Axially Nested Damper Torque Limiter for Compact Radial Packaging
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Solution Overview
Problem
Existing damper devices with torque limiters suffer from increased radial dimensions, hindering compactness and efficiency in applications such as hybrid vehicles.
Innovation Solution
The damper device incorporates a damper unit with first and second plates, a hub flange, elastic members, and a stopper mechanism, coupled with a torque limiter unit that includes an annular plate fixed to the damper unit, preventing excessive torque transmission while maintaining compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a torque limiter is disposed on the outer peripheral side of the damper part, then torque transmission can be limited, but the radial dimension of the device increases
Solution Approach 1:
The patent repositions the torque limiter from a radial arrangement (outer peripheral side) to an axial arrangement (between the first and second plates). This dimensional change allows the torque limiter to function effectively while maintaining a compact radial profile, thus resolving the contradiction between torque limitation capability and radial size.
Solution Approach 2:
The torque limiter is nested within the axial space between the first and second plates of the damper part. By utilizing the existing axial gap, the torque limiter is integrated into the structure without requiring additional radial space, achieving both torque limitation and compactness.
2Strength
If the annular plate is fixed at positions overlapping window portions, then structural integrity is maintained, but radial dimension increases
Solution Approach 1:
The patent specifies that the fixation members should be positioned in regions that do not overlap with the window portions,而是 in the circumferential spaces between them. This local differentiation allows the annular plate to be securely fixed while maintaining the functional integrity of the window portions and avoiding radial dimension increase.
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 torque transmission between the power source and output sides, preventing excessive torque in hybrid vehicles while inhibiting radial dimension increase, thus achieving compactness and efficiency.
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
a pair of plates and a plurality of torsion springs
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.