Self-Adjusting Load Brake for Hoist Friction Wear Compensation
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Solution Overview
Problem
Rescue hoists face challenges in maintaining effective load control and braking mechanisms, particularly due to wear and tear on friction surfaces, which can lead to reduced performance and safety under varying load conditions.
Innovation Solution
A self-adjusting automatic load brake mechanism is introduced, featuring a ball ramp assembly and pressure plates that translate axially in response to wear surface thinning, ensuring consistent braking force and accommodating wear without compromising locking functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If friction surfaces are used for braking, then braking force is generated, but wear on friction surfaces reduces braking effectiveness over time
Solution Approach 1:
The brake assembly incorporates wear compensating elements including a movable brake shoe that translates axially to maintain consistent friction surface engagement. The ball ramp assembly converts radial wear into axial movement, dynamically adjusting the brake shoe position to compensate for friction surface thinning and maintain reliable braking throughout the service life
Solution Approach 2:
The mechanism changes the positional parameter of the brake shoe axially in response to friction surface wear. As the friction surfaces thin, the brake shoe automatically translates to maintain the same effective braking distance, thereby preserving braking effectiveness throughout the component's service life
2Reliability
If fixed braking mechanism is used, then simple structure is achieved, but wear cannot be compensated leading to performance degradation
Solution Approach 1:
The brake assembly is self-adjusting through automatic wear compensation. The ball ramp assembly and movable brake shoe work together to automatically translate the brake shoe axially as friction surfaces wear, eliminating the need for external adjustment mechanisms while maintaining consistent braking performance
Solution Approach 2:
The mechanism incorporates inherent feedback through the ball ramp assembly that detects friction surface wear and automatically triggers axial translation of the brake shoe. This closed-loop adjustment ensures consistent braking performance without requiring external control systems
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 self-adjusting mechanism maintains effective braking performance by compensating for wear on friction surfaces, ensuring reliable load control and safety across different load conditions, enhancing the operational stability and longevity of the hoist.
Implementation Method 1
the first shaft can be coupled to a ball ramp assembly configured to translate the first shaft in the axial direction in response to thinning of the first wear surface and the second wear surface
Implementation Method 2
A brake assembly for a hoist can include a plurality of friction discs configured to engage one another to provide a braking force
Implementation Method 3
a first pressure plate is operably coupled to a first bias element configured to apply an axial load to the first reaction plate, the second reaction plate and the plurality of friction discs via the first pressure plate
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A self-adjusting automatic load brake for a hoist is disclosed. In various embodiments, the load brake includes a first shaft (276) defining an annular hollow portion; a second shaft (324) defining an engagement portion, the engagement portion configured for sliding disposition within the annular hollow portion; a first reaction plate (320) coupled to the first shaft; a second reaction plate (309) coupled to the second shaft; and a plurality of friction discs (306), with at least one of the plurality of friction discs coupled to a cup (312) and disposed between the first reaction plate and the second reaction plate, the annular hollow portion of the first shaft and the engagement portion of the second shaft being sized and configured to accommodate thinning of the plurality of friction discs.