Parking Lock Cam Rollers That Suppress Pawl Disengagement
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Solution Overview
Problem
Existing vehicle parking lock mechanisms face challenges in preventing the parking pawl from disengaging (P-removal) when parked on slopes due to rotational torque, which increases the complexity and cost of the system with additional stopper mechanisms.
Innovation Solution
Incorporating fixing portions on the rollers of the cam mechanism that protrude towards the parking pawl or guide surface, generating sliding friction to increase rotational resistance and prevent disengagement, while maintaining a simpler structure by eliminating the need for additional stoppers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stopper mechanism is added to prevent P-removal, then reliability is improved, but device complexity increases
Solution Approach 1:
The invention extracts the essential function of preventing P-removal from the complex stopper mechanism and implements it through a simplified guide surface structure. The guide surface on the guide member provides the necessary constraint to prevent lock member retraction without requiring additional stopper components, thereby maintaining reliability while reducing device complexity
Solution Approach 2:
The guide member serves multiple functions: it guides the lock member movement, constrains lateral displacement, and prevents P-removal through its guide surface geometry. By making the guide member multi-functional, the invention eliminates the need for separate stopper mechanisms, resolving the contradiction between reliability and device complexity
2Reliability
If additional stopper mechanisms are added, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The invention extracts the P-removal prevention function from additional stopper components and integrates it into the guide member's guide surface. This eliminates the need for separate stopper parts, reducing manufacturing complexity and cost while maintaining the reliability function
Solution Approach 2:
The invention merges the P-removal prevention function with the guide member that already exists in the mechanism. By combining multiple functions into a single component, the invention reduces the total number of parts, simplifying manufacturing and reducing costs while maintaining reliability
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
Effectively suppresses P-removal by increasing rotational resistance through sliding friction, reducing the likelihood of the parking pawl disengaging, and simplifying the mechanism's design and manufacturing costs.
Implementation Method 1
the outer peripheral surface of at least one of the first roller and the second roller includes a fixing portion that in the parking lock state protrudes toward the lock position and is brought into contact with the parking pawl or the guide surface over a predetermined engaging length
Data Source
AI summary
In a vehicle parking lock mechanism, a parking pawl hinders rotation of a parking gear by engaging with the parking gear, and a lock member establishes a parking lock state by bringing the parking pawl closer to the parking gear and moving to a lock position. The cam mechanism includes a pair of a first roller and a second roller provided on the lock member. When the lock member is moved from an unlock position to the lock position, the first roller brings the parking pawl closer to the parking gear to be engaged with the parking gear and the second roller restricts the lock member from displacing in a direction away from the parking pawl. An outer peripheral surface of at least one of the first roller and the second roller includes a fixing portion that protrudes toward the lock position.