Lubricating oil pump, transmission system and tilt rotor aircraft

Abstract

The invention 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 that the transmission system is complicated in design and relatively high in cost 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, and the inner teeth are meshed with the outer teeth; oil outlet holes are formed in the side wall of the outer rotor 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 while the oil inlet and the oil outlet are not changed can be achieved, and the lubricating oil pump is compact in structure and convenient to mount and dismount.

Description

Technical Field

[0001] The present invention relates to the field of aerospace technology, and in particular to a lubricating oil pump, a transmission system and a tiltrotor aircraft. Background Art

[0002] Oil pumps play a key role in ensuring the proper functioning of equipment, extending service life, and improving system efficiency by providing a stable flow of lubricating oil. Oil pumps provide forced lubrication for bearings, gearboxes, and other components of aircraft engines (such as turbojets and turbofans), ensuring proper operation in harsh environments such as high altitudes and high speeds.

[0003] Under normal circumstances, the lubricating oil pump operates in the specified rotation direction. At this time, the movement direction of the rotor matches the delivery direction of the lubricating oil, and normal oil inlet and outlet can be achieved. The lubricating oil pump rotates in the opposite direction, causing the lubricating oil to flow in the opposite direction, and the oil inlet and outlet functions are interchanged.

[0004] Existing tiltrotor aircraft require two symmetrical transmission systems, each containing an oil pump. The oil pumps in these two transmission systems rotate clockwise and counterclockwise, respectively. This requires a complex redesign of the transmission system's oil circuits and a high cost of designing two different oil pumps. Summary of the Invention

[0005] In view of the above analysis, the embodiments of the present invention aim to provide a lubricating oil pump, a transmission system and a tilt-rotor aircraft to solve the problem of complex transmission system design and high cost when the current aircraft requires both clockwise and counterclockwise lubricating oil pumps.

[0006] The purpose of the present invention is mainly achieved through the following technical solutions:

[0007] A first aspect of the present invention provides a lubricating oil pump comprising 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, and the internal teeth are meshed with the external teeth;

[0009] The outer rotor side wall has oil outlet holes arranged along the circumferential direction;

[0010] The slider is a cylindrical structure and is arranged 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 sliding block also has a second notch; the second notch and the inner wall of the shell form a sliding cavity.

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

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

[0014] Furthermore, it also includes a positioning pin, which is arranged on the inner wall of the shell and is located in 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 are opposite.

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

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

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

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

[0020] A second aspect of the present invention provides a transmission system comprising the lubricating oil pump.

[0021] A third aspect of the present invention provides a tiltrotor aircraft comprising the 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 prior art, in which the connection mode needs to be changed when the lubricating oil pump needs to rotate clockwise and counterclockwise, which makes the transmission system design complicated and costly, the present invention sets a slider between the outer rotor and the housing. The inner side of the slider has a notch, forming a control cavity with the outer circle of the outer rotor. The wall of the outer rotor is provided with an oil outlet hole, and the lubricating oil enters the control cavity through the oil outlet hole. The slider is pushed to rotate by the oil pressure, and the slider drives the outer rotor to rotate, changing the eccentric position of the outer rotor and the meshing area of ​​the outer rotor and the inner rotor during rotation, so that the meshing area of ​​the outer rotor and the inner rotor changes with the rotation direction of the slider. The meshing order remains unchanged in different rotation directions, the area where the meshing cavity volume increases and decreases remains unchanged, and the functions of the oil inlet and the oil outlet remain unchanged, that is, the oil inlet always takes in oil, and the oil outlet always discharges oil. For situations where different steering oil pumps are required, there is no need to set up two lubricating oil pumps with different steering directions and a complicated transmission system, as the functions of the oil inlet and oil outlet remain unchanged when the lubricating oil pump rotates clockwise or counterclockwise. The present invention has a simple and compact structure, is easy to install and disassemble, and has low cost, and can be widely used in lubricating oil 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 until the positioning pin is located at the first end or the second end.

[0025] (3) The inner rotor meshes with the outer rotor. The inner rotor rotates with the shaft, driving the outer rotor to rotate. Driven by the inner rotor, the outer rotor rotates eccentrically, forming an uneven meshing gap and multiple independent, changing sealed chambers. The outer rotor has one more tooth than the inner rotor, so the outer rotor rotates slower than the inner rotor. The outer rotor and the inner rotor always remain meshed during rotation to prevent lubricating oil from flowing back. The inner rotor and the outer rotor rotate in the same direction but asynchronously to ensure that the volume of the chamber between the teeth changes continuously, achieving continuous oil inlet and outlet, and preventing direct communication between the oil inlet area and the oil outlet area.

[0026] In the present invention, the above-mentioned technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of the present invention will be described in the following content, and some advantages will become apparent from the description or be learned through practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained as particularly pointed out in the text and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like parts throughout the drawings.

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

[0029] Figure 2 Schematic diagram of the structure of the lubricating oil pump of Example 1;

[0030] Figure 3 Schematic diagram of the cross-sectional structure of the lubricating oil pump of Example 1;

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

[0032] Figure 5 This is a schematic diagram of the initial structure of the slider in Example 1 switching from clockwise to counterclockwise;

[0033] Figure 6 This is a structural diagram of the slider of Example 1 rotated 45°;

[0034] Figure 7 This is a structural diagram of the slider of Example 1 rotated 90°;

[0035] Figure 8 This is a structural diagram of the slider of Example 1 rotated 135°;

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

[0037] Reference numerals:

[0038] 1-housing, 11-oil inlet, 111-oil inlet valve, 12-oil outlet, 121-oil outlet valve, 13-locating 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-rotating shaft, 6-end cover. DETAILED DESCRIPTION

[0039] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein the accompanying drawings 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 used to limit the scope of the present invention.

[0040] A specific embodiment of the present invention, as Figure 1-Figure 3 As shown, a lubricating oil pump is disclosed, comprising 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, and the outer rotor 3 has internal teeth, and the internal teeth 2 mesh with the external teeth 3;

[0042] The side wall of the outer rotor 3 has an oil outlet hole 31 arranged along the circumferential direction;

[0043] The slider 4 is 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 chamber 41 .

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

[0045] The inner rotor 2 is sleeved on the rotating shaft 5 and can rotate with it. The inner rotor 2 has external teeth, and the outer rotor 3 has internal teeth, which mesh with the external teeth. The outer rotor 3 has one more tooth than the inner rotor 2, and the inner rotor 2 rotates at a higher speed than the outer rotor 3. The outer rotor 3 and inner rotor 2 remain meshed during rotation, preventing lubricating oil backflow. In this embodiment, the outer rotor 3 has seven teeth, and the inner rotor 2 has six 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, and the outer rotor 3, driven by the inner rotor 2, rotates eccentrically, creating uneven meshing gaps. These meshing gaps form multiple, independently variable sealed chambers. The inner and outer rotors 2 and 3 rotate in the same direction, but asynchronously, to ensure continuous volume changes between the tooth chambers, enabling continuous oil inflow and outflow, and preventing direct communication between the oil inlet and outlet areas.

[0047] Slider 4 is a cylindrical structure, positioned between outer rotor 3 and housing 1. The outermost sidewall of slider 4 fits snugly against housing 1, further preventing oil leakage. The innermost sidewall of slider 4 fits snugly against outer rotor 3, allowing rotation of slider 4 to drive rotation of outer rotor 3.

[0048] The inner edge of slider 4 has a first notch. Together with the outer wall of outer rotor 3, this notch forms a control chamber 41 for containing lubricating oil. As slider 4 rotates, the first notch and the slider rotate coaxially, driving control chamber 41 and the lubricating oil therein to rotate coaxially with the slider.

[0049] Preferably, the first notch is an arc-shaped notch, and the radius of the notch bottom surface of the first notch gradually decreases from one end to the other end, so the cross-section of the control cavity 41 formed changes gradually from one end to the other end. The oil pressure inside the control cavity 41 produces a pressure difference, and the oil pressure difference produces a driving force on the slider 4. The direction of the driving force is consistent with the direction of rotation, forming a rotational torque, and together with the viscosity of the oil between the inner surface of the slider 4 and the outer cylindrical surface of the outer rotor 3, it drives the slider 4 to rotate.

[0050] Furthermore, if Figure 4 As shown, a plurality of oil outlet holes 31 are provided on the side wall of the outer rotor 3 along the circumferential direction, for allowing oil to enter the control chamber 41 to drive the slider 4 to rotate.

[0051] The outer edge of the slider 4 also features a second notch. The central angles of the two ends of the second notch are 180°, and the radius of the second notch from one end to the other is the same. A sliding cavity 42 is formed between the second notch and the inner wall of the housing 1. The outermost surface of the slider 4 is in contact with the inner wall 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 of the second notch from one end to the other end is the same, so the width of the sliding cavity 42 is the same. Furthermore, the central angle corresponding to the two ends of the second notch is 180°, so the rotation direction of the slider 4 changes after rotating 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 provided on the inner wall of the housing 1 and is 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 where the positioning pin 13 is located, 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 where the positioning pin 13 is located, the slider 4 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 is opposite to the second direction.

[0055] Furthermore, the housing 1 includes an oil inlet 11 and an oil outlet 12. These are located on the housing 1, corresponding to the oil inlet and oil outlet areas, respectively. To prevent the oil inlet 11 and oil outlet 12 from being replaced during the rotation of the slider 4, the oil inlet 11 is provided with an oil inlet valve 111, and 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, operating in opposite directions.

[0056] The oil inlet valve 111 and the oil outlet valve 121 each include a base, a valve core, a spring, and a valve body. The valve core is arranged in the valve body. The valve core has a tapered end at the top and a rod, and the tapered end abuts the base. The rod of the valve core is sleeved with a spring. The tapered end of the valve core of the oil inlet valve 111 faces the oil inlet 11, and the tapered end of the valve core of the oil outlet valve 121 faces away from the oil outlet 12. The oil inlet valve 111 allows only oil to enter the oil inlet 11, and the oil outlet valve 121 allows only oil to exit the oil outlet 12. There is negative pressure at the oil inlet valve 111, and it opens under the action of atmospheric pressure. The oil outlet valve 121 is the oil outlet 12, and is pushed open by oil pressure.

[0057] Preferably, the locating pin 13 is located midway between 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 midway on the opposite side of the second notch. When the locating 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 locating pin 13 is located at the second end 423 of the sliding cavity 42, the control cavity 41 communicates with the oil outlet 12, facilitating oil propulsion of the slider 4 during the initial 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 is fixed against 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 is fixed against the positioning pin 13.

[0059] When the rotation changes from clockwise to counterclockwise, the positioning pin 13 is located at the first end of the sliding cavity 42, i.e., the first limit position. At this time, the eccentric position of the outer rotor 3 is located between the rotating shaft 5 and the positioning 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 surface at the oil inlet 11, and a gradient pressure is formed in 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 viscosity of the oil and the driving force of the oil, the slider 4 rotates counterclockwise. When the slider 4 rotates, the control cavity 41 rotates, driving 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 positioning 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. The oil inlet 11 takes in oil, and the oil outlet 12 discharges oil.

[0060] like Figure 5-Figure 9 As shown, as the slider 4 rotates from 0° to 45°, 90°, 135°, and 180°, the rotation direction of the rotating shaft 5 remains unchanged. The eccentric position of the outer rotor 3 changes with the rotation direction of the slider 4, and the meshing position of the outer rotor 3 and the inner rotor 2 also changes accordingly, but the eccentricity remains unchanged. The oil inlet 11 is always located on the side where the rotors separate and the volume increases, while the oil outlet 12 is always located on the side where the rotors engage and the volume decreases. Therefore, the functions of the oil inlet 11 and oil outlet 12 remain unchanged. That is, the oil inlet 11 takes in oil, and the oil outlet 12 discharges oil.

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

[0062] When the rotation direction of shaft 5 switches from counterclockwise to clockwise, initially, slider 4 remains stationary, control chamber 41 communicates with oil outlet 12, and negative pressure exists within control chamber 41, driving slider 4 clockwise. Slider 4 rotates outer rotor 3, and the axis of rotation of slider 4 coincides with the axis of rotation of inner rotor 2. The meshing position of outer rotor 3 and inner rotor 2 is located on one side of locating pin 13, with the eccentric position of outer rotor 3 opposite to locating pin 13. After the instantaneous switch in the rotation direction of shaft 5, due to the clockwise rotation of outer rotor 3, oil inlet 11 is located in the area where the meshing chamber is gradually increasing, while oil outlet 12 is located in the area where the meshing chamber is gradually decreasing. Oil is introduced into oil inlet 11 and discharged from oil outlet 12.

[0063] As the slider 4 rotates from 180° to 135°, 90°, 45°, and 0°, the rotation direction of the shaft 5 remains unchanged. The eccentric position of the outer rotor 3 changes with the slider 4's rotation direction, and the meshing position between the outer rotor 3 and the inner rotor 2 also changes accordingly, but the eccentricity remains unchanged. The oil inlet 11 is always located on the side where the rotors separate and the volume increases, while the oil outlet 12 is always located on the side where the rotors engage and the volume decreases. Therefore, the functions of the oil inlet 11 and oil outlet 12 remain unchanged. That is, the oil inlet 11 takes in oil, and the oil outlet 12 discharges oil.

[0064] Therefore, no matter whether the slider 4 switches between counterclockwise and clockwise or rotates counterclockwise, the functions of the oil inlet 11 and the oil outlet 12 remain unchanged, that is, the oil inlet 11 takes in oil, and the oil outlet 12 discharges oil.

[0065] In the prior art, there is no slider 4, and the outer rotor 3 is in direct contact with 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 rotating shaft 5 remains unchanged, the oil inlet 11 is always located on the side where the rotors separate and the volume increases, and the oil outlet 12 is always located on the side where the rotors engage and the volume decreases. The functions of the oil inlet 11 and the oil outlet 12 remain unchanged. If the rotation direction of the rotating shaft 5 changes, the meshing area between the outer rotor 3 and the inner rotor 2 becomes opposite to the position before the change, and the meshing order 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, with the oil inlet 11 becoming the oil outlet and the oil outlet 12 becoming 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, forming a control chamber 41 with the outer circle of the outer rotor 3. The wall of the outer rotor 3 is provided with an oil outlet hole 31. The lubricating oil enters the control chamber 41 through the oil outlet hole 31, and the slider 4 is pushed to rotate by the oil pressure. The slider 4 drives the outer rotor 3 to rotate, and changes the eccentric position of the outer rotor 3 and the meshing area of ​​the outer rotor 3 and the inner rotor 2 during rotation, so that the meshing area of ​​the outer rotor 3 and the inner rotor 2 changes with the rotation direction of the slider 4, so that the areas where the volume of the meshing chamber increases and decreases in different rotation directions remain unchanged, and the functions of the oil inlet 11 and the oil outlet 12 remain unchanged, that is, the oil inlet 11 takes in oil and the oil outlet 12 discharges oil. For situations in the prior art where different steering lubricating oil pumps are required, there is no need to set up two lubricating oil pumps with different steering directions and a complicated transmission system, so that the functions of the oil inlet 11 and the oil outlet 12 remain unchanged when the lubricating oil pump rotates clockwise or counterclockwise. In addition, this embodiment has a simple and compact structure, is easy to install and disassemble, and has low cost, and can be widely used in lubricating oil systems.

[0067] Example 2

[0068] The present invention also provides a transmission system, comprising the lubricating oil pump in the above-mentioned embodiment 1.

[0069] Compared with the prior art, the advantages of the transmission system of the embodiment of the present invention are the same as those of the above-mentioned lubricating oil pump, which will not be described in detail here.

[0070] Example 3

[0071] The present invention also provides a tiltrotor aircraft, comprising the transmission system in the above-mentioned embodiment 2.

[0072] Compared with the prior art, the advantages of the tilt-rotor aircraft in the embodiment of the present invention are the same as those of the above-mentioned transmission system, which will not be described in detail here.

[0073] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A lubricating oil pump, characterized in that: It comprises 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, and the internal teeth are meshed with the external teeth; The side wall of the outer rotor (3) has an oil outlet hole (31) arranged along the circumferential direction; The slider (4) is a cylindrical structure, and is arranged 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 chamber (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 and the inner wall of the housing (1) form a sliding cavity (42).

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

4. The lubricating oil pump according to claim 3, characterized in that: The sliding cavity (42) comprises 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 two 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), the positioning pin (13) is arranged on the inner wall of the housing (1), and the positioning pin (13) 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, and 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 end, so that the cross section of the control cavity (41) changes gradually from one end to the other end.

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 arranged 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); the oil inlet valve (111) and the oil outlet valve (121) are both one-way valves, and the directions of the oil inlet valve (111) and the oil outlet valve (121) are opposite.

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 teeth have one more tooth than the outer teeth.

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

10. A tiltrotor aircraft, characterized in that: Includes the transmission system according to claim 9.

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