Throttle Valve Fastening Portion Rigidity Design
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Solution Overview
Problem
Existing throttle valve units suffer from deformation issues due to low rigidity in the support area, which affects the control of the throttle valve, particularly under fastening forces and radial loads, leading to compromised performance.
Innovation Solution
The throttle valve unit incorporates a fastening portion with mounting and connecting portions arranged at equal intervals around the cylinder portion, providing balanced radial forces and increased rigidity to the support area, along with recessed portions and ribs to enhance structural integrity and reduce deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the support area is made thinner to reduce manufacturing complexity, then ease of manufacture is improved, but rigidity deteriorates causing deformation under fastening forces
Solution Approach 1:
The support area is divided into multiple radial segments (first, second, third support areas) with different thickness characteristics. This segmentation allows each segment to be optimized independently - some areas can be thinner for ease of manufacture while others maintain sufficient thickness for rigidity, resolving the contradiction between manufacturing simplicity and structural strength.
Solution Approach 2:
Different regions of the support area are given different local properties through varying thickness. The first support area has greater thickness for high rigidity requirements, while the second and third support areas have reduced thickness for manufacturing ease. This local differentiation allows the structure to have sufficient strength where needed while being easier to manufacture overall.
2Ease of manufacture
If the fastening portion is designed with simple geometry, then ease of manufacture is improved, but distortion correction capability deteriorates
Solution Approach 1:
The fastening portion is designed with flexible characteristics that allow it to dynamically adapt to the abutment surface geometry during assembly. The structure can elastically deform to accommodate surface irregularities and then maintain the corrected position, providing both ease of manufacture and distortion correction capability.
Solution Approach 2:
The fastening portion's physical parameters (such as thickness, material properties, or geometric dimensions) are optimized to achieve the right balance between manufacturability and distortion correction. By carefully selecting these parameters, the fastening portion can be manufactured simply while still having the capability to correct distortions through controlled deformation.
3Weight of moving object
If the support area has low rigidity to reduce weight, then weight is reduced, but deformation under radial loads increases affecting throttle valve control
Solution Approach 1:
The support area is segmented into multiple zones with different thickness characteristics. This allows the overall weight to be reduced by having thinner sections in less critical areas, while maintaining sufficient rigidity in key support regions to prevent deformation that would affect throttle valve control precision.
Solution Approach 2:
The support area employs a composite structure with varying thickness that creates a lightweight yet stiff configuration. By strategically placing material only where structurally necessary, the design achieves weight reduction while maintaining the rigidity required for reliable throttle valve control under radial loads.
Data Source
AI summary
A throttle valve unit is disclosed that includes a main body having a cylinder portion defining a fluid passage. The main body also includes a fastening portion projecting from an outer peripheral surface of the cylinder portion for fastening to a separate member. The cylinder portion defines an axis. The throttle valve unit also includes a throttle valve that is rotatably supported by the cylinder portion for opening and closing the fluid passage. The throttle valve is supported by the cylinder portion at a support area. The fastening portion is provided at approximately the same axial position relative to the axis as the support area of the throttle valve and includes a plurality of mounting portions for coupling to the separate member and a plurality of connecting portions extending between the mounting portions.