Automobile fuel tank nut cover assembly method

Abstract

The invention relates to the field of automobile plastic fuel tanks, in particular to an automobile fuel tank nut cover assembly method. The automobile fuel tank nut cover assembly method is characterized by sequentially comprising the following steps that A), a fuel tank body (2) is placed on an assembly fixture; B), a sealing ring and an oil pump are installed in order, a nut cover (3) is installed on the fuel tank body (2); C), the nut cover (3) is rotated clockwise with the hand from a fuel tank thread starting point (1), and a nut cover assembly arrow (5) is aligned at a nut assembly start mark (4); D), the nut cover (3) is sleeved with a special sleeve of an electric torque wrench tool with the set angle, and then an electric torque wrench is started to conduct automation rotation; and E), when the nut cover assembly arrow (5) is automatically rotated to a nut arrow end point area formed by a nut assembly final end mark (6) controlled by the torque and the angle on the fuel tankbody (2), the torque value of the nut cover (3) at the time is obtained and is compared with the set torque force range, and if the torque value exceeds the range, the part size is out of tolerance. After adopting the method, the mounting precision of the nut cover on the fuel tank body is high.

Description

technical field [0001] The invention relates to the field of manufacturing automobile plastic fuel tanks, in particular to an assembly method for a nut cover of the automobile fuel tank. Background technique [0002] In the installation production process of the existing oil tank nut cover, the installation definition of the oil pump nut adopts "torque force" to control the compression amount of the oil pump sealing ring. The amount of compression is the key to the sealing of the automotive oil pump. This process has the following factors that affect the assembly accuracy of parts: such as dimensional tolerance fit (referring to the upper and lower tolerance assembly of two parts), seasonal factors (referring to the processing characteristics of plastics, plastics are hardened in winter, and high-temperature plastics are softened in summer), When the existing "torque force" assembly is used, the nut cover will have different rotation angles, and the starting thread of the o...

AI Technical Summary

Problems solved by technology

This process has the following factors that affect the assembly accuracy of parts: such as dimensional tolerance fit (referring to the upper and lower tolerance assembly of two parts), seasonal factors (referring to the processing characteristics of plastics, plastics are hardened in winter, and high-temperature plastics are softened in summer), When the existing "torque force" assembly is used, the nut cover will have different rotation angles, and the starting thread of the oil tank and the nut is defined and solidified, so different angles will produce different compressions on the oil pump sealing ring of the oil tank, and the sealing The amount of compression of the ring is directly related to whether the fuel tank is leaking

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