JP2590438Y2 - Power unit for railway vehicles - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power unit for a railway vehicle in which a main motor and a gear unit are integrally supported and a main motor is supported by a gear unit for running a railway vehicle.

[0002]

2. Description of the Related Art In recent years, in a power plant for a railway vehicle, a flange portion is provided on a gear device and is engaged with a flange portion provided on an output shaft side end surface of a frame of a main motor, so that the main motor is cantilevered by the gear device. The structure has been developed. Thereby, the shaft of the small gear of the gear device and the shaft of the main motor can be integrated, and the bending joint between the small gear shaft and the main motor shaft can be omitted, so that the power unit for a railway vehicle can be downsized.

FIG. 2 is a sectional view of an essential part of an example of this type of conventional power unit for a railway vehicle, and FIG. 3 is a side view of the power unit excluding wheels, as viewed from a gear box side. Shaft 2 of main motor 2
a, a small gear 3a is provided at the output shaft end 2b, bearings 2c and 2d are provided at both ends of the shaft, and a bearing 2e is provided between the main motor 2 and the small gear 3a. Axis 2
a. In this power unit for a railway vehicle, an inner ring guide type cylindrical roller bearing is used as the bearing 2d at the small gear side shaft end.

A flange 2m engaging with a flange 3c provided on a small gear portion of a gear box 3b of a gear device 3 is provided on an end face on the output shaft end side of a frame 2f of the main motor 2, and these flanges are connected. The main motor 2 is configured to be cantilevered by the gear box 3b. Incidentally, the outer ring of the bearing 2d provided on the pinion 3a side end of the shaft 2a is represented by 2d _1, the inner ring are expressed in 2d _2.

On both sides of the large gear 3d meshed with the small gear 3a and press-fitted to the axle 4, the gear box 3b is supported by bearings 3e and 3f to face each other, while the small gear side of the gear box 3b is suspended. It is configured to be suspended on the carriage 1 by the device 6.

The torque of the main motor 2 is transmitted to the wheels 5 via the axle 4 via the large gear 3d meshing with the small gear 3a provided on the shaft 2a.

[0007]

As shown in FIG. 2, the conventional power unit for a railway vehicle supports the shaft 2a by an inner ring guide type cylindrical roller bearing. Even if it is pulled out or inserted straight in the axial direction, the tooth tip portion of the large gear 3d interferes with the rollers held by the bearing inner ring 2d2, so that the disassembly and assembly work is difficult and requires a lot of work time. .

The present invention has been made in view of the above points, and has a simple structure and does not interfere with the tooth tip portion of the large gear 3d and the bearing inner ring 2d ₂ during disassembly and assembly, thereby facilitating the operation. It is an object of the present invention to provide a railway vehicle power unit capable of performing disassembly and assembly in a short time.

[0009]

According to the present invention, a power unit for a railway vehicle according to the present invention comprises a main motor rotor shaft and a gear device small gear shaft integrated with a flange portion provided on an output shaft side end surface of a frame of the main motor. A railway vehicle in which the main motor and the gear device are integrated with each other by fastening the flange portion provided on the small gear portion of the gear box of the gear device with a fastening member so that the main motor is cantilevered by the gear device. An outer ring having an outer diameter of an inner ring smaller than a root diameter of a pinion of a small gear as a bearing for supporting a shaft end on a small gear side of a shaft in which the main motor rotor shaft and a gear device small gear shaft are integrated. It is characterized by using a guide type cylindrical roller bearing.

[0010]

[Function] Since the outer ring guide type cylindrical roller bearing whose outer diameter of the bearing inner ring is smaller than the tooth bottom circle diameter of the small gear is used to support the shaft end of the small gear, the tip of the large gear 3d is disassembled during disassembly and assembly. The shaft can be pulled out or inserted straight in the axial direction without interference between the portion and the bearing inner ring, and the disassembly and assembly operation can be easily performed.

[0011]

FIG. 1 is an enlarged sectional view of a shaft end of a small gear side of an embodiment of a power unit for a railway vehicle according to the present invention. The same parts as those in FIG. 2 are denoted by the same reference numerals. The bearing 2d at the shaft end on the small gear side is an outer ring guide type, and its inner ring 2d2
The outer diameter D2 of the small gear 3a is smaller than the root diameter D1 of the small gear 3a.

[0012]

[Effect of the Invention] As shown in FIG.
Since the outer diameter of the inner ring 2d2 is smaller than the root diameter D1 of the small gear 3a, even if the shaft 2b is pulled out straight in the axial direction during disassembly and assembly, the inner ring 2d2 of the bearing 2d will
The structure of this portion of the gear device 3 can be simplified without interfering with the tooth tip portion of d, and the disassembling and assembling work becomes easy, and the working time can be shortened.

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional view of a pinion-side shaft end portion of a power unit for a railway vehicle according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of an example of a conventional power unit for a railway vehicle.

FIG. 3 is a side view of the apparatus of FIG. 2 except for wheels, as viewed from a gear box side.

[Explanation of symbols]

 Reference Signs List 1 cart 2 main motor 2a main motor rotor shaft 2b output shaft end 2c bearing 2d output shaft end bearing 2d1 bearing outer ring 2d2 bearing inner ring 2e bearing 2f frame 2m flange 3 gear unit 3a small gear 3b gear box 3c flange 3d Large gear 3e, 3f Bearing 4 Axle 5 Wheel 6 Suspension device D1 Root circle diameter of small gear D2 Outer diameter of inner ring of bearing at shaft end on small gear side

Claims (1)

(57) [Scope of request for utility model registration] 1. A flange (2m) provided on an output shaft side end face of a frame of a main motor by integrating a main motor rotor shaft (2a) and a gear device small gear shaft (2b), and a gear of a gear device. A flange portion (3c) provided on the small gear portion of the box is fastened by a fastening member, so that the main motor is cantilevered by the gear device, and the power for a railway vehicle in which the main motor and the gear device are integrated. In the apparatus, the main motor rotor shaft (2a) and the gear device small gear shaft (2)
The outer ring guide type cylindrical roller bearing (2d) whose outer diameter of the bearing inner ring is equal to or less than the root circle diameter of the small gear is used as a bearing for supporting the shaft end on the small gear side of the shaft integrated with b). Power unit for railway vehicles.