JPH07315059A - Hybrid type electric vehicle - Google Patents

Abstract

PURPOSE:To provide lubricating mechanism that can positively supply lubricating oil to a speed increasing gear for increasing the rotating speed of an engine and a reduction gear for reducing the rotating speed of a travel motor with simple constitution in a hybrid type electric vehicle. CONSTITUTION:A hydraulic pump 26 is selectively driven by an engine 12 or a travel motor 18. At the stop time of the engine 12, a pair of second gears 50, 42 are meshed, and the hydraulic pump 26 is driven by the travel motor 18. At the operating time of the engine 12, a hydraulic actuator 28 is actuated by the pressure of an engine lubricating hydraulic pump 52 so as to mesh a pair of first gears 40, 46. The hydraulic pump 26 is thereby driven by the engine 12. Further with the hydraulic pump 26 used as the hydraulic source of a power steering, there is no need to newly provide a hydraulic pump.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hybrid electric vehicle equipped with a generator driven by an engine and a battery for traveling, and traveling by the electric power generated by the generator and the electric power stored in the battery. , A transmission for power generation that shifts the rotation of the engine and transmits it to the generator,
The present invention relates to a hydraulic pump that lubricates a traveling transmission that shifts the rotation of a motor and transmits the rotation to a drive wheel, and further supplies hydraulic oil for a power steering device mounted on an electric vehicle.

[0002]

2. Description of the Related Art In recent years, development of industrial facilities and equipment in consideration of the global environment has been actively carried out. As for automobiles as well, electric vehicles without exhaust gas have been developed, but there is a problem that the capacity of the storage battery is not yet sufficient and the continuous mileage is limited to this capacity. Further, it takes a long time to charge the storage battery, and there is a problem that it cannot be used immediately once it is discharged. Due to these problems, electric vehicles are used only for very limited purposes.

In order to supplement such a problem, a so-called hybrid electric vehicle has been developed in which a vehicle is equipped with a generator driven by an engine and the vehicle is driven by electric power generated by the generator. This hybrid electric vehicle can keep the operating condition of the engine constant and can always operate near the maximum efficiency point of the engine. Further, taking measures to remove harmful components of exhaust gas under a certain operating condition is more reliable than taking measures assuming various operating conditions, and its effect is great.

Further, the hybrid type electric vehicle called a range extender drives the engine to generate electricity by the generator only when the amount of charge of the traveling battery installed therein is less than a predetermined amount. And, during parking, etc., charging is done from a household power source, etc., to minimize the time for operating the engine. This makes it possible to further reduce exhaust gas emissions.

As described above, the hybrid electric vehicle never loses exhaust gas, but the thermal efficiency of the engine is good, so that the amount of carbon dioxide emitted can be reduced, and the harmful components in the exhaust gas can be reduced. It is also characterized in that it is relatively easy to remove.

[0006]

However, the hybrid electric vehicle as described above must be equipped with many devices such as a generator, a motor, and a battery for running as compared with a normal vehicle driven by an engine at present. In addition, these related parts must also be mounted. For example, in some hybrid electric vehicles, there are two types of transmissions, one is a traveling transmission that decelerates the rotation of the motor and transmits it to the drive wheels, and the other is a transmission that generates electricity by increasing the rotation of the engine and transmitting it to the generator. A transmission is provided, and each transmission is separately provided with a hydraulic pump for lubrication. The lubrication hydraulic pump of the traveling transmission is driven by a motor, and the lubrication hydraulic pump of the power generation transmission is driven by an engine. As described above, when the lubrication hydraulic pump is provided separately for each transmission, there is a problem in that the number of components increases.

Further, in the case of lubricating two transmissions with one hydraulic pump, in order to drive the hydraulic pump,
A separate drive from the engine and motor is required.
In a hybrid electric vehicle, it is possible that either the engine or the motor is stopped. For example, if the motor is driving a hydraulic pump, lubricating oil is supplied to the transmission for power generation while the vehicle is stopped waiting for a signal or the like. The problem arises that you cannot do that. On the contrary, when the hydraulic pump is driven by the engine, the engine is stopped in the above-mentioned range extender or the like when the charge amount of the traveling battery is sufficient, and the traveling transmission cannot be lubricated. Therefore, it is necessary to separately provide a drive source such as a motor for driving the hydraulic pump. Therefore, there is a problem that the number of parts increases.

Further, in recent years, in order to reduce the burden of steering operation, small vehicles and even light vehicles are equipped with power steering. For this purpose, a hydraulic pump using an engine as a hydraulic source of hydraulic oil is used. It is equipped. When the power steering is installed in the range extender as described above, it is necessary to secure the drive source of the hydraulic pump even when the engine is stopped.

As described above, in order to equip the power steering, a hydraulic pump is required, and there is a problem that the number of parts is increased. Further, there is a problem that a drive source capable of driving the hydraulic pump even when the engine is stopped or a hydraulic source which is changed to the hydraulic pump is required.

The present invention has been made to solve the above-mentioned problems, and lubricates the transmission for transmission and the transmission for power generation by one hydraulic pump, and further supplies hydraulic oil to the power steering. Another object of the present invention is to provide a hybrid electric vehicle capable of driving this hydraulic pump with a simple structure.

[0011]

In order to achieve the above-mentioned object, a hybrid electric vehicle according to the present invention comprises a traveling transmission that shifts the rotation of the motor and transmits the rotation to drive wheels, and the engine. A power generation transmission that shifts rotations and transmits the rotation to the generator, a single hydraulic pump that supplies lubricating oil to the traveling transmission and the power generation transmission, and a drive source of the hydraulic pump is the engine. And a drive source selecting mechanism for selecting one of the motors.

Further, the drive source selection mechanism includes a first hydraulic pump drive shaft driven by an engine, a first drive gear provided on the first hydraulic pump drive shaft, and a second hydraulic pressure driven by a motor. A pump drive shaft, a second drive gear provided on the second hydraulic pump drive shaft, and a hydraulic pump shaft integrally provided with a driven gear that selectively meshes with one of the first and second drive gears. A hydraulic pressure that operates by the hydraulic pressure of the lubricating oil of the engine, meshes the driven gear of the hydraulic pump shaft with the first driving gear when the engine is operating, and meshes the driven gear with the second driving gear when the engine is stopped. And an actuator.

As another aspect of the drive source selection mechanism, a first hydraulic pump drive shaft driven by an engine, a first one-way clutch provided on the first hydraulic pump drive shaft, and the first hydraulic pressure. A first drive gear provided on the pump drive shaft and driven via the first one-way clutch, a second hydraulic pump drive shaft driven by a motor, and a second hydraulic pump drive shaft provided on the second hydraulic pump drive shaft.
A one-way clutch, a second drive gear provided on the second hydraulic pump drive shaft and driven via the second one-way clutch, and a driven gear that is constantly meshed with both the first and second drive gears are integrated. And a hydraulic pump shaft provided in the.

Further, the above hybrid electric vehicle may be provided with a power steering device that uses the lubricating oil for the transmission discharged from the hydraulic pump as operating oil.

Further, the power steering device is provided with a limiting valve for limiting the amount of lubricating oil supplied to the two transmissions at the time of steering operation and a pressure accumulator provided in parallel with a hydraulic circuit from the hydraulic pump to the control valve. A pressure-accumulation tank including a circuit, the pressure-accumulation circuit accumulating high-pressure hydraulic oil generated by a hydraulic pump, a check valve for guiding the high-pressure hydraulic oil to the pressure accumulation tank when the hydraulic pump discharge pressure is equal to or higher than a predetermined value, and It is also possible to have a hydraulic pump and a selection valve that guides the hydraulic oil having a higher pressure in the accumulator tank to the control valve.

[0016]

The present invention has the above-mentioned structure, and the number of lubricating hydraulic pumps is reduced by providing a single hydraulic pump that lubricates both the traveling transmission and the power generation transmission. be able to. Furthermore, by selectively driving this hydraulic pump with an engine or a motor, a simple structure can be realized without providing a new drive source.

Further, the drive source of the hydraulic pump is selected by utilizing the oil pressure of the lubricating oil of the engine. When the engine is operating, the drive source is the engine, and when the engine is stopped, the drive source is the motor by a simple mechanism. Can be realized.

Further, by providing a one-way clutch on each of the hydraulic pump drive shaft from the engine and the hydraulic pump drive shaft from the motor, the hydraulic pump is driven by the drive source having a higher rotational speed on the hydraulic pump shaft. be able to. That is, when the engine is stopped, the hydraulic pump is driven by the motor, and when the engine is operating, the hydraulic pump is driven by the engine when the vehicle is stopped or the vehicle runs at a low speed where the rotation of the motor is extremely low.

Furthermore, by using the lubricating oil discharged from the hydraulic pump as hydraulic oil, the power steering can be equipped without providing a new hydraulic pump. Further, since the hydraulic pump is driven by the engine or the motor, it is possible to assist the steering operation even when either of them is stopped.

Further, in the case of having a pressure accumulator circuit for accumulating high-pressure hydraulic oil in the accumulator tank, the engine is stopped,
Moreover, the steering operation can be assisted even when the rotation of the motor is low or is stopped.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic configuration of the hybrid electric vehicle of this embodiment, particularly the power plant portion. The vehicle body 10 has an engine 12 through a gearbox 14.
The generator 16 driven by is mounted. In this embodiment, in order to make the generator compact, the engine 1
The rotation speed of 2 is increased by the speed increaser 14. Due to this speed increase, it is possible to generate the necessary electric power with a small generator even at a relatively low engine speed. Also, the car body 1
A traveling motor 18 is mounted at 0, is decelerated by a speed reducer 20, and tires 24 are driven via left and right drive shafts 22. Although not shown in the figure, the left and right drive shafts 22 are connected via a differential mechanism, and are configured to absorb the rotational difference between the left and right wheels when turning.

As described above, in this embodiment, the speed-increasing gear 14 (transmission) for increasing the engine speed and transmitting it to the generator and the decelerating speed of the traveling motor for transmission to the tire. Two transmissions, a reduction gear 20 (transmission), are provided. A hydraulic pump 26 for supplying lubricating oil to the two transmissions is provided. A known pump can be used as the hydraulic pump 26, and for example, a trochoid pump or a gear pump is used. The hydraulic pump 26 is driven by either the engine 12 or the traveling motor 18. When driven by the engine 12, a part of the driving force of the engine is split from the speed increaser 14 and is driven via the branch transmission mechanism 14a. When driven by the traveling motor 18, part of the engine driving force is split from the speed reducer 20, and the branch transmission mechanism 20
Driven via a. The hydraulic actuator 28 selects two drive sources of the engine 12 and the traveling motor 18. The hydraulic source of the hydraulic actuator 28 is a hydraulic pump for engine lubricating oil. This gearbox 1
4 and the lubricating oil from the lubricating hydraulic pump 26 of the speed reducer 20 are supplied to the speed increaser 14 through the pipe 30, and the pipe 3
2 to the speed reducer 20. Lubricating oil is collected from the transmissions 14 and 20 through the pipes 34 and 36, and the transmissions 14 and 2 are recovered by the hydraulic pump 26 again.
Supplied to zero.

2 and 3 are explanatory views of the operation of this embodiment. The same reference numerals are given to the components described in FIG. In this figure, the main bodies of the speed increaser 14 and the speed reducer 20 are omitted, and the respective branch transmission mechanisms 14a, 20 are omitted.
Only a is listed. The hydraulic pump 26 has a hydraulic pump shaft 38 that transmits the power from the drive source to the hydraulic pump and rotates the hydraulic pump. When the hydraulic pump 26 is a trochoid pump, the hydraulic pump shaft 38
Rotates the inner gear of the pump. When the hydraulic pump 26 is a gear pump, the hydraulic pump shaft 38 rotationally drives one gear of the pump. Hydraulic pump shaft 38
Is driven through the hydraulic pump 26, and two driven gears 40 and 42 are integrally provided with the hydraulic pump shaft 38 at both ends thereof. The first driven gear 40 is provided in the speed increaser branch transmission mechanism 14 a and is provided in the first hydraulic pump drive shaft 44 driven by the engine 12.
It is arranged at a position where it can be selectively meshed with the drive gear 46. In addition, the second driven gear 42 is provided in the speed reducer branch transmission mechanism 20 a and selectively to the second drive gear 50 provided on the second hydraulic pump drive shaft 48 driven by the traveling motor 18. It is arranged at a position where it can be engaged. In addition, the axial movement of the hydraulic pump shaft 38 causes the first
The meshing of the drive gear 46 and the first driven gear 40 (hereinafter referred to as the first gear pair) is selected, and similarly, the second drive gear 5
The engagement between 0 and the second driven gear 42 (hereinafter referred to as the second gear pair) is selected. Further, one of the first gear pair 46, 40 and the second gear pair 50, 42 is configured to selectively mesh. Further, the hydraulic pump shaft 38 is moved to the right in the drawing, that is, the second gear pair 50, by a spring (not shown).
It is urged in the direction in which 42 is engaged.

The hydraulic actuator 28 moves the hydraulic pump shaft 38 in the axial direction. As described above, the hydraulic source of the hydraulic actuator 28 is the hydraulic pump 52 for engine lubricating oil, and this hydraulic pressure is guided by the pipe 54. Then, the hydraulic pump shaft 38 is moved via the rod 56.

FIG. 2 shows the apparatus of this embodiment when the engine 12 is stopped. As described above, the hydraulic pump shaft 38 is biased to the right by the spring, and the second gear pair. 50 and 42 are in the engaged position. Engine 12
When the vehicle is stopped, the vehicle may be completely stopped and is not being driven, and in the range extender described above, the charge amount of the traveling battery may be sufficient. When the vehicle is completely stopped, each transmission 14, 2
It is not necessary to lubricate 0, but when traveling by the traveling motor 18, it is necessary to lubricate at least the speed reducer 20. In this embodiment, since the hydraulic pump 26 is driven by the traveling motor when the engine is stopped, the reduction gear 20 can be reliably lubricated.

FIG. 3 shows the apparatus of this embodiment when the engine 12 is operating. When the engine 12 starts operating, the engine lubrication hydraulic pump 52 begins to discharge lubricating oil. This lubricating oil is guided to the hydraulic actuator 28 by the pipe 54, and moves the rod 56 from the state of FIG. 2 to the left in the figure. The hydraulic pump shaft 38 moves against this rod 56 against the biasing force of the spring, and the first gear pair 4
6 and 40 are in mesh with each other, and at the same time, the second gear pair 50 and 42 are in a disengaged state. In this way, the hydraulic pump 26 is driven by the engine 12 when the engine 12 is operating. Engine 1
Although it is necessary to supply the lubricating oil to the speed increaser 14 at all times when the engine 2 is operating, in the present embodiment, the engine 12
Since the hydraulic pump 26 is driven as long as is rotating, the supply of lubricating oil is not interrupted. Further, even when the vehicle is stopped due to waiting for a signal or the like and it is not necessary to supply the lubricating oil to the speed reducer 20, as long as the engine 12 is rotating, the speed increasing gear 14 is supplied with the lubricating oil. It

As described above, in this embodiment, since the hydraulic pump 26 is driven by the engine 12 when the engine 12 is operating, the speed increaser 14 which must be lubricated while the engine 12 is operating. The supply of lubricating oil is not interrupted. Further, since the hydraulic pump 26 is driven by the traveling motor 18 when the engine 12 is stopped, lubrication of the speed reducer 20, which must be lubricated when the traveling motor 18 is rotating, is required. Definitely done.

Moreover, since the drive source of the hydraulic pump 26 is the engine 12 or the traveling motor 18, a simple structure without a new drive source is achieved.

Further, by switching the drive source of the hydraulic pump 26 by the hydraulic actuator 28 using the hydraulic pump 52 for engine lubrication as the hydraulic source, the engine 12 can be driven reliably by the drive source of the engine 12 when the engine 12 is in operation. In addition, a simple configuration without a new drive source for the hydraulic actuator 28 is achieved.

FIG. 4 shows the configuration of another embodiment according to the present invention. The same components as those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted. This embodiment is characterized in that the two branch transmission mechanisms 14a and 20a provided in the above-mentioned embodiment are integrally provided. The branch transmission mechanism 58 includes therein a first drive gear 46 connected to the engine 12, a second drive gear 50 connected to a traveling motor, and a driven gear 60 further connected to the hydraulic pump 26. It is arranged.
When the engine 12 is stopped, the second pump gear 50 and the driven gear 60 are in mesh with each other because the hydraulic pump shaft 62 is biased rightward in the figure by a spring (not shown). The hydraulic pump 26 is driven by the traveling motor 18 as in the above-described embodiment. While the engine 12 is operating, the hydraulic actuator 28 moves the hydraulic pump shaft 62 leftward against the urging force of the spring to mesh the first drive gear 46 with the driven gear 60, as in the above-described embodiment. . As a result, the hydraulic pump 26 is driven by the engine 12.

According to this embodiment, not only the same effects as those of the above-described embodiments can be obtained, but the number of driven gears can be reduced from two to one by integrating the branch transmission mechanism. it can.

FIG. 5 shows still another embodiment according to the present invention. The same code | symbol is attached | subjected about the component similar to the above-mentioned Example. Further, the piping from the hydraulic pump 26 and the return piping from the speed increaser and the speed reducer are omitted. Further, the main bodies of the speed increaser and the speed reducer are omitted, and only the branch transmission mechanisms 114a and 120a are shown. The hydraulic pump 26 has a hydraulic pump shaft 138 that transmits power from a drive source to the hydraulic pump and rotates the hydraulic pump. The hydraulic pump 26 can be configured by a trochoid pump, a gear pump, or the like, as in the above-described embodiment. The hydraulic pump shaft 138 is arranged so as to penetrate the hydraulic pump 26, and two driven gears 140 and 142 are integrally provided with the hydraulic pump shaft 138 at both ends thereof. The first driven gear 140 is
The speed increaser branch transmission mechanism 114a is provided in the engine 1
It constantly meshes with a first drive gear 146 provided on a first hydraulic pump drive shaft 144 that is driven by 2. In addition, the second driven gear 142 is the reduction gear branch transmission mechanism 120a.
It is constantly meshed with a second drive gear 150 provided inside a second hydraulic pump drive shaft 148 driven by the traveling motor 18.

A feature of this embodiment is that the two pairs of driving gears and driven gears are always meshed with each other as described above, and that the two hydraulic pump drive shafts 144 and 148 each have a one-way clutch 170, 172 is provided. The one-way clutches 170 and 172 only transmit rotation in one direction, and the driving force is not transmitted when driven from the driven side. That is, when considering the transmission of the driving force from the engine 12 to the hydraulic pump 26, the one-way clutch 170 transmits the driving force in the engine rotation direction to the hydraulic pump 26 direction. If you do, it will slip. Therefore, the engine 1 on the hydraulic pump shaft 138
The hydraulic pump 26 is driven by the higher of the rotation speed of 2 and the rotation speed of the traveling motor 18. A more detailed description is as follows. The driving force from the engine 12 is changed in speed by the first gear pair 146, 140 and transmitted to the hydraulic pump shaft 138, and the driving force of the traveling motor is also changed in speed by the second gear pair 150, 142 and is changed in the hydraulic pump shaft 13.
8 is transmitted. The gear ratios of these gear pairs are respectively r ₁ ,
Let r ₂ be the engine speed N _E and the traveling motor speed N _M , the rotational speed transmitted to the hydraulic pump shaft 138 is (r ₁ × N _E ) from the engine side. From the side, the pressure becomes (r ₂ × N _M ), and the hydraulic pump 26 is driven by the higher converted speed.

Driving by a driving source having a high converted rotational speed has the following effects. When the hydraulic pump 26 is always driven by the engine 12 when the engine is running, it is necessary to secure a large amount of lubricating oil supply in advance, assuming that the number of revolutions of the traveling motor becomes high during high-speed traveling. There is. However, the amount of lubrication is not necessary during normal city driving and is wasted. Therefore, as in the present embodiment, the hydraulic pump 26 is set according to the higher conversion speed of the engine 12 and the traveling motor 18.
The required amount of lubricating oil can be secured by driving the. The drive source of the hydraulic pump 26 is the engine 12
The rotational speed at which the traveling motor 18 is replaced with the traveling motor 18 can be easily set by selecting the gear ratios of the two gear pairs. In the region driven by the traveling motor 18, the rotation of the traveling motor 18 and the speed reducer 20 as well as the rotation of the hydraulic pump increase, so that a large amount of lubricating oil can be supplied during high rotation.

As described above, according to the present embodiment, since the hydraulic pump 26 is driven by the one having the higher converted rotation speed of the engine 12 and the traveling motor 18, the supply of the lubricating oil is not interrupted. Moreover, since the drive is performed at the higher conversion speed, the lubricating oil is sufficiently supplied.

FIG. 6 shows an embodiment in which a power steering device 200 is provided in a hybrid electric vehicle. In this embodiment, the hydraulic pump 2 which supplies lubricating oil to the speed increasing gear 14 and the speed reducer 20 in the above-described embodiment.
6, the hydraulic oil for the power steering device is also supplied. That is, the lubricating oil of the speed increasing gear 14 and the speed reducing gear 20 and the hydraulic oil of the power steering device 200 are shared. As described above, the hydraulic pump 26 is always rotated when either the engine 12 or the traveling motor 18 is rotating, so that the steering operation can be assisted.

However, in the range extender as described above, the engine 12 is stopped when the battery is sufficiently charged. Then, in this state, when the vehicle is traveling at an extremely low speed or is stopped, the rotation of the traveling motor 18 is also stopped at an extremely low speed. Therefore, the hydraulic pressure of the hydraulic oil supplied to the steering device may not be sufficiently increased.

In this embodiment, the power steering device 200 includes a device for supplying high-pressure hydraulic oil when the pressure increase of the hydraulic pump is not sufficient to assist the steering operation as described above. Has been. A block diagram of the configuration of this power steering device 200 is shown in FIG.
Is shown in.

The hydraulic pump 26 is rotated by either the engine 12 or the motor 18, like the hydraulic pumps of the above-described embodiments. When the steering operation is not performed, the oil discharged by the hydraulic pump 26 is supplied to each of the transmissions 14 and 20 as lubricating oil via the pipe 202 and the restriction valve 204. This oil is also supplied to the control valve 210 as hydraulic oil for the power steering device via the pipe 206 and the selection valve 208 described later. However, when the steering operation is not performed, it is not sent to the power cylinder 212, but is collected by the hydraulic pump 26 by a return pipe (not shown).

On the other hand, if the steering operation is performed while the hydraulic pump has a sufficient discharge amount, the control valve 210 controls the supply of hydraulic oil to the power cylinder 212 so as to assist this operation. At this time, the hydraulic pressure in the pipes 202 and 206 increases. Restriction valve 20
No. 4 limits the amount of lubricating oil supplied to the transmission or stops it when the pressure in the pipe 202 exceeds a predetermined value. As a result, the pressure on the discharge side of the hydraulic pump is further increased, the check valve 216 provided in the pipe 214 is opened, and the working oil is supplied to the accumulator tank 218. As a result, high-pressure hydraulic oil is stored in the pressure storage tank 218.

As described above, when the hydraulic pump can sufficiently discharge the hydraulic oil, that is, whether the engine 12 is rotating,
Alternatively, the motor 18 is rotating at a sufficient rotation speed even if the engine 12 is not rotating. Under such a condition, the high pressure hydraulic oil is stored.

On the other hand, when the vehicle is stopped or running at an extremely low speed, even if there is no discharge amount of the hydraulic pump 26 or it is not sufficient, the hydraulic oil from the hydraulic pump 26 cannot assist the steering operation. When the steering operation is performed, the hydraulic oil discharged from the compression side of the power cylinder 212 is supplied to the selection valve 2 via the pipe 220.
It is led to 08. Then, by this pressure, the selection valve 208 makes a selection to guide to the control valve 210 the hydraulic pressure guided by the hydraulic pump 26 via the pipe 206 and the hydraulic pressure higher than the hydraulic pressure guided by the pipe 22 from the accumulator 218. When the vehicle is stopped or at an extremely low speed, the discharge pressure of the hydraulic pump 26 is almost 0. Therefore, high-pressure hydraulic oil is guided from the pressure accumulation tank 218 to the control valve 210 to assist the steering operation. Then, when the steering wheel is operated again to the neutral position, the hydraulic oil in the selection valve 208 causes the orifice 224 to flow.
And the supply of hydraulic oil from the pressure accumulation tank 218 is stopped.

In this way, the steering operation can be assisted by the high-pressure hydraulic oil stored in the accumulator tank 218 even when neither the engine 12 nor the motor 18 peculiar to the range extender is rotating.

Finally, FIG. 8 shows the relationship between the running conditions of the vehicle and the hydraulic power source of the power steering device and the drive source of the hydraulic pump. As the traveling conditions of the range extender, hybrid traveling (HV traveling) in which the engine is rotated to generate electric power while traveling by the motor, electric vehicle traveling (EV traveling) in which the engine is stopped and traveling by the motor, and both the engine and the motor are stopped. It is possible that it is stopped. Further, as described above, the case where the vehicle is traveling at the normal speed during the EV traveling and the case where the vehicle is traveling at an extremely low speed or stopped such as when the vehicle is parked are included.

During HV running, the engine is always rotating, so the hydraulic pump is driven by the engine. However, according to the apparatus of the embodiment shown in FIG. 5, the hydraulic pump is driven by the one having a higher converted rotation speed between the engine and the motor. In any case, the hydraulic pump can sufficiently supply the hydraulic oil during the HV traveling, and can sufficiently fulfill its role as the hydraulic power source of the power steering device.

During EV traveling, the only drive source of the hydraulic pump is the motor, but the number of rotations of the motor corresponds to the vehicle speed on a one-to-one basis, so when the vehicle is stopped such as waiting for a signal, At extremely low speeds such as when entering a garage, the motor speed is stopped or extremely low. Therefore, in such a case, the motor does not serve as a drive source of the hydraulic pump. At this time, the high-pressure hydraulic oil stored in the pressure storage tank serves as a hydraulic pressure source. Therefore, even when you have to perform a large steering operation at low speed, such as when entering the garage,
The operation is assisted.

Further, according to this device, even when the engine and the motor are both stopped and controlled, specifically, even when the ignition switch is turned off, as long as the high pressure hydraulic oil is stored in the pressure accumulating tank, the steering operation is performed. Operational assistance is possible.

As described above, according to this embodiment, the steering operation is always assisted in the hybrid electric vehicle, particularly in the range extender.

[0050]

As described above, according to the present invention, the number of the lubricating hydraulic pumps can be reduced by providing the single hydraulic pump that lubricates both the traveling transmission and the power generating transmission. Furthermore, by selectively driving this hydraulic pump with an engine or a motor, a simple structure can be realized without providing a new drive source.

Furthermore, by utilizing the oil pressure of the lubricating oil of the engine to select the drive source of the hydraulic pump, it is easy to select the drive source as the engine when the engine is running and the motor as the drive source when the engine is stopped. It can be realized by a mechanism.

Further, by providing a one-way clutch on each of the hydraulic pump drive shaft from the engine and the hydraulic pump drive shaft from the motor, the hydraulic pump is driven by the drive source having a higher converted rotation speed on the hydraulic pump shaft. Can be driven. That is, when the engine is stopped, the motor drives the hydraulic pump.When the engine is operating, the engine drives the hydraulic pump when the vehicle is at a very low speed or when the vehicle is stopped or running at low speed. To be done.

Further, by using the above-mentioned hydraulic pump for lubricating the transmission as a hydraulic source of the power steering device,
It is not necessary to provide a hydraulic pump dedicated to the power steering device, and the number of parts and weight can be reduced.

By storing high-pressure hydraulic oil in the accumulator tank when the hydraulic pump discharges a sufficient amount of hydraulic oil, the engine is stopped and the vehicle is stopped or the vehicle runs at a very low speed. The steering operation can be assisted by using the accumulated high-pressure hydraulic oil even when the steering wheel is in use.

[Brief description of drawings]

FIG. 1 is a schematic view showing a state in which a device according to a preferred embodiment of the present invention is mounted on a vehicle.

FIG. 2 is a configuration diagram of the present embodiment and is an operation explanatory diagram, and particularly shows a state when the engine is stopped.

FIG. 3 is a configuration diagram of the present embodiment and an operation explanatory diagram, and particularly shows a state during engine operation.

FIG. 4 is a diagram showing a configuration of an apparatus according to another embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of an apparatus according to still another embodiment of the present invention.

FIG. 6 is a schematic view showing a state in which another embodiment of the present invention is mounted on a vehicle, and particularly shows an apparatus of an embodiment provided with a power steering device.

FIG. 7 is a configuration block diagram illustrating a power steering device.

FIG. 8 is a diagram illustrating a relationship between a driving condition of an electric vehicle and a hydraulic power source of a power steering device and a drive source of a hydraulic pump.

[Explanation of symbols]

 12 engine 14 speed increaser 14a, 114a speed increaser branch transmission mechanism 16 generator 18 traveling motor 20 speed reducer 20a, 120a speed reducer branch transmission mechanism 26 hydraulic pump 28 hydraulic actuator 38, 138 hydraulic pump shaft 40, 140 1st Driven gear 42, 142 Second driven gear 46, 146 First drive gear 50, 150 Second drive gear 170, 172 One-way clutch 200 Power steering device 208 Selection valve 210 Control valve 212 Power cylinder 218 Accumulation tank

Claims (5)

[Claims] 1. A hybrid electric vehicle in which an engine, a generator driven by the engine, and a running battery are mounted, and a motor is driven by a motor driven by the electric power generated by the generator and the electric power stored in the battery. A traveling transmission that shifts the rotation of the motor and transmits it to driving wheels; a power transmission that shifts the rotation of the engine and transmits it to the generator; the traveling transmission and the power transmission A hybrid electric vehicle, comprising: a single hydraulic pump that supplies lubricating oil to the engine; and a drive source selection mechanism that selects a drive source of the hydraulic pump to one of the engine and the motor. 2. The hybrid electric vehicle according to claim 1, wherein the drive source selection mechanism includes a first hydraulic pump drive shaft driven by the engine, and a first hydraulic pump drive shaft provided on the first hydraulic pump drive shaft. A drive gear, a second hydraulic pump drive shaft driven by the motor, a second drive gear provided on the second hydraulic pump drive shaft, and selectively meshing with one of the first and second drive gears A hydraulic pump shaft integrally provided with a driven gear and an oil pressure of the lubricating oil of the engine to operate, the driven gear of the hydraulic pump shaft meshes with a first driving gear when the engine is operating, and the engine is stopped when the engine is stopped. A hybrid electric vehicle comprising: a hydraulic actuator that meshes a driven gear with a second driving gear. 3. The hybrid electric vehicle according to claim 1, wherein the drive source selection mechanism includes a first hydraulic pump drive shaft driven by the engine, and a first hydraulic pump drive shaft provided on the first hydraulic pump drive shaft. A one-way clutch, a first drive gear provided on the first hydraulic pump drive shaft and driven via the first one-way clutch, a second hydraulic pump drive shaft driven by the motor, and a second hydraulic pressure A second one-way clutch provided on the pump drive shaft, a second drive gear provided on the second hydraulic pump drive shaft and driven via the second one-way clutch, and a first one of the first and second drive gears. A hydraulic pump shaft integrally provided with a driven gear that constantly meshes with the both, and the hydraulic pump is driven by a drive source with a high rotation speed on the hydraulic pump shaft. A hybrid electric vehicle characterized by the following features. 4. The hybrid electric vehicle according to claim 1, further comprising a power steering device that uses lubricating oil discharged from the hydraulic pump as hydraulic oil. . 5. The hybrid electric vehicle according to claim 4, wherein the power steering device includes a limiting valve that limits an amount of lubricating oil supplied to the two transmissions during steering operation, and a control valve from the hydraulic pump. It includes a pressure accumulator circuit provided in parallel with the hydraulic circuit up to which the pressure accumulator circuit stores a high pressure hydraulic oil generated by a hydraulic pump, and a high pressure hydraulic oil when the hydraulic pump discharge pressure is equal to or higher than a predetermined value. A hybrid electric vehicle, comprising: a check valve that guides to the accumulator tank; and a selection valve that guides the hydraulic pump and hydraulic oil having a higher pressure in the accumulator tank to the control valve.