JPH063244Y2 - Electrically operated clutch pressure control valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an electrically operated control valve for controlling clutch pressure of a transmission.

[Conventional technology]

A transmission that shifts gears by selectively turning on and off a plurality of clutches includes a control valve for supplying pressure oil to each clutch.

For example, there is known an electrically operated control valve that slides a spool by a solenoid to supply pressure oil to a clutch or discharge pressure oil from the clutch to a drain.

On the other hand, when supplying pressure oil to the clutch, if the clutch pressure rises sharply, power is rapidly transmitted and a gear shift shock occurs. Therefore, the clutch pressure is gradually increased to prevent gear shift shock. There is a need.

Therefore, the present applicant has previously provided an electronically actuated control valve capable of supplying pressure oil to the clutch so that the pressure of the clutch gradually increases and discharging the pressure oil of the clutch to the drain for each clutch. Applied for the clutch pressure control device for the transmissions provided in each.

According to the clutch pressure control device for this transmission, each control valve itself has a function of gradually increasing the clutch pressure, and since it can be switched by an electric signal, the control lever and the control valve are linked by a link like a mechanical control valve. Since the structure does not have to be provided, the structure can be simplified and the degree of freedom in design is increased.

[Problems to be solved by the invention]

With such an electronically actuated control valve, if the solenoid or controller fails, the control valve cannot be switched. Therefore, a clutch pressure control device for a transmission in which such an electronically actuated control valve is provided for each clutch is provided. Therefore, if the solenoid or the controller fails, the transmission may not be able to shift to the power transmission state, and the vehicle cannot travel to an arbitrary position such as a repair place.

Therefore, an object of the present invention is to provide an electrically operated clutch pressure control valve that can be manually switched even if a solenoid or controller fails.

[Means and Actions for Solving Problems]

With the thrust of the proportional solenoid and the pressure on the outlet port side, the spool is connected to the position where the inlet port side communicates with the outlet port side, the position where the inlet port side communicates with the outlet port side, and the position where the outlet port side communicates with the drain side. A spool that is slid on and moved by manual operation between a position that directly communicates the inlet port side and the outlet port side and a position that directly communicates the outlet port side and the drain side is provided, and this spool is operated for delivery. It is possible to supply the pressure oil to the outlet port side and to discharge the pressure oil from the outlet port side to the drain by moving with.

〔Example〕

As shown in FIG. 2, the transmission A includes a forward clutch 1, a reverse clutch 2, a first speed clutch 3, a second speed clutch 4, a third speed clutch 5 and a fourth speed clutch 6, and supplies pressure oil to each clutch. Then, the speed is changed by turning it on and off, and the pressure oil of the pump P is supplied to each clutch via an electrically operated control valve 7 having a gradually increasing function. An electric signal is output from the controller 8 so as to be switched.

The control valve 7 is constructed as shown in FIG.

That is, the valve body 10 has first, second and third valve holes 11,
12 and 13 are perforated, and an inlet port 14, a first outlet port 15, a drain port 16 and a second outlet port 17 are formed on the first valve hole 11 side.
Is the first oil hole 18, the second oil hole 19 is the second and third valve holes 12,
13 and the drain port 16 has 3rd and 4th oil holes 2
The first outlet port 15 opens to the first valve hole 11 and the second outlet port 17 has the large diameter of the third valve hole 13 while the second and third valve holes 12 and 13 open at 0 and 21. It opens to the portion 13a.

An emergency first spool 22 is fitted into the first valve hole 11, and the first spool 22 is slidable left and right by a first plug 23 or a second plug 24 screwed into both ends of the first valve hole 11. The second spool 25 for pressure control is fitted into the second valve hole 12, and the second spool 25 is moved.
Is slid toward the position communicating the first oil hole 18 with the fourth oil hole 21 by the thrust of the proportional solenoid 26, and the third oil hole is generated by the pressure oil force in the pressure receiving chamber 29 of the spring 27 and the load piston 28. 20 and the fourth oil hole 21 are slid toward a position communicating with each other, and the pressure receiving chamber 29 has a shaft hole 30 and a port 31.
And communicates with the fourth oil hole 21.

A third spool 32 for flow rate detection is fitted into the third valve hole 13, and the third spool 32 has a small diameter flange 33 that connects the second oil hole 19 and the fourth oil hole 21, and a large diameter. A flange 34 is provided and is urged to the left and right by a spring 35 and a spring 36. A spring receiver 37 of the spring 35 is an insulating plate, and a detection pin 38 is provided on the spring receiver 37, and the detection pin 38 has a resistance R. _The large-diameter flange 34 is connected to a point a between the resistor _{1 and the} resistor R _2, and an orifice 39 is bored in the large-diameter flange 34.

Next, the operation will be described.

When a minute current is supplied to the proportional solenoid 26 from the state shown in FIG. 1, the thrust of the second spool 25 slides leftward against the spring 27, and the first constricted portion 25a causes the first oil hole 18 to move.
And the fourth oil hole 21 are slightly communicated with each other, the pressure oil from the inlet port 14 flows out from the orifice 39 to the second outlet port 17 and is supplied to the clutch.

At this time, since a differential pressure is generated before and after the orifice 39, the third spool 32 slides to the left and the detection pin 38 and the third spool 32 are separated from each other.

As a result, the potential at the point a has a voltage value obtained by dividing the voltage V by the resistors R ₁ and R ₂ .

Then, when the pressure oil is filled in the clutch and the filling is completed, the oil flow disappears, so that no pressure difference is generated before and after the orifice 39. Therefore, the pressure receiving area A ₁ of the small diameter flange 33 and the one side pressure receiving surface of the large diameter flange 34 are received. Area A ₂ and area difference between other side pressure receiving area A ₃ (A ₃ + A ₁ > A ₂ ) and spring 36
The third spool 32 slides to the right depending on how
The spool 32 contacts the detection pin 28, and the potential at the point a becomes zero.

The controller 8 is fed back that the potential at the point a has become zero, and the current supplied to the proportional solenoid 26 is gradually increased.

As a result, the thrust increases and the force that pushes the second spool 25 to the left increases, and the pressure of the second outlet port 17 is supplied to the pressure receiving chamber 29 of the load piston 28 and the second spool 2
The pressure in the second outlet port 17 gradually increases because it becomes larger than the force for pushing 5 to the right.

That is, when the force that pushes the second piston 25 to the right due to the pressure in the pressure receiving chamber 29 becomes larger than the thrust of the proportional solenoid 26, the second spool 25 moves to the right and the first oil hole 1
8. Although the fourth oil hole 21 is closed, the thrust of the proportional solenoid 26 gradually increases, so the pressure at the second outlet port 17, that is, the clutch pressure gradually increases.

If the above electrically operated control valve is used, the proportional solenoid 2
6, due to some failure such as a failure of the controller 8, the second spool 25 has the first oil hole 18 and the fourth oil hole 21 shown in FIG.
May not be able to move because it is fixed at a position that shuts off the oil or at a position that connects the first oil hole 18 and the fourth oil hole 21 and cannot supply pressure oil to the clutch or discharge pressure oil from the clutch. Will end up.

For example, the second spool 25 may be the first oil hole 18 and the fourth oil hole 2
When it is fixed at the position where 1 communicates, the pressure oil of the clutch cannot be discharged to turn off the clutch. In this case, the second plug 24 is loosened and the first plug 23 is tightened to tighten the first spool 22. Slide to the right.

Thus, the drain port 16 and the first outlet port 15 communicate with each other at the first constricted portion 22a of the first spool 22, and the first and second outlet ports 15 and 17 communicate with each other.
The pressure oil of the clutch can be discharged to the drain by connecting the second outlet port 17 to the drain.

Further, the second spool 25 has the first oil hole 18 and the fourth oil hole 21.
If the clutch is fixed at the position where it disengages, pressure oil cannot be supplied to the clutch, so in this case, the first clutch plug 2
3 and loosen the second plug 24 to tighten the first spool 22
Slide to the left.

As a result, the inlet port 14 and the first outlet port 15 communicate with each other at the second constricted portion 22b of the first spool 22, the pressure oil of the inlet port 14 is directly supplied to the clutch from the first outlet port 15, and the clutch is turned on. Becomes

The inlet port 14 and the second outlet port 17 may be disconnected by the second spool 32 without providing the third spool 32.

[Effect of device]

An electric signal to the proportional solenoid 26 can be used to gradually supply pressure oil on the inlet port side to the outlet port side, and by manually sliding the spool, the inlet port side can be directly communicated with the outlet port side, or the outlet port side can be directly connected. The port side can be directly connected to the drain side.

Therefore, if the spool cannot be moved due to some malfunction even though it is an electrically operated control valve, the spool is manually slid to discharge the pressure oil on the outlet port side, or the pressure oil on the inlet port side is discharged. Can be supplied to the outlet port side to turn the clutch off or on.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a sectional view of a control valve, and FIG. 2 is a circuit diagram. 10 is a valve body, 22 is a first spool, 25 is a second spool, and 32 is a third spool.

Claims (1)

[Scope of utility model registration request] 1. A spool which connects between the inlet port side and the outlet port side is fitted into the valve body 10, and the spool is slid by a proportional solenoid 26 toward a first position where the inlet port side communicates with the outlet port side. While moving, it slides toward a second position that shuts off the outlet port side and the inlet port side with the pressure on the outlet port side and communicates the outlet port side with the drain side.
The valve body 10 is provided with a spool that is manually moved between a position where the inlet port side and the outlet port side are in direct communication and a position where the outlet port side is in direct communication with the drain side. Actuated clutch pressure control valve.