JPS6091023A - Bearing device of rotary machine - Google Patents

Abstract

PURPOSE:To limit the oil quantity of a bearing to a necessary minimum, by locating the bottom end of an opening of an oil hole connecting an oil tank to an oiling chamber at a position lower than the lowest portion of the inner diameter of the bearing outer ring collar and higher than the lowest portion of the rolling element receiving surface of the outer ring and connecting the inner periphery of the outer ring to the oil chamber. CONSTITUTION:An oiling hole 17 connecting the rolling contact surface of an outer ring 15 of a rolling bearing 2 to an oil chamber 13A is formed so as to pass through the outer ring 15. A bottom end 14A of an opening of an oil hole 10 formed inside of a bearing cover 4 so as to be connected to an upper oil tank 8 through an oil pipe 9 is provided in such a position lower than the lowest portion of the inner diameter shown by diameter D of both collars 15a of the outer ring 15 of the rolling bearing 2 and slightly higher than the lowest portion of the rolling element receiving surface 15b shown by the diameter D1 of the outer ring 15.

Description

[Detailed description of the invention] (Technical field of invention) The present invention relates to a bearing device for an oil-lubricated rotating machine.

[Technical background of the invention and its problems]

In general, bearing devices for vehicle electric motors use a grease lubrication system, which is relatively easier to prevent oil leaks than oil lubrication systems and has a simpler bearing structure. Therefore, the number of rotations of the electric motor tends to increase, and in this case, since there is a limit to the grease lubrication method, an oil 11', FF lubrication method is being considered.

By the way, in the case of oil lubrication, an oil bath method is used in which the lower part of the rolling bearing is deeply immersed in oil, and the rolling elements such as rollers or balls of the bearing are immersed in the oil at the lower part. Since the oil is stirred and scattered as droplets or mist, it is difficult to prevent oil leakage.In particular, since the rotational speed of vehicle electric motors is high, it was impossible to achieve this with a conventional oil bath type because of the high number of oil leaks.

Therefore, in order to improve the problem of oil leakage, a structure shown in FIGS. 1 and 2 has recently been proposed. To briefly describe this structure, a rotating shaft 1 is supported by a rolling bearing 2 supported by a bearing box 3, both sides of the bearing 2 are covered with a bearing cover 4.5, and the rotating shaft 1 is equipped with a bearing for a labyrinth configuration. Presser feet 6 and 7 are provided. In such a bearing device, a sealable oil tank 8 is provided above the position of the rolling bearing 2, and an arcuate groove is formed inside the oil pipe 9 and the bearing cover 4, communicating with the lower part of the oil tank 8. An oil guide hole 10 is provided, and oil supply chambers 11 and 12 are provided on both sides of the lower part of the rolling bearing 2, and oil chambers 1 for both wheels are provided.
1.12 A communication hole 13 that communicates with each other is formed on the lower surface of the inner circumference of the bearing box 3. Here, the opening lower end 14 of the oil guide hole 10 communicates with the oil supply chamber 11;
The lower end 14 is located at both side flanges 15a of the outer ring 15 of the rolling bearing 2.
, 15a, and is set upwardly from the bottom of the inner diameter surface indicated by the diameter 15a.

In a bearing device with such a configuration, the oil level H in the oil supply chamber 11 is at the same height as the lower end 14 of the oil guide hole 10, and this oil level H is on both sides of the outer ring 15 of the bearing 2. Tsuba 1
5a, the outer ring 1 of the bearing 2
Oil also flows into the inner periphery of the receiving surface 15b' of the rolling element 16, such as a roller or ball, in the roller 5, thereby supplying oil and lubricating the rolling element 16. When oil is consumed during use and the oil level H drops, air flows into the upper oil tank 8 from the opening lower end 14 of the oil guide hole 10 and the oil pipe 9, and the air Oil flows out into the oil supply chamber 11 in the opposite direction through the valve. When the oil level rises to the height H, the opening lower end 14 of the oil guide hole 10 is closed, stopping air from entering. In other words, by adopting a so-called constant oil level structure that aims at oil lubrication while keeping the oil level H constant even if oil consumption occurs, the lower part of the rolling bearing 2 that is immersed in oil can be replaced with ordinary oil. The amount is significantly reduced compared to the bath type, and this improves the ability to reduce oil leakage due to oil agitation during rotation.

However, even in such an improved bearing device, since the oil level H in the oil supply chamber 11.12 is higher than the lowest part of the inner diameter surface of both side flanges 15a, 15a of the outer ring 15 of the bearing 2, the rolling elements 1G The amount of oil to be soaked in is much larger than the amount required for actual lubrication, and the agitation of the oil during high-speed rotation still causes a considerable amount of spray and mist droplets to be scattered, making it impossible to completely prevent oil leakage and causing damage to surrounding areas. There were problems such as dirty equipment and the need to frequently refill oil tanks.

[Purpose of the invention]

The present invention was developed in view of the above circumstances, and it is possible to always keep the amount of oil supplied to a rolling bearing at the minimum amount necessary for lubrication of the bearing, and to reliably prevent oil leakage even by high-speed rotation of C1. An object of the present invention is to provide an oil-lubricated bearing device for a rotating machine that does not require oil replenishment for a long period of time.

(Summary of the Invention) The bearing device for a rotating machine of the present invention comprises a rolling bearing that supports a rotating shaft, a bearing box that supports the rolling bearing, and a bearing cover that covers the side surface of the rolling bearing. An oil supply chamber is provided at the lower side and bottom surface of the outer ring of the rolling bearing, a sealed oil tank is provided at a position higher than the oil supply chamber, and an oil guide hole is provided to communicate the oil tank and the oil supply chamber. The lower end of the opening of the oil guide hole to the oil supply chamber is positioned lower than the lowest part of the inner diameter surface of the outer ring flange of the rolling bearing and higher than the lowest part of the rolling element receiving surface in the outer ring, and further, the outer ring of the rolling bearing is It has a structure in which an oil supply hole is provided at the bottom of the oil tank, which communicates the inner periphery of the rolling element receiving surface with the oil supply chamber on the lower side. Even though the oil is kept lower than the bottom of the inner diameter surface of the outer ring collar of the bearing, the minimum amount of oil required for lubrication can be supplied from the oil supply hole to the inner circumference of the rolling element receiving surface in the outer ring, even at high speeds. There is no splashing or mist droplets caused by stirring the oil, and oil leakage can be reliably prevented.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIGS. 3 to 5. Components in the drawings that have the same configuration as those shown in FIGS. 1 and 2 are designated by the same reference numerals at the same locations in the drawings to simplify the explanation.

Here, 13A in the figure is an oil supply chamber formed at the lowest surface position of the outer ring 15 of the rolling bearing 2, and the oil supply chambers 11 and 12 on both sides of the lower part of the outer ring 15 are communicated with each other. It corresponds to the communication hole 13 shown in , but is formed slightly larger than that. Then, the oil supply chamber 13A and the transfer part in the outer ring 15 of the rolling bearing 2,
That is, the oil supply hole 17 is configured to pass through the outer ring 15 and communicate with the lowermost position of the inner periphery of the receiving surface 15b on which the rolling elements (rollers) 16 roll. Also, the upper oil tank 8
The opening lower end 14A of the oil guide hole 10 formed on the inside of the bearing cover 4 and communicating through the oil pipe 9 is lower than the lowermost part of the inner diameter surface indicated by the diameter of both side flanges 15a of the outer ring 15 of the rolling bearing 2, and Indicated by diameter D1 inside outer ring 15a 1 Rolling rest surface 1
Slightly higher than the bottom of 5b < (ffl Ii'ff
is set. Note that 18 in the figure is the oil drain hole and plug 1
9'c is occluded.

Therefore, in the bearing device having the above configuration, the oil stored in the upper oil tank 8 flows out from the oil pipe 9 to the oil supply chambers 11, 12, and 13A that communicate with each other via the oil guide hole 10, Therefore, the opening lower end 1 of the oil guide hole 10. When the oil level rises to the level h, which is the same height as IA, the lower end 14A of the opening is blocked by oil, preventing air from entering the oil guide hole 10 from there, and the oil is kept in a sealed state. Oil flow from tank 8 is stopped. Here, the oil level h is the same height as the lower end 14A of the frontage of the oil guide hole 10, that is, the outer ring 1 of the rolling bearing 2.
5 is lower than the lowermost part of the inner diameter surface of both side flanges 15a, 15a of the outer ring 15, and slightly higher than the lowermost part of the rolling element receiving surface 15b in the outer ring 15, so that the oil flows to both side flanges 15a of the outer ring 15,
Although it does not go over the inner diameter surface of 15a, the lower oil supply i
Oil flows into the inner periphery of the rolling element receiving surface 15b of the outer ring 15 from 13A through the oil supply hole 17 up to the height of the curved surface level h.

Here, the above-mentioned oil level 1] is as shown in Figures 1 and 2 above.
As shown in the figure, both side flanges 15a of the outer ring 15 of the bearing 2.

Compared to the oil level H, which is set higher than the lowest part of the inner diameter surface of the flange 15a so that the oil can flow over the inner periphery of the rolling element receiving surface 15b, as shown in FIG. Oil agitation due to the shifting of the rolling elements 1G due to the high-speed rotation of the rotating shaft 1 is minimized, almost no oil splashes or mist droplets are scattered, oil leakage is reliably prevented, and oil consumption is extremely reduced. .

Moreover, in this oil lubrication system, the rolling part, that is, the rolling element receiving surface 1
Only a small amount of oil is required in the same part of 5b, and as mentioned above, even if the oil level h is quite low, the rolling bearing 2 can be filled with enough oil! Good slippage can be achieved.

Further, when the oil level h decreases due to long-term use, air enters the oil tank 8 from the opening lower end 111A of the oil guide hole 10, and the oil in the oil tank 8 is caused to flow into the oil supply chamber 11. '1
2.13, the oil level rises, and when the oil level reaches the height h, air no longer enters from the lower end 14A and the oil stops flowing. is maintained at a height h, thereby stably lubricating the rolling parts of the bearing 2.

Incidentally, impurities such as dust and abrasion particles that are stored in the oil settle in the lower part of the oil supply chamber 13△, and are removed from the oil drain hole 18 by removing the plug 19 during periodic inspections, etc. 71 oil will be supplied to the area.

In the above embodiment, a roller bearing is used as the rolling bearing 2, but the invention is not limited to this, and a rolling bearing 2A as shown in FIG. 6, that is, a rolling element 16A made of balls, may be provided. Even when a ball bearing is used, the same effect can be obtained by setting the oil level h in the same manner as described above.

Furthermore, as shown in FIG. 7, two oil supply holes 17 and 17 may be provided on the left and right at the bottom of the outer ring 15 of the rolling bearing 2.

〔Effect of the invention〕

Since the present invention is made as described above, the amount of oil supplied to the rolling bearing is always adjusted to 8S! By keeping the amount to the minimum amount required for each wave, it is possible to reliably prevent oil leakage even during high-speed rotation, eliminating the need for oil replenishment for a long period of time, and preventing contamination of surrounding vibrators due to oil leakage. There's nothing to worry about, etc.
This oil-lubricated bearing device is extremely suitable for high-speed rotating machines such as vehicles.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a conventional oil-lubricated bearing device.
FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, FIGS. 3 to 5 show an embodiment of the present invention, and FIG. Fig. 4 is a sectional view taken along line IV-IV in Fig. 3, Fig. 5 is an explanatory diagram comparing the oil level of the rolling part of the bearing with a conventional one, and Fig. 6 is a diagram showing another embodiment of the present invention. FIG. 7 is a sectional view of a main part showing still another embodiment of the present invention. 1...Rotating shaft, 2,2A...Rolling bearing, 3...
・Bearing box, 4.5... Bearing cover, 5.7... Bearing holder, 8... Oil tank, 9... Oil pipe, 10... Oil guide hole, 11.12° 13A...・Oil supply chamber, 13... Communication hole, 14.14A... Lower end of opening, 15... Outer ring,
15a... Outer ring flange, 15b... Outer ring rolling element receiving surface,
16.16△...Rolling element, 17...Oil supply hole, 18.
...Drain hole, 19...Plug. Applicant's attorney Takehiko Suzue Figure 3 Figure 4 Figure 5-17 Figure 6

Claims (1)

[Claims] A rolling bearing that supports a rotating shaft, a bearing box that supports the rolling bearing, and a bearing cover that covers the side surface of the rolling bearing, wherein eight oil supply chambers are provided at the lower side surface and lower surface of the outer ring of the rolling bearing. As well as...
A sealed oil tank is provided at a position higher than all oil supply chambers, and an oil guide hole is provided to communicate this oil tank and the oil supply chamber, and the lower end of the oil guide hole that connects to the oil supply chamber is connected to the above-mentioned roller. The outer ring flange of the bearing is located at the lowest part of the inner diameter surface and lower than the lowest part of the rolling element bearing surface in the outer ring, and furthermore, the lower part of the outer ring of the rolling bearing is provided with oil on the inner periphery and lower side of the rolling element bearing surface. A bearing device for a rotating machine, characterized in that it is configured with an oil supply hole that communicates between the chambers.