Parking Mode Manual Release Mechanism for Shift-by-Wire Transmission
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Solution Overview
Problem
Existing manually releasing devices for parking mode in shift-by-wire type automatic transmissions have complex lever structures and are restricted by battery capacity, limiting their operational effectiveness, especially in abnormal conditions where electric power is unavailable.
Innovation Solution
A parking mode manually releasing device with a simple structure that uses a housing, a sliding rod member, and a locking clip, connected to a cable, allowing manual release of the parking mode without electronic components, enabling operation beyond battery limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electromagnet is used in the manually releasing device, then the parking mode can be released manually, but the device complexity increases and the battery capacity is restricted
Solution Approach 1:
The patent removes the electromagnet component from the manually releasing device, extracting the electronic element that caused complexity and battery dependency. The device now uses only mechanical components (rod member, locking clip, housing) to achieve the same manual release function, thereby simplifying the structure and eliminating battery capacity restrictions.
Solution Approach 2:
The patent replaces the electromagnet-based electronic system with a purely mechanical system. The rod member sliding within the housing and engaging with the locking clip creates a mechanical linkage that directly transfers the cable pulling force to rotate the shift control lever, eliminating the need for electrical power and complex electronic control.
2Reliability
If an electromagnet is used in the manually releasing device, then the parking mode can be released manually, but the operation repetition is restricted due to battery capacity
Solution Approach 1:
By removing the electromagnet and its power supply requirements, the device eliminates the battery capacity constraint that limited the number of operational repetitions. The mechanical system can be operated indefinitely as long as manual force is applied to pull the cable.
Solution Approach 2:
The mechanical system is self-powered through manual operation. Each time the cable is pulled, the rod member slides and rotates the shift control lever without consuming any stored energy. The system serves itself through direct mechanical input from the user, eliminating dependency on battery power for repeated operations.
3Reliability
If a complex lever structure is used, then the parking mode can be released manually, but the device complexity increases
Solution Approach 1:
The patent extracts the complex lever structure from the manually releasing device and replaces it with a simple rod member that slides linearly within the housing. This single rod member directly connects the cable input to the shift control lever output, eliminating the need for multiple levers and linkages while maintaining the manual release function.
Solution Approach 2:
Instead of using a complex lever mechanism to amplify or transform force, the patent inverts the approach by using a direct linear sliding motion of the rod member that naturally translates cable pull into shift control lever rotation. The simplicity of the linear motion path replaces the complexity of multiple lever arms and pivot points.
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
The device allows for a simple and unrestricted manual release of the parking mode in abnormal conditions, ensuring operational flexibility without electronic complications, and maintains normal operation functionality in normal environments.
Implementation Method 1
a rod member (20) arranged in such a way as to slide as far as a predetermined stroke relative to the housing (10)
Data Source
AI summary
A parking mode manually releasing device for a shift-by-wire type automatic transmission is provided. The parking mode manually releasing device includes a housing that has a translational motion in interlock with rotation of a shift control lever of the automatic transmission. Additionally, a rod member is arranged to slide as far as a predetermined stroke relative to the housing and has a locking part and a locking clip is fastened to the housing. When the locking part is locked by the locking clip, the translational motion of the housing is generated in interlock with the sliding motion of the rod member, and the rod member is connected to a cable which is pulled when a parking mode is released manually.