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Technical Briefs

Load and Stress Analysis for the Swash Plate of an Axial Piston Pump/Motor

[+] Author and Article Information
M. Z. Norhirni

norhirni@gmail.com Centre of Advanced Manufacturing and Material Processing, University of Malaya, 50603 Kuala Lumpur, Malaysia

M. Hamdi, L. H. Saw, N. A. Mardi, N. Hilman

 Centre of Advanced Manufacturing and Material Processing, University of Malaya, 50603 Kuala Lumpur, Malaysia; Department of Engineering Design and Manufacturing,  Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia

S. Nurmaya Musa

Department of Engineering Design and Manufacturing,  Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia; Department of Management and Engineering,  Linköping University, SE-581 83 Linköping, Sweden

J. Dyn. Sys., Meas., Control 133(6), 064505 (Nov 22, 2011) (10 pages) doi:10.1115/1.4004578 History: Received April 16, 2010; Revised March 24, 2011; Published November 22, 2011; Online November 22, 2011

In an axial piston pump design, the swash plate plays an important role in controlling the displacement of the pump, especially in a closed loop system. In this paper, the axial piston pump is incorporated into the design of a hydraulic regenerative braking system for hybrid vehicles. The pump in this configuration should function in dual mode, as a pump and as a motor. For this to occur, the swash plate should swing in two opposite directions. The swash plate presented in this paper is designed for stability and ease of control. Analytical analysis of torque and forces were conducted using MATLAB software to verify the motion of the swash plate. Furthermore, finite element analysis was also carried out to evaluate the rigidity and stress in the system. The analytical evaluation has shown that as the swash plate angle increases, the required control force and torque increase almost linearly. However, the change of the plate angle was found to have no effect on the force exerted on the X-axis and the torque exerted on the Z-axis.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

(a) System during braking and (b) system during acceleration

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Figure 2

Swash plate concepts

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Figure 3

Third angle projection of swash plate design (a) hemisphere shaped body (b) ellipse open-end

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Figure 4

Free-body diagram of the swash plate

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Figure 5

Average force exerted on the swash plate in X-axis and Z-axis directions with respect to swash plate angle change

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Figure 6

Comparison of the average torque exerted on the swash plate verses drive shaft speed and (Pd-Pi) at α = 0.35 rad (20 deg)

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Figure 7

The average torque exerted on the swash plate in X-axis, Y-axis, and Z-axis direction with respect to swash plate angle change

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Figure 8

Hydraulic schematic

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Figure 9

Simulation of pump mode

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Figure 10

Stroke of displacement control member versus time, (max. stroke is 0.125 m) in pump mode

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Figure 11

Simulation of motor mode

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Figure 12

Stroke of displacement control member versus time, (max. stroke is 0.125 m) in motor mode

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Figure 13

Pressure compensator and hydraulic axial piston pump

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Figure 14

Swash plate position and swash plate angle at hydraulic axial piston unit operating as pump

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Figure 15

Swash plate position and swash plate angle at hydraulic axial piston unit operating as motor

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Figure 16

Flow chart for swash plate system integrated with pressure compensator

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Figure 17

Analysis result for the stress distribution on swash plate

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