JP5192906B2 - Vehicle drive motor unit - Google Patents

Description

  The present invention relates to a vehicle drive motor unit.

  Conventionally, in a vehicle drive motor unit driven by a motor, in order to prevent the air in the motor housing and the mission housing from becoming high temperature and high pressure, the air is discharged to the outside through the breather chamber. The breather device is provided (see, for example, Patent Document 1).

In the breather device of Patent Document 1, a first breather passage communicating with the inside of the motor case and a second breather passage communicating with the lubricating oil separation chamber formed in the gear case are formed in the wall portion of the terminal box. Yes. Further, a third breather passage communicating with the first breather passage and the second breather passage above the thick portion and communicating with the outside is formed in the cover member covering the opening of the terminal box. Then, the cover member is brought into close contact with the opening above the first breather passage to prevent the lubricating oil that has entered the third breather passage from the second breather passage from entering the first breather passage.
JP 2004-68848 A

  By the way, in the breather device of Patent Document 1 described above, the breather passage that communicates between the motor case (motor housing) and the gear case (mission housing) is formed, so that air in the motor case and the gear case can be discharged. Although it can, the discharge route of the air in the sensor housing in which the rotation sensor of the motor is accommodated was not considered. That is, in order to exhaust the air in the sensor housing, it is necessary to provide a separate breather device, and the casing of the vehicle drive motor unit is enlarged, resulting in deterioration of mountability to the vehicle and a problem of weight.

  In addition, if the number of breather pipes for discharging air from the breather chamber to the outside increases, the number of routes for water to enter from the outside will increase, which may reduce the reliability of motors and rotation sensors. It was.

  Therefore, the present invention has been made in view of the above circumstances, and provides a vehicle drive motor unit that can be mounted on a vehicle and can ensure the reliability of the motor. .

  In order to solve the above-described problems, the invention described in claim 1 includes a stator portion (for example, the stator portion 21 in the embodiment) and a rotor portion (for example, in the embodiment) of a motor (for example, the motor 23 in the embodiment). A motor housing (for example, the motor housing 11 in the embodiment) that constitutes a part of a motor chamber (for example, the motor chamber 36 in the embodiment) that houses the rotor portion 22), and is fastened to one side of the motor housing. A mission chamber (for example, the mission chamber 37 in the embodiment) that constitutes a part of the motor chamber and accommodates a power transmission unit that transmits power from the output shaft of the motor (for example, the output shaft 24 in the embodiment). A constituting mission housing (for example, the mission housing 12 in the embodiment); A sensor chamber (for example, the sensor chamber 38 in the embodiment) that is fastened to the other side of the data housing and forms a part of the motor chamber and that houses the rotation sensor of the motor (for example, the rotation sensor 25 in the embodiment). In a vehicle drive motor unit (for example, the motor unit 10 in the embodiment) including a sensor housing (for example, the sensor housing 13 in the embodiment), the motor housing, the transmission housing, and an outer wall portion of the sensor housing A breather passage (for example, a breather passage 35 in the embodiment) that communicates with each other is formed in (for example, the wall portions 31, 32, and 33 in the embodiment), and a first series that communicates the breather passage with the motor chamber. A passage (for example, the first series passage 4 in the embodiment) ) Is formed in at least one of the mission housing and the sensor housing, and a second communication path (for example, the second communication path 42 in the embodiment) that connects the breather path and the sensor chamber is the sensor. A third communication passage (for example, the third communication passage 43 in the embodiment) formed in the housing and communicating between the motor chamber and the mission chamber is formed in the mission housing, communicates with the breather passage, and is lubricated with air. A breather chamber (for example, a breather chamber 51 in the embodiment) for separating oil is formed in the mission housing, and the breather chamber includes a breather pipe (for example, a breather pipe 39 in the embodiment) communicating with the outside. And the breather passage, the first series passage, the second communication passage, and the third communication passage. The motor chamber, the sensor chamber, and the mission chamber are communicated with each other.

  The invention described in claim 2 is characterized in that a fourth communication passage (for example, the fourth communication passage 44 in the embodiment) that connects the mission chamber and the breather chamber is formed.

According to the first aspect of the present invention, since the breather chamber and the chambers (motor chamber, sensor chamber, and mission chamber) constituting the vehicle drive motor unit are communicated with each other by a breather passage or the like, the breather chamber is The air in each room can be discharged outside without providing each room. Therefore, the vehicle drive motor unit can be reduced in size and weight, and the mounting property on the vehicle can be improved. Further, since the breather pipe can be integrated, the risk of water intrusion into the housing can be minimized, and the reliability of the motor can be ensured.
In general, the motor housing is provided with a water jacket so as to cover the stator portion in order to suppress the temperature rise of the stator portion of the motor, and the motor stator portion extends along the inner peripheral surface of the motor housing. It is shrink-fitted. Therefore, it is difficult to form in the motor housing a communication path that connects the breather path and the motor chamber. On the other hand, in the present invention, the air in the motor chamber can be surely discharged by forming the first series passage communicating the breather passage and the motor chamber in at least one of the mission housing and the sensor housing. . As a result, it is only necessary to form one breather passage in the vicinity of the outer periphery of the motor housing, and it does not limit the arrangement of the water jacket and the shrink fit of the stator.

  According to the second aspect of the invention, the air in the mission chamber can be guided to the breather chamber at the shortest distance by forming the fourth communication path. Therefore, the air in the mission chamber can be reliably discharged to the outside, and the reliability of the vehicle drive motor unit can be ensured.

Next, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic sectional view of a vehicle drive motor unit. As shown in FIG. 1, a vehicle drive motor unit (hereinafter referred to as a motor unit) 10 includes a motor housing 11 that houses a motor 23 having a stator portion 21 and a rotor portion 22, and one side of the motor housing 11. A transmission housing 12 that is fastened and houses a power transmission unit (not shown) that transmits power from the output shaft 24 of the motor 23, and a sensor that is fastened to the other side of the motor housing 11 and houses the rotation sensor 25 of the motor 23. And a housing 13. The mission housing 12 includes a common housing 12A fastened to the motor housing 11 and a gear housing 12B fastened to the common housing 12A. The motor housing 11 is configured as a motor chamber 36, the mission housing 12 is configured as a mission chamber 37, and the sensor housing 13 is configured as a sensor chamber 38.

  The motor housing 11 is formed in a substantially cylindrical shape so as to cover the entire motor 23. A bearing 26 that rotatably supports one end of the output shaft 24 of the motor 23 is provided on the mission housing 12 side of the boundary between the motor housing 11 and the mission housing 12, and the boundary between the motor housing 11 and the sensor housing 13. On the sensor housing 13 side, a bearing 27 that rotatably supports the other end of the output shaft 24 of the motor 23 is provided.

  Further, a breather passage 35 communicating with each other is formed in the wall portion 31 of the motor housing 11, the wall portion 32 of the transmission housing 12, and the wall portion 33 of the sensor housing 13 (see FIG. 2).

  Here, in the wall portion 31 of the motor housing 11, a water jacket 55 for cooling the motor 23 is provided on the inner peripheral side of the breather passage 35 so as to cover the entire circumference of the stator portion 21 of the motor 23. Yes. The stator portion 21 is shrink-fitted into the motor housing 11 and is disposed so as to be in close contact with the inner peripheral surface of the motor housing 11.

  The method for shrink-fitting the stator portion 21 to the motor housing 11 will be briefly described. First, the substantially cylindrical motor housing 11 is heated to a high temperature to be expanded and coaxially disposed around the stator portion 21. By cooling and contracting the motor housing 11 in this state, the stator portion 21 can be held on the inner peripheral surface of the motor housing 11.

  A breather passage 35 formed in the sensor housing 13 is formed with a first series passage 41 so as to face the motor chamber 36. With this configuration, the space on the sensor housing 13 side of the motor 23 in the motor chamber 36 and the breather passage 35 can be communicated with each other. The sensor housing 13 is formed with a second communication passage 42 that communicates the breather passage 35 and the sensor chamber 38. With this configuration, the sensor chamber 38 and the breather passage 35 can be communicated with each other.

  A partition wall 46 that partitions the motor chamber 36 and the mission chamber 37 is formed in the shared housing 12 </ b> A of the mission housing 12. The partition wall 46 is formed with a third communication passage 43 that allows the motor chamber 36 and the transmission chamber 37 to communicate with each other. With this configuration, the transmission chamber 37 can communicate with the space on the transmission housing 12 side of the motor 23 in the motor chamber 36. Also, a breather chamber 51 for separating the lubricating oil used in the motor unit 10 is formed in the mission housing 12. That is, the lubricating oil scattered by the rotation of the power transmission unit (gear) and the motor 23 can be separated in the breather chamber 51, and the lubricating oil leaks to the outside from the breather pipe 39 provided in the breather chamber 51 and communicating with the outside. This can be prevented.

  The breather chamber 51 is formed at a position corresponding to the uppermost part of the motor unit 10. The breather chamber 51 communicates with the breather passage 35 so that high-pressure and high-temperature air in the motor unit 10 can be discharged from the breather pipe 39. Further, a fourth communication passage 44 that communicates the mission chamber 37 and the breather chamber 51 is formed in a partition wall 47 that partitions the mission chamber 37 and the breather chamber 51.

  That is, the breather chamber 51 is connected to the motor chamber 36, the mission chamber 37, and the sensor chamber 38 via the breather passage 35, the first series passage 41, the second communication passage 42, the third communication passage 43, and the fourth communication passage 44. You will communicate.

  When the motor unit 10 configured as described above is driven, the rotor portion 22 and the output shaft 24 of the motor 23 rotate. Then, the motor chamber 36, the mission chamber 37, and the sensor chamber 38 are in a high temperature / high pressure state. If the high temperature and high pressure state continues in each room, the lubrication of the bearings 26 and 27 may deteriorate, and there is a risk that the stable rotation of the output shaft 24 may occur, but in this embodiment, the breather room 51 and each room (motor room) 36, the transmission chamber 37, and the sensor chamber 38) are communicated with each other by a breather passage 35 so that the air in each room can be discharged from the breather pipe 39. Therefore, the temperature and pressure in each room are suitably maintained, and the motor The reliability of the unit 10 can be improved.

  According to the present embodiment, the breather chamber 51 and each chamber (the motor chamber 36, the transmission chamber 37, and the sensor chamber 38) are configured to communicate with each other through the breather passage 35 and the like, and therefore the breather chamber 51 is provided for each chamber. The air in each room can be discharged outside. Therefore, the motor unit 10 can be reduced in size and weight, and the mounting property on the vehicle can be improved. Moreover, since the breather piping 39 can be made into one, the danger of the water permeation into the motor unit 10 can be minimized, and the reliability of the motor 23 can be ensured.

  In general, the motor housing 11 is provided with a water jacket 55 so as to cover the stator portion 21 in order to suppress the temperature rise of the stator portion 21 of the motor 23, and along the inner peripheral surface of the motor housing 11. The stator portion 21 of the motor 23 is shrink-fitted. Therefore, although it is difficult to form a communication passage in the motor housing 11 that communicates the breather passage 35 and the inside of the motor chamber 36, the first series passage 41 that communicates between the sensor housing 13 and the motor chamber 36 is provided in the sensor housing. 13, the high-temperature and high-pressure air in the motor chamber 36 can be reliably discharged. As a result, only one breather passage 35 needs to be formed in the motor housing 11 near the outer periphery.

  Further, by forming the fourth communication passage 44 in the mission housing 12, the air in the mission chamber 37 can be guided to the breather chamber 51 at the shortest distance. Therefore, the air in the mission chamber 37 can be reliably discharged to the outside, and the reliability of the motor unit 10 can be ensured.

The technical scope of the present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention. That is, the specific structure and shape described in the embodiment are merely examples, and can be changed as appropriate.
For example, in the present embodiment, the first series passage that communicates the motor chamber and the breather passage is formed only in the sensor housing, but the first series passage that communicates the motor chamber and the breather passage as shown in FIG. 41A may be formed.

It is a schematic structure sectional view of a motor unit in an embodiment of the present invention. It is sectional drawing which follows the AA line of FIG. It is a schematic structure sectional view showing another mode of a motor unit in an embodiment of the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Motor unit (drive motor unit for vehicles) 11 ... Motor housing 12 ... Transmission housing 13 ... Sensor housing 21 ... Stator part 22 ... Rotor part 23 ... Motor 24 ... Output shaft 25 ... Rotation sensor 31, 32, 33 ... Wall part 35 ... Breather passage 36 ... Motor chamber 37 ... Mission chamber 38 ... Sensor chamber 39 ... Breather piping 41, 41A ... First series passage 42 ... Second communication passage 43 ... Third communication passage 44 ... Fourth communication passage 51 ... Breather chamber

Claims (2)

A motor housing constituting a part of a motor chamber containing a stator portion and a rotor portion of the motor;
A transmission housing that is fastened to one side of the motor housing to form a part of the motor chamber, and that forms a transmission chamber that houses a power transmission unit that transmits power from the output shaft of the motor;
A vehicle drive motor unit comprising: a sensor housing that is fastened to the other side of the motor housing to form a part of the motor chamber and that forms a sensor chamber that houses a rotation sensor of the motor.
Breather passages communicating with each other are formed in outer walls of the motor housing, the mission housing and the sensor housing,
A first series passage communicating the breather passage and the motor chamber is formed in at least one of the transmission housing and the sensor housing;
A second communication passage communicating the breather passage and the sensor chamber is formed in the sensor housing;
A third communication passage communicating the motor chamber and the mission chamber is formed in the mission housing;
A breather chamber communicating with the breather passage and separating air and lubricating oil is formed in the mission housing;
The breather chamber includes a breather pipe communicating with the outside, and the motor chamber, the sensor chamber, and the mission chamber via the breather passage, the first series passage, the second communication passage, and the third communication passage. A vehicle drive motor unit characterized by being in communication.   The vehicle drive motor unit according to claim 1, wherein a fourth communication path that connects the mission chamber and the breather chamber is formed.

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