Lubricating oil pipe mounting structure of aero-engine and aero-engine

Abstract

The invention discloses an aero-engine lubricating oil pipe mounting structure in the technical field of aero-engine lubricating oil systems, according to the structure, a positioning hole with the diameter larger than that of a first pipe joint is formed in an outer casing, so that the first pipe joint on a lubricating oil pipe further has six degrees of freedom after being inserted into the positioning hole, and in a certain range, the degree of freedom is increased; the position and angle of the lubricating oil pipe can be adjusted at will, and space is provided for subsequent connection of the second pipe connector and the bearing casing, so that the two ends of the lubricating oil pipe can be connected to any position of the outer casing and the bearing casing. Therefore, the position of the positioning hole, a mounting hole for oil feeding in the bearing casing and the structural design between the outer casing and the bearing casing are not limited by the lubricating oil pipe any more, more design space is provided for the internal structural design of the outer casing and the inner casing, and the structural design can be more reasonable.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft engine lubricating oil systems, and in particular to an aircraft engine lubricating oil pipe mounting structure and an aircraft engine. Background Art

[0002] The rotor fulcrum bearings of aircraft engines need to be lubricated and cooled with lubricating oil, and the bearing casing that provides support for the bearings is generally located inside the outer casing of the engine. The oil from the outside needs to pass through the outer casing and be led to the oil channel of the bearing casing. For this purpose, a lubricating oil pipe connection structure needs to be designed to connect the outer casing of the engine and the bearing casing, providing a lubricating oil supply or return channel for the bearing casing.

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

[0004] Since the oil pipe is a rigid part and cannot be bent, the current solution requires strict control of the position when designing the connection position of the oil pipe on the outer casing and the bearing casing. If the oil pipe interfaces at the outer casing end and the bearing casing end are not in a straight line or no straight pipe is allowed to pass between the two, such as if there is a combustion chamber between the outer casing and the bearing casing (the oil pipe is not allowed to be inserted into the combustion chamber), this solution cannot be used. There are many restrictions when designing the internal structure of the outer casing and the external structure of the bearing casing, which is not conducive to the reasonable 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 aircraft engine lubricating oil pipe installation structure and an aircraft engine to solve the above problems. Summary of the invention

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an aircraft engine oil pipe installation structure, used for installing the oil pipe between the outer casing and the bearing casing, comprising a first connection structure arranged at the first end of the oil pipe and a second connection structure arranged at the second end of the oil pipe, the oil pipe is fixedly connected to the outer casing and the bearing casing respectively through the first connection structure and the second connection structure, the first end of the oil pipe is fixedly provided with a first pipe joint for connecting to an external oil pipeline outside the outer casing, and the second end of the oil pipe is fixedly provided with a second pipe joint for connecting to an internal oil channel in the bearing casing, so as to transport the oil from the external oil pipeline to the internal oil channel through the oil pipe; a positioning hole is opened on the outer casing, the diameter of the positioning hole is larger than the diameter of the first pipe joint, so that the first pipe joint has six degrees of freedom when it is located in the positioning hole; the first connection structure comprises a first fastener and a second fastener, and the first fastener and the second fastener are both threadedly engaged with the first pipe joint; the first fastener and the second fastener are used to clamp the inner surface and the outer surface of the outer casing to fix the first pipe joint in the positioning hole.

[0007] As a further solution of the present invention, the first connection structure also includes a positioning pin ring provided on the first pipe joint, 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 in sequence on the first pipe joint along the axial direction of the first pipe joint.

[0008] As a further solution 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 contact the first fastener and the second fastener at the same time.

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

[0010] As a further solution of the present invention, the outer protrusion is fixedly arranged on one end of the positioning pin ring close to the second fastener.

[0011] As a further solution of the present invention, an anti-rotation groove is provided at one end of the first fastener facing the positioning pin ring, and an anti-rotation tooth for engaging in the anti-rotation groove is provided on the side of the positioning pin ring facing the first fastener, and the relative rotation between the first fastener and the positioning pin is limited by the anti-rotation tooth engaging in the anti-rotation groove; a stopping groove is provided on the side of the positioning pin ring facing the second fastener, a stopping washer is provided between the positioning pin ring and the second fastener, and a stopping tooth for engaging in the stopping groove is provided on the side of the stopping washer, and the relative rotation between the stopping washer and the positioning pin ring is limited by the stopping tooth engaging in the stopping groove; at least one locking ear is fixedly provided on the side of the stopping washer, and the projection of the second fastener on the axial direction of the first pipe joint is a polygon, and the locking ear can be bent under the action of external force and tightly attached to the side of the second fastener to limit the mutual rotation between the second fastener and the stopping washer; the first fastener and the second fastener have the same thread rotation direction.

[0012] As a further solution 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 solution of the present invention, a mounting hole for inserting a second pipe joint is opened on the surface of the bearing casing, and an oil pipe joint for inserting into the mounting hole is provided on the second pipe joint. A sealing ring is installed on the outer surface of the oil pipe joint to seal the gap between the oil pipe joint and the mounting hole when the oil pipe joint is inserted into the mounting hole.

[0014] As a further solution of the present invention, the second connection structure includes a connection flange fixedly arranged on the outer surface of the second pipe joint, and a threaded hole for installing the connection flange is provided on the outer surface of the bearing casing.

[0015] An aircraft engine comprises an aircraft engine lubricating oil pipe installation structure.

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

[0017] This structure opens a positioning hole on the outer casing whose diameter is larger than that of the first pipe joint, so that the first pipe joint on the oil pipe still 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, providing space for the subsequent connection of the second pipe joint with the bearing casing, so that the two ends of the oil pipe can be connected at any position of the outer casing and the bearing casing, so that 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 restricted by the oil pipe, which provides more design space for the internal structural design of the outer casing and the inner casing, so that the structural design can be more reasonable.

[0018] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

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

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

[0022] Figure 3 It is a schematic diagram of the splitting of the first connection structure in the present invention.

[0023] Figure 4 It is a schematic diagram of the prior art.

[0024] Legend:

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

[0026] The embodiments of the present invention are 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] See also Figure 1-4The present invention provides a technical solution: an aircraft engine oil pipe installation structure, used for installing the oil pipe 11 between the outer casing 6 and the bearing casing 7, comprising a first connection structure provided at the first end of the oil pipe 11 and a second connection structure provided 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 respectively through the first connection structure and the second connection structure, the first end of the oil pipe 11 is fixedly provided with a first pipe joint 12 for connecting to an external oil pipeline 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 channel in the bearing casing 7, so as to transport the oil from the external oil pipeline to the internal oil channel through the oil pipe 11;

[0028] 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 located in the positioning hole 63, and the first connection structure includes a first fastener 14 and a second fastener 4, both of which are threadedly engaged with the first pipe joint 12, and the first fastener 14 and the second fastener 4 are used to clamp the inner surface and the outer surface of the outer casing 6 to fix the first pipe joint 12 in the positioning hole 63;

[0029] When in use, first remove the second fastener 4 on the first pipe joint 12, and move the first fastener 14 on the first pipe joint 12 to the second pipe joint 13, and then insert the first pipe joint 12 into the positioning hole 63 from between the outer casing 6 and the bearing casing 7. Since the diameter of the positioning hole 63 is larger than the diameter of the first pipe joint 12, the first pipe joint 12 still has six degrees of freedom after the first pipe joint 12 is inserted into the positioning hole 63. The first pipe joint 12, the second pipe joint 13 and the lubricating oil pipe 11 can move freely within a certain range. At this time, the second pipe joint 13 can be connected to the internal lubricating oil channel opened in the bearing casing 7 by moving the second pipe joint 13, and then the second pipe joint 13 can be fixed to the bearing casing 7 through the second connecting structure. After the bearing casing 7 is fixed, the first fastener 14 is moved on a pipe joint 12 toward the direction close to the outer casing 6 and fits with the inner surface of the outer casing 6, and then the second fastener 4 is threadedly engaged with the first pipe joint 12, and the second fastener 4 is rotated to press the second fastener 4 against the outer surface of the outer casing 6, so that the first pipe joint 12 is fixed in the positioning hole 63, and the installation of the lubricating oil pipe 11 between the outer casing 6 and the bearing casing 7 is completed. The end of the first pipe joint 12 extending out of the outer casing 6 can be connected to the external lubricating oil pipeline, and finally the lubricating oil passes through the first pipe joint 12, the lubricating oil pipe 11 and the second pipe joint 13 and enters the lubricating oil channel inside the bearing casing 7. By setting the diameter of the positioning hole 63 on the outer casing 6 for installing the lubricating oil pipe 11 to be larger than the diameter of the first pipe joint 12, the first pipe joint 12 on the lubricating oil pipe 11 still has six degrees of freedom after being inserted into the positioning hole 63, so that the lubricating oil pipe 11 can have a certain adjustment space between the outer casing 6 and the bearing casing 7, and the second pipe joint 13 is connected to the internal lubricating oil channel in the bearing casing 7 by adjusting the lubricating oil pipe 11. When the lubricating oil pipe 11 needs to be twisted, a feasible solution is provided for the installation of the lubricating oil pipe 11, so that the position design of the positioning hole 63 on the outer casing 6 and the installation hole for oil inlet opened on the bearing casing 7 is no longer restricted by the lubricating oil pipe 11, and there are fewer restrictions when designing the internal structure of the outer casing 6;

[0030] The present structure provides a positioning hole 63 with a diameter larger than that of the first pipe joint 12 on the outer casing 6, so that the first pipe joint 12 on the lubricating oil pipe 11 has six degrees of freedom after being inserted into the positioning hole 63. Within a certain range, the position and angle of the lubricating oil pipe 11 can be adjusted at will, providing space for the subsequent connection of the second pipe joint 13 with the bearing casing 7, so that the lubricating oil pipe 11 can be bent and deformed at will, so that 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 are no longer restricted by the lubricating oil pipe 11, so that the internal structural design of the outer casing 6 and the inner casing can be more reasonable;

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

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

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

[0034] Further, 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 threadedly engaged with the first thread 121 and the second thread 123 on the outer surface of the first pipe joint 12, respectively;

[0035] Furthermore, in some examples, a third thread 141 is provided in the inner cavity of the first fastener 14 , and the first fastener 14 is engaged with an external thread provided 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 connection 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, the diameter of the outer cylindrical surface 22 matches the diameter of the positioning hole 63, and the height of the positioning pin ring 2 does not exceed the depth of the positioning hole 63, thereby, the positioning pin ring 2 can be sleeved on the first pipe joint head, after the second pipe joint 13 is installed, it is necessary to fix the first pipe joint 12 and the positioning hole 63 opened in the outer casing 6, and when fixing the first pipe joint 12, the positioning pin ring 2 can be sleeved on the first pipe joint head so that the positioning pin ring 2 is in the positioning hole 63, because 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 in the positioning hole 63, the outer diameter of the positioning pin ring 2 The cylindrical surface 22 can be in close contact with the inner surface of the positioning hole 63, so that the positioning pin ring 2 only has the freedom to move axially along the positioning hole 63. Because the positioning pin ring 2 is sleeved on the first pipe joint 12, the pipe joint will also only have the freedom to move axially along the positioning hole 63. At this time, the first pipe joint head is fixed in the positioning hole 63 by the first fastener 14 and the second fastener 4, and the first pipe joint 12 will be completely fixed in the positioning hole 63. At the same time, because 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 be ensured that the first pipe joint 12 will not shake during subsequent use, so as to improve the stability of the first pipe joint 12 after being fixed in the positioning hole 63 through the first connecting structure, improve the safety of the use of the lubricating oil pipe 11, and improve the safety of the lubricating oil system.

[0037] like Figure 1 As shown, a conical end 124 is provided at one end of the first pipe joint 12 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 conical end 124;

[0038] like Figure 2 As shown, in some examples, a positioning ring 122 is provided on the surface of the first pipe joint 12, and the outer diameter of the positioning ring 122 matches 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 limited 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 positioning 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 positioning pin ring 2 is located between the first fastener 14 and the second fastener 4;

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

[0041] like Figure 3 As shown, in other examples, the outer cylindrical surface 22 of the positioning pin ring 2 is provided with an outer convex portion, and the projection of the outer convex portion in the axial direction of the first pipe joint 12 has a portion that exceeds the opening of the positioning hole 63, so that the positioning pin ring 2 can be abutted on the outer casing 6 through the outer convex portion, and the first fastener 14 and the second fastener 4 are brought close to each other, and the outer convex portion of the positioning pin ring 2 is also pressed against the outer casing 6 by the first fastener 14 or the second fastener 4, which can also prevent the positioning pin ring 2 from moving axially along 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 also facilitate the removal of the positioning pin ring 2 from the positioning hole 63;

[0042] Furthermore, the outer convex portion of the outer cylindrical surface 22 of the positioning pin ring 2 is arranged on the side of the positioning pin ring 2 close to the second fastener 4. During the installation of the lubricating oil pipe 11, it is necessary to install the second pipe joint 13 in place after the first pipe joint 12 is inserted into the positioning hole 63. In this process, in order to allow the lubricating oil pipe 11 to be adjusted at will, the positioning pin ring 2 cannot enter the positioning hole 63, and the outer convex portion of the outer cylindrical surface 22 of the positioning pin ring 2 is arranged on the side of the positioning pin ring 2 close to the second fastener 4. After the second pipe joint head is installed, the positioning pin ring 2 can be installed on the first pipe joint 12 from the end of the first pipe joint head extending from the outer casing 6. After the positioning pin ring 2 is installed, the second fastener 4 is installed, so that the installation process can be simpler.

[0043] Optionally, in some examples, if the outer cylindrical surface 22 of the positioning pin ring 2 is provided with an outer convex portion and the outer convex portion is provided on the side of the positioning pin ring 2 close to the second fastener 4, then the projection of the second fastener 4 in the axial direction of the first pipe joint 12 may be smaller than the positioning hole 63, such as Figure 3 As shown, the second fastener 4 is a hexagonal nut, which 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, and cooperates with the first fastener 14 to press against the inner surface of the outer casing 6, which can also achieve the fixation of the first pipe joint 12 in the positioning hole 63.

[0044] like Figure 3As shown, in some examples, an anti-rotation groove 143 is provided at one end of the first fastener 14 facing the positioning pin ring 2, and an anti-rotation tooth 23 for snapping into the anti-rotation groove 143 is provided on the side of the positioning pin ring 2 facing the first fastener 14. The relative rotation between the first fastener 14 and the positioning pin is limited by the anti-rotation tooth 23 snapping into the anti-rotation groove 143. A stopping groove 24 is provided on the side of the positioning pin ring 2 facing the second fastener 4. A stopping washer 3 is provided between the positioning pin ring 2 and the second fastener 4. A stopping tooth 32 for snapping into the stopping groove 24 is provided on the side of the stopping washer 3. The relative rotation between the stopping washer 3 and the positioning pin ring 2 is limited by the stopping tooth 32 snapping into the stopping groove 24. At least one locking ear 31 is fixedly provided on the side of the stopping washer 3. The projection of the second fastener 4 in the axial direction of the first pipe joint 12 is a polygon. The locking ear 31 can be bent and tightly attached to the side of the second fastener 4 under the action of external force. The first fastener 14 and the second fastener 4 are locked in a step-by-step manner so that the first fastener 14 and the second fastener 4 cannot rotate relative to each other. At this time, the first fastener 14 and the second fastener 4 can only maintain synchronous rotation. When the first fastener 14 and the second fastener 4 have the same thread rotation direction, the first fastener 14 and the second fastener 4 rotate synchronously, which 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 respectively pressed on the inner surface and the outer surface of the outer casing 6, 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, preventing the first fastener 14 or the second fastener 4 from loosening, and effectively improving the stability of the first pipe joint 12 during use.

[0045] During use, first, the first fastener 14 is pressed against the inner surface of the outer casing 6, and then the positioning pin ring 2 is placed in the positioning hole 63. When placing the positioning pin ring 2, the anti-rotation tooth 23 of the positioning pin ring 2 is aligned with the anti-rotation groove 143 provided in the first fastener 14, so that the anti-rotation tooth 23 can be inserted into the anti-rotation groove 143 provided in the first fastener 14, and then the stop washer 3 is placed on the positioning pin ring 2. Similarly, when preventing the stop washer 3, the stop tooth 32 on the stop washer 3 is aligned with the stop groove 24 provided in the positioning pin ring 2, so that the stop tooth 32 can be accurately Insert it accurately into the stopping groove 24, and finally tighten the second fastener 4, and press the stopping washer 3 through the second fastener 4, and at the same time make the outer protrusion pressed against the outer surface of the outer casing 6, and finally, bend the locking ear 31 on the stopping washer 3 toward the second fastener 4, and fit tightly against the side of the second fastener 4, thereby limiting the relative rotation among the second fastener 4, the stopping washer 3, the locating pin ring 2 and the first fastener 14, and realize locking step by step along the axial direction of the first pipe joint 12, and finally achieve the effect of limiting the relative rotation between the first fastener 14 and the second fastener 4.

[0046] Furthermore, in some examples, the outer diameter of the first pipe joint 12 is the same as the outer diameter of the lubricating oil tube 11, so that the first fastener 14 can be moved from the first pipe joint 12 to the lubricating oil tube 11. When the first pipe joint 12 is inserted into the positioning hole 63 and the second pipe joint 13 is connected to the bearing casing 7, the first pipe joint 12 may need to be tilted and moved axially in the positioning hole 63. In order to prevent the first fastener 14 from affecting the range of motion of the first pipe joint 12, the first fastener 14 can be withdrawn to the lubricating oil tube 11, so that the first fastener 14 is away from the positioning hole 63, so that the first fastener 14 will not affect the adjustment of the lubricating oil tube 11.

[0047] Further, such as Figure 1 As shown, a mounting hole for inserting the second pipe joint 13 is provided on the surface of the bearing casing 7, and an oil pipe joint 133 for inserting into the mounting hole is provided on the second pipe joint 13, and a sealing ring mounting groove 134 is provided on the outer surface of the oil pipe joint 133, and a sealing ring 5 is installed in the sealing ring mounting groove 134 to seal the gap between the oil pipe joint 133 and the mounting hole when the oil pipe joint 133 is inserted into the mounting hole;

[0048] When installing the second pipe joint 13, insert the second pipe joint 13 into the mounting hole provided in the bearing casing 7, so that the second pipe joint 13 is connected with the internal lubricating oil pipe 11 in the bearing casing 7, and at the same time, the gap between the oil pipe joint 133 and the mounting hole is sealed by the sealing ring 5 installed on the outer surface of the oil pipe joint 133 to prevent the leakage of lubricating oil;

[0049] like Figure 1-2 As shown, in some examples, the second connection structure includes a connection flange 131 fixedly mounted on the outer surface of the second pipe joint 13, and a threaded hole for installing the connection flange 131 is provided on the outer surface of the bearing casing 7. When installing the second pipe joint, the oil pipe joint 133 on the second pipe joint 13 is first inserted into the mounting hole provided in the bearing casing 7. At this time, the connection flange 131 on the second pipe joint 13 just fits the outer surface of the bearing casing 7, and then bolts are passed through the connection flange 131 and engage with the threaded holes provided in the bearing casing 7 to achieve fixed installation of the second pipe joint on the bearing casing 7.

[0050] Further, such as Figure 2 As shown, in some examples, a first end face 125 is provided on the first pipe joint 12, 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, and a second end face 132 is provided on the second pipe joint 13, 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 is provided with 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 against the first positioning surface 61, and the outer convex portion of the outer cylindrical surface 22 of the positioning pin ring 2 is pressed against the second positioning surface 62 to achieve the fixation of the first pipe joint 12 in the positioning hole 63.

[0052] An aircraft engine comprises the above-mentioned aircraft engine lubricating oil pipe installation structure.

[0053] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An aircraft engine oil pipe installation structure, used for installing an oil pipe (11) between an outer casing (6) and a bearing casing (7), comprising a first connection structure provided at a first end of the oil pipe (11) and a second connection structure provided 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) through the first connection structure and the second connection structure, respectively, and characterized in that: A first pipe joint (12) is fixedly provided at the first end of the lubricating oil pipe (11) for connecting to an external lubricating oil pipeline outside the outer casing (6), and a second pipe joint (13) is fixedly provided at the second end of the lubricating oil pipe (11) for connecting to an internal lubricating oil passage in the bearing casing (7), so that lubricating oil is transported 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 the positioning hole (63) being larger than the diameter of the first pipe joint (12), so that the first pipe joint (12) has six degrees of freedom when located in the positioning hole (63); The first connection structure comprises a first fastener (14) and a second fastener (4), wherein the first fastener (14) and the second fastener (4) are both threadedly engaged with the first pipe joint (12); The first fastener (14) and the second fastener (4) are used to clamp the inner surface and the outer surface of the outer casing (6) to fix the first pipe joint (12) in the positioning hole (63).

2. The aircraft engine oil pipe installation structure according to claim 1, characterized in that: The first connection structure further comprises a positioning pin ring (2) provided on the first pipe joint (12), the inner diameter of the positioning pin ring (2) matches the outer diameter of the first pipe joint (12), the outer diameter of the positioning pin ring (2) matches the diameter of the positioning hole (63), and the height of the positioning pin ring (2) does not exceed the depth of the positioning hole (63), and the first fastener (14), the positioning pin ring (2) and the second fastener (4) are arranged in sequence on the first pipe joint (12) along the axial direction of the first pipe joint (12).

3. The aircraft engine oil pipe installation structure according to claim 2, characterized in that: The height of the positioning pin ring (2) is consistent with the depth of the positioning hole (63), so that both ends of the positioning pin ring (2) can contact the first fastener (14) and the second fastener (4) at the same time.

4. The aircraft engine oil pipe installation structure according to claim 2, characterized in that: One end of the positioning pin ring (2) is provided with an outer convex portion, and the projection of the outer convex portion in the axial direction of the first pipe joint (12) has a portion exceeding the opening of the positioning hole (63), so that the positioning pin ring (2) can abut against the outer surface of the outer casing (6) through the outer convex portion.

5. The aircraft engine oil pipe installation structure according to claim 4, characterized in that: The outer protrusion is fixedly arranged on one end of the positioning pin ring (2) close to the second fastener (4).

6. The aircraft engine oil pipe installation structure according to claim 4, characterized in that: An anti-rotation groove (143) is provided at one end of the first fastener (14) facing the positioning pin ring (2), and an anti-rotation tooth (23) for being inserted into the anti-rotation groove (143) is provided at one side of the positioning pin ring (2) facing the first fastener (14), so that the relative rotation between the first fastener (14) and the positioning pin is limited by the anti-rotation tooth (23) being inserted into the anti-rotation groove (143); A stop groove (24) is provided on the side of the positioning pin ring (2) facing the second fastener (4); a stop washer (3) is provided between the positioning pin ring (2) and the second fastener (4); a stop tooth (32) for snapping into the stop groove (24) is provided on the side of the stop washer (3); the stop tooth (32) is snapped into the stop groove (24) to limit the relative rotation between the stop washer (3) and the positioning pin ring (2); At least one locking ear (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 a polygon; the locking ear (31) can be bent and closely attached to the side of the second fastener (4) under the action of an external force, so as to limit 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.

7. The aircraft engine oil pipe installation structure 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).

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

9. The aircraft engine oil pipe installation structure according to claim 1, characterized in that: The second connection structure comprises a connection flange (131) fixedly mounted on the outer surface of the second pipe joint (13), and a threaded hole for mounting the connection flange (131) is provided on the outer surface of the bearing casing (7).

10. An aircraft engine, characterized in that: The invention comprises the aircraft engine oil pipe installation structure as described in any one of claims 1 to 9.

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