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The drive or servomotor is connected to the spur gear stage of the gearbox via a pinion. The rotating speed reduces at this point relative to the reduction ratio between the pinion and planetary gear. The planetary gears are connected to crankshafts which drive the cams using needle bearings. These cams rotate inside the case which is lined with pins.
The cam has exactly one eccentric section less than the pin ring has pins. A 360° revolution of the crankshafts therefore causes the cams to rotate one pin farther, whereby practically all the gear teeth are in continuous contact with the pins. The rotating movement is then transmitted from the input shaft to the crankshafts via the spur gear stage, and these then shift the cams in the pin ring and, consequently, generate a reduced speed with high precision. This technology enables the RV gears to absorb 5 times the rated torque in emergency-stop situations without suffering any damage. The resulting overall reduction is the same as the product of the two reduction ratios (spur gear stage and eccentric stage).
Precise
的摆线设计精密减速器ensures extremely precise operation throughout the entire life cycle, with a hysteresis loss of less than one arcminute. The gear systems with zero backlash* are designed for high repeatability, positioning and rotational accuracy to allow exact positioning even at high speeds and accelerations, which makes them ideal for use as servo gearboxes.
*in the cycloidal gear stage
Robust
Nabtesco gears are extremely robust, durable and low-wear. They feature high overload capability and extreme rigidity, and are insensitive to vibrations. This is likewise an advantage for the servo gearboxes of the RH-N and RD series. The integrated angular ball bearings absorb axial and radial loads, as well as bending moments, which makes the gears highly resistant to impacts and overloads.
Compact
The high torque density of the low-backlash precision gears enables an extremely compact design. The precision reducer are lightweight, space-saving, and efficient – ideal for all applications requiring high performance and a compact design. Nabtesco offers a large selection of compact servo gearboxes for highly dynamic applications.
Nabtesco precision gearboxes are completely sealed gear units. They are filled with grease, encapsulated and ready for installation. To reduce the design and assembly costs, we integrate the motor adapter plate and the motor shaft coupling for servo motors in the precision gearboxes. The precision gearboxes are based on our different component sets – with a hollow shaft or solid shaft – and their design features bring numerous advantages.
The solid shaft gearheads of the RH-N series are based on our compact RV-N component sets. They are a perfect plug and play solution and directly ready to use.
That makes these precision gears ideal for use in machine tools, in modern rotary indexers and in different handling applications.
The RH-N series was specially developed for the European market and is manufactured locally. The gearheads achieve outstanding torque performance as well as a high degree of precision in a compact design! Since a drive pinion and motor flange for all current motor types are already integrated in the gearhead, integration in the drive train is fast and easy. An uncomplicated plug & play solution for every machine design engineer!
We deliver the gearheads of the RH-N series pre-filled with lubricant (optionally with H1 grease) and completely enclosed. This makes them ideal for palletising applications in medical technology and foodstuff production! These eccentric gears are also used in milling heads. On request we can adapt them to your individual application!
Applications for RH-N solid shaft gearheads:
Specification:
The gearheads of the RDR-C, RDS-C and RDP-C series have a hollow shaft for routing cables, hoses and lines. An extremely compact and efficient, state- of-the-art RV-C gearbox is concealed in the interior. RD-C gearheads offer three mounting options and have many different areas of use.
While the RDR-C series is designed for right-angle mounting, the RDS-C series is suitable for straight mounting and the RDP-C is the pulley input option. This enables fast, cost-effective installation and diverse application options: The efficient and extremely precise cycloidal gears are ideal for numerous applications, from machine tools to robotics systems and woodworking machinery. We deliver the hollow shaft gearheads of the RD-C series pre-filled with lubricants and completely encapsulated. This means they are immediately ready for use in your system!
Applications for RD-C hollow shaft gearheads
Specification:
The gearheads of the RD_-E series are more compact and versatile than ever. Three different models allow for numerous types of use, e. g. with the choice of the servomotor. A high-precision, extremely resistant and extra durable, latest-generation gearbox is concealed in the interior.
The RDR-E version is designed for right-angle mounting, the RDS-E version for straight mounting. The RDP-E series on the other hand is designed for pulley input. This diversity of versions allows fast and cost-effective installation in a wide range of applications. For example, the precision gears of this series can be used in machine tools, for positioning and palletising, and in solar technology. The gearheads are delivered fully sealed and pre-filled with lubricant. A motor coupling and motor flange for standard servo motors are included.
An alternative to the RD-E series with a hollow shaft for the feed-through of data cables and supply lines is the RD-C-series.
Applications for RD-E solid shaft gearheads:
Specification:
RA-EA and RA-EC gears are specially designed for positioning magazines in machine tools. A motor flange or pinion enables their rapid and simple integration in tool-changing systems for disc and chain magazines (ATC – Automatic Tool Changer).
The precision gears of the RA-EA/EC series offer impressive rigidity and shock-load capability (up to 5 times the rated torque). Their precision, with a hysteresis loss of less than 1 arcmin, is likewise unusually high. Users also benefit from low mass inertia and cost-effective installation in the machine tool or pallet changer system.
Applications for RA-EA/EC solid shaft gearheads:
Specification:
The reduction gears of the GH series are the "easy-to-use" version of the RV series. They impress with drive rates of up to 270 rpm and a shock-load capacity of up to seven times the rated torque. These gears are typically used to automate robots in travel axes, machine tool building and conveyor systems.
Our precision gears of the GH series are designed for easy installation, which makes them ideal for diverse applications. They are commonly used in machine tools, pallet magazines, gantry robots and robot periphery.
Users also benefit from the fact that we deliver these cycloidal gears completely sealed and filled with the proper lubricant
Applications for GH solid shaft gearheads:
Specification:
Nabtesco component sets stand for maximum precision, extremely low vibrations and low inertia. Our ingenious two-stage cycloidal design makes the gears insensitive to shock loads and allows high torques. The force transmission via rollers guaranteed high efficiency ratio of up to 85 percent and a long service life. The component sets of the RV-C and RV-N series also feature integrated angular ball bearings. Hence, there is no need for the customer to provide bearings, as well as the manufacturing costs for the bearing mounts.
We developed the component sets of the RV-N series as very compact, lightweight and high-performance solid shaft gears. These gears are used in applications with limited space that require high torque performance. Perfect for robotics!
RV-N cycloidal gears are very compact due to the main bearing with an integrated inner race. The reinforcement of the crankshaft bearing achieves very high power density. In addition, all gear components are FEM-optimised and are manufactured using state-of-the-art production processes.
An efficiency ratio of up to 85 %, shock resistance of 5 times the rated torque and extreme precision make the eccentric gears of the RV-N series an outstanding choice for diverse robotic applications. Robots benefit from excellent load conditions due to the reduced weight and lower mass inertia. The RV-N series is also used in medical technology, in machine tools and in positioning applications.
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RV-C gears are your ideal choice for very demanding applications. They have a hollow shaft through which power supply cables, drive shafts, etc. can be fed. The RV-C component sets are compact, lightweight and offer high torsional and moment rigidity. Thus, the RV-C gear series reaches exceptional repeatability and path accuracy.
The component sets of the RV-C series have an identical design and the same quality characteristics of the RV-E eccentric gears. The difference is the hollow shaft with a diameter of up to 138 mm.
The design of the RV-C component sets achieves very high repeatability and path accuracy with a hysteresis loss of less than 1 arcmin. In combination with the low vibrations, the RV-C series is therefore ideal for applications in robotics, medical technology, 5-axis machining centres (CNC) and also for antenna systems, which require maximum precision.
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The solid shaft gearboxes of the RF-P series were designed for applications with extremely limited space. That makes them ideal for use in arm axes of Delta and SCARA robots or in wheel drives of Automated Guided Vehicles (AGVs).
The compact cycloidal gears of the RF-P series set new standards for high-speed applications in a compact space. They enable output speeds of up to 200 rpm and operate with extremely high precision (hysteresis loss < 2 arcmin). The cycloidal design with a two-stage gear reduction principle minimises wear – a decisive advantage over conventional planetary gears! The result is low backlash throughout the entire life of up to 20,000 hours of operation. The RF-P series is therefore the first choice for dynamic pick & place, handling and positioning applications!
In machine tool construction the RF-P gears are ideal for use in automatic tool changers (ATCs). The reduction gears offer advantages especially in the version with a chain, in which the output speed can be increased substantially. Tools can be changed much more quickly. In addition, the optional version with housing rotation allows rotation of the chain wheel directly with the gear housing. That saves time and money during installation!
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The basis of our precision gears
The RV series forms the basic version of our component sets and therefore the basis for our entire product spectrum. It stands for high reduction ratios and low backlash. The output bearings can be defined individually.
Since the force is transferred by rollers in the eccentric gears of the RV series, they feature high precision and a low hysteresis loss (< 1 arcmin). An angular contact ball bearing is not integrated in the RV component sets. The external bearing provides for a very compact design and ensures high torsional rigidity. In combination with the individually configurable output bearing, this makes the RV series the ideal solution for integrated applications that exactly match your specifications!
The force is transferred by means of rollers in the cycloidal gears. This means that our RV gears feature high efficiency, a long service life and extremely low backlash. The virtually symmetrical gear design and the roller bearing support of all shafts guarantee constant operating behaviour throughout their entire life cycle. In addition, they allow temporary load peaks of up to 5 times the specified rated torque, such as those that can occur in emergency stop situations.
Our RV series has become established for use in a wide range of applications over the past years, for example in robotics, machine tool construction, solar technology and also in palletising applications.
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Our gearheads are filled at the factory with the optimal lubricant and sealed, so they are ready for installation when they are delivered to our customers. The gears can therefore be installed directly in the machine or system as a plug-and-play solution.
From the beginning we have developed and produced custom products for the individual requirements of our clients. Today, we are going even one step further with customising.
是否这是一个drive train or a cover, a motor flange or an input gear:
there are many details which one can adapt in order to match our gears exactly to your application. With a team of experienced development engineers and our service team in Düsseldorf we can implement all these requirements quickly and professionally.
Rotary indexers and positioners are additional external robot axes for positioning of workpieces. A positioner normally has several axes, for example one for turning and one for pivoting the workpieces. The rotary movement is generally carried out by rotary indexers. Rotary indexers are therefore often installed as components in positioners. If the application requires a pivot axis, the tables can also be used separately. Conventional rotary indexers are usually equipped with worm gearboxes, which show signs of wear over time, due to their inherent design. Cycloidal gearboxes on the other hand are designed to operate with very little wear and with extremely low backlash of less than one arcminute. Even after extended periods the increase in backlash is negligible.
The two-stage reduction ratio of cycloidal gearboxes is what makes Nabtesco solutions so successful. The reason: The speed is reduced by the double cam. The two-stage reduction principle and the low mass inertia minimize vibrations. In addition, the eccentric roller construction achieves very even distribution of the force, which ensures minimal hysteresis losses and enormous resistance to shock loads.
Axial load capacity: 14,700 N – 88,200 N | Precision: Hysteresis loss < 1 arcmin | High torsional rigidity for exact positioning in dynamic cycles | Very robust | The innovative alternative to servo driven rotary indexers
The RS series was developed especially for the positioning of heavy loads. These gearheads with hollow shaft have an integrated bevel gear and a stable, durable construction.
The high-precision Trochoid gear units of the RS series with integrated angular gearbox are designed for axial loads of up to 9 t. A cast-iron base ensures a stable, durable floor mounting. The motor is mounted at right angles and is thus easily accessible. With its compact design and exceptional power, the RS series hollow shaft gearboxes are far superior to conventional camshaft and worm gearboxes.
何氏llow shaft makes it easy to perform supply lines and cables. In addition, these gear heads work almost free of play. This makes the RS series suitable for a wide range of demanding applications such as machine tools, welding table positioning and turntables as well as large robots.
Areas of application of RS gearheads with hollow shaft:
We developed the RS series specifically for positioning heavy loads. These hollow-shaft gearheads feature an integrated right-angle gearbox and sturdy, heavy-duty construction.
We developed the RS series specifically for positioning heavy loads. These hollow-shaft gearheads feature an integrated right-angle gearbox and sturdy, heavy-duty construction.
We developed the RS series specifically for positioning heavy loads. These hollow-shaft gearheads feature an integrated right-angle gearbox and sturdy, heavy-duty construction.
A look at the diverse applications in which Nabtesco gears are used shows that they cut a good figure – and not only on paper. Whether in robotics or packaging technology, wind power installations or machine tools, antenna construction or medical technology: Our precision gears are used in applications that require exact positioning and absolute reliability.
Especially for automation in general mechanical engineering, cycloidal gear technology is a real efficiency booster, since the high precision and power density of the gearboxes makes it possible to shorten processing times, improve product quality, increase productivity and reduce costs. As an automation specialist Nabtesco delivers flexible, high-performance and future viable solutions that combine excellent performance and cost-effectiveness with maximum user convenience.
There are numerous areas where car manufacturers and suppliers can boost efficiency in the production of electric vehicles. Underestimated in the past, although decisive is the choice of gear technology. Gearboxes are a central element in the drive train and play a central part in the performance of machines and systems.
Motorised drives provide for extreme precision in the handling of patients and in imaging processes such as X-ray, MRI or ultrasonic examinations. These applications require positioning accuracy within a tolerance of millimetres or even less. Since the machines are used for examining human patients, safety margins are extremely important in the case of a malfunction. Nabtesco cycloidal gears are the ideal choice!
An important focus at Nabtesco is on the development of special gears for high-speed handling and robot-assisted positioning. Robots for pick & place applications and for workpiece positioning operate in industrial environments at ever increasing speeds, which also puts a strain on the gears installed in such systems. In addition to the high acceleration and braking forces of these machines, the engineers also have to be aware of heat generation from the high speeds. Our precision gears fulfil these requirements!
Precision is the top priority in the construction of machine tools: Blanks and tools must be positioned quickly and with micron precision. Complete machining in one single clamping operation prevents inaccuracies that can occur as a result of frequent reclamping of the workpiece.
The compact cycloidal gears from Nabtesco are a proven design for the exact positioning of chain or disc magazines. Compared to planetary gears, their design makes them considerably more precise with less wear and greater reliability. Cycloidal gears also have more compact dimensions. Nabtesco gears have a similar performance level as torque motors, especially for traveling axes, tool changers or CNC rotary tables. However, the reduced energy consumption causes a significantly better economic solution.
Hygiene and safety are the top priorities in food production and packaging applications. Compliance with extremely stringent hygiene standards is required in the handling, positioning and packaging of foodstuffs. In addition, these applications are becoming more dynamic, faster and more precise. Our cycloidal gears of the RF-P and RH-N series easily fulfil these requirements.
The alignment of large parabolic antennas, such as those used for communication with near-Earth satellites, requires high positioning accuracy. This applies both to the azimuth (the angle between the meridian and vertical plane of a celestial body) and the angle of elevation. The control of these antennas, which have dish diameters of up to 17 metres, requires high torsional and moment rigidity in addition to high reduction ratios. Nabtesco’s compact RV-C hollow shaft gear sets are ideal for this application.
Robotic welding systems have to operate with high speed and absolute precision. Positioners and rotary indexers provide for exact alignment of the workpieces. In welding positioners, a precision gear drives the horizontal rotary axis. This makes it possible to weld all spots along this axis – even complex geometrical structures – within a tolerance of tenths of millimetres, without having to reclamp the workpiece. The weld puddle must be kept exactly in the tray. Nabtesco cycloidal gears are designed for such applications.
Motorized drives provide for extreme precision in the handling of patients and in imaging processes such as X-ray, MRI or ultrasonic examinations. These applications require positioning accuracy within a tolerance of millimetres or even less. Since the machines are used for examining human patients, safety margins are extremely important in the case of a malfunction. Nabtesco cycloidal gears are the ideal choice!
Skilled workers in automotive production work many hours every day in a demanding environment. This necessitates an increased focus on workplace ergonomics in the automotive sector. A new variable 2-axis positioner from Nabtesco helps to boost ergonomics: The RSX-40K rotary table allows the operator to move the workpiece or assembly to the optimal height and position for machining.
Nabtesco offers an extensive portfolio of cycloidal gears as well as drive concepts for a wide range of applications. For your applications we can also develop customised gears that are adapted to your exact requirements. An example is a drive concept for an automated guided vehicle. Learn more here!
We develop ultramodern gear concepts with or without a hollow shaft that feature robustness, durability, speed, high radial loads and exceptional precision. Since our gear systems are designed with quality and reliability in mind to ensure a long life, more than nine million precision gears from Nabtesco are used in such diverse fields as robotics, machine tool manufacturing, handling applications and medical engineering. A market share of 60% in the robotic sector make Nabtesco the world market leader!