Brake Slack Adjuster With Worm Gear for Reversible Shoe Setting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing brake pad adjustment devices, particularly those using sprocket mechanisms, are difficult to use due to the challenge of reaching and reversing adjustments, often leading to overtightening and mechanical issues like locking or breakage.
Innovation Solution
A brake pad adjustment device featuring a sleeve with a threaded shaft and worm gear mechanism, allowing for easy adjustment of brake shoe slack through a screwdriver-engageable worm gear, enabling both extension and retraction of the threaded shaft to adjust brake pad length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional sprocket mechanism with a star wheel is used to adjust brake slack, then the adjustment mechanism is compact and integrated, but the device becomes difficult to operate and prone to locking or breakage
Solution Approach 1:
The patent replaces the traditional star wheel and sprocket mechanism with a screw thread mechanism. The screw thread provides self-locking capability through its geometry, eliminating the need for complex gear mechanisms while improving reliability and ease of operation. The screw thread converts rotational motion to linear motion in a controlled manner, preventing overtightening and mechanical failure.
Solution Approach 2:
The patent introduces a worm gear as an intermediary between the adjustment mechanism and the brake shoes. The worm gear engages with the screw thread and provides controlled movement while preventing reverse motion, thereby eliminating the risk of overtightening and improving the overall reliability of the adjustment system.
2Ease of operation
If a star wheel mechanism is used for brake adjustment, then the device structure is compact, but the adjustment becomes difficult to reverse and control
Solution Approach 1:
The patent replaces the star wheel mechanism with a screw thread and worm gear system. The screw thread allows for precise, reversible adjustments through simple rotational motion, while the worm gear provides controlled engagement and disengagement. This substitution eliminates the complexity of multi-directional gear mechanisms while improving reversibility and control.
3Device complexity
If a traditional gear or star wheel adjuster is used, then the adjustment mechanism is integrated into the brake assembly, but the components are prone to locking, stripping, or breakage
Solution Approach 1:
The patent replaces gear and star wheel components with a screw thread mechanism. The screw thread geometry inherently provides self-locking capability through its angle of inclination, preventing unintended movement while eliminating the stress concentrations and weak points associated with gear teeth. This substitution significantly improves component durability while maintaining integration within the brake assembly.
Solution Approach 2:
The patent changes the mechanical parameters of the adjustment system by using a screw thread with specific pitch and diameter ratios. This parameter optimization allows the mechanism to withstand higher loads without stripping or breaking, while maintaining smooth operation and integration within the existing brake assembly structure.
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 provides a durable and easy-to-use mechanism for adjusting brake pad slack, eliminating the difficulties associated with traditional sprocket mechanisms by allowing precise control over brake pad tension without the risk of overtightening or mechanical failure.
Implementation Method 1
A threaded shaft rotatably engages the neck such that rotation of the threaded shaft extends and retracts the threaded shaft out of and into the neck
Implementation Method 2
A worm gear engages the threaded shaft wherein the threaded shaft is rotated by rotation of the worm gear
Data Source
AI summary
A brake slack adjustment device for adjusting the amount of slack in a pair of brake shoes includes a sleeve having a neck and a body extending from the neck. A threaded shaft rotatably engages the neck such that rotation of the threaded shaft extends and retracts the threaded shaft from the neck. A worm gear engages the threaded shaft. The threaded shaft is rotated by rotation of the worm gear. A head having a slot is coupled to the worm gear. The slot can engage a screwdriver to rotate the worm gear. A first slotted head is affixed to the body and is configured for engagement by a first brake shoe. A second slotted head is rotatably coupled to the threaded shaft. The second slotted head remains in an engagement orientation thereby engaging a second brake shoe while the threaded shaft rotates to extend or retract from the neck.