JPS5950225A - Bearing device of rotary machine for vehicle - Google Patents

Abstract

PURPOSE:To maintain for a long period of time the external air cutting off operation and prevent fouling and deterioration of bearing lubricating grease by forming an annular groove in which sealing grease is filled in the internal peripheral member of a stator member and a sealing agent filling chamber at the outer part of the annular groove. CONSTITUTION:External air which is going to flow into a machine through a minute gap (g) is cut off by a sealing agent W within the annular groove 22, and hence the external air is prevented from flowing into the machine. When the machine is continuously used for a long period of time, the sealing agent W within the annular groove 22 is affected by a rotating collar 9 and escapes into the minute gap (g) gradually vanishes, whereas the sealing agent W filled within the sealing agent filling chamber flows down and replenished, and the external air cut-off effect is maintained. With the advance of the replenishment and supply of the sealing agent W, a space occurs at the upper part of the sealing agent filling chamber 23. However, since the sealing agent filling chamber 23 is hermetically closed, the external air cut-off operation is not impaired.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a bearing device for a rotating machine for a vehicle with improved sealing performance, such as a main electric motor for a vehicle. [Technical Background of the Invention and Problems thereof] The main electric motor is installed under the floor of the vehicle, and
Since the bearing has a built-in cooling blower, various measures have been taken to prevent outside air containing dust, iron powder, etc. from entering the bearing. Figure 1 shows the bearing structure of a conventional vehicle traction motor.
In the figure, reference numeral 1 indicates a frame of this electric motor, and a bracket 2 and an end cover 3, which are stator members, are provided at both ends of the frame. It is formed. The rollers 5 provided in the bearing housing part 4 are υ bearings, and the bearing inner ring 5a
is fixed to the rotor shaft 6, and the bearing outer ring 5b is fixed to the bracket 2 to rotatably support the rotor shaft 6. Reference numeral 7 denotes a grease filling chamber for supplying lubricating grease to the rotation support portion of the rotor shaft 6 by the bearing 5, and a grease filling chamber 7 is provided on the inner end surface of the bracket 2 and the end cover 3, which form the bearing housing portion 4, facing the bearing 5. It is provided. 8,91
11'+It receiver 1] fitted on both sides of the fixed part of the inner ring 5a of the II+III receiver of the trochanter 16 above, and between the outer periphery of this inner collar 8 and the shaft hole of the bracket 2 and the outer side. A minute gap g is formed between the outer circumference of the collar 9 and the shaft hole of the end cover 3. Reference numeral 10 denotes a ventilation fan installed inside the machine. As the fan 10 rotates, the air inside the machine is exhausted to the outside of the machine through the frame hole 11, and cooling air is sucked in from the intake port (not shown) at the other end to ventilate the machine. I'm trying to cool it down.

In such a structure (the pressure in the table is negative pressure, outside air flows into the machine through the minute gap g mentioned above during use).The main electric motor for the vehicle can be accessed under the floor of the vehicle. Therefore, the outside air contains a lot of dust, iron powder, etc. that are stirred up by the wind pressure during driving.Therefore, when such outside air flows into the cabin through the minute gap g as described above, this outside air The lubricating grease becomes contaminated and its lubricating ability is significantly reduced.

Despite the desire to extend the disassembly and return cycle of vehicle traction motors, due to the contamination and deterioration of the grease due to the inflow of outside air, the grease was replaced by disassembling the bearing in the period 〒-1). ? To make the decomposition regression longer (・Yo1., +4!4+A).

In order to prevent contamination of the lubricating grease due to the intrusion of outside air, one method has conventionally been used in which sealing grease is applied to the minute gap g to prevent the ingress of dust, but this effect has been shown to be effective in short 11JI. was effective, but the effect could not be maintained over a long period of time because the sealing grease would disappear. An annular vortex 12 is surrounded on the inner peripheral surface,
A method has also been taken to prevent the intrusion of outside air and dust by sealing grease in this annular tjIf12, but in this method, the grease sealed in the current groove 12 gradually becomes minute as the tar collar 9 rotates. It escapes into the gap g and disappears, 1) 1! Since the grease in the groove 12 quickly empties, it is difficult to block outside air for a long period of time.
It was not possible to maintain the effect of playing JR.

[Purpose of the invention]

This invention has been made in view of the above circumstances, and provides a vehicle structure in which the sealant such as grease filled in the annular groove does not disappear for a long period of time and can maintain an outside air blocking effect for a long period of time. The purpose is to provide fFlj bearing devices for rotating machines.

[Summary of the invention]

In order to achieve the above object, the present invention provides a bearing support iτIX of a stator member forming a bearing bearing part.
An annular groove as described above, which faces the outer circumferential surface of the rotor shaft, is provided in the inner circumferential surface located on the outer side, and an annular groove is formed in the stator section above the annular groove to communicate with the annular groove. A communicating sealant filling chamber is provided, and this filling chamber and the annular groove are filled with a sealing agent such as grease for sealing the minute gap between the stator part +4 and the rotor shaft, so that the outside air blocking effect can be maintained for a long period of time. It is characterized by the following.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described based on the drawings of FIGS. 2 and 3. 2 in the figure is the motor frame 1 (first
3 is a fixing part fixed to this bracket 2 (see the figure) as a stator member, and 3 is an end cover fixed to this bracket 2. Inner lid 13 as a stator portion forming part 4
t (l!if jR-teL/do. 5 is the above riff 11
It is a rolling bearing provided in a receiving housing tilt d, and its inner ring 5a and outer ring 5b are 1. , rotatably supports rotor Ql+e. 7 is this rotor ill 6's above 'III
In a large room filled with grease for supplying grease to the rotary support portion by the bearing 5, the bracket 2 and the inner cover 13 forming the bearing ring portion 4 are provided at both ends facing the bearing 5 as shown in FIG. It is set up as follows. Reference numeral 8.9 indicates upper H[[[[[] two inner and outer bearing fixing collars fitted on the fixed part side of the bearing inner ring 5a of the rotor shaft 6, and the outer peripheral surface of both collars and the bracket 3 and the inner cover 13 are connected to each other. A minute gap g similar to the conventional one is formed between the inner peripheral surface and the inner circumferential surface. 10 indicates a ventilation fan. The above configuration is the conventional electric motor + rJt shown in Figure 1.
The construction is almost the same except for the old installation of the inner cover 13, but this invention is based on the stator member located outside of the 11 11 support part in the 1i 111 + receiving device ft of +1 and intermediate construction. An annular groove 22 is provided on the inner circumferential surface of the inner lid I3, which is opened so as to face the outer circumferential surface of the outer collar -9, which is the outer circumferential surface of the rotor shaft 6. A hollow sealing agent filling chamber 23 is provided above the inner cover 13 and the end cover 3, which is formed as shown in FIG. The filling chamber 23 and the annular groove 22 are filled with a sealing agent W such as grease for sealing the minute gap g mentioned above.

In the bearing device configured as described above, the above-mentioned minute gap gf: the outside air it which is about to flow into the machine as shown by the dotted line arrow in Fig.
Since it is blocked by the sealant W in the bearing 5, the problem of it flowing into the machine through the minute gaps inside and inside the bearing 5 is prevented.

However, if you continue to use it for a long time, will the above-mentioned current situation occur? ? ′□ν22
Under the influence of the rotating collar 9, the sealing agent W in the chamber gradually escapes into the minute gap 2 (f'i is lost, but in this case, the sealant W is filled into the 1°1''i chamber 23). As shown in Fig. 4, the sealing agent W flowing into the annular groove 22 is replenished and the external air shielding effect is maintained. Room 2.?
A space such as 34 and 1 is created above the space, but even if such a space is created, the sealant filling chamber 23 is sealed as a cavity, so that the outside air is blocked. There are no seven. In addition, the sealant W in the filling chamber 23
The supply to replenish the annular groove 22 can be made stable by effectively utilizing vibrations during continuous rotation of the main motor and the weight of the sealant W, and by appropriately providing the shape of the sealant filling chamber 23. can.

Due to the above-mentioned effects, it is possible to prevent outside air from flowing into the machine interior for a long period of time, and it is therefore possible to prevent contamination and deterioration of the gamma-closing grease in the ill+receiver for a long period of time.

FIG. 5 and FIG. 36 are sectional views of essential parts of a bearing device showing another embodiment of the present invention, in which an annular groove 22 is formed between the inner cover 13 and the end cover 3, and A sealant filling chamber 23 is provided above the inner periphery of the end 53, and two openings 13a' are provided in the inner lid 13, and the annular groove 22 and the chamber 1''
13b communicates with the sealant filling chamber 23 and the opening 1.
3a.

13b and the annular groove 22 are completely filled with the sealant W. The rest of the structure is the same as that of the embodiment shown in FIGS. 2 and 3, so the same parts are given the same reference numerals and a detailed explanation of 1 will be omitted.

〔Effect of the invention〕

As explained above, in this invention, the stator R1
An annular groove to be filled with sealing grease is formed on the inner periphery of the groove, and a sealing agent filling chamber is provided above the annular groove to replenish the sealing grease to prevent outside air from entering for a long period of time. It is possible to prevent contamination and deterioration of the bearing lubricating grease due to this, and it is possible to greatly extend the interval between updates of the lubricating grease due to disassembly of the bearing device, which has the effect of realizing labor-saving maintenance.

[Brief explanation of drawings]

The younger brother 1 figure is the conventional vehicle main type I (・0 bearing equipment (E (
FIG. 2 is a vertical cross-sectional view of the main part of a bearing device showing an embodiment of the present invention, FIG. Fig. 4 is a sectional view explaining the operation of the mouth opening 1 receiver, Fig. 5 is a longitudinal sectional view showing another embodiment of the invention as shown in Fig. It is a diagram. 1... Electric jQII machine frame, 2...1. ', l Teishobe Toshi-C's placard, 3... same end rose, 4.
・・Bearing how song t<11.5・・Rolling bearing,
6... Rotor shaft, 7... Bearing lubricating grease filling chamber, 8, 9... Collar, g... Minute gap, 10...
Ventilation fan, 12, 2' 2... annular groove,],?・
...Inner lid as a stator member, 23...Sealant filling chamber, W...Sealant. J11i Patent Attorney Suzue Takehiko Figure 3 W Figure 4

Claims (1)

[Claims] A rolling bearing for supporting the rotor shaft is provided in a bearing housing portion on the stator portion side, and a grease filling chamber is provided on an inner end surface of the bearing housing portion of the stator member for supplying lubricating grease to the rotary support portion of the rotor shaft. In the bearing device provided with the above, an annular groove facing the outer circumferential surface of the rotor shaft is surrounded in an inner circumferential surface portion of the stator member structure located outward from the bearing support portion, and an annular groove is provided above the annular groove. A sealant filling chamber is formed in the stator member and communicates with the annular groove, and a sealant filling chamber and the annular groove are filled with grease or the like for sealing a minute gap between the stator member and the rotor shaft. A bearing device for a rotating machine for a vehicle, characterized in that it is filled with a sealant.