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Helical Gear full report
Post: #1

Submitted by-
Anvit Agrawal

.pptx  Helical Gear.pptx (Size: 471.56 KB / Downloads: 168)
Helical Gear
What is helical gear ?
Helical gear is the type of gears .
Helical gear is a cylindrical shaped gear with helicoid teeth. Helical gears operate with less noise and vibration than spur gears .
Helical gears can be meshed in a parallel or crossed orientations.
The angled teeth engage more gradually than do spur gear teeth causing them to run more smoothly and quietly
Types of Helical gear-
1. Cross helical gears

Crossed Helical Gears are a type of Helical Gears only. They are the typical example of two helical gears applied for transmitting power between non parallel and non-intersecting shafts.
Manufacturing Cross Helical Gears Generally, the Crossed Helical Gears are offered in four types of materials:     * Steel     * Stainless Steel     * Cast aluminum     * Bronze     * Nylon
2. Double Helical Gears Double Helical Gear is of cylindrical form. It has two sections of teeth, right hand and the other left hand. They operate by engaging themselves simultaneously with the teeth of an identically designed mating gear.
In these Helical Gear the thrust loading is effectively eliminated by usage of two pairs of gears. The tooth angles are opposite to each other. This results in the cancellation of side thrust of one Gear by the other one. These opposite gears are made in a manner for having a space between the two opposing sets of teeth.
Terms used in helical gears:
1. Helix angle:- It is a constant angle made by the helices with the axis of rotation. 2. Axial pitch:- It is the distance, parallel to the axis, between similar faces of adjacent teeth. It is same as circular pitch and is therefore denoted by pc. The axial pitch may also be defined as the circular pitch in the plane of rotation or the diameteral plane. 3. Normal pitch:- The normal pitch of a helical gear is the pitch of the tool used to cut the teeth. It is measured in a plane perpendicular to the direction of the teeth. 4. Transverse Pitch:- The transverse pitch of a helical gear corresponds to the pitch of a spur gear with the same number of teeth and the same pitch diameter. It is measured in the plane rotation of the gear. 5. Normal Pressure Angle:- Normal pressure angle is the pressure angle in the normal plane of a helical gear tooth
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, sugar industry, rolling mills, food industry, elevators, conveyors, cutters, clay working machinery, compressors and in oil industry.
A disadvantage of helical gear is the resultant thrust along the axis of the gear, which needs to be accommodated by appropriate thrust bearings. This can be overcome by the use of double helical gears by having teeth with a 'v' shape.
Helical gears should be properly lubricated to: minimize wear, prevent the generation of excessive heat, improve efficiency through the reduction of friction between the mating tooth surfaces, reduce noise and inhibit the formation of rust. Good lubrication depends on the formation of a film thick enough to prevent contact between the mating surfaces. The relative motion between gear teeth helps to produce the necessary film from the small wedge formed adjacent to the area of contact. It is important that an adequate supply of the correct lubricant is properly applied.
A straight mineral oil lubricant should be used for most parallel shaft applications. Under heavy load conditions, mild extreme-     pressure (E.P.) lubricants are suggested. Helical gears operating at right angles must always be well-lubricated. Extreme pressure (E.P.) lubricants are recommended. Extreme pressure (E.P.) lubricants are not recommended on bronze gears

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