Automatic Slack Adjuster Clutch Release Cam
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Solution Overview
Problem
Automatic slack adjusters in commercial vehicle brakes face reduced torque capacity due to toothed clutch wear, leading to premature service life, as the slipping of the toothed clutch results in blunting of teeth, which has not been adequately addressed by previous geometry changes.
Innovation Solution
The implementation of axially-oriented lugs and ramps on an external adaptor part allows for the disengagement of the one-way clutch teeth, enabling smooth rotation of the worm shaft without damaging the clutch teeth, and an alternative embodiment uses a camming action to achieve similar disengagement, allowing for manual adjustment without forced slippage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the toothed clutch is used for manual adjustment, then the adjustment function is achieved, but the clutch teeth wear and blunt leading to reduced torque capacity and premature service life
Solution Approach 1:
The invention extracts the harmful slipping action from the clutch engagement by introducing a cam mechanism that lifts the clutch follower from the clutch teeth during manual adjustment. This separates the adjustment function from the torque transmission function, allowing manual rotation without tooth wear while preserving the clutch's torque capacity during brake operation
Solution Approach 2:
The cam mechanism acts as an intermediary between the manual adjustment input and the clutch assembly. When the adjustment input is rotated, the cam converts this motion into axial movement that lifts the clutch follower away from the clutch teeth, enabling smooth rotation without engagement. This intermediary mechanism protects the clutch teeth from wear during adjustment operations
2Ease of operation
If the toothed clutch engages during manual adjustment, then rotation is controlled, but forced slippage occurs causing tooth blunting and damage
Solution Approach 1:
The invention applies preliminary anti-action by using the cam mechanism to preemptively lift the clutch follower from the clutch teeth before any slipping or forced engagement can occur during manual adjustment. This prevents the harmful interaction between the adjustment rotation and the clutch teeth, eliminating tooth blunting before it can happen
Solution Approach 2:
The invention introduces dynamic behavior to the clutch system by making the engagement state variable. The cam mechanism dynamically controls the axial position of the clutch follower, keeping it engaged during normal operation and disengaged during manual adjustment. This dynamic switching allows the system to adapt its behavior based on the operational mode, preventing wear during adjustment while maintaining torque capacity during braking
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 manual adjustment capabilities of automatic slack adjusters by preventing clutch tooth wear, thereby extending the service life and maintaining the torque capacity of the brake actuator mechanism.
Implementation Method 1
ramps are provided which, when the lugs are displaced circumferentially relative to one another, cause the adaptor part to push the worm shaft to move axially away from the adapter part
Implementation Method 2
The worm shaft is provided with a spring that maintains the worm shaft in its normal axial position
Data Source
AI summary
An improved self-adjusting automatic slack adjuster for reducing slack in the brake of a vehicle is provided, in which an easily accessible external operating feature permits the automatic slack adjuster's one-way clutch assembly to be readily disengaged to allow smooth release and retraction of the brake shoes of a vehicle brake without damage to the one-way teeth of the clutch assembly. When the external feature is operated in a brake release direction, the motion of the feature is translated into a motion which axially displaces an output part of the one-way clutch away from an input part of the clutch a distance sufficient to disengage the parts' one-way teeth, thereby disengaging the one-way clutch to permit brake shoe retraction without resistance from the one-way clutch.