Friction Pad Clutch Assembly for Noiseless One-Way Torque Transmission
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Solution Overview
Problem
Existing one-way clutch mechanisms, such as ratchet mechanisms in freewheels, generate noise and waste energy due to constant pawl engagement, and noiseless solutions often increase complexity and cost with additional materials or high friction.
Innovation Solution
A noiseless one-way clutch assembly using a cylindrical driving member with cam-profile indentations and a radially movable clutch cylinder, employing friction pads for engagement and disengagement, reduces noise and energy loss by allowing limited slip during transition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ratchet mechanism with pawls and ratchet teeth is used, then one-way clutch function is achieved, but noise and energy loss occur due to constant pawl engagement and chatter
Solution Approach 1:
The patent replaces the traditional mechanical ratchet-pawl engagement system with a friction-based clutch mechanism. The friction pads press against the driving member to transmit torque, eliminating the chatter and noise inherent in ratchet-to-pawl mechanical engagement while maintaining the one-way clutch function.
Solution Approach 2:
The patent introduces friction pads as an intermediary element between the driving member and driven member. These pads provide a smooth friction-based torque transmission mechanism, replacing the direct rigid mechanical contact of ratchet teeth and pawls, thereby reducing noise and energy loss.
2Object-generated harmful factors
If additional materials and mechanisms are added to control pawl position for noiseless operation, then noise is reduced, but device complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the complex pawl-spring-ratchet mechanism entirely, replacing it with a simpler friction-based system. By removing the need for separate pawl positioning mechanisms and additional controlling materials, the design achieves noiseless operation with reduced complexity.
Solution Approach 2:
The patent changes the fundamental operating parameter from mechanical engagement (ratchet teeth and pawls) to friction-based engagement (friction pads pressing against the driving member). This parameter change enables noiseless operation while simplifying the overall mechanism.
3Object-generated harmful factors
If roller or sprag clutches are used for noiseless operation, then noise is reduced, but friction and wear increase due to constant contact
Solution Approach 1:
The patent implements a dynamic engagement system where friction pads are actuated only when torque transmission is required. The release member allows the friction pads to disengage from the driving member during free-wheel operation, creating a dynamic on-demand engagement system rather than constant contact, thereby reducing friction and wear.
Solution Approach 2:
The friction pads engage and disengage periodically based on the direction of torque application. During forward torque transmission, the pads are pressed against the driving member; during reverse or free-wheel operation, they disengage. This periodic engagement pattern reduces continuous friction and wear compared to constant-contact clutches.
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 solution provides a noiseless, low-complexity one-way clutch mechanism with reduced wear and energy loss, enhancing serviceability and operational smoothness.
Implementation Method 1
the engaging causing means includes a friction pad between the driving member and the driven member
Data Source
AI summary
A clutch assembly comprises a cylindrical driving member, a cylindrical driven member, coaxial with the cylindrical driving member, and a clutch cylinder between the driving member and the driven member and coaxial with the driving member and the driven member. The clutch assembly further includes a spring biasing the clutch cylinder towards the clutch cylinder. The clutch assembly also includes a plurality of friction pads, each one being attached to a different one of movable portions, and acting in response to movement of its movable portion, to cause frictional engagement between the driving member and the driven member, so that the driving member rotates the driven member. The clutch assembly also includes a U-shaped spring located in a slot in the driving member and compressible between the driving member and the clutch cylinder for rotationally biasing the clutch cylinder relative to the driving member in a clutch engagement direction.