Method and device for the power shiftable change-over of a hydrostatic vehicle drive of a mobile construction machine
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United States of America Patent
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Jun 11, 2002
Grant Date -
N/A
app pub date -
Nov 29, 1999
filing date -
Mar 27, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
A method for the power-shiftable change-over of a hydrostatic vehicle drive of a mobile construction machine, comprising at least one hydrostatic capacity pump, a hydrostatic drive motor and a two-stage power-shift transmission, which drives the axle(s) of the construction machine via its drive shaft, wherein the power-shift transmission is shifted with a change-over valve, which method is to be modified such that an operationally safe automatic change-over in dependence on the load is possible between the shifting stages of the power-shift transmission. This object is achieved by activating a switch (7), which causes at least two pressure switches (3, 4) that are operatively connected to at least one switching element (5) to be successively activated with different hydraulic contact pressures for the load-dependent automatic change-over of the power-shiftable transmission (1), wherein the switching element (5) is activated by one or the other pressure switch (3, 4) in dependence on preset load conditions in the hydraulic circuit and this switching element then electrically actuates the change-over valve (6) in order to effect the change-over of the power-shift transmission (1).
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