Many “gears” are utilized for automobiles, however they are also used for many other machines. The most typical one is the “tranny” that conveys the power of engine to tires. There are broadly two functions the transmission of an automobile plays : one can be to decelerate the high rotation speed emitted by the engine to transmit to tires; the various other is to change the reduction ratio in accordance with the acceleration / deceleration or driving speed of an automobile.
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). Since it is impossible to rotate tires with the same rotation acceleration to run, it is necessary to lower the rotation speed using the ratio of the number of gear teeth. Such a role is called deceleration; the ratio of the rotation swiftness of engine and that of tires is named the reduction ratio.
Then, 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 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, however, by its character can’t so finely alter its output. For that reason, one adjusts its output by changing the reduction ratio utilizing a transmission.
The transmission of motive power through gears quite definitely resembles the planetary gear reduction principle of leverage (a lever). The ratio of the amount 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 speed as output is low in comparison compared to that as input, the energy output by tranny (torque) will be huge; if the rotation acceleration as output is not so low in comparison to that as insight, on the other hand, the power output by tranny (torque) will be little. Thus, to improve the reduction ratio utilizing transmitting is much akin to the principle of moving things.
After that, how does a tranny modify the reduction ratio ? The answer is based on the mechanism called a planetary equipment mechanism.
A planetary gear system is a gear system consisting of 4 components, namely, sunlight gear A, several planet gears B, internal gear C and carrier D that connects world gears as seen in the graph below. It has a very complex framework rendering its design or production most challenging; it can realize the high reduction ratio through gears, nevertheless, 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 involved at once, which allows high speed decrease to be performed with relatively small gears and lower inertia reflected back to the electric motor. Having multiple teeth share the load also enables planetary gears to transmit high levels of torque. The mixture of compact size, large speed reduction and high torque transmission makes planetary gearboxes a favorite choice for space-constrained applications.
But planetary gearboxes do have some disadvantages. Their complexity in design and manufacturing tends to make them a far more expensive alternative than various other gearbox types. And precision production is really important for these gearboxes. If one planetary gear is put closer to sunlight gear than the others, imbalances in the planetary gears may appear, resulting in premature wear and failing. Also, the small footprint of planetary gears makes high temperature dissipation more difficult, therefore applications that run at high speed or experience continuous operation may require cooling.
When utilizing a “standard” (i.electronic. inline) planetary gearbox, the motor and the driven equipment should be inline with one another, although manufacturers offer right-angle designs that incorporate other gear sets (frequently bevel gears with helical the teeth) 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 would depend 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 (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 electric motor input SAE C or D hydraulic
Precision Planetary Reducers
This standard range of Precision Planetary Reducers are ideal for use in applications that demand high performance, precise positioning and repeatability. These were specifically developed for make use of with state-of-the-art servo electric motor technology, providing tight 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 silent running.
They are available in nine sizes with reduction ratios from 3:1 to 600:1 and result 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 these reducers are also obtainable.
Normal applications for these reducers include precision rotary axis drives, traveling gantries & columns, material 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 & 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 version using four planets also offered, please see the Reducers with Result Flange chart on the Unit Ratings tab beneath the “+” unit sizes.
Bearings: Optional output bearing configurations for software specific radial load, axial load and tilting minute reinforcement. Oversized tapered roller bearings are standard 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 fitted with a ventilation module to improve insight speeds and lower operational temperatures.
Output: Available in a good shaft with optional keyway or an ISO 9409-1 flanged interface. We offer an array of standard pinions to mount right to the output style of your choice.
Unit Selection
These reducers are typically selected based on the peak cycle forces, which often happen during accelerations and decelerations. These routine forces depend on the driven load, the acceleration vs. time profile for the cycle, and any other exterior forces functioning on the axis.
For application & selection assistance, please call, fax or email us. The application information will be reviewed by our engineers, who’ll recommend the very best solution for the application.
Ever-Power Automation’s Gearbox product lines offer high precision in affordable prices! The Planetary Gearbox product offering contains both In-Line and Right-Angle configurations, built with the design goal of supplying a cost-effective gearbox, without sacrificing quality. These Planetary Gearboxes can be found in sizes from 40mm to 180mm, well suited for motors ranging 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 can be found in up to 30 different gear ratios, with torque rankings up to 10,488 in-lbs (167,808 oz-in), and so are compatible with 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 includes 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 tooth that are directly and oriented parallel to the shafts. They’re arguably the simplest and most common type of gear – easy to manufacture and ideal for an array of applications.
One’s the teeth of a spur gear have got an involute profile and mesh 1 tooth simultaneously. The involute type implies that spur gears just 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 can be utilized at almost every speed.
An involute apparatus tooth carries a profile this is the involute of a circle, which implies that since two gears mesh, they get in touch with at a person point where 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 bottom circles. Hence, the gears stick to the essential 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 metallic or brass, or from plastics such as for example nylon or polycarbonate. Gears manufactured from plastic produce less audio, but at the trouble of power and loading capacity. Unlike other tools types, spur gears don’t encounter high losses due to slippage, therefore they often have high transmission functionality. Multiple spur gears can be utilized in series ( known as a equipment 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 exterior gears mesh with one another and rotate in opposing directions. Internal gears, in contrast, have tooth that are cut on the inside surface of the cylinder. An exterior gear sits inside the internal gear, and the gears rotate in the same path. Because the shafts are positioned closer together, internal equipment 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 decrease and torque multiplication, such as ball mills and crushing equipment. Examples of high- velocity applications that make use of spur gears – despite their high noise amounts – include consumer appliances such as washing machines 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.
