阅读说明：本技术 流体压控制阀装置和流体压系统 (Fluid pressure control valve device and fluid pressure system ) 是由 小林正幸 于 2021-03-30 设计创作，主要内容包括：本发明提供一种流体压控制阀装置和流体压系统。本发明是一种流体压控制阀装置,其具备：第1块,其在第1端面与第1对合面之间形成有收容第1滑阀的第1阀柱孔,在所述第1端面侧在所述第1阀柱孔形成有供紧固用的螺栓穿过的第1贯通孔,在所述第1对合面侧以与所述第1贯通孔同心的方式在所述第1阀柱孔形成有螺栓孔用的第2贯通孔,在该螺栓孔用的第2贯通孔形成有所述螺栓的支承面；以及第2块,其在第2端面与第2对合面之间形成有收容第2滑阀的第2阀柱孔,在所述第2对合面侧,在与所述第1贯通孔相对应的位置形成有供所述螺栓拧入的螺纹孔。(The invention provides a fluid pressure control valve device and a fluid pressure system. The present invention is a fluid pressure control valve device including: a 1 st block having a 1 st spool hole for accommodating a 1 st spool formed between a 1 st end surface and a 1 st mating surface, a 1 st through hole for passing a fastening bolt formed in the 1 st spool hole on the 1 st end surface side, a 2 nd through hole for a bolt hole formed in the 1 st spool hole on the 1 st mating surface side so as to be concentric with the 1 st through hole, and a support surface for the bolt formed in the 2 nd through hole for the bolt hole; and a 2 nd block having a 2 nd spool hole for accommodating the 2 nd spool formed between a 2 nd end surface and a 2 nd mating surface, and having a screw hole into which the bolt is screwed formed at a position corresponding to the 1 st through hole on the 2 nd mating surface side.)

1. A fluid pressure control valve device, wherein,

the fluid pressure control valve device includes:

a 1 st block having a 1 st spool hole for accommodating a 1 st spool formed between a 1 st end surface and a 1 st mating surface, a 1 st through hole for passing a fastening bolt formed in the 1 st spool hole on the 1 st end surface side, a 2 nd through hole for a bolt hole formed in the 1 st spool hole on the 1 st mating surface side so as to be concentric with the 1 st through hole, and a support surface for the bolt formed in the 2 nd through hole for the bolt hole; and

and a 2 nd block having a 2 nd spool hole for accommodating the 2 nd spool formed between a 2 nd end surface and a 2 nd mating surface, and having a screw hole into which the bolt is screwed formed at a position corresponding to the 1 st through hole on the 2 nd mating surface side.

2. The fluid pressure control valve arrangement of claim 1,

the 1 st through hole, the 2 nd through hole, and the screw hole are formed in at least one region where the pressure inside the 1 st block and the 2 nd block is low.

3. Fluid pressure control valve arrangement according to claim 1 or 2,

the fluid pressure control valve device includes a cover having a convex portion for closing the 1 st through hole.

4. Fluid pressure control valve arrangement according to claim 1 or 2,

the 1 st through hole is formed as a passage for hydraulic oil of an actuator connected to the 1 st spool.

5. Fluid pressure control valve arrangement according to claim 1 or 2,

the 1 st through hole is formed as a passage for hydraulic oil of a relief valve connected to the 1 st spool.

6. A fluid pressure control valve device, wherein,

the fluid pressure control valve device includes:

a 1 st block having a 1 st spool hole for accommodating a 1 st spool formed between a 1 st end surface and a 1 st mating surface, at least one or more 1 st through-holes for passing bolts for fastening formed in the 1 st spool hole on the 1 st end surface side, a 2 nd through-hole for a bolt hole formed in the 1 st spool hole on the 1 st mating surface side so as to be concentric with the 1 st through-hole, and a support surface for the bolt hole formed in the 2 nd through-hole for the bolt hole;

a 2 nd block having a 2 nd spool hole for accommodating a 2 nd spool formed between a 2 nd end surface and a 2 nd mating surface, at least one or more screw holes into which the bolts are screwed being formed at positions corresponding to the 1 st through-holes on the 2 nd mating surface side; and

A lid having a convex portion for closing the 1 st through hole,

the 1 st through hole, the 2 nd through hole, and the screw hole are formed in a region where pressure is low in the 1 st block and the 2 nd block.

7. A fluid pressure control valve device, wherein,

the fluid pressure control valve device includes:

a 1 st block having a 1 st spool hole for accommodating a 1 st spool formed between a 1 st end surface and a 1 st mating surface, at least one or more 1 st through-holes for passing bolts for fastening formed in the 1 st spool hole on the 1 st end surface side, a 2 nd through-hole for a bolt hole formed in the 1 st spool hole on the 1 st mating surface side so as to be concentric with the 1 st through-hole, and a support surface for the bolt hole formed in the 2 nd through-hole for the bolt hole; and

a 2 nd block having a 2 nd spool hole for accommodating a 2 nd spool formed between a 2 nd end surface and a 2 nd mating surface, at least one or more screw holes into which the bolts are screwed being formed at positions corresponding to the 1 st through-holes on the 2 nd mating surface side,

the 1 st through hole is formed as a passage for hydraulic oil of an actuator connected to the 1 st spool,

the 1 st through hole, the 2 nd through hole, and the screw hole are formed in a region where pressure is low in the 1 st block and the 2 nd block.

8. A fluid pressure control valve device, wherein,

the fluid pressure control valve device includes:

a 1 st block having a 1 st spool hole for accommodating a 1 st spool formed between a 1 st end surface and a 1 st mating surface, at least one or more 1 st through-holes for passing bolts for fastening formed in the 1 st spool hole on the 1 st end surface side, a 2 nd through-hole for a bolt hole formed in the 1 st spool hole on the 1 st mating surface side so as to be concentric with the 1 st through-hole, and a support surface for the bolt hole formed in the 2 nd through-hole for the bolt hole; and

a 2 nd block having a 2 nd spool hole for accommodating a 2 nd spool formed between a 2 nd end surface and a 2 nd mating surface, at least one or more screw holes into which the bolts are screwed being formed at positions corresponding to the 1 st through-holes on the 2 nd mating surface side,

the 1 st through hole is formed as a passage for working oil of a relief valve connected to the 1 st spool,

the 1 st through hole, the 2 nd through hole, and the screw hole are formed in a region where pressure is low in the 1 st block and the 2 nd block.

9. A fluid pressure system in which, in a fluid pressure system,

the fluid pressure system includes:

a fluid pressure pump that generates fluid pressure using a working fluid;

An actuator driven by the working fluid fed from the fluid pressure pump; and

a fluid pressure control valve device that switches an output target of the working fluid,

the fluid pressure control valve device includes:

a 1 st block having a 1 st spool hole for accommodating a 1 st spool formed between a 1 st end surface and a 1 st mating surface, a 1 st through hole for passing a fastening bolt formed in the 1 st spool hole on the 1 st end surface side, a 2 nd through hole for a bolt hole formed in the 1 st spool hole on the 1 st mating surface side so as to be concentric with the 1 st through hole, and a support surface for the bolt formed in the 2 nd through hole for the bolt hole; and

and a 2 nd block having a 2 nd spool hole for accommodating the 2 nd spool formed between a 2 nd end surface and a 2 nd mating surface, and having a screw hole into which the bolt is screwed formed at a position corresponding to the 1 st through hole on the 2 nd mating surface side.

Technical Field

The present invention relates to a fluid pressure control valve device and a fluid pressure system including a plurality of spool valves.

Background

A casing of a hydraulic control valve device that controls hydraulic pressure of a hydraulic excavator is configured by connecting a plurality of blocks. The block is provided with a plurality of spool valves (directional switching valves) for switching the direction of the hydraulic oil. The blocks are combined in a plurality of rows to constitute a hydraulic control valve device. The blocks provided with a plurality of slide valves are mutually fastened, for example, by a plurality of bolts. The plurality of bolts are arranged along the outer periphery of the end surface of the housing formed by connecting the plurality of blocks.

In some cases, a passage for a hydraulic circuit for circulating the hydraulic oil to the blocks may be formed in the casing at the mating surface between the blocks. In recent years, as the hydraulic pressure increases, it is necessary to increase the adhesion force of the mating surfaces in order to improve the sealing property of the passages formed in the mating surfaces. In order to improve the adhesion force, it is conceivable to increase the number of bolts for fastening the blocks to each other. In a configuration in which a plurality of bolts are arranged on the outer periphery of the housing, if the adhesion force between the blocks is increased, the housing is increased in size to secure a space for the bolts. Further, since the fitting degree of the fitting surface is low in the region inward of the periphery of the housing, a space for installing a bolt is also required in this region.

Patent document 1 describes a case in which a plurality of blocks are fastened to each other using a plurality of bolts. A plurality of slide valves are provided in a block constituting the housing. A plurality of spool holes for inserting spool valves are formed in the block. The holes are formed in the direction of the mating faces of the blocks. The plurality of blocks are fastened by a plurality of fastening bolts provided in a direction orthogonal to the mating surface, thereby constituting a housing. The plurality of bolts are provided along the peripheries of both end surfaces of the housing. The bolts are also provided at positions between the plurality of stem holes on both end surfaces.

Documents of the prior art

Patent document

Patent document 1: japanese patent application laid-open publication No. 2011-112123

Disclosure of Invention

Problems to be solved by the invention

In the case described in patent document 1, if the fastening force of the bolt is increased in order to increase the adhesion force of the mating surfaces of the blocks, the blocks may be compressed by the bolt and deformed in the spool hole. Therefore, in the case where the fastening force of the bolt is increased in the housing, it is necessary to form the spool hole to be larger so that the clearance between the spool hole and the spool is increased.

The present invention aims to provide a hydraulic control valve device and a construction machine having a housing that can improve the degree of sealing between blocks without deforming the shape of a valve post hole.

Means for solving the problems

[1] A fluid pressure control valve device according to an aspect of the present invention includes: a 1 st block having a 1 st spool hole for accommodating a 1 st spool formed between a 1 st end surface and a 1 st mating surface, a 1 st through hole for passing a fastening bolt formed in the 1 st spool hole on the 1 st end surface side, a 2 nd through hole for a bolt hole formed in the 1 st spool hole on the 1 st mating surface side so as to be concentric with the 1 st through hole, and a support surface for the bolt formed in the 2 nd through hole for the bolt hole; and a 2 nd block having a 2 nd spool hole for accommodating the 2 nd spool formed between a 2 nd end surface and a 2 nd mating surface, and having a screw hole into which the bolt is screwed formed at a position corresponding to the 1 st through hole on the 2 nd mating surface side.

With this configuration, the 2 nd through hole and the screw hole are formed on the facing surface side as compared with the 1 st stem hole and the 2 nd stem hole. Therefore, when the 1 st block and the 2 nd block are coupled by inserting a bolt through the bolt hole formed in the 2 nd through-hole and screwing the bolt into the screw hole, the 1 st spool hole and the 2 nd spool hole are not deformed. Since the 2 nd through hole is formed to penetrate the 1 st stem hole, the adhesion of the mating surface can be improved when the bolt is screwed in.

[2] According to the structure described in the above [1], at least one or more of the 1 st through hole, the 2 nd through hole, and the screw hole may be formed in a region where the pressure inside the 1 st block and the 2 nd block is low.

[3] According to the above-described configuration of [1] or [2], the fluid pressure control valve device may include a cover having a convex portion for closing the 1 st through hole.

[4] According to the above-described configuration of [1] or [2], the 1 st through hole may be formed as a passage of hydraulic oil of an actuator connected to the 1 st spool.

[5] According to the above-described configuration of [1] or [2], the 1 st through hole may be formed as a passage of hydraulic oil of a relief valve connected to the 1 st spool.

[6] A fluid pressure control valve device according to an aspect of the present invention includes: a 1 st block having a 1 st spool hole for accommodating a 1 st spool formed between a 1 st end surface and a 1 st mating surface, at least one or more 1 st through-holes for passing bolts for fastening formed in the 1 st spool hole on the 1 st end surface side, a 2 nd through-hole for a bolt hole formed in the 1 st spool hole on the 1 st mating surface side so as to be concentric with the 1 st through-hole, and a support surface for the bolt hole formed in the 2 nd through-hole for the bolt hole; a 2 nd block having a 2 nd spool hole for accommodating a 2 nd spool formed between a 2 nd end surface and a 2 nd mating surface, at least one or more screw holes into which the bolts are screwed being formed at positions corresponding to the 1 st through-holes on the 2 nd mating surface side; and a cover having a convex portion for closing the 1 st through hole, wherein the 1 st through hole, the 2 nd through hole, and the screw hole are formed in a region of low pressure in the 1 st block and the 2 nd block.

[7] A fluid pressure control valve device according to an aspect of the present invention includes: a 1 st block having a 1 st spool hole for accommodating a 1 st spool formed between a 1 st end surface and a 1 st mating surface, at least one or more 1 st through-holes for passing bolts for fastening formed in the 1 st spool hole on the 1 st end surface side, a 2 nd through-hole for a bolt hole formed in the 1 st spool hole on the 1 st mating surface side so as to be concentric with the 1 st through-hole, and a support surface for the bolt hole formed in the 2 nd through-hole for the bolt hole; and a 2 nd block having a 2 nd spool hole for accommodating a 2 nd spool formed between a 2 nd end surface and a 2 nd mating surface, at least one or more screw holes into which the bolt is screwed being formed at a position corresponding to the 1 st through hole on the 2 nd mating surface side, the 1 st through hole forming a passage for hydraulic oil of an actuator connected to the 1 st spool, the 1 st through hole, the 2 nd through hole, and the screw holes being formed in a region where pressure is low in the 1 st block and the 2 nd block.

[8] A fluid pressure control valve device according to an aspect of the present invention includes: a 1 st block having a 1 st spool hole for accommodating a 1 st spool formed between a 1 st end surface and a 1 st mating surface, at least one or more 1 st through-holes for passing bolts for fastening formed in the 1 st spool hole on the 1 st end surface side, a 2 nd through-hole for a bolt hole formed in the 1 st spool hole on the 1 st mating surface side so as to be concentric with the 1 st through-hole, and a support surface for the bolt hole formed in the 2 nd through-hole for the bolt hole; and a 2 nd block having a 2 nd spool hole for accommodating a 2 nd spool formed between a 2 nd end surface and a 2 nd mating surface, at least one or more screw holes into which the bolts are screwed being formed at positions corresponding to the 1 st through hole on the 2 nd mating surface side, the 1 st through hole forming a passage for hydraulic oil of a relief valve connected to the 1 st spool, the 1 st through hole, the 2 nd through hole, and the screw holes being formed in a region where pressure is low in the 1 st block and the 2 nd block.

[9] A fluid pressure system according to an aspect of the present invention includes: a fluid pressure pump that generates fluid pressure using a working fluid; an actuator driven by the working fluid fed from the fluid pressure pump; and a fluid pressure control valve device that switches an output target of the working fluid, the fluid pressure control valve device including: a 1 st block having a 1 st spool hole for accommodating a 1 st spool formed between a 1 st end surface and a 1 st mating surface, a 1 st through hole for passing a fastening bolt formed in the 1 st spool hole on the 1 st end surface side, a 2 nd through hole for a bolt hole formed in the 1 st spool hole on the 1 st mating surface side so as to be concentric with the 1 st through hole, and a support surface for the bolt formed in the 2 nd through hole for the bolt hole; and a 2 nd block having a 2 nd spool hole for accommodating the 2 nd spool formed between a 2 nd end surface and a 2 nd mating surface, and having a screw hole into which the bolt is screwed formed at a position corresponding to the 1 st through hole on the 2 nd mating surface side.

ADVANTAGEOUS EFFECTS OF INVENTION

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 degree of contact between blocks without deforming the shape of a spool hole.

Drawings

Fig. 1 is a schematic configuration diagram of a construction machine according to an embodiment of the present invention.

Fig. 2 is a structural diagram of a hydraulic system of an embodiment of the present invention.

Fig. 3 is a diagram showing a hydraulic circuit of a hydraulic control valve device according to an embodiment of the present invention.

Fig. 4 is a sectional view showing the structure of a hydraulic control valve device according to an embodiment of the present invention.

Fig. 5 is a plan view showing the structure of a hydraulic control valve device according to an embodiment of the present invention.

Fig. 6 is a diagram showing the configuration of a hydraulic control valve device according to a modification of the embodiment of the present invention.

Fig. 7 is a diagram showing the configuration of a hydraulic control valve device according to another modification of the embodiment of the present invention.

Description of the reference numerals

1. A hydraulic system; 100. a construction machine; 101. a revolving body; 102. a traveling body; 103. a cab; 104. a movable arm; 105. a bucket rod; 106. a bucket; 120. an engine; 121. an output shaft; 130. a hydraulic pump; 140. an actuator; 150. a hydraulic control valve device; 151. a housing; 160. a tank; 300. an overflow valve; A. block 1; a1, one face (1 st mating face); a2, the other side; B. a2 nd block; b1, one face (No. 2 mating face); b2 and the other side; C. a bolt; c1, a threaded portion; c2, head; D. bolt holes; d1, groove; F. a connecting member; G. an elastic member; H. a spool bore (1 st spool bore); H1-H7, a channel; I. a valve post bore; I1-I6, a channel; K. a through hole; k1, 1 st through hole; k2, 2 nd through hole; k3, bearing surface; k4, pathway; m, a bolt; p, a cover; p1, convex; q, a path; s, a slide valve; s1, a valve stem; S2-S5; s7, a spring; t, a slide valve; t1, spool; T2-T5, groove; t6, hydraulic chamber; t7, spring; u, tank passage.

Detailed Description

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

(construction machine)

As shown in fig. 1, the construction machine 100 is, for example, a hydraulic excavator. The construction machine 100 includes a revolving structure 101 and a traveling structure 102. Revolving unit 101 is provided on traveling unit 102 so as to be rotatable. The revolving structure 101 is provided with a hydraulic system 1.

Rotator 101 includes: a cab 103 on which an operator can ride; a boom 104 having one end connected to the cab 103 so as to be swingable; an arm 105 having one end connected to the other end (distal end) of the boom 104 on the side opposite to the cab 103 so as to be swingable; and a bucket 106 connected to the other end (tip end) of arm 105 on the side opposite to boom 104 so as to be swingable. In addition, a hydraulic system 1 is provided in the cab 103. The cab 103, the boom 104, the arm 105, and the bucket 106 are driven by hydraulic oil supplied from the hydraulic system 1.

(Hydraulic System)

As shown in fig. 2, 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 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 storing working oil; and a relief valve 300 for pressure adjustment. In the present embodiment, the hydraulic pressure is exemplified as an example of the fluid pressure, but the working fluid may be not only the working oil but also another fluid. The fluid pressure system may be applied not only to a construction machine but also to other devices that control a plurality of actuators.

The engine 120 is an internal combustion engine using gasoline fuel or diesel fuel. The engine 120 includes an output shaft 121, and the output shaft 121 is coupled to the hydraulic pump 130. A passage Q is connected to hydraulic pump 130. The hydraulic pump 130 generates fluid pressure using the working fluid. The hydraulic pump 130 is driven by the output shaft 121 to circulate the hydraulic oil to the passage Q. The hydraulic oil supplied to the passage Q flows through the tank passage U and returns to the tank 160. A hydraulic control valve device 150 is connected to the passage Q.

The hydraulic control valve device 150 switches the output target of the working fluid. The hydraulic control valve device 150 is connected to the plurality of actuators 140 via the branched passages Q. In fig. 2, one actuator 140 is illustrated. The hydraulic control valve device 150 is provided in plural, and supplies the hydraulic oil to the actuators 140 by switching the hydraulic pressure of the hydraulic oil flowing through the passage Q by the plural valves. The plurality of actuators 140 drive the cab 103, the boom 104, the arm 105, the bucket 106, and the like. The relief valve 300 releases the pressure when the pressure of the flow path becomes equal to or higher than a predetermined value set in advance in the hydraulic circuit of the hydraulic system 1.

(Hydraulic control valve device)

As shown in fig. 3, the hydraulic control valve device 150 (fluid control valve device) includes a housing 151 formed by connecting a plurality of blocks. In the present embodiment, the case 151 is exemplified as a case including two rows of blocks. Mating surfaces (a surface a1, a surface B1) are formed on the contact surface between the 1 st block a and the 2 nd block B.

The 1 st block a includes a plurality of spools S. A passage Q from the hydraulic pump 130 is connected to the plurality of spools S, and a tank passage U to the tank 160 is connected thereto. The 2 nd block B includes a plurality of spools T. A passage Q from the hydraulic pump 130 is connected to the plurality of spools T, and a tank passage U to the tank 160 is connected thereto.

As shown in fig. 4 and 5, the housing 151 includes a1 st block a formed in a substantially rectangular parallelepiped shape and a2 nd block B formed in a substantially rectangular parallelepiped shape. Hereinafter, the view in the-z direction in the drawings is referred to as a plan view.

The 1 st block a and the 2 nd block B are coupled 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 1 st block a in a plan view, and are screwed and fixed to screw holes (not shown) formed along the periphery of the 2 nd block B at positions corresponding to the plurality of bolt holes. The bolt M is, for example, a hexagon socket head cap screw. The bolt M may be other kinds of bolts. In the 1 st block a, the support 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 as the mating surface from the other surface a 2. The 1 st block a and the 2 nd block B are further joined by a plurality of bolts C as discussed later.

The 1 st block a has a flat 1 st mating surface formed on the side of the one surface a 1. The other surface a2 of the 1 st block a is formed as the 1 st end surface of the housing 151. The 2 nd block B has a flat 2 nd fitting surface formed on the side of the surface B1. The second surface B2 of the 2 nd block B is the 2 nd end surface of the housing 151. The 1 st block A and the 2 nd block B are connected in a state where the 1 st mating surface (surface A1) and the 2 nd mating surface (surface B1) are in contact with each other.

The 1 st block a includes at least one or more spool S (1 st spool). The spool S is disposed so that its longitudinal direction is along the plane direction of the plane a 1. The plurality of spools S are arranged in parallel so that the longitudinal direction thereof is along the surface direction of the surface a1, and constitute a spool group (1 st spool group).

The spool S includes a spool S1 that can move freely and a hydraulic chamber S6 that controls the movement of the spool S1. The spool S1 is formed in a substantially cylindrical shape. The spool S1 has a plurality of grooves S2 to S5 formed in the circumferential direction as passages for the working oil. A spring S7 is provided in the hydraulic chamber S6, and the pressure of the hydraulic chamber S6 controls the longitudinal movement of the spool S1 against the force of the spring S7.

In the 1 st block a, a plurality of spool holes H (1 st spool hole) for fixing a plurality of spools S are formed in an adjacent manner. The stem hole H is formed in a circular section. A spool S1 is inserted into the spool hole H. The spool hole H accommodates the spool S1 to be movable. The stem hole H is disposed so that the longitudinal direction thereof is along the plane direction of the one surface a 1.

The plurality of stem holes H are arranged in parallel so that the longitudinal direction thereof is along the plane direction of the one surface a1, and constitute a stem hole group (1 st stem hole group). The spool hole H is connected to a plurality of passages H1 to H7 of the hydraulic oil switchable by the spool S1. The passages H1, H7 are, for example, ports of the actuator.

The 1 st block a has a plurality of through holes K penetrating the second surface a2 side and the first surface a1 side in a plan view. The through hole K is formed in a region within the outline of the 1 st block a in a plan view. The through hole K is formed in a circular cross section. The through hole K is formed so as to penetrate in a direction perpendicular to the spool hole H when viewed from a direction along the one surface a 1. The through hole K may be formed not only in the direction perpendicular to the spool hole H but also obliquely when viewed from the direction along the one surface a 1.

The through hole K includes a1 st through hole K1 penetrating from the other surface a2 to the spool hole H in the direction orthogonal to the spool hole H, and a2 nd through hole K2 penetrating from the spool hole H to the one surface a1 side in the direction orthogonal to the spool hole H. The 1 st through hole K1 and the 2 nd through hole K2 are formed concentrically in a plan view.

The 1 st through hole K1 is formed from the other surface a2 to the spool hole H. The 2 nd through hole K2 is formed from the stem hole H to the side of the face a 1. The 1 st through hole K1 has a diameter sized to pass the bolt C. The 1 st through hole K1 has a cover P attached to the other surface a2, and closes the 1 st through hole K1. The lid P has a convex portion P1 for closing the opening of the 1 st through hole K1. The protrusion P1 of the cap P may be screwed or embedded. The bolt C is inserted through the 1 st through hole K1. The bolt C passes through the 1 st through hole K1 to reach the 2 nd through hole K2.

The 2 nd through hole K2 is formed in the 1 st block a. The 2 nd through hole K2 has a hole with a larger diameter and a hole with a smaller diameter. The larger diameter hole is formed with the same diameter as that of the 1 st through hole K1. The smaller diameter hole is formed with the diameter of the threaded hole of the bolt C. A stepped bearing surface K3 is formed at a portion where the larger diameter hole and the smaller diameter hole are connected. The stepped bearing surface K3 is formed with an enlarged diameter on the side facing the stem hole H. The support surface K3 supports the head C2 of the fastening bolt C. The support surface K3 is provided on the side of the face a1 with respect to the spool hole H. By providing the column hole H with a through hole through which the bolt C is inserted, the fitting degree between the 1 st block a and the 2 nd block B can be improved without deforming the shape of the column hole H. The bolt C is, for example, a hexagon socket bolt (headed bolt) having a hexagonal hole formed in the head C2.

In the 1 st block a, the support surface K3 is formed in a stepped manner between the spool hole H and the surface a1 in the 2 nd through hole K2. The bolt C may be a tapered bolt having a tapered abutting surface of the head. The bearing surface K3 may be formed not only in a stepped shape but also in a tapered shape corresponding to the tapered bolt.

The 2 nd through hole K2 is formed with a diameter slightly larger than the diameter of the threaded portion C1 of the bolt C as discussed later. The bearing surface K3 is formed with a diameter larger than the diameter of the head C2 of the bolt C. In the 1 st block a, the distance between the support surface K3 and the surface a1 is shorter than the distance between the spool hole H and the surface a 1. That is, the support surface K3 is formed closer to the surface a1 than the spool hole H.

The bolt C inserted from the 1 st through hole K1 is inserted into the 2 nd through hole K2. The bolt C is screwed into a bolt hole D, discussed later, formed at the 2 nd block B. When the bolt C is screwed, the head C2 of the bolt C abuts against the support surface K3.

The 2 nd block B includes at least one or more spool valves T (2 nd spool valve). The spool T is disposed so that its longitudinal direction is along the plane direction of the plane B1. The plurality of spools T are arranged in parallel so that the longitudinal direction thereof is along the surface direction of the surface B1, and constitute a spool group (2 nd spool group).

The spool T includes a spool T1 that can move freely and a hydraulic chamber T6 that controls the movement of the spool T1. The spool T1 is formed in a substantially cylindrical shape. The spool T1 has a plurality of grooves T2 to T5 formed in the circumferential direction as passages for the working oil. A spring T7 is provided in the hydraulic chamber T6, and the pressure in the hydraulic chamber T6 controls the longitudinal movement of the spool T1 against the force of the spring T7.

A plurality of spool holes I (2 nd spool holes) for fixing a plurality of spools T are formed in the 2 nd block B in an adjacent manner. The spool hole I is formed in a circular cross section. A spool T1 is inserted into the spool hole I. The spool hole I accommodates the spool T1 to be movable. The stem hole I is disposed so that the longitudinal direction thereof is along the plane direction of the plane B1.

The plurality of spool holes I are arranged in parallel so that the longitudinal direction thereof is along the surface direction of the one surface B1, and constitute a spool hole group (2 nd spool hole group). A plurality of passages I1 to I6 of the hydraulic oil switchable by the spool T1 are connected to the spool hole I. The passages I1, I6 are, for example, ports of the actuator.

The 2 nd block B has a bolt hole D formed on the side of the face B1 in plan view. The bolt hole D is formed in an area inward of the periphery of the 2 nd block B in plan view. The bolt hole D is formed in a circular cross section. The bolt hole D is formed with an internal thread that is screwed with the threaded portion C1 of the bolt C. The bolt hole D is formed in the orthogonal direction to the spool hole I when viewed from the direction along the face B1. The bolt hole D may be formed not only in the direction orthogonal to the spool hole I but also obliquely when viewed from the direction along the face B1. The bolt hole D does not penetrate through the valve column hole I. The bolt hole D is formed in the face B1 at a position corresponding to the 2 nd through hole K2 formed in the face a 1. The bolt hole D and the 2 nd through hole K2 are formed concentrically in a plan view.

In the interior of the 2 nd block B, the distance between the bolt hole D and the face B1 is formed shorter than the distance between the spool hole I and the face B1. That is, the bolt hole D is formed closer to the one surface B1 than the spool hole I. On the surface B1, an annular groove D1 is formed around the bolt hole D. An elastic member G such as an O-ring for preventing oil leakage and improving sealing performance is attached to the groove D1. According to the above configuration, the 2 nd through hole K2 and the 1 st through hole K1 communicate with each other and reach the bolt hole D.

According to the above configuration, when the 1 st block a and the 2 nd block B are coupled, the spool S, T is not inserted into the spool hole H, I. A spool may also be present in the spool bore I. The 1 st block a and the 2 nd block B are disposed in a state where they are overlapped with each other such that the other surface a2 of the 1 st block a becomes an upper surface. The bolt C is inserted from the opening of the 1 st through hole K1 formed on the other surface a2 side of the 1 st block a. The bolt C is dropped into the 1 st through hole K1, and the screw portion C1 is inserted into the 2 nd through hole K2. The lower end of the threaded portion C1 abuts the opening of the bolt hole D of the 2 nd block B. From the 1 st through hole K1, a hexagonal wrench or the like is used to engage the hexagonal hole formed in the head C2 of the bolt C.

When the allen wrench is rotated, the threaded portion C1 of the bolt C is screwed into the bolt hole D. When the lower end of the head C2 abuts against the support surface K3 as the bolt C is screwed in, the bolt C is fastened at a predetermined torque. Thus, the face a1 and the face B1 are in close contact with each other. The elastic member G disposed around the bolt hole D is deformed and closely attached to the surface B1, and the sealing performance around the bolt C is improved. In this state, the bolt C is biased in a direction in which the 1 st block a and the 2 nd block B are closely contacted with the mating surfaces (the surface a1 and the surface B1) therebetween.

In this state, the bolt C is disposed between the spool hole H formed in the 1 st block a and the spool hole I formed in the 2 nd block B, and therefore, deformation due to fastening of the bolt C is less likely to occur. The through hole K and the bolt hole D are provided in a region such as a vicinity of a tank passage U (see fig. 2 and 3) having a low pressure inside the housing 151, for example. The bolts C fasten the 1 st block a and the 2 nd block B inside the case 151.

The through hole K and the bolt hole D are not limited to the above-described positions, and may be formed at other positions. The through-holes K and the bolt holes D may be provided in a region where the misalignment force between the 1 st block a and the 2 nd block B is high and oil leakage may occur. After the bolt C is tightened, the opening of the 2 nd through hole K2 is closed by the cover P.

[ modified examples ]

A modification of the hydraulic control valve device 150 will be described below. In the following description, the same names and reference numerals are used for the same configurations as those of the above-described embodiment, and overlapping descriptions are omitted as appropriate. In the above embodiment, the 1 st through hole K1 formed in the 1 st block a is closed by the cover P. However, the 1 st through hole K1 may be used for other purposes.

As shown in fig. 6, the 1 st through hole K1 may also serve as a passage through which the working oil flows. The 1 st through hole K1 may be used as a connection port of a passage for operating the actuator, for example. The 1 st through hole K1 is used as a passage for hydraulic oil for an actuator that can be switched by a spool (not shown) included in the spool S, for example. A connecting member F is attached to the opening of the 1 st through hole K1 formed in the other surface a 2.

As shown in fig. 7, the 1 st through hole K1 may also serve as a passage for the hydraulic oil that actuates a relief valve that adjusts the pressure of the hydraulic oil. A relief valve 300 is attached to the opening of the 1 st through hole K1 formed in the other surface a 2. A passage K4 for the hydraulic oil released from the relief valve 300 is formed in the 1 st through hole K1.

As described above, according to the hydraulic control valve device 150, the bearing surfaces for the bolts C connecting the 1 st block a and the 2 nd block B and the bolt holes D are formed in the 1 st block a and the 2 nd block B, and therefore, there is no need to secure a space for increasing the bearing surfaces of the bolts C around the end surface of the 1 st block a, and the device structure can be made compact.

Since the bolt hole D and the seating surface of the bolt C are formed between the spool hole H formed in the 1 st block a and the spool hole I formed in the 2 nd block B, the spool hole H, I is not deformed even if the bolt C is tightened, and the 1 st block a and the 2 nd block B can be brought into close contact with each other.

The present invention is not limited to the above-described embodiments, and various modifications may be made to the above-described embodiments without departing from the scope 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 also use a stud and a nut instead of the bolt C. The hydraulic system 1 may be applied not only to a construction machine but also to other devices using a working fluid such as a hydraulic press.

Industrial applicability

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 degree of contact between blocks without deforming the shape of a spool hole.