Planetary Gear Drive
Drive type: speed reducer
Result torque: 33,895 Nm (25,000 lb-ft)
Max input speed: 2800 rpm
Selection of input options
Straight in for an on centerline adaptation providing a symmetrical clearance about the Planetary Track Drive hydraulic motor input
Offset straight in allows the hydraulic engine be mounted off center
Right angle input techniques the hydraulic electric motor perpendicular to the centerline of the planetary drive for added clearance between elements on track drives
With external shaft includes keyed, flanged or spline options to meet the various required output connections
An added output option includes the result 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 positioned at optimum load position
4 Weight varies with configuration and ratio selected
5 Requires tapered roller planet bearings (unavailable with all ratios)
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
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, while still keeping the drive compact.
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.
Maximum Torque Up to 170,000 Nm
Transmission Ratio Up to 230 iN
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Brevini planetary track drives are created for tracked automobiles and earth-moving devices. They have a heavy-duty casing, a short overall length, and great radial and axial load capability.
Our gearboxes are provided with integral multidisc parking brake and have been created for direct mounting of hydraulic plug-in motors. The careful choice of the materials and style allows our track drives, CTD and CTU, to be utilized in the most serious environmental working conditions. Brevini planetary monitor drive units are the perfect alternative for crawled undercarriages, drilling, crushing, screening and piling machines.
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 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 brief overall length, and great radial and axial load capacity.
They have an intrinsic multidisc failsafe brake and will be installed directly on hydraulic motors and are prepared to accept ‘plug-in’ hydraulic motors.
> 10 kNm
high-torque, high load capacity
for wheel and monitor drives, small, rugged, for construction vehicles
This gear shaft final drive comes with LO-HI speed and was designed 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 proper product for road paving devices, along with construction tools and forestry machines.
Last drive motors are hydraulic motors with a speed reducing, torque multiplying planetary gear arranged. In this post, we’ll talk about planetary gear units, the parts that produce them up, and how they work.
Planetary Gears and Final Drive Motors
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Low Swiftness, High Torque Motors
Most of the hydraulic motors used for propel motors are low-speed, high-torque (LSHT) motors. Rate and torque are related by power:
Power = Speed x Torque
That means if you want to boost torque for a given horsepower, we have 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 this all in a concise package in comparison with gear and pinion acceleration reducers, and which means they have superb torque density. Below you can view a planetary gear system from your final drive motor.
Planetary gear arranged from your final drive showing the carrier, ring equipment, sun equipment, and planetary gears
Carrier for a couple of 3 planetary gears from your final drive
Planetary Gear Systems
In a final drive gear hub, you will usually have two sets of three planetary gears that rotate in regards to a sun gear. In addition they mesh with a stationary band gear. The upper set of planetary gears are held with each other by a carrier, as proven in the picture above. As you can see, all three gears are organized an equal distance from each other. At the center is a location for sun equipment to mesh and offer input to the machine.
How Last Drive Planetary Gears Work
Let’s take a simplified look at the way the planetary gears in your final drive work. Input power causes the sun equipment to rotate at high acceleration. The planets mesh with both sun gear and the ring equipment. They orbit the sun gear while rolling around the ring gear. The effect is low rate, high torque result rotation.
Maintaining the Planetary Gearbox
On your final drive engine, the planetary gearbox needs equipment oil, also called equipment lube. It is essential to check the gear oil amounts about every 100 hours and change the gear oil once a year. If you don’t change out your gear essential oil, you’ll end up with a thicker sludge that will result in excessive put on of your planetary equipment system. Here at Texas Last Drive, we make reference to that as “pudding.”
Another key aspect of keeping your planetary gearbox is fixing any leaking seals right away. If a seal is degraded enough to allow 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.
Your planetary gearbox is an essential component of your final drive. If it fails, you won’t be able to generate the torque you have to keep your machine shifting. Remember to check and alter the gear essential oil and don’t disregard 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 group of gear units make these especially ideal for generating rubber tired or tracked self-propelled vehicles.
Planetary Gear Drive