Cam Wheel Deck Height Adjustment Mechanism
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Solution Overview
Problem
There is a need for a deck height adjustment mechanism in riding mowers that can be easily and accurately operated by the operator without shutting down the mower or dismounting, allowing for quick and precise adjustments to the mowing height.
Innovation Solution
A deck height adjusting apparatus featuring a cam wheel with a central spindle, a secondary arm, and a rod that contacts the cam wheel's edge surface, enabling the operator to raise and lower the mowing deck using a lever-actuated lift system, allowing for precise height adjustments while seated on the mower.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional deck height adjustment mechanism is used, then the structure is simple, but the operator cannot adjust the deck height easily while seated on the mower
Solution Approach 1:
The adjustment mechanism is repositioned from a ground-level or deck-mounted location to the operator seating area, changing the spatial dimension of operation. The cam wheel and rod assembly are integrated into the operator's reach zone, allowing height adjustment while seated without requiring the operator to dismount or reach awkward positions.
Solution Approach 2:
A cam wheel acts as an intermediary mechanism between the operator's manual input and the deck lifting system. The cam wheel converts rotational motion into linear displacement of the rod, which then actuates the lift arms, providing a mechanical advantage and precise control intermediate step.
2Productivity
If the operator dismounts to adjust deck height, then accurate adjustment is possible, but time is lost and operational efficiency decreases
Solution Approach 1:
The system enables the operator to perform deck height adjustment as a self-service operation while remaining seated on the mower. The control mechanism is positioned within easy reach of the operator's hand or foot, allowing continuous operation without interruption or dismounting.
Solution Approach 2:
The cam wheel mechanism allows the operator to make preliminary height adjustments quickly while moving between mowing areas, without requiring complete stops or dismounting. This maintains momentum and operational flow while achieving the necessary precision.
3Ease of operation
If the mower motor is shut down for adjustment, then safety is improved, but operational continuity is interrupted
Solution Approach 1:
The deck height adjustment function is extracted from the motor control system and made independent. The cam wheel and rod mechanism operate mechanically without requiring motor power or electrical systems, allowing adjustment to be performed while the mower is running without affecting motor operation or safety interlocks.
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 quick, easy, and accurate adjustment of the mowing deck height without shutting down the mower, enhancing operational efficiency and convenience for the operator.
Implementation Method 1
A cam wheel having a central spindle is rotationally mounted to the frame adjacent to the operator seating area. The cam wheel has first and second side surfaces and an edge surface. The edge surface is oriented in a common plane with the secondary arm. A rod has a first end pivotally attached to the secondary arm and a second end opposite the first end. The second end of the rod contacts the edge surface of the cam wheel when the secondary arm is in a first position.
Data Source
AI summary
A riding mower with a height adjustable mowing deck includes an operator seating area and a cam wheel rotatably connected to a frame of the mower adjacent to the operator seating area. The mowing deck is supported below the frame of the mower by a deck lifting system comprising a plurality of cooperating bell cranks pivotally connected at various locations to the frame. One of the bell cranks is connected for common rotation to a secondary arm aligned in a common plane with the cam wheel. A rod pivotally connects at one end to the secondary arm. The opposite end of the arm contacts an edge portion of the cam wheel. A selector wheel associated with the cam wheel, for adjusting the cam wheel edge in contact with the rod, has a scalloped perimeter edge. A detent engages the scalloped edge to maintain a selected position of the cam wheel.