Planetary Gear Reduction

Many “gears” are utilized for automobiles, however they are also utilized for many various other machines. The most frequent one is the “tranny” that conveys the power of engine to tires. There are broadly two roles the transmission of a car plays : one is certainly to decelerate the high rotation velocity emitted by the engine to transmit to tires; the various other is to improve the reduction ratio in accordance with the acceleration / deceleration or driving speed of a car.
The rotation speed of an automobile’s engine in the general state of traveling Planetary Gear Reduction amounts to 1 1,000 – 4,000 rotations per minute (17 – 67 per second). Since it is not possible to rotate tires with the same rotation quickness to run, it is required to lower the rotation speed using the ratio of the number of gear teeth. This kind of a role is named deceleration; the ratio of the rotation quickness of engine and that of tires is named the reduction ratio.
Then, why is it necessary to change the reduction ratio in accordance with the acceleration / deceleration or driving speed ? This is because substances need a large force to start moving however they usually do not require such a large force to keep moving once they have started to move. Automobile could be cited as an example. An engine, however, by its nature can’t so finely change its output. Therefore, one adjusts its result by changing the decrease 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 teeth of gears meshing with one another can be deemed as the ratio of the distance of levers’ arms. That’s, if the reduction ratio is large and the rotation quickness as output is lower in comparison to that as insight, the power output by transmitting (torque) will be large; if the rotation quickness as output isn’t so low in comparison to that as insight, on the other hand, the power output by transmitting (torque) will be small. Thus, to change the reduction ratio utilizing transmission is much comparable to the basic principle of moving things.
Then, how does a tranny alter the reduction ratio ? The answer lies in the system called a planetary gear mechanism.
A planetary gear system is a gear mechanism consisting of 4 components, namely, sun gear A, several planet gears B, internal equipment C and carrier D that connects planet gears as seen in the graph below. It includes a very complex structure rendering its style or production most challenging; it can understand the high decrease ratio through gears, however, it is a mechanism suitable for a reduction system that requires both little size and high performance such as for example transmission for automobiles.
In a planetary gearbox, many teeth are engaged at once, that allows high speed reduction to be achieved with fairly small gears and lower inertia reflected back again to the electric motor. Having multiple teeth discuss the load also allows planetary gears to transmit high levels of torque. The combination of compact size, large speed reduction and high torque transmitting makes planetary gearboxes a popular choice for space-constrained applications.
But planetary gearboxes perform have some disadvantages. Their complexity in style and manufacturing tends to make them a more expensive answer than other gearbox types. And precision production is extremely important for these gearboxes. If one planetary equipment is put closer to the sun gear than the others, imbalances in the planetary gears may appear, leading to premature wear and failure. Also, the small footprint of planetary gears makes temperature dissipation more difficult, so applications that run at very high speed or encounter continuous operation may require cooling.
When utilizing a “standard” (i.e. inline) planetary gearbox, the motor and the driven equipment should be inline with each other, although manufacturers offer right-angle designs that incorporate other gear sets (frequently bevel gears with helical tooth) to provide an offset between the 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 would depend on the drive configuration.
2 Max input speed linked to ratio and max result speed
3 Max radial load placed at optimum load position
4 Weight varies with configuration and ratio selected
5 Requires tapered roller planet bearings (unavailable 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 make use of with state-of-the-art servo electric motor technology, providing tight integration of the motor to the unit. Design features include installation any servo motors, standard low backlash, high torsional stiffness, 95 to 97% efficiency and peaceful running.
They can be purchased in nine sizes with reduction ratios from 3:1 to 600:1 and output torque capacities up to 16,227 lb.ft. The output could be provided with a solid shaft or ISO 9409-1 flange, for installation to rotary or indexing tables, pinion gears, pulleys or other drive components with no need for a coupling. For high precision applications, backlash amounts down to 1 arc-minute are available. Right-angle and input shaft versions of the reducers are also available.
Common applications for these reducers include precision rotary axis drives, traveling gantries & columns, materials handling axis drives and digital line shafting. Industries offered include Material Managing, Automation, Aerospace, Machine Tool and Robotics.
Unit Design &
Construction
Gearing: Featuring case-hardened & surface gearing with minimal wear, low backlash and low noise, making them the many accurate and efficient planetaries obtainable. Standard planetary style has three world gears, with a higher torque edition using four planets also offered, please see the Reducers with Output Flange chart on the machine Ratings tab under the “+” unit sizes.
Bearings: Optional output bearing configurations for program specific radial load, axial load and tilting moment reinforcement. Oversized tapered roller bearings are regular for the ISO Flanged Reducers.
Housing: Single piece steel housing with integral band gear provides higher concentricity and get rid of speed fluctuations. The casing can be fitted with a ventilation module to improve insight speeds and lower operational temperature ranges.
Result: Available in a solid shaft with optional keyway or an ISO 9409-1 flanged interface. You can expect a wide range of standard pinions to mount right to the output style of your choice.
Unit Selection
These reducers are typically selected predicated on the peak cycle forces, which usually happen during accelerations and decelerations. These routine forces depend on the powered load, the rate vs. time profile for the cycle, and any other exterior forces acting on the axis.
For application & selection assistance, please call, fax or email us. Your application info will be reviewed by our engineers, who’ll recommend the very best solution for the application.
Ever-Power Automation’s Gearbox products offer high precision at affordable prices! The Planetary Gearbox product offering contains both In-Line and Right-Position configurations, built with the design goal of supplying a cost-effective gearbox, without sacrificing quality. These Planetary Gearboxes can be found in sizes from 40mm to 180mm, well suited for motors which range from NEMA 17 to NEMA 42 and bigger. The Spur Gearbox series offers an efficient, cost-effective choice compatible with Ever-Power Automation’s AC Induction Gear Motors. Ever-Power Automation’s Gearboxes are offered 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 great gearbox value for servo, stepper, and other movement control applications requiring a NEMA size input/output interface. It offers the best quality available for the price point.
Features
Wide range of ratios (5, 10, 25, 50, and 100:1)
Low backlash of 30 arc-min or less
20,000 hour service life
Maintenance free; requires no additional lubrication
NEMA sizes 17, 23, and 34
Includes hardware for mounting to SureStep stepper motors
Optional shaft bushings available for mounting to other motors
1-year warranty
Applications
Material handling
Pick and place
Automation
Packaging
Various 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 directly and oriented parallel to the shafts. They’re arguably the simplest and most common kind of gear – simple to manufacture and ideal for an array of applications.
One’s the teeth of a spur gear have got an involute profile and mesh one tooth at the same time. The involute type implies that spur gears just generate radial forces (no axial forces), however the method of tooth meshing causes high pressure on the gear the teeth and high noise creation. For this reason, spur gears are often utilized for lower swiftness applications, although they can be utilized at nearly every speed.
An involute equipment tooth includes a profile this is actually the involute of a circle, which means that since two gears mesh, they get in touch with at an individual point where the involutes meet. This aspect actions along the tooth areas as the gears rotate, and the type of force ( known as the line of activities ) is tangent to both foundation circles. Therefore, the gears adhere to the fundamental regulation of gearing, which promises that the ratio of the gears’ angular velocities must stay continuous throughout the mesh.
Spur gears could possibly be produced from metals such as for example steel or brass, or from plastics such as nylon or polycarbonate. Gears manufactured from plastic produce less audio, but at the trouble of power and loading capacity. Unlike other apparatus types, spur gears don’t encounter high losses because of slippage, so they often have high transmission performance. Multiple spur gears can be employed in series ( referred to as a gear teach ) to realize large reduction ratios.
There are two primary types of spur gears: external and internal. Exterior gears have got the teeth that are cut externally surface of the cylinder. Two external gears mesh with one another and rotate in opposite directions. Internal gears, in contrast, have teeth that are cut on the inside surface area of the cylinder. An external gear sits inside the internal equipment, and the gears rotate in the same direction. Because the shafts sit closer together, internal equipment assemblies are smaller sized than external equipment assemblies. Internal gears are primarily used for planetary gear drives.
Spur gears are usually viewed as best for applications that want speed reduction and torque multiplication, such as for example ball mills and crushing gear. Types of high- velocity applications that use spur gears – despite their high noise levels – include consumer devices such as washers and blenders. Even though noise limits the use of spur gears in passenger automobiles, they are often used in aircraft engines, trains, and even bicycles.

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