Gearbox Blocking Mechanism With Adjustable Guide Rail Alignment
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Solution Overview
Problem
Existing blocking mechanisms in vehicle drivetrains face issues with geometric defects and deformation under mechanical stress, leading to uneven load distribution and potential jamming of rollers, which can result in unreliable blocking and potential damage.
Innovation Solution
A gearbox with a blocking mechanism that includes a mobile pawl, linear actuator, and guide rail, where the guide rail is attached to the transmission casing with a predefined amount of play to allow adjustment and ensure parallel axes of rotation for the rollers, reducing friction and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the guide rail is rigidly attached to the transmission casing, then the structure is simple and manufacturing is easy, but geometric defects and deformation under mechanical stress cause uneven load distribution and roller jamming
Solution Approach 1:
The guide rail attachment mechanism incorporates controlled mobility through attachment members that allow the guide rail to adjust its position dynamically. This enables the system to adapt to geometric defects and deformation under load while maintaining reliable blocking function.
Solution Approach 2:
The attachment mechanism allows for parameter changes in the guide rail's position and orientation. By permitting controlled movement and adjustment, the system can compensate for manufacturing tolerances and stress-induced deformation, ensuring uniform load distribution across the rollers.
2Reliability
If the guide rail allows movement relative to the transmission casing, then load distribution is improved and roller jamming is prevented, but the attachment mechanism becomes more complex
Solution Approach 1:
The attachment members enable the guide rail to move dynamically relative to the transmission casing, adjusting its position to maintain parallelism between roller axes. This dynamic capability ensures uniform load distribution while using a relatively simple attachment mechanism.
3Manufacturing precision
If manufacturing tolerances are tight to ensure precise geometry, then the guide wall remains perpendicular to the attachment wall, but manufacturing cost and complexity increase
Solution Approach 1:
The attachment mechanism is designed to pre-compensate for manufacturing tolerances. By allowing controlled movement and adjustment, the system ensures proper geometry (perpendicularity between guide wall and attachment wall) without requiring tight manufacturing tolerances, thus simplifying manufacturing.
Data Source
AI summary
A gearbox includes a transmission casing and a blocking mechanism for a vehicle. The blocking mechanism includes a pawl having a locking finger able to be engaged in a locking recess, an actuator which moves a mobile carriage having first and second rollers, and a guide rail attached to the casing. The guide rail forms an attachment wall and a guide wall, the first roller being placed in contact with the second roller and with the pawl, and the second roller being placed in contact with the guide wall. The guide rail is attached to the casing by an attachment mechanism, the guide rail and the attachment mechanism collaborating in such a way that the attachment wall is held against the casing while being able to be moved relative to this same attachment mechanism.