An aero-engine oil pipe mounting structure and an aero-engine

Abstract

The application discloses an aero-engine oil pipe mounting structure in the technical field of aero-engine oil systems. The structure is characterized in that a positioning hole with a diameter larger than that of a first pipe joint is formed on an outer casing, so that the first pipe joint on the oil pipe has six degrees of freedom after being inserted into the positioning hole. Within a certain range, the position and angle of the oil pipe can be adjusted at will, space is provided for the connection between the second pipe joint and the bearing casing, the two ends of the oil pipe can be connected at any position of the outer casing and the bearing casing, the position of the positioning hole, the mounting hole for oil inlet on the bearing casing and the structural design between the outer casing and the bearing casing are no longer limited by the oil pipe, more design space is provided for the internal structural design of the outer casing and the inner casing, and therefore, the structural design can be more reasonable.

Description

Technical Field

[0001] This invention relates to the field of aircraft engine lubrication system technology, specifically to an aircraft engine lubrication pipe installation structure and an aircraft engine. Background Technology

[0002] The rotor pivot bearing of an aero-engine requires lubricating oil for lubrication and cooling. The bearing housing that supports the bearing is generally located inside the outer casing of the engine. The lubricating oil needs to be led from the outside through the outer casing to the lubricating oil passage in the bearing housing. Therefore, a lubricating oil pipe connection structure needs to be designed to connect the outer casing of the engine and the bearing housing, providing a lubricating oil supply or return passage for the bearing housing.

[0003] like Figure 4 As shown, existing solutions generally use an oil pipe that is directly inserted from the outside of the outer casing into the bearing casing. This requires that the oil pipe interfaces at the outer casing end and the bearing casing end be in a straight line.

[0004] Because the lubricating oil pipe is a rigid component and cannot be bent, the current design requires strict control over the connection position of the lubricating oil pipe on the outer casing and the bearing casing. If the lubricating oil pipe interfaces at the outer casing end and the bearing casing end are not on a straight line or if a straight pipe is not allowed to pass between them, such as if the combustion chamber is located between the outer casing and the bearing casing (the lubricating oil pipe is not allowed to be inserted into the combustion chamber), this design cannot be used. This imposes many restrictions on the design of the internal structure of the outer casing and the external structure of the bearing casing, which is not conducive to the rational design of the internal structure of the outer casing and the external structure of the bearing casing.

[0005] Based on this, the present invention designs an oil pipe mounting structure for an aircraft engine and an aircraft engine to solve the above problems. Summary of the Invention

[0006] To achieve the above objectives, the present invention provides the following technical solution: an oil pipe mounting structure for an aircraft engine, used to install an oil pipe between the outer casing and the bearing casing, comprising a first connecting structure at the first end of the oil pipe and a second connecting structure at the second end of the oil pipe, wherein the oil pipe is fixedly connected to the outer casing and the bearing casing respectively through the first connecting structure and the second connecting structure; a first pipe joint is fixedly provided at the first end of the oil pipe for connecting to an external oil pipe outside the outer casing, and a second pipe joint is fixedly provided at the second end of the oil pipe for connecting to an internal oil channel inside the bearing casing, so as to transport oil from the external oil pipe to the internal oil channel through the oil pipe; a positioning hole is provided on the outer casing, the diameter of the positioning hole being larger than the diameter of the first pipe joint, so that the first pipe joint has six degrees of freedom when located in the positioning hole; the first connecting structure includes a first fastener and a second fastener, both of which are threadedly engaged with the first pipe joint; the first fastener and the second fastener are used to clamp the first pipe joint in the positioning hole on the inner and outer surfaces of the outer casing.

[0007] As a further embodiment of the present invention, the first connection structure further includes a positioning pin ring disposed on the first pipe joint, wherein the inner diameter of the positioning pin ring matches the outer diameter of the first pipe joint, the outer diameter of the positioning pin ring matches the diameter of the positioning hole, and the height of the positioning pin ring does not exceed the depth of the positioning hole, and the first fastener, the positioning pin ring, and the second fastener are arranged sequentially on the first pipe joint along the axial direction of the first pipe joint.

[0008] As a further embodiment of the present invention, the height of the positioning pin ring is consistent with the depth of the positioning hole, so that both ends of the positioning pin ring can simultaneously contact the first fastener and the second fastener.

[0009] As a further embodiment of the present invention, one end of the positioning pin ring is provided with an outward protrusion, and the projection of the outward protrusion on the axial direction of the first pipe joint has a portion that extends beyond the opening of the positioning hole, so that the positioning pin ring can abut against the outer surface of the outer casing through the outward protrusion.

[0010] As a further embodiment of the present invention, the protruding portion is fixedly disposed at one end of the positioning pin ring near the second fastener.

[0011] As a further aspect of the present invention, the first fastener has an anti-rotation groove at one end facing the locating pin, and the locating pin has anti-rotation teeth on the side facing the first fastener for engaging in the anti-rotation groove, thereby restricting the relative rotation between the first fastener and the locating pin; the locating pin has a stop groove on the side facing the second fastener, and a stop washer is provided between the locating pin and the second fastener, with stop teeth on the side of the stop washer for engaging in the stop groove, thereby restricting the relative rotation between the stop washer and the locating pin; at least one locking lug is fixedly provided on the side of the stop washer, and the projection of the second fastener in the axial direction of the first pipe joint is polygonal, and the locking lug can be bent and pressed tightly against the side of the second fastener under external force to restrict the mutual rotation between the second fastener and the stop washer; the first fastener and the second fastener have the same thread direction.

[0012] As a further aspect of the present invention, the outer diameter of the first pipe joint is the same as the outer diameter of the lubricating oil pipe, so that the first fastener can be moved from the first pipe joint to the lubricating oil pipe.

[0013] As a further embodiment of the present invention, the bearing housing surface is provided with an installation hole for inserting a second pipe connector, the second pipe connector is provided with an oil pipe connector for inserting into the installation hole, and a sealing ring is installed on the outer surface of the oil pipe connector to seal the gap between the oil pipe connector and the installation hole when the oil pipe connector is inserted into the installation hole.

[0014] As a further embodiment of the present invention, the second connection structure includes a connecting flange fixed on the outer surface of the second pipe joint, and the outer surface of the bearing housing is provided with a threaded hole for installing the connecting flange.

[0015] An aircraft engine, including an aircraft engine lubricating oil pipe mounting structure.

[0016] The present invention has the following beneficial effects:

[0017] This structure, by creating a positioning hole on the outer casing with a diameter larger than that of the first pipe connector, allows the first pipe connector on the lubricating pipe to have six degrees of freedom after being inserted into the positioning hole. Within a certain range, the position and angle of the lubricating pipe can be adjusted at will, providing space for the subsequent connection of the second pipe connector to the bearing housing. This allows both ends of the lubricating pipe to be connected to any position in the outer casing and the bearing housing. Consequently, the position of the positioning hole, the mounting hole for oil inlet on the bearing housing, and the structural design between the outer casing and the bearing housing are no longer limited by the lubricating pipe, providing more design space for the internal structural design of the outer and inner casings, thus making the structural design more rational.

[0018] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0020] Figure 1 This is a schematic diagram of the structure after the present invention is installed.

[0021] Figure 2 This is a schematic diagram of the structure of the present invention after disassembly.

[0022] Figure 3 This is a schematic diagram showing the breakdown of the first connection structure in this invention.

[0023] Figure 4 This is a schematic diagram of existing technology.

[0024] Legend:

[0025] 11. Lubricating pipe; 12. First pipe fitting; 121. First thread; 122. Locating ring; 123. Second thread; 124. Conical end; 125. First end face; 13. Second pipe fitting; 131. Connecting flange; 132. Second end face; 133. Oil pipe fitting; 134. Sealing ring mounting groove; 14. First fastener; 141. Third thread; 142. Locating end face; 143. Anti-rotation groove; 2. Locating pin ring; 21. Inner cylindrical surface; 22. Outer cylindrical surface; 23. Anti-rotation tooth; 24. Stop groove; 3. Stop washer; 31. Locking lug; 32. Stop tooth; 4. Second fastener; 5. Sealing ring; 6. Outer casing; 61. First locating surface; 62. Second locating surface; 63. Locating hole; 7. Bearing casing. Detailed Implementation

[0026] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0027] Please see Figure 1-4The present invention provides a technical solution: an oil pipe installation structure for an aircraft engine, used to install an oil pipe 11 between the outer casing 6 and the bearing casing 7, including a first connecting structure at the first end of the oil pipe 11 and a second connecting structure at the second end of the oil pipe 11. The oil pipe 11 is fixedly connected to the outer casing 6 and the bearing casing 7 through the first connecting structure and the second connecting structure respectively. The first end of the oil pipe 11 is fixedly provided with a first pipe joint 12 for connecting to an external oil pipe outside the outer casing 6, and the second end of the oil pipe 11 is fixedly provided with a second pipe joint 13 for connecting to an internal oil passage inside the bearing casing 7, so as to transport oil from the external oil pipe to the internal oil passage through the oil pipe 11.

[0028] The outer casing 6 has a positioning hole 63. The diameter of the positioning hole 63 is larger than the diameter of the first pipe connector 12, so that the first pipe connector 12 has six degrees of freedom when it is located in the positioning hole 63. The first connection structure includes a first fastener 14 and a second fastener 4. Both the first fastener 14 and the second fastener 4 are threadedly engaged with the first pipe connector 12. The first fastener 14 and the second fastener 4 are used to clamp the first pipe connector 12 in the positioning hole 63 on the inner and outer surfaces of the outer casing 6.

[0029] In use, first remove the second fastener 4 from the first pipe connector 12, and move the first fastener 14 from the first pipe connector 12 to the second pipe connector 13. Then, insert the first pipe connector 12 from between the outer casing 6 and the bearing casing 7 into the positioning hole 63. Since the diameter of the positioning hole 63 is larger than the diameter of the first pipe connector 12, the first pipe connector 12 still has six degrees of freedom after being inserted into the positioning hole 63. The first pipe connector 12, the second pipe connector 13 and the lubricating pipe 11 can move freely within a certain range. At this time, the second pipe connector 13 can be connected to the internal lubricating channel opened in the bearing casing 7 by moving the second pipe connector 13. Then, the second pipe connector 13 is fixed on the bearing casing 7 by the second connection structure. After the bearing housing 7 is fixed, the first fastener 14 is moved towards the outer housing 6 on a pipe joint 12 and brought into contact with the inner surface of the outer housing 6. Then, the second fastener 4 is threaded onto the first pipe joint 12 and rotated to press the second fastener 4 against the outer surface of the outer housing 6, thereby fixing the first pipe joint 12 in the positioning hole 63 and completing the installation of the lubricating oil pipe 11 between the outer housing 6 and the bearing housing 7. The end of the first pipe joint 12 extending out of the outer housing 6 can be connected to an external lubricating oil pipeline. Finally, the lubricating oil enters the lubricating oil channel inside the bearing housing 7 after passing through the first pipe joint 12, the lubricating oil pipe 11, and the second pipe joint 13. By setting the diameter of the positioning hole 63 on the outer casing 6 for installing the lubricating pipe 11 to be larger than the diameter of the first pipe connector 12, the first pipe connector 12 on the lubricating pipe 11 has six degrees of freedom after being inserted into the positioning hole 63. This allows the lubricating pipe 11 to have a certain adjustment space between the outer casing 6 and the bearing casing 7. By adjusting the lubricating pipe 11, the second pipe connector 13 is connected to the internal lubricating channel in the bearing casing 7. When the lubricating pipe 11 needs to be twisted, a feasible solution is provided for the installation of the lubricating pipe 11. The position design of the positioning hole 63 on the outer casing 6 and the mounting hole for oil inlet opened on the bearing casing 7 is no longer restricted by the lubricating pipe 11, and there are fewer constraints when designing the internal structure of the outer casing 6.

[0030] This structure, by opening a positioning hole 63 on the outer casing 6 with a diameter larger than that of the first pipe connector 12, allows the first pipe connector 12 on the lubricating pipe 11 to have six degrees of freedom after being inserted into the positioning hole 63. Within a certain range, the position and angle of the lubricating pipe 11 can be adjusted at will, providing space for the subsequent connection of the second pipe connector 13 to the bearing casing 7. This allows the lubricating pipe 11 to bend and deform at will, thereby freeing the position of the positioning hole 63, the mounting hole for oil inlet on the bearing casing 7, and the structural design between the outer casing 6 and the bearing casing 7 from the limitations of the lubricating pipe 11, making the internal structural design of the outer casing 6 and the inner casing more reasonable.

[0031] Specifically, the size of the positioning hole 63 is designed according to the shape of the lubricating pipe 11 and the diameter of the first pipe connector 12. The greater the difference between the diameter of the positioning hole 63 and the diameter of the first pipe connector 12, the greater the adjustable range of the lubricating pipe 11 after the first pipe connector 12 enters the positioning hole 63. Conversely, the smaller the difference between the diameter of the positioning hole 63 and the diameter of the first pipe connector 12, the smaller the adjustable range of the lubricating pipe 11 after the first pipe connector 12 enters the positioning hole 63. Therefore, the size of the positioning hole 63 needs to be designed according to the actual shape of the lubricating pipe 11 and the diameter of the first pipe connector 12 to ensure that the second pipe connector 13 can be connected to the internal lubricating channel inside the bearing housing 7.

[0032] Specifically, such as Figure 2 As shown, the first fastener 14 has a protruding ring at one end facing the second fastener 4, and a positioning end face 142 for abutting against the inner surface of the outer casing 6 is formed on the protruding ring.

[0033] Specifically, the outer surface of the first pipe joint 12 is provided with external threads, and the first fastener 14 and the second fastener 4 are both provided with internal threads, so that the first fastener 14 and the second fastener 4 can be threadedly engaged with the first pipe joint 12.

[0034] Furthermore, such as Figure 2 As shown, the outer surface of the first pipe joint 12 is provided with a first thread 121 and a second thread 123, and the first fastener 14 and the second fastener 4 are respectively threaded into the first thread 121 and the second thread 123 on the outer surface of the first pipe joint 12.

[0035] Furthermore, in some examples, the inner cavity of the first fastener 14 is provided with a third thread 141, and the first fastener 14 engages with the external thread on the outer surface of the first pipe joint 12 through the third thread 141.

[0036] like Figure 1As shown, in some examples, the first connecting structure also includes a positioning pin ring 2. The positioning pin ring 2 has an inner cylindrical surface 21 and an outer cylindrical surface 22. The diameter of the inner cylindrical surface 21 matches the outer diameter of the first pipe joint 12, and the diameter of the outer cylindrical surface 22 matches the diameter of the positioning hole 63. The height of the positioning pin ring 2 does not exceed the depth of the positioning hole 63. Thus, the positioning pin ring 2 can be fitted onto the first pipe joint head. After the second pipe joint 13 is installed, the first pipe joint 12 needs to be fixed to the positioning hole 63 opened in the outer casing 6. When fixing the first pipe joint 12, the positioning pin ring 2 can be fitted onto the first pipe joint head so that the positioning pin ring 2 is inside the positioning hole 63. Since the diameter of the outer cylindrical surface 22 of the positioning pin ring 2 matches the inner diameter of the positioning hole 63, when the positioning pin ring 2 is inside the positioning hole 63, the outer diameter of the positioning pin ring 2... The cylindrical surface 22 can be tightly attached to the inner surface of the positioning hole 63, so that the positioning pin ring 2 only has the degree of freedom to move along the axial direction of the positioning hole 63. Since the positioning pin ring 2 is sleeved on the first pipe joint 12, the pipe joint will also only have the degree of freedom to move along the axial direction of the positioning hole 63. At this time, the first pipe joint is fixed in the positioning hole 63 by the first fastener 14 and the second fastener 4. The first pipe joint 12 will be completely fixed in the positioning hole 63. At the same time, since the positioning pin ring 2 fills the gap between the outer surface of the first pipe joint 12 and the inner surface of the positioning hole 63, it can ensure that the first pipe joint 12 will not shake during subsequent use, thereby improving the stability of the first pipe joint 12 after it is fixed in the positioning hole 63 by the first connecting structure, improving the safety of the lubricating pipe 11 and the safety of the lubricating system.

[0037] like Figure 1 As shown, the first pipe joint 12 is provided with a tapered end 124 at the end away from the lubricating oil pipe 11, and the first pipe joint 12 is connected to the external lubricating oil pipeline outside the outer casing 6 through the tapered end 124.

[0038] like Figure 2 As shown, in some examples, the surface of the first pipe joint 12 is provided with a positioning ring 122, the outer diameter of the positioning ring 122 is matched with the diameter of the inner cylindrical surface 21 of the positioning pin ring 2, and the degree of freedom of the first pipe joint 12 is restricted by the cooperation of the positioning ring 122 and the positioning pin ring 2.

[0039] When the first pipe joint 12 is fixed by the first fastener 14 and the second fastener 4, the first fastener 14, the locating pin ring 2 and the second fastener 4 are sequentially arranged on the first pipe joint 12 along the axial direction of the first pipe joint 12. The first fastener 14 is pressed against the inner surface of the outer casing 6, the second fastener 4 is pressed against the outer surface of the outer casing 6, and the locating pin ring 2 is located between the first fastener 14 and the second fastener 4.

[0040] In some examples, the height of the locating pin ring 2 is exactly the same as the depth of the locating hole 63. When the first fastener 14 and the second fastener 4 are pressed against the inner and outer surfaces of the outer casing 6 respectively, the first fastener 14 and the second fastener 4 can be pressed against the two ends of the locating pin ring 2 in the axial direction, thereby fixing the position of the locating pin ring 2 in the axial direction of the locating hole 63, preventing the locating pin ring 2 from moving in the locating hole 63 during subsequent use, improving the stability of the locating pin ring 2 in the locating hole 63, and reducing the wear of the locating pin ring 2.

[0041] like Figure 3 As shown, in some other examples, the outer cylindrical surface 22 of the positioning pin ring 2 is provided with an outward protrusion. The projection of the outward protrusion on the axial direction of the first pipe joint 12 has a portion that extends beyond the opening of the positioning hole 63, so that the positioning pin ring 2 can abut against the outer casing 6 through the outward protrusion. The first fastener 14 and the second fastener 4 approach each other, and the outward protrusion of the positioning pin ring 2 is also pressed against the outer casing 6 by the first fastener 14 or the second fastener 4. This can also prevent the positioning pin ring 2 from moving along the axial direction of the positioning hole 63 after the first pipe joint 12 is fixed in the positioning hole 63, reduce the wear of the positioning pin ring 2, and at the same time facilitate the removal of the positioning pin ring 2 from the positioning hole 63.

[0042] Furthermore, the outer cylindrical surface 22 of the positioning pin ring 2 has an outward protrusion located on the side of the positioning pin ring 2 near the second fastener 4. During the installation of the lubricating pipe 11, the second pipe joint 13 needs to be installed after the first pipe joint 12 is inserted into the positioning hole 63. During this process, in order to allow the lubricating pipe 11 to be adjusted at will, the positioning pin ring 2 cannot enter the positioning hole 63. Since the outer cylindrical surface 22 of the positioning pin ring 2 has an outward protrusion located on the side of the positioning pin ring 2 near the second fastener 4, the positioning pin ring 2 can be installed from the end of the first pipe joint extending from the outer casing 6 to the first pipe joint 12 after the second pipe joint is installed. The second fastener 4 can be installed after the positioning pin ring 2 is installed, making the installation process simpler.

[0043] Optionally, in some examples, if the outer cylindrical surface 22 of the locating pin ring 2 has a protrusion located on the side of the locating pin ring 2 near the second fastener 4, then the axial projection of the second fastener 4 on the first pipe joint 12 can be smaller than the locating hole 63, such as... Figure 3 As shown, the second fastener 4 is a hexagonal nut. The hexagonal nut presses the outer protrusion of the positioning pin ring 2, so that the outer protrusion is pressed against the outer surface of the outer casing 6. Together with the first fastener 14, it is pressed against the inner surface of the outer casing 6, which can also achieve the fixation of the first pipe connector 12 in the positioning hole 63.

[0044] like Figure 3As shown, in some examples, the first fastener 14 has an anti-rotation groove 143 at the end facing the locating pin ring 2. The locating pin ring 2 has an anti-rotation tooth 23 on the side facing the first fastener 14 for engaging in the anti-rotation groove 143. The anti-rotation tooth 23 engages in the anti-rotation groove 143 to restrict the relative rotation between the first fastener 14 and the locating pin. The locating pin ring 2 has a stop groove 24 on the side facing the second fastener 4. A stop washer 3 is provided between the locating pin ring 2 and the second fastener 4. The side of the stop washer 3 has a stop tooth 32 for engaging in the stop groove 24. The stop tooth 32 engages in the stop groove 24 to restrict the relative rotation between the stop washer 3 and the locating pin ring 2. At least one locking lug 31 is fixedly provided on the side of the stop washer 3. The projection of the second fastener 4 in the axial direction of the first pipe joint 12 is polygonal. The locking lug 31 can be bent and tightly attached to the side of the second fastener 4 under external force. The first fastener 14 and the second fastener 4 are locked in a stepwise manner to restrict the relative rotation between the second fastener 4 and the stop washer 3. At this time, the first fastener 14 and the second fastener 4 can only rotate synchronously. When the threads of the first fastener 14 and the second fastener 4 are in the same direction, the synchronous rotation of the first fastener 14 and the second fastener 4 will cause the first fastener 14 and the second fastener 4 to move in the same direction on the first pipe joint 12. Since the first fastener 14 and the second fastener 4 are pressed against the inner and outer surfaces of the outer casing 6 respectively, the first fastener 14 and the second fastener 4 cannot move in the same direction along the first pipe joint 12, thereby achieving the effect of preventing the first fastener 14 and the second fastener 4 from loosening and effectively improving the stability of the first pipe joint 12 during use.

[0045] During use, firstly, the first fastener 14 is pressed against the inner surface of the outer casing 6. Then, the locating pin ring 2 is inserted into the locating hole 63. When inserting the locating pin ring 2, the anti-rotation teeth 23 of the locating pin ring 2 are aligned with the anti-rotation groove 143 opened in the first fastener 14, so that the anti-rotation teeth 23 can be inserted into the anti-rotation groove 143 opened in the first fastener 14. Then, the stop washer 3 is placed on the locating pin ring 2. Similarly, when stopping the stop washer 3, the stop teeth 32 on the stop washer 3 are aligned with the stop groove 24 opened in the locating pin ring 2, so that the stop teeth 32 can be precisely inserted. The first fastener 14 is inserted into the stop groove 24, and then the second fastener 4 is tightened. The second fastener 4 presses the stop washer 3, and at the same time, the outward protrusion is pressed against the outer surface of the outer casing 6. Finally, the locking lug 31 on the stop washer 3 is bent toward the second fastener 4 and pressed against the side of the second fastener 4, thereby restricting the relative rotation between the second fastener 4, the stop washer 3, the locating pin ring 2 and the first fastener 14. Locking is achieved step by step along the axial direction of the first pipe joint 12, and finally the effect of restricting the relative rotation between the first fastener 14 and the second fastener 4 is achieved.

[0046] Furthermore, in some examples, the outer diameter of the first pipe fitting 12 is the same as the outer diameter of the lubricating pipe 11, so that the first fastener 14 can be moved from the first pipe fitting 12 onto the lubricating pipe 11. When the first pipe fitting 12 is inserted into the positioning hole 63 and the second pipe fitting 13 is connected to the bearing housing 7, the first pipe fitting 12 may need to tilt and move axially within the positioning hole 63. In order to prevent the first fastener 14 from affecting the range of motion of the first pipe fitting 12, the first fastener 14 can be retracted onto the lubricating pipe 11, thereby moving the first fastener 14 away from the positioning hole 63, so that the first fastener 14 will not affect the adjustment of the lubricating pipe 11.

[0047] Furthermore, such as Figure 1 As shown, the bearing housing 7 has an installation hole on its surface for inserting the second pipe connector 13. The second pipe connector 13 has an oil pipe connector 133 for inserting into the installation hole. The outer surface of the oil pipe connector 133 has a sealing ring mounting groove 134. A sealing ring 5 is installed in the sealing ring mounting groove 134 to seal the gap between the oil pipe connector 133 and the installation hole when the oil pipe connector 133 is inserted into the installation hole.

[0048] When installing the second pipe connector 13, insert the second pipe connector 13 into the mounting hole opened in the bearing housing 7 so that the second pipe connector 13 is connected to the internal lubricating oil pipe 11 in the bearing housing 7. At the same time, the sealing ring 5 installed on the outer surface of the oil pipe connector 133 seals the gap between the oil pipe connector 133 and the mounting hole to prevent lubricating oil leakage.

[0049] like Figure 1-2 As shown, in some examples, the second connection structure includes a connecting flange 131 fixed on the outer surface of the second pipe joint 13. The outer surface of the bearing housing 7 is provided with a threaded hole for installing the connecting flange 131. When installing the second pipe joint, the oil pipe joint 133 on the second pipe joint 13 is first inserted into the mounting hole opened in the bearing housing 7. At this time, the connecting flange 131 on the second pipe joint 13 is just in contact with the outer surface of the bearing housing 7. Then, the bolt passes through the connecting flange 131 and engages with the threaded hole opened in the bearing housing 7 to achieve the fixed installation of the second pipe joint on the bearing housing 7.

[0050] Furthermore, such as Figure 2 As shown, in some examples, the first pipe joint 12 is provided with a first end face 125, and the first pipe joint 12 is welded and fixed to the end face of the lubricating oil pipe 11 through the first end face 125. The second pipe joint 13 is provided with a second end face 132, and the second pipe joint 13 is welded and fixed to the other end face of the lubricating oil pipe 11 through the second end face 132.

[0051] like Figure 1As shown, the positioning hole 63 has a first positioning surface 61 and a second positioning surface 62 at its two ends in the axial direction. The first fastener 14 is pressed on the first positioning surface 61, and the outer protrusion of the outer cylindrical surface 22 of the positioning pin ring 2 is pressed on the second positioning surface 62 to fix the first pipe joint 12 in the positioning hole 63.

[0052] An aircraft engine, including the aforementioned aircraft engine lubricating oil pipe mounting structure.

[0053] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An oil pipe mounting structure for an aircraft engine, used to install an oil pipe (11) between an outer casing (6) and a bearing casing (7), comprising a first connecting structure disposed at a first end of the oil pipe (11) and a second connecting structure disposed at a second end of the oil pipe (11), wherein the oil pipe (11) is fixedly connected to the outer casing (6) and the bearing casing (7) respectively through the first connecting structure and the second connecting structure, characterized in that: The first end of the lubricating oil pipe (11) is fixed with a first pipe joint (12) for connecting to the external lubricating oil pipeline outside the outer casing (6), and the second end of the lubricating oil pipe (11) is fixed with a second pipe joint (13) for connecting to the internal lubricating oil passage inside the bearing casing (7), so as to transport lubricating oil from the external lubricating oil pipeline to the internal lubricating oil passage through the lubricating oil pipe (11). The outer casing (6) is provided with a positioning hole (63), the diameter of which is larger than the diameter of the first pipe joint (12), so that the first pipe joint (12) has six degrees of freedom when it is located in the positioning hole (63); The first connection structure includes a first fastener (14) and a second fastener (4), both of which are threadedly engaged with the first pipe fitting (12). The first fastener (14) and the second fastener (4) are used to clamp the first pipe joint (12) in the positioning hole (63) on the inner and outer surfaces of the outer casing (6); The first connection structure also includes a positioning pin (2) disposed on the first pipe joint (12). The inner diameter of the positioning pin (2) matches the outer diameter of the first pipe joint (12). The outer diameter of the positioning pin (2) matches the diameter of the positioning hole (63). The height of the positioning pin (2) does not exceed the depth of the positioning hole (63). The first fastener (14), the positioning pin (2), and the second fastener (4) are arranged sequentially along the axial direction of the first pipe joint (12) on the first pipe joint (12).

2. The mounting structure for an aircraft engine lubricating oil pipe according to claim 1, characterized in that: The height of the positioning pin (2) is consistent with the depth of the positioning hole (63) so that both ends of the positioning pin (2) can simultaneously contact the first fastener (14) and the second fastener (4).

3. The mounting structure for an aircraft engine lubricating oil pipe according to claim 1, characterized in that: One end of the positioning pin (2) is provided with an outward protrusion. The projection of the outward protrusion on the axial direction of the first pipe joint (12) has a portion that extends beyond the opening of the positioning hole (63), so that the positioning pin (2) can abut against the outer surface of the outer casing (6) through the outward protrusion.

4. The mounting structure for an aircraft engine lubricating oil pipe according to claim 3, characterized in that: The protruding part is fixedly disposed on the end of the positioning pin (2) near the second fastener (4).

5. The mounting structure for an aircraft engine lubricating oil pipe according to claim 3, characterized in that: The first fastener (14) has an anti-rotation groove (143) at one end facing the positioning pin (2), and the positioning pin (2) has an anti-rotation tooth (23) on the side facing the first fastener (14) for engaging in the anti-rotation groove (143). The anti-rotation tooth (23) engages in the anti-rotation groove (143) to restrict the relative rotation between the first fastener (14) and the positioning pin. The positioning pin (2) has a stop groove (24) on the side facing the second fastener (4), and a stop washer (3) is provided between the positioning pin (2) and the second fastener (4). The stop washer (3) has a stop tooth (32) on its side for engaging in the stop groove (24). The stop tooth (32) engages in the stop groove (24) to restrict the relative rotation between the stop washer (3) and the positioning pin (2). At least one locking lug (31) is fixedly provided on the side of the stop washer (3). The projection of the second fastener (4) on the axial direction of the first pipe joint (12) is a polygon. The locking lug (31) can be bent and pressed against the side of the second fastener (4) under the action of external force to restrict the mutual rotation between the second fastener (4) and the stop washer (3). The first fastener (14) and the second fastener (4) have the same thread direction.

6. The mounting structure for an aircraft engine lubricating oil pipe according to claim 1, characterized in that: The outer diameter of the first pipe joint (12) is the same as the outer diameter of the lubricating oil pipe (11) so that the first fastener (14) can be moved from the first pipe joint (12) to the lubricating oil pipe (11).

7. The mounting structure for an aircraft engine lubricating oil pipe according to claim 1, characterized in that: The bearing housing (7) has an installation hole for inserting a second pipe connector (13). The second pipe connector (13) is provided with an oil pipe connector (133) for inserting into the installation hole. A sealing ring (5) is installed on the outer surface of the oil pipe connector (133) to seal the gap between the oil pipe connector (133) and the installation hole when the oil pipe connector (133) is inserted into the installation hole.

8. The mounting structure for an aircraft engine lubricating oil pipe according to claim 1, characterized in that: The second connection structure includes a connecting flange (131) fixed on the outer surface of the second pipe joint (13), and the outer surface of the bearing housing (7) is provided with a threaded hole for installing the connecting flange (131).

9. An aircraft engine, characterized in that: Includes the aircraft engine lubricating oil pipe mounting structure as described in any one of claims 1-8.

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