Many “gears” are utilized for automobiles, but they are also utilized for many other machines. The most typical one may be the “tranny” that conveys the energy of engine to tires. There are broadly two functions the planetary gear reduction transmission of an automobile plays : one is definitely to decelerate the high rotation swiftness emitted by the engine to transmit to tires; the various other is to change the reduction ratio relative to the acceleration / deceleration or driving speed of an automobile.
The rotation speed of an automobile’s engine in the overall state of generating amounts to 1 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 speed to run, it is required to lower the rotation speed using the ratio of the amount of gear teeth. This kind of a role is named 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 in accordance with the acceleration / deceleration or driving speed ? It is because substances require a large force to begin 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 an example. An engine, nevertheless, by its nature can’t so finely modify its output. Therefore, one adjusts its result 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 considered as the ratio of the length of levers’ arms. That’s, if the decrease ratio is huge and the rotation acceleration as output is lower in comparison compared to that as input, the energy output by transmission (torque) will be large; if the rotation swiftness as output isn’t so lower in comparison compared to that as insight, however, the power output by transmitting (torque) will be little. Thus, to change the reduction ratio utilizing transmission is much akin to the theory of moving things.
After that, how does a tranny alter the reduction ratio ? The answer lies in the system called a planetary equipment 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 world gears as seen in the graph below. It has a very complex structure rendering its design 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 high performance such as transmission for automobiles.
In a planetary gearbox, many teeth are engaged at once, that allows high speed decrease to be achieved with relatively small gears and lower inertia reflected back again to the electric motor. Having multiple teeth talk about the load also allows planetary gears to transmit high degrees of torque. The mixture of compact size, huge speed reduction and high torque transmitting makes planetary gearboxes a favorite choice for space-constrained applications.
But planetary gearboxes perform involve some disadvantages. Their complexity in design and manufacturing can make them a more expensive alternative than additional gearbox types. And precision manufacturing is extremely important for these gearboxes. If one planetary equipment 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 compact footprint of planetary gears makes high temperature dissipation more difficult, therefore applications that run at very high speed or encounter continuous operation may require cooling.
When utilizing a “standard” (i.electronic. inline) planetary gearbox, the motor and the powered equipment should be inline with each other, although manufacturers offer 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 is dependent on the drive configuration.
2 Max input speed linked to ratio and max result 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 ideal for use in applications that demand powerful, precise positioning and repeatability. These were specifically developed for make use of with state-of-the-art servo electric motor technology, providing limited integration of the electric motor to the unit. Design features include mounting any servo motors, regular low backlash, high torsional stiffness, 95 to 97% efficiency and noiseless running.
They can be purchased 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 mounting to rotary or indexing tables, pinion gears, pulleys or other drive elements with no need for a coupling. For high precision applications, backlash levels right down to 1 arc-minute can be found. 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, material handling axis drives and digital line shafting. Industries offered include Material Managing, Automation, Aerospace, Machine Tool and Robotics.
Unit Design &
Construction
Gearing: Featuring case-hardened & floor gearing with minimal wear, 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 version using four planets also obtainable, please see the Reducers with Result Flange chart on the Unit Ratings tab beneath the “+” unit sizes.
Bearings: Optional result bearing configurations for software particular radial load, axial load and tilting instant reinforcement. Oversized tapered roller bearings are standard for the ISO Flanged Reducers.
Housing: Single piece steel housing with integral band gear provides greater concentricity and eliminate speed fluctuations. The housing can be installed with a ventilation module to improve insight speeds and lower operational temps.
Result: Available in a good shaft with optional keyway or an ISO 9409-1 flanged interface. You can expect an array of standard pinions to mount directly to the output design of your choice.
Unit Selection
These reducers are usually selected predicated on the peak cycle forces, which usually happen during accelerations and decelerations. These cycle forces rely on the powered load, the rate vs. period 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 examined 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 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 larger. The Spur Gearbox line provides 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 so are compatible with most Servo,
SureGear Planetary Gearboxes for Little 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 provides the best quality designed 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
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
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 directly and oriented parallel to the shafts. They’re arguably the easiest and most common kind of gear – simple to manufacture and ideal for a range of applications.
One’s the teeth of a spur gear have got an involute profile and mesh one particular tooth at the same time. The involute type implies that spur gears simply generate radial forces (no axial forces), nevertheless 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 utilized for lower swiftness applications, although they could be utilized at nearly every speed.
An involute products tooth includes a profile this is actually 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 motions 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. Therefore, the gears adhere 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 for example steel or brass, or from plastics such as nylon or polycarbonate. Gears produced from plastic produce much less audio, but at the difficulty of power and loading capacity. Unlike other devices types, spur gears don’t encounter high losses due to slippage, so they often have high transmission performance. Multiple spur gears can be utilized in series ( known 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 of the cylinder. Two exterior gears mesh with one another and rotate in opposing directions. Internal gears, on the other hand, have the teeth that are cut inside surface of the cylinder. An exterior 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 gear assemblies. Internal gears are primarily used for planetary gear drives.
Spur gears are usually viewed as best for applications that require speed reduction and torque multiplication, such as ball mills and crushing gear. Types of high- velocity applications that make use of spur gears – despite their high noise levels – include consumer appliances 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.