Damper Device Clamping Protrusion Rigidity Design
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Solution Overview
Problem
Conventional damper devices face issues with damage to the clamping protrusion of the resin spring seat and attachment abnormalities due to large vibration inputs from the engine.
Innovation Solution
A damper device design featuring a resin spring seat with a seat portion, an overhang portion, and clamping protrusions where the outer diameter direction side has a low-rigidity portion and the inner diameter direction side has a high-rigidity portion, allowing for elastic deformation and maintaining attachment stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the clamping protrusion is made with uniform high rigidity to maintain attachment stability, then the attachment reliability improves, but the protrusion becomes susceptible to damage under large vibration inputs
Solution Approach 1:
The clamping protrusion is designed with non-unrigid structure consisting of a root portion and a tip portion. The root portion has high rigidity to maintain attachment stability, while the tip portion has low rigidity to absorb vibration energy and prevent damage. This local differentiation of mechanical properties resolves the contradiction between attachment reliability and damage resistance.
2Ease of manufacture
If the spring seat structure is simplified for ease of manufacture, then the manufacturing cost decreases, but the ability to suppress attachment abnormalities under vibration deteriorates
Solution Approach 1:
The spring seat is segmented into distinct functional portions: a seat portion for supporting the coil spring, an overhang portion for covering the spring, and clamping protrusions for attachment. This segmentation allows each portion to be optimized for its specific function while maintaining overall manufacturing simplicity through integration as a single resin component.
Solution Approach 2:
Different regions of the spring seat are designed with different rigidity characteristics. The clamping protrusion has a non-unrigid structure with varying stiffness along its length, while other portions maintain appropriate rigidity for their functions. This local quality differentiation enables the seat to absorb vibrations without compromising manufacturing ease.
3Area of stationary object
If the overhang portion is extended further in the circumferential direction to better cover the coil spring, then the spring coverage improves, but the risk of attachment abnormality increases under large vibrations
Solution Approach 1:
The overhang portion is designed with specific dimensional constraints in the circumferential direction to provide adequate spring coverage while preventing excessive movement that could lead to attachment abnormalities. The length is optimized to balance coverage requirements with attachment stability under vibration conditions.
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 attachment abnormalities and damage to the clamping protrusion by allowing elastic deformation in low-rigidity areas and maintaining rigidity in high-rigidity areas, ensuring secure attachment and durability.
Implementation Method 1
the outer diameter direction side of the spring central axis is a low-rigidity portion with a relatively lower rigidity, while the inner diameter direction side of the spring central axis is a high-rigidity portion with a relatively higher rigidity
Data Source
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AI summary
To provide a damper device capable of suppressing damages to the clamping protrusion of the resin spring seat and generation of attachment abnormalities in the attaching portion of the rotating body. The damper device comprising a second spring seat (42) that supports the two ends of a first coil spring (31) and a second coil spring (32), which are interposed in the circumferential direction between a hub plate (1) and an input-output plate (2), wherein the second spring seat (42) comprises a pair of clamping protrusions (46, 46) which are protruded from a seat portion (43) having a spring seating surface (43a) so as to be able to clamp an attaching portion (24b) of an intermediate plate-side support arm (24), and the clamping protrusion (46) is configured so that the device outer diameter direction side of the spring central axis (Sc) is a low-rigidity portion (46a) with a relatively lower rigidity, while the device inner diameter direction side of the spring central axis (Sc) is a high-rigidity portion (46b) with a relatively higher rigidity.