Disc Brake Adjusting Spindle Thread Stop Against Over-Rotation
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Solution Overview
Problem
Disc brakes for motor vehicles face issues with the adjusting spindle rotating too far, leading to a loss of adjustment function due to inadequate contact coverage with other components, which can result in delayed braking and potential failure of the disc brake's adjustment mechanism.
Innovation Solution
A profiled notch, or thread turn, is created along the cylindrical wall of the adjusting spindle to limit its rotational movement, preventing it from falling out of the adjustment unit without adding extra components, and this limitation can be produced using the same material as the spindle or as a separate component, ensuring durability and ease of replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the adjusting spindle is allowed to rotate freely for adjustment, then the adjustment function is maintained, but the spindle may rotate too far and lose contact coverage with other components
Solution Approach 1:
A limitation element is introduced that preemptively prevents the adjusting spindle from rotating beyond the safe range. The limitation element engages with the thread turns of the adjusting spindle at a predetermined position, creating a mechanical stop that applies counter-action before the spindle can rotate too far and lose contact coverage with other components.
Solution Approach 2:
The limitation element serves as an intermediary component between the adjusting spindle and the adjustment unit. It mediates the rotational movement by providing a controlled engagement point that allows necessary adjustment while preventing excessive rotation, thus maintaining reliable contact coverage without restricting the adjustment function.
2Reliability
If additional components are added to limit rotational movement, then the spindle is prevented from rotating too far, but the device complexity increases
Solution Approach 1:
The limitation element is integrated with existing components of the adjustment unit, merging the rotational limitation function with the existing structural elements. Rather than adding a completely separate component, the limitation is implemented as part of the existing assembly, thereby preventing excessive rotation while minimizing the increase in device complexity.
Solution Approach 2:
The limitation element is designed to serve multiple functions: it limits rotational movement of the adjusting spindle, maintains proper contact coverage, and integrates with the existing adjustment unit structure. This multi-functionality reduces the need for additional dedicated components, thereby limiting the increase in device complexity while achieving reliable rotational control.
3Reliability
If the cylindrical outer contour of the adjusting spindle is increased to add limitation features, then rotational movement can be limited, but the overall size of the adjusting spindle increases
Solution Approach 1:
Instead of increasing the radial dimensions of the adjusting spindle's cylindrical outer contour, the limitation is implemented by utilizing the axial dimension through thread turns. The limitation element engages with these thread turns, allowing rotational movement limitation without expanding the spindle's radial profile, thereby maintaining compact dimensions while achieving reliable rotational control.
Data Source
AI summary
A disc brake includes a pressure piece, an adjusting spindle, and an adjustment unit. The adjusting spindle is guided through an opening, provided with a thread unit, of the pressure piece. The adjusting spindle is guided through the adjusting unit, and the adjusting unit protrudes into the opening. The adjusting spindle has a limitation disposed in a thread turn of the adjusting spindle.