JPH11344143A - Multi-directional changeover valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-directional changeover valve which shows freedom in selective proper orders in arranging connection members composing the valve in view of flowing resistance and operation speed, and exhibits sufficient performance of an actuator. SOLUTION: In a multi-directional changeover valve, an eighth direction changeover valve 15 is arranged on one side of an arrangement of plural members to be connected. A first screw hole 20 with which a front of a first connection belt 18 is screwed is formed on a connection surface of a valve body 19. A through-hole 21 through which the first connection bolt 18 penetrates is formed on the other main body of the other connection member. The first connection bolt 18 penetrates the through-hole 21 of the connection member and screwed with the first screw hole 20 of the eight direction changeover valve, for unitedly connecting the connection members. A second screw hole 25 is formed on the other surface of the main body 19 of the eight direction changeover valve. A second connection bolt 26 is screwed with the second screw hole 25 for integrally connecting other connection members.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of directional control valves which are used in various industrial machines such as hydraulic excavators and control the flow rate of pressure oil supplied to and discharged from various actuators driven by a liquid pressure source. The present invention relates to a multiple direction switching valve configured to be connected.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open Publication No. Hei 9-166236 and Japanese Utility Model Laid-Open Publication No.
No. 1503, and the like. In the former document, a supply / discharge port main body member that communicates separately with a hydraulic pump and a hydraulic tank is disposed at one end, and a discharge port main body that communicates with the hydraulic tank is disposed at the other end side, and various actuators are disposed therebetween. A multi-way directional control valve is disclosed in which a plurality of directional control valves communicating with each other are arranged, and adjacently tightly joined to each other by first connecting bolts, and integrally connected and fixed. In the middle of the arranged directional control valve group, another supply port main body communicating with the hydraulic pump is further provided. Further, a spare directional control valve can be added to the discharge port main body located on the other end side on the outer surface side by a second connecting bolt. The latter document discloses a configuration in which a spare directional control valve can be added to the outer surface of a supply / discharge port main body member located at one end by a second connection bolt.

[0003]

The order of arranging the connected members of this type of multiple directional switching valve takes into account the positions of the actuators and their operating speeds of the industrial machine and the positions of the hydraulic pump and the hydraulic tank. It is decided. In addition, when the supply / discharge port body and the directional control valve are arranged so that the flow resistance is reduced, and the mutual operation speed is the same by the same operation, the directional control valve has the same flow resistance. And is determined in advance so as to be in the optimal order as possible. However, the former of the prior art, as described above, uses the discharge port main body as a base for additionally fixing the spare directional switching valve, so that the position of the discharge port main body is the other end side as described above, that is, However, there is a problem that the degree of freedom in selecting an appropriate order for forming a piping structure that reduces the flow resistance in consideration of the position of the hydraulic tank is small. In the latter case of the prior art, the position of the supply / discharge port main body is restricted because the supply / discharge port main body member is used as a base for additionally fixing the spare directional control valve instead of the directional control valve. There is a problem that it is difficult to arrange the connected members in consideration of the positions of the hydraulic pump and the hydraulic tank, the operation speed of the actuator, and the mutual operation speed.

[0004] It is an object of the present invention to provide a high degree of freedom in selecting an appropriate order in terms of the flow resistance, the operating speed, and the like in the order of arranging the connected members constituting the multiple directional switching valve. It is an object of the present invention to provide a multiple direction switching valve capable of sufficiently exhibiting performance.

[0005]

According to a first aspect of the present invention, a spool is slidably inserted into a valve body, and the sliding of the spool causes the flow rate of pressure oil to an actuator. And a plurality of directional control valves for controlling the flow direction are provided, and a plurality of connected members including the directional control valves are sequentially arranged from one end to the other end and are adjacent to each other by a first connecting bolt. In the multiple direction switching valve which is tightly joined and integrally connected, as an arrangement of the plurality of connected members, one direction switching valve is disposed on the other end side, and the other end side is provided. Is provided with a first screw hole into which a tip end of the first connection bolt is screwed in a joint surface thereof, and the other body of the other connected member has a first screw hole. A through hole through which the first connecting bolt passes is provided, and the first connecting bolt is provided. The connected member is integrally connected by screwing a bolt through the through hole of the another connected member and into the first screw hole of the direction switching valve on the other end side, and A second screw hole is also provided on the other surface of the valve body of the direction switching valve on the other end side, and another connected member is screwed into the second screw hole to form another connected member. It is characterized by being formed so as to be integrally connectable. According to the present invention, even if one of the plurality of directional control valves is positioned at the other end, the directional control valve can be added, so that the position of the other connected member can be changed according to the flow direction. It is possible to freely determine the over-resistance to be small, and it is still possible to arrange another directional switching valve having the same operation speed by the same operation at the position where the flow over-resistance becomes the same. Yes, that is, the degree of freedom in determining the order of arrangement is increased, and it becomes easier to determine an appropriate order.

According to the present invention, another connected member other than the directional control valve is not located at the other end, and one directional switch valve is located at the other end. Accordingly, it is possible to easily further add a discharge port main body to the main body of the direction switching valve on the other end side via the second connection bolt. Therefore, if the multiple directional control valve according to the present invention is used for an industrial machine having a large-capacity actuator such as a breaker, for example, by adding the discharge port body together with the directional control valve for the actuator as a pair, the hydraulic pressure can be increased. Flow resistance when discharging pressurized oil to the tank can be reduced, and as a result,
Since the flow rate of the pressure oil can be increased, the operation speed of the actuator can be increased. Therefore, the performance can be sufficiently exhibited even for a large-capacity actuator.
On the other hand, for an industrial machine that does not have a large-capacity actuator, the multiple connection directional control valve without the addition via the second connection bolt, that is, the first connection bolt is integrally connected. The performance of each actuator can be sufficiently exhibited only by a fixed group of connected members.

According to a second aspect of the present invention, in the first aspect, the connected member integrally connected by the first connecting bolt is connected to the hydraulic tank via a pipe. A supply / discharge port main body member having a pump port connected via piping to a tank port and a hydraulic pump is included, and a direction switching valve disposed on the other end side is a traveling switching valve, a turning switching valve, It is one of a boom switching valve, an arm switching valve, and a bucket switching valve. According to the present invention, the above-mentioned operation and effect are particularly remarkable when applied to a multiple direction switching valve of the type having the supply / discharge port main body member and this type of each direction switching valve.

According to a third aspect of the present invention, in the first or second aspect, the first screw hole and the second screw hole are provided in the other end of the directional switching valve. Are formed so as to penetrate through.
According to the present invention, since the first screw hole and the second screw hole penetrate the valve body, it is possible to form the pitch of both screw holes from only one direction of the valve body. Processing man-hours can be reduced.

According to a fourth aspect of the present invention, in the first or second aspect, the first screw hole and the second screw hole are provided in the valve body of the directional switching valve at the other end. Are formed independently in a non-penetrating state. According to the present invention, by this independent formation, the pitch of both screw holes can be formed only in the portion where the two connecting bolts are screwed, thereby facilitating the processing. That is, if the screw hole is long, the bend is likely to occur. Therefore, a device for processing so as not to bend or another device is separately required. However, according to the present invention, such a necessity does not occur.

The invention according to claim 5 of the present application is the invention according to claim 4, wherein the first screw hole and the second screw hole are connected to each other.
The screw hole is formed coaxially. According to the present invention, the coaxial structure of the first screw hole and the second screw hole allows the same type of main body to be used as an additional connected member.

The invention according to claim 6 of the present application is the invention according to claim 4, wherein the first screw hole and the second screw hole are connected to each other.
The screw hole is formed in a different axis. According to the present invention, it is possible to use a valve body in which the position of the through hole must be different due to this off-axis structure.

According to a seventh aspect of the present invention, in the first aspect of the present invention, the valve body with the screw hole has the same diameter as the through hole of the connected member. It is characterized in that another member having the first screw hole and the second screw hole is fitted into the through hole. According to this invention, after forming the through holes uniformly in all of the connected members,
By fitting the separate member into the through-hole portion of the main body of one directional switching valve, the valve main body with the screw hole can be formed, so that its manufacture is simple.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a multiple direction switching valve according to the present invention will be described below in detail with reference to FIG. The multiple direction switching valve has a supply / discharge port main body member 7 disposed at one end. The supply / discharge port main body member 7 includes a tank port 3 connected to the hydraulic tank 1 via the pipe 2 and a pump port 6 connected to the hydraulic pump 4a via the pipe 5. Starting from the supply / discharge port main body member 7,
The first directional control valve 8, the second directional control valve 9, the third directional control valve 10, the fourth directional control valve 11, and the fifth directional control valve 1 in order.
2 and fly one, and the sixth directional control valve 13,
The seventh direction switching valve 14 and the eighth direction switching valve 15 are arranged. The fifth directional switching valve 12 and the sixth directional switching valve 13
The supply port main body 17 connected to the hydraulic pumps 4b and 4c via the pipe 16 is disposed between the supply port main body 17 and the supply port main body 17.

The connected member composed of the supply / discharge port main body member 7, the first directional switching valves 8 to 8 and the supply port main body 17 is adjacent to each other by four first connecting bolts 18 in the above order. They are tightly joined together and connected together. That is, the valve body 19 of the eighth directional control valve 15 located on the other end side has the first connecting bolt 1 on its joint surface.
8 is provided with a first screw hole 20 into which the distal end is screwed, and a through hole 21 through which the first connecting bolt 18 passes is provided in the main body of the other connected members (reference numerals 7-14). The first connection bolt 18 is screwed into the first screw hole 20 of the eighth directional switching valve 15 through the through hole 21 of another connected member (reference numerals 7 to 14) to thereby connect the connected member. (Symbol 7-
15) is integrally connected. Reference numeral 22 indicates a connecting nut.

[0015] The connected member (symbols 7 to 15 and 17)
Has a supply passage, an unload passage, and a tank passage (not shown), and the passages extend in the direction in which the connected members are arranged in parallel with each other. In this embodiment, the first directional switching valve 8 to the eighth directional switching valve 15 are any of a traveling switching valve, a turning switching valve, a boom switching valve, an arm switching valve, a bucket switching valve, and the like. A combination of two actuator ports 23, 24 each
have. And the actuator ports 23, 2
Via 4, it is connected to a traveling motor, a turning motor, a boom cylinder, an arm cylinder, etc. (not shown) which are actuators of an industrial machine.

Further, the eighth directional control valve 15 is provided with a second screw hole 25 on the other surface of the valve body 19, and a second connection bolt 26 is screwed into the second screw hole 25. Thus, another connected member can be integrally connected. In the embodiment shown in FIG. 1, the second connecting bolt 2
6, the cover 27 is joined to the eighth directional control valve 15, and the cover 27 allows the supply passage (not shown) to be connected.
Is cut off at the other end, and has a communication groove (not shown)
Thereby, the unload passage and the tank passage (not shown) communicate with each other via the communication groove portion in the cover 27. The shape of the cover 27 is formed according to the circuit configuration of the multiple direction switching valve, and communicates or blocks each passage. In this embodiment, as shown in an enlarged manner in FIG. 3, the first screw hole 20 into which the first connection bolt 18 is screwed and the second screw hole 25 into which the second connection bolt 26 is screwed.
Are formed independently and coaxially in the valve body 19 in a non-penetrating state.

Next, the operation of the multiple direction switching valve according to the above embodiment will be described. In this embodiment, the eighth directional control valve (reference numerals 8 to 15), which is one of eight
Since the directional control valve 15 is located at the other end, for example, the position of the supply port main body 17 and the like can be freely determined so as to reduce the flow resistance. Regarding 13), it is still possible to arrange the same operation and the same operation speed at the position where the flow resistance is the same. Therefore, the degree of freedom in determining the order of arrangement is increased, and it is easy to determine an appropriate order.

Further, according to the present embodiment, if necessary, the valve body 1 of the eighth directional control valve 15 disposed on the other end side.
9, a discharge port body 29 and a directional control valve 32 can be easily added via a second connection bolt 26 (a bolt longer than that shown in FIG. 1), as shown in FIG. It is. The tank port 30 of the discharge port main body 29 is connected to the hydraulic tank 1 via a pipe 31. The embodiment shown in FIG. 2 uses the multiple direction switching valve according to the present invention for an industrial machine having a large capacity actuator such as a breaker. Port bodies 29 are added in pairs. The valve body and the discharge port body 29 of the additional directional control valve 32 are provided with the second connection bolt 2.
A through hole 33 through which 6 passes is provided similarly to the through hole 21. By adding the additional directional control valve 32 and the discharge port main body 29 as a pair in this manner, the flow resistance when discharging the pressurized oil to the hydraulic tank 1 can be reduced, and as a result, the flow rate of the pressurized oil can be increased. The operating speed of an actuator such as the breaker can be increased. Therefore, it is possible to sufficiently exhibit the performance of a large-capacity actuator.

The first screw hole 20 and the second screw hole 25
Are formed independently and coaxially, the pitch of the two screw holes 20 and 25 can be formed only at the portion where the two connecting bolts 18 and 26 are screwed together by this independent formation. Processing can be facilitated. In other words, the longer the screw hole, the more likely it is to bend,
Although an apparatus for preventing this and further measures are required separately, according to this embodiment, such a need does not occur. Further, with the coaxial structure of the first screw hole 20 and the second screw hole 25, the same type of main body can be used as an additional connected member, and versatility is increased.

FIG. 4 is a sectional view showing a main part of another embodiment of the present invention. In this embodiment, the first screw hole 20 and the second screw hole 25 are formed through the valve body 19 of the eighth directional control valve 15. The other configuration is the same as that of the above embodiment, and the description thereof is omitted. According to the present embodiment, since the first screw hole 20 and the second screw hole 25 penetrate the valve body 19, the pitch between the two screw holes 20 and 25 can be reduced from only one direction of the valve body 19. It is possible to form, and thus the number of processing steps can be reduced.

FIG. 5 is a cross-sectional view of a principal part showing another embodiment of the present invention. In this embodiment, the first screw hole 20 and the second screw hole 25 are formed on different axes. The other configuration is the same as that of the above embodiment, and the description thereof is omitted. According to the present embodiment, the through-hole 21 on the first connecting bolt side and the second
It is possible to use a main body in which the position of the through hole 33 on the connection bolt side must be different, and from this point, versatility is improved.

FIG. 6 is a cross-sectional view of a principal part showing another embodiment of the present invention. In this embodiment, the screw hole 2
The valve body 19 with 0, 25 is provided with two screw holes 20, 25 in a through hole 35 having the same diameter as the through holes 21, 33 of the connected member.
Is fitted with another member 34 having In this example, a large-diameter portion 36 is further formed in the through hole 35 on the first screw hole 20 side, and is formed so as not to fall out to the second screw hole 25 side by the step 37. According to the present embodiment,
After uniformly forming the through holes 21 and 33 in all of the connected members, only one of the eighth directional control valves 15 has the valve body 19.
By inserting another member 34 into the through hole 35,
Since the valve body 19 with the screw hole can be formed, its manufacture is simple.

According to the present invention, the connected member other than the directional control valve is not located at the other end, and one directional switch valve is located at the other end. In the order of arranging the connected members constituting the directional control valve, there is a high degree of freedom in which an appropriate order can be selected from the viewpoint of the flow resistance, the operation speed, and the like. It is to provide a directional control valve.

[Brief description of the drawings]

FIG. 1 is a front view showing a cross section of a main part of a multiple direction switching valve according to an embodiment of the present invention.

FIG. 2 is a front view showing a main part in a cross section for explaining the operation of the embodiment of the present invention.

FIG. 3 is an enlarged sectional view of a main part of one embodiment of the present invention.

FIG. 4 is an enlarged sectional view of a main part showing another embodiment of the present invention.

FIG. 5 is an enlarged sectional view of a main part showing still another embodiment of the present invention.

FIG. 6 is an enlarged sectional view of a main part showing still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic tank material 2 Piping 3 Tank port 4 Hydraulic pump 5 Piping 6 Pump port 15 8th direction switching valve 18 1st connection bolt 19 Valve main body 20 1st screw hole 21, 33 through hole 25 2nd screw hole 26 2nd Connection hole 27 Cover 29 Discharge port main body 32 Additional direction switching valve 34 Separate member

Claims (7)

[Claims] A spool is slidably inserted into a valve body, and a plurality of directional control valves are provided for controlling a flow rate and a flow direction of pressure oil to an actuator by sliding of the spool. A multiple direction switching valve in which a plurality of connected members including a switching valve are sequentially arranged from one end side to the other end side, and are closely connected to each other by a first connection bolt and are integrally connected. As the arrangement of the connected members, on the other end side,
One directional control valve is disposed, and a valve body of the directional control valve located at the other end side is provided with a first screw hole into which a tip end of the first connection bolt is screwed with a joint surface thereof. The other body of the other connected member is provided with a through-hole through which the first connecting bolt passes, and the first connecting bolt is inserted through the through-hole of the other connected member to form the other The connected member is integrally connected by screwing into the first screw hole of the direction switching valve on the end side, and the other surface of the valve body of the direction switching valve on the other end side is also connected to the other surface. 2
A multi-directional directional control valve, wherein a screw hole is provided, and another connected member is formed so as to be integrally connected by screwing another second connection bolt into the second screw hole. . 2. A tank member connected to a hydraulic tank via a pipe and a hydraulic pump connected to a connected member integrally connected by a first connecting bolt via a pipe. A direction switching valve disposed on the other end side includes a supply / discharge port main body member provided with a pump port, and the direction switching valve includes a traveling switching valve, a turning switching valve, a boom switching valve, an arm switching valve, and a bucket switching valve. A multi-way directional control valve characterized in that it is one of the above. 3. The multi-unit according to claim 1, wherein the first screw hole and the second screw hole are formed through the valve body of the directional control valve on the other end. Directional valve. 4. The valve according to claim 1, wherein the first screw hole and the second screw hole are independently formed in the valve body of the direction switching valve on the other end side in a non-penetrating state. Multiple directional control valve. 5. The multiple direction switching valve according to claim 4, wherein the first screw hole and the second screw hole are formed coaxially. 6. The multiple direction switching valve according to claim 4, wherein the first screw hole and the second screw hole are formed on different axes. 7. The valve body with a screw hole according to claim 1, wherein another member having the screw hole is fitted into a through hole of the same diameter as the through hole of the connected member. A multiple direction switching valve characterized by the following.