Hydraulische Spannvorrichtung

摘要

To provide a hydraulic tensioner lifter which can reduce the filling time of oil pressure into an oil chamber (25) which is in a state wherein air is present therein and can sufficiently exhibit a vibration-damping function. A hydraulic tensioner lifter for applying tension to an endless power transmission band of a power transmission mechanism includes a plunger (24) fitted for sliding movement in an accommodation hole (23) of a tensioner body (B) and cooperating with the tensioner body (B) to define an oil chamber therebetween. An air-bleeder mechanism is provided for exhausting air in the oil chamber (25) to the outside of the oil chamber (25). The purge valve (P) has a check valve function of permitting the exhaustion of the air in the oil chamber (25) to the outside of the oil chamber (25) but blocking admission of air into the oil chamber from the outside of the oil chamber (25) and blocking discharging of the oil pressure in the oil chamber (25) to the outside of the oil chamber (25). In addition, the volume of oil in the oil chamber (25) may be decreased by a spring guide portion (39a) which is accommodated in the inside of the tensioner spring (26) for guiding the tensioner spring.