Lawnmower Height Adjustment Mechanism to Suppress Support Rattling
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Solution Overview
Problem
Conventional lawnmower height adjusting mechanisms are unstable due to fluctuations in load and vibrations, leading to uneven cutting heights and suboptimal grass cutting quality.
Innovation Solution
A vertically adjustable work machine with a ring member and support member engaged via a screw thread mechanism, combined with elastic members to prevent rattling and ensure stable height adjustment, allowing for precise and reliable height adjustments using an electric motor for power-driven operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a height adjusting mechanism is provided with a support member and guide member, then the cutting blade height can be adjusted, but the support member rattles relative to the guide member due to load fluctuations and vibrations
Solution Approach 1:
A rubber buffer is introduced between the support member and guide member to cushion vibrations and load fluctuations before they can cause rattling. This elastic element absorbs shock and dampens oscillations, preventing the support member from rattling relative to the guide member during operation.
Solution Approach 2:
The rubber buffer acts as an intermediary element between the support member and guide member. This intermediate component transfers loads and vibrations in a controlled manner, preventing direct contact and rattling while still allowing the necessary height adjustment motion to occur.
2Ease of operation
If the support member is allowed to move freely for height adjustment, then ease of adjustment is improved, but the cutting height becomes uneven due to inadvertent dropping
Solution Approach 1:
The rubber buffer provides beforehand cushioning by absorbing sudden drops and vibrations before they can cause the support member to inadvertently drop. This elastic cushioning action maintains cutting height consistency while still allowing intentional height adjustments to be made easily.
3Stability of the object's composition
If a rigid connection is used between support member and guide member, then stability is improved, but the ability to absorb vibrations and load fluctuations is reduced
Solution Approach 1:
The connection between the support member and guide member is changed from rigid to elastic by introducing the rubber buffer. This parameter change allows the connection to be stable during normal operation while simultaneously absorbing vibrations and load fluctuations through the elastic deformation of the rubber material.
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 stable and precise height adjustment mechanism that minimizes rattling and ensures consistent cutting height, improving grass cutting performance and durability by converting rotational motion into vertical movement with minimal friction and maintaining desired mowing heights.
Implementation Method 1
a first elastic member (86) provided on the machine main body and resiliently and slidably abutting against the adjusting drive member to urge the adjusting drive member in a downward direction
Implementation Method 2
A screw thread mechanism is formed between the inner circumferential surface of the guide member and the outer circumferential surface of the support member so that the height of the support member along with the cutting blade may be vertically adjusted by turning the support member relative to the guide member around the central axis thereof
Data Source
AI summary
A work machine (10) such as a lawnmower provided with a high adjusting mechanism comprises a machine main body (12), an guide member (50) provided on the machine main body so as to be rotatable around a vertical axis, a support member (60) engaged by the guide member via a converting mechanism that converts a rotational motion of the guide member into a vertical motion of the support member, a work unit (18) supported by the support member, and a sheet spring (86) provided on the machine main body and resiliently and slidably abutting against the adjusting driven member to urge the adjusting driven member in a downward direction.