JP7241922B2 - disc brake - Google Patents

Description

The present invention relates to disc brakes for braking vehicles such as two-wheeled vehicles and four-wheeled vehicles.
This application claims priority based on Japanese Patent Application No. 2019-233896 filed in Japan on December 25, 2019, the content of which is incorporated herein.

Some disc brakes have a structure in which a caliper body is provided with a space opening in the radial direction of the rotor and a pad is arranged in this space (see, for example, Patent Document 1 below).

Japanese Patent Application Laid-Open No. 2014-173623

There is a demand for miniaturization in disc brakes.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a disk brake that can be downsized.

In order to achieve the above objects, the present invention employs the following aspects.
A disc brake according to a first aspect includes a pair of pads for pressing a disc rotor; a pad assembly space arranged across the disc rotor and open in the radial direction of the rotor; and a pad assembly space. a caliper body having a pair of pad sliding portions that slidably support the pair of pads in the rotor axial direction on both sides in the rotor axial direction; The total length of either one of the pad sliding portions and the pad assembly space is shorter than the thickness of two pads, and one of the pair of pad sliding portions is located on the disk rotor side. When one pad is placed at the end position of the other of the pair of pad sliding portions in the direction away from the disk rotor, the gap between the pad and the pad is one pad. is provided at a position longer than the thickness of the

A disc brake according to a second aspect comprises a pair of pads for pressing a disc rotor; a pad assembly space arranged across the disc rotor and open in the radial direction of the rotor; and a pad assembly space. a caliper body having a pair of pad sliding portions that slidably support the pair of pads in the rotor axial direction on both sides in the rotor axial direction; The total length of either one of the pad sliding portions and the pad assembly space is shorter than the thickness of two pads, and one of the pair of pad sliding portions is located on the disk rotor side. When one of the pads is placed at the end position of the other of the pair of pad sliding portions in the direction away from the disk rotor, the distance from the pad is one pad. is provided at a position longer than the thickness of the

According to the disc brake according to each aspect of the present invention, it is possible to reduce the size of the disc brake.

It is a top view showing a disc brake concerning one embodiment of the present invention. It is the figure which looked at the disc brake of the same embodiment from arrow II of FIG. It is the figure which looked at the disc brake of the same embodiment from arrow III of FIG. It is a bottom view showing the disc brake of the same embodiment. FIG. 2 is a cross-sectional view of the disc brake of the same embodiment as viewed along line VV in FIG. 1; It is the figure which looked at the disc brake of the same embodiment from arrow VI of FIG. It is the figure which looked at the disc brake of the same embodiment from the arrow VII of FIG. It is a top view which shows the relationship between a pad and the principal part of a caliper main body of the disc brake of the same embodiment. It is a top view which shows the relationship between a pad and the principal part of a caliper main body of the disc brake of the same embodiment. It is a top view which shows the relationship between a pad and the principal part of a caliper main body of the disc brake of the same embodiment.

An embodiment according to the present invention will be described based on the drawings.
The disc brake 10 of this embodiment is an opposed-piston type disc brake used for braking the front wheels of a motorcycle. The present invention is, of course, applicable not only to this, but also to, for example, a disc brake for braking the rear wheels of a motorcycle or a four-wheeled vehicle.

As shown in FIGS. 1 to 7, the disc brake 10 of this embodiment includes a caliper 12 that imparts frictional resistance to a disc-shaped disc rotor 11 that rotates together with a wheel (not shown) to be braked. The caliper 12 is attached to the vehicle body side.

In the following description, the radial direction of the disk rotor 11 will be referred to as the rotor radial direction, the central axis of the disk rotor 11 will be referred to as the rotor axis, and the extending direction of the rotor axis will be referred to as the rotor axial direction. The rotation direction (circumferential direction) is called the rotor rotation direction. Further, the inlet side of the disk rotor 11 in the rotational direction R when the vehicle moves forward is called the rotor turning-in side, and the outlet side is called the rotor turning-out side. Further, the center side of the disk rotor 11 in the rotor radial direction is called the inner side in the rotor radial direction, and the side opposite to the center of the disk rotor 11 is called the outer side in the rotor radial direction. In addition, the side opposite to the wheel in the axial direction of the rotor (the outer side in the vehicle width direction) is called the outer side, and the side of the wheel (the inner side in the vehicle width direction) is called the inner side.

The caliper 12 includes a caliper main body 15 arranged across the outer peripheral side of the disc rotor 11 and fixed to the vehicle body, and a pair of pistons 16 having the same shape as shown in FIG. , and a pair of pistons 17 that are housed in the caliper body 15 and have the same shape. The pistons 16 and 17 have the same shape. The pair of pistons 16 and the pair of pistons 17 have their center axes along the rotor axis direction, and are all arranged at positions equidistant from the rotor axis. A line passing through the rotor axis of the disc rotor 11 and the center of the caliper body 15 in the rotor rotation direction and extending in the rotor radial direction is referred to as a radial reference line. The extending direction of this radial reference line is referred to as the reference line direction. The radial reference line is orthogonal to the rotor axis. The caliper body 15 has a mirror-symmetrical shape with respect to a plane including the rotor axis and the radial reference line.

A pair of pistons 16 are provided in the caliper 12 on both sides in the rotor axial direction with respect to the disk rotor 11 in alignment with each other in the rotor radial direction and the rotor rotational direction. In the caliper 12, a pair of pistons 17 are provided on both sides of the disk rotor 11 in the rotor axial direction so as to align with each other in the rotor radial direction and the rotor rotational direction. The pair of pistons 16 are provided closer to the disk exit side than the pair of pistons 17 . The pair of pistons 16 and the pair of pistons 17 are arranged at equidistant positions from the center of the caliper body 15 in the rotor rotation direction, in other words, at equidistant positions from the radial reference line.

The caliper 12 is provided on one side of the disk rotor 11 in the axial direction of the rotor, with one piston 16 and one piston 17 arranged side by side with a predetermined spacing in the rotor rotation direction. Such structures are provided on both sides in the axial direction of the rotor so as to face each other. Therefore, the caliper 12 is an opposed piston type four-pot caliper. It should be noted that at least one pair of pistons sandwiching the disc rotor 11 is sufficient, and instead of the two pairs described above, three or four pairs may be used. Furthermore, the number of pistons may be different between both sides of the disk rotor 11 in the rotor axial direction, such as a combination of one and two, or a combination of two and three. Also, the diameters of the pistons may be different between the rotor turn-in side and the rotor turn-out side.

As shown in FIG. 1, the caliper body 15 includes an outer cylinder portion 21 arranged on the outer side of the disk rotor 11 in the axial direction of the rotor, an inner cylinder portion 22 arranged on the inner side of the disk rotor 11, A turn-out side connecting portion 23 that connects end portions of the outer side cylinder portion 21 and the inner side cylinder portion 22 on the rotor turn-out side, and each of the outer side cylinder portion 21 and the inner side cylinder portion 22 on the rotor turn-in side. It has a turn-in side connecting portion 24 that connects end portions together, and an intermediate connecting portion 25 that connects intermediate portions of the outer side cylinder portion 21 and the inner side cylinder portion 22 in the rotor rotation direction.
The output side connecting portion 23, the input side connecting portion 24, and the intermediate connecting portion 25 are all arranged to straddle the disk rotor 11 on the outer side in the rotor radial direction. In other words, the caliper main body 15 straddles the disk rotor 11 at the end portions of the pair of the outer side cylinder portion 21 and the inner side cylinder portion 22 in the rotor rotation direction to connect the outer side cylinder portion 21 and the inner side cylinder portion 22 . A pair of outflow side connecting portion 23 and a turn in side connecting portion 24; and a pair of outer side cylinder portions straddling the disc rotor 11 at an intermediate portion in the rotor rotation direction of the pair of outer side cylinder portion 21 and inner side cylinder portion 22. 21 and an intermediate connecting portion 25 that connects the inner side cylinder portion 22;

The caliper main body 15 is a monoblock caliper in which the outer side cylinder portion 21, the inner side cylinder portion 22, the output side connecting portion 23, the input side connecting portion 24, and the intermediate connecting portion 25 are integrally cast. Therefore, the outer side cylinder portion 21 and the inner side cylinder portion 22 are integrally formed via the outlet side connecting portion 23 , the inlet side connecting portion 24 and the intermediate connecting portion 25 .

As shown in FIGS. 6 and 7 , the outer side cylinder portion 21 is arranged to face the outer side surface of the disc rotor 11 . As shown in FIGS. 1, 3, and 4, the outer side cylinder portion 21 includes a mounting boss portion 34 disposed on the side of the output side connecting portion 23, which is one end in the rotor rotation direction, and the other end in the rotor rotation direction. and a mounting boss portion 35 disposed on the side of the insertion side connecting portion 24 .

As shown in FIG. 2, the outer side cylinder portion 21 has a long shape along the rotor rotation direction in order to accommodate the plurality of pistons 16 and 17 side by side in the rotor rotation direction. Two cylinder bores 38 and 39 for accommodating the pistons 16 and 17 movably along the rotor axial direction are formed in the outer side cylinder portion 21 side by side in the rotor rotation direction.

The cylinder bores 38 and 39 have the same diameter and are formed along the rotor axial direction. The cylinder bores 38, 39 are arranged such that the cylinder bore 38 accommodating the piston 16 is arranged on the output side coupling portion 23 side in the rotor rotation direction, and the cylinder bore 39 accommodating the piston 17 is arranged on the intake side coupling portion 24 side in the rotor rotation direction. It is The cylinder bores 38 and 39 are open on the disk rotor 11 side and closed on the side opposite to the disk rotor 11 in the rotor axial direction. The cylinder bores 38 and 39 are arranged at equidistant positions from the center of the caliper body 15 in the rotor rotation direction, in other words, at equidistant positions from the radial reference line.

As shown in FIG. 1, a supply/discharge port 41 is formed at the center position of the outer side cylinder portion 21 in the rotor rotation direction. The supply/discharge port 41 supplies/discharges the brake fluid to/from the cylinder bores 38 and 39 shown in FIG. The supply/discharge port 41 is formed parallel to the radial reference line.

A mount hole 44 is formed through the mounting boss portion 34 in the rotor radial direction. A mount hole 45 is formed through the mounting boss portion 35 in the rotor radial direction. These mounting holes 44 and 45 are parallel to the radial reference line, and are equidistant from the center of the caliper body 15 in the rotor rotation direction, in other words, equidistant from the radial reference line. It is formed by matching the position of the direction. The caliper 12 is of a so-called radial mount type, which is fixed to the vehicle body side with mounting bolts (not shown) inserted through these mount holes 44 and 45 .

A bleeder boss portion 49 to which a bleeder plug 48 for bleeding air is attached is formed in the outlet side connecting portion 23 . The caliper main body 15 is arranged behind the disc rotor 11 in the vehicle front-rear direction, with the output side connecting portion 23 having the bleeder boss portion 49 formed thereon being arranged vertically upward. Therefore, when the vehicle is traveling forward, the disc rotor 11 moves vertically from the bottom to the top with respect to the caliper body 15 .

As shown in FIGS. 6 and 7 , the inner side cylinder portion 22 is arranged to face the inner side surface of the disk rotor 11 . As shown in FIG. 3, the inner side cylinder portion 22 has a long shape along the rotor rotation direction in order to accommodate the plurality of pistons 16 and 17 side by side in the rotor rotation direction. Two cylinder bores 58 and 59 are formed side by side in the rotor rotation direction in the inner side cylinder portion 22 to house the pistons 16 and 17 so as to be movable in the axial direction of the rotor.

A cylinder bore 58 that accommodates the piston 16 is arranged on the output side connecting portion 23 side in the rotor rotation direction. A cylinder bore 59 that accommodates the piston 17 is arranged on the inlet-side connecting portion 24 side in the rotor rotation direction. The cylinder bores 58 and 59 are open on the disk rotor 11 side in the rotor axial direction, and are closed on the side opposite to the disk rotor 11 . The cylinder bores 58 and 59 are arranged at equidistant positions from the center of the caliper body 15 in the rotor rotation direction, in other words, at equidistant positions from the radial reference line. In addition to the cylinder bores 38 and 39 of the outer side cylinder portion 21 shown in FIG. 2, the supply/discharge port 41 of the outer side cylinder portion 21 shown in FIG. supply and drain the brake fluid.

The caliper body 15 has an outer side cylinder portion 21 shown in FIGS. 1, 2, 4 and 6 and an inner side cylinder portion 22 shown in FIGS. and are arranged opposite to each other in the rotor axial direction with their positions in the rotor radial direction overlapping each other. The cylinder bore 38 shown in FIG. 2 is formed coaxially with the cylinder bore 58 shown in FIG. The cylinder bore 39 shown in FIG. 2 is formed coaxially with the cylinder bore 59 shown in FIG.

As shown in FIG. 1, the output side connecting portion 23 has a pad sliding portion 32A, a pad sliding portion 33B, and a support connecting portion 51 on the side of the incoming side connecting portion 24 in the rotor rotation direction. . The pad sliding portion 32A is arranged on the outer side of the disc rotor 11 . The pad sliding portion 33B is arranged on the inner side of the disc rotor 11 . The support connecting portion 51 is provided between the pad sliding portion 32A and the pad sliding portion 33B so as to connect them. The pad sliding portion 32A and the pad sliding portion 33B have mirror-symmetrical shapes.

The inlet side connecting portion 24 has a pad sliding portion 32B and a pad sliding portion 33A on the side of the outlet side connecting portion 23 in the rotor rotation direction. The pad sliding portion 33A is arranged on the outer side of the disc rotor 11 . The pad sliding portion 32B is arranged on the inner side of the disc rotor 11 . The pad sliding portion 33A and the pad sliding portion 32B are mirror-symmetrical. The caliper body 15 has a pad assembly space 52 penetrating in the rotor radial direction between the pad sliding portion 33A and the pad sliding portion 33B. The pad assembly space 52 is open to the outer and inner sides in the rotor radial direction and to the rotor run-out side. In other words, the caliper body 15 has a pair of pad sliding portions 33A and 32B on both sides of the pad assembly space 52 in the rotor axial direction.

The output side connecting portion 23 has pad sliding portions 32A and 33B on both sides of the disk rotor 11 in the rotor axial direction. The entry-side connecting portion 24 has pad sliding portions 32B and 33A on both sides of the disk rotor 11 in the rotor axial direction. In other words, four pad sliding portions 32A, 33B, 32B, and 33A are provided in the outflow side connecting portion 23 and the inflow side connecting portion 24, respectively. Further, the output-side connecting portion 23 has a support connecting portion 51 that overlaps the position of the disk rotor 11 in the rotor axial direction. The entry-side connecting portion 24 has a pad assembly space 52 that overlaps with the disk rotor 11 in the axial direction of the rotor. In the caliper main body 15, the pad sliding portions 32A and 33B and the support connection portion 51 are arranged on the rotor run-out side with respect to the pad sliding portions 32B and 33A.

The pad sliding portion 32A, the support connection portion 51, and the pad sliding portion 33B overlap each other in the rotor rotation direction and the rotor radial direction, and are continuous in the rotor axial direction. The pad sliding portion 33A and the pad sliding portion 32B are opposed to each other in the rotor axial direction with their positions in the rotor rotation direction and the rotor radial direction overlapping each other. As shown in FIG. 4, the disc rotor 11 is arranged between the pad sliding portions 32A and 33A and the pad sliding portions 32B and 33B. The support connecting portion 51 connects the pad sliding portion 32A and the pad sliding portion 33B on the outer side of the disk rotor 11 in the rotor radial direction. The pad assembly space 52 is disposed outside the disk rotor 11 in the rotor radial direction between the pad sliding portion 32B and the pad sliding portion 33A.

The caliper main body 15 is surrounded by the outer side cylinder portion 21, the inner side cylinder portion 22, the pad sliding portions 32A, 32B, 33A, and 33B, and the support connection portion 51, and has openings on both sides in the rotor radial direction at substantially the center. A pad arrangement space 61 is formed. The entire pad arrangement space 61 is open to the inner side in the rotor radial direction. As shown in FIG. 1, the intermediate connecting portion 25 is provided at the center position of the caliper body 15 in the rotor rotation direction. The intermediate connecting portion 25 is provided across the pad arrangement space 61 in the rotor radial direction outside thereof in the rotor axial direction. Therefore, the outer side of the pad arrangement space 61 in the rotor radial direction includes the pad sliding portions 32A and 33B on the rotor run-out side and the portion between the support connection portion 51 and the intermediate connection portion 25; A portion between 33A, 32B and the intermediate connecting portion 25 is open.

A pad assembly space 52 between the pad sliding portion 33A and the pad sliding portion 32B opens to the pad arrangement space 61 and is connected to the pad arrangement space 61. As shown in FIG. The pad assembly space 52 has a shape that is recessed from the center of the pad arrangement space 61 in the rotor axial direction toward the rotor rotation entrance side. The cylinder bores 38, 39, 58, 59 shown in FIGS. 2 and 3 open into the pad arrangement space 61 shown in FIG. The disk rotor 11 crosses the center position of the pad arrangement space 61 in the rotor axial direction in the rotor rotation direction.

Here, in the caliper body 15, the outer side cylinder portion 21, the inner side cylinder portion 22, the outlet side connecting portion 23, the inlet side connecting portion 24, and the intermediate connecting portion 25 shown in FIG. The cylinder portion 22 is integrally formed by casting except for the bottom portions of the cylinder bores 58 and 59 . Then, the inner surfaces of the cylinder bores 38 , 39 , 58 , 59 are machined through the cast openings at the bottoms of these two cylinder bores 58 , 59 of the inner side cylinder portion 22 . Thereafter, a separate closing member is joined to the openings of the bottoms of the cylinder bores 58 and 59 of the inner side cylinder portion 22 by friction stir welding to close the openings and form the bottoms, thereby forming the caliper body 15. be done. The outer side cylinder portion 21, the inner side cylinder portion 22, the outflow side connection portion 23, the inflow side connection portion 24, and the intermediate connection portion 25 are all integrally formed by casting. The inner surfaces of the cylinder bores 38 , 39 , 58 , 59 may be cut from the pad arrangement space 61 between the inner side cylinder portions 22 .

As shown in FIG. 5, the pad sliding portion 32B on the inner side of the inlet side connecting portion 24 includes a torque receiving surface 71B facing the pad arrangement space 61, a rotor facing surface 72B facing the disk rotor 11, A locking surface portion 73B is formed facing the radially outer side of the rotor and toward the output side of the rotor. The torque receiving surface 71B is a flat surface extending parallel to the radial reference line, and also extending parallel to the rotor axis. The torque receiving surface 71B forms the pad arrangement space 61. As shown in FIG. The rotor facing surface 72B forms the pad assembly space 52 . The rotor facing surface 72B extends perpendicularly to the rotor axis. The locking surface portion 73B is a flat surface extending parallel to the rotor axis, and is inclined away from the radial reference line toward the outer side in the rotor radial direction in the reference line direction. The locking surface portion 73B and the torque receiving surface 71B intersect at an obtuse angle.

A wall surface portion 74B that rises from the inner side edge portion of the locking surface portion 73B outward in the rotor radial direction and on the rotor exit side is formed in the inlet side connecting portion 24 . The wall surface portion 74B extends substantially perpendicular to the rotor axis.

The support connection portion 51 of the output-side connection portion 23 is formed with a locking surface portion 53 facing radially outward of the rotor and toward the rotor rotation-in side. The locking surface portion 53 is a flat surface extending parallel to the rotor axis, and is inclined away from the radial reference line toward the outer side in the rotor radial direction in the reference line direction.

As shown in FIG. 4, the pad sliding portion 33B on the inner side of the output side connecting portion 23 has a torque receiving surface 81B facing toward the pad arrangement space 61 and a rotor facing surface 82B facing toward the disk rotor 11. formed. Further, as shown in FIG. 1, the pad sliding portion 33B is formed with a locking surface portion 83B facing outward in the rotor radial direction. The torque receiving surface 81B shown in FIG. 5 is a flat surface extending parallel to the radial reference line and also extending parallel to the rotor axis. The torque receiving surface 81B forms the pad arrangement space 61. As shown in FIG. The locking surface portion 83B shown in FIG. 1 is arranged on the same plane as the locking surface portion 53 of the support connecting portion 51 . Therefore, the locking surface portion 83B is also a flat surface that spreads parallel to the rotor axis, faces the rotor radial direction outer side and the rotor rotation side, and moves away from the radial direction reference line toward the rotor radial direction outer side in the reference line direction. Inclined. The locking surface portion 83B and the torque receiving surface 81B intersect at an obtuse angle. This intersection angle is equivalent to the angle formed by the locking surface portion 73B and the torque receiving surface 71B.

A wall surface portion 84B that rises outward in the rotor radial direction from the inner side edge portion of the locking surface portion 83B is formed in the outlet side connecting portion 23 . The wall surface portion 84B extends substantially perpendicular to the rotor axis.

The caliper body 15 is formed with an intermediate wall surface portion 86B facing the pad arrangement space 61 side between the inner-side pad sliding portions 32B and 33B. The intermediate wall surface portion 86B has a planar shape that extends perpendicularly to the rotor axis and forms the pad arrangement space 61 .

The pad sliding portion 33A on the outer side of the entry-side connecting portion 24 has a torque receiving surface 81A facing the pad arrangement space 61, a rotor facing surface 82A facing the disc rotor 11, and a rotor radially outward facing surface 82A. A locking surface portion 83A is formed.
The torque receiving surface 81A is a flat surface extending parallel to the radial reference line, and also extending parallel to the rotor axis. The torque receiving surface 81A forms a pad arrangement space 61. As shown in FIG. The rotor facing surface 82A forms the pad assembly space 52. As shown in FIG. The torque receiving surface 81A is arranged on the same plane as the torque receiving surface 71B. The rotor facing surface 82A extends perpendicularly to the rotor axis. The locking surface portion 83A is a flat surface that extends parallel to the rotor axis and is arranged on the same plane as the locking surface portion 73B. Therefore, the locking surface portion 83A is also oriented toward the rotor radial direction outer side and the rotor run-out side, and is inclined away from the radial direction reference line toward the rotor radial direction outer side in the direction of the reference line. The locking surface portion 83A and the torque receiving surface 81A intersect at an obtuse angle. This intersection angle is equivalent to the angle formed by the locking surface portion 73B and the torque receiving surface 71B.

A wall surface portion 84A that rises outward in the rotor radial direction from the outer edge of the locking surface portion 83A and on the rotor exit side is formed in the inlet side connecting portion 24 . The wall surface portion 84A extends substantially perpendicular to the rotor axis and faces the wall surface portion 74B.

The rotor facing surface 82A and the rotor facing surface 72B are aligned in the rotor radial direction and the rotor rotational direction and face each other in the rotor axial direction. The entry-side connecting portion 24 has an intermediate surface 88 that forms the pad assembly space 52 between the rotor facing surface 82A and the rotor facing surface 72B. The intermediate surface 88 is a flat surface extending parallel to the radial reference line and also extending parallel to the rotor axis.

As shown in FIG. 4, the pad sliding portion 32A on the outer side of the output side connecting portion 23 has a torque receiving surface 71A facing the pad arrangement space 61 and a rotor facing surface 72A facing the disk rotor 11. formed. Further, as shown in FIG. 1, the pad sliding portion 32A is formed with a locking surface portion 73A facing outward in the rotor radial direction. The torque receiving surface 71A is a flat surface extending parallel to the radial reference line, and also extending parallel to the rotor axis. The torque receiving surface 71A is arranged on the same plane as the torque receiving surface 81B. The torque receiving surface 71A forms a pad arrangement space 61. As shown in FIG. The locking surface portion 73A is arranged on the same plane as the locking surface portion 53 and the locking surface portion 83B. Therefore, the locking surface portion 73A is a flat surface extending parallel to the rotor axis. The locking surface portion 73A faces toward the rotor radial direction outer side and the rotor turning-in side, and is inclined away from the radial direction reference line toward the rotor radial direction outer side in the direction of the reference line. The locking surface portion 73A and the torque receiving surface 71A intersect at an obtuse angle. This crossing angle is the same angle as the angle formed by the locking surface portion 73B and the torque receiving surface 71B.

A wall surface portion 74A is formed in the output-side connecting portion 23 so as to rise from an outer-side edge portion of the locking surface portion 73A outward in the rotor radial direction and on the rotor rotation-in side. The wall surface portion 74A extends substantially perpendicular to the rotor axis and faces the wall surface portion 84B.

The caliper body 15 has an intermediate wall surface portion 86A facing the pad arrangement space 61 side between the pad sliding portions 32A and 33A on the outer side. The intermediate wall surface portion 86A has a planar shape extending perpendicularly to the rotor axis, and forms the pad arrangement space 61. As shown in FIG. The intermediate wall surface portion 86A is aligned with the intermediate wall surface portion 86B in the rotor radial direction and the rotor rotational direction, and faces each other in the rotor axial direction.

A pad spring 101 is attached to the caliper body 15 so as to be engaged with the intermediate connecting portion 25 . The caliper body 15 supports a pair of pads 102 having the same shape with the pad springs 101 . These pads 102 are arranged to face the disk rotor 11 . One pad 102 is arranged between the outer side cylinder portion 21 and the disc rotor 11 . The other pad 102 is arranged between the inner side cylinder portion 22 and the disc rotor 11 .

The pad spring 101 is formed by stamping and bending a plate material of a certain thickness by press molding. The pad spring 101 includes a base plate portion 111, an engaging plate portion 112, an engaging plate portion 113 shown in FIG. , a connecting plate portion 118 , and a connecting plate portion 119 .
The substrate portion 111 shown in FIG. 5 is arranged between the intermediate connecting portion 25 and the pair of pads 102 and is in contact with the intermediate connecting portion 25 . The engaging plate portion 112 extends outward in the rotor radial direction from the edge portion of the substrate portion 111 on the rotor run-out side and engages with the intermediate connecting portion 25 . The engaging plate portion 113 extends outward in the rotor radial direction from the edge of the substrate portion 111 on the rotor entry side and engages with the intermediate connecting portion 25 . As a result, the engaging plate portions 112 and 113 sandwich the intermediate connecting portion 25 . As a result, the pad spring 101 is attached to the caliper body 15 .

The pair of extending plate portions 114 and 115 on the rotor run-out side shown in FIG. 1 extend from the edge portion on the rotor run-out side of the substrate portion 111 shown in FIG. 5 toward the rotor run-out side. As shown in FIG. 1, the connecting plate portion 118 connects the distal end portions of the extending plate portions 114 and 115 on the rotor run-out side. The extending plate portions 114 and 115 are arranged on both sides of the engaging plate portion 112 in the rotor axial direction. As shown in FIG. 5, the extending plate portions 114 and 115 and the connecting plate portion 118 are bent so that the rotor run-out side protrudes inward in the rotor radial direction.

The pair of extending plate portions 116 and 117 on the rotor entry side shown in FIG. 1 extend from the edge portion on the rotor entry side of the substrate portion 111 shown in FIG. 5 toward the rotor entry side. As shown in FIG. 1, the connecting plate portion 119 connects the tip portions of the extension plate portions 116 and 117 on the rotor rotation entry side. The extending plate portions 116 and 117 are arranged on both sides of the engaging plate portion 113 in the rotor axial direction.

In the pad spring 101, the outer extending plate portions 114 and 116 contact the outer pad 102 and press it inward in the rotor radial direction. At this time, the extended plate portion 114 on the rotor run-out side also presses the outer side pad 102 on the rotor run-out side. In the pad spring 101, the inner-side extending plate portions 115 and 117 abut against the inner-side pad 102 and press it inward in the rotor radial direction. At this time, the extended plate portion 115 on the rotor run-out side also presses the inner side pad 102 on the rotor run-out side.

The pair of pads 102 are common parts having the same shape. As shown in FIG. 5, the pad 102 has a back plate 121 elongated in the direction of rotation of the rotor, and a lining material 122 attached to a flat attachment surface 125 on one side of the back plate 121 in the thickness direction. . The pad 102 is biased by the pad spring 101 and supported by the caliper body 15 at the back plate 121, and contacts the disc rotor 11 at the lining material 122 to apply braking force to the vehicle.

As shown in FIG. 4 , the pad 102 is pressed against the pistons 16 and 17 on the planar back surface 126 of the back plate 121 opposite the sticking surface 125 . The pad 102 contacts the disk rotor 11 at a flat tip surface 127 of the lining material 122 located on the opposite side of the back plate 121 . A tip surface 127 of the lining material 122 is a plane parallel to the attachment surface 125 and the back surface 126 of the back plate 121 . As shown in FIG. 5, the lining material 122 has planar side surfaces 128 on both sides in the rotor rotation direction, which are parallel to each other. Sides 128 on both sides are perpendicular to the sticking surface 125 of the back plate 121 .

The back plate 121 has a constant thickness, and includes a main plate portion 130 to which the lining material 122 is attached, and a pair of back plates 121 extending outward in the rotor rotation direction from both ends of the main plate portion 130 in the rotor radial direction outside in the rotor rotation direction. and extending portions 131 and 132 of the . The main plate portion 130 has a substantially rectangular shape that is elongated in the rotor rotation direction. It extends in a direction inclined with respect to the The longitudinal direction of the main plate portion 130 is the longitudinal direction of the back plate 121 and the longitudinal direction of the pad 102 . Therefore, a pair of extending portions 131 and 132 extending in a direction inclined with respect to the longitudinal direction of the pad 102 are formed on the back plate 121 at both ends in the rotor rotation direction and radially outwardly of the rotor. there is In the back plate 121, the outer shape of the main plate portion 130 has a mirror-symmetrical shape, and the extending portions 131 and 132 have a mirror-symmetrical shape.

One extending portion 131 extends away from the main plate portion 130 along the longitudinal direction of the main plate portion 130 from the rotor radial direction outer side at one end portion side of the main plate portion 130 in the rotor rotation direction. One of the extending portions 131 is inclined so that the extending tip side thereof is located on the outer side in the rotor radial direction in the reference line direction.
The other extending portion 132 extends away from the main plate portion 130 along the longitudinal direction of the main plate portion 130 from the other end portion side of the main plate portion 130 in the rotor rotation direction and from the rotor radial direction outer side. The other extending portion 132 is inclined so that the extending distal end thereof is located on the outer side in the rotor radial direction in the reference line direction.

The main plate portion 130 has a side surface portion 141 that is a flat surface extending perpendicularly to the longitudinal direction of the main plate portion 130 on one longitudinal side, which is the root position of the extension portion 131 . The main plate portion 130 also has a side surface portion 142 that is a flat surface extending perpendicularly to the longitudinal direction of the main plate portion 130 on the other longitudinal side, which is the root position of the extension portion 132 . The main plate portion 130 has an outer surface portion 143 that is a curved surface that curves outward in the rotor radial direction so as to protrude outward in the rotor radial direction. Both of the side surface portions 141 and 142 and the outer surface portion 143 are flat surfaces extending in the plate thickness direction of the back plate 121 . The side portions 141 and 142 are parallel to each other and also parallel to the pair of side surfaces 128 of the lining material 122 .

The extending portion 131 extends from between the side surface portion 141 and the outer surface portion 143 . The extending portion 131 has a substantially rhombic shape when the back plate 121 is viewed from the plate thickness direction. The extending portion 131 includes a surface portion 151 on the outer side in the rotor rotation direction, facing inward in the rotor radial direction and outward in the rotor rotational direction, a surface portion 152 on the inner side in the rotor rotational direction, facing outward in the rotor radial direction and inward in the rotor rotational direction, and a surface portion 153 located outside in the rotor radial direction and facing outward in the rotor radial direction. These surface portions 151, 152, and 153 are all flat surfaces extending in the plate thickness direction of the back plate 121 and extending along the rotor axial direction.

The surface portion 151 extends outward in the rotor radial direction and in the rotor rotational direction, obliquely with respect to the longitudinal direction and the reference line direction of the pad 102 , from the outer edge portion side in the rotor radial direction of the side portion 141 . . The surface portion 151 and the side portion 141 form an obtuse angle. The angle formed by the surface portion 151 and the side surface portion 141 is the same as the angle formed between the locking surface portion 73B of the pad sliding portion 32B and the torque receiving surface 71B. The surface portion 152 extends outward in the rotor radial direction and in the rotor rotational direction from the edge portion of the outer surface portion 143 on the side portion 141 side in the rotor rotation direction, obliquely with respect to the longitudinal direction and the reference line direction of the pad 102 . out. The surface portion 152 extends substantially parallel to the surface portion 151 . The surface portion 153 connects the edge portion of the surface portion 151 opposite to the side surface portion 141 and the edge portion of the surface portion 152 opposite to the outer surface portion 143 , and extends perpendicularly to the side surface portion 141 . It has spread. The surface portions 151 and 153 form an acute angle, and the surface portions 152 and 153 form an obtuse angle.

The extending portion 132 extends from between the side portion 142 and the outer surface portion 143 . The extending portion 132 has a substantially rhombic shape when the back plate 121 is viewed from the plate thickness direction. The extending portion 132 includes a surface portion 161 on the outer side in the rotor rotation direction facing the inner side in the rotor radial direction and the outer side in the rotor rotating direction, and a surface portion 162 on the inner side in the rotor rotating direction and facing the outer side in the rotor radial direction and the inner side in the rotor rotating direction. and a surface portion 163 located on the outer side in the rotor radial direction and facing the outer side in the rotor radial direction. These surface portions 161, 162, and 163 are all flat surfaces extending in the plate thickness direction of the back plate 121 and extending along the rotor axial direction.

The surface portion 161 extends outward in the rotor radial direction and in the rotor rotational direction from the outer edge portion side in the rotor radial direction of the side portion 142 at an angle to the longitudinal direction and the reference line direction of the pad 102 . . The surface portion 161 and the side portion 142 form an obtuse angle. The angle between the surface portion 161 and the side surface portion 142 is the same as the angle between the surface portion 151 and the side surface portion 141 . The surface portion 162 extends outward in the rotor radial direction and in the rotor rotation direction from the edge portion of the outer surface portion 143 on the side portion 142 side in the rotor rotation direction, obliquely with respect to the longitudinal direction and the reference line direction of the pad 102 . out. The surface portion 162 extends substantially parallel to the surface portion 161 . The surface portion 163 connects the edge portion of the surface portion 161 opposite to the side surface portion 142 and the edge portion of the surface portion 162 opposite to the outer surface portion 143 . It has spread. The surface portion 161 and the surface portion 163 form an acute angle. The surface portion 162 and the surface portion 163 form an obtuse angle. The surface portion 163 is arranged on the same plane as the surface portion 153 .

As shown in FIG. 1, the lining material 122 is arranged on the outer side of the back plate 121 when the pad 102 is assembled to the inner side of the pad arrangement space 61 of the caliper body 15 . As shown in FIG. 5, the extending portion 131 is supported by the pad sliding portion 32B on the rotor entry side in a posture in which the extending portions 131 and 132 are arranged at the outer end portions in the rotor radial direction. The extending portion 132 is supported by the pad sliding portion 33B on the rotor run-out side.

At this time, in the pad 102 arranged on the inner side, the extension portion 132 arranged on the rotor run-out side contacts the extension plate portion 115 of the pad spring 101 at the surface portion 162, and the extension plate portion At 115, it is pressed radially inward of the rotor and on the rotor run-out side. 1 of the pad sliding portion 33B. Further, as shown in FIG. 5, the extending portion 131 of the pad 102 on the rotor introduction side abuts the extending plate portion 117 of the pad spring 101 at the surface portion 153, and the extending plate portion 117 adjusts the diameter of the rotor. direction will be pushed inward. Further, the extending portion 131 abuts on the locking surface portion 73B of the pad sliding portion 32B at the surface portion 151 .

In a state where the pad 102 arranged on the inner side receives only the urging force of the pad spring 101, the urging force of the pad spring 101 pushes the side surface portion 142 of the main plate portion 130 toward the opposite inner side and the rotor run-out side. is directly brought into contact with the torque receiving surface 81B. In addition, the surface portion 161 of the extension portion 132 is brought into direct surface contact with the locking surface portion 83B (see FIG. 1) on the inner side and the rotor rotation side opposite to the surface portion 161 . Further, as shown in FIG. 5, the surface portion 151 of the extending portion 131 is brought into direct surface contact with the opposing locking surface portion 73B on the inner side and rotor entry side.

In this state, in the caliper body 15, the inner-side pad sliding portion 32B has the locking surface portion 73B that spreads along the extending direction of the extending portion 131 of the inner-side pad 102. As shown in FIG. The extending portion 131 of the inner-side pad 102 is engaged with the inner-side pad sliding portion 32B. Also, in this state, the caliper body 15 has the locking surface portion 83B shown in FIG. Become. The extending portion 132 of the inner pad 102 is engaged with the inner pad sliding portion 33B. In this state, as shown in FIG. 5, the inner pad 102 causes the side surface portion 142 of the main plate portion 130 to abut on the torque receiving surface 81B, and the side surface portion 141 of the main plate portion 130 to the torque receiving surface 81B. 71B is opposed with a slight gap. Furthermore, in this state, the extensions 131 and 132 of the inner pad 102 are arranged outside the outermost circumference of the disc rotor 11 in the rotor radial direction.

As shown in FIG. 1, when the pad 102 is assembled to the outer side of the pad arrangement space 61 of the caliper body 15, the lining material 122 is arranged on the inner side with respect to the back plate 121, and the extending portions 131, 132 is arranged radially outward of the rotor. In this posture, the extending portion 131 is supported by the rotor turn-out side pad sliding portion 32A, and the extending portion 132 is supported by the rotor turn-in side pad sliding portion 33A.

At this time, in the pad 102 arranged on the outer side, the extending portion 131 arranged on the rotor run-out side contacts the extending plate portion 114 of the pad spring 101 at the surface portion 152, and the extending plate portion 114 is pressed radially inward of the rotor and on the rotor run-out side. As a result, the extending portion 131 contacts the locking surface portion 73A of the pad sliding portion 32A at the surface portion 151 (see FIG. 5).
In the pad 102, the extending portion 132 on the rotor turn-in side contacts the extending plate portion 116 of the pad spring 101 at the surface portion 163, and the extending plate portion 116 presses radially inward of the rotor. . As a result, the extending portion 132 contacts the locking surface portion 83A of the pad sliding portion 33A at the surface portion 161 (see FIG. 5).

When the pad 102 arranged on the outer side receives only the biasing force of the pad spring 101, the biasing force of the pad spring 101 pushes the side surface portion 141 (see FIG. 5) of the main plate portion 130 toward the outer side opposite thereto. In addition, it is brought into direct surface contact with the torque receiving surface 71A on the rotor run-out side. As a result, the surface portion 151 (see FIG. 5) of the extending portion 131 is brought into direct surface contact with the opposing locking surface portion 73A on the outer side and on the rotor run-out side, and the surface portion 161 of the extending portion 132 is brought into contact. (see FIG. 5) is brought into direct surface contact with the locking surface portion 83A on the outer side and on the rotor entry side.

In this state, in the caliper body 15, the outer side pad sliding portion 32A has a locking surface portion 73A that spreads along the extending direction of the extending portion 131 of the outer side pad 102. As shown in FIG. The extending portion 131 of the outer pad 102 is engaged with the outer pad sliding portion 32A. Also, in this state, the caliper body 15 has the locking surface portion 83A in which the outer side pad sliding portion 33A extends along the extending direction of the extending portion 132 of the outer side pad 102 . The extending portion 132 of the outer pad 102 is engaged with the outer pad sliding portion 33A. In this state, the outer pad 102 causes the side surface portion 141 (see FIG. 5) of the main plate portion 130 to abut against the torque receiving surface 71A, and the side surface portion 142 (see FIG. 5) of the main plate portion 130 to the torque receiving surface 71A. They are opposed to 81A with a slight gap. Furthermore, in this state, the extensions 131 and 132 of the outer pad 102 are arranged outside the outermost circumference of the disk rotor 11 in the rotor radial direction.

As described above, the pair of pads 102 are slidably locked to one caliper body 15 .

The inner-side pad 102 shown in FIG. 5 is supported by the inner-side pad sliding portions 32B and 33B of the caliper body 15 and moves in the rotor axial direction. At this time, the pad sliding portions 32B and 33B are arranged so that the extension portions 131 and 132 of the inner pad 102 are supported by the locking surface portions 73B arranged on both sides in the rotor rotation direction and the locking surface portion 83B shown in FIG. will be locked. Therefore, in the caliper body 15, the inner pad sliding portions 32B and 33B support the inner pad 102 so as to be slidable in the rotor axial direction.

The outer-side pad 102 shown in FIG. 1 is supported by the outer-side pad sliding portions 32A and 33A of the caliper body 15 and moves in the rotor axial direction. At this time, the pad sliding portions 32A, 33A engage the extending portions 131, 132 of the outer pad 102 with the engaging surface portions 73A, 83A arranged on both sides in the rotor rotation direction. Therefore, in the caliper body 15, the outer pad sliding portions 32A and 33A support the outer pad 102 so as to be slidable in the rotor axial direction.

As described above, the caliper 12 has a so-called pad pinless structure in which the pair of pads 102 are directly supported by the caliper body 15 without having pad pins for supporting the pair of pads 102 .

In the disc brake 10 described above, through the supply/discharge port 41 shown in FIG. Brake fluid is introduced. Then, the pair of pistons 16 and the pair of pistons 17 shown in FIG. 4 are moved toward the disk rotor 11 by the hydraulic pressure of the brake fluid. Then, the two pistons 16 and 17 provided in the outer side cylinder portion 21 press the outer side pad 102 provided between the outer side cylinder portion 21 and the disc rotor 11 to remove the lining material 122. It is pressed against the disk rotor 11 . The two pistons 16 and 17 provided in the inner cylinder portion 22 press the inner pad 102 provided between the inner cylinder portion 22 and the disc rotor 11 to remove the lining material 122 thereof. It is pressed against the disk rotor 11 . As a result, the pair of pads 102 press the disk rotor 11 to generate braking force on the vehicle.

At this time, the pair of pads 102 are engaged with the caliper main body 15 so that their movements in the rotor radial direction and in the rotor rotational direction are restricted by the pad sliding portions 32A, 33A, 32B, and 33B. will move in the direction

As shown in FIG. 1, the inner pad 102 moves while being supported by the inner pad slide portions 32B and 33B at the extending portions 131 and 132 when moving in the rotor axial direction. At this time, the extending portion 132 slides on the surface portion 161 on the locking surface portion 83B of the pad sliding portion 33B, and the extending portion 131 slides on the surface portion 151 on the locking surface portion 73B of the pad sliding portion 32B. During movement in the axial direction of the rotor, the outer pad 102 is engaged with the outer pad sliding portions 32A, 33A at the extending portions 131, 132 and moves. At this time, the extending portion 131 slides on the surface portion 151 on the locking surface portion 73A of the pad sliding portion 32A, and the extending portion 132 slides on the surface portion 161 on the locking surface portion 83A of the pad sliding portion 33A. Thus, the caliper main body 15 including the pad sliding portions 32A, 33A, 32B, 33B locks the pad 102 so as to be movable in the axial direction of the rotor.

During forward braking of the vehicle, both of the pair of pads 102 come into contact with the disk rotor 11 at the lining material 122 and move toward the rotor output side. Then, as shown in FIG. 4, the inner side pad 102 contacts the torque receiving surface 81B of the pad sliding portion 33B on the rotor run-out side at the side surface portion 142 of the back plate 121 . Then, the outer side pad 102 abuts on the side surface portion 141 of the back plate 121 against the torque receiving surface 71A of the pad sliding portion 32A on the rotor run-out side. As a result, the caliper body 15 receives braking torque mainly at the pad sliding portions 32A and 33B.

During reverse braking of the vehicle, both of the pair of pads 102 come into contact with the disk rotor 11 at the lining material 122 and move to the rotor rotation side during reverse. Then, the inner side pad 102 contacts the torque receiving surface 71B of the pad sliding portion 32B at the side surface portion 141 of the back plate 121 . Further, the outer side pad 102 contacts the torque receiving surface 81A of the pad sliding portion 33A at the side surface portion 142 of the back plate 121 . As a result, the caliper body 15 receives braking torque mainly at the pad sliding portions 32B and 33A.

As shown in FIG. 1, the caliper main body 15 is provided with an intermediate connecting portion 25 that straddles an intermediate portion of the pad arrangement space 61 in the rotor rotation direction in the rotor axial direction outside the pad arrangement space 61 in the rotor radial direction. . Therefore, when the pair of pads 102 are assembled to the caliper body 15, they cannot be assembled from the outside in the rotor radial direction because they interfere with each other, and are assembled from the inside in the rotor radial direction. The pad arrangement space 61 and the pad assembly space 52 have a size and a shape that do not allow the two pads 102 to be assembled together into the caliper body 15 . For this reason, the pair of pads 102 are assembled to the caliper body 15 one by one from the inside in the rotor radial direction.

For example, the new outer pad 102 is assembled to the outer pad sliding portions 32A and 33A first, and then the new inner pad 102 is assembled to the inner pad sliding portions 32B and 33B. become. At this time, the extension 132 of the outer pad 102, which is assembled first, is passed through the pad assembly space 52 so that the extensions 131 and 132 move the pad sliding portions 32A and 33A outward in the rotor radial direction. It can be crossed over in the direction and assembled with the pad sliding portions 32A and 33A.

By the way, the caliper main body 15 of this embodiment is miniaturized in the rotor axial direction. Therefore, the pad arrangement space 61 and the pad assembly space 52 are in a state in which the previously attached new outer-side pad 102 is closest to the outer side, in other words, as shown in FIG. Even if the back surface 126 of the back plate 121 of the pad 102 is brought into surface contact with the intermediate wall surface portion 86A, it cannot be assembled to the caliper main body 15. FIG. That is, the inner pad 102 in a new state cannot be assembled to the caliper body 15 in a state in which the tip surface 127 of the inner pad 102 is in surface contact with the tip surface 127 of the outer pad 102 and arranged in parallel with the outer pad 102 . can't FIG. 8 is a view of the vicinity of the pad arrangement space 61 of the caliper body 15 viewed from the outside in the rotor radial direction along the direction of the radial reference line.

That is, the caliper body 15 is assembled with the outer pad 102 in a new state first to the outer pad sliding portions 32A and 33A, and is positioned at the end position closest to the outer side. Even if an attempt is made to move the pad 102 in the radial direction of the rotor while keeping the front end surface 127 of the pad 102 in surface contact with the front end surface 127 of the outer side pad 102, the pad slides forming the pad assembly space 52 and the pad arrangement space 61 will not move. The moving parts 32A, 32B, 33A, 33B and the support connecting part 51 hinder this. Specifically, after the extending portion 132 of the inner-side pad 102 is arranged outside the pad sliding portion 33B and the support connecting portion 51 in the rotor radial direction, the extending portion 131 is moved into the pad assembly space 52. 8, the extension 131 overlaps the pad sliding portion 32B in the rotor rotation direction and the rotor axial direction and interferes with the pad sliding portion 32B. end up Therefore, the extending portion 131 cannot cross the pad sliding portion 32B in the rotor radial direction.

Conversely, the new inner pad 102 is assembled to the inner pad sliding portions 32B and 33B first, and then the new outer pad 102 is attached to the outer pad sliding portion. The same is true when assembling to 32A and 33A. That is, the pad arrangement space 61 and the pad assembly space 52 are arranged so that the inner pad 102 in a new state is attached to the inner pad sliding portions 32B and 33B, and the inner pad 102 is positioned closest to the inner side. In other words, even if the back surface 126 of the back plate 121 of the inner pad 102 is in surface contact with the intermediate wall surface portion 86B, it cannot be assembled to the caliper body 15. That is, the outer pad 102 in a new state cannot be assembled to the caliper main body 15 in a state in which the tip surface 127 of the outer pad 102 is in surface contact with the tip surface 127 of the inner pad 102 and arranged in parallel with the inner pad 102 . can't

That is, the caliper body 15 is assembled with the inner pad 102 in a new state first to the inner pad sliding portions 32B and 33B, and positioned at the end position closest to the inner side. Even if an attempt is made to move the pad 102 in the radial direction of the rotor while keeping the front end surface 127 of the pad 102 in surface contact with the front end surface 127 of the inner pad 102, the pad slides that form the pad assembly space 52 and the pad arrangement space 61 will not move. The moving parts 32A, 32B, 33A, 33B and the support connecting part 51 hinder this. Specifically, after the extending portion 131 of the outer pad 102 is arranged outside the pad sliding portion 32A and the support connecting portion 51 in the rotor radial direction, the extending portion 132 is moved into the pad assembly space 52. Even if an attempt is made to cross the pad sliding portion 33A in the rotor radial direction, the extending portion 132 overlaps and interferes with the pad sliding portion 33A in the rotor rotation direction and the rotor axial direction. Therefore, the pad sliding portion 33A cannot be crossed in the rotor radial direction.

This relationship will be further explained. The distance between the rear surface 126 of the back plate 121 and the tip surface 127 of the lining material 122 in the new state of the outer pad 102 is defined as the new thickness Pt1. The new thickness Pt1 is the maximum thickness of the pad 102 when it is new. In addition, the distance between the back surface 126 of the back plate 121 and the tip surface 127 of the lining material 122 in the new state of the inner pad 102 is defined as the new thickness Pt2. The new thickness Pt2 is also the maximum thickness of the pad 102 when it is new. Since the pair of pads 102 are common parts, Pt1=Pt2 and Pt1=Pt2=Pt.

A rotor axial width Ci is defined as the distance between the rotor facing surface 72B of the pad sliding portion 32B on the rotor inlet side and the inner side and the intermediate wall surface portion 86B. Let Co be the distance between the rotor facing surface 82A of the pad sliding portion 33A on the rotor inlet side and the outer side and the intermediate wall surface portion 86A. Let Csx be the distance between the rotor facing surface 72B and the rotor facing surface 82A. Since the pad sliding portion 32B and the pad sliding portion 33A are mirror-symmetrical, Co=Ci.

Then, as shown in FIG. 8, in the axial direction of the rotor, the total distance Co+Csx between the outer-side pad sliding portion 33A and the pad assembly space 52 is larger than the thickness of two pads 102, 2×Pt. It's getting smaller. That is, the relationship is 2×Pt>Co+Csx.

Similarly, in the axial direction of the rotor, the total distance Ci+Csx between the inner-side pad sliding portion 32B and the pad assembly space 52 is smaller than the thickness of two pads 102, 2×Pt. That is, the relationship is 2×Pt>Ci+Csx.

In other words, in the axial direction of the rotor, the distance between either one of the outer pad sliding portion 33A and the inner pad sliding portion 32B and the pad assembly space 52 is equal to the length of the pad 102. It has a dimensional relationship shorter than the thickness of a minute.

Therefore, in the present embodiment, for example, as shown in FIG. 9, the outer pad 102 in a new state is first assembled to the outer pad sliding portions 32A and 33A. After that, when the new inner pad 102 is assembled to the inner pad sliding portions 32B and 33B, the outer pad 102 is moved to the outermost side. The back surface 126 of the back plate 121 is in surface contact with the intermediate wall surface portion 86A. In addition, if the new inner pad 102 is slanted with respect to the outer pad 102 , the extending portion 131 can pass through the pad assembly space 52 . As described above, in the present embodiment, the pad arrangement space 61 and the pad assembly space 52 are formed in such a shape that the inner pad 102 in a new state can be assembled to the caliper body 15 . FIG. 9 is also a view of the vicinity of the pad arrangement space 61 of the caliper body 15 viewed from the outside in the rotor radial direction along the direction of the radial reference line.

That is, the pad sliding portions 32A, 32B, 33A, 33B and the support connection portion 51 forming the pad assembly space 52 and the pad arrangement space 61 are previously assembled to the outer side pad sliding portions 32A, 33A. If the new outer side pad 102 is positioned at the outermost end position, the new inner side pad 102 can be prevented from moving from the inside to the outside in the radial direction of the rotor. It is possible to pass without

Conversely, the new inner pad 102 is assembled to the inner pad sliding portions 32B and 33B first, and then the new outer pad 102 is attached to the outer pad sliding portion. 32A and 33A, the inner pad 102 is moved to the innermost side, in other words, the back surface 126 of the back plate 121 of the inner pad 102 is brought into surface contact with the intermediate wall surface portion 86B. It is in a state where Accordingly, if the outer pad 102 in a new state is slanted with respect to the inner pad 102 , the extending portion 132 can pass through the pad assembly space 52 . In this manner, the pad arrangement space 61 and the pad assembly space 52 are formed in such a shape that the outer side pad 102 in a new state can be assembled to the caliper body 15 .

That is, the pad sliding portions 32A, 32B, 33A, 33B and the support connecting portion 51 forming the pad assembly space 52 and the pad arrangement space 61 are previously assembled to the inner side pad sliding portions 32B, 33B. If the new inner pad 102 is positioned at the innermost end position, the outer pad 102 in the new state is not hindered when it is moved from the inner side to the outer side in the radial direction of the rotor. can be passed through.

This relationship will be further explained with reference to FIG. FIG. 10 is also a view of the vicinity of the pad arrangement space 61 of the caliper body 15 viewed from the outside in the rotor radial direction along the direction of the radial reference line. In FIG. 10, the new outer pad 102 is first assembled to the outer pad sliding portions 32A and 33A, and then the new inner pad 102 is attached to the inner pad sliding portions 32B and 33B. The case of assembling is illustrated.

When viewed in the direction of the radial reference line, the tip surface 127 of the lining material 122 of the outer side pad 102 in a new state, which is first assembled to the outer side pad sliding portions 32A and 33A and is closest to the outer side. and the side surface 128 on the rotor entry side; and the boundary position X2 between the torque receiving surface 71B of the pad sliding portion 32B on the inner side and the rotor facing surface 72B; The shapes of the pad assembling space 52 and the pad arrangement space 61 are set so that the shortest distance Csm is larger than the new thickness Pt of the inner pad 102 . However, the straight line extending from the boundary position X2 to the rotor exit side perpendicular to the line connecting the boundary positions X1 and X2 does not intersect the intermediate wall surface portion 86B.

Similarly, the lining material 122 on the side of the pad assembly space 52 of the new inner pad 102 that has been assembled to the inner pad sliding portions 32B and 33B first and is closest to the inner side. Csm and do. The shapes of the pad assembly space 52 and the pad arrangement space 61 are set such that the shortest distance Csm is larger than the thickness Pt of the outer pad 102 when new.

That is, the shapes of the pad assembly space 52 and the pad arrangement space 61 are set such that Csm>Pt.

Here, the shortest distance Csm will be further explained.

Co=Ci as described above.
Let Ct=Co+Csx+Ci.
Also, A=Csx+Co-Pt.
Here, A is the distance between the tip surface 127 of the outer side pad 102 and the rotor facing surface 72B of the inner side pad sliding portion 32B.

Also, the shortest distance between the torque receiving surfaces 71B, 81A of the pad sliding portions 32B, 33A and the boundary position X1 of the lining material 122 of the outer pad 102 is S, and the line connecting the boundary position X1 and the boundary position X2 is , the angle formed by the torque receiving surfaces 71B and 81A is θ.

Then,
tan θ=S/A
θ = arctan (S/A)
cos θ=A/Csm
cos(arctan(S/A))=A/Csm
Csm = A/cos(arctan(S/A))
Csm=(Csx+Co−Pt)/cos(arctan(S/A))

As described above, the boundary position X2, which is the end of one of the inner-side pad sliding portions 32B on the disk rotor side and rotor rotation side, is the direction away from the disk rotor 11 in the other outer-side pad sliding portion 33A. When one new pad 102 is arranged at the end position of the pad 102, the shortest distance Csm to this pad 102 is longer than the thickness Pt of one pad 102, that is, Csm>Pt. ing.

In other words, the boundary position X2, which is the end of one of the inner-side pad sliding portions 32B on the disk rotor side and rotor rotation side, is the direction away from the disk rotor 11 on the other outer-side pad sliding portion 33A. When one new pad 102 is arranged at the end position of , the gap with this pad 102 is provided at a position longer than the thickness Pt of one pad 102 .

Therefore, when the outer pad 102 and the inner pad 102 are assembled in this order, the pair of pads 102 in a new state can be assembled to the caliper body 15 .

Similarly, the boundary position of the other outer side pad sliding portion 33A on the disc rotor side and the rotor run-out side end is in the direction away from the disc rotor 11 in the inner side pad sliding portion 32B. It is provided at a position where the shortest distance to this pad 102 is longer than the thickness of one pad 102 when one new pad 102 is arranged at the end position.

In other words, the boundary position of the other outer side pad sliding portion 33A on the disk rotor side and the rotor run-out side end is in the direction away from the disk rotor 11 in the inner side pad sliding portion 32B. It is provided at a position where the gap with this pad 102 is longer than the thickness of one pad 102 when one new pad 102 is arranged at the end position.

Therefore, when the inner pad 102 and the outer pad 102 are assembled in this order, the pair of new pads 102 can be assembled to the caliper body 15 .

The above-mentioned Patent Document 1 discloses a disc brake having a structure in which a caliper body is provided with a space opening in the radial direction of the rotor and a pad is arranged in this space. There is a demand for miniaturization of disc brakes, but simply miniaturizing them makes it impossible to attach the pads to the caliper body.

In contrast, in the present embodiment, Co+Csx, which is the sum of the outer-side pad sliding portion 33A and the pad assembly space 52 in the rotor axial direction, is equal to the thickness of two pads 102, 2×Pt. is smaller than Similarly, Ci+Csx, which is the sum of the inner-side pad sliding portion 32B and the pad assembly space 52 in the rotor axial direction, is smaller than the thickness of two pads 102, 2×Pt. . As a result, the caliper body 15 can be miniaturized at least in the axial direction of the rotor.

In addition, the boundary position X2, which is the end of one of the inner-side pad sliding portions 32B on the disk rotor side and rotor rotation side, is separated from the disk rotor 11 on the other outer-side pad sliding portion 33A. It is provided at a position where the shortest distance Csm to this pad 102, that is, the gap is longer than the thickness Pt of one pad 102 when one new pad 102 is arranged at the end position of the direction.

Similarly, the boundary position of the other outer-side pad sliding portion 33A on the disk rotor side and the rotor run-out side is in the direction away from the disk rotor 11 in the inner-side pad sliding portion 32B. It is provided at a position where the shortest distance to this pad 102, ie, the gap, is longer than the thickness of one pad 102 when one new pad 102 is arranged at the end position.

As a result, the pair of pads 102 in a new state can be assembled to the caliper body 15 .

Therefore, the size of the caliper body 15 and thus the caliper 12 can be reduced while ensuring the ease of assembly of the pair of pads 102 in a new state to the caliper body 15 . As a result, it is possible to reduce the weight and cost of the caliper 12 and improve the mountability on the vehicle.

Further, the pad assembly space 52 is provided on the rotor turn-in side when the vehicle moves forward. Therefore, it is possible to connect the pad sliding portions 32A and 33B on the rotor run-out side, which receives a large torque, with the support connecting portion 51 to increase the rigidity thereof. Further, the locking surface portions 73A and 83B of the pad sliding portions 32A and 33B that lock the pad 102 can be connected to each other by the locking surface portion 53 of the support connecting portion 51. As shown in FIG. Therefore, the caliper body 15 has an increased contact area with the pad 102 on the rotor run-out side. Therefore, vibration resistance is improved. In addition, processing for forming a pad assembly space between the pad sliding portions 32A and 33B is not required, and processing costs can be reduced. That is, the rigidity and vibration resistance of the caliper main body 15 can be effectively improved, and the machining cost can be reduced, as compared with the case where the pad assembly space is provided on the rotor run-out side.
Note that the support connecting portion 51 may not necessarily be provided. That is, if the gap between the pad sliding portions 32A and 33B is made narrower in the rotor axial direction than the gap between the pad sliding portions 32B and 33A, in other words, the distance between the rotor facing surfaces 72B and 82A, the caliper body 15 It is effective in improving the rigidity and vibration resistance of the
In this embodiment, the pad assembly space 52 is formed only on the rotor rotation entry side of the caliper body 15 when the vehicle moves forward. However, in addition to this configuration, the pad assembly space 52 may also be formed on the rotor rotation side of the caliper body 15 when the vehicle moves forward. Further, the pad assembly space 52 may be formed only on the rotor rotation exit side of the caliper body 15 when the vehicle moves forward.
Furthermore, although the rotor facing surfaces 72B and 82A are arranged to extend perpendicularly to the rotor axis, they may be inclined so as to extend obliquely to the rotor axis.

The disc brake according to the first aspect of the present embodiment described above includes a pair of pads that press the disc rotor; a caliper body having a pair of pad sliding portions that support the pair of pads slidably in the rotor axial direction on both sides of the pad assembly space in the rotor axial direction; wherein the total length of the pad sliding portion on either one of the outer side and the inner side and the pad assembly space is shorter than the thickness of two of the pads, and the pair of sliding pad When one pad is placed at the end of one of the pair of pad sliding portions on the disk rotor side in the direction away from the disk rotor, the gap between the pad and the pad is provided at a position longer than the thickness of one pad.
With this configuration, miniaturization is possible.

Further, according to a second aspect, in the first aspect, the pad assembly space is formed on the inlet side in the rotational direction of the disc rotor when the vehicle moves forward.

In a third aspect, in the first aspect or the second aspect, the end portion of the pad sliding portion on the disk rotor side is the end of the pad sliding portion on the disk rotor side in the rotor running-out direction. It is in the boundary position of the part.

A disc brake according to a fourth aspect includes a pair of pads for pressing a disc rotor; a pad assembly space arranged across the disc rotor and open in the rotor radial direction; a caliper body having a pair of pad sliding portions that support the pair of pads slidably in the rotor axial direction on both sides of the space in the rotor axial direction; The total length of the pad sliding portion on either side and the pad assembly space is shorter than the thickness of two pads, and the disc in one of the pair of pad sliding portions When one of the pads is arranged at the end of the other of the pair of pad sliding portions in the direction away from the disk rotor, the distance from the pad is one of the pads. It is provided at a position that is longer than the thickness of one inch.
With this configuration, miniaturization is possible.

Further, according to a fifth aspect, in the fourth aspect, the pad assembly space is formed on the inlet side in the rotational direction of the disc rotor when the vehicle moves forward.

In a sixth aspect, in the fourth aspect or the fifth aspect, the end portion of the pad sliding portion on the disk rotor side is the end of the pad sliding portion on the disk rotor side in the rotor running-out direction. It is in the boundary position of the part.

According to the disc brake of the present invention, miniaturization is possible.

REFERENCE SIGNS LIST 10 disk brake 11 disk rotor 15 caliper body 32A, 32B, 33A, 33B pad sliding portion 52 pad assembly space

Claims (3)

a pair of pads pressing against the disk rotor;
A pad assembly space arranged across the disk rotor and open in the radial direction of the rotor, and a pair of pads slidable in the rotor axial direction on both sides of the pad assembly space in the rotor axial direction. a caliper body having a pair of supporting pad slides;
with
In the axial direction of the rotor, a total length of the pad sliding portion on either one of the outer side and the inner side and the pad assembly space is shorter than the thickness of two of the pads,
When one pad is placed at a position where the end portion of one of the pair of pad sliding portions on the disk rotor side is the end portion of the other of the pair of pad sliding portions in the direction away from the disk rotor. , a disc brake characterized in that the gap between said pad and said pad is provided at a position longer than one thickness of said pad. 2. A disc brake according to claim 1, wherein said pad assembly space is formed on an entrance side in a rotational direction of said disc rotor when the vehicle moves forward. 3. An end portion of the pad sliding portion on the disk rotor side is located at a boundary position which is an end portion of the pad sliding portion on the disk rotor side in the rotor running-out direction. Disc brakes as described in .

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