Disc Brake Adjusting Spindle Thread Limitation Against Over-Rotation
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Solution Overview
Problem
Disc brake adjusting spindles can become misaligned due to wear, leading to increased lever travel and delayed braking, and may fall out of adjustment units, resulting in a sudden loss of adjustment function.
Innovation Solution
A thread limitation is implemented on the adjusting spindle to restrict rotational movement, preventing it from falling out of the adjustment unit, using the same material composition as the spindle to minimize premature fatigue and allowing for fine adjustment without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the adjusting spindle is allowed to rotate freely to adjust brake pad clearance, then the adjustment function is maintained, but the spindle may rotate too far and fall out of the adjustment unit, causing loss of adjustment function
Solution Approach 1:
A limiting feature is provided on the adjusting spindle that prevents it from rotating more than a predetermined amount. This preliminary constraint stops the spindle before it can fall out of the adjustment unit, thereby preventing the loss of adjustment function while still allowing normal adjustment operations to proceed
2Reliability
If a limiting feature is added to the adjusting spindle to prevent over-rotation, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The limiting feature is integrated directly into the adjusting spindle as part of its structure, rather than being a separate component. This merging of functions maintains reliability improvement while minimizing the increase in device complexity, as the limiter becomes an inherent part of the spindle assembly
3Ease of manufacture
If the limiting feature is made from the same material as the adjusting spindle, then manufacturing is simplified, but the limiter may experience premature material fatigue
Solution Approach 1:
The limiting feature is designed with localized structural characteristics that differ from the main spindle body, such as modified geometry or stress distribution features. This allows the same material to be used throughout (simplifying manufacturing) while the local structural design compensates for potential fatigue issues by distributing stresses more effectively
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 thread limitation effectively prevents the adjusting spindle from unscrewing further, maintaining the adjustment function and ensuring proper brake operation by limiting rotational movement without additional components, thus enhancing brake performance and longevity.
Implementation Method 1
a threaded ring (5) located in the adjusting spindle (10), in combination with a disc spring (21a), secures the adjusting spindle (10) against unintentional adjustment or return movements
Data Source
Figure 1~2
Figure 3~3a
Figure 4~5
AI summary
The invention relates to a disk brake having an adjusting spindle (10), in particular the invention relates to a disk brake for motor vehicles, having an adjusting spindle (10) and an adjustment unit (20), wherein the adjusting spindle (10) has a boundary (12).