vertical direction. As a result, the brake fluid introduced into the cylinder bore 35 (L) through the supply hole 101 can push the air in the air pool to the communication hole 97, and the air pool can be suppressed.

Further, since the supply hole 101 is formed so as to open to the inner bottom portion 61 of the target cylinder bore 35 (L) other than the cylinder bore 35 (U) which is the uppermost portion in the vertical direction among the plurality of cylinder bores 35, the bleeder hole 101 is formed. It is possible to suppress air accumulation in the target cylinder bore 35 (L) far from the mouth of 92.

Further, the bleeder hole 92 has a linear shape as a whole including a communication hole 97 that communicates the target cylinder bore 35 (L) and the upper cylinder bore (U) adjacent to the upper side of the target cylinder bore 35 (L) in the vertical direction. Therefore, since the degree of freedom in layout is low, the effect of suppressing air accumulation at the position of the supply hole 101 is high.

In the second embodiment, the vehicle mounting angle θ of the caliper body 20 is set to 0 degrees, but as shown in FIG. 9, the caliper body 20 has a vehicle mounting angle θ larger than 0 degrees in the X direction. It may be inclined upward. Also in this case, if the upper end position of the supply hole 101 in the vertical direction is located at least above the lower end position of the opening 97b of the communication hole 97 in the vertical direction, the cylinder bore 35 passes through the supply hole 101. The brake fluid introduced in (L) can push the air in the air pool to the communication hole 97, and the air pool can be suppressed.

Further, as shown in FIG. 10, the caliper body 20 may be inclined backward so that the vehicle mounting angle θ is larger than 0 degrees in the direction opposite to the X direction. In this case as well, if the upper end position of the supply hole 101 in the vertical direction is located at least vertically above the lower end position of the opening 97b of the communication hole 97 in the vertical direction, the cylinder bore 35 passes through the supply hole 101. The brake fluid introduced in (L) can push the air in the air pool to the communication hole 97, and the air pool can be suppressed.

The first aspect of the embodiment described above is a carrier that movably supports a pair of pads arranged on both sides of the disc and is fixed to a non-rotating portion of the vehicle, and a carrier that is movably provided on the carrier. A disc brake having a caliper arranged so as to straddle the disc, and the caliper is formed with a cylinder bore in which a piston for pressing one of the pair of pads is slidably accommodated. In the caliper, a supply hole for supplying the brake fluid is formed so as to communicate with the cylinder bore, and the supply hole is provided at a position on the upper side of the inner bottom portion of the cylinder bore in the vertical direction and the cylinder bore. The position overlaps with the inner peripheral surface of the cylinder bore in the radial direction of the cylinder bore, and is arranged at a position vertically above the opening of the through hole extending vertically upward of the cylinder bore to the cylinder bore. As a result, the brake fluid introduced into the cylinder bore through the supply hole can push the air in the air pool to the bleeder hole, and the air pool can be suppressed.

In the second aspect, in the first aspect, the caliper is formed with a plurality of the cylinder bores arranged in the rotation direction of the disc, and the supply hole is the uppermost portion of the plurality of cylinder bores in the vertical direction. It is formed so as to open to the inner bottom of the target cylinder bore other than the cylinder bore. This makes it possible to suppress air accumulation in the target cylinder bore far from the mouth of the bleeder hole.

Further, in the third aspect, in the second aspect, the bleeder hole is generally linear including a communication hole that communicates the target cylinder bore and the upper cylinder bore adjacent to the upper side in the vertical direction of the target cylinder bore. None, the supply hole is arranged at a position vertically above the opening of the communication hole to the target cylinder bore. As a result, the degree of freedom in the layout of the bleeder hole is low, so that the effect of suppressing air accumulation at the position of the supply hole is high.

Further, in the fourth aspect, a pair of pads arranged on both sides of the disc are movably supported, and the carrier fixed to the non-rotating portion of the vehicle and the carrier movably provided on the carrier straddle the disc. A disc brake having a caliper to be arranged, the caliper is provided with two cylinder portions arranged side by side in the rotation direction of the disc, and the two cylinder portions are provided with one of the pair of pads. A cylinder bore is formed in which the piston that presses one of the pads is slidably accommodated, and the brake fluid is supplied to the lower cylinder portion of the two cylinder portions that is vertically lower when mounted on the vehicle. A supply hole is formed so as to communicate with the cylinder bore, and the supply hole is located on the upper side of the inner bottom portion of the cylinder bore in the vertical direction, and is an inner peripheral surface of the cylinder bore and an inner peripheral surface of the supply hole. The contacts are arranged so as to be in contact with each other, and the contact points are arranged so as to be on the upper side in the vertical direction with respect to the opening of the communication hole communicating with the cylinder bore on the upper side in the vertical direction. As a result, the brake fluid introduced into the cylinder bore through the supply hole can push the air in the air pool to the bleeder hole, and the air pool can be suppressed.

10 Disc brake 11 Disc 12 Carrier 13,14 Pad 15 Caliper 21 Piston 26 Cylinder part 35 Cylinder bore 39 Inner peripheral surface of cylinder bore 61 Inner bottom 92 Breeder hole 96a, 97b Opening 97 Communication hole 101 Supply hole 102 Inner peripheral surface of supply hole

Claims (4)

A carrier that movably supports a pair of pads placed on both sides of the disc and is fixed to the non-rotating part of the vehicle.
It has a caliper that is movably provided on the carrier and is arranged across the disc.
The caliper is a disc brake having a cylinder bore in which a piston that presses one of the pair of pads is slidably accommodated.
In the caliper, a supply hole for supplying the brake fluid is formed so as to communicate with the cylinder bore.
The supply hole is provided at a position on the upper side in the vertical direction of the inner bottom portion of the cylinder bore, and is also provided.
The positions overlap with the inner peripheral surface of the cylinder bore in the radial direction of the cylinder bore.
A disc brake arranged at a position vertically above the opening of a through hole extending vertically upward of the cylinder bore to the cylinder bore. The caliper is formed with a plurality of cylinder bores arranged in the direction of rotation of the disc.
The supply hole is formed so as to open to the inner bottom portion of the target cylinder bore other than the cylinder bore which is the uppermost portion in the vertical direction among the plurality of cylinder bores .
The vertical direction and the cylinder bore to be uppermost, said the target cylinder bores that have been communicating hole formed which communicates Disc brake according to claim 1, wherein. Hole extending in the vertical direction upper side of the cylinder bore to be the vertical direction the top is in the form a generally straight comprise pre Killen hole,
The disc brake according to claim 2, wherein the supply hole is arranged at a position vertically above the opening of the communication hole to the target cylinder bore. A carrier that movably supports a pair of pads placed on both sides of the disc and is fixed to the non-rotating part of the vehicle.
A disc brake having a caliper movably provided on the carrier and arranged across the disc.
The caliper is provided with two cylinders arranged side by side in the direction of rotation of the disc.
The two cylinder portions are formed with cylinder bores in which a piston that presses one of the pair of pads is slidably accommodated.
A supply hole for supplying brake fluid is formed in the lower cylinder portion of the two cylinder portions, which is on the lower side in the vertical direction when mounted on the vehicle, so as to communicate with the cylinder bore.
The supply hole is provided at a position on the upper side in the vertical direction of the inner bottom portion of the cylinder bore of the lower cylinder portion .
It is arranged so that the inner peripheral surface of the cylinder bore of the lower cylinder portion and the inner peripheral surface of the supply hole are in contact with each other.
A disc brake in which the contact point is arranged so as to be vertically above the opening of a communication hole communicating with the cylinder bore of the upper cylinder portion on the upper side in the vertical direction of the cylinder bore of the lower cylinder portion .

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