JP7424881B2 - Brake disc and its fastening method - Google Patents

Description

The present invention relates to a brake disc used in a vehicle such as a railway vehicle and a method for fastening the brake disc.

As this type of brake disc, a brake disc whose sliding portion is fastened with bolts is known, for example, as disclosed in Patent Document 1. The distance in the radial direction between the center of the fastening hole provided in this sliding part and the position that contacts the wheel on the innermost side is d1, and the radius between the center of the fastening hole and the position that contacts the wheel on the outermost side When the distance in the direction is d2 and the radial length of the sliding surface provided on the sliding part is L, d2/L is 0.25 or more and d1/d2 is 0.3 to 1.5. That's what I do. This ensures a sufficient circumferential contact width between the inner and outer peripheries of the brake disc and the wheel, thereby reducing the contact surface pressure during braking.

Patent No. 4305296

The brake disc disclosed in Patent Document 1 aims to improve the cooling performance during braking and the durability of the bolts, but does not take into account the prevention of the bolts from coming off.

The present invention has focused on the above-mentioned problem, and an object of the present invention is to reliably prevent a fastening bolt that fastens a brake disc to a wheel from coming off.

In order to achieve the above object, in the first invention,
A donut-shaped disc-shaped plate portion with the sliding surface on the front side, and a bolt fastening device provided on the back side of the plate portion to which the tip of a fastening bolt inserted into the wheel-side bolt insertion hole of the wheel is fastened. The target is a pair of brake discs equipped with a fin part,
The bolt fastening fin part mentioned above is
a fin body provided at a position facing the wheel side bolt insertion hole;
a nut insertion notch provided in the fin body and allowing the nut to pass through to a position facing the wheel side bolt insertion hole;
a bolt insertion hole provided in the fin body and into which the tip of the fastening bolt is inserted;
a fastened part provided on the fin part main body, tightened by the fastening bolt, and pressed against the periphery of the wheel side bolt insertion hole;
The above-mentioned fastening bolt is a bolt with a hole,
A nut to which the tip of the fastening bolt is fastened is fitted into the bolt fastening fin portion provided on the plate portion in a non-rotating state.

According to the above configuration, the nut for fastening the tip of the fastening bolt only needs to be passed through the nut insertion notch in the fin main body to a position opposite to the wheel side bolt insertion hole. By devising the assembly procedure, it is not necessary to make a hole larger than the bolt head of the fastening bolt in order to insert the fastening bolt into the plate part. Therefore, even if the fastening bolt becomes loose, it will not come out through the tool insertion hole.

In the second invention, in the first invention,
Of the pair of brake discs, one of the donut-shaped plate portions is provided with a tool insertion hole for rotating and screwing the bolt head,
Of the pair of brake discs, the other donut-shaped disk-shaped plate portion is not provided with the tool insertion hole, and the fastening bolts on the other donut-shaped disk-shaped plate portion are Bolts without holes can be used instead.

According to the above configuration, since the other donut-shaped disk-shaped plate part is not provided with a tool insertion hole for rotating the bolt head, the fastening bolt may be a bolt with a hole, but No bolts may be used. In addition, since there is no need to provide a tool insertion hole, the effort of machining the tool insertion hole can be saved, and the area of the sliding surface increases due to the lack of a tool insertion hole, improving the braking effect and increasing durability. . In addition, wind noise is less likely to occur, and the nuts and fastening bolts do not come off.

In the third invention,
A donut-shaped disc-shaped plate portion with the sliding surface on the front side, and a bolt fastening device provided on the back side of the plate portion to which the tip of a fastening bolt inserted into the wheel-side bolt insertion hole of the wheel is fastened. The target is a pair of brake discs equipped with a fin part,
The bolt fastening fin part mentioned above is
a fin body provided at a position facing the wheel side bolt insertion hole;
a tap hole provided in the fin body and for fastening the tip of the fastening bolt;
a fastened part provided on the fin part main body, tightened by the fastening bolt, and pressed against the periphery of the wheel side bolt insertion hole;
The above-mentioned fastening bolt is a bolt with a hole,
The tip of the fastening bolt is fastened to the tap hole of the bolt fastening fin provided in the plate part.

According to the above configuration, the tap hole for fastening the tip of the fastening bolt can be formed in advance in the fin body, and by devising the assembly procedure of the pair of discs, the tap hole for fastening the tip of the fastening bolt can be formed in the plate part. There is no need to make a hole larger than the bolt head of the fastening bolt in order to insert the bolt. Therefore, even if the fastening bolt becomes loose, it will not come out through the tool insertion hole. Furthermore, since no nuts are used, there is no need to fit nuts.

In the fourth invention, in the third invention,
Of the pair of brake discs, one of the donut-shaped plate portions is provided with a tool insertion hole for rotating and screwing the bolt head,
Of the pair of brake discs, the other donut-shaped disc-shaped plate part is not provided with a tool insertion hole, and the fastening bolt on the other donut-shaped disc-shaped plate part is not provided with a hole. Can be replaced with a blank bolt.

According to the above configuration, since no tool insertion hole is provided in the other donut-shaped disk-shaped plate portion, the fastening bolt may be a bolt without a hole. Since there is no need for a tool insertion hole, the effort of machining the tool insertion hole can be saved, and the area of the sliding surface increases by the lack of a tool insertion hole, improving the braking effect and increasing durability. In addition, wind noise is less likely to occur, and nuts and bolts do not fall out. Furthermore, if a tapped hole is provided, a nut is not used, so there is no need to fit a nut into the hole.

In a fifth invention, in any one of the first to fourth inventions,
The bolt fastening fin portions provided on each of the pair of brake discs are configured to be disposed at circumferentially shifted positions when assembled to the wheel.

According to the above configuration, the structure is simplified by minimizing the number of fastening fins provided on each brake disc.

The sixth invention is directed to a method of fastening a first brake disc and a second brake disc to a wheel,
The above method is
The first brake disc, which is provided with a tool insertion hole for rotating and screwing in the bolt head of the second fastening bolt that fastens the second brake disc, is placed with the sliding surface side of the first brake disc facing downward. and place it on the mounting surface.
Fitting a first nut into a first nut insertion notch provided in a first bolt fastening fin portion of the first brake disc;
Install the necessary number of second fastening bolts to fasten the second brake disc at the position where the tool insertion hole of the first brake disc is located on the side opposite to the sliding surface of the first brake disc. Stand it upright with your head facing down,
placing the wheel on the first brake disc so that the wheel side bolt insertion hole of the wheel matches the position of the second fastening bolt;
A first fastening bolt is inserted into the wheel-side bolt insertion hole through which the second fastening bolt is not inserted from the side opposite to the first brake disc, and the tip of the first fastening bolt is fastened to the first bolt. fastening the first brake disc and the wheel by sequentially tightening the first nut of the fin part with a predetermined tightening torque;
Fitting a second nut into the second nut insertion notch of the second brake disc,
Fitting the second brake disc into which the second nut is fitted onto the wheel so that the second nut faces the second fastening bolt,
The tip of the second fastening bolt is sequentially tightened with a predetermined tightening torque to the second nut of the second bolt fastening fin portion using a tightening tool through the tool insertion hole of the first brake disc, and the second brake The disc and the wheel are fastened together.

A seventh invention is directed to a method of fastening a first brake disc and a second brake disc to a wheel,
The above method is
A first tapped hole for fastening the first fastening bolt is provided in advance in the first bolt fastening fin portion of the first brake disc, and
A second tapped hole for fastening the second fastening bolt is provided in advance in the second bolt fastening fin portion of the second brake disc,
A first brake disc provided with a tool insertion hole for rotating and screwing in the bolt head of the second fastening bolt is installed on the mounting surface with the sliding surface side of the first brake disc facing downward. ,
Install the necessary number of second fastening bolts to fasten the second brake disc at the position where the tool insertion hole of the first brake disc is located on the side opposite to the sliding surface of the first brake disc. Stand it upright with your head facing down,
placing the wheel on the first brake disc so that the wheel side bolt insertion hole of the wheel matches the position of the second fastening bolt;
Insert the first fastening bolt into the wheel-side bolt insertion hole through which the second fastening bolt has not been inserted from the side opposite to the first brake disc, and sequentially tighten the tips of the first fastening bolt to a predetermined value. fastening the first brake disc and the wheel by tightening the first bolt into the first tap hole of the first bolt fastening fin part with a specified torque;
Fitting the second brake disc into the wheel so that the second tap hole faces the second fastening bolt,
The tips of the second fastening bolts are sequentially tightened into the second tap holes with a predetermined tightening torque using a tightening tool through the tool insertion hole of the first brake disk to connect the second brake disk and the wheel. The structure shall be concluded.

According to these inventions, it is not necessary to make a hole larger than the bolt head of the fastening bolt in order to insert the fastening bolt into the plate portion. Therefore, even if the fastening bolt becomes loose, it will not come out through the tool insertion hole. In addition, if a tool insertion hole for rotating the bolt head is not provided in the plate part of one brake disc, the effort of machining the tool insertion hole can be saved, and the area of the sliding surface is made up by the lack of the tool insertion hole. increases, braking effectiveness improves, and durability also increases. In addition, wind noise is less likely to occur, and nuts and bolts do not fall out. Note that, compared to the case where a nut is provided, when a tapped hole is provided, the work for attaching a nut is not required, so the work is easier.

In the eighth invention,
A pair of brakes comprising a donut-shaped disk-shaped plate portion whose surface side is a sliding surface, and a bolt fastening fin portion provided on the back surface of the plate portion and surrounding a wheel-side bolt insertion hole of a wheel. Targeting disks,
The bolt fastening fin part mentioned above is
a fin body provided at a position facing the wheel side bolt insertion hole;
a bolt head insertion notch provided in the fin part main body and allowing the bolt head of a fastening bolt to be inserted into the wheel side bolt insertion hole to pass to a position opposite to the wheel side bolt insertion hole;
A nut with a hole provided on the fin main body and provided on the opposite side of the wheel side bolt insertion hole, and a fastened part that is tightened by the fastening bolt and comes into pressure contact with the periphery of the wheel side bolt insertion hole. Ori,
A tool insertion hole for rotating and screwing the holed nut is provided in the plate portion at a position where the holed nut is arranged.

According to the above configuration, the bolt head of the fastening bolt only needs to be passed through the bolt head insertion notch in the fin body to a position opposite to the wheel side bolt insertion hole, so the assembly procedure of the pair of discs is By devising this technique, there is no need to make a hole larger than the fastening bolt in order to insert the fastening bolt into the plate part. Therefore, even if the fastening bolt becomes loose, the fastening bolt or nut will not come out through the tool insertion hole.

The ninth invention is directed to a method of fastening a first brake disc and a second brake disc to a wheel,
The above method is
Place the first brake disc provided with a tool insertion hole for rotating and screwing in the second nut that fastens the second brake disc onto the mounting surface with the sliding surface side of the first brake disc facing down. installed,
Inserting the bolt head of the first fastening bolt into the first bolt head insertion notch provided in the first bolt fastening fin part of the first brake disc,
A number of second nuts necessary for fastening the second brake disc are inserted into the nut hole at a position on the side opposite to the sliding surface of the first brake disc where the tool insertion hole of the first brake disc is located. Place it face down,
placing the wheel on the first brake disc so that the wheel-side bolt insertion hole of the wheel matches the position of the second nut;
Fitting a first nut to the tip of the first fastening bolt,
Connecting the first brake disc and the wheel by sequentially tightening the first nuts to a predetermined tightening torque;
Inserting the bolt head of the second fastening bolt into the second bolt head insertion notch provided in the second bolt fastening fin part of the second brake disc,
Fitting the second brake disc into which the bolt head of the second fastening bolt is inserted into the wheel so that the second fastening bolt faces the second nut,
The second brake disc and the wheel are fastened together by sequentially tightening the second nut with a predetermined tightening torque using a tightening tool through the tool insertion hole of the first brake disc.

According to the above configuration, in order to insert the fastening bolt into the plate part, there is no need to make a hole larger than the bolt head of the fastening bolt. Therefore, even if the fastening bolt becomes loose, the fastening bolt or nut will not come out through the tool insertion hole. In addition, if a tool insertion hole for rotating the nut is not provided in the plate part of one brake disc, the effort of machining the tool insertion hole can be saved, and the area of the sliding surface can be reduced by the lack of the tool insertion hole. This increases the braking effect and increases durability. In addition, wind noise is less likely to occur, and nuts and bolts do not fall out.

As explained above, according to the present invention, there is no need to provide a through hole in the plate portion for inserting the fastening bolt, and it is possible to reliably prevent the fastening bolt from coming off.

FIG. 2B is an enlarged sectional view taken along the line IA-IA in FIG. 2B. It is an enlarged side view seen from the fin part side for second bolt fastening, with wheels omitted. It is an enlarged side view seen from the first bolt fastening fin part side with wheels omitted. FIG. 2 is a perspective view of a wheel to which a second brake disc according to Embodiment 1 of the present invention is fastened, viewed from the side opposite to the flange. FIG. 2 is a perspective view of a wheel to which a first brake disc according to Embodiment 1 of the present invention is fastened, viewed from the flange side. It is a perspective view which expands and shows the 1st or 2nd bolt fastening fin part and its surroundings. It is a perspective view which expands and shows a 1st bolt fastening fin part, a 1st fastening bolt, a 1st nut, and the surroundings. FIG. 3 is a rear view showing the back surface of the first brake disc according to Embodiment 1 of the present invention. FIG. 3 is a rear view showing the back surface of the second brake disc according to Embodiment 1 of the present invention. FIG. 3A is a perspective view corresponding to FIG. 3A according to a modification of Embodiment 1 of the present invention. FIG. 2 is an enlarged side view of the first and second brake discs according to the embodiment of the present invention, with wheels omitted and viewed from the first bolt fastening fin portion side. FIG. 2 is an enlarged side view of the first and second brake discs according to the embodiment of the present invention, with wheels omitted and viewed from the second bolt fastening fin portion side. It is a perspective view which expands and shows the 1st bolt fastening fin part and its surroundings. It is a perspective view which expands and shows a 2nd bolt fastening fin part and its surroundings. FIG. 7 is a rear view showing the back surface of the first brake disc according to Embodiment 2 of the present invention. FIG. 7 is a rear view showing the back surface of a second brake disc according to Embodiment 2 of the present invention.

Embodiment 1 of the present invention will be described below based on the drawings.

-Configuration of the first and second brake discs-
1A to 4B show a first brake disc 1 and a second brake disc 11 for a railway vehicle according to Embodiment 1 of the present invention. As shown in FIG. 1C, one of the first brake discs 1 is removably attached to one side of the front and back sides of the disc portion 20a of the wheel 20 of the railway vehicle by a first fastening bolt 21 and a first nut 22, As shown in FIGS. 1A and 1B, the other second brake disc 11 is removably attached to the front and back sides of the disc portion 20a using a second fastening bolt 31 and a second nut 32. The first brake disc 1 and the second brake disc 11 are made of cast steel, for example. The wheel 20 is provided with a flange portion 20b having a larger outer diameter than other portions. Here, the first brake disc 1 is fixed to the inner side of the flange portion 20b in the width direction of the railway vehicle. The second brake disc 11 is fixed to the outside in the width direction of the railway vehicle on the side opposite to 20b. Note that the first fastening bolt 21 and first nut 22 and the second fastening bolt 31 and second nut 32 may be fastened together with washers 23, 33 such as flat washers and spring washers. Conversely, the second brake disc 11 may be attached to the flange portion 20b side of the disc portion 20a.

As shown in FIGS. 2A and 2B, the first brake disc 1 and the second brake disc 11 have a donut-shaped plate shape with a circular opening in the center and a sliding surface on the front side (outer surface side). Each of the plate portions 1a and 11a is provided. In this embodiment, as shown in FIGS. 4A and 4B, a plurality of first bolt fastening fin parts 2 or second bolt fastening fin parts 2 are provided at intervals on the back surfaces (inner surfaces) of the plate parts 1a and 11a. The fin portions 12 are integrally provided in a protruding manner.

A total of six first bolt fastening fin parts 2 and six second bolt fastening fin parts 12 are provided on the first brake disc 1 and the second brake disc 11 at intervals of 60 degrees, respectively. The number of each fin portion is not necessarily limited to six, and may be more or less. Moreover, an auxiliary fin part may be integrally provided between the pair of first bolt fastening fin part 2 and second bolt fastening fin part 12. Furthermore, although not shown, rib portions extending in the circumferential direction that connect the first bolt fastening fin portion 2 or the second bolt fastening fin portion 12 to each other are provided on the back surfaces of the plate portions 1a and 11a, respectively. You can leave it there.

As shown in FIG. 3A, the first bolt fastening fin section 2 has a fin section main body 2a that protrudes from the back surface of the plate section 1a of the first brake disc 1, and a wheel of the wheel 20 is inserted into the fin section main body 2a. The first nut 22 is configured to be fastened to which the tip of the first fastening bolt 21 inserted into the side bolt insertion hole 20c is screwed. On the other hand, the second bolt fastening fin section 12 has a fin section main body 12a protruding from the back surface of the plate section 11a of the second brake disc 11, and a wheel side bolt insertion hole 20c of the wheel 20 is provided in the fin section main body 12a. A second nut 32, into which the tip of a second fastening bolt 31 inserted into the second fastening bolt 31 is screwed, is fastened.

As shown by arrows in FIG. 3A, the first nut 22 or the second nut 32 is slid along the back surface of the plate portions 1a, 11a to form the wheel side bolt insertion holes 20c in the fin portion main bodies 2a, 12a. A first nut insertion notch 2e or a second nut insertion notch 12e is formed to allow the bolt to pass through to the circular bolt insertion hole 2b, 12b formed at a position facing the. The fin main bodies 2a, 12a are also provided with fastened parts 2c, 12c which are flat surfaces that are tightened by the first nut 22 or the second nut 32 and come into pressure contact with the plate parts 1a, 11a.

As shown in FIGS. 1B and 1C, the first nut 22 and the second nut 32 each have a pair of flat surfaces 22a and 32a that come into contact with the pair of inner surfaces of the fin main bodies 2a and 12a, As a result, the first or second nuts 22, 32 inserted through the nut insertion notches 2e, 12e are fixed at appropriate positions on the fin main bodies 2a, 12a in a non-rotating state. Therefore, the tool insertion hole 2d for inserting a tool is not required on the first or second nut 22, 32 side.

As shown in FIGS. 1B and 1C, a first bolt fastening fin portion is provided on the bolt head side of the first fastening bolt 21 or the second fastening bolt 31 for fastening the first or second nut 22, 32. A fin portion such as the second or second bolt fastening fin portion 12 is not provided. For convenience of assembly, a tool insertion hole 2d for fastening the second fastening bolt 31 is provided only in one plate portion 1a. The inner diameter of the tool insertion hole 2d is smaller than the outer diameter of the bolt head 31a, and is large enough to allow insertion of a tool such as a hexagonal wrench that is fitted into the hexagonal hole of the second fastening bolt 31 made of a hexagonal socket bolt. Good to have. In this embodiment, as shown in FIGS. 2B and 4A, the tool insertion holes 2d are equally spaced apart from each other by 60 degrees. The arrangement position is at the center in the circumferential direction of the pair of first bolt fastening fin parts 2 and at a position opposite to the second bolt fastening fin part 12 of the second brake disc 11 when assembled to the wheel 20. It has become.

That is, when the first or second bolt fastening fin portions 2, 12 provided on the first and second brake discs 1, 11 are assembled to the wheel 20, the first or second bolt fastening fin portions 2, 12 are displaced in the circumferential direction in a plan view. placed in position. In this way, the number of fastening fin parts 2, 12 provided on each brake disc 1, 11 is minimized, so the structure is simplified.

In this way, as shown in FIG. 1A, the pair of first brake disc 1 and second brake disc 11 are inserted into the wheel side bolts while sandwiching the disc part 20a of the wheel 20 from both sides in the thickness direction. The tip of the first fastening bolt 21 inserted into the hole 20c is fastened to the first nut 22, and the tip of the second fastening bolt 31 is fastened to the second nut 32, thereby being removably fixed to the wheel 20. It looks like this.

-How to fasten the first and second brake discs-
Next, a method of actually fastening the first brake disc 1 and the second brake disc 11 to the wheel 20 will be explained.

First, the first brake disc 1 is placed on a mounting surface such as the ground with its sliding surface facing downward.

Next, as shown in FIG. 3A, the first nuts are inserted into the first nut insertion notches 2e of all the first bolt fastening fin parts 2 of the first brake disc 1 in the direction of the arrow along the back surface of the plate part 1a. Insert 22. At this time, a washer 23 having the same shape in plan view may be inserted. As shown in FIG. 1C, if the pair of flat surfaces 22a of the first nut 22 are inserted into the pair of side surfaces of the bolt fastening fin portion 2, the first nut 22 is prevented from rotating.

Next, in order to fasten the second brake disc 11, as shown in FIG. The bolt head 31a is erected at a position facing the second bolt fastening fin portion 12 with the bolt head 31a facing down as shown by the two-dot chain line in FIG. 1B. This position corresponds to the position where the tool insertion hole 2d is provided. At this time, a counterbore or a groove for positioning may be provided in the first brake disc 1 so that the second fastening bolt 31 does not move.

Next, the wheel 20 is placed on the first brake disc 1 with the flange portion 20b side facing down. At this time, slowly lower the second fastening bolt 31 so that the wheel-side bolt insertion hole 20c matches the tip of the second fastening bolt 31.

Next, for example, a total of six first fastening bolts 21 are inserted from the side opposite to the first brake disc 1 (from above) into the wheel-side bolt insertion holes 20c through which the second fastening bolts 31 are not inserted, and When the first fastening bolts 21 are sequentially tightened to the first nut 22 with a predetermined tightening torque, the first brake disc 1 and the wheel 20 are in a fastened state as shown in FIG. 1C.

Next, as shown in FIG. 3A, the second nut 32 is fitted into the nut insertion notch 12e of the second brake disc 11 in the direction of the arrow and along the back surface of the plate portion 11a.

Next, the second brake disc 11 with the second nut 32 fitted therein is fitted into the disc portion 20a of the wheel 20. At this time, slowly lower the second fastening bolt 31 so that the tip thereof is located at the second nut 32 (bolt insertion hole 2b).

Finally, with the wheel 20 sandwiched between the first and second brake discs 1 and 11, turn it inside out or without turning it over, insert the tool insertion hole of the first brake disc 1 from the first brake disc 1 side. When the second fastening bolts 31 are sequentially tightened to the second nut 32 with a predetermined tightening torque using a tightening tool such as a hexagonal wrench inserted into the second brake disc 2d, as shown in FIGS. 1A and 1B, the second brake disc 11 and the wheel 20 are now in a fastened state.

As described above, in this embodiment, the first and second fastening bolts 21 and 31 do not need to be inserted from the brake disc sliding surface side along the fastening direction (screwing direction), so the tool insertion holes 2d The first fastening bolt 21 may be of a size that can be fastened by inserting a hexagonal wrench or the like into the hexagonal hole provided in the bolt head 21a of the first fastening bolt 21. Therefore, even if the first fastening bolt 21 becomes loose, the first fastening bolt 21 will not come out through the wheel-side bolt insertion hole 20c.

Furthermore, the tool insertion hole 2d for rotating the bolt head 21a is not required on the plate portion 11a side of the second brake disc 11. Therefore, it is possible to save the effort of machining the tool insertion hole 2d, and the area of the sliding surface increases due to the absence of the hole, thereby improving the braking effect and increasing durability. In addition, wind noise is less likely to occur, and the second fastening bolt 31 does not come off.

Therefore, in this embodiment, there is no need to provide through holes in the plate parts 1a, 11a for inserting the first and second fastening bolts 21, 31, and the first and second fastening bolts 21, 31 can be pulled out. can be reliably prevented.

-Modified example-
FIG. 5 shows a modification of Embodiment 1 of the present invention, which differs from Embodiment 1 above in that tap holes 2b' and 12b' are provided instead of nuts 22 and 32. In addition, in the following modified example and Embodiment 2, the same parts as in FIGS. 1A to 4B are given the same reference numerals, and detailed explanation thereof will be omitted.

In this modification, the bolt insertion holes of the first bolt fastening fin part 2' and the second bolt fastening fin part 12' are not through holes but are formed of tapped tapped holes 2b' and 12b'. There is. In this modification, as shown in FIG. 5, the nuts 22, 32 are not used, so the nut insertion notches 2e, 12e are not necessary, and the fin main bodies 2a', 12a' may be solid. This tap is provided in advance during or after molding the first and second brake discs 1' and 11'.

First, as in the first embodiment, in order to fasten the second brake disc 11', a required number of second fastening bolts 31 are inserted into the second fastening bolts 31 on the side opposite to the sliding surface of the first brake disc 1'. The brake disc 11' is erected at a position facing the second bolt fastening fin portion 12' with the bolt head 31a facing down.

Next, the wheel 20 is placed on the first brake disc 1' with the flange portion 20b side facing down. At this time, slowly lower the second fastening bolt 31 so that the wheel-side bolt insertion hole 20c matches the tip of the second fastening bolt 31.

Next, the first fastening bolt 21 is inserted from the side opposite to the first brake disc 1' (from above) into the wheel-side bolt insertion hole 20c through which the second fastening bolt 31 is not inserted, and the first fastening bolt 21 is 21 is sequentially tightened into the tap hole 2b' with a predetermined tightening torque, the first brake disc 1' and the wheel 20 are brought into a fastened state as in the first embodiment.

Next, the second brake disc 11' is fitted into the disk portion 20a of the wheel 20. At this time, slowly lower the second fastening bolt 31 so that the tip thereof is located at the tapped hole 12b'.

Finally, while keeping the wheel 20 sandwiched between the first and second brake discs 1' and 11', turn it inside out or without turning it over, apply the first brake disc 1' from the first brake disc 1' side. When the second fastening bolt 31 is sequentially tightened into the tapped hole 12b' with a predetermined tightening torque using a tightening tool such as a hex wrench inserted into the tool insertion hole 2d, the second The brake disc 11' and the wheel 20 are now in a fastened state.

Therefore, in this modification, there is no need to attach the nuts 22, 32 compared to the first embodiment, and the first and second fastening bolts 21, 31 are easily prevented from coming off with a simpler structure. be able to.

(Embodiment 2)
-Configuration of the first and second brake discs-
6A to 8B show first and second brake discs 101 and 111 according to Embodiment 2 of the present invention, which differs from Embodiment 1 in that the bolt head side is inserted into the bolt fastening fin portion.

As shown in FIG. 6A, one of the first brake discs 101 is removably attached to one side of the front and back sides of the disc portion 20a of the wheel 20 of the railway vehicle by a first fastening bolt 121 and a first nut 122, As shown in FIG. 6B, the other second brake disc 111 is removably attached to the other side of the front and back sides of the disc portion 20a using a second fastening bolt 131 and a second nut 132. The first brake disc 101 and the second brake disc 111 are made of cast steel, for example. The wheel 20 is provided with a flange portion 20b having a larger outer diameter than other portions. Here, the first brake disc 101 is fixed to the inner side of the flange portion 20b in the width direction of the railway vehicle. A second brake disc 111 is fixed to the outside in the width direction of the railway vehicle on the opposite side to 20b.

In this embodiment, as shown in FIGS. 8A and 8B, on the back surfaces (inner surfaces) of the plate portions 101a and 111a, a plurality of first bolt fastening fin portions 102 or second bolt fastening fin portions are provided at intervals. The fin portions 112 are integrally provided in a protruding manner.

The first brake disc 101 and the second brake disc 111 are provided with a total of six first bolt fastening fin parts 102 and second bolt fastening fin parts 112 spaced apart by 60 degrees, respectively. The number of each fin portion is not necessarily limited to six, and may be more or less. Moreover, an auxiliary fin part may be integrally provided between the pair of first bolt fastening fin part 102 and second bolt fastening fin part 112. Further, although not shown, rib portions extending in the circumferential direction that connect the first bolt fastening fin portion 102 or the second bolt fastening fin portion 112 to each other are provided on the back surfaces of the plate portions 101a and 111a, respectively. You can leave it there.

As shown in FIG. 7A, the first bolt fastening fin part 102 has a fin part main body 102a that protrudes from the back surface of the plate part 101a of the first brake disc 101, and the fin part main body 102a has a wheel 20 mounted therein. The bolt head 121a of the first fastening bolt 121 is inserted into the side bolt insertion hole 20c. On the other hand, as shown in FIG. 7B, the second bolt fastening fin section 112 has a fin section main body 112a that protrudes from the back surface of the plate section 111a of the second brake disc 111, and the wheel 20 is mounted inside the fin section main body 112a. The bolt head 131a of the second fastening bolt 131 is inserted into the wheel side bolt insertion hole 20c.

As shown by arrows in FIGS. 7A and 7B, the bolt heads 121a, 131a are inserted into the wheel-side bolt insertion holes 20c in the fin main bodies 102a, 112a by sliding them along the back surfaces of the plate parts 101a, 111a. A first bolt head insertion notch 102e or a second bolt head insertion notch 112e is formed to allow the bolt to pass through to the opposing position. The fin main bodies 102a, 112a are also provided with fastened parts 102c, 112c which are flat surfaces that are tightened by the first fastening bolt 121 or the second fastening bolt 131 and come into pressure contact with the plate parts 101a, 111a. Since there is no need to fasten the bolt heads 121a and 131a, there is no need for a tool insertion hole 2d for inserting a tool.

As shown in FIGS. 6A and 6B, the first or second nut 122, 132 to which the first fastening bolt 121 or the second fastening bolt 131 is fastened has a first bolt fastening fin portion 102 or a A fin portion such as the two-bolt fastening fin portion 112 is not provided. For convenience of assembly, a tool insertion hole 2d for fastening the second nut 132 is provided only in one plate portion 101a. The inner diameter of this tool insertion hole 2d is smaller than the outer diameter of the second nut 132, and is large enough to allow insertion of a tool such as a hexagonal wrench that is fitted into the hexagonal hole of the second nut 132, which is made of a hexagonal nut. Bye. In this embodiment, as shown in FIG. 8A, the tool insertion holes 2d are equally spaced apart from each other by 60 degrees. The arrangement position is at the center in the circumferential direction of the pair of first bolt fastening fin parts 102 and at a position opposite to the second bolt fastening fin part 112 of the second brake disc 111 when assembled to the wheel 20. It has become.

That is, when the first or second bolt fastening fin portions 102, 112 provided on the first and second brake discs 101, 111 are assembled to the wheel 20, the first or second bolt fastening fin portions 102, 112 are displaced in the circumferential direction in a plan view. placed in position. In this way, since the number of fastening fin portions 102, 112 provided on each brake disc 101, 111 is minimized, the structure is simplified.

In this way, as shown in FIGS. 6A and 6B, the pair of first brake disc 101 and second brake disc 111 sandwich the disc part 20a of the wheel 20 from both sides in the thickness direction, and then press the disc part 20a between the wheels. By fastening the tip of the first fastening bolt 121 inserted into the side bolt insertion hole 20c to the first nut 122, and fastening the tip of the second fastening bolt 131 to the second nut 132, it can be detached from the wheel 20. It is set to be fixed.

-How to fasten the first and second brake discs-
Next, a method of actually fastening the first brake disc 101 and the second brake disc 111 to the wheel 20 will be explained.

First, the first brake disc 101 is placed on a mounting surface such as the ground with its sliding surface facing downward.

Next, as shown in FIG. 7A, first bolts are inserted into the first bolt head insertion notches 102e of all the first bolt fastening fin parts 102 of the first brake disc 101 in the direction of the arrow along the back surface of the plate part 101a. The bolt head 121a of the fastening bolt 121 is fitted. At this time, a washer 23 having the same shape in plan view may be inserted. The bolt head 121a is prevented from rotating within the first bolt fastening fin portion 102.

Next, in order to fasten the second brake disc 111, as shown in FIG. It is placed in a position facing the bolt fastening fin portion 112 with the nut hole facing down as shown by the two-dot chain line in FIG. 6B. This position corresponds to the position where the tool insertion hole 2d is provided. At this time, a counterbore or a groove for positioning may be provided in the first brake disc 101 so that the second nut 132 does not move.

Next, the wheel 20 is placed on the first brake disc 101 with the flange portion 20b side facing down. At this time, slowly lower the first fastening bolt 121 so that the wheel-side bolt insertion hole 20c matches the tip of the first fastening bolt 121.

Next, when the first nuts 122 are sequentially tightened to the tips of the first fastening bolts 121 from the side opposite to the first brake disc 101 (from above) with a predetermined tightening torque, as shown in FIG. 6A, the first brake disc 101 and the wheel 20 are now in a fastened state.

Next, as shown in FIG. 7B, the bolt head of the second fastening bolt 131 is inserted into the bolt head insertion notch 112e of the second brake disc 111 in the direction of the arrow and along the back surface of the plate portion 111a. Insert 131a.

Next, the second brake disc 111 into which the second fastening bolt 131 is fitted is fitted into the disc portion 20a of the wheel 20. At this time, the second fastening bolt 131 is slowly lowered so that its tip is positioned at the second nut 132.

Finally, while keeping the wheel 20 sandwiched between the first and second brake discs 101 and 111, turn it inside out or without turning it over, insert the tool insertion hole of the first brake disc 101 from the first brake disc 101 side. When the second nut 132 is sequentially tightened to the second fastening bolt 131 with a predetermined tightening torque using a tightening tool such as a hex wrench inserted through the hole 2d, the second brake disc 111 and the wheel are tightened as shown in FIG. 6B. 20 is now in a fastened state.

As described above, in this embodiment, the first and second fastening bolts 121 and 131 do not need to be inserted from the brake disc sliding surface side along the fastening direction (screwing direction), so the tool insertion holes 2d The second nut 132 may be of a size that can be fastened by inserting a hexagonal wrench or the like into the hexagonal hole provided in the second nut 132. Therefore, even if the first nut 122 becomes loose, the first nut 122 and the first fastening bolt 121 will not come out through the wheel-side bolt insertion hole 20c.

Furthermore, the tool insertion hole 2d for rotating the first nut 122 is not required on the plate portion 111a side of the second brake disc 111. Therefore, it is possible to save the effort of machining the tool insertion hole 2d, and the area of the sliding surface increases due to the absence of the hole, thereby improving the braking effect and increasing durability. In addition, wind noise is less likely to occur, and the first nut 122 and first fastening bolt 121 do not come off.

Therefore, in this embodiment, there is no need to provide through holes in the plate parts 101a, 111a for inserting the first and second fastening bolts 121, 131, and the first and second fastening bolts 121, 131 can be removed. can be reliably prevented.

(Other embodiments)
The present invention may have the following configuration for the above embodiment.

That is, in the first embodiment, an example of a hexagonal socket bolt is shown as the first and second fastening bolts 21 and 31, but the invention is not limited to this, and for example, the first and second fastening bolts 21 and 31 The holes provided in the bolt heads 21a, 31a are not limited to hexagonal holes, but may have other shapes such as triangular or quadrangular. Further, the fastening bolt 21 may be a countersunk screw or a hexagonal bolt.

In the first and second embodiments described above, the first brake discs 1, 1', 101 are provided with the tool insertion holes 2d, and the second brake discs 11, 11', 111 are provided with the tool insertion holes 2d. However, the tool insertion hole 2d may also be provided on the second brake disc 11, 11', 111 side.

In the first embodiment, the fastening bolt 21 and the fastening bolt 31 are all hexagon socket bolts, but the fastening bolt 21 on the side that does not have the tool insertion hole 2d does not need to be a socket bolt. A normal bolt with a hexagonal bolt head without a hole may also be used. Similarly, in the second embodiment, the first nut 122 and the second nut 132 are all nuts with a hole, but the first nut 122 on the side that does not have the tool insertion hole 2d is not a nut with a hole. A normal hexagonal nut without a hole may also be used.

Note that the above embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its applications, or uses.

1,1' 1st brake disc
1a, 11a plate part
2,2' Fin part for fastening the first bolt
2a, 12a Fin part main body
2a', 12a' Fin body
2b, 12b Hole for bolt insertion
2b', 12b' tap hole
2c, 12c Fastened part
2d Tool insertion hole
2e, 12e Notch for nut insertion
11,11' 2nd brake disc
12, 12' Fin part for second bolt fastening
20 wheels
20a Disc part
20b flange part
20c Wheel side bolt insertion hole
21 First fastening bolt
21a, 31a bolt head
22, 32 nut
22a, 32a flat surface
23, 33 Washer
31 Second fastening bolt 101 First brake disc 111 Second brake disc 101a, 111a Plate part 102 First bolt fastening fin part 112 Second bolt fastening fin part 102a, 112a Fin part main body 102c, 112c Fastened part 102d Tool insertion hole 102e First bolt head insertion notch 112e Second bolt head insertion notch 121 First fastening bolt 121a, 131a Bolt head 122, 123 Nut 131 Second fastening bolt 132 Second nut

Claims (8)

A donut-shaped disc-shaped plate portion with the sliding surface on the front side, and a bolt fastening device provided on the back side of the plate portion to which the tip of a fastening bolt inserted into the wheel-side bolt insertion hole of the wheel is fastened. A pair of brake discs comprising a fin portion,
The bolt fastening fin part mentioned above is
a fin body provided at a position facing the wheel side bolt insertion hole;
a nut insertion notch provided in the fin body and allowing the nut to pass through to a position facing the wheel side bolt insertion hole;
a bolt insertion hole provided in the fin body and into which the tip of the fastening bolt is inserted;
a fastened part provided on the fin part main body, tightened by the fastening bolt, and pressed against the periphery of the wheel side bolt insertion hole;
The above-mentioned fastening bolt is a bolt with a hole,
A nut to which the tip of the fastening bolt is fastened is fitted into the bolt fastening fin part provided on the plate part in a non-rotating state,
A brake characterized in that the bolt fastening fin portions provided on each of the pair of brake discs are configured to be disposed at circumferentially offset positions when assembled to the wheel. disk. The brake disc according to claim 1,
Of the pair of brake discs, one of the donut-shaped plate portions is provided with a tool insertion hole for rotating and screwing the bolt head,
Of the pair of brake discs, the other donut-shaped disk-shaped plate portion is not provided with the tool insertion hole, and the fastening bolts on the other donut-shaped disk-shaped plate portion are A brake disc characterized by the fact that it can be replaced with bolts without holes. A donut-shaped disc-shaped plate portion with the sliding surface on the front side, and a bolt fastening device provided on the back side of the plate portion to which the tip of a fastening bolt inserted into the wheel-side bolt insertion hole of the wheel is fastened. A pair of brake discs comprising a fin portion,
The bolt fastening fin part mentioned above is
a fin body provided at a position facing the wheel side bolt insertion hole;
a tap hole provided in the fin body and for fastening the tip of the fastening bolt;
a fastened part provided on the fin part main body, tightened by the fastening bolt, and pressed against the periphery of the wheel side bolt insertion hole;
The above-mentioned fastening bolt is a bolt with a hole,
The tip of the fastening bolt is fastened to the tapped hole of the bolt fastening fin provided in the plate part ,
The bolt fastening fin portions provided on each of the pair of brake discs are configured to be disposed at circumferentially shifted positions when assembled to the wheel.
A brake disc characterized by: The brake disc according to claim 3,
Of the pair of brake discs, one of the donut-shaped plate portions is provided with a tool insertion hole for rotating and screwing the bolt head,
Of the pair of brake discs, the other donut-shaped disk-shaped plate portion is not provided with the tool insertion hole, and the fastening bolts on the other donut-shaped disk-shaped plate portion are A brake disc characterized by the fact that it can be replaced with bolts without holes. A method of fastening a first brake disc and a second brake disc to a wheel, the method comprising:
The first brake disc, which is provided with a tool insertion hole for rotating and screwing in the bolt head of the second fastening bolt that fastens the second brake disc, is placed with the sliding surface side of the first brake disc facing downward. and place it on the mounting surface.
Fitting a first nut into a first nut insertion notch provided in a first bolt fastening fin portion of the first brake disc;
Install the necessary number of second fastening bolts to fasten the second brake disc at the position where the tool insertion hole of the first brake disc is located on the side opposite to the sliding surface of the first brake disc. Stand it upright with your head facing down,
placing the wheel on the first brake disc so that the wheel side bolt insertion hole of the wheel matches the position of the second fastening bolt;
A first fastening bolt is inserted into the wheel-side bolt insertion hole through which the second fastening bolt is not inserted from the side opposite to the first brake disc, and the tip of the first fastening bolt is fastened to the first bolt. fastening the first brake disc and the wheel by sequentially tightening the first nut of the fin part with a predetermined tightening torque;
Fitting a second nut into the second nut insertion notch of the second brake disc,
Fitting the second brake disc into which the second nut is fitted onto the wheel so that the second nut faces the second fastening bolt,
The tip of the second fastening bolt is sequentially tightened with a predetermined tightening torque to the second nut of the second bolt fastening fin portion using a tightening tool through the tool insertion hole of the first brake disc, and the second brake A method for fastening a brake disc, the method comprising fastening a disc and the wheel. A method of fastening a first brake disc and a second brake disc to a wheel, the method comprising:
A first tapped hole for fastening the first fastening bolt is provided in advance in the first bolt fastening fin portion of the first brake disc, and
A second tapped hole for fastening the second fastening bolt is provided in advance in the second bolt fastening fin portion of the second brake disc,
A first brake disc provided with a tool insertion hole for rotating and screwing in the bolt head of the second fastening bolt is installed on the mounting surface with the sliding surface side of the first brake disc facing downward. ,
Install the necessary number of second fastening bolts to fasten the second brake disc at the position where the tool insertion hole of the first brake disc is located on the side opposite to the sliding surface of the first brake disc. Stand it upright with your head facing down,
placing the wheel on the first brake disc so that the wheel-side bolt insertion hole of the wheel matches the position of the second fastening bolt;
Insert the first fastening bolt into the wheel-side bolt insertion hole through which the second fastening bolt has not been inserted from the side opposite to the first brake disc, and sequentially tighten the tips of the first fastening bolt to a predetermined value. fastening the first brake disc and the wheel by tightening the first bolt into the first tap hole of the first bolt fastening fin part with a given torque;
Fitting the second brake disc into the wheel so that the second tap hole faces the second fastening bolt,
The tips of the second fastening bolts are sequentially tightened into the second tapped hole with a predetermined tightening torque using a tightening tool through the tool insertion hole of the first brake disk to connect the second brake disk and the wheel. A brake disc fastening method characterized by fastening the brake disc. A pair of brakes comprising a donut-shaped disk-shaped plate portion whose surface side is a sliding surface, and a bolt fastening fin portion provided on the back surface of the plate portion and surrounding a wheel-side bolt insertion hole of a wheel. A disc,
The bolt fastening fin part mentioned above is
a fin body provided at a position facing the wheel side bolt insertion hole;
a bolt head insertion notch provided in the fin part main body and allowing the bolt head of a fastening bolt to be inserted into the wheel side bolt insertion hole to pass to a position opposite to the wheel side bolt insertion hole;
A nut with a hole provided on the fin main body and provided on the opposite side of the wheel side bolt insertion hole, and a fastened part that is tightened by the fastening bolt and comes into pressure contact with the periphery of the wheel side bolt insertion hole. Ori,
A brake disc characterized in that the plate portion at a position where the holed nut is arranged is provided with a tool insertion hole for rotating and screwing the holed nut. A method of fastening a first brake disc and a second brake disc to a wheel, the method comprising:
Place the first brake disc provided with a tool insertion hole for rotating and screwing in the second nut that fastens the second brake disc onto the mounting surface with the sliding surface side of the first brake disc facing down. installed,
Inserting the bolt head of the first fastening bolt into the first bolt head insertion notch provided in the first bolt fastening fin part of the first brake disc,
A number of second nuts necessary for fastening the second brake disc are inserted into the nut hole at a position on the side opposite to the sliding surface of the first brake disc where the tool insertion hole of the first brake disc is located. Place it face down,
placing the wheel on the first brake disc so that the wheel-side bolt insertion hole of the wheel matches the position of the second nut;
Fitting a first nut to the tip of the first fastening bolt,
Connecting the first brake disc and the wheel by sequentially tightening the first nuts to a predetermined tightening torque;
Inserting the bolt head of the second fastening bolt into the second bolt head insertion notch provided in the second bolt fastening fin part of the second brake disc,
Fitting the second brake disc into which the bolt head of the second fastening bolt is inserted into the wheel so that the second fastening bolt faces the second nut,
The second brake disc is fastened to the wheel by sequentially tightening the second nut with a predetermined tightening torque using a tightening tool through the tool insertion hole of the first brake disc. Fastening method.

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