Utility vehicle drive system
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United States of America Patent
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May 19, 2015
Grant Date -
Jun 27, 2013
app pub date -
Dec 24, 2012
filing date -
Dec 23, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A hybrid drive system for a utility vehicle (1) which operates with an internal combustion engine (12) and an electrical generator (80), motor (86) and storage means (84). Auxiliary hydraulic functions (93,94) may be powered by the electric motor (86). An output of the engine (12) is mechanically coupled to a multi-ratio transmission (10) which has a hydrostatic driveline (24) and an output which is mechanically coupled to propulsion means. With the engine switched off, the electric motor powers a hydraulic pump (91) which generates pressurized fluid to operate auxiliary functions. In addition, the pressurized fluid may be exploited in a secondary propulsion mode to drive a hydraulic motor (92) in the hydrostatic transmission to propel the vehicle in a low emission, low noise output mode.
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