Disk brake, pad, and pair of shims

A pad includes: a lining; a plate; a first shim installed at a surface of the plate which is opposite to the lining; and a second shim installed at a surface of the first shim which is opposite to the plate, a first hook overhanging at an outer circumferential edge section of the plate and hooked to the outer circumferential edge section of the plate is formed at the first shim, a second hook is formed at the second shim at an outer side of the first hook in a disk radial direction, and the second hook is configured to be hooked to a part of the plate with which the first hook does not come in contact.

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to a disk brake configured to brake a vehicle, and a pad and a pair of shims used for the same.

Priority is claimed on Japanese Patent Application No. 2004-118783, filed Jun. 9, 2014, the content of which is incorporated herein by reference.

Description of Related Art

There is a pad including a shim provided at a pad for a disk brake (for example, see Japanese Unexamined Patent Application, First Publication No. 2006-46561)

In work of dealing with a pad independently, such as exchange work or the like, when a shim is provided at the pad, there is a need to carefully perform the work such that the shim does not drop from the pad. For this reason, when a structure in which the shim is easily dropped from the pad is provided, working efficiency may be decreased.

SUMMARY OF THE INVENTION

The present invention provides a disk brake capable of suppressing a shim from being dropped from a pad, and a pad and a pair of shims used for the same.

According to a first aspect of the present invention, a disk brake includes: a support member disposed so as to astride an outer circumferential side of a disk; a pair of pads supported by the support member and disposed to face surfaces of the disk; and a pressing mechanism configured to press the pair of pads against the disk, wherein the pad includes: a lining configured to contact with the disk; a plate installed at a surface of the lining which is opposite to the disk; a first shim installed at a surface of the plate which is opposite to the lining; and a second shim installed at a surface of the first shim which is opposite to the plate, a first hook overhanging at an outer circumferential edge section of the plate and hooked to the outer circumferential edge section of the plate is formed at the first shim, a second hook is formed at the second shim at an outer side of the first hook in a disk radial direction, and the second hook is configured to be hooked to a part of the plate with which the first hook does not come in contact.

According to a second aspect of the present invention, the second hook is formed to astride the first hook, and hooked to a corner section of the plate at the lining side.

According to a third aspect of the present invention, the second hook is formed to astride the first hook, and hooked to a surface of the plate at the lining side.

According to a fourth aspect of the present invention, the first hook is divided into two divided sections, and the second hook is disposed between the two divided sections.

According to a fifth aspect of the present invention, a contact type sensor is installed at the plate and is configured to come in contact with the disk to generate a warning sound when the lining is abraded and a distance between the disk and the plate in an disk axial direction arrives at a predetermined value, and a front end section position of the second hook in the disk axial direction is disposed closer to the plate than a front end section position of the contact type sensor.

According to a sixth aspect of the present invention, the second hook is installed at a central position of the pad in a disk tangential direction.

According to a seventh aspect of the present invention, a width dimension W1of the second hook in the disk tangential direction is set to be smaller than a width dimension W2of a cutout portion in the disk tangential direction, and the second hook is hooked within a range of the cutout portion, the cutout portion being formed at the outer circumferential edge section of the plate.

According to an eighth aspect of the present invention, sliding restriction sections configured to abut the support member in the disk tangential direction and configured to restrict sliding of the second shim are installed at both sides of the second shim in the disk tangential direction, and a width dimension W3between the sliding restriction sections, a width dimension W4between abutting surfaces formed in the disk tangential direction at both sides of the pad abutting with the support member in the disk tangential direction, the width dimension W1of the second hook, and the width dimension W2of the cutout portion satisfy a relation of (W2−W1)≧(W4−W3).

According to a ninth aspect of the present invention, metal surfaces of the first shim and the second shim come in contact with each other.

According to a tenth aspect of the present invention, the first hook is divided into two divided sections, and the second hook is disposed between the two divided sections.

According to an eleventh aspect of the present invention, a contact type sensor is installed at the plate and is configured to come in contact with the disk to generate a warning sound when the lining is abraded and a distance between the disk and the plate in the disk axial direction arrives at a predetermined value, and a front end section position of the second hook in the disk axial direction is disposed closer to the plate than the front end section position of the contact type sensor.

According to a twelfth aspect of the present invention, the second hook is installed at a central position of the pad in the disk tangential direction.

According to a thirteenth aspect of the present invention, the width dimension W1of the second hook in the disk tangential direction is set to be smaller than the width dimension W2of the cutout portion in the disk tangential direction, and the second hook is hooked within a range of the cutout portion, the cutout portion being formed at the outer circumferential edge section of the plate.

According to a fourteenth aspect of the present invention, sliding restriction sections configured to abut the support member in the disk tangential direction and configured to restrict sliding of the second shim are installed at both sides of the second shim in the disk tangential direction, and wherein a width dimension W3between the sliding restriction sections, a width dimension W4between abutting surfaces formed in the disk tangential direction at both sides of the pad abutting with the support member in the disk tangential direction, the width dimension W1of the second hook, and the width dimension W2of the cutout portion satisfy a relation of (W2−W1)≧(W4−W3).

According to a fifteenth aspect of the present invention, metal surfaces of the first shim and the second shim come in contact with each other.

According to a sixteenth aspect of the present invention, a pad includes a lining configured to contact with a disk; a plate installed at a surface of the lining which is opposite to the disk; a first shim installed at a surface of the plate which is opposite to the lining; and a second shim installed at a surface of the first shim which is opposite to the plate, wherein a first hook overhanging at an outer circumferential edge section of the plate and hooked to the outer circumferential edge section of the plate is formed at the first shim, a second hook is formed at the second shim at an outer side of the first hook in a disk radial direction, and the second hook is configured to be hooked to a part of the plate with which the first hook does not come in contact.

According to a seventeenth aspect of the present invention, a pair of shims for covering a plate which is installed at a surface of a lining, the lining being configured to be in contact with the disk and the surface of the lining being opposite to a disk, wherein the pair of shims having a first shim installed at a surface of the plate which is opposite to the lining, and a second shim installed at a surface of the first shim which is opposite to the plate, a first hook overhanging at an outer circumferential edge section of the plate and hooked to the outer circumferential edge section of the plate is formed at the first shim, a second hook is formed at the second shim at an outer side of the first hook in a disk radial direction, and the second hook is configured to be hooked to a part of the plate with which the first hook does not come in contact.

According to the aspects of the present invention, it is possible to provide a disk brake capable of suppressing the shim from being dropped from the pad, and a pad and a pair of shims used for the same.

DETAILED DESCRIPTION OF THE INVENTION

A first embodiment according to the present invention will be described below with reference toFIGS. 1 to 6. A disk brake10of the first embodiment is provided for a vehicle such as an automobile or the like, specifically, a four-wheeled automobile. The disk brake10brakes the vehicle by stopping rotation of a disk11shown inFIG. 1rotated with a wheel (not shown).

The disk brake10includes a support member12, a pair of pads13and14, and a pressing mechanism15. The support member12is disposed to astride an outer circumferential side of the disk11to be fixed to a non-rotation section of the vehicle as shown inFIG. 2. The pair of pads13and14shown inFIG. 1is disposed to face surfaces11aand11bof the disk11while being supported by the support member12. The pressing mechanism15sandwiches the pair of pads13and14to press the pads13and14against both of the surfaces11aand11bof the disk11.

Hereinafter, it will be described using three directions that differ by 90°, i.e., a disk axial direction X, a disk tangential direction Y, and a disk radial direction Z. The disk axial direction X is a direction parallel to a central axis of the disk11. The disk tangential direction Y is a direction parallel to a tangential line at an intersection position between a surface including a central axis of the disk11and centers of the pads13and14, and an outer circumferential surface of the disk11. The disk radial direction Z is a direction parallel to a line in a radial direction which passes a center of the pad13or the pad14and which is perpendicular to the central axis of the disk11. In the disk radial direction Z, a central axis side of the disk11is referred to as an inside and an opposite side of the central axis of the disk11is referred to as an outerside.

As shown inFIG. 2, the support member12is constituted by a carrier17and a pair of pad guides18and18attached to the carrier17. The carrier17is disposed to astride the outer circumferential side of the disk11to be attached to the non-rotation section of the vehicle. The carrier17is an integrally formed product having an inner side disposition section20, an outer side disposition section21, and a pair of connecting sections22and22. The inner side disposition section20is disposed to face the surface11aof an inner side thereof (inside in the vehicle width direction) with respect to the disk11. The outer side disposition section21is disposed to face the surface11bof the outer side thereof (outer side in the vehicle width direction) with respect to the disk11and to be spaced apart from the inner side disposition section20. The pair of connecting sections22and22is disposed to be spaced apart from each other in the disk tangential direction Y, and both of the connecting sections22and22connect the inner side disposition section20and the outer side disposition section21while astriding the outer circumferential side of the disk11in the disk axial direction X.

The inner side disposition section20has an attachment base section24extending in the disk tangential direction Y. In addition, the inner side disposition section20has a pair of inner side pad support sections26and26, one of which is shown inFIG. 2and the other of which is shown inFIG. 1. The pair of inner side pad support sections26and26extend outward in the disk radial direction Z from both end sections of the attachment base section24in the disk tangential direction Y. End sections of the pair of inner side pad support sections26and26opposite to the attachment base section24are connected to the connecting sections22and22. While only one is shown inFIG. 2, two attachment holes27are formed in the inner side disposition section20at both ends in the disk tangential direction Y of the attachment base section24. The carrier17is fixed to the non-rotation section of the vehicle by fasteners (bolts) screwed into the attachment holes27.

The outer side disposition section21has an outer beam section30shown inFIG. 1extending in the disk tangential direction Y. In addition, the outer side disposition section21has a pair of outer side pad support sections31and31, one of which is shown inFIG. 1and the other of which is shown inFIG. 2. The pair of outer side pad support sections31and31extends outward in the disk radial direction Z from both end sections of the outer beam section30in the disk tangential direction Y. End sections of the pair of outer side pad support sections31and31opposite to the outer beam section30is connected to the connecting sections22and22.

The pair of pad guides18and18is mounted on the pair of connecting sections22and22, the pair of inner side pad support sections26and26and the pair of outer side pad support sections31and31. That is, as shown inFIG. 2, the one pad guide18is attached to the connecting section22, the inner side pad support section26and the outer side pad support section31, all of which are on the same side in the disk tangential direction Y. In addition, as shown inFIG. 1, the other pad guide18is attached to the connecting section22, the inner side pad support section26and the outer side pad support section31, all of which are on opposite sides in the disk tangential direction Y.

The pair of pads13and14shown inFIG. 1is movably supported by the support member12in the disk axial direction X. The one pad13is disposed at an inner side (inside in the vehicle width direction) of the disk11. In the inner side pad13, both end sections in the disk tangential direction Y are supported by the pair of inner side pad support sections26and26, one of which is shown inFIG. 2and the other of which is shown inFIG. 1, via the pair of pad guides18and18shown inFIG. 2.

As shown inFIG. 1, the other pad14is disposed at the outer side (outer side in the vehicle width direction) of the disk11. Both end sections of the pad14in the disk tangential direction Y are supported by the pair of outer side pad support sections31and31, one of which is shown inFIG. 2and the other of which is shown inFIG. 1, via the pair of pad guides18and18shown inFIG. 2.

As shown inFIG. 1, the inner side pad13is constituted by a lining33and a plate34. The lining33comes in contact with the disk11in a surface33a. The plate34is installed at the surface33bopposite to the surface33aof the lining33. A surface34aof the lining33side of the plate34and a surface33bof the plate34side of the lining33are fixed to each other. Accordingly, the inner side pad13is configured to be integrally formed with the lining33and the plate34. In the inner side pad13, a surface34bof the plate34opposite to the lining33comes in contact with the pressing mechanism15. In the inner side pad13, both end sections of the plate34in the disk tangential direction Y are supported by the support member12. The inner side pad13comes in contact with the disk11in the surface33aof the lining33by being pressed by the pressing mechanism15.

The outer side pad14has a pad main body35, which is a common part with the inner side pad13. The pad main body35also comes in contact with the disk11in the surface33a. The plate34is installed at the surface33bof the pad main body35opposite to the surface33a. The surface34aat the lining33side of the plate34and the surface33bat the plate34side of the lining33are fixed to each other. Accordingly, the pad main body35of the pad14at the outer side is configured to be integrally formed with the lining33and the plate34. Also in the pad main body35, both end sections of the plate34in the disk tangential direction Y are supported by the support member12.

The outer side pad14includes the pad main body35, a first shim36, and a second shim37. The first shim36is installed at the surface34bopposite to the surface34ain contact with the lining33of the plate34of the pad main body35. The first shim36comes in contact with the surface34bof the plate34in a surface36a. The second shim37is installed at a surface36bopposite to the surface36aof the first shim36. The second shim37comes in contact with the surface36bof the first shim36in a surface37a. A surface37bopposite to the surface37aof the second shim37comes in contact with the pressing mechanism15. The outer side pad14comes in contact with the disk11in the surface33aof the pad main body35as the surface37bof the second shim37is pressed by the pressing mechanism15.

As shown inFIG. 2, the pressing mechanism15is disposed to astride the outer circumferential side of the disk11in the disk axial direction X to be movably attached to the support member12in the disk axial direction X. The pressing mechanism15has a caliper body41, a pair of bolts42and42attached to both end sections of the caliper body41in the disk tangential direction Y, a pair of slide pins43and43attached to the caliper body41by the pair of bolts42and42, and a pair of pin boots44and44configured to cover the pair of slide pins43and43.

The pair of slide pins43and43is fitted into support holes (not shown) formed in the disk axial direction X at the pair of connecting sections22and22of the carrier17to be slidable in the disk axial direction X. Accordingly, the caliper body41fixed to the slide pins43and43is movable in the disk axial direction X together with the slide pins43and43.

The pair of pin boots44and44expands and contracts according to a variation in projection amount from the support holes (not shown) by movement of the pair of slide pins43and43. Accordingly, the pair of pin boots44and44normally covers portions of the slide pins43and43exposed from the carrier17.

As shown inFIG. 1, the pressing mechanism15has a piston48, a piston seal49, a piston boot50, and a pressing plate51. The piston48is slidably installed at the inner side (inside in the vehicle width direction) of the caliper body41, and installed at one side of the pressing mechanism15in the disk axial direction X. The piston seal49seals a gap between the caliper body41and the piston48. The piston boot50is connected to the caliper body41and the piston48to cover a portion of the piston48exposed from the caliper body41.

The caliper body41has a cylinder section56, a bridge section57, and a claw portion58. A bore55into which the piston48is slidably fitted is formed in the cylinder section56. The bridge section57extends in the disk axial direction X from an outside position of the cylinder section56in the disk radial direction Z to astride the outer circumference of the disk11. The claw portion58extends inward in the disk radial direction Z from an opposite side of the bridge section57with respect to the cylinder section56to face the cylinder section56. In other words, the bridge section57connects the cylinder section56and the claw portion58. In addition, as shown inFIG. 2, the caliper body41has a pair of extension sections59and59. The pair of extension sections59and59extends from the cylinder section56toward both sides in the disk tangential direction Y, and the above-mentioned slide pins43and43are attached to the distal end side by the pair of bolts42and42. The caliper body41is an integrally formed product constituted by the cylinder section56, the bridge section57, the claw portion58and the pair of extension sections59and59through casting.

As shown inFIG. 1, the bore55is formed in the cylinder section56in the disk axial direction X to be opened at the claw portion58side. Accordingly, the cylinder section56has a bottom section61opposite to the claw portion58, and a cylindrical section62extending from the outer circumferential edge section of the bottom section61toward the claw portion58to form a cylindrical shape. That is, the cylinder section56forms a bottomed cylindrical shape. An annular piston seal groove63is formed in the inner circumferential surface of the bore55at an intermediate position in the disk axial direction X. In addition, an annular boot support groove64is formed in the inner circumferential surface of the bore55at the end section of the claw portion58side. The piston seal49is fitted into the piston seal groove63, and thus the piston seal49is supported by the cylinder section56. A through-hole65passing in the disk axial direction X is formed in the bottom section61of the cylinder section56. The through-hole65is closed by the cap66which is removed upon assembly to the vehicle.

The piston48is formed in a bottomed cylindrical shape having a bottom section71and a cylindrical section72extending from the outer circumferential edge section of the bottom section71to form a cylindrical shape. An annular boot support groove73is formed at an outer circumferential section of the cylindrical section72opposite to the bottom section71. The piston48is fitted into the bore55and the piston seal49in a posture in which the bottom section71is disposed at an inner side (the bottom section61side) of the bore55. The piston seal49seals a gap between the cylinder section56and the piston48.

The piston boot50has one end side fitted into the boot support groove64of the cylinder section56to be connected to the cylinder section56, and the other side fitted into the boot support groove73of the piston48to be connected to the piston48.

The pressing plate51is attached to the piston48. The pressing plate51has a cover plate section75configured to cover an end surface of the cylindrical section72opposite to the bottom section71, and a pair of locking claws76and76extending from the cover plate section75to be locked to the inner circumferential surface of the cylindrical section72.

While supported by the cylinder section56, the end surface of the cylindrical section72of the piston48opposite to the bottom section71faces the claw portion58. The piston48slides in the cylinder section56in the disk axial direction X. The piston48faces opposite to the disk11at the side of the inner side pad13, and presses the inner side pad13via the pressing plate51.

A recess78concaved outward in the disk radial direction Z from the end section inside in the disk radial direction Z is formed in the claw portion58. The recess78is a portion through which a tool configured to process the inside of the bore55passes. Accordingly, the recess78matches positions in both the disk tangential direction Y and the disk radial direction Z about a center of the bore55, i.e., the piston48. The claw portion58has a base section79at the bridge section57side, and a pair of projection sections80protruding inward in the disk radial direction Z from both sides of the base section79in the disk tangential direction Y, although only one is shown inFIG. 1. The claw portion58faces opposite to the disk11at a side of the outer side pad14, and presses the outer side pad14with the end surface of the claw portion58which is at the cylinder section56side.

In the pressing mechanism15, when a brake fluid is introduced into the bore55of the cylinder section56from the through-hole65, the piston48advances toward the disk11in the disk axial direction X. Then, the piston48presses the plate34of the inner side pad13toward the disk11via the cover plate section75of the pressing plate51. Accordingly, the pad13moves on the pair of inner side pad support sections26and26of the carrier17, one of which is shown inFIG. 2and the other of which is shown inFIG. 1, in the disk axial direction X via the pad guides18and18shown inFIG. 2. According to the movement, the pad13brings the surface33aof the lining33in contact with the surface11aof the disk11.

In addition, according to a reactive force of the pressing, the pressing mechanism15moves toward the inner side in the disk axial direction X with respect to the carrier17via the pair of slide pins43and43shown inFIG. 2, the outer side pad14is pressed toward the disk11at the end surface of the claw portion58which is at the disk11side as shown inFIG. 1. Accordingly, the pad14moves on the pair of outer side pad support sections31and31of the carrier17, one of which is shown inFIG. 2and the other of which is shown inFIG. 1, in the disk axial direction X via the pad guides18and18shown inFIG. 2. According to the movement, the pad14brings the surface33aof the lining33shown inFIG. 1in contact with the surface11bof the disk11.

As described above, the pressing mechanism15sandwiches the pair of pads13and14from both sides thereof with the piston48and the claw portion58and presses the pads13and14against both of the surfaces11aand11bof the disk11by an operation of the piston48. As a result, the pressing mechanism15applies a frictional resistance to the disk11to generate a braking force. Here, the support member12receives a braking torque of the pad13at the inner side disposition section20of the carrier17via the pad guide18, and the support member12receives the braking torque of the pad14at the outer side disposition section21of the carrier17via the pad guide18.

As shown inFIG. 3, the pad main body35forms a mirror symmetrical shape with about a surface which is perpendicular to the disk tangential direction Y and which passes through a center of the pad main body35in the disk tangential direction Y. The plate34of the pad main body35has a main plate section83, and a pair of convex sections84and84. The lining33is joined to the main plate section83of the plate34. The pair of convex sections84and84protrudes outward in the disk tangential direction Y from the intermediate positions in the disk radial direction Z of both end sections in the disk tangential direction Y of the main plate section83. The pair of convex sections84and84of the pad main body35is supported by the support member12shown inFIG. 2.

As shown inFIGS. 3 and 4, an end surface83aof the main plate section83which locates at the outer side in the disk radial direction Z forms a shape having a central part of the end surface83ato be expanded at the outer side in the disk radial direction Z as being closer to the center of the end surface83ain the disk tangential direction Y. In an outer circumferential edge section34A of the plate34, a cutout portion86concaved inward in the disk radial direction Z is formed at an end edge section83A which is located at the outer side in the disk radial direction Z and which includes the end surface83aof the main plate section83. The cutout portion86is formed at a center of the end edge section83A in the disk tangential direction Y and at a center of the plate34in the disk tangential direction Y. The cutout portion86has a pair of wall surfaces86aand86aformed in the disk radial direction Z, and a bottom surface86bformed in the disk tangential direction Y between the wall surfaces86aand86a. The wall surfaces86aand86aand the bottom surface86bare also formed in the disk axial direction X. Accordingly, the wall surfaces86aand86aof the cutout portion86are perpendicular to the disk tangential direction Y, and the bottom surface86bof the cutout portion86is perpendicular to the disk radial direction Z.

In the outer circumferential edge section34A of the plate34, a pair of stepped sections89and89concaved outward in the disk radial direction Z is formed at an end edge section83B which is disposed at an inner side in the disk radial direction Z and which includes an end surface83bof the main plate section83which is disposed at an inner side in the disk radial direction Z. The pair of stepped sections89and89is formed at both end sections of the end edge section83B in the disk tangential direction Y. The stepped sections89and89each have a wall surface89aformed in the disk radial direction Z, and a stepped surface89bformed in the disk tangential direction Y. In the pair of stepped sections89and89, the pair of wall surfaces89aand89ais disposed at a side at which the pair of stepped sections89and89is closer to each other, and the pair of stepped surfaces89band89bis disposed at a side at which the pair of stepped sections89and89is more spaced apart from each other. The wall surfaces89aand89aand the stepped surfaces89band89bare formed in the disk axial direction X. Accordingly, the pair of wall surfaces89aand89ais perpendicular to the disk tangential direction Y, and the pair of stepped surfaces89band89bis perpendicular to the disk radial direction Z. The pair of stepped surfaces89band89bis disposed on the same plane.

A pair of side surfaces83cand83cfurther outside in the disk tangential direction Y than the pair of stepped sections89and89of the main plate section83is disposed further inside in the disk radial direction Z than the pair of convex sections84and84. The pair of side surfaces83cand83cis inclined with respect to the disk radial direction Z such that a distance in the disk tangential direction Y is more increased in the outer side in the disk radial direction Z.

A pair of end surfaces (abutting surfaces)84aand84aof both ends of the pair of convex sections84and84in the disk tangential direction Y is disposed at both ends of the plate34in the disk tangential direction Y. The pair of end surfaces84aand84ais formed in the disk radial direction Z and in the disk axial direction X. In other words, the pair of end surfaces84aand84ais perpendicular to the disk tangential direction Y. A pair of stepped sections91and91is formed at the pair of convex sections84and84further outside in the disk radial direction Z than the end surfaces84aand84a. The pair of stepped sections91and91is concaved in a stepped shape further inside in the disk tangential direction Y than the end surfaces84aand84a.

In the pad main body35of the outer side pad14, the pair of convex sections84and84is slidably supported in the disk axial direction X at the pair of outer side pad support sections31and31, one of which is shown inFIG. 2and the other of which is shown inFIG. 1, via the outer side portions of the pair of pad guides18and18. In the pad main body35, when moved in the disk tangential direction Y by rotation of the disk11upon braking, the end surface84aof a downstream side in a moving direction of the end surfaces84aand84aabuts the pad guide18to be received by the pad guide18and the outer side pad support section31. Accordingly, further movement of the pad main body35in the disk tangential direction Y is restricted.

In addition, the inner side pad13serving as a common part with the pad main body35is supported such that the pair of convex sections84and84can be slid in the disk axial direction X at the pair of inner side pad support sections26and26, one of which is shown inFIG. 2and the other is shown inFIG. 1, via the inner sides portions of the pair of pad guides18and18. In the inner side pad13, when moved in the disk tangential direction Y by the rotation of the disk11upon braking, the end surface84aof the downstream side in the moving direction of the end surfaces84aand84aabuts the pad guide18to be received by the pad guide18and the inner side pad support section26. Accordingly, further movement of the inner side pad13in the disk tangential direction Y is restricted.

As shown inFIGS. 3 and 5, a pair of chamfers92and92is formed at the lining33at the opposite side of both end sections of the plate34in the disk tangential direction Y. In addition, a groove93is formed in the lining33in the disk radial direction Z at a center in the disk tangential direction Y.

As shown inFIG. 5, the first shim36and the second shim37locked at the surface34bside of the plate34, i.e., a side of the plate34opposite to the lining33, are installed at the pad main body35of the outer side pad14where the first shim36and the second shim37are in an overlapping state. Since the first shim36and the second shim37are formed by punching and bending metal plate members, the entire contact therebetween becomes a contact between the metal surfaces of the first shim36and the second shim37.

The first shim36disk tangential direction Y forms a mirror symmetrical shape about a surface which is perpendicular in the disk tangential direction Y and which passes through a center of the first shim36in the disk tangential direction Y. The first shim36has a cover plate section95. The cover plate section95has a flat plate shape, and covers the surface34bof the plate34of the pad main body35. The surface36aand the surface36b, which are described above, of the first shim36are mainly formed at the cover plate section95. The cover plate section95is perpendicular to the disk axial direction X, in other words, parallel to the disk tangential direction Y and parallel to the disk radial direction Z.

In addition, the first shim36has an outside hook96(a first hook). The outside hook96extends outward in the disk radial direction Z from a center in the disk tangential direction Y of an end edge section of the cover plate section95and then extends toward the pad main body35in the disk axial direction X. The end edge section is located at the outer side of the cover plate section95in the disk radial direction Z. The outside hook96has a base plate section97, an intermediate plate section98, and a front end plate section99. The base plate section97has a flat plate shape, and extends outward in the disk radial direction Z from the cover plate section95to form the same plane. The intermediate plate section98extends toward the pad main body35in the disk axial direction X while being curved from an end edge section of the base plate section97opposite to the cover plate section95. The front end plate section99has a flat plate shape, and extends toward an opposite side of the base plate section97in the disk axial direction X from the end edge section of the intermediate plate section98opposite to the base plate section97. The front end plate section99is inclined to be disposed inside in the disk radial direction Z toward an opposite side of the base plate section97. The outside hook96is installed at a central position of the first shim36in the disk tangential direction Y. All of the base plate section97, the intermediate plate section98and the front end plate section99are formed in the disk tangential direction Y, and positions thereof in the disk tangential direction Y are constant.

The first shim36has a pair of inside hooks105and105. The pair of inside hooks105and105extends toward both sides in the disk tangential direction Y from inside positions in the disk radial direction Z of both sides of the cover plate section95in the disk tangential direction Y, and then extend toward the pad main body35in the disk axial direction X. The pair of inside hooks105and105each has a base plate section106, an intermediate plate section107, and a front end plate section108. The base plate section106has a flat plate shape, is flush with the cover plate section95, and extends outward in the disk tangential direction Y from the cover plate section95. The intermediate plate section107protrudes toward an opposite side of the pad main body35in the disk axial direction X from the end edge section of the base plate section106opposite to the cover plate section95, and then is curved to return to the pad main body35. The front end plate section108has a flat plate shape, and extends toward an opposite side of the base plate section106in the disk axial direction X from a side of the intermediate plate section107which is opposite to the base plate section106.

In the first shim36, the outside hook96overhangs at the end edge section83A of the main plate section83in the outer circumferential edge section34A of the plate34to be locked to the end edge section83A. In addition, in the first shim36, the inside hooks105and105overhang at side edge sections83C and83C having the side surfaces83cand83cof both sides of the outer circumferential edge section34A of the plate34in the disk tangential direction Y, and are locked to the side edge sections83C and83C. In the outside hook96, a width dimension of the disk tangential direction Y is made smaller than the width dimension W2in the disk tangential direction Y, the width dimension W2being the width dimension of the cutout portion86formed at the end edge section83A of the plate34shown inFIG. 4, i.e., a distance between the wall surfaces86aand86a, and the outside hook is locked within a range of the cutout portion86as shown inFIG. 5.

In the first shim36, as shown inFIG. 6, the outside hook96comes in contact with the bottom surface86bof the cutout portion86of the plate34to be hooked thereto. In addition, in the first shim36, as shown inFIG. 3, the pair of inside hooks105and105comes in contact with both of the side surfaces83cand83cof the plate34in the disk tangential direction Y to be hooked thereto. In the first shim36attached to the pad main body35as described above, the outside hook96is installed at a central position in the disk tangential direction Y of the outer side pad14.

In a state in which the first shim36is attached to the pad main body35, the outside hook96is elastically deformed outward in the disk radial direction Z as shown inFIG. 6with respect to a natural state shown by two-dot chain lines ofFIG. 6. In this state, the outside hook96comes in line contact with an intermediate position in the disk axial direction X of the bottom surface86bof the cutout portion86of the plate34in a front end corner edge section99ainside of the end section of the front end plate section99opposite to the intermediate plate section98in the disk radial direction Z.

As shown inFIG. 4, the second shim37forms a mirror symmetrical shape about a surface which is perpendicular to the disk tangential direction Y and which passes through a center of the second shim37in the disk tangential direction Y. The second shim37has a cover plate section115. The cover plate section115has a flat plate shape, and covers the surface36bof the first shim36opposite to the plate34as shown inFIG. 5. The surface37aand the surface37bof the second shim37, which were described above, are mainly formed at the cover plate section115. The cover plate section115is perpendicular to the disk axial direction X. In other words, the cover plate section115is parallel to the disk tangential direction Y and parallel to the disk radial direction Z.

In addition, the second shim37has an outside hook116(a second hook). The outside hook116extends outward in the disk radial direction Z from a center in the disk tangential direction Y of an end edge section of the cover plate section115and then extends toward the pad main body35in the disk axial direction X. The end edge section is located at the outer side of the cover plate section115in the disk radial direction Z.

The outside hook116has a base plate section117, a curved plate section118, an intermediate plate section119, a curved plate section120, and a front end plate section121. The base plate section117has a flat plate shape, is flush with the cover plate section115, and extends outward in the disk radial direction Z from the cover plate section115. As shown inFIG. 6, the curved plate section118extends toward the pad main body35in the disk axial direction X while being curved from an end edge section of the base plate section117opposite to the cover plate section115. The intermediate plate section119has a flat plate shape, and extends to an opposite side of the base plate section117in the disk axial direction X from an end edge section of the curved plate section118opposite to the base plate section117. The curved plate section120extends to an opposite side of the base plate section117in the disk axial direction X while being curved from an end edge section of the intermediate plate section119opposite to the curved plate section118. The curved plate section120is curved to be disposed inward in the disk radial direction Z toward an opposite side of the base plate section117. The front end plate section121has a flat plate shape, and extends to an opposite side of the base plate section117in the disk axial direction X from an end edge section of the curved plate section120which is opposite to the intermediate plate section119. The front end plate section121extends to be inclined to be disposed inside in the disk radial direction Z toward an opposite side of the base plate section117.

The outside hook116is installed at the central position of the second shim37in the disk tangential direction Y as shown inFIG. 4. As shown inFIG. 5, all of the base plate section117, the curved plate section118, the intermediate plate section119, the curved plate section120and the front end plate section121are formed in the disk tangential direction Y, and positions thereof in the disk tangential direction Y are constant.

The second shim37has a pair of inside hooks125and125. The pair of inside hooks125and125extends inward in the disk radial direction Z from both side positions of the cover plate section115in the disk tangential direction Y inside in the disk radial direction Z, and then extend toward the pad main body35in the disk axial direction X. The pair of inside hooks125and125each has a base plate section126, an intermediate plate section127, and a front end plate section128shown inFIG. 3. The base plate section126shown inFIG. 5has a flat plate shape, is flush with the cover plate section115, and extends inward in the disk radial direction Z from the cover plate section115. The intermediate plate section127protrudes to an opposite side of the pad main body35in the disk axial direction X from an end edge section of the base plate section126opposite to the cover plate section115, and then is curved to return toward the pad main body35. The front end plate section128shown inFIG. 3extends to an opposite side of the base plate section126in the disk axial direction X from an end edge section of the intermediate plate section127shown inFIG. 5opposite to the base plate section126.

The second shim37has a pair of sliding restriction sections135and135. The pair of sliding restriction sections135and135extends to an opposite side of the cover plate section115in the disk tangential direction Y from both side positions of the cover plate section115in the disk tangential direction Y, and then protrude to an opposite side of the pad main body35in the disk axial direction X at an intermediate position of the cover plate section115in the disk radial direction Z. The pair of sliding restriction sections135and135each has a base plate section136and a restriction plate section137.

The base plate section136has a flat plate shape, is flush with the cover plate section115, and extends outward in the disk tangential direction Y from the cover plate section115. The restriction plate section137has a flat plate shape, and protrudes to an opposite side of the pad main body35in the disk axial direction X from an end edge section of the base plate section136opposite to the cover plate section115. The pair of sliding restriction sections135and135installed at both sides in the disk tangential direction Y of the second shim37as described above abuts the support member12shown inFIG. 2to restrict sliding of the second shim37in the disk tangential direction Y.

As shown inFIG. 5, in the second shim37, the outside hook116overhangs at the end edge section83A of the main plate section83in the outer circumferential edge section34A of the plate34to be hooked to the end edge section83A.

In addition, in the second shim37, the inside hooks125and125overhang at the stepped sections89and89inside in the disk radial direction Z in the outer circumferential edge section34A to be hooked to the stepped sections89and89.

The outside hook116of the second shim37is formed at a place at which it faces the outside hook96of the first shim36, i.e., a place at which it faces in the disk radial direction Z by overlapping the outside hook96and the position in the disk tangential direction Y (outer side of the outside hook96in the disk radial direction). In the outside hook116, a width dimension W1in the disk tangential direction Y shown inFIG. 4is made smaller than a width dimension W2in the disk tangential direction Y, the width dimension W2being the width dimension of the cutout portion86of the plate34, i.e., a distance between the wall surfaces86aand86a, and hooked within a range of the cutout portion86. A width dimension in the disk tangential direction Y of the outside hook96of the first shim36shown inFIG. 5is equal to the width dimension W1in the disk tangential direction Y of the outside hook116.

In the second shim37, as shown inFIG. 6, the outside hook116comes in contact with the cutout portion86of the plate34to be hooked thereto. In addition, in the second shim37, as shown inFIG. 3, the pair of inside hooks125and125comes in contact with the stepped surfaces89band89bof the stepped sections89and89of the plate34to be hooked thereto. In the second shim37attached to the pad main body35as described above, the outside hook116is installed at the central position of the outer side pad14in the disk tangential direction Y.

As shown inFIG. 6, the outside hook116of the second shim37is formed to astride the outside hook96of the first shim36in the disk axial direction X. In the state in which the second shim37is attached to the pad main body35, the outside hook116is elastically deformed outward in the disk radial direction Z as shown by a solid line ofFIG. 6with respect to a natural state shown by two-dot chain lines ofFIG. 6. Here, in the outside hook116, a surface121aof the front end plate section121which is disposed at inner side in the disk radial direction Z comes in line contact with corner edge sections86c(corner sections) which is disposed at the bottom surface86bside of the cutout portion86of the plate34and at the lining33side. Here, the front end plate section121is inclined with respect to the base plate section117in the disk axial direction X so that the opposite side of the base plate section117is disposed more inner side in the disk radial direction Z. As a result, the outside hook116is hooked to the plate34. In the front end plate section121, when the cover plate section115is moved away from the plate34in the disk axial direction X, a force resisting the movement is increased. Accordingly, the outside hook116restricts deviation of the second shim37from the plate34. The outside hook116of the second shim37comes in contact with and is locked to the corner edge section86cof the plate34with which the outside hook96of the first shim36does not come in contact.

As shown inFIG. 4, in the pair of sliding restriction sections135and135of the second shim37, end surfaces137aand137aof the pair of restriction plate sections137and137which is opposite to the base plate sections136and136is parallel to the end surfaces84aand84aof both sides of the pad main body35in the disk tangential direction Y. A width dimension W3between the sliding restriction sections135and135, i.e., a width dimension W3between the end surfaces137aand137a, is set to satisfy the following relation with a width dimension W4of the end surfaces84aand84aof the pad main body35, the width dimension W1of the outside hook116, and the width dimension W2of the cutout portion86.
(W2−W1)≧(W4−W3)

In the pad main body35, the end surfaces84aand84ain the disk tangential direction Y abut the support member12shown inFIG. 2in the disk tangential direction Y, and movement to either side in the disk tangential direction Y is also restricted. In the second shim37shown inFIG. 4, the end surfaces137aand137aof the sliding restriction sections135and135in the disk tangential direction Y abut the support member12shown inFIG. 2in the disk tangential direction Y, and movement to either side in the disk tangential direction Y is also restricted. An abutting position of the support member12at which the end surface84aand the end surface137ashown inFIG. 4abut each other is made to match a position in the disk tangential direction Y, while the end surface84aand the end surface137aare disposed at the same one side in the disk tangential direction Y.

In addition, an abutting position of the support member12at which the end surface84aand the end surface137aabut each other is made to match a position in the disk tangential direction Y, while the end surface84aand the end surface137aare disposed at the same opposite side in the disk tangential direction Y.

Upon braking, during rotation of the disk11shown inFIG. 1, the claw portion58of the caliper body41of the pressing mechanism15abuts the second shim37of the outer side pad14, and the pad main body35is pressed against the disk11via the first shim36. Then, the pad main body35in contact with the rotating disk11moves to an outlet side in a rotation direction of the disk11together with the disk11. In the pad main body35moved in this way, the end surface84aat the outlet side in the rotation direction of the disk11shown inFIG. 4abuts the pad guide18of the support member12shown inFIG. 2, and is caught by the pad guide18and the outer side disposition section21of the carrier17. Accordingly, the carrier17receives a braking torque of the outer side pad14at the outer side disposition section21disposed at the outlet side in the rotation direction of the disk11. Here, there is a case when the second shim37shown inFIG. 4moves to the outlet side in the rotation direction of the disk11together with the pad main body35. However, since the above-mentioned dimension relation is satisfied, even when the second shim37moves to the outlet side in the rotation direction of the disk11, as the end surface137aat the outlet side in the rotation direction of the disk11abuts the support member12, abutting of the outside hook116with the wall surface86aof the cutout portion86is restricted.

As shown inFIG. 5, protrusion sections141and141protruding from the surface34bin an opposite direction of the lining33are formed at the plate34of the pad main body35at positions of convex sections84and84. A contact type sensor142configured to come in contact with the disk11to generate a warning sound when the lining33is abraded and a distance between the disk11and the plate34in the disk axial direction X arrives at a predetermined value is attached to one of the protrusion sections141and141. The contact type sensor142has a fixing section143fixed to the plate34by caulking the protrusion section141, and a sensor unit144extending from the fixing section143to an opposite side of the lining33in the disk axial direction X and then returning and extending closer to the lining33than the surface34aby passing through a stepped section91of the convex section84.

As shown inFIG. 6, a front end corner edge section12lb located at an outer side in the disk radial direction Z of the front end plate section121is disposed closer to the plate34than a front end edge section144aof the sensor unit144. The front end plate section121becomes a front end section position of the outside hook116of the second shim37in the disk axial direction X. The sensor unit144becomes a front end section position of the contact type sensor142. That is, a position of the front end corner edge section121bin the disk axial direction X is within a range from a front end corner edge section99bthat becomes a front end section position of the outside hook96to the front end edge section144athat becomes a front end section position of the contact type sensor142.

A pad unit including a stacked shim disclosed in Japanese Unexamined Patent Application, First Publication No. 2006-46561 has a structure configured to hook a hook of a pad-side shim to a back plate of a pad, and hook a pressing member-side shim to the hook. For this reason, in work of dealing with a pad independently such as exchange work of a pad or the like, in particular, the pressing member-side shim is likely to deviate from the pad-side shim, it should be ensured that the shim does not drop when the work is performed, and working efficiency may be decreased.

On the other hand, in the disk brake10of the embodiment, the outside hook96of the first shim36of the pad14overhangs at the end edge section83A of the main plate section83in the outer circumferential edge section34A of the plate34to be hooked to the end edge section83A. For this reason, resistance in a deviation direction of the outside hook96with respect to the plate34can be increased, and deviation of the outside hook96from the plate34can be suppressed. In addition, the outside hook116of the second shim37is hooked to a part of the plate34with which the outside hook96does not come in contact. For this reason, resistance in the deviation direction of the outside hook116with respect to the plate34can be increased, and deviation of the outside hook116from the plate34can be suppressed. Accordingly, droppage of the first shim36and the second shim37from the pad14can be suppressed. Accordingly, workability when working with the pad14can be improved.

In addition, the outside hook96and the outside hook116are disposed to face each other. For this reason, an engaging structure of the outside hook96and the outside hook116can be provided, and the cutout portion86of the plate34disposed therein can be commonly used. Accordingly, low cost can be realized.

In addition, the outside hook116is locked to the corner edge section86cat the lining33side of the plate34. For this reason, resistance in the deviation direction of the outside hook116with respect to the plate34can be further increased, and deviation from the pad14can be further suppressed. Accordingly, droppage of the second shim37from the pad14can be further suppressed. In addition, the outside hook116comes in line contact with the plate34because the surface121aof the front end plate section121is locked to the corner edge section86cof the lining33side of the plate34. Accordingly, sliding resistance of the outside hook116in a surface direction of the plate34can be decreased. Accordingly, slidability of the second shim37in the surface direction of the plate34can be increased, and generation of noise upon braking can be suppressed.

In addition, the front end corner edge section121bdisposed at a front end section position of the outside hook116in the disk axial direction X is disposed closer to the plate34than the front end edge section144adisposed at a front end section position of the contact type sensor142. For this reason, contact of the outside hook116with the disk11before generation of a warning sound by the contact type sensor142can be suppressed. Accordingly, damage to the second shim37can be suppressed.

In addition, since the outside hook116is installed at the central position of the pad14in a disk tangential direction11, the outside hook116can be smoothly slid in both directions in the disk tangential direction Y. Accordingly, the second shim37can slide smoothly in both directions of the disk tangential direction Y. Accordingly, generation of abnormal sounds can be suppressed regardless of the rotation direction of the disk11.

In addition, the width dimension W1in the disk tangential direction Y of the outside hook116is made smaller than the width dimension W2of the cutout portion86formed at the outer circumferential edge section34A of the plate34. For this reason, the outside hook116can be smoothly slid within the range of the cutout portion86. Accordingly, slidability of the second shim37can be increased, and generation of abnormal sounds upon braking can be suppressed.

The width dimension W3between the sliding restriction sections135and135, the width dimension W4between the end surfaces84aand84aat both sides of the pad14, which abuts the support member12, in the disk tangential direction Y, the width dimension W1of the outside hook116, and the width dimension W2of the cutout portion86satisfy the relation of (W2−W1)≧(W4−W3). Accordingly, upon braking, as a sliding restriction section135abuts the support member12before the outside hook116abuts the wall surface86aof the cutout portion86, the outside hook116can be suppressed from abutting the wall surface86aof the cutout portion86. Accordingly, application of a load to the outside hook116can be suppressed.

The metal surfaces of the first shim36and the second shim37come in contact with each other. For this reason, when the outside hook116of the second shim37is hooked to the outside hook96of the first shim36, the second shim37is likely to be further deviated. For this reason, a suppression effect of droppage of the second shim37from the pad14is increased because the outside hook96is hooked to a place at which the outside hook96of the plate34does not come in contact with the outside hook116of the second shim37.

Next, a second embodiment will be described focusing on differences from the first embodiment mainly based onFIG. 7. Further, common parts with the first embodiment will be described with the same names and designated by the same reference numerals.

In the second embodiment, a first shim236partially different from the first shim36is used, and a second shim237partially different from the second shim37is used. The first shim236is distinguished from that of the first embodiment in that an outside hook296(a first hook) is divided into two divided sections297and297in the disk tangential direction Y with respect to the outside hook96of the first shim36to be spaced apart from each other in the disk tangential direction Y. In the two divided sections297and297of the outside hook296, a shape seen in the disk tangential direction Y is the same as that of the outside hook96.

The second shim237is distinguished from the first embodiment in that an outside hook316(a second hook) has a front end plate section321having a width smaller than the front end plate section121with respect to the outside hook116. The outside hook316has the same shape as the outside hook116when seen in the disk tangential direction Y. A width of the front end plate section321of the outside hook316is smaller than a width of a gap between the divided sections297and297of the outside hook296, and the front end plate section321of the outside hook316is disposed between the divided sections297and297.

According to the second embodiment, the outside hook316is disposed between the two divided sections297and297of the outside hook296. For this reason, interference between the outside hook296and the outside hook316can be suppressed. Accordingly, a degree of freedom in shape of the outside hook296and the outside hook316is increased.

Next, a third embodiment will be described focusing on differences from the first embodiment mainly based onFIG. 8. Further, common parts with the first embodiment will be described with the same names and designated by the same reference numerals.

In the third embodiment, a second shim337partially different from the second shim37is used. The second shim337has an outside hook416(a second hook) partially different from the outside hook116of the second shim37. The outside hook416has a curved plate section417and a curved plate section418, in addition to the base plate section117, the curved plate section118, the intermediate plate section119, the curved plate section120and the front end plate section121which are similar with the outside hook116. The curved plate section417has a shape that returns toward the inside in the disk radial direction Z and toward the plate34in the disk axial direction X while being curved from the end edge section of the front end plate section121opposite to the curved plate section120. The curved plate section418has a shape that returns toward the inside in the disk radial direction Z and toward an opposite side of the plate34in the disk axial direction X while being curved from the end edge section of the curved plate section417opposite to the front end plate section121. Then, the outside hook416is formed to astride the outside hook96in the disk axial direction X, and the curved plate section418abuts the surface34aof the plate34at the lining33side to be hooked thereto.

According to the third embodiment, the outside hook416is hooked to the surface34aof the plate34at the lining33side. For this reason, resistance in the deviation direction with respect to the plate34of the outside hook416can be further increased, and deviation of the outside hook416from the plate34can be further suppressed.

Further, while the embodiment in which the outside hook96(the first hook) of the first shim36and the outside hook116(the second hook) of the second shim37are installed at a central position of the outer side pad14in the disk tangential direction Y has been described, the embodiment is not limited thereto. For example, two sets of the first and second hooks may be installed, and the central positions in the disk tangential direction Y may be symmetrically disposed in pairs at left and right sides. In addition, while the first shim36formed of a metal material has been described, rubber may be adhered to a surface thereof.

The above-mentioned embodiment includes a support member disposed so as to astride an outer circumferential side of a disk, a pair of pads supported by the support member and disposed to face both surfaces of the disk, and a pressing mechanism configured to press the pair of pads against the disk, each of the pads includes a lining configured to contact with the disk, a plate installed at a surface of the lining which is opposite to the disk, a first shim installed at a surface of the plate which is opposite to the lining, and a second shim installed at a surface of the first shim which is opposite to the plate, a first hook overhanging at an outer circumferential edge section of the plate and hooked to the outer circumferential edge section of the plate is formed at the first shim, a second hook is formed at the second shim at a place at which it faces the first hook (at an outer side of the first hook in a disk radial direction), and the second hook is configured to be hooked to a part of the plate with which the first hook does not come in contact.

In this way, the first hook of the first shim overhangs at the outer circumferential edge section of the plate to be hooked to the outer circumferential edge section. For this reason, resistance in the deviation direction of the first hook with respect to the plate can be increased, and deviation of the first hook from the plate can be suppressed. In addition, the second hook of the second shim is hooked to a part of the plate with which the first hook does not come in contact. For this reason, resistance in the deviation direction of the second hook with respect to the plate can be increased, and deviation of the second hook from the plate can be suppressed. That is, as a coefficient of friction therebetween when the first hook is hooked to the outer circumferential edge section of the plate is larger than a coefficient of friction therebetween when the first hook is hooked to the second hook, deviation of the second hook from the plate can be suppressed. Accordingly, droppage of the first shim and the second shim from the pad can be suppressed. In addition, as the first hook and the second hook are disposed to face each other, an engaging structure of the first hook and the second hook can be provided, and the structure can be partially used in common Accordingly, cost reduction can be achieved.

In addition, the second hook is formed to astride the first hook, and hooked to a corner section of the plate at the lining side. Accordingly, resistance in the deviation direction of the second hook with respect to the plate can be increased, and deviation from the plate can be further suppressed. Accordingly, droppage of the second shim from the pad can be further suppressed. In addition, since the second hook is hooked to the corner section at the lining side of the plate, the second hook comes in line contact with the plate.

Accordingly, a sliding resistance of the second hook in the surface direction of the plate can be decreased. Accordingly, slidability of the second shim in the surface direction of the plate can be increased, and generation of abnormal sounds upon braking can be suppressed.

The second hook is formed to astride the first hook, and hooked to a surface of the plate at the lining side. Accordingly, resistance in the deviation direction of the second hook with respect to the plate can be further increased, and deviation from the plate can be further suppressed.

The first hook is divided into two divided sections, and the second hook is disposed between the two divided sections. Accordingly, the second hook is disposed between the two divided sections of the first hook. For this reason, interference between the first hook and the second hook can be suppressed. Accordingly, a degree of geometric freedom of the first hook and the second hook can be increased.

The contact type sensor is installed at the plate and is configured to come in contact with the disk to generate a warning sound when the lining is abraded and a distance between the disk and the plate in the disk axial direction arrives at a predetermined value, and the front end section position of the second hook in the disk axial direction is disposed closer to the plate than a front end section position of the contact type sensor. Accordingly, contact of the second hook with the disk before the contact type sensor generates a warning sound can be suppressed. Accordingly, damage to the second shim can be suppressed.

The second hook is installed at a central position of the pad in a disk tangential direction. Accordingly, the second hook can be appropriately slid in both directions in the disk tangential direction. Accordingly, the second shim can be appropriately slid in both directions in the disk tangential direction. Accordingly, generation of abnormal sounds upon braking can be suppressed regardless of the rotation direction of the disk.

A width dimension W1of the second hook in the disk tangential direction is set to be smaller than a width dimension W2of a cutout portion in the disk tangential direction, and the second hook is hooked within a range of the cutout portion, the cutout portion being formed at the outer circumferential edge section of the plate. Accordingly, the second hook can be appropriately slid within the range of the cutout portion. Accordingly, slidability of the second shim can be increased, and generation of abnormal sounds upon braking can be suppressed.

Sliding restriction sections configured to abut the support member in the disk tangential direction and configured to restrict sliding of the second shim are installed at both sides of the second shim in the disk tangential direction, and a width dimension W3between the sliding restriction sections, a width dimension W4between the abutting surfaces formed in the disk tangential direction at both sides of the pad abut with the support member in the disk tangential direction, the width dimension W1of the second hook, and the width dimension W2of the cutout portion satisfy a relation of (W2−W1)≧(W4−W3). Accordingly, as the sliding restriction sections abut the support member before the second hook abuts the wall surface of the cutout portion, the second hook can be suppressed from abutting the wall surface of the cutout portion. Accordingly, application of the load to the second hook can be suppressed.

The metal surfaces of the first shim and the second shim come in contact with each other. Accordingly, since the second shim is more easily deviated from the first shim, a suppressed effect of droppage of the second shim from the pad can be increased by hooking the second hook of the second shim to a part of the plate with which the first hook does not come in contact.