Working Machine Blade Unit With Rotatable Sleeve to Reduce Wear
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Solution Overview
Problem
The holding unit in working machines wears due to rubbing against the first blade during reciprocation, leading to premature wear.
Innovation Solution
Incorporating an outer sleeve with a cylindrical shape that is rotatable around a holding part, allowing it to rotate instead of rubbing directly against the blades, thus reducing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the holding unit directly holds the first blade and second blade without a rotatable outer sleeve, then the structure is simple, but the holding unit wears quickly due to rubbing against the first blade during reciprocation
Solution Approach 1:
The patent introduces an outer sleeve as an intermediary component between the holding part and the first blade. The outer sleeve is rotatable around the holding part, allowing it to rotate instead of rubbing directly against the first blade during reciprocation. This mediator reduces wear on the holding unit by converting sliding friction into rotational motion, thereby resolving the contradiction between wear resistance and structural simplicity.
Solution Approach 2:
The patent makes the outer sleeve rotatable around the holding part, transforming a static structure into a dynamic one. During reciprocation of the first blade, the outer sleeve rotates in response, allowing the holding unit to adapt to the reciprocating motion. This dynamic characteristic reduces wear by preventing direct rubbing contact, thus improving reliability while maintaining reasonable structural complexity.
2Reliability
If the holding unit is designed to prevent wear through direct contact reinforcement, then wear resistance improves, but the reciprocating motion and friction cause overheating and energy loss
Solution Approach 1:
The outer sleeve acts as a mediator that reduces friction between the holding part and the first blade. By allowing the outer sleeve to rotate, the design converts high-friction sliding contact into lower-friction rotational motion, thereby reducing energy loss while extending the service life of the holding unit.
Solution Approach 2:
The patent converts the harmful reciprocating rubbing motion into beneficial rotational motion of the outer sleeve. The reciprocation that originally caused wear and energy loss now drives the rotation of the outer sleeve, which reduces friction and heat generation, thereby transforming a harmful effect into a beneficial one.
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 rotatable outer sleeve design significantly reduces wear on the holding unit by minimizing direct contact and friction, extending its lifespan.
Implementation Method 1
the outer sleeve rotates around the holding part in response to the reciprocation of the first blade. This suppresses wear of the outer sleeve caused by it rubbing against the first blade
Data Source
AI summary
A working machine may include: a first blade; a second blade overlapping with the first blade in an up-down direction; and a holding unit configured to hold the first blade and the second blade overlapping each other in the up-down direction. The first blade may be configured to reciprocate in a direction perpendicular to the up-down direction with respect to the second blade. The first blade may include a first elongated hole having a longitudinal direction along the reciprocating direction. The second blade may include a second elongated hole having a longitudinal direction along the reciprocating direction. The holding unit may include: a holding part inserted in the first elongated hole of the first blade and the second elongated hole of the second blade; and an outer sleeve having a cylindrical shape and supported by the holding part such that the outer sleeve is rotatable around the holding part.