Vibration and temperature variation of the cam ring of a hydraulic vane pump associated with vane tip detachment

Abstract A mathematical modeling approach to determine fluid film thickness on the vane tip in a vane pump transmission is developed. The transmission is based on a double-acting vane pump with an additional output shaft coupled to a floating ring. Owing to the floating ring design, the internal viscous friction helps to drive the output shaft, whereas the friction is turned into heat in a conventional vane pump. To study the mechanical efficiency, it is crucial to investigate the fluid film thickness between the vane tip and the ring inner surface. The modeling approach in this study takes the interactions between vane radial motion and chamber pressure dynamics into consideration, without using a computational fluid dynamics approach. The lubrication on the vane tip is considered as elasto-hydrodynamic lubrication and the fluid film thickness calculation is based on the Hooke lubrication diagram. Results show that the developed simulation model is capable of revealing the fluid film thickness change and vane radial motion in different operation regions. Sensitivity studies of several parameters on the minimum fluid film thickness are also presented.

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S1150305 Measurement of Temperature and Vibration of Cam-Ring of Hydraulic Vane Pump : Relationship with Vane Tip Detachment

The Proceedings of Mechanical Engineering Congress Japan ◽

10.1299/jsmemecj.2015._s1150305- ◽

2015 ◽

Vol 2015 (0) ◽

pp. _S1150305--_S1150305-

Author(s):

Toshiharu KAZAMA ◽

Kohki SASAKI ◽

Yukihito NARITA

Keyword(s):

Vane Pump ◽

Vane Tip

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Vane Pump Theory for Mechanical Efficiency

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1243/095440605x32002 ◽

2005 ◽

Vol 219 (11) ◽

pp. 1269-1278 ◽

Cited By ~ 12

Author(s):

Y Inaguma ◽

A Hibi

Keyword(s):

Friction Coefficient ◽

Theoretical Analysis ◽

Friction Force ◽

Mechanical Efficiency ◽

Friction Torque ◽

Design Concept ◽

Vane Pump ◽

Thickness Increase ◽

Upper Limit ◽

Vane Tip

This paper describes the theoretical analysis on the mechanical efficiency of a hydraulic-balanced vane pump and presents a design concept to decide values such as vane thickness and cam lift to improve its mechanical efficiency. In this paper, the friction torque characteristics of the balanced vane pump, especially the friction torque caused by the friction between a cam contour and vane tips are both experimentally and theoretically investigated. Although the friction force increases with vane thickness increase due to increase in the vane force, the mechanical efficiency of the vane pump does not decrease when the cam lift becomes large as the vane thickness is increased. An important parameter ∊ defined as the ratio to be obtained by dividing the cam lift by the vane thickness determines essentially the mechanical efficiency of the vane pump. The pumps with the same ∊ have the same mechanical efficiencies, even if the cam lift or the vane thickness varies. A larger value of ∊ leads the vane pump to obtain a higher mechanical efficiency although the limit of vane strength governs the upper limit for ∊. Additionally, reducing the friction coefficient of the vane tip contributes to improvement of the mechanical efficiency.

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A Study of the Effect of the Inertia Force of the Vanes on the Performance of the Hydraulic Vane Pump with Hypertrochoid Curve in the Inner Surface of its Stator

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.463-464.297 ◽

2012 ◽

Vol 463-464 ◽

pp. 297-300

Author(s):

M. Ebrahimi ◽

S.A. Jazayeri

Keyword(s):

Inertia Force ◽

Vane Pump ◽

Sliding Motion ◽

Radial Movement ◽

Inner Surface ◽

Vibration Noise ◽

Hydraulic Balance ◽

Vane Tip

Performance of a fixed displacement hydraulic balance vane pump, theoretically and practically was studied by application of the hypertrochoid curve in the inner surface of its stator. In addition to improving a sealing action between pressure and suction sides of the pump, one of the important characteristics of the hypertrochoid profile is improving of the inertial reaction of the vanes in each position where these vanes have a radial movement. Then it causes a smooth sliding motion of the vanes, and hence, a higher performance of the pump while attaining a longer life of it because of decreasing vane- tip and inner surface of stator wear and decreasing of vibration, noise and high stresses.

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Reduction of friction torque in vane pump by smoothing cam ring surface

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1243/0954406jmes225 ◽

2007 ◽

Vol 221 (5) ◽

pp. 527-534 ◽

Cited By ~ 13

Author(s):

Y Inaguma ◽

A Hibi

Keyword(s):

Surface Roughness ◽

Coefficient Of Friction ◽

Mechanical Efficiency ◽

Friction Torque ◽

Vane Pump ◽

Sliding Surfaces ◽

The Coefficient Of Friction ◽

Cylindrical Test ◽

Vane Tip

This work deals with the influence of surface roughness of cam contours on friction torque in a hydraulic balanced vane pump and it is verified that smoothing the surface of the cam contour can reduce friction torque. In the vane pump, the friction torque arising from the friction between a cam contour and vane tips is significant. In this article, first, the values of the coefficient of friction between the vane tip and its sliding surfaces were measured by using cylindrical test rings with various kinds of surface roughness. Then the torque characteristics of vane pumps having cam ring contours with various values of surface roughness were measured and their results compared with the results of an analysis of the coefficient of friction investigated using test rings. As a result, the friction torque caused by the friction between the cam contour and the vane tip was reduced by lessening the surface roughness of the cam contour, resulting in an improvement of the mechanical efficiency. The coefficient of friction measured by using the test rings could be applied to the actual vane pumps.

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