Spring washers are also a typical locking device. Unloaded or misplaced can seriously affect the reliability and life of the machine. If the engine fan fixing screw is not loosened with a spring washer, the loose fan blade will scrape the cooling water tank, and the blade itself will also scrap the drive shaft below the tightening nut. If you forget to add the anti-loose spring washer, it is likely to cause the car to turn over. A major accident that killed people. Control of the original performance state of the threaded fastener The so-called control of the original performance state of the fastener mainly means that the type, assembly position and mechanical properties of the threaded fastener specified by the original design are not changed during the maintenance. It is said that maintaining the type of threaded fasteners by fasteners to achieve detachable connection of components is an important measure to enhance mechanical maintainability. There are many types of fasteners to meet different functional requirements. A common problem in maintenance is the lack of differentiation of fasteners. After disassembly, it is not classified and stored, but thrown casually, or worn after being damaged, or replaced at will, thus adversely affecting the progress or reliability of repair. Those who do not pay attention to distinguish the type of thread during assembly, blindly match. If many aluminum alloy parts are scrapped during maintenance, it is caused by the fact that the relevant personnel use the steel bolts with the same thickness but different tooth shape to push hard into the screw holes of the aluminum alloy parts. The thread of the screw hole has been broken. In many cases, such damage is inconvenient to repair or cannot be repaired, and it has to be repaired or replaced in a more dog-like range. Even if it is repaired such as reaming, tapping, etc., it is bound to reduce the reliability and life of the components. Therefore, it is important to carefully distinguish the type of fasteners in maintenance. Standard metric metric threaded fasteners, sub-bolts, studs and screws, each with coarse and fine teeth. Bolts are widely used. Where some bolts cannot be connected, stud bolts are widely used, such as cylinder head bolts and half shaft bolts. Coarse-toothed bolts or screws are generally used for fastening non-movable common members. They are used for critical parts of motion that are subject to large stresses, such as connecting rods and drive shaft bolts. The fastening between the thin-walled attachment and the main part, such as the connection of the clutch cover to the flywheel.
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