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.

Drive for a double-worm extruder

Abstract: Two worms of a worm extruder are connected to drive shafts of different lengths journaled in a transmission housing. For driving one of the worms, a first gear is keyed to the longer drive shaft and is driven by the motor gear and the electric motor. The second worm is driven by a further shaft, one end of which has a gear meshing with the second gear keyed to the short drive shaft so that the gear of this further shaft and the gears of the two drive shafts lie in a common plane. The further shaft is driven by a gear meshing with the motor shaft or by a separate motor. With this apparatus torque distribution is improved and the number of gears and components of the transmission is reduced.

Continuous speed-shifting device

Abstract: The continuous speed-shifting device of the present invention is provided with the first, second and third rotary shafts, a differential gear mechanism having the first gear element connected to the third rotary shaft, a variable speed pulley mechanism which connects the second and the third rotary shafts speed-changeably by a belt, a driving power gear mechanism which connects the first rotary shaft to the second or the third gear element of the differential gear mechanism and a circulating power gear mechanism which connects the second rotary shaft to the third or the second gear element of the differential gear mechanism. According to switching of the advancing and the retreating, the first rotary shaft and the driving power gear mechanism or the second rotary shaft and the circulating power gear mechanism are connected or disconnected by the gear clutch. Large driving power transmitted from the first rotary shaft to the differential gear mechanism is passed through the gear mechanism but small circulating power returned to the first rotary shaft from the differential gear mechanism is always passed through the pulley mechanism. When the first rotary shaft and the driving power gear mechanism or the second rotary shaft and the circulating power gear mechanism are connected with each other by a gear clutch, rotation of the third rotary shaft is made zero to obtain a neutral state.

Load shift transmission with stepless hydrostatic gearing

Abstract: A load shift transmission with stepless hydrostatic gearing comprising: a hydrostatic transmission having a displacement machine with an adjustable volume and a displacement machine with a constant volume; a five-shaft planetary gear transmission having: a coupling shaft for the constant volume displacement machine, the coupling shaft formed by a first planet gear section which meshes with a first sun gear and a first ring gear; a start up coupling shaft formed by a second planet gear section which meshes with a second sun gear; a slow running coupling shaft formed by a third planet gear section which meshes with a third sun gear; a fast running coupling shaft formed by the ring gear of the first planet gear section; an input shaft formed by a planet gear carrier on which the first, second and third planet gear sections are mounted; and an output shaft, wherein the coupling shafts alternately transfer the requisite power through subsequent gear shifting steps to the output shaft.

Continuously-variable-gear-ratio automatic transmission

Abstract: A high efficiency automatic transmission having a continuously variable gear ratio is disclosed. The preferred embodiment of the transmission comprises a housing, an input shaft, an output shaft, an intermediate shaft, a plurality of internal gears and a fluid brake or other rotation resistance means at one end of the intermediate shaft. The transmission end of the input shaft is fixedly attached to a orbital gear carrier which carries a plurality of orbital gears. The orbital gears drive an intermediate driven gear fixed to one end of the intermediate shaft. A one way drive means carried by the intermediate shaft drives a gear train when engaged. An output ring gear fixed to the output shaft is driven both by the orbital gears and by the gear train. When the input shaft is connected to a source of rotary power, the orbital gear carrier turns with the input shaft, carrying the orbital gears with it. The orbital gears force either the output gear or the intermediate driven gear or both to rotate. Rotation of the intermediate driven gear drives the one way drive means which in turn drives the gear train. Both the gear train and the orbital gears drive the output gear; however, where the torque on the output shaft as reflected through the gear ratios is greater than the torque of the fluid brake, the greatest drive impetus is applied by the gear train. As the load torque on the output shaft decreases relative to the fluid brake torque, the driving impetus is increasingly produced by the orbital gears. This process can be aided by increasing the braking force applied by the fluid brake to increase resistance to rotation of the intermediate shaft. Once the output gear speed exceeds that which would be produced by the gear train, the one way drive means disengages and all of the output drive impetus is provided by the orbital gears. If the intermediate shaft is stopped (either by increasing the brake torque or because the reflected opposing torque of the output load is less than the brake torque), the output obtains maximum speed and the transmission is in a maximum overdrive condition.