JPH0714676Y2 - Brake shoe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a brake shoe suitable for landing braking of a high-speed linear motor car, a superconducting levitation vehicle, or the like.

[Conventional technology]

A conventional brake shoe for a railway vehicle is disclosed in, for example, Japanese Patent Laid-Open No. 62-35121. In this brake shoe, a back metal to which a friction member is heated and adhered is fixed to a pad mounting plate by rivets, and the pad mounting plate is slidably inserted into grooves on both sides of the pressing plate. The pad mounting plate and the pressing plate are supported by the pair of anchor pins by the caliper. The braking torque generated by the friction member slidingly contacting the brake disc is transmitted from the pad mounting plate to both anchor pins.

[Problems to be solved by the device]

However, in such a conventional brake shoe, a friction member made of an organic or metallic material and a back metal are heat-bonded to each other, and the back metal is fixed to a pad mounting plate by a rivet to provide a brake shoe. Since the structure is complicated, the structure is complicated and the pad mounting plate can be reused by removing the rivet when the friction member is worn due to use, but the friction member is heated and adhered. There was a problem that it was impossible to reuse the back metal.
In particular, in the case of a landing brake shoe used in a superconducting levitation vehicle, it is necessary to manufacture all of the components with non-magnetic material, and since it is generally expensive, it is strongly recommended to reuse the components. Was wanted.

[Means for Solving the Problems]

The present invention has been made in view of such a conventional technical problem, and has a structure in which protrusions are formed at lower portions on both sides of a friction member and friction is generated in engagement grooves formed on both sides of a back plate. Both projecting portions of the member are engaged with each other, the sliding friction surface serving as the upper surface of the friction member is projected from the back plate, and the lower ends of both ends in the acting direction of the braking friction force of the friction member are elastically deformable. A brake shoe that is supported by a locking portion of the back plate via a cushioning member, and at least one of the locking portions is a locking member fixed to the back plate with a detachable fastener. is there.

[Action]

If the brake shoe having such a structure is installed for landing on a high-speed linear motor car or a superconducting levitation vehicle, the friction member slides on the track surface of concrete or the like to generate a braking friction force. Then, this braking frictional force is, through the elastically deformable cushioning member, in accordance with the traveling direction of the vehicle,
It is supported by a locking portion of the back plate or a locking member fixed to the back plate.

Further, an increase in volume when the friction member expands due to frictional heat due to braking is absorbed by the gap between the elastically deformable cushioning member and the engagement groove.

If the friction member is worn due to use, the locking member is removed, the friction member is removed from the back plate, and a new friction member is attached to the back plate for reuse. If necessary, the cushioning member can also be replaced with a new one.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show a brake shoe according to an embodiment of the present invention, which shows a right half portion of a symmetrical brake shoe. In the drawings, reference numeral 1 indicates a friction member, and the friction member 1 is formed to have a trapezoidal cross section as shown in FIGS. 4 to 6, and is formed with projecting portions 1a and 1b having acute angles on both lower sides, Further, notches 1d and 1e for receiving buffer members 5 and 6 which will be described later are formed at the lower portions of both ends.

Reference numeral 2 is a back plate, and as shown in FIGS. 7 to 9, the protrusions of the friction member 1 are provided on both side portions except for both end portions and intermediate portions which are thin.
Engaging grooves 2a, 2b that slidably receive 1a, 1b are formed facing each other. The inner surface of the back plate 2 except the both ends of the portion where the engagement grooves 2a, 2b are formed forms a friction member receiving portion 2c that matches the wide lower surface of the friction member 1 that is a flat surface.

Then, both ends of the back plate 2 form end flat portions 2d, and engaging projections 2f project from the center of the tip end portion of the end flat portions 2d. In this embodiment, the two friction members 1 are attached to the back plate 2 in an abutting state via the intermediate portion locking member 4 which will be described later. Has a central flat portion 2g formed by interrupting the engagement grooves 2a, 2b. The end flat portion 2d and the central flat portion 2g are thinner than the friction member receiving portion 2c, and particularly the engaging protrusion 2f.
Is formed lower than the friction member receiving portion 2c. Further, lower portions of both ends of the back plate 2 where the engaging grooves 2a and 2b are formed are cut off so as to be connected to the end flat portions 2d and the central flat portion 2g, respectively, to accommodate buffer members 5 and 6 described later. The parts 2i and 2j are formed. 2k and 2l are bolt holes formed on both sides of the central flat portion 2g, and 2m and 2n are bolt holes formed on both sides of the end flat portion 2d.

Reference numeral 3 denotes an end locking member that functions as a locking portion of the back plate 2 for locking the friction member 1. As shown in FIGS. A concave portion 3a that tightly receives the mating protrusion 2f is formed, and a protruding portion 3d that abuts and supports the lower outer end of the friction member 1 via the buffer member 6 is formed on the other side of the intermediate portion, and thin portions at both ends are formed. Has bolt holes 3b and 3c. Reference numeral 4 denotes an intermediate portion locking member that functions as a locking portion of the back plate 2, and as shown in FIGS. Protrusions 4c that abut and support are formed, and bolt holes 4 are
a and 4b are drilled.

5 and 6 are cushioning members, and the cushioning members 5 and 6 have heat resistance,
In addition, a porous material (for example, a carbon fiber aggregate) that can absorb the thermal expansion of the friction member 1 by elastic deformation is used.
As shown in the drawing, the back plate 2 is formed in a shape that fits the housing portions 2i, 2j and the engagement grooves 2a, 2b.

The brake shoe made up of such components is assembled as follows. First, with the intermediate portion locking member 4 removed, the thin plate-shaped cushioning members 5 are inserted into the housing portions 2j on both sides of the central flat portion 2c of the back plate 2 to attach the intermediate portion locking member 4 to the back plate 2. While being tightly inserted in the central flat portion 2c of the above, the bolt / nut 7, which is a detachable fastener, is tightened via the vehicle body side shoe mounting portion 9. Next, with the end locking member 3 removed, the protrusions 1a and 1b of the friction member 1 are inserted along the engagement grooves 2a and 2b of the back plate 2, and then the accommodating portion 2i of the back plate 2 is inserted. Insert a thin plate-like cushioning member 6 into the recessed portion 3a of the end locking member 3,
The engaging protrusion 2f of the back plate 2 is received, and the bolt and nut 8 which is a detachable fastener is tightened through the vehicle body side shoe mounting portion 9.

By the way, when the friction member 1 is assembled to the back plate 2, in addition to the inevitable engagement gap between the engagement grooves 2a, 2b and the protrusions 1a, 1b, the friction member 1 and the back plate 2 It is desired to properly secure a gap according to the difference in thermal expansion from the No. 2 alloy. Further, a material having a high thermal conductivity is used for the friction member 1, and when the friction member 1 is brought into sliding contact with the raceway surface and rises in temperature, a thermal strain that causes plastic strain due to excessive thermal stress in the back plate 2 is generated. When adverse effects occur, it is desirable to interpose a suitable heat insulating material on the boundary surface between the friction member 1 and the back plate 2.

In this way, the both ends of the friction member 1 in which the protrusions 1a, 1b on both sides are held in the engaging grooves 2a, 2b are respectively buffer members 5, 6
The sliding friction surface 1c, which is the upper surface of the friction member 1 and is abutted and supported by the projection 3d of the end locking member 3 and the projection 4c of the intermediate locking member 4 via the back plate 2, It is protruding.

When the brake shoe is used for landing on a superconducting levitation vehicle, all the constituent elements must be made of non-magnetic material, and the friction member 1 has a high melting point and high wear resistance. The back plate 2 and both locking members 3 and 4 such as molybdenum, tungsten and their alloys are light in weight and titanium alloy and aluminum alloy having high specific strength, and the cushioning members 5 and 6 are carbon fiber aggregates as described above. The bolts and nuts 7 and 8 are made of stainless steel or the like.

Next, the operation will be described.

The brake shoe having such a structure is equipped as a landing brake shoe for a high-speed linear motor car or a superconducting levitation vehicle. At the time of landing braking, the impact force and the braking friction force generated by the friction member 1 slidingly contacting the track surface made of concrete are fixed to the back plate 2 via the buffer members 5 and 6 depending on the traveling direction of the vehicle. It is supported by the intermediate locking member 4 and the end locking member 3. As a result, the impact force in the friction direction during high-speed traveling is favorably relaxed by the cushioning member 5 or the cushioning member 6, and damage such as cracking of the friction member 1 is prevented. This impact force remarkably occurs particularly when there are seam steps or irregularities on the raceway surface made of concrete or the like.

Then, the friction member 1 expands due to the frictional heat accompanying the braking, and the increase in the volume due to the expansion is caused by the elastic deformation of the porous cushioning members 5 and 6 and the gap between the engaging grooves 2a and 2b. Since the restraint of the friction member 1 and the back plate 2 due to the thermal expansion is absorbed, the plastic deformation of these and the generation of thermal cracks of the friction member 1 are reduced.

If the friction member 1 is worn due to use, the end locking member 3 and the intermediate locking member 4 as necessary are removed, the friction member 1 is removed from the back plate 2, and then a new friction member 1 is removed. It is attached to the back plate 2 for reuse as described above. If necessary, the cushioning member 5 or 6 is also replaced with a new one.

19 to 21 show other structural examples of the friction member 1 and the back plate 2 in cross section. Protrusion of friction member 1 shown in FIG.
The engaging grooves 1a, 1b and the engaging grooves 2a, 2b of the back plate 2 have substantially the same trapezoidal shape as in the above-mentioned embodiment, but the upper part on the sliding friction surface 1c side of the friction member 1 covers the upper surface of the back plate 2. There is. The protrusions 1a ', 1b' of the friction member 1 and the engaging grooves 2a ', 2b' of the back plate 2 shown in FIG.
Has a U-shape that conforms to the sliding friction surface 1c of the friction member 1.
The side upper part covers the upper surface of the back plate 2. The protrusions 1a ", 1b" of the friction member 1 and the engaging groove 2 of the back plate 2 shown in FIG.
The a ″ and 2b ″ have a U-shape that fits, and the upper portion of the friction member 1 on the sliding friction surface 1c side releases the upper surface of the back plate 2.
According to each of the structural examples as described above, it is possible to obtain substantially the same operation as that of the above-described embodiment.

In the above-described embodiment, two friction members 1 are attached to the back plate 2 in the acting direction of the braking friction force. However, one friction member 1 is attached to the back plate 2 or the braking friction force acts. 3 in the direction
It is also possible to attach more than one friction member 1.

[Effect of device]

As can be understood from the above description, according to this invention, the following effects can be obtained.

(1). Since the cushioning members are interposed at both ends of the friction member in the direction in which the braking friction force acts, the impact force acting on the friction member is mitigated, and the damage to the end portion of the friction member is favorably prevented.

(2). Due to the elastically deformable cushioning member or the gap between the friction member and the engaging groove of the back plate, the restraint due to the thermal expansion of the friction member is significantly alleviated, and the occurrence of cracks in the friction member and the friction member and the back plate. Since the plastic deformation is reduced, the friction and loss of the friction member is prevented, uneven wear due to the plastic deformation and the fluctuation of the braking friction force are suppressed, and at the same time, the reusability due to the plastic deformation of the back plate is also avoided.

(3). Since the friction member, which is a consumable item, can be replaced and the back plate can be used repeatedly, the simple structure makes it possible to maintain both durability of the friction member and use of parts according to the degree of wear. It is possible to provide an inexpensive brake shoe.

[Brief description of drawings]

1 to 18 show one embodiment of the present invention, FIG. 1 is a front view showing a brake shoe, FIG. 2 is a plan view of the same, FIG. 3 is a side view of the same without a fixing tool, and FIG. The figure shows the front view of the friction member, FIG. 5 shows the same plan view, FIG. 6 shows the same side view, FIG. 7 shows the back plate showing the front view, FIG. 8 shows the same plan view, and FIG. 9 shows the same side view. Fig. 10 is a front view showing an end locking member, Fig. 11 is a plan view thereof, Fig. 12 is a side view thereof, Fig. 13 is a front view showing an intermediate locking member, and Fig. 14 is The same plan view, FIG. 15 is the same side view, FIG.
The drawing is a front view showing a cushioning member, FIG. 17 is a plan view thereof, FIG. 18 is a side view thereof, and FIGS. 19 to 21 are sectional views showing other structural examples of a friction member and a back plate, respectively. 1: Friction member, 1a, 1b: Projection, 1c: Sliding friction surface, 2: Back plate, 2a, 2
b: Engagement groove, 3: End locking member (locking part), 4: Intermediate locking member (locking part), 5,6: Buffer member, 7,8: Bolt / nut (fixing device) , 9: Chassis mounting part on the vehicle body side.

Claims (1)

[Scope of utility model registration request] Claims: 1. Sliding friction which forms upper surfaces of the friction member by forming protrusions on both lower sides of the friction member, and engaging both protrusions of the friction member with engaging grooves formed on both sides of the back plate. The surface is projected from the back plate, and the lower ends of both ends of the friction member in the acting direction of the braking friction force are supported by the locking portions of the back plate through elastically deformable cushioning members, respectively. A brake shoe characterized in that at least one of the portions is constituted by a locking member fixed to the back plate with a detachable fastener.