Front Loader Subframe Guide Mechanism for Rattle Reduction
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Solution Overview
Problem
Conventional front loaders mounted on vehicles experience rattling issues due to enlarged clearance between engaging portions of the mainframe and subframe, which compromises detachability and stability.
Innovation Solution
The design incorporates a subframe with a first and second engaging portion formed integrally in an attachment member, along with a guide portion featuring a convex and concave configuration, to precisely align and fix the subframe to the mainframe, reducing rattling while maintaining easy detachability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If clearance between engaging portions is enlarged to absorb dimensional variation, then ease of assembly is improved, but rattling occurs in the engaging portions
Solution Approach 1:
A guide portion is introduced as an intermediary element between the engaging portions. The guide portion includes a guide surface that guides the subframe during assembly, ensuring proper alignment before the engaging portions make contact. This mediator allows for larger clearance in the engaging portions for ease of assembly while preventing rattling through the guiding action.
Solution Approach 2:
The guide surface performs a preliminary action by guiding the subframe into proper alignment before the engaging portions engage. This preliminary alignment action occurs prior to the final engagement, allowing the engaging portions to have larger clearance without causing misalignment or rattling during operation.
2Reliability
If multiple engaging portions are provided for reliable mounting, then reliability of attachment is improved, but device complexity increases
Solution Approach 1:
The guide portion and engaging portions are merged into a single integrated structure on the subframe. The guide surface and engaging portions work together as a unified attachment mechanism, providing reliable mounting through multiple engagement points while avoiding the complexity of separate, independent components.
Solution Approach 2:
The attachment member on the subframe serves multiple functions: it provides the guide surface for alignment, contains the engaging portions for secure attachment, and integrates these functions into a single component. This multi-functionality reduces the number of separate parts needed while maintaining reliable attachment.
Data Source
AI summary
A front loader is attached to a car body and includes: a boom; a mainframe fixed to the car body; and a subframe that is detachably attached to the mainframe and supports the boom. The subframe includes: a first engaging portion that engages with the mainframe, and a second engaging portion that engages with the mainframe at a different position from the first engaging portion. Both the first engaging portion and the second engaging portion are formed in an attachment member that is integrally formed and that constitutes at least a portion of the subframe.