Application scope of non-standard agricultural machinery bearings

Non standard agricultural machinery bearings refer to agricultural machinery special bearings whose external dimensions, internal hole structure (square hole, hexagonal hole, internal thread, etc.), sealing form or tolerance system do not comply with the national standard GB/T 273 series. They need to be customized and produced according to the main engine drawings, and their application scope can be expanded one by one according to the agricultural machinery functional modules.

1. Harvesting machinery (combine harvesters, corn threshers, balers, etc.)

This is the sector with the largest amount of non-standard agricultural machinery bearings and the most demanding requirements.

. The cutting table, feeding chain, threshing drum, cleaning screen, conveying agitator, fan and other components of the combine harvester are all high-speed rotating parts. Non standard bearings are mainly used in the following positions:

Threshing drum support: It needs to withstand grain impact and high-speed vibration, and is often equipped with deep groove ball non-standard bearings with reinforced seals (such as non-standard thickened sealing versions of 6205RS, 6305RS and other models). The inner hole is a square hole or hexagonal hole, which is installed with the square head of the transmission shaft to prevent slipping.

Conveyor agitator and air duct: The working environment is filled with grain debris and dust. Non standard bearings focus on solving sealing problems, using double lip rubber seals or even iron shell dust covers. The inner ring is equipped with a self-lubricating oil nozzle, making it convenient to add grease on site in the field.

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Corn thresher: The striking teeth hit the corn cob at high speed, causing great impact. The bearing seat is mostly a cast integrated non-standard structure, commonly used non-standard models such as 6201RS, 6203RS, 1203, 1204, 1205, etc. At the same time, it is matched with UCP205, UCP206, UCP207 and other non-standard bearing units with seat outer spherical surfaces to achieve quick disassembly and alignment.

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II. Sowing and Fertilization Machinery

The seeder, trencher, ground wheel, transmission shaft and other parts of the seeder require extremely high dust and corrosion resistance of the bearings, because seeds and fertilizers have a corrosive effect on metals, and soil dust is extremely high during operation.

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Seed planter shaft: low speed but requires precise positioning, commonly using non-standard hexagonal bearings (such as hexagonal 6204RS), square hole design and seed planter shaft square head coordination to ensure transmission does not slip.

. Ground wheel support: In direct contact with soil and stones, it has a high impact load and is often equipped with non-standard bearing seat integrated parts with flanges. The outer spherical ball bearing is matched with a cast bearing seat, which can withstand lateral loads and overturning moments. Fertilizer applicator drive shaft: Thin walled non-standard bearings such as 6806-2RS and 6807-2RS are commonly used, requiring corrosion resistance. Some manufacturers use stainless steel material or special rust prevention treatment.

III. Tillage and Land Preparation Machinery (Plow, Rake, Rotary tiller, Disc Plow, etc.)

Tillage machinery is in direct contact with hard soil, and the bearings bear continuous high impact and strong vibration, and the installation angle often has a tilt angle (such as the plow disc connecting bearings need to be installed at an angle), which requires extremely high bearing capacity and centering performance of the bearings.

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Plow disc connection bearing: a composite working condition that requires bearing lateral loads, overturning moments, and radial loads. It is commonly used as a non calibrated component of double row angular contact ball bearings, originating from automotive wheel hub bearing technology, with high load capacity, high lateral stiffness, and double-sided sealing.

Rotary tiller blade shaft: The blade shaft rotates at high speed and withstands the impact of soil and rocks. It is often equipped with non-standard tapered roller bearings (such as 30207, 30208 and other turbine reducer matching models), which can withstand large combined radial and axial loads.

Round disc rake bearings: They need to adapt to soil corrosion environments and are commonly used as maintenance free rod end joint bearings. The outer ring is equipped with a self-lubricating system and does not require manual oiling.

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IV. Irrigation and plant protection machinery (sprinkler, plant protection UAV, spray, etc.).

Sprinkler irrigation machine drive wheel: Multiple non-standard units with outer spherical ball bearings, combined with cast bearing seats, can automatically compensate for shaft misalignment within a certain range, making installation simple.

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Crop protection drone rotor shaft: requires extreme lightweight and high speed, commonly used micro non-standard deep groove ball bearings (such as S695ZZ anti magnetic stainless steel bearings, 2.5 × 5 × 1mm micro bearings, etc.), made of titanium alloy or stainless steel, to meet the requirements of corrosion resistance, non-magnetic, and ultra lightweight.

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Fifth, Grain Processing and Storage Transportation (such as rice mills, crushers, grain storage conveyors, etc.)

The characteristics of this sector are extremely high dust and long continuous operation time. The primary reason for bearing failure is dust intrusion leading to abrasive wear.

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Crusher: Non standard sealed bearings such as 6205RS, 6206RS, 6207RS, 6208RS, 6309RS, etc. are required to maintain sealing integrity at high speeds.

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Rice mills: non-standard models such as 1206, 1207, 1308, 1310, 1312, 1213, 1217, etc., with high speed and high temperature, and lubricating grease needs to be resistant to high temperatures.

. Grain depot conveyor: 6203RS to 6308RS series non-standard bearings, requiring long service life and maintenance free, some use solid embedded self-lubricating bearings (such as JDB series), completely solving the problem of oil being blown dry in dusty environments.

VI. Agricultural Machinery Chassis and Transmission System (Tractor Gearbox, Rear Axle, Hydraulic System, etc.)

Tractor Gearbox: Non standard tapered roller bearings are used for supporting small bevel gear shafts, such as models 42211, 42215, 42304, 42306, 42310, 42312, etc., to withstand high impact and torque inside the gearbox.

. Rear axle drive: Similar to the rear axle of a car, tapered roller bearings are commonly used to withstand combined radial and axial loads.

Hydraulic motor/hydraulic pump: Non standard customized angular contact ball bearings used for high-speed shaft support in integrated hydraulic systems of transmissions.

. Engine accessories: water pump bearings, fan bearings, tensioner bearings, generator overrunning pulley bearings, etc., often using deep groove ball non-standard parts, some with single-sided or double-sided dust covers.

7. Non standard customization requirements under special working conditions

The core reason why non-standard agricultural machinery bearings are "non-standard" is that standard products cannot meet the following special requirements:

Table

Special requirementsTypical non-standard solutions

Square holes/hexagonal holes/internal threadsSeeding machine planting shaft and threshing machine transmission shaft are dedicated to prevent slipping

Ultra thick sealing/iron shell dust preventionHarvesting machinery, grain storage conveyor, anti dust intrusion

With oil nozzle/re lubricationFor parts that cannot be disassembled and maintained during field operations, on-site refueling

Maintenance free self-lubricating In unmanned outdoor scenarios such as crop protection drones and sprinkler irrigation machines, SF1/SF-2/JDB solid embedded bearings are used. Corrosion resistant materials are used for fertilizing machines and paddy field operation machinery. Stainless steel (AISI440) or bronze based bearings are used. Irregular outer diameter/width is used to replace old agricultural machinery. The original bearings need to be replicated 1:1 according to the original size The application scope of non-standard agricultural machinery bearings covers the entire life cycle of agricultural machinery, from plowing (plow, rake, rotary tiller) to sowing and fertilizing (seeder, fertilizing machine), crop protection irrigation (drone, sprinkler), harvesting and processing (harvester, thresher, rice mill), storage and transportation (conveyor, pulverizer), and chassis transmission (gearbox, rear axle, hydraulic system). Its core value lies in using customized hole patterns, seals, materials, and structures to solve the problems that standard bearings cannot handle under extreme working conditions such as dust, impact, corrosion, and maintenance free in the field.