Front Caster Wheel Braking System for Zero-Turn Mowers
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Solution Overview
Problem
Self-propelled vehicles with front caster wheels lack a braking system, leading to inadequate stopping performance and increased risk of accidents, as existing braking systems rely solely on rear wheels, which is insufficient for enhanced control and safety, especially in zero-turn mowers.
Innovation Solution
A front braking system is introduced for self-propelled vehicles, utilizing a manual actuator connected to a brake assembly that allows for the selective braking of front caster wheels through hydraulic, pneumatic, or electrical means, ensuring the wheels can rotate freely without twisting connecting wires or hoses, thereby preventing damage and enabling effective braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a braking system is added to front caster wheels, then stopping ability is greatly enhanced, but the complexity of the device increases due to additional components and connections
Solution Approach 1:
The patent replaces complex mechanical linkage systems with a hydraulic braking system. The hydraulic master cylinder and slave cylinders provide braking force through fluid pressure transmission, eliminating the need for complex mechanical linkages while achieving reliable braking on caster wheels. This substitution maintains stopping ability while reducing mechanical complexity.
Solution Approach 2:
The hydraulic system serves multiple functions: it provides braking force to the caster wheels, accommodates the 360-degree rotation requirement through flexible hoses, and integrates with the existing vehicle braking infrastructure. This multi-functionality approach resolves the contradiction by using a single system type for both rotation freedom and braking effectiveness.
2Reliability
If wires, hoses or linkages are connected to brake devices on caster wheels, then braking function is achieved, but the free rotation of caster wheels is restricted and the wires/hoses may be damaged
Solution Approach 1:
The patent employs flexible hydraulic hoses to connect the braking system components on the rotating caster wheels. These flexible hoses can accommodate the 360-degree rotation without twisting or damaging the fluid passage, maintaining both braking function and free rotation capability. The flexibility of the hoses resolves the contradiction between having a connected braking system and allowing unrestricted wheel rotation.
Solution Approach 2:
The hydraulic fluid acts as an intermediary medium to transmit braking force from the master cylinder to the slave cylinders on the rotating wheels. This fluid-mediated force transmission allows the braking system to function without requiring rigid mechanical linkages that would restrict rotation, thereby maintaining both braking reliability and rotation freedom.
3Device complexity
If rear wheels alone are used for braking, then the vehicle structure remains simple, but stopping performance is insufficient and safety is compromised
Solution Approach 1:
The patent segments the braking function across all four wheels rather than concentrating it solely on the rear wheels. By adding braking capability to the front caster wheels through the hydraulic system, the stopping load is distributed more effectively, improving overall stopping performance while maintaining relatively simple vehicle structure through the use of standardized hydraulic components.
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 implementation of a front braking system enhances the stopping ability of self-propelled vehicles, particularly zero-turn mowers, reducing the risk of accidents and improving operator control by distributing braking power more evenly across all wheels, thus enhancing safety.
Implementation Method 1
a hydraulic master cylinder and at least two hydraulic slave cylinders, each connected to the frame by a respective hydraulic hose
Implementation Method 2
The first and second mechanisms may be pneumatic, instead of hydraulic
Implementation Method 3
The first and second mechanisms may be electrical, instead of hydraulic or pneumatic
Implementation Method 4
A second mechanism is connected to the caster wheel assembly to slow or stop rotation of the caster wheel about its axle
Data Source
AI summary
A ride-on, self-propelled vehicle having front caster wheels, such as a zero-turn mower, includes a front brake system. The actuating power for the front brake pass through a spindle supporting the front caster wheel. In a preferred embodiment, a center shaft of each spindle or a concentric outer ring of a sleeve of each spindle passes a force from a brake actuator to a brake for the respective caster wheel. Actuation of the brake actuator moves a member into frictional contact with a portion of the front wheel or an object attached to the front wheel to applying a braking force.