JP2009096400A - Power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission device capable of suppressing an increase in the size of the overall device by mounting an electric motor in the space which becomes unnecessary because of the decrease in capacity and miniaturization of a clutch. <P>SOLUTION: The power transmission device 10 comprises: a rotating electric machine 4 having a stator 41 positioned at the outer periphery side, and a ring-shaped rotor 42 positioned on the inner periphery side of the stator 41; a gear shift transmission 3 having an input shaft 31 to which the rotor 42 of the rotating electric machine 4 is connected, and an output shaft for converting the rotation power transmitted from the input shaft 31 by a plurality of switchable reduction gear ratios, and outputting it; a power intermitting mechanism 5 which switches the connection and cutting between the output shaft 21 of an internal combustion engine 2 and the input shaft 31 of the gear shift transmission 3, and is mounted on the inner periphery side of the rotor 42; and a control part for controlling the rotating electric machine 4, the internal combustion engine 2 and the power intermitting mechanism 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a power transmission device using a manual transmission mechanism or an automated manual transmission mechanism, and more particularly to a power transmission device for a hybrid vehicle having an electric motor as a power source.

  The internal combustion engine burns gasoline and light oil, changes the reciprocating motion due to the combustion pressure into a rotational motion by the crank mechanism, and outputs it as rotational power from the output shaft. Then, the rotational power of the internal combustion engine is converted into appropriate rotational power for rotating the wheel in a transmission (for example, a manual transmission mechanism) and then transmitted to the wheel. Since the output shaft of the internal combustion engine and the input shaft of the transmission have a difference in the rotational speed, a mechanism that abuts the friction surfaces as a clutch (power intermittent mechanism) is adopted, and the friction surfaces are gradually coupled while sliding. By doing so, both rotation speeds are made to coincide. In particular, when starting the vehicle, since the input shaft of the transmission is not rotating, in order to rotate the input shaft of the transmission, it is necessary to slide the coupling of the clutch greatly, so that the clutch generates rotational power. It is necessary to increase the transmission capacity. The clutch capacity is determined by the load at the start of the vehicle, which is the maximum load.

Incidentally, in recent years, hybrid vehicles having an electric motor (rotary electric machine) as a power source in addition to the internal combustion engine have been developed. A hybrid vehicle uses an internal combustion engine and an electric motor, and each can use an efficient driving region to improve fuel efficiency. However, when an electric motor is newly combined, there is a problem in that the size of the electric motor is increased as a whole and the mounting property on a vehicle is deteriorated and the weight is increased. For example, as shown in Non-Patent Document 1, a power transmission device mounted on a vehicle is arranged in the order of an internal combustion engine, a clutch, a motor, and a transmission. (See FIG. 2).
“Canter Eco-Hybrid Hybrid Technology”, (2) Equipped with a thin high-power motor, [online], Mitsubishi Fuso Truck and Bus Corporation, [October 3, 2007], Internet, <URL: http: // www .mitsubishi-fuso.com / jp / lineup / truck / canter_ehybrid / hybrid / mai.html>

  The present invention has been made in view of the above problems, and provides a power transmission device in which an electric motor can be mounted in a space that has become unnecessary by reducing the size and size of a clutch, thereby suppressing the overall size of the motor. This is a problem to be solved.

In order to solve the above problems, the structural feature of the invention according to claim 1 is that a rotating electrical machine having a stator located on the outer peripheral side and a ring-shaped rotor located on the inner peripheral side of the stator,
A stepped transmission mechanism having an input shaft to which the rotor of the rotating electrical machine is connected and an output shaft that converts and outputs rotational power transmitted from the input shaft at a plurality of switchable reduction ratios;
A power intermittent mechanism that switches connection and disconnection between the output shaft of the internal combustion engine and the input shaft of the stepped transmission mechanism, and is disposed on the inner peripheral side of the rotor;
And a control unit that controls the rotating electrical machine, the internal combustion engine, and the power interrupting mechanism.

  According to a second aspect of the present invention, in the first aspect, the control unit switches the power interrupting mechanism to a disconnected state, stops the internal combustion engine, drives only the rotating electric machine, and operates the rotating electric machine. An output mode is transmitted to the stepped transmission mechanism, and the engine has a start mode in which the internal combustion engine is driven by a starter when the rotational speed of the output shaft is equal to or higher than a predetermined rotational speed, and the power interrupting mechanism is switched to a connected state.

  According to a third aspect of the present invention, in the first aspect, the control unit switches the power interrupting mechanism to a disconnected state, stops the internal combustion engine, drives only the rotating electric machine, and controls the rotating electric machine. The output is transmitted to the stepped transmission mechanism, and when the rotational speed of the output shaft is equal to or higher than a predetermined rotational speed, the output of the rotating electrical machine is increased, the power interrupting mechanism is switched to the connected state, and the internal combustion engine is started by the rotating electrical machine. It has a start mode.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the control unit is configured to switch the power on / off when the plurality of reduction gear ratios of the stepped transmission mechanism are switched. A shift mode for controlling the rotation speed of the output shaft of the internal combustion engine so that the rotation speed of the output shaft of the internal combustion engine matches the rotation speed of the input shaft of the stepped transmission mechanism. It is to have.

  A structural feature of the invention according to claim 5 is that, in claim 4, the power interrupting mechanism is a spline or a meshing clutch.

  In the invention according to claim 1, since the power interruption mechanism (clutch) is arranged in the space on the inner peripheral side of the rotating electrical machine, it is possible to prevent the entire length from being increased, so that the whole is not enlarged and mounted. The power transmission device of the hybrid vehicle can be configured without deteriorating the performance. The power interrupting mechanism can be reduced in size as compared with the conventional one, and the increase in the overall size can be minimized even if the rotating electric machine is mounted.

  In the invention according to claim 2, the control unit has a start mode in which the rotating electrical machine is driven with the power interrupting mechanism disconnected, and the vehicle is started with the output of the rotating electrical machine without connecting the power interrupting mechanism. Therefore, a load due to the rotational power of the internal combustion engine is not applied to the power interrupting mechanism located between the internal combustion engine and the stepped transmission mechanism when starting. Therefore, the power interrupting mechanism can be determined without considering the start time of a vehicle with a large load, so that it can be downsized because a smaller capacity can be adopted than before. When the rotational speed (proportional to the vehicle speed) of the output shaft of the stepped transmission mechanism is equal to or higher than a predetermined rotational speed, the internal combustion engine is started by the starter because it is more efficient to be operated by the internal combustion engine.

  In the invention which concerns on Claim 3, it has a start mode in which a control part drives a rotary electric machine in the state which cut | disconnected a power interruption mechanism, and starts a vehicle by the output of a rotary electric machine, without setting a power interruption mechanism. Therefore, a load due to the rotational power of the internal combustion engine is not applied to the power interrupting mechanism located between the internal combustion engine and the stepped transmission mechanism when starting. Therefore, the power interrupting mechanism can be determined without considering the start time of a vehicle with a large load, so that it can be downsized because a smaller capacity can be adopted than before. When the rotational speed of the output shaft of the stepped transmission mechanism exceeds a predetermined rotational speed, the internal combustion engine is started because the efficiency is higher when the engine is operated by the internal combustion engine. The internal combustion engine is started by connecting the power interrupting mechanism. When starting the internal combustion engine, kinetic energy is taken from the output shaft side of the stepped transmission mechanism through the power interrupting mechanism, so that the rotation speed on the output shaft side of the stepped transmission mechanism is disturbed when the internal combustion engine is started. Since there is a risk of shock, the electric power supplied to the rotating electrical machine is increased for the purpose of supplementing the energy required for starting the internal combustion engine. The starter and alternator, which are generally necessary members, can be reduced in size or omitted, thereby reducing the cost.

  In the invention according to claim 4, since the control unit has a speed change mode for connecting the input shaft of the stepped speed change mechanism after controlling the rotation speed of the output shaft of the internal combustion engine, the power interrupting mechanism slides on the friction surface. There is no need. That is, since the speed change mode matches the rotation speeds of the output shaft of the internal combustion engine and the input shaft of the stepped transmission mechanism, a large friction surface for causing the friction to match the rotation speed is not necessary. Therefore, the power interrupting mechanism may be small when changing the gear position, and the power interrupting mechanism may be small when starting the vehicle. Can be paid. Since the power interrupt mechanism is connected after the output shaft of the internal combustion engine and the input shaft of the stepped transmission mechanism are matched, the so-called shift shock is suppressed.

  In the invention according to claim 5, since the connection between the output shaft of the internal combustion engine and the output shaft of the stepped transmission mechanism does not need to be frictionally connected by the power interrupt mechanism, the power interrupt mechanism is a high-strength transmission element. A spline or meshing clutch can be used. Thereby, the power interrupting mechanism can be remarkably reduced in size, and the weight of the entire power transmission device can be reduced.

A power transmission apparatus according to an embodiment of the present invention partially improves a power transmission apparatus incorporating a manual transmission as a stepped transmission mechanism (MT) that can be manually operated by a driver, for example, mounted on an automobile or the like. Can be realized. An automated manual stepped transmission mechanism (AMT) may be employed as the stepped transmission mechanism.
(Embodiment 1)
As shown in FIG. 1, the power transmission device 10 according to the first embodiment includes an internal combustion engine 2, a stepped transmission mechanism 3, and a rotating electrical machine 4 disposed between the internal combustion engine 2 and the stepped transmission mechanism 3. And a power interrupting mechanism 5 and a control unit (not shown).

  Examples of the internal combustion engine 2 include a gasoline engine and a diesel engine. In FIG. 1, the internal combustion engine is located on the input shaft 31 side (upstream side) of the stepped transmission mechanism 3 described later, and the output shaft 21 is connected to the output portion 421 of the rotating electrical machine 4. The internal combustion engine 2 has a fuel supply device, a throttle for controlling an air supply amount, and the like, and the supply amount of fuel and air is controlled based on a control signal from the outside. The internal combustion engine 2 has a rotation speed sensor (not shown) that detects the rotation speed of the output shaft 21 and outputs a rotation speed signal.

  The stepped transmission mechanism 3 has an input shaft 31 and an output shaft (not shown), and can convert the rotational power input from the input shaft 31 into a plurality of switchable reduction ratios and output from the output shaft. This is a gear-type stepped transmission mechanism comprising a plurality of shift stages. The input shaft 31 is coupled to the output shaft 21 of the internal combustion engine 2. The speed change mechanism 3 includes, for example, one having a fifth or sixth speed in the forward direction and a first speed in the reverse direction. The stepped speed change mechanism 3 is a mechanism for selecting a shift speed by a combination of a select operation and a shift operation, and has an actuator (not shown) for performing a select operation and a shift operation, respectively. The actuator selects a gear position by performing each operation based on a control signal from the outside. The configuration of the stepped transmission mechanism 3 is similar to that of a so-called AMT. The stepped transmission mechanism 3 has a rotation speed sensor (not shown) that detects the rotation speed of the input / output shafts 31 and 32 and outputs the rotation speed signal.

  The input shaft 31 is connected to the output shaft 21 of the internal combustion engine 2, and an output gear (not shown) that meshes with a final reduction gear (not shown) is coupled to the output shaft (not shown). The final reduction gear is connected to a differential mechanism (not shown), and the differential mechanism is connected to left and right axles (not shown) to which both drive wheels (not shown) of the vehicle are connected. When the output shaft rotates, both drive wheels rotate via the differential gear and both axles through the output gear and the final reduction gear, and the vehicle travels.

  The rotating electrical machine 4 includes a stator 41 that is positioned on the outer peripheral side and does not rotate, and a ring-shaped rotor 42 that is positioned on the inner peripheral side of the stator 41 and rotates. The rotor 42 is positioned on the outer peripheral side of the input shaft 31 of the stepped transmission mechanism 3 and is rotatably supported by the input shaft 31. The rotation shaft is an input of the output shaft 21 of the internal combustion engine 2 and the stepped transmission mechanism 3. It is coaxial with the shaft 31. The rotor 42 has an output unit 421 that is connected to the input shaft 31 of the stepped transmission mechanism 3. The rotating electrical machine 4 is used as a generator and an electric motor, and is controlled by a rotating electrical machine control device (not shown). The rotating electrical machine 4 uses a power storage device (not shown) as a power source. The electric power generated by the rotating electrical machine 4 is stored in the power storage device, and the control is performed by the rotating electrical machine control device.

  The power interrupting mechanism 5 is located between the output shaft 21 of the internal combustion engine and the input shaft 31 of the stepped transmission mechanism 3 (the output portion 421 of the rotating electrical machine 4), and the output shaft 21 of the internal combustion engine 2 and the stepped transmission mechanism. 3 is a mechanism for switching connection and disconnection with the three input shafts 31. The power interrupting mechanism 5 is disposed on the inner peripheral side of the rotor 42 of the rotating electrical machine 4 and is housed in a space formed by the rotor 42, and does not protrude in the axial direction of the rotating shaft of the rotor 42. By connecting and separating one coupling member coupled to the output shaft 21 side and a coupling member coupled to the input shaft 31 side, the rotational power between them is interrupted. The coupling member on one side is coupled so as to be slidable in the axial direction, and is intermittently connected to the other coupling member by moving the coupling member in the axial direction. The coupling member is moved by an actuator (not shown). The operation of the actuator is controlled by an external control signal. In the connected state, the output of the internal combustion engine 2 is transmitted to the stepped transmission mechanism 3, and in the disconnected state, the output of the internal combustion engine 2 is not transmitted to the stepped transmission mechanism 3, or only the output of the rotating electrical machine 4 is transmitted to the stepped transmission mechanism 3. Is done. The power interrupting mechanism 5 can use a spline or a meshing clutch (for example, a dog clutch). The power interrupting mechanism 5 itself can be downsized and the overall weight of the power transmission device 10 is reduced.

  The control unit controls the start and stop of the internal combustion engine 2, controls the driving and regeneration of the rotating electrical machine 4, and controls the power interrupt mechanism. A control part is realizable by adding the logic which performs the control shown below to ECU etc. normally mounted in vehicles, ECU provided newly, etc. The control unit outputs a rotational speed signal output from the internal combustion engine 2 and the stepped transmission mechanism 3, a vehicle speed signal indicating the speed of the vehicle on which the present apparatus is mounted, and an operation signal indicating the operation amount of an accelerator or a brake for operating the vehicle, Is input, and a control signal is output to the internal combustion engine 2, the stepped transmission mechanism 3, and the power interrupt mechanism 5.

Next, the operation of the power transmission device 10 will be described.
(1) Stop When the vehicle is determined to be stopped by the vehicle speed signal and the operation of the accelerator or the like is not performed, the internal combustion engine 2 is kept stopped. However, when the amount of power stored in the power storage device is equal to or less than a predetermined amount, the stepped transmission mechanism 2 is switched to the neutral state and the power interrupting mechanism 5 is switched to the connected state. By this switching, the output shaft 21 of the internal combustion engine 2 transmits rotational power to the output portion 421 of the rotor 42 of the rotating electrical machine 4. Since the stepped transmission mechanism 3 is in the neutral state, the rotational power input from the input shaft 31 is not transmitted to the output shaft. The operation of the internal combustion engine 2 is continued until the rotational speed of the internal combustion engine 2 is controlled and a predetermined amount or more of electric power is stored in the power storage device. When the internal combustion engine 2 is stopped, the rotating electrical machine 4 is rotated in this state to start the internal combustion engine 2.
(2) Start When it is detected from the operation of the accelerator or the like that the operator is about to start the vehicle, the following control is performed according to the start mode of the control unit.

A signal for turning off the power interrupt mechanism 5 is output. And the signal which makes the gear stage of the stepped transmission mechanism 3 the first (the gear stage with the largest reduction ratio among the gear stages) is output. And the signal which drives the rotary electric machine 4 is output to a rotary electric machine control apparatus. Rotational power from the rotating electrical machine 4 is transmitted from the output unit 421 to the input shaft 31 of the stepped transmission mechanism 3, and is converted into a first reduction ratio by the stepped transmission mechanism 3, and the final reduction gear is output from the output shaft through the output gear. Is transmitted to. Then, the vehicle starts with only the output from the rotating electrical machine 4. It is not necessary to operate a so-called half-clutch out of ordinary MT or AMT clutch operations.
(3) Starting of the internal combustion engine When the internal combustion engine 2 is stopped, after detecting that the speed of the vehicle has exceeded the predetermined speed by the vehicle speed signal, the control unit starts the internal combustion engine 2 in the start mode. Perform as follows. First, the internal combustion engine 2 is started by the starter. Then, the rotational speed of the input shaft 31 at the current shift stage is calculated from the rotational speed signal of the output shaft of the stepped transmission mechanism 3. And the signal which controls the rotation speed of the output shaft 21 of the internal combustion engine 2 is output so that the rotation speed of the output shaft 21 of the internal combustion engine 2 may correspond with the rotation speed of the input shaft 31 of the stepped transmission mechanism 3. After the number of revolutions coincides, a signal for setting the power interrupting mechanism 5 to the connected state is output. In this way, the output shaft 21 of the internal combustion engine 2 and the input shaft 31 of the stepped transmission mechanism 3 are connected by the power interrupt mechanism 5, and the vehicle travels with the output of the internal combustion engine 2. In a state where the internal combustion engine 2 is driven, the rotating electrical machine 4 can be driven to assist the traveling of the vehicle without stopping the rotating electrical machine 4 or stopping the power supply to the rotating electrical machine 4.
(4) Shifting of the gear stage of the stepped transmission mechanism The control unit performs switching of the gear stage of the stepped transmission mechanism 3 according to the shift mode as follows.
(A) Switching during traveling with only the rotating electrical machine Depending on the vehicle speed (below a predetermined vehicle speed), the gear position of the stepped transmission mechanism 3 may be switched while traveling only with the rotating electrical machine without starting the internal combustion engine 2. The power interrupt mechanism 5 is in a disconnected state. A signal for setting the gear position of the stepped transmission mechanism 3 to neutral (a state in which no gear position is selected) is output. The next gear stage is acquired, the rotational speed of the input shaft 31 is calculated from the gear stage, and the output of the rotating electrical machine 4 is controlled. When the rotational speed of the input shaft 31 is controlled, the stepped transmission mechanism 3 is shifted.
(B) Switching in a normal state (the internal combustion engine 2 is also in an operating state) When the vehicle speed is equal to or higher than a predetermined speed, the power interrupting mechanism 5 is disconnected when disconnecting from the current gear position of the stepped transmission mechanism 3. When the gear stage of the stepped speed change mechanism 3 is switched, the rotation speed of the output shaft 21 of the internal combustion engine 2 is controlled to be an appropriate speed calculated from the output shaft of the stepped speed change mechanism 3 and the selected speed stage. Later, the next gear is selected. Then, the rotational speed of the output shaft 21 of the internal combustion engine 2 is controlled so that the rotational speed of the input shaft 31 of the stepped transmission mechanism 3 and the rotational speed of the output shaft 21 of the internal combustion engine 2 coincide with each other. After that, the power interruption mechanism 5 is connected.
(5) During regeneration When it is detected that the vehicle speed is reduced from an operation such as operating the brake or returning the accelerator, the power interrupting mechanism 5 is switched to the disconnected state and the rotor 42 of the rotating electrical machine 4 is rotated to generate electric power. I do. By cutting the power interrupting mechanism 5, engine braking by the internal combustion engine 2 can be eliminated and the power generation (regeneration) efficiency of the rotating electrical machine 4 can be increased.
(Effect of Embodiment 1)
According to the power transmission device 10 of the present embodiment, since the power interruption mechanism 5 is disposed inside the rotating electrical machine 4, it is possible to prevent the entire length from being increased, and thus the overall size is not increased, and the mountability is also improved. The power transmission device of the hybrid vehicle can be configured without deteriorating.

  The controller is positioned between the internal combustion engine 2 and the stepped transmission mechanism 3 in order to drive the rotating electrical machine 4 with the power interrupting mechanism 5 disconnected in the start mode and start the vehicle with the output of the rotating electrical machine 4. The power interrupting mechanism 5 is not loaded with the rotational power of the internal combustion engine 2. Therefore, the power interrupting mechanism 5 can be of a size that does not take into account the start of a vehicle with a large load, so that a smaller one can be used.

Further, when switching the gear position of the stepped transmission mechanism 3, the control unit controls the rotational speed of the output shaft 21 of the internal combustion engine 2 and then connects the output shaft 21 to the input shaft 31 of the stepped transmission mechanism 3. It is not necessary to adjust the rotational speed by sliding the friction surface of the power interrupt mechanism 5. That is, since a large friction surface for causing friction is not required to match the rotation speed, the power interrupting mechanism 5 can be reduced in size. Therefore, the power interrupting mechanism 5 may be small not only when starting the vehicle but also when switching the gear position. If the power interrupting mechanism 5 can be reliably reduced in size, it can be accommodated inside the rotating electrical machine 4. In addition, since the power interrupt mechanism 5 is connected after the output shaft 21 of the internal combustion engine 2 and the input shaft 31 of the stepped transmission mechanism 3 are matched, the so-called shift shock is suppressed. Therefore, the comfort of a person riding in the vehicle can be improved.
(Embodiment 2)
Embodiment 2 of the present invention will be specifically described. The second embodiment basically has the same configuration and the same function and effect as the first embodiment. The following description will focus on the different parts.

The power transmission device 11 according to the second embodiment starts the internal combustion engine 2 in the start mode of the control unit without using a starter or an alternator. The internal combustion engine 2 is started by the rotating electrical machine 4. In this case, as the power interrupting mechanism, a power interrupting mechanism 6 of a type that transmits power by a frictional force is used.
(Start of internal combustion engine)
When the internal combustion engine 2 is stopped, if it is detected by the vehicle speed signal that the speed of the vehicle has exceeded a predetermined speed, a control signal for increasing the output of the rotating electrical machine 4 is output. And the signal which makes the power intermittence mechanism 6 a connection state is output. When the output shaft 21 of the internal combustion engine 2 is connected to the input shaft 31 of the stepped transmission mechanism 3 due to the connected state of the power interrupting mechanism 6, the internal combustion engine 2 is started. The energy on the output shaft side of the stepped transmission mechanism 3 temporarily decreases due to the start of the internal combustion engine 2, but during that time, it is compensated by increasing the output of the rotating electrical machine 4 and is not detected by the operator or passengers. After the start of the internal combustion engine 2 is confirmed, the power supply to the rotating electrical machine 4 is stopped and the internal combustion engine 2 runs alone. Even when the internal combustion engine 2 is driven, depending on the vehicle speed, the power supply to the rotating electrical machine 4 may not be stopped, and the rotating electrical machine 4 may also be driven to assist the traveling of the vehicle.
(Effect of Embodiment 2)
When starting the internal combustion engine 2 with the rotating electrical machine 4 without using a starter or the like, the power interrupting mechanism 6 uses a frictional power interrupting mechanism. However, the power for starting the internal combustion engine 2 is used to drive the vehicle in the stopped state to the internal combustion engine 2. Does not require as much power as starting power. Therefore, the disk-shaped friction member for bringing the power interrupting mechanism 6 into the connected state may be small. Therefore, the power interrupting mechanism 6 can be sized to fit inside the rotating electrical machine 4, and the entire length does not become longer or the entire size does not increase.

And since the internal combustion engine 2 is started with the rotary electric machine 4 without using a starter or an alternator, the starter or the like can be downsized or omitted, and the cost can be suppressed.
(Other embodiments)
As the stepped transmission mechanism 3, not an AMT but a normal MT having no actuator can be employed. In that case, it is desirable to detect both the fact that the gear stage is switched and the next gear stage to be selected when switching the gear stage. The shift operation can be smoothly advanced based on the information on the progress of the shift and the next shift stage.

  It is desirable that the shift is detected before the current shift stage is disconnected. Further, it is desirable to detect the next shift stage before the coupling (shift) is completed. It can be detected from a shift lever that selects the progress of the shift and the shift speed.

  For example, the shift stage may be switched by detecting that the driver has touched the shift lever, applied force to operate the shift lever, or moved the shift lever from the current shift position of the gate. Can be detected. As means for detecting contact with the shift lever, a contact detection sensor, a heat detection sensor, or the like that detects that the hand touches the tip of the shift lever can be considered. As a means for detecting that a force has been applied to the shift lever, a method such as detecting the occurrence of distortion in the rod-like portion is conceivable. As a means for detecting that the gate has moved from the current gear position, it is conceivable to use a sensor for detecting that the rod-shaped portion of the shift lever has passed in the middle of the gate.

  The acquisition of the next shift stage can be acquired by detecting that the shift lever has entered the next shift stage from the neutral position of the gate and has passed through the gate of that shift stage.

1 is a schematic diagram illustrating a configuration of a power transmission device 10 according to a first embodiment. It is a figure which shows an example of the conventional power transmission device.

Explanation of symbols

10, 11: power transmission device,
2: internal combustion engine, 21: output shaft,
3: Stepped transmission mechanism, 31: Input shaft,
4: rotating electrical machine, 41: stator, 42: rotor, 421: output unit 5, 6: power interrupting mechanism.

Claims (5)

A rotating electrical machine having a stator positioned on the outer peripheral side and a ring-shaped rotor positioned on the inner peripheral side of the stator;
A stepped transmission mechanism having an input shaft to which the rotor of the rotating electrical machine is connected and an output shaft that converts and outputs rotational power transmitted from the input shaft at a plurality of switchable reduction ratios;
A power intermittent mechanism that switches connection and disconnection between the output shaft of the internal combustion engine and the input shaft of the stepped transmission mechanism, and is disposed on the inner peripheral side of the rotor;
And a control unit that controls the rotating electrical machine, the internal combustion engine, and the power interrupting mechanism.   The control unit switches the power interrupting mechanism to a disconnected state, stops the internal combustion engine, drives only the rotating electrical machine, transmits the output of the rotating electrical machine to the stepped transmission mechanism, and the rotational speed of the output shaft is predetermined. 2. The power transmission device according to claim 1, further comprising: a start mode in which the internal combustion engine is driven by a starter at a rotational speed or higher and the power interrupting mechanism is switched to a connected state.   The control unit switches the power interrupting mechanism to a disconnected state, stops the internal combustion engine, drives only the rotating electrical machine, transmits the output of the rotating electrical machine to the stepped transmission mechanism, and the rotational speed of the output shaft is predetermined. The power transmission device according to claim 1, wherein the power transmission device has a start mode in which the output of the rotating electrical machine is increased at a rotational speed or more to switch the power interrupting mechanism to a connected state and the internal combustion engine is started by the rotating electrical machine.   The control unit switches the power interrupting mechanism to a disconnected state when the plurality of reduction ratios of the stepped transmission mechanism are switched, and sets the rotational speed of the output shaft of the internal combustion engine to the input of the stepped transmission mechanism. The power transmission device according to any one of claims 1 to 3, further comprising a shift mode for controlling a rotation speed of the output shaft of the internal combustion engine so as to coincide with a rotation speed of the shaft.   The power transmission device according to claim 4, wherein the power interrupting mechanism is a spline or a meshing clutch.

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