JPS63186034A - Bearing device - Google Patents

Abstract

PURPOSE:To keep an effect of lubrication stably in a long term by making the grease chamber of an end cover larger than the outside diameter of the outer ring of a rolling bearing, and thereby enabling charging of a large amount of grease. CONSTITUTION:A wall surface 23a, which is the bottom of the channel 24 of each rib 23, is constructed to be an inclined face which is lowered toward the center of a rotary shaft 11 from a horizontal face. In the grease chamber 21 of this end cover 14, each channel 24 extends more than the outside diameter d2 of the outer ring 15 of a rolling bearing 13. The base oil separated from grease G flows, therefore, down to a circular space 22 along each rib 23. The plural ribs 23 for partitioning the outer peripheral part of the grease chamber 21 hold the grease G stably. The base oil of the grease is thus supplied to the inner part according to rotation of rolling bearing 13, effecting lubrication in a long term.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a bearing device.

(Prior Art) For example, as a bearing device for a vehicle main electric motor (hereinafter referred to as a motor), the ones shown in FIGS. 6 and 7 are conventionally known. In this bearing device, a rotating shaft 3 is supported by a rolling bearing 2 housed in a bearing bracket 1, which is a fixed member of the motor. The outer ring 4 of this rolling bearing 2 is held down in the axial direction by an end cover 5, and the inner ring 6 of the rolling bearing 2 is held down from both sides by collars 7.8.

An annular grease chamber 9 is formed on the side surface of the bearing bracket 1 on the rolling bearing 2 side, and is filled with lubricating grease. Similarly, an annular grease chamber 10 is formed on the side surface of the end cover 5 on the rolling bearing 2 side, and is filled with lubricating grease. These grease'i! 9.1
The base oil valve separates the grease filled in the inside of the rolling bearing 2 little by little and supplies it to the rotating part inside the rolling bearing 2, thereby lubricating the rolling bearing 2.

By the way, if the motor continues to be operated, the base oil content of the lubricating grease will gradually be consumed and deterioration such as oxidation will occur.
Since the lubrication ability decreases, the grease must be replaced with new grease. In addition, recent motors are being used at high speeds to reduce the size and damage, and the base oil content of the lubricating grease on the bearings tends to wear out and deteriorate more rapidly, making it necessary to shorten the interval between grease renewals. ing.

On the other hand, in recent years, there has been a demand to extend the grease renewal period to a longer period than before in order to save labor in maintenance.

Due to these conflicting demands, various studies are being conducted to extend the renewal period of lubricating grease for bearings. An example of this is in the bearing device shown in FIGS. 6 and 7, in which the outer diameter of the grease chamber 10 formed inside the end cover 5 is increased, and the width dimension W is also increased.
This increases the volume of grease m to be filled. The lower bottom part 10a of this grease chamber 10 is set at approximately the same height as the lower part of the inner diameter d of the outer ring 4 of the 1h11 bearing 2, so that the base oil that separates from the filled grease and collects on the lower side of the bearing 2 It is easy for it to flow into the inside of the body.

By increasing the amount of grease filling h74 in this manner, it is possible to lengthen the supply time Ii of the base oil that is supplied separately from the grease, thereby extending the grease renewal period.

(Problem to be solved by the invention) However, in the conventional bearing part with such a structure, J
3, it was difficult to significantly extend the grease renewal period due to the following problems.

First, when the outer diameter and width W of the grease chamber 1o of the end cover 5 are increased to increase the amount of grease filled, the weight ratio of the grease itself increases compared to the area in contact with the inner wall of the grease chamber 10. In addition, the filled grease tends to crumble due to vibrations during operation. This tendency is particularly noticeable in motors such as vehicular traction motors, which generate large vibrations during operation and also have high bearing temperatures.

When the filled grease breaks down, the grease flows into the rotating parts of the bearing 2 and is agitated, causing abnormal temperature and softening, leading to premature deterioration of the grease, leakage due to softening, and wear and tear.

Second, since the end cover 5 needs to hold down the bearing outer ring 4 in the axial direction, the outer diameter of the grease 10 cannot be larger than the bearing outer diameter d2. Due to limitations in the main motor, it is difficult to significantly increase the power consumption.

Because of these factors, the volume of the grease amount 10 cannot be significantly increased, and the increase in the amount of grease to be filled is also restricted, making it impossible to significantly extend the grease renewal period.

In view of these conventional problems, it is an object of the present invention to provide a bearing device that can increase the amount of grease filled and significantly extend the grease renewal period.

[Structure of the Invention] (Means and Effects for Solving the Problems) The bearing device of the present invention is characterized in that the outer diameter of the grease chamber formed in the end cover is larger than the outer diameter of the bearing. In addition to significantly increasing the amount of grease, a plurality of ribs are provided to partition the outer periphery of this grease chamber, and the outer ring of the bearing is held down by these ribs.

By making this +i'i iTh, it is possible to significantly increase the amount of filled grease, and the filled grease can be stably held by multiple ribs, maintaining a stable lubrication effect for a long period of time. It becomes possible to do so.

(Example) Hereinafter, embodiments of the present invention will be explained in detail based on the drawings.

FIGS. 1 and 2 show an embodiment of the present invention, in which a rotating shaft 11 of a motor such as a main electric motor for a vehicle is supported by a bearing bracket 12 via a rolling bearing 13. FIG.

An end cover 14 is attached to the side surface of the rolling bearing 13 to support the outer ring 15 of the rolling bearing 13. Also, a collar 16 attached to the inner circumference of the bearing bracket 12. Each collar 17 attached to the inner circumference of the end cover 14 supports the inner ring 18 of the rolling bearing 13 in the axial direction.

An annular grease ff20 is formed on the side surface of the bearing bracket 12 on the rolling bearing 13 side.

A grease chamber 21 is also formed on the side surface of the end cover 14 on the rolling bearing 13 side. This grease chamber 21
includes an annular space 22 having an outer shape approximately equal to the rotating portion of the rolling bearing 13, and a plurality of ribs 23.23. . . and communicates with the annular space 22. and,
Wall surface 23a of each rib 23 that touches the bottom of the partition 24
is an inclined surface that extends downward toward the center of the rotating shaft 11 with respect to the horizontal plane. Therefore, in the grease v21 of this end cup \-14, each partition chamber 24 extends further outward than the outer diameter d2 of the outer ring 15 of the rolling bearing 13, and each rib 23 presses the outer ring 15 in the axial direction. Become.

The lowest part 21a of the grease chamber 21 is formed to be at approximately the same height as the lower part of the inner diameter d1 of the outer ring 15 of the rolling bearing 13, and the base oil valve separated from the grease is inside the rolling bearing 13. They are being distributed to ensure smooth supply.

The operation of the bearing device configured as described above will be explained next.

When the rotating shaft 11 rotates, the inner ring 1 of the rolling bearing 13
8 rotate together, the internal rotating part reduces rotational friction resistance,
The rotating shaft 11 is rotatably supported by the bearing bracket 12.

As the inner ring 18 and the rotating portion rotate with the rotation of the rotating shaft 11, the outer ring 15 of the rolling bearing 13 is held down by a plurality of ribs 23, 23, . . . of the end cover 14.

The base oil valve is separated from the grease filled in the grease chamber 20 of the bearing bracket 12 and the grease chamber 21 of the end cover 14 as the rolling bearing 13 rotates, and is supplied to the rotating parts to ensure smooth rotation. become.

To explain this lubricating effect in more detail, as shown in FIG. Each rib 23, 23. It flows down into the annular space 22 along the wall surfaces 23a, 23a, and so on, and is supplied to the inside of the rolling bearing 13.

Additionally, a plurality of ribs 23 partition the outer periphery of the grease chamber 21.
This stably holds the grease G filled in each partition 24 and prevents it from collapsing due to vibrations during operation. Further, the base oil valve of the grease flowing down from each partition cavity 24 and the annular space 22 is collected in the lowest part 21a, and is supplied therein with the rotation of the rolling bearing 13 to provide lubrication.

In this way, in the case of the bearing device of this embodiment, the partition 24 of the grease chamber 21 on the end cover 14 side is formed so as to expand outward beyond the outer diameter d2 of the outer ring 15 of the rolling bearing 13. It is possible to fill a larger amount of grease in the conventional grease chamber 10 as shown in FIG. 6, and moreover, it is possible to stably hold that large amount of grease.

Note that when the bearing device having the above configuration is used as an intermediate oil supply type, a oil supply nipple 25 is provided on the bearing bracket 12 as shown in FIG.
The oil supply hole 26a communicates with 0.

26b.

When filling with grease, at the beginning of operation, the grease chamber 2 on the end cover 14 side is
1, only the annular space 22 is filled with grease G, and each partition chamber 24, 24, . Do not fill the parts marked with ....

Then, as the operation progresses and the base oil valve of the filled grease G becomes worn out or deteriorated, new grease is supplied to the grease chamber 20 from the oil supply nipple 25.

With this replenishment, old grease is removed as shown in Figure 5.
During rotation, the inside of the bearing 13 is discharged into the annular space 22 of the grease chamber 21 on the end cover 14 side, and is further discharged into the annular space 22.
The grease that has been filled from the beginning into the partition chamber 24.2
4. It is pushed out and stored in...

Therefore, this partition 24.24. It is possible to replenish the grease several times until it becomes full of old grease.

In the first and second embodiments, the ribs 23, 23, . . . are provided on the outer periphery of the grease chamber 21 of the end cover 14.
Although an inclined surface is formed in order to facilitate the flow of the base oil component of the grease, the present invention is not particularly limited to the above-described embodiment.

Therefore, in the case where the axis of rotation is set in the vertical direction, the ribs can be formed radially to increase the space filled with grease and to stably hold a large amount of grease.

[Effects of the Invention] According to this invention, since the grease chamber of the end cover is made larger than the outer diameter of the outer ring of the rolling bearing, it is possible to fill a large amount of grease, and by forming the ribs, Since the grease chamber is separated into a plurality of partitioned chambers, a large amount of grease can be stably held and a stable lubrication effect can be maintained for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of one embodiment of the present invention, FIG. 2 is a cross-sectional view of FIG. is a sectional view showing another embodiment of the present invention, FIG. 5 is a sectional view explaining the fIJ operation of the above embodiment, FIG. 6 is a sectional view of a conventional example, and FIG. It is a sectional view taken along the line Vl. 11... Rotating shaft 12... Bearing bracket 13... Rolling bearing 14... End cover 15... Outer ring 20... Grease chamber 21... Grease chamber 22... ...Annular space 23...Rib 23a...Wall surface 24...To partition

Claims (2)

[Claims] (1) A rotating ring is supported by a rolling bearing housed in a bearing bracket, an end cover is attached to the side surface of the rolling bearing so as to cover the rolling bearing, and the inner side of the end cover is larger than the outer diameter of the rolling bearing. A wide, generally annular grease chamber is formed, and a plurality of ribs are arranged in the grease chamber to partition the outer periphery of the grease chamber into a plurality of partition chambers, and each of the ribs presses the outer ring of the rolling bearing in the axial direction. Bearing device. (2) The rotating shaft is supported horizontally, and the plurality of ribs, which correspond to the bottom of each partition chamber of the grease chamber, are inclined in a downward direction toward the shaft center with respect to the horizontal direction. A bearing device according to claim 1, characterized in that: