Fluid pressure control valve device and fluid pressure system

Abstract

The present invention provides a fluid pressure control valve device and a fluid pressure system. The present invention is a fluid pressure control valve device comprising: a first block having a first spool hole formed between a first end face and a first mating surface for accommodating a first spool valve; a first through-hole formed on the first end face side of the first spool hole for receiving a fastening bolt; a second through-hole formed on the first mating surface side of the first spool hole for receiving a second spool valve; and a second block having a second spool hole formed between a second end face and a second mating surface for receiving a second spool valve; and a threaded hole formed on the second mating surface side for receiving the bolt at a position corresponding to the first through-hole.

Description

Technical Field

[0001] The present invention relates to a fluid pressure control valve device and a fluid pressure system including a plurality of slide valves. Background Art

[0002] The housing of a hydraulic control valve device, which controls the hydraulic pressure of a hydraulic excavator, is constructed by connecting multiple blocks. Each block is equipped with multiple slide valves (directional switching valves) that switch the direction of the hydraulic oil. These blocks are combined in multiple rows to form the hydraulic control valve device. The blocks equipped with the multiple slide valves are fastened to each other, for example, using multiple bolts. The bolts are arranged along the outer circumference of the end surface of the housing formed by connecting the multiple blocks.

[0003] Sometimes, in a housing, passages for a hydraulic circuit are formed on the mating surfaces between the blocks to allow the working oil to flow between the blocks. In recent years, with the increase in hydraulic pressure, in order to improve the airtightness of the passages formed on the mating surfaces, it is also necessary to improve the sealing force of the mating surfaces. In order to improve the sealing force, a solution is considered to increase the number of bolts that fasten the blocks together. In a structure in which a plurality of bolts are arranged on the outer periphery of the housing, if the sealing force between the blocks is to be increased, the housing will be enlarged to ensure space for the bolts. In addition, at the mating surface, the sealing degree of the area closer to the inside than the surrounding area of ​​the housing is lower, so space for bolts is also required in this area.

[0004] Patent Document 1 describes a housing constructed by fastening multiple blocks together using multiple bolts. The blocks that constitute this housing are equipped with multiple spool valves. The blocks are formed with multiple valve stem holes for inserting the spool valves. These holes are formed along the mating surfaces of the blocks. The blocks are fastened together using multiple fastening bolts arranged perpendicular to the mating surfaces, thereby forming the housing. The bolts are arranged around both end surfaces of the housing. Bolts are also located between the valve stem holes on both end surfaces.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 2011-112123 Summary of the Invention

[0008] Problems to be solved by the invention

[0009] In the housing described in Patent Document 1, if the bolt tightening force is increased to improve the tightness of the mating surfaces of the block, the block may be compressed by the bolt, causing deformation in the spool hole. Therefore, in order to increase the bolt tightening force in this housing, the spool hole must be enlarged to increase the clearance between the spool hole and the spool valve.

[0010] An object of the present invention is to provide a hydraulic control valve device and a construction machine including a housing capable of improving the close fit between blocks without deforming the shape of a spool hole.

[0011] Solutions for solving problems

[0012] [1] A fluid pressure control valve device according to a technical solution of the present invention comprises: a first block, which has a first valve column hole for accommodating a first sliding valve formed between a first end face and a first mating face, a first through hole for passing a fastening bolt is formed in the first valve column hole on the first end face side, a second through hole for a bolt hole is formed in the first valve column hole on the first mating face side in a manner concentric with the first through hole, and a supporting surface for the bolt is formed in the second through hole for the bolt; and a second block, which has a second valve column hole for accommodating a second sliding valve formed between a second end face and a second mating face, and a threaded hole for screwing the bolt into is formed on the second mating face side at a position corresponding to the first through hole.

[0013] With this configuration, the second through-hole and the threaded hole are formed on the mating surface side relative to the first and second spool holes. Therefore, when a bolt is passed through the bolt hole formed in the second through-hole and screwed into the threaded hole to connect the first and second blocks, the first and second spool holes do not deform. Since the second through-hole is formed to penetrate the first spool hole, the tightness of the mating surface can be improved when the bolt is screwed in.

[0014] [2] According to the structure described in [1] above, at least one of the first through hole, the second through hole, and the threaded hole may be formed in a low-pressure region inside the first block and the second block.

[0015] [3] According to the structure described in [1] or [2] above, the fluid pressure control valve device may include a cover having a convex portion that closes the first through hole.

[0016] [4] According to the structure described in [1] or [2] above, the first through hole may be formed as a passage for hydraulic oil of an actuator connected to the first slide valve.

[0017] [5] According to the structure described in [1] or [2] above, the first through hole may be formed as a passage for the working oil of the relief valve connected to the first slide valve.

[0018] [6] A fluid pressure control valve device according to a technical solution of the present invention comprises: a first block, which has a first valve column hole for accommodating a first sliding valve formed between a first end face and a first mating face, at least one first through hole for a fastening bolt to pass through formed in the first valve column hole on the first end face side, a second through hole for a bolt hole formed in the first valve column hole on the first mating face side in a manner concentric with the first through hole, and a supporting surface for the bolt formed in the second through hole; a second block, which has a second valve column hole for accommodating a second sliding valve formed between a second end face and a second mating face, at least one threaded hole for screwing into formed on the second mating face side at a position corresponding to the first through hole; and a cover having a convex portion for sealing the first through hole, wherein the first through hole, the second through hole, and the threaded hole are formed in a relatively low-pressure area inside the first block and the second block.

[0019] [7] A fluid pressure control valve device according to a technical solution of the present invention comprises: a first block, which has a first valve column hole for accommodating a first sliding valve formed between a first end face and a first mating face, at least one first through hole for a fastening bolt to pass through formed in the first valve column hole on the first end face side, a second through hole for a bolt hole formed in the first valve column hole on the first mating face side in a manner concentric with the first through hole, and a supporting surface for the bolt formed in the second through hole; and a second block, which has a second valve column hole for accommodating a second sliding valve formed between a second end face and a second mating face, at least one threaded hole for screwing into formed on the second mating face side at a position corresponding to the first through hole, the first through hole forming a passage for working oil of an actuator connected to the first sliding valve, the first through hole, the second through hole, and the threaded hole formed in a relatively low pressure area inside the first block and the second block.

[0020] [8] A fluid pressure control valve device according to a technical solution of the present invention comprises: a first block, which has a first valve column hole for accommodating a first sliding valve formed between a first end face and a first mating face, at least one first through hole for a fastening bolt to pass through formed in the first valve column hole on the first end face side, a second through hole for a bolt hole formed in the first valve column hole on the first mating face side in a manner concentric with the first through hole, and a supporting surface for the bolt formed in the second through hole; and a second block, which has a second valve column hole for accommodating a second sliding valve formed between a second end face and a second mating face, at least one threaded hole for screwing into formed on the second mating face side at a position corresponding to the first through hole, the first through hole forming a passage for working oil of a relief valve connected to the first sliding valve, the first through hole, the second through hole, and the threaded hole formed in a relatively low pressure area inside the first block and the second block.

[0021] [9] A fluid pressure system of a technical solution of the present invention comprises: a fluid pressure pump that generates fluid pressure using a working fluid; an actuator that is driven by the working fluid supplied from the fluid pressure pump; and a fluid pressure control valve device that switches the output object of the working fluid, the fluid pressure control valve device comprising: a first block, which has a first valve column hole for accommodating a first sliding valve formed between a first end face and a first mating face, a first through hole for passing a fastening bolt is formed in the first valve column hole on the first end face side, a second through hole for a bolt hole is formed in the first valve column hole on the first mating face side in a manner concentric with the first through hole, and a supporting surface for the bolt is formed in the second through hole for the bolt hole; and a second block, which has a second valve column hole for accommodating a second sliding valve formed between a second end face and a second mating face, and a threaded hole for screwing the bolt into is formed on the second mating face side at a position corresponding to the first through hole.

[0022] Effects of the Invention

[0023] According to the present invention, it is possible to provide a fluid pressure control valve device and a fluid pressure system including a housing capable of improving the close fit between blocks without deforming the shape of a spool hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of a construction machine according to an embodiment of the present invention.

[0025] Figure 2 It is a structural diagram of a hydraulic system according to an embodiment of the present invention.

[0026] Figure 3 It is a diagram showing a hydraulic circuit of a hydraulic control valve device according to an embodiment of the present invention.

[0027] Figure 4 It is a cross-sectional view showing the structure of a hydraulic control valve device according to an embodiment of the present invention.

[0028] Figure 5 It is a plan view showing the structure of a hydraulic control valve device according to an embodiment of the present invention.

[0029] Figure 6 It is a diagram showing the configuration of a hydraulic control valve device according to a modified example of the embodiment of the present invention.

[0030] Figure 7 It is a diagram showing the structure of a hydraulic control valve device according to another modified example of the embodiment of the present invention.

[0031] Description of Reference Numerals

[0032] 1. Hydraulic system; 100. Construction machinery; 101. Rotating unit; 102. Traveling unit; 103. Cab; 104. Boom; 105. Arm; 106. Bucket; 120. Engine; 121. Output shaft; 130. Hydraulic pump; 140. Actuator; 150. Hydraulic control valve assembly; 151. Housing; 160. Tank; 300. Relief valve; A. First block; A1. One side (first mating surface); A2. Other side; B. Second block; B1. One side (second mating surface); B2. Other side; C. Bolt; C1. Threaded portion ; C2, head; D, bolt hole; D1, groove; F, connecting member; G, elastic member; H, valve column hole (1st valve column hole); H1~H7, passage; I, valve column hole; I1~I6, passage; K, through hole; K1, 1st through hole; K2, 2nd through hole; K3, supporting surface; K4, passage; M, bolt; P, cover; P1, convex part; Q, passage; S, sliding valve; S1, valve column; S2~S5, groove; S7, spring; T, sliding valve; T1, valve column; T2~T5, groove; T6, hydraulic chamber; T7, spring; U, tank passage. DETAILED DESCRIPTION

[0033] Next, embodiments of the present invention will be described with reference to the drawings.

[0034] (Construction Machinery)

[0035] like Figure 1 As shown, the construction machine 100 is, for example, a hydraulic excavator. The construction machine 100 includes a revolving structure 101 and a traveling structure 102. The revolving structure 101 is rotatably mounted on the traveling structure 102. The revolving structure 101 is provided with a hydraulic system 1.

[0036] The revolving structure 101 includes a cab 103 in which the operator can sit; a boom 104, one end of which is swingably connected to the cab 103; an arm 105, one end of which is swingably connected to the other end (top end) of the boom 104 on the opposite side from the cab 103; and a bucket 106, which is swingably connected to the other end (top end) of the arm 105 on the opposite side from the boom 104. A hydraulic system 1 is installed within the cab 103. The cab 103, boom 104, arm 105, and bucket 106 are driven by hydraulic oil supplied from the hydraulic system 1.

[0037] (Hydraulic System)

[0038] like Figure 2 As shown, the hydraulic system 1 (fluid pressure system) includes: an engine 120 as a driving source; a hydraulic pump 130 (fluid pressure pump) driven by the engine 120; a plurality of actuators 140 that operate various parts 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 oil; and a relief valve 300 for pressure adjustment. In this embodiment, hydraulic pressure is illustrated as an example of fluid pressure, but the working fluid can be not only hydraulic oil but also other fluids. The fluid pressure system can be applied not only to construction machines but also to other devices that control a plurality of actuators.

[0039] Engine 120 is an internal combustion engine that uses gasoline or diesel fuel. Engine 120 includes an output shaft 121, which is connected to a hydraulic pump 130. Hydraulic pump 130 is connected to passage Q. Hydraulic pump 130 generates fluid pressure using working fluid. Driven by output shaft 121, hydraulic pump 130 flows hydraulic fluid through passage Q. The hydraulic fluid supplied to passage Q flows through tank passage U and returns to tank 160. A hydraulic control valve device 150 is connected to passage Q.

[0040] The hydraulic control valve device 150 switches the output destination of the working fluid. The hydraulic control valve device 150 is connected to a plurality of actuators 140 via a branched passage Q. Figure 2 , a single actuator 140 is depicted. Multiple hydraulic control valve devices 150 are provided, and the multiple valves switch the hydraulic pressure of the hydraulic oil flowing through passage Q to supply hydraulic oil to the multiple actuators 140. The multiple actuators 140 drive the cab 103, boom 104, arm 105, bucket 106, and the like. The relief valve 300 releases pressure when the pressure in the flow path exceeds a predetermined value set in advance within the hydraulic circuit of the hydraulic system 1.

[0041] (Hydraulic control valve device)

[0042] like Figure 3As shown, a hydraulic control valve device 150 (fluid pressure control valve device) includes a housing 151 formed by connecting multiple blocks. In this embodiment, the housing 151 is illustrated as a housing having two rows of blocks. The contact surfaces between the first block A and the second block B form a mating surface (one surface A1 and one surface B1).

[0043] The first block A includes a plurality of spool valves S. A passage Q from the hydraulic pump 130 and a tank passage U to the tank 160 are connected to the spool valves S. The second block B includes a plurality of spool valves T. A passage Q from the hydraulic pump 130 and a tank passage U to the tank 160 are connected to the spool valves T.

[0044] like Figure 4 and Figure 5 As shown in FIG, the housing 151 includes a first block A formed in a substantially rectangular parallelepiped shape and a second block B formed in a substantially rectangular parallelepiped shape. In the drawings, the view viewed in the −z direction is referred to as a plan view.

[0045] 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 from above, and are threadedly engaged with and fixed to threaded holes (not shown) formed along the periphery of the second block B at positions corresponding to the plurality of bolt holes. The bolts M are, for example, hexagon socket bolts. The bolts M may also be other types of bolts. In the first block A, the supporting surface of the bolts M is formed in a stepped manner so as to be exposed to the outside from the other surface A2 close to the one surface A1 serving as the mating surface. The first block A and the second block B are further connected by a plurality of bolts C as will be discussed later.

[0046] The first block A has a flat first mating surface formed on one side A1. The other side A2 of the first block A forms the first end face of the housing 151. The second block B has a flat second mating surface formed on one side B1. The other side B2 of the second block B forms the second end face of the housing 151. The first block A and the second block B are connected in a state in which the first mating surface (one side A1) and the second mating surface (one side B1) are in contact.

[0047] The first block A includes at least one or more slide valves S (first slide valves). The slide valves S are arranged with their longitudinal directions along the surface of one surface A1. The multiple slide valves S are arranged in parallel with their longitudinal directions along the surface of one surface A1, forming a slide valve group (first slide valve group).

[0048] The spool valve S comprises a freely movable spool S1 and a hydraulic chamber S6 that controls the movement of the spool S1. The spool S1 is formed in a roughly cylindrical shape. Multiple grooves S2 to S5 are formed circumferentially within the spool S1, serving as passages for the hydraulic oil. A spring S7 is provided within the hydraulic chamber S6. The longitudinal movement of the spool S1 is controlled by the pressure in the hydraulic chamber S6 overcoming the force of the spring S7.

[0049] A plurality of spool holes H (first spool holes) are formed adjacent to each other in the first block A for securing a plurality of spool valves S. The spool holes H have a circular cross-section. A spool S1 is inserted into the spool holes H. The spool holes H accommodate the spool S1 so that it can move freely. The spool holes H are arranged so that their longitudinal directions extend along the surface of one surface A1.

[0050] Multiple spool holes H are arranged in parallel with their longitudinal directions along the plane A1, forming a spool hole group (first spool hole group). Connected to the spool holes H are multiple passages H1 to H7 for hydraulic oil, which can be switched by the spool S1. Passages H1 and H7 serve as ports of an actuator, for example.

[0051] The first block A is formed with a plurality of through-holes K that penetrate both the other surface A2 and the one surface A1 when viewed from above. The through-holes K are formed within the outline of the first block A when viewed from above. The through-holes K have a circular cross-section. The through-holes K are formed so as to extend perpendicularly to the spool hole H when viewed from the direction along the one surface A1. The through-holes K may be formed not only perpendicularly to the spool hole H but also obliquely when viewed from the direction along the one surface A1.

[0052] The through hole K includes a first through hole K1 extending from the other surface A2 to the spool hole H in a direction perpendicular to the spool hole H, and a second through hole K2 extending from the spool hole H to the one surface A1 in a direction perpendicular to the spool hole H. The first through hole K1 and the second through hole K2 are formed concentrically in a plan view.

[0053] The first through-hole K1 is formed from the other side A2 to the valve stem hole H. The second through-hole K2 is formed from the valve stem hole H to the side of the first side A1. The diameter of the first through-hole K1 is formed to a size that allows the bolt C to pass through. A cover P is attached to the other side A2 of the first through-hole K1 to seal the first through-hole K1. The cover P has a protrusion P1 that seals the opening of the first through-hole K1. The protrusion P1 of the cover P can be screwed in or inserted. The bolt C is inserted through the first through-hole K1. The bolt C passes through the first through-hole K1 and reaches the second through-hole K2.

[0054] The second through-hole K2 is formed inside the first block A. The second through-hole K2 includes a hole with a larger diameter and a hole with a smaller diameter. The larger hole has the same diameter as the first through-hole K1. The smaller hole has the diameter of the threaded hole for the bolt C. A stepped support surface K3 is formed at the portion where the larger and smaller holes connect. The stepped support surface K3 is formed so that its diameter increases on the side facing the valve stem hole H. The support surface K3 supports the head C2 of the connecting bolt C. The support surface K3 is located closer to the side A1 than the valve stem hole H. By forming a portion of the valve stem hole H as a through-hole through which the bolt C passes, the shape of the valve stem hole H is not deformed, thereby improving the fit between the first block A and the second block B. The bolt C is, for example, a hexagonal socket head bolt (head bolt) having a hexagonal hole formed in the head C2.

[0055] In the first block A, a support surface K3 is formed in a stepped shape between the spool hole H and the surface A1 in the second through-hole K2. The bolt C may also be a tapered bolt with a tapered contact surface at its head. The support surface K3 may not only be stepped, but may also be tapered to match the tapered bolt.

[0056] As will be discussed later, the second through-hole K2 is formed to have a diameter slightly larger than that of the threaded portion C1 of the bolt C. The support surface K3 is formed to have a diameter larger than that of the head C2 of the bolt C. Within the first block A, the distance between the support surface K3 and the one surface A1 is shorter than the distance between the spool hole H and the one surface A1. In other words, the support surface K3 is formed closer to the one surface A1 than the spool hole H.

[0057] The bolt C inserted from the first through-hole K1 is inserted into the second through-hole K2. The bolt C is screwed into a bolt hole D (described later) formed in the second block B. When the bolt C is screwed in, the head C2 of the bolt C contacts the support surface K3.

[0058] The second block B includes at least one or more slide valves T (second slide valves). The slide valves T are arranged with their longitudinal directions along the surface of one surface B1. The multiple slide valves T are arranged in parallel with their longitudinal directions along the surface of one surface B1, forming a slide valve group (second slide valve group).

[0059] The spool valve T includes a freely movable spool T1 and a hydraulic chamber T6 that controls the movement of the spool T1. The spool T1 is formed in a roughly cylindrical shape. Multiple grooves T2 to T5 are formed circumferentially on the spool T1, serving as passages for the hydraulic oil. A spring T7 is installed in the hydraulic chamber T6. The longitudinal movement of the spool T1 is controlled by the pressure in the hydraulic chamber T6 overcoming the force of the spring T7.

[0060] The second block B has a plurality of adjacent spool holes I (second spool holes) for securing a plurality of spool valves T. The spool holes I have a circular cross-section. A spool T1 is inserted into the spool holes I. The spool holes I accommodate the spool T1 so that it can move freely. The spool holes I are arranged so that their longitudinal directions extend along the surface of one surface B1.

[0061] Multiple spool holes I are arranged in parallel with their longitudinal directions along the plane B1, forming a spool hole group (a second spool hole group). Connected to the spool holes I are multiple passages I1 to I6 for hydraulic oil, which can be switched by the spool T1. Passages I1 and I6 serve as ports of an actuator, for example.

[0062] The second block B has a bolt hole D formed on one side B1 when viewed from above. The bolt hole D is formed in an area closer to the inside of the second block B when viewed from above. The bolt hole D has a circular cross-section. The bolt hole D has an internal thread that is threadedly engaged with the threaded portion C1 of the bolt C. The bolt hole D is formed in a direction perpendicular to the valve stem hole I when viewed from a direction along the one side B1. The bolt hole D can be formed not only in a direction perpendicular to the valve stem hole I, but also obliquely when viewed from a direction along the one side B1. The bolt hole D does not penetrate the valve stem hole I. The bolt hole D is formed on the one side B1 at a position corresponding to the second through hole K2 formed on the one side A1. When viewed from above, the bolt hole D and the second through hole K2 are formed concentrically.

[0063] Inside the second block B, the distance between the bolt hole D and one surface B1 is shorter than the distance between the spool hole I and one surface B1. In other words, the bolt hole D is closer to one surface B1 than the spool hole I. An annular groove D1 is formed around the bolt hole D on one surface B1. An elastic member G, such as an O-ring, is mounted in groove D1 to prevent oil leakage and improve airtightness. With this structure, the second through-hole K2 communicates with the first through-hole K1 and reaches the bolt hole D.

[0064] According to the above structure, when connecting the first block A and the second block B, the spool valves S and T are not inserted into the valve stem holes H and I. A valve stem may also be provided in the valve stem hole I. The first block A and the second block B are arranged in a superimposed state with the other surface A2 of the first block A serving as the upper surface. A bolt C is inserted from the opening of the first through-hole K1 formed on the other surface A2 of the first block A. The bolt C is lowered into 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 abuts against the opening of the bolt hole D of the second block B. A hexagonal wrench or the like is used through the first through-hole K1 to engage the hexagonal hole formed in the head C2 of the bolt C.

[0065] When the hexagonal wrench is rotated, the threaded portion C1 of the bolt C is screwed into the bolt hole D. As the bolt C is screwed in, when the lower end of the head C2 contacts the support surface K3, the bolt C is tightened with a specified torque. As a result, one side A1 and one side B1 are in close contact. The elastic member G arranged around the bolt hole D is deformed and in close contact at one side B1, thereby improving the sealing around the bolt C. In this state, the bolt C applies force in the direction of making the first block A and the second block B close together with respect to the mating surfaces (one side A1 and one side B1).

[0066] In this state, the bolt C is disposed between the spool hole H formed in the first block A and the spool hole I formed in the second block B. Therefore, deformation due to tightening of the bolt C is unlikely to occur. The through hole K and the bolt hole D are provided in the tank passage U (see FIG. 1 ) with a relatively low pressure inside the housing 151. Figure 2 and Figure 3 ) and other areas nearby. Bolts C fasten the first block A and the second block B inside the housing 151.

[0067] The through-hole K and bolt hole D are not limited to the positions described above and may be formed elsewhere. They may also be located in areas where the deflection force between the first block A and the second block B is high, potentially causing oil leakage. After the bolt C is tightened, the opening of the second through-hole K2 is sealed with a cap P.

[0068] [Modification]

[0069] A modified example of the hydraulic control valve device 150 will be described below. In the following description, components identical to those of the aforementioned embodiment will be assigned the same names and reference numerals, and duplicate descriptions will be omitted as appropriate. In the aforementioned embodiment, the first through-hole K1 formed in the first block A is sealed with a cap P. However, the first through-hole K1 can also be used for other purposes.

[0070] like Figure 6 As shown, the first through-hole K1 can also be used as a passage for circulating hydraulic oil. The first through-hole K1 can also be used, for example, as a connection port for a passage for operating an actuator. The first through-hole K1 is used, for example, as a passage for hydraulic oil for an actuator that can be switched by a spool (not shown) of a spool valve S. A passage connection member F is attached to the opening of the first through-hole K1 formed on the other surface A2.

[0071] like Figure 7 As shown, the first through hole K1 can also be used as a passage for hydraulic oil to operate a relief valve that adjusts the pressure of the hydraulic oil. A relief valve 300 is mounted at the opening of the first through hole K1 formed on the other surface A2. A passage K4 for the hydraulic oil released from the relief valve 300 is formed in the first through hole K1.

[0072] As described above, according to the hydraulic control valve device 150, the supporting surface and bolt hole D of the bolt C for connecting the first block A and the second block B are formed inside the first block A and the second block B. Therefore, there is no need to ensure additional space around the end face of the first block A for the supporting surface of the bolt C, and the device structure can be miniaturized.

[0073] The supporting surface of the bolt C and the bolt hole D are formed between the valve stem hole H formed in the first block A and the valve stem hole I formed in the second block B. Therefore, even if the bolt C is tightened, the valve stem holes H and I will not be deformed, and the first block A and the second block B can be tightly fitted.

[0074] Furthermore, the present invention is not limited to the above-described embodiments and encompasses various modifications to the above-described embodiments without departing from the spirit of the present invention. For example, the hydraulic control valve assembly may be constructed by connecting two or more blocks. The hydraulic control valve assembly may also utilize studs and nuts in place of the bolts C. Furthermore, the hydraulic system 1 may be applied not only to construction machinery but also to other devices utilizing a working fluid, such as hydraulic presses.

[0075] Industrial applicability

[0076] According to the present invention, it is possible to provide a fluid pressure control valve device and a fluid pressure system including a housing capable of improving the close fit between blocks without deforming the shape of a spool hole.

Claims

1. A fluid pressure control valve device, wherein: The fluid pressure control valve device comprises: a first block having a first spool hole for accommodating a first spool valve formed between a first end face and a first mating face, a first through-hole for passing a fastening bolt through formed in the first spool hole on the first end face side, a second through-hole for a bolt hole formed in the first spool hole on the first mating face side concentrically with the first through-hole, and a support surface for the bolt formed in the second through-hole; and The second block has a second valve stem hole for accommodating a second slide valve formed between the second end surface and the second mating surface, and a threaded hole for screwing the bolt into is formed on the second mating surface side at a position corresponding to the first through hole.

2. The fluid pressure control valve device according to claim 1, wherein: At least one of the first through hole, the second through hole, and the screw hole is formed in a low-pressure region inside the first block and the second block.

3. The fluid pressure control valve device according to claim 1 or 2, wherein: The fluid pressure control valve device includes a cover having a convex portion that closes the first through hole.

4. The fluid pressure control valve device according to claim 1 or 2, wherein: The first through hole is formed as a passage for hydraulic oil of an actuator connected to the first spool valve.

5. The fluid pressure control valve device according to claim 1 or 2, wherein: The first through hole is formed as a passage for hydraulic oil of a relief valve connected to the first spool valve.

6. A fluid pressure control valve device, wherein: The fluid pressure control valve device comprises: The first block has a first spool hole for accommodating a first spool valve formed between a first end surface and a first mating surface, at least one first through-hole for passing a fastening bolt is formed in the first spool hole on the first end surface side, and a second through-hole for a bolt is formed in the first spool hole on the first mating surface side concentrically with the first through-hole, wherein a support surface for the bolt is formed in the second through-hole; The second block has a second valve stem hole for accommodating a second slide valve formed between the second end surface and the second mating surface, and at least one threaded hole for screwing the bolt into is formed on the second mating surface side at a position corresponding to the first through hole; as well as a cover having a convex portion for closing the first through hole, The first through hole, the second through hole, and the screw hole are formed in a relatively low-pressure region inside the first block and the second block.

7. A fluid pressure control valve device, wherein: The fluid pressure control valve device comprises: a first block having a first spool hole for accommodating a first spool valve formed between a first end face and a first mating face, at least one first through-hole for passing a fastening bolt through formed in the first spool hole on the first end face side, and a second through-hole for a bolt hole formed in the first spool hole on the first mating face side concentrically with the first through-hole, wherein a support surface for the bolt is formed in the second through-hole; and The second block has a second valve stem hole for accommodating the second slide valve formed between the second end surface and the second mating surface, and at least one threaded hole for screwing the bolt is formed on the second mating surface side at a position corresponding to the first through hole. The first through hole is formed as a passage for the hydraulic oil of the actuator connected to the first spool valve. The first through hole, the second through hole, and the screw hole are formed in a relatively low-pressure region inside the first block and the second block.

8. A fluid pressure control valve device, wherein: The fluid pressure control valve device comprises: a first block having a first spool hole for accommodating a first spool valve formed between a first end face and a first mating face, at least one first through-hole for passing a fastening bolt through formed in the first spool hole on the first end face side, and a second through-hole for a bolt hole formed in the first spool hole on the first mating face side concentrically with the first through-hole, wherein a support surface for the bolt is formed in the second through-hole; and The second block has a second valve stem hole for accommodating the second slide valve formed between the second end surface and the second mating surface, and at least one threaded hole for screwing the bolt is formed on the second mating surface side at a position corresponding to the first through hole. The first through hole is formed as a passage for the hydraulic oil of the relief valve connected to the first slide valve. The first through hole, the second through hole, and the screw hole are formed in a relatively low-pressure region inside the first block and the second block.

9. A fluid pressure system, wherein: The fluid pressure system has: a fluid pressure pump that generates fluid pressure using a working fluid; an actuator driven by the working fluid supplied from the fluid pressure pump; and a fluid pressure control valve device that switches the output destination of the working fluid, The fluid pressure control valve device comprises: a first block having a first spool hole for accommodating a first spool valve formed between a first end face and a first mating face, a first through-hole for passing a fastening bolt through formed in the first spool hole on the first end face side, a second through-hole for a bolt hole formed in the first spool hole on the first mating face side concentrically with the first through-hole, and a support surface for the bolt formed in the second through-hole; and The second block has a second valve stem hole for accommodating a second slide valve formed between the second end surface and the second mating surface, and a threaded hole for screwing the bolt into is formed on the second mating surface side at a position corresponding to the first through hole.

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