Many “gears” are utilized for automobiles, but they are also used for many additional machines. The most frequent one is the “transmission” that conveys the power of engine to 
tires. There are broadly two functions the transmission of a car plays : one is definitely to decelerate the high rotation quickness emitted by the engine to transmit to tires; the additional is to change the reduction ratio relative to the acceleration / deceleration or generating speed of an automobile.
The rotation speed of an automobile’s engine in the overall state of generating amounts to at least one 1,000 – 4,000 rotations each and every minute (17 – 67 per second). Because it is extremely hard to rotate tires with the same rotation acceleration to run, it is necessary to lessen 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 acceleration of engine and that of tires is called the reduction ratio.
Then, exactly why is it necessary to modify the reduction ratio relative to the acceleration / deceleration or driving speed ? It is because substances require a large force to begin moving however they do not require this kind of a large force to keep moving once they have started to move. Automobile can be cited as a good example. An engine, nevertheless, by its nature can’t so finely change its output. Consequently, one adjusts its result 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 amount of teeth of gears meshing with each other can be deemed as the ratio of the length of levers’ arms. That’s, if the decrease ratio is huge and the rotation quickness as output is lower in comparison compared to that as insight, the energy output by transmission (torque) will be huge; if the rotation acceleration as output isn’t so lower in comparison compared to that as insight, on the other hand, the energy output by tranny (torque) will be small. Thus, to improve the decrease ratio utilizing transmission is much comparable to the basic principle of moving things.
Then, how does a transmission alter the reduction ratio ? The answer is based on the system called a planetary gear mechanism.
A planetary gear system is a gear mechanism consisting of 4 components, namely, sunlight gear A, several world gears B, internal equipment C and carrier D that connects world gears as observed in the graph below. It has a very complex framework rendering its style or production most challenging; it can realize the high reduction ratio through gears, nevertheless, it really is a mechanism suited to a reduction mechanism that requires both small size and high performance such as for example transmission for automobiles.
In a planetary gearbox, many teeth are engaged at once, which allows high speed reduction to be achieved with fairly small gears and lower inertia reflected back again to the motor. Having multiple teeth discuss the load also enables planetary gears to transmit high levels of torque. The combination of compact size, huge speed reduction and high torque transmission makes planetary gearboxes a popular choice for space-constrained applications.
But planetary gearboxes do have some disadvantages. Their complexity in design and manufacturing can make them a far more expensive solution than additional gearbox types. And precision production is really important for these gearboxes. If one planetary gear is positioned closer to the sun gear than the others, imbalances in the planetary gears may appear, resulting in premature wear and failing. Also, the compact footprint of planetary gears makes heat dissipation more difficult, so applications that operate at very high speed or experience continuous operation may require cooling.
When using a “standard” (i.e. inline) planetary gearbox, the motor and the driven equipment planetary gear reduction should be inline with one another, although manufacturers offer right-angle designs that include 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 would depend on the drive configuration.
2 Max input speed related 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 (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 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. They were specifically developed for use with state-of-the-art servo engine technology, providing limited integration of the electric motor to the unit. Design features include mounting any servo motors, regular low backlash, high torsional stiffness, 95 to 97% efficiency and calm running.
They can be purchased in nine sizes with reduction ratios from 3:1 to 600:1 and output torque capacities up to 16,227 lb.ft. The output could be provided with a good 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 right down to 1 arc-minute are available. Right-angle and input shaft versions of these reducers are also available.
Standard applications for these reducers include precision rotary axis drives, traveling gantries & columns, material 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 & ground gearing with minimal wear, low backlash and low noise, making them the most accurate and efficient planetaries available. Standard planetary design 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 under the “+” unit sizes.
Bearings: Optional output 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 steel housing with integral ring gear provides higher concentricity and remove speed fluctuations. The housing can be installed with a ventilation module to improve insight speeds and lower operational temperature ranges.
Output: Available in a good shaft with optional keyway or an ISO 9409-1 flanged interface. We offer a wide range of standard pinions to mount right 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 routine forces rely on the driven load, the rate vs. time profile for the routine, and any other exterior forces acting on the axis.
For application & selection assistance, please call, fax or email us. Your application information will be examined by our engineers, who’ll recommend the very best solution for the 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, perfect for motors ranging from NEMA 17 to NEMA 42 and larger. The Spur Gearbox series 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 equipment ratios, with torque ratings up to 10,488 in-pounds (167,808 oz-in), and are compatible with most Servo,
SureGear Planetary Gearboxes for Little Ever-Power Motors
The SureGear PGCN series is a good gearbox value for servo, stepper, and other motion control applications requiring a NEMA size input/output interface. It provides 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
Free of maintenance; 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 tooth 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 simply generate radial forces (no axial forces), nevertheless the approach to tooth meshing causes ruthless on the gear the teeth and high noise creation. For this reason, spur gears are usually used for lower swiftness applications, although they could be utilized at nearly every speed.
An involute gear tooth includes a profile this is actually the involute of a circle, which implies that since two gears mesh, they get in touch with at an individual point where the involutes meet. This aspect motions along the tooth areas as the gears rotate, and the type of force ( referred to as the line of activities ) is certainly tangent to both bottom circles. Therefore, the gears adhere 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 be produced from metals such as metallic or brass, or from plastics such as nylon or polycarbonate. Gears produced from plastic produce much less audio, but at the trouble of power and loading capability. Unlike other products types, spur gears don’t encounter high losses because of slippage, therefore they often times have high transmission performance. Multiple spur gears can be employed in series ( referred to as a gear teach ) to attain 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 of the cylinder. Two external gears mesh with one another and rotate in reverse directions. Internal gears, in contrast, have the teeth that are cut inside surface area of the cylinder. An exterior gear sits in the internal gear, and the gears rotate in the same path. Because the shafts sit closer together, internal equipment assemblies are more compact than external gear assemblies. Internal gears are mainly used for planetary equipment drives.
Spur gears are generally seen as best for applications that require speed reduction and torque multiplication, such as for example ball mills and crushing gear. Examples of high- velocity applications that use spur gears – despite their high noise levels – include consumer devices such as washers and blenders. And while noise limits the utilization of spur gears in passenger automobiles, they are generally used in aircraft engines, trains, and even bicycles.
