Mower Height Adjustment Linkage With Counteracting Spring Tension
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Solution Overview
Problem
The base of a mower is prone to deformation and damage due to stress concentration caused by a continuously applied spring tension, leading to operational difficulties and potential failure over time.
Innovation Solution
A mower design incorporating a second elastic member that applies a reverse tension to counteract the stress from the first elastic member, thereby balancing the forces and preventing stress concentration on the base, using a first elastic member to assist in easy operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a spring is used to assist in raising the base, then ease of operation is improved, but stress concentration and deformation of the base occur over time
Solution Approach 1:
A second elastic member is introduced as an intermediary element between the base and the connecting rod. This second elastic member applies a counteracting elastic tension in the opposite direction to the first elastic member, thereby distributing and balancing the stress on the base. The intermediary element effectively mediates the force transmission, preventing stress concentration while maintaining the assisting function for easy operation.
Solution Approach 2:
The second elastic member functions as a counterweight mechanism by applying an elastic tension in the opposite direction to the first elastic member. This counteracting force balances the stress on the base, preventing deformation while preserving the ease of operation provided by the first elastic member. The counterbalancing effect eliminates the harmful stress concentration without sacrificing the beneficial assisting function.
2Ease of operation
If a spring is continuously tensioned to assist base raising, then ease of operation is improved, but base deformation occurs after long-term use
Solution Approach 1:
The second elastic member serves as a mediator that introduces a counteracting force to balance the continuous tension from the first elastic member. By distributing the stress through this intermediary element, the base is protected from cumulative stress damage, thereby extending its service life while maintaining the ease of operation throughout the extended period.
Solution Approach 2:
The second elastic member is pre-configured to apply a counteracting elastic tension that opposes the force from the first elastic member. This preliminary anti-action prevents stress concentration before it can cause deformation, thereby extending the service life of the base while preserving the ease of operation function over the long term.
3Device complexity
If only one elastic member is used, then device complexity is reduced, but stress concentration causes base deformation
Solution Approach 1:
The second elastic member is introduced as a necessary intermediary element to prevent stress concentration. Although this increases the number of components, it is a minimal addition that strategically balances the forces acting on the base. The intermediary element provides the counteracting force needed to prevent deformation while maintaining overall system simplicity and ease of operation.
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 effectively prevents deformation and prolongs the service life of the mower base by balancing stress, ensuring consistent operation and ease of assembly.
Implementation Method 1
a first elastic member is disposed between the base and the connecting rod, which can apply a first elastic tension so that the base has a rising tendency when being in a low position
Implementation Method 2
a second elastic member is disposed between the base and at least one of the front axle and the rear axle, which can apply a second elastic tension, a stress exerted by the second elastic tension on a bottom of the base being opposite to a stress exerted by the first elastic tension to the bottom of the base
Data Source
AI summary
There is provided a mower comprising a base and a height adjustment means. The height adjustment device is a linkage comprised of a front axle, a rear axle and a connecting rod. The base is supported at a position on the front axle offset relative to the front wheel rotation axis, and is supported at a position on the rear axle offset relative to the rear wheel rotation axis. Between the base and the connecting rod is disposed a first elastic member that can apply a first elastic tension so that the base has a rising tendency when being in a low position. Between the base and at least one of the front axle and the rear axle, there is disposed a second elastic member that can apply a second elastic tension.