JP2011157987A - Hydraulic control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic control device which is highly excellent in durability and can more efficiently control an oil pump (rotated by using a part of a rotational driving force of an engine), which supplies a pressure oil required for a speed change operation of an automatic transmission for output, with respect to the rotational driving force of the engine. <P>SOLUTION: The hydraulic control device 1 includes the oil pump 20, which is rotated and driven by the driving force of the engine 60 and supplies the pressure oil to the automatic transmission 70 for output which is provided in a first path K1 for transmitting the driving force of the engine 60 to an output shaft and a toroidal type continuously variable transmission 10 for pumping which is provided in the second path K2 for transmitting the driving force of the engine 60 to the oil pump 20. In the hydraulic control device, a part of the pressure oil supplied from the oil pump 20 is used for control of a variator, which controls the operation of the toroidal type continuously variable transmission 10 for pumping. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a hydraulic control device that supplies pressure oil to an output automatic transmission provided in a path for transmitting a rotational driving force of an engine to an output shaft.

In recent years, an automatic transmission (CVT (Continuously Variable Transmission) or AT (Automatic Transmission)) that changes the rotational driving force of an engine and transmits it to an output shaft has been widely used.
And since the oil pump that supplies the pressure oil necessary for the shift operation of the automatic transmission is always driven to rotate by the engine, the variable capacity or the variable speed is further improved for further fuel economy improvement. An efficient oil pump has been desired.
Therefore, in the prior art described in Patent Document 1, the rotational driving force of the engine is continuously transmitted to the N range, the R range, etc. without passing through the continuously variable transmission, and to the D range, etc. A second path that is transmitted via the transmission, and a configuration that is transmitted to the output shaft through the first path, the first oil pump that rotates in the first path, and the second path that rotates in the second path The second oil pump is configured so that when the rotational power of the engine is transmitted through the first path in the N range or the R range, the second oil pump does not rotate, and the engine drive loss is reduced. A continuously variable transmission that can be reduced is disclosed.
In the prior art described in Patent Document 2, an oil pump to which a flywheel is connected is used, and the rotational driving force of the engine is transmitted to the oil pump with a flywheel via a one-way clutch. Driving an oil pump configured so that the flywheel engages when the rotational speed is higher than the flywheel side, and the flywheel idles when the rotational speed on the flywheel side is higher than the rotational speed on the engine side An apparatus is disclosed.
In the prior art described in Patent Document 3, an oil pump transmission mechanism that changes the rotation speed of the oil pump relative to the rotation speed of the engine, and a pump that controls the pump transmission mechanism by determining the transmission speed of the continuously variable transmission. A continuously variable transmission control device having an oil pump transmission control unit that varies the rotational speed is disclosed.

JP-A-5-10416 JP 2008-128097 A JP 2009-216172 A

Conventionally, a system is used in which an oil pump is rotated by the rotational driving force of an engine, and pressure oil used for a speed change operation of a transmission is supplied from the oil pump. However, the rotational speed of the engine and the rotational speed of the oil pump are in a proportional relationship, and the oil pump is rotated at a rotational speed higher than necessary when the engine is rotating at a high speed, which is not preferable for improving fuel consumption.
Piston pumps are widely used as variable displacement pumps, but oil leakage from the piston pump part is unavoidable, the gap between the parts is small, and the durability is relatively low due to foreign matter contamination. It is very difficult to realize because the pressure must be high for transmission. In addition, when the capacity is reduced, the theoretical torque is reduced, but the pump loss torque is not reduced.From the viewpoint of the engine on the driving side, only the load for reducing the pump capacity can be reduced. Efficiency improvement cannot be expected.
In the prior art described in Patent Document 1, two oil pumps are switched according to the transmission path, and the second oil pump is rotated in the second path. It is rotated by the output shaft of the continuously variable transmission, and the second oil pump cannot be controlled at an efficient rotational speed (depending on the speed change state of the continuously variable transmission). It is not preferable for improvement.
In the prior art described in Patent Document 2, when the engine is at a high speed, the oil pump is rotated at an unnecessarily high number of revolutions and the flywheel needs to be rotated. It cannot be controlled, which is not preferable for improving fuel consumption.
In the prior art described in Patent Document 3, a speed change mechanism is provided in the oil pump, and the rotation speed of the oil pump can be changed with respect to the rotation speed of the engine. However, as a speed change mechanism, a path for transmitting rotational power to the oil pump via the one-way clutch, the third gear, and the fourth gear, a clutch that can be controlled by an actuator (actuated by pressure oil), the first gear, and the second gear Although a two-speed switching mechanism with a path for transmitting rotational power to the oil pump is disclosed, another oil pump that supplies pressure oil to be supplied to an actuator that controls the clutch is required. And it is necessary to control the rotation speed of the other oil pump so that the rotational driving force of the engine is not wasted by the other oil pump, but there is no description about this point.
The present invention was devised in view of the above points, and is an oil pump that supplies pressure oil necessary for a shifting operation of an automatic transmission for output (using a part of the rotational driving force of an engine). An object of the present invention is to provide a hydraulic control device that is more durable and can be more efficiently controlled with respect to the rotational driving force of the engine.

As means for solving the above-mentioned problems, a first invention of the present invention is a hydraulic control device as described in claim 1.
The hydraulic control device according to claim 1 is an oil that is rotationally driven by a driving force of an engine and supplies pressure oil to an output automatic transmission provided in a first path that transmits the driving force of the engine to an output shaft. A part of pressure oil supplied from the oil pump, comprising: a pump; and a toroidal continuously variable transmission for pump provided in a second path for transmitting the driving force of the engine to the oil pump Is a hydraulic control device used for controlling a variator that controls the operation of the toroidal type continuously variable transmission for the pump.

A second invention of the present invention is a hydraulic control device as set forth in claim 2.
A hydraulic control device according to a second aspect is the hydraulic control device according to the first aspect, wherein a member corresponding to an output of the toroidal type continuously variable transmission for pump and a rotor of the oil pump are integrally formed. The hydraulic control device is formed.

A third aspect of the present invention is a hydraulic control device as set forth in the third aspect.
A hydraulic control device according to a third aspect is the hydraulic control device according to the first or second aspect, further comprising an electric pump that supplies pressure oil to the automatic transmission for output when the engine is stopped. When the engine is stopped, a part of the pressure oil supplied from the electric pump is a hydraulic control device used for controlling a variator that controls the operation of the toroidal continuously variable transmission for the pump. is there.

By using the hydraulic control device according to claim 1, the rotational driving force of the engine is transmitted to the oil pump via the toroidal type continuously variable transmission for the pump, so that the durability is improved and the rotational speed of the engine is reduced. Thus, the oil pump can be controlled to an efficient rotational speed.
In addition, by supplying pressure oil necessary for the operation of the toroidal type continuously variable transmission for pumps from an oil pump controlled to an efficient rotational speed, the toroidal type continuously variable transmission for pumps can be controlled more efficiently. it can.

  In addition, according to the hydraulic control device of the second aspect, it is possible to reduce the size more simply, and the oil pump can be more efficiently reduced with less loss and less loss without using a transmission mechanism such as a gear. It is possible to realize a hydraulic control device that can transmit a rotational driving force.

  Further, according to the hydraulic control device of the third aspect, it is possible to appropriately control the toroidal type continuously variable transmission for the pump even when the engine is stopped. The pressure oil necessary for the output automatic transmission can be appropriately supplied from the oil pump.

1 is a block diagram illustrating an embodiment of a hydraulic control device 1 according to the present invention. It is a figure explaining the example which formed integrally the variator of the toroidal type continuously variable transmission 10 for pumps, and the rotor of an oil pump.

EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing. FIG. 1 is a block diagram for explaining an embodiment of a hydraulic control apparatus 1 according to the present invention.
As shown in FIG. 1, the hydraulic control device 1 of the present invention includes a toroidal continuously variable transmission 10 for a pump and an oil pump 20. In the example shown in FIG. 1, the hydraulic control device 1 also includes a control unit 50, a switching unit 40, and an electric pump 30 for more appropriately controlling the pump toroidal type continuously variable transmission 10.

As shown in FIG. 1, the rotational driving force of the engine 60 is transmitted to the output shaft via the output automatic transmission 70 in the first path K1, and used for rotational driving of wheels and the like.
Further, the rotational driving force (a part of the rotational driving force) of the engine 60 is transmitted to the rotor of the oil pump 20 through the pump toroidal continuously variable transmission 10 through the second path K2. The oil pump 20 supplies pressure oil necessary for the shifting operation of the output automatic transmission 70 to the output automatic transmission 70.
The control means 50 receives signals and the like relating to the operating states of the engine 60 and the output automatic transmission 70 (output rotation speed, etc.), and the control means 50 controls the electric pump 30 and the switching means 40 and also uses a toroidal pump. Controls the shifting operation and the like of the continuously variable transmission 10. In addition, description of the actuator etc. which change the toroidal type continuously variable transmission 10 for pumps by the control means 50 is abbreviate | omitted.
Pressure oil from the oil pump 20 and pressure oil from the electric pump 30 are input to the switching means 40, and the switching means 40 switches which pressure oil is supplied to the toroidal-type continuously variable transmission 10 for pump.
For example, when the control unit 50 detects that the engine 60 is stopped, the control unit 50 drives the electric pump 30, switches the switching unit 40 to the electric pump 30 side, and stops the electric pump 30 after the engine 60 is started. Then, the switching means 40 is switched to the oil pump 20 side.

The oil pump 20 is rotationally driven using the rotational driving force (a part of the rotational driving force) of the engine 60, and supplies pressure oil required for the shift operation of the output automatic transmission 70 and the like.
The pressure oil supplied from the oil pump 20 (or the electric pump 30) to the pump toroidal continuously variable transmission 10 through the switching means 40 controls the shifting operation of the pump toroidal continuously variable transmission 10 and the like. Used for variator control.
The electric pump 30 is driven mainly when the engine is stopped, and is used when the oil pump 20 that requires the rotational driving force of the engine 60 cannot supply pressure oil.

The toroidal-type continuously variable transmission 10 for a pump includes a so-called variator including input disks 11a and 11b, an output disk 12, and rollers 13a and 13b arranged between the input disk and the output disk. Have.
A rotational driving force from the engine 60 is input to the input disks 11a and 11b via the input shaft 14, and an output shaft 15 connected to the output disk 12 is input from the input disks 11a and 11b to the rollers 13a and 13b. The rotational driving force after the shift is transmitted to the output disk 12. Then, the rotor of the oil pump 20 is rotated from the output shaft 15.

In the configuration shown in the example of FIGS. 1 and 2, the output shaft 15 (member corresponding to the output) and the rotor of the oil pump 20 are integrally formed, so that the size can be reduced more simply. In addition, the rotational driving force can be transmitted to the oil pump 20 more efficiently without loss through a transmission mechanism such as a gear, with excellent durability and less loss.
Further, the housing portion of the oil pump 20 may be integrated with the output disk.

Further, as shown in FIG. 1, operations such as shifting of the toroidal type continuously variable transmission 10 for the pump (the force for pressing the input disks 11a and 11b in the opposite direction and the positions of the rollers 13a and 13b are moved and held. The pressure oil for controlling the variator for controlling the force) is supplied from the oil pump 20 that is controlled by the toroidal-type continuously variable transmission 10 for the pump to an efficient rotational speed. Thereby, it is not necessary to provide an oil pump dedicated to controlling the variator, the number of parts can be reduced, and the rotational driving force of the engine 60 can be used more efficiently.
When the engine 60 is stopped, as already described, pressure oil is supplied not from the oil pump 20 but from the electric pump 30, so that the state of the toroidal continuously variable transmission 10 for the pump before starting the engine is set to an appropriate state. I can keep it.
Further, the durability of the toroidal type continuously variable transmission 10 for pumps has already been evaluated for use as a wheel drive in various vehicles, and sufficient durability and reliability can be secured. .

Further, the speed change characteristic of the pump toroidal type continuously variable transmission 10 can be freely set by the control means 50. For example, when the engine torque is low and the rotation speed is low (below a predetermined rotation speed), the gear ratio of the toroidal type continuously variable transmission 10 for the pump is such that the rotation speed from the engine 60 and the rotation speed of the oil pump 20 are in a proportional relationship. In a region where the oil pump 20 is controlled to be constant and exceeds a predetermined number of revolutions, the pump toroidal type The gear ratio of the step transmission 10 is changed steplessly and smoothly.
Thereby, compared with the conventional oil pump which is directly connected to the rotational driving force of the engine 60 and rotates only in a proportional relationship, an efficiency improvement of several percent (that is, an improvement in fuel consumption) can be expected.

The hydraulic control device 1 of the present invention is not limited to the appearance, configuration, structure, processing, and the like described in the present embodiment, and various changes, additions, and deletions can be made without changing the gist of the present invention.
In the description of the present embodiment, an example of a configuration of a double cavity using three disks is shown, but a configuration of a single cavity using two disks may be used.
In the description of the present embodiment, the example in which the number of rotations of the oil pump 20 is controlled to be shifted has been described. A toroidal-type continuously variable transmission can be applied for shift control of a pump or the like.
In the description of the present embodiment, the full toroidal pump toroidal continuously variable transmission 10 has been described as an example. However, a half toroidal continuously variable transmission may be used instead.

DESCRIPTION OF SYMBOLS 1 Hydraulic control apparatus 10 Toroidal type continuously variable transmission for pumps 11a, 11b Input disk 12 Output disk 13a, 13b Rotor 14 Input shaft 15 Output shaft 20 Oil pump 30 Electric pump 40 Switching means 50 Control means 60 Engine 70 Automatic transmission for output Machine

Claims (3)

An oil pump that is rotationally driven by the driving force of the engine and supplies pressure oil to the output automatic transmission provided in the first path that transmits the driving force of the engine to the output shaft;
A toroidal continuously variable transmission for a pump provided in a second path for transmitting the driving force of the engine to the oil pump;
A part of the pressure oil supplied from the oil pump is used to control a variator that controls the operation of the toroidal type continuously variable transmission for the pump.
Hydraulic control device. The hydraulic control device according to claim 1,
A member corresponding to the output of the toroidal type continuously variable transmission for the pump and the rotor of the oil pump are formed integrally.
Hydraulic control device. The hydraulic control device according to claim 1 or 2,
And an electric pump that supplies pressure oil to the output automatic transmission when the engine is stopped.
When the engine is stopped, a part of the pressure oil supplied from the electric pump is used to control a variator that controls the operation of the toroidal type continuously variable transmission for the pump.
Hydraulic control device.

Images