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ABSTRACT

This paper is based on the project “Power Assisted Gear Shifting Mechanism for Automobiles”. This is a design, fabrication and implementation project. The project provides solution for gear shifting for the cars. The passenger cars that now ply on the road have transmission either of manual or automatic type of gear changing. The manual type of transmission is preferred for the perfect performance without a loss in power but a compromise for comfort ness. In this type automatic system of power transmission there is easiness of gear shifting but there is a definite loss of power and mileage. The main objective of this project is to create a mechanism to reduce the inconvenience caused when changing gears in the car. The gear shifting here is by mere pressing of feather touch buttons present on the dash board. The gear shifting is by hydraulic force achieved by a simple modification to the gear box. This is a versatile pack, simple and can be fitted to any car equipped with hydraulic power steering. The setup consists of power steering pump, piston cylinder assembly and a set of fluid valves. This project if implemented is a clear alternative for the Automatic transmission because of its low cost and ease of use. Moreover the whole set up is small and requires a very small space. This can sure be a standard fitment if proper marketing strategy is carried out. Further, automatic clutch can be incorporated with this unit to make it fully automatic.

INTRODUCTION

The paper deals with the real time project, “Power Assisted Gear Shifting Mechanism for Automobiles” which was done in the academic year 2009- 2010. The paper deals with the various design aspects of the creation of this project. This project is aimed at giving driver the convenience for gear shifting. The car with this project will have a series of buttons in the format of 4 forward, a reverse and a neutral. The clutch operation may or may not be put in the car depending on the user. Currently the project has been done for the transmission of third and reverse gears.  The power for gear shifting is got from hydraulic fluid. The power for fluid is from the power steering pump. So a car with a power steering fitment can be easily adaptable to this project. The project has been started as a concept and it requires a lot more work to be done to put in a car.

mechanical project presentation
Hydraulic circuit diagram of the project

PROBLEM DEFINITION

Whenever a project is carried out there is a reason behind it. The existing cars now pose some problems for the drivers. In the Manual Transmission cars the main problem for the drivers is the gear shifting. But the engineering concept behind this type of transmission paves way for higher power transmission efficiency. More over the mileage of the car and life is also more. These cars do not give much of comfort ness for the drivers in the terms of using the gear lever and the clutch. Also it occupies a major area in the cabin resulting in the space congestion. These are the problems in the Manual Transmission cars.

In the Automatic Transmission type of cars, the gear shifting is easy. We just have to select the drive band, which is already preset. This selection may be either of lever type or a set of buttons. This is easy for the drivers as they don’t have to use clutch during gear shift. But there is a compromise for power transmission and mileage. As the gear selection is by a fluid, power is required to drive it, so the engine performance is reduced.  So the problem here is mileage drop, power loss and also it is costly.

The need of the hour, combining the position of both MT and AT a mechanism has to be created for better mileage and comfortable gear shifting. This is the objective of the project. So a car with this project provides ease of gear shift as in AT without a compromise in mileage as in MT. the cost of the project is less as it requires a minor alteration in the gear box.

DESIGN OF PROJECT

The project is done as a table top on the FIAT car’s gear box. The project design comprises of designing the following parts,

  1. Hydraulic circuit
  2. Electronic circuit
  3. Mechanical components

WORKING PRINCIPLE

The main driving force for the gear shifting is by the hydraulic fluid. The gear shifting along with the clutch operation works with the pressing of buttons. On pressing the button corresponding to the gear, three operations take place,

  1. Engine rotation
  2. Clutch engagement
  3. Pump rotation

When the car is switched on the engine rotates, on pressing the button clutch engages. Now electromagnetic clutch engages the pump. Due to the pump rotation the hydraulic fluid is pumped from reservoir to the inlet solenoid valve. Through this valve the fluid pushes the piston in the cylinder. This motion causes the gear shifter rod to engage the gear which is fitted to the piston. In order to avoid slippage of gear a limit switch is used to sense the position of selector rod and cut off the supply.

To bring the car to neutral position we press the N button. Now the outlet solenoid valve energizes so the fluid in the cylinder rushes back to the sump with the aid of spring tension. If the next higher gear has to be selected, the same operation takes place on pressing the next button.

MERITS AND DEMERITS

A project with a novel idea does have its own merits and demerits which are discussed below,

Merits:

  1. A clear alternative for Auto Transmission this, is much cheaper and user friendly with more features.
  2. Leg room for passengers at front is increased more since the removal of gear rod.
  3. Ease of operation, by the use of feather touch buttons.
  4. A boon for the handicapped, the car can be driven even with only one hand since buttons are used for changing gears.
  5. No loss in mileage of the car as the load required for gear shift is meager.
  6. Gear shift is sequential, so no problem of wrong gear selection.

Demerits:

Since the project is custom made, it requires a skilled technician to assemble the set up in the car, considering the space constraints. Moreover the driver should be well trained in using the system to avoid malfunction.

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JJ

This is Mr.Jose John, 21 yrs old guy, currently pursuing final year mechanical engineering, now become an enthusiastic blogger and a successful entrepreneur.
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4 Comments

  1. Estela says:

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  3. Joe Smith says:

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  4. Tom says:

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