摘要:
A road machine includes a travel switch to cause the road machine to start traveling, a hydrostatic transmission including a traveling hydraulic pump and a traveling hydraulic motor, a pump regulator to control the discharge quantity of the traveling hydraulic pump; and a controller to control the pump regulator using a pump command current. The pump regulator increases the discharge quantity of the traveling hydraulic pump as the pump command current increases, and the controller increases the pump command current to a predetermined value smaller than a maximum current value in response to the travel switch being turned ON. Alternatively, the pump regulator increases the discharge quantity of the traveling hydraulic pump as the pump command current decreases, and the controller decreases the pump command current to a predetermined value greater than a minimum current value in response to the travel switch being turned ON.
摘要:
A hydraulic pump assembly having a main pump, a charge pump and an auxiliary pump driven by a single shaft is provided. A pair of hydraulic porting members cooperates to feed and distribute hydraulic fluid between the three pump units, and a single inlet may be used to provide hydraulic fluid to the charge pump and the auxiliary pump.
摘要:
A mixer drum driving device includes a mixer drum, a hydraulic motor, a hydraulic pump, an auxiliary hydraulic pump for rotating the mixer drum for mixing by supplying pressure oil to the hydraulic motor independently of the hydraulic pump, and a direct-current brush motor for driving and rotating the auxiliary hydraulic pump. In the case of rotating the mixer drum for mixing, the mixer drum is driven and rotated by driving only the auxiliary hydraulic pump by the direct-current brush motor.
摘要:
A hydromechanical transmission 11 includes a hydraulic unit 23 and a gear unit 24. The gear unit 24 includes a first gear unit housing 29a defining a first sump 37a having a first set of gears 71. A second gear unit housing 29b defines a substantially smaller second sump 37b having a second set of gears 78, 79. An input shaft 62 extends longitudinally into the first sump 37a, and an output shaft 63 extends longitudinally from the second sump 37b. The longitudinal axes of the input and output shafts are substantially coaxial. A first hydraulic pump motor unit drive shaft 44 extends into the first sump 37a and is drivingly connected with the first set of gears, and a second hydraulic pump motor unit drive shaft 45 extends through the first sump 37a and into the second sump 37b and is drivingly connected with the second set of gears.
摘要:
A hydrostatic drive, to operate rotational industrial equipment such as a fan, a pump, a compressor, a conveyor or other drive used in industrial settings. The invention utilizes one or more variable displacement pump(s) configured to drive one or more fixed displacement hydraulic motor(s), or utilizing one or more fixed displacement pump(s) configured to drive one or more variable displacement hydraulic motor(s) or utilizing one or more variable displacement pump(s) configured to drive one or more variable displacement hydraulic motor(s). The pump(s) is powered by a fixed speed or variable speed motor or engine, most likely a fixed speed electric motor. The motor operates the rotational equipment with the purpose of process control, efficiency, and/or energy conservation.
摘要:
A pump system includes a closed-loop fluid circuit and an open-loop fluid circuit. The closed-loop fluid circuit includes a motor for rotating a first component connected to the closed-loop fluid circuit. A closed-loop pump drives the motor up to a first maximum rotational speed. The open-loop fluid circuit includes an open-loop pump for driving a second component connected to the open-loop fluid circuit. A control circuit includes a control valve for switching the outflow from the open-loop pump. The control valve selectively connects the open-loop pump to the closed-loop fluid circuit and simultaneously disconnects the open-loop pump from the open-loop fluid circuit. When the open-loop pump is connected to the closed-loop circuit, the closed-loop pump and the open-loop pump drive the motor at a second rotational speed greater than the first maximum rotational speed.
摘要:
A vehicle and drive system control method for a vehicle including first and second traction elements coupled to the vehicle, a variable displacement pump, a bi-directional variable displacement first motor coupled to the first traction element, and a bi-directional second motor coupled to the second traction element. The pump, and first and second motors are coupled fluidly in series with one another. A control unit can determine a desired speed for the traction elements, and determine pump, first and/or second motor displacements based on the desired speed. First and second speed sensors can sense output speeds of the motors, and the pump, first and/or second motor displacements can be determined based on the motor output speeds. Articulation and steering sensor signals can also be used to determine pump, first and/or second motor displacements.
摘要:
A method of assembly 140 for a hydromechanical powersplit transmission 11 and a method of disassembly and repair 140 includes providing a connecting plate 25 at step 140a. Primary and secondary pump motor unit drive shafts 44, 45 and rotating groups 42a, 42b, 43a, 43b and housing 26 are assembled onto the connecting plate 25 at steps 140b-140d to provide a hydraulic unit 23 on one side 23a of the connecting plate 25 for the transmission 11. Primary drive gear 76 and planetary gear set 71 and front gear housing 29a are assembled onto connecting plate 25 at steps 140e-140h. Secondary drive gears 78 and 79 and rear gear housing 29b and valves 53, 54, 55 and 56 are assembled onto connecting plate 25 at steps 140i-140k to provide a gear unit 24 for the transmission 11 that is assembled integrally with the hydraulic unit 23.
摘要:
A front wheel power system which may enable independent control of power to each wheel as well as yield direct control over average and differential front wheel torques.
摘要:
A hydraulic control system and a hydraulic control method are disclosed. The hydraulic control system comprises a first closed pump (P1) and a first engine (M1) connected with each other, a second closed pump (P2) and a second engine (M2) connected with each other, and a hydraulic motor (P3). The first closed pump (P1), the second closed pump (P2) and the hydraulic motor (P3) are connected in parallel. Compared with the prior art, the present hydraulic control system has advantages of wider engine model selection range, higher reliability and better micro-motion performance.