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Articles About worm


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1 The Development of Worm Drives (February 2018)

A worm drive is a geared power transmission device in which a worm meshes with a worm gear to transmit power between two non-intersecting shafts that are oriented at a right angle. The worm drive has been an active and challenging topic of technological study since Leonardo da Vinci (1452-1519).

2 Evolution of Worm Gear Standards and their Consequences on Load Capacity Calculation Approach (September 2014)

Beginning with a brief summary and update of the latest advances in the calculation methods for worm gears, the author then presents the detailed approach to worm gear geometry found in the revised ISO TR 10828. With that information, and by presenting examples, these new methods are explained, as are their possibilities for addressing the geometrical particularities of worm gears and their impact upon the behavior and load capacity of a gearset under working conditions based on ISO TR 14521 — Methods B and C. The author also highlights the new possibilities offered on that basis for the further evolution of load capacity calculation of a worm gearset based on load and contact pressure distribution.

3 Worm Gear Cutting (August 2016)

I have a fairly straightforward question about a worm gear segment. But as of yet, I haven’t gotten a straight answer from any of the gear job shops I’ve approached about this job. Is there a "traditional" gear cutting method that can produce a ~180 degree enveloping worm gear segment when a feature on the back of the part will interfere with a complete rotation of the part? Or am I left with only the option of 4- or 5-axis surfacing with a CNC mill? I have presented this part to several well-known gear shops in the U.S. without a straight answer on how the part can be made. Any help you could offer would be appreciated.

4 Load Capacity and Efficiency of Grease-Lubricated Worm Gears (September 2014)

Varying installation requirements for worm gears, as, for example, when used in modular gear systems, can necessitate grease lubrication - especially when adequate sealing for oil lubrication would be too complex. Such worm gears are being increasingly used in outside applications such as solar power plants and slew drives. While knowledge about the operating conditions is often appropriate, the basic understanding for load capacity and efficiency under grease lubrication is quite poor. Investigations done at FZG and sponsored by FVA/AiF are shown here to give an impression of the basic factors of load capacity and efficiency. The results of the investigation indicate a satisfying quality of calculations on heat, load capacity and efficiency based on characteristic parameters of the base oil with only slight modifications to the methodology known from DIN 3996 or ISO TR 14521.

5 Efficiency and Heat Balance Calculation of Worm Gears (December 2020)

If torque conversion with high gear ratio, compact installation space and 90-degree axis-crossing angle is needed, often worm gears are used. Due to their high power density and sliding speeds within the tooth contact, frictional heat and thermal stresses are higher compared to helical, bevel and hypoid gears, and thus the thermal load capacity of worm gears is lower.

6 Lubrication of Plastic Worm Gears (August 2019)

In the selection of lubricating greases for plastic worm gears, the user needs to know the influence of each grease constituent on the tribological performance in order to choose the appropriate lubricant. In this work, the effect of NLGI class, viscosity, base oil and thickener type are investigated separately regarding the efficiency and temperature close to the tribocontact. With the help of this contribution the user understands the effect of each parameter and learns about the potentially reachable efficiency and temperature ranges.

7 A New Standardizable Calculation Method to Predict the Efficiency of Worm Gear Drives (March 2018)

In this work a physically based method for the tribological investigation of worm gears is presented.

8 Mathematical Modeling for the Design of Spiroid, Helical, Spiral Bevel and Worm Gears (April 2015)

Spiroid and worm gears have superior advantages for hightorque and miniaturization applications. And for this reason they are particularly preferred in aerospace, robotic and medical applications. They are typically manufactured by hobbing technology, a process with a typical overall lead time of 4 to 14 weeks.

9 Calculation of the Efficiency of Worm Gear Drives (June 2015)

This paper presents a physically grounded calculation method to determine the efficiency of worm gear drives. This computation is based on the Institute of Machine Elements, Gears, and Transmissions (MEGT) tribological simulation, which can determine the local tooth friction coefficients (Ref. 1). With this knowledge other power losses such as the bearings, oil churnings and seals power losses can also be calculated.

10 Mold Machining Center Maintains Accuracy (June 2008)

Entrust enlists Advanced Machine & Engineering for 7-axis, 2-spindle performance.

11 Mayr Provides Shaft Couplings for Torque Transducers in FZG Worm Gear Test Stands (April 2021)

For reliable and accurate measurement results, The connection of the measuring shafts used is of particular importance.

12 Two-stage Helical Bevel Gearing (February 2016)

Gearing is an essential component in conveyors. The material handling industry appears divided between those who favor high-end three-stage helical bevel gearboxes and those who rely on less expensive worm gearing. But there’s an often over-looked alternative, the two-stage helical bevel gearbox.

13 Mutiple Gearset-Type Calculation Software (September 2015)

Is there a gear software package out there that will calculate the design of spur, helical, worm, and planetary gearsets? Also, we would like a program that calculates stresses and material selection. Finally, we would like to have the program calculate bearings loads, too. Thank you for your help.

14 Product News (April 2013)

SKF energy-efficient bearings, Bishop Wisecarver guided motion system, Weiss torque rotary table, Mico wireless braking system, Nord worm gear series, and SKF expanded range of couplings.

15 NORD Gear Offers Drive Solutions for Intelligent Brewing (September 2019)

Worm, bevel, and parallel shaft gear units were installed at two breweries to provide the necessary process control.

News Items About worm

1 Nord Releases Worm Gear Series (March 6, 2013)
Nord Drivesystems now offers a new range of worm gear units in a robust, one-piece UNICASE housing in five sizes with a maximum torque of...

2 Worm and Spur Gears, English and Metric (May 30, 2007)
SDP/SI is an ISO 9001 manufacturer of over 13,627 spur gears, plastic gears, helical gears, bevel gears, worm gears, precision gears, int...

3 Varvel Offers RS and RT Series Worm Gearboxes (January 19, 2018)
The Varvel RS and RT series worm gearboxes demonstrate the company’s versatility and innovation for a variety of demanding applicat...

4 Nord Expands Helical Worm Gear Line (July 20, 2018)
Manufacturers across a several industries will benefit from Nord Drivesystem’s newest helical-worm gear unit. The redesigned two-st...

5 Flowserve Introduces New Models to PT Series Worm Gears (April 13, 2005)
Flowserve Corp., a provider of fluid motion and control products and services, added two new sizes to the Flowserve Limitorque PT series ...

6 Boston Gear Introduces New Worm Gear Reducer (January 10, 2006)
A new 700 Series Conveyor Flange Adapter (CFA) is specifically designed for increased control and lower maintenance cost on material hand...

7 New Website Launched by Delroyd Worm Gear (October 19, 2010)
Delroyd Worm Gear has launched a new corporate website which provides information about their full product line including helical single,...

8 Aerotech Worm Gear Stages Offer Improvements (March 14, 2013)
AGR series motorized rotary stages provide significant improvements in speed, load capacity and long-term positioning performance over pr...

9 Nord Offers Bevel Gear Alternative to Worm Gear Units (November 27, 2018)
With the two-stage NORDBLOC.1 bevel gear unit, Nord launched high performance, washdown-optimized aluminum drives for hygienic applicatio...

10 Tsubaki Launches Troi and Worm Drive Reducers (May 21, 2013)
Tsubaki Europe has launched a new range of Troi Drive and Worm Power Drive reducers which benefit from an improved oil seal design for re...

11 Regal Beloit Worm Gear Reducer Receives IP69K Certification (February 12, 2020)
Regal Beloit Corporation has announced that its Grove Gear Stainless Steel Worm Gear Reducer has achieved third party IP69K certification...

12 Dunkermotor Releases Wormetary Gearmotor Configuration (July 19, 2012)
To meet the needs of OEMs requiring a high torque, low output speed non-backdrivable gearmotor without sacrificing energy efficiency, Dun...