Air Damper Shaft Mount With Split Clamping for Round Axles
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Solution Overview
Problem
Existing air flap rotary drive actuator devices face challenges in achieving a resilient, non-positive and positive fixation on air flap axes, particularly with round axles, as they require mechanical contact that is both resilient and strong enough to transmit torque, while avoiding stress concentration and material limitations.
Innovation Solution
The proposed axle mount design incorporates tension and pressure side components that move in opposite directions, featuring a tension bracket with an internal thread engaging an external nut thread, and a pressure bracket with a V-shaped contact surface, allowing for elastic deformation and stress distribution, thereby enabling a resilient and cost-effective fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resilient mechanical contact is used to fix the air damper shaft, then the fixation is resilient and adaptable, but the strength to transmit torque is insufficient
Solution Approach 1:
The clamp is divided into two separate clamp jaws (first clamp jaw and second clamp jaw) that can be adjusted independently. Each jaw can be positioned to optimally contact the shaft, allowing the resilient adjustment mechanism to provide adaptability while the segmented structure distributes the torque transmission load across multiple contact points, resolving the contradiction between resilient fixation and torque strength.
Solution Approach 2:
The invention employs an adjustable mechanism that allows the clamp jaws to dynamically adapt their position and contact force to the shaft dimensions. This dynamic adjustment capability enables the system to maintain resilient fixation while optimizing the contact area and force distribution to achieve sufficient torque transmission strength, rather than relying on a fixed rigid structure.
2Strength
If the thread in the tension yoke extends to the top surface, then the structural integrity is maximized, but stress concentration occurs leading to material failure
Solution Approach 1:
The invention extracts the problematic thread structure from the critical stress area by positioning the thread below the top surface of the tension yoke. This creates a gap that removes the stress concentration source while maintaining the structural integrity function through the remaining yoke material and alternative load paths, resolving the contradiction between structural integrity and stress resistance.
Solution Approach 2:
The invention converts the potential harm of thread-induced stress concentration into a benefit by deliberately designing the thread to end below the top surface. This creates a stress-free zone at the critical top surface area, and the gap itself becomes a feature that prevents material failure while the thread still provides the necessary mechanical engagement and adjustment capability.
3Strength
If high-resilient and strong materials are used for the tension yoke, then the fixation strength is sufficient, but the manufacturing cost increases
Solution Approach 1:
The invention enables the use of less expensive materials for the tension yoke by designing a structure where the thread does not extend to the top surface. This design change allows the yoke to be made from cost-effective materials like sintered metal while still achieving sufficient fixation strength through the optimized geometry and stress distribution, making the component more economical to manufacture without compromising performance.
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 design ensures a strong, non-positive and positive fixation of the air flap axis, reducing the risk of stress concentration and allowing the use of less resilient materials, while improving the load distribution and longevity of the components.
Implementation Method 1
a thread (internal thread) of the tension yoke engages a thread (external thread) of a nut to enable the tension yoke to move
Implementation Method 2
allowing for elastic deformation and stress distribution
Implementation Method 3
a pressure bracket with a V-shaped contact surface, allowing for elastic deformation and stress distribution
Data Source
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AI summary
The invention is a shaft mount (10) for an air damper rotary actuator and an air damper rotary actuator with such a shaft mount, which has opposing components (12, 14, 16) movable towards an axis (30) on the tension and compression sides, and a tension bracket (12) as a movable component on the tension side. For the movement of the tension bracket, a thread of the tension bracket engages with a thread of a nut (18). The tension bracket has the thread in a tension bracket upper part (12'), and the thread begins on a lower side of the tension bracket upper part and ends below a top side of the tension bracket upper part. The height of the thread in the tension bracket upper part, measured in the axial direction of the nut, is less than the height of the tension bracket upper part, also measured in the axial direction of the nut. Due to this height difference, a circumferential annular gap (50) remains on the top side of the tension bracket upper part.