Variable Valve Mechanism Switch Pin Arrangement
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Solution Overview
Problem
The existing variable valve mechanism has reduced flexibility in positional relations among its arms, leading to increased size and uneven force application, which compromises balance and requires a swing guide for support.
Innovation Solution
The mechanism features movable switch pins and vertically displaced sub arms, allowing for non-overlapping positions during the base circle phase, enhancing flexibility and balance without the need for a swing guide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If both switch pins are aligned in the arm-width direction, then the coupling and uncoupling function is achieved, but the size of the switch mechanism and arms in the arm-width direction increases
Solution Approach 1:
The patent transitions the arrangement of switch pins from a one-dimensional alignment in the arm-width direction to a two-dimensional non-overlapping arrangement in side view. This dimensional change allows the switch pins to be positioned at different locations without overlapping, reducing the required size in the arm-width direction while maintaining the coupling and uncoupling function.
2Ease of operation
If the first sub arm and second sub arm are positioned on opposite sides in the arm-width direction, then the coupling function is achieved, but the balance in the arm-width direction deteriorates
Solution Approach 1:
The patent employs asymmetric positioning of sub arms relative to the main arm, where the first and second sub arms are not symmetrically placed on opposite sides but rather positioned to achieve both coupling function and balance. This asymmetric arrangement allows for optimized force distribution and improved balance in the arm-width direction.
3Extent of automation
If the switch pins are positioned to couple and uncouple the sub arms, then the three-stage switching function is achieved, but the flexibility of positional relations among the arms is reduced
Solution Approach 1:
The patent implements a dynamic positioning system where the switch pins can move between coupled and uncoupled positions, enabling the arms to adapt their relative positions dynamically. This dynamic arrangement provides flexibility in positional relations while maintaining the three-stage switching function through the movable switch pins.
Data Source
AI summary
A variable valve mechanism includes a first cam and a second cam, a main arm that drives a valve when swinging, a first sub arm that swings when pressed by the first cam, a second sub arm that swings when pressed by the second cam, and a switch device. The switch device includes a first switch pin that moves between a first coupled position between the main arm and the first sub arm and a first uncoupled position, and a second switch pin that moves between a second coupled position between the main arm and the second sub arm and a second uncoupled position. Both switch pins are arranged so as to be displaced from each other in positions where these switch pins do not overlap at least during a base circle phase in which base circles of both cams act.