Bearing 11206 (1207K + H207)

Bearing 11206 (1207K + H207) Spherical Ball Bearing with Adapter Sleeve

Bearing 11206 is a specialized self-aligning support assembly widely utilized in the power transmissions, running gear, and gearboxes of various agricultural machinery. Its primary engineering purpose is to ensure reliable and stable shaft rotation even under significant vibrations, dynamic misalignments, and high radial loads.

Unlike standard rolling bearings, this component features two key design advantages. First, thanks to the spherical raceway profile of its outer ring, the bearing is self-aligning—it easily compensates for mounting inaccuracies, shaft deflections, or housing misalignment, thereby preventing critical mechanism binding or cage destruction. Second, a standout feature of this model is its integrated split tapered adapter sleeve, complete with a slotted locknut and a multi-tab lock washer. This mechanism allows the bearing to be mounted rigidly and securely onto a completely smooth 30 mm diameter shaft at any desired position, completely eliminating the need to machine special shoulders on the axis or cut grooves for retaining rings.

The classical designation 11206 (according to GOST 8545-75) denotes the complete bearing assembly (bearing + adapter sleeve) designed for direct mounting onto a 30 mm shaft, with an outer diameter of 72 mm. Modern international standards (ISO) take a different approach, designating each kit component separately. Because the H207 adapter sleeve used for securing to a 30 mm shaft has its own wall thickness, its outer seating diameter increases to 35 mm. Accordingly, a bearing with an enlarged inner tapered bore of 35 mm is mounted onto this sleeve, designated under ISO standards as 1207K (where the letter "K" indicates taper). Therefore, the proper and complete international counterpart to the domestic 11206 assembly is a two-piece set consisting of the 1207K bearing and the H207 adapter sleeve.

Technical Specifications of Bearing 11206 (1207K + H207)

• Part type: Double-row spherical radial ball bearing with adapter sleeve
• Inner diameter (shaft fit): 30 mm
• Outer diameter (housing fit): 72 mm
• Bearing width (B): 17 mm
• Total length with adapter sleeve (L): 29 mm
• Dynamic load rating (C): 16 kN
• Weight: 0.44 kg

Although self-aligning capability is provided by the spherical outer ring, the presence of two parallel rows of balls determines the high load-bearing capacity of this bearing. This design distributes the pressure from the working shaft evenly across a larger surface area, allowing a relatively compact bearing just 17 mm wide to support a solid dynamic load of approximately 16 kN (over 1.5 tons). This is a critical parameter for heavy agricultural machinery assemblies, where the bearing bears structural weight alongside the constant tension of drive belts or chains.

Because the base 11206 bearing features an open design (without integrated shielding washers), its longevity depends directly on proper housing sealing. In kinematic layouts such as grain throwers, this bearing is always installed inside massive cast-iron housings and securely protected from dust using rubber oil seals (lip seals) and covers.

Regarding maintenance, lubrication of this bearing assembly is performed using heavy greases (factory instructions recommend classic solidol or modern Litol-24 grease). Grease is injected via a grease fitting located on the external housing assembly; per operating guidelines, it should fill 1/3 to 1/2 of the free volume within the bearing chamber to prevent overheating and seal blowout during operation.

Applications of Bearing 11206 (1207K + H207)

Thanks to its unique combination of high load capacity, misalignment compensation, and easy mounting on a smooth 30 mm shaft, this bearing has become a standard for grain processing equipment power transmissions. Depending on the machine's kinematic layout, the quantity used ranges from 1 to 14 units. Most frequently, the part appears in the following assembly units:

• Rear drive assembly (ZM driving wheel drive mechanism) ZP 01.220 — 4 pcs.
• Cover with gearboxes / feeder gearboxes (ZM lower head) ZP 02.300 — 6 pcs.
• Loading conveyor (ZM upper head) ZP 02.000 — 2 pcs.
• Counterdrive (ZM intermediate shaft) ZP 04.000 — 2 pcs. (on classic ZM models)
• Unloading conveyor (OVS-25 grain cleaner) OVI 04.000 — 1 pc.

Grain Thrower Running Gear Support

Four 11206 bearings operate within the reverse mechanism simultaneously (two per wheel), housed inside massive H 026.058 cast-iron housings bolted rigidly to the machine frame. The steel half-axles of the driving wheels pass through these bearings; utilizing a tapered adapter sleeve here is exceptionally practical because it allows the bearing to be securely fixed directly to the smooth half-axle without requiring machined shoulders. In this assembly, the bearings support the entire weight of the rear machine section while transmitting traction force from the self-propelling gearbox.

Conveyor Lower Head (Bevel Gearbox Cover)

This is the most technically complex assembly packed with these components, housing six units. Located inside the lower head of the scraper conveyor, they serve as the base supports for the bevel gearbox shafts transmitting rotation from the central shaft to the side wings (feeders). The bearing's self-aligning capability and axial adjustability via the sleeve play a key role here, allowing the operator to align shafts precisely for correct bevel gear mesh (with a 0.1–0.35 mm clearance), avoiding binding or skewing.

Loading Conveyor Drive (Grain Thrower Upper Head)

Two additional 11206 bearings govern the rotation of the main drive shaft on the upper head of the loading conveyor. Unlike the rear drive, these are mounted into specialized H 026.085 cast-iron housings. They support the shaft carrying the scraper chain drive sprockets and safety friction clutch. The double-row bearing design handles the continuous dynamic loads resulting from the tension of the long scraper chain effortlessly.

Counterdrive Assembly on ZM-60/60A Grain Throwers

On classic grain thrower models (such as the ZM-60), a pair of 11206 bearings ensures stable rotation of the counterdrive intermediate shaft. Just like in the running gear, they are mounted in universal H 026.058 housings, with one configured in a blind layout (using cover H.026.226). Here, the bearing absorbs heavy radial loads generated by the simultaneous tension of V-belts and roller chains, preventing central axis deflection.

OVS-25 Unloading Conveyor Support

In OVS-25 grain cleaners, this bearing is applied selectively but in an intensely loaded zone—the OVI 04.000 unloading conveyor. It serves as a reliable base for the shaft driving the chain scraper conveyor responsible for discharging cleaned material from the machine. The bearing mounts inside a specific H 026.085 cast-iron housing, equipped with spacer ring H 026.504 and secured by an open through-cover H 026.163 featuring an armored rubber lip seal for dust protection. The tapered adapter sleeve in the 11206 bearing enables convenient and rigid fixation of the working shaft, which constantly encounters significant radial loads from the scraper chain tension.

Buying Bearings 11206 (1207K + H207) from Zavod Moroza

A reliable bearing assembly is the primary prerequisite for the smooth, durable operation of any power transmission. Deciding to purchase bearing 11206 (the modern standard 1207K + H207 kit) provides you with a robust self-aligning assembly that fits smooth 30 mm shafts perfectly, capable of enduring high dynamic loads and compensating for axis misalignments seamlessly.

However, as agricultural machinery and equipment manufacturers, we fully understand that performing quick, efficient repairs in a farm workshop often requires more than just replacing the bare bearing. Rubber seals and seating surfaces frequently experience wear as well. For this reason, Zavod Moroza offers a convenient turnkey solution—delivering fully assembled, pre-packaged bearing units. Depending on your mechanism's configuration, we assemble custom kits by carefully installing the bearing into its matching housing, selecting required spacer rings, securing the assembly with new reinforced lip seals, and closing it with blind or through covers. This comprehensive approach guarantees 100% component compatibility, correct installation clearances, and saves valuable time searching for minor parts.

Contact our sales department for professional technical consultation and precise kit selection. Choose reliable 11206 bearings or professionally assembled units and kits directly from the manufacturer to fully restore your agricultural machinery's factory kinematics and ensure stable operation under any working conditions!