Worm Gear Design Software

Hyperbolic and wormoid gear drives for rotary gear actuaros for automotive steering system and for aerospace flight controls. Globoid Gear technology from ZAKGEAR. By Dr. Stepan V. Lunin. Picture 1. Typical Globoid gear. Davall ISO9001 design, develop, prototype and manufacture gear and geared systems for all military applications. Globoid or Double Enveloping Worm or Hour Glass gear has advantage versus a traditional worm gear because of increased driving efficiency 6 1. The disadvantage of a globoid gear is higher manufacturing cost and sensitivity of the enveloping pinion to the axial location. Due to the geometrical nature of the tooth geometry Globoid pinion can mesh not only with the mating enveloping gear but also with a correctly designed cylindrical helical gear. Using a helical gear with a Globoid pinion is common in reduced cost in applications such as automotive electric powered gear actuators. The significant cost advantage comes due to the possibility to injection mold the helical plastic gear. The load capacity of the simplified helicalGloboid transmission is reduced to the level below the load capacity of the regular worm gear. Bevelhelical gear units. Energy efficiency was a priority when developing the ZAE bevel helical range of gear units. The modular design accepts servomotors and can. However the driving efficiency is still better compare to the regular worm gear. There are just a few suppliers of the Globoid gear. FMm1Y8Vo1FY/hqdefault.jpg' alt='Worm Gear Design Software' title='Worm Gear Design Software' />The most known US supplier of the gears similar to Globoid gear is Cone Drive, division of Textron, located in Traverse City, MI. The detailed information about processes used at Cone Drive for manufacturing of its gear could not be found. However, based on publicly released information it can be understood that the gear is manufactured by CNC milling with use a small ball shaped cutter. ZAKGEAR has capability to design, prototype and supply Globoid gear products. Crown_gear_software.349133957_std.gif' alt='Free Worm Gear Design Software' title='Free Worm Gear Design Software' />The expertise of ZAKGEAR is 3 dimentional simulation and modeling of the Globoid and double enveloping tooth geometry. ZAKGEAR 3 dimentional Globoid and double enveloping gear CAD models can be used in numerous CNC machining shops for producing globoid gear at significantly reduced cost. Picture 2. ZAKGEAR Globoid 3 dimentional CAD model. It has to be noted that manufacturing of the Globoid gear is more complex compare to manufacturing of the Globoid pinion. The Globoid pinion can be produced in high quantities by turning, whirling or grinding. During the machining process of the Globoid pinion the cutting tool has to be capable to tilt in order to produce the enveloping shape. The newer production methods are under development. The most promising production method of the Globoid pinion is continues grinding process, which incorporates a grinding wheel diamond or CBN plated with specific ZAKGEAR simulated geometry. The complication of the novel process is the difficulties with simulation of the geometry of the grinding tool. The grinding tooth would have to generate a correct form of the Globoid pinion without tilting so the production rate and the production cost would be significantly reduced. ZAKGEAR has developed a computer based tool for producing of 3 dimensional CAD models of grinding tools for high volume production of the Globoid products. The most common use of the Globoid gear set was noticed in 1. Italy and in Soviet Union. Picture 3. VAZ 2. Globoid steering technology. The Globoid pinions have been produced by grinding with a tilting grinding wheel. The Globoid gears have been cut by a special hub, which replicated the shape of the Globoid Pinion. Special machines for producing the cutting hubs have been developed. Because the modern automotive steering systems started to use classic Bishop or advanced ZAKGEAR variable ratio rack and pinion technology, the demand for the Globoid gears has been reduced. Variable ratio technology comparison. Ocean Way Drums Gold Crack. Bishop. ZAKGEARVr rack technology was introduced Before 2. Underlying mathematical model is based on Classicgeartheory. Direct. Digital. Simulation. Rack geometry calculation accuracy is Limited by the boundaries of the classic gear theory. Unlimited. Capability to produce the vr rack with not involute form for reduced noise. NOYESCapability to generate vr rack with increased ratio gain is Limited. YESCost of vr rack design is High. Low. Picture 4. ZAKGEAR advanced Variable Ratio rack and pinion high ratio gain technology for motor sport racing applications. Picture 5. ZAKGEAR low noise Variable Ratio rack and pinion not involute technology. ZAKGEAR pioneered in developing of the next generation of Globoid gears. In 1. 99. 9 ZAKGEAR introduced a skew axis Globoid gear as a high load capacity and increased driving efficiency alternative to the classic Globoid gear. Picture 6. ZAKGEAR skew axis wormoid gear. It has to be noted that the name WORMOID does not relate to any scientific term and it is a product of Dr. Stepan V. Lunin, who was the first in proposing this design and, more importantly, he was the first who produces an accurate working model of the gear in 3 dimantional CAD system. The accurate 3 d CAD of the WORMOID gear has proved the capability of the concept such as conjugated transmission action and significant increase of number of teeth in the contact compare to the classic Globoid gear. Picture 7. CAD 3 d model of ZAKGEAR wormoid gear. ZAKGEAR is currently offering assistance for design and development of products based on ZAKGEAR wormoid technology. It has to be noted that wormoid gear design from ZAKGEAR is obviously promising unique advantages compare to the classic Globoid double enveloping gear. One of the obvious advantages is increased load capacity due to increased number of the teeth in the mesh. The gear torque is carried by more teeth so the load on each individual tooth is reduced. The other obvious advantage is increase driving efficiency. As one can see, the portion of the pinion with larger diameter is driving the corresponding portion of the gear, which has a larger diameter as well. Such of unique feature of ZAKGEAR wormoid is missing in the classic Globoid gear and results in higher sliding velocities and higher friction drug on the classic globoid gear. An experienced in the art engineer would immediately derive possible design advantages of the wormoid gear. For example, using of the wormoid gear can significantly reduce cost of electric powered assist mechanisms that are commonly used on modern automobiles. Because of the higher driving efficiency, wormoid gear set can be designed with increase ration and provide the same driving efficiency as the original worm or double enveloping worm gear. For example NSK worm gear steering actuator with a ration of about 2. The plastic gear would hold about 8. Hm of torque. An alternative wormoid gear design from ZAKGEAR would be capable to increase the ratio up to 3. Hm without increase of the center distance between the gear and the pinion. An experienced in the art professional would immediately realize the tremendous potential of using ZAKGEAR technology for improvement of the automotive electric powered actuation steering system. Firstly, with 5. 0 increase of the ration wormoid steering system would allow to use a smaller and lower cost electric motor, which would rotate at 5. RPMSecondly, the cost of the electric controls will be significantly reduces because of 5. RPM electric motor would require about 5. Thirdly, increased load capacity would allow to apply electric powered steering technology, incorporated low cost plastic gears, to larger cars such as pickup trucks and SUVs. Picture 8. ZAKGEAR 3 d CAD model of a reduced performance skew axis enveloping gear.