Drilling Tool Auxiliary Member Asymmetric Force Distribution
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Solution Overview
Problem
Existing drilling tools experience abrasion of auxiliary members due to concentrated pressing forces during long-term excavation, leading to instability and loss of the locked state between the fixing member and locking portion.
Innovation Solution
The drilling tool design features a recessed groove on the fitting shaft portion and a pin hole in the tool main body, with the auxiliary member positioned to receive and distribute the pressing force orthogonally, reducing the pressure on the auxiliary member and preventing abrasion by maintaining a stable locked state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the auxiliary member is positioned to receive pressing force in the axial direction, then the locked state is maintained, but the auxiliary member undergoes abrasion due to concentrated pressing force
Solution Approach 1:
The patent positions the auxiliary member asymmetrically relative to the striking force direction. The straight line connecting the center of the recess and the pin hole center line intersects the axis at an angle, causing the auxiliary member to receive pressing force components in both axial and radial directions rather than purely axially, thereby distributing the concentrated pressing force and reducing abrasion
Solution Approach 2:
The patent introduces a radial dimension to the force distribution by positioning the auxiliary member such that it receives pressing force components in both axial and radial directions. This dimensional change in force vector distribution prevents concentration of force in a single direction, reducing abrasion while maintaining locking reliability
2Reliability
If the fixing member is retained by the auxiliary member pressing it, then the locked state is maintained, but the pressing force concentrates on one point causing accelerated abrasion
Solution Approach 1:
The asymmetric positioning of the auxiliary member relative to the striking force direction creates a force distribution where the pressing force acts at an angle rather than perpendicular to the auxiliary member surface. This angular distribution spreads the contact area and reduces concentrated pressing force, extending the service life of the auxiliary member while maintaining locking reliability
Solution Approach 2:
The patent changes the directional parameters of the pressing force by positioning the auxiliary member at an angle to the axial direction. This parameter change in force vector orientation transforms the concentrated axial pressing force into a distributed force with both axial and radial components, reducing wear and extending component life
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
This configuration effectively prevents abrasion of the auxiliary member, ensuring a stable locked state and prolonged tool performance during long-term excavation tasks, enhancing the reliability of the drilling process.
Implementation Method 1
the auxiliary member positioned to receive and distribute the pressing force orthogonally, reducing the pressure on the auxiliary member
Data Source
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AI summary
A drilling tool has a tool main body including a fitting hole portion and a striking force being applied to a tip side in an axial, and a fitting member including a fitting shaft portion, wherein the fitting shaft portion has a recessed groove, a locking pin is inserted into a pin hole provided in the tool main body, and is locked by the recessed groove, a fixing member for retaining the locking pin is fitted to an opening portion of the pin hole, a locking portion for locking the fixing member in a pin hole center line direction is provided in the opening portion, a recess is provided on an outer peripheral surface of the tool main body adjacent to the opening portion of the pin hole, the recess has an auxiliary member having a side surface capable of coming into contact with a side surface facing the recess of the fixing member and maintaining a locked state between the fixing member and the locking portion, and when viewed in a center line direction of the pin hole, a straight line connecting a center of the recess and a pin hole center line to each other extends in a direction intersecting an axis of the tool main body.