In-Vehicle Display Drive Arm Elastic Deflection
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Solution Overview
Problem
Existing in-vehicle screen adjustment devices require multiple parts and increased assembly time due to the need for spring members to apply force between moving members and guide shafts, leading to cost and consistency issues with urging force distribution.
Innovation Solution
An in-vehicle electronic device using rotatably supported drive arms with elastic portions to apply a consistent frictional force between moving members and guide portions, eliminating the need for spring members and reducing part count and assembly time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spring members are provided to urge thrust members against guide shafts, then the moving member can be pressed against the guide shaft to prevent rattling, but the number of parts and assembly man-hours increase, causing cost increase
Solution Approach 1:
The patent combines the drive arm and the urging function into a single integrated component. The drive arm itself is designed with elastic properties to directly urge the moving member against the guide shaft, eliminating the need for separate spring members and thrust members. This merging of functions reduces the number of parts while maintaining the rattling prevention capability.
Solution Approach 2:
The drive arm is designed to serve dual purposes: driving the moving member and simultaneously providing the urging force to prevent rattling. The elastic portion of the drive arm automatically generates the necessary contact force between the moving member and guide shaft through its own deformation, without requiring external spring members.
2Force
If spring members are used with very short length, then the spring constant must be increased to press thrust members against guide shaft with sufficient force, but the urging load greatly fluctuates due to slight change in set length, making it difficult to uniformly press thrust members
Solution Approach 1:
The patent eliminates separate spring members and uses the drive arm's elastic portion to provide urging force. This integration ensures that the urging force is consistently generated through the drive arm's controlled deformation, avoiding the manufacturing precision issues associated with short spring members and their set lengths.
Solution Approach 2:
The patent changes the design approach from using short spring members with high spring constants to using a longer elastic portion of the drive arm with appropriate elastic properties. This parameter change allows for more stable and uniform urging force generation that is less sensitive to manufacturing variations.
3Reliability
If multiple thrust members and spring members are provided in bearing portions, then the moving member can be pressed against guide shafts, but assembly man-hours increase, leading to cost increase
Solution Approach 1:
The patent merges the drive mechanism and urging mechanism into a single drive arm component. This eliminates the need to assemble multiple separate thrust members and spring members, significantly reducing assembly steps and man-hours while maintaining reliable contact between the moving member and guide shafts.
Solution Approach 2:
The drive arm is designed as a multi-functional component that simultaneously provides driving force and urging force. This universal component replaces multiple specialized parts (thrust members and spring members), simplifying both the device structure and the assembly process.
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
The solution allows for a balanced and consistent load application between moving members and guide portions, reducing the risk of rattling and stick-slip, while lowering manufacturing costs and simplifying assembly.
Implementation Method 1
The at least one drive arm has an elastic portion, and the deflection is imparted to the elastic portion, the moving member is urged against the at least one guide portion by elastic force exerted by the deflection of the elastic portion in the direction of the axial center line of the rotation shaft
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
When a drive gear (34) is rotated by a drive motor of a drive source, a first drive arm (21) and a second drive arm (26) rotate in mutually opposite directions, and a moving member (10) on which a display (12) serving as a device main body is mounted moves up and down. An arm portion (22) of the first drive arm (21) and an arm portion (27) of the second drive arm (26) are made of a metal plate and have elastic portions. Due to the deflection of the elastic portions, bearing portions (11a, 11b) provided in the moving member 10 are pressed against a first guide portion (5), and a bearing portion (11c) is pressed against a second guide portion (6).