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Many “gears” are used for automobiles, but they are also used for many various other machines. The most typical one may be the “tranny” that conveys the energy of engine to tires. There are broadly two roles the transmission of a car plays : one is definitely 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 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 per minute (17 – 67 per second). Since it is impossible to rotate tires with the same rotation rate to run, it is necessary to lessen the rotation speed utilizing the ratio of the number of gear teeth. Such a role is named deceleration; the ratio of the rotation acceleration of engine and that of tires is called the reduction ratio.
Then, exactly why is it necessary to change 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 large 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. Therefore, one adjusts its result by changing the decrease ratio employing a transmission.
The transmission of motive power through gears quite definitely resembles the principle of leverage (a lever). The ratio of the amount of the teeth of gears meshing with each other can be deemed as the ratio of the space of levers’ arms. That is, if the reduction ratio is large and the rotation acceleration as output is lower in comparison compared to that as insight, the power output by tranny (torque) will be large; if the rotation quickness as output isn’t 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 transmission is much comparable to the principle of moving things.
Then, how does a transmitting modify the reduction ratio ? The answer is based on the mechanism called a planetary equipment mechanism.
A planetary gear mechanism is a gear system comprising 4 components, namely, sunlight gear A, several world gears B, internal equipment C and carrier D that connects planet gears as observed in the graph below. It has a very complex structure rendering its design or production most difficult; it can understand the high decrease ratio through gears, however, it is a mechanism suited to 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, which allows high speed reduction to be achieved with relatively small gears and lower inertia reflected back again to the motor. Having multiple teeth share the load also enables planetary gears to transmit high levels of torque. The mixture of compact size, huge speed decrease and high torque tranny makes planetary gearboxes a favorite choice for space-constrained applications.
But planetary gearboxes perform involve some disadvantages. Their complexity in design and manufacturing tends to make them a far more expensive answer than various other gearbox types. And precision production is extremely important for these gearboxes. If one planetary equipment is put closer to the sun gear compared to the others, imbalances in the planetary gears may appear, leading to premature wear and failure. Also, the small footprint of planetary gears makes heat dissipation more difficult, therefore applications that operate at very high speed or experience continuous procedure may require cooling.
When using a “standard” (i.e. inline) planetary gearbox, the motor and the driven equipment must be inline with one another, although manufacturers offer right-angle designs that integrate other gear sets (often bevel gears with helical the teeth) to provide an offset between your 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 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 electric motor technology, providing restricted integration of the engine to the unit. Design features include mounting any servo motors, standard low backlash, high torsional stiffness, 95 to 97% efficiency and calm running.
They can be purchased 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 solid shaft or ISO 9409-1 flange, for mounting to rotary or indexing tables, pinion gears, pulleys or other drive elements with no 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.
Typical applications for these reducers include precision rotary axis drives, traveling gantries & columns, material handling axis drives and digital line shafting. Industries served 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 noise, making them the many accurate and efficient planetaries obtainable. Standard planetary design has three planet gears, with a higher torque version using four planets also available, please see the Reducers with Result Flange chart on the machine Ratings tab under the “+” unit sizes.
Bearings: Optional result bearing configurations for app specific radial load, axial load and tilting second reinforcement. Oversized tapered roller bearings are standard for the ISO Flanged Reducers.
Housing: Single piece metal housing with integral ring gear provides higher concentricity and eliminate speed fluctuations. The housing can be installed with a ventilation module to increase input speeds and lower operational temperature ranges.
Output: Available in a good shaft with optional keyway or an ISO 9409-1 flanged interface. You can expect an array of standard pinions to install directly 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 driven load, the swiftness vs. time profile for the routine, and any other exterior forces acting on the axis.
For application & selection planetary gear reduction assistance, please call, fax or email us. The application info 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 product offering contains both In-Line and Right-Angle configurations, built with the look goal of offering 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 collection provides 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 ratings 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 an excellent 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
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
Additional motion control applications requiring a Ever-Power input/output
Spur gears are a type of cylindrical gear, with shafts that are parallel and coplanar, and the teeth that are straight and oriented parallel to the shafts. They’re arguably the simplest and most common type of gear – simple to manufacture and ideal for an array of applications.
One’s tooth of a spur gear ‘ve got an involute profile and mesh one 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. 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 includes a profile this is actually the involute of a circle, which means that since two gears mesh, they speak to at a person point where the involutes satisfy. This aspect motions 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 base circles. Therefore, the gears adhere to the essential regulation of gearing, which statements that the ratio of the gears’ angular velocities must stay continuous throughout the mesh.
Spur gears could be produced from metals such as for example steel or brass, or from plastics such as nylon or polycarbonate. Gears produced from plastic produce less audio, but at the difficulty of power and loading capability. Unlike other equipment types, spur gears don’t encounter high losses due to slippage, therefore they often times have high transmission overall performance. Multiple spur gears can be employed in series ( known as a gear teach ) to achieve 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 reverse directions. Internal gears, on the other hand, have tooth that are cut inside surface area of the cylinder. An external gear sits in the internal gear, and the gears rotate in the same direction. Because the shafts are positioned closer together, internal gear assemblies are smaller sized than external equipment assemblies. Internal gears are primarily used for planetary gear drives.
Spur gears are generally viewed as best for applications that want speed reduction and torque multiplication, such as ball mills and crushing equipment. Examples of high- velocity applications that use spur gears – despite their high noise levels – include consumer appliances such as washers 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.