Vibration Damping Device Restriction Portion Gap Prevention
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Solution Overview
Problem
Conventional vibration damping devices face challenges in maintaining effective damping properties due to gaps formed between elastic division walls and elastic bodies when attachment members are displaced, leading to reduced liquid flow and impaired damping performance.
Innovation Solution
The introduction of restriction portions on the first divided body, which sandwiches the radially inner end of the elastic division walls, prevents gaps from forming between the elastic division walls and the second elastic body, ensuring reliable damping by allowing displacement while maintaining the radially inner end portion between the restriction portion and the second elastic body's inner peripheral edge, and reducing the radial end portion size to lower rigidity, thus enhancing the damping performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the joint of the elastic division wall to the first elastic body reinforces the first elastic body, then the structural strength is improved, but the deformability in the axial direction deteriorates
Solution Approach 1:
The first attachment member is divided into a first division body and a second division body, with the elastic division wall extending between them. This segmentation allows the elastic division wall to be sandwiched between the first division body and the second elastic body, enabling relative displacement in the axial direction while maintaining structural integrity through the restriction portion on the first division body.
Solution Approach 2:
The structure is designed to be dynamically adjustable in the axial direction. The elastic division wall can displace axially between the first division body and the second elastic body when loads are applied, allowing the system to adapt to varying load conditions while the restriction portion prevents excessive displacement that would create gaps.
2Reliability
If the attachment members are relatively displaced in the axial direction, then the damping capability is improved, but gaps form between the elastic division wall and the second elastic body
Solution Approach 1:
The restriction portion on the first division body acts as an intermediary element between the elastic division wall and the second elastic body. It prevents the formation of gaps by constraining the axial displacement of the elastic division wall, ensuring continuous contact with the second elastic body while still allowing sufficient displacement for damping operation.
Solution Approach 2:
The restriction portion is pre-configured on the first division body to anticipate and prevent gap formation before it occurs. By establishing this constraint in advance, the structure ensures that the elastic division wall maintains contact with the second elastic body during axial displacement, preserving the liquid flow path and damping capability.
3Reliability
If the radially inner end portion of the elastic division wall is sandwiched between the restriction portion and the inner peripheral edge portion, then gap formation is suppressed, but the device complexity increases
Solution Approach 1:
The first division body is designed with a restriction portion that serves multiple functions: it provides structural support, constrains the elastic division wall to prevent gap formation, and enables axial displacement. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving reliable gap suppression.
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
This configuration reliably suppresses the formation of gaps between the elastic division walls and the second elastic body, ensuring consistent and prolonged damping performance by maintaining the radial length of the first elastic body and preventing deterioration, thereby effectively exhibiting the damping properties.
Implementation Method 1
elastic bodies that join the attachment members
Implementation Method 2
a plurality of elastic division walls, which divide the liquid chamber into a plurality of pressure receiving liquid chambers, are arranged in a circumferentially spaced manner, the pressure receiving liquid chambers being in communication with each other though a restriction passage
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A vibration damping device (10) includes: a cylindrical first attachment member (11) and a second attachment member (12); and an annular first elastic body (13) and an annular second elastic body (14), wherein, a liquid chamber (19) is formed between the elastic bodies, elastic division walls (25) that divide the liquid chamber (19) into a plurality of pressure receiving liquid chambers are arranged, wherein the elastic division wall (25) is joined to the first elastic body (13), and is also in abutment with the second elastic body (14), wherein the second attachment member (12) is divided in the axial direction into: a first divided body (26) to which an inner peripheral edge portion of the first elastic body (13) is joined; and a second divided body (27) to which an inner peripheral edge portion of the second elastic body (14) is joined, wherein the inner peripheral edge portions of the elastic bodies are located side by side in the axial O direction, and wherein the first divided body (26) is provided with restriction portions (26a) to which the inner peripheral edge portion of the first elastic body (13) is joined from radially outward, which are arranged so as to overlap a radially inner end of the elastic division walls (25) in the axial O direction, and the radially inner end of the elastic division wall (25) is sandwiched between the restriction portions (26a) and an outer peripheral edge portion of the second elastic body (14).