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What is the range of helix angle in herringbone and double helical gears?
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Difference between herringbone gears and double helical gears?
they have no difference.. they are same
Why is double helix structure of DNA important?
#Herringbone gears are a type of double helical gear, meaning that they have both a left hand and right hand element to cancel thrust or side loading on their bearings. A true herringbone has a 30° helix angle, 20° transverse pressure angle, and an AGMA stub whole depth factor. They may have a center groove between the two hands, but this is not absolutely necessary. Herringbone gears are cut on specialized machines that cut both hands at the same time, precisely locating the apex of the two helixes.#The double helical form balances the inherent thrust forces.[Double helical gears, invented by André Citroën and also known as herringbone gears, overcome the problem of axial thrust presented by 'single' helical gears by having teeth that set in a 'V' shape. Each gear in a double helical gear can be thought of as two standard, but mirror image, helical gears stacked. This cancels out the thrust since each half of the gear thrusts in the opposite direction. They can be directly interchanged with spur gears without any need for different bearings.Where the oppositely angled teeth meet in the middle of a herringbone gear, the alignment may be such that tooth tip meets tooth tip, or the alignment may be staggered, so that tooth tip meets tooth trough. The latter type of alignment results in what is known as a Wuest type herringbone gear.With the older method of fabrication, herringbone gears had a central channel separating the two oppositely-angled courses of teeth. This was necessary to permit the shaving tool to run out of the groove. The development of the Sykes gear shaper now makes it possible to have continuous teeth, with no central gap.]#Double helical gears give an efficient transfer of torque and smooth motion at very high rotational velocities.#A disadvantage of herringbone gears is the high cost due to special gear shaping equipment and special cutting tools.-Also during assembling a gear box ,aligning is to be given special attention
Herring bone gears used when it required that?
herringbone gears are used when the speed requirement is even higher than that can be taken by the helical gears and they are even more noiseless and vibration free. This is because the bending moment that gets induced in the gear shaft of a helical gear is neutralised by another force acting against it in a herringbone gear.
What is a helical gear?
A helical is a spur gear with an angle along the face to increase the gear contact ratio. The gear teeth are cut at angles http://www.motioncontrolguide.com/learn/faqs/gearboxes-and-gears/helical-gears/what-is-the-difference-between-a-helical-gearbox-and-a-straight-gear-tooth-gearbox/ hope this helps
Why are helical gears more favourable than spur gears?
bevel gears are used for power transmitting between the shafts which intersect at some angel ( usually right angel) , but the spur gear is used for shafts which are parallel and coplanar.
What is the difference between helical gear and screw?
Spur gears have straight teeth while helical gears have curved teeth. Generally, helical gears are usually quieter and smoother in operation, while spur gears are easier to make and much less expensive.Helical gears are stronger than spur gears.
Is planetary gears used for spur gear?
Planetary gears can be spur or helical gears.
What are the types of gears used in automobiles?
mostly helical gears !1.
What is the name of the gear system in which axial thrust is absent?
A Herringbone Gear consists of a pair of helical gears, arranged so that they form a vee shaped tooth. Thus there is no axial load, and no need for an axial bearing.This is also the origin of the vee shape in the radiator grille of the Citroen car. For Andre Citroen was involved in the manufacture of such gears.
What are helicle gears?
helical gears offer a refinement over spur gears. The leading edges of the teeth are not parallel to the axis of rotation, but are set at an angle. Since the gear is curved, this angling causes the tooth shape to be a segment of a helix. The angled teeth engage more gradually than do spur gear teeth. This causes helical gears to run more smoothly and quietly than spur gears. Helical gears can be meshed in a parallel or crossed orientation. The former refers to when the shafts are parallel to each other; this is the most common orientation. In the latter, the shafts are non-parallel. For a crossed configuration the gears must have the same pressure angle and normal pitch, however the helix angle and handedness can be different. The relationship between the two shafts is actually defined by the helix angle(s) of the two shafts and the handedness, as defined: : : Where β is the helix angle for the gear. The crossed configuration is less mechanically sound because there is only a point contact between the gears, whereas in the parallel configuration there is a line contact. Quite commonly helical gears are used with the helix angle of one having the negative of the helix angle of the other; such a pair might also be referred to as having a right-handed helix and a left-handed helix of equal angles. The two equal but opposite angles add to zero: the angle between shafts is zero -- that is, the shafts are parallel. Where the sum or the difference (as described in the equations above) is not zero the shafts are crossed. For shafts crossed at right angles the helix angles are of the same hand because they must add to 90 degrees.
What is the difference between spur gears and other gears?
Spur gears are cut with straight teeth. They can only transmit rotation between parallel shafts, and are relatively economical. Bevel gears have teeth cut on an angle. They transmit rotation between non-parallel shafts. Helical gears have curved teeth. They are generally quieter than spur gears, but are generally more difficult to make and more expensive.
Why are helical gears most often used for light-duty passenger vehicles?
Car
