Elastic Crawler Arc Cross-Section Prevents Sprocket Undercutting
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Solution Overview
Problem
Conventional elastic crawler drive mechanisms experience wear due to undercutting, where the core bar slips at the base of the sprocket teeth, leading to increased stress and load on the engaging surfaces, which reduces the durability of both the core bar and the sprocket.
Innovation Solution
The elastic crawler features engaging portions with a cross-sectional arc shape that ensures the trajectory of the outer edge during engagement and disengagement does not project further than the outer edge of the engaging surface, preventing undercutting and maintaining contact area without clearance, thus reducing stress on the core bar and sprocket teeth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a clearance is formed between the engaging surface of the core bar and the base of the sprocket teeth to prevent rubbing, then wear is reduced, but the stress on the engaging surface and tooth surface increases
Solution Approach 1:
The invention changes the geometric parameters of the core bar by providing a cross-sectional arc shape with specific radius of curvature. This parameter change allows the outer edge trajectory to match the sprocket tooth groove, preventing undercutting and rubbing while maintaining continuous contact without clearance, thus resolving the contradiction between preventing wear and reducing stress
Solution Approach 2:
The core bar is given a curved (arc) cross-sectional shape instead of a straight or angular shape. This curvature enables the outer edge to follow the circular trajectory of the sprocket tooth groove, ensuring smooth engagement and disengagement without rubbing against the tooth base, thereby preventing wear while maintaining continuous contact
2Force
If the core bar and sprocket teeth engage completely, then the load is distributed, but undercutting occurs causing rubbing and wear
Solution Approach 1:
By changing the cross-sectional shape parameter of the core bar to an arc shape with specific radius, the invention ensures that the outer edge trajectory during engagement matches the sprocket tooth groove trajectory. This prevents the core bar from slipping at the tooth base, eliminating undercutting and rubbing while maintaining complete engagement for load distribution
Solution Approach 2:
The invention converts the potentially harmful undercutting phenomenon into a beneficial smooth engagement process. By designing the core bar with an arc cross-section, the previously harmful rubbing motion is transformed into a controlled rolling motion that follows the tooth groove, eliminating wear while maintaining full engagement
Data Source
AI summary
In an elastic crawler (10) and an elastic crawler drive mechanism (100), at least a portion of the outer edge of an engaging portion (12) has a cross-sectional arc shape such that both the trajectory drawn by the outer edge of the engaging portion (12) from when the engaging portion (12) starts to enter a tooth groove of a sprocket (20) until engagement between the engaging portion (12) and teeth (22) is complete and the trajectory drawn by the outer edge of the engaging portion (12) from when the engaging portion (12) starts to disengage from the teeth (22) until disengagement is complete do not project further outward than the outer edge of the engaging portion (12) when the engagement is complete.