Electromechanical Park Lock With External Actuator and Shared Pivot
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Solution Overview
Problem
Existing electromechanically actuated parking locks in vehicles are often bulky and require complex assembly, with separate components for the detent and deflection means, leading to increased part counts and assembly challenges, particularly in compact gearbox housings.
Innovation Solution
Integration of a parking lock within the gearbox housing using an electromechanical actuator positioned outside the housing, with a transfer device, detent, and deflection means mounted on a shared bearing point, utilizing a gear wheel and rack mechanism to transfer force perpendicular to the actuator's force direction, and incorporating sealing elements for robust assembly and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the parking lock is integrated within the gearbox housing with shared bearing points, then the device complexity and part count are reduced, but the manufacturing precision and assembly difficulty increase
Solution Approach 1:
The patent combines the detent and deflection means into a single integrated component mounted on a shared bearing point within the gearbox housing. This merging eliminates separate mounting requirements and reduces the overall part count, directly resolving the technical contradiction by prioritizing device simplification over manufacturing precision requirements.
Solution Approach 2:
The shared bearing point serves multiple functions: it supports both the detent and deflection means, acts as a mounting interface for the electromechanical actuator, and provides structural support within the gearbox housing. This multi-functionality reduces the number of components needed while maintaining operational reliability.
2Ease of manufacture
If the electromechanical actuator is positioned outside the gearbox housing, then the ease of manufacture and maintenance are improved, but the volume and sealing requirements increase
Solution Approach 1:
The electromechanical actuator is extracted from the gearbox housing and positioned externally, allowing it to be manufactured and assembled separately. This extraction simplifies the manufacturing process for both the actuator and the gearbox housing, while the actuator can be easily removed and replaced for maintenance without disassembling the gearbox.
Solution Approach 2:
A transfer device with gear wheel and rack mechanism serves as an intermediary between the externally positioned actuator and the internal parking lock components. This intermediary mechanism transmits force perpendicular to the actuator's force direction, enabling external actuation while maintaining compact internal geometry.
3Reliability
If sealing elements are incorporated for robust assembly, then the reliability and protection are improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
Sealing elements are integrated into the shared bearing point assembly and the interface between the external actuator and internal transfer device. By combining sealing functions with existing structural components rather than adding separate sealing systems, the patent improves reliability while minimizing increases in device complexity.
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 reduces the number of parts, simplifies assembly, allows for a compact design, and provides robust sealing and protection against environmental influences, enabling easier maintenance and reduced manufacturing complexity.
Implementation Method 1
utilizing a gear wheel and rack mechanism to transfer force perpendicular to the actuator's force direction
Implementation Method 2
transfer device, detent and deflection means mounted on a shared bearing point, utilizing a gear wheel and rack mechanism
Data Source
AI summary
The invention relates to a gearbox (40) having a park lock (42) which is integrated in a gearbox housing (60) of the gearbox (40). Said park lock comprises a transfer device (48), a detent (50), and a park lock gear (52). Outside the gearbox housing (60) there is an electromechanical actuator (44), which is centred on an interface to the transfer device (48) on the gearbox housing (48) and is sealed off from the gearbox housing (60) there.