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US 4,542,662 AGranted
Mechanical gear selector
AssigneeZahnradfabrik Friedrichafen
InventorGerold Bieber
Life of this patent
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AssigneeZahnradfabrik Friedrichafen
InventorGerold Bieber
Estimating the term…
In a mechanical gear selector for a synchronized gear change, there is disposed an automatic force amplifier--primarily a hydrostatically operating automatic amplifier--that amplifies or amplifies the force introduced depending on the magnitude thereof, no separate energy such as a fluid pump being needed therefor, and the amplification also taking place only when needed, primarily for the synchronization of gears. Between a force input shaft and a casing disposed concentrically thereto, which casing also transmits the amplified force, there is situated in connection with an annular and a pressure space the force amplifier proper and a spring element for the defined amplification threshold. On the design depends from what input force amplification starts. From a defined amplified pressure, the amplifying action is terminated by a pressure-reducing valve so that the transmission of force is continued practically with this pressure that has been reached or a pressure therebelow.
A gear selector for a synchronized gear transmission change comprising a mechanical gear change mechanism and a hydrostatic device, said device including an input means adapted to receive a gear change force, an output means to apply a gear change force to said gear change mechanism, a force amplifying means operable to couple said input means to said output means to increase said gear change force received by said input means without supply of exterior pressure, and a resilient element disposed between the input means and output means for controlling the threshold gear change force at which said force amplifying means becomes operable.
Dependencies are inferred from the claim text.