Many “gears” are used for automobiles, however they are also used for many various other machines. The most frequent one is the “transmitting” that conveys the energy of engine to tires. There are broadly two roles 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 improve the reduction ratio in accordance with 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 impossible to rotate tires with the same rotation acceleration to perform, it is necessary 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 rate of engine and that of tires is called the reduction ratio.
Then, why is it necessary to modify the reduction ratio relative to the acceleration / deceleration or driving speed ? The reason being substances need a large force to start moving however they do not require this kind of a large force to excersice once they have began to move. Automobile could be cited as a good example. An engine, however, by its character can’t so finely alter its output. As a result, one adjusts its output by changing the reduction ratio utilizing 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 each other can be deemed as the ratio of the space of levers’ arms. That is, if the decrease ratio is large and the rotation speed as output is low in comparison to that as input, the power output by tranny (torque) will be huge; if the rotation velocity as output is not so low in comparison to that as input, on the other hand, the energy output by transmission (torque) will be small. Thus, to improve the decrease ratio utilizing tranny is much comparable to the basic principle of moving things.
Then, how does a transmitting modify the reduction ratio ? The answer is based on the mechanism called a planetary gear mechanism.
A planetary gear mechanism is a gear mechanism consisting of 4 components, namely, sun gear A, several planet gears B, internal equipment C and carrier D that connects planet gears as observed in the graph below. It includes a very complex framework rendering its style or production most difficult; it can realize the high decrease ratio through gears, nevertheless, it really is a mechanism suited to a reduction system that requires both little size and powerful such as transmission for automobiles.
In a planetary gearbox, many teeth are involved at once, that allows high speed reduction to be performed with fairly small gears and lower inertia reflected back to the engine. Having multiple teeth discuss the load also enables planetary gears to transmit high levels of torque. The combination of compact size, large speed decrease and high torque transmission 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 answer than various other gearbox types. And precision production is really important for these gearboxes. If one planetary gear is put closer to sunlight gear than the planetary gear reduction others, imbalances in the planetary gears may appear, resulting in premature wear and failing. Also, the small footprint of planetary gears makes warmth dissipation more difficult, therefore applications that operate at high speed or experience continuous operation 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 include 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 would depend on the drive configuration.
2 Max input speed linked to ratio and max output 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. They were specifically developed for use with state-of-the-art servo motor technology, providing restricted integration of the motor to the unit. Style features include installation any servo motors, standard low backlash, high torsional stiffness, 95 to 97% efficiency and silent 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 good shaft or ISO 9409-1 flange, for installation to rotary or indexing tables, pinion gears, pulleys or other drive components 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 the reducers are also offered.
Regular 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 & surface gearing with minimal put on, 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 edition using four planets also offered, please start to see the Reducers with Output Flange chart on the machine Ratings tab under the “+” unit sizes.
Bearings: Optional output bearing configurations for app specific 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 ring gear provides higher concentricity and remove speed fluctuations. The casing can be fitted with a ventilation module to improve input speeds and lower operational temperature ranges.
Output: Available in a solid shaft with optional keyway or an ISO 9409-1 flanged interface. We offer a wide range of standard pinions to attach right to the output style of your choice.
Unit Selection
These reducers are typically selected based on the peak cycle forces, which often happen during accelerations and decelerations. These routine forces depend on the driven load, the quickness vs. time profile for the cycle, and any other external 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 will recommend the best solution for the application.
Ever-Power Automation’s Gearbox products offer high precision in affordable prices! The Planetary Gearbox product offering contains both In-Line and Right-Position 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, well suited for motors ranging from NEMA 17 to NEMA 42 and bigger. The Spur Gearbox range offers an efficient, cost-effective choice appropriate for 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 appropriate for most Servo,
SureGear Planetary Gearboxes for Small Ever-Power Motors
The SureGear PGCN series is a good 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 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 straight and oriented parallel to the shafts. They’re arguably the easiest and most common type of gear – easy to manufacture and suitable for an array of applications.
One’s tooth of a spur gear have got an involute profile and mesh 1 tooth simultaneously. 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. Because of this, spur gears are often used for lower swiftness applications, although they can be utilized at almost every speed.
An involute devices tooth carries a profile this is the involute of a circle, which implies that since two gears mesh, they get in touch with at an individual point where in fact the involutes satisfy. This aspect movements 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 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 throughout the mesh.
Spur gears could possibly be produced from metals such as metal or brass, or from plastics such as for example nylon or polycarbonate. Gears manufactured from plastic produce less sound, but at the trouble of power and loading capability. Unlike other gear types, spur gears don’t encounter high losses because of slippage, therefore they often times have high transmission overall performance. Multiple spur gears can be employed in series ( referred to as a gear teach ) to achieve 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 each other and rotate in opposite directions. Internal gears, in contrast, 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 path. Because the shafts sit closer together, internal gear assemblies are more compact 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 decrease and torque multiplication, such as ball mills and crushing equipment. Types of high- velocity applications that use spur gears – despite their high noise amounts – include consumer home appliances such as washing machines and blenders. And while noise limits the use of spur gears in passenger automobiles, they are generally used in aircraft engines, trains, and even bicycles.