Helical Gear

Mechanical drives are used to transmit motion, torque and power from a driver shaft to driven shaft. The driver shaft, in majority of the cases, is a part of prime mover (such as electric engine, hydraulic turbine, steam turbine, etc.); while, the powered shaft is part of the machine unit. There exist four fundamental mechanical drives, namely gear drive, belt drive, chain drive and rope drive. A equipment drive is one engagement type rigid drive where movement and power are transmitted by way of successive engagement and disengagement of tooth of two mating gears. It is inherently free from slip and this it offers continuous velocity ratio (positive drive). It can be utilized for light duty applications (such as toys, watches, etc.) as well as for heavy duty applications (such as gear box of machinery, marine drive, etc.).

Driver and driven shafts might have three mutual orientations, namely (we) parallel shafts, (ii) intersecting shafts and (iii) non-parallel nonintersecting shafts. There exist four basic types of gears and a suitable gear should be selected based on the mutual orientation of the driver and driven shafts. Spur equipment and helical gear are applicable for parallel shafts. Bevel equipment can be requested two intersecting shafts, which might not always be perpendicular. Worm gear arrangement is used for the 3rd category (nonparallel nonintersecting shafts). Unlike spur gears which have straight teeth parallel to the apparatus axis, helical gears possess the teeth in helical form that are cut on the pitch cylinder. Although helical gears are generally utilized for parallel shafts like spur gears, it can also be utilized for perpendicular but non-intersecting shafts.

Accordingly right now there are two types of helical gears-parallel and crossed. Parallel helical gears, the common one, is utilized to for power transmitting between parallel shafts. Two mating parallel helical gears should have same module, same pressure position but opposite hand of helix. They offer vibration-free and quiet procedure and will transmit heavy load. However, crossed helical gears are utilized for nonintersecting but perpendicular shafts. Two mating crossed helical gears (also known as screw gears) should have same module, same pressure position and either same or opposite hand of helix. This type of gear has software similar to worm equipment; however, worm equipment is preferred for steep speed reduction (1:15 to 1 1:100), whereas crossed helical gears cannot offer acceleration reduction beyond 1:2. Various differences between parallel helical gear and crossed helical equipment are given below in table format.

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As one of leading manufacturers, suppliers and exporters of mechanical products in China, We offer reducers, sprockets, industrial and conveyor chain, belts, pulleys, gears, racks, gearboxes, motors, PTO Shafts, taper lock Bushing, vacuum Pumps, screw air compressors and many other products. Please contact us for details.

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