External oil pipe structure of tilting speed reducer, tilting speed reducer and tilting rotorcraft

Abstract

The utility model relates to an external oil pipe structure of a tilting speed reducer, the tilting speed reducer and a tilting rotorcraft, belongs to the technical field of aircrafts, and solves the problem that in the prior art, when the distance between the tilting speed reducer and a radiator is long, a lubricating oil way is difficult to arrange. The first ends of the oil supply pipe and the oil return pipe are connected with a tilting speed reducer, and the second ends of the oil supply pipe and the oil return pipe are connected with a radiator; the oil supply pipe and the oil return pipe are fixed on a body support of the tilt rotorcraft at the middle point position between the first end and the second end; the oil supply pipe and the oil return pipe are both polytetrafluoroethylene hoses or corrugated pipes; wherein the parts from the first ends to the middle points of the oil supply pipe and the oil return pipe rotate along with the rotation of the tilting speed reducer, and the parts from the second ends to the middle points of the oil supply pipe and the oil return pipe are kept relatively static with the machine body support. According to the utility model, the hose is used as the lubricating oil pipe and is fixed at different positions in a sectional manner, so that the problem that a lubricating oil way is difficult to arrange is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of aircraft, in particular to an external oil pipe structure of a tilting reducer, a tilting reducer and a tiltrotor aircraft. Background Technique

[0002] A tiltrotor aircraft is a current aircraft based on a new configuration principle, and is a new concept aircraft between a helicopter and a fixed-wing aircraft. When the rotor tilting system assembly is in the vertical position, the tiltrotor aircraft is similar to a tandem helicopter with two rotors, and can hover, fly sideways, fly backward, and take off and land vertically, eliminating the need for a takeoff and landing runway. When the rotor tilting system assembly is in the horizontal position, the tiltrotor aircraft is equivalent to a fixed-wing aircraft and can fly at high speed over long distances, increasing the flight envelope. Its excellent performance has attracted the attention of various experts in the aviation field. Based on its configuration principle, the tilting reducer of its transmission system should also have these two modes during flight. To adapt to the special working mode and structural changes of the tiltrotor aircraft, the oil supply pipeline may need to adopt flexible connection or a specially designed pipeline routing to ensure the continuity and stability of oil supply during the tilting process of the rotor.

[0003] This requirement increases the difficulty of design, manufacturing and maintenance. A complex oil supply pipeline system may increase the failure points, such as pipeline rupture, joint loosening, filter clogging, etc., thus affecting the reliability and stability of the lubrication system. When designing a tiltrotor aircraft, it is also necessary to comprehensively consider the weight and space limitations, and the layout of the oil supply pipeline may be restricted by these factors, affecting the optimization and performance of the system. Especially when the distance between the tilting reducer of the transmission system and the radiator is relatively far, since the radiator does not rotate with the tilting reducer, it is difficult to arrange the lubricating oil pipeline between the two, and problems such as fatigue deformation, rupture, and joint loosening are likely to occur. Content of the Utility Model

[0004] In view of the above analysis, the embodiments of the utility model aim to provide an external oil pipe structure of a tilting reducer, a tilting reducer and a tiltrotor aircraft, so as to solve the problem that it is difficult to arrange the lubricating oil pipeline when the distance between the tilting reducer of the transmission system and the radiator is relatively far.

[0005] On the one hand, the utility model provides an external oil pipe structure for a tilting reducer of a tilt-rotor aircraft, including an oil supply pipe and an oil return pipe. The first end of the oil supply pipe is connected to the tilting reducer, and the second end of the oil supply pipe is connected to a radiator; the first end of the oil return pipe is connected to the tilting reducer, and the second end of the oil return pipe is connected to the radiator; the oil supply pipe is provided with an oil supply pipe fixing part, and the part between the first end of the oil supply pipe and the oil supply pipe fixing part can move synchronously with the rotation of the tilting reducer; the oil return pipe is provided with an oil return pipe fixing part, and the part between the first end of the oil return pipe and the oil supply pipe fixing part can move synchronously with the rotation of the tilting reducer.

[0006] Further, the oil supply pipe is connected to the tilting reducer through a 90° or 135° elbow joint, and the oil return pipe is connected to the tilting reducer through a 90° or 135° elbow joint.

[0007] Further, it further includes an automatic hose reel. The automatic hose reel is used for winding the part between the first end of the oil supply pipe and the oil supply pipe fixing part and the part between the first end of the oil return pipe and the oil return pipe fixing part, and the remaining parts of the oil supply pipe and the oil return pipe are led out from the bottom of the automatic hose reel.

[0008] Further, the automatic hose reel can automatically tighten the part between the first end of the oil supply pipe and the oil supply pipe fixing part and the part between the first end of the oil return pipe and the oil return pipe fixing part.

[0009] Further, it further includes a first bracket, and both the oil supply pipe and the oil return pipe are fixedly connected to the first bracket.

[0010] Further, it further includes a second bracket; after passing through the first bracket, both the oil supply pipe and the oil return pipe are fixedly connected to the second bracket. The oil supply pipe fixing part is located at the connection point between the oil supply pipe and the second bracket, and the oil return pipe fixing part is located at the connection point between the oil return pipe and the second bracket.

[0011] Further, the connection points of the oil supply pipe and the oil return pipe with the second bracket are adjacent to or located on the axis of the return rotation shaft of the tilting reducer.

[0012] On the other hand, the utility model provides a tilting reducer for a tilt-rotor aircraft, including the external oil pipe structure as described above.

[0013] On the other hand, the utility model further provides a tilt-rotor aircraft, including the tilting reducer as described above.

[0014] The advantage of the present application is that it provides several external oil circuit solutions for the drive system of tilt-rotor configuration aircraft, which can solve the dilemma of inconvenient connection and layout of the lubricating oil circuit when the distance between the tilt-reducer and the radiator in the drive system is relatively far. It can ensure the stable and long-term operation of the lubricating system of the tilt-reducer, and enhance its service and maintenance performance.

[0015] In the present utility model, the above technical solutions can also be combined with each other to achieve more preferred combination schemes. Other features and advantages of the present utility model will be described in the subsequent description. Moreover, some advantages can be made obvious from the description, or can be understood by implementing the present utility model. The objectives and other advantages of the present utility model can be achieved and obtained from the content specifically pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings are only for the purpose of showing specific embodiments, and are not considered as a limitation to the present utility model. Throughout the drawings, the same reference signs denote the same components.

[0017] Figure 1 It is a schematic structural diagram in the level flight mode of Embodiment 1 of the present utility model;

[0018] Figure 2 It is a schematic structural diagram in the helicopter mode of Embodiment 1 of the present utility model;

[0019] Figure 3 It is a schematic structural diagram in the level flight mode of Embodiment 2 of the present utility model;

[0020] Figure 4 It is a schematic structural diagram in the level flight mode of Embodiment 3 of the present utility model;

[0021] Figure 5 It is a schematic structural diagram in the level flight mode of Embodiment 4 of the present utility model.

[0022] REFERENCE SIGNS:

[0023] 1 - tilt-reducer; 2 - airframe support; 3 - radiator; 4 - supply oil pipe; 5 - return oil pipe; 6 - automatic hose reel; 7 - first bracket; 8 - second bracket. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following will specifically describe the preferred embodiments of the present utility model in conjunction with the drawings. Among them, the drawings form a part of the present utility model and are used together with the embodiments of the present utility model to explain the principle of the present utility model, rather than to limit the scope of the present utility model.

[0025] Embodiment 1

[0026] A specific embodiment of the present utility model, such asFigure 1 , Figure 2 As shown in Figure 2 , an external oil pipe structure of a tilting speed reducer of a tilt-rotor aircraft is disclosed.

[0027] In the transmission system of a tilt-rotor aircraft, a part is a tilting speed reducer 1. During the operation of the aircraft, the tilting speed reducer 1 is fixed on the airframe support 2 and rotates at a certain angle around the rotation center of the airframe support 2. In the layout of the airframe, when the radiator 3 is far away from the tilting speed reducer 1 and it is impossible to use a cast oil circuit for pipeline connection, the tilting movement of the tilting speed reducer 1 is likely to cause movement interference or fatigue rupture and other failures in the oil circuit between the tilting speed reducer 1 and the radiator 3.

[0028] An external oil pipe structure of a tilting speed reducer of a tilt-rotor aircraft in Embodiment 1 includes an oil supply pipe 4 and an oil return pipe 5. The oil supply pipe 4 is connected to the tilting speed reducer 1 at the first end (i.e., point A in the figure) and to the radiator 3 at the second end (i.e., point C in the figure). An oil supply pipe fixing part is provided in the middle part (i.e., point B in the figure) between the first end and the second end of the oil supply pipe 4, and it is fixed on the airframe support 2 of the tilt-rotor aircraft through the oil supply pipe fixing part. The oil supply pipe 4 is made of polytetrafluoroethylene hose or bellows. Among them, the first end of the oil supply pipe 4 to the oil supply pipe fixing part (i.e., section AB) rotates with the rotation movement of the tilting speed reducer 1, and the second end of the oil supply pipe 4 to the oil supply pipe fixing part (i.e., section BC) remains relatively stationary with respect to the airframe support 2.

[0029] The oil return pipe 5 is connected to the tilting speed reducer 1 at the first end (i.e., point A in the figure) and to the radiator 3 at the second end (i.e., point C in the figure). An oil return pipe fixing part is provided in the middle part (i.e., point B in the figure) between the first end and the second end of the oil return pipe 5, and it is fixed on the airframe support 2 of the tilt-rotor aircraft through the oil return pipe fixing part. The oil return pipe 5 is made of polytetrafluoroethylene hose or bellows. Among them, the first end of the oil return pipe 5 to the oil return pipe fixing part (i.e., section AB) rotates with the rotation movement of the tilting speed reducer 1, and the second end of the oil return pipe 5 to the oil return pipe fixing part (i.e., section BC) remains relatively stationary with respect to the airframe support 2.

[0030] The oil supply pipe 4 and the oil return pipe 5 are connected to the tilting speed reducer 1 through 90° or 135° elbow joints. The oil supply pipe 4 and the oil return pipe 5 between the tilting speed reducer 1 and the radiator 3 are made of polytetrafluoroethylene hose or bellows. On the side of the tilting speed reducer 1, due to the large bending radius of the oil pipe, when it is difficult to arrange a straight-through pipe joint for the indirect connection between the tilting speed reducer 1 and the lubricating oil pipe, 90° or 135° elbow joints can be used. In Embodiment 1, the hose near the tilting speed reducer 1 end rotates with the movement of the tilting speed reducer 1, and the hose near the radiator 3 end remains relatively stationary.

[0031] Through Embodiment 1 of the present utility model, by using a polytetrafluoroethylene hose or a corrugated pipe as the fuel supply pipe 4 and the return pipe 5, the rotation of the tilting reducer 1 can be adapted to the greatest extent, avoiding fatigue damage to the oil pipe and thus preventing rupture. At the same time, the oil pipe is fixed in a segmented manner to avoid movement interference and ensure the stable operation of the equipment.

[0032] Embodiment 2

[0033] Refer to Figure 3 , on the basis of Embodiment 1, the external oil pipe structure of the tilting reducer of the tilt-rotor aircraft in this Embodiment 2 further includes an automatic hose reel 6, and the automatic hose reel 6 is arranged on one side of the pipeline of the fuel supply pipe 4 and the return pipe 5 close to the tilting reducer 1. The automatic hose reel 6 is preferably fixedly connected to the airframe. The automatic hose reel 6 is used to wind the first end to the middle part (i.e., the AB section) of the fuel supply pipe 4 and the return pipe 5, and the remaining parts (i.e., the BC section) of the fuel supply pipe 4 and the return pipe 5 are led out from the bottom of the automatic hose reel 6. The fuel supply pipe fixing part and the return pipe fixing part are arranged at the leading-out position at the bottom of the automatic hose reel 6 or adjacent to this leading-out position.

[0034] Furthermore, the fuel supply pipe and the return pipe are wound around the automatic hose reel 6 for 1 - 2 turns.

[0035] Since the length of the oil pipe at the end close to the tilting reducer 1 changes in different postures of the tilting reducer 1. Generally, the length of the oil pipe at the end close to the tilting reducer 1 is longer in the level flight state, and the length of the oil pipe at the end close to the tilting reducer 1 is shorter in the helicopter state. Therefore, the oil pipe is prone to bending in the helicopter state, and its fatigue performance is easily affected. Therefore, in this Embodiment 2, an automatic hose reel 6 is added at the oil pipe on the side close to the tilting reducer 1, so that the pipeline in different postures can be tightened in the automatic hose reel 6 without causing damage to the pipeline due to bending.

[0036] In Figure 1 、 2 the shown scheme, the lengths of the oil pipes from the first end to the middle part (i.e., the AB section) are equal. In Figure 1 the level flight state, the length of the oil pipe from its first end to the middle part (i.e., the AB section) is appropriate. However, in Figure 2 the helicopter state, the straight-line distance between points A and B is shortened, causing a certain degree of bending of the oil pipe from its first end to the middle part (i.e., the AB section), which affects the fatigue performance of the oil pipe. Therefore, in Figure 3 the second scheme shown, an automatic hose reel 6 is added between the AB sections of the oil pipe close to the tilting reducer 1, and the oil pipe is wound around the automatic hose reel 6 for 1 - 2 turns. In this way, in the level flight state and the helicopter state, the redundant parts of the AB section oil pipe can be tightened in the automatic hose reel 6 without causing damage to the oil pipe due to bending.

[0037] Embodiment 3

[0038] Refer to Figure 4 , on the basis of Embodiment 1, the external oil pipe structure of the tilting reduction gear of the tiltrotor in this Embodiment 3 further includes a first bracket 7. The first bracket 7 is fixedly arranged on the tilting reduction gear 1, and the oil supply pipe 4 and the oil return pipe 5 are fixedly connected to the first bracket 7, and the connection point is D.

[0039] Furthermore, it further includes a second bracket 8. The second bracket 8 is fixedly arranged on the body support 2. After the oil supply pipe 4 and the oil return pipe 5 pass through the first bracket 7, they are fixedly connected to the second bracket 8, and the connection point is B. The oil supply pipe fixing part is located at the connection point (i.e., point B) of the oil supply pipe 4 and the second bracket 8, and the oil return pipe fixing part is located at the connection point (i.e., point B) of the oil return pipe 5 and the second bracket 8.

[0040] Preferably, the connection points of the oil supply pipe 4 and the oil return pipe 5 with the second bracket 8 are adjacent to or located on the axis of the rotation shaft of the tilting reduction gear 1.

[0041] Furthermore, both the oil supply pipe 4 and the oil return pipe 5 are fixed by clamps.

[0042] Since the force generated by the movement of the oil pipe part rotating with the tilting reduction gear 1 is concentrated at the joint between the oil pipe part and the tilting reduction gear 1, the stability of the joint will be greatly affected, thus shortening the maintenance period and replacement period of the oil pipe. Therefore, in this Embodiment 3, two brackets are added as the fixing points of the lubricating oil pipe. The first bracket 7 is fixed on the tilting reduction gear 1 and moves synchronously with the tilting movement of the tilting reduction gear 1. The second bracket 8 is fixed on the body support 2 and always remains relatively stationary. At the same time, the oil pipe part rotating with the tilting reduction gear 1 is as close as possible to the rotation axis of the tilting reduction gear 1 at the connection point of the second bracket 8. The advantage is that the length required for the oil pipe section between the first bracket 7 and the second bracket 8 at each angle during the tilting process can be basically the same, thus avoiding the situation of being sometimes tight and sometimes loose, which is beneficial to the smoothness and stability of the oil circuit.

[0043] Embodiment 4

[0044] Refer to Figure 5 , on the basis of Embodiment 3, in the external oil pipe structure of the tilting reduction gear of the tiltrotor in this Embodiment 4, the oil supply pipe 4 and the oil return pipe 5 adopt metal oil pipes between the tilting reduction gear 1 and the first bracket 7, the oil supply pipe 4 and the oil return pipe 5 adopt metal oil pipes between the second bracket 8 and the radiator 3, and a hose or corrugated pipe is used to connect between the first bracket 7 and the second bracket 8.

[0045] In Embodiment 3, the lubricating oil pipe is connected by a polytetrafluoroethylene hose or a corrugated pipe. When it is installed in the body, it needs to be fixed in multiple places by clamps or other forms to prevent its movement from affecting other components. And under the same pressure and temperature conditions, the wall thickness of the metal oil pipe is 1 / 3 to 1 / 2 smaller than that of the hose, and the required space is smaller. Therefore, in Embodiment 4, metal oil pipes are used to connect between the tilting reducer 1 and the first bracket 7, and between the second bracket 8 and the radiator 3, and hoses or corrugated pipes are used to connect between the first bracket 7 and the second bracket 8. Such an arrangement can reduce the number of clamps or other forms of fixing devices, and can also reduce the outer diameter of the oil pipe, better adapting to a narrow space.

[0046] In Figure 5 In the shown Embodiment 4, the lubricating oil pipes of the AD section and the BC section are made of metal oil pipes, and the lubricating oil pipe of the DB section is made of a polytetrafluoroethylene hose or a corrugated pipe. This connection method requires less space and has fewer fixing points on the body.

[0047] In addition, the present utility model also provides a tilting reducer for a tiltrotor aircraft, including any one of the external oil pipe structures in Embodiments 1-4.

[0048] The present utility model also provides a tiltrotor aircraft, including the tilting reducer as described above.

[0049] The beneficial effect of the present utility model is that it provides several external oil circuit solutions for the transmission system of tiltrotor configuration aircraft, which can solve the dilemma of inconvenient connection and layout of the lubricating oil circuit when the distance between the tilting reducer and the radiator of the transmission system is relatively far. It can ensure the stable long-term movement of the lubrication system of the tilting reducer and enhance its service and maintenance performance.

[0050] The above is only the preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model.

Claims

1. An external oil pipe structure of a tilting speed reducer, characterized in that It includes an oil supply pipe and an oil return pipe. The first end of the oil supply pipe is connected to the tilting speed reducer, and the second end of the oil supply pipe is connected to the radiator; the first end of the oil return pipe is connected to the tilting speed reducer, and the second end of the oil return pipe is connected to the radiator; the oil supply pipe is provided with an oil supply pipe fixing part, and the part between the first end of the oil supply pipe and the oil supply pipe fixing part can move synchronously with the rotation of the tilting speed reducer; the oil return pipe is provided with an oil return pipe fixing part, and the part between the first end of the oil return pipe and the oil supply pipe fixing part can move synchronously with the rotation of the tilting speed reducer.

2. The external oil pipe structure according to claim 1, characterized in that, The oil supply pipe is connected to the tilting speed reducer through a 90° or 135° elbow joint, and the oil return pipe is connected to the tilting speed reducer through a 90° or 135° elbow joint.

3. The external oil pipe structure according to claim 1, characterized in that, It further includes an automatic hose reel, which is used for winding the part between the first end of the oil supply pipe and the oil supply pipe fixing part and the part between the first end of the oil return pipe and the oil return pipe fixing part, and the remaining parts of the oil supply pipe and the oil return pipe are led out from the bottom of the automatic hose reel.

4. The external oil pipe structure according to claim 3, characterized in that The automatic hose reel can automatically tighten the part between the first end of the oil supply pipe and the oil supply pipe fixing part and the part between the first end of the oil return pipe and the oil return pipe fixing part.

5. The external oil pipe structure according to claim 1, characterized in that, It further includes a first bracket, and both the oil supply pipe and the oil return pipe are fixedly connected to the first bracket.

6. The external oil pipe structure according to claim 5, characterized in that, It further includes a second bracket; after passing through the first bracket, both the oil supply pipe and the oil return pipe are fixedly connected to the second bracket. The oil supply pipe fixing part is located at the connection point between the oil supply pipe and the second bracket, and the oil return pipe fixing part is located at the connection point between the oil return pipe and the second bracket.

7. The external oil pipe structure according to claim 6, characterized in that, The connection points of the oil supply pipe and the oil return pipe with the second bracket are adjacent to or located on the axis of the return shaft of the tilting speed reducer.

8. The external oil pipe structure according to claim 7, characterized in that, The oil supply pipe and the oil return pipe adopt metal oil pipes from the second bracket to the radiator.

9. A tilt reduction gear of a tiltrotor aircraft, characterized in that, It includes an external oil pipe structure according to any one of claims 1 - 8.

10. A tiltrotor aircraft, characterized in that, It includes a tilting speed reducer according to claim 9.

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