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.

Thrust actuator driven by motor

Abstract: PROBLEM TO BE SOLVED: To make possible the large equivalent gear ratio of a thrust actuator driven by motor and generate its large thrust without making small the number of the teeth of its input gears, by configuring each of its reduction gears through the gear train comprising the combination of gears whose number is not smaller than a specific one. SOLUTION: A reduction gear is configured by the combination of three or more gears. Providing a front-side sun gear 1f at the left end of a rotor 1b and a rear-side sun gear 1g at the right end of the rotor 1b, one-portions of front-side and rear-side reduction gears 2, 3 are configured respectively. The front-side and rear-side reduction gears 2, 3 comprise respective two front-side and rear-side planetary gears 2b, 3b provided respectively around the front-side and rear-side sun gears 1f, 1g, and respective two front-side and rear-side internal gears 2a, 3a provided respectively on the outsides of the gears 2b, 3b and in an actuator housing 7. The respective two front-side and rear-side planetary gears 2b, 3b are all fastened rotatably to front-side and rear-side planet carriers 2d, 3d by axes 2c, 3c. As a result, changing the numbers of the teeth of the internal gears 2a, 3a and sun gears 1f, 1g one by one on the front and rear sides, the large equivalent gear ratio of a thrust actuator driven by motor can be achieved.

Investigation of leakage within an external gear pump with new decompression slots: numerical and experimental study

Abstract: Gear pumps are amongst the most common types of positive displacement pumps. Having advantages such as small size, continuous and smooth output flow and high performance, these pumps are mainly used for handling high pressure fluids and flow metering. But the most important weakness of these pumps is the severe radial leakage at high pressures. Hence, it is important to study the leakage types and the methods of eliminating them in order to decrease any performance lost. In this study, a simple external gear pump has been studied numerically, analytically and experimentally. Using a commercial software, the pump leakage, volumetric efficiency and power consumption are studied numerically with respect to cavitation modeling. The numerical result shows good agreement with the experimental and analytical data. A new set of decompression slots on the gears teeth is introduced which eliminates the weakness of the prior methods. The results show that it has eliminated high pressure pulsations and catastrophic cavitation during the meshing process of the gears without increasing the radial leakage. As a result, the pump overall performance increases with smoother outflow. Also, the effect of gear teeth radius/teeth tip length on the pump performance has been studied in various working pressures within a case study. This investigation can be an essential and simple tool to design high performance gear pumps.

Continuously variable annular gear pump

Abstract: The pump has a stationary housing (1) and an annular ring set (5) with inner rotor (3) and meshing outer rotor (4). The gear ration of the inner rotor and the annular ring set is equal to 1. The bearing (12) of the outer rotor along its outer diameter (13) is inside the adjusting ring (14) of preferably the same width. The adjusting ring moves slip-free with its outer part circle (15) on an inner part circle (16). The difference between the diameters of the two part circles is double the eccentricity (17) of the ring set.

Constant mesh gear box landing gear

Abstract: A gear box trailer support having axially fixed gears in the gear box, including axially fixed larger and smaller input means on an input shaft, and axially fixed smaller and larger output gear elements of a gear cluster on the output cross shaft to the bevel gear drive for the elevating screw in the telescopic leg subassembly. The input gears are in constant engagement with their mating respective output gears. Shifting between high speed low torque output and low speed high torque output is achieved by axial movement of the input shaft within and relative to the hubs of the input gears. This input shaft has a male transverse drive pin which selectively engages cooperative transverse female sloped wall drive slots in the facing inner axial ends of the axially fixed input gears.

Gear pump or hydraulic gear motor with helical toothing provided with hydraulic system for axial thrust balance.

Abstract: Gear pump or hydraulic gear motor with helical toothing provided with hydraulic system for axial thrust balance. A gear pump (100) comprises a toothed driving wheel (1), a toothed driven wheel (2), a front flange (6) from which a projecting portion (13) of the shaft protrudes frontally, being connected to the shaft (10) of the driving wheel, a back lid (7) fixed to the case (3), and an intermediate flange (8) disposed between the case (3) and the front flange (6). The intermediate flange (8) comprises a first chamber (80) and a second chamber (81) connected by means of a connection duct (82) to the inlet or outlet fluid duct of the pump; a compensating ring (9) mounted in the first chamber (80) of the intermediate flange and inserted on a portion (T) of the shaft (10) of the driving wheel, in such manner to compensate the axial forces (A) of the driving wheel and transmit the motion on the shaft (10) of the driving wheel; and a piston (88) mounted in the second chamber (81) of the intermediate flange in order to stop against one end of said shaft (20) of the toothed driven wheel, in such manner to compensate the axial forces (B) imposed on the toothed driven wheel.