Many “gears” are used for automobiles, but they are also used for many additional machines. The most frequent one may be the “transmission” 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 velocity emitted by the engine to transmit to tires; the other is to change the reduction ratio relative to the acceleration / deceleration or generating speed of a car.
The rotation speed of an automobile’s engine in the general state of driving 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 run, 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 swiftness of engine and that of tires 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 need a large force to start moving however they do not require this kind of a large 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 change its output. Consequently, one adjusts its result 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’s, if the reduction ratio is huge and the rotation rate as output is low in comparison to that as input, the power output by transmission (torque) will be large; if the rotation rate as output isn’t so low in comparison to that as insight, on the other hand, the power output by transmission (torque) will be little. Thus, to change the decrease ratio utilizing transmitting is much akin to the principle of moving things.
After that, how does a tranny change the reduction ratio ? The answer is based on the system called a planetary gear mechanism.
A planetary gear mechanism is a gear mechanism consisting of 4 components, namely, sunlight 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 design or production most challenging; it can understand the high reduction ratio through gears, however, it really is a mechanism suitable for a reduction system 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 reduction to be achieved with fairly small gears and lower inertia reflected back again to the motor. Having multiple teeth reveal the load also allows planetary gears to transmit high degrees of torque. The combination of compact size, huge 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 far more expensive option than additional gearbox types. And precision manufacturing is extremely important for these gearboxes. If one planetary gear is put closer to the sun gear compared to the others, imbalances in the planetary gears may appear, resulting in premature wear and failing. Also, the small footprint of planetary gears makes temperature dissipation more difficult, so applications that operate at high speed or planetary gear reduction encounter continuous procedure may require cooling.
When utilizing a “standard” (i.electronic. inline) planetary gearbox, the motor and the powered equipment must be inline with one another, although manufacturers provide right-angle designs that include other gear sets (often bevel gears with helical the teeth) to provide an offset between the 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 would depend on the drive configuration.
2 Max input speed related 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 electric motor input SAE C or D hydraulic
Precision Planetary Reducers
This standard selection 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 motor technology, providing restricted integration of the motor to the unit. Design features include mounting any servo motors, standard 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 can be provided with a good shaft or ISO 9409-1 flange, for mounting 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 are available. Right-angle and input shaft versions of these reducers are also offered.
Usual applications for these reducers include precision rotary axis drives, traveling gantries & columns, materials 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 & floor gearing with minimal use, low backlash and low noise, making them the the majority of accurate and efficient planetaries obtainable. Standard planetary style has three world gears, with an increased torque edition using four planets also available, please start to see the Reducers with Output 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 minute 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 remove speed fluctuations. The casing can be fitted with a ventilation module to increase input speeds and lower operational temperature ranges.
Result: Available in a good shaft with optional keyway or an ISO 9409-1 flanged interface. You can expect a wide selection of standard pinions to mount right to the output design of your choice.
Unit Selection
These reducers are usually selected based on the peak cycle forces, which usually happen during accelerations and decelerations. These routine forces depend on the driven load, the rate vs. time profile for the cycle, and any other exterior forces acting 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 product lines offer high precision at affordable prices! The Planetary Gearbox product offering contains both In-Line and Right-Position configurations, built with the design 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 larger. The Spur Gearbox series 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 are compatible with most Servo,
SureGear Planetary Gearboxes for Little 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 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
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 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 ideal for an array of applications.
One’s the teeth of a spur gear have got an involute profile and mesh a single tooth at the same time. The involute type means that spur gears just generate radial forces (no axial forces), however the approach to tooth meshing causes ruthless 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 equipment tooth includes a profile this is actually 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 activities ) is tangent to both bottom circles. Hence, the gears stick to the fundamental regulation of gearing, which claims that the ratio of the gears’ angular velocities must stay continuous throughout the mesh.
Spur gears could be produced from metals such as for example metallic or brass, or from plastics such as nylon or polycarbonate. Gears manufactured from plastic produce 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, so they often times have high transmission functionality. 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 one’s teeth that are cut externally surface of the cylinder. Two external gears mesh with each other and rotate in opposite directions. Internal gears, in contrast, have tooth 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 are positioned closer together, internal equipment assemblies are more compact than external gear assemblies. Internal gears are primarily used for planetary equipment drives.
Spur gears are usually viewed 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 use spur gears – despite their high noise levels – include consumer devices such as washers and blenders. And while noise limits the utilization of spur gears in passenger automobiles, they are often found in aircraft engines, trains, and even bicycles.