JP2571254Y2 - Pressure reducing valve - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pilot-operated, pressure-reducing valve of a modular stack type with a relief.

[0002]

2. Description of the Related Art A pilot-operated pressure-reducing valve with a relief is well known, for example, as shown in FIG. 4 on page 15 of Vol. 13, No. 4, Issued April 1, 1975. Referring to FIG. 8, the main valve spool C is urged to the normal position by the spring D in the valve hole B of the main body A and is accommodated in the axial direction so as to be movable in the axial direction. A pilot chamber E and a spring chamber F are formed. An inlet G and an outlet J of a supply path for supplying pressure oil are connected to the valve hole B, and a relief outlet K is formed in the valve hole B. The inlet G, the outlet J, and the relief outlet K are not shown. Are connected to the hydraulic pressure source, the actuator, and the tank, respectively. A pilot pressure is led from the outlet J of the supply path to the pilot chamber E by a passage L and a spring N to a spring chamber F by a passage N having a throttle M. The spring chamber F is connected to a pilot relief valve P. I have.

[0003] As shown in the figure, the main valve spool C is urged by the bias of a spring D.
Is in the normal position at the lower end, the control land C1 of the main valve spool C opens between the introduction portion G and the outlet portion J, and closes between the introduction portion G and the relief outlet portion K. When the pressure of the pressure oil supplied from the hydraulic source connected to the outlet to the actuator connected to the outlet J rises, the pilot relief valve P opens to perform pressure control so as to maintain the inside of the spring chamber F at the set pressure. The main valve spool C is pivoted so that the downward pressing force on the spring chamber F side by the action of the urging force of the spring chamber F and the pressure of the spring chamber F and the upward pressing force by the pressure action of the lead-out section J led to the pilot chamber E are balanced. A pressure control action moving in the direction is performed. At this time, the spring chamber F
If the pressure of the outlet portion J is larger than the downward pressing force on the side, the main valve spool moves upward in the direction to close between the inlet portion G and the outlet portion J by the control land C1, and the inlet portion G and the outlet portion are moved. J is further narrowed to reduce the pressure of the outlet portion J. If the pressure of the outlet portion J is smaller than the downward pressing force on the spring chamber F side, the main valve spool C moves downward and the control is performed. The land C1 further opens the inlet G and the outlet J to increase the pressure of the outlet J to maintain the pressure of the outlet J at a substantially constant pressure based on the set pressure of the pilot relief valve P. When the space between the inlet portion G and the outlet portion J is closed by raising the valve spool, or in the vicinity thereof, the space between the outlet portion J and the relief outlet portion K is opened by the control land C1. Just closing the part J Can not Rukoto, surge pressure rise in the outlet portion J side can be favorably suppressed.

[0004]

DISCLOSURE OF THE INVENTION The present inventors have studied the construction of such a pressure reducing valve with a relief as a modular stack type valve. The modular stack type valve has a supply passage connected to the hydraulic pressure source to supply the pressurized liquid, an output passage connected to the actuator, and a return passage connected to the tank. It can be used in a stacked relationship with other modular stack type valves or switching valves by interposing a valve mechanism in these passages or between the passages. In such a modular stack type valve, since the type of each passage provided in the main body is standardized, the relief lead-out portion K in FIG. 8 needs to be internally connected to the return passage instead of being an independent passage. With this, a problem has been clarified in that it becomes necessary to drill a through hole in the main body for connecting the relief lead-out portion K and the return passage, and the processing becomes complicated. The present invention solves such problems.
The present invention realizes a pressure-reducing valve with a relief in a modular stack type in which a relief lead-out portion can be connected to a return passage without requiring special drilling.

[0005]

According to the present invention, there are provided a main body, a supply passage having an inlet portion opened on a lower surface, and an outlet portion opened on an upper surface, and two output passages connected to an actuator. Two return passages connected to the tank are provided on the upper and lower surfaces of the main body, respectively, and the openings of the respective passages on the upper and lower surfaces of the main body are provided on both sides of the supply passage in the longitudinal direction of the main body. The openings of the output passages are sequentially spaced from each other, and the openings of the two output passages are aligned in the longitudinal direction of the main body.The openings of the supply passage and the two return passages are separated from the alignment line of the two output passages in the width direction of the main body. It is arranged so as to be aligned in the longitudinal direction, and the axis is arranged along the longitudinal direction of the main body between the opening alignment line of these two output passages and the opening alignment lines of the supply passage and both return passages, so that the valve hole and the pilot chamber can be connected. Pa A pilot hole for introducing the lot pressure is provided in the main body with the pilot hole facing upward, and one return passage is provided with a cross bulging portion bulging in the main body width direction so as to cross the valve hole in the main body. The relief bulging portion opened to the valve hole is formed by the cross-bulging portion.

[0006]

According to the above construction, the one return passage is directly connected to the valve hole by the cross bulge provided therein intersecting the valve hole, and the cross bulge itself is the relief portion protrusion. Therefore, it is not necessary to separately drill a through hole for connecting the relief lead-out portion and the return passage.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.
1 to 5, reference numeral 1 denotes a main body, a supply passage 2 having openings on an upper surface 1A and a lower surface 1B thereof, and two output passages 3, 4.
And two return passages 5 and 6 are formed through. Further, the main body has four mounting holes 7 for inserting mounting bolts and two pilot passages 8 and 9 formed in the lower surface 1B by opening 1A and penetrating therethrough. In the longitudinal direction of the main body 1, the openings of the output passages 3 and 4 and the openings of the return passages 5 and 6 are sequentially arranged on both sides of the opening of the supply passage 2 on the upper and lower surfaces 1A and 1B. Further, in the upper and lower surfaces 1A, 1B of the main body 1, the openings of the two output passages 3, 4 are arranged with their centers aligned in the longitudinal direction of the main body 1, and the output passages 3, 4
The openings of the supply passage 2 and the output passages 5 and 6 are arranged such that their centers are aligned in the longitudinal direction of the main body 1 so as to be separated from the opening alignment line 4 and the width direction of the main body 1.

Numeral 10 denotes a valve hole, which is an alignment line between the output passages 3 and 4 in the longitudinal direction of the main body 1 in the longitudinal direction of the main body 1 and the supply passage 2 and the return passages 5 and 6 in the longitudinal direction of the main body 1. The main valve spool 11 is provided in the longitudinal direction of the main body 1 with an axis placed in the middle of the opening alignment line to the main body 1. Numeral 12 designates the main valve spool 11 in the normal position shown in FIG.
The main valve spool 11 has end lands 11A and 11B at both ends and control lands 11C in the middle thereof, and both ends of the main valve spool 11 are provided in the valve hole 10. A spring chamber 13 in which the spring 12 is installed
, A pilot chamber 14 is formed opposite to this. Reference numeral 15 denotes a passage provided in the main valve spool 11 so as to communicate the pilot chamber 14 with the spring chamber 13 and provided with a throttle 16.

The supply passage 2 is formed by separating an introduction portion 2A opening on the lower surface 1B of the main body 1 and an outlet portion 2B opening on the upper surface 1A of the main body 1 in the axial direction with the outlet portion 2B on the pilot chamber 14 side. 2A and 2B, and a part of the valve hole 10 to which they are connected. The return passage 5 has one return passage 5 as shown in FIGS. A cross-bulging portion 5A bulging in the width direction of the main body 1 in the main body 1 so as to intersect with the valve hole 10 is formed together with the return passage 5 by casting, and a relief lead-out portion opened to the valve hole 10 by the cross-bulging portion 5A. 17 are formed. At the normal position in FIG. 2, the control land 11C of the main valve spool 11 opens between the outlet 2B and the inlet 2A of the supply passage 2 and closes between the outlet 2B and the relief outlet 17. At the same time, the main valve spool 11 moves toward the spring chamber 13 against the urging force of the spring 12 to close the space between the outlet 2B and the inlet 2A of the supply passage 2. The size is set so as to open between the two.

Reference numeral 18 denotes a pilot hole, like the valve hole 10, both output passages 3 in the upper and lower surfaces 1A and 1B of the main body 1.
4 and the supply line 3 and the two return passages 5 and 6, the axis of which is aligned with the longitudinal opening alignment line of the main body 1, and the valve hole 10 above the valve hole 10. Are provided in the main body 1 in a parallel shape. And this pilot hole 1
8 is connected to the pilot chamber 14 through through holes 19 and 20, and through a through hole 21 as shown in FIGS.
It is connected to the outlet 2B of the supply passage 2.

Reference numeral 22 denotes a pilot relief valve,
A valve body 26 seated by the urging force of a pressure regulating spring 25 on a valve seat 24 provided at a step portion of a diameter-enlarged hole 23 connected to the spring chamber 1.
3 is connected. Numeral 27 is an adjusting screw for adjusting the urging force of the pressure adjusting spring, and the liquid discharged from the pilot relief valve 22 is guided to the return passage 6 through the through holes 28 and 29.

[0012] Such a pressure reducing valve is used, for example, as shown in FIG. That is, the main body 1 is stacked on the manifold M by stacking the switching valve V on the upper part, and the outlet 2B of the supply passage 2 that opens on the upper surface 1A of the main body 1, the output passage 3,
4, return passages 5 and 6, and pilot passages 8 and 9 include a supply passage P, outlet passages A and B provided in the switching valve V, a return passage R1,
R2 and pilot paths PL1 and PL2, respectively. In addition, each of these passages opened on the lower surface 1B of the main body 1 passes through a corresponding passage on the manifold M side, respectively.
The introduction portion 2A of the supply passage 2 is connected to the supply passage 30 of the manifold M.
And return passages 5 and 6 to tank 33 via return passage 32 of manifold M, output passages 3 and 4
Is connected to a cylinder 34 as an actuator, and the pilot passages 8 and 9 are connected to pilot solenoid valves 35 and 36 provided in a manifold M, respectively.

The operation of this embodiment will be described. In FIG. 5, assuming that the pilot solenoid valve 35 is switched and the switching valve V is switched to advance the cylinder 34, the pressure from the outlet 2B of the supply passage 2 is changed to the through hole 21, the pilot hole 18,
The air is guided to the pilot chamber 14 through the through holes 19 and 20 and further to the spring chamber through the throttle 16 of the passage 15. From the outlet 2 B, the air is guided to the cylinder 34 through the switching valve V and the output passage 4. When the pressure of the applied hydraulic fluid increases, the pilot relief valve 22 opens to control the pressure in the spring chamber 13 to a set pressure corresponding to the urging force of the pressure adjusting spring 25, whereby the spring chamber 13 and the throttle 16 are connected. Pilot room 1
4, the main valve spool 11 moves to the spring chamber 13 side, and the control land 11C causes the introduction portion 2A.
The pressure in the throttle lead-out section 2B is further reduced from that in the normal position in FIG. Then, the main valve spool 11 is pressed by the action of the pressure of the lead-out portion 2 </ b> B led to the pilot chamber 14 acting from the pilot chamber 14 side, the urging force of the spring 12 acting from the spring chamber 13 side, and the pressure of the spring chamber 13. It moves in the axial direction so as to balance the pressing force by the action of the pressure controlled by the pilot relief valve 22, and moves to the pilot chamber 14 side if the pressure of the outlet portion 2B decreases with respect to the pressing force from the spring chamber 13 side. Conversely, if it rises, the main valve spool 11 moves to the spring chamber 13 side, and the control land 11C further opens the space between the introduction portion 2A and the lead-out portion 2B, or moves between the introduction portion 2A and the lead-out portion 2B. By further reducing the pressure until the valve is closed, the pressure of the outlet portion 2B is controlled to a substantially constant pressure corresponding to the set pressure of the pilot relief valve 22, and the cylinder 34 is controlled to approximately one pressure under this pressure control. It moves forward in response to the hydraulic pressure.

When the pressure of the lead-out portion 2B rises in a surge-like manner when, for example, the cylinder 34 reaches the stroke end, the main valve spool 11 further moves toward the spring chamber 13 and its control land 11C becomes The space between the introduction unit 2A and the derivation unit 2B is closed, and the derivation unit 2B and the relief derivation unit 1 are closed.
7, the pressure fluid in the outlet portion 2B escapes to the return passage 5 and such surge pressure is suppressed. Further, the switching valve V is switched from the pilot solenoid valve 3 to the forward operation of the cylinder 34.
6, the cylinder 34 is connected to the main valve spool 11 in the same manner as described above.
It operates backward under pressure control by.

In this embodiment, the relief lead-out portion 17 of the valve hole 10 is provided in the cross passage 5 provided in the return passage.
A is formed so as to intersect with the valve hole 10, so that the relief lead-out portion 17 is directly provided without the need for drilling the main body 1.
Is connected to the return passage 5 so that machining of the main body 1 is reduced, and the main body can be manufactured at low cost.

Further, the valve hole 10 and the pilot hole 18 are
Opening alignment lines of the two output passages 3 and 4 in the longitudinal direction of the main body 1;
Since the supply passage 2 and the two return passages 5 and 6 are provided in the longitudinal direction of the main body 1 with an axis positioned in the middle of the alignment line of the main body 1 in the longitudinal direction, the width dimension of the main body 1 can be reduced, and a small decompression can be achieved. A valve is obtained.

The pilot hole 18 is connected to the outlet 2B of the supply passage 2 by a through hole 21 and the pilot pressure source is the outlet 2B. The through hole 21 connects the output passage 4 to the pilot hole 21. In this case, the output passage 4 is used as the pilot pressure source so that the main valve spool 11 is used only when the output passage 4 is connected to the outlet 2B of the supply passage 2 as in the case where the cylinder 34 moves forward in FIG. Pressure control can be obtained, and this pressure control
When the output passage 3 is to be obtained only when the output passage 3 is connected to the outlet portion 2B, such as when the cylinder 34 moves backward, the connection can be made by connecting the output passage 3 and the pilot hole 18 through the through hole 21.

Then, as described above, depending on the use, the through holes 21 are formed.
The pilot hole 1
8 is, as described above, an axis centered between the opening alignment line of the output passages 3 and 4 in the longitudinal direction of the body 1 and the opening alignment line of the supply passage 2 and the return passages 5 and 6 in the longitudinal direction of the body 1. Since it is placed, it can be dealt with by a slight change in drilling.

FIGS. 6 and 7 show another embodiment, and the points different from the previous embodiment will be described. The introduction part 2A and the lead-out part 2B of the supply passage 2 are provided in the opposite way to the previous embodiment. The return passage 6 which is connected to the valve hole 10 with the portion 2A facing the pilot chamber 14 is provided with a cross bulging portion 6A which intersects with the valve hole 10 on the opposite side from the previous embodiment, thereby providing relief. The lead-out part 17 is formed. The opening and closing between the inlet 2A and the outlet 2B of the supply passage 2 is controlled by the end land 11B of the main valve spool 11, and the end land 11A is controlled.
As a result, the outlet 2B of the supply passage 2 and the relief outlet 17
And the opening and closing of the spring chamber.
Reference numeral 3 denotes a portion for guiding the pilot pressure from the pilot hole 18 through the throttle 37A of the through hole 37 provided in the main body 1, and has the same operation and effect as the previous embodiment.

[0020]

As described above, according to the present invention, the relief lead-out portion that opens to the valve hole is formed by providing the return passage with the cross-bulging portion that intersects with the valve hole. This eliminates the need for drilling a through-hole connected to the return passage and the relief lead-out portion connected to the portion, thereby reducing machining on the main body and making the main body inexpensive.

Further, the valve hole and the pilot hole are formed such that an axis line is located between an alignment line where openings of both output passages are aligned in the longitudinal direction of the main body and an alignment line where openings of the supply passage and both return passages are aligned in the longitudinal direction of the main body. , So that the width of the main body can be reduced and a small-sized pressure reducing valve can be obtained, and the pilot pressure source connected to the pilot hole is changed between the outlet of the supply passage and each of the three output passages. Even in such a case, a slight change can be dealt with, and a change according to the application can be easily made at low cost.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along line AA in FIG. 1;

FIG. 3 is a sectional view taken along line BB in FIG. 1;

FIG. 4 is a partial cross-sectional view along the line CC in FIG. 1;

FIG. 5 is a hydraulic circuit diagram showing an example of use of the embodiment of the present invention.

FIG. 6 is a partial sectional front view showing a second embodiment of the present invention.

FIG. 7 is a sectional view taken along line DD in FIG. 6;

FIG. 8 is a longitudinal sectional view showing a conventional example.

[Explanation of symbols]

 1 main body 1A upper surface 1B lower surface 2 supply passage 2A supply passage introduction portion 2B supply passage leading portion 3, 4 output passage 5, 6 return passage 5A, 6A cross bulging portion 10 valve hole 11 main valve spool 12 spring 13 spring chamber 14 Pilot chamber 16, 37A throttle 17 Relief outlet section 18 Pilot hole 22 Pilot relief valve

Claims (1)

(57) [Scope of request for utility model registration] A main valve spool biased to a normal position by a spring is accommodated in a valve hole of a main body in an axially movable manner, and a spring chamber in which the spring is installed is opposed to the spring chamber. A pilot chamber to be guided is formed at both ends of the main valve spool, a pilot pressure is guided through a throttle to the spring chamber, and a pilot relief valve is connected.The pilot pressure is connected to a valve hole at a normal position of the main valve spool. The opening between the introduction portion and the outlet portion of the supply passage receiving the supply of the pressurized liquid is opened, and the main valve spool is moved against the bias of the spring to close the introduction portion and the outlet portion of the supply passage. In the pressure-reducing valve, which opens between the outlet and the relief outlet that opens to the valve hole and is guided to the tank, the main body includes a supply passage on the lower surface with the inlet on the lower surface, and the outlet with the upper surface on the upper surface. Open and act Two output passages connected to the heater and two return passages connected to the tank are provided on the upper and lower surfaces of the main body, respectively, and the openings of the respective passages on the upper and lower surfaces of the main body are formed in the supply passage in the longitudinal direction of the main body. The opening of the output passage and the opening of the return passage are arranged sequentially on both sides of the opening, and the openings of the two output passages are aligned in the longitudinal direction of the main body. The openings of the supply passage and the two return passages are arranged so as to be aligned in the longitudinal direction of the main body, and the axis extends along the longitudinal direction of the main body between the opening alignment line of the two output passages and the opening alignment line of the supply passage and the two return passages. A valve hole and a pilot hole for introducing pilot pressure into the pilot chamber are provided in the main body with the pilot hole upward, and one return passage is bulged in the main body width direction so as to cross the valve hole in the main body. And the intersection bulging portion provided, the pressure reducing valve formed by forming a relief deriving unit that opens the valve hole by the intersection bulging portion.