JP2017133426A - Motor-driven turbocompressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor-driven turbocompressor capable of avoiding oil from leaking via a seal mechanism to the side of a supercharger housing when too much oil is reserved in an oil reservoir.SOLUTION: A motor-driven turbocompressor 10 includes at least, a motor 4, a motor housing 5 storing the motor 4, a supercharger housing 6 arranged on the lateral side of the motor housing 5, a bearing mechanism 8 supporting a shaft 3a passing through a rotor 3, a seal mechanism 9 for sealing oil from leaking from the motor housing 5 to the supercharger housing 6, and an oil passage 5a formed in the motor housing 5. An oil reservoir 7A reserving oil O so that part of each of the bearing mechanism 8 and the seal mechanism 9 contacts the oil O is arranged below the bearing mechanism 8 and the seal mechanism 9. In the oil reservoir 7A, a discharge hole is provided for discharging part of the oil O to the outside of the motor housing 5.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electric turbo compressor mounted on a vehicle.

  In an electric turbo compressor mounted on a vehicle, a motor is built in a motor housing, shafts that penetrate the rotor constituting the motor are supported by bearing mechanisms at both ends thereof, and a turbocharger housing is provided on the side of the motor housing. A seal mechanism that is disposed and prevents oil in the motor housing from leaking to the supercharger housing is provided at the boundary between the two housings to constitute the whole.

  In order to prevent seizure of the bearing mechanism and seal mechanism described above, an attempt has been made to circulate oil by connecting the bearing mechanisms at both ends of the shaft with oil passages through which oil (lubricating oil) flows in the motor housing. ing. In addition, since oil circulates in the motor housing, the oil is likely to be scattered in the housing by the rotation of the shaft, or the housing is easily filled with oil vapor.

  The burn-in described above can occur, for example, when the electric oil pump does not start at a low temperature start and there is no oil circulation for a long time due to the electric oil pump being stopped.

  Thus, if there is no oil circulation for a long time, the viscosity of the oil increases significantly due to a decrease in the temperature of the oil. And when the viscosity of oil becomes high in this way, the torque of the electric oil pump for oil circulation tends to reach the upper limit, which may cause a situation where the electric oil pump does not start.

  For example, in the case of a fuel cell vehicle, it is necessary to operate the pump even at a low temperature because oxygen is essential as fuel in addition to the means for separately heating the oil.

  Therefore, in order to keep part of the bearing mechanism and seal mechanism in contact with oil at all times, an oil sump (or oil bath) is provided below these parts, and there is no oil until the oil pump starts at low temperature start. It is conceivable to continue the operation of the electric turbo compressor without causing the bearing mechanism or the seal mechanism to seize in the circulating state.

  Here, Patent Document 1 discloses a turbocharger with a lubricating oil supply device that can prevent seizure of a rolling bearing of the turbocharger.

  Specifically, it has a cylindrical outer ring, a cylindrical inner ring disposed on the inner peripheral side of the outer ring, a plurality of rolling elements that roll between the outer ring and the inner ring, and a pocket that holds the plurality of rolling elements. In a rolling bearing comprising a cylindrical cage disposed between the outer ring and the inner ring, and a lubricating oil that lubricates the outer ring, the inner ring, the rolling element, and the cage in contact with each other, both side surfaces of the cage in the axial direction In this embodiment, a concave groove having a depth in the axial direction is formed in the radial direction, the rolling bearing is applied to a rolling bearing of a turbocharger, and oil reservoirs are provided on both axial sides of the rolling bearing.

JP 2012-057723 A

  Also in the turbocharger with a lubricating oil supply device described in Patent Document 1, an oil sump for preventing seizure of a bearing mechanism or the like is applied.

  By the way, as described above, a seal mechanism for preventing oil in the motor housing from leaking to the turbocharger housing is provided at the boundary between the motor housing and the turbocharger housing, but the oil is accumulated in the oil reservoir. If it passes, the risk of oil leaking to the turbocharger housing side through the seal mechanism cannot be denied.

  The present invention has been made in view of the above-described problems, and in an electric turbo compressor in which an oil reservoir for preventing seizure of a bearing mechanism or the like is applied in a motor housing, when oil is excessively accumulated in the oil reservoir. Another object of the present invention is to provide an electric turbo compressor capable of eliminating oil leakage to the supercharger housing side through a seal mechanism.

  In order to achieve the above object, an electric turbo compressor according to the present invention includes a motor including a stator and a rotor, a motor housing that houses the motor, a supercharger housing that is disposed on a side of the motor housing, A bearing mechanism that supports a shaft passing through the rotor, a seal mechanism that seals oil leakage from the motor housing to the supercharger housing in the motor housing, and an oil passage formed in the motor housing; And an oil reservoir in which the oil is stored so that a part of each of the bearing mechanism and the seal mechanism comes into contact with the oil is disposed below the bearing mechanism and the seal mechanism. Part of the oil in the oil reservoir In which discharge hole for discharging the parts is provided.

  The electric turbo compressor according to the present invention includes an oil reservoir in which oil is stored so that a part of each of the bearing mechanism and the seal mechanism is in contact with the oil. It is characterized in that a discharge hole for discharging a part to the outside of the motor housing is provided in the oil reservoir.

  The bearing mechanism is provided at two positions on the left and right sides of the shaft, and the seal mechanism is provided at one position (for example, only on the left side of the shaft) on the side where the turbocharger housing exists.

  The electric turbo compressor according to the present invention aims to prevent oil leaking from the oil reservoir from entering the turbocharger housing through the seal mechanism, and therefore a part of the oil is transferred to the outside of the motor housing. The discharge hole for discharging may be provided only in the oil reservoir in which the seal mechanism exists in addition to the bearing mechanism.

  According to the electric turbo compressor of the present invention, an oil reservoir in which oil is stored so that a part of each of the bearing mechanism and the seal mechanism is in contact with the oil is disposed below the bearing mechanism and the seal mechanism. It is possible to prevent seizure of the bearing mechanism and the seal mechanism in a state of no oil circulation until the oil pump can be started at a low temperature start.

  In addition to this, since the oil reservoir is provided with a discharge hole for discharging a part of the oil to the outside of the motor housing, even if the oil is excessively accumulated in the oil reservoir, a part of the oil is passed through the discharge hole. By discharging the oil to the outside of the motor housing, it is possible to effectively eliminate oil leaking to the supercharger housing side.

  As can be understood from the above description, according to the electric turbo compressor of the present invention, an oil reservoir in which oil is stored so that a part of each of the bearing mechanism and the seal mechanism is in contact with the oil is below the bearing mechanism and the seal mechanism. The oil reservoir is provided with a discharge hole for discharging a part of the oil to the outside of the motor housing.

  With this configuration, it is possible to prevent seizure of the bearing mechanism and seal mechanism in the oil-free state until the oil pump can be started at a low temperature start, and even when the oil is excessively accumulated in the oil reservoir. By discharging a part of the oil to the outside of the motor housing through the discharge hole, it is possible to effectively eliminate the leakage of the oil to the supercharger housing side.

It is a longitudinal section of an embodiment of an electric turbo compressor of the present invention. It is an II-II arrow line view of FIG.

  Hereinafter, embodiments of an electric turbo compressor of the present invention will be described with reference to the drawings.

(Embodiment of electric turbo compressor)
FIG. 1 is a longitudinal sectional view of an electric turbo compressor according to an embodiment of the present invention, and FIG. 2 is a view taken in the direction of arrows II-II in FIG.

  The electric turbo compressor 10 shown in the figure is roughly composed of a motor 4, a motor housing 5 that houses the motor 4, and a supercharger housing 6 that is fixed to the motor housing 5.

  The motor 4 includes a stator 1 having a slot formed between teeth and teeth that protrude radially inward, and a bobbin (not shown) around the teeth of the stator 1. The coil 2 is disposed through insulating paper and the like, and the rotor 3 is disposed in the central opening of the stator 1 and through which the shaft 3a passes.

  Similarly to the stator 1, the rotor 3 is configured by laminating electromagnetic steel plates, and permanent magnets (not shown) corresponding to the number of magnetic poles are arranged in the magnet slots in the radial direction.

  The left and right portions of the shaft 3a are rotatably supported by a unique bearing mechanism 8, and on the left side of the shaft 3a, there is provided a seal mechanism 9 including a rotation-side mechanical seal 9a and a fixed-side mechanical seal 9b. The seal mechanism 9 forms a seal structure between the motor housing 5 and the supercharger housing 6.

  An oil passage 5 a is formed in the wall thickness of the housing 5. For example, in the illustrated example, the oil passage 5 a is formed so as to communicate with the left and right bearing mechanisms 8.

  Oil reservoirs 7A and 7B are disposed on the left and right sides of the shaft 3a, and positioning and fixing are achieved by snap rings 5b on the sides thereof.

  Oil O is accommodated in the left oil reservoir 7A, and a part of the bearing constituting the bearing mechanism 8 and a part of the rotating side mechanical seal 9a constituting the seal mechanism 9 come into contact with the oil O. ing.

  On the other hand, oil O is also stored in the right oil reservoir 7B, and a part of the bearing constituting the bearing mechanism 8 comes into contact with the oil O.

  The left and right oil reservoirs 7A and 7B are in fluid communication via an oil passage 5a, and the oil O is circulated to the left and right oil reservoirs 7A and 7B via the oil passage 5a.

  Thus, in the left oil reservoir 7A, a part of the bearing constituting the bearing mechanism 8 and a part of the rotating side mechanical seal 9a constituting the seal mechanism 9 are in contact with the oil O, and in the right oil sump 7B, Since part of the bearings constituting the bearing mechanism 8 is in contact with the oil O, the bearing mechanism 8 and the seal mechanism 9 are kept in a state where no oil is circulated until the oil pump can be started at a low temperature start. It becomes possible to prevent seizing.

  Further, as shown in FIG. 2, the oil reservoir 7A on the left side in which a part of the seal mechanism 9 is in contact with the oil O in addition to a part of the bearing constituting the bearing mechanism 8 has a predetermined height of the oil reservoir 7A. A discharge hole 7Aa is provided at this position.

  By providing the drain hole 7Aa in the oil reservoir 7A, even when the oil O is excessively accumulated in the oil reservoir 7A, a part of the oil O can be discharged to the outside of the motor housing 5 through the drain hole 7Aa. The oil O is effectively prevented from leaking to the supercharger housing 6 side through the seal mechanism 9.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Stator, 2 ... Coil, 3 ... Rotor, 3a ... Shaft, 4 ... Motor, 5 ... Housing (motor housing), 5a ... Oil path, 5b ... Snap ring, 6 ... Supercharger housing, 7A, 7B ... Oil Pool, 7Aa ... discharge hole, 8 ... bearing mechanism, 9 ... seal mechanism, 10 ... electric turbo compressor

Claims (1)

A motor having a stator and a rotor;
A motor housing that houses the motor;
A supercharger housing disposed on a side of the motor housing;
A bearing mechanism for supporting a shaft passing through the rotor;
A seal mechanism for sealing oil leakage from the motor housing to the supercharger housing in the motor housing;
An oil turbocompressor comprising at least an oil passage formed in the motor housing,
An oil sump for storing the oil is disposed below the bearing mechanism and the seal mechanism so that a part of each of the bearing mechanism and the seal mechanism is in contact with the oil.
The electric turbo compressor, wherein the oil reservoir is provided with a discharge hole for discharging a part of the oil to the outside of the motor housing.

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