JPH07158755A - Method for coupling two members and method for composing multiple valve - Google Patents

Abstract

PURPOSE:To couple two cylindrical members simply and strongly through a ring member by forming a recess at the mating part of each member, setting the ring member in these recesses, pressing the two members in the direction, and a allowing the ring member to make deformation and to bite into the two members. CONSTITUTION:One-side ends of two cylindrical members 1, 2 are butted together while their holes, i.e., axes, are located identically. At the mating ends of the two members 1, 2, diameter enlarged portions 1a, 2a are provided which have greater diameter than the bores of the other parts 1b, 2b, and between them stepped parts 1c, 2c are formed. At the bores of the diameter enlarged portions 1a, 2a, ring-form grooves 1d, 2d are formed. A ring member 3 is furnished in a recess formed by these diameter enlarged portions 1a, 2a and is left undergoing a plastic deformation by applying a force in the butting direction A of the members 1, 2, which are thereby coupled together through the grooves 1d, 2d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting two members and a method for constructing a multiple valve, and more particularly to a method for connecting two members which exhibits a strong connection and a high sealing property with a simple structure, and this connection method. The present invention relates to a method for constructing a multiple valve in which a plurality of body elements having a plurality of holes are combined and integrated by utilizing

[0002]

2. Description of the Related Art As one of the methods of constructing a main body (housing portion) of a valve device called a multiple valve, there is a method of combining a plurality of blocks which are main body elements and connecting them to form a main body. Each of the plurality of blocks is provided with a plurality of holes for disposing a member forming a valve, and the plurality of blocks each function as a united valve section. As described above, there is conventionally known a method of forming a plurality of blocks, that is, a valve section, and combining and integrating the plurality of blocks as a stack to form a main body of a valve device (hereinafter referred to as a stack method). Further, as another configuration method of the main body, a monoblock method in which a main body is formed as a single body by combining complicated cores is known.

[0003]

In the conventional method of constructing the valve device main body described above, in the monoblock method, since the main body is formed as an integral body from the beginning, there is an advantage that there is no risk of oil leakage to the outside. However, there are drawbacks such as that it takes time and cost to manufacture the core, and that there are some problems in reliability due to insufficient casting burr.

Further, in the stacking method, since a plurality of blocks produced separately are sequentially joined one by one, extra portions such as fastening means are generated, and the whole cannot be made slim, and the whole is large, and the cost is high. become. If the connection is not carefully performed, the sealing property of the connecting portion will be incomplete, and problems such as oil leakage will occur.

The present invention intends to improve the joining method in the stack method, and proposes a new joining method with respect to the joining method of a plurality of blocks which are elements of the main body.

[0006] As a conventional method for connecting two members related to the present invention, there is a connecting method disclosed in Japanese Patent Publication No. 55-48895. According to this joining method, for example, a method of joining an annular outer member and an inner member surrounded by the outer member, and an inner peripheral surface of the outer member,
A recess having a required shape is formed on each of the outer peripheral surfaces of the inner member facing the inner peripheral surface, and a coupling member satisfying the required conditions is provided in the space between the inner peripheral surface of the outer member and the inner peripheral surface of the inner member. The connecting member is inserted and arranged, and the connecting member is pressed by the pressing member in a state of being arranged on the mold, and the outer member and the inner member are connected by plastic deformation of the connecting member.

In the above-mentioned two-member joining method, since the pressing member directly applies a force to the pressed portion,
It cannot be applied to the case where the pressing member cannot directly apply a force to the pressed portion, such as joining the two members side by side in the axial direction. Therefore, it is desired to improve the above-mentioned two member joining method so that it can be used in the above-mentioned stacking method.

An object of the present invention is to provide a method for joining two members which can join two members arranged in the axial direction with a simple structure, and which can exert a strong joint and a high sealing property.

Another object of the present invention is to provide a method for constructing a multiple valve which can realize the production of an inexpensive and highly reliable valve device main body and which can be made compact and compact.

[0011]

A method for connecting two members according to the present invention is a method for connecting two members each having a hole by aligning the holes and arranging them in series in the axial direction of the holes. A recess is formed in each of the holes of the two members opposite to each other, and a ring member is arranged in this recess, and by applying a pressing force to each of the two members, the ring member is plastically deformed, and the ring member is interposed. Is a method of joining the two members together.

In the above method, preferably, a groove (undercut) is formed in the inner peripheral surface of each recess of the two members.
And a flow-in is caused in the groove portion by plastic deformation of the ring member.

Another method of joining two members according to the present invention is a method of joining two members each having a hole by aligning the holes and arranging them in series in the axial direction of the hole to join them. A recess is formed in the facing portion of the hole, a first ring member is arranged in this recess, and a second ring member is provided around the first ring member and between the facing surfaces of the two members. Place and
In this method, a pressing force is applied to each of the two members to cause plastic deformation of each of the two members due to the pressing action of the second ring member, and the two members are joined together via the first ring member. .

In the above method, preferably, at least one groove portion (undercut) is formed on the outer peripheral surface of the first ring member, and the two members are caused to flow into the groove portion by plastic deformation.

In the above method, preferably, the first ring member is pre-bonded to either one of the two members, and then the first ring is plastically deformed by the pressing action of the second ring member. A member is joined to another member.

In each of the above methods, the hardness of the second ring member is relatively higher than the hardness of the other members.

In the method for constructing a multiple valve according to the present invention, each of the plurality of main body elements is individually made, and a connecting portion is provided between each of the plurality of main body elements to combine and integrate the plurality of main body elements. A method of configuring a multiple valve, in which a plurality of main body elements are arranged with the ends of a common oil passage hole formed in each of the plurality of main body elements facing each other, and This is a method in which a connecting portion is provided in the portion and one of the above-described two member connecting methods is applied to this connecting portion.

In the above-mentioned method, preferably, a pipe member for enhancing the bonding strength and the sealing property is arranged so as to pass through the common oil passage hole.

In the above method, preferably, a bar-shaped member penetrating the plurality of main body elements is provided, and the plurality of main body elements are connected by this bar-shaped member.

In each of the above-mentioned methods, it is preferable that both ends of the pipe member and the rod member are fixed by plastic deformation by pressing.

In the above method, the plurality of body elements are
The main element is divided in a direction orthogonal to the axial direction of the hole in which the main valve is arranged.

In the above method, the plurality of body elements are
It is a body element divided in the axial direction of the hole in which the main valve is arranged.

In the above method, a plurality of holes are formed,
Moreover, the plurality of holes are arranged in a radial arrangement position so as to surround the central portion of the main body element.

In the above method, the supply and discharge passages connected to each of the plurality of holes are arranged radially with respect to the central portion of the body element.

[0025]

In the present invention, the two members having the hole are joined by using the intermediate member of the ring member, and the force is applied so as to press the opposing surfaces of the two members with the intermediate member interposed. Is added to cause plastic deformation (metal flow or the like), and the two members are coupled via the intermediate member based on the plastic deformation action. Also, the method of connecting the two members is used to realize the method of constructing the multiple valve. The main body of the multiple valve is pre-divided, and the individually manufactured main body blocks are combined to form a valve device. Then, the above-described joining method of the two members is applied to the joining portion at the end portion of the hole that serves as the common oil passage of the main body block. Further, a pipe member is inserted into the hole as needed in order to enhance the bonding strength and the sealing property.

[0026]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

First, a method of connecting two members, which is a basic technique of the present invention, will be described with reference to FIGS.

This method of joining two members is applied to two members having an axial direction by having a hole, for example, while the axial directions of the two members are made to coincide with each other.
This is a method of joining two members. A cylindrical member is an example of a representative member having an axial direction. In this joining method, joining is performed by interposing another intermediate member between the two members to be joined.

FIG. 1 shows a first embodiment. The two tubular members 1 and 2 are arranged such that one ends thereof are abutted with each other and their holes, that is, their axes are aligned. In this embodiment, the tubular members 1 and 2 are cylindrical pipe members and are made of a material having a relatively high hardness.
At the opposite ends of the tubular members 1 and 2, along the edges of the inner peripheral surface, the expanded diameter portions 1a, 2 having a larger diameter than the other inner peripheral surface portions are provided.
a is formed, and step portions 1c and 2c are formed between the expanded diameter portions 1a and 2a and the other inner peripheral surface portions 1b and 2b.
Ring-shaped groove portions (undercuts) 1d and 2d are preferably formed on the inner peripheral surfaces of the expanded diameter portions 1a and 2a, respectively. With the cylindrical members 1 and 2 butted against each other,
The ring member 3 is arranged in the recess formed by the enlarged diameter portions 1a and 2a at the opposing portion. The ring member 3 is formed of a material having a hardness lower than that of the tubular members 1 and 2, and the inner diameter thereof is substantially the same as the diameters of the other inner peripheral surface portions 1b and 2b of the tubular members 1 and 2. . The axial length of the ring member 2 is determined from the axial length of the recess when the recesses are formed by the enlarged diameter portions 1a and 2a by bringing the opposite ends of the tubular members 1 and 2 into contact with each other. Is also set to be slightly longer.

The arrangement shown in FIG. 1 is performed on a pressing device (not shown). In the state shown in FIG. 1, a force is applied in the axial direction of the tubular members 1 and 2 as indicated by arrow A. When the force is applied in this way, the ring member 3 is plastically deformed (metal flow or the like) and flows into the grooves 1d and 2d, so that the tubular member 1 and the ring member 3, and the tubular member 2 and the ring member 3 Each is firmly coupled via the groove portions 1d and 2d. As a result, the two tubular members 1 and 2 are firmly connected.

As a modification of the above-described embodiment, for example, the ring member 3 is preliminarily joined to either one of the tubular members 1 and 2, and the other tubular member is applied by applying the above joining method. It can also be configured to couple to a member.
This modification can be similarly applied to the following embodiments.

FIG. 2 shows a second embodiment of the joining method of two members. In this embodiment, the tubular members 11 and 12 and the ring member 13 are combined as in the case of FIG.
In terms of form, the tubular members 11 and 12 are the same as the tubular members 1 and 2, and the ring member 13 is the same as the ring member 3. In addition, the tubular member 11,
The ring member 1 is formed of a material that causes plastic deformation.
No. 3 has no limitation on the hardness of the material. further,
Another ring member 14 made of a material having high hardness is arranged around the ring member 13 between the tubular members 11 and 12, and two groove portions 13a and 13b are formed on the outer peripheral surface of the ring member 13. Is formed.

In this arrangement and structure, a force is applied as indicated by arrow A as in the case of the above embodiment. Then, the hard ring member 14 causes the tubular members 11, 12 on both sides to
Of the cylindrical members 11 and 12, plastic deformation (metal flow or the like) occurs at the inner peripheral surfaces of the enlarged diameter portions 11a and 12a of the cylindrical members 11 and 12, and flow into the groove portions 13a and 13b occurs. The ring member 13, the tubular member 12, and the ring member 13 are firmly coupled. As a result, the two tubular members 11 and 12 are firmly joined.

FIG. 3 shows a third embodiment of the joining method of two members. In FIG. 3, elements that are substantially the same as the elements described in FIG. 2 are given the same reference numerals. In this embodiment, a ring member 1 different from the ring member 14 of FIG.
4 ′ is used, and the protruding piece portion 1 that protrudes outwardly on the outer peripheral surface thereof
4'a is formed. The protruding piece portion 14'a acts as a spacer between the tubular members 11 and 12, and also acts as a stopper when the tubular members 11 and 12 are pressed in the axial direction. Other configurations, that is, the shape and the material are the same as those in the above-described embodiment.

FIG. 4 shows a fourth embodiment of the method for connecting two members, which is a modification of the embodiment shown in FIG. In this embodiment, a member 21 having two holes 21a and 21b
And a member 22 that also has two holes 22a and 22b
Are connected in a state where the holes 21a and 22a are aligned with each other and the holes 21b and 22b are aligned with each other. The members 21 and 22 each have an arbitrary outer shape and are block-shaped. Hole 21
a and the abutting portion of the hole 22a, and the hole 21b and the hole 22b
At the abutting portion, a recess 23 is formed by the enlarged diameter portion as in the above embodiment, and the ring member 13 is arranged in this recess 23. Further, another hard ring member 14 is arranged around the ring member 13. When an axial force is applied to each of the members 21 and 22 in this arrangement structure, the holes 2
The joint portions described with reference to FIG. 2 are formed in the peripheral portions of the abutting portions of the holes 1a and the holes 22a and the abutting portions of the holes 21b and the holes 22b, and the two members 21 and 22 are firmly joined. As a result, the holes 21a and 22a and the holes 21b and 22b are connected.

In the coupling structure shown in FIGS. 2 to 4 described above,
It has a particularly high sealing property and can seal even when high-pressure fluid flows in each hole.

Next, a method of constructing a main body (housing portion) of a valve device called a multiple valve will be described. The method of constructing the multiple valve is realized by using any one of the various embodiments of the method of connecting the two members described above. In the following embodiment, the two-member joining method described with reference to FIG. 1 is used.

5 to 8 show a first embodiment of a method of constructing a valve device called a multiple valve. FIG. 5 shows a cross section of one of the elements forming the valve device. Reference numeral 31 is a block (main body element) that is an element forming a housing main body of the valve device, and inside the block 31, a pressure compensation valve 32 and a main valve (spool valve) 33 are provided. 34 is a pressure compensation valve 3
2 is a hole for arranging 2 and 35 is a hole for arranging the main valve 33. The holes 34 and 35 have a required structure and are in communication with each other. 36 is a pressure port of the pump which communicates with the hole 34, and 37 and 38 are tank ports which communicate with the hole 35, respectively. Pressure port 36 and tank port 37,
38 is an oil passage common to other blocks adjacent to the block 31 and having a similar structure.

FIG. 6 is a sectional view taken along the line BB in FIG. 5, in which the vertical section of the holes forming the tank ports 37 and 38 is shown in the upper part of the figure, and the pressure port 36 is shown in the lower part of the figure. The longitudinal section of the hole forming the is partially shown.
In the cross-sectional view shown in FIG. 6, other blocks 31A and 31B that are adjacent to the left and right of the aforementioned block 31 are shown. These blocks 31A, 31B are also body elements forming the valve device. Blocks 31, 31A, 3 which are main elements
1B is individually prepared in advance. The main body housing of this valve device has three blocks 31, 31A, 31
B is arranged in the axial direction of the pressure port 36 (direction orthogonal to the axial direction of the hole 35 in which the main valve 33 is arranged), and these are joined together. That is, three blocks 31, 31A,
31B is a block divided in the axial direction of the hole forming the pressure port 36. In the blocks 31A and 31B, the same structural parts as those of the block 31 are designated by the same reference numerals. The contact portions of the peripheral portions of the pressure port 36 and the tank ports 37 and 38 between the blocks 31A and 31 and the contact portions of the peripheral portions of the pressure port 36 and the tank ports 37 and 38 between the block 31 and block 31B, respectively. At, the joint portions 39 and 40 are formed. The structures of the coupling portions 39 and 40 are the same. In FIG. 6, the pressure compensation valve 32 and the main valve 33 are not shown.

FIG. 7 is an enlarged partial cross-sectional view showing, as an example, the state before forming the joint portion of the joint portion 39.
According to the structure of this connecting portion, the three blocks 31, 31 are
A pipe member is inserted into an oil passage hole common to A and 31B to form a joint portion. 6 and 7
As shown in FIG.
Is inserted, and the pipe member 42 is inserted into the tank port 37 (38). In the pipe member 41, 41a is a closed end portion, 41b is an open end portion, and in the pipe member 42, 42a is a closed end portion and 42b is an open end portion. Further, the pipe member 41 communicates with the hole 34 in which the pressure compensation valve 32 in each block 31, 31A, 31B is arranged, and the pipe member 42 includes the hole 35 in which the main valve 33 in each block 31, 31A, 31B is arranged. I understand.

Referring to FIG. 7, the structure of the coupling portion 39 and the method of coupling will be described in detail. Pipe member 41 to the pressure port 36
At the stage of inserting the block 31A and the block 3
The ring member 43 is arranged around the pipe member 41 in a state of being housed in an annular recess formed in a contact portion facing 1 with the pipe member 41. The ring member 43 is formed of a soft material (metal, plastic, rubber, etc.) that undergoes plastic deformation when a required pressure is applied. Further, ring-shaped grooves (undercuts) 44, 45, for example, are formed on the inner peripheral surface of the block 31A in which the above-mentioned recess is formed and the enlarged diameter portion of the block 31. The axial length of the recess is set shorter than the axial length of the ring member 43. Therefore, as shown in FIG. 7, the gap 46 is formed in the initial set state. The machined surface of each block is only the surface for forming the gap 46. In this state, when a force is applied to each of the blocks 31A and 31 in the axial direction of the pipe member 41 in the A direction, the ring member 43 is crushed and plastically deformed, and the ring members 43 are formed in the groove portions 44 and 45. The material flows in, and at the same time, the pipe member 41 is firmly and tightly fixed.

The structure relating to the above-mentioned connecting portion 39 is the same as the other connecting portion 40 between the block 31A and the block 31, and the connecting portions 39 and 40 between the block 31 and the block 31B.
Is the same, and, for example, all the coupling portions 39 and 40 shown in FIG. 6 are simultaneously formed by the pressing in the A direction.

Due to the structure of the connecting portions 39 and 40,
Adjacent blocks are connected to each other via a ring member 43 provided therebetween, and the pipe members 41, 42 are connected.
It is possible to seal the fluid that may enter from the outside of the.

The structure of the coupling portions 39 and 40 is the same as that shown in FIG.
2 is a modified example of the two-member coupling structure, and is different only in that a pipe member is added to improve the sealing property. As a structure of the coupling portions 39 and 40, it is needless to say that the coupling structure shown in FIGS. 2 to 4 can be used.

As is clear from FIG. 6, the pipe member 4
Alternatively, both ends of the pipe member 42 and the pipe member 42 may be fixed by applying the same pressing force as described above to cause plastic deformation. An example of this fixing portion is shown in the enlarged sectional view of FIG. FIG. 8 shows a joint portion of the open end portion 41b of the pipe member 41. For example, when a ring-shaped groove 46 is formed in the pipe member 41 and a pressing member such as a punch is driven to form a ring-shaped recess 47, the block 3 is formed.
Plastic deformation occurs in 1A, the pipe member 41 is caulked, and the block 31A and the pipe member 41 are joined. Similar coupling structures are formed at the other end of the pipe member 41 and both ends of the pipe member 42.

Next, with reference to FIGS. 9 and 10, a second embodiment of the method for constructing a multiple valve will be described. FIG. 9 corresponds to FIG. 5 and is a modification of the embodiment described in FIG. FIG. 10 is a cross-sectional view taken along the line CC in FIG. 9 and 10, the same elements as those described in the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. In the construction method according to this embodiment, in the construction method according to the first embodiment described above, the pipe members 41 and 42 are not used, and at least four tie rods 48 are attached so that three blocks 31, 31A and 31B are provided. The rest of the structure and construction are the same as in the first embodiment, except that the connection is strengthened. Therefore, in the present embodiment, the sealing is performed only by the joining due to the plastic deformation of the soft material, the joining axial force is given to some extent, and the remaining joining force is supplemented by the tie rod 48. The structure of the connecting portion 40 and the like in FIG. 10 is the same as the connecting portion of the two members described in FIG. Again 4
As shown in FIG. 10, each of the tie rods 48 of the book is attached in a state of penetrating the three blocks 31, 31A, 31B, and both ends thereof are plastically deformed similarly to the joint structure described in FIG. Fixed to the block based on.

In the second embodiment described above, a sufficient joining force can normally be obtained at the joining portions 39 and 40, and the tie rod 48 is added with a safety margin. Providing the tie rod 48 is not an essential requirement.

According to the above-described method for constructing a multiple valve, the multiple valve can be manufactured by only performing the pressing work, the manufacturing process is simplified as a whole, and the manufacturing cost can be reduced. Further, since it is only necessary to locally perform the surface processing of the block of each main body element, it is possible to reduce the number of steps and the cost. Further, there is no oil leakage, the sealing property is improved, and the reliability is greatly improved.

Next, with reference to FIGS. 11 to 13, a third embodiment of the method of constructing the multiple valve will be described. Also in the method of configuring the multiple valve according to this embodiment, the valve device forming the multiple valve is divided into a plurality of blocks, the blocks are individually manufactured, and then these blocks are combined by the above-described predetermined connecting method, It is constructed so as to make up the entire valve device, and in this respect, it is the same as the construction method of the multiple valve of the above-mentioned embodiment.
The difference from the configuration method according to the above-described embodiment is that the division by a plurality of blocks is performed in the direction orthogonal to the axial direction of the pressure port, that is, in the axial direction of the hole in which the main valve (spool valve) is arranged. .

FIG. 11 is a sectional view showing the structure of the multiple valve. In FIG. 11, elements that are substantially the same as the elements described in FIGS. 5 to 8 above are given the same reference numerals. In this embodiment, with respect to the axial direction of the hole 35 in which the main valve is arranged,
The blocks 51, 52, 53, which are cut at right angles to the axial direction and divided into three, are joined to form a housing body of the valve device. The blocks 51 and 53 are provided with tank ports 37 and 38, respectively, and the block 52 is provided with a pressure port 36. In this embodiment, the blocks 51 and 53 have the same structure for simplification.
In FIG. 11, reference numerals 61 and 62 are joint surfaces between the three blocks, and 63 at four places are joint portions. The connecting portion 63 is a contact portion of each peripheral portion of the two holes 35 and 64 that communicate between the block 51 and the block 52, and the two holes 3 that also communicate between the block 52 and the block 53.
5, 64 are formed at the contact portions of the peripheral portions. Connecting part 6
The structure and the forming method of 3 are the same as the case of the coupling portion 39 (or the coupling portion 40) described based on FIG. 7, and the coupling member 63 also uses the ring member 43.
The hole 64 allows the fluid from the pump port to flow into the pressure port 3
6, a pipe member 65 having one end closed and the other end open is fitted in the hole 64. Both ends of the pipe member 65 are fixed by the coupling structure shown in FIG.

FIG. 12 is a simplified view of a section taken along the line DD in FIG. This multiple valve is shown in Fig. 1.
As shown in FIG. 2, five holes 35 for disposing the main valve (spool valve), the above-mentioned pressure port 36 and the hole 6 are provided.
4 is shown. That is, it has a multi-spool structure. Pressure hydraulic oil delivered from the pump port through holes 64 and pressure port 36 is supplied to five holes 35.

FIG. 13 is a sectional view showing a portion related to the connection structure of the two tank ports 37 and 38 shown in FIG. 13, the same elements as those shown in FIG. 11 are designated by the same reference numerals. The connecting portion 66 is shown in FIG.
It has the same coupling structure as that of the coupling portion 63 described above.
67 is a hole for a common oil passage, which is formed by a pipe member 68, and the hole 67 connects the tank ports 37 and 38.

In the above embodiment of the method for constructing a multiple valve, an example of three divisions has been described, but the invention is not limited to this, and two or four divisions can be used if necessary. Also, an example is shown in which the holes 35 for arranging the main valves are scattered in a ring shape at radial arrangement positions with respect to the center of the block, but this configuration example is preferable for the split structure of the above-mentioned embodiment. Furthermore, when supplying and discharging the hydraulic oil to and from the plurality of main valve arranging holes 35, it is natural that the connecting ports are also arranged radially around the block center so as to surround them.

[0054]

As is apparent from the above description, the present invention has the following effects.

According to the two member joining method of the present invention,
A member having a hole such as a cylindrical member can be joined through an intermediate member such as a ring member and by causing a pressing action, and has a simple structure, small size, low cost, strong and high sealing property. It can be held and bonded.

According to the method for constructing a multiple valve according to the present invention,
The main body of the multiple valve is divided in advance and the main body elements are manufactured individually,
In addition, a plurality of main body elements are combined by using the above-described two-member connecting method to form the whole. For this reason, only the local surface processing of the main body block and the press work are required for the machining, and the man-hours can be reduced, the working process can be simplified as a whole, and the manufacturing cost can be reduced. In addition, sealing performance such as oil leakage was improved, and reliability was greatly improved. No extra space is required in the connecting portion, and therefore the size can be reduced, and along with this reduction in size, the multiple valve can be reduced in size and size. In addition, since the pressing (pressing) work is the basic operation for connecting and assembling the multiple valves, the operation is simple and a large number of connecting portions can be formed at the same time, which is highly economical.

Further, in the structure in which the multiple valves are divided in the axial direction of the holes for the main valve arrangement, the arrangement structure of the common oil passage can be rationalized. For example, a radial arrangement can be utilized, thus preventing the body from becoming large due to division. Moreover, the design of the oil passage is simplified, and the valve device as a whole can be made compact.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view for explaining a first embodiment of a method for joining two members according to the present invention.

FIG. 2 is a vertical cross-sectional view for explaining a second embodiment of a method for joining two members.

FIG. 3 is a vertical cross-sectional view for explaining a third embodiment of a method for joining two members.

FIG. 4 is a vertical cross-sectional view for explaining a fourth embodiment of a method for joining two members.

FIG. 5 is a sectional view of a valve device to which the first embodiment of the method for constructing a multiple valve according to the present invention is applied.

FIG. 6 is a sectional view taken along line BB in FIG. 5 for explaining the first embodiment of the method of constructing the multiple valve.

FIG. 7 is a partially enlarged cross-sectional view of a joint portion.

FIG. 8 is a partially enlarged cross-sectional view of a fixed portion.

FIG. 9 is a cross-sectional view of a valve device to which a second embodiment of the method for constructing a multiple valve is applied.

FIG. 10 is a sectional view taken along the line CC in FIG. 9 for explaining the second embodiment of the method for constructing the multiple valve.

FIG. 11 is a sectional view for explaining a third embodiment of the method of constructing a multiple valve.

12 is a cross-sectional view taken along the line DD in FIG.

13 is a cross-sectional view showing a connection state of tank ports in FIG.

[Explanation of symbols]

 1, 2 tubular members 1a, 2a expanded diameter portion 1d, 2d groove portion 3 ring member 11, 12 tubular member 13, 14 ring member 13a, 13b groove portion 21, 22 two members to be coupled 31, 31A, 31B block ( Body element) 32 Pressure compensation valve 33 Main valve (spool valve) 36 Pressure port 37, 38 Tank port 39, 40 Coupling part 41, 42 Pipe member 43 Ring member 48 Tie rod 51, 52, 53 Block 63 Coupling part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Morio Tamura Inventor, 650 Jinrachi-cho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. Tsuchiura factory (72) Inventor Akira Tokaibayashi 1473-8, Tahiko, Katsuta-shi, Ibaraki Prefecture

Claims (14)

[Claims] 1. A method for joining two members each having a hole by aligning the respective holes and arranging them in series in the axial direction of the holes, and forming a recess in the facing portion of each hole of the two members. And forming a ring member in this recess, and applying a pressing force to each of the two members to cause plastic deformation in the ring member, thereby connecting the two members via the ring member. A characteristic method of joining two members. 2. The method for connecting two members according to claim 1, wherein a groove is formed on an inner peripheral surface of each of the recesses of the two members, and a plastic member is deformed to prevent the flow into the groove. A method for joining two members, characterized in that it occurs. 3. A method for joining two members each having a hole by aligning the respective holes and arranging them in series in the axial direction of the holes, and forming a recess in the facing portion of each hole of the two members. Forming a first ring member in the recess and arranging a second ring member around the first ring member and between opposing surfaces of the two members; By applying a pressing force to each of the members, the second
Of the two ring members is plastically deformed by the pressing action of the ring member of
A method for joining two members, which comprises joining two members. 4. The two-member joining method according to claim 3, wherein at least one groove is formed on the outer peripheral surface of the first ring member, and plastic deformation of the two members causes flow into the groove. A method of joining two members, characterized in that 5. The two-member joining method according to claim 3, wherein the first ring member is pre-joined to either one of the two members, and then the second ring member is pressed. A method for connecting two members, wherein the first ring member is connected to another member by plastic deformation due to an action. 6. The method according to claim 3, wherein
In the method of joining members, the hardness of the second ring member is relatively higher than the hardness of other members. 7. A method for constructing a multiple valve in which each of a plurality of body elements is individually made, and a coupling portion is provided between each of the plurality of body elements to couple and integrate the plurality of body elements. , The plurality of main body elements are arranged such that ends of a common oil passage hole formed in each of the plurality of main body elements are opposed to each other, and the plurality of main body elements are coupled to the opposite end portions of the oil passage hole. A method for constructing a multi-valve, wherein a portion is provided, and the joining method for joining two members according to any one of claims 1 to 6 is applied to the joining portion. 8. The method for constructing a multiple valve according to claim 7, wherein a pipe member for enhancing coupling strength and sealing performance is arranged through the common oil passage hole. How to construct a continuous valve. 9. The method for constructing a multiple valve according to claim 7, wherein a rod-shaped member penetrating the plurality of main body elements is provided, and the plurality of main body elements are connected by the rod-shaped member. How to configure multiple valves. 10. The method for constructing a multiple valve according to claim 8 or 9, wherein both ends of the pipe member and the rod-shaped member are fixed by plastic deformation by pressing. How to configure. 11. The method for constructing a multiple valve according to claim 7, wherein the plurality of main body elements are main body elements divided in a direction orthogonal to an axial direction of a hole in which the main valve is arranged. And a method of configuring a multiple valve. 12. The method for constructing a multiple valve according to claim 7, wherein the plurality of main body elements are main body elements divided in the axial direction of a hole in which a main valve is arranged. How to construct a valve. 13. The method for constructing a multiple valve according to claim 12, wherein a plurality of the holes are formed, and the plurality of the holes are arranged so as to surround a central portion of the main body element at radial arrangement positions. A method of constructing a multiple valve characterized by the above. 14. The method for constructing a multiple valve according to claim 13, wherein the supply / discharge passages connected to each of the plurality of holes are arranged radially with respect to the central portion of the main body element. And a method of configuring a multiple valve.