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Hydraulic Power Generation
Published in Qin Zhang, Basics of Hydraulic Systems, 2019
As a continuous pumping device, a gear pump forms two separate chambers of suction and compression in between the meshed gear teeth, their adjacent teeth, and the pump housing. The volumetric displacement of a gear pump is calculated by the empty space between the gears and the pump housing. An approximate method to estimate gear pump displacement is to calculate the volume of a ring cylinder enclosed by the outside and inside diameters of the gear teeth (often called the diameters of the addendum and dedendum circles of the gear) and the gear face width using the following equation.
Interaction of Tooth Flanks in Parallel-Axes Involute Gearing
Published in Stephen P. Radzevich, Theory of Gearing, 2018
Parallel-axes gearings with a low tooth count (that is, LTC-gearings) are considered below in this section. An example of a helical gear with a low tooth count is illustrated in Figure 8.21. Gears of this particular type are extensively used in the design of gear pumps, as well as in other applications.
Hydraulics
Published in Don M. Pirro, Martin Webster, Ekkehard Daschner, Lubrication Fundamentals, 2017
Don M. Pirro, Martin Webster, Ekkehard Daschner
There are four types of gear pumps: external, internal, ring gear, and screw (Figure 7.4). Gear pumps are constant discharge types, and they generate flow carrying fluid from the inlet to the outlet between the tooth spaces of the gears. The fluid pumping chambers are formed between the gears, the housing, and the side plates. The hydraulic fluid serves to help seal close clearances as well lubricating the meshing gears. Small amounts of bearing wear could result in contact of the gears with the housings or side plates, thereby reducing the efficiency of the pump. Minimizing wear is critical to optimizing pump performance.
Trends in hydraulic actuators and components in legged and tough robots: a review
Published in Advanced Robotics, 2018
Koichi Suzumori, Ahmad Athif Faudzi
Hydraulic pumps convert mechanical energy, such as the rotations of motors or engines, to fluid energy. Hydraulic pumps such as piston pump, vane pump, gear pump, screw pump, and reciprocal pumps are among the types of pumps used in conventional hydraulics [40]. Recent development is mainly focused on piston, vane and gear pumps where these types of pumps are suitable for robotics and mobile hydraulics application. Small and compact pump using piezohydraulic structure was presented by Valdovinos et al. [134]. They demonstrate a proof-of-principle compact (centimeter size) piezo hydraulic pump that can produce useful mechanical work driven at frequencies in the kilohertz range compared with other piezohydraulic pumps. Tokyo Tech. and KYB Co. Ltd have developed a miniature piston pump [39] to be used in a new power pack as shown in Figure 11. The design is possible for both stationary and mobile hydraulic tough robots.
Development of CFD-based procedure for 3d gear pump analysis
Published in Engineering Applications of Computational Fluid Mechanics, 2020
Jernej Munih, Marko Hočevar, Klemen Petrič, Matevž Dular
Positive displacement (PD) pumps often feature two-dimensional shapes for simple design and reliable operation. In last years, a novel type of PD pumps emerged, among them Tumbling Multi-Chamber (TMC) pump with the three-dimensional shape of the gears, which can be seen in Figure 1. In comparison with currently established gear pumps, it offers the following advantages: self-adapting tightness of the pump parts during the wear process, the possibility to mold the parts from a polymer material, compact design and high volumetric efficiency for a reasonable cost. The advantages enable use in many applications, for which current PD pumps are less suitable.