JP4638248B2 - Disc pad - Google Patents

Description

  The present invention relates to a disk pad used for a disk brake of a high-speed railway vehicle.

2. Description of the Related Art Conventionally, as disclosed in Patent Document 1 below, a disk pad used for a railway vehicle disk brake is generally provided with a lining that is pressed against a brake disk and a substrate that supports the lining. Known to. 5, a recess 83 is formed in the substrate 82, and a ring-shaped elastic member 84 is disposed in the recess 83, and the elastic member 84 is connected to the substrate 82. A lining 81 is fitted in the recess 83 so as to be sandwiched between the two. When the lining 81 is pressed against the brake disc 85 during the braking operation, the lining 81 is displaced with respect to the substrate 82.
German Patent DE4301006C2

  In a high-speed railway vehicle, the temperature of the lining 81 reaches about 800 ° C. during braking operation. Therefore, if the elastic member 84 in contact with the lining 81 is made of a steel material, the temperature rises to a temperature close to the quenching temperature. Become. For this reason, in the said conventional thing, the elastic member 84 is annealed and deform | transformed by the temperature rise of the lining 81, and there exists a problem that the elastic member 84 stops exhibiting elasticity.

  Therefore, the present invention has been made in view of such a point, and an object of the present invention is to enable an elastic member close to the lining to maintain elasticity even when the lining is heated.

In order to achieve the above object, the present invention is based on the premise of a disk pad in which a lining is assembled to a substrate, and is arranged between the substrate and the lining, and the inclination displacement of the lining is reduced by pressing against a brake disc. An elastic member that enables movement of the lining in a direction approaching the substrate, and a heat transfer suppression member disposed between the elastic member and the lining, and the heat transfer suppression member Are provided with a contact portion that is pressed against the lining by the elastic member, and an extending portion that extends from the contact portion while being separated from the lining .

  In this configuration, even when the lining is heated by friction with the brake disk during the braking operation, it is possible to suppress the heat from being transmitted to the elastic member. As a result, it is possible to make it difficult to raise the temperature of the elastic member, so that it is possible to easily suppress the temperature of the elastic member from rising to a temperature at which it loses elasticity. Moreover, since the lining can be displaced and moved along the brake disk by the elastic member, it is possible to reduce the local surface pressure increase of the lining and improve the life of the lining. be able to.

And even if the heat transfer to the extension part is made directly from the lining, it is made mainly by heat conduction from the contact part. For this reason, it becomes possible to release the heat directly received from the lining by the contact portion of the heat transfer suppressing member to the extending portion, and the temperature rise of the contact portion of the heat transfer suppressing member can be suppressed. As a result, the temperature rise of the elastic member that is in contact with the contact portion can be more efficiently suppressed.

Before SL and linings and an elastic member is provided with a plurality each of the heat transfer suppressing member may be provided so as to straddle the respective lining.

  In this configuration, the number of steps for assembling the heat transfer suppressing member can be reduced.

  Further, the lining is provided with a through-hole having a stepped portion, and a holding member having a head portion that can be engaged with the stepped portion is provided, and the lining is formed by the elastic force of the elastic member. It is good also as a structure hold | maintained in the state with which the level | step-difference part of the said through-hole was hold | maintained by contact | abutting to the head of the said holding member, pressing in the direction away from a board | substrate.

  In this configuration, while the lining is pressed by the elastic member, the step portion of the through hole formed in the lining is engaged with the head of the holding member to prevent the lining from coming off. While permitting, the substrate and the lining can be securely coupled so that the elastic member does not separate the lining from the substrate.

  Further, the substrate is formed with a concave curved seat so as to surround a portion to which the holding member is fixed, and the lining has a cylindrical portion having a convex tip surface disposed to face the curved seat. The lining may be held by the holding member while having a gap between the cylindrical portion and the curved seat.

  In this configuration, when the lining is pressed against the brake disk during a braking operation and an external force of a predetermined value or more is applied to the elastic member, the cylindrical portion of the lining and the curved surface seat of the substrate come into contact with each other. At this time, the lining can move so that its front end surface is along the curved seat, so that when the cylindrical portion of the lining comes into contact with the curved seat of the substrate, the lining inclination displacement is changed according to the force received by the lining. Is possible. And since the external force which acts on lining at the time of a brake operation is shared not only by an elastic member but by the curved seat of a board | substrate, the burden of an elastic member can be reduced.

  The holding member includes a main body having a smaller diameter than the head. The main body is disposed between the abutting portion that abuts against the substrate and the abutting portion and the head. An intermediate portion having a smaller diameter than the contact portion, and a gap width between the contact portion of the holding member and the cylindrical portion is smaller than a gap width between the head portion of the holding member and the lining. It is good also as the structure currently formed.

  In this configuration, when the lining is tilted and displaced, the contact portion of the holding member and the cylindrical portion of the lining come into contact. At the time of this contact, a shear stress and a bending stress act on the contact portion. By providing this contact portion near the substrate, the influence of the bending stress can be reduced.

  Further, a detent means for preventing the lining from rotating when pressed against the brake disc may be provided.

  With this configuration, it is possible to avoid wear of the lining and the heat transfer suppressing member as the lining rotates.

  As described above, according to the present invention, since the heat transfer suppressing member is arranged between the elastic member and the lining, even if the temperature of the lining rises, the elastic member adjacent to the lining has elasticity. Can be held.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a disk pad 10 according to an embodiment of the present invention. The disk pad 10 is used for a disk brake of a high-speed railway vehicle, and a plurality of disk pads 10 are arranged along the rotation direction of a brake disk (not shown). As shown in FIG. 1, the disk pad 10 includes a substrate 12 and a lining 14 assembled to the substrate 12.

  The substrate 12 is formed in a flat plate shape having an elongated shape extending in a specific direction in plan view, and both end portions in the length direction are each formed in a substantially triangular shape. The substrate 12 is installed in such a posture that its length direction is along the rotation direction of the brake disc.

  As shown in FIG. 2, the substrate 12 has a plurality of through holes 16 penetrating in the thickness direction. The through-holes 16 are provided at a site where the lining 14 is installed, and the through-holes 16 are formed as many as the number of linings 14 to be assembled. Each through hole 16 is formed in a shape in which the lower end portion in FIG.

  A curved seat 18 having a concave curved surface is formed around each through-hole 16 on the front surface (upper surface in FIG. 2) of the substrate 12 on which the lining 14 is disposed. The curved seat 18 is constituted by a circular depression in plan view, and the curved surface of the upper surface thereof is a seating surface 18a. And the said through-hole 16 is formed in the center of this curved-surface seat 18, respectively.

  As shown in FIG. 1, the linings 14 are arranged in two rows in the width direction except for both ends in the length direction of the substrate 12, and one lining 14 is arranged at each end of the substrate 12. . And each lining 14 is arrange | positioned in the state mutually spaced apart. In the illustrated example, a two-row arrangement is shown, but three rows may be arranged in the width direction by reducing the diameter of the lining 14.

  Each lining 14 is formed in a disk shape as shown in FIGS. 1 and 2. Although not shown, each lining 14 may be formed in a polygonal shape such as a triangle, pentagon, or hexagon. In this case, the apex portion may be formed in a smooth curved surface.

  The lining 14 has a pressing surface 20 whose front surface (the end surface on the side away from the substrate 12) is pressed against the brake disc. Each of these linings 14 is formed with a through-hole 22 that penetrates the central portion vertically (in the thickness direction). The through hole 22 faces the through hole 16 of the substrate 12.

  Each through hole 22 is formed by a stepped hole having a small diameter on the substrate 12 side, and a small diameter portion 22b and a large diameter portion 22c are formed with a stepped portion 22a interposed therebetween. The small diameter portion 22b is formed on the substrate 12 side of the stepped portion 22a, and the large diameter portion 22c is formed on the pressing surface 20 side.

  Each lining 14 includes a main body portion 24 that is formed to have a substantially constant thickness and is configured to be able to contact the brake disc, and a cylindrical portion 26 that extends from the main body portion 24 toward the substrate 12. . The through hole 22 is formed in the main body portion 24, and the cylindrical portion 26 is formed on the lower end surface of the main body portion 24 so as to surround the through hole 22, and is disposed so as to face the curved seat 18. Yes.

  A front end surface (lower end surface) 26 a of the cylindrical portion 26 is formed as a convex curved surface corresponding to the seat surface 18 a of the curved surface seat 18 of the substrate 12. In other words, the front end surface 26a of the cylindrical portion 26 is formed in an arc surface such that the axial center of the cylindrical portion 26 is the center of rotation. The lining 14 is arranged so that a gap is formed between the tip end surface 26 a of the cylindrical portion 26 and the seat surface 18 a of the curved seat 18. Thereby, when the front end surface 26a of the cylindrical part 26 contacts the seat surface 18a of the curved seat 18, it can be displaced along the curved seat 18 in this contacted state.

  The substrate 12 and the lining 14 are coupled by a rivet 30 as an example of a holding member. The rivet 30 includes a head 32 for retaining and a main body 34 having a smaller diameter than the head 32, and is inserted across the through hole 16 of the substrate 12 and the through hole 22 of the lining 14. ing.

  The head portion 32 has a smaller diameter than the large diameter portion 22c of the through hole 22 in the lining 14 and a larger outer diameter than the small diameter portion 22b. The lower end surface of the head 32 is in contact with the upper surface (contact surface) of the step portion 22 a in the through hole 22 of the lining 14 from above. As a result, the lining 14 is prevented from coming off by the rivet 30.

  The main body portion 34 includes a contact portion 34a that is in contact with the substrate 12 and an intermediate portion 34b that is disposed between the head portion 32 and the contact portion 34a.

  The intermediate portion 34b has an outer diameter that is smaller than both the head portion 32 and the contact portion 34a. In other words, the contact portion 34a is configured to have a larger diameter than the intermediate portion 34b.

  The contact portion 34 a has an outer diameter smaller than that of the head portion 32, and the lower end portion of the contact portion 34 a is in contact with the curved surface seat 18 of the substrate 12.

  The main body portion 34 is provided with a fastening portion 36 that extends downward from the lower end portion of the contact portion 34 a and is disposed in the through hole 16 of the substrate 12. The fastening portion 36 has a lower diameter, and the rivet 30 is fixed to the substrate 12 by sandwiching the substrate 12 between the lower portion of the fastening portion 36 and the contact portion 34a.

  The distance from the lower end surface of the head portion 32 to the lower end surface of the contact portion 34a is slightly longer than the distance from the upper surface of the step portion 22a to the tip of the cylindrical portion 26. As a result, a slight gap is formed between the front end surface 26 a of the cylindrical portion 26 and the seat surface 18 a of the curved seat 18 in a state where the lining 14 is coupled to the substrate 12.

  A gap width S1 between the contact portion 34a and the cylindrical portion 26 is formed to be smaller than a gap width S2 between the head portion 32 and the inner peripheral surface of the large diameter portion 22c of the through hole 22. This is because, when the lining 14 is inclined, the inner peripheral surface of the cylindrical portion 26 is brought into contact with the outer peripheral surface of the contact portion 34a before the inner peripheral surface of the through hole 22 contacts the outer peripheral surface of the head portion 32. This is to make contact.

  Elastic members 40 are respectively disposed between the substrate 12 and the linings 14. As shown in FIG. 3, each elastic member 40 is constituted by a metal disc spring, and is a dish-like member having a bottom surface formed as an opening 40a. The elastic member 40 is disposed between the substrate 12 and the lining 14 with the cylindrical portion 26 inserted through the opening 40a.

  The elastic member 40 causes a resilient force to act on the substrate 12 and the lining 14 in a direction away from each other. The elastic member 40 has an elastic coefficient such that the elastic member 40 is elastically deformed during a braking operation in which the lining 14 is pressed against the brake disk. Thereby, when the lining 14 presses the brake disc, the lining 14 is elastically deformed by the pressing force transmitted to the elastic member 40 through the lining 14, so that the lining 14 is displaced in the vertical direction or tilted. It has become.

  A heat transfer suppression member 44 is disposed between the lining 14 and the elastic member 40. The heat transfer suppression member 44 is configured by a plate material having the same shape and size as the substrate 12 in plan view, and the heat transfer suppression member 44 is provided so as to straddle each lining 14. In addition, since the board | substrate 12 is arrange | positioned at the back side of the heat-transfer suppression member 44, the board | substrate 12 is not directly displayed in FIG.

  The heat transfer suppression member 44 includes a contact portion 44a provided corresponding to each lining 14, and an extending portion 44b provided between the contact portions 44a. Each contact portion 44 a is an annular portion having an inner diameter slightly larger than that of the cylindrical portion 26 and having an outer diameter substantially the same as the upper end portion of the elastic member 40. The heat transfer suppression member 44 is disposed on the lower surface of the lining 14 with the tubular portion 26 inserted through the opening of the contact portion 44a, and the contact portion 44a and the lining 14 are in contact with each other.

  The extending portion 44b is a portion configured to connect the contact portions 44a to each other, and extends from each contact portion 44a in a step shape. Thereby, the extension part 44b is separated from the lower surface of the lining 14 and extends in a direction substantially parallel to the lower surface of the lining 14 in that state.

  The heat transfer suppressing member 44 is made of a material having a lower thermal conductivity than the lining 14. The heat transfer suppressing member 44 is made of, for example, a stainless steel plate having a lower thermal conductivity than cast iron that forms a portion (lower end) on the substrate 12 side in the lining 14.

  The disk pad 10 according to the present embodiment is provided with a detent means 48 for the lining 14. The anti-rotation means 48 includes a pin 49 disposed between the substrate 12 and the lining 14, an engagement groove (concave portion) 50 provided in the lining 14, and an engagement hole 51 provided in the substrate 12. It is configured. That is, the engaging groove 50 and the engaging hole 51 are arranged to face each other, and the upper end portion of the pin 49 is inserted into the engaging groove 50, while the lower end portion of the pin 49 is in the engaging hole 51. Is placed in the insert. Thereby, the pin 49 is engaged with the inner peripheral surface of the engagement groove 50 and the inner peripheral surface of the engagement hole 51, and the lining 14 is prevented from rotating.

  The heat transfer suppressing member 44 is provided with an insertion hole 44c through which the pin 49 is inserted. The insertion hole 44c is inserted through the pin 49 so that the pin 49 can be joined to both the substrate 12 and the lining 14 because the heat transfer suppressing member 44 is disposed between the substrate 12 and the lining 14. belongs to.

  The operation of the disk pad 10 configured as described above will be described.

  In the present disc pad 10, when the brake is not operating when the lining 14 is not pressed against the brake disc, the lining 14 has a gap between the tubular portion 26 and the curved seat 18 of the substrate 12 due to the elastic force of the elastic member 40. Is held in a formed state. At this time, the step portion 22 a in the through hole 22 of the lining 14 is engaged with the head portion 32 of the rivet 30, so that the lining 14 is not detached from the substrate 12.

  When the lining 14 is pressed against the brake disk (during brake operation), the same state as that when the brake is not operated is maintained until the pressing force reaches a value equivalent to the elastic force of the elastic member 40. However, when the pressing force becomes larger than the elastic force of the elastic member 40, the elastic member 40 is elastically deformed. Due to the elastic deformation of the elastic member 40, the lining 14 moves in a direction approaching the substrate 12.

  When the lining surface height at the time of a new article is not uniform, only the protruding lining 14 is pressed against the brake disc, but the cylindrical portion 26 corresponding to the protruding lining 14 contacts the curved seat 18. As a result, it is possible to prevent the elastic member 40 of the lining 14 from being plastically deformed due to a large deformation and to prevent the elastic force from subsequently decreasing. Then, the front end surface 26a of the cylindrical portion 26 is displaced along the seat surface 18a of the curved seat 18 by the contact, so that the lining 14 is inclined and displaced. At this time, the gap width S1 between the contact portion 34a and the tubular portion 26 is formed smaller than the gap width S2 between the head portion 32 and the inner peripheral surface of the through hole 22 large diameter portion 22c of the lining 14. Therefore, the inner peripheral surface of the cylindrical portion 26 contacts the outer peripheral surface of the contact portion 34a and is maintained in that state. Even when the lining 14 is tilted, the stepped portion 22a is engaged with the head portion 32 of the rivet 30, so that the lining 14 is not displaced further upward (in a direction away from the substrate 12). Since the heat transfer suppressing member 44 is interposed between the lining 14 and the elastic member 40 during the braking operation, even if the temperature of the lining 14 rises due to friction with the brake disk, the heat is transferred to the elastic member 40. Is suppressed.

  As described above, according to the present embodiment, even when the lining 14 is heated by friction with the brake disk during the braking operation, it is possible to suppress the heat from being transmitted to the elastic member 40. As a result, it is possible to make it difficult to raise the temperature of the elastic member 40, so that it is possible to easily prevent the elastic member 40 from being heated to a temperature at which the elastic member 40 is annealed and loses elasticity. Can be prevented from losing elasticity. In addition, since the lining 14 can be tilted and moved along the brake disk by the elastic member 40, a local increase in surface pressure can be reduced and the life of the lining 14 can be improved.

  In particular, in the present embodiment, since it is difficult to transfer heat directly from the lining 14 to the extending portion 44b, it becomes possible for the contact portion 44a of the heat transfer suppressing member 44 to release heat directly received from the lining 14 to the extending portion 44b. The temperature rise of the contact portion 44a of the heat transfer suppressing member 44 can be suppressed. As a result, the temperature rise of the elastic member 40 in contact with the contact portion 44a can be more efficiently suppressed.

  In the present embodiment, only one heat transfer suppression member 44 is provided as a whole, and the number of steps for assembling the heat transfer suppression member 44 can be reduced. In addition, in the present embodiment, the adjacent linings 14 are arranged with a space between each other, and the extension part 44b of the heat transfer suppressing member 44 is also arranged between the linings 14, so that this extension part In 44b, the heat from the lining 14 can be shielded and released, and the temperature rise of the elastic member 40 can be more efficiently suppressed.

  In this embodiment, the elastic member 40 presses the lining 14, while the stepped portion 22 a of the through hole 22 formed in the lining 14 engages with the head 32 of the rivet 30, thereby preventing the lining 14 from coming off. Therefore, the substrate 12 and the lining 14 are securely coupled so that the elastic member 40 allows the displacement of the lining 14 and the elastic member 40 does not detach the lining 14 from the substrate 12. be able to.

  Further, in the present embodiment, when an overload is applied only to a specific lining 14 during a braking operation, the cylindrical portion 26 of the lining 14 and the curved seat 18 of the substrate 12 come into contact with each other. Can be prevented from being deformed up to the plastic deformation region, and the inclination of the lining 14 can be displaced according to the direction of the force applied to the lining 14.

  In the present embodiment, the bending stress generated in the rivet 30 can be reduced by providing the contact portion 34a of the rivet 30 on which the large shear stress and bending stress act in the vicinity of the substrate 12, thereby reducing the diameter of the rivet 30. Can be planned.

  Further, in the present embodiment, since the detent means for the lining 14 is provided, it is possible to avoid wear of the lining 14 and the heat transfer suppressing member 44 as the lining 14 rotates.

  In the present embodiment, the lining 14 includes the main body portion 24 and the cylindrical portion 26. Instead, the lining 14 is formed in a plate shape having a substantially constant thickness as shown in FIG. It is good also as the structure currently made. In this configuration, the substrate 12 is not provided with the curved seat 18, and the elastic member 40 is disposed between the substrate 12 and the lining 14 with the rivet 30 inserted directly into the opening 40 a. .

  The rivet 30 includes a head portion 32 for retaining and a columnar main body portion 34 provided integrally with the head portion 32. The main body 34 has an outer diameter smaller than that of the head 32.

  The contact portion 44 a of the heat transfer suppressing member 44 is formed in an annular shape having an inner diameter slightly larger than that of the main body portion 34 of the rivet 30 and having an outer diameter substantially the same as the upper end portion of the elastic member 40. ing. The rivet 30 is inserted directly into the contact portion 44a.

  The elastic member 40 is set to have an elastic coefficient so that the heat transfer suppressing member 44 and the substrate 12 do not come into contact with each other during a braking operation in which the lining 14 is pressed against the brake disk.

  When the pressing force is larger than the elastic force of the elastic member 40 during the braking operation, the elastic member 40 is elastically deformed. Due to the elastic deformation of the elastic member 40, the lining 14 moves in a direction approaching the substrate 12, or the lining 14 tilts. That is, when the lining 14 is not subjected to a uniform force over the entire surface due to the disk pad 10 being attached, the lining 14 being worn, etc., the lining 14 is inclined and the lining 14 is subjected to a uniform force over the entire surface. In this case, the lining 14 moves in parallel to the substrate 12 side while maintaining the posture. At this time, the pressing force of the lining 14 is borne by the elastic force of the elastic member 40.

  Also in this modified example, since it is difficult to raise the temperature of the elastic member 40, it is possible to easily suppress the temperature of the elastic member 40 from rising to a temperature at which it loses elasticity. In addition, since the lining 14 can be tilted and moved along the brake disk by the elastic member 40, a local increase in surface pressure can be reduced and the life of the lining 14 can be improved.

  In addition, in the said embodiment and modification, although comprised the heat-transfer suppression member 44 as an integral thing straddling each lining 14, it is good also as a structure which provides a separate heat-transfer suppression member for every lining 14 instead of this. .

It is a front view of the disk pad concerning the embodiment of the present invention. It is sectional drawing in the II-II line of FIG. It is a perspective view which shows an elastic member. FIG. 9 is a view corresponding to FIG. 2 showing a disk pad according to another embodiment. It is sectional drawing which shows the conventional disk pad.

Explanation of symbols

DESCRIPTION OF SYMBOLS 12 Board | substrate 14 Lining 18 Curved surface seat 22 Through hole 22a Step part 26 Cylindrical part 26a Tip surface 30 Rivet (an example of a holding member)
32 Head 34 Main body 34a Contact part 34b Intermediate part 40 Elastic member 44 Heat transfer suppressing member 44a Contact part 44b Extension part 48 Anti-rotation means

Claims (6)

A disk pad in which a lining is assembled to a substrate,
An elastic member that is disposed between the substrate and the lining, and that allows the lining to move in a direction approaching the substrate, while allowing the lining to be displaced by pressing against a brake disc;
A heat transfer suppression member disposed between the elastic member and the lining ;
The heat transfer suppressing member is provided with a contact portion that is pressed against the lining by the elastic member, and an extending portion that extends from the contact portion while being separated from the lining. . A plurality of the lining and the elastic member are provided,
The heat transfer suppressing member, the disc pad according to claim 1, characterized in that is provided so as to straddle the respective lining. The lining is provided with a through hole having a stepped portion,
A holding member having a head shaped to engage with the stepped portion is provided;
The lining is held in a state in which the stepped portion of the through hole comes into contact with the head of the holding member while being pressed away in a direction away from the substrate by the elastic force of the elastic member. The disk pad according to claim 1 or 2 , wherein A concave curved seat is formed on the substrate so as to surround a portion to which the holding member is fixed,
The lining is provided with a cylindrical portion having a convex tip surface disposed opposite to the curved seat.
4. The disk pad according to claim 3 , wherein the lining is held by the holding member with a gap between the cylindrical portion and the curved seat. The holding member includes a main body having a smaller diameter than the head,
The main body includes a contact portion that contacts the substrate, and an intermediate portion that is disposed between the contact portion and the head and has a smaller diameter than the contact portion.
4. a gap width between the cylindrical portion and the abutting portion of the holding member, characterized in that it is formed smaller than the gap width between the head and the lining of the holding member Disc pad as described in. The disk pad according to any one of claims 1 to 5 , wherein a detent means is provided to prevent the lining from rotating when pressed against the brake disk.

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