JPH1026164A - Method for incorporating separative press damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply a free piston, piston rod and working oil with one time of a process. SOLUTION: After a free piston 2 is fitted in the upper end opening of a cylinder 1, a receptacle 4 opened upward is mounted to the outside of the upper end opening of the cylinder 1 in the liquid tight manner, and then the lower end of a piston rod 5 is pressed against the upper surface of the free piston 2 to push in the free piston 2 to a predetermined position by the piston rod 5. Then, working oil 10 put in the receptacle 4 enters an oil chamber above the free piston 2. Thereafter, a rod guide 7 and a seal 8 are inserted in the upper end opening of the cylinder 1 which is closed with an upper cap 9. By inserting and fixing the rod guide 7 and seal 8, the free piston 2 is separated from the lower end of the piston rod 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for assembling a separate pressure damper in which an oil chamber and a gas chamber are separated by a free piston or a bladder.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 53-72085 discloses a known separation pressure damper incorporating a free piston. As shown in FIG. 8, the separation and pressure damper has a free piston 101 provided in a cylinder 100, an oil chamber S1 above the free piston 101, and a gas chamber S2 between the free piston 101 and the bottom cap 102. A piston rod 104 with a piston 103 is inserted into the oil chamber S1, and a cylinder 100 is inserted into the oil chamber S1.
A rod guide 105 is provided inside the upper part of the cylinder 100, and the upper end of the cylinder 100 is closed with an upper cap 106.

In order to assemble the above separation pressure damper,
A stopper 107 protruding inward is formed on the outer peripheral portion of the cylinder 100 in advance, and the bottom cap 102 is still in this state.
The free piston 101 is inserted from below the cylinder 100 in a state where no gas is attached, the bottom cap 102 is attached, and nitrogen gas or the like is sealed in the gas chamber S2 via a valve provided in the bottom cap 102. Is prevented by the stopper 107 from moving upward due to the gas pressure. Thereafter, hydraulic oil is poured into the cylinder 100 and the piston 103 is moved from above the cylinder 100.
Is inserted, and finally the upper end of the cylinder 100 is closed with the upper cap 106.

As a method of assembling a separate pressure damper having a bladder instead of a free piston, Japanese Patent Publication No.
A method disclosed in Japanese Patent Application Publication No. -103052 is known. In this method, the separator and the bladder attached to the separator are pushed from above the cylinder to a predetermined position with a push rod, the outside of the cylinder is caulked, the separator is fixed, and after the working oil is filled in the cylinder, the piston is removed. This is a method of inserting the attached piston rod.

[0005]

Among the above-mentioned conventional assembling methods, the method disclosed in Japanese Utility Model Laid-Open No. 53-72085 requires a step of forming a stopper on the outer periphery of the cylinder, and the number of steps is reduced. In addition to increasing, the cylinder must be strong enough to form a stopper. Also, in the method disclosed in Japanese Utility Model Laid-Open No. 53-72085, the efficiency is poor because the free piston is inserted separately from below and the piston rod is inserted separately from above.

In the method disclosed in Japanese Patent Publication No. 6-103052, a step of caulking the outer periphery of the cylinder to fix the separator is required. Further, the insertion of the separator and the insertion of the piston rod are performed separately. Therefore, the work efficiency is poor as in the above case.

[0007]

In order to solve the above problems, the present invention comprises, as a first step, a free piston (or a separator provided with a bladder, hereinafter simply referred to as a free piston) at an upper end opening of a vertically arranged cylinder. )
As a second step, by inserting the piston rod into the cylinder while pressing the lower end of the piston rod against the upper surface of the free piston, the free piston is moved into the cylinder while the operating oil is filled in the chamber above the free piston in the cylinder. By pushing the rod guide to the predetermined position and inserting and fixing the rod guide attached to the upper part of the piston rod inside the upper end of the cylinder as the third step, only the volume of the rod guide and the parts attached thereto, or further added volume Only the free piston was separated from the lower end of the piston rod, and as a fourth step, gas was sealed in a gas chamber partitioned by the free piston via a bottom cap closing the lower end of the cylinder.

[0008] In the second step, in order to supply hydraulic oil into the cylinder while pushing the free piston to a predetermined position in the cylinder with the piston rod, for example, a container opened upward around the upper end opening of the cylinder is attached. In this state, the lower end of the piston rod may be pressed against the upper surface of the free piston and inserted in a state where the hydraulic oil is filled in the container.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the method of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a sectional view of a damper showing a state immediately before pushing a free piston into a cylinder with a piston rod, FIG. 2 is a sectional view of a damper showing a state where the free piston is pushed to a predetermined position, and FIG. FIG. 4 is a cross-sectional view of the damper showing a state where the rod guide is inserted and fixed therein, and FIG. 4 is a cross-sectional view of the damper showing a state where the gas chamber is filled with gas.

First, as shown in FIG. 1, a free piston 2 is fitted into an upper end opening of a cylinder 1 arranged vertically. In this embodiment, the bottom cap 3 is fixed to the lower end opening of the cylinder 1 in advance. However, the bottom cap 3 may be fixed in a step of filling gas into the gas chamber.

After the free piston 2 is fitted or before the free piston 2 is fitted, the container 4 whose upper part is opened outside the upper end opening of the cylinder 1 is mounted in a liquid-tight manner.

Thereafter, the lower end of the piston rod 5 is pressed against the upper surface of the free piston 2, and the free piston 2 is pushed by the piston rod 5 to a predetermined position as shown in FIG. It should be noted that a piston 6 is provided below the piston rod 5.
However, a rod guide 7 is provided above the piston rod 5.
A seal 8 and an upper cap 9 are attached.

As described above, when the free piston 2 is pushed by the piston rod 5, the hydraulic oil 10 contained in the container 4 enters into the oil chamber S1 above the free piston 2 with this. Note that a gas chamber S2 is formed below the free piston 2.

Thereafter, as shown in FIG.
Then, the seal 8 is inserted and fixed in the upper end opening of the cylinder 1, and the upper end opening of the cylinder 1 is closed by the upper cap 9. By inserting and fixing the rod guide 7 and the seal 8, the free piston 2 separates from the lower end of the piston rod 5 by these volume.

Next, nitrogen gas or the like is filled in the gas chamber S2 using the gas filling device shown in FIG. In the gas sealing device, a cylindrical inner case 12 is hermetically provided via a seal 13 in a cup-shaped outer case 11. Note that a gas passage 14 is formed between the inner case 12 and the inner case 12 in a state where the inner case 12 is incorporated in the outer case 11, and a pressurized gas is supplied to the gas passage 14 via a valve 15. The outer case 11 has a bolt 1
6 and 16 are erected, and a holding plate 17 is provided between the bolts 16 and 16.

In the above, the cylinder 1 is inserted into the inner case 12 from above via the seal 18, the lower end of the bottom cap 3 faces the gas passage 14, and the upper cap 9 is pressed by the pressing plate 17 in this state.

Next, the gas filling bolt 20 provided on the bottom cap 3 is loosened by the adjusting jig 19. In this state, as shown in FIG. 5, the notch 21 is formed on one side of the sealing bolt 20, so that a gas of a predetermined pressure is sealed in the gas chamber S2. Thereafter, the sealing bolt 20 is tightened with the adjusting jig 19 to complete the assembly of the separation pressure damper.

FIG. 6 is a view showing another embodiment in which the amount of the free piston 2 separated from the lower end of the piston rod 5 is adjusted by devising the shape of the container 4. That is,
In this embodiment, a skirt portion 41 having the same diameter as the cylinder 1 is provided at the lower portion of the container 4, and when the rod guide 7 and the seal 8 are inserted into the upper end opening of the cylinder 1, the hydraulic oil in the skirt portion 41 is also reduced to the cylinder. 1, the amount of the free piston 2 separated from the lower end of the piston rod 5 is increased by the volume. In the embodiment, the distance between the free piston 2 and the lower end of the piston rod 5 is adjusted by the skirt portion 41, but it is also possible to adjust the amount of oil to be introduced into the cylinder by other means. .

FIG. 7 is a view showing still another embodiment. In this embodiment, a bladder 42 is used instead of the free piston.
Is inserted into the cylinder 1 with the piston rod 5.

In the above embodiment, a container for containing hydraulic oil is attached to the upper end of the cylinder so that the free piston and the piston rod are inserted and the hydraulic oil is filled at the same time. It is also possible to insert a free piston or a separator while supplying hydraulic oil into the cylinder with a hose or the like instead of a container while immersing the cylinder.

[0021]

As described above, according to the method of assembling the separation pressurizing damper according to the present invention, first, a separator provided with a free piston or a bladder is fitted into the upper end opening of a vertically arranged cylinder, and then the piston is mounted. By inserting the piston rod into the cylinder while pressing the lower end of the rod against the upper surface of the free piston or separator,
Push the free piston or separator to the predetermined position in the cylinder while putting hydraulic oil into the free piston or the chamber above the separator in the cylinder, and then insert and fix the rod guide attached to the upper part of the piston rod inside the upper end of the cylinder. The free piston or separator is separated from the lower end of the piston rod by the volume of the rod guide and its associated parts, and the gas is separated into the gas chamber partitioned by the free piston or separator via a bottom cap that closes the lower end of the cylinder. , The insertion of the free piston or separator and the piston rod and the filling of the hydraulic oil can be performed in a single step. In addition, the step of forming the stopper of the free piston or the separator on the outer periphery of the cylinder can be omitted.

Further, since the position of the free piston is determined by the volume of the member attached to the rod guide such as the rod guide and the seal, the amount of separation between the piston and the free piston can be determined by adjusting the amount of oil.

[Brief description of the drawings]

FIG. 1 is a sectional view of a damper showing a state immediately before a free piston is pushed into a cylinder by a piston rod.

FIG. 2 is a sectional view of a damper showing a state in which a free piston is pushed into a cylinder to a predetermined position by a piston rod.

FIG. 3 is a sectional view of the damper showing a state where the rod guide is inserted and fixed in the cylinder.

FIG. 4 is a cross-sectional view of a damper showing a state where a gas is filled in a gas chamber.

FIG. 5 is an enlarged view of a gas filling bolt.

FIG. 6 is a view showing another embodiment in which the amount of separation between the free piston and the piston rod can be adjusted.

FIG. 7 is a diagram showing an example of assembling a separator having a bladder instead of a free piston.

FIG. 8 is a sectional view of a general separation pressure damper.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cylinder, 2 ... Free piston, 3 ... Bottom cap, 4 ... Container, 5 ... Piston rod, 6 ... Piston, 7
... rod guide, 8 ... seal, 9 ... upper cap,
10: hydraulic oil, S1: oil chamber, S2: gas chamber.

Claims (3)

[Claims] 1. A method of assembling a separation pressure damper, comprising the following steps. First step A step of fitting a free piston to the upper end opening of a vertically arranged cylinder. Second step By inserting the piston rod into the cylinder while pressing the lower end of the piston rod against the upper surface of the free piston, the free piston is moved to a predetermined position in the cylinder while hydraulic oil is supplied into the chamber above the free piston in the cylinder. The process of pushing up. Third step By inserting and fixing the rod guide attached to the upper part of the piston rod inside the upper end of the cylinder, the free piston is moved only by the volume of the rod guide and the parts attached thereto, or further by the added volume of the piston rod. The process of separating from the lower end. Fourth step: a step of filling a gas into a gas chamber partitioned by a free piston via a bottom cap closing a lower end of a cylinder. 2. The method of assembling a separation / pressure damper according to claim 1, wherein in the second step, an upwardly open container is attached to a periphery of an upper end opening of a cylinder, and hydraulic oil is filled in the container. In this state, the free piston is pushed into a predetermined position in the cylinder by inserting the piston rod into the cylinder while pressing the lower end of the piston rod against the upper surface of the free piston. Assembly method. 3. A method for assembling a separation pressurizing damper, comprising inserting a separator provided with a bladder into a cylinder with a piston rod instead of the free piston according to claim 1 or 2.