Lifter Guide Assembly Fastener-Free Retention
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Solution Overview
Problem
The use of mechanical fasteners in lifter guides for internal combustion engines increases manufacturing costs and complexity, as well as assembly time, due to the need for additional components and steps.
Innovation Solution
A lifter guide assembly that utilizes compression members projecting from its ends, which are compressed by the cylinder head to retain the guide in the cylinder block, eliminating the need for mechanical fasteners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical fasteners are used to secure the lifter guide, then the retention reliability is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent removes mechanical fasteners from the lifter guide assembly, extracting the retention function to the compression members themselves. The compression members are integrally formed with the lifter guide body and directly engage the cylinder block through compression, eliminating the need for separate fasteners and reducing overall device complexity while maintaining retention reliability.
Solution Approach 2:
The patent merges the retention function into the compression members that are already part of the lifter guide assembly. The compression members serve dual purposes: guiding the push rod and securing the lifter guide to the cylinder block. This consolidation eliminates separate fastening components and simplifies the overall structure.
2Reliability
If mechanical fasteners are used to secure the lifter guide, then the retention reliability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent removes mechanical fasteners from the lifter guide assembly, extracting the retention function to the compression members themselves. The compression members are integrally formed with the lifter guide body and directly engage the cylinder block through compression, eliminating the need for separate fasteners and reducing overall device complexity while maintaining retention reliability.
Solution Approach 2:
The patent employs compression members that are simpler and less expensive than mechanical fasteners. These compression members are designed to be compressed and deformed during installation to create a permanent mechanical lock, eliminating the need for expensive fasteners while maintaining adequate retention for the application's service life.
3Reliability
If mechanical fasteners are used to secure the lifter guide, then the retention reliability is improved, but the assembly time increases
Solution Approach 1:
The compression members are pre-formed with a configuration that allows them to be compressed during installation. The lifter guide body is prepared with compression members in a state ready to be deformed into the retained position, eliminating the need for separate fastening operations during assembly.
Solution Approach 2:
The compression members are designed to self-secure the lifter guide through their own deformation. When compressed between the cylinder head and cylinder block, the compression members automatically lock the lifter guide in place without requiring additional fasteners or assembly steps, making the assembly process self-completing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces parts costs and simplifies the manufacturing process by eliminating the need for mechanical fasteners, while ensuring secure retention of the lifter guide without additional assembly steps.
Implementation Method 1
The plurality of compression members are compressed by a cylinder head to retain the lifter guide in a cylinder block
Data Source
AI summary
A lifter guide includes a lifter guide body having an outer surface and an inner surface that extend from a first end to a second end. The inner surface defines at least one push rod passage. A plurality of compression members are provided at the first end. The plurality of compression members project proudly from the first end. The plurality of compression members are configured and disposed to be compressed by a cylinder head to retain the lifter guide in a cylinder block. The lifter guide is devoid of mechanical fasteners.