Research Papers

Improving the Volumetric Efficiency of the Axial Piston Pump

[+] Author and Article Information
Shu Wang

Eaton Corporation, 14615 Lone Oak Road, Eden Prairie, MN 55344

J. Mech. Des 134(11), 111001 (Oct 02, 2012) (7 pages) doi:10.1115/1.4007361 History: Received September 30, 2010; Revised July 06, 2012; Published October 02, 2012; Online October 02, 2012

The volumetric efficiency is one of the most important aspects of system performance in the design of axial piston pumps. From the standpoint of engineering practices, the geometric complexities of the valve plate (VP) and its multiple interactions with pump dynamics pose difficult obstacles for optimization of the design. This research uses the significant concept of pressure carryover to develop the mathematical relationship between the geometry of the valve plate and the volumetric efficiency of the piston pump. For the first time, the resulting expression presents the theoretical considerations of the fluid operating conditions, the efficiency of axial piston pumps, and the valve plate designs. New terminology, such as discrepancy of pressure carryover (DPC) and carryover cross-porting (CoCp), is introduced to explain the fundamental principles. The important results derived from this study can provide clear recommendations for the definition of the geometries required to achieve an efficient design, especially for the valve plate timings. The theoretical results are validated by simulations and experiments conducted by testing multiple valve plates under various operating conditions.

Copyright © 2012 by American Society of Mechanical Engineers
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Figure 1

The axial piston pump

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Figure 2

Timing and pressure distribution of the valve plate

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Figure 3

Control volume of the piston bore

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Figure 4

Pressure profile of VP-I

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Figure 5

Pressure profile of VP-II

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Figure 6

Pressure profile of VP-III

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Figure 7

Pressure profile of VP-IV

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Figure 8

Pressure profile of VP-V

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Figure 9

Tendency curves of the DPC and the volumetric efficiency

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Figure 10

Tendency curves of the DPC and the volumetric efficiency (2200 rpm, 140 bars)

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Figure 11

Tendency curves of the DPC and the volumetric efficiency (1200 rpm, 140 bars)

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Figure 12

Tendency curves of the DPC and the volumetric efficiency (1200 rpm, 240 bars)



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