JPS6222027B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a sealing ring made of synthetic resin such as fluororesin used for resin seals, and in particular, The present invention relates to a method for manufacturing a sealing ring for a resin seal, which is inexpensive and has excellent sealing functionality when the outer diameter is large.

[Prior art and its problems]

In general, resin seals come in various configurations, but a lip member that comes into contact with a rotating shaft or reciprocating shaft to prevent internal fluids such as lubricating oil from leaking is made by laminating multiple annular thin-walled resin materials. Some use a sealed ring formed by

However, conventional sealing rings of this type have had the following problems in manufacturing.

That is, in the case of a single lip configuration, when manufacturing the lip, a method is adopted in which a lip with a J-shaped cross section is formed by drawing from an annular plate or cutting from an annular cylinder. For example, the former method As the inner diameter of the lip becomes larger, the inner and outer diameters of the annular plate also become larger.Therefore, the inner and outer diameters of the cylinder that is the material for the annular plate must also be increased, and the equipment for manufacturing the material becomes enormous. Naturally, this had the disadvantage of increasing production costs.

[Purpose of the invention]

The present invention has been made in view of these points, and provides a sealed ring that can easily manufacture a large sealed ring from a small material, requires a small manufacturing device, and has excellent sealing and functionality. It is an object of the present invention to provide a method for manufacturing a sealing ring for a resin seal, which can produce a sealing ring for a resin seal.

[Summary of the invention]

The method for manufacturing a sealing ring for a resin seal according to the present invention involves winding a thin band made of a synthetic resin material multiple times to form a layered cylinder such that both ends are located close to each other on the circumference, and then This layered cylindrical body is formed into a roughly J-shaped cross section with a flange part and a lip part connected, and then the tips of the flange part and lip part are cut according to the outer and inner diameter dimensions to form a predetermined sealing ring. It is characterized by

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 8.

FIGS. 1 to 5 show the present invention in the order of steps, and FIGS. 6 to 8 show a resin seal made using the sealing ring made by Bunsei.

First, the manufacturing process of this embodiment will be explained based on FIGS. 1 to 5.

First, as shown in FIG. 1, a thin band-shaped body 2 is manufactured by skiving a cylindrical material 1 of fluororesin made by pressurizing and heating fluororesin powder.

Next, this thin strip 2 is cut to a predetermined length, and as shown in FIG. (see FIGS. 4 and 5), and the layered cylindrical body 3 is configured so that both ends 21 and 22 are located close to each other on the circumference,
Make the radial thickness uniform over the entire circumference. In this way, when an annular plate is conventionally made from a cylindrical material and heated and drawn using a forming die, the outer diameter of the material needs to be approximately equal to the outer diameter dimension D of the layered cylindrical body 3. On the other hand, in this embodiment, the outer diameter of the material 1 can be a dimension d which is much smaller than the dimension D mentioned above. Next, as shown in FIG. 3, this layered cylindrical body 3 is heat-formed using molding molds 41 and 42 so that it has an approximately J-shape in which the flange part and the lip part are connected, and then As shown in FIG. 4, the flange portion and the tip end of the lip are cut as shown by arrows A and B and finished to produce the sealing ring body 5.

In this embodiment, the sealing ring 5 is manufactured by wrapping the thin strip 2 and then molding and finishing it, so the material 1 can be small and the manufacturing equipment can also be quite small. This makes it possible to reduce the manufacturing cost and is particularly effective for manufacturing a large-diameter sealing ring 5.

Note that the winding direction of the thin strip 2 does not matter for a rotating shaft that rotates forward and backward, or for a reciprocating shaft that only reciprocates.

Thereafter, the sealed ring body 5 manufactured in this way
As shown in FIGS. 6 and 7, they are housed in metal plate housings 6, 6' and assembled to produce a large fluorine resin oil seal.

In addition, from the relationship between the thickness of the thin fluorine resin, the number of layers, the size of the sealing ring 5, and the eccentricity, the coil spring 7 can be used as shown in FIG.
It is also possible to improve the eccentricity resistance by supplementing such factors, and the thickness of the thin wall and the number of layers can be selected completely arbitrarily depending on the usage conditions, making it highly adaptable and having a wide range of applications.

In addition, if the material of the sealing ring 5 is made of fluorocarbon resin as in this embodiment, the properties inherent to fluorocarbon resin such as chemical resistance, heat resistance, abrasion resistance, and friction resistance are fully functional as a seal. Furthermore, since the structure is layered, the sealing ring 5, which serves as the sealing lip, is made of fluorine resin but is highly flexible.
Sufficient followability to the shaft can be obtained as a sealing ring. Furthermore, from a functional point of view, it is possible to demonstrate the excellent performance unique to fluoroplastics that cannot be achieved with rubber lips. There is no damage to the mating shaft or wear of the lip itself, which is the case with a single lip, and since the lip is layered as shown in Figure 8, it will not damage a or b when the shaft runs out in the direction of arrow G. , c... correspond to the eccentric displacement e of the shaft S, and due to the small coefficient of friction between them, the deviations such as E and F occur without undue stress. Since the resistance is softened to follow, the sealed ring body 5 with a fluorine resin lip has extremely excellent followability.

Note that the winding direction is adjusted to the rotational direction of the shaft so that the inner peripheral end 22 of the lip does not turn over due to the rotational frictional force of the shaft. Depending on the pump action effect and rotation direction, the inner end of the lip 2
It is also possible to improve the sealing performance, such as the effectiveness of the pump action, by slanting the part 2.

〔Effect of the invention〕

Since the method for manufacturing a sealing ring for a resin seal of the present invention is constructed and operates in this manner,
A large sealing ring can be easily manufactured from a small material, the manufacturing equipment can be made small, and a sealing ring with excellent sealing and functionality can be manufactured.

[Brief explanation of the drawing]

Figures 1 to 5 show an example of the manufacturing method of a sealing ring for a resin seal according to the present invention in the order of steps. Figures 1 and 2 are perspective views of the material, and Figure 3 is a molding process. FIG. 4 is a longitudinal side view showing the finishing process, FIG. 5 is a plan view showing a part of the sealing ring, and FIGS. 6 and 7 are each manufactured according to the present invention. FIG. 8 is a partially vertical side view showing the state of the lip with respect to eccentric displacement of the shaft. DESCRIPTION OF SYMBOLS 1... Cylindrical material, 2... Band-shaped main body, 5... Sealing ring body, 6, 6'... Metal plate storage case, 7... Coil spring, 21, 22... End, 31... Layered cylindrical body, 4
1,42...molding die, S...shaft.

Claims (1)

[Scope of Claims] 1. A thin strip made of a synthetic resin material is wound multiple times to form a layered cylinder so that both ends are located close to each other on the circumference, and then this layered cylinder is connected to a flange portion and a lip. A resin seal characterized in that the resin seal is molded into a substantially J-shaped cross-sectional shape with continuous parts, and then the tips of the flange part and the lip part are cut according to the outer and inner diameter dimensions respectively to form a predetermined sealing ring. Method of manufacturing a sealed ring for. 2. The resin seal according to claim 1, wherein the thin strip is made by skiving a cylindrical resin made from resin powder by pressurization and heat molding. Method of manufacturing a sealed ring for. 3. The method for manufacturing a sealing ring for a resin seal according to claim 1 or 2, wherein the synthetic resin is made of fluororesin. 4. Sealing for a resin seal according to claim 1, characterized in that the winding direction of the thin strip is the same as the rotational direction of the shaft to be sealed from the outer peripheral end to the inner peripheral end thereof. Method for manufacturing rings. 5. The method for manufacturing a sealing ring for a resin seal according to claim 1, wherein the layered cylinder is heated and drawn to have a J-shaped cross section.