Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1987-05-13
1989-05-09
Wright, Dirk
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74335, 74336R, 74863, B60K 4118, B60K 2010
Patent
active
048278025
ABSTRACT:
An apparatus for automatically operating the transmission of a small internal combustion engine includes an elongate actuator rod pivotally attached at one end to a pivotally mounted gear shift lever. The other end of the rod is contained in a housing, and attached to a diaphragm reciprocable in the housing and dividing the housing into two fluid chambers. Separate fluid conduits join each chamber with the air intake passage of the engine, and are normally open to maintain a relative vacuum in each chamber. A microprocessor receives electrical input signals corresponding to engine RPM, vehicle velocity, throttle setting and other vehicle operating parameters, and generates output signals for momentarily and selectively closing the fluid conduit to one of the chambers, and simultaneously opening the selected chamber to a source of atmospheric pressure. The pressure differential moves the diaphragm and actuator rod to pivot the gear shift lever in a selected direction, thereby shifting the transmission to the next higher or next lower gear. An auxiliary butterfly valve, in the intake passage upstream of the fluid conduit connections with the air intake, is controlled by the microprocessor to close off air flow in the intake passage during shifting.
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Haugen Orrin M.
Niebuhr Frederick W.
Nikolai Thomas J.
Wright Dirk
Yamaha Hatsudoki Kabushiki Kaisha
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