Elevator Drum Brake Shoe Misalignment Correction
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Solution Overview
Problem
Conventional elevator hoisting machine braking apparatuses face challenges in correcting center misalignment between the lining and brake drum, requiring space for the spherical seat mechanism which increases the overall size of the system.
Innovation Solution
The elevator direct-acting drum braking apparatus allows the brake shoe to be slidable relative to the movable core in a direction perpendicular to the brake drum, eliminating the need for space in the direction of pressing and enabling correction of center misalignment, thus reducing the overall size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a spherical seat mechanism is used to correct center misalignment between the lining and brake drum, then center misalignment correction is achieved, but space in the direction of pressing of the brake shoe is required, increasing overall size
Solution Approach 1:
The patent extracts and eliminates the spherical seat mechanism from the braking apparatus, replacing it with a direct pressing structure where the brake shoe presses directly against the brake drum without requiring additional space for alignment correction mechanisms
Solution Approach 2:
The brake shoe is designed to perform multiple functions: it provides braking force through direct pressing while simultaneously accommodating center misalignment through its pressing action itself, eliminating the need for separate alignment correction mechanisms
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 corrects center misalignment between the lining and brake drum, reducing the overall size of the braking apparatus while improving braking torque reliability and maintaining structural integrity.
Implementation Method 1
an elastic body that presses and holds the brake shoe against the movable core
Data Source
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AI summary
In an elevator direct-acting drum braking apparatus, a brake shoe is mounted to a movable core. A lining that is placed in contact with and separated from a brake drum is disposed on the brake shoe. The brake shoe is slidable relative to the movable core within a predetermined range in a direction that is perpendicular to a direction of contact with and separation from the brake drum and perpendicular to an axial direction of the brake drum. An elastic body that presses and holds the brake shoe against the movable core is disposed on the movable core.