Fluid-pressure and analogous brake systems – With pump – Pressure control
Patent
1998-02-10
2000-02-22
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
With pump
Pressure control
303 2, 180306, B60T 1318, B60T 1314
Patent
active
060271795
ABSTRACT:
An emergency stop apparatus for a hydraulic speed change gear is capable of quickly reducing the pump discharge to zero in order to stop the traveling of a vehicle at the time of an emergency, where the vehicle employs a hydraulic travel drive system, such as in construction equipment, agricultural equipment, etc. The apparatus includes a variable capacity type hydraulic pump (41); a hydraulic motor (43); a travel operating level (59); an intermediate lever, which is connected to the travel operating lever by a wire cable; a servo valve (52); a servo valve input lever (57), which is attached to the servo valve; and an interlock device between the intermediate lever and the servo valve input lever. When the interlock device is engaged, the servo valve input lever is actuated according to the operation of the travel operating lever so as to displace the servo valve in accordance with the operating amount of the travel operating lever to increase or decrease the discharge of the variable capacity type hydraulic pump so as to change the rotational speed of the hydraulic motor. When the interlock device is disengaged, the servo valve input lever is not connected to the intermediate lever. An emergency stop switch can actuate a solenoid valve to pass pressurized oil to a detent means to effect disengagement of the servo valve input lever from the intermediate lever.
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patent: 5492511 (1996-02-01), Kozminski
patent: 5542891 (1996-08-01), Kettle, Jr. et al.
patent: 5884984 (1999-03-01), Arai et al.
Komatsu Ltd.
Oberleitner Robert J.
Siconolfi Robert A.
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