Heavy Duty Truck Lube Oil 1174089 New Truck Engine Oil Filter

Bearing

In the construction machinery industry, bearings, as core transmission components, play a crucial role in supporting rotational motion, reducing frictional losses and transmitting loads. The following is an analysis of its core functions, selection, and typical application scenarios:

I. Core Functions and Performance Requirements

Youdaoplaceholder0 high load-bearing capacity and impact resistance ‌

Construction machinery needs to cope with heavy loads (such as the digging force of excavator buckets), vibration and shock conditions. Therefore, the bearings must have excellent radial/axial load-carrying capacity and fatigue resistance. Tapered roller bearings, due to their design where the rollers are in contact with the raceway lines, can simultaneously withstand combined radial and axial loads and are suitable for heavy-duty scenarios such as loader gearboxes and hydraulic motors ‌; Self-aligning roller bearings adapt to shaft deflection through spherical raceways and resist impact deformation. They are commonly found in the main shafts of mining crushing equipment ‌.

Youdaoplaceholder0 adaptability to harsh environments ‌

Construction machinery often operates in dusty, humid or high-temperature environments. Bearings must meet the following requirements:

Youdaoplaceholder0 Corrosion resistance ‌ : Martensitic stainless steel bearings (such as AISI440C) are used in wet conditions (such as port machinery), with a hardness of HRC and a temperature resistance of 250℃‌;

Youdaoplaceholder0 Sealing protection ‌ : Deep groove ball bearings with rubber sealing rings are mostly used to prevent sand and mud from entering the slewing support part of the excavator ‌

Iii. Materials and Technological Innovation

Youdaoplaceholder0 special steel dominates ‌

Youdaoplaceholder0 high-carbon chromium steel (GCr15) ‌ : mainstream material, hardness HRC60-64, used for general bearings (such as deep groove ball bearings) ‌;

Youdaoplaceholder0 carburized bearing steel ‌ : high carbon layer on the surface + low carbon core, enhancing impact resistance (such as excavator slewing bearings) ‌.

Youdaoplaceholder0 Frontier materials application ‌

Youdaoplaceholder0 ceramic bearing ‌ : Made of silicon nitride, it is heat-resistant (>1200℃) and insulating, used in the main shaft of high-speed stirring equipment ‌;

Youdaoplaceholder0 Oil-impregnated self-lubricating bearing ‌ : formed by sintering porous bronze, suitable for maintenance-free field scenarios (such as agricultural machinery) ‌

Iv. Key Elements for Selection

Comprehensive assessment of construction machinery bearings is required

Youdaoplaceholder0 Load nature ‌ : For impact loads, tapered roller bearings are selected; for pure axial forces, thrust cylindrical roller bearings are chosen ‌.

Youdaoplaceholder0 Precision requirements ‌ : ultra-clean 52100 steel angular contact ball bearings for machine tool spindles, controlling high-speed vibration ‌;

Youdaoplaceholder0 Environmental adaptability ‌ : Stainless steel or ceramic materials are preferred in high-humidity environments ‌.

Youdaoplaceholder0 Note ‌ : Hub bearings have developed to the fourth generation of integrated design (such as outer ring integrated flange), which improves installation efficiency and optimizes material toughness to adapt to the impact of complex road conditions ‌