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
Patent
1997-08-14
1999-06-22
Hannon, Thomas R.
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
F16H 708
Patent
active
059137428
ABSTRACT:
A tensioner for an endless transmitting member is provided to reliably prevent the loosening of an endless chain, while preventing the occurrence of an incorrect meshing of the endless chain with sprockets. A plunger holder is biased in an advancing direction by the action of a first spring supported in a housing, and a plunger, carried in the plunger holder, is biased in an advancing direction by the action of a second spring having a spring constant larger than that of the first spring. Only the movement of the plunger holder in the advancing direction is permitted by a ratchet mechanism mounted between the plunger holder and the housing. During operation of the engine, the advancing movement of the plunger holder is inhibited by the hydraulic pressure transmitted to a hydraulic pressure chamber, and the plunger is advanced and retracted in accordance with a variation in tension of the endless chain. When the engine is stopped, the ratchet mechanism is operated in accordance with the elongation of the endless chain due to wearing to advance the plunger holder one pitch at a time along with the plunger.
REFERENCES:
patent: 5073150 (1991-12-01), Shimaya
patent: 5304099 (1994-04-01), Deppe et al.
patent: 5366415 (1994-11-01), Church et al.
patent: 5720684 (1998-02-01), Mott
Hirano Kouji
Kawashima Fuminori
Nakamura Kensuke
Okita Tomoki
Yamada Shinji
Hannon Thomas R.
Honda Giken Kogyo Kabushiki Kaisha
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