Many “gears” are utilized for automobiles, but they are also utilized for many additional machines. The most frequent one may be the “transmission” that conveys the power of engine to tires. There are broadly two roles the transmission of a car plays : one is usually to decelerate the high rotation velocity emitted by the engine to transmit to tires; the additional is to improve 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 driving amounts to at least one 1,000 – 4,000 rotations per minute (17 – 67 per second). Since it is unattainable to rotate tires with the same rotation rate to perform, 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 called the reduction ratio.
Then, exactly why is it necessary to alter the reduction ratio relative to the acceleration / deceleration or driving speed ? This is because substances need a large force to begin moving however they do not require this kind of a big force to excersice once they have began 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 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 deemed as the ratio of the length of levers’ arms. That’s, if the decrease ratio is large and the rotation velocity as output is low in comparison compared to that as insight, the energy output by tranny (torque) will be huge; if the rotation rate as output isn’t so lower in comparison to that as insight, however, the energy output by tranny (torque) will be little. Thus, to improve the decrease ratio utilizing tranny is much akin to the principle of moving things.
After that, how does a tranny alter the reduction ratio ? The answer is based on the system called a planetary equipment mechanism.
A planetary gear mechanism 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 recognize the high decrease ratio through gears, nevertheless, it really is a mechanism suitable for 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, large speed reduction and high torque transmitting makes planetary gearboxes a popular choice for space-constrained applications.
But planetary gearboxes do involve some disadvantages. Their complexity in design and manufacturing tends to make them a far more expensive alternative 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 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 high temperature dissipation more difficult, so applications that operate at very high speed or experience continuous operation may require cooling.
When utilizing a “standard” (i.e. inline) planetary gearbox, the motor and the driven equipment should be inline with each other, although manufacturers offer right-angle designs that incorporate other gear sets (often bevel gears with helical the teeth) to supply 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 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 selection of Precision Planetary Reducers are perfect for use in applications that demand high performance, 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. 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 decrease ratios from 3:1 to 600:1 and output torque capacities up to 16,227 lb.ft. The output could be provided with a good 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 are available. Right-angle and input shaft versions of the reducers are also offered.
Standard 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 & floor gearing with minimal wear, low backlash and low sound, making them the most 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 second 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 eliminate speed fluctuations. The housing can be fitted with a ventilation module to improve input speeds and lower operational temperature ranges.
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 mount directly to the output design of your choice.
Unit Selection
These reducers are typically selected based on the peak cycle forces, which usually happen during accelerations and decelerations. These routine forces depend on the powered load, the rate vs. planetary gear reduction period profile for the routine, and any other exterior 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 in affordable prices! The Planetary Gearbox item offering includes both In-Line and Right-Position configurations, built with the look goal of offering 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 bigger. The Spur Gearbox range provides an efficient, cost-effective option 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 so are appropriate for 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 available 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
Additional motion control applications requiring a Ever-Power input/output
Spur gears certainly are a type of cylindrical equipment, with shafts that are parallel and coplanar, and the teeth 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 teeth of a spur gear ‘ve got an involute profile and mesh one particular tooth simultaneously. The involute type implies that spur gears just generate radial forces (no axial forces), nevertheless the approach to tooth meshing causes ruthless on the gear the teeth and high sound creation. Because of this, spur gears are often utilized for lower swiftness applications, although they could be utilized at almost every speed.
An involute apparatus 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 in fact the involutes fulfill. This aspect motions along the tooth areas as the gears rotate, and the type of force ( referred to as the line of activities ) can be tangent to both base circles. Hence, the gears stick 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 metallic or brass, or from plastics such as nylon or polycarbonate. Gears produced from plastic produce less audio, but at the difficulty of power and loading capability. Unlike other tools types, spur gears don’t encounter high losses due to slippage, therefore they often times have high transmission efficiency. 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 one’s teeth that are cut externally surface of the cylinder. Two exterior gears mesh with each other and rotate in opposing directions. Internal gears, on the other hand, have tooth that are cut on the inside surface area of the cylinder. An external gear sits within 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 usually 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 devices such as washers and blenders. And while noise limits the use of spur gears in passenger automobiles, they are often found in aircraft engines, trains, and even bicycles.