Vehicle HUD Cam Mechanism for Noise Reduction
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Solution Overview
Problem
Conventional head-up display (HUD) systems for vehicles suffer from noise and inefficient opening/closing performance due to the mechanical operation of the combiner and cover, which affects the speed and smoothness of deployment and angle adjustment.
Innovation Solution
The HUD apparatus incorporates a rotating cam with guide grooves and gear members to operate the cover and combiner, allowing for synchronized and noise-reduced movement and angle adjustment, improving the opening/closing performance by reducing the number of parts involved in the operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a lead screw is used to horizontally move and deploy the combiner, then the combiner can be deployed, but the opening/closing speed is limited by the lead screw size and motor speed
Solution Approach 1:
The patent replaces the traditional lead screw mechanism with a cam wheel mechanism. The cam wheel, when rotated by a motor, directly drives the combiner's horizontal movement and deployment through its cam profile, eliminating the need for lead screws and associated mechanical components. This substitution enables faster opening/closing speeds while simplifying the overall mechanical structure.
Solution Approach 2:
The cam wheel mechanism allows for dynamic control of the combiner's movement speed and trajectory. By adjusting the cam profile geometry, the system can optimize the opening/closing speed without being constrained by fixed lead screw parameters, enabling more flexible and faster deployment characteristics.
2Ease of operation
If a pin of a cam wheel operates the combiner through a carrier, then the combiner can be rotated, but the operation may not be smooth and operation noise may be increased
Solution Approach 1:
The patent removes the intermediate carrier component from the cam wheel operation mechanism. The cam wheel pin directly acts on the combiner without requiring a separate carrier, thereby eliminating the additional contact points and potential sources of noise and operational roughness that would arise from the pin-to-carrier-to-combiner interaction.
Solution Approach 2:
The patent introduces a guide groove structure as a smooth guiding intermediary between the cam wheel and combiner. This guide groove ensures smooth relative movement and proper alignment during operation, reducing friction and noise while maintaining the direct action of the cam mechanism.
3Adaptability or versatility
If multiple separate mechanisms are used for cover and combiner operation, then individual control is possible, but the number of parts increases and productivity decreases
Solution Approach 1:
The patent employs a single cam wheel that performs multiple functions: it controls both the cover's opening/closing motion and the combiner's deployment and rotation. By integrating these control functions into one cam wheel mechanism, the system maintains independent control capability while significantly reducing the total number of parts, thereby improving manufacturing productivity.
Solution Approach 2:
The patent merges the control mechanisms for the cover and combiner into a unified cam wheel system. The cam wheel's different profiles or zones simultaneously govern the motion of both components, consolidating what would traditionally require separate actuators and mechanisms into a single integrated structure.
Data Source
AI summary
An HUD apparatus for a vehicle including: a housing mounted in a vehicle; a cover member configured to open/close the entrance of the housing; a combiner operated separately from the cover member, and protruding outward from the inside of the housing; a rotating cam rotatably installed in the housing, rotated by rotation power, and having guide grooves; a first gear member having one side connected to the cover member and the other part inserted into the guide groove, and operated by rotation of the rotating cam so as to move the cover member; and a second gear member having one side connected to the combiner and the other side inserted into the guide groove, and operated by the rotation of the rotating cam so as to move the combiner to the outside or inside of the housing.