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Thumb Design and Optimization for Backhoe Loader

John Deere C&F-Kurtis Langner
John Deere India Pvt. Ltd.-Sandeep Dhotre, Surya Pratap Ponnana, Amit Ghate
Published 2019-10-11 by SAE International in United States
Product Engineering organizations are committed to provide solutions with the right quality and value to customers. Value improvement and efficient product improvement are key considerations for product engineering.In this paper, the Author summaries thumb design and optimization for backhoe loader. The project goal was to create an in-house thumb design. The backhoe thumb attachment was previously a proprietary design of a supplier. The supplier’s design had two major limitations, limited opportunity of design improvements for resolving customer issues and higher total cost. This paper covers details about overcoming these limitations.Multiple variants of backhoe loaders use four different thumbs. Small and mid- range backhoe machine classes use 4-tine and 2-tine thumb depending upon customer applications. The design team targeted an external customer requirement of a more compact design and internal requirement of accelerating design improvement cycle time and reducing cost. To overcome these concerns, along with few more constraints, a full study of a new thumb design was conducted. Key constraints included compatibility to current design, maintain tip forces, and optimize for a compact design. Verification…
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