초록 ▼

A control drive is provided for the drive of a vehicle, whose steering is effected by a differential driving of the drive wheels of the two sides of the vehicle, where the drive wheels of each vehicle side are driven through a hydrostatic drive unit, whose final control element is connected with a s

A control drive is provided for the drive of a vehicle, whose steering is effected by a differential driving of the drive wheels of the two sides of the vehicle, where the drive wheels of each vehicle side are driven through a hydrostatic drive unit, whose final control element is connected with a servo piston capable of sliding in an operating cylinder and is acted upon from both sides, in which case the servo piston is acted upon from one side for controlling the travel speed and the control pressure determining the travel speed is reduced for effecting a turn on one side of the vehicle for large turning radii, and for smaller turning radii a pressure is additionally built up on the opposite side of the servo piston, the said pressure being derived from the control pressure determining the travel speed on the other side of the vehicle.

대표청구항 ▼

In a control for the drive of a vehicle with differential-speed steering and with a hydrostatic drive unit on each side of the vehicle for operating the drive wheels, a final control element at each of the two drive units controlling the operation thereof and each connected with a spring-loaded serv

In a control for the drive of a vehicle with differential-speed steering and with a hydrostatic drive unit on each side of the vehicle for operating the drive wheels, a final control element at each of the two drive units controlling the operation thereof and each connected with a spring-loaded servo piston capable of sliding in an operating cylinder, the improvements comprising a pressure chamber on each side of the each servo piston in the operating cylinder, means providing an arbitrarily adjustable control pressure on the servo piston, a first pair of control pressure pickoffs for controlling the forward and reverse travel which can be connected with operating cylinders of the drive units of both sides of the vehicle, two additional second pair of control pressure pickoffs, each assigned to one turning direction connected with the operating cylinder of the drive unit of the vehicle side on the inside of the curve, each servo piston being capable of being acted upon by the control pressure pickoff of said first pair of control pressure pickoffs assigned to the control on one side for controlling the direction and speed of travel, and, on the other side, may be acted upon by a control pressure pickoff of the one pair of said second pairs of pickoffs assigned to turning travel for controloing the turning radius, a pilot valve located in the connection line between a control pressure pickoff of said one pair of said second pairs of pickoffs assigned to turning travel and the operating cylinder of the assigned drive unit, an arbitrarily actuable direction and speed selective lever, means for switching said pilot valve as a function of the position of said arbitrarily actuable direction and speed selective lever, said pilot valve connecting the control pressure pickoff assigned to turning travel with a pressure chamber of an operating cylinder of the drive unit on the inside of the curve, the other pressure chamber of which operating cylinder is acted upon by control pressure from the control pressure pickoff of said first pair of pickoffs that determines at least one of the speed and the direction of travel, means for first operating the control pressure pickoff of said one pair of second pairs of pickoffs assigned to one turning direction of the control pressure pickoff pair of said second pairs of pickoffs determining the direction and radius of turning and designed to reduce the control pressure in the chamber of the operating cylinder acted upon by the control pressure pickoff of said first pair of pickoffs that determines the direction and speed of travel in the case of a slight actuation, and then with increased actuation simultaneously operating a control pressure pickoff of said first pair of pickoffs furnishing a control pressure on the ppposite side of the servo piston, and a connection from said control pressure pickoff of said first pair of pickoffs to the pressure supply at the outlet of the control pressure pickoff of said first pair of pickoffs determining the speed of travel.