Many “gears” are used for automobiles, however they are also utilized for many 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 speed emitted by the engine to transmit to tires; the additional is to change the reduction ratio relative to the acceleration / deceleration or driving speed of a car.
The rotation speed of an automobile’s engine in the general state of traveling amounts to at least one 1,000 – 4,000 rotations each and every minute (17 – 67 per second). Since it is extremely hard to rotate tires with the same rotation rate to perform, it is necessary to lessen 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 wheels is named the reduction ratio.
Then, why is it necessary to modify the reduction ratio in accordance with the acceleration / deceleration or driving speed ? It is because substances need a large force to begin moving however they do not require such a sizable force to keep moving once they have started to move. Automobile can be cited as a good example. An engine, however, by its nature can’t so finely alter its output. Therefore, one adjusts its result by changing the decrease ratio utilizing a transmission.
The transmission of motive power through gears very much resembles the principle of leverage (a lever). The ratio of the amount of teeth of gears meshing with each other can be considered as the ratio of the space of levers’ arms. That is, if the reduction ratio is huge and the rotation quickness as output is low in comparison compared to that as insight, the power output by transmitting (torque) will be large; if the rotation quickness as output is not so lower in comparison to that as input, on the other hand, the energy output by tranny (torque) will be little. Thus, to change the decrease ratio utilizing transmitting is much comparable to the basic principle of moving things.
Then, how does a tranny alter the reduction ratio ? The answer is based on the system called a planetary gear mechanism.
A planetary gear mechanism is a gear system comprising 4 components, namely, sunlight gear A, several world gears B, internal equipment C and carrier D that connects planet gears as observed in the graph below. It includes a very complex structure rendering its design or production most difficult; it can understand the high reduction ratio through gears, however, it really is a mechanism suitable for a reduction mechanism that requires both small size and powerful such as transmission for automobiles.
In a planetary gearbox, many teeth are involved at once, which allows high speed decrease to be achieved with fairly small gears and lower inertia reflected back again to the engine. Having multiple teeth discuss the load also enables planetary gears to transmit high degrees of torque. The combination of compact size, huge speed decrease and high torque tranny makes planetary gearboxes a favorite choice for space-constrained applications.
But planetary gearboxes do have some disadvantages. Their complexity in style and manufacturing can make them a more expensive option than other gearbox types. And precision production is extremely important for these gearboxes. If one planetary equipment is put closer to sunlight gear compared to the others, imbalances in the planetary gears can occur, resulting in premature wear and failing. Also, the compact footprint of planetary gears makes high temperature dissipation more difficult, so applications that run at very high speed or experience continuous procedure may require cooling.
When utilizing a “standard” (i.e. inline) planetary gearbox, the motor and the driven equipment must be inline with one another, although manufacturers offer right-angle designs that integrate 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 Planetary Gear Reduction dependent on the drive configuration.
2 Max input speed related 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 ideal for use in applications that demand high performance, precise positioning and repeatability. These were specifically developed for use with state-of-the-art servo electric motor technology, providing limited integration of the electric motor to the unit. Style features include installation any servo motors, regular low backlash, high torsional stiffness, 95 to 97% efficiency and quiet running.
They can be purchased in nine sizes with reduction 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 mounting to rotary or indexing tables, pinion gears, pulleys or other drive components with no need for a coupling. For high precision applications, backlash amounts down to 1 arc-minute can be found. Right-angle and insight shaft versions of the reducers are also obtainable.
Usual applications for these reducers include precision rotary axis drives, traveling gantries & columns, material 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 & surface gearing with minimal put on, low backlash and low sound, making them the most accurate and efficient planetaries offered. Standard planetary style has three world gears, with a higher torque edition using four planets also obtainable, please start to see the Reducers with Output Flange chart on the Unit Ratings tab under the “+” unit sizes.
Bearings: Optional result bearing configurations for program particular radial load, axial load and tilting instant 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 installed with a ventilation module to increase insight speeds and lower operational temps.
Output: Available in a good shaft with optional keyway or an ISO 9409-1 flanged interface. We offer a wide range of standard pinions to mount 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 driven load, the speed vs. time profile for the routine, and any other external forces functioning on the axis.
For application & selection assistance, please call, fax or email us. The application information will be examined by our engineers, who will recommend the best solution for the application.
Ever-Power Automation’s Gearbox product lines offer high precision at affordable prices! The Planetary Gearbox item 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 are available in sizes from 40mm to 180mm, perfect for motors which range from NEMA 17 to NEMA 42 and larger. The Spur Gearbox series 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 compatible with most Servo,
SureGear Planetary Gearboxes for Little Ever-Power Motors
The SureGear PGCN series is a great 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 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 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 gear, with shafts that are parallel and coplanar, and the 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 a range of applications.
One’s tooth of a spur gear have got an involute profile and mesh 1 tooth at the same time. The involute type implies 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. For this reason, spur gears are usually used for lower swiftness applications, although they can be utilized at nearly every speed.
An involute devices tooth includes a profile this is actually the involute of a circle, which means that since two gears mesh, they get in touch with at an individual point where the involutes meet. This aspect motions along the tooth areas as the gears rotate, and the kind of force ( known as the line of actions ) is definitely tangent to both bottom circles. Therefore, the gears stick to the essential regulation of gearing, which promises that the ratio of the gears’ angular velocities must stay continuous throughout the mesh.
Spur gears could possibly 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 capability. Unlike other products types, spur gears don’t encounter high losses due to slippage, so they often times have high transmission functionality. Multiple spur gears can be employed in series ( referred to as a gear 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 external gears mesh with each other and rotate in opposing directions. Internal gears, on the other hand, have tooth that are cut inside surface area of the cylinder. An external gear sits in the internal equipment, and the gears rotate in the same direction. Because the shafts are positioned closer together, internal gear assemblies are smaller sized than external gear assemblies. Internal gears are primarily used for planetary equipment drives.
Spur gears are usually seen as best for applications that require speed decrease and torque multiplication, such as ball mills and crushing equipment. Examples of high- velocity applications that make use of spur gears – despite their high noise levels – include consumer devices such as washers and blenders. Even though noise limits the utilization of spur gears in passenger automobiles, they are generally found in aircraft engines, trains, and even bicycles.