They connect parallel shafts, have involute teeth that are parallel to the shaft and can have internal or external teeth. They cause no external thrust between gears. They are inexpensive to manufacture. They give lower but satisfactory performance. They are used when shaft rotates in the same plane.

Characterstics
The speed and change of the force depends on the gear ratio, the ratio of number of teeth on the gears that are to be meshed. One gear among the two is on the input axle, the axle of the motor and the other gear of the pair is on the output axle, the axle of the wheel.

Applications
Generally used in simple machines like washing machines, clothes dryer or power winches. They are not used in automobiles because they produce sound when the teeth of both the gears collide with each other. It also increases stress on the gear teeth. They are also used in construction equipment, machine tools, indexing equipment, multi spindle drives, roller feeds, and conveyors.

Materials
They are available in plastic, non-metallic, brass, steel and cast iron and are manufactured in a variety of styles. They are made with many different properties. Factors like design life, power transmission requirements, noise and heat generation, and presence of corrosive elements contribute to the optimization of the gear material

They connect intersecting axes and come in several types. The pitch surface of bevel gears is a cone. They are useful when the direction of a shaft's rotation needs to be changed. Using gears of differing numbers of teeth can change the speed of rotation. They are usually mounted on shafts that are 90 degrees apart, but can be designed to work at other angles as well.

Types

The teeth on bevel gears can be straight, spiral or bevel. In straight bevel gears teeth have no helix angles. They either have equal size gears with 90 degrees shaft angle or a shaft angle other than 90 degrees. Straight bevel angle can also be with one gear flat with a pitch angle of 90 degrees. In straight when each tooth engages it impacts the corresponding tooth and simply curving the gear teeth can solve the problem. Spiral bevel gears have spiral angles, which gives performance improvements.

Applications

A good example of bevel gears is seen as the main mechanism for a hand drill. As the handle of the drill is turned in a vertical direction, the bevel gears change the rotation of the chuck to a horizontal rotation. The bevel gears in a hand drill have the added advantage of increasing the speed of rotation of the chuck and this makes it possible to drill a range of materials.

The bevel gears find its application in locomotives, marine applications, automobiles, printing presses, cooling towers, power plants, steel plants, defence and also in railway track inspection machine. They are important components on all current rotorcraft drive system.

Helical gears connect parallel shifts but the involute teeth are cut at an angle to the axis of rotation. Two mating helical gears must have equal helix angle but opposite hand. They run smoother and more quietly. They have higher load capacity, are more expensive to manufacture and create axial thrust.

Gear Configuration

They can be manufactured in both right-handed and left-handed configurations with a helix angle to transmit motion and power between non-intersecting shafts that are parallel or at 90 degrees to each other. For shaft at 90 degrees, the same helix angles are used and the tooth contact area of the gear is very small. If the angle of gear teeth is correct, they can be mounted on perpendicular shaft by adjusting the rotating angle by 90 degrees. The inclination of the teeth generates an axial force. As the angle of inclination increases the axial force also increases. Thrust bearings can counter these forces.

Applications

These are highly used in transmission because they are quieter even at higher speed and are durable. The other possible applications of helical gears are in textile industry, blowers, feeders, rubber and plastic industry, sand mullers, screen, sugar industry, rolling mills, food industry, elevators, conveyors, cutters, clay working machinery, compressors, cane knives and in oil industry.

Spiral bevel gears have spiral angles, which gives performance improvements. They are designed for an angle change of 90 degrees, where the two axes are concurrent and in the same plane. These gears have a double function of being helical and beveled at the same time. The contact between the teeth starts at one end of the gear and then spreads across the whole tooth. In this type of gears the shaft must be perpendicular to each other and must be in the same plane.

Methods of Manufacturing
Face milled and face hobbed are two methods of manufacturing for spiral bevel gears. In the method of face milled, the grinding of the contacting surface is the last step. Whereas, in the face hobbed method, hard cutting is the final step. The same machine is used to rough cut and finish cut the gears. The desirable design of the gear is to minimize the weight of the gear and it is done by reducing the material in the gear's rim.

Applications
Spiral bevel gears are important components on all current rotorcraft drive systems. These components are required to operate at high speeds, high loads, and for an extremely large number of load cycles. In this application, spiral bevel gears are used to redirect the shaft from the horizontal gas turbine engine to the vertical rotor. They are also used in power windows and power seats. They are used where speed and strength are desirable along with the change in angle of power flow.

Gearbox is defined as a metal casing in which a train of gears is sealed. Gearbox is also called gearhead, gear reducers or speed reducers. They are available in broad range of sizes, capacities and speed ratios. Their job is to convert the input provided by a prime mover into an output of lower RPM and correspondingly, higher torque.
Gearbox is intended to be incorporated in a transmission for vehicles, particularly terrain vehicles, preferably driven by an internal combustion engine.

Types of Gearbox

There are two types of gearboxes:

1)Automatic gearbox:

Several factors have contributed to the development of automatic gearbox. Firstly, the advent of electronics in the nineties and secondly, the wish of having more gear speed. It is used for power transmission and offers automatic gearshift. Automatic gearboxes are easy and pleasurable to drive. The only thing to be done after engaging a gear is to press the accelerator to go and press the brake to stop. The automatic gearboxes relies on hydraulic fluid pressure to shift the gears up and down. This fluid needs to be checked regularly.

2)Manual gearbox:

Manual gearbox has widely spread into the market but Europeans still remain faithful to manual gearbox. The manual gearbox has been as old as the car itself. These gearboxes use conventional clutch that is activated each time a gear is selected by an electronically controlled motor. This then disengages the clutch, the gear is shifted and the clutch engages once more. It all happens within a second and the system even allows for the car to come to a stop whilst still in gear. The manual gearbox is virtually maintenance free except for the checking of the oil level occasionally.

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We offer a wide range and various types of Gears, like:

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