JPH01255774A - Electric fluid converting device - Google Patents

Abstract

PURPOSE:To enable fluid supply in high pressure and high flow rate as raising responsibility by operating a control valve with signal fluid pressure controlling by an electric acturator. CONSTITUTION:An orifice 5 is provided in a signal fluid passage 2, an outlet of this passage 2 is made in a nozzle hole 4 and a pressure fetching port 6 is provided between the orifice 5 and the nozzle hole 4. The nozzle hole 4 is opened and closed with a working piece 7 of an electric actuator 8. Again, a control valve 12 operating in opening and closing on movement of a valve body 14 due to pressure in a pressure chamber 16 is provided in a control fluid passage 9. Because the pressure chamber 16 is communicated to the pressure fetching port 6, pressure in the pressure chamber 16 is raised when the nozzle hole 4 is closed by the working piece 7 of the electric actuator 8 with electric signal, and thereby the control valve 12 is opened.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an electrofluidic conversion device that controls fluid by electrical signals.

<Prior Art> The present inventor has invented an electro-fluid converter that controls the pressure of a fluid using an electrical signal.

As disclosed in Japanese Patent Application Laid-Open No. 62-37502, this electro-hydraulic converter has a throttle provided in the middle of a fluid passage, and an outlet of the fluid passage formed as a nozzle. A pressure outlet is provided between the ports, and an electric actuator whose actuating piece moves in response to an electric signal is provided at a position where the actuating piece crosses the spout of the fluid passage to open and close. The configuration is such that the pressure at the pressure outlet of the fluid passage is controlled by opening and closing the spout of the fluid passage.

<Problem to be solved by the invention> However, in the above-mentioned conventional electro-hydraulic converter,
When the flow rate of the fluid passage controlled by the actuating piece of the electric actuator is increased, the time from when an electric signal is input to the electric actuator until the pressure taken out from the fluid passage (1) is controlled becomes longer, resulting in a decrease in responsiveness. Deteriorate.

In order not to deteriorate responsiveness, there is an upper limit to the flow rate of the fluid ejected from the nozzle of the fluid passage, and therefore to the pressure of the fluid supplied to the fluid passage. Further, the pressure at the pressure outlet of the fluid passage is limited to a pressure equal to or lower than the pressure of the fluid supplied to the fluid passage.

Therefore, the variable range of the pressure at the pressure outlet of the fluid passage is narrow, and the range of fluid pressure controlled by the electrical signal is narrow.

An object of the present invention is to solve the conventional problems as described above.

Means for Solving the Problems> The present invention provides a conventional electro-fluid converter with a control valve that is opened and closed by the pressure at the pressure outlet of the fluid passage, and controls the opening and closing of the fluid by this control valve. be.

That is, the present invention provides a constriction between the inlet and the outlet of the signal fluid passage, forms the outlet of the signal fluid passage as a spout, and provides a pressure outlet between the constriction of the signal fluid passage and the spout. .

An electric actuator whose actuating piece moves in response to an electric signal is provided at a position where the actuating piece crosses the spout of the signal fluid passage to open and close it, and the movement of the actuating piece of the electric actuator opens and closes the spout of the signal fluid passage. to control the pressure at the pressure outlet of the signal fluid passage, and the control fluid passage is provided with a control valve whose valve body is moved to open and close by the pressure of the pressure chamber,
The pressure outlet of the signal fluid passage is connected to the pressure chamber of the control valve, and the pressure of the pressure outlet of the signal fluid passage is used to open and close the control valve to control the fluid in the control fluid passage. This is an electrofluidic transducer characterized by:

Function> In the electro-fluid converter a of the present invention, when an electric signal is input to the electric actuator, the actuating piece of the electric actuator moves, the nozzle of the signal fluid passage closes or opens, and the signal fluid passage is closed or opened. The pressure at the pressure outlet increases or decreases, and the pressure in the pressure chamber of the Vl g# valve in the control fluid passage increases or decreases, and the valve body of the control valve in the 'aha fluid passage moves, causing the control fluid passage to The control valve opens or closes to control the fluid in the control fluid passage.

<Effects of the Invention> In the electro-fluid converter of the present invention, in addition to the signal fluid passage in which the pressure at the pressure outlet changes with the movement of the operating piece of the electric actuator, there is a Since a control fluid passage is provided in which the control valve operates, even if the flow rate of the fluid ejected from the nozzle of the signal fluid passage is set low to improve responsiveness, the flow rate of the fluid supplied to the control fluid passage is low. The pressure or flow rate can be set high.

Therefore, the pressure or flow rate of the fluid in the control fluid passage can be varied over a wide range, and the range of the pressure or flow rate of the fluid in the control fluid passage controlled by the electric signal is wide.

First Embodiment (See Figure 1)> As shown in Figure 1, the electro-hydraulic converter of this example has a signal fluid passage 2 provided in a base 1, and an inlet 3 and an outlet of the signal fluid passage 2. 4, an outlet 4 of the signal fluid passage 2 is formed into a spout, and a pressure plate and an outlet 6 are provided between the throttle 5 of the signal fluid passage 2 and the spout 4.

An electric actuator 8 whose actuating piece 7 moves back and forth in response to an electric signal is fixed to the base l, and as shown in FIG. It is arranged at a position where it crosses the nozzle 4 of No. 2 and is operated to open and close.

The signal fluid passage 2 is opened and closed by opening and closing the nozzle 4 of the signal fluid passage 2 by moving the operating piece 7 of the electric actuator 8 back and forth.
The configuration is such that the pressure at the pressure outlet 6 is controlled.

As shown in FIG. 1, the base l is provided with a control wave passage 9, and a J
A lg# valve 12 is provided.

The control valve 12 has a control fluid passage 9 as shown in FIG.
A spool-shaped valve body 14 is slid into the valve chamber 13 that crosses the
A spiral spring 15 is inserted into one end of the valve chamber 13 so that the spiral spring 15 pushes the valve element 14 toward the other end of the valve chamber 13. The end portion is formed into a pressure chamber 16, and the pressure of the pressure chamber 16 causes the valve body 14 to be
is configured to be pushed toward one end of the valve chamber 13 against the helical spring 15.

As shown in FIG. 1, a discharge passage 17 open to the atmosphere is connected to the end surface of the valve chamber 13 of the control valve 12 on the side of the helical spring 15, and the valve body 14 of the control valve 12 is moved to the pressure chamber 16 side. Then,
A portion of the control fluid passage 9 that crosses the valve chamber 13 is closed by the valve element 14, so that the outlet 11 of the control fluid passage 9 is blocked from the inlet 10 of the control fluid passage 9 and communicated with the discharge passage 17. When the valve body 14 of the control valve 12 moves toward the helical spring 15, the portion of the control fluid passage 9 that crosses the valve chamber 13 opens.
The discharge passage 17 is closed by the valve body 14, and the outlet 11 of the control fluid passage 9 is cut off from the discharge passage 17 and communicated with the inlet 10 of the control fluid passage 9.

The pressure chamber 16 of the control valve 12 is connected to the pressure outlet 6 of the signal fluid passage 2, as shown in FIG. The structure is such that the fluid in the control fluid passage 9 is controlled by opening and closing the opening and closing operations.

When using the electro-fluid converter of this example, a signal fluid supply source is connected to the inlet 3 of the signal fluid passage 2, and a control fluid supply source is connected to the inlet lO of the control fluid passage 9. Furthermore, a controlled object is connected to the outlet 11 of the control fluid passage 9.

When no electric signal is input to the electric actuator 8, as shown in FIG. 1, the actuating piece 7 of the electric actuator 8 retreats and the nozzle 4 of the signal fluid passage 2 opens.
The pressure at the pressure outlet 6 of the signal fluid passage 2 is low.

Therefore, the pressure in the pressure chamber 16 of the control valve 12 is low, the valve body 14 of the control valve 12 is moved toward the pressure chamber 16 by the helical spring 15, and the outlet 11 of the control fluid passage 9 is closed to the control fluid passage. 9 is blocked from the inlet 10 and communicated with the discharge passage 17, the controlled object is communicated with the atmosphere and no control fluid is supplied.

After that, when an electric signal is input to the electric actuator 8, the operating piece 7 of the electric actuator 8 moves forward and covers the nozzle 4 of the signal fluid passage 2, and the ejection resistance of the nozzle 4 of the signal fluid passage 2 increases. The pressure at the pressure outlet 6 of the signal fluid passage 2 increases.

Then, the pressure in the pressure chamber 16 of the control valve 12 increases,
The valve body 14 of the control valve 12 moves toward the helical spring 15 against the helical spring 15, and the outlet 11 of the control fluid passage 9 is blocked from the discharge passage 17 and communicated with the inlet 10 of the control fluid passage 9. , a control fluid is supplied to the controlled object.

That is, in accordance with the electric signal input to the electric actuator 8, the control fluid flowing out from the outlet 11 of the control fluid passage 9, and therefore the control fluid supplied to the controlled object, is controlled.

In the electro-fluid converter of this example, in order to improve responsiveness, the flow rate of the signal fluid ejected from the spout 4 of the signal fluid passage 2, and the pressure of the signal fluid supplied to the inlet 3 of the signal fluid passage 2. Even if the flow rate is set low, the pressure or flow rate of the control fluid supplied to the control fluid passage 9 can be set high.

Therefore, the pressure or flow rate of the control fluid in the control fluid passage 9 has a wide variable range, and the range of the pressure or flow rate of the control fluid in the control fluid passage 9 that is controlled by the electric signal input to the electric actuator 8 is wide.

Second Embodiment (See Figures 2 and 3)> Compared to the previous example, the electro-hydraulic converter of this example has a control valve that opens and closes the control fluid passage 9, as shown in Figure 2. 21 is different.

As shown in FIG. 2, the control valve 21 has a valve chamber 22 with a two-stage diameter in a base l, a valve body 23 with a two-stage diameter that is slidably fitted into the valve chamber 22, and controls the small diameter end of the valve chamber 22. The small diameter end of the valve body 23 projects into the control fluid passage 9, and the valve chamber 22
The spiral spring 24 is inserted into the large diameter end of the valve chamber 22.
The large diameter end portion of the signal fluid passage 2 is connected to the pressure outlet 06 of the signal fluid passage 2 to form a pressure chamber 25 .

When the pressure at the pressure outlet 6 of the signal fluid passage 2 increases,
The pressure in the pressure chamber 25 increases, and the pressure in the pressure chamber 25 and the elastic force of the helical spring 24 push the valve body 23 toward the small diameter end of the valve chamber 22, and the small diameter end of the valve body 23 releases the control fluid. The passage 9 is closed and the pressure of the signal fluid passage 2 is taken out 0.
6 becomes lower, the pressure in the pressure chamber 25 becomes lower, and the pressure in the control fluid passage 9 moves the valve body 23 into the valve chamber 22.
The control fluid passage 9 is opened by being pushed toward the large diameter end of the control fluid passage 9.

The other points are the same as in the previous example, so the second
The same reference numerals as in the previous example are given to the figures, and the explanation will be omitted.

A case will be described in which the electro-hydraulic converter of this example is used to open and close an intake valve of an internal combustion engine.

As shown in FIG. 3, the intake valve opening/closing mechanism for an internal combustion engine includes an intake valve 33 installed in an intake hole 32 in a cylinder rod 31, and an end of a valve shaft 34 of the intake valve 33 connected to the cylinder outside of the rod 31. A helical spring 36 is fitted between the cylinder head 31 and a saucer 35 that protrudes from the valve shaft 34 and is fitted onto the protruding end of the valve shaft 34, so that the intake valve 33 is closed by the helical spring 36.

On the surface of the base 37 protruding from the cylinder Rad 31, a third
As shown in the figure, a pressure hole 38 is bored, a plunger 39 is slid into the pressure hole 38, and the tip of the plunger 39 is brought into contact with the protruding end of the valve shaft 34 to supply fluid to the base end of the pressure hole 38. When the passage 40 is connected and fluid is supplied from the fluid supply passage 40 to the pressure hole 38, the plunger 39 moves forward against the helical spring 36 and the intake valve 33 opens.

As shown in FIG. 3, a fluid discharge passage 41 is connected to the circumferential surface of the pressure hole 38, and a detour passage 43 with a flow control valve 42 interposed is connected between the fluid supply passage 40 and the fluid discharge passage 41. are doing.

As shown in FIG. 3, the outlet 11 of the control fluid passage 9 of the first TL air-fluid converter fiA of this example is connected to the fluid supply path 40 of the intake valve opening/closing mechanism, and the first electro-fluid converter A A control fluid supply source a is connected to the inlet 10 of the control fluid passage 9, and a signal fluid supply source a is connected to the inlet 3 of the signal fluid passage 2 of the first electro-fluid converter 22A.

As shown in FIG. 3, the fluid discharge passage 41 of the intake valve opening/closing mechanism is connected to the inlet 10 of the control fluid passage 9 of the second TL gas-fluid converter 2FB of this example, and the second Tfl gas-fluid converter B A signal fluid supply source is connected to the inlet 3 of the signal fluid passage 2.

Then, with the intake valve 33 of the intake valve opening/closing mechanism closed, the first. Second electrofluidic converter A.

Electric signals are input to the electric actuators 8 of the first and second electric actuators 8, respectively. The control valves 21 of the second electro-hydraulic converters 21A and 21H are respectively closed, and the control valves 21 of the second electro-hydraulic converters 21A and 21H are closed. second electro-hydraulic converter A,
The control fluid passages 9 of H are each shut off.

In such a starting state, the first electro-hydraulic converter A
The electric signal input to the electric actuator 8 is cut off.

Then, at the first Ttf, the control valve 21 of the gas-fluid converter A opens, the control fluid passage 9 of the first electro-fluid converter A opens, and the control fluid of the control fluid supply source a flows into the first Tr.
It flows into the pressure hole 38 through the control fluid passage 9 of the L air-fluid converter A and the fluid supply passage 40 of the intake valve opening/closing mechanism, and the plunger 39 starts moving forward against the helical spring 36 to close the intake valve 33. starts the opening operation.

After the intake valve 33 starts opening, an electric signal is input to the electric actuator 8 of the 171 t% fluid conversion device 2ffiA.

Then, the control valve 21 of the first FL air-fluid converter fiA closes, the control fluid passage 9 of the first electro-fluid converter 71A is cut off, the plunger 39 stops moving forward, and the intake valve 33 closes. The opening amount at that time becomes the open state.

Thereafter, the "tT!" air signal input to the electric actuator 8 of the second electro-hydraulic converter B is cut off.

Then, the second electro-hydraulic converter g! The control valve 21 of iB opens, the control fluid passage 9 of the 27th ff air-fluid converter B opens, the plunger 39 starts to retreat by the helical spring 36, and the intake valve 33 starts a closing operation, The control fluid in the pressure hole 38 is discharged via the fluid discharge path 41 and the control fluid path 9 of the second electro-hydraulic converter B.

When the closing operation of the intake valve 33 is nearing completion and the retreating plunger 39 closes the open end of the fluid discharge path 41 on the circumferential surface of the pressure hole 38, the control fluid in the pressure hole 38 flows into the flow rate control valve 4.
It flows out into the control fluid passage 9 of the second electro-hydraulic converter B through the detour path 43 with 2, and the closing speed of the intake valve 33 becomes a slow speed preset to the flow rate control valve 42, and the intake valve 3
3 closes quietly.

In this intake valve opening/closing mechanism for an internal combustion engine, the control fluid supplied from the control fluid supply source a to the control fluid passage 9 of the first electro-hydraulic converter A, that is, flows into the pressure hole 38 and pushes the plunger 39. By setting the pressure and flow rate of the 1TJIW fluid to be pushed high, the intake valve 33 can be opened at high speed.

Third Embodiment (Refer to FIGS. 4 to 6)> Compared to the first embodiment, the electro-hydraulic converter of this embodiment has a large diameter of the nozzle 4 of the signal fluid passage 2, as shown in FIG. The electric actuator 51 for opening and closing is different.

As shown in FIGS. 4 and 5, the electric actuator 51 is composed of a ceramic rectangular piezoelectric plate 52 that expands or contracts when a voltage is applied, and a metal rectangular elastic plate 53 that bends and restores its original shape. The base end of the piezoelectric element 51, which is a piezoelectric element made of joined overlapping beams and inputs an electric signal, is fixed to the base l, and the tip of the piezoelectric element 51, that is, the actuating piece 7, which is bent by the input of an electric signal, is connected to the signal fluid passage 2. It is placed at a position where it can be opened and closed across the nozzle 4.

Further, in the electro-hydraulic converter of this example, as shown in FIG. 4, the inlet 3 of the signal fluid passage 2 and the inlet 10 of the control fluid passage 9 are shared.

In the electro-fluid converter of this example, the signal fluid passage 2
The pressure or flow rate of the fluid supplied to the common inlets 3 and 10 of the control fluid passage 9 is set high, and the signal fluid passage 2 is
When the resistance of the throttle 5 and the nozzle 4 is set high, the flow rate of the signal fluid ejected from the nozzle 4 of the signal fluid passage 2 decreases, increasing responsiveness, and the flow rate of the signal fluid ejected from the nozzle 4 of the signal fluid passage 2 increases. The pressure or flow rate of the control fluid increases,
The control range of the control fluid becomes wider.

The other points are the same as in the first embodiment, so the same reference numerals as in the first embodiment are given to FIG. 4, and the explanation will be omitted.

A case will be described in which the electro-hydraulic converter of this example is used to open and close a fuel injection valve of an internal combustion engine.

As shown in FIG. 6, the fuel injection valve has a large-diameter fuel passage 56 and a small-diameter shaft hole 57 in communication with each other in a valve cylinder 55.
7 is opened at the tip of the valve cylinder 55, and a conical valve seat 58 is formed at the tip of the valve cylinder 55.

As shown in FIG. 6, the shaft hole 57 has a two-stage diameter valve shaft 59.
The large diameter portion of the valve stem 59 is inserted into the large diameter portion of the valve stem 59, and the conical valve body 60 connected to the tip of the small diameter portion of the valve stem 59 is fitted into the valve seat 58. The proximal end of the valve shaft 59 protrudes into the fuel passage 56 and enters the fuel passage 5 through the notch 61 on the circumferential surface of the large diameter part of the valve shaft 59.
6 is communicated with the shaft hole 57.

As shown in FIG. 6, a helical spring 63 is fitted between the saucer 62 attached to the proximal end of the large diameter portion of the valve shaft 59 and the distal end surface of the fuel passage 56, and the helical spring 63 causes the valve body 60 to open. The tip opening of the shaft hole 57 is closed by pressing against the seat 58.

When fuel is supplied to the fuel passage 56, the fuel in the fuel passage 56 passes through the notch 61 on the circumferential surface of the large diameter part of the valve shaft 59 and enters the shaft hole 57.
The pressure of the fuel causes the valve shaft 59 to release the helical spring 63.
The valve body 6 degrees moves forward against the valve seat 58, and the tip opening of the shaft hole 57 opens, and fuel is injected from the open tip opening of the shaft hole 57.

In the fuel passage 56 of the fuel injection valve, as shown in FIG.
Outlet 11 of the control fluid passage 9 of the electro-hydraulic converter of this example
and connect the signal fluid passage 2 of the electro-hydraulic converter of this example.
and a common inlet of the control fluid passage 9 3. A fuel supply source C is connected to lO.

When an electric signal is input to the electric actuator, that is, the piezoelectric element 51 of the electro-fluid converter of this example, the actuating piece 7 at the tip of the piezoelectric element 51 bends and covers the nozzle 4 of the signal fluid passage 2, and the control valve 12 is opened. Then, the M control fluid passage 9 opens, fuel from the fuel supply source C is supplied to the fuel passage 56 of the fuel injection valve via the control fluid passage 9, and the tip opening of the shaft hole 57 opens, and the shaft Fuel is injected from the opening at the tip of the hole 57.

Pressure'i1! When the electric signal input to the element 51 is cut off, the first operating piece 7 is restored, the nozzle 4 of the signal fluid passage 2 is opened, the control valve 12 is closed, and the control fluid passage 9 is shut off. Fuel from the fuel supply source C is not supplied to the fuel passage 56 of the fuel injection valve, the opening at the tip of the shaft hole 57 is closed, and fuel injection is stopped.

This fuel injection valve can inject fuel with high responsiveness and high pressure.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an electro-hydraulic converter according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of an air-fluid converter according to the second embodiment. FIG. Fig. 4 is a cross-sectional view of the electro-hydraulic transducer of the third embodiment. Fig. 5 is a perspective view of the electric actuator of the electro-hydraulic transducer of the rotating type. 2 is a sectional view of a fuel injection valve for an internal combustion engine using the electro-hydraulic converter. 2: Signal fluid passage 3: Inlet 4: Outlet, nozzle 5: Throttle 6: Pressure outlet 7: Actuation piece 8 : Electric actuator 9: Control fluid passage 12: Control valve 14: Valve body 16: Control valve in pressure chamber 2 23: Valve body 25: Pressure chamber 51: Electric actuator, pressure TrL element patent applicant
Toyota Central Research Institute Co., Ltd. Patent Attorney Katsura Mizuno No. 1
Diagram OZ Diagram O6 Diagram

Claims (1)

[Claims] A throttle is provided between the inlet and the outlet of the signal fluid passage, the outlet of the signal fluid passage is formed as a spout, and a pressure outlet is provided between the throttle of the signal fluid passage and the spout. , an electric actuator whose actuating piece moves in response to an electric signal is provided at a position where the actuating piece crosses the nozzle of the signal fluid passage to open and close, and the movement of the actuating piece of the electric actuator opens the nozzle of the signal fluid passage. The control fluid passage is configured to open and close to control the pressure at the pressure outlet of the signal fluid passage, and the control fluid passage is provided with a control valve whose valve body moves to open and close according to the pressure in the pressure chamber. An electric fluid characterized in that the pressure outlet of the signal fluid passage is connected and the control valve is opened and closed by the pressure of the pressure outlet of the signal fluid passage to control the fluid in the control fluid passage. conversion device.