Grinder Brake Assembly With Radial Pressing Members for Heat Control
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Solution Overview
Problem
Power tools experience heat generation and reduced braking performance due to brake shoes contacting the rotating brake plate, leading to a decrease in component service life.
Innovation Solution
A power tool design featuring a brake assembly with a circular brake member fixed to the rotational shaft, where brake shoes apply a uniform force from radially outward positions, utilizing a brake assembly with brake arms and a wedge plate mechanism to manage braking and cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brake shoes contact the rotating brake plate to apply braking, then braking performance is achieved, but heat is generated and component service life is reduced
Solution Approach 1:
The brake assembly is segmented into multiple pressing members (at least two) that are distributed around the brake member, rather than using a single pressing member. This segmentation allows the braking force to be applied at multiple locations, distributing the heat generation across multiple contact points and preventing localized overheating, thereby maintaining braking performance while reducing thermal damage to components.
Solution Approach 2:
The pressing members are arranged radially around the brake member in a circular pattern, utilizing the radial dimension to distribute contact points. This dimensional arrangement ensures that braking force is applied uniformly across the brake member's circumference, optimizing heat dissipation while maintaining effective braking performance.
2Force
If brake shoes press the brake plate to apply braking, then braking force is generated, but dust accumulates on sliding surfaces reducing service life
Solution Approach 1:
Multiple pressing members distributed around the brake member create multiple sliding contact points, which prevents dust from accumulating at a single location. The segmented arrangement ensures that dust generated during braking is distributed across multiple surfaces and can be more effectively removed or managed, preventing the formation of harmful dust accumulations that would reduce component service life.
Solution Approach 2:
The radial arrangement of pressing members around the brake member creates a three-dimensional distribution of contact points. This dimensional configuration ensures that dust generated during braking is dispersed across multiple radial and circumferential positions, making it less likely to accumulate in specific areas and reducing the impact on component service life.
3Device complexity
If a single pressing member is used to apply braking, then the structure is simple, but heat is concentrated and braking performance degrades
Solution Approach 1:
The brake assembly uses multiple pressing members (at least two) arranged around the brake member, which increases structural complexity slightly but significantly improves braking performance. The segmented design distributes heat generation across multiple contact points, preventing localized overheating and maintaining reliable braking performance, thereby justifying the moderate increase in structural complexity.
Solution Approach 2:
The pressing members are arranged radially around the brake member, utilizing the radial dimension to distribute braking force and heat generation. This dimensional arrangement optimizes thermal management while maintaining effective braking performance, showing that the additional structural elements provide substantial functional benefits.
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
Reduces heat generation during braking, maintains braking performance, and prevents component degradation by effectively dissipating heat and preventing dust accumulation on sliding surfaces.
Implementation Method 1
the brake shoes are in contact with the surfaces of the rotating brake plate, generating more heat in the brake assembly
Data Source
AI summary
Heat generated during braking is reduced to prevent reduction in braking performance or the service life of the components. A grinder includes a housing, an operable member, a switch operable to be turned on or off in response to an operation on the operable member, a rotational shaft rotatable in response to an operation for turning on the switch, and a brake assembly that applies braking to the rotational shaft with the switch being in an off state and to release the braking applied to the rotational shaft in response to an operation for turning on the switch performed by the operable member. The brake assembly includes a brake member being circular and fixed to the rotational shaft, and multiple pressing members that press the brake member at multiple positions to apply a uniform force to the brake member from radially outward positions toward a center of the brake member.