Planetary Gear Drive
Drive type: speed reducer
Output torque: 33,895 Nm (25,000 lb-ft)
Max input speed: 2800 rpm
Features
Selection of input options
Straight set for an on centerline adaptation providing a symmetrical clearance around the hydraulic motor input
Offset straight in enables the hydraulic electric motor be mounted off center
Right angle input techniques the hydraulic electric motor perpendicular to the centerline of the planetary drive for added clearance between components on track drives
Output options
With external shaft includes keyed, flanged or spline options to meet the various required output connections
An added output choice includes the result without exterior shaft by providing an interior spline at the output
F25R
Planetary Gear Drive
Ratings
Input power (max)71 kW (95 hp)
Input speed (max)2800 rpm2
Output torque (intermittent)33,895 Nm (25,000 lb-ft)
Output torque (continuous)18,710 Nm (13,800 lb-ft)
1 Actual ratio is dependent on the drive configuration.
2 Max input speed related 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 (not available with all ratios)
General data
Approximate dry weight215 – 263 kg (475 – 580 lb)4
Radial load (max)28,570 kg (63,000 lb)3
Drive Planetary Track Drive typeSpeed reducer
Hydraulic motor inputSAE C or D
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Planetary Track Drives
High torque and load capacities, to transport equipment more than the roughest and steepest terrain.
Designed to allow installation of plug-in motors.
Integral multi-disc parking brakes, while still keeping the drive small.
Steel or high-effect spheroidal cast iron structure.
Primary bearings provided for high radial and axial load capacities.
Easy maintenance: filling and draining ports places easy to reach.
Front mechanical seal designed particularly for the earth-moving devices.
Optimum Torque Up to 170,000 Nm
Transmitting Ratio Up to 230 iN
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Brevini planetary monitor drives are created for tracked automobiles and earth-moving machines. They have a heavy-duty casing, a brief overall length, and great radial and axial load capacity.
Our gearboxes are given with integral multidisc parking brake and also have been designed for direct mounting of hydraulic plug-in motors. The careful selection of the components and style allows our track drives, CTD and CTU, to be utilized in the most serious environmental working conditions. Brevini planetary monitor drive units are the perfect answer for crawled undercarriages, drilling, crushing, screening and piling machines.
Planetary Track and Wheel drives
The modern and innovative style, the compact construction and the excellent performance characteristics of the PGR/PGW series of gear units make these especially suitable for traveling rubber tired or tracked self-propelled vehicles.
These compact planetary track drives are specifically designed for tracked vehicles: excavators and earth-moving machines.
They have a heavy-duty casing, a short overall length, and great radial and axial load capacity.
They have an intrinsic multidisc failsafe brake and can be installed directly on hydraulic motors and are ready to accept ‘plug-in’ hydraulic motors.
Characteristics
Type:
planetary
Shaft orientation:
coaxial
Torque:
> 10 kNm
Performance:
high-torque, high load capacity
Other characteristics:
for wheel and monitor drives, small, rugged, for construction vehicles
Description
This gear shaft final drive includes LO-HI speed and was made for increased performance. That is extremely useful specifically in wheeled and tracked devices, which feature a considerably different operating/travel velocity ratio.
Note that that is also the proper product for street paving devices, along with construction apparatus and forestry machines.
Last drive motors are hydraulic motors with a speed reducing, torque multiplying planetary gear set. In this article, we’ll talk about planetary gear sets, the parts that produce them up, and how they function.
Planetary Gears and Final Drive Motors
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Low Rate, High Torque Motors
The majority of the hydraulic motors used for propel motors are low-speed, high-torque (LSHT) motors. Rate and torque are related by power:
Power = Speed x Torque
That means if we want to enhance torque for confirmed horsepower, we have to reduce speed:
Torque = Power / Speed
Hence the word “low-speed, high-torque.” One method of reducing velocity involves the use of planetary gears. They offer speed reduction which outcomes in torque multiplication. And they do this all in a concise package in comparison with gear and pinion rate reducers, and that means they have excellent torque density. Below you can observe a planetary gear program from a final drive motor.
Planetary gear arranged from a final drive showing the carrier, ring equipment, sun equipment, and planetary gears
Carrier for a set of three planetary gears from your final drive
Planetary Gear Systems
In a final drive gear hub, you will usually have two sets of three planetary gears that rotate in regards to a sun gear. They also mesh with a stationary ring gear. The upper set of planetary gears are held together by a carrier, as shown in the picture above. As you can see, all three gears are arranged the same distance from one another. At the guts is a place for sun gear to mesh and provide input to the system.
How Last Drive Planetary Gears Work
Let’s have a simplified look in how the planetary gears in a final drive work. Input power causes sunlight gear to rotate at high speed. The planets mesh with both the sun gear and the ring gear. They orbit the sun equipment while rolling around the band gear. The result is low rate, high torque result rotation.
Maintaining the Planetary Gearbox
On a final drive engine, the planetary gearbox requires equipment oil, also known as equipment lube. It is essential to check the gear oil levels about every 100 hours and change the gear oil once a year. If you don’t change out your gear oil, you’ll finish up with a thicker sludge that will result in excessive wear of your planetary gear system. At Texas Last Drive, we make reference to that as “pudding.”
Another key aspect of maintaining your planetary gearbox can be fixing any leaking seals immediately. If a seal is usually degraded enough to allow essential oil to leak out, after that which means dirt and dust can make their way in. You don’t want to have your gears look like the gritty mess shown below.
final-drive-hydraulic-motor-gear-oil-sludge-2
Conclusion
Your planetary gearbox is a key component of your final drive. If it fails, you won’t be able to generate the torque you have to keep your machine moving. Remember to check and modify the gear oil and don’t ignore leaks. And don’t forget that pudding and grit aren’t what you need in your gearbox!
The present day and innovative style, the compact construction and the excellent performance characteristics of the PGR/PGW series of gear units make these especially ideal for traveling rubber tired or tracked self-propelled vehicles.