JP2000046208A - Shuttle valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the management and assembling property of components and to improve the liquid sealability in a shuttle valve device. SOLUTION: In this shuttle valve device, a first non-return valve 37 is cartridge-fitted in a first valve case 53, a second non-return valve 38 is cartridge- fitted in a second valve case 58 integrated with a spool holder 39, the first valve case 53 and the second valve case 58 adjacent to each other are fitted to a valve storage hole 37, and covered by a plug 62.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a shuttle valve device suitable for use in a hydraulic circuit such as a tilt / trim device for a marine propulsion device.

[0002]

2. Description of the Related Art Conventionally, a hydraulic circuit such as a tilt / trim device for a marine propulsion device uses a shuttle valve device interposed between a hydraulic oil supply / discharge device and a hydraulic actuator to control the flow of hydraulic oil. I have.

[0003] The shuttle valve device is housed in a valve storage hole provided in a valve box, has a first check valve and a second check valve arranged on both sides of a spool, and has a space between the spool and the first check valve. A first shuttle chamber is formed, a second shuttle chamber is formed between the spool and the second check valve, and the first check valve is opened by the supply pressure applied to the first shuttle chamber, and the spool is closed. The second check valve is opened by sliding, the second check valve is opened by the feed pressure applied to the second shuttle chamber, and the spool is slid to open the first check valve. I have.

[0004]

However, the prior art has the following problems. The shuttle valve device includes a spool, a first check valve, and a second check valve. The spool includes a spool holder that slidably accommodates the spool and a first check valve. The valve includes a valve body, a spring for biasing the same, and a spring retainer for the spring. The second check valve also includes a valve body, a spring for biasing the same, and a spring retainer for the spring. It has difficulties in parts management.

[0005] A large number of parts are assembled in the small hole of the valve housing hole, and the parts assemblability is poor.

The shuttle valve device is interposed between a plurality of hydraulic oil passages provided between the hydraulic oil supply / discharge device and the hydraulic actuator. Alternatively, it is necessary to manage a large number of seal portions so that the fitting portion between the components does not impair the liquid sealing property between the plurality of hydraulic oil flow paths, which is troublesome.

SUMMARY OF THE INVENTION It is an object of the present invention to improve the management and assembly of components in a shuttle valve device, and to improve the liquid sealing performance.

[0008]

According to the first aspect of the present invention, a first check valve and a second check valve are stored in a valve storage hole provided in a valve box, and a first check valve and a second check valve are arranged on both sides of a spool. A first shuttle chamber is formed between the spool and the first check valve, and the first shuttle chamber is formed between the spool and the second check valve.
A second shuttle chamber is formed between the first shuttle chamber and the check valve. The first check valve is opened by the oil supply pressure applied to the first shuttle chamber, and the spool is slid to open the second check valve. In the shuttle valve device which opens the first check valve by sliding the spool while opening the second check valve by the oil supply pressure applied to the second shuttle chamber, the first check valve is connected to the first valve case. The second check valve is formed into a cartridge, and the second check valve is formed into a cartridge in a second valve case integrated with a spool holder for slidably storing the spool. The first valve case is inserted into the valve storage hole from the opening of the valve storage hole. And the second valve case are fitted adjacent to each other, and the opening of the valve storage hole is closed by a plug.

[0009]

According to the first aspect of the present invention, the following:
Has the effect of In the shuttle valve device, the first valve case, in which the first check valve is made into a cartridge, and the second valve case, in which the second check valve is made into a cartridge and a spool is housed, can be fitted into the valve storage hole. , The assemblability of the shuttle valve device can be facilitated.

The components of the first check valve are housed in the first valve case to form a cartridge, and the components of the second check valve and the spool are housed in the second valve case to form a cartridge. Moreover, since the spool valve holder is integrated with the second valve case to make the second check valve and the spool a single cartridge, the cartridge portion of the second check valve and the cartridge portion of the spool (spool holder) are separated. The number of cartridges could be reduced as compared to the case of separate products. Therefore, despite the fact that the shuttle valve device is made up of a large number of separate parts, parts can be easily managed with a small number of cartridges. Also, even if the shuttle valve device fails, it is sufficient to replace only the failed cartridge part,
Maintenance of the shuttle valve device can also be facilitated.

[0011] The liquid sealing property between the plurality of hydraulic oil flow paths is ensured by the fitting seal portion between the valve housing holes of the first valve case and the second valve case. Here, the second valve case is directly fitted in the valve storage hole, and is not fitted like a separate valve holder fitted in the valve storage hole, but like the second valve case and the valve holder. There is no fitting seal between the components.
Therefore, when securing the liquid sealing property between the plurality of hydraulic oil flow paths, the number of control points of the seal portions between the components can be reduced, and the liquid sealing property can be improved.

[0012]

FIG. 1 is a schematic diagram showing an outboard motor to which the present invention is applied, FIG. 2 is a schematic diagram showing a tilt / trim device of FIG. 1, and FIG. 3 is a hydraulic circuit diagram of the tilt / trim device. , FIG.
Is a schematic diagram showing a shuttle valve device of the first embodiment, FIG. 5 is a schematic diagram showing a first valve case and a first check valve, FIG. 6 is a schematic diagram showing a second valve case and a second check valve, FIG. 7 is a schematic diagram showing a shuttle valve device of the second embodiment, FIG. 8 is a schematic diagram showing a shuttle valve device of the third embodiment, and FIG. 9 is a schematic diagram showing a modification of the first check valve.

(First Embodiment) (FIGS. 1 to 5) As shown in FIG. 1, an outboard motor 10 as a marine propulsion device is provided.
The propulsion unit 13 including the propeller 11 and the engine 12 is supported by a swivel bracket 14 so as to be able to swing horizontally, and the swivel bracket 14 is supported by a clamp bracket 15 so as to be tiltable in the vertical direction. is there. The clamp bracket 15 grips the hull 16,
By being fixed to the hull 16, the propulsion unit 1
Numeral 3 is capable of swinging in the horizontal direction with respect to the hull 16 and capable of tilting in the vertical direction. Propeller 1 of this outboard motor 10
1 is rotated in the forward and reverse directions by the engine 12 and the hull 1
6 moves forward or backward.

A tilt / trim device 17 is provided between the swivel bracket 14 and the clamp bracket 15 of the outboard motor 10.
Is installed. The expansion and contraction of the tilt / trim device 17 causes the propulsion unit 13 of the outboard motor 10 to tilt or trim. The trim operation adjusts the angle of the propulsion unit 13 against the thrust of the propeller 11 while the hull 16 is sailing, and changes the sailing attitude of the hull 16. In the tilt operation, the propulsion unit 13 is tilted against its own weight when the ship is stopped or when the hull 16 is lifted up on land, and the propulsion unit 13 is raised above the water surface.

The tilt / trim device 17 is shown in FIGS.
As shown in the figure, the hydraulic cylinder device 18, the pump device 19
And a tank device 20. These hydraulic cylinder device 18, pump device 19 and tank device 20
Are placed together as a unit. That is,
Cylinder 21 of hydraulic cylinder device 18, pump device 19
Of the tank device 20 of the tank device 20 are integrally formed.

As shown in FIG. 3, the hydraulic cylinder device 18 has a piston 21 and a free piston 3
Numeral 0 is slidably disposed, and a piston rod 25 connected to the piston 24 extends through a rod guide 26. The rod guide 26 closes the opening of the cylinder 21 so that the inside of the cylinder 21 is liquid-tight. Further, the inside of the cylinder 21 is partitioned into a lower chamber 27A and an upper chamber 27B by the piston 24 and the free piston 30.

A shaft support 28 (FIG. 2) is formed on the cylinder 21 of the hydraulic cylinder device 18, and the cylinder 21 is supported by the clamp bracket 15 via the shaft support 28.
A shaft support 29 is provided at the tip of the piston rod 25 of the hydraulic cylinder device 18, and the shaft support 29 is supported by the swivel bracket 14. Therefore, when hydraulic oil is supplied from the pump device 19 in FIG. 3 to the lower chamber 27A or the upper chamber 27B of the hydraulic cylinder device 18, the hydraulic cylinder device 18 expands and contracts, that is, the piston rod 25 projects from the cylinder 21 (hydraulic cylinder). The device 18 expands), or the piston rod 25 is stored in the cylinder 21 (the hydraulic cylinder device 18 contracts).

As shown in FIG. 2, the pump device 19 has a pump section 32 in which a gear pump 31 is accommodated in a manifold 22, and a motor section 33 for driving the gear pump 31 to rotate in one of forward and reverse directions. Be composed. Pump part 3
In the second manifold 22, an oil sump chamber 34 is formed above the gear pump 31, and the oil sump chamber 34 is connected to the communication passage 35.
Through the tank case 23 of the tank device 20. The communication passage 35 is formed by continuously drilling the cylinder 21, the manifold 22, and the tank case 23. Further, a shuttle valve device 36 described later is disposed in the manifold 22 as a valve box. Reference numeral 52 in FIG. 2 denotes an electric wire for supplying power to the motor unit 33.

The gear pump 31 of the pump device 19 is shown in FIG.
As shown in the figure, the first lower chamber side flow path 41, the shuttle valve device 3
6, through the lower chamber side check valve 37 and the second lower chamber side flow path 42,
The hydraulic cylinder device 18 is connected to the lower chamber 27A. The gear pump 31 includes a first upper chamber side flow path 43, an upper chamber side check valve 38 of the shuttle valve device 36, and a second upper chamber side flow path 44.
And is connected to the upper chamber 27B of the hydraulic cylinder device 18. Further, the gear pump 31 is connected to the oil sump chamber 34 via the first oil sump flow path 45 and the second oil sump flow path 46, respectively, and is connected to the tank device 20 via the communication passage 35 (FIG. 2).

As shown in FIGS. 3 and 4, the shuttle valve device 36 includes the lower chamber-side check valve 37 as a first check valve and the upper chamber as a second check valve on both sides of a spool 36S. Side check valves 38 are provided, respectively, and the spool 36S is slidably accommodated in a spool holder 39.
A pressing portion 40 that presses the lower chamber check valve 37 and the upper chamber check valve 38 respectively at both ends of the spool 36S to open the valve.
A and 40B are protruded. The spool 36S is provided between the lower chamber check valve 37 and the upper chamber check valve 38 between the lower chamber oil chamber 39A (first shuttle chamber) and the upper chamber oil chamber 39B.
(The second shuttle room).

Therefore, when the gear pump 31 rotates forward, the gear pump 31 transfers the hydraulic oil in the oil sump chamber 34 and the tank device 20 to the first oil sump flow path 45 and the first lower sump as shown by the solid arrows in FIG. Shuttle valve device 3 via chamber side flow path 41
6 into the lower chamber 39A. The hydraulic oil guided into the lower chamber-side oil chamber 39A opens the lower chamber-side check valve 37 and presses the spool 36S toward the upper chamber-side oil chamber 39B.
The upper chamber-side check valve 38 is opened by the pressing portion 40B. By opening the lower chamber side check valve 37, the hydraulic oil in the lower chamber side oil chamber 39A is turned into the second lower chamber side flow path 42 as shown by a solid line arrow in FIG.
The hydraulic oil in the upper chamber 27B flows through the second upper chamber side flow path 44 and the upper chamber check valve 3
8 (in a valve-open state) and the first upper chamber side flow path 43 and are guided to the gear pump 31. As a result, the piston 24 and the free piston 30 move in the direction in which the piston rod 25 of the hydraulic cylinder device 18 protrudes from the cylinder 21 to extend the hydraulic cylinder device 18, and the propulsion unit 1 of the outboard motor 10
3 is operated for trim up and tilt up.

Also, when the gear pump 31 rotates in the reverse direction, the gear pump 31 transfers the hydraulic oil in the oil sump chamber 34 and the tank device 20 to the second oil sump flow path 46 and the first oil sump as shown by the dashed arrow in FIG. The shuttle valve device 36 is guided to the upper chamber oil chamber 39B via the upper chamber channel 43. This upper chamber side oil chamber 39B
The hydraulic oil guided inside opens the upper chamber check valve 38, moves the spool 36S in the direction of the lower chamber oil chamber 39A, and pushes the lower chamber check valve 37 at the pressing portion 40A. Open the valve. The hydraulic oil in the upper chamber-side oil chamber 39B reaches the upper chamber 27B of the hydraulic cylinder device 18 via the second upper chamber-side flow path 44 as shown by a broken arrow in FIG. The oil is returned to the gear pump 31 via the second lower chamber-side flow path 42, the lower chamber-side check valve 37 (opened state), and the first lower chamber-side flow path 41. As a result, the piston rod 25
The piston 24 moves in the direction of being housed in the hydraulic cylinder device 1 and the hydraulic cylinder device 18 contracts, and the propulsion unit 13 of the outboard motor 10
Is operated to tilt down and trim down.

In the hydraulic circuit of the tilt / trim device 17 described above, a down blow valve 47 is connected to the upper oil chamber 39B of the shuttle valve device 36, and an up blow valve is connected to the lower oil chamber 39A of the shuttle valve device 36. 48 are arranged,
Further, a thermal blow valve 49 and a manual valve 50 are connected to a communication channel 51 that connects the second lower chamber side channel 42 and the second upper chamber side channel 44. The down blow valve 47, the up blow valve 48, the thermal blow valve 49 and the manual valve 50 are disposed in the manifold 22 together with the shuttle valve device 36.

The down blow valve 47 guides hydraulic oil equivalent to the volume of the piston rod 25 entering the cylinder 21 into the tank device 20 through the oil reservoir chamber 34 when the hydraulic cylinder device 18 contracts. When the hydraulic cylinder device 18 is extended, the up blow valve 48
4 is in contact with the rod guide 26, the gear pump 3
When 1 is rotating forward, excess hydraulic oil is guided into the tank device 20 via the oil reservoir 34.

When the volume of hydraulic oil in the lower chamber 27A and the second lower chamber side flow path 42 of the hydraulic cylinder device 18 increases due to a temperature change, the thermal blow valve 49 stores the increased hydraulic oil in the oil reservoir. It escapes to the tank device 20 through the chamber 34. Further, the manual valve 50 is connected to the propulsion unit 1.
In the event of a malfunction of the hydraulic cylinder device 3, the lower chamber 27A and the upper chamber 27 of the hydraulic cylinder device 18 are manually opened by the operator.
The hydraulic oil in B is communicated with the tank device 20 through the oil sump chamber 34 so that the propulsion unit 13 can be manually tilted up and down.

As shown in FIG. 4, the lower check valve 37 of the shuttle valve device 36 is, as shown in FIG.
Lower chamber side valve element 5 is provided in lower chamber side valve case 53 as a valve case.
The lower chamber-side valve element 54 is configured to be opened and closed by being urged by a spring 56 supported by a spring retainer 55. The spring retainer 55 is pressed into the fitting portion of the valve case 53 with an outer diameter. The lower chamber side valve element 54, the spring retainer 55, and the spring 56 are built in the lower chamber side valve case 53, formed into a cartridge, and removably housed in the valve storage hole 57 of the manifold 22. At this time, the O-ring 53A mounted on the outer periphery of the valve case 53 liquid seals the valve storage hole 57 between the first lower chamber side flow path 41 and the second lower chamber side flow path 42.

The lower chamber check valve 37 can be modified like a lower chamber check valve 37A shown in FIG. Lower chamber side check valve 37A
Is formed by pressing the spring retainer 55A into the fitting portion of the valve case 53 with an inner diameter.

The upper chamber check valve 38 of the shuttle valve device 36
As shown in FIG. 6, similar to the lower chamber check valve 37, the second
The upper chamber side valve element 5 is provided in the upper chamber side valve case 58 as a valve case.
The upper chamber-side valve element 59 is slidably disposed, and is configured to be opened and closed by being urged by a spring 61 supported by a spring retainer 60. The upper chamber side valve body 59, the spring retainer 60 and the spring 61 are built in the upper chamber side valve case 58 to form a cartridge, and the valve housing hole 57 of the manifold 22 is provided.
It is removably housed inside. At this time, the upper chamber side valve case 58 is integrated with the above-mentioned spool holder 39 for slidably storing the spool 36S and is made into a single component.

The spool 36S of the shuttle valve device 36 is
As described above, the upper chamber side valve case 5 is slidably disposed in the spool holder 39 integrated with the upper chamber side valve case 58.
8 into a cartridge, manifold 2
It is detachably accommodated in the second valve storage hole 57. At this time, the O-rings 39C and 58A mounted on the outer periphery of the spool holder 39 and the outer periphery of the upper chamber side valve case 58 respectively move between the first lower chamber side flow path 41 and the first upper chamber side flow path 43,
The valve housing hole 5 is provided between the upper chamber side flow path 43 and the second upper chamber side flow path 44.
7 is liquid-sealed. And, in this spool holder 39,
A lower chamber-side communication path 64 that connects the lower chamber-side oil chamber 39A and the first lower chamber-side flow path 41 is formed, and also connects the upper chamber-side oil chamber 39B and the first upper chamber-side flow path 43. An upper chamber side communication passage 65 is formed.

The shuttle valve device 36 is connected to the manifold 22.
The lower chamber-side check valve 3 cartridged into the lower chamber-side valve case 53 from the opening of the valve storage hole 57 into the valve storage hole 57.
7. The upper chamber side check valve 38 and the spool 36S, which are made into cartridges, are fitted into the upper chamber side valve case 58 so as to be adjacent to each other, and the plug 62 is screwed into the opening of the valve storage hole 57 so as to be screwed into the lower chamber. The side valve case 53 and the upper chamber side valve case 58 are pressed and held in the valve storage hole 57. At this time, the O-ring 62A mounted on the outer periphery of the plug 62 liquid seals the valve storage hole 57 on the outer side of the second upper chamber side flow path 44. The plug 62 is formed with a plug communication passage 63 that communicates the upper chamber check valve 38 with the second upper chamber flow path 44.

Therefore, according to the present embodiment, the following operations are provided. The shuttle valve device 36 includes a lower chamber-side valve case 53 in which the lower chamber-side check valve 37 is made into a cartridge, and an upper chamber-side valve case 58 in which the upper chamber-side check valve 38 is made into a cartridge and the spool 36S is stored. Since it is possible to fit into the valve storage hole 57, the assemblability of the shuttle valve device 36 can be facilitated.

The components of the lower chamber check valve 37 are built in the lower chamber valve case 53 to form a cartridge, and the components of the upper chamber check valve 38 and the spool 36S are connected to the upper chamber valve case 5.
8 and made into a cartridge. Moreover, since the upper chamber check valve 38 and the spool 36S are integrated into a single cartridge by integrating the spool holder 39 with the upper chamber valve case 58, the cartridge portion of the upper chamber check valve 38 and the spool 36S The number of cartridges can be reduced as compared with the case where the cartridge portion (spool holder 39) is separately provided. Therefore, even though the shuttle valve device 36 is composed of a large number of separate parts, parts can be easily managed in a small number of cartridges. Further, even if the shuttle valve device 36 fails, it is sufficient to replace only the failed cartridge portion, and maintenance of the shuttle valve device 36 can be facilitated.

The liquid-sealing property between the plurality of hydraulic oil passages 41 to 44 is determined by fitting a sealing portion (O-rings 53A, 39C, 39C) between the lower chamber side valve case 53 and the valve housing hole 57 of the upper chamber side valve case 58. 5
8A, 62A). Here, the upper chamber-side valve case 58 is directly fitted into the valve storage hole 57, and is not fitted like a separate valve holder fitted into the valve storage hole 57. There is no fitting seal between the components such as 58 and the valve holder. Therefore, when securing the liquid sealing property between the plurality of hydraulic oil flow paths 41 to 44,
It is possible to reduce the number of control points of the seal part between the parts and improve the liquid sealing property.

(Second Embodiment) (FIG. 7) The second embodiment is different from the first embodiment in that the up-blow valve 4 having the same function as that described in the first embodiment is used.
8 is incorporated in the spool 36S of the shuttle valve device 36.

That is, in the spool 36S of the second embodiment, as shown in FIGS.
S is divided into two parts in the axial direction.
A spring 72 (spring retainer 73A) is formed in the through hole 71 formed in S.
Can be opened and closed by the valve body 73 of the up-blow valve 48 urged by.

The up blow valve 4 of the second embodiment
In the valve opening operation of 8, the gear pump 31 of the pump device 19 is rotating forward, and the first lower chamber side flow path 41 passes through the lower chamber side oil chamber 39A of the shuttle valve device 36 to the second lower chamber side flow path 42. Under a state where the hydraulic oil flows and the hydraulic oil flows from the second upper chamber side flow path 44 to the first upper chamber side flow path 43 through the upper chamber oil chamber 39B of the shuttle valve device 36, the hydraulic cylinder device 18 Lower room 27A
Occurs when is full. At this time, the spool 36S moves to the upper chamber side check valve 38 side, and the spool 3S
Since the 6S through-hole 71 and the upper chamber side communication passage 65 of the spool holder 39 are located at opposing positions, the hydraulic oil discharged from the gear pump 31 is supplied to the first lower chamber side flow path 41 and the lower chamber side oil chamber 39.
A, the up blow valve 48 is opened, and the through hole 71 is opened.
Through the upper chamber side oil chamber 39B, through the upper chamber side communication passage 65, to the first upper chamber side flow path 43, and returned to the suction side of the gear pump 31.

(Third Embodiment) (FIG. 8) The third embodiment is different from the first embodiment in that the down blow valve 4 having the same function as that described in the first embodiment is used.
7 and the up blow valve 48 are built in the spool 36S of the shuttle valve device 36.

That is, in the spool 36S of the third embodiment, as shown in FIGS.
S is divided into two parts in the axial direction.
S is formed with a through hole 71 formed in a spring 72 (spring retainer 73A,
74A) the valve body 7 of the up blow valve 48 urged in
3. It can be opened and closed by the valve element 74 of the down blow valve 47. The blow pressure of the down blow valve 47 and the up blow valve 48 is adjusted by the ball diameter of the valve body 74 and the valve body 73, and the valve body 74 is made larger in diameter than the valve body 73.
The blow pressure of the down blow valve 47 is set lower than that of the up blow valve 48.

During normal rotation of the gear pump 31 of the pump device 19, the hydraulic oil discharged from the gear pump 31 receives the first lower chamber side flow path 41, the lower chamber side oil chamber 39A, the lower chamber side check valve 37, and the second The lower chamber 2 of the hydraulic cylinder device 18 via the lower chamber side flow path 42
7A, the hydraulic oil in the upper chamber 27B of the hydraulic cylinder device 18 flows through the second upper chamber side flow path 44, the upper chamber side check valve 38, the upper chamber side oil chamber 39B, and the first upper chamber side flow path 43. Gear pump 3
1, when the lower chamber 27A of the hydraulic cylinder device 18 is full, the up blow valve 48 is opened, and the hydraulic oil in the lower chamber-side oil chamber 39A
6S through hole 71, spool body oil hole 75, recess 76,
And a third oil sump flow path 77 via a spool holder oil hole (not shown) of the spool holder 39, and the oil sump chamber 34,
It is led to the tank device 20.

During the reverse rotation of the gear pump 31 of the pump device 19, the hydraulic oil discharged from the gear pump 31
Upper chamber side flow path 43, upper chamber side oil chamber 39B, upper chamber side check valve 38
And flows into the upper chamber 27 </ b> B of the hydraulic cylinder device 18 via the second upper chamber side flow path 44 and the lower chamber 27 of the hydraulic cylinder device 18.
The hydraulic oil in A is supplied to the second lower chamber side flow path 42 and the lower chamber side check valve 3.
7. Flowing to the gear pump 31 through the lower chamber-side oil chamber 39A and the first lower chamber-side flow path 41, when the hydraulic cylinder device 18 is contracted, the down blow valve 47 is opened and the hydraulic cylinder device 18 Hydraulic oil equivalent to the volume of the piston rod 25 that enters the cylinder 21 enters the upper chamber-side oil chamber 3.
9B through through hole 71, spool body oil hole 75, recess 76
And a third oil sump flow path 77 via a spool holder oil hole (not shown) of the spool holder 39, and the oil sump chamber 34,
It is led to the tank device 20.

In the first embodiment, the spool 36
Although the up blow valve 48 is arranged in S, the down blow valve 47 may be arranged in S. In the above embodiment, the case of the tilt / trim device of the outboard motor has been described. However, the present invention can be widely applied to a hydraulic circuit in which the shuttle valve device 36 is used.

[0042]

As described above, according to the present invention, in the shuttle valve device, the management of components and the assembling property can be improved, and the liquid sealing property can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an outboard motor to which the present invention is applied.

FIG. 2 is a schematic diagram showing the tilt / trim device of FIG.

FIG. 3 is a hydraulic circuit diagram of the tilt / trim device.

FIG. 4 is a schematic view showing a shuttle valve device according to the first embodiment.

FIG. 5 is a schematic view showing a first valve case and a first check valve.

FIG. 6 is a schematic diagram showing a second valve case and a second check valve.

FIG. 7 is a schematic view showing a shuttle valve device according to a second embodiment.

FIG. 8 is a schematic view showing a shuttle valve device according to a third embodiment.

FIG. 9 is a schematic view showing a modification of the first check valve.

[Explanation of symbols]

 22 Manifold (valve box) 36 Shuttle valve device 36S Spool 37, 37A Lower chamber check valve (first check valve) 38 Upper chamber check valve (second check valve) 39 Spool holder 39A Lower chamber oil Chamber (first shuttle chamber) 39B Upper chamber side oil chamber (second shuttle chamber) 53 Lower chamber side valve case (first valve case) 57 Valve storage hole 58 Upper chamber side valve case (second valve case) 62 Plug

Claims (1)

[Claims] A first check valve and a second check valve which are housed in a valve storage hole provided in a valve box and are disposed on both sides of a spool, and wherein a first shuttle is provided between the spool and the first check valve; A second shuttle chamber is formed between the spool and the second check valve, and the oil supply pressure applied to the first shuttle chamber opens the first check valve and slides the spool. A second check valve is opened by the oil supply pressure applied to the second shuttle chamber to open the second check valve, and the spool is slid to open the first check valve. The check valve is made into a cartridge in a first valve case, and the second check valve is made into a cartridge in a second valve case integrated with a spool holder that slidably accommodates a spool. The first valve case and the second valve case are
A shuttle valve device, wherein a valve case is fitted adjacently, and an opening of the valve storage hole is closed with a plug.