Differential Module Sliding Sleeve for Four-Mode Torque Coupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing differential modules in vehicle transmission systems are complex and lack efficient mechanisms for selectively coupling and decoupling wheel drive shafts, leading to inefficiencies and mechanical losses.
Innovation Solution
A differential module with a sliding sleeve that can occupy four axial positions, allowing for selective coupling and decoupling of wheel drive shafts, including a connected, locked, disconnected, and parking mode, using dog clutches and friction clutches for efficient torque transmission and mode transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a sliding piece with three positions is used for coupling, then the device can selectively couple the input element to the output element, but the structure remains complex and lacks additional functionalities
Solution Approach 1:
The sliding sleeve is designed to perform multiple functions by occupying different axial positions. It can couple the second wheel drive shaft with the second planetary pinion (connected position), lock the differential (locked position), disconnect torque transmission (disconnected position), and engage parking (parking position). This multi-functional design increases adaptability without proportionally increasing structural complexity.
Solution Approach 2:
The coupling mechanism is segmented into distinct axial positions along the first axis of rotation. Each position (connected, locked, disconnected, parking) represents a discrete functional state, allowing the system to selectively engage different operational modes by moving the sliding sleeve to specific segmented locations along its axial path.
2Loss of energy
If the differential module continuously transmits torque to both wheel drive shafts, then the wheels remain driven, but mechanical losses occur when driving wheels are not required
Solution Approach 1:
The system dynamically adjusts torque transmission by allowing the sliding sleeve to move between connected and disconnected positions. When the second wheel drive shaft is not required for driving, the sleeve can be positioned to disconnect it from the second planetary pinion, eliminating mechanical losses. This dynamic reconfiguration enables the system to adapt to varying driving conditions and optimize energy efficiency.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a differential module (2) having a first axis of rotation (X1) and comprising: - a planet carrier (9); - a planetary pinion (11) pivotally mounted on the planet carrier (9); - a first and a second planetary pinion (12,13) pivoting about the first axis of rotation (X1); - a first and a second wheel drive shaft (3,4), the first wheel drive shaft (3) being rotationally linked to the first planetary pinion (12); and - a sliding sleeve (8) configured to selectively occupy four axial coupling positions of the differential module (2).