CN102744557A

CN102744557A - Assembly method for screw nut cover of automobile oil tank

Info

Publication number: CN102744557A
Application number: CN2012102138214A
Authority: CN
Inventors: 屈新国; 陈小峰
Original assignee: WUHAN YAPP AUTOMOTIVE PLASTIC PARTS CO Ltd
Current assignee: WUHAN YAPP AUTOMOTIVE PLASTIC PARTS CO Ltd
Priority date: 2012-06-27
Filing date: 2012-06-27
Publication date: 2012-10-24

Abstract

The invention relates to the field of plastic oil tanks for an automobile, in particular to an assembly method for a screw nut cover of an automobile oil tank. The method is characterized by sequentially comprising the following steps that A), an oil tank body (2) is placed on an assembly clamp; B), a sealing ring and an oil pump are sequentially installed, and then, the screw nut cover (3) is arranged on the oil tank body (2); C), the screw nut cover (3) is clockwise rotated by hand from an oil tank screw thread starring point (1), and a screw nut cover assembly arrow (5) is aligned with a screw nut assembly starting mark (4); D), a special sleeve for an electric torque spanner tooling after the angle setting is sheathed on the screw nut cap (3), and then, the electric torque spanner is started for carrying out automatic rotation; E), when the screw nut cover assembly arrow (5) is automatically rotated to a screw nut arrow terminal point region on the oil tank body (2) formed by a screw nut assembly terminal point mark (6)controlled by the torque and angle, the torque value of the screw nut cover (3) at the time is determined, in addition, the torque value is compared with the set torque force range, and the part dimension is out of tolerance when the torque value exceeds to the range. After the method is adopted, the installing precision of the screw nut cover on the oil tank body is higher.

Description

Automotive oil tank nut cap assembly method

Technical field

The present invention relates to the automobile plastic fuel tank and make field, especially automotive oil tank nut cap assembly method.

Background technology

In the installation production technology of existing fuel tank nut cap, the oil pump nut is installed the decrement that " torsional forces " control oil pump sealing ring is adopted in definition.And decrement is the key of automobile fuel pump sealing.There is the following factor that influences the part assembly precision in this technology: cooperate (referring to the assembling of tolerance up and down of two parts), seasonal factor (to refer to the processing of plastic characteristic such as dimensional tolerance; Sclerosis of plastics in the winter time; And the summer high-temperature plastics are more softening); When adopting existing " torsional forces " assembling can cause nut to be stamped the different rotary angle; And fuel tank and nut start screw threads to be definition solidify, so different angles can produce the different compression amount to the oil pump sealing ring of fuel tank, and the decrement of sealing ring is directly connected to whether leakage of oil of fuel tank.

Summary of the invention

In order to address the above problem, the invention provides a kind of automotive oil tank nut cap assembly method, the installation accuracy of its nut cap on the fuel tank body is higher.

Technical scheme of the present invention is: automotive oil tank nut cap assembly method, and its difference is: steps A), the fuel tank body is placed on the assembling jig;

Step B), sealing ring, oil pump installed in order after, again nut cap is installed on the fuel tank body;

Step C), with hand nut cap is turned clockwise, nut cap is assembled arrow alignment nut assembling start mark from the fuel tank screw thread starting point;

Step D), be enclosed within on the nut cap, begin to start the electric twisting wrench then and rotate automatically with the electric twisting wrench frock of set angle is special-purpose;

Step e), when nut assembling arrow rotates on the fuel tank body nut arrow land that the nut assembling terminal point mark by moment of torsion and angle control constitutes automatically; Confirm the nut cap torque value of this moment; And with set the torsional forces scope relatively, as overrun that then the accessory size tolerance is overproof.

Useful technique effect of the present invention: 1, adopt the method to control oil pump sealing ring decrement effectively to accessory size tolerance and adverse product qualities that season, reason was brought;

2, prevent to cause operating personnel to judge by accident because of " torsional forces " control;

3, the decrement of assurance fuel tank oil pump sealing ring can require keep consistency according to Product Definition effectively;

4, prevent the traffic safety and the personal safety that bring because of the automotive oil tank leakage of oil.

Description of drawings

Fig. 1 is the partial structurtes sketch map of embodiment of the invention automotive oil tank.

The specific embodiment

Further specify the specific embodiment of the invention below in conjunction with accompanying drawing.

As shown in Figure 1, embodiment of the invention automotive oil tank nut cap assembly method, its difference is: steps A), fuel tank body 2 is placed on the assembling jig;

Step B), sealing ring, oil pump installed in order after, again nut cap 3 is installed on the fuel tank body 2;

Step C), nut cap 3 is turned clockwise, nut cap is assembled arrow 5 alignment nuts assembling start marks 4 from fuel tank screw thread starting point 1 usefulness hand;

Step D), be enclosed within on the nut cap 3, begin to start the electric twisting wrench then and rotate automatically with the electric twisting wrench frock of set angle is special-purpose;

Step e), when nut assembling arrow 5 rotates on the fuel tank body 2 the nut arrow land that the nut assembling terminal point mark 6 by moment of torsion and angle control constitutes automatically; The assembly crewman can identify in the relevant position on the fuel tank body 2 of nut arrow indication; And definite nut cap 3 torque value at this moment; And with set the torsional forces scope relatively, as overrun that then the accessory size tolerance is overproof.

Concrete, the breast the tape angular range of mark 6 of nut assembling start mark 4 is 195 degree-225 degree, and median is 210 degree.Preferably, the breast the tape angular range of mark 6 of nut assembling start mark 4 is 205 degree-215 degree, and median is 210 degree.

The above; It only is the preferred embodiment of this invention; Be not that any pro forma restriction is done in invention, every foundation technical spirit of the present invention all still belongs in the scope of the present invention any simple modification, equivalent variations and modification that above embodiment did.

Claims

1. automotive oil tank nut cap assembly method, it is characterized in that: it may further comprise the steps successively:

Steps A), fuel tank body (2) is placed on the assembling jig;

Step B), sealing ring, oil pump installed in order after, again nut cap (3) is installed on the fuel tank body (2);

Step C), with hand nut cap (3) is turned clockwise, nut cap is assembled arrow (5) alignment nut assembling start mark (4) from fuel tank screw thread starting point (1);

Step D), be enclosed within on the nut cap (3), begin to start the electric twisting wrench then and rotate automatically with the electric twisting wrench frock of set angle is special-purpose;

Step e), rotate to fuel tank body (2) automatically when going up the nut arrow land that the nut assembling terminal point mark (6) by moment of torsion and angle control constitutes when nut assembling arrow (5); Confirm nut cap (3) torque value of this moment; And with set the torsional forces scope relatively, as overrun that then the accessory size tolerance is overproof.