JPS598437Y2 - Rotating electric machine bearing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to bearings used in rotating electric machines and the like, and more particularly to a bearing device for a rotating electric machine that extends the lubricant replacement period in the bearing and facilitates maintenance.

A conventional general bearing device for a rotating electric machine such as a main electric motor for a vehicle or a motor generator will be described with reference to FIGS. 1 and 2.

A rotating shaft 11 extending horizontally and connected to a rotating electric machine (not shown) is a rolling bearing 1 held in a bearing box 12.
Supported by 3.

The inner ring 13A of the rolling bearing 13 is held on the rotating shaft 11 by bearing holders 14 and 15 and an oil drain 16, and the outer ring 1
3B connects the outer cover 18 to the shoulder of the bearing box 12 through the partition plate 17.
is tightened and held in the bearing box 12 by bolts 19.

On the right side of the rolling bearing 13 is a first annular grease chamber 20 formed in the bearing box 12 and facing the rolling body of the rolling bearing 13, and on the left side is an oil pan 16 and a partition plate 17. An annular second grease chamber 2 shaped like
1 is provided and filled with grease, which is a lubricant.

A grease nipple 23 is connected to the grease chamber 20 via a passage 22, and the grease chamber 21 is connected to a chamber 24 attached to the lower part of the outer cover 18 and for storing discharged grease.

In a bearing device with such a structure, both grease chambers 2
The grease sealed in the greases 0 and 21 is subjected to heat due to stirring and temperature rise due to the operation of the rotating electric machine, and deterioration progresses.

For this reason, when a certain amount of grease is injected from the grease nipple 23 at an intermediate point before the bearing is disassembled, the grease flows in the direction shown by the arrow, and at this time the old deteriorated grease inside the rolling bearing 13 and both grease chambers 20 and 21 is removed. Push it toward the oil drainer 16.

When the rotating electric machine is operated here, the rotation of the oil drainer 16 discharges degraded grease into a chamber 24 provided at the lower part of the outer cover 18.

When the amount of grease inside the rolling bearing 13 and inside both the grease chambers 20 and 21 reaches an appropriate amount, the grease is no longer pushed out by the oil drainer 16 and the discharge into the room 24 is stopped.

Rotating electric machines for vehicles have high rotational speeds, large temperature rises, and strong intrusion of dust from the outside, so grease deterioration and contamination occur quickly, and in order to provide stable bearing lubrication, New grease had to be injected within a relatively short period of time, even though there was still some effective grease remaining.

Since the operation of injecting grease during a bearing disassembly period is limited to two or three times due to maintenance constraints, the bearing disassembly period is also short.

This goes against the industry's desire to simplify maintenance by requiring no maintenance for a long period of time, and also results in an increase in the amount of grease used.

Under these circumstances, a bearing device as shown in FIGS. 3 and 4 was proposed in order to eliminate the above-mentioned drawbacks.

In this system, the rotating shaft 11 is supported by a rolling bearing 13 held in a bearing box 31, the inner ring 13A of the rolling bearing 13 is attached to the rotating shaft 11 by a bearing retainer 32, and the outer ring 13B is supported by an outer cover 33. Bearing box 3
It is attached to 1.

A passage 34 is provided in the outer cover 33 and the bearing box 31, one end of the passage 34 is connected to an annular first grease chamber 20 provided in the bearing box 31, and a grease nipple 23 is attached to the other side.

An annular second gnosis chamber 36 is provided on the inner surface of the outer cover 33, and a grease reservoir 38 is provided on the horizontal side of this grease chamber 36, which is separated from the grease chamber 36 by a partition wall 37. The grease chamber 36 and the grease reservoir 38 communicate with each other through discharge ports 39 on the upper and lower sides of the partition wall 37.

Further, the bottom surface of the grease reservoir 38 is higher than the innermost bottom surface of the outer ring 13B of the rolling bearing 13.

In such a structure, when new grease is injected from the grease nipple 23, old and deteriorated grease is pushed out from the discharge port 39 into the grease reservoir 38, but as in the example shown in FIGS. 1 and 2, the grease reservoir is directed downward. Since the grease is not provided in the grease reservoir 38, deteriorated grease is collected in the grease reservoir 38.

This discharged gnose contains a large amount of unseparated base oil, and this base oil returns from the discharge port 39 to the second grease chamber 36, whose bottom surface is higher than the inner diameter of the outer ring 13B. It performs a lubricating action on the bearing 13.

This operation can extend the grease injection period and therefore the bearing disassembly period.

However, with this structure, when new grease is injected, the only discharge effect for the old grease is the rotation of the rolling elements, that is, the rollers or balls of the rolling bearing.
As shown in FIG. 5, when a small amount of grease 40 is discharged into the grease reservoir 38, the discharge stops.

Therefore, inside the rolling bearing 13 and both grease chambers 20 and 36
Old grease tended to remain inside without being drained.

If a large amount of grease is injected to avoid this, the inside of the rolling bearing 13 will be clogged with too much grease, and the temperature will rise due to agitation of the grease due to rotation, deterioration and softening of the grease will occur, and the grease may flow out to the outside.

For this reason, it is impossible to increase the amount and frequency of oil replenishment compared to the conventional example, and despite the advantage of effectively utilizing the base oil of the discharged grease, the bearing disassembly period cannot be extended as a result.

The purpose of this invention is to eliminate such drawbacks, and its purpose is to provide a bearing device for a rotating electric machine in which the disassembly period of the bearing is extended by increasing the amount of lubrication and the number of times of lubrication by sufficiently discharging old and deteriorated grease. It is about providing.

Another purpose of this invention is to utilize effective components such as residual base oil in deteriorated grease together with newly replenished grease, and to prevent problems such as heat generation and softening even when a large amount of grease is injected. To provide a bearing device for a rotating electrical machine that extends the grease supply period and facilitates maintenance.

The details of the present invention will be described below with reference to an embodiment of the lubricant replenishing type bearing device shown in FIGS. 6 and 7.

Components in the drawings that are equivalent to those in FIGS. 1 and 2 are given the same reference numerals, detailed explanations are omitted, and only different parts will be explained.

The partition plate 52, which is inserted between the outer ring 13B of the rolling bearing 13 and the outer cover 51 and holds the outer ring 13, is an annular second grease formed by the partition plate 52, the rolling bearing 13, and the oil sluice 16. A return hole 54 is provided below the partition plate 52 in the shape of a chamber 53 .

This return hole 54 is located slightly above the lowest position A of the inner diameter surface of the outer ring 13B of the rolling bearing 13.

Grease reservoirs 55 shown in FIG. 7 are provided on both sides in the horizontal direction inside the outer cover 51, and the bottom surface B of the grease reservoir 55 is located above the lowest position A of the inner diameter of the outer ring 13B. It gradually descends and coincides with the return hole 54 of the partition plate 52 at the center.

Therefore, the lower surface of the return hole 54 is provided slightly above the position A described above.

The gnose reservoirs 55 on both sides have a hole 54 in the center.
It communicates with the second gas chamber 53 through.

Further, the outer periphery of the oil cutter 16 faces the inside of the grease reservoir 55.

Next, the operation of the present invention will be explained.

The new grease injected from the grease nipple 23 flows through the passage 22 into the first grease chamber 20, inside the rolling bearing 13, and then into the second grease chamber 53. Push out the grease to the side of the oil drainer 16.

When the rotating electric machine is driven, old grease is scraped out toward the outer circumference by the rotating action of the oil drainer 16, and the grease reservoir 55 is
Discharge inside.

This draining action is carried out extremely smoothly due to the centrifugal force caused by the rotation of the oil drainer 16 and the large opening of the inner periphery of the grease reservoir 55.
Also, old grease will not remain inside the grease 53 and cause softening, temperature rise, etc.

When the amount of grease inside the rolling bearing 13 and both grease chambers 20 and 53 becomes appropriate, the extrusion of grease to the oil drain 16 side is stopped, and therefore the discharge of grease to the grease reservoir 55 is also stopped.

The rotating electrical machine continues to operate with an appropriate amount of new grease filled inside the rolling bearing 13 and both grease chambers 20 and 53.

On the other hand, the fouled and deteriorated gnoses discharged into the grease reservoir 55 contain base oil that remains effective without being completely separated, and this base oil increases due to soap base etc. as the temperature rises and time passes. It separates from the thickener and collects at the bottom of the grease reservoir 55.

This separated and collected base oil flows into the second grease chamber 53 from the return hole 54 at the bottom of the partition plate 52, where it lubricates the rolling bearing 13 together with new grease.

FIG. 8 shows another embodiment of the present invention, and this example is of a lubricant-filled type.

Most of the structure is the same as that shown in FIGS. 6 and 7, so only the different parts will be explained.

The outer cover 61 has a groove extending almost over the entire surface upward from the bottom of the inner diameter of the outer ring 13B (not shown) of the rolling bearing 13. A space reservoir 62 is provided.

The grease reservoir 62 is a return groove 64 provided at the bottom of the partition plate 63.
This communicates with a second grease chamber 53 (not shown).

In this example, as mentioned above, since it is a lubricant-filled type, there is no need to inject grease with a grease nipple.
Initially, both grease chambers and the grease reservoir 62 are filled with grease before use.

In this example, the base oil separated from the grease inside the grease reservoir 62 flows into the second grease chamber from the return groove 64 of the partition plate 63 and contributes to lubrication, so that a good lubrication effect can be maintained over a long period of time. , it is possible to extend the period of grease exchange due to bearing disassembly.

Since the bearing device for a rotating electrical machine according to the present invention is constructed as described above, the injected new grease drains and replaces the deteriorated old grease in the rolling bearing and both grease chambers, so the process is similar to completely new grease replacement. You can get the effect.

Even if a large amount of grease is injected, the amount of grease in the grease chamber is reduced to an appropriate amount by draining, so problems such as heat generation and softening do not occur.

Furthermore, the grease discharged into the grease reservoir returns the base oil separated over time to the grease chamber and performs a lubricating action together with new gnose, which has the advantage of extending the grease exchange period and therefore the bearing disassembly period. It is something that you have.

[Brief explanation of the drawing]

Figures 1 and 2 show a conventional example; Figure 1 is a longitudinal sectional view;
Fig. 2 is a sectional view taken along the line 2-2 in Fig. 1, Figs. 3 to 5 show conventional examples with shapes different from Figs. is a sectional view taken along the line 4-4 in FIG. 3, FIG. 5 is an explanatory view taken along the line 4-4 in FIG. 7 is a cross-sectional view taken along the line 7-7 in FIG. 6, and FIG. 8 is a view corresponding to the cross-sectional view taken along the line 7-7 in FIG. 6, showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 11... Rotating shaft, 12... Bearing box, 13... Rolling bearing, 16... Oil drainer, 20... First grease chamber, 51. 61... Outer lid, 52. 63... Partition plate, 53. 62... second grease chamber, 55.
62... Grease reservoir.

Claims (2)

[Scope of utility model registration request] (1) A rolling bearing that supports a rotating shaft, a bearing box that holds the rolling bearing, and a first grease chamber provided in a portion of the bearing box that faces the rolling body of the rolling bearing;
A partition plate that is in contact with the outer ring side surface of the rolling bearing and has a hole or groove in its lower part, an outer cover that is in contact with the outer surface of the partition plate and is fixed to the bearing box, and an inner periphery of the outer cover and the partition plate. a second grease chamber surrounded by the rolling bearing, the partition plate, and the oil drain and facing the rolling body of the rolling bearing; The grease reservoir is provided on the inner surface of the outer cover and its bottom surface is located slightly above the lowermost end of the inner diameter of the outer ring of the rolling bearing, and the grease reservoir and the second grease chamber are located inside the partition plate. A bearing device for a rotating electric machine, which communicates with each other over the entire circumference and through the hole or groove at the lower part of the partition plate. (2) A bearing device for a rotating electric machine according to claim 1, wherein the grease reservoir is formed by protruding in the horizontal direction of the outer cover.