Elastic Thread Section for Vibration Damping in Lawnmower Height Adjustment
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Solution Overview
Problem
Autonomous lawnmowers face noise and vibration issues due to imbalances in cutting tools and transmission of vibrations to the chassis, leading to increased noise emissions and potential damage to components.
Innovation Solution
The implementation of an elastically displaceable thread section in the height adjustment device, which includes threads with varying tooth widths and flank offsets, reduces axial play between threads, allowing for reduced-play relative rotation and damping of vibrations, thereby minimizing noise and vibration transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If rigid threads are used in the height adjustment device, then manufacturing precision is improved, but vibration transmission and noise increase
Solution Approach 1:
The patent changes the physical state of the thread section by making it elastically displaceable rather than rigid. This allows the thread to maintain precise engagement while absorbing vibrations through elastic deformation, thereby reducing noise transmission without sacrificing manufacturing precision
Solution Approach 2:
The patent applies a flexible element to the thread section, allowing it to deform elastically under vibrational loads. This flexible thread section maintains the necessary mechanical engagement while isolating vibrations from the chassis, resolving the contradiction between precision and vibration transmission
2Measurement precision
If play-free thread engagement is achieved, then positioning accuracy is improved, but noise from vibration transmission increases
Solution Approach 1:
The patent transforms the thread section into an elastic element that can dynamically adjust its engagement parameters. During operation, the elastic thread maintains consistent contact pressure for accurate positioning while absorbing vibrational energy, thereby reducing noise emissions without compromising positioning accuracy
3Stability of the object's composition
If rigid connection between cutting device and chassis is used, then structural stability is improved, but vibration and noise transmission to chassis increases
Solution Approach 1:
The patent introduces an elastic thread section as an intermediary element between the cutting device and chassis. This intermediary maintains the necessary mechanical connection for structural stability while absorbing and dampening vibrations, preventing their transmission to the chassis and reducing noise
Solution Approach 2:
The elastic thread section acts as a flexible connector that maintains structural integrity through consistent engagement while isolating vibrations. The flexible nature of the thread allows it to deform under vibrational loads, protecting the chassis from noise and vibration transmission
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 reduces noise emissions and vibration transmission, enhancing the operational quietness and reducing wear on components, allowing for more efficient and user-friendly operation of autonomous lawnmowers.
Implementation Method 1
at least one of the threads has at least two thread sections, wherein the one thread section, in particular an elastically displaceable thread section, preferably a thread section which is elastically displaceable radially in relation to the thread axis
Implementation Method 2
a thread section which is elastically displaceable radially in relation to the thread axis
Data Source
AI summary
The disclosure proceeds from an autonomous lawnmower having a chassis, a motor for driving a cutting device, and a height adjustment device for a displacement of the cutting device and of the motor relative to the chassis, at least for setting a working height of the cutting device relative to the chassis, in particular for setting a cutting height of a cutting tool of the cutting device, wherein the height adjustment device has a hollow cylindrical rotary body and a sliding seat surrounding the rotary body, which rotary body and sliding seat have corresponding threads such that a rotation of the rotary body results in a linear displacement of the sliding seat.One of the threads has at least two thread sections, wherein the one thread section is elastically displaceable radially in relation to the thread axis.