| 摘要 |
Control device for the drive of the mixing drum of a transport concrete mixer with an internal combustion engine providing the travel drive, which combustion engine, by way of a hydrostatic transmission with adjustable pump, also drives the mixing drum, which is to be driven at constant speed of rotation even with the internal combustion engine running at different at speeds of rotation, but for loading and unloading must be driven at higher speed of rotation in the opposite direction of rotation, the pressure drop produced at a restriction point in the delivery flow of a constant delivery pump driven by the internal combustion engine acting on the control device of the pump in order to control the speed of rotation of the mixing drum, a pressure drop valve being arranged in series with the restriction point upstream of this and the pressure drop controlling a discharge valve connected to the control pressure line. <IMAGE>
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