Join our newsletter and stay up to date on the latest innovations and product updates. NL DE. Comparison of hypoid, helical bevel and worm gear motors. Comparison of right angle transmissions. Worm Gear Motors. Self-braking In the other direction, the combination is self-braking. Universal solution Worm gear motors are characterized by high quality, compactness and a universal design.
Applications Food industry Conveyors Agricultural and horticultural systems Marine and offshore Systems with self-braking capability Advantages Compact and universal design Economical Self-braking with certain gear ratios Also available in stainless steel or with a stainless steel hollow shaft Sturdy and quiet solution. Hypoid Gear Motors. Efficiency Unlike conventional worm gear transmissions where significant losses occur due to high sliding resistance between the worm and the worm wheel, hypoid gear units have mainly rolling resistance between the gears.
Energy-efficient alternative The hypoid gear unit differs from the worm gear unit in terms of energy efficiency, especially with higher gear ratios. Applications Food industry Large gear ratios in limited space Conveyors Energy-efficient alternative to worm gear units Agricultural and horticultural machinery Advantages High efficiency Very high gear ratios Directly interchangeable with conventional worm gear units Less vibration and low noise level Interchangeable flanges, couplings and shafts.
Helical Bevel Gear Motors. Efficiency Optimal gear geometry and high machining accuracy result in a transmission where the teeth always mesh nicely and the rolling resistance is minimal. Long life The higher the efficiency, the less heat and wear on the gears, bearings and seals.
Efficiency versus type of right angle transmission. Transmission type. Worm gear. Hypoid gear. Helical bevel gear. Mainly rolling. Heat generation. Noise level. View products. To products. Producer, manufacturer and supplier of right angle gear motors. Stainless steel right angle gear motors. BEGE right angle gear units and gear motors. V Serie - Bevel Gear Units. H Serie - Hypoid Gear Units. Comprehensive solution. Power transmission either between two parallel shafts or between two intersecting shafts or between two perpendicular non-intersecting shafts may be desired in various cases.
A particular type of gear is specifically suitable for any one arrangement between driven and driven shaft. For example, spur gear or helical gear are suitable when driver and driven shafts are parallel to each other. Suitability of four types of gear based on relative orientation of driver and driven shafts are discussed below. Helical gear — It is used to transmit motion and power between two parallel shafts. Crossed helical gears can be employed for non-parallel shafts usually perpendicular ; however, are rarely used.
Bevel gear — It is used to transmit motion and power between two intersecting shafts not necessarily be perpendicular. Worm gear — It is used to transmit motion and power between two non-intersecting shafts, which are usually perpendicular to each other.
Mating of two gears imposes force on bearings. These bearings provide support to the driver and driven shafts and ensure correct position. They take up the forces that are acting on the shaft and subsequently transmit them to the ground via frame or casing. A suitable bearing is selected based on numerous factors, notably type and magnitude of force acting on it and rotational speed. Gear drive can impose radial force acts radially towards centre from the mating point and thrust force acts along gear axis.
Spur gear — Since the teeth are parallel to the gear axis, it imposes only radial force to the bearings. No axial thrust force is produced here. However, gear teeth are subjected to a tangential force. Helical gear — Since the teeth are inclined at helical angle to the gear axis, it imposes both radial force and axial thrust force on the bearings. However, double helical gear is free from thrust force. Tangential force acts on the gear teeth as usual.
Bevel gear — It also produces both radial force and axial thrust force. Additionally tangential force acts on the gear tooth. Worm gear — Even though the teeth of the worm wheel are straight and parallel to the gear axis similar to spur gear , both worm and worm wheel impose radial force and thrust force on the bearings.
Tangential force acts on the teeth as usual. It is worth mentioning that friction force is significant in worm gear drive because of sliding contact between teeth unlike rolling contact in other gear drives. Friction force changes radial force and thrust force substantially. Since gear is an engagement drive, so teeth of two mating gear successively mesh in a particular fashion. This meshing style has great impact on overall performance of gear drive. It can influence a number of factors including force, vibration, noise, heat generation, tooth wear, service life, and efficiency.
Meshing style primarily depends on the orientation of teeth with respect to gear axis, as discussed below for each of the four basic gear types. Spur gear — Teeth of two mating spur gears, having straight tooth parallel to the gear axis and mounted on parallel shafts, come in sudden contact over the entire face width. Contact between two meshing teeth is always a straight line of length equals to gear teeth width.
Sudden contact imposes impact or shock load on teeth. Helical gear — Here contact between teeth of two mating gears occurs gradually. Initially engagement starts with a point and gradually it becomes a line and thereafter it starts disengaging in reverse way. A gradual load acts on teeth. Bevel gear — Based on gear teeth type, engagement condition and load varies. Motor costs are calculated using a US Department of Energy website which identifies a national average industrial power rate of 6.
As center distance grows, efficiency improves, as seen here where the rise in efficiency for seven center distances is at a ratio. Based upon market prices and catalog stated efficiencies, the payback time for low HP applications can be long. That converts to less than a penny per hour of operation.
At that rate it would take more than , hours of operation to recover the difference in costs between the two. As noted, the higher the ratio, the lower the efficiency of the gearbox. Even in this instance, the purchase price differential between a helical and a worm gearbox is high enough that the time to make up the cost difference would be 48, hours. This chart shows the potential dollar cost to operate a motor at full-load current for an 8-hour shift using a standard ac motor. The crossover point, where it becomes more efficient to use helical rather than worm gearboxes, is at the 10 HP range with ratios above But, as ratios rise, the relative efficiency decreases and, in higher ratios, the purchase cost and efficiency ratings both show that the helical gearboxes may be a more cost-efficient design at both purchase and cost of use.
The purpose of these examples is not to imply that worm gearboxes are more suitable than helical gearboxes in all applications.
You will find that in applications requiring higher torque for example 10 HP at a ratio , a helical reducer generally provides a better solution. In this example, the difference in efficiency plays a larger role in the TCO calculation and allows for the capability to downsize.
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