Chain tensioner and chain system
AssigneeNtn Corporation
InventorsKen Yamamoto, Katsuhisa Suzuki, Kazuki Kawashima, Tsuyoshi Niwa
Life of this patent
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Abstract
A chain tensioner keeps constant the tension of a chain for transmitting the rotation of an engine crankshaft to e.g. camshafts. It includes a housing having a cylinder chamber. A rod member has its rear end inserted in the cylinder chamber for pressing a chain. A tension adjusting spring biases the rod member outwardly of the housing. The chain tensioner further includes a hydraulic damper for damping a dynamic load applied to the rod member from the chain, and a thread engagement mechanism for preventing the rod member from retracting under a static load applied to the rod member.
Claims19
A chain tensioner comprising a housing having a cylinder chamber, a rod member having a rear end thereof inserted in said cylinder chamber for pressing a chain, a tension adjusting spring biasing said rod member outwardly of said housing, a hydraulic damper for damping a dynamic load applied to said rod member from the chain, and a thread engagement means for preventing said rod member from retracting under a static load applied to said rod member.
A chain tensioner comprising a housing having a cylinder chamber, a rod member having a rear end thereof slidably inserted in said cylinder chamber for pressing a chain, an oil supply means for supplying oil into the housing, and a thread engagement means for preventing said rod member from retracting under a static load applied to said rod member from the chain, said thread engagement means comprising threads in the shape of serrations, said threads having pressure flanks and clearance flanks, said pressure flanks having a greater flank angle than said clearance flanks, said threads having such a lead that said rod member can be moved outwardly under the force of said tension adjusting spring.
A chain tensioner comprising a housing having a cylinder chamber, a rod member having a rear end thereof slidably inserted in said cylinder chamber for pressing a chain, a tension adjusting spring biasing said rod member outwardly of said housing, and a thread engagement means for preventing said rod member from retracting under a load applied to said rod member from the chain in such a direction as to retract said rod member, said housing being formed with an oil feed port through which lubricating oil is supplied to threadedly engaging surfaces of said thread engagement means.
Dependencies are inferred from the claim text.