Differential Brake Axle Assembly for Independent Parking Torque
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Solution Overview
Problem
Existing axle assemblies with differential brakes lack an efficient mechanism to independently apply brake torque to inhibit rotation of the differential assembly and drive pinion, especially when the primary brake actuator is inoperative, leading to potential vehicle movement during power source inactivity.
Innovation Solution
The axle assembly incorporates a differential brake system with a rotatable braking component and friction member that can engage with a friction surface to apply brake torque to both the connecting shaft and differential assembly, allowing for independent braking functionality, even when the primary brake actuator is off or inactive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a differential brake system is added to independently brake the differential assembly and drive pinion, then braking reliability and safety are improved when the primary brake actuator is inoperative, but device complexity increases
Solution Approach 1:
The differential brake assembly merges the braking function with the existing differential assembly structure. The friction members are positioned to engage with the differential assembly housing, and the brake actuator integrates with the power source actuator, combining multiple functions into a unified structure that reduces overall system complexity while maintaining independent braking capability.
Solution Approach 2:
The differential brake assembly serves multiple functions: it provides independent braking of the differential assembly and drive pinion, acts as a parking brake mechanism, and works in conjunction with the primary brake system. This multi-functionality allows a single addition to address multiple braking scenarios and improve overall system reliability.
2Ease of repair
If the differential brake is positioned outside the housing assembly, then ease of maintenance and access are improved, but device complexity increases
Solution Approach 1:
The brake system is segmented into two distinct locations: wheel brakes positioned at the wheel hubs inside the housing assembly, and the differential brake assembly positioned outside the housing assembly. This segmentation allows the differential brake to be accessed and maintained independently from the primary brake system, improving ease of repair while maintaining a coordinated braking function.
3Adaptability or versatility
If the differential brake uses a separate actuator independent of the power source, then braking functionality is maintained during power source inactivity, but device complexity and cost increase
Solution Approach 1:
The differential brake actuator is designed to be independently operable from the power source, allowing it to function autonomously when the power source is inactive. This self-service capability ensures that the differential brake can provide necessary braking function during power source inactivity without requiring additional complex control systems or communication infrastructure.
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 enables effective braking and parking brake functionality independent of the wheel brake actuator's power source, reducing energy consumption and preventing vehicle movement when the torque source is inactive, thus enhancing safety and efficiency.
Implementation Method 1
The differential brake may have a friction member. The friction member may be engageable with the friction surface to provide the brake torque.
Data Source
AI summary
An axle assembly having a differential assembly, a drive pinion, and a differential brake. The differential assembly may be rotatable about a differential axis. The drive pinion may mesh with a ring gear of the differential assembly. The differential brake may be operable to apply a brake torque to inhibit rotation of the differential assembly.