Power Transmission Device Float Member Inertia Control
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Solution Overview
Problem
Existing power transmission devices face challenges in reducing rotational fluctuation values of output-side rotary members, which affects vibration attenuation performance.
Innovation Solution
A power transmission device configuration that includes an input-side rotary member, an output-side rotary member, a first elastic member, a restriction member, and a float member, where the restriction member is attached to the output-side rotary member and includes a first restriction part, and the float member is rotatable relative to both input and output-side rotary members, with the inner peripheral end of the float member positioned between the output-side rotary member and the first restriction part to restrict axial movement, thereby increasing inertia and reducing rotational fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the restriction member is attached to the output-side rotary member, then the inertia amount of the output-side rotary member increases and rotational fluctuation value is reduced, but the device complexity increases
Solution Approach 1:
The float member is designed to perform multiple functions: it acts as a restriction member to increase inertia and reduce rotational fluctuations, while also serving as a support part to restrict radial movement of the first elastic member, and functioning as a dynamic damper. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity while achieving the goal of reducing rotational fluctuation values.
2Stability of the object's composition
If the first restriction part is disposed at an interval from the output-side rotary member in the axial direction, then axial movement of the float member is restricted, but the length of the power transmission device increases
Solution Approach 1:
The float member is positioned within the axial space between the output-side rotary member and the first restriction part, effectively nesting components within each other's axial clearance. This allows the first restriction part to be disposed at an interval from the output-side rotary member while the float member utilizes this space, restricting axial movement without proportionally increasing the overall axial length of the device.
3Object-affected harmful factors
If the float member is rotatable relative to the input-side rotary member and the output-side rotary member, then the float member can attenuate vibrations, but the reliability of power transmission decreases
Solution Approach 1:
The float member is designed to be rotatable relative to both the input-side and output-side rotary members, allowing it to dynamically adjust and attenuate vibrations through relative motion. This dynamic capability enables the float member to absorb and dampen rotational fluctuations and vibrations while maintaining reliable power transmission through the elastic coupling provided by the first elastic member.
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 configuration enhances vibration attenuation performance by reducing rotational fluctuation values of the output-side rotary member, effectively inhibiting fluctuations in rotational velocity and improving power transmission stability.
Implementation Method 1
a first elastic member (4), which couples the input-side rotary member (2) and the output-side rotary member (3) so as to allow relative rotation between the input-side rotary member (2) and the output-side rotary member (3)
Implementation Method 2
the restriction member (5) is attached to the output-side rotary member (3). Therefore, the inertia amount of the output-side rotary member (3) increases by the amount of the restriction member (5), and a rotational fluctuation value of the output-side rotary member (3) can be reduced
Data Source
AI summary
A lock-up device includes an input-side rotary member, an output-side rotary member, an outer peripheral side torsion spring, a restriction member and a float member. The restriction member is attached to the output-side rotary member. The restriction member includes a first restriction part. The first restriction part is disposed at an interval from the output-side rotary member in an axial direction. The float member is rotatable relatively to the input-side rotary member and the output-side rotary member. An inner peripheral end of the float member is disposed between the output-side rotary member and the first restriction part in the axial direction.