JPH07308043A - Bearing box of rotating electric machine - Google Patents

Abstract

(57) [Summary] [Objective] To provide a bearing box structure with a grease supply mechanism that can ensure effective lubrication with a more appropriate amount of grease by providing a grease injection pipe or grease injection guide plate on the inner bearing cover. [Effect] A grease injection pipe or grease injection guide plate is provided on the inner bearing cover. Also, by providing the rotor with a grease guide collar, it is possible to reliably supply grease to the lubrication part of the rolling bearing and to accurately supply the injected amount, so a highly reliable bearing housing that enhances the lubrication effect of the rolling bearing can be provided. Can be provided. Furthermore, even when a compact automatic lubricator that supplies a small amount of grease to the grease inlet at regular intervals is connected, the grease is reliably supplied to the lubrication part of the rolling bearing. Enables simplified maintenance used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing box structure for reliably and effectively lubricating a rolling bearing that supports a rotor of a rotary electric machine.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to the drawings. FIG. 4 shows a structure of a bearing portion of a conventional rotating electric machine. In rotating electric machines, rolling bearings 1 are used to support the rotor.
This rolling bearing 1 is fixed to the rotor shaft 2 by using a bearing washer 3 and a bearing nut 4, and its outer ring is held by a bearing housing 5 and fixed to the stator frame side. Generally, the rolling bearing 1 is of a shield or seal type in which the space volume of the bearing is shut off from the outside and lubricating grease is enclosed therein, or an open type in which the space volume of the rolling bearing is open to the outside. There are two types.

This open type rolling bearing has to be replenished with grease for its lubrication if necessary, and therefore the inside of the rolling bearing 1 is fixed axially or protected from dust. The bearing cover 6 and the outer bearing cover 7 are respectively provided with a notch 12 for grease injection, a grease injection port 8 and a grease injection passage 10 to supply grease from the outside. Further, when this grease becomes excessive, it is structured to be discharged from the grease discharge port 9.

[0004]

However, in the above-mentioned structure, the inner bearing cover pocket 13 has a large space volume, and new grease is obstructed by old grease stagnant in the inner bearing cover pocket even if grease is replenished. The rolling bearing 1 cannot be reached. When an automatic lubricator is used, a small amount of grease for optimum lubrication, which is supplied at certain intervals, does not reach the rolling bearing 1, and both impede the lubrication of the rolling bearing 1 due to poor lubrication of the rolling bearing 1. 1
Sometimes shortened the life of the.

Therefore, an object of the present invention is to provide a bearing box structure provided with a grease injection pipe or a grease injection guide plate on the inner bearing cover and provided with a grease supply mechanism capable of surely performing effective lubrication with a more appropriate amount of grease. There is a thing.

[0006]

The bearing box structure of the present invention comprises:
A grease injection pipe or grease injection guide plate is provided on the circumference of the inner bearing cover at a certain position, and grease injected from the outside passes through the pipe or is guided to the guide plate to reliably supply to the inner ring rolling surface of the rolling bearing. It is configured to be done.

[0007]

[Function] By providing a grease injection pipe or a grease injection guide plate on the inner bearing cover, the space volume of the grease injection path can be reduced and the flow of the injected grease can be more controlled, and the injection amount and the grease actually used for lubrication can be reduced. It is possible to grasp the quantity. Further, it is possible to more reliably supply the lubricant to the lubrication portion, and the grease lubrication can be optimized.

[0008]

EXAMPLE A first example of the present invention (corresponding to claim 1) will be described below.
1 for the second embodiment, FIG. 2 for the second embodiment (corresponding to claim 2), and FIG. 3 for the third embodiment (corresponding to claim 3). However, the same parts as those in FIG.

In FIG. 1, if a casting material is cast into the inner bearing cover 15 at the time of manufacturing, a plurality of pipes are radially provided as the grease injection pipe 16. The grease outlet, which is the small-diameter side outlet of the grease injection pipe 16, is positioned aiming at the gap between the inner ring 17 of the rolling bearing 1 and the cage 18. In addition, the grease injection pipe 16
A passage is provided in the axial direction so as to communicate with the grease injection passage 11 provided in the bearing housing 5.

When grease is injected from the grease injection port 8 provided in the outer bearing cover 7, the grease is supplied to the rolling surface of the inner ring 17 of the rolling bearing 1 through the grease injection passage 11 and the grease injection pipe 16. , Rolling bearing 1
With the rotation of the grease, grease reaches the entire inside of the rolling bearing 1 and reaches an appropriate lubrication state. At this time, the space volume of the grease flow path is equal to that of the conventional inner bearing cover pocket 1.
3 small The route is guided by a pipe.
Therefore, the flow of grease can be controlled, and the supplied grease reliably reaches the inside of the rolling bearing and effectively acts on lubrication.

Further, in FIG. 2, a substantially cylindrical plate-like grease injection guide plate 21 is attached in contact with the inside of the space volume portion of the inner bearing cover 19 provided with a plurality of grease guide grooves 19 in a radial direction, and the grease injection 1 shows a bearing box structure in which a grease injection path is formed such that the outlet is located in the gap between the inner ring 17 of the rolling bearing 1 and the cage 18. The grease injection route is the same as in FIG.
The grease whose flow is controlled by the grease guide groove 19 and the grease guide groove 19 is surely supplied to the bearing rolling portion and effectively acts on lubrication.

Further, referring to FIG. 3, in the bearing box structure having the configuration of FIG. 1 or 2, when the grease injection pipe 16 or the grease guide groove 19 cannot be provided in a plural number or a sufficient number, the rolling bearing 1 and the inner bearing can be provided. The outer diameter of the rolling bearing on the inner ring side is set to be substantially the same as the outer diameter of the inner ring between the covers. Alternatively, by supplying a tapered grease guide collar 22 to the rotor shaft so that the outer diameter on the side in contact with the rolling bearing 1 becomes large, the injected grease can be more evenly supplied to the inside of the rolling bearing 1. This is a possible bearing box structure.

[0013]

As is apparent from the above description, the present invention has the following advantages.
Install a grease injection pipe or grease injection guide plate on the inner bearing cover. Also, by providing the rotor with a grease guide collar, it is possible to reliably supply grease to the lubrication part of the rolling bearing and to accurately supply the injected amount, so a highly reliable bearing housing that enhances the lubrication effect of the rolling bearing can be provided. Can be provided. Furthermore, even when a compact automatic lubricator that supplies a small amount of grease to the grease inlet at regular intervals is connected, the grease is reliably supplied to the lubrication part of the rolling bearing. Enables simplified maintenance used.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view of a bearing box structure showing a first embodiment of the present invention,

FIG. 2 is a partially cutaway sectional view of a bearing box structure showing a second embodiment of the present invention,

FIG. 3 is a partially cutaway sectional view of a bearing box structure showing a third embodiment of the present invention,

FIG. 4 is a partially cutaway sectional view showing a structure of a bearing portion of a conventional rotary machine.

[Explanation of symbols]

1 …… Rolling bearing, 6,15,20 ……
Inner bearing cover, 13 ... Inner bearing cover pocket,
14 ... Outer bearing cover space, 16 ... Grease injection pipe, 17 ... Inner ring, 18 ... Retainer,
19 ... Grease guide groove, 21 ... Grease injection guide plate, 22 ... Grease guide collar.

Claims (3)

[Claims] 1. The inner bearing cover is provided with a plurality of radial grease injection pipes, and the outlet on the small diameter side is aimed at the gap between the inner ring of the rolling bearing and the cage to control the grease flow and to remove the grease. A bearing box for a rotary electric machine, which can be injected into the lubrication part of a rolling bearing. 2. A substantially cylindrical grease injection guide plate is attached in contact with the inner side wall in the space volume portion of the inner bearing cover having a plurality of radial grease guide grooves, and the outlet of the injected grease is held with the inner ring of the rolling bearing. A bearing box for a rotary electric machine, characterized in that a grease injection path is formed so as to be located in a gap between the containers. 3. The bearing box structure according to claim 1 or 2, wherein a tapered grease guide collar is provided between the rolling bearing and the inner bearing cover, and the grease is guided to the lubrication portion of the rolling bearing. box.