Damper Lug Notch Assembly Angular Movement
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Solution Overview
Problem
The staking operation used to attach a pre-damper to a hub in damper manufacturing often results in misalignment, and the rigid connection between the main damper and hub complicates assembly, preventing angular movement and leading to increased gap requirements for free spinning.
Innovation Solution
A clutch assembly design where a lug on the pre-damper is received into a notch on the main damper, allowing limited axial and radial movement to prevent relative rotation while enabling a degree of angular movement, thereby reducing the gap between the hub splines and clutch plates, allowing the damper assembly to spin freely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid connection is used between the main damper and hub, then relative rotation is prevented, but angular movement is restricted and gap requirements increase
Solution Approach 1:
The connection between the pre-damper and main damper is changed from rigid to dynamic through the lug and notch mechanism. The lug fits into the notch with clearance, allowing the pre-damper to accommodate angular movements and misalignments while maintaining connection stability. This dynamic connection enables limited relative movement between components.
Solution Approach 2:
The design incorporates clearance parameters in the lug-notch interface, transforming the connection from zero-clearance rigid coupling to controlled-clearance flexible coupling. This parameter change allows angular movement while maintaining reliable connection through the engagement geometry of the lug and notch.
2Ease of manufacture
If staking operation is used to attach pre-damper to hub, then assembly is simplified, but misalignment occurs and precision deteriorates
Solution Approach 1:
The lug-notch interface is designed with built-in clearance to compensate for misalignment that occurs during staking assembly. The clearance acts as a cushion that absorbs the misalignment errors, allowing the pre-damper to be attached via simple staking operation while maintaining acceptable alignment through the tolerant interface geometry.
Solution Approach 2:
The lug and notch are designed with asymmetric engagement geometry where the lug fits into the notch with intentional clearance. This asymmetric fit provides directional tolerance that accommodates staking-induced misalignment while maintaining functional connection, resolving the conflict between simple assembly and alignment precision.
3Productivity
If multiple components are assembled in the same operation, then productivity is reduced, but assembly complexity increases
Solution Approach 1:
The damper assembly is segmented into distinct components (main damper, pre-damper, lug, notch) that can be assembled in separate operations. The lug-notch interface serves as a modular connection point that allows sequential assembly without requiring complex simultaneous operations, thereby maintaining productivity while managing complexity through modular construction.
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 design addresses misalignment issues and simplifies assembly by allowing limited angular movement, reducing the gap between the hub splines and clutch plates, enabling smoother operation and reducing assembly complexity.
Implementation Method 1
The lug is received in the notch defined by the first side plate of the damper to prevent relative rotation between the first side plate of the damper and the pre-damper
Implementation Method 2
The first and second side plates and the friction plates are operatively connected by a plurality of damper springs for damping between the first and second side plates and the friction plates
Implementation Method 3
a plurality of damper springs for damping between the first and second side plates and the friction plates
Implementation Method 4
The pre-damper has an intermediate plate and first and second pre-damper side plates disposed on opposite axial sides of the intermediate plate that are operatively connected by a plurality of pre-damper springs
Implementation Method 5
a plurality of pre-damper springs that operatively connect the first and second pre-damper side plates to the intermediate plate
Data Source
Figure 1~2
Figure 3
AI summary
A clutch assembly is disclosed that includes a hub, a damper and a pre-damper. A first pre-damper side plate is adjacent the damper and a second pre-damper side plate has a lug that extends radially outwardly and axially across the intermediate plate and the first pre-damper plate toward a first side plate of the damper that is adjacent the pre-damper. The lug is received in a notch defined by the first side plate of the damper to prevent relative rotation between the first side plate of the damper and the pre-damper. A method is disclosed for assembling the pre-damper and the damper on a hub. The pre-damper includes a radially and axially extending lug that is assembled to the notch in the damper to prevent relative rotation between the damper and the pre-damper.