Planetary Gear Reduction

Many “gears” are used for automobiles, but they are also used for many additional machines. The most typical one is the “transmitting” that conveys the energy of engine to tires. There are broadly two roles the transmission of a car plays : one is certainly to decelerate the high rotation speed emitted by the engine to transmit to tires; the various other is to change the reduction ratio relative to the acceleration / deceleration or generating speed of an automobile.
The rotation speed of an automobile’s engine in the general state of driving amounts to 1 1,000 – 4,000 rotations per minute (17 – 67 per second). Since it is extremely hard to rotate tires with the same rotation velocity to perform, it is required to lessen the rotation speed using the ratio of the amount of gear teeth. Such a role is named deceleration; the ratio of the rotation swiftness of engine and that of wheels is called the reduction ratio.
Then, exactly why is it necessary to modify the reduction ratio relative to the acceleration / deceleration or driving speed ? This is because substances require a large force to begin moving however they usually do not require this kind of a big force to keep moving once they have started to move. Automobile can be cited as an example. An engine, however, by its nature can’t so finely change its output. For that reason, 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 number 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 swiftness as output is low in comparison to that as insight, the energy output by transmission (torque) will be large; if the rotation velocity as output isn’t so lower in comparison compared to that as insight, on the other hand, the power output by tranny (torque) will be small. Thus, to change the decrease ratio utilizing transmission is much akin to the theory of moving things.
After that, how does a tranny change the reduction ratio ? The answer is based on the system called a planetary equipment mechanism.
A planetary gear system is a gear system consisting of 4 components, namely, sunlight gear A, several world gears B, internal equipment C and carrier D that connects world gears as seen in the graph below. It has a very complex framework rendering its style or production most challenging; it can recognize the high reduction ratio through gears, however, it really is a mechanism suitable for a reduction system that requires both little size and powerful such as for example transmission for automobiles.
In a planetary gearbox, many teeth are engaged at once, which allows high speed decrease to be achieved with relatively small gears and lower inertia reflected back 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, large speed reduction 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 can make them a far more expensive alternative than additional gearbox types. And precision production is extremely important for these gearboxes. If one planetary gear is put closer to sunlight gear than the others, imbalances in the planetary gears may appear, leading to premature wear and failing. Also, the compact footprint of planetary gears makes temperature dissipation more difficult, so applications that operate at high speed or encounter continuous operation may require cooling.
When utilizing a “standard” (i.e. inline) planetary gearbox, the motor and the powered equipment must be inline with each other, although manufacturers offer right-angle designs that incorporate other gear sets (frequently bevel gears with helical the teeth) 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 is dependent 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 (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 make use of with state-of-the-art servo electric motor technology, providing restricted integration of the electric motor to the unit. Style features include installation any servo motors, regular low backlash, high torsional stiffness, 95 to 97% efficiency and tranquil running.
They are available in nine sizes with decrease 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 components without the need for a coupling. For high precision applications, backlash amounts down to 1 arc-minute are available. Right-angle and insight shaft versions of the reducers are also available.
Usual applications for these reducers include precision rotary axis drives, traveling gantries & columns, materials handling axis drives and electronic line shafting. Industries served include Material Managing, 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 most accurate and efficient planetaries available. Standard planetary style has three planet gears, with a higher torque version using four planets also obtainable, please start to see the Reducers with Output Flange chart on the machine Ratings tab beneath the “+” unit sizes.
Bearings: Optional result bearing configurations for application specific radial load, axial load and tilting instant reinforcement. Oversized tapered roller bearings are standard for the ISO Flanged Reducers.
Housing: Single piece steel housing with integral ring gear provides higher concentricity and get rid of speed fluctuations. The casing can be installed with a ventilation module to increase input speeds and lower operational temps.
Output: Available in a good shaft with optional keyway or an ISO 9409-1 flanged interface. We offer a wide variety of standard pinions to mount directly to the output design of your choice.
Unit Selection
These reducers are usually selected predicated on the peak cycle forces, which usually happen during accelerations and decelerations. These cycle forces depend on the driven load, the velocity 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. Your application details will be reviewed by our engineers, who will recommend the best solution for your application.
Ever-Power Automation’s Gearbox product lines offer high precision at affordable prices! The Planetary Gearbox item offering includes both In-Line and Right-Angle configurations, built with the design goal of offering a cost-effective gearbox, without sacrificing quality. These Planetary Gearboxes are available in sizes from 40mm to 180mm, ideal for motors Planetary Gear Reduction ranging from NEMA 17 to NEMA 42 and bigger. The Spur Gearbox line offers an efficient, cost-effective choice appropriate for 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 compatible with most Servo,
SureGear Planetary Gearboxes for Little Ever-Power Motors
The SureGear PGCN series is a superb gearbox value for servo, stepper, and other motion 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 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 certainly are a type of cylindrical equipment, with shafts that are parallel and coplanar, and the teeth that are directly and oriented parallel to the shafts. They’re arguably the easiest and most common type of gear – simple to manufacture and ideal for a range of applications.
One’s teeth of a spur gear ‘ve got an involute profile and mesh a single tooth simultaneously. The involute type implies that spur gears simply generate radial forces (no axial forces), nevertheless the method of tooth meshing causes ruthless on the gear the teeth and high noise creation. For this reason, spur gears are usually utilized for lower swiftness applications, although they can be utilized at nearly every speed.
An involute gear tooth carries 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 in fact 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 usually tangent to both foundation circles. Therefore, the gears stick to the fundamental regulation of gearing, which statements that the ratio of the gears’ angular velocities must stay continuous through the entire mesh.
Spur gears could be produced from metals such as for example metal or brass, or from plastics such as nylon or polycarbonate. Gears produced from plastic produce much less audio, but at the trouble of power and loading capacity. Unlike other products types, spur gears don’t encounter high losses because of slippage, so they often times have high transmission overall performance. 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 one’s teeth that are cut externally surface of the cylinder. Two exterior gears mesh with one another and rotate in opposing directions. Internal gears, in contrast, have tooth that are cut inside surface area of the cylinder. An exterior gear sits within the internal gear, and the gears rotate in the same path. Because the shafts sit closer together, internal equipment assemblies are smaller sized than external gear assemblies. Internal gears are primarily used for planetary equipment drives.
Spur gears are usually viewed as best for applications that want speed decrease and torque multiplication, such as for example ball mills and crushing gear. Examples of high- velocity applications that make use of spur gears – despite their high noise levels – include consumer home appliances such as washing machines and blenders. Even though noise limits the use of spur gears in passenger automobiles, they are generally found in aircraft engines, trains, and even bicycles.

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