TRAVEL-MOTION HYDROMECHANICAL DRIVE OF RUBBER MOUNTED-MOUNTED EXCAVATOR Russian patent published in 2007 - IPC E02F9/22 B60K17/10 B60K31/06 

FIELD: mechanical engineering; excavators.

SUBSTANCE: proposed hydromechanical travel-motion drive of rubber tire-mounted excavator contains power plant, hydraulic drive consisting of pumps, hydraulic motors, travel-motion power hydraulic lines, drain hydraulic lines, servo control hydraulic lines, control units, hydraulic speed selector, hydraulic distributor with address travel spool which connects, in neutral position, travel-motion power hydraulic line with drain hydraulic line through restrictors, mechanical drive including gearbox with synchronizer, gearbox control mechanism with servodrive, propeller shafts, front and rear axles and wheels. Additional circuit is placed in servo control hydraulic line between hydraulic speed selector and servodrive of gearbox control mechanism consisting of two control two-position spools, servocontrol hydraulic lines logic OR hydraulic valve whose input taps are connected with travel-motion hydraulic lines, and output tap, with control space of first spool, connecting in first position, control space of second spool with drain hydraulic line, and in second position, hydraulic line of second speed of gearbox control mechanism servodrive. With second spool in first position, hydraulic lines of first and second speeds of hydraulic speed selector are connected with corresponding hydraulic lines of first and second speeds of gearbox control mechanism servodrive and is second position, hydraulic line of first speed of gearbox control mechanism servodrive is connected with drain hydraulic line, and hydraulic of second, with servo control pressure hydraulic line.

EFFECT: faultless changing over from second into first speed on the run.

2 dwg