Stepped Valve Shaft Assembly for Low-Cost Gap Control
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Solution Overview
Problem
The existing valve devices for turbine housings require precise control of dimensional tolerances to manage the gap between the mounting plate and the position regulating portion, leading to increased costs due to the need for high-accuracy machining.
Innovation Solution
The valve device incorporates a shaft portion with a larger-diameter and smaller-diameter portion, featuring a stepped surface, and a position regulating portion attached to the smaller-diameter portion, allowing for adjustable positioning to control the gap between the mounting plate and the position regulating portion, reducing the need for precise machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the position regulating portion is swaged to the end of the shaft portion and dimensional tolerance is strictly controlled, then the gap between the mounting plate and position regulating portion is correctly controlled, but machining cost increases
Solution Approach 1:
The invention changes the dimensional parameters of the shaft portion by introducing a stepped configuration with different diameter sections. The first diameter section has a larger diameter than the second diameter section, creating a stepped surface that serves as a positioning reference. This parameter change allows the position regulating portion to be positioned at a predetermined distance from the mounting plate through the stepped geometry itself, rather than relying on strict tolerance control of the entire shaft portion, thereby reducing machining costs while maintaining gap control precision.
2Manufacturing precision
If high-accuracy machining is performed on valve and mounting plate surfaces, then the gap control is improved, but manufacturing cost increases
Solution Approach 1:
The invention introduces a stepped surface with distinct diameter changes on the shaft portion, creating geometric features that serve as built-in positioning references. This parameter change allows for gap control through the stepped geometry configuration rather than requiring high-accuracy machining of all surfaces. The stepped surface provides inherent positioning functionality that reduces the need for expensive high-precision machining on the valve and mounting plate surfaces.
3Adaptability or versatility
If the position regulating portion is attached at a position spaced apart from the stepped surface, then adjustable positioning is enabled for gap control, but device complexity increases
Solution Approach 1:
The invention incorporates a stepped configuration on the shaft portion with a first diameter section and a second diameter section having different diameters. This creates a stepped surface that provides a predetermined positioning reference. By attaching the position regulating portion at a position spaced apart from this stepped surface along the shaft axis, the invention enables adjustable positioning capability. The stepped geometry itself serves as the positioning mechanism, providing adaptability without requiring additional complex positioning devices or mechanisms.
Data Source
AI summary
A valve device includes: a mounting plate including a rotary shaft; an insertion hole formed in the mounting plate; a valve including a shaft portion inserted into the insertion hole; a larger-diameter portion of the shaft portion, at least a part of the larger-diameter portion being located within the insertion hole; a smaller-diameter portion of the shaft portion, a diameter of the smaller-diameter portion being smaller than that of the larger-diameter portion; a stepped surface formed between the larger-diameter portion and the smaller-diameter portion on the shaft portion; and a position regulating portion provided on the smaller-diameter portion, the position regulating portion being attached on the smaller-diameter portion at a position spaced apart from the stepped surface in a central axis direction of the shaft portion.