Gear pump

About: Gear pump is a research topic. Over the lifetime, 7490 publications have been published within this topic receiving 38837 citations. The topic is also known as: Gear pump.

Power transmission structure of a working car

Abstract: A power transmission structure for a working car provided at the center thereof with a working machine, such as a mower. Power is transmitted by the simplest mechanism from a vertical engine to axles and the working machine. Two output pulleys are attached to a vertical rotary output shaft of the vertical engine. One pulley drives a pump shaft of an axle driving unit and the other pulley drives an input pulley of the working machine. A hydraulic power transmission and a differential gear are laterally eccentrically disposed within the axle driving unit. The hydraulic transmission comprises a hydraulic pump and a hydraulic motor. Power is transmitted from the rotary output shaft of the vertical engine to a vertical pump shaft of the hydraulic pump. A motor shaft of the hydraulic motor is operatively connected to the differential gear.

Gas turbine fuel pumping apparatus

Abstract: A fuel pumping apparatus, particularly useful for gas turbine engines, includes a dual element positive displacement fuel pump having a centrifugal type boost stage and, downstream, at least two parallel gear type elements. A controllable means for unlocking at least one of the elements includes a bypass line which provides a flow path to the inlet of the fuel pump from the pressurizing chamber of the gear elements which is used to urge end bearings of the gear elements into contact with the revolving gears thereby enabling the gears to pump fluid. Disposed in the bypass line is slide valve to open up the bypass line and unload and render the unloadable gear element inoperative. Control is provided by a Full Authority Digital Electronic Control and its associated Hydromechanical Unit which uses the fuel as a hydraulic fluid to actuate the slide valve.

Exhaust heat recovery system

Abstract: PROBLEM TO BE SOLVED: To provide an exhaust heat recovery system capable of reducing operation drag by a pump when a compression mechanism is driven by a rotary electric machine without extending a compound fluid machine in an axial direction. SOLUTION: A vehicular exhaust heat recovery system 11 includes a compound fluid machine 40 having a compression mechanism 60, an expansion mechanism 85, a gear pump 75, a motor generator 50 disposed on a same shaft. In the compound fluid machine 40, the gear pump 75 is driven at the same time when the compression mechanism 60 is driven by the motor generator 50. In Rankine cycle 20, a first channel 21a connecting a pump chamber of the gear pump 75 and a boiler 26, and a second channel 21b connecting the pump chamber of the gear pump 75 and a condenser 23 are connected by a bypass channel 28. A bypass valve 28a is disposed at the bypass channel 28. COPYRIGHT: (C)2011,JPO&INPIT

Hydraulic drive vehicle

Abstract: A hydraulic driving vehicle comprises front and rear transaxles incorporating respective hydraulic motors, and a pump unit separated from the front and rear transaxles. The pump unit incorporates a hydraulic pump having a pump shaft. A hydraulic circuit is formed by piping between the pump unit and the front and rear transaxles so as to circulate hydraulic fluid between the hydraulic pump and the hydraulic motors. A reservoir tank of the hydraulic fluid is connected to the hydraulic circuit by piping. A first cooling fan blowing air away from the pump unit and a second cooling fan blowing air toward the pump unit are disposed oppositely to each other with respect to the pump unit and drivingly connected to the pump shaft. At least a pipe for the piping of the hydraulic circuit and the reservoir tank passes an area blown by each of the first and second cooling fans.

System and method for controlling continuous mixer with melt pump

Abstract: An improved system and method for effectively controlling the operation of a continuous mixer/melter having an adjustable exit opening and connected to a melt pump is provided. The melt pump, which is preferably a gear pump, is operatively connected to an extruder/pelletizer. Operation of the gear pump is controlled in proportional relation to the energy requirements of the mixer/melter motor, the energy applied to adjust and maintain the exit opening of the mixer/melter, and the suction pressure measured at the interface between the mixer/melter and the gear pump. A microprocessor unit which receives and processes the input signals, calculates the energy requirements of the gear pump motor and compares these requirements with the actual torque, makes the necessary adjustments to the gear pump.