Hydraulic actuator for transmissions having reduced noise

Details Hydraulic actuator for transmissions having reduced noise Hydraulic actuator for transmissions having reduced noise

2008-03-26

2011-11-29

Hannon, Thomas R (Department: 3656)

Machine element or mechanism

Control lever and linkage systems

Multiple controlled elements

C091S399000, C091S401000

Reexamination Certificate

active

08065930

ABSTRACT:
The present invention provides a three position hydraulic piston assembly for a gear ratio change mechanism for a transmission exhibiting reduced gear shift noise. The three position hydraulic piston assembly includes a master piston and motion retarding assemblies that act near both travel limits of the master piston. The master piston includes symmetrical passageways that provide hydraulic fluid flow to small chambers at each end of the piston that are closed off as the piston approaches its travel limits. Hydraulic fluid trapped in the chambers decelerates the piston and is bled off through an orifice allowing the piston to reach its travel limit and quickly and quietly engage a gear ratio.

REFERENCES:
patent: 3094900 (1963-06-01), Wandel et al.
patent: 6553889 (2003-04-01), Migliori

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