Torque Detection Holding Ring with Prevention Wall
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Solution Overview
Problem
The existing torque detection device suffers from sink marks due to uneven thickness in the holding ring, leading to potential sealing issues and air pressure loss when the sealing ring is sucked into thinned concave portions and flange deformation under temperature changes.
Innovation Solution
Incorporating concave portions with prevention walls that are continuous with the flange to prevent sealing ring displacement and deformation, while maintaining equalized thickness and rigidity in the holding ring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the holding ring is molded with synthetic resin material to hold the detection part and magnetic flux collecting rings, then the device structure is simplified and manufacturing is easier, but uneven thickness distribution causes sink marks that degrade sealing performance
Solution Approach 1:
The holding ring incorporates thinned concave portions at specific locations where excessive material would cause sink marks. This local thinning creates uniform thickness distribution in critical areas while maintaining adequate thickness elsewhere, preventing sink marks during molding and improving sealing performance without compromising overall structural integrity
Solution Approach 2:
The prevention wall is formed in advance during the molding process to prevent sealing ring displacement before it can occur. This preliminary structural feature ensures that even if pressure differential occurs later, the sealing ring cannot be sucked into the concave portions, maintaining sealing effectiveness
2Manufacturing precision
If thinned concave portions are formed in the holding ring to equalize thickness and suppress sink marks, then sealing uniformity is improved, but the sealing ring may be sucked into the concave portions under pressure differential
Solution Approach 1:
The prevention wall is designed to counteract the harmful effect of pressure differential before it can cause sealing ring displacement. By providing this physical barrier in advance, the sealing ring is prevented from being sucked into the concave portions even when pressure differential occurs during operation or installation
Solution Approach 2:
The prevention wall acts as an intermediary structure between the concave portions and the sealing ring. It allows the concave portions to exist for thickness equalization while preventing the sealing ring from contacting or being drawn into these concave areas, thus mediating between the conflicting requirements
3Manufacturing precision
If the holding ring thickness is reduced in concave portions to prevent sink marks, then molding quality improves, but the flange may deform under temperature changes
Solution Approach 1:
The holding ring is designed with non-uniform thickness distribution through thinned concave portions located strategically away from the flange. This local thinning prevents sink marks in the ring body while the flange maintains adequate thickness and reinforcement to resist thermal deformation, achieving both molding quality and structural stability
Solution Approach 2:
The holding ring structure is segmented into different functional zones: thinned concave portions for preventing sink marks in the ring body, and a reinforced flange portion for maintaining sealing stability. This segmentation allows each zone to be optimized for its specific function without compromising the other
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
Prevents sealing ring fall into concave portions and flange deformation, maintaining effective sealing and rigidity without shortening the distance between extended outer surfaces.
Implementation Method 1
two magnetic flux collecting rings for collecting a magnetic flux generated by a magnetic circuit forming member provided at a rotating body
Data Source
AI summary
An inventive torque detection device includes: a magnetic circuit forming member provided at a rotating body to which a torque is applied; a magnetic flux collecting ring for collecting a generated magnetic flux; a detection part for detecting, based on the density of the collected magnetic flux, the torque applied to the rotating body; a holding ring, having a flange, for holding the magnetic flux collecting ring and the detection part; and a sealing ring for sealing between the flange and a housing. The holding ring further has: a concave portion for equalizing the thickness of the holding ring at a region thereof close to the flange; and a prevention wall that is continuous with the flange and brought into contact with an inner circumferential face of the sealing ring so as to prevent the displacement of the sealing ring into the concave portion