Valve, fluid control valve, fluid system, and construction machine

Abstract

The present application provides a valve, a fluid control valve, a fluid system, and a construction machine. The valve of the present application includes a first valve core having a central hole and a first conical surface centered on an axis of the central hole; a second valve core having a second conical surface centered on the axis of the central hole, the second valve core being inserted into the central hole and moving along the axis of the central hole; a first elastic member elastically pressing the first valve core in one direction of the axis of the central hole; and a second elastic member elastically pressing the second valve core in one direction of the axis of the central hole.

Description

TECHNICAL FIELD

[0001] The present application relates to a valve, a fluid control valve, a fluid system, and a construction machine. BACKGROUND

[0002] Conventionally, as a construction machine, there is known a hydraulic excavator. The hydraulic excavator is provided with a boom, a stick, and a bucket, and the like, which are operated by hydraulic cylinders. The hydraulic excavator is provided with a hydraulic system that drives the accessories. The hydraulic system is provided with a hydraulic control valve that controls the supply and discharge of hydraulic oil to the hydraulic cylinders. As the hydraulic control valve, there is a hydraulic control valve that is provided with a valve body having a plurality of passages and a valve core for preventing backflow of hydraulic oil that has been supplied to the valve body (for example, refer to Patent Literature 1). In Patent Literature 1, for example, in order to improve the maintainability of the valve body, a plurality of valve cores are arranged on the connection surface of the valve body.

[0003] Prior art documents

[0004] Patent documents

[0005] Patent Literature 1: Japanese Patent Application Publication No. 2017-141858 SUMMARY

[0006] Problems to be solved by the invention

[0007] However, in a case where a plurality of valve cores are arranged on the same surface (the connection surface of the valve body), it is necessary to ensure that the connection area of the valve body is wide. Therefore, there is room for improvement in terms of miniaturization of the valve body.

[0008] The present application has been made in order to solve the above-described problems, and has an object to provide a valve, a fluid control valve, a fluid system, and a construction machine that can miniaturize a valve body.

[0009] Solution to the problem

[0010] As a solution to the above-described problems, the present application has a configuration as follows.

[0011] (1) The valve of the present application has a first valve core having a central hole and a first conical surface having the axis of the central hole as a center line, a second valve core having a second conical surface having the axis of the central hole as a center line, the second valve core being inserted into the central hole and moving along the axis of the central hole, a first elastic member elastically pressing the first valve core in one direction of the axis of the central hole, and a second elastic member elastically pressing the second valve core in one direction of the axis of the central hole.

[0012] According to this structure, the first valve core and the second valve core are arranged on the same axis, and thus, compared to a case where a plurality of valve cores are arranged on the same surface, respectively, the valve can be downsized. That is, it is not necessary to secure a wide connection area of the valve body. Thus, the valve body can be downsized. Further, the first valve core and the second valve core are supported, respectively, and thus, the first valve core and the second valve core can be managed with high precision, respectively. Further, compared to a case where a concave-convex surface for allowing fluid to pass therethrough is provided, it is not necessary to perform complicated processing, and thus, cost reduction can be achieved.

[0013] (2) In the valve according to (1) above, the fluid can pass between the inner peripheral surface of the central hole of the first valve core and the outer peripheral surface of the second valve core.

[0014] (3) In the valve according to (2) above, the outer peripheral surface of the second valve core can have a notch.

[0015] (4) In the valve according to any one of (1) to (3) above, the first valve core can have a cylindrical body having an outer shape smaller than that of the first conical surface.

[0016] (5) In the valve according to any one of (1) to (4) above, the central hole can have a first inlet portion and a second inlet portion located in line with the first inlet portion in the axis direction, the second inlet portion being larger than the first inlet portion, and the second valve core can have a flange having an outer shape with a diameter larger than that of the second valve core and substantially the same as that of the first inlet portion.

[0017] (6) The valve according to the aspect of the present application includes: a first valve core having a central hole and a first conical surface having the axis of the central hole as a center line; a second valve core having a second conical surface having the axis of the central hole as a center line, the second valve core being inserted into the central hole and moving along the axis of the central hole to allow fluid to pass between the second valve core and an inner peripheral surface of the central hole; a first elastic member elastically pressing the first valve core in one direction of the axis of the central hole; and a second elastic member elastically pressing the second valve core in one direction of the axis of the central hole.

[0018] According to this structure, the first valve core and the second valve core are arranged on the same axis, and thus, compared to a case where a plurality of valve cores are arranged on the same surface, respectively, the valve can be downsized. That is, it is not necessary to secure a wide connection area of the valve body. Thus, the valve body can be downsized. Further, the first valve core and the second valve core are supported, respectively, and thus, the first valve core and the second valve core can be managed with high precision, respectively. Further, compared to a case where a concave-convex surface for allowing fluid to pass therethrough is provided, it is not necessary to perform complicated processing, and thus, cost reduction can be achieved.

[0019] (7) The fluid control valve according to the aspect of the present application includes the valve and the valve body according to any one of (1) to (6).

[0020] (8) In the fluid control valve according to (7), the valve body can have a first passage, a second passage, and a supply passage, the first valve core can block or connect the first passage and the supply passage, and the second valve core can block or connect the second passage and the supply passage.

[0021] (9) In the fluid control valve according to (8), the valve can be disposed at a position opposite to the first passage and the second passage with the supply passage interposed therebetween in the axial direction.

[0022] (10) In the fluid control valve according to (9), the first valve core can move in a direction away from the supply passage when fluid is supplied from the first passage to the supply passage, and the second valve core can move toward the inside of the supply passage when fluid is supplied from the second passage to the supply passage.

[0023] (11) The fluid system according to the aspect of the present application includes the fluid control valve according to any one of (7) to (10), a fluid supply source that communicates with a plurality of passages and supplies fluid, and a drive body that is driven by the fluid.

[0024] (12) The construction machine according to the aspect of the present application includes the fluid system according to (11).

[0025] Effects of the invention

[0026] According to the present application, it is possible to provide a valve, a fluid control valve, a fluid system, and a construction machine that can reduce the size of a valve body. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic view of a construction machine according to a first embodiment.

[0028] Figure 2 is a top view of a fluid control valve according to the first embodiment.

[0029] Figure 3 is a schematic view of a fluid system including a III-III cross section of Figure 2

[0030] Figure 4 is a schematic view of a valve including a main part enlarged view of Figure 3

[0031] Figure 5 is a V-V cross-sectional view of Figure 4 ​​​

[0032] Figure 6 is a schematic view of a first spool of the first embodiment.

[0033] Figure 7 is a schematic view of a second spool of the first embodiment.

[0034] Figure 8 is an explanatory view of one example of the operation of the valve of the first embodiment.

[0035] Figure 9 is an explanatory view of another example of the operation of the valve of the first embodiment.

[0036] Figure 10 is a schematic view of a second spool of a modification of the first embodiment.

[0037] Figure 11 is a schematic view of a valve of the second embodiment.

[0038] Figure 12 is a plan view of a fluid control valve of the third embodiment.

[0039] Figure 13 is a XIII-XIII sectional view of Figure 12

[0040] Explanation of reference numerals

[0041] 1, construction machine; 10, fluid system; 11, fluid control valve; 12, hydraulic pump (fluid supply source); 13, hydraulic actuator (driving body); 20, valve; 20A, first valve (valve); 20B, second valve (valve); 21, first spool; 22, second spool; 24, first elastic member; 25, second elastic member; 30, valve body; 35, first passage; 36, second passage; 37, supply passage; 50, central hole; 50a, first inlet portion; 50b, second inlet portion; 51, valve main body; 52, first conical surface; 53, cylindrical body; 60, shaft body; 60a, notch; 61, second conical surface; 62, flange; 162, flange; 221, first spool; 255, first region; 256, second region; 257, partition; 311, fluid control valve; 330, valve body; 335, first passage; 336, second passage; 337, supply passage; C1, axis. DETAILED DESCRIPTION

[0042] Embodiments of the present application will be described below with reference to the drawings. In the following embodiments, as a construction machine, a hydraulic excavator provided with a hydraulic system (fluid system) is exemplified and described. In the drawings used in the following description, the scale of each component is appropriately changed so as to set each component to a size that can be recognized.​

[0043] [First Embodiment]

[0044] [Construction Machine]

[0045] Figure 1 is a schematic view of a construction machine 1 of the first embodiment.

[0046] The construction machine 1 is, for example, a hydraulic shovel. The construction machine 1 is provided with a swing body 2 and a traveling body 3. The swing body 2 is provided on the traveling body 3 in a swingable manner. The swing body 2 is provided with a hydraulic pump 12 (fluid supply source) that supplies working oil (fluid).

[0047] The swing body 2 is provided with: a cab 5 in which an operator can ride; a boom 6 whose one end is linked to the cab 5 in a swingable manner; a stick 7 whose one end is linked to the other end (top end) on the side opposite to the cab 5 of the boom 6 in a swingable manner; and a bucket 8 that is linked to the other end (top end) on the side opposite to the boom 6 of the stick 7 in a swingable manner. The hydraulic pump 12 is disposed in the cab 5. The cab 5, the boom 6, the stick 7, and the bucket 8 are driven by working oil supplied from the hydraulic pump 12.

[0048] [Fluid System]

[0049] Figure 2 is a plan view of the fluid control valve 11 of the first embodiment. Figure 3 is a schematic view of the fluid system 10 including Figure 2 a III-III cross section.

[0050] As shown in Figure 3 , the fluid system 10 is provided with the fluid control valve 11, the hydraulic pump 12, and a hydraulic actuator 13 (driving body) that is driven by working oil. The hydraulic actuator 13 is, for example, a hydraulic motor, a hydraulic cylinder, or the like. In Figure 3 , a hydraulic cylinder is shown as the hydraulic actuator 13. Reference numeral 14 in the drawing denotes a tank that stores working oil.

[0051] [Fluid Control Valve]

[0052] The fluid control valve 11 controls the supply and discharge of working oil with respect to the hydraulic cylinder 13. The fluid control valve 11 is provided with a plurality of (for example, two in the present embodiment) valves 20, a valve body 30 having a plurality of passages 31 to 37, and a valve stem 40. The fluid control valve 11 is a slide valve type directional control valve.

[0053] Multiple passages 31 to 37 are flow paths (oil passages) for supplying working oil. Multiple passages 31 to 37 include valve pillar hole 31, first actuator passage 32, second actuator passage 33, box passage 34, first passage 35, second passage 36 and supply passage 37.

[0054] The valve stem hole 31 is a hole into which the valve stem 40 can be inserted. The valve stem hole 31 is located in a direction substantially orthogonal to the axis C1 of the valve 20. Figure 3 The valve stem 40 extends through the valve body 30 in the left-right direction and the opening direction of the valve stem bore 31. The valve stem 40 is inserted into the valve stem bore 31 in a detachable manner. The valve stem 40 extends along the opening direction of the valve stem bore 31. The valve stem 40 has multiple shoulders 41 that can contact the inner circumferential surface of the valve stem bore 31. The valve stem 40 moves along the opening direction of the valve stem bore 31, thereby opening and closing the flow path and performing throttling actions. The flow rate of the working oil supplied to the hydraulic cylinder is controlled by the position of the valve stem 40.

[0055] In the figure, reference numeral 42 indicates a helical spring for holding the valve stem 40 in a predetermined position (e.g., a return spring for returning the valve stem 40 to a neutral position), reference numeral 43 indicates a first pilot port disposed on one end of the valve stem 40, and reference numeral 44 indicates a second pilot port disposed on the other end of the valve stem 40.

[0056] The first actuator passage 32 is disposed on one side of the valve 20. The first actuator passage 32 is in a direction substantially parallel to the axis C1. Figure 3 It extends in the vertical direction and in a direction orthogonal to the opening direction of the valve stem hole 31. One end of the first actuator passage 32 ( Figure 3 The upper end) is connected to the first port (e.g., the rod-side oil chamber) of the hydraulic cylinder 13. The other end of the first actuator passage 32 ( Figure 3 The lower end of the valve stem is connected to the valve stem hole 31.

[0057] The second actuator passage 33 is located on the other side of the valve 20. That is, the second actuator passage 33 is located on the opposite side of the first actuator passage 32, across the valve 20. The second actuator passage 33 is located in a direction substantially parallel to the first actuator passage 32. Figure 3 (extending in the vertical direction). One end of the second actuator passage 33 ( Figure 3 The upper end of the second actuator passage 33 is connected to the second port (e.g., the cylinder head side oil chamber) of the hydraulic cylinder 13. Figure 3 The lower end of the valve stem is connected to the valve stem hole 31.

[0058] The housing passage 34 branches off from the valve stem hole 31. The housing passage 34 includes: a first housing path 34a, which is located to the side of the first actuator passage 32 and in a direction substantially parallel to the first actuator passage 32. Figure 3The second box path 34b extends in the vertical direction; it is located to the side of the second actuator passage 33 and in a direction substantially parallel to the first box path 34a. Figure 3 The path extends in the vertical direction; and the third box path 34c extends in a direction substantially parallel to the opening direction of the valve stem hole 31, connecting one end of the first box path 34a. Figure 3 (the lower end) and one end of the path 34b of the second box ( Figure 3 (Lower end). The third box path 34c is located on the opposite side of valve 20, separated by valve post hole 31.

[0059] The first passage 35 is positioned overlapping with valve 20. The first passage 35 is located on the opposite side of the third passage 34c, separated by valve stem bore 31. The first passage 35 is a parallel passage for connecting multiple flow paths in parallel. That is, working oil is supplied in parallel (simultaneously) to multiple sections (not shown) through the first passage 35.

[0060] The second passage 36 is positioned closer to the valve stem hole 31 than the first passage 35. The second passage 36 is located between the first passage 35 and the valve stem hole 31. The second passage 36 is a series flow path used to connect multiple flow paths in series. That is, the working oil passing through the second passage 36 is supplied sequentially (from the upstream side to the downstream side of the working flow direction) to multiple branches (not shown).

[0061] Supply passage 37 is disposed between first passage 35 and second passage 36. Supply passage 37 has an inverted U-shape in cross-section. The middle portion of supply passage 37 connects to first passage 35 and second passage 36. Both ends of supply passage 37 connect to valve post holes 31. Supply passage 37 is a bridge-type flow path used to bridge first passage 35 and second passage 36.

[0062] [valve]

[0063] Valve 20 is in the opening direction of valve stem 40 ( Figure 3 A pair of valves 20 are arranged in a left-right direction. The pair of valves 20 are arranged in adjacent positions with the wall portion 30a of the valve body 30 as a barrier. The pair of valves 20 consists of a first valve 20A located near the first actuator passage 32 and a second valve 20B located near the second actuator passage 33.

[0064] In the figure, reference numeral 18 indicates a plug covering the end of valve 20, and reference numeral 19 indicates an O-ring seal disposed in the groove of plug 18. Hereinafter, the first valve 20A of the pair of valves 20 will be described. The second valve 20B has the same structure as the first valve 20A, therefore, detailed description is omitted. Hereinafter, the first valve 20A will also be simply referred to as "valve 20".

[0065] likeFigure 4 As shown, valve 20 includes a first valve core 21, a second valve core 22, a fluid passage 23, and elastic members 24 and 25. The first valve core 21 and the second valve core 22 share a common axis C1. That is, the first valve core 21 and the second valve core 22 are coaxially arranged. Hereinafter, the direction parallel to axis C1 will be referred to as the "axial direction," and the direction orthogonal to the axial direction will be referred to as the "radial direction." Valve 20 is positioned in the axial direction opposite to the first passage 35 and the second passage 36, separated by the supply passage 37.

[0066] [Valve Core 1]

[0067] The first valve core 21 blocks or connects the first passage 35 and the supply passage 37. Figure 4 In this configuration, the first valve core 21 blocks the first passage 35 and the supply passage 37. The first valve core 21 has a central hole 50 and a first conical surface 52 centered on the axis C1 of the central hole 50. The first valve core 21 includes a valve body 51 with the central hole 50. The first conical surface 52 is located on the outer periphery of the valve body 51. The valve body 51 has a cylindrical body 53 offset from the first conical surface 52 in the axial direction.

[0068] The central bore 50 is open along the axial direction on the entire valve body 51. The central bore 50 has: a first inlet 50a for the shaft 60 of the second valve core 22 to enter; a second inlet 50b, which is positioned in the axial direction in a row with the first inlet 50a and is larger than the first inlet 50a; and a third inlet 50c, which is positioned in the axial direction in a row with the second inlet 50b and is larger than the second inlet 50b. The shaft 60 of the second valve core 22 enters in the order of the first inlet 50a, the second inlet 50b, and the third inlet 50c. The third inlet 50c also functions as a spring receiving portion for the elastic members 24 and 25 (coil springs).

[0069] The first conical surface 52 is disposed on the outer periphery of the second inlet portion 50b in the valve body 51. The first conical surface 52 is provided on the entire outer periphery of the valve body 51. The first conical surface 52 has an annular shape when viewed from the axial direction. The first conical surface 52 has an inclined surface that gradually decreases in size radially inward as it moves from the first passage 35 side toward the supply passage 37 side.

[0070] The cylinder 53 has a first inlet portion 50a of the valve body 51. The cylinder 53 is positioned closer to the supply passage 37 than the first conical surface 52. The cylinder 53 is a cylindrical shape with a smaller outer diameter than the first conical surface 52. The cylinder 53 has an outer diameter smaller than the minimum outer diameter of the first conical surface 52 (the outer diameter of the end near the supply passage 37).

[0071] [Second Valve Core]

[0072] The second valve core 22 blocks or connects the second passage 36 and the supply passage 37. Figure 4 In this configuration, the second valve core 22 blocks the second passage 36 and the supply passage 37. The second valve core 22 has a second conical surface 61 centered on the axis C of the central hole 50. The second valve core 22 is inserted into the central hole 50 and moves along the axis C of the central hole 50. The second valve core 22 includes a shaft 60 that moves along the axis C of the central hole 50. The shaft 60 has a flange 62 with a diameter larger than the diameter of the shaft 60.

[0073] The second conical surface 61 is disposed on the outer periphery of the end of the shaft 60 near the second passage 36 side. The second conical surface 61 is disposed on the entire outer periphery of the shaft 60. The second conical surface 61 has an annular shape when viewed from the axial direction. The second conical surface 61 has an inclined surface that gradually increases radially outward from the second passage 36 side toward the supply passage 37 side.

[0074] A flange 62 is disposed at the end of the shaft 60 on the side opposite to the second conical surface 61. The flange 62 is disposed on the entire outer circumference of the shaft 60. The flange 62 has an annular shape when viewed from the axial direction. The flange 62 has a substantially similar shape to the first inlet portion 50a when viewed from the axial direction. "Substantially similar" means that, within the allowable range of design error (dimensional error) of the valve 20, the shape of the flange 62 is substantially the same as that of the first inlet portion 50a. "Substantially similar" includes the case where the shape of the flange 62 is exactly the same as that of the first inlet portion 50a.

[0075] In the embodiment, the outer diameter D1 of the flange 62 (refer to...) Figure 7 ) and the inner diameter D2 of the first inlet 50a (refer to Figure 6 The outer diameter D1 of flange 62 is approximately the same (D1≈D2). The outer diameter D1 of flange 62 refers to the outer diameter of the end of flange 62 on the side of the second conical surface 61. The inner diameter D2 of the first inlet 50a refers to the inner diameter of the portion of the first inlet 50a adjacent to the second inlet 50b.

[0076] [Fluid pathway]

[0077] like Figure 5 As shown, the fluid passage 23 is disposed between the inner circumference of the central hole 50 and the outer circumference of the shaft 60. The fluid passage 23 is a flow path that allows working oil to pass through in the axial direction. The shaft 60 has a notch 60a formed by cutting off a portion of the outer circumference of the shaft 60. The fluid passage 23 is formed by dividing the notch 60a (D-cut surface) of the shaft 60 and the inner circumference of the central hole 50 (the portion opposite to the notch 60a).

[0078] [Elastic Component]

[0079] like Figure 4As shown, elastic members 24 and 25 are disposed on valve 20. In this embodiment, there are two elastic members, but there can also be three or more. For example, elastic members 24 and 25 are helical springs. The plurality of elastic members 24 and 25 are a first elastic member 24 that elastically supports the first valve core 21 and a second elastic member 25 that elastically supports the second valve core 22. The first elastic member 24 and the second elastic member 25 are disposed in the third inlet portion 50c. The first elastic member 24 and the second elastic member 25 are capable of elastic deformation along the axial direction. The first elastic member 24 and the second elastic member 25 are disposed in a position where they are pressed only from one side along the axial direction.

[0080] The first elastic member 24 is disposed between the valve body 51 of the first valve core 21 and the plug 18. The first elastic member 24 always presses the first valve core 21 toward the supply passage 37 so that the first valve core 21 blocks the first passage 35 and the supply passage 37. Hereinafter, the force by which the first elastic member 24 presses the first valve core 21 toward the supply passage 37 is also referred to as the "first spring force".

[0081] The second elastic member 25 is disposed between the flange 62 of the second valve core 22 and the plug 18. The second elastic member 25 has a smaller profile than the first elastic member 24 when viewed from the axial direction. The second elastic member 25 is positioned radially inward than the first elastic member 24. The second elastic member 25 always presses the second valve core 22 toward the second passage 36, thereby blocking the second passage 36 and the supply passage 37. Hereinafter, the force by which the second elastic member 25 presses the second valve core 22 toward the second passage 36 is also referred to as the "second spring force".

[0082] [Valve Action]

[0083] Figure 8 This is an explanatory diagram illustrating an example of the operation of valve 20 in the first embodiment. Figure 8 This indicates the situation when working oil is supplied from the second passage 36 to the supply passage 37. Figure 8 In the diagram, a solid line indicates the state in which the second valve core 22 connects the second passage 36 and the supply passage 37, while a double-dotted line indicates the state in which the second valve core 22 blocks the second passage 36 and the supply passage 37.

[0084] like Figure 8 As shown, when working oil is supplied from the second passage 36 to the supply passage 37, the second valve core 22 is moved in the axial direction from the side of the second conical surface 61 ( Figure 8 (Push from the lower side). At this time, if the second valve core 22 is pushed more forcefully than the second spring force from the side opposite to the first valve core 21 in the axial direction, the second valve core 22 overcomes the second elastic member 25 and moves towards Figure 8The upper side is shifted. That is, when working oil is supplied from the second passage 36 to the supply passage 37, the second valve core 22 moves into the interior of the supply passage 37. As a result, the working oil flows from the second passage 36 toward the supply passage 37. Figure 8 (The direction of arrow K1).

[0085] Figure 9 This is an explanatory diagram illustrating another example of the operation of valve 20 in the first embodiment. Figure 9 This indicates the situation when working oil is supplied from the first passage 35 to the supply passage 37. Figure 9 In the diagram, a solid line indicates the state in which the first valve core 21 connects the first passage 35 and the supply passage 37, while a double-dotted line indicates the state in which the first valve core 21 blocks the first passage 35 and the supply passage 37.

[0086] like Figure 9 As shown, when working oil is supplied from the first passage 35 to the supply passage 37, the first valve core 21 is moved in the axial direction from the side of the first conical surface 52 ( Figure 9 (Push down on the lower side). At this time, a portion of the working oil flowing in the supply passage 37 passes through the fluid passage 23 (refer to...). Figure 5 ), acting on the back side of the first valve core 21 (the upper end of the valve body 51) ( Figure 9 (in the direction of arrow K2), at a predetermined pressure (hereinafter also referred to as "bridge pressure"), the first valve core 21 is directed towards... Figure 9 If the first valve core 21 is pushed downwards from the side of the first conical surface 52 in the axial direction with a force greater than the bridge pressure, then the first valve core 21 overcomes the first elastic member 24 and moves towards... Figure 9 The upper side is shifted. That is, when working oil is supplied from the first passage 35 to the supply passage 37, the first valve core 21 moves away from the supply passage 37. As a result, the working oil flows from the first passage 35 toward the supply passage 37. Figure 9 (Arrow K3 direction).

[0087] As described above, the valve 20 of this embodiment includes: a first valve core 21 having a central hole 50 and a first conical surface 52 centered on the axis C1 of the central hole 50; a second valve core 22 having a second conical surface 61 centered on the axis C1 of the central hole 50, the second valve core 22 being inserted into the central hole 50 and moving along the axis C1 of the central hole 50, so that working oil passes between the second valve core 22 and the inner circumferential surface of the central hole 50; a first elastic member 24 that elastically presses the first valve core 21 toward the axis C1 of the central hole 50; and a second elastic member 25 that elastically presses the second valve core 22 toward the axis C1 of the central hole 50.

[0088] According to this structure, the first valve core 21 and the second valve core 22 are arranged on the same axis. Therefore, compared with the case where multiple valve cores are arranged on the same surface, the valve 20 can be miniaturized. That is, it is not necessary to ensure a wide connection area of ​​the valve body 30. Thus, the valve body 30 can be miniaturized. In addition, since the first valve core 21 and the second valve core 22 are supported respectively, the first valve core 21 and the second valve core 22 can be managed with high precision. Furthermore, compared with the case where there are uneven surfaces for allowing working oil to pass through, complex machining is not required, and cost reduction can be achieved. Specifically, the first conical surface 52 and the cylinder 53 are arranged at a position offset in the axial direction. Therefore, compared with the case where the first conical surface 52 also serves as the cylinder 53 (for example, the case where uneven surfaces are provided on the first conical surface 52 to allow working oil to pass through), complex machining is not required, and cost reduction can be achieved.

[0089] In this embodiment, the outer peripheral surface of the second valve core 22 has a notch 60a.

[0090] According to this structure, the working oil can pass through the notch 60a, thus simplifying the process compared to cases with complex flow paths.

[0091] In this embodiment, the first valve core 21 has a cylindrical body 53 with a smaller outer shape than the first conical surface 52.

[0092] Based on this structure, it can be configured to allow the working oil to pass smoothly along the outer periphery of the cylinder 53.

[0093] In this embodiment, the central hole 50 has a first inlet portion 50a and a second inlet portion 50b, which is located in the axial direction in a row with the first inlet portion 50a and is larger than the first inlet portion 50a. The second valve core 22 has a flange 62 with a diameter larger than the diameter of the second valve core 22 and a shape that is substantially the same as the first inlet portion 50a.

[0094] According to this structure, when the flange 62 is positioned in the second inlet 50b via the first inlet 50a, the flange 62 remains within the second inlet 50b as long as its shape does not match the first inlet 50a. That is, the flange 62 is easy to insert into the second inlet 50b and difficult to remove from it. Therefore, the first valve core 21 and the second valve core 22 are held in a difficult-to-remove state. Consequently, the assembly and disassembly of the valve 20 relative to the valve body 30 become easier, improving maintainability.

[0095] The fluid control valve 11 of this embodiment includes the valve 20 and valve body 30 described above.

[0096] Based on this structure, a fluid control valve 11 that enables miniaturization of the valve body 30 can be provided.

[0097] In this embodiment, the valve body 30 includes a first passage 35, a second passage 36, and a supply passage 37. The first valve core 21 blocks or connects the first passage 35 and the supply passage 37. The second valve core 22 blocks or connects the second passage 36 and the supply passage 37.

[0098] According to this structure, the valve body 30, which includes the first passage 35, the second passage 36 and the supply passage 37, can be miniaturized.

[0099] In this embodiment, valve 20 is positioned opposite to first passage 35 and second passage 36 in the axial direction, separated by supply passage 37.

[0100] According to this structure, the first passage 35 and the second passage 36 are arranged opposite each other across the supply passage 37 and interact with it, which can further suppress the enlargement of the valve body 30.

[0101] In this embodiment, when working oil is supplied from the first passage 35 to the supply passage 37, the first valve core 21 moves away from the supply passage 37. When working oil is supplied from the second passage 36 to the supply passage 37, the second valve core 22 moves into the supply passage 37.

[0102] According to this structure, the first passage 35 and the second passage 36 are arranged opposite each other across the supply passage 37, where the first valve core 21 and the second valve core 22 can be smoothly operated.

[0103] The fluid system 10 of this embodiment includes: the fluid control valve 11 described above; a fluid supply source 12, which is connected to a plurality of passages 31 to 37 and supplies working oil; and a drive body 13, which is driven by the working oil.

[0104] Based on this structure, a fluid system 10 can be provided that enables miniaturization of the valve body 30.

[0105] The construction machinery 1 of this embodiment includes the fluid system 10 described above.

[0106] Based on this structure, a construction machine 1 that enables the miniaturization of the valve body 30 can be provided.

[0107] The scope of protection of this invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of this invention.

[0108] For example, in the above embodiments, the example of construction machinery 1 being a hydraulic excavator has been described, but the invention is not limited thereto. For example, the invention can also be applied to construction machinery other than hydraulic excavators.

[0109] In the above embodiments, examples of flange 62 extending in the same axial direction have been given for illustration, but the description is not limited thereto. For example, such as Figure 10 As shown, flange 162 can also have a conical shape. Flange 162 has an inclined surface that gradually decreases radially inward as it moves toward the side opposite to the second conical surface 61. Figure 10 In this document, structures identical to those in the above embodiments are labeled with the same reference numerals, and their detailed descriptions are omitted.

[0110] According to this structure, compared to the case where the flange extends in the same axial direction, it is easier to position the flange 162 via the first inlet 50a to the second inlet 50b. Therefore, the first valve core 21 and the second valve core 22 can be easily installed while making them difficult to remove. Consequently, the assembly and disassembly of the valve 20 relative to the valve body 30 become easier, further improving maintainability.

[0111] [Second Implementation]

[0112] Figure 11 This is a schematic diagram of the valve in the second embodiment.

[0113] In the above embodiments, the example of the central hole 50 opening along the entire valve body 51 in the axial direction has been described, but the embodiments are not limited thereto. For example, such as Figure 11 As shown, the first valve core 221 may also include a separator 257 that divides the central hole 50 into a first region 255 on one side of the axial direction and a second region 256 on the other side of the axial direction. The shaft 60 is disposed in the second region 256. Figure 11 In this document, structures identical to those in the above embodiments are labeled with the same reference numerals, and their detailed descriptions are omitted.

[0114] A separator 257 is disposed between the second inlet 50b and the third inlet 50c. The separator 257 is annular when viewed from the axial direction. The first region 255 is located on the side opposite to the second valve core 22, separated from the separator 257 in the axial direction. Figure 11 The second region 256 is located on the opposite side of the first region 255, separated by the separator 257 in the axial direction. Figure 11 (the lower side).

[0115] The first elastic member 24 and the second elastic member 25 are arranged at different positions in the axial direction. The first elastic member 24 is arranged between the separator 257 of the first valve core 221 and the plug 18. The second elastic member 25 is arranged between the flange 62 of the second valve core 22 and the separator 257 of the first valve core 221.

[0116] In this embodiment, the first valve core 221 includes a separator 257 that divides the central hole 50 into a first region 255 on one side of the axial direction and a second region 256 on the other side of the axial direction. The shaft 60 is disposed in the second region 256.

[0117] According to this structure, the movement of the shaft 60 relative to the central hole 50 in the axial direction can be restricted by the separator 257.

[0118] [Third Implementation]

[0119] Figure 12 This is a top view of the fluid control valve 311 according to the third embodiment. Figure 13 yes Figure 12 Sectional view XIII-XIII.

[0120] In the above embodiments, examples of fluid control valve 11 comprising multiple valves 20, valve body 30 having multiple passages 31-37, and valve stem 40 have been described, but the embodiments are not limited thereto. For example, such as Figure 13 As shown, the fluid control valve 311 may also have a single valve 20 and a valve body 330 with multiple passages 335-337. The fluid control valve 311 in this embodiment does not have a valve stem 40. Figure 12 , Figure 13 In this document, structures identical to those in the above embodiments are labeled with the same reference numerals, and their detailed descriptions are omitted.

[0121] Multiple pathways 335–337 include pathway 1 335, pathway 2 336, and supply pathway 337.

[0122] The first passage 335 is located on one side of the valve 20. Figure 13 (To the right). The first passage 335 is in a direction substantially orthogonal to the axis C1 of valve 20 ( Figure 13 (Extends in the left and right directions).

[0123] The second passage 336 is disposed on one side of the valve 20. The second passage 336 extends in a direction substantially parallel to the first passage 335. The second passage 336 is disposed on the side opposite to the first passage 335 in the axial direction. Figure 13 (the lower side).

[0124] Supply passage 337 is located on the other side of valve 20. Figure 13 (To the left). Supply passage 337 extends in a direction substantially parallel to the first passage 335.

[0125] Valve 20 is positioned in the axial direction opposite to the first passage 335 and the second passage 336, separated by the supply passage 337.

[0126] The first valve core 21 blocks or connects the first passage 335 and the supply passage 337. In Figure 13 In this configuration, the first valve core 21 blocks the first passage 335 and the supply passage 337. When working oil is supplied from the first passage 335 to the supply passage 337, the first valve core 21 moves away from the supply passage 337.

[0127] The second valve core 22 blocks or connects the second passage 336 and the supply passage 337. Figure 13 In the middle, the second valve core 22 blocks the second passage 336 and the supply passage 337. When working oil is supplied from the second passage 336 to the supply passage 337, the second valve core 22 moves into the supply passage 337.

[0128] In this embodiment, only one valve 20 is provided. The valve body 330 does not have a valve stem hole.

[0129] According to this structure, compared with the case where multiple valves are provided and the valve body has valve column holes, the number of parts can be reduced and the valve body 330 can be simplified, thus achieving cost reduction.

[0130] Furthermore, without departing from the spirit of the invention, the constituent elements in the above embodiments can be replaced with well-known constituent elements. Additionally, the various modifications described above can also be combined.

Claims

1. A valve, wherein the valve has: a first valve core having a central hole and a first conical surface with the axis of the central hole as a center line; a second valve core having a second conical surface with the axis of the central hole as a center line, the second valve core being inserted into the central hole and moving along the axis of the central hole; a first elastic member elastically pressing the first valve core in one direction of the axis of the central hole; and a second elastic member elastically pressing the second valve core in one direction of the axis of the central hole, the central hole has: a first inlet portion for an axis body of the second valve core to enter; a second inlet portion located in line with the first inlet portion in the axis direction, the second inlet portion being larger than the first inlet portion; and a third inlet portion located in line with the second inlet portion in the axis direction, the third inlet portion being larger than the second inlet portion, the first valve core has a partition dividing the central hole into a first region on one side in the axis direction and a second region on the other side in the axis direction, the partition is disposed between the second inlet portion and the third inlet portion, the axis body of the second valve core is disposed in the second region, the second valve core has a flange having an outer shape larger than a diameter of the second valve core and substantially the same as the first inlet portion.

2. The valve according to claim 1, wherein fluid can pass between an inner peripheral surface of the central hole of the first valve core and an outer peripheral surface of the second valve core.

3. The valve according to claim 2, wherein the outer peripheral surface of the second valve core has a notch.

4. The valve according to claim 1, wherein the first valve core has a cylinder having an outer shape smaller than an outer shape of the first conical surface.

5. A fluid control valve, wherein the fluid control valve has the valve according to any one of claims 1 to 4 and a valve body.

6. The fluid control valve according to claim 5, wherein the valve body has a first passage, a second passage, and a supply passage, the first valve core blocks or connects the first passage and the supply passage, the second valve core blocks or connects the second passage and the supply passage.

7. The fluid control valve according to claim 6, wherein the valve is disposed in a position where the first passage and the second passage face each other with the supply passage interposed therebetween in the axis direction.

8. The fluid control valve according to claim 7, wherein when fluid is supplied from the first passage to the supply passage, the first valve core moves in a direction away from the supply passage, when the fluid is supplied from the second passage to the supply passage, the second valve core moves to the inside of the supply passage.

9. A fluid system, wherein the fluid system has: the fluid control valve according to any one of claims 5 to 8; a fluid supply source communicating with a plurality of passages and supplying fluid; and a drive body driven by the fluid.

10. A construction machine, wherein the construction machine has the fluid system according to claim 9.

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