Electric Work Machine Circuit Board Mounting for Thermal Deformation Control
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Solution Overview
Problem
The deformation of a circuit board due to heat generated in electronic components leads to decreased heat dissipation performance and increased temperature in electric work machines.
Innovation Solution
Incorporating a motor, a circuit board, a case, at least one elastic member, and a filler to absorb the expanding force of the filler, thereby suppressing the deformation of the circuit board and maintaining thermal coupling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If filler is used to fix the circuit board inside the case, then the circuit board is securely fixed, but the filler expands when heated causing deformation of the circuit board
Solution Approach 1:
An elastic member is introduced as an intermediary between the filler and the circuit board. The elastic member deforms when the filler expands due to heat, absorbing the expansion force and preventing direct transmission to the circuit board, thus resolving the contradiction between secure fixing and shape maintenance
Solution Approach 2:
The elastic member changes its physical parameters (deforms) in response to temperature-induced filler expansion. This parameter change allows the elastic member to adapt to thermal conditions and protect the circuit board from deformation while maintaining fixing stability
2Temperature
If the circuit board is tightly fixed to maximize heat dissipation contact, then heat dissipation performance is improved, but the circuit board deforms under thermal stress
Solution Approach 1:
The elastic member serves as a mediator between the heat generating element and the circuit board, allowing thermal contact for heat dissipation while absorbing mechanical stress from filler expansion, thus maintaining both heat dissipation performance and circuit board shape
3Stability of the object's composition
If the circuit board is rigidly mounted to prevent movement, then positioning accuracy is improved, but thermal expansion of filler causes deformation
Solution Approach 1:
The elastic member acts as a flexible element between the rigid case and the circuit board. It provides positioning stability while accommodating thermal expansion through its flexibility, preventing circuit board deformation caused by rigid mounting
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 solution effectively suppresses circuit board deformation and maintains heat dissipation performance, preventing further temperature increases in the electric work machine.
Implementation Method 1
even when the filler is highly heated and expands by the heat generated in the heat generating element
Implementation Method 2
the elastic member placed inside the case deforms earlier than the circuit board, absorbing an expanding force of the filler
Implementation Method 3
The case includes a heat dissipation part thermally coupled to the heat generating element
Data Source
AI summary
An electric work machine includes a motor, a circuit board, a case, at least one elastic member, and a filler. The circuit board includes a heat generating element mounted thereon, and the heat generating element generates heat due to the motor being driven. The case includes a heat dissipation part thermally coupled to the heat generating element and houses the circuit board therein. The at least one elastic member is placed between the circuit board and the case, and is housed inside the case. The filler is filled inside the case and fixes the circuit board and the at least one elastic member inside the case.