Many “gears” are utilized for automobiles, however they are also utilized for many various other machines. The most typical one is the “transmission” that conveys the power of engine to tires. There are broadly two functions the transmission of a car plays : one can be to decelerate the high rotation rate emitted by the engine to transmit to tires; the other is to change the reduction ratio in accordance with 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 extremely hard to rotate tires with the same rotation velocity to run, it is required to lower the rotation speed using the ratio of the number of gear teeth. This kind of a role is named deceleration; the ratio of the rotation rate of engine and that of wheels 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 need a large force to start moving however they usually do not require such a huge 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. As a result, 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 each other can be deemed as the ratio of the length of levers’ arms. That is, if the reduction ratio is large and the rotation speed as output is low in comparison compared to that as input, the power output by tranny (torque) will be large; if the rotation velocity as output is not so lower in comparison to that 
as insight, however, the power output by transmission (torque) will be little. Thus, to change the reduction ratio utilizing tranny is much comparable to the principle of moving things.
Then, how does a transmission change the reduction ratio ? The answer is based on the system called a planetary equipment mechanism.
A planetary gear system is a gear system consisting of 4 components, namely, sunlight gear A, several planet gears B, internal equipment C and carrier D that connects planet gears as seen in the graph below. It has a very complex structure rendering its design or production most challenging; it can understand the high decrease ratio through gears, nevertheless, it really is a mechanism suited to a reduction mechanism that requires both small size and powerful such as for example 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 electric motor. Having multiple teeth share the load also allows planetary gears to transmit high levels of torque. The mixture of compact size, huge speed decrease and high torque tranny 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 planetary gear reduction solution than additional gearbox types. And precision production is really important for these gearboxes. If one planetary gear is put closer to the sun gear than the others, imbalances in the planetary gears may appear, resulting in premature wear and failure. Also, the small footprint of planetary gears makes temperature dissipation more difficult, so applications that operate at high speed or encounter continuous procedure may require cooling.
When using a “standard” (i.e. inline) planetary gearbox, the motor and the powered equipment must be inline with each other, although manufacturers provide right-angle designs that incorporate other gear sets (frequently 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 would depend 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 motor input SAE C or D hydraulic
Precision Planetary Reducers
This standard selection of Precision Planetary Reducers are perfect for use in applications that demand high performance, precise positioning and repeatability. They were specifically developed for use with state-of-the-art servo engine technology, providing restricted 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 peaceful running.
They can be purchased in nine sizes with reduction ratios from 3:1 to 600:1 and result torque capacities up to 16,227 lb.ft. The output can be provided with a solid 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 can be found. Right-angle and insight shaft versions of the reducers are also obtainable.
Normal 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 & surface gearing with minimal use, low backlash and low sound, making them the most accurate and efficient planetaries obtainable. Standard planetary design has three planet gears, with an increased torque edition using four planets also available, please start to see the Reducers with Result Flange chart on the Unit Ratings tab under the “+” unit sizes.
Bearings: Optional result bearing configurations for app particular radial load, axial load and tilting instant reinforcement. Oversized tapered roller bearings are regular for the ISO Flanged Reducers.
Housing: Single piece steel housing with integral ring gear provides better concentricity and get rid of speed fluctuations. The casing can be installed with a ventilation module to improve input speeds and lower operational temperature ranges.
Result: Available in a good shaft with optional keyway or an ISO 9409-1 flanged interface. We offer an array of standard pinions to attach right to the output style of your choice.
Unit Selection
These reducers are typically selected based on the peak cycle forces, which usually happen during accelerations and decelerations. These routine forces depend on the driven load, the velocity 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 details will be reviewed 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 includes both In-Line and Right-Angle 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 which range from NEMA 17 to NEMA 42 and bigger. The Spur Gearbox line 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 rankings 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 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 teeth that are directly and oriented parallel to the shafts. They’re arguably the simplest and most common kind of gear – simple to manufacture and suitable for a range of applications.
One’s teeth of a spur gear have got an involute profile and mesh 1 tooth at the same time. The involute type means that spur gears just generate radial forces (no axial forces), however the method of tooth meshing causes high pressure 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 nearly every speed.
An involute equipment tooth carries 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 movements along the tooth areas as the gears rotate, and the type of force ( referred to as the line of actions ) is usually tangent to both base circles. Hence, the gears stick to the essential regulation of gearing, which claims 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 metal or brass, or from plastics such as for example nylon or polycarbonate. Gears produced from plastic produce less audio, but at the difficulty of power and loading capacity. Unlike other equipment types, spur gears don’t encounter high losses due to slippage, so they often have high transmission overall performance. Multiple spur gears can be employed in series ( known as a gear teach ) to attain 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 of the cylinder. Two exterior gears mesh with one another and rotate in opposing directions. Internal gears, in contrast, have the teeth that are cut on the inside surface area of the cylinder. An external gear sits inside the internal gear, and the gears rotate in the same direction. Because the shafts are positioned closer together, internal equipment assemblies are smaller sized than external equipment assemblies. Internal gears are mainly used for planetary equipment drives.
Spur gears are generally seen as best for applications that require speed decrease and torque multiplication, such as for example 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. Even though noise limits the usage of spur gears in passenger automobiles, they are often used in aircraft engines, trains, and even bicycles.
