Differential Interlock Cable Linkage for Park-Mode Traction Lock
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Solution Overview
Problem
Existing vehicles with differential gear assemblies face issues of getting stuck when one drive wheel loses traction, as the differential gear assembly distributes most or all of the drive torque to the wheel with lost traction, preventing the vehicle from moving along the desired path until both wheels regain traction.
Innovation Solution
A reaction cable differential interlock system that includes a differential lock lever, shift lever, mode select lever, linkage mechanism, and a single cable, allowing the operator to simultaneously lock the rear differential assembly when placing the shift lever in the park mode, thereby ensuring both wheels are locked or unlocked based on the vehicle's traction conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a differential gear assembly is used to permit wheels to rotate at different speeds during turns, then the vehicle can handle turns better on paved surfaces, but the vehicle gets stuck when one drive wheel loses traction
Solution Approach 1:
The differential lock mechanism provides dynamic adaptability by allowing the operator to switch between unlocked mode (for turns on paved surfaces) and locked mode (for traction situations). The system transitions between two operational states based on driving conditions, resolving the contradiction between needing speed differentiation for turns and needing equal torque distribution for traction reliability
2Reliability
If a parking mechanism is added to lock the transmission output shaft, then the vehicle can be secured in park mode, but the system complexity increases
Solution Approach 1:
The patent combines the parking mechanism and differential lock mechanism into a single integrated system controlled by one cable. When the shift lever is placed in park, the same cable simultaneously engages both the parking lock and the differential lock, eliminating the need for separate control mechanisms and reducing overall system complexity despite adding parking security functionality
3Ease of operation
If a single cable is used to control both the linkage mechanism and differential lock lever, then the ease of operation is improved, but the cable must transmit multiple motions simultaneously
Solution Approach 1:
The single cable serves multiple functions: it controls the shift lever positioning, engages the parking mechanism, and simultaneously actuates the differential lock lever. This multi-functional cable design simplifies the operator interface while the linkage mechanism internally manages the complexity of coordinating these multiple functions through mechanical advantage and motion transmission
Data Source
AI summary
A reaction cable differential interlock system can include a differential lock lever, a shift lever, a mode select lever, a linkage mechanism, and a single cable. The differential lock lever can be configured to be movably mounted on a differential gear assembly and connected to a differential lock collar of the differential gear assembly. The shift lever can be movable between a plurality of transmission mode positions and the mode select lever can be movable between a plurality of differential mode positions. The linkage mechanism can be coupled to the shift lever and the mode select lever, and the single cable can extend from the linkage mechanism to the differential lock lever.