Planetary Gear Drive
Drive type: speed reducer
Result torque: 33,895 Nm (25,000 lb-ft)
Max input speed: 2800 rpm
Features
Selection of input options
Straight set for an upon centerline adaptation giving a symmetrical clearance about the hydraulic motor input
Offset straight in allows the hydraulic motor be mounted off center
Right angle input movements the hydraulic motor perpendicular to the centerline of the planetary drive for added clearance between parts on track drives
Output options
With external shaft includes keyed, flanged or spline options to meet up the various required output connections
An added output choice includes the output without exterior shaft by providing an internal 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 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, whilst still keeping the drive compact.
Steel or high-effect spheroidal cast iron framework.
Primary bearings provided for high radial and axial load capacities.
Easy maintenance: filling and draining ports locations easy to reach.
Front side mechanical seal designed particularly for the earth-moving devices.
Optimum Torque Up to 170,000 Nm
Transmission Ratio Up to 230 iN
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Brevini planetary monitor drives are designed for tracked automobiles and earth-moving machines. They have a heavy-duty casing, a brief overall duration, and great radial and axial load capacity.
Our gearboxes are given with essential multidisc parking brake and have been designed for direct installation of hydraulic plug-in motors. The careful choice of the components and style allows our track drives, CTD and CTU, to be used in the most severe environmental working circumstances. Brevini planetary track drive units will be the perfect remedy for crawled undercarriages, drilling, crushing, screening and piling devices.
Planetary Track and Wheel drives
The present day and innovative style, the compact construction and the wonderful performance characteristics of the PGR/PGW series of gear units make these especially ideal 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 integral multidisc failsafe brake and may be installed 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, compact, rugged, for construction vehicles
Description
This gear shaft final drive includes LO-HI speed and was made for increased performance. The item is extremely useful especially in wheeled and tracked machines, which feature a significantly different operating/travel acceleration ratio.
Note that that is also the proper product for road paving machines, along with construction equipment and forestry machines.
Last drive motors are hydraulic motors with a speed reducing, torque multiplying planetary gear set. In this article, we’ll discuss planetary gear sets, the parts that make them up, and how they function.
Planetary Gears and 
Last Drive Motors
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Low Rate, High Torque Motors
Most of the hydraulic motors used for propel motors are low-speed, high-torque (LSHT) motors. Quickness and torque are related by power:
Power = Speed x Torque
That means if we want to increase torque for confirmed horsepower, we need to reduce speed:
Torque = Power / Speed
Hence the term “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 velocity reducers, and which means they have excellent torque density. Below you can see a planetary gear system from a final drive motor.
Planetary gear established from a final drive showing the carrier, ring equipment, sun gear, and planetary gears
Carrier for a couple of 3 planetary gears from your final drive
Planetary Gear Systems
In your final drive gear hub, you will usually have two sets of three planetary gears that rotate about a sun gear. In addition they mesh with a stationary band gear. The upper group of planetary gears are held jointly by a carrier, as demonstrated in the picture above. As you can see, all three gears are arranged the same distance from each other. At the guts is a place for sun gear to mesh and provide input to the system.
How Final Drive Planetary Gears Work
Let’s take a simplified look in how the planetary gears in your final drive work. Input power causes sunlight gear to rotate at high velocity. The planets mesh with both the sun gear and the ring equipment. They orbit the sun equipment while rolling around the band gear. The result is low velocity, high torque result rotation.
Maintaining the Planetary Gearbox
On a final drive motor, the planetary gearbox needs equipment oil, also called gear lube. It is essential to check the apparatus oil levels about every 100 hours and change the apparatus oil once a year. If you don’t change out your gear oil, you’ll end up with a thick sludge that will result in excessive put on of your planetary gear system. Here at Texas Last Drive, we make reference to that as “pudding.”
Another key facet of maintaining your planetary gearbox is certainly fixing any leaking seals immediately. If a seal is certainly degraded enough to allow oil to leak out, then which means dirt and dirt can make their way in. You don’t want to have your gears appear to be 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 need to keep your machine moving. Be sure you check and modify the gear essential oil and don’t disregard leaks. Also keep in mind that pudding and grit aren’t what you need in your gearbox!
The modern and innovative design, 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.
