Abstract
This paper focuses on the contaminated friction of fit clearance between the spool and valve body to explore the influence principles of clamping stagnation phenomenon. From the perspective of surface morphology and size of particulates in the clearance, designing and manufacturing the valve body, rough spool, conical spool, and standard morphology spool, the test bench was built up and the curves of real-time contaminated friction in the movement of spools were obtained through experiments. The curves show that the contaminated frictions have a feature of pulsation; meanwhile, the stagnation-sensitive size of particulates is between 0.7 and 0.9 times that of clearance. Compared to the ideal morphology spool within the range of sensitive size, the contaminated fiction of rough spool is increased, whereas the lower limit of stagnation-sensitive size range of particulates on conical spool is decreased. The contaminated friction is gradually increased on cis-conical spool but increased first and then decreased on invert cone spool.
Highlights
Hydraulic spool is one of the basic structural forms of hydraulic control valve
Themain mainstructure structuretype typeof ofthis thisexperimental experimental model model is surface characteristics of of general generalspool spoolwithin withinthe the surfaceroughness, roughness,cylindricity, cylindricity, and and other other morphology morphology characteristics machining tolerance range, the clearance size of experimental model is enlarged and the machining tolerance range, the clearance size of experimental model is enlarged (30 times) and the models of standard morphology spool, rough spool, conical spool, and valve body were designed and models of standard morphology spool, rough spool, conical spool, and valve body were designed manufactured
For the cis-conical spool, on the one hand, the smaller clearance outlet gives small size particulates greater opportunity to occur the tri-contact and generate friction, which lower limitlimit of stagnation-sensitive size range to the standard morphology which reduces reducesthethe lower of stagnation-sensitive sizecompared range compared to the standard spool
Summary
Hydraulic spool is one of the basic structural forms of hydraulic control valve. There is a circular clearance in micron level between spool and body, which plays a part in guiding and lubricating the spool movement. The size of solid particulates and morphology of fit clearance are the main factors of stagnation in spool valve. Factors thought to influence stagnation have been explored, and the optimal size and profile error of fit clearance that provides a reference for stagnation of hydraulic valve caused by machining quality has been obtained (Wang 2005) [1]. Surveys such as that conducted by Wang Anlin et al [2] have shown a robust designing method to solve stagnation of spool caused by viscous heating.
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