JPH074440A - Device for lubricating rolling bearing with grease - Google Patents

Abstract

PURPOSE:To restrain grease from naturally flowing out by providing a movable valve which is located in an oil chamber, is energized to the direction of an anti-friction bearing so as to allow an opening between races to be closed at all times, is moved to the direction parting from the antifriction bearing by means of pressure at the time of oil feeding, and thereby releases the aforesaid opening. CONSTITUTION:A movable valve 13 in a drainage chamber 7 is energized by a spring 17 to the side of the anti-friction bearing 2 at all times, and a valve plate 15 comes close to an opening section between the inner and outer races of the anti-friction bearing 2, so that the opening section is thereby closed. This constitution thereby restrains grease from naturally flowing to a drainage chamber 7 from the inside of the anti-friction bearing 2. After a definite period of time has elapsed, when grease is supplemented from an oil filler port 12, grease having been filled in previously is pushed out, the movable valve 13 is retreated against the spring 17, a space is thereby formed between the anti-friction bearing 2 and the valve plate 15, and pushed-out waste grease is made to flow in the drainage chamber 7 so as to be raked out by a drainage runner 8, so that the waste grease is discharge out of a drainage port 9 via the drainage port 16 of the movable valve 13. When grease supplement has been over, the movable valve 13 is restored to an initial condition, so that grease is prevented from naturally flowing out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grease lubrication device for a rolling bearing which supports a rotary shaft of a rotary electric machine which is continuously operated for a long period of time.

[0002]

2. Description of the Related Art In a rotating electric machine or the like which is continuously operated for a long period of time, a grease is used as a rolling bearing for supporting the rotating shaft.
Those equipped with a lubrication device have been adopted. FIG. 5 is a sectional view showing the structure of a conventional grease lubrication device for rolling bearings disclosed in Japanese Utility Model Publication No. 60-15420. In the figure, 1 is a rotating shaft, 2 is a rolling bearing that supports the rotating shaft 1, 3 is a bracket attached to a body 4 of a rotating electric machine, and the rotating shaft 1 is a housing portion of the bracket 3 via a rolling bearing 2. Supported by 5. A bearing cover 6 is provided outside the housing 5, that is, on the grease discharge side, and an oil drain chamber 7 is formed between the bearing cover 6 and the rolling bearing 2. 8 is an oil drainage chamber 7, which rotates with the rotating shaft 1 to scrape out waste grease from the drainage chamber 7 through an oil drain hole 9, 10 is an inner bearing cover, 11 is a bracket 3 Is an oil supply passage leading from the oil supply port 12 to the rolling bearing 2.

Next, the operation will be described. When the rotary electric machine is assembled, the oil supply passage 11, the rolling bearing 2 and the grease are filled in advance, and when the grease is replenished from the oil supply port 12 after a certain period has elapsed during the rotation of the rotary electric machine, the grease is filled first. The aged grease that has played the role of lubrication is pushed out into the oil discharge chamber 7 by the injection pressure of the supplementary grease, is scraped off by the oil discharge runner 8 and is discharged from the oil discharge hole 9 to the outside.

[0004]

Since the conventional grease lubrication device is constructed as described above, the rolling bearing 2
The grease filled in the oil naturally flows out into the oil drainage chamber 7. Therefore, there is a problem that the amount of lubricating oil in the rolling bearing 2 decreases due to this outflow, and if the replenishment of grease is delayed, the bearing is burned out.

The present invention has been made in order to solve the above-mentioned problems, and suppresses spontaneous outflow of grease in the rolling bearing to prevent burnout of the bearing, thereby improving lubrication performance and grease. -The purpose of the present invention is to obtain a grease lubrication device for rolling bearings that can extend the replenishment period.

[0006]

In the grease lubrication device for a rolling bearing according to the present invention, the rotating shaft is supported by the housing portion of the bracket through the rolling bearing, and the lubrication port provided in the bracket communicates with the rolling bearing. In a grease lubricator for rolling bearings, an oil discharge chamber is formed on the grease discharge side of the oil supply passage and the rolling bearing, and an oil discharge runner for scraping out old grease in the oil discharge chamber is provided.
A movable valve that is normally biased by a spring in the direction of the rolling bearing in the oil draining chamber to close the interlace opening of the rolling bearing, and moves to the direction away from the rolling bearing due to the pressure during refueling to open the opening. Is provided.

[0007]

The movable valve of the grease lubrication device according to the present invention is normally urged toward the rolling bearing to close the interlace opening and suppress the spontaneous outflow of grease.

[0008]

【Example】

Example 1. Embodiments of the present invention will be described below with reference to the drawings. 1 is a sectional view showing the structure of a grease lubrication device for a rolling bearing according to Embodiment 1 of the present invention, and FIG. 2 is a portion showing a state of the grease lubrication device for a rolling bearing at the time of discharging grease. FIG. 3 is a cross-sectional view and FIG. 3 is an exploded perspective view showing the configuration of the movable valve and the biasing spring in FIG. In the figure, the same parts as those of the conventional device shown in FIG. Reference numeral 13 denotes a movable valve provided in the oil drainage chamber 7, which is slidable along the inner circumference of the oil drainage chamber 7 and projects to the entire inner circumference of the front end face 14a of the body 14. It comprises an annular valve plate 15 provided and a drainage port 16 formed by cutting out a part of the rear end of the main body 14. Reference numeral 17 is a spring that constantly urges the movable valve 13 toward the rolling bearing 2. That is, in the movable valve 13 biased by the spring 17, the valve plate 15 has the rolling bearing 2 except when the fuel is supplied, that is, during the normal operation.
Close to the side and held to close the opening.

In the rolling bearing lubrication apparatus according to the first embodiment configured as described above, the movable valve 13 provided in the oil drainage chamber 7 is constantly urged by the spring 17 toward the rolling bearing 2 side, Since the plate 15 closes the opening between the inner and outer races of the rolling bearing 2 and closes the opening, natural outflow of grease from the rolling bearing 2 into the oil drainage chamber 7 is suppressed. Also, after a certain period of time has passed, the grease is supplied from the fuel filler port 12.
When the grease is replenished, the previously filled grease is pushed out by the injection pressure, and this is the valve plate 15 of the movable valve 13.
And the movable valve 13 retracts against the spring 17,
As shown in FIG. 3, an oil drainage space is formed between the rolling bearing 2 and the valve plate 15, and the aged waste grease pushed out flows into the oil drainage chamber 7 and is scraped out by the oil drain runner 8 to move the movable valve 13 The oil is drained from the oil drain hole 9 via the oil drain port 16. And green
When the replenishment of the grease is completed, the movable valve 13 is pushed by the spring 17 and returns to the original state, thereby suppressing the spontaneous outflow of the grease.

Embodiment 2. Second Embodiment FIG. 4 is a sectional view showing the structure of a grease lubrication device for a rolling bearing according to a second embodiment of the present invention. In the figure, the same parts as those in the first embodiment shown in FIG. In the first embodiment, the main body 14 of the movable valve 13 is formed into a cylindrical shape, and the valve plate 1
5 and the oil discharge port 16 are provided, the movable valve 13 may be formed in a ring shape mainly including the valve plate 15 and the biasing force of the spring 17 may be applied to the rear surface portion close to the outer circumference. The same effect as that of the first embodiment is achieved.

[0011]

As described above, according to the present invention, since the movable valve which is spring-biased to the rolling bearing side is provided to close the opening between the bearing races, the grease in the rolling bearing is closed. -It is possible to provide a grease lubrication device for rolling bearings in which the natural flow of grease is suppressed and the lubrication performance is improved, and the grease replenishment period can be extended.

[Brief description of drawings]

FIG. 1 is a sectional view showing a structure of a grease lubrication device for a rolling bearing according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a state of the grease lubrication device of the rolling bearing in FIG. 1 at the time of discharging the grease.

FIG. 3 is an exploded perspective view showing details of configurations of a movable valve and an urging spring of the grease lubrication device for a rolling bearing in FIG.

FIG. 4 is a sectional view showing the structure of a grease lubrication device for a rolling bearing according to a second embodiment of the present invention.

FIG. 5 is a sectional view showing the structure of a conventional grease lubrication device for rolling bearings.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotating shaft 2 rolling bearing 3 bracket 5 housing part 6 bearing cover part 7 oil discharge chamber 8 oil discharge runner 11 oil supply passage 12 oil supply port 13 movable valve 17 spring

Claims (2)

[Claims] 1. A rotary shaft is supported by a housing part of a bracket via a rolling bearing, and an oil supply passage communicating from an oil supply port provided in the bracket to the rolling bearing and an oil discharge chamber on the grease discharge side of the rolling bearing are respectively provided. In a grease lubrication device for a rolling bearing, which is provided with an exhaust oil runner for scraping out old waste grease in the oil exhaust chamber to the outside of the oil exhaust chamber, in the lubrication chamber, the grease is always urged toward the rolling bearing. The grease lubrication of the rolling bearing is characterized in that a movable valve is provided to close the opening between the races of the rolling bearing and to move in the direction away from the rolling bearing by the pressure during refueling to open the opening. apparatus. 2. The movable valve comprises a cylindrical main body that is slidable along the inner circumference of an oil discharge chamber, an annular valve body and a rear end of the main body that project from the entire inner circumference of the front end surface of the main body. The grease lubrication device for a rolling bearing according to claim 1, wherein the grease lubrication device comprises an oil discharge port provided by cutting out a part of the end.