Lubricating oil pump, transmission system and tilt rotor aircraft

Abstract

The utility model relates to a lubricating oil pump, a transmission system and a tilt rotor aircraft, belongs to the technical field of aerospace, and solves the problems of complex design and higher cost of the transmission system under the condition that the aircraft simultaneously needs clockwise and anticlockwise lubricating oil pumps. The lubricating oil pump comprises a shell, an inner rotor, an outer rotor and a sliding block. The inner rotor is connected with the rotating shaft; the inner rotor is provided with outer teeth, the outer rotor is provided with inner teeth, the inner teeth are meshed with the outer teeth, and the side wall of the outer rotor is provided with oil outlet holes formed in the circumferential direction. The sliding block is of a cylindrical structure and is arranged between the outer rotor and the shell. The inner edge of the sliding block is provided with a first gap, and the first gap and the outer wall of the outer rotor form a control cavity. According to the lubricating oil pump, the technical effect that the lubricating oil pump needs to rotate clockwise and anticlockwise without changing the oil inlet and the oil outlet can be achieved, and the lubricating oil pump is compact in structure and convenient to mount and dismount.

Description

Technical Field

[0001] This utility model relates to the field of aerospace technology, and in particular to an oil pump, a transmission system, and a tiltrotor aircraft. Background Technology

[0002] Oil pumps play a crucial role in ensuring normal equipment operation, extending service life, and improving system efficiency by providing a stable supply of lubricating oil. Aircraft engines (such as turbojet and turbofan engines) use oil pumps to provide forced lubrication to components like bearings and gearboxes, ensuring normal operation in harsh environments such as high altitudes and high speeds.

[0003] Under normal circumstances, the lubricating oil pump operates in the rotation direction specified in its design. At this time, the direction of rotor movement matches the direction of lubricating oil delivery, enabling normal oil intake and discharge. When the lubricating oil pump rotates in the opposite direction, the lubricating oil flows in reverse, and the functions of the oil inlet and outlet are interchanged.

[0004] Existing tiltrotor aircraft require two symmetrical transmission systems, each containing an oil pump, depending on the aircraft's needs. The input rotation directions of the oil pumps in the two transmission systems are clockwise and counter-clockwise, respectively. Correspondingly, on the one hand, the oil circuitry of the transmission system needs to be redesigned, which is complex; on the other hand, designing two different oil pumps is costly. Utility Model Content

[0005] Based on the above analysis, the present invention aims to provide an oil pump, a transmission system, and a tiltrotor aircraft to solve the problem of complex transmission system design and high cost when the aircraft requires both clockwise and counterclockwise oil pumps.

[0006] The objective of this utility model is mainly achieved through the following technical solutions:

[0007] The first aspect of this utility model is to provide a lubricating oil pump, including a housing, an inner rotor, an outer rotor, and a slider;

[0008] The inner rotor is connected to the rotating shaft; the inner rotor has external teeth, and the outer rotor has internal teeth, which mesh with the external teeth.

[0009] The outer rotor sidewall has an oil outlet hole arranged circumferentially.

[0010] The slider has a cylindrical structure and is disposed between the outer rotor and the housing; the inner edge of the slider has a first notch, and the first notch and the outer wall of the outer rotor form a control cavity.

[0011] Furthermore, the outer edge of the slider also has a second notch; the second notch forms a sliding cavity with the inner wall of the housing.

[0012] Furthermore, the central angle at both ends of the second notch is 180°; the radius from one end of the second notch to the other end is the same.

[0013] Furthermore, the sliding cavity includes a sliding cavity body, a first end, and a second end, with the first end and the second end located at both ends of the sliding cavity body.

[0014] Furthermore, it also includes a positioning pin, which is disposed on the inner wall of the housing and located within the sliding cavity.

[0015] When the positioning pin is located at the first end, the slider is prevented from continuing to rotate in the first direction; when the positioning pin is located at the second end, the slider is prevented from continuing to rotate in the second direction, the first direction and the second direction being opposite.

[0016] Furthermore, the radius of the bottom surface of the first notch gradually decreases from one end to the other, so that the cross-section of the control cavity changes in a gradient from one end to the other.

[0017] Furthermore, it also includes an oil inlet and an oil outlet; the oil inlet and the oil outlet are disposed on the housing;

[0018] The oil inlet is equipped with an oil inlet valve; the oil outlet is equipped with an oil outlet valve; both the oil inlet valve and the oil outlet valve are one-way valves, and the oil inlet valve and the oil outlet valve are in opposite directions.

[0019] Furthermore, the outer rotor rotates eccentrically under the drive of the inner rotor; the inner teeth have one more tooth than the outer teeth.

[0020] A second aspect of this utility model provides a transmission system including the aforementioned lubricating oil pump.

[0021] A third aspect of this utility model provides a tiltrotor aircraft, including the aforementioned transmission system.

[0022] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0023] (1) Compared with the existing technology, which requires changing the connection method when facing a lubricating pump that needs to rotate clockwise and counterclockwise, making the transmission system design complex and costly, this utility model sets a slider between the outer rotor and the housing. The inner side of the slider has a notch, which forms a control cavity with the outer circle of the outer rotor. The outer rotor wall is provided with an oil outlet hole. The lubricating oil enters the control cavity through the oil outlet hole and pushes the slider to rotate by oil pressure. The slider drives the outer rotor to rotate. During the rotation, the eccentric position of the outer rotor and the meshing area between the outer rotor and the inner rotor are changed, so that the meshing area between the outer rotor and the inner rotor changes with the direction of slider rotation. The meshing sequence remains unchanged in different rotation directions. The areas where the meshing cavity volume increases and decreases remain unchanged. The functions of the oil inlet and oil outlet remain unchanged, that is, the oil inlet always receives oil and the oil outlet always discharges oil. For situations requiring different steering oil pumps, this invention eliminates the need for two oil pumps with different steering directions and a complex transmission system. It ensures that the functions of the oil inlet and outlet remain unchanged regardless of whether the oil pump rotates clockwise or counterclockwise. Furthermore, this invention features a simple and compact structure, is easy to install and disassemble, and has low cost, making it widely applicable to lubrication systems.

[0024] (2) The inner wall of the housing and the second notch of the slider form a sliding cavity. The central angle enclosed by the two ends of the sliding cavity is 180°, and the sliding range of the slider is 0°-180°. The housing has a built-in positioning pin, which is fixed inside the housing. The sliding cavity slides with the slider and slides until the positioning pin is located at the first or second end and is limited.

[0025] (3) The inner rotor meshes with the outer rotor. The inner rotor rotates with the shaft, driving the outer rotor to rotate. The outer rotor rotates eccentrically under the drive of the inner rotor, forming an uneven meshing gap and multiple independent, varying sealed chambers. The outer rotor has one more tooth than the inner rotor, so its rotational speed is slower than that of the inner rotor. The outer and inner rotors remain meshed during rotation to prevent lubricating oil backflow. The inner and outer rotors rotate in the same direction but asynchronously to ensure continuous change in the volume of the inter-tooth chambers, achieving continuous oil inlet and outlet, and preventing direct communication between the oil inlet and outlet areas.

[0026] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or be learned by practicing this invention. The objectives and other advantages of this invention can be realized and obtained from the details specifically pointed out in the text and accompanying drawings. Attached Figure Description

[0027] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0028] Figure 1This is an exploded view of the lubricating oil pump in Example 1;

[0029] Figure 2 This is a schematic diagram of the lubricating oil pump in Example 1;

[0030] Figure 3 This is a cross-sectional view of the lubricating oil pump in Example 1;

[0031] Figure 4 This is a schematic diagram of the external rotor in Example 1;

[0032] Figure 5 This is a schematic diagram of the initial structure of the slider in Example 1, where clockwise rotation is switched to counterclockwise rotation.

[0033] Figure 6 This is a schematic diagram of the slider rotating 45° in Example 1;

[0034] Figure 7 This is a schematic diagram of the slider rotating 90° in Example 1;

[0035] Figure 8 This is a schematic diagram of the slider rotating 135° in Example 1;

[0036] Figure 9 This is a schematic diagram of the slider rotating 180° in Example 1.

[0037] Figure label:

[0038] 1-Housing, 11-Oil inlet, 111-Oil inlet valve, 12-Oil outlet, 121-Oil outlet valve, 13-Positioning pin, 2-Inner rotor, 3-Outer rotor, 31-Oil outlet hole, 4-Slider, 41-Control chamber, 42-Sliding chamber, 421-Sliding chamber body, 422-First end, 423-Second end, 5-Shaft, 6-End cover. Detailed Implementation

[0039] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0040] A specific embodiment of this utility model is as follows: Figures 1-3 As shown, a lubricating oil pump is disclosed, including a housing 1, an inner rotor 2, an outer rotor 3, and a slider 4;

[0041] The inner rotor 2 is connected to the rotating shaft 5; the inner rotor 2 has external teeth, the outer rotor 3 has internal teeth, and the inner teeth 2 and the outer teeth 3 mesh with each other;

[0042] The outer rotor 3 has an oil outlet hole 31 arranged circumferentially on its side wall;

[0043] The slider 4 has a cylindrical structure and is located between the outer rotor 3 and the housing 1. The inner edge of the slider 4 has a first notch, which forms a control cavity 41 with the outer wall of the outer rotor 3.

[0044] Specifically, such as Figure 2 and Figure 3 As shown, the inner rotor 2, the outer rotor 3 and the slider 4 are disposed inside the housing 1, and the housing 1 is provided with an end cover 6 on the outside.

[0045] The inner rotor 2 is mounted on the rotating shaft 5 and can rotate with the shaft 5. The inner rotor 2 has external teeth, and the outer rotor 3 has internal teeth; the internal teeth mesh with the external teeth. The outer rotor 3 has one more tooth than the inner rotor 2. The inner rotor 2 rotates at a higher speed than the outer rotor 3. The outer rotor 3 and the inner rotor 2 remain meshed during rotation to prevent lubricating oil backflow. In this embodiment, the outer rotor 3 has 7 teeth, and the inner rotor 2 has 6 teeth.

[0046] The inner rotor 2 is the driving wheel, and the outer rotor 3 is the driven wheel. The inner rotor 2 rotates with the shaft 5, while the outer rotor 3 rotates eccentrically under the drive of the inner rotor 2, creating an uneven meshing gap. This meshing gap forms multiple independent and varying sealed chambers. The inner rotor 2 and the outer rotor 3 rotate in the same direction but asynchronously to ensure continuous change in the volume of the inter-tooth chambers, enabling continuous oil intake and discharge, and preventing direct communication between the oil intake and discharge areas.

[0047] The slider 4 is a cylindrical structure and is positioned between the outer rotor 3 and the housing 1. The outermost sidewall of the slider 4 is in contact with the housing 1 to further prevent lubricating oil leakage. The innermost sidewall of the slider 4 is in contact with the outer rotor 3, and the rotation of the slider 4 can drive the outer rotor 3 to rotate.

[0048] The inner edge of the slider 4 has a first notch, which forms a control cavity 41 with the outer wall of the outer rotor 3. The control cavity 41 is used to contain lubricating oil. When the slider 4 rotates, the first notch rotates coaxially with the slider 4, causing the control cavity 41 and the lubricating oil inside to rotate coaxially with the slider 4.

[0049] Preferably, the first notch is an arc-shaped notch, and the radius of the bottom surface of the first notch gradually decreases from one end to the other end. Therefore, the cross-section of the control cavity 41 formed by the notch changes in a gradient from one end to the other end. The oil pressure inside the control cavity 41 generates a pressure difference, and the oil pressure difference generates a pushing force on the slider 4. The direction of the pushing force is consistent with the direction of rotation, forming a rotational torque, which together with the viscosity of the oil itself between the inner surface of the slider 4 and the outer circular surface of the outer rotor 3, pushes the slider 4 to rotate.

[0050] Furthermore, such as Figure 4 As shown, multiple oil outlet holes 31 are provided circumferentially on the side wall of the outer rotor 3, which are used to allow oil to enter the control chamber 41 to drive the slider 4 to rotate.

[0051] The outer edge of the slider 4 also has a second notch, the central angles corresponding to the two ends of the second notch are 180°, and the radius from one end of the second notch to the other end is the same. A sliding cavity 42 is formed between the second notch and the inner wall of the housing 1. The outermost outer wall surface of the slider 4 is in contact with the inner wall surface of the housing 1, and the rotation axis of the slider 4 coincides with the rotation axis of the inner rotor 2.

[0052] Preferably, the second notch is an arc-shaped notch, and the radius from one end of the second notch to the other end is the same, so the width of the sliding cavity 42 is the same. Furthermore, the central angles corresponding to the two ends of the second notch are 180°, so the rotation direction changes after the slider 4 rotates 180°.

[0053] Specifically, the sliding cavity 42 includes a sliding cavity body 421, a first end 422, and a second end 423. The first end 422 is a first limiting position, and the second end 423 is a second limiting position.

[0054] Furthermore, it also includes a positioning pin 13 for limiting the sliding of the slider 4. The positioning pin 13 is disposed on the inner wall of the housing 1 and located in the sliding cavity 42 formed by the inner wall of the housing 1 and the outer edge of the slider 4. The sliding cavity 42 slides with the slider 4. When the slider 4 slides to the first end 422 of the sliding cavity 42, the slider 4 abuts against the positioning pin 13, and the slider 4 cannot continue to rotate in the first direction; this is the first limiting position. When the slider 4 slides to the second end 423 of the sliding cavity 42, the slider is prevented from continuing to rotate in the second direction, the slider 4 abuts against the positioning pin 13, and the slider 4 cannot continue to rotate; this is the second limiting position. The first direction and the second direction are opposite.

[0055] Furthermore, it also includes an oil inlet 11 and an oil outlet 12. The oil inlet 11 and oil outlet 12 are located on the housing 1, corresponding to the oil inlet area and the oil outlet area, respectively. To address the issue of the oil inlet 11 and oil outlet 12 replacing each other during the rotation of the slider 4, an oil inlet valve 111 is provided for the oil inlet 11, and an oil outlet valve 121 is provided for the oil outlet 12. Both the oil inlet valve 111 and the oil outlet valve 121 are one-way valves, and their directions are opposite.

[0056] Both the inlet valve 111 and the outlet valve 121 include a base, a valve core, a spring, and a valve body. The valve core is housed within the valve body and has a tapered end at the top and a stem portion. The tapered end abuts against the base. A spring is fitted onto the stem portion of the valve core. The tapered end of the valve core in inlet valve 111 faces the inlet port 11, while the tapered end of the valve core in outlet valve 121 faces away from the outlet port 12. Inlet valve 111 allows oil to flow into inlet port 11, and outlet valve 121 allows oil to flow out of outlet port 12. A negative pressure exists at inlet valve 111, causing it to open under atmospheric pressure. Outlet valve 121 is the outlet port 12, opened by oil pressure.

[0057] Preferably, the positioning pin 13 is located at the middle of the oil inlet 11 and the oil outlet 12. Specifically, the central angle enclosed by the two ends of the first notch is 90°. Preferably, the first notch is located at the middle of the opposite side of the second notch. When the positioning pin 13 is located at the first end 422 of the sliding cavity 42, the control cavity 41 communicates with the oil inlet 11; when the positioning pin 13 is located at the second end 423 of the sliding cavity 42, the control cavity 41 communicates with the oil outlet 12, which facilitates the initial pushing of the slider 4 by the oil during counterclockwise or clockwise rotation.

[0058] When the rotating shaft 5 rotates clockwise, the slider 4 slides to the first limit position where the positioning pin 13 is located in the sliding cavity 42, and the slider 4 abuts and is fixed with the positioning pin 13; when the rotating shaft 5 rotates counterclockwise, the slider 4 slides to the second limit position where the positioning pin 13 is located in the sliding cavity 42, and the slider 4 abuts and is fixed with the positioning pin 13.

[0059] When the rotation changes from clockwise to counterclockwise, the locating pin 13 is located at the first end of the sliding cavity 42, i.e., the first limiting position. At this time, the eccentric position of the outer rotor 3 is located between the rotating shaft 5 and the locating pin 13. The rotating shaft 5 rotates counterclockwise, and the control cavity 41 is connected to the oil inlet 11. The oil enters the control cavity 41 from the wall at the oil inlet 11, forming a gradient pressure within the control cavity 41. The oil is pushed from the high-pressure end to the low-pressure end. Under the action of the torque formed by the viscous force and the pushing force of the oil, the slider 4 rotates counterclockwise. When the slider 4 rotates, the control cavity 41 rotates accordingly, causing the outer rotor 3 to rotate with the slider 4. Since the rotation axis of the slider 4 coincides with the rotation axis of the inner rotor 2, the eccentric position of the outer rotor 3 changes with the rotation direction of the slider 4. At this time, the side opposite to the locating pin 13 is the meshing area of ​​the outer rotor 3 and the inner rotor 2. The outer rotor 3 rotates counterclockwise. The oil inlet 11 is located in the area where the meshing cavity gradually increases, and the oil outlet 12 is located in the area where the meshing cavity gradually decreases. Oil enters through the oil inlet 11 and exits through the oil outlet 12.

[0060] like Figures 5-9 As shown, during the rotation of slider 4 from 0° to 45°, 90°, 135°, and 180°, the rotation direction of shaft 5 remains unchanged. The eccentric position of outer rotor 3 changes with the rotation direction of slider 4, and the meshing position of outer rotor 3 and inner rotor 2 also changes accordingly, but the eccentricity remains unchanged. The position of oil inlet 11 is always on the side where the rotors are separated and the volume increases, while the position of oil outlet 12 is always on the side where the rotors are meshed and the volume decreases. Therefore, the functions of oil inlet 11 and oil outlet 12 remain unchanged. That is, oil enters through oil inlet 11 and exits through oil outlet 12.

[0061] After the slider 4 rotates to 180°, the slider 4 drives the sliding cavity 42 to rotate until the positioning pin 13 is in the second limit position. The slider 4 then abuts against the positioning pin 13 and is fixed in the second limit position.

[0062] When the rotation direction of the rotating shaft 5 switches from counterclockwise to clockwise, initially, the slider 4 remains stationary, the control chamber 41 is connected to the oil outlet 12, and the control chamber 41 is under negative pressure, pushing the slider 4 to rotate clockwise. The slider 4 drives the outer rotor 3 to rotate, and the rotation axis of the slider 4 coincides with the rotation axis of the inner rotor 2. The meshing position of the outer rotor 3 and the inner rotor 2 is located on one side of the positioning pin 13, and the eccentric position of the outer rotor 3 is on the opposite side of the positioning pin 13. After the instantaneous switch of the rotation direction of the rotating shaft 5, due to the clockwise rotation of the outer rotor 3, the position of the oil inlet 11 is located in the region where the meshing cavity gradually increases, and the oil outlet 12 is located in the region where the meshing cavity gradually decreases. Oil enters through the oil inlet 11, and oil exits through the oil outlet 12.

[0063] During the rotation of slider 4 from 180° to 135°, 90°, 45°, and 0°, the rotation direction of shaft 5 remains unchanged. The eccentric position of outer rotor 3 changes with the rotation direction of slider 4, and the meshing position of outer rotor 3 and inner rotor 2 also changes accordingly, but the eccentricity remains constant. The position of oil inlet 11 is always on the side where the rotors are separated and the volume increases, while the position of oil outlet 12 is always on the side where the rotors are meshed and the volume decreases. Therefore, the functions of oil inlet 11 and oil outlet 12 remain unchanged. That is, oil enters through oil inlet 11 and exits through oil outlet 12.

[0064] Therefore, whether the slider 4 is switching between clockwise and counterclockwise rotation or during counterclockwise rotation, the functions of the oil inlet 11 and the oil outlet 12 remain unchanged. That is, oil enters through the oil inlet 11 and exits through the oil outlet 12.

[0065] In the prior art, without the slider 4, the outer rotor 3 directly contacts the housing 1, the eccentric position of the outer rotor 3 is fixed, and the meshing area between the outer rotor 3 and the inner rotor 2 is fixed. As long as the rotation direction of the shaft 5 remains unchanged, the position of the oil inlet 11 is always on the side where the rotors are separated and the volume increases, and the position of the oil outlet 12 is always on the side where the rotors are meshed and the volume decreases; the functions of the oil inlet 11 and the oil outlet 12 remain unchanged. When the rotation direction of the shaft 5 changes, the meshing area between the outer rotor 3 and the inner rotor 2 is opposite to its original position, and the meshing sequence between the outer rotor 3 and the inner rotor 2 is reversed. Therefore, the functions of the oil inlet 11 and the oil outlet 12 change; the position of the oil inlet 11 becomes the oil outlet, and the position of the oil outlet 12 becomes the oil inlet.

[0066] Compared with the prior art, in this embodiment, a slider 4 is provided between the outer rotor 3 and the housing 1. The inner side of the slider 4 has a notch, which forms a control cavity 41 with the outer circle of the outer rotor 3. The wall of the outer rotor 3 is provided with an oil outlet 31. The lubricating oil enters the control cavity 41 through the oil outlet 31 and pushes the slider 4 to rotate by the oil pressure. The slider 4 drives the outer rotor 3 to rotate. During the rotation, the eccentric position of the outer rotor 3 and the meshing area between the outer rotor 3 and the inner rotor 2 are changed, so that the meshing area between the outer rotor 3 and the inner rotor 2 changes with the rotation direction of the slider 4, so that the area where the meshing cavity volume increases and decreases does not change when the rotation direction is different. The functions of the oil inlet 11 and the oil outlet 12 remain unchanged, that is, the oil inlet 11 is for oil intake and the oil outlet 12 is for oil discharge. In cases where different steering lubricating pumps are required in the prior art, this embodiment can achieve the same function of the oil inlet 11 and oil outlet 12 in both clockwise and counterclockwise situations without the need to set up two lubricating pumps with different steering and a complex transmission system. Moreover, this embodiment has a simple and compact structure, is easy to install and disassemble, has low cost, and can be widely used in lubricating oil systems.

[0067] Example 2

[0068] This utility model also provides a transmission system, including the lubricating oil pump in Embodiment 1 above.

[0069] Compared with the prior art, the advantages of the transmission system of this utility model embodiment are the same as those of the above-mentioned lubricating oil pump, and will not be repeated here.

[0070] Example 3

[0071] This utility model also provides a tiltrotor aircraft, including the transmission system in Embodiment 2 above.

[0072] Compared to the prior art, the tiltrotor aircraft of this utility model has the same advantages as the transmission system described above, and will not be repeated here.

[0073] The above description is only a preferred 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 conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lubricating oil pump, characterized in that, It includes a housing (1), an inner rotor (2), an outer rotor (3), and a slider (4); The inner rotor (2) is connected to the rotating shaft (5); the inner rotor (2) has external teeth, and the outer rotor (3) has internal teeth, the internal teeth meshing with the external teeth; The outer rotor (3) has an oil outlet hole (31) arranged circumferentially on its side wall; The slider (4) has a cylindrical structure and is disposed between the outer rotor (3) and the housing (1); the inner edge of the slider (4) has a first notch, and the first notch and the outer wall of the outer rotor (3) form a control cavity (41).

2. The lubricating oil pump according to claim 1, characterized in that, The outer edge of the slider (4) also has a second notch; the second notch forms a sliding cavity (42) with the inner wall of the housing (1).

3. The lubricating oil pump according to claim 2, characterized in that, The central angle between the two ends of the second notch is 180°; the radius from one end of the second notch to the other end is the same.

4. The lubricating oil pump according to claim 3, characterized in that, The sliding cavity (42) includes a sliding cavity body (421), a first end (422), and a second end (423); the first end (422) and the second end (423) are located at both ends of the sliding cavity body (421).

5. The lubricating oil pump according to claim 4, characterized in that, It also includes a positioning pin (13), which is disposed on the inner wall of the housing (1) and is located in the sliding cavity (42); When the positioning pin (13) is located at the first end (422), the slider is prevented from continuing to rotate in the first direction; when the positioning pin (13) is located at the second end (423), the slider (4) is prevented from continuing to rotate in the second direction; the first direction and the second direction are opposite.

6. The lubricating oil pump according to claim 1, characterized in that, The radius of the bottom surface of the first notch gradually decreases from one end to the other, so that the cross-section of the control cavity (41) changes in a gradient from one end to the other.

7. The lubricating oil pump according to claim 1, characterized in that, It also includes an oil inlet (11) and an oil outlet (12); the oil inlet (11) and the oil outlet (12) are disposed on the housing (1); The oil inlet (11) is provided with an oil inlet valve (111); the oil outlet (12) is provided with an oil outlet valve (121); both the oil inlet valve (111) and the oil outlet valve (121) are one-way valves, and the oil inlet valve (111) and the oil outlet valve (121) are in opposite directions.

8. The lubricating oil pump according to claim 1, characterized in that, The outer rotor (3) rotates eccentrically under the drive of the inner rotor (2); the inner tooth has one more tooth than the outer tooth.

9. A transmission system, characterized in that, Includes the lubricating oil pump according to any one of claims 1-8.

10. A tiltrotor aircraft, characterized in that, Includes the transmission system as described in claim 9.

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