Planetary Gear Reduction

Many “gears” are used for automobiles, but they are also used for many additional machines. The most frequent one may be the “tranny” that conveys the power of engine to tires. There are broadly two functions the transmission of a car plays : one can be to decelerate the high rotation velocity 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 general state of generating amounts to 1 1,000 – 4,000 rotations per minute (17 – 67 per second). Since it is impossible to rotate tires with the same rotation quickness to perform, it is required to lower the rotation speed using the ratio of the amount of gear teeth. Such a role is called deceleration; the ratio of the rotation speed of engine and that of wheels is called the reduction ratio.
Then, exactly why is it necessary to modify the reduction ratio in accordance with the acceleration / deceleration or driving speed ? The reason being substances require a large force to start moving however they usually do not require such a big force to keep moving once they have began to move. Automobile can be cited as an example. An engine, nevertheless, by its nature can’t so finely modify its output. As a result, one adjusts its output by changing the decrease ratio utilizing a transmission.
The transmission of motive power through gears quite definitely resembles the principle of leverage (a lever). The ratio of the amount of tooth of gears meshing with one another can be deemed as the ratio of the length of levers’ arms. That is, if the reduction ratio is huge and the rotation speed as output is lower in comparison to that as input, the energy output by transmitting (torque) will be large; if the rotation acceleration as output is not so lower in comparison to that as insight, however, the energy output by transmission (torque) will be little. Thus, to improve the decrease ratio utilizing tranny is much akin to the theory of moving things.
Then, how does a tranny modify 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, sun gear A, several planet gears B, internal gear C and carrier D that connects planet gears as observed in the graph below. It has a very complex framework rendering its style or production most difficult; it can realize the high decrease ratio through gears, however, it is a mechanism suitable for a reduction system that requires both small size and high performance such as for example transmission for automobiles.
In a planetary gearbox, many teeth are involved at once, which allows high speed decrease to be performed with relatively small gears and lower inertia reflected back again to the engine. Having multiple teeth talk about the load also allows planetary gears to transmit high degrees 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 can make them a far more expensive alternative than 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 may appear, resulting in premature wear and failure. Also, the small footprint of planetary gears makes high temperature dissipation more difficult, so applications that operate at high speed or experience continuous operation may require cooling.
When using a “standard” (i.electronic. inline) planetary gearbox, the motor and the driven equipment must be inline with one another, although manufacturers provide right-angle designs that include other gear sets (often 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 is dependent on the drive configuration.
2 Max input speed linked 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 (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 engine input SAE C or D hydraulic
Precision Planetary Reducers
This standard range of Precision Planetary Reducers are ideal for use in applications that demand powerful, precise positioning and repeatability. They were specifically developed for make use of with state-of-the-art servo electric motor technology, providing limited integration of the engine to the unit. Design features include mounting 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 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 levels down to 1 arc-minute can be found. Right-angle and insight shaft versions of these reducers are also offered.
Usual applications for these reducers include precision rotary axis drives, traveling gantries & columns, material 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 & floor gearing with minimal wear, low backlash and low noise, making them the most accurate and efficient planetaries offered. Standard planetary design has three world gears, with a higher torque edition using four planets also offered, please see the Reducers with Output Flange chart on the Unit Ratings tab beneath the “+” unit sizes.
Bearings: Optional result bearing configurations for app particular radial load, axial load and tilting minute 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 get rid of speed fluctuations. The housing can be installed with a ventilation module to improve insight 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 selection of standard pinions to install right to the output style of your choice.
Unit Selection
These reducers are usually selected predicated on the peak cycle forces, which often happen during accelerations and decelerations. These cycle forces rely on the powered load, the acceleration vs. time profile for the routine, and any other external forces functioning on the axis.
For application & selection assistance, please call, fax or email us. The application info will be examined by our engineers, who’ll recommend the very best solution for your 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 design goal of supplying a cost-effective gearbox, without sacrificing quality. These Planetary Gearboxes are available in sizes from 40mm to 180mm, perfect for motors ranging from NEMA 17 to NEMA 42 and bigger. The Spur Gearbox range provides an efficient, cost-effective option compatible with Ever-Power Automation’s AC Induction Gear Motors. Ever-Power Automation’s Gearboxes can be found in up to 30 Planetary Gear Reduction 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 offers the best quality designed 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 certainly 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 easiest and most common type of gear – easy to manufacture and suitable for a range of applications.
One’s tooth of a spur gear ‘ve got an involute profile and mesh a single tooth at the same time. The involute type means that spur gears simply generate radial forces (no axial forces), however the method of tooth meshing causes high pressure on the gear the teeth and high noise creation. Because of this, spur gears are usually utilized for lower swiftness applications, although they could be utilized at nearly every speed.
An involute tools tooth carries a profile this is the involute of a circle, which means that since two gears mesh, they get in touch with at a person point where the involutes fulfill. This aspect actions along the tooth areas as the gears rotate, and the type of force ( referred to as the line of actions ) is usually tangent to both bottom circles. Hence, the gears adhere 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 possibly be produced from metals such as for example metallic or brass, or from plastics such as for example nylon or polycarbonate. Gears produced from plastic produce 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, therefore they often times have high transmission efficiency. Multiple spur gears can be utilized in series ( known as a gear teach ) to realize large reduction ratios.
There are two primary types of spur gears: external and internal. Exterior gears possess 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 teeth that are cut on the inside surface of the cylinder. An external gear sits in the internal gear, and the gears rotate in the same path. Because the shafts sit closer together, internal gear assemblies are more compact 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 reduction and torque multiplication, such as for example ball mills and crushing equipment. Examples of high- velocity applications that make use of spur gears – despite their high noise amounts – include consumer home appliances such as washers and blenders. And while noise limits the use of spur gears in passenger automobiles, they are often found in aircraft engines, trains, and even bicycles.

Tags

As one of leading taper pulley manufacturers, suppliers and exporters of mechanical products, We offer taper pulley and many other products.

Please contact us for details.

Mail:[email protected]

Manufacturer supplier exporter of taper pulley

Recent Posts