JPH08294247A - Bearing device of rotating electric machine - Google Patents

Abstract

PURPOSE: To improve efficiency of lubricant by adding energy to the lubricant thereby making the lubricant ooze out the lubricant oil content, pushing the solid-shaped lubricant against a rotor. CONSTITUTION: When a bearing nut 14 rotates, energy consisting of the friction between the bearing nut 14 and lubricant 18 and the heat transmitted through a rotary shaft 13 and the bearing nut 14 from a rotating electric machine, in addition to the pressure by a press spring 19 works on the lubricant 18, and lubricant oil content oozes out of the lubricant 18, whereupon centrifugal force works on this lubricant oil content, and the lubricant oil content scatters inward of an outer bearing cover 16. Thereupon, the scattered lubricant oil content is supplied into the bearing 12, being aided by the wind in the direction of an arrow A, and by the slippage between an outer ring 12a and an inner ring 12b, it is supplied to the outer ring roller face 12e and an inner ring roller face 12f.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device for a rotary electric machine configured to replenish a bearing with lubricating oil from the outside.

[0002]

2. Description of the Related Art Some rotating electric machines use a shield bearing in which grease as a lubricant is sealed in the bearing, and the shield shaft is supported by the shield bearing. In the case of this configuration, since it is necessary to replace the bearing according to the life of the grease, in consideration of the fact that the life of the bearing is longer than the life of the grease, inefficient maintenance work is performed.

On the other hand, the bearing device shown in FIG. 10 uses a non-shield type bearing and is configured to replenish the bearing with grease from the outside. The bearing device will be described below. A bearing 2 is incorporated in a housing 1 of the rotating electric machine, and a rotary shaft 3 is press-fitted in the bearing 2.
Bearing covers 4 and 5 are provided on both sides of the housing 1. When the rotary shaft 3 rotates, grease is discharged from the bearing 2, a part of the grease is scattered on the bearing cover 5, and the rest is the housing 1. Is discharged to the discharge section 1a.

The grease pocket 4a of the bearing cover 4 and the grease passage 1b of the housing 1 are filled with semi-solid grease, and the grease pocket 4a is provided so as to supplement the grease discharged as the rotary shaft 3 rotates. The grease is replenished to the bearing 2 from. A guide pipe 6 is attached to the bearing cover 5, and a grease nipple 7 is connected to the guide pipe 6. And the grease pocket 4a
When replenishing the inside of the grease, use a grease gun (not shown) to move the grease from the grease nipple 7 to the guide tube 6
Through the grease passage 1b.

[0005]

However, in the above-mentioned conventional structure, the amount of grease supplied to the bearing 2 becomes excessive, and most of the grease filled in the grease pocket 4a is discharged from the bearing 2 without contributing to lubrication. It had been. For this reason, the grease is not used efficiently and the grease replenishment interval by the grease gun is shortened, which is a problem from the viewpoint of labor saving in maintenance. At the same time, the grease discharged from the bearing 2 may soften due to heat deterioration and shear deterioration, and may leak from the gap between the bearing covers 4 and 5 and the rotating shaft 3.

Therefore, as disclosed in Japanese Utility Model Laid-Open No. 54-101235, a grease tank is provided at a high temperature portion of the apparatus, and grease having improved fluidity is supplied to the bearing from the grease tank through an oil passage such as a pipe. A configuration to do so has been proposed. However, in the rotary electric machine, there is a situation in which the grease in the grease tank is heated only to about 50 ° C. Therefore, the fluidity of the grease sufficient to pass through the pipe or the like cannot be obtained, and the smooth supply of the grease cannot be performed unless a discharging means such as a pump is used.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to extend the replenishment interval of the lubricant and prevent the lubricant from leaking out with the improvement of the use efficiency of the lubricant. A bearing device for a rotating electric machine is provided.

[0008]

According to another aspect of the present invention, there is provided a bearing device for a rotary electric machine, comprising: a bearing on which a rotary shaft of the rotary electric machine is supported;
The solid lubricant that the lubricating oil component for lubricating the bearing seeps out with the application of energy, the rotating body that rotates as the rotating shaft rotates, and the lubricating body It is characterized in that it is provided with an urging means for applying energy to the lubricant when the object is pressed.

A bearing device for a rotary electric machine according to a second aspect is characterized in that the rotating body is constituted by a nut member that is screwed onto the rotating shaft and fixes the rotating shaft to the bearing. The bearing device for a rotary electric machine according to claim 3 is characterized in that the nut member is provided with a fin for generating a wind for guiding the lubricating oil to the bearing. The bearing device for a rotary electric machine according to claim 4, wherein the lubricant is pressed against the outer peripheral surface of the nut member, and the outer peripheral surface of the nut member is inclined so that the lubricating oil component is guided to the bearing by the centrifugal force accompanying the rotation of the nut member. It has a feature in that.

According to a fifth aspect of the present invention, there is provided a bearing device for a rotary electric machine, wherein a rotary member is constituted by a tubular member provided on an outer peripheral surface of a rotary shaft, and a lubricating oil component is guided to the bearing by a centrifugal force caused by the rotation of the tubular member. It is characterized in that the guide hole is formed in the tubular member. The bearing device for a rotary electric machine according to claim 6 is
The present invention is characterized in that the cylinder member is provided with a scattering prevention portion for preventing scattering of the lubricating oil component due to rotation of the cylinder member.

According to a seventh aspect of the present invention, there is provided a bearing device for a rotating electric machine, which is fixedly arranged on the outer side of the rotating body and has a cylindrical member for receiving the lubricating oil component scattered by the rotation of the rotating body. It is characterized in that it has an inclined shape that guides the received lubricating oil to the bearing. A bearing device for a rotary electric machine according to an eighth aspect of the present invention is characterized by including a holder for holding the lubricant and the urging means, and the holder is detachably attached to a fixed portion.

According to a ninth aspect of the present invention, there is provided a bearing device for a rotary electric machine, wherein the biasing means is composed of a compression coil spring, and the free length of the compression coil spring is set to a value that does not contact the rotating body. Have. According to a tenth aspect of the present invention, there is provided a bearing device for a rotary electric machine characterized in that a surface treatment for reducing a frictional force generated between a rotating body and a lubricant is applied to the rotating body.

A bearing device for a rotary electric machine according to claim 11 is
A bearing on which a rotating shaft of a rotating electrical machine is supported, a solid lubricant from which a lubricating oil component for lubricating the bearing oozes out as energy is applied, and the lubricant is applied to a stationary portion of the bearing. It is characterized in that it is provided with an urging means for applying energy to the lubricant along with pressing. A bearing device for a rotary electric machine according to claim 12 includes a switch for detecting consumption of the lubricant, and the switch has a movable contact piece that protrudes together with the lubricant due to the urging force of the urging means when the lubricant is consumed. It is characterized in that it is composed of a fixed contact piece that contacts the movable contact piece.

[0014]

According to the means described in claim 1, when energy such as pressing force by the urging means, frictional force due to rotation of the rotating body, heat transmitted from the rotating electric machine is supplied to the lubricant, The lubricating oil component oozes out of the bearing, and this lubricating oil component is supplied to the bearing. Therefore, since the required amount of lubricating oil is supplied to the bearing, the usage efficiency of the lubricant is improved.

According to the second aspect, when the rotary shaft rotates, the nut member also rotates, and energy is supplied from the nut member to the lubricant. Therefore, it is not necessary to provide a dedicated rotating body for supplying energy to the lubricant. According to the third aspect, when the fin rotates together with the nut member, wind is generated. The lubricating oil is efficiently supplied to the bearing as it is guided by this wind.

According to the fourth aspect of the present invention, when the centrifugal force caused by the rotation of the nut member acts on the lubricating oil component, the lubricating oil component runs up the outer peripheral surface of the nut member and is efficiently supplied to the bearing. According to the means described in claim 5, when the centrifugal force caused by the rotation of the tubular member acts on the lubricating oil component, the lubricating oil component is efficiently supplied to the bearing through the guide hole.

According to the sixth aspect of the invention, the lubricating oil component scattered with the rotation of the nut member is received by the scattering prevention portion and supplied to the guide hole. Therefore, the scattering of the lubricating oil component is prevented, and the lubricating oil component is efficiently supplied to the guide hole. According to the means described in claim 7, when the lubricating oil component is scattered with the rotation of the rotating body, the lubricating oil component is received by the tubular member and guided to the bearing along the inner surface of the tubular member. Therefore, the scattered lubricating oil is captured and efficiently supplied to the bearing.

According to the means of claim 8, when the lubricant is consumed, the holder is removed from the fixing portion and a new lubricant is supplied to the holder. Therefore, the work of supplying the lubricant is simplified. According to the means described in claim 9, even when the lubricant is completely consumed, the compression coil spring for urging the lubricant does not reach the rotating body. Therefore, the compression coil spring is prevented from coming into contact with the rotating body.

According to the means of the tenth aspect, since the rotor is surface-treated, the frictional force generated between the rotor and the lubricant is reduced. Therefore, consumption of the lubricant is suppressed. According to the means described in claim 11, when energy such as pressing force by the biasing means and heat transmitted from the rotating electric machine is supplied to the lubricant, the lubricant oil exudes from the lubricant, and this lubricant oil content Are supplied to the bearings. Therefore, since the required amount of lubricating oil is supplied to the bearing, the usage efficiency of the lubricant is improved.

According to the twelfth aspect, when the lubricant is consumed, the movable contact piece projects and comes into contact with the fixed contact piece.
Then, the switch is turned on and the consumption of the lubricant is detected. Therefore, the troublesomeness of checking the consumption of the lubricant is eliminated.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will now be described with reference to FIGS.
It will be described based on. First, in FIG. 1, an outer ring 12a of a radial roller bearing 12 is incorporated in a housing 11, and an inner ring 12b of the bearing 12 has a rotating shaft 1 of a rotary electric machine.
3 is press-fitted. Reference numeral 12c indicates a rolling element of the bearing 12, and 12d indicates a retainer of the rolling element 12c.

A step portion 13a and a screw portion 13b are formed on the outer peripheral surface of the rotary shaft 13. And the screw part 13b
Is a bearing nut 14 corresponding to the rotating body and the nut member.
The bearing nut 14 fastens the step portion 13 a of the rotary shaft 13 to the bearing 12 and fixes the rotary shaft 13 to the bearing 12. Therefore, when the rotary shaft 13 rotates, the bearing 1
2 inner ring 12b slips with respect to outer ring 12a, and inner ring 12b
And the bearing nut 14 rotates integrally with the rotating shaft 13.

The bearing nut 14 is composed of a taper nut and is screwed onto the rotary shaft 13 so that the large diameter portion thereof faces the bearing 12. Therefore, the outer peripheral surface of the bearing nut 14 faces the bearing 12,
3 functions as the inclined surface portion 14a which is separated from 3.

An inner bearing cover 15 and an outer bearing cover 16 are attached to the housing 11. And
Both bearing covers 15 and 16 are provided with cylindrical protrusions 15a and 16a, respectively.
Holds the shoulder portion of the outer ring 12a. The inner bearing cover 15 is located inside the rotating electric machine, and the outer bearing cover 16 is
Is exposed to the outside of the rotating electric machine.

A plurality of fins 14b are provided on the outer peripheral surface of the bearing nut 14, and when the rotating shaft 13 rotates, the plurality of fins 14b rotate integrally with the rotating shaft 13. As a result, the outside air is sucked into the inside of the outer bearing cover 16 through the gap between the outer bearing cover 16 and the rotary shaft 13, and the arrow A
The wind indicated by is generated.

As shown in FIG. 2, the outer bearing cover 16 is formed with a screw hole 16b. And screw hole 1
A cylindrical grease holder 17 corresponding to a holder is screwed into 6b, and the grease holder 17 is arranged along the axial direction of the rotary shaft 13. Also, the grease holder 1
7, a plate-shaped engaging portion 17a is formed, and by engaging the engaging portion 17a with the outer bearing cover 16,
The grease holder 17 is positioned.

A cylindrical solid grease 18 is inserted in the grease holder 17. The solid grease 18 corresponds to a lubricant, and is disclosed in JP-A-6-
It has the composition disclosed in Japanese Patent No. 172770.
Incidentally, the following a to c show substances contained in the solid grease 18. a. Grease selected from metal soap type grease and non-metal soap type organic grease ◎ b. Urethane prepolymer ◎ c. Aromatic polyamine curing agent

In the grease holder 17, a pressing spring 19 made of a compression coil spring is housed. The presser spring 19 corresponds to a biasing means, and the presser spring 19
A plate 19a is attached to the tip of the plate. Then, as shown in FIG.
The solid grease 18 is pressed against the end surface of the bearing nut 14 via a. A plurality of holes 16b are formed in the outer bearing cover 16, and a grease holder 17 having a solid grease 18 is selectively attached to each hole 16b.

Next, the operation of the above configuration will be described. When the rotating shaft 13 rotates due to the operation of the rotating electric machine, the bearing 12
The inner ring 12b of the bearing slides with respect to the outer ring 12a, and the bearing nut 14 rotates integrally with the rotating shaft 13 and the inner ring 12b.
Then, the fin 14b of the bearing nut 14 rotates, and the wind shown by the arrow A is generated.

When the bearing nut 14 rotates, the presser spring 1
In addition to the pressing force by 9, the energy of the following a and b acts on the solid grease 18, and the lubricating oil component exudes from the solid grease 18. I. Friction force between bearing nut 14 and solid grease b. When the lubricating oil component exudes from the heat solid grease 18 transmitted from the rotating electric machine through the rotating shaft 13 and the bearing nut 14, a centrifugal force acts on this lubricating oil component, and the lubricating oil component is transferred to the outer bearing cover 16
Scatter toward the inside of the. Then, the scattered lubricating oil is carried by the wind of the arrow A into the bearing 12, and the outer ring 12a
It is supplied to the outer raceway rolling surface 12e and the inner raceway rolling surface 12f by the sliding of the inner race 12b and the inner race 12b.

When the lubricating oil component exudes from the solid grease 18, the solid grease 18 is consumed. In this case, the grease holder 17 is loosened and removed from the outer bearing cover 16. Then, after the new solid grease 18 is inserted into the grease holder 17, the screw hole 16 of the outer bearing cover 16 is inserted.
The grease holder 17 is screwed into b. In addition, the presser spring 19
The free length (extension length) is set such that the pressing spring 19 does not contact the bearing nut 14 when the solid grease 18 is consumed.

According to the above-described embodiment, energy such as the spring force of the presser spring 19, the frictional force associated with the rotation of the bearing nut 14 and the heat transmitted from the rotating electric machine is applied to the solid grease 18 and exudes from the solid grease 18. Bearing 12
It is configured to be supplied to. Therefore, the required amount of the lubricating oil is supplied to the bearing 12, so that the use efficiency of the solid grease 18 is improved and the lubricating oil is constantly supplied for a long period of time. As a result, the replenishment interval of the solid grease 18 becomes longer, so that the maintenance can be saved. In particular, when the replacement timing of the solid grease 18 is adjusted to the regular inspection cycle of the rotary electric machine, the maintenance is not required during that period, and the labor saving of the maintenance is further achieved.

Further, since the required amount of the lubricating oil is supplied to the bearing 12, the excessive lubricating oil is not discharged from the bearing 12. Therefore, the bearing covers 15 and 1
No longer leaking lubricating oil from 6, resulting in
A clean environment is provided. Further, since the grease passage, the grease pocket, and the grease discharge part are eliminated, there is also an advantage that the device is downsized.

Further, the solid grease 18 is replaced with the bearing nut 14
It is configured to be pressed against. Therefore, it is not necessary to provide a dedicated rotating body for supplying energy to the solid grease 18, and as a result, the configuration is simplified. Also fin 1
Due to the fan effect that accompanies the rotation of 4b, the lubricating oil is
It is configured to supply to 2. Therefore, the solid grease 18
The use efficiency of is further improved, and as a result, the lubricating life is greatly extended.

Further, the solid grease 18 is held by the grease holder 17, and the grease holder 17 is held by the outer bearing cover 1.
It was designed to be tightened to 6. Therefore, the grease holder 1
It is possible to remove 7 and replenish a new solid grease 18, and as a result, the replenishing work of the solid grease 18 is simplified. Further, the free length of the presser spring 19 is set to a value that does not reach the bearing nut 14. For this reason, when the solid grease 18 is completely consumed, the pressing spring 19 causes the bearing nut 1 to
4 can be prevented, and as a result, the operation of the rotary electric machine is prevented from being disturbed.

The amount of lubricating oil that exudes from the solid grease 18 depends on the temperature of the bearing 12 (the amount of heat transferred to the solid grease 18), the rotation speed of the rotary shaft 13, and the solid grease 18.
It is affected by parameters such as the contact area between the bearing nut 14 and the bearing nut 14, the surface roughness of the bearing nut 14, the number of solid greases 18, and the like. Therefore, it is advisable to set the supply oil amount to an appropriate value based on adjusting each parameter in the preliminary experiment.

Further, in Japanese Patent Laid-Open No. 6-172770,
“After applying a solid lubricant composition to a bearing retainer and curing it, an ASTM life test (ASTM-D-174
1) and CRC life test (ASTM-D-3366)
As a result, the solid lubricant composition exhibits a life of 100 times or more that of the conventional mineral oil type lithium grease ”. Therefore, also in the case of the present embodiment in which the lubricant composition is applied to the solid grease 18, the same effect as this can be expected.

Next, a second embodiment of the present invention will be described with reference to FIG. A screw hole 11a is formed in the housing 11, and a grease holder 17 is screwed into the screw hole 11a. And, the solid grease 18 is the outer bearing cover 1
The protrusions 16a of the bearing nut 14 are pressed into contact with the inclined surface portion 14a of the bearing nut 14 in the radial direction of the bearing 12. The reference numeral 16c is a through hole formed in the convex portion 16a of the outer bearing cover 16.

According to the above embodiment, the solid grease 18 is pressed against the inclined surface portion 14a of the bearing nut 14. Therefore, when the bearing nut 14 rotates, centrifugal force acts on the lubricating oil component, and the lubricating oil component runs up the inclined surface portion 14a and is supplied to the bearing 12. Therefore, the fin 14b
The use efficiency of the solid grease 18 is further improved with a simple structure that does not use, and as a result, the lubricating life is significantly extended.

Next, a third embodiment of the present invention will be described with reference to FIG. An oil supply cylinder 20 corresponding to a cylinder member is screwed into the screw portion 13b of the rotating shaft 13, and the grease holder 1
The solid grease 18 of No. 7 is pressed against the inner peripheral portion of the oil supply cylinder 20. The oil supply cylinder 20 has the step portion 13a of the rotary shaft 13 fastened to the bearing 12 to fix the rotary shaft 13 to the bearing 12.

An oil supply hole 20a is formed in the outer peripheral portion of the oil supply cylinder 20. The oil supply hole 20a corresponds to a guide hole, and has an inclined shape that separates from the outer peripheral surface of the rotary shaft 13 toward the bearing 12. Further, a scattering prevention guide 20b is formed on the outer peripheral portion of the oil supply cylinder 20 outside the oil supply hole 20a. This scattering prevention guide 20b
Corresponds to the scattering prevention portion and has an L-shaped cross section.

According to the above-described embodiment, the lubricating oil component exuded from the solid grease 18 is moved to the outer peripheral portion of the oil supply cylinder 20 by being transmitted through the oil supply cylinder 20 by the centrifugal force generated by the rotation of the oil supply cylinder 20. It flows into the oil supply hole 20a. And the refueling cylinder 2
The centrifugal force caused by the rotation of 0 and the wind generated by the rotation of the oil supply hole 20b are guided along the oil supply hole 20b and efficiently supplied to the bearing 12. Therefore, the use efficiency of the solid grease 18 is further improved, and the lubricating life is significantly extended.

Moreover, since the anti-scattering guide 20b prevents the lubricating oil from scattering, the lubricating oil is efficiently supplied to the oil supply hole 20.
flows into b. Therefore, the use efficiency of the solid grease 18 is further improved, and the lubricating life is further extended significantly.

Next, a fourth embodiment of the present invention will be described with reference to FIGS.
It will be described based on. First, in FIG. 5, a cylindrical refueling guide 21 corresponding to a tubular member is provided on the inner peripheral surface of the outer bearing cover 16, and the solid grease 18 passes through the guide hole 21 a of the refueling guide 21 to form the inner ring 12 b. It is pressed against the shoulder. The inner ring 12b of the bearing 12 corresponds to a rotating body.

As shown in FIG. 6, the inner surface of the guide hole 21a has an inclined shape that inclines downward toward the bearing 12. In addition, a plurality of (4) notch-shaped detent portions 21b are formed in the fuel supply guide 21, and the detent portion 21b of the fuel supply guide 21 has an outer bearing cover 16b.
It is prevented from rotating by engaging with a convex portion (not shown).

According to the above-described embodiment, when the rotating shaft 13 rotates, the lubricating oil is scattered by the centrifugal force caused by the rotation of the inner ring 12b and is received by the inner surface of the oil supply guide 21. Then, due to gravity, it slides down along the inner surface of the guide hole 21 a and is guided to the bearing 12. Therefore, the lubricating oil component is prevented from scattering and the lubricating oil component is efficiently supplied to the bearing 12, so that the use efficiency of the solid grease 18 is further improved and the lubricating life is significantly extended.

In the fourth embodiment, the solid grease 18 is pressed against the inner ring 12b of the bearing 12, but the invention is not limited to this. For example, the radial direction of the rotary shaft 13 to the outer circumference of the rotary shaft 13 is not limited to this. It may be pressed against the surface.

Further, in the above-mentioned first to fourth embodiments,
The end surface of the bearing nut 14 (in the case of the first embodiment), the outer peripheral surface of the bearing nut 14 (in the case of the second embodiment), the end surface of the oil supply cylinder 20 (in the case of the third embodiment), the inner ring 12b of the bearing 12 (the first embodiment). Four
In the case of the embodiment), a surface treatment such as plating may be applied to reduce the frictional force acting between the solid grease 18 and the rotating body. In the case of this configuration, since the consumption of the solid grease 18 is suppressed as the frictional force is reduced, the use efficiency of the solid grease 18 is further improved.

Next, a fifth embodiment of the present invention will be described with reference to FIG. A grease holder 17 is screwed into the screw hole 16b of the outer bearing cover 16, and the solid grease 18
Are pressed against the outer ring 12a of the bearing 12 corresponding to the stationary portion. According to the above-described embodiment, when the heat generated by the rotating electric machine is transmitted to the solid grease 18 through the rotary shaft 13 and the bearing nut 14 in addition to the pressing force of the pressing spring 19, the lubricating oil component exudes from the solid grease 18. , To the bearing 12.

Although the solid grease 18 having a cylindrical shape is used in the first to fifth embodiments, the invention is not limited to this. For example, as shown in FIG. 8 showing the sixth embodiment of the present invention. Alternatively, the solid grease 18 having a fan-shaped cross section may be used. In the case of this configuration, the grease holder 17, the engaging portion 17a, and the plate 19a are formed in a fan shape in accordance with the shape of the solid grease 18, and the solid grease 18 is attached by a plurality of (for example, two) holding springs 19. Energize.

Further, in the above-mentioned first to sixth embodiments,
Although it is troublesome to check the consumption of the solid grease 18, if the switch 22 for detecting the consumption of the solid grease 18 is provided as shown in FIG. 9 showing the seventh embodiment of the present invention, the trouble is eliminated. Thus, the replacement time of the solid grease 18 is properly grasped. The seventh embodiment of the present invention will be described below.

A movable contact piece 22a of the switch 22 is provided at the tip of the presser spring 19. And the movable contact piece 2
The lead wire 23 is connected to 2 a, and the lead wire 23 penetrates the engaging portion 17 a of the grease holder 17 and is drawn out of the grease holder 17. Further, a fixed contact piece 22b of the switch 22 is provided at the tip of the grease holder 17, and when the solid grease 18 is consumed, the holding spring 19 extends and the movable contact piece 22a contacts the fixed contact piece 22b. Thus, the switch 22 is turned on.

The lead wire 23 is connected to the fixed contact piece 22b. The lead wire 23 is provided with a warning means 24 and a power source 25, which are light emitting bodies such as light bulbs. When the switch 22 is turned on, the power source 25 is supplied to the warning means 24 and the warning means 24 is turned on. It is activated to warn the replacement of the solid grease 18. The movable contact piece 22a applies the spring force of the pressing spring 19 to the solid grease 18
It also functions as a plate that transmits to.

In the seventh embodiment, the warning means 24 is composed of a light emitting body, but the invention is not limited to this. For example, it is composed of a ringing body such as a buzzer or a display body such as a liquid crystal display. May be. Further, although the outer bearing cover 16 is formed separately from the housing 11 in the first to seventh embodiments, the invention is not limited to this, and the outer bearing cover 16 and the housing 11 are integrated. It may be configured.

[0055]

As is apparent from the above description, the bearing device for a rotary electric machine according to the present invention has the following effects. Claim 1
According to the means described in (1) and (11), a necessary amount of lubricating oil can be exuded from the solid lubricant, and this lubricating oil can be supplied to the bearing. For this reason, the use efficiency of the lubricant is improved, and the interval for replenishing the lubricant is lengthened, resulting in labor saving in maintenance. Moreover, since excess lubricating oil is not discharged from the bearing, lubricating oil does not leak from the device. Further, since the grease passage, the grease pocket, and the grease discharge portion are eliminated, the device is downsized.

According to the second aspect, energy can be supplied to the lubricant through the nut member. For this reason,
It is not necessary to provide a dedicated rotating body for supplying energy to the lubricant, and as a result, the structure is simplified. According to the means described in claim 3, the lubricating oil can be guided to the bearing by the wind generated by the rotation of the fin. Therefore, the usage efficiency of the lubricant is further improved. According to the means described in claim 4, the lubricating oil component can be guided to the bearing along the outer peripheral surface of the nut member by the centrifugal force accompanying the rotation of the nut member. Therefore, the usage efficiency of the lubricant is further improved.

According to the fifth aspect of the invention, the lubricating oil component can be guided to the bearing along the guide hole of the tubular member by the centrifugal force caused by the rotation of the tubular member. Therefore, the usage efficiency of the lubricant is further improved. According to the means described in claim 6, it is possible to prevent the lubricating oil from scattering and supply the lubricating oil to the guide hole. For this reason,
The use efficiency of the lubricant is further improved. According to the means described in claim 7, the scattered lubricating oil can be received and guided to the bearing. Therefore, the use efficiency of the lubricant is further improved.

According to the means described in claim 8, the holder can be removed from the fixed portion and a new lubricant can be replenished. Therefore, the work of supplying the lubricant is simplified. According to the means described in claim 9, it is possible to prevent the compression coil spring from coming into contact with the rotating body when the lubricant is completely consumed. Therefore, it is possible to prevent the operation of the rotary electric machine from being hindered.

According to the tenth aspect, the frictional force generated between the rotating body and the lubricant can be reduced. For this reason,
The consumption of the lubricant is suppressed, and as a result, the use efficiency of the lubricant is further improved. According to the twelfth aspect, consumption of the lubricant can be detected. For this reason, the troublesomeness of checking the consumption of the lubricant is eliminated, and the replacement time of the lubricant can be properly grasped.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a grease holder part.

FIG. 3 is a view corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 4 is a view corresponding to FIG. 1 showing a third embodiment of the present invention.

FIG. 5 is a view corresponding to FIG. 1 showing a fourth embodiment of the present invention.

FIG. 6 is a diagram showing a refueling guide.

FIG. 7 is a view corresponding to FIG. 1 showing a fifth embodiment of the present invention.

FIG. 8 is an enlarged view of a grease holder showing a sixth embodiment of the present invention.

FIG. 9 is a view corresponding to FIG. 2 showing a seventh embodiment of the present invention.

FIG. 10 is a view corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

12 is a bearing, 12a is an outer ring (stationary part), 13 is a rotating shaft, 14 is a bearing nut (nut member, rotating body), 14b
Is a fin, 17 is a grease holder (holding tool), 18 is solid grease (lubricant), 19 is a holding spring (biasing means),
Reference numeral 20 is an oil supply cylinder (rotating body, cylinder member), 20a is an oil supply hole (guide hole), 20b is a scattering prevention guide (scattering prevention portion), 21
Is a refueling guide (cylindrical member), 22 is a switch, 22a is a movable contact piece, and 22b is a fixed contact piece.

Claims (12)

[Claims] 1. A bearing on which a rotating shaft of a rotating electric machine is supported, a solid lubricant in which a lubricating oil component for lubricating the bearing seeps out when energy is applied, and the rotating shaft rotates. A bearing device for a rotary electric machine, comprising: a rotating body that rotates in accordance with the above; and an urging unit that applies energy to the lubricating material when the lubricating material is pressed against the rotating body. 2. The bearing device for a rotary electric machine according to claim 1, wherein the rotating body is composed of a nut member that is screwed onto the rotating shaft and fixes the rotating shaft to the bearing. 3. The bearing device for a rotary electric machine according to claim 2, wherein the nut member is provided with a fin for generating a wind for guiding the lubricating oil to the bearing. 4. The lubricant is pressed against the outer peripheral surface of the nut member, and the outer peripheral surface of the nut member is inclined so that the lubricating oil component is guided to the bearing by the centrifugal force accompanying the rotation of the nut member. The bearing device for a rotary electric machine according to claim 2. 5. A rotating body is composed of a tubular member engaged with an outer peripheral surface of a rotary shaft, and the tubular member has a guide hole for guiding a lubricating oil component to a bearing by a centrifugal force caused by rotation of the tubular member. The bearing device for a rotary electric machine according to claim 1, wherein the bearing device is formed. 6. The bearing device for a rotary electric machine according to claim 5, wherein the cylindrical member is provided with a scattering prevention portion for preventing scattering of a lubricating oil component due to rotation of the cylindrical member. 7. A cylindrical member, which is fixedly arranged on the outer side of the rotating body and receives the lubricating oil component scattered with the rotation of the rotating body, and the inner surface of the cylindrical member is used for bearing the lubricating oil component received. The bearing device for a rotary electric machine according to claim 1, wherein the bearing device has an inclined shape for guiding. 8. The bearing device for a rotary electric machine according to claim 1, further comprising a holder for holding the lubricant and the urging means, the holder being detachably attached to a fixed portion. 9. The bearing of a rotary electric machine according to claim 1, wherein the urging means is composed of a compression coil spring, and the free length of the compression coil spring is set to a value that does not contact the rotating body. apparatus. 10. The bearing device for a rotary electric machine according to claim 1, wherein the rotating body is surface-treated to reduce a frictional force generated between the rotating body and the lubricant. 11. A bearing on which a rotating shaft of a rotating electric machine is supported, a solid lubricant in which a lubricating oil component for lubricating the bearing is exuded as energy is applied, and the lubricant is A bearing device for a rotary electric machine, comprising: a biasing unit that applies energy to a lubricant when the bearing is pressed against a stationary portion of the bearing. 12. A switch for detecting consumption of a lubricant is provided, wherein the switch contacts a movable contact piece that protrudes together with the lubricant due to the urging force of an urging means when the lubricant is consumed and the movable contact piece. The bearing device for a rotary electric machine according to claim 1 or 11, wherein the bearing device is a fixed contact piece.