Planetary Gear Drive
Drive type: speed reducer
Output torque: 33,895 Nm (25,000 lb-ft)
Max input speed: 2800 rpm
Variety of input options
Straight set for an on centerline adaptation giving a symmetrical clearance about the hydraulic motor input
Offset straight in allows the hydraulic engine be mounted off center
Right angle input moves 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 up the many required output connections
An added output choice includes the output without exterior shaft by providing an internal spline at the output
Planetary Gear Drive
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 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 mounting of plug-in motors.
Integral multi-disc parking brakes, whilst still keeping the drive compact.
Steel or high-effect spheroidal cast iron structure.
Main bearings provided for high radial and axial load capacities.
Easy maintenance: filling and draining ports places easy to reach.
Front mechanical seal designed specifically for the earth-moving machines.
Optimum Torque Up to 170,000 Nm
Tranny Ratio Up to 230 iN
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Brevini planetary track drives are made for tracked automobiles and earth-moving machines. They possess a heavy-duty casing, a short overall size, and great radial and axial load capability.
Our gearboxes are given with Planetary Track Drive essential multidisc parking brake and have been created for direct mounting of hydraulic plug-in motors. The careful selection of the materials and style allows our monitor drives, CTD and CTU, to be used in the most severe environmental working conditions. 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 modern and innovative design, the compact construction and the excellent performance characteristics of the PGR/PGW series of gear units make these especially ideal for driving 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 intrinsic multidisc failsafe brake and can be installed on hydraulic motors and are prepared to accept ‘plug-in’ hydraulic motors.
Shaft orientation:
> 10 kNm
high-torque, high load capacity
Other characteristics:
for wheel and monitor drives, small, rugged, for construction vehicles
This gear shaft final drive comes with LO-HI speed and was made for increased performance. That is extremely useful specifically in wheeled and tracked machines, which feature a considerably different operating/travel swiftness ratio.
Note that that is also the right product for street paving machines, along with construction products and forestry machines.
Last drive motors are hydraulic motors with a speed reducing, torque multiplying planetary gear arranged. In this article, we’ll talk about planetary gear models, the parts that make them up, and how they function.
Planetary Gears and Last Drive Motors
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Low Velocity, High Torque Motors
The majority of the hydraulic motors used for propel motors are low-speed, high-torque (LSHT) motors. Acceleration and torque are related by power:
Power = Speed x Torque
That means if you want to increase torque for a given horsepower, we need to reduce speed:
Torque = Power / Speed
Hence the word “low-speed, high-torque.” One method of reducing speed involves the utilization of planetary gears. They offer speed reduction which results in torque multiplication. Plus they do this all in a compact package in comparison with gear and pinion speed reducers, and that means they have exceptional torque density. Below you can see a planetary gear program from your final drive motor.
Planetary gear established from a final drive displaying 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 most likely have two sets of three planetary gears that rotate in regards to a sun gear. They also mesh with a stationary band gear. The upper group of planetary gears are held jointly by a carrier, as proven in the image above. As you can see, all three gears are organized an equal distance from one another. At the guts is a place for sun equipment to mesh and offer input to the system.
How Last Drive Planetary Gears Work
Let’s take a simplified look in the way the planetary gears in a final drive work. Insight power causes the sun equipment to rotate at high velocity. The planets mesh with both the sun equipment and the ring gear. They orbit sunlight gear while rolling around the ring gear. The effect is low quickness, high torque output rotation.
Maintaining the Planetary Gearbox
On your final drive engine, the planetary gearbox needs equipment oil, also referred to as gear lube. It is essential to check the gear oil levels about every 100 hours and change the apparatus oil one per year. If you don’t change out your gear oil, you’ll end up with a solid sludge that will lead to excessive use of your planetary equipment system. Here at Texas Last Drive, we make reference to that as “pudding.”
Another key facet of maintaining your planetary gearbox is usually fixing any leaking seals right away. If a seal is usually degraded enough to permit essential oil to leak out, after that which means dirt and dust can make their way in. You do not want to have your gears look like the gritty mess demonstrated below.
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 shifting. Be sure you check and modify the gear essential oil and don’t disregard leaks. And don’t forget that pudding and grit aren’t what you need in your gearbox!
The present day and innovative design, the compact construction and the wonderful performance characteristics of the PGR/PGW series of gear units make these especially suitable for driving rubber tired or tracked self-propelled vehicles.