REPORT ON
Under the Guidance of
Mr. Amol Talankar
Author : Sagar k. Rajput
Mechanical VIII Sem.
CHAPTER 1
INTRODUCTION
Narrow track cars are without doubt the future of urban mobility. These
cars have a very short whee...
Such cars combine the comfort of a car with the functionality of a motor
bike. But these cars have a very important and da...
CHAPTER 2
LITERATURE SURVEY
‘Narrow track cars’ is not a new term. Several production models do exist and several
prototyp...
This car is powered by two motors each driving one rear wheel. It has a
maximum speed of 120 kmph. But narro is a tall car...
Tilting trains are an optimum solution for this problem. These types of
train, tilts the body on the curve, this in a sort...
fig.6
CHAPTER 3
OBJECTIVES
The objective of this project work is to successfully
develop a design of a tilting mechanism for a n...
CHAPTER 4
FABRICATION AND DESIGN PROCEDURE
PROCEDURES
FRAME DESIGN
The frame has been designed with parameters taken from an already
existing and successful narrow t...
DESIGN OF THE TILTING MECHANISM
The tilting mechanism design was a complex question. Initially it was decided
to use power...
STEPPER MOTOR DESIGN
For tilting the vehicle by 20 degree each side should be able to move up and
down by at least 13 cms ...
CHAPTER 5
TESTING OF DESIGN
The designed tilting mechanism has been recreated and tested in pro-e
simulation program. Init...
ADVANTAGES
Several of the advantages of our design over conventional
car was discussed previously. They are summarized bel...
FUTURE DEVELOPMENTS
1.The car design in itself is futuristic and can be soon find in some
production versions of four-whee...
NARROW TILTING OF CAR
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NARROW TILTING OF CAR

Published on: Mar 3, 2016
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Transcripts - NARROW TILTING OF CAR

  • 1. REPORT ON Under the Guidance of Mr. Amol Talankar Author : Sagar k. Rajput Mechanical VIII Sem.
  • 2. CHAPTER 1 INTRODUCTION Narrow track cars are without doubt the future of urban mobility. These cars have a very short wheel track in comparison to normal cars. Most of the international car companies have production models and prototype of narrow track cars. Some examples are Nissan Land Glider, Nissan Pivo, Honda 3R-C, etc. Such cars are mostly single seated or double seater with back to back seating configuration. These cars have several advantages: •Half the width means half the weight, more rigidity, more access to narrow roads, easier parking and much quicker transit times. •In an electric vehicle, the lighter weight of this much smaller vehicle will help to enhance torque power characteristics of an electric motor to achieve “linear acceleration”. •At highway cruising speeds, such cars will be using half the frontal area and half the drag co efficient, plus reduced running losses make for a very energy efficient vehicle. All these advantages make the narrow track vehicle so appealing as an alternative to the car.
  • 3. Such cars combine the comfort of a car with the functionality of a motor bike. But these cars have a very important and dangerous drawback. With a very comparatively narrow track and heights almost equal to normal cars, these cars are very susceptible to rolling. As of now all such narrow track cars are electrically driven and have a limited top speed and hence this drawback is comparatively negligible. But sooner or later these cars will have to get highway cruising speeds. Then this drawback will be of grave importance. Our project took shape as an attempt to face this drawback. We thought so if the cars has the functionality of a motor cycle why not give it the flexibility of a motor cycle. This gave use to the idea of an auto-tilting car. There has been many tilting body designs in rail but what we have done is not just a body tilting, in it the car tilts as a whole. Recently there had been some development in making three- wheeled tilting cars like the carver, but only prototypes or concepts exist in the field of four-wheeled tilters.
  • 4. CHAPTER 2 LITERATURE SURVEY ‘Narrow track cars’ is not a new term. Several production models do exist and several prototypes are being tried out by major automobile companies. Some production models are Nissan Pivo, Honda 3R-C etc Several automobile majors like Toyota, Mercedes, Nissan, Kia, Suzuki etc have prototypes for narrow track cars. fig.1 A very successful product is a narrow car of the name NARRO. This car is expensive at $46000, but has managed to find customers which stresses the acceptability of narrow cars for public.
  • 5. This car is powered by two motors each driving one rear wheel. It has a maximum speed of 120 kmph. But narro is a tall car, too tall for its track. It rolls tremendously on curves, the manufacturer have compensated for this by providing it a very stiff suspension. Since the car is only meant for urban road use the compromise made in suspension does minimum damage, but even with stiff suspension, the threshold velocity of this car in a curve is very low in comparison to a full track width car. TILTING TRAIN Tilting trains are today common in Europe and Japan. These trains are rail-running, they have very high curve velocities. Inorder to enable trains, to negotiate curves at high speeds, tracks are slightly banked (upto 11 degrees). But these trains are too fast, and it is not possible to tilt track beyond a limit because trains also pass along these curves really slowly at times.
  • 6. Tilting trains are an optimum solution for this problem. These types of train, tilts the body on the curve, this in a sort enables faster curve threshold speed and increased passenger comfort. The figure below shows two tilting mechanisms used in trains. THREE WHEELED TILTING CARS These type of cars are a new species, but their number is fast increasing. These cars tilt about their rear wheels. Either there can be two wheels at the rear like the carver. Which has two wheels at the rear and the car body tilts about the rear wheels. Steering is done using front single wheel. Or these can be one wheel at the rear about which the body tilts. Like the GTR (Grand Tilting Racer).
  • 7. fig.6
  • 8. CHAPTER 3 OBJECTIVES The objective of this project work is to successfully develop a design of a tilting mechanism for a narrow tilting car. The mechanism is to be reliable, simple, cost- effective and practically feasible. The aim of this tilting mechanism is to provide banking to the car on unbanked curves, so as to enable added threshold speed on curves in comparison to a narrow non-tilting car. This system is also supposed to enhance passenger comfort as the side force felt by passengers in a car taking a turn is comparatively less in a tilting car. Also in our purpose is the fabrication of a mini-prototype –a remote controlled toy car-to demonstrate the tilting in real world.
  • 9. CHAPTER 4 FABRICATION AND DESIGN PROCEDURE
  • 10. PROCEDURES FRAME DESIGN The frame has been designed with parameters taken from an already existing and successful narrow track car. The entire suspension system has been redesigned and an additional tilting tyre holder was welded on the frame both at front and rear. The adoption of an already existing frame for our design ruled out the requirement of stress analysis. The frame is sure to hold on, even in case of most hostile conditions, as it is a tried and tested design. DESIGN OF DRIVE MOTOR. In the design of the car we have followed a “no risk policy”, instead of designing all the parts by ourself. We have used parts already tried and tested in others cars. This is advocated as we needn’t have to test these already tested parts unnecessarily. Also these parts are already in use and are satisfactory in their operation. The only new design is actually the suspension and the tilting mechanism. In design we have decided to stick to an electrical drive system for the vehicle, though it is going to be more expensive than oil, it is certainly futuristic and eco-friendly. Besides, the electrical drive system can be mounted lower and can help to lower the center of gravity and thus increase the threshold speed at curves
  • 11. DESIGN OF THE TILTING MECHANISM The tilting mechanism design was a complex question. Initially it was decided to use power screw driven screw driven screw holders for each individual wheel controlled by a stepper motor. The design almost completed. It had several advantages: •Each wheel could be moved independent of the other. •More precise control was possible with power screw lifters. 3)It could be modified to incorporate other systems like body level control, ground clearance adjustment system et LITHIUM ION BATTERY A lithium-ion battery (sometimes Li-ion battery or LIB) is a family of rechargeable battery types in which lithium ions move from the negative electrode to the positive electrode during discharge, and back when charging. Lithium-ion batteries are common in consumer electronics. They are one of the most popular types of rechargeable battery for portable electronics, with one of the best energy densities, no memory effect, and a slow loss of charge when not in use. Beyond consumer electronics, LIBs are also growing in popularity for military, electric vehicle, and aerospace applications. Research is yielding a stream of improvements to traditional LIB technology, focusing on energy density, durability, cost, and intrinsic safety.
  • 12. STEPPER MOTOR DESIGN For tilting the vehicle by 20 degree each side should be able to move up and down by at least 13 cms . fig 18 This gives the total rotational measure for the stepper motor i.e. 64.13 degree in all. The stepper motor is to be controlled by a microprocessor based on inputs from the following types of sensors. •Speed of sensor •Steering position sensor •Yaw rate sensor •Level sensor A stepper motor (or step motor) is a brushless, synchronous electric motor that can divide a full rotation into a large number of steps.
  • 13. CHAPTER 5 TESTING OF DESIGN The designed tilting mechanism has been recreated and tested in pro-e simulation program. Initially, the tyre resisted movement and after many rounds of fine-tuning the dimensions, the assembly began to show positive results. Only the rear rotating tyre had to be tested as the front was not under powered motion. The front rotating tyre assembly was also dimensionally modified to suite the rear one. Certain range of motion was imparted to the rear rotating tyre and the process was captured as a video for presentation. The complete frame design with final dimensions is:
  • 14. ADVANTAGES Several of the advantages of our design over conventional car was discussed previously. They are summarized below: •This car is much more efficient than a conventional gasoline car due to reduced aerodynamic drag at cruising speed due to reduced frontal area. •This design combines the utility of a car with the flexibility of motor bike. •Narrow track cars are definitely future of urban mobility, but our tilting car can also handle highway cruising as well. •Like any other electric car, it is cheap to run and environment friendly. •It is also likely to be a solution to real day traffic congestion.
  • 15. FUTURE DEVELOPMENTS 1.The car design in itself is futuristic and can be soon find in some production versions of four-wheeled tilting cars. 2. A feature can be added to the existing suspension using a minor programming change, the system can also act as body leveler in transverse direction using the level sensor, this feature enables added gradability in sideward direction. REFERENCE 1) Salim Maakaroun, Wasima Khali GEOMETRIC MODEL OF A NARROW TILTING CAR USING ROBOTIC FORMALISM. 2) Gohl J, Rajamani R Development of a novel tilting controlled narrow commuter vehicl(internal report May 2006) 3) pro-E design

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