Design method of hydraulic oil cylinder and hydraulic oil cylinder

Abstract

The invention discloses a design method of a hydraulic oil cylinder and a hydraulic oil cylinder. The design method comprises: determining the reliability R of the whole hydraulic oil cylinder; determining the allowable reliability Rn, strength storage coefficient n and reliability index [z] of each component of the hydraulic oil cylinder; calculating stress distribution parameters mur and sigmar or strength distribution parameters muS and sigmaS; based on the reliability index [z] and the strength storage coefficient n, according to a strength-stress interference model, calculating a stress average value muS or mur; and based on the average value muS or mur and according to the relationship between the average value muS or mur and the component size of the hydraulic oil cylinder, determining structural size corresponding to the component of the hydraulic oil cylinder. According to the design method and the hydraulic oil cylinder, provided by the invention, the selecting problem of safety coefficients is not considered, strength and stress randomness is considered, the strength-stress interference model is applied to determine the structural size, needing to be designed, of the hydraulic oil cylinder and calculate the reliability of the hydraulic oil cylinder, the hydraulic oil cylinder has the characteristics of being high in reliability and high in safety degree, cost can be saved, product quality can be improved, and the hydraulic oil cylinder has a safety effect meeting use requirements.

Description

technical field [0001] The invention relates to the technical field of construction machinery, in particular to a design method of a hydraulic oil cylinder and the hydraulic oil cylinder. Background technique [0002] At present, the conventional design of hydraulic cylinders is generally based on the design method of the worst condition analysis. Assuming that the minimum strength and maximum load occur at the same time, the ratio between the two is the safety factor. The selection of the safety factor is generally based on long-term practical experience. [0003] (1) Solve the cylinder wall thickness δ by the following cylinder strength calculation formula: [0004] δ = P t D 2 [ σ ] - - - ( 1 - 1 ...

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Problems solved by technology

[0031] (1) The safety factor is determined based on long-term practical experience, which is generally conservative and likely to cause waste of materials;

[0032] (2) The error caused by the uncertainty of various parameters such as the strength, pressure, and dimensional stability of the hydraulic cylinder is not considered;

[0033] (3) The calculated safety factor does not reflect the reliability of the hydraulic cylinder

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