Axle Differential Parking Lock With Single-Drive Actuation
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Solution Overview
Problem
Existing securing devices for electric vehicles require significant fitting space and incur high production costs due to redundant operation of transmission and differential blocking drives, and they do not efficiently manage axle differential equalization and parking lock functions.
Innovation Solution
A device for a vehicle drivetrain with an axle differential that integrates a differential blocking device and a parking lock, actuated by a single drive unit, allowing coordinated operation to save space and reduce costs, enabling efficient equalization and parking lock management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a securing device uses two separate drive units for transmission blocking and differential blocking, then redundant operation and reliability are improved, but fitting space and production costs increase
Solution Approach 1:
The patent combines two separate drive units (transmission blocking drive and differential blocking drive) into a single integrated drive unit that can control both the transmission blocking means and differential blocking means. This merging reduces the fitting space required while maintaining the redundant operation capability through coordinated control of both blocking functions by one drive unit.
Solution Approach 2:
The single drive unit is designed to perform multiple functions: it can independently control the transmission blocking means to block the transmission output shaft, independently control the differential blocking means to block the differential case, or operate both simultaneously. This multi-functionality eliminates the need for separate dedicated drive units for each blocking function.
2Reliability
If a securing device uses two separate drive units for transmission blocking and differential blocking, then redundant operation is achieved, but production costs increase
Solution Approach 1:
By merging two separate drive units into one integrated drive unit with a single motor, the patent reduces the number of components that need to be manufactured, assembled, and tested. This consolidation lowers production costs while maintaining the redundant operation capability through the coordinated control of both blocking functions.
3Adaptability or versatility
If the differential blocking device and parking lock are actuated independently, then functional independence is maintained, but device complexity and space requirements increase
Solution Approach 1:
The single drive unit is designed with a multi-position output mechanism that can selectively engage different blocking means. The drive unit can position its output to block the transmission output shaft (transmission blocking), block the differential case (differential blocking), or both simultaneously, or neither. This universal actuation mechanism maintains functional independence of each blocking function while reducing overall system complexity by eliminating the need for separate drive units and control systems.
Data Source
AI summary
A device for a vehicle drivetrain has an axle differential, a differential blocking device for blocking and releasing the equalization function of the axle differential, a parking lock for blocking and releasing the drive output of the vehicle drivetrain, and an actuation mechanism configured to be driven by a drive unit. By way of the actuation mechanism, the differential blocking device and the parking lock can be actuated by the drive unit. Actuating the parking lock and the differential blocking device are correlated with one another in such manner that at the end of a first phase of actuation, only the equalization function of the axle differential can be blocked and the parking lock is in its disengaged condition. At the end of a second phase of actuation, the equalization function of the axle differential can be blocked, and the parking lock can be engaged.