For the love of physics walter lewin may 16, 2011 duration. Cone drive serves an entire spectrum of mechanical drive applications from packaging, material handling. Load distribution in double enveloping worm gears journal of. The electromechanical operation of the helical broach machines removes the danger of hydraulic fluid spills and contamination while extending the service life of the machines and. Cone drive is capable of designing and manufacturing precision gearing solutions for many applications. Early worm gearing was made of wood, or wood and metal. Double enveloping worm gear sets gear equipment scribd. New type of ground double enveloping worm gear drive. Stress analysis in double enveloping worm gears by finite. If you are using a double enveloping sometimes called hourglass worms the axial positioning of the worm is critical as well. Gear types, spur, helical, bevel, rack and pinion, worm. Mathematical description of tooth flank surface of globoidal worm.
Relief grinding of planar doubleenveloping worm gear hob. Featuring a doubleenveloping worm design, maxtorque worm gear products. This technical manual is written as an aid for the designer who is a beginner or. The double enveloping worm gear has a radial changing pitch diameter. There are four worm tooth profiles in jis b 1723, as defined below. Mathematical description of tooth flank surface of. Request pdf geometrical aspects of double enveloping worm gear drive double. Jinge wang and guanghui zhang another class of novel worm drive, which with. Cone drive is a world leader in double enveloping worm gear technology, which delivers drive solutions with the highest torque and shock load capacity in the smallest amount of space. N2 a method and a corresponding computer program are developed for stress analysis in the worm and the gear of double enveloping worm gears by finite elements. It is mostly used as a speed reducer, which consists of worm and worm wheel or gear.
This book is an attempt to apply that principle to gear design by presenting information from a manufacturing pointofview rather than a theoretical one. For cutting a double enveloping worm, a trapezoidal tool set in axial plane is used with its edge always tangential to base circle while moving in a circular path concentric to gear axis. Doubleenveloping wormgearing comprises enveloping worms mated with fully enveloping wormgears. The mating double enveloping worm gear requires a hob resembling the double enveloping worm with cutting elements lying on the worm surface. Cone drive has extensive experience in many industries. For more than 30 years the book practical gear design, later retitled handbook of practical gear design, has been the leading engineering guide and reference on the subject. These are single enveloping and double enveloping worm gears which differ as regards to the axial profile of the worm. This technical manual is written as an aid for the designer who is a beginner or only. A worm drive is a gear arrangement in which a worm meshes with a worm gear the two. The cylindrical worm gear is the simplest form of worm gear where a straight cylindrical worm engages with a simple helical gear.
Follow up what is the reduction ratio of this gear set. T1 new type of ground double enveloping worm gear drive. The equation of globoid helix and tooth axial profile of worm is derived to determine worm tooth surface. Double enveloping worm gearing is expected to have contact over larger number of teeth and higher load carrying capacity compared to single enveloping worm gearing. Sales 18889942663 sales fax 18889072663 traverse city, mi. The product range includes the model hp, model hpa, series b, duodrive, extruder drive, series w, model rg, series e and series p. N2 on the gear tooth surface of the classical double enveloping worm gear drive with straightlined axial worm profile three sections, with sharp intersections, exist. Double enveloping worm gear this worm set uses a special worm shape in that it partially envelops the worm gear as viewed in the direction of the worm gear axis. Its big advantage over the standard worm is much higher load capacity.
Geometrical aspects of double enveloping worm gear drive. A new type of doubleenveloping worm gear drive was proposed 10, 11. Cone drive is the world leader in double enveloping worm gear. The material in this section has been reprinted with the permission of mcgraw hill book. The kinematic system of globoidal worm gear is shown. Products are available in single and double reductions with ratios ranging from 5. Today, we continue to offer a variety of services to our valued customers to improve productivity and overall operating efficiency within their businesses. Cone drive gears provide higher driving efficiency and higher torque capacity compared to worm gears. Abstractin this article, a mathematical description of tooth flank surface of the globoidal worm and worm wheel generated by the hourglass worm hob with straight tooth axial profile is presented.
Contact simulation of a double enveloping worm gear e. Doubleenveloping worm gear sets precise and powerful custom solutions. Therefore, regardless of the worm s size sensible engineering limits notwithstanding, the gear ratio is the size of the. Cone drive gear sets are available in standard sizes and ratios and in custom sizes and ratios to suit your requirements. Cone drives double enveloping design handles demanding mixer and agitator applications better than traditional worm gearing. Design of a reduction gear using doubleenveloping worm gear. Those having both elements throated double enveloping worm gearing. Cone drive double enveloping worm gearing design and. In a single enveloping set, the worm wheel is cut into a concave surface, thus. However, the worm gear is very complicated to design and produce, and sources for manufacture are few.
Socare slew drives are powered with hour glass double enveloping worm technology for increased load handling, efficiency and accuracy. Stevens institute of technology, and author of a large number of. Two other improved forms of worm gearsets also exist. Engineering book store engineering forum excel app. Compared with single enveloping worm gearing, double enveloping worm gearing can provide the same load capacity with a more compact volume and a higher efficiency. Roller enveloping the side worm gear pairs drive is proposed basing on roller enveloping hourglass worm drive. Globoid gear and worm offer software and 3d cad models for globoid gears since 1989 globoid a. The article cone drive double enveloping worm gearing design and manufacturing appeared in the octobernovember 1984 issue of gear technology summary worm gearing is of great antiquity, going back about 2100 years to archimedes, who is generally acknowledged as its inventor.
Things should be made as simple as possible, but no simpler. Worm gear sets may be either single or doubleenveloping. Worm gears require careful attention during assembly. Design and application of small standardized components data book 757. Cone drive is the recognized global leader in the design and production of double enveloping worm gearing, renowned for its durability and precision. Equipped with true double enveloping worm gear technology, these servo speed reducers are industry leading. Cone drive accudrive double enveloping worm gear sets. Pdf theoretical research of roller enveloping the side. Winsmith cline worm gear, a single enveloping drive with a large ration range, integral feet is the industry standard. Introduction to gear design introduction albert einstein once said.
Worm gearing isof great antiquity, going back about 2100 years to archemides, who is. Speed reducer gearbox, industry gearbox manufacturer sgr. In double enveloping worm gear, the teeth profile of the gear as well as the shape of the worm threads are modified to achieve better engagement. You can get more information about sdgs double enveloping worm gear below website. Courtesy of stock drive productssterling instrument. The book is a detailed, practical guide and reference to gear technology. Double enveloping worm gear sets have both members throated and wrapped around each other. This increases the number and amount of tooth shear area. With double enveloping gearing, the worm wraps around the gear, putting up to eight times more teeth area in contact than conventional worm gearing. From the righthand side view of the picture you can see how the shapes of the worm threads have modified in line with the circular shape of the gear teeth. Crossed axis helical gears are not throated, and are sometimes referred to as non enveloping worm gear sets.
Slew drives are an allinone unit comprised of geared slew ring, drive gear, housing, and motor electric or hydraulic. It is now available again in its most recent edition. Worm gearing is of great antiquity, going back about 2100 years to archimedes, who is generally acknowledged as its inventor. Stress analysis in double enveloping worm gears by finite element method. In a singleenveloping set, the worm wheel is cut into a concave surface, thus. Two more cone drive 10 inch centre distance double enveloping worm gear sets create the 12. Sort by date 1 cone drive double enveloping worm gearing design and manufacturing octobernovember 1984. Manufacturing singleenvelope worm gears gear solutions.
Cone drive product catalog and engineering manual 172. Our product range is engineered to enable a high degree of flexibility. This edition includes advances in gear theory, gear manufacturing, and computer simulation. Cone drive gear sets are available in standard sizes and ratios or we can prepare custom worm gear sets to any specifications. Cone patented the applicable technology to manufacture this worm drive 3, 4. Referring to figure 94, for a lead angle g, measured on the pitch cylinder, each rotation of the worm makes the thread advance one lead. Also includes an ebook library of classic texts on mechanical design and engineering. A method for the determination of load sharing among the instantaneously engaged worm threads and gear teeth of double enveloping worm gears and for the.
Gear technology meets environmental challenge with switch. From product modifications to full customization services, our experienced engineering and application support teams are available to work with you. The double enveloping hourglass worm drive was initially invented. Double enveloping worm gear sets worm drive gearbox. Our engineers can recommend the best possible gearing solution to minimize the total cost of ownership. There are no great advances in gear technology described. Cone drive gearing solutions, based in traverse city, michigan, is an industry leader in motion control and industrial power transmission solutions. Tell your friends and customers you were featured in the article cone drive double enveloping worm gearing design and manufacturing. Cone drive is the world leader in double enveloping worm gear technology, which delivers drive solutions with the highest torque and shock load capacity in the smallest amount of space. Just copy one of the highlighted code examples below and paste it into your websites html. Agma, iso, and similar standard groups have produced information on failures and usually classified them as being either wear. New technology for manufacturing quasigloboid worm gearings. However, that the relief grinding of its hob can not be finished automatically till now limits its applications because all of the cutting edges on the hob have different shapes and spiral angles. The double enveloping hourglass worm drive was initially invented approximately in.
The hourglass worm tooth surface equation can be deduced by applying spatial meshing theory and differential geometry theory. If you do not get the gear centered on the worm it will not perform as designed. The design of all types of gears is covered, from those for small mechanisms to large. Cone drive is the world leader in doubleenveloping worm gear technology. New geometry for modified spur and helical gears, face gear drives, and cycloidal pumps. The worm wheel or gear is similar to a helical gear with a face curved to conform to the shape of the worm. In this paper, contact in this gearing is analysed by geometrical simulation of worm gear tooth generation using intersection profiles of different axial sections of worm.
Cone drive double enveloping worm gearing design and manufacturing. Roller enveloping the side worm gear pairs drive means to assembling the roller on the end surface of the worm wheel equally. Double enveloping single threaded worm gear 4 double enveloping multi threaded. New design approaches for one stage planetary gear trains and spiral bevel gear drives. The worm teeth may have a variety of forms, and are not standardized in the way that parallel axis gearing is, but the worm wheel must have. T1 stress analysis in double enveloping worm gears by finite element method.