Camshaft Actuator Branching Point Buffer Design
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Solution Overview
Problem
Conventional camshaft adjustment devices are prone to damage due to the actuating element colliding with the 'Y' point at the branching point during reverse rotation of the camshaft, leading to potential bending or breaking of the actuating element.
Innovation Solution
The branching point is redesigned to include an alternative path that continues the common track section beyond the branching point, allowing the actuating element to gently deflect without colliding with the groove wall, and can be in the form of a ramp or an ejection path that diverts the actuating element into an engagement section, ensuring smooth operation during reverse rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the branching point is designed as a Y-shaped convergence of link tracks, then the actuating element can be guided from one coupling section to the common track section, but the actuating element collides with the groove wall at the branching point during reverse rotation, causing damage
Solution Approach 1:
The patent introduces a buffer zone at the branching point of the link tracks, which acts as a cushioning element to absorb the impact when the actuating element collides with the groove wall during reverse rotation. This buffer zone prevents direct hard collision damage to the actuating element, thereby resolving the contradiction between ease of guiding and durability.
2Productivity
If the actuating element is guided directly into the common track section at the branching point, then the adjustment mechanism functions properly, but hard collisions occur during unintended reverse rotation, leading to bending or breaking of the actuating element
Solution Approach 1:
The patent converts the harmful collision effect during reverse rotation into a beneficial controlled interaction by designing the branching point with a buffer zone and specific groove geometry. The actuating element's collision with the groove wall is transformed from a damaging event into a controlled guidance mechanism that still enables proper adjustment function while preventing breakage.
3Device complexity
If the link tracks have a common track section with a Y-shaped branching point, then the structure is compact and functional, but the actuating element is vulnerable to damage during reverse camshaft rotation
Solution Approach 1:
The patent applies local quality by modifying only the critical branching point area of the link tracks while maintaining the overall compact Y-shaped structure. The groove walls at the branching point are given special geometric characteristics (buffer zones, specific angles) to provide enhanced protection locally, where the actuating element is vulnerable, without changing the global compact design.
Data Source
Figure 1~2c
Figure 3
Figure 4a~4b
AI summary
The invention relates to a device for adjusting the camshaft of an internal combustion engine. The camshaft is provided with at least one cam member rotatably disposed thereon and an axial slip ring with two slide tracks. The guideways are each formed in the form of a incorporated in a peripheral surface of the camshaft cam. Both the slide tracks coincide in a common track section in size and direction, The common track section merges at a branch point into two coupled segments axially-extending side by side of one of the two slide tracks. Furthermore, the device has at least one operating element capable of radially coupling to the axial slip rings relative to the camshaft for displacing the cam member in the axial direction. The branch point is designed such that the operating member starting from the common track section to the branch point is guided into a path which form an extended segment, exceeding the branch point, of the common track section along the circumference. The invention also relates to an internal combustion engine containing the device and an axial slip ring used by the device.