Throttle Valve Stopper Segmentation for Creep Compensation
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Solution Overview
Problem
The existing throttle apparatus for internal combustion engines experiences creep deformation at the intermediate position stopper, leading to deviations in the relative position between the point of action of the intermediate reaction force and the full close side engaging force, which can result in the valve gear failing to collide with the full close position stopper during valve closure, especially when the throttle body is made of a resin material with low modulus of elasticity.
Innovation Solution
The throttle apparatus includes a full close position limiting member and an intermediate position limiting member, where the intermediate position limiting member conducts the intermediate reaction force to the full close position limiting member, and the full close position limiting member is deformed in a predetermined direction to align the point of action of the full close side engaging force, preventing deviations and ensuring proper valve closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the throttle body is made of resin material with low modulus of elasticity, then manufacturing cost and weight are reduced, but creep deformation occurs at the intermediate position stopper leading to deviation in relative position between force application points
Solution Approach 1:
The stopper is divided into two separate functional components: an intermediate position stopper and a full close position stopper. This segmentation allows each stopper to be independently designed and positioned, enabling the intermediate position stopper to engage with the valve gear at intermediate positions while the full close position stopper ensures accurate full closure, thereby compensating for creep deformation in resin materials
Solution Approach 2:
The full close position stopper acts as an intermediary element that mediates between the valve gear and the final closure position. By introducing this additional stopping mechanism, the system ensures that even if the intermediate position stopper deviates due to creep, the valve gear will still achieve accurate full closure through engagement with the full close position stopper
2Reliability
If the intermediate position stopper is engaged with the return spring, then the valve is held at the intermediate position, but creep deformation causes deviation in the point of action of the intermediate reaction force
Solution Approach 1:
The stopping function is segmented into two distinct stoppers: the intermediate position stopper for holding the valve at intermediate positions, and the full close position stopper for ensuring accurate full closure. This segmentation isolates the creep deformation effects to the intermediate position stopper while protecting the full close position accuracy
Solution Approach 2:
Different regions of the valve gear system are given different functional qualities: the intermediate position stopper region handles intermediate positioning with tolerance for creep, while the full close position stopper region is designed for high-precision full closure engagement, ensuring that the critical full close function maintains accuracy despite deformation in other regions
3Ease of operation
If the valve gear is driven to the full close position, then the valve closes completely, but deviation in point of action prevents proper collision with the full close position stopper
Solution Approach 1:
The full close position stopper serves as an intermediary safety mechanism that ensures accurate full closure engagement. Even if the valve gear's point of action deviates due to creep deformation of the intermediate position stopper, the full close position stopper provides a dedicated engagement point that guarantees proper collision and complete valve closure
Solution Approach 2:
The system incorporates a redundant stopping mechanism (full close position stopper) that compensates for potential deviations caused by creep deformation. This beforehand provision ensures that even if the intermediate position stopper fails to maintain accurate positioning, the full close position stopper is already in place to ensure proper valve closure engagement
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 effectively prevents deviations in the relative position between the point of action of the intermediate reaction force and the full close side engaging force, ensuring reliable valve operation and maintaining the valve in the intermediate opening degree position, even under creep deformation, thereby enhancing the positional accuracy and operational reliability of the throttle apparatus.
Implementation Method 1
The return spring 6 urges the throttle valve 3 from both of a full close position side and a full open position side toward a predetermined intermediate position between a full close position and a full open position of the throttle valve 3
Implementation Method 2
the full close position limiting member is adapted to be deformed in a predetermined direction by the conducted intermediate reaction force while maintaining a substantially constant distance between the point P1 of action of the intermediate reaction force and the point P2 of action of the full close side engaging force
Data Source
AI summary
A full close position limiting member is adapted to be engaged with a valve gear when a valve is driven in a valve closing direction and reaches a full close position of the valve. An intermediate position limiting member is adapted to be engaged with a return spring when the valve is placed on a side of a predetermined intermediate position where a full close position of the valve is located. The intermediate position limiting member receives an intermediate reaction force from the return spring through engagement with the return spring, and the full close position limiting member receives a full close side engaging force from the valve gear. The full close side engaging force and the intermediate reaction force are generally directed in a predetermined direction.