JP3841102B2 - Hybrid vehicle drive device - Google Patents

Description

  The present invention relates to a hybrid vehicle drive device that includes an engine and an electric motor as drive sources, and transmits a driving force of the engine or the electric motor to an axle via a transmission.

As a conventional technique, there is a technique disclosed in JP-A-11-78555. In this publication, a motor generator, a flywheel, a clutch and a transmission are sequentially connected to a crankshaft so that a starter motor that does not require a large torque can be arranged on the outer periphery of the flywheel via a ring gear. A hybrid vehicle drive device is disclosed in which a starter motor is connected to a ring gear on the outer peripheral portion of a flywheel, and the starter motor is attached to an engine via a transmission case and a motor generator housing.
Japanese Patent Laid-Open No. 11-78555

  However, in the technology disclosed in the above publication, the rotor of the motor generator, the flywheel, and the clutch that connects and disconnects the flywheel and the transmission are arranged at different axial positions on the same axis. There exists a problem that the axial direction dimension of a drive device will enlarge.

  Accordingly, in order to solve the above-described problems, it is a technical object of the present invention to provide a hybrid vehicle drive device capable of reducing the axial dimension as much as possible.

In order to solve the above problems, an invention according to claim 1 is an engine as a first drive source, a transmission to which the driving force of the engine is input, and a flywheel connected to a crankshaft of the engine. A clutch mechanism disposed between the flywheel and the input shaft of the transmission and capable of connecting / disconnecting the flywheel and the input shaft; and a second drive source connected to the input shaft. A hybrid that includes an electric motor, and a flywheel, the input shaft, the clutch mechanism, and a housing that houses the electric motor, and the driving force of at least one of the engine and the electric motor is input to the input shaft. In the vehicle drive device, the input shaft includes a shaft portion extending toward the flywheel, a connecting portion extending radially outward, and a front A cylindrical fixing portion extending from the outer diameter portion of the connecting portion toward the flywheel side in the axial direction; a rotor of the electric motor is fixed to the outer peripheral side of the fixing portion; The clutch mechanism is arranged on the inner peripheral side of the section, and the clutch mechanism is displaced by a plurality of friction elements and is supplied with fluid pressure and presses the friction elements together to connect the flywheel and the input shaft. A drum that forms a fluid pressure space between the pressing member and the inner peripheral side of the fixed portion and the friction element, and the flywheel side of the connecting portion and the pressing member. The drum is fixed to the input shaft so as to be positioned between the members, and the drum is provided with a through hole for introducing the fluid pressure into the space via the input shaft in the radial direction. the hybrid vehicle driving apparatus It was.

  The invention of claim 2 explains a specific configuration of the clutch mechanism of claim 1, and the drum is formed by pressing a thin plate.

The invention of claim 3 further specifically explains the configuration of the clutch mechanism described in claim 1, and the drum is fixed to the fixing portion with a pin.

The invention of claim 4 further specifically explains the structure of the clutch mechanism described in claim 1, and the drum is arranged on the flywheel side along the input shaft on the inner peripheral side thereof. It is to be extended.
The invention of claim 5 further specifically explains the structure of the clutch mechanism described in claim 1, and the drum is formed by pressing a thin plate and fixed to the fixing portion with a pin. The inner peripheral side extends to the flywheel side along the input shaft, and an annular plate is disposed at one end of the inner peripheral side on the flywheel side. A spring is disposed between the members to urge the pressing member in a direction in which the plate and the pressing member are separated from each other.

  According to the first aspect, since the clutch mechanism is disposed between the inner peripheral surface of the rotor and the outer peripheral surface of the input shaft, the axial positions of the clutch mechanism and the electric motor can be configured to overlap each other. . Thus, the hybrid vehicle drive device according to claim 1 can reduce the axial dimension as compared with the conventional device in which the flywheel, the electric motor, and the clutch mechanism are arranged in order.

  By configuring the clutch mechanism as described in claims 2 to 5, it is possible to further realize a configuration in which the axial position of the clutch mechanism and the axial position of the rotor of the electric motor overlap. Become.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view showing the entire hybrid vehicle drive device 1 according to the present embodiment, and FIG. 2 is a cross-sectional view showing the main part of the present invention.

  The hybrid vehicle drive device 1 includes an engine 10 that is a drive source, an electric motor 20 that is also a drive source, and a shift in which an input shaft 31 is driven in accordance with at least one of the engine 10 and the electric motor 20. A clutch mechanism 40 capable of switching connection / disconnection between the machine 30, the flywheel 12 fixed to the crankshaft 11 of the engine 10 and the input shaft 31 of the transmission 30, and the fluid pressure in the transmission 30. An electric oil pump 60 that receives the output signals of the plurality of sensors 51, 52, and 53, and a control circuit 50 that controls energization of the electric motor 20 and energization of the electric oil pump 60 based on the signals. A battery 100 connected to the circuit 50, and the flywheel 12, the electric motor 20, the clutch mechanism 40, and the input shaft 31 are Center of rotation of the record are disposed in the housing 2 so that the same axis. The transmission in the present embodiment is a planetary gear type transmission that has been generally adopted conventionally, and includes a combination of engagement and release of a plurality of friction engagement elements (not shown) in the transmission. By changing it, the gear position is switched. The rotation of the input shaft 31 is accelerated or decelerated in the transmission 30 and is transmitted to the axle 90 via the differential device 33 so that the vehicle travels.

  The electric motor 20 is fixed to the outer peripheral side of the input shaft 31 and rotates substantially integrally with the input shaft 31. The electric motor 20 is disposed on the outer periphery of the rotor 21 and protrudes radially inward. A stator 22 having a protruding portion 22 </ b> A and laminated silicon steel plates, and a coil 23 wound around the protruding portion 22 </ b> A of the stator 22 are provided. The outer peripheral side of the stator 22 is fixed to the housing 2. A rotor shaft 32 is splined to the outer peripheral side of the input shaft 31 so as to rotate integrally with the input shaft 31, and the rotor shaft 32 extends radially outward from the outer peripheral side of the input shaft 31. 32 A of connection parts and the cylindrical fixing | fixed part 32B extended toward the axial direction by the side of the flywheel 12 from the outermost diameter part of 32 A of connection parts are provided. By attaching the inner peripheral surface of the rotor 21 to the outer peripheral surface of the fixed portion 32B of the rotor shaft 32, the rotor 21 and the rotor shaft 32 are fixed, whereby the rotor 21 rotates integrally with the input shaft 31. The coil 23 is electrically connected to the control circuit 50, and the control circuit 50 is based on signals from sensors (vehicle speed sensor 51, throttle opening sensor 52, shift position sensor 53) that detect various states. The amount of current supplied to the coil or the non-energization of the coil 23 is controlled.

  The clutch mechanism 40 will be described. The clutch mechanism 40 is disposed between a plurality of annular first friction elements 42 supported on the outer peripheral side of a rotating shaft 41 that rotates following the rotation of the flywheel 12 and the plurality of first friction elements 42. The plurality of annular second friction elements 43 supported on the inner peripheral side of the fixed portion 32B of the rotor shaft 32, and the second friction elements 43 and the connecting portions 32A in the axial direction are arranged, And a pressing member 44 that presses the second friction element 43 against the first friction element 42. The rotating shaft 41 has a hollow shape, and is supported by a bearing on the outer periphery near the tip of the input shaft 31 on the inner peripheral side. A drum 45 formed by pressing a thin plate is fixed to the rotor shaft 32 by a pin 46 at a location facing the clutch mechanism 40 in the rotor shaft 32, and a liquid-tight space is provided between the pressing member 44 and the drum 45. Is configured. When the fluid pressure supplied into the space between the pressing member 44 and the drum 45 increases, the pressing member 44 is displaced toward the left side in FIG. 2, and the second friction element 43 is changed to the first friction element 42. Press against it. As a result, the second friction element 43 and the first friction element 42 are frictionally engaged, and the rotational driving force of the rotation shaft 41 is transmitted to the input shaft 31. A substantially annular plate 47 is disposed at one end of the drum 45, and a spring 48 that constantly urges the pressing member 44 toward the right side of FIG. 2 is disposed between the plate 47 and the pressing member 44. .

  The introduction of fluid pressure into the space between the pressing member 44 and the drum 45 will be described. An oil passage 31A is provided in the input shaft 31 in the axial direction, and a through-hole penetrating in the direction perpendicular to the oil passage 31A is provided in the input shaft 31, the rotor shaft 32, and the drum 45. Accordingly, the fluid pressure in the oil passage 31A is configured to be introduced between the pressing member 44 and the connecting portion 32A. The fluid pressure introduced into the oil passage 31A is adjusted by driving the electric oil pump 60 for adjusting the fluid pressure inside the transmission 30. The electric oil pump 60 is electrically connected to the control circuit 50, and the drive of the electric oil pump 60 is controlled by the control circuit 50. When the fluid pressure is introduced into the space between the pressing member 44 and the drum 45, the electric oil pump 60 rotates in the forward direction, and when the fluid pressure is discharged from the space between the pressing member 44 and the drum 45. The electric oil pump 60 reverses and discharges the fluid to the strainer 80.

  Instead of using the electric oil pump 60, a drum that is driven as the engine 10 is driven is provided, and an electromagnetic valve is provided between the pump and the oil passage 31 </ b> A to switch the energization to the drum 45. The supply / discharge of fluid pressure to / from the pressing member 44 may be switched.

  The flywheel 12 and the rotation shaft 41 of the clutch mechanism 40 are connected via a damper 70. The damper 70 includes a first rotating plate 72 connected to the flywheel 12 by bolts 71, a second rotating plate 73 that is splined to the outer periphery of the rotating shaft 41, and the first rotating plate 72 and the second rotating plate 73. And a coil spring 74 that absorbs fluctuations in rotational torque between the two rotating plates 72 and 73. A ring gear 13 is fixed to the outer periphery of the flywheel 12, and this ring gear 13 is engaged with an output shaft of a starter motor (not shown) fixed to the housing 2 and is driven by the starter motor. The wheel 12 is driven to rotate.

  The operation of the portion related to the gist of the present invention of the hybrid vehicle drive device 1 having the above-described configuration will be described. When the vehicle travels by driving only the engine 10, it is necessary to connect the crankshaft 11 and the input shaft 31 by the clutch mechanism 40. When the crankshaft 11 and the input shaft 31 are connected, fluid pressure is introduced between the pressing member 44 and the drum 45 through the oil passage 31A and the through hole by driving the electric oil pump 60, and the fluid pressure is increased. When the force that causes the pressing member 44 to be displaced to the left in FIG. 2 exceeds the biasing force of the spring 48, the pressing member 44 is displaced from the state in FIG. 2 to the left in FIG. 43 is pressed against the left side of FIG. As a result, a frictional engagement force is generated between the plurality of second friction elements 43 and the first friction elements 42 that overlap in the axial direction, and the second friction elements 43 and the first friction elements 42 are integrated. That is, the rotating shaft 41 and the rotor shaft 32 are integrated, and the rotational driving force of the rotating shaft 41 is transmitted to the input shaft 31 via the rotor shaft 32. As a result, the driving force of the engine 10 is transmitted to the input shaft 31 of the transmission 30 and the vehicle is driven by the driving force of the engine 10.

  Next, when the vehicle travels by driving only the electric motor 20, if the clutch mechanism 40 is connected to the rotary shaft 41 and the input shaft 31, it is unnecessary to drive the flywheel 12 and the crankshaft 11. A driving force is required for the electric motor 20. Therefore, when only the electric motor 20 is driven, the rotary shaft 41 and the input shaft 31 are normally separated by the clutch mechanism 40. When the rotary shaft 41 and the input shaft 31 are disconnected from the connected state, the fluid pressure in the oil passage 31 </ b> A is drained by controlling the drive of the electric oil pump 60 and connected to the pressing member 44. The fluid pressure between the part 32A is also drained from the through hole through the oil passage 31A. When the fluid pressure between the pressing member 44 and the connecting portion 32A decreases and the force of the pressing member 44 in the left direction in FIG. 2 becomes smaller than the inability of the spring 48, the pressing member 44 is pressed by the spring 48 in FIG. 2 is urged to the right, and the pressing member 44 comes into contact with the drum 45 to be in the state shown in FIG. In this way, the force by which the pressing member 44 presses the second friction element 43 against the first friction element 42 is eliminated, and the frictional engagement force between the second friction element 43 and the first friction element 42 is also exhausted. Therefore, the rotating shaft 41 and the rotor shaft 32 are separated from each other, and the electric motor 20 rotates the input shaft 31 without rotating the engine 10 side.

  Further, when the vehicle is driven by driving both the engine 10 and the electric motor 20 as driving sources, it is necessary to transmit the driving force of the engine 10 to the input shaft 31, so that the vehicle is driven only by the driving force of the engine 10. As in the case of traveling, the clutch mechanism 40 connects the rotary shaft 41 and the rotor shaft 32.

  According to the hybrid vehicle drive device 1 described above, the clutch mechanism 40 is arranged between the inner peripheral surface of the rotor 21 and the outer peripheral surface of the input shaft 31. Can overlap with each other in the axial direction. As a result, the axial dimension is shortened by the axial dimension of the clutch mechanism 40 as compared with the conventional hybrid vehicle drive device in which the flywheel 12, the electric motor 20, and the clutch mechanism 40 are sequentially arranged in the axial direction. Can be

  The embodiment of the present invention has been described above. However, the present invention is not intended to be limited to the above-described embodiment. For example, a flywheel can be provided without providing the damper 70 between the flywheel 12 and the rotating shaft. 12 and the rotary shaft 41 may be directly connected. The transmission according to the present invention is not only a planetary gear transmission that is generally used as an automatic transmission, but also a continuously variable transmission or a synchronous mesh gear transmission that is generally employed in a manual transmission. May be.

It is the schematic which shows the whole hybrid vehicle drive device in this Embodiment. It is sectional drawing which shows the principal part of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Hybrid vehicle drive device 2 ... Housing 10 ... Engine 11 ... Crankshaft 12 ... Flywheel 20 ... Electric motor 21 ... Rotor 22 ... Stator 23 ... · Coil 30 · · · Transmission 31 · · · Input shaft 32 · · · Rotor shaft 32A · · · Connection 33 · · · Differential device 40 · · · Clutch mechanism 41 · · · Rotary shaft 42 · · · 1 friction element 43 ... 2nd friction element 44 ... pressing member 50 ... control circuit 60 ... electric oil pump 70 ... damper 80 ... strainer 90 ... axle 100 ... battery

Claims (5)

An engine as a first drive source;
A transmission to which the driving force of the engine is input;
A flywheel coupled to the crankshaft of the engine;
A clutch mechanism disposed between the flywheel and the input shaft of the transmission, and capable of connecting and disconnecting the flywheel and the input shaft;
An electric motor as a second drive source coupled to the input shaft;
A housing for housing the flywheel, the input shaft, the clutch mechanism and the electric motor;
A drive device for a hybrid vehicle in which a driving force of at least one of the engine and the electric motor is input to the input shaft,
The input shaft includes a shaft portion extending toward the flywheel, a connecting portion extending radially outward, and an outer diameter portion of the connecting portion toward the flywheel side in the axial direction. It has a cylindrical fixing part that extends,
The rotor of the electric motor is fixed to the outer peripheral side of the fixed part, and the clutch mechanism is arranged on the inner peripheral side of the fixed part,
The clutch mechanism includes a plurality of friction elements, and a pressing member that is displaced by a supplied fluid pressure and presses the friction elements together to connect the flywheel and the input shaft.
A drum that forms a fluid pressure space with the pressing member is positioned between the inner peripheral side of the fixed portion and the friction element, and between the flywheel side of the connecting portion and the pressing member. The hybrid vehicle is characterized in that it is fixed to the input shaft, and the drum is provided with a through hole in the radial direction for introducing the fluid pressure into the space through the input shaft . Drive device. The drive device for a hybrid vehicle according to claim 1, wherein the drum is formed by pressing a thin plate. The drum is characterized by being pinned to the fixed portion, the hybrid vehicle drive device according to claim 1 or 2. The drum is characterized by extending in the flywheel along the input shaft at the inner peripheral side thereof, the hybrid vehicle drive device according to any one of claims 1 to 3. The drum is formed by pressing a thin plate, and is fixed to the fixing portion with a pin, and extends to the flywheel side along the input shaft on the inner peripheral side, and An annular plate is disposed at one end on the flywheel side, and a spring is disposed between the plate and the pressing member to urge the pressing member in a direction in which the plate and the pressing member are separated from each other. The hybrid vehicle drive device according to claim 1, wherein the drive device is a hybrid vehicle.

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