Fluid pressure control valve device and fluid pressure system

Abstract

The present invention is a fluid pressure control valve device comprising: a first block having a first spool hole formed between a first end surface and a first coupling surface to accommodate a first spool valve, a first through hole formed on the side of the first end surface through which a bolt for fastening passes through the first spool hole, and a second through hole formed on the side of the first coupling surface concentric with the first through hole and having a seat surface for the bolt formed in the first spool hole; and a second block having a second spool hole formed between a second end surface and a second coupling surface to accommodate a second spool valve, and a screw hole formed on the side of the second coupling surface at a position corresponding to the first through hole for tightening the bolt.

Description

Technology Field

[0001] The present invention relates to a fluid pressure control valve device and a fluid pressure system having a plurality of spool valves. Background Technology

[0002] The casing of a hydraulic control valve device that controls the hydraulic pressure of a hydraulic shovel is constructed by connecting multiple blocks. Each block is provided with multiple spool valves (direction switching valves) that switch the direction of the hydraulic fluid. A hydraulic control valve device is constructed by combining these blocks in multiple rows. Blocks equipped with multiple spool valves are connected to each other, for example, by multiple bolts. The multiple bolts are arranged along the outer circumference of the end surface of the casing connecting the multiple blocks.

[0003] In casings, passages for hydraulic circuits are sometimes formed on the joint surfaces between blocks to allow hydraulic fluid to flow between them. In recent years, with the increase in hydraulic pressure, it has become necessary to increase the contact force of the joint surfaces to enhance the sealing of the passages formed on the joint surfaces. To increase the contact force, one can consider increasing the number of bolts connecting the blocks. In a configuration where multiple bolts are placed on the outer circumference of the casing, attempting to increase the contact force between blocks requires the casing to become larger to secure space for the bolts. Furthermore, since the degree of contact decreases in the area of ​​the joint surface extending inward from the periphery of the casing, it is necessary to form space for bolts in this area as well.

[0004] Patent Document 1 describes a casing in which a plurality of blocks are fastened together using a plurality of bolts. A plurality of spool valves are provided in the blocks constituting this casing. A plurality of spool holes are formed in the blocks for inserting the spool valves. The holes are formed in the direction of the joining surface of the blocks. A plurality of blocks are fastened by a plurality of fastening bolts provided in a direction perpendicular to the joining surface to form the casing. A plurality of bolts are provided along the periphery of both end surfaces of the casing. A bolt is also provided at a position between the plurality of spool holes on both end surfaces. Prior art literature

[0005] Japanese Patent Publication No. 2011-112123 The problem to be solved

[0006] In the casing described in Patent Document 1, if the fastening force of the bolt is increased to increase the contact force of the bonding surface of the block, there is a risk that the block will be compressed by the bolt and deformation will occur in the spool hole. Therefore, when the fastening force of the bolt is increased in this casing, it becomes necessary to form the spool hole larger to increase the clearance with the spool valve.

[0007] The present invention aims to provide a hydraulic control valve device and a construction machine equipped with a casing capable of increasing the degree of contact between blocks without deforming the shape of the spool hole. means of solving the problem

[0008] [1] A fluid pressure control valve device according to one embodiment of the present invention comprises a first block having a first spool hole formed between a first end surface and a first coupling surface to accommodate a first spool valve, a first through hole formed on the first end surface side through which a bolt for fastening passes through the first spool hole, and a second through hole formed on the first coupling surface side concentrically with the first through hole for a bolt hole on which a seat surface of the bolt is formed in the first spool hole, and a second block having a second spool hole formed between a second end surface and a second coupling surface to accommodate a second spool valve, and a screw hole formed on the second coupling surface side at a position corresponding to the first through hole through which the bolt is tightened.

[0009] By configuring it in this way, the second through hole and the screw hole are formed on the coupling surface side relative to the first spool hole and the second spool hole. Therefore, when the first block and the second block are connected by tightening a bolt through the screw hole formed in the second through hole, the first spool hole and the second spool hole are not deformed. Since the second through hole is formed by penetrating the first spool hole, the tightness of the coupling surface can be enhanced when tightening the bolt.

[0010] [2] The configuration described in [1] above may have at least one first through hole, a second through hole, and a screw hole formed in a low-pressure area within the first block and the second block.

[0011] [3] The configuration described in [1] or [2] above may be provided with a cap having a convex portion that blocks the first through hole.

[0012] [4] The configuration described in [1] or [2] above may be formed in the passage of the operating fluid of the actuator connected to the first spool valve.

[0013] [5] The configuration described in [1] or [2] above may be formed in the passage of the operating fluid of the relief valve connected to the first spool valve.

[0014] [6] A fluid pressure control valve device according to one embodiment of the present invention comprises: a first block having a first spool hole formed between a first end surface and a first coupling surface to accommodate a first spool valve, at least one first through hole formed on the first end surface side through which a bolt for fastening passes through the first spool hole, and a second through hole formed on the first coupling surface side concentrically with the first through hole for a bolt hole having a seat surface for the bolt formed in the first spool hole, a second block having a second spool hole formed between a second end surface and a second coupling surface and at least one screw hole formed on the second coupling surface side to which the bolt is tightened at a position corresponding to the first through hole, and a cap having a convex portion that blocks the first through hole, wherein the first through hole, the second through hole, and the screw hole are formed in a low pressure area inside the first block and the second block.

[0015] [7] A fluid pressure control valve device according to one embodiment of the present invention comprises: a first block having a first spool hole formed between a first end surface and a first coupling surface to accommodate a first spool valve, at least one first through hole formed on the first end surface side through which a bolt for fastening passes through the first spool hole, and a second through hole formed on the first coupling surface side concentric with the first through hole and having a seat surface for the bolt formed in the first spool hole; and a second block having a second spool hole formed between a second end surface and a second coupling surface to accommodate a second spool valve, and at least one screw hole formed on the second coupling surface side at a position corresponding to the first through hole through which the bolt is tightened, wherein the first through hole is formed in the passage of the operating fluid of an actuator connected to the first spool valve, and the first through hole, the second through hole, and the screw hole are formed inside the first block and the second block. It is formed in a low-pressure area.

[0016] [8] A fluid pressure control valve device according to one embodiment of the present invention comprises: a first block having a first spool hole formed between a first end surface and a first coupling surface to accommodate a first spool valve, at least one first through hole formed on the first end surface side through which a bolt for fastening passes through the first spool hole, and a second through hole formed on the first coupling surface side concentric with the first through hole and having a seat surface for the bolt formed in the first spool hole; and a second block having a second spool hole formed between a second end surface and a second coupling surface to accommodate a second spool valve, and at least one screw hole formed on the second coupling surface side at a position corresponding to the first through hole through which the bolt is tightened, wherein the first through hole is formed in the passage of the operating fluid of a relief valve connected to the first spool valve, and the first through hole, the second through hole, and the screw hole are formed in the first block and the second block in a low pressure area. It is formed in the area.

[0017] [9] A fluid pressure system according to one embodiment of the present invention may have a fluid pressure pump that generates fluid pressure by means of a working fluid, a fluid pressure valve device that switches the output location of the working fluid, an actuator driven by the working fluid supplied from the fluid pressure valve device, a first block having a first spool hole formed between a first end surface and a first coupling surface to accommodate a first spool valve, a first through hole formed on the first end surface side through which a bolt for fastening passes through the first spool hole, and a second through hole formed on the first coupling surface side concentric with the first through hole and a seat surface of the bolt formed in the first spool hole, and a second block having a second spool hole formed between a second end surface and a second coupling surface to accommodate a second spool valve, and a screw hole formed on the second coupling surface side at a position corresponding to the first through hole through which the bolt is tightened. Effects of the invention

[0018] According to the present invention, a fluid pressure control valve device and a fluid pressure system can be provided, which are equipped with a casing capable of increasing the degree of contact between blocks without deforming the shape of the spool hole. Brief explanation of the drawing

[0019] FIG. 1 is a schematic diagram of a construction machine in an embodiment of the present invention. FIG. 2 is a configuration diagram of a hydraulic system in an embodiment of the present invention. FIG. 3 is a drawing illustrating a hydraulic circuit of a hydraulic control valve device in an embodiment of the present invention. FIG. 4 is a cross-sectional view illustrating the configuration of a hydraulic control valve device in an embodiment of the present invention. FIG. 5 is a plan view illustrating the configuration of a hydraulic control valve device in an embodiment of the present invention. FIG. 6 is a drawing illustrating the configuration of a hydraulic control valve device according to a modified example in an embodiment of the present invention. FIG. 7 is a drawing illustrating the configuration of a hydraulic control valve device according to another variation of an embodiment of the present invention. Specific details for implementing the invention

[0020] Next, embodiments of the present invention will be described based on the drawings.

[0021] (Construction machinery)

[0022] As illustrated in FIG. 1, the construction machine (100) is, for example, a hydraulic shovel. The construction machine (100) is equipped with a swivel body (101) and a driving body (102). The swivel body (101) is swivelly mounted on the driving body (102). The swivel body (101) is equipped with a hydraulic system (1).

[0023] The slewing body (101) is equipped with a cab (103) in which an operator can ride, a boom (104) with one end oscillatingly connected to the cab (103), an arm (105) with one end oscillatingly connected to the other end (front end) of the boom (104) opposite to the cab (103), and a bucket (106) with the other end (front end) of the arm (105) oscillatingly connected to the boom (104) opposite to the boom. Additionally, a hydraulic system (1) is provided inside the cab (103). The cab (103), boom (104), arm (105), and bucket (106) are driven by hydraulic fluid supplied from this hydraulic system (1).

[0024] (Hydraulic system)

[0025] As illustrated in FIG. 2, the hydraulic system (1) (fluid pressure system) comprises an engine (120) serving as a driving source, a hydraulic pump (130) (fluid pressure pump) driven by the engine (120), a plurality of actuators (140) that operate each part of the construction machine (100), a hydraulic control valve device (150) (fluid pressure valve device) that switches the operation of the plurality of actuators (140), a tank (160) that stores hydraulic fluid, and a relief valve (300) for pressure adjustment. In this embodiment, hydraulic fluid is exemplified as an example of fluid pressure, but the working fluid may be any fluid other than hydraulic fluid. The fluid pressure system may be applied not only to the construction machine but also to other devices that control a plurality of actuators.

[0026] The engine (120) is an internal combustion engine that uses gasoline or diesel fuel. The engine (120) is equipped with an output shaft (121), and the output shaft (121) is connected to a hydraulic pump (130). A passage Q is connected to the hydraulic pump (130). The hydraulic pump (130) generates fluid pressure by means of a working fluid. The hydraulic pump (130) is driven by the output shaft (121) to circulate working fluid through passage Q. The working fluid supplied to passage Q flows through tank passage U and returns to the tank (160). A hydraulic control valve device (150) is connected to passage Q.

[0027] A hydraulic control valve device (150) switches the output location of the working fluid. A plurality of actuators (140) are connected to the hydraulic control valve device (150) through a branched passage Q. In FIG. 2, one actuator (140) is depicted. A plurality of hydraulic control valve devices (150) are provided, and the hydraulic pressure of the working fluid flowing through passage Q is switched to a plurality of valves to supply working fluid to a plurality of actuators (140). The plurality of actuators (140) drive a cap (103), a boom (104), an arm (105), and a bucket (106), etc. A relief valve (300) releases pressure when the pressure of the fluid path within the hydraulic circuit of the hydraulic system (1) becomes greater than or equal to a preset value.

[0028] (Hydraulic control valve device)

[0029] As illustrated in FIG. 3, the hydraulic control valve device (150) (fluid pressure control valve device) comprises a casing (151) in which a plurality of blocks are connected. In this embodiment, the casing (151) is exemplified by having two sets of blocks. A coupling surface (one surface A1, one surface B1) is formed on the contact surface between the first block A and the second block B.

[0030] The first block A is equipped with a plurality of spool valves S. A passage Q from a hydraulic pump (130) is connected to the plurality of spool valves S, and a tank passage U is connected to a tank (160). The second block B is equipped with a plurality of spool valves T. A passage Q from a hydraulic pump (130) is connected to the plurality of spool valves T, and a tank passage U is connected to a tank (160).

[0031] As illustrated in FIGS. 4 and 5, the casing (151) comprises a first block A formed in a roughly rectangular shape and a second block B formed in a roughly rectangular shape. Hereinafter, in the drawings, the view in the -z direction is considered to be a plane.

[0032] The first block A and the second block B are connected by a plurality of bolts M. The plurality of bolts M are inserted into a plurality of bolt holes (not shown) formed along the periphery of the first block A when viewed in a planar view, and are fixed by screwing into screw holes (not shown) formed at positions corresponding to the plurality of bolt holes along the periphery of the second block B. The bolts M are, for example, hexagonal bolts. The bolts M may be of a different type. In the first block A, the seat surface of the bolt M is formed to be exposed to the outside in a stepped manner so as to approach the one surface A1, which serves as the joining surface, from the other surface A2. The first block A and the second block B are also connected by a plurality of bolts C, as described below.

[0033] A first block A has a flat first coupling surface formed on one side A1. A second side A2 of the first block A is formed on the first end surface of the casing (151). A second block B has a flat second coupling surface formed on one side B1. A second block B has a second end surface B2 formed on the second end surface of the casing (151). The first block A and the second block B are connected in a state where the first coupling surface (one side A1) and the second coupling surface (one side B1) are in contact.

[0034] The first block A comprises at least one plurality of spool valves S (first spool valves). The spool valves S are arranged such that their long sides follow the direction of one side A1. The plurality of spool valves S are arranged in parallel such that their long sides follow the direction of one side A1, thereby forming a spool valve group (first spool valve group).

[0035] The spool valve S comprises a movable spool S1 and a hydraulic chamber S6 that controls the movement of spool S1. Spool S1 is formed approximately circumferentially. A plurality of grooves S2 to S5, which serve as passages for hydraulic fluid, are formed circumferentially on spool S1. The hydraulic chamber S6 is equipped with a spring S7, and the movement of spool S1 along its long side is controlled by resisting the force of the spring S7 through the pressure of the hydraulic chamber S6.

[0036] In the first block A, a plurality of spool holes H (first spool holes) are formed adjacently to secure a plurality of spool valves S. The spool holes H are formed with a circular cross-section. A spool S1 is inserted into the spool holes H. The spool holes H movably accommodate the spool S1. The spool holes H are arranged so that the direction of the longer side follows the direction of the surface of one surface A1.

[0037] A plurality of spool holes H are arranged in parallel such that their long side directions follow the direction of one surface A1, thereby forming a spool hole group (a first spool hole group). A plurality of passages H1 to H7 of the hydraulic fluid, which is switched by spool S1, are connected to the spool holes H. Passages H1 and H7 are, for example, ports of an actuator.

[0038] In the first block A, a plurality of through holes K are formed that penetrate the other side A2 and the one side A1 when viewed in a planar view. The through holes K are formed in an area within the contour of the first block A when viewed in a planar view. The through holes K are formed with a circular cross-section. The through holes K are formed penetrating in a direction perpendicular to the spool hole H when viewed from the direction along the one side A1. The through holes K may be formed at an angle when viewed from the direction along the one side A1 as well as in a direction perpendicular to the spool hole H.

[0039] Through hole K is formed with a first through hole K1 penetrating from side surface A2 to spool hole H in a direction perpendicular to spool hole H, and a second through hole K2 penetrating from spool hole H to side surface A1 in a direction perpendicular to spool hole H. When viewed in a planar view, the first through hole K1 and the second through hole K2 are formed concentrically.

[0040] A first through hole K1 is formed from the blowing surface A2 to the spool hole H. A second through hole K2 is formed from the spool hole H to the side of one face A1. The diameter of the first through hole K1 is formed to a size through which bolt C passes. A cap P is installed on the blowing surface A2 of the first through hole K1 to close it. The cap P has a convex portion P1 that closes the opening of the first through hole K1. The cap P may be formed such that P1 is twist-type or snap-type. Bolt C is inserted through the first through hole K1. Bolt C passes through the first through hole K1 and reaches the second through hole K2.

[0041] The second through hole K2 is formed inside the first block A. The second through hole K2 has a large diameter hole and a small diameter hole. The large diameter hole is formed with the same diameter as the first through hole K1. The small diameter hole is formed with the diameter of the screw hole of bolt C. A stepped seat surface K3 is formed at the portion where the large diameter hole and the small diameter hole connect. The stepped seat surface K3 is formed with an enlarged diameter on the side facing the spool hole H. The seat surface K3 supports the head portion C2 of the connecting bolt C. The seat surface K3 is provided on the side A1 side above the spool hole H. By making a part of the spool hole H into a through hole through which bolt C passes, the degree of contact between the first block A and the second block B can be increased without deforming the shape of the spool hole H. Bolt C is, for example, a hexagonal hole bolt (cap screw) in which a hexagonal hole is formed in the head portion C2.

[0042] In the first block A, the seat surface K3 is formed in a stepped shape between the spool hole H in the second through hole K2 and one surface A1. The bolt C may be a tapered bolt, the contact surface of the head portion being formed in a tapered shape. The seat surface K3 may not only be formed in a stepped shape, but may also be formed in a tapered shape corresponding to the tapered bolt.

[0043] As described below, the second through hole K2 is formed with a diameter slightly larger than the diameter of the threaded portion C1 of bolt C. The seat surface K3 is formed with a diameter larger than the diameter of the head portion C2 of bolt C. Inside the first block A, the distance between the seat surface K3 and one surface A1 is formed to be shorter than the distance between the spool hole H and one surface A1. That is, the seat surface K3 is formed to be closer to one surface A1 than to the spool hole H.

[0044] A bolt C inserted from the first through hole K1 is inserted into the second through hole K2. The bolt C is screw-inserted into the bolt hole D, which will be described later and is formed in the second block B. When the bolt C is tightened, the head portion C2 of the bolt C comes into contact with the seat surface K3.

[0045] The second block B comprises at least one plurality of spool valves T (second spool valves). The spool valves T are arranged such that their long sides follow the direction of one side B1. The plurality of spool valves T are arranged in parallel such that their long sides follow the direction of one side B1, thereby forming a spool valve group (second spool valve group).

[0046] The spool valve T comprises a movable spool T1 and a hydraulic chamber T6 that controls the movement of spool T1. Spool T1 is formed approximately circumferentially. A plurality of grooves T2 to T5, which serve as passages for hydraulic fluid, are formed circumferentially on spool T1. The hydraulic chamber T6 is equipped with a spring T7, and the movement of spool T1 along its long side is controlled by resisting the force of the spring T7 through the pressure of the hydraulic chamber T6.

[0047] In the second block B, a plurality of spool holes I (second spool holes) are formed adjacently to secure a plurality of spool valves T. Spool holes I are formed with a circular cross-section. Spool T1 is inserted into spool holes I. Spool holes I movably accommodate spool T1. Spool holes I are arranged so that the direction of the longer side follows the direction of the surface of one surface B1.

[0048] A plurality of spool holes I are arranged in parallel such that their long side directions follow the direction of one surface B1, thereby forming a spool hole group (a second spool hole group). A plurality of passages I1 to I6 of the hydraulic fluid, which is switched by spool T1, are connected to spool holes I. Passages I1 and I6 are, for example, ports of an actuator.

[0049] In the second block B, a bolt hole D is formed on the side of one surface B1 when viewed in a planar view. The bolt hole D is formed in an area facing inward from the periphery of the second block B when viewed in a planar view. The bolt hole D is formed with a circular cross-section. The bolt hole D is formed as a female thread that screws into the threaded portion C1 of the bolt C. The bolt hole D is formed in a direction perpendicular to the spool hole I when viewed from the direction along one surface B1. The bolt hole D may be formed at an angle when viewed from the direction along one surface B1 as well as in a direction perpendicular to the spool hole I. The bolt hole D does not penetrate the spool hole I. The bolt hole D is formed on one surface B1 at a position corresponding to the second through hole K2 formed on one surface A1. When viewed in a planar view, the bolt hole D and the second through hole K2 are formed concentrically.

[0050] In the interior of the second block B, the distance between the bolt hole D and one surface B1 is formed to be shorter than the distance between the spool hole I and one surface B1. That is, the bolt hole D is formed to be closer to one surface B1 than to the spool hole I. On one surface B1, an annular groove D1 is formed around the bolt hole D. An elastic member G, such as an O-ring, is installed in D1 to prevent oil leakage and increase sealing performance. With the above configuration, the second through hole K2 and the first through hole K1 are connected to reach the bolt hole D.

[0051] When connecting the first block A and the second block B according to the above configuration, the process is performed without spool valves S and T being inserted into spool holes H and I. A spool may be present in spool hole I. The first block A and the second block B are installed in an overlapping state such that the opposite side A2 of the first block A becomes the upper surface. Bolt C is inserted through the opening of the first through hole K1 formed on the opposite side A2 of the first block A. Bolt C drops through the first through hole K1, and the threaded portion C1 is inserted into the second through hole K2. The lower end of the threaded portion C1 contacts the opening of the bolt hole D of the second block B. Using a hex wrench or the like, the bolt is engaged with the hexagonal hole formed in the head portion C2 of Bolt C through the first through hole K1.

[0052] When the hex wrench is rotated, the threaded portion C1 of bolt C is screwed into bolt hole D. As bolt C is screwed in, and the lower end of the head portion C2 comes into contact with seat surface K3, bolt C is tightened to the specified torque. As a result, one surface A1 and one surface B1 are in close contact. On one surface B1, the elastic member G positioned around bolt hole D is deformed and adheres, increasing the sealing performance around bolt C. In this state, bolt C applies force in the direction of bringing the first block A and the second block B into close contact with the joining surfaces (one surface A1, one surface B1) in between.

[0053] In this state, since bolt C is positioned between the spool hole H formed in the first block A and the spool hole I formed in the second block B, it becomes difficult for deformation caused by the fastening of bolt C to occur. The through hole K and bolt hole D are provided in an area such as near a low-pressure tank passage U (see FIG. 2 and 3) inside the casing (151), for example. Bolt C fastens the first block A and the second block B inside the casing (151).

[0054] The through hole K and the bolt hole D may be formed at locations other than those mentioned above. The through hole K and the bolt hole D may be provided in an area where there is a risk of oil leakage due to a high disparity between the first block A and the second block B. After tightening the bolt C, the opening of the second through hole K2 is closed by the cap P.

[0055] [Variation Example]

[0056] Hereinafter, a modified example of the hydraulic control valve device (150) will be described. In the following description, the same names and symbols will be used for components identical to the above embodiment, and redundant descriptions will be appropriately omitted. In the above embodiment, the first through hole K1 formed in the first block A is closed by a cap P. The first through hole K1 may be used for other purposes.

[0057] As illustrated in FIG. 6, the first through hole K1 may be used as a passage through which hydraulic fluid flows. The first through hole K1 may be used, for example, as a connection port for a passage to actuate an actuator. The first through hole K1 is used, for example, as a passage for hydraulic fluid for an actuator that is switched by a spool (not shown) having a spool valve S. A passage connection member F is installed in the opening of the first through hole K1 formed on the other surface A2.

[0058] As illustrated in FIG. 7, the first through hole K1 may be used as a passage for hydraulic fluid to operate a relief valve that adjusts the pressure of the hydraulic fluid. A relief valve (300) is installed in the opening of the first through hole K1 formed in the other surface A2. A passage K4 for hydraulic fluid that opens from the relief valve (300) is formed in the first through hole K1.

[0059] As described above, according to the hydraulic control valve device (150), since the seat surface of bolt C and the bolt hole D for connecting the first block A and the second block B are formed inside the first block A and the second block B, there is no need to secure space to increase the seat surface of bolt C around the end surface of the first block A, so the device configuration can be miniaturized.

[0060] Since the seat surface and bolt hole D of bolt C are formed between the spool hole H formed in the first block A and the spool hole I formed in the second block B, the spool holes H and I are not deformed even when bolt C is tightened, and the first block A and the second block B can be brought into close contact.

[0061] Furthermore, the present invention is not limited to the embodiments described above, and includes various modifications to the embodiments described above within the scope of not departing from the spirit of the present invention. For example, the hydraulic control valve device may be configured by connecting two or more blocks. The hydraulic control valve device may use stud bolts and nuts instead of bolt C. In addition, the hydraulic system (1) may be applied not only to construction machinery but also to other devices that use working fluid, such as hydraulic presses. Industrial applicability

[0062] According to the present invention, a fluid pressure control valve device and a fluid pressure system can be provided, which are equipped with a casing capable of increasing the degree of contact between blocks without deforming the shape of the spool hole. Explanation of the symbols

[0063] 1: Hydraulic system 100: Construction Machinery 101: Rotating body 102: Driving body 103: Cap 104: Boom 105: Am 106: Bucket 120: Engine 121: Output axis 130: Hydraulic pump 140: Actuator 150: Hydraulic control valve unit 151: Casing 160: Tank 300: Relief valve A: Block 1 A1: One side (first connection surface) A2: If you hit it B: Block 2 B1: One side (second connecting surface) B2: Hit C: Bolt C1: Screw part C2: Head section D: Bolt hole D1: Home F: Connection member G: Elastic member H: Spool hole (1st spool hole) H1 to H7: Passage I: Spool hole I1 to I6: Passage K: Through hole K1: 1st penetration hole K2: Second penetration hole K3: Seat surface K4: Passage M: Bolt P: Cap P1: Convex part Q: Passage S: Spool valve S1: Spool S2 to S5: Home S7: Spring T: Spool valve T1: Spool T2 to T5: Home T6: Hydraulic room T7: Spring U: Tank passage

Claims

Claim 1 A fluid pressure control valve device comprising: a first block having a first spool hole formed between a first end surface and a first coupling surface to accommodate a first spool valve, a first through hole formed on the first end surface side through which a bolt for fastening passes through the first spool hole, and a second through hole formed on the first coupling surface side concentric with the first through hole and having a seat surface for the bolt formed in the first spool hole; and a second block having a second spool hole formed between a second end surface and a second coupling surface to accommodate a second spool valve, and a screw hole formed on the second coupling surface side at a position corresponding to the first through hole through which the bolt is tightened. Claim 2 A fluid pressure control valve device according to claim 1, wherein each of the first spool valve and the second spool valve is connected to a passage through which an operating fluid generating fluid pressure is supplied, and at the same time, a tank passage having a lower pressure than the passage is connected, and the first through hole, the second through hole, and the screw hole are formed in at least one area within the first block and the second block that is a low-pressure area within the first spool hole and the second spool hole, and also a low-pressure area on the tank passage side. Claim 3 A fluid pressure control valve device according to claim 1 or 2, comprising a cap having a convex portion that blocks the first through hole. Claim 4 A fluid pressure control valve device according to claim 1 or 2, wherein the first through hole is formed in the passage of the operating fluid of an actuator connected to the first spool valve. Claim 5 A fluid pressure control valve device according to claim 1 or 2, wherein the first through hole is formed in the passage of the operating fluid of a relief valve connected to the first spool valve. Claim 6 A first block is provided with a first spool hole formed between a first end surface and a first coupling surface to accommodate a first spool valve, at least one first through hole formed on the first end surface side through which a bolt for fastening passes through the first spool hole, and a second through hole formed on the first coupling surface side concentric with the first through hole and having a seat surface for the bolt formed in the first spool hole; a second block is provided with a second spool hole formed between a second end surface and a second coupling surface to accommodate a second spool valve, and at least one screw hole formed on the second coupling surface side at a position corresponding to the first through hole through which the bolt is tightened; and a cap having a convex portion that blocks the first through hole. Each of the first spool valve and the second spool valve is connected to a passage through which an operating fluid that generates fluid pressure is supplied, and simultaneously connected to a tank passage having a lower pressure than the passage. The first through hole, the second through hole, and the screw hole are A fluid pressure control valve device formed in the interior of the first block and the second block, wherein the pressure is low in the area inside the first spool hole and the area inside the second spool hole, and also in the area on the side of the tank passage where the pressure is low. Claim 7 A first block is provided with a first spool hole formed between a first end surface and a first coupling surface to accommodate a first spool valve, at least one first through hole formed on the first end surface side through which a bolt for fastening passes through the first spool hole, and a second through hole formed on the first coupling surface side concentric with the first through hole and having a seat surface for the bolt formed in the first spool hole; and a second block is provided with a second spool hole formed between a second end surface and a second coupling surface to accommodate a second spool valve, and at least one screw hole formed on the second coupling surface side at a position corresponding to the first through hole through which the bolt is tightened, wherein the first through hole is formed in a passage for the operating fluid of an actuator connected to the first spool valve, and each of the first spool valve and the second spool valve is connected to a passage through which an operating fluid that generates fluid pressure is supplied, and at the same time, a tank passage having a lower pressure than the said passage is connected, and the first A fluid pressure control valve device in which a through hole, a second through hole, and a screw hole are formed in the interior of the first block and the second block, in a low-pressure area within the first spool hole and the second spool hole, and also in a low-pressure area on the tank passage side. Claim 8 A first block is provided with a first spool hole formed between a first end surface and a first coupling surface to accommodate a first spool valve, at least one first through hole formed on the first end surface side through which a bolt for fastening passes through the first spool hole, and a second through hole formed on the first coupling surface side concentrically with the first through hole and having a seat surface for the bolt formed in the first spool hole; and a second block is provided with a second spool hole formed between a second end surface and a second coupling surface to accommodate a second spool valve, and at least one screw hole formed on the second coupling surface side at a position corresponding to the first through hole through which the bolt is tightened, wherein the first through hole is formed in a passage for the operating fluid of a relief valve connected to the first spool valve, and each of the first spool valve and the second spool valve is connected to a passage through which an operating fluid that generates fluid pressure is supplied, and simultaneously connected to a tank passage having a lower pressure than the passage, and the first through hole A fluid pressure control valve device in which a hole, the second through hole, and the screw hole are formed in the interior of the first block and the second block, in a low-pressure area within the first spool hole and the second spool hole, and also in a low-pressure area on the tank passage side. Claim 9 A fluid pressure system comprising: a fluid pressure pump that generates fluid pressure by a working fluid; an actuator driven by the working fluid supplied from the fluid pressure pump; a first block having a first spool hole formed between a first end surface and a first coupling surface to accommodate a first spool valve, a first through hole formed on the first end surface side through which a bolt for fastening passes through the first spool hole, and a second through hole formed on the first coupling surface side concentric with the first through hole and having a seat surface for the bolt formed in the first spool hole; and a second block having a second spool hole formed between a second end surface and a second coupling surface to accommodate a second spool valve, and a screw hole formed on the second coupling surface side at a position corresponding to the first through hole through which the bolt is tightened.

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