Vehicle Door Driving Device Link Member Noise Reduction
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Solution Overview
Problem
Existing driving devices for opening and closing vehicle doors, such as back doors or trunk lids, generate impulsive noises due to the interaction of the solenoid's plunger with a fixed iron core and the engagement of the lock pin with the ball screw mechanism, leading to an uncomfortable user experience and reduced luxury feel.
Innovation Solution
A driving device incorporating a motor, rod member, clutch, nut member, connection member, and a rotation inhibiting mechanism with an engagement member, engaged portion, solenoid, and link member, which allows for secure stopping of the opening/closing body at arbitrary positions while reducing noise through mechanical engagement and vibration modification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solenoid with a plunger is used to engage the lock pin with the ball screw mechanism, then the opening/closing body can be stopped at arbitrary positions, but impulsive noise is generated when the plunger collides with the fixed iron core
Solution Approach 1:
A link member with a mechanical structure is introduced as an intermediary between the solenoid plunger and the engagement mechanism. This link member absorbs and dampens the impact forces, preventing direct collision between the plunger and fixed iron core, thereby reducing impulsive noise while maintaining positioning accuracy
Solution Approach 2:
The mechanical structure of the link member is designed to provide cushioning before the engagement occurs. The structure includes elements that deform or compress during the engagement process, absorbing impact energy in advance and preventing the generation of loud metallic clanks
2Object-generated harmful factors
If a silence solenoid is used to reduce noise, then the impulsive noise is reduced, but the solenoid cannot generate enough power for the opening/closing apparatus
Solution Approach 1:
The link member acts as a mechanical intermediary that transmits force from the solenoid to the engagement mechanism while modifying the force transmission characteristics. This allows the use of a higher-power solenoid that can reliably engage the mechanism without requiring the solenoid itself to be silent, as the link member manages the impact
Solution Approach 2:
The engagement mechanism is designed with dynamic elements that allow controlled movement and energy absorption during engagement. The system transitions from a static, rigid engagement to a dynamic process where energy is managed through controlled deformation and movement, maintaining power while reducing noise
3Reliability
If the engagement member directly engages with the engaged portion on the rod member, then the rotation is inhibited securely, but the mechanical engagement generates loud metallic clanks
Solution Approach 1:
The link member serves as a mediator between the engagement member and the engaged portion on the rod member. It provides a compliant connection that maintains secure engagement while reducing the severity of impact forces during engagement, thereby eliminating loud metallic clanks
Solution Approach 2:
The mechanical structure of the link member changes the physical parameters of the engagement process, such as extending the engagement time and reducing peak impact forces. This transforms the engagement from a sudden, noisy event to a more gradual, quieter process while maintaining reliability
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 effectively reduces impulsive noise and changes its tone range, enhancing user comfort and maintaining the durability of the clutch by using a mechanical structure that inhibits rotation and modifies vibration conditions, allowing the opening/closing body to be securely stopped at arbitrary positions without compromising the clutch's durability.
Implementation Method 1
an impulsive noise is generated when a movable iron core, which is the plunger of the solenoid, is attracted electromagnetically and collides with a fixed iron core in a casing
Data Source
AI summary
A driving device for opening and closing an opening/closing body of a vehicle. The driving device comprises a nut member that moves linearly by way of rotation of a rod member and is threadably engaged with the rod member, and an engaging member that can be engaged with an engagement-receiving member provided on the rod member that is moved by way of a link arm linked to actuation of a solenoid such that rotation of the rod member can be stopped. The link arm has a mechanical structure that limits vibrations that change the vibration status of the engaging member. By using this driving device, impact noise during actuation of the driving device can be mitigated, or the pitch of the noise can be altered, so as not to discomfort passengers.