JP2006077902A - Oil seal made of fluorine contained resin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem wherein oil enters through gaps between metal reinforcement rings and between the reinforcement ring and an outer peripheral horizontal end part of a seal lip to cause oil leakage. <P>SOLUTION: This oil seal includes: an oil seal body formed by fluorine contained resin as a whole, and having a husk part of a garter spring formed of an annular plate and a lip body part constituting a seal lip, which are connected to each other at the inner peripheral ends, in which a seal lip part raised obliquely inward is formed on the inner peripheral side and a horizontal flange-like fixed seal part is formed on the outer peripheral side; a garter spring mounted near the inner peripheral end between the lip body part and the husk part; an outer L-shaped metal reinforcement ring; an inner L-shaped metal reinforcement ring closely fitted to the inner peripheral side; and an elastic material having soft elasticity, which is loaded between the fixed sealing parts of the oil seal body and pressurized and held together with the fixed sealing part by the respective flange parts of the inner and outer L-shaped metal reinforcement rings. The oil seal is sealingly press-bonded to the respective flange parts of the inner and outer L-shaped metal reinforcement rings without clearance by the elastic pressure of the elastic material to completely inhibit intrusion of oil at this part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an oil seal made of fluororesin, and more particularly to an oil seal in which a slit is cut from an outer periphery to an inner periphery of an annular fluororesin plate and a garter spring is loaded into the slit to form a seal lip.

  Conventionally, an annular fluororesin plate is cut from the outer periphery to the inner periphery by slightly cutting the inner peripheral end portion into an annular slit, and a garter spring is loaded into the slit to form a seal lip portion. There is known an oil seal in which a fixed seal portion having a horizontal flange shape at the outer peripheral end portion of the seal body is press-clamped by flange portions of inner and outer L-shaped metal reinforcing rings.

  In this oil seal, the entire seal lip is molded with a fluorine resin excellent in heat resistance, wear resistance, chemical resistance, corrosion resistance, etc., and the entire garter spring loaded in the slit is hermetically covered with a fluorine resin plate. Therefore, it is superior in performance to a rubber oil seal with a garter spring mounted on the outer periphery of a conventional seal lip in that it prevents corrosion and dust from being adhering to chemicals and moisture. Compared to oil seals that use fluororubber that has wear resistance, chemical resistance, and corrosion resistance, the material cost can be reduced, and the manufacturing cost can be reduced because it does not require a vulcanization molding process. , Has the disadvantage of oil leakage.

JP-A-53-109062

  In the conventional fluororesin seal lip, the fixed seal portion at the outer peripheral horizontal end is pressed and clamped by the flange portion of the inner and outer L-shaped metal reinforcement rings, but the inner metal reinforcement ring is connected to the outer metal reinforcement ring. It is almost impossible in manufacturing (dimensional accuracy and distortion problems during molding) and machining (problem of processing distortion during insertion) to fit in the inner periphery without any fine gaps. A gap is also formed between the inner and outer metal reinforcing rings and the fixed seal portion of the seal lip sandwiched between the inner and outer metal reinforcing rings, and as a result, between the peripheral wall portions of the inner and outer metal reinforcing rings and the flange portion of the inner metal reinforcing ring and the oil seal Oil enters the gap between the fixed seal parts of the main body and leaks outside through the gap between the flange part of the outer metal reinforcement ring and the fixed seal part of the oil seal main body. Cause There often was seen.

  The present invention is sandwiched between the flange portions of the inner and outer metal reinforcing rings in order to block the oil entering from the gap between the upright portions of the metal reinforcing ring and the flange portion of the metal reinforcing ring and the fixed seal portion of the oil seal body. An annular elastic material is loaded between the fixed seal parts of the seal lip, and the elastic seal of this elastic material is used to seal and seal the fixed seal part of the seal lip to the flange part of the inner and outer metal reinforcement rings. Main features.

  In the present invention, an annular elastic material is loaded between the fixed seal portions of the oil seal body sandwiched between the flange portions of the inner and outer metal reinforcing rings, and the fixed seal portion is reinforced by the elastic force of the elastic material. By sealing and sealing the flange portion of the ring, oil leakage can be reliably prevented with a simple process using an extremely inexpensive member.

  In addition, since the inside of the fixed seal portion is hermetically sealed by the elastic material, intrusion of oil or the like from this portion is prevented, and corrosion of the garter spring can be prevented.

  The purpose is to prevent oil from entering between the vertical part of the inner and outer metal reinforcement rings and the gap between the flange part of the inner metal reinforcement ring and the fixed seal part of the oil seal body, and causing oil leakage between the parts to be sealed. Realized by simple processing with extremely inexpensive materials.

  The oil seal main body 1 is entirely formed of a fluororesin, and is mainly formed by drawing from a covering portion 3 that is a portion covering the garter spring 2 and a lip main body portion 4 constituting a seal lip.

  The manufacturing method of the oil seal body 1 is similar to the manufacturing method described in Japanese Patent Laid-Open No. 53-109062. First, the fluororesin material formed into a cylindrical shape is cut into appropriate thicknesses, and the obtained circle is obtained. An annular slit S is cut into the annular seal substrate K from the outer periphery to the inner periphery, leaving the inner peripheral end portion slightly cut, and the thin envelopes connected to each other at the inner peripheral end. The portion 3 and a thick lip body portion 4 suitable as a seal lip are formed (FIG. 2).

  Next, the garter spring 2 is loaded into the slit S, and is drawn so as to wrap most of the outer periphery of the garter spring 2 in the vicinity of the inner peripheral end of the lip main body 4 as shown in FIG. The inner peripheral side of the covering portion 3 and the lip main body portion 4 rises obliquely inward at an appropriate angle as a portion constituting the seal lip 4a, and the outer peripheral side is horizontal as the fixed seal portions 3a and 4b of the oil seal main body 1. Molded into a flange shape.

  Between the fixed seal portions 3a and 4b of the oil seal main body 1, an elastic material 5 made of soft elastic rubber, soft synthetic resin or the like is loaded, and when the oil seal is assembled, the outer L-shaped metal reinforcing ring 6 and By fixing the elastic material 5 with the flange portions 6 'and 7' of the inner L-shaped metal reinforcing ring 7 closely fitted on the inner peripheral side thereof, the fixed seal portion of the oil seal main body 1 is pressed. 3a and 4b are strongly pressure-bonded to the flange portions 6 'and 7' of the inner and outer metal reinforcing rings 6 and 7.

  As a result, the fixed seal portions 3a and 4b of the oil seal body 1 are pressure-bonded to the flange portions 6 ′ and 7 ′ of the L-shaped metal reinforcing rings 6 and 7 in a sealing manner by the elastic force of the elastic material 5 without any gaps. Intrusion of oil or the like is completely prevented at the portion.

  Therefore, oil leakage can be reliably prevented by using this oil seal.

  Further, since the inside of the fixed seal portions 3a and 4b of the lip main body portion 4 and the covering portion 3 is hermetically sealed by the elastic material 5, oil or the like is prevented from entering the oil seal main body 1 from this portion. Corrosion of the garter spring 2 can be prevented.

  It can be applied to seal parts such as food processing machines, chemical manufacturing equipment, and engine crank seals that require heat resistance, wear resistance, chemical resistance, corrosion resistance, and bacteria resistance.

It is a partial vertical front view which shows the Example of this invention. (Example 1) It is a vertical front view which shows the seal board | substrate for shape | molding the oil seal main body which concerns on this invention. It is a partial longitudinal front view of the conventional oil seal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oil seal body 2 Garter spring 3 Cover part 3a Fixed seal part 4 Lip body part 4a Seal lip 4b Fixed seal part 5 Elastic material 6 Outer metal reinforcement ring 6 'Flange part 7 Inner metal reinforcement ring 7' Flange part

Claims (1)

  It has a garter spring covering part and a lip body part that constitutes a seal lip, which are molded entirely of fluororesin and connected to each other at the inner peripheral ends, and rises diagonally inward on the inner peripheral side. An oil seal main body having a sealing lip portion and a horizontal flange-shaped fixed seal portion formed on the outer peripheral side, and a garter spring loaded in the vicinity of an inner peripheral end between the lip main body portion and the covering portion. The outer L-shaped metal reinforcing ring, the inner L-shaped metal reinforcing ring closely fitted on the inner peripheral side thereof, and the inner and outer L-shaped metal reinforcing rings are loaded between the fixed seal portions of the oil seal body. An oil seal made of a fluororesin comprising an elastic material having soft elasticity pressure-clamped together with the fixed seal portion by each flange portion.

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