Hydraulic autotensioner unit having an external spring encirclin

Details Hydraulic autotensioner unit having an external spring encirclin Hydraulic autotensioner unit having an external spring encirclin

1996-11-26

2000-03-14

Stodola, Daniel P.

Endless belt power transmission systems or components

Means for adjusting belt tension or for shifting belt,...

Tension adjuster or shifter driven by electrical or fluid motor

474109, 474101, F16H 708, F16H 712

Patent

active

060366125

ABSTRACT:
A hydraulic autotensioner unit having an actuator which can be assembled easily and which can use a spring having a large coil diameter and thus a large spring constant. The autotensioner includes a pivotable arm and a tension pulley rotatably supported on the arm. The actuator is coupled to the arm to press the tension pulley against a belt. The actuator has a cylinder, a rod inserted in the cylinder, and a hydraulic damper mechanism mounted in the cylinder to damp the pushing force applied to the rod when it is pushed into the cylinder. The spring is provided around the cylinder, so that its size is not limited by a housing. A spring seat is fixed to one end of the rod by a pin. The spring seat is coupled to an engine block by a coupling piece. The spring and the spring seat can be mounted after mounting the hydraulic damper within the cylinder, so that the actuator can be assembled easily.

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