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US 11,143,274 B2Granted
Chain tensioner
AssigneeTsubakimoto Chain Co.
InventorYoji Sato
Life of this patent
Estimating the term…
Abstract
To provide a chain tensioner that can suppress oil leakage from a gap between a plunger bore and a plunger to achieve stable damping characteristics and that can avoid an increase in production cost, with a simple structure. The chain tensioner includes a packing member that is provided on an inner circumferential side of the plunger bore and that suppresses oil leakage from a cylindrical outer surface of the plunger. The plunger is provided with an oil leak passage that extends from an oil pressure chamber inside the plunger to the outside.
Claims5
A chain tensioner comprising:
- a tensioner body having a cylindrical plunger bore with an open end;
- a cylindrical plunger slidably inserted in the cylindrical plunger bore and biased toward an open side of the cylindrical plunger bore;
- and an oil pressure chamber formed between the cylindrical plunger bore and the cylindrical plunger,
- a packing member being provided on an inner circumferential side of the cylindrical plunger bore and preventing oil from leaking from a cylindrical outer surface of the cylindrical plunger,
- an oil leak passage being formed in the cylindrical plunger such as to extend from the oil pressure chamber inside the cylindrical plunger to an outside,
- an extension member slidable relative to the cylindrical plunger is provided on the open side of the cylindrical plunger bore in a manner fixedly attachable to the tensioner body,
- an accommodating part that accommodates the packing member is provided on an inner circumferential surface of the cylindrical plunger bore,
- the accommodating part is expanded on the open side of the cylindrical plunger bore, and
- the extension member is configured to be able to enter the accommodating part to a position where the packing member is compressed in an axial direction of the cylindrical plunger.
6 more elements
Dependencies are inferred from the claim text.