Hydraulic chain tensioner
AssigneeDr. Ing. h.c.F. Porsche Aktiengesellschaft
InventorWalter Mittermeier
Life of this patent
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Abstract
A hydraulic chain tightener with a hollow piston longitudinally movably guided within a hydraulic housing; the hollow piston is closed off at the top by a throttling plug and the hydraulic housing is to be vented by way of the channels of the throttling plug; an expansion space is formed between the throttling plug and the pressure space present at the bottom side of the hollow piston, which is closed off with respect to the pressure space by a ball check valve; during chain impacts on the hollow piston and corresponding pressure increases in the pressure space, the check valve opens and enables by pump action a rapid venting of the hydraulic housing.
Claims4
A hydraulic chain tightener for internal combustion engines, comprising hollow piston means longitudinally movably guided within a bore of a hydraulic housing and serving for the chain tensioning, said hollow piston means being connected at one end to a pressures space means and including at its opposite end a throttling plug means facing the chain, the air being able to escape out of the hydraulic housing means by way of the throttling plug means, characterized in that an expansion space means is formed between the throttling plug means and the pressure space means, which is adapted to be closed with respect to the pressure space means by a check valve means.
Dependencies are inferred from the claim text.