JP2874160B2 - Hydraulic control device for automatic transmission for vehicles - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement of a hydraulic control device for an automatic transmission for a vehicle.
You. [Prior art] A technique for changing the engagement force of an engagement element in accordance with a shift speed,
That is, at low gears where the transmission torque is relatively large, engagement is required.
To increase the torque capacity by increasing the
At high speeds where the torque is relatively small, the engaging force of the engaging element
And reduce the torque capacity to match the transmission torque.
Technology to reduce the drive loss of hydraulic pumps
-209. What is described in the publication is shown in FIGS.
As described above, when the first speed is achieved (third speed).
(Figure) shows the solenoid 432 of the 1-2 shift device 430 in the ON state.
Therefore, the oil pump
Oil passage 425 communicating with pump 401 is blocked by valve 431.
The hydraulic chamber 409 at the end of the pressure regulator valve 405
Oil passage 434 communicating with the discharge port 434a,
The line pressure of oil passage 421 is regulated to a relatively high value,
Supplied to the clutch 306 and compared via the clutch 306.
Can transmit large torque, and the 2nd speed and 2nd speed
When the third gear is achieved (Figs. 4 and 5), the
Since the solenoid 432 is in the OFF state, the oil passage 425 and the
The oil path 434 is in communication with the oil path 434, and the oil pressure in the oil path 421 is regulated.
Acting on the hydraulic chamber 409 of the valve 405, the line of the oil passage 421
Pressure is adjusted to a relatively low value that matches the transmission torque.
Engagement element for achieving second or third speed
To increase the engaging force of the engaging element more than necessary.
Has a configuration to reduce the drive loss of the oil pump 401
I have. [Problems to be Solved by the Invention] However, in the above-described configuration, the first speed is changed to the second speed.
Of line pressure in oil passage 421 at the time of shifting to the next gear
At the same time as switching of the 1-2 shift device 430, that is, shifting
Is performed in the initial state, so that the second speed
The control of the hydraulic pressure supplied to the engagement element to achieve
Cause a shift shock.
There was a condition. [Means for Solving the Problems] The present invention has been made in view of the above, and has a relatively high speed conversion.
A plurality of engagement elements including a high-speed engagement element for achieving a speed
The automatic transmission for vehicles equipped with
This reduces the hydraulic pressure supplied to the high-speed engagement element.
Supply the signal oil pressure to the regulator valve and the regulator valve
Possible supply position and supply to the regulator valve
Can be switched to the discharge position to discharge the above signal oil pressure
A switching valve, and the supply hydraulic pressure to the high-speed engagement element
Becomes high oil pressure corresponding to the end of engagement of the high-speed engagement element
And the switching valve is switched to the supply position.
Control device for an automatic transmission for vehicles
It is the gist. [Operation] According to the configuration of the present invention, the hydraulic pressure supplied to the high-speed engagement element
Corresponds to the end of engagement of the high-speed engagement element (that is, the end of shift).
Signal pressure is supplied to the regulator valve
Since the supply oil pressure is reduced, the engagement force of the engagement element
Corresponds to the gear position.
High speed and speed change with relatively small torque transmitted through the element
At the same time as pump drive loss can be reduced during
In addition, the shifting force is easily controlled during shifting,
Can also be reduced. [Embodiment] An embodiment of the present invention will be described in detail with reference to FIGS.
explain. FIG. 1 shows an automatic change that can achieve four forward speeds and one reverse speed.
FIG. 3 is a skeletal view showing a gear transmission of a high-speed gear, and an engine (not shown).
The drive shaft 10 directly connected to the crankshaft of the
Torque converter via the input casing 14 of the
12 connected to the pump 16 and the torque converter 12
The stator 18 has a speed change gear via a one-way clutch 20.
It is connected to the thing 22. In addition, the torque converter
The turbine 24 of the turbine 12 serves as a third engagement element via an input shaft 26.
Overdrive clutch 28, as the fourth engagement element
Connect to the underdrive clutch 30 and the reverse clutch 32
The output side of the overdrive clutch 28
Through a first intermediate shaft 34, a first simple planetary gear set 36 (hereinafter, referred to as a first planetary gear set 36).
The first carrier 38 and the second carrier of the first
Simple planetary gear set 40 (hereinafter simply referred to as second gear set 40)
And the second carrier 42 of the first
As a first engagement element for stopping rotation of the intermediate shaft 34
Connected to the low reverse brake 44
The output side of the clutch 30 is connected to the first sun of the first gear train 36.
The output side of the reverse clutch 32 is connected to the second gear
A first ring gear of the first gear train 36 via an intermediate shaft 48;
50 and the second sun gear 52 of the second gear train 40
A second for stopping rotation of the second intermediate shaft 48;
It is connected to a 2-4 brake 54 as an engagement element. The first gear device 36 includes the first sun gear 46 and the first sun gear 4.
The first pinion gear 56 meshing with 6 and the pinion gear 56
The first key, which is rotatably supported and rotatable by itself.
Carrier 38, the first pinion gear 56 meshes with the first pinion gear 56.
A ring gear 50;
Is the second sun gear 52, and the second pin
Nion gear 58, rotatably supports the pinion gear 58
The second carrier 42, which can rotate with itself,
Consists of a second ring gear 60 that meshes with the two pinion gear 58
Have been. The second ring gear 60 is connected to the first ring gear 60.
Output gear via a hollow output shaft 62 through which the intermediate shaft 34 is inserted
Connected to 64. The output gear 64 is disposed substantially parallel to the input shaft 26.
Driven gear 68 provided at the right end of the intermediate transmission shaft 66
The intermediate transmission shaft 66 is meshed through the idler 70.
Is connected to a drive axle 74 via a differential gearing 72.
Connected to the final reduction gear 76. As is clear from FIG.
Gears 22 from the torque converter 12 to the output gear 64, and
Formed to include the transmission shaft 66, differential gear device 72, etc.
Have been. Each of the above clutches and brakes has its own piston
Or a servo device to supply and discharge hydraulic pressure.
By doing so, engagement and release are performed. And the above oil pressure
Indicates each clutch and brake by a hydraulic control device (not shown).
And the clutch and brake are activated
Achieves 4 forward gears and 1 reverse gear
Is done. Table 1 shows the operation of each clutch and brake and the speed status.
The relationship is shown in the table,
Indicates the engagement of the switch or brake, and the "-" mark indicates
Indicates release. In the above configuration, the low reverse brake 44 and the
When the drive clutch 30 is engaged, the first carrier 38
The second carrier 42 is fixed to become a reaction force element, and the drive shaft
The driving force from 10 is the torque converter 12, the input shaft 26,
Drive clutch 30, first sun gear 46, first pinion gear
56, first ring gear 50, second sun gear 52, second pinion gear
Gear 58, and transmitted to the output shaft 62 via the second ring gear 60,
Furthermore, the output gear 64, the intermediate transmission shaft 66, and the final reduction gear 76
And transmitted to the drive axle 74 as shown in Table 1.
First speed is achieved. Next, the engaged state of the underdrive clutch 30 was maintained.
Release brake 44 and engage brake 54
Stops the rotation of the first ring gear 50 and the second sun gear 52
And the driving force is changed to the first sun gear 46,
Carrier 38, second carrier 42, second ring gear 60, output shaft 6
2 to the output gear 64 to achieve the second speed
You. Next, the engaged state of the underdrive clutch 30 was maintained.
Release the 2-4 brake 54 and leave the overdrive clutch
28, the first sun gear 46 and the first carrier 38
Are integrally rotated, so that the entire first gear unit 36 is integrally formed.
Rotate. Therefore, the second sun gear 52 and the second carrier
Since the 42 rotates integrally, the entire second gear train 40 is also integrated.
And the input shaft 26 and the output gear 64 rotate at the same speed.
Third speed is achieved. Further, the engagement state of the overdrive clutch 28 is maintained.
Release the underdrive clutch 30 and break 2-4
When the key 54 is engaged, the second sun gear 52 becomes a reaction force element
Therefore, the driving force is reduced to the first intermediate shaft, the second sun gear 52, and the second pinion.
Output gear via on-gear 58, second carrier 42, output shaft 62
The rotation of the output gear 64 is transmitted to the input shaft 26
A fourth overdrive speed is also achieved. Next, the overdrive clutch 28 and the 2-4 brake 54
Disengage the reverse clutch 32 and low reverse
When the brake 44 is engaged, the second carrier 42
And the driving force is changed to the second intermediate shaft, the second sun gear 52, and the second pin.
Output via the nonion gear 58, the second ring gear 60, and the output shaft 62
The transmission is transmitted to the gear 64 to achieve the reverse gear. Next, in the gear transmission shown in FIG.
Of the hydraulic control device to achieve each gear
The operation of will be described. The hydraulic control device shown in FIG.
Pump 82 via oil passage 84 and oil passage 84
The oil pressure discharged to oil passage 88 from
Of the gear transmission shown in FIG.
Switches 28, 30, 32 and brakes 44, 54
To the clutch and brake depending on the driving condition of the vehicle.
Selective supply and discharge, mainly with regulator valve
Pressure regulator valve 100, torque converter control valve 200, manual valve 30
0, the first solenoid valve 400A as the first shift device,
The second solenoid valve 400B as the second shift device,
Third solenoid valve 400C as shift device, third shift
4th solenoid valve 400D as G valve, line pressure switching valve 50
0, the first fail-safe valve 600 as the first switching means,
2nd fail-safe valve 700 as switching means
Each element is connected by an oil passage. The pressure regulating valve 100 changes the oil pressure (line pressure) of the oil passage 88 to the gear position.
The pressure is adjusted to the desired value corresponding to
A land 106 having a pressure surface 104 and a receiving surface facing the pressure surface 104
A land 112 having a pressure surface 108 and a pressure receiving surface 110;
A land 118 having a pressure receiving surface 114 and a pressure receiving surface 116 facing
It has a pressure receiving surface 120 and a pressure receiving surface 122 facing the pressure receiving surface 116.
Receiving surface 126 substantially facing the land 124 and the pressure receiving surface 122.
And a land 130 having a pressure receiving surface 128 and a pressure receiving surface 128.
Spoon formed with a land 136 having an opposing pressure receiving surface 132
2 and the spool 138 is brought into contact with the land 136.
And a spring 140 that urges in the middle right direction.
The pressure receiving surface 108 has a larger pressure receiving area than the pressure receiving surface 104,
The pressure receiving surface 120 is larger than the pressure receiving surface 110
The pressure receiving area is larger than the pressure receiving surface 116
And the pressure receiving surface 122, the pressure receiving surface 126, and the pressure receiving surface 1
28 and the pressure receiving surface 132 each have the same pressure receiving area.
You. An orifice 142 is interposed on the pressure receiving surface 102.
Orifice 146 between the pressure receiving surfaces 104 and 108
The oil passage 88 is interposed between the receiving surfaces 110 and 114 via the interposed oil passage 148.
Has an oil passage 152 in which an orifice 150 is interposed.
An oil passage 156 with an orifice 154 between
Oil passages 88 and 160 between oil passages 130 and 136 via an oil passage 158.
And the oil passage 164 communicated downstream of the orifice 162
And an oil passage 166 is provided between the land 130 and the land 124.
The oil passage 84 communicates with the oil passage 84 via the oil passage 84. Torque converter control valve 200 has pressure receiving surfaces 202 and 204
The same as the pressure receiving surface 204 facing the land 206 and the pressure receiving surface 204
A land 212 having a pressure receiving surface 208 having a pressure receiving area is formed.
The spool valve 214 and the land 212
2 and a spring 216 that urges it to the right in FIG.
The oil pressure of the oil passage 88 adjusted by the pressure adjusting valve 100 is
Via an oil passage 172 provided with a passage 160, an oil passage 168, and an orifice 170.
And acts on the pressure receiving surface 202 to balance the biasing force of the spring 216.
The oil pressure in oil passage 168 is adjusted to a predetermined pressure by a lance,
To the torque converter 12 via the road 168.
You. The oil discharged from the torque converter 12 is
It is supplied to each lubrication section of the transmission via 174. Manual valve 300
Has a spool 302 in which three positions R, N, P, and D can be selected.
The spool 302 has lands 304, 306, 308, 310 and the same spool
Is installed in the passenger compartment to set the
P position used for parking, R position for reverse,
The gear change between the N position and the first to fourth forward gears
D4 position, change between first gear to third gear
Speed D3 position, shift to third gear or higher
Shifting to two prohibited positions and the second or higher gear
A conventionally known cell (not shown) provided with a prohibited L position
Connection mechanically or electrically connected to the lever
Section. And the selector lever is operated
And one of D4, D3, 2, or L is selected
Then, the spool 302 is moved to the position D, and the oil passage 88 and the oil
The line 314 and the oil passage 316 communicating with each solenoid valve
It is communicated via the space between 304 and land 306
The oil passage 144 and the oil discharge passage 320 communicating with the discharge port 318
Space between land 308 and land 310, oil passage 322, land 30
4Communicated via the right hydraulic chamber 323,
Solenoid valve 400A, 2nd solenoid valve 400B, 3rd solenoid
Corresponding to the ON / OFF combination of the solenoid valve 400C and the fourth solenoid valve 400D.
The position of the selector lever and the operating state of the vehicle
Gears shown in Fig. 1
The selector lever to the P or N position
Once set, the spool 302 is selected to the NP position shown.
Oil passage 88 and oil passage 144 are connected to oil passage 324, land 308 and land 31.
Oil space 88 and oil passage 314 are connected to land 30 through the space between
Communicated via the space between 4 and land 306
With the orifice 326, the reverse clutch 3
The oil passage 328 and the oil discharge passage 320 connected to
Through the oil passage 322 and the hydraulic chamber 323 described above.
The oil passage 316 is also connected to the oil drain passage 320,
Achieve the neutral state and set the selector lever to the R position.
The spool 302 is selected at the R position and
And oil passages 314 and 328 are between land 304 and land 306.
Oil passage 144 and oil drain passage 320
Is the space between land 306 and land 308, oil passage 322, above
It communicates via the hydraulic chamber 323, and the oil passage 316 also communicates with the oil drain passage 320
And, as described later, the gear shift device
(Gear). The first solenoid valve 400A is provided by an electronic control unit (not shown).
A normally open 3-way valve that operates in response to an electrical signal.
The coil 402a, the valve body 404a, and a switch for urging the valve body 404a in the opening direction.
A spring 406a is provided, and the coil 402a is
In the magnetic state, the valve body 404a is connected to the oil discharge passage 320 and the orifice 4
08 is interposed and connected to the first fail-safe valve 600 described later.
And cut off the communication with the oil passage 410
Oil pressure in oil passage 316 or oil passage 328 via check valve 412
Is communicated with the oil passage 414 through which the coil 402a is guided.
In the magnetic state, the valve body 404a connects the oil passage 410 and the oil passage 414.
Communication between the oil passage 410 and the oil discharge passage 320.
It is configured to make it. The second solenoid valve 400B is always
Closed three-way valve with coil 402b, valve body 404b, and valve body inside
A spring 406b for biasing the 404b in the closing direction is provided.
When the coil 402b is not excited, the valve body 404b
Oil passage 316 and orifice 415
Cut off the communication with the oil passage 416 connected to the Rulf valve 700
At the same time, the oil passage 416 and the oil discharge passage 320
In the excited state of the oil 402b, the valve body 404b
Communication between the oil passage 416 and the oil passage 416
It is configured to communicate with the 316. The third and fourth solenoid valves 400C and 400D are connected to the first solenoid valve.
A normally open 3-way valve similar to the id valve 400A, with a coil inside
402c, 402d, valve body 404c, 404d, and valve body 404c, 404d in the opening direction
The biasing springs 406c and 406d are provided respectively.
When the coils 402c and 402d are not energized, the valve
Body 404c, 404d is interposed with oil drain 320 and orifices 418, 420
Re-drive clutch 30, overdrive clutch 2
The communication with oil passages 422 and 424 connected to
The oil passages 422 and 424 and the oil passage 316 communicate with each other.
In the excited state of 02c and 402d, the valve bodies 404c and 404d are discharged.
The oil passage 320 communicates with the oil passages 422 and 424, and the oil passage 4
22 and 424 are configured to cut off communication between oil passage 316
I have. The first to fourth solenoid valves 400A, 400B, 400C, 400D
The combination of “ON” (excitation) and “OFF” (non-excitation)
Is as shown in Table 2. "-" In the table is O
Indicates that either N or OFF is acceptable. The line pressure switching valve 500 adjusts the line pressure to a value corresponding to the speed.
For switching, orifice 502 is interposed and oil
It has a pressure receiving surface 504 and a pressure receiving surface 506 on which the hydraulic pressure of the passage 314 acts.
Facing the land 508 and the pressure receiving surface 506
Pressure receiving surface 510 and oil passage 512 having the same pressure receiving area as pressure surface 506
A land 516 having a pressure receiving surface 514 on which the hydraulic pressure acts is formed.
Spool valve 518 and the pressure receiving surface 514.
The spring 520 biases the valve 518 to the right in FIG.
The oil pressure is supplied to the oil passage 314, and the oil is supplied to the oil passage 512.
When no pressure is supplied, the pressure acting on the pressure receiving surface 504
Overcomes the biasing force of the spring 520 and the spool valve 518
Is displaced to the left in the drawing.
Communicates through the space between lands 508 and 510 and oil passage 51
2 and the oil passage 314, when hydraulic pressure is supplied, the pressure receiving surface 50
4 and the spring acting on the pressure receiving surface 514
If it is greater than the resultant force with the biasing force of
The spool valve 518 is moved to the left
But the pressure acting on the pressure receiving surface
Pressure acting on pressure receiving surface 504 due to resultant force with urging force of ring 520
Pressure acting on the pressure receiving surface 514 that overcomes
The pressure and the pressure acting on the pressure receiving surface 514.
Since the spool valve 518 is displaced rightward in the drawing, the oil passage 156 and the oil
The road 512 communicates with a hydraulic chamber on the left side of the land 516. What
The orifice 522,524 is interposed in the oil passage 512, and the oil passage 424
And the first fail-safe valve 600 to be described later.
And the second fail-safe valve 700. The first fail-safe valve 600 is connected to the oil passage 314 and
Pressure receiving surface 60 on which oil pressure of oil passage 604 in which chair 602 is interposed acts.
6 and a land 610 having a pressure receiving surface 608,
A pressure receiving surface 612 having a pressure receiving area larger than
The land 616 having the pressure surface 614 and the pressure reception surface facing the pressure reception surface 614
Pressure receiving surface 618 and pressure receiving surface with pressure receiving area smaller than surface 614
A land 622 having a pressure receiving surface 620 and a pressure receiving surface 62
A pressure receiving surface 624 and a pressure receiving surface 626 having the same pressure receiving area as 0
Facing the land 628 and the pressure receiving surface 626
The pressure receiving surface 630, which has a small pressure receiving area,
A land 634 having a pressure receiving surface 632 acting thereon.
A pool 636 is provided, and the hydraulic pressure of the oil passage 604 is simply applied to the pressure receiving surface 606,
Only the oil pressure of oil passage 410 acts on pressure receiving surfaces 614 and 618
In the case of, the spool 636 is at the left end position in FIG.
Held in the oil passage 410 and the low reverse brake 44
The oil passage 638 for supplying oil pressure is kept in communication.
In addition to the above condition, the hydraulic pressure is further supplied to the 2-4 brake 54.
Orifice 642 connected to oil passage 640 for supply
Oil passage 644 or oil passage 512 (under drive crack
(It communicates with the oil passage 424 for supplying oil pressure to the switch 28)
When hydraulic pressure is guided to at least one of the pressure receiving surfaces 626 or
The same hydraulic pressure acts on the pressure receiving surface 632, and the spool 636 moves to the right of the drawing.
The oil passage 638 is displaced between the land 622 and the land 628.
Communicates with the oil drain 320 through the space between
The brake 44 is configured to be released instantaneously.
The space between land 610 and land 616 is the Ex. Port
Is in communication with Here, the oil pressure is guided to the oil passage 410 on the pressure receiving surfaces 614 and 618.
The hydraulic pressure is guided to the oil passage 416 on the pressure receiving surfaces 626 and 630
Whether the pressure receiving surface 632 is guided to the oil passage 424
Function as detection means for detecting
Each pressure receiving surface is a switch for switching the position of the spool 636.
It acts as a step. 2nd failsafe valve 70
0 is a land 706 having a pressure receiving surface 702 and a pressure receiving surface 704,
Opposed to the surface 704 and has a larger pressure receiving area than the pressure receiving surface 704
712, a pressure receiving surface 71 having a pressure receiving surface 708 and a pressure receiving surface 710
0 and has a pressure receiving area smaller than the pressure receiving surface 710.
Land 718 having pressure surface 714 and pressure receiving surface 716,
A pressure receiving surface 720 facing and having the same pressure receiving area as the pressure receiving surface 716
Land 724 having a pressure receiving surface 722 and a pressure receiving surface 722.
A pressure receiving surface 726 having a pressure receiving area smaller than the pressure receiving surface
A spool 732 formed with a land 730 having a pressure surface 728
When hydraulic pressure is simply guided to oil passages 604 and 416,
Sometimes, oil passage 512 or orifice 734 is interposed and oil passage 4
Hydraulic pressure is guided to only one side of oil passage 736 communicating with 22
In this case, due to the difference in the area of the pressure receiving surface where
The pool 732 is held at the left end position in FIG.
Oil for supplying oil pressure to oil passage 416 and 2-4 brake 54
Road 640 passes through the space between land 718 and land 712
Communication is maintained, and hydraulic pressure is guided to oil passages 604 and 416
At the same time, hydraulic pressure is guided to both oil passage 512 and oil passage 736.
The spool 732 is displaced to the right in the drawing and the oil passage 640
Oil passage for drainage through the space between land 718 and land 724
Communicates with 320 and releases the above 2-4 brake 54 instantly
It is configured as follows. The hydraulic chamber on the right of land 706
Is connected to the Ex. Port. Here, the oil pressure is guided to the oil passage 416 on the pressure receiving surfaces 710 and 714.
Whether or not the pressure is applied to the pressure receiving surfaces 722 and 726 to the oil passage 422
Whether or not the oil pressure is guided to the oil passage 424 on the pressure receiving surface 728
Function as a means of detecting whether or not
The pressure receiving surfaces are switched to switch the position of the spool 732.
It acts as a means. The first and second hues
Ilsafe valves 600 and 700 achieve a certain forward gear.
If the solenoid valve malfunctions during operation, three or more
The transmission elements lock at the same time
To prevent the speed from changing to the 2nd, 3rd or 4th speed.
Forcibly shifting to the first gear to make the vehicle runable
It is. Next, the operation of the hydraulic control device will be described. The driver of the vehicle is located in the cabin of the vehicle, not shown.
Set the conventionally known selector lever to the P or N position.
Then, it is mechanically or electrically connected to the selector lever.
The spool 302 of the manually operated valve 300 is also attached to the selector lever.
It is set to the PN position in conjunction with it. And the engine
When started, the hydraulic pressure generated by the oil pump 86 goes to the oil passage 88
The oil pressure is discharged, and the oil pressure is
Acts on 104 and 108, as well as oil line 324 and manual valve 300
Space between land 308 and land 310, via oil passage 144
Acts on the pressure receiving surface 102 of the pressure regulating valve 100. Spool of pressure regulating valve 100
The pressure acting on each pressure receiving surface and the spring 140
Stable at a position where the biasing force of the
Of the hydraulic pressure led to the space between lands 130 and 136
Is discharged to the oil passages 164 and 166, and the hydraulic pressure in the oil passage 88 is
Is adjusted to the lowest predetermined pressure (referred to as the first line pressure).
It is. The oil pressure in the oil passages 88 and 164 is transmitted through the oil passage 160.
To the torque converter control valve 200
A predetermined pressure is supplied to the motor 12 via an oil passage 168. further,
The oil pressure of the oil passage 88 is controlled by the lands 304 and 30 of the manual valve 300.
6, the line pressure switching valve 500 via the oil passage 314
It is led to the rightmost hydraulic chamber and the oil passage 604. Guide to the hydraulic chamber
The applied hydraulic pressure acts on the pressure receiving surface 504, and the urging force of the spring 520
And the spool 518 is displaced to the leftmost position in FIG.
To make the oil passage 156 and the oil discharge passage communicate with each other.
The hydraulic pressure guided to the path 604 is the right end of the first failsafe valve 600
Land 712 and land 70 of the pressure receiving chamber and the fail-safe valve 700
6 and guided to the space between
Displace the spools 636 and 732 to the left end position in FIG.
The oil passage 410 and the oil passage 638, and the oil passage 416 and the oil passage 640 are in communication with each other.
To The first to fourth solenoid valves 400A, 400B, 400C, 400D
All are kept OFF (de-energized). Here, driving
When the user operates the selector lever to select the D4 position,
The valve 300 is set to the D position, and the land 310
Is shut off, and the oil passage 144 and the oil passage 322 communicate with each other.
The hydraulic pressure in the rightmost hydraulic chamber is drained through the oil passages 322 and 320.
Will be issued. The oil passage 88 further runs with the land 304 of the manual valve 300.
And the oil passage 316 through the space between the oil passage 306
The oil pressure of 316 and the land 112 of the pressure regulating valve 100
To the space between them. And spool 138
Are the forces acting on the pressure receiving surfaces 110 and 114 and the pressure receiving surfaces 104 and
Stable at a position where the biasing force of the spring 140 is balanced,
Part of the oil pressure in oil passage 158 is discharged from oil passages 164 and 166.
The oil pressure in the oil passage 88 should be relatively high (for example, 10 kg / c
m ^Two 2.) Adjust the pressure to a predetermined pressure (referred to as a second line pressure). Up
The hydraulic pressure of the oil passage 316 is equal to the second to fourth solenoid valves 400B and 400B.
C, 400D, and check valve 412, oil passage 414
It is also guided to the first solenoid valve 400A via the first solenoid valve 400A. The oil passage 314 is connected to the oil passage 8 in the same manner as in the case of the NP position.
8 and held in normal body. When the selector lever is set to the D4 position,
Low reverse brake 44 and underdry as shown
A first speed is achieved by engaging the clutch 30
As shown in Table 2 from an electronic control unit (not shown)
Deenergize the first to third solenoid valves 400A, 400B, and 400C
State and the fourth solenoid valve 400D is turned off from the non-excited state.
In the excited state, the first and third solenoid valves 400A and 400C
Open the oil passages 414 and 410, oil passages 316 and 422
Are output. The above oil
The hydraulic pressure guided to passage 410 is applied to the first failsafe valve 600
Space between the land 616 and the land 622,
-Led to the reverse brake 44 and led to the oil passage 422
The applied hydraulic pressure passes through the underdrive clutch 30 and oil passage 736.
Lands 724 and 730 of the second failsafe valve 700
Between the two engaging elements 44 and 30
Sudden engagement with the second line pressure of
Low reverse brake may cause a shock.
Immediately before the rake 44 is engaged, the first solenoid valve 400A is turned on.
The third solenoid immediately before the second drive clutch 30 is engaged.
First, each valve 400C is excited at a predetermined duty ratio.
Gradually reduce the duty ratio from
State, that is, the oil pressure in the oil passages 638 and 422 gradually rises.
By raising it, the above shock can be reduced.
Wear. Next, the vehicle starts running, and the throttle valve opening signal and the vehicle
The second speed is controlled by an electronic control unit (not shown) based on the speed signal and the like.
Table 1 shows that the upshift to the next gear is instructed.
2-4 brake 54 and underdrive clutch 30
To engage the first, second and fourth solenoid valves 400
A, 400B, and 400D are excited, and the third solenoid valve 400C is turned on.
A signal for de-energizing is output from the electronic control unit.
Is forced. The first solenoid valve 400A starts from the non-excited state.
Oil path 410 and oil drain path 320 communicate to switch to the excited state
The hydraulic pressure in the oil passage 410 is discharged and the low reverse brake 4
4 is released. The second solenoid valve 400B switches from the non-excited state to the excited state
Oil passages 316 and 416 communicate with each other, leading to oil passage 416
The applied hydraulic pressure is applied to the land 712 of the second
2-4 brake via oil passage 640
Guided to 54, the brake 54 is engaged, and the oil
The hydraulic pressure of 640 is supplied via the oil passage 644 to the first fail-safe valve.
Guided to the space between 600 land 628 and land 634
You. However, the hydraulic pressure acting between lands 616 and 622 was low.
Since it has been reduced, it is guided to the same space and acts on the pressure receiving surfaces 626 and 630
The resultant force of the hydraulic pressure to the right in the figure is the pressure receiving surface 6 of the land 610.
The urging force to the left in the figure due to the second line pressure acting on 06
And the spool 636 is on the left side of FIG.
Held in position. Note that the second solenoid valve 400B
In this case, if the excitation state is suddenly turned on, the 2-4 brake 54
May cause shock due to engagement with
Exciting the solenoid valve 400B gradually to gradually reduce the oil pressure in the oil passage 416
And finally raise the second line pressure
The shock can be reduced. Since the third solenoid valve 400C is kept in a non-excited state,
The oil passage 316 communicates with the oil passage 422 as in the case of the first speed.
Then, the underdrive clutch 30 is held in the engaged state. The fourth solenoid valve 400D is held in the excited state, and the oil passage 424 is closed.
Overdrive because it communicates with the oil passage 320 for discharge
The clutch 28 is kept in the released state. Next, the vehicle speed further increases, and the electronic control unit controls the second speed.
When an upshift to the third gear is instructed,
As shown in Table 1, overdrive clutch 30
First solenoid to engage drive clutch 28
With the valve 400A in an excited state, the second to fourth solenoid valves 400B, 4B
The signal for de-energizing 00C and 400D is controlled by the electronic control.
Output from the device. Since the first solenoid valve 400A is kept in the excited state,
Oil passage 410 communicates with oil drain passage 320 as in the case of the second gear.
doing. The second solenoid valve 400B switches from the excited state to the non-excited state
The oil passage 416 communicates with the oil passage 320 so that the 2-4 brake 54
To be released. Since the third solenoid valve 400C is kept in a non-excited state,
The oil passages 422 and 316 are kept in communication with each other, and
The clutch is maintained in the engaged state. The fourth solenoid valve 400D switches from the excited state to the non-excited state
So that oil passage 316 and oil passage 424 communicate with each other,
The hydraulic pressure is led to the overdrive clutch 28 and
The latch 28 is engaged. The oil pressure in the oil passage 424
The leftmost hydraulic chamber of the line pressure switching valve 500 through the oil passage 512,
The leftmost hydraulic chamber of the failsafe valve 600 and the second fail
It is also led to the leftmost hydraulic chamber of the safe valve 700. Above line pressure
The hydraulic pressure guided to the leftmost hydraulic chamber of the switching valve 500 is applied to the pressure receiving surface 514.
Hydraulic pressure acting on the pressure receiving surface 514 is larger than a certain value.
When it becomes tight, that is, oil supplied to the overdrive clutch 28
The pressure is at the end of engagement of the overdrive clutch 28,
When the oil pressure becomes higher than a predetermined value corresponding to
The hydraulic pressure acting on the surface 514 cooperates with the biasing force of the spring 520.
Works to overcome the hydraulic pressure acting on the pressure receiving surface 504 of the land 508
To displace the spool 518 to the right in the drawing.
And the oil passage 156. Guided from oil line 512 to oil line 156
The hydraulic pressure between the lands 118 and 124 of the pressure regulating valve 100
Since it is guided to the space and acts on the pressure receiving surfaces 116 and 120, the tuning pressure
The spool 138 of the valve 100 has pressure receiving surfaces 116 and 120, pressure receiving surfaces 110 and 114, and
Acting on the pressure and pressure receiving surfaces 104 and 108 and the biasing force of the spring 140
Is stable at a position where it balances
Is discharged from the oil passages 164 and 166, and the oil in the oil passage 88 is discharged.
Pressure lower than the second line pressure and higher than the first line pressure
To a predetermined pressure (referred to as a third line pressure). Guided to the leftmost hydraulic chamber of the first failsafe valve 600
The hydraulic pressure acts on the pressure receiving surface 632 of the land 634,
To the rightmost hydraulic chamber of the valve 600 via the
Hydraulic pressure cannot be overcome due to the area difference.
Therefore, the spool 636 is held at the left position in FIG.
You. Hydraulic pressure guided to the leftmost hydraulic chamber of the second fail-safe valve 700
Acts on the pressure receiving surface 728 of the land 730, and
722, 72
The spool 732 moves to the right according to the hydraulic pressure acting on 6.
Energize, but land 706 and land 712 via oil passage 604
Between the pressure receiving surfaces 704 and 708
The leftward biasing force by the
2 is held at the left position in FIG. Further increase in vehicle speed
The electronic control unit (not shown) determines whether the transmission is in the third gear.
When the shift from the first gear to the fourth gear is instructed,
2-4 brake 54 and overdrive clutch 28
The first to third solenoid valves 400A, 400B,
400C is energized and the fourth solenoid valve 400D is de-energized.
A signal for the output is output from the electronic control unit. 1st sole
Since the solenoid valve 400A is kept in the excited state, the third speed change
The oil passage 410 communicates with the oil passage 320 as in the case of the speed stage. The second solenoid valve 400B switches from the non-excited state to the excited state
Therefore, the oil passages 316 and 416 communicate with each other, and the oil in the oil passage 416
The pressure is the lands 712 and 718 of the second failsafe valve 700
2-4 brake 54 through the space between the
And the brake 54 is engaged, and at the same time, the oil passage 64
Lands 628 land 6 of the first fail-safe valve 600 via 4
34 and acts on the pressure receiving surfaces 626 and 630. The third solenoid valve 400C switches from the non-excited state to the excited state
The oil passage 422 is disconnected from the oil passage 316,
320 and the oil pressure
The dull drive clutch 30 is released. The fourth solenoid valve 400D is held in a non-excited state and the oil passage 424
Is kept in communication with oil passage 316,
The clutch 28 is kept engaged and the line pressure switching valve 500
(The oil pressure in oil passage 88 is maintained at the third line pressure)
), The leftmost hydraulic chamber of the first failsafe valve 600, and the
Hydraulic pressure continues to the leftmost hydraulic chamber of 2-fail safe valve 700
Be guided. In a state where the fourth speed is achieved, the first feedback is not applied.
Hydraulic chamber at the left end of Ilsafe valve 600, land 628 and land 63
Hydraulic pressure is guided to the space between 4 and the same hydraulic pressure acts
Through the pressure receiving surfaces 632, 626, and 630 and the oil passage 604.
The pressure receiving surface 606 on which the hydraulic pressure guided to the rightmost hydraulic chamber
Oil acting on the pressure receiving surface 632, 626, 630 due to pressure area
The pressure overcomes the oil pressure acting on the pressure receiving surface 606,
The spool 636 is displaced to the right in FIG. 2 and the oil passage 638 drains oil.
It is configured to communicate with the road 320. Up from the first gear to the fourth gear
The shift operation has been described.
The operation of downshifting up to the first gear is simply performed as described above.
Since the shift is performed in exactly the reverse procedure,
Description is omitted. Also, make sure that the selector lever is set to the D3, 2, or L position.
If it is, the same position will be
Only the corresponding shift range is determined and the manual valve 300
Is kept in the D position and there is no change in the hydraulic circuit.
Description is omitted. Next, the driver of the vehicle
Is set to the R position, the spool 302 of the manual valve 300 is also set to the R position.
Oil path 144 is between land 306 and land 308
Through the space, the oil passage 322, and the hydraulic chamber 323 at the right end of the manual valve 300.
To the oil drain 320. In addition, the oil passage 316
It communicates with the oil drain 320 through the chamber 323. Therefore, pressure regulating valve 10
To run to zero, run through land 106 of tuning pressure valve 100 via oil line 148.
Oil that is guided into the space between the pressure receiving surface 112 and the pressure receiving surfaces 104 and 108
Since only pressure is guided, spool 138 acts on the pressure receiving surface
Hydraulic pressure and the biasing force of the spring 140 are balanced
Position and the oil pressure in oil passage 88 is the highest (for example, 16 kg / c
m ^Two ) The pressure is adjusted to a predetermined pressure (referred to as a fourth line pressure).
The oil passage 88 is connected to the lands 304 and 306 of the manual valve 300.
Between the oil passages 314 and 328 through the space between
Hydraulic pressure directed to road 314 is used when forward gear is achieved
Similarly to the first and the second through the line pressure switching valve 500 and the oil passage 604
And the second fail-safe valve 600, 700
The hydraulic pressure guided to 328 is guided to the reverse clutch 32 and
Engage clutch 32 and go to check valve 412
Is also guided. When the selector lever is set to the R position,
As shown in Table 2, the first solenoid valve 400A is in the non-excited state.
Therefore, the hydraulic pressure guided to the check valve 412 is
4, oil passage 410, run with land 616 of first fail-safe valve 600
To the low river via the space between
It is led to the brake 44, and the brake 44 is engaged.
The reverse gear is achieved. Here, in the hydraulic control device shown in FIG.
At the lowest first line pressure, the first speed and the second speed
Relatively high second gear when a high gear is achieved.
Third gear and fourth gear are achieved for the in-pressure.
When the reverse gear reaches a relatively low third line pressure
To the highest fourth line pressure when
It is configured to switch the hydraulic pressure,
Gin torque is not transmitted to the output shaft of the transmission
The engine drives the pump 86 when in neutral
Power loss and the relatively large torque
In the transmitted first and second speeds, the line pressure is
Relatively high, the engaging force of the engaging element is relatively large,
In the third and fourth gears, the transmission torque
Because the pressure is relatively small, set the line pressure relatively low
To reduce the power loss for driving the
The line pressure is highest at the reverse
This is for preventing the engagement element from slipping. Also, the first to fourth solenoid valves 400A, 400B, 400C, 400D
Engagement element corresponding to each solenoid valve by duty control
By controlling the hydraulic pressure supplied to and discharged from the
A smooth shift can be achieved. Next, when a failure occurs in the electronic control unit or solenoid valve,
First and second fail-safes when the solenoid valve malfunctions
The operation of the leaf valves 600 and 700 will be described. The first to third solenoid valves 400A, 400B, 400C are not excited,
4th solenoid valve 400D is excited to reach 1st speed
In the condition to be established, the second solenoid valve 400B
When actuated and excited, hydraulic 316 and oil passage 416 communicate.
State, and the hydraulic pressure guided to the oil passage 416 is
The space between land 712 and land 718 of LeSafe valve 700
The brake is guided to the 2-4 brake 54 through the
However, at the same time, the oil passage 640 and the oil passage 644
Between the land 628 and the land 634 of 1 failsafe valve 600
To the space between the pressure receiving surfaces 614 and 618
Pressure surface 614,61
The rightward biasing force by hydraulic pressure acting on 8
To the left by hydraulic pressure acting on the pressure receiving surface 606
Overcoming the biasing force, the position of spool 636 moves to the right in Fig. 2.
Is switched to Therefore, oil passage 638 is in communication with oil drain passage 320.
Low reverse brake 44 is released,
-4 Only brake 54 and underdrive clutch 30 are engaged
State, and the second speed is achieved. In the state where the first gear is to be achieved, the fourth solenoid
When the id valve 400D malfunctions and is demagnetized, the oil passages 316 and 4
And the hydraulic pressure is guided to the overdrive clutch.
To engage the clutch 28 at the same time
And the first fail-safe valve 600 and the second fail-safe
Guided to the leftmost hydraulic chamber of valve 700, the first fail-safe valve 600
Urging force acting on the pressure receiving surface 632 and the pressure receiving surfaces 614 and 618
Switches the spool 636 to the right in the drawing as above
Can be At this time, the splice of the second fail-safe valve 700
732 does not switch to the discharge position on the right in the figure
However, when the second solenoid valve 400B is demagnetized and the oil passage 416
2-4 brake 54 is engaged because hydraulic pressure is not supplied to
I will not do it. Therefore, go to low reverse brake 44
Since the communicating oil passage 638 is communicated with the oil drain passage 320,
The reverse brake 44 is released and the underdrive crack is released.
H and only the overdrive clutch 28 are engaged.
Thus, the third speed is achieved. Further, in the state where the first gear is to be achieved, the second
The solenoid valve 400B is excited and the fourth solenoid valve 400D is excited.
Otherwise, only the fourth solenoid valve 400D malfunctioned
In addition to the state, the second solenoid valve 400B malfunctions and the oil
Since the passage 316 and the oil passage 416 communicate with each other, each solenoid valve
All oil passages 410, 41 communicating with each engagement element 28, 30, 44, 54
6,422,424. Then, the second Hue
Pressure receiving surface 728 of ilsafe valve 700, between pressure receiving surfaces 722 and 726 and pressure receiving
Hydraulic pressure acts on everything between surfaces 710 and 714 to move spool 732 to the right.
The spool 732 to the right position in the figure.
The oil pressure of the oil passage 640 is discharged through the oil drain passage 320
Thus, the released state of the 2-4 brake 54 is maintained. In addition,
1 Fail safe valve 600 has its pressure receiving surface 632 and pressure receiving surface
Hydraulic pressure acts between 614 and 618.
Left side in the figure due to the hydraulic pressure acting on the pressure receiving surface 606
Direction is greater than the biasing force in the direction
The oil passage 638 is communicated with the oil drain passage 320 and
Reverse brake 44 is held in the released state. Therefore,
Underdrive clutch 30 and overdrive clutch
Only 28 is engaged, and the third speed is achieved. Next, the first, second and fourth solenoid valves 400A, 400B, 400D
The third solenoid valve 400C is excited and the third solenoid valve 400C is not excited.
When the second gear is to be achieved, the first solenoid
When the id valve 400A is no longer excited, the oil
Hydraulic pressure is guided between the pressure receiving surfaces 626 and 630 of 1 failsafe valve.
The oil passages 316 and 410 communicate with each other on the
Pressure is introduced into the space between land 616 and land 622
The urging force of these oil pressures to the right in the figure
Greater than the leftward bias in the figure due to the hydraulic pressure acting on 606
The position of the spool 636 is switched to the right in the drawing.
You. Accordingly, the communication between the oil passage 410 and the oil passage 638 is cut off,
Since the road 638 communicates with the oil passage 320, the 2-4 brake 54 and the
Only the second drive clutch 30 is held in the engaged state.
The second gear is maintained. Also, the second gear is reached
The fourth solenoid valve 400D malfunctions when it should be
When demagnetized, the oil passages 316 and 424 communicate with each other,
Hydraulic pressure is guided to the overdrive clutch 28 and
And the first and second
It is led to the leftmost hydraulic chamber of the two fail-safe valves 600 and 700.
Then, the pressure receiving surfaces 728 and 7 of the second fail-safe valve 700
Since hydraulic pressure acts between 22,726 and pressure receiving surfaces 710,714,
The spool 732 is switched to the right position in the figure by the urging force.
Oil passage 640 communicates with the oil drain passage 320, and the 2-4 brake 54
To be released. On the other hand, the pressure receiving surface 6 of the first failsafe valve 600
Hydraulic pressure is also guided through the oil path 512 to the
By switching the fail-safe valve 700, the pressure between the pressure receiving surfaces 626 and 630
The hydraulic pressure is not guided, and the first solenoid valve 400A is excited.
Hydraulic pressure is not guided between the pressure receiving surfaces 614 and 618
The spool 636 is held at the left position in the figure.
・ No hydraulic pressure is supplied to the reverse brake 44,
The key keeps the released state. Therefore, the underdrive class
Switch 30 and overdrive clutch 28 are engaged.
The third speed is achieved. In addition, the first and second gears are to be achieved and
And 4th solenoid valve 400A, 400D were not excited
In this case, the spool 636 of the first failsafe valve 600 and the second
Drawing of the position of the spool 732 of the fail-safe valve 700
Switch to the right, connect to low reverse brake 44
And an oil passage 640 communicating with the 2-4 brake 54.
Is communicated to the oil passage 320, and the brakes 44 and 54 are released.
Condition, underdrive clutch 30, overdrive clutch
The hook 28 is engaged, and the third speed is achieved. Next, the first solenoid valve 400A is excited, and the second to fourth solenoid valves are activated.
Third speed shift without solenoid valves 400B, 400C, 400D being excited
When the step is to be achieved, the first solenoid valve 40
When 0A is no longer excited, oil passages 316 and 410 communicate.
And the oil pressure in the oil passage 410
Guided to the space between de 616 and land 622. At this time,
Hydraulic pressure is also guided to the pressure receiving surface 632 via the oil passage 512
The position of the spool 636 in relation to the pressure receiving area with the pressure receiving surface 606
Switches to the right in the drawing, and oil passage 638 communicates with oil drain passage 320
The hydraulic pressure is not supplied to the brake 44 and the low reverse brake
Rake 44, 2-4 brake 54 released, underdrive
Clutch 30 and overdrive clutch 28 are engaged
And the third speed is maintained. In the state where the third gear is to be achieved, the second solenoid
When the solenoid valve 400B is excited, the oil passages 316 and 416 are connected.
Through the land 712 of the second fail-safe valve 700
Guide 718 to the space between them. At this time,
Hydraulic pressure is also supplied between the surface 728 and the pressure receiving surfaces 722 and 726.
Then, in the same manner as above, the position of the spool 732 is turned to the right in the drawing.
In other words, the oil passage 640 communicating with the 2-4 brake 54 is
The hydraulic pressure is not supplied to the brake 54,
Similarly, the third speed is maintained. Further, in the state where the third gear is to be achieved, the first
The solenoid valve 400A is demagnetized, and the second solenoid valve 400B is energized.
If it is magnetized, the first failsafe valve 600
636 with the spool 732 of the second failsafe valve 700
The positions are switched to the right in the drawing, and oil passages 638 and 640
Communicates with the oil passage 320 for discharge, and hydraulic pressure is supplied to the brakes 44 and 45.
Is not supplied, and the third speed is maintained. Next, the first to third solenoid valves 400A, 400B, 400C are energized.
And the fourth speed shift without the fourth solenoid valve 400D being excited.
The first solenoid valve 400 is energized with the stage to be achieved.
When it is no longer magnetized, the oil passages 316 and 410 become in communication.
However, at the fourth speed, the first fail-safe valve 600
The position of the spool 636 is between the pressure receiving surface 632 and the pressure receiving surfaces 626 and 630.
Switch to the right side of the drawing in advance by operating hydraulic pressure
The hydraulic pressure in the oil passage 410 is low and reverse
It is not supplied to the key 44, and the 2-4 brake 54 and the
Only the ball drive clutch 28 is maintained in the engaged state.
Thus, the fourth speed is maintained. In addition, in the state where the fourth gear is to be achieved, the third solenoid
When the solenoid valve 400C is demagnetized, the oil passages 316 and 422
And the hydraulic pressure is guided to the underdrive clutch 30.
The clutch 30 is engaged, and the oil
Lands 724 and 730 of the second failsafe valve 700
Guided to the space between Therefore, the second fail safe
Between the pressure receiving surfaces 722 and 726 of the valve 700, between the pressure receiving surfaces 728 and 710 and 714
Hydraulic pressure acts on all of the
Switching to the right side of the drawing, the oil passage 640 is connected to the oil drain passage 320
2-4 brake 54 is released and the underdrive
H and only the overdrive clutch 28 are engaged.
Thus, the third speed is achieved. Further, in a state where the fourth gear is to be achieved,
When the third solenoid valves 400A and 400C are demagnetized,
The oil passages 410 and 422 communicate with the oil passage 316.
The position of the spool 636 of the Ilsafe valve 600 is already on the right side of the drawing.
And the second fail-safe valve 700
Spool valve 732 also communicates with underdrive clutch 30
When oil pressure is supplied to the oil passage 422,
As a result, the 2-4 brake 54 is released, and the underdry
Only the clutch 30 and the overdrive clutch 28 are engaged
State, and the third speed is achieved. In the above embodiment, the first fail-safe valve 600 and the second
Equipped with a fail-safe valve 700, an electronic control unit,
Three or more engaging elements are simultaneously activated due to solenoid valve failure
When it is about to engage, the remaining two engaging elements are left and other engaging elements are required.
Elements are configured to be released, so
The engaging elements are simultaneously engaged and the transmission mechanism is locked,
Both wheels are suddenly fixed, or it is impossible to run at all
This has the effect of preventing the occurrence of such a phenomenon. Also, in the configuration of the above embodiment, the software is
Since solenoid valves are provided, each solenoid valve must be
Hydraulic pressure supplied to the engagement element by controlling and discharge
It is possible to control the shifting hydraulic pressure with high accuracy, and
The shock can be reduced. In this embodiment, the first to fourth solenoid valves are used.
As shown in FIG. 2, the ball valve type three-way solenoid valve is
Used, and the total number of spool valves in the hydraulic control unit
Is smaller than that of the conventional automatic transmission.
Minimize the probability of sticking of valves and spool valves
Can be. Further, in this embodiment, the manual valve 300 is in the NP position.
When set, the first line pressure is also
Because the pressure is regulated. Engine in neutral condition
The oil pressure in the oil passage 88 is higher than necessary even if the rotation speed of
In addition, there is an effect that generation of abnormal noise can be prevented. Further, in this embodiment, a line pressure switching valve 500 is provided.
When the first and second gears are achieved,
Is regulated to a relatively high second line pressure, and
When the fourth gear is attained, the relatively low third gear
Is transmitted to the line pressure of the
The pump 86 can be driven according to the torque.
Minimizing loss of engine power to operate
This has the effect that it can be performed. In the above embodiment, the first fail-safe valve 600 is used.
Is the first solenoid valve 400A and low reverse brake 44
And the second fail-safe valve 700
The second solenoid valve 400B communicates with the 2-4 brake 54
The first fail-safe valve was installed in each oil passage.
The interposition positions of 600 and the second fail-safe valve 700 are limited to the above.
It is not specified that simultaneous engagement of three or more engagement elements
If the position is to be prevented, the first fail-safe valve 60
0, the first solenoid valve 400A and low reverse brake 4
, The second solenoid valve 400B and the 2-4 valve
An oil passage communicating with the rake 54, or a fourth solenoid valve
Oil passage connecting 400D and overdrive clutch 28
The second fail-safe valve 700
Is connected to the second solenoid valve 400B and the 2-4 brake 54.
Oil passage, 3rd solenoid valve 400C and under drive
An oil passage communicating with the latch 30, or a fourth solenoid valve
Oil passage connecting 400D and overdrive clutch 28
The first fail-safe valve 600 is interposed in one of the oil passages.
Even if it is interposed in an oil passage that is not installed, the effect is almost the same as in this embodiment.
Play a fruit. Further, in the above embodiment, the first and second switching valves are used as the first and second switching valves.
Because the first and second failsafe valves are spool valves
In addition, hydraulic pressure is applied to each oil passage communicating the solenoid valve and the engagement element.
Detecting means for detecting whether or not
Pressure receiving surface of the spool valve as switching means for switching the spool valve
Pressure sensors as detection means in each of the above oil passages
, And according to the output of the sensor, for example, an electromagnetic switching valve, etc.
To switch the fail-safe valve consisting of
Even if this is achieved, substantially the same effects as in the present embodiment can be obtained. [Effect] According to the configuration of the present invention, the hydraulic pressure supplied to the high-speed engagement element
When the hydraulic pressure becomes high corresponding to the end of engagement of the high-speed engagement element,
Signal hydraulic pressure is supplied to the
Therefore, the engaging force of the above-mentioned engaging element corresponds to the speed.
And transmitted through the engagement element.
Oil during high speed gear with relatively small torque
The drive loss of the pump can be reduced and
The resultant force control is easy, so the shift shock can be reduced.
This has the effect.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a power train diagram of an automatic transmission for a vehicle to which one embodiment of the present invention is applied, and FIG. 2 is a hydraulic circuit diagram showing a configuration of one embodiment of the present invention. . 28: Overdrive clutch (third engagement element), 30: Underdrive clutch (fourth engagement element), 44: Low reverse brake (first engagement element), 54: 2-4 brake (Second engagement element), 86 pump 400A first solenoid valve (first shift device) 400B second solenoid valve (second shift device) 400C third solenoid valve (second shift device) 4D shift device) 400D… 4th solenoid valve (third shift device) 614,618 …… Pressure receiving surface (first detection means), 626,630,710,714 …… Pressure receiving surface (second detection means), 632,728 …… Pressure receiving surface (Third detecting means), 722,726 ... pressure receiving surface (fourth detecting means), 600 ... first fail-safe valve 600 (first switching valve), 636 ... spool (first switching means), 700 ... Second fail-safe valve (second switching valve), 732... Spool (second switching means)

Continuation of front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F16H 61/00

Claims (1)

(57) [Claims] In a vehicle automatic transmission having a plurality of engagement elements including a high-speed engagement element that achieves a relatively high speed,
A regulator valve for reducing the hydraulic pressure supplied to the high-speed engagement element when the signal hydraulic pressure is supplied, a supply position enabling the signal hydraulic pressure to be supplied to the regulator valve, and the signal hydraulic pressure supplied to the regulator valve A switching valve that can be switched to a discharge position for discharging the high-speed engagement element. When the supply oil pressure to the high-speed engagement element becomes high oil pressure corresponding to the end of engagement of the high-speed engagement element, the switching valve A hydraulic control device for an automatic transmission for a vehicle, wherein the hydraulic control device is configured to be switchable to the supply position. 2. The switching valve is a spool valve having a land, and a pressure receiving portion for urging the switching valve toward a supply position when the supply hydraulic pressure acts on the land is formed on the land. 2. The hydraulic control device for a vehicle automatic transmission according to claim 1. 3. 2. The hydraulic control device for an automatic transmission for a vehicle according to claim 1, wherein the signal hydraulic pressure is a hydraulic pressure supplied to the high-speed engagement element.