초록 ▼

A hydraulic control system for work vehicles including a control unit to control the steering wheels of a vehicle via a cylinder and a priority valve which by a first load-sensing system controls the pressure fluid flow to the control unit and to a subsequent proportional valve group. By a second lo

A hydraulic control system for work vehicles including a control unit to control the steering wheels of a vehicle via a cylinder and a priority valve which by a first load-sensing system controls the pressure fluid flow to the control unit and to a subsequent proportional valve group. By a second load-sensing system the proportional valve group controls the pressure fluid flow to secondary hydraulic motors or work cylinders to control the work tools of the vehicle. The control system also includes an open-centre valve connection and a fixed displacement pump. The first load-sensing system is connected with a second load-sensing system, whereby drop-off of the pressure fluid flow to the control unit is avoided at simultaneous operation of the latter and of one or several of the proportional valves as is the case with known control systems. Hereby a control system is provided which is particularly agreeable to operate for the driver of the work vehicle.

대표청구항 ▼

[ I claim:] [1.] A hydraulic control system for a work vehicle, including a control unit connected to a first hydraulic work machine for controlling steering wheels of the vehicle, a primary priority valve having a first load-sensing system, said first load-sensing system having means to control pre

[ I claim:] [1.] A hydraulic control system for a work vehicle, including a control unit connected to a first hydraulic work machine for controlling steering wheels of the vehicle, a primary priority valve having a first load-sensing system, said first load-sensing system having means to control pressure fluid flow to the control unit and pressure fluid flow to at least one subsequent proportional valve, and including a second load-sensing system having means to control pressure fluid flow to a connected secondary hydraulic work machine for controlling a work tool of the vehicle, and including an open-center valve connection to a tank and a fixed displacement pump, the first load-sensing system being connected to the second load-sensing system for joint operation of the primary priority valve.