Flywheel and Damper Assembly for Torque Fluctuation Absorption
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Solution Overview
Problem
Existing power transmission devices struggle to effectively absorb torque fluctuations, necessitating an increase in the inertia amount of the flywheel.
Innovation Solution
The power transmission device incorporates a flywheel with a protruding portion that extends radially outward and axially, along with a damper device, to enhance inertia, and includes a torque limiter unit to manage torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inertia amount of the flywheel is increased to absorb torque fluctuation more effectively, then the torque fluctuation absorption capability is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The flywheel is segmented into a body portion and a separate protruding portion that can be attached to the attachment portion. This segmentation allows the protruding portion to be designed independently to increase inertia without complicating the entire flywheel structure, as only the additive portion requires complex geometry.
Solution Approach 2:
The protruding portion is nested onto the body portion through the attachment portion, creating a modular assembly. This nesting approach allows the inertia-increasing feature to be integrated into the existing flywheel structure without requiring complete redesign of the entire component.
2Reliability
If a protruding portion is added to the flywheel to increase inertia, then the inertia amount is improved, but the manufacturing precision requirements increase
Solution Approach 1:
By separating the protruding portion from the body portion as distinct components, the manufacturing precision requirements are localized to the attachment interface rather than the entire flywheel. The protruding portion can be manufactured separately with controlled tolerances and then assembled.
Solution Approach 2:
The attachment portion acts as an intermediary element between the body portion and the protruding portion. It provides standardized connection features (such as holes or engagement surfaces) that simplify the manufacturing of both connected parts, as the complex geometry is confined to the protruding portion while the attachment interface uses conventional, easily manufactured features.
3Reliability
If the flywheel structure is modified to include radial and axial protrusions, then the inertia amount is increased, but the ease of manufacture decreases
Solution Approach 1:
The protruding portion is manufactured as a separate component from the body portion, allowing each to be optimized for their specific manufacturing processes. The body portion can be produced using conventional methods, while the protruding portion can be fabricated using techniques best suited for creating complex three-dimensional geometries.
Solution Approach 2:
The protruding portion is designed to nest onto the body portion through the attachment portion, creating a modular assembly that simplifies manufacturing. Each module can be manufactured independently using appropriate processes, then assembled through standardized connection features, avoiding the need to manufacture the entire complex geometry in a single piece.
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 effectively increases the flywheel's inertia and manages torque fluctuations, enhancing the device's ability to absorb and limit torque, thereby improving operational stability.
Implementation Method 1
an inertia amount of a flywheel is required to be increased... the first protruding portion is disposed radially outward with respect to the attachment portion... the first protruding portion protrudes toward a first axial side with respect to the attachment portion
Implementation Method 2
Power transmission devices are configured to absorb torque fluctuation of an engine... The damper device is disposed on the first axial side with respect to the body portion... the damper unit is configured to absorb torque fluctuation
Implementation Method 3
The torque limiter unit is configured to restrict transmission of torque with a predetermined value or more... The torque limiter unit is disposed radially outward with respect to the damper unit
Data Source
AI summary
A power transmission device includes a flywheel with increased inertia and a damper device. The flywheel includes a body portion, an attachment portion, and a first protruding portion. The attachment portion is disposed radially outward with respect to the body portion. The first protruding portion is disposed radially outward with respect to the attachment portion. The first protruding portion protrudes toward a first axial side with respect to the attachment portion. The damper device is disposed on the first axial side with respect to the body portion. The damper device is attached to the attachment portion.