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TECHNICAL PAPERS

Geometry Assessment of Variable Displacement Vane Pumps

[+] Author and Article Information
Massimo Rundo

 The Fluid Power Research Laboratory, Politecnico di Torino, C.so Duca degli Abruzzi 24, Torino, 10129, Italymassimo.rundo@polito.it

Nicola Nervegna

 The Fluid Power Research Laboratory, Politecnico di Torino, C.so Duca degli Abruzzi 24, Torino, 10129, Italynicola.nervegna@polito.it

J. Dyn. Sys., Meas., Control 129(4), 446-455 (Oct 24, 2006) (10 pages) doi:10.1115/1.2718245 History: Received July 14, 2006; Revised October 24, 2006

The paper brings to evidence the effect that geometry of the stator ring of variable displacement radial pumps bears on performance characteristics of these units. The type of motion of the stator ring (linear or rotational), the location of the center of rotation, the porting plate integral with the casing or with the stator ring all have remarkable effects on the pump steady state and dynamic performance. At steady state, an influence exists on the attainable minimum displacement and on the deviation of discharge pressure from the desired setting when displacement is being controlled. In turn, dynamic performance is affected by changes in port plate timing as stator position and displacement undergo transitions. Specific attention is then committed to variable displacement vane pumps for internal combustion engines lubrication where an additional and foremost effect is investigated concerning the issues entailed by internal forces distribution on the stator ring that originate from incomplete chambers filling at high rotational pump speed.

Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Vane pump with absolute pressure limiter

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Figure 2

Variable displacement vane pump

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Figure 3

Geometric quantities (with O3 at suction side)

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Figure 4

Geometry with O3 at discharge side

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Figure 5

Pressure setting and pressure deviation (steady state characteristic)

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Figure 6

Mean pressure distribution inside the stator

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Figure 7

Angle ζ versus pump speed

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Figure 8

Solution with different values of τ

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Figure 9

Solution with τ>2

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Figure 10

Maximum stator rotation and minimum achievable eccentricity

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Figure 11

Eccentricity versus stator angular position

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Figure 12

Effective surface of influence

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Figure 13

Influence of position of center O3 on pressure setting

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Figure 14

Influence of position of center O3

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Figure 15

Influence of rotating port plate with l3=0

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Figure 16

Influence of incomplete filling

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Figure 17

Chamber at maximum volume with fixed port plate and discharge advance

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Figure 18

Angle γ versus α with O3 at suction side

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Figure 19

Angles αγmax and γmax

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Figure 20

Angle γ versus α with O3 at discharge side

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Figure 21

Rotating port plate and O3 at suction side

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Figure 22

Chamber at maximum volume with rotating port plate and discharge delay

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Figure 23

Angle α0 with rotating port plate

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Figure 24

Angles α0 and γmax versus l3∕emax

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Figure 25

Simulated steady state characteristic with τ=2

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Figure 26

Simulated characteristics with O3 suction side and rotating port plate

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Figure 27

Simulated characteristics with linear motion

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Figure 28

Characteristics for pump with linear motion

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Figure 29

Characteristics for pump with rotary motion

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Figure 30

Pump with piloted displacement control

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