Damper Torque Limiter Layout for Compact Radial Packaging
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Solution Overview
Problem
Existing damper devices with torque limiters increase in radial dimension, hindering compactness, as the torque limiter is typically positioned on the outer peripheral side, which obstructs the achievement of a compact design.
Innovation Solution
The damper device incorporates a torque limiter unit with an annular plate fixed to the inner peripheral part of the first plate, overlapping with the outer peripheral part of the damper unit, coupled by a fixation member, along with a hub flange and elastic members, to restrict torque transmission while maintaining compactness by overlapping radial dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the torque limiter is disposed on the outer peripheral side of the damper part, then the torque limiter function is achieved, but the radial dimension of the damper device increases
Solution Approach 1:
The torque limiter unit is nested within the radial space of the damper unit by positioning the annular plate on the inner peripheral side of the first plate. The annular plate overlaps with the outer peripheral part of the damper unit in the radial direction, allowing the torque limiter to be contained within the existing radial envelope rather than extending it outward.
Solution Approach 2:
The invention transitions from a radial arrangement (torque limiter on outer peripheral side) to an axial arrangement (annular plate on inner peripheral side). By utilizing the axial dimension and overlapping components in the radial direction, the design achieves torque limiting functionality without increasing the radial dimension of the overall device.
2Reliability
If the annular plate is fixed to the outer peripheral part of the first plate, then the torque limiter is disposed outside the damper part, but compactness in size is hindered
Solution Approach 1:
The torque limiter unit and damper unit are merged into a single integrated structure. The annular plate of the torque limiter is positioned to overlap with the outer peripheral part of the damper unit, and both units share common components (first plate, fixation members), eliminating the need for separate radial spacing and achieving compact integration.
Solution Approach 2:
The torque limiter unit is nested within the radial envelope of the damper unit. By positioning the annular plate on the inner peripheral side and allowing it to overlap with the outer peripheral part of the damper unit, the torque limiter is contained within the existing radial space rather than extending the overall volume.
3Reliability
If the torque limiter is positioned on the outer peripheral side, then torque limiting is achieved, but the device complexity increases due to additional radial space requirements
Solution Approach 1:
The first plate serves dual functions: as a structural component of the damper unit and as a mounting surface for the torque limiter unit. The fixation members simultaneously secure both the annular plate and the outer peripheral part of the first plate, reducing the number of separate fastening systems and simplifying the overall structure.
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 limits excessive torque transmission while inhibiting the radial expansion of the damper device, thereby achieving a more compact design without compromising the torque limiter function.
Implementation Method 1
The plurality of elastic members elastically couple the hub flange and the first and second plates in a rotational direction
Implementation Method 2
the torque limiter includes a connecting plate (the plate) provided with friction members fixed to both lateral surfaces thereof
Data Source
AI summary
A damper device includes a damper unit and a torque limiter unit. The damper unit includes first and second plates each including a plurality of window portions, a hub flange including a plurality of window holes, and a stopper mechanism. The first plate includes an engaging portion and a fixing portion fixed to the second plate. The engaging portion and the fixing portion are disposed radially outside the plurality of window portions. The hub flange includes a protrusion disposed circumferentially between and radially outside adjacent two of the plurality of window holes. The stopper mechanism is configured to be actuated by contact of the protrusion with the engaging portion. A fixation member, by which the first plate and the torque limiter unit are fixed, is disposed circumferentially between adjacent two of the plurality of window portions as seen in a direction along a rotational axis.