JP2000344100A - Rolling bearing device for rolling stock driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent seizure due to defective lubrication of a bearing for a small gear by providing a groove extending in the circumferential direction in a large-diameter side non-track surface part of an outer ring inner peripheral surface of a conical roller bearing for a small gear. and providing an elastic member for holding lubricating oil in the groove to form a lubricating oil reservoir of the inside of the bearing. SOLUTION: A rolling bearing device for a small gear is a conical rolling bearing, and formed by an outer ring 23, an inner ring 24, many conical rollers 25 interposed between the inner and outer rings, and a retainer 26 for retaining the conical rollers 25. In a large-diameter side non-track surface part of the inner peripheral surface of the outer ring 23, a peripheral groove 28 is formed extending over the whole periphery, and an annular elastic member 29 such as rubber or the like is fitted in the peripheral groove 28 to form a lubricating oil reservoir. Even during stopping of operation such as vehicle stop or the like, lubricating oil is stayed and held in the bearing, thereby enabling initial lubrication at the start of operation. Even in a cold district, seizure due to defective lubrication can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a gear bearing of a drive unit for a railway vehicle.

[0002]

2. Description of the Related Art In a railway vehicle driving device, a large gear fixed to an axle to which wheels are attached is meshed with the large gear, and is driven by a rotary drive source to transmit rotation to the large gear. Small gears. The axle is supported on the body frame via a rolling bearing for a large gear, and the small gear is supported on the body frame via a rotating shaft via a pair of rolling bearings.

Conventionally, tapered roller bearings as shown in FIG. 4 have been used as rolling bearings for small gears. The tapered roller bearing includes an outer ring 1, an inner ring 2, a plurality of tapered rollers 3 interposed between the outer and inner rings, and a retainer 4 for supporting the tapered rollers 3.

In such a bearing device for a drive device,
A lubricating oil reservoir is provided at the bottom of the bearing device for the large gear fixed to the axle, and a part of the large gear is immersed.
The so-called splash lubrication system in which lubrication of the small gear bearing device is performed with lubricating oil scooped up from the lubricating oil pool by a large gear is adopted.

[0005]

SUMMARY OF THE INVENTION In a drive unit for a railway vehicle, a lubricating oil is sufficiently supplied to a small gear bearing relatively far from a lubricating oil reservoir provided at the bottom of a large gear bearing device. If there is no problem with the function of the bearing,
When the vehicle is stopped, the lubricating oil adhering to the inside of the bearing may flow out of the bearing, and the lubricating oil may run out.

In a cold region, when the vehicle is stopped, the lubricating oil in the lubricating pool at the bottom of the drive unit becomes highly viscous, and when the vehicle starts, the lubricating oil is not sufficiently sprayed due to the lubricating oil supplied by the large gears. There is a possibility that the small gear bearing may be operated in a state where the lubricating oil for the gear bearing is insufficient. Therefore, in the severe winter season, sufficient care was required to supply the lubricating oil to the small gear bearings.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention extends circumferentially to a large-diameter non-track surface portion of an inner peripheral surface of an outer ring of a tapered roller bearing for a small gear of a railway vehicle driving device. A groove is provided, and an elastic member for holding lubricating oil is provided in the groove to form a lubricating oil reservoir inside the bearing.

According to this configuration of the present invention, even if the vehicle stops, the operation of the drive unit stops, and the rotation of the tapered roller bearing for the small gear of the drive unit stops, the outer ring of the tapered roller bearing is lubricated. Since an oil sump is formed and the lubricating oil in the tapered roller bearing is prevented from flowing out of the bearing, the next operation restart at the beginning of operation is performed using the lubricating oil held in the lubricating oil sump of the bearing outer ring. First, the lubrication is performed, and then the lubrication is performed by spraying oil with a large gear fixed to the axle as time elapses after the start of operation, so that the drive device bearings are normally lubricated from the beginning of operation.

[0009]

FIG. 1 is a partial sectional view of a bearing device for a railway vehicle drive device incorporating a tapered roller bearing according to a preferred embodiment of the present invention. In FIG. 1, a large gear 13 is fixed to an axle 12 to which a vehicle wheel 11 is attached and fixed, and the large gear 13 meshes with a small gear 15.
A rotating shaft 16 integrated with the small gear 15 transmits rotation from a rotary drive source such as an electric motor (not shown) to the axle 12 via the small gear 15 and the large gear 13 to rotate the wheel 11.

Therefore, the large gear 13 and the axle 12 are supported on the vehicle frame via a large gear rolling bearing 18 which is a double row tapered roller bearing, and the small gear 15 and its rotating shaft 16 are connected to the small gear. Are supported on the vehicle frame side via rolling bearing devices 19 and 20 including a pair of left and right tapered roller bearings. These two small gear rolling bearing devices 19 and 20 are arranged symmetrically with respect to the small gear 15, but have the same specifications.

In such a bearing device for a driving device,
A lubricating oil reservoir 2 is provided below the rolling bearing device 18 for the large gear.
The lubricating oil reservoir 22 has a large gear 1.
Part of 3 is immersed. Thus, a so-called droplet lubrication system is formed in which the lubrication of the small gear bearing devices 19 and 20 is performed by the lubricating oil that has been scraped up from the lubricating oil reservoir 22 by the large gear 3 during vehicle operation.

In this embodiment, the rolling bearing devices 19 and 20 for small gears are tapered roller bearings as shown in an enlarged view in FIG. 2, and the tapered roller bearings are provided between an outer ring 23, an inner ring 24, and these outer and inner rings. It comprises a number of tapered rollers 25 interposed and a retainer 26 for holding the tapered rollers 25.

A circumferential groove 28 is formed over the entire circumference at the large diameter non-track portion on the inner circumferential surface side of the outer ring 23.
An annular elastic member 29 made of rubber or the like is fitted in the inside to form a lubricating oil reservoir. This elastic member 29
Since the roller is disposed in the circumferential groove prior to the assembly of the bearing, the tapered roller 25 as a rolling element at the time of assembling the bearing must move over the elastic member 29. Therefore, the hardness of the elastic member 29,
The thickness and height need to be selected so as not to hinder the operation.

According to the present embodiment, since the lubricating oil reservoir is formed on the outer ring 23 side of the rolling bearing for the small gear due to the presence of the elastic member 29, the rolling bearing for the small gear can be used even when the operation is stopped such as when the vehicle is stopped. The lubricating oil is retained in the lubricating oil, and this lubricating oil enables the initial lubrication at the start of operation, and the small gear bearing continuously moves from the lubricating oil reservoir 22 provided below the large gear bearing to the large gear 13. Is lubricated by splash lubrication that is picked up by the rotation of.

FIG. 3 is a central sectional view of a second embodiment of the present invention. The tapered roller bearing according to the second embodiment includes an outer ring 2.
3, an inner ring 24, a number of tapered rollers 25 interposed between the outer and inner rings, and a retainer 26 for holding the tapered rollers 25. Even in the second embodiment, the outer ring Although the circumferential groove 28 is formed over the entire circumference also on the large-diameter non-track portion on the inner circumferential surface side, as in the first embodiment, the circumferential groove 28 is formed in the second embodiment. An O-ring 39 is mounted inside to form a lubricating oil reservoir.

The operation of the second embodiment is the same as that of the first embodiment.

[0017]

According to the present invention, in a rolling bearing device for a small gear of a drive unit for a railway vehicle, a sufficient supply of lubricating oil at the start of operation becomes possible, and the small gear bearing can be provided even after the vehicle operation is stopped such as when the vehicle is stopped. But there is no lack of lubrication. ADVANTAGE OF THE INVENTION According to this invention, even if it is in a cold region, it becomes possible to prevent the possibility of seizure due to poor lubrication of the small gear bearing at the start of vehicle operation.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a bearing device for a railway vehicle drive device employing the present invention.

FIG. 2 is a center cross-sectional view of a small gear bearing device of the railway vehicle drive device according to the first embodiment of the present invention.

FIG. 3 is a central sectional view of a small gear bearing device of a railway vehicle drive device according to a second embodiment of the present invention.

FIG. 4 is a central sectional view of a conventional example of a small gear bearing device of a railway vehicle drive device.

[Explanation of Signs of Main Parts]

 Outer ring 23 Inner ring 24 Circumferential groove 28 Elastic member 29

Claims (1)

[Claims] 1. A small-diameter non-track surface portion of an inner peripheral surface of an outer race of a tapered roller bearing for a small gear, which is provided on a rotary drive side and meshes with a large gear fixed to an axle, is provided with a circumferential groove. A rolling bearing device for a railway vehicle drive device, wherein an elastic member for retaining lubricating oil is provided in the groove.