The engine is a machine which can convert other forms of energy into mechanical energy, such as internal combustion engine, external combustion engine and electric motor. The Kaichuang spring machine of Li manager reminder that engine compression spring role is to use the tension clutch and clutch disc tightly against the wheel, the power of the engine will be reliably transmitted to the transmission system, to other forms of energy more efficiently into mechanical energy. For the application of the engine indispensable pressure spring, its quality parameters are as follows:
 
  ⑴Appearance quality requirements. The surface quality of spring products is smooth, without cracks, oxidation and rust. In addition, in the use of spring machine coiling process doesn't allow the depth of the material more than 1/2 of the depth of the material diameter of individual indentation, pits and scratches and other phenomena.
 
  ⑵Material selection requirements. Spring material is usually 65Mn steel wire or I, II carbon spring steel wire.
 
  ⑶Hardness control requirements. After quenching and tempering treatment of cold coil spring, the hardness value should be in the range of 44 ~ 52HRC, in addition to the special case of the hardness value can be extended to select the range of 55HRC.
  
  ⑷Processing density requirements. Spring pressure calculation method of processing density requirements to compression spring support ring down part ends and circle and removed the circumference of not less than 3/4, the thickness of both ends of the wire diameter is generally not less than 1/8; according to the application requirements, you can check the spring pitch uniformity, such as tolerance for spacing of 10%, the minimum value of tolerance General tolerances for 0.3mm; the pressure spring and the spring ring at both ends of the axial line of the verticality of 2.5% free height, minimum tolerances for 1.0mm; straightness of the pressure spring axis for perpendicularity tolerance of 1/2; the spring by the surface roughness should not be less than 12.5 μm.