Drive system for machines and vehicles, with a hydraulic and mechanical transmission arranged thereafter
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 10, 1990
Grant Date -
N/A
app pub date -
Feb 15, 1989
filing date -
Mar 8, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A drive system for machines and vehicles with a hydraulic and mechanical transmission arranged thereafter having a driving motor and a control member which can continuously vary the speed of the motor. A hydraulic converter also controlled by a control member dependent upon the speed of the driving motor and the running pressure of the motor is also provided, in which a transmission arranged after the converter and a shifting mechanism is connected to an electronic control circuit so that an operating element for shifting gears of the transmission may achieve a comfortable shifting behavior for the transmission. Shifting from a high gear to a low gear will occur only under the following conditions: (a) before shifting, the output speed of the hydraulic converter is below a certain predetermined value, and (b) before shifting, the transmission ratio of the converter reaches a specific minimum value caused by the working pressure of the motor.
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