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Hydraulic Power Generation
Published in Qin Zhang, Basics of Hydraulic Systems, 2019
Another popular design of axial-piston pumps is the bent-axis pump. This type of pump consists of a rotating drive plate, a rotating cylinder block, a universal link, and a stationary valve plate (Figure 2.9). A notable structural feature of a typical bent-type axial-piston pump is that the axis of its cylinder block is set at an offset angle, often called the bent angle, relative to the axis of the drive plate. Rotation of the drive plate and the piston block is synchronized using the universal link connecting the drive shaft and the block shaft. As a result, all pistons will rotate with the drive plate to convert the rotating motion of the drive plate into the reciprocal motions of the pistons.
The Power of Pressure and Flow
Published in Wayne Anderson, Controlling Electrohydraulic Systems, 2020
The axial piston pump is shown in Figure 2.4. The pistons are also in a rotor but are positioned axially. The input shaft is connected directly to the rotor. In order to obtain varying strokes like the radial piston pump, the axial piston pump uses a swash plate positioned at an angle from the axis of the piston surfaces. The swash plate does not rotate, but it can be changed in position relative to its pivot. As the rotor (and therefore pistons) moves counterclockwise (as shown in the piston cross section), the bottom piston draws in oil as it strokes outward. The end plate (similar to the pintle) separates the inlet and outlet flow by the kidney-shaped ports.
Creation and Control of Fluid Flow
Published in John S. Cundiff, Michael F. Kocher, Fluid Power Circuits and Controls, 2019
John S. Cundiff, Michael F. Kocher
The axial piston pump has a series of cylinders (typically 7 or 9) mounted parallel to the axis of rotation. (The arrangement is similar to cartridge chambers in a revolver cylinder.) Pistons are installed in the cylinders. Each piston has a spherical end that mounts in a shoe (Figure 4.20).
Dynamic Modeling of Floating Valve Plate Motion in an Axial Piston Pump
Published in Tribology Transactions, 2018
David Richardson, Farshid Sadeghi, Richard G. Rateick, Scott Rowan
The basic components that comprise an axial piston pump are a swash plate, pistons, piston shoes, an auxiliary cam, a cylinder block, and a valve plate. The cylinder block is driven by an external motor, which causes the pistons inside the cylinder block to move up and down as they slide along the swash plate. The reciprocal motion of the pistons generates the flow in and out of an axial piston pump. All of the flow into the pump passes through the valve plate located above the cylinder block as indicated in Fig. 1. The pressures at the interface between the cylinder block and valve plate can lead to wear of the valve plate by cavitation. If the valve plate fails, it can lead to complete failure of the axial piston pump. Therefore, it is critical to understand how the valve plate interacts with the cylinder block to decrease and/or eliminate the wear of the valve plate.
Study on the characteristics of oil film load capacity for axial piston pump
Published in Australian Journal of Mechanical Engineering, 2020
Zhaoqiang Wang, Shan Hu, Hong Ji, Zhen Wang, Wei Liang
Swash-plate axial piston pump is an important component of hydraulic system and widely used in construction machinery (Koc, Ng and Hooke 1997; Bae, Chung and Jang 2015; Yamaguchi, Sekine and Shimizu 1990). The valve plate pair of a swash-plate axial piston pump is composed of the kidney-shaped slot of the valve plate, sealing clearance, and cylinder block. Its structural parameters affects the service life of axial piston pump. The interface between the cylinder block and valve plate represents one of the most critical design elements in the rotating kit of an axial piston pump (Wang 2014; Ohno and Azuma 2015). The plunger of the axial piston pump moves back and forth in the plunger hole; the sealing volume varies with the axial piston pump’s reciprocating motion and realised the process of oil absorption and drainage (Kazama 2017; Bae et al. 2015). One of the kinematic pairs affecting the efficiency of an axial piston pump is the valve plate-cylinder block system (Zoto and Nagórka 2007). A cylinder block within a high-speed pump is more likely to tilt away from the valve plate, which results in a wedge-shaped oil film between the valve plate and the cylinder block (Chao, Zhang and Xu 2017; Cho, Zhang and Manring 2002; Ivantysynova and Baker 2009). The tilting inertia moment on the cylinder block produced by the inertia forces of the piston/valve plate assemblies should be considered when analysing the cylinder block balance (Zhang, Chao and Xu 2018; Seo, GarcãA-Mayoral and Mani 2015). The tribological mechanism between the valve plate and the cylinder block in oil hydraulic axial piston pumps plays an important role in high-power density (Kim and Jung 2003; Kim, Kim and Lee 2005).