Many “gears” are used for automobiles, but they are also used for many other machines. The most frequent one is 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 acceleration emitted by the engine to transmit to tires; the various other is to improve 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). Since it is difficult to rotate tires with the same rotation quickness to perform, it is required to lessen the rotation speed utilizing the ratio of the number of gear teeth. This kind of a role is named deceleration; the ratio of the rotation swiftness of engine and that of wheels is named the reduction ratio.
Then, exactly why is it necessary to change 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 do not require this kind of a huge force to excersice once they have began to move. Automobile can be cited as a good example. An engine, however, by its character can’t so finely modify its output. As a result, 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 amount of tooth of gears meshing with one another can be deemed as the ratio of the length of levers’ arms. That's, if the decrease ratio is large and the rotation swiftness as output is low in comparison compared to that as input, the energy output by transmission (torque) will be huge; if the rotation swiftness as output isn't so low in comparison compared to that as input, however, the power output by transmission (torque) will be small. Thus, to change the decrease ratio utilizing transmitting is much akin to the principle of moving things.
Then, how does a transmitting modify the reduction ratio ? The answer lies in the mechanism called a planetary Planetary Gear Reduction equipment mechanism.
A planetary gear system is a gear mechanism consisting of 4 components, namely, sun gear A, several world gears B, internal equipment C and carrier D that connects world gears as observed in the graph below. It includes a very complex framework rendering its style or production most challenging; it can realize the high decrease ratio through gears, nevertheless, it really is a mechanism suitable for a reduction system that requires both little 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 decrease to be performed with relatively 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 degrees of torque. The mixture of compact size, huge speed decrease and high torque transmission makes planetary gearboxes a popular choice for space-constrained applications.
But planetary gearboxes perform have some disadvantages. Their complexity in design and manufacturing tends to make them a far more expensive alternative than other gearbox types. And precision production is really important for these gearboxes. If one planetary equipment is positioned closer to the sun gear than the others, imbalances in the planetary gears can occur, leading to premature wear and failure. Also, the compact footprint of planetary gears makes temperature dissipation more difficult, therefore applications that operate at very high speed or experience continuous procedure may require cooling.
When using a “standard” (i.electronic. inline) planetary gearbox, the motor and the driven equipment should be inline with each other, although manufacturers offer right-angle designs that include other gear sets (frequently bevel gears with helical tooth) to provide 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 is dependent on the drive configuration.
2 Max input speed related 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 powerful, precise positioning and repeatability. They were specifically developed for use with state-of-the-art servo motor technology, providing restricted integration of the engine to the unit. Design features include installation any servo motors, standard low backlash, high torsional stiffness, 95 to 97% efficiency and silent running.
They are available in nine sizes with reduction ratios from 3:1 to 600:1 and output torque capacities up to 16,227 lb.ft. The output can be provided with a solid shaft or ISO 9409-1 flange, for installation to rotary or indexing tables, pinion gears, pulleys or other drive elements without the need for a coupling. For high precision applications, backlash amounts right down to 1 arc-minute are available. Right-angle and insight shaft versions of the reducers are also available.
Regular applications for these reducers include precision rotary axis drives, traveling gantries & columns, material handling axis drives and digital line shafting. Industries offered include Material Handling, 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 the majority of accurate and efficient planetaries available. Standard planetary style has three planet gears, with an increased torque edition 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 minute reinforcement. Oversized tapered roller bearings are regular for the ISO Flanged Reducers.
Housing: Single piece metal housing with integral ring gear provides higher concentricity and remove speed fluctuations. The casing can be installed with a ventilation module to increase input speeds and lower operational temps.
Output: Available in a good shaft with optional keyway or an ISO 9409-1 flanged interface. We offer an array of standard pinions to mount 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 cycle forces depend on the powered load, the speed vs. period profile for the routine, and any other external forces acting on the axis.
For application & selection assistance, please call, fax or email us. The application information will be reviewed by our engineers, who'll recommend the very best solution for your application.
Ever-Power Automation’s Gearbox product lines 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 are available in sizes from 40mm to 180mm, perfect for motors ranging from NEMA 17 to NEMA 42 and larger. The Spur Gearbox range 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 so are appropriate for most Servo,
SureGear Planetary Gearboxes for Little Ever-Power Motors
The SureGear PGCN series is a superb gearbox value for servo, stepper, and other motion control applications requiring a NEMA size input/output interface. It includes 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 mounting to SureStep stepper motors
Optional shaft bushings available 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 certainly are a type of cylindrical equipment, with shafts that are parallel and coplanar, and the teeth that are straight and oriented parallel to the shafts. They’re arguably the simplest and most common kind of gear - simple to manufacture and ideal for a range of applications.
One’s the teeth of a spur gear 've 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 approach to tooth meshing causes ruthless on the gear one's teeth and high sound creation. Because of this, spur gears are usually used for lower swiftness applications, although they can be utilized at almost every speed.
An involute tools 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 the involutes fulfill. This aspect actions 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 base circles. Therefore, the gears stick to the essential regulation of gearing, which claims that the ratio of the gears’ angular velocities must stay continuous through the entire mesh.
Spur gears could be produced from metals such as steel or brass, or from plastics such as nylon or polycarbonate. Gears manufactured from plastic produce much less sound, but at the difficulty of power and loading capacity. Unlike other equipment types, spur gears don’t encounter high losses because of slippage, so they often times have high transmission functionality. Multiple spur gears can be utilized 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 possess the 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 teeth that are cut inside surface area of the cylinder. An exterior gear sits in the internal equipment, and the gears 
rotate in the same path. Because the shafts sit closer together, internal equipment assemblies are more compact than external equipment assemblies. Internal gears are mainly used for planetary equipment drives.
Spur gears are usually viewed as best for applications that want speed reduction and torque multiplication, such as for example ball mills and crushing gear. Examples of high- velocity applications that make use of spur gears - despite their high noise amounts - include consumer appliances such as washers and blenders. Even though noise limits the usage of spur gears in passenger automobiles, they are often found in aircraft engines, trains, and even bicycles.
