Author(s)

S. Nishida, H. Igawa, N. Hattori & Y. Korogi

Abstract

Generally speaking, lightweight design has been remarkably requested for various kinds of construction-machine parts from the view point of saving energy and cost reduction etc. In particular, the circular-digging bucket has enabled one to dig a circle in the ground by rotating the bucket. However, the increase in weight of an added rotation system becomes a considerable problem, that is, it causes imbalance between the front part and the rear part of the construction machine during operation. In this research, the authors tried to decrease the weight of the main bucket of the circular-digging medium-sized bucket as far as possible whilst keeping the reliability. The main results obtained in this analysis are as follows; (1) In the case of the main-bucket, it is desirable to attach the reinforcement rim and additional reinforcement in each part in the bucket. (2) The expected weight reduction ratio becomes 24.1% whilst keeping the rigidity of the main-bucket. (3) There is a part where it is difficult to suppress all of the stresses of these parts below an allowable stress. In actual use, it is necessary to regularly maintain successively about the stress concentration parts specified by this analysis. 1 Introduction The designers of various kinds of machine-parts have been continuously demanded to provide cost reduction and high performance year after year. The circular-digging bucket has enabled one to dig a circle in the ground by rotating the bucket. However, the increase in weight with a rotating system is considered

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