RV Series Worm Gear Speed Reducer

The RV reducer consists of a front stage of a planet-gear speed reducer and a rear stage of a cycloidal pin gear speed reducer. The RV reducer has the advantages of compact structure, large transmission ratio, and transmission mechanism with a self-locking function under certain conditions. It is 1 of the most commonly used reducers, and it has low vibration, low noise and low energy consumption.

RV Reducer Features:
(1) A large transmission ratio range;
(2) The torsional stiffness is large, and the output mechanism is the planet carrier supported at both ends. The rigid disc with the left end of the planet carrier is output. The large disc is bolted with the working mechanism, and its torsional stiffness is much larger than that of the general cycloidal pinwheel. The output mechanism of the reducer. Under the rated torque, the elastic backlash is small;
(3) As long as the design is reasonable and the manufacturing assembly precision is guaranteed, high precision and small gap backlash can be obtained;
(4) High transmission efficiency;
(5) The volume when transmitting the same torque and power is small (or the bearing capacity per unit volume is large), the RV reducer uses 3 planetary gears for the first stage, especially the second stage, the cycloidal pin wheel is hard. The multi-tooth engagement of the tooth surface, which in turn determines that it can transmit large torque with a small volume, and in the structural design, the transmission mechanism is placed in the supporting main bearing of the planet carrier, so that the axial dimension is greatly reduced. All of the above factors greatly reduce the total volume of the transmission.

RV Series Worm Gear Speed Reducer Specification:

Type:
Worm Gear Speed Reducer

Model:
a) NMRV571-130(F)
b) NRV571-130(F)
c) NMRV-NMRV571-130(F)
d) NRV-NMRV571-130(F)

Ratio:
1:5,7.5,10, Newest High Power Electric Tricycle Effficient Cargo Bike Three Wheel Motorcycle made in China for Sell 15,20,25,30,40,50,60,80,100

Colour:
Blue/Silver Or On Customer Request

Material:
Housing: Die-Cast Aluminum Alloy

Packing:
Carton and Wooden Case

Bearing:
C&U Bearing

Seal:
NAK SKF

Input power:
0.06KW,0.09KW,0.12KW,0.18KW,0.22KW,0.25KW,0.37KW,0.55KW,0.75KW,1.1KW,
1.5KW, 2.2KW,3KW, Automotive Spare Parts 1 To 1 Exchange Car Wheel Center Hub Car Parts CV Joints Power Transfer 27X64X30 Q7 30-64-27 4KW,4.8KW ,5.5KW,7.5KW,9.2KW

Usages:
Industrial Machine, Food Stuff, Ceramics, CHEMICAL, Packing, Dyeing, Woodworking, Glass.

Lubricant:
Synthetic/Mineral

Worm Gear Speed Reducer summary:

Single Step Worm Gear Reducer
1. Made of Aluminum alloy die-casting box, good looking in appearance, compact in structure rust proofing on Surface and small volume to save mounting space.
2. Good radiating characteristic leads safe and high efficiency for using.
3. The strong capacity of loading and overload ensure stable transmission, make less vibration and noise.
4. Varies of connecting structure for power input and torque output meet different requirements; the design of box outline and the set of foot hole is apt to with high many kinds of mounting.
5. Besides big cases, no gap structure of box means a maintenance-free that is hermetically sealed. It prevents the lubricant from easily losing and going bad, and exchanging.
Double Step Worm Gear Reducer
1. It is combined by 2 single step reducers and has all the virtues of them. And you can get bigger ratio with it.
2. The models of25/30,25/40,30/40,30/50,30163, GJF Manufacturer wholesale left side drive shaft for Hyundai Tucson 2.0 2WD 4WD 05-15 C-HY001A-8H 49501-2E400 40/75,40/90,50/110,63/130,63/150, are in common use.
3. You can choose25,30,40,50,63,75,90,110,130,150 as combination units to combine according to the fact of your special needs.

Worm Gear Speed Reducer Structure View:

Worm Gear Speed Reducer Model & Marker:

Dimensions:

NMRV571 Speed Reducer:

NRV speed reducer

NRV-NMRV Speed Reducer:
NMRV-NMRV Speed Reducer:

NMRV-NMRV Mounting Positions:

Manufacture Picture:

Main Equipment

Company Information

FAQProcess Of An Order:
1.Please check product detailed information above.
A. Model/Size B. Transmission Ratio C. Shaft Direction D. Order Quantity.
2.Our Export Service Team will contact you with a quotation file 3 hours after our team get your enquiry.
3.When you please an order, our team will confirm with you about color, package, method of payment and delivery,
then a sales contract will be sent to you to confirm.
4.Packing: Carton and Wooden Case.
Any question, please don’t hesitate to contact us. Thank you!

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.