Stamped Roller Tappet Component for High-Pressure Fuel Pump Stability
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Solution Overview
Problem
High-pressure fuel pumps with roller tappets face challenges in maintaining mechanical stability and simplicity while being cost-effective, due to geometric deviations and additional axial forces during operation.
Innovation Solution
A roller tappet design featuring a component with legs and a strap that partially surrounds the tappet, allowing for simplified assembly and enhanced mechanical stability through axial grooves and a circumferential groove, with a flat stamped part that integrates all mounting elements in a single operation, ensuring the roller is securely held without additional parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate components are used to support the roller on the roller tappet, then the roller can be securely held, but the assembly becomes complex and manufacturing cost increases
Solution Approach 1:
The patent combines multiple separate components (first support element, second support element, and circumferential support element) into a single integrated component made from one stamped part. This single component is attached to the roller tappet and provides all necessary support functions for the roller, thereby reducing assembly complexity while maintaining reliability.
2Reliability
If additional components and attachment elements are added to the roller tappet, then the roller can be securely mounted, but the number of parts increases and assembly time increases
Solution Approach 1:
The support elements are integrated into a single stamped part that is attached to the roller tappet as one component. This eliminates the need to assemble multiple separate support elements, reducing assembly time while maintaining secure roller mounting through the integrated structure with its precisely formed attachment features.
3Ease of operation
If the support elements protrude beyond the outer circumference of the roller tappet, then the roller can be easily accessed and installed, but the lifting movement of the roller tappet is interfered with
Solution Approach 1:
The single stamped part is designed with differentiated local features: the support surfaces and attachment elements are positioned to provide easy roller access and installation, while the overall contour of the component is constrained to not protrude beyond the outer circumference of the roller tappet. This local optimization allows the component to provide necessary functionality without generating harmful interference with the lifting movement.
Data Source
AI summary
A high-pressure fuel pump (100) with a roller plunger (1) is disclosed. The roller plunger (1) carries a roller (2) at a free end (4) which interacts with a surface of a cam (6) of a shaft (7). The roller (2) is mounted in the outer wall (24) of the roller plunger (1) by a component (10) that rotatably holds the roller (2) at the free end (4) of the roller plunger (1). The component (10) is made from a stamped part (30).