JP7201428B2 - drive unit - Google Patents

Description

The present invention relates to a drive unit that is mounted on a vehicle such as an automobile and that transmits at least driving force.

2. Description of the Related Art In recent years, vehicles equipped with a hybrid system having an engine and a drive motor as drive sources, so-called hybrid vehicles (HVs), have rapidly spread.

In an example of a hybrid system, the power of an engine is converted into electric power by a generator (motor generator for power generation), and the electric power generated by the generator is stored in a battery and used to drive a drive motor (motor generator for drive). be. The power of the drive motor is transmitted from the motor gear supported so as to rotate integrally with the rotary shaft to the differential gear, and from the differential gear to the drive wheels via the drive shaft.

The generator, drive motor and differential gear are housed in a case and integrated as a drive unit. The case contains oil for lubricating and cooling each part. Oil always accumulates in the bottom of the case, and the accumulated oil is raked up by the rotation of the differential gear and supplied to each part as droplets.

In order to actively supply oil to a rotating electric machine such as a generator, a catch tank is formed in the upper part of the case to receive and store the oil that is scraped up from the bottom, and the oil is supplied to the rotating electric machine from the catch tank. A configuration has been proposed (see Patent Document 1, for example).

JP-A-2005-83491

However, depending on the position of the catch tank, the size of the case becomes large. Therefore, devising the position of the catch tank is very important in designing the drive unit.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a drive unit in which the position of the catch tank is well devised.

In order to achieve the above object, the drive unit according to the present invention includes a case, a rotating shaft rotatably inserted through the case and rotated by a driving force, and a rotating shaft provided in the case and positioned below the rotating shaft. A rotating electric machine having a drive shaft that is displaced in both the vertical direction and the direction orthogonal to the axial direction of the rotating shaft, and a rotating electric machine that is provided in the case and accumulates at the bottom of the case due to rotation. It includes a rotating body that scoops up oil, and a wall-shaped catch tank that is at least partly arranged above the drive shaft and receives the oil that is scooped up from the bottom of the case by the rotation of the rotating body.

According to this configuration, the drive shaft of the rotating electric machine is positioned below the rotating shaft that is rotatably inserted into the case, and extends perpendicularly to both the axial direction and the vertical direction of the rotating shaft. They are staggered. Therefore, a space is created above the drive shaft due to the height difference between the position of the drive shaft and the position of the rotation shaft. This space is used to provide a catch tank for receiving oil that is scooped up by the rotation of the rotor from the bottom of the case. In this way, by sufficiently devising the position of the catch tank, it is possible to provide the catch tank while suppressing an increase in the size of the case (driving unit). of oil can be well supplied.

The drive unit may further include an oil pump provided within the case and driven by rotation of the rotary shaft, and the catch tank may be formed by abutting a wall (pump rib) protruding from the outer surface of the oil pump against the case. .

By forming the wall on the outer surface of the oil pump, the wall serves as a rib on the outer surface of the oil pump, thereby reinforcing the outer surface of the oil pump. As a result, noise caused by vibration of the oil pump can be reduced.

The drive unit may further include a parking lock mechanism arranged above the catch tank within the case.

The parking lock mechanism can be arranged by effectively using the space above the catch tank.

According to the present invention, the catch tank can be provided while suppressing an increase in the size of the case, and the necessary amount of oil can be supplied to the rotating electric machine from the catch tank.

1 is a skeleton diagram showing the configuration of a drive unit according to one embodiment of the present invention; FIG. It is a side view of the 1st case of a drive unit. It is a perspective view of a first case. FIG. 4 is a perspective view of a second case coupled with the first case; It is a perspective view of a 1st case, and a pump housing is also shown.

BEST MODE FOR CARRYING OUT THE INVENTION Below, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<Drive unit>
FIG. 1 is a skeleton diagram showing the configuration of a drive unit 1 according to one embodiment of the present invention.

A drive unit 1 is mounted on a hybrid vehicle and constitutes a hybrid system, and includes an engine 2 and motor generators 3 and 4 .

The engine 2 is provided with an electronic throttle valve for adjusting the amount of intake air into the combustion chamber of the engine 2, an injector (fuel injection device) for injecting fuel into the intake air, and a spark plug for generating electrical discharge in the combustion chamber. It is

Motor generator 3 (MG1) functions as a generator. A generator controller including an inverter and the like is connected to the motor generator 3 . The generator controller is connected to a battery composed of an assembled battery in which a plurality of secondary batteries are combined. The AC power output from the motor generator 3 is converted into DC power by the generator controller, and the DC power is supplied to the battery to charge the battery.

Motor generator 4 (MG2) functions as a drive motor. A motor controller including an inverter and the like is connected to the motor generator 4 . A battery is connected to the motor controller. The DC power output from the battery is supplied to the motor controller, the DC power is converted into AC power by the motor controller, and the AC power is supplied to the motor generator 4 to drive the motor generator 4 .

An input shaft 11 that rotates integrally with the crankshaft of the engine 2 is provided with an engine gear 12 . A generator gear 14 is provided so as to rotate together with the rotating shaft 13 of the motor generator 3 . The engine gear 12 and the generator gear 14 are in mesh with each other. The generator gear 14 has a smaller gear diameter than the engine gear 12 . Therefore, the power of the engine 2 is transmitted from the engine gear 12 to the generator gear 14 at an accelerated speed.

A motor gear 16 is provided so as to rotate integrally with the rotating shaft 15 of the motor generator 4 .

Drive unit 1 includes counter shaft 21 , counter gear 22 and differential gear 23 . Counter shaft 21 extends parallel to rotation shaft 15 of motor generator 4 . The counter gear 22 is provided so as to rotate integrally with the counter shaft 21 and meshes with the motor gear 16 . An output gear 24 is provided so as to rotate together with the counter shaft 21 . The output gear 24 meshes with a ring gear 26 coupled to the differential case 25 of the differential gear 23 .

In the drive unit 1, the power of the engine 2 is input from the engine gear 12 to the generator gear 14, and the motor generator 3 converts the power of the engine 2 input to the generator gear 14 into electric power.

The power of the motor generator 4 is transmitted to the ring gear 26 of the differential gear 23 via the motor gear 16, the counter gear 22 and the output gear 24, and is transmitted from the differential gear 23 via the drive shaft 27 to the vehicle in which the drive unit 1 is mounted. is transmitted to the drive wheels 28 of the As a result, the drive wheels 28 rotate and the hybrid vehicle runs.

<Main part configuration>
FIG. 2 is a side view of the first case 31 of the drive unit 1. FIG. FIG. 3 is a perspective view of the first case 31. FIG. FIG. 4 is a perspective view of the second case 32 coupled with the first case 31. FIG. FIG. 5 is a perspective view of the first case 31 and shows the pump housing 56 as well.

In the state in which the drive unit 1 is mounted in a hybrid vehicle, the "front side" and the "rear side" of the drive unit 1 are defined. use words.

The drive unit 1 includes a metal first case 31 and a second case 32 forming an outer shell. The first case 31 and the second case 32 are joined together to form a unit case, and are arranged adjacent to the engine in this order from the engine side.

As shown in FIGS. 2 and 3, the first case 31 has a peripheral wall 34 surrounding the accommodation space 33 and is formed so as to block the accommodation space 33 from the engine 2 side (back side with respect to the plane of FIG. 2). It integrally has a partition wall 35 with a A space 36 in which the differential gear 23 is housed is set in a portion which is the bottom of the housing space 33 and which is closer to the rear.

A drive shaft insertion portion 41 is formed in the partition wall 35 as a circular opening into which a drive shaft 27 extending from the differential gear 23 toward the engine 2 is rotatably inserted. In the partition wall 35, a first shaft insertion portion 42, through which the rotary shaft 13 of the motor generator 3 is rotatably inserted, is formed as a circular opening at a position spaced forward from the drive shaft insertion portion 41. A second shaft insertion portion 43 , through which the rotating shaft 15 of the motor generator 4 is rotatably inserted, is formed as a circular opening at a position spaced upward from the drive shaft insertion portion 41 . Further, the input shaft 11 is rotatably inserted through the partition wall 35 at a position between the first shaft insertion portion 42 and the second shaft insertion portion 43 and closer to the first shaft insertion portion 42 . The insertion portion 44 is formed as a circular opening.

An oil receiving wall 45 is formed in the partition wall 35 so as to protrude toward the housing space 33 . The oil receiving wall 45 extends back and forth between the drive shaft insertion portion 41 and the second shaft insertion portion 43 and extends upward while curving in an arc concentric with the second shaft insertion portion 43 . Further, the oil receiving wall 45 extends forward and downward at a position slightly higher than the center of the second shaft insertion portion 43 , and bends and extends forward and upward near the front end of the peripheral wall 34 . Rectangular cutouts 46 and 47 are formed in the oil receiving wall 45 at a portion positioned above the drive shaft insertion portion 41 and a portion positioned above the first shaft insertion portion 42, respectively.

As shown in FIG. 4, the second case 32 includes a first peripheral wall 52 surrounding the accommodation space 51, a partition wall 53 formed to close the accommodation space 51 from the side opposite to the first case 31 side, and a partition wall It integrally has a first peripheral wall 52 and a second peripheral wall 54 formed on the opposite side of 53 . A mechanical oil pump 55 driven by the rotation of the input shaft 11 is accommodated in the accommodation space 51 . The accommodation space surrounded by the second peripheral wall 54 accommodates the motor generators 3 and 4 .

The oil pump 55 has a pump housing 56 containing a pump gear (not shown). A wall-shaped pump rib 57 is provided on the outer surface of the pump housing 56 so as to protrude toward the first case 31 . The pump rib 57 is formed in a shape corresponding to a portion of the oil receiving wall 45 of the first case 31 that is folded back and extends forward and downward at a position slightly higher than the center of the second shaft insertion portion 43 .

When the first case 31 and the second case 32 are joined together, the accommodation space 33 surrounded by the peripheral wall 34 of the first case 31 and the accommodation space 51 surrounded by the first peripheral wall 52 of the second case 32 are integrated. Become. Then, as shown in FIG. 5, the pump rib 57 abuts against a portion of the oil receiving wall 45 that is folded back and extends forward and downward at a position slightly higher than the center of the second shaft insertion portion 43, and the oil receiving wall 45 and pump ribs 57 form a wall-like catch tank 58 .

The accommodation spaces 33 and 51 are filled with oil for lubrication and cooling of each part. Oil always accumulates in the bottoms of the accommodation spaces 33 and 51, and the accumulated oil is raked up by the rotation of the differential gear 23. - 特許庁Then, the raked oil becomes droplets and is supplied to each part. A part of the oil is received in the catch tank 58 and returned to the differential gear 23 through the notch 46 of the oil receiving wall 45 and supplied to the rotating shaft 13 of the motor generator 3 through the notch 47 of the oil receiving wall 45. .

A parking lock mechanism 61 is arranged above the catch tank 58 as shown in FIG. A hybrid vehicle in which the drive unit 1 is mounted has a shift lever (select lever) at a position that can be operated by the driver. Locks the rotary shaft 15 of the motor generator 4 when positioned. The parking lock mechanism 61 has a known structure, and includes a parking gear 62 supported by the rotary shaft 15 so as not to rotate relative to the parking pole, and a meshing portion 64 that engages and disengages from a tooth groove 63 of the parking gear 62. 65, a return spring 66 that biases the parking pole 65 in the direction in which the meshing portion 64 is separated from the tooth groove 63, and a parking rod 67 that displaces the parking pole 65 in the direction in which the meshing portion 64 engages the tooth groove 63. , a control shaft 68 to which a control cable extending from the shift lever is connected, and an inner lever 69 that converts rotation of the control shaft 68 into linear motion of the parking rod 67 .

<Effect>
As described above, the rotating shaft 13 of the motor generator 3 is positioned below the input shaft 11 rotatably inserted into the first case 31 and is positioned axially and vertically with respect to the input shaft 11 . They are arranged with their positions shifted in the front-rear direction perpendicular to both. Therefore, above the rotary shaft 13 , a space is created due to the height difference between the position of the rotary shaft 13 and the position of the input shaft 11 . Using this space, a catch tank 58 is provided to receive oil that is scraped up from the bottom inside the first case 31 by the rotation of the differential gear 23 . In this way, by sufficiently devising the position of the catch tank 58, the catch tank 58 can be provided while suppressing an increase in the size of the first case 31 (drive unit 1). , the required amount of oil can be supplied to the rotary shaft 13 of the motor generator 3.

The drive unit 1 further includes an oil pump 55 provided in the first case 31 and the second case 32 and driven by the rotation of the input shaft 11. The catch tank 58 has a pump rib 57 protruding from the outer surface of the oil pump 55. is abutted against the oil receiving wall 45 of the first case 31 .

By forming the pump ribs 57 on the outer surface of the pump housing 56 of the oil pump 55 , the pump ribs 57 serve as ribs of the pump housing 56 to reinforce the pump housing 56 . As a result, noise caused by vibration of the oil pump 55 can be reduced.

A parking lock mechanism 61 is arranged above the catch tank 58 in the first case 31 . As a result, the space above the catch tank 58 can be effectively used to dispose the parking lock mechanism 61 .

<Modification>
Although one embodiment of the present invention has been described above, the present invention can also be implemented in other forms. It is possible to apply

1: drive unit 3: motor generator (rotating electric machine)
11: Input shaft (rotating shaft)
13: Rotating shaft (drive shaft)
31: First case (case)
55: Oil pump 56: Pump housing 57: Pump rib (wall)
58: Catch tank 61: Parking lock mechanism

Claims (2)

engine and
a case;
a rotating shaft rotatably inserted through the case and rotated by the driving force of the engine ;
Rotation having a drive shaft provided in the case and arranged at a position below the rotation shaft and displaced from the rotation shaft in a vertical direction and a direction orthogonal to both the axial direction of the rotation shaft electric machine and
a rotating body that is provided in the case and that rotates to rake up oil accumulated in the bottom of the case;
a wall-shaped catch tank, at least a portion of which is disposed above the drive shaft and receives oil that is scraped up from the bottom of the case by the rotation of the rotating body ;
an oil pump provided in the case and driven by rotation of the rotating shaft ;
The drive unit , wherein the catch tank is formed by abutting a wall protruding from an outer surface of the oil pump against the case . 2. The drive unit according to claim 1 , further comprising a parking lock mechanism arranged above said catch tank within said case.

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