Many “gears” are utilized for automobiles, however they are also used for many other machines. The most typical one is the “transmission” that conveys the power of engine to tires. There are broadly two functions the transmission of a car plays : one can be to decelerate the high rotation acceleration emitted by the engine to transmit to tires; the other is to change the reduction ratio in accordance with the acceleration / deceleration or generating speed of a car.
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). Because it is unattainable to rotate tires with the same rotation rate to perform, it is necessary to lower the rotation speed using the ratio of the amount of gear teeth. Such a role is named deceleration; the ratio of the rotation speed of engine and that of wheels is called 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 require a large force to begin moving however they usually do not require such a huge force to excersice once they have started to move. Automobile could be cited as a good example. An engine, nevertheless, by its character can’t so finely alter its output. For that reason, one adjusts its output by changing the decrease 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 the teeth of gears meshing with one another can be deemed as the ratio of the space of levers’ arms. That is, if the decrease ratio is huge and the rotation swiftness as output is lower in comparison compared to that as insight, the energy output by transmitting (torque) will be large; if the rotation acceleration as output isn’t so lower in comparison compared to that as insight, however, the power output by tranny (torque) will be small. Thus, to change the decrease ratio utilizing tranny is much akin to the basic principle of moving things.
After that, how does a transmitting change the reduction ratio ? The answer is based on the system called a planetary gear reduction Planetary equipment mechanism.
A planetary gear system is a gear mechanism consisting of 4 components, namely, sun gear A, several planet gears B, internal gear C and carrier D that connects world gears as seen in the graph below. It includes a very complex structure rendering its style or production most challenging; it can understand the high decrease ratio through gears, nevertheless, it is a mechanism suited to a reduction mechanism that requires both small size and high performance such as for example transmission for automobiles.
In a planetary gearbox, many teeth are involved at once, that allows high speed reduction to be achieved with relatively small gears and lower inertia reflected back again to the engine. Having multiple teeth share the load also allows planetary gears to transmit high levels of torque. The combination of compact size, huge speed decrease and high torque tranny makes planetary gearboxes a popular choice for space-constrained applications.
But planetary gearboxes do have some disadvantages. Their complexity in design and manufacturing tends to make them a far more expensive option than various other gearbox types. And precision manufacturing is really important for these gearboxes. If one planetary equipment is put closer to the sun gear than the others, imbalances in the planetary gears may appear, leading to premature wear and failing. Also, the small footprint of planetary gears makes heat dissipation more difficult, so applications that operate at very high speed or experience continuous procedure may require cooling.
When using a “standard” (i.e. inline) planetary gearbox, the motor and the driven equipment must be inline with one another, although manufacturers provide right-angle designs that incorporate other gear sets (frequently bevel gears with helical the 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 placed 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 motor input SAE C or D hydraulic
Precision Planetary Reducers
This standard selection of Precision Planetary Reducers are perfect for use in applications that demand high performance, precise positioning and repeatability. These were specifically developed for use with state-of-the-art servo engine technology, providing restricted integration of the engine to the unit. Style features include installation any servo motors, standard low backlash, high torsional stiffness, 95 to 97% efficiency and calm 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 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 with no need for a coupling. For high precision applications, backlash amounts right down to 1 arc-minute can be found. Right-angle and input shaft versions of these reducers are also obtainable.
Common applications for these reducers include precision rotary axis drives, traveling gantries & columns, material 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 & surface gearing with minimal use, low backlash and low sound, making them the most accurate and efficient planetaries obtainable. Standard planetary design has three planet gears, with an increased torque version using four planets also offered, please start to see the Reducers with Output Flange chart on the Unit Ratings tab beneath the “+” unit sizes.
Bearings: Optional output bearing configurations for software particular radial load, axial load and tilting minute reinforcement. Oversized tapered roller bearings are standard for the ISO Flanged Reducers.
Housing: Single piece steel housing with integral ring gear provides better concentricity and get rid of speed fluctuations. The casing can be installed with a ventilation module to increase input speeds and lower operational temps.
Output: 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 attach 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 routine forces rely on the powered load, the quickness vs. time profile for the routine, and any other exterior forces functioning 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 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 can be found 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 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 rankings up to 10,488 in-pounds (167,808 oz-in), and are compatible with most Servo,
SureGear Planetary Gearboxes for Small Ever-Power Motors
The SureGear PGCN series is a superb gearbox value for servo, stepper, and other movement 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 installation to SureStep stepper motors
Optional shaft bushings designed for mounting to other motors
1-year warranty
Applications
Material handling
Pick and place
Automation
Packaging
Additional motion control applications requiring a Ever-Power input/output
Spur gears certainly are a type of cylindrical gear, with shafts that are parallel and coplanar, and teeth that are directly and oriented parallel to the shafts. They’re arguably the easiest and most common type of gear – simple to manufacture and suitable for a range of applications.
One’s 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 simply generate radial forces (no axial forces), nevertheless the method of tooth meshing causes high pressure on the gear one’s teeth and high sound creation. For this reason, spur gears are often used for lower swiftness applications, although they could be utilized at almost every speed.
An involute apparatus tooth carries a profile this is the involute of a circle, which means that since two gears mesh, they speak to at an individual point where in fact the involutes satisfy. This aspect actions along the tooth areas as the gears rotate, and the type of force ( referred to as the line of actions ) is certainly tangent to both bottom circles. Therefore, 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 possibly be produced from metals such as for example metallic 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 tools types, spur gears don’t encounter high losses because of slippage, so they often times have high transmission efficiency. Multiple spur gears can be utilized in series ( referred to as a equipment teach ) to achieve 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 of the cylinder. Two exterior gears mesh with one another and rotate in opposite directions. Internal gears, in contrast, have tooth that are cut on the inside surface of the cylinder. An exterior gear sits within 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 equipment assemblies. Internal gears are mainly used for planetary gear drives.
Spur gears are generally seen as best for applications that require speed reduction and torque multiplication, such as for example ball mills and crushing equipment. Types of high- velocity applications that use spur gears – despite their high noise levels – include consumer home appliances such as washers and blenders. Even though noise limits the usage of spur gears in passenger automobiles, they are often used in aircraft engines, trains, and even bicycles.