JPS6325885Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a bearing fixing device for rotating electric machines, especially a grease bearing fixing device.
The present invention relates to a bearing fixing device for a rotating electric machine using a oil supply method.

Grease lubrication methods and oil bath lubrication methods are generally used to lubricate the bearings of rotating electric machines, but in either case, sufficient grease or oil to lubricate the bearings must be applied to the bearings. must be supplied. 1 to 3 show conventional examples of bearing fixing devices using the grease lubrication method or the grease lubrication method among the above methods, which will be explained below.

In the figure, a ball bearing 2 is fixed to a rotating shaft 1 of a rotating electric machine in a known manner, and an inner end cover 3
is fixed to the bracket 4 with bolts 5. A plurality of annular grooves 3a are formed on the inner circumferential surface of the inner end cover 3, and the inner end cover 3 is fixed to the bracket 4 so as to be slidable with respect to the rotating shaft 1. Similarly, the outer end cover 6 has a plurality of annular grooves 6a formed on its inner circumferential surface, and is fixed to the bracket 4 by bolts 13 so as to be slidable with respect to the rotating shaft 1. Although not shown, the bracket 4 is fixed to the frame of the rotating electrical machine in a known manner.

A grease supply port 8 is formed in the upper part of the outer end cover 6, and a grease nipple 7 is attached to this port. A grease supply passage 9 is formed laterally in the upper part of the bracket 4 and communicates with the interior of the bearing housing constituted by the inner end cover 3 and the outer end cover 6.

As described above, the ball bearing 2 is kept in a sealed state, but there is a large annular space 1 surrounding it.
0,11 are formed. That is, the inner end cover 3 has an annular recess, which is inserted into the bracket 4.
By fixing it to , an annular space 10 is formed on the left side of the ball bearing 2. The outer end cover 6 also has an annular recess and a discharge port 12 communicating with the lower part thereof, and by fixing this to the bracket 4, an annular space 11 is also formed on the right side of the ball bearing 2. Therefore, grease is supplied from the grease supply port 8.
When supplying grease, these spaces 10, 11 and the discharge port 12 must be filled with grease, and more grease than necessary must be consumed.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a bearing fixing device for a rotating electrical machine that can use less grease than before. This purpose, according to the present invention, is that the bearing 2 and the bracket 4
, inner end cover 20, and outer end cover
25, the bracket 4 has a communication passage 9, which passes through the bracket 4 in the thickness direction, and the inner end cover 20
The outer end cover 25 has a grease supply port 8, a grease discharge port 28, a partition wall portion 29,
40, and the partition wall portions 29 and 40 are formed at the inner lower portion of the outer end cover 25, partition the grease discharge port 28, and form a gap S or hole 40 with respect to the center portion. The inner end cover 20 and the outer end cover are placed on both sides of the bracket 4 to which the bearing 2 is attached.
This is achieved by a bearing fixing device for a rotating electric machine characterized in that the bearing 2 is sealed by positioning and fixing the bearings 25 and 25 to form sealed spaces 22 and 26.

Next, details of the present invention will be explained based on illustrated embodiments.

4, 5, and 6 show a bearing fixing device for a rotating electrical machine according to an embodiment of the present invention. In the figures, the parts corresponding to those in FIGS. 1, 2, and 3 shall be given the same reference numerals.

In this embodiment, as illustrated, the shapes of the inner end cover 20 and the outer end cover 25 are different from those of the conventional one. That is, a protrusion 23 is formed at the upper part of the inner end cover 20 so as to form a grease reservoir 21. As in the prior art, a plurality of annular grooves 20a are formed on the inner peripheral side of the inner end cover 20, and the inner end cover 20 is fixed to the bracket 4 by bolts 24 so as to be slidable with respect to the rotating shaft 1. By this fixing, a space as a grease reservoir 21 is formed between the ball bearing 2 and the inner end cover 20, and a narrow space 22 as a sealed space on one side of the arcuate width is formed in communication with the space. Ru. Gree
In the illustrated example, the space serving as the reservoir 21 is approximately 90 mm.
It extends over the central angle of degrees and is an arcuate space 2
2 thus extends over a central angle of approximately 360-90 degrees.

On the other hand, a partition wall 29 is formed inside the lower part of the outer end cover 25, and a discharge port 28 is formed by this partition wall. A plurality of annular grooves 25a are formed in the inner peripheral side of the outer end cover 25 as in the conventional case, and the outer end cover 25 is fixed to the bracket 4 with bolts 27 so as to be slidable with respect to the rotating shaft 1. Due to this fixation, there is a narrow space 26 between the outer end cover 25 and the ball bearing 2 as the other sealed space with an annular width.
is formed. That is, the outer end cover 25
A protrusion 30 is formed only in a portion corresponding to the grease supply port 8, the rotating shaft sliding portion 25b forming the annular groove 25a, and the discharge port 28.
A shallow recess 26 is formed inside.

In the above configuration, the grease supply port 8
When grease is supplied from
, and only a small amount is accommodated in the other spaces 22 and 26. Moreover, in this embodiment, a partition wall 2 is provided between the lower part of the space 26 and the grease discharge port 28.
9 is formed, the grease must be led to the discharge port 28 through the gap S between the partition wall 29 and the rotating shaft sliding portion 25b. Also,
Since the grease has a fairly high viscosity, the space 26 inside the partition wall 29 can serve as an effective grease reservoir. Therefore, the inner end cover
Together with the grease reservoir 21 formed at the upper part of the grease reservoir 20, it also functions as a grease reservoir within the sealed casing, but in this embodiment, the grease is rather discharged through the gap S. Since the grease must be led out to the outlet 28, the effect is that filling of the grease until the outlet 28 becomes full is prevented as much as possible. In other words, in this embodiment, wasted space is eliminated and the minimum necessary amount of grease is supplied from the grease supply port 8 into the sealed casing, resulting in an extremely economical bearing device. I can say that.

Although the embodiments of the present invention have been described above, the present invention is of course not limited thereto, and various modifications can be made based on the technical idea of the present invention.

For example, in the above embodiment, the inner end cover
Although the grease reservoir 21 formed in the upper part of the grease reservoir 20 has an arcuate shape with a central angle of approximately 90 degrees, the central angle is not limited to this, and may be set to any size as necessary. Moreover, its shape is not limited to a circular arc shape, and may be, for example, a rectangular parallelepiped shape.

Further, in the above embodiment, the outer end cover 25
A gap S was provided between the partition wall 29 formed at the lower part of the rotating shaft sliding part 25b, but instead of this, as shown in FIG. 25b, and this partition wall 4
One or more through holes 40a may be formed in order to communicate the space 26 and the discharge port 28.

Further, in the above embodiments, the case where the present invention is applied to the ball bearing 2 has been described, but it is also applicable to general rolling bearings, for example, cylindrical roller bearings.

As described above, the bearing fixing device for a rotating electrical machine according to the present invention is extremely economical in terms of the amount of grease used.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing a conventional example of a bearing fixing device for a rotating electric machine, Fig. 2 is a side view in the -line direction in Fig. 1, Fig. 3 is a side view in the - line direction in Fig. 1, and Fig. 4 is a side view in the -line direction in Fig. 1. 5 is a longitudinal sectional view of a bearing fixing device for a rotating electric machine according to an embodiment of the present invention, FIG. 5 is a side view in the − line direction in FIG. 4, FIG. 6 is a side view in the − line direction in FIG. 4, and FIG. FIG. 5 is a longitudinal sectional view showing a modification of the embodiment shown in FIG. 4; In addition, in the figure, 2...Ball bearing, 8...Grease supply port, 9...Grease supply passage, 20...
Inner end cover, 21... Grease reservoir, 2
2, 26... Space, 25... Outer end cover,
28... Grease discharge port, 29, 40... Partition wall.

Claims (1)

[Scope of utility model registration request] Bearing 2, bracket 4, and inner end cover 2
0 and an outer end cover 25, the bracket 4 has a communication passage 9, which passes through the bracket 4 in the thickness direction, and the inner end cover 20 has an upper end covered with grease. The outer end cover 25 has a grease supply port 8, a grease discharge port 28, and partition wall portions 29, 40. It is formed on the inner lower part of the outer end cover 25, defines the grease discharge port 28, and forms a gap S or hole 40 with respect to the center of the bracket. 4 on both sides of the inner end cover 20
A bearing fixing device for a rotating electric machine, characterized in that the bearing 2 is sealed by positioning and fixing the outer end cover 25 and the outer end cover 25 to form sealed spaces 22 and 26.