Flow Control Valves

Abstract

The present invention provides a flow control valve that can be actuated with a relatively small force. The flow control valve (10) comprises: a valve column receiving block (30) having a valve column receiving hole (31); and a valve column (40) having: a valve column main body (46); a valve column large diameter portion (50) having a diameter larger than the diameter of the valve column main body (46); and a flow path (51) that opens at one end side in the axial direction (da) and is connected to a chamber (C1), the chamber (C1) being located between a portion of the valve column main body (46) that is located closer to the other end side in the axial direction (da) than the valve column large diameter portion (50) and the valve column receiving block (30), the valve column (40) being movably received in the valve column receiving hole (31).

Description

Technical Field

[0001] The present invention relates to a flow control valve for controlling the flow rate of a flowing fluid. Background Art

[0002] Conventionally, flow control valves for controlling the flow rate of fluid flowing in various fluid circuits are used. For example, in hydraulically driven work machines such as construction vehicles, flow control valves for controlling the flow rate of oil flowing in the hydraulic circuits are used in hydraulic circuits for supplying hydraulic oil to hydraulic actuators of the work machines and for supplying pilot pressure for operating hydraulic devices such as reversing valves.

[0003] JP2010-144928A discloses an electro-hydraulic pilot valve having an electromagnetic actuator, a pilot body and a pilot lift valve. In the electro-hydraulic pilot valve, the internal pressure of the first control chamber is connected to the pilot control chamber via a control path provided in the pilot lift valve. At this time, the top end of the pilot body closes the pilot passage provided in the pilot piston and blocks the flow of liquid between the pilot control chamber and the outlet. The closed pressure presses the pilot lift valve against the pilot lift valve seat. Thus, the flow between the inlet and outlet of the electro-hydraulic pilot valve is blocked. If the electromagnetic actuator is energized, the pilot body moves upward and the pilot passage opens, and the pressure in the pilot control chamber is released to the release path. If the opening between the pilot control chamber and the pilot passage reaches a predetermined size, the pilot lift valve moves following the pilot body. Its movement causes the top end of the pilot body to return to the pilot passage side and reduces the flow passing through the pilot passage. When the flow in the pilot passage reaches a balanced state, the pilot poppet valve stops its movement and maintains the open position.

[0004] According to such an electro-hydraulic pilot valve, there is an advantage that the current applied to the electromagnetic actuator can be selectively controlled to proportionally control the flow of the liquid passing through the electro-hydraulic pilot valve.

[0005] However, in the control valve disclosed in JP2010-144928A, the pilot body is subjected to the pressure in the pilot control chamber, that is, the internal pressure of the first control chamber connected via the control path, at its top end. The internal pressure of the first control chamber is relatively high, so a large force is required to move the pilot body to overcome the internal pressure of the first control chamber. Therefore, as an electromagnetic actuator for generating a driving force to drive the pilot body, an electromagnetic actuator capable of generating a large driving force is required. In this case, there are the following problems: the overall size of the electro-hydraulic pilot valve is increased, and the cost is also increased. Summary of the invention

[0006] The present invention has been made in consideration of such a point, and an object of the present invention is to provide a flow control valve that can be actuated with a relatively small force.

[0007] The flow control valve of the present invention has:

[0008] A valve post receiving block having a valve post receiving hole; and

[0009] A valve column, comprising: a valve column main body; a valve column large diameter portion, which has a diameter larger than the diameter of the valve column main body; and a flow path, which opens at one end side in the axial direction and is connected to a chamber, the chamber being located between a portion of the valve column main body that is closer to the other end side in the axial direction than the valve column large diameter portion and the valve column receiving block, the valve column being movably received in the valve column receiving hole.

[0010] In the flow control valve of the present invention, it is also possible that:

[0011] The valve stem body has an end surface located at the one end.

[0012] The valve stem large diameter portion has an action surface facing the other end side,

[0013] The area of ​​the one end surface is the same as the area of ​​the active surface.

[0014] In the flow control valve of the present invention, it is also possible that:

[0015] The large-diameter portion of the valve stem is located in a middle portion of the valve stem away from the one end and the other end.

[0016] In the flow control valve of the present invention, it is also possible that:

[0017] The valve stem large diameter portion has another action surface facing the one end side,

[0018] The valve column has another flow path, which opens at the other end side of the valve column and is connected to another chamber, and the other chamber is located between the portion of the valve column body that is closer to the one end side than the valve column large diameter portion and the valve column receiving block.

[0019] In the flow control valve of the present invention, it is also possible that:

[0020] The valve rod moves in the valve rod accommodation hole by the driving force of the solenoid.

[0021] The flow control valve of the present invention has:

[0022] A valve post receiving block having a valve post receiving hole;

[0023] and a valve column, which comprises: a valve column main body, which has an end face located at one end in the axial direction; a valve column large diameter portion, which has a diameter larger than the diameter of the valve column main body, and is located in the middle portion away from the one end and the other end in the axial direction, and has an action surface facing the other end side and another action surface facing the one end side, the area of ​​the one end face is the same as the area of ​​the action surface; a flow path, which opens at the one end side and is connected to a chamber, which is located between a portion of the valve column main body that is closer to the other end side than the valve column large diameter portion and the valve column receiving block; and another flow path, which opens at the other end side and is connected to another chamber, which is located between a portion of the valve column main body that is closer to the one end side than the valve column large diameter portion and the valve column receiving block, and the valve column can move in the valve column receiving hole by using the driving force of the solenoid.

[0024] The flow control valve of the present invention has:

[0025] A valve stem having: a valve stem main body configured to be movable to one side and the other side along an axial direction; and a valve stem large diameter portion having a diameter larger than that of the valve stem main body;

[0026] a pressure chamber, at least a portion of which is formed by dividing the end of the one side of the valve stem body, and generating a pressing force for pressing the valve stem body from the one side toward the other side;

[0027] A chamber, at least a part of which is formed by dividing the portion of the valve column main body that is closer to the other end side than the valve column large diameter portion, generates another pressing force, which presses the valve column large diameter portion from the other side toward the one side, eliminating at least a part of the pressing force brought by the pressure chamber; and

[0028] The pressure chamber connecting flow path can control the flow rate of oil from the pressure chamber to the control flow path whose flow rate should be controlled when the spool body moves from the other side to the one side due to the driving force of the solenoid.

[0029] Effects of the Invention

[0030] According to the present invention, it is possible to provide a flow control valve that can be actuated with a relatively small force. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a diagram for explaining one embodiment of the present invention and is a cross-sectional view showing a flow control valve in a state of being attached to an attached member.

[0032] Figure 2 It is magnified Figure 1FIG. 1 is a diagram of a portion marked with II, and shows a flow control valve in a closed state.

[0033] Figure 3 is with Figure 2 The corresponding figure shows the flow control valve in the flow state.

[0034] Figure 4 It is a longitudinal sectional view showing a valve stem of a flow control valve.

[0035] Figure 5 It indicates the valve stem and Figure 4 A longitudinal sectional view of a section orthogonal to the section shown.

[0036] Figure 6 is with Figure 4 The cross-sectional view corresponding to the VI-VI line.

[0037] Figure 7 is with Figure 4 The cross-sectional view corresponding to the line VII-VII.

[0038] Description of Reference Numerals

[0039] 10. Flow control valve; 12. Valve column pressing spring; 14. Lift valve pressing spring; 16. Clearance; 20. Housing; 21. Receiving hole; 22. Pressure source port; 23. Control port; 25. Seat; 30. Valve column receiving block; 30a. First block; 30b. Second block; 31. Valve column receiving hole; 40. Valve column; 41. One end surface; 44. The other end surface; 46. Valve column main body; 47. Peripheral groove (pressure chamber connecting flow path); 48. Notch (pressure chamber connecting flow path); 50. Valve column large diameter portion; 50a. First action surface (action surface); 50b. Second action surface (the other action surface) Surface); 51, the first connecting flow path (flow path); 55, the second connecting flow path (another flow path); 60, the lifting valve; 61, the main body; 63, the mounting surface; 68, the throttling part; 69, the notch part; 70, the ball; 71, the supporting member; 80, the driving device; 82, the driving rod; 84, the driving part; 90, the mounted member; 91, the main body; 92, the flow control valve mounting hole; 95, the pressure source flow path; 96, the control flow path; 97, the discharge flow path; A, the central axis; C1, the first chamber (chamber); C2, the second chamber (another chamber); C3, the third chamber; Cp, the pressure chamber; Cr, the rod chamber. DETAILED DESCRIPTION

[0040] Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings. In the drawings attached to this specification, for the convenience of illustration and easy understanding, the scale and the aspect ratio are appropriately changed and exaggerated from the actual objects.

[0041] In addition, the shapes, geometric conditions and the degrees of determination thereof, such as terms such as "parallel", "orthogonal", "same", lengths, angle values, etc. used in this specification are not restricted to strict meanings but shall be interpreted within the scope of the degree to which the same function can be expected.

[0042] Figure 1 to Figure 7 It is a figure for demonstrating one embodiment of this invention. Figure 1 is a cross-sectional view showing the flow control valve 10 in a state of being installed to the installed member 90. Figure 2 and Figure 3 It is magnified Figure 1 Figure 2 shows the portion labeled II. Figure 2 In the figure, the flow control valve 10 is shown in a closed state, Figure 3 , the flow control valve 10 is shown in a flow-through state.

[0043] The mounted component 90 is a component for mounting the flow control valve 10. A flow control valve mounting hole 92 for mounting the flow control valve 10 is provided in the main body 91 of the mounted component 90. The flow control valve mounting hole 92 extends along the axial direction da, and has a substantially circular shape in a cross section orthogonal to the axial direction da. The flow control valve mounting hole 92 has a first inner circumferential groove 93 and a second inner circumferential groove 94 in sequence from the top end side (one side) of the flow control valve mounting hole 92. The first inner circumferential groove 93 and the second inner circumferential groove 94 are respectively formed in an annular shape along the circumferential direction of the flow control valve mounting hole 92. Figure 1 In the example shown, the main body 91 is provided with a pressure source flow path 95 communicating with the top end of the flow control valve mounting hole 92, a control flow path 96 communicating with the first inner peripheral groove 93, and a drain flow path 97 communicating with the second inner peripheral groove 94. The pressure source flow path 95 is communicated with a pressure source not shown, and the control flow path 96 is communicated with a hydraulic device not shown. When the flow control valve 10 is mounted in the flow control valve mounting hole 92, the flow rate of the fluid, especially the oil, flowing from the pressure source flow path 95 to the control flow path 96 is controlled by the flow control valve 10. The drain flow path 97 is communicated with a tank not shown, and the oil flowing into the drain flow path 97 is discharged to the tank.

[0044] The flow control valve 10 includes: a valve spool receiving block 30 having a valve spool receiving hole 31; and a valve spool 40 movably received in the valve spool receiving block 30. The flow control valve 10 of this embodiment further includes: a housing 20 having a receiving hole 21; a poppet valve 60 received in the housing 20; and a valve spool pressing spring 12 and a poppet valve pressing spring 14.

[0045] In this specification, the “axial direction (da)” refers to the direction in which the central axis A of the valve stem 40 extends (the length direction of the valve stem 40). Figure 1 to Figure 5 In the figure, the lower side) is set as "one side", and the base end side of the flow control valve 10 along the axial direction da (the side connected to the drive device 80, in Figure 1 to Figure 5 in the figure, the upper side) is set to "the other side".

[0046] The housing 20 has a housing hole 21 that houses at least a portion of the valve stem housing block 30, the valve stem 40, the poppet valve 60, the valve stem pressing spring 12, and the poppet valve pressing spring 14. The housing 20 has a pressure source port 22 that communicates with the pressure source flow path 95 and a control port 23 that communicates with the control flow path 96 when the flow control valve 10 is mounted in the flow control valve mounting hole 92. The pressure source port 22 extends from the top end (one end) of the housing hole 21 along the axial direction da. The control flow path 96 extends from the side of the housing hole 21 in a radial direction orthogonal to the axial direction da. In the example shown in the figure, the housing 20 has a plurality of control ports 23 arranged along the circumferential direction around the central axis A of the valve stem 40. The housing hole 21 has an inner peripheral groove 24 that communicates with the control port 23. The inner peripheral groove 24 is formed in an annular shape along the circumferential direction of the housing hole 21. A seat 25 on which the mounting surface 63 of the lift valve 60 is mounted is provided at the opening of the pressure source port 22 on the side (the other side) of the receiving hole 21. In the example shown in the figure, the seat 25 is located at the connection portion between the pressure source port 22 and the inner peripheral groove 24. The seat 25 is composed of a surface extending in a direction inclined relative to both the axial direction and the radial direction, and is formed in an annular shape along the circumference of the receiving hole 21. The housing 20 has a first through hole 26 and a second through hole 27 that connect the receiving hole 21 and the outer surface of the housing 20. The first through hole 26 connects the receiving hole 21 and the inner peripheral groove 24 via a gap 16 formed between the inner surface of the flow control valve mounting hole 92 and the outer surface of the housing 20. The second through hole 27 is located on the other side relative to the first through hole 26, so that the receiving hole 21 and the second inner peripheral groove 94 are connected.

[0047] The valve post receiving block 30 has a valve post receiving hole 31 extending in the axial direction to receive the valve post 40. The valve post receiving hole 31 penetrates the valve post receiving block 30 along the axial direction da. A spring support surface 32 is formed at the top end of one side of the valve post receiving block 30. The spring support surface 32 supports the lift valve pressing spring 14 and bears the pressing force from the lift valve pressing spring 14. In the illustrated example, the valve post receiving block 30 is composed of a first block 30a and a second block 30b located on the other side of the first block 30a. The valve post receiving hole 31 is provided across the first block 30a and the second block 30b. In the illustrated example, the valve post receiving hole 31 is composed of a first small diameter hole 31a and a large diameter hole 31b provided in the first block 30a, and a second small diameter hole 31c provided in the second block 30b. The first small diameter hole 31a, the large diameter hole 31b, and the second small diameter hole 31c extend in the axial direction, and the central axes of the first small diameter hole 31a, the large diameter hole 31b, and the second small diameter hole 31c coincide with each other. In addition, the central axes of the first small diameter hole 31a, the large diameter hole 31b, and the second small diameter hole 31c coincide with the central axis A of the valve column 40. The first small diameter hole 31a, the large diameter hole 31b, and the second small diameter hole 31c each have a circular shape in a cross section orthogonal to the central axis. The first small diameter hole 31a is located on one side of the large diameter hole 31b and has a smaller diameter than the diameter of the large diameter hole 31b. The second small diameter hole 31c is located on the other side of the large diameter hole 31b and has a smaller diameter than the diameter of the large diameter hole 31b. The size relationship between the diameter of the first small diameter hole 31a and the diameter of the second small diameter hole 31c is not particularly limited. In the example shown in the figure, the diameter of the first small diameter hole 31a is equal to the diameter of the second small diameter hole 31c. The diameters of the first small diameter hole 31a and the second small diameter hole 31c correspond to the diameter of the valve stem body 46 of the valve stem 40, and the diameter of the large diameter hole 31b corresponds to the diameter of the valve stem large diameter portion 50 of the valve stem 40.

[0048] The first inner circumferential groove 33 is provided in the first small diameter hole 31a. In addition, the second inner circumferential groove 35 is provided between the first small diameter hole 31a and the large diameter hole 31b. The first inner circumferential groove 33 and the second inner circumferential groove 35 are respectively formed in an annular shape along the circumferential direction of the valve stem receiving hole 31. The first outer circumferential groove 36 communicating with the first through hole 26 of the housing 20 and the second outer circumferential groove 37 communicating with the second through hole 27 of the housing 20 are provided on the outer side surface of the valve stem receiving hole 31. The valve stem receiving block 30 (the first block 30a) has: a first through hole 38 extending in the radial direction so that the first inner circumferential groove 33 is communicated with the first outer circumferential groove 36; and a second through hole 39 extending in the radial direction so that the second inner circumferential groove 35 is communicated with the second outer circumferential groove 37. In the example shown in the figure, the spool accommodation block 30 (first block 30a) has a plurality of first through holes 38 and a plurality of second through holes 39 arranged in the circumferential direction.

[0049] When the flow control valve 10 is mounted in the flow control valve mounting hole 92 of the mounted member 90, the housing 20 is fixed to the flow control valve mounting hole 92 by threaded connection or the like, and the valve stem receiving block 30 is fixed to the housing 20 by threaded connection or the like. Therefore, when the flow control valve 10 is mounted in the flow control valve mounting hole 92 of the mounted member 90, the housing 20 and the valve stem receiving block 30 do not move relative to the mounted member 90.

[0050] Figure 4 4 is a longitudinal sectional view showing the valve stem 40. Figure 5 It indicates the valve stem 40 and Figure 4 A longitudinal sectional view of a section orthogonal to the section shown. The valve column 40 has a central axis A extending in the longitudinal direction and is accommodated in the valve column accommodation hole 31 of the valve column accommodation block 30 in a manner that it can move along the axial direction da. The central axis A of the valve column 40 extends along the axial direction da. The valve column 40 has an end face 41 located at one end (one side end) along the axial direction da and another end face 44 located at the other end (the other side end). That is, the one end face 41 is a face of the valve column 40 facing one side, and the other end face 44 is a face of the valve column 40 facing the other side. The one end face 41 includes a protruding face 42 protruding toward one side and a spring supporting face 43 located around the protruding face 42. The spring supporting face 43 supports the valve column pressing spring 12 and bears the pressing force from the valve column pressing spring 12. The other end face 44 has a notch portion 45 that communicates with the second connecting flow path 55 discussed later. The notch portion 45 is provided so that when a driving rod 82 of a driving device 80 to be described later comes into contact with the other end surface 44 , the driving rod 82 does not close the opening of the second connecting flow path 55 .

[0051] The valve column 40 has: a valve column body portion 46; and a valve column large diameter portion 50 having a diameter larger than the diameter of the valve column body portion 46. In the example shown in the figure, the valve column large diameter portion 50 is located in the middle portion away from one end and the other end of the valve column 40. The valve column body portion 46 has an outer peripheral groove 47 located on one side of the valve column large diameter portion 50. The outer peripheral groove 47 is formed in an annular shape along the circumferential direction of the valve column body portion 46. A notch portion 48 is formed at the end of one end side of the outer peripheral groove 47, in which the valve column body portion 46 is partially removed along the axial direction da. In this specification, the end of one side of the valve column 40 is referred to as "one end", and the end of the other side is referred to as "the other end". At the same time, in the valve column 40, one side is sometimes referred to as "one end side" and the other side is sometimes referred to as "the other end side".

[0052] The valve stem large diameter portion 50 has a first action surface (action surface) 50a facing the other end side and a second action surface (other action surface) 50b facing the one end side. The first action surface 50a connects the other end side edge of the outer surface of the valve stem large diameter portion 50 extending along the axial direction da and the outer surface of the valve stem main body 46 at the other end side of the valve stem large diameter portion 50. The second action surface 50b connects the one end side edge of the outer surface of the valve stem large diameter portion 50 extending along the axial direction da and the outer surface of the valve stem main body 46 at the one end side of the valve stem large diameter portion 50. In the example shown in the figure, the area of ​​the one end surface 41 of the valve stem 40 is the same as the area of ​​the first action surface 50a. In addition, the area of ​​the other end surface 44 of the valve stem 40 is the same as the area of ​​the second action surface 50b. In addition, the areas of the one end face 41, the other end face 44, the first action face 50a and the second action face 50b are respectively set to the areas on the plane when each face 41, 44, 50a, 50b is projected along the axial direction da onto the plane orthogonal to the center axis A (axial direction da).

[0053] The valve stem large diameter portion 50 is disposed in the large diameter hole 31b of the valve stem receiving hole 31. The diameters of the first small diameter hole 31a and the second small diameter hole 31c of the valve stem receiving hole 31 are smaller than the diameter of the valve stem large diameter portion 50. Therefore, the valve stem large diameter portion 50 can move along the axial direction da in the entire range within the large diameter hole 31b and the second inner peripheral groove 35. More specifically, the valve stem 40 can move along the axial direction da from the position where the first action surface 50a of the valve stem large diameter portion 50 contacts the other end of the large diameter hole 31b to the position where the second action surface 50b of the valve stem large diameter portion 50 contacts one end of the second inner peripheral groove 35.

[0054] exist Figure 1 to Figure 3In the example shown, three spaces (first chamber C1, second chamber C2, and third chamber C3) are formed between the valve stem 40 and the valve stem receiving block 30. The first chamber (chamber) C1 is located between the portion of the valve stem main body 46 located on the other end side than the valve stem large diameter portion 50 and the valve stem receiving block 30. In the example shown in the figure, the first action surface 50a of the valve stem large diameter portion 50 faces the first chamber C1. In this case, the first chamber C1 is defined by the portion of the valve stem main body 46 located on the other end side than the valve stem large diameter portion 50, the first action surface 50a, and the valve stem receiving hole 31 of the valve stem receiving block 30. The second chamber (another chamber) C2 is located between the portion of the valve stem main body 46 located on the one end side than the valve stem large diameter portion 50 and the valve stem receiving block 30. In the example shown in the figure, the second action surface 50b of the valve stem large diameter portion 50 faces the second chamber C2. In this case, the second chamber C2 is defined by the portion of the valve stem body 46 located on the other end side than the valve stem large diameter portion 50, the second action surface 50b, and the valve stem receiving hole 31 of the valve stem receiving block 30. In particular, in the example shown in the figure, the portion of the valve stem receiving hole 31 defining the second chamber C2 includes the second inner peripheral groove 35. The third chamber C3 is located between the portion of the valve stem body 46 located on the one end side than the valve stem large diameter portion 50 and the valve stem receiving block 30 on one side (one end side) of the second chamber C2. In particular, in the example shown in the figure, the portion of the valve stem body 46 defining the third chamber C3 includes the outer peripheral groove 47, and the portion of the valve stem receiving hole 31 defining the third chamber C3 includes the first inner peripheral groove 33.

[0055] The valve stem 40 has a first connecting flow path (flow path) 51, which opens at one end side in the axial direction da and communicates with the first chamber C1. In the example shown in the figure, the first connecting flow path 51 opens at one end face 41 at one end side of the valve stem 40. In particular, the first connecting flow path 51 opens at the protruding surface 42 of the one end face 41. The first connecting flow path 51 includes a first connecting hole 52 located inside the valve stem 40 and a first connecting groove 53 formed on the outer surface of the valve stem large diameter portion 50. The first connecting hole 52 includes: an axial direction portion 52a, which opens at one end side of the valve stem 40 and extends along the central axis A; and a radial portion 52b, which communicates with the other end side end of the axial direction portion 52a and extends in the radial direction of the valve stem 40. The first connecting groove 53 communicates with the radial outer portion of the radial portion 52b of the first connecting hole 52 and extends along the axial direction da. In the example shown in the figure, the radial portion 52b of the first connection hole 52 passes through the other end side end of the axial direction portion 52a and penetrates the valve column large diameter portion 50. In other words, the radial portion 52b extends from the other end side end of the axial direction portion 52a in opposite directions at an angle of 180 degrees to each other. In addition, the first connection grooves 53 are connected to both ends of the radial portion 52b. That is, the valve column 40 has two first connection grooves 53 located on opposite sides relative to the central axis A. In addition, the valve column 40 is not limited to this, and it can have one first connection groove 53 or more than three first connection grooves 53.

[0056] The valve stem 40 has a second connecting flow path (another flow path) 55, which opens at the other end side in the axial direction da and communicates with the second chamber C2. In the example shown in the figure, the second connecting flow path 55 opens at the other end surface 44 at the other end side of the valve stem 40. The second connecting flow path 55 includes a second connecting hole 56 located inside the valve stem 40 and a second connecting groove 57 formed on the outer surface of the valve stem large diameter portion 50. The second connecting hole 56 includes: an axial direction portion 56a, which opens at the other end side of the valve stem 40 and extends along the central axis A; and a radial portion 56b, which communicates with one end side end of the axial direction portion 56a and extends in the radial direction of the valve stem 40. The second connecting groove 57 communicates with the radial outer portion of the radial portion 56b of the second connecting hole 56 and extends along the axial direction da. In the example shown in the figure, the radial portion 56b of the second connection hole 56 passes through the end portion of the axial direction portion 56a and penetrates the valve stem large diameter portion 50. In other words, the radial portion 56b extends from the end portion of the axial direction portion 56a in opposite directions at an angle of 180 degrees to each other. In addition, the second connection grooves 57 are connected to both ends of the radial portion 56b. That is, the valve stem 40 has two second connection grooves 57 located on opposite sides relative to the central axis A. In addition, the valve stem 40 is not limited to this, and the valve stem 40 may have one second connection groove 57 or three or more second connection grooves 57.

[0057] Figure 6 is with Figure 4 The cross-sectional view corresponding to the VI-VI line, Figure 7 is with Figure 4 VII-VII line of the sectional view. In the example shown in the figure, when viewed along the axial direction da, the radial portion 52b of the first connecting hole 52 and the radial portion 56b of the second connecting hole 56 extend orthogonally to each other. As a result, the first connecting groove 53 and the second connecting groove 57 have an angle of 90 degrees in the circumferential direction of the valve stem 40 and are separated from each other. Therefore, the first connecting flow path 51 and the second connecting flow path 55 form independent flow paths.

[0058] The poppet valve 60 is configured to be movable in the receiving hole 21 of the housing 20 along the axial direction da. The poppet valve 60 includes: a main body 61 that closes and opens the pressure source port 22 of the housing 20; and a ball 70 and a support member 71 that are accommodated in the main body 61. The main body 61 includes a small diameter portion 61a located in the pressure source port 22 in the closed state and a large diameter portion 61b located on the other side of the small diameter portion 61a. The main body 61 includes a top end surface 62 located at one end of the small diameter portion 61a. A seating surface 63 that is seated on the seat portion 25 of the housing 20 in the closed state is formed on the portion of the outer side surface of the main body 61 located between the small diameter portion 61a and the large diameter portion 61b. The seating surface 63 is formed by a surface extending in a direction inclined relative to both the axial direction and the radial direction, and is formed in an annular shape along the circumferential direction of the poppet valve 60.

[0059] A spring receiving hole 64 is provided in the large diameter portion 61b, and the spring receiving hole 64 opens on the other side of the poppet valve 60, and receives at least a portion of the valve stem pressing spring 12 and at least a portion of the poppet valve pressing spring 14. A spring supporting surface 64a is formed at an end portion of one side of the spring receiving hole 64. The spring supporting surface 64a supports the poppet valve pressing spring 14 and receives the pressing force from the poppet valve pressing spring 14.

[0060] The main body 61 further includes a support member receiving hole 65, a ball receiving hole 66, a connecting hole 67, and a throttle portion 68. The support member receiving hole 65 opens at the spring receiving hole 64 on the other side and receives the support member 71. The ball receiving hole 66 opens at the support member receiving hole 65 on the other side and receives the ball 70. The connecting hole 67 opens at the support member receiving hole 65 on the other side and communicates with the throttle portion 68 on one side. The throttle portion 68 opens at the connecting hole 67 on the other side and opens at the top end surface 62 on one side. A notch portion 69 is formed radially outward of the top end surface 62.

[0061] The support member 71 includes: a protruding surface 72, which protrudes toward the other side from the surface facing the other side; and a spring support surface 73, which is located around the protruding surface 72. The spring support surface 73 supports the valve post pressing spring 12 and bears the pressing force from the valve post pressing spring 12. The support member 71 also has a through hole 74 extending along the central axis A and a notch portion 75 communicating with the through hole 74. The through hole 74 extends along the central axis A and opens at the protruding surface 72 on the other side of the support member 71. The notch portion 75 is composed of a groove-shaped notch, which is provided on one side of the support member 71 and extends in the radial direction of the support member 71. The notch portion 75 is communicated with the through hole 74 on the inner side in the radial direction and is communicated with the outer side surface of the support member 71 on the outer side in the radial direction. In addition, the notch portion 75 may not be communicated with the outer side surface of the support member 71 on the outer side in the radial direction. The specific shape of the notch 75 is not particularly limited as long as the through hole 74 is not completely closed by the ball 70 even when the ball 70 contacts the through hole 74 of the support member 71 and the ball receiving hole 66 and the through hole 74 are connected via the notch 75 .

[0062] The throttle portion 68 functions as a throttle hole that limits the flow rate per unit time of the oil flowing from the pressure source port 22 of the housing 20 toward the connecting hole 67 . Therefore, the cross-sectional area of ​​the throttle portion 68 is much smaller than that of the connecting hole 67 .

[0063] The ball 70 is accommodated in the ball accommodation hole 66 and can move in the ball accommodation hole 66. The diameter of the ball 70 is smaller than the diameter of the ball accommodation hole 66 and larger than the diameter of the connecting hole 67. Therefore, the entire ball 70 does not enter the connecting hole 67. Thus, the ball 70 cooperates with the connecting hole 67 to function as a check valve. Specifically, the ball 70 allows oil to flow from the connecting hole 67 toward the ball accommodation hole 66. On the other hand, when the oil is about to flow from the ball accommodation hole 66 toward the connecting hole 67, the ball 70 closes the opening on the other side of the connecting hole 67. Therefore, the oil is not allowed to flow from the ball accommodation hole 66 toward the connecting hole 67.

[0064] A spool pressing spring 12 is disposed between the spool 40 and the poppet 60. In the illustrated example, the spool pressing spring 12 is disposed in a compressed state between a spring support surface 43 of the spool 40 and a spring support surface 73 of a support member 71 of the poppet 60. Therefore, the pressing force from the spool pressing spring 12 acts on the spring support surfaces 43 and 73, respectively.

[0065] A poppet valve pressing spring 14 is disposed between the spool housing block 30 and the poppet valve 60. In the illustrated example, the poppet valve pressing spring 14 is disposed in a compressed state between the spring support surface 32 of the spool housing block 30 and the spring support surface 64a of the poppet valve 60. Therefore, the pressing force from the poppet valve pressing spring 14 acts on the spring support surfaces 32 and 64a, respectively.

[0066] A pressure chamber Cp is formed between the spool housing block 30 and the poppet valve 60. Oil flows from the pressure source flow path 95 of the mounted member 90 into the pressure chamber Cp via the pressure source port 22 of the housing 20, the throttle portion 68 of the poppet valve 60, the connecting hole 67, the ball housing hole 66, the support member housing hole, and the spring housing hole 64.

[0067] Sealing members 18 such as O-rings are arranged between the flow control valve mounting hole 92 of the mounted member 90 and the outer surface of the housing 20 and between the housing hole 21 of the housing 20 and the outer surface of the spool housing block 30 to prevent oil leakage.

[0068] The movement of the valve column 40 along the axial direction da is controlled by the driving device 80. The driving device 80 has a driving rod 82 and a driving part 84. In the example shown in the figure, the driving part 84 drives the driving rod 82 toward one side along the axial direction da using the driving force generated by the solenoid. The driving rod 82 abuts against the other end surface 44 of the valve column 40 to move the valve column 40 along the axial direction da. That is, in the example shown in the figure, the valve column 40 moves along the axial direction da in the valve column receiving hole 31 using the driving force of the solenoid. In addition, it is not limited to this, and the driving part 84 can also be configured to drive the driving rod 82 using other driving forces such as pilot pressure. In addition, a rod chamber Cr surrounded by the driving device 80 and the flow control valve 10 is formed at the joint portion where the driving device 80 and the flow control valve 10 are combined. In the example shown in the figure, the rod chamber Cr is divided and formed by the driving device 80 and the valve column receiving block 30 (the second block 30b). A driving rod 82 of the driving device 80 and the other end portion (the other end surface 44 ) of the spool 40 are arranged in the rod chamber Cr.

[0069] Next, refer to Figure 2 and Figure 3 Next, the operation of the flow control valve 10 according to the present embodiment will be described.

[0070] like Figure 2 As shown in the figure, when the driving rod 82 of the driving device 80 is retreated to the maximum extent, that is, when the driving rod 82 is located at the position closest to the other side, the valve column 40 is located at the position closest to the other side (retracted position) under the action of the pressing force of the valve column pressing spring 12. In detail, the pressing force of the valve column pressing spring 12 acts on the spring support surface 43 of the valve column 40, thereby the valve column 40 is located at the retracted position. At this time, the other end surface 44 of the valve column 40 contacts the driving rod 82 of the driving device 80.

[0071] At this time, the second chamber C2 formed between the spool 40 and the spool receiving block 30 communicates with the discharge flow path 97 via the second through hole 39 of the spool receiving block 30, the second outer peripheral groove 37, the second through hole 27 of the housing 20, and the second inner peripheral groove 94 of the mounted member 90. In addition, the third chamber C3 communicates with the control flow path 96 via the first through hole 38 of the spool receiving block 30, the first outer peripheral groove 36, the first through hole 26 of the housing 20, the gap 16 formed between the inner surface of the flow control valve mounting hole 92 and the outer surface of the housing 20, and the first inner peripheral groove 93 of the mounted member 90. The spool 40 closes the pressure chamber Cp and the third chamber C3.

[0072] Oil flows from the pressure source flow path 95 of the mounted member 90 into the pressure chamber Cp via the pressure source port 22 of the housing 20, the throttle portion 68 of the poppet valve 60, the connection hole 67, the ball receiving hole 66, the support member receiving hole, and the spring receiving hole 64. The throttle portion 68 limits the flow rate per unit time of the oil flowing from the pressure source port 22 toward the connection hole 67. Therefore, if a high hydraulic pressure acts on the pressure source flow path 95, after a certain time, the same hydraulic pressure as that of the pressure source flow path 95 also acts on the pressure chamber Cp.

[0073] The pressing force that presses the lift valve 60 toward one side under the action of the pressure in the pressure chamber Cp acts on the surface (the other side) of the large diameter portion 61b of the lift valve 60 that faces the other side. In addition, the pressing force that presses the lift valve 60 toward the other side under the action of the pressure in the pressure source flow path 95 acts on the surface (one side) of the small diameter portion 61a that faces one side. The area of ​​the other side of the large diameter portion 61b is equal to the area on the plane when the large diameter portion 61b is projected along the axial direction da onto the plane orthogonal to the center axis A (axial direction da). In addition, the area of ​​one side of the small diameter portion 61a is equal to the area on the plane when the small diameter portion 61a is projected along the axial direction da onto the plane orthogonal to the center axis A (axial direction da). In the example shown in the figure, the area of ​​the other side of the large diameter portion 61b is larger than the area of ​​one side of the small diameter portion 61a. Therefore, the pressing force acting on the other side of the large diameter portion 61b and pressing the lift valve 60 toward one side is greater than the pressing force acting on one side of the small diameter portion 61a and pressing the lift valve 60 toward the other side. In addition, the lift valve 60 receives the pressing force pressing the lift valve 60 toward one side from the lift valve pressing spring 14 with the aid of the spring supporting surface 73 of the supporting member 71. Thus, the lift valve 60 is pressed against the seat 25 of the housing 20 by the difference between the pressing force pressing the lift valve 60 toward one side by the pressure in the pressure chamber Cp and the pressing force pressing the lift valve 60 toward the other side by the pressure in the pressure source flow path 95, and the pressing force received from the lift valve pressing spring 14. In more detail, the seating surface 63 of the lift valve 60 is pressed against the seat 25 of the housing 20. At this time, as Figure 2 As shown, the poppet valve 60 is located at the most side position (closed position), and the flow control valve 10 is in a closed state in which the flow path communicating from the pressure source flow path 95 to the control flow path 96 is closed.

[0074] Next, the operation for transitioning the flow control valve 10 from the closed state to the flow state is described. When the driving portion 84 of the driving device 80 is driven to move the driving rod 82 toward one side along the axial direction da, the valve column 40 is pressed by the driving rod 82 and also moves toward one side (advanced position) along the axial direction da. In this embodiment, the driving portion 84 includes an electromagnetic actuator, and the driving rod 82 is moved toward one side by the driving force generated by the electromagnetic actuator.

[0075] Under the action of the pressure acting in the pressure chamber Cp, a pressing force toward the other side is generated on the valve stem 40 via the one end face 41. The valve stem 40 has a first connecting flow path (flow path) 51, which opens at the one end face 41 and communicates with the first chamber (chamber) C1. In addition, the first action surface (action surface) 50a of the valve stem large diameter portion 50 of the valve stem 40 faces the first chamber C1. As a result, the same pressure as the pressure acting on the one end face 41 of the valve stem 40 acts on the first action surface 50a. That is, under the action of the pressure acting on the first chamber C1, a pressing force toward one side is generated on the valve stem 40 via the first action surface 50a. Therefore, the pressing force toward one side generated on the valve stem 40 via the first action surface 50a cancels at least a part of the pressing force toward the other side via the one end face 41 (cancels each other). This can effectively reduce the pressure in the pressure chamber Cp that presses the spool 40 toward the other side, thereby reducing the driving force required for the drive device 80. Therefore, the drive device 80 can be miniaturized and the cost of the drive device 80 can be reduced.

[0076] In particular, in the flow control valve 10 of the present embodiment, the area of ​​the one end face 41 and the area of ​​the first action surface 50a are the same. In this case, the pressing force toward the other side by means of the one end face 41 and the pressing force toward one side by means of the first action surface 50a cancel each other out. Therefore, only the pressing force of the valve post pressing spring 12 becomes the pressing force that presses the valve post 40 toward the other side. That is, the drive device 80 can move the valve post 40 toward the forward position by only pressing the valve post 40 by overcoming the pressing force of the valve post pressing spring 12. In this case, the driving force required by the drive device 80 can be further reduced. Therefore, the drive device 80 can be further miniaturized, and the cost of the drive device 80 can be further reduced.

[0077] In addition, the volume in the rod chamber Cr changes with the movement of the driving rod 82 of the driving device 80 and the valve stem 40, and a positive or negative pressure can be generated in the oil retained in the rod chamber Cr. Under the action of the pressure acting in the rod chamber Cr, a pressing force toward one side or the other side is generated on the valve stem 40 via the other end surface 44. The valve stem 40 has a second connecting flow path (another flow path) 55, which opens at the other end surface 44 and communicates with the second chamber (another chamber) C2. In addition, the second action surface (another action surface) 50b of the valve stem large diameter portion 50 of the valve stem 40 faces the second chamber C2. As a result, the same pressure as the pressure acting on the other end surface 44 of the valve stem 40 acts on the second action surface 50b. That is, under the action of the pressure acting on the second chamber C2, a pressing force toward the other side or one side is generated on the valve stem 40 via the second action surface 50b. Therefore, the pressing force toward the other side or one side generated on the valve spool 40 by the second action surface 50b cancels (cancels out) at least a part of the pressing force toward one side or the other side by the other end surface 44. Thus, the pressing force acting on the valve spool 40 due to the pressure in the rod chamber Cr can be effectively reduced, and the valve spool 40 can be stably operated.

[0078] In particular, in the flow control valve 10 of the present embodiment, the area of ​​the other end face 44 and the area of ​​the second action face 50b are equal to each other. In this case, the pressing force toward one side by the other end face 44 and the pressing force toward the other side by the second action face 50b cancel each other out. Therefore, the valve rod 40 can be operated more stably.

[0079] Furthermore, in the flow control valve 10 of the present embodiment, the second chamber C2 is always connected to the drain flow path 97 via the second through hole 39 of the spool housing block 30, the second outer peripheral groove 37, the second through hole 27 of the housing 20, and the second inner peripheral groove 94 of the mounted member 90. As a result, the oil retained in the rod chamber Cr and the second chamber C2 is discharged to the drain flow path 97, and the hydraulic pressure does not act on the rod chamber Cr and the second chamber C2. Therefore, the spool 40 can be operated more stably.

[0080] When the spool 40 moves toward the forward position, the notch 48 provided continuously to the outer peripheral groove 47 of the spool 40 communicates with the pressure chamber Cp. Thus, the pressure chamber Cp communicates with the third chamber C3 via the notch 48. As described above, the third chamber C3 is always communicated with the control flow path 96. That is, when the spool 40 moves toward the forward position, the pressure chamber Cp communicates with the control flow path 96 via the third chamber C3. When the pressure chamber Cp communicates with the control flow path 96, the oil in the pressure chamber Cp flows toward the control flow path 96, and the pressure in the pressure chamber Cp drops sharply. Therefore, in the present embodiment, the outer peripheral groove 47 and the notch 48 constitute a pressure chamber connecting flow path, and when the spool body 46 moves from the other side to the one side by the driving force of the driving part 84 (solenoid) of the driving device 80, the pressure chamber connecting flow path can control the flow rate of oil from the pressure chamber Cp to the control flow path 96 whose flow rate should be controlled. On the other hand, the throttle portion 68 of the poppet valve 60 limits the flow rate per unit time of the oil flowing from the pressure source flow path 95 toward the pressure chamber Cp.

[0081] If the force pressing the lift valve 60 to one side caused by the pressure in the pressure chamber Cp and the pressing force of the lift valve pressing spring 14 is smaller than the force pressing the lift valve 60 to the other side caused by the pressure of the pressure source flow path 95, the lift valve 60 moves to the other side along the axial direction da and the mounting surface 63 of the lift valve 60 is separated from the seat portion 25 of the housing 20. As a result, the pressure source port 22 of the housing 20 is connected to the inner peripheral groove 24 via the notch portion 69 of the lift valve 60. That is, the pressure source flow path 95 and the control flow path 96 are connected via the pressure source port 22, the notch portion 69, the inner peripheral groove 24, the control port 23 and the first inner peripheral groove 93 of the mounted component 90. As a result, the flow control valve 10 becomes Figure 3 In the flow state shown, oil flows from the pressure source flow path 95 toward the control flow path 96 .

[0082] At this time, the pressure chamber Cp is connected to the control flow path 96, so the oil flowing from the pressure source flow path 95 to the control flow path 96 also flows into the pressure chamber Cp, and the pressure in the pressure chamber Cp rises. If the force that presses the poppet valve 60 to one side due to the pressure in the pressure chamber Cp and the pressing force of the poppet valve pressing spring 14 exceeds the force that presses the poppet valve 60 to the other side due to the pressure in the pressure source flow path 95, the poppet valve 60 moves to one side, and the opening area between the pressure source flow path 95 and the control flow path 96 via the notch portion 69 of the poppet valve 60 decreases. As a result, the notch portion 69 of the poppet valve 60 functions as an orifice, and the flow rate of the oil flowing from the pressure source flow path 95 to the control flow path 96 decreases, and the pressure in the control flow path 96 and the pressure chamber Cp decreases. At the same time, the poppet valve 60 moves to the other side, and the opening area between the pressure source flow path 95 and the control flow path 96 via the notch portion 69 of the poppet valve 60 increases. Then, the poppet valve 60 stops at a position where the force pressing the poppet valve 60 to one side by the pressure in the pressure chamber Cp and the pressing force of the poppet valve pressing spring 14 is balanced with the force pressing the poppet valve 60 to the other side by the pressure of the pressure source flow path 95, and the oil flows from the pressure source flow path 95 to the control flow path 96 at a flow rate corresponding to the opening area between the pressure source flow path 95 and the control flow path 96 based on the notch portion 69 at this time. The stop position of the poppet valve 60 can be controlled by controlling the protrusion amount of the drive rod 82 to one side along the axial direction da using the drive unit 84 of the drive device 80. That is, by controlling the protrusion amount of the drive rod 82 to one side along the axial direction da, the flow rate of the oil flowing from the pressure source flow path 95 to the control flow path 96 can be controlled.

[0083] Next, the action for transitioning the flow control valve 10 from the flowing state to the closed state again will be described. If the driving rod 82 of the driving device 80 is retreated to the other side, the valve column 40 retreats toward the retreat position due to the pressing force of the valve column pressing spring 12, and the pressure chamber Cp and the third chamber C3 are closed by the valve column 40. After that, oil flows from the pressure source flow path 95 into the pressure chamber Cp via the throttling portion 68 of the lift valve 60, so that the pressure in the pressure chamber Cp rises. If the force pressing the lift valve 60 to one side caused by the pressure in the pressure chamber Cp and the lift valve pressing spring 14 exceeds the force pressing the lift valve 60 to the other side caused by the pressure of the pressure source flow path 95, the lift valve 60 moves to one side and is pressed against the seat 25 of the housing 20. As a result, the flow control valve 10 returns to the closed state. Figure 2 Shown in closed state.

[0084] The flow control valve 10 of the present invention comprises: a valve column receiving block 30, which has a valve column receiving hole 31; and a valve column 40, which has: a valve column main body 46; a valve column large diameter portion 50, which has a diameter larger than the diameter of the valve column main body 46; and a flow path 51, which opens at one end side in the axial direction da and is connected to a chamber C1, and the chamber C1 is located between a portion of the valve column main body 46 that is located on the other end side of the axial direction da than the valve column large diameter portion 50 and the valve column receiving block 30, and the valve column 40 is movably received in the valve column receiving hole 31.

[0085] In addition, the flow control valve 10 of the present invention comprises: a valve column receiving block 30, which has a valve column receiving hole 31; and a valve column 40, which has: a valve column main body 46, which has an end face 41 located at one end of the axial direction da; a valve column large diameter portion 50, which has a diameter larger than the diameter of the valve column main body 46, is located in the middle of the other end away from the one end and the axial direction da, and has an action surface 50a facing the other end side and another action surface 50b facing the one end side, and the area of ​​the one end face 41 is equal to the area of ​​the action surface 50a The areas are the same; a flow path 51, which opens at one end and is connected to a chamber C1, which is located between a portion of the valve post main body 46 that is closer to the other end side than the valve post large diameter portion 50 and the valve post receiving block 30; and another flow path 55, which opens at the other end side and is connected to another chamber C2, which is located between a portion of the valve post main body 46 that is closer to one end side than the valve post large diameter portion 50 and the valve post receiving block 30, and the valve post 40 can move in the valve post receiving hole 31 by using the driving force of the solenoid.

[0086] In addition, the flow control valve 10 of the present invention comprises: a valve column 40, which has: a valve column body 46, which is configured to be movable to one side and the other side along the axial direction da; and a valve column large diameter portion 50, which has a diameter larger than the diameter of the valve column body 46; a pressure chamber Cp, at least a part of which is divided by an end of one side of the valve column body 46, generating a pressing force that presses the valve column body 46 from one side toward the other side; a chamber C1, at least a part of which is formed by the valve column body 46 at a position larger than the valve column large diameter portion 50; The portion 50 is divided into two parts near the other end side to generate another pressing force, which presses the large diameter portion 50 of the valve column from the other side to one side, eliminating at least a part of the pressing force brought by the pressure chamber Cp; and a pressure chamber connecting flow path (47, 48), when the valve column main body 46 is driven by the solenoid (driving part 84) and moves from the other side to one side, the pressure chamber connecting flow path (47, 48) can control the flow of oil from the pressure chamber Cp toward the control flow path 96 where the flow should be controlled.

[0087] According to such a flow control valve 10, the same pressure as the pressure acting on one end side of the valve stem 40 acts on the portion of the valve stem 40 facing the chamber C1, and a pressing force toward one side of the axial direction da is generated on the valve stem 40. Therefore, the pressing force toward one side generated on the portion of the valve stem 40 facing the chamber C1 cancels at least a part of the pressing force toward the other side generated on one end side of the valve stem 40 (cancels each other). Thus, the pressing force that presses the valve stem 40 toward the other side due to the pressure acting on one end side of the valve stem 40 can be effectively reduced, and the driving force required for the driving device 80 can be reduced. Therefore, the driving device 80 can be miniaturized, and the cost of the driving device 80 can be reduced.

[0088] In the flow control valve 10 of the present invention, the valve stem body 46 has an end surface 41 located at one end, and the valve stem large diameter portion 50 has an action surface 50a facing the other end. The area of ​​the end surface 41 is the same as the area of ​​the action surface 50a.

[0089] According to such a flow control valve 10, the pressing force toward the other side by means of the one end surface 41 and the pressing force toward one side by means of the action surface 50a cancel each other out. Therefore, only the pressing force of the valve column pressing spring 12 becomes the pressing force that presses the valve column 40 toward the other side. That is, the drive device 80 can move the valve column 40 toward the forward position only by pressing the valve column 40 by overcoming the pressing force of the valve column pressing spring 12. In this case, the driving force required by the drive device 80 can be further reduced. Therefore, the drive device 80 can be further miniaturized, and the cost of the drive device 80 can be further reduced.

[0090] In the flow control valve 10 of the present invention, the spool large diameter portion 50 is located in the middle between one end and the other end away from the spool 40 .

[0091] According to such a flow control valve 10, the area of ​​the one end surface 41 and the area of ​​the action surface 50a can be adjusted independently of each other, thereby increasing the degree of freedom in designing the spool 40. Thus, the area of ​​the one end surface 41 and the area of ​​the action surface 50a can be easily made the same.

[0092] In the flow control valve 10 of the present invention, the valve column large diameter portion 50 has another acting surface 50b facing one end side, and the valve column 40 has another flow path 55, which opens at the other end side of the valve column 40 and is connected to another chamber C2, and the other chamber C2 is located between the valve column main body 46, which is closer to one end side than the valve column large diameter portion 50, and the valve column receiving block 30.

[0093] According to such a flow control valve 10, the same pressure as the positive or negative pressure acting on the other end side of the spool 40 acts on the portion of the spool 40 facing the other chamber C2, and a pressing force toward the other side or one side of the axial direction da is generated on the spool 40. Therefore, the pressing force toward the other side or one side generated on the spool 40 by the other action surface 50b cancels at least a part of the pressing force toward the one side or the other side by the other end side of the spool 40 (cancels each other). As a result, the pressing force acting on the spool 40 due to the pressure in the rod chamber Cr can be effectively reduced, and the spool 40 can be stably operated.

[0094] In the flow control valve 10 of the present invention, the spool 40 moves in the spool accommodation hole 31 by the driving force of the solenoid.

[0095] Generally speaking, an electromagnetic actuator that can output a large driving force is large and expensive. In contrast, according to the flow control valve 10 of the present invention, the driving force required to move the valve column 40 can be reduced. Therefore, when the valve column 40 moves in the valve column receiving hole 31 using the driving force of the solenoid, a small and inexpensive electromagnetic actuator with a relatively small driving force can be used as a driving source for the valve column 40.

Claims

1. A flow control valve comprising: A valve post receiving block having a valve post receiving hole; The valve stem comprises: a valve stem main body; a valve stem large diameter portion having a diameter larger than that of the valve stem main body; and a flow path which opens on the side of one end of the valve post in the axial direction and communicates with a chamber, at least a portion of which is formed by a portion of the valve post body which is located on the side of the other end in the axial direction relative to the valve post large diameter portion and the valve post receiving block, and the valve post is movably received in the valve post receiving hole; a housing having a pressure source port communicating with a pressure source flow path and accommodating the valve rod; as well as A poppet valve is housed in the housing and closes and opens the pressure source port.

2. The flow control valve according to claim 1, wherein: The valve stem body has an end surface located at the one end. The large diameter portion of the valve stem has an action surface facing the other end. The area of ​​the one end surface is the same as the area of ​​the active surface.

3. The flow control valve according to claim 1, wherein: The large-diameter portion of the valve stem is located in a middle portion of the valve stem away from the one end and the other end.

4. The flow control valve according to claim 1, wherein: The large diameter portion of the valve stem has another action surface on the side facing the one end. The valve column has another flow path, which opens on the side of the other end of the valve column and is connected to another chamber. The other chamber is located between the part of the valve column body that is closer to the one end than the large diameter part of the valve column and the valve column receiving block.

5. The flow control valve according to claim 1, wherein: The valve rod moves in the valve rod accommodation hole by the driving force of the solenoid.

6. A flow control valve comprising: A valve post receiving block having a valve post receiving hole; A valve column, comprising: a valve column main body, which has an end face located at one end in the axial direction of the valve column; a valve column large diameter portion, which has a diameter larger than that of the valve column main body, is located in the middle portion away from the one end and the other end in the axial direction, and has an action surface on the side facing the other end and another action surface on the side facing the one end, and the area of ​​the one end face is the same as the area of ​​the action surface; a flow path, which opens on the side of the one end and is connected to a chamber, at least a part of which is formed by dividing the portion of the valve column main body on the side closer to the other end than the valve column large diameter portion and the valve column receiving block; and another flow path, which opens on the side of the other end and communicates with another chamber, at least a part of which is formed by a portion of the valve post body that is located on the side closer to the one end than the valve post large diameter portion and the valve post receiving block, and the valve post can move in the valve post receiving hole by the driving force of the solenoid; a housing having a pressure source port communicating with a pressure source flow path and accommodating the valve rod; as well as A poppet valve is housed in the housing and closes and opens the pressure source port.

7. A flow control valve comprising: A valve stem having: a valve stem main body configured to be movable to one side and the other side along the axial direction of the valve stem; and a valve stem large diameter portion having a diameter larger than that of the valve stem main body; a pressure chamber, at least a portion of which is formed by dividing the end of the one side of the valve stem body, and generating a pressing force for pressing the valve stem body from the one side toward the other side; A chamber, at least a part of which is formed by dividing the valve stem main body portion located closer to the other side than the valve stem large diameter portion, generates another pressing force, which presses the valve stem large diameter portion from the other side toward the one side, eliminating at least a part of the pressing force brought by the pressure chamber; A pressure chamber connecting flow path, which can control the flow rate of oil from the pressure chamber to the control flow path whose flow rate needs to be controlled after the valve stem body moves from the other side to the one side due to the driving force of the solenoid; a housing having a pressure source port communicating with a pressure source flow path and accommodating the valve rod; as well as A poppet valve is housed in the housing and closes and opens the pressure source port.

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