JPS5853481Y2 - Gas-filled shock absorber - Google Patents

Description

[Detailed description of the invention] This invention is a gas-filled shock absorber.
This improves the durability of the gasket and reduces its friction.

2. Description of the Related Art As a gas-filled shock absorber, one shown in FIG. 3 is conventionally known.

In this conventional shock absorber, a bearing 2 that supports a piston rod 1 is firmly attached to the upper end of an inner duplex 3, and a packing case 4 is attached to this bearing 2.
They are attached to the outer shell 5 in a fixed state.

The packing case 4 houses the packing 7 inside, and the packing holding part 6 with which the upper end of the packing 7 comes into contact
is shaped like a mountain.

And the above-mentioned packing 7 installed inside this packing case 4
is pressed against the packing holding part 6 by the spring 8 and the holding plate 9.

) Further, gas is sealed in a chamber 10 formed between the inner tube 3 and the outer shell 5. This gas flows into the chamber 12 through the hole 11 formed in the bearing 2, and presses the gasket together with the spring 8. .

However, when the above-mentioned conventional shock absorber is operated under high temperature and high pressure and the packing 7 is compressed,
There were the following inconveniences.

In other words, when the packing 7 is compressed, the packing case 4
Since the presser part 6 is chevron-shaped, there is a drawback that the gasket rises along that surface and protrudes from the opening 13.

In addition, as mentioned above, in the process of rising along the holding part 6, the packing T is strongly pressed against the piston rod 1, resulting in severe wear.9 This invention improves the shape of the packing case and packing. The purpose of this article is to provide a gas-filled shock absorber with improved packing durability. , the embodiment shown in FIG. 2 will be explained. As mentioned above, this invention improves the shape of the packing case and the packing, and the other configuration is the same as the conventional one, so the common elements will be explained in the third section. The same reference numerals as those in the figure are given, and the details are omitted.

The packing case 16 in this embodiment has a large diameter part 17 formed on the lower side thereof, and the upper end of this human diameter part 17 is bent in the direction of the piston rod 1, and the inner end of the bent part 18 is made to stand up. The upright portion is a packing housing cylinder portion 19 having a smaller diameter than the large diameter portion 17.

The packing case 16 configured in this way has the large diameter portion 17
is attached to the outer periphery of the bearing 2, and the large diameter portion 11 is attached to the outer shell 5 while maintaining this attached state.

Then, the upper end of the packing storage cylindrical portion 19 is further bent inward to form the uppermost packing holding step surface 20, and a second packing holding step surface 21 is placed inside the first packing holding step surface 20. is formed.

The second packing presser stepped surface 21 is made horizontal to a plane orthogonal to the piston rod 1 and is held at a lower position than the first packing presser step surface 20, and the second packing presser step surface is moved from the first packing presser step surface to the second packing presser step surface. A step is provided between the presser foot and the step surface.

Furthermore, the first. 'A raised portion 22 having an inclination angle that gradually rises outward is formed at the boundary of the second packing presser step surface.

Therefore, this packing case 16 is equivalent to having a dish-shaped recess formed on its upper end surface, and in the center of the recess,
In other words, the piston rod 1 is passed through the rod hole 23 formed in the middle of the second packing presser step surface 21.

1 1.

On the other hand, the packing 24 creates a step between the first pressing surface 25 and the second pressing surface 26, which form first and second pressing surfaces 25 and 26 corresponding to each stepped surface of the packing case 16. I'm old.

Further, a raised portion 27 having an inclination angle corresponding to the raised portion 22 of the packing case 16 is formed at the boundary between these two pressing surfaces.

Then, with respect to the step difference on both step surfaces of the packing case,
The step on the pressing surface of the packing is increased.

The gasket 24 is then attached to the gasket case 16, but in this state, the gas and the load of the spring 8 are
It acts on the seal 24.

The above-mentioned load is received by both pressing surfaces 25° and 26 of the packing, but as mentioned above, due to the difference in level between both stepped surfaces 20 and 21,
Since the step between both pressing surfaces 25 and 26 is larger,
The first pressing surface 25 comes into stronger pressure contact with the first packing pressing step surface 20.

Therefore, the second presser surface 26 and the second seal presser step surface 2
1 becomes weaker accordingly, the second pressing surface does not protrude from the rod hole 23.

Further, as described above, since the raised portion 22 having an inclined angle is formed at the boundary between the packing presser step surfaces 20 and 21, when the packing is compressed, the material movement can be completely prevented by the raised portion.

Therefore, the lip portion 14 is not pressed against the piston rod 1 more strongly than necessary, and its wear can be suppressed as much as possible.

As is clear from the above explanation, this invention has the following structure.

That is, a packing-sniping packing storage cylinder part that attaches to the bearing is formed, and a first packing presser stepped surface bent in the direction of the piston rod is formed at the upper end of this packing storage cylinder part, and this first packing presser step surface is formed at the upper end of this packing storage cylinder part. A second packing holder is located inside the color surface, in other words, closer to the piston rod than the first packing holder, is horizontal to a plane orthogonal to the axis of the rod, and is one step lower than the first packing holder. On the other hand, the gasket to be attached to the gasket storage cylinder section is formed with first and second presser surfaces corresponding to the first and second presser step surfaces, and the first and second presser step surfaces correspond to the first and second presser step surfaces. The step difference between the first and second presser surfaces is made larger than the step difference between the first and second packing presser surfaces.

Therefore, even if the packing is strongly compressed, the second
The presser surface will no longer protrude from the packing case.

When the gasket is strongly compressed, the first
Just by pressing the presser surface against the first packing presser step surface,
This is because the force with which the second pressing surface comes into pressure contact with the second packing pressing step surface does not become strong.

The first part is in the packing case. Since the above-mentioned raised portion is formed at the boundary of the second packing presser step surface, even if the packing is strongly compressed as described above, the lip portion will not come into pressure contact with the piston rod more strongly than necessary.

Therefore, the lip portion will not be severely worn.

[Brief explanation of drawings]

Drawing 1st. Figure 2 shows one embodiment of this invention.
FIG. 1 is a sectional view of the main part, FIG. 2 is a sectional view of the main part with the packing case and packing separated, and FIG. 3 is a sectional view of the main part of the conventional device. 1... Piston rod, 16... Packing case, 17... Large diameter section, 19...
・Packing storage cylinder part 20...First packing press step surface, 21...Second packing press step surface, 22.
... Standing part, 24 ... Patsukin, 25.
...first presser surface, 26...second presser surface,
27... Standing part.

Claims (1)

[Scope of utility model registration request] A packing housing cylindrical portion is formed in the five-piece skin case that attaches to the bearing, and a first packing holding step surface bent in the direction of the piston rod is formed at the upper end of this packing storing cylinder, and this first packing holding step Inside the face,
While the second and three seal presser steps are formed one step lower than the first seal presser step surface, the packing to be attached to the seal storage cylinder has a second presser step surface that corresponds to the first and second presser step surfaces. 1 and a second presser surface are formed, and the first and second presser surfaces are formed.
A gas-filled shock absorber in which the step difference between the first and second presser surfaces is larger than the step between the seal presser step surface and the second seal presser step surface.