Decompression Mechanism Retaining Ring Assembly
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Solution Overview
Problem
Existing decompression mechanisms for internal combustion engines require high dimension accuracy and are time-consuming to incorporate, especially when integrated with exhaust cams, due to the need for interference fits which reduce tolerance and increase manufacturing complexity.
Innovation Solution
A decompression mechanism with a sleeve and decompression pin configuration that uses an insertion member to secure the sleeve within the valve operating system, allowing for easy integration and reducing the risk of the sleeve coming off, thus simplifying the structure and improving productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sleeve is accommodated in the accommodating hole by an interference fit to prevent the sleeve from coming off due to centrifugal force, then the reliability of the decompression mechanism is improved, but the manufacturing precision requirement increases and the ease of manufacture deteriorates
Solution Approach 1:
The patent introduces a retaining ring as an intermediary component between the sleeve and the accommodating hole. The retaining ring is inserted into the accommodating hole and engages with the sleeve, serving as a mediator that prevents the sleeve from coming off without requiring an interference fit between the sleeve and the accommodating hole. This resolves the contradiction by maintaining reliability while improving ease of manufacture.
2Reliability
If the sleeve is accommodated in the accommodating hole by an interference fit to prevent the sleeve from coming off due to centrifugal force, then the reliability of the decompression mechanism is improved, but the productivity deteriorates due to time-consuming work
Solution Approach 1:
The retaining ring acts as a mediator that simplifies the assembly process. Instead of performing time-consuming interference fit operations to secure the sleeve, the retaining ring can be easily inserted and engaged with the sleeve, significantly reducing assembly time and improving productivity while maintaining the same reliability level.
3Reliability
If the decompression mechanism is incorporated in the exhaust cam with an interference fit structure, then the reliability is improved, but the device complexity increases and the ease of manufacture deteriorates
Solution Approach 1:
The retaining ring introduces a simple intermediary structure that actually reduces overall device complexity compared to an interference fit design. The retaining ring is a separate, easily manufactured component that simplifies the integration of the sleeve into the exhaust cam, making the entire decompression mechanism less complex while maintaining reliability.
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 configuration allows for stable and efficient operation by reducing the torque required to compress the air-fuel mixture at engine start, while also simplifying the manufacturing process and reducing wear on components, thereby enhancing engine productivity and reducing variability in start torque.
Implementation Method 1
a decompression member which is accommodated in the accommodating member such that the decompression member is extendable and retractable, the decompression member being configured to extend from the valve operating system to press the valve to open the port in a compression stroke
Implementation Method 2
an insertion member which is inserted into the valve operating system, the insertion member being configured to be inserted through the accommodating member in a direction crossing a direction in which the decompression member is extendable and retractable
Data Source
AI summary
A decompression mechanism provided in a valve operating system configured to drive a valve for opening and closing a port, includes an accommodating member provided in the valve operating system; a decompression member which is accommodated in the accommodating member such that the decompression member is extendable and retractable, the decompression member being configured to extend from the valve operating system to press the valve to open the port in a compression stroke of the engine; and an insertion member which is inserted into the valve operating system, the insertion member being configured to be inserted through the accommodating member in a direction crossing a direction in which the decompression member is extendable and retractable.