JP2021110376A - brake disc - Google Patents

Abstract

To reliably prevent a fastening bolt for fastening a brake disc to a wheel from coming off.SOLUTION: A bolt fastening fin part 2 of a first brake disc 1 is provided with a fin part body 2a that surrounds a wheel side bolt insertion hole 20c. The back surface of the fin part body 2a is provided with: a bolt insertion notch part 2b that slides a bolt head 21a of a fastening bolt 21 along the back surface of a plate part 1a to a position facing the wheel side bolt insertion hole 20c; and a part to be fastened 2c that is fastened to the fastening bolt 21 and press-contacts the peripheral edge of the wheel side bolt insertion hole 20c.SELECTED DRAWING: Figure 1A

Description

The present invention relates to a brake disc used in a vehicle such as a railroad vehicle.

In this type of brake disc, for example, as in Patent Document 1, a brake disc in which a sliding portion is fastened with a bolt is known. The radial distance between the center of the fastening hole provided in this sliding portion and the position that contacts the wheel on the innermost peripheral side is d1, and the radius between the center of the fastening hole and the position that contacts the wheel on the outermost peripheral side. When the distance in the direction is d2 and the radial length of the sliding surface provided on the sliding portion is L, d2 / L is 0.25 or more and d1 / d2 is 0.3 to 1.5. I am trying to do it. As a result, the contact width in the circumferential direction with the wheels on the inner and outer circumferences of the brake disc is sufficiently secured, and the contact surface pressure during braking is reduced.

Japanese Patent No. 4305296

Brake discs such as those in Patent Document 1 aim to improve the cooling performance during braking and the durability of bolts, but do not consider preventing bolts from coming off.

Focusing on the above problems, it is an object of the present invention to reliably prevent the fastening bolts for fastening the brake discs to the wheels from coming off.

In order to achieve the above object, in the present invention, the fastening bolt is not inserted into the bolt fastening fin portion in the fastening direction as in the conventional case, but is inserted by sliding along the back surface of the plate portion. I did.

Specifically, in the first invention,
A donut-shaped disc-shaped plate with the surface side as the sliding surface,
The target is a brake disc provided on the back surface of the plate portion and provided with a bolt fastening fin portion for fastening a fastening bolt inserted into a wheel side bolt insertion hole of the wheel.

And the fin part for fastening the bolt is
The fin body that surrounds the wheel side bolt insertion hole and
A bolt insertion notch provided in the fin body and allowing the bolt head of the fastening bolt to slide along the back surface of the plate to pass to a position facing the wheel side bolt insertion hole.
It is provided on the fin portion main body, and is provided with a portion to be fastened to the fastening bolt and press-contacted with the peripheral edge of the wheel-side bolt insertion hole.

According to the above configuration, it is not necessary to make a hole larger than the bolt head of the fastening bolt in order to insert the fastening bolt through the plate portion. Therefore, even if the fastening bolt is loosened, the fastening bolt will not pass through the bolt insertion notch and come out.

In the second invention, in the first invention,
The above fastening bolt is a bolt with a hole.
The plate portion is provided with a tool insertion hole for rotating and screwing the bolt head of the fastening bolt.
The inner diameter of the tool insertion hole is smaller than the bolt head of the fastening bolt.

According to the above configuration, the fastening bolt does not need to be inserted along the fastening direction (screw-in direction), so that the tool insertion hole is a tool fitting such as a hexagonal hole provided in the bolt head of the perforated bolt. A hexagon wrench or the like may be inserted into the portion to make it large enough to be fastened.

In the third invention, in the second invention,
A nut to which the tip of the fastening bolt is fastened is prevented from rotating at the bolt fastening fin portion provided on the plate portion attached to the wheel on the opposite side of the plate portion provided with the bolt insertion notch. It is fitted in the state or tapped so that the tip of the fastening bolt is fastened.

According to the above configuration, a pair of brake discs can be prevented from coming off by providing a tapping process or a nut for fastening the fastening bolts on the plate portion opposite to the plate portion through which the bolt head is slid and inserted. It is securely fixed to the wheel by the broken fastening bolt.

In the fourth invention, in the third invention,
The tool insertion hole is not provided in the plate portion attached to the wheel on the side opposite to the plate portion provided with the bolt insertion notch.

According to the above configuration, the plate portion on the opposite side of the bolt head does not require a tool insertion hole for rotating the bolt head. For this reason, it is possible to save the trouble of machining the tool insertion hole, and the area of the sliding surface is increased by the amount of no hole, the braking effect is improved, and the durability is also improved. In addition, wind noise is less likely to occur, and nuts and bolts do not come off.

In the fifth invention, in the first invention,
The plate portion is provided with a tool insertion hole for rotating and screwing a hexagon socket nut to be fastened to the fastening bolt.
The inner diameter of the tool insertion hole is smaller than that of the hexagon socket nut.

According to the above configuration, the fastening bolt does not need to be inserted along the fastening direction (screw-in direction), so that the tool insertion hole is hexagonal in the tool fitting portion such as the hexagonal hole provided in the perforated nut. The size may be large enough to be fastened by inserting a wrench or the like.

As described above, according to the present invention, the fastening bolt is inserted by sliding the bolt head of the fastening bolt along the back surface of the plate portion using the bolt insertion notch. It is not necessary to provide a through hole for the plate portion, and it is possible to reliably prevent the fastening bolt from coming off.

FIG. 2B is an enlarged cross-sectional view taken along the line IA-IA. It is an enlarged side view seen from the notch part side for bolt insertion. It is a perspective view which looked at the wheel to which the brake disc which concerns on embodiment of this invention are fastened from the side opposite to the flange. It is a perspective view which looked at the wheel to which the brake disc which concerns on embodiment of this invention are fastened from the flange side. It is an enlarged perspective view which shows the bolt fastening fin portion on the bolt head side, and the periphery thereof. It is a perspective view which shows the fin part for fastening a bolt on a nut side, and the periphery thereof enlarged. It is an enlarged perspective view which shows the bolt fastening fin portion, the fastening bolt, the nut, and the periphery thereof on the bolt head side. It is a rear view which shows the back surface of the 1st brake disc which concerns on embodiment of this invention. It is a rear view which shows the back surface of the 2nd brake disc which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1A to 4B show brake discs 1 and 11 for a railroad vehicle according to an embodiment of the present invention, and the brake discs 1 and 11 are mounted on both front and back surfaces of a disc portion 20a of a wheel 20 of a railroad vehicle, for example. The fastening bolt 21 and the nut 22 are detachably attached to each other. The wheel 20 is provided with a flange portion 20b having a larger outer diameter than the other portions, but the first brake disc 1 on the fastening bolt 21 side is fixed inside the flange portion 20b side in the width direction of the railcar. The second brake disc 11 on the nut 22 side is fixed to the outside in the width direction of the railroad vehicle on the side opposite to the flange portion 20b. The fastening bolt 21 and nut 22 may be fastened together with a washer 23 such as a flat washer or a spring washer. The first and second brake discs 1 and 11 are made of, for example, cast steel.

As shown in FIGS. 3A and 4A, the first brake disc 1 includes a donut-shaped plate-shaped plate portion 1a having a circular opening in the center with the surface side (outer surface side) as the sliding surface. ing. A plurality of bolt fastening fin portions 2 are integrally projected on the back surface (inner surface surface) of the plate portion 1a at intervals from each other. In the bolt fastening fin portion 2, the fastening bolt 21 is not inserted into the bolt fastening fin portion 2 in the fastening direction as in the conventional case, but the bolt head 21a is inserted along the back surface of the plate portion 1a in FIG. 3A. I try to insert it by sliding it in the direction of the arrow.

Specifically, the bolt fastening fin portion 2 is fastened with the fastening bolt 21 to be inserted into the wheel side bolt insertion hole 20c of the wheel 20. The fastening bolt 21 is, for example, a hexagon socket head cap screw. The bolt fastening fin portion 2 includes, for example, a box-shaped fin portion main body 2a that surrounds the wheel side bolt insertion hole 20c. The fin portion main body 2a is provided with a bolt insertion notch 2b for sliding the bolt head 21a of the fastening bolt 21 along the back surface of the plate portion 1a to a position facing the wheel side bolt insertion hole 20c. There is. As also shown in FIG. 1B, the bolt insertion notch 2b includes a narrow portion having a width through which the screw portion of the fastening bolt 21 passes and a wider portion having a width through which the bolt head 21a passes. Is provided so that the bolt head 21a does not come out. Further, the fin portion main body 2a is provided with a fastened portion 2c that is fastened to the fastening bolt 21 and press-contacted with the peripheral edge of the wheel-side bolt insertion hole 20c.

A tool insertion hole 2d for rotating and screwing the bolt head 21a of the fastening bolt 21 is provided in a portion of the plate portion 1a on the bolt head 21a side corresponding to the fastening position of the fastening bolt 21. The inner diameter of the tool insertion hole 2d is smaller than that of the bolt head 21a of the fastening bolt 21. If the bolt head 21a of the fastening bolt 21 is provided with a hexagonal hole as shown in the drawing, the fastening bolt 21 is rotated by a hexagon wrench.

As shown in FIGS. 3B and 4B, most of the second brake disc 11 is the same as the first brake disc 1 and has a circular opening in the center with the front surface side (outer surface side) as the sliding surface. It is provided with a donut-shaped plate-shaped plate portion 11a provided with the above. A plurality of bolt fastening fin portions 12 are integrally projected on the back surface (inner surface surface) of the plate portion 11a at intervals from each other. In this bolt fastening fin portion 12, the fastening bolt 21 is not inserted into the bolt fastening fin portion 12 in the fastening direction as in the conventional case, but the nut 22 is enlarged as shown in FIG. 3B. It is inserted by sliding it along the back surface of the plate portion 11a.

The bolt fastening fin portion 12 is provided on the back surface of the plate portion 11a, and a nut 22 into which the fastening bolt 21 inserted into the wheel side bolt insertion hole 20c of the wheel 20 is screwed is fastened. The bolt fastening fin portion 12 includes a box-shaped fin portion main body 12a similar to the first brake disc 1. In the fin portion main body 12a, a bolt insertion notch portion 12b through which a nut 22 into which a fastening bolt 21 is screwed is slid along the back surface of the plate portion 11a and passed to a position facing the wheel side bolt insertion hole 20c. Is formed. As also shown in FIG. 1B, the bolt insertion notch 12b also has a narrow portion having a width through which the cylindrical portion of the fastening bolt 21 passes and a wider portion having a width through which the nut 22 passes. By being provided, the nut 22 is prevented from coming off. The fin portion main body 12a is also provided with a fastened portion 12c that is fastened to the nut 22 and press-contacted with the plate portion 11a.

As shown in FIGS. 1B, 3B and 3C, the nut 22 has a pair of flat surfaces 22a that abut on the pair of inner surfaces of the fin body 12a, whereby the bolt insertion notch 12b The nut 22 inserted through the nut 22 is fixed at an appropriate position of the fin portion main body 12a in a derotated state. Therefore, the nut 22 side does not need a tool insertion hole 2d for inserting a tool.

It can be said that the first brake disc 1 is merely machined with the tool insertion hole 2d for the second brake disc 11 except for the difference between the fastening bolt 21 and the nut 22 accommodated in the fin portion main body 2a. .. Therefore, since the first brake disc 1 and the second brake disc 11 can be molded with the same mold, it is not necessary to prepare different molds, and the manufacturing cost is reduced.

As shown in FIGS. 4A and 4B, the first brake disc 1 and the second brake disc 11 are provided with a total of 12 bolt fastening fin portions 2 and 12 at intervals of 30 °. This number is not necessarily limited to 12, and may be large or small. Further, an auxiliary fin portion may be integrally provided between the pair of bolt fastening fin portions 2. Although not shown, rib portions extending in the circumferential direction connecting the bolt fastening fin portions 2 and 12 may be provided on the back surface of the plate portion 1a.

In this way, as shown in FIG. 1A, the pair of brake discs 1 and 11 are fastened by inserting the disc portions 20a of the wheel 20 into the wheel side bolt insertion holes 20c in a state of being sandwiched from both sides in the thickness direction. By fastening the nut 22 to the bolt 21, the nut 22 is detachably fixed to the wheel 20.

Next, a procedure for actually assembling the brake discs 1 and 11 to the wheels 20 will be described.

First, as shown in FIG. 3B, the nuts 22 are fitted into the bolt insertion notches 12b of all the bolt fastening fin portions 12 of the second brake disc 11 in the direction of the arrow along the back surface of the plate portion 11a. At this time, a washer 23 having the same shape in a plan view may be sandwiched. If the pair of flat surfaces 22a of the nut 22 is inserted into the pair of side surfaces of the bolt fastening fin portion 12, the nut 22 is prevented from rotating.

Next, the second brake disc 11 is installed on the ground or the like with its sliding surface side facing downward. At this time, some mark may be provided so that the wheel side bolt insertion hole 20c comes to the position of the nut 22.

Next, the brake disc 20b is placed on the second brake disc 11 with the flange portion 20b facing down.

Next, as shown in FIG. 3A, the bolt head 21a of the fastening bolt 21 is fitted into the bolt insertion notch 2b of the first brake disc 1 in the direction of the arrow and along the back surface of the plate portion 1a in the direction of the arrow. ..

Next, the first brake disc 1 into which the fastening bolt 21 is fitted is fitted into the disk portion 20a of the wheel 20. At this time, some kind of mark may be provided so that the tip of the fastening bolt 21 comes to the position of the nut 22.

Finally, the fastening bolts 21 are sequentially tightened with a predetermined tightening torque.

As described above, in the present embodiment, the fastening bolt 21 does not need to be inserted along the fastening direction (screw-in direction), so that the tool insertion hole 2d is a hexagon provided in the bolt head 21a of the fastening bolt 21. A hexagon wrench or the like may be inserted into the hole to make it large enough to be fastened.

Therefore, even if the fastening bolt 21 is loosened, the fastening bolt 21 does not pass through the wheel-side bolt insertion hole 20c and come out.

Further, the plate portion 11a of the second brake disc 11 does not need a tool insertion hole 2d for rotating the bolt head 21a. Therefore, it is possible to save the trouble of machining the tool insertion hole 2d, and the area of the sliding surface is increased by the amount of no hole, the braking effect is improved, and the durability is also improved. In addition, wind noise is less likely to occur, and the nut 22 and the fastening bolt 21 do not come off. Therefore, in the present embodiment, it is possible to reliably prevent the fastening bolt 21 from coming off.

(Other embodiments)
The present invention may have the following configuration with respect to the above embodiment.

That is, in the above embodiment, an example of a hexagon socket head cap screw is shown as the fastening bolt 21, but the present invention is not limited to this, and for example, the hole provided in the bolt head 21a of the fastening bolt 21 is not limited to the hexagonal hole. , Triangle, quadrangle and other shapes may be used. Further, the fastening bolt 21 may be a countersunk screw or a hexagon bolt. When the fastening bolt 21 is composed of a hexagon bolt, a nut with a hexagon socket can be used on the opposite side. In that case, the hexagon socket head nut is on the first brake disc 1 side, and the hexagon bolt head side is on the second brake disc.

In the above embodiment, the bolt fastening fin portion 12 of the second brake disc 11 is provided with a nut 22 to which the tip of the fastening bolt 21 is fastened, but the fin 22 is not provided. The portion main body 2a may be tapped so that the tip of the fastening bolt 21 is fastened. Then, the trouble of assembling the nut 22 to the bolt fastening fin portion 12 can be saved.

It should be noted that the above embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its applications and applications.

1 1st brake disc
1a board
2 Bolt fastening fins
2a Fin body
2b Notch for bolt insertion
2c to be fastened
2d tool insertion hole
11 2nd brake disc
11a board
12 Bolt fastening fins
12a Fin body
12b Notch for bolt insertion
12c to be fastened
20 wheels
20a disk part
20b Flange part
20c Wheel side bolt insertion hole
21 Fastening bolts
21a bolt head
22 nuts
23 washer

Claims (5)

A donut-shaped disc-shaped plate with the surface side as the sliding surface,
A brake disc provided on the back surface of the plate portion and provided with a bolt fastening fin portion for fastening a fastening bolt inserted into a wheel side bolt insertion hole of the wheel.
The above bolt fastening fins
The fin body that surrounds the wheel side bolt insertion hole and
A bolt insertion notch provided in the fin body and allowing the bolt head of the fastening bolt to slide along the back surface of the plate to pass to a position facing the wheel side bolt insertion hole.
A brake disc provided on the fin portion main body, which is provided with a fastening portion which is fastened to the fastening bolt and is pressed against the peripheral edge of the wheel side bolt insertion hole. In the brake disc of claim 1,
The above fastening bolt is a bolt with a hole.
The plate portion is provided with a tool insertion hole for rotating and screwing the bolt head of the fastening bolt.
A brake disc characterized in that the inner diameter of the tool insertion hole is smaller than the bolt head of the fastening bolt. In the brake disc of claim 2,
A nut to which the tip of the fastening bolt is fastened is prevented from rotating at the bolt fastening fin portion provided on the plate portion attached to the wheel on the opposite side of the plate portion provided with the bolt insertion notch. A brake disc that is fitted in a state or is tapped so that the tip of the fastening bolt is fastened. In the brake disc of claim 3,
A brake disc characterized in that the plate portion attached to the wheel on the side opposite to the plate portion provided with the notch for bolt insertion is not provided with the tool insertion hole. In the brake disc of claim 1,
The plate portion is provided with a tool insertion hole for rotating and screwing a hexagon socket nut to be fastened to the fastening bolt.
A brake disc characterized in that the inner diameter of the tool insertion hole is smaller than that of the hexagon socket head nut.

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