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Railway vehicle drive unit

a technology for driving units and railways, which is applied in the direction of locomotive transmissions, gearing, electric motor propulsion transmissions, etc., can solve the problems of reducing the torque loss of the reducer, affecting the lubrication performance of the reducer, and the lubricant oil amount is likely to run short in the vicinity of the input shaft, so as to achieve superior lubrication performan

Inactive Publication Date: 2011-01-06
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]It is an object of the present invention to provide a railway vehicle drive unit superior in lubrication performance, by keeping a constant oil surface height of a lubricant oil.
[0007]It is another object of the present invention to provide a railway vehicle drive unit in which heat generation and torque loss are decreased, and a lubrication performance is improved.

Problems solved by technology

However, the lubricant oil in the reducer is moved toward the radial outer side due to centrifugal force generated by the rotation, the lubricant oil is likely to run short in the vicinity of the input shaft (on the radial inner side).
Meanwhile, when the lubricant oil sealed in the reducer is increased to ensure a lubricant oil amount around the input shaft, heat generation is increased due to agitation resistance, and a torque loss of the reducer is increased.
That is, the problem is that the lubricant oil amount runs short in the vicinity of the input shaft when the reducer is operated.

Method used

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Examples

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first embodiment

(1) First Embodiment

[0062]A description will be made of a railway vehicle drive unit 12 according to one embodiment of the present invention and a railway vehicle wheel drive device 10 including the railway vehicle drive unit 12, with reference to FIGS. 1 to 3. In addition, FIG. 1 is a schematic cross-sectional view of the railway vehicle wheel drive device 10, FIG. 2 is a cross-sectional view taken along a line II-II in FIG. 1, and FIG. 3 is an enlarged view showing a periphery of eccentric parts 16a and 16b.

[0063]First, referring to FIG. 1, the railway vehicle wheel drive device 10 is composed of a railway vehicle wheel 11 (hereinafter, referred to as “the wheel 11”) and the drive unit 12 (hereinafter, referred to as “the railway vehicle drive unit 12”) held on an inner diameter surface of the wheel 11 to reduce rotation speed of a drive source (not shown) and transmit it to the wheel 11, and arranged in a lower part of a railway vehicle body (not shown).

[0064]The railway vehicle...

second embodiment

(2) Second Embodiment

[0103]Next, a second embodiment of the present invention will be described. FIG. 4 is a view showing a configuration of a railway vehicle wheel drive device according to the second embodiment. Referring to FIG. 4, according to this embodiment, a railway vehicle drive unit 12 is composed of a reducer housing 13, an input side rotation member 14, a reducing mechanism 15, a carrier 23 as a fixed member, and first and second axle bearings 24 and 25, which is the same as the above embodiment.

[0104]However, this embodiment is different from the above embodiment in that a lubricant oil holding chamber 35 is provided in the carrier 23. Therefore, a part different from that of the above embodiment will be described in detail, and the same part has the same reference, and its description is not reiterated.

[0105]The reducer housing 13 has a space sealed with a lubricant oil, and is held on an inner diameter surface of a wheel 11. The space sealed with the lubricant oil mea...

third embodiment

(3) Third Embodiment

[0119]Next, a third embodiment of the present invention will be described. FIGS. 6 to 14 are views showing a railway vehicle drive unit according to the third embodiment. Referring to these drawings, a description will be made of a railway vehicle drive unit 112 according to the third embodiment and a railway vehicle wheel drive device 110 including the railway vehicle drive unit 112. In addition, FIG. 6 is a schematic cross-sectional view of the railway vehicle wheel drive device 110, FIG. 7 is a cross-sectional view taken along a line VII-VII in FIG. 6, FIG. 8 is an enlarged view of a periphery of ecentric members 116a and 116b, FIG. 9 is an enlarged view of an inner pin 119, FIG. 10 is an enlarged view of an inner pin 120, FIGS. 11 to 13 are views showing pumps as a lubricant oil transferring mechanism, and FIG. 14 is a view showing a counterweight 122 provided with a lubricant oil transferring mechanism.

[0120]First, referring to FIG. 6, the railway vehicle wh...

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Abstract

A railway vehicle drive unit (12) is a drive unit to rotatably drive a wheel (11) of a railway vehicle. More specifically, it includes a reducer housing (13) held on an inner diameter surface of the wheel (11), and integrally rotating with the wheel (11), an input side rotation member (14) connected to a drive source, a reducing mechanism (15) to reduce rotation speed of the input side rotation member (14) and transmit it to the reducer housing (13), a fixed member (23) arranged in the reducer housing (13) and connected and fixed to a vehicle body, axle bearings (24) and (25) to rotatably support the reducer housing 13 with respect to the fixed member (23), and lubricant oil circulating mechanisms (32) and (33) to circulate a lubricant oil between the reducing mechanism and the axle bearings (24) and (25).

Description

TECHNICAL FIELD[0001]The present invention relates to a railway vehicle drive unit and more particularly, to a railway vehicle drive unit capable of driving right and left wheels independently.BACKGROUND ART[0002]A conventional railway vehicle drive unit is disclosed in Japanese Unexamined Patent Publication No. 2007-230508, for example. The railway vehicle drive unit disclosed in this document includes a motor, and a reducer to reduce rotation speed of the motor and transmit it to a wheel.[0003]In this railway vehicle drive unit, a cycloidal reducer which is compact in size and implements a high reduction ratio is used to generate torque required to run a railway vehicle, and to provide a large passenger compartment space. More specifically, it is composed of an input shaft integrally rotating with the motor, a curved plate rotatably supported by an eccentric part provided in the input shaft, an outer pin to generate rotation motion of the curved plate by engaging with a periphery ...

Claims

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Application Information

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IPC IPC(8): B61C9/00B61C9/46F16H1/32
CPCB61C9/46F16H57/0482F16H57/0471F16H1/32
Inventor MIKI, DAISUKEKATAOKA, YUKIHIROADACHI, TAKAYAYAMADA, MASAHIROGOTO, DAISUKETAMADA, KENJI
Owner NTN CORP
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