High power density, wide speed range and overall good efﬁciency are the primary demands of a modern hydrostatic trans- mission used in heavy earth moving machineries (HEMM). Conventional hydrostatic drive consisting of a displacement controlled pump and motor is sometimes inadequate to meet such requirements. Therefore, there is a need for examining alternative concepts of drives for HEMM. This article studies one of such alternatives where the motors are connected in parallel. In another solution, one motor is permanently connected to the load and the other one is connected to the load through gear unit. The latter is used during high-torque, low-speed demand of the vehicle. The challenge with the concept is the reconnection procedure, where the disconnected motor is accelerated, synchronized to the main motor output speed and ﬁnally locked to the output shaft, all in fraction of a second. Two different principles for the reconnection are proposed: to control the connection using a disc-type clutch, or to control it from the ﬂuid power system. The performances of the two systems are compared through bond graph model simulation with respect to pressure, speed and efﬁciency for the varying load demand usually catered by a HEMM. Keywords Hydrostatic system
Arabian Journal for Science and Engineering – Springer Journals
Published: Jun 4, 2018
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