Rear Axle Locking Mechanism for Narrow Road Sweeper Stability
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Solution Overview
Problem
Existing narrow road sweeping vehicles face stability issues at high speeds due to their compact design and high center of gravity, limiting their ability to maintain stability and safety when driving on roads at speeds above 25 km/hour.
Innovation Solution
A self-propelled road cleaning vehicle with a mechanical axle locking device and advanced suspension system, featuring a mechanical interface with a pivoting lower plate and fixed upper plate, and a spring-loaded blocking jack for rear axle locking, along with a reactive electronic servo system for four-wheel steering, and a spring suspension system with offset armatures and damping devices to stabilize the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the vehicle width is reduced to less than 1.6m to enable circulation in alleys, then the vehicle can access narrow spaces, but the vehicle stability deteriorates at high speeds due to narrow track width and high center of gravity
Solution Approach 1:
The suspension system incorporates adjustable damping characteristics that adapt to different operating conditions (work mode vs. road mode). The electronic control system dynamically adjusts suspension firmness based on vehicle speed and steering angle, providing softer suspension for maneuverability at low speeds and firmer suspension for stability at high speeds.
Solution Approach 2:
The system changes the damping parameter of the suspension system based on operating conditions. At road speeds above 25 km/h, the damping is increased to reduce body roll and improve stability. At work speeds below 25 km/h, the damping is reduced to improve maneuverability and comfort during cleaning operations.
2Ease of operation
If four steered wheels are used to improve maneuverability at low speeds, then the turning radius is reduced and handling is improved, but the vehicle stability deteriorates at speeds above 25 km/hour
Solution Approach 1:
The four-wheel steering system dynamically changes its operating mode based on vehicle speed. At low speeds (work mode), all four wheels are steered to achieve tight turning radii and excellent maneuverability in narrow spaces. At high speeds (road mode), the rear wheels are locked straight while only the front wheels steer, providing stable directional control and preventing instability.
Solution Approach 2:
The steering system changes the steering angle parameter of the rear wheels based on vehicle speed. Below 25 km/h, the rear wheels are allowed to steer at angles complementary to the front wheels for maximum maneuverability. Above 25 km/h, the rear wheel steering angle is constrained to zero degrees, effectively locking the rear axle straight for stable highway driving.
3Stability of the object's composition
If the rear axle is locked straight for high-speed stability, then the vehicle can travel at 80 km/hour safely, but the maneuverability deteriorates at low speeds
Solution Approach 1:
The system dynamically switches between two operational states based on vehicle speed. In road mode (v > 25 km/h), the rear axle is locked straight to provide stable high-speed travel capability of up to 80 km/h. In work mode (v < 25 km/h), the rear axle is unlocked to allow four-wheel steering for tight maneuvers and narrow space navigation.
4Stability of the object's composition
If a mechanical axle locking device is implemented to enable high-speed travel, then the vehicle can maintain directional stability, but the device complexity increases
Solution Approach 1:
The mechanical locking device is designed to operate automatically based on vehicle speed and steering conditions, without requiring manual intervention. The system self-activates the rear axle lock when high-speed conditions are detected (speed > 25 km/h and wheels aligned) and self-releases when work mode conditions are detected, reducing operational complexity.
Solution Approach 2:
The system replaces purely mechanical speed-sensing mechanisms with an electronic control system that monitors vehicle speed and steering angle sensors. This electronic control system actuates the mechanical locking device, combining electronic sensing with mechanical actuation to reduce the complexity of mechanical speed-sensing mechanisms while maintaining reliable operation.
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 the vehicle to maintain stability and safety at high speeds, allowing it to operate effectively at both low working speeds and higher road speeds while maintaining maneuverability and directional capabilities.
Implementation Method 1
a vertical blocking jack combined with a spring and equipped on the underside with a seal providing sealing between the two interfaces
Implementation Method 2
a seal providing sealing between the two interfaces
Implementation Method 3
the hydraulic pressure present in the locking cylinder opposes the force of the spring, the piston of the cylinder being in the high position
Implementation Method 4
the hydraulic pressure present in the locking cylinder opposes the force of the spring
Implementation Method 5
the piston head passes through a housing in the upper plate and locks in a conical housing in the lower plate causing the rear axle to lock
Implementation Method 6
said vehicle also being able to be equipped with means carrying out additional functions of cleaning the surface such as for example washing the latter
Implementation Method 7
vehicle whose wheel sets comprise a spring suspension system
Data Source
Figure 1~4
Figure 5~11
Figure 9~15
AI summary
The vehicle has a mechanical locking device with a mechanical interface and a vertical locking cylinder such that hydraulic pressure in the cylinder opposes force of a spring, and a pivoting lower plate pivots, when the vehicle is in work mode. The cylinder is not supplied with hydraulic power, and a piston head traverses a housing of a fixed upper plate and is locked in a conical housing of the lower plate if front wheels and rear wheels (204) are aligned, so as to lock a rear axle (203) when the vehicle is in road mode. A spring suspension system (201) is connected with the axle.