The engine is the heart of the car, continuously providing power to other components. The internal bearings used to be dominated by sliding bearings. At present, most of them use sealed ball bearings under the premise of improving bearing performance. The following is a detailed explanation of engine bearings by Guanchao engine bearing factory based on the understanding of the engine. I hope it will be helpful to everyone.

Engine bearing factory tells you,automobile engine bearings usually adopt the structure of steel back + anti-friction alloy. The commonly used anti-friction alloys are Babbitt alloy, copper-based alloy, and aluminum-based alloy.
Babbitt alloys are divided into tin-based and lead-based types. Babbitt alloys have low fatigue strength, allowable specific pressure, and low operating temperature, and are generally used for gasoline engines with a low degree of strengthening;
Copper-based alloys are divided into lead bronze and copper-lead alloys;
Aluminum-based alloys are divided into high-tin alloys and low-tin alloys. Aluminum-based alloys are currently the most widely used in internal combustion engine crankshaft bearings.

What are the types of engine bearings, and what to call them?
1. The direction of the load
(1) Radial bearings, also known as radial bearings, bear radial loads.
(2) Thrust bearings, also known as thrust bearings, bear axial loads.
(3) Radial thrust bearings, also known as centripetal thrust bearings, bear radial loads and axial loads at the same time.

2. According to the structure of rolling bearings:
(1) self-aligning ball bearing
The self-aligning ball bearing has two rows of steel balls, the inner ring has two raceways, and the outer ring raceway is an inner spherical shape, which has the function of self-aligning. It can automatically compensate for the coaxiality error caused by shaft bending and shell deformation and is suitable for parts whose bearing seat holes cannot guarantee strict coaxiality. The middle bearing mainly bears the radial load, and can also bear a small amount of axial load while bearing the radial load. It is usually not used to bear the pure axial load. If it bears the pure axial load, only one row of steel balls bears the force.
(2) Deep groove ball bearings
Deep groove ball bearings are simple in structure and easy to use. They are the type of bearings with the largest production volume and the widest application range. It is mainly used to bear radial loads, and can also bear certain axial loads. When the radial clearance of the bearing increases, it has the function of an angular contact bearing and can bear a large axial load.
(3) Spherical roller bearings
Spherical roller bearings have two rows of rollers, which are mainly used to bear radial loads, and can also bear axial loads in either direction. This kind of bearing has high radial load capacity and is especially suitable for working under heavy load or vibration load, but it cannot bear pure axial load; it has good self-aligning performance and can compensate for the error of the same bearing.
(4) Angular contact ball bearings
Angular contact ball bearings have a high limit speed and can bear both longitudinal and axial loads, as well as pure axial loads. The axial load capacity is determined by the contact angle and increases with the increase of the contact angle.
(5) Cylindrical roller bearings
The rollers of cylindrical roller bearings are usually guided by two ribs of a bearing ring and the cage. The roller and the guide ring form an assembly that can be separated from the other bearing ring and is separable bearings. This kind of bearing is easy to install and disassemble, especially when it is required that the inner, and outer ring, shaft, and housing are all interference fit. Such bearings are generally only used to bear radial loads, and only single-row bearings with inner and outer rings with ribs can bear small constant axial loads or large intermittent axial loads.
(6) Thrust roller bearings
Thrust spherical roller bearings are used to bear axial and longitudinal combined loads, but the longitudinal load must not exceed 55% of the axial load. Compared with other thrust roller bearings, this kind of bearing has a lower friction coefficient, higher speed, and self-aligning ability. The rollers of the 29000-type bearings are asymmetrical spherical rollers, which can reduce the relative sliding between the stick and the raceway during work, and the rollers are long and large in diameter, and the number of rollers is large. The load capacity is large, and oil lubrication is usually used. Grease lubrication is available at low speeds. When designing and selecting, it should be preferred.
(7) Tapered roller bearings
Engine bearing factory tells you,Tapered roller bearings are mainly suitable for bearing combined radial and axial loads mainly based on radial loads, while tapered roller bearings with large taper angles can be used to bear combined radial and axial loads mainly based on axial loads. This kind of bearing is a separable bearing, its inner ring (including tapered roller and cage) and outer ring can be installed separately. During installation and use, the radial clearance and axial clearance of the bearing can be adjusted, and it can also be pre-interference installed.
(8) Thrust ball bearings
A thrust ball bearing is a separable bearing, the shaft washer, and the cage steel ball assembly can be separated. The shaft ring is a ring matching with the shaft, and the seat ring a ring matching with the bearing seat hole, and there is a gap between the shaft and the shaft.
Thrust ball bearings can only handle axial loads, one-way thrust ball bearings can only bear axial loads in one room, and two-way thrust ball bearings can bear axial loads in two directions. The thrust ball cannot limit the longitudinal movement of the shaft, and the limit speed is very low. One-way thrust ball bearings can limit the axial displacement of the shaft and housing in one direction, and two-way bearings can limit the axial displacement in two directions.
(9) Needle bearings
Needle roller bearings are equipped with thin and long rollers (the length of the rollers is 3 to 10 times the diameter, and the diameter is generally not more than 5mm), so the radial structure is compact. When the inner diameter size and load capacity are the same as other types of bearings, the outer smallest diameter is especially suitable for support structures with limited radial installation dimensions. According to different application occasions, bearings without inner rings or needle roller and cage assemblies can be selected. At this time, the journal surface and housing hole surface matched with the bearing are directly used as the inner and outer rolling surfaces of the bearing, in order to maintain the load capacity and running performance. The same as bearings with rings, the hardness, machining accuracy, and surface and surface quality of the raceway surface of the shaft or housing hole should be similar to the raceway of the bearing ring. This kind of bearing can only bear radial load.
(10) Outer spherical ball bearing with seat
The outer spherical ball bearing with seat is composed of an outer spherical ball bearing with seals on both sides and a cast (or stamped steel) bearing seat. The internal structure of the outer spherical ball bearing is the same as that of the deep groove ball bearing, but the inner ring of this kind of bearing is wider than the outer ring. The outer ring has a truncated spherical outer surface, which can be automatically aligned when matched with the concave spherical surface of the bearing seat. Usually, there is a gap between the inner hole of this kind of bearing and the shaft, and the inner ring of the bearing is fixed on the shaft with a top screw, an eccentric sleeve, or an adapter sleeve, and rotates with the shaft. Bearings with housings are compact in structure, convenient for loading and unloading and perfect for sealing. They are suitable for simple support and are often used in mining, metallurgy, agriculture, the chemical industry, textile, printing and dyeing, and conveying machinery.

3. Frictional nature of engine bearing work
(1) Sliding friction bearings (sliding bearings for short)
(1) Rolling friction bearings (referred to as rolling bearings)

4. Rolling bearing size:
(1) Miniature bearings - bearings with a nominal outer diameter of 26mm or less;
(2) Small bearings - bearings with a nominal outer diameter ranging from 28 to 55mm;
(3) Small and medium-sized bearings - bearings with a nominal outer diameter ranging from 60-115mm;
(4) Medium and large bearings - bearings with a nominal outer diameter ranging from 120-190mm
(5) Large bearings - bearings with a nominal outer diameter ranging from 200-430mm;
(6) Extra-large bearings - the nominal outer diameter ranges from 440-2000mm.
(7) Heavy-duty bearings - bearings with a nominal outer diameter of 2000mm or more.