JPS6053288A - Actuator device - Google Patents

Abstract

PURPOSE:To attain step variation of the actuator's stroke per unit of hour by varying the throttle air of a solenoid valve when the load applied on the actuator is increased. CONSTITUTION:When the solenoid coil 14 of a solenoid valve is excited, a plunger 16 is subjected to a downward force to move it to a stop where the lower end thereof makes contact with the upper face of a stopper 24. Compressed air, at this time, passes through an inlet port 11 and is sent via a pipe passage 37 into an air cylinder 32. A temporary stoppage of the movement of a piston 33 causes urgent rise in back pressure, whereby pressing the stopper 24 upwards to reduce the distance between the valve seat 17 of the inlet port 11. The stroke of the air cylinder 32 per unit of hour is therefore minimized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an actuator device, and more particularly to an actuator device in which an actuator is connected to an electromagnetic valve, and the fluid supplied to the Akubuco T-Y is controlled by the electromagnetic valve.

Automobiles are equipped with a transmission, which changes the speed of the engine's rotation and transmits it to the drive wheels. When performing this gear shifting operation, the shift lever installed in the driver's seat must be used.
By operating , you can select the gear that will transmit the power. In a speed change operation of this transmission, the shifter sleeve is moved and synchronized by a synchronizer ring, after which the shifter sleeve is brought into mesh with the speed change gear of the main shaft. Therefore, when operating the shift lever by hand, resistance is felt midway through, and at this time, the movement speed of the shifter sleeve is slowed down to perform a synchronizing action.

If you want to automatically change the speed of the above transmission, use an actuator such as an air cylinder,
This actuator will move the thick sleeve via the fork.

Then, in order to perform this gear shifting operation, a G controller, such as a solenoid valve, is opened to supply compressed air to the air actuator.
This causes the piston rod to move forward.

However, when using a conventional electromagnetic valve, since this electromagnetic valve can only take two modes, listening and closing, the unit time when moving the thick sleeve through the fork with The hit stroke becomes constant. Therefore, when using a solenoid valve with a small A-refit that results in a slow rise for synchronization, the operation becomes slow even when synchronization is not achieved, resulting in the disadvantage that switching takes a long time. .

Therefore, it is also considered to use an electromagnetic valve in which the diameter of the orifice changes so that the stroke of the actuator per intermediate distance changes in stages. However, such a conventional electric valve has a drawback that the orifice is mechanically changed, resulting in a complicated structure and poor durability.

The present invention was made in view of this problem, and when the load applied to the actuator becomes large and its back pressure exceeds a predetermined value, the throttle amount of the electromagnetic valve changes. The object of the present invention is to provide an actuator device in which the stroke per unit time of an actuator changes stepwise.

The present invention will be explained below with reference to an illustrated embodiment.

As shown in FIG. 1, the electromagnetic valve includes a casing 10, and an inlet boat 11 is provided on the upper surface of the casing 10.
is formed, and an outlet boat 12 is provided on the side surface of the casing 10.

Furthermore, a solenoid coil 14 is disposed within the casing 10 below the partition wall 13. A guide tube 15 is attached to the inside of the solenoid coil 14, and a plunger 16 is slidably disposed on the guide tube 15. The upper surface of the plunger 16 constitutes a valve, and is brought into contact with a valve seat constituted by a ring-shaped projection 17 formed inside the inlet boat 11.

3- The diameter of the plunger 1716 is smaller at the lower end than at the upper end, and a return spring 19 is interposed below the stepped portion 18 where the diameter changes.

Further, above the stepped portion 18 of the plunger 16, a hole 20 for evacuation is formed extending in the axial direction on the outer circumferential surface of the plunger 16. The return spring 19 is inserted into the opening 22 of the plate 21.
The stopper 2/I is inserted through the inner casing 23 and is numbered by two sides of the stopper 2/I arranged inside the lower casing 23. The stopper 2/I is movably supported by a support part 25 formed in the casing 23, and this support part 25
A return spring 26 attached to the lower side of J: is adapted to force it downward.

The stopper 21 has a
An air passage 27 is formed. And this air passage 2
In order to exhaust the air passing through 7, an exhaust bow 1-28 is formed in the casing 23. Rani casing 2
A diaphragm 29 is attached to the stopper 3 so as to divide the internal space into two, and the diaphragm 29 is connected to the stopper 24 by a screw 30. An inlet port 31 is formed on the lower side of the casing 23, and the diaphragm 29 is pushed by supplying control pressure through this port 31.

Next, the air actuator 32 controlled by the electromagnetic valve will be described.
2 is composed of a cylindrical body, and a piston 33 is movably disposed inside the body. This piston 3
3 is connected to a piston rod 34, and a fork 35 is fixed to the tip of this piston rod 34. This fork 35 is engaged with a groove formed on the outer circumferential surface of the shifter sleeve to move the thick sleeve of the transmission in the axial direction. Further, the air actuator 32 has an inlet port 36 formed on its back side, and this port 36 is connected to the outlet boat 12 of the electromagnetic valve via a conduit 37. Further, a control port 38 is formed on the back side of the air actuator 32, and the port 38 is connected to the inlet port 31 of the electromagnetic valve via a conduit 39.

Next, the operation of the Akubuni 2T-ta installation according to the above configuration will be explained. When switching the transmission using this [acgu] eta device, shift 1 to 1
Operate the collar. Then, when operating this shift lever, 1
1', the solenoid coil 14 of the electromagnetic valve becomes 1i.
iI + magnetized, this] coil 4 plunges (・1
6 receives a downward force. Therefore, the plunger 16 moves downward against the return spring 19 and stops at the position where the lower end of the sea urchin (J) shown in FIG. Therefore, the plunger 16 closes the air passage 27 of the stopper 24, and the upper surface of the plunger 16 separates from the valve seat 17 of the inlet port 11, opening the artificial valve 1-11.

Then compressed air enters the inlet port 11 from the air tank (not shown).
and enters the casing 10 through the outlet boat 12 and the conduit 37 to the inlet boat 36 of the air cylinder 32 from which it is supplied into the air cylinder 32. The pressure of the compressed air therefore pushes the piston 33 to the right in FIG. 1 against the return spring 40. Then, the piston rod 34 connected to the piston 33 is pushed out, and the fork 35 attached to the tip of the rod 34 also moves, causing the shifter sleeve to move in the engaging direction.

When the shifter sleeve is moved by the air cylinder 32 via the fork 35, the teeth 42 formed on its inner peripheral surface move to the position shown by the chain line in FIG.
It contacts the chamfered surface of the teeth 42 of the synchronizer ring to effect synchronization.

When the synchromesh mechanism is synchronized, the air cylinder 32 receives a reaction force from the shifter sleeve, and the piston 33 becomes temporarily stationary.

When the piston 33 temporarily stops moving for synchronization of the synchromesh mechanism, the back pressure of the air cylinder 32 rapidly increases. This rapidly increased back pressure is supplied to the electromagnetic valve through the control valves 1 to 38 and the conduit 39, and pushes the lower surface of the diaphragm 29. Therefore, the stopper 24 connected to this die It will stop in this state.

As this stopper 2/I moves upward,
Since the lower end of the plunger 16 is also pushed in one direction, the plunger 16 is displaced as shown by the chain line in FIG. Therefore, the distance between the upper surface of the plunger 16 and the valve seat 17 of the inlet boat 11 becomes small, and a throttle is formed in this area. Therefore, from then on, the amount of compressed air supplied to the air cylinder 32 through this electromagnetic valve becomes smaller, and the stroke of the air cylinder 32 per unit time becomes smaller.

The relationship of the stroke of the air cylinder 32 with respect to time is shown in FIG.
The piston rod 34 moves at a fast speed until the tooth 8-42 of the synchronizer ring comes into contact with the piston rod 34, but after that it moves at a slow speed. The meshing of the gears is reliably achieved through the synchronous operation of the synchromesh. Therefore, the gear change operation of the transmission is performed in the same way as when a person adjusts the speed of operation of the shift lever in accordance with the resistance felt through the shift lever. Moreover, according to this acticoator device, the shifter sleeve is rapidly moved until the synchronous operation is performed. In comparison, the overall switching time can be shortened.

Next, the backward motion of the air cylinder 32 will be explained with reference to FIG. Even during this backward movement, the back pressure of the air cylinder 32 is supplied to the two diaphragms via the conduit 39, so if the back pressure during the backward movement is high, the diaphragm 2 As a result, the stopper 24 is moved from 71 to 10,000 as indicated by the chain line in FIG. In this situation, operate the shift lever [
When the solenoid coil 14 is demagnetized, the plunger 16 is moved upward by the return spring 19, and its upper surface contacts the valve seat 17 to close the entry boat 11.

At this time, since the stopper 24 has moved upward, the distance between the lower surface of the plunger 16 and the upper surface of the stopper 24 has become smaller, and a diaphragm is formed in this portion.

Therefore, the air in the air cylinder 32 is guided into the casing 10 of the electromagnetic valve through the port 36, the conduit 37, and the inlet port 12, and then through the casing 10 formed on the outer circumferential surface of the plunger 16. It will flow downward and be vented through the air passage 27 of the stopper 24 and the exhaust ports 1-28. In this case, as described above, since a restriction is formed between the lower surface of the plunger 16 and the lower surface of the stopper 24, 1) one air resistance is large, and therefore the piston 33 moves back slowly. This state is the fifth
This is the early stage of the stroke shown in the figure, and the change in stroke over time is gradual.

Next, when the back pressure of the air cylinder 32 becomes low,
Since the force pushing the diaphragm 29 of the electromagnetic valve is also released, the stopper 24 is moved downward by the return spring 26 as shown by the solid line in FIG. Therefore, stopper 2
The gap between the upper surface of M+ and the lower surface of the plunger 16 becomes larger, and the exhaust resistance becomes smaller. Therefore, from this point on, the air in the air cylinder 32 is rapidly discharged, so that the piston 33 and the rod 34 are rapidly returned by the return spring 40. At this time, as shown in FIG. 5, the stroke of the air cylinder 32 changes rapidly over time. Therefore, even during the backward movement, the operation time can be shortened compared to the characteristic shown by the dotted line in FIG. 4 when a fixed diaphragm electromagnetic valve is used.

Although the present invention has been described above with reference to the illustrated embodiment, the present invention is not limited to the above-described embodiment, and various modifications can be made based on the technical idea of the present invention. For example, although the present invention is applied to a transmission switching device in the embodiment described above, the present invention can be applied to various types of devices. Moreover, various design changes are possible with respect to the shape of the electromagnetic valve in the above embodiment.

As described above, the present invention provides a solenoid valve with a stopper that controls the flow rate, and also provides a moving means for moving this stopper using control pressure, and applies back pressure of the actuator to the moving means of the solenoid valve. Try to add
21-If a load is applied overnight and the back pressure changes, the plunger of the electromagnetic valve is displaced by the moving means. Therefore, according to the present invention, when a load is applied to the actuator, the operating method 1η of the actuator is changed from that point on, thereby making it possible to change the initial speed of the actuator in stages.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view without showing the actuator device according to an embodiment of the present invention, and Fig. 2 is a developed plan view of a synchronized mesh mechanism of a transmission operated by the actuator device. , FIG. 3 is a sectional view similar to FIG. 1 for explaining the double-acting operation, and FIG. 4 is a graph showing changes in the stroke of the actuator shown in FIG. 1.
FIG. 5 is a graph showing changes in the stroke of the actuator shown in FIG. 3. FIG. In addition, in the symbols used in the drawings, 14... Solenoid coil 16... Plunger (valve) 24... Stopper 29... Diaphragm 32... Air actuator 38... Control port. Applicant Hino Motors Co., Ltd.

Claims (1)

[Claims] Connect the actuator to a solenoid valve, install a stopper on the solenoid valve to control the flow rate, and install a stopper on the solenoid valve to control the fluid supplied to the actuator. is provided with a moving means for moving the electromagnetic valve according to the control pressure, and applies back pressure of the actuator to the moving means of the electromagnetic valve, and when a load is applied to the actuator and the back pressure changes, the moving means An actuator device characterized in that a plunger of an electromagnetic valve is displaced.