Variable Valve Apparatus Rocker Arm Coupling Mechanism
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Solution Overview
Problem
Existing variable valve apparatuses face challenges in switching the coupled and released states of rocker arms without a repulsive spring, leading to issues like spring breakage, wear, and increased size and weight, which are not suitable for high-speed engines.
Innovation Solution
A variable valve apparatus configuration that includes a rocker shaft, rocker arms, a coupling pin, a release pin, a pressing member, a transmission member, and a push-back member, where the pressing member pushes the coupling pin into the housing hole of one rocker arm while pushing the release pin out to couple the rocker arms, and the transmission member is pushed back by the push-back member to release the coupling, all without requiring a repulsive spring in the rocker arm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a repulsive spring is disposed in the rocker arm to push back the coupling pin, then the coupled state and released state of rocker arms can be switched, but the spring may break, wear, and increase the size and weight of the apparatus
Solution Approach 1:
The patent extracts the repulsive spring from the rocker arm structure and relocates it to the cylinder head. This separation eliminates the spring from the moving rocker arm assembly, preventing spring breakage and wear while maintaining the switching function. The coupling pin is still pushed back during valve operation, but the spring remains stationary in the cylinder head, solving the durability issue.
Solution Approach 2:
The patent divides the switching mechanism into two separate functional parts: the coupling pin mechanism in the rocker arm and the repulsive spring mechanism in the cylinder head. This segmentation allows the spring to perform its push-back function without being attached to the moving rocker arm, thereby eliminating wear and breakage issues while maintaining reliability.
2Ease of operation
If a repulsive spring is disposed in the rocker arm to push back the coupling pin, then the coupled state and released state of rocker arms can be switched, but the size and weight of the apparatus increase
Solution Approach 1:
The repulsive spring is extracted from the moving rocker arm assembly and positioned in the stationary cylinder head. This eliminates the weight of the spring from the moving components, reducing the overall weight of the moving apparatus while preserving the switching capability between coupled and released states.
3Ease of operation
If a repulsive spring is disposed in the rocker arm to push back the coupling pin, then the coupled state and released state of rocker arms can be switched, but the configuration becomes complex
Solution Approach 1:
By extracting the repulsive spring from the rocker arm and placing it in the cylinder head, the patent simplifies the rocker arm configuration. The rocker arm no longer contains internal spring mechanisms, making its structure simpler and easier to manufacture, while the switching function is maintained through the coupled pin mechanism.
Solution Approach 2:
The cylinder head structure is given an additional function by incorporating the repulsive spring mechanism. This allows the cylinder head to serve both as a structural component and as the housing for the spring that pushes back the coupling pin, thereby avoiding the need for separate spring housing structures and simplifying the overall configuration.
Data Source
AI summary
There is provided a variable valve apparatus including: a plurality of rocker arms; a coupling pin disposed in a housing hole of the rocker arm closer to one side; a release pin disposed in a housing hole of the rocker arm closer to the other side; a pressing member; a transmission member; and a push-back member disposed so as to push back the transmission member from the other side. The pressing member is configured to push the coupling pin into the housing hole of the rocker arm closer to the other side to couple the plurality of rocker arms. The transmission member is configured to push back the coupling pin into the housing hole of the rocker arm closer to the one side to release a coupling of the plurality of rocker arms.