Polytetrafluoroethylene lip oil seal formed through compression molding at one time

Abstract

The invention discloses a polytetrafluoroethylene lip oil seal formed through compression molding at one time. The polytetrafluoroethylene lip oil seal consists of a static seal, a metal outer framework and a polytetrafluoroethylene inner ring seal lip, wherein the static seal comprises an excircle seal and an inner ring seal lip; the metal outer framework is embedded in the static seal in a compression molding mode; the polytetrafluoroethylene inner ring seal lip consists of an adhesive ring and a spiral seal ring; the adhesive ring and inner side faces of the static seal and the metal outer framework are adhered into a whole through compression molding; the inner side of a contact section of the spiral seal ring and a rotating shaft is provided with an inner spiral line seal lip; and the outer side face of the spiral seal ring is provided with an outer spiral line seal lip. The polytetrafluoroethylene lip oil seal formed through compression molding at one time has a few parts, is simple in structure and convenient to process, can be formed through compression molding at one time, and has stable sealing property, long service life and low cost; during seal fit of the spiral seal ring and the rotating shaft, the enveloping force is uniform, the enveloping force attenuation after a long time is small, repeated bending is facilitated and bending fracture is prevented.

Description

Technical field: [0001] The invention relates to a molded tetrafluoro lip oil seal. Background technique: [0002] PTFE lip oil seal is a new type of combined oil seal used in rotating occasions. Installed between the rotating shaft and the stationary housing, it can prevent the leakage of the lubricating medium in the housing when the shaft rotates. The structure of the existing combined PTFE lip oil seal in use is as follows: figure 1 As shown, it is composed of static seal 1, metal outer frame 2, PTFE inner seal ring 3, rubber gasket 4 and metal inner frame 5, and the static seal 1 and metal outer frame 2 are molded to form a skeleton outer seal ring 1. After the metal outer frame 2 is stamped and formed, glue is applied on its surface, and the static seal 1 is hot-molded on the metal outer frame 2 through a compression molding method. Wherein, the outer ring of the static seal 1 cooperates with the housing 7 to form a static seal pair, and the inner ring of the static...

AI Technical Summary

Problems solved by technology

[0007] ①There are many parts in the product portfolio, the product quality is difficult to control, and the stability is poor

[0008] ②The processing route is long, please refer to the attached image 3 , need to use special equipment, large investment

[0009] ③ Each piece of the helix on the sealing lip of the PTFE inner ring is turned separately, the depth and angle of the helix are difficult to control, and the product consistency is poor during mass production. At the same time, the processed helix is ​​prone to accidental damage in subsequent production

[0010] ④The sealing lip of the PTFE inner ring has a helix on only one side of the car, and the PTFE sheet is relatively stiff and prone to breakage during use

[0011] In order to solve the technical problem of unstable product quality of split-assembled PTFE lip oil seals, the applicant designed a one-time molding PTFE lip oil seal

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