Fan Vehicle with Adjustable Wind Resistance for Pedal Training

The problem

Many pedal-powered recreational vehicles or indoor training units rely on mechanical friction or magnetic brakes to provide resistance. These systems can be heavy, require maintenance, or offer resistance levels that feel artificial compared to natural movement. Additionally, adjusting resistance often requires stopping the vehicle or using complex electronic controls. For outdoor pedal carts or hybrid fitness devices, there is a need for a lightweight, direct method to vary effort based on speed and physical input, without adding significant weight or complexity.

The solution

This patent describes a fan vehicle where the primary source of resistance is aerodynamic drag generated by a rotating wind wheel.

1. The vehicle frame holds two pedals spaced apart for the user to step on.
2. A wind wheel is linked to the pedals, so it rotates whenever the user pedals.
3. The wind wheel consists of multiple blades arranged around a central axis.
4. Crucially, each blade is mounted on its own blade rotating shaft, allowing it to pivot (autorotate) independently of the main wheel spin.
5. An operating mechanism connects to the blades. When the user manipulates this mechanism, it drives the blades to rotate around their individual shafts.
6. As the blade angle changes, its windward area (the surface facing the airflow) increases or decreases.
7. This change in surface area directly alters the movement windage (air resistance), providing variable load to the rider.

Who it is for

• Fitness Equipment Brands: Companies looking to differentiate stationary bikes or cross-trainers with a unique, mechanical “air brake” feel that doesn’t require electricity.
• Outdoor Recreation Manufacturers: Makers of adult pedal carts or trikes who want a built-in way to simulate uphill effort or high-speed drag without adding heavy flywheels or disc brakes.
• Rehabilitation Centers: Facilities needing low-impact, adjustable resistance tools where the load scales naturally with the user’s pedaling speed and effort.
• Industrial Designers: Teams exploring simple, robust mechanisms for variable resistance in consumer products, avoiding complex electronics or wear-prone friction parts.

How it works

The main parts

Operating Steps

1. Pedal Motion: The user steps on the pedals, causing the wind wheel to spin. The blades revolve around the central shaft.
2. Adjustment Input: The user pushes or pulls the operating member (handle).
3. Force Transmission: This action moves a slider along the rotor shaft via a linkage assembly (first, second, and third links).
4. Blade Rotation: The sliding motion forces the blades to rotate around their individual blade rotating shafts.
5. Resistance Change:
   • To increase resistance: The blades turn to present more surface area to the air (higher windward area).
   • To decrease resistance: The blades turn to slice through the air more easily (lower windward area).
6. Locking: The handle’s self-locking feature holds the blades at the desired angle during riding.

Applications

Indoor Cycling Trainers

For home gyms, this design offers a silent, electric-free resistance option. The “feel” of the air resistance increases exponentially with speed, mimicking outdoor riding dynamics without needing a large fan motor or magnetic brake unit. It appeals to users who prefer mechanical simplicity and durability over smart-connectivity features.

Adult Pedal Carts

Outdoor recreational trikes or quadricycles can use this system to give riders control over their exertion level. On flat ground, the blades can be set to minimum resistance for easy cruising. If the rider wants a workout or faces a slight incline, they can manually increase the blade angle to add drag, simulating a heavier load without braking the wheels themselves.

Rehabilitation Devices

Physical therapy settings benefit from the linear and predictable nature of aerodynamic resistance. Since the resistance is tied to the rotational speed and blade angle, therapists can set specific, repeatable loads. The lack of electrical components makes the device safer for wet environments or areas where power supply is unreliable, and the self-locking handle ensures stability during patient exercises.

Educational STEM Kits

The mechanism serves as an excellent teaching tool for physics concepts like aerodynamics, torque, and mechanical linkages. Schools or hobbyists can build scaled-down versions to demonstrate how changing the angle of attack affects drag. It provides a tangible example of converting human kinetic energy into controlled mechanical work without hidden electronic black boxes.

Where it is less suitable

• High-Speed Road Vehicles: At very high speeds, the aerodynamic noise and potential instability of large spinning blades may be undesirable compared to enclosed drivetrains.
• Compact Urban Commuters: The large diameter required for an effective wind wheel makes this unsuitable for foldable or ultra-compact personal transporters.
• Precision Electronic Feedback Systems: Users requiring exact wattage readings or programmable interval training with digital displays will find this purely mechanical system lacks the necessary data integration capabilities.