Duplex Worms Gear
High-precision duplex worms with superior strength. A range of backlash values can be obtained by moving the worm axially.
Duplex Worms Gear
A duplex or dual lead worm is a worm gear(Duplex Worms Gear) set where the two flanks are manufactured with slightly different modules and diameter quotients. As a result, different lead angles on both tooth profiles are obtained so that the tooth thickness continuously increases all over the worm length while the gap between two threads decreases. This allows control of backlash.
At the worm wheel, the different modules result in different addendum modification coefficients and rolling circle diameters at both flanks. Because of this, the profiles are other at the front and the rear side. The thickness of each tooth and the tooth gaps remain constant at the wheel’s circumference.
Backlash adjustment occurs by shifting the worm axially, positioning the section with the required tooth thickness in contact with the wheel to achieve the desired backlash (Fig. 1). This method allows for easy backlash adjustment to any desired value during gear mounting. Even worn gears can be delicately and continuously readjusted without altering the tooth contact or causing meshing interference.
Besides the above-explained duplex method, there are various possibilities to adjust the backlash of worm gears:
- variation of center distance by rotating an eccentric hub, in which the worm shaft and the worm gear wheel are cradled
- axial shifting of a conical worm (fig. 2a)
- division of the worm in two halves (fig. 2b), rotated or shifted relative to each other. (system Ott)
- division of the wheel in two disks (fig. 2c), turned close to each other.
Duplex Worms Gear advantages
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| Fig.1 | Fig.2 |
However, all these methods demonstrate substantial disadvantages:
- adjustments and readjustments are interfering with the geometrically accurate meshing.
- They shift the contact profile zone and change its form and size.
- With this, they decrease the load-carrying capacity and deteriorate efficiency.
- Each adjustment causes a tremendous amount of start-up wear.
- The dangers of improper assembly and destruction of the worm gear set are incredible.
Duplex gearings do not create this kind of problem.
They always ensure geometrically accurate teeth contact and allow very delicate backlash adjustment. The evolved contact area, load-carrying capacity, and actual efficiency influence the performance. Furthermore, duplex teeth, designed as involute gears, remain unaffected by modifications in the center distance, such as those caused by worm shaft deflections.
Point of caution during assembly
Applications
Duplex worms primarily prevent backlash, which can be harmful, by maintaining repeated high precision positioning in both directions, protecting against impulse-loaded damage, and ensuring alternating contact flanks. Typical applications include rotary and tilting tables, milling machines, and presses.
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What Products Do you sell ?
We are a group of factories, give customer one stop solution of power transmission and industrial products. We are in the position to supply wide range of products, including chains, sprockets, v-belt and v-belt pulleys, timing belt and timing belt pulleys, gears, speed reducers, motors, racks, couplings, and many other parts, like locking assembly, taper bushing, Chain guide, shaft collar, torque limiter, cam clutch, universal joint, motor base and motor slide, rod end, clevis, rubber mount, etc. We make special parts according to drawings and/or samples.
How to choose a gearbox which meets our requirement?
You can refer to our catalogue to choose the gearbox or we can help to choose when you provide
the technical information of required output torque, output speed and motor parameter etc.
What information shall we give before placing a purchase order?
a) Type of the gearbox, ratio, input and output type, input flange, mounting position, and motor informationetc.
b) Housing color.
c) Purchase quantity.
d) Other special requirements.
What industries are your gearboxes being used?
Our gearboxes are widely used in the areas of textile, food processing, beverage, chemical industry,
escalator,automatic storage equipment, metallurgy, tabacco, environmental protection, logistics and etc.
What is the producing process?
Production process including raw material cutting, machine processing, grinding, accessories cleaning, assemble, cleaning, stoving, oil coating, cover pressing, testing, package.
How to control the products quality?
Combining advanced equipment and strict management, we provide high standard and quality bearings for our customers all over the world.
What is the transportation?
-If small quantity , we Suggest to send by express, such as DHL,UPS, TNT FEDEX. If large amount, by air or sea shipping.
Can we design packaging?
-Yes. Default is regular packing, and we can make customer's own packing.
Can you provide OEM service?
-Yes, we work on OEM orders. Which means size, quantity, design, packing solution, etc will depend on your requests; and your logo will be customized on our products.
Can you give me discount on Power Transmissions Parts and Industrial parts?
-Yes, of course. Pls. send me your Email, you'll get more
Q: Are You a trading company or a manufacturer?
A: We Are the factory and have our Own trading company
Q: How Can I get an offer?
A: please send US quotation information: drawings, materials, weight, quantity and requirements, we can accept PDF, ISGS, DWG, STEP file format. If you don't have the drawings, please send us the samples, we can also quote you according to your samples.
Q: What is your minimum order size?
A: it is usually 100 pieces, but a low quantity is acceptable under some special circumstances.
Q: Do you provide samples? Is it free or extra?
A: Yes, we can provide samples free of charge, but we don't pay the freight.
Q: What is the lead time for mass production?
A: honestly, it depends on the number of orders. Normally, if you don't need the tools, deposit them after 30 days or so.
Q: What if the parts don't Work?
A: we can guarantee the quality, but if it happens, please contact us immediately, take some photos, we will check the problem and solve it as soon as possible.
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A: payment is less than US $1000,100% in advance. Payment: $1000,50% wire transfer in advance, balance before shipment,Other Terms of payment are negotiable
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