JP2004183807A - Power train for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power train which realizes the normal operation even in a state where the hydraulic oil is not supplied to an input clutch. <P>SOLUTION: This power train includes an input clutch mounted between an engine and an automatic transmission 300 for disconnecting the engine and the automatic transmission 300, an oil pump 700 mounted between the input clutch and the automatic transmission 300 for supplying the hydraulic oil to the input clutch, and a one-way clutch mounted between the engine and the oil pump 700 for transmitting the driving force of the engine to drive the oil pump 700 by the engine in a case that the input clutch does not transmit the driving force of the engine. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD 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 is driven by an engine connectable by the input clutch and an oil pump that secures the operating oil pressure of the input clutch.
[0002]
[Prior art]
2. Description of the Related Art Many hydraulic devices including an automatic transmission are mounted on a vehicle. The working oil 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 a motor generator for assisting an engine is mounted on such a vehicle. Japanese Patent Laying-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, a drive control device for an oil pump disclosed in Patent Literature 1 includes an automatic pump 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 the transmission 300, an electronic control unit (drive control unit for a vehicle oil pump) for controlling the operation of the hydraulic pump 700 is used when the hydraulic pressure of the automatic transmission 300 decreases after the engine stops. Includes an oil pump drive control circuit for driving oil pump 700 by motor generator 500.
[0004]
According to the drive control device of the oil pump disclosed in Patent Document 1, the oil pressure is reliably maintained during the stop of the vehicle in which the engine is stopped without using the electric oil pump, so that the shock at the time of restart Is suppressed, and the inconvenience such as a decrease in mountability is eliminated by providing an electric oil pump outside the automatic transmission 300.
[0005]
[Patent Document 1]
JP-A-2002-130143
[Problems to be solved by the invention]
However, in a vehicle generally not equipped with an electric oil pump, such as a vehicle including a drive control device for an oil pump disclosed in Patent Document 1, in a normal state, the input clutch 208 must be engaged. 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-mentioned problem, and is a power train having a hydraulic input clutch provided between an engine and an oil pump, wherein hydraulic oil is supplied to the input clutch. An object of the present invention is to provide a power train of a vehicle that can realize a 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, is provided with an input clutch capable of disconnecting the drive source and the transmission, and operates by a drive force of the drive source to supply hydraulic oil to the input clutch. The drive of the drive source is provided between the supply oil pump and the drive source and the transmission so that the oil pump is operated by the drive source when the input clutch is not transmitting the drive force of the drive source. Transmission means for transmitting force.
[0009]
According to the first aspect, even when the hydraulic fluid 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 transmission means. Therefore, the oil pump is driven by the drive source, and thereafter, the driving force is transmitted by the input clutch. As a result, a power train having a hydraulic input clutch provided between the drive source and the oil pump can realize a reliable operation 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 a driving force toward the transmission from the driving source.
[0011]
According to the second aspect, the one-way clutch can transmit the drive of the engine to the oil pump without the intervention of the input clutch when the engine rotates (provided that the rotation is faster than the rotation of the drive wheels).
[0012]
The power train according to a third aspect of the present invention is provided between the drive source and the transmission, and is provided with an input clutch capable of separating the drive source and the transmission, and is operated by the driving force of the drive source to supply hydraulic oil to the input clutch. Supply oil pump. The input clutch includes a transmission unit for transmitting the driving force of the driving source to the oil pump so that the oil pump is driven by the driving source when the operating 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 such that the oil pump is driven by the drive source even when the hydraulic oil is not supplied from the oil pump. You. Therefore, the oil pump is driven by the drive source. As a result, a power train having a hydraulic input clutch provided between the drive source and the oil pump can realize a reliable operation even when hydraulic oil is not supplied to the input clutch. .
[0014]
In the power train according to the fourth aspect, in addition to the configuration of the third aspect, the transmission means includes a friction material that transmits the driving force of the driving source by engaging, and a piston that engages the friction material. Means for applying an urging force to the piston, and means for applying a force opposing the urging force to the piston by hydraulic oil supplied from an oil pump.
[0015]
According to the fourth aspect of the present invention, in the transmission means, a biasing means, for example, a biasing force is applied to the piston by a force of a spring, and a force opposing the biasing force is applied to the piston by hydraulic oil supplied from an oil pump. Is done. For this reason, when hydraulic oil is supplied from the oil pump, the friction material does not engage, and when hydraulic oil is not supplied from the oil pump, the friction material engages and the driving source of the driving force is changed to oil. Transmit to pump. For this reason, the driving force of the driving source can be transmitted to the oil pump using the urging force even when the hydraulic oil is not supplied.
[0016]
A power train according to a fifth aspect of the present invention further includes a fluid coupling connected to a 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 aspect, the power train further includes a fluid coupling such as a torque converter or a fluid coupling, and can transmit the driving force of the driving source to the oil pump even when the hydraulic oil is stopped.
[0018]
The power train according to a sixth aspect of the present 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 aspects.
[0019]
According to the sixth aspect, the power train further includes the motor generator, and can transmit the driving force of the driving source to the oil pump even when the operation oil is stopped. Further, the oil pump can be driven by operating the motor generator as a motor.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same components are denoted by the same reference numerals. Their names and functions are 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 will be described as a torque converter having a torque amplification function, and the transmission will be described as an automatic transmission. However, the present invention is not limited to this. For example, the transmission may be a CVT (Continuously Variable Transmission).
[0022]
Further, the power train according to the present embodiment is equipped with an engine and a motor generator for torque assisting the engine. ECT_ECU (Electronic Controlled Automatic Transmission_Electronic Control Unit) torque assists the engine with the motor generator according to the torque amplifying action of the torque converter.
[0023]
The 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 is composed of An output shaft of the engine 100 is connected to an input shaft of the torque converter 200 via an engine inertia 110 schematically represented. Engine 100 and torque converter 200 are connected by rotating shaft 150. Therefore, the output shaft speed N (E) of the engine 100 and the input shaft speed N (P) of the torque converter 200 are the same. Further, the output torque of engine 100 is expressed as T (E), and the input torque to torque converter 200 is expressed 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 obtain a desired acceleration when the vehicle starts, and assists the engine 100. Also, during regenerative braking, it operates as a generator to convert kinetic energy to electrical energy and collect it.
[0025]
The torque converter 200 includes a lock-up clutch 210 and includes a pump impeller 220 and a turbine impeller 230. The torque converter 200 and the automatic transmission 300 are connected by a rotating shaft 250. The output shaft speed of the torque converter 200 is represented by N (T), and the output torque of the torque converter 200 is represented by T (T).
[0026]
The ECT_ECU 400 that controls these power trains receives a pump speed N (P), a turbine speed N (T), an accelerator opening, a vehicle speed, a vehicle acceleration, a throttle opening, an AT signal, and a shift position signal. . Further, a lock-up clutch engagement pressure signal is output from ECT_ECU 400 to lock-up clutch 210 of torque converter 200. AT control signal is output from ECT_ECU 400 to automatic transmission 300. ECT_ECU 400 outputs an assist amount instruction signal to inverter 600.
[0027]
In FIG. 1, the power of engine 100 or the power of engine 100 and motor generator 500 is transmitted to a driving source connected via automatic transmission 300 having torque converter 200 with a lock-up clutch. The torque converter 200 includes a pump impeller 220 fixed to a crankshaft (input shaft of the torque converter 200) 150 of the engine 100 and a turbine connected to an input shaft (output shaft of the torque converter 200) 250 of the automatic transmission 300. An impeller 230, a lock-up 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 provides torque acceleration of engine 100 using motor generator 500 in order to impart desired acceleration performance (acceleration responsiveness and feeling of elongation) to the vehicle, and to improve fuel efficiency. Then, the engine 100 is stopped and the vehicle runs only with 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, the clutch elements (C (0) to C (2) in the figure), which are friction elements, and the brake elements (B (0) to B (4)). ), The gear positions in which the one-way clutch elements (F (0) to F (2)) are engaged and disengaged. At the first speed used when the vehicle starts, the clutch element (C (0), C (1)), the brake element (B (4)), and the one-way clutch element (F (0), F (2)) are engaged. Combine.
[0030]
As shown in FIG. 2, this power train includes a one-way clutch 206 and an input clutch 208 provided in parallel with the one-way clutch 206 between the engine 100 and the torque converter 200. Motor generator 500 and oil pump 600 are provided on the input shaft of torque converter 200. By doing so, the input clutch 108 and the lock-up clutch 210 can be disposed close to each other in distance, so that the oil passage arrangement and the arrangement of the oil passage are facilitated, and the sealability of the working oil is easily ensured.
[0031]
When engine 100 rotates, one-way clutch 206 can transmit the driving force to the input shaft of torque converter 200 without passing through 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 that the oil pump 700 is driven by the output of the engine 100. Due to the characteristics of the one-way clutch 206, when the rotation speed on the engine 100 side becomes lower than that on the drive wheel side, the driving force from the engine 100 is not automatically transmitted, and the condition that the input clutch 208 is released. As a result, the engine 100 is disconnected from the driving wheel side device by the one-way clutch 206 and the input clutch 208.
[0032]
When hydraulic oil is not supplied to input clutch 208 (for example, oil pump 700 is not driven by engine 100 and motor generator 500, oil pump 700 has failed, or the control circuit of 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. Thus, the driving force is transmitted to oil pump 700. Further, when motor generator 500 operates as a motor and engine 100 is stopped, input clutch 208 is released, and motor generator 500 drives oil pump 700. 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 driven by engine 100 and motor generator 500. Is driven. In this case, engine 100 is being assisted by motor generator 500.
[0033]
At the time of energy regeneration, the one-way clutch 206 does not transmit the driving force from the drive wheels due to its characteristics, and the input clutch 208 is released. Lock-up clutch 210 is engaged (or may be slipped), and the driving force of the drive wheels is efficiently transmitted to motor generator 500, and motor generator 500 functions as a generator. At this time, the oil pump 700 is rotated by the driving force from the driving wheels to generate a working oil pressure.
[0034]
Oil pressure may be supplied from oil pump 700 to frictionally engaging elements such as clutches and brakes in automatic transmission 300 that are actuated by oil pressure.
[0035]
Further, at the time of a stop or when a sudden rise in hydraulic pressure is required upon starting, 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. Is also good.
[0036]
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 the operating oil is not supplied to the input clutch, the engine is controlled by the one-way clutch. Is transmitted to the oil pump, so that a predetermined operating pressure can be generated by the oil pump. As a result, a power train having a hydraulic input clutch provided between the engine and the oil pump can realize a reliable operation even when hydraulic oil is not supplied to the input clutch.
[0037]
<First Embodiment Modification>
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 in the position of the one-way clutch 206 and the position of the input clutch 208 provided alongside the one-way clutch 206. As shown in FIG. 4, in the power train according to the present modification, the one-way clutch 206 and the input clutch 208 are arranged behind the torque converter 200.
[0038]
By arranging in this manner, it is easy to manage the oil passage due to 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 components as those of the power train according to the first embodiment are denoted by the same reference numerals. 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. The input clutch 218 can reduce the driving force of the engine 100 even when a sufficient amount of hydraulic oil is not supplied from the oil pump 700 due to a failure of the oil pump 700, a failure of a control circuit of the oil pump 700, or a defect of an oil passage. The torque 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 member 2180 for transmitting power by friction, a piston 2182 for pressing the friction member 2180, and an oil seal 2184 for supporting the piston 2182 slidably in the left-right direction. , A working portion 2188 to which the working oil is supplied, and a spring 2186 that applies a force to the piston 2182 to push the friction material 2180 when the working oil is not supplied to the working portion 2188.
[0042]
When the operating oil is supplied to the operating portion 2188, a force opposing the elastic force of the spring 2186 is applied to the piston 2182, the friction material 2180 is separated, and the clutch is released. Conversely, if the operating oil is not supplied to the operating portion 2188 or the operating oil pressure is insufficient, the force due to the elastic force of the spring 2186 is applied to the piston 2182, the friction material 2180 is engaged, and the clutch is engaged. Is done. Whether 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 input clutch 218 (for example, oil pump 700 is not driven by engine 100 and motor generator 500, oil pump 700 has failed, or the control circuit of 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. Thus, the driving force is transmitted to oil pump 700. As a result, the operating oil pressure is ensured by the oil pump 700, and the oil pressure for releasing the input clutch 218 is supplied or the supply of the oil pressure for engaging the input clutch 218 is stopped by the control of the hydraulic circuit. .
[0044]
Further, when motor generator 500 operates as a motor and engine 100 is stopped, input clutch 218 is released and motor generator 500 drives oil pump 700. 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 being assisted by motor generator 500.
[0045]
At the time of energy regeneration, the input clutch 218 is released. The lock-up clutch 210 is engaged (or may be slipped), the driving force of the drive 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 wheels to generate a working oil 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 the operating oil is not supplied to the input clutch, Since the driving force of the engine is transmitted to the oil pump by the elastic force of the spring, a predetermined operating pressure can be generated by the oil pump. As a result, a power train having a hydraulic input clutch provided between the engine and the oil pump can reliably operate even when hydraulic oil is not supplied to the input clutch.
[0047]
<Second Embodiment Modification>
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 differs 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 the present modification, the input clutch 218 is disposed behind the torque converter 200.
[0048]
With such an arrangement, the oil path can be easily arranged due to the characteristics and shape of the torque converter 200.
[0049]
The embodiments disclosed this time are to be considered in all respects as illustrative 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 modified example of the first embodiment of the present invention.
FIG. 5 is a diagram illustrating a configuration of a power train according to a second embodiment of the present invention.
FIG. 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 modified example 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 (6)

An input clutch that is provided between a drive source and a transmission and that can disconnect the drive source and the transmission;
An oil pump that operates by the driving force of the drive source and supplies hydraulic oil to the input clutch;
The drive source is provided between the drive source and the transmission so that the oil pump is operated by the drive source when the input clutch is not transmitting the drive force of the drive source. Transmission means for transmitting the driving force. The vehicle power train according to claim 1, wherein the transmission unit is a one-way clutch that only allows transmission of the driving force toward the transmission from the driving source. An input clutch that is provided between a drive source and a transmission and that can disconnect the drive source and the transmission;
An oil pump that operates by the driving force of the drive source and supplies hydraulic oil to the input clutch,
The input clutch includes a transmission unit for transmitting a driving force of the driving source to the oil pump so that the oil pump is operated by the driving source when hydraulic oil is not supplied from the oil pump. , Vehicle powertrain. The transmission means,
A friction material that transmits a driving force of the driving source by being engaged;
A piston for engaging the friction material,
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 power train according to claim 3, wherein the transmission unit further includes a unit configured to apply a force against the urging force to the piston by hydraulic oil supplied from the oil pump. The power train further includes a fluid coupling connected to the transmission,
The power train of a vehicle according to any one of claims 1 to 4, wherein the oil pump is connected to an input side of the fluid coupling. The power train of a vehicle according to any one of claims 1 to 5, wherein the power train further includes a motor generator connected to an input side of the oil pump.

Images