JP2021037815A - Power transmission device - Google Patents

Abstract

To provide a power transmission device capable of reducing a power loss when loaded on a vehicle.SOLUTION: A power transmission device 10 includes a first motor 11 which can actuate an internal combustion engine 1, and which can drive an oil pump 4 that supplies an oil to a start device 3 placed between the internal combustion engine 1 and a transmission 2 via the transmission 2. The first motor 11 is rotated in the forward direction to start up the internal combustion engine 1, and the first motor 11 is rotated in the reverse direction to drive the oil pump 4.SELECTED DRAWING: Figure 1

Description

The present invention relates to a power transmission device.

Patent Document 1 discloses a vehicle drive device including a rotary electric machine, an input clutch, a torque converter, and a transmission mechanism arranged coaxially. The vehicle drive further includes an oil pump driven by a torque converter pump impeller and a member that rotates integrally with the rotor of a rotary electric machine.

Japanese Unexamined Patent Publication No. 2012-100454

In the vehicle drive device, the internal combustion engine is driven and connected so as to rotate integrally with the pump impeller of the torque converter in the engaged state of the input clutch, so that the discharge amount and the discharge pressure of the oil pump are the operating states of the engine. Depends on. Therefore, in the vehicle drive device, oil may be supplied to each part of the vehicle drive device by an oil pump at a flow rate or pressure more than necessary depending on the operating state of the engine, which may increase the power loss of the vehicle. ..

An object of the present invention is to provide a power transmission device capable of reducing power loss when mounted on a vehicle.

The present invention is configured as follows as a means for solving the above problems. That is, according to one aspect of the present invention, an oil capable of starting an internal combustion engine and supplying oil to a starting device arranged in a power transmission path between the internal combustion engine and a transmission via a transmission. A first motor capable of driving a pump is provided, and the internal combustion engine is started by rotating the first motor in the forward direction, and the oil pump is driven by rotating the first motor in the reverse direction. Provide a transmission device.

According to the power transmission device of the above aspect, since the oil pump is electrified and driven by the first motor, the oil pump is not affected by the operating state of the internal combustion engine. Therefore, for example, since the oil pump can be controlled so as to have the minimum required discharge pressure or discharge amount, it is possible to provide a power transmission device capable of reducing power loss when mounted on a vehicle.

Further, the internal combustion engine is started by rotating the first motor in the forward direction, and the oil pump is driven by rotating the first motor in the reverse direction. With such a configuration, when the oil pump is electrified, it is not necessary to provide a dedicated motor or a dedicated drive circuit, so that the manufacturing cost can be reduced by saving space, reducing the weight, and reducing the number of parts.

The schematic diagram of the power transmission device of one Embodiment of this invention. A first modification of the power transmission device of FIG. A second modification of the power transmission device of FIG. A graph showing the relationship between the driving force and the vehicle speed at each gear stage of the transmission.

Hereinafter, embodiments according to the present invention will be described with reference to the accompanying drawings. It should be noted that the following description is essentially merely an example and is not intended to limit the present invention, its application, or its use.

As shown in FIG. 1, the power transmission device 10 according to the embodiment of the present invention includes a first motor 11. The power transmission device 10 can be applied to, for example, an HEV (hybrid electric vehicle).

The first motor 11 is composed of, for example, a stator in which a coil is wound around an iron core and a rotor in which an iron core and a permanent magnet are combined, so that the internal combustion engine 1 can be started, and the internal combustion engine 1 and a transmission are used. An oil pump 4 that supplies oil to a starting device 3 such as a torque converter, a full-can joint, and a wet clutch arranged between the two and the two via a transmission 2 can be driven. The first motor 11 is arranged between the internal combustion engine 1 and the transmission 2 as an example.

The input shaft of the internal combustion engine 1, the transmission 2 and the starting device 3 are arranged coaxially with the rotating shaft 20. Further, a clutch element 5 is arranged between the internal combustion engine 1 and the output side member of the starting device 3.

Further, the power transmission device 10 further includes a switching device 15 for switching a path for transmitting the power of the first motor 11. The power transmission device 10 transmits the power of the first motor 11 to the internal combustion engine 1 and the power of the first motor 11 to the oil pump 4 as a path for transmitting the power of the first motor 11. It has a second path 14. The second route 14 is provided independently of the first route 13.

As an example, the switching device 15 includes a first one-way clutch 16 and a second one-way clutch 17. Each of the first one-way clutch 16 and the second one-way clutch 17 is configured so that the engagement / idling (that is, disengagement) relationship with respect to the rotation direction is opposite. The switching device 15 is connected to the first motor 11, and switches the path according to the rotation direction of the first motor 11. For example, when the first motor 11 is rotated in the forward direction (for example, clockwise when viewed along the direction from the internal combustion engine 1 to the transmission 2), only the first one-way clutch 16 is engaged and The second one-way clutch 17 slips and switches the path to the first path 13. Further, when the first motor 11 is rotated in the opposite direction (for example, counterclockwise when viewed along the direction from the internal combustion engine 1 to the transmission 2), only the second one-way clutch 17 is engaged. At the same time, the first one-way clutch 16 idles, and the path is switched to the second path 14.

In the power transmission device 10, the rotation shaft of the first motor 11, the rotation shaft of the oil pump 4, and the rotation shafts of the two one-way clutches 16 and 17 are all arranged coaxially.

The first path 13 is composed of a path 131 extending from the first motor 11 to the starting device 3 via the switching device 15 and a path 132 extending from the starting device 3 to the internal combustion engine 1. The path 131 extending from the first motor 11 to the starting device 3 is composed of, for example, a power transmission medium 6 such as a chain and sprocket, a belt and a pulley, a gear pair, or a traction drive.

The second path 14 is composed of, for example, a switching device 15. That is, the first motor 11 and the oil pump 4 are directly connected to the switching device 15. The second path 14 may be configured by a power transmission medium such as a chain and a sprocket, a belt and a pulley, a gear, or a traction drive, similarly to the path 131.

The second motor 12 is composed of, for example, a rotating field type synchronous motor or a variable characteristic motor (for example, the variable characteristic motor disclosed in Japanese Patent Application Laid-Open No. 2017-136902), and has a power generation function. The second motor 12 is arranged outside the starting device 3 in the radial direction with respect to the rotation shaft 20, and is directly connected to the input side member of the starting device 3.

The power transmission device 10 further includes a control device 100 that controls the first motor 11, the second motor 12, and the like. For example, switching between the first path 13 and the second path 14 is executed by the control device 100 controlling the rotation direction of the first motor 11.

As described above, according to the power transmission device 10, since the oil pump 4 is electrified and driven by the first motor 11, the oil pump 4 is not affected by the operating state of the internal combustion engine 1. Therefore, for example, since the oil pump 4 can be controlled so as to have the minimum required discharge pressure or discharge amount, it is possible to provide the power transmission device 10 capable of reducing the power loss when mounted on a vehicle.

Further, the internal combustion engine 1 is started by rotating the first motor 11 in the forward direction, and the oil pump 4 is driven by rotating the first motor 11 in the reverse direction. With such a configuration, when the oil pump 4 is electrified, it is not necessary to provide a dedicated motor or a dedicated drive circuit. Therefore, the manufacturing cost of the power transmission device 10 is reduced by saving space, reducing the weight, and reducing the number of parts. Can be reduced.

Further, a second motor 12 which is directly connected to the input side member of the starting device 3 and has a power generation function is further provided. With such a configuration, for example, it is possible to eliminate the power loss due to the use of the belt as compared with the conventional power transmission device in which the generator for power generation and the internal combustion engine are connected via the belt. Further, by starting the internal combustion engine 1 using both the first motor 11 and the second motor 12, the time required for starting the internal combustion engine 1 can be shortened as compared with the starting of the first motor 11 alone. Can be done. As a result, the combustion stop time of the internal combustion engine 1 can be increased without impairing the drivability, and the fuel consumption of the vehicle can be reduced.

Further, as a path for transmitting the power of the first motor 11, the first path 13 for transmitting the power of the first motor 11 to the internal combustion engine 1 and the first path 13 provided independently of the first path 13 are provided to provide the power of the first motor 11. Has a second path 14 for transmitting the power to the oil pump 4. Further, a switching device 15 for switching between the first path 13 and the second path 14 is further provided. With such a configuration, it is possible to easily provide a power transmission device 10 capable of reducing power loss when mounted on a vehicle.

Further, the switching device 15 is composed of a first one-way clutch 16 and a second one-way clutch 17 in which the relationship of engagement / idling (that is, disengagement) with respect to the rotation direction is opposite. With such a configuration, since it is not necessary to actively control the switching device 15, it is possible to more easily provide the power transmission device 10 capable of reducing the power loss when mounted on a vehicle.

The first motor 11 is not limited to the case where it is arranged between the internal combustion engine 1 and the transmission 2. For example, as shown in FIG. 2, the first motor 11 can be arranged so that the internal combustion engine 1 is arranged between the first motor 11 and the transmission 2. In this case, the first path 13 is directly connected to the internal combustion engine 1 from, for example, the first motor 11 via the switching device 15.

That is, the first motor 11 can start the internal combustion engine 1 and can arrange the oil pump 4 at an arbitrary position where it can be driven.

The second motor 12 is not limited to the case where it is directly connected to the input side member of the starting device 3. For example, as shown in FIG. 3, the second motor 12 can be arranged at a position where it can be connected to the internal combustion engine 1 via the power transmission medium 6.

The switching device 15 is not limited to the case where it is composed of the first one-way clutch 16 and the second one-way clutch 17, and may be composed of, for example, an electromagnetic clutch.

Table 1 shows an example of the relationship between the operation mode of the HEV provided with the power transmission device 10 and the operation state of the power transmission device 10. In each operation mode, "rotation" of "internal combustion engine" indicates whether or not the internal combustion engine 1 is rotating (stop or rotation), and "combustion" is whether or not the internal combustion engine 1 is burning (stop). Or burning). The "starting device" indicates whether or not the clutch element 5 of the starting device 3 is connected (disengaged or connected). The "first motor" and the "second motor" indicate the driving states of the motors 11 and 12, respectively. "Power running" of the "first motor" indicates a state in which the power of the first motor 11 is transmitted to the internal combustion engine 1 via the first path 13, and "stop or pump drive" means that the first motor 11 is transmitting the power. It indicates that the motor is stopped or the power of the first motor is transmitted to the oil pump 4 via the second path 14. The "power running" of the "second motor" indicates a state in which the power of the second motor 12 is transmitted to the input side member of the starting device 3, and the "idling" indicates that the second motor 12 is rotating. "Regeneration" indicates a state in which neither driving nor regeneration is performed on the input side member of the starting device 3, "regeneration" indicates a state in which energy regeneration is performed via the second motor 12, and "stop" indicates a state in which energy regeneration is performed. , Indicates a state in which the driving of the second motor 12 is stopped.

As an example, among the operation modes shown in Table 1, “Load point shift” will be described with reference to FIG. FIG. 4 shows, as an example, a high efficiency region 30 in which the combustion efficiency of the internal combustion engine 1 is high when the selection stage of the transmission gear of the HEV is “4th speed”. The lower limit of the vehicle speed in the high efficiency region 30 is V1, and the upper limit is V2. Further, the lower limit value of the driving force of the internal combustion engine 1 in the high efficiency region 30 is F1, and the upper limit value is F2.

In the "Load point shift" mode, for example, when the vehicle speed V of the HEV is between V1 and V2, but the driving force F required for this vehicle speed V is smaller than F1, the internal combustion engine 1 is placed in the high efficiency region 30. This is an operation mode in which energy is regenerated by the surplus driving force while driving the vehicle inside. For example, as shown in FIG. 4, when the driving force required for the vehicle at the vehicle speed V is Fa and the driving force within the high efficiency region 30 range of the internal combustion engine 1 at the same vehicle speed V is Fc, the internal combustion engine 1 Then, while generating the driving force Fc, the energy of the driving force Fb obtained by subtracting Fa from Fc is regenerated by the second motor 12, and the vehicle is driven by using the remaining driving force Fa.

By appropriately combining any of the various embodiments or modifications, the effects of each can be achieved. In addition, combinations of embodiments or examples or combinations of embodiments and examples are possible, and features in different embodiments or examples are also possible.

The present invention can be applied to, for example, HEVs (hybrid electric vehicles).

1 Internal combustion engine 2 Transmission 3 Starting device 4 Oil pump 5 Clutch element 6 Power transmission medium 10 Power transmission device 11 1st motor 12 2nd motor 13 1st path 131, 132 Path 14 2nd path 15 Switching device 16, 17 1 Directional clutch 20 Rotating shaft 30 High efficiency region 100 Control device

Claims (4)

A first motor capable of starting an internal combustion engine and driving an oil pump for supplying oil to a starting device arranged between the internal combustion engine and a transmission via the transmission is provided.
A power transmission device that starts the internal combustion engine by rotating the first motor in the forward direction and drives the oil pump by rotating the first motor in the reverse direction. The power transmission device according to claim 1, further comprising a second motor directly connected to an input side member of the starting device and having a power generation function. As a path for transmitting the power of the first motor, a first path for transmitting the power of the first motor to the internal combustion engine and the first path are provided independently of the first path, and the power of the first motor is transmitted to the internal combustion engine. It has a second path to transmit to the oil pump,
The power transmission device according to claim 1 or 2, further comprising a switching device for switching between the first path and the second path. The switching device is composed of a first one-way clutch and a second one-way clutch.
By rotating the first motor in the positive direction, the first one-way clutch engages and the second one-way clutch slips, so that the path is switched to the first path.
The third aspect of claim 3, wherein by rotating the first motor in the opposite direction, the second one-way clutch engages and the first one-way clutch slips and the path is switched to the second path. Power transmission device.

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