Air Intake Valve Link Mechanism for Rattling Suppression
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Solution Overview
Problem
In existing air intake devices for V-type internal combustion engines, the need to overcome the biasing force of a spring results in a large actuator size, as the spring's biasing force is always applied in a direction that requires additional torque to rotate the air intake valve, leading to increased actuator size and potential twisted deformation.
Innovation Solution
The air intake device incorporates a link mechanism with torsion coil springs that bias the link members, allowing the actuator to rotate the air intake valve without directly applying the biasing force to the actuator, thus reducing the actuator's size and preventing twisted deformation by generating the biasing force only between the link members, which are connected via pin members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring is fixed to the valve housing and rotation shaft to suppress rattling, then rattling is suppressed, but the actuator size increases due to additional torque requirement
Solution Approach 1:
The patent introduces link members as intermediary components between the rotation shaft and the spring. The link members transfer the rotational motion while allowing the spring to be positioned such that its biasing force does not directly oppose the actuator's rotation. This intermediary mechanism enables rattling suppression without requiring the actuator to overcome spring biasing torque.
Solution Approach 2:
The patent changes the spatial arrangement by positioning the spring and link members in a configuration where the spring's biasing force acts perpendicular to the rotation direction of the air intake valve. This dimensional repositioning allows the spring to suppress rattling in the link members without creating torque opposition to the actuator's rotational motion.
2Reliability
If the spring biasing force is always applied to the rotation shaft, then rattling is suppressed, but the actuator requires larger capacity to overcome the biasing force
Solution Approach 1:
The link members serve as intermediaries that decouple the spring's biasing force from the rotation shaft's rotational motion. The link members absorb and redirect the spring force, preventing it from being transmitted as opposing torque to the actuator while still maintaining connection stability and suppressing rattling.
Solution Approach 2:
The patent segments the connection mechanism into multiple components: the rotation shaft, multiple link members, and the spring. This segmentation allows the spring to be associated with specific link members rather than directly with the rotation shaft, enabling independent optimization of each component's function and reducing the power requirement of the actuator.
3Reliability
If the spring is fixed to the rotation shaft to suppress rattling, then connection stability is improved, but twisted deformation of the rotation shaft occurs
Solution Approach 1:
The link members act as intermediaries that prevent direct attachment of the spring to the rotation shaft. By distributing the spring's biasing force across multiple link members, the patent eliminates the concentrated torque that would cause twisted deformation of the rotation shaft while maintaining connection stability through the link mechanism.
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 the rotation of air intake valves using a smaller capacity actuator while effectively suppressing rattling between link members, improving the layout freedom of components and preventing twisted deformation of the rotation shaft.
Implementation Method 1
a biasing member whose one side end is engaged to the first link member and whose other side end is engaged to the second link member or the connection member to bias the first link member and the second link member or the connection member so that rattling between the first link member and the second link member is suppressed
Data Source
AI summary
An air intake device includes: an air intake valve provided so as to change intake air by rotation of a rotation shaft; an actuator which is a driving source for rotating and driving the rotation shaft of the air intake valve; a first link member rotatable by a predetermined operation angle about the rotation shaft; a second link member rotatably connected to the first link member; a connection member which connects the first link member and the second link member so as to be rotatable to each other; and a biasing member whose one side end is engaged to the first link member and whose other side end is engaged to the second link member or the connection member to bias the first link member and the second link member or the connection member so that rattling between the first link member and the second link member is suppressed.