Many “gears” are used for automobiles, but they are also utilized for many additional machines. The most frequent one is the “transmission” that conveys the energy of engine to tires. There are broadly two functions the transmission of an automobile plays : one is definitely to decelerate the high rotation quickness emitted by the engine to transmit to tires; the other is to improve the reduction ratio in accordance with 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 1 1,000 – 4,000 rotations per minute (17 – 67 per second). Since it is extremely hard to rotate tires with the same rotation velocity to run, it is required to lower the rotation speed utilizing the ratio of the number of gear teeth. This kind of a role is called deceleration; the ratio of the rotation quickness of engine and that of wheels is named the reduction ratio.
Then, why is it necessary to alter the reduction ratio relative to the acceleration / deceleration or driving speed ? This is because substances require 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, nevertheless, by its nature can’t so Planetary Gear Reduction finely modify its output. Therefore, one adjusts its output by changing the decrease ratio utilizing 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 deemed as the ratio of the distance of levers’ arms. That’s, if the reduction ratio is huge and the rotation velocity as output is lower in comparison compared to that as insight, the energy output by transmission (torque) will be huge; if the rotation velocity as output isn’t so low in comparison compared to that as insight, on the other hand, the power output by transmission (torque) will be little. Thus, to improve the decrease ratio utilizing transmitting is much comparable to the theory of moving things.
Then, how does a tranny change the reduction ratio ? The answer is based on the mechanism called a planetary equipment mechanism.
A planetary gear system is a gear system 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 structure rendering its style or production most challenging; it can recognize the high reduction ratio through gears, nevertheless, it really is a mechanism suitable for a reduction mechanism 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 fairly small gears and lower inertia reflected back to the electric motor. Having multiple teeth reveal the load also enables planetary gears to transmit high degrees of torque. The mixture of compact size, large speed decrease and high torque transmission makes planetary gearboxes a popular choice for space-constrained applications.
But planetary gearboxes do involve some disadvantages. Their complexity in style and manufacturing can make them a more expensive answer than additional gearbox types. And precision production is really important for these gearboxes. If one planetary gear is positioned closer to sunlight gear than the others, imbalances in the planetary gears may appear, leading to premature wear and failure. Also, the small footprint of planetary gears makes heat dissipation more difficult, so applications that run at very high speed or encounter continuous procedure may require cooling.
When utilizing a “standard” (i.e. inline) planetary gearbox, the motor and the powered equipment should be inline with one another, 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 is dependent 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 (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 make use of with state-of-the-art servo engine technology, providing tight integration of the engine to the unit. Style features include mounting any servo motors, regular 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 output torque capacities up to 16,227 lb.ft. The output could 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 down to 1 arc-minute can be found. Right-angle and input shaft versions of these reducers are also obtainable.
Usual 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 use, low backlash and low noise, making them the the majority of accurate and efficient planetaries available. Standard planetary design has three world gears, with an increased torque edition using four planets also available, please see the Reducers with Output Flange chart on the Unit Ratings tab under the “+” unit sizes.
Bearings: Optional result bearing configurations for app specific radial load, axial load and tilting second reinforcement. Oversized tapered roller bearings are regular for the ISO Flanged Reducers.
Housing: Single piece metal housing with integral ring gear provides greater concentricity and get rid of speed fluctuations. The housing can be installed with a ventilation module to improve insight speeds and lower operational temps.
Output: Available in a solid shaft with optional keyway or an ISO 9409-1 flanged interface. You can expect 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 often happen during accelerations and decelerations. These routine forces depend on the powered load, the swiftness vs. time profile for the routine, and any other external forces functioning on the axis.
For application & selection assistance, please call, fax or email us. Your application info will be reviewed by our engineers, who will recommend the best solution for the application.
Ever-Power Automation’s Gearbox product lines offer high precision in affordable prices! The Planetary Gearbox product offering contains both In-Line and Right-Position 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, perfect for motors which range from NEMA 17 to NEMA 42 and bigger. The Spur Gearbox series offers an efficient, cost-effective option appropriate for Ever-Power Automation’s AC Induction Gear Motors. Ever-Power Automation’s Gearboxes can be found in up to 30 different gear ratios, with torque rankings up to 10,488 in-pounds (167,808 oz-in), and are appropriate for most Servo,
SureGear Planetary Gearboxes for Small Ever-Power Motors
The SureGear PGCN series is an excellent 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 range 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 are a type of cylindrical equipment, with shafts that are parallel and coplanar, and tooth that are straight and oriented parallel to the shafts. They’re arguably the simplest and most common kind of gear – easy to manufacture and ideal for a range of applications.
One’s tooth of a spur gear have got an involute profile and mesh a single tooth simultaneously. The involute type implies that spur gears simply 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 could be utilized at nearly every speed.
An involute tools tooth includes a profile this is the involute of a circle, which means that since two gears mesh, they get in touch with at an individual point where in fact the involutes fulfill. This aspect motions along the tooth areas as the gears rotate, and the type of force ( known as the line of activities ) is tangent to both bottom circles. Hence, the gears adhere 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 metal or brass, or from plastics such as nylon or polycarbonate. Gears manufactured from plastic produce much less audio, but at the trouble of power and loading capacity. Unlike other gear types, spur gears don’t encounter high losses due to slippage, therefore they often times have high transmission efficiency. Multiple spur gears can be employed in series ( known as a gear teach ) to realize 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 opposing directions. Internal gears, on the other hand, have teeth that are cut inside surface of the cylinder. An exterior gear sits in the internal equipment, 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 mainly used for planetary equipment drives.
Spur gears are usually seen 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 home appliances such as washing machines and blenders. Even though noise limits the use of spur gears in passenger automobiles, they are generally found in aircraft engines, trains, and even bicycles.