JP5542602B2 - Disc brake - Google Patents

Description

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

  A disc brake for braking a vehicle is configured such that a brake pad is brought into contact with a disc rotating with a wheel by a caliper, and braking is performed by the frictional resistance thereof. In such a disc brake, there is a structure in which a pin member is provided on a mounting bracket that supports a caliper, and a brake pad is supported by the pin member (see, for example, Patent Document 1).

JP-A-6-323347

  In the brake pad, frictional heat is generated at the time of braking, but since the contact area between the pin member and the brake pad is relatively small when the brake pad is supported on the pin member as described above, It is difficult to transmit frictional heat to the mounting bracket, and frictional heat tends to stay on the brake pads.

  An object of this invention is to provide the disc brake which can make it difficult to keep the frictional heat of a brake pad.

  In order to achieve the above object, in the present invention, a heat transfer member for directly transferring heat of the brake pad to the mounting bracket is interposed between the brake pad supported by the pin member and the mounting bracket.

  According to the present invention, it is possible to make the frictional heat of the brake pad difficult to block.

It is a top view which shows the disc brake of 1st Embodiment which concerns on this invention. It is a front view which shows the disc brake of 1st Embodiment which concerns on this invention. It is a side view showing the disc brake of a 1st embodiment concerning the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1 showing the disc brake of the first embodiment according to the present invention. It is a BB cross-sectional arrow view of FIG. 1 which shows the disc brake of 1st Embodiment which concerns on this invention. It is CC sectional view taken on the line in FIG. 1 which shows the disc brake of 1st Embodiment which concerns on this invention. It is a perspective view which shows the heat transfer member of the disc brake of 1st Embodiment which concerns on this invention. 1 shows a heat transfer member of a disc brake according to a first embodiment of the present invention, where (a) is a plan view, (b) is a side view seen from one side, (c) is a front view, and (d) is a front view. It is the side view seen from the reverse side. It is a fragmentary top view which shows the principal part of the disc brake of 2nd Embodiment which concerns on this invention. It is a fragmentary top view which shows the principal part of the modification of the disc brake of 2nd Embodiment which concerns on this 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 metal mounting bracket 13 disposed and fixed to a non-rotating portion of the vehicle, a metal guide pin 14 fixed to the mounting bracket 13 along the axial direction of the disk 12, and a metal main pin (pin member) ) 15 and a pin slide type caliper 16 that is slidably supported by the guide pin 14 and the main pin 15 with respect to the mounting bracket 13. 1, 2, 4, and 5, the rotation direction of the disk at the time of forward braking of the vehicle is indicated by an arrow R, and the inlet side in this rotation direction is the disk inlet side, and the outlet side is the disk. The following explanation will be given as a delivery side.

  As shown in FIG. 4, the disc brake 11 of the first embodiment is slidably supported by a mounting bracket 13 and a metal pad pin 20 fixed to the caliper 16, and is an outer side that is one side of the disc 12. 5, the brake pad 21 slidably supported by the main pin 15 and the pad pin 20 and disposed on the inner side (wheel side), which is the other side of the disk 12, as shown in FIG. A pad spring 23 shown in FIGS. 4 and 5 that is locked to the caliper 16 and urges the pair of brake pads 21 and 22 toward the inner side in the disk radial direction and the disk delivery side. A pad guide 24 that is attached to the mounting bracket 13 shown in FIG. 4 and guides the brake pad 21 on the outer side, and a guide pin 4 a rubber boot 25 shown in FIG. 3 for covering, and a rubber boot 26 for covering the main pin 15.

  The mounting bracket 13 is formed from a metal plate material by sheet metal, and as shown in FIG. 4, a base portion 31 extending in the disc rotation direction and a disc from the end of the base portion 31 on the disc delivery side. And an extending portion 32 extending upward that is radially outward. An attachment hole 33 is formed in the base portion 31 at an intermediate position in the disk rotation direction, and an attachment hole 34 is formed at the end on the disk delivery side, that is, the extension part 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 mounting bracket 13 has a guide pin mounting hole 40 at the end of the base portion 31 on the disk insertion side, and a main pin mounting hole 41 at the end of the extending portion 32 in the disk radial direction, that is, at the upper end. It is formed to penetrate in the direction. The above-described guide pin 14 is fixed to the guide pin mounting hole 40 on the disk insertion side so as to protrude only on the side (outer side) opposite to the disk 12 along the disk axial direction. The main pin 15 described above is fixed to the main pin mounting hole 41 on the disk delivery side so as to protrude to the disk 12 side (inner side) and the side opposite to the disk 12 (outer side) along the disk axial direction. Has been. The main pin 15 is arranged on the outer side of the disk 12 in the radial direction. As shown in FIG. 1, the main pin 15 extends from the outer side (lower side in FIG. 1), which is one side of the disk 12, to the other side of the disk 12. It extends beyond the disk 12 to a certain inner side (upper side in FIG. 1).

  As shown in FIG. 4, the mounting bracket 13 protrudes from the base portion 31 toward the outer side in the disk radial direction, slightly toward the disk outlet side than the guide pin mounting hole 40 on the outer side in the disk radial direction of the base portion 31. A guide protrusion 44 is formed. Further, 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 is slidably attached to the guide pin 14 and the main pin 15 of the mounting bracket 13 in a state of straddling the disc 12, and the caliper 16 is provided so as to be slidable along the disc rotation direction. Two pistons 50 and 51 shown in FIG. 2 and the above-described pad pin 20 attached to the caliper body 48 are provided.

  The caliper body 48 is integrally formed by casting. As shown in FIG. 1, the caliper body 48 is arranged on the outer side of the mounting bracket 13, and the radial direction of the disc 12 from the outside of the disc portion 52 in the disc radial direction. The bridge portion 53 extends to the inner side so as to exceed the outer side, and the claw portion 54 extends to the inner side in the radial direction of the disk 12 so as to face the cylinder portion 52 from the inner side end portion of the bridge portion 53. doing.

  2 is a diagram in which the guide pin 14 on the disk feed-in side is slidably fitted to the cylinder portion 52 and the main pin 15 on the disk feed-out side is slidably fitted. And a sliding guide hole 58 shown in FIG. Further, the cylinder portion 52 is formed with bores 60 and 61 shown in FIG. 2 that open toward the claw portion 54 in the disk axial direction, and pistons 50 and 51 are fitted into the bores 60 and 61, respectively. The The cylinder part 52 is provided with air bleeding bleeder plugs 62 and 63 communicating with the bores 60 and 61, respectively.

  As shown in FIG. 3, the caliper 16 has a claw 54 disposed on the side opposite to the disc 12 of the inner brake pad 22 and a cylinder on the side opposite to the disc 12 of the outer brake pad 21. The part 52 is arranged. When the pistons 50 and 51 shown in FIG. 2 advance toward the claw 54 by the brake fluid pressure introduced into the cylinder 52, the pistons 50 and 51 press the brake pad 21 on the outer side against the disk 12. Become. On the other hand, the guide pin 14 and the main pin 15 are slid by the reaction force, and the claw portion 54 presses the brake pad 22 on the inner side against the disk 12. Thereby, a pair of brake pads 21 and 22 provided on both surfaces of the disk 12 are brought into contact with the disk 12, and the disk 12, that is, the wheel is braked by the frictional resistance.

  As shown in FIG. 4, the brake pad 21 on the outer side (piston side) includes a friction material 66 that contacts the disk 12 to generate a frictional resistance, and a metal plate-like back metal 67 that holds the friction material 66. And have.

  The back metal 67 includes a main plate portion 68 to which the friction material 66 is fixed, an end protruding portion 69 that protrudes from the outer side of the main plate portion 68 in the disc radial direction to the disc insertion side, and a disc on the inner side of the main plate portion 68 in the disc radial direction It has an inner protrusion 70 that protrudes inward in the disk radial direction from the intermediate position in the rotational direction, and an end protrusion 71 that protrudes from the main plate 83 to the disk delivery side. A laterally long pad pin hole 72 through which the pad pin 20 is inserted is formed in the end protruding portion 71 so as to penetrate in the disk axial direction.

  The brake pad 21 on the outer side has a pad pin hole 72 supported by the pad pin 20, and a flat surface 69 a on the inner side in the disk radial direction of the end protrusion 69 is a pad attached to the guide protrusion 45 of the mounting bracket 13. The flat surface 68a on the disk delivery side of the main plate 68 following the flat surface 69a is in surface contact with the outer side in the disk radial direction of the guide 24, and the disk guide of the pad guide 24 attached to the guide protrusion 45 of the mounting bracket 13 is inserted. Make surface contact to the side. Further, the inner projecting portion 70 can come into surface contact with the flat surface 44 a on the disk delivery side of the guide projecting portion 44 of the mounting bracket 13. The outer brake pad 21 is guided by the pad pin 20, the pad guide 24 and the guide projection 44 in the disc axial direction.

  As shown in FIG. 5, the brake pad 22 on the inner side (claw portion side) includes a friction material 75 that contacts the disk 12 to generate a frictional resistance, and a metal plate-like backing metal that holds the friction material 75. 76.

  The back metal 76 includes a main plate part 77 to which the friction material 75 is fixed, an end protrusion part 78 protruding from the main plate part 73 toward the disk entry side, and an end protrusion protruding from the main plate part 73 toward the disk supply side. Part 79.

  The disk protrusion side end protrusion 78 is formed with a horizontally long pad pin hole 80 through which the pad pin 20 is inserted so as to penetrate in the disk axis direction. A substantially rectangular main pin hole 81 through which the pin 15 is inserted is formed penetrating in the disk axial direction. Since the main pin 15 has a cylindrical shape and the main pin hole 81 has a substantially rectangular shape, the main pin 15 is in line contact with the main pin hole 81.

  The end protrusion 79 on the disk delivery side has a flat surface 79a on the disk delivery side, and a flat surface 79b on the outer side in the disk radial direction. The flat surface 79 a on the disk delivery side is along a line passing through the center of the friction material 75 along the disk radial direction and along the axial direction of the disk 12. The flat surface 79b on the outer side in the disk radial direction is along the direction perpendicular to the line passing through the center of the friction material 75 along the disk radial direction and along the axial direction of the disk 12. The inner brake pad 22 is slidably supported by the main pin 15 and the pad pin 20.

  In the first embodiment, between the mounting bracket 13 and the brake pad 22 disposed on the inner side, which is the other surface side of the disk 12, of the pair of brake pads 21 and 22 and supported by the main pin 15. Further, a heat transfer member 85 that directly transfers the heat of the brake pad 22 to the mounting bracket 13 is interposed.

  The heat transfer member 85 is made of a cylinder having high thermal conductivity or a metal such as aluminum, and is integrally formed by punching and bending a plate material by press molding.

  As shown in FIGS. 7 and 8, the heat transfer member 85 includes a disc-shaped substrate portion 87 having a through hole 86 formed in the center, and a substrate portion 87 from a position 90 ° different from the circumferential direction of the substrate portion 87. And a pair of extending plate portions 88 and 89 extending in the axial direction. The pair of extending plate portions 88 and 89 are respectively in the same plane as the substrate portion 87 and protruded radially outward from the substrate portion 87, and the opposite side of the protruding plate portion 90 from the substrate portion 87. The intermediate plate 91 extending from the end of the intermediate plate 91 along the axial direction of the substrate 87 and the end of the intermediate plate 91 opposite to the protruding plate 90 are closer to the central axis of the substrate 87 from the end to the front end. Inclined plate portion 92 extending in a slanted manner in this manner, and flat tip plate portion 93 extending along the axial direction of substrate portion 87 from the end opposite to intermediate plate portion 91 of inclined plate portion 92. And have.

  Then, such a heat transfer member 85 is attached so as to come into contact with the mounting bracket 13 in surface contact with the main pin 15 inserted through the through hole 86 as shown in FIG. Specifically, the main pin 15 is fitted in the pad guide pin portion 96 inserted into the main pin hole 81 of the brake pad 22 and the main pin mounting hole 41 of the mounting bracket 13 having a larger diameter than the pad guide pin portion 96. A fitting shaft portion 97 to be fixed and a caliper guide pin portion 98 having a smaller diameter than the fitting shaft portion 97 and fitted in the sliding guide hole 58 of the caliper body 48 are provided.

  The heat transfer member 85 is located at a position where the caliper guide pin portion 98 of the main pin 15 is inserted into the through hole 86 and abuts the fitting shaft portion 97 and the mounting bracket 13. The board portion 87 is sandwiched between the locking ring 99 that is fitted to the boot 26 and locks one end of the boot 26, the fitting shaft portion 97, and the mounting bracket 13. Thereby, the heat transfer member 85 is fixed to the main pin 15 in a state where the board portion 87 is in surface contact with the fitting shaft portion 97 and the mounting bracket 13.

  In the state of being fixed to the main pin 15 in this way, the heat transfer member 85 has the tip plate portion 93 of one extension plate portion 88 of the end projection portion 79 of the brake pad 22 as shown in FIG. The flat surface 79a is movably brought into surface contact, and the other end plate portion 89 of the extension plate portion 89 is movably brought into surface contact with the flat surface 79b of the end protrusion 79. In this state, the heat transfer member 85 contacts the outer side in the disk radial direction near the main pin 15 that receives the braking torque of the brake pad 22 and the disk delivery side, and makes contact while allowing the brake pad 22 to move. Therefore, at this time, the heat transfer member 85 contacts the brake pad 22 with a spring property that does not prevent the sliding of the brake pad 22.

  According to the first embodiment described above, the brake pad 22 is disposed between the mounting pad 13 and the brake pad 22 disposed on the opposite side of the disc 12 from the mounting bracket 13 and supported by the main pin 15. A heat transfer member 85 for directly transferring the heat to the mounting bracket 13 is interposed. For this reason, the heat transfer member 85 efficiently transfers the heat of the brake pad 22 to the mounting bracket 13 and further from the mounting bracket 13 to the vehicle body side. Therefore, the frictional heat of the brake pad 22 can be made less likely to be stored without increasing the heat capacity (mass) of the caliper 16. As a result, fade of the brake pad 22 and early wear of the brake pad 22 can be suppressed.

  That is, the brake pad 22 has the back metal 76 in contact with the main pin 15 in the main pin hole 81 having a substantially square hole shape. Therefore, the contact area of this contact portion is small, and the frictional heat at the time of braking is main in only this contact portion. Although it is difficult to transmit to the pin 15 and eventually the mounting bracket 13 and the vehicle body side, the heat of the brake pad 22 can be efficiently transmitted to the mounting bracket 13 via the heat transfer member 85 that contacts the back metal 76 and the mounting bracket 13. it can.

  Moreover, in the heat transfer member 85, the flat end plate 93 of one extension plate 88 is in surface contact with the flat surface 79a of the end protrusion 78, and the flat end of the other extension plate 89 is provided. Since the plate portion 93 comes into surface contact with the flat surface 79b of the end protrusion 78, the heat from the back metal 76 can be efficiently transmitted to the heat transfer member 85. Therefore, the frictional heat of the brake pad 22 can be reliably prevented from being trapped.

  On the other hand, the brake pad 21 arranged on the same side as the mounting bracket 13 is such that the flat surface 69a of the end protrusion 69 and the flat surface 68a of the main plate 68 following the flat surface 69a are the guide protrusions 45 of the mounting bracket 13. Therefore, the heat of the brake pad 21 can be efficiently transferred from the back metal 71 to the mounting bracket 13 via the pad guide 24. Therefore, the temperature difference between both brake pads 21 and 22 can be reduced.

  In addition, since the effect can be obtained simply by adding the heat transfer member 85 to the existing product, the above-described effect can be obtained at low cost.

  In addition, by using grease such as silicon grease at the contact portion between the brake pad 22 and the heat transfer member 85, it is possible to improve heat transfer performance and improve sliding performance of the brake pad 22.

“Second Embodiment”
Next, a second embodiment according to the present invention will be described mainly based on FIG. 9 with a focus on differences from the first embodiment. 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, the contact plate 101 in surface contact with the side opposite to the disk 12 of the back metal 76 of the brake pad 22, the contact plate 102 in surface contact with the side opposite to the disk 12 of the mounting bracket 13, and these contacts A heat transfer member 104 is provided that includes a hinged connecting portion 103 that connects the plates 101 and 102 so as to be close to and away from each other. The connecting part 103 rotatably connects the two connecting plates 105 and 106, a rotating shaft 107 that rotatably connects the contact plate 101 and the connecting plate 105, and the contact plate 102 and the connecting plate 106. The rotating shaft 108 and the rotating shaft 109 that connectably connect the connecting plates 105 and 106 to each other. The heat transfer member 108 is also made of a cylinder having high thermal conductivity or a metal such as aluminum.

  According to the second embodiment, the surface of the brake pad 22 supported by the main pin 15 is brought into surface contact with the mounting bracket 13, and the heat of the brake pad 22 is directly transmitted to the mounting bracket 13. A heat transfer member 104 is interposed between the brake pad 22 and the mounting bracket 13. For this reason, the heat transfer member 104 efficiently transfers the heat of the brake pad 22 to the mounting bracket 13 and further from the mounting bracket 13 to the vehicle body side. Therefore, the frictional heat of the brake pad 22 can be made less likely to be stored without increasing the heat capacity (mass) of the caliper 16.

  In the second embodiment, the contact plates 101 and 102 of the heat transfer member 104 are connected by a flexible heat pipe 111 having a high thermal conductivity as shown in FIG. Alternatively, they may be connected with a bundle of flexible thin wires (such as twisted wires) having high thermal conductivity.

11 Disc brake 12 Disc 13 Mounting bracket 15 Main pin (pin member)
16 Caliper 21 Brake pad (one brake pad)
22 Brake pads (other side brake pads)
35, 36 fixing part 85, 104 heat transfer member

Claims (1)

A mounting bracket having a fixed portion fixed to a non-rotating portion of the vehicle on one side of the disk;
A pin member provided on the mounting bracket and extending in the axial direction of the disc to the other surface side of the disc;
A pair of brake pads provided on both sides of a disc rotating with the wheels of the vehicle;
A caliper provided on the mounting bracket so as to be slidable and capable of pressing the pair of brake pads against the disc;
Between the mounting bracket and the other side brake pad disposed on the other side of the disc and supported by the pin member of the pair of brake pads, the heat of the other side brake pad is A disc brake characterized in that a heat transfer member for directly transmitting to the mounting bracket is interposed.

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