Polymer Battery Module Bearing to Prevent Tool Housing Fusing
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Solution Overview
Problem
In accumulator-driven electric tools with oscillating movements, the accumulator module fuses to the power tool due to heat generated by friction, leading to non-destructive removal issues and material damage.
Innovation Solution
A bearing device with a polymer-based bearing element is used to support the accumulator module, maintaining a distance between the power tool housing and accumulator module, preventing direct contact and heat buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the accumulator module is directly supported on the power tool housing, then the connection is stable and simple, but friction heat causes plastic fusing between the housing and accumulator module
Solution Approach 1:
A bearing element made of polymer material is introduced as an intermediary component between the power tool housing and the accumulator module. This bearing element serves as a mediator that prevents direct contact between the plastic housing and accumulator module, thereby eliminating the friction heat that causes plastic fusing while maintaining stable connection through the bearing element's geometric constraints.
2Ease of operation
If wax is applied to the contact surfaces to prevent fusing, then the accumulator module can be removed easily, but the wax evaporates and the protective effect is short-lived
Solution Approach 1:
The patent replaces the temporary protective measure of wax with a permanent structural solution. The bearing element is designed as a durable polymer component that provides continuous protection against fusing throughout the product's service life, eliminating the need for evaporating wax coatings and ensuring long-lasting prevention of plastic fusing.
3Reliability
If metal clamps are used to create a stable friction surface, then the connection is more stable, but the plastic pushbutton latch becomes damaged over time due to vibration
Solution Approach 1:
The bearing element is designed with specific geometric features including a bearing surface and a retention protrusion that locally concentrate the connection function. The bearing surface provides stable friction contact while the retention protrusion engages with the latch mechanism, distributing forces appropriately to prevent damage to the plastic latch while maintaining connection stability.
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
Prevents undesirable plastic fusing by reducing friction and heat, allowing easy removal of the accumulator module without damage.
Implementation Method 1
the accumulator module may fuse to the power tool at the contact points, due to the heat generated by friction
Data Source
AI summary
A bearing device for supporting an accumulator module on an interface of a power tool housing section of a handheld tool and a corresponding accumulator housing section of the accumulator module, including at least one bearing element, which is designed to captively support the accumulator module in a connection position, in which the accumulator module is electrically connected to the handheld tool, and to permit the transfer of the accumulator module from the connection position into a removal position, in which the accumulator module may be removed from the handheld tool. The at least one bearing element includes a polymer and is arranged between the power tool housing section and the accumulator housing section in the connection position for the purpose of supporting the power tool housing section and the accumulator housing section.