Engine Valve System Thrust Restriction Integration
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Solution Overview
Problem
The existing engine valve operating system is complex and difficult to compact due to the large number of components required to restrict movement of the camshaft and rocker shaft in the thrust direction.
Innovation Solution
A compact engine valve operating system is achieved by sharing means for restricting movement in the thrust direction of the camshaft and rocker shaft, using a fixing member with a flange seat that abuts against the rocker arm shaft and the bearing, and a pouch-shaped support hole to inhibit movement, reducing the number of components and simplifying the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual means are provided to restrict movement of the camshaft and rocker shaft in the thrust direction, then the reliability of movement restriction is improved, but the number of components increases and the structure becomes complicated
Solution Approach 1:
The patent merges the movement restriction functions for the camshaft and rocker shaft into a single integrated fixing member. This fixing member simultaneously restricts the thrust direction movement of both the camshaft and rocker shaft, reducing the number of components while maintaining reliable movement restriction for both elements.
Solution Approach 2:
The fixing member is designed to perform multiple functions: it restricts the thrust direction movement of both the camshaft and rocker shaft, and also serves as a support structure for the bearing. This multi-functional design reduces the overall component count while ensuring reliable movement restriction.
2Reliability
If individual means are provided to restrict movement of the camshaft and rocker shaft in the thrust direction, then the reliability of movement restriction is improved, but the system becomes difficult to compact
Solution Approach 1:
By combining the movement restriction functions into a single fixing member, the patent reduces the spatial requirements of the valve operating system. The integrated design eliminates the need for separate restriction mechanisms, allowing for a more compact arrangement of components while maintaining reliable movement restriction.
3Reliability
If multiple components are used to restrict movement of the camshaft and rocker shaft, then the reliability of movement restriction is improved, but the ease of assembly deteriorates
Solution Approach 1:
The patent combines multiple movement restriction functions into a single fixing member that can be installed as one component. This integration simplifies the assembly process by reducing the number of parts to be handled and installed, while maintaining reliable movement restriction through the multi-functional design of the fixing member.
Data Source
AI summary
In an engine valve operating system, a camshaft (36) is supported via a bearing (41) on a cylinder head (5) having an intake valve (29i) and an exhaust valve (29e)provided therein, and an intake rocker arm (38i)and an exhaust rocker arm (38e)are mounted on a rocker arm shaft (42) supported on the cylinder head (5) so as to be parallel to the camshaft (36), the intake rocker arm (38i)and the exhaust rocker arm (38e)respectively providing a connection between the camshaft (36) and the intake valve (29i)and between the camshaft (36) and the exhaust valve (29e). A fixing bolt (44) that abuts against an end part of the rocker arm shaft (42) so as to restrict movement thereof in the thrust direction is screwed into the cylinder head (5), and a flange seat (44a)that abuts against one side face of the bearing (41) so as to restrict movement thereof in the thrust direction is formed integrally with the fixing bolt (44). Therefore, there is provided a compact engine valve operating system in which means for restricting movement in the thrust direction of a camshaft and a rocker shaft is shared to thus reduce the number of components and simplify the structure.