Oil filler cap of lubricating oil tank of aero-engine

Abstract

The utility model discloses an aero-engine lubricating oil tank oil filling port cover, which is used for closing and sealing an oil filling port of a lubricating oil tank after lubricating oil is supplemented and filled during ground maintenance, and mainly comprises a locking block, a spring, a large sealing ring, a port cover, a small sealing ring, a gasket, a rotating shaft, a handle and the like. According to the utility model, the lubricating oil tank oil filling port seat and the port cover of the engine are sealed through the large sealing ring, after gravity oil filling is completed on the ground, the oil filling port cover is closed through rotation of the handle to achieve the sealing effect, and when gravity oil filling is needed, the handle is reversely rotated again to open the port cover for oil filling. And normal work of an engine lubricating system is ensured. The engine lubricating oil tank is small in size and weight, small and compact in structure, high in reliability and convenient to disassemble and assemble quickly, and the use maintainability of the engine lubricating oil tank during gravity oil injection is effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of aviation engine lubrication transmission systems, and in particular relates to a structure of an oil filling port cover of an aviation engine lubricating oil tank. Background Art

[0002] The engine lubrication transmission system will consume lubricating oil during use, and the lubricating oil tank is mainly used for lubricating oil storage, lubricating oil level monitoring and lubricating oil filling. After the engine stops, lubricating oil needs to be added on the ground to replenish a certain amount of lubricating oil. At this time, a gravity oil filling port needs to be opened on the upper part of the lubricating oil tank as a circulation channel for filling lubricating oil. Therefore, it is necessary to design a portable, simple in structure, and highly reliable oil filling port cover for closing the gravity oil filling port. On February 23, 2023, the applicant submitted a utility model application entitled Sealing Port Cover Device Fixed by Spring Self-Locking (CN219176451U), which discloses a fuel / oil filling port cover, but the cover still has the following problems in actual use:

[0003] First, the gasket forming the sealing surface and the lower cover used to press the gasket are both blocked by the upper crossbeam. The operator cannot directly see the situation of the lower cover pressing the gasket. When the lower cover is partially lifted or eccentric, it cannot be quickly detected, resulting in hidden dangers to the gasket sealing.

[0004] Second, no matter when the cover is opened or closed, the crossbeam needs to rotate relative to the shell base while pressing the gasket. At this time, not only is the damping during operation very large, but the friction on the upper and lower surfaces of the gasket causes uneven deformation and wear. Since the oil filling cover needs to be opened frequently, the sealing performance and service life of the gasket will be reduced over time.

[0005] Third, although the handle limit and spring provide axial locking pressure, the lower cover itself is only subject to circumferential constraints from the friction of the gasket. Acceleration, deceleration and vibration during the operation of the aircraft will cause it to rotate relative to the base of the shell. This process will cause the gasket to deform and affect the sealing performance.

[0006] Fourth, there is room for further optimization of the weight and volume of the lower cover and crossbeam.

[0007] Based on the above reasons, the applicant decided to improve and adjust the design. Summary of the invention

[0008] In view of the problems existing in the background technology, the utility model aims to provide an aircraft engine oil tank filling port cover, which is used to complete the sealing of the oil tank after gravity oiling on the ground, avoid oil leakage, and ensure the normal operation of the engine lubrication system. It also meets the requirements of simple structure, light weight and simple operation. Not only will the various structural parts not rotate relative to each other, but the sealing performance, pressure bearing performance and service life of the cover can also be improved, and at the same time, the fitting of the sealing surface can be quickly and intuitively observed.

[0009] In order to solve the above problems, the utility model adopts the following technical solutions:

[0010] An oil filling port cover of an aircraft engine lubricating oil tank, comprising:

[0011] A mouth cover, wherein the mouth cover is provided with a first through hole penetrating the upper and lower end surfaces thereof, a first sealing groove is provided on the inner wall of the first through hole, a second sealing groove is provided on the circumferential outer surface of the mouth cover, a limiting boss for limiting the rotation of the handle around the axis of the mouth cover is also provided on the upper end surface of the mouth cover, the limiting boss includes three limiting surfaces, and an area for the handle to rotate around the axis of the mouth cover is formed between the three limiting surfaces, and a positioning boss is provided on the lower end surface of the mouth cover, which cooperates with the oil filling port seat of the lubricating oil tank and is used to limit the rotation of the mouth cover relative to the oil filling port seat of the lubricating oil tank;

[0012] A handle, the handle is located above the upper end surface of the mouth cover, one end of the handle is provided with a notch, a shaft hole, a first contact surface and a second contact surface, wherein the shaft hole vertically passes through the notch, the first contact surface and the second contact surface are two planes on the handle surface that are parallel to the axis of the shaft hole, intersect, and do not contact the upper end surface of the mouth cover at the same time, and the vertical distance L1 from the first contact surface to the axis of the shaft hole is smaller than the vertical distance L2 from the second contact surface to the axis of the shaft hole;

[0013] The locking block includes a connecting rod, a second through hole is formed at a first end of the connecting rod, and after the connecting rod passes through the first through hole of the cover, it is rotatably connected with the handle in the notch of the handle through a rotating shaft inserted in the rotating shaft hole and the second through hole, and a supporting arm is also provided on the connecting rod, and the outer diameter of the supporting arm is between the minimum inner diameter and the maximum outer diameter of the inner cavity of the oil filling port seat of the lubricating oil tank;

[0014] A spring, wherein the spring is sleeved on the connecting rod of the locking block, and the two ends of the spring are respectively in close contact with the supporting arm of the locking block and the lower end surface of the cover;

[0015] A large sealing ring, which is installed in a second sealing groove on the circumferential outer surface of the port cover, forming a sealing surface between the port cover and the inner wall surface of the oil filling port seat of the lubricating oil tank;

[0016] A small sealing ring is installed in a first sealing groove on the inner wall of the first through hole of the cover, forming a sealing surface between the connecting rod of the locking block and the inner wall of the first through hole of the cover.

[0017] Furthermore, an angle between the first contact surface and the second contact surface is an acute angle.

[0018] Furthermore, a gasket is provided between the handle and the upper end surface of the mouth cover.

[0019] Furthermore, the gasket is a stainless steel open gasket.

[0020] Furthermore, a third through hole is formed on the rotating shaft; the first end of the connecting rod of the locking block also includes a pin hole, which intersects the second through hole vertically, and an elastic cylindrical pin is inserted in the pin hole, and the elastic cylindrical pin is inserted in the pin hole and the third through hole.

[0021] Furthermore, the first end surface of the connecting rod also includes a pair of parallel planes, and the parallel planes intersect the second through hole perpendicularly; the groove of the handle includes a pair of parallel planar wall surfaces.

[0022] Furthermore, the support arm is a ray-shaped structure extending outward from the axis of the connecting rod as the center, and there are at least two ray-shaped structures. It should be noted that there is a circle of annular protrusions on the inner wall of the oil filling port seat of the lubricating oil tank, and at least two notches are opened on the annular protrusions. The two ends of the support arm go from the upper part of the annular protrusion through the notches to the lower part of the annular protrusion, and after rotation, they are tightly attached to the non-notch part of the annular protrusion, thereby achieving installation positioning.

[0023] The main structure of the aviation engine oil tank oil filling port cover of the utility model is composed of a locking block, a spring, a rotating shaft, a cover and a handle, and has the technical characteristics of small size and weight, small and compact structure, high reliability, and convenient and quick disassembly and assembly. Compared with the currently used aviation engine oil tank oil filling port cover, the weight is reduced by about 30%, and the technical problems of the engine oil tank oil filling port cover having a complex structure, heavy weight, and inconvenient operation can be solved.

[0024] Compared with the prior art, the utility model also has the following characteristics:

[0025] (1) The vertical distances from the first contact surface and the second contact surface on the handle to the axis of the rotating shaft hole are different, which makes full use of the stroke difference caused by the handle flipping to drive the mouth cover displacement (the compression deformation force of the spring provides the force to open the mouth cover), so that the mouth cover can be opened and closed by flipping the handle. During the opening and closing process, the large sealing ring is only deformed by axial extrusion, and there is no circumferential uneven extrusion deformation caused by the friction between the upper and lower surfaces, which reduces wear and prolongs the service life;

[0026] (2) The locking block is fixed to the inner cavity of the oil filling port seat of the lubricating oil tank by using the support arm structure, and the port cover for installing the large sealing ring and the small sealing ring is located above the support arm, so that the installation status of the port cover can be directly observed. When the port cover is tilted or eccentric, its position can be adjusted in time to avoid the situation of poor sealing. At the same time, the support arm structure is smaller in size and lighter in weight than the crossbeam in the existing port cover;

[0027] (3) The angle between the first contact surface and the second contact surface on the handle is designed to be acute, thereby increasing the angular travel of the handle from the open state to the closed state and changing the torque of the handle to avoid accidental opening caused by vibration or mis-triggering of the handle;

[0028] (4) The design of the small sealing ring improves the pressure bearing capacity of the mouth cover (the working pressure can reach 15MPa) and the sealing performance; (5) Only when the mouth cover and the support arm are correctly installed in place, the handle is finally turned over to compress the large sealing ring, so there is almost no damping in the sealing process (that is, the large sealing ring will not rotate in the compressed state). Similarly, when removing the mouth cover and the support arm, first turn the handle to loosen the large sealing ring, and then rotate to remove the mouth cover and the support arm. At this time, there is still no obvious rotation damping;

[0029] (6) The design of the positioning boss prevents the cover from rotating, thereby eliminating the possibility that the cover may drive the large sealing ring to rotate due to aircraft acceleration, deceleration or vibration, thereby avoiding reduction or failure of the sealing performance. The design of the limit boss, on the one hand, prevents the free rotation of the handle from driving the support arm to separate from the oil tank filling port seat, and on the other hand, clarifies the rotation angle for driving the support arm to rotate and separate from the inner cavity of the oil tank filling port seat through the operation of the handle (the two limit surfaces serve as the positions for the support arm to enter or separate from the notch on the annular protrusion of the oil tank filling port seat, respectively), and also ensures that the operator will not pinch his hand between the handle and the cover when using the handle (the limit boss plays a role of shielding and isolation). BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of installing the oil filling port cover of the utility model on the oil filling port seat of the lubricating oil tank;

[0031] Figure 2 This is the oil filling cap assembly diagram (closed state);

[0032] Figure 3 This is the oil filling cap assembly diagram (open state);

[0033] Figure 4 This is the exploded view of the oil filling cap;

[0034] Figure 5 It is the axonometric view of the locking block;

[0035] Figure 6 This is a diagram of the mouth cover structure;

[0036] Figure 7 for Figure 6 The main view;

[0037] Figure 8 for Figure 6 A cross-sectional view of

[0038] Fig. 9 This is the handle structure diagram;

[0039] Fig.10 for Fig. 9 The main view;

[0040] In the figure: 1-locking block; 2-spring; 3-large sealing ring; 4-mouth cover; 5-small sealing ring; 6-gasket; 7-rotating shaft; 8-handle; 9-elastic cylindrical pin; 10-limiting boss; 11-positioning boss; 12-inner groove; 13-outer groove. DETAILED DESCRIPTION

[0041] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to the common technical knowledge and customary means in the field are included in the scope of the present invention.

[0042] like Figures 1 to 10 As shown, the oil filling port cover of the aircraft engine lubricating oil tank designed in this embodiment includes a locking block 1, a spring 2, a large sealing ring 3, a cover 4, a small sealing ring 5, a gasket 6, a rotating shaft 7, a handle 8 and an elastic cylindrical pin 9. The locking block 1, the spring 2, the rotating shaft 7, the cover 4, and the handle 8 constitute the main structure of the oil filling port cover. The locking block 1 is used for limiting the position. By pulling the handle 8, the cover 4 is moved to move and the large sealing ring 3 on the cover 4 is compressed to achieve the sealing of the lubricating oil tank. The locking block 1 and the handle 8 are connected by a rotating shaft 7. A spring 2 is installed between the locking block 1 and the cover 4. The cover 4 is designed with an outer groove 13 as a second sealing groove and an inner groove 12 as a first sealing groove, wherein the outer groove 13 is equipped with a large sealing ring 3, and the inner groove 12 is equipped with a small sealing ring 5. A limiting boss 10 is designed on the outer side of the cover 4, and a positioning boss 11 is designed on the inner side. The locking block 1 has two arms, and the two contact surfaces when the handle 8 contacts the gasket 6 are not at equal distances from the axial center of the rotating shaft 7. Positioning holes are opened on the locking block 1 and the rotating shaft 7. After the elastic cylindrical pin 9 is assembled into the positioning hole, the locking block 1 and the rotating shaft 7 are connected. A gasket 6 is installed between the cover 4 and the handle 8, and the gasket 6 is made of stainless steel.

[0043] like Figure 2 As shown, this schematic diagram shows the state when the oil filling port cover is closed, the cover 4 and the spring 2 are assembled between the lock block 1 and the handle 8, and the elastic force of the spring 2 keeps the cover 4 always lifted up to ensure that the cover 4 does not shake freely.

[0044] like Figure 3 As shown, this schematic diagram shows the state when the oil filling port cover is opened. The handle 8 and the lock block 1 are fixedly connected through the rotating shaft 7. The handle 8 can be freely turned around the axis of the rotating shaft 7. When the handle 8 is turned upward, as shown in FIG. Figure 7 As shown, since L1 < L2, the cover 4 is pushed upward by the spring 2 to open the oil filling cover (open the sealing surface).

[0045] like Figure 4 As shown, the locking block 1, the rotating shaft 7, and the handle 8 can also rotate freely around the axis of the locking block 1 as a whole. By rotating the handle 8, the locking block 1 can be linked to rotate to a certain angle (there is a circle of annular protrusions on the inner cavity of the oil filling port seat of the lubricating oil tank, and a notch is opened on the annular protrusion. When the locking block 1 is rotated to a certain angle, the support arm just breaks away from the notch. When installing the locking block 1, the support arm enters from the notch, and then rotates to a certain angle and is restricted on the annular protrusion in the inner cavity of the oil filling port seat of the lubricating oil tank), it can be taken out from the gravity oil filling port seat of the lubricating oil tank and then oil is filled.

[0046] like Figure 4 As shown, a gasket 6 is used to block the handle 8 and the cover 4. The gasket 6 is made of stainless steel and has good wear resistance, which prevents the first contact surface and the second contact surface of the handle 8 from wearing the contact surface of the cover 4, thereby ensuring the durability of the oil filling cover.

[0047] like Figure 5 As shown, the lower part of the lock block 1 is designed with two symmetrical arms to provide a support force when the oil filling port cover is closed (cooperating with Figure 1 It can be seen that the two support arms are respectively stuck under the annular protrusion of the inner cavity of the oil filling port seat of the lubricating oil tank, thereby limiting its axial displacement and generating a support reaction force) to ensure that the cover 4 can be closed; the upper part is designed with a rotating shaft 7, an elastic cylindrical pin 9 mounting hole and two parallel planes, and the two parallel planes are perpendicular to the rotating shaft 7 to facilitate the assembly and positioning of the locking block 1 and the groove on the handle 8.

[0048] like Figure 6 and Figure 7As shown, the upper and lower sides of the cover 4 are respectively designed with a limiting boss 10 and a positioning boss 11. Among them, the positioning boss 11 can ensure that after the cover is assembled to the oil filling port seat of the lubricating oil tank, it is embedded with the positioning groove on the oil filling port seat, so that the cover 4 does not rotate; the limiting boss 10 can limit the handle 8 when it rotates around the axis of the cover 4 to ensure that the handle 8 does not rotate freely. The limiting boss 10 is an open structure that is not closed, and a first limiting surface B and a second limiting surface D are formed at the opening, and a third limiting surface C is formed between the first limiting surface B and the second limiting surface D. When the cover 4 is in the open state, the handle 8 can rotate between the first limiting surface B and the second limiting surface D. When the cover 4 is in the closed state, the handle 8 can rotate between the first limiting surface B and the third limiting surface C. The upper end surface of the cover 4 is engraved with arrow directions and instruction texts, indicating the direction in which the cover 4 rotates to open or close. Figure 7 In the figure, arrows B, C and D respectively indicate the first, second and third limiting surfaces on the limiting boss 10, wherein the first limiting surface B and the second limiting surface D are used to limit the handle 8 in the open state of the cover 4 (corresponding to Figure 3 ) when the handle 8 contacts the second limit surface D, indicating that the arm has aligned with the notch position on the annular protrusion of the inner cavity of the oil filling port seat of the lubricating oil tank, and the cover 4 can be taken out synchronously by pulling up the handle 8. When the handle 8 contacts the first limit surface B, it indicates that the arm has avoided the notch position and will not be separated from the annular protrusion. The first limit surface B and the third limit surface C are used to limit the handle 8 in the closed state of the cover 4 (corresponding to Figure 2 ), wherein the position of the third limiting surface C is determined according to the following principles during design: when the handle 8 is in Figure 2 When the cover 4 is in the closed state, the handle 8 will only touch the first limit surface B and the third limit surface C during rotation, and will not touch the second limit surface D. For example, the outer dimensions L1 and L3 (the distance from the axis of the shaft hole of the handle 8 to the side edge) of the handle 8 are adjusted so that the dimension L1 of the handle 8 is Figure 2 When the state rotates, only the first limit surface B and the third limit surface C will be touched (see Figure 7 , the side of the handle 8 corresponding to the dimension L1 first touches the third limiting surface C during the counterclockwise rotation and cannot continue to rotate, thus being restricted), while the dimension L3 of the handle 8 is Figure 3 When the state rotates, it will only touch the first limit surface B and the second limit surface D (see Figure 7 , the side of the handle 8 corresponding to the size L3 can avoid the third limiting surface C during the counterclockwise rotation and continue to rotate until it touches the second limiting surface D and then stops).

[0049] like Figure 8As shown, the inner and outer sides of the cover 4 are respectively designed with an inner groove 12 and an outer groove 13, wherein the inner groove 12 is equipped with a small sealing ring 5, and the outer groove 13 is equipped with a large sealing ring 3. Since the cover can slide in the axial direction of the locking block 1, the small sealing ring 5 can seal the matching parts of the two; the large sealing ring 3 is mainly used for sealing between the oil filling cover and the oil filling seat of the lubricating oil tank.

[0050] like Fig. 9 and Fig.10 As shown, the distances from the axis center of the handle 8 shaft hole to the two side margins are L1 and L2 respectively, and L1 should be less than L2 to ensure that the cover 4 can be opened and closed; the angle A between the first contact surface and the second contact surface should be an acute angle (i.e., to reduce the turning moment of the cover 4 on the handle 8), so that the cover 4 is always in a compressed state under the pressure of the inner cavity of the lubricating oil tank, avoiding the handle 8 from being lifted and losing its sealing.

[0051] The handle 8 and its supporting structure in the oil filling port cover of the lubricating oil tank are one of the main innovations of the utility model. Figure 4 As shown, the utility model is to design the layout of the handle 8 shaft hole in a reasonable size, thereby generating a displacement stroke difference of the cover 4, thereby realizing the opening and closing of the cover 4 seal. In this process, the large sealing ring 3 will not produce circumferential extrusion deformation and wear caused by rotation, only axial extrusion and reset. Another innovative point of the utility model is the limiting boss 10 and the positioning boss 11, which ensure that the oil filling port cover is limited as a whole, and will not rotate without limit to cause sealing failure.

[0052] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An oil filling port cover for an aircraft engine oil tank, It is characterized in that include: A mouth cover (4), wherein the mouth cover (4) is provided with a first through hole penetrating the upper and lower end surfaces thereof, a first sealing groove is provided on the inner wall of the first through hole, a second sealing groove is provided on the circumferential outer surface of the mouth cover (4), a limiting boss (10) is also provided on the upper end surface of the mouth cover (4) for limiting the rotation of the handle (8) around the axis of the mouth cover (4), the limiting boss (10) includes three limiting surfaces, and a region for the handle (8) to rotate around the axis of the mouth cover (4) is formed between the three limiting surfaces, and a positioning boss (11) is provided on the lower end surface of the mouth cover (4) for cooperating with the oil filling port seat of the lubricating oil tank and for limiting the rotation of the mouth cover (4) relative to the oil filling port seat of the lubricating oil tank; A handle (8), the handle (8) being located above the upper end surface of the mouth cover (4), one end of the handle (8) being provided with a notch, a rotation axis hole, a first contact surface and a second contact surface, wherein the rotation axis hole vertically passes through the notch, the first contact surface and the second contact surface are two planes on the surface of the handle (8) which are parallel to the axis of the rotation axis hole, intersecting and not in contact with the upper end surface of the mouth cover (4) at the same time, and the vertical distance L1 from the first contact surface to the axis of the rotation axis hole is smaller than the vertical distance L2 from the second contact surface to the axis of the rotation axis hole; A locking block (1), the locking block (1) comprising a connecting rod, a second through hole being formed at a first end of the connecting rod, and the connecting rod passing through the first through hole of the cover (4) and being rotatably connected with the handle (8) in a notch of the handle (8) via a rotating shaft (7) inserted into the rotating shaft hole and the second through hole, and a support arm being further provided on the connecting rod, the outer diameter of the support arm being between the minimum inner diameter and the maximum outer diameter of the inner cavity of the oil filling port seat of the lubricating oil tank; A spring (2), wherein the spring (2) is sleeved on the connecting rod of the locking block (1), and the two ends of the spring (2) are respectively in close contact with the support arm of the locking block (1) and the lower end surface of the cover (4); A large sealing ring (3), the large sealing ring (3) being installed in a second sealing groove on the circumferential outer surface of the opening cover (4), forming a sealing surface between the opening cover (4) and the inner wall surface of the oil filling port seat of the lubricating oil tank; A small sealing ring (5) is installed in a first sealing groove on the inner wall of the first through hole of the cover (4), forming a sealing surface between the connecting rod of the locking block (1) and the inner wall of the first through hole of the cover (4).

2. The oil filling port cover of an aircraft engine lubricating oil tank according to claim 1, Features: The included angle between the first contact surface and the second contact surface is an acute angle.

3. The oil filling port cover of an aircraft engine lubricating oil tank according to claim 1, Features: A gasket (6) is also provided between the handle (8) and the upper end surface of the mouth cover (4).

4. The oil filling port cover of an aircraft engine lubricating oil tank according to claim 3, Features: The gasket (6) is a stainless steel open gasket.

5. The oil filling port cover of an aircraft engine lubricating oil tank according to claim 1, Features: The rotating shaft (7) is provided with a third through hole; The first end of the connecting rod of the locking block (1) further comprises a pin hole, the pin hole intersects the second through hole vertically, an elastic cylindrical pin (9) is inserted into the pin hole, and the elastic cylindrical pin (9) is inserted into the pin hole and the third through hole.

6. The oil filling port cover of an aircraft engine lubricating oil tank according to claim 1, Features: The first end surface of the connecting rod further includes a pair of parallel planes, and the parallel planes intersect the second through hole perpendicularly; The groove of the handle (8) comprises a pair of parallel plane walls.

7. The oil filling port cover of an aircraft engine lubricating oil tank according to claim 1, Features: The support arm is a ray-shaped structure extending outward from the axis of the connecting rod as the center, and there are at least two ray-shaped structures.

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