Electric Trimmer Blade Structure for Gear Shock Protection
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Solution Overview
Problem
In electrically driven trimming machines without a clutch mechanism, the shock or large torque from blade locking can directly damage the gear, whereas incorporating a clutch mechanism like in engine-driven machines increases weight and cost, and degrades operability.
Innovation Solution
A trimming machine with an electric motor, a blade drive gear, an eccentric cam, and a pair of blades where the eccentric cam reciprocates the blades, and a shock absorbing portion is provided between the connecting portion and the cutting edges to absorb and release the shock without damaging the gear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a clutch mechanism is adopted to release shock during blade locking, then gear damage is suppressed, but weight and cost increase and operability degrades
Solution Approach 1:
The patent extracts the shock absorption function from a complex clutch mechanism and implements it through a simple fragile portion directly formed on the blade. This removes the unnecessary clutch mechanism while retaining the essential shock release function, thereby reducing weight and cost while protecting the gear.
Solution Approach 2:
The patent uses a disposable fragile portion on the blade that is designed to break under excessive shock loads. This cheap, sacrificial element absorbs the shock by breaking, protecting the expensive gear from damage without requiring a complex reusable clutch mechanism.
2Reliability
If a clutch mechanism is adopted to release shock during blade locking, then gear damage is suppressed, but device complexity increases
Solution Approach 1:
The patent extracts the shock absorption function from a complex clutch mechanism and implements it through a simple fragile portion directly formed on the blade. This removes the unnecessary clutch mechanism while retaining the essential shock release function, thereby reducing device complexity while protecting the gear.
Solution Approach 2:
The patent uses a disposable fragile portion on the blade that is designed to break under excessive shock loads. This simple, sacrificial element provides shock protection without requiring a complex reusable clutch mechanism, significantly reducing device complexity.
3Reliability
If a clutch mechanism is adopted to release shock during blade locking, then gear damage is suppressed, but ease of operation worsens
Solution Approach 1:
The patent extracts the shock absorption function from a complex clutch mechanism and implements it through a simple fragile portion directly formed on the blade. This removes the unnecessary clutch mechanism that would degrade operability, thereby maintaining ease of operation while protecting the gear.
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 shock absorbing portion effectively suppresses gear damage during blade locking by absorbing or breaking under the shock, maintaining the machine's simplicity, weight, and cost without compromising operability.
Implementation Method 1
the shock absorbing portion may include a fragile portion
Implementation Method 2
a shock absorbing portion is provided between a connecting portion connected to the eccentric cam and the cutting edges in each of the blades
Data Source
AI summary
A trimming machine capable of suppressing damage to a gear when blades are locked, with a simple structure without increasing weight and cost. The trimming machine includes: an electric motor; a blade drive gear rotationally driven by the electric motor; an eccentric cam provided in the gear; and a pair of blades relatively slidably facing and contacting each other, in which the eccentric cam is adapted to reciprocate the pair of blades in relatively opposite directions along the longitudinal direction of the blades, thereby grinding cutting edges against each other, the cutting edges provided in a protruding manner with gaps therebetween in the pair of blades, and a shock absorbing portion is provided between a connecting portion connected to the eccentric cam and the cutting edges in each of the blades.