Single cylinder diesel engine oil tank oil outlet seat fastening structure

Abstract

This utility model discloses a fastening structure for the fuel tank outlet seat of a single-cylinder diesel engine, including a fuel outlet pipe. The upper end of the fuel outlet pipe has an integrally formed, annular welding boss. The welding boss is welded to the fuel outlet seat of the fuel tank. The fuel outlet seat has an fuel outlet. A welding groove is provided around the fuel outlet on the fuel outlet seat, which mates with the welding boss. The bottom surface of the welding boss has at least two positioning stops. A positioning block mates with the positioning stops is provided in the welding groove. The lower part of the fuel outlet pipe has an integral connecting part with a diameter smaller than that of the fuel outlet pipe. The connecting part extends from the fuel outlet to the outside of the fuel tank. The welding boss is welded into the welding groove, and the positioning block is embedded in the positioning stops to prevent the fuel outlet pipe from rotating. The cooperation of the positioning stops and positioning blocks prevents skewing during welding. After welding, a mechanical interlock is formed, effectively preventing the fuel outlet pipe from rotating during the installation and disassembly of the fuel pipe joint.

Description

Technical Field

[0001] This utility model relates to the field of fuel tank technology, specifically a fastening structure for the fuel tank outlet seat of a single-cylinder diesel engine. Background Technology

[0002] Single-cylinder diesel engines are widely used in agricultural machinery, small construction machinery, and small power generation equipment due to their simple structure, low price, and easy maintenance. The fuel tank is an important component of the diesel engine's fuel supply system, and its fuel outlet is typically connected to the fuel line connector via a welded nut. Currently, common fuel outlet welded nuts are mostly ordinary hexagonal nuts or flange nuts, fixed to the fuel tank wall (usually the fuel outlet mounting location) by spot welding or projection welding.

[0003] like Figure 4 As shown, this traditional welded nut structure has the following drawbacks in practical use: (1) Poor sealing. The nut is directly welded to the bottom wall of the oil outlet. There may be problems such as incomplete welding, burn-through or discontinuous welding at the welding point, which will cause fuel leakage in the fuel tank under long-term vibration environment, which not only causes waste, but also poses a serious safety hazard.

[0004] (2) Insufficient connection strength. The welding contact area of ​​ordinary nuts is limited. When subjected to the tightening force of the oil pipe joint and the continuous vibration of the diesel engine during operation, the welding point is prone to fatigue cracking, which leads to the nut loosening or even falling off.

[0005] (3) Low positioning accuracy. Ordinary nuts are prone to skew during the welding process, making welding difficult.

[0006] (4) Weak torsional resistance. When installing and disassembling the oil pipe joint, the torque acting on the nut can easily cause it to rotate relative to the tank wall, damaging the weld joint. Utility Model Content

[0007] To address the shortcomings of existing technologies, this utility model provides a welded nut structure for the oil tank outlet seat of a single-cylinder diesel engine, which features a reasonable structure, good sealing performance, high connection strength, accurate positioning, and strong torsional resistance.

[0008] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A fastening structure for the fuel tank outlet seat of a single-cylinder diesel engine includes a fuel outlet pipe. The upper end of the fuel outlet pipe has an integrally formed, annular welding boss. The welding boss is welded to the fuel outlet seat of the fuel tank. The fuel outlet seat has an outlet port. A welding groove is provided around the outlet port on the fuel outlet seat, cooperating with the welding boss. The bottom surface of the welding boss has at least two positioning stops. A positioning block is provided in the welding groove, cooperating with the positioning stops. The lower part of the fuel outlet pipe has an integral connecting part. The diameter of the connecting part is smaller than the diameter of the fuel outlet pipe. The connecting part extends from the outlet port to the outside of the fuel tank. The welding boss is welded into the welding groove, and the positioning block is embedded in the positioning stops to prevent the fuel outlet pipe from rotating.

[0009] Preferably, the inner wall of the oil outlet pipe is provided with multiple threaded openings with gradually decreasing inner diameters from top to bottom. Different diameter threaded openings can connect to oil pipe fittings of different diameters, improving installation adaptability.

[0010] Preferably, each of the threaded openings is provided with a first sealing ring at its lower part. The first sealing ring can improve the sealing performance of the connection between the oil pipe joint and the oil outlet pipe.

[0011] Preferably, a second sealing ring is provided on the bottom surface of the welding groove near the oil outlet. The second sealing ring can improve the sealing performance between the oil outlet pipe and the oil outlet seat.

[0012] Preferably, a fastening nut is threaded onto the connecting part, and the fastening nut is tightened to press it tightly against the bottom surface of the oil outlet seat. After the oil outlet pipe is welded to the oil outlet seat, the fastening nut is tightened upwards to press it tightly against the bottom surface of the oil outlet seat, which can further fix the oil outlet pipe.

[0013] Compared with the prior art, the beneficial effects of this utility model are: (1) By setting an annular welding boss, the welding part changes from the traditional point or line contact to a continuous annular surface contact. During welding, the solder melts and fills the entire annular welding surface, forming a complete sealing ring, which fundamentally eliminates the possibility of fuel leakage from the weld gap and significantly improves the sealing performance.

[0014] (2) The annular welding boss greatly increases the welding area and weld depth between the nut and the oil tank outlet seat, making the welded connection more robust. It can effectively withstand the tightening force of the oil pipe joint and the vibration load during diesel engine operation, preventing the weld point from cracking and the nut from loosening.

[0015] (3) By cooperating with the positioning stop and the positioning block, the oil outlet pipe can be quickly and accurately positioned before welding to prevent skewing during welding. After welding, a mechanical interlock can be formed to effectively prevent the oil outlet pipe from rotating during the installation and disassembly of the oil pipe joint, and protect the weld from being damaged by torque. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the present invention; Figure 2 for Figure 1 A magnified view of a portion of the image; Figure 3 This is a breakdown diagram of the oil outlet pipe and oil outlet seat. Figure 4 This is a schematic diagram of the current fuel tank. In the diagram: 1-oil outlet pipe, 2-welding boss, 3-oil outlet seat, 4-welding groove, 5-positioning stop, 6-positioning block, 7-connecting part, 8-threaded port, 9-first sealing ring, 10-second sealing ring, 11-fastening nut, 12-oil tank. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1-3 A fastening structure for the fuel tank outlet seat of a single-cylinder diesel engine includes a fuel outlet pipe 1. The upper end of the fuel outlet pipe 1 has an integrally formed, annular welding boss 2, the bottom surface of which is a flat welding surface. A fuel outlet port is provided at the fuel outlet seat 3. A welding groove 4, which mates with the welding boss, is provided around the fuel outlet port on the fuel outlet seat 3. At least two positioning stops 5 are provided on the bottom surface of the welding boss 2. Positioning blocks 6, which mate with the positioning stops 5, are provided within the welding groove 4. The welding boss 2 is welded into the welding groove 4, and the positioning blocks 6 are embedded within the positioning stops 5. Through the cooperation of the positioning stops 5 and the positioning blocks 6, the fuel outlet pipe 1 can be quickly and accurately positioned before welding, preventing skewing during welding. After welding, a mechanical interlock is formed, effectively preventing the fuel outlet pipe 1 from rotating during the installation and disassembly of the fuel pipe joint, protecting the weld from torsional damage.

[0019] The thickness of the oil outlet seat 3 is preferably 8mm to 10mm, the thickness of the welding boss 2 is preferably 3mm to 5mm, and the depth of the welding groove 4 matches the depth of the welding boss 2. The depth of the positioning stop 5 is preferably 1-2mm, and the size of the positioning block 6 matches the size of the positioning stop 5.

[0020] The lower part of the oil outlet pipe 1 is provided with an integral connecting part 7. The diameter of the connecting part 7 is smaller than the diameter of the oil outlet pipe 1. The connecting part 7 extends out of the oil outlet and extends to the outside of the oil tank. A fastening nut 11 is threaded onto the connecting part 7. The fastening nut is a hexagonal nut. Tightening the fastening nut 11 makes it press tightly against the bottom surface of the oil outlet seat 3 to limit the oil outlet pipe 1. Combined with the effect of the welding surface, a double fastening is achieved, thereby further fixing the oil outlet pipe 1.

[0021] The inner wall of the oil outlet pipe 1 is provided with multiple threaded openings 8 with gradually decreasing inner diameters from top to bottom. The threaded openings 8 of different diameters can be connected to oil pipe fittings of different diameters, improving the adaptability of the installation.

[0022] Each of the aforementioned threaded openings 8 is provided with a first sealing ring 9 at its lower part. The first sealing ring 9 improves the sealing performance of the connection between the oil pipe joint and the oil outlet pipe.

[0023] A second sealing ring 10 is provided on the bottom surface of the welding groove 4 near the oil outlet. The second sealing ring 10 improves the sealing performance between the oil outlet pipe and the oil outlet seat.

[0024] The welding method of this utility model is as follows: Insert the oil outlet pipe 1 into the oil outlet hole from inside the oil tank 12, so that the welding boss 2 covers the welding groove 4, and at the same time, the positioning stop 5 is locked on the positioning block 6. Then, weld the welding boss 3 into the welding groove 4. Next, install the fastening nut 11 on the connecting part 7, so that it is pressed tightly against the bottom of the oil outlet seat 3, thereby completing the welding and installation of the oil outlet pipe 1.

[0025] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A single cylinder diesel engine oil tank oil outlet base fastening structure characterized by: The system includes an oil outlet pipe (1), the upper end of which is provided with an integrally formed and annular welding boss (2); the welding boss (2) is welded to the oil outlet seat (3) of the oil tank, the oil outlet seat (3) is provided with an oil outlet, the oil outlet seat (3) is provided with a welding groove (4) around the oil outlet that cooperates with the welding boss, the bottom surface of the welding boss (2) is provided with at least two positioning stops (5), the welding groove (4) is provided with a positioning block (6) that cooperates with the positioning stops (5), the lower part of the oil outlet pipe (1) is provided with an integral connecting part (7), the diameter of the connecting part (7) is smaller than the diameter of the oil outlet pipe (1), the connecting part (7) extends out from the oil outlet and extends to the outside of the oil tank; the welding boss (2) is welded in the welding groove (4), and the positioning block (6) is embedded in the positioning stop (5).

2. The single cylinder diesel engine oil tank outlet seat fastening structure according to claim 1, characterized in that: The inner wall of the oil outlet pipe (1) is provided with multiple threaded openings (8) with gradually decreasing inner diameters from top to bottom.

3. The single cylinder diesel engine oil tank outlet seat fastening structure according to claim 2, characterized in that: Each of the aforementioned threaded openings (8) is provided with a first sealing ring (9) at its lower part.

4. The single cylinder diesel engine oil tank outlet seat fastening structure according to claim 3, characterized by: A second sealing ring (10) is provided on the bottom surface of the welding groove (4) near the oil outlet.

5. The single cylinder diesel engine oil tank outlet seat fastening structure according to claim 4, characterized by: A fastening nut (11) is threaded onto the connecting part (7), and the fastening nut (11) is screwed on to press it tightly against the bottom surface of the oil outlet seat (3).

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