Many “gears” are utilized for automobiles, however they are also used for many additional machines. The most frequent one may be the “transmission” 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 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 an automobile.
The rotation speed of an automobile’s engine in the general 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 velocity to run, it is required to lessen the rotation speed using the ratio of the amount of gear teeth. This kind of a role is named deceleration; the ratio of the rotation acceleration of engine and that of tires is named the reduction ratio.
Then, why is it necessary to modify 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 usually do not require such a big force to keep moving once they have began to move. Automobile could 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 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 the teeth of gears meshing with each other can be deemed as the ratio of the distance of levers’ arms. That is, if the decrease ratio is large and the rotation acceleration as output is low in comparison compared to that as insight, the energy output by transmission (torque) will be huge; if the rotation rate as output isn’t so low in comparison to that as input, on the other hand, the energy output by transmitting (torque) will be small. Thus, to change the reduction ratio utilizing transmitting is much comparable to the principle of moving things.
Then, how does a transmitting change the reduction ratio ? The answer lies in the mechanism called a planetary gear mechanism.
A planetary gear system is a gear mechanism consisting of 4 components, namely, sun gear A, several planet 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 is a mechanism suitable for a reduction system that requires both small size and powerful such as for example transmission for automobiles.
In a planetary gearbox, many teeth are engaged at once, that allows high speed reduction to be achieved with relatively small gears and lower inertia reflected back again to the motor. Having multiple teeth reveal the load also enables planetary gears to transmit high levels of torque. The combination of compact size, huge speed reduction and high torque tranny makes planetary gearboxes a popular choice for space-constrained applications.
But planetary gearboxes perform involve some disadvantages. Their complexity in design and manufacturing can make them a more expensive alternative than other gearbox types. And precision manufacturing is extremely 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 failure. Also, the compact footprint of planetary gears makes warmth dissipation more difficult, therefore applications that run at high speed or experience continuous procedure may require cooling.
When using a “standard” (i.e. inline) planetary gearbox, the motor and the powered equipment should be inline with one another, although manufacturers offer right-angle designs that incorporate other gear sets (often bevel gears with helical 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 (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. They were Planetary Gear Reduction specifically developed for use with state-of-the-art servo engine technology, providing limited integration of the motor to the unit. Design features include mounting any servo motors, standard low backlash, high torsional stiffness, 95 to 97% efficiency and quiet running.
They are available 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 good shaft or ISO 9409-1 flange, for installation 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 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 electronic line shafting. Industries served include Material Handling, Automation, Aerospace, Machine Tool and Robotics.
Unit Design &
Construction
Gearing: Featuring case-hardened & ground gearing with minimal use, low backlash and low noise, making them the the majority of accurate and efficient planetaries offered. Standard planetary style has three world gears, with a higher torque version using four planets also offered, please start to see the Reducers with Result Flange chart on the Unit Ratings tab beneath the “+” unit sizes.
Bearings: Optional result bearing configurations for app specific radial load, axial load and tilting second reinforcement. Oversized tapered roller bearings are regular for the ISO Flanged Reducers.
Housing: Single piece steel housing with integral band gear provides higher concentricity and get rid of speed fluctuations. The housing can be fitted with a ventilation module to improve input speeds and lower operational temperatures.
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 attach directly to the output style 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 rely on the powered load, the rate vs. period profile for the routine, and any other external forces functioning on the axis.
For application & selection assistance, please call, fax or email us. The application info will be reviewed by our engineers, who will recommend the very best solution for the application.
Ever-Power Automation’s Gearbox products offer high precision at affordable prices! The Planetary Gearbox product 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, perfect for motors ranging from NEMA 17 to NEMA 42 and larger. The Spur Gearbox range provides an efficient, cost-effective option 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 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 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 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
Other 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 tooth that are directly and oriented parallel to the shafts. They’re arguably the easiest and most common kind of gear – simple to manufacture and ideal for an array of applications.
One’s tooth of a spur gear have got an involute profile and mesh 1 tooth at the same time. The involute type means that spur gears simply generate radial forces (no axial forces), nevertheless the method of tooth meshing causes high pressure on the gear the teeth and high noise creation. Because of this, spur gears are often utilized for lower swiftness applications, although they can be utilized at almost every speed.
An involute devices tooth carries 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 satisfy. This aspect movements along the tooth areas as the gears rotate, and the type of force ( known as the line of actions ) can be tangent to both foundation circles. Therefore, the gears stick to the essential 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 metallic or brass, or from plastics such as nylon or polycarbonate. Gears manufactured from plastic produce less sound, but at the trouble of power and loading capability. Unlike other apparatus types, spur gears don’t encounter high losses because of slippage, so they often have high transmission efficiency. 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 have the teeth that are cut externally surface area of the cylinder. Two external gears mesh with one another and rotate in opposite directions. Internal gears, in contrast, have teeth that are cut on the 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 gear drives.
Spur gears are usually viewed as best for applications that require speed decrease and torque multiplication, such as for example ball mills and crushing gear. Types 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 utilization of spur gears in passenger automobiles, they are generally used in aircraft engines, trains, and even bicycles.
