Many “gears” are used for automobiles, but they are also used for many various other machines. The most frequent one may be the “tranny” that conveys the energy of engine to tires. There are broadly two functions the transmission of a car plays : one is to decelerate the high rotation speed emitted by the engine to transmit to tires; the various other is to change the reduction ratio relative to the acceleration / deceleration or traveling 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 difficult to rotate tires with the same rotation rate to perform, it is necessary to lessen the rotation speed using the ratio of the number of gear teeth. This kind of a role is named deceleration; the ratio of the rotation speed of engine and that of wheels is called the reduction ratio.
Then, exactly 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 huge force to keep moving once they have began to move. Automobile can be cited as a good example. An engine, nevertheless, by its character can’t so finely change its output. As a result, one adjusts its output by changing the decrease ratio utilizing a transmission.
The transmission of motive power through gears quite definitely resembles the principle of leverage (a lever). The ratio of the number of tooth of gears meshing with each other can be considered as the ratio of the space of levers’ arms. That’s, if the decrease ratio is large and the rotation rate as output is low in comparison to that as input, the energy output by transmission (torque) will be large; if the rotation swiftness as output is not so lower in comparison to that as input, on the other hand, the power output by transmitting (torque) will be small. Thus, to improve the decrease ratio utilizing transmission is much akin to the basic principle of moving things.
Then, how does a transmission modify the reduction ratio ? The answer is based on the mechanism called a planetary gear mechanism.
A planetary gear system is a gear system consisting of 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 includes a very complex structure rendering its style or production most difficult; it can understand the high reduction ratio through gears, nevertheless, it is a mechanism suitable for a reduction mechanism that requires both little size and powerful such as for example transmission for automobiles.
In a planetary gearbox, many teeth are involved at once, which allows high speed decrease to be performed with fairly small gears and lower inertia reflected back again to the engine. Having multiple teeth share the load also enables planetary gears to transmit high degrees of torque. The combination of compact size, huge speed decrease and high torque transmission makes planetary gearboxes a favorite choice for space-constrained applications.
But planetary gearboxes perform have some disadvantages. Their complexity in design and manufacturing tends to make them a far more expensive answer than additional gearbox types. And precision manufacturing is really important for these gearboxes. If one planetary gear is positioned closer to sunlight gear than the others, imbalances in the planetary gears can occur, leading to premature wear and failing. Also, the compact footprint of planetary gears makes high temperature dissipation more difficult, therefore applications that operate at very high speed or encounter continuous procedure may require cooling.
When using 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 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 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 (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 range of Precision Planetary Reducers are perfect for use in applications that demand powerful, precise positioning and repeatability. These were specifically developed for use with state-of-the-art servo electric motor technology, providing restricted integration of the motor to the unit. Design features include mounting any servo motors, regular low backlash, high torsional stiffness, 95 to 97% efficiency and calm 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 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 down to 1 arc-minute are available. Right-angle and input shaft versions of the reducers are also offered.
Regular 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 & floor gearing with minimal wear, low backlash and low sound, making them the the majority of accurate and efficient planetaries offered. Standard planetary style has three world gears, with an increased torque version using four planets also offered, please see the Reducers with Result Flange chart on the machine Ratings tab beneath the “+” unit sizes.
Bearings: Optional output bearing configurations for app particular radial load, axial load and tilting minute reinforcement. Oversized tapered roller bearings are standard for the ISO Flanged Reducers.
Housing: Single piece metal housing with integral band gear provides higher concentricity and eliminate speed fluctuations. The casing can be fitted with a ventilation module to increase insight 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 design of your choice.
Unit Selection
These reducers are typically selected predicated on the peak cycle forces, which usually happen during accelerations and decelerations. These routine forces depend on the driven load, the velocity vs. period profile for the routine, and any other exterior forces acting 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 best solution for your application.
Ever-Power Automation’s Gearbox products 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 offering a cost-effective gearbox, without sacrificing quality. These Planetary Gearboxes are available in sizes from 40mm to 180mm, ideal for motors ranging from NEMA 17 to NEMA 42 and bigger. The Spur Gearbox range 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 equipment ratios, with torque ratings up to 10,488 in-lbs (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 good 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 available 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 the teeth that are directly and oriented parallel to the shafts. They’re arguably the simplest and most common kind of gear – simple to manufacture and suitable for a range of applications.
One’s teeth of a spur gear ‘ve 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 one’s teeth and high noise creation. Because of this, spur gears are usually used for lower swiftness applications, although they could be utilized at almost every speed.
An involute gear tooth carries a profile this is the involute of a circle, which means that since two gears mesh, they get in touch with at a person point where in fact the involutes fulfill. This Planetary Gear Reduction aspect movements along the tooth areas as the gears rotate, and the kind of force ( known as the line of activities ) is definitely tangent to both base circles. Hence, the gears stick to the fundamental 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 for example steel or brass, or from plastics such as for example nylon or polycarbonate. Gears produced from plastic produce less sound, but at the trouble of power and loading capacity. Unlike other devices types, spur gears don’t encounter high losses because of slippage, therefore they often times have high transmission performance. Multiple spur gears can be utilized in series ( referred to as a gear teach ) to attain large reduction ratios.
There are two primary types of spur gears: external and internal. Exterior gears possess one’s teeth that are cut externally surface area of the cylinder. Two external gears mesh with one another and rotate in opposing directions. Internal gears, in contrast, have tooth that are cut 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 gear assemblies are more compact than external gear assemblies. Internal gears are mainly used for planetary gear drives.
Spur gears are usually seen as best for applications that want speed decrease and torque multiplication, such as for example ball mills and crushing equipment. Examples of high- velocity applications that make use of spur gears – despite their high noise amounts – include consumer devices such as washers and blenders. And while noise limits the usage of spur gears in passenger automobiles, they are generally found in aircraft engines, trains, and even bicycles.