Motor grader

摘要

A motor grader is provided with an engine, front and rear travel wheels, a transmission, a work implement, a control unit, and a vehicle speed adjusting knob. The transmission has hydraulic clutches for switching between forward and reverse travel and for switching between speed stages. The transmission changes the speed of power from the engine, and transmits the power to either the front travel wheels and/or to the rear travel wheels. The work implement includes a blade for grading. During travel at a forward first speed, the control unit causes one of the hydraulic clutches of the transmission to operate as a braking clutch such that the motor grader travels at a very low speed. The vehicle speed adjusting knob is a member for setting the vehicle speed during very low-speed travel to an arbitrary speed.

主权项

1. A motor grader comprising:
an engine; front and rear travel wheels; a transmission including a plurality of hydraulic clutches configured to switch between forward and reverse travel and to switch between speed stages, to change speed stages of a motive force from the engine, and to transmit the motive force to at least one of the front and rear travel wheels; a work implement including a blade configured to grade; a control unit configured to control the hydraulic clutches with command signals, the control unit being configured to execute a very low-speed control in which one of the hydraulic clutches of the transmission is operated as a braking clutch to enable a very low-speed travel when traveling at a forward low-speed stage, the one of the hydraulic clutches operated as braking clutch being operated in double engagement with another of the hydraulic clutches that is engaged to achieve the forward low-speed stage; and a very low-speed adjusting member configured to adjustably set a vehicle speed during the very low-speed travel to an arbitrary vehicle speed.