Working cycle: The conversion of thermal and mechanical energy of the internal combustion engine through the piston in the cylinder, continuous intake, compression, power and exhaust processes. The process of each machine is called a work cycle.
Piston stroke: The minimum linear distance between the upper and lower dead centers is called the stroke of the piston (or the stroke of the piston). The minimum linear distance between the center of the connection between the crankshaft and the big end of the connecting rod to the center of rotation of the crankshaft is called the rotation of the crank. radius.
Top dead center and bottom dead center: When the piston moves in the cylinder, the highest point is called top dead center (or top dead center), and the lowest is called bottom dead center.
Working volume: The piston moves from top dead center to the next point, called cylinder volume (piston displacement).
Compression ratio: air fills the cylinder, the total volume occupied by the cylinder will occupy the total cylinder volume. The larger the gas compression ratio, the more the gas is compressed when the piston moves, and the higher the temperature and pressure of the gas, the internal combustion engine. The efficiency is also higher.
NSK manufacture a full range of deep groove ball bearings. These bearings are the most common type and are used in a wide variety of applications.
Single-Row Deep Groove Ball Bearings
Pressed Steel Cages
Single-row deep groove ball bearings are the most common type of rolling bearings. Their use is very widespread.
In addition to open type bearings, these bearings often have steel shields or rubber seals installed on one or both sides and are prelubricated with grease. Also, snap rings are sometimes used on the periphery. As to cages, pressed steel ones are the most common.
For big deep groove ball bearings, machined brass cages are used.
Machined cages are also used for high speed applications.
Extra Small Ball Bearings and Miniature Ball Bearings
Miniature and instrument ball bearings can be divided into two basic types, deep groove and angular contact. The first (deep groove) can be further divided into the following five classes depending on their design details:
Standard type
Flanged outer ring
Extended inner ring
Expanded type in which one ring has a radial thickness that is larger than normal compared with the bearing width.
Thin section type in which both rings are extra thin in the radial direction. They can also be classified as: open, shielded, or sealed.
Maximum-Type Ball Bearings
Maximum-Type ball Bearings contain a larger number of balls than normal deep groove ball bearings because of filling slots in the inner and outer rings. Because of their filling slots, they are not suitable for applications with high axial loads. types of bearings have boundary dimensions equal to those of single-row deep groove ball bearings of Series 6200 and 6300 respectively. Besides the open type, ZZ type shielded bearings are also available. When using these bearings, it is important for the filling slot in the outer ring to be outside of the loaded zone as much as possible. Their cages are pressed steel.
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Shijiazhuang Longshu Mechanical & Electrical Equipment Trading Co., Ltd. , https://www.longsbearings.com