Vibration Damping Handle Torque Transmission
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Solution Overview
Problem
Existing vibration-reducing handles for power tools, such as angle grinders and hammer drills, face issues with torque transmission and vibration isolation, where the handle can twist relative to the tool when maximum torque is exceeded, leading to inefficient vibration reduction and handling.
Innovation Solution
The handle features a carrier element with radial outer profile elevations and an inner profile with corresponding recesses, creating a toothing effect that enhances torque transmission while maintaining vibration isolation through a vibration-reducing body and collar design, which includes foamed plastic materials for adjustable prestress and effective decoupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a cylindrical outer sleeve is used with a simple screw connection to the carrier element, then the structure is simple and easy to manufacture, but the torque transmission is limited and the connection can twist when maximum torque is exceeded
Solution Approach 1:
The cylindrical outer sleeve is segmented into multiple axial sections, each with its own profile elevation structure. This segmentation allows the torque transmission function to be distributed across multiple engagement points along the axial direction, increasing the overall torque transmission capacity while maintaining the simplicity of the cylindrical base structure.
Solution Approach 2:
The invention adds a radial dimension to the torque transmission by creating profile elevations that extend radially outward from the cylindrical surface. This dimensional change creates multiple engagement surfaces that work together to transmit torque, transforming a single-surface cylindrical connection into a multi-surface engaged connection with higher torque capacity.
2Strength
If the outer sleeve is held close to the carrier element for secure connection, then torque transmission is improved, but vibration transmission increases and handling comfort decreases
Solution Approach 1:
A vibration-reducing element is introduced as an intermediary component between the outer sleeve and the carrier element. This intermediary maintains the necessary radial distance to reduce vibration transmission while allowing the profile elevations to engage and transmit torque effectively. The vibration-reducing element acts as a mediator that decouples the vibration path while preserving the torque transmission path.
Solution Approach 2:
The vibration-reducing element is designed as a flexible component that can accommodate the engagement between profile elevations while maintaining a consistent radial distance. This flexible structure allows for effective vibration isolation through its elastic properties while still enabling the mechanical engagement needed for torque transmission.
3Strength
If profile elevations are added to both outer sleeve and carrier element to create toothing effect, then torque transmission is improved, but device complexity increases
Solution Approach 1:
Instead of making the entire outer sleeve and carrier element complex, the profile elevations are applied locally at specific axial positions where torque transmission is needed. This localized application of the toothing effect creates the necessary engagement points without requiring complex structures along the entire length of the components, thus balancing torque transmission capability with manufacturing simplicity.
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 allows for improved torque transmission and reduced vibration transmission, enabling secure handling and easy assembly/disassembly of the handle, while maintaining effective vibration reduction during tool operation.
Implementation Method 1
the handle has an elastic vibration-reducing device which encloses the carrier element and via which the outer sleeve is held at a radial distance from the carrier element
Implementation Method 2
The vibration reduction device has an isolating or dampening effect, which ensures that vibrations occurring on the power tool during operation are transmitted to the outer sleeve only to a greatly reduced extent
Implementation Method 3
a toothing acting on both radial sides of the vibration reduction device is achieved, which leads to a clearly improved transmission of torque from the outer sleeve to the carrier element
Data Source
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AI summary
A handle (2) of a hand tool (4) comprises an outer sleeve (10) accessible to a user, a support element (22) extending at least partially within the outer sleeve (10) along a longitudinal axis (A), rotary fastening means (6) that are at least partially rotatably coupled to the support element (22) and by means of which the handle (2) can be fixed to or detached from the hand tool (4), and an elastic vibration damping device (24) enclosing the support element (22), by means of which the outer sleeve (10) is held radially spaced from the support element (22). The support element (22) is provided to have an outer profile (36) with radial outer profile extensions (38) that are arranged at the axial height of the vibration damping device (24) with a gap to radial inner profile extensions (44) of an inner profile (50) of the outer sleeve (10).