Timing Adjustment Device Anchoring Structure
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Solution Overview
Problem
Timing adjustment devices for internal combustion engines face challenges in maintaining the precise circumferential positions of components clamped onto a hub element by a central screw, leading to potential rotation and axial movement of disk elements.
Innovation Solution
A timing adjustment device with a disk element featuring an insertion section that fits into a depression on the hub element, utilizing anchoring structures such as radially extending projections or elastically deflectable sections to securely anchor the disk element against rotation and axial movement, ensuring stable integration and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a central screw is used to clamp disk elements onto the hub element, then the assembly process is simplified, but the disk elements may rotate or move axially under tightening torque
Solution Approach 1:
The connection between disk element and hub element is segmented into multiple functional features: the depression in the hub element, the insertion section on the disk element, and the anchoring structure with projections. This segmentation allows each feature to address specific requirements - the depression provides positioning, the insertion section enables assembly, and the anchoring structure prevents rotation and axial movement, thereby resolving the contradiction between simplified assembly and precise positioning.
Solution Approach 2:
The depression is pre-formed in the hub element and the anchoring structure is pre-configured on the disk element before assembly. This preliminary action ensures that when the disk element is inserted and clamped by the central screw, the circumferential position is already predetermined and locked, preventing rotation during tightening while maintaining simple assembly procedure.
2Device complexity
If a central screw is used to clamp disk elements onto the hub element, then the device structure is simplified, but axial movement of the disk element cannot be prevented
Solution Approach 1:
The connection system is segmented into distinct functional elements: the depression for circumferential positioning, the insertion section for assembly, and the anchoring structure with projections for axial stabilization. This segmentation allows the simple central screw to clamp the components while the pre-configured anchoring structure independently prevents axial movement, maintaining both structural simplicity and position stability.
Solution Approach 2:
The anchoring structure with projections acts as an intermediary between the disk element and hub element. These projections engage with corresponding features in the depression to prevent axial movement, while the central screw provides clamping force. This intermediary anchoring mechanism resolves the contradiction by adding minimal complexity to the overall structure while effectively preventing axial displacement.
3Strength
If the central screw is tightened to secure components, then the connection strength is improved, but the trigger wheel may rotate slightly during tightening
Solution Approach 1:
The circumferential position of the trigger wheel is preliminarily determined by the engagement between the insertion section and the depression, and locked by the anchoring structure before the central screw is tightened. This preliminary positioning action ensures that when the screw is tightened to provide connection strength, the trigger wheel cannot rotate, thereby maintaining position accuracy while achieving strong connection.
Solution Approach 2:
The anchoring structure with projections provides preliminary anti-action against rotation before the central screw is tightened. By engaging the projections with the depression features, it creates a mechanical lock that prevents the trigger wheel from rotating during the tightening process, thereby maintaining position accuracy while allowing the screw to provide necessary connection strength.
Data Source
AI summary
A timing adjustment device with axially joined components, clamped by a camshaft central screw on a hub element which maintains the required peripheral position of these components relative to one another within a narrow tolerance range. On a disk element of the timing adjustment device an insert section is formed, which can be inserted into a recess formed in the hub element and, in the region of the insert section, at least one anchoring structure is formed, through which the insert section is anchored on a counter-structure, which is provided by the hub element.