Oil pipe mounting structure in box body

Abstract

The utility model relates to a mounting structure for an oil pipe in a box body, which comprises the box body, the oil pipe and a fixing device, and the box body is provided with a first mounting hole and a second mounting hole; the oil pipe comprises a first section, a second section and a third section which are sequentially arranged, a first preset bending angle is formed between the second section and the first section, a second preset bending angle is formed between the second section and the third section, the first section is in sealing fit with the first mounting hole, and the third section is in sealing fit with the second mounting hole; the fixing device penetrates through the second section, is connected with the box body and is used for limiting displacement of the oil pipe.

Description

Technical Field

[0001] This utility model relates to the field of cooling and lubrication technology, and in particular to an oil pipe installation structure inside a housing. Background Technology

[0002] In automotive transmission systems, specific lubrication systems are installed inside gearboxes such as drive axles and transmissions to ensure that critical components such as gears and bearings receive adequate lubrication and cooling. These lubrication systems typically consist of a network of oil lines built into the gearbox, delivering lubricating oil from the oil pump to the various points requiring lubrication.

[0003] The current installation methods for lubricating oil pipes in automotive transmission system gearboxes mainly include: direct insertion type, spiral locking type, flexible hose connection type, and segmented flange connection type. Among them, the direct insertion type requires precise alignment of the oil pipe with the axis of the gearbox mounting hole, while the spiral type requires continuous threads to be machined on the outer wall of the pipe and to be used with a special sealing gasket. The flexible hose type adapts to complex installation paths by manual bending, and the segmented type uses multiple straight pipes connected by flanges to form a specific path.

[0004] However, these traditional oil pipe installation methods have revealed many shortcomings in highly integrated modern transmission systems. The direct-insertion structure faces the problem of extremely high precision requirements for hole machining, making it difficult to adapt to the multi-point lubrication needs within complex housings; the spiral structure has high processing costs and poses risks to sealing reliability; flexible hose structures are prone to leakage problems due to stress fatigue; and segmented flange connections not only increase assembly complexity but also significantly increase system weight and leakage risk points.

[0005] Based on the above-mentioned defects, designing an internal oil pipe structure that can adapt to the layout requirements of non-collinear mounting holes, simplify the assembly process, and provide sufficient sealing reliability has become an urgent technical problem to be solved. Utility Model Content

[0006] This utility model discloses an oil pipe installation structure inside a box, which aims to solve the technical problems existing in the prior art.

[0007] The present invention adopts the following technical solution:

[0008] This utility model embodiment provides an oil pipe installation structure inside a box, including:

[0009] - The housing has a first mounting hole and a second mounting hole;

[0010] - Oil pipe, the oil pipe includes a first section, a second section and a third section arranged in sequence, the second section and the first section have a first preset bending angle, the second section and the third section have a second preset bending angle, the first section is sealed and fitted with a first mounting hole, and the third section is sealed and fitted with a second mounting hole.

[0011] - A fixing device, which passes through the second section and connects to the housing, is used to limit the displacement of the oil pipe.

[0012] As a preferred technical solution, the first mounting hole and the second mounting hole are not coaxial.

[0013] As a preferred technical solution, the first preset bending angle and the second preset bending angle are configured as a symmetrical or asymmetrical structure to match the positions of the first mounting hole and / or the second mounting hole.

[0014] As a preferred technical solution, both the first preset bending angle and the second preset bending angle are obtuse angles.

[0015] As a preferred technical solution, the first segment and the third segment are set in parallel, with the two offset by a preset distance.

[0016] As a preferred technical solution, both the first section and the third section are provided with annular sealing grooves at their ends, and sealing elements are provided inside the annular sealing grooves.

[0017] As a preferred technical solution, the sealing element includes an O-ring.

[0018] As a preferred technical solution, the fixing device includes a bolt that passes through the second section and a threaded hole that fits into the housing.

[0019] As a preferred technical solution, the second section has a predetermined gap from the surface of the box, and the fixing device is connected to the box through the predetermined gap.

[0020] As a preferred technical solution, the first section, the second section and the third section are configured as an integrally formed metal tube.

[0021] One embodiment of the above-described utility model has the following advantages or beneficial effects:

[0022] This utility model mainly provides an oil pipe installation structure inside a housing. Compared with the prior art, this utility model sets the oil pipe inside the housing as an integrated multi-segment structure, which can support various irregular paths to meet complex oil injection and lubrication routes. In addition, when installing the oil pipe, it can adaptively match the mounting hole by rotation. On the one hand, it allows for a certain positional tolerance of the mounting hole, effectively solving the problem of connecting non-coaxial mounting holes inside the housing, without imposing excessively high requirements on the housing machining accuracy, thus reducing manufacturing costs. On the other hand, the rotational alignment operation shortens the installation time, and the oil pipe can be disassembled by reverse rotation, improving assembly efficiency and maintenance convenience.

[0023] Because the tubing is manufactured using a one-piece molding process, flanges and unnecessary fasteners are eliminated, removing multiple sealing points found in traditional segmented connection structures. This not only reduces the overall weight of the system but also significantly lowers the risk of leakage and enhances system reliability. Meanwhile, the annular sealing groove at the end, combined with an O-ring, ensures a tight seal between the tubing and the mounting hole.

[0024] Furthermore, the design of the fixing device passing through the second section and connecting to the housing, along with the rigid support of the oil pipe structure itself, effectively restricts the displacement and rotation of the oil pipe, improving installation stability. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below, forming part of this utility model. The illustrative embodiments of this utility model and their descriptions explain this utility model and do not constitute an improper limitation of this utility model. In the accompanying drawings:

[0026] Figure 1 This is a schematic diagram of the oil pipe installation structure inside the box provided in a preferred embodiment of the present utility model;

[0027] Figure 2 This is a schematic diagram of the oil pipe installation process inside the box in a preferred embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the oil pipe installation process inside the box in a preferred embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the oil pipe installation process inside the box in a preferred embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] The housing 10 includes a first mounting hole 11, a second mounting hole 12, an oil pipe 20, a first section 21, a second section 22, a third section 23, and an annular sealing groove 24. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. In the description of this utility model, it should be noted that the term "or" is generally used to include the meaning of "and / or," unless otherwise expressly stated otherwise.

[0033] In the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] Obviously, the described embodiments are only some embodiments of this utility model, and 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] refer to Figure 1 — Figure 4 To address the shortcomings of traditional oil pipes during installation, this utility model provides an oil pipe installation structure within a housing. Preferably, the installation structure includes a housing 10, an oil pipe 20, and a fixing device. The housing 10 has a first mounting hole 11 and a second mounting hole 12. The oil pipe 20 includes a first section 21, a second section 22, and a third section 23 arranged sequentially. The three sections are integrally formed. The first section 21 is sealed to the first mounting hole 11, and the third section 23 is sealed to the second mounting hole 12. The fixing device passes through the second section 22 and connects to the housing 10 to limit the displacement of the oil pipe 20.

[0036] In a preferred embodiment, the housing 10 is configured as a gearbox in an automotive transmission system, such as a gearbox, drive axle, or transfer case, which is a sealed housing structure that requires internal lubrication. The housing 10 contains transmission components such as gear sets and bearings that require lubrication. These components need to be adequately lubricated during high-speed operation to reduce friction and wear.

[0037] Specifically, the positions of the first mounting hole 11 and the second mounting hole 12 are configured according to the distribution of lubrication demand points inside the housing 10, and are not limited here. In this embodiment, the first mounting hole 11 and the second mounting hole 12 are configured to be non-coaxial. Those skilled in the art should understand that the purpose of the non-coaxial arrangement is to enable the oil pipe 20 to reach specific lubrication positions.

[0038] In a preferred embodiment, the oil pipe 20 is configured as a one-piece metal pipe, preferably made of aluminum alloy, stainless steel, or other alloy materials, to form a specific lubricating oil delivery channel inside the housing 10. The inner surface of the oil pipe 20 has a smooth transition, reducing oil flow resistance and improving lubrication efficiency. Since the dimensions of the oil pipe 20 are limited by the dimensions of the housing 10, the dimensional parameters of the oil pipe 20 are not specifically limited in this embodiment.

[0039] In this embodiment, the oil pipe 20 is integrated into the housing 10, meaning that the oil pipe 20 becomes a built-in component of the lubrication system of the housing 10. On the one hand, this ensures the sealing and integrity of the lubrication system, avoids interference from the external environment, and reduces external connection points, thereby reducing the risk of leakage. On the other hand, the built-in oil pipe 20 can more accurately deliver lubricating oil to specific locations inside the housing 10 to optimize the lubrication effect. In addition, integrating the oil pipe 20 into the housing 10 also helps to make the overall structure more compact, thereby reducing external protruding structures and reducing the overall space occupied by the transmission system.

[0040] In a preferred embodiment, the first section 21 and the third section 23 are arranged in parallel and offset by a preset distance. This preset distance is at least greater than the diameter of the oil pipe 20, for example, it can be set to an offset of 15 mm, so that the oil pipe 20 can adapt to the position requirements of the two non-coaxial mounting holes on the housing 10, thereby increasing the freedom of the mounting hole arrangement of the housing 10.

[0041] In a preferred embodiment, the second segment 22 serves as a connecting segment, forming a first preset bending angle with the first segment 21 and a second preset bending angle with the third segment 23. These two angles can be designed to be equal to form a symmetrical structure, or they can be designed to be unequal to form an asymmetrical structure. The specific values ​​can be adjusted flexibly according to the location of the oil injection point and the distribution of the first mounting hole 11 and the second mounting hole 12. Preferably, both the first preset bending angle and the second preset bending angle are obtuse angles, specifically set to an angle of approximately 120°. The oil pipe 20 then has a roughly Z-shaped bending structure, which not only meets the requirements of complex oil injection and lubrication routes, but also gives the oil pipe 20 good rotational self-adaptive characteristics during installation. By rotating and aligning, both ends can be easily aligned with their respective mounting holes, significantly improving installation efficiency and reducing the machining accuracy requirements of the housing 10.

[0042] In a preferred embodiment, both the first section 21 and the third section 23 are provided with annular sealing grooves 24 at their ends. A sealing element is provided within the annular sealing groove 24, preferably an O-ring, which offers advantages such as simple structure, reliable sealing effect, and ease of replacement. The O-ring is preferably made of fluororubber, which has excellent oil resistance, temperature resistance, and aging resistance. It maintains good elasticity and sealing performance within a working temperature range of -20℃ to 200℃ and exhibits excellent chemical stability to various lubricating oils.

[0043] Specifically, the annular sealing groove 24 is precisely machined on the outer wall of the end of the first section 21 and the third section 23 to accommodate the sealing element; the size of the annular sealing groove 24 matches the specific size of the selected sealing element, and the groove width is usually slightly larger than the cross-sectional diameter of the O-ring seal, while the groove depth needs to take into account the sealing compression.

[0044] In this embodiment, when the two ends of the oil pipe 20 are inserted into the first mounting hole 11 and the second mounting hole 12 respectively, the O-ring seal is radially compressed, generating an appropriate compression ratio, typically 15%-20%. The elastic reaction force generated by this compression deformation forms an effective seal, preventing oil leakage. The length of the sealing section matches the insertion depth, ensuring consistent sealing compression at both ends, thereby achieving a reliable sealing effect and reducing the system leakage rate to below 0.01 mL / min, which meets the testing requirements of ISO 10763 standard.

[0045] In a preferred embodiment, the fixing device includes a bolt passing through the second section 22 and a threaded hole that fits into the housing 10; preferably, the second section 22 is provided with a predetermined gap from the surface of the housing 10, and the fixing device is connected to the housing 10 through the predetermined gap.

[0046] In a preferred embodiment, the bolt is preferably a standard M6 fastener made of high-strength steel to ensure sufficient tensile strength and shear resistance. The bolt is preferably installed in the center of the second section 22 of the oil pipe 20, which typically has the highest rigidity and provides a stable fixing effect.

[0047] Specifically, after the bolt passes through the pre-set fixing hole on the oil pipe 20, it precisely engages with the threaded hole on the housing 10. A pre-tightening force is used to resist any axial vibration displacement that the oil pipe 20 may generate. Preferably, the recommended torque of the pre-tightening force is ≥50 N·m. A predetermined gap is maintained between the second section 22 and the surface of the housing 10. This predetermined gap is controlled within the range of 5-10 mm, which facilitates installation and provides the necessary space for the bolt to pass through. Simultaneously, the clearance fit accuracy between the bolt and the fixing hole is controlled within 0.05 mm, which not only limits the axial displacement of the oil pipe 20 but also effectively suppresses the circumferential rotation tendency of the oil pipe 20, increasing the vibration tolerance frequency of the connection point to over 300 Hz.

[0048] In this embodiment, the oil pipe 20 is installed using a segmented rotary insertion method, specifically including the following steps: Figure 2 First, insert the first section 21 of the oil pipe 20 into the first mounting hole 11 to a certain depth, such as 20mm. At this point, the end of the first section 21 enters the first mounting hole 11, but due to the Z-shaped offset structure, the end of the third section 23 is not yet aligned with the second mounting hole 12; then, as... Figure 3 Using the insertion portion of the first section 21 as the axis, the oil pipe 20 is rotated by a certain angle, such as 60°. Utilizing the spatial orientation adjustment characteristics of the Z-shaped structure, the end of the third section 23 is aligned with the axis of the second mounting hole 12; furthermore, as... Figure 4 The oil pipe 20 is then advanced until the third section 23 is inserted approximately 10mm in the reverse direction along the second mounting hole 12, forming an effective sealing section. At this point, the first section 21 and the third section 23 form a sealing fit in their respective mounting holes, and the sealing element is appropriately compressed. Finally, a through bolt is passed laterally through the pre-set fixing hole of the second section 22 of the oil pipe 20 and connected to the threaded hole of the housing 10 for fastening, restricting the axial displacement and rotational freedom of the oil pipe 20. This installation method allows for non-collinear arrangement of the two mounting holes, is highly adaptable, suitable for irregular hole layouts, and can meet complex oil injection and lubrication routes. It also reduces the requirements for the machining accuracy of the housing 10, improves assembly efficiency, and achieves a reliable sealing effect. Furthermore, since the oil pipe 20 only requires one bolt for fixing and limiting, it also reduces assembly difficulty and component weight.

[0049] Although exemplary embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above exemplary embodiments are merely illustrative and are not intended to limit the scope of this application. Various changes and modifications can be made therein by those skilled in the art without departing from the scope and spirit of this application. All such changes and modifications are intended to be included within the scope of this application as claimed in the appended claims.

[0050] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of this application may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0051] Similarly, it should be understood that, in order to streamline this application and aid in understanding one or more of the various aspects of the invention, features of this application may sometimes be grouped together in a single embodiment, figure, or description thereof in the description of exemplary embodiments of this application. However, this approach should not be construed as reflecting an intention that the claimed application requires more features than are expressly recited in each claim. Rather, as reflected in the corresponding claims, its novelty lies in the fact that the corresponding technical problem can be solved with fewer features than all of those in a single disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of this application.

[0052] Those skilled in the art will understand that, apart from the mutual exclusion of features, all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or elements of any method or apparatus so disclosed can be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature serving the same, equivalent, or similar purpose.

Claims

1. A structure for installing an oil pipe in a case, characterized by comprising: The application relates to an oil pipe fixing device for an engine, which comprises the following parts: a box provided with a first mounting hole and a second mounting hole; an oil pipe comprising a first section, a second section and a third section arranged in sequence, the second section and the first section being provided with a first preset bending angle, the second section and the third section being provided with a second preset bending angle, the first section being sealingly matched with the first mounting hole, and the third section being sealingly matched with the second mounting hole; a fixing device penetrating through the second section and connected with the box, used for limiting the displacement of the oil pipe.

2. The in-tank tube installation structure according to claim 1, characterized by The first mounting hole and the second mounting hole are arranged in a non-coaxial mode.

3. The in-tank tube installation structure according to claim 2, characterized by The first preset bending angle and the second preset bending angle are configured in a symmetrical or asymmetrical structure, used for matching the positions of the first mounting hole and / or the second mounting hole.

4. The in-tank tube installation structure according to claim 3, characterized by The first preset bending angle and the second preset bending angle are both obtuse angles.

5. The in-tank tube installation structure according to claim 1, characterized by The first section and the third section are arranged in parallel and offset by a preset distance.

6. The in-tank tube installation structure according to claim 1, characterized by The end portions of the first section and the third section are provided with annular sealing grooves, and sealing elements are arranged in the annular sealing grooves.

7. The in-tank tube installation structure according to claim 6, characterized by The sealing elements comprise O-shaped sealing rings.

8. The in-tank tube installation structure according to claim 1, characterized by The fixing device comprises a bolt penetrating through the second section and a threaded hole matched with the box.

9. The in-tank tube installation structure according to claim 1, characterized by The second section is provided with a predetermined gap from the surface of the box, and the fixing device is connected with the box through the predetermined gap.

10. The in-tank tube installation structure according to claim 1, characterized by The first section, the second section and the third section are configured as an integrally-formed metal pipe.

Images