Many “gears” are used for automobiles, however they are also used for many other machines. The most typical one is the “transmitting” that conveys the power of engine to tires. There are broadly two functions the transmission of a car plays : one is definitely to decelerate the high rotation swiftness emitted by the engine to transmit to tires; the other is to change the reduction ratio relative to the acceleration / deceleration or traveling speed of a car.
The rotation speed of an automobile’s engine in the general state of driving amounts to at least one 1,000 – 4,000 rotations each and every minute (17 – 67 per second). Since it is extremely hard to rotate tires with the same rotation swiftness to perform, it is required to lower the rotation speed utilizing the ratio of the number of gear teeth. Such a role is named deceleration; the ratio of the rotation quickness of engine and that of tires 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 ? It is because substances need a large force to begin moving however they do not require this kind of a large force to excersice once they have began to move. Automobile can be cited as a good example. An engine, nevertheless, by its nature can’t so finely modify its output. As a result, one adjusts its result by changing the reduction ratio employing a transmission.
The transmission of motive power through gears very much resembles the principle of leverage (a lever). The ratio of the number of tooth of gears meshing with one another can be considered as the ratio of the space of levers’ arms. That’s, if the reduction ratio is huge and the rotation velocity as output is lower in comparison to that as insight, the power output by transmitting (torque) will be large; if the rotation quickness as output isn’t so lower in comparison compared to that as insight, on the other hand, the power output by tranny (torque) will be little. Thus, to improve the decrease ratio utilizing tranny is much akin to the basic principle of moving things.
After that, how does a tranny alter the reduction ratio ? The answer lies in the mechanism called a planetary gear mechanism.
A planetary gear system is a gear system comprising 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 includes a very complex structure rendering its design or production most challenging; it can understand the high decrease ratio through gears, however, it really is a mechanism suited to a reduction mechanism that requires both little size and powerful such as transmission for automobiles.
In a planetary gearbox, many teeth are involved at once, that allows high speed reduction to be performed with fairly small gears and lower inertia reflected back again to the engine. Having multiple teeth discuss the load also allows planetary gears to transmit high degrees 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 style and manufacturing can make them a far more expensive remedy than various other gearbox types. And precision production is extremely 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, resulting in premature wear and failing. Also, the compact footprint of planetary gears makes heat dissipation more difficult, so applications that operate at very high speed or encounter continuous operation 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 provide right-angle designs that integrate other gear sets (frequently bevel gears with helical the teeth) 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 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 (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 electric motor input SAE C or D hydraulic
Precision Planetary Reducers
This standard selection of Precision Planetary Reducers are ideal for use in applications that demand powerful, precise positioning and repeatability. They were specifically developed for make use of with state-of-the-art servo engine technology, providing tight integration of the electric motor to the unit. Style features include mounting any servo motors, regular low backlash, high torsional stiffness, 95 to 97% efficiency and noiseless running.
They are available in nine sizes with reduction 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 components without the 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.
Typical applications for these reducers include precision rotary axis drives, traveling gantries & columns, materials 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 put on, low backlash and low sound, making them the the majority of accurate and efficient planetaries obtainable. Standard planetary design has three world gears, with an increased torque edition using four planets also obtainable, please see the Reducers with Result Flange chart on the machine Ratings tab beneath the “+” unit sizes.
Bearings: Optional output bearing configurations for program particular radial load, axial load and tilting instant reinforcement. Oversized tapered roller bearings are regular for the ISO Flanged Reducers.
Housing: Single piece metal housing with integral ring gear provides better concentricity and eliminate speed fluctuations. The housing can be fitted with a ventilation module to increase insight speeds and lower operational temperature ranges.
Result: Available in a good shaft with optional keyway or an ISO 9409-1 flanged interface. You can expect a wide selection of standard pinions to mount 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 routine forces depend on the driven load, the speed vs. time profile for the cycle, and any other external forces acting on the axis.
For application & selection assistance, please call, fax or email us. The application details will be reviewed by our engineers, who’ll recommend the very best solution for your application.
Ever-Power Automation’s Gearbox products offer high precision in affordable prices! The Planetary Gearbox product offering contains both In-Line and Right-Angle configurations, built with the look goal of supplying a cost-effective gearbox, without sacrificing quality. These Planetary Gearboxes are available in sizes from 40mm to 180mm, well suited for motors ranging from NEMA 17 to NEMA 42 and larger. The Spur Gearbox collection offers 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-pounds (167,808 oz-in), and are compatible with most Servo,
SureGear Planetary Gearboxes for Little Ever-Power Motors
The SureGear PGCN series is an excellent gearbox value for servo, stepper, and other movement control applications requiring a NEMA size input/output interface. It offers 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 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
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 teeth that are straight and oriented parallel to the shafts. They’re arguably the simplest and most common type of gear – simple to manufacture and ideal for an array 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), Planetary Gear Reduction nevertheless the approach to tooth meshing causes ruthless on the gear the teeth and high sound creation. Because of this, spur gears are usually used for lower swiftness applications, although they could be utilized at nearly every speed.
An involute products tooth carries a profile this is actually the involute of a circle, which implies that since two gears mesh, they speak to at an individual point where in fact the involutes fulfill. This aspect actions along the tooth areas as the gears rotate, and the kind of force ( referred to as the line of activities ) is definitely tangent to both bottom circles. Hence, the gears adhere to the fundamental regulation of gearing, which statements that the ratio of the gears’ angular velocities must stay continuous throughout the mesh.
Spur gears could possibly be produced from metals such as for example steel or brass, or from plastics such as nylon or polycarbonate. Gears produced from plastic produce much less audio, but at the trouble of power and loading capacity. Unlike other tools types, spur gears don’t encounter high losses due to slippage, therefore they often times have high transmission overall performance. Multiple spur gears can be utilized in series ( referred to as a equipment teach ) to realize 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 area of the cylinder. Two external gears mesh with one another and rotate in reverse directions. Internal gears, on the other hand, have tooth that are cut inside surface of the cylinder. An external gear sits within the internal equipment, 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 primarily used for planetary equipment drives.
Spur gears are generally seen as best for applications that want speed decrease and torque multiplication, such as ball mills and crushing equipment. Types 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 use of spur gears in passenger automobiles, they are often found in aircraft engines, trains, and even bicycles.