JPH0637654U - Gas sealed structure - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a gas sealing structure capable of further improving reliability, excluding the drawbacks caused by the conventional gas sealing structure using a press-fitting type plug member. [Structure] The top portion (1A) of the gas filling body is formed of a plastic material in a downward slope toward the shoulder portion (1B), and the thickness of the top portion (1A) is changed from the shoulder portion (1B) to the gas filling hole (2). On the other hand, the diameter of the plug member 10 is made smaller than the diameter of the gas filling hole (2) and the diameter of the gas filling hole is reduced in the radial direction by plastic deformation of the gas filling rear top portion (1A). Then, the sealed state was obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a gas sealing structure, and more specifically, in a gas spring used for automobiles or industrial applications, it is possible to seal a gas after it has been sealed through a gas sealing hole formed at the top of the cylinder. Regarding stop structure.

[0002]

[Prior art]

 A conventional gas sealing structure of this type is disclosed in, for example, Japanese Patent Application Laid-Open No. 61-88898, and Japanese Patent Application Laid-Open No. 4-34232 shown in FIGS. 3 and 4. Things are known. In addition, in the plug member used in such a conventional gas sealing structure, it is generally necessary to fix a hinge member for supporting the end of the gas spring to the top of the cylinder after sealing, and the base of such a hinge member is required. When fused to the top after sealing, the plug member is melt-bonded together, including the plug member, to back up the sealed state of the plug member.

In the example disclosed in Japanese Patent Laid-Open No. 61-88898, a convex top portion is formed on a cap of a cylinder, a through hole is formed in the top portion, and oil or gas is sealed from the through hole. After that, the plug is press-fitted by another press-fitting means. After the press-fitting, the periphery of the through hole and the ring member (corresponding to the hinge member) are joined by resistance welding so that the above-mentioned sealed state and a sufficient joined state can be obtained.

On the other hand, in the example shown in FIGS. 3 and 4, the plug member 3 is press-fitted into a through hole (hereinafter referred to as a gas sealing hole) 2 formed in the top portion 1 A of a cylinder (tube cylinder) 1. In the case of this example, the plug member 3 is provided with a plurality of axial notches 3A in the peripheral portion thereof, and the head portion 3B is formed in a dish head shape. In this example, the gas can be filled in the cylinder 1 using the notch groove 3A with the plug member 3 partially attached to the gas filling hole 2, and after the filling, the plug member 3 is inserted into the gas filling hole 2 By further press-fitting the head portion 3B and the columnar gas sealing portion 3C into close contact with the corresponding wall surface of the gas sealing hole 2, the sealed state can be maintained. After that, the connecting piece 4A of the hinge member 4 is superposed on the head portion 3B of the plug member 3, and the welding electrode 5 is further abutted on the connecting piece 4A to energize the connecting piece 4A so that the mesh as shown in FIG. It is possible to melt and join the portion A with the eyes.

[0005]

[Problems to be solved by the device]

 However, in any of the conventional gas sealing structures as described above, when the gas sealing hole is press-fitted, the contact surfaces of the hole and the member slide against each other during press-fitting, resulting in rubbing scratches, resulting in gas leakage. May occur. In addition, the top of the cylinder itself does not have sufficient rigidity, and the ring member (or hinge member) and the periphery of the hole at the top of the cylinder are not necessarily welded uniformly. Therefore, when a load is repeatedly applied to the top portion via the above-mentioned support member, looseness may occur between the gas charging hole and the plug body, and gas or oil may leak from the cylinder.

The object of the present invention is to pay attention to such a conventional problem, and in order to solve the problem, a sufficient gas sealing state between the gas sealing hole and the gas sealing hole is ensured, and the gas sealing body support member and the seal member are protected from each other. An object of the present invention is to provide a gas sealing structure that can be melted together with the top of the binder to contribute to the sealing of the gas charging hole.

[0007]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention is to insert a plug member into a gas filling hole provided on the top of a gas filling body so that the gas can be filled, and after the gas filling, seal the gas filling hole by the plug member. In a gas-sealing structure that can be stopped, at least the top portion is formed of a plastic material in a downward slope toward a shoulder portion connected to the top portion, and the diameter of the plug member is smaller than the diameter of the gas sealing hole. After the gas has been filled, the top portion is plastically deformed to reduce the diameter of the gas filling hole in the radial direction, and the outer surface of the plug member is brought into close contact with the hole surface of the gas filling hole for sealing. It is characterized in that the state is obtained.

[0008]

[Action]

 According to the present invention, first, a plug member having a diameter smaller than the hole diameter is mounted in a gas-fillable state so that the gas can be filled in the gas-filled body, and then the plastic material is filled. It is possible to reduce the diameter of the gas filling hole in the radial direction by plastically deforming the top part of the plug, so that the plug member can be tightly sealed from the surroundings regardless of press fitting of the plug member. Therefore, there is no scratch on the sealing surface, and a highly reliable sealed state can be obtained.

[0009]

【Example】

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

FIG. 1 shows an example of the structure of a gas spring in which gas filling and assembly are completed using the plug member according to the gas sealing structure of the present invention. Here, 10 is a plug member inserted into a gas filling hole provided in the cylinder top 1A, and the gas sealing structure of the present invention shown in B is described in detail later. Reference numeral 11 is a piston member that slides in the cylinder 1, 12 is a piston ring, 13 is a piston rod, 14 is a rod guide that is provided at one end of the cylinder 1 and that keeps the piston rod 13 slidable, and 15 is a rod. An oil seal 17 which is arranged inside the guide 14 and prevents the oil 16 charged inside from leaking to the outside is a gas which is injected together with the oil 16 from the sealing hole 1A and functions as a spring. It should be noted that the piston member 11 is provided with a communication passage 19 for communicating between the upper chamber 18A and the lower chamber 18B in the cylinder 1 defined by the piston member 11, and a force is applied to the gas spring from the outside. When used, the compressed gas 17 moves between the upper chamber 18A and the lower chamber 18B via the communication passage 19, whereby the acting force can be buffered.

Next, the details of the gas sealing structure of the present invention and the procedure of the sealing operation will be described with reference to FIG.

FIG. 2A shows the state before gas filling.

In this example, a gas filling means (not shown) is attached to the cylinder top portion 1 A in this state, and gas is filled from the upper portion of the gas filling hole 2. That is, in the cylinder top portion 1A according to the present invention, the shoulder portion 1B connected to the top portion 1A of the cylinder 1 is formed thick, whereas the thickness is gradually reduced toward the gas charging hole 2. It is made of a plastic material. Further, as shown in this figure, while the shoulder portion 1B is rounded, the cylinder top portion 1A is formed in a shaded shape with the gas filling hole 2 as the top portion.

Further, the plug member 10 of this example is composed of a cylindrical plug body 10 A and a flat head 10 B, and the diameter of the plug body 10 A is smaller than the diameter of the gas charging hole 2. In the mounted state of the plug member before gas filling as shown in (A), a gap 20 as a gas passage is maintained between the surrounding portion of the plug body 10A and the hole surface of the gas filling hole 2. On the other hand, in the head portion 10B of the plug member 10, a portion for contacting the upper surface of the cylinder top portion 1A is provided with a gas filling passage groove (shown by a broken line) 30 for communicating the gap 20 with the outside. However, if the passage groove 30 is not provided, the head portion 10B of the plug member 10 may be floated above the top surface of the top portion 1A.

In the gas sealing structure thus configured, first, as shown in FIG. 2A, the plug body portion 10A of the plug member 10 is loosely fitted into the gas sealing hole 2 having a diameter larger than that of the gas sealing hole 2. Set to standby state. Next, a gas filling means (not shown) is set on the cylinder top 1A to keep the periphery of the plug member 10 in a sealed state, and then the cylinder 1 is filled with gas. When the gas filling is completed, pressure is applied from above the head portion 10B of the plug member 10, and the pressure is applied to the cylinder top portion 1A via the head portion 10B as shown in FIG. 2B. Plastically deform so as to narrow down.

The cylinder top portion 1A is deformed by utilizing plastic deformation. Therefore, at least the cylinder top portion 1A has plasticity, and the plug member is attached at the time of attaching the top portion of the hinge member 4 shown in (C). It should be formed of a material that can be welded together with 10. Thus, when the cylinder top portion 1A is plastically deformed as shown in FIG. 2B, the diameter of the gas charging hole 2 is reduced so that it is formed around the plug member 10. The gap 20 that has been eliminated disappears, and the plug member 10 comes into close contact with the hole surface of the gas sealing hole 2, so that the gas can be sealed.

When the gas sealed state is obtained in this manner, the connecting piece 4A of the hinge member 4 is pressure-bonded onto the plug member head portion 10B, and the connecting piece 4A and the plug are connected by welding means (not shown). The member head portion 10B and the cylinder top portion 1A can be melted and integrally joined as shown in FIG. 2 (C) surrounded by the one-dot chain line, whereby the cylinder 1 can be kept in a completely gas-filled state. .

In addition, in order to facilitate the plastic deformation, the embodiment in which the thickness of the top portion is gradually reduced from the shoulder portion to the periphery of the gas sealing hole has been described, but the present invention is not limited to this.

[0019]

[Effect of device]

 As described above, according to the present invention, at least the top portion is formed of a plastic material in a downward slope toward the shoulder portion connected to the top portion, and the diameter of the plug member is set to the diameter of the gas sealing hole. By making it smaller, the diameter of the gas filling hole is reduced in the radial direction by plastically deforming the top portion after the gas filling, and the hole surface of the gas filling hole is brought into close contact with the outer peripheral portion of the plug member. Since the sealed state is obtained by the above, the sealed state having higher reliability can be maintained as compared with the conventional gas sealed structure using the plug member by the press-fitting method.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration example of a gas spring to which the present invention is applied.

FIG. 2 is an explanatory view showing a configuration of a gas sealing structure according to the present invention and a sealing operation thereof in cross sections of a state before gas sealing (A), a gas sealing state (B) and a hinge welding state (C), respectively. It is a figure.

FIG. 3 is a cross-sectional view showing a configuration example of a conventional gas sealing structure before welding a hinge member.

FIG. 4 is a cross-sectional view showing a state after welding the hinge member of the conventional example shown in FIG.

[Explanation of symbols]

 1 Cylinder 1A Cylinder Top 1B Shoulder 2 Through Hole (Gas Filling Hole) 2A Hole Surface 4 Hinge Member 4A Connection Piece 10 Gas Sealing Plug Member 20 Gap 30 Passage Groove

Claims (1)

[Scope of utility model registration request] 1. A gas sealing structure in which a plug member is inserted into a gas sealing hole provided on the top of a gas sealing body so that the gas can be sealed, and after the gas sealing, the gas sealing hole can be sealed by the plug member. In the above, at least the top portion is formed of a plastic material in a downward slope toward a shoulder portion connected to the top portion, and the diameter of the plug member is made smaller than the diameter of the gas filling hole, so that the top portion after the gas filling is formed. By plastically deforming, the diameter of the gas sealing hole is reduced in the radial direction, and a sealing state is obtained by bringing the hole surface of the gas sealing hole into close contact with the outer peripheral portion of the plug member. Gas sealed structure.