TYPES OF GEARS :
Everyone who want to begin their career in robotics must have grip on 3 parts of engineering
In this article I am going to share you basics of mechanics on types of gears which is essential for a beginner in robotics.
Gears are the essential things in a mechanical part for the transmission of motion .
Gears are wheel-like machine elements that have teeth uniformly spaced
around the outer surface. They are used in pairs and are a very valuable
What is a gear?
A gear is a toothed cylindrical or roller shape component of a machine which meshes with another toothed cylindrical to transmit power from one shaft to another. It is mainly used to change in torque and speed of driving shaft and driven shaft.
According to the type of gearing. The gears, according to the type of gearing, may be
classified as :
(a) External gearing, (b) Internal gearing, and (c) Rack and pinion.
Let us see each of them briefly
In simple language we can say that gears having teeth over its inner side of the body as shown in figure below; the gears of the two shafts mesh internally with each other.
Rack and pinion:
Rack is a gear of infinite radius . The smallest of the mating gear is known as pinion.
It is used to convert the linear motion to rotatory or vice versa.
Lets see the real life pictures of the above types:
Some basic terms used in gears:
1. Pitch circle: It is an imaginary circle which by pure rolling action, would give the same motion as the actual gear.
2. Addendum: It is the radial distance of a tooth from the pitch circle to the top of the tooth.
3. Dedundum: It is the radial distance of a tooth from the pitch circle to the bottom of the tooth.
BASIC FORMULA FOR THE CALCULATION OF SPEED OF GEARS FROM TOOTH RATIO AND VICE VERSA
T1=number of teeth on 1st gear
T2=number of teeth on 2nd gear
V1=speed of the 1stgear
V2=speed of the 2ndgear
This is simply derived by relation that speed of gear is inversely proportional to the no. of teeth present on it.
LET US DISCUSS SOME OF THE IMPORTANT GEARS USED IN THE MECHANICAL PARTS OF THE ROBOTS
- Spur gear:
- Double helical gear:
- Bevel gear:
Bevel Gears are used exclusively to transmit rotary motion between intersecting shafts. Through commonly seen in right angle drives, bevel gears can be cut to drive any angle.
- Crown gear:
A crown gear is a gear which has teeth that project at right angles to the face of the wheel.
- Worm gear:
- Rack and Pinion:
Rack is a gear of infinite radius .The smallest of the mating gear is known as pinion.
This was very basic introduction about gears used in robots and in next articles i will deal about more mechanical, electronic and programming parts of the robots.
Have fun with the content and feel free to ask any doubts.