Title: Damping-force control mechanism in a hydraulic shock absorber

Abstract: A damping force control mechanism in a hydraulic shock absorber having a piston disposed within a cylinder casing so as to define a pair of hydraulic chambers. A plurality of ports are formed through the partition to enable passage of hydraulic fluid between the hydraulic chambers and an orifice plate mounted on the partition enables stepwise rotation relative thereto. Orifice apertures formed through the plate pass one of the ports upon rotation of the orifice plate where the apertures have differential diameters so as to afford differential resistances to hydraulic fluid passing therethrough. At least two of the apertures are upon stepwise rotation of the orifice plate, in fluid communication with one port, and at least one of the apertures in communication with the port are retained in this state upon a further rotation of the orifice plate.

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Other info:

Inventors: Nishikawa, Masao (Tokyo, JP)
Yamamoto, Hitoshi (Asaka, JP)

Application Number: 920997
Filing Date: 1978-06-30
Publication_date: 1980-03-04
Assignee: Honda Giken Kogyo Kabushiki Kaisha (Tokyo, JP)
Primary Class(es): 188/319.2 137/625.31, 251/206
Other Classes:
US Patent Ref:

1144530	Jun, 1915	De Fernanzo	188/319.
1618326	Feb, 1927	Cosentino	188/319.
3589399	Jun, 1971	Vignes	137/625.
3827538	Aug, 1974	Morgan	188/319.

Other Refs: 1175694

Mar, 1959	FR

Primary Examiner: Kazenske, Edward R.
Assistant Examiner:
Attorney: Haseltine, Waters & Lake