Segmented Wheel Hub Turnstile Mechanism for Landscaping Machines
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Solution Overview
Problem
Existing machines for gardening and landscaping face challenges with wheel support systems that are not practical for 180° turns, prone to wear, and susceptible to dirt and high drive power, leading to instability and mechanical failures.
Innovation Solution
A noiseless and wear-free turnstile system with a closed design, featuring a driving bolt-driving profile part system lubricated to prevent wear, allowing for optimal thrust and low friction, enabling smooth cornering and high drive torque transmission, and adjustable for various turning radii.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple contact connection with a screw bolt is used, then the machine can change direction with the drive wheel rotating over a wide arc, but the connection zone is at risk of breaking at high driving and pivoting forces
Solution Approach 1:
The drive wheel is segmented into a wheel body and a separate wheel hub that can rotate relative to each other. The wheel hub is connected to the transverse axis via a turnstile mechanism with a driving pin that can radially disengage, allowing the wheel hub to rotate independently during direction changes while maintaining a strong permanent contact connection for high driving forces.
Solution Approach 2:
The connection between the wheel hub and transverse axis is made dynamic through the turnstile mechanism. The driving pin can radially disengage from the driving profile part when lateral forces exceed a threshold, enabling dynamic adaptation to varying operational conditions - maintaining strong connection during straight driving while allowing free rotation during direction changes.
2Ease of manufacture
If an open design with a ratchet wheel is used, then low drive power can be transferred, but the system is extremely susceptible to faults and not suitable for higher drive powers
Solution Approach 1:
The open ratchet wheel mechanism is replaced with a closed turnstile system where a driving pin interacts with a driving profile part. This substitution creates a more reliable permanent contact connection that can handle higher drive powers while maintaining manufacturing feasibility through standardized components like compression springs and profiled surfaces.
Solution Approach 2:
The turnstile mechanism is enclosed in a protective housing that seals the internal components. This enclosure protects the driving pin, compression spring, and driving profile part from dirt and debris while allowing the mechanism to maintain its reliability under rough operating conditions.
3Ease of operation
If a rotary lock with drivers displaced radially is used, then the wheel can be controlled, but the driver is exposed to high wear due to a front profile acting as a cutting edge
Solution Approach 1:
The driving pin is maintained in permanent contact with the driving profile part through a compression spring, creating an equipotential contact condition. This ensures continuous lubrication and even force distribution across the contact surface, preventing the high localized wear that occurs with cutting edge profiles in rotary locks.
Solution Approach 2:
A compression spring is introduced as an intermediary element between the driving pin and the wheel hub. This spring maintains constant contact pressure between the driving pin and driving profile part, ensuring smooth force transmission and reducing impact loads that would otherwise cause high wear on the driver components.
4Reliability
If the turnstile is designed as a closed system with lubricant filling, then wear is reliably avoided, but the device complexity increases
Solution Approach 1:
The turnstile mechanism components - the driving pin, compression spring, and driving profile part - are merged into a single integrated assembly enclosed in a protective housing. This consolidation creates a sealed unit that requires minimal maintenance while providing reliable wear protection through internal lubrication, balancing improved reliability with acceptable device complexity.
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 turnstile system provides long-term stability and improved straight-line stability, eliminating the need for counter-steering, even in hand-operated machines, while maintaining effectiveness under rough conditions.
Implementation Method 1
with a compression spring (13, 13') acting as the actuating element (11)
Implementation Method 2
These mechanical components in the system are surrounded by a lubricant filling in such a way that signs of wear are reliably avoided
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
The machine, particularly sweeping machine, a mowing machine, a snow plough has a chassis having two drive wheels (3) at a transverse axis (6) and a driving motor. A turning barrier (D) is provided with a driver (10) transferable within the range of a supporting connection by a positioning element (11) shifted in a radial direction to the transverse axis and in a plant position.