초록 ▼

A sealing system for sealing high liquid pressure and containing a wiper lip in either of two forms. The light pressure seal includes a seal casing, a seal body including a lip seal, a snap ring and a plastic back-up ring, and the wiper lip seals on either a radial or an axial surface. The casing ma

A sealing system for sealing high liquid pressure and containing a wiper lip in either of two forms. The light pressure seal includes a seal casing, a seal body including a lip seal, a snap ring and a plastic back-up ring, and the wiper lip seals on either a radial or an axial surface. The casing may have radial and axial flanges or a radial flange only. The space between the two seals may be filled with grease.

대표청구항 ▼

What is claimed is: 1. A multi-piece fluid seal assembly for use with a rotary shaft of a power steering mechanism comprising; a first piece of said seal assembly forming a portion of a pressurized fluid-containing housing, said first piece including a high-pressure seal comprising: an annular seal

What is claimed is: 1. A multi-piece fluid seal assembly for use with a rotary shaft of a power steering mechanism comprising; a first piece of said seal assembly forming a portion of a pressurized fluid-containing housing, said first piece including a high-pressure seal comprising: an annular seal casing having an axial flange, a radial flange and an axially offset radial flange extending from said radial flange which forms the innermost radial portion of said annular seal casing; and an annular elastomeric seal body including a flexible neck section oriented toward an oil side of said seal body and supporting circumferentially continuous frusto-conical air side and oil side surfaces meeting to define an annular seal band that extends from said flexible neck section toward the oil side of said seal body, and having an annular pocket defined at least in part by said axially offset radial flange; a resinous seal backup ring disposed radially inside said annular pocket and being at least partially supported by said axially offset radial flange against axial displacement, the resinous seal backup ring being positioned by, location of said pocket, such that a radially inner, axially extending surface of said resinous seal backup ring can make contact with said rotatable shaft during operation of said seal assembly; a metal snap ring for retaining said annular seal casing in said fluid-containing housing, said metal snap ring contacting an outer surface of said radial flange near a point where said radial flange meets said axial flange; an elastomeric axially extending wiper lip, bonded to said axially offset radial flange; an elastomeric radial dust lip, bonded to said axially offset radial flange and being radially innermost from said elastomeric axially extending wiper lip; and a second piece of said multi-piece seal assembly comprising: an annular stiffener with an L-shaped cross-section defined by a radially extending stiffener flange and an axially extending radially inner stiffener flange, wherein said elastomeric axially extending wiper lip, bonded to said axially offset radial flange of said first piece, bears on said radially extending stiffener flange; an annular excluder seal elastomeric seal body bonded to said annular stiffener, and surrounding said axially extending radially inner stiffener flange such that a radial surface of said elastomeric seal body is positioned to make sealing contact with said shaft; an axially angled, radially extending annular excluder lip, that extends outwardly away from said annular seal casing, and also being bonded to a radially outermost end of said radially extending stiffener flange of said annular stiffener and forming a rotary excluder seal between said annular stiffener and said pressurized fluid-containing housing; wherein a space formed by an axially extending inner bore surface of said housing, air side surfaces of said radial flange and of said axially offset radial flange of said seal casing, an inner oil side facing surface of said radially extending stiffener flange and said axially extending wiper lip, contains grease. 2. A fluid seal assembly as defined in claim 1 wherein said seal casing axial flange has a portion of said annular elastomeric seal body covering a radially outermost surface of said axial flange and forming a fluid-tight interference fit with said axially extending inner bore surface of said fluid-containing housing. 3. A fluid seal assembly for installation between an annular fluid-containing housing and a rotatable shaft forming part of a high pressure environment, said fluid seal assembly comprising, in combination, an annular high pressure seal and at least one annular excluder seal, said excluder seal, in sealing relation to said rotatable shaft and said housing, comprising: an annular stiffener with an L-shaped cross-section defined by a radially extending stiffener flange and an axially extending radially inner stiffener flange; an annular excluder seal elastomeric seal body bonded to said annular stiffener, and surrounding said axially extending radially inner stiffener flange such that a radial surface of said elastomeric seal body is positioned to make sealing contact with said shaft; an axially angled, radially extending annular excluder lip, that extends outwardly away from said annular high pressure seal, and also being bonded to a radially outermost end of said radially extending stiffener flange of said annular stiffener and forming a rotary excluder seal between said annular stiffener and said annular fluid-containing housing; wherein said high pressure seal comprises: an annular casing member comprising an axial flange having a radially inner surface and a radial flange having an axially offset radial flange extending therefrom and forming a radially innermost portion; a metal snap ring engaging said radial flange and retaining said casing against being expelled from said housing, said high pressure seal having an annular rubber primary lip element including a portion bonded to said radially inner surface of said axial flange and to one face of said radial flange thereof; a lip body portion and a flex neck portion joining said lip body portion to said bonded portion, said lip body portion including air and oil side frusto-conical surfaces meeting along a path of intended contact to form a seal band with said associated rotatable shaft; a pocket portion lying between said lip body portion and said radially innermost portion of said radial flange; a synthetic resinous annular back-up ring disposed in said pocket portion, the resinous seal backup ring being positioned by, location of said pocket portion, such that a radially inner, axially extending surface of said resinous seal backup ring can make contact with said rotatable shaft during operation of said seal assembly; an elastomeric axially extending wiper lip, bonded to said axially offset radial flange, and bearing on said radially extending stiffener flange; and an elastomeric radial dust lip, bonded to said axially offset radial flange and being radially innermost from said elastomeric axially extending wiper lip. 4. A fluid seal assembly as defined in claim 3 wherein said excluder lip contacts a radial end face surface on said fluid-containing housing.