JPS6185030A - Bearing unit for rotary electric machine - Google Patents

Abstract

PURPOSE:To smoothen the supply and the exhaust of grease and to improve lubricating efficiency by providing an end cover over the end of a bearing, and partitioning therein a grease chamber and an oil drain chamber by an intermediate partition plate having an oil drain hole. CONSTITUTION:A bearing unit in which a bearing 2 for journaling a rotational shaft 4 is engaged with a bracket 1 and a grease supply hole 7 is formed at the bracket 1, and end cover 3 is formed to coat the bearing end opposite to the side formed with the hole 7. A grease chamber 6 and an oil drain chamber 14 are formed by partitioning the interior of the cover 3 by an intermediate partition plate 15, and many oil drain holes 16 for communicating between the chambers 6 and 14 are formed at the plate 15. Thus, grease can be smoothly supplied and exhausted, sufficient amount of grease is held at the operating time to improve the lubricating efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a bearing device for a rotating electric machine such as a large-sized electric french generator, and particularly relates to a lubricating oil supply device for this bearing device.

[Technical background of the invention]

A bearing device for a rotating electric machine of this kind that has already been proposed is configured as shown in FIGS. 5 and 6.

That is, in FIGS. 5 and 6, reference numeral 1 denotes a bracket that is integrated with a case body that houses a stator (not shown) in a rotating machine. An end cover 3 is detachably attached to one side of the bearing 2.

Further, a rotating shaft (rotor shaft) 4 that is integral with a rotor (not shown) is rotatably mounted on the bearing 2.
A pair of grease chambers 5 and 6 are formed in the bracket 1 and the end cover 3 located on both sides of the bearing 20. Further, the bracket 1 in which the grease chamber 5 is located is provided with a grease supply hole 7, and a nipple 8 is screwed into the opening of the grease supply hole 7.

Furthermore, in the end cover 3 where the other grease chamber 6 is located, a pair of left and right oil drain chambers 9 and 10 are formed separated by respective partition walls 11 and 12. 12 has a relatively large communication hole 13a.
, 13b are bored so as to communicate with each of the oil drain chambers 9.10.

Therefore, when the above-mentioned bearing device of the rotating electric machine is operated for a certain period of time, the grease filled in the bearing 2 and each grease chamber 5 and 6 deteriorates and the lubrication function deteriorates. The grease is injected from the nipple 8 through the oil supply hole 7 into the bearing 2 and each grease chamber 5.6 to fill it.

On the other hand, grease that has deteriorated due to use is removed from each communication hole 1 above.
3a, 13b to the respective oil drain chambers 9, 10, and the lubricating function of the bearing 2 is not impaired.

On the other hand, in order to maintain the lubrication function of the bearing 2 in good condition, a sufficient amount of grease must always be maintained in both the grease chambers 5 and 6. , 12, each communication hole 13a, 1
3t) is desirable, but if the communication holes 13a, 13b are formed small, the grease will not be sufficiently discharged during oiling, and it will be easy to generate heat, which may reduce the lubricating function.

On the other hand, if the communicating holes 13a, 131) are formed to be large, vibrations and movement of the rotating shaft during normal operation may cause
The grease is naturally discharged into the respective oil drain chambers 9 and 10, making it difficult to stably retain the grease over a long period of time, and also accelerating heat generation and wear of the bearing 2.

[Purpose of the invention]

In order to solve the above-mentioned drawbacks, the present invention forms a grease chamber and an oil drain chamber in an end cover separated by a partition plate, and a large number of oil drain holes are bored in this partition plate. The purpose is to improve lubrication efficiency by smoothing the supply and discharge of grease during lubrication, and to ensure that a sufficient amount of grease is retained during operation over a long period of time, as well as to improve reliability. The present invention provides a bearing device for a rotating electrical machine that aims to achieve the following objectives.

[Summary of the invention]

The present invention provides a bearing device in which a bearing is fitted to a bracket, a rotating shaft is mounted to the bearing, and an oil supply hole is provided in the bracket located on one side of the bearing, wherein the oil supply hole is provided on the other side of the bearing. An end cover is provided on the above bracket, a grease chamber and an oil drain chamber are separated and formed in this end cover by a partition plate, and a large number of oil drain holes are bored in this partition plate to improve lubrication efficiency. It is configured as follows.

[Embodiments of the invention]

Hereinafter, the present invention will be described with reference to an illustrated embodiment.

Note that the present invention includes the same constituent members as those in the above-mentioned specific example.
The same reference numerals will be used to explain.

In FIGS. 1 and 2, reference numeral 1 denotes a bracket that is integrated with a case body containing a nutator (not shown) in a rotating electrical machine, and a bearing 2 is fitted on one side of the bracket 1. On one side of this bearing 2,
An end cup <-3 is removably attached. or,
A rotating shaft (rotor shaft) 4 that is integral with the rotor 4 is mounted on the bearing 2, and a pair of grease chambers 5 are provided in the bracket 1 and the end grate 3 located on both sides of the bearing 2. , 6 are formed. Further, the bracket 1 in which the grease chamber 5 is located is provided with a grease supply hole 7, and a nipple 8 is screwed into the opening of the grease supply hole 7.

On the other hand, in the end cover 3 where the other grease chamber 6 is located, the grease chamber 6 and the oil drain chamber 14 are separated by a ring-shaped middle partition plate 15, and this middle partition plate 154C is , a large number of oil drain holes 16 are bored. Further, each lip 14a in the radial direction is formed on the inner circumferential wall of the end cover 3 forming the oil drain chamber 14,
Each of the ribs 14a forms a cabin in which the oil drain chamber 14 is subdivided.

In particular, the oil drain holes 16 bored in the partition plate 15 are formed by forming elongated holes in a staggered manner as shown in FIG. 3(A). to smoothly flow out into the oil drain chamber 14, and
In addition, a sufficient amount of grease is retained for a long period of time during operation.

Furthermore, as shown in FIG. 3(B), the oil drain hole 16' drilled in the partition plate 15 is formed to have a straight length, thereby facilitating the smooth discharge of grease. It was designed to do so.

Furthermore, the oil drain hole 1G of the partition plate 15 shown in FIG. 3(0) is a modification of the above-mentioned FIG. 3(A).
It is formed with a row pressure and a constant pitch interval. In addition, the oil drain hole 16a of the partition plate 15 shown in FIG. 3(D)
, 16b are two rows of holes of different sizes, and are similar to the oil drain holes 16 of the partition plate 15 shown in FIG. 3(K).
a, 16tl is a modification of Fig. 3 (B),
L￥i, when assembling the long holes, the upper hole 16a is made larger, and the lower hole 16 is made larger.
t) is formed small to ensure grease retention.

Next, in another embodiment of the present invention shown in FIG. It has a larger shape and has substantially the same configuration as the embodiment described above.

〔Effect of the invention〕

As described above, according to the present invention, the bearing 2 is fitted to the bracket 1, the rotating shaft 4 is mounted to the bearing 2, and the oil supply hole 7 is formed in the bracket 1 located on one side of the bearing 2. In the bearing device equipped with the above, an end cover 3 is provided on the bracket 1 located on the other side of the bearing 2, and a grease chamber 6 and an oil drain chamber 14 are separated and formed in the end cover 3 by a partition plate 15, Since a large number of oil drain holes 16 are bored in this partition plate 15, it is possible not only to smoothly supply and discharge grease, but also to maintain a sufficient amount of grease during operation for a long period of time. It is possible to improve the lubrication efficiency by ensuring that the lubrication efficiency is maintained, and it is also possible to optimize the number of times of refueling.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a bearing device for a rotating electric machine according to the present invention, and FIG.
The figures are a sectional view taken along the chain line A-A in Figure 1, and a cross-sectional view taken along the chain line A-A in Figure 1.
), (B), (0), (D), (E) and FIG. 4 are diagrams showing other embodiments of the present invention, and FIG. 5 is a bearing device for a rotating electrical machine that has already been proposed. FIG. 6 is a cross-sectional view taken along the chain line B-BiC in FIG. DESCRIPTION OF SYMBOLS 1... Bracket, 2... Bearing, 3... End cover, 4... Rotating shaft, 5, 6... Grease chamber, 7...
... Oil supply hole, 14 ... Oil drain chamber, 15 ... Partition plate,
16...Oil drain hole. Applicant's agent Kiyosho Inomata 6

Claims (1)

[Claims] 1. A bearing device in which a bearing is fitted into a bracket, a rotating shaft is mounted on the bearing, and an oil supply hole is provided in the bracket located on one side of the bearing, in which The above-mentioned bracket located on the side is provided with an end cover, the end cover has a grease chamber and an oil drain chamber separated by a partition plate, and a large number of oil drain holes are bored in this partition plate. Bearing devices for rotating electric machines. 2. A bearing device for a rotating electric machine according to claim 1, wherein the partition plate is a punching plate.