Many “gears” are utilized for automobiles, but they are also used for many additional machines. The most typical one may be the “transmitting” that conveys the power of engine to tires. There are broadly two roles the transmission of a car plays : one is to decelerate the high rotation speed emitted by the engine to transmit to tires; the additional 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 generating amounts to at least one 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 lessen the rotation speed utilizing the ratio of the amount of gear teeth. Such a role is called deceleration; the ratio of the rotation acceleration 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 ? The reason being substances need a large force to begin moving however they do not require such a big force to excersice once they have started to move. Automobile could be cited as an example. An engine, nevertheless, by its character can’t so finely alter its output. Therefore, one adjusts its output by changing the decrease ratio employing a transmission.
The transmission of motive power planetary gear reduction through gears quite definitely resembles the principle of leverage (a lever). The ratio of the amount of tooth of gears meshing with each other can be considered as the ratio of the distance of levers’ arms. That’s, if the decrease ratio is large and the rotation velocity as output is lower in comparison compared to that as insight, the energy output by tranny (torque) will be huge; if the rotation velocity as output is not so lower in comparison compared to that as input, on the other hand, the energy output by tranny (torque) will be little. Thus, to change 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 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 planet gears B, internal equipment C and carrier D that connects planet gears as seen in the graph below. It includes a very complex structure rendering its style or production most difficult; it can understand the high decrease ratio through gears, nevertheless, it really is a mechanism suited to 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 reduction to be achieved with fairly small gears and lower inertia reflected back again to the motor. Having multiple teeth share the load also allows planetary gears to transmit high degrees of torque. The combination of compact size, huge speed reduction and high torque transmitting makes planetary gearboxes a favorite choice for space-constrained applications.
But planetary gearboxes do involve some disadvantages. Their complexity in design and manufacturing can make them a far more expensive alternative than various other gearbox types. And precision production is really important for these gearboxes. If one planetary gear is put closer to the sun gear compared to the others, imbalances in the planetary gears can occur, resulting in premature wear and failing. Also, the small footprint of planetary gears makes temperature dissipation more difficult, so applications that operate at very high speed or experience continuous procedure may require cooling.
When utilizing a “standard” (i.e. inline) planetary gearbox, the motor and the powered equipment should be inline with each other, although manufacturers offer right-angle designs that integrate other gear sets (frequently bevel gears with helical tooth) 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 engine input SAE C or D hydraulic
Precision Planetary Reducers
This standard selection of Precision Planetary Reducers are perfect 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 motor technology, providing tight integration of the engine to the unit. Style features include mounting any servo motors, standard low backlash, high torsional stiffness, 95 to 97% efficiency and peaceful running.
They can be purchased in nine sizes with decrease 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 installation to rotary or indexing tables, pinion gears, pulleys or other drive components with no need for a coupling. For high precision applications, backlash levels right down to 1 arc-minute can be found. Right-angle and input shaft versions of the reducers are also obtainable.
Standard applications for these reducers include precision rotary axis drives, traveling gantries & columns, materials handling axis drives and electronic line shafting. Industries served include Material Handling, Automation, Aerospace, Machine Tool and Robotics.
Unit Design &
Construction
Gearing: Featuring case-hardened & ground gearing with minimal use, low backlash and low sound, making them the many accurate and efficient planetaries obtainable. Standard planetary style has three world gears, with a higher torque version using four planets also available, please see the Reducers with Result Flange chart on the machine Ratings tab beneath the “+” unit sizes.
Bearings: Optional output bearing configurations for application specific 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 higher concentricity and remove speed fluctuations. The housing can be installed with a ventilation module to improve input speeds and lower operational temps.
Result: Available in a solid shaft with optional keyway or an ISO 9409-1 flanged interface. You can expect a wide range of standard pinions to install right to the output style of your choice.
Unit Selection
These reducers are usually selected based on the peak cycle forces, which usually happen during accelerations and decelerations. These cycle forces depend on the powered load, the velocity 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 information will be examined by our engineers, who will recommend the very best solution for your application.
Ever-Power Automation’s Gearbox product lines offer high precision in affordable prices! The Planetary Gearbox item offering includes both In-Line and Right-Position 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, ideal for motors ranging from NEMA 17 to NEMA 42 and larger. The Spur Gearbox collection provides an efficient, cost-effective choice compatible with Ever-Power Automation’s AC Induction Gear Motors. Ever-Power Automation’s Gearboxes are offered in up to 30 different equipment ratios, with torque ratings up to 10,488 in-lbs (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 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
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 easiest and most common type of gear – easy 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 means that spur gears just generate radial forces (no axial forces), nevertheless the approach to tooth meshing causes high pressure on the gear the teeth and high sound creation. For this reason, spur gears are often utilized for lower swiftness applications, although they could be utilized at almost every speed.
An involute devices tooth includes 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 movements along the tooth areas as the gears rotate, and the kind of force ( known as the line of activities ) can be tangent to both base circles. Hence, the gears adhere to the essential regulation of gearing, which statements 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 for example nylon or polycarbonate. Gears produced from plastic produce much less sound, but at the trouble of power and loading capability. Unlike other tools types, spur gears don’t encounter high losses due to slippage, so 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 one’s teeth that are cut externally surface area of the cylinder. Two exterior gears mesh with one another and rotate in reverse directions. Internal gears, on the other hand, have tooth that are cut on the inside surface area of the cylinder. An external gear sits inside the internal equipment, and the gears rotate in the same direction. Because the shafts sit closer together, internal gear assemblies are smaller sized than external equipment assemblies. Internal gears are mainly used for planetary equipment drives.
Spur gears are generally 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 use spur gears – despite their high noise levels – include consumer home appliances such as washers and blenders. And while noise limits the usage of spur gears in passenger automobiles, they are often found in aircraft engines, trains, and even bicycles.