JPH05332366A - Bearing device - Google Patents

Abstract

PURPOSE:To easily supply a lubricant such as grease and further to prevent causing a lubricant stain due to infiltrating dust. CONSTITUTION:A rotary shaft 1 is supported through a rolling bearing 3 housed in a bearing bracket 2, and an end cover 15 is mounted on the bearing bracket 2 so as to cover a side surface of the rolling bearing 3. In this end cover 15, an annular grease chamber 16 is provided in a side surface in a side of the rolling bearing 3, a grease reservoir chamber 17 is provided in one or a plurality of parts to communicate with the periphery of this annular grease chamber 16, a filter chamber of communicating with the grease reservoir chamber 17 through an opening part of small area is formed in the grease reservoir chamber 17, and a sponge like porous filter 19 is inserted to the inside of this filter chamber so as to cover an opening part of a communication port 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device.

[0002]

2. Description of the Related Art For example, as a bearing device for a vehicle main electric motor (hereinafter referred to as a motor), a bearing device having a structure shown in FIG. That is, the rotating shaft 1 of the motor
Are supported via rolling bearings 3 housed in the recesses of the bearing bracket 2.

An end cover 4 shown in FIG. 6 is attached to the bearing bracket 2 via a bolt (not shown) on the side surface of the rolling bearing 3 to support the outer ring 5 of the rolling bearing 3. Also, the bearing bracket 2
The collar 6 attached to the inner peripheral portion of the roller 6 and the collar 7 attached to the inner peripheral side of the end cover 4 respectively support the inner ring 8 of the rolling bearing 3 in the axial direction.

On the other hand, an annular grease chamber 9 is formed on the side surface of the bearing bracket 2 on the rolling bearing 3 side.
An annular grease chamber 10 is also formed on the side surface of the end cover 4 on the rolling bearing 3 side.

The outer peripheral portion of the annular grease chamber 10 communicates with a grease reservoir chamber 11 formed at one or a plurality of locations as shown in FIG. Reference numeral 4a in FIG. 6 indicates a through hole for a bolt to be attached to the bearing bracket 2.

By the way, when the bearing device having the above-described structure is filled with grease, the grease (indicated by a symbol G) is filled only in the annular grease chamber 10 at the beginning of the operation as shown in FIG. The grease reservoir chamber 11 is not filled.

Then, when the operation has passed and the base oil component of the filled grease has been consumed and deteriorated, new grease is supplied from the oil supply nipple 12 to the annular grease chamber 9 of the bearing bracket 2. The newly replenished grease passes from the inside of the rolling bearing 3 through the annular grease chamber 10 of the end cover 4 to push out the old grease filled therein to the grease reservoir chamber 11.

However, the air in the grease reservoir 11 is
If there is no discharge area, that is, there is no other escape place, the grease is compressed by the movement to the grease storage chamber 11, causing an effect of hindering the movement of the grease, and it becomes difficult for the grease to enter the grease storage chamber 11, and the end cover 4 and the collar. There is a risk of leakage to the outside from the labyrinth 13 constituted by 7. Therefore, a communication hole 14 communicating with the outside of the grease storage chamber 11 is provided and an escape area for air is provided to facilitate the movement of the grease to the grease storage chamber 11.

[0009]

However, when the communication hole is provided as described above, the communication hole communicates the outside with the grease storage chamber, so that dust from the outside enters the grease storage chamber and the annular grease chamber. It is easy to do so, and this causes grease stains and adversely affects the rolling bearing.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a bearing device which facilitates replenishment of a lubricant such as grease and which does not cause lubricant contamination due to intrusion of dust.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a frame body for accommodating a rolling bearing and supporting a rotating shaft, and a rolling body mounted on the frame body so as to cover the rolling bearing. The bearing side is provided with an annular lubricant chamber and an end cover formed with a lubricant discharge chamber that communicates with the outer periphery of the bearing, and the frame body is provided with a communication hole that communicates the lubricant discharge chamber with the outside. In a bearing device in which the lubricant is replenished from the end surface of the rolling bearing, a porous filter is provided so as to cover the inside of the communication hole or the opening on the lubricant discharge chamber side.

[0012]

The dust that has entered from the outside through the communication hole is removed by the porous filter, so that it can be prevented from being contaminated by being mixed with the lubricant. In addition, since the lubricant discharge chamber and the outside communicate with each other through the communication hole and the porous filter,
When the lubricant is replenished, the pressure of the air in the lubricant discharge chamber does not rise, and the lubricant can be replenished smoothly.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a main part of an embodiment of the present invention, and FIG. 2 shows an end cover used in the embodiment of the present invention shown in FIG. 1 and 2, 1 is a rotary shaft, 2 is a bearing bracket, 3 is a rolling bearing, and 5 is a rolling bearing.
Is an outer ring of the rolling bearing 3, 6 and 7 are collars, 8 is an inner ring of the rolling bearing 3, 9 is an annular grease chamber, 12 is an oil supply nipple, 14 is a communication hole, and 15 is attached to the bearing bracket 2 via a bolt not shown. It is an end racket that presses the outer ring 5 of the rolling bearing 3.

The end cover 15 has an annular grease chamber 16 similar to the above-described annular grease chamber 10 on the side surface on the rolling bearing 3 side, and one or more places communicating with the outer peripheral portion of the annular grease chamber 16. The grease storage chamber 17 similar to the above-mentioned grease storage chamber 11 formed in the above, and is communicated with this grease storage chamber 17 through the opening 18a having a small opening area, and when the bearing bracket 2 is attached, the communication hole 14 is formed. The filter chamber 18 is also provided so as to communicate with each other. The surface of the filter chamber 18 on the bearing bracket 2 side is partitioned by the bearing bracket 2 as shown in FIG. In addition, a porous filter 19 such as a sponge is inserted into the filter chamber 18 so as to cover the opening of the communication hole 14. Reference numeral 20 in FIG. 2 indicates a through hole of a bolt for mounting the bearing bracket 2.

In the bearing device using the end cover 15 constructed as described above, the filter chamber 18 communicates with the communication hole 14 through the porous filter 19, and the filter chamber 18
Communicates with the grease storage chamber 17 through the opening 18a. That is, the grease storage chamber communicates with the outside through the opening 18a, the filter chamber 18, the porous filter 19 and the communication hole 14. Therefore, when new grease is replenished through the oil supply nipple 12, the old grease passes from the inside of the rolling bearing 3 through the annular grease chamber 16 and the grease reservoir chamber.
Although it is pushed out (exhausted) to 17, the air in the grease chamber 17 escapes (exhausts) to the outside by that amount, so the pressure increase of the air in the grease reservoir chamber 11 does not occur,
It does not hinder the transfer of old grease. On the other hand, dust that has entered from the outside through the communication hole 14 is removed by the porous filter 19 because the opening of the communication hole 14 is covered with the porous filter 19, and enters the grease reservoir chamber 17. do not do. As a result, the grease is not contaminated by dust, and the rolling bearing 3 is not adversely affected. The porous filter 19 is replaced with a new one when the motor is regularly inspected.

In the above-described embodiment (hereinafter referred to as the first embodiment), the grease storage chamber of the end cover 15 is externally applied.
Although the porous filter 19 is provided in the filter chamber 18 formed in the end cover 15 in order to remove dust that enters the 17, it may be provided in the bearing bracket. Figure 3
FIG. 4 is a cross-sectional view showing a main part of another embodiment (hereinafter referred to as a second embodiment) of the present invention having such a configuration. That is, in the figure, reference numeral 21 is a bearing bracket that houses the rolling bearing 3 and supports the rotating shaft 1.

This bearing bracket 21 is similar to the above-mentioned conventional bearing bracket 2 in rolling bearing 3.
Is accommodated in a recess, and an annular grease chamber 22 similar to the above-described conventional annular grease chamber 9 and the above-described conventional communication hole 14 are provided.
A communication hole 23 similar to the above is provided, and at the end portion of the communication hole 23 on the end cover 4 side, a circular shape having an area larger than the area of the communication hole 23 or another appropriate shape and one outside (upper side in the figure) A filter chamber 24 is formed so that its portion is outside the grease reservoir 11 of the end cover 4, and a porous filter 25 such as a sponge is inserted into the filter chamber 24 so as to cover the opening of the communication hole 23. To do.

In the bearing device using the bearing bracket 21 configured as described above, one end of the communication hole 23 communicates with the outside and the other end communicates with the grease reservoir of the end cover 4 through the porous filter 25. ing. Therefore, as in the case of the first embodiment described above, when new grease is replenished through the oil supply nipple 12, the pressure increase of the air in the grease reservoir chamber 11 of the end bracket 4 does not occur, and the communication hole from the outside is not generated. The dust that has entered through 23 is removed by the porous filter 25 and does not cause grease contamination. The porous filter 25 is replaced with a new one at the time of periodic inspection of the motor, like the porous filter 19 of the first embodiment described above.

Further, in the second embodiment described above, one end of the communication hole 23 is opened to the outside, but it may be opened to the labyrinth formed by the bearing bracket and the collar.
FIG. 4 is a cross-sectional view showing a main part of another embodiment (hereinafter, referred to as a third embodiment) of the present invention having the above-described structure. That is, in the figure, 26 is the rolling bearing 3
Is a bearing bracket that accommodates and supports the rotating shaft 1.

This bearing bracket 26 is similar to the above-mentioned conventional bearing bracket 2 in that the rolling bearing 3
In the concave portion, and an annular grease chamber 27 similar to the above-described conventional annular grease chamber 9 and a labyrinth 28 formed by the bearing bracket 26 and the collar 6 at one end and the grease of the end cover 4 at the other end. A communication hole 29 opening to the reservoir chamber 11 is provided, a filter chamber 30 similar to the filter chamber 24 of the second embodiment described above that communicates with the communication hole 29 is formed, and the communication hole 29 is opened in the filter chamber 30. A porous filter 25 such as a sponge that covers the portion is inserted.

In the bearing device using the bearing bracket 26 constructed as described above, one end of the communication hole 29 is inside the motor through the labyrinth 28, and the other end is through the porous filter 25 and the end cover 4 is provided. Communicating with the grease storage chamber 11. Therefore, similar to the first and second embodiments described above, when new grease is replenished through the oil supply nipple 12, the pressure increase of the air in the grease storage chamber 11 of the end racket 4 does not occur, and The dust that has entered from the labyrinth 28 through the communication hole 29 is removed by the porous filter 25, and does not cause grease contamination. The porous filter 25 is replaced with a new one for the periodic inspection of the motor, as in the second embodiment described above.

[0022]

As described above, according to the present invention, the opening inside the communication pipe or outside the lubricant discharge chamber that communicates the lubricant discharge chamber of the end cover attached to the frame housing the rolling bearing with the outside. Since it is covered with a porous filter,
When replenishing the lubricant, it prevents the lubricant from leaking from the labyrinth part, and it is possible to easily and smoothly push the old lubricant into the lubricant discharge chamber of the end cover. It is possible to provide a bearing device that does not generate heat and softens the lubricant and does not remove dust contained in the air from the outside to cause lubricant contamination.

[Brief description of drawings]

FIG. 1 is a sectional view showing an essential part of an embodiment of the present invention.

FIG. 2 is a front view of an end cover used in an embodiment of the present invention.

FIG. 3 is a sectional view showing a main part of another embodiment of the present invention.

FIG. 4 is a cross-sectional view showing the main parts of still another embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a configuration of a main part of a conventional bearing device.

FIG. 6 is a front view of an end cover used in a conventional bearing device.

[Explanation of symbols]

1 ... Rotary shaft, 2,21,26 ... Bearing bracket, 3 ...
Rolling bearings, 4, 15 ... End covers, 6, 7 ... Collar, 9, 10, 16, 22 ... Annular grease chamber, 11, 17 ... Grease reservoir chamber, 12 ... Lubrication nipple, 13, 28 ... Labyrinth,
14,23,29 ... Communication hole, 18,23,33 ... Filter chamber, 19,25
… Porous filter, G… Grease.

Claims (1)

[Claims] 1. A frame body for accommodating a rolling bearing to support a rotary shaft, and a frame body mounted on the frame body so as to cover the rolling bearing, and communicating with an annular lubricant chamber on the rolling bearing side and an outer periphery thereof. Equipped with an end cover that forms a lubricant discharge chamber,
In the bearing device configured to provide a communication hole for communicating the lubricant discharge chamber with the outside in the frame body, and to supply the lubricant from the end surface side of the rolling bearing opposite to the end cover, the inside of the communication hole Alternatively, the bearing device is characterized in that a porous filter is arranged so as to cover the opening on the lubricant discharge chamber side.