WO2011142269A1

WO2011142269A1 - Hydraulic control device for automatic transmission

Info

Publication number: WO2011142269A1
Application number: PCT/JP2011/060315
Authority: WO
Inventors: 好文村上; 木村　浩一; 岡崎　祐治; 功田伏
Original assignee: 本田技研工業株式会社
Priority date: 2010-05-12
Filing date: 2011-04-27
Publication date: 2011-11-17
Also published as: JP5465325B2; JPWO2011142269A1; CN102834651B; CN102834651A

Abstract

The over-stroking of a spool, which is caused by an abnormal increase in line pressure, is effectively prevented while suppressing the impact on the setting value or structural layout of a regulator valve to a minimum. Disclosed is a hydraulic control device for an automatic transmission, which is provided with a regulator valve (20) disposed on a hydraulic circuit (1) connected to an oil pump (P), a line pressure adjusting means (15) which adjusts the line pressure so that the line pressure increases by moving a spool (23) to the closing side in accordance with the increase in the stator reaction of a torque converter (T), and a line pressure switching means (55) which switches the line pressure between low line pressure and high line pressure by switching the supply of auxiliary oil pressure by means of a solenoid valve (50), wherein, when the auxiliary oil pressure supplied to the regulator valve (20) increases beyond the ranges of a normal value, the auxiliary oil pressure is released as a consequence of the solenoid output pressure port (36) and a release port (37) connecting, thereby preventing the spool (23) from over-stroking.

Description

Hydraulic control device for automatic transmission

The present invention relates to a hydraulic control device for an automatic transmission that regulates the hydraulic pressure of hydraulic oil supplied to each part of the automatic transmission to a predetermined line pressure by a regulator valve installed in a hydraulic circuit connected to a hydraulic pressure source.

Conventionally, for example, as shown in Patent Document 1, a regulator valve that regulates basic hydraulic pressure supplied from an oil pump serving as a hydraulic pressure source has been provided, and the engagement of a friction engagement element such as a clutch provided in an automatic transmission by the regulator valve. There is a hydraulic control device that generates a line pressure as a source pressure of the combined hydraulic pressure.

The regulator valve of the hydraulic control device disclosed in Patent Document 1 is configured to increase the line pressure in accordance with the stator reaction force of the torque converter. That is, in a vehicle equipped with the hydraulic control device described above, the output of the engine is transmitted to the pump impeller of the torque converter via the crankshaft, the torque is amplified by the turbine impeller, and the reaction force of this torque is used as the stator impeller. Car will bear. A stator arm for controlling the regulator valve of the hydraulic control device is fixed to the stator impeller. A stator reaction force is applied to the spring receiving cylinder of the regulator valve via the stator arm. Therefore, when the stator reaction force increases, the stator spring connected to the spring receiving cylinder is compressed, and accordingly, the spring receiving cylinder moves to increase the set load of the pressure regulating spring of the regulator valve, and the hydraulic oil passage Line pressure increases. Accordingly, when a load is applied to the line pressure of the hydraulic circuit when the vehicle is stopped, the line pressure can be increased based on the load, so that the fuel economy (fuel consumption) of the vehicle can be improved. it can.

Furthermore, the above hydraulic control device is provided with line pressure switching means having a solenoid valve for supplying auxiliary pressure to the regulator valve. The solenoid valve can switch the line pressure into two stages of a low line pressure and a high line pressure by switching the supply of auxiliary pressure to the regulator valve. Therefore, in areas where high engagement hydraulic pressure is not required due to vehicle operating conditions, the line pressure is switched to low pressure with the auxiliary pressure of the solenoid valve to reduce the oil pump drive torque and the friction torque of the automatic transmission. Thus, fuel economy can be improved.

JP 2009-281414 A

By the way, in the hydraulic control device described above, when a malfunction such as an open failure occurs in the open oil passage on the downstream side of the regulator valve in a state where the output pressure of the solenoid valve acts on the regulator valve as a feedback pressure, the line pressure is increased. There is a problem that it rises (abnormally rises) beyond the normal value range. When the line pressure rises abnormally, the feedback pressure rises, resulting in an overstroke to the position where the spool of the regulator valve hits the valve cap. When such an overstroke occurs, the line pressure cannot be released at all, and therefore the supply destination of the line pressure becomes an abnormally high pressure, causing a failure of each part of the automatic transmission.

Measures to increase the spring load of the pressure regulating spring of the regulator valve and to adopt a layout in which the spool is grounded at an early stage are taken to cope with the above problems. However, by taking these measures, there is a problem that the set value of the stall pressure of the regulator valve, the degree of freedom of the layout of the stator reaction force transmission structure, and the like are limited.

The present invention has been made in view of the above-described points, and an object of the present invention is to effectively prevent a spool overstroke associated with an abnormal increase in line pressure, and to set a regulator valve set value and layout. It is an object of the present invention to provide a hydraulic control device for an automatic transmission capable of minimizing the influence on the transmission.

In order to solve the above-mentioned problems, the present invention relates to the hydraulic pressure of the hydraulic oil supplied to each part of the automatic transmission by means of a regulator valve (20) installed in the hydraulic circuit (1) connected to the hydraulic pressure source (P). In the hydraulic control device for an automatic transmission that regulates pressure, the regulator valve (20) includes a spool (23) biased by biasing means (27, 29), and a hydraulic port disposed around the spool (23). (35, 36), and operates the spool (23) by switching the hydraulic pressure supplied to the hydraulic ports (35, 36), between the drive source (E) and the transmission mechanism (M). Line pressure adjusting means (15) for adjusting the line pressure to increase by moving the spool (23) to the closed side in response to an increase in the torque reaction force of the torque transmission mechanism (T) installed in the power transmission path of And an auxiliary hydraulic pressure supply valve (50) for supplying auxiliary hydraulic pressure to the regulator valve (20), and switching the supply of the auxiliary hydraulic pressure by the auxiliary hydraulic pressure supply valve (50), the line pressure is reduced to the low line pressure and the high line. Line pressure switching means (55) for switching to the pressure, and the regulator valve (20) includes an auxiliary hydraulic pressure input port (36) for inputting the auxiliary hydraulic pressure and an auxiliary hydraulic pressure release for releasing the auxiliary hydraulic pressure. Port (37), and when the auxiliary hydraulic pressure supplied from the auxiliary hydraulic pressure supply valve (50) to the regulator valve (20) rises outside the normal range, the spool (23) moves beyond the specified range. Thus, the auxiliary hydraulic pressure input port (36) and the auxiliary hydraulic pressure release port (37) communicate with each other.

According to the hydraulic control device for an automatic transmission according to the present invention, when the auxiliary hydraulic pressure input to the auxiliary hydraulic pressure input port abnormally rises, the auxiliary hydraulic pressure release port before the spool enters an overstroke state exceeding the allowable range. The auxiliary hydraulic pressure of the auxiliary hydraulic pressure input port can be released. Therefore, the overstroke of the spool can be effectively prevented. As a result, there is no need to take measures to increase the urging force of the urging means of the regulator valve or to adopt a layout in which the spool is grounded at an early stage, as in the prior art. Therefore, it is possible to ensure the flexibility of the set value of the regulator valve and the layout of the torque reaction force transmission structure. Further, according to the present invention, the overstroke of the spool of the regulator valve can be effectively prevented, so that the resistance against an abnormal increase in the auxiliary hydraulic pressure can be improved as compared with the conventional structure.

Further, according to another aspect of the present invention, the hydraulic pressure of the hydraulic oil supplied to each part of the automatic transmission is set to a predetermined line pressure by the regulator valve (20) installed in the hydraulic circuit (1) connected to the hydraulic pressure source (P). In the hydraulic control device for an automatic transmission that regulates pressure, the regulator valve (20) includes a spool (23) biased by biasing means (27, 29), and a hydraulic port disposed around the spool (23). (35, 36), and operates the spool (23) by switching the hydraulic pressure supplied to the hydraulic ports (35, 36), between the drive source (E) and the transmission mechanism (M). Line pressure adjusting means (15) for adjusting the line pressure to increase by moving the spool (23) to the closed side in response to an increase in the torque reaction force of the torque transmission mechanism (T) installed in the power transmission path of ) And an auxiliary hydraulic pressure supply valve (50) for supplying auxiliary hydraulic pressure to the regulator valve (20), and switching the supply of the auxiliary hydraulic pressure by the auxiliary hydraulic pressure supply valve (50) changes the line pressure between the low line pressure and the high line pressure. Line pressure switching means (55) for switching to the output pressure from the output port (35) from which the hydraulic pressure after regulation by the regulator valve (20) is output as the original pressure of the auxiliary hydraulic pressure supply valve (50) When the auxiliary hydraulic pressure supplied from the auxiliary hydraulic pressure supply valve (50) to the regulator valve (20) rises outside the normal value range, the spool (23) exceeds the specified range. As a result, the input port (31) supplying the hydraulic pressure to the output port (35) is closed or narrowed, and the auxiliary hydraulic pressure supplied to the regulator valve (20) is reduced. Characterized by being configured to be pressed.

According to the hydraulic control device for an automatic transmission according to the present invention, when the auxiliary hydraulic pressure input to the auxiliary hydraulic pressure input port of the regulator valve rises abnormally, the auxiliary pressure is increased before the spool enters the overstroke state exceeding the allowable range. The auxiliary hydraulic pressure of the auxiliary hydraulic pressure input port can be reduced by closing or narrowing the input port that supplies the hydraulic pressure to the output port from which the original pressure of the hydraulic pressure supply valve is discharged. Therefore, an overstroke exceeding the allowable range of the spool can be effectively prevented. As a result, there is no need to take measures to increase the urging force of the urging means of the regulator valve or to adopt a layout in which the spool is grounded at an early stage, as in the prior art. Therefore, it is possible to ensure the flexibility of the set value of the regulator valve and the layout of the torque reaction force transmission structure. Further, according to the present invention, the overstroke of the spool of the regulator valve can be effectively prevented, so that the resistance against an abnormal increase in the auxiliary hydraulic pressure can be improved as compared with the conventional structure.

Further, according to another aspect of the present invention, the hydraulic pressure of the hydraulic oil supplied to each part of the automatic transmission by a regulator valve (20) installed in the hydraulic circuit (1) connected to the hydraulic pressure source (P) is set to a predetermined line. In the hydraulic control device of the automatic transmission that regulates the pressure, the regulator valve (20) includes a spool (23) biased by the biasing means (27, 29), and a hydraulic pressure disposed around the spool (23). A spool valve that operates the spool (23) by switching the hydraulic pressure supplied to the hydraulic ports (35, 36), and includes a drive source (E) and a transmission mechanism (M). A line pressure adjusting means (adjusted so that the line pressure increases by moving the spool (23) to the closed side in accordance with an increase in the torque reaction force of the torque transmission mechanism (T) installed in the power transmission path between them) 5) and an auxiliary hydraulic pressure supply valve (50) for supplying auxiliary hydraulic pressure to the regulator valve (20), and by switching the supply of auxiliary hydraulic pressure by the auxiliary hydraulic pressure supply valve (50), the line pressure is reduced to a low line pressure. A line pressure switching means (55) for switching to a high line pressure, and a regulator valve (20) includes an input port (31) to which an original pressure before pressure regulation from a hydraulic pressure source (P) is supplied; And a source pressure release port (38) for releasing the source pressure of the input port (31), and supplies the hydraulic pressure before pressure regulation from the hydraulic source (P) as the source pressure of the auxiliary hydraulic pressure supply valve (50). When the auxiliary hydraulic pressure supplied from the auxiliary hydraulic pressure supply valve (50) to the regulator valve (20) rises outside the normal value range, the spool (23) moves beyond the specified range. In the input port (31) and the original pressure release port (38) is characterized by being configured to communicate.

According to the hydraulic control device for an automatic transmission described above, when the auxiliary hydraulic pressure input to the auxiliary hydraulic pressure input port abnormally increases, the input pressure of the input port is reduced by the main pressure release port before the spool enters an overstroke state exceeding the allowable range. The original pressure can be released. Thereby, since the original pressure of the auxiliary hydraulic pressure supply valve to which the hydraulic pressure from the same hydraulic pressure source is supplied is reduced, the auxiliary hydraulic pressure supplied to the auxiliary hydraulic pressure input port can be reduced. Therefore, an overstroke exceeding the allowable range of the spool can be effectively prevented. As a result, there is no need to take measures to increase the urging force of the urging means of the regulator valve or to adopt a layout in which the spool is grounded at an early stage, as in the prior art. Therefore, it is possible to ensure the flexibility of the set value of the regulator valve and the layout of the torque reaction force transmission structure. Further, according to the present invention, the overstroke of the spool of the regulator valve can be effectively prevented, so that the resistance against an abnormal increase in the auxiliary hydraulic pressure can be improved as compared with the conventional structure.

Further, in the hydraulic control device for the automatic transmission described above, the torque transmission mechanism is a fluid type torque converter (T), and the line pressure adjusting means (15) increases the stator reaction force of the torque converter (T). Accordingly, the regulator valve (20) may be controlled to be closed.
In addition, the code | symbol in said parenthesis shows the code | symbol of the component in embodiment mentioned later as an example of this invention.

According to the hydraulic control device for an automatic transmission according to the present invention, it is possible to effectively prevent an overstroke of the spool due to an abnormal increase in the line pressure, while at the same time affecting the set value of the regulator valve and the layout of the structure. Can be minimized.

1 is a schematic view of a vehicle to which a hydraulic control device for an automatic transmission according to the present invention is applied. It is a figure which shows the structural example of the hydraulic circuit in the hydraulic control apparatus of the automatic transmission concerning 1st Embodiment of this invention. It is a figure for demonstrating the flow of the hydraulic fluid in the hydraulic circuit of 1st Embodiment, (a) is the state in which the feedback pressure by a solenoid valve is a normal value, (b) is the state which the said feedback pressure raised abnormally. FIG. It is a figure which shows the other structural example of the hydraulic circuit concerning 1st Embodiment. It is a figure which shows the hydraulic circuit in the hydraulic control apparatus of the automatic transmission concerning 2nd Embodiment of this invention. It is a figure for demonstrating the flow of the hydraulic fluid in the hydraulic circuit of 2nd Embodiment, (a) is the state in which the feedback pressure by a solenoid valve is a normal value, (b) is the state which the said feedback pressure raised abnormally. FIG. It is a figure which shows the other structural example of the hydraulic circuit concerning 2nd Embodiment. It is a figure which shows the hydraulic circuit in the hydraulic control apparatus of the automatic transmission concerning 3rd Embodiment of this invention. It is a figure for demonstrating the flow of the hydraulic fluid in the hydraulic circuit of 3rd Embodiment, (a) is the state where the feedback pressure by a solenoid valve is a normal value, (b) is the state which the said feedback pressure raised abnormally. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[First Embodiment]

FIG. 1 is a schematic view of a vehicle to which a hydraulic control device for an automatic transmission according to the present invention is applied. The vehicle shown in the figure includes an engine E, a fluid type torque converter (torque transmission mechanism) T connected to the engine E, a speed change mechanism M connected to the torque converter T, a differential device Df, and the like. The hydraulic control device for an automatic transmission according to the present invention is provided in the transmission mechanism M. The output of the engine E is transmitted to the drive wheels W and W ′ via the crankshaft 101 through the torque converter T, the transmission mechanism M, and the differential device Df in order.

The torque converter T is supported on the input shaft 105 so as to be rotatable relative to the pump impeller 102 connected to the crankshaft 101 of the engine E, the turbine impeller 103 connected to the input shaft 105 of the transmission mechanism M, and the like. The stator impeller 104 is connected to the stator shaft 104a via a one-way clutch 107. The torque transmitted from the crankshaft 101 to the pump impeller 102 is hydrodynamically transmitted to the turbine impeller 103, during which torque amplification is performed. At this time, the stator impeller 104 bears a reaction force of the torque (hereinafter referred to as “stator reaction force”).

At the right end of the pump impeller 102, a pump drive gear 108 for driving an oil pump P (see FIG. 2) described later is provided. At the right end of the stator shaft 104a, an operating arm (stator arm) 24 for controlling a regulator valve 20 described later at high line pressure is provided.

The transmission mechanism M is an automatic transmission mechanism for a vehicle that can set a plurality of shift stages. The speed change mechanism M includes, for example, a speed change mechanism having a plurality of gear trains corresponding to each speed stage, a plurality of clutches and brakes (friction engagement elements), and an endless belt between a pair of pulleys. A belt type continuously variable transmission mechanism or the like that is stretched over is used. Note that the configuration of the speed change mechanism M is not a feature of the present invention, and thus detailed illustration and description thereof will be omitted.

FIG. 2 is a diagram illustrating a configuration example of a hydraulic circuit provided in the hydraulic control device of the automatic transmission according to the first embodiment of the present invention. The hydraulic circuit 1 shown in FIG. 1 adjusts the oil pump P serving as a hydraulic pressure source and the basic hydraulic pressure supplied from the oil pump P to generate the engagement hydraulic pressure of a friction engagement element such as a clutch provided in the transmission mechanism M. And a regulator valve 20 that generates a line pressure as a pressure. In addition, a relief valve is provided in an oil passage (lubricating oil passage) 14 disposed on the downstream side of the regulator valve 20 so as to be released when the oil pressure (lubricating pressure) in the oil passage 14 reaches a predetermined pressure. 70 is installed. The downstream oil passage 5 through which the hydraulic oil discharged from the regulator valve 20 circulates is connected to the torque converter T, and the oil passage 6 is a portion where lubrication is required such as a shaft, gear, bearing, clutch (all (Not shown).

The regulator valve 20 includes a housing 21, a spool 23 slidably fitted in a cylinder bore 22 provided in the housing 21, and an operating arm 24 that rotates as the stator reaction force of the torque converter T increases. The first spring spring 26 is in contact with the operating arm 24, the stator spring 25 is provided between the spring receiver 26 and the housing 21, and the first spring 23 is provided between the spool 23 and the spring receiver 26 without play. A pressure regulating spring (biasing means) 27 and a second pressure regulating spring (biasing means) 29 provided with play between the spool 23 and the spring receiving cylinder 26 are provided. A small-diameter shaft portion 23a is coaxially formed at the axial rear end of the spool 23, and the pressure regulating springs 27 and 29 are disposed so as to surround the shaft portion 23a in a double manner. The housing 21 is formed with a small-diameter cylinder bore 22 whose front end is closed, and a large-diameter sliding bore 28 that is coaxially connected to the rear end of the cylinder bore 22.

The spring receiving cylinder 26 is formed in a bottomed cylindrical shape having a closed end at one end, and a flange portion 26a protruding outward in the radial direction is formed at the closed end. And it is slidably fitted to the sliding bore 28 with the closed end as the rear position. The operating arm 24 is in contact with the outer surface of the closed end of the spring receiving cylinder 26, and the stator spring 25 is provided between the flange portion 26 a and the housing 21.

The operating arm 24 is in the initial position shown in FIG. 2 in a state where the stator reaction force of the torque converter T is not acting. As the stator reaction force increases, the operating arm 24 compresses the stator spring 25 to It is designed to move forward. That is, the regulator valve 20 is configured to control the line pressure in accordance with the stator reaction force of the torque converter T.

Further, the regulator valve 20 includes

hydraulic ports

35 and 36 for operating the spool 23 arranged around the spool 23, and the spool valve is configured to operate the spool 23 by switching the hydraulic pressure supplied to the

hydraulic ports

35 and 36. It is. As

hydraulic ports

35 and 36 for operating the spool 23, a solenoid output pressure port (low-line pressure feedback port) 36 which is an auxiliary hydraulic input port disposed in a gap between the closed end of the cylinder bore 22 and the tip 23b of the spool 23; A feedback port (high line pressure feedback port) 35 disposed next to the solenoid output pressure port 36 is provided. In the following description, a state in which the spool 23 is positioned on the left end side in the cylinder bore 22 is referred to as a forward position, and the spool 23 resists the urging force of the

pressure adjusting springs

27 and 29 from the forward position in the cylinder bore 22. The state moved to the right side is called a retreat position.

A first inlet port (original pressure input port) 31 and a second inlet port 32 that communicate with the

oil passages

3 and 4 from the oil pump P are provided on the inner surface of the cylinder bore 22. Also, a first outlet port 33 that communicates with the torque converter TC via the oil passage 5 and a second outlet port 34 that communicates with the portion requiring lubrication such as a shaft, gear, bearing, and clutch via the oil passage 6. Is provided. Further, a step is provided at a position adjacent to the first inlet port 31 on the inner surface of the cylinder bore 22, and a feedback port 35 is provided at the step. On the other hand, on the outer peripheral surface of the spool 23, a first annular groove 41 that communicates with the first inlet port 31 or the first outlet port 33 and the second inlet port 32 or the second outlet according to the axial position of the spool 23. A second annular groove 42 communicating with the port 34 is provided. Further, a step 43 is formed at a position facing the feedback port 35 on the outer peripheral surface of the spool 23. A communication path 44 that communicates the first annular groove 41 and the step 43 is provided inside the spool 23. The communication passage 44 communicates the first inlet port 31 facing the first annular groove 41 and the feedback port 35 facing the step 43.

The first annular groove 41 communicates with the first inlet port 31 and the first outlet port 33 when the spool 23 is in the retracted position, but when the spool 23 is in the advanced position, 1 outlet port 33 is formed to be blocked. The second annular groove 42 communicates the second inlet port 32 and the second outlet port 34 when the spool 23 is in the retracted position, but the second inlet port 32 when the spool 23 is in the advanced position. And the second outlet port 34 are formed to be blocked.

The upstream side of the solenoid valve 50 communicates with the oil passage 7 connected to the oil passage 2 from the oil pump P, and the downstream side thereof communicates with the solenoid output pressure port 36 of the regulator valve 20 via the oil passage 8. Yes. Therefore, by switching on / off of the solenoid valve 50, the discharge pressure of the oil pump supplied from the oil passage 7 is used as a source pressure, and the solenoid output pressure port 36 of the regulator valve 20 is set to increase / decrease the line pressure by the regulator valve 20. A signal pressure (feedback pressure) for switching is supplied.

As described above, the hydraulic control apparatus according to the present embodiment is a stator reaction force of the torque converter (torque transmission mechanism) T installed in the power transmission path between the engine (drive source) E and the automatic transmission (transmission mechanism) M. By moving the spool 23 of the regulator valve 20 to the closed side in accordance with an increase in (torque reaction force), line pressure adjusting means 15 for adjusting the line pressure to increase, and feedback pressure (auxiliary hydraulic pressure) to the regulator valve 20 ) And a line pressure switch for switching the line pressure of the regulator valve 20 between a low line pressure and a high line pressure by switching the feedback pressure supplied by the solenoid valve 50. Means 55.

The regulator valve 20 of the present embodiment is provided with a release port (auxiliary hydraulic pressure release port) 37 for releasing the feedback pressure from the solenoid valve 50 at a position adjacent to the solenoid output pressure port 36. Although the detailed illustration is omitted, the release port 37 communicates with the hydraulic pressure release portion such as the oil tank U through the oil passage 9 on the downstream side thereof. The release port 37 is closed by the spool 23 when the spool 23 is in the forward position, and the spool 23 resists the biasing force of the

pressure adjusting springs

27 and 29 by the pressure of the solenoid output pressure port 36 and the feedback port 35. Then, when it moves further rearward than the retracted position, it communicates with the solenoid output pressure port 36 in the cylinder bore 22.

The basic operation of the regulator valve 20 configured as described above will be described. The oil pump P sucks up the hydraulic oil from the oil tank U and pumps it to the oil passage 2. This hydraulic pressure (original pressure) is supplied to the regulator valve 20 via the

oil passages

3 and 4, adjusted to a predetermined line pressure by the regulator valve 20, and then the torque converter TC via the

oil passages

5 and 6. Or, it is sent to places where lubrication is required, such as shafts, gears, bearings, and clutches. Here, in a region where a high engagement hydraulic pressure is not required, the hydraulic pressure supplied from the oil pump P is received by the oil passage 7, and the solenoid valve 50 is opened by the control of an automatic control unit (ECU) of the vehicle (not shown). (ON). When the solenoid valve 50 is opened, the hydraulic pressure (feedback pressure for low line pressure) supplied to the solenoid output pressure port 36 via the

oil passages

7 and 8 and the feedback via the oil passage 3, the first inlet port 31 and the communication passage 44 are fed back. The regulator valve 20 is controlled by both the hydraulic pressure supplied to the port 35 (feedback pressure for low line pressure), and the pressure receiving area of the spool 23 is increased, so that the line pressure regulated by the regulator valve 20 is reduced. Switch to line pressure.

On the other hand, when high engagement hydraulic pressure is required, the line pressure is switched from low pressure to high pressure. In this case, by closing (OFF) the solenoid valve 50 under the control of an automatic control unit (not shown), hydraulic oil (feedback pressure for low line pressure) is not supplied to the oil passage 8, and the oil passage 3 and the first inlet The regulator valve 20 is controlled only by the hydraulic pressure supplied to the feedback port 35 via the port 31 and the communication path 44, and the pressure receiving area of the regulator valve 20 is reduced, so that the line pressure is switched from the low line pressure to the high line pressure.

Further, when the line pressure is high, the regulator valve 20 directly applies the stator reaction force of the torque converter T to the spring receiving cylinder 26 of the regulator valve 20 via the operation arm 24. When the stator reaction force increases, the stator spring 25 connected to the spring receiving cylinder 26 is compressed. Thereby, the set load of the pressure regulating springs 27 and 29 of the regulator valve 20 increases, and the line pressure of the hydraulic oil passage increases.

Here, the operation of the release port 37 provided in the regulator valve 20 having the above configuration will be described. FIG. 3 is a diagram for explaining the flow of hydraulic oil in the hydraulic circuit 1. FIG. 3A is a diagram in which the feedback pressure (low line pressure feedback pressure) supplied to the solenoid output pressure port 36 is within a normal value range. It is a figure which shows a state, (b) is a figure which shows the state which the said feedback pressure raised abnormally.

When the feedback pressure supplied to the solenoid output pressure port 36 is within the normal range with the solenoid valve 50 open, the load due to the pressure of the solenoid output pressure port 36 and the feedback port 35 applied to the spool 23 And the urging force of the

pressure adjusting springs

27 and 29 are maintained, and the stroke amount of the spool 23 is within a specified range as shown in FIG. At this time, the release port 37 is closed by the spool 23. In this state, if a malfunction such as a defective opening occurs in the

oil passages

5 and 6 on the downstream side of the regulator valve 20 and the line pressure rises abnormally beyond the normal value range, the solenoid valve 50 causes the solenoid output pressure to increase. The feedback pressure supplied to the port 36 rises abnormally. Then, the load due to the pressure of the solenoid output pressure port 36 applied to the spool 23 becomes excessive, and the spool 23 strokes beyond the specified range. At this time, as shown in FIG. 3 (b), the tip 23b of the spool 23 moves to the right beyond the position of the release port 37, so that the release port 37 that has been blocked by the spool 23 until then is output to the solenoid. It communicates with the pressure port 36. As a result, the feedback pressure supplied to the solenoid output pressure port 36 is released from the release port 37 and is reduced, so that the stroke of the spool 23 is stopped. At this time, since the first inlet port 31 is closed by the spool 23, the feedback pressure previously supplied from the first inlet port 31 to the feedback port 35 is also limited. By these, the overstroke exceeding the allowable range of the spool 23 can be effectively regulated.

Thus, in the regulator valve 20 of the present embodiment, the release port 37 for releasing the hydraulic pressure of the solenoid output pressure port 36 is provided at a position adjacent to the solenoid output pressure port 36. As a result, when the feedback pressure supplied to the solenoid output pressure port 36 abnormally increases, the solenoid output pressure port 36 and the release port 37 communicate with each other before the spool 23 enters an overstroke state exceeding the allowable range. The feedback pressure is reduced. Therefore, the overstroke of the spool 23 can be prevented. As a result, there is no need to take measures for preventing the overstroke of the spool 23 in the pressure regulating springs 27 and 29 provided in the regulator valve 20 and the stator reaction force transmission structure. The degree of freedom of layout of the value and stator reaction force transmission structure can be increased. Further, according to the regulator valve 20, since the overstroke of the spool 23 can be effectively prevented by the action of the release port 37, the resistance against an abnormal increase in the feedback pressure by the solenoid valve 50 is improved as compared with the conventional structure. be able to.

FIG. 4 is a diagram illustrating another configuration example of the hydraulic circuit 1 according to the first embodiment. The hydraulic circuit 1 ′ shown in the figure further includes a modulator valve 80 installed in the oil passage 7 upstream of the solenoid valve 50 with respect to the hydraulic circuit 1 shown in FIG. 1. The modulator valve 80 is a pressure reducing valve for defining an upper limit value of input pressure to the solenoid valve 50. Therefore, in the configuration example shown in FIG. 4, the hydraulic pressure controlled by the modulator valve 80 is supplied as the original pressure of the feedback pressure by the solenoid valve 50. Other configurations and operations are the same as the configuration example shown in FIG.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In the description of the second embodiment and the corresponding drawings, the same or corresponding components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted below. In addition, matters other than those described below are the same as those in the first embodiment. This is the same in other embodiments.

FIG. 5 is a diagram showing a hydraulic circuit 1-2 in the hydraulic control device for an automatic transmission according to the second embodiment of the present invention. The hydraulic circuit 1-2 of the present embodiment is configured to supply the original pressure of the solenoid valve 50 that switches the line pressure between high and low from a feedback port (output port) 35 of the regulator valve 20. That is, in the hydraulic circuit 1 of the first embodiment, the oil path 7 on the upstream side of the solenoid valve 50 is directly connected to the oil path 2 from the oil pump P, whereas the hydraulic circuit of the present embodiment. In 1-2, the oil passage 7 on the upstream side of the solenoid valve 50 is connected to the feedback port 35 of the regulator valve 20.

The operation of the hydraulic circuit 1-2 having the above configuration will be described. FIG. 6 is a diagram for explaining the flow of hydraulic oil in the hydraulic circuit 1-2. FIG. 6A is a diagram showing a state in which the feedback pressure supplied to the solenoid output pressure port 36 is within a normal value range. (B) is a figure which shows the state which the said feedback pressure raised abnormally.

When the feedback pressure supplied to the solenoid output pressure port 36 is within the normal range with the solenoid valve 50 open, the solenoid output pressure applied to the spool 23 as shown in FIG. The load due to the pressure of the port 36 and the feedback port 35 and the urging force of the

pressure adjusting springs

27 and 29 are balanced, and the stroke amount of the spool 23 is within the specified range. At this time, since the first annular groove 41 of the spool 23 faces the first inlet port 31, the first inlet port 31 and the feedback port 35 communicate with each other via the communication path 44. Therefore, the feedback pressure is supplied to the feedback port 35, and the original pressure is supplied to the solenoid valve 50 via the feedback port 35.

In this state, when a malfunction such as an open failure occurs in the

oil passages

5 and 6 on the downstream side of the regulator valve 20 and the line pressure rises abnormally, the feedback pressure supplied to the solenoid output pressure port 36 by the solenoid valve 50 becomes abnormal. To rise. Then, the load due to the pressure of the solenoid output pressure port 36 applied to the spool 23 becomes excessive, and the spool 23 strokes beyond the specified range. At this time, as shown in FIG. 6B, the first annular groove 41 of the spool 23 moves to a position on the right side of the first inlet port 31, so that the first annular groove 41 and the communication passage 44 communicate with each other until then. The communication between the first inlet port 31 and the feedback port 35 is blocked. Thereby, the hydraulic pressure supply to the feedback port 35 is stopped. Then, since the original pressure supplied from the feedback port 35 to the solenoid valve 50 is also stopped, the supply of the feedback pressure to the solenoid output pressure port 36 is stopped. Therefore, further strokes of the spool 23 are stopped. By these, the overstroke exceeding the allowable range of the spool 23 can be effectively regulated.

As described above, the hydraulic circuit 1-2 according to the present embodiment is configured to supply the original pressure of the solenoid valve 50 for switching the line pressure between high and low from the feedback port 35 of the regulator valve 20. As a result, when the feedback pressure supplied to the solenoid output pressure port 36 abnormally increases, the supply of hydraulic oil to the feedback port 35 is cut off before the spool 23 of the regulator valve 20 enters an overstroke state exceeding the allowable range. As a result, the supply of the feedback pressure to the solenoid output pressure port 36 is stopped, so that an overstroke of the spool 23 can be prevented. As a result, as in the first embodiment, it is not necessary to take measures to prevent the overstroke of the spool 23 in the pressure regulating springs 27 and 29 provided in the regulator valve 20 and the stator reaction force transmission structure. The degree of freedom in layout of the

springs

27 and 29 and the stator reaction force transmission structure can be increased. Further, according to the regulator valve 20 of the present embodiment, the overstroke of the spool 23 can be effectively prevented, so that the resistance against an abnormal increase in feedback pressure by the solenoid valve 50 can be improved as compared with the conventional structure. .

FIG. 7 is a diagram showing another configuration example of the hydraulic circuit 1-2 according to the second embodiment. The hydraulic circuit 1-2 ′ shown in the figure further includes a modulator valve 80 installed in the oil passage 7 upstream of the solenoid valve 50 with respect to the hydraulic circuit 1-2 shown in FIG. Therefore, in the configuration example shown in FIG. 7, the hydraulic pressure controlled by the modulator valve 80 is supplied as the original pressure of the feedback pressure by the solenoid valve 50. Other configurations and operations are the same as the configuration example shown in FIG.

[Third Embodiment]
Next, a third embodiment of the present invention will be described. FIG. 8 is a diagram showing a hydraulic circuit in the hydraulic control device for an automatic transmission according to the third embodiment of the present invention. The hydraulic circuit 1-3 of the present embodiment has a release port (release pressure) for releasing the original pressure (line pressure) supplied to the first inlet port 31 at a position adjacent to the first inlet port 31 of the regulator valve 20. (Original pressure release port) 38 is provided. That is, in the hydraulic circuit 1 of the first embodiment, the release port 37 for releasing the solenoid output pressure port 36 to which the feedback pressure from the solenoid valve 50 is supplied is provided. In the circuit 1-3, a release port 38 for releasing the first inlet port 31 is provided. Although not shown in detail, the release port 38 communicates with a hydraulic release part such as an oil reservoir U through the oil passage 12. A third annular groove 45 is formed in the spool 23 at a position facing the release port 38.

When the spool 23 is in the forward position, the third annular groove 45 of the spool 23 is in a position facing only the release port 38, and the release port 38 is closed. On the other hand, the spool 23 moves further rearward than the retracted position against the urging force of the pressure regulating springs 27 and 29 by the pressure of the solenoid output pressure port 36 and the feedback port 35, so that the third annular groove 45 is released from the release port. 38 and the first inlet port 31. As a result, the release port 38 and the first inlet port 31 communicate with each other via the third annular groove 45.

The operation of the hydraulic circuit 1-3 having the above configuration will be described. FIG. 9 is a diagram for explaining the flow of hydraulic oil in the hydraulic circuit 1-3. FIG. 9A is a diagram showing a state in which the feedback pressure supplied to the solenoid output pressure port 36 is within a normal value range. (B) is a figure which shows the state which the said feedback pressure raised abnormally.

When the feedback pressure supplied to the solenoid output pressure port 36 is within the normal value range with the solenoid valve 50 open, the solenoid output pressure applied to the spool 23 as shown in FIG. The load due to the pressure of the port 36 and the feedback port 35 and the urging force of the

pressure adjusting springs

27 and 29 are balanced, and the stroke amount of the spool 23 is within the specified range. At this time, since the third annular groove 45 of the spool 23 faces only the release port 38, the gap between the release port 38 and the first inlet port 31 is blocked. At this time, since the first annular groove 41 faces the first inlet port 31, the first inlet port 31 and the feedback port 35 communicate with each other via the communication path 44. Therefore, hydraulic pressure is supplied to the feedback port 35.

In this state, if a failure such as a defective opening occurs in the

oil passages

5 and 6 on the downstream side of the regulator valve 20 and the line pressure rises abnormally beyond the normal value range, the solenoid valve 50 causes the solenoid output pressure port 36 to The supplied feedback pressure rises abnormally. Then, the load due to the pressure of the solenoid output pressure port 36 applied to the spool 23 becomes excessive, and the spool 23 strokes beyond the specified range. At this time, as shown in FIG. 9B, the release port that has been closed until then is moved by moving the third annular groove 45 of the spool 23 to a position straddling both the release port 38 and the first inlet port 31. 38 communicates with the first inlet port 31. As a result, the original pressure supplied to the first inlet port 31 is released, so the original pressure of the solenoid valve 50 to which the hydraulic pressure from the oil pump P is supplied is reduced. Therefore, the feedback pressure supplied to the solenoid output pressure port 36 via the solenoid valve 50 is also reduced. Further, at this time, the first annular groove 41 of the spool 23 moves to a position on the right side of the first inlet port 31, so that the first annular port 41 and the communication passage 44 communicated with the first inlet port 31 until then. The connection with the feedback port 35 is closed. Thereby, the hydraulic pressure supply to the feedback port 35 is stopped. As a result, further strokes of the spool 23 are stopped. Accordingly, the overstroke of the spool 23 can be effectively regulated.

Thus, in the hydraulic circuit 1-3 of the present embodiment, the release port 38 for releasing the original pressure supplied to the first inlet port 31 of the regulator valve 20 is provided. As a result, when the feedback pressure supplied to the solenoid output pressure port 36 abnormally increases, the original pressure of the solenoid valve 50 can be reduced before the spool 23 exceeds the specified range and enters an overstroke state. Thereby, since the feedback pressure by the solenoid valve 50 can be reduced, the overstroke of the spool 23 can be prevented. Therefore, as in the first and second embodiments, it is not necessary to take measures for preventing the overstroke of the spool 23 in the pressure regulating springs 27 and 29 provided in the regulator valve 20 and the stator reaction force transmission structure. The degree of freedom of the layout of the pressure regulating springs 27 and 29 and the stator reaction force transmission structure can be increased. Further, according to the regulator valve 20, since the overstroke of the spool 23 can be effectively prevented by the action of the release port 38, the resistance against the abnormal increase of the feedback pressure by the solenoid valve 50 is improved as compared with the conventional structure. be able to.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible.

For example, in the above embodiment, the torque transmission mechanism according to the present invention is a fluid type torque converter, and the line pressure adjusting means controls the regulator valve to the closed side in accordance with an increase in the stator reaction force of the torque converter. However, if the torque transmission mechanism of the present invention is a torque transmission mechanism installed in the power transmission path between the drive source and the transmission mechanism, the specific mechanism is the same as that of the above embodiment. A mechanism other than that shown may be used. Therefore, for example, a speed reduction mechanism including a planetary gear mechanism installed between the engine and the speed change mechanism can be adopted as the torque transmission mechanism of the present invention. In that case, an operating arm for operating the regulator valve may be provided on the sun gear shaft fixed to the sun gear of the planetary gear mechanism, and the regulator valve may be controlled by the torque reaction force of the sun gear.

Claims

In a hydraulic control device for an automatic transmission that regulates the hydraulic pressure of hydraulic oil supplied to each part of the automatic transmission to a predetermined line pressure by a regulator valve installed in a hydraulic circuit connected to a hydraulic pressure source,
The regulator valve is a spool valve that includes a spool urged by urging means and a hydraulic port arranged around the spool, and operates the spool by switching the hydraulic pressure supplied to the hydraulic port,
A line pressure that is adjusted so that the line pressure increases by moving the spool to the closed side in response to an increase in the torque reaction force of the torque transmission mechanism installed in the power transmission path between the drive source and the transmission mechanism. Adjusting means;
A line pressure switching means for switching the line pressure between the low line pressure and the high line pressure by switching the supply of the auxiliary oil pressure by the auxiliary oil pressure supply valve; And having
The regulator valve includes an auxiliary hydraulic pressure input port for inputting the auxiliary hydraulic pressure, and an auxiliary hydraulic pressure release port for releasing the auxiliary hydraulic pressure,
When the auxiliary hydraulic pressure supplied from the auxiliary hydraulic pressure supply valve to the regulator valve rises outside the normal value range, the spool moves beyond a specified range, so that the auxiliary hydraulic pressure input port and the auxiliary hydraulic pressure release A hydraulic control device for an automatic transmission, characterized in that it is configured to communicate with a port.
In a hydraulic control device for an automatic transmission that regulates the hydraulic pressure of hydraulic oil supplied to each part of the automatic transmission to a predetermined line pressure by a regulator valve installed in a hydraulic circuit connected to a hydraulic pressure source,
The regulator valve is a spool valve that includes a spool urged by urging means and a hydraulic port arranged around the spool, and operates the spool by switching the hydraulic pressure supplied to the hydraulic port,
A line pressure that is adjusted so that the line pressure increases by moving the spool to the closed side in response to an increase in the torque reaction force of the torque transmission mechanism installed in the power transmission path between the drive source and the transmission mechanism. Adjusting means;
A line pressure switching means for switching the line pressure between the low line pressure and the high line pressure by switching the supply of the auxiliary oil pressure by the auxiliary oil pressure supply valve; And having
As the original pressure of the auxiliary hydraulic pressure supply valve, configured to supply the discharge pressure from the output port from which the hydraulic pressure after pressure regulation by the regulator valve is output,
When the auxiliary hydraulic pressure supplied from the auxiliary hydraulic pressure supply valve to the regulator valve rises outside the normal value range, the spool moves beyond a specified range to supply hydraulic pressure to the output port. A hydraulic control device for an automatic transmission, wherein the input port is closed or narrowed so that the auxiliary hydraulic pressure supplied to the regulator valve is reduced.
In a hydraulic control device for an automatic transmission that regulates the hydraulic pressure of hydraulic oil supplied to each part of the automatic transmission to a predetermined line pressure by a regulator valve installed in a hydraulic circuit connected to a hydraulic pressure source,
The regulator valve is a spool valve that includes a spool urged by urging means and a hydraulic port arranged around the spool, and operates the spool by switching the hydraulic pressure supplied to the hydraulic port,
A line pressure that is adjusted so that the line pressure increases by moving the spool to the closed side in response to an increase in the torque reaction force of the torque transmission mechanism installed in the power transmission path between the drive source and the transmission mechanism. Adjusting means;
A line pressure switching means for switching the line pressure between the low line pressure and the high line pressure by switching the supply of the auxiliary oil pressure by the auxiliary oil pressure supply valve; And having
The regulator valve includes an input port to which an original pressure for pressure adjustment from the hydraulic source is supplied, and an original pressure release port for releasing the original pressure of the input port,
As the original pressure of the auxiliary hydraulic pressure supply valve, configured to supply hydraulic pressure before pressure regulation from the hydraulic pressure source,
When the auxiliary hydraulic pressure supplied from the auxiliary hydraulic pressure supply valve to the regulator valve rises outside the normal value range, the spool moves beyond a specified range, so that the input port, the original pressure release port, A hydraulic control device for an automatic transmission, characterized in that is configured to communicate with each other.
The torque transmission mechanism is a fluid type torque converter,
The automatic transmission according to any one of claims 1 to 3, wherein the line pressure adjusting means controls the regulator valve to be closed in accordance with an increase in a stator reaction force of the torque converter. Hydraulic control device.