Soft-Stop Transmission Damping Element Torque Impulse Control
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Solution Overview
Problem
Power tools face challenges in smoothly decelerating rotational components, leading to sudden torque impulses and vibrations during braking, which can cause damage and discomfort.
Innovation Solution
The implementation of a soft-stop transmission system within power tools, featuring a damping element between torque transmission components, such as a ring gear and flywheel or pulley and hub, that biases the components to maintain engagement and gradually reduce rotational velocity, thereby reducing torque impulses and vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a braking system is used to slow rotational components in power tools, then the rotational velocity is reduced, but sudden torque impulses and vibrations are generated causing damage and discomfort
Solution Approach 1:
The patent applies beforehand cushioning by positioning a damping element between the first component (ring gear or pulley) and second component (flywheel or hub) before deceleration occurs. The damping element is pre-configured to absorb and dissipate energy during the deceleration process, cushioning against the harmful torque impulses and vibrations that would otherwise be transmitted to the tool structure and user.
Solution Approach 2:
The damping element serves as an intermediary component between the torque transmission path (motor to accessory) and the rotational components. During braking, this intermediary absorbs and dissipates the harmful torque impulses and vibrations through damping mechanisms, preventing their direct transmission to the tool housing and user while still allowing controlled deceleration of the rotational components.
2Reliability
If torque is transmitted through motor and drivetrain during braking, then rotational components are slowed, but sudden deceleration causes harmful torque impulses
Solution Approach 1:
The damping element is positioned in advance within the torque transmission path to cushion against harmful torque impulses before they can cause damage. When braking occurs, the damping element absorbs and dissipates the shock loads and torque impulses generated during deceleration, protecting the motor, drivetrain, and tool structure from damage while maintaining reliable braking control.
3Loss of time
If rotational components decelerate suddenly, then braking is achieved, but vibrations are generated causing user discomfort
Solution Approach 1:
The damping element is pre-positioned in the torque transmission path to cushion against vibrations during deceleration. When braking occurs, the damping element absorbs and dissipates vibrational energy through damping mechanisms, reducing the transmission of vibrations to the tool housing and user while maintaining effective braking over an appropriate time period.
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 soft-stop transmission system enables a controlled, gentle deceleration of rotational components, reducing vibrations and torque impulses, thereby enhancing tool durability and user experience.
Implementation Method 1
a damping element positioned between the first component and second component. The damping element is configured to bias the first component in the first rotational direction and the second component in an opposite, second rotational direction
Data Source
AI summary
A power tool includes a soft-stop transmission having a first component and a second component. The first component is configured to receive torque from a motor to rotate the first component in a first rotational direction. The second component is connected to an output of the power tool and is configured to rotate in a first rotational direction in unison with the first component. The second component is configured to rotate in the first rotational direction relative to the first component in response to angular deceleration of the first component. A damping element is positioned between the first component and second component, and the damping element is configured to bias the first component in the first rotational direction and the second component in an opposite, second rotational direction.