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Planetary Gear Reduction - cardan coupling
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Many “gears” are used for automobiles, however they are also utilized for many other machines. The most typical one is the “transmitting” that conveys the energy of engine to tires. There are broadly two functions the transmission of a car plays : one can be to decelerate the high rotation rate emitted by the engine to transmit to tires; the additional is to improve the reduction ratio in accordance with the acceleration / deceleration or traveling speed of a car.
The rotation speed of an automobile’s engine in the overall state of generating amounts to at least one 1,000 – 4,000 rotations each and every minute (17 – 67 per second). Since it is extremely hard to rotate tires with the same rotation velocity to run, it is required to lessen the rotation speed utilizing the ratio of the amount of gear teeth. This kind of a role is named deceleration; the ratio of the rotation speed of engine and that of wheels is named the reduction ratio.
Then, exactly why is it necessary to modify the reduction ratio in accordance with the acceleration / deceleration or driving speed ? This is because substances need a large force to begin moving however they do not require this kind of a big force to excersice once they have started to move. Automobile could be cited as an example. An engine, nevertheless, by its character can’t so finely alter its output. Consequently, one adjusts its output by changing the reduction ratio utilizing a transmission.
The transmission of motive power through gears very much resembles the principle of leverage (a lever). The ratio of the amount of the teeth of gears meshing with one another can be deemed as the ratio of the length of levers’ arms. That is, if the decrease ratio is huge and the rotation speed as output is low in comparison to that as input, the energy output by transmitting (torque) will be huge; if the rotation speed as output is not so low in comparison to that as input, however, the energy output by transmitting (torque) will be small. Thus, to improve the decrease ratio utilizing transmitting is much akin to the principle of moving things.
After that, how does a tranny alter the reduction ratio ? The answer is based on the mechanism called a planetary gear mechanism.
A planetary gear system is a gear mechanism consisting of 4 components, namely, sunlight gear A, several planet gears B, internal gear C and carrier D that connects planet gears as seen in the graph below. It includes a very complex framework rendering its design or production most challenging; it can recognize the high reduction ratio through gears, nevertheless, it is a mechanism suitable for a reduction system that requires both small size and high performance such as transmission for automobiles.
In a planetary gearbox, many teeth are involved at once, which allows high speed reduction to be performed with relatively small gears and lower inertia reflected back again to the electric motor. Having multiple teeth reveal the load also enables planetary gears to transmit high degrees of torque. The combination of compact size, huge speed decrease and high torque transmitting makes planetary gearboxes a favorite choice for space-constrained applications.
But planetary gearboxes perform have some disadvantages. Their complexity in style and manufacturing tends to make them a far more expensive alternative than various other gearbox types. And precision production is extremely important for these gearboxes. If one planetary gear is positioned closer to the sun gear than the others, imbalances in the planetary gears can occur, resulting in premature wear and failure. Also, the small footprint of planetary gears makes high temperature dissipation more difficult, therefore applications that run at very high speed or experience continuous operation may require cooling.
When utilizing a “standard” (i.electronic. inline) planetary gearbox, the motor and the powered equipment should be inline with each other, although manufacturers offer right-angle designs that include other gear sets (often bevel gears with helical teeth) to supply an offset between your input and output.
Input power (max)27 kW (36 hp)
Input speed (max)2800 rpm2
Output torque (intermittent)12,880 Nm(9,500 lb-ft)
Output torque (continuous)8,135 Nm (6,000 lb-ft)
1 Actual ratio is dependent on the drive configuration.
2 Max input speed related to ratio and max output speed
3 Max radial load positioned at optimum load position
4 Weight varies with configuration and ratio selected
5 Requires tapered roller planet bearings (not available with all ratios)
Approximate dry weight100 -181 kg (220 – 400 lb)4
Radial load (max)14,287kg (31,500 lb)3
Drive typeSpeed reducer
Hydraulic electric motor input SAE C or D hydraulic
Precision Planetary Reducers
This standard selection of Precision Planetary Reducers are perfect for use in applications that demand high performance, precise positioning and repeatability. They were specifically developed for use with state-of-the-art servo motor technology, providing limited integration of the motor to the unit. Design features include mounting any servo motors, regular low backlash, high torsional stiffness, 95 to 97% efficiency and calm running.
They can be purchased in nine sizes with reduction ratios from 3:1 to 600:1 and result torque capacities up to 16,227 lb.ft. The output could be provided with a good shaft or ISO 9409-1 flange, for installation to rotary or indexing tables, pinion gears, pulleys or other drive elements without the need for a coupling. For high precision applications, backlash amounts right down to 1 arc-minute can be found. Right-angle and input shaft versions of these reducers are also offered.
Regular applications for these reducers include precision rotary axis drives, traveling gantries & columns, material handling axis drives and digital line shafting. Industries offered include Material Handling, Automation, Aerospace, Machine Tool and Robotics.
Unit Design &
Construction
Gearing: Featuring case-hardened & surface gearing with minimal put on, low backlash and low sound, making them the many accurate and efficient planetaries obtainable. Standard planetary style has three planet gears, with a higher torque version using four planets also available, please see the Reducers with Output Flange chart on the machine Ratings tab beneath the “+” unit sizes.
Bearings: Planetary Gear Reduction optional result bearing configurations for program specific radial load, axial load and tilting instant reinforcement. Oversized tapered roller bearings are standard for the ISO Flanged Reducers.
Housing: Single piece metal housing with integral band gear provides higher concentricity and remove speed fluctuations. The casing can be installed with a ventilation module to improve insight speeds and lower operational temps.
Result: Available in a solid shaft with optional keyway or an ISO 9409-1 flanged interface. We offer a wide selection of standard pinions to install directly to the output design of your choice.
Unit Selection
These reducers are typically selected predicated on the peak cycle forces, which usually happen during accelerations and decelerations. These cycle forces rely on the driven load, the swiftness vs. period profile for the routine, and any other exterior forces acting on the axis.
For application & selection assistance, please call, fax or email us. The application details will be reviewed by our engineers, who’ll recommend the best solution for the application.
Ever-Power Automation’s Gearbox products offer high precision in affordable prices! The Planetary Gearbox item offering includes both In-Line and Right-Position configurations, built with the look goal of offering a cost-effective gearbox, without sacrificing quality. These Planetary Gearboxes are available in sizes from 40mm to 180mm, well suited for motors which range from NEMA 17 to NEMA 42 and larger. The Spur Gearbox collection offers an efficient, cost-effective choice appropriate for Ever-Power Automation’s AC Induction Gear Motors. Ever-Power Automation’s Gearboxes can be found in up to 30 different equipment ratios, with torque rankings up to 10,488 in-lbs (167,808 oz-in), and so are appropriate for most Servo,
SureGear Planetary Gearboxes for Small Ever-Power Motors
The SureGear PGCN series is a good gearbox value for servo, stepper, and other movement control applications requiring a NEMA size input/output interface. It provides the best quality designed for the price point.
Features
Wide variety of ratios (5, 10, 25, 50, and 100:1)
Low backlash of 30 arc-min or less
20,000 hour service life
Free of maintenance; requires no additional lubrication
NEMA sizes 17, 23, and 34
Includes hardware for mounting to SureStep stepper motors
Optional shaft bushings designed for mounting to other motors
1-year warranty
Applications
Material handling
Pick and place
Automation
Packaging
Other motion control applications requiring a Ever-Power input/output
Spur gears are a type of cylindrical equipment, with shafts that are parallel and coplanar, and tooth that are straight and oriented parallel to the shafts. They’re arguably the easiest and most common kind of gear – simple to manufacture and suitable for a range of applications.
One’s the teeth of a spur gear ‘ve got an involute profile and mesh a single tooth at the same time. The involute type implies that spur gears just generate radial forces (no axial forces), nevertheless the approach to tooth meshing causes ruthless on the gear the teeth and high sound creation. For this reason, spur gears are often utilized for lower swiftness applications, although they could be utilized at almost every speed.
An involute apparatus tooth includes a profile this is the involute of a circle, which implies that since two gears mesh, they get in touch with at an individual point where the involutes satisfy. This aspect actions along the tooth areas as the gears rotate, and the type of force ( referred to as the line of actions ) is certainly tangent to both foundation circles. Hence, the gears stick to the fundamental regulation of gearing, which claims that the ratio of the gears’ angular velocities must stay continuous through the entire mesh.
Spur gears could possibly be produced from metals such as metal or brass, or from plastics such as for example nylon or polycarbonate. Gears manufactured from plastic produce less sound, but at the difficulty of power and loading capability. Unlike other devices types, spur gears don’t encounter high losses because of slippage, therefore they often times have high transmission functionality. Multiple spur gears can be utilized in series ( known as a equipment teach ) to realize large reduction ratios.
There are two primary types of spur gears: external and internal. Exterior gears have got one’s teeth that are cut externally surface area of the cylinder. Two external gears mesh with one another and rotate in opposite directions. Internal gears, in contrast, have the teeth that are cut on the inside surface of the cylinder. An external gear sits inside the internal equipment, and the gears rotate in the same path. Because the shafts are positioned closer together, internal equipment assemblies are smaller sized than external gear assemblies. Internal gears are mainly used for planetary gear drives.
Spur gears are usually viewed as best for applications that require speed reduction and torque multiplication, such as ball mills and crushing equipment. Examples of high- velocity applications that use spur gears – despite their high noise amounts – include consumer appliances such as washers and blenders. Even though noise limits the utilization of spur gears in passenger automobiles, they are generally found in aircraft engines, trains, and even bicycles.