Hydraulic valve device

Abstract

In order to efficiently regenerate oil while suppressing an increase in size, a valve main body (30a) is provided with a first valve element (41A) for controlling the supply of oil to a cylinder bottom chamber (12) of an arm cylinder (10), and a second valve element (41B) for controlling the supply of oil to a rod chamber (11), and the valve main body (30a) is provided with a first valve element (41A) for controlling the supply of oil to the cylinder bottom chamber (12) of the arm cylinder (10), and a second valve element (41B) for controlling the supply of oil to the rod chamber (11). An axial bottom oil passage section (43A2) of the bottom oil passage (43A) is provided parallel to the axial center direction of the second arm body hole (32) and side by side with the second arm body hole (32), a regeneration port (32d) is provided in the second arm body hole (32), and an axial bottom oil passage section (43A2) for the bottom oil passage (43A) is provided between the regeneration port (32d) and the axial bottom oil passage section (43A2). A regenerated oil passage (46A) allowing oil to flow from the regeneration port (32d) to the bottom oil passage (43A) is provided, and when the first oil inlet orifice (31b) is connected to the first pump oil supply port (31a), the regeneration port (32d) is connected to the second oil return orifice (32c).

Description

Technical Field

[0001] The present invention relates to a hydraulic valve device having a regeneration circuit for supplying oil discharged from an oil chamber on one side of a hydraulic cylinder to an oil chamber on the other side. Background Technology

[0002] Some hydraulic valve devices used for controlling the oil supply to hydraulic cylinders have a regeneration circuit. Such hydraulic valve devices have many advantages, such as being able to supply (regenerate) not only oil supplied from the hydraulic pump to the rod chamber when the piston rod of the hydraulic cylinder retracts, but also oil discharged from the cylinder bottom chamber to the rod chamber, enabling the piston rod to retract quickly, improving fuel efficiency, etc. (see, for example, Patent Document 1).

[0003] Patent Document 1: Japanese Patent Application Publication No. 8-100803 Summary of the Invention

[0004] Furthermore, in the aforementioned hydraulic valve device, a first oil inlet throttle port and a first oil return throttle port are provided at one end of the valve core, and a first oil passage is provided radially from the first oil inlet throttle port along the valve core, and the first oil passage is connected to the bottom chamber of the hydraulic cylinder. A second oil inlet throttle port and a second oil return throttle port are provided at the other end of the valve core, and a second oil passage is provided radially from the second oil inlet throttle port along the valve core, and the second oil passage is connected to the rod chamber of the hydraulic cylinder.

[0005] The regeneration circuit described above is constructed by providing a regeneration port at one end of the valve core and a regeneration oil passage connecting the regeneration port to the second oil inlet throttle port. That is, the regeneration oil passage is arranged parallel to the valve core, along the axial direction of the valve core, from one end to the other.

[0006] To ensure efficient oil supply via the regeneration circuit, it is preferable to have a large cross-sectional area and a short path length for the regeneration oil passage. However, the aforementioned regeneration circuit needs to be located from one end of the valve core to the other, making it difficult to shorten the path length. Furthermore, if a large cross-sectional area is ensured, the overall dimensions of the valve body need to be increased, potentially leading to a larger device size.

[0007] The present invention was made in view of the above circumstances, and its object is to provide a hydraulic valve device that can not only suppress large-scale operation but also efficiently regenerate oil.

[0008] To achieve the above objectives, the hydraulic valve device of the present invention comprises, in the valve body, a first valve core for controlling the oil supply to the first oil chamber of the hydraulic cylinder, and a second valve core for controlling the oil supply to the second oil chamber of the hydraulic cylinder. In the first valve core hole for receiving the first valve core, there are a first pump oil supply port connected to the hydraulic pump, a first oil inlet throttle port and a first oil return throttle port connected to the first oil chamber via a first oil passage, and a first oil tank opening connected to the oil tank. In the second valve core hole for receiving the second valve core, there is a second pump oil supply port connected to the hydraulic pump. The first oil passage includes a second oil inlet throttle port and a second oil return throttle port connected to the second oil chamber via a second oil passage, and a second oil tank port connected to the oil tank. The first oil passage has a first oil passage portion, which is parallel to the axial direction of the second valve core hole and is arranged side by side with the second valve core hole. A regeneration port is provided in the second valve core hole, and a regeneration oil passage is provided between the regeneration port and the first oil passage portion to allow oil to flow from the regeneration port to the first oil passage portion. When oil is discharged from the second oil chamber, the regeneration port is connected to the second oil return throttle port.

[0009] According to the present invention, the first oil passage portion of the first oil passage is parallel to the axial direction of the second valve core hole and is arranged side by side with the second valve core hole. Therefore, the path length of the regeneration oil passage connecting the regeneration port provided in the second valve core hole and the first oil passage portion can be shortened. Thus, even when ensuring that the regeneration oil passage has a large cross-sectional area, the increase in the external dimensions of the valve body can be suppressed, and it is also ideal from the viewpoint of valve body strength. Attached Figure Description

[0010] Figure 1 This is a diagram showing the hydraulic drive circuit of a hydraulic valve device that applies an embodiment of the present invention.

[0011] Figure 2 It is possessed by Figure 1 A side view of a machine tool with a hydraulically driven cylinder controlled by a hydraulic drive circuit.

[0012] Figure 3 This is a schematic representation of what is applied to. Figure 1 A perspective view of the main components of the hydraulic valve device in the hydraulic drive circuit.

[0013] Figure 4 It is a schematic representation from another perspective. Figure 3 A perspective view of the main parts of the hydraulic valve assembly shown.

[0014] Figure 5 It is a schematic representation from another perspective. Figure 3 A perspective view of the main parts of the hydraulic valve assembly shown.

[0015] Figure 6 It is a schematic representation from the front side. Figure 3 A diagram showing the main parts of the hydraulic valve assembly.

[0016] Figure 7 The application observed from the front side Figure 1 A diagram showing the appearance of the hydraulic valve device in the hydraulic drive circuit.

[0017] Figure 8 yes Figure 7 The YY line section view.

[0018] Figure 9 yes Figure 7 ZZ line sectional view.

[0019] Figure 10 yes Figure 8 The XX-line sectional view in the diagram. Detailed Implementation

[0020] Hereinafter, preferred embodiments of the hydraulic valve device of the present invention will be described in detail with reference to the accompanying drawings.

[0021] Figure 1 This diagram illustrates the hydraulic drive circuit of a hydraulic valve device according to an embodiment of the present invention. The hydraulic drive circuit illustrated here is used to drive two hydraulic cylinders 10 and 20 by means of oil supplied from two hydraulic pumps 1A and 1B.

[0022] Hydraulic pumps 1A and 1B are variable-capacity hydraulic pumps that change the discharge volume by altering the tilt angle of the swashplate or swashplate. In the hydraulic drive circuit of this embodiment, two hydraulic pumps 1A and 1B with identical configurations and sizes are used. Hereinafter, when differentiation between the two is necessary, they will be described as follows: Figure 1 The hydraulic pump on the left is called the first hydraulic pump 1A, which will be set in... Figure 1 The hydraulic pump on the right is called the second hydraulic pump 1B.

[0023] Hydraulic cylinders 10 and 20 are components that cause the piston rod to reciprocate relative to the cylinder body by selectively supplying oil to their respective rod chambers and cylinder bottom chambers. In this embodiment, as... Figure 2As shown, the boom hydraulic cylinder 10 and the arm hydraulic cylinder 20, both installed in a working machine, are used as the hydraulic supply control objects. That is, the working machine has a boom BM and a boom AM. The boom BM is rotatably supported on the upper rotating body JS via a boom shaft S1 in the horizontal direction, through its base end. The boom AM is rotatably supported on the front end of the boom BM via a boom shaft S2 arranged parallel to the boom shaft S1, through its base end. The boom hydraulic cylinder 10 is clamped between the boom BM and the boom AM, and the arm hydraulic cylinder 20 is clamped between the upper rotating body JS and the boom BM. Both the boom hydraulic cylinder 10 and the arm hydraulic cylinder 20 are single-rod double-acting hydraulic cylinders with a single piston rod.

[0024] like Figure 1 As shown, in the hydraulic drive circuit, a hydraulic valve device 30 is provided between the hydraulic pumps 1A and 1B and the hydraulic cylinders 10 and 20. The hydraulic valve device 30 includes: a stick directional switching valve 2A, which selectively connects the first hydraulic pump 1A to the rod chamber (second oil chamber) 11 or the cylinder bottom chamber (first oil chamber) 12 of the stick hydraulic cylinder 10; and a boom directional switching valve 2B, which selectively connects the second hydraulic pump 1B to the rod chamber (first oil chamber) 21 or the cylinder bottom chamber (second oil chamber) 22 of the boom hydraulic cylinder 20. In the valve body 30a of this hydraulic valve device 30, two oil supply passages 3A and 3B, a tank oil passage 4, and four valve cores 41A, 41B, 42A, and 42B are provided.

[0025] The valve body 30a is formed as a single block, for example, such as Figures 3-6 As schematically shown, it is roughly rectangular in shape. Two oil supply passages 3A and 3B are straight spaces formed inside the valve body 30a, each with the same inner diameter, and are arranged parallel to each other on their axes. The two oil supply passages 3A and 3B are respectively connected to the aforementioned independent hydraulic pumps 1A and 1B, enabling oil supply. For convenience, the two oil supply passages 3A and 3B are arranged along the vertical direction of the valve body 30a, and biased towards the back side of the valve body 30a. When it is necessary to distinguish between the two oil supply passages 3A and 3B, the oil supply passage connected to the first hydraulic pump 1A will be referred to as the first oil supply passage 3A, and the oil supply passage connected to the second hydraulic pump 1B will be referred to as the second oil supply passage 3B. The tank oil passage 4 is a straight space formed inside the valve body 30a, arranged along the vertical direction of the valve body 30a, biased towards the front side, but is not explicitly shown in the figure. Figure 1 As shown, oil passage 4 is connected to oil tank T.

[0026] like Figures 3-6 As shown, four valve cores 41A, 41B, 42A, and 42B are disposed on the valve body 30a, and are arranged in pairs to control the oil supply to one hydraulic cylinder 10 and 20 respectively. Figure 8 , Figure 9 As shown, valve cores 41A, 41B, 42A, and 42B are formed into cylindrical shapes with multiple shore portions divided by annular grooves. The valve cores 41A, 41B, 42A, and 42B are arranged parallel to each other with their respective axes orthogonal to the axes of the oil supply passages 3A and 3B, and are disposed in independent valve core holes 31, 32, 33, and 34 provided in the valve body 30a in a state that allows them to move along their respective axes.

[0027] In this embodiment, such as Figure 1 , Figure 5 , Figure 7 As shown, the two valve cores (hereinafter referred to as boom valve cores 41A and 41B, when necessary to distinguish them) constituting the boom directional switching valve 2A are arranged side by side vertically in the axial direction of the first oil supply passage 3A, and the two valve cores (hereinafter referred to as boom valve cores 42A and 42B, when necessary to distinguish them) constituting the boom directional switching valve 2B are arranged side by side vertically in the axial direction of the second oil supply passage 3B. The two boom valve cores 41A and 41B and the two boom valve cores 42A and 42B are arranged side by side in the left-right direction. Hereinafter, viewed from the front side, the boom valve core located in the upper left corner is referred to as the first boom valve core (first valve core) 41A, and the boom valve core located in the lower left corner is referred to as the second boom valve core (second valve core) 41B. Similarly, viewed from the front side, the boom valve spool located on the upper right is referred to as the first boom valve spool (first valve spool) 42A, and the boom valve spool located on the lower right is referred to as the second boom valve spool (second valve spool) 42B.

[0028] In the first boom valve core hole (first valve core hole) 31 used to receive the valve core 41A for the first boom, from the location located Figure 8 Starting from the lower end side, a first oil supply port 31a, a first oil inlet throttle port 31b, a first oil return throttle port 31c, and a first oil tank port 31d are sequentially provided. When the valve core 41A of the first boom moves axially, the connection state of the first oil supply port 31a and the first oil tank port 31d relative to the first oil inlet throttle port 31b and the first oil return throttle port 31c is switched.

[0029] More specifically, when the first boom valve 41A is in the neutral position, both the first inlet throttle port 31b and the first return throttle port 31c are disconnected from the first pump oil supply port 31a and the first oil tank port 31d. If the first boom valve 41A moves from the neutral position to... Figure 8 The lower side ( Figure 1If the first boom moves to the left (left side), then the first oil inlet throttle port 31b is connected to the first pump oil supply port 31a, while the first oil return throttle port 31c remains disconnected from the first oil tank port 31d. If the first boom uses valve core 41A to move from the neutral position to the left... Figure 8 The upper side ( Figure 1 If the first oil inlet throttle port 31b moves to the right, then the first oil return throttle port 31c and the first oil tank port 31d become connected.

[0030] The first oil inlet throttle port 31b and the first oil return throttle port 31c are respectively connected to the bottom chamber 12 of the boom hydraulic cylinder 10 through the bottom oil passage (first oil passage) 43A. A load check valve 43Aa, which only allows oil to flow into the bottom chamber 12, is installed in the bottom oil passage 43A from the first oil inlet throttle port 31b to the boom chamber 11. Figures 3-6 ,and Figure 8 As shown, the cylinder bottom oil passage 43A includes: a radial cylinder bottom oil passage portion 43A1, which extends radially from the first oil inlet throttle port 31b and the first oil return throttle port 31c along the first boom valve core hole 31; and an axial cylinder bottom oil passage portion (first oil passage portion) 43A2, which extends from the end of the radial cylinder bottom oil passage portion 43A1 to the front of the valve body 30a in a direction parallel to the axis of the first boom valve core hole 31. The axial cylinder bottom oil passage portion 43A2 is located above the second boom valve core hole (second valve core hole) 32 for receiving the second boom valve core 41B, and is arranged side by side with the first boom valve core hole 31 in the left-right direction. The first pump oil supply port 31a is connected to the first oil supply passage 3A via a branch oil supply passage 44, and the first oil tank port 31d is connected to the tank oil passage 4 via a drain passage 45.

[0031] In the second boom valve core hole 32, from the location located Figure 9 Starting from the lower end side, a second pump oil supply port 32a, a second oil inlet throttle port 32b, a second oil return throttle port 32c, a regeneration port 32d, and a second oil tank port 32e are sequentially provided. When the valve core 41B of the second boom moves axially, the connection state of the second pump oil supply port 32a and the second oil tank port 32e relative to the second oil inlet throttle port 32b and the second oil return throttle port 32c is switched.

[0032] More specifically, when the second boom valve 41B is in the neutral position, both the second inlet throttle port 32b and the second return throttle port 32c are disconnected from the second pump oil supply port 32a, the regeneration port 32d, and the second oil tank port 32e. If the second boom valve 41B moves from the neutral position to... Figure 9 The lower side ( Figure 1If the second boom moves to the left, then the second return oil throttle port 32c is connected to the regeneration port 32d and the second oil tank port 32e, while the second inlet oil throttle port 32b remains disconnected from the second pump oil supply port 32a. If the second boom uses valve core 41B to move from the neutral position to the left... Figure 9 The upper side ( Figure 1 If the right side of the second oil return throttle port 32c moves, the second oil return throttle port 32c and the regeneration port 32d remain disconnected, while the second oil inlet throttle port 32b and the second pump oil supply port 32a become connected.

[0033] The second oil inlet throttle port 32b and the second oil return throttle port 32c are respectively connected to the rod chamber 11 of the boom hydraulic cylinder 10 through the rod oil passage (second oil passage) 43B. A load check valve 43Ba, which only allows oil to flow into the rod chamber 11, is installed in the rod oil passage 43B from the second oil inlet throttle port 32b to the rod chamber 11. Figures 3-6 ,and Figure 10 As shown, the rod oil passage 43B includes: a radial rod oil passage 43B1, which extends radially from the second inlet throttle port 32b and the second return throttle port 32c along the second rod valve core hole 32; and an axial rod oil passage (second oil passage) 43B2, which extends from the end of the radial rod oil passage 43B1 to the front of the valve body 30a in a direction parallel to the axis of the second rod valve core hole 32. The axial rod oil passage 43B2 is located below the axial cylinder bottom oil passage 43A2 and is arranged side by side with the second rod valve core hole 32 in the left-right direction. The second pump oil supply port 32a is connected to the first oil supply passage 3A via a branch oil supply passage 44, and the second oil tank port 32e is connected to the tank oil passage 4 via a drain passage 45.

[0034] like Figures 3-6 , Figure 10 As shown, the regeneration port 32d of the second boom valve core hole 32 is connected to the axial cylinder bottom oil passage portion 43A2 of the cylinder bottom oil passage 43A through the regeneration oil passage 46A provided in the valve body 30a. The regeneration oil passage 46A is provided in an inclined manner from the regeneration port 32d towards the axial cylinder bottom oil passage portion 43A2, and is connected to the cylinder bottom oil passage 43A in a portion downstream of the load check valve 43Aa. In the regeneration oil passage 46A, a regeneration check valve 46Aa is provided that only allows oil to flow from the regeneration port 32d to the cylinder bottom oil passage 43A.

[0035] In the first boom valve core hole (first valve core hole) 33 used to receive the first boom valve core 42A, from the location located Figure 8Starting from the lower end side, a first oil supply port 33a, a first oil inlet throttle port 33b, a first oil return throttle port 33c, and a first oil tank port 33d are sequentially provided. When the first boom valve core 42A moves axially, the connection state of the first oil supply port 33a and the first oil tank port 33d relative to the first oil inlet throttle port 33b and the first oil return throttle port 33c is switched.

[0036] More specifically, when the first boom valve spool 42A is positioned in the neutral position, both the first inlet throttle port 33b and the first return throttle port 33c are disconnected from the first pump oil supply port 33a and the first oil tank port 33d. If the first boom valve spool 42A moves from the neutral position to... Figure 8 The lower side ( Figure 1 If the first boom valve core 42A moves from the neutral position to the right side, then the first inlet throttle port 33b is connected to the first pump oil supply port 33a, while the first return throttle port 33c remains disconnected from the first oil tank port 33d. Figure 8 The upper side ( Figure 1 If the first oil inlet throttle port 33b moves to the left, then the first oil return throttle port 33c and the first oil tank port 33d remain disconnected, while the first oil return throttle port 33c and the first oil tank port 33d become connected.

[0037] The first oil inlet throttle port 33b and the first oil return throttle port 33c are respectively connected to the rod chamber 21 of the boom hydraulic cylinder 20 through the rod oil passage (first oil passage) 47B. A load check valve 47Ba, which only allows oil to flow into the rod chamber 21, is installed in the rod oil passage 47B from the first oil inlet throttle port 33b to the rod chamber 21. Figures 3-6 ,and Figure 8 As shown, the boom oil passage 47B includes: a radial boom oil passage portion 47B1, which extends radially from the first inlet throttle port 33b and the first return throttle port 33c along the first boom valve core hole 33; and an axial boom oil passage portion (first oil passage portion) 47B2, which extends from the end of the radial boom oil passage portion 47B1 to the front of the valve body 30a in a direction parallel to the axis of the first boom valve core hole 33. The axial boom oil passage portion 47B2 is located above the second boom valve core hole (second valve core hole) 34 for receiving the second boom valve core 42B, and is arranged side by side with the first boom valve core hole 33 in the left-right direction. The first pump oil supply port 33a is connected to the second oil supply passage 3B via a branch oil supply passage 48, and the first oil tank port 33d is connected to the tank oil passage 4 via a drain passage 49.

[0038] In the second boom valve core hole 34, from the location located Figure 9Starting from the lower end side, a second oil supply port 34a, a second oil inlet throttle port 34b, a second oil return throttle port 34c, a regeneration port 34d, and a second oil tank port 34e are sequentially provided. When the valve core 42B of the second boom moves axially, the connection state of the second oil supply port 34a and the second oil tank port 34e relative to the second oil inlet throttle port 34b and the second oil return throttle port 34c is switched.

[0039] More specifically, when the second boom valve 42B is positioned in the neutral position, both the second inlet throttle port 34b and the second return throttle port 34c are disconnected from the second pump oil supply port 34a, the regeneration port 34d, and the second oil tank port 34e. If the second boom valve 42B moves from the neutral position to... Figure 9 The lower side ( Figure 1 If the second boom valve core 42B moves from the neutral position to the right side, then the second return oil throttle port 34c is connected to the regeneration port 34d and the second oil tank port 34e, while the second inlet oil throttle port 34b remains disconnected from the second pump oil supply port 34a. Figure 9 The upper side ( Figure 1 If the left side moves, the second return oil throttle port 34c and the regeneration port 34d remain disconnected, while the second inlet oil throttle port 34b and the second pump oil supply port 34a become connected.

[0040] The second oil inlet throttle port 34b and the second oil return throttle port 34c are respectively connected to the cylinder bottom chamber 22 of the boom hydraulic cylinder 20 through the cylinder bottom oil passage (second oil passage) 47A. A load check valve 47Aa, which only allows oil to flow into the cylinder bottom chamber 22, is installed in the cylinder bottom oil passage 47A from the second oil inlet throttle port 34b to the cylinder bottom chamber 22. Figures 3-6 ,and Figure 9 As shown, the cylinder bottom oil passage 47A includes: a radial cylinder bottom oil passage portion 47A1, which is provided radially from the second oil inlet throttle port 34b and the second oil return throttle port 34c along the second boom valve core hole 34; and an axial cylinder bottom oil passage portion (second oil passage portion) 47A2, which is provided from the end of the radial cylinder bottom oil passage portion 47A1 to the front of the valve body 30a in a direction parallel to the axis of the second boom valve core hole 34. The axial cylinder bottom oil passage portion 47A2 is located below the axial rod oil passage portion 47B2 and is arranged side by side with the second boom valve core hole 34 in the left-right direction. The second pump oil supply port 34a is connected to the second oil supply passage 3B via a branch oil supply passage 48, and the second oil tank port 34e is connected to the tank oil passage 4 via a drain passage 49.

[0041] like Figures 3-6 ,and Figure 10As shown, the regeneration port 34d of the second boom valve core hole 34 is connected to the axial rod oil passage portion 47B2 of the rod oil passage 47B via a regeneration oil passage 46B provided in the valve body 30a. The regeneration oil passage 46B is provided in an inclined manner from the regeneration port 34d towards the axial rod oil passage portion 47B2, and is connected to the rod oil passage 47B in a portion downstream of the load check valve 47Aa. In the regeneration oil passage 46B, a regeneration check valve 46Ba is provided that only allows oil to flow from the regeneration port 34d to the rod oil passage 47B.

[0042] Depend on Figure 8 , Figure 9 As can be seen, each of the four valve cores 41A, 41B, 42A, and 42B is equipped with a neutral spring 80, and each has a pressure chamber 81 at both ends. The neutral spring 80 is used to maintain each valve core 41A, 41B, 42A, and 42B in a neutral position. The pressure chamber 81 is used to house the ends of the valve cores 41A, 41B, 42A, and 42B, and is filled with oil. Each pressure chamber 81 is connected to a pilot oil passage for the pilot pressure output from the operating valve to function, although this is not explicitly shown in the figure. When the pilot pressure output with the operation of the operating valve is applied to the pressure chamber 81 through the pilot oil passage, it can press the valve cores 41A, 41B, 42A, and 42B axially, causing the valve cores 41A, 41B, 42A, and 42B to move against the elastic force of the neutral spring 80. If the pilot pressure applied to the pressure chamber 81 is removed, each valve core 41A, 41B, 42A, and 42B will return to the neutral position by the force of the neutral spring 80. In this embodiment, an operating valve for the boom is provided so that the two boom valve cores 41A and 41B are linked in the same direction. Similarly, the boom operating valve is configured such that when the boom operating valve is operated, the two boom valve cores 42A and 42B are linked in the same direction.

[0043] In a hydraulic drive circuit constructed as described above, such as Figure 1 As shown, with the boom valve cores 41A and 41B in the neutral position, the first inlet throttle port 31b, the first return throttle port 31c, the second inlet throttle port 32b, and the second return throttle port 32c are all disconnected. Therefore, oil does not flow to the boom chamber 11 and the cylinder bottom chamber 12 of the boom hydraulic cylinder 10, and the piston rod 14 remains in its current position relative to the cylinder body 13.

[0044] If from this state onwards, the boom is moved by valve cores 41A and 41B via the operation of the valve. Figure 1When the piston rod moves to the right, the oil supplied from the first hydraulic pump 1A to the first oil supply passage 3A is supplied to the rod chamber 11 of the boom hydraulic cylinder 10 through the branch oil supply passage 44, the second pump oil supply port 32a of the second boom valve core 41B, the second oil inlet throttle port 32b, and the rod oil passage 43B. Simultaneously, the oil in the cylinder bottom chamber 12 is discharged to the oil tank T through the cylinder bottom oil passage 43A, the first return oil throttle port 31c of the first boom valve core 41A, the first oil tank port 31d, and the drain passage 45. Therefore, in the working machinery, the piston rod 14 retracts relative to the cylinder body 13 of the boom hydraulic cylinder 10, thereby enabling the tilting action of the boom AM.

[0045] Conversely, if the boom is moved by valve cores 41A and 41B through the operation of the control valve, Figure 1 When the piston rod moves to the left, the oil supplied from the first hydraulic pump 1A to the first oil supply passage 3A is supplied to the bottom chamber 12 of the boom hydraulic cylinder 10 through the branch oil supply passage 44, the first pump oil supply port 31a of the first boom valve core 41A, the first oil inlet throttle port 31b, and the cylinder bottom oil passage 43A. Simultaneously, the oil in the rod chamber 11 is discharged to the oil tank T through the rod oil passage 43B, the second return oil throttle port 32c of the second boom valve core 41B, the second oil tank port 32e, and the drain passage 45. Therefore, in the working machine, the piston rod 14 extends relative to the cylinder body 13 of the boom hydraulic cylinder 10, thereby enabling the digging action of the boom AM.

[0046] Similarly, with the boom valve cores 42A and 42B in the neutral position, the first inlet throttle port 33b, the first return throttle port 33c, the second inlet throttle port 34b, and the second return throttle port 34c are all disconnected. Therefore, oil does not flow to the rod chamber 21 and the cylinder bottom chamber 22 of the boom hydraulic cylinder 20, and the piston rod 24 remains in its current position relative to the cylinder body 23.

[0047] If from this state onwards, the boom is moved by valve cores 42A and 42B via the operation of the valve. Figure 1 When the boom moves to the left, the oil supplied from the second hydraulic pump 1B to the second oil supply passage 3B is supplied to the bottom chamber 22 of the boom hydraulic cylinder 20 through the branch oil supply passage 48, the second pump oil supply port 34a of the second boom valve 42B, the second oil inlet throttle port 34b, and the cylinder bottom oil passage 47A. Simultaneously, the oil in the rod chamber 21 is discharged to the oil tank T through the rod oil passage 47B, the first return oil throttle port 33c of the first boom valve 42A, the first oil tank port 33d, and the drain passage 49. Therefore, in the working machinery, the piston rod 24 extends relative to the cylinder body 23 of the boom hydraulic cylinder 20, thereby enabling the boom BM to rise.

[0048] Conversely, if the boom is moved by valve cores 42A and 42B through the operation of the control valve, Figure 1 When the piston rod moves to the right, the oil supplied from the second hydraulic pump 1B to the second oil supply passage 3B is supplied to the rod chamber 21 of the boom hydraulic cylinder 20 through the branch oil supply passage 48, the first pump oil supply port 33a of the first boom valve 42A, the first oil inlet throttle port 33b, and the rod oil passage 47B. Simultaneously, the oil in the cylinder bottom chamber 22 is discharged to the oil tank T through the cylinder bottom oil passage 47A, the second return oil throttle port 34c of the second boom valve 42B, the second oil tank port 34e, and the drain passage 49. Therefore, in the operating machinery, the piston rod 24 retracts relative to the cylinder body 23 of the boom hydraulic cylinder 20, thereby enabling the lowering action of the boom BM.

[0049] Here, in the aforementioned hydraulic valve device 30, if the boom is directed by valve cores 41A and 41B... Figure 1 When the piston rod moves to the left, the regeneration port 32d is connected to the second return oil throttle port 32c. Therefore, oil discharged from the rod chamber 11 flows through the rod oil passage 43B, the second return oil throttle port 32c, the regeneration port 32d, the regeneration oil passage 46A, and the regeneration check valve 46Aa. This oil, along with oil from the first hydraulic pump 1A, is supplied to the cylinder bottom chamber 12. This allows the piston rod 14 to extend without creating negative pressure in the cylinder bottom chamber 12, enabling rapid digging of the stick AM. Furthermore, when the pressure in the cylinder bottom chamber 12 is higher than the pressure in the rod chamber 11, the regeneration check valve 46Aa remains closed, and oil from the rod chamber 11 is discharged to the oil tank T.

[0050] Similarly, if the boom uses valve cores 42A and 42B to... Figure 1 When the piston moves to the right, the regeneration port 34d is connected to the second return oil throttle port 34c. Therefore, oil discharged from the cylinder bottom chamber 22 flows through the cylinder bottom oil passage 47A, the second return oil throttle port 34c, the regeneration port 34d, the regeneration oil passage 46B, and the regeneration check valve 46Ba. This oil, along with oil from the second hydraulic pump 1B, is supplied to the rod chamber 21. This allows the piston rod 24 to retract without creating negative pressure in the rod chamber 21, enabling rapid lowering of the boom BM. Furthermore, when the pressure in the cylinder bottom chamber 22 is higher than the pressure in the rod chamber 21, the regeneration check valve 46Ba remains closed, and oil from the rod chamber 21 is discharged to the oil tank T.

[0051] Furthermore, as described above, in the boom directional control valve 2A, by making the second boom valve core hole 32, which is arranged side by side, linearly connected to the cylinder bottom oil passage 43A (axial cylinder bottom oil passage 43A2), the regeneration oil passage 46A can be configured with the shortest path length. In the boom directional control valve 2B, by making the second boom valve core hole 34, which is arranged side by side, linearly connected to the boom oil passage 47B (axial boom oil passage 47B2), the regeneration oil passage 46B can be configured with the shortest path length. As a result, even if the regeneration oil passages 46A and 46B each have a large cross-sectional area, it will not lead to an increase in the size of the valve body 30a or problems with its strength. Therefore, there are also advantages such as: oil regeneration can be performed efficiently by suppressing pressure loss, and fuel efficiency can be improved.

[0052] Furthermore, the above embodiments illustrate an example of a hydraulic valve device for controlling the oil supply to the boom and arm hydraulic cylinders of a working machine, but it can also be applied to other hydraulic cylinders. In this case, it is not necessary to target multiple hydraulic cylinders; a single hydraulic cylinder can also be used.

[0053] Furthermore, in the stick directional switching valve 2A, the first stick valve core 41A and the axial stick oil passage 43B2 are arranged side by side in a parallel manner relative to the axial cylinder bottom oil passage 43A2 of the cylinder bottom oil passage 43AA. However, it is sufficient that the second stick valve core 41B (first stick valve core hole 32) is arranged side by side with respect to the axial cylinder bottom oil passage 43A2. Similarly, in the boom directional switching valve 2B, it is sufficient that the second boom valve core 42B (second boom valve core hole 34) is arranged side by side with respect to the axial stick oil passage 47B2 of the stick oil passage 47B.

[0054] Furthermore, in the above embodiment, the two stick valve cores 41A and 41B are configured to move in the same direction, and the two boom valve cores 42A and 42B are configured to move in the same direction, but the present invention is not limited to this. For example, it is also possible that, relative to the stick hydraulic cylinder 10, with the first valve core 41A configured in the neutral position, only the second valve core 41B is in the same direction. Figure 1 The piston rod moves to the left, connecting the regeneration port 32d to the second return oil throttle port 32c. In this state, oil is not supplied from the first hydraulic pump 1A to the boom hydraulic cylinder 10, but oil discharged from the boom chamber 11 is supplied to the cylinder bottom chamber 12 through the regeneration oil passage 46A. Therefore, in the working machine, the piston rod 14 extends relative to the cylinder body 13 of the boom hydraulic cylinder 10, thereby enabling the digging action of the boom AM.

[0055] Similarly, it could also be that, relative to the boom hydraulic cylinder 20, with the first valve core 42A configured in the neutral position, only the second valve core 42B is in the neutral position. Figure 1 The piston rod moves to the right, connecting the regeneration port 34d to the second return oil throttle port 34c. In this state, oil is not supplied from the second hydraulic pump 1B to the boom hydraulic cylinder 20, but oil discharged from the cylinder bottom chamber 22 is supplied to the rod chamber 21 through the regeneration oil passage 46B. Therefore, in the working machine, the piston rod 24 retracts relative to the cylinder body 23 of the boom hydraulic cylinder 20, thereby enabling the lowering action of the boom BM.

[0056] Symbol Explanation

[0057] Hydraulic pumps 1A and 1B

[0058] 10. Hydraulic cylinder for boom

[0059] 11. Bar Chamber (Second Oil Chamber)

[0060] 12. Cylinder bottom chamber (first oil chamber)

[0061] 20 Hydraulic cylinders for boom

[0062] 21. Bar Chamber (First Oil Chamber)

[0063] 22. Cylinder bottom chamber (second oil chamber)

[0064] 30 Hydraulic valve assembly

[0065] 30a Valve Body

[0066] 31 First boom valve core hole (first valve core hole)

[0067] 31a First pump oil supply port

[0068] 31b First oil inlet throttling port

[0069] 31c First return oil throttling port

[0070] 31d First fuel tank opening

[0071] 32 Second boom valve core hole (second valve core hole)

[0072] 32a Second Pump Oil Supply Port

[0073] 32b Second oil inlet throttle port

[0074] 32c Second Return Oil Throttling Port

[0075] 32d regenerated port

[0076] 32e Second fuel tank opening

[0077] 33 First boom valve core hole (first valve core hole)

[0078] 33a First Pump Oil Supply Port

[0079] 33b First oil inlet throttling port

[0080] 33c First return oil throttling port

[0081] 33d First fuel tank opening

[0082] 34 Second boom valve core hole (second valve core hole)

[0083] 34a Second Pump Oil Supply Port

[0084] 34b Second oil inlet throttle port

[0085] 34c Second Return Oil Throttling Port

[0086] 34d Regeneration Port

[0087] 34e Second fuel tank opening

[0088] 41A First boom valve core (first valve core)

[0089] 41B Second boom valve core (second valve core)

[0090] 42A First boom valve core (first valve core)

[0091] 42B Second boom valve core (second valve core)

[0092] 43A Bottom Oil Passage (First Oil Passage)

[0093] 43A2 Axial Cylinder Bottom Oil Passage Section (First Oil Passage Section)

[0094] 43B Rod Oil Passage (Second Oil Passage)

[0095] 43B2 Axial rod oil passage section (second oil passage section)

[0096] 46A Regenerated Oil Pathway

[0097] 46B Regenerated Oil Pathway

[0098] 47A Bottom Oil Passage (Second Oil Passage)

[0099] 47A2 Axial Cylinder Bottom Oil Passage Section (Second Oil Passage Section)

[0100] 47B Rod Oil Passage (First Oil Passage)

[0101] 47B2 Axial rod oil passage section (first oil passage section)

[0102] AM pole

[0103] BM boom

[0104] T fuel tank

Claims

1. A hydraulic valve device, characterized in that, The valve body is provided with a first valve core for controlling the oil supply to the first oil chamber of the hydraulic cylinder, and a second valve core for controlling the oil supply to the second oil chamber of the hydraulic cylinder. The first valve core hole, used to receive the first valve core, is provided with a first pump oil supply port connected to the hydraulic pump, a first oil inlet throttle port and a first oil return throttle port connected to the first oil chamber through a first oil passage, and a first oil tank port connected to the oil tank. The second valve core hole, used to receive the second valve core, is provided with a second pump oil supply port connected to the hydraulic pump, a second oil inlet throttle port and a second oil return throttle port connected to the second oil chamber through a second oil passage, and a second oil tank port connected to the oil tank. The first oil passage has a first oil passage portion, which is parallel to the axial direction of the second valve core hole and is arranged side by side with the second valve core hole. A regeneration port is provided in the second valve core hole, and a regeneration oil passage is provided between the regeneration port and the first oil passage to allow oil to flow from the regeneration port to the first oil passage. When oil is discharged from the second oil chamber, the regeneration port is connected to the second return oil throttle port.

2. The hydraulic valve device according to claim 1, characterized in that, In the valve body, the first valve core hole and the second valve core hole are arranged side by side with their axes parallel to each other. The second oil passage has a second oil passage portion, which is parallel to the axial direction of the first valve core hole and is arranged side by side with the first valve core hole.

3. The hydraulic valve device according to claim 1, characterized in that, The first oil passage is connected to the bottom chamber of the boom hydraulic cylinder, and the second oil passage is connected to the boom chamber of the boom hydraulic cylinder, which is used to drive the boom of the working machinery.

4. The hydraulic valve device according to claim 1, characterized in that, The first oil passage is connected to the rod chamber of the boom hydraulic cylinder, and the second oil passage is connected to the cylinder bottom chamber of the boom hydraulic cylinder, which is used to drive the boom of the working machinery.

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