Camshaft Element Positioning Using Assembly Aid
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Solution Overview
Problem
The existing methods for positioning cam elements on shaft segments in camshafts face challenges in meeting strict positional tolerances due to geometric dimension deviations, leading to potential misalignment and failure to meet customer-specified tolerances.
Innovation Solution
A method involving the use of assembly aid elements, such as assembly sleeves or mandrels, which guide and position cam elements along the shaft segment's longitudinal axis, ensuring precise placement by forming a defined distance and stop points, allowing for accurate alignment and positioning of cam elements on the shaft segment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a tool pushes the cam element along the longitudinal axis of the shaft segment during assembly, then the cam element can be positioned on the shaft segment, but the positional tolerances between individual cams cannot be met due to tolerance deviations of the shaft segment and cam elements
Solution Approach 1:
An assembly aid element is introduced as an intermediary component between the cam element and the shaft segment. This assembly aid element includes a positioning element that engages with a corresponding positioning structure on the shaft segment, thereby mediating the positioning process and enabling precise placement of the cam element while compensating for tolerance deviations in the individual components.
Solution Approach 2:
The assembly aid element is pre-configured with specific geometric dimensions and positioning features before the assembly process. The positioning element of the assembly aid element is designed in advance to match the positioning structure on the shaft segment, allowing the cam element to be positioned accurately without requiring complex adjustment during assembly.
2Manufacturing precision
If the shaft segment is excessively large in length or the cam is wide/narrow, then assembly becomes more difficult, but the known assembly method cannot meet the predetermined positional tolerances
Solution Approach 1:
The assembly aid element serves as a mediator that simplifies the assembly operation regardless of the shaft segment length or cam dimensions. The positioning element provides a reliable reference that guides the cam element into the correct position, making the assembly process equally easy whether the shaft segment is long or short, and whether the cam is wide or narrow.
Solution Approach 2:
The assembly aid element is designed with adjustable or variable geometric parameters that can accommodate different shaft segment lengths and cam widths. By changing the parameters of the assembly aid element (such as the length of the positioning element or the position of the stop element), the same assembly method can effectively handle various component dimensions while maintaining positional tolerance requirements.
3Reliability
If tolerance deviations of the shaft segment and cam elements are considered, then the risk of not meeting customer requirements increases, but stricter tolerances would increase manufacturing complexity
Solution Approach 1:
The assembly aid element acts as a tolerance-compensating intermediary that decouples the tolerance requirements of the final assembly from the individual component tolerances. The positioning element of the assembly aid element absorbs the accumulated tolerance deviations of the shaft segment and cam elements, ensuring that the final positional tolerance meets customer requirements without requiring tighter component tolerances that would increase manufacturing complexity.
Solution Approach 2:
The assembly aid element incorporates self-aligning and self-positioning features that automatically compensate for tolerance deviations during the assembly process. The positioning element engages with the positioning structure on the shaft segment in a way that self-adjusts to accommodate minor variations, reducing the need for complex measurement and adjustment procedures while ensuring reliable fulfillment of customer requirements.
Data Source
AI summary
A method for positioning a cam element on a shaft segment of a camshaft with an assembly aid element may comprise arranging the shaft segment relative to a first tool such that a first distal shaft segment end of the shaft segment lies flush against a surface of the tool that is directed towards the shaft segment; arranging the cam element on the shaft segment in a pre-position; arranging a first distal end of the assembly aid element to contact the surface of the first tool that is directed towards the shaft segment such that the assembly aid element forms a defined distance to the first tool along a shaft-segment longitudinal axis; and moving a second tool at least in sections along the longitudinal axis until the second tool contacts a second distal end of the assembly aid element, and pushing the cam element by means of the second tool to a final position.