Custom made small worm gear
Common materials that apply:
S45C or SAE AISI 1045 , SCM440 or 42CrMo4 or SAE AISI 4140, SCM415 or 15CrMo5 or SAE AISI 4115
SNCM220 or 21NiCrMo2 or SAE AISI 8620 , SNCM439 or 40NiCrMo6 or SAE AISI 4340, aluminum alloy AL6061 T6 AL7075 T6
copper, brass, bronze, phosphor bronze
SUS 303 or UNS S30300 or AISI 303 or DIN X10CrNiS18 9 or EN X8CrNiS18-9 , SUS 304 or UNS S30400 or AISI 304
POM ( Polyoxymethylene ), NYLON 66
In some cases, cast iron, forging, powder metallurgy apply.
Process that may apply:
Hobbing, shaping,milling, lathing, drilling, tapping, keyseating, machining, broaching, rolling, grinding, skiving.
electroplating, anodizing, dyeing, laser engraving, Nitrification, high-freequency induction and carburetion treatment, quenching, tempering, annealing.
The gears we make:
spur gears, double spur gears, brass spur gear, large spur gears, small spur gears, aluminum spur gears, miniature spur gears, mini spur gears,
helical gears, double helical gears, involute gears
worm and worm wheel, worm shafts, worm gear screw shafts, worm gear unit, micro worm gears, mini worm gears, worm drive shafts, worm gear shafts
pinion gears, small gears, small pinion gears, pinion spur gears, MLX Series Bevel & Planetary Gear Vertical Mounting Vertical Mill Gearboxes for Cement Coal Mills wheel pinions, precision gears, brass pinion gears, fishing reel pinion gears, toy motor pinion gears,
planet gears, sun gears,epicyclic gears, annular gears, annulus ring gears, planetary pinion gears.
inner gears, internal ring gears, inner ring gears, ring and pinion gears
external ring gears, outer ring gears, flywheel ring gears
bicycle sprockets, chain sprockets, roller chain sprockets, conveyor sprockets, chain wheel sprockets, sprocket wheels, kart sprockets, motor sprockets
plastic spur gears, plastic double spur gears, plastic helical gears, plastic worm gears, plastic pinion gears, plastic sprockets, Nylon gears
large gears, brass gears, copper gears, bronze gears, alloy metal gears
shafts, stainless steel shafts, metal shafts, brass shafts, gear shafts, motor shafts, transmission shafts, input shafts, output shafts, spur gear shafts, helical gear shafts, splines, spline shafts, gear shaft set, spline gears, spline gear shafts, pinion shafts, precision shafts, hydraulic shafts, machine shafts, HXHV sintered bearing Sintered oilite bushingbronze bushing bearing SAE841 roller shafts
The features of our gear:
1. Low vibration
2. Low noise
3. Sustain high speed operation.
A wide range of application with our gears and shafts:all sorts of motorsreducer motors, electrical motors, stepper motors, DC motors, AC motors, servo motors, geared motors, water pump motors, brushless motors, 12V motors, tubular motors, starter motors, induction motors, hydraulic motors, hub motors, wiper motors, bicycle motors, actuators, linear motors
all sorts of machines
CNC machines, wrapping machine, strapping machines, packing machines, printing machines, papper shredders, wood cutting machines, food processing machines, sewing machines
tools and mechanical parts
pneumatic hand tools, power transmission gears, lawnmowers, brush cutters, gearbox, gear box, planetary gearbox
health care and fitness
automatic hospital beds, wheelchairs, treadmills, massage chairs, bicycles
home appliance and recreation
safe box, sliding gate, rolling door, roller shutter, power transmission parts, fishing gears, rc cars, rc helicopters, rc toys, robotic toys.
sunroof motors, power window motors, automotive parts, motorcycle parts, ATV parts
With over 25 years dedication to the manufacture of gears and shafts, our ultimate goal is to deliver the best service at an irresistible cost. That is why we invest in many state of the art produce and inspection equipment.
We only work on custom made cases.
we are a OEM gear manufacturer. Offering CZPT made or bespoke gears and shafts is our major service. The best way to use our service is to provide the engineering drawings of your projects and wait for our best quote.
Company InformationA glimpse into our facility :
1. LCS 200 Gear generating and profile grinding machine made by LIEBHERR, Germany
2. KP200 auto CNC skiving machine made by KOEPFER, 125Cc 4X4 Manufacturers Sell Atv Four Wheeled Beach Buggy Made In China Cheap Allterrain Vehicle Germany
3. KN151 auto CNC skiving machine made by KASHIFUJI , Japan
4. TTi-300H CNC gear measuring system made by Tokyo Technical instruments Inc. Japan
An Overview of Worm Shafts and Gears
This article provides an overview of worm shafts and gears, including the type of toothing and deflection they experience. Other topics covered include the use of aluminum versus bronze worm shafts, calculating worm shaft deflection and lubrication. A thorough understanding of these issues will help you to design better gearboxes and other worm gear mechanisms. For further information, please visit the related websites. We also hope that you will find this article informative.
Double throat worm gears
The pitch diameter of a worm and the pitch of its worm wheel must be equal. The two types of worm gears have the same pitch diameter, but the difference lies in their axial and circular pitches. The pitch diameter is the distance between the worm’s teeth along its axis and the pitch diameter of the larger gear. Worms are made with left-handed or right-handed threads. The lead of the worm is the distance a point on the thread travels during one revolution of the worm gear. The backlash measurement should be made in a few different places on the gear wheel, as a large amount of backlash implies tooth spacing.
A double-throat worm gear is designed for high-load applications. It provides the tightest connection between worm and gear. It is crucial to mount a worm gear assembly correctly. The keyway design requires several points of contact, which block shaft rotation and help transfer torque to the gear. After determining the location of the keyway, a hole is drilled into the hub, which is then screwed into the gear.
The dual-threaded design of worm gears allows them to withstand heavy loads without slipping or tearing out of the worm. A double-throat worm gear provides the tightest connection between worm and gear, and is therefore ideal for hoisting applications. The self-locking nature of the worm gear is another advantage. If the worm gears are designed well, they are excellent for reducing speeds, as they are self-locking.
When choosing a worm, the number of threads that a worm has is critical. Thread starts determine the reduction ratio of a pair, so the higher the threads, the greater the ratio. The same is true for the worm helix angles, which can be one, two, or three threads long. This varies between a single thread and a double-throat worm gear, and it is crucial to consider the helix angle when selecting a worm.
Double-throat worm gears differ in their profile from the actual gear. Double-throat worm gears are especially useful in applications where noise is an issue. In addition to their low noise, worm gears can absorb shock loads. A double-throat worm gear is also a popular choice for many different types of applications. These gears are also commonly used for hoisting equipment. Its tooth profile is different from that of the actual gear.
Bronze or aluminum worm shafts
When selecting a worm, a few things should be kept in mind. The material of the shaft should be either bronze or aluminum. The worm itself is the primary component, but there are also addendum gears that are available. The total number of teeth on both the worm and the addendum gear should be greater than forty. The axial pitch of the worm needs to match the circular pitch of the larger gear.
The most common material used for worm gears is bronze because of its desirable mechanical properties. Bronze is a broad term referring to various copper alloys, including copper-nickel and copper-aluminum. Bronze is most commonly created by alloying copper with tin and aluminum. In some cases, this combination creates brass, which is a similar metal to bronze. The latter is less expensive and suitable for light loads.
There are many benefits to bronze worm gears. They are strong and durable, and they offer excellent wear-resistance. In contrast to steel worms, bronze worm gears are quieter than their counterparts. They also require no lubrication and are corrosion-resistant. Bronze worms are popular with small, light-weight machines, as they are easy to maintain. You can read more about worm gears in CZPT’s CZPT.
Although bronze or aluminum worm shafts are the most common, both materials are equally suitable for a variety of applications. A bronze shaft is often called bronze but may actually be brass. Historically, worm gears were made of SAE 65 gear bronze. However, newer materials have been introduced. SAE 65 gear bronze (UNS C90700) remains the preferred material. For high-volume applications, the material savings can be considerable.
Both types of worms are essentially the same in size and shape, but the lead on the left and right tooth surfaces can vary. This allows for precise adjustment of the backlash on a worm without changing the center distance between the worm gear. The different sizes of worms also make them easier to manufacture and maintain. But if you want an especially small worm for an industrial application, you should consider bronze or aluminum.
Calculation of worm shaft deflection
The centre-line distance of a worm gear and the number of worm teeth play a crucial role in the deflection of the rotor. These parameters should be entered into the tool in the same units as the main calculation. The selected variant is then transferred to the main calculation. The deflection of the worm gear can be calculated from the angle at which the worm teeth shrink. The following calculation is helpful for designing a worm gear.
Worm gears are widely used in industrial applications due to their high transmittable torques and large gear ratios. Their hard/soft material combination makes them ideally suited for a wide range of applications. The worm shaft is typically made of case-hardened steel, and the worm wheel is fabricated from a copper-tin-bronze alloy. In most cases, the wheel is the area of contact with the gear. Worm gears also have a low deflection, as high shaft deflection can affect the transmission accuracy and increase wear.
Another method for determining worm shaft deflection is to use the tooth-dependent bending stiffness of a worm gear’s toothing. By calculating the stiffness of the individual sections of a worm shaft, the stiffness of the entire worm can be determined. The approximate tooth area is shown in figure 5.
Another way to calculate worm shaft deflection is by using the FEM method. The simulation tool uses an analytical model of the worm gear shaft to determine the deflection of the worm. It is based on a two-dimensional model, which is more suitable for simulation. Then, you need to input the worm gear’s pitch angle and the toothing to calculate the maximum deflection.
Lubrication of worm shafts
In order to protect the gears, worm drives require lubricants that offer excellent anti-wear protection, high oxidation resistance, and low friction. While mineral oil lubricants are widely used, synthetic base oils have better performance characteristics and lower operating temperatures. The Arrhenius Rate Rule states that chemical reactions double every ten degrees C. Synthetic lubricants are the best choice for these applications.
Synthetics and compounded mineral oils are the most popular lubricants for worm gears. These oils are formulated with mineral basestock and four to six percent synthetic fatty acid. Surface-active additives give compounded gear oils outstanding lubricity and prevent sliding wear. These oils are suited for high-speed applications, including worm gears. However, synthetic oil has the disadvantage of being incompatible with polycarbonate and some paints.
Synthetic lubricants are expensive, but they can increase worm gear efficiency and operating life. Synthetic lubricants typically fall into two categories: PAO synthetic oils and EP synthetic oils. The latter has a higher viscosity index and can be used at a range of temperatures. Synthetic lubricants often contain anti-wear additives and EP (anti-wear).
Worm gears are frequently mounted over or under the gearbox. The proper lubrication is essential to ensure the correct mounting and operation. Oftentimes, inadequate lubrication can cause the unit to fail sooner than expected. Because of this, a technician may not make a connection between the lack of lube and the failure of the unit. It is important to follow the manufacturer’s recommendations and use high-quality lubricant for your gearbox.
Worm drives reduce backlash by minimizing the play between gear teeth. Backlash can cause damage if unbalanced forces are introduced. Worm drives are lightweight and durable because they have minimal moving parts. In addition, worm drives are low-noise and vibration. In addition, their sliding motion scrapes away excess lubricant. The constant sliding action generates a high amount of heat, which is why superior lubrication is critical.
Oils with a high film strength and excellent adhesion are ideal for lubrication of worm gears. Some of these oils contain sulfur, which can etch a bronze gear. In order to avoid this, it is imperative to use a lubricant that has high film strength and prevents asperities from welding. The ideal lubricant for worm gears is one that provides excellent film strength and does not contain sulfur.