JPH0341179Y2 - - Google Patents

Description

[Detailed description of the invention] The invention controls fluid pressure and
The present invention relates to an electrohydraulic valve in which various pressure control characteristics can be set even after a fluid pressure control section and a solenoid section are coupled.

[Prior Art] A conventional electromagnetic hydraulic valve is shown in FIG. This electrohydraulic valve has a spool 11e inserted into a shaft hole 100e of a housing 10e with a biasing member 12e interposed therebetween.
A fluid pressure control section 1e that accommodates a fluid pressure control section 1e is connected to the fluid pressure control section 1e by a caulking method, and by applying a voltage, it attracts the first spool 11e against the urging force of the urging member 12e. It consists of a solenoid part 2e. In addition, the conventional electrohydraulic valve has an attractive magnetic force F in the direction of arrow S2 of the solenoid portion 2e.
and the urging force of the urging member 12e in the direction of arrow S1.
The spool 11e is moved to a position where the interaction force between the FS and the control fluid pressure FP acting as a feedback pressure on the control pressure chamber 106e from the control fluid introduction hole 103e is balanced. The fluid pressure is controlled by the amount of movement of the spool 11e corresponding to the current value A applied to the solenoid part 2e, and the fourth
The pressure control characteristic Pa as shown in the figure is obtained. or,
When the biasing force of the biasing member 12e is constant, the pressure control characteristic Pa is determined between the large diameter _D1 portion of the spool 11e on which the feedback pressure FP acts and the small diameter portion.
D Varies depending on the difference in pressure receiving area between _{the two} parts.

[Problems to be solved by the invention] The conventional electromagnetic hydraulic valve has a fluid pressure control section 1e.
and the solenoid part 2e are connected by a caulking part E obtained by caulking one end of the cover part 22e of the solenoid part 2e, and then the spool 11e is inserted into the housing 10e.
cannot accommodate. Further, in order to change the pressure control characteristic Pa, it is not possible to replace the spool with another spool having a different pressure receiving area on which the feedback pressure of the control fluid acts.

Therefore, in order to set the pressure control characteristic Pa to a desired value, various spools 11e with different pressure receiving areas are connected in advance to the fluid pressure control section 1e and the solenoid section 2e. Shaft holes 10 each housing a spool 11e
It is necessary to prepare the housing 10e with various types of housings 10e having a diameter of 0e, and to select and use combinations of the various spools 11e and housings 10e.

Therefore, when the pressure control characteristic Pa of the conventional electrohydraulic valve is set variously, the housing 10e of the fluid pressure control section 1e cannot be used in common.
Further, a large number of fluid pressure control units 1e, each of which is a combination of a spool 11e and a housing 10e, are required. or,
When the fluid pressure control section 1e and the solenoid section 2e are connected by caulking, the spool 11e compresses the biasing member 12e and is housed in the housing 10e with the biasing member 12e interposed therebetween, so that the connection is completed by caulking the two. Until then, it must be held at the fixed assembly position against the biasing force of the biasing member 12e, resulting in poor assembly performance.

An object of the present invention is to provide an electrode hydraulic valve in which the spool can be freely accommodated in the housing even after the fluid pressure control part is connected to the solenoid part, and various pressure control characteristics can be set.

[Means for Solving the Problems] The electrode hydraulic valve of the present invention has a shaft hole that is open at one end, a pressure fluid introduction hole and a pressure fluid outlet hole that communicate through the shaft hole, and a control fluid introduction hole that communicates with the shaft hole. a control valve that is slidably held in the shaft hole and controls communication between the pressure fluid inlet hole and the pressure fluid outlet hole; and a control pressure chamber that communicates with the control fluid introduction hole in the shaft hole. a fluid pressure control section consisting of a spool having a piston portion and a biasing member held in the housing that biases the spool in one axial direction; In an electrohydraulic valve comprising a solenoid section that attracts and biases against a biasing force, the housing includes a housing body having the shaft hole, and a ring fixed to the shaft hole of the housing body and in sliding contact with the piston section of the spool. It is characterized by consisting of a shaped cylinder part.

[Operations and effects of the invention] In the case of the electrohydraulic valve of the invention, the housing of the pressure control unit includes a housing body having a shaft hole, and a ring-shaped cylinder fixed to the shaft hole of the housing body and in sliding contact with the piston portion of the spool. It consists of a department.

Therefore, even in the case of a method in which the fluid pressure control section is coupled to the solenoid section by caulking the cover section of the solenoid section, after the fluid pressure control section and the solenoid section are coupled by the caulking method, the spool can be assembled from the other end of the shaft hole.

That is, a ring-shaped cylinder portion whose inner diameter corresponds to the diameter of the piston of the spool on which the pressure-controlled feedback pressure of the fluid acts is fixed in the shaft hole of the housing. At the same time, a spool is attached to the ring-shaped cylinder portion. One of the many spools with various pressure receiving areas and the ring-shaped cylinder portion is used as a unit, and a unit freely selected from among various types can be assembled.

Therefore, in the case of the electrohydraulic valve of the present invention, the housing of the liquid pressure control section can be used in common.
Furthermore, it is possible to freely adapt to various pressure control characteristics. Furthermore, ease of assembly can be improved by setting the spool and ring-shaped cylinder part into the shaft hole of the housing after the housing is connected to the solenoid part.

[Embodiment] An embodiment of the electromagnetic hydraulic valve of the present invention will be described based on FIG. 1, which shows a longitudinal section, and FIGS. 2 and 3, which show main parts in exploded perspective view.

An embodiment of the electromagnetic hydraulic valve of the present invention has a liquid pressure control section 1 and a solenoid section 2 as its constituent elements, as shown in FIG.

The fluid pressure control section 1 includes a housing 10, a spool 11, and a biasing member 12.

The housing 10 includes a housing main body 10a having a shaft hole 100, and a piston portion 112b of a sub-spool 11b which is fixed to the shaft hole 100 and will be described later.
and a ring-shaped cylinder portion 10b in sliding contact with each other. Further, the housing 10 is coupled to the solenoid part 2 by a caulking part E obtained by caulking one end of the cover part 22 of the solenoid part 2, which is attached to the opening 100a side.

The housing body 10a also has a shaft hole 100 with an opening 100a at one end, a pressure fluid introduction hole 101 that communicates with the shaft hole 100, a pressure fluid outlet hole 102, a control fluid introduction hole 103 that communicates with the shaft hole 100, and a first drain. It has a hole 104 and a second drain hole 105. The pressure fluid introduction hole 101 is connected to a pressure supply source (not shown), such as a hydraulic pump. or,
The pressure fluid outlet hole 102 is connected to a connection passage (not shown) that guides the pressure-controlled fluid to the point of use. The control fluid introduction hole 103 communicates with the control pressure chamber 106 in order to cause a part of the pressure-controlled liquid to act on a piston portion 112b of the sub-spool 11b, which will be described later. The first drain hole 104 and the second drain hole 105 also communicate with a first discharge passage and a second discharge passage (not shown) that return a portion of the pressure-controlled fluid to the reservoir. Further, the housing main body 10a has an opening 100b at one end of the shaft hole 100, and an opening 100b at the other end for inserting the ring-shaped cylinder part 10b.
It has a lid part 13 that closes 0b. Further, on the other end opening 100b side of the shaft hole 100, a female thread 110b is provided for screwing the lid portion 13 into the other end opening 100b in a freely attachable/detachable manner. The lid portion 13 has a recess 131 on which one end of the biasing member 12, which will be described later, is seated.
, a male screw 132 that is screwed into the female screw 110b of the other end opening 100b, and a flange 133 that controls the amount of screwing movement of the male screw 132 by coming into contact with the end of the housing body 10a. .
The ring-shaped cylinder portion 10b is the housing body 10
It has an outer peripheral surface 102b having a larger diameter than the shaft hole 100 fixed in the shaft hole 100 of a, and an inner peripheral surface 101b with which the piston portion of the sub-spool 11b slides. A plurality of ring-shaped cylinder portions 10b having different inner diameters are prepared in advance. In this example,
For example, a ring-shaped cylinder portion 10b having a large inner diameter d ₁ as shown in FIG. 2 and a ring-shaped cylinder portion 10b having a small inner diameter d ₂ as shown in FIG. 3 are prepared. In this case, the outer diameters D ₁ and D ₂ of the ring-shaped cylinder portion 10b shown in FIGS. 2 and 3 are the same size. In this example, two types of inner diameters d ₁ and d ₂ are used.
Although the ring-shaped cylinder portion 10b is shown, the present invention is not limited to this, and it is also possible to prepare a plurality of ring-shaped cylinder portions 10b whose inner diameters are changed in multiple stages. Moreover, the ring-shaped cylinder part 10b
is installed by inserting it into the shaft hole 100 from the other end opening 100b side of the housing main body 10a,
Can be fixed.

The spool 11 consists of a main spool 11a and a sub-spool 11b. The main spool 11a is slidably held in the shaft hole 100, and has a first control valve 111a that controls communication between the pressure fluid introduction hole 101 and the pressure fluid outlet hole 102, and a first control valve 111a that controls communication between the pressure fluid introduction hole 101 and the pressure fluid outlet hole 102.
and a second drain hole that controls communication with the first drain hole 104.
It has a control valve 111b.

The sub spool 11b is independent from the main spool 11a. This secondary spool 11 has a biasing member 12
The main spool 11a has a piston portion 112b that is biased by the main spool 11a. The piston part 112b is slidably held on the inner circumferential surface 101b of the ring-shaped cylinder part 10b inserted and fixed into the shaft hole 100 of the housing 10, and the control pressure is communicated with the control fluid introduction hole 103 in the shaft hole 100. A chamber 106 is formed. In this case, one end 11 of the sub spool 11b
The 3b side is a portion that comes into contact with the other end 114a of the main spool 11a. Further, the other end 114b side of the sub-spool 11b becomes a portion on which the feedback pressure FP of the pressure-controlled fluid and the biasing force FS of the biasing member 12 act. The sub spool 11b is the ring-shaped cylinder portion 10 shown in FIG. 2 or 3.
A large outer diameter D ₃ as shown in FIG _. 2 or a small outer diameter D ₄ as shown in FIG. 3 is formed in accordance with the large inner diameter d ₁ or small inner diameter d 2 of b. Further, the outer diameter of the piston portion 112b is not limited to two types, large and small, but if necessary, piston portions with different outer diameters may be used in combination with the ring-shaped cylinder portion 10b having inner diameters that are different in multiple steps. can do. Note that the fluid chamber 113 formed between the main spool 11a and the sub spool 11b is connected to a communication passage 1 bored in the axial center of the main spool 11a.
11c communicates with the second drain hole 105.

In the shaft hole 100 of the housing 10, the biasing member 12 includes a lid portion 13 that closes the other end opening 100b of the housing main body 10a, and the sub-spool 1.
1b and is arranged in a compressed state. As a result, the biasing member 12 pushes the main spool 11a and the sub spool 11b in one axial direction (arrow S1 direction).
to energize. Note that a push spring can be used as the biasing member 12. Further, the biasing member 12 is configured to apply feedback pressure FP acting on the sub spool 11b.
In addition, the attractive magnetic force of the solenoid section 2, which will be described later,
It acts in a direction that opposes FI, and its biasing force FS is set in advance.

The conventional structure of the solenoid section 2 can be used as is. In this embodiment, an annular coil portion 21, a cover portion 22 made of magnetic material, a pair of first yokes 23 and second yokes 24 made of magnetic material,
It is composed of an electromagnetically actuated spool 25 made of a magnetic material.

The solenoid section 2 attracts and urges the spool 11 against the acting force of the urging member 12, so that the solenoid section 2 closes the opening 10 at one end of the housing 10 of the fluid pressure control section 1.
It is coupled to the housing 10 by a caulked portion E that abuts on the 0a side and is caulked with a portion of the cover portion 22 covering the flange portion 10d.

The annular coil portion 21 is provided with a central hole 210 . The annular coil portion 21 includes a coil bobbin 212 that covers the inner peripheral surface and both ends of the coil 211, and an electric cord 212a connected to the coil bobbin 212.
and 212b, both electrical cords 212a
and 212b to generate magnetic lines of force.

The cover part 22 covers and protects the outer periphery of the coil part 21, and as mentioned above, by caulking the flange part 10d of the housing 10 with a part of the cover part 22, the solenoid part 2 and the fluid pressure control part 1 are connected to each other. are combined. Further, the cover part 22 forms part of a loop-shaped magnetic path together with a first yoke 23 and a second yoke 24, which will be described later, by lines of magnetic force generated from the annular coil part 21.

The pair of first yokes 23 and second yokes 24 are made of a magnetic material, and are disposed at both ends of the center hole 210 of the annular coil portion 21 at intervals. The first yoke 23 and the second yoke 24 form a part of a loop-shaped magnetic path together with the cover section 22 described above by the lines of magnetic force generated in the annular coil section 21, and act as electromagnets. When acting as an electromagnet, the spool 25 is attracted. Further, the tip 251 of the electromagnetic actuation spool 25 on the suction movement side is connected to one end 113 of the main spool 11a of the fluid pressure control section 1.
It is in contact with a. This electromagnetically actuated spool 25 is always urged in the direction of arrow S1 by the urging force FS of the urging member 12.

In the embodiment of the present invention, by setting in advance the pressure receiving area of the piston portion 112b of the sub spool 11b where a portion of the control pressure fluid acts as feedback pressure, various pressure control characteristics Pa can be controlled.
is obtained.

That is, in this case, after the pressure control section 1 is caulked and coupled to the solenoid section 2, the spool 11 is inserted into the shaft hole 100 from the other end opening 100b of the housing main body 10a with the lid section 13 removed.
In that state, the ring-shaped cylinder part 10b with a large inner diameter d ₁ shown in FIG. 2 or the ring-shaped cylinder part 1 with a small inner diameter d ₂ shown in FIG.
0b is inserted into the shaft hole 100. In this case, the ring-shaped cylinder part 10b with the large inner diameter _d1 is combined with the sub spool 11b with the large outer diameter _D3 , and the ring-shaped cylinder part 10b with the small inner diameter _d2 is combined with the ring-shaped cylinder part 10b with the small outer diameter D. _Four sub spools 11b are combined. Thereafter, with the biasing member 12 interposed between the sub spool 11b and the lid 13, the lid 13 is moved to the other end opening 1.
00b, the housing 10 of the ring-shaped cylinder part 10b and the sub-spool 11b
The assembly can be completed.

Therefore, in this embodiment, even after the housing 10 of the fluid pressure control section 1 and the solenoid section 2 are connected, the sub spool 11b having an arbitrary pressure receiving area on which the feedback pressure acts is attached to the axis of the housing 10. It can be assembled into the hole 100.

Therefore, the attraction magnetic force FI due to the generation of magnetic force of the solenoid section 2, the feedback pressure FP acting on the main spool 11a and the sub spool 11b of the fluid pressure control section 1, and the urging member acting on the main spool 11a and the sub spool 11b. 12 force FS
The positions of the main spool 11a and the sub spool 11b where the three acting forces are balanced can be varied in various ways. And when the pressure is controlled by the ratio of the opening areas of the land parts A and B of the fluid pressure control part 1,
The pressure control characteristic Pa shown in FIG. 4 can be varied in various ways.

Furthermore, a housing 10 of the fluid pressure control section 1;
After the solenoid part 2 is coupled with the solenoid part 2 by caulking, the other end opening 10 of the shaft hole 100 of the housing 10 is opened.
Main spool 11a and sub spool 11b from 0b
By installing this, the assembly performance will be improved.

The electrohydraulic valve of this embodiment operates as described below. This electrohydraulic valve is used by being incorporated into a pressure fluid circuit of a pressure fluid usage device (not shown). When using it, pressurized fluid introduction hole 1
01 is supplied with pressure fluid. If the solenoid part 2 is not energized here, the main spool 11a and the sub spool 11b of the fluid pressure control part 1
The electromagnetic actuating spool 25 and the like of the solenoid section 2 are positioned as shown in FIG. 1 by the acting force FS of the biasing member 12. Moreover, the pressure fluid introduction hole 101 and the second drain hole 105 are closed by the first control valve 111a and the second control valve 111b of the main spool 11a. From this state, the annular coil portion 21
When a magnetic force is generated by passing a current through, the electromagnetically actuated spool 25 is attracted in the direction of arrow S2. The attractive magnetic force FI of the solenoid section 2 is transmitted from the electromagnetically actuated spool 25 to the main spool 11a and the sub spool 11b of the fluid pressure control section 1. Then, the main spool 11a and the sub spool 11b
moves in the direction of arrow S2 from the position shown in FIG. 1 against the biasing force FS of the biasing member 12. At the same time, the pressure fluid introduction hole 10 is controlled by the first control valve 111a and the second control valve 111b of the main spool 11a.
1 and the pressure fluid outlet hole 102 and communication between the pressure fluid introduction hole 101 and the second drain hole 105 are controlled. These control amounts are determined by the applied voltage, the biasing force FS of the biasing member 12, and the feedback pressure FP of the control fluid acting on the sub spool 11b from the pressure fluid outlet hole 102 and the control fluid introduction hole 103. It is determined by the position of the main spool 11a that has stopped after moving. The difference between the flow rate of the pressure fluid introduced from the pressure fluid introduction hole 101 controlled by the first control valve 111 of the main spool 11a and the flow rate of the pressure fluid drained from the first drain hole 104 through the shaft hole 100. The pressure becomes a fixed control pressure and is led out to the pressure fluid outlet hole 102. In addition, the amount of pressure fluid flowing out into the pressure fluid outlet hole 102 changes depending on the amount discharged from the first drain passage 104. At the same time, a part of the pressure fluid flowing out from the pressure fluid introduction hole 102 flows into the control pressure chamber 106 from the control fluid outlet hole 103, and acts on the sub spool 11b in the biasing direction of the biasing member 12. The so-called feedback pressure FP is defined. In this case the specified feedback pressure
FP acts together with the biasing force FS of the biasing member 12 in the direction of arrow S1 in FIG. The positions of the spool 11a and the sub-spool 11b are determined.

Therefore, the control pressure value P of the fluid pressure control section 1 is determined for the current value IA energized to the solenoid section 2,
In addition, a pressure control characteristic Pa as shown in FIG. 4 is obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the electrohydraulic valve of the present invention. Figures 2 and 3 are the first
It is an external perspective view which disassembles and shows the sub spool 11b of the electrohydraulic valve shown in the figure, and the ring-shaped cylinder part 10b. FIG. 4 is a diagram showing the pressure control characteristic PA of the control pressure P of the pressure fluid with respect to the current value IA of the embodiment of the present invention and the conventional electromagnetic hydraulic valve. FIG. 5 is a longitudinal sectional view showing the configuration of a conventional electrohydraulic valve. 1... Fluid pressure control section, 10... Housing,
10b...Ring-shaped cylinder part, 11...Spool, 12...Biasing member, 11a...Main spool,
11b... Sub-spool, 100a... One end open,
100b...Other end opening, 13...Lid part, 2...Solenoid part.

Claims (1)

[Claims for Utility Model Registration] (1) A housing having a shaft hole opened at one end, a pressure fluid introduction hole and a pressure fluid outlet hole communicating through the shaft hole, and a control fluid introduction hole communicating with the shaft hole; , a control valve that is slidably held in the shaft hole and controls communication between the pressure fluid introduction hole and the pressure fluid outlet hole, and a control pressure chamber that communicates with the control fluid introduction hole in the shaft hole. a fluid pressure control unit comprising a spool having a piston portion and a biasing member held within the housing and biasing the spool in one axial direction; In an electromagnetic hydraulic valve comprising a solenoid portion that attracts and urges the spool against the urging force of the urging member, the housing includes a housing body having the shaft hole, and the housing is fixed to the shaft hole of the housing body and is fixed to the shaft hole of the housing body. An electromagnetic hydraulic valve comprising a ring-shaped cylinder portion in sliding contact with the piston portion of the spool. (2) The spool is comprised of a main spool having the control valve, and a sub-spool that is independent of the main spool and is brought into contact with the main spool by the biasing member, and has the piston portion. The electrohydraulic valve according to item 1. (3) The electromagnetic hydraulic system according to claim 1, wherein the housing body has an opening at the other end into which the cylinder section is inserted into the other end of the opening at one end, and a lid section that closes the opening at the other end. valve.