Many “gears” are used for automobiles, but they are also utilized for many various other machines. The most frequent one may be the “transmission” that conveys the power of engine to tires. There are broadly two functions the transmission of an automobile plays : one is usually to decelerate the high rotation acceleration emitted by the engine to transmit to tires; the additional is to change the reduction ratio in accordance with the acceleration / deceleration or generating speed of a car.
The rotation speed of an automobile’s engine in the general state of traveling amounts to at least one 1,000 – 4,000 rotations per minute (17 – 67 per second). Because it is difficult to rotate tires with the same rotation swiftness to run, it is required to lower the rotation speed utilizing the ratio of the number of gear teeth. This kind of a role is called deceleration; the ratio of the rotation swiftness of engine and that of tires is named 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 need a large force to begin moving however they usually do not require this kind of a big force to keep moving once they have began to move. Automobile could be cited as a good example. An engine, nevertheless, 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 number of teeth of gears meshing with each other can be deemed as the ratio of the distance of levers’ arms. That is, if the reduction ratio is huge and the rotation rate as output is low in comparison to that as insight, the power output by transmitting (torque) will be huge; if the rotation rate as output is not so lower in comparison to that as input, however, the energy output by tranny (torque) will be small. Thus, to change the reduction ratio utilizing transmitting is much comparable to the principle of moving things.
After that, how does a transmission modify the reduction ratio ? The answer lies in the mechanism called a planetary equipment mechanism.
A planetary gear mechanism is a gear mechanism consisting of 4 components, namely, sunlight gear A, several world gears B, internal gear C and carrier D that connects world gears as observed in the graph below. It has a very complex framework rendering its design or production most challenging; it can understand the high decrease ratio through gears, nevertheless, it is a mechanism suitable for a reduction mechanism that requires both little 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 reduction to be achieved with fairly small gears and lower inertia reflected back again to the electric motor. Having multiple teeth reveal the load also enables planetary gears to transmit high levels of torque. The combination of compact size, large speed reduction and high torque tranny makes planetary gearboxes a popular choice for space-constrained applications.
But planetary gearboxes perform involve some disadvantages. Their complexity in style and manufacturing can make them a more expensive option than other gearbox types. And precision production is really important for these gearboxes. If one planetary equipment is put closer to sunlight gear compared to the others, imbalances in the planetary gears may appear, leading to premature wear and failing. Also, the small footprint of planetary gears makes temperature dissipation more difficult, so applications that operate at very high speed or experience continuous procedure may require cooling.
When using a “standard” (i.electronic. inline) planetary gearbox, the motor and the driven equipment should be inline with each other, although manufacturers provide right-angle designs that integrate other gear sets (frequently 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 output 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 engine 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 engine technology, providing tight integration of the engine to the unit. Style features include mounting any servo motors, regular low backlash, high torsional stiffness, 95 to 97% efficiency and peaceful 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 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 components with no need for a coupling. For high precision applications, backlash amounts down to 1 arc-minute can be found. Right-angle and insight shaft versions of the reducers are also offered.
Typical 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 & ground gearing with minimal use, low backlash and low sound, making them the most accurate and efficient planetaries offered. Standard planetary style has three planet gears, with a higher torque edition using four planets also available, please start to see the Reducers with Result Flange chart on the Unit Ratings tab beneath the “+” unit sizes.
Bearings: Optional output bearing configurations for application particular radial load, axial load and tilting moment reinforcement. Oversized tapered roller bearings are regular for the ISO Flanged Reducers.
Housing: Single piece metal housing with integral ring gear provides better concentricity and eliminate speed fluctuations. The casing can be fitted with a ventilation module to increase insight speeds and lower operational temperatures.
Result: Available in a solid shaft with optional keyway or an ISO 9409-1 flanged interface. We offer a wide variety of standard pinions to install directly to the output design of your choice.
Unit Selection
These reducers are typically selected predicated on the peak cycle forces, which often happen during accelerations and decelerations. These routine forces depend on the driven load, the speed vs. time profile for the routine, and any other exterior forces functioning on the axis.
For application & selection assistance, please call, fax or email us. Your application information will be reviewed by our engineers, who will recommend the best solution for the application.
Ever-Power Automation’s Gearbox products offer high precision at affordable prices! The Planetary Gearbox item offering contains both In-Line and Right-Position 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 which range from NEMA 17 to NEMA 42 and bigger. The Spur Gearbox series 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 different gear ratios, with torque ratings up to 10,488 in-pounds (167,808 oz-in), and are compatible with most Servo,
SureGear Planetary Gearboxes for Small Ever-Power Motors
The SureGear PGCN series is a superb gearbox value for servo, stepper, and other movement control applications requiring a NEMA size input/output interface. It includes the best quality designed 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 available for mounting to other motors
planetary gear reduction 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 teeth that are straight 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 tooth of a spur gear ‘ve got an involute profile and mesh a single tooth simultaneously. The involute type implies that spur gears just generate radial forces (no axial forces), nevertheless the method of tooth meshing causes ruthless on the gear the teeth and high noise creation. Because of this, spur gears are often used for lower swiftness applications, although they could be utilized at almost every speed.
An involute equipment 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 movements along the tooth areas as the gears rotate, and the type of force ( known as the line of actions ) is usually tangent to both foundation circles. Hence, the gears stick 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 metallic or brass, or from plastics such as for example nylon or polycarbonate. Gears produced from plastic produce less sound, but at the difficulty of power and loading capability. Unlike other products types, spur gears don’t encounter high losses because of slippage, so they often have high transmission efficiency. 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 the teeth that are cut externally surface area of the cylinder. Two exterior gears mesh with each other and rotate in reverse directions. Internal gears, in contrast, have tooth that are cut inside surface of the cylinder. An exterior gear sits in the internal gear, 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 mainly used for planetary gear drives.
Spur gears are usually seen as best for applications that want speed reduction and torque multiplication, such as for example ball mills and crushing equipment. Examples 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 generally used in aircraft engines, trains, and even bicycles.