Diaphragm Spring Pendulum Assembly for Lower Contact Wear
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Solution Overview
Problem
Existing centrifugal pendulum devices suffer from complex manufacturing of spring washers that unevenly distribute contact force, leading to increased wear on contact elements due to high local surface pressure.
Innovation Solution
Designing the spring washer as a disc spring with multiple spring tongues to evenly distribute contact pressure and reduce surface pressure, ensuring a compact and durable centrifugal pendulum device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring washer is used to preload the contact element, then the contact element is pressed against the pendulum mass to generate frictional resistance, but the spring washer creates high local surface pressure on the contact element leading to increased wear
Solution Approach 1:
The spring washer is segmented into multiple spring tongues (at least three) that are distributed around the circumference. Each spring tongue applies force to the contact element at a different location, dividing the total preload force into multiple smaller contact points. This segmentation prevents concentration of force at a single location, thereby reducing local surface pressure and wear on the contact element.
Solution Approach 2:
The spring tongues are designed with specific geometric characteristics (width, length, curvature) that are optimized for their local function of distributing force. The varying dimensions of different spring tongues allow for tailored force distribution across different regions of the contact element, ensuring uniform pressure distribution and preventing localized high-stress areas that would cause wear.
2Device complexity
If a spring washer with single force application tongue is used, then the structure is simpler, but the contact force is distributed unevenly across the circumference resulting in high local surface pressure
Solution Approach 1:
The spring washer is divided into multiple spring tongues arranged circumferentially, transforming a single-point force application into multi-point force application. This segmentation inherently improves the uniformity of contact force distribution across the contact element without requiring complex external mechanisms, as the radial arrangement of tongues naturally distributes force evenly around the circumference.
Solution Approach 2:
Multiple spring tongues are merged into a single integrated spring washer component rather than using separate springs. This merging maintains structural simplicity while achieving uniform force distribution through the geometric arrangement of the tongues, combining the benefits of simplicity with improved force distribution uniformity.
3Reliability
If multiple spring tongues are used to distribute contact pressure evenly, then wear on contact element is reduced, but the spring washer becomes more complex to manufacture
Solution Approach 1:
The spring washer geometry is optimized by varying parameters such as tongue width, length, and curvature to achieve uniform force distribution. By carefully selecting these geometric parameters, the spring washer can be manufactured as a single piece with standard spring manufacturing processes, balancing manufacturing ease with improved durability through even force distribution.
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 disc spring design provides consistent frictional resistance, reduces wear, and minimizes installation space while maintaining durability by evenly distributing force across the contact element.
Implementation Method 1
a spring washer preloading the contact element in an axial direction of the axis of rotation towards the pendulum mass... the spring washer is designed as a disc spring equipped with several spring tongues
Implementation Method 2
a contact element lying on the pendulum mass, which contact element is used (directly or indirectly) to generate a frictional resistance inhibiting a relative movement between the pendulum mass and the carrier
Data Source
Figure 1~2
Figure 3
Figure 4~6
AI summary
The invention relates to a centrifugal pendulum device (1) for a powertrain of a motor vehicle, comprising: a support (3) which is rotatable about an axis of rotation (2); a pendulum mass (5), which is received on the support (3) so as be able to swing along a guide path (4), a restoring movement directed oppositely to an engine irregularity being produced by the pendulum mass (5) during operation; a contact element (6) bearing against the pendulum mass (5), which contact element (6) is used to produce a frictional resistance that prevents relative motion between the pendulum mass (5) and the support (3); and a spring washer (7), which preloads the contact element (6) towards the pendulum mass (5) in an axial direction of the axis of rotation (2), the spring washer (7) being formed as a diaphragm spring (7) equipped with a plurality of spring tongues (8). The invention additionally relates to a clutch plate (20) for a friction clutch of a motor vehicle comprising said centrifugal pendulum device (1), and to a powertrain for a motor vehicle, likewise comprising said centrifugal pendulum device (1).