Many “gears” are utilized for automobiles, however they are also utilized for many various other machines. The most typical one may be the “tranny” 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 swiftness emitted by the engine to transmit to tires; the various other is to change the reduction ratio in accordance with the acceleration / deceleration or generating speed of a car.
The rotation speed of an automobile’s engine in the general state of traveling amounts to at least one 1,000 – 4,000 rotations per minute (17 – 67 per second). Since it is unattainable to rotate tires with the same rotation velocity to perform, it is necessary to lessen the rotation speed utilizing the ratio of the amount of gear teeth. This kind of a role is named deceleration; the ratio of the rotation speed of engine and that of wheels is called the reduction ratio.
Then, exactly why is it necessary to change the reduction ratio in accordance with the acceleration / deceleration or driving speed ? This is because substances need a large force to begin moving however they do not require such a large force to keep moving once they have began to move. Automobile could be cited as a good example. An engine, however, by its character 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 quite definitely resembles the principle of leverage (a lever). The ratio of the amount of the teeth of gears meshing with one another can be considered as the ratio of the distance of levers’ arms. That’s, if the reduction ratio is huge and the rotation swiftness 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 is not so low in comparison compared to that as input, on the other hand, the energy output by transmission (torque) will be small. Thus, to improve the decrease ratio utilizing transmitting is much comparable to the principle of moving things.
Then, how does a transmitting change the reduction ratio ? The answer is based on the mechanism called a planetary equipment mechanism.
A planetary gear system is a gear mechanism consisting of 4 components, namely, sunlight gear A, several world gears B, internal gear C and carrier D that connects planet gears as observed in the graph below. It has a very complex structure rendering its style or production most challenging; it can recognize the high reduction ratio through gears, however, it is a mechanism suitable for a reduction system that requires both small size and powerful such as transmission for automobiles.
In a planetary gearbox, many teeth are involved at once, which allows high speed reduction to be performed with fairly small gears and lower inertia reflected back again to the motor. Having multiple teeth share the load also allows planetary gears to transmit high levels of torque. The combination of compact size, large speed decrease and high torque transmission makes planetary gearboxes a favorite 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 solution than additional gearbox types. And precision manufacturing is really important for these gearboxes. If one planetary gear is positioned closer to the sun gear compared to the others, imbalances in the planetary gears can occur, leading to premature wear and failure. Also, the small footprint of planetary gears makes warmth dissipation more difficult, so applications that run at high speed or experience planetary gear reduction continuous procedure may require cooling.
When utilizing a “standard” (i.e. inline) planetary gearbox, the motor and the powered equipment must be inline with one another, although manufacturers offer right-angle designs that include 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 linked 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 (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 electric 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. These were specifically developed for make use of with state-of-the-art servo motor technology, providing tight integration of the motor to the unit. Style features include installation any servo motors, standard low backlash, high torsional stiffness, 95 to 97% efficiency and noiseless running.
They are available in nine sizes with decrease ratios from 3:1 to 600:1 and result 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 components with no need for a coupling. For high precision applications, backlash levels down to 1 arc-minute are available. Right-angle and insight shaft versions of these reducers are also available.
Standard applications for these reducers include precision rotary axis drives, traveling gantries & columns, materials 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 & ground gearing with minimal wear, low backlash and low sound, making them the the majority of accurate and efficient planetaries obtainable. Standard planetary style has three planet gears, with a higher torque edition using four planets also offered, please see the Reducers with Result Flange chart on the Unit Ratings tab under the “+” unit sizes.
Bearings: Optional result bearing configurations for application specific radial load, axial load and tilting second reinforcement. Oversized tapered roller bearings are standard for the ISO Flanged Reducers.
Housing: Single piece metal housing with integral ring gear provides higher concentricity and remove speed fluctuations. The housing can be installed with a ventilation module to increase 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 selection of standard pinions to install directly to the output style of your choice.
Unit Selection
These reducers are usually selected based on the peak cycle forces, which often happen during accelerations and decelerations. These cycle forces rely on the driven load, the quickness vs. time profile for the routine, and any other external 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 products offer high precision at affordable prices! The Planetary Gearbox item offering contains 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, well suited for motors which range from NEMA 17 to NEMA 42 and bigger. The Spur Gearbox line provides 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 so are compatible with most Servo,
SureGear Planetary Gearboxes for Small Ever-Power Motors
The SureGear PGCN series is a good gearbox value for servo, stepper, and other movement 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 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 certainly are a type of cylindrical gear, with shafts that are parallel and coplanar, and the teeth that are straight and oriented parallel to the shafts. They’re arguably the easiest and most common kind of gear – simple to manufacture and suitable for a range of applications.
One’s teeth of a spur gear ‘ve got an involute profile and mesh one tooth at the same time. The involute type implies that spur gears just generate radial forces (no axial forces), nevertheless the approach to tooth meshing causes high pressure on the gear the teeth and high noise creation. Because of this, spur gears are often used for lower swiftness applications, although they can be utilized at almost every speed.
An involute equipment 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 a person point where the involutes satisfy. This aspect actions along the tooth areas as the gears rotate, and the kind of force ( known as the line of activities ) is usually tangent to both bottom 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 for example nylon or polycarbonate. Gears manufactured from plastic produce much less sound, but at the trouble of power and loading capability. Unlike other equipment types, spur gears don’t encounter high losses because of slippage, therefore they often times 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 one’s teeth that are cut externally surface area of the cylinder. Two exterior gears mesh with one another and rotate in opposite directions. Internal gears, in contrast, have the teeth that are cut inside surface of the cylinder. An external gear sits within the internal gear, and the gears rotate in the same direction. Because the shafts sit closer together, internal equipment assemblies are smaller sized than external gear assemblies. Internal gears are primarily used for planetary gear drives.
Spur gears are usually viewed as best for applications that require speed decrease and torque multiplication, such as ball mills and crushing equipment. Examples of high- velocity applications that use spur gears – despite their high noise amounts – include consumer devices such as washers and blenders. And while noise limits the use of spur gears in passenger automobiles, they are often used in aircraft engines, trains, and even bicycles.