JP7302977B2 - Mounting structure of brake shoe for railway vehicle and brake shoe block - Google Patents

Description

TECHNICAL FIELD The present invention relates to a railroad vehicle brake shoe mounting structure and a brake shoe block.

Brake mechanisms for railway vehicles include a tread system that is often used for conventional railways. This tread system obtains braking force by pressing a brake shoe against the tread of the wheel.
The cast-iron brake shoe for railway vehicles of Patent Document 1 has a back plate (base metal) formed in an arc shape with a material having elasticity, and a plurality of cast-iron blocks are detachably provided with bolts and nuts. Therefore, for example, when the cast iron block wears, it is not necessary to replace the brake shoe itself, and only the cast iron block can be replaced and the back plate can be reused. Therefore, the cost for replacing the brake shoe can be reduced.
Further, the brake shoe mounting device of Patent Document 2 is a simple mechanism in which the slider is fitted to the slider holder to which the pin is connected in advance, the pin is rotated, and the free end of the pin is retained in the pin receiving recess. With such work, the slider can be attached to the slider holder.

JP-A-2008-002548 Japanese Utility Model Laid-Open No. 02-125221

However, the cast-iron brake shoe for railway vehicles of Patent Document 1 is specialized for cast iron as a friction material, and cannot be applied to sintered alloys or low-hardness resins. In addition, the fixing structure to the brake shoe head requires a back plate (base metal) as in the past, and does not improve the risk of vibration due to looseness. Further, since the brake shoe mounting device of Patent Document 2 has many thin plates and thin rod-like parts, there is a possibility that it may be damaged by impacts during transportation or flying objects (pebbles, etc.) during running. In addition, since the number of parts is large, maintainability is poor.

The present invention has been made in view of the above situation, and its purpose is to enable the combination of friction materials of different materials, and to reduce noise and wear of parts due to vibration by fixing them without backlash. To provide a brake shoe attachment structure and a brake shoe block for a railway vehicle, which can simplify the shape of parts and facilitate manufacturing, replacement and maintenance.

The above objects of the present invention are achieved by the following configurations.
(1) A brake shoe block in which a friction material is fixed to one surface of a reinforcing plate formed in the shape of a rectangular flat plate, and a brake shoe head in which a pair of said brake shoe blocks are arranged in tandem along the tread surface of the wheel. , positioning fixings provided at both ends of the brake shoe head in the wheel rotation direction to position and fix the adjacent expansion side edge and the opposite fixed side edge of the reinforcing plate of the pair of brake shoe blocks, respectively. and an expansion holding mechanism that is provided at an intermediate portion of the brake shoe head in the wheel rotation direction and holds the gap between the expansion side edges of the pair of the brake shoe blocks in a state of being pressed in a direction to expand, A mounting structure for a railroad vehicle brake shoe, comprising:

According to the railroad vehicle brake shoe mounting structure having the above configuration (1), the brake shoe block is directly fixed to the brake shoe head. In the brake shoe block, a friction material is fixed to one surface of a reinforcing plate made of a rectangular flat steel plate. By unifying the shape of the steel plate for the reinforcing plate, it is possible to combine friction materials with different properties. For example, the prior example of Patent Document 1 was specialized for friction materials with high hardness (cast iron is the base), but according to the mounting structure of the brake shoe for railway vehicles of this configuration, it can be used for materials with low hardness such as resin. Correspondence becomes possible easily. In addition, a set of brake blocks arranged in series on the brake shoe head along the tread of the wheel have an expansion holding mechanism provided in the middle part of the wheel rotation direction of the brake shoe head, and the space between the expanded side edges is is held in a state of being pressed in the direction of expansion. A pair of brake shoe blocks, the interval of which is expanded by the expansion holding mechanism, has fixed side edges fixed to respective positioning fixing portions at both ends of the wheel rotating direction of the brake shoe head. The extended retention mechanism is positioned between a pair of brake blocks so that the pair of brake blocks can be locked or released at the same time.

(2) A notch formed in one of the ends of the extension side edge, and a protruding portion corresponding to the notch on the brake shoe head, which is engaged with the notch to engage the brake. The attachment structure for a railroad vehicle brake shoe according to the above (1), further comprising: an incorrect assembly prevention protrusion that regulates the attachment direction of the wheel block.

According to the railroad vehicle brake shoe attachment structure having the above configuration (2), the notch is formed at either one end of the extension side edge. One of the ends of the extension side edge is one of the ends in the tread width direction. The tread width direction is a direction orthogonal to the circumferential direction of the tread of the wheel. A notch formed in one end engages an incorrect assembly prevention projection provided on the brake shoe head corresponding to the notch. That is, the brake shoe block is attached so that the inner and outer sides of the wheel in the tread width direction and the inner and outer sides of the friction material in the tread width direction are aligned with each other.

(3) The above (1), characterized by comprising a fixed side recess formed in the fixed side edge, and a fixed side protrusion provided in the positioning fixing part and fitted into the fixed side recess. Or the mounting structure of the railroad vehicle brake shoe according to (2).

According to the railroad vehicle brake shoe mounting structure having the above configuration (3), the fixed side concave portion is formed in the fixed side edge of the reinforcing plate. The fixed-side projection of the positioning fixing portion fits into the fixed-side concave portion. The fixed-side protrusions are formed in positioning fixing portions provided at both ends of the brake shoe head in the wheel rotation direction. The brake shoe block is restricted from moving in the tread width direction with respect to the brake shoe head by fitting the fixed-side concave portion of the reinforcing plate with the fixed-side protrusion of the positioning fixing portion. By restricting the movement of the wheel in the tread width direction, the brake shoe block is restricted from falling off in a temporarily assembled state before completion of fixing by the extension holding mechanism, thereby improving workability during fixing.

(4) The above, characterized in that it comprises an expansion-side recess formed in the expansion-side edge, and an expansion-side protrusion provided on the movable member of the expansion holding mechanism and fitted into the expansion-side recess. The mounting structure for a brake shoe for railway vehicles according to any one of (1) to (3).

According to the railroad vehicle brake shoe mounting structure having the above configuration (4), the expansion side recess is formed in the expansion side edge of the reinforcing plate. The extension-side protrusion of the movable member in the extension holding mechanism fits into the extension-side recess. The extension-side protrusion is formed on a movable member of an extension holding mechanism that is supported by the brake shoe head. The brake shoe block is restrained from moving in the tread width direction with respect to the brake shoe head by fitting the expansion-side concave portion of the reinforcing plate with the expansion-side protrusion of the movable member. By restricting the movement of the wheel in the tread width direction, the brake shoe block is restricted from falling off in a temporarily assembled state before completion of fixing by the extension holding mechanism, thereby improving workability during fixing.

(5) The extension holding mechanism has a forward threaded portion and a reverse threaded portion formed at both ends in the axial direction, and is provided so as to be movable along the wheel rotational direction and relatively rotatable with respect to the brake shoe head. The pair of brake shoes are configured to press in the direction of expanding the interval between the expansion side edges by being screwed into the both-end screw members and the normal screw portion and the reverse screw portion, respectively. and a pair of movable members interposed between the blocks.

According to the railroad vehicle brake shoe mounting structure having the above configuration (5), the expansion holding mechanism has a double-end screw member and a pair of movable members. The double-end threaded member has a normal threaded portion at one end and a reverse threaded portion at the other end. In the double-end threaded member, one movable member is screwed to the normal threaded portion, and the other movable member is screwed to the reverse threaded portion. The double-ended screw member is rotatably fixed to the brake shoe head in a direction along a vertical axis, for example, to increase the distance between the extended side edges. This extended retention mechanism may be referred to as an undersurface fixation. The extension holding mechanism fixed to the lower surface can simultaneously fix and release a set of brake blocks arranged vertically in series by rotating the double-ended screw members on the rear surface of the brake shoe head from below.

(6) The extension holding mechanism includes a threaded member having a threaded portion formed at one end in the axial direction, the threaded member being movably provided along the wheel rotation direction and rotatable relative to the brake shoe head; a first movable member screwed into the portion and engaged with one of the adjacent extension side edges; and a second movable member that is pressed against one end of the screw member.

According to the railroad vehicle brake shoe mounting structure having the above configuration (6), the expansion holding mechanism has the screw member, the first movable member, and the second movable member. A threaded portion is formed at one end of the threaded member. The first movable member is threaded onto the threaded portion of the threaded member and engages one of the adjacent expansion side edges. The second movable member is axially movably provided on the brake shoe head, engages with the other of the adjacent expansion side edges, and is pressed against one end of the screw member. The screw member is rotatably fixed to the brake shoe head in a direction along the vertical axis, for example, and expands the distance between the expansion side edges via the first movable member and the second movable member. This extended retention mechanism can also be referred to as undersurface fixation. The extension holding mechanism fixed to the lower surface can simultaneously fix and release a set of brake blocks arranged vertically by rotating the screw member on the rear surface of the brake shoe head from below.

(7) The railcar brake shoe mounting structure according to the above (6), wherein the second movable member is provided so as not to rotate about an axis with respect to the brake shoe head.

According to the railroad vehicle brake shoe mounting structure having the above configuration (7), the rotation of the second movable member about the shaft with respect to the brake shoe head is restricted. Therefore, the brake shoe block, whose extension side edge is engaged by the second movable member, is restricted from rotating around the axis of the second movable member, so that it can be temporarily assembled before the completion of fixing by the extension holding mechanism. The inclination with respect to the brake shoe head is regulated, and workability at the time of fixing is improved.

(8) The extension holding mechanism has a threaded portion formed at one end in the axial direction and a wedge cam integrally formed along the axial direction. a cam movable member provided movably along the wedge cam; sliding inclined surfaces respectively formed on the extended side edges so as to be in sliding contact with the pair of inclined surfaces of the wedge cam; and a rotating screw member that is screwed to move the cam movable member axially forward and backward with respect to the brake shoe head. A mounting structure for a railroad vehicle brake shoe.

According to the railway vehicle brake shoe mounting structure having the above configuration (8), the expansion holding mechanism includes a cam movable member, a sliding inclined surface formed on each of the expansion side edges, and a rotary screw member. have. The cam movable member has a threaded portion formed at one end in the axial direction and a wedge cam integrally formed at the other end in the axial direction. width direction). This wedge cam has a pair of inclined surfaces that approach and separate from each other in the tread width direction. That is, the pair of inclined surfaces are wedge-shaped. Sliding inclined surfaces are formed on the respective extension side edges and are in sliding contact with the pair of inclined surfaces of the wedge cam, respectively. The rotary screw member is screwed into the threaded portion of the wedge shaft, and moves the cam movable member back and forth in the tread width direction with respect to the brake shoe head to widen the interval between the expansion side edges. This extended retention mechanism can be referred to as a side fixation because it rotates a rotating screw member located on the side of the brake shoe head. The side-fixed expansion holding mechanism rotates the rotating screw member arranged on the side of the brake shoe head from the side of the brake shoe head, and simultaneously fixes and releases a set of brake shoe blocks arranged vertically in series. can.

(9) A set of brake shoe blocks having a friction material fixed to one surface of a reinforcing plate formed in the shape of a rectangular flat plate and arranged in tandem on the brake shoe head along the tread surface of the wheel, A concave portion is formed in at least one of the adjacent extension side edge of the reinforcing plate in the brake shoe block and the fixed side edge opposite to the extension side edge. and brake block.

According to the brake shoe block having the configuration (9) above, the concave portion is formed in at least one of the adjacent extension side edge of the reinforcing plate and the fixed side edge opposite to the extension side edge. It is formed. The recess is fitted with a brake shoe head or a projection of an extended retention mechanism. The brake shoe block restricts movement of the wheel in the tread width direction by fitting the concave portion of the reinforcing plate with the protrusion. By restricting the movement of the brake shoe block in the tread width direction, it is restricted from falling off in a temporarily assembled state before completion of fixing by the extension holding mechanism, and workability at the time of fixing is improved.

(10) The wheel-side sliding surface of the friction material in the brake shoe block is formed in a surface shape that matches the tread surface of the wheel, and is formed on both ends of the wheel flange-side side edge of the reinforcing plate in the brake shoe block. is formed with a notch that regulates the mounting direction of the brake block by engaging with an erroneous assembly prevention projection protruding from the brake shoe head. brake block.

According to the brake shoe block having the configuration (10) above, notches are formed at both ends of the wheel flange side edge of the reinforcing plate of the brake shoe block. The notch engages with an incorrect assembly prevention projection provided on the brake shoe head. The brake block is attached so that the inner and outer sides of the wheel in the tread width direction and the inner and outer sides of the friction material in the tread width direction are aligned with each other. As a result, the brake shoe block is prevented from being incorrectly assembled in such a manner that the pressure contact surface slope of the friction material is opposite to the tread slope of the wheel.

According to the mounting structure of the railroad vehicle brake shoe according to the present invention, it is possible to combine friction materials of different materials, and by fixing without rattling, noise due to vibration and wear of parts can be reduced. can be made into a simple shape, making manufacturing, replacement, and maintenance easy.

According to the brake shoe block of the present invention, it is possible to combine friction materials made of different materials, and to simplify the shape of the reinforcing plate and friction material, thereby facilitating manufacturing, replacement, and maintenance.

The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading the following detailed description of the invention (hereinafter referred to as "embodiment") with reference to the accompanying drawings. .

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a mounting structure of a railroad vehicle brake shoe according to a first embodiment of the present invention; 2 is a perspective view of the brake shoe block shown in FIG. 1; FIG. (a) is a rear view of the railroad vehicle brake shoe mounting structure shown in FIG. It is a bottom view of the mounting structure viewed from the lower end side of the brake shoe head. (a) is a sectional view taken along line AA of FIG. 3, and (b) is a sectional view taken along line BB of FIG. 4(a) and 4(b) are diagrams for explaining the operation during gap adjustment of the extension holding mechanism in the mounting structure according to the first embodiment of the present invention. FIG. Fig. 10 is a perspective view showing a mounting structure of a brake shoe for railway vehicles according to a second embodiment of the present invention; FIG. 7 is an exploded perspective view showing the attachment structure of the railway vehicle brake shoe shown in FIG. 6 ; (a) is a longitudinal sectional view showing a mounting structure according to a second embodiment of the present invention, and (b) is an exploded perspective view of the extension holding mechanism shown in (a). (a), (b), and (c) are diagrams for explaining the operation of the expansion holding mechanism during gap adjustment in the mounting structure according to the second embodiment of the present invention. (a) is a side view showing a railroad vehicle brake shoe mounting structure according to a third embodiment of the present invention, and (b) is a front view of (a) viewed from the friction material side. FIG. 11 is a perspective view of the cam movable member shown in FIG. 10; (a) and (b) are operation explanatory diagrams during gap adjustment of the expansion holding mechanism in the mounting structure according to the third embodiment. 12A and 12B are enlarged views of main parts corresponding to FIGS. 12A and 12B; FIG. (a) is a rear view of a railroad vehicle brake shoe mounting structure according to a reference example viewed from the brake shoe head side, (b) is a side view of the same mounting structure, and (c) is the same mounting structure from the friction material side It is the front view seen. (a) is a bottom view of the railroad vehicle brake shoe attachment structure shown in FIG. 14 as viewed from the lower end of the brake shoe head, and (b) is a cross-sectional view of the essential parts along the CC cross section of (a). . (a) is a perspective view of the brake shoe block shown in FIG. 14, (b) is a perspective view of the rotating screw member shown in FIG. 15, and (c) is a perspective view of the eccentric shaft shown in FIG. (a), (b), and (c) are diagrams for explaining the operation during clearance adjustment of the railroad vehicle brake shoe mounting structure according to the reference example.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
[First embodiment]
FIG. 1 is a perspective view showing a mounting structure of a railroad vehicle brake shoe according to a first embodiment of the present invention.
As shown in FIG. 1, the railroad vehicle brake shoe mounting structure according to the present embodiment mainly includes a brake shoe block 11, a brake shoe head 13, a positioning fixing portion 15, and an extension holding mechanism 17. have as

FIG. 2 is a perspective view of the brake shoe block 11 shown in FIG.
As shown in FIG. 2, the brake shoe block 11 has a reinforcing plate 19 formed in the shape of a rectangular flat plate, and a friction material 21 is fixed to one surface of the reinforcing plate 19 . The wheel-side sliding surface (pressure contact surface) of the friction material 21 is formed in a surface shape that matches the tread surface 25 (see FIG. 4) of the wheel 23 . The reinforcing plate 19 is formed of a simple rectangular flat plate made of steel plate. The friction material 21 can be made of sintered alloy or resin. In the conventional railroad vehicle brake shoe, a base metal was required to fix the brake shoe block to the brake shoe head. (that is, the reinforcing plate 19) is fixed.

A set of the brake shoe blocks 11 is arranged in tandem on the brake shoe head 13 along the tread 25 (see FIG. 4) of the wheel 23 . A concave portion is formed in at least one of the extension side edge 27 adjacent to the reinforcing plate 19 in the pair of brake shoe blocks 11 and the fixed side edge 29 opposite to the extension side edge 27. be done. In the first embodiment, recesses are formed in both the extension side edge 27 and the fixed side edge 29 as extension side recesses 33 and fixed side recesses 31 .

That is, the fixed side recess 31 is formed in the fixed side edge 29 of the reinforcing plate 19 . Further, an expansion-side concave portion 33 is formed in the expansion-side edge 27 of the reinforcing plate 19 . The fixed-side concave portion 31 is fitted to a fixed-side protrusion 47 of the positioning fixing portion 15, which will be described later. The extension-side concave portion 33 is fitted with an extension-side protrusion 59 of a movable member (a positive screw movable member 61 and a reverse screw movable member 63) provided in the expansion holding mechanism 17, which will be described later.

The railroad vehicle brake shoe attachment structure according to the first embodiment has a notch 35 in the reinforcing plate 19 and an incorrect assembly prevention projection 37 (see FIG. 3) of the brake shoe head 13 . The notch 35 is formed at one of the ends of the extension-side edge 27 (in the first embodiment, the end on the wheel flange side in the tread width direction). The erroneous assembly prevention projection 37 is provided on the brake shoe head 13 so as to correspond to the notch 35 . The erroneous assembly prevention protrusion 37 regulates the mounting direction of the brake shoe block 11 by engaging with the notch 35 .

FIG. 3(a) is a rear view of the railroad vehicle brake shoe attachment structure shown in FIG. 1, viewed from the brake shoe head 13 side, and FIG. FIG. 3(c) is a front view and a bottom view of the mounting structure viewed from the lower end side of the brake shoe head 13. FIG.

The brake shoe head 13 holds a set of brake shoe blocks 11, as shown in FIGS. That is, on the brake shoe head 13, a set of brake shoe blocks 11 are arranged in tandem along the tread 25 of the wheel 23. As shown in FIG. The brake shoe head 13 has a mounting surface 39 (see FIG. 4) for mounting the brake shoe block 11, which is formed in a plane parallel to the reinforcing plate 19. As shown in FIG. A pair of parallel side plate portions 43 are integrally formed on the rear surface of the mounting plate 41 on which the mounting surface 39 is formed, extending in the circumferential direction of the tread surface 25 and spaced apart in the direction along the axle. The brake shoe head 13 is pivotably attached to a non-rotating member (for example, a live lever) supported by a bogie frame of a railroad vehicle, using a mounting hole 45 drilled in the side plate portion 43. be done.

4(a) is a cross-sectional view taken along the line AA of FIG. 3, and FIG. 4(b) is a cross-sectional view taken along the line BB of FIG.
As shown in FIGS. 3 and 4, the brake shoe head 13 has positioning fixing portions 15 at both ends in the wheel rotation direction. The positioning fixing portion 15 has a gap parallel to the mounting surface 39 into which the fixing side edge 29 is inserted. Each of the positioning fixing portions 15 positions and fixes the adjacent extending side edge 27 and the opposite fixed side edge 29 of the reinforcing plate 19 in the pair of brake shoe blocks 11 .

A fixed-side protrusion 47 is provided on the positioning fixing portion 15 of the brake shoe head 13 . The fixed-side protrusion 47 is positioned in the gap of the positioning fixing portion 15 and fits into the fixed-side concave portion 31 of the reinforcing plate 19 . That is, the brake shoe block 11 is constructed so that the pair of fixed side edges 29 facing each other with the fixed side recess 31 therebetween can be inserted into a pair of gaps with the fixed side projection 47 therebetween.

An extension holding mechanism 17 is provided at an intermediate portion of the brake shoe head 13 in the wheel rotation direction. The expansion holding mechanism 17 holds the gap between the expansion side edges 27 of the pair of brake shoe blocks 11 in a state of being pressed in the direction of expansion.

In the first embodiment, the extension holding mechanism 17 has a double-ended screw member 49 and a pair of movable members.
The double-end threaded member 49 has a normal threaded portion 51 and a reverse threaded portion 53 at both ends in the axial direction. The double-end screw member 49 is provided movably and relatively rotatably with respect to the brake shoe head 13 along the wheel rotation direction (more precisely, the vertical direction parallel to the tangential line of the wheel 23). The double-end screw member 49 is rotatably fixed to the brake shoe head 13 by a shaft stop plate 55 . A hexagonal wrench hole 57 is formed in one end face of the double-end screw member 49 . The double-end screw member 49 is rotatably attached to the brake shoe head 13 with the hex wrench hole 57 facing downward.

A set of movable members are interposed between a set of brake shoe blocks 11 . A pair of movable members are configured to press in a direction to expand the interval between the expansion side edges by being screwed into the forward threaded portion 51 and the reverse threaded portion 53 respectively.
Each of the pair of movable members is provided with an extension side protrusion 59 . The extension-side protrusion 59 is fitted into the extension-side recess 33 of the reinforcing plate 19 described above in the same manner as the fixed-side protrusion 47 is.

One of the pair of movable members is a normal threaded movable member 61 having a normal threaded portion 51 and the other is formed with a reverse threaded portion 53 so that it can be screwed onto both ends of the double-ended threaded member 49. It becomes the reverse screw movable member 63 .

FIGS. 5(a) and 5(b) are explanatory diagrams of the operation of the expansion holding mechanism 17 in the mounting structure according to the first embodiment of the present invention when adjusting the gap.
A pair of brake shoe blocks 11 have fixed side edges 29 engaged with the positioning and fixing portions 15 of the brake shoe head 13, and as shown in FIG. 27 are engaged with the positive screw movable member 61 and the reverse screw movable member 63 for temporary assembly. In this temporarily assembled state, the brake shoe block 11 does not come off, but there is a gap between the movable member and the extension side edge 27 .

When a hexagonal wrench is inserted into the hexagonal wrench hole 57 and the both-ends screw member 49 is rotated, the positive screw movable member 61 and the reverse screw movable member 63 are moved in a direction separating them. Then, the lower right-hand screw movable member 61 hits the extended side edge 27 of the lower brake shoe block 11 .
When the screw member 49 on both ends is further rotated, the upper reverse screw movable member 63 is pushed up by the gap generated between it and the upper brake shoe block 11 . At this time, the position of the positive screw movable member 61 below remains unchanged. By rotating the double-end screw member 49 until it stops moving, the fixing of the pair of brake shoe blocks 11 is completed.

Next, the operation of the railroad vehicle brake shoe mounting structure according to the first embodiment will be described.
In the railroad vehicle brake shoe mounting structure according to the first embodiment, the brake shoe block 11 is directly fixed to the brake shoe head 13 . In the brake shoe block 11, a friction material 21 is fixed to one surface of a reinforcing plate 19 made of a rectangular flat steel plate. By unifying the shape of the steel plate of the reinforcing plate 19, it is possible to combine the friction materials 21 with different properties. For example, the prior example of Patent Document 1 was specialized for a friction material with high hardness (cast iron is the base), but in the mounting structure of the railroad vehicle brake shoe of the first embodiment, a material with low hardness such as resin is used. can be easily dealt with.

A set of brake blocks 11 arranged in tandem on the brake head 13 along the tread 25 of the wheel 23 are extended by an expansion holding mechanism 17 provided at the intermediate portion of the brake head 13 in the wheel rotation direction. The side edges 27 are held in a state of being pressed in a direction to widen the distance between the side edges 27 . A pair of brake shoe blocks 11 whose spacing is expanded by the expansion holding mechanism 17 has fixed side edges 29 fixed to respective positioning fixing portions 15 at both ends of the wheel rotating direction of the brake shoe head 13 . The extended holding mechanism 17 is arranged between a pair of brake shoe blocks 11, so that the pair of brake shoe blocks 11 can be fixed or released at the same time.

For pressing the extension holding mechanism 17, for example, a simple screw tightening mechanism or a shaft rotation mechanism can be employed. Thus, in the railway vehicle brake shoe mounting structure according to the first embodiment, it is possible to simultaneously complete the fixing of a set of brake shoe blocks 11 by simple operations such as rotating the shaft and tightening the screws. can. In addition, it is possible to cope with the change of the fixing position due to the dimensional variation, and the fixing can be performed without rattling. A set of brake shoe blocks 11 can be simultaneously opened and removed by a simple operation such as rotating the shaft or loosening the screws.

In addition, in the railroad vehicle brake shoe mounting structure according to the first embodiment, the notch 35 is located at one end of the extension side edge 27 (in the first embodiment, the wheel flange in the tread width direction). side edge). One of the ends of the extension-side edge 27 is one of the ends in the tread width direction. The tread width direction is a direction orthogonal to the circumferential direction of the tread 25 of the wheel 23 . A notch 35 formed in one end (an end on the wheel flange side in the tread width direction) is engaged with an incorrect assembly prevention projection 37 provided on the brake shoe head 13 corresponding to the notch 35 . match. That is, the brake shoe block 11 is attached so that the inner and outer sides of the wheel 23 in the tread width direction and the inner and outer sides of the friction material 21 in the tread width direction are aligned.

The treads 25 of the wheels 23 are provided with tread slopes for steering the wheelset in curves. This tread slope is a sloped surface that slopes in the vertical direction from one side of the rail to the other side in the cross section of the rail. In the brake shoe block 11, the pressure contact surface slope of the friction material 21 also follows this tread slope.

In the mounting structure of the railroad vehicle brake shoe according to the first embodiment, the mounting direction of the friction material 21 in the tread width direction is set to the inner and outer sides in the tread width direction by the erroneous assembly prevention projection 37 of the brake shoe block 11. Therefore, it is possible to prevent erroneous assembly in which the slope of the pressure contact surface is opposite to the slope of the tread.

In addition, in the railroad vehicle brake shoe mounting structure according to the first embodiment, the fixed side concave portion 31 is formed in the fixed side edge 29 of the reinforcing plate 19 . The fixed-side protrusion 47 of the positioning fixing portion 15 is fitted into the fixed-side concave portion 31 . The fixed-side projections 47 are formed in the positioning fixing portions 15 provided at both ends of the brake shoe head 13 in the wheel rotation direction. The brake shoe block 11 is restricted from moving in the tread width direction with respect to the brake shoe head 13 by fitting the fixed side concave portion 31 of the reinforcing plate 19 with the fixed side protrusion 47 of the positioning fixing portion 15 . By restricting the movement of the wheel 23 in the tread width direction, the brake shoe block 11 is restricted from falling off in a temporarily assembled state before completion of fixing by the expansion holding mechanism 17, and workability during fixing is improved.

In addition, in the railroad vehicle brake shoe mounting structure according to the first embodiment, the expansion side recessed portion 33 is formed in the expansion side edge 27 of the reinforcing plate 19 . The extension-side protrusion 59 of the movable member (the positive screw movable member 61 and the reverse screw movable member 63 ) in the expansion holding mechanism 17 is fitted into the expansion-side concave portion 33 . The expansion-side protrusion 59 is formed on a movable member of the expansion holding mechanism 17 supported by the brake shoe head 13 . The brake shoe block 11 has a tread width for the brake shoe head 13 by fitting the expansion side concave portion 33 of the reinforcing plate 19 with the expansion side protrusion 59 of the movable member (forward screw movable member 61 and reverse screw movable member 63). Directional movement is restricted. By restricting the movement of the wheel 23 in the tread width direction, the brake shoe block 11 is restricted from falling off in a temporarily assembled state before completion of fixing by the expansion holding mechanism 17, and workability during fixing is improved.

The brake shoe block 11 provided with both the fixed side recess 31 and the expansion side recess 33 has both ends in the wheel rotation direction fitted into the fixed side protrusion 47 and the expansion side protrusion 59 to provide a tread width. Directional movement is more reliably regulated. The tread surface 25 of the wheel 23 is provided with the tread slope. The left and right wheels 23 have flanges formed on the inside when viewed from the front, and have tread gradients that are higher on the inside and lower on the outside. When the left and right wheels 23 travel on a curve, the wheel shafts are directed outward due to centrifugal force. As a result, the portion of the wheel 23 on the outer peripheral side having a larger diameter rides on the rail. On the other hand, the wheels 23 on the inner peripheral side, on the contrary, ride on the rail at the smaller diameter portion. As a result, the outer peripheral side travels a greater distance, and the differential between the left and right wheels 23 becomes possible. In the railroad vehicle brake shoe mounting structure according to the first embodiment, by reliably restricting the movement of the brake shoe block 11 in the tread width direction, uneven wear (tread It is possible to suppress the occurrence of wear that impairs the slope.

Further, in the railroad vehicle brake shoe mounting structure according to the first embodiment, the expansion holding mechanism 17 includes the both-ends screw member 49 and a set of positive screw movable member 61 and reverse screw movable member 63, which are a pair of movable members. , have The both-end threaded member 49 has a normal threaded portion 51 at one end and a reverse threaded portion 53 at the other end. In the double-end threaded member 49, a positive screw movable member 61, which is one of the movable members, is screwed to the positive screw portion 51, and a reverse screw movable member 63, which is the other movable member, is screwed to the reverse screw portion 53. As shown in FIG. 4(a), the double-end screw member 49 is rotatably fixed to the brake shoe head 13 in the direction along the vertical axis to expand the interval between the expansion side edges 27. As shown in FIG. This extended retention mechanism 17 can be referred to as a lower surface fixation. The expansion holding mechanism 17 fixed on the lower surface can simultaneously fix and release a set of brake blocks 11 vertically arranged in series by rotating the double-end screw member 49 on the rear surface of the brake shoe head from below.

In the expansion holding mechanism 17 according to the first embodiment, the movement distance until fixation differs between the upper and lower positive screw movable member 61 and the reverse screw movable member 63 due to the difference in component dimensions. In order to solve this problem, the fixing portion of the double-end screw member 49 by the shaft stop plate 55 is movable in the vertical direction by a very small distance. First, from the position where the positive screw movable member 61 or the reverse screw movable member 63 contacts the brake shoe block 11 as a base point, the distance between the upper and lower positive screw movable members 61 and the reverse screw movable members 63 is increased while the both ends are screwed. Since the member 49 also moves, the intermediate point of the distance required for fixing coincides with the central portion of the screw member 49 on both ends, and the fixing can be performed without a gap in the vertical direction.

At that time, in the railroad vehicle brake shoe mounting structure according to the first embodiment, the angle difference between the moving direction of the positive screw movable member 61 and the reverse screw movable member 63 and the fastening direction of the brake block 11 is used to fix the brake shoe. It is constructed so that a load is also generated in the direction in which the brake shoe block 11 is pressed against the brake shoe head 13 at times.

The expansion holding mechanism 17 according to the first embodiment has a positive screw portion 51 and a reverse screw portion 53 at both ends of a double-ended screw member 49, and a positive screw movable member 61 and a The integrated extension holding mechanism 17 is fixed to the lower surface by screwing the reverse screw movable members 63 together. The integrated expansion holding mechanism 17 accurately transmits the rotational force of the double-end screw member 49 to the positive screw movable member 61 and the reverse screw movable member 63, so that the fixation accuracy is high. In addition, since the forward threaded portion 51 and the reverse threaded portion 53 each have rotational resistance, they are also effective in preventing loosening.

Assembly defects are often caused by the number and complexity of processes. The expansion holding mechanism 17 according to the first embodiment can be fixed only by rotating the double-end screw member 49, and the fixing is completed when the rotation stops, so the determination is easy. In addition, since the mechanism continues to rotate until the rattling is completely eliminated, there is no gap between the brake shoe head 13 and the conventional brake shoe, which eliminates wear and noise due to vibration and improves durability against impact. .

A gap between the brake shoe head 13 and the wheel 23 is only as high as the brake shoe block 11.例文帳に追加Therefore, the mounting structure of the railroad vehicle brake shoe according to the first embodiment is configured so as to be capable of being attached and detached from the side like the conventional brake shoe. In addition, since the railroad vehicle brake shoe attachment structure according to the first embodiment has a small number of parts and a large part size, manufacturing, parts replacement, and maintenance are easy, and each part has high strength. This also has the effect of making it possible to deal with rust and damage to the brake shoe head 13, the brake shoe block 11 and the extended holding mechanism 17 because the area around the brake shoe is close to the ground and is always exposed to wind and snow.

In the brake shoe block 11 according to the first embodiment, both the extension side edge 27 adjacent to the reinforcing plate 19 and the fixed side edge 29 opposite to the extension side edge 27 are provided with the extension side A recessed portion 33 and a fixed side recessed portion 31 are formed respectively. The fixed-side protrusion 47 of the brake shoe head 13 is fitted into the fixed-side recess 31, and the expansion-side protrusions of the forward screw movable member 61 and the reverse screw movable member 63 of the extension holding mechanism 17 are fitted into the extension-side recess 33. 59 fits. The brake shoe block 11 moves in the width direction of the tread surface by fitting the recessed portions (the extended side recessed portion 33 and the fixed side recessed portion 31) of the reinforcing plate 19 with the projections (the extended side projected portion 59 and the fixed side projected portion 47). is regulated. By restricting the movement of the brake shoe block 11 in the tread width direction, it is restricted from falling off in a temporarily assembled state before completion of fixing by the expansion holding mechanism 17, and workability at the time of fixing is improved.

The brake shoe block 11 according to the first embodiment, in which recesses are provided on both the extension side edge 27 and the fixed side edge 29 on the opposite side, has fixed side protrusions 47 at both ends in the wheel rotation direction. and the extension-side projection 59 to reliably restrict movement in the width direction of the tread surface. As a result, the brake shoe block 11 can suppress uneven wear on the tread 25 of the wheel 23 having a tread slope, as described above.

Further, in the brake shoe block 11 according to the first embodiment, notches 35 are formed at both ends of the wheel flange side edge of the reinforcing plate 19 of the brake shoe block 11 . The notch 35 engages with an incorrect assembly prevention projection 37 projecting from the brake shoe head 13 . The brake shoe block 11 is attached so that the inner and outer sides of the wheel 23 in the tread width direction and the inner and outer sides of the friction material 21 in the tread width direction are aligned with each other. As a result, the brake shoe block 11 is prevented from being incorrectly assembled in such a manner that the pressure contact surface gradient of the friction material 21 is opposite to the tread surface gradient of the wheel 23, as described above.

[Second embodiment]
Next, a second embodiment of the invention will be described.
FIG. 6 is a perspective view showing a railroad vehicle brake shoe mounting structure according to a second embodiment of the present invention, and FIG. 7 is an exploded perspective view showing the railroad vehicle brake shoe mounting structure shown in FIG. . In addition, in the second embodiment, the same members and parts as those according to the first embodiment shown in FIGS. 1 to 5 are denoted by the same reference numerals, and redundant explanations are omitted.
The railroad vehicle brake shoe mounting structure according to the second embodiment differs from the railroad vehicle brake shoe mounting structure according to the first embodiment in a part of the brake shoe head 13 and the extension holding mechanism 65 .

As shown in FIGS. 6 and 7, the brake shoe head 13 has a pair of side plate portions 43 whose center portions are connected to each other by a pair of connection wall portions 67 spaced apart in the wheel rotation direction. A rectangular hole 69 is formed in one connecting wall portion 67 . A circular hole 71 is formed in the other connecting wall portion 67 . The extension holding mechanism 65 is attached between the pair of connecting wall portions 67 .

The extension holding mechanism 65 according to the second embodiment has a screw member 73 , a first movable member 75 and a second movable member 77 .
The threaded member 73 has a threaded portion 79 (see FIG. 8) formed at one axial end thereof. The screw member 73 has a hexagonal wrench hole 57 formed at the other end in the axial direction. The other end of the screw member 73 is inserted through the round hole 71 of the other connecting wall portion 67, and is provided movably along the wheel rotation direction and rotatable relative to the brake shoe head 13. As shown in FIG.

FIG. 8(a) is a longitudinal sectional view showing the mounting structure according to the second embodiment of the present invention, and FIG. 8(b) is an exploded perspective view of the expansion holding mechanism 65 shown in FIG. 8(a). .
The first movable member 75 is formed in the shape of a rectangular block, and a female thread 81 with which the threaded portion 79 of the threaded member 73 is screwed is formed on one side in the longitudinal direction. The first movable member 75 is formed with an extension-side protrusion 59 on the other side in the longitudinal direction. The expansion-side protrusion 59 of the first movable member 75 engages with the expansion-side recess 33 provided in the expansion-side edge 27 of the adjacent brake shoe block 11 .

The second movable member 77 has an angular shaft portion 83 . The square shaft portion 83 is formed with an expansion side protrusion 59 on one end side. The expansion-side protrusion 59 of the second movable member 77 engages with the expansion-side recess 33 provided in the expansion-side edge 27 of the adjacent brake shoe block 11 . The second movable member 77 is axially movable relative to the brake shoe head 13 and axially movable relative to the brake shoe head 13 by inserting the square shaft portion 83 into the square hole 69 of one of the connecting wall portions 67 . is non-rotatably provided in the The second movable member 77 is pressed against one end of the screw member 73 as the screw member 73 is rotated.

9(a), (b), and (c) are explanatory diagrams of the operation of the expansion holding mechanism 65 in the mounting structure according to the second embodiment of the present invention when adjusting the gap.
As shown in FIG. 8(a), a pair of brake shoe blocks 11 arranged in a vertical line have fixed side edges 29 engaged with the positioning and fixing portions 15 of the brake shoe head 13, As shown in (a) of FIG. 9, the extension side edges 27 are engaged with the first movable member 75 and the second movable member 77 for provisional assembly. In this temporarily assembled state, the brake shoe block 11 does not come off, but there is a gap between the one end of the screw member 73 and the second movable member 77 .

When a hexagonal wrench is inserted into the hexagonal wrench hole 57 and the screw member 73 is rotated, one end of the screw member 73 pushes up the upper second movable member 77 . As a result, as shown in FIG. 9B, the second movable member 77 hits the upper brake shoe block 11 first. At this time, although the gap between the first movable member 75 on the lower side and the brake shoe block 11 is large, the brake shoe block 11 can be prevented from falling down simply by lightly supporting it with the hand.

As the screw member 73 is further rotated, the lower first movable member 75 descends and hits the extended side edge 27 of the lower brake shoe block 11 . At this time, the position of the upper second movable member 77 remains unchanged. By rotating the screw member 73 until it stops moving, fixing of the set of brake shoe blocks 11 is completed.

Next, the operation of the railroad vehicle brake shoe mounting structure according to the second embodiment will be described.
In the railroad vehicle brake shoe attachment structure according to the second embodiment, the expansion holding mechanism 65 has a screw member 73 , a first movable member 75 , and a second movable member 77 . A threaded portion 79 is formed at one end of the threaded member 73 . The first movable member 75 is threaded onto the threaded portion 79 of the threaded member 73 and engages the extended edge 27 of the adjacent lower brake block 11 . The second movable member 77 is provided axially movably on the brake shoe head 13, engages with the extension side edge 27 of the adjacent upper brake shoe block 11, and is pressed against one end of the screw member 73. . As shown in FIG. 8(a), the screw member 73 is rotatably fixed to the brake shoe head 13 in the direction along the vertical axis (up and down direction), and moves through a first movable member 75 and a second movable member 77. to expand the interval between the expansion side edges 27. As shown in FIG. This extended holding mechanism 65 can also be referred to as lower surface fixation. The extension holding mechanism 65 fixed on the bottom surface rotates the screw member 73 on the rear surface of the brake shoe head from below, and can simultaneously fix and release a set of the brake shoe blocks 11 vertically arranged in series.

Further, according to the railroad vehicle brake shoe mounting structure according to the second embodiment, the square shaft portion 83 of the second movable member 77 is inserted into the square hole 69 of one of the connecting wall portions 67, It is provided so as not to be rotatable around the axis with respect to the brake shoe head 13 . Therefore, the rotation of the second movable member 77 about the axis with respect to the brake shoe head 13 is restricted. Therefore, the brake shoe block 11, to which the expansion side edge 27 is engaged by the second movable member 77, is restricted from rotating about the axis of the second movable member 77, so that it is The inclination with respect to the brake shoe head 13 in the temporarily assembled state is regulated, and workability at the time of fixing is improved.

In the extension holding mechanism 65 according to the second embodiment, the first movable member 75 is screwed to the threaded member 73, and the second movable member 77, which is separate from the threaded member 73, is attached to one end of the threaded member 73. A separate extension holding mechanism 65 with a fixed lower surface for pressing is provided. The separate extension holding mechanism 65 can detach and attach these members from between the pair of side plate portions 43 when exchanging the screw member 73, the first movable member 75, and the second movable member 77. FIG. Therefore, the separate extension holding mechanism 65 according to the second embodiment does not need to disassemble the brake shoe head 13 at the time of replacement, etc., and is excellent in maintainability. Further, since the shape of each component can be simplified, the cost can be reduced and the strength can be increased as compared with the integrated extension holding mechanism 17 according to the first embodiment. Other actions are the same as those of the integrated extension holding mechanism 17 according to the first embodiment.

[Third embodiment]
Next, a third embodiment of the invention will be described.
FIG. 10(a) is a side view showing a railroad vehicle brake shoe mounting structure according to a third embodiment of the present invention, and FIG. 10(b) is a view of FIG. 10(a) from the friction material 21 side. It is a front view. 11 is a perspective view of the cam movable member 91 shown in FIG. 10. FIG. In the third embodiment, the same members and parts as those according to the first embodiment shown in FIGS. 1 to 5 are denoted by the same reference numerals, and redundant explanations are omitted.
The railroad vehicle brake shoe mounting structure according to the third embodiment differs from the railroad vehicle brake shoe mounting structure according to the first embodiment in a part of the brake shoe head 13 and the extension holding mechanism 85 .

As shown in FIG. 10, the brake shoe head 13 has a thick bearing portion 87 (see FIG. 12) extending in the direction along the axle in the central portion of the mounting plate 41 and extending across the pair of side plate portions 43. It is formed. The bearing portion 87 is formed with a bearing hole 89 having a C-shaped cross section and an open surface facing the tread surface 25 so as to penetrate in the direction along the axle. The extension holding mechanism 85 is attached to the brake shoe head 13 through this bearing hole 89 .

The expansion holding mechanism 85 according to the third embodiment has a cam movable member 91 , a sliding inclined surface 93 and a rotary screw member 95 .
The cam movable member 91 has a threaded portion 79 formed at one axial end of a wedge shaft 97 . A wedge cam 99 is integrally formed along the axial direction at the other axial end of the wedge shaft 97 . A wedge shaft 97 of the cam movable member 91 is inserted into the bearing hole 89 of the brake shoe head 13 . The cam movable member 91 with the wedge shaft 97 inserted into the bearing hole 89 is movable with respect to the brake shoe head 13 along the direction intersecting the wheel rotation direction. Also, the cam movable member 91 is attached to the bearing hole 89 so as to be freely swingable (freely swingable) about the axis of the wedge shaft 97 .

A sliding inclined surface 93 (see FIG. 12) is formed on each extension side edge 27 of the pair of brake shoe blocks 11A. A pair of sliding inclined surfaces 93 formed on each extension side edge 27 faces and slides on a pair of inclined surfaces 101 of the wedge cam 99 respectively. On the front side of each slanted surface 101, a brake shoe block fall-off prevention collar 103 is formed.

The rotary screw member 95 is formed in a cylindrical shape with the female screw 81 coaxially provided. A diametric jig engagement groove 105 (see FIG. 10) may be formed in the end face of the rotary screw member 95 on the non-threaded side. In this case, a large jig engaging groove 105 is provided so that it can be rotated with a simple jig.
The rotary screw member 95 is screwed onto the threaded portion 79 of the wedge shaft 97 . A threaded portion 79 of the wedge shaft 97 protrudes from a bearing hole 89 that opens on the side surface of the bearing portion 87 . The rotary screw member 95 is screwed onto the screw portion 79 projecting from the bearing portion 87 . As a result, the cam movable member 91 can move back and forth along the axle with respect to the brake shoe head 13 by rotating the rotary screw member 95 .

FIGS. 12(a) and 12(b) are explanatory diagrams of the operation during gap adjustment of the extension holding mechanism in the mounting structure according to the third embodiment of the present invention.
As shown in FIG. 10, a pair of brake shoe blocks 11A arranged in a vertical line have fixed side edges 29 engaged with the positioning and fixing portions 15 of the brake shoe head 13, and ( As shown in a), each expansion side edge 27 is engaged with the wedge cam 99 of the cam movable member 91 to be temporarily assembled. In this temporarily assembled state, the brake shoe block 11A does not come off, but there is a gap between the inclined surface 101 of the wedge cam 99 and the extension side edge 27. As shown in FIG.

FIGS. 13(a) and 13(b) are enlarged views of essential parts corresponding to FIGS. 12(a) and 12(b).
When the rotary screw member 95 is rotated, the cam movable member 91 is moved, and the lower inclined surface 101 of the wedge cam 99 hits the sliding inclined surface 93 of the lower brake shoe block 11A first.

The rotary screw member 95 rotates until the upper and lower inclined surfaces 101 of the wedge cam 99 evenly contact the sliding inclined surfaces 93, as shown in FIG. 13(b). By rotating the wedge shaft 97 until it stops moving, the set of brake shoe blocks 11A is fixed.

Next, the operation of the railroad vehicle brake shoe mounting structure according to the third embodiment will be described.
In the railroad vehicle brake shoe mounting structure according to the third embodiment, the expansion holding mechanism 85 includes a cam movable member 91, a sliding inclined surface 93 formed on each of the expansion side edges 27, and a rotary screw member 95 and The cam movable member 91 has a threaded portion 79 formed at one axial end of a wedge shaft 97 and a wedge cam 99 integrally formed at the other axial end of the wedge shaft 97 . It is provided so as to be movable in a direction intersecting the wheel rotation direction (the tread width direction of the wheel 23). The wedge cam 99 has a pair of inclined surfaces 101 that approach and separate from each other in the tread width direction. That is, the pair of inclined surfaces 101 are wedge-shaped.

The sliding inclined surfaces 93 are formed on the respective extension side edges 27 and are in sliding contact with the pair of inclined surfaces 101 of the wedge cam 99 respectively. The rotary screw member 95 is screwed onto the threaded portion 79 of the wedge shaft 97 to move the cam movable member 91 forward and backward relative to the brake shoe head 13 in the width direction of the tread surface, thereby widening the interval between the extended side edges 27 . The expansion holding mechanism 85 according to the third embodiment can be called side fixation because it rotates the rotating screw member 95 arranged on the side surface of the brake shoe head 13 . The side-fixed expansion holding mechanism 85 rotates the rotating screw member 95 arranged on the side surface of the brake shoe head 13 from the side surface of the brake shoe head 13, and simultaneously fixes a set of the brake shoe blocks 11A arranged vertically in series.・Can be opened.

Also in the expansion holding mechanism 85 according to the third embodiment, the moving distance of the pair of inclined surfaces 101 until fixing differs between the upper and lower sides due to the difference in component dimensions. In order to solve this problem, the wedge shaft 97 of the cam movable member 91 is inserted into the bearing hole 89 of the brake shoe head 13 to swing its neck vertically. When the wedge shaft 97 contacts one brake block 11A first, the wedge shaft 97 rotates in the opposite direction (swings about the axis of the wedge shaft 97) and contacts the other brake block 11A. The cam movable member 91 rotates until the pair of inclined surfaces 101 of the wedge cam 99 evenly contact the upper and lower brake shoe blocks 11A. The cam movable member 91 continues to rotate the rotary screw member 95 until the wedge shaft 97 does not move. As a result, in the railroad vehicle brake shoe mounting structure according to the third embodiment, the gap between the pair of brake shoe blocks 11A arranged vertically in series and the wedge cam 99 is formed at a position where the rotating screw member 95 is prevented from rotating. is filled evenly and fixation is completed.

[Reference example]
Next, a reference example will be described.
FIG. 14(a) is a rear view of the railroad vehicle brake shoe mounting structure according to the reference example viewed from the brake shoe head 13 side, FIG. 14(b) is a side view of the same mounting structure, and FIG. ) is a front view of the same mounting structure as seen from the friction material side. FIG. 15(a) is a bottom view of the railroad vehicle brake shoe mounting structure shown in FIG. 14 as viewed from the lower end side of the brake shoe head 13, and FIG. FIG. 4 is a cross-sectional view of a main part taken along the C cross section; In the reference example, members and parts that are the same as those in the first embodiment shown in FIGS. 1 to 5 are denoted by the same reference numerals, and overlapping descriptions are omitted.
The railroad vehicle brake shoe mounting structure according to this reference example rotates an eccentric shaft 107 provided on the rear surface of the brake shoe head 13 to separately fix and release a set of brake shoe blocks 11B arranged vertically in series. do.

As shown in FIGS. 14 and 15, eccentric shafts 107 having threaded portions 179 pass through both ends of the brake shoe head 13 according to this reference example from the front side. A rotating screw member 111 having a female screw portion 109 is screwed to the tip of an eccentric shaft 107 penetrating through the rear surface of the brake shoe head 13 . A pair of jig holes 113 are formed in the rear surface of the rotary screw member 111 . A compression spring is coaxially arranged inside the rotary screw member 111 . The compression spring exerts a spring force in the direction of pulling out the eccentric shaft 107 to the rear side via the rotary screw member 111 .

On the front side of the eccentric shaft 107, a brake shoe block detachment prevention collar 103 is formed. The brake block drop-off preventing flange 103 prevents the brake block 11B from coming off by pressing the outer edge 115 of each reinforcing plate 19 from the front side.

16(a) is a perspective view of the brake shoe block 11B shown in FIG. 14, FIG. 16(b) is a perspective view of the rotating screw member 111 shown in FIG. 15, and FIG. Fig. 3 is a perspective view of the eccentric shaft 107 shown;

As shown in FIG. 16(a), a brake block fixing recess 117 is formed in the outer edge 115 of the reinforcing plate 19 of each brake block 11B. An eccentric surface 119 of the eccentric shaft 107 contacts the brake block fixing recess 117 .
The eccentric surface 119 is formed of a circular outer peripheral surface that is eccentric with respect to the axis of the eccentric shaft 107 . An engagement projection 123 is formed on the inner edge 121 of the reinforcing plate 19 opposite to the outer edge 115 . The engaging projections 123 of the pair of reinforcing plates 19 are inserted into a pair of brake block fixing grooves 125 (see FIG. 14) in a positioning fixing portion 124 formed in the central portion of the brake shoe head 13, respectively. In the brake shoe block 11B, the engagement projection 123 of the reinforcing plate 19 is inserted into the brake shoe block fixing groove 125 of the brake shoe head 13, and the brake shoe block fixing concave portion 117 of the reinforcing plate 19 is aligned with the eccentric surface 119 of the eccentric shaft 107. By engaging with , falling off in the temporarily assembled state is prevented.

The eccentric shaft 107 is formed with a brake shoe block fall-off prevention collar 103 on the shaft end side of the eccentric surface 119 . The eccentric shaft 107 is formed with a diametrical jig engagement groove 105 on the opposite side of the brake shoe block fall-off prevention collar 103 .

FIGS. 17A, 17B, and 17C are diagrams for explaining the operation during clearance adjustment of the railroad vehicle brake shoe mounting structure according to the reference example.
In the railroad vehicle brake shoe attachment structure according to this reference example, the center of rotation of the eccentric shaft 107 is displaced from the shaft center as shown in FIG. When the eccentric shaft 107 is rotated, as shown in FIG. 17(b), the eccentric surface 119 presses the brake shoe block fixing recess 117, and the brake shoe block 11B moves toward the positioning fixing portion 124 of the brake shoe head 13. be moved. As shown in FIG. 17(c), by rotating the eccentric shaft 107 until it stops, the inner edge 121 of the reinforcing plate 19 comes into contact with the positioning fixing portion 124 of the brake shoe head 13. As shown in FIG. After rotating the eccentric shaft 107, the rotating screw member 111 is rotated to complete the fixation.

In the mounting structure of the railroad vehicle brake shoe according to this reference example, the upper and lower brake shoe blocks 11B are fixed separately, but it is necessary to compensate for the dimensional difference of the parts. In the railroad vehicle brake shoe mounting structure according to this reference example, as shown in FIG. 17, this problem is solved by rotating and fixing the eccentric shaft 107 . However, since the eccentric shaft 107 alone is prone to loosening, a threaded portion 179 is provided at the tip thereof, and a rotating screw member 111 having a female thread 109 is tightened. A compression spring is arranged inside the rotating screw member 111 to urge the brake block 11B against the brake head 13 via the rotating screw member 111 and the eccentric shaft 107 . Since the rear surface of the brake shoe head 13 has a narrow spine and is difficult to work with a normal tool, it is desirable to use a special tool to fasten the eccentric shaft 107 and the rotary screw member 111 in this mounting structure.

Therefore, according to the mounting structure of the railroad vehicle brake shoe according to the present embodiment described above, it is possible to combine the friction materials 21 of different materials, and by fixing them without backlash, noise due to vibration and wear of parts can be reduced. In addition to reducing the number of parts, each part can be made into a simple shape, making it easy to manufacture, replace, and maintain.

In addition, according to the brake shoe blocks 11 and 11A according to the present embodiment, it is possible to combine the friction materials 21 made of different materials, and the reinforcing plate 19 and the friction materials 21 can be made simple in shape to reduce manufacturing, replacement, and maintenance. can be made easier.

It should be noted that the present invention is not limited to the above-described embodiments, and can be modified, improved, etc. as appropriate. In addition, the material, shape, size, number, location, etc. of each component in the above-described embodiment are arbitrary and not limited as long as the present invention can be achieved.

Here, the characteristics of the embodiments of the railroad vehicle brake shoe mounting structure and the brake shoe block according to the present invention described above are briefly summarized below.
[1] A brake shoe block (11, 11A) in which a friction material (21) is fixed to one surface of a reinforcing plate (19) formed in the shape of a rectangular flat plate;
a brake shoe head (13) in which a pair of said brake shoe blocks (11, 11A) are arranged in tandem along a tread (25) of a wheel (23);
provided at both ends of the brake shoe head (13) in the direction of wheel rotation, opposite to the adjacent extended side edges (27) of the reinforcing plate (19) of the pair of the brake shoe blocks (11, 11A) a positioning fixing part (15) for positioning and fixing the fixed side edge (29) of each side;
A state in which the extension side edges (27) of a pair of the brake shoe blocks (11, 11A) are pressed in a direction to expand the distance between them, provided at an intermediate portion of the brake shoe head (13) in the wheel rotation direction. an extended retention mechanism (17, 65, 85) that retains the
A mounting structure for a railroad vehicle brake shoe, comprising:
[2] A notch (35) formed at one end of the extension side edge (27);
The brake shoe head (13) protrudes in correspondence with the notch (35), and engages with the notch (35) to restrict the mounting direction of the brake shoe block (11). an anti-protrusion (37);
The railroad vehicle brake shoe mounting structure according to the above [1], characterized by comprising:
[3] a stationary recess (31) formed in the stationary edge (29);
a fixed-side projection (47) provided on the positioning/fixed part (15) and fitted into the fixed-side recess (31);
The mounting structure of the railroad vehicle brake shoe according to the above [1] or [2], characterized by comprising:
[4] an extension side recess (33) formed in the extension side edge (27);
Provided on the movable members (positive screw movable member 61 and reverse screw movable member 63, first movable member 75 and second movable member 77) of the expansion holding mechanism (17, 65), and fitted into the expansion side recess (33) a mating expansion side protrusion (59);
A railroad vehicle brake shoe mounting structure according to any one of the above [1] to [3], characterized by comprising:
[5] The extension holding mechanism (17) is
A normal threaded portion (51) and a reverse threaded portion (53) are formed at both ends in the axial direction, respectively, and are provided so as to be movable along the wheel rotation direction and relatively rotatable with respect to the brake shoe head (13). a double-ended threaded member (49);
By being screwed into the forward threaded portion (51) and the reverse threaded portion (53) respectively, the pair is configured to press in the direction to expand the interval between the expansion side edges (27). A set of movable members (positive screw movable member 61 and reverse screw movable member 63) interposed between the brake shoe blocks (11),
A railroad vehicle brake shoe attachment structure according to any one of the above [1] to [4], characterized by comprising:
[6] The extension holding mechanism (65) is
a threaded member (73) having a threaded portion (79) formed at one end in the axial direction and provided so as to be movable along the wheel rotation direction and relatively rotatable with respect to the brake shoe head (13);
a first movable member (75) screwed onto the threaded portion (79) and engaged with one of the adjacent expansion side edges (27);
A second movable member provided axially movably on the brake shoe head (13), engages with the other of the adjacent expansion side edges (27), and is pressed against one end of the screw member (73). (77) and
A railroad vehicle brake shoe attachment structure according to any one of the above [1] to [4], characterized by comprising:
[7] Installation of a railroad vehicle brake shoe according to [6] above, characterized in that the second movable member (77) is provided so as not to be rotatable around the axis with respect to the brake shoe head (13). structure.
[8] The extension holding mechanism (85) is
A threaded portion (79) is formed at one end in the axial direction, and a wedge cam (99) is integrally formed along the axial direction. a cam movable member (91) movably provided along;
Sliding inclined surfaces (93) respectively formed on the extension side edge (27) so as to be in sliding contact with the pair of inclined surfaces (101) of the wedge cam (99), respectively;
a rotary screw member (95) that is screwed into the threaded portion (79) and moves the cam movable member (91) axially forward and backward with respect to the brake shoe head (13);
A railroad vehicle brake shoe attachment structure according to any one of the above [1] to [4], characterized by comprising:
[9] Friction material (21) is fixed to one side of a reinforcing plate (19) formed in a rectangular flat plate shape, and arranged in tandem on the brake shoe head (13) along the tread (25) of the wheel (23). a set of brake shoe blocks (11) comprising:
between the adjacent expansion side edge (27) of the reinforcing plate (19) in the pair of brake shoe blocks (11) and the fixed side edge (29) opposite to the expansion side edge (27) A brake shoe block (11), wherein a concave portion (fixed side concave portion 31, expansion side concave portion 33) is formed in at least one of the edges.
[10] The wheel-side sliding surface of the friction material (21) in the brake shoe block (11) is formed in a surface shape that matches the tread surface (25) of the wheel (23),
Both ends of the wheel flange side edge of the reinforcing plate (19) in the brake shoe block (11) are engaged with erroneous assembly prevention projections (37) projecting from the brake shoe head (13). The brake block (11) according to the above [9], characterized in that a notch (35) is formed for restricting the mounting direction of the brake block (11).

11 Brake shoe block 13 Brake shoe head 15 Positioning and fixing part 17 Extended holding mechanism 19 Reinforcing plate 21 Friction material 23 Wheel 25 Tread surface 27 Expansion side edge 29 Fixed side edge 31 Fixed side Concave part 33... Expansion side concave part 35... Notch 37... Incorrect assembly prevention projection 47... Fixed side protrusion 49... Both ends threaded member 51... Positive threaded part 53... Reverse threaded part 59... Extended side protrusion 61... Positive screw movable member (movable member)
63... reverse screw movable member (movable member)

Claims (9)

A brake shoe block in which a friction material is fixed to one surface of a reinforcing plate formed in the shape of a rectangular flat plate;
a brake head having a set of said brake blocks arranged in tandem along the tread of the wheel;
Positioning and fixing portions provided at both ends of the brake shoe head in the wheel rotation direction to position and fix the adjacent expansion side edge and opposite fixed side edge of the reinforcing plate of the pair of brake shoe blocks, respectively and,
an expansion holding mechanism provided at an intermediate portion of the brake shoe head in the wheel rotation direction and holding the space between the expansion side edges of the pair of the brake shoe blocks in a state of being pressed in a direction to expand;
a fixed-side recess formed in the fixed-side edge;
a fixed-side protrusion that is provided on the positioning fixing portion and that restricts movement of the brake block in the tread width direction with respect to the brake shoe head by fitting into the fixed-side recess;
A mounting structure for a railroad vehicle brake shoe, comprising: A brake shoe block in which a friction material is fixed to one surface of a reinforcing plate formed in the shape of a rectangular flat plate;
a brake head having a set of said brake blocks arranged in tandem along the tread of the wheel;
Positioning and fixing portions provided at both ends of the brake shoe head in the wheel rotation direction to position and fix the adjacent expansion side edge and opposite fixed side edge of the reinforcing plate of the pair of brake shoe blocks, respectively and,
an expansion holding mechanism provided at an intermediate portion of the brake shoe head in the wheel rotation direction and holding the space between the expansion side edges of the pair of the brake shoe blocks in a state of being pressed in a direction to expand;
an extension-side recess formed in the extension-side edge;
an extension-side protrusion provided on the movable member of the extension holding mechanism and adapted to restrict movement of the brake block in the width direction of the tread with respect to the brake shoe head by fitting into the extension-side recess;
A mounting structure for a railroad vehicle brake shoe, comprising: A brake shoe block in which a friction material is fixed to one surface of a reinforcing plate formed in the shape of a rectangular flat plate;
a brake head having a set of said brake blocks arranged in tandem along the tread of the wheel;
Positioning and fixing portions provided at both ends of the brake shoe head in the wheel rotation direction to position and fix the adjacent expansion side edge and opposite fixed side edge of the reinforcing plate of the pair of brake shoe blocks, respectively and,
an expansion holding mechanism provided at an intermediate portion of the brake shoe head in the wheel rotation direction and holding the space between the expansion side edges of the pair of the brake shoe blocks in a state of being pressed in a direction to expand;
with
The extension retention mechanism is
a double-ended threaded member having a positive threaded portion and a reverse threaded portion formed at both ends in the axial direction, and provided so as to be movable along the wheel rotation direction and relatively rotatable with respect to the brake shoe head;
By being screwed into the forward threaded portion and the reverse threaded portion, respectively, it is configured to press in the direction to expand the interval between the expansion side edges, and is interposed between the pair of brake shoe blocks. a set of moveable members arranged together;
A mounting structure for a railroad vehicle brake shoe, comprising: A brake shoe block in which a friction material is fixed to one surface of a reinforcing plate formed in the shape of a rectangular flat plate;
a brake head having a set of said brake blocks arranged in tandem along the tread of the wheel;
Positioning and fixing portions provided at both ends of the brake shoe head in the wheel rotation direction to position and fix the adjacent expansion side edge and opposite fixed side edge of the reinforcing plate of the pair of brake shoe blocks, respectively and,
an expansion holding mechanism provided at an intermediate portion of the brake shoe head in the wheel rotation direction and holding the space between the expansion side edges of the pair of the brake shoe blocks in a state of being pressed in a direction to expand;
with
The extension retention mechanism is
a threaded member having a threaded portion formed at one end in the axial direction and provided so as to be movable along the wheel rotation direction and relatively rotatable with respect to the brake shoe head;
a first movable member that is screwed onto the threaded portion and engages one of the adjacent expansion side edges;
a second movable member provided axially movably on the brake shoe head, engaged with the other of the adjacent expansion side edges, and pressed against one end of the screw member;
A mounting structure for a railroad vehicle brake shoe, comprising: 5. The attachment structure of a railroad vehicle brake shoe according to claim 4 , wherein said second movable member is provided so as not to be rotatable about an axis with respect to said brake shoe head .
A mounting structure for a railroad vehicle brake shoe, comprising: A brake shoe block in which a friction material is fixed to one surface of a reinforcing plate formed in the shape of a rectangular flat plate;
a brake head having a set of said brake blocks arranged in tandem along the tread of the wheel;
Positioning and fixing portions provided at both ends of the brake shoe head in the wheel rotation direction to position and fix the adjacent expansion side edge and opposite fixed side edge of the reinforcing plate of the pair of brake shoe blocks, respectively and,
an expansion holding mechanism provided at an intermediate portion of the brake shoe head in the wheel rotation direction and holding the space between the expansion side edges of the pair of the brake shoe blocks in a state of being pressed in a direction to expand;
with
The extension retention mechanism is
A wedge cam is formed integrally along the axial direction with a threaded portion formed at one end in the axial direction, and the cam is provided movably along the direction intersecting the wheel rotation direction with respect to the brake shoe head. a movable member;
Sliding inclined surfaces respectively formed on the extended side edges so as to be in sliding contact with the pair of inclined surfaces of the wedge cam, respectively;
a rotary screw member that is screwed into the threaded portion and moves the cam movable member axially forward and backward with respect to the brake shoe head;
A mounting structure for a railroad vehicle brake shoe, comprising: a notch formed at one end of the extension-side edge;
an erroneous assembly prevention protrusion protruding from the brake shoe head corresponding to the notch and engaging with the notch to restrict the mounting direction of the brake shoe block;
The mounting structure for a railroad vehicle brake shoe according to any one of claims 1 to 6, characterized by comprising: A pair of brake shoe blocks with a friction material fixed to one surface of a reinforcing plate formed in the shape of a rectangular flat plate and arranged in tandem on the brake shoe head along the tread surface of the wheel,
At least one edge of the adjacent expansion side edge of the reinforcing plate in the pair of brake shoe blocks and the fixed side edge opposite to the expansion side edge is provided at the brake shoe head A concave portion is formed to restrict the movement of the brake block in the width direction of the tread with respect to the brake shoe head by fitting into the fixed-side protrusions of the positioning fixing portions provided at both ends in the wheel rotation direction.
A brake shoe block characterized by: The wheel-side sliding surface of the friction material in the brake block is formed in a surface shape that matches the tread surface of the wheel,
The mounting direction of the brake shoe block is regulated by engaging erroneous assembly prevention projections protruding from the brake shoe head at both ends of the wheel flange side edge of the reinforcing plate of the brake shoe block. 9. A brake shoe block according to claim 8, characterized in that notches are formed .

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