JPH05149344A - Bearing device - Google Patents

Abstract

PURPOSE:To prevent the leakage to outside of grease by providing gear-shaped overshooting impellers at the ends of collars for pressing the inner ring of a bearing from both sides, in an object where circular grease chambers are demarcated on both sides of the bearing which supports a rotary shaft. CONSTITUTION:The rotary shaft of a dynamo-electric machine is supported by the bearings (an outer ring 5 and an inner ring 7) accommodated in a bracket 3 on the fixation side of a bearing device 1, and circular grease chambers 11 and 11 are made on both sides of this bearing, and when grease is injected from an outer oiling port 12, old grease is discharged into a waste oil chamber 14. In such a bearing device, objects where overshooting impellers 16 are provided at the ends are used for collars 17 for holding the inner ring 7 from both sides. Hereby, even if the grease, which has filled up the space by grease lubrication, seeks to be discharged out of the bearing 2 forcibly by rotation, the grease is prevented from leaking out of the labyrinth gap 15 by the resisting force by the overshooting action of the impeller 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a bearing device for a rotary electric machine such as a main motor for a vehicle.

[0002]

2. Description of the Related Art A conventional bearing device for supporting a rotating shaft of a conventional main electric motor for a railway vehicle (hereinafter referred to as a rotary electric machine) has a structure as shown in FIG.

In this bearing device 1, a rolling bearing (hereinafter referred to as "bearing") 2 is supplied with a new lubricating grease (hereinafter referred to as "grease") without disassembling it, and old grease in the bearing is discharged to obtain a new bearing. It is equipped with a grease replenishing mechanism that can be refilled with grease.

A rotating shaft 4 is supported by a bearing 2 housed in a bracket 3 (hereinafter referred to as a bracket) which is a fixed side of a bearing device 1 of a rotating electric machine. The outer ring 5 of the bearing 2 is also pressed and fixed in the axial direction to the bearing bracket 3 by the end cover 6, which is also the fixed side, and the inner ring 7 of the bearing 2 is pressed from both sides by the collars 8 and 8 fitted to the rotary shaft 4. Has been.

In the bearing 2, a plurality of cylindrical rollers 9 are equally divided by a cage 10 between the outer ring 5 and the inner ring 7, and the rotating shaft 4 can be rotated by the rolling of the rollers 9. ..

Annular grease chambers 11, 11 are formed in the bracket 3 and the end cover 6 located on both side surfaces of the bearing 2 at positions facing the side surface of the bearing 2, and are filled with grease. The oil is gradually separated from the filled grease and supplied to the rotating portion of the bearing 2 to perform a lubricating action.

Although the bearing device 1 is constructed in this manner, the grease used for a long period of time gradually decreases due to the leakage of oil from the bearing device and the evaporation and oxidative solidification of the grease. To do. For this reason, until the lubrication system was adopted, the bearings were disassembled periodically, old grease was washed, and new grease was refilled before use. For this reason, a lubrication type bearing device that can renew the grease without disassembling the bearing has been adopted.

That is, the external lubrication port 1 provided on the bracket 3
When the grease is injected from 2, the grease enters the first annular grease chamber 11, the bearing 2, and the next annular grease chamber 11 through the conduction path 13, and the used old grease is replaced with the used bearing 2 and the annular grease chambers 11, 11. Is discharged to the waste oil chamber 14. At this point, the grease around the bearing 2 will be renewed.

At this time, the grease does not leak from the labyrinth clearance 15 between the fixed side (for example, the bracket 3 and the end cover 6) and the rotation side (for example, the collars 8 and 8) of the bearing device. This is because the resistance is not large (0.5 mm or less) and the resistance to not leak is greater than the force to leak grease.

[0010]

However, the above-mentioned lubrication type bearing device also has the following problems and is not always sufficient for saving labor in maintenance.

Lubrication port 12 for renewing bearing grease
When more grease is supplied, the grease fills the space of the bearing 2 and the old grease that has been filled is discarded.
To discharge. When the rotating shaft 4 starts to rotate, the filled grease in the bearing 2 is expelled to the outside of the bearing 2 vigorously, and the strong pressure at this time becomes much larger than the resistance force of the labyrinth clearance 15 and part of the grease Leaks out of the bearing device through the clearance 15 of the labyrinth. If the grease supply is further repeated, this leakage will increase more and more, and the bearing must be disassembled to wash the leaked grease, which is a general drawback of a bearing structure having an oil supply device.

On the other hand, in order to reduce the leakage of grease from the clearance 15, a method of further reducing the clearance size to increase the leakage resistance can be considered, but the current clearance size is almost the limit in this type of rotary electric machine. However, there is a problem in that it becomes smaller than the radial clearance of the bearing 2 and the stationary side and the rotating side of the rotating portion interfere with each other.

The present invention has been made in view of the above circumstances, and realizes replacement of old and new grease by refueling, prevents grease from leaking through the clearance of the labyrinth, and saves labor for maintenance in the long term. It is an object to provide a bearing structure that enables it.

[0014]

In order to achieve the above object, the present invention provides a gear-shaped oil-swing impeller on the rotating side in the vicinity of the bearing side opening of the clearance of the labyrinth seal.

[0015]

With this oil swing-off impeller, a resistance force in the opposite direction, which opposes the strong grease pressure generated when the bearing rotates, is prevented, and the grease is prevented from leaking through the clearance of the labyrinth.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described based on the embodiments shown in FIGS.

Collars 17, 1 having an impeller 16 at the end
The bearing device is constructed by pressing 7 on both sides of the inner ring 7.

The impeller 16 has the structure shown in FIGS.
That is, an impeller having eight mountain-shaped swing-off blades 18 protruding from the collar surface is formed at the end of the collar 17.

According to the bearing device having such a structure, even if the grease filled in the space portion of the bearing 2 by the grease supply is expelled to the outside of the bearing 2 due to the rotation, the collar is strong against the strong pressure. Since the resistance force due to the shake-off action of the shake-off blade 18 formed on the gear-shaped or polygonal shape provided on 17 opposes, the grease is prevented from leaking out of the bearing device through the clearance 15 of the labyrinth.

FIG. 4 shows another embodiment and several examples of the present invention.
~ It demonstrates with reference to FIG.

Other Embodiment 1 (see FIGS. 4 and 5) An oil groove 19 is provided at the rear of the impeller formed at the end of the collar.

When the rotary shaft is stopped, the oil component of the grease has a function of returning to the annular grease chamber from the lower side of the rotary shaft 4 through the oil groove 19, and the clearance of the labyrinth of the oil component at the time of stop is added. Also prevent leakage from 15.

Other Embodiment 2 (Refer to FIGS. 6 and 7) The blade 2 which makes it easy to process the shape of the shake-off blade in the case of FIGS.
Although changed to 0, it has the same effect.

Other Embodiment 3 (Refer to FIGS. 8 and 9) Further, the shape of the blade is changed, and a flat surface is machined on a part of the outer peripheral surface of the cylindrical shape of the impeller to form the shake-off blade 21.

Other Embodiment 4 (see FIGS. 10 and 11) This is a blade 22 having a structure in which the part of the shake-off blade is folded back to the annular grease chamber side, and the shake-off effect is improved.

These shake-off blades are provided on the collar, but they may be provided on the rotating shaft. Further, although the present invention has been described using the roller bearings, other bearings (ball bearings, conical roller bearings, etc.) exhibit the same effect, and a housing structure instead of the bracket can also have the same structure.

[0027]

According to the present invention, leakage of grease from the labyrinth clearance due to bearing rotation after replacement of old and new grease by lubrication of the bearing device can be prevented by the strong resistance of the swing-off impeller, and therefore grease lubrication is possible. It is possible to obtain a bearing device in which the number of parts is increased to save labor due to long-term maintenance.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a bearing device for a rotary electric machine according to the present invention.

2 a side view of a collar according to the invention, FIG.

FIG. 3 is a front view of FIG.

FIG. 4 is a side view of a swing-off impeller according to another embodiment of the present invention,

FIG. 5 is a front view of FIG.

FIG. 6 is a side view of a swing-off impeller according to another embodiment 2 of the present invention,

FIG. 7 is a front view of FIG.

FIG. 8 is a side view of a swing-off impeller according to another embodiment 3 of the present invention,

9 is a front view of FIG. 8. FIG.

FIG. 10 is a side view of a swing-off impeller according to another embodiment 4 of the present invention,

FIG. 11 is a front view of FIG. 9.

FIG. 12 is a cross-sectional view of a conventional oil supply type bearing device.

13 is a view taken along line XIII-XIII in FIG.

[Explanation of symbols]

 1 …… Bearing device 2 …… Rolling bearing 3 …… Bearing bracket 4 …… Rotary shaft 6 …… End cover 7 …… Inner ring 8,17 …… Color 11 …… Circular grease chamber 12 …… Oil supply port 14 …… Waste oil Chamber 15 …… Labyrinth clearance 16 …… Shaking impeller

Claims (1)

[Claims] 1. A collar for accommodating a rolling bearing fitted to a rotary shaft, an annular grease chamber, a waste oil chamber, and an oil supply port provided on the side surface of the rolling bearing, and a collar for pressing an inner ring of the rolling bearing from both sides, and an upper surface of the collar. In a bearing device for a rotary electric machine comprising a bearing bracket and an end cover provided with a labyrinth seal and the like, a polygonal or gear-shaped swing-off impeller is provided at the end of the collar facing the bearing side opening of the labyrinth seal. A bearing device characterized by being provided.