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A tensioner device for applying a predetermined tension force to a transmission belt extended between a driving wheel and a driven wheel supported on the body of an internal combustion engine, including a hydraulic automatic adjuster which comprises a plunger case fitted in a cylinder bore through a

A tensioner device for applying a predetermined tension force to a transmission belt extended between a driving wheel and a driven wheel supported on the body of an internal combustion engine, including a hydraulic automatic adjuster which comprises a plunger case fitted in a cylinder bore through a seal member and a plunger slidably and axially movably fitted in the plunger case, open edges of the plunger case and plunger being sealed from outside by means of a flexible boot. An extra feed oil chamber formed within the plunger is in communication with a feed oil source by means of a closed oil path through a feed oil port and in communication with an oil reservoir by means of another closed oil path through an oil discharge port provided in a spaced relation from the feed oil port. A high pressure oil chamber is provided below the plunger, and high pressure oil within the high pressure oil chamber may leak into the extra oil chamber through a sliding clearance provided between sliding surfaces of the plunger and the plunger case. The plunger has an open end formed as an oil injection port which allows injection of oil to the high pressure oil chamber, the injection oil port being oil-tightly sealed from outside by means of a cap.

대표청구항 ▼

A tensioner device for a wrapping connector driving device in an internal combustion engine in which an endless transmission belt is extended between a driving wheel and a driven wheel supported on an engine body, and a tensioner is pressed against the transmission belt on a loosening side thereof t

A tensioner device for a wrapping connector driving device in an internal combustion engine in which an endless transmission belt is extended between a driving wheel and a driven wheel supported on an engine body, and a tensioner is pressed against the transmission belt on a loosening side thereof to apply a predetermined tension force to the transmission belt, wherein said tensioner device has a hydraulic automatic adjuster comprising a plunger case provided on the engine body, a plunger slidably fitted in said plunger case and connected to the tensioner, a high pressure oil chamber defined below said plunger, an extra feed oil chamber provided internally of said plunger and communicated with said high pressure oil chamber through a valve port bored in a bottom wall of said plunger, a check valve encased in said high pressure oil chamber to close said valve port when pressure in said high pressure oil chamber increases and to open the valve port when pressure in said high pressure oil chamber decreases, and a tension spring encased in said high pressure oil chamber to bias said plunger in an extending direction to apply a predetermined tension force to said transmission belt on the loosening side thereof via the tensioner, wherein said plunger case is bored with a feed oil port and an oil discharge port in a spaced relation, said feed oil port being communicated with said extra oil chamber, said oil discharge port being communicated with an upper portion of said extra oil chamber through a leak oil chamber formed between said plunger case and said plunger, an outer open end between said plunger case and said plunger being sealed by means of a flexible boot.