Elevator Disk Brake Automatic Clearance Adjustment
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Solution Overview
Problem
The existing disk brake systems for elevator traction machines face issues with uneven clearance distribution due to bending deflection of the main shaft under load, leading to brake disk inclination and potential safety hazards, as well as the need for on-site adjustments by professionals, which increases maintenance costs and reduces the brake's effectiveness.
Innovation Solution
The improved disk brake structure incorporates a fixed rod, levers, and spring clamps with a cambered boss, allowing for automatic adjustment of clearance between friction plates, eliminating the need for an adjusting screw and ensuring even clearance distribution, thus preventing chafing and noise, and allowing for self-adjustment without further maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the main shaft is subjected to load, then the bending deflection occurs causing brake disk inclination, but the clearance distribution becomes uneven leading to safety hazards
Solution Approach 1:
The brake caliper is designed to move dynamically along the guide rod, transforming from a fixed position to a movable position that automatically adapts to brake disk inclination. This dynamic adjustment ensures the brake friction plates maintain even clearance distribution with the brake disk even when the main shaft bends under load, resolving the contradiction between load bearing and reliability.
2Manufacturing precision
If the adjusting screw is used to set clearance, then the initial adjustment is possible, but on-site readjustment is required after shaft deflection causing maintenance issues
Solution Approach 1:
The brake caliper automatically adjusts its position along the guide rod in response to brake disk inclination, eliminating the need for manual on-site readjustment by professionals. The system self-regulates the clearance distribution through the movable caliper design, transforming a maintenance-intensive system into a self-maintaining system that preserves manufacturing precision without requiring complex repair interventions.
3Device complexity
If the brake caliper is fixed to the fixed disk, then the structure is simple, but the clearance cannot be automatically adjusted under shaft deflection
Solution Approach 1:
The brake caliper is redesigned from a fixed mounting to a movable structure that can slide along the guide rod. This dynamic design adds minimal structural complexity while providing significant adaptability - the caliper automatically repositions itself to maintain even clearance distribution with the brake disk even when shaft deflection occurs, resolving the trade-off between simplicity and adaptability.
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 enhances the safety and longevity of the braking system by maintaining even clearance distribution, reducing noise, and eliminating the need for on-site readjustments, thereby minimizing maintenance labor and ensuring consistent braking performance.
Implementation Method 1
the brake coil (4) is charged, so that a magnetic circuit is formed in the working clearance A between the moving disk (2) and the fixed disk (3) and electromagnetic force is created
Implementation Method 2
the brake spring (5) pushes the moving disk (2) so that the working clearance A is formed between the moving disk (2) and the fixed disk (3)
Implementation Method 3
the left and right friction plates (15, 16) at the inner side of the moving disk (2) and brake calipers (14) clamp the brake disk (1) to prevent the brake disk (1) from rotation
Data Source
AI summary
A disk brake comprising: a brake disk, a moving disk, a fixed disk, a mounting base, a guide rod, a fixed rod, first and second levers, a fixed plate, and first and second spring clamps. Here, one end of the fixed rod is fixed to a plane of the moving disk, the other end of the fixed rod passes through the fixed disk and is fixed to one end of the first/second lever, and the other end of the first/second lever is fixed to the circumferential surface of the fixed disk on the center line of the fixed disk; the fixed plate is fixed to either the guide rod or the mounting base; one end of the first/second spring clamp is connected to the fixed plate, and the other end of the first/second spring clamp is clamped at the middle position between the first and second levers.