JPS6283522A - Damping force variable type fluid pressure shock absorber - Google Patents

Abstract

PURPOSE:To make it possible to charge a gas additionally to lower cost by so retaining a control rod as to be capable of being pushed down inside a piston rod by a spring and simultaneously by forming a notch which functions as a gas passage between a control rod and a seal at the time of pushing down. CONSTITUTION:A control rod 13 is inserted into a hollow piston rod 12 and the control rod 13 is so retained as to be capable of being pushed down by providing a spring 16 at its lower end. On the other hand, a seal 14 between rods is formed at the upper end of the hollow section 12a of the hollow piston rod 12 and a notch 17 is formed at the upper end of the control rod 13. hereupon when the notch 17 pushed down the control rod 13 up to the position of a seal 15 between rods by connecting a gas charging device with the tip of the hollow piston rod 12, a gas can be charged into inside of a cylinder through a gas delta. Consequently additional charging of a gas, simplification of a work and cost down can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application The present invention has a control rod 24 for adjusting the damping force that is fitted into a hollow piston wood, and the control rod 24 is rotated or moved up and down. Relating to a pressure relief device of the type with which the damping force can be adjusted by opening/closing the hydraulic fluid bypass flow path or increasing/decreasing the road surface damping force using the adjuster at the tip. It is.

BACKGROUND OF THE INVENTION In this 4th 0fc Airikicho I-type hydraulic pressure relief 6, a so-called pressurized gas is sealed in the upper part of the reservoir chamber, etc. This is because # is a method that reduces the stability of the weakening force.

In the conventional T-type hydraulic instrument with damping force, a gas injection hole 2 is formed in the bottom plate l as shown in FIG. Pressure gas 'It liquid pressure-
It is configured to be injected into the bomber (?!l Special Publication No. 63 of 1973).

Problems that the invention aims to solve By the way, in the conventional
As mentioned above, the gas injection hole 2 is formed in the bottom plate 1, and the pressurized gas is injected into the hydraulic pressure buffer from the gas injection hole 2. The point t6 +11 gas injection work is [fi@].

The reason is that the gas injection hole t'2, which is provided in the bottom plate 1, cannot be filled with hydraulic fluid when the gas injection hole t'2 is open 7. For this purpose, the gas injection holes 2t must be temporarily aligned. To increase the pressure of this hydraulic fluid, temporarily scratch the gas injection hole 2 with an easily removable rubber band or the like, and now that the hydraulic fluid has been filled, the hydraulic pressure f device? @a-sase,
Remove the temporary stopper and pressurize the knife mouth pressure gas from the gas injection hole 2. After injecting the knife mouth pressure gas, press the gas injection hole 2t plug JJ.
This is because it must be firmly sealed with the P seal washer 4.

(2) Since the plug 3'P seal washer 4 is used more conveniently, the number of its parts increases and the cost of the hydraulic ridge extension device increases.

The present invention attempts to solve all of the above-mentioned conventional problems by effectively utilizing the space between the hollow piston rod and the control rod inserted into the hollow part as a gas injection passage. It is something.

Problem 't - How to solve the problem - control rod versus hollow piston rod? The upper end of the control rod is held by a spring so as to be able to be pushed down. Next, form a notch r to create a gas flow path between the seal and the seal.

Operation When the control rod is pushed down against the spring force of the spring, a notch formed in the upper part of the control rod is inserted between the hollow piston rod and the control rod by the C1 seal at the position of the inter-rod seal. This temporarily releases the seal between the hollow piston rod and the control a7)'? ! : Between ClJV
Pressure gas using sword between IA? It becomes possible to press fit. 17 After injecting pressure gas, return the control rod to its original position, and the gap between the hollow piston rod and control rod is sealed again with a rod dark seal. Prevent leakage, fr N *.

1 to 6 show examples of the VFC-CTf type hydraulic shock absorber of the present invention. Refer to and explain.

11 is a ctJ damping force variable pressure reliever of the present invention, 12 is a hollow piston rod, and 131'! Hollow piston rod 12
Control rod inserted into the hollow part x2aK, 14
is an inter-rod seal attached to the upper end side of the hollow part 12a of the hollow piston rod 12 and seals the gap δ with the control rod 13. 15i Rod viewing seal 14
Mounted above the control rod guide, 1
6 is a spring attached to the lower end side of the hollow portion 12a of the hollow piston rod 12, and holds the control rod 13 in a downward rotational position with respect to the hollow piston rod 12; and 17 is the control rod. There are nine notches f'L formed in the upper layer of 13. The σ notch 17 is connected to an actuator (not shown)! lj continuation part, upper end of control rod 13! −[' is the predetermined length/, (11> the same axial length l of the rod dark seal 14, + the same length of the control rod guide 15/,) to form the LO shape 1 When the control rod 13'7 is pushed down against the spring force of the spring 16, it comes to the position of the inter-rod seal 14 and the control rod guide 15, and there is a gap between the seal 14 and the rod guide 15. It has two sections to form a gas flow path 18. Note that the lower end of the control rod 13 has an adjuster (
A damping force adjuster 19 is provided, and an adjuster 191CI is provided at δ and an orifice 20a of various sizes is provided.

20n... are installed in the hollow piston rod 12 to meet the nine through holes 21a, 21o... at the V position to release the entire bypass passage for the liquid, and the damping force is variably adjusted. It's becoming a sea urchin. The piston 22 is attached to the lower end of the hollow piston rod 12, and the piston 23 is slidably excited #F! The VC is a cylinder in which the inside of the piston 2 is spaced between the upper WJL chamber 24 and the lower liquid chamber 25, and the front piston 22 has a middle 9 piston rod 1.
A damping force generating means 26 is provided which generates a damping force by the movement of the second cylinder.

Reference numeral 27 denotes a bottom body attached to the lower end of the cylinder 23, and the bottom body 27 has a damping force generating means 28 on the compression side that generates a damping force in the compression stroke of the hollow piston rod 12C/J. ing. 29 The outer surface that houses the entire cylinder 23, 30 is attached to the lower end of the outer surface 29.
The bottom plate 31 is a reservoir chamber formed between the outer circumferential surface of the cylinder 23 and the outer circumferential surface 190, and is press-fitted into the hydraulic shock absorber 11. It becomes O that accumulates at the top of the . Installed on the upper part of A2 cylinder F23υ: n7'j piston rod guide.

This is a seal S material that is attached to the upper end of the outer WJ 29 and seals between it and the hollow piston rod 12.

I will briefly explain the above-mentioned V) threat of filling pressurized gas into the variable pressure relief vessel. After assembling the damping force type F-type pressure equalizer and filling the hydraulic fluid, insert the tip of the nozzle 34 of the gas filling device at the tip of the hollow piston rod 12 as shown in FIG. Let the storm rise,
Press the nozzle 341F3 @ 352 down, press down the control rod 13 against the spring force of the spring 16, and create the circular inter-rod seal 14 from the notch 5t7t to the hollow part 12a of the hollow piston rod 12.The control rod guide 15 When lowered to the lower position 1, a gas flow path 18 is formed between the control rod 13, the inter-rod seal 14, and the control rod guide 15. Therefore, under this condition, the gas G flows from the nozzle 34 into the gas flow path 1.
8. Gap between hollow piston rod 12 and control rod 13 δ? injected into the cylinder 23 through
That will happen.

Then, when a predetermined amount of pressurized gas is injected and the press rod 3s'2 is moved upward, the control rod 13 returns to its original position by the spring force of the spring 16 and becomes hollow. Piston rod 12 and control rod 1
The 4th room δ of the cabinet with 3 is sealed with seal 14 between Rotudo n
Injecting 1 t gas will definitely prevent the possibility of gas leakage.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, a control rod is held by a spring so as to be able to be pushed down with respect to a hollow piston rod, and the upper end of the control rod is provided with a spring.
? When pressing down, the position of the seal between the rods in the hollow part of the hollow piston rod comes, and the gas flow path between the seal and the seal? Since the notch is widened in shape, it has the following effects.

When you push down the control rod against the spring force, the inter-rod seal between the intermediate piston rod and the control rod is temporarily released, so the ? Using this, pressure gas can be injected from the upper end of the hollow piston rod υ, and 1
When installing the Nine Rod Seki Seal, pressurized gas can be injected while it is made of leather.

This is particularly convenient for additional injection of 77III pressure gas.

(2) Since pressurized gas can be injected from the upper end of the hollow piston rod, when the conventional bottom plate has a gas injection hole, after filling the hydraulic fluid, the hydraulic The troublesome process of completely injecting the gas is eliminated, and the gas injection process can be simplified.

(Since the 31 in 9 piston can be injected from the gap between the piston wood and the control rod tonneau, no plug or seal washer is required if the conventional bottom plate does not have all the gas injection holes. No longer needed,
The cost of hydraulic pressure ##6 can be lowered by reducing the number of parts by that much.

[Brief explanation of drawings]

Fig. 1 is a tilted view of the uninvented variable hydraulic pressure device. Fig. 2 is an enlarged sectional view of the seal between the rods, and Fig. 3 is the
The plan view of the figure %M4 is an enlarged cross-sectional view of the spring mounting part, Figure 5 is a cross-sectional view showing the pressurized gas filling process, and Figure 7 is a conventional e, damping force OTI' type liquid. FIG. 3 is a sectional view of the bottom of the pressure chamber. DESCRIPTION OF SYMBOLS 11... Variable damping force type hydraulic relaxer, 12... Hollow piston rod, 12a... Hollow part, 13... Control rod, 14... Seal between rods, 16...
Spring, 17... Notch, 18... Gas flow path. External name: Figure 2, Figure 4, Figure 5, Figure 6, Figure 7.

Claims (1)

[Claims] (1) Driving a control rod that extends into the hollow portion through an inter-rod seal that airtightly seals one end of the hollow portion of the hollow piston rod, and opening and closing the hydraulic fluid bypass passage with the adjuster at its tip. Alternatively, in a variable damping force hydraulic shock absorber in which the damping force is varied by increasing or decreasing the flow path area, a control rod is held by a spring so as to be able to be pushed down with respect to the hollow piston rod, and A damping force characterized in that a notch is formed at the upper end of the control rod so that when the control rod is pushed down, it comes to the position of the inter-rod seal in the hollow part and creates a gas flow path between the control rod and the seal. Variable hydraulic shock absorber.