JP2011033109A - Disk brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk brake capable of restraining the generation of an abnormal sound caused by a brake pad. <P>SOLUTION: A pad spring 23 includes pressing pieces 96, 98, and one pressing piece 96 abutting on one brake pad heavier in weight is set to have a larger energizing force in a disc turn-out direction than the other pressing piece 98 abutting on the other brake pad lighter in weight. Thus, a pair of the brake pads different in weight can be pressed properly by the pad spring 23. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a disc brake for braking a vehicle.

  A disk brake for vehicle braking is a brake that makes a brake pad contact with a disk that rotates together with a wheel and brakes by its frictional resistance. In order to prevent rattling and the like, the brake pad is normally urged in the disk radial direction by a pad spring. There is also a pad spring that urges the brake pad toward the disc rotation direction outlet side (outward side) when the vehicle moves forward in order to prevent noise during braking.

  Depending on the type of disc brake, the brake pad arranged on one side in the axial direction of the disc and the brake pad arranged on the other side in the axial direction of the disc may have different back metal shapes. It is comprised so that a brake pad may be urged | biased similarly in the axial direction both sides (for example, refer patent document 1).

JP 2000-249175 A

  However, when one brake pad is larger in weight than the other brake pad due to a difference in the shape of the back metal, etc., if the structure is such that the pad spring biases them as described above, these brake pads May not be pressed properly. That is, when the pad spring is set to the side with the smaller weight, the pressing force is insufficient, and the brake pad on the side with the larger weight may be rattled, which may cause abnormal noise. On the other hand, when the weight is adjusted to the larger side, the pressing force is excessive, and the sliding performance of the brake pad on the lower weight side is reduced and dragging may occur. There is.

  Therefore, an object of the present invention is to provide a disc brake capable of suppressing the generation of abnormal noise due to a brake pad.

  To achieve the above object, according to the present invention, of the pressing pieces of the pad spring, one pressing piece that comes into contact with one brake pad having a large weight is the other pressing piece that comes into contact with the other brake pad having a small weight. The urging force in the direction of turning out the disc is larger than that.

  According to the present invention, it is possible to suppress the generation of abnormal noise due to the brake pad.

It is a bottom view which shows the disc brake of 1st Embodiment which concerns on this invention. It is a front sectional view which meets the X1-X1 line of Drawing 1 showing the disc brake of a 1st embodiment concerning the present invention. It is a front sectional view which meets the X2-X2 line of Drawing 1 which shows the disc brake of a 1st embodiment concerning the present invention. It is a plane sectional view showing the caliper body of the disc brake of a 1st embodiment concerning the present invention. It is the side view seen from the disk entrance side which shows the pad spring of the disk brake of 1st Embodiment which concerns on this invention. It is the side view seen from the disk delivery side which shows the pad spring of the disk brake of 1st Embodiment which concerns on this invention. It is the figure seen from the inner side which shows the pad spring of the disc brake of 1st Embodiment which concerns on this invention. It is the figure seen from the outer side which shows the pad spring of the disc brake of 1st Embodiment which concerns on this invention. It is the figure seen from the inner side which shows the pad spring of the disc brake of 2nd Embodiment which concerns on this invention. It is a top view which shows the pad spring of the disc brake of 2nd Embodiment which concerns on this invention. It is a front sectional view showing a disc brake of a second embodiment according to the present invention. It is a front sectional view showing a disc brake of a 3rd embodiment concerning the present invention. It is the figure seen from the inner side which shows the pad spring of the disc brake of 4th Embodiment which concerns on this invention. It is a front sectional view showing a disc brake of a 4th embodiment concerning the present invention.

“First Embodiment”
A disc brake according to a first embodiment of the present invention will be described below with reference to FIGS.

  The disc brake of the first embodiment is a disc brake for a motorcycle. As shown in FIG. 1 to FIG. 3, the disc brake 11 includes a disc 12 that rotates together with an unillustrated wheel of a vehicle that is a brake target, and an outer side that is one side of the disc 12 (the side opposite to the wheel). A mounting bracket 13 disposed and fixed to a non-rotating portion of the vehicle; and a caliper 16 slidably supported on the mounting bracket 13 by a guide pin 14 and a main pin 15 fixed to the mounting bracket 13. ing. 1 to 3, the rotation direction of the disk at the time of forward braking of the vehicle is indicated by an arrow R, and the following description will be given with the inlet side in this rotation direction being the disk inlet side and the outlet side being the disk outlet side. I do.

  The disc brake 11 of the first embodiment is slidably supported by a main pin 15 fixed to the mounting bracket 13 and a pad pin 20 fixed to the caliper 16, as shown in FIG. Slidably supported by a brake pad (one brake pad) 21 arranged on the inner side (wheel side) which is the side, and a pad pin 20 fixed to the mounting bracket 13 and the caliper 16 as shown in FIG. The brake pad (the other brake pad) 22 disposed on the outer side that is one side of the disk 12 and the caliper 16 are engaged, and the pair of brake pads 21 and 22 are urged at least inward in the disk radial direction. The brake pad 2 on the outer side attached to the pad spring 23 and the mounting bracket 13 A pad guide 24 for guiding the, the boot 25 shown in FIG. 1 covering the guide pins 14, and a boot 26 for covering the main pin 15.

  The mounting bracket 13 has a bracket body 30 formed of a sheet metal from a plate material. The bracket body 30 includes a base portion 31 extending in the disk rotation direction and a disk of the base portion 31 as shown in FIG. And an extending portion 32 that extends downward from the end on the delivery side, which is outward in the radial direction of the disk. A mounting hole 33 is formed in the base portion 31 at the end on the disk feed-in side, and a mounting hole 34 is formed in the disk feed-out side, that is, at the end on the extension portion 32 side, penetrating in the disk axial direction. . The mounting bracket 13 is fixed to a non-rotating portion of the vehicle with a mounting bolt (not shown) in which a fixing portion 35 around the mounting hole 33 and a fixing portion 36 around the mounting hole 34 are inserted into the mounting holes 33 and 34, respectively. Is done.

  The bracket body 30 has a guide pin mounting hole 40 slightly on the disk delivery side of the base part 31 than the fixed part 35 on the disk entry side, on the outer side of the extension part 32 in the disk radial direction, that is, on the lower end. A main pin mounting hole 41 having a diameter larger than that of the guide pin mounting hole 40 is formed so as to penetrate in the disk axial direction. The guide pin 14 is fixed to the guide pin mounting hole 40 on the disk entry side so as to protrude only on the side opposite to the disk 12 (outer side) along the disk axial direction. The main pin mounting hole 41 has a diameter larger than that of the guide pin 14 so as to protrude along the disk axis direction to the disk 12 side (inner side) and the side opposite to the disk 12 (outer side). The pin 15 is fixed. The main pin 15 is arranged on the outer side in the radial direction of the disk 12 and protrudes beyond the disk 12 from the outer side (upper side in FIG. 1) to the inner side (lower side in FIG. 1) as shown in FIG. ing. As shown in FIG. 3, the mounting bracket 13 includes a bracket body 30, guide pins 14, and a main pin 15.

  The bracket main body 30 is formed with a guide protrusion 44 that protrudes outward in the disk radial direction from the base part 31 on the disk insertion side slightly from the guide pin mounting hole 40 on the outer side in the disk radial direction of the base part 31. In addition, a guide protrusion 45 that protrudes from the extending portion 32 to the disk insertion side is formed on the disk insertion side of the extension portion 32 on the base portion 31 side. The pad guide 24 described above is attached to the guide protrusion 45.

  The caliper 16 includes a caliper body 50 that is slidably attached to the guide pin 14 and the main pin 15 of the mounting bracket 13 while straddling the disc 12, a piston 51 that is slidably provided on the caliper body 50, and a caliper body. 50 and the pad pin 20 described above.

  The caliper body 50 is integrally formed by casting. As shown in FIG. 1, the caliper body 50 has a cylinder part 52 disposed on the outer side of the mounting bracket 13 and a disk 12 from the lower part of the cylinder part 52 on the outer side in the disk radial direction. A bridge portion 53 that extends to the inner side so as to exceed the radially outer side, and a claw portion 54 that extends from the inner side end of the bridge portion 53 to the inner side in the radial direction of the disk 12 so as to face the cylinder portion 52. And have.

  As shown in FIG. 2, the cylinder portion 52 is slidably fitted with a sliding guide portion 57 for slidably fitting the guide pin 14 on the disk feed-in side and the main pin 15 on the disk feed-out side. And a cylinder body 59 between the slide guides 57 and 58 for holding the piston 51 in a slidable manner. As shown in FIG. 4, a bore 60 that opens toward the claw 54 is formed in the cylinder body 59 along the disk axial direction. In the bore 60, the piston 51 is placed as shown in FIG. 3. Mated.

  The bridge portion 53 has a recess 63 that is recessed outward in the disk radial direction inside the disk radial direction. The recess 63 has a bottom surface 64 that extends in a direction orthogonal to a disk radial direction line passing through the center of the bore 60, and a peripheral wall surface 65 that rises from the periphery of the bottom surface 64 along the disk radial direction. The side opposite to the bottom surface 64 of 65 has a shape that expands toward the inner side in the disk radial direction. The bridge portion 53 is formed with a through hole 67 penetrating from the bottom surface 64 of the recess 63 along the disk radial direction. Further, the pad pin 20 described above is installed on the cylinder portion 52 and the claw portion 54 so as to penetrate the concave portion 63 of the bridge portion 53 in the disk axial direction. When viewed from the disk axial direction, the pad pin 20 is arranged on a line in the disk radial direction passing through the center of the bore 60, and the claw part 54 and the bridge part 53 have a mirror surface shape around the line. There is no.

  As shown in FIG. 1, the caliper 16 has a claw portion 54 disposed on the side opposite to the disk 12 of the inner brake pad 21, and the disk of the outer brake pad 22 as shown in FIG. The piston 51 is arranged on the opposite side of the piston 12, and when the piston 51 advances toward the claw 54 by the brake fluid pressure introduced into the cylinder 52, the piston 51 moves the brake pad 22 on the outer side to the disc. 12, the guide pin 14 and the main pin 15 are slid by the reaction force, and the brake pad 21 on the inner side is pressed against the disk 12 by the claw portion 54. As a result, the brake pads 21 and 22 are brought into contact with the disk 12, and the disk 12 is braked by its frictional resistance.

  As shown in FIG. 2, the inner brake pad 21 includes a friction material 71 that contacts the disk 12 to generate a frictional resistance, and a plate-like back metal 72 that holds the friction material 71.

  The back metal 72 includes a main plate portion 73 to which the friction material 71 is fixed, an end protruding portion 74 that protrudes outward (downward) in the disk radial direction from the main plate portion 73, and a disk diameter of the main plate portion 73. An intermediate protrusion 75 protruding outward in the disk radial direction from the center position in the disk rotation direction on the outer side in the direction of the disk, and protrudes outward in the disk radial direction from the disk insertion side than the intermediate protrusion 75 on the outer side of the main plate 73 in the disk radial direction. And a pressed protrusion 77 that protrudes outward in the disk radial direction from the disk delivery side with respect to the intermediate protrusion 75 on the outer side of the main plate 73 in the disk radial direction. The pressed protrusions 76 and 77 have the same distance from the intermediate protrusion 75 and have a mirror surface shape.

  The tip end of the pressed projection 76 on the disk entry side is on the disk entry side, and the inclined surface 76a is inclined so as to be located on the inner side in the disk radial direction toward the end in the disk rotation direction, and the inclined surface 76a. And an inclined surface 76b that is inclined so as to be located on the inner side in the radial direction of the disk toward the end in the disk rotation direction. A boundary portion between the inclined surfaces 76a and 76b is pressed. The protrusion 76 is a top 76c located on the outermost side in the disk radial direction. When the reference plane is a plane orthogonal to the disk radial direction line passing through the center of the bore 60 and passing through the top portion 76c, the angle formed by the inclined surface 76a on the disk entry side and the reference surface is the inclined surface on the disk delivery side. It is larger than the angle formed by 76b and the reference plane.

  The tip end of the pressed protrusion 77 on the disk delivery side is on the disk delivery side, and an inclined surface 77a is inclined so as to be located on the inner side in the disk radial direction toward the end in the disk rotation direction. And an inclined surface 77b that is inclined so as to be located on the inner side in the disk radial direction toward the end in the disk rotation direction. The boundary portion between these inclined surfaces 77a and 77b is pressed. The protrusion 77 is the top 77c located on the outermost side in the disk radial direction. When a plane perpendicular to a line in the disk radial direction passing through the center of the bore 60 and passing through the top 77c is used as a reference plane, an angle formed by the inclined surface 77a on the disk delivery side and the reference plane is an inclined surface on the disk entry side. It is larger than the angle between 77b and the reference plane.

  A substantially rectangular main pin hole 78 through which the main pin 15 is inserted is formed in the end protrusion 74 so as to penetrate in the disk axial direction, and a horizontally long pad pin hole through which the pad pin 20 is inserted is formed in the intermediate protrusion 75. 79 is formed penetrating in the disk axial direction. The brake pad 21 on the inner side is slidably supported on the mounting bracket 13 and the caliper 16 by the main pin 15 and the pad pin 20 with the friction material 71 on the disk 12 side and the back metal 72 on the claw portion 54 side. Yes.

  As shown in FIG. 3, the outer brake pad 22 also includes a friction material 81 that contacts the disk 12 to generate frictional resistance, and a plate-like back metal 82 that holds the friction material 81.

  The back metal 82 includes a main plate portion 83 to which the friction material 81 is fixed, an end protruding portion 84 that protrudes from the outer side of the main plate portion 83 in the radial direction of the disc toward the disc delivery side, and a disc that is radially inward of the main plate portion 83. An inner protrusion 85 that protrudes inward (upward) in the disk radial direction from the turn-in side, and an intermediate protrusion that protrudes outward (downward) in the disk radial direction from the central position in the disk rotation direction outside the main plate 83 in the disk radial direction. 86, a pressed protrusion 87 that protrudes outward in the disk radial direction from the disk insertion side with respect to the intermediate protrusion 86 on the outer side in the disk radial direction of the main plate part 83, and an intermediate protrusion on the outer side in the disk radial direction of the main plate part 83 And a pressed projection 88 that protrudes outward in the radial direction of the disk from the disk delivery side than 86. The pressed protrusions 87 and 88 have the same distance from the intermediate protrusion 86 and have a mirror surface shape.

  The tip of the pressed protrusion 87 on the disk insertion side is an inclined surface 87a that is inclined so as to be located on the inner side in the disk radial direction toward the end in the disk rotation direction on the disk insertion side. And an inclined surface 87b which is inclined so as to be located on the inner side in the disk radial direction toward the end in the disk rotation direction, and the boundary portion between these inclined surfaces 87a and 87b is pressed. The projection 87 is a top 87c located on the outermost side in the disk radial direction. When the reference plane is a plane orthogonal to the disk radial direction line passing through the center of the bore 60 and passing through the top portion 87c, the angle formed between the inclined surface 87a on the disk entry side and the reference surface is the inclined surface on the disk delivery side. It is larger than the angle between 87b and the reference plane.

  The tip end of the pressed protrusion 88 on the disk delivery side is an inclined surface 88a that is inclined to be located on the inner side in the disk radial direction toward the end in the disk rotation direction on the disk delivery side, and the inclined surface 88a. And an inclined surface 88b which is inclined so as to be located on the inner side in the disk radial direction toward the end in the disk rotation direction, and the boundary portion between these inclined surfaces 88a and 88b is pressed. The protrusion 88 is a top 88c located on the outermost side in the disk radial direction. When the reference plane is a plane perpendicular to the disk radial direction line passing through the center of the bore 60 and passing through the top portion 88c, the angle formed between the inclined surface 88a on the disk delivery side and the reference surface is the inclined surface on the disk entry side. It is larger than the angle formed by 88b and the reference plane.

  A laterally long pad pin hole 89 through which the pad pin 20 is inserted is formed in the intermediate protrusion 86 so as to penetrate in the disk axial direction. The brake pad 22 on the outer side is slidably supported by the caliper 16 by the pad pin 20 with the friction material 81 disposed on the disk 12 side and the back metal 82 disposed on the cylinder portion 52 side. Note that the outer side brake pad 22 has an end protruding portion 84 that contacts the outer side in the disk radial direction of the pad guide 24 attached to the guide protrusion 45 of the mounting bracket 13 and an end of the main plate portion 83 on the disk supply side. The end surfaces excluding the protrusions 84 abut against the disk insertion side of the pad guide 24, and the inner protrusions 85 abut against the surface of the guide protrusion 44 of the mounting bracket 13 on the disk extraction side, The guide projection 44 guides the sliding.

  Here, the friction material 71 of the brake pad 21 on the inner side shown in FIG. 2 and the main plate portion 73 of the back metal 72, the intermediate protrusion 75, and the pressed protrusions 76 and 77 are the brake pads 22 on the outer side shown in FIG. The friction material 81 and the main plate 83 of the back metal 82, the intermediate protrusion 86, and the pressed protrusions 87 and 88 have the same shape (that is, the same volume) and the same weight. On the other hand, the volume of the end protrusion 74 of the back metal 72 of the inner brake pad 21 shown in FIG. 2 is equal to the end protrusion 84 and the inner protrusion of the back metal 82 of the outer brake pad 22 shown in FIG. As a result, the pair of brake pads 21 and 22 provided on both surfaces of the disk 12 has a weight of one inner brake pad 21 shown in FIG. It is larger than the weight of the brake pad 22 on the other outer side shown. 2, the main plate portion 73, the intermediate projecting portion 75, and the pressed projection portions 76, 77 of the inner side brake pad 21, and the main plate portion 83, the intermediate projecting portion 86 of the outer side brake pad 22 shown in FIG. Since the pressed protrusions 87 and 88 have the same shape, the above-described reference surface is the same surface.

  As shown in FIG. 2, the pad spring 23 is in contact with the bottom surface 64 of the concave portion 63 of the caliper 16 to be engaged with the caliper 16, and the inner side of the engagement portion 95 on the disk insertion side. A pressing piece 96 that extends obliquely from the end in the disk radial direction and toward the disk insertion side and contacts the pressed protrusion 76 on the disk insertion side of the brake pad 21 on the inner side, and the inner side of the locking part 95 A pressing piece 97 that extends obliquely from the end of the disc delivery side to the inside of the disc in the radial direction of the disc and toward the delivery side of the disc and abuts against a pressed projection 77 on the disc delivery side of the inner brake pad 21. is doing.

  Further, as shown in FIG. 3, the pad spring 23 extends obliquely from the end on the outer side of the engaging portion 95 on the disc insertion side to the inner side in the radial direction of the disc and toward the disc insertion side. 22, a pressing piece 98 that contacts the pressed protrusion 87 on the disk feed-in side, and an end on the disk feed-out side on the outer side of the engaging part 95 that extends obliquely inward in the disk radial direction and toward the disk feed-out side. And a pressing piece 99 that comes into contact with the pressed protrusion 88 on the disk delivery side of the brake pad 22 on the outer side.

  That is, the pad spring 23 has, for each brake pad 21, 22, two pressing pieces 96, 97 that urge the brake pad 21 and two pressing pieces 98, 99 that urge the brake pad 22, The pressing pieces 96 to 99 are formed in four parts extending from the engaging portion 95 of the pad spring 23 to the caliper 16 on both sides in the rotational direction of the disk 12.

  The pad spring 23 has a shape shown in FIGS. 5 to 8 when in a natural state.

  The locking portion 95 of the pad spring 23 includes a substantially rectangular substrate portion 102 and a locking plate portion that extends obliquely outward in the length direction and in the thickness direction from one end edge in the length direction of the substrate portion 102. 103 and a locking plate portion 104 extending obliquely outward in the length direction and in the plate thickness direction from the other end edge of the substrate portion 102 in the length direction. As shown in FIG. 4, the pad spring 23 is locked to the claw portion 54 side of the peripheral wall portion 65 with the base plate portion 102 in contact with the bottom surface 64 of the caliper body 50. Then, the locking plate portion 104 is locked to the cylinder portion 52 side of the peripheral wall portion 65. The locking portion 95 has a mirror-symmetric shape in the width direction of the substrate portion 102.

  As shown in FIG. 5 and FIG. 7, the pressing piece 96 forms a predetermined obtuse angle with the substrate portion 102 from one side in the length direction of one end edge in the width direction of the substrate portion 102, in the width direction of the substrate portion 102. A first plate portion 108 extending linearly obliquely outward and to one side in the plate thickness direction, and inclined at a predetermined obtuse angle larger than that of the first plate portion 108 with respect to the substrate portion 102 from the tip of the first plate portion 108 The second plate portion 109 extending linearly diagonally outward in the width direction of the substrate portion 102 and on one side in the plate thickness direction, and the first plate portion 108 with respect to the substrate portion 102 from the tip of the second plate portion 109. A third plate portion 110 that is inclined at a predetermined obtuse angle that is larger than the second plate portion 109 and extends obliquely linearly outwardly in the width direction of the substrate portion 102 and on one side in the plate thickness direction; The tip plate portion that protrudes obliquely from the tip of the three plate portions 110 outward in the width direction of the substrate portion 102 and on the opposite side in the plate thickness direction 11, and a regulating plate portion 112 that protrudes inward in the width direction of the third plate portion 110 pressing piece 98 side of the edge from the vertical substrate portion 102 of the.

  As shown in FIGS. 6 and 7, the pressing piece 97 is linearly inclined from one side in the length direction of the other end edge in the width direction of the substrate portion 102 to the outside in the width direction and one side in the plate thickness direction. A first plate portion 115 extending to the substrate portion 102 and inclined from the front end of the first plate portion 115 with respect to the substrate portion 102 at a predetermined obtuse angle larger than that of the first plate portion 115 and outward in the width direction of the substrate portion 102 and with a plate thickness. A second plate portion 116 extending linearly diagonally to one side in the direction, and a front plate portion 117 projecting obliquely outward from the front end of the second plate portion 116 in the width direction and opposite to the plate thickness direction. And a regulating plate portion 118 that protrudes perpendicularly from the end edge portion of the second plate portion 116 on the pressing piece 99 side to the opposite side of the substrate portion 102.

  Here, the first plate portion 108 of the pressing piece 96 and the first plate portion 115 of the pressing piece 97 have the same angle with the substrate portion 102. On the other hand, the angle formed between the second plate portion 109 of the pressing piece 96 and the substrate portion 102 is smaller than the angle formed between the second plate portion 116 of the pressing piece 97 and the substrate portion 102. The angle formed between the third plate portion 110 and the substrate portion 102 is further smaller than the angle formed between the second plate portion 116 and the substrate portion 102. Further, the height from the substrate portion 102 to the tip of the first plate portion 108 of the pressing piece 96 is smaller than the height from the tip of the first plate portion 115 of the pressing piece 97 to the height from the substrate portion 102. In the direction, the second plate portion 116 of the pressing piece 97 is aligned with the third plate portion 110 of the pressing piece 96. Thus, the pressing piece 96 and the pressing piece 97 are asymmetrical.

  As shown in FIGS. 5 and 8, the pressing piece 98 is linearly inclined diagonally from the other side in the length direction of one end edge of the substrate portion 102 to the outside in the width direction and one side in the plate thickness direction. The first plate portion 121 extending, and the substrate portion 102 is inclined at a predetermined obtuse angle larger than the first plate portion 121 from the front end of the first plate portion 121 to the outside in the width direction of the substrate portion 102 and in the plate thickness direction. A second plate part 122 extending obliquely in a straight line on one side, and a tip plate part 123 projecting obliquely outward from the tip of the second plate part 122 in the width direction of the substrate part 102 and on the opposite side in the plate thickness direction; have. The angle relationship, height relationship, and length relationship of the first plate portion 121 and the second plate portion 122 with respect to the substrate portion 102 of the pressing piece 98 are the same as those of the pressing piece 97.

  As shown in FIGS. 6 and 8, the pressing piece 99 is linearly inclined from the other side in the length direction of the other end edge of the substrate portion 102 in the width direction to the outside in the width direction and one side in the plate thickness direction. A first plate portion 126 extending to the substrate portion 102, and a predetermined obtuse angle larger than that of the first plate portion 126 with respect to the substrate portion 102 from the front end of the first plate portion 126, outward in the width direction of the substrate portion 102 and with a plate thickness. A second plate portion 127 extending obliquely linearly on one side in the direction, and a front end plate portion 128 projecting obliquely outward in the width direction of the substrate portion 102 and on the opposite side in the plate thickness direction from the front end of the second plate portion 127. And have. The angle relationship, height relationship, and length relationship of the first plate portion 126 and the second plate portion 127 with respect to the substrate portion 102 of the pressing piece 99 are the same as those of the pressing piece 97. Thereby, the pressing piece 98 and the pressing piece 99 are mirror-symmetrical.

  As shown in FIGS. 5 and 6, the pressing pieces 96 to 99 are connected to each other on the substrate 102 side of the first plate portions 108 and 121, and are also connected to the substrate portion 102 side of the first plate portions 115 and 126. ing. Further, the pressing pieces 96 to 99 have the same width at the intermediate portion between the first plate portions 108, 115, 121 and 126. On the other hand, the width of the distal end side including the second plate portion 109 and the third plate portion 110 of the inner side pressing piece 96 and the width of the distal end side including the second plate portion 116 of the pressing piece 97 are set on the outer side. The width of the front end side including the second plate portion 122 of the pressing piece 98 and the width of the front end side including the second plate portion 127 of the pressing piece 99 are narrower.

  When the pad spring 23 is assembled to the caliper 16, as shown in FIG. 2, the pressing piece 96 on the disk insertion side and the inner side is slightly bent outward in the disk radial direction in the third plate portion 110. The second plate portion 116 is brought into contact with the inclined surface 76a of the pressed protrusion 76 of the inner brake pad 21 and the disc feeding side and inner side pressing piece 97 is slightly bent outward in the disc radial direction. In this case, it comes into contact with the top 77c of the pressed projection 77 of the brake pad 21. Further, as shown in FIG. 3, the top portion of the pressed protrusion 87 of the brake pad 22 on the outer side of the second plate portion 122 while the pressing piece 98 on the disk insertion side and the outer side is slightly bent outward in the radial direction of the disk. The pressing piece 99 on the disk delivery side and the outer side comes into contact with the top portion 88c of the pressed projection 88 of the brake pad 22 at the second plate portion 127 while slightly bending outward in the disk radial direction. It will be. At this time, the restricting plate portion 112 of the inner side pressing piece 96 and the restricting plate portion 118 of the pressing piece 97 shown in FIG. 7 correspond to the pressed protrusions 76 and 77 of the inner side brake pad 21 shown in FIG. It contacts the disk 12 side.

  Here, since the third plate portion 110 of the pressing piece 96 abuts on the inclined surface 76a of the pressed protrusion 76, the third plate portion 110 is inclined at a relatively large angle with respect to the above-described reference surface, and is indicated by an arrow F1. As described above, the brake pad 21 is pressed in the direction radially inward of the disk and on the disk delivery side and relatively inclined toward the disk delivery side.

  On the other hand, the second plate portion 116 of the pressing piece 97 abuts on the top portion 77c of the pressed protrusion 77 and is inclined in the opposite direction at a smaller angle than the pressing piece 96 with respect to the reference surface. Then, as indicated by an arrow F2, the brake pad 21 is pressed with a spring force equivalent to that of the pressing piece 96 in the direction radially inward of the disk and in the direction of relatively small inclination toward the disk insertion side. .

  As shown in FIG. 3, the second plate portion 122 of the pressing piece 98 abuts on the top portion 87 c of the pressed protrusion 87, and therefore the same direction at a smaller angle than the pressing piece 96 with respect to the reference surface described above. As shown by the arrow F3, the brake pad has a spring force equivalent to that of the pressing piece 97 in the direction radially inward of the disk and in the direction of relatively small inclination toward the disk delivery side. 22 is pressed.

  Further, the second plate portion 127 of the pressing piece 99 is in contact with the top portion 88c of the pressed protrusion 88, and is opposite to the above-described reference plane at the same angle as the pressing piece 98 (the same angle as the pressing piece 97). The same direction as the pressing pieces 97 and 98 in the direction of the inner side of the disk radial direction and the direction of relatively small inclination on the disk insertion side, as indicated by the arrow F4. The inner brake pad 21 is pressed by the spring force.

  A resultant force of the pressing force of the pressing piece 96 and the pressing force of the pressing piece 97 is applied to the brake pad 21 on the inner side, and the pressing force of the pressing piece 98 and the pressing piece 99 of the pressing piece 99 are applied to the brake pad 22 on the outer side. A resultant force of pressing force is applied. As described above, in the pad spring 23, the pressing piece 96 positioned on the disk insertion side among the pressing pieces 96 and 97 contacting the inner brake pad 21 having a large weight is the outer brake having a small weight. The contact angle of the inner side brake pad 21 with respect to the pressing piece 98 located on the disk insertion side of the pressing pieces 98 and 99 contacting the pad 22 so that the urging force in the disk unwinding direction is increased. Is different from the contact angle of the pressing piece 98 to the brake pad 22 on the outer side. Then, of the pressing pieces 96 and 97 that contact the inner brake pad 21, the pressing angle of the pressing piece 97 positioned on the disk delivery side to the inner brake pad 21 and the outer brake pad 22 correspond to each other. Of the pressing pieces 98 and 99 that are in contact with each other, the contact angle of the pressing piece 99 located on the disk delivery side to the brake pad 22 on the outer side is the same, and the urging force of the pressing pieces 97 and 99 in the disk delivery direction is Therefore, the pressing pieces 96 and 97 that contact the brake pad 21 on the inner side, which has a large weight, of the pressing pieces 96 to 99 of the pad spring 23 contact the brake pad 22 on the outer side, which has a small weight. The urging force in the disc unwinding direction is larger than the pressing pieces 98 and 99 that are in contact with each other.

  2 is pressed by the resultant force of the pressing force of the pressing piece 96 and the pressing force of the pressing piece 97. As a result, the pad pin hole 79 is pressed against the pad pin 20, and the main pin 15 is pressed. The main pin hole 78 is pressed. 3 is pressed by the resultant force of the pressing force of the pressing piece 98 and the pressing force of the pressing piece 99. As a result, the pad pin hole 89 is pressed against the pad pin 20, and the end portion of the pad guide 24 is pressed. The protrusion 84 is pressed.

  In the disc brake 11 described above, when the brake fluid pressure is introduced into the cylinder portion 52 of the caliper 16 and the piston 51 advances to the claw portion 54 side, the piston 51 presses the brake pad 22 on the outer side against the disc 12. At that time, while the outer brake pad 22 is pressed by the pressing pieces 98 and 99 of the pad spring 23, the pad pin hole 89 is guided to the pad pin 20 and the end protrusion 84 is guided to the pad guide 24. Then, the inner protrusion 85 is guided by the guide protrusion 44 and slides with respect to the mounting bracket 13. On the other hand, the caliper 16 slides on the guide pin 14 and the main pin 15 by the reaction force received by the piston 51 and presses the brake pad 21 on the inner side against the disk 12 by the claw portion 54. While the brake pad 21 is pressed by the pressing pieces 96, 97 of the pad spring 23, the main pin hole 78 is guided to the main pin 15, the pad pin hole 79 is guided to the pad pin 20, and slides on the mounting bracket 13. To do. In this way, the caliper 16 brings the brake pads 21 and 22 into contact with the disk 12 and brakes the disk 12 by its frictional resistance.

  According to the first embodiment described above, of the pressing pieces 96 to 99 of the pad spring 23, the pressing pieces 96 and 97 that come into contact with the brake pad 21 on the inner side having a large weight are the brakes on the outer side having a small weight. Since the urging force in the disc feeding direction is larger than the pressing pieces 98 and 99 abutting against the pad 22, the main pin hole 78 of the brake pad 21 on the inner side, which is heavy in weight, is pushed out to the main pin 15. It can be pressed to the side with great force. Thereby, the rattling of the brake pad 21 that tends to occur as the weight increases can be suppressed. Therefore, wear of the main pin 15 can be suppressed, and abnormal noise and brake noise can be suppressed. On the other hand, the pressing pieces 98 and 99 of the pad spring 23 do not generate a large pressing force in the disk rotation direction against the outer brake pad 22 that is small in weight and slides with the caliper 16 during braking. Drag can be suppressed without lowering the mobility. Thus, the pair of brake pads 21, 22 having different weights can be appropriately pressed by the pad spring 23. For this reason, generation | occurrence | production of the noise by the rattling of the brake pad 21 or dragging of the brake pads 21 and 22 can be suppressed.

  Further, the pad spring 23 has a pressing piece 96 positioned on the disk insertion side among the pressing pieces 96 and 97 that contact the brake pad 21 on the inner side having a large weight abuts on the brake pad 22 on the outer side having a small weight. The abutment angle of the inner side brake pad 21 is such that the urging force in the disk unwinding direction is increased with respect to the pressing piece 98 positioned on the disk insertion side of the pressing pieces 98 and 99. Since the contact angle with the brake pad 22 on the outer side is different, the pair of brake pads 21 and 22 having different weights can be appropriately pressed with a simple configuration. For this reason, generation | occurrence | production of the noise by the rattling of the brake pad 21 or dragging of the brake pads 21 and 22 can be suppressed.

  In addition, the pad spring 23 is a disk rotation of the pressing piece 96 located on the disk insertion side far from the main pin 15 that is the restraint center among the pressing pieces 96 and 97 that abut the heavy inner brake pad 21. Since the urging force in the outward direction is increased, the moment generated is increased, and the main pin hole 78 of the brake pad 21 on the inner side can be efficiently and stably pressed against the main pin 15. For this reason, generation | occurrence | production of the abnormal noise (what is called a clonk noise) by the movement of the brake pad 21 at the time of the braking at the time of a vehicle advance can be suppressed.

“Second Embodiment”
Next, a second embodiment according to the present invention will be described mainly on the difference from the first embodiment based on FIGS. In addition, about the site | part which is common in 1st Embodiment, it represents with the same name and the same code | symbol.

  In the second embodiment, only the pressing piece 96 on the disk insertion side and the inner side of the pad spring 23 is different from the first embodiment.

  The pad spring 23 of the second embodiment has the shape shown in FIGS. 9 and 10 when in a natural state.

  In the second embodiment, the pressing piece 96 has a predetermined obtuse angle close to orthogonal to the substrate portion 102 and extends linearly diagonally outward in the width direction of the substrate portion 102 and on one side in the plate thickness direction. The portion 131 and the front end of the first plate portion 131 are inclined with respect to the substrate portion 102 at a predetermined obtuse angle larger than that of the first plate portion 131, and obliquely linearly outward in the width direction of the substrate portion 102 and on one side in the plate thickness direction. A second plate portion 132 that extends in a shape, a tip plate portion 133 that obliquely protrudes outward from the tip of the second plate portion 132 in the width direction and opposite to the plate thickness direction, and the second plate portion 132. And a regulating plate portion 134 that protrudes perpendicularly from the edge portion on the pressing piece 98 side to the opposite side of the substrate portion 102.

  Accordingly, the first plate portion 131 of the pressing piece 96 is different from the first plate portions 115, 121, and 126 of the other pressing pieces 97 to 99 in the angle formed with the substrate portion 102, and The angle formed between the first plate portion 131 and the substrate portion 102 is smaller than the first plate portions 115, 121, and 126 of the other pressing pieces 97 to 99. On the other hand, the angle between the second plate portion 132 of the pressing piece 96 and the first plate portion 131 of the second plate portion 132 is the angle between the second plate portion 116 of the other pressing piece 97 and the first plate portion 115 of the pressing piece 98. The angle formed by the first plate portion 121 of the two plate portions 122 and the angle formed by the first plate portion 126 of the second plate portion 127 of the pressing piece 99 are the same. Further, the length of the first plate portion 131 of the pressing piece 96 is equivalent to the length of the first plate portions 115, 121, 126 of the other pressing pieces 97 to 99, and the length of the second plate portion 132 is also different. Are equal to the lengths of the second plate portions 116, 122, 127 of the pressing pieces 97-99. Thereby, the pressing piece 96 and the pressing piece 97 have an asymmetric shape in which only the angles of the first plate portions 131 and 115 with respect to the substrate portion 102 are different from the mirror-symmetric shape in the natural state.

  As shown in FIG. 11, when the pad spring 23 is assembled to the caliper 16, the pressing piece 96 on the disk insertion side and the inner side moves outward from the natural state shown by the two-dot chain line in FIG. The second plate portion 132 comes into contact with the top portion 76c of the pressed projection portion 76 of the inner brake pad 21 while being greatly bent (downward). On the other hand, the pressing piece 97 on the disk delivery side and the inner side is bent by a bending amount smaller than that of the pressing piece 96 outward in the radial direction of the disk while being pressed in the second plate portion 116 at the pressed protrusion 77 of the brake pad 21. It will contact | abut to the top part 77c. Similarly to FIG. 3 of the first embodiment, the pressed portion 98 of the brake pad 22 on the outer side in the second plate portion 122 while the pressing piece 98 on the disk insertion side and the outer side slightly bends outward in the radial direction of the disk. 87, and the pressing piece 99 on the disk delivery side and the outer side slightly bends outward in the radial direction of the disk, while the second plate portion 127 has a top portion 88c of the pressed projection 88 of the brake pad 22. Will abut.

  In such an attachment state, as shown in FIG. 11, the second plate portion 132 of the pressing piece 96 abuts on the top portion 76c, and has the same angle as the second plate portion 116 of the pressing piece 97 with respect to the reference surface described above. Will be inclined in the opposite direction, and will be inclined in the same direction at the same angle as the pressing piece 98 similar to FIG. 3 of the first embodiment, and the pressing piece 99 similar to FIG. 3 of the first embodiment. And tilt in the opposite direction at the same angle. That is, the pressing piece 96 and the pressing piece 97 are substantially mirror-symmetric in the attached state. As a result, the pressing force of the pressing piece 96 having a large amount of deflection is larger than the pressing force of the pressing piece 98, and the component directed inward in the disk radial direction and the component directed toward the disk delivery side are also increased.

  A resultant force of the pressing force of the pressing piece 96 and the pressing piece 97 is applied to the brake pad 21 on the inner side, and a resultant force of the pressing force of the pressing piece 98 and the pressing piece 99 is applied to the brake pad 22 on the outer side. It will be. As described above, of the pressing pieces 96 and 97 that contact the inner brake pad 21 having a large weight, the pressing piece 96 positioned on the disk insertion side contacts the outer brake pad 22 having a small weight. The pressing force on the brake pad 21 is applied to the brake pad 22 of the pressing piece 98 so that the urging force in the disk discharging direction is increased with respect to the pressing piece 98 located on the disk insertion side of the pressing pieces 98 and 99. The pressing force is different. Of the pressing pieces 96 and 97 that are in contact with the inner brake pad 21, the pressing force of the pressing piece 97 positioned on the disk delivery side to the brake pad 21 and the pressing piece 98 that is in contact with the outer brake pad 22 are provided. , 99 are equivalent to the pressing force of the pressing piece 99 located on the disk delivery side to the brake pad 22 and the urging force of the pressing pieces 97, 99 in the disk delivery direction is equivalent. Of the pressing pieces 96 to 99 of the pad spring 23, the pressing pieces 96 and 97 that contact the inner brake pad 21 having a large weight are more than the pressing pieces 98 and 99 that contact the outer brake pad 22 having a small weight. The urging force in the disk unwinding direction is large.

  According to the second embodiment described above, of the pressing pieces 96, 97 that contact the inner brake pad 21 having a large weight, the pressing piece 96 positioned on the disk insertion side has a smaller weight on the outer brake. The angle in the natural state is made different so that the urging force in the disk unwinding direction is increased with respect to the pressing piece 98 positioned on the disk insertion side among the pressing pieces 98 and 99 in contact with the pad 22. A pair of brake pads 21 and 22 having different weights can be appropriately pressed with a simpler configuration in which the natural angles of the pressing pieces 96 and 98 are made different. For this reason, generation | occurrence | production of the noise by the rattling of the brake pad 21 or dragging of the brake pads 21 and 22 can be suppressed.

“Third Embodiment”
Next, a third embodiment according to the present invention will be described mainly based on FIG. 12 with a focus on differences from the second embodiment. In addition, about the site | part which is common in 2nd Embodiment, it represents with the same name and the same code | symbol.

  In the third embodiment, the disc spring-side and inner-side pressing piece 96 of the pad spring 23 is different from that of the second embodiment. In addition, the inner-side brake pad 21 on the disc feed-in side is different. The pressed protrusion 76 is different from the second embodiment.

  In the pad spring 23 according to the third embodiment, the first plate portion 131 of the pressing piece 96 on the disk insertion side and the inner side has a first plate portion 115 of the pressing piece 97 against the substrate portion 102 in a natural state (not shown). The substrate portion 102 extends obliquely in a straight line to the outside in the width direction and on one side in the plate thickness direction at the same obtuse angle.

  Thereby, in 3rd Embodiment, the 1st board part 131 of the press piece 96 makes the angle which the board | substrate part 102 makes | forms, the 1st board part 115 of the other press piece 97, and the 1st plate part 115 of the other press pieces 98 and 99. It is equivalent to one plate portion 121, 126 (not shown in FIG. 12), and the pressing piece 96 and the pressing piece 97 have a mirror-symmetric shape in the natural state. That is, the entire pad spring 23 has a mirror-symmetric shape in the natural state.

  In contrast to the above, the amount of protrusion from the main plate portion 73 of the pressed protrusion 76 on the disk insertion side of the inner brake pad 21 is the same as that of the inner brake pad 21 on the disk supply side. The amount of protrusion of the pressing protrusion 77 from the main plate 73, the amount of protrusion of the pressed protrusion 87 on the disk insertion side of the brake pad 22 on the outer side from the main plate 83 (not shown in FIG. 12), and the brake on the outer side The pressing protrusion 88 (not shown in FIG. 12) on the disk delivery side of the pad 22 is larger than the protruding amount from the main plate 83.

  Then, as shown in FIG. 12, when the pad spring 23 is assembled to the caliper 16, the disk turning-in side and inner-side pressing piece 96 moves outward from the natural state shown by the two-dot chain line in FIG. The second plate portion 132 comes into contact with the top portion 76c of the pressed projection portion 76 of the inner brake pad 21 while being greatly bent (downward). On the other hand, the disk delivery side and inner side pressing piece 97 is bent outwardly in the disk radial direction with a smaller bending amount than the pressing piece 96 while the second plate portion 116 is pressed by the inner brake pad 21. It comes into contact with the top 77c of the protrusion 77. In addition, although not shown in FIG. 12, as in FIG. 3 of the first embodiment, the pressing piece 98 on the disk insertion side and the outer side slightly bends outward in the radial direction of the disk, while the second plate portion 122 has an outer side. The abutting portion 87c of the pressed projection 87 of the brake pad 22 comes into contact with the outer side brake of the second plate 127 while the disc feeding side and outer side pressing piece 99 slightly bends outward in the radial direction of the disc. The pad 22 comes into contact with the top 88c of the pressed protrusion 88. As a result, the pressing force of the pressing piece 96 becomes larger than the pressing force of the pressing piece 98, and the component facing inward in the radial direction of the disk and the component facing toward the disk delivery side also increase.

  A resultant force of the pressing force of the pressing piece 96 and the pressing piece 97 is applied to the brake pad 21 on the inner side, and a resultant force of the pressing force of the pressing piece 98 and the pressing piece 99 is applied to the brake pad 22 on the outer side. It will be. As described above, of the pressing pieces 96 and 97 that contact the inner brake pad 21 having a large weight, the pressing piece 96 positioned on the disk insertion side contacts the outer brake pad 22 having a small weight. Of the pressing pieces 98 and 99, the pressing force on the brake pad 21 is applied to the pressing pad 98 of the pressing piece 98 so that the urging force in the disk extending direction is increased with respect to the pressing piece 98 positioned on the disk insertion side. It is different from the pressing force to. Of the pressing pieces 96 and 97 that are in contact with the inner brake pad 21, the pressing force of the pressing piece 97 positioned on the disk delivery side to the inner brake pad 21 is in contact with the outer brake pad 22. Of the pressing pieces 98, 99, the pressing force of the pressing piece 99 positioned on the disk delivery side is equal to the pressing force to the brake pad 22 on the outer side, and the urging force of the pressing pieces 97, 99 in the disk delivery direction is equivalent. Therefore, of the pressing pieces 96 to 99 of the pad spring 23, the pressing pieces 96 and 97 that contact the brake pad 21 on the inner side having a large weight are the pressing pieces that contact the brake pad 22 on the outer side having a small weight. The urging force in the disk unwinding direction is larger than that of the pieces 98 and 99.

  According to the third embodiment described above, of the pressing pieces 96, 97 that abut on the inner brake pad 21 having a large weight, the pressing piece 96 positioned on the disk insertion side has a smaller weight on the outer brake. Of the pressing pieces 98 and 99 abutting on the pad 22, the inner side brake pad 21 on the disk insertion side of the brake pad 21 on the inner side is increased so as to increase the urging force in the disk unwinding direction. Since the protruding amount of the pressed protrusion 76 is different from the pressed protrusion 87 on the disk insertion side of the outer brake pad 22, the protruding amount of the pressed protrusion 76 is changed to the pressed protrusion 87. The pair of brake pads 21 and 22 having different weights can be appropriately pressed with a simple configuration that is different from each other. For this reason, generation | occurrence | production of the abnormal noise by rattling and dragging of the brake pad 21 can be suppressed.

“Fourth Embodiment”
Next, a fourth embodiment according to the present invention will be described mainly on the difference from the first embodiment based on FIG. 13 and FIG. In addition, about the site | part which is common in 1st Embodiment, it represents with the same name and the same code | symbol.

  In the fourth embodiment, only the pressing piece 97 on the disk delivery side and the inner side of the pad spring 23 is different from the first embodiment.

  The pad spring 23 of the fourth embodiment has a shape shown in FIG. 13 when in a natural state.

  The disk feeding side and inner side pressing piece 97 forms a predetermined obtuse angle with respect to the substrate part 102, which is larger than the first plate parts 108, 121, 126 of the other pressing pieces 96, 98, 99. A first plate part 141 extending linearly diagonally outward in the width direction and on one side in the plate thickness direction, and substantially perpendicular to the substrate unit 102 from the tip of the first plate unit 141 to the one side in the plate thickness direction. A second plate portion 142 that extends linearly, and an outer side in the width direction of the substrate portion 102 that is inclined with respect to the substrate portion 102 at a predetermined obtuse angle larger than the first plate portion 141 from the tip of the second plate portion 142. And a third plate portion 143 obliquely extending linearly to one side in the plate thickness direction, and linearly outward in the width direction of the substrate portion 102 from the front end of the third plate portion 143 to be substantially parallel to the substrate portion 102. The fourth plate portion 144 extending in the direction perpendicular to the edge of the fourth plate portion 144 on the pressing piece 99 side. 102 and a restricting plate 145 that protrudes on the opposite side of the.

  Then, as shown in FIG. 14, when the pad spring 23 is assembled to the caliper 16, as in the first embodiment, the pressing piece 96 on the disk insertion side and the inner side is outward (downward) in the disk radial direction. While slightly bent, the third plate portion 110 comes into contact with the inclined surface 76a of the pressed projection 76 of the inner brake pad 21, and unlike the first embodiment, the disc feeding side and the inner side. The pressing piece 97 comes into contact with the corner portion on the disk insertion side of the pressed protrusion 77 of the brake pad 21 on the inner side in the fourth plate portion 144 while being bent outward in the disk radial direction. Similarly to FIG. 3 of the first embodiment, the pressed portion 98 of the brake pad 22 on the outer side in the second plate portion 122 while the pressing piece 98 on the disk insertion side and the outer side slightly bends outward in the radial direction of the disk. 87, the pressing piece 99 on the disk delivery side and the outer side is slightly bent outward in the radial direction of the disk, and the pressed projection 88 of the brake pad 22 on the outer side in the second plate portion 127. It will contact | abut to the top part 88c.

  At this time, the fourth plate portion 144 of the pressing piece 97 comes into contact with the corner portion of the pressed protrusion 77 on the disk insertion side, and is smaller than the third plate portion 110 of the pressing piece 96 with respect to the reference surface described above. The angle is inclined in the same direction, and the outer side disk feeding side pressing piece 99 is inclined in the opposite direction as in FIG. 3 of the first embodiment. Therefore, the pressing piece 97 presses the inner brake pad 21 toward the inner side in the disk radial direction and the disk delivery side.

  A resultant force of the pressing force of the pressing piece 96 and the pressing piece 97 is applied to the brake pad 21 on the inner side, and a resultant force of the pressing force of the pressing piece 98 and the pressing piece 99 is applied to the brake pad 22 on the outer side. It will be. As in the first embodiment, of the pressing pieces 96 and 97 that come into contact with the inner brake pad 21 having a large weight, the pressing piece 96 positioned on the disk insertion side is connected to the outer brake pad 22 having a small weight. The pressing force on the brake pad 21 on the inner side is applied to the pressing piece 98 so that the urging force in the disk unwinding direction is increased with respect to the pressing piece 98 positioned on the disk insertion side among the pressing pieces 98 and 99 that abut. This is different from the pressing force to the brake pad 22 on the outer side. In addition, of the pressing pieces 96 and 97 that contact the brake pad 21 on the inner side that has a large weight, the pressing piece 97 that is positioned on the disk delivery side also has a pressing piece 98 that contacts the brake pad 22 on the outer side that has a small weight. 99, the pressing force on the brake pad 21 is such that the urging force in the disk discharging direction is increased with respect to the pressing piece 99 positioned on the disk discharging side, and the pressing force of the pressing piece 99 on the brake pad 22 is Is different.

  As described above, of the pressing pieces 96 to 99 of the pad spring 23, the pressing pieces 96 and 97 that contact the brake pad 21 on the inner side having a large weight are the pressing pieces 98 and 97 that contact the brake pad 22 on the outer side having a small weight. The urging force in the disc feeding direction is larger than 99.

  According to the fourth embodiment described above, of the pressing pieces 96, 97 that contact the brake pad 21 on the inner side having a large weight, the pressing piece 97 positioned on the disk delivery side has a smaller weight on the outer side brake. The pressing angles of the brake pads 21 and 22 are different so that the urging force in the disk discharging direction is increased with respect to the pressing piece 99 positioned on the disk discharging side among the pressing pieces 98 and 99 that are in contact with the pad 22. Therefore, the pair of brake pads 21 and 22 having different weights can be appropriately pressed with a simple configuration. For this reason, generation | occurrence | production of the abnormal noise by rattling and dragging of the brake pad 21 can be suppressed.

  In the fourth embodiment, the disk-feeding-side and inner-side pressing piece 96 is the same as in the third embodiment, and the pressing force of the pad spring 23 on the disk-feeding side is increased with the pressing piece 97 as a main component. Also good. Further, the first to fourth embodiments may be appropriately combined.

11 Disc brake 12 Disc 13 Mounting bracket 16 Caliper 21 Brake pad (one brake pad)
22 Brake pad (the other brake pad)
23 Pad spring 35, 36 Fixing part 95 Locking part 96-99 Pressing piece

Claims (3)

A mounting bracket having a fixed portion fixed to a non-rotating portion of the vehicle;
A pair of brake pads provided on both sides of a disk that rotates with the vehicle wheel, one of which is heavier than the other;
A caliper provided slidably on the mounting bracket and capable of pressing the pair of brake pads against the disc;
A pad spring having a pressing piece that is locked to the caliper and urges the brake pad at least in the disk radial direction for each brake pad;
In a disc brake having
Of the pressing pieces of the pad spring, one pressing piece that comes into contact with the one brake pad having a larger weight is attached to the disc feeding direction than the other pressing piece that comes into contact with the other brake pad having a lower weight. Disc brakes characterized by increased power. The pressing piece is formed by being divided into four parts extending from the engaging part of the pad spring to the caliper on both sides in the rotational direction of the disk,
Of the one pressing piece, the pressing piece located on the disk entry side has a larger urging force in the disk feeding direction than the other pressing piece located on the disk entry side. The disc brake according to claim 1, wherein a contact angle with the brake pad is different. The pressing piece is formed by being divided into four parts extending from the engaging part of the pad spring to the caliper on both sides in the rotational direction of the disk,
Of the one pressing piece, the pressing piece located on the disk delivery side has a greater biasing force in the disk delivery direction than the other pressing piece located on the disk delivery side. The disc brake according to claim 1, wherein a contact angle with the brake pad is different.

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