JPH0259343B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a gas stick with improved lubrication performance and grease retention performance of sliding surfaces of the gas stick.

[Conventional technology]

Conventional Gaskotoku sliding surfaces are generally lapped by applying an abrasive to the sliding surface and finishing it by rubbing after cutting the sliding surface, and this sliding surface is coated with grease, etc. Ta. However, when an opening/closing durability test was conducted on the above-mentioned wrapping specification gas tank, the opening/closing operation torque increased after about 10,000 to 20,000 times, making the opening/closing operation impossible, resulting in poor airtightness in some cases. For this reason, there are some types of cocksockets that have been developed with the aim of improving durability, requiring no maintenance, and requiring no grease, and have a coating of solid lubricant formed on the sliding surface.

There are many known examples of such gas sticks, but for example, one disclosed in Japanese Utility Model Application Publication No. 170326/1987 is a solid lubricant in which an epoxy resin or a phenolic resin is added to molybdenum disulfide. For example, in Japanese Patent Publication No. 59-752, a coating material made by adding oxybenzoyl polyester to fluororesin (PTFE) as a solid lubricant is applied to Gaskotoku sliding surfaces. Coated on sliding surfaces. As mentioned above, by applying solid lubricants such as molybdenum disulfide and fluororesins to the sliding surfaces, the durability of gas kettles has improved significantly, but it is difficult to completely eliminate grease and oil, and it is difficult to achieve a completely grease-free and oil-free design. The sliding surfaces were coated with grease or oil.

[Problem that the invention seeks to solve]

As mentioned above, although the durability of the gas kettle has improved due to the solid lubricant coating on the sliding surface of the gas kettle, the opening/closing operation torque of the gas kettle was found to be limited to 100,000 to 200,000 times during the open/close durability test. It increased in size, making it impossible to open and close, resulting in poor airtightness. Possible reasons for this are as follows. In other words, in the conventional gas tank where the sliding surface of the closure is conical, the taper degree of the conical surface is 1/
The diameter is generally 6 to 1/8, and the contact surface of the closure body and the taper degree of the closure are processed to match. However, it is impossible to process the conical surface of the closure so that it coincides with the closure contact surface of the main body, and in reality, as shown in Figure 3a, the closure contact of the closure body 2 is made above the closure 1. The surface 3 is in contact with the sliding surface, or the sliding surface is not in uniform contact with the sliding surface as shown in FIG. In addition, due to the accuracy of processing machines and inspection machines, at present, the thickness of 2 to 3 μm above or below the sliding surface
A certain degree of error is allowed.

Next, when the product that failed in the durability test was disassembled and observed, it was found that the grease 4 on the sliding surface on the one-sided contact side had been depleted and a seizure phenomenon had occurred, as shown in FIG. This is because excess grease 4 is scraped off on the central circumferential surface of the sliding surface by the gas passage hole 5, and then grease 4 is applied and supplied to the sliding surface during opening/closing operations. is held, and the grease 4 is held on the sliding surface opposite to the one-sided contact by a slit of 2 to 3 μm formed on the sliding surface. On the other hand, since stress is concentrated on the sliding surface of the one-side contact portion, the grease 4 is discharged above the shutter and is exhausted. That is, the grease 4 cannot be held uniformly.

[Means for solving problems]

An object of the present invention is to improve the lubrication performance and grease retention performance of a sliding surface.

The technical means for achieving the above object is to slightly bulge the circumferential surface of the central part corresponding to the position of the gas passage hole of the closure, or the entire circumference of the inner surface of the Kotsuk body corresponding to the position of the gas passage hole of the closure. In addition to forming slits above and below the raised surface, a film of a coating material containing a solid lubricant is formed on the sliding surface of the closure or the main body of the lock.

[Effect]

The above technical means works as follows. That is, excess grease on the central conical surface of the sliding surface is scraped off into the gas passage hole, and grease is applied and supplied to the sliding surface during opening/closing operations, so that grease is always retained. Also, on the upper conical surface and lower conical surface of the sliding surface, 2
Grease is retained in this area due to ~5 μm slits. Furthermore, even if there is a shortage of grease for some reason, opening and closing operations will not become impossible due to the lubricating action of the solid lubricant.

〔Example〕

Examples of the present invention will be described below. 1 in Figure 1
In the embodiment, a raised surface 6 is formed on the conical surface corresponding to the gas passage hole 5 of the closure 1, the raised surface 6 is in contact with the closure contact surface 3 of the Kotsuk body 2, and thin strips are formed above and below the raised surface 6. Gaps 7 and 8 are formed.

Further, in the second embodiment shown in FIG. 2, the closure 1 has a tapered peripheral surface as in the conventional case, and the closure 1 faces the gas passage hole 5 formed in the closure 1 at the closure contact surface 3 of the closure body 2. A raised surface 6' is provided at the center of the main body 2, and narrow gaps 7 and 8 are formed above and below the raised surface 6'. Further, in addition to the first and second embodiments, both the center portions of the closing contact surface 3 of the closing member 1 and the main body 2 may be raised.

The widths of the slits 7 and 8 vary depending on the size of the gasket, but are preferably selected within the range of 2 to 5 μm.

Next, as for the method of forming a film of the solid lubricant 9, generally speaking, after performing machining to form the raised surfaces 6, 6' on the sliding surface as in the above-mentioned practice, the sliding surface is A solid lubricant film 9 may be formed, or after the sliding surface is machined into a normal conical surface, a solid lubricant film 9 of a considerable thickness is formed on the sliding surface, and then the film 9 is formed. The raised surfaces 6, 6' may be formed on the surface by cutting. Also solid lubricant film 9
may be formed on either the closure 1 or the lock body 2, or both, and this may be appropriately selected.

〔Effect of the invention〕

Grease is retained in the gas passage hole 5 at the center of the sliding surface and the slits 7 and 8 on the upper and lower surfaces of the sliding surface, and because the entire sliding surface has a uniform grease holding ability, the grease will not run out. Furthermore, since the solid lubricant 9 also has a lubricating ability, the opening/closing durability performance is improved and the airtightness performance is increased.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a first embodiment of the present invention, FIG. 2 is a sectional view of a second embodiment, and FIGS. 3 and 4 are sectional views of a conventional example. 1... Closer, 2... Kotoku body, 3... Closer contact surface, 4... Grease, 5... Gas passage hole, 6,
6'... Raised surface, 7, 8... Slit, 9... Solid lubricant film.

Claims (1)

[Claims] 1 In a case in which the sliding surface of a Kotuku body and a closure housed in the Kotoku body are formed into a conical shape, the central peripheral surface corresponding to the position of the gas passage hole of the closure body, or the closure of the Kotoku body The entire circumference of the inner surface corresponding to the gas passage hole is slightly raised, and slits are formed above and below the raised surface, and a coating material containing a solid lubricant is formed on the sliding surface of the closure or the main body. Gaskotoku is characterized by the fact that it did.