Actuator Diameter Reduction via Integrated Guide Groove
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Solution Overview
Problem
The existing openable and closable body-opening and closing apparatus requires a significant attachment space due to the configuration of the spindle, spindle nut, guide part, and cylindrical spring, which limits the degree of freedom in layout, particularly in applications where space is constrained, such as near taillights or narrowed frames, and increases the outer diameter of the operating section.
Innovation Solution
The apparatus incorporates a rotary drive member, a driving-force transmission member, a biasing member, and a guide member, where the biasing member is disposed on the outer periphery of the driving-force transmission member, and the guide member is on the outer periphery of the biasing member, eliminating the need for a guide member between them, thereby simplifying the configuration and reducing the diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a guide part with notches and ribs is used to prevent relative rotation of the spindle nut, then the reliability of the opening and closing operation is improved, but the device complexity and outer diameter increase
Solution Approach 1:
The guide part is merged with the spindle nut as an integrated structure. The guide part includes a guide groove formed directly on the outer peripheral surface of the spindle nut, eliminating the need for separate notches and ribs. This integration maintains the rotational prevention function while simplifying the overall configuration and reducing the number of components.
Solution Approach 2:
The complex notched structure with fitted ribs is extracted and replaced with a simpler guide groove structure. The guide groove is formed as a continuous circumferential feature on the spindle nut, removing the need for discrete notches and interference-fit ribs, thereby reducing device complexity while preserving the guiding and rotational restriction functions.
2Reliability
If a guide part with notches and ribs is used to prevent relative rotation of the spindle nut, then the reliability of the opening and closing operation is improved, but the outer diameter of the operating section increases
Solution Approach 1:
The guide part is merged with the spindle nut as an integrated structure. The guide groove is formed directly on the outer peripheral surface of the spindle nut, eliminating the need for separate notches and ribs. This integration maintains the rotational prevention function while simplifying the overall configuration and reducing the number of components.
Solution Approach 2:
The complex notched structure with fitted ribs is extracted and replaced with a simpler guide groove structure. The guide groove is formed as a continuous circumferential feature on the spindle nut, removing the need for discrete notches and interference-fit ribs, thereby reducing device complexity while preserving the guiding and rotational restriction functions.
3Reliability
If multiple components (spindle, spindle nut, guide part, cylindrical spring) are used to achieve the opening and closing function, then the reliability is improved, but the attachment space required increases
Solution Approach 1:
The guide part is merged with the spindle nut as an integrated structure, reducing the number of discrete components. The guide groove is formed directly on the spindle nut, eliminating separate guiding elements and reducing the overall assembly footprint, thereby reducing the attachment space required while maintaining the opening and closing function.
Solution Approach 2:
The spindle nut is given multiple functions: it serves as both the fastening element and the guide structure. The guide groove is formed on the outer peripheral surface of the spindle nut, allowing it to perform both rotational prevention and guiding functions simultaneously, thereby reducing the need for separate components and reducing attachment space.
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 allows the openable and closable body-opening and closing apparatus to be reduced in diameter, enabling easier assembly and operation without increasing the diameter, and allows for rotational restriction without additional components, enhancing its compactness and usability.
Implementation Method 1
a biasing member that is disposed on an outer periphery of the driving-force transmission member and that gives a biasing force to the driving-force transmission member in the rotation axis direction
Data Source
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AI summary
This device for opening and closing an openable-body is provided with a rotary drive member, a driving force transmission member, an urging member, and a guide member. The rotary drive member is driven in a rotating manner by the driving force from a driving unit. The driving force transmission member is driven by the rotary drive member, and moves in the direction of the axis of rotation of the rotary drive member. The urging member is disposed on the outer periphery of the driving force transmission member, and applies a biasing force to the driving force transmission member in the direction of the axis of rotation. The guide member is disposed on the outer periphery of the biasing member, and guides the driving force transmission member. The guide member has a guide part for guiding the driving force transmission member in the direction of the axis of rotation while restricting rotation of the driving force transmission member. Since the driving force transmission member has a guided part that is guided by the guide part, the outer diameter can be reduced.