Power Tool Half-Split Housing Vibration and Heat Reduction
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Solution Overview
Problem
Multifunction power tools experience microvibration issues during high-speed swing movements, leading to operability and workability problems, heat generation, and potential vibration welding issues due to mismatched phases and rubbing of mating surfaces in half-split housing structures.
Innovation Solution
The implementation of a relative displacement restriction mechanism, such as press-fitting protrusions, ribs, or elastic members, between the half-split housings to prevent separation and restrict relative displacement along the mating surfaces, ensuring the housings remain connected and reducing vibration and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If screw connection is used to mate half-split housings, then assembly is simple and disassembly is easy, but separation resistance is insufficient and mating surfaces vibrate mutually causing heat generation
Solution Approach 1:
The connection mechanism is segmented into multiple independent elements: screw connections for easy assembly/disassembly, and protrusion-recess structures for continuous separation resistance. This segmentation allows each element to fulfill its specific function without compromising the other.
Solution Approach 2:
The protrusions are pre-formed on the housing surfaces before assembly. When the housings are mated, these protrusions automatically engage with corresponding recesses to establish separation resistance before any vibration occurs, preventing mutual vibration of mating surfaces.
2Ease of repair
If screw connection is loosened for maintenance, then access to internal components is easy, but housings separate completely causing misalignment
Solution Approach 1:
The protrusion-recess structures act as a cushioning mechanism that prevents complete separation. When screws are loosened, the housings can be partially separated for component access, but the protrusions maintain a baseline connection that preserves alignment and prevents damage.
3Ease of manufacture
If half-split housing structure is used, then manufacturing and assembly are simplified, but mating surfaces rub against each other during vibration causing heat generation
Solution Approach 1:
The protrusion-recess structures are integrated directly into the housing molding process. This merging of the separation resistance mechanism with the housing structure itself maintains manufacturing simplicity while effectively preventing mating surface rubbing and heat generation.
4Reliability
If additional restraint mechanisms are added to prevent housing separation, then separation resistance increases, but device complexity increases
Solution Approach 1:
The protrusion-recess structures serve multiple functions simultaneously: providing separation resistance, maintaining alignment during screw loosening, and preventing complete housing separation. This multi-functionality increases reliability without adding separate dedicated components.
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 solution effectively restricts relative displacement and vibration between the half-split housings, preventing heat generation and maintaining the connection even when screw connections are loosened, thereby enhancing the stability and performance of multifunction power tools.
Implementation Method 1
the relative displacement restriction means is configured by the screw-boss part being press-fitted to the boss-receiving part
Implementation Method 2
the relative displacement restriction means includes an elastic member
Implementation Method 3
the microvibration caused by the high-speed swing movement can cause mating surfaces of the left and right half-split housings to vibrate at different phases (vibrate mutually) and/or to rub with each other. As a result, a heat generation problem may occur
Data Source
AI summary
Several means 71, 72, 73, 74, and 75 are provided for restricting a relative displacement in a separating direction of half-split housings 50L, 50R. At one or more of several screw-connection parts 60 of the left and right half-split housings 50L, 50R, a press-fitting protrusion 71a is provided in an insertion hole 62a of a boss-receiving part 62 into which a screw-boss part 61 is inserted. By press-fitting the screw-boss part 61 to the boss-receiving part 62, a separation resistance may be introduced between the left and right half-split housings 50L, 50R.