WO1997010982A1

WO1997010982A1 - Truck for a railway vehicle

Info

Publication number: WO1997010982A1
Application number: PCT/JP1995/001878
Authority: WO
Inventors: Terumichi Muramoto; Hideo Takai; Motomi Hiraishi; Tetsuji Hirotsu
Original assignee: Hitachi, Ltd.
Priority date: 1995-09-20
Filing date: 1995-09-20
Publication date: 1997-03-27
Also published as: AU3532595A

Abstract

In a case where an axle rotatably supporting wheels is fixed, it is easy to replace wheels and bearings carrying the wheels and prevent the generation of fretting corrosion. Two tapered rubber bushes (61, 62) are disposed between an axle (50) rotatably supporting a wheel (30) and an axle box (37) supporting the axle (50) and the rubber bush (61) is pressed by means of a metal fixture (65) from a shaft end side. The spring constant in a vertical direction of the rubber bushes (61, 62) is smaller than the spring constant in a vertical direction of a spring (43) between the axle box (37) and a truck frame. The spring constant in a vertical direction of the rubber bushes (61, 62) ranges from 1000 kgf/mm to 5000 kgf/mm per axle box.

Description

Specification

Railcar bogie

5 Technical fields

The present invention relates to a bogie for a railway vehicle, particularly a bogie in which an axle supporting wheels is prevented from rotating. Background art

Generally, a bogie of a railway vehicle has an axle having two wheels attached to an axle box, and the axle box has a spring disposed thereon to support the bogie frame. Furthermore, a spring is arranged on the bogie frame to support the vehicle body. The axle is generally installed on the axle box in a rotating manner.

5 However, as shown in Japanese Patent Application Laid-Open No. 7-9993, the wheels are provided rotatably with respect to the axle, and when the wheels are directly rotated by an electric motor, the axle is provided so as not to rotate. . The wheels are supported on the axle via bearings. The axle is supported by the axle box. Since this bogie is designed to run on both wide and narrow gauges, the axle is rotated by a hydraulic cylinder when changing the distance between a pair of wheels. The axle is prevented from rotating by this hydraulic cylinder.

There is a bogie in which two axles are fixed to one bogie frame in a bogie that rotatably supports the axle with bearings. In this bogie, a cylindrical rubber bush is arranged between the bogie frame and the bearing. The purpose of this rubber bush is mainly for steering on curved sections.

Five

Disclosure of the invention

The JP 7 - 9 9 9 No. 3 by indicating in Japanese sea urchin, in that provided on the rotary self standing the wheel relative to the axle, _c該特No. 7 axles it is necessary that I not rotate Unisuru - According to the publication disclosed in Japanese Patent Publication No. 9 993, a lepper provided at the shaft end of the axle It is considered that the side beam of the bogie frame is connected with the hydraulic cylinder to prevent rotation of the axle. The truck has a hydraulic cylinder to change the wheel spacing.

If the distance between the wheels is not changed, it is considered that the axle is pressed into the axle box and the hydraulic cylinder is eliminated.

When an axle is press-fitted into an axle box, it is not easy to press-fit it, and it is not easy to replace wheels and their bearings. In addition, there is a possibility that fretting friction may occur due to slight slippage due to axle deflection that occurs during traveling. An object of the present invention is to make it easy to assemble a bogie, replace wheels and its bearings, and to prevent the occurrence of a fretting-copper joint. The purpose is to improve ride comfort against unevenness of the rail joint.

The above object is achieved by disposing a rubber bush between an axle that supports wheels rotatably and an axle box that supports the axle.

The second object is achieved by setting the spring constant of the rubber bush in the vertical direction in the range of 100,000 kgf / mm to 500,000 kgfZmm per uniaxial box.

The rubber bushing prevents the contact between metals, and the rubber bush can absorb the displacement between the axle and the axle box. This can prevent fretting contact due to sliding of the metal contact portion. Also, since the connection between the axle and the bearing is made of a rubber bush, the axle can be easily separated from the axle box, and the wheels and their bearings can be easily replaced.

By setting the spring constant in the vertical direction of the rubber bush to the above-mentioned value, it is possible to improve the riding comfort against the unevenness of the joint of the rail. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a longitudinal sectional view of an axle support device according to one embodiment of the present invention.

FIG. 2 is a plan view of a truck according to one embodiment of the present invention. FIG. 3 is a side view of FIG.

Fig. 4 shows the relationship between the spring constant of the rubber bush supporting the axle and the maximum value of wheel load fluctuation.

FIG. 5 is a longitudinal sectional view of an axle support device according to another embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of an axle support device according to another embodiment of the present invention.

FIG. 7 is a longitudinal sectional view of an axle support device according to another embodiment of the present invention.

FIG. 8 is a side view of an axle support device according to another embodiment of the present invention.

FIG. 9 is a longitudinal sectional view of FIG.

FIG. 10 is a side view of an axle support device according to another embodiment of the present invention.

FIG. 11 is a longitudinal sectional view of an axle support device according to another embodiment of the present invention.

FIG. 12 is a cross-sectional view taken along line 12-2 of FIG. BEST MODE FOR CARRYING OUT THE INVENTION

One embodiment of the present invention will be described with reference to FIGS. Each of the two axles 50 has two wheels 30 mounted via bearings 31. There is a motor 33 between the two wheels 30, 30. The stator of the compressor 33 is fixed to the axle 50, and the rotor is connected to the wheel 30. Both ends of the axle 50 are installed in the axle box 37. The arm 38 to which the axle box 37 is fixed is connected to the bogie frame 40 so as to be vertically rotatable. A spring 43 such as a coil spring is disposed between the axle box 37 and the bogie frame 40. The bogie frame 40 turns the air spring 45 to support the vehicle body 49. The spring 43 allows a large displacement so that the wheel 30 follows the rail when traveling on a curved portion.

In FIG. 1, a configuration for supporting the axle 50 on the axle box 37 will be described. The portions 51 supported by the axle boxes 37 at both ends of the axle 50 are smaller in diameter than the inside diameter. Rubber bushes 61 and 62 having a tapered outer diameter are inserted between the support portion 51 and the axle box 37. The inner diameter side is straight. The small diameter sides of the rubber bushes 61 and 62 are opposed to each other. There is a space between the rubber bushes 61 and 62. The inner surface of the shaft box 37 that supports the rubber bushes 61 and 62 is tapered to correspond to the outer diameter of the rubber bush. Axle end of axle 50 A retainer 65 that presses the shoe 61 in the axial direction is fixed with a bolt 66. As a result, the rubber bushes 61 and 62 are in close contact with the axle 50 and the box 37. This is called pre-compression. The holding bracket 65 is in contact with the end of the axle box 37. The axial end of the rubber bush 61, that is, between the axial end of the holding bracket 65 and the axial end of the axle box 37, the axial end of the rubber bush 62, A gap s is provided between the end of the large diameter portion of the axle 50 and the end of the axle box 37 in the axial direction. After arranging the rubber bush 62 at the shaft end of the axle 50, insert it into the hole of the axle box 37. The material of the rubber bush is rubber, urethane, or the like. 30 a is a connection portion between the wheel 30 and the electric motor 35. According to such a configuration, the rubber bushes 61, 62 are brought into close contact with the axle 50 and the axle box 37 by pressing the tapered rubber bushes 61, 62 with the metal fitting 65, and the axle 5 Since 0 is fixed to the axle box 37, there is no play between the rubber bushes 61 and 62, and stable support rigidity can be obtained. Since the rubber bushes 61 and 62 are tapered, the axle 50 can be firmly fixed to the axle box 37.

Since the axle 50 is supported on the axle box 37 by the tapered rubber bushes 61 and 62, the axle 50 is easily separated from the axle box 37 except for the brackets 65 and 66. It can be done. Therefore, the wheels 30 and the bearings 31 thereof can be easily replaced.

The displacement between the axle 20 and the axle box 37 due to the torsion of the axle 50 is absorbed by the rubber bushes 61 and 62. Since the portion is not in metal contact, fretting can be prevented. If there is a possibility of fretting corrosion, periodic nondestructive inspection of the concerned part is necessary, but this can be eliminated.

In addition, since the rubber bushes 61 and 62 are provided, the unsprung mass of the axle box 37 and the spring 43 is reduced. As a result, the ride comfort can be improved. Specifically, this is allowed for the load due to the unevenness of the rail joint. For this reason, the ride comfort can be improved.

Fig. 4 shows the relationship between the spring constant in the vertical direction and the change in wheel load when the rubber bushes 61 and 62 are used by simulation. simulation The condition of is that the train runs at less than 100 km / h in Japan, and that the train constant is equivalent to the welding joint of a long rail. According to this, if the vertical spring constants of the rubber bushes 25 and 26 are selected within the range of "100 to 500 kgf mm Z-axis box", it will be much larger than that of the conventional rigid support. In addition, wheel load fluctuation can be reduced. This value is selected from the viewpoint of improving the ride comfort against the load due to the unevenness of the rail joint (equivalent to the welding joint of the long rail). If the wheel load fluctuation is reduced, vibration from the track to the bogie or vehicle body can be reduced, and riding comfort can be improved. In particular, from Fig. 4, "2000 kgf to 350 kgf / mm / axle box" can reduce wheel load fluctuation and improve ride comfort. The same can be said for a Shinkansen train traveling 300 km / h from 200 kmZh.

—Generally, the spring constant in the vertical direction of the spring 43 is “100 kgf ~ 200 kgf mmZ axis box”. Therefore, the vertical spring constant of the rubber bushes 61 and 62 is larger than the vertical spring constant of the spring 43. The spring constant of the rubber bushes 61 and 62 is about 5 times or more greater than that of the spring 43.

Since the shaft end is supported by the two rubber bushes 61 and 62, the spring constant of one rubber bush 61 can be changed with respect to the spring constant of the other rubber bush 62. According to this, fine adjustment of the support rigidity of the axle 50 can be facilitated.

When the spring constant of the two rubber bushes is changed,

Make the inner diameter of 2 larger than the inner diameter of rubber bush 6 1. The diameter of the shaft end of the axle 50 is changed accordingly. The diameter should be such that the wrong rubber bush cannot be placed. According to this, incorrect arrangement of the rubber bush can be prevented.

The rubber bush 61 located at the shaft end can be tapered on the inner diameter side. The rubber bush can be tapered both inside and outside.

In the embodiment of FIG. 5, the tapered rubber bushes 61 and 62 are replaced with flanged rubber bushes 61a and 62a. Because of the flange, the panel constant in the axial direction can be increased. Others are the same as the above-mentioned embodiment.

When changing the spring constant etc. of the two rubber bushes, By changing the diameters of the flanges of the shells 61a and 62a, it is easy to identify the installation position between the inside and the outside.

The embodiment of FIG. 6 is a case where one cylindrical rubber bush 71 is used. After arranging the rubber bush 71 on the shaft end of the axle 50, insert it into the hole of the axle box 37. Others are the same as the above-mentioned embodiment. Since one rubber bush 7 1 can be used, the cost can be reduced.

The embodiment shown in FIG. 7 is a case where two-part cylindrical rubber bushes 75 and 76 are used. At the center in the axial direction of the axle box 37, a partition for separating the two rubber bushes 75, 76 is provided. After arranging the rubber bush 76 on the axle end of the axle 50, insert it into the hole of the axle box 37. Others are the same as the above-mentioned embodiment. Since one rubber bush 7 1 can be used, the cost can be reduced.

The following embodiment is a means for preventing the rotation of the axle 50 when the axle 50 rotates with the support of the rubber bush.

8 and 9, the arm 81 is fixed to the shaft end of the axle 50 by a bolt 82. The tip of the arm 81 and the arm 38 supporting the axle box 37 are connected by a link 84. The link 84 is rotatably connected to the arms 38, 81 by pins 85, 86. A rubber bush (not shown) for allowing the displacement of the axle 50 due to the displacement of the rubber bushes 61 and 62 is arranged around the pins 85 and 86. The rubber bush is disposed on the support of either the arm 81 or the link 84, or on the support of the link 84 or the arm 38. Thus, rotation of the axle 50 can be prevented. At the center of the holding bracket 65a, there is a hole for setting the arm 81. There are a plurality of bolts 6 6. If the gap between the holes of the arms 38, 81 and the link 84 and the pins 85, 86 is large, the rubber bush can be eliminated.

The embodiment shown in FIG. 10 is an embodiment in which the link 84 a is connected to the bogie frame 40. In the embodiment shown in FIGS. 11 and 12, a key 91 is arranged between the axle 50 and the axle box 37. There is a gap s between the key 9 1 and the keyway 9 2 of the axle box 37. The gap s is on both sides and the radially outer surface of the key 91.

The present invention can be applied to a configuration in which the configuration of the axle box 37 and the arm 38 is a known shape. You. As in the bogies in Figs. 2 and 3, in a bogie with a spring 43 with a large permissible displacement between the axle box 37 and the bogie frame 40, the bearing and the axle box rotatably support the axle. And a rubber bush having the above-mentioned spring constant. According to this, riding comfort can be improved. Industrial applicability

ADVANTAGE OF THE INVENTION According to this invention, when fixing an axle, a wheel and its bearing can be exchanged easily and the occurrence of fretting corrosion can be prevented.

Also, the load due to the unevenness of the rail joint can be reduced, and the riding comfort can be improved.

Claims

The scope of the claims

1. A bogie for a railway vehicle, characterized in that a rubber bush is arranged between an axle supporting wheels rotatably and an axle box supporting the axles.

2. In claim 1, a metal fitting for pressing the rubber bush is fixed to the axle from the end side of the axle, and the other end of the rubber bush is in contact with the large diameter portion of the axle. A bogie for a railway vehicle, characterized by:

3. The bogie for a railway vehicle according to claim 2, wherein the rubber bush is pressed toward the other end by a holding metal fixed to the shaft end of the axle.

4. The bogie for a railway vehicle according to claim 2, wherein the rubber bush is in close contact with the axle and the axle box.

5. In Claim 2, between the presser fitting in contact with the rubber bush and one end of the axle box, the large diameter portion of the axle in contact with the rubber bush and the other end of the axle box. A bogie for a railway vehicle, wherein a gap is provided between the bogie and the bogie.

6. The bogie for a railway vehicle according to claim 2, wherein the rubber bush has an outer diameter or an inner diameter that is tapered.

7. The rubber bush according to claim 6, wherein the rubber bush is divided into two in the axial direction of the axle, the outer side is tapered, and the small diameter sides of the two rubber bushes are opposed to each other. Bogies for rolling stock.

8. In Claim 2, each of the rubber bushes has a flange at a large-diameter end, and one rubber bush is in contact with the holding bracket and one end of the axle box, respectively. The other rubber bush is in contact with the other end of the axle box and the large diameter portion of the axle, respectively.

9. The bogie for a railway vehicle according to claim 2, wherein the rubber bush is cylindrical.

10. The truck for a railway vehicle according to claim 9, wherein the number of the rubber bushes is one.

11. The railway vehicle according to claim 2, wherein a vertical spring constant of the rubber bush is in a range from 100 kgf Z mm to 500 kg kg / mm per axle box. Trolley.

1 2. The railway vehicle according to claim 2, wherein a vertical spring constant of the rubber bush is in a range of 200 kgf / mm to 350 kgf Zmm per axle box. Trolley.

1 3. The bogie for a railway vehicle according to claim 1, wherein the arm of the axle box and the axle are connected by a link.

1 4. In claim 1, a spring S is arranged between the axle box and the bogie frame, and the bogie frame and the axle are connected by a link. Bogies for railway vehicles.

1 5. In Claim 1, a key is provided on the axle, and a gap is provided between the keyway of the axle box corresponding to the key and the key. Bogies for rolling stock.

1 6. A spring is disposed between the axle box supporting both ends of the axle and the bogie frame, the axle box supports the axle via a bearing, and between the bearing and the axle box. A rubber bush is arranged, and the allowable vertical displacement of the spring is larger than that of the rubber bush.The vertical spring constant of the rubber bush is set to 100 kgf Zmm per shaft box from 5 to 5 kgf Zmm. A bogie for a railway vehicle, characterized by having a range of 0.0 kgf / mm.