Diaphragm seal type tensioner

Endless belt power transmission systems or components – Means for adjusting belt tension or for shifting belt,... – With sensor for controlling operation of shifter to correct...

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474110, F16H 722

Patent

active

050731491

ABSTRACT:
In a fluid tensioner for a camshaft drive belt, a piston rod is sealed by a flexible diaphragm having an enlarged inner end clamped in a conforming groove in the piston rod by a spring clamp. This maintains the inner end of the diaphragm at a fixed position on the piston rod, and provides a labyrinthine seal preventing leakage of fluid. A flattened portion of the piston rod fits a D-shaped opening in a cap to prevent rotation of the piston rod and premature failure of the seal. A dust seal located on the cap also has a D-shaped hole, aligned with the D-shaped hole in the cap, and conforming to the flattened part of the piston rod.

REFERENCES:
patent: 4708696 (1987-11-01), Kimura et al.
patent: 4713044 (1987-12-01), Nakamura et al.
patent: 4790796 (1988-12-01), Okabe et al.
patent: 4798563 (1989-01-01), Okabe et al.
patent: 4904230 (1990-02-01), Kawashima et al.
patent: 4950209 (1990-08-01), Kawashima et al.
Drawing from Japanese Patent laidopen publication 63-145859.
Drawing from Japanese Utility Model laid open publication 63-1954.

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