Rotation Driving Device Anti-Separation Soft Member
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Solution Overview
Problem
Conventional rotation driving devices face issues with the separation of soft members from the knob during high-force manipulation, particularly due to weak adhesive bonding and temperature variations, which can lead to the cover member coming off, making them unsuitable for applications like automobile mounting.
Innovation Solution
A band-shaped soft member with protruding portions is interposed between the rotating member and the cover member, with the protruding portions exposed through openings in the cover member, utilizing the elasticity of the soft member to securely fit into the cover member and prevent separation, and concave-convex engagement to maintain position alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a cover member formed of thermoplastic elastomer resin is attached to the knob using adhesive, then sliding is prevented, but the bonding strength becomes weak under temperature variation or high force application
Solution Approach 1:
The soft member is segmented into multiple protruding portions that fit into corresponding opening portions of the cover member, creating multiple discrete bonding points distributed around the circumference. This segmentation allows the bonding structure to better accommodate thermal expansion and contraction while maintaining overall bonding integrity under temperature variation and high force application.
Solution Approach 2:
The bonding mechanism transitions from a two-dimensional adhesive surface to a three-dimensional interlocking structure. The protruding portions of the soft member extend into the opening portions of the cover member, creating depth-based mechanical engagement that significantly enhances bonding strength beyond what surface adhesive alone can provide.
2Ease of manufacture
If adhesive bonding is used to attach the cover member to the knob, then assembly is simple, but the bonding strength is insufficient for high reliability applications like automobile mounting
Solution Approach 1:
The soft member is divided into multiple protruding portions that correspond to multiple opening portions in the cover member. This segmentation creates multiple discrete mechanical interlocking points distributed around the circumference, providing cumulative bonding strength that far exceeds single-surface adhesive bonding while maintaining relatively simple assembly procedures.
Solution Approach 2:
The bonding mechanism transitions from two-dimensional adhesive surface bonding to three-dimensional mechanical interlocking. The protruding portions extend into the opening portions of the cover member, creating depth-based engagement that significantly enhances bonding strength through physical interlocking rather than relying solely on adhesive chemistry.
3Ease of manufacture
If the soft member is made as a one-piece element, then manufacturing is simplified, but positioning and alignment with the cover member becomes difficult
Solution Approach 1:
The soft member is segmented into multiple protruding portions that correspond to multiple opening portions in the cover member. This segmentation provides inherent positioning features that guide alignment during assembly, ensuring that each protruding portion engages with its corresponding opening portion at the correct location and orientation.
Solution Approach 2:
The protruding portions of the soft member and the opening portions of the cover member are designed to self-align during assembly. The geometric compatibility between these features enables automatic positioning and alignment without requiring additional alignment tools or complex assembly procedures, allowing the components to find their correct relative positions naturally.
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 the soft member from separating and ensures proper alignment, enhancing the structural integrity and ease of assembly, making the device suitable for applications requiring high reliability and durability.
Implementation Method 1
the soft member is formed of a band-shaped member having both end portions, is disposed in an annular shape in which both end portions are opposed to each other, and is interposed between the rotating member and the cover member
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Provided is a rotation driving device for preventing surely a slide-preventing soft member from being separated. A rotation driving device includes a rotating member 2 driven to rotate; a cover member 4 having an outer peripheral surface of a circle shape attached to the outer periphery of the rotating member 2; and a slide-preventing soft member 3 attached to the cover member 4, in which the cover member 4 is provided with a plurality of opening portions 4c disposed in a peripheral wall portion 4b surrounding the outer periphery of the rotating member 2, the soft member 3 is provided with a plurality of protruding portions 3b protruding outwardly, and the soft member 3 is interposed between the rotating member 2 and the cover member 4 in a state where the protruding portions 3b are exposed from the opening portion 4c of the peripheral wall portion 4b of the cover member 4.