JPS61270573A - High speed spool position control device - Google Patents

Abstract

PURPOSE:To make it possible to control the position of a spool at a high speed, by leading a high pressure in the opening section of the spool at the back pressure chamber side into oil chamber through a passage formed in an input rod. CONSTITUTION:An input rod 28 is slidably fitted in a slide hole 29 in a valve body 20 with its front end being projected into a back pressure chamber 24 for a spool 21 to define an orifice between itself and the opening section of the spool 21. A control rod 31 which projects outside of the valve body 20 is formed at the rear end of the input rod 28. Further, an oil chamber 32 is defined between the slide hole 29 and the input rod 28, and a passage 28b for leading the pressure in the opening section of the spool 21 at the back pressure chamber 24 side into the oil chamber 32 is formed in the input rod 28. With this arrangement, the position of the spool may be controlled at a high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a spool position control device that moves a spool at high speed following an input member.

[Conventional technology]

Conventionally, as this type of spool position control device, there has been one shown in FIG. 11, for example.

To explain this simply, a spool 2 is housed in the valve body 1 and is biased in the valve closing direction by a spring B. Inside the spool 2, a passage having an orifice 4 is connected to an input port 5 and a spool back pressure chamber. A passageway 9 having a conical opening 8 communicating between the back pressure chamber 6 and the outlet port 7 is also provided.

This spool 2 forms an orifice 11 between it and the tip of the input lot 10 and follows the input lot 10. That is, when the input rod 10 is pushed to the right in the figure, the orifice 11 is closed, the pressure in the back pressure chamber 6 is increased, and the spool 2
As shown in the figure, the right edge is in close contact with the seat portion 12 to close the flow path between the inlet port 5 and the outlet port 7.

When the input lot 10 is moved to the left, the spool 2 follows it and moves to the left, separating from the sea 1 part 12 and opening the flow path.

[Problem that the invention seeks to solve]

However, in such a conventional spool position control device, the input rod 10 was simply rod-shaped and protruded outward from the back pressure chamber 6, so the pressure at the outlet port 7 acted on the cross-sectional area of the input rod 10. Was.

Therefore, in order to make the spool 2 follow at an extremely high speed, it is necessary to significantly enlarge the diameter of the input hole 10, the opening 8, and the passage S. If the input lot 10 is connected to the input lot 10, a large ejection force will be applied to the input lot 10. Therefore, there was a problem in that a large input control device was required.

The object of the present invention is to solve these problems of the conventional device.

Means for Solving Problems] Therefore, the high-speed spool position control device according to the present invention is slidably inserted into the input lot k of the spool position control device as described above, and into the sliding hole of the valve body. The tip protrudes into the back pressure chamber of the spool to form an orifice between it and the opening of the spool, while the rear end is provided with an operating rod that protrudes to the outside of the valve body to connect the sliding hole and the input rod. An oil chamber is formed between the input rod and the input rod, and a passage is provided in the input rod to introduce the pressure from the opening on the back pressure chamber side of the spool into the oil chamber.

[For production]

By guiding the pressure at the back pressure chamber side opening of the spool through the passage provided in the auxiliary oil chamber input rod, the force in the ejection direction due to the pressure at the outlet port acting on the input rod is balanced, and the operating rod is By displacing it with operating force, it becomes possible to control the spool position at high speed.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a sectional view showing a first embodiment of the invention.

The spool 21 housed in the valve body 20 of this high-speed spool position control device is connected to the valve body 1 and has an inlet port 22.
A cylindrical V-cut 21a formed at the tip of the spool 21 controls the opening of the flow path between the spool 21 and the outlet ports 1-23. This spool 21 is biased by a spring 25 provided in the back pressure chamber 24 in a direction to close the opening of the flow path.

Then, the pressure of the inlet port 22 is applied to one surface 21b of this spool 21 (the tapered surface on the right side in the figure), and the pressure of the inlet port 1-2 is applied to the back pressure chamber 24 to which the other surface is exposed.
A passage 27 is formed in the valve body 20 through which pilot oil flows from 2 through an orifice 26, and a passage 21c is formed in the spool 21 along its central axis to communicate the back pressure chamber 24 with the outlet port 23. . The opening of this passage 21c on the back pressure chamber 24 side is a conical opening 21d.

On the other hand, the input rod 28 is slidably inserted into the sliding hole 2 formed in the valve body 20, and its tip protrudes into the back pressure chamber 24 and connects with the opening 21d of the spool 21. An orifice 30 is formed therebetween, and the pilot oil flowing into the back pressure chamber 24 through the orifice 26 is caused to flow out through the forming orifice 30 and the passage 21c in the spool 21 to the outlet port 23.

Further, a valve body 20 is provided at the rear end of the input rod 28.
As shown in FIG. 2, an operating rod 31 protruding to the outside of the input rod 28 is provided integrally with the input rod 28. An oil chamber 32 is formed between the sliding hole 2 and the input lot 28.

Furthermore, a large-diameter passage 28a is bored along the central axis from the distal end surface (right end surface in the figure) of the input lot 28,
A pair of small roads 28b are provided on both sides of the operating rod 31 from the rear end surface (left end surface in FIG. 1).

28b is bored to communicate with the passage 28a, and this passage 28
The pressure of the opening 21d of the spool 21 is introduced into the oil chamber 32 through B and 28b.

The operating principle of this embodiment is the same as that of the conventional example shown in FIG. Since a large amount can be discharged, it is possible to make the spool 21 follow the displacement of the input lot 28 at high speed.

Furthermore, the member that protrudes to the outside is a thin operating rod 31, and its protrusion force is due to the outlet port pressure applied to the cross-sectional area of diameter D2, and even if the diameter of the input rod 28 is made sufficiently large, the force will be small. You can.

According to this embodiment, since the pressure in the oil chamber 32 is the same as the pressure in the passage 21c of the spool 21, the force relationship between the input rods 28 is almost balanced even if the pressure in the outlet port 1-23 is high. The ejection force is only the force acting on the operating rod 31 (diameter D2).

Therefore, the operating rod 31 can be displaced with a small operating force, and the position of the spool 21 can be controlled at high speed.

FIG. 3 shows a second embodiment of the present invention, in which the same parts as in FIG. 1 are given the same reference numerals, and their explanation will be omitted.

In this embodiment, pilot oil from the pilot oil pressure source '5B is supplied to the back pressure chamber 2 from the pilot oil pressure supply port 34 formed in the valve body 20 through the orifice 26.
I am trying to have it flow into 4.

Further, the input rod 38 is the input rod 28 of the first embodiment.
The operating rod 31 is integrally provided in substantially the same manner as the passage 38a,
38b, a large diameter portion 38C is provided at the rear end forming the oil chamber 32, and the oil chamber 35 formed by the difference between the diameter D3 of the large diameter portion 38C and the diameter DI of the main body including the tip portion is connected to the tank. 6
It is connected to tank ports 1 to 36 which communicate with tank port 7.

The diameter D3 of this large diameter portion is (π/4)・D22 (π/
4)・(D3" r)+2) is determined as appropriate. In other words, the large diameter portion 38C is thicker than the main body by the radial cross-sectional area of the operating rod 31 D2":D3"
In the case of Dl2, the force acting on the input rod 38 is balanced, and the operating force may be extremely small. Also, D2′〈D
In the case of 3'-Dl2, the input rod row 8 is always drawn in, and when the external operation pulling force is removed, the input rod itself is drawn in, and the spool 21, which is the main valve, also moves to the right and enters the inlet bow 1. The flow path between 22 and outlet port 23 is closed.

There are various types of external operating means, such as electromagnetic actuators and hydraulic systems, but the illustrated example uses a proportional solenoid with a position sensor, and in this case, highly accurate control is possible.

FIG. 4 shows a third embodiment of the present invention, and FIG.
Parts similar to those in the drawings are marked with the same amount, and their explanation will be omitted.

In this embodiment, a spool 41 having a substantially equal area is used, and the back pressure chamber 24 is communicated with the outlet port 43 through a T-shaped passage 41c formed inside the spool 41. In addition,
The arrangement of the inlet ports 1 to 42 and the outlet ports 1 to 43 is the first. This is the opposite of the second embodiment.

Further, in this embodiment, shaft valves 44 are provided, and pilot oil is normally supplied from the inlet port 42 through the passage 45, but pilot oil is also supplied to the pylon from another pilot oil pressure source 33.
- Hydraulic supply port allows pilot oil to be supplied throughout the day. That is, external pylon l-operation is possible.

Furthermore, the input rod 48 is the input rod 3 of the second embodiment.
8, the passages 48a, 48b and the large diameter portion 48C are formed, but the tip portion 48d is further formed thicker (diameter D4) than the main body portion (diameter D+).

−11= Therefore, since the pressure of the back pressure chamber 24 acts on the area formed by the difference between the diameters D4 and Dl, the input rod 48
A pulling force into the back pressure chamber 24 acts on the operating rod 31.

On the other hand, if the tip is made thinner than the main body (D4<D+), a protruding force to the left will act as shown in FIG. These relationships are determined by taking fluid forces into consideration. Also, (π/4)(D32
The diameter D3 of the large diameter portion 48c is determined by taking into account the fluid force to the relationship D42)=(π/4)D22.

FIG. 5 shows a fourth embodiment of the invention, and FIG.

Components similar to those in FIGS. 3 and 4 are designated by the same reference numerals, and their description will be omitted.

In this embodiment as well, a spool 51 having an approximately equal area is used, but an L-shaped passage 51 is formed inside the spool 51.
c communicates the back pressure chamber 24 with the outlet port 43.

Further, this spool 51 is formed with a passage 51e having an orifice 51d, through which the oil from the piston 1 flows into the back pressure chamber 24 from the inlet port 42.

Furthermore, an oil passage 54 with a solenoid valve 52 and an orifice 53 inserted therein is provided externally, and a port 5 formed in the body 20 is provided.
5.56, and this path also connects to the inlet port 42.
The structure is such that pilot oil can flow from the back pressure chamber 24 into the back pressure chamber 24.

Note that the operation of the operating rod 31 can be performed with high precision using a proportional solenoid equipped with a position sensor.

By the way, the purpose of this invention is to enable high-speed movement of the spool in one direction with a small operating force, and movement of the spool in the other direction is not considered, so it is generally possible to move the spool in one direction with a small pilot flow rate determined by the orifice diameter. good. However, if you want to control the movement in other directions at high speed, you can increase the orifice diameter only when the spool is moving.
All you have to do is increase the flow rate.

This fourth embodiment is used in such cases.

FIG. 6 shows a fifth embodiment of the present invention, in which the same parts as in FIG. 3 are given the same reference numerals, and their explanation will be omitted.

The spool 61 in this embodiment is of a poppet type, and the first
V cut-61a similar to the spool 21 in Figures and Figure 3.
and a tapered surface 61b, but the opening 61d on the back pressure chamber 24 side of the passage 61c that communicates the back pressure chamber 24 with the outlet port 23 has a diameter slightly larger than the diameter of the tip of the input rod 38. It is formed as a four-stage section.

Further, a passage 61f having an orifice 61e is formed in this spool 61, and oil is made to flow into the pilot 1 from the input port 22 to the back pressure chamber 24 through this passage 61f.

By the way, the spool is controlled to follow the input rod,
If the input rod is moved at extremely high speed, the spool will move with a certain delay in position, and it is conceivable that the input rod and spool will eventually collide.

In this embodiment, the tip of the input rod 38 and the spool 6
The orifice 60 formed by the opening 61d of No. 1 is formed into a two-stage diaphragm shape, and before the spool 61 collides with the input rod 38 at high speed, it is decelerated by a cushioning action, and position tracking is performed thereafter. It is.

7 is an enlarged view of the main part of FIG. 6, and FIG. 8 is a speed diagram thereof. For example, if the input rod 38 momentarily moves to the position shown in the upper side of FIG. 7, the spool 61 The pressure oil in the back pressure chamber 24 is discharged into the passage 61c as shown by the arrow A, and the spool 61 moves at high speed in the direction of the arrow B due to the discharge flow rate.

Then, as the corner a of the spool 61 approaches the corner d of the input rod 38, its area is rapidly closed. After that, the tapered part b and then the cylindrical surface part C are sequentially changed to the corner part d.
It is further decelerated as it approaches the orifice 60, and is finally positioned at an opening suitable for the orifice 60, as shown in the lower part of FIG.

FIG. S is an enlarged sectional view of a main part showing only an orifice forming part of a sixth embodiment of the present invention.

In this embodiment, the back pressure chamber side opening 71d of the passage 71c formed in the spool 71 is formed into a conical shape, and the tip end 78d of the input rod door 8 is formed into a stepped shape that is thinner than the main body.
Furthermore, the tip of the spool 7 is made into a tapered surface.
The orifice 70 is formed between the first opening 71d and the first opening 71d to provide a cushioning effect similar to the fifth embodiment described above.

The fifth of these. According to the sixth embodiment, even if the spool is followed and moved at extremely high speed, the input rod and the spool will not collide and be damaged.

FIG. 10 shows a seventh embodiment of the present invention, in which the same parts as in FIGS. 1 and 4 are given the same reference numerals.

This embodiment is an example in which the spool drive and the switching line by the spool are separated, and the outer periphery of the spool 81 has
A passage 81c formed along the central axis includes a land portion 81a that opens and closes the main flow path between the inlet port 82 and the outlet port 83, and a tapered surface 81b that receives the pilot oil pressure of the pilot oil pressure supply port 84. The pressure chamber 24 is communicated with a tank bow 1-85 which communicates with the tank 37.

According to this embodiment, various flow path switching is possible depending on the shape of the land portion 81a of the spool 81.

〔Effect of the invention〕

As described above, the high-speed spool position control device according to the present invention can move the spool at an extremely high speed while following the position of the one-way input rod.

Moreover, the operating force of the input rod can be extremely small, and the operating force can be zero or in the direction of protrusion or retraction.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing a first embodiment of the present invention, and FIG. 2 is a perspective view of the main parts of the input rod as seen from the rear end side. FIG. 4 is a longitudinal sectional view showing a third embodiment of the invention, FIG. 5 is a longitudinal sectional view showing a fourth embodiment of the invention, and FIG. 6 is a longitudinal sectional view showing a fifth embodiment of the invention. FIG. 7 is an enlarged explanatory view of the main part of FIG. 5, FIG. 8 is a velocity diagram thereof, and FIG.
FIG. 0 is a longitudinal sectional view of a seventh embodiment of the present invention. FIG. 11 is a longitudinal sectional view showing an example of a conventional spool position control device. 20... Valve body 21.4? ,51.61,71,8? ...Spool 2
2.42.82...Inlet port 1-2"+, 43.83...Outlet port 24...Back pressure chamber 25...Spring 26
．． 51d, 53, 61e, - orifice 28.38,4
8.78...Input rod 2 days...Sliding hole 30, EiO, 70...Formation orifice 31...Operating rod 2,35...Oil chamber 34.46.84
...Pylon 1 - Hydraulic supply port 3 days... Proportional solenoid with position sensor - Ann - N81 Figure 7 Figure 9 You Figure 11 Procedural amendment (voluntary) June 21, 1985 1, Incident Indication Patent Application No. 112209, title of the invention Relationship with the Ministry of Finance case for amending high-speed spool position control device 3 Patent applicant No. 16-46, Minami Kamata 2-chome, Ota-ku, Tokyo (338)
Tokyo Keiki Co., Ltd. 4, Agent 1-20-5 Higashiikebukuro, Toshima-ku, Tokyo (1) Claims column 6 of the specification, contents of amendments (]) Correct accordingly. (2) Correct “operation lot” on page 6, line 16 of the same book to (f operation rod). (3) Correct “in Figure 5” to “J in Figure 6” on page 18, line 19 of the same book. Correct. (4) "Derutsu." on page 19, line 5 of the same book is r. Correct it to A. (5) r61e, J on page 19, line 11 of the same book is FEile,
Correct it to U. Claims (53 papers) 1
A spool for continuously adjusting the opening degree depending on the position between an inlet port and an outlet port formed in the valve body, and an input rod for controlling the position of the spool are provided, and one surface of the spool is provided with the above-mentioned spool. The pressure of the inlet port or pilot hydraulic supply port is applied, and the other side is exposed to the back pressure chamber in which the spool is housed. The spool is provided with a passage that opens into the back pressure chamber and communicates with the outlet port 1 or the tank port 1-, and the pilot oil flowing into the back pressure chamber from the orifice is passed through the passage. In the spool position control device, the spool position control device is configured to cause the flow to flow from between the opening of the input lot and the tip end of the input lot to the outlet port 1 or the tank port, and controls the position of the spool to follow the input lot. The input rod is
It is slidably inserted into the sliding hole of the valve body, and its tip protrudes into the back pressure chamber, and the tip and the opening of the spool form a first j. An operating rod is provided that protrudes from the beech body, an oil chamber is formed between the sliding hole and the input rod, and a passage is provided in the input rod for guiding the pressure of the opening of the spool to the oil chamber. A high-speed spool position control device characterized by: 2. The high-speed spool position control device according to claim 1, wherein the tip diameter (D4) of the karod is made larger than the diameter (D1) of the main body portion fitted into the sliding hole. . 3. The high-speed spool position control device according to claim 1, characterized in that the tip diameter (D4) of the karod is made smaller than the diameter (D+) of the main body that fits into the sliding hole. . 4. The high-speed spool position control device according to claim 1, wherein the tip diameter (D4) of the 4-person spool 1- is made equal to the diameter (D1) of the main body portion fitted into the sliding hole. . 5 The person Karod is located between the main body and the operating lot.
It has a large diameter part that is thicker than the diameter (D4) of the main body part, and is guided to the oil chamber in an area formed by the difference between the diameter (D3) of the large diameter part and the diameter (D2) of the operating rod. Claims 2 to 4 are characterized in that an oil chamber formed by a difference in diameter between the large diameter portion and the main body portion is connected to a tank port. The high-speed spool position control device described in . 6 The shape of the tip of the Karod and the opening of the spool,
As the two approach each other until they reach a formal position of relationship,
”-The opening amount of the orifice formed by both of the above is gradually or stepwise reduced toward the normal opening amount. High speed spool position control device as described. 7. The high-speed spool position control device according to any one of claims 1 to 6, wherein the spool is a substantially equal area spool. 8. The high-speed spool position control device according to any one of claims 1 to 6, wherein the spool is a poppet-type spool. 9. The high-speed spool position control device according to any one of claims 1 to 8, wherein the spool is biased in one direction by a spring provided in the back pressure chamber. Official proceedings document (white side, January 21, 1986, Michibe Uga, Commissioner of the Patent Office, 1, Indication of the case, Patent Application No. 1988-11.2209, 2, Title of the invention, High-speed spool position control device, 3, Amendment) Relationship with the case of a person who does
Tokyo Keiki 4, Agent 1-20-5 Higashiikebukuro, Toshima-ku, Tokyo (1) Detailed explanation of the invention in the specification (2) Brief explanation of the drawings in the specification (3) Drawings 6. Contents of the amendment (1) The following statement is inserted between lines 17 and 18 on page 16 of the specification. 7a, if the gap between the outer diameter of the input lock 1 and the cylindrical surface C of the spool 61 is reduced to create a snug fit, the spool 6
1 is positioned so that the forming orifice 60' formed by the end corner d and the tapered part of the input rod 38 is shaped like the orifice 60. In this case, there is a considerable distance between the tip of the input rod 38 and the bottom surface of the cylindrical surface portion C, and there is no fear of collision. Further, by providing a notch or the like at the tip of the input rod 38, it is possible to further slow down the speed change during positioning. (2) The following statement is inserted between lines 19 and 20 of page 18 of the same book. Figure 7a is an enlarged explanatory view of the main parts showing some examples of the same parts as in Figure 7.'' (3) Between Figure 7 J and ``Figure 8'' on the same side, Figure I of the attached drawing is attached. Figure 7a is added. that's all

Claims (1)

[Claims] 1. A spool that continuously adjusts the opening degree depending on the position between an inlet port and an outlet port formed in a valve body;
an input rod for controlling the position of the spool, the pressure of the inlet port or the pilot oil pressure supply port is applied to one side of the spool, and the other side is exposed to the back where the spool is stored. Pilot oil is allowed to flow into the pressure chamber from the inlet port or pilot oil pressure supply port through an orifice, and the spool is provided with a passage that opens into the back pressure chamber and communicates with the outlet port or tank port, and the orifice The pilot oil flowing into the back pressure chamber is configured to flow out from between the opening of the passage and the tip of the input rod to the outlet port or the tank port, and the spool is made to follow the input rod. In the spool position control device that controls the position by
It is slidably inserted into the sliding hole of the valve body, and its tip protrudes into the back pressure chamber, and the tip and the opening of the spool form an orifice. is provided with an operating rod protruding from the outside of the valve body, an oil chamber is formed between the sliding hole and the input rod, and a passage is provided in the input rod to guide the pressure of the opening of the spool to the oil chamber. A high-speed spool position control device characterized by: 2. The high-speed spool position control device according to claim 1, wherein the input rod has a tip diameter (D_4) larger than a diameter (D_1) of the main body portion that fits into the sliding hole. . 3. The high-speed spool position control device according to claim 1, wherein the input rod has a tip diameter (D_4) smaller than a diameter (D_1) of the main body portion that fits into the sliding hole. . 4. The high-speed spool position control device according to claim 1, wherein the input rod has a tip diameter (D_4) equal to a diameter (D_1) of the main body portion that fits into the sliding hole. 5. The input rod is located between the main body and the operating rod,
It has a large diameter part that is thicker than the diameter (D_4) of the main body part, and is guided to the oil chamber by the area formed by the difference between the diameter (D_3) of the large diameter part and the diameter (D_2) of the operating rod. Claims 2 to 4 are characterized in that an oil chamber formed by a difference in diameter between the large diameter portion and the main body portion is connected to a tank port. The high-speed spool position control device according to any one of the above. 6 Adjust the shape of the tip of the input rod and the opening of the spool,
As the two approach each other until they reach a formal position of relationship,
Claims 1 to 6 are characterized in that the opening amount of the orifice formed by both of the above is gradually or stepwise reduced toward the normal opening amount.
3. The high-speed spool position control device according to any one of paragraphs. 7. The high-speed spool position control device according to any one of claims 1 to 6, wherein the spool is a substantially equal area spool. 8. The high-speed spool position control device according to any one of claims 1 to 6, wherein the spool is a poppet-type spool. 9. The high-speed spool position control device according to any one of claims 1 to 8, wherein the spool is biased in one direction by a spring provided in the back pressure chamber.