Construction Machine Joint Mechanism for Dirt-Protected Power Transmission
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Solution Overview
Problem
Foreign matter such as dirt can adhere to the connection point between the bucket and the arm in construction machines, potentially causing malfunction of the power transmission mechanism.
Innovation Solution
A joint mechanism with a first member and a second member, featuring a power transmission mechanism guarded by alternating annular and arc-like walls, and stoppers that collide to remove adhering dirt, combined with a controller to manage power output for effective dirt removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power transmission mechanism is located at the connection point between two parts, then power transmission efficiency is improved, but foreign matter can easily enter and cause malfunction
Solution Approach 1:
The connection point structure is segmented into multiple protective regions using alternating first walls and second walls, creating a divided barrier system that prevents foreign matter from reaching the power transmission mechanism while maintaining power transmission functionality
Solution Approach 2:
The first walls and second walls act as intermediary protective barriers between the external environment and the power transmission mechanism, intercepting foreign matter before it can reach the sensitive components
2Object-affected harmful factors
If walls are added to guard the power transmission mechanism, then foreign matter protection is improved, but device complexity increases
Solution Approach 1:
The first walls and second walls are merged into an integrated alternating pattern structure that forms a unified protective barrier, reducing the need for separate protective components and simplifying the overall design
Solution Approach 2:
The alternating wall structure serves multiple functions simultaneously: it protects against foreign matter, maintains structural integrity, and allows for the integration of stoppers for dirt removal, reducing the need for additional specialized components
3Ease of repair
If stoppers are added for dirt removal, then ease of maintenance is improved, but device complexity increases
Solution Approach 1:
The stoppers enable the structure to self-clean by allowing controlled impact between the first and second members, which dislodges adhering dirt automatically without requiring external disassembly or manual intervention
Solution Approach 2:
The stopper mechanism allows adhering dirt to be discarded through impact-induced detachment, with the stoppers themselves remaining in place for repeated use, maintaining simplicity while enabling maintenance
4Ease of repair
If impact force is increased to remove dirt, then dirt removal effectiveness is improved, but power consumption increases
Solution Approach 1:
The stoppers are designed to provide just enough impact force to effectively remove adhering dirt, avoiding excessive force that would consume more power, by optimizing the stopper geometry and material properties
Solution Approach 2:
The impact parameters (force, duration, frequency) are optimized to achieve effective dirt removal at minimum power consumption by adjusting stopper design and activation conditions
Data Source
AI summary
A joint mechanism for a construction machine includes: a first member having a first facing surface; a second member rotatable around a rotation axis relative to the first member and having a second facing surface facing the first facing surface; a power transmission mechanism for transmitting power for rotation to the second member; a first wall protruding from the first facing surface and having an annular shape around the rotation axis; and a second wall protruding from the second facing surface and having an arc-like shape around the rotation axis. The power transmission mechanism is located on an inner side of the first wall in a radial direction around the rotation axis, and the second wall is located on an outer side of the first wall in the radial direction and overlaps at least partly with the first wall in a direction along the rotation axis.