Shift Lock Mechanism Restraint for Automatic Transmission
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Solution Overview
Problem
Existing shift operating apparatuses for automatic transmissions do not effectively prevent erroneous operations when the shift operating device is in a parking preparatory condition, allowing it to be moved to arbitrary shift positions during the shift from a gear position to the parking position, which compromises vehicle safety.
Innovation Solution
Incorporating a restraint device with a shift-lock mechanism that engages the shift operating device in the parking preparatory condition to restrain motion towards other gear positions while allowing motion towards the parking position, utilizing a combination of solenoids, stopper members, and projected portions on the shaft member to prevent erroneous shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the shift operating device is allowed to move freely between gear positions and parking position through the parking preparatory condition, then the ease of operation is improved, but the reliability deteriorates due to erroneous operations
Solution Approach 1:
A restraint device is introduced as an intermediary mechanism between the shift operating device and the transmission system. This restraint device includes a restraint member that selectively restrains the shift operating device when it is in the parking preparatory condition, preventing erroneous operations while allowing intentional shifts to proceed. The restraint member acts as a mediator that controls the interaction between the operator's input and the transmission's response.
Solution Approach 2:
The restraint device applies preliminary anti-action by automatically restraining the shift operating device when it enters the parking preparatory condition. This preventive measure counteracts potential erroneous operations before they can affect the transmission. The system proactively applies resistance to unwanted movements while permitting legitimate operational sequences.
2Reliability
If the restraint device is added to prevent erroneous operations in parking preparatory condition, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The restraint device is merged with the existing shift operating apparatus structure. The restraint member is integrated into the shift operating device's mechanical structure, sharing common components such as the operating shaft and positioning mechanisms. This integration reduces the need for entirely separate systems and minimizes overall device complexity while achieving the reliability improvement.
Solution Approach 2:
The restraint device is designed to perform multiple functions within a single mechanism. It not only prevents erroneous operations in the parking preparatory condition but also works in conjunction with the existing shift-lock mechanism to provide comprehensive shift control. The restraint member utilizes the same actuating forces and mechanical principles as other shift control components, making it a multi-functional element within the system.
Data Source
AI summary
A shift operating apparatus for an automatic transmission which designed to prevent movement of a shift operating device from a parking preparatory condition from being moved to one of the plurality of other gear positions during shifting from one of the other gear positions to the park position. The shift operating apparatus can include a shift operating device moveable between a park position and plurality of other gear positions other than the park position, a parking position detector for detecting when the shift operating device is in the park position. The shift operating device can be adapted to be moved through a parking preparatory condition when shifting between the park position and plurality of other gear positions. A restraint device can be configured to restrain a motion toward the plurality of other gear positions when the shift operating device is in the parking preparatory condition when shifting from one of the plurality of other gear positions to the parking position.