Planetary Gear Drive
Drive type: speed reducer
Output torque: 33,895 Nm (25,000 lb-ft)
Max input speed: 2800 rpm
Features
Variety 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 option includes the result without external shaft by offering 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 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)
General data
Approximate dry weight215 - 263 kg (475 - 580 lb)4
Radial load (max)28,570 kg (63,000 lb)3
Drive typeSpeed reducer
Hydraulic engine inputSAE C or D
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Planetary Track Drives
High torque and load capacities, to transport equipment over the roughest and steepest terrain.
Designed to allow mounting of plug-in motors.
Integral multi-disc parking brakes, whilst still keeping the drive small.
Steel or high-impact 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 side mechanical seal designed specifically for the earth-moving machines.
Maximum Torque Up to 170,000 Nm
Transmission Ratio Up to 230 iN
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Brevini planetary track drives are made for tracked vehicles and earth-moving machines. They possess a heavy-duty casing, a short overall length, and great radial and axial load capacity.
Our gearboxes are provided with integral multidisc parking brake and have been created for direct mounting of hydraulic plug-in motors. The careful selection of the components and design allows our track drives, CTD and CTU, to be utilized in the most severe environmental working conditions. Brevini planetary track drive units will be 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 wonderful performance characteristics of the PGR/PGW group of gear units make these especially suitable for generating rubber tired or tracked self-propelled vehicles.
These compact planetary track drives are specifically made 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 track 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 machines, which feature a significantly different operating/travel rate ratio.
Note that that is also the proper product for street paving machines, along with construction equipment and forestry machines.
Last drive motors are hydraulic motors with a speed reducing, torque multiplying planetary gear established. In this article, we’ll discuss planetary gear sets, the parts that make them up, and how they work.
Planetary Gears and Last Drive Motors
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Low Quickness, High Torque Motors
Most of the hydraulic motors used for propel motors are low-speed, high-torque (LSHT) motors. Speed and torque are related by power:
Power = Speed x Torque
That means if we want to boost torque for confirmed horsepower, we need to reduce speed:
Torque = Power / Speed
Hence the word "low-speed, high-torque." One way of reducing speed involves the use of planetary gears. They offer speed reduction which results in torque multiplication. Plus they do that all in a compact package in comparison with gear and pinion quickness reducers, and which means they have superb torque density. Below you can observe a planetary gear system from your final drive motor.
Planetary gear set from a final drive displaying the carrier, ring gear, sun equipment, and planetary gears
Carrier for a set of three planetary gears from your final drive
Planetary Gear Systems
In your final drive gear hub, you will most likely have two sets of three planetary gears that rotate about a sun gear. In addition they mesh with a stationary band gear. The upper set of planetary gears are kept together by a carrier, as shown in the image above. As you can see, all three gears are arranged the same distance from each other. At the center is a place for sun gear to mesh and provide input to the machine.
How Final Drive Planetary Gears Work
Let's have a simplified look in how the planetary gears in a final drive work. Input power causes sunlight equipment to rotate at high quickness. The planets mesh with both sun equipment and the ring equipment. They orbit the sun equipment while rolling around the ring gear. The result is low rate, high torque result rotation.
Maintaining the Planetary Gearbox
On your final drive electric motor, the planetary gearbox needs gear oil, also called gear lube. It is essential to check the apparatus oil amounts about every 100 hours and change the gear oil one per year. If you don’t change out your gear oil, you’ll finish up with a heavy sludge that will result in excessive put on of your 
planetary equipment system. Here at Texas Final Drive, we make reference to that as “pudding.”
Another key facet of keeping your planetary gearbox is definitely fixing any leaking seals immediately. If a seal is degraded enough to permit essential oil to leak out, after that that means dirt and dust can make their way in. You do not 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 have the ability to generate the torque you should keep your machine moving. Remember to check and modify the gear essential oil and don’t disregard leaks. And don't forget that pudding and grit are not the thing you need in your gearbox!
The modern and innovative design, the compact construction and the wonderful performance characteristics of the PGR/PGW series of gear units make these especially ideal for driving rubber tired or tracked self-propelled vehicles.
