MERITS AND DERITS OF GEAR BOX

Introduction:
Gears are the most common means used for power transmission. They can be applied between two shafts which are parallel, collinear, perpendicular and intersecting, perpendicular and non-intersecting, inclined at any arbitrary angle. In spite of these advantages, gear system has many disadvantages also.

 

Merits:

 

1. Provide positive drive without slip.

2. Suitable for high speed, high torque & high power transmission.

3. Properly designed & properly maintained gear system can run over decades.

4. Very high transmission ratio is practicable.

5. Compact machine train in limited space.

6. Low noise level

7. High efficiency

8. High reduction ratios

9. Decrease in output speed

10. Durable

 

Demerits:

 

1. Needs Proper Lubrication System which involve high cost.

2. Needs Proper alignment- misaligned gear train will damage within very short time.

3. Misaligned gear mesh or lack of lubrication will make noise & vibration.

4. Spare gear is costly and proper replacement gear is difficult to procure in many cases it is available only from OEM source.

5. Require skilled technician to maintain.

6.More costly than other drive systems

7.Proper lubrication is necessary for smooth running

8. Poorly cut teeth may result in excessive vibration and noise during operation

9. Quality matters and adds to cost

Comments

Post a Comment

Popular posts from this blog

PISTON RINGS

Image
Introduction: Piston rings are provided on the piston. These are used to seal the high pressure side (cylinder) and low pressure side (crank case), i.e. to prevent leakage of gases. There is one oil ring also which is used to scrap the lubricating oil at the cylinder surface so that it returns to crank case. Pistons ring details:                                                                                     Fig:  Piston rings   Rings seal the compression in the combustion chamber and the motor oil in the crankcase. Automotive engines use 3 rings: 2 compressions and 1 multi-piece oil ring. Rings are usually made of cast iron Can be plated with chrome or molybdenum. Help seal the ring to the cylinder wall. Shapes of the ring vary to also help the ring seal better.     Piston Ring Wear: Causes a loss of compression.                  Causes excessive oil consumption. May cause blue smoke out the tail pipe. Types of the piston rings: There are six types of the p
next page

TYPES OF GEAR BOX

Image
Introduction:                  For selecting a gearbox, its structure type, installation form, bearing capacity, output rotational speed, working conditions and other factors shall be considered.   Types of the gear box: (a) Selective type gear boxes:                 (i) Sliding mesh gear box                 (ii) Constant mesh gear box                 (iii) Synchromesh gear box (b) Progressive type gear box (c) Epicyclic type gear box. Sliding Mesh Gear Box:    It is simplest type of gear box out of the available gear boxes. In this type of gear box, gears are changed by sliding one gear on the other. This gear box consists of three shafts; main shaft, clutch shaft and a counter shaft. In a four speed gear box (which includes one reverse gear), the counter shaft has four gears which are rigidly connected to it. Clutch shaft has one gear and main shaft has two gears. The two gears on the main shaft can slide in the horizontal direction along the splines of the main shaft. However, the g
next page

LAYOUT OF AN AUTOMOBILE CHASSIS-1

Image
Automobiles or vehicles can be classified on different bases as On the Basis of Load, On the Basis of Load, On the Basis of Load, Fuel Used, Body, Transmission, and Position of Engine. Classification:    On the Basis of Load (a)    Heavy transport vehicle (HTV) or heavy motor vehicle (HMV), e.g. trucks, buses, etc. (b)   Light transport vehicle (LTV), e.g. pickup, station wagon, etc. (c)    Light motor vehicle (LMV), e.g. cars, jeeps, etc. Wheels (a)    Two wheeler vehicle, for example: Scooter, motorcycle, scooty, etc. (b)   Three wheeler vehicle, for example: Auto rickshaw, three wheeler scooter for handicaps and tempo, etc. (c)    Four wheeler vehicle, for example: Car, jeep, trucks, buses, etc. (d)   Six wheeler vehicles, for example: Big trucks with two gear axles each have four wheels.   Fuel Used (a)    Petrol vehicle, e.g. motorcycle, scooter, cars, etc. (b)   Diesel vehicle, e.g. trucks, buses, etc. (c)    Electric vehicle which use battery to drive. (d)   Steam vehicle, e.g.
next page