JPH09100899A - Gearing for electric vehicles - Google Patents

Abstract

(57) Abstract: It is an object of the present invention to provide a gear device in which bearing burnout does not occur even when rotating at a high speed, and to eliminate a driving accident of an electric vehicle. SOLUTION: An L-shaped guide plate is provided in the center of the lower surface of the central portion of the inspection lid located above the small gear above the gear box in the width direction of the gear, and both lower ends of the guide plate are provided on both bearing lids. It is formed to extend to the top of each pocket. Also, an inverted L-shaped guide plate is symmetrically provided on the back surface of the guide plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-side lubrication type gear device including a large gear and a small gear, and to a gear device for an electric vehicle with a small gear bearing oil supply device.

[0002]

2. Description of the Related Art An example of a conventional oil-side lubrication type electric vehicle gear device will be described with reference to FIGS. 5 is a longitudinal sectional view of the main part of the apparatus, and FIG. 6 is a sectional view taken along the line AA of FIG. The large gear 1 is fitted to the axle 1a through a bearing and a bearing lid (not shown) provided on the axle, and the small gear 2 is provided on both side surfaces of the gear, and the axles 5 and 55 and the bearing lid 6 are provided. , 66 to be supported by the gear box 3. Lubricating oil 7 is stored in the gear box 3 up to a predetermined level surface 7a. This surface is located below the bearings of the large and small gears. Lubrication of the bearings 5 and 55 of the small gear is such that the lubricating oil scraped up by the teeth of the large gear 1 directly comes down, and the lubricating oil receiving pockets 6a and 66a provided in the bearing lids 6 and 66 to the bearing lids 6 and 66.
Some of them flow into the spaces 5b and 55b between the inside of the bearing and the bearings 5 and 55 to be refueled.

[0003]

In the conventional gear device, in the rotation in the direction B in FIG. 5 where the path of the lubricating oil is carried by the teeth of the large gear to the small gear is long, part of the lubricating oil is in the gear. It is transmitted to the inner wall of the gear box by the pump action and returns through the C path, so that the amount injected from the pocket is not contributed to lubrication of the small gear bearing. When rotating at high speed in such a state, the lubrication oil supply amount was insufficient, and the bearings 5 and 55 sometimes suffered bearing burnout due to poor lubrication. The present invention has been devised in view of such points,
It is an object of the present invention to provide a gear device in which bearing burnout does not occur even when rotating at high speed, and to prevent an operating accident of an electric vehicle. In the case of anti-B-direction rotation, the path through which the lubricating oil is conveyed to the small gear by the teeth of the large gear is short, so a sufficient amount of lubricating oil is supplied to the small gear as compared with B-direction rotation.

[0004]

In order to achieve the above object, in the gear device of the present invention, an L-shaped guide plate is provided in the center of the central lower surface of the inspection lid located above the small gear above the gear box. The width direction of the guide plate, and the lower ends of the guide plate are formed so as to extend to the upper portions of the pockets provided in the both bearing lids. An inverted L-shaped guide plate is symmetrically provided on the back surface of the guide plate.

[0005]

When the gear meshes in the downward B rotation, the lubricating oil scattered along the inner wall of the outer circumference of the gear box collides with the upper part of the guide plate 4a provided on the inspection lid 4 and falls, and the lower part of the guide plate. It is injected into the pockets 6a and 66a provided in the bearing lids 6 and 66 above the bearings 5 and 55 by the bent L-shaped gutter, and the bearings 5 and 55 are lubricated from the space portions b and 66b. That is, the bearing is lubricated by combining with the one directly contacting the bearing. When the gear meshes with BB rotation, the inverted L-shaped guide plate 4b symmetrically provided on the back surface of the guide plate 4a provides more effective lubrication.

[0006]

EXAMPLES Examples will be described with reference to FIGS. An L-shaped guide plate 4a is provided in the width direction of the gear at the center of the lower surface of the inspection lid 4 located above the small gear 2 above the gear box 3, and the lower ends of the guide plate are provided at the bearing lids 6, 66. The pockets 6a and 66a are formed so as to extend to the upper portions. When the gear of the gear unit rotates in the B direction, the large gear 1
Teeth carry the lubricating oil 7 to the upper part of the small gear 2 in the direction B, and the carried lubricating oil 7 splashes on the small gear, and a part of it splashes on the bearings 5, 55, thus lubricating the bearing. Contribute to. (However, the contribution ratio is smaller than in the case of rotation in the anti-B direction.) In addition, the guide plate 4a of the oil supply device according to the present invention.
Guides the lubricating oil carried by the teeth of the large gear 1 to the pockets 6a and 66a provided in the bearing lids 6 and 66, which has not conventionally contributed to bearing lubrication by passing through the C direction on the small gear. Then, the bearings 5 and 55 are more surely supplied with lubricating oil. As a whole, sufficient lubricating oil is supplied to the bearing.

Another embodiment will be described with reference to FIG. The L-shaped guide plate 4 is very effective when the large gear 1 is rotated in the B direction, but when the large gear 1 is rotated in the anti-B direction, that is, in the BB direction, the lubricating oil that hits the back surface of the L-shaped guide plate 4 is released. It will be injected into the respective pockets 6a and 66a, but it is not effective because there is no gutter. Therefore, the inverted L-shaped guide plate 4b is provided symmetrically on the back surface of the guide plate 4a.

[0008]

As described above, according to the present invention, the lubricating oil can be more efficiently supplied to the small gear bearing, so that the small gear bearing is burned out due to poor lubrication in the left and right high speed rotation of the gear device. It will not occur and the driving accident of the electric vehicle can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a gear device showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view of a main part of another embodiment.

FIG. 4 is a perspective view of a main part in which a guide plate is attached to the inspection lid in FIG.

FIG. 5 is a longitudinal sectional view of a main part showing a conventional gear device.

FIG. 6 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

1 large gear 1a axle 2 small gear 2a small gear shaft 3 gear box 4 inspection lid 4a L-shaped guide plate 4b inverted L-shaped guide plate 5 bearing (counter input shaft side) 55 bearing (input shaft side) 6 bearing cover (counter input) Shaft side 66 Bearing lid (input shaft side) 6a Pocket (lubricating oil receiver, counter input shaft side) 6b Space (counter input shaft side bearing lid 6 and bearing 5)
66a Pocket (lubricating oil receiver, input shaft side) 66b Space (inner side of input shaft side bearing cover 66 and bearing 55)
7) Lubricating oil 7a Lubricating oil surface B Solid line arrow Large / small gear rotation direction BB Dashed line arrow Large / small gear rotation direction C Lubricating oil Large gear tooth pumping path: Large gear B direction rotation CC Lubricating oil large gear tooth Drawing route by: Rotation of large gear CC direction A-A Cutting line

Claims (2)

[Claims] 1. In an electric vehicle gear device, an L-shaped guide plate (4a) is provided in the center of the lower surface of an inspection lid (4) located above the small gear (2) above the gear box (3). Direction, the lower ends of the guide plate are provided with bearing lids (6),
The pockets (6a) and (66a) provided in (66) are formed so as to extend to the upper portions. A gear device for an electric vehicle configured as described above. 2. The gear device for an electric vehicle according to claim 1, wherein an inverted L-shaped guide plate (4b) is symmetrically provided on the back surface of the guide plate (4a) according to claim 1.