Oil tank filler assembly and welding fixture

Abstract

The utility model relates to tooling technical field discloses an oil tank oil filler assembly and welding tool, and the oil tank oil filler assembly includes: oil tank casing, including two oil tank half shells, one of which is provided with mounting hole, and the junction of mounting hole and the outer wall of oil tank half shell is structured as a fillet; the oil filler, one end of which extends into the mounting hole, the oil filler includes the abutting portion and the necking portion that set up in proper order, the outer wall of abutting portion and fillet form the weld, and the transition surface is arranged between the inner wall of necking portion and the inner wall of abutting portion, and the transition surface is adapted to abut with one end of the tensioning mechanism, wherein the tensioning mechanism is arranged on the side of the mounting hole towards the inside of the oil tank half shell. The oil tank oil filler assembly provided by the utility model, the tensioning mechanism exerts the force towards the inside of the oil tank half shell on the oil filler through the transition surface, so that the oil filler is pressed on the oil tank half shell, and the laser beam of laser welding equipment and the wire feeding space of wire feeding mechanism can be avoided from being interfered by the tensioning mechanism.

Description

Technical Field

[0001] This utility model relates to the field of tooling technology, specifically to a fuel tank filler neck assembly and welding tooling. Background Technology

[0002] Compared to traditional car fuel tanks, hybrid vehicle fuel tanks have higher internal pressures. Therefore, hybrid vehicle fuel tanks are typically made of metal, and the filler neck, located on the fuel tank and used to fill it with fuel, is also usually made of metal. In laser welding operations between the fuel tank and the filler neck, a tight contact between the filler neck and the tank shell is required. Clamping mechanisms are usually located outside the fuel tank to press the filler neck firmly against the tank shell. However, clamping mechanisms often interfere with the incident space of the laser beam and the wire feeding mechanism, thus affecting the weld accessibility of the laser welding. Utility Model Content

[0003] In view of this, the present invention provides a fuel tank filler port assembly and welding fixture to solve the problem that clamping mechanisms often interfere with the incident space of the laser beam and wire feeding mechanism, thereby affecting the weld accessibility of laser welding.

[0004] In a first aspect, this utility model provides a fuel tank filler neck assembly, comprising:

[0005] The fuel tank shell includes two fuel tank half-shells, one of which has a mounting hole, and the junction between the mounting hole and the outer wall of the fuel tank half-shell is constructed as a rounded corner.

[0006] The filler neck extends into the mounting hole at one end, and along the direction towards the interior of the fuel tank half-shell, the filler neck includes a connecting part and a constricted part arranged in sequence. The outer wall of the connecting part and the rounded corner surface form a weld. The inner diameter of the constricted part is smaller than the inner diameter of the connecting part. A transition surface is provided between the inner wall of the constricted part and the inner wall of the connecting part. The transition surface is adapted to abut against one end of the tensioning mechanism. The tensioning mechanism is located on the side of the mounting hole facing the interior of the fuel tank half-shell, so that the filler neck has a tendency to move towards the interior of the fuel tank half-shell under the abutment action of the tensioning mechanism.

[0007] In one alternative implementation, the radius of the rounded corner is 2 mm to 4 mm.

[0008] Secondly, this utility model also provides a welding fixture for welding the filler port and the tank half-shell of the aforementioned fuel tank filler port assembly. The welding fixture includes:

[0009] The base has its main plane arranged vertically, and a support block is provided in the lower part of the main plane of the base. The support block is adapted to abut against the lower edge of the fuel tank half shell.

[0010] A tensioning mechanism is located below the mounting hole of the fuel tank half-shell. The upper end of the tensioning mechanism is adapted to extend into the fuel filler port and abut against the transition surface of the fuel filler port so as to press the fuel filler port and the fuel tank half-shell together.

[0011] Welding equipment suitable for welding seams.

[0012] In one alternative embodiment, the tensioning mechanism includes a movable rod, the upper end of which is adapted to extend into the filler port along the axial direction of the filler port. The upper end of the movable rod is provided with a receiving cavity, and a tension ball is provided in the receiving cavity. A through hole is provided on the side wall of the movable rod. The tension ball has a first state in which a portion of its area protrudes from the movable rod through the through hole, and a second state in which it retracts into the receiving cavity. The tension ball is adapted to abut against the transition surface in the first state.

[0013] In one optional embodiment, the axis of the movable rod is parallel to the axis of the filler port; the number of tension balls is multiple, and the multiple tension balls are distributed at equal intervals along the circumference of the movable rod.

[0014] In one optional embodiment, the movable rod is further provided with an axial hole that communicates with the receiving cavity. A tensioning pin is provided in the axial hole and is adapted to move axially along the axial hole to push the tensioning ball from the second state to the first state.

[0015] In one optional embodiment, a tensioning drive device is provided below the movable rod, and the lower end of the movable rod is fixedly connected to the fixed part of the tensioning drive device. The tensioning pin is fixedly connected to the movable end of the tensioning drive device to facilitate driving the tensioning pin to move.

[0016] In one alternative embodiment, the tensioning mechanism further includes a pull-down drive device, the movable end of which is connected to the fixed part of the tensioning drive device to be adapted to drive the tensioning drive device to move.

[0017] In one alternative embodiment, a pressing mechanism is further provided on the base. The pressing mechanism includes a pressing part that abuts against the oil tank half shell to press the oil tank half shell onto the base.

[0018] In one alternative implementation, a photoelectric sensor is provided on the base to detect whether there is a filler neck on the fuel tank half-shell.

[0019] The technical solution of this utility model has the following advantages:

[0020] 1. The fuel tank filler port assembly provided by this utility model uses a tensioning mechanism provided on the side of the mounting hole facing the inside of the fuel tank half shell to apply a force towards the inside of the fuel tank half shell through a transition surface, thereby pressing the filler port onto the fuel tank half shell and avoiding interference of the tensioning mechanism with the laser beam of the laser welding equipment and the wire feeding space of the wire feeding mechanism.

[0021] 2. The welding fixture provided by this utility model has the same effect as the fuel tank filler port assembly because it includes the fuel tank filler port assembly. Its beneficial effects will not be elaborated here.

[0022] 3. The welding fixture provided by this utility model distributes multiple tension balls at equal intervals along the circumference of the movable rod, so that the force of the movable rod abutting the oil filling port through the tension balls is more evenly distributed, thereby achieving the positioning of the oil filling port and preventing its displacement.

[0023] 4. The welding fixture provided by this utility model, by setting a clamping mechanism, can press the oil tank half shell onto the main plane of the base, thereby avoiding accidental movement of the oil tank half shell during the welding process and improving the welding quality. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a welding fixture and a fuel tank filler port assembly according to an embodiment of the present utility model;

[0026] Figure 2 for Figure 1 A magnified view of part A in the diagram;

[0027] Figure 3 for Figure 1 The side view showing the welding fixture and the fuel tank filler port assembly in tandem;

[0028] Figure 4 for Figure 3 Schematic diagram of the BB section;

[0029] Figure 5 for Figure 4 A magnified view of part of C;

[0030] Figure 6 for Figure 4 A cross-sectional view of the tensioning drive device and the movable rod shown;

[0031] Figure 7 for Figure 1 The diagram shows the structure of the fuel tank half-shell.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Fuel tank half-shell; 101. Mounting hole; 2. Rounded corner surface; 3. Filler port; 301. Abutment part; 302. Narrowing part; 303. Transition surface; 4. Movable rod; 401. Receiving cavity; 5. Base; 6. Support block; 7. Welding equipment; 8. Tensioning ball; 9. Axial hole; 10. Tensioning pin; 11. Tensioning drive device; 12. Pull-down drive device; 13. Clamping mechanism; 131. Clamping part; 132. Clamping drive device; 14. Pre-positioning pin; 15. Through hole; 16. Photoelectric sensor; 17. Adjusting bolt. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] The following is combined with Figures 1 to 6 The following describes embodiments of the present invention.

[0036] According to an embodiment of the present invention, in one aspect, a fuel tank filler neck assembly is provided, comprising:

[0037] The fuel tank shell includes two fuel tank half shells 1, one of which has a mounting hole 101. The junction between the mounting hole 101 and the outer wall of the fuel tank half shell 1 is constructed as a rounded corner surface 2.

[0038] The filler neck 3 extends into the mounting hole 101 at one end. Along the direction towards the inside of the fuel tank half-shell 1, the filler neck 3 includes a contact portion 301 and a constricted portion 302 arranged in sequence. The outer wall of the contact portion 301 forms a weld with the rounded corner surface 2. The inner diameter of the constricted portion 302 is smaller than the inner diameter of the contact portion 301. A transition surface 303 is provided between the inner wall of the constricted portion 302 and the inner wall of the contact portion 301. The transition surface 303 is adapted to abut against one end of the tensioning mechanism. The tensioning mechanism is located on the side of the mounting hole 101 facing the inside of the fuel tank half-shell 1, so that the filler neck 3 has a tendency to move towards the inside of the fuel tank half-shell 1 under the abutment action of the tensioning mechanism.

[0039] The welding fixture provided in this embodiment uses a tensioning mechanism located on the side of the mounting hole 101 facing the inside of the oil tank half shell 1 to apply a force toward the inside of the oil tank half shell 1 via the transition surface 303 to the oil filling port 3, thereby pressing the oil filling port 3 onto the oil tank half shell 1 and preventing the tensioning mechanism from interfering with the laser beam of the laser welding equipment and the wire feeding space of the wire feeding mechanism.

[0040] Specifically, the fuel tank shell is composed of two fuel tank half-shells 1, and a mounting hole for installing the filler neck 3 is provided on one of the fuel tank half-shells 1. One end of the filler neck 3 extends into the mounting hole, and the other end protrudes from the fuel tank half-shell 1. The outer wall of the abutting part 301 of the filler neck 3 is interference-fitted with the inner wall of the mounting hole 101. The outer wall of the abutting part 301 is adapted to form a weld with the rounded corner surface 2. The weld is performed by welding equipment to fix the filler neck 3 to the fuel tank half-shell 1.

[0041] By making the inner diameter of the constricted portion 302 smaller than the inner diameter of the abutting portion 301, a transition surface 303 is formed between the inner wall of the constricted portion 302 and the inner wall of the abutting portion 301. The transition surface 303 can be an arc-shaped surface or a straight inclined surface. The welding equipment is located outside the oil tank half-shell 1. In related technologies, a clamping mechanism is usually used outside the oil tank half-shell 1 to press the oil filling port 3 onto the oil tank half-shell 1. However, the clamping mechanism often interferes with the laser beam of the laser welding equipment and the wire feeding space of the wire feeding mechanism, affecting the accessibility of welding. The oil tank filling port assembly provided in this embodiment can be applied to a tensioning mechanism located on the side of the mounting hole 101 away from the welding equipment. By having one end of the tensioning mechanism abut against the transition surface 303, a force is applied to the oil filling port 3 towards the inside of the oil tank half-shell 1 through the transition surface 303, thereby ensuring that the oil filling port 3 is pressed onto the oil tank half-shell 1, ensuring welding quality, and avoiding interference of the tensioning mechanism with the laser beam and the wire feeding space, thus avoiding affecting the accessibility of welding.

[0042] In one embodiment, the radius of the rounded corner 2 is 2 mm to 4 mm.

[0043] According to an embodiment of the present invention, in another aspect, a welding fixture is also provided for welding the filler port 3 and the tank half-shell 1 of the above-mentioned fuel tank filler port assembly. The welding fixture includes:

[0044] The base 5 has its main plane arranged vertically, and a support block 6 is provided in the lower part of the main plane of the base 5. The support block 6 is adapted to abut against the lower edge of the oil tank half shell 1.

[0045] A tensioning mechanism is provided below the mounting hole 101 of the oil tank half shell 1. The upper end of the tensioning mechanism is adapted to extend into the oil filling port 3 and abut against the transition surface 303 of the oil filling port 3, so as to press the oil filling port 3 and the oil tank half shell 1 together.

[0046] Welding equipment 7 is suitable for welding seams.

[0047] Specifically, the base 5 is plate-shaped. When the fuel tank half-shell 1 is placed on the welding fixture, the side of the fuel tank half-shell 1 facing the other fuel tank half-shell faces the main plane of the base 5, and the mounting hole 101 is positioned upwards. The base 5 also has multiple perforations to facilitate access to the area between the inner wall of the fuel tank half-shell 1 and the base 5 after the fuel tank half-shell 1 is installed. At least one support block 6 is provided to support the fuel tank half-shell 1. The welding equipment 7 is a laser welding device. The tensioning mechanism is connected to the base 5 and located below the mounting hole 101. A first direction is defined as the direction parallel to the axis of the filler neck 3 and towards the interior of the tank half-shell 1. The upper end of the tensioning mechanism moves parallel to the first direction. After extending into the filler neck 3, the upper end of the tensioning mechanism is adapted to abut against the transition surface 303. The transition surface 303 is arc-shaped or inclined. The force exerted by the upper end of the tensioning mechanism on the transition surface 303 has a component force along the first direction, or the upper end of the tensioning mechanism has a tendency to move along the first direction, so as to apply a force along the first direction to the filler neck 3 via the transition surface 303, thereby pressing the filler neck 3 against the tank half-shell 1. Since the tensioning mechanism is located on the side of the mounting hole facing the interior of the tank half-shell 1, interference with the laser beam and wire feeding space of the welding equipment 7 can be avoided.

[0048] In one embodiment, combined Figures 4 to 6 As shown, the tensioning mechanism includes a movable rod 4. The upper end of the movable rod 4 is adapted to extend into the oil filler 3 along the axial direction of the oil filler 3. The upper end of the movable rod 4 is provided with a receiving cavity 401. A tension ball 8 is provided in the receiving cavity 401. A through hole is provided on the side wall of the movable rod 4. The tension ball 8 has a first state in which a portion of its area protrudes from the movable rod 4 through the through hole, and a second state in which it retracts into the receiving cavity 401. The tension ball 8 is adapted to abut against the transition surface 303 in the first state.

[0049] Specifically, after the upper end of the movable rod 4 extends into the filler port 3, the tension ball 8 switches from the second state to the first state. At this time, the tension ball 8 abuts against the transition surface 303 to apply a force along the first direction to the filler port 3. The side wall of the movable rod 4 has a through hole corresponding to the receiving cavity 401. In the first state, a portion of the tension ball 8 protrudes through the through hole and into the side wall of the movable rod 4.

[0050] In one embodiment, combined Figure 5 and Figure 6 As shown, the axis of the movable rod 4 is parallel to the axis of the oil filling port 3, and there are multiple tension balls 8, which are distributed at equal intervals along the circumference of the movable rod 4.

[0051] The welding fixture provided in this embodiment distributes multiple tension balls 8 at equal intervals along the circumference of the movable rod 4, so that the force of the movable rod 4 abutting against the oil filling port 3 through the tension balls 8 is more evenly distributed, thereby achieving the positioning of the oil filling port 3 and preventing it from shifting.

[0052] Specifically, when the multiple tensioning balls 8 are in the first state and abut against the transition surface 303, the force exerted by the tensioning balls 8 on the transition surface 303 has a component force along the first direction and a component force along the radial direction of the filler port 3. Since the multiple tensioning balls 8 are distributed at equal intervals along the circumference of the movable rod 4, the axis of the filler port 3 is made to coincide with the axis of the movable rod 4. Since the filler port 3 is interference-fitted with the mounting hole 101, the oil tank half shell 1 is tightened to the position where the axis of its mounting hole 101 coincides with the axis of the movable rod 4, thereby achieving accurate positioning of the weld between the filler port 3 and the mounting hole 101.

[0053] Combination Figure 4 and Figure 7 As shown, a pre-positioning pin 14 is provided on the base 5. The axis of the pre-positioning pin 14 is perpendicular to the main plane of the base 5. A through hole 15 is provided on the fuel tank half-shell 1. The outer diameter of the pre-positioning pin 14 is smaller than the inner diameter of the through hole 15. The pre-positioning pin 14 is adapted to pass through the through hole 15 to assist in positioning the fuel tank half-shell 1. During the process of multiple tensioning balls 8 abutting against the transition surface 303 to tighten the mounting hole 101 and the filler port 3 to the welding position, the fuel tank half-shell 1 may move to a certain extent. Since the outer diameter of the pre-positioning pin 14 is smaller than the inner diameter of the through hole 15, space is reserved for the movement of the fuel tank half-shell 1. The pre-positioning pin 14 is detachably connected to the base 5 to adjust the position of the pre-positioning pin 14 on the base 5 according to different specifications of fuel tank half-shell 1.

[0054] In one embodiment, combined Figure 6 As shown, the movable rod 4 also has an axial hole 9 inside, which communicates with the accommodating cavity 401. A tensioning pin 10 is provided in the axial hole 9. The tensioning pin 10 is adapted to move along the axial direction of the axial hole 9 to push the tensioning ball 8 from the second state to the first state.

[0055] Specifically, the axis of the axial hole 9 coincides with the axis of the movable rod 4, as one possible implementation, such as... Figure 6As shown, the outer peripheral wall of the tensioning pin 10 is stepped, and the outer diameter of the stepped platform of the tensioning pin 10 decreases along the direction towards the receiving cavity 401. Therefore, as the tensioning pin 10 gradually extends into the receiving cavity 401, the outer diameter of the stepped platform in contact with the tensioning ball 8 increases, thereby pushing the tensioning ball 8 from the second state to the first state. The connection between two adjacent stepped platforms is constructed as an arc-shaped transition surface or a sloped transition surface. As an additional embodiment, the outer peripheral wall of the tensioning pin 10 is conical. As the tensioning pin 10 gradually extends into the receiving cavity 401, the outer diameter of the contact area between the tensioning pin 10 and the tensioning ball 8 gradually increases, thereby pushing the tensioning ball 8 from the second state to the first state. Conversely, as the tensioning pin 10 moves in the direction of exiting the accommodating cavity 401, the outer diameter of the contact area between the tensioning pin 10 and the tensioning ball 8 tends to decrease, so that the tensioning ball 8 can return from the first state to the second state. For example, when the movable rod 4 is pulled out from the oil filling port 3, the tensioning ball 8 returns to the accommodating cavity 401 under the abutment of the inner wall of the oil filling port 3.

[0056] In one embodiment, combined Figure 4 and Figure 6 As shown, a tensioning drive device 11 is provided below the movable rod 4, and the lower end of the movable rod 4 is fixedly connected to the fixed part of the tensioning drive device 11. The movable end of the tensioning drive device 11 is fixedly connected to the tensioning pin 10 to facilitate driving the tensioning pin 10 to move.

[0057] Specifically, the tensioning drive device 11 includes a pneumatic cylinder, a hydraulic cylinder, or an electric cylinder. It is understood that the cylinder body of the pneumatic, hydraulic, or electric cylinder serves as a fixed part, and the telescopic rod of the pneumatic, hydraulic, or electric cylinder serves as a movable end. Under the drive of the tensioning drive device 11, the tensioning pin 10 moves within the axial hole 9 in the direction of extending into or out of the receiving cavity 401, so as to facilitate the switching of the tensioning ball 8 between a first state and a second state.

[0058] In one embodiment, combined Figure 4 As shown, the tensioning mechanism also includes a pull-down drive device 12, the movable end of which is connected to the fixed part of the tensioning drive device 11, so as to drive the movable rod 4 to move axially along the oil filling port 3.

[0059] Specifically, the pull-down drive device 12 includes a pneumatic cylinder, a hydraulic cylinder, or an electric cylinder. It is understood that the cylinder body of the pneumatic, hydraulic, or electric cylinder serves as a fixed part, and the telescopic rod of the pneumatic, hydraulic, or electric cylinder serves as a movable end. Driven by the pull-down drive device 12, the tension drive device 11 causes the movable rod 4 to extend into or retract from the filler port 3.

[0060] In one embodiment, combined Figure 1 and Figure 2As shown, a pressing mechanism 13 is also provided on the base 5. The pressing mechanism 13 includes a pressing part 131, which abuts against the oil tank half shell 1 to press the oil tank half shell 1 onto the base 5.

[0061] The welding fixture provided in this embodiment, by setting a clamping mechanism 13, can press the oil tank half shell 1 onto the main plane of the base 5, thereby preventing the oil tank half shell 1 from moving unexpectedly during the welding process, which is beneficial to improving the welding quality.

[0062] Specifically, the clamping mechanism 13 further includes a clamping drive device 132, which includes a fixed part and a movable end. The fixed part of the clamping drive device 132 is detachably fixedly connected to the base 5 to facilitate adjustment of the position of the clamping mechanism 13 on the base 5 according to the specifications of the oil tank half-shell 1. The movable end of the clamping drive device 132 is adapted to move in a direction perpendicular to the main plane of the base 5, and the clamping part 131 is rotatably connected to the movable end of the clamping drive device 132. In the direction perpendicular to the main plane of the base 5, the clamping part 131 has a third state in which its projection does not overlap with the oil tank half-shell 1, and a fourth state in which its projection at least partially falls on the oil tank half-shell 1. The clamping drive device 132 includes a cylinder, a hydraulic cylinder, or an electric cylinder. It is understood that the cylinder body of the cylinder, hydraulic cylinder, or electric cylinder serves as the fixed part, and the telescopic rod of the cylinder, hydraulic cylinder, or electric cylinder serves as the movable end. The clamping part 131 includes a strip rod or a bent rod, combined with... Figure 2 As shown, taking a bar as an example, one end of the bar is rotatably connected to the movable end of the pressing drive device 132. The rotation plane of the bar is parallel to the main plane of the base 5. The bar is adapted to abut against the side of the oil tank half-shell 1 away from the base 5, so as to press the oil tank half-shell 1 onto the base 5. Furthermore, an adjusting bolt 17 is provided at the end of the bar away from the movable end of the pressing drive device 132. The axis of the adjusting bolt 17 is perpendicular to the main plane of the base 5. The bar abuts against the oil tank half-shell 1 through the end of the adjusting bolt 17. By rotating the adjusting bolt 17, the position of the adjusting bolt 17 on the bar can be adjusted. The number of pressing mechanisms 13 is at least one.

[0063] First, rotate the clamping part 131 to the third state, thereby making room for the installation of the oil tank half shell 1 on the base 5. The upper end of the movable rod 4 extends into the oil filling port 3, and the tension ball 8 is adjusted to the first state and abuts against the transition surface 303. After the oil tank half shell 1 is adjusted into place, the clamping drive device 132 drives the clamping part 131 away from the base 5 until it moves to a position where the clamping part 131 can be rotated to the fourth state. At this time, the clamping part 131 is rotated to the fourth state, and the clamping drive device 132 drives the clamping part 131 closer to the base 5 until the clamping part 131 abuts against the oil tank half shell 1, or abuts against the oil tank half shell 1 through the adjusting bolt 17.

[0064] In one embodiment, as shown in the figure, a photoelectric sensor 16 is provided on the base 5 to detect whether there is a filler port 3 on the oil tank half shell 1.

[0065] Specifically, the photoelectric sensor 16 is positioned near the mounting hole 101 to detect whether an oil filler port 3 is placed on the mounting hole 101.

[0066] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations fall within the scope defined by the present invention.

Claims

1. A fuel tank filler neck assembly, characterized in that, include: The fuel tank shell includes two fuel tank half shells (1), one of which has a mounting hole (101) and the junction of the mounting hole (101) and the outer wall of the fuel tank half shell (1) is constructed as a rounded corner surface (2). The filler port (3) extends into the mounting hole (101) at one end, and faces the interior of the fuel tank half shell (1). The filler port (3) includes a contact portion (301) and a constricted portion (302) arranged in sequence. The outer wall of the contact portion (301) forms a weld with the rounded corner surface (2). The inner diameter of the constricted portion (302) is smaller than the inner diameter of the contact portion (301). A transition surface (303) is provided between the inner wall of the constricted portion (302) and the inner wall of the contact portion (301). The transition surface (303) is adapted to abut against one end of the tensioning mechanism. The tensioning mechanism is located on the side of the mounting hole (101) facing the interior of the fuel tank half shell (1) so that the filler port (3) tends to move towards the interior of the fuel tank half shell (1) under the abutment action of the tensioning mechanism.

2. The fuel tank filler neck assembly according to claim 1, characterized in that, The radius of the rounded corner (2) is 2 mm to 4 mm.

3. A welding fixture, characterized in that, For welding the fuel filler port (3) and the fuel tank half-shell (1) of the fuel tank filler port assembly according to any one of claims 1 to 2, the welding fixture includes: The base (5) has its main plane arranged vertically, and a support block (6) is provided in the lower part of the main plane of the base (5). The support block (6) is adapted to abut against the lower edge of the oil tank half shell (1). A tensioning mechanism is provided below the mounting hole (101) of the oil tank half shell (1). The upper end of the tensioning mechanism is adapted to extend into the oil filling port (3) and abut against the transition surface (303) of the oil filling port (3) so that the oil filling port (3) and the oil tank half shell (1) are pressed together. Welding equipment (7) is suitable for welding seams.

4. The welding fixture according to claim 3, characterized in that, The tensioning mechanism includes a movable rod (4), the upper end of which is adapted to extend into the oil filler port (3) along the axial direction. The upper end of the movable rod (4) is provided with a receiving cavity (401), and a tension ball (8) is provided in the receiving cavity (401). The side wall of the movable rod (4) is provided with a through hole. The tension ball (8) has a first state in which a portion of its area protrudes from the movable rod (4) through the through hole, and a second state in which it retracts into the receiving cavity (401). The tension ball (8) is adapted to abut against the transition surface (303) in the first state.

5. The welding fixture according to claim 4, characterized in that, The axial direction of the movable rod (4) is parallel to the axial direction of the oil filling port (3); there are multiple tension balls (8), and the multiple tension balls (8) are distributed at equal intervals along the circumference of the movable rod (4).

6. The welding fixture according to claim 4, characterized in that, The movable rod (4) is also provided with an axial hole (9) and communicates with the accommodating cavity (401). A tensioning pin (10) is provided in the axial hole (9). The tensioning pin (10) is adapted to move along the axial direction of the axial hole (9) to push the tensioning ball (8) from the second state to the first state.

7. The welding fixture according to claim 6, characterized in that, A tensioning drive device (11) is provided below the movable rod (4), and the lower end of the movable rod (4) is fixedly connected to the fixed part of the tensioning drive device (11). The tensioning pin (10) is fixedly connected to the movable end of the tensioning drive device (11) to facilitate driving the tensioning pin (10) to move.

8. The welding fixture according to claim 7, characterized in that, The tensioning mechanism further includes a pull-down drive device (12), the movable end of which is connected to the fixed part of the tensioning drive device (11) to drive the tensioning drive device (11) to move.

9. The welding fixture according to any one of claims 3 to 8, characterized in that, The base (5) is also provided with a pressing mechanism (13), which includes a pressing part (131) that abuts against the oil tank half shell (1) to press the oil tank half shell (1) onto the base (5).

10. The welding fixture according to any one of claims 3 to 8, characterized in that, A photoelectric sensor (16) is provided on the base (5) to detect whether there is a filler port (3) on the oil tank half shell (1).

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