Robotic Lawnmower Cutting Assembly With Long-Travel Height Adjustment
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Solution Overview
Problem
Robotic lawnmowers face limitations in maximum cutting height adjustment range due to structural constraints, which complicates design, increases the need for multiple models, and compromises maneuverability and storage convenience.
Innovation Solution
A cutting assembly with a link arm arrangement and actuator arm mechanism that allows for a large travel distance in cutting height adjustment without impairing structural rigidity, featuring a linear actuator slidably received in an aperture, enabling efficient force transfer and protection against collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a cutting height adjustment mechanism with large maximum travel range is implemented, then the cutting height adjustment range is improved, but the structural integrity of the cutting assembly deteriorates
Solution Approach 1:
The cutting assembly is divided into multiple segments: a mounting unit fixed to the lawnmower body, a cutting arrangement containing the cutting unit, and a link arm arrangement connecting them. This segmentation allows each component to be optimized independently - the link arms can be designed with appropriate flexibility while maintaining overall structural integrity through the modular connection architecture.
Solution Approach 2:
The link arm arrangement incorporates pivot axes that allow dynamic movement between the mounting unit and cutting arrangement. This dynamic capability enables the cutting unit to travel through a large height range while the pivot joints absorb and distribute forces, preventing damage to the cutting assembly during operation or collision.
2Adaptability or versatility
If a cutting height adjustment mechanism with large maximum travel range is implemented, then the cutting height adjustment range is improved, but the device complexity increases
Solution Approach 1:
The link arm arrangement merges multiple functions into a single integrated mechanism: it provides structural support, enables height adjustment through pivoting, and facilitates force transfer between the mounting unit and cutting arrangement. This consolidation reduces the need for separate components and simplifies the overall design while achieving large travel range.
Solution Approach 2:
The link arms serve multiple purposes: they act as structural connectors, enable controlled movement for height adjustment, and function as force transmission elements. The pivot axes simultaneously provide rotational freedom for movement and structural rigidity for force transfer, reducing the need for additional specialized components.
3Adaptability or versatility
If a cutting height adjustment mechanism with large maximum travel range is implemented, then the cutting height adjustment range is improved, but the size of the robotic lawnmower increases
Solution Approach 1:
The cutting arrangement is positioned within or adjacent to the mounting unit, with the link arms folded or retracted when not in use. The actuator arm is slidably received in an aperture of the cutting arrangement, allowing compact storage of adjustment mechanisms within the existing lawnmower footprint, thus avoiding significant size increase.
4Adaptability or versatility
If a cutting height adjustment mechanism with large maximum travel range is implemented, then the cutting height adjustment range is improved, but the manufacturing cost increases
Solution Approach 1:
The link arms are designed with localized structural features - sufficient rigidity at connection points to mounting units and cutting arrangement, but appropriate flexibility in intermediate sections to enable movement. This differentiated quality distribution allows use of standard materials and simplifies manufacturing while achieving the required functional performance.
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
Enables a large cutting height adjustment range while maintaining structural integrity, reducing manufacturing costs, and enhancing maneuverability and storage convenience without compromising performance.
Implementation Method 1
a linear actuator configured to move the actuator arm relative to the mounting unit
Implementation Method 2
the link arm arrangement comprises a number of link arms each pivotally attached to the mounting unit and to the cutting arrangement around pivot axes
Data Source
AI summary
A cutting assembly may be configured to be mounted to a robotic lawnmower to cut vegetation. The cutting assembly includes a mounting unit configured to be mounted to a lawnmower body of the robotic lawnmower, a cutting arrangement including a cutting unit, a link arm arrangement connecting the cutting arrangement to the mounting unit, and a cutting height adjustment mechanism. The link arm arrangement includes a number of link arms each pivotally attached to the mounting unit and to the cutting arrangement around pivot axes. The cutting height adjustment mechanism includes an actuator arm slidably received in an aperture of the cutting arrangement and a linear actuator configured to move the actuator arm relative to the mounting unit.