Opening/Closing Body Lock Structure for Quiet Rotation Limiting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing locking devices for opening and closing bodies, such as automobile glove boxes, fail to adequately suppress striking noise and impact absorption during rotation, leading to unsatisfactory noise reduction.
Innovation Solution
A locking device with a rotation body, elastic member, and sliding contact portion that attenuates rotational speed through sliding contact, using a stopper portion biased in the opposite direction to the rotation body's predetermined motion to cushion the rotation and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rotation body is used to drive the locking mechanism, then the locking function is achieved, but striking noise occurs during rotation due to impact against the stopper portion
Solution Approach 1:
The patent applies beforehand cushioning by providing a sliding contact portion on the rotation body that contacts the elastic member before the protruding portion reaches the stopper portion. This gradual deceleration through elastic contact prevents direct impact and reduces striking noise while maintaining the locking function.
Solution Approach 2:
The elastic member serves as an intermediary between the rotation body and the stopper portion. The sliding contact portion transfers rotational motion to the elastic member, which gradually absorbs the kinetic energy and reduces the impact force when the protruding portion contacts the stopper portion, thereby reducing noise.
2Ease of operation
If the stopper portion is positioned to restrict rotation, then rotation is limited, but impact absorption is insufficient leading to noise
Solution Approach 1:
The sliding contact portion is positioned to contact the elastic member before the protruding portion reaches the stopper portion. This beforehand cushioning gradually decelerates the rotation body through elastic deformation, reducing the impact force and noise when rotation is restricted.
Solution Approach 2:
The patent changes the parameter of rotational speed by using the elastic member to gradually reduce the speed of the rotation body before it contacts the stopper portion. This parameter change from high speed to low speed reduces the impact force and associated noise.
3Manufacturing precision
If a rigid stopper structure is used to restrict rotation, then rotation is precisely limited, but noise increases due to direct impact
Solution Approach 1:
The patent changes the physical state of the stopping mechanism from rigid to elastic by introducing an elastic member with a sliding contact portion. This parameter change allows the system to maintain precise rotation limiting while reducing noise through elastic deformation and gradual deceleration.
Solution Approach 2:
The patent uses composite materials by combining the rigid rotation body with the elastic member. The sliding contact portion made of elastic material provides both precise rotation limiting and noise reduction through its elastic properties, creating a composite structure that achieves both precision and quiet operation.
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 device effectively reduces striking noise by cushioning the rotation of the rotation body, utilizing the elastic member's sliding contact to attenuate rotational speed and stop the rotation smoothly, thereby minimizing noise.
Implementation Method 1
an elastic member (90) having a base portion (91) locked and supported by a support portion (51) provided on the base (11), and a stopper portion (92) configured to restrict a maximum rotation position of the rotation body (60)
Implementation Method 2
A part of the outer periphery of the rotation body is provided with a sliding contact portion (76) that is configured to come into sliding contact with the elastic member (90) in a process in which the protruding portion (72) approaches the stopper portion (92)
Data Source
AI summary
There is provided a locking device for an opening and closing body, including: a locking portion; a base; a rotation body that includes a protruding portion on a part of an outer periphery thereof; a locking member; and an elastic member that includes a base portion, and a stopper portion configured to restrict a maximum rotation position of the rotation body in a predetermined direction by abutting against the protruding portion of the rotation body. The stopper portion is disposed in a manner of being biased in a direction opposite to the predetermined direction relative to the base portion. A part of the outer periphery of the rotation body is provided with a sliding contact portion that is configured to come into sliding contact with the elastic member in a process in which the protruding portion approaches the stopper portion.