Internship Report on Research and Design of Lopifit Treadmill Walking Bicycle

ABSTRACT

Walking Bike is a totally new way of moving. With the electric assist it takes no more effort to walk than “a walk in the park”. The electric assist in combination with the gear is boosting your walking pace up to the speed of the regular bike. In this bicycle the frame of the bicycle is completely modified and the treadmill is placed in between the two wheels, on which the user will walk. When you are walking on the walking bike, you push the treadmill backward with your feet and the belt moves to the rear. At the rear roller the RPM Sensor is attached to the roller, from where the sensor senses the speed of the roller and sends the signal to the motor. The motor now supports you to continue the walking movement. Using breaks, motor speed will reduce slowly. The walking bike has a sturdy and balanced base. If there are little pebbles on the road it will just cruise along a regular bike. The rubber of the treadmill has an anti-slip structure which will prevent you from sliding off the bike. “This project inspired me to build a vehicle that is faster than walking and easier to ride than a bicycle”.

INTRODUCTION

The Lopifit treadmill walking bicycle is also highly customizable. You can adjust the handlebars, seat, and pedals to fit your body size and shape, ensuring a comfortable and personalized riding experience. You can also choose from a variety of colors and styles to match your personal style and preferences. The bike's electric motor is powered by a rechargeable battery, which can provide a range of up to 55 miles on a single charge. This makes the Lopifit a practical option for longer rides, especially for commuting or running errands. In terms of safety, the Lopifit is designed with several features to ensure a safe and secure ride. It has an integrated lighting system, including front and rear lights, making it visible to other road users. It also has reflectors on the pedals and wheels, and a horn to alert other riders or pedestrians. The Lopifit treadmill walking bicycle is not just a practical and sustainable mode of transportation, but it is also a fun and exciting way to stay active and explore your surroundings. Whether you are commuting to work, running errands, or just enjoying a leisurely ride, the Lopifit offers a unique and rewarding experience that is sure to leave you feeling energized and invigorated.

The Lopifit treadmill walking bicycle is not only a convenient and eco-friendly mode of transportation, but it also provides many health benefits. It can improve your cardiovascular health, strengthen your muscles, and help you burn calories. Additionally, it is a low-impact exercise that is gentle on your joints, making it a great option for people of all ages and fitness levels. The Lopifit is also very easy to use. It has a simple and intuitive design, and the electric motor provides a boost to your walking or running motion, making it easy to maintain a consistent speed. The bike is equipped with brakes and a throttle, allowing you to control your speed and stop quickly when necessary. The Lopifit is an excellent choice for people who want to reduce their carbon footprint and contribute to a cleaner environment. It is a sustainable form of transportation that does not emit harmful pollutants or require fossil fuels. In summary, the Lopifit treadmill walking bicycle is a unique and innovative mode of transportation that provides a fun, efficient, and eco-friendly way to stay active and get around. With its many health benefits and ease of use, it is becoming an increasingly popular choice for commuters, leisure riders, and fitness enthusiasts alike.

Benefits:

1. Provides a low-impact workout for individuals who may have joint pain or other health issues that prevent them from jogging or cycling.
2. Reduces carbon footprint by offering a sustainable transportation option.
3. Suitable for commuting and exercise
4. Saves time by combining exercise and transportation.
5. Enhances cardiovascular health, weight loss, and endurance.

PROBLEM STATEMENT

`While working out in the gym people use the treadmill for the purpose of jogging and running. The main drawback of a treadmill is that it is stationary. That becomes boring for users to run in a still environment with natural exposure to the environment. Similarly cycling in the conventional way is common and not possible for all age groups as old people prefer walking. Even for traveling short distances.

Prefer vehicles that cause pollution and wastage of energy in terms of fuel. So, we came up with the concept of a walking tricycle.

• In our day to day life we see that many people use bikes and cars as a source of transportation. This results in environmental pollution and fuel consumption.
• In a manual treadmill the motion of the treadmill is rough. To overcome this we use a motor to rotate the rotors.
• Batteries which are widely used in the automobile sector are not rechargeable thus when they are disposed create pollution.
• To improve all above phenomena we take initiative by designing something which would help to reduce these harmful results.

PROPOSED SYSTEM

Treadmill cycle is the new way of locomotion. It makes workouts more interesting and competitive. There is no need to get stuck in the gym at a corner when you can roam while you workout. Secondly, looking at the ever-growing problem of pollution, this cycle turns out to be eco-friendly without emission of harmful pollutants. Moreover it saves fuel thus helping in saving the natural resources. Lastly, in this metropolitan world, people are ignoring their health and fitness.

This cycle would be a boon for such fitness deprived people having hectic schedules. Useful for exercise purposes. To reduce the use of non-renewable energy sources.

EXISTING MODEL OF LOPIFIT TREADMILL BICYCLE

The Lopifit bike is an innovative and totally new way of moving and exercising. The bike is propelled by a 350W motor by a 48V 20 Ah Lithium-Ion battery which turns the treadmill while you walk. The battery will generate power for a typical rider to get 30 to 50+ miles per charge making the bike a viable form of local commuter transportation.

The electric assist in combination with the adjustable multi-speed gears boosts the riders walking pace to speeds equal to or greater than a regular bike. The rider chooses the gear/speed they want which allows them to reach speeds of 3 to 20 MPH. Lopifit also provides fantastic low physical impact high cardio high-calorie burn exercise while riding down the bike path with the breeze in your hair and the sun on your face.

NEW MODEL WITH MORE UPDATES FOR INDIAN ROADS

WALKING BELT

The walking surface of a treadmill comprises the thin moving belt and a rigid plate held between the two surfaces of that belt so as to provide support when the transverse load of footfalls is applied. The treadmill belt size is an important characteristic in your treadmill if you are preparing for running or jogging on your treadmill. If you are planning on walking, the belt size is not of much importance. Standard belts run with size 19" wide by 50" long. Although this appears like a good width and length, you must note that the belt goes onto a deck, which includes part of the frame and your console. So even if your belt is 19 x50, your running space may be 16 by 45.

WHEELS

A wheel is a circular component that is made to rotate on an axle bearing. The wheel is one of the major components of the wheel and axle which is one of the six simple machines. Wheels along with the axles, allow heavy objects to be moved easily allowing movement or transportation while supporting a load or performing labor in machines A wheel greatly lessens friction by facilitating motion by rolling together with the use of axles. For rotations of the wheel, a moment must be applied to the wheel about its axis, either by way of gravity or by the application of another external force or torque.

ROLLERS

Bicycle rollers are a type of bicycle trainer that make it feasible to ride a bicycle indoors without moving forward. However, dissimilar to other types of bicycle trainers, rollers do not confine to the bicycle frame, and the rider must balance him or herself on the rollers while training. Bicycle rollers normally comprise three cylinders, drums, or "rollers" (two for the rear wheel and one for the front wheel), on top of which the bicycle runs. A belt joins one of the rear rollers to the front wheel of the bicycle to spin when the bicycle is pedaled. The spacing of bicycle rollers can normally be adjusted to match the bicycle's wheelbase. Generally, the front roller is adapted to be slightly ahead of the hub of the front wheel.

BEARINGS

A bearing is a machine element which holds another moving machine element. The moving machine element is called a journal. Bearing allows a relative motion between the contact surfaces of the members while transferring the load. A certain amount of power is wasted in removing frictional resistance. So as to reduce frictional resistance and wear and to carry away the heat generated, a lubricant may be utilized. The lubricant used is often a mineral oil refined from petroleum. The bearing block is provided to hold the bearings. It is made up from cast iron. All the bearings are fabricated on the machine frame.

SPROCKET

A sprocket or sprocket wheel is a profiled wheel which has teeth, cogs, or even sprockets that mesh with a chain, track or other perforated or indented material. The name 'sprocket' applies usually to any wheel upon which radial projections retain a chain passing over it

CHAIN

A chain is a series of connected links which are typically made of metal. A chain may consist of two or more links. Those designed for lifting, such as when used with a hoist; for pulling; or for securing, such as with a bicycle lock, have links that are torus shaped, which make the chain flexible in two dimensions (The fixed third dimension being a chain's length.)

WORKING PRINCIPLE

When we walk or run on the walking surface it gives rotation to the rear wheel of the bicycle and the treadmill bicycle is moving forward. The walking surface of a treadmill consists of the thin moving belt and a rigid plate placed between the two surfaces of that belt in order to provide backing when the transverse load of footfalls is applied. The original and unmodified treadmill used a sheet of 0.75 inches pressed particle board as a support plate. This was attached to the frame of the treadmill at four points with wood screws placed near the four corners of the sheet. While resting on the rails in a lowered position, the plate received vertical support from small metal risers at the mounting points and from two rubber pads placed under the longest edge of the surface midway between the hard mounting points. According to the manual provided with the treadmill, the design intent behind this flexible multi-point mounting system was to reduce the overall stiffness of the plate by providing less support than that provided by direct attachment to two solid rails. In actual practice, the thickness and stiffness of the particle board surface were more than required to remove all discernable deflection from the system. Users were unable to distinguish the difference in stiffness when additional aluminum supports were inserted between the sheet and the rails, in order to remove the compliant effect of the rubber supports.

DESIGN CALCULATIONS

Calculation for Chain Drive Parameters taken from standard specification of sprocket: No. of teeth on the sprocket = 18

Speed of sprocket = 24.8 RPM

Outside diameter of the sprocket Do = 76 mm

Pitch circle diameter of the sprocket Dp = 70 mm

Center to center distance = 540mm

Velocity ratio of the chain drives

Here both the sprockets have the same diameters and same no. of teeth Speed of the sprocket 1 is same as speed of the sprocket 2

So, Speed of the chain driven N2 = 24.8 RPM

Average velocity of the chain V = π D N / 60

V = 93.44 mm /sec V = 0.0933 m/s

Length of the chain:

Let us assume

Central distance between the chain sprocket and chain Driven

X = 762 mm

The length of the chain must be equal to product of the number of chain links and pitch of the chain

L = k x p

Number of chain links

K = (T1 + T2) /2 + (2X/p) + ((T2 - T1) / 2π) 2 (p/x)

K = 139.92

Length of the chain L = k x p L = 1749.5 mm

L = 1.75 m

Determination Of Basic Dimension:

1-Belt Dimension =1.1m×0.4m

2-Frame Dimension {including clearance}=1.2m×0.5m

3-Wheel Size [in mm] a-Front 50-600 b-Rear 50-450

Total length of vehicle = 2.4m

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CONCLUSION

The Lopifit is an innovative and eco-friendly alternative to traditional bicycles and exercise equipment. Its unique design combines the benefits of walking, cycling, and treadmill workouts, making it an excellent option for individuals seeking a low-impact workout. The Lopifit's convenience and sustainability make it a valuable addition to any fitness routine or daily commute.

This system can be efficiently used anywhere whether it is outdoor or indoor. This utilizes highly fuel-saving technology which is a major requirement of this era. In the future, it can be used as an indoor locomotive device infrastructure with a large roof span i.e. malls, warehouses, open markets, large office spaces, etc. By using such products, pedestrian cops can protect themselves from getting exhausted. Pedestrians in large campuses can benefit from this product the same way.We can replace bicycles as an energy efficient vehicle for those who cannot drive a cycle.