JPH11356005A - Vehicle main motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a vehicle main motor which enables reducing the frequency of maintenance/inspection required by the leakage of lubricating oil. SOLUTION: An annular negative pressure releaf chamber 13A is formed on the rotor core side of ball bearings 5B which are inserted into the inner circumference of a bearing plate 4A provided on the right side of an outer frame 1A. A linkage hole 18A is formed between the top end of the negative pressure releaf chamber 13A and the right end of the outer frame 1A. The outer frame 1A part of the linkage hole 18A is connected to a linkage hole 21 formed on the left side of the upper part of the outer frame 1A through a ventilation pipe 20. A part of cooling air sent out from a ventilation fan 14 is supplied to the negative pressure relief chamber 13A to prevent the lubricating oil of the ball bearings 5B from leakage caused by the negative pressure on the rotor core side of the bearing 4A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a main motor for a vehicle.

[0002]

2. Description of the Related Art FIG. 9 is a longitudinal sectional view showing an example of a conventional main motor for a vehicle, and FIG. 10 is an enlarged detailed view of a bearing portion on the right side of FIG. 9 and 10, a bottomed cylindrical outer frame 1C is used.
The stator core 2 is press-fitted into the inner periphery of the central portion of the stator core. Each of the slots formed in the inner periphery of the stator core 2 in the axial direction has a stator winding having both ends protruding from the stator core 2. 2a is inserted.

[0003] A plurality of exhaust ports 1a are formed on the left side of the outer frame 1C, and a large-diameter air inlet 1b is formed on the right side of the outer frame 1B. A substantially convex ventilation filter 15 is placed and fixed on the outer surface side of the air inlet 1b.

A disc-shaped side plate 3 is attached to the left end opening of the outer frame 1C via a fitting portion projecting from the right side of the side plate 3, and is fixed to the outer frame 1C with a plurality of bolts. Have been. A bearing retainer 6A is attached to the center of the left side surface of the side plate 3 via a fitting portion projecting from the right side of the bearing retainer 6A, and is fixed to the side plate 3 with a plurality of bolts.

On the other hand, a bearing plate 4D is attached from the inside to an opening formed in the center of the right end of the outer frame 1C, and
The outer peripheral portion is fixed to the outer frame 1C by a plurality of bolts inserted from the outer surface side of C.

A detector cover 9a is fixed to the center of the right end of the outer frame 1C. A speed detector 9 is inserted into a through hole formed at the upper end of the detector cover 9a, and a flange portion is provided. It is fixed to the detector cover 9a with bolts.

At the center of the right end surface of the bearing plate 4D, a bearing retainer 6B having the same shape as the left end bearing retainer 6A is provided.
And is fixed from the outside with a plurality of bolts via a fitting portion projecting from the left side of the.

A rotor shaft 7 is inserted through the center of the left side plate 3 and the right bearing plate 4C. A rotor core 8 is press-fitted into the center of the rotor shaft 7, and the rotor core 8
Has a plurality of vents 8a formed in the axial direction.

A rotor bar is inserted into each of the slots formed in the inner periphery of the rotor core 8 in the axial direction.
Short-circuit rings are brazed to both ends of each rotor bar protruding therefrom.

A ventilation fan 14 is press-fitted into the rotor shaft 7 on the left side of the rotor core 8. Annular oil drains 10A and 10B are provided on the stepped portion of the rotor shaft 7 formed on the left side of the ventilation fan 14 and the stepped portion formed on the right side of the rotor core 8.
Are inserted respectively.

[0011] Between the oil drain 10B and the bearing plate 4C,
A narrow gap rabbins portion 12C shown in FIG. 10 is formed. Of these, with respect to the left side of the oil drain 10A on the left side,
The roller bearing 5A is pressed into the rotor shaft 7 and the right oil drain 10
A ball bearing 5B is press-fitted to the right side of B as well.

A speed detector 9 is provided on the right side of the ball bearing 5B.
The cylindrical part at the center of the gear disk 11 whose rotation angle is detected by press-fitting is press-fitted and fixed to the end face of the rotor shaft 7 with a plurality of bolts.

Grease as a lubricating oil is injected into the left and right roller bearings 5A and the ball bearings 5B. Grease is also injected into lubrication chambers 4a formed on both sides of the ball bearing 5B in FIG. Grease is also injected into the inside of the roller bearing 5A shown on the left side and the lubrication chambers formed on both sides thereof.

A tapered portion 7a connected to a gear box (not shown) via a flexible joint is shown on the left side of the rotor shaft 7. In the vehicle main motor configured as described above, the rotation of the rotor shaft 7 is transmitted to the gear box via a flexible joint (not shown) connected to the tapered portion 7a, and the wheel is decelerated by the gear box to reduce the wheel. Drive and run the vehicle.

When the rotor shaft 7 rotates, the cooling air is discharged to the inner space A on the left side of the stator core 2 by the rotation of the ventilation fan 14 as shown by an arrow G in FIG. The air is exhausted from the exhaust port 1a formed in the frame 1B.

As a result, as shown by an arrow G3, the air filter 15
Is sucked into the ventilation fan 14 through the air holes 8a, the outer periphery of the rotor core and the stator core 2 as shown by an arrow G4. The rotor bar of the rotor and the windings of the stator are formed by the arrow G inside the outer frame 1C.
5, as indicated by G6, cooling is performed by cooling air flowing from right to left.

[0017]

However, in the vehicle main motor configured as described above, the cooling air drawn into the ventilation fan 14 by the ventilation fan 14 while the vehicle is running, as indicated by arrows G5 and G6. By the air, the right inner space B
Becomes negative pressure proportional to the rotation speed of the vehicle main motor, as shown by a line D3 in the graph of FIG.

As a result, the grease inside the right lubrication chamber 4a, whose temperature has risen and softened and its fluidity increased at high speed rotation, gradually flows from the rabbins portion 12C formed between the bearing plate 4D and the oil drain 10B. May be leaked.

Then, in a vehicular main motor mounted on a vehicle whose speed is increasingly increased, the frequency of grease refueling must be increased. On the other hand, especially for long-distance trains, the speed has been further increased, and the trend of the era has demanded no maintenance, and the downsizing and weight reduction have also been demanded.

In order to cope with high-speed rotation, lubricating oil is required to be a liquid lubricating oil having low viscosity and good fluidity from grease, and having a low temperature rise rate at high-speed rotation. Then, since it is easier to vaporize, the outflow from the rabins portion increases, and it is not possible to meet the demand for maintenance-free operation. Therefore, an object of the present invention is to provide a vehicular main motor capable of suppressing an increase in the frequency of maintenance / inspection due to outflow of lubricating oil.

[0021]

According to the first aspect of the present invention, there is provided an outer frame in which a stator is inserted into an inner periphery, bearings provided on both sides of the outer frame, and a rotor shaft attached to the bearing. And a ventilating fan attached to the rotor shaft, the rotor having a rotor core disposed opposite the stator at a middle portion of the rotor shaft and a ventilation fan mounted on the rotor shaft. A negative pressure relief chamber communicating with the lubrication part of the bearing is formed on the inner peripheral side of the support part of the bearing on the side opposite to the fan, and a blower for supplying a part of the cooling air discharged from the ventilation fan to the negative pressure relief chamber Means are provided.

In particular, the vehicle main motor according to the second aspect of the present invention includes a blower pipe for guiding a part of the cooling air discharged from the ventilation fan to the opposite side of the ventilation fan, and one end thereof communicates with the blower pipe. A communication hole whose other end communicates with the negative pressure relaxation chamber is formed in the support portion of the bearing.

In particular, the main motor for a vehicle according to the invention according to claim 3 is characterized in that between the oil drain having a convex cross section inserted into the rotary shaft inside the bearing opposite to the ventilation fan and the inner surface of the bearing portion. In addition, a rabbins portion is formed, which is formed of concave and convex portions which are loosely fitted to each other and communicates with the negative pressure relaxation chamber.

In particular, the vehicle main motor according to the invention according to claim 4 is characterized in that an open hole communicating between the negative pressure relief chamber and the outside of the outer frame is formed in the support portion of the bearing. Furthermore, in the vehicle main motor of the invention corresponding to claim 5, a guide plate for guiding a part of the cooling air discharged from the ventilation fan to the blower tube is provided inside the communication hole on the other side of the outer frame. It is characterized by.

According to the present invention, the lubricating oil flows out of the lubricating portion of the bearing due to the negative pressure inside the supporting portion of the one bearing due to the rotation of the ventilation fan. Is suppressed by the cooling air supplied to the negative pressure relaxation chamber. Further, in the invention corresponding to claim 3, a decrease in the pressure of the negative pressure relaxation chamber is further suppressed by the rabbins portion.

In the invention corresponding to claim 4,
The pressure of the negative pressure relaxation chamber is increased by the supplied cooling air, and when the cooling air flows from the negative pressure relaxation chamber into the lubricating portion, the cooling air is discharged to the outside of the outer frame from the opening.
Furthermore, in the invention corresponding to claim 5, when the amount of cooling air flowing into the ventilation tube from the communication hole on the other side of the outer frame is small, the cooling air is increased by the guide plate.

[0027]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a main motor for a vehicle according to an embodiment of the present invention; FIG. 1 is a longitudinal sectional view showing a first embodiment of a vehicle main motor of the present invention,
FIG. 10 is a diagram corresponding to FIG. 9 shown in the related art and corresponding to claims 1 and 2. FIG. 2 is an enlarged detailed view of the vicinity of the bearing portion on the right side of FIG. 1 and also corresponds to FIG. 10 of the related art. Further, FIG. 3 is a right side reduced view of FIG. 1 and shows a trolley or the like on which the vehicle main motor is mounted by a dashed-dotted line together with a traveling rail.

FIGS. 1, 2 and 3 are different from FIGS. 9 and 10 shown in the prior art in that a negative pressure relief chamber, which will be described below, is further inside the rabbins portion inside the right ball bearing 5B. Is formed, and the pressure in the negative pressure moderating chamber is increased by connecting the negative pressure moderating chamber and the left internal space A with a blower tube or the like. .

Therefore, the same elements as those in FIGS. 9 and 10 are denoted by the same reference numerals, and redundant description will be omitted. That is, a small-diameter communication hole 21 is formed on the upper left side of the outer frame 1A with respect to the right side of the exhaust port 1a formed on the upper end. On the outer surface side of the communication hole 21, a connection cylinder 20a having a bottomed cylindrical shape is provided.
And the outer peripheral end is welded to the outer frame 1A.

On the other hand, in the bearing plate 4A fixed to the center of the right end of the outer frame 1A, a single communication hole 18A is formed in parallel with the surface on the side of the internal space B. Cut 10
The above-described negative pressure relaxation chamber 13A is formed between the upper end surface of B and the upper end surface.

At the right end of the outer frame 1A, an inlet 1b shown in FIG. 2 is formed at a position above the upper end of the detector cover 9a. An L-shaped blower pipe shown by a two-dot chain line is provided between the inlet 1b and the connection tube 20a on the upper left side of the outer frame 1A.
20 are connected.

In FIG. 3, a hook 1c is protruded from an upper portion on the left side of the outer cylinder 1A, and a hook 1d is protruded from a lower portion on the left side. Is fixed to a bogie frame 25 indicated by.

At the lower end of the outer cylinder 1A, a pair of feet 1f is suspended, and at the upper right side of the outer frame 1A, a hook 1e is projected. Is indicated by a dashed line, and the wheel 22 is indicated by a dashed line on the right side of the outer frame 1A.

Further, a rail 24 on which the wheel 22 rolls is shown at the lower end of the wheel 22, and a vehicle body 23 is shown above the ventilation filter 15 at the upper center of the outer frame 1A. In the vehicle main motor configured as described above, the pressure in the internal space A on the left side of the outer frame 1A increases due to the cooling air discharged from the ventilation fan 14.

Then, a part of the cooling air inside the internal space A is exhausted by the exhaust port 1a formed at the upper left portion of the outer frame 1A.
Flows into the blower tube 20 through the connection tube 20a. The cooling air that has flowed into the blower tube 20 flows down through the communication hole 18A formed by the bearing plate 4A via the inlet 1b formed at the right end of the outer frame 1A, and flows into the negative pressure relaxation chamber 13A at the lower end. Thus, the pressure in the negative pressure relaxation chamber 13A is slightly increased.

Here, the amount of cooling air flowing into the negative pressure relaxation chamber 13 is proportional to the rotation speed of the ventilation fan 14, that is, the running speed of the vehicle. On the other hand, the decrease rate of the pressure in the inner space B on the right side of the outer frame 1A is also proportional to the rotation speed of the blower fan 14 as described above.

Therefore, the internal space A and the negative pressure relaxation chamber 13A
By selecting the inner diameter of the blower tube 20 for connecting the air pressure, as shown by the dashed line D1 or the dashed line D2 in the graph of FIG. 4, it is close to the atmospheric pressure shown by the solid line between these lines D1 and D2. Value can be maintained.

Next, FIG. 5 is a partially longitudinal sectional enlarged detailed view showing a second embodiment of the vehicular main motor of the present invention, and corresponds to FIG. 2 shown in the first embodiment. It is a figure corresponding to item 3.

FIG. 5 differs from FIGS. 1 and 2 shown in the first embodiment in the structure of the lubrication chamber and the rabbins from the ball bearing 5B to the internal space B.
It is the same as FIG. 1 and FIG.

That is, a groove having the same width and the same diameter as the small diameter portion is formed in the oil drain 10C press-fitted on the left side of the ball bearing 5B on the left side of the small diameter portion adjacent to the left side of the inner ring of the ball bearing 5B. Have been. Further, a double convex portion 10a is formed in a substantially F-shape at the left end of the oil drain 10C.

On the other hand, the ball bearing 5 is provided on the bearing plate 4B.
On the left side of B, a lubrication chamber 4b having the same shape as the lubrication chamber 4a shown in FIG. 2 is formed to face the groove of the oil drain 10C.
Further, on the left side of the negative pressure relief chamber 13B of the bearing plate 4B, a double concave portion is formed in an annular shape so that a double convex portion 10a formed on the oil drain 10C is loosely fitted to form a rabbins portion 12B. I have.

In the vehicle main motor configured as described above, even if the amount of cooling air flowing into the negative pressure mitigation chamber 13B is small, the oil outflow distance of the rabbins portion 12B can be extended, and the negative pressure mitigation can be performed. Since the ventilation resistance from the chamber 13B to the internal space B can be increased, the inner diameter of the blower tube 20 can be reduced, and not only the increase in weight can be suppressed, but also the pressure fluctuation of the internal space A due to the ventilation fan 14 Can be reduced.

FIG. 6 is a partial longitudinal sectional view showing a third embodiment of the vehicular main motor according to the present invention.
It is a figure corresponding to Claim and corresponding to Claim 4. FIG. 6 differs from FIG. 2 and FIG. 5 described above in that an open hole for communicating the negative pressure relief chamber with the outside of the outer frame is formed in the bearing plate. That is, in the right bearing plate 4C, a communication hole 18B communicating from the lower part of the negative pressure relaxation chamber 13C to the right outside of the outer frame 1B is formed symmetrically with the upper communication hole 18A.

In such a main motor for a vehicle in which the communication hole 18B is formed in the bearing plate 4C, the cooling air supplied from the blower tube 20 to the negative pressure mitigation chamber 13C is large depending on the model, and the negative pressure is reduced. When the pressure in the relaxation chamber 13C rises above the atmospheric pressure, the lubricating oil supplied to the ball bearing 5B is released from the communication hole 18B to the outside of the outer frame 1B, so that the lubricating oil is supplied to the bearing retainer 6B.
Can be prevented from flowing out from the rabins portion.

FIG. 7 is a partial longitudinal sectional view showing a fourteenth embodiment of the vehicular traction motor of the present invention, showing only the upper part of the ventilation fan. FIG. 7 corresponds to claim 5, and FIG. HH
It is sectional drawing.

FIGS. 7 and 8 correspond to FIGS. 1 to 6 shown in the above-described embodiment, and are different from FIGS. 1 to 6 in that a communication hole 21 formed in the upper left side of the outer frame 1A is formed. A guide plate for guiding a part of the cooling air discharged from the ventilation fan 14 to the communication hole is provided below.

Therefore, the shape of the rabbins formed inside the right ball bearing 5B is applicable to any of the vehicular main motors shown in FIGS. That is, FIG.
The upper end of a guide plate 16 formed in a substantially trapezoidal shape in FIG. 8 is fixed by welding to the inside of the communication hole 21 formed in the outer frame 1A shown in FIG.

The guide plate 16 is connected to the communication hole 21 of the outer frame 1A.
The main motor for a vehicle mounted below is capable of coping with a case where the exhaust cylinder 1a is large due to a difference in model or a case where the internal space A on the discharge side of the ventilation fan 14 is wide.

That is, in such a vehicular main motor, the rate of rise of the pressure in the internal space A is low, and the amount of cooling air guided to the internal space B on the right side through the air duct 20 is reduced. By providing, the decrease can be prevented.

In the above embodiment, the case of the self-ventilation type in which the outside air is introduced into the outer frame through the ventilation filter and the ventilation fan has been described. However, the contamination of the inside by dust mixed into the outside air is prevented. Even in a fully-closed type vehicle main motor in which the frequency of maintenance and inspection is reduced, the outflow of lubricating oil of the ball bearings due to the negative pressure generated in the internal space inside the bearing plate is performed by the method shown in FIGS. Can be reduced.

[0051]

As described above, according to the invention corresponding to the first aspect, a negative pressure relief chamber communicating with the lubrication part is formed on the inner peripheral side of the support part of the bearing of the rotor shaft. By connecting a communication hole formed in the outer frame and providing a blower tube for supplying a part of the cooling air discharged from the ventilation fan to the negative pressure relaxation chamber,
In particular, according to the invention corresponding to claim 2, a blower pipe for guiding a part of the cooling air discharged from the ventilation fan to the opposite side of the ventilation fan is provided, and the other end is connected to the blower pipe and the other end is a negative pressure relief chamber. Is formed in the bearing support section, and the outflow of lubricating oil from the bearing lubrication section due to the negative pressure inside the bearing support section due to the rotation of the ventilation fan is supplied to the negative pressure relief chamber Since the cooling air is suppressed by the cooling air to be provided, it is possible to obtain a vehicular main motor that can suppress an increase in the frequency of maintenance and inspection due to the outflow of the lubricating oil.

In particular, according to the invention corresponding to claim 3,
Forming a rabbins portion, which is composed of uneven portions that are loosely fitted to each other and communicates with the negative pressure relief chamber, between the oil drain having a convex cross section inserted into the rotating shaft inside the bearing on one side and the inner surface side of the bearing portion. Thus, since the decrease in the pressure of the negative pressure mitigation chamber is further suppressed by the rabins portion, it is possible to obtain a vehicle main motor that can suppress an increase in the frequency of maintenance and inspection due to the outflow of lubricating oil.

In particular, according to the invention corresponding to claim 4,
By forming an open hole communicating with the negative pressure relief chamber and the outside of the outer frame in the support part of the bearing, the pressure of the negative pressure relief chamber increases due to the supplied cooling air, and from this negative pressure relief chamber to the lubrication part When the cooling air flows in, the cooling air is discharged from the open hole to the outside of the outer frame, so that it is possible to obtain a vehicle main motor that can suppress an increase in the frequency of maintenance and inspection due to the outflow of the lubricating oil.

Further, according to the invention corresponding to claim 5, a guide plate for guiding a part of the cooling air discharged from the ventilation fan to the communication hole is provided inside the communication hole on the other side of the outer frame. When the amount of cooling air flowing into the ventilation pipe from the communication hole on the other side of the outer frame is small, the cooling air is increased by the guide plate, so that the maintenance of the maintenance and inspection due to the outflow of lubricating oil can be suppressed. An electric motor can be obtained.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view showing a first embodiment of a vehicular main motor of the present invention.

FIG. 2 is a partially enlarged detailed view of FIG. 1;

FIG. 3 is a right side view of FIG. 1;

FIG. 4 is a graph showing the operation of the first embodiment of the vehicle main motor of the present invention.

FIG. 5 is a partial vertical sectional view showing a second embodiment of the vehicular main motor of the present invention.

FIG. 6 is a partial longitudinal sectional view showing a third embodiment of the vehicular main motor of the present invention.

FIG. 7 is a partial longitudinal sectional view showing a fourth embodiment of the vehicular main motor of the present invention.

FIG. 8 is a sectional view taken along the line HH of FIG. 7;

FIG. 9 is a partial longitudinal sectional view showing an example of a conventional vehicle main motor.

FIG. 10 is a partially enlarged detailed view of FIG. 9;

[Explanation of symbols]

1A, 1B ... outer frame, 2 ... stator, 3 ... side plate, 4A, 4
B, 4C: bearing plate, 5A: roller bearing, 5B: ball bearing, 6
A, 6B: bearing retainer, 7: rotor shaft, 8: rotor core,
9: speed detector, 10A, 10B, 10C: oil drain, 11: gear disk, 12A, 12B, 12C: lavins, 13A, 13B, 13
C: negative pressure relief chamber, 14: ventilation fan, 15: ventilation filter, 16
... Guide plate, 18A, 18B ... Communication hole, 19 ... Axle, 20 ... Blower tube, 21 ... Communication hole, 22 ... Wheel, 23 ... Car body, 24 ... Rail, 25
… A truck frame.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazunori Yamawaki 2-24-24 Harumi-cho, Fuchu-shi, Tokyo Toshiba Transport Engineering Co., Ltd. In-house (72) Inventor Riki Kinoshita 1 Toshiba-cho, Fuchu-shi, Tokyo Stock Toshiba company Fuchu factory

Claims (5)

[Claims] 1. An outer frame into which a stator is inserted on an inner periphery, bearings disposed on both sides of the outer frame, and a bearing supported by the bearing via a rotor shaft, and an intermediate portion of the rotor shaft. In a vehicle main motor including a rotor having a rotor core opposed to the stator, and a ventilation fan attached to the rotor shaft, a support portion of the bearing opposite to the ventilation fan A negative pressure relief chamber communicating with the lubrication portion of the bearing is formed on the inner peripheral side of the bearing, and a blowing means for supplying a part of the cooling air discharged from the ventilation fan is provided in the negative pressure relief chamber. Vehicle main motor. 2. A ventilation pipe for guiding a part of the cooling air discharged from the ventilation fan to a side opposite to the ventilation fan, one end communicating with the ventilation pipe and the other end communicating with the negative pressure relief chamber. The main motor for a vehicle according to claim 1, wherein a communication hole communicating with the bearing is formed in a support portion of the bearing. 3. An uneven part which fits loosely between an oil drain having a convex cross section inserted into the rotary shaft inside the bearing on the opposite side of the ventilation fan and the inner surface of the bearing part. The main motor for a vehicle according to claim 1 or 2, wherein a rabbins portion communicating with the negative pressure relaxation chamber is formed. 4. The bearing according to claim 1, wherein an open hole for communicating the negative pressure relief chamber with the outside of the vehicle motor is formed in a support portion of the bearing. Main motor for vehicles. 5. The main motor for a vehicle according to claim 1, further comprising a guide plate for guiding a part of the cooling air discharged from the ventilation fan to the blower tube. .