A center tube anti-stress damage structure for a diesel engine oil tank

Abstract

This utility model discloses a structure for preventing damage to the center tube of a diesel engine fuel tank under stress. It includes a fuel tank shell and a center tube that penetrates and extends into the fuel tank shell, with the lower end of the center tube close to the fuel tank shell. The fuel tank shell has a mounting hole, and a mounting seat is welded around the mounting hole. The top surface of the mounting seat has a first mounting groove. A flange is integrally formed on the outer wall of the upper end of the center tube, and the flange is bolted into the first mounting groove. A first elastic support is fixed inside the mounting hole and fitted around the center tube. An anti-sway seat is welded to the lower part of the fuel tank shell, and a second elastic support is embedded in the anti-sway seat and fitted around the center tube. The center tube is fixed in the mounting groove by the flange, eliminating the need for welding and improving the convenience of installation and disassembly.

Description

Technical Field

[0001] This utility model relates to the field of fuel tank technology, specifically to a structure for preventing damage to the central tube of a diesel engine fuel tank under stress. Background Technology

[0002] The center pipe (also known as the fuel inlet pipe or fuel outlet pipe) inside the diesel engine fuel tank is a key component of the fuel system, responsible for delivering fuel to the engine or returning excess fuel to the fuel tank. Currently, the fuel tank center pipe is usually directly fixed to the bottom or side wall of the fuel tank by welding or threaded rigid connection.

[0003] In practical use, diesel engines (especially those used in construction machinery and heavy-duty trucks) are often subjected to severe vibration and impact conditions. This rigid connection method has significant drawbacks: First, currently, the center tube is mostly installed on the fuel tank by welding, which is inconvenient for installation and disassembly. Moreover, stress concentration at the weld joint makes it prone to fatigue cracks under long-term alternating loads, leading to fuel leakage and posing a safety hazard. Second, when the fuel tank is handled, installed, or subjected to impact, the center tube may sway at a large angle. External forces will be directly transmitted to the fuel tank body through the rigidly connected center tube, easily causing damage to the fuel tank wall or the center tube itself. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a structure to prevent damage to the center tube of a diesel engine fuel tank under stress. By improving the connection method between the center tube and the fuel tank, it effectively buffers and disperses external stress, preventing the center tube from being damaged by vibration, impact, shaking, or external force, thereby improving the reliability and safety of the connection.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A structure for preventing damage to the center tube of a diesel engine fuel tank under stress includes a fuel tank housing and a center tube that penetrates and extends into the fuel tank housing, with the lower end of the center tube close to the fuel tank housing. The fuel tank housing has a mounting hole, and a mounting seat is welded to the periphery of the mounting hole. The top surface of the mounting seat has a first mounting groove. A Z-shaped flange is integrally formed on the outer wall of the upper end of the center tube, and the flange is bolted into the first mounting groove. A first elastic support is fixed in the mounting hole and fitted around the center tube. An anti-sway seat is welded to the lower part of the fuel tank housing, and a second elastic support is embedded within the anti-sway seat and fitted around the center tube. The first and second elastic supports radially support the center tube. The lower part of the anti-sway seat has several oil passage holes to connect the interior of the anti-sway seat to the fuel tank housing.

[0006] Preferably, both the first elastic support and the second elastic support are rubber bushings or polyurethane bushings, and both are interference-fitted onto the outside of the central tube.

[0007] Preferably, the inner wall of the first elastic support member is provided with at least two first annular grooves, and a first sealing ring with a trapezoidal cross-section is embedded in the first annular groove.

[0008] Preferably, the bottom surface of the flange is provided with a second annular groove, and a second sealing ring with a trapezoidal cross-section is embedded in the second annular groove.

[0009] Preferably, a connecting pipe is welded to the inner wall of the fuel tank housing around the mounting hole, and the lower part of the first elastic support is fixed inside the connecting pipe.

[0010] Preferably, the inner wall of the anti-sway seat is provided with a third annular groove, and the second elastic support is fixed in the third annular groove.

[0011] Preferably, the bottom of the fuel tank housing is provided with a second mounting groove, and the bottom of the anti-sway seat is welded into the second mounting groove so that the lowest point of the oil passage hole is flush with the bottom surface inside the fuel tank housing.

[0012] Compared with the prior art, the beneficial effects of this utility model are: The center tube is fixed in the mounting groove by a flange, eliminating the need for welding and improving the convenience of installation and disassembly. The inclusion of a first elastic support effectively absorbs and buffers vibration and impact energy from the diesel engine body and external sources, preventing stress concentration at the connection point and significantly reducing the risk of fatigue-induced cracking at the connection between the center tube and the fuel tank.

[0013] The elastic support allows for a slight radial offset of the central tube, which can compensate for dimensional changes in the tank or central tube caused by temperature changes, stress deformation, etc., and avoid additional stress caused by rigid constraints.

[0014] An anti-sway seat is installed inside the tank shell to limit excessive swinging of the central tube inside the tank. In addition, the lower end of the central tube is flexibly supported by a second elastic support, forming a stable structure of "flexible support at the root and limiting at the end", which avoids stress concentration and ensures the working stability of the central tube. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 for Figure 1 Enlarged view at point B in the middle; Figure 4A diagram illustrating the anti-wobbling mechanism; In the figure: 1-oil tank shell, 2-central pipe, 3-mounting seat, 4-first mounting groove, 5-flange, 6-first elastic support, 7-anti-sway seat, 8-second elastic support, 9-oil passage hole, 10-first sealing ring, 11-second sealing ring, 12-connecting pipe, 13-second mounting groove. Detailed Implementation

[0016] 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.

[0017] Example 1 Please see Figure 1-3 A structure for preventing damage to the central tube of a diesel engine oil tank under stress includes an oil tank housing 1 and a central tube 2 that penetrates and extends into the interior of the oil tank housing 1. The lower end of the central tube 2 is close to the oil tank housing 1, thereby facilitating the entry of engine oil from the lower end of the central tube into the central tube.

[0018] The fuel tank housing 1 is provided with mounting holes. A mounting base 3 is welded to the outer periphery of the mounting holes on the fuel tank housing 1. A first mounting groove 4 is provided on the top surface of the mounting base 3. A circumferential screw hole is provided in the first mounting groove 4. A Z-shaped flange 5 is integrally formed on the outer wall of the upper end of the central tube 2. The flange 5 is installed in the first mounting groove 4 by bolts without welding.

[0019] Example 2 A first elastic support 6 is fixed inside the mounting hole. The first elastic support 6 is a rubber bushing or a polyurethane bushing, and is interference-fitted onto the outside of the central tube 2.

[0020] An anti-sway seat 7 is welded to the lower part of the tank housing 1. The inner wall of the anti-sway seat 7 is provided with a third annular groove, and the second elastic support 8 is fixed in the third annular groove. The second elastic support 8 is also a rubber bushing or a polyurethane bushing, which is interference-fitted onto the periphery of the central tube 2. The central tube 2 is supported radially by the first elastic support 6 and the second elastic support 8, thereby providing a certain degree of flexibility and displacement in the radial direction.

[0021] The lower part of the anti-sway seat 7 is provided with several oil passage holes 9 to connect the interior of the anti-sway seat 7 with the oil tank housing 1. The bottom of the oil tank housing 1 is provided with a second mounting groove 13, and the bottom of the anti-sway seat 7 is welded into the second mounting groove 13 so that the lowest point of the oil passage hole 9 is flush with the bottom surface inside the oil tank housing 1, thereby facilitating the oil passage hole to enter the oil inlet pipe from inside the oil tank housing.

[0022] The anti-sway seat and the second elastic support effectively limit the excessive lateral sway of the central tube when the fuel sloshes or the vehicle bumps, thus avoiding rigid collisions and wear with the inner wall of the fuel tank.

[0023] Example 3 The inner wall of the first elastic support 6 is provided with at least two first annular grooves, and a first sealing ring 10 with a trapezoidal cross-section is embedded in the first annular groove to improve the sealing performance between the first elastic support 6 and the central pipe. The bottom surface of the flange 5 is provided with a second annular groove, and a second sealing ring 11 with a trapezoidal cross-section is embedded in the second annular groove to improve the sealing performance between the flange and the first mounting groove.

[0024] A connecting pipe 12 is welded to the inner wall of the fuel tank housing 1 around the mounting hole, and the lower part of the first elastic support 6 is fixed inside the connecting pipe 12. The connecting pipe 12 can cover the lower part of the first elastic support 6 to restrict the first elastic support and prevent it from shifting outward after being squeezed.

[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 structure for preventing damage to a central tube in a diesel engine fuel tank under stress, comprising a fuel tank housing (1) and a central tube (2) penetrating and extending into the interior of the fuel tank housing (1), wherein the lower end of the central tube (2) is close to the fuel tank housing (1); characterized in that: The tank housing (1) is provided with mounting holes. A mounting seat (3) is welded to the outside of the mounting holes on the tank housing (1). A first mounting groove (4) is provided on the top surface of the mounting seat (3). A flange (5) with a Z-shaped cross section is integrally formed on the outer wall of the upper end of the central tube (2). The flange (5) is installed in the first mounting groove (4) by bolts. A first elastic support (6) is fixed in the mounting hole. The first elastic support (6) is fitted around the outside of the central tube (2). An anti-sway seat (7) is welded to the lower part inside the tank housing (1). A second elastic support (8) is embedded in the anti-sway seat (7). The second elastic support (8) is fitted around the outside of the central tube (2). The first elastic support (6) and the second elastic support (8) support the central tube (2) in the radial direction. A number of oil passage holes (9) are provided at the lower part of the anti-sway seat (7) to connect the inside of the anti-sway seat (7) with the tank housing (1).

2. The structure for preventing damage to the central tube of a diesel engine oil tank under stress according to claim 1, characterized in that: The first elastic support (6) and the second elastic support (8) are both rubber bushings or polyurethane bushings, and both are interference-fitted onto the outside of the central tube (2).

3. The structure for preventing damage to the central tube of a diesel engine oil tank under stress according to claim 2, characterized in that: The inner wall of the first elastic support member (6) is provided with at least two first annular grooves, and a first sealing ring (10) with a trapezoidal cross section is embedded in the first annular groove.

4. The structure for preventing damage to the central tube of a diesel engine oil tank under stress according to claim 3, characterized in that: The bottom surface of the flange (5) is provided with a second annular groove, and a second sealing ring (11) with a trapezoidal cross section is embedded in the second annular groove.

5. The structure for preventing damage to the central tube of a diesel engine oil tank under stress according to claim 4, characterized in that: The inner wall of the oil tank housing (1) is welded with a connecting pipe (12) around the mounting hole, and the lower part of the first elastic support (6) is fixed inside the connecting pipe (12).

6. The structure for preventing damage to the central tube of a diesel engine oil tank under stress according to claim 5, characterized in that: The inner wall of the anti-sway seat (7) is provided with a third annular groove, and the second elastic support (8) is fixed in the third annular groove.

7. The structure for preventing damage to the central tube of a diesel engine oil tank under stress according to claim 6, characterized in that: The bottom of the oil tank housing (1) is provided with a second mounting groove (13), and the bottom of the anti-sway seat (7) is welded to the second mounting groove (13) so that the lowest point of the oil passage hole (9) is flush with the bottom surface inside the oil tank housing (1).

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