Rotation-Actuated Drum Brake for Radial Shoe Alignment
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Solution Overview
Problem
Conventional drum brake systems face challenges in self-alignment of inner and outer brake shoes, leading to misalignment and uneven wear due to pivotal movement, which affects the simultaneous engagement and contact area with the brake drum.
Innovation Solution
A rotation-actuated drum brake design where inner and outer brake shoes are actuated radially to contact the cylindrical brake drum, utilizing a rotating disc and actuator to ensure simultaneous engagement and reduce wear through orthogonal projection of roller guides and pivoting braking surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pivotal movement of brake shoes is used, then brake shoes can be actuated, but self-alignment becomes impossible and misalignment occurs
Solution Approach 1:
Instead of using pivotal movement to actuate the brake shoes, the patent inverts the approach by using a rotating disc with radially extending arms that push the brake shoes radially outward. This inversion eliminates the self-alignment problem caused by pivotal movement while maintaining effective brake shoe actuation.
Solution Approach 2:
The patent introduces a rotating disc with radially extending arms as an intermediary mechanism between the actuator and the brake shoes. This intermediary transfers the actuation force radially to the brake shoes, enabling precise alignment and simultaneous engagement without the misalignment issues associated with direct pivotal movement.
2Ease of operation
If pivotal movement is used for brake shoes, then actuation is achieved, but simultaneous engagement of inner and outer brake shoes becomes difficult
Solution Approach 1:
The patent inverts the actuation mechanism from pivotal movement to radial pushing motion. The rotating disc with radially extending arms pushes both inner and outer brake shoes simultaneously in the radial direction, ensuring synchronized engagement and eliminating the timing misalignment problems inherent in pivotal movement systems.
Solution Approach 2:
The patent combines the actuation of inner and outer brake shoes into a single integrated system. The rotating disc with radially extending arms acts on both brake shoe sets simultaneously through a unified radial pushing mechanism, ensuring they engage at the same time and improving reliability.
3Duration of action of stationary object
If misalignment occurs due to warping or wear, then brake operation continues, but contact surface area between brake shoes and drum is reduced
Solution Approach 1:
The brake shoes are designed with self-aligning features that automatically compensate for warping or wear. The radial actuation mechanism maintains constant contact between the brake shoes and drum surface, allowing the system to self-correct alignment issues and maintain optimal contact surface area throughout operation.
Solution Approach 2:
The patent employs adjustable parameters in the brake shoe design, including adjustable shaft positions and flexible mounting arrangements. These parameter changes allow the brake shoes to adapt to warping or wear conditions, maintaining full contact surface area and preventing the reduction that would otherwise occur during extended operation.
4Duration of action of stationary object
If misalignment reduces contact surface area, then brake operation continues, but uneven wear occurs on brake shoes and drum
Solution Approach 1:
The radial actuation system with self-aligning brake shoes automatically compensates for any misalignment caused by warping or wear. This self-service mechanism ensures uniform distribution of contact pressure across the entire contact surface, preventing uneven wear patterns and extending the service life of both brake shoes and drum.
Solution Approach 2:
By inverting from pivotal movement to radial pushing motion, the patent eliminates the root cause of uneven wear. The radial actuation applies force perpendicular to the drum surface across the entire contact area, ensuring uniform wear distribution and maintaining manufacturing precision throughout the brake's operational life.
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 solution ensures proper alignment and simultaneous engagement of inner and outer brake shoes, reducing wear on both brake shoes and the drum, maintaining optimal contact surface area and preventing undue wear.
Implementation Method 1
The roller guide and the shaft of the at least one inner brake shoe may project orthogonally with respect to one another. Similarly, the roller guide and the shaft of the at least one outer brake shoe may project orthogonally with respect to one another.
Implementation Method 2
the convex braking surface of the at least one inner brake shoe may pivot with respect to the shaft of the at least one inner brake shoe about a pivot axis parallel to the roller guide of the at least one inner brake shoe
Implementation Method 3
An actuator drives rotation of the rotating disc with respect to the annular brake housing
Implementation Method 4
selective driven rotation of the rotating disc drives the at least one inner brake shoe to contact an inner surface of the rotor sleeve with the convex braking surface, and simultaneously drives the at least one outer brake shoe to contact an outer surface of the rotor sleeve with the concave braking surface
Data Source
AI summary
The rotation-actuated drum brake uses both inner and outer sets of brake shoes, which are actuated in a radial manner, to contact the inner and outer surfaces of a cylindrical brake drum. The inner and outer sets of brake shoes are disposed within an annular brake housing and are constrained to move radially. An actuator selectively drives rotation of a rotating disc having a plurality of arcuate slots defined therein. This drives roller guides of the inner and outer sets of brake shoes to roll within respective ones of the arcuate slots. The driven rolling of the roller guides drives the radial motion of the inner and outer sets of brake shoes to simultaneously frictionally engage the inner and outer surfaces of the cylindrical brake drum.