JP7129274B2 - rotary drive - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to a rotary drive device mounted in a drive system of a vehicle or the like.

2. Description of the Related Art In a motor generator mounted in a drive system of a vehicle, electrolytic corrosion due to shaft current and shaft voltage generated in a rotor shaft due to a potential difference between a rotor and a stator may pose a problem. Therefore, in order to prevent electrolytic corrosion, structures have been proposed so far in which the potential difference is reduced by electrically connecting the rotor and the stator with a brush or the like (see Patent Documents 1 to 3, for example). .

Japanese Unexamined Patent Application Publication No. 2011-135720 JP 2011-135722 A JP 2015-19487 A

By the way, it is desired that a rotation drive device having such a motor generator has high operational reliability.

A rotary drive device as an embodiment of the present disclosure includes a fixed portion, a moving portion, and a rotating body. The fixed part has an oil passage. The moving part is provided movably between a first relative position and a second relative position with respect to the fixed part, and moves between the first relative position with respect to the fixed part and the fixed part in accordance with a change in hydraulic pressure in the oil passage. is reversibly movable between a second relative position with respect to the . The rotating body is rotatably provided with respect to the fixed portion, is electrically connected to the fixed portion via the moving portion at the first relative position, and is disconnected from the moving portion at the second relative position. The moving part is configured to move linearly between a second relative position and a first relative position that protrudes from the fixed part beyond the second relative position in accordance with a change in hydraulic pressure.

In the rotary drive device as one embodiment of the present disclosure, the moving portion is reversibly movable between the first relative position and the second relative position in response to changes in hydraulic pressure in the oil passage. . The rotating body is electrically connected to the stationary part when the moving part is at the first relative position, and the electrical continuity between the rotating body and the stationary part is cut off when the moving part is at the second relative position. .

According to the rotary drive device as an embodiment of the present disclosure, the conduction state between the rotating body and the fixed part and the conduction between the rotating body and the fixed part are interrupted according to the change in the hydraulic pressure in the oil passage. Switching to and from the blocking state is made. Therefore, the conductive portion slides less frequently than in the case of a constant conductive state, resulting in high reliability against abrasion of the conductive portion.
In addition, when the oil pressure in the oil passage is low, that is, when fuel consumption is especially required when the engine is running at low speed and low load, the friction of the conducting portion is low, so power can be effectively transmitted.

1 is a schematic diagram showing a schematic configuration example of a vehicle drive system according to an embodiment of the present disclosure; FIG. 2 is a first schematic cross-sectional view showing a detailed configuration example of the rotary drive device shown in FIG. 1; FIG. 2 is a second schematic cross-sectional view showing a detailed configuration example of the rotary drive device shown in FIG. 1; FIG. 2B is a plan view of the guide shown in FIG. 2A; FIG. 2B is another plan view of the guide shown in FIG. 2A; FIG.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The description will be given in the following order.
1. Embodiment (an example of a vehicle drive system having a rotation drive device capable of switching between a conductive state between a rotor and a stator and an insulated state between the rotor and stator)
2. Modification

<1. Embodiment>
[Schematic Configuration of Vehicle Drive System 100]
FIG. 1 schematically illustrates a schematic configuration example of a power transmission system in a vehicle drive system 100 according to an embodiment of the present disclosure. The vehicle drive system 100 is mounted on a hybrid vehicle (hereinafter simply referred to as "vehicle") including an engine 200 and a motor generator 121, and drives the vehicle. As shown in FIG. 1, the vehicle drive system 100 includes an output shaft 110 rotated by the driving force of an engine 200, a rotary drive device 120 including a motor generator 121 for power generation, and a rotary drive device 120 including a motor generator 131 for driving the vehicle. It comprises a device 130 , a planetary gear train 140 , a planetary gear train 150 , a front wheel 160 and a propeller shaft 170 . The “engine 200” is a specific example corresponding to the “rotational driving source” of the present disclosure, and the “output shaft 110” is a specific example corresponding to the “output shaft” of the present disclosure.

It should be noted that motor generator 121 and motor generator 131 are specific examples each corresponding to the "electric motor" of the present disclosure. Propeller shaft 170 is a member that transmits driving force to rear wheels (not shown).

Vehicle drive system 100 further includes reduction gears 180 and 182 between output shaft 110 and motor generator 121, and transmission gears 190 and 192 and wheel drive shaft 210 between planetary gear mechanism 140 and motor generator 131. A coupling 230 is provided between the planetary gear mechanism 150 and the propeller shaft 170 , and a parking gear 250 , transmission gears 220 and 222 and a drive shaft 162 are provided between the motor generator 131 and the front wheel 160 .

Motor generator 121 has a drive shaft 122 that is rotationally driven by driving force from engine 200 transmitted from output shaft 110 . The drive shaft 122 is a specific example corresponding to the "rotating body" of the present disclosure. The motor generator 121 is, for example, a three-phase AC type AC synchronous motor, and mainly operates as a generator. The motor generator 121 generates electric power using the driving force from the engine 200 transmitted from the output shaft 110, and the generated electric power charges the battery 70 described later, and also drives the motor generator 131 for driving the vehicle. used as a source. The motor generator 121 is a liquid-cooled electric motor cooled by liquid such as oil circulated by an oil pump 42, which will be described later. Motor generator 121 is not limited to an AC synchronous motor, and may be an AC induction motor or a DC motor.

Planetary gear mechanism 140 has carrier 142 , pinion gear 144 , sun gear 145 and ring gear 146 . The driving force of engine 200 is transmitted from output shaft 110 to carrier 142 via reduction gears 180 and 182 and to drive shaft 122 via pinion gear 144 and sun gear 145 . Further, the driving force of the output shaft 110 of the engine 200 transmitted to the carrier 142 is transmitted to the ring gear 146 via the pinion gear 144 . The driving force of ring gear 146 is transmitted to wheel drive shaft 210 via transmission gears 190 and 192 .

The motor generator 131 is, for example, a three-phase AC type AC synchronous motor having an output shaft 132, and operates mainly as a power source for generating driving force for driving the vehicle. The motor-generator 131 is a liquid-cooled electric motor cooled by liquid such as oil circulated by the oil pump 42 , that is, an electric motor, like the motor-generator 121 . Motor generator 131 is not limited to an AC synchronous motor, and may be an AC induction motor or a DC motor. The planetary gear mechanism 150 has a pinion gear 152 , a carrier 154 and a ring gear 156 fixed to the wheel drive shaft 210 . Carrier 154 is fixed against rotation. That is, the pinion gear 152 of the planetary gear mechanism 150 does not revolve. The driving force of output shaft 132 is transmitted to ring gear 156 fixed to wheel drive shaft 210 via pinion gear 152 . As a result, the driving force of the output shaft 110 of the engine 200 and the driving force of the motor generator 131 for driving the vehicle are combined at the wheel drive shaft 210 .

The driving force of wheel drive shaft 210 is transmitted to drive shaft 162 of front wheel 160 via transmission gears 220 and 222 . Front wheels 160 are rotationally driven by the driving force of wheel drive shafts 210 transmitted to drive shafts 162 . Further, the driving force of the wheel drive shaft 210 is transmitted to the propeller shaft 170 after absorbing the difference in rotational speed between the front and rear wheels by the coupling 230 . During normal running, the rotation speed of wheel drive shaft 210 is determined by the ratio between the rotation speed of engine 200 and the rotation speed of motor generator 121 for power generation. As an example, 30% of the engine output is used for power generation by the motor generator 121 for power generation, and the remaining 70% is used for driving the wheels. The present embodiment exemplifies a full-time 4WD vehicle drive system 100 in which the driving force of the wheel drive shaft 210 is transmitted to the front wheels 160 and the rear wheels. However, the vehicle drive system 100 can also be applied to an FF type or FR type vehicle drive system in which the driving force of the wheel drive shaft 210 is transmitted to either the front wheels 160 or the rear wheels.

As shown in FIG. 1, the vehicle drive system 100 includes an engine control unit (hereinafter simply referred to as "ECU") 80, a hybrid vehicle control unit (hereinafter simply referred to as "HEV-ECU") 50, and a CAN. (Controller Area Network) 90 , a power control unit (hereinafter referred to as “PCU”) 60 , a battery 70 , an oil pan 41 , an oil pump 42 and an oil cooler 43 .

Engine 200 includes a fuel injection device, an ignition device, a throttle valve, and the like, the operation of which is controlled by ECU 80 . The ECU 80 includes a crank angle sensor that detects the rotational position (engine speed) of the output shaft 110, an accelerator pedal sensor that detects the amount of depression of the accelerator pedal, that is, the opening of the accelerator pedal, and the temperature of the cooling water of the engine 200. Various sensors such as a water temperature sensor are connected.

The ECU 80 controls the engine 200 by controlling various devices such as a fuel injection device, an ignition device, and a throttle valve based on the acquired various information and control information from the HEV-ECU 50 . In addition, the ECU 80 is adapted to transmit various information such as accelerator pedal opening, engine speed, and coolant temperature to the HEV-ECU 50 via the CAN 90 .

Oil pan 41 is a container that stores oil for lubricating and cooling motor generators 121, 131, reduction gears 180, 182, transmission gears 190, 192, 220, 222, planetary gear mechanisms 140, 150, and the like. be.

Oil pump 42 is a mechanical oil pump that supplies oil stored in oil pan 41 to motor generator 121, motor generator 131, and the like. The oil pump 42 is driven by the engine 200, sucks up the oil stored in the oil pan 41, pressurizes it, and discharges it. The oil discharged from the oil pump 42 is pressure-fed to the oil cooler 43 and then supplied to the motor generator 121, the motor generator 131, etc. through the oil passages 44, 45, etc., respectively. Oil supplied to motor generator 121 and motor generator 131 circulates inside vehicle drive system 100 and returns to oil pan 41 . In this vehicle drive system 100 , the amount of oil discharged from the oil pump 42 changes in conjunction with the rotational speed of the output shaft 110 of the engine 200 . Specifically, the amount of oil discharged from the oil pump 42 increases as the rotational speed of the output shaft 110 of the engine 200 increases, and the amount of oil discharged from the oil pump 42 increases as the rotational speed of the output shaft 110 of the engine 200 decreases. The amount of oil discharged from the engine is also reduced. As the mechanical oil pump 42, for example, a coaxial internal gear trochoid type or a chain driven vane type is preferably used.

Vehicle drive system 100 may further include an electric oil pump. The electric oil pump is driven by an electric motor when the engine 200 is stopped, for example, and can pressurize and discharge the oil stored in the oil pan 41 and pump it to the oil cooler 43 . Driving of such an electric oil pump is controlled by HEV-ECU 50 .

The oil cooler 43 is provided downstream of the oil pump 42 and is an air-cooled oil cooler that cools the oil by exchanging heat between the oil discharged from the oil pump 42 and a cooling medium such as air. . Note that the oil cooler 43 is not limited to an air-cooled oil cooler, and may be, for example, a water-cooled oil cooler that exchanges heat between oil and cooling water.

HEV-ECU 50 comprehensively controls engine 200, motor generator 121, and motor generator 131, which are driving power sources.

The HEV-ECU 50 includes, for example, a microprocessor that performs calculations, a ROM that stores programs and the like for causing the microprocessor to execute various processes, a RAM that stores various data such as calculation results, and the storage contents of which are held. and an input/output I/F.

The HEV-ECU 50 is connected to various sensors including, for example, an outside air temperature sensor that detects outside air temperature and a vehicle speed sensor that detects the speed of the vehicle. The HEV-ECU 50 is also connected to an ECU 80 that controls the engine 200, a vehicle dynamic control unit (hereinafter referred to as "VDCU") and the like via a CAN 90 so as to be able to communicate with each other. HEV-ECU 50 receives various information such as engine speed, cooling water temperature, and accelerator pedal opening from ECU 80 and VDCU via CAN 90 .

HEV-ECU 50 comprehensively controls the driving of engine 200, motor generator 121, and motor generator 131 based on the acquired various information. The HEV-ECU 50 outputs a required output of the engine 200 and a torque command of the motor generator 121 based on, for example, the accelerator pedal opening (driver's request), the operating state of the vehicle, the state of charge (SOC) of the battery 70, and the like. and the torque command value of the motor generator 131 are obtained and output.

The ECU 80 adjusts, for example, the opening of the throttle valve in the engine 200 based on the required output of the engine 200 output from the ECU 50 described above. Further, the PCU 60 drives the motor generator 121 and the motor generator 131 via an inverter 61, which will be described later, based on the torque command value output from the ECU 50 described above.

The PCU 60 has an inverter 61 and a DC-DC converter 62 . Inverter 61 converts the DC power from battery 70 into three-phase AC power and supplies it to motor generator 131 . PCU 60 drives motor generator 121 and motor generator 131 via inverter 61 based on the torque command value received from HEV-ECU 50 as described above. Inverter 61 converts AC voltage generated by motor generator 121 and motor generator 131 into DC voltage, and charges battery 70 . Also, the DC-DC converter 62 steps down the DC high voltage of the battery 70 to 12V so as to be used as a power supply for auxiliary equipment and each ECU.

[Operation of vehicle drive system 100]
(Vehicle forward motion)
When the vehicle is driven forward by vehicle drive system 100 , front wheels 160 and rear wheels are driven by the driving force of wheel drive shafts 210 . The driving force of the wheel drive shaft 210 is the driving force generated by the engine 200 minus the driving force consumed by the motor generator 121 for power generation, and the driving force generated by the motor generator 131 for driving the vehicle. are summed on the wheel drive shaft 210 . However, the vehicle drive system 100 can switch between running using only the driving force of the motor generator 131 and running using both the driving force of the engine 200 and the driving force of the motor generator 131 according to the running conditions. Also, a part of the driving force of the engine 200 is transmitted to the drive shaft 122 of the rotation drive device 120 for power generation, whereby power is generated by the motor generator 121 for power generation.

(Vehicle backward movement)
When the vehicle is driven backward by the vehicle drive system 100, the motor generator 131 for driving the vehicle is rotated in a direction opposite to that during forward movement. As a result, the wheel drive shafts 210 are rotated in the reverse direction to the forward movement of the vehicle, and the vehicle is driven backward.

[Schematic configuration of rotation drive device 120]
Next, a rotation drive device as an embodiment of the present disclosure will be described with reference to FIGS. 2A and 2B. 2A and 2B are schematic cross-sectional views enlarging a portion of rotary drive device 120 of vehicle drive system 100 shown in FIG.

As shown in FIGS. 2A and 2B, the rotary drive device 120 further includes a guide 1 provided at the end of the drive shaft 122 opposite to the planetary gear mechanism 140, and a fixed portion 2. there is In rotary drive device 120 , guide 1 and fixed portion 2 are arranged on rotation shaft 122</b>J of drive shaft 122 .

The fixed portion 2 is, for example, a housing that houses the entire vehicle drive system 100 or a member fixed to the housing, and has an oil passage 21 through which oil for cooling the motor generator 121 and the like circulates. . The oil passage 21 communicates with the oil passage 44 shown in FIG. 1, and is supplied with oil from the oil pan 41 through the oil pump 42, the oil cooler 43, and the oil passage 44 in sequence. The fixed portion 2 has a recess 22 provided in a portion of the end surface 2S of the drive shaft 122 facing the end surface 3S. The recess 22 is, for example, a substantially cylindrical space, and has a bottom surface 22S and a wall surface 22W. A part of the guide 1 is accommodated in the concave portion 22 , and the guide 1 is held by the fixing portion 2 so as to be reversibly movable along the rotation axis 122 J of the drive shaft 122 . A bottom surface 22S of the concave portion 22 is provided with a discharge port 22K through which oil is discharged from the oil passage 21 . A flange 23 is provided near the end surface 2S of the wall surface 22W of the recess 22. As shown in FIG. Further, a biasing member 24 such as a coil spring is provided in the concave portion 22 of the fixed portion 2 to bias the guide 1 toward the bottom surface 22S of the concave portion 22. As shown in FIG. The biasing member 24 includes a first end 24T1 that contacts the flange 23 and a second end 24T2 that contacts a portion of the guide 1 .

The guide 1 is a cylindrical member having a through hole 1H extending on the rotating shaft 122J, and includes a flange 11 including an end surface 11S facing the bottom surface 22S of the recess 22, and a distal end portion including an end surface 12S opposite to the end surface 11S. 12. A surface 13S of the flange 11 opposite to the end surface 11S is in contact with the second end portion 24T2 of the biasing member 24. As shown in FIG. The guide 1 is provided movably with respect to the fixed portion 2 between a first relative position L1 shown in FIG. 2A and a second relative position L2 shown in FIG. 2B. For convenience, FIGS. 2A and 2B show the first relative position L1 and the second relative position L2 based on the position of the end surface 12S. The guide 1 is a specific example corresponding to the "moving part" of the present invention.

The guide 1 moves between a first relative position L1 with respect to the fixed part 2 and a second relative position L1 with respect to the fixed part 2 according to a change in the oil pressure P in the oil passage 21 of the fixed part 2, that is, the pressure of the oil supplied to the motor generator 121. It is provided so as to be reversibly linearly movable along the rotary shaft 122J between the relative position L2. More specifically, when the hydraulic pressure P in the oil passage 21 is at a relatively high first value P1, the guide 1 is at the first relative position L1 (see FIG. 2A). This is because the biasing force of the hydraulic pressure P (=P1) in the +X direction to the guide 1 exceeds the biasing force in the -X direction of the guide 1 by the biasing member 24, so the guide 1 is pushed out in the +X direction. . On the other hand, when the hydraulic pressure P in the oil passage 21 is a relatively low second value P2 (P2<P1), the guide 1 is at the second relative position L2 (see FIG. 2B). This is because the -X direction biasing force of the biasing member 24 on the guide 1 exceeds the +X direction biasing force of the hydraulic pressure P (=P2) on the guide 1, so the guide 1 is pushed back in the -X direction. . A change in the oil pressure P in the oil passage 21 is interlocked with a change in the rotational speed of the output shaft 110 . Specifically, when the hydraulic pressure P of the oil passage 21 is the first value P1, the rotational speed of the output shaft 110 becomes the relatively high first rotational speed R1, and the hydraulic pressure P of the oil passage 21 is the second value. When it is P2, the rotational speed of the output shaft 110 becomes a second rotational speed R2 (<R1) lower than the first rotational speed R1.

3A is a plan view of the guide 1 viewed from the fixed part 2 side along the rotation axis 122J, and FIG. 3B is a plan view of the guide 1 viewed from the drive shaft 122 side along the rotation axis 122J. As shown in FIGS. 2A, 2B and 3B, a ground brush 15 made of a conductive material is erected on the outer peripheral surface 14 of the guide 1 . As shown in FIG. 3B, the ground brush 15 is provided, for example, over the entire circumference in a direction surrounding the rotating shaft 122J in a plane orthogonal to the rotating shaft 122J. As shown in FIG. 2A, when the guide 1 is in the first relative position L1, the drive shaft 122 contacts the ground brush 15. As shown in FIG. On the other hand, as shown in FIG. 2B, when the guide 1 is at the second relative position L2, the drive shaft 122 is separated from the ground brush 15. As shown in FIG. Note that the ground brush 15 is a specific example corresponding to the "conductor" of the present disclosure. Furthermore, a seal ring 16 is provided on the outer peripheral surface 14 of the guide 1 between the ground brush 15 and the end surface 12S in the direction along the rotating shaft 122J. The seal ring 16 is made of insulating resin, and its outer peripheral surface slides on the inner peripheral surface 31 of the drive shaft 122 . Further, as shown in FIG. 3A, four grooves 11G radially extending from the rotating shaft 122J are provided in the end surface 11S. The oil from the oil passage 21 also flows into these grooves 11G (Fig. 2B).

The drive shaft 122 is rotatably supported with respect to the fixed portion 2 by a bearing 25 fixed to the fixed portion 2 about a rotating shaft 122J. The drive shaft 122 is, for example, a substantially cylindrical conductive member including an inner peripheral surface 31 and an outer peripheral surface 32, and has an oil passage 33 extending along the rotating shaft 122J inside itself. The drive shaft 122 rotates while its inner peripheral surface 31 is in contact with the seal ring 16 provided on the outer peripheral surface 14 of the guide 1 . The drive shaft 122 further has a plurality of holes 34 connecting the inner peripheral surface 31 and the outer peripheral surface 32 . The tip portion 12 including the end surface 12S of the guide 1 is inserted into the oil passage 33 . Therefore, the oil passage 33 communicates with the oil passage 21 of the fixed portion 2 through the through hole 1H of the guide 1, as shown in FIGS. 2A and 2B. Therefore, the oil supplied to the oil passage 21 of the fixed portion 2 through the oil passage 44 flows into the oil passage 33 through the through hole 1H, and then is discharged to the outside of the drive shaft 122 through the plurality of holes 34. It is designed to be The oil discharged from the plurality of holes 34 to the outside of the drive shaft 122 returns to the oil pan 41 and is supplied to the motor generator 121 and the like again.

[Action and effect of rotation drive device 120]
According to the rotation drive device 120 of the present embodiment and the vehicle drive system 100 including the same, according to the change in the hydraulic pressure P in the oil passage 21, the conduction state in which the drive shaft 122 and the fixed portion 2 are conducted and the drive state are changed. Switching is made between the cutoff state in which the conduction between the shaft 122 and the fixed portion 2 is cut off. Therefore, operation reliability is higher than that in the case of constant conduction.

Specifically, in the rotary drive device 120, the drive shaft 122 is electrically connected to the fixed portion 2 via the guide 1 located at the first relative position L1. As shown in FIG. 2A, when the guide 1 is at the first relative position L1, that is, when the guide 1 is pushed in the +X direction by a relatively high hydraulic pressure P (=P1), the drive shaft 122 is grounded. This is because it comes into contact with the brush 15 . As described above, the change in the hydraulic pressure P is linked to the change in the rotational speed of the output shaft 110, and when the hydraulic pressure P is the first value P1, the rotational speed of the output shaft 110 is the relatively high first rotational speed. number R1. In such a state where the rotation speed of the output shaft 110 is high, the engine 200 is operated at high rotation and high load, the motor generator 121 generates high voltage, and the drive shaft 122 generates high shaft current and shaft voltage. . Therefore, if the electrical connection between the drive shaft 122, the guide 1, and the fixed portion 2 is cut off, the potential of the drive shaft 122, which is the rotor, is relatively higher than the potential of the fixed portion 2, which is the stator. Therefore, the bearing 25 that is fixed to the fixed portion 2 and supports the drive shaft 122 is subjected to electrolytic corrosion. However, in the rotary drive device 120, since the drive shaft 122 is electrically connected to the guide 1 and the fixed portion 2 through the ground brush 15, which is a conductor, the potential difference between the fixed portion 2 and the drive shaft 122 disappears. As a result, the occurrence of electrolytic corrosion in the bearing 25 can be effectively prevented.

On the other hand, when the oil pressure P of the oil passage 21 is the second value P2, the rotation speed of the output shaft 110 becomes a second rotation speed R2 (<R1) lower than the first rotation speed R1. In such a state, engine 200 has a low load and low speed, so the voltage generated in motor generator 121 is low. Therefore, between the drive shaft 122 and the guide 1 and the fixed portion 2, no potential difference that causes electrolytic corrosion in the bearing 25 is generated. Therefore, as shown in FIG. 2B, when the guide 1 is at the second relative position L2, the conduction between the drive shaft 122 and the fixed portion 2 is cut off. Because the hydraulic pressure P (=P2) is relatively low, the guide 1 is retracted in the -X direction by the biasing force of the biasing member 24 in the -X direction, and the drive shaft 122 is separated from the ground brush 15. In this way, when the output shaft 110 rotates at low speed and low torque, contact between the drive shaft 122 and the ground brush 15 is avoided, and the frictional resistance between them is eliminated, thereby efficiently supplying power. can be transmitted. Also, by temporarily avoiding contact between the drive shaft 122 and the ground brush 15, wear of the ground brush 15 can be reduced.

If the drive shaft and the ground brush were to be in constant contact when the motor generator was operated, friction would always occur between the drive shaft and the ground brush. In that case, there is concern about an increase in transmission loss during power transmission due to frictional resistance. In addition, the wear of the ground brush becomes conspicuous, raising concerns about an increase in the frequency of inspection and replacement. On the other hand, with the rotary drive device 120 of this embodiment, such a problem can be avoided.

Further, in this rotary drive device 120, the ground brush 15 is provided on the outer peripheral surface 14 of the guide 1, and when the guide 1 is at the first relative position L1, the ground brush 15 is housed inside the drive shaft 122, 1 is at the second relative position L2, the ground brush 15 is exposed to the outside of the drive shaft 122. As shown in FIG. Therefore, it is possible to easily confirm the degree of wear of the ground brush 15 and replace the ground brush 15 .

Further, in the present embodiment, since the biasing force in the -X direction that returns the guide 1 from the second relative position L2 to the first relative position L1 is applied to the guide 1 by the biasing member 24, The position of the guide 1 according to the hydraulic pressure P can be accurately controlled regardless of the posture.

Further, in the present embodiment, switching between conduction between the drive shaft 122 and the guide 1 and the fixed portion 2 in the rotation drive device 120 and interruption of the conduction is performed by utilizing a change in hydraulic pressure by devising a mechanical structure. automatically. Therefore, the above effects can be obtained without relying on electronic control.

<2. Variation>
Although the present disclosure has been described above with reference to the embodiments, the present disclosure is not limited to these embodiments and the like, and various modifications are possible.

For example, in the above-described embodiment, the rotation drive device 120 including the motor generator 121 for power generation is illustrated and described as a specific example corresponding to the "rotation drive device" of the present disclosure. The rotary drive device 130 including 131 may be referred to as the "rotary drive device" of the present disclosure.

In the above-described embodiment, the earth brush 15 as a conductor that abuts against the outer peripheral surface 14 of the guide 1 as a moving part is provided, and the tip portion 12 of the guide 1 is connected to the oil passage 33 of the drive shaft 122 as a rotating body. Although the electrical connection between the conductor and the rotating body is achieved by inserting, the present disclosure is not limited to this. A conductor may be provided on the inner peripheral surface of the moving part, and the conductor may slide on the outer peripheral surface of the rotating body when the moving part is in the first relative position.

For example, in the above embodiments, a vehicle drive system and a motor generator mounted on a hybrid vehicle have been illustrated and described, but the present disclosure is not limited to this. For example, it can be applied to a motor-generator in an electric vehicle and a vehicle drive system including the motor-generator. may be In addition, the “rotational drive device” of the present disclosure may be applied to any motor generator that cools by circulating liquid and that involves changes in the pressure of the liquid.

Note that the effects described in this specification are merely examples and are not limited, and other effects may be provided.

DESCRIPTION OF SYMBOLS 1... Guide, 1H... Through hole, 11... Flange, 11S-13S... End surface, 12... Tip part, 14... Outer peripheral surface, 15... Earth brush, 16... Seal ring, 2... Fixed part, 21... Oil passage, 22 Recess 22S Bottom surface 22W Wall surface 23 Flange 24 Biasing member 31 Inner peripheral surface 32 Outer peripheral surface 33 Oil passage 34 Hole 41 Oil pan 42 Oil pump 43... Oil cooler, 44, 45... Oil passage, 50... HEV-ECU, 60... PCU, 80... ECU, 90... CAN, 100... Vehicle drive system, 110, 132... Output shaft, 120, 130... Rotary drive device , 121, 131... motor generator, 122, 162... drive shaft, 122J... rotating shaft, 140, 150... planetary gear mechanism, 142, 154... carrier, 144, 152... pinion gear, 145... sun gear, 146, 156... ring gear, DESCRIPTION OF SYMBOLS 160... Front wheel, 170... Propeller shaft, 180, 182... Reduction gear, 190, 192, 220, 222... Transmission gear, 200... Engine, 230... Coupling.

Claims (9)

a fixed part having an oil passage;
provided movably between a first relative position and a second relative position with respect to the fixed portion, and the first relative position with respect to the fixed portion and the fixed portion in accordance with a change in hydraulic pressure in the oil passage; a moving part reversibly movable between a second relative position with respect to
A rotating body that is rotatably provided with respect to the fixed portion, is electrically connected to the fixed portion via the moving portion at the first relative position, and is disconnected from the moving portion at the second relative position. and
The moving part is configured to linearly move between the second relative position and the first relative position projecting from the fixed part beyond the second relative position in accordance with a change in the hydraulic pressure. is becoming
rotary drive. the moving part is capable of linear motion along a first direction;
The rotation drive device according to claim 1 , wherein the rotating body is rotatable around a rotation axis along the first direction. further comprising a conductor provided on the outer peripheral surface of the moving part,
the rotating body has an inner peripheral surface facing the outer peripheral surface of the moving portion and is provided rotatably with respect to the moving portion;
When the moving part is at the first relative position, the conductor slides on the inner peripheral surface of the rotating body,
or,
further comprising a conductor provided on the inner peripheral surface of the moving part,
the rotating body has an outer peripheral surface facing the inner peripheral surface of the moving portion and is provided rotatably with respect to the moving portion;
When the moving part is in the first relative position, the conductor slides on the outer peripheral surface of the rotating body,
3. The rotary drive device according to claim 2 . The conductor is provided on the outer peripheral surface of the moving part, and when the moving part is at the first relative position, the conductor is housed inside the rotating body, and the moving part is positioned at the second relative position. 4. The rotation drive device according to claim 3 , wherein the conductor is exposed to the outside of the rotating body when in the relative position. 5. Any one of claims 1 to 4 , further comprising a biasing member that applies a biasing force to the moving part in a direction of returning the moving part from the second relative position to the first relative position. 6. A rotary drive device according to claim 1. when the hydraulic pressure is at the first value, the moving portion is at the first relative position;
The rotary drive device according to any one of claims 1 to 5 , wherein the moving portion is at the second relative position when the hydraulic pressure is a second value lower than the first value. . A change in the hydraulic pressure is interlocked with a change in the rotation speed of the rotating body,
When the hydraulic pressure is the first value, the rotational speed of the rotor is the first rotational speed, and when the hydraulic pressure is the second value, the rotational speed of the rotor is the first rotational speed. 7. The rotary drive device according to claim 6 , wherein the second rotation speed is lower than the number of rotations. a rotary drive source;
an output shaft that rotationally drives the rotating body and that is rotationally driven by the rotational drive source;
A change in the hydraulic pressure is interlocked with a change in the rotation speed of the output shaft,
When the hydraulic pressure is the first value, the rotational speed of the output shaft is the first rotational speed, and when the hydraulic pressure is the second value, the rotational speed of the output shaft is the first rotational speed. 7. The rotary drive device according to claim 6 , wherein the second rotation speed is lower than the number of rotations. The rotation drive device according to any one of claims 1 to 8 , further comprising an electric motor that rotationally drives the rotating body.

Images