JP2021148222A - Brake disc and fastening method thereof - Google Patents

Abstract

To reliably prevent the come-off of a fastening bolt for fastening a break disc to a wheel.SOLUTION: A fin part main body 2a provided in a position opposing a wheel-side bolt insertion hole 20c is provided at a bolt fastening fin part 2 of a first brake disc 1. A nut insertion notched part 2e for making a nut 22 pass up to the position opposing the wheel-side bolt insertion hole 20c by sliding the nut along a rear surface of a plate part 1a, and a fastened part 2c fastened to a fastening bolt 21, and brought into pressure contact with a peripheral edge of the wheel-side bolt insertion hole 20c are provided at a rear surface of the fin part main body 2a. The fastening bolt 21 is formed as a holed bolt, and the nut 22 to which a tip of the fastening bolt 21 is fastened is fit into the bolt fastening fin part 2 provided at the plate part 1a in a whirl-stop state.SELECTED DRAWING: Figure 1A

Description

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

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 first invention,
A donut-shaped disc-shaped plate with the front surface as the sliding surface, and a bolt fastening provided on the back surface of the plate to fasten the tip of a fastening bolt that is inserted into the wheel side bolt insertion hole of the wheel. For a pair of brake discs with fins
The above bolt fastening fins
The fin body provided at a position facing the wheel side bolt insertion hole and
A notch for inserting a nut, which is provided on the main body of the fin and allows the nut to pass to a position facing the bolt insertion hole on the wheel side.
A bolt insertion hole provided in the fin body and through which the tip of the fastening bolt is inserted,
It is provided on the fin portion main body, is fastened to the fastening bolt, and is provided with a fastened portion that is pressed against the peripheral edge of the wheel side bolt insertion hole.
The above fastening bolt is a bolt with a hole.
A nut for fastening the tip of the fastening bolt is fitted into the bolt fastening fin portion provided on the plate portion in a derotated state.

According to the above configuration, the nut for fastening the tip of the fastening bolt may be passed through the nut insertion notch of the fin portion body to a position facing 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 through the plate portion. Therefore, even if the fastening bolt is loosened, the fastening bolt will not pass through the tool insertion hole and come out.

In the second invention, in the first invention,
Of the pair of brake discs, one of the donut-shaped disc-shaped plates 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 portion is not provided with the tool insertion hole, and the fastening bolt on the other donut-shaped disc-shaped plate portion side is A non-hole bolt can be used as a substitute.

According to the above configuration, the other donut-shaped disc-shaped plate portion is not provided with a tool insertion hole for rotating the bolt head, so the fastening bolt may be a perforated bolt, but a hole. No bolt may be used. Since it is not necessary to provide the tool insertion hole, it is possible to save the trouble of machining the tool insertion hole, and the area of the sliding surface is increased due to the absence of the tool insertion hole, the braking effect is improved, and the durability is also improved. .. In addition, wind noise is less likely to occur, and nuts and fastening bolts do not come off.

In the third invention,
A donut-shaped disc-shaped plate with the front surface as the sliding surface, and a bolt fastening provided on the back surface of the plate to fasten the tip of a fastening bolt that is inserted into the wheel side bolt insertion hole of the wheel. For a pair of brake discs with fins
The above bolt fastening fins
The fin body provided at a position facing the wheel side bolt insertion hole and
A tap hole provided in the fin body and for fastening the tip of the fastening bolt,
It is provided on the fin portion main body, is fastened to the fastening bolt, and is provided with a fastened portion that is pressed against the peripheral edge of the wheel side bolt insertion hole.
The above 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 portion provided in the plate portion.

According to the above configuration, the tap hole for fastening the tip of the fastening bolt may be formed in advance in the fin portion main body, and by devising the assembly procedure of the pair of discs, the tap hole for fastening to the plate portion can be formed. It is not necessary 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 is loosened, the fastening bolt will not pass through the tool insertion hole and come out. Further, since no nut is used, there is no need to insert the nut.

In the fourth invention, in the third invention,
Of the pair of brake discs, one of the donut-shaped disc-shaped plates 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 portion is not provided with a tool insertion hole, and the fastening bolt on the other donut-shaped disc-shaped plate portion side is a hole. None bolts can be used instead.

According to the above configuration, since the other donut-shaped disc-shaped plate portion is not provided with the tool insertion hole, the fastening bolt may be a bolt without a hole. Since the tool insertion hole is not required, the labor of machining the tool insertion hole can be saved, and the area of the sliding surface is increased by the absence of the tool insertion 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. Further, if the tap hole is provided, the nut is not used, so that the work of fitting the nut is not required.

In the fifth invention, in any one of the first to fourth inventions,
The bolt fastening fin portions provided on the pair of brake discs are configured to be arranged at positions deviated from each other in the circumferential direction while being assembled to the wheels.

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

The sixth invention covers a method of fastening the first brake disc and the second brake disc to the wheel.
The above method
The first brake disc provided with the tool insertion hole for rotating and screwing the bolt head of the second fastening bolt for fastening the second brake disc is directed downward with the sliding surface side of the first brake disc facing downward. Installed on the mounting surface
Fit the first nut into the notch for inserting the first nut provided in the fin for fastening the first bolt of the first brake disc.
The number of second fastening bolts required to fasten the second brake disc is bolted on the side surface opposite to the sliding surface of the first brake disc at the position where the tool insertion hole of the first brake disc is located. Stand with your head down,
The wheel is placed on the first brake disc so that the wheel-side bolt insertion hole of the wheel is aligned with the position of the second fastening bolt.
Insert the first fastening bolt from the side opposite to the first brake disc into the wheel side bolt insertion hole into which the second fastening bolt is not inserted, and fasten the tip of the first fastening bolt to the first bolt. Sequentially tighten the first nut of the fin portion with a predetermined tightening torque to fasten the first brake disc and the wheel.
Insert the second nut into the notch for inserting the second nut of the second brake disc.
The second brake disc into which the second nut is fitted is fitted into the wheel so that the second nut faces the second fastening bolt.
The tip of the second fastening bolt is sequentially tightened to the second nut of the fin portion for fastening the second bolt with a tightening tool through the tool insertion hole of the first brake disc with a predetermined tightening torque. The disc and the wheels are fastened together.

A seventh invention covers a method of fastening a first brake disc and a second brake disc to a wheel.
The above method
A first tap hole for fastening the first fastening bolt is provided in advance in the first bolt fastening fin portion of the first brake disc, and the first tap hole is provided.
A second tap 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 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. ,
The number of second fastening bolts required to fasten the second brake disc is bolted on the side surface opposite to the sliding surface of the first brake disc at the position where the tool insertion hole of the first brake disc is located. Stand with your head down,
The wheel is placed on the first brake disc so that the wheel-side bolt insertion hole of the wheel is aligned with the position of the second fastening bolt.
The first fastening bolt is inserted into the wheel-side bolt insertion hole into which the second fastening bolt is not inserted from the side opposite to the first brake disc, and the tips of the first fastening bolts are sequentially tightened to a predetermined position. Tighten the first tap hole of the first bolt fastening fin portion with an attached torque to fasten the first brake disc and the wheel.
The second brake disc is fitted into the wheel so that the second tap hole faces the second fastening bolt.
The tip of the second fastening bolt is sequentially tightened to the second tap hole with a predetermined tightening torque by a tightening tool through the tool insertion hole of the first brake disc to tighten the second brake disc and the wheel. It shall be configured to be fastened.

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 through the plate portion. Therefore, even if the fastening bolt is loosened, the fastening bolt will not pass through the tool insertion hole and come out. Further, when the plate portion of one of the brake discs is not provided with a tool insertion hole for rotating the bolt head, it is possible to save the trouble of machining the tool insertion hole and the area of the sliding surface due to the absence of the tool insertion 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 addition, when the tap hole is provided as compared with the case where the nut is provided, the work of attaching the nut becomes unnecessary, so that the work becomes easier.

In the eighth invention,
A pair of brakes including a donut-shaped disc-shaped plate portion having a sliding surface on the front surface side and a bolt fastening fin portion provided on the back surface of the plate portion and surrounding the wheel side bolt insertion hole of the wheel. For discs
The above bolt fastening fins
The fin body provided at a position facing the wheel side bolt insertion hole and
A notch for inserting a bolt head provided in the fin body and passing the bolt head of a fastening bolt inserted into the wheel-side bolt insertion hole to a position facing the wheel-side bolt insertion hole.
It is provided with a nut with a hole provided on the main body of the fin portion and provided on the opposite side of the wheel-side bolt insertion hole, and a portion to be fastened to the peripheral edge of the wheel-side bolt insertion hole, which is fastened to the fastening bolt. Ori,
The plate portion at the position where the perforated nut is arranged is provided with a tool insertion hole for rotating and screwing the perforated nut.

According to the above configuration, the bolt head of the fastening bolt may be passed through the bolt head insertion notch of the fin portion body to a position facing the wheel side bolt insertion hole. By devising, it is not necessary to make a hole larger than 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 or nut will not pass through the tool insertion hole and come out.

In the ninth invention, a method of fastening the first brake disc and the second brake disc to the wheel is targeted.
The above method
A first brake disc provided with a tool insertion hole for rotating and screwing a second nut for fastening the second brake disc is placed on a mounting surface with the sliding surface side of the first brake disc facing downward. Install and
Insert the bolt head of the first fastening bolt into the notch for inserting the first bolt head provided in the fin portion for fastening the first bolt of the first brake disc.
The number of second nuts required to fasten the second brake disc is on the side surface opposite to the sliding surface of the first brake disc, at the position where the tool insertion hole of the first brake disc is located. Place it so that it is on the bottom
The wheel is placed on the first brake disc so that the wheel-side bolt insertion hole of the wheel is aligned with the position of the second nut.
Fit the first nut to the tip of the first fastening bolt,
The first nut is sequentially tightened with a predetermined tightening torque to fasten the first brake disc and the wheel.
Insert the bolt head of the second fastening bolt into the notch for inserting the second bolt head provided in the second bolt fastening fin portion of the second brake disc.
The second brake disc into which the bolt head of the second fastening bolt is inserted is fitted into the wheel so that the second fastening bolt faces the second nut.
The second nut is sequentially tightened with a tightening tool through the tool insertion hole of the first brake disc with a predetermined tightening torque to fasten the second brake disc and the wheel.

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 or nut will not pass through the tool insertion hole and come out. Further, when the plate portion of one of the brake discs is not provided with the tool insertion hole for rotating the nut, the labor of machining the tool insertion hole can be saved and the area of the sliding surface can be increased by the amount without the tool insertion hole. The number increases, the braking effect improves, and the durability also increases. In addition, wind noise is less likely to occur, and nuts and bolts do not come off.

As described above, according to the present invention, it is not necessary 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 cross-sectional view taken along the line IA-IA. It is an enlarged side view seen from the fin portion side for fastening the 2nd bolt by omitting a wheel. It is an enlarged side view seen from the fin portion side for fastening the 1st bolt by omitting a wheel. FIG. 5 is a perspective view of a wheel to which a second brake disc according to a first embodiment of the present invention is fastened, as viewed from the side opposite to the flange. FIG. 5 is a perspective view of a wheel to which the first brake disc according to the first embodiment of the present invention is fastened, as viewed from the flange side. It is an enlarged perspective view which shows the fin part for fastening the 1st or 2nd bolt, and the periphery thereof. It is an enlarged perspective view which shows the 1st bolt fastening fin portion, the 1st fastening bolt, the 1st nut and the periphery thereof. It is a rear view which shows the back surface of the 1st brake disc which concerns on Embodiment 1 of this invention. It is a rear view which shows the back surface of the 2nd brake disc which concerns on Embodiment 1 of this invention. It is a perspective view corresponding to FIG. 3A which concerns on the modification of Embodiment 1 of this invention. FIG. 5 is an enlarged side view of the first and second brake discs according to the embodiment of the present invention as viewed from the side of the fin portion for fastening the first bolt, omitting the wheels. FIG. 5 is an enlarged side view of the first and second brake discs according to the embodiment of the present invention as viewed from the side of the fin portion for fastening the second bolt, omitting the wheels. It is a perspective view which shows the fin part for fastening 1st bolt and the periphery thereof enlarged. It is a perspective view which shows the fin part for fastening 2nd bolt and the periphery thereof enlarged. It is a rear view which shows the back surface of the 1st brake disc which concerns on Embodiment 2 of this invention. It is a rear view which shows the back surface of the 2nd brake disc which concerns on Embodiment 2 of this invention.

Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings.

-Structure of 1st and 2nd brake discs-
1A to 4B show the first brake disc 1 and the second brake disc 11 for a railway vehicle according to the first embodiment of the present invention. As shown in FIG. 1C, one of the first brake discs 1 is detachably attached to one of the front and back sides of the disc portion 20a of the wheel 20 of the railroad vehicle by the first fastening bolt 21 and the first nut 22. As shown in FIGS. 1A and 1B, the other second brake disc 11 is detachably attached to the front and back sides of the disc portion 20a by the second fastening bolt 31 and the second nut 32. The first brake disc 1 and the second brake disc 11 are made of, for example, cast steel. The wheel 20 is provided with a flange portion 20b having a larger outer diameter than the other portions. Here, the first brake disc 1 is fixed inside the railroad vehicle width direction on the flange portion 20b side, and the flange portion is provided. The second brake disc 11 is fixed to the outside in the width direction of the railroad vehicle on the opposite side of 20b. The first fastening bolt 21 and the first nut 22, and the second fastening bolt 31 and the second nut 32 may be fastened together with washers 23 and 33 such as flat washers and spring washers. On the contrary, 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 having a circular opening in the center with the front surface side (outer surface side) as the sliding surface. The plate portions 1a and 11a are provided, respectively. In the present embodiment, as shown in FIGS. 4A and 4B, a plurality of first bolt fastening fin portions 2 or second bolt fastenings are fastened to the back surfaces (inner side surfaces) of the plate portions 1a and 11a at intervals from each other. The fin portions 12 are integrally projected.

The first brake disc 1 and the second brake disc 11 are provided with a total of six first bolt fastening fin portions 2 and second bolt fastening fin portions 12 at intervals of 60 °, respectively. , The number of each fin portion is not necessarily limited to six, and may be large or small. Further, an auxiliary fin portion may be integrally provided between the pair of first bolt fastening fin portions 2 and the second bolt fastening fin portion 12. Further, although not shown, rib portions extending in the circumferential direction connecting the first bolt fastening fin portions 2 or the second bolt fastening fin portions 12 to each other are projected on the back surfaces of the plate portions 1a and 11a, respectively. You may be.

As shown in FIG. 3A, the first bolt fastening fin portion 2 has a fin portion main body 2a protruding from the back surface of the plate portion 1a of the first brake disc 1, and the wheels of the wheels 20 are contained in the fin portion main body 2a. The first nut 22 to which the tip of the first fastening bolt 21 inserted into the side bolt insertion hole 20c is screwed is fastened. On the other hand, the second bolt fastening fin portion 12 has a fin portion main body 12a protruding from the back surface of the plate portion 11a of the second brake disc 11, and the wheel side bolt insertion hole 20c of the wheel 20 is provided in the fin portion main body 12a. The second nut 32 into which the tip of the second fastening bolt 31 inserted into the screw 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 and 11a in the fin portion main bodies 2a and 12a to slide the wheel side bolt insertion holes 20c. A first nut insertion notch 2e or a second nut insertion notch 12e is formed so as to pass through the circular bolt insertion holes 2b and 12b formed at positions facing the above. The fin portion main bodies 2a and 12a are also provided with fastened portions 2c and 12c formed of a flat surface that is fastened to the first nut 22 or the second nut 32 and press-contacts with the plate portions 1a and 11a.

As shown in FIGS. 1B and 1C, the first nut 22 and the second nut 32 have a pair of flat surfaces 22a and 32a that abut on the pair of inner surfaces of the fin portion main bodies 2a and 12a, respectively. As a result, the first or second nuts 22 and 32 inserted through the nut insertion notches 2e and 12e are fixed in a state of being stopped at appropriate positions of the fin portion main bodies 2a and 12a. Therefore, the first or second nuts 22 and 32 do not need the tool insertion hole 2d for inserting the tool.

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 nuts 22 and 32. A fin portion such as the fin portion 12 for fastening the 2nd or 2nd bolt is not provided. For convenience of assembly, a tool insertion hole 2d for fastening the second fastening bolt 31 is provided only on 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 insert a tool such as a hexagon wrench that fits into the hexagonal hole of the second fastening bolt 31 made of a hexagon socket head cap screw. All you need is. In this embodiment, as shown in FIGS. 2B and 4A, the tool insertion holes 2d are arranged at equal intervals with a distance of 60 ° from each other. The arrangement position is in the center of the pair of first bolt fastening fin portions 2 in the circumferential direction and at a position facing the second bolt fastening fin portion 12 of the second brake disc 11 in the assembled state with the wheels 20. It has become.

That is, the first or second bolt fastening fin portions 2 and 12 provided on the first and second brake discs 1 and 11, respectively, are displaced in the circumferential direction in a plan view when assembled to the wheel 20. It is placed in position. As described above, since the number of fastening fin portions 2 and 12 provided on the respective brake discs 1 and 11 is minimized, the structure is simplified.

In this way, as shown in FIG. 1A, the pair of first brake discs 1 and the second brake discs 11 are inserted with the wheel side bolts in a state where the disc portions 20a of the wheels 20 are sandwiched from both sides in the thickness direction. The tip of the first fastening bolt 21 inserted through 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 so that the wheel 20 is detachably fixed. It has become like.

-How to fasten the 1st and 2nd 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 described.

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

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

Next, as shown in FIG. 1A, in order to fasten the second brake disc 11, a required number of second fastening bolts 31 are placed on the side surface of the first brake disc 1 opposite to the sliding surface of the second brake disc 11. The bolt head 31a is set up at a position facing the second bolt fastening fin portion 12 so that the bolt head 31a is facing down as shown by the alternate long and short dash line in FIG. 1B. This position corresponds to the position where the tool insertion hole 2d is provided. At this time, the first brake disc 1 may be provided with a counterbore or groove for positioning 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, the wheel side bolt insertion hole 20c is slowly lowered so as to be aligned with 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 the first fastening bolts 21 are inserted. When the 1 fastening bolt 21 is sequentially tightened to the first nut 22 with a predetermined tightening torque, the first brake disc 1 and the wheel 20 are fastened 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 in the direction of the arrow.

Next, the second brake disc 11 into which the second nut 32 is fitted is fitted into the disk portion 20a of the wheel 20. At this time, the bolt is slowly lowered so that the tip of the second fastening bolt 31 comes to the position of the second nut 32 (bolt insertion hole 2b).

Finally, the wheel 20 is sandwiched between the first and second brake discs 1 and 11, and the wheel 20 is turned upside down, or the tool insertion hole of the first brake disc 1 is inserted from the first brake disc 1 side without turning over. When the second fastening bolt 31 is sequentially tightened to the second nut 32 with a predetermined tightening torque using a tightening tool such as a hexagon wrench inserted through 2d, the second brake disc is as shown in FIGS. 1A and 1B. The 11 and the wheel 20 are fastened to each other.

As described above, in the present 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 (screw-in direction), so that the tool insertion holes 2d May be large enough to be fastened by inserting a hexagon 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 is loosened, the first fastening bolt 21 does not pass through the wheel-side bolt insertion hole 20c and come out.

Further, a 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 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 second fastening bolt 31 does not come off.

Therefore, in the present embodiment, it is not necessary to provide through holes for inserting the first and second fastening bolts 21 and 31 in the plate portions 1a and 11a, and the first and second fastening bolts 21 and 31 can be pulled out. Can be reliably prevented.

-Modification example-
FIG. 5 shows a modified example of the first embodiment of the present invention, which is different from the first embodiment in that tap holes 2b'and 12b'are provided instead of the nuts 22 and 32. In the following modifications and the second embodiment, the same parts as those in FIGS. 1A to 4B are designated by the same reference numerals, and detailed description thereof will be omitted.

In this modification, the bolt insertion holes of the first bolt fastening fin portion 2'and the second bolt fastening fin portion 12'are not through holes but are formed of tapped tap holes 2b'and 12b'. There is. In this modification, as shown in FIG. 5, since the nuts 22 and 32 are not used, the notches 2e and 12e for inserting the nuts are not necessary, and the fin portions 2a'and 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 placed on the side surface 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 down. At this time, the wheel side bolt insertion hole 20c is slowly lowered so as to be aligned with 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 in which the second fastening bolt 31 is not inserted, and the first fastening bolt 21 is inserted. When the 21 is sequentially tightened to the tap hole 2b'with a predetermined tightening torque, the first brake disc 1'and the wheel 20 are fastened 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, the bolt is slowly lowered so that the tip of the second fastening bolt 31 comes to the position of the tap hole 12b'.

Finally, the first brake disc 1'is turned over while keeping the wheel 20 sandwiched between the first and second brake discs 1'and 11', or from the first brake disc 1'side without turning over. When the second fastening bolt 31 is sequentially tightened to the tap hole 12b'with a predetermined tightening torque using a tightening tool such as a hexagon wrench inserted into the tool insertion hole 2d of the above, the second fastening bolt 31 is similarly tightened to the tap hole 12b'. The brake disc 11'and the wheel 20 are fastened to each other.

Therefore, in this modified example, the trouble of mounting the nuts 22 and 32 is eliminated as compared with the first embodiment, and the first and second fastening bolts 21 and 31 can be easily and surely prevented from coming off with a simpler configuration. be able to.

(Embodiment 2)
-Structure of 1st and 2nd brake discs-
6A to 8B show the first and second brake discs 101 and 111 according to the second embodiment of the present invention, and are different from the first embodiment 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 detachably attached to one of the front and back sides of the disc portion 20a of the wheel 20 of the railroad vehicle by the first fastening bolt 121 and the first nut 122. As shown in FIG. 6B, the other second brake disc 111 is detachably attached to the front and back sides of the disc portion 20a by the second fastening bolt 131 and the second nut 132. The first brake disc 101 and the second brake disc 111 are made of, for example, cast steel. The wheel 20 is provided with a flange portion 20b having a larger outer diameter than the other portions. Here, the first brake disc 101 is fixed inside the railroad vehicle width direction on the flange portion 20b side, and the flange portion is provided. The second brake disc 111 is fixed to the outside in the width direction of the railroad vehicle on the opposite side of 20b.

In the present embodiment, as shown in FIGS. 8A and 8B, a plurality of first bolt fastening fin portions 102 or second bolt fastenings are fastened to the back surfaces (inner side surfaces) of the plate portions 101a and 111a at intervals from each other. The fin portions 112 are integrally projected.

The first brake disc 101 and the second brake disc 111 are provided with a total of six first bolt fastening fin portions 102 and second bolt fastening fin portions 112 at intervals of 60 °, respectively. , The number of each fin portion is not necessarily limited to six, and may be large or small. Further, an auxiliary fin portion may be integrally provided between the pair of first bolt fastening fin portions 102 and the second bolt fastening fin portion 112. Further, although not shown, rib portions extending in the circumferential direction connecting the first bolt fastening fin portions 102 or the second bolt fastening fin portions 112 to each other are projected on the back surfaces of the plate portions 101a and 111a, respectively. You may be.

As shown in FIG. 7A, the first bolt fastening fin portion 102 has a fin portion main body 102a protruding from the back surface of the plate portion 101a of the first brake disc 101, and the wheels of the wheels 20 are contained in the fin portion main body 102a. The bolt head 121a of the first fastening bolt 121 to be inserted into the side bolt insertion hole 20c is configured to be inserted. On the other hand, as shown in FIG. 7B, the second bolt fastening fin portion 112 has a fin portion main body 112a protruding from the back surface of the plate portion 111a of the second brake disc 111, and the wheel 20 is contained in the fin portion main body 112a. The bolt head 131a of the second fastening bolt 131 to be inserted into the wheel side bolt insertion hole 20c is inserted.

As shown by arrows in FIGS. 7A and 7B, the bolt heads 121a and 131a are slid along the back surfaces of the plate portions 101a and 111a into the wheel side bolt insertion holes 20c in the fin portion main bodies 102a and 112a. A notch 102e for inserting a first bolt head or a notch 112e for inserting a second bolt head is formed so as to pass to a position facing each other. The fin portion main bodies 102a and 112a are also provided with the fastened portions 102c and 112c formed of a flat surface that is fastened to the first fastening bolt 121 or the second fastening bolt 131 and press-contacted with the plate portions 101a and 111a. Since the bolt heads 121a and 131a do not need to be fastened, the tool insertion hole 2d for inserting the tool is not required.

As shown in FIGS. 6A and 6B, on the side of the first or second nuts 122 and 132 for fastening the first fastening bolt 121 or the second fastening bolt 131, the first bolt fastening fin portion 102 or the first bolt fastening fin portion 102 or the first bolt is fastened. There is no fin portion such as the 2-bolt fastening fin portion 112. For convenience of assembly, a tool insertion hole 2d for fastening the second nut 132 is provided only on one plate portion 101a. The inner diameter of the tool insertion hole 2d is smaller than the outer diameter of the second nut 132, so that a tool such as a hexagon wrench that fits into the hexagonal hole of the second nut 132 consisting of a nut with a hexagonal hole can be inserted. Just do it. In this embodiment, as shown in FIG. 8A, the tool insertion holes 2d are arranged at equal intervals with a distance of 60 ° from each other. The arrangement position is in the center of the pair of first bolt fastening fin portions 102 in the circumferential direction and at a position facing the second bolt fastening fin portion 112 of the second brake disc 111 in the assembled state with the wheels 20. It has become.

That is, the first or second bolt fastening fin portions 102 and 112 provided on the first and second brake discs 101 and 111, respectively, are displaced in the circumferential direction in a plan view when assembled to the wheel 20. It is placed in position. As described above, since the number of fastening fin portions 102 and 112 provided on the respective brake discs 101 and 111 is minimized, the structure is simplified.

As described above, as shown in FIGS. 6A and 6B, the pair of first brake discs 101 and the second brake discs 111 sandwich the disc portions 20a of the wheels 20 from both sides in the thickness direction of 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 the tip of the second fastening bolt 131 to the second nut 132, it can be attached to and detached from the wheel 20. It is designed to be fixed.

-How to fasten the 1st and 2nd 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 described.

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

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

Next, in order to fasten the second brake disc 111 as shown in FIG. 6B, a required number of second nuts 132 are placed on the side surface of the first brake disc 101 opposite to the sliding surface of the second brake disc 111. It is placed at a position facing the bolt fastening fin portion 112 so that the nut hole is on the bottom as shown by the alternate long and short dash line in FIG. 6B. This position corresponds to the position where the tool insertion hole 2d is provided. At this time, the first brake disc 101 may be provided with a counterbore or groove for positioning 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, the wheel side bolt insertion hole 20c is slowly lowered so as to be aligned with the tip of the first fastening bolt 121.

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

Next, as shown in FIG. 7B, the bolt head of the second fastening bolt 131 is in the direction of the arrow with respect to the notch 112e for inserting the bolt head of the second brake disc 111, and in the direction of the arrow along the back surface of the plate portion 111a. Fit 131a.

Next, the second brake disc 111 into which the second fastening bolt 131 is fitted is fitted into the disk portion 20a of the wheel 20. At this time, slowly lower the second fastening bolt 131 so that the tip of the second fastening bolt 131 comes to the position of the second nut 132.

Finally, the wheel 20 is sandwiched between the first and second brake discs 101 and 111, and the wheels 20 are turned upside down, or the first brake disc 101 is not turned inside out and the tool insertion hole of the first brake disc 101 is inserted. 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 hexagon wrench inserted through 2d, the second brake disc 111 and the wheel are as shown in FIG. 6B. 20 is in the concluded state.

As described above, in the present 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 (screw-in direction), so that the tool insertion hole 2d May be large enough to be fastened by inserting a hexagon wrench or the like into the hexagon socket provided in the second nut 132. Therefore, even if the first nut 122 is loosened, the first nut 122 and the first fastening bolt 121 will not come out through the wheel side bolt insertion hole 20c.

Further, a 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 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 first nut 122 and the first fastening bolt 121 do not come off.

Therefore, in the present embodiment, it is not necessary to provide through holes for inserting the first and second fastening bolts 121 and 131 in the plate portions 101a and 111a, and the first and second fastening bolts 121 and 131 can be pulled out. Can be reliably prevented.

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

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

In the first and second embodiments, the first brake discs 1, 1'and 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. Although not, the tool insertion holes 2d may be provided on the second brake discs 11, 11'and 111 sides as well.

In the first embodiment, the fastening bolt 21 and the fastening bolt 31 are all hexagon socket head bolts, but the fastening bolt 21 on the side that does not have the tool insertion hole 2d does not have to be a hole bolt. Ordinary bolts with hexagonal hole heads may be used. Similarly, in the second embodiment, the first nut 122 and the second nut 132 are all nuts with holes, but the first nut 122 on the side that does not have the tool insertion hole 2d is not a nut with holes. Or a normal hexagonal holeless nut may be used.

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.

1,1'1st brake disc
1a, 11a plate
2, 2'First bolt fastening fins
2a, 12a Fin body
2a', 12a' Fin body
2b, 12b Bolt insertion hole
2b', 12b' tap holes
2c, 12c to be fastened
2d tool insertion hole
2e, 12e Notch for nut insertion
11, 11'Second brake disc
12, 12'Second bolt fastening fins
20 wheels
20a disk part
20b Flange part
20c Wheel side bolt insertion hole
21 First fastening bolt
21a, 31a bolt head
22,32 nuts
22a, 32a Flat surface
23,33 washer
31 2nd fastening bolt 101 1st brake disc 111 2nd brake disc 101a, 111a Plate part 102 1st bolt fastening fin part 112 2nd bolt fastening fin part 102a, 112a Fin part main body 102c, 112c Fastened part 102d Tool insertion hole 102e Notch for inserting the first bolt head 112e Notch for inserting the second bolt head 121 First fastening bolt 121a, 131a Bolt head 122, 123 Nut 131 Second fastening bolt 132 Second nut

Claims (9)

A donut-shaped disc-shaped plate with the front surface as the sliding surface, and a bolt fastening provided on the back surface of the plate to fasten the tip of a fastening bolt that is inserted into the wheel side bolt insertion hole of the wheel. A pair of brake discs with fins
The above bolt fastening fins
The fin body provided at a position facing the wheel side bolt insertion hole and
A notch for inserting a nut, which is provided on the main body of the fin and allows the nut to pass to a position facing the bolt insertion hole on the wheel side.
A bolt insertion hole provided in the fin body and through which the tip of the fastening bolt is inserted,
It is provided on the fin portion main body, is fastened to the fastening bolt, and is provided with a fastened portion that is pressed against the peripheral edge of the wheel side bolt insertion hole.
The above fastening bolt is a bolt with a hole.
A brake disc characterized in that a nut for fastening the tip of the fastening bolt is fitted into the bolt fastening fin portion provided on the plate portion in a derotated state. The brake disc according to claim 1.
Of the pair of brake discs, one of the donut-shaped disc-shaped plates 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 portion is not provided with the tool insertion hole, and the fastening bolt on the other donut-shaped disc-shaped plate portion side is A brake disc that can be replaced with a holeless bolt. A donut-shaped disc-shaped plate with the front surface as the sliding surface, and a bolt fastening provided on the back surface of the plate to fasten the tip of a fastening bolt that is inserted into the wheel side bolt insertion hole of the wheel. A pair of brake discs with fins
The above bolt fastening fins
The fin body provided at a position facing the wheel side bolt insertion hole and
A tap hole provided in the fin body and for fastening the tip of the fastening bolt,
It is provided on the fin portion main body, is fastened to the fastening bolt, and is provided with a fastened portion that is pressed against the peripheral edge of the wheel side bolt insertion hole.
The above fastening bolt is a bolt with a hole.
A brake disc characterized in that the tip of the fastening bolt is fastened to the tap hole of the bolt fastening fin portion provided in the plate portion. The brake disc according to claim 3.
Of the pair of brake discs, one of the donut-shaped disc-shaped plates 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 portion is not provided with the tool insertion hole, and the fastening bolt on the other donut-shaped disc-shaped plate portion side is A brake disc that can be replaced with a holeless bolt. In the brake disc according to any one of claims 1 to 4.
The bolt fastening fin portions provided on the pair of brake discs are configured to be arranged at positions deviated from each other in the circumferential direction while being assembled to the wheels. disk. A method of fastening the first brake disc and the second brake disc to the wheels.
The first brake disc provided with the tool insertion hole for rotating and screwing the bolt head of the second fastening bolt for fastening the second brake disc is directed downward with the sliding surface side of the first brake disc facing downward. Installed on the mounting surface
Fit the first nut into the notch for inserting the first nut provided in the fin for fastening the first bolt of the first brake disc.
The number of second fastening bolts required to fasten the second brake disc is bolted on the side surface opposite to the sliding surface of the first brake disc at the position where the tool insertion hole of the first brake disc is located. Stand with your head down,
The wheel is placed on the first brake disc so that the wheel-side bolt insertion hole of the wheel is aligned with the position of the second fastening bolt.
Insert the first fastening bolt from the side opposite to the first brake disc into the wheel side bolt insertion hole into which the second fastening bolt is not inserted, and fasten the tip of the first fastening bolt to the first bolt. Sequentially tighten the first nut of the fin portion with a predetermined tightening torque to fasten the first brake disc and the wheel.
Insert the second nut into the notch for inserting the second nut of the second brake disc.
The second brake disc into which the second nut is fitted is fitted into the wheel so that the second nut faces the second fastening bolt.
The tip of the second fastening bolt is sequentially tightened to the second nut of the fin portion for fastening the second bolt with a tightening tool through the tool insertion hole of the first brake disc with a predetermined tightening torque. A method for fastening a brake disc, which comprises fastening the disc and the wheel. A method of fastening the first brake disc and the second brake disc to the wheels.
A first tap hole for fastening the first fastening bolt is provided in advance in the first bolt fastening fin portion of the first brake disc, and the first tap hole is provided.
A second tap 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 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. ,
The number of second fastening bolts required to fasten the second brake disc is bolted on the side surface opposite to the sliding surface of the first brake disc at the position where the tool insertion hole of the first brake disc is located. Stand with your head down,
The wheel is placed on the first brake disc so that the wheel-side bolt insertion hole of the wheel is aligned with the position of the second fastening bolt.
The first fastening bolt is inserted into the wheel-side bolt insertion hole into which the second fastening bolt is not inserted from the side opposite to the first brake disc, and the tips of the first fastening bolts are sequentially tightened to a predetermined position. Tighten the first tap hole of the first bolt fastening fin portion with an attached torque to fasten the first brake disc and the wheel.
The second brake disc is fitted into the wheel 20 so that the second tap hole faces the second fastening bolt.
The tip of the second fastening bolt is sequentially tightened to the second tap hole with a predetermined tightening torque by a tightening tool through the tool insertion hole of the first brake disc to tighten the second brake disc and the wheel. A method of fastening a brake disc, which comprises fastening. A pair of brakes including a donut-shaped disc-shaped plate portion having a sliding surface on the front surface side and a bolt fastening fin portion provided on the back surface of the plate portion and surrounding the wheel side bolt insertion hole of the wheel. It ’s a disc,
The above bolt fastening fins
The fin body provided at a position facing the wheel side bolt insertion hole and
A notch for inserting a bolt head provided in the fin body and passing the bolt head of a fastening bolt inserted into the wheel-side bolt insertion hole to a position facing the wheel-side bolt insertion hole.
It is provided with a nut with a hole provided on the main body of the fin portion and provided on the opposite side of the wheel-side bolt insertion hole, and a portion to be fastened to the peripheral edge of the wheel-side bolt insertion hole, which is fastened to the fastening bolt. Ori,
A brake disc characterized in that a tool insertion hole for rotating and screwing the perforated nut is provided in the plate portion at a position where the perforated nut is arranged. A method of fastening the first brake disc and the second brake disc to the wheels.
A first brake disc provided with a tool insertion hole for rotating and screwing a second nut for fastening the second brake disc is placed on a mounting surface with the sliding surface side of the first brake disc facing downward. Install and
Insert the bolt head of the first fastening bolt into the notch for inserting the first bolt head provided in the fin portion for fastening the first bolt of the first brake disc.
The number of second nuts required to fasten the second brake disc is on the side surface opposite to the sliding surface of the first brake disc, at the position where the tool insertion hole of the first brake disc is located. Place it so that it is on the bottom
The wheel is placed on the first brake disc so that the wheel-side bolt insertion hole of the wheel is aligned with the position of the second nut.
Fit the first nut to the tip of the first fastening bolt,
The first nut is sequentially tightened with a predetermined tightening torque to fasten the first brake disc and the wheel.
Insert the bolt head of the second fastening bolt into the notch for inserting the second bolt head provided in the second bolt fastening fin portion of the second brake disc.
The second brake disc into which the bolt head of the second fastening bolt is inserted is fitted into the wheel so that the second fastening bolt faces the second nut.
A brake disc characterized in that the second nut is sequentially tightened with a tightening tool through a tool insertion hole of the first brake disc to a predetermined tightening torque to fasten the second brake disc and the wheel. Fastening method.

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