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 upon centerline adaptation providing a symmetrical clearance about the hydraulic motor input
Offset straight in enables the hydraulic motor be mounted off center
Right angle input techniques the hydraulic 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 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 would depend on the drive configuration.
2 Max input speed related 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 (unavailable 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 carry 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-influence spheroidal cast iron framework.
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 particularly for the earth-moving machines.
Optimum Torque Up to 170,000 Nm
Tranny Ratio Up to 230 iN
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Brevini planetary monitor drives are made for tracked automobiles and earth-moving devices. They have a heavy-duty casing, a brief overall size, and great radial and axial load capacity.
Our gearboxes are given with essential multidisc parking brake and have been made for direct installation of hydraulic plug-in motors. The careful choice of the materials and style allows our monitor drives, CTD and CTU, to be utilized in the most severe environmental working circumstances. Brevini planetary track drive units are the perfect alternative for crawled undercarriages, drilling, crushing, screening and piling devices.
Planetary Monitor and Wheel drives
The present day and innovative style, the compact construction and the excellent performance characteristics of the PGR/PGW group of gear units make these especially ideal for generating 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 brief overall length, and great radial and axial load capacity.
They have an intrinsic multidisc failsafe brake and may 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, compact, rugged, for construction vehicles
Description
This gear shaft final drive comes with LO-HI speed and was designed for increased performance. The item is extremely useful specifically in wheeled and tracked devices, which feature a significantly different operating/travel rate ratio.
Note that that is also the right product for road paving devices, along with construction products and forestry machines.
Final drive motors are hydraulic motors with a speed reducing, torque multiplying planetary gear set. In this post, we’ll talk about planetary gear units, the parts that produce them up, and how they function.
Planetary Gears and Final Drive Motors
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Low Acceleration, High Torque Motors
The majority of the hydraulic motors used for propel motors are low-speed, high-torque (LSHT) motors. Swiftness and torque are related by power:
Power = Speed x Torque
That means if we want to increase torque for a given horsepower, we have to reduce speed:
Torque = Power / Speed
Hence the term “low-speed, high-torque.” One way of reducing rate involves the use of planetary gears. They provide speed reduction which results in torque multiplication. Plus they do that all in a compact package when compared to gear and pinion swiftness reducers, and that means they have superb torque density. Below you can see a planetary gear program from a final drive motor.
Planetary gear arranged from a final drive showing the carrier, ring gear, sun gear, and planetary gears
Carrier for a set of 3 planetary gears from a final drive
Planetary Gear Systems
In your final drive gear hub, you will most likely have two sets of three planetary gears that rotate in regards to a sun gear. In addition they mesh with a stationary ring gear. The upper set of planetary gears are kept collectively by a carrier, as proven in the image above. As you can see, all three gears are organized the same distance from each other. At the center is a location for sun equipment to mesh and offer input to the system.
How Final Drive Planetary Gears Work
Let’s take a simplified look at how the planetary gears in a final drive work. Input power causes the sun equipment to rotate at high speed. The planets mesh with both the sun gear and the ring gear. They orbit the sun gear while rolling around the band gear. The result is low swiftness, high torque result rotation.
Maintaining the Planetary Gearbox
On a final drive motor, the planetary gearbox needs gear oil, also known as gear lube. It is vital to check the gear oil levels about every 100 hours and change the gear oil once a year. If you don’t alter out your gear oil, you’ll finish up with a heavy sludge that will result in excessive wear of your planetary gear system. At Texas Final Drive, we refer to that as “pudding.”
Another key aspect of keeping your planetary gearbox is definitely fixing any leaking seals immediately. If a seal can be 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 your gears look like the gritty mess demonstrated 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 shifting. Be sure you check and change the gear oil and don’t ignore leaks. Also keep in mind that pudding and grit aren’t the thing 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 suitable for generating rubber tired or tracked self-propelled vehicles.