Hansheng Automation (Dongguan) Co., Ltd. is one of the most experienced manufacturers and suppliers of planetary gear set in China. If you're going to wholesale bulk cost-effective planetary gear set made in China, welcome to get pricelist and quotation from our factory. Also, customized service and OEM&ODM service are available.
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Product Introduction
An ingenious and effective mechanical transmission mechanism is planetary gear set, sometimes known as planetary gear set. Mostly it consists of a ring gear, planetary carrier, sun gear, and planetary gears. The sun gear is in the middle; the planetary gears mesh with the sun gear like planets orbiting it simultaneously and at the same time mesh with the outside ring gear. The planetary carrier hosts the installed planetary gears, and the general design is compact. Working, it can flexibly attain a range of transmission ratios depending on the fixed or driving status of various components, and has purposes including overspeed transmission, deceleration and torque increase, etc. Many different industries, including automotive transmissions, industrial machinery, aerospace, etc., rely on it; its steady and efficient qualities enable many kinds of equipment to run precisely.
Product drawings and parameters
Productive Process Of Planetary Gear Set
Forging Blanks
Usually the blanks first are made from the forging process for the main components of the planetary gear set: sun gear, planetary gear, ring gear and planetary carrier. By means of forging, the internal structure of metal materials can be more compact and their strength and toughness raised. For high-strength alloy steel materials, for instance, the hot forging technique can help the materials form at high temperatures, so preventing flaws including pores and looseness brought on by casting. The steel billet of suitable size is heated to the forging temperature range based on design criteria, then formed initially using a forging die to first form the general shape of the planetary gear.
Straight Machining
Common machining technique used in the rough machining stage is turning. A lathe is used for external turning and end turning to eliminate most of the surplus of the produced blank and bring it near to the final size for the sun gear and the planetary gear. For instance, while guaranteeing a certain dimensional accuracy and surface roughness, the sun gear blank is positioned on the chuck of the lathe and the basic size and shape of the shaft are turned through the feed movement of the tool when rotating the shaft of the sun gear.
For parts like the planetary carrier and the ring gear, the milling process can help to eliminate extra material. The milling machine can be used to preliminally process the part where the teeth are installed and grind out the ring gear's outer contour. Milling can be used to process the holes for installing the planetary gear and other components for the planetary carrier so ready for next finishing.
Tooth Profile Processing
One of the main techniques for machining gear tooth profile is gear hobbing. The gear hobbing machine rolls out the gear tooth profile across the relative movement of the hob and the gear blank depending on the principle of tooth profile curves like involute for sun gears and planetary gears. Together, the rotational motion of the gear blank and the spiral motion of the hob precisely process the tooth profile that satisfies design criteria. To guarantee the tooth profile accuracy, one must choose a suitable hob depending on the module, number of teeth and other parameters of the planetary gear, and set the processing parameters of the gear hobbing machine, such as the hob speed, gear blank speed, feed rate, etc., when hobbing a planetary gear.
Gear shaping is occasionally a good approach for internal gears (such ring gears) or gears with particular tooth profile requirements. The gear shaping machine uses the circular feed motion with the ring gear blank and the tooth profile through the up and down reciprocating motion of the gear shaping cutter. Especially for processing duplex gears or internal gears, gear shaping can provide better tooth profile accuracy and surface quality.
Finishing
Grinding is a necessary finishing technique for the shafts of sun gears and planetary gears with great precision requirements. The dimensional accuracy and surface roughness of the shaft can be very highly controlled by the external cylindrical grinder. For instance, high-precision external cylindrical grinding allows the dimensional accuracy of the sun gear shaft to reach the micron level and the surface roughness to reach below Ra0.8, so guaranteeing the stability and low noise of the gear at great speed.
Sometimes the honing process can be used to raise the surface quality of a tooth surface when its quality is rather high. By means of relative movement of the honing wheel and the tooth surface, the honing machine removes the small processing marks on the tooth surface, so lowering the surface roughness and increasing the wear resistance and transmission accuracy of the tooth surface.
Heat Treatment
To increase gear hardness and wear resistance, usually the sun gear, planet gear, ring gear, and sun gear should be quenched. The quenchning process is heating gears above a critical temperature and subsequently fast cooling them. For the gear surface, a high-hardness martensite structure can be produced, say, by salt bath or oil quenching. Although the quenching process may cause gear deformation, later processing such straightening is essential since the hardness of the gear after quenching can be much improved.
Mostly used to remove the internal stress generated by quenching and prevent gear cracking under operation, tempering treatment is a heat treatment method. By heating the quenchned gear to a suitable temperature, so preserving it warm for a given period of time, and then progressively cooling it, one can increase its toughness and dimensional stability as well as its structural stability.
Assembly And Correction Of Mistakes
Before assembly, all processed components-sun gear, planetary gear, ring gear and planetary carrier-need to be cleaned to eliminate contaminants including oil, iron filings and other left-over elements left during the manufacturing. Every component-including dimensional accuracy, tooth profile accuracy, surface quality, and other factors-should also be closely examined concurrently to guarantee that it satisfies assembly criteria.
Assembly procedure: The planetary gear is first set on the planetary carrier and typically ensures flexible rotation by means of appropriate bearings or bushings. After that, the sun gear-the planetary carrier-assembles in line with design criteria-along with the ring gear. The matching clearance between the components should be given great consideration during the assembly process to guarantee proper gear mesh. For instance, the design criteria should be followed in the side clearance and top clearance between the planetary gear and the sun gear and the ring gear to guarantee the normal gear set operation.
Following assembly, the planetary gear set has to be debugged and tested. Special testing apparatus, such a thorough gear tester, tests the gear set's transmission accuracy, transmission ratio, noise and vibration. Should issues arise, such erroneous transmission ratio, too high noise, etc., the gear set must be changed; this could call for replacing worn-out components, readjusting the fit clearance between components, etc., until the planetary gear set satisfies the design criteria.
FAQ
Q: What are the specific advantages of the "multi-tooth mesh" design of the PGH042 planetary gear set?
A: "Multi-tooth mesh" means that three to four planetary gears simultaneously mesh with the sun gear and the ring gear (traditional gears typically have one to two teeth meshing). The main advantages are load distribution, improved stability, and extended service life.
Q: How should I choose the material and heat treatment method for the PGH042 in different application scenarios?
A: Automotive transmissions: We recommend 42CrMo alloy steel. Carburizing and quenching followed by low-temperature tempering achieves a surface hardness of HRC 58-62 (wear resistance) and a core hardness of HRC 30-35 (impact resistance), suitable for the impact loads of frequent gear shifting.
Industrial machinery (such as injection molding machines): We recommend 20CrMnTi steel. High-frequency quenching achieves a tooth surface hardness of HRC 55-58, balancing cost and durability, and is suitable for continuous operation with medium and low loads.
Q: What are the maintenance cycles and specific procedures for planetary gear sets?
A: In normal industrial scenarios (such as assembly lines): Check the grease condition every 5,000 hours.
In high-load/dusty environments (such as mining machinery): Check every 3,000 hours and replace the grease earlier if necessary.
Specific maintenance procedures are as follows:
After shutdown, clean dust from the gear set surface to prevent impurities from entering during disassembly.
Check the grease for deterioration (normally light yellow; deteriorated grease becomes dark brown or lumpy). When replacing, use a dedicated gear grease.
Q: What parameters are required when customizing the PGH042?
A: Rated torque, maximum speed, input shaft diameter/length, output flange aperture, overall installation space limitations, operating temperature range, dust/waterproof requirements (such as IP65 protection rating), and whether the compatible motor has requirements.
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