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Research Papers: Gas Turbines: Structures and Dynamics

Experimental Study of the Shaft Motion in the Journal Bearing of a Gear Pump

[+] Author and Article Information
R. Castilla, P. J. Gamez-Montero, E. Codina

LABSON, Department of Fluid Mechanics, U.P.C., Colom, 7-11, Terrassa E-08222, Spain

M. Gutes

 ArvinMeritor GmbH, Albert Einstein Str., 14-20, Dietzenbach D-63128, Germany

J. Eng. Gas Turbines Power 131(5), 052502 (May 26, 2009) (9 pages) doi:10.1115/1.3078202 History: Received July 15, 2008; Revised October 23, 2008; Published May 26, 2009

The movement of the shaft of a driven gear in a gear pump is experimentally studied. Three different methods are considered, and the use of a laser micrometer measurement method is validated. In order to use the laser micrometer, some modifications are made to the gear pump. Experimental results for different working pressures and rotational velocities are shown. For a low nondimensional working pressure, defined in a similar way as the Sommerfeld load, experimental and numerical results agree very well for relative eccentricity. Nevertheless, experimental results made clear that the role of the lateral plate of the pump is very important for high nondimensional working pressure. A value of 100 is given for the critical nondimensional working pressure in order to avoid wear and slant in the lateral plate. Frequency analysis of the outlet pressure, as well as the precise measurement of the wear in the pump case, support experimental observation of the inability of the journal to retain the shaft for high nondimensional pressure.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 3

Pump with two driver shafts and two front covers. The driven sticks in the lateral plate come out the front cover through two preformed holes. The bar stick driven in the front cover is also shown.

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Figure 4

Test rig with the rotating disk, the two transmitter-receiving pairs, and the test pump

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Figure 5

Segments in the Keyence Sensor

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Figure 6

Eccentricity of relative motion of the shaft as a function of pressure, for different angular velocities

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Figure 7

Equilibrium angle of relative motion of the shaft as a function of pressure for different angular velocities

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Figure 8

Polar graph with position of the journal for constant angular velocity and operating pressure variables. Load mean direction is indicated with a dashed line.

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Figure 10

Equilibrium angle of relative motion of the shaft as a function of rotational velocity for different pressures

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Figure 11

Polar graph with position of journal for different pressure. Load mean direction is indicated with a dashed line.

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Figure 17

Spectrum of the relative x movement of the shaft for an experiment at 100 bars and 1608 rpm. The main peak is in the rotational frequency around 27 Hz.

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Figure 18

Scheme of lateral plate with sticks

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Figure 19

Calculated load on the driving gear (left) and the driven gear (right). Fp and Fp′ are the loads due to the pressure distribution, considering that suction is located below. The total load is the sum of the load due to pressure and contact force.

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Figure 16

Spectrum of the x movement obtained from numerical simulations (see Appendix ) for an experiment with conditions of 150 bars and 1500 rpm. The first main peak is at 300 Hz, the gearing frequency. The rotation frequency is not visible.

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Figure 15

Spectrum of the pressure outlet for 100 bars of working pressure and 1500 rpm. The first peak is related to the gearing frequency.

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Figure 14

Attitude angle versus nondimensional pressure for numerical simulation and presented experiments

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Figure 13

Relative eccentricity versus nondimensional pressure for numerical simulation and presented experiments

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Figure 12

Variation in slant of lateral plate with working pressure

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Figure 9

Eccentricity of the shaft in the bearing as a function of rotational velocity for different pressures

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Figure 2

Lateral plate with the two 3 mm bar sticks driven in

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Figure 1

Parts of the gear pump used in the experimental study

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