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 energy of engine to tires. There are broadly two functions the transmission of an automobile plays : one is to decelerate the high rotation speed emitted by the engine to transmit to tires; the additional is to change 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 driving amounts to at least one 1,000 – 4,000 planetary gear reduction rotations each and every minute (17 – 67 per second). Since it is difficult to rotate tires with the same rotation acceleration to run, it is required to lower the rotation speed using the ratio of the amount of gear teeth. Such a role is named deceleration; the ratio of the rotation velocity of engine and that of tires is called the reduction ratio.
Then, why is it necessary to modify the reduction ratio in accordance with the acceleration / deceleration or driving speed ? It is because substances require a large force to start moving however they usually do not require such a big 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 modify its output. Therefore, one adjusts its output 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 number of teeth of gears meshing with each other can be deemed as the ratio of the length of levers’ arms. That’s, if the reduction ratio is large and the rotation acceleration as output is low in comparison to that as input, the power output by transmission (torque) will be large; if the rotation acceleration as output is not so lower in comparison compared to that as input, on the other hand, the energy output by transmission (torque) will be small. Thus, to change the decrease ratio utilizing transmission is much akin to the principle of moving things.
Then, how does a tranny alter the reduction ratio ? The answer is based on the mechanism called a planetary equipment mechanism.
A planetary gear mechanism is a gear system consisting of 4 components, namely, sunlight 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 challenging; it can recognize the high decrease ratio through gears, however, it is a mechanism suited to 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 to the motor. Having multiple teeth share the load also enables planetary gears to transmit high degrees of torque. The mixture of compact size, large speed decrease and high torque transmission makes planetary gearboxes a popular choice for space-constrained applications.
But planetary gearboxes do involve some disadvantages. Their complexity in design and manufacturing tends to make them a more expensive remedy than additional gearbox types. And precision manufacturing is really important for these gearboxes. If one planetary gear is positioned closer to sunlight gear compared to the others, imbalances in the planetary gears can occur, resulting in premature wear and failing. Also, the compact footprint of planetary gears makes temperature dissipation more difficult, therefore applications that operate at high speed or experience continuous operation may require cooling.
When utilizing a “standard” (i.e. inline) planetary gearbox, the motor and the driven equipment should be inline with each other, although manufacturers provide right-angle designs that incorporate other gear sets (often bevel gears with helical the teeth) to supply 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 linked to ratio and max result speed
3 Max radial load placed 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 high performance, precise positioning and repeatability. They were specifically developed for make use of with state-of-the-art servo motor technology, providing tight integration of the motor to the unit. Design features include mounting any servo motors, regular low backlash, high torsional stiffness, 95 to 97% efficiency and silent 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 installation to rotary or indexing tables, pinion gears, pulleys or other drive components with no need for a coupling. For high precision applications, backlash amounts right down to 1 arc-minute can be found. Right-angle and input shaft versions of the reducers are also available.
Standard applications for these reducers include precision rotary axis drives, traveling gantries & columns, material handling axis drives and digital 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 noise, making them the the majority of accurate and efficient planetaries available. Standard planetary style has three world gears, with a higher torque edition using four planets also offered, please see the Reducers with Output Flange chart on the machine Ratings tab beneath the “+” unit sizes.
Bearings: Optional result bearing configurations for software particular radial load, axial load and tilting instant 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 get rid of speed fluctuations. The casing can be fitted with a ventilation module to improve insight speeds and lower operational temperature ranges.
Output: Available in a solid shaft with optional keyway or an ISO 9409-1 flanged interface. We offer an array of standard pinions to attach directly to the output style of your choice.
Unit Selection
These reducers are typically selected predicated on the peak cycle forces, which often happen during accelerations and decelerations. These cycle forces depend on the driven load, the swiftness vs. period profile for the cycle, and any other external forces functioning on the axis.
For application & selection assistance, please call, fax or email us. Your application info will be examined by our engineers, who will recommend the very 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-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, well suited for motors ranging from NEMA 17 to NEMA 42 and larger. The Spur Gearbox line offers an efficient, cost-effective choice appropriate for 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-lbs (167,808 oz-in), and 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 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
Free of maintenance; 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 equipment, with shafts that are parallel and coplanar, and teeth that are directly and oriented parallel to the shafts. They’re arguably the easiest and most common type of gear – simple to manufacture and suitable for an array of applications.
One’s tooth of a spur gear have got an involute profile and mesh a single tooth at the same time. The involute type implies that spur gears simply generate radial forces (no axial forces), however the method of tooth meshing causes high pressure 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 tools tooth includes a profile this is the involute of a circle, which means that since two gears mesh, they speak to at a person point where in fact the involutes meet. This aspect movements along the tooth areas as the gears rotate, and the type of force ( referred to as the line of activities ) is tangent to both base circles. Therefore, the gears stick to the fundamental 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 metallic or brass, or from plastics such as for example nylon or polycarbonate. Gears produced from plastic produce much less sound, but at the trouble of power and loading capability. Unlike other gear types, spur gears don’t encounter high losses because of slippage, so they often times have high transmission overall performance. Multiple spur gears can be utilized in series ( known as a gear teach ) to realize large reduction ratios.
There are two primary types of spur gears: external and internal. Exterior gears have got one’s teeth that are cut externally surface area of the cylinder. Two exterior gears mesh with each other and rotate in opposing directions. Internal gears, in contrast, have tooth 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 equipment 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 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 washing machines and blenders. And while noise limits the use of spur gears in passenger automobiles, they are generally found in aircraft engines, trains, and even bicycles.