Vibration Actuator Sealing Structure for Joint Noise Suppression
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Solution Overview
Problem
Conventional vibration actuators generate noise due to gaps in joint portions between the movable body and elastic supporting bodies, leading to deformation and contact during operation.
Innovation Solution
A vibration actuator design featuring a movable body with a magnet and elastic supporting parts that include an outer and inner circumferential portion joined by a deformation arm, ensuring the movable body is freely movable and reducing noise through a sealing mechanism at the joint portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the movable body is joined to the elastic supporting body at the joint portion, then the movable body is supported to be freely movable, but gaps in the joint portion cause noise generation due to deformation and contact
Solution Approach 1:
A sealing part is introduced as an intermediary component between the movable body and the elastic supporting body at the joint portion. This sealing part fills and seals the gap that would otherwise cause noise, while still allowing the movable body to move freely. The sealing part acts as a mediator that eliminates the harmful gap contact without constraining the necessary motion.
Solution Approach 2:
The sealing part is implemented as a flexible sealing element (such as a rubber or elastomeric ring) that can deform to accommodate the relative motion between the movable body and the elastic supporting body. This flexible sealing structure fills the gap effectively to prevent noise-generating contact while maintaining the freedom of movement through its elastic deformation capability.
2Reliability
If the sealing part is added to seal the joint portion, then noise is suppressed, but the device complexity increases
Solution Approach 1:
The sealing part is implemented as a simple flexible sealing element (such as a rubber or elastomeric ring) that can deform to accommodate the relative motion between the movable body and the elastic supporting body. This flexible sealing structure fills the gap effectively to prevent noise-generating contact while maintaining the freedom of movement through its elastic deformation capability.
Solution Approach 2:
A sealing part is introduced as an intermediary component between the movable body and the elastic supporting body at the joint portion. This sealing part fills and seals the gap that would otherwise cause noise, while still allowing the movable body to move freely. The sealing part acts as a mediator that eliminates the harmful gap contact without constraining the necessary motion.
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 design effectively suppresses noise generation while maintaining high output vibration stability, enhancing the operational performance of vibration actuators.
Implementation Method 1
cooperation between the coil supplied with electricity and the magnet causes the movable body to vibrate with respect to the fixing body
Implementation Method 2
a deformation arm portion coupling together the outer circumferential portion and the inner circumferential portion, the deformation arm portion being elastically deformable
Data Source
AI summary
This vibration actuator comprises a fixed body including a coil, a movable body including a magnet, and an elastic support part that supports the movable body so as to be freely moveable with respect to the fixed body, wherein the coil to which power is supplied and the magnet cooperate to cause the movable body to vibrate with respect to the fixed body. The elastic support part has an outer circumferential part bonded to the fixed body, an annular inner circumferential part disposed inside in the radial direction of the outer circumferential part and bonded to the movable body, and a deforming arm part that couples the outer circumferential part and the inner circumferential part and is elastically deformable. The elastic support part has a sealing part provided in a bonding part between the inner circumferential part and the movable body to seal the bonding part.