Assembly device for graphite bearing in aircraft fuel pump

Abstract

The utility model provides an assembling device for a graphite bearing in an aircraft fuel pump, which belongs to the technical field of aviation repair and comprises a first component, a second component and a clamp. The first assembly comprises a first pressing rod attached to the surface of the graphite bearing, a positioning replacement sleeve for positioning and guiding the first pressing rod and the lining and a support matched with the first pressing rod to guarantee the coaxiality. The first assembly is used for installing the first graphite bearing so that the included angle between a groove of the first graphite bearing and a connecting line of a groove of the lining can be 30 degrees. The second assembly comprises a second pressing rod and a positioning support, a second graphite bearing is installed on the second pressing rod and the positioning support in a matched mode, and the groove angle of the two graphite bearings is kept at 90 + / -10 degrees. And after the two graphite bearings are mounted, clamping is realized through a clamp. The graphite bearing assembling tool effectively guarantees the installation requirement of a graphite bearing, thereby guaranteeing the assembling quality, greatly improving the working efficiency, saving time and labor, being efficient, reducing the economic loss and avoiding the quality risk.

Description

Technical Field

[0001] The utility model belongs to the technical field of aviation repair and relates to an assembly device for a graphite bearing inside an aircraft fuel pump. Background Art

[0002] The fuel pump, a critical actuator in the fuel system, is installed on the engine transmission case and driven by the engine. It pressurizes the fuel flowing into the collector and delivers it to the hydraulic turbine pump and jet pump, providing starting fuel. During repairs, graphite bearings often suffer from severe wear and chipping, necessitating disassembly and assembly for replacement. Because graphite bearing installation requires specific requirements, existing assembly methods are unable to meet these requirements, impacting assembly quality. Therefore, a dedicated assembly device is needed to complete the assembly and restore the inherent reliability of the product.

[0003] Whether the assembly device and assembly method of graphite bearings are reasonable directly affects the service life and reliability of the product. If not, it may cause faults such as bore scraping and shaft seizure during operation. Figure 4 ):The main body of the shell assembly is a disc with a bushing installed in the center of the disc. Coaxial long columnar structures and short columnar structures are respectively made on both sides of the disc. The center lines of the grooves on the two graphite bearings installed in the bushing are connected at an angle of 30° relative to the center line of the two grooves at the circumference of the bushing. The angle of the groove F of the first graphite bearing relative to the groove E of the second graphite bearing is maintained at (90±10)°.

[0004] Currently, when assembling graphite bearings inside fuel pumps, the installation angle must be measured with a protractor, and the installation line drawn with a marker. The bearing's groove is then visually aligned with the drawn line, and the bearing is then installed using a press. This assembly method fails to accurately ensure the required installation orientation of the graphite bearing, and during installation, the bearing cannot be pressed vertically downward, which can easily damage the bearing's outer wall and, in severe cases, even cause it to break, resulting in significant financial losses. Damage to the outer wall of the graphite bearing can affect fuel pump performance, posing quality risks and potentially compromising flight safety. Utility Model Content

[0005] The utility model provides a fast and efficient assembly device for graphite bearings inside aircraft fuel pumps. During the assembly process, the graphite bearings are effectively installed according to the requirements, thereby ensuring assembly quality. The utility model significantly improves work efficiency, saves time and effort, and is highly efficient, thereby reducing economic losses and avoiding quality risks.

[0006] The specific technical solutions of the utility model are as follows:

[0007] An assembly device for a graphite bearing inside an aircraft fuel pump comprises a first component, a second component and a clamp.

[0008] The component 1 includes a pressure rod 1, a positioning ring sleeve 2 and a support 3; the pressure rod 1 is a cylinder, and its outer diameter is the same as the outer diameter of the graphite bearing. Four prisms are evenly distributed on the side wall of the cylinder along the circumference. An annular protrusion is made in the center of the bottom surface of the cylinder. The outer circle of the annular protrusion is tightly matched with the inner hole of the graphite bearing. The bottom surface of the cylinder is provided with a strip protrusion according to the surface profile of the graphite bearing, so that the graphite bearing can fit with the bottom surface of the pressure rod 1 to achieve positioning. At the same time, the pressure rod 1 is used to press the graphite bearing into the bushing. 9 inside; the positioning ring sleeve 2 is annular, and its inner diameter matches the outer diameter of the graphite bearing and the pressure rod 1 to achieve sliding fit, and the inner wall of the positioning ring sleeve 2 is evenly distributed with 4 guide grooves along the circumference, which slide with the prism on the side wall of the pressure rod 1 to achieve positioning fit between the two, and the outer diameter of the positioning ring sleeve 2 is consistent with the outer diameter of the inner sleeve 9 of the housing combination 8, and the bottom surface circumference is relatively formed with two protrusions for cooperating with the two grooves at the circumference of the bushing 9 to achieve positioning, and the pressure rod 1 and the positioning ring sleeve 2 positioning group After closing, the line connecting the strip-shaped protrusion on the bottom of the pressure rod 1 and the line connecting the two protrusions on the bottom of the positioning ring sleeve 2 are 30 degrees, so that the angle between the line connecting the center line of the groove on the graphite bearing and the line connecting the centers of the two grooves at the circumference of the bushing 9 is maintained at 30 degrees; the support 3 is a three-step columnar structure, and the outer diameter increases from top to bottom. The outer diameter of the middle section of the support 3 is matched with the inner diameter of the long columnar structure on one side of the shell combination 8. The shell combination 8 is sleeved on the middle section of the support 3 and placed on the lower end of the support 3. The upper section of the support 3 is a guide The column, whose outer diameter cooperates with the inner hole of the annular protrusion in the center of the bottom surface of the pressure rod 1, is used to guide the graphite bearing to be coaxial with the bushing 9; when in use, the long columnar structure of the shell assembly 8 is downwardly sleeved on the support 3, and the upper guide column passes through the inner hole of the bushing 9, and the positioning ring sleeve 2 is positioned and placed on the bushing 9. After the graphite bearing is fitted to the bottom surface of the pressure rod 1, it is guided into the positioning ring sleeve 2 through the prism and the guide groove, and the inner hole of the annular protrusion of the pressure rod 1 cooperates with the guide column of the support 3 for guidance.

[0009] The component 2 includes a pressure rod 2 4 and a positioning support 5; the pressure rod 2 4 is basically the same as the pressure rod 1 1 in structure, except that the side wall of the cylindrical body of the pressure rod 2 4 is not provided with a prism, and the inner hole of the annular protrusion on the bottom surface is a square hole, and the pressure rod 2 4 is used to fit another graphite bearing to achieve positioning and press into the bushing 9; the positioning support 5 is cylindrical, and its outer diameter is matched with the inner hole clearance of the short cylinder on one side of the housing combination 8, and two protrusions are arranged on its upper surface along the diameter to cooperate with the two grooves on the bushing 9 to achieve positioning, and the center of the upper surface of the positioning support 5 is coaxial with the square shaped guide column, which is used to pass through the inner hole of the shell combination 8 and cooperate with the square hole of the annular protrusion on the bottom surface of the pressure rod 2 4 to position the relative position of the other graphite bearing and the bushing 9, so that the groove angle of the two graphite bearings is maintained at 90°±10°; when in use, the short cylindrical structure of the shell combination 8 is inserted downward into the positioning support 5, so that the two protrusions on the positioning support 5 are matched with the two grooves of the bushing 9 for positioning, and the graphite bearing is fitted with the pressure rod 2 4 and then placed together in the long cylindrical structure of the shell combination 8, and the square hole on the bottom surface of the pressure rod 2 4 cooperates with the square positioning column of the positioning support 5.

[0010] The clamp includes a fastening component 1 6 and a fastening component 2 7, both of which are cylindrical structures and are respectively placed in the inner holes of the cylindrical structures on both sides of the shell assembly 8, and fit with the bushing 9 and the graphite bearing. The centers of the opposite end faces of the two are made with circular protrusions, and the outer diameter of the circular protrusion matches the inner hole of the graphite bearing. Fastening component 1 6 and fastening component 2 7 are both made with through holes along the center for screws to pass through, and the tail of the screw is screwed into the nut to clamp the two graphite bearings.

[0011] Furthermore, the pressure rod 1 and the pressure rod 2 4 are made of relatively soft materials such as polytetrafluoroethylene to avoid damage to the graphite bearing when pressing it into the bushing 9.

[0012] The method for assembling using the above-mentioned assembly device comprises the following steps:

[0013] Step 1, assemble the first graphite bearing:

[0014] Step 1.1: Place the shell assembly 8 in an electric constant temperature blast drying oven and heat it until the temperature reaches 170°C ± 3°C and then keep it warm for 60±5 minutes.

[0015] Step 1.2, take out the shell assembly 8, put one side of the long columnar structure of the shell assembly 8 downward on the support 3, and position the positioning ring sleeve 2 on the bushing 9, so that the protrusion of the positioning ring sleeve 2 matches and aligns with the groove of the bushing 9; match and align the groove of the first graphite bearing with the protrusion of the bottom surface of the pressure rod 1 so that the two fit together, and the inner hole of the first graphite bearing is fastened to the outer circle of the annular protrusion of the pressure rod 1, and the two are inserted into the positioning ring sleeve 2 together, and the guided positioning is achieved through the prism on the pressure rod 1 and the guide groove on the positioning ring sleeve 2. At the same time, the inner hole of the annular protrusion of the pressure rod 1 matches with the guide column of the support 3 to ensure coaxiality.

[0016] Step 1.3: Use a press to press the first graphite bearing into the bushing 9 to complete the assembly. Component 1 ensures that the angle between the first graphite bearing groove and the bushing 9 groove remains at 30 degrees.

[0017] Step 2: Assemble the second graphite bearing device 2 as follows:

[0018] Step 2.1, after completing the assembly of the first graphite bearing, place the housing assembly 8 together with the first graphite bearing in an electric constant temperature blast drying oven and heat it again. After the temperature reaches 170°C ± 3°C, keep it warm for 60 ± 5 minutes.

[0019] Step 2.2 Take out the shell assembly 8, insert one side of the long cylinder of the shell assembly 8 upward into the positioning support 5, align the two protrusions on the positioning support 5 with the two grooves of the bushing 9, align the groove of the second graphite bearing with the protrusion on the bottom surface of the pressure rod 2 4, make the two fit together, fasten the inner hole of the second graphite bearing to the outer circle of the annular protrusion of the pressure rod 2 4, and put the two together into the long cylindrical structure of the shell assembly 8, and the square hole on the bottom surface of the pressure rod 2 4 matches the square positioning column of the positioning support 5.

[0020] In step 2.3, use a press to press the second graphite bearing into the other side of the bushing 9 to complete the assembly. Component 2 ensures that the groove angles of the two graphite bearings remain at 90°±10°.

[0021] Step 3: Align the fastening components 1 6 and 2 7 with the sides having circular protrusions, match them with the inner holes of the two graphite bearings from both sides of the assembled housing assembly 8, insert the screws and tighten the nuts to complete the clamping, and place them together in an electric constant temperature blast drying oven, heat to 100℃±3℃ and keep warm for 2h; remove them from the heating box and remove the clamp, and store them at ambient temperature for not less than 16 hours.

[0022] The beneficial effect of this utility model is that due to the special structure of a certain type of aircraft fuel pump, existing technology cannot guarantee the installation requirements of graphite bearings. During installation, the graphite bearings cannot be pressed vertically downward, which can easily damage the outer wall of the graphite bearings. In severe cases, the graphite bearings may break, affecting flight safety. The utility model device ensures that the two graphite bearings meet the technical requirements after assembly.

[0023] When the utility model is used, the housing assembly with the bushing is placed in a heating box, and after the temperature reaches (170±3)°C, the temperature is kept for (60±5) minutes. The housing assembly is taken out and the graphite bearing is assembled using an assembly device. The resulting graphite bearing assembly method ensures the working reliability of the fuel pump after the graphite bearing is assembled. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a structural diagram of a component;

[0025] Figure 2 This is the structural diagram of component 2;

[0026] Figure 3 This is the fixture structure diagram;

[0027] Figure 4 Schematic diagram of the installation direction of the graphite bearing, where (a) is a schematic diagram of the installation of the graphite bearing groove relative to the bushing groove, and (b) and (c) are schematic diagrams of the relative angles of the two graphite bearings;

[0028] Figure 5 This is the first bearing assembly diagram;

[0029] Figure 6 Assemble the diagram for the second bearing;

[0030] Figure 7 This is a schematic diagram of the fixture assembly.

[0031] Figure 8 Schematic diagram of component 1.

[0032] Figure 9 This is a schematic diagram of component two.

[0033] Figure 10 Schematic diagram of the fixture assembly.

[0034] In the figure: 1 pressure rod 1; 2 positioning ring; 3 support; 4 pressure rod 2; 5 positioning support; 6 fastening component 1; 7 fastening component 2; 8 housing assembly; 9 bushing. DETAILED DESCRIPTION

[0035] The following is a clear and complete description of the technical solution of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments improved or adjusted by ordinary technicians in this field fall within the scope of protection of the present invention.

[0036] An assembly device for a graphite bearing inside an aircraft fuel pump comprises a first component, a second component and a clamp.

[0037] The component 1 includes a pressure rod 1, a positioning ring 2 and a support 3, as shown in FIG. Figure 1 and Figure 8As shown; the pressure rod 1 is a cylinder made of polytetrafluoroethylene material, and its outer diameter is the same as the outer diameter of the first graphite bearing. Four prisms are evenly distributed on the side wall of the cylinder along the circumference. An annular protrusion is made in the center of the bottom surface of the cylinder. The outer circle of the annular protrusion is tightly matched with the inner hole of the first graphite bearing. The bottom surface of the cylinder is provided with a strip protrusion according to the groove F-shaped surface on the surface of the first graphite bearing, so that the first graphite bearing can fit with the bottom surface of the pressure rod 1 to achieve positioning. At the same time, the pressure rod 1 is also used to fix the first graphite bearing Pressed into the bushing 9; the positioning ring sleeve 2 is annular, and its inner diameter matches the outer diameter of the first graphite bearing and the pressure rod 1 to achieve sliding fit. The inner wall of the positioning ring sleeve 2 is evenly distributed with 4 guide grooves along the circumference, which slide with the prism on the side wall of the pressure rod 1 to achieve positioning fit between the two. The outer diameter of the positioning ring sleeve 2 is consistent with the outer diameter of the bushing 9 in the housing combination 8, and the bottom surface circumference is relatively formed with two protrusions for cooperating with the two grooves at the circumference of the bushing 9 to achieve positioning, and the pressure rod 1 and the positioning ring sleeve 2 are positioned After assembly, the line connecting the strip-shaped protrusion on the bottom of the pressure rod 1 and the line connecting the two protrusions on the bottom of the positioning ring sleeve 2 are 30 degrees, so that the angle between the center line of the groove F on the first graphite bearing and the center line connecting the two grooves at the circumference of the bushing 9 is maintained at 30 degrees; the support 3 is a three-step columnar structure, and the outer diameter increases from top to bottom. The outer diameter of the middle section of the support 3 is matched with the inner diameter of the long columnar structure on one side of the shell assembly 8. The shell assembly 8 is sleeved on the middle section of the support 3 and placed on the lower end of the support 3. The upper section of the support 3 is a guide column , its outer diameter cooperates with the inner hole of the annular protrusion in the center of the bottom surface of the pressure rod 1, and is used to guide the first graphite bearing to be coaxial with the bushing 9; when in use, the long columnar structure of the shell assembly 8 is downwardly sleeved on the support 3, and the upper guide column passes through the inner hole of the bushing 9, and the positioning ring sleeve 2 is positioned and placed on the bushing 9. After the first graphite bearing is fitted to the bottom surface of the pressure rod 1, it is guided into the positioning ring sleeve 2 together through the prism and the guide groove, and the inner hole of the annular protrusion of the pressure rod 1 cooperates with the guide column of the support 3 for guidance.

[0038] The second component includes a second pressure rod 4 and a positioning support 5, as shown in FIG. Figure 2 and Figure 9As shown; the pressure rod 2 4 is made of polytetrafluoroethylene material, which is basically the same as the pressure rod 1 structure, except that the pressure rod 2 4 cylindrical side wall is not provided with a prism, and the inner hole of the annular protrusion on the bottom surface is a square hole, and the pressure rod 2 4 is used to fit the second graphite bearing to achieve positioning and press it into the bushing 9; the positioning support 5 is cylindrical, and its outer diameter is matched with the inner hole clearance of the short cylinder on one side of the housing combination 8, and two protrusions are arranged on its upper surface along the diameter for matching with the two grooves on the bushing 9 to achieve positioning, and the center of the upper surface of the positioning support 5 is a coaxial square guide The column is used to pass through the inner hole of the shell combination 8 and cooperate with the square hole of the annular protrusion on the bottom surface of the pressure rod 2 4 to position the relative position of the second graphite bearing and the bushing 9, so that the groove angle of the two graphite bearings is maintained at 90°±10°; when in use, one side of the short cylindrical structure of the shell combination 8 is downwardly inserted into the positioning support 5, so that the two protrusions on the positioning support 5 are coordinated with the two grooves of the bushing 9 for positioning, and the graphite bearing is fitted with the pressure rod 2 4 and then placed together in the long cylindrical structure of the shell combination 8, and the square hole on the bottom surface of the pressure rod 2 4 cooperates with the square positioning column of the positioning support 5.

[0039] The clamp includes a fastening component 1 6 and a fastening component 2 7, as shown in FIG. Figure 3 and Figure 10 As shown, both are cylindrical structures, which are placed in the inner holes of the cylindrical structures on both sides of the shell assembly 8 respectively, and fit with the bushing 9 and the graphite bearing. The centers of the opposite end faces of the two are made with circular protrusions, and the outer diameter of the circular protrusions matches the inner hole of the graphite bearing. Fastening component 1 6 and fastening component 2 7 are both made with through holes along the center for screws to pass through, and the tail of the screw is screwed into the nut to clamp the two graphite bearings.

[0040] When the above assembly device is used to assemble the graphite bearing, due to the different temperature expansion coefficients of the graphite bearing and the fuel pump housing assembly 8, a thermal assembly method is used for assembly, including the following steps:

[0041] Step 1, assemble the first graphite bearing, such as Figure 5 As shown:

[0042] Step 1.1: Place the shell assembly 8 in an electric constant temperature blast drying oven and heat it until the temperature reaches 170°C ± 3°C and then keep it warm for 60±5 minutes.

[0043] Step 1.2, take out the shell assembly 8, put one side of the long columnar structure of the shell assembly 8 downward on the support 3, and position the positioning ring sleeve 2 on the bushing 9, so that the protrusion of the positioning ring sleeve 2 matches and aligns with the groove of the bushing 9; match and align the groove F of the first graphite bearing with the protrusion on the bottom surface of the pressure rod 1 so that the two fit together, and the inner hole of the first graphite bearing is fastened to the outer circle of the annular protrusion of the pressure rod 1, and the two are inserted into the positioning ring sleeve 2 together, and the guided positioning is achieved through the prism on the pressure rod 1 and the guide groove on the positioning ring sleeve 2. At the same time, the inner hole of the annular protrusion of the pressure rod 1 matches with the guide column of the support 3 to ensure coaxiality.

[0044] In step 1.3, use a press to press the first graphite bearing into the bushing 9 to complete the assembly. Component 1 ensures that the angle of the first graphite bearing groove F relative to the bushing 9 is maintained at 30°.

[0045] Step 2: The method for assembling the second graphite bearing device 2 is as follows: Figure 6 As shown:

[0046] Step 2.1, after completing the assembly of the first graphite bearing, place the housing assembly 8 together with the first graphite bearing in an electric constant temperature blast drying oven and heat it again. After the temperature reaches 170°C ± 3°C, keep it warm for 60 ± 5 minutes.

[0047] Step 2.2 Take out the shell assembly 8, insert one side of the long cylinder of the shell assembly 8 upward into the positioning support 5, align the two protrusions on the positioning support 5 with the two grooves of the bushing 9, align the groove E of the second graphite bearing with the protrusion on the bottom surface of the pressure rod 2 4, make the two fit together, fasten the inner hole of the second graphite bearing to the outer circle of the annular protrusion of the pressure rod 2 4, and put the two together into the long cylindrical structure of the shell assembly 8, and the square hole on the bottom surface of the pressure rod 2 4 matches the square positioning column of the positioning support 5.

[0048] In step 2.3, use a press to press the second graphite bearing into the other side of the bushing 9 to complete the assembly. Component 2 ensures that the groove angles of the two graphite bearings remain at 90°±10°.

[0049] Step 3, such as Figure 7 As shown, fastening component 1 6 and fastening component 2 7 are positioned with the circular protrusions facing each other, and after matching the two sides of the assembled housing assembly 8 with the inner holes of the two graphite bearings, insert the screws and tighten the nuts to complete the clamping. Put them together in an electric constant temperature blast drying oven, heat them to 100℃±3℃ and keep them warm for 2h; take them out from the heating oven and remove the fixture, and store them at ambient temperature for not less than 16 hours.

[0050] The above-described embodiments merely express the implementation methods of the present invention, but they should not be understood as limiting the scope of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. An assembly device for graphite bearings inside aircraft fuel pumps, characterized in that: The assembly device includes component one, component two and a fixture; The component 1 comprises a pressure rod 1 (1), a positioning ring sleeve (2) and a support (3); the pressure rod 1 (1) is a cylinder, the outer diameter of which is the same as the outer diameter of the graphite bearing, and the bottom surface is arranged according to the surface of the graphite bearing to achieve positioning and fitting of the two, and is used to press the graphite bearing into the bushing (9), and a ring protrusion is formed in the center of the bottom surface of the cylinder, and the outer circle of the ring protrusion is tightly matched with the inner hole of the graphite bearing; the positioning ring sleeve (2) is annular, and its inner diameter matches and positions the outer diameter of the pressure rod 1 (1), and the outer diameter of the positioning ring sleeve (2) is the same as the outer diameter of the bushing (9) in the housing assembly (8). and is positioned and matched with the bushing (9), and after the pressure rod (1) and the positioning ring sleeve (2) are positioned and combined, the angle between the center line of the groove on the graphite bearing and the center line of the two grooves at the circumference of the bushing (9) is maintained at 30°; the support (3) is a three-step columnar structure, and the outer diameter increases from top to bottom, the outer diameter of the middle section of the support (3) is matched with the inner diameter of the long columnar structure on one side of the shell combination (8), and the upper section of the support (3) is a guide column, the outer diameter of which is matched with the inner hole of the annular protrusion at the center of the bottom surface of the pressure rod (1), so as to realize the coaxiality of the graphite bearing and the bushing (9); The second component includes a second pressure rod (4) and a positioning support (5); the second pressure rod (4) is a cylinder, the outer diameter of which is the same as the outer diameter of the graphite bearing, and the bottom surface is set according to the surface of the graphite bearing to achieve positioning and fitting between the two, and is used to press the other graphite bearing into the bushing (9). The center of the bottom surface of the cylinder is made into an annular protrusion, the outer circle of the annular protrusion is tightly matched with the inner hole of the graphite bearing, and the inner hole of the annular protrusion is a square hole; the positioning support (5) is cylindrical, the outer diameter of which is gap-matched with the inner hole of the short cylinder on one side of the shell combination (8), and the upper surface thereof is matched with the bushing (9) to achieve positioning, and the center of the upper surface of the positioning support (5) is made into a square guide column, which is used to pass through the inner hole of the shell combination (8) and match with the square hole of the annular protrusion on the bottom surface of the second pressure rod (4), to position the other graphite bearing relative to the bushing (9), so that the groove angle of the two graphite bearings is maintained at 90°±10°; The clamp comprises a fastening component 1 (6) and a fastening component 2 (7), both of which are cylindrical structures and are respectively placed in the inner holes of the cylindrical structures on both sides of the shell assembly (8). The centers of the opposite end faces of the two are formed with circular protrusions that match the inner holes of the graphite bearing. Both are formed with through holes along the center for screws to pass through the matching nuts to achieve clamping.

2. The assembly device for a graphite bearing inside an aircraft fuel pump according to claim 1, characterized in that: The cylindrical side wall of the pressure rod (1) has four prisms evenly distributed along the circumference, and the inner wall of the positioning ring sleeve (2) has four guide grooves evenly distributed along the circumference, which slide and cooperate with the prisms on the side wall of the pressure rod (1) to achieve positioning cooperation between the two.

3. The assembly device for a graphite bearing inside an aircraft fuel pump according to claim 1, characterized in that: The bottom surfaces of the pressure rod one (1) and the pressure rod two (4) are both provided with strip-shaped protrusions according to the surface profile of the graphite bearing, which cooperate with the surface grooves of the graphite bearing, so that the graphite bearing can fit with the bottom surface of the pressure rod one (1) or the pressure rod two (4) to achieve positioning.

4. The assembly device for a graphite bearing inside an aircraft fuel pump according to claim 1, characterized in that: The bottom surface of the positioning ring sleeve (2) is provided with two protrusions on the circumference thereof, which are used to cooperate with two grooves on the circumference of the bushing (9) to achieve positioning.

5. The assembly device for a graphite bearing inside an aircraft fuel pump according to claim 1, characterized in that: The upper surface of the positioning support (5) is provided with two protrusions which are opposite to each other along the diameter and are used to cooperate with the two grooves on the bushing (9) to achieve positioning.

6. The assembly device for a graphite bearing inside an aircraft fuel pump according to claim 1, characterized in that: The pressure rod 1 (1) and the pressure rod 2 (4) are made of polytetrafluoroethylene material.

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