Tappet Insert Load Distribution in Injection Pumps
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Solution Overview
Problem
Existing cam followers in injection pumps for motor vehicles face challenges in load transmission and mechanical strain distribution, as the tappet directly supports the pin, leading to inefficient load distribution and potential mechanical stress.
Innovation Solution
A mechanical system where the insert supports the pin, and the tappet body supports the insert, allowing the insert to rest directly against protrusions without an intermediate ring, with local deformations preventing movement and providing antirotation devices, thus simplifying design and assembly while distributing loads effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the tappet body directly supports the pin, then the structure is simpler, but the load transmission is less efficient and mechanical strain increases
Solution Approach 1:
The support function is segmented into two distinct components: the tappet body provides positional support while the insert handles load transmission. This segmentation allows each component to be optimized for its specific function, with the insert providing enhanced load-bearing capability through protrusions that engage with the pin, while the tappet body maintains structural simplicity.
2Reliability
If an intermediate ring is used between the insert and protrusions, then the assembly is more robust, but the design and assembly become more complex
Solution Approach 1:
The insert and protrusions are merged into a direct engagement system where the insert's protrusions directly contact the pin without an intermediate ring. This merging eliminates unnecessary components while maintaining assembly robustness through the direct mechanical engagement between the insert's protrusions and the pin, simplifying both design and assembly procedures.
3Ease of operation
If the insert is freely mounted in the body, then assembly is easier, but the insert may move during operation
Solution Approach 1:
The insert is preliminarily positioned within the tappet body during assembly, and then fixed in place using local deformations of the body. This preliminary positioning allows for easy assembly while the subsequent fixation ensures positional stability during operation, preventing any movement of the insert that could compromise performance.
4Reliability
If local deformations are added to the body, then the insert is securely retained, but manufacturing complexity increases
Solution Approach 1:
Local deformations are introduced to the tappet body to create retention features that secure the insert. These deformations modify the physical parameters of the body material in specific locations, creating engagement points that reliably retain the insert while maintaining overall manufacturing simplicity through straightforward deformation processes.
Data Source
AI summary
A mechanical system comprising: a tappet, including a body; an insert mounted in the body; a pin extending along a first axis; and a roller element movable in rotation relative to the pin around the first axis. The insert supports the pin, while the body supports the insert, along at least one first direction parallel to a second axis which is perpendicular to the first axis. The mechanical system can be integrated into an injection pump and/or a valve actuator.