Wheel Brake Automatic Adjusting Device Reversal Mechanism
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Solution Overview
Problem
Existing wheel brakes face issues with operational reliability due to tolerances and mutual inclinations between the adjusting lug and the adjustment wheel, leading to undesirable readjustment and back-rotating entrainment during reversing, which can result in malfunctions and overheating.
Innovation Solution
The wheel brake design incorporates an adjustment device on a ram with coordinated engagement length and stroke, featuring a pivoting cam and obliquely oriented adjusting lug, along with a support spring and return spring, to ensure reliable engagement and disengagement, and an emergency release mechanism for locking and unlocking the brake shoes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the adjustment lever and adjustment wheel are arranged on the application device, then the adjustment function is provided, but tolerances and mutual inclinations cause undesirable readjustment during reversing
Solution Approach 1:
The patent introduces an intermediary mechanism (the specific geometric arrangement of the adjusting lug and adjustment wheel with defined engagement length e and stroke h) that mediates between the adjustment lever and the brake shoes. This intermediary design compensates for tolerances and mutual inclinations by ensuring controlled engagement and disengagement during reversing, preventing undesirable readjustment while maintaining adjustment functionality.
2Reliability
If the adjusting lug and adjustment wheel are engaged, then adjustment function is achieved, but back-rotating entrainment occurs during reversing
Solution Approach 1:
The patent applies dynamics by designing the adjusting lug and adjustment wheel engagement to be dynamic rather than permanently fixed. The engagement length e and stroke h are specifically coordinated so that the adjusting lug engages the adjustment wheel during normal operation for precise adjustment, but automatically disengages during reversing motion. This dynamic engagement strategy prevents back-rotating entrainment while maintaining adjustment capability during forward operation.
3Stability of the object's composition
If the brake shoes are locked in rest position, then operational stability is improved, but emergency release becomes difficult in unfavorable conditions
Solution Approach 1:
The patent implements self-service through the automatic engagement and disengagement mechanism of the adjusting lug and adjustment wheel. During normal operation, the system automatically maintains stable engagement (providing operational stability). During reversing, the coordinated stroke h automatically causes disengagement, which can serve as an automatic emergency release mechanism without requiring manual intervention, thus resolving the contradiction between stability and ease of emergency release.
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 configuration enhances the operational reliability by preventing undesirable readjustment and back-rotating entrainment, ensuring secure engagement and easy release, thus improving the functional reliability and safety of the wheel brake, especially during reversing and in unfavorable operating conditions.
Implementation Method 1
The adjustment lever has a support spring and a separate return spring. The support spring holds the adjustment lever on a base and secures the specified relative position of the adjusting lug in relation to the adjustment wheel in all lever positions.
Implementation Method 2
The return spring moves the adjustment lever back to its original position when the brake is actuated or when reversing is completed, and holds it in this position.
Data Source
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AI summary
The invention relates to a wheel brake (2), comprising a brake application device (3), brake shoes (11, 12) and an automatic adjusting device (7) which has a pivotable adjusting lever (26) with an adjusting lug (34) and an adjusting wheel (21) that is in engagement therewith. The wheel brake (2) further comprises an automatic reverse mechanism (6) which reduces or prevents the braking action during reversing and comprises a pivot cam (15) and a tappet (20) that is connected to the adjusting wheel (21), wherein said tappet is mounted in an axially movable manner and is displaced during reversing. The engagement length (e) of the adjusting lug (34) on the adjusting wheel (21) is shorter than the stroke (h) of the tappet when travelling in reverse.