Drive Module Parking Brake Mode Gear Integration
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Solution Overview
Problem
Existing parking brake mechanisms for torque distribution drive systems are complex and difficult to integrate, requiring a simpler and more efficient locking mechanism for axle shafts.
Innovation Solution
A drive module with a housing, differential assembly, propulsion motor, torque-vectoring transmission, and mode gear that allows for the inhibition of axle shaft rotation by positioning the mode gear to couple the differential assembly to the housing, providing a straightforward and effective parking brake function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional parking brake mechanism is used to lock the axle shafts, then the parking brake function is achieved, but the device complexity increases and integration becomes difficult
Solution Approach 1:
The patent merges the parking brake function with the existing mode gear mechanism. The mode gear serves dual purposes: transmitting power during operation and locking the differential during parking. By combining these functions into a single integrated component, the device complexity is reduced while maintaining reliable parking brake functionality.
Solution Approach 2:
The mode gear is designed to perform multiple functions: power transmission during vehicle operation and parking brake locking when positioned in the second position. This multi-functionality eliminates the need for a separate dedicated parking brake mechanism, thereby reducing overall device complexity while ensuring reliable parking brake performance.
2Reliability
If a traditional parking brake mechanism is used to lock the axle shafts, then the parking brake function is achieved, but the integration into the torque distribution drive mechanism becomes difficult
Solution Approach 1:
The parking brake mechanism is merged with the existing mode gear assembly and differential case structure. The brake element is integrated into the differential case, and the mode gear's positioning mechanism serves dual purposes for both power transmission control and parking brake activation. This integration approach simplifies manufacturing and assembly processes.
3Reliability
If the mode gear is positioned in the second position to lock the differential, then the parking brake function is achieved, but the power transmission between the propulsion motor and differential assembly is inhibited
Solution Approach 1:
The mode gear is designed to be dynamically positionable between at least two positions: a first position for power transmission and a second position for parking brake locking. This dynamic repositioning capability allows the system to switch between power transmission and parking brake functions as needed, ensuring that power transmission is maintained during operation while enabling reliable locking when parked.
Data Source
AI summary
A drive module that includes a housing, first and second axle shafts, a differential assembly, a propulsion motor, a brake element fixed to the housing, a torque-vectoring transmission and a mode gear. The differential assembly is mounted in the housing for rotation about a rotational axis and has a differential case and a pair of output members. A first one of the output members is coupled to the first axle shaft for common rotation. The torque-vectoring transmission cooperates with the differential assembly to transmit rotary power to the second axle shaft. The mode gear is movable between a first position and a second position. Positioning of the mode gear in the first position permits transmission of rotary power between the propulsion motor and the differential assembly. Positioning of the mode gear in the second position couples the differential assembly to the housing to inhibit rotation of the first axle shaft.