JPH07144524A - Hydropneumatic cylinder - Google Patents

Abstract

PURPOSE:To simplify gas filling work, dispense with seal face machining and the like and reduce the number of part items by elastically deforming the seal part of a diaphragm so as to lead gas into a gas chamber from a gas lead-in port, and pressing the seal part airtightly to the gas lead-in port by the resilience of the seal part so as to act as a check valve. CONSTITUTION:An upper seal part 56 is of such constitution as to be able to seal by preventing degasification from a high pressure chamber 5 to a low pressure chamber 13 by the outer peripheral part. This upper seal part 56 is provided with a lip 58 coming in contact with the inner peripheral wall of an outer cylinder 1, and when gas is led in from a gas lead-in port 61, the lip 58 is deformed in the inward bent state by the pressure of the gas to form a clearance, and the gas is led into the low pressure chamber 13 through a communicating hole 17. When the lead-in of gas is ended, oil in an oil reservoir 14 infiltrates into the inner peripheral wall of the lip 58 through the communicating hole 17, and the pressure of the low pressure chamber 13 acts, so that the lip 58 is airtightly pressed to the inner peripheral wall of the outer cylinder 1 and the gas lead-in port 61 so as to form a check valve 71 by the self-seal lip.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydropneumatic cylinder in which a gas inlet port for introducing gas into a gas chamber is sealed by using a seal portion of a diaphragm.

[0002]

2. Description of the Related Art In a conventional hydropneumatic cylinder, as shown in FIG. 8, a gas introduction port LO for a low pressure chamber is formed in an outer cylinder O at a position corresponding to a low pressure chamber L formed in an upper part of the outer cylinder O.
Forming a gas to introduce a gas to weld the plug LP, the upper end is locked to the wall portion forming the low pressure chamber, and the lower end is locked to the plug P inserted in the lower portion of the outer cylinder O. A high pressure chamber H is partitioned into a gas chamber K and a liquid chamber F by a stretchable rubber diaphragm D, and a gas introduction port HO for the high pressure chamber is formed in an outer cylinder O at a position corresponding to the gas chamber K. Ring member R and O-ring OR by introducing gas
The plug HP was attached through.

[0003]

In the conventional hydropneumatic cylinder, the low pressure chamber L and the gas chamber K are provided.
After introducing the gas through the gas introduction ports LO and HO to the gas introduction ports LO and HO, it is necessary to attach the plugs LP and HP to the gas introduction ports LO and HO. There was a problem that the number of parts increased because screwing and welding were required.

Therefore, the present inventors formed a gas introduction port in the outer cylinder at a position corresponding to the seal portion sealed on the inner peripheral surface of the outer cylinder of the diaphragm which is divided into the gas chamber and the liquid chamber. Introduced and reached the technical idea of the present invention of hermetically sealing the gas inlet using the seal portion,
As a result of further research and development, the present invention has been achieved which simplifies the gas filling operation and eliminates the need for sealing surface processing, screw processing, and welding processing to reduce the number of parts.

[0005]

A hydropneumatic cylinder of the present invention is an outer cylinder locked to one of a vehicle body and wheels, a cylinder arranged in the outer cylinder, and the other of the vehicle body and wheels. A piston rod inserted into the cylinder and locked in the cylinder, a working chamber formed in the cylinder filled with liquid, and a seal portion sealed at the inner peripheral surface of the outer cylinder, And a gas for introducing a gas to be enclosed in the gas chamber, which is formed at a position corresponding to a part of a seal portion of the diaphragm of the outer cylinder, and a diaphragm for partitioning a chamber and a liquid chamber communicating with the working chamber. A non-return structure in which the mouth and the seal portion of the diaphragm are hermetically pressed against the gas introduction port by utilizing the elastic force and the pressure of the gas introduced into the gas chamber. It is made of and.

[0006]

In the hydropneumatic cylinder of the present invention having the above structure, the seal portion of the diaphragm is elastically deformed from the gas introduction port to introduce the gas into the gas chamber, and the gas is stopped when the gas introduction is stopped. The pressure of the gas introduced into the chamber acts on the seal portion of the diaphragm, and the elastic force of the seal portion presses the gas inlet port in an airtight manner to function as a check valve.

[0007]

In the hydropneumatic cylinder of the present invention having the above-described operation, the elasticity of the sealing portion of the diaphragm is used to introduce and seal the gas, so that the gas filling operation is simplified and the sealing surface is This has the effect of reducing the number of parts by eliminating the need for machining, screwing, and welding.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) A hydropneumatic cylinder according to the first embodiment is an application of the present invention to a self-leveling absorber. As shown in FIGS. A piston having a cylinder 2 arranged in the outer cylinder 1 and a piston 31 which is locked to a wheel and is inserted in the cylinder 2 to form an orifice and in which an outlet valve 36 is arranged. A rod 3, a pump rod 4 having one end locked in the outer cylinder 1 and inserted in the piston rod 3, a working chamber 21 formed in the cylinder 2 and filled with oil, and the outer cylinder. A diaphragm 53 that includes seal portions 56 and 57 that are sealed on the upper and lower inner peripheral surfaces of the inside of 1, and divides the gas chamber 51 and the liquid chamber 52 that communicates with the working chamber 21;
Seal parts 5 above and below the diaphragm 53 of the outer cylinder 1.
The gas inlets 61 and 62, which are formed at positions corresponding to 6 and 57 and which introduce the gas to be enclosed in the gas chamber 51, and the upper and lower seal portions 56 and 57 of the diaphragm 53, are provided to the elastic force and the gas chamber 51. The check valves 71 and 72 are configured to be airtightly pressed against the gas introduction ports 61 and 62 by utilizing the pressure of the introduced gas.

As shown in FIG. 1, the outer cylinder 1 is composed of a hollow cylindrical body 10 with a bottom, and an engaging portion 11 to the vehicle body is provided at the upper end of the bottom.
Is formed, an insertion member 12 having a U-shaped vertical cross section is inserted in the bottom portion, and the low pressure chamber 13 is provided between the inner wall and the insertion member 12.
Is formed, and the oil reservoir 1 is formed below the low pressure chamber 13.
4 is formed, and the communication pipe 15 is provided in the oil reservoir 14.
Is provided.

As shown in FIG.
As shown in FIG. 3, the locking portion 16 formed of an annular groove into which the upper sealing portion 56 of the diaphragm 53 is inserted and locked is formed, and the upper gas formed on the outer cylinder 1 is formed. A communication hole 17 that connects the locking portion 16 and the low pressure chamber 13 is formed at a position corresponding to the introduction port 61, and the gas introduced into the outer cylinder from the gas introduction port 61 is introduced into the low pressure chamber 13. It has a structure that can be introduced through the communication hole 17.

The cylinder 2 is composed of a bottomed hollow cylindrical body 20 in which a working chamber 21 is formed. The cylinder 2 is inserted into the bottom of the insertion member 12 of the outer cylinder 1 with its bottom facing up, and the bottom center. Has a hole 22 for inserting the pump rod 4, an opening 23 for connecting the working chamber 21 and the liquid chamber 52 of the high-pressure chamber 5, and an outer peripheral wall and an inner peripheral wall of the interposing member 12. An oil passage 24 communicating with the liquid chamber 52 is formed between the above and the lower end, and an annular plug 25 is provided at the lower end between the lower end and the lower end of the outer cylinder 1.

On the outer periphery of the upper end of the annular plug 25,
As shown in FIG. 3 and FIG. 4, the lower gas formed on the outer cylinder 1 is formed with the locking portion 26 formed of an annular groove into which the lower sealing portion 57 of the diaphragm 53 is inserted and locked. The gas introduced into the outer cylinder through the introduction port 62 can be introduced into the gas chamber 51.

The piston rod 3 has the plug 25.
Is formed of a small-diameter hollow cylindrical body 30 having a pump chamber 32 formed therein and having a pump chamber 32 formed therein. A locking portion 34 for locking a wheel supporting member is formed at a lower end thereof, and a locking valve 34 serving as a damping valve is formed at an upper end thereof. A piston 31 having an orifice formed therein is fixed, a control sleeve 33 made of a thin, small-diameter hollow cylindrical body is inserted inside, and an outlet valve 36 urged upward in the figure by a spring at the lower end of the control sleeve 33. And an oil passage 35 that connects the pump chamber 31 and the working chamber 21 is formed between the outer peripheral wall of the control sleeve 33 and the inner peripheral wall of the piston rod.

The pump rod 4 is composed of a small-diameter hollow cylindrical body 40, the upper end of which is locked to the bottom of the outer cylinder 1 via a cushion 41, and a control for connecting the inner and outer peripheral walls to approximately the center in the longitudinal direction. A control opening 42 for determining a target vehicle height is formed, and a lower end is provided with an inlet valve 43 which is connected to the pump chamber 32 and is biased by a spring upward in the drawing. It communicates with the oil reservoir 14 via the communication pipe 15.

A pump chamber 32 is formed in the piston rod 3 in which the pump rod 4 is inserted. Inlet valve 43 formed in the pump rod 4
Communicates with the low pressure chamber 13 and the pump chamber 3
I have contacted 2. An outlet valve 36 formed in the piston rod 3 communicates with the pump chamber 32 and the working chamber 21 communicating with the high pressure chamber 5.

Therefore, when the absorber contracts, oil is supplied from the pump chamber 32 to the working chamber 21 through the outlet valve 36, and conversely when the absorber extends, oil is collected from the oil reservoir 14 through the inlet valve 43. Is configured to be supplied.

The diaphragm 53 is gas impermeable to partition a gas chamber 51 of a high pressure chamber 5 which constitutes a gas spring arranged in the outer cylinder 1 and a liquid chamber 52 which communicates with the working chamber 21. And a bent portion 54 that extends in the circumferential direction of the absorber and can change its shape, and is configured to allow the volume change of the gas chamber 51 and the liquid chamber 52. That is, the diaphragm 53 has a structure in which the surface layer is made of rubber, the resin film is disposed in the center, and the diaphragm 53 is sandwiched by the rubber of the surface layer.

The diaphragm 53 is hermetically sealed by the seal portions 56 and 57 at the lower end flange portion of the interposing member 12 disposed in the outer cylinder 1 and the engaging portions 16 and 26 at the upper end portion of the plug 25, respectively. Locked to the outer N ₂
It is divided into a gas chamber 51 filled with gas and a liquid chamber 52 communicating with the working chamber 21 via the oil passage 24, and a bent portion 54 is formed to extend in a pleated shape in the circumferential direction. It is configured in a tubular shape.

As shown in FIG. 3, the upper sealing portion 56 has a structure capable of preventing gas leakage from the high-pressure chamber 5 to the low-pressure chamber 13 by its outer peripheral portion and sealing the inner space of the outer cylinder 1. A lip 58 that abuts on the peripheral wall is provided, and when the gas is introduced from the gas introduction port 61, the lip 58 is bent and deformed inward by the pressure of the gas as shown in FIG. Through the low pressure chamber 1
3 is introduced, and when the introduction of the gas is finished, the oil in the oil reservoir 14 enters the inner wall of the lip 58 through the communication hole 17 by the pressure of the low pressure chamber 13 as shown in FIG. Since the pressure of the low pressure chamber 13 acts, the lip 58 is airtightly pressed by the inner peripheral wall of the outer cylinder 1 and the gas introduction port 61, and the check valve 71 is constituted by a self-sealing lip. .

The lower seal portion 57 is provided with a lip 59 which comes into contact with the inner peripheral wall of the outer cylinder 1, and the gas introduction port 6 is provided.
When the gas is introduced from 2, the lip 59 is bent and deformed inward by the pressure of the gas to form a gap to introduce the gas into the gas chamber 51, and when the introduction of the gas is completed, as shown in FIG. As shown in FIG. 5, since the pressure of the gas chamber 51 acts on the inner wall of the lip 58, the lip 59 causes the inner peripheral wall of the outer cylinder 1 and the gas introduction port 6 to move.
The check valve 72 is air-tightly pressed by 2 and constitutes the check valve 72 by a self-sealing lip.

In the hydropneumatic cylinder of the first embodiment having the above-mentioned structure, the gas introduction ports 61 and 6 are provided.
When gas is introduced from 2, the lips 58 and 59 are bent and deformed inward by the pressure of the gas as shown in FIGS. 2 and 4, and a gap is formed between the lips 58 and 59 and the inner peripheral wall of the outer cylinder 1. Gas is introduced into the low pressure chamber 13 through the communication hole 17 and gas is introduced into the gas chamber 51, and when the introduction of the gas is completed, the low pressure chamber 13 and the gas chamber 51 are introduced as shown in FIGS. 3 and 5. Pressure acts on the inner walls of the lips 58 and 59, and
3 and 4 are bent and deformed with respect to the free state shown by the broken lines in FIG. 3 and attached to the locking portions 16 and 26, so that the lips 58 and 59 cause the inner peripheral wall of the outer cylinder 1 to move. Also, the gas introduction ports 61 and 62 are airtightly pressed to prevent leakage of the gas and seal the gas.

Further, in the hydropneumatic cylinder of the first embodiment, when the absorber extends, the pump rod 4 relatively moves upward and the pressure in the pump chamber 32 decreases, so that the oil in the oil reservoir 14 is reduced. Enters the pump rod 4 through the communication pipe 15 and the cushion 41 and flows into the pump chamber 32 through the inlet valve 43. When the piston 31 is pushed down and the control opening 42 formed at the substantially center of the pump rod 4 is exposed to the working chamber 21, the oil in the working chamber 21 flows into the pump rod 4 through the control opening 42. Since the oil flows through the cushion 41 and the communication pipe 15 into the oil reservoir 14, the pressure in the working chamber 21 decreases and the height of the absorber is limited there.

In the case where the absorber contracts contrary to the above, when the pressure of the oil in the pump chamber 32 rises and exceeds a certain value, it overcomes the biasing force of the spring of the outlet valve 36 and flows out of the pump chamber 32. It flows into the working chamber 21 through the oil passage 35 formed between the sleeve 33 and the piston rod 3 to increase the pressure in the working chamber 21.

When the pressure in the working chamber 21 is high, the pressure of the oil in the liquid chamber 52 constituted by the oil chamber communicating with the working chamber 21 through the opening 23 and the oil passage 24 is also high. Therefore, the diaphragm 53 disposed between the gas chamber 51 and the gas chamber 51 is inverted outward in the radial direction, so that the volume of the high-pressure chamber 5 can be changed without expanding and contracting the diaphragm 53 itself.

The self-leveling absorber of the first embodiment having the above-described action introduces and seals gas by utilizing the elastic force of the lips 58 and 59 of the seal portions 56 and 57 of the diaphragm 53 and the gas pressure. ,
Compared with the conventional method, the gas filling work is simplified, and the sealing surface processing, screw processing, and welding processing are not required, and the number of parts is reduced.

In the hydropneumatic cylinder of the first embodiment, the surface layer portion of the diaphragm 53 arranged in the outer cylinder 1 is made of rubber, and the gas impermeable resin film is arranged in the middle. Therefore, the permeation of gas in the gas chamber 51 is prevented, and a large number of reversing portions formed in the circumferential direction of the absorber forming the bent portion 54 without expansion and contraction of the diaphragm 53 itself are shown in FIG. In addition, there is an effect that a large volume change is realized by the shape change accompanying the outward flip in the radial direction and the durability of the diaphragm 53 is improved.

The embodiments described above are merely examples for the purpose of explanation, and the present invention is not limited to them. Those skilled in the art can understand from the claims, the detailed description of the invention and the description of the drawings. Modifications and additions can be made without departing from the technical idea of the present invention that can be recognized.

In each of the above-described embodiments, the base of the lip is located below the gas inlet to reduce the rigidity of the lip and the gas pressure is effectively utilized for sealing. Is not limited thereto, and the base portion 59B of the lip 59M is aligned with the gas introduction port as shown in FIG. 6, or the base portion 58B of the lip 58M is positioned above the gas introduction port as shown in FIG. Accordingly, it is also possible to adopt a mode in which the rigidity of the lip is increased and the rigidity of the lip is effectively used to effectively seal in addition to the pressure of the gas.

In the above-mentioned embodiments, the example in which the diaphragm is made of the resin laminated film has been described, but it is of course possible to form the diaphragm only by rubber as shown in FIGS. 6 and 7.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is a partially enlarged cross-sectional view showing a gas introduction state of an upper seal portion of the first embodiment.

FIG. 3 is a partially enlarged cross-sectional view showing a gas sealed state of an upper seal portion of the first embodiment.

FIG. 4 is a partially enlarged cross-sectional view showing a gas introduction state of a lower seal portion of the first embodiment.

FIG. 5 is a partially enlarged cross-sectional view showing a gas seal state of a lower seal portion of the first embodiment.

FIG. 6 is a partially enlarged cross-sectional view showing another aspect of the lip.

FIG. 7 is a partially enlarged cross-sectional view showing still another aspect of the lip.

FIG. 8 is a vertical sectional view showing a conventional example.

[Explanation of symbols]

 1 Outer Cylinder 2 Cylinder 3 Piston Rod 4 Pump Rod 5 High Pressure Chamber 10, 20 Bottomed Hollow Cylindrical Body 11, 16, 26, 34 Locking Part 12 Insertion Member 13 Low Pressure Chamber 14 Oil Reservoir 15 Communication Pipe 17 Communication Hole 21 Operation Chamber 22 Hole 23 Opening 24, 35 Oil passage 25 Plug 31 Piston 32 Pump chamber 33 Control sleeve 36 Outlet valve 40 Hollow cylindrical body 41 Cushion 42 Control opening 43 Inlet valve 51 Gas chamber 52 Liquid chamber 53 Diaphragm 54 Bending portion 56, 57 Seal part 58, 59 Lip 61, 62 Gas inlet 71, 72 Check valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuyuki Sano 1 Toyota-cho, Toyota-shi, Aichi Toyota Motor Co., Ltd. (72) Inventor Yukihide Kimura 1-cho, Toyota-shi, Aichi Toyota-car Co., Ltd.

Claims (1)

[Claims] 1. An outer cylinder locked to one of a vehicle body or a wheel, a cylinder arranged in the outer cylinder, and an outer cylinder locked to the other of the vehicle body or the wheel and inserted in the cylinder. A piston chamber, a working chamber formed in the cylinder and filled with liquid, and a seal portion sealed at the inner peripheral surface of the outer cylinder, and a gas chamber and a liquid chamber communicating with the working chamber. And a gas inlet for introducing gas to be sealed in the gas chamber, which is formed at a position corresponding to the seal portion of the diaphragm of the outer cylinder, and a part of the seal portion of the diaphragm has elastic force and A hydropneumatic silicone, which comprises a check valve configured to be airtightly pressed against the gas introduction port by utilizing the pressure of the gas introduced into the gas chamber. Nanda.