초록 ▼

A hydraulically operated chain or belt tensioner is provided which in a preferred embodiment (500) features a piston or dynamic plunger (56) slidably received within a bore (54) of a housing (52) that includes a fluid chamber (65) that is vented by at least one air vent (76) extending through housin

A hydraulically operated chain or belt tensioner is provided which in a preferred embodiment (500) features a piston or dynamic plunger (56) slidably received within a bore (54) of a housing (52) that includes a fluid chamber (65) that is vented by at least one air vent (76) extending through housing (52) that is oriented relative bore (54) such that tensioner (500) can be rotated a predetermined angular amount alpha relative horizontal with vent (76) maintaining a slope (B) greater than zero enabling entrapped air to escape from chamber (64) and preventing a substantial amount of fluid to drain therefrom by gravity when unpressurized.

대표청구항 ▼

An improved fluid operated endless chain or belt tensioning device of the type comprising a body member having a bore therein having an open end and a closed end, a dynamic plunger slidably received in the body member bore, said dynamic plunger having an exposed end operatively engaging the chain or

An improved fluid operated endless chain or belt tensioning device of the type comprising a body member having a bore therein having an open end and a closed end, a dynamic plunger slidably received in the body member bore, said dynamic plunger having an exposed end operatively engaging the chain or belt for the tensioning thereof and having an opposite end within the body member bore in spaced-apart relationship with the closed end thereof defining a first fluid chamber therebetween, and means enabling the pressurized fluid to enter the first chamber and urge the dynamic plunger away from the body member closed end and cause the chain or belt to be displaced in a direction for a distance effective for the tensioning thereof, said improvement characterized by said device including at least one vent extending through the body member and intersecting the first chamber, said vent oriented relative the body member bore such that the exit thereof from the body member is higher than the intersection thereof with the first chamber when the body member bore is in an upright vertical position by an amount effective to enable the device to be transversely rotated a predetermined angular amount relative a horizontal plan whilst enabling entrapped air to escape from the first chamber and preventing a substantial amount of the fluid to drain therefrom by gravity when not pressurized.