In This Article, we will learn about different types of Gears and their uses in various applications. A Gear is a rotating element that has teeth machined on the surface of a solid shaft. When two gears mesh with each other it transmits circular Motion simultaneously altering the speed of Rotation. The working Principles of Gear are there are two types of Gears i.e. Driving Gears and Driven Gears. The Driving Gear gets the rotational Input and Transmits it to driven Gear and thus the whole purpose of the Gearing System is to transmit Rotary motion.
Types Of Gears :-
There are different ways to classify Gears, The most common way is to categorize on the basis of its type. Gears are classified into 3 types; Parallel Axis Gear, Intersecting Axis Gear and Non-Parallel Non Intesecting Acting gear. Spur and Helical come in the category of Parallel axis gears and Bevel gears fall in the category of Intersecting acting Gears.
A simple rolling movement can be observed during the meshing of Paired parallel axis Gears or Intersecting axis gears due to which it has relative minimal slippage and their efficiency is high. On the other hand non parallel and non intersecting gears such as screw gears and Worm gears produce relative slippage while transmitting power as a result friction between two Gears can be observed which causes power losses and indeed the efficiency gets low.
Great efficiency of Gear can be obtained only when the installation is done accurately. Similarly in Bevel gearsets the efficiency will decrease if the mounting of the Gears isn’t done properly that is mounting, off position to the cone-top. In general Theoretical efficiency of these Gears does not include Bearing and lubricating losses.
§ PARALLEL AXIS GEARS
1) SPUR GEAR.
It is a Cylindrical Shaped Gear where the teeth are parallel to the axis of the Gear and it is most commonly used in Planetary Gearsets.
2) SPUR RACK.
It is linear Rectangular shaped bar on which gears Teeths are machined on the surface of a single side which can mesh with a spur Gear. This is used to convert Rotary Motion into linear Motion
3) INTERNAL GEARS.
It is similar to the Spur gear the only difference is the teeths are machined inside a circumferential Ring. It is meshed with a Spur gear for Reduction purpose by rigidly fixing either the Internal gear or the Spur Gear. This Gear is often used in Planetary gear System.
4) HELICAL GEAR.
It is a Cylindrical shaped Gear with a teeth formation known as Helicoid Teeth in load bearing comparison. Helical Gears can bear more load than spur Gears and the noise produced while operation is less.
5) HELICAL RACK.
This is Linear shaped Gear that meshes with a Helical Gear. The only difference Between Spur Rack and Helical Rack is Spur Rack has Straight teeths and Helical Racks teeth are machined at an specific angle.
§ INTERSECTING ACTING GEARS
1) STRAIGHT BEVEL GEAR.
Straight Bevel Gear have Tapered conical Teeths which has the same direction as the pitch cone base line. This Type of Gearset is widely used to transmit motion in the axis perpendicular to each other i.e. 90 degree.
2) ZEROL BEVEL GEAR.
This is a special type of Gearset known as spiral Bevel gear. This Spiral angle in the particular gearset is Zero degree due to which the force acting upon the same.
3) SPIRAL BEVEL GEAR.
This Bevel gears comes with a helical angle of Spiral teeth. It offers higher Strength and low noise.
§ NON PARALLEL AND NON INTERSECTING AXIS GEARS.
1) CYLINDRICAL WORM GEAR PAIR.
Worm Gear pair consist of a worm and a worm wheel meshing with each other which has non parallel and non intersecting axis. The Key feature for worm and worm wheel Gearset is is that we can obtain a very high reduction ratio in a single mesh also it has quiet and smooth motion.
2) SCREW GEAR.
This type of Non Parallel and Non Intersecting cylindrical gear has teeth on one or both side in the form of screw. This type of Gears is used in a combination with screw gear or Spur Gear. This Type assures smooth and quite operation however are not suitable to transmit high power.
GEAR TRAINS :-
Power cannot be transmitted using a single Gear hence atleast two or more than two gears is to be meshed to transmit the motion. This combination of Gears working together is called as gear Train. There are Two Stages in gear Train i.e. Single Stage Gear Train and Two Stage Gear Train.
SINGLE STAGE GEAR TRAIN :-
In a Single Stage Gear train two Gears are meshing with each other to transmit rotary motion simultaneously with reduction of speed.
It is a common case between spur and bevel gear mesh the direction of rotation of driver and driven gear are opposite. On the other hand in case of internal gear mesh both the gears rotate in same direction. In worm mesh the rotation of direction is determine by its helix hand.
TWO-STAGE GEAR TRAIN :-
In two stage gear train two single stage gearsets are combined in a series to get a combined reduction ratio. In this gear train the smaller gear is the driving gear and the largest one is the driven gear. The rotational motion is transmitted through the intermediate gear placed between the driving and the driven gear. The intermediate gear also known as Idler. And if the idler gear and the driven gear has same number of teeth, there is no effect on the speed ratio.
All the above factors are considered in the Research and Development Procedure of SMD Gearbox due to which SMD can deliver High Precision and High Accuracy Gearboxes suitable according to customer requirements. Because of R&D procedure, the NVH level of the Gearbox can be altered and reduced to avoid fatigue level on workers or employees and hence indeed increase Efficiency and Productivity. Frequent testing of Gears is carried out before assembly like Gear Roller Testing, Noise Inspection, Hardness Testing, Concentricity Testing, Torque Inspection etc. SMD Gearbox is considered to be Best Solution Provider for all types of Servo Gearboxes in the Indian and Global Market. SMD Gearbox are widely used in Automation, Automobile, Pharmaceutical, Aerospace, Engineering, Medical, Agriculture, Machine tool, etc. Industries.
One of the main transmission mechanisms most used in all mechanical projects.
The worm offers simple operation and mechanical advantages.
The worm meshes with the helical gear in such a way that the helical gear rotates with a single tooth each time the worm rotates completely.
Therefore, for the helical gear to rotate completely, the worm must be rotated by the number of teeth of the helical gear.
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