Planetary Gear Drive
Drive type: speed reducer
Result torque: 33,895 Nm (25,000 lb-ft)
Max input speed: 2800 rpm
Features
Variety of input options
Straight in for an on centerline adaptation providing a symmetrical clearance about the hydraulic motor input
Offset straight in enables the hydraulic engine be mounted off center
Right angle input moves the hydraulic engine 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 up the many required output connections
An added output choice includes the output 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 (Planetary Track Drive continuous)18,710 Nm (13,800 lb-ft)
1 Actual ratio would depend on the drive configuration.
2 Max input speed linked to ratio and max result 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 electric motor 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 installation of plug-in motors.
Integral multi-disc parking brakes, while still keeping the drive small.
Steel or high-impact spheroidal cast iron framework.
Main 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
Transmission Ratio Up to 230 iN
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Brevini planetary monitor drives are designed for tracked vehicles and earth-moving machines. They have a heavy-duty casing, a brief overall duration, and great radial and axial load capacity.
Our gearboxes are provided with integral multidisc parking brake and also have been created for direct mounting 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 monitor drive units will be the perfect option 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 monitor drives are specifically made 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 integral multidisc failsafe brake and will be installed directly on hydraulic motors and are prepared 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 includes LO-HI speed and was made for increased performance. That is extremely useful especially in wheeled and tracked devices, which feature a considerably different operating/travel acceleration ratio.
Note that that is also the right product for road paving devices, along with construction equipment and forestry machines.
Final 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 produce them up, and how they function.
Planetary Gears and Last 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. Quickness 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 acceleration involves the usage of planetary gears. They provide speed reduction which outcomes in torque multiplication. Plus they do that all in a compact package when compared to gear and pinion speed reducers, and that means they have excellent torque density. Below you can view a planetary gear program from your final drive motor.
Planetary gear arranged from your final drive displaying 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 a final drive gear hub, you will most likely have two sets of three planetary gears that rotate about 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 plainly see, all three gears are arranged the same distance from one another. At the center is a location for sun equipment 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 the sun gear to rotate at high velocity. The planets mesh with both sun gear and the ring equipment. They orbit sunlight equipment while rolling around the band gear. The effect is low velocity, high torque result rotation.
Maintaining the Planetary Gearbox
On your final drive electric motor, the planetary gearbox requires equipment oil, also called equipment lube. It is essential to check the apparatus oil amounts about every 100 hours and change the apparatus oil one per year. If you don’t modify out your gear oil, you’ll end up with a solid sludge that will lead to excessive wear of your planetary gear system. At Texas Final Drive, we refer to that as “pudding.”
Another key aspect of maintaining your planetary gearbox is definitely fixing any leaking seals right away. If a seal can be degraded enough to allow essential oil to leak out, after that that means dirt and dust can make their method in. You don’t want to have your gears appear to be the gritty mess proven 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 need to keep your machine shifting. Remember to check and alter the gear essential oil and don’t ignore leaks. And don’t forget that pudding and grit are not what you need in your gearbox!
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 generating rubber tired or tracked self-propelled vehicles.