JP2008298198A - Disc brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent dragging of a friction pad, the squeak of a brake or the like, by increasing flexural rigidity of a pad spring. <P>SOLUTION: A cutout part 16 forming an inverse U shape is arranged between the base end side of an energizing part 15 in the radial direction, and a guide plate part 13 in the pad spring 9 elastically supporting the friction pad 7 between respective arm parts 2A of an installation member 2. A reinforcing part 19 composed of a recess-projection-shaped part slenderly extending in the axial direction of a disc 1, is formed in a part overhanging outside in the axial direction of the disc 1 more than a dimensional range L of a pad guide 4 among a guide bottom plate 13C of the guide plate part 13 by applying embossing finish, for example, to a position near the cutout part 16. This reinforcing part 19 is provided for enhancing the flexural rigidity by restraining the guide bottom plate 13C of the guide plate part 13 from being deflectively deformed in the rotational direction of the disc 1 in the position near the cutout part 16. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a disc brake suitably used for applying a braking force to a vehicle such as an automobile.

  In general, a disc brake provided in a vehicle such as an automobile has a pair of arms spaced apart in the rotational direction of the disc and straddling the outer peripheral side of the disc in the axial direction, and an attachment member attached to a non-rotating portion of the vehicle, A caliper that is slidably provided on each arm portion of the mounting member and presses a pair of friction pads against both sides of the disk, and a pair of friction pads that are respectively attached to the arm portions of the mounting member between the arm portions. It is comprised by the pad spring etc. which support elastically (for example, refer patent document 1).

JP 2006-308011 A

  This type of disc brake according to the prior art is such that when a vehicle driver or the like performs a brake operation, a piston provided on the inner side of the caliper is slid to the disc side by supplying hydraulic pressure from the outside, and the inner side Press the friction pad against the disc. Then, the caliper slides and displaces with respect to the mounting member by the reaction force at this time, and presses each friction pad on both surfaces of the disk between its outer claw part and the piston, thereby applying a braking force to the rotating disk. Is given.

  In this case, each arm portion of the mounting member is provided with a pad guide for guiding the pair of friction pads so as to be slidable in the axial direction of the disk. The pad spring prevents the friction pad from rattling with respect to the pad guides and the like of the respective arm portions, and smoothes the sliding displacement of the friction pad.

  That is, this pad spring is formed by pressing a metal plate having spring properties. The pad spring is fitted and attached to the pad guide of the mounting member and guides the friction pad in the axial direction together with the pad guide, and a disk between the guide plate and the friction pad. And a radial urging portion that elastically urges the friction pad toward the outer side of the disk in the radial direction.

  Further, a notch portion having, for example, an inverted U shape is formed between the guide plate portion and the radial biasing portion of the pad spring, and the influence (for example, the elastic biasing portion of the radial biasing portion) The stress, strain, etc. associated with elastic deformation) are prevented from reaching the guide plate portion side by blocking the notch portion.

  By the way, in the above-described prior art, the radial biasing portion of the pad spring is folded back in an arc shape from the guide plate portion toward the radially outer side of the disc from the guide plate portion, and the disc is interposed between the guide plate portion and the friction pad. In this configuration, the friction pad is elastically biased toward the outer side in the radial direction of the disk.

  Further, by forming a notch portion having an inverted U shape between the proximal end side of the radial urging portion and the guide plate portion, stress accompanying elastic deformation of the radial urging portion is formed. (Strain) is prevented from being transmitted to the guide plate portion, and the guide plate portion can smoothly guide (guide) the friction pad in the axial direction of the disk.

  However, since the guide plate portion of the pad spring is cut in the middle portion by the notch portion, the bending rigidity in the rotation direction of the disk, for example, is reduced at the peripheral position near the notch portion, as described below. In addition, there is a problem that the brake squeals and drag torque is increased.

  That is, when the brake operation is released and the friction pad is about to slide and displace toward the outer side (standby position) in the axial direction of the disk, the guide plate portion of the pad spring is positioned at the position around the notch. May be bent so as to be bent in the rotation direction. As a result, the operation of returning the friction pad to the standby position becomes unstable, and the friction pad may remain in contact with the surface of the disk, which may cause pad dragging and brake noise. There's a problem.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to easily increase the bending rigidity of the pad spring and smoothly move the friction pad to the standby position when the brake operation is released. It is an object of the present invention to provide a disc brake that can be returned and can prevent pad dragging, brake squealing, and the like.

  In order to solve the above-described problems, the present invention provides a mounting member having a pair of arm portions that are spaced apart in the rotational direction of the disc and straddle the outer peripheral side of the disc in the axial direction, and a pad guide is provided on each arm portion. A caliper slidably provided on each arm portion of the mounting member, and slidably attached to each arm portion of the mounting member via the pad guide, and pressed against both sides of the disk by the caliper. The present invention is applied to a disc brake including a pair of friction pads and a pad spring that is attached to each arm portion side of the attachment member and elastically supports the friction pads between the arm portions.

  According to the first aspect of the present invention, the pad spring is fitted and attached to the pad guide of the mounting member to guide the friction pad in the axial direction, and the pad spring is more than the pad guide. A guide plate portion extending outwardly in the axial direction of the disk and a base end side are integrally formed with the guide plate portion, and the distal end side is elastically deformed so that the gap between the guide plate portion and the friction pad is in the axial direction of the disc. By extending, the radial urging portion that elastically urges the friction pad toward the radially outer side of the disk, and the influence due to the elastic deformation of the radial urging portion is prevented from reaching the guide plate portion. Therefore, a notch portion provided between the proximal end side of the radial urging portion and the guide plate portion, and the guide plate portion provided at a position close to the notch portion, the guide plate portion being a disc To prevent bending and deformation in the direction of rotation It lies in the arrangement and a section.

  According to a second aspect of the present invention, the reinforcing portion is formed by a concavo-convex shape portion formed by partially denting the guide plate portion and extending in the axial direction of the disk.

  According to a third aspect of the present invention, the reinforcing portion is formed at a portion of the guide plate portion that protrudes outward in the axial direction of the disk from the pad guide.

  As described above, according to the first aspect of the present invention, the pad spring that elastically supports each friction pad between the arm portions of the mounting member includes the guide plate portion, the radial urging portion, the notch portion, and the reinforcement. The reinforcing portion is configured to suppress the guide plate portion from being bent and deformed in the rotational direction of the disk at a position close to the notch portion, and therefore at a peripheral position near the notch portion. The bending rigidity of the guide plate portion can be increased. As a result, when the brake operation is released and the friction pad is about to slide and displace toward the outer side (standby position) in the axial direction of the disk, the guide plate is rotated around the notch in the disk rotation direction. It is possible to prevent bending so as to be bent.

  Accordingly, the friction pad can be smoothly returned to the standby position by the radial biasing portion of the pad spring when the brake operation is released, the return operation of the friction pad can be stabilized, and the bending rigidity of the pad spring can be easily achieved. Thus, pad dragging, brake noise, etc. can be prevented. Further, by increasing the bending rigidity of the pad spring, it is possible to suppress deformation when the pad spring is assembled to the mounting member, and to improve the work at the time of assembly.

  According to the second aspect of the present invention, the reinforcing portion of the pad spring is formed by a concave and convex portion formed by partially denting the guide plate portion and extending in the axial direction of the disk. The reinforcing part can be easily formed by embossing, for example, in the vicinity of the notch in the guide plate part of the spring, and the thickness and outer dimensions of the guide plate part (width dimension in the radial direction of the disk) The bending rigidity of the guide plate portion can be reliably increased without increasing the size.

  Further, according to the invention of claim 3, since the reinforcing portion is formed in the portion of the guide plate portion that protrudes outward in the axial direction of the disk from the pad guide, the guide plate portion of the pad spring is attached to the mounting member. When fitting and attaching to the pad guide, for example, the reinforcing part formed by embossing or the like can be prevented from coming into contact with and interfering with the pad guide, and the guide plate part can be stably placed in the pad guide. Can be assembled. In addition, the bending rigidity of the portion of the guide plate portion that protrudes outward in the axial direction of the disc from the pad guide can be effectively increased by the reinforcing portion, and this protruding portion is bent and deformed in the rotation direction of the disc. Thus, the return operation of the friction pad can be prevented from becoming unstable.

  Hereinafter, a disc brake according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  Here, FIG. 1 to FIG. 10 show a first embodiment of the present invention. In the figure, reference numeral 1 denotes a rotating disk. The disk 1 rotates in the direction of arrow A in FIG. 1 together with wheels (not shown) when the vehicle travels in the forward direction, for example.

  Reference numeral 2 denotes an attachment member as a carrier attached to a non-rotating portion of the vehicle. As shown in FIGS. 1 and 2, the attachment member 2 is spaced apart in the rotation direction (circumferential direction) of the disc 1 and the outer periphery of the disc 1. A pair of arm portions 2A, 2A extending in the axial direction of the disk 1 and a base end side of each arm portion 2A are connected so as to be integrated so as to straddle the disk 1 and become the inner side of the disk 1 And a thick support portion 2B fixed to a non-rotating portion of the vehicle at a position.

  Further, a reinforcing beam 2C that connects the distal ends of the arms 2A and 2A to each other at a position on the outer side of the disk 1 is integrally formed on the mounting member 2 in a bow shape as shown in FIG. Thereby, each arm part 2A, 2A of the attachment member 2 is integrally connected by the support part 2B on the inner side of the disk 1, and is integrally connected by the reinforcing beam 2C on the outer side.

  A disc path portion 3 extending in an arc shape along the outer periphery (rotation locus) of the disc 1 is formed in the middle portion of the arm portion 2A in the length direction (axial direction of the disc 1) as shown in FIG. On both sides of the disk path portion 3 (both sides in the axial direction of the disk 1), pad guides 4 on the inner side and the outer side are formed in a dimension range L to be described later. Each arm 2A is provided with pin holes 2D, for example, as indicated by dotted lines in FIG. 3, and sliding pins 6 described later are slidably inserted into these pin holes 2D. Is.

  4, 4,... Are pad guides provided on the respective arm portions 2 </ b> A of the mounting member 2, and these pad guides 4 are formed as concave grooves having a U-shaped cross section as shown in FIGS. 1 and 3. A friction pad 7 to be described later extends in the sliding direction (the axial direction of the disk 1). These pad guides 4 are positioned on both sides in the axial direction of the disc path portion 3 as shown in FIG. 2, and are respectively arranged on the proximal end side (inner side) and the distal end side (outer side) of each arm portion 2A. It is installed.

  That is, the inner side and outer side pad guides 4 and 4 are arranged within the dimension range L illustrated in FIG. 2 among the arm portions 2A of the mounting member 2 extending in the axial direction of the disk 1, It is formed on both the left and right sides (both sides in the axial direction of the disc 1) with the disc path portion 3 located in the middle (center side of the dimension range L) in between. 1 and 3, the outer side pad guide 4 is shown.

  Here, as shown in FIG. 3, the pad guide 4 includes an outer diameter wall surface (hereinafter referred to as an upper wall surface 4 </ b> A) positioned on the radially outer side of the disk 1 and an inner diameter wall surface (hereinafter referred to as the upper wall surface 4 </ b> A). And the lower side wall surface 4B) and the back side wall surface 4C that connects these wall surfaces 4A and 4B on the back side. The pad guide 4 has a U-shaped cross section with these wall surfaces 4A, 4B, and 4C, and the upper wall surface 4A and the lower wall surface 4B are spaced apart from each other in the upper and lower directions in FIG. Has been.

  That is, the pad guide 4 is formed so as to sandwich ear portions 8A and 8B of a friction pad 7 described later between the upper wall surface 4A and the lower wall surface 4B from the upper and lower directions (the radial direction of the disk 1). The friction pad 7 is guided in the axial direction of the disk 1 between the wall surfaces 4A and 4B. Further, the back side wall surface 4C of the pad guide 4 functions as a so-called torque receiving portion, and receives the braking torque received by the friction pad 7 from the disk 1 during the brake operation via a delivery-side ear portion 8B described later. It is.

  A caliper 5 is slidably provided on the mounting member 2, and the caliper 5 includes an inner leg 5A provided on one side (inner side) of the disk 1 and each of the mounting members 2 as shown in FIG. A bridge portion 5B extending from the inner leg portion 5A to the other side (outer side) of the disc 1 so as to straddle the outer peripheral side of the disc 1 between the arm portions 2A, and a distal end side (outer side) of the bridge portion 5B The outer leg 5C extends inward in the radial direction of the disk 1 and has a bifurcated outer leg.

  The inner leg 5A of the caliper 5 is formed with a cylinder (not shown) into which the piston is slidably fitted. Further, the inner leg portion 5A is provided with a pair of mounting portions 5D and 5D protruding leftward and rightward in FIG. 1, and each mounting portion 5D has the caliper 5 as a whole through a sliding pin 6 described later. The arm 2A of the mounting member 2 is slidably supported.

  6 is a slide pin (only one is shown in FIG. 3) as a support member for slidably supporting the caliper 5 on the mounting member 2, and these slide pins 6 are respectively attached to the mounting portions 5D of the caliper 5. It is fastened using a bolt or the like, and the tip side thereof extends into each arm portion 2B (pin hole 2D) of the mounting member 2. The tip side of each sliding pin 6 is slidably inserted into each pin hole 2D of the mounting member 2 as shown by a dotted line in FIG. 3, and the caliper 5 It is slidably supported by each arm part 2A of the attachment member 2 via.

  Reference numerals 7 and 7 denote inner and outer friction pads disposed opposite to both surfaces of the disk 1, and these friction pads 7 are formed in a flat plate shape extending in the rotation direction of the disk 1 as shown in FIGS. And a lining (not shown) as a friction material that is fixedly attached to the surface side of the back metal 8 and makes frictional contact with the surface of the disk 1. The back metal 8 of the friction pad 7 is provided with protruding ears 8A and 8B as convex portions on both ends in the length direction (circumferential direction of the disk 1).

  In this case, the ears 8A and 8B of the friction pad 7 (back metal 8) are formed in the same shape as each other, for example, as shown in FIG. However, one ear 8A is arranged on the rotation direction inlet side (hereinafter referred to as the turn-in side) of the disk 1 rotating in the direction indicated by arrow A, and the other ear 8B is arranged on the rotation direction outlet side of the disk 1 ( Hereinafter, it is arranged on the delivery side).

  Here, the ears 8A and 8B of the back metal 8 are slidably inserted into the pad guides 4 of the mounting member 2 via the guide plate parts 13 and 24 of the pad springs 9 and 20, which will be described later. Yes. The inner and outer friction pads 7 are pressed against both sides of the disk 1 by the caliper 5 during brake operation. At this time, the ears 8A and 8B of the back metal 8 are along the pad guide 4 in the axial direction of the disk 1. It slides and displaces.

  Further, the back metal 8 of the friction pad 7 is formed with flat surface portions 8C and 8D on both sides in the length direction (the inflow side and the outflow side of the disc 1), and these flat surface portions 8C and 8D are shown in FIG. As shown, it extends inward in the radial direction of the disk 1 in a direction substantially perpendicular to the protruding direction of the ears 8A, 8B.

  A rotational direction biasing portion 18 of a pad spring 9 to be described later elastically abuts on a flat surface portion 8C located on the side of the disk 1 in the flat surface portions 8C and 8D of the friction pad 7 (back metal 8). As a result, the friction pad 7 is constantly urged in the rotational direction of the disk 1 (for example, the direction indicated by the arrow A1 in FIG. 3).

  On the other hand, the ear portion 8B positioned on the delivery side of the disk 1 is elastically pressed against the back side wall surface 4C of the pad guide 4 via a guide bottom plate 24C of the pad spring 20 described later by the biasing force at this time. When the brake is operated, the ear 8B on the output side is brought into contact with the back side wall surface 4C via the guide bottom plate 24C by the braking torque (rotational torque in the direction of arrow A in FIG. 1) received by the friction pad 7 from the disk 1. The braking torque at the time of the brake operation is received between the contact surfaces of the two.

  9 is a pad spring on the turn-in side disposed on the turn-in side of the disk 1, and the pad spring 9 is attached to the arm part 2A located on the turn-in side among the arm parts 2A of the mounting member 2, and will be described later. The friction pad 7 on the inner side and the outer side is elastically supported between the pad spring 20 on the delivery side and the sliding displacement of these friction pads 7 is made smooth.

  The pad spring 9 is integrally formed by bending a stainless steel plate having a spring property as shown in FIGS. 3 to 9 using means such as press working, and a connecting plate portion 10 and a guide plate portion described later. 13, 13, radial direction urging portions 15, 15, rotation direction urging portions 18, 18, and the like.

  Reference numeral 10 denotes a connecting plate portion for connecting the guide plate portions 13 and the like of the pad spring 9, and the connecting plate portion 10 is formed to extend in the axial direction so as to straddle the outer peripheral side of the disk 1, and both end sides in the length direction thereof. A pair of flat plate portions 11 and 11 are integrally formed extending inward in the radial direction of the disk 1. The connecting plate portion 10 is bent in a substantially “<” shape so as to warp outward with respect to the flat plate portion 11, and is disposed along the inner side surface of the arm portion 2 </ b> A of the mounting member 2. .

  Further, an embossed portion 10A is provided at the intermediate portion in the longitudinal direction of the connecting plate portion 10 in order to increase the bending rigidity of the connecting plate portion 10 in the rotation direction of the disk 1, for example. And this embossing part 10A suppresses that the connection board part 10 bends and deform | transforms in the rotation direction etc. of the disk 1 between a pair of flat plate parts 11 and 11, and increases the bending strength (rigidity etc.) of the pad spring 9 whole. It is something to be made.

  Reference numeral 12 denotes an engaging plate portion that is located between the pair of flat plate portions 11 and 11 and is integrally formed with the connecting plate portion 10, and the engaging plate portion 12 is connected to the connecting plate portion 10 as shown in FIGS. 4 to 9. And is formed to be inclined and extend downward (inward in the radial direction of the disk 1) from the connecting plate portion 10. Then, as shown in FIG. 2, the engagement plate portion 12 is attached so as to engage with the disk path portion 3 of the arm portion 2 </ b> A from the inside in the radial direction, whereby the pad spring 9 is attached to the arm portion 2 </ b> A of the attachment member 2. Thus, the disk 1 is positioned in the axial direction.

  13 and 13 are guide plate portions provided on both end sides of the connecting plate portion 10 via the respective flat plate portions 11, and the respective guide plate portions 13 are arranged from the front end side (the lower end side shown in FIG. 3) of the flat plate portion 11. It is formed by being bent in a substantially U shape, and guides the ear portion 8A of the friction pad 7 (back metal 8) in the axial direction of the disk 1. One guide plate portion 13 of these guide plate portions 13 and 13 is fitted and attached in the outer side pad guide 4 as shown in FIGS. 2 and 3, and the other guide plate portion 13 is fitted. Are fitted and attached to the pad guide 4 on the inner side.

  Here, as shown in FIG. 3, the guide plate portion 13 of the pad spring 9 includes an upper surface plate 13A and a lower surface plate 13B facing the upper wall surface 4A and the lower wall surface 4B of the pad guide 4, and these upper surface plate 13A and lower surface plate. 13B is constituted by a guide bottom plate 13C that is connected in the radial direction of the disk 1 and extends in the axial direction of the disk 1 in a flat surface shape and abuts against the back side wall surface 4C of the pad guide 4.

  In this case, each guide bottom plate 13C of the guide plate portion 13 is formed in a flat plate shape wider than the upper surface plate 13A and the lower surface plate 13B (wide in the axial direction of the disk 1), and the pad guides 4 and 4 shown in FIG. The disk 1 extends beyond the dimension range L in the axial direction. In each of the guide bottom plates 13C, a tongue plate portion 15A of a radial urging portion 15 to be described later is formed at a portion protruding outward from the dimension range L, and a reinforcing portion 19 to be described later is formed. Is.

  Further, bent portions 13D and 13D are formed on the protruding portions of the guide bottom plates 13C and 13C on the leading end side (positions on both ends in the axial direction of the disk 1). It is bent obliquely outward in the circumferential direction (rotation direction) of the disk 1 with respect to the plane of the guide bottom plate 13C. Further, guide piece portions 13E and 13E are integrally formed on the upper surface plates 13A and 13A of the guide plate portion 13 so as to protrude in the width direction (the axial direction of the disk 1). These guide piece portions 13E function as guides when the ear portions 8A of the friction pad 7 are assembled to the pad spring 9.

  14 and 14 are claw portions provided between the lower surface plate 13B and the guide bottom plate 13C of each guide plate portion 13. The claw portions 14 are formed on the guide bottom plate 13C as shown in FIG. 4 and FIGS. It is formed as a claw piece in a substantially U shape that protrudes from the lower end side into a later-described gap 17. As shown in FIG. 3, the claw portion 14 is fitted in the pad guide 4 together with the guide plate portion 13, and the tip end side thereof elastically contacts the lower wall surface 4 </ b> B of the pad guide 4.

  Thereby, the tip of the claw portion 14 is hooked on the lower wall surface 4B of the pad guide 4 in an elastically deformed state, and the upper surface plate 13A of the guide plate portion 13 is moved above the pad guide 4 by the reaction force at this time. It is elastically pressed toward the wall surface 4A to bring the upper surface plate 13A into contact (surface contact) with the upper wall surface 4A, and the lower surface plate 13B of the guide plate portion 13 is separated from the lower wall surface 4B of the pad guide 4 with a small gap. The guide plate portion 13 is held in the pad guide 4 in a retaining state.

  Reference numerals 15 and 15 denote radial urging portions for urging the friction pads 7 and 7 toward the radially outer side of the disk 1, and each of the radial urging portions 15 is wider than the lower surface plate 13 </ b> B of the guide plate portion 13. A tongue plate portion 15A protruding from the guide bottom plate 13C substantially parallel to the lower surface plate 13B at a position on the outer side in the direction (axial direction of the disc 1), and a folded portion 15B integrally formed on the tongue plate portion 15A on the base end side The urging piece 15C and the like are configured.

  Here, the folded-back portion 15B and the urging piece 15C of the radial urging portion 15 are arranged on the axis of the disc 1 from the end in the width direction of the tongue plate portion 15A (the end opposite to the notch 16 described later). The folded portion 15B is formed in an arcuate shape by being folded back into a substantially U shape or a substantially C shape with its proximal end facing outward in the radial direction of the disk 1. It is formed as a bent part.

  Further, the urging piece 15C is formed as an elongated plate-like spring piece extending obliquely from the distal end side of the folded portion 15B to the radially outer side of the disk 1, and the distal end side is a free end. The guide plate portion 13 extends to a position above the lower surface plate 13B. The urging piece 15C of the radial urging portion 15 is provided on the lower surface plate 13B of the guide plate portion 13 when the ear portion 8A of the friction pad 7 is assembled into the guide plate portion 13 as shown in FIGS. Are elastically bent and deformed so as to be pressed in the direction (see FIGS. 7 and 9).

  Thereby, the urging piece 15C of the radial urging portion 15 is disposed so as to extend in the axial direction of the disk 1 between the lower surface plate 13B of the guide plate portion 13 and the ear portion 8A of the friction pad 7. The ears 8A of the friction pad 7 are urged in the direction indicated by the arrow B in FIG.

  Then, the ear portion 8A of the friction pad 7 is elastically pressed toward the upper surface plate 13A (the upper wall surface 4A of the pad guide 4) of the guide plate portion 13 by the urging force (elastic reaction force) of the radial urging portion 15. It is done. Thereby, the ear | edge part 8A of the friction pad 7 can suppress that the pad guide 4 (guide board part 13) rattles in the arrow B direction etc. in FIG.

  Further, the urging piece 15C of the radial urging portion 15 is obliquely upward (from the outer side in the radial direction of the disk 1) in a free state where no external force is applied as shown in FIGS. Slanted and slanted). For this reason, when the braking operation of the vehicle is released, these urging pieces 15C also exert a force (elastic force) in a direction to return each friction pad 7 to the standby position (the axially outer side of the disk 1). It is.

  Further, the urging piece portion 15C of the radial urging portion 15 is formed with a protruding piece portion 15D which is located in the middle of the length direction and is bent in a substantially “<” shape. It is formed as a protruding piece bent inward in the radial direction of the disk 1. And this protrusion 15D is arrange | positioned in the position corresponding to the space | gap part 17 mentioned later (opposite) as shown in FIG.4, FIG.7, FIG.8.

  As a result, when the urging piece 15C of the radial urging portion 15 is displaced in the direction of the lower surface plate 13B of the guide plate portion 13, that is, radially inward of the disk 1, as will be described later, as shown in FIG. The piece 15D elastically contacts the lower wall surface 4B of the pad guide 4, and the urging piece 15C of the radial urging portion 15 does not contact the lower surface plate 13B, so that excessive stress is applied to the lower surface plate 13B and the like. It prevents it from acting.

  Reference numerals 16 and 16 denote notch portions provided between the lower surface plate 13B of the guide plate portion 13 and the tongue plate portion 15A of the radial biasing portion 15, and these notch portions 16 are arranged on substantially the same plane. The lower surface plate 13B and the tongue plate portion 15A are formed as slits having an inverted U shape so as to be separated from each other in the width direction (the axial direction of the disk 1).

  In this case, each notch portion 16 has a portion of the guide bottom plate 13C of the guide plate portion 13 that protrudes outward in the axial direction of the disk 1 from the dimension range L of the pad guide 4 (see FIG. 2) from the radially inner side. It is formed so as to be partially cut away. Further, the notch 16 is disposed at a position on the inner side in the radial direction of the disk 1 with respect to a later-described reinforcing portion 19.

  For example, the notch 16 has an influence (stress, distortion) on the lower surface plate 13B of the guide plate 13 and the rotation direction urging portion 18 described later, for example, due to the elastic deformation of the radial urging portion 15. And the radial biasing portion 15 and the rotational biasing portion 18 have a function of elastically deforming independently of each other.

  17 and 17 are gaps formed in the lower surface plate 13B and the like of the guide plate 13, and these gaps 17 are formed as openings (cutout holes) having a substantially rectangular shape as shown in FIGS. One side thereof (the guide bottom plate 13C side of the guide plate portion 13) is formed in a narrow slit shape at positions on both sides of the claw portion 14. Further, the other side of the gap portion 17 extends in a wide U-shape to a midway position of a rotation direction biasing portion 18 described later.

  The gap 17 is disposed at a position corresponding to (opposed to) the projecting piece 15D of the radial biasing portion 15 as shown in FIGS. 7 and 8, and the biasing piece 15C of the radial biasing portion 15. Is displaced toward the lower surface plate 13B of the guide plate portion 13, that is, radially inward of the disk 1, the protruding piece portion 15D comes into contact with the lower side wall surface 4B of the pad guide 4 as shown in FIG. It is forgiving.

  Reference numerals 18 and 18 denote rotation direction urging portions for urging the friction pads 7 and 7 in the rotation direction of the disk 1, and each of the rotation direction urging portions 18 is a guide plate as shown in FIGS. It is formed as a plate-like body wider than the lower surface plate 13B of the portion 13, and is bent obliquely from the front end of the lower surface plate 13B to the radially inner side of the disk 1.

  The rotational direction urging portion 18 is formed as a wide plate-like spring piece bent in a “<” shape over the entire length in the width direction, and the bent portion is formed on the flat surface portion 8C of the friction pad 7 as shown in FIG. Elastically abuts. As a result, the rotation direction urging portion 18 urges the flat surface portion 8C of the friction pad 7 in the arrow A1 direction (see FIG. 3) substantially corresponding to the rotation direction of the disk 1 (arrow A direction in FIG. 1). To do. The biasing force at this time is also applied by the lower surface plate 13B of the guide plate portion 13 together with the rotation direction biasing portion 18.

  Reference numerals 19 and 19 denote reinforcement portions provided on the guide bottom plate 13C of each guide plate portion 13, and these reinforcement portions 19 project outside the dimension range L (see FIG. 2) of the pad guide 4 of the guide bottom plate 13C. For example, it is formed by embossing or the like. That is, as shown in FIGS. 6 and 7, the reinforcing portion 19 has a substantially I-shape extending in the axial direction of the disk 1 by partially denting the guide bottom plate 13C of the guide plate portion 13 by embossing or the like. It is formed as an uneven shape part. The reinforcing portion 19 has a concave shape as viewed from the contact surface of the back plate 8 of the guide bottom plate 13C. Thereby, when inserting the ear | edge part 8A of the friction pad 7 (back metal 8) in the guide board part 13 of the pad spring 9, the reinforcement part 19 does not contact | abut the ear | edge part 8A, but the friction pad 7 with respect to the pad spring 9 is not. The assembly workability is not hindered.

  Further, as shown in FIG. 2, the reinforcing portion 19 is disposed near the notch 16 in the guide bottom plate 13C of the guide plate 13 and straddles the notch 16 in the axial direction of the disk 1, and the guide bottom plate The bending rigidity of 13C is suppressed from being lowered by the notch portion 16. The reinforcing portion 19 increases the bending rigidity of the guide plate portion 13 (guide bottom plate 13C) at a peripheral position in the vicinity of the notch portion 16, thereby releasing the brake operation and moving the friction pad 7 toward the standby position. When the sliding displacement is about to be performed, the protruding portion of the guide bottom plate 13C (the portion protruding outward in the axial direction from the dimension range L shown in FIG. 2) is prevented from bending so as to be bent in the circumferential direction of the disk 1. Is.

  Reference numeral 20 denotes a drawing-side pad spring arranged on the drawing-out side of the disk 1, and the pad spring 20 is attached to the arm portion 2A located on the drawing-out side of each arm portion 2A of the attachment member 2, and is described above. The friction pad 7 on the inner side and the outer side is elastically supported between the pad spring 9 on the turn-in side and the sliding displacement of the friction pad 7 is made smooth.

  The delivery-side pad spring 20 is configured in substantially the same manner as the above-described delivery-side pad spring 9, and as shown in FIG. 10, the connecting plate portion 21, the flat plate portions 22, 22, the engaging plate portion 23, the guide The plate portions 24 and 24, the claw portions 25 and 25, the radial urging portions 26 and 26, the notches 27 and 27, and the gap portions 28 and 28 are formed.

  However, the pad spring 20 on the delivery side does not have the rotation direction urging portions 18 and 18 unlike the pad spring 9 on the entry side, but instead, bent plate portions 29 and 29 are formed. ing. That is, the bent plate portion 29 is formed integrally with a lower surface plate 24B of a guide plate portion 24 described later, and is bent substantially perpendicularly from the tip of the lower surface plate 13B to the radially inner side of the disk 1. In this respect, the rotational direction biasing portion 18 is different.

  Further, in the pad spring 20 on the delivery side, the connecting plate portion 21 has an embossed portion 21A, and each guide plate portion 24 includes an upper surface plate 24A, a lower surface plate 24B, a guide bottom plate 24C, a bent piece portion 24D, and a guide. It is composed of a piece 24E and the like. And the radial direction urging | biasing part 26 is comprised by 26 A of tongue plate parts, the folding | returning part 26B, the urging | biasing piece part 26C, and the protrusion piece part 26D.

  As shown in FIG. 1, the pad spring 20 on the delivery side is arranged in a state in which the bent plate portion 29 is always separated from the flat surface portion 8 </ b> D of the friction pad 7. It is allowed to be urged in the direction of arrow A1 (see FIG. 3) by the rotation direction urging portion 18.

  Reference numerals 30 and 30 denote reinforcing portions provided on the guide bottom plate 24C of each guide plate portion 24. These reinforcing portions 30 are configured in the same manner as the reinforcing portion 19 provided on the pad spring 9 on the turn-in side, and the guide bottom plate The bending rigidity of 24C is prevented from being lowered by the notch 27.

  The reinforcing portion 30 increases the bending rigidity of the guide plate portion 24 (guide bottom plate 24C) at a peripheral position in the vicinity of the notch portion 27, thereby releasing the brake operation and moving the friction pad 7 toward the standby position. This prevents the projecting portion of the guide bottom plate 24C (the outer portion of the dimension range L shown in FIG. 2) from bending so as to be bent in the circumferential direction of the disk 1 when trying to slide.

  The disc brake according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  First, at the time of brake operation of the vehicle, the brake fluid pressure is supplied to the inner leg portion 5A (cylinder) of the caliper 5 to cause the piston to slide and displace toward the disk 1, thereby causing the inner friction pad 7 to move toward the disk 1. Press on one side. At this time, since the caliper 5 receives a pressing reaction force from the disk 1, the entire caliper 5 is slid to the inner side with respect to the arm portion 2A of the mounting member 2, and the outer leg portion 5C is a friction pad on the outer side. 7 is pressed against the other side of the disk 1.

  As a result, the inner and outer friction pads 7 can firmly hold the disc 1 rotating in the direction of arrow A in FIG. 1 from both sides in the axial direction. A braking force can be applied. When the brake operation is released, the hydraulic pressure supply to the piston is stopped, so that the inner and outer friction pads 7 are separated from the disk 1 and return to the non-braking state again.

  Further, at the time of such a brake operation or release (during non-braking), the flat surface portion 8C located on the side where the disk 1 is fed out of the flat surface portions 8C and 8D of the friction pad 7 is rotated in the rotational direction of the pad spring 9. The urging portion 18 is urged in the direction of arrow A1 in FIG. 3, and the friction pad 7 is constantly urged in the rotation direction of the disk 1 (direction of arrow A in FIG. 1). And the ear | edge part 8B located in the delivery side of the disk 1 is elastically applied to the back side wall surface 4C of the pad guide 4 via the guide plate part 24 (guide bottom plate 24C) of the pad spring 20 by the biasing force at this time. Pressed.

  For this reason, it is possible to restrict the friction pad 7 from rattling in the circumferential direction of the disk 1 due to vibration or the like when the vehicle travels, by the rotational direction biasing portion 18 provided in the pad spring 9 on the turn-in side. During braking operation, the friction pad 7 receives braking torque (rotational torque in the direction of arrow A) received from the disk 1, and at this time, the ear 8B on the outlet side contacts the back side wall surface 4C via the guide bottom plate 24C. Since the contact continues, the braking torque at the time of brake operation can be received by the arm portion 2A (the back side wall surface 4C of the pad guide 4) on the delivery side.

  Further, the ear portions 8A and 8B of the friction pad 7 slide through the guide plate portions 13 and 24 of the pad springs 9 and 20 in the pad guides 4 and 4 positioned on the turn-in side and the turn-out side of the disc 1, respectively. It is inserted so as to be capable of being urged in the direction indicated by an arrow B in FIG. 3 by the urging pieces 15C and 26C of the radial urging portions 15 and 26. Thereby, the ear | edge parts 8A and 8B of the friction pad 7 can be elastically pressed on the upper surface boards 13A and 24A of the guide plate parts 13 and 24.

  For this reason, it is possible to restrict the friction pad 7 from rattling in the radial direction of the disk 1 due to vibration during running or the like by the radial biasing portions 15 and 26 of the pad springs 9 and 20. When the brake is operated, the inner and outer friction pads 7 are guided while the ears 8A and 8B of the friction pads 7 are kept in sliding contact with the upper surface plates 13A and 24A of the guide plates 13 and 24. It can be smoothly guided along the plate portions 13 and 24 in the axial direction of the disk 1.

  Here, taking the pad spring 9 positioned on the side of the disk 1 as an example, the radial biasing portion 15 includes a tongue plate portion 15A, a folded portion 15B, a biasing piece portion 15C, and the like. Since the urging piece portion 15C is formed as an elongated plate-like spring piece, it is possible to suppress an excessive urging force for urging the ear portion 8A of the friction pad 7 in the direction indicated by the arrow B in FIG. it can.

  In addition, since the protruding piece 15D is formed on the urging piece 15C of the radial urging portion 15, when the urging piece 15C of the radial urging portion 15 is displaced downward, the protruding piece portion 15D is in contact with the lower side wall surface 4B of the pad guide 4 and can accept external force or the like accompanying vibration in the direction of arrow C in FIG. 3, and is excessively large in the lower surface plate 13B and the rotational direction biasing portion 18 of the guide plate portion 13. Can prevent the stress from acting.

  That is, the friction pad 7 vibrates in the direction of arrow C in FIG. 3 due to the influence of braking torque or the like when the vehicle is operated, and the urging piece 15C of the radial urging portion 15 is below the guide plate portion 13. Even if the disk 1 is displaced in the radial direction so as to overlap the face plate 13B, the projecting piece 15D can be elastically brought into contact with the lower wall surface 4B of the pad guide 4 and the urging force of the radial urging part 15 can be increased. The piece 15C does not contact the lower surface plate 13B, and it is possible to prevent an excessive stress from acting on the lower surface plate 13B and the rotation direction biasing portion 18.

  Therefore, the radial biasing portion 15 of the pad spring 9 prevents the biasing piece portion 15C from deforming so as to strongly overlap the lower surface plate 13B of the guide plate portion 13 when vibration is generated as described above. In addition, the durability and life of the pad spring 9 as a whole can be improved and the reliability can be improved.

  Further, the radial urging portion 15 and the rotational urging portion 18 provided on the pad spring 9 as described above can suppress the play of the friction pad 7 in the radial direction and the rotational direction of the disk 1. 7 can be satisfactorily suppressed and occurrence of brake squealing can be prevented.

  Further, by forming a notch portion 16 having an inverted U shape between the guide bottom plate 13C of the guide plate portion 13 and the tongue piece portion 15A of the radial direction biasing portion 15, the radial biasing portion 15 is formed. It is possible to suppress the stress (strain) accompanying the elastic deformation of the guide plate 13 from being transmitted to the guide bottom plate 13C of the guide plate portion 13, and to smoothly guide (guide) the friction pad 7 in the axial direction of the disk 1 by the guide plate portion 13. I am doing so.

  However, the portion of the guide bottom plate 13C of the guide plate 13 that protrudes outside the dimension range L (see FIG. 2) of the pad guide 4 is notched at the notch 16 because the notch 16 is cut in the middle of the portion. For example, the bending rigidity in the rotation direction of the disk 1 is lowered at a peripheral position in the vicinity of 16, which causes a brake squeal and an increase in drag torque.

  Therefore, in the present embodiment, a portion of the guide bottom plate 13C of the guide plate portion 13 that protrudes outside the dimension range L (see FIG. 2) of the pad guide 4 is, for example, embossed at a position close to the notch portion 16. By performing processing or the like, the reinforcing portion 19 is formed of a concavo-convex shape portion elongated in the axial direction of the disk 1.

  Thereby, the reinforcement part 19 suppresses that the bending rigidity of the site | part close | similar to the notch part 16 among the guide bottom plates 13C of the guide plate part 13 is reduced by the notch part 16, and the guide plate part 13 (guide bottom plate 13C) can be prevented from being bent and deformed in the circumferential direction (rotation direction) of the disk 1, and its bending strength and the like can be increased.

  This also applies to the pad spring 20 on the delivery side disposed on the delivery side of the disk 1. The pad spring 20 on the delivery side is guided by the guide plate portion 24 (guide) by the respective reinforcing portions 30. The bending strength and the like of the bottom plate 24C) can be increased.

  That is, the guide plate portions 13 and 24 (guide bottom plates 13C and 24C) are guided by the reinforcing portions 19 and 30 without increasing the plate thickness or the external dimensions (the width dimension in the radial direction of the disk 1). , 24 can be easily increased in bending rigidity. As a result, when the brake operation is released and the friction pad 7 is about to slide and displace toward the axially outer side (standby position) of the disk 1, the guide bottom plates 13C and 24C of the guide plate portions 13 and 24 are cut off. It is possible to prevent the disk 1 from being bent so as to be bent in the circumferential direction (rotation direction) of the disk 1 around the notches 16 and 27.

  Therefore, according to the present embodiment, the friction pad 7 can be smoothly returned to the standby position by the radial urging portions 15 and 26 of the pad springs 9 and 20 when the brake operation is released. The return operation can be stabilized, the bending rigidity of the pad springs 9 and 20 can be easily increased, and pad dragging and brake noise can be prevented.

  Further, by increasing the bending rigidity of the pad springs 9 and 20 (guide plate portions 13 and 24), deformation when the pad springs 9 and 20 are assembled to the pad guide 4 and the like of the mounting member 2 can be suppressed to be small. The work at the time of assembly can be improved.

  In addition, the reinforcing portions 19 and 30 are formed at portions of the guide plate portions 13 and 24 of the pad springs 9 and 20 that protrude outward in the axial direction of the disk 1 from the pad guide 4 (dimension range L shown in FIG. 2). Therefore, when the guide plate portions 13 and 24 of the pad springs 9 and 20 are fitted and attached to the pad guide 4 of the attachment member 2, the reinforcing portions 19 and 30 formed by, for example, embossing or the like are used as the pad guide. 4 can be prevented from coming into contact with or interfering with the rear side wall surface 4 </ b> C, and the guide plate portions 13 and 24 can be stably assembled in the pad guide 4.

  The pad spring 9 has a slit-shaped notch 16 formed between the lower surface plate 13B of the guide plate portion 13 and the tongue plate portion 15A of the radial biasing portion 15, so that the radial biasing is performed. The portion 15 and the rotational direction biasing portion 18 can be elastically deformed independently of each other, and for example, the deformation of the radial direction biasing portion 15 can be prevented from affecting the rotational direction biasing portion 18.

  For this reason, it is possible to prevent excessive stress from acting on the radial direction urging portion 15 and the rotational direction urging portion 18 and to suppress the occurrence of stress concentration and the like. In addition, the urging forces of the radial urging portion 15 and the rotational urging portion 18 on the friction pad 7 can be made independent of each other, and the pad posture can be stabilized.

  In the above-described embodiment, the case where the reinforcing portions 19 and 30 are formed by embossing the guide bottom plates 13C and 24C of the guide plate portions 13 and 24 so as to be recessed has been described as an example. However, the present invention is not limited to this, and may be a reinforcing portion that has a convex shape when viewed from the front surface of the guide bottom plates 13C and 24C and is recessed into a concave shape when viewed from the back surface. Moreover, it is good also as a structure which provides the reinforcement part which consists of a separate rib-shaped protrusion etc. in a guide board part (for example, guide bottom board 13C, 24C).

  Further, the reinforcing portions 19 and 30 have been described by taking as an example a case where the reinforcing portions 19 and 30 are configured by a substantially I-shaped concavo-convex shape portion elongated in the axial direction of the disk 1. However, the present invention is not limited to this. For example, the reinforcing portion may be formed by extending in a direction inclined obliquely with respect to the axial direction of the disk 1.

  Moreover, in the said embodiment, the case where the rotation direction urging | biasing part 18 was provided in the pad spring 9 by the side of an entrance was mentioned as an example, and was demonstrated. However, the present invention is not limited to this, and, for example, a pad spring that does not have a rotation direction urging portion or the like, similar to the pad spring 20 on the delivery side, may be used on the entry side.

  Further, in the above embodiment, the case where the pad springs 9 and 20 are formed in a substantially U shape so as to straddle the outer peripheral side of the disk 1 has been described as an example. However, the present invention is not limited to this. For example, two pad springs having a shape such that the pad springs 9 and 20 are separated at the intermediate positions of the connecting plate portions 10 and 21 are connected to the inner side and the outer side of the disc 1. It is good also as a structure each arrange | positioned.

1 is a front view of a disc brake according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of a mounting member, a friction pad, and a pad spring as viewed from the direction of arrows II-II in FIG. 1 with the caliper removed. FIG. 3 is an enlarged cross-sectional view of a pad guide, a pad spring, a friction pad, and the like of the mounting member as seen from the direction of arrows III-III in FIG. 2. It is a front view which shows the pad spring in FIG. 2 as a single body in the state before elastic deformation. FIG. 5 is an enlarged side view of the pad spring as seen from the direction of arrows VV in FIG. 4. It is an expanded sectional view which looked at the pad spring from the arrow VI-VI direction in FIG. It is a front view of the pad spring which shows the state which bent the radial direction biasing part in FIG. 4 on the lower surface board of a guide plate part. It is the perspective view which looked at the pad spring of FIG. 4 in the state before elastic deformation from the diagonal. It is a perspective view of the pad spring which shows the state which bent the radial direction biasing part in FIG. 8 on the lower surface board of a guide plate part. It is a perspective view which shows the pad spring of the delivery side as a single body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disc 2 Mounting member 2A Arm part 3 Disc pass part 4 Pad guide 5 Caliper 6 Sliding pin 7 Friction pad 8 Back metal 8A, 8B Ear | edge part (convex part)
9, 20 Pad spring 13, 24 Guide plate portion 13A, 24A Top plate 13B, 24B Bottom plate 13C, 24C Guide bottom plate 15, 26 Radial urging portion 15A, 26A Tongue piece portion 15B, 26B Folded portion 15C, 26C One part 16, 27 Notch part 19, 30 Reinforcing part

Claims (3)

A mounting member having a pair of arms that are spaced apart in the rotational direction of the disk and straddling the outer periphery of the disk in the axial direction, and a pad guide provided on each arm, and sliding on each arm of the mounting member A caliper that can be provided, a pair of friction pads that are slidably attached to each arm portion of the attachment member via the pad guide and pressed against both sides of the disk by the caliper, and each arm of the attachment member In a disc brake comprising pad springs that are attached to the respective parts and elastically support the friction pads between the arms,
The pad spring is
A guide plate portion that is fitted and attached to a pad guide of the mounting member to guide the friction pad in the axial direction, and extends and extends outward in the axial direction of the disc from the pad guide;
The base end side is integrally formed with the guide plate portion, and the tip end side is elastically deformed, and extends between the guide plate portion and the friction pad in the axial direction of the disc, thereby moving the friction pad outward in the radial direction of the disc. A radial urging portion that urges elastically toward,
In order to prevent the influence of elastic deformation of the radial urging portion from reaching the guide plate portion, a notch portion provided between the proximal end side of the radial urging portion and the guide plate portion;
A disc brake comprising: a reinforcing portion that is provided in the guide plate portion at a position close to the notch portion and that suppresses the guide plate portion from being bent and deformed in the rotation direction of the disc.   2. The disc brake according to claim 1, wherein the reinforcing portion is formed by a concavo-convex shape portion formed by partially denting the guide plate portion and extending in the axial direction of the disc.   3. The disc brake according to claim 1, wherein the reinforcing portion is formed in a portion of the guide plate portion that protrudes outward in the axial direction of the disc from the pad guide.

Images