Angular Damping Device Friction Pads Speed-Dependent Clamping
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Solution Overview
Problem
Angular damping devices in motor vehicle temporary wet coupling systems experience resonance issues due to varying rotation speed and torque, leading to ineffective vibration attenuation at high speeds.
Innovation Solution
The damping device incorporates friction pads with retaining faces angled between 1° and 89° relative to the radial direction, allowing a dynamic clamping force to be applied due to centrifugal force, which increases with rotation speed, and features ramps on guide washers to adjust static clamping force based on torque, enhancing vibration reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional friction pads are used without dynamic clamping, then the structure is simple, but vibration attenuation is ineffective at high speeds
Solution Approach 1:
The friction pad structure is made dynamic by introducing a dynamic clamping force that varies with rotation speed. The retaining face is angled relative to the radial direction, allowing centrifugal force to generate an axial component that increases clamping force at high speeds while maintaining simplicity at low speeds.
Solution Approach 2:
The clamping force parameter is changed dynamically through the angled retaining face design. As rotation speed changes, the axial component of centrifugal force changes, automatically adjusting the clamping force between the friction pad and guide washer to optimize vibration attenuation across different operating conditions.
2Reliability
If static clamping force is increased to improve damping, then low-speed performance improves, but high-speed resonance issues persist
Solution Approach 1:
The clamping force transitions from static to dynamic, automatically adapting to rotation speed. At low speeds, static clamping provides adequate damping; at high speeds, the dynamic component from centrifugal force increases clamping force to suppress resonance, eliminating the need for excessive static preloading.
3Reliability
If friction pads are designed with angled retaining faces, then dynamic clamping force increases with speed, but manufacturing precision requirements increase
Solution Approach 1:
The retaining face angle is optimized to balance manufacturing feasibility with performance. The angle creates sufficient axial component from centrifugal force to generate effective dynamic clamping while remaining within reasonable manufacturing tolerances for standard machining processes.
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 solution effectively attenuates vibrations at high speeds without compromising low-speed performance, providing efficient damping across a range of rotation speeds and torque levels without additional components.
Implementation Method 1
each friction pad comprises at least one retaining face of at least one of the elastic members against the action of centrifugal force
Implementation Method 2
the elastic member being partially inserted between the two retaining faces in the manner of a wedge, so that the axial component of the centrifugal force exerted on each retaining face by the elastic member clamps each friction pad against the associated guide washer
Implementation Method 3
the friction pads; can be axially pressed towards each of the two radial guide washers by application of an axial clamping force so that they are axially clamped against each of the guide washers
Implementation Method 4
at least two elastic members with circumferential action which are circumferentially interposed in series between the web and the guide washers
Data Source
AI summary
An angular damping device (10) for a motor vehicle temporary wet coupling system comprises two radial guide washers (24) which are positioned axially one on each side of a web (12),at least two elastic members (38) with circumferential action which are circumferentially interposed in series between the web (12) and the guide washers (24), and a phase member (42) which comprises at least one radial phase lug (48). The phase member (42) further comprises two friction pads which can parted axially against each of the guide washers (24). Each of the friction pads comprises a retaining face (54) for retaining an elastic member (38) against the action of centrifugal force. The elastic member (38) is partially inserted between the two retaining faces (54)in the manner of a wedge.