Tag Archives: harmonic reducer

China Benoy MGJ-DRIVE Series precision aluminum harmonic speed gear reducer gearbox bevel vs worm gearbox

Relevant Industries: Resorts, Garment Retailers, Constructing Content Shops, Producing Plant, Equipment Restore Outlets, Foods & Beverage Manufacturing unit, Farms, Restaurant, Home Use, Retail, Food Shop, Printing Retailers, Design works , Energy & Mining, Food & Beverage Outlets, Marketing Firm, Other
Fat (KG): eight
Tailored support: OEM, ODM
Gearing Arrangement: Harmonic
Output Torque: 5173-5570N.m
Input Speed: 2000-8000rpm
Output Velocity: 20-800rpm
Product name: Gear Box
Software: industry
Ratio: 7.5~100
Port: HangZhou, HangZhou, HangZhou

Items Description Benoy precision harmonic reducer staff primarily based on theoretical calculation finite factor investigation, combined with cutting-edge inspection system to acquire a big volume of actual measurement information, the use of multi-aim regression optimization means, effectively split by way of the non-common style troubles of the circular arc tooth shape, the development of breakthrough harmonic reducer.The S-formed optimized involute tooth construction is adopted for smoother and smoother meshing, and the tooth processing of rigid-versatile wheel breaks by way of the traditional sluggish-going for walks and gear hobbing approach. With the unique procedure of hobbing semi-ending 20 Tooth Clutch Drum Equipment Box Sprocket 33cc 43cc 49cc Ty Rod II Go Kart Mini Moto Grime Bicycle Scooter Xtreme steel)BrushingAll metals (e.g aluminum, metal)Anodized HardcoatAluminum and Titanium alloysElectropolishedMetal and plastic (e.g aluminum, Abs)Bead BlastedAluminum and Titanium alloysAnodized Distinct or ShadeAluminum and Titanium alloys Application Field Company Profile HangZhou Benoy Intelligent Technology CO., LTD.was Proven in 2003. Because recognized, we constantly emphasis on precision mechanical areas production&processing. We have expert R&D staff and superior CNC equipment,which can give complete solutions according to user’s demands, from the style.Our very own element producing devices can complete the complete method, this sort of as turning, milling, hobbing, moulding, polishing, portray, and so on, without assistance by the third part.The dimensional tolerance can narrow to +/- .005mm. We have do well to support numerous customers to deal with the precision mechanical components with substantial degree demandWe can manufacture all field of gear&machine components and accessories. If there is any necessary, just deliver us your needs. If you need any precision elements cnc machining service, remember to just ship us your drawing and requirement, we will give you the greatest resolution.Welcome your inquiry. Packing&Cargo FAQ Q1: How to get a quotation?A1: Remember to send us drawings in igs, dwg, action etc. together with thorough PDF.If you have any demands, make sure you be aware, and we could provide specialist guidance for your reference.Q2: How prolonged can i get the sample?A2: Depends on your distinct products,inside of 7-ten times is required usually.Q3: How to get pleasure from the OEM companies?A3: Usually, base on your design and style drawings or authentic samples, we give some specialized proposals and a quotation to you, soon after your arrangement, we produce for you.This autumn: Will my drawings be protected right after sending to you?A4: Sure, we will maintain them effectively and not release to 3rd party with out your permission. Of training course, we would make certain the protection of the drawing.Q5: What shall we do if we do not have drawings?A5: Please deliver your sample to our manufacturing unit,then we can duplicate or give you better answers. Please ship us images or drafts with proportions(Duration,Hight,Width), CAD or 3D file will be created for you if positioned order.

What is a worm gear reducer gearbox?

A worm gear reducer gearbox is a mechanical device that uses a worm gear and a worm to reduce the speed of a rotating shaft. The gear reducer gearbox can increase the output torque of the engine according to the gear ratio. This type of gear reducer gearbox is characterized by its flexibility and compact size. It also increases the strength and efficiency of the drive.
worm reducer

Hollow shaft worm gear reducer gearbox

The hollow shaft worm gear reducer gearbox is an additional output shaft connecting various motors and other gearboxes. They can be installed horizontally or vertically. Depending on size and scale, they can be used with gearboxes from 4GN to 5GX.
Worm gear reducer gearboxes are usually used in combination with helical gear reducer gearboxes. The latter is mounted on the input side of the worm gear reducer gearbox and is a great way to reduce the speed of high output motors. The gear reducer gearbox has high efficiency, low speed operation, low noise, low vibration and low energy consumption.
Worm gear reducer gearboxes are made of hard steel or non-ferrous metals, increasing their efficiency. However, gears are not indestructible, and failure to keep running can cause the gear oil to rust or emulsify. This is due to moisture condensation that occurs during the operation and shutdown of the reducer gearbox. The assembly process and quality of the bearing are important factors to prevent condensation.
Hollow shaft worm gear reducer gearboxes can be used in a variety of applications. They are commonly used in machine tools, variable speed drives and automotive applications. However, they are not suitable for continuous operation. If you plan to use a hollow shaft worm gear reducer gearbox, be sure to choose the correct one according to your requirements.

Double throat worm gear

Worm gear reducer gearboxes use a worm gear as the input gear. An electric motor or sprocket drives the worm, which is supported by anti-friction roller bearings. Worm gears are prone to wear due to the high friction in the gear teeth. This leads to corrosion of the confinement surfaces of the gears.
The pitch diameter and working depth of the worm gear are important. The pitch circle diameter is the diameter of the imaginary circle in which the worm and the gear mesh. Working depth is the maximum amount of worm thread that extends into the backlash. Throat diameter is the diameter of the circle at the lowest point of the worm gear face.
When the friction angle between the worm and the gear exceeds the lead angle of the worm, the worm gear is self-locking. This feature is useful for lifting equipment, but may be detrimental to systems that require reverse sensitivity. In these systems, the self-locking ability of the gears is a key limitation.
The double throat worm gear provides the tightest connection between the worm and the gear. The worm gear must be installed correctly to ensure maximum efficiency. One way to install the worm gear assembly is through a keyway. The keyway prevents the shaft from rotating, which is critical for transmitting torque. Then attach the gear to the hub using the set screw.
The axial and circumferential pitch of the worm gear should match the pitch diameter of the larger gear. Single-throat worm gears are single-threaded, and double-throat worm gears are double-throat. A single thread design advances one tooth, while a double thread design advances two teeth. The number of threads should match the number of mating gears.
worm reducer

Self-locking function

One of the most prominent features of a worm reducer gearbox is its self-locking function, which prevents the input and output shafts from being interchanged. The self-locking function is ideal for industrial applications where large gear reduction ratios are required without enlarging the gear box.
The self-locking function of a worm reducer gearbox can be achieved by choosing the right type of worm gear. However, it should be noted that this feature is not available in all types of worm gear reducer gearboxes. Worm gears are self-locking only when a specific speed ratio is reached. When the speed ratio is too small, the self-locking function will not work effectively.
Self-locking status of a worm reducer gearbox is determined by the lead, pressure, and coefficient of friction. In the early twentieth century, cars had a tendency to pull the steering toward the side with a flat tire. A worm drive reduced this tendency by reducing frictional forces and transmitting steering force to the wheel, which aids in steering and reduces wear and tear.
A self-locking worm reducer gearbox is a simple-machine with low mechanical efficiency. It is self-locking when the work at one end is greater than the work at the other. If the mechanical efficiency of a worm reducer gearbox is less than 50%, the friction will result in losses. In addition, the self-locking function is not applicable when the drive is reversed. This characteristic makes self-locking worm gears ideal for hoisting and lowering applications.
Another feature of a worm reducer gearbox is its ability to reduce axially. Worm gears can be double-lead or single-lead, and it is possible to adjust their backlash to compensate for tooth wear.

Heat generated by worm gears

Worm gears generate considerable amounts of heat. It is essential to reduce this heat to improve the performance of the gears. This heat can be mitigated by designing the worms with smoother surfaces. In general, the speed at which worm gears mesh should be in the range of 20 to 24 rms.
There are many approaches for calculating worm gear efficiency. However, no other approach uses an automatic approach to building the thermal network. The other methods either abstractly investigate the gearbox as an isothermal system or build the TNM statically. This paper describes a new method for automatically calculating heat balance and efficiency for worm gears.
Heat generated by worm gears is a significant source of power loss. Worm gears are typically characterized by high sliding speeds in their tooth contacts, which causes high frictional heat and increased thermal stresses. As a result, accurate calculations are necessary to ensure optimal operation. In order to determine the efficiency of a gearbox system, manufacturers often use the simulation program WTplus to calculate heat loss and efficiency. The heat balance calculation is achieved by adding the no-load and load-dependent power losses of the gearbox.
Worm gears require a special type of lubricant. A synthetic oil that is non-magnetic and has a low friction coefficient is used. However, the oil is only one of the options for lubricating worm gears. In order to extend the life of worm gears, you should also consider adding a natural additive to the lubricant.
Worm gears can have a very high reduction ratio. They can achieve massive reductions with little effort, compared to conventional gearsets which require multiple reductions. Worm gears also have fewer moving parts and places for failure than conventional gears. One disadvantage of worm gears is that they are not reversible, which limits their efficiency.
worm reducer

Size of worm gear reducer gearbox

Worm gear reducer gearboxes can be used to decrease the speed of a rotating shaft. They are usually designed with two shafts at right angles. The worm wheel acts as both the pinion and rack. The central cross section forms the boundary between the advancing and receding sides of the worm gear.
The output gear of a worm gear reducer gearbox has a small diameter compared to the input gear. This allows for low-speed operation while producing a high-torque output. This makes worm gear reducer gearboxes great for space-saving applications. They also have low initial costs.
Worm gear reducer gearboxes are one of the most popular types of speed reducer gearboxes. They can be small and powerful and are often used in power transmission systems. These units can be used in elevators, conveyor belts, security gates, and medical equipment. Worm gearing is often found in small and large sized machines.
Worm gears can also be adjusted. A dual-lead worm gear has a different lead on the left and right tooth surfaces. This allows for axial movement of the worm and can also be adjusted to reduce backlash. A backlash adjustment may be necessary as the worm wears down. In some cases, this backlash can be adjusted by adjusting the center distance between the worm gear.
The size of worm gear reducer gearbox depends on its function. For example, if the worm gear is used to reduce the speed of an automobile, it should be a model that can be installed in a small car.

China Benoy MGJ-DRIVE Series precision aluminum harmonic speed gear reducer gearbox     bevel vs worm gearboxChina Benoy MGJ-DRIVE Series precision aluminum harmonic speed gear reducer gearbox     bevel vs worm gearbox
editor by czh 2023-02-09

China Custom Integrated harmonic reducer for robot arm near me manufacturer

Applicable Industries: Manufacturing Plant, Machinery Repair Shops, Food & Beverage Factory, Food Shop, Printing Shops, Construction works , Energy & Mining, Food & Beverage Shops, Advertising Company, Robotic
Gearing Arrangement: Harmonic
Output Torque: 3.8-140
Input Speed: 3000
Output Speed: Laifual harmonic drive
Product name: LFS series harmonic gear drive for scara robot
Load Capacity: 3.8-7.8Nm
Ratio: 50-160
Material: Iron, Stainless steel
Warranty: 1 Year
Application: Robotic, Automation equipment, CNC machine
Logo: Laifual
Packaging Details: Carton box
Port: HangZhou

Laifual’s harmonic drive are widely used on robots, automation equipment(CNC equipment, rotation equipment), Manufacturer OEM Iron nickel plated carbon steel pin flex putter front drive shaft medical equipment and etc. Main featuresLFS Series harmonic speed gearbox that can be integrated with motorA combination product that with light weight, ultra-flat. Using cross-roller bearing.LFS Integrated series gear reducerCombined harmonic drive with the high-performance small motor, with the highest input characteristics under the same gearconditions. Detailed Images Specification Application Industrial robot Service robot Rehabilitation robot Automation equipment Medical equipment Machine tool industry After Sales Service We know how important fast response and uptime are to you. Laifual serves as your back-up resource when response time is critical.Count on the Laifual product service team to provide assistance when you need it most. We provide support for our customers 24hours a day, 7 days a week. Company Introduction ZHangZhoug Laifual Drive Co., Ltd is a national high-tech enterprise, mainly engaged in research and manufacture of high-precision harmonic reducers and planetary gear reducers. Total factory is 30,000 square meters. About 300 employees, including around 30 R&D Personnel, with more than 10 years experience in research and development.Laifual uses the world’s first class production and inspection equipment. Pay attention to every production details, we have very strict quality control from raw materials to the finished products, to make sure the excellent quality of all products. Allproducts are completely developed by ourselves, Laifual’s R&D center is recognized as ” Customized AC Synchronous 48V607296108V 3KW5KW7KW10KW15KW AC Motor for Electric Vehicle Car Golf Cart High-tech enterprise R&D center in ZHangZhoug province”.After years of hard working, Laifual has obtained 30 patents in the field of drive area. Including 1 major scientific andtechnological patent and 29 independent intellectual property rights patents. Laifual was recognized as a national high-techenterprise, medium-sized enterprise in ZHangZhoug province, and successfully passed the ISO9001 quality management system certification. Why choose Laifual drive? 1. With GB/T 19001-2008 / ISO9001:2008 certificate factory.2. One of the biggest harmonic gearbox manufacture in China.3. Factory scale: 30,000 square meter. Total investment: 30 million USD.4. Production Capacity: 200,000 Units/Year.5. Willing to offer customized services to all our valued customers.6. Professional technical department to offer any support to customers. FAQ Q: Do you produce the harmonic drives by yourself?Yes, we are professional harmonic gearbox manufacture in China. Our factory located in ZHangZhoug province. Warmly welcome all customers come to visit us.Q: What’s the general delivery time?The delivery time for Laifual Harmonic Drive as standard drawing is 10-15 working days.If you need to modify the drawing,we will recheck the new delivery time for you.Q: Can you offer OEM&ODM services?Yes, we can offer OEM and ODM services according to customers’ requirement.Q: Do you have professional technology team?Yes,we have more than 30 employees technical team. We can offer professional technical solution for customers project.Q: What’s the biggest advantage of your products?Yes, Front Rear Gear Box Motor Reducer Reduction Gearbox our product can be fully replace overseas brand. And we are confident to say we are the most cost-effective brand in China.

Types of Vehicle Gearboxes

In a vehicle, there are many types of gearboxes available. There are planetary gearboxes, Coaxial helical gearboxes, and skew bevel helical gearboxes, among others. In this article, we’ll cover all of them and help you determine which type of gearbox would be right for your vehicle. Also, we’ll discuss how each differs from the others.
gearbox

planetary gearbox

A planetary gearbox is composed of three main components: a sun gear, an input bevel gear, and an output shaft. A planetary gearbox can have different output torques and ratios. The basic model of a planetary gearbox is highly efficient and transmits 97% of the power input. There are several kinds of planetary gearboxes, depending on the type of operation. In general, there are three types: the simple, the intermediate, and the complex.
The price of a planetary gearbox can vary a lot, and it’s important to know what you’ll need. Different manufacturers produce different planetary gearboxes, so check with a manufacturer to see what they have available. Make sure to check the quality of the planetary gearbox before making a final purchase. In addition, be sure to compare the prices and the availability of a particular product. A quality planetary gearbox will provide years of trouble-free operation and will not break your bank.
Planetary gears feature an integer number of teeth. Each planet has teeth that must mesh with its ring or sun. The number of planets, ring, and tooth count of each gear determine whether the teeth mesh. Some planets have fewer teeth than others, so they mesh better than others. However, compound planets can be more flexible and achieve higher reduction ratios. If you’re looking for a planetary gearbox for your next project, consider getting in touch with a manufacturer who specializes in this technology.
When it comes to construction, a planetary gearbox is no exception. It’s extremely important to choose the right planetary gear for your application, because an imbalance in the planet gear can cause increased wear and failure. Moreover, the compact size of a planetary gear ensures maximum heat dissipation. However, a planetary gear box may require cooling in some applications. A planetary gearbox will make your life easier, and it will give you years of trouble-free operation.

Straight bevel helical gearbox

The Straight bevel helical gearbox has a number of advantages, but it has a relatively short manufacturing process. Its most popular application is in the automotive industry, where it is used in many types of vehicles. Other applications include heavy and light equipment and the aviation and marine industries. Below is a brief introduction to this gearbox type. Read on to learn about its benefits. This type of gearbox is one of the easiest to manufacture.
The spiral bevel gear has larger teeth than straight bevel gears, resulting in a smoother, quieter rotation. It can handle high-speed heavy loads with less vibration. Spiral bevel gears are classified by their tooth form and cutting method. Straight bevel gears are easier to design and manufacture, but spiral bevel gears are more expensive. Both designs are suitable for high-speed, heavy-load operations, and general manufacturing applications.
In addition to being easy to install, the modular bevel gears have many advantages. They have an exceptionally high degree of interchangeability and feature the highest standards of component integrity. They can also be tailored to meet your specific requirements. The advantages of this gearbox type include high precision, optimum performance, and low noise. And because they are modular, they can be produced in a variety of finishes. These include stainless steel, titanium, and bronze.
Straight bevel helical gearbox manufacturers are committed to a high degree of precision in their designs. The radii, torques, and tooth profiles of straight bevel gears are more precisely measured than those of cylindrical bevel gears. The same calculations are used for all traditional bevel gear generators. This ensures that your 5-axis milled bevel gear sets have the same calculations and layout.
gearbox

Coaxial helical gearbox

The Coaxial helical gearbox is a highly efficient transmission system that is well suited for light-duty applications. Compared to spur-type gearboxes, the real pitch of a Coaxial helical gearbox is low at all helix angles. This is because the coaxial type has the same number of teeth and center gap as the spur gearbox. Coaxial helical gearboxes also have a smaller footprint and are compact.
Several nations have implemented lockdown regulations for Industrial Gearbox trade, threatening the global economy. Several factors have been implicated in COVID-19, including supply chain, market, and financial markets. Experts are monitoring the situation globally and project remunerative prospects for gearbox manufacturers after the crisis. This report depicts the latest scenario and offers a comprehensive analysis of COVID-19’s impact on the entire industry.
This Coaxial helical gearbox features a compact structure and high precision gear. Its three-stage design combines two-stage gears with a single-stage gear, forging high-quality alloy steel for high precision and durability. The gears are serially-designed for easy interchangeability. They are also available in high-frequency heat-treated steel. A Coaxial helical gearbox is the perfect solution for many applications.
Coaxial helical gearboxes have the added benefit of using cylindrical gears instead of shafts. They operate quietly, and have more surface area to interact with. Their fixed angles make them suitable for heavy-duty applications, like in conveyors, coolers, and grinders. Compared to other gearbox types, Helical gearboxes have higher power-carrying capacity. Listed below are the benefits of a Coaxial Helical Gearbox

Skew bevel helical gearbox

A Skew bevel helical gear box is a common type of industrial gearbox. These gearboxes are rigid and compact and can be used in a variety of applications. They are commonly used in heavy-duty applications such as grinding mills, conveyors, and coolers. They are used in many applications to provide rotary motions between non-parallel shafts. They also have the added benefit of high-efficiency in a variety of industries.
Skew bevel helical gear boxes are suitable for heavy loads and are monolithic in construction. This type of gearbox combines the benefits of bevel and helical gears for right-angle torque, which makes it a popular choice for heavy-duty applications. In addition to being a robust and reliable gearbox, these gearboxes are highly customizable and can meet almost any industrial need.
To maximize the efficiency of bevel gears, FE-based tooth contact analysis is used to develop a sophisticated geometry optimization algorithm. The software also allows users to define optimal flank topography by introducing application-specific weightings for specific load levels. With this data, a manufacturing simulation is conducted to determine the best variant. A robust variant combines the benefits of efficiency, load-carrying capacity, and low excitation behavior.
The helical gear can be angled at 90 degrees. This is similar to a spur gear but produces less noise. It can achieve a nine-to-one speed reduction with one stage. However, a helical gear requires a larger driver gear for higher reductions. This gearbox is suitable for speeds from 1:1 to three times. They are often used in the manufacture of motors and generators.
gearbox

Extruder helical gearbox

An extruder helical gearbox is one of the most common industrial gears. It is compact in size and low-power consuming, making it ideal for heavy-duty applications. Extruder helical gearboxes are suitable for a variety of industrial applications, including cement, plastics, rubber, conveyors, and coolers. In addition to its use in plastics and rubber manufacturing, this gearbox is also useful in other low-power applications such as crushers, coolers, and conveyors.
CZPT SG series Extruder Helical Gearboxes are available in Single Screw and Twin Screw Variations. These gears feature a compact design, high power density, and long service life. Axial bearing housing and thrust bearings are mounted on the input shafts. Extruder helical gearboxes can be installed in various positions, including horizontal, vertical, and inclined.
Helicoidal gears are often produced in a modular manner. This design provides multiple benefits, including engineering and performance advantages, modular production, and the highest level of component integrity. A single helical gearbox can be assembled into a larger gearbox if needed, but modular production ensures consistent performance and economy. This modular design is also cost-effective. It is a versatile and reliable solution for a wide range of applications.
In addition to its efficiencies, Extruder helical gearboxes also have a low noise profile. They have no squeal sounds, and they are silent when running. They can transfer more power than conventional gearboxes. This type of gear has been used in the manufacturing of high-quality plastic products for years. They are often used for applications in automotive transmissions. Aside from being quiet, helical gears have higher contact levels and lower vibration.

China Custom Integrated harmonic reducer for robot arm  near me manufacturer China Custom Integrated harmonic reducer for robot arm  near me manufacturer

in Abuja Nigeria sales price shop near me near me shop factory supplier Sanlian Hot Sale Nmrv Series Worm Gearbox Helical Bevel Reduction Gearbox Harmonic Drive Reducer Gearbox for Toy Vehicle manufacturer best Cost Custom Cheap wholesaler

  in Abuja Nigeria  sales   price   shop   near me   near me shop   factory   supplier Sanlian Hot Sale Nmrv Series Worm Gearbox Helical Bevel Reduction Gearbox Harmonic Drive Reducer Gearbox for Toy Vehicle manufacturer   best   Cost   Custom   Cheap   wholesaler

Our professionals and engineers have 23 years of Expertise in the Bearing Business. We can provide a entire-variety of energy transmission products like chains, sprockets and plate wheels, pulleys, gearboxes, motors, couplings, gears and racks. PersonnelOur income persons are properly trained to accommodate your requests and talk English for your usefulness. Products Traits
one. Mad of high-good quality EPT alloy,ligEPT weigEPT and non-rusting
two. Large output torque
three. Clean in running and reduced in sounds,can work EPT time in dreadful situations.
four. Substantial in radiating effectiveness.
5. Good-searching in appearance,resilient in provider lifestyle and little in volume.
6. Suitable for omnibearing installation.

type: Worm Gear Speed EPT/ EPT
Product No.: NMRV571, NMRV030, NMRV040, NMRV050, NMRV063, NMRV075, NMRV090, NMRV110, NMRV130, NMRV150
Ratio: 5,7.five,10,15,20,twenty five,thirty,forty,50,sixty,80,a hundred
Colour: Blue(Ral5571)/Silver Grey (RAL9006) Or On Buyer Ask for
EPT: EPT: Dimension twenty five-a hundred and ten Is EPT Alloy, Size 110-a hundred and fifty Is Cast-Iron
Worm Wheel: ZCuSn10Pb1
Worm:20Cr
Pinion:Tin Bronze
Output Shaft: Steel-forty five#
Usages: EPT EPT: Meals Stuff, Ceramics, Chemical, EPT, Dyeing,EPT operating, Glass.
IEC Flange: IEC StXiHu (West Lake) Dis.Hu (West Lake) Dis.rd Flange Or On Buyer Ask for

: Are you investing organization or manufacturer ?

A: We are factory.

Q: How EPT is your shipping time?

A: EPTly it is 5-ten daEPTif the products are in inventory. or it is 15-20 daEPTif the products are not in inventory, it is in accordance to amount.

Q: Do you give samples ? is it cost-free or added ?

A: Indeed, we could provide the sample for free of charge charge but do not pay the EPT of freight.

Q: What is your phrases of payment ?

A: Payment lt=1000USD, 100% EPT. Payment gt=1000USD, 30% T/T EPT ,balance ahead of shippment.
If you have yet another concern, pls feel free to make contact with us as below:

  in Abuja Nigeria  sales   price   shop   near me   near me shop   factory   supplier Sanlian Hot Sale Nmrv Series Worm Gearbox Helical Bevel Reduction Gearbox Harmonic Drive Reducer Gearbox for Toy Vehicle manufacturer   best   Cost   Custom   Cheap   wholesaler

  in Abuja Nigeria  sales   price   shop   near me   near me shop   factory   supplier Sanlian Hot Sale Nmrv Series Worm Gearbox Helical Bevel Reduction Gearbox Harmonic Drive Reducer Gearbox for Toy Vehicle manufacturer   best   Cost   Custom   Cheap   wholesaler