Construction Machine Cab Pole Reinforcement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing reinforcement structures for construction machine cab pole members, such as those disclosed in Japanese Patent Laid-Open Publications TOKUKAI Nos. 2006-240568 and 2005-111557, uniformly extend along the longitudinal direction of pipes, leading to potential bending when the pole member hits a revolving frame under external force, necessitating a solution that enhances strength near the revolving frame without increasing material cost or weight.
Innovation Solution
The cab incorporates left and right rear pole members with internal spaces and specific cross-sectional shapes, featuring hole portions and plate-shaped members inserted into these holes to form a reinforcement structure. The plate-shaped members are positioned to extend along the longitudinal direction, near the main beam portion of the revolving frame, and additional hole portions are strategically placed near the center to improve strength and stiffness, minimizing deformation and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of pipe is increased to improve the strength, then the strength of the pole member is improved, but material cost and processing cost will increase
Solution Approach 1:
The patent applies local quality by inserting plate-shaped members only at specific locations (first hole portion near the revolving frame and second hole portion at the center) rather than uniformly thickening the entire pipe. This localized reinforcement provides necessary strength at critical areas while keeping material cost and processing cost lower than uniform thickening would require
2Ease of manufacture
If uniform reinforcement structure is used along the longitudinal direction, then the manufacturing is simplified, but the pole member may bend at the hit part when it hits the revolving frame
Solution Approach 1:
The patent implements local quality by placing reinforcement plates at two specific locations: the first hole portion near the revolving frame where external forces are most likely to occur, and the second hole portion at the center. This non-uniform distribution provides targeted strength where needed while maintaining manufacturing simplicity through standardized insertion processes
3Strength
If a reinforcement structure is added to the pole member, then the strength is improved, but the weight of the cab increases
Solution Approach 1:
The patent minimizes weight increase by applying reinforcement only where necessary - at the first hole portion near the revolving frame and at the second hole portion at the center - rather than reinforcing the entire pole member uniformly. This localized approach provides sufficient strength improvement while keeping the additional weight to a minimum
Data Source
AI summary
A cab includes left and right rear pole members having internal spaces and prescribed shapes in cross-section. The right rear pole member includes a first hole portion that extends along the longitudinal direction of the right rear pole member and penetrates the right rear pole member in the left-and-right direction of the right rear pole member, and a first plate-shaped member inserted into and secured in the first hole portion.