JPS5818540B2 - Nagasachi Yousei Shiki Gas Spring - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a length-adjustable gas spring in which the amount of protrusion of a rod protruding from a cylinder can be arbitrarily set.

Conventionally, in a length-adjustable gas spring in which a piston with a rod connected to the gas spring body is provided, and pressure chambers filled with compressed gas are provided on both sides of the piston, in order to fill the pressure chamber with compressed gas, it is necessary to A method of forming a hole in the spring body toward the pressure chamber, filling the hole with compressed gas in a nitrogen gas atmosphere, and then plugging the hole with electric resistance welding has been considered.

However, this method requires steps such as drilling special holes and welding, and the adverse effect on the sealing part due to the heat generated during electrical resistance welding cannot be ignored.

Additionally, if the gas in the pressure chamber gradually leaks to the outside through the seal, the hole must be re-drilled and the compressed gas filled in, which poses a maintenance problem for length-adjustable gas springs. He also left a mark.

The present invention solves the above-mentioned problems, and even if the compressed gas in the pressure chamber leaks to the outside from the seal part, the gas can be filled immediately without having to process any holes in the gas spring body. Even when initially filling gas into the pressure chamber, it is characterized in that it can be easily filled by simply manipulating the single pulp without going through any hole drilling or welding steps.

In FIG. 1, the inside of a cylinder 1 of a gas spring main body M is divided into pressure chambers A and B by a piston 2, and a rod 3 connected to the piston 2 is passed through the inside of the pressure chamber B and extended to the outside of the cylinder 1. .

An outer tube 4 is provided concentrically on the circumference of the cylinder 1, and a detour chamber C is formed between the cylinder 1 and the outer tube 4.

Further, the open end of the cylinder 10 on the rod side is closed with the end plate 5, and the open end of the outer cylinder 4 on the rod side is closed with the end plate 6.
A through hole 7 is provided to communicate the pressure chamber B and the detour chamber C.

Note that the rod 3 passes through the end plate 56 and extends outward.

In the figure, 8 is a seal ring that maintains airtightness.

Further, the other open end of the cylinder 1 and the outer cylinder 4 is closed by the valve body 9.

The valve body 9 is equipped with a valve structure, and as shown in FIG. A branched communication hole 11 is provided in the valve body 9, and the pressure chambers A and C are communicated through the communication hole 11.

That is, the through hole 10 and the communication hole 11 constitute a detour path that communicates the pressure chamber A and the detour chamber C.

A recess 12A is formed by counterboring the openings at both ends of the through hole 100,
12B, and seal rings 13A and 13B are fitted into the recesses 12A and 12B, respectively.

The inner peripheral surfaces 13A' and 13B/ of 13B are connected to the through hole 1
Make it within 0.

Then, inside the through hole 10 ((insert the pin valve 14,
A shaft portion 14 with a large diameter is provided at the end of the pin valve 14 on the pressure chamber A side.
A is provided, and the shaft portion 14A of the pin valve 14 is brought into pressure contact with the inner peripheral surface 13A' of the seal ring 13A, thereby cutting off communication between the pressure chamber A and the bypass chamber C.

With this configuration, the seal ring 13A has a pin pal 7"
The shaft portion 14A of No. 14 functions as a valve seat.

Also, the pin valve 1 on the opposite side from the end where the shaft portion 14A is formed.
A shaft portion 14B having a large diameter is formed at the fourth end, and the shaft portion 14B is pressed against the inner circumferential surface 13B' of the seal ring 13B, thereby cutting off communication between the pressure chamber A and the outside.

The further distal side of the pin valve 14 formed with the shaft portion 14B is extended to the outside as a small diameter portion 14d.

A shaft portion 14C with a small diameter is formed between the shaft portions 14A and 14B, and the shaft portion 14B is longer than the length of the shaft portion 14A, thereby pushing the pin valve 14 into the pressure chamber A side. However, the shaft portion 14B is the inner peripheral surface 13B of the seal ring 13B.
The pin valve 14 is further moved so that the circumferential surface of the shaft portion 14A is separated from the inner circumferential surface 13A/ of the seal ring 13A so that the pressure chamber A and the detour chamber C are in communication with each other. Push it toward the pressure amount A side to separate the shaft portion 14B from the inner circumferential surface 13B/ of the seal ring 13B, and
B does not cross the seal ring 13, and the small diameter portion 14d
is located at the position of the seal ring 13B, and the pressure chamber A is configured to communicate with the outside via the through hole 10.

Note that when the through hole 10 is closed, the pin valve 14 is urged outward by the gas pressure in the pressure chamber A, and 1□5 is a stopper for preventing the pin valve 14 from being removed.

Further, the shaft portions 14A and 14B have a diameter smaller than that of the hole 10.

16 is an operation ring of the pin valve 14, which is inserted into the valve body 90 through hole 1.
The pin valve 14 is slidably and removably inserted into a hole 17 connected to the outside of the valve 1 with a step 9a as a boundary.
It is fitted into the small diameter portion 14d of.

The lower end of the operating ring 16 abuts against the shoulder 14e of the pin valve 14 so that it can be pushed in.

Hereinafter, the action of the gas spring according to the present invention will be explained.

To adjust the length, as shown in Fig. 2, push the pin valve 14 into the pressure chamber A against the gas pressure in the pressure chamber A via the lock control rod 16, and the shaft with a large diameter will be adjusted. The shaft portion 14A, whose portion 14A is separated from the inner circumferential surface 13A' of the seal ring 13A and has a large diameter, moves into the pressure chamber A, and as a result, the pressure chambers A and B are made up of a through hole 10 and a communication hole 11. The detour and the detour chamber C communicate with each other and have the same pressure.

In this case, the inner end of the operating frame 16 is held by the stepped portion 9a to prevent the shaft portion 14b of the tehimba) v pull 4 from being pushed in too far, which would cause it to separate from the seal ring 13 and lose its sealing effect with the atmosphere. be done.

Therefore, since the rod and the cylinder 3 are located in the pressure chamber B, there is a difference in force between the front and rear of the piston 20, and the rod 3 and the cylinder 1 extend mutually.

Furthermore, when a force greater than the rod reaction force is applied, the rod 3 and cylinder 1 are mutually displaced in the direction of contraction.

After setting the length, remove the force applied to the pin valve 14. The shaft portion 14A, which has a large diameter and protrudes outward until it is received by the seal ring 13A.
The inner peripheral surface 13A/ of the pressure chamber A and the detour chamber C are pressed against each other, and communication between the pressure chamber A and the bypass chamber C is cut off.

The gas spring main body M can be maintained for an arbitrary length.Next, the platform in which compressed gas is sealed will be explained.

As shown in FIG. 3, in a gas atmosphere, the pin valve 14 is replaced with the operating ring 16, gripped by the gas filling chuck 20, and pushed into the pressure chamber A to increase the diameter of the shaft 1.
4B is separated from the inner circumferential surface 13B' of the seal ring 13B, and the large-diameter shaft portion 14A is separated from the inner circumferential surface 13A' of the seal ring 13A, thereby communicating the through hole 10, that is, the detour with the outside.

Thereby, the pressure chamber A and the detour chamber C are communicated with the outside via the detour, and the compressed gas in the gas atmosphere is filled into each chamber through the detour.

After each chamber A, B, and C is filled with compressed gas, when the pin valve 14 is pulled out to the outside through the chuck 20, the shaft portion 14B is pressed against the inner circumferential surface 13B' of the seal ring 13B, and the inside and outside are brought into contact with each other. Communication between the two is cut off.

In this state where the pin valve 14 shuts off the outside and the inside, the pin valve 14 is always pushed outward by the internal gas pressure, and the stopper 15 is held in contact with the seal retainer 13'. Ru.

As described above, the present invention uses the length adjustment valve device also as a gas filling valve mechanism, so there is no need for a dedicated mechanism for gas filling, and moreover, when filling compressed gas, holes are formed. Processes such as caulking and welding for opening and closing are no longer necessary.

Also, since this is different from the method of sealing gas by welding, there is no heat effect on seal rings, etc.

In addition, the work can be easily carried out when there is insufficient gas filling or when it is desired to change the gas reaction force.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the gas spring of the present invention, Figures 2 and 3 are partially enlarged cross-sectional views of the valve structure, Figure 2 is a diagram of the valve in its open state for length adjustment, and Figure 3 is a diagram of the gas spring filled with gas. Or, this is a diagram with the valve open for extraction.M...Gas spring body, 1...Cylinder, 2...Piston, 3...Rod , 4...outer cylinder, 9...09. Operating ring, 9a
...Stepped portion, 10...Through hole, 11...
...Communication hole, 14...Pin valve, A, B
...Pressure chamber, C...Detour chamber.

Claims (1)

[Claims] 1 A cylinder is arranged with a gap inside the outer cylinder, and a valve body having a through hole with a reduced diameter with a stepped part is attached to one end of the outer cylinder and the cylinder, and a rod is attached to the other end. An end plate having a through hole is attached to form a detour chamber between the outer tube and the cylinder, a piston is slidably disposed in the cylinder to form two pressure chambers on both sides, A rod is attached to the piston, a portion of which protrudes outward from the rod through hole, and the pressure chamber on the side through which the rod passes communicates with the detour chamber, and a valve is provided at the inner end of the through hole of the valve body. A pin valve that forms a seat and has a different outer diameter is inserted, and an operating ring whose inner end faces the step of the valve body is detachably attached to the outer end of the pin pulp, and the operating ring 1 is used to control the pin pulp. , the position is set so that the pressure chamber on the side where the rod does not pass and the detour chamber communicate with each other at the position where the inner end of the operating ring contacts the stepped portion of the valve body, and the operating ring is removed to open the pin valve. A length-adjustable gas spring characterized in that the two pressure chambers and the detour chamber communicate with the outside by further pushing the spring.