Improved seal for gas springs and the like

Details Improved seal for gas springs and the like Improved seal for gas springs and the like

F - Mech Eng,Light,Heat,Weapons

16

J

F16J 15/32 (2006.01) F16F 9/02 (2006.01) F16F 9/36 (2006.01) F16J 15/56 (2006.01)

Patent

CA 2267329

A seal (12) that is particularly suitable for use in a gas spring (14) and other high pressure hydraulic and pneumatic sealing applications and that minimizes the leakage of relatively high pressure gas and lubricating oil from the rod end of the gas spring or other applications. The generally annular seal body (62) includes a number of convex sealing lobes (74, 76, 78, 82, 84) on its radially inwardly and outwardly facing surfaces. All of the sealing lobes have a predetermined radius and project radially beyond the plane of their respective surfaces. The axial facing surfaces (68, 72) of the seal body (62) are generally flat or non-concave. The seal also includes a wiper insert (94) secured in a recess (92) in one comer of the radially inwardly facing surface (64) of the seal body (62). When the seal body (62) is compressed between the relatively movable, annularly spaced piston rod (32) and cylinder (16), the compression induced stress in the seal causes the seal body (52) and insert (94) to form an effective gas and oil seal.

L'invention concerne un joint (12) convenant particulièrement à l'utilisation dans un ressort à gaz (14) et d'autres applications de joints pneumatiques et hydrauliques haute pression et minimisant les fuites de gaz et d'huile de lubrification à pression relativement élevée de l'embout du ressort à gaz ou d'autres applications. Le corps de joint généralement annulaire (62) comporte plusieurs lobes d'étanchéité convexes (74, 76, 78, 82, 84) sur ses surfaces orientées vers l'intérieur et l'extérieur. Tous les lobes d'étanchéité présentent un rayon prédéterminé et saillent radialement au-delà du plan de leurs surfaces respectives. Les surfaces frontales axiales (68, 72) du corps de joint (62) sont généralement plates ou non concaves. Le joint présente également une pièce rapportée (94) fixée dans un évidement (92) situé dans un angle de la surface tournée vers l'intérieur, dans le sens radial (64), dudit corps de joint (62). Lorsque ledit corps de joint (62) est comprimé entre la tige de piston (32) relativement mobile et le cylindre (16), lesquels sont à un certaine distance l'un de l'autre dans le sens annulaire, une contrainte est induite par compression dans le joint, le corps de joint (52) et la pièce rapportée (94) formant ainsi une étanchéité efficace contre les gaz et l'huile.

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