Unified Steering Lever Brake Mechanism for Riding Mowers
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Solution Overview
Problem
Conventional riding lawn care vehicles require separate brake levers for each wheel, which can be cumbersome and inefficient, as they need to be operated independently to apply brakes, whereas the proposed solution integrates a steering lever that can rotate about a vertical axis to activate a brake assembly for both wheels, allowing for easier and unified braking control.
Innovation Solution
The integration of a steering assembly with a brake linkage assembly that allows one steering lever to activate the brake assembly for both wheels, eliminating the need for separate brake levers and enabling unified braking control by rotating the steering lever about its vertical axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate brake levers are used for each wheel, then reliable braking control is achieved, but device complexity and ease of operation deteriorate due to requiring independent operation of multiple levers
Solution Approach 1:
The patent combines multiple brake levers into a single integrated steering lever assembly. The steering lever is operably coupled to both drive wheels through a linkage mechanism, allowing one lever to control braking on both wheels simultaneously. This merging reduces the number of separate components and simplifies the overall brake system architecture while maintaining reliable braking control.
Solution Approach 2:
The steering lever serves multiple functions: it controls steering direction and simultaneously activates the brake assembly for both drive wheels. This multi-functional design eliminates the need for separate brake levers, as the same steering lever can perform both steering and braking operations, thereby reducing device complexity without compromising reliability.
2Ease of operation
If separate brake levers are used for each wheel, then precise individual wheel braking is achieved, but ease of operation worsens due to requiring independent manipulation of multiple controls
Solution Approach 1:
By merging the control function into a single steering lever, the operator only needs to manipulate one control element to apply brakes on both wheels. This consolidation dramatically improves ease of operation, as the operator no longer needs to coordinate multiple separate lever movements, thereby increasing brake application efficiency and overall productivity.
3Device complexity
If a single steering lever controls both brakes, then ease of operation and device complexity are improved, but reliability may worsen due to potential loss of individual wheel brake control
Solution Approach 1:
The patent introduces a brake linkage assembly as an intermediary mechanism between the single steering lever and the two drive wheels. This linkage system acts as a mediator that distributes the braking force from one lever to both wheels in a controlled manner, ensuring reliable and balanced braking while maintaining the simplicity of a single control element.
Data Source
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AI summary
A riding lawn care vehicle includes a frame to which at least a first and second drive wheels are attachable. The vehicle further includes a brake assembly operably coupled to the first and second drive wheels to enable brakes to be selectively applied to the first and second drive wheels. The riding lawn care vehicle also includes a steering assembly with first and second steering levera. First and second steering levers are operably coupled to first and second drive wheels respectively to facilitate turning of the riding lawn care vehicle based on drive speed control of the first and second drive wheels responsive to positioning of first and second steering levers. First and second steering levers are also operably coupled to the brake assembly to activate the brake assembly in response to one of the first or second steering levers being rotated about a vertical axis of the respective lever.