Many “gears” are utilized for automobiles, but they are also utilized for many additional machines. The most typical one may be the “transmitting” that conveys the power of engine to tires. There are broadly two functions the transmission of a car plays : one is to decelerate the high rotation rate emitted by the engine to transmit to tires; the various other is to change the reduction ratio relative to the acceleration / deceleration or traveling speed of an automobile.
The rotation speed of an automobile’s engine in the general state of traveling 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 swiftness to run, it is required to lessen the rotation speed using the ratio of the number of gear teeth. Such a role is named deceleration; the ratio of the rotation speed of engine and that of wheels is called the reduction ratio.
Then, why is it necessary to modify the reduction ratio relative to the acceleration / deceleration or driving speed ? This is because substances require a large force to start moving however they do not require this kind of a sizable force to keep moving once they have started to move. Automobile can be cited as a good example. An engine, nevertheless, by its character can’t so finely modify its output. Therefore, one adjusts its output 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 the teeth of gears meshing with each other can be considered as the ratio of the distance of levers’ arms. That’s, if the reduction ratio is large and the rotation velocity as output is low in comparison compared to that as insight, the energy output by tranny (torque) will be large; if the rotation velocity as output isn’t so low in comparison to that as input, on the other hand, the power output by tranny (torque) will be little. Thus, to improve the reduction ratio utilizing tranny is much comparable to the principle of moving things.
After that, how does a transmission alter the reduction ratio ? The answer lies in the system called a planetary gear mechanism.
A planetary gear mechanism is a gear mechanism 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 includes a very complex framework rendering its design or production most difficult; it can understand the high decrease ratio through gears, nevertheless, it is a mechanism suited to a reduction system that requires both little size and high performance such as transmission for automobiles.
In a planetary gearbox, many teeth are involved at once, which allows high speed decrease to be achieved with relatively small gears and lower inertia reflected back to the motor. Having multiple teeth discuss the load also allows planetary gears to transmit high levels of torque. The combination of compact size, huge 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 can make them a more expensive alternative than various other gearbox types. And precision manufacturing is extremely important for these gearboxes. If one planetary equipment is positioned closer to the sun gear compared to the others, imbalances in the planetary gears may appear, leading to premature wear and failure. Also, the compact footprint of planetary gears makes heat dissipation more difficult, therefore applications that operate at very high speed or encounter continuous procedure 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 offer right-angle designs that incorporate other gear sets (frequently bevel gears with helical tooth) 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 would depend 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 (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 engine input SAE C or D hydraulic
Precision Planetary Reducers
This standard selection of Precision Planetary Reducers are ideal for use in applications that demand high performance, precise positioning and repeatability. These were specifically developed for use with state-of-the-art servo electric motor technology, providing tight integration of the electric motor to the unit. Style features include mounting any servo motors, standard low backlash, high torsional stiffness, 95 to 97% efficiency and quiet 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 mounting to rotary or indexing tables, pinion gears, pulleys or other drive elements without the need for a coupling. For high precision applications, backlash levels right down to 1 arc-minute are available. Right-angle and insight shaft versions of the reducers are also offered.
Normal applications for these reducers include precision rotary axis drives, traveling gantries & columns, material handling axis drives and digital line shafting. Industries served include Material Managing, Automation, Aerospace, Machine Tool and Robotics.
Unit Design &
Construction
Gearing: Featuring case-hardened & surface gearing with minimal put on, low backlash and low sound, making them the many accurate and efficient planetaries obtainable. Standard planetary style has three planet gears, with an increased torque edition using four planets also obtainable, please see the Reducers with Result Flange chart on the Unit Ratings tab under 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 installed with a ventilation module to increase insight speeds and lower operational temperatures.
Output: Available in a solid shaft with optional keyway or an ISO 9409-1 flanged interface. We offer a wide variety of standard Planetary Gear Reduction pinions to install 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 powered load, the speed vs. time profile for the cycle, and any other external forces functioning on the axis.
For application & selection assistance, please call, fax or email us. The application details will be examined 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 item offering contains both In-Line and Right-Position configurations, built with the look 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 line provides an efficient, cost-effective choice 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-lbs (167,808 oz-in), and so 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 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
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
Various 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 the teeth that are directly and oriented parallel to the shafts. They’re arguably the simplest and most common type of gear – simple to manufacture and suitable for a range of applications.
One’s tooth of a spur gear have got an involute profile and mesh 1 tooth simultaneously. The involute type implies that spur gears simply generate radial forces (no axial forces), however the approach to tooth meshing causes ruthless on the gear one’s teeth and high noise creation. For this reason, spur gears are usually used for lower swiftness applications, although they could be utilized at almost every speed.
An involute products tooth includes a profile this is the involute of a circle, which implies that since two gears mesh, they get in touch with at an individual point where the involutes satisfy. This aspect movements along the tooth areas as the gears rotate, and the kind of force ( known as the line of activities ) is tangent to both base circles. Hence, 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 for example metal 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 capacity. Unlike other products types, spur gears don’t encounter high losses due to slippage, therefore they often have high transmission efficiency. Multiple spur gears can be employed in series ( known as a equipment teach ) to attain large reduction ratios.
There are two primary types of spur gears: external and internal. Exterior gears have got the teeth that are cut externally surface of the cylinder. Two external gears mesh with each other and rotate in opposite directions. Internal gears, on the other hand, have teeth that are cut inside surface of the cylinder. An exterior gear sits within the internal equipment, and the gears rotate in the same path. Because the shafts are positioned closer together, internal gear assemblies are smaller sized than external equipment assemblies. Internal gears are mainly used for planetary gear drives.
Spur gears are generally viewed as best for applications that want speed reduction 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 levels – include consumer appliances such as washing machines and blenders. And while noise limits the utilization of spur gears in passenger automobiles, they are often used in aircraft engines, trains, and even bicycles.