JP4513257B2 - Vehicle power train - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power train of a vehicle, and more particularly, to a power train that includes a hydraulic input clutch and that is driven by an engine that can be connected by the input clutch.
[0002]
[Prior art]
Many hydraulic devices including an automatic transmission are mounted on a vehicle. The hydraulic pressure of these hydraulic devices is secured by an oil pump. This oil pump is operated using a part of the driving force of the engine. There is also a hybrid system in which such a vehicle is equipped with a motor generator that assists the engine. Japanese Patent Laid-Open No. 2002-130143 (Patent Document 1) discloses an oil pump drive control device in such a hybrid system.
[0003]
As shown in FIG. 8, the drive control device for an oil pump disclosed in Patent Document 1 is an automatic having an oil pump 700 that is rotated together with an input shaft selectively driven by an engine and a motor generator 500 as a hydraulic source. In a vehicle equipped with a transmission 300, an electronic control device (drive control device for a vehicle oil pump) for controlling the operation of the hydraulic pump 700 reduces the hydraulic pressure of the automatic transmission 300 after the engine is stopped. Includes an oil pump drive control circuit that drives oil pump 700 by motor generator 500.
[0004]
According to the oil pump drive control device disclosed in Patent Document 1, since the hydraulic pressure is reliably maintained while the vehicle is stopped so that the engine is stopped without using an electric oil pump, the shock at the time of re-starting Is suppressed, and the inconvenience such as a decrease in mountability due to the provision of the electric oil pump outside the automatic transmission 300 is solved.
[0005]
[Patent Document 1]
JP-A-2002-130143 gazette
[Problems to be solved by the invention]
However, in vehicles including an oil pump drive control device disclosed in Patent Document 1 and generally not equipped with an electric oil pump, the input clutch 208 must be engaged in a normal state. Since the driving force of the engine is not transmitted to the oil pump 700, the oil pump 700 does not operate. On the other hand, if the oil pump 700 does not operate, the hydraulic pressure for operating the input clutch 208 cannot be secured.
[0007]
The present invention has been made to solve the above-described problems, and is a power train having a hydraulic input clutch provided between an engine and an oil pump, and hydraulic oil is supplied to the input clutch. It is an object of the present invention to provide a vehicle power train that can realize reliable operation even when it is not performed.
[0008]
[Means for Solving the Problems]
A power train according to a first aspect of the present invention is provided between a drive source and a transmission, and operates with an input clutch capable of separating the drive source and the transmission, and a driving force of the drive source, and supplies hydraulic oil to the input clutch. Drive oil source is provided between the oil pump to be supplied and the drive source and the transmission so that the oil pump is operated by the drive source when the input clutch does not transmit the drive force of the drive source. Transmission means for transmitting force.
[0009]
According to the first aspect, even when hydraulic oil is not supplied from the oil pump to the input clutch and the input clutch does not transmit the driving force of the driving source, the driving force of the driving source is transmitted to the oil pump by the transmitting means. Therefore, the oil pump is driven by the driving source, and thereafter, the driving force is transmitted by the input clutch. As a result, it is a power train having a hydraulic input clutch provided between the drive source and the oil pump, and a reliable operation can be realized even when hydraulic oil is not supplied to the input clutch. .
[0010]
In the power train according to the second invention, in addition to the configuration of the first invention, the transmission means is a one-way clutch that only allows transmission of the driving force directed to the transmission from the driving source.
[0011]
According to the second invention, the one-way clutch can transmit the drive of the engine to the oil pump without the input clutch if the engine rotates (provided that the rotation is faster than the rotation on the drive wheel side).
[0012]
A power train according to a third aspect of the present invention is provided between the drive source and the transmission, operates with an input clutch capable of separating the drive source and the transmission, and a driving force of the drive source, and supplies hydraulic oil to the input clutch. Including an oil pump to be supplied. The input clutch includes a transmission means for transmitting the driving force of the drive source to the oil pump so that the oil pump is driven by the drive source when hydraulic oil is not supplied from the oil pump.
[0013]
According to the third invention, the driving force of the drive source is transmitted by the transmission means included in the input clutch so that the oil pump is driven by the drive source even when hydraulic oil is not supplied from the oil pump. The Therefore, the oil pump is driven by the drive source. As a result, it is a power train having a hydraulic input clutch provided between the drive source and the oil pump, and a reliable operation can be realized even when hydraulic oil is not supplied to the input clutch. .
[0014]
In the power train according to the fourth aspect of the invention, in addition to the configuration of the third aspect of the invention, the transmission means includes a friction material that transmits the driving force of the drive source by being engaged, and a piston that engages the friction material. The application means for applying an urging force to the piston, and the means for applying a force against the urging force to the piston by the hydraulic oil supplied from the oil pump.
[0015]
According to the fourth invention, in the transmission means, the urging force is applied to the piston by the force of the urging means, for example, the spring, and the force opposite to the urging force is applied to the piston by the hydraulic oil supplied from the oil pump. Is done. For this reason, when the hydraulic oil is supplied from the oil pump, the friction material is not engaged. When the hydraulic oil is not supplied from the oil pump, the friction material is engaged and the drive source of the driving force is oil. Transmit to the pump. For this reason, even if hydraulic oil is not supplied, the driving force of a drive source can be transmitted to an oil pump using a biasing force.
[0016]
The power train according to the fifth aspect of the invention further includes a fluid coupling connected to the transmission in addition to the configuration of any one of the first to fourth aspects of the invention. The oil pump is connected to the input side of the fluid coupling.
[0017]
According to the fifth invention, the power train further includes a fluid coupling such as a torque converter or a fluid coupling, and the driving force of the driving source can be transmitted to the oil pump even when the hydraulic oil is stopped.
[0018]
The power train according to the sixth invention further includes a motor generator connected to the input side of the oil pump in addition to the configuration of any one of the first to fifth inventions.
[0019]
According to the sixth invention, the power train further includes the motor generator, and the driving force of the driving source can be transmitted to the oil pump even when the hydraulic oil is stopped. Furthermore, the oil pump can be driven by operating the motor generator as a motor.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.
[0021]
<First Embodiment>
A power train according to the first embodiment of the present invention will be described. In the following description, the fluid coupling is described as a torque converter having a torque amplification function, and the transmission is described as an automatic transmission. However, the present invention is not limited to this. For example, the transmission may be a continuously variable transmission (CVT).
[0022]
In addition, the power train according to the present embodiment is equipped with an engine and a motor generator that assists torque in the engine. An ECT_ECU (Electronic Controlled Automatic Transmission_Electronic Control Unit) assists the engine with a motor generator according to the torque amplification action of the torque converter.
[0023]
A power train according to the present embodiment will be described with reference to FIG. As shown in FIG. 1, the power train includes an engine 100, a torque converter 200, an automatic transmission 300, a motor generator 500 that assists the engine 100, an inverter 600 that controls the motor generator 500, and an oil pump 700. It consists of. The output shaft of the engine 100 is connected to the input shaft of the torque converter 200 via the engine inertia 110 schematically represented. Engine 100 and torque converter 200 are connected by rotating shaft 150. Therefore, output shaft speed N (E) of engine 100 and input shaft speed N (P) of torque converter 200 are the same. Further, the output torque of engine 100 is represented as T (E), and the input torque to torque converter 200 is represented as T (P).
[0024]
Motor generator 500 is configured to transmit torque to rotating shaft 150 connecting engine 100 and torque converter 200. The motor generator 500 operates as a motor to assist the engine 100 in order to obtain a desired acceleration when the vehicle starts. Also, during regenerative braking, it operates as a generator to convert kinetic energy into electrical energy and recover it.
[0025]
The torque converter 200 includes a lock-up clutch 210 and includes a pump impeller 220 and a turbine impeller 230. Torque converter 200 and automatic transmission 300 are connected by rotating shaft 250. The output shaft rotational speed of the torque converter 200 is represented as N (T), and the output torque of the torque converter 200 is represented as T (T).
[0026]
The ECT_ECU 400 that controls these power trains receives the pump speed N (P), turbine speed N (T), accelerator opening, vehicle speed, vehicle acceleration, throttle opening, AT signal, and shift position signal. . Further, a lockup clutch engagement pressure signal is output from the ECT_ECU 400 to the lockup clutch 210 of the torque converter 200. An AT control signal is output from the ECT_ECU 400 to the automatic transmission 300. An assist amount instruction signal is output from the ECT_ECU 400 to the inverter 600.
[0027]
In FIG. 1, the power of engine 100 or engine 100 and motor generator 500 is transmitted to a drive source connected via an automatic transmission 300 including torque converter 200 with a lockup clutch. The torque converter 200 is a turbine connected to a pump impeller 220 fixed to a crankshaft (input shaft of the torque converter 200) 150 of the engine 100 and an input shaft (output shaft of the torque converter 200) 250 of the automatic transmission 300. An impeller 230, a lockup clutch 210 that directly connects the pump impeller 220 and the input shaft 250, and a stator 222 are provided.
[0028]
The power train according to the present embodiment uses the motor generator 500 to torque assist the engine 100 or improve fuel efficiency in order to give the vehicle desired acceleration performance (acceleration responsiveness and stretch feeling). In addition, the engine 100 is stopped and the vehicle is driven only by the motor generator 500.
[0029]
FIG. 2 shows a skeleton diagram of the automatic transmission 300, and FIG. 3 shows an operation table of the automatic transmission 300. According to the skeleton diagram shown in FIG. 2 and the operation table shown in FIG. 3, clutch elements (C (0) to C (2) in the figure) and brake elements (B (0) to B (4)) ), In which gear stage the one-way clutch elements (F (0) to F (2)) are engaged and released. At the 1st speed used when the vehicle starts, the clutch elements (C (0), C (1)), brake elements (B (4)), and one-way clutch elements (F (0), F (2)) are engaged. Match.
[0030]
As shown in FIG. 2, this power train includes a one-way clutch 206 and an input clutch 208 that is provided with the one-way clutch 206 between engine 100 and torque converter 200. A motor generator 500 and an oil pump 700 are provided on the input shaft of the torque converter 200. In this way, the input clutch 108 and the lock-up clutch 210 can be disposed close to each other, so that it is easy to arrange the oil passage and route the oil passage, and to ensure the sealing performance of the hydraulic oil.
[0031]
When the engine 100 rotates, the one-way clutch 206 can transmit the driving force to the input shaft of the torque converter 200 without passing through the input clutch 208. At this time, it can be said that the output of the engine 100 is transmitted to the drive wheels via the automatic transmission 300 or the oil pump 700 is driven by the output of the engine 100. Due to the characteristics of this one-way clutch 206, when the rotational speed on the engine 100 side becomes lower than that on the driving wheel side, the driving force from the engine 100 is not automatically transmitted and the input clutch 208 is released. As a result, the engine 100, the one-way clutch 206 and the input clutch 208 are disconnected from the driving wheel side device.
[0032]
When hydraulic oil is not supplied to the input clutch 208 (for example, the oil pump 700 is not driven by the engine 100 and the motor generator 500, the oil pump 700 has failed, the control circuit of the oil pump 700 has failed) When the engine 100 rotates, the one-way clutch 206 transmits the driving force of the engine 100 to the oil pump 700 and the automatic transmission 300. As a result, the driving force is transmitted to the oil pump 700. Further, when motor generator 500 operates as a motor and engine 100 is stopped, input clutch 208 is released and oil pump 700 is driven by motor generator 500. When motor generator 500 operates as a motor and engine 100 is rotating, input clutch 208 is engaged (and by one-way clutch 206), and oil pump 700 is connected by engine 100 and motor generator 500. Is driven. In this case, engine 100 is assisted by motor generator 500.
[0033]
During energy regeneration, the one-way clutch 206 does not transmit the driving force from the driving wheels due to its characteristics, and the input clutch 208 is released. The lock-up clutch 210 is engaged (or may be slipped), the driving force of the driving wheels is efficiently transmitted to the motor generator 500, and the motor generator 500 functions as a generator. At this time, the oil pump 700 is rotated by the driving force from the driving wheel to generate the hydraulic pressure.
[0034]
Note that the oil pump 700 may also supply hydraulic pressure to friction engagement elements that are operated by hydraulic pressure such as clutches and brakes in the automatic transmission 300.
[0035]
Further, when stopping or when a sudden rise in hydraulic pressure accompanying starting is required, the motor generator 500 operates as a motor, the input clutch 208 is released, and the oil pump 700 is driven by the motor generator 500. Also good.
[0036]
As described above, according to the power train according to the present embodiment, even if the oil pump driven by the driving force of the engine is not driven and hydraulic oil is not supplied to the input clutch, Is transmitted to the oil pump, so that a predetermined operating pressure can be generated by the oil pump. As a result, it is a power train having a hydraulic input clutch provided between the engine and the oil pump, and a reliable operation can be realized even when hydraulic oil is not supplied to the input clutch.
[0037]
<Modification of First Embodiment>
FIG. 4 shows a power train according to a modification of the first embodiment of the present invention. The power train according to this modification is different from the power train shown in FIG. 2 described above in the positions of the one-way clutch 206 and the input clutch 208 provided in the one-way clutch 206. As shown in FIG. 4, in the power train according to this modification, a one-way clutch 206 and an input clutch 208 are arranged behind the torque converter 200.
[0038]
With this arrangement, the oil passage can be easily routed from the characteristics and shape of the torque converter 200.
[0039]
<Second Embodiment>
Hereinafter, a power train according to the second embodiment of the present invention will be described. The power train according to the present embodiment has an input clutch 218 having a structure different from that of the input clutch 208 of the power train according to the first embodiment, and does not have the one-way clutch 206. In the following description, the same reference numerals are assigned to the same components as those of the power train according to the first embodiment described above. Their functions are the same. Therefore, detailed description thereof will not be repeated here.
[0040]
Referring to FIG. 5, the power train according to the present embodiment has input clutch 218 between engine 100 and torque converter 200, and does not have one-way clutch 206. This input clutch 218 provides the driving force of the engine 100 even if sufficient hydraulic oil is not supplied from the oil pump 700 due to a failure of the oil pump 700, a failure of the control circuit of the oil pump 700, or a failure of the oil passage. It can be transmitted to the torque converter 200.
[0041]
FIG. 6 shows a cross-sectional view of the input clutch 218. As shown in FIG. 6, the input clutch 218 includes a friction material 2180 for transmitting power by friction, a piston 2182 for pushing the friction material 2180, and an oil seal 2184 for supporting the piston 2182 slidably in the left-right direction. , A working portion 2188 to which hydraulic oil is supplied, and a spring 2186 that applies a force to push the friction material 2180 to the piston 2182 when the hydraulic fluid is not supplied to the working portion 2188.
[0042]
When the hydraulic oil is supplied to the operating portion 2188, a force against the elastic force of the spring 2186 is applied to the piston 2182, the friction material 2180 is released, and the clutch is released. On the other hand, when hydraulic oil is not supplied to the operating portion 2188 or the hydraulic pressure is insufficient, a force due to the elastic force of the spring 2186 is applied to the piston 2182, and the friction material 2180 is engaged and the clutch is engaged. Is done. Whether or not hydraulic oil is supplied to the input clutch 218 by the oil pump 700 is controlled by a hydraulic circuit (not shown).
[0043]
When hydraulic oil is not supplied to the input clutch 218 (for example, the oil pump 700 is not driven by the engine 100 and the motor generator 500, the oil pump 700 has failed, the control circuit of the oil pump 700 has failed) When the engine 100 rotates, the input clutch 218 transmits the driving force of the engine 100 to the oil pump 700 and the automatic transmission 300. As a result, the driving force is transmitted to the oil pump 700. As a result, the hydraulic pressure is secured by the oil pump 700, and the hydraulic pressure for releasing the input clutch 218 is supplied by the control of the hydraulic circuit, or the supply of hydraulic pressure is stopped to engage the input clutch 218. .
[0044]
Further, when motor generator 500 operates as a motor and engine 100 is stopped, input clutch 218 is released and oil pump 700 is driven by motor generator 500. When motor generator 500 operates as a motor and engine 100 is rotating, input clutch 218 is engaged and oil pump 700 is driven by engine 100 and motor generator 500. In this case, engine 100 is assisted by motor generator 500.
[0045]
During energy regeneration, the input clutch 218 is released. The lock-up clutch 210 is engaged (or may be slipped), the driving force of the driving wheels is efficiently transmitted to the motor generator 500, and the motor generator 500 operates as a generator. At this time, the oil pump 700 is rotated by the driving force from the driving wheel to generate the hydraulic pressure.
[0046]
As described above, according to the power train according to the present embodiment, even when the oil pump driven by the driving force of the engine is not driven and hydraulic oil is not supplied to the input clutch, the power train is built in the input clutch. Since the driving force of the engine is transmitted to the oil pump by the elastic force of the spring, the predetermined operating pressure can be generated by the oil pump. As a result, it is a power train having a hydraulic input clutch provided between the engine and the oil pump, and a reliable operation can be realized even when hydraulic oil is not supplied to the input clutch.
[0047]
<Modification of Second Embodiment>
FIG. 7 shows a power train according to a modification of the second embodiment of the present invention. The power train according to this modification is different from the power train shown in FIG. 5 described above in the position of the input clutch 218. As shown in FIG. 7, in the power train according to this modification, the input clutch 218 is disposed behind the torque converter 200.
[0048]
With such an arrangement, the oil passage can be easily routed from the characteristics and shape of the torque converter 200.
[0049]
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a power train according to an embodiment of the present invention.
FIG. 2 is a diagram showing a configuration of a power train according to the first embodiment of the present invention.
FIG. 3 is a diagram illustrating an operation engagement state of the automatic transmission.
FIG. 4 is a diagram showing a configuration of a power train according to a modification of the first embodiment of the present invention.
FIG. 5 is a diagram showing a configuration of a power train according to a second embodiment of the present invention.
6 is a cross-sectional view of the input clutch of FIG.
FIG. 7 is a diagram showing a configuration of a power train according to a modification of the second embodiment of the present invention.
FIG. 8 is a diagram showing a configuration of a conventional power train.
[Explanation of symbols]
100 engine, 110 engine inertia, 200 torque converter, 206 one-way clutch, 208 input clutch, 210 lock-up clutch, 220 pump impeller, 230 turbine impeller, 300 automatic transmission, 400 ECT_ECU, 500 motor generator, 600 inverter, 700 Oil pump.

Claims (2)

An input clutch provided between the engine and the transmission and capable of separating the engine and the transmission;
An oil pump that is provided between the input clutch and the transmission, operates by the driving force of the engine, and supplies hydraulic oil to the input clutch;
A power train of a vehicle including a motor generator coupled to the transmission downstream of the input clutch in a power transmission path,
The input clutch includes a transmission means for transmitting the driving force of the engine to the oil pump so that the oil pump is operated by the engine when hydraulic oil is not supplied from the oil pump.
At the time of energy regeneration by the motor generator, the input clutch is released,
The transmission means includes
A friction material that transmits the driving force of the engine by engaging;
A piston for engaging the friction material;
An applying means for applying an urging force to the piston,
When the biasing force by the piston is applied, the friction material is engaged,
The transmission means further by the hydraulic fluid supplied from the oil pump, a force against the biasing force, including means for imparting to said piston, vehicles powertrain. The power train further includes a fluid coupling connected to the transmission,
The vehicle power train according to claim 1 , wherein the oil pump is connected to an input side of the fluid coupling.

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