Disk Brake Pin Angle Optimization for Wear Adjustment
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Solution Overview
Problem
Existing disk brakes require a large number of activations to achieve a given degree of adjustment due to the limited transmission ratio, which affects braking torque and efficiency, especially with wear-dependent adjustments.
Innovation Solution
The longitudinal axis of the pin is positioned at an acute angle relative to the rotational axis of the brake application shaft, allowing the pin to move on a conical surface instead of a circular cylindrical surface, increasing the adjustment per activation and reducing the number of activations needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pin longitudinal axis is positioned parallel to the brake application shaft rotational axis (traditional configuration), then the structure is simple and compact, but the adjustment speed is low and many brake activations are required
Solution Approach 1:
The patent changes the angular parameter of the pin longitudinal axis relative to the brake application shaft rotational axis. By positioning the pin at an acute angle (specifically 15° to 23°) instead of parallel (0°), the transmission ratio is optimized to increase adjustment speed while maintaining structural compactness. This parameter change directly resolves the contradiction between productivity and device complexity.
2Manufacturing precision
If the offset of the pin longitudinal axis from the rotational axis is increased, then the adjustment magnitude per activation is larger, but the transmission ratio becomes less optimal
Solution Approach 1:
The patent optimizes the offset parameter by positioning the pin longitudinal axis at a specific acute angle (15° to 23°) to the rotational axis. This creates an optimal balance where the free end of the pin achieves sufficient distance from the rotational axis for precise adjustment, while the conical surface path maintains an optimal transmission ratio that reduces the number of activations required.
3Productivity
If the pin moves on a circular cylindrical surface (traditional path), then the transmission ratio is limited, but the mechanical path is simpler
Solution Approach 1:
The patent transitions the pin movement path from a circular cylindrical surface to a conical surface. This curvature change allows the free end of the pin to trace a conical path during rotation, which geometrically increases the adjustment magnitude per activation while maintaining smooth mechanical motion and optimal transmission characteristics.
Data Source
AI summary
The invention relates to a disk brake, in particular for utility vehicles, having a brake application shaft and having an adjusting device for wear-dependent adjustment, wherein a rotational axis of the brake application shaft is perpendicular to a rotational axis of the adjusting device and a pin serves to couple the brake application shaft to the adjusting device. A longitudinal axis of the pin encloses an acute angle with the rotational axis of the brake application shaft. The invention also relates to an adjusting device for a disk brake, in particular for utility vehicles, having an adjusting element in the form of an adjusting nut or an adjusting screw, and having a slipping clutch for limiting the torque which can be transmitted to the adjusting element. The slipping clutch has a friction element which is rotationally coupled to the adjusting element in both rotational directions.