Many “gears” are utilized for automobiles, but they are also used for many other machines. The most frequent one may be the “transmitting” that conveys the power of engine to tires. There are broadly two functions the transmission of a car plays : one is certainly to decelerate the high rotation velocity emitted by the engine to transmit to tires; the additional is to improve the reduction ratio relative to the acceleration / deceleration or traveling speed of a car.
The rotation speed of an automobile’s engine in the general state of driving amounts to at least one 1,000 – 4,000 rotations per minute (17 – 67 per second). Because it is not possible to rotate tires with the same rotation acceleration to run, it is required to lessen the rotation speed using the ratio of the number of gear teeth. This kind of a role is called deceleration; the ratio of the rotation quickness of engine and that of tires is called the reduction ratio.
Then, why is it necessary to change the reduction ratio relative to the acceleration / deceleration or driving speed ? The reason being substances need a large force to start moving however they do not Planetary Gear Reduction require this kind of a huge force to keep moving once they have started to move. Automobile could be cited as a good example. An engine, however, by its character 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 amount of the 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 speed as output is lower in comparison to that as insight, the energy output by transmission (torque) will be huge; if the rotation speed as output is not so lower in comparison to that as input, on the other hand, the energy output by transmission (torque) will be little. Thus, to improve the reduction ratio utilizing tranny is much comparable to the principle of moving things.
After that, how does a transmission modify the reduction ratio ? The answer is based on the mechanism called a planetary equipment mechanism.
A planetary gear mechanism 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 seen in the graph below. It has a very complex framework rendering its style or production most difficult; it can understand the high reduction ratio through gears, nevertheless, it is a mechanism suitable for a reduction system that requires both little size and high performance such as transmission for automobiles.
In a planetary gearbox, many teeth are involved at once, that allows high speed decrease to be achieved with relatively small gears and lower inertia reflected back to the motor. Having multiple teeth share the load also enables planetary gears to transmit high levels of torque. The combination of compact size, huge speed reduction and high torque transmission makes planetary gearboxes a popular choice for space-constrained applications.
But planetary gearboxes do have some disadvantages. Their complexity in design and manufacturing can make them a more expensive option than additional gearbox types. And precision manufacturing 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 may appear, leading to 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 procedure may require cooling.
When using a “standard” (i.electronic. inline) planetary gearbox, the motor and the driven equipment must be inline with each other, although manufacturers offer right-angle designs that incorporate other gear sets (often bevel gears with helical tooth) 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 linked to ratio and max result 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 motor input SAE C or D hydraulic
Precision Planetary Reducers
This standard selection of Precision Planetary Reducers are ideal for use in applications that demand powerful, precise positioning and repeatability. They were specifically developed for use with state-of-the-art servo engine technology, providing restricted integration of the engine to the unit. Style features include mounting any servo motors, standard low backlash, high torsional stiffness, 95 to 97% efficiency and tranquil 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 can be provided with a good shaft or ISO 9409-1 flange, for mounting to rotary or indexing tables, pinion gears, pulleys or other drive elements without the need for a coupling. For high precision applications, backlash amounts down to 1 arc-minute are available. Right-angle and input shaft versions of these reducers are also obtainable.
Standard applications for these reducers include precision rotary axis drives, traveling gantries & columns, materials handling axis drives and electronic line shafting. Industries offered include Material Managing, Automation, Aerospace, Machine Tool and Robotics.
Unit Design &
Construction
Gearing: Featuring case-hardened & floor gearing with minimal put on, low backlash and low sound, making them the the majority of accurate and efficient planetaries obtainable. Standard planetary style has three world gears, with an increased torque edition using four planets also available, please see the Reducers with Result Flange chart on the machine Ratings tab under the “+” unit sizes.
Bearings: Optional output bearing configurations for application specific radial load, axial load and tilting moment 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 get rid of speed fluctuations. The casing can be installed with a ventilation module to increase insight speeds and lower operational temperatures.
Output: Available in a solid shaft with optional keyway or an ISO 9409-1 flanged interface. We offer a wide variety of standard pinions to attach directly to the output style of your choice.
Unit Selection
These reducers are typically selected based on the peak cycle forces, which usually happen during accelerations and decelerations. These routine forces depend on the powered load, the quickness vs. time profile for the cycle, and any other external forces functioning on the axis.
For application & selection assistance, please call, fax or email us. The application details 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 at affordable prices! The Planetary Gearbox product offering includes both In-Line and Right-Position 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, ideal for motors ranging from NEMA 17 to NEMA 42 and larger. The Spur Gearbox series provides an efficient, cost-effective choice compatible with 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 Little Ever-Power Motors
The SureGear PGCN series is an excellent 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 variety 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 installation to SureStep stepper motors
Optional shaft bushings designed for mounting to other motors
1-year warranty
Applications
Material handling
Pick and place
Automation
Packaging
Additional 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 the teeth that are directly and oriented parallel to the shafts. They’re arguably the simplest and most common kind of gear – easy to manufacture and ideal for an array of applications.
One’s teeth of a spur gear have got an involute profile and mesh 1 tooth simultaneously. The involute type means that spur gears just generate radial forces (no axial forces), however the approach to tooth meshing causes ruthless on the gear one’s teeth and high noise creation. For this reason, spur gears are often used for lower swiftness applications, although they can be utilized at almost 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 the involutes satisfy. 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 base circles. Hence, the gears adhere to the fundamental regulation of gearing, which promises that the ratio of the gears’ angular velocities must stay continuous through the entire mesh.
Spur gears could be produced from metals such as metal or brass, or from plastics such as for example nylon or polycarbonate. Gears produced from plastic produce less sound, but at the trouble of power and loading capability. Unlike other gear types, spur gears don’t encounter high losses due to slippage, therefore they often have high transmission overall performance. Multiple spur gears can be employed in series ( known as a equipment teach ) to attain 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 exterior gears mesh with each other 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 within 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 gear assemblies. Internal gears are mainly used for planetary gear drives.
Spur gears are usually viewed as best for applications that want speed reduction and torque multiplication, such as ball mills and crushing equipment. Types of high- velocity applications that make use of spur gears – despite their high noise levels – include consumer appliances such as washing machines and blenders. And while noise limits the usage of spur gears in passenger automobiles, they are generally used in aircraft engines, trains, and even bicycles.