Dual Modulus Rubber Damping for Power Transmission Shocks
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Solution Overview
Problem
Existing power transmitting devices face issues with damping members made of general rubber, which fail to effectively absorb shocks during varying torque loads, leading to inefficient power transmission when the internal combustion engine is started, stalled, or operated for quick acceleration.
Innovation Solution
A power transmitting device with a rubber structural body comprising a soft rubber member and a hard rubber member, each with different moduli of elasticity, is interposed between pressing protrusions on coaxially disposed rotors, allowing the appropriate rubber member to deform and absorb shocks based on the applied torque load, ensuring smooth power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a damping member with small modulus of elasticity is used, then smooth power transmission during normal operation is improved, but shock absorption during high torque loads deteriorates
Solution Approach 1:
The damping member is segmented into multiple damping elements with different moduli of elasticity (first damping element with small modulus, second damping element with large modulus). This segmentation allows each element to contribute differently based on operating conditions, resolving the contradiction between smooth operation and shock absorption.
Solution Approach 2:
The invention changes the parameter of modulus of elasticity by using multiple damping elements with different values. The first damping element has a small modulus for smooth operation, while the second has a large modulus for shock absorption. This parameter variation allows the system to adapt to different torque load conditions.
2Reliability
If a damping member with large modulus of elasticity is used, then shock absorption during high torque loads is improved, but smooth power transmission during normal operation deteriorates
Solution Approach 1:
The damping member is divided into multiple damping elements with different moduli of elasticity. The second damping element with large modulus provides shock absorption during high torque loads, while the first damping element with small modulus maintains smooth power transmission during normal operation.
Solution Approach 2:
The invention employs parameter changes by incorporating damping elements with different modulus of elasticity values. The large modulus element activates during high torque conditions for shock absorption, while the small modulus element operates during normal conditions for smooth transmission.
3Device complexity
If a single modulus of elasticity damping member is used, then device complexity is reduced, but adaptability to varying torque loads deteriorates
Solution Approach 1:
Different regions of the damping member have different local qualities in terms of modulus of elasticity. The first damping element has a small modulus suitable for normal operation regions, while the second damping element has a large modulus for high torque load regions. This local quality differentiation enables adaptation to varying torque loads.
Solution Approach 2:
The damping member is constructed as a composite structure with multiple damping elements made of materials or configurations that provide different moduli of elasticity. This composite approach allows the damping member to exhibit multiple elastic characteristics simultaneously, improving adaptability to varying operating 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 device effectively absorbs shocks under both low and high torque loads, ensuring continuous smooth power transmission by utilizing the appropriate elastic characteristics of the rubber members, thereby addressing the limitations of conventional damping members.
Implementation Method 1
a soft rubber member that is elastically deformable to a large extent and has a small modulus of elasticity and a hard rubber member that is elastically deformable to a small extent and has a large modulus of elasticity are interposed between the internal-combustion-engine-side pressing protrusions and the starter-generator-side pressing protrusions
Data Source
AI summary
A power transmitting device includes a first rotor and a second rotor rotatably disposed coaxially with a rotational central axis and in facing relation to each other. A first pressing protrusion projecting from the first rotor and a second pressing protrusion projecting from the second rotor are disposed in relative positions on superposed rotation trajectories. A soft rubber member elastically deformable to a large extent and has a small modulus of elasticity and a hard rubber member elastically deformable to a small extent and has a large modulus of elasticity are interposed between the first and second pressing protrusions. While no relative torque load is being applied to the first and second rotors, the soft rubber member is held in contact with both the first and second pressing protrusions, and the hard rubber member is interposed between the first pressing protrusion and the second pressing protrusion with gaps therebetween.