The Problem
Traditional motorcycle main stands often require significant physical effort to deploy, leading to user discomfort and inefficiency. This is especially true for heavier motorcycles. Existing designs lack adaptability to different terrains and often have inadequate ergonomic considerations, creating a barrier for many riders and posing potential safety concerns.
Our Solution
To address these challenges, we developed an innovative main stand based on a **slider-crank mechanism**. This design transforms a simple downward push from the rider into the powerful rotational torque needed to lift the motorcycle. The primary goal was to drastically reduce the required force, making the stand accessible and easy to use for everyone, even without dismounting the vehicle.
Key Advantages:
- Reduced Deployment Force: The core innovation minimizes the physical effort needed to engage the stand.
- Enhanced Ergonomics: The intuitive design allows for smooth operation, enhancing user comfort.
- Dual Functionality: The stand can be deployed on one side to function as a side stand, or on both for the stability of a central stand.
- Robust and Lightweight: Strategic material selection ensures structural integrity while minimizing weight.
Stand Operation & Actuation
The mechanism is designed for ease of use, allowing the rider to deploy the stand without dismounting. The process involves tilting the vehicle to one side and applying a small force to the crank's extension. This engages the slider-crank mechanism, which extends the stand's leg to the ground. The process is then repeated on the other side for full central-stand stability. This design also allows it to function as a conventional side stand by deploying only one leg.
Stage 1: Retracted Position. The stand is fully retracted during normal operation.
Stage 2: Side-Stand Deployment. Leg is extended without deployment, functioning as a side stand.
Stage 3: Full Deployment. Both legs are extended, providing full central stand stability.
Component Design & Manufacturing
The design focused on creating components that were both strong and lightweight. The links of the slider-crank mechanism were designed with an I-beam cross-section, a standard engineering practice to maximize strength and stiffness while minimizing material and weight. This was critical for the AL 6061-T6 aluminum links.
Link 1 I-Section Design: This cross-section provided the necessary strength to handle compressive forces.
Link 2 I-Section Design: A consistent I-section ensured uniform load-bearing capabilities.
Manufacturing Process
The components were fabricated using a combination of modern manufacturing techniques to ensure precision and durability. The aluminum links were produced via **CNC Milling** from AL 6061-T6 billets, while the main stand's central tube was formed using **Pneumatic Pipe Bending** on AISI 4130 steel. Final assembly involved **TIG welding** for strong, clean joints.
The Design Journey: From Concept to Prototype
The final product was the result of a rigorous, iterative design process, evolving through four major versions based on prototyping and user feedback. Early prototypes helped identify weaknesses in the initial link design, leading to the final, robust Version 4.
Version 2: Early functional prototype mounted on a test vehicle for initial user feedback.
Version 3: An interim design developed to address stability issues found in the V2 prototype.
Version 4: The final, refined design, prototyped to validate geometry and assembly before manufacturing.
Technical Deep-Dive & Analysis
To validate the design, we performed extensive Finite Element Analysis (FEA) using SOLIDWORKS Simulation. The analysis was conducted with a factor of safety of 2, simulating a total load of 1320N.
Key Findings (Fully Extended Position):
- Maximum Stress (von Mises): The analysis showed a maximum stress of **413.5 MPa**. While this exceeds the material's yield strength of 276 MPa, this value occurs at localized stress concentration points (like sharp corners in the CAD model) which are managed through design fillets and do not represent a failure of the overall structure. The operational stress across the main body of the components remained well within safe limits.
- Maximum Displacement: The stand exhibited a maximum displacement of only **0.7 mm** under full load, confirming its high rigidity and structural stability.
Spring Mechanism Validation
A crucial component for stability is the spring that prevents unintentional movement and vibration. We experimentally determined the required spring constant using an **AVERY Spring Testing Machine**. By measuring the force required for displacement at 2mm intervals, we plotted the results and calculated a spring constant (k) of **2.0236 N/mm**.
Stress Analysis: The von Mises stress plot indicates that stress levels are safely managed across the structure.
Spring Testing: Determining the spring constant experimentally with an AVERY testing machine.
Future Scope
This project lays the foundation for future innovations. Potential enhancements include motorizing the deployment with a servo motor for fully automated operation, integrating open-coil springs for default-open states, and adapting the core mechanism for industrial or agricultural applications requiring stable, adjustable support structures.