Lawn Mower Deck Height Linkage for Parallel Ground Tracking
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Solution Overview
Problem
Existing riding lawn mowers have a limited adjustable range for mowing height and poor parallelism between the chassis of the mowing tray and the ground, leading to uneven mowing on terrains with varying levels.
Innovation Solution
A height adjusting mechanism comprising a connecting rod, height-adjusting support plate assembly, and adjusting handle assembly, forming a parallelogram structure to maintain parallelism between the mowing tray chassis and the ground, with a wide range of height adjustment through a 13-gear system and a height-mowing force adjusting tension spring for ease of operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional height adjustment mechanism is used, then the structure is simple, but the adjustable range of mowing height is limited and parallelism between chassis and ground is poor
Solution Approach 1:
The height adjustment mechanism is divided into multiple independent components: connecting rod, height-adjusting support plate assembly, adjusting handle assembly, and height-mowing adjusting bracket. Each component performs a specific function, allowing independent optimization and expansion of adjustment range without proportionally increasing overall system complexity.
Solution Approach 2:
The mechanism transitions from simple vertical height adjustment to multi-dimensional adjustment by introducing the parallelogram structure that maintains horizontal parallelism while adjusting vertical height. This adds a dimensional aspect to the adjustment capability, enabling both height variation and parallelism maintenance simultaneously.
2Manufacturing precision
If a conventional height adjustment mechanism is used, then the structure is simple, but parallelism between chassis and ground is poor resulting in uneven mowing
Solution Approach 1:
The parallelogram mechanism utilizes geometric curvature and shape properties to maintain parallelism. The four-bar linkage with equal opposite sides creates a rigid parallelogram structure that inherently maintains parallel orientations during motion, ensuring the chassis remains parallel to the ground throughout the adjustment range.
Solution Approach 2:
The connecting rod and height-adjusting support plate assembly act as intermediary elements between the fixed frame and the mowing tray. These intermediaries transmit and transform the adjustment motion while maintaining the parallel relationship, serving as mediators that preserve geometric constraints during the adjustment process.
3Adaptability or versatility
If a wide range height adjustment is implemented, then adaptability to various terrains is improved, but the adjusting force required increases
Solution Approach 1:
The tension spring in the height-mowing adjusting bracket acts as a counterbalancing force that opposes the weight of the mowing tray assembly. This spring mechanism provides a counterweight effect, reducing the net force required by the user to adjust the height, especially when moving against gravity during the adjustment process.
Solution Approach 2:
The tension spring provides self-service by automatically assisting the adjustment process. As the adjusting handle moves, the spring expands or compresses to provide opposing force that reduces the user's effort. The system uses its own components (the spring) to serve the function of reducing adjusting force without external assistance.
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
Ensures even mowing by maintaining parallelism between the mowing tray chassis and the ground, providing a wide range of height adjustment and reducing the required adjusting force, suitable for various terrains and user preferences.
Implementation Method 1
the connecting rod and the height-adjusting support plate assembly form a parallelogram mechanism in space, so that when the height of the mowing tray assembly is adjusted, the surface of a chassis of the mowing tray is always parallel to the ground
Implementation Method 2
a height-mowing force adjusting tension spring for ease of operation
Data Source
AI summary
A height adjusting mechanism and a lawn mower containing the same, relates to the technical field of lawn mowers, and solves the technical problems of poor parallelism between a chassis of a mowing tray and the ground and uneven mowing. The height adjusting mechanism includes a connecting rod, a height-adjusting support plate assembly, an adjusting handle assembly and a height-mowing adjusting bracket, wherein the connecting rod and the height-adjusting support plate assembly are rotatably connected between a mowing tray assembly and a frame assembly, so that the mowing tray assembly is suspended on the frame assembly; the height-mowing adjusting bracket is provided between the adjusting handle assembly and the height-adjusting support plate assembly; and the connecting rod and the height-adjusting support plate assembly form a parallelogram mechanism in space, so that when the height of the mowing tray assembly is adjusted, the surface of the chassis of the mowing tray is always parallel to the ground.