JPH0723664Y2 - Pressure control valve - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a pilot operated type pressure control valve, and more particularly to a pilot poppet and a check poppet slidably inserted therein, with respect to the axis of the valve body. And a pressure control valve configured to be movable in a predetermined range in a direction orthogonal to each other.

[Conventional technology]

Conventionally, as this type of pilot operated type pressure control valve, one having a configuration shown in FIG. 3 is known.

That is, in FIG. 3, reference numeral 10 denotes a sleeve which is a cylindrical valve body, and one end of the sleeve 10 is screwed to the body 12 and the pilot seat body 14 is provided at the other end opening. An integrally formed plug 16 is screwed on. A cylindrical check poppet 18 is slidably and liquid-tightly fitted around the outer periphery of the pilot seat body 14 and is housed inside the sleeve 10.

A spring chamber 20 is formed inside the plug 16 along the axis of the sleeve 10, and the spring chamber 20 communicates with a flow hole 22 formed at the tip of the plug 16. In addition, a sheet portion is formed on the inner end of the through hole 22 on the outlet side.
24 are formed.

Therefore, the pilot poppet 26 is installed in the spring chamber 20 and the pilot poppet 26 is attached to the spring 28.
Is pressed against the seat portion 24. Further, a protruding portion 30 having a conical tip is provided on the side of the pilot poppet 26 opposite to the contact side of the spring 28, and the protruding portion 30 is projected from the flow hole 22.

On the other hand, a relief poppet 31 is slidably inserted into the check poppet 18, and a piston poppet 32 is slidably inserted into the relief poppet 31.

Further, the piston poppet 32 is configured to be pressed by a spring 36 interposed between the piston poppet 32 and the pilot seat body 14, and at the same time, the relief poppet 31.
The tip end of the sheet is pressed against the seat portion 34 formed at the inner end of the check poppet 18.

The tip of the check poppet 18 is attached to the body.
The seat portion 38 formed in the inside 12 is configured to come into pressure contact with the urging force of the spring 36.

In this way, the pressure control valve composed of a large number of members prevents the leakage of the pressure oil, for example, with respect to the fitting portions where the members are fitted to each other and the portions which are closed by the pressure contact between the members, It is required to be assembled with sufficient concentricity, so that each component is processed with high precision.

However, for example, since the pilot seat body 14 is formed integrally with the plug 16, the spring chamber 20 to be excavated on the axial center of the pilot seat body 14 needs to be machined quite deeply and is formed in the seat portion 24. Since the diameter of the flow hole 22 is small, it is difficult to improve the processing accuracy of the seat portion 24.

Therefore, a pressure control valve improved so as to reduce the working depth of the spring chamber 20 and improve the working accuracy of the seat portion 24 by providing the pilot seat body 14 and the plug 16 as a separate structure is proposed. (Japanese Utility Model Publication No. 61-28546).

The above proposed pressure control valve separates the pilot seat body and the plug, processes the spring chamber and the seat portion, and then fits the pilot seat body into the cylindrical portion formed at the inner end of the plug, The cylindrical portion is configured to be plastically deformed along the concave portion formed on the outer periphery of the sheet body so that these are integrally coupled.

[Problems to be solved by the device]

However, as described above, by forming the plug in the separated structure, the processing accuracy of the pilot seat body can be improved, but the improvement of the processing accuracy of the individual members combined with the pilot seat body cannot be resolved. However, high processing accuracy is still required.

Therefore, the sheet body integrated by crimping requires a highly accurate concentricity even for a check poppet or the like combined with the sheet body, so that a jig or the like is required for the crimping work, and the number of assembling steps is increased. And the manufacturing cost also increase.

Therefore, an object of the present invention is to allow the pilot seat body to move within a predetermined range in a direction orthogonal to the axis of the valve body, together with a checkpoint slidably fitted therein. By storing and arranging the components inside the valve body, it is possible to easily align each of the components on the same axis line even if the machining accuracy with respect to the concentricity of each component is not sufficiently obtained, and the machining is easy. Another object of the present invention is to provide a pressure control valve capable of sufficiently securing hermeticity under a high pressure condition of hydraulic pressure.

[Means for Solving the Problems]

To achieve the above object, a pressure control valve according to the present invention comprises a plug (16) which is fixedly connected to one end of a valve body (10).
The pilot seat body (14) separated from the valve seat (14) is housed inside the valve body (10) and is slidably mounted on the outer periphery of the pilot seat body (14) in the axial direction of the valve body (10). The check poppet (18) to be fitted is assembled inside the valve body (10), and the check poppet (1
8) The pilot seat body (14) is slidably inserted into the opening portion at one end of 8), and a piston is provided inside for elastically pressing and abutting against the seat portion (34) at the other end. A pilot operated pressure control valve in which a relief poppet (31) incorporating a poppet (54) is slidably fitted, wherein a tip portion of a plug (16) is provided on an inner wall of the valve body (10). A hole (44) having a required step is provided adjacent to the check poppet (18) on the storage side, and a flange (14) fitted and locked in the hole (44) at one end of the pilot seat body (14). 48), a pilot poppet (26) for elastically pressing and abutting the other end sheet portion (24) of the pilot seat body (14) to close the seat is inserted, and the hole (44 ) Is provided with a predetermined gap (δ) in the radial direction. The pilot seat body (14) is configured so as to be movable within a predetermined range at least in a direction orthogonal to the axial direction of the valve body by fitting and locking the screw (48).

In this case, a predetermined gap (Δl) is provided in the hole (44) in the axial direction of the valve body (10), the flange (48) is fitted and locked, and the pilot seat body (14) is fixed. The valve body (10) can also be configured to move within a predetermined range in the axial direction.

[Action]

According to the pressure control valve of the present invention, the pilot seat body, together with the check poppet slidably fitted therein, can be moved within a predetermined range in a direction orthogonal to the axis of the valve body. By storing and arranging them inside the valve body, it is possible to easily align each of the components on the same axis even if the processing accuracy with respect to the concentricity of each component is not sufficiently obtained. It can be sealed liquid-tight without leaking even under conditions.

Further, by making the pilot seat body and the plug have a separate structure, the fitting gap of the sliding portion between the pilot seat body and the check poppet can be set to the minimum, and the seal member to be provided in this portion can be set. Can be omitted.

〔Example〕

An embodiment of the pressure control valve according to the present invention will be described below in detail with reference to the accompanying drawings. For convenience of explanation, the same components as those of the conventional configuration shown in FIG. 3 are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a sectional view of an essential part showing an embodiment of a pressure control valve according to the present invention. In the embodiment shown in FIG. 1, at one end of the sleeve 10 which is a cylindrical valve body, a plug 16 configured as a spring chamber 20a described later is liquid-tight in a through hole bored in the central axis direction. Is screwed to.

In the sleeve 10, the pilot seat body 14 separated from the plug 16 is housed and arranged with a slight gap Δl in the axial direction of the sleeve 10, and at the outer periphery of the pilot seat body 14. The check poppet 18 slidably inserted in the axial direction is the sleeve.
Installed within 10.

A spring chamber 20b is formed in the pilot seat body 14 at the axial center thereof by excavation. The spring chamber 20b communicates with the flow hole 22 opened at the end of the pilot seat body 14, and a seat portion 24 is formed at the inner end of the flow hole 22 on the spring chamber 20b side.

In the spring chamber 20b of the pilot seat body 14, there is incorporated a pilot poppet 26 having a tip protruding from the flow hole 22 and a conical portion formed at an intermediate portion thereof being liquid-tightly pressed against the seat portion 24. . The pilot poppet 26 is elastically biased in the axial direction of the sleeve 10 by a spring 28 in which the pressing force is adjustable by the adjusting screw 40 in the spring chambers 20a and 20b.

On the other hand, inside the sleeve 10, a required step portion 46 is provided for the end portion of the female screw 42 for screwing the plug 16 screwed at one end of the sleeve 10 to accommodate the check poppet 18. To configure. Therefore, a hole 44 is formed in the inner wall of the sleeve 10 adjacent to the tip of the screwed plug 16 and having a predetermined step with respect to the storage side of the check poppet 18. Therefore, the flange 48 formed on the pilot seat body 14 is fitted and locked into the hole 44. In this way, the pilot seat body 14 is restricted from moving in the axial direction by the spring 28 biased through the pilot poppet 26, but in this case, the plug 16
A degree of freedom is given to the movement in the axial direction with a predetermined gap Δl with respect to the end.

Further, the flange 48 formed on the pilot seat body 14
The outer shape of the above is configured such that a predetermined gap δ is provided in the radial direction with respect to the hole 44 so as to be fitted and locked. As a result, a degree of freedom is given to the movement of the pilot seat body 14 in the direction orthogonal to the axial direction of the sleeve 10 within the range of the gap δ.

A check poppet 18 is slidably fitted on the outer periphery of the pilot seat body 14, and its sliding portion is O.
Sealed with ring 50.

However, in the conventional pressure control valve, since the pilot seat body 14 and the plug are integrally formed, the pilot seat body 14 and the check poppet 18 and each member incorporated therein obtain concentricity. Since this is the bottom of the deep hole, it is difficult to improve the accuracy of the processing, especially when processing the seat portion 24 formed on the pilot seat body 14. Therefore, in assembling each member having variations in processing accuracy, a slight gap is formed in the fitting portion between the pilot seat body 14 and the check poppet 18 in order to absorb these errors. It was

However, in this case, the sliding portion where the pilot seat body 14 and the check poppet 18 are fitted together requires a sealing means such as an O-ring, so that when the hydraulic pressure becomes a high pressure condition, the O-ring or the like becomes a sliding portion. There is a great risk of oil leaking out of the gap.

On the other hand, in the present invention, due to the configuration described above,
Sleeve the pilot seat body 14 separated from the plug 16.
By having a structure having a degree of freedom so that it can move in the direction orthogonal to the axial direction of 10, the pilot seat body 14 and the check poppet 18 can be slidably fitted with a minimum gap, and therefore, If some oil leakage is allowed, a sealing means such as an O-ring in the sliding portion can be omitted.

In this way, the pilot seat body 14 along with the check poppet 18 that is integrally incorporated with the sleeve 10 are provided.
It is fitted into the sleeve 10 with a degree of freedom in a direction orthogonal to the axial direction of the.

In the check poppet 18, the pilot seat body 14 is slidably inserted into one end opening side thereof, and the piston poppet 32 is incorporated inside the seat portion 34 side of the other end. The relief poppet 31 is slidably inserted.

And, between the flange 51 formed at one end of the piston poppet 32 and the pilot seat body 14, a spring 36 is interposed, and the spring 36 axially moves the relief poppet 31 through the piston poppet 32. By pressing, the tip of the relief poppet 31 is brought into liquid-tight contact with the seat portion 34 formed at the inner end of the check poppet 18.

Further, the spring 36 causes the relief poppet 31 to
The check poppet 18 is pressed in the axial direction of the sleeve 10 via the
The sheet portion 38 formed inside is pressed.

In this way, even if the processing accuracy with respect to the concentricity of each component is insufficient, the pilot seat body 14 has a degree of freedom in a state in which it can move in a direction orthogonal to the axis of the sleeve 10 with respect to the check poppet 18. By the spring
With the pressing force on each seat part 24 and 38 by 28 and 36,
The respective members can be centered on the axis, and the seat portions 24 and 38 can achieve liquid-tight sealing.

In the pressure control valve of the present embodiment configured as described above, when pressure oil is introduced into the inlet 52 of the body 12, the pressure oil flows through the oil passage 54 of the piston poppet 32, and the pressure chamber 56
Flows in.

Here, the area of the seat portion 24 is a, and the pilot seat body 14 is
Check area of the sliding part with check poppet 18 is A,
Assuming that the pressing force of the spring 28 in the state shown in the figure is F, the pressure in the pressure chamber 56 acts on both the pilot seat body 14 and the pilot poppet 26, and they are pressed with the same load F, respectively. The starting pressure of each of 56 is p,
Assuming p ′, the pilot poppet 26 starts its operation according to the following formula F <a × p (1) and the pilot seat body 14 starts according to the following formula F <a × p ′ (2). To do.

Further, as is clear from FIG. 1, since A> a,
From the following equation p × a = p ′ × A (3), the operating pressure p ′ of the pilot seat body 14 becomes the following equation p ′ = p × a / A (4), and the pressure at which the pilot poppet 26 operates than,
At a pressure of a / A, the pilot seat body 14 starts to operate, and at the pressure (Δl) during contact with the plug 16, the pilot poppet 26 does not open and the pressures in the pressure chamber 56 and the inlet 52 are balanced. The poppets 18, 31, 32 retain the state shown in FIG.

Next, after the pilot seat body 14 abuts on the plug 16, when the pressure at the inlet 52 further rises, the pressing force F ′ of the spring 28 at that time is expressed by the following formula F ′ = F + (K × Δl) (5 ) However, K: is indicated by the spring constant of the spring 28, and the pilot poppet 26 is F + (K × Δ
l) Start operation at a pressure of / a. Then each poppet 1
The operating principles of 8, 31, and 32 are well known in the related art, and thus the description thereof is omitted here.

Further, when the pressure at the inlet 52 suddenly rises and the pilot seat body 14 rapidly operates, the volume of the spring chamber rapidly expands, so that the same movement as if the pressure control valve operated momentarily was performed. This movement can reduce the surge pressure which has been a problem in the conventional pilot operated type pressure control valve.

FIG. 2 is a cross-sectional view of essential parts showing another embodiment of the pressure control valve according to the present invention.

That is, in this embodiment, the pilot seat body 14 separated from the plug 16 in the above embodiment is used as the plug
The gap Δl with respect to 16 is eliminated so that the sleeve 10 can move within the range of the gap δ in the radial direction orthogonal to the axis of the sleeve 10.

Therefore, when assembling the pressure control valve of the present embodiment, each component is aligned with the pilot seat body 14 by an appropriate jig and method, and then the plug 16 is screwed to the sleeve 10 to make the pilot seat. The movement of the body 14 in the axial direction is restrained.

Therefore, in the pressure control valve of the present embodiment, the configuration and operation are the same as the pressure control valve of the above embodiment, except that the pilot seat body 14 is restrained the movement in the axial direction. The same components are designated by the same reference numerals, and detailed description thereof will be omitted.

[Effect of device]

As is apparent from the above-described embodiment, according to the pressure control valve of the present invention, the pilot seat body is inserted into the valve body along with the check poppet slidably fitted thereinto the axis of the valve body. By arranging them so that they can move within a predetermined range in a direction orthogonal to each other, even if the processing accuracy of the concentricity of each component is not sufficient, these components can be easily aligned on the same axis. Therefore, the processing can be facilitated, and the airtightness can be sufficiently secured under the high pressure condition of hydraulic pressure.

Further, in the pressure control valve of the present invention, by making the pilot seat body and the plug have a separated structure, it is possible to improve the processing accuracy of each member, and to increase the hydraulic pressure, the hole diameter of the seat portion can be improved. It is possible to reduce the diameter, and since the fitting gap of the sliding portion between the pilot seat body and the check poppet can be minimized, the sealing member required for this sliding portion can be omitted, etc. It has many excellent advantages.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and many improvements and modifications can be made without departing from the spirit of the present invention.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of a pressure control valve according to the present invention, FIG. 2 is a sectional view of a main part showing another embodiment of the pressure control valve according to the present invention, and FIG. FIG. 3 is a cross-sectional view of the main parts showing the configuration of the pressure control valve of FIG. 10 …… Sleeve, 12 …… Body 14 …… Pilot seat body, 16 …… Plug 18 …… Check poppet 20, 20a, 20b …… Spring chamber, 22 …… Flow hole 24,38 …… Seat part 26 …… Pilot poppet, 28, 36 …… Spring 30 …… Projection part, 31 …… Relief poppet 32 …… Piston poppet, 34 …… Seat part 40 …… Adjusting screw, 42 …… Female screw 44 …… Hole, 46 …… Step Port 48, 51 …… Flange, 50 …… O-ring 52 …… Inlet, 54 …… Oil hole 56 …… Pressure chamber

Claims (2)

[Scope of utility model registration request] 1. A pilot seat body (14), which is separated from a plug (16) that is fixedly coupled to one end of a valve body (10), is housed and arranged inside the valve body (10), and the pilot seat body is also provided. A check poppet (1) that is slidably fitted in the outer periphery of (14) in the axial direction of the valve body (10).
8) is incorporated inside the valve body (10), the pilot seat body (14) is slidably inserted into the one end opening side of the check poppet (18), and the seat portion (34) at the other end. A pilot operated type pressure control valve in which a relief poppet (31) having a piston poppet (54) incorporated therein for slidably pressingly contacting and closing with respect to is slidably inserted. The inner wall of the main body (10) is provided with a hole (44) adjacent to the tip of the plug (16) and having a required step with respect to the storage side of the check poppet (18). ) Has a flange (48) fitted and locked in the hole (44), and is elastically pressed and abutted against the other end sheet portion (24) of the pilot seat body (14) to close the flange. Insert the pilot poppet (26) to do the front A direction in which the pilot seat body (14) is orthogonal to at least the axial direction of the valve body, with the flange (48) fitted and locked with a predetermined gap (δ) provided in the hole (44) in the radial direction. A pressure control valve characterized in that it is configured to move within a predetermined range. 2. The flange (48) is provided with a predetermined gap (Δl) in the axial direction of the valve body (10) in the hole (44).
The pressure control valve according to claim 1, wherein the pilot seat body (14) is configured so as to be movable within a predetermined range in the axial direction of the valve body (10).