Working Machine Boom Lift Link Longitudinal Arrangement
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Solution Overview
Problem
Existing working machines face challenges in reducing turning radius and creating sufficient space around the operator seat while minimizing mechanical stress concentration and hydraulic hose volume, which affects operability and visibility.
Innovation Solution
The design includes a boom base portion with inner and outer side walls, a lift link supported by pivot shafts, a joint pipe with curved walls, and a hydraulic hose branching system that reduces the volume on the joint pipe, along with a contact portion placement that minimizes load on the restriction stopper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the interval between the booms is enlarged to create space around the operator seat, then the space around the operator seat is improved, but the turning radius of the working machine increases
Solution Approach 1:
The lift link is repositioned from a lateral arrangement to a longitudinal arrangement along the boom. By extending the lift link in the front-rear direction rather than the left-right direction, the patent creates space around the operator seat without increasing the lateral footprint that would enlarge the turning radius.
Solution Approach 2:
The lift link is designed with a curved shape that allows it to dynamically adapt its position. The curved configuration enables the lift link to move closer to the boom during operation while maintaining sufficient clearance around the operator seat, effectively managing the turning radius through dynamic spatial optimization.
2Device complexity
If the lift link is positioned laterally to simplify the support structure, then the structural complexity is reduced, but the turning radius increases and space around the operator seat is reduced
Solution Approach 1:
Instead of positioning the lift link laterally (left-right direction), the patent positions it longitudinally (front-rear direction) along the boom. This dimensional repositioning maintains structural simplicity while avoiding the turning radius and operator space issues caused by lateral placement.
Solution Approach 2:
The lift link is divided into multiple sections with different curvatures. The first section has a first curvature and the second section has a second curvature, allowing each segment to serve a specific function in optimizing both structural support and spatial clearance.
3Device complexity
If the hydraulic hose is routed along the joint pipe to connect boom front portions, then the hydraulic connection is simplified, but the hose volume increases and visibility is reduced
Solution Approach 1:
The hydraulic hose is extracted from the joint pipe area and routed through the interior space of the boom. By removing the hose from the external joint pipe routing, the patent reduces the visible hose volume and improves visibility while maintaining the simplified hydraulic connection through alternative routing paths.
4Ease of operation
If the contact portion is positioned to restrict the turning track of the operation tool, then the operational control is improved, but the load on the contact portion increases
Solution Approach 1:
Instead of positioning the contact portion on the outer surface of the attachment body facing outward, the patent positions it on the inner surface facing inward toward the boom. This inverted positioning allows the contact portion to restrict the turning track effectively while being supported by the boom structure, thereby reducing the load on the contact portion itself.
Data Source
AI summary
A working machine includes: a boom base portion including: an inner side wall; and an outer side wall disposed opposite to the inner side wall; a lift link disposed on a rear portion of the boom base portion; and a boom cylinder disposed in front of the lift link. One end side of the lift link is inserted between the inner side wall and the outer side wall and is pivotally supported on the boom base portion. The other end side of the lift link is pivotally supported on the machine body. One end of the boom cylinder is inserted between the inner side wall and the outer side wall in front of the lift link and is pivotally supported on the boom base portion. The other end of the boom cylinder is pivotally supported on the machine body by below the lift link.