JP2019105282A - Relief valve structure - Google Patents

Abstract

To provide a relief valve structure which expands a flow passage area in which fluid passes without elongating an axial length of a relief valve, and can improve response performance.SOLUTION: A relief valve structure comprises: a body 10; an abutment face 21 inserted into the body 10 so as to be slidable in an axial direction, and abutting on the body 10; a first pressure-receiving face 22 located inside a radial direction rather than the abutment face 21; and a second pressure-receiving face 23 located outside the radial direction. The body 10 comprises a support part 40 having a valve 20 for switching opening/closing states of a second port 13, and an energization member 30 for energizing the valve 20, and supplying at least one fluid in a flow passage 11 and a first port 12 to the second pressure-receiving face 23 when the valve 20 abuts on the body 10 in a closed state of the second port 13.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a relief valve structure that regulates the fluid pressure of a working fluid.

  Conventionally, as a structure capable of shortening the axial length of a relief valve, Patent Document 1 discloses an end face of a sleeve whose relief pressure is changed by moving inside the body under fluid pressure from the inner circumferential surface to the outer circumferential surface. Techniques are disclosed for forming notches.

  When there is no notch, the pressure receiving area of the fluid pressure is the same as the inner circumferential surface at the position where the sleeve abuts on the body, but increases as the sleeve separates from the body, the surface and the outer circumferential surface are added. Since the sleeve is pushed by the fluid pressure corresponding to the increase in pressure receiving area, it is necessary to extend the axial length of the relief valve in advance by the amount of the pushed movement.

  Therefore, by providing a notch on the end face of the sleeve, the fluid is allowed to flow into the outer peripheral surface even in the sleeve contact state, and the pressure receiving area increase due to the presence or absence of contact and the fluid pressure increase are suppressed. Reduce the momentum. As a result, the amount of extending the length of the relief valve is also reduced in advance, and the axial length of the relief valve can be shortened.

  The same effect can be obtained by applying this technology to the end face of a valve that releases fluid pressure by moving inside the body under fluid pressure.

JP, 2011-220414, A

However, the response performance of the relief valve is degraded when the time for the fluid to flow into the outer peripheral surface when the valve leaves the body is long, and it is thought that the flow path area of the notch through which the fluid passes becomes a bottleneck during that time Be To increase the flow area, it is necessary to increase the width or height of the notch.
There is a limit to increasing the width because the contact surface with the body decreases. When the height is increased, the axial distance between the inner peripheral surface and the outer peripheral surface of the valve is increased, and the axial length of the valve and thus the entire relief valve is extended.

  Therefore, the present invention has been made in view of the above circumstances, and an object thereof is a relief valve capable of enlarging the flow passage area through which fluid passes and improving response performance without extending the axial length of the relief valve. In providing the structure.

  In order to solve the problems described above, a relief valve structure according to an aspect of the present invention includes a body including a first port for introducing a fluid in a flow path and a second port for discharging a fluid; The end face facing the first port, which is slidably inserted in the direction, has an abutment surface that abuts the body, a first pressure receiving surface located radially inward of the abutment surface, and a radial direction from the abutment surface The valve has a second pressure receiving surface located on the outside, and is moved in response to fluid pressure from the first port to switch the open / close state of the second port, and the valve in the direction against the fluid pressure from the first port And, in the closed state of the second port, when the valve abuts on the body, at least one of the fluid in the flow path and the first port is applied to the second pressure receiving surface. The supply unit is provided in the body.

  Thereby, since the flow passage area through which the fluid passes depends on the shape of the supply portion of the body and does not depend on the shape of the end facing the first port of the valve, the axial length of the entire valve and relief valve It can be a relief valve structure which can expand the flow passage area through which the fluid passes and improve the response performance without extending it.

  Preferably, the supply unit may include a groove formed on an abutted surface that abuts on the valve.

  Thereby, when casting a body, since a groove part can also be shape | molded simultaneously, processing time and processing cost can be reduced.

  More preferably, the supply unit may include a first communication passage communicating from at least one of the flow passage and the first port to the groove.

  Thereby, the flow passage area can be increased without increasing the number of grooves. In addition, since the communication passage can be formed by casting as in the case of the groove portion, processing time and processing cost can be reduced.

  In addition, preferably, the supply unit may include a second communication passage that opens radially outward of the contact range of the valve on the abutted surface from at least one of the flow passage and the first port.

  Thus, the fluid can be flowed directly from the flow path or the first port to the second pressure receiving surface, so that the flow path area can be increased without providing the grooves or without increasing the number of the grooves.

  According to the relief valve structure according to the aspect of the present invention, the flow passage area through which the fluid passes can be expanded without increasing the axial length of the relief valve, and the response performance can be improved.

It is sectional drawing of a closed state of the relief valve structure which concerns on one Embodiment of this invention. FIG. 2 is a cross-sectional view of the relief valve structure shown in FIG. 1 in a closed state and in a state without valve abutment. It is sectional drawing of the open state of the relief valve structure shown in FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of the relief valve structure 1 in a closed state. As shown in FIG. 1, the relief valve structure 1 has a cylinder-shaped body 10, a cylindrical valve 20 sliding axially in the body 10, and a biasing member 30 biasing the valve 20. It is incorporated in a pressure circuit (not shown).

  The body 10 is provided with a first port 12 for introducing a fluid in the flow passage 11 and a second port 13 for discharging the fluid. In addition, although the body 10 is shown as an independent structure, you may be integral with the housing member (not shown) which comprises a fluid pressure circuit.

  The valve 20 has, at an end facing the first port 12 and receiving fluid pressure, an abutment surface 21 abutting on the body 10, a first pressure receiving surface 22 radially inward of the abutment surface 21, and a radially outer side The second pressure receiving surface 23 has an annular shape. The valve 20 moves to the first port 12 side to close the second port 13 by the cylindrical sliding portion 24 on the side surface, and moves to the second port 13 side to open the second port 13 Make it

  For example, a compression coil spring is employed as the biasing member 30 to generate a biasing force according to the amount of deflection from the natural length, and the valve 20 is moved to the first port 12 side in a direction to resist the fluid pressure from the first port 12. Energize. Thus, the valve 20 varies its axial position according to the balance between fluid pressure and biasing force.

  The body 10 further includes a supply unit 40 that supplies the fluid in the flow passage 11 and the first port 12 to the second pressure receiving surface 23 when the valve 20 abuts on the body 10 in the closed state.

  The supply unit 40 includes a groove 41 formed on the contact surface 14 in contact with the valve 20, a first communication passage 42 communicating with the flow channel 11 to the groove 41, and a contact surface 14 from the flow channel 11. And a second communication passage 43 which opens radially outward from the contact range of the valve 20 in In addition, the supply part 40 may be equipped with the all, and may selectively be equipped with the one part. Also, the first communication passage 42 and the second communication passage 43 may communicate with each other from the first port 12.

  Next, the operation of the present embodiment will be described.

  As shown in FIG. 1, when the fluid pressure at the first port 12 is less than a predetermined value, the fluid pressure from the first port 12 falls below the biasing force of the biasing member 30, so the valve 20 moves to the first port 12 side. It is pushed and stops in contact with the contact surface 14 of the body 10. At this time, the second port 13 is closed.

  Next, as shown in FIG. 2, when the fluid pressure at the first port 12 rises above a predetermined value and the fluid pressure exceeds the biasing force, the valve 20 is pushed to the second port 13 side and I will not be in touch with you.

  Here, since a gap is created between the contact surface 21 of the valve 20 and the contact surface 14 of the body 10, the pressure receiving area of the fluid pressure of the valve 20 increases, but the fluid from the first port 12 Since it has already been supplied to the second pressure receiving surface 23 through the supply unit 40, the amount of increase is only for the contact surface 21.

  Thus, the amount by which the valve 20 is pushed toward the second port 13 is reduced, the amount by which the length of the relief valve structure 1 is extended is also reduced in advance, and the axial length of the relief valve structure 1 can be shortened.

  As shown in FIG. 3, the amount of deflection of the biasing member 30 increases by the amount by which the valve 20 is pushed toward the second port 13, and the biasing force also increases. If the fluid pressure continues to exceed the biasing force, the valve 20 continues to be pushed until the equilibrium state is reached or the second port 13 is opened.

  Here, the time taken for the second port 13 to switch from the closed state to the open state is exacerbated if the time for the fluid to flow into the second pressure receiving surface 23 when the valve 20 leaves the body 10 is long. The flow passage area of the supply unit 40 can be secured by increasing the number and size of the groove 41, the first communication passage 42, and the second communication passage 43.

  Thereby, the flow passage area through which the fluid passes can be expanded without extending the axial length of the entire valve 20 and the relief valve structure 1, and the response performance can be improved.

After that, when the second port 13 is opened, the fluid pressure of the first port 12 drops and the fluid pressure falls below the biasing force, so the valve 20 is pushed to the first port 12 side, and the second port 13 Is closed. (Figure 1)
In the above embodiment, the relief valve structure 1 may have a discharge hole for discharging the fluid inside to the outside. For example, the body 10 may be disposed opposite to the valve 20, and the holding portion 15 for holding the biasing member 30 may be provided with the discharge hole 16. Alternatively, the body 10 may be provided with a discharge hole (not shown) on the side surface closer to the holding portion 15 than the maximum movement position of the sliding cylindrical portion 24 of the valve 20.

  Thereby, the fluid inside the relief valve structure 1 can freely move in and out, so the resistance at the time of movement of the valve 20 can be reduced, and the response performance of the relief valve structure 1 can be improved.

  In addition, the relief valve structure 1 may have a limiting portion that limits the movement range of the valve 20. For example, the limiting portion 17 may be provided at a position where the distance between the limiting portion 17 and the end face on the limiting portion 17 side of the valve 20 is equal to or less than the allowable deflection amount of the biasing member 30.

  Thus, when the valve 20 moves, the end surface of the valve 20 on the side of the limiting portion 17 abuts on the limiting portion 17 of the body 10 and stops before the biasing member 30 exceeds the allowable deflection amount, ie, before close contact. Therefore, the lowering of the biasing force due to the deterioration or breakage of the biasing member 30 can be suppressed, and the response performance of the relief valve structure 1 can be stabilized.

  In addition, the above-described embodiment can be used for various fluid pressure adjustments, and for example, may be incorporated in a lubricating system hydraulic circuit of an internal combustion engine, and can improve the response performance of the hydraulic pressure adjustment of lubricating oil. Alternatively, it may be incorporated in a circuit of a gas-sealed container, which can improve the response performance of pressure regulation to internal pressure rise due to temperature rise and the like.

  As described above, the embodiments described above are presented as examples and are not intended to limit the scope of the invention. The embodiment described above can be implemented in other various forms, and various omissions, substitutions, and modifications can be made without departing from the scope of the invention. The above-described embodiments and the modifications thereof are included in the scope and the gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

DESCRIPTION OF SYMBOLS 1 relief valve structure 10 body 11 flow path 12 1st port 13 2nd port 14 contact surface 15 holding part 16 discharge hole 17 restriction part 20 valve 21 contact surface 22 first pressure receiving surface 23 second pressure receiving surface 24 cylindrical slide Moving part 30 Biasing member 40 Supply part 41 Groove part 42 first communication passage 43 second communication passage

Claims (4)

A body comprising a first port for introducing a fluid in the flow path and a second port for discharging the fluid;
An axially slidably fitted in the body, an end surface facing the first port, an abutting surface abutting the body, and a first pressure receiving surface positioned radially inward of the abutting surface; A valve that switches the open / close state of the second port by moving in response to a fluid pressure from the first port, and a second pressure receiving surface positioned radially outward of the contact surface;
A biasing member for biasing the valve in a direction that resists fluid pressure from the first port;
In the closed state of the second port, when the valve abuts on the body, a supply portion for supplying at least one fluid in the flow path and the first port to the second pressure receiving surface is provided to the body Equipped with a relief valve structure.   The relief valve structure according to claim 1, wherein the supply portion includes a groove formed in an abutted surface that is in contact with the valve.   The relief valve structure according to claim 2, wherein the supply unit includes a first communication passage communicating with at least one of the flow passage and the first port to the groove portion.   The said supply part is provided with the 2nd communicating path opened to radial direction outer side from the contact range of the said valve | bulb in the said abutted surface from at least one of the said flow path and the said 1st port. Relief valve structure according to any one of the above.

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