Many “gears” are utilized for automobiles, but they are also utilized for many additional machines. The most typical one is the “tranny” that conveys the power of engine to tires. There are broadly two roles the transmission of an planetary gear reduction Automobile plays : one is definitely to decelerate the high rotation velocity emitted by the engine to transmit to tires; the other is to improve the reduction ratio relative to the acceleration / deceleration or driving speed of a car.
The rotation speed of an automobile’s engine in the overall state of driving amounts to at least one 1,000 – 4,000 rotations per minute (17 – 67 per second). Because it is unattainable to rotate tires with the same rotation rate to run, it is necessary 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 wheels is named the reduction ratio.
Then, exactly why is it necessary to change the reduction ratio in accordance with the acceleration / deceleration or driving speed ? The reason being substances require a large force to begin moving however they do not require such a huge force to excersice once they have started to move. Automobile could be cited as an example. An engine, nevertheless, by its character can’t so finely change its output. Consequently, 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 number of teeth 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 rate as output is lower in comparison to that as insight, the energy output by transmission (torque) will be large; if the rotation swiftness as output is not so low in comparison compared to that as insight, on the other hand, the energy output by transmission (torque) will be small. Thus, to improve the decrease ratio utilizing transmitting is much akin to the principle of moving things.
Then, how does a transmission change the reduction ratio ? The answer is based on the mechanism called a planetary gear mechanism.
A planetary gear mechanism is a gear system comprising 4 components, namely, sun 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 structure rendering its style or production most difficult; it can recognize the high decrease ratio through gears, however, it is a mechanism suitable for a reduction system that requires both little size and powerful such as transmission for automobiles.
In a planetary gearbox, many teeth are engaged at once, that allows high speed decrease to be performed with fairly small gears and lower inertia reflected back again to the electric motor. Having multiple teeth discuss 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 favorite choice for space-constrained applications.
But planetary gearboxes perform involve some disadvantages. Their complexity in design and manufacturing tends to make them a more expensive alternative than additional gearbox types. And precision production is extremely 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, resulting in premature wear and failure. Also, the compact footprint of planetary gears makes high temperature dissipation more difficult, so applications that run 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 should be inline with one another, although manufacturers provide right-angle designs that incorporate other gear sets (frequently bevel gears with helical 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 is dependent on the drive configuration.
2 Max input speed related 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 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 powerful, precise positioning and repeatability. These were specifically developed for use with state-of-the-art servo motor technology, providing restricted integration of the electric motor to the unit. Design features include installation any servo motors, standard low backlash, high torsional stiffness, 95 to 97% efficiency and tranquil 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 could be provided with a good 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 are available. Right-angle and insight shaft versions of the reducers are also offered.
Common applications for these reducers include precision rotary axis drives, traveling gantries & columns, materials 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 & surface 
gearing with minimal wear, low backlash and low sound, making them the many accurate and efficient planetaries available. Standard planetary design has three world gears, with an increased torque edition using four planets also obtainable, please see the Reducers with Output Flange chart on the machine Ratings tab under the “+” unit sizes.
Bearings: Optional output bearing configurations for application particular radial load, axial load and tilting minute reinforcement. Oversized tapered roller bearings are standard for the ISO Flanged Reducers.
Housing: Single piece metal housing with integral band gear provides better concentricity and eliminate speed fluctuations. The housing can be fitted with a ventilation module to increase input speeds and lower operational temps.
Output: Available in a good shaft with optional keyway or an ISO 9409-1 flanged interface. You can expect a wide selection of standard pinions to attach directly to the output design of your choice.
Unit Selection
These reducers are typically selected predicated on the peak cycle forces, which usually happen during accelerations and decelerations. These routine forces depend on the driven load, the swiftness vs. period profile for the routine, and any other external forces acting on the axis.
For application & selection assistance, please call, fax or email us. Your application information will be reviewed by our engineers, who’ll recommend the very best solution for the application.
Ever-Power Automation’s Gearbox products offer high precision at affordable prices! The Planetary Gearbox item offering includes both In-Line and Right-Angle configurations, built with the design goal of offering a cost-effective gearbox, without sacrificing quality. These Planetary Gearboxes can be found in sizes from 40mm to 180mm, ideal for motors which range from NEMA 17 to NEMA 42 and larger. The Spur Gearbox collection offers an efficient, cost-effective option compatible with Ever-Power Automation’s AC Induction Gear Motors. Ever-Power Automation’s Gearboxes are offered in up to 30 different gear ratios, with torque rankings up to 10,488 in-lbs (167,808 oz-in), and are appropriate for most Servo,
SureGear Planetary Gearboxes for Little Ever-Power Motors
The SureGear PGCN series is a great gearbox value for servo, stepper, and other movement 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 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 gear, 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 a range of applications.
One’s the teeth of a spur gear ‘ve got an involute profile and mesh one tooth at the same time. The involute type means that spur gears simply generate radial forces (no axial forces), nevertheless the approach to tooth meshing causes high pressure on the gear one’s teeth and high sound creation. For this reason, spur gears are often utilized for lower swiftness applications, although they could be utilized at almost every speed.
An involute gear 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 in fact 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 actions ) is definitely tangent to both foundation 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 for example steel or brass, or from plastics such as for example nylon or polycarbonate. Gears manufactured from plastic produce much less audio, but at the trouble of power and loading capability. Unlike other gear types, spur gears don’t encounter high losses because of slippage, therefore they often times have high transmission functionality. Multiple spur gears can be utilized in series ( known as a gear teach ) to attain large reduction ratios.
There are two primary types of spur gears: external and internal. Exterior gears have one’s teeth that are cut externally surface area of the cylinder. Two external gears mesh with each other and rotate in opposing directions. Internal gears, on the other hand, have teeth that are cut inside surface of the cylinder. An exterior gear sits in the internal gear, and the gears rotate in the same direction. Because the shafts sit closer together, internal gear 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 want speed decrease and torque multiplication, such as ball mills and crushing gear. Types of high- velocity applications that make use of spur gears – despite their high noise amounts – include consumer devices 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.
