KR20200099092A - Flow control valve - Google Patents

Abstract

The present invention relates to a flow control valve capable of operating with a relatively small force. The flow control valve (10) includes: a spool receiving block (30) having a spool receiving hole (31); and a spool (40) that includes a spool main body part (46), a spool large-diameter part (50) having a diameter larger than the diameter of the spool main body part (46), is open at one end in the axial direction (da) and has a part that is closer to the other end in the axial direction (da) than the spool large-diameter part (50) of the spool main body part (46), has a flow path (51) passing through the thread (C1) positioned between the spool receiving blocks (30), and is movably received into the spool receiving hole (31).

Description

Flow control valve

The present invention relates to a flow rate control valve that controls the flow rate of a flowing fluid.

Conventionally, in various fluid circuits, a flow control valve for controlling the flow rate of a fluid flowing in the fluid circuit has been used. For example, in a working machine such as a construction vehicle driven using hydraulic pressure, a hydraulic circuit for supplying hydraulic oil to each hydraulic actuator of the working machine or a pilot pressure for operating a hydraulic device such as a directional valve is supplied. A flow control valve for controlling the flow rate of oil flowing in the hydraulic circuit is used as a hydraulic circuit for this purpose.

JP2010-144928A discloses an electro-hydraulic pilot valve including a solenoid actuator, a pilot body and a pilot poppet. In this electrohydraulic pilot valve, the internal pressure of the first control chamber is communicated to the pilot control chamber through a control path provided in the pilot poppet. At this time, the tip of the pilot body closes the pilot passage provided in the pilot piston to block the flow of liquid between the pilot control chamber and the outlet. The trapped pressure presses the pilot poppet against the pilot poppet seat. Thereby, the flow between the inlet and the outlet of the electrohydraulic pilot valve is blocked. When the solenoid actuator is excited, the pilot body moves upward to open the pilot passage, and the pressure in the pilot control chamber is released to the discharge passage. When the opening between the pilot control chamber and the pilot passage reaches a predetermined size, the pilot poppet moves after the pilot body. This movement returns the tip of the pilot body toward the pilot passage, reducing the flow through the pilot passage. When the flow of the pilot passage is in equilibrium, the pilot poppet stops its movement and maintains the open position.

According to such an electro-hydraulic pilot valve, there is an advantage in that the flow of liquid passing through the electro-hydraulic pilot valve can be proportionally controlled by selectively controlling the current applied to the solenoid actuator.

However, in the control valve disclosed in JP2010-144928A, the pilot body receives a pressure in the pilot control chamber at its tip, that is, the internal pressure of the first control chamber communicated through the control path. Since the internal pressure of the first control chamber is relatively high, a large force is required to move the pilot body against the internal pressure of the first control chamber. Therefore, it is necessary to use a solenoid actuator capable of generating a large driving force as a solenoid actuator for generating a driving force for driving a pilot body. In this case, there is a problem that the entire electrohydraulic pilot valve is enlarged and the cost is increased.

The present invention has been made in consideration of these points, and an object of the present invention is to provide a flow control valve capable of being operated with a relatively small force.

The flow control valve according to the present invention,

A spool receiving block having a spool receiving hole,

The spool body portion, the spool large-diameter portion having a diameter larger than the diameter of the spool body portion, and a portion that is open to one end side in the axial direction and becomes the other end side in the axial direction than the spool large-diameter portion of the spool body portion, and the spool A spool that has a flow path through the thread positioned between the accommodation blocks, and is movably accommodated into the spool accommodation hole.

Equipped.

In the flow control valve according to the present invention,

The spool body portion has one end surface positioned at the one end,

The spool large diameter portion has an action surface facing the other end side,

The area of the one end surface and the area of the action surface may be the same.

In the flow control valve according to the present invention,

The spool large diameter portion may be located at an intermediate portion spaced apart from the one end and the other end of the spool.

In the flow control valve according to the present invention,

The spool large diameter portion has another working surface facing the one end side,

The spool may be opened to the other end side of the spool, and may have a portion that becomes the one end side rather than the spool large diameter portion of the spool body portion and another flow path through which another thread is located between the spool receiving block.

In the flow control valve according to the present invention,

The spool may move within the spool accommodation hole by the driving force of the solenoid.

The flow control valve according to the present invention,

A spool receiving block having a spool receiving hole,

The spool body portion having one end surface positioned at one end in the axial direction, the spool body portion having a diameter larger than the diameter of the spool body portion, and positioned at an intermediate portion spaced apart from the one end and the other end in the axial direction, and an action surface facing the other end side, and the A spool large-diameter portion having another working surface facing one end, and having the same area of the one end surface and the working surface area, and the other end side of the spool body portion than the spool large-diameter portion while opening to the one end side A flow path through the thread positioned between the portion and the spool receiving block, and open to the other end side, and communicating with the portion at the one end side of the spool body portion and the other thread positioned between the spool receiving block. A spool that has a different flow path and is movable within the spool receiving hole by the driving force of the solenoid.

Equipped.

The flow control valve according to the present invention,

A spool having a spool body portion disposed to be movable to one side and the other side along the axial direction, and a spool large-diameter portion having a diameter larger than that of the spool body portion;

A pressure chamber that is at least partially partitioned from an end portion of the one side of the spool main body to generate a pressing force for pressing the spool main unit from the one side toward the other side;

At least a part of the spool body portion is partitioned at a portion that is on the other end side than the spool large diameter portion, and the spool large diameter portion is pressed from the other side toward the one side, thereby generating another pressing force that removes at least a part of the pressing force by the pressure chamber. The fruit to let,

When the spool body part moves from the other side to the one side by receiving the driving force of the solenoid, a pressure chamber communication flow path capable of controlling a flow rate of oil from the pressure chamber toward a control flow path to be controlled is provided.

According to the present invention, it is possible to provide a flow control valve capable of operating with a relatively small force.

1 is a diagram for explaining an embodiment according to the present invention, and is a cross-sectional view showing a flow rate control valve in a state installed on a member to be installed.
FIG. 2 is an enlarged view of a portion to which II in FIG. 1 is applied, and shows a flow control valve in a closed state.
Fig. 3 is a diagram corresponding to Fig. 2 and shows a flow rate control valve in a flow state.
4 is a longitudinal cross-sectional view showing the spool of the flow control valve.
5 is a longitudinal sectional view showing a cross section of a spool orthogonal to the cross section shown in FIG. 4.
6 is a cross-sectional view corresponding to the line VI-VI in FIG. 4.
7 is a cross-sectional view corresponding to the line VII-VII in FIG. 4.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, in the drawings attached to the present specification, for convenience of illustration and ease of understanding, the scale and the vertical and horizontal dimensional ratios, etc. are appropriately changed from those of the real thing and exaggerated.

In addition, the terms used in this specification to specify the shape and geometric conditions and their degree, for example, ``parallel'', ``orthogonal'', ``equal'', and the values of length and angle, etc. Without being constrained, it will be interpreted including the range of the degree to which the same function can be expected.

1 to 7 are views for explaining an embodiment according to the present invention. FIG. 1 is a cross-sectional view showing the flow rate control valve 10 in a state installed on a member to be installed 90, and FIGS. 2 and 3 are views showing enlarged portions of the portion II in FIG. 1. In FIG. 2, the flow control valve 10 is shown in a closed state, and in FIG. 3, the flow control valve 10 is shown in a circulating state.

The member to be installed 90 is a member to which the flow control valve 10 is installed. A flow control valve installation hole 92 in which the flow control valve 10 is installed is provided in the main body 91 of the member to be installed 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 installation hole 92 has a first inner circumferential groove 93 and a second inner circumferential groove 94 in order from the front end side (one side) of the flow control valve installation hole 92. The first inner circumferential groove 93 and the second inner circumferential groove 94 are formed in an annular shape along the circumferential direction of the flow control valve mounting hole 92, respectively. In the example shown in FIG. 1, the main body 91 has a pressure flow path 95 through the front end of the flow control valve mounting hole 92, a control flow path 96 through the first inner circumferential groove 93, and , A drain flow path 97 through the second inner circumferential groove 94 is provided. The pressure source flow path 95 is connected to a pressure source (not shown), and the control flow path 96 is connected to a hydraulic system (not shown). With the flow control valve 10 installed in the flow control valve mounting hole 92, the flow rate of fluid, particularly oil, flowing from the pressure source flow path 95 to the control flow path 96 is transferred to the flow control valve 10. Controlled by The drain flow path 97 passes through a tank (not shown), and the oil flowing into the drain flow path 97 is discharged to the tank.

The flow control valve 10 includes a spool receiving block 30 having a spool receiving hole 31 and a spool 40 accommodated in the spool receiving block 30 so as to be movable. The flow control valve 10 of this embodiment includes a casing 20 having a receiving hole 21, a poppet 60 accommodated in the casing 20, a spool pressing spring 12, and a poppet pressing spring 14. I have more.

In addition, in this specification, the "axis line direction (da)" refers to the direction in which the central axis line A of the spool 40 extends (longer direction of the spool 40). In addition, the front end side of the flow control valve 10 along the axis direction da (the side passing through the pressure source flow path 95, the lower side in FIGS. 1 to 5) is ``one side'', and the flow control valve along the axis direction da The base end side of (10) (the side connected to the drive device 80, the upper side in Figs. 1 to 5) is referred to as "the other side".

The casing 20 has a receiving hole 21 for accommodating at least a part of the spool receiving block 30, the spool 40, the poppet 60, the spool pressing spring 12, and the poppet pressing spring 14. . Casing 20, in the state in which the flow control valve 10 is installed in the flow control valve mounting hole 92, the pressure source port 22 through the pressure source flow path 95 and the control flow path 96 It has a control port (23). The pressure source port 22 extends along the axial direction da from the distal end (one end) of the accommodation hole 21. The control flow path 96 extends in a radial direction orthogonal to the axial direction da from the side surface of the accommodation hole 21. In the illustrated example, the casing 20 has a plurality of control ports 23 arranged along the circumferential direction around the central axis A of the spool 40. The accommodation hole 21 has an inner circumferential groove 24 passing through the control port 23. The inner circumferential groove 24 is formed in an annular shape along the circumferential direction of the accommodation hole 21. In the opening of the pressure source port 22 on the receiving hole 21 side (the other side), a seat portion 25 on which the seat surface 63 of the poppet 60 seats is provided. In the illustrated example, the seat portion 25 is located at a connection portion between the pressure source port 22 and the inner circumferential groove 24. The sheet portion 25 is formed of a surface extending in a direction inclined with respect to both the axial direction and the radial direction, and is formed in an annular shape along the circumferential direction of the accommodation hole 21. The casing 20 has a receiving hole 21 and a first through hole 26 and a second through hole 27 which pass through the outer surface of the casing 20. The first through hole 26 passes the receiving hole 21 and the inner circumferential groove 24 through a gap 16 formed between the inner surface of the flow control valve mounting hole 92 and the outer surface of the casing 20. . The second through-hole 27 is located on the other side of the first through-hole 26 and passes the accommodation hole 21 and the second inner circumferential groove 94.

The spool accommodating block 30 has a spool accommodating hole 31 extending in the axial direction and accommodating the spool 40. The spool accommodation hole 31 penetrates the spool accommodation block 30 along the axial direction da. A spring support surface 32 is formed at the tip of one side of the spool receiving block 30. The spring support surface 32 supports the poppet pressing spring 14 and receives a pressing force from the poppet pressing spring 14. In the illustrated example, the spool accommodating block 30 is composed of a first block 30a and a second block 30b positioned on the other side of the first block 30a. The spool accommodation hole 31 is provided over the first block 30a and the second block 30b. In the illustrated example, the spool accommodation hole 31 includes 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 each extend in the axial direction, and the first small-diameter hole 31a, the large-diameter hole 31b, and the second small-diameter hole ( The central axes of 31c) coincide with each other. Further, the center axis lines of the first small-diameter hole 31a, the large-diameter hole 31b, and the second small-diameter hole 31c coincide with the center axis A of the spool 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 diameter smaller 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 diameter smaller than the diameter of the large-diameter hole 31b. The large-small 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, but in the illustrated example, the diameter of the first small-diameter hole 31a is the second small-diameter hole 31c Is equal to the diameter of The diameters of the first small-diameter hole 31a and the second small-diameter hole 31c correspond to the diameter of the spool body portion 46 of the spool 40, and the diameter of the large-diameter hole 31b is the spool 40 Corresponds to the diameter of the spool large diameter portion 50 of.

A first inner circumferential groove 33 is provided in the first small-diameter hole 31a. Further, a 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 spool accommodation hole 31. On the outer surface of the spool accommodating hole 31, the first outer circumferential groove 36 through the first through hole 26 of the casing 20 and the second through hole 27 of the casing 20 The outer circumferential groove 37 is provided. The spool accommodation block 30 (the first block 30a) has a first through hole 38 extending in the radial direction and passing the first inner circumferential groove 33 and the first outer circumferential groove 36, and a radial direction It has a second through hole 39 that extends to and passes through the second inner circumferential groove 35 and the second outer circumferential groove 37. In the illustrated example, the spool receiving block 30 (first block 30a) has a plurality of first through holes 38 and a plurality of second through holes 39 arranged along the circumferential direction.

In the state where the flow control valve 10 is installed in the flow control valve installation hole 92 of the member to be installed 90, the casing 20 is fixed to the flow control valve installation hole 92 by screwing or the like, The spool receiving block 30 is fixed to the casing 20 by screwing or the like. Therefore, in the state where the flow control valve 10 is installed in the flow control valve installation hole 92 of the mounting member 90, the casing 20 and the spool accommodation block 30 are attached to the mounting member 90. Do not move against.

4 is a longitudinal sectional view showing the spool 40, and FIG. 5 is a longitudinal sectional view showing a cross section of the spool 40 orthogonal to the cross section shown in FIG. 4. The spool 40 has a central axis A extending in the longitudinal direction, and is accommodated in the spool receiving hole 31 of the spool receiving block 30 so as to be movable along the axis direction da. The central axis A of the spool 40 extends along the axis direction da. The spool 40 has one end face 41 positioned at one end (one end) along the axial direction da and the other end face 44 positioned at the other end (the other end). That is, one end surface 41 is a surface facing one side of the spool 40, and the other end surface 44 is a surface facing the other side of the spool 40. The one end surface 41 includes a protruding surface 42 protruding toward one side and a spring support surface 43 positioned around the protruding surface 42. The spring support surface 43 supports the spool pressing spring 12 and receives a pressing force from the spool pressing spring 12. The other end surface 44 has a cutout 45 which communicates with the 2nd communication flow path 55 mentioned later. The notch 45 is provided so that the drive rod 82 does not block the opening of the second communication flow path 55 when the drive rod 82 of the drive device 80 to be described later abuts the other end surface 44 do.

The spool 40 has a spool main body 46 and a spool large-diameter part 50 having a diameter larger than that of the spool main body 46. In the illustrated example, the spool large-diameter portion 50 is located at an intermediate portion spaced apart from one end and the other end of the spool 40. The spool main body 46 has an outer peripheral groove 47 positioned on one side of the spool large diameter portion 50. The outer circumferential groove 47 is formed in an annular shape along the circumferential direction of the spool main body 46. At the end of one end side of the outer circumferential groove 47, a notch 48 is formed in which the spool main body 46 is cut along the axial direction da. In this specification, one end of the spool 40 is referred to as "one end" and the other end is referred to as "the other end". Accordingly, in the spool 40, one side is sometimes referred to as "one end side" and the other side is referred to as "the other end side".

The spool 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 one end side. The first action surface 50a is at the edge portion on the other end side of the outer surface of the spool large-diameter portion 50 extending along the axial direction da, and a portion at the other end side of the spool large-diameter portion 50 of the spool body portion 46. It connects the outer surface of the inside. The second action surface 50b is at one end side edge portion of the outer surface of the spool large-diameter portion 50 extending along the axial direction da, and a portion at one end side than the spool large-diameter portion 50 of the spool body portion 46. It connects the outer surface of the inside. In the illustrated example, the area of the one end surface 41 of the spool 40 and the area of the first working surface 50a are equal to each other. In addition, the area of the other end surface 44 of the spool 40 and the area of the second action surface 50b are the same as each other. In addition, the areas of one end face 41, the other end face 44, the first action face 50a, and the second action face 50b here are each of the faces 41, 44, 50a, and 50b. , With respect to a plane orthogonal to the central axis A (axis direction da), when projected along the axis direction da, it is set as the area on the plane.

The spool large-diameter portion 50 is disposed in the large-diameter hole 31b of the spool accommodation hole 31. The diameters of the first small-diameter hole 31a and the second small-diameter hole 31c of the spool accommodation hole 31 are smaller than the diameter of the spool large-diameter portion 50. Accordingly, the spool large-diameter portion 50 is movable along the axial direction da over the inside of the large-diameter hole 31b and the second inner circumferential groove 35. More specifically, the spool 40 is a second action surface of the spool large-diameter portion 50 from a position where the first action surface 50a of the spool large-diameter portion 50 contacts the other end of the large-diameter hole 31b. It is movable along the axial direction da between 50b and a position contacting one end of the second inner circumferential groove 35.

In the example shown in Figs. 1 to 3, three spaces (first yarn C1, second yarn C2, and third yarn C3) are formed between the spool 40 and the spool receiving block 30. The first thread (thread) C1 is located between the portion of the spool main body 46 on the other end of the spool large diameter portion 50 and the spool receiving block 30. In the illustrated example, the first action surface 50a of the spool large-diameter portion 50 faces the first thread C1. In this case, the first thread C1 has a portion at the other end of the spool body portion 46 on the other end side of the spool large-diameter portion 50, the first acting surface 50a, and the spool receiving hole 31 of the spool receiving block 30. ). The second thread (another thread) C2 is located between the spool receiving block 30 and a portion of the spool main body 46 that is one end of the spool large-diameter portion 50. In the illustrated example, the second action surface 50b of the spool large-diameter portion 50 faces the second thread C2. In this case, the second thread C2 has a portion at the other end of the spool body portion 46 on the other end side of the spool large diameter portion 50, the second action surface 50b, and the spool accommodation hole 31 of the spool accommodation block 30. ). Particularly in the illustrated example, a portion of the spool receiving hole 31 defining the second thread C2 includes a second inner circumferential groove 35. The third thread C3 is located between the spool receiving block 30 and a portion of the spool body 46 that is one end side of the spool large diameter portion 50 on one side (one end side) of the second thread C2. In particular, in the illustrated example, the portion defining the third thread C3 of the spool body portion 46 includes an outer circumferential groove 47, and the portion defining the third thread C3 of the spool receiving hole 31 is the first inner circumferential portion. It includes a groove (33).

The spool 40 has a first communication flow path (flow path) 51 that is opened at one end side of the axial direction da and communicates with the first thread C1. In the illustrated example, the first communication flow path 51 is open to the one end surface 41 on the one end side of the spool 40. In particular, the first communication flow path 51 is opened in the protruding surface 42 of the one end surface 41. The first communication flow path 51 includes a first communication hole 52 located inside the spool 40 and a first communication groove 53 formed on the outer surface of the spool large-diameter portion 50. The first communication hole 52 is opened at one end side of the spool 40 and passes through the axial portion 52a extending along the central axis A and the other end side of the axial portion 52a, and the spool ( It includes a radial portion 52b extending in the radial direction of 40). The first communication groove 53 passes through the radially outer portion of the radially direction portion 52b of the first communication hole 52 and extends along the axial direction da. In the illustrated example, the radial portion 52b of the first communication hole 52 penetrates the spool large-diameter portion 50 through the other end-side end portion of the axial portion 52a. In other words, the radial portion 52b extends from the other end-side end portion of the axial portion 52a toward the opposite direction forming an angle of 180 degrees to each other. Then, the first communication groove 53 is connected to each of the two end portions of the radial portion 52b. That is, the spool 40 has two first communication grooves 53 positioned on opposite sides with respect to the central axis A. Further, the present invention is not limited thereto, and the spool 40 may have one first communication groove 53, or may have three or more first communication grooves 53.

The spool 40 has a second communication flow path (another flow path) 55 that opens to the other end side in the axial direction da and communicates with the second thread C2. In the illustrated example, the second communication flow path 55 is open to the other end surface 44 on the other end side of the spool 40. The second communication flow path 55 includes a second communication hole 56 positioned inside the spool 40 and a second communication groove 57 formed on the outer surface of the spool large-diameter portion 50. The second communication hole 56 is opened at the other end side of the spool 40 and passes through an axial portion 56a extending along the central axis A and one end of the axial portion 56a, and the spool ( It includes a radial portion 56b extending in the radial direction of 40). The second communication groove 57 passes through the radially outer portion of the radially direction portion 56b of the second communication hole 56 and extends along the axial direction da. In the illustrated example, the radial portion 56b of the second communication hole 56 penetrates the spool large-diameter portion 50 through the other end-side end portion of the axial portion 56a. In other words, the radial portion 56b extends from the other end-side end of the axial portion 56a toward opposite directions forming an angle of 180 degrees to each other. Then, the second communication groove 57 is connected to each of the two end portions of the radial portion 56b. That is, the spool 40 has two second communication grooves 57 positioned on opposite sides with respect to the central axis A. Further, the present invention is not limited thereto, and the spool 40 may have one second communication groove 57, or may have three or more second communication grooves 57.

6 is a cross-sectional view corresponding to the line VI-VI in FIG. 4, and FIG. 7 is a cross-sectional view corresponding to the line VII-VII in FIG. 4. In the illustrated example, when viewed along the axial direction da, the radial portion 52b of the first contact hole 52 and the radial portion 56b of the second contact hole 56 extend perpendicular to each other. Has become. Accordingly, the first communication groove 53 and the second communication groove 57 are spaced apart from each other at an angle of 90 degrees in the circumferential direction of the spool 40. Accordingly, the first communication flow path 51 and the second communication flow path 55 form a flow path independent from each other.

The poppet 60 is disposed so as to be movable in the axial direction da inside the accommodation hole 21 of the casing 20. The poppet 60 includes a body 61 that closes and opens the pressure source port 22 of the casing 20, and a ball 70 and a support member 71 accommodated in the body 61. The main body 61 has a small diameter portion 61a positioned in the pressure source port 22 in the closed state of the pressure source port 22, and a large diameter portion 61b positioned on the other side of the small diameter portion 61a. have. The main body 61 has a tip end surface 62 positioned at one end of the small-diameter portion 61a. Between the small-diameter portion 61a and the large-diameter portion 61b on the outer surface of the main body 61, a sheet surface 63 that seats on the seat portion 25 of the casing 20 in the closed state is formed. . The seat surface 63 is constituted by a surface extending in a direction inclined with respect to both the axial direction and the radial direction, and is formed in an annular shape along the circumferential direction of the poppet 60.

In the large-diameter portion 61b, there is provided a spring accommodation hole 64 which is opened on the other side of the poppet 60 and accommodates at least a part of the spool pressing spring 12 and the poppet pressing spring 14. A spring support surface 64a is formed at an end of one side of the spring receiving hole 64. The spring support surface 64a supports the poppet pressing spring 14 and receives a pressing force from the poppet pressing spring 14.

The main body 61 further includes a support member accommodation hole 65, a ball accommodation hole 66, a communication hole 67, and a throttle part 68. The support member accommodation hole 65 is opened in the spring accommodation hole 64 on the other side to accommodate the support member 71. The ball receiving hole 66 is opened to the support member receiving hole 65 on the other side to accommodate the ball 70. The communication hole 67 is opened in the support member accommodation hole 65 on the other side and communicates with the throttle part 68 on one side. The throttle portion 68 is opened in the communication hole 67 on the other side, and is opened in the tip end surface 62 on one side. A notch 69 is formed outside the distal end surface 62 in the radial direction.

The support member 71 includes a protruding surface 72 protruding to the other side on a surface facing the other side, and a spring support surface 73 positioned around the protruding surface 72. The spring support surface 73 supports the spool pressing spring 12 and receives a pressing force from the spool pressing spring 12. The support member 71 further has a through hole 74 extending along the central axis A and a notch 75 passing through the through hole 74. The through hole 74 extends along the central axis A, and is open to the protruding surface 72 on the other side of the support member 71. The cutout 75 is provided on one side of the support member 71 and is constituted by a groove-shaped cutout extending in the radial direction of the support member 71. The notch 75 passes through the through hole 74 on the inner side in the radial direction, and passes through the outer surface of the support member 71 on the outer side in the radial direction. In addition, the cutout 75 does not necessarily need to be connected to the outer surface of the support member 71 in the radial direction outside. In the cutout portion 75, even when the ball 70 is in contact with the through hole 74 of the support member 71, the through hole 74 is not completely blocked by the ball 70, and the ball receiving hole 66 As long as the through hole 74 is made to pass through the cutout 75, the specific shape is not specifically limited.

The throttle part 68 functions as a throttle for limiting the flow rate per unit time of oil flowing from the pressure source port 22 of the casing 20 toward the communication hole 67. Therefore, the cross-sectional area of the throttle portion 68 is sufficiently small compared to the cross-sectional area of the communication hole 67.

The ball 70 is accommodated in the ball receiving hole 66 and is movable within the ball receiving hole 66. The diameter of the ball 70 is smaller than the diameter of the ball receiving hole 66 and larger than the diameter of the communication hole 67. Therefore, the whole of the ball 70 does not enter the contact hole 67. Thereby, the ball 70 functions as a check valve in cooperation with the communication hole 67. Specifically, the ball 70 allows the flow of oil from the contact hole 67 toward the ball receiving hole 66. On the other hand, when oil is about to flow from the ball receiving hole 66 toward the communication hole 67, the ball 70 closes the opening of the other side of the communication hole 67. Therefore, the flow of oil from the ball receiving hole 66 toward the contact hole 67 is not allowed.

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 the spring supporting surface 43 of the spool 40 and the spring supporting surface 73 of the supporting 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.

Between the spool receiving block 30 and the poppet 60, a poppet pressing spring 14 is disposed. In the illustrated example, the poppet pressing spring 14 is disposed in a compressed state between the spring supporting surface 32 of the spool receiving block 30 and the spring supporting surface 64a of the poppet 60. Accordingly, the pressing force from the poppet pressing spring 14 acts on the spring support surfaces 32 and 64a, respectively.

Between the spool receiving block 30 and the poppet 60, a pressure chamber Cp is formed. In the pressure chamber Cp, the pressure source port 22 of the casing 20, the throttle portion 68 of the poppet 60, the contact hole 67, the ball receiving hole 66, the support member receiving hole, and the spring receiving hole ( Oil flows in from the pressure source flow path 95 of the member to be installed 90 through 64.

Between the flow control valve mounting hole 92 of the mounting member 90 and the outer surface of the casing 20, and between the receiving hole 21 of the casing 20 and the outer surface of the spool accommodation block 30, the oil A sealing member 18 such as an O-ring for preventing leakage is disposed.

The movement of the spool 40 along the axial direction da is controlled by the drive device 80. The drive device 80 has a drive rod 82 and a drive unit 84. In the illustrated example, the driving unit 84 drives the driving rod 82 toward one side along the axial direction da by the driving force generated by the solenoid. The drive rod 82 abuts against the other end surface 44 of the spool 40 and moves the spool 40 along the axial direction da. That is, in the illustrated example, the spool 40 moves in the spool receiving hole 31 along the axial direction da by the driving force of the solenoid. Further, the present invention is not limited thereto, and the drive unit 84 may be configured to drive the drive rod 82 by another driving force such as a pilot pressure. Further, a rod chamber Cr surrounded by the drive device 80 and the flow control valve 10 is formed in the coupling portion between the drive device 80 and the flow control valve 10. In the illustrated example, the load chamber Cr is defined by the drive device 80 and the spool receiving block 30 (second block 30b). In the rod chamber Cr, the drive rod 82 of the drive device 80 and the other end (the other end face 44) of the spool 40 are disposed.

Next, the operation of the flow control valve 10 of the present embodiment will be described with reference to FIGS. 2 and 3.

As shown in FIG. 2, when the drive rod 82 of the drive device 80 is most retracted, that is, when the drive rod 82 is located on the other side, the spool 40 is a spool compression spring 12 It is located on the other side (retreat position) by the pressing force of ). Specifically, the pressing force of the spool pressing spring 12 acts on the spring support surface 43 of the spool 40, whereby the spool 40 is located in the retracted position. At this time, the other end surface 44 of the spool 40 is in contact with the drive rod 82 of the drive device 80.

At this time, the second thread C2 formed between the spool 40 and the spool receiving block 30 is the second through hole 39, the second outer circumferential groove 37, and the casing 20 of the spool receiving block 30. It communicates with the drain flow path 97 through the 2nd through hole 27 of and the 2nd inner peripheral groove 94 of the member to be installed 90. In addition, the 3rd thread C3 is the 1st through hole 38 of the spool accommodation block 30, the 1st outer circumferential groove 36, the 1st through hole 26 of the casing 20, and the flow control valve installation hole ( It communicates with the control flow path 96 through the gap 16 formed between the inner surface of 92 and the outer surface of the casing 20 and the 1st inner circumferential groove 93 of the mounting member 90. The spool 40 closes the space between the pressure chamber Cp and the third chamber C3.

In the pressure chamber Cp, the pressure source port 22 of the casing 20, the throttle portion 68 of the poppet 60, the contact hole 67, the ball receiving hole 66, the support member receiving hole, and the spring receiving hole ( Oil flows in from the pressure source flow path 95 of the member to be installed 90 through 64. The throttle part 68 limits the flow rate per unit time of oil flowing from the pressure source port 22 toward the communication hole 67. Therefore, when a high hydraulic pressure acts on the pressure source flow path 95, the same hydraulic pressure as the pressure source flow path 95 acts in the pressure chamber Cp after a certain period of time.

On the surface of the poppet 60 facing the other side (the other side surface) of the large diameter portion 61b, a pressing force for pressing the poppet 60 toward one side by the pressure in the pressure chamber Cp acts. Further, a pressing force that presses the poppet 60 toward the other side by the pressure in the pressure source flow path 95 acts on the surface (one side) of the small-diameter portion 61a. The area of the other side surface of the large-diameter portion 61b is the area on the plane when the large-diameter portion 61b is projected along the axial direction da with respect to a plane orthogonal to the central axis A (axis direction da). Is equivalent to In addition, the area of one side surface of the small-diameter part 61a is on the plane when the small-diameter part 61a is projected along the axial direction da with respect to a plane orthogonal to the central axis A (axis direction da). It is equal to the area in In the illustrated example, the area of the other side surface of the large-diameter portion 61b is larger than the area of one side surface of the small-diameter portion 61a. Accordingly, the pressing force acting on the other side of the large diameter portion 61b, pressing the poppet 60 toward one side, is greater than the pressing force acting on one side of the small diameter portion 61a, pressing the poppet 60 toward the other side. . Further, the poppet 60 receives a pressing force for pressing the poppet 60 toward one side from the poppet pressing spring 14 through the spring support surface 73 of the support member 71. Thereby, the poppet 60 is the difference between the pressing force for pressing the poppet 60 toward one side by the pressure in the pressure chamber Cp and the pressing force for pressing the poppet 60 toward the other side by the pressure in the pressure source flow path 95 And it is pressed against the seat portion 25 of the casing 20 by the pressing force received from the poppet pressing spring 14. In more detail, the seat surface 63 of the poppet 60 is pressed against the seat portion 25 of the casing 20. At this time, as shown in FIG. 2, the poppet 60 is located at the most one side (closed position), and the flow control valve 10 closes the flow path from the pressure source flow path 95 to the control flow path 96. State.

Next, an operation for shifting the flow control valve 10 from the closed state to the circulating state will be described. When the driving unit 84 of the driving device 80 is driven to move the driving rod 82 toward one side along the axis direction da, the spool 40 is also pressed by the driving rod 82 to one side (advancing) along the axis direction da. Location). In this embodiment, the drive unit 84 includes a solenoid actuator, and the drive rod 82 moves toward one side by the driving force generated by the solenoid actuator.

By the pressure acting in the pressure chamber Cp, a pressing force is generated in the spool 40 toward the other side through the one end 41. The spool 40 has a first communication flow path (flow path) 51 that is open to one end surface 41 and communicates with the first thread (thread) C1. Moreover, the 1st action surface (action surface) 50a of the spool large diameter part 50 of the spool 40 faces the 1st thread C1. Thereby, a pressure equal to the pressure acting on the one end surface 41 of the spool 40 acts on the first working surface 50a. That is, by the pressure acting on the first thread C1, a pressing force toward one side is generated in the spool 40 through the first acting surface 50a. Accordingly, the pressing force toward one side generated through the first working surface 50a with respect to the spool 40 removes (cancells) at least a portion of the pressing force toward the other side through the one end surface 41. Thereby, it is possible to effectively reduce the pressing force that presses the spool 40 toward the other side, which is generated by the pressure in the pressure chamber Cp, and it becomes possible to reduce the driving force required for the drive device 80. Therefore, the drive device 80 can be downsized and the cost of the drive device 80 can be reduced.

In particular, in the flow rate control valve 10 of the present embodiment, the area of the end surface 41 and the area of the first action surface 50a are the same as each other. In this case, the pressing force toward the other side through the one end surface 41 and the pressing force toward one side through the first action surface 50a cancel each other. Therefore, only the pressing force of the spool pressing spring 12 becomes a pressing force for pressing the spool 40 toward the other side. That is, the drive device 80 can move the spool 40 toward the forward position only by pressing the spool 40 against the pressing force of the spool pressing spring 12. In this case, it becomes possible to further reduce the driving force required for the drive device 80. Therefore, the drive device 80 can be further downsized, and the cost of the drive device 80 can be further reduced.

Further, as the drive rod 82 and the spool 40 of the driving device 80 move, the volume in the load chamber Cr fluctuates, and a positive or negative pressure may be generated in the oil held in the load chamber Cr. By the pressure acting in the rod chamber Cr, a pressing force is generated in the spool 40 toward one side or the other side through the other end surface 44. The spool 40 has a second communication flow path (another flow path) 55 that is open to the other end surface 44 and communicates with the second thread (other yarn) C2. Further, the second working surface (another working surface) 50b of the spool large-diameter portion 50 of the spool 40 faces the second thread C2. As a result, a pressure equal to the pressure acting on the other end surface 44 of the spool 40 acts on the second action surface 50b. That is, by the pressure acting on the second thread C2, a pressing force is generated in the spool 40 toward the other side or one side through the second action surface 50b. Accordingly, the pressing force toward the other side or one side generated through the second working surface 50b with respect to the spool 40 removes (offsets) at least a part of the pressing force toward one side or the other side through the other end surface 44. . Thereby, the pressing force acting on the spool 40 generated by the pressure in the rod chamber Cr can be effectively reduced, and the spool 40 can be stably operated.

In particular, in the flow control valve 10 of the present embodiment, the area of the other end surface 44 and the area of the second action surface 50b are the same. In this case, the pressing force toward one side through the other end surface 44 and the pressing force toward the other side through the second action surface 50b cancel each other. Therefore, it becomes possible to operate the spool 40 more stably.

In addition, in the flow control valve 10 of this embodiment, the 2nd thread C2 is the 2nd through hole 39 of the spool accommodation block 30, the 2nd outer circumferential groove 37, and the 2nd of the casing 20 It always communicates with the drain flow path 97 through the through hole 27 and the 2nd inner circumferential groove 94 of the member 90 to be installed. As a result, the oil held in the rod chamber Cr and the second chamber C2 is discharged to the drain passage 97, and hydraulic pressure does not act in the load chamber Cr and the second chamber C2. Therefore, it becomes possible to operate the spool 40 more stably.

When the spool 40 moves toward the forward position, the cutout 48 continuously provided in the outer circumferential groove 47 of the spool 40 passes through the pressure chamber Cp. As a result, the pressure chamber Cp and the third chamber C3 communicate with each other through the notch 48. As described above, the third chamber C3 always communicates with the control flow path 96. That is, when the spool 40 moves toward the forward position, the pressure chamber Cp and the control flow path 96 communicate with each other through the third chamber C3. When the pressure chamber Cp and the control flow path 96 communicate with each other, the oil in the pressure chamber Cp flows to the control flow path 96, so that the pressure in the pressure chamber Cp rapidly decreases. Therefore, in this embodiment, the outer circumferential groove 47 and the cutout 48 receive the driving force of the drive unit 84 (solenoid) of the drive device 80, and the spool main body 46 moves from the other side to one side. At this time, a pressure chamber communication flow path capable of controlling the flow rate of oil from the pressure chamber Cp toward the control flow path 96 to be controlled is configured. On the other hand, the throttle portion 68 of the poppet 60 limits the flow rate per unit time of oil flowing from the pressure source flow path 95 toward the pressure chamber Cp.

When the pressure in the pressure chamber Cp and the force pressing the poppet 60 on one side due to the pressing force of the poppet compression spring 14 is smaller than the force pressing the poppet 60 on the other side due to the pressure in the pressure source path 95, The poppet 60 moves to the other side along the axial direction da, so that the seat surface 63 of the poppet 60 is spaced apart from the seat portion 25 of the casing 20. Thereby, the pressure source port 22 of the casing 20 and the inner circumferential groove 24 communicate through the cutout 69 of the poppet 60. That is, through the pressure source port 22, the cutout 69, the inner peripheral groove 24, the control port 23, and the first inner peripheral groove 93 of the member to be installed 90, the pressure source flow path 95 And the control flow path 96 communicates. As a result, the flow control valve 10 enters the flow state shown in FIG. 3, and oil flows from the pressure source flow path 95 toward the control flow path 96.

At this time, since the pressure chamber Cp and the control flow path 96 are in communication, 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 increases. . When the pressure of Cp in the pressure chamber and the force pressing the poppet 60 on one side due to the pressing force of the poppet compression spring 14 exceeds the force pressing the poppet 60 on the other side due to the pressure of the pressure source flow path 95 , The poppet 60 moves to one side, and the opening area between the pressure source flow path 95 and the control flow path 96 through the cutout 69 of the poppet 60 decreases. Thereby, the cutout 69 of the poppet 60 functions as a throttle, and the flow rate of the oil flowing from the pressure source flow path 95 toward the control flow path 96 decreases, and the inside of the control flow path 96 and the pressure chamber Cp The pressure inside decreases. Accordingly, the poppet 60 moves to the other side, and the opening area between the pressure source flow path 95 and the control flow path 96 by the cutout 69 of the poppet 60 increases. And, the pressure of Cp in the pressure chamber and the force of pressing the poppet 60 to one side by the pressing force of the poppet compression spring 14 and the force of pressing the poppet 60 to the other side by the pressure of the pressure source flow path 95 The poppet 60 stops at the hit place, and the flow rate corresponding to the opening area between the pressure source flow path 95 and the control flow path 96 by the cutout 69 at this time is controlled from the pressure source flow path 95 Oil flows toward the flow path 96. The stop position of the poppet 60 can be controlled by controlling the amount of protrusion to one side of the drive rod 82 along the axial direction da by the drive unit 84 of the drive device 80. That is, by controlling the amount of protrusion of the drive rod 82 to one side along the axis direction da, it is possible to control the flow rate of the oil flowing from the pressure source flow path 95 toward the control flow path 96.

Next, an operation for moving the flow control valve 10 from the flow state to the closed state will be described. When the drive rod 82 of the driving device 80 is retracted to the other side, the spool 40 is retracted toward the retracted position by the pressing force of the spool pressing spring 12, and the spool 40 causes Cp in the pressure chamber and The space between the 3rd room C3 is closed. Thereafter, oil flows into the pressure chamber Cp from the pressure source flow path 95 through the throttle portion 68 of the poppet 60, thereby increasing the pressure in the pressure chamber Cp. When the pressure in the pressure chamber Cp and the force pressing the poppet 60 on one side by the poppet compression spring 14 exceeds the force pressing the poppet 60 on the other side by the pressure in the pressure source flow path 95, the poppet ( 60) moves to one side and is pressed against the seat portion 25 of the casing 20. Thereby, the flow control valve 10 returns to the closed state shown in FIG.

The flow control valve 10 of the present invention includes a spool receiving block 30 having a spool receiving hole 31, a spool main body 46, and a spool large-diameter part having a diameter larger than that of the spool main body 46. (50) And, with the opening on one end side of the axial direction da, the spool main body 46 is located between the portion of the spool body 46 on the other end side of the axial direction da and the spool receiving block 30 It has a flow path 51 through which the thread C1 is passed, and includes a spool 40 that is movably accommodated in the spool accommodation hole 31.

In addition, the flow control valve 10 of the present invention includes a spool receiving block 30 having a spool receiving hole 31, and a spool body portion 46 having one end surface 41 positioned at one end of the axial direction da. , Has a diameter larger than the diameter of the spool main body 46, is located at one end and an intermediate portion spaced from the other end in the axial direction da, and has an acting surface 50a facing the other end and another acting surface 50b facing the one end. It has a spool large-diameter portion 50 that has the same area of one end face 41 and an area of the action surface 50a, and is open to one end, and is larger than the spool large-diameter portion 50 of the spool main body 46. The portion that is to be the end side and the flow path 51 through the thread C1 positioned between the spool receiving block 30 and the portion that is open to the other end side, and becomes one end side of the spool large-diameter portion 50 of the spool body portion 46, and A spool 40 is provided that has another flow path 55 that communicates with the other yarn C2 positioned between the spool accommodation blocks 30 and is movable in the spool accommodation hole 31 by the driving force of the solenoid.

In addition, the flow control valve 10 according to the present invention is a spool unit having a diameter larger than that of the spool main body 46 and the spool main unit 46 disposed to be movable to one side and the other side along the axial direction da. A spool 40 having a neck portion 50 and a pressure chamber Cp that is at least partially partitioned at an end of one side of the spool body portion 46 to generate a pressing force that presses the spool body portion 46 from one side to the other side, and , At least a part of the spool main body 46 is partitioned at a portion on the other end side of the spool large-diameter portion 50, pressing the spool large-diameter portion 50 from the other side toward one side, and at least part of the pressing force by the pressure chamber Cp. When the spool main body 46 moves from the other side to one side by receiving the driving force of the seal C1 and the solenoid (driving unit 84) to generate another pressing force to be removed, the flow rate is controlled from the pressure chamber Cp. It is provided with a pressure chamber communication flow path (47, 48) capable of controlling the flow rate of the oil toward the ).

According to such a flow control valve 10, a pressure equal to the pressure acting on one end of the spool 40 acts on the portion of the spool 40 facing the thread C1, and the spool 40 is axially directed. Compression force toward one side of da is generated. Accordingly, the pressing force toward one side generated on the portion of the spool 40 facing the thread C1 removes (is canceled) at least a part of the pressing force toward the other side generated at one end of the spool 40. Thereby, it is possible to effectively reduce the pressing force that presses the spool 40 toward the other side, which is generated by the pressure acting on one end of the spool 40, and it becomes possible to reduce the driving force required for the driving device 80. . Therefore, the drive device 80 can be downsized and the cost of the drive device 80 can be reduced.

In the flow control valve 10 of the present invention, the spool main body 46 has one end face 41 positioned at one end, and the spool large diameter section 50 has an action face 50a facing the other end. , The area of the one end surface 41 and the area of the action surface 50a are the same.

According to this flow control valve 10, the pressing force toward the other side through the one end surface 41 and the pressing force toward one side through the action surface 50a cancel each other. Therefore, only the pressing force of the spool pressing spring 12 becomes a pressing force for pressing the spool 40 toward the other side. That is, the drive device 80 can move the spool 40 toward the forward position only by pressing the spool 40 against the pressing force of the spool pressing spring 12. In this case, it becomes possible to further reduce the driving force required for the drive device 80. Therefore, the drive device 80 can be further downsized, and the cost of the drive device 80 can be further reduced.

In the flow control valve 10 of the present invention, the spool large-diameter portion 50 is located at an intermediate portion spaced from one end and the other end of the spool 40.

According to such a flow control valve 10, since the area of the end surface 41 and the area of the action surface 50a can be independently adjusted from each other, the degree of design freedom of the spool 40 can be improved. Accordingly, it is also possible to easily make the area of the one end surface 41 and the area of the action surface 50a the same.

In the flow control valve 10 of the present invention, the spool large-diameter portion 50 has another action surface 50b facing one end, and the spool 40 is opened to the other end side of the spool 40, A portion of the spool main body 46 at one end of the spool large-diameter portion 50 and another flow path 55 connected to another thread C2 positioned between the spool receiving block 30 is provided.

According to such a flow control valve 10, a pressure equal to the positive or negative pressure acting on the other end of the spool 40 acts on the portion of the spool 40 facing the other seal C2, and the spool 40 ) To the other side or one side of the axis direction da is generated. Therefore, the pressing force toward the other side or one side generated through the other working surface 50b with respect to the spool 40 removes at least a part of the pressing force toward one side or the other side through the other end of the spool 40 (to cancel it). ). Thereby, the pressing force acting on the spool 40 generated by the pressure in the rod chamber Cr can be effectively reduced, and the spool 40 can be stably operated.

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

A solenoid actuator capable of outputting a large driving force is generally large and expensive. In contrast, according to the flow control valve 10 of the present invention, since the driving force required to move the spool 40 can be reduced, the spool 40 moves inside the spool receiving hole 31 with the driving force of the solenoid. Even in such a case, as the driving source of the spool 40, a solenoid actuator having a relatively small driving force and a small size and low cost can be used.

10: flow control valve
12: spool compression spring
14: poppet compression spring
16: gap
20: casing
21: receiving hole
22: pressure source port
23: control port
25: seat portion
30: spool receiving block
30a: first block
30b: second block
31: spool receiving hole
40: spool
41: once
44: other section
46: spool body part
47: outer circumferential groove (pressure chamber communication flow path)
48: notch (pressure chamber communication flow path)
50: spool large neck
50a: first working surface (acting surface)
50b: second action surface (other action surface)
51: 1st contact euro (Euro)
55: 2nd contact euro (other euros)
60: poppet
61: main body
63: sheet surface
68: throttle
69: notch
70: ball
71: support member
80: drive device
82: driving rod
84: drive unit
90: member to be installed
91: main body
92: flow control valve installation hole
95: pressure source flow path
96: control euro
97: drain flow path
A: center axis
C1: first room (room)
C2: 2nd room (other room)
C3: 3rd room
Cp: pressure chamber
Cr: load seal

Claims (7)

A spool receiving block having a spool receiving hole,
The spool body portion, the spool large-diameter portion having a diameter larger than the diameter of the spool body portion, and a portion that is open to one end side in the axial direction and becomes the other end side in the axial direction than the spool large-diameter portion of the spool body portion, and the spool A spool that has a flow path through a thread at least partially partitioned in the accommodation block, and is movably accommodated in the spool accommodation hole.
Equipped with a flow control valve. The method of claim 1, wherein the spool body portion has one end surface positioned at the one end,
The spool large diameter portion has an action surface facing the other end side,
The flow control valve, wherein the area of the one end surface and the area of the action surface are the same. The flow control valve according to claim 1, wherein the large diameter portion of the spool is located at an intermediate portion spaced apart from the one end and the other end of the spool. The method of claim 1, wherein the spool large-diameter portion has another action surface facing the one end side,
The spool is opened to the other end side of the spool, and has another flow path through which a portion of the spool body portion becomes the one end side than the spool large-diameter portion and another seal positioned between the spool accommodation block. The flow control valve according to claim 1, wherein the spool moves within the spool receiving hole by a driving force of a solenoid. A spool receiving block having a spool receiving hole,
A spool body portion having one end surface positioned at one end in the axial direction, a spool body portion having a diameter larger than the diameter of the spool body portion and positioned at an intermediate portion spaced from the one end and the other end in the axial direction, and an action surface facing the other end side, and the A spool large-diameter portion having another working surface facing one end, and having the same area of the one end surface and the working surface area, and the other end side of the spool body portion than the spool large-diameter portion And a flow path through which the thread is partitioned at least in part in the spool receiving block, and a portion which is at the one end side of the spool body part and at least a part of the spool receiving block while opening at the other end side. A spool that has a different flow path through which the different yarns are partitioned, and is movable within the spool receiving hole by the driving force of a solenoid
Equipped with, flow control valve. A spool having a spool body portion disposed to be movable to one side and the other side along the axial direction, and a spool large-diameter portion having a diameter larger than the diameter of the spool body portion;
A pressure chamber that is at least partially partitioned from an end portion of the spool body portion to generate a pressing force for pressing the spool body portion from the one side toward the other side;
At least a part of the spool body portion is partitioned at a portion that is on the other end side than the spool large diameter portion, and the spool large diameter portion is pressed from the other side toward the one side, thereby generating another pressing force that removes at least a part of the pressing force by the pressure chamber. The fruit to let,
A flow control valve having a pressure chamber communication flow passage capable of controlling a flow rate of oil from the pressure chamber toward a control flow passage to which the flow rate is to be controlled when the spool body portion moves from the other side to the one side by receiving the driving force of the solenoid.

Images