JPH11240448A - Bogie for rolling stock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the unsprung mass by joining the joints on both ends of a hollow shaft to which the rotator of a motor is provided to the vehicle via the cushion rubber. SOLUTION: A rotator 32 of a motor is disposed on an outer surface of a hollow shaft 31 located at a center portion of a rotating axle 10. A stator 33 is fixed to an outer surface of the rotator 32 via bearings 34 at both ends of the hollow shaft 31. The stator 33 is fixed to a bogie frame 20 via a spring 16 or the like. Also, both ends of the hollow shaft 31 are fixed to wheels 24 via joints 40. The joint 40 is fixed to the wheel 24 by a plurality of fastening screws 41. A rubber bush 42 is disposed on an outer periphery of the fastening screws 41. By disposing the rubber bush 42 between the wheel 24 and the fastening screw 41 that connects the joint 40 to the wheel 24, adjusting the rigidity of the bush 42 enables elastic supporting of the mass of the motor and the joint 40. Therefore, the unsprung mass is reduced when passing over a rail joint.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner rotor type direct drive type railway vehicle drive device.

[0002]

2. Description of the Related Art As an inner rotor type direct drive type railway vehicle drive device, [No.
Proceedings of the Annual Transport and Logistics Section (Railway Symposium)
[1997-7.28-30.Tokyo] Pages 201-204 "1216
Development of a direct drive system for next-generation commuter trains ".
In this method, a hollow shaft is provided concentrically with an axle, a rotor is fixed to the hollow shaft, a stator is fixed to the hollow shaft via a bearing, and the electric motor is a fully-closed type. Joints are provided at both ends of the hollow shaft, and the joints are connected to joints fixed to the axle via vibration isolating rubber. Both ends of the axle support the bogie frame via bearings and springs.

[0003]

In the above arrangement, the reduction of the unsprung weight is considered. However, the unsprung weight is also large, and the unsprung weight is greatly influenced by the unsprung weight. This increases the large wheel load and increases the track maintenance cost.

An object of the present invention is to reduce unsprung weight.

[0005]

The above object can be attained by fastening the rotor and the wheel via a cushion rubber.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. Both ends of the rotating axle 10 support a bogie frame 20 via a bearing 15 and a spring 16. Bogie frame 20
Supports a vehicle body 26 via a spring 25. Axle 10
Has a hollow shaft 31 at the center thereof, and a rotor 32 of the electric motor is installed on the outer surface thereof. A stator 33 is disposed on the outer surface of the rotor 32, and is fixed to both ends of the hollow shaft 31 via bearings 34. The stator 33 is connected to the bogie frame 2 via a spring or the like.
It is fixed to 0. Both ends of the hollow shaft 31 are fixed to the wheels 25 via joints 40. The joint 40 is fixed to the wheel 24 by a plurality of fastening screws 41. A rubber bush 42 is arranged on the outer periphery of the screw 41. The hollow shaft and the joint are fixed by press fitting, spline, bolting, or the like.

[0007] According to this structure, at least one joint can be dispensed with, so that the unsprung weight can be reduced.

Further, since the rubber bush 42 is arranged between the fastening screws 41 connecting the wheel 24 and the joint 40, the rigidity of the rubber bush 42 is adjusted so that the weight of the motor and the joint 40 can be elastically adjusted. This can solve the problem that the unsprung weight such as a large wheel weight, which is a problem when passing through the rail joint, has a large effect.

[0009]

According to the present invention, the unsprung weight can be reduced, and the running performance of the vehicle including the reduction of the track load can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a bogie for a railway vehicle according to an embodiment of the present invention.

[Explanation of symbols]

10: axle, 15: bearing, 16: shaft spring, 20: bogie frame, 24: wheel, 31: hollow shaft, 32: motor rotor,
33: stator, 40: joint, 41: fastening screw, 42: rubber bush.

Claims (2)

[Claims] 1. A hollow shaft is provided on the outer periphery of an axle, a rotor of an electric motor is provided on the hollow shaft, a stator supported by the hollow shaft is provided on the outer periphery of the rotor, and both ends of the hollow shaft are provided. A bogie for a railway vehicle, wherein the installed joint is fixed to the wheel via a buffer rubber. 2. The bogie for a railway vehicle according to claim 1, wherein the joint and the wheel are fixed to each other by a fastening screw having a rubber bush on an outer periphery.