Chisel Double Limit Discs Eccentric Wear
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Solution Overview
Problem
Current chisels with handles in road maintenance machinery experience inefficient rotation, leading to eccentric wear, short service life, and low work efficiency due to insufficient rotation speed and regular component structure.
Innovation Solution
A chisel with double limit discs is designed, featuring a bit with a head and extension, where first and second limit discs are arranged between the holding seat and the bit, increasing contact area and reducing mutual pressure force, allowing for longer service life and easier replacement of wear parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single limit disc is used in the conventional chisel structure, then the structure is simple, but the contact area between the limit disc and holding seat is small, resulting in high mutual pressure force and rapid wear of the holding seat
Solution Approach 1:
The single limit disc is segmented into two limit discs (first limit disc and second limit disc) arranged in sequence between the bit and holding seat. This segmentation increases the total contact area with the holding seat, distributing the mutual pressure force across two surfaces and reducing wear on each individual contact point.
Solution Approach 2:
The two limit discs are arranged in a sequential dimension along the axial direction between the bit and holding seat. This dimensional arrangement allows both limit discs to contact the holding seat simultaneously, effectively increasing the contact area without significantly complicating the overall structure.
2Duration of action of stationary object
If the holding seat contact portion is made longer and thicker to increase service life, then the service life is prolonged, but the device complexity and material usage increase
Solution Approach 1:
The two limit discs serve as intermediary wear components positioned between the bit and the holding seat. They absorb the sliding friction and wear that would otherwise directly affect the holding seat, protecting the holding seat from rapid wear without requiring the holding seat itself to be made longer or thicker.
Solution Approach 2:
The limit discs are designed as replaceable wear components that can be easily replaced when worn. By making the limit discs the sacrificial elements rather than the holding seat, the system extends the service life of the expensive holding seat while using simpler, more economical limit discs that can be frequently replaced.
3Speed
If the chisel rotates at insufficient speed due to regular shape and component structure, then the structure is simple, but eccentric wear occurs and service life is reduced
Solution Approach 1:
The limit discs are designed with asymmetric features including concave and convex portions that create an irregular contact interface with the holding seat. This asymmetric design helps balance the rotational forces and reduce eccentric wear, enabling smoother rotation at higher speeds while maintaining reliable cutting performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The double limit disc design enhances the service life of both the chisel and holding seat by distributing wear and reducing sliding friction, maintaining optimal rotary cutting performance and reducing operational costs.
Implementation Method 1
the first limit disc or the second limit disc slides relative to each other, which also reduces the sliding friction force and sliding length of the holding seat and reduces the wear of the holding seat
Implementation Method 2
a part of the wear of the holding seat is replaced by the first limit disc or the second limit disc
Data Source
AI summary
Disclosed is a chisel with double limit discs. The chisel includes a holding seat and a bit mounted on the holding seat, the bit including a head and an extension provided on the lower side of the head, a first limit disc and a second limit disc arranged up and down are mounted between the holding seat and the head, the middle of the first limit disc having a first mounting through hole, and the middle of the second limit disc having a second mounting through hole, the second limit disc being partially concaved or partially convexed with the first limit disc. For the chisel, the service life of the holding seat and the bit are prolonged, the coaxiality between the chisel position and the holding seat position is maximized guaranteed, and the chisel may maintain the optimal rotary cutting performance during operation.