Vehicle Roof Deflector U-Shaped Wire Biasing Mechanism
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Solution Overview
Problem
Existing deflector devices for vehicles suffer from increased sliding resistance and noise due to the use of leaf springs, which can lead to larger sliding sounds when the deflector arm rotates.
Innovation Solution
A deflector device featuring a U-shaped wire material as the biasing member, where both tip ends approach each other and form an R-shaped part, is used to bias the deflector arm, reducing surface contact and sliding resistance by maintaining point contact during rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a leaf spring is used as the biasing member, then the deflector arm can be biased in the separation direction, but the sliding resistance increases and sliding noise becomes larger
Solution Approach 1:
The patent changes the geometric parameters of the biasing member from a flat leaf spring to a wire material bent into a U-shape with an R-shaped portion. This parameter change transforms the contact geometry from face contact to line contact, reducing the sliding area and consequently reducing sliding noise while maintaining the biasing function
Solution Approach 2:
The patent applies local quality by creating a specific R-shaped contact portion on the wire material that locally concentrates the biasing force into a line contact area. This localized geometric feature reduces the sliding area at the critical contact point between the biasing member and deflector arm, thereby reducing sliding noise
2Force
If a leaf spring is used as the biasing member, then the deflector arm can be biased in the separation direction, but the sliding resistance increases
Solution Approach 1:
The patent changes the geometric parameters of the biasing member from a flat leaf spring to a wire material bent into a U-shape with an R-shaped portion. This parameter change transforms the contact geometry from face contact to line contact, reducing the sliding area and consequently reducing sliding resistance and energy loss
Solution Approach 2:
The patent applies local quality by creating a specific R-shaped contact portion on the wire material that locally concentrates the biasing force into a line contact area. This localized geometric feature reduces the sliding area at the critical contact point between the biasing member and deflector arm, thereby reducing sliding resistance
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 use of a U-shaped wire biasing member reduces sliding resistance and noise by minimizing the sliding area between the biasing member and the deflector arm, enhancing the device's operational smoothness and durability.
Implementation Method 1
a biasing member which is installed in a state of being abutted on the deflector arm so that one end side thereof is assembled to the deflector base and the other end side thereof biases the deflector arm in a direction in which the deflector arm is separated from the roof opening portion
Data Source
AI summary
A deflector device includes: a deflector base fixed to side edge portions of a roof opening portion provided in a roof of a vehicle; a deflector arm assembled to the deflector base to extend along the side edge portions and rotatably supported to approach and separate from the roof opening portion in response to an opening and closing operation of a panel for opening and closing the roof opening portion; a deflector unit configured to be deployed when the deflector arm is separated from the roof opening portion and to be stored when the deflector arm approaches the roof opening portion; and a biasing member installed such that one end side thereof is assembled to the deflector base and the other end side thereof biases the deflector arm in a direction in which the deflector arm is separated from the roof opening portion.