JP2008138781A - Grinding method for brake pad and lining of the same pad - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain uniform surface pressure distribution of a brake pad applied to a disk brake of a railroad car, and to provide a simple structure having fewer components. <P>SOLUTION: A lining 6 slidably connected with a disk rotor is installed on a support member 5, and a mounting section 8 arranged in the center of the support member 5 is installed on a pad back plate 2. A space 11 is arranged between the support member 5 and lining 6 in the vicinity of the mounting section 8 of the support member 5 against the pad back plate 2, and push force of the lining 6 is performed at the outer peripheral side of the lining at the time of an operation of the brake so that the installation of the lining 6 to the support member 5 is carried out at the outer peripheral side of the lining 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a brake pad suitable for use in a large-sized disc brake represented by a railway vehicle, in particular, a high-speed railway disc brake having a large load, and a polishing method for a lining of the pad.

  In order to equalize the surface pressure (pressing pressure per unit area) distribution of a large brake pad pressed against the disk rotor in a railway vehicle disk brake, the lining (friction material) is divided into multiple parts and the pad back plate (See Patent Documents 1 and 2 below).

  In Patent Document 1, the lining is attached to the substrate (pad back plate) so as to be tilted, and the lining moves in a direction approaching the substrate while allowing the tilting displacement of the lining between the lining and the substrate. The structure which provides the elastic member which makes possible and stops inclination displacement when the lining is not required with the elastic member is disclosed.

  Further, in Patent Document 2, a plurality of linings are pivotably attached to one support plate, and a holding member penetrating the lining and the support plate is urged by a spring so that each lining is individually elastically applied to the support plate. Further, a structure is disclosed in which the support plate is pivotably held by a support (pad back plate, etc.), and the support plate is also urged by a spring similarly to the lining and is elastically pressed against the support. Yes.

In both Patent Documents 1 and 2, each of the divided linings can be swung with a central mounting portion as a fulcrum, and the frictional surface run-out of the disk rotor caused by thermal deformation (in the axial direction of the surface) The effect of uniforming the surface pressure distribution is made to follow the lining in accordance with the variation of the displacement and the inclination of the surface), and a method for achieving the purpose of uniforming the surface pressure is common.
JP 2006-207625 A Japanese National Patent Publication No. 10-507250

  In the structures disclosed in Patent Documents 1 and 2, the pressing force at the time of brake operation is transmitted to the lining via the attachment portion at the center of the lining. Therefore, the surface pressure of the pad is increased in the central portion of the lining compared to the outer peripheral portion of the lining, and the surface pressure tends to be reduced because the lining is bent so that the outer peripheral side escapes in the direction opposite to the pressing direction. There is a limit to the effect of uniform surface pressure distribution.

  In both cases, the lining is held so that it can swing, and the posture of the swinging lining is restored, the swing of the lining during non-braking, and the tilt is prevented by the spring force. Increases in assembly, man-hours for assembly, and difficulty in assembly are inevitable, resulting in increased costs.

  An object of the present invention is to make it possible to make the surface pressure distribution of the brake pad more uniform, and to realize the object with a simple structure with a small number of parts.

  In order to solve the above problems, in the present invention, a brake pad for a disc brake is configured as follows. Specifically, a lining to be brought into sliding contact with the disk rotor is attached to the support member, and further, the central portion of the support member is attached to the pad back plate. Further, a space is provided between the support member and the lining in the vicinity of the attachment portion of the support member to the pad back plate, and the lining is attached to the support member at the outer peripheral portion of the lining.

Preferred forms of this brake pad are listed below.
(1) The space is sized so as to absorb the bending of the support member due to the pressing force during brake operation. The bending of the support member referred to here is the amount of bending in the axial direction, and the size of the space (axial dimension) is set to be equal to or greater than the assumed maximum amount of bending in the axial direction of the supporting member. It is preferable.
(2) The support member is fixed so as not to move with respect to the pad back plate.
(3) An air passage that communicates the space with the outside is provided in at least one of the lining and the support member.
(4) The support member and the lining constitute a segment assembly, and a plurality of the segment assemblies are attached to one pad back plate.

  The brake pads having the structure (4) are fixedly attached to the pad back plate so that the segment assembly composed of the support member and the lining does not move, and then the pad back plate is used as a position reference. It is preferable to polish the brake pad lining by a method in which the friction surfaces of the linings of each segment assembly are polished to align the friction surfaces of the segment assemblies. The present invention also provides such a polishing method.

  In the brake pad according to the present invention, since a space is provided between the support member and the lining in the vicinity of the attachment portion of the support member to the pad back plate, the pressing force applied to the support member from the pad back plate via the attachment portion during braking Is transmitted from the support member to the outer peripheral side of the lining.

  When a pressing force is applied, the support member bends so that the central portion with the attachment portion protrudes in the pressing direction. However, since there is a space between the support member and the lining in the central portion with the attachment portion, the support member is lined with the lining. The pressing force is not transmitted to the lining, and the lining is pressed only on the outer peripheral side. In this way, when the lining is pressed on the outer peripheral side in this way, bending (warping) is suppressed, and for this reason, an effect of uniforming the surface pressure distribution over the prior art can be expected.

  Further, by providing a space between the support member and the lining, a heat dissipation effect and a heat insulation effect between the support member and the lining can be expected. The heat radiation effect and heat insulation effect by the space are particularly remarkable when the air passage is provided in the lining or the support member and the space communicates with the outside.

  In addition, since a space is provided between the support member and the lining and the support member is simply fixed to the pad back plate, a complicated structure, an increase in the number of parts, and an increase in assembly man-hours are avoided, leading to an increase in cost. There is nothing.

  When a segment assembly is constituted by the support member and the lining and a plurality of the segment assemblies are attached to one pad back plate, the effect of uniforming the surface pressure by dividing the lining can be expected.

  Since a plurality of brake pads, each of which has a segment assembly fixed to one pad back plate, are held by the pad back plate so that the segment assemblies do not move, the friction surface of each segment assembly is easily polished. Also, since the friction surface can be polished by the polishing method of the present invention based on the position of the pad back plate, the position of the friction surface of each segment assembly can be aligned with high precision, and the surface pressure distribution between the segment assemblies The variation of the is suppressed small.

  Embodiments of a brake pad according to the present invention will be described below with reference to FIGS. 1 to 6 of the accompanying drawings. FIG. 1 is an example of a brake pad employed in a railway vehicle disc brake. The brake pad 1 is configured by fixing a plurality of segment assemblies 3 to a pad back plate 2 by fastening members 4.

  As shown in FIG. 2, the segment assembly 3 includes a support member 5 and a lining 6 that is in sliding contact with the disk rotor D (see FIG. 3). The support member 5 has a mounting portion 8 formed around the shaft hole 7 at the center of the back surface, and has a recess 9 in a region excluding the outer peripheral portion of the front surface. The attachment portion 8 protrudes rearward from the back surface of the support member 5, and the protruding end of the attachment portion 8 is abutted against the front surface of the pad back plate 2, and the segment assembly 3 is fixed to the pad back plate 2 in this state. The Therefore, a gap 12 is formed between the back surface of the support member 5 and the pad back plate 2 on the outer peripheral side of the attachment portion 8.

  The segment assembly 3 used for the brake pad 1 of FIG. 1 has a circular shape in front view, and the shape in front view can be selected from any shape such as a square or an ellipse.

  The fastening member 4 is a rivet here. Instead of the rivet, other fastening elements such as bolts may be used. In short, it is sufficient that the segment assembly 3 can be fixed to the pad back plate 2.

The lining 6 has an integrated lining back plate 6b, and has an opening 10 penetrating in the thickness direction in the center. 6a is a friction surface pressed against the disc rotor. Although the opening 10 is provided for fastening work by the fastening member 4, as shown in FIG. 4, a bolt or the like is adopted as the fastening member 4, and the head of the fastening member is planted on the support member 5 in advance. Thus, the segment assembly 3 can be fixed to the pad back plate 2 without the opening 10. Omitting the opening 10 leads to an increase in the area of the friction surface 6a.

  The support member 5 and the lining back plate 6b are both made of metal. In the illustrated brake pad, the support member 5 and the lining back plate 6b are fixed to each other by spot welding. The support member 5 and the lining back plate 6b may be fixed to each other using fastening elements such as rivets and bolts.

  A space 11 is created between the support member 5 and the lining back plate 6b by a recess 9 provided on the front surface of the support member 5. The space 11 is formed in the vicinity of the attachment portion 8, that is, in the central region of the lining 6, and the attachment of the lining 6 to the support member 5 is performed only on the outer peripheral portion of the lining 6.

  The space 11 has a size capable of absorbing the amount of bending in the axial direction of the support member 5 due to the pressing force at the time of the brake operation, and the support member 5 is bent by the pressing force at the time of the brake operation as shown in FIG. Even if the central portion of the member protrudes in the pressing direction, the protruding portion does not contact with the lining back plate 6b with such a strong pressure that the surface pressure distribution is affected. Depending on the size of the space 11, the non-contact state of the support member 5 with respect to the lining 6 is maintained in the space forming portion. Therefore, the pressing force applied to the support member 5 from the pad back plate 2 via the attachment portion 8 is applied. Is transmitted from the support member 5 to the outer peripheral side of the lining 6, and only the outer peripheral side of the lining 6 is pressed.

  In this way, by pressing the outer peripheral side of the lining 6, bending (warping) of the lining is suppressed, and the entire area of the lining 6 is pressed against the disc rotor D on average, so that the surface pressure distribution of the brake pad 1 is increased. It is made uniform. This is an effect caused by forming the space 11. By providing this space 11, the segment assembly 3 can be fixed to the pad back plate 2 to simplify the structure and reduce the number of components.

  The space 11 provided between the support member 5 and the lining 6 also functions to improve heat dissipation and heat insulation between the support member and the lining 6. The heat radiation effect and heat insulation effect by the space 11 are particularly remarkable because the air inside and outside is switched when the space 11 communicates with the outside.

  The segment assembly 3 shown in FIG. 2 has an opening 10 in the lining 6 for the purpose of performing a fastening operation by the fastening member 4, and the opening 10 functions as an air passage 13 that communicates the space 11 with the outside, and has a higher heat dissipation effect. And heat insulation effect.

A structure in which the cutout portion 14 shown in FIG. 5 and the convex portion 15 shown in FIG. 6 are provided on the outer periphery of the support member 5, or the fixing of the support member 5 to the lining back plate 6 b is spaced at intervals in the circumferential direction. Even in the structure performed in the above, the space 11 can be communicated to the outside by generating a gap in which air moves in the non-joined portion between the fixed portions (in this invention, the minute gap is also regarded as an air passage).

  Disk brakes for heavy-duty high-speed railways, etc., have a larger temperature rise of the disk rotor due to frictional heat than disk brakes with a small load, and the friction surface of the disk rotor is heated especially when severe braking is applied. It is conceivable that the friction surface is shaken due to the rotation of the rotor due to distortion. In order to make the friction surface of the lining follow the runout, the brake pads disclosed in Patent Documents 1 and 2 are configured such that the lining can be swung with respect to the pad back plate.

  If the brake pad of the present invention is provided with the same function, it is considered that the surface pressure distribution can be made more uniform. However, in the present invention, the lining 6 is fixed to the pad back plate 2 and does not swing. Therefore, as an alternative method, the rigidity of the pad back plate 2 and the mounting portion 8 of the support member 5 is reduced within a range in which the reliability of the brake device is not impaired, and the portion where the rigidity is reduced is elastically deformed. Conceivable. Since the thermal strain of the friction surface of the disk rotor does not become extremely large, the lining can be slightly shaken to follow the friction surface of the disk rotor even by a method of elastically deforming the pad back plate 2 or the support member 5. .

  The present invention is effective even if it is applied to a brake pad that is not divided into linings. However, when the invention is applied to a brake pad that is divided into a plurality of linings and attached to the pad back plate, the surface by dividing the lining. The effect of uniform pressure distribution is also obtained, and more excellent braking characteristics can be expected.

  Since the brake pads disclosed in Patent Documents 1 and 2 can swing each of the divided linings, there is no position reference when polishing the friction surface of the lining. Although it is difficult to align the friction surfaces of the lining, the brake pads of the present invention are held by the pad back plate 2 so that the segment assemblies 3 do not move, so that the friction surfaces of the segment assemblies 3 can be easily polished. Further, the friction surface can be polished by the polishing method of the present invention based on the position of the pad back plate 2, and the position of the friction surface of each segment assembly 3 can be aligned with high accuracy by polishing by this method. Variation in surface pressure distribution between the two can be reduced.

The front view which shows embodiment of the brake pad of this invention Fig. 1 is an enlarged sectional view of the segment assembly used in the brake pad in Fig. 1 Sectional drawing which shows the state which pressed the segment assembly of FIG. 2 against the disk rotor Sectional drawing which shows the other example of the segment assembly attachment to a pad back plate (A) Sectional drawing which shows the other example of the segment assembly which released the space outside, (b) The perspective view of the supporting member employ | adopted as the segment assembly (A) Cross-sectional view showing still another example of the segment assembly with the space released to the outside, (b) Perspective view of the support member employed in the segment assembly

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Brake pad 2 Pad back plate 3 Segment assembly 4 Fastening member 5 Support member 6 Lining 6a Friction surface 6b Lining back plate 7 Shaft hole 8 Attaching part 9 Recess 10 Opening 11 Space 12 Gap 13 Air passage 14 Notch 15 Protrusion

Claims (6)

  A lining (6) slidably contacting the disk rotor (D) is attached to the support member (5), and the center portion of the support member (5) is further attached to the pad back plate (2). A brake pad, wherein a space (11) is provided between the support member (5) and the lining (6) in the vicinity of the attachment portion (8) of the support member (5) with respect to the pad back plate (2). A brake pad in which the lining (6) is attached to the member (5) on the outer peripheral side of the lining (6).   The brake pad according to claim 1, wherein the space (11) is sized so as to absorb the bending of the support member (5) due to a pressing force during brake operation.   The brake pad according to claim 1 or 2, wherein the support member (5) is fixed so as not to move with respect to the pad back plate (2).   The brake pad according to any one of claims 1 to 3, wherein an air passage (13) for communicating the space (11) with the outside is provided in at least one of the lining (6) and the support member (5).   The support member (5) and the lining (6) constitute a segment assembly (3), and a plurality of the segment assemblies (3) are attached to one pad back plate (2). Brake pads as described in   A lining (6) to be brought into sliding contact with the disk rotor (D) is attached to the support member (5), and the support member (5) is attached to the pad back plate (2). A space (11) is provided between the support member (5) and the lining (6) in the vicinity of the attachment portion (8) of 5), and the lining (6) is attached to the support member (5). The disc brake pad lining (6) polishing method performed on the outer peripheral side of the segment assembly (3) composed of the support member (5) and the lining (6) is a pad back plate (2). ) And fixed to prevent movement, and then the friction surface (6a) of the lining of each segment assembly is polished with reference to the pad back plate (2) as a position reference to each segment assembly. Linings polishing method of the brake pad, characterized in that for aligning the friction surface of yellowtail (3) (6a).

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