Vehicle Inside Handle Lock Lever Damping for Impact Noise
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Solution Overview
Problem
The existing inside handle devices for vehicles generate significant impact sounds during locking or unlocking, which are amplified and perceived as abnormal sounds by occupants, necessitating a reduction in these noise levels.
Innovation Solution
Incorporation of an impact absorbing portion on the handle base that absorbs the impact generated by the lock lever's contact with the stopper portion, utilizing a configuration with an impact absorbing wall and protruding pieces to dampen vibrations and redirect the propagation path of vibrations away from the door panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lock lever contacts the stopper portion to limit rotation range, then the locking/unlocking function is achieved, but impact sound is generated and amplified
Solution Approach 1:
A rubber buffer is introduced as an intermediary element between the lock lever and the stopper portion. This buffer absorbs the impact energy during locking/unlocking operations, preventing direct contact between the rigid lock lever and stopper portion, thereby eliminating the amplified impact sound while maintaining the rotational limiting function
Solution Approach 2:
The handle base is constructed using composite materials, specifically combining a resin base material with rubber buffer portions. This composite structure allows the handle base to provide both structural support and vibration damping, reducing the transmission of impact sounds to the door panel while maintaining structural integrity
2Strength
If the handle base is made rigid to support the lock lever, then structural strength is ensured, but vibration transmission to door panel increases
Solution Approach 1:
The handle base employs a composite structure combining rigid resin portions for structural support and rubber buffer portions for vibration absorption. This allows the base to maintain necessary strength while reducing vibration transmission to the door panel
Solution Approach 2:
Different portions of the handle base have different material properties: the main structural portions use rigid resin for strength, while specific areas contactting the lock lever and stopper portion use rubber buffers for vibration damping. This localized differentiation optimizes both strength and vibration reduction
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 impact absorbing portion effectively reduces the hitting sound generated during locking or unlocking by absorbing the impact and damping vibrations, thereby minimizing the noise transmitted to the vehicle's occupants.
Implementation Method 1
an impact absorbing portion provided on the handle base and configured to absorb an impact generated by a contact of the lock lever with the stopper portion
Implementation Method 2
utilizing a configuration with an impact absorbing wall and protruding pieces to dampen vibrations and redirect the propagation path of vibrations
Data Source
AI summary
An inside handle device includes a handle base attached to a door panel of a vehicle; a lock lever rotatably supported on the handle base, a stopper portion provided on the handle base and limiting a rotation range of the lock lever, and an impact absorbing portion provided on the handle base and absorbing impact generated by a contact of the lock lever with the stopper portion.