The engine is the heart of a car, constantly providing power to other components. Internal bearings were previously dominated by sliding bearings. Currently, most of them are using sealed ball bearings while improving bearing performance. Below is a detailed explanation of several typical bearings in engines by Zhonghua Bearing Network based on their understanding of the engine, hoping to be helpful to everyone.

AC generator bearings

The bearing of the AC generator is a single row sealed ball bearing, mainly subjected to centripetal force, and is required to operate reliably even under conditions of speed exceeding 2000r/min and temperature exceeding 180 ℃. The ring and rolling element are made of high-purity GCr15, and the hardness after heat treatment is required to be 58-64HRC. The cage is generally made of nylon PA46, and the sealing ring is generally made of acrylic rubber ACM. The reference standard is JB/T8167-2006.

Air conditioning compressor electromagnetic clutch bearing

The electromagnetic clutch bearing of the air conditioning compressor is a double row angular contact ball bearing, with the outer ring rotating. The speed of the air conditioning belt pulley can reach 7000-13000r/min, with a maximum temperature of 160 ℃. The material is the same as above, and the retainer is changed from a common single spherical pocket hole to a cylindrical surface. The reference standard is JB/T10531-2005.

Tensioning wheel and idler wheel bearings

Tensioning wheel and idler wheel bearings are high-performance sealed ball bearings. The former acts on the loose edge of the synchronous transmission belt, while the latter acts on the tight edge of the synchronous transmission belt. The materials are basically the same. The retainer can be made of engineering plastic, or 08 steel or 10 steel. The sealing ring is made of ACM or FPM (fluororubber), with reference standard JB/T10859-2008.

Water pump shaft bearing

The bearing of the water pump shaft is generally a double row ball bearing, with a radial size smaller than that of a regular bearing. It is essentially a structurally simplified double support bearing system, with two supported bearings without inner rings. The raceway of the rolling element is directly made on the shaft, and the outer rings of the two supported bearings are made into a whole. Both sides of the rings are sealed with seals. Its rollers are usually made of high chromium bearing steel, and the material of the shaft and outer rings is made of carburized carbon steel or high chromium bearing steel. The reference standard is JB/T8563-2010.