Axially Limited Guide Block Structure for Parking Pawl Retention
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Solution Overview
Problem
Current parking mechanisms with guide blocks face disengagement issues due to insufficient strength and rigidity, particularly in harsh operating conditions, leading to failure of the parking function, and are influenced by space and material constraints.
Innovation Solution
An axially-limited guide device is introduced, where the limiting portion of the parking bracket optimally presses against the guide block to limit axial displacement, ensuring no interference with the parking pawl, and the structure is optimized to eliminate the need for additional parts, thus minimizing cost and modification requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the guide block is fixed by the fourth fixing method (interference amount between housing hole and outer circle), then space requirements are reduced, but the strength and rigidity of the housing become insufficient to satisfy parking mechanism requirements under harsh operating conditions
Solution Approach 1:
The guide block is divided into two functional parts: a guide portion that slides with the parking shift fork and a limiting portion that engages with the parking bracket. This segmentation allows the guide block to achieve both guiding function and axial limitation without relying solely on housing interference fit, thereby improving holding force while maintaining compact space.
Solution Approach 2:
The limiting portion of the guide block acts as an intermediary element between the guide block and the parking bracket. It provides a dedicated engagement surface that mediates the axial limitation function, transferring loads effectively and improving the overall holding force without increasing the interference amount in the housing hole.
2Reliability
If additional parts are added to improve guide block fixation, then the holding force and reliability are improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The limiting portion is integrated into the guide block as a unified structure rather than being a separate part. This merging of functions (guiding + axial limitation) into a single component reduces the total number of parts, simplifies assembly, and maintains high reliability by preventing guide block disengagement through the built-in limiting portion that engages with the parking bracket.
Solution Approach 2:
The guide block is designed with multi-functionality: it provides guiding for the parking shift fork through its guide portion and simultaneously provides axial limitation through its limiting portion. This universal design allows a single component to perform multiple functions that would traditionally require separate parts, thereby reducing device complexity while improving reliability.
Data Source
AI summary
Provided is an axially-limited guide device applied in a parking mechanism. The parking mechanism includes a parking pawl and a parking shift fork that is axially movable. The guide device includes a parking bracket assembly and a guide block. The guide block is configured to be slidably engaged with an execution member at an end of the parking shift fork to allow for a relative rotation of the parking pawl and a rotary shaft. The parking bracket assembly is configured to axially limit the parking pawl and guide the parking shift fork. The parking bracket assembly includes a limiting portion abutting against the guide block. The limiting portion is configured to limit an axial movement of the guide block when the execution member at the end of the parking shift fork is axially disengaged from the guide block. Also provided are a parking mechanism and an automobile.