Abstract
Currently, in most cases, the study of the operability of hydraulic cylinders in terms of their bearing capacity is carried out by means of assessing the longitudinal stability of a compressed rod with the variable cross section. In this case, the inclination of the rod in space is not taken into account. However, during operation, as a rule, a hydraulic cylinder inclined in space due to longitudinal-transverse loading is deformed in the vertical longitudinal plane with the appearance of a full-scale deflection. So, the limit value of the longitudinal compressive force is less than the limit compressive force of a stable rod, which implies that a rod having an initial curvature is more susceptible to bending, appearance of residual deformations in its elements and has less reliability than a straight, vertically arranged one. As the guide elements of the hydraulic cylinder wear out, its total deformation increases, which leads to an increase in longitudinal-transverse loads. With regard to long-stroke hydraulic cylinders, a special danger is their immediate stop in space when the working equipment of the machine meets an insurmountable obstacle. The purpose of the study is a scientifically based description of the areas of functioning of the hydraulic cylinder in the conditions of longitudinal-transverse bending or stability, as well as the boundaries separating them
Highlights
Multilink equipment of modern hydroficated road and construction machines (RCM) is driven by double-acting hydraulic cylinders with a one-sided rod, the operation of which is accompanied by their complex plane-parallel movement in space
In the case with RCM cylinders, especially long-stroke ones, all the three cases take place, as a result of which calculation is possible only according to the deformed scheme, that is, with full account for the total deflection of the hydraulic cylinder
In [2], the limit value of the longitudinal compressive force PSE for the hydraulic cylinder and its allowable value are calculated by Euler formula
Summary
Multilink equipment of modern hydroficated road and construction machines (RCM) is driven by double-acting hydraulic cylinders with a one-sided rod, the operation of which is accompanied by their complex plane-parallel movement in space. During operation, as a rule, a hydraulic cylinder inclined in space due to longitudinal-transverse loading is deformed in the vertical longitudinal plane with the appearance of a complete deflection. In this case, the limit value of the longitudinal compressive force is less than the limit compressive force of a stable rod, which implies that a rod having an initial curvature is more susceptible to bending and the appearance of residual, plastic deformations in the sections of its elements and has less reliability than a straight, vertically arranged one. As the friction surfaces of the elements of the hydraulic cylinder wear out, which again leads to an increase in its total deformation and, respectively, to an increase in the acting longitudinal-transverse loads, the operating conditions of the hydraulic cylinder deteriorate with greater intensity, as a result of which its reliability and service life are reduced both in terms of its bearing and sealing abilities
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