Planetary Gear Reduction

Many “gears” are utilized for automobiles, however they are also utilized for many additional machines. The most typical one may be the “transmitting” that conveys the power of engine to tires. There are broadly two roles the transmission of a car plays : one is definitely to decelerate the high rotation acceleration emitted by the engine to transmit to tires; the additional is to improve the reduction ratio in accordance with the acceleration / deceleration or driving speed of an automobile.
The rotation speed of an automobile’s engine in the overall state of traveling 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 quickness to perform, it is required to lower the rotation speed utilizing the ratio of the amount of gear teeth. Such a role is called deceleration; the ratio of the rotation quickness of engine and that of tires is named the reduction ratio.
Then, why is it necessary to modify the reduction ratio relative to the acceleration / deceleration or driving speed ? It is because substances require a large force to start moving however they usually do not require this kind of a large force to excersice once they have started to move. Automobile can be cited as a good example. An engine, however, by its character can’t so finely alter its output. Therefore, one adjusts its output by changing the reduction ratio employing 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 space of levers’ arms. That’s, if the reduction ratio is huge and the rotation quickness as output is lower in comparison compared to that as insight, the energy output by tranny (torque) will be huge; if the rotation velocity as output isn’t so low in comparison compared to that as insight, however, the energy output by transmission (torque) will be little. Thus, to change the reduction ratio utilizing transmission is much comparable to the principle of moving things.
After that, how does a transmitting change the reduction ratio ? The answer lies in the system called a planetary equipment mechanism.
A planetary gear system is a gear mechanism comprising 4 components, namely, sun gear A, several world gears B, internal equipment C and carrier D that connects world gears as observed in the graph below. It includes a very complex framework rendering its design or production most challenging; it can recognize the high decrease ratio through gears, however, it is a mechanism suitable for a reduction system that requires both small size and powerful such as transmission for automobiles.
In a planetary gearbox, many teeth are involved at once, that allows high speed reduction to be achieved with relatively small gears and lower inertia reflected back again to the electric motor. Having multiple teeth reveal the load also allows planetary gears to transmit high degrees of torque. The mixture of compact size, large speed decrease and high torque tranny makes planetary gearboxes a popular choice for space-constrained applications.
But planetary gearboxes do have some disadvantages. Their complexity in design and manufacturing tends to make them a more expensive alternative than various other gearbox types. And precision production is really important for these gearboxes. If one planetary equipment is put closer to the sun gear than the others, imbalances in the planetary gears can occur, leading to premature wear and failing. Also, the small footprint of planetary gears makes temperature dissipation more difficult, so applications that run at very high speed or experience continuous operation may require cooling.
When using 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 integrate other gear sets (often bevel gears with helical the teeth) to supply 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 related 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 motor input SAE C or D hydraulic
Precision Planetary Reducers
This standard range 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 motor technology, providing restricted integration of the engine to the unit. Style 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 decrease ratios from 3:1 to 600:1 and result torque capacities up to 16,227 lb.ft. The output can 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 without the need for a coupling. For high precision applications, backlash amounts right down to 1 arc-minute can be found. Right-angle and insight shaft versions of these reducers are also obtainable.
Normal applications for these reducers include precision rotary axis drives, traveling gantries & columns, material handling axis drives and digital line shafting. Industries served include Material Handling, Automation, Aerospace, Machine Tool and Robotics.
Unit Design &
Construction
Gearing: Featuring case-hardened & ground Planetary Gear Reduction Gearing with minimal use, low backlash and low noise, making them the most accurate and efficient planetaries obtainable. Standard planetary style has three world gears, with a higher torque edition using four planets also available, please see the Reducers with Result Flange chart on the Unit Ratings tab under the “+” unit sizes.
Bearings: Optional result bearing configurations for software specific radial load, axial load and tilting second reinforcement. Oversized tapered roller bearings are regular for the ISO Flanged Reducers.
Housing: Single piece steel housing with integral band gear provides greater concentricity and eliminate speed fluctuations. The casing can be installed with a ventilation module to improve insight speeds and lower operational temperature ranges.
Result: Available in a good shaft with optional keyway or an ISO 9409-1 flanged interface. We offer an array of standard pinions to mount right to the output style of your choice.
Unit Selection
These reducers are usually selected based on the peak cycle forces, which often happen during accelerations and decelerations. These routine forces rely on the powered load, the swiftness vs. time profile for the cycle, and any other exterior forces functioning on the axis.
For application & selection assistance, please call, fax or email us. The application information will be reviewed by our engineers, who will recommend the very best solution for the application.
Ever-Power Automation’s Gearbox products offer high precision in affordable prices! The Planetary Gearbox product offering includes both In-Line and Right-Angle configurations, built with the look goal of supplying a cost-effective gearbox, without sacrificing quality. These Planetary Gearboxes can be found in sizes from 40mm to 180mm, perfect for motors which range from NEMA 17 to NEMA 42 and larger. The Spur Gearbox collection provides 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-pounds (167,808 oz-in), and 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 motion control applications requiring a NEMA size input/output interface. It provides the best quality available 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
Various 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 tooth that are straight and oriented parallel to the shafts. They’re arguably the easiest and most common type of gear – easy to manufacture and ideal for an array of applications.
One’s the teeth of a spur gear have got an involute profile and mesh a single tooth simultaneously. The involute type means that spur gears simply generate radial forces (no axial forces), however the method of tooth meshing causes ruthless on the gear the teeth and high sound creation. For this reason, spur gears are usually used for lower swiftness applications, although they can be utilized at almost every speed.
An involute devices tooth includes a profile this is the involute of a circle, which implies that since two gears mesh, they speak to at an individual point where the involutes meet. This aspect actions along the tooth areas as the gears rotate, and the type of force ( referred to as the line of activities ) is usually tangent to both bottom circles. Therefore, the gears adhere to the essential regulation of gearing, which promises 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 nylon or polycarbonate. Gears manufactured from plastic produce much less audio, but at the difficulty of power and loading capability. Unlike other gear types, spur gears don’t encounter high losses due to slippage, so they often have high transmission performance. Multiple spur gears can be employed in series ( known as a equipment teach ) to achieve large reduction ratios.
There are two primary types of spur gears: external and internal. Exterior gears have the teeth that are cut externally surface of the cylinder. Two exterior gears mesh with one another and rotate in reverse directions. Internal gears, on the other hand, have tooth that are cut inside surface area of the cylinder. An exterior gear sits in 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 equipment assemblies. Internal gears are primarily used for planetary gear drives.
Spur gears are usually viewed as best for applications that require speed decrease and torque multiplication, such as ball mills and crushing equipment. Types of high- velocity applications that use spur gears – despite their high noise levels – include consumer home appliances such as washers and blenders. Even though noise limits the use of spur gears in passenger automobiles, they are often found in aircraft engines, trains, and even bicycles.

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