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US 4,539,001 AGranted
Tensioning device for belt or the like
AssigneeAisin Seiki Kabushiki Kaisha
InventorYoshio Okabe
Life of this patent
Estimating the term…
Abstract
A hydraulic autotensioner of a sealed type is used to give tension to a belt or a chain. The hydraulic autotensioner includes a body member having a large diameter oil chamber, a plunger having a small diameter oil chamber and a small passage, a piston whose head extends outside the body member and a spring for biasing the plunger.
Claims5
A hydraulic autotensioner of a sealed type comprising:
- a body member defining a large diameter oil chamber;
- a plunger sealingly inserted in a movable manner in said body member, said plunger having a small diameter oil chamber formed in the center thereof and a small passage which communicates said large and small diameter oil chambers;
- a piston sealingly inserted in said plunger in a movable manner, said piston having a head extending outside of said body member, said piston head having an end face defining a press face;
- a spring in said body member for biasing said plunger in the direction of said large diameter oil chamber;
- and
- a snap ring arranged at an opening of said body member and engaging said spring.
3 more elements
Dependencies are inferred from the claim text.