JPS616456A - Hydraulic controller for fluid type torque converter equipped with lock-up clutch - Google Patents

Abstract

PURPOSE:To prevent the generation of large shock on speed change by preventing the reduction of the oil flow-rate in a fluid type torque converter by carrying-out release of a lock-up clutch at a proper low speed. CONSTITUTION:The reduction of the hydraulic pressure of the control signal port 27 of a lock-up signal control valve 40 to a switching set oil pressure after the switching operation of the signal control valve 40 is delayed. Therefore, the sharp releasing operation of a lock-up clutch 10 is avoided, and the oil pressure is gradually reduced, generating clutch slide. The degree of delay in the reduction of the switching set oil pressure is determined by the setting of the throttle degree of an orifice 33 installed at the drain port 47 of the signal control valve 40.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a hydraulic control device for a hydraulic torque converter with a lock-up clutch used in an automatic transmission for a vehicle, and particularly relates to a hydraulic control device for controlling the release of a lock-up clutch. Concerning the control device.

BACKGROUND OF THE INVENTION As one type of hydraulic torque converter for automatic transmissions used in vehicles such as automobiles, a lock-up clutch (which selectively mechanically connects an input member such as a pump impeller and an output member such as a turbine runner) is used. Some models are equipped with a direct coupling clutch).

The lock-up clutch of the hydraulic torque converter with a lock-up clutch as described above is generally hydraulically operated, and the hydraulic pressure in the first oil chamber on one side of the clutch member and the second oil chamber on the other side of the clutch member are generally hydraulically operated. When the hydraulic pressure in the first oil chamber is greater than the hydraulic pressure in the second oil chamber, the first oil chamber engages and mechanically connects the input member and the output member. the input member and the output member are connected to each other, and are configured to be released when the oil pressure in the second oil chamber is higher than the oil pressure in the first oil chamber to release the mechanical connection between the input member and the output member, and the oil pressure is The control includes an engagement switching position in which the first oil chamber is connected to the hydraulic pressure supply source and the second oil chamber is connected to the drain port, and an engagement switching position in which the first oil chamber is connected to the drain boat and the second oil chamber is connected to the drain port. A hydraulic control device including a lock-up control valve having a valve element that moves between an oil chamber and a release switching position connecting the oil chamber to a hydraulic supply source, and a lock-up signal control valve that controls switching operation of the lock-up control valve. It is being done.

In the past, the above-described hydraulic control devices were generally not configured to control the release speed of the lock-up clutch, and the release of the lock-up clutch occurred relatively rapidly, thus causing the lock-up clutch to disengage during the power-on condition. When released, the output torque of the transmission suddenly and temporarily decreases, causing a large shock and deteriorating ride comfort.

If the lock-up clutch is released relatively slowly, a sudden drop in the output torque of the transmission can be avoided and a large shock will not occur. In order to release the lock-up clutch relatively slowly, a restricting means may be provided in the middle of the oil passage connecting the lock-up control valve and the hydraulic torque converter, but in this case, the lock-up clutch is released. The lower converter oil flow rate decreases, causing a problem that the oil temperature rises to JO<.

OBJECTS OF THE INVENTION The object of the present invention is to provide an improved hydraulic control device that allows the lock-up clutch to be released at an appropriate low speed without causing a decrease in the converter oil flow rate when the lock-up clutch is released. It is said that

According to the present invention, the above object is to reduce the pressure difference between the oil pressure in the first oil chamber on one side of the clutch member and the oil pressure in the second oil chamber on the other side of the clutch member. In response, when the oil pressure in the first oil chamber is higher than the oil pressure in the second oil chamber, the input member and the output member are mechanically connected, and the oil pressure in the second oil chamber is lower than the first oil pressure. In the hydraulic control device for a hydraulic torque converter, the hydraulic torque converter is equipped with a lock-up clutch that is released when the hydraulic pressure is higher than the hydraulic pressure in the oil chamber of the hydraulic torque converter, and releases the mechanical connection between the input member and the output member. a first boat connected to the first oil chamber, a second boat connected to the second oil chamber, a hydraulic pressure supply boat supplied with a first value of hydraulic pressure, a drain boat, and a second boat connected to the second oil chamber; a first switching position connecting the first boat to the hydraulic supply port and connecting the second port to the third boat depending on the hydraulic pressure supplied to the control signal port; a lock-up control valve having a lock-up control valve having a valve element that moves between a second switching position connecting the first port to the drain boat and a second switching position connecting the second port to the hydraulic supply port; When controlling the hydraulic pressure supplied to the signal port and outputting the hydraulic pressure for positioning the valve element of the lock-up control valve to the first position to the control signal port, the third port is connected to the drain oil path. The valve element of the lock-up control valve is placed in the second switching position v+!
a lock-up signal control valve that supplies a second value of oil pressure greater than the first value to the third port when outputting oil pressure to the control signal boat; and the valve of the lock-up control valve. Hydraulic delay means for delaying transmission of hydraulic pressure for positioning the element to the second position to the control signal boat; and hydraulic delay means for delaying transmission of the hydraulic pressure of the second value to the third port. This is achieved by a hydraulic control device for a hydraulic torque converter with a lock-up clutch.

Effects of the Invention According to the configuration as described above, even if the lock-up signal control valve outputs hydraulic pressure to the control signal port to position the valve element of the lock-up control valve in the second position, the valve element is switched to the second position. During this delay period, a second value of hydraulic pressure is gradually supplied to the second chamber of the hydraulic torque converter, which causes the lock-up clutch release to be delayed and the converter oil under the lock-up clutch release This is done at an appropriately low speed without reducing the flow rate, and avoids generating large shocks.

DESCRIPTION OF EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 shows the main parts of one embodiment of a hydraulic control device for a hydraulic torque converter with a lock-up clutch according to the present invention. In the figure, 1 indicates a hydraulic torque converter with a lock amplifier clutch. The hydraulic torque converter 1 includes a converter casing 3 connected to an input shaft 2, a pump impeller 4 connected to the converter casing 3, a turbine runner 6 connected to an output shaft 5, and a one-way clutch 7. Fixed support member 8
A lock-up clutch (clutch member) 10 is connected to the output shaft 5 and mechanically connects the input shaft 2 and the output shaft 5 by selectively engaging the converter casing 3. have.

The hydraulic torque converter 1 includes a lock-up clutch 1
A first oil chamber 1 is provided on one side of the 0, includes a truss-shaped annular passage constituted by a pump impeller 4, a turbine runner 6, and a stator 9, and directly communicates with a second port 11.
2 and a second oil chamber 14 provided on the other side of the lock-up clutch 10 and communicating face-to-face with the second port 13. When the oil pressure is higher than the oil pressure in the second oil chamber 14, it is pressed against the converter casing 3 and mechanically connects the input shaft 2 and output shaft 5 to each other. When the oil pressure is higher than 12, the converter casing 3 is pulled by the converter casing 3 to release the mechanical connection between the input shaft 2 and the output shaft 5.

The first port 11 of the hydraulic torque converter 1 is connected to the oil passage 1
5 to the first port 21 of the lock-up control valve 20
The second port 13 is connected to the second port 22 of the lock-up control valve 20 by an oil passage 16.

The lock-up control valve 20 is configured as a spool valve and includes a valve element 24 and a piston element 25. The valve element 24 is forced upward in the figure by the line oil pressure Pc applied to the port 26, and when the line oil pressure PL is not applied to the control signal boat 27, it is in the raised position as shown in the right half of the figure. On the other hand, when the line oil pressure PL is applied to the control signal port 27, it is located at the lower position (first position) as shown in the left half of the figure. It looks like this.

The lock-up control valve 20 connects the first port 21 to the hydraulic supply boat 28 when its valve element 24 is in the lowered position.
and the second port 22 is connected to the third port 23, and the first port 21 is connected to the drain boat 29 and the second port 2 is connected to the drain boat 29 when the valve element 24 is in the raised position.
2 is connected to the hydraulic pressure supply port 28.

The hydraulic pressure supply port 1 28 is connected to a well-known converter hydraulic control valve (secondary regulator valve) which is not shown in the figure, and is configured to be supplied with converter oil fPc from the converter hydraulic control valve. -1 The inverter oil pressure pc is always a low value than the line oil pressure PLJ, which is regulated by a well-known line oil pressure control valve (primary regulator valve).

A throttle portion 32 is provided in the third port 23 of the lock-up control valve 20, and the throttle portion 32 is connected to the third port 1.
2 and oil line 30, it is connected to port I/43 of lock-up signal control valve/IO, and control port 13 is connected to port 1-27.
4 is connected to a port 41 of a lock-up signal control valve/10 by an oil passage 31.

A hydraulic accumulator 34 is connected in the middle of the oil passage 31. Hydraulic accumulator 34 is shilling bore 3
5 has a screw 36 movably received in its axial direction, the piston 36 having a port 37 on one side thereof.
Accumulator chamber 3 into which hydraulic pressure from oil passage 31 is introduced
8 has been determined. A compression coil spring 39 is installed between the piston 36 and the end wall of the cylinder bore 35 with a predetermined preload applied thereto. The chamber 38 is biased in the direction of decreasing its volume.

The lock-up signal control valve 40 is configured as a spool valve and includes a valve element 42. When hydraulic pressure is applied to the control signal boat 45, the valve element 42 is located in a lowered position as shown in the right half of the figure against the spring force of the compression coil spring 46, whereas the control signal boat 45 is in a lowered position as shown in the right half of the figure. port 45
When no hydraulic pressure is applied to the holder, the spring force of the compression coil spring 46 causes the holder to be in the raised position as shown in the left half of the figure. A lock-up signal control valve 40 connects port 41 to drain port 47 and port 43 to port 48 when valve element 42 is in the lowered position, and connects port 41 to drain port 48 when valve element 42 is in the raised position. 48-, and the port 43 is connected to the drain boat 44. ``The drain boat 47 is provided with a J throttle section 33, and the flow rate of drained oil from the train port 47 is controlled by the throttle section 33. Hydraulic pressure PL is supplied.

Line oil pressure PL is selectively supplied to the control signal port 45 of the lock knob signal control valve 40 from an oil passage 49. A solenoid valve 50 is connected in the middle of the oil passage 49. Solenoid valve 50 C, electromagnetic coil 52
When the valve is energized, the valve element 54 moves away from the valve seat 55 against the spring force of the compression coil spring 53, opening 56 to the drain port 1, and the electromagnetic coil 42 is energized. Compression coil spring 5 when not
The valve element 54 is seated on the valve seat portion 55 by the spring force of 3, thereby closing the drain boat 56. Therefore, when the electromagnetic coil 52 of the solenoid valve 5o is energized, the oil pressure in the control signal port 45 of the lock-up signal control valve 40 is discharged from the drain boat 56 and disappears.
2 is not energized, line oil pressure PL acts on the control signal port 45.

When the lock-up clutch 10 is engaged, the electromagnetic coil 52
is energized and the drain boat 56 is opened.

At this time, as the hydraulic pressure in the control signal port 45 of the lock-up signal control valve 40 disappears, the valve element of the lock-up signal control valve 40 is positioned at the raised position due to the spring force of the compression coil spring 46, and the port 41 is connected to the port 48. The boat 43 is connected to the drain boat 44, and the line oil pressure PL of the port 48 is supplied from the port 41 through the oil line 31 to the control signal boat 27 of the lock-up control valve 20, and this oil pressure causes the valve element of the lock-up control valve 20 to be 24 is in the lower position, the first port 21 is connected to the hydraulic supply boat 28 and the second port 22 is connected to the third port 23. As a result, the converter hydraulic pressure pc of the hydraulic pressure supply port 28 is changed to the port 21 and the oil passage 15.
The second oil chamber 14 flows into the first chamber 12 from the first port 11 through゜ Drain port 4 via port 43 of lock-up signal control valve 40
Connected to 4.

By connecting the oil passages as described above, the oil pressure P+ in the first oil chamber 12
becomes larger than the hydraulic pressure P2 of the second hydraulic pressure 14, and the lock-up clutch 10 is pressed against the converter casing 3 and becomes engaged, and the input shaft 2 and the output shaft 5 are mechanically connected by the lock-up clutch 10. be done. still,
At this time, the line hydraulic pressure PL is introduced into the accumulator chamber 38 of the hydraulic accumulator 34, so that the piston 36 moves against the spring force of the three compression coil springs and is located at the stroke end position.

Disengagement of the lock-up clutch 10 is started when the energization to the electromagnetic coil 52 is stopped. When the electromagnetic coil 52 is de-energized, the drain port 5
6 is closed and line oil pressure PL is applied to the control signal port 45 of the lock-up signal control valve 40.
The valve element 42 of the lock-up signal control valve 40 moves from the raised position to the lowered position, and the port 41 is moved from the port 48 to the lowered position.
The lockup IVI control well 20 is connected to the drain port 47 in place of the lockup IVI control well 20
The oil pressure of the control signal port 27 is connected to the oil passage 31 and the port 41.
The water is then discharged from the drain port 47. Since the drain port 47 is provided with the constriction portion 33, the hydraulic pressure is gradually discharged, and the control signal port 2
As shown in FIG.
gradually decreases at a speed determined by the degree of aperture. When the hydraulic pressure Pp decreases to a predetermined value, the piston 36 of the hydraulic accumulator 34 starts moving toward the initial position due to the spring force of the compression coil spring 39. Hydraulic pressure is now discharged from drain port 47,
As a result, the oil pressure Pp of the control signal port 27 gradually decreases at a lower speed. After the hydraulic pressure in the accumulator chamber 38 is completely discharged, the hydraulic pressure Pp in the control signal port 27 decreases again at a speed determined by the degree of restriction of the throttle section 33, and after this, the hydraulic pressure Pp in the control signal port 27 increases to the lock-up control valve. 20, the lock-up control valve 20 is switched when it is below the switching setting oil pressure Ps of 20.

Due to the action like a secondary chain, the oil pressure Pp of the control signal port 27 is kept from decreasing to the switching setting oil pressure ps after the switching operation of the lock-up signal control valve 40, and the time point 1- when the lock-up signal control valve 40 is switched is delayed. + to said oil pressure P
Below the point when p drops to the switching setting oil pressure ps? During the
Even though the valve line 42 of the lock-up signal control valve 40 is located at the lowered position, the lock-up control valve 20
The valve element 24 remains in the lowered position.

During this period (, 1 baud (to
It flows into the second oil chamber 14 from the second port 13 through the pipe. Since the throttle part 32 is provided in the port 23, the line oil pressure PL is gradually supplied to the second oil chamber 14, and accordingly, the oil pressure P2 in the second oil chamber 14 is changed to the second oil chamber 14. As shown in Fig. 3, it gradually rises at a degree determined by the degree of restriction of the throttle part 32.At this time, the converter oil pressure pc continues to be supplied to the first oil chamber 12; Oil chamber: I2 oil pressure P+ and second oil chamber 14
The difference between the hydraulic pressure P2 and the hydraulic pressure P2 gradually decreases as the hydraulic pressure P2 increases, and the lock-up clutch 10 is gradually released while causing clutch slippage. This avoids a sudden release operation of the lock-up clutch 10, and avoids generating a large shock when the lock-up clutch is released.

When a predetermined time (T2--r+) has elapsed since the switching operation of the lock-up signal control valve 40, the switching operation of the lock-up control valve 20 is performed as described above, and the valve element 24 thereof is moved from the lowered position to the raised position. By moving the first port 21 to the drain port 29 instead of the hydraulic supply port 28, and the second port 21 to the hydraulic supply port 28 instead of the third port 23, The oil valve 12 is connected to the drain and the converter hydraulic pressure pc is supplied to the second oil chamber 14. As a result, the M release of the lock j'-tube clutch 10 is completed.

In addition, in the first embodiment, the lock-up clutch 10
When the lock-up clutch 10 is engaged, the hydraulic pressure of the second hydraulic pressure 14 is discharged through the third bow 23 having the constriction part 32, so that the lock-up clutch 10 is gradually engaged. This prevents large shocks from occurring at the same time.

Although the present invention has been described in detail with respect to specific embodiments above, the present invention is not limited thereto.
It will be apparent to those skilled in the art that various embodiments are possible within the scope of the invention.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing the main parts of one embodiment of a hydraulic control device for a hydraulic torque converter with a lock-up clutch according to the present invention, and FIG. FIG. 3 is a graph showing the hydraulic characteristics of the control signal port of the control valve, and FIG. 3 is a graph showing the hydraulic characteristics of the oil chamber of the hydraulic torque converter obtained by the operation of the hydraulic control device according to the present invention. 1...Hydraulic torque converter with lock-up clutch, 2...Input shaft, 3...Converter casing. Runner, 7... one-way clutch, 8... fixed support member. 9... Stator, 10... Lock-up clutch,
11... First port, 12... First oil chamber, 13
...Second port, 14...Second oil chamber, 15.1
6... Oil passage, 20... Lock-up control valve, 21...
...First port, 22...Second port, 23...
・Third port. 24... Valve element, 25... Piston, 26... Port. 27... Control signal port, 28... Hydraulic pressure supply port.

Claims (1)

[Scope of Claims] In response to the pressure difference between the oil pressure in the first oil chamber on one side of the clutch member and the oil pressure in the second oil chamber on the other side of the clutch member, Engages to mechanically connect the input member and output member when the oil pressure is greater than the oil pressure in the second oil chamber, and releases when the oil pressure in the second oil chamber is greater than the oil pressure in the first oil chamber. In a hydraulic control device for a hydraulic torque converter including a lock-up clutch for releasing mechanical connection between the input member and the output member, a control signal port and a first oil chamber connected to the first oil chamber are provided. a second port connected to the second oil chamber, a hydraulic pressure supply port supplied with a first value of hydraulic pressure, a drain port, a third port, and the control signal port. a first switching position connecting the first port to the hydraulic pressure supply port and connecting the second port to the third port in response to hydraulic pressure supplied to the drain port; a lock-up control valve having a valve element connected to the port and moving between a second switching position connecting the second port to the hydraulic pressure supply port; and controlling hydraulic pressure supplied to the control signal port. When the hydraulic pressure for positioning the valve element of the lock-up control valve in the first position is being output to the control signal port, the third port is connected to the drain oil passage, and the valve element of the lock-up control valve is output to the first position. lock-up signal control that supplies hydraulic pressure of a second value greater than the first value to the third port when hydraulic pressure for positioning the valve element in the second switching position is output to the control signal port; a hydraulic delay means for delaying transmission of hydraulic pressure that causes the valve element of the lock-up control valve to the second position to the control signal port; A hydraulic control device for a hydraulic torque converter with a lock-up clutch, characterized by having a hydraulic delay means for delaying the transmission of the torque to a port.