Main bearing pin connecting device for aero-engine

Abstract

The invention belongs to the technical field of engine bearing pins, and particularly relates to a main bearing pin connecting device for an aero-engine, which comprises a piston cylinder, pin seat holes are symmetrically formed in the side wall of the piston cylinder, piston pin pipes are inserted into the inner sides of the pin seat holes, and a connecting rod assembly sleeves the outer side of the middle of each piston pin pipe. The connecting rod assembly comprises a connecting rod small-end cylinder, a first connecting plate, a second connecting plate, a connecting rod bolt and a connecting rod body, a connecting column is fixed to the top of the connecting rod bolt, a plurality of positioning latches are fixed to the outer wall of the connecting column, and a limiting assembly is fixed to the outer wall of the connecting rod small-end cylinder; the limiting assembly comprises a fixing cylinder, a supporting spring, a rectangular plate, a fixing plate and a limiting insertion plate. One end of the limiting inserting plate is inserted between the adjacent positioning clamping teeth under pushing of the supporting spring, so that the positioning clamping teeth are shielded and limited through the limiting inserting plate, the bolt rotation condition is avoided, and the using stability of the piston pin pipe is improved.

Description

Technical Field

[0001] The invention relates to the technical field of engine bearing pins, and in particular to a main bearing pin connecting device for an aero-engine. Background Art

[0002] Aircraft engines are highly complex and sophisticated thermal machinery that provide aircraft with the power they need to fly. There are two main types of modern aircraft engines: "piston engines" and "jet engines". "Piston engines" are commonly used in low-speed, small, and short-range aircraft; "jet engines" are commonly used in high-speed, large (medium) and long (medium) range aircraft. There are multiple load-bearing components in the engine, and the piston pin is a relatively important load-bearing pin. The piston engine, also known as a reciprocating engine, is an engine that uses one or more pistons to convert pressure into rotational kinetic energy. The piston pin is the main component that connects the piston and the connecting rod, and transmits the force between the piston and the connecting rod. The piston pin bears periodic impact loads, and it itself swings and works under very poor lubrication conditions. Therefore, the piston pin is required to have sufficient strength and rigidity, good surface toughness, good wear resistance, and light weight. The piston pin is generally made into a hollow cylinder, made of low-carbon steel and low-carbon alloy steel, and the outer surface is carburized and quenched to increase the hardness. After fine machining, it is polished and has high dimensional accuracy and surface finish.

[0003] There are two ways to connect the piston pin to the piston pin seat hole and the connecting rod small end bushing hole: full floating connection and semi-floating connection. Semi-floating connection means that one part of the piston pin, the piston pin seat hole and the connecting rod small end hole is fixed and the other part is floating. Generally, the piston pin is fixed to the connecting rod small end, and the fixing method is such as bolt fixing. Since there is no relative movement between the piston pin and the connecting rod, there is no need for a retaining ring to limit the axial position of the piston pin, that is, the piston pin of the semi-floating connection has no retaining ring, and there is no bushing at the connecting rod small end. The semi-floating piston pin can reduce engine noise and eliminate accidents that may be caused by retaining rings.

[0004] However, the semi-floating connection of the piston pin is currently mainly connected and fixed by bolts. During the operation of the engine, the reciprocating movement of the piston is likely to affect the bolts, causing the bolts to rotate after movement, resulting in the bolts becoming loose. After the bolts are loosened, the connection between the connecting rod and the piston pin is likely to become loose, thereby affecting the stability of the piston pin connection and the normal operation of the engine.

[0005] Therefore, a main bearing pin connection device for an aircraft engine is proposed, which has high connection strength, avoids loosening, and is easy to operate. Summary of the invention

[0006] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a main bearing pin connection device for an aircraft engine, which has the characteristics of high connection strength and stable connection. When the connecting rod body and the piston pin tube are fixedly sleeved by the connecting rod bolt, a limit assembly is arranged on the small end tube of the connecting rod, and the limit plug plate of the limit assembly is inserted into one side of the positioning tooth at the top of the connecting rod bolt. The limit plug plate is inserted between adjacent positioning teeth to limit and block it. When the piston runs and the bolt is loosened, the bolt that wants to rotate cannot be rotated due to the obstruction of the limit plug plate, thereby avoiding the bolt from rotating and loosening, improving the stability of the bolt connection, and thus improving the connection strength of the connection between the piston pin tube and the connecting rod.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a main load-bearing pin connection device for an aircraft engine, comprising a piston cylinder, wherein the side wall of the piston cylinder is symmetrically provided with pin seat holes, a piston pin tube is inserted into the inner side of the pin seat hole, a connecting rod assembly is sleeved on the middle outer side of the piston pin tube, the connecting rod assembly comprises a connecting rod small head cylinder, a first connecting plate, a second connecting plate, a connecting rod bolt and a connecting rod body, the connecting rod small head cylinder is sleeved on the middle outer side of the piston pin tube, a connecting rod body is fixed to the bottom of the connecting rod small head cylinder, a separation groove is provided on the outer wall of the connecting rod small head cylinder, a first connecting plate is fixed above the separation groove, a second connecting plate is fixed below the separation groove, the first connecting plate and A connecting rod bolt is passed through the second connecting plate, and a connecting column is fixed on the top of the connecting rod bolt, and a positioning tooth is fixed on the outer wall of the connecting column. There are multiple positioning teeth, and a limiting assembly is fixed to the outer wall of the connecting rod small head tube. The limiting assembly includes a fixing tube, a supporting spring, a rectangular plate, a fixing plate and a limiting plug plate. One end of the fixing tube is fixed on the connecting rod small head tube, and a supporting spring is fixed to the inner end of the fixing tube, and a rectangular plate is fixed to one end of the support spring. A fixing plate is fixed to the side wall of one end of the rectangular plate, and a limiting plug plate is fixed to one side wall of the fixing plate. The positioning tooth is located on one side of the other end of the fixing tube, and one end of the limiting plug plate is inserted into one side of the positioning tooth.

[0008] As a preferred technical solution of the main load-bearing pin connection device for an aircraft engine of the present invention, a first positioning arc plate is fixed in the middle of the outer wall of the piston pin tube, and first positioning arc grooves are symmetrically provided on both sides of the first positioning arc plate; a second positioning arc groove is fixed in the middle of the inner wall of the connecting rod small end tube, and second positioning arc plates are symmetrically fixed on both sides of the second positioning arc groove.

[0009] As a preferred technical solution of a main bearing pin connection device for an aircraft engine of the present invention, the first positioning arc plate is engaged with the inner side of the second positioning arc groove, and the second positioning arc plate is engaged with the inner side of the first positioning arc groove.

[0010] As a preferred technical solution of a main bearing pin connection device for an aircraft engine of the present invention, the thickness dimension of one end of the first positioning arc plate is smaller than the thickness dimension of the other end, and the depth dimension of one end of the first positioning arc groove is smaller than the depth dimension of the other end.

[0011] As a preferred technical solution of a main bearing pin connection device for an aircraft engine of the present invention, the size of the first positioning arc plate is adapted to the inner size of the second positioning arc groove, and the size of the second positioning arc plate is adapted to the inner size of the first positioning arc groove.

[0012] As a preferred technical solution of a main bearing pin connection device for an aircraft engine of the present invention, a threaded hole is provided on the first connecting plate, the connecting rod bolt is threadedly connected to the inner side of the threaded hole, and the second connecting plate has the same structure as the first connecting plate.

[0013] As a preferred technical solution of a main bearing pin connection device for an aircraft engine of the present invention, a side wall of the fixed cylinder is provided with a slide groove, a connecting rod passes through the inner side of the slide groove, a shift block is fixed to one end of the connecting rod, and the shift block is located on the outside of the fixed cylinder, and a stop block is fixed to the other end of the connecting rod, and the stop block is located on one side of the rectangular plate.

[0014] As a preferred technical solution of the main bearing pin connection device for an aircraft engine of the present invention, a support tube is fixed to one side of the pin seat hole, and the support tube is sleeved on the outer side of the piston pin tube.

[0015] As a preferred technical solution of a main bearing pin connection device for an aircraft engine of the present invention, the size of the shift block and the size of the stop block are both larger than the width of the slide groove.

[0016] As a preferred technical solution of the main bearing pin connection device for an aircraft engine of the present invention, the size of the rectangular plate is adapted to the inner size of the fixing tube.

[0017] Compared with the prior art, the present invention has the following beneficial effects: During use, the present invention provides a piston pin tube on the inner side of the piston of the aircraft engine through the setting of the limit assembly and the connecting rod bolt. The piston pin tube serves as the load-bearing pin of the engine. The connecting rod is connected with the engine connecting rod through the piston pin tube to realize that the connecting rod can drive the piston to move. A first connecting plate and a second connecting plate are provided on the small connecting rod head tube at the top of the connecting rod. The connecting rod bolt passes through the two connecting plates. The two connecting plates are brought close to each other by twisting the connecting rod bolt, so that the small connecting rod head tube is tightly closed, thereby realizing the clamping of the small connecting rod head tube to the piston pin tube. A connecting column is provided at the top of the connecting rod bolt, a plurality of positioning teeth are provided on the outer wall of the connecting column, and a limit assembly is provided on the small connecting rod head tube. The limit plug plate of the limit assembly is inserted between adjacent positioning teeth under the push of the support spring, so that the positioning teeth are blocked and limited by the limit plug plate, thereby avoiding the situation that the bolt rotates, improving the stability of the bolt connection, and improving the stability of the use of the piston pin tube. By arranging a first positioning arc groove and a first positioning arc plate on the outer wall of the piston pin tube, and arranging a second positioning arc plate and a second positioning arc groove on the inner wall of the connecting rod small end tube, the first positioning arc plate and the second positioning arc groove are engaged, and the second positioning arc plate and the first positioning arc groove are engaged, and when the connecting rod small end tube and the piston pin tube are fixedly sleeved, the engagement of the arc plate and the arc groove improves the strength of the connection between the piston pin tube and the connecting rod small end tube, avoids the situation that the piston pin tube is prone to axial movement after the piston is used for a long time, and further improves the connection stability of the piston pin tube and the connecting rod, the structure is simple and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 is a three-dimensional cross-sectional view of the present invention; Figure 3 It is a three-dimensional schematic diagram of the piston pin tube and connecting rod assembly of the present invention; Figure 4 It is a three-dimensional schematic diagram of a connecting rod assembly of the present invention; Figure 5 It is a three-dimensional schematic diagram of the piston pin tube of the present invention; Figure 6 It is a three-dimensional schematic diagram of the connecting rod small end tube of the present invention; Figure 7 For the present invention Figure 6 The enlarged schematic diagram of point A in the middle; Figure 8 For the present invention Figure 6 A magnified schematic diagram of point B in the middle.

[0019] In the figure: 1. piston cylinder; 11. pin seat hole; 12. support cylinder; 2. piston pin tube; 21. first positioning arc plate; 22. first positioning arc groove; 3. connecting rod assembly; 31. connecting rod small end cylinder; 311. separation groove; 312. second positioning arc groove; 313. second positioning arc plate; 32. first connecting plate; 321. threaded hole; 33. second connecting plate; 34. connecting rod bolt; 341. connecting column; 342. positioning tooth; 35. limiting assembly; 351. fixing cylinder; 352. slide groove; 353. supporting spring; 354. rectangular plate; 355. fixing plate; 356. limiting plug plate; 357. connecting rod; 358. shift block; 359. stop block; 36. connecting rod body. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0023] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other. Example

[0024] Reference Figure 1-8The present invention provides the following technical solutions: a main bearing pin connection device for an aircraft engine, comprising a piston cylinder 1, a pin seat hole 11 is symmetrically provided on the side wall of the piston cylinder 1, a piston pin tube 2 is inserted into the inner side of the pin seat hole 11; a support cylinder 12 is fixed to one side of the pin seat hole 11, and the support cylinder 12 is sleeved on the outer side of the piston pin tube 2; a connecting rod assembly 3 is sleeved on the outer side of the middle part of the piston pin tube 2, and the connecting rod assembly 3 includes a connecting rod small head cylinder 31, a first connecting plate 32, a second connecting plate 33, a connecting rod bolt 34 and a connecting rod body 36, the connecting rod small head cylinder 31 is sleeved on the outer side of the middle part of the piston pin tube 2, the connecting rod small head cylinder 31 has a certain elasticity and can be sleeved on the outer side of the piston pin tube 2, a connecting rod body 36 is fixed to the bottom of the connecting rod small head cylinder 31, and a separation groove 311 is provided on the outer wall of the connecting rod small head cylinder 31, and the upper part of the separation groove 311 A first connecting plate 32 is fixed on the side, and a second connecting plate 33 is fixed below the dividing groove 311. Connecting rod bolts 34 are penetrated through the first connecting plate 32 and the second connecting plate 33. By tightening the connecting rod bolts 34, the two connecting plates can be pulled close together, so that the connecting rod small end tube 31 is tightly sleeved on the outer side of the piston pin tube 2; a threaded hole 321 is provided on the first connecting plate 32, and the connecting rod bolt 34 is threadedly connected to the inner side of the threaded hole 321. The second connecting plate 33 has the same structure as the first connecting plate 32; the connection method and use principle of the above-mentioned piston cylinder 1, piston pin tube 2 and connecting rod assembly 3 belong to the prior art, and can refer to the engine piston structure in the prior art, so it is not repeated here. The connecting rod assembly 3 and the piston cylinder 1 are connected by the piston pin tube 2, so that the connecting rod can drive the piston cylinder 1 to reciprocate; Reference Figure 3 , Figure 6 , Figure 7 and Figure 8As shown, specifically, a connecting column 341 is fixed on the top of the connecting rod bolt 34, and a positioning tooth 342 is fixed on the outer wall of the connecting column 341. There are multiple positioning teeth 342, and the end thickness of each positioning tooth 342 is relatively thin. A limiting assembly 35 is fixed on the outer wall of the connecting rod small end tube 31. The limiting assembly 35 includes a fixing tube 351, a supporting spring 353, a rectangular plate 354, a fixing plate 355 and a limiting plug plate 356. One end of the fixing tube 351 is fixed on the connecting rod small end tube 31, and a supporting spring 353 is fixed on the inner end of the fixing tube 351. A rectangular plate 354 is fixed on one end of the supporting spring 353, and the supporting spring 353 can push the rectangular plate 354 to move; the size of the rectangular plate 354 is adapted to the inner size of the fixing tube 351; the rectangular plate 354 A fixing plate 355 is fixed to the side wall of one end of the fixing plate 355, and a limiting plug plate 356 is fixed to one side wall of the fixing plate 355. One end of the limiting plug plate 356 is thinner, and the positioning tooth 342 is located on the other end of the fixing tube 351. One end of the limiting plug plate 356 is inserted into one side of the positioning tooth 342. After the connecting rod small end tube 31 is fixedly sleeved on the outer side of the piston pin tube 2 by the connecting rod bolt 34, the limiting plug plate 356 is supported by the supporting spring 353 to insert the limiting plug plate 356 into one side of the positioning tooth 342 at the end of the connecting rod bolt 34. The limiting plug plate 356 blocks and limits the positioning tooth 342, thereby preventing the connecting rod bolt 34 from rotating loose, improving the connection stability of the piston pin tube 2 and the connecting rod assembly 3, and thus improving the stability of the engine operation.

[0025] Reference Figure 8 As shown, specifically, a side wall of the fixed cylinder 351 is provided with a slide groove 352, and a connecting rod 357 passes through the inner side of the slide groove 352. A shift block 358 is fixed to one end of the connecting rod 357, and the shift block 358 is located on the outer side of the fixed cylinder 351. The shift block 358 can drive the stopper 359 to move. A stopper 359 is fixed to the other end of the connecting rod 357, and the stopper 359 is located on one side of the rectangular plate 354; the size of the shift block 358 and the size of the stopper 359 are both larger than the width of the slide groove 352; when the present scheme is in use, the staff can use the shift block 358 to shift the stopper 359, so that the stopper 359 drives the rectangular plate 354 to move on the inner side of the fixed cylinder 351, so that the limiting plug plate 356 leaves from above the threaded hole 321, thereby realizing the smooth installation and disassembly of the connecting rod bolt 34, and the operation is convenient.

[0026] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, specifically, a first positioning arc plate 21 is fixed to the middle of the outer wall of the piston pin tube 2, and first positioning arc grooves 22 are symmetrically provided on both sides of the first positioning arc plate 21, a second positioning arc groove 312 is fixed to the middle of the inner wall of the connecting rod small end tube 31, and second positioning arc plates 313 are symmetrically fixed to both sides of the second positioning arc groove 312; the first positioning arc plate 21 is clamped on the inner side of the second positioning arc groove 312, and the second positioning arc plate 313 is clamped on the inner side of the first positioning arc groove 22, and the connection strength between the piston pin tube 2 and the connecting rod assembly 3 is enhanced by the clamping of the arc plate and the arc groove; the thickness dimension of one end of the first positioning arc plate 21 is smaller than the thickness dimension of the other end, and the depth dimension of one end of the first positioning arc groove 22 is smaller than the depth dimension of the other end, By setting one end with a smaller thickness and the other end with a larger thickness, and the end with a larger thickness is close to the side of the dividing groove 311, the small end tube 31 of the connecting rod can be sleeved on the outside of the piston pin tube 2 without expanding a large range; the size of the first positioning arc plate 21 is adapted to the inner size of the second positioning arc groove 312, and the size of the second positioning arc plate 313 is adapted to the inner size of the first positioning arc groove 22; after the connecting rod assembly 3 is sleeved on the piston pin tube 2, the arc plate and arc groove on the inner side of the small end tube 31 of the connecting rod are respectively engaged with the arc groove and arc plate on the outer wall of the piston pin tube 2, so as to enhance the strength of the connection between the piston pin tube 2 and the connecting rod, avoid axial movement of the piston pin tube 2, and further improve the stability of the use of the piston pin tube 2.

[0027] The use process and working principle of the present invention are as follows: When the present invention is used, the piston pin tube 2 is inserted into the inner side of the piston cylinder 1, so that the connecting rod small end tube 31 of the connecting rod assembly 3 is sleeved on the outer side of the middle part of the piston pin tube 2, so that the arc plate and arc groove on the inner wall of the connecting rod small end tube 31 are aligned with the arc groove and arc plate on the outer wall of the piston pin tube 2, and then the operator tightens the connecting rod bolt 34 on the two connecting plates on the connecting rod small end tube 31, so that the two connecting plates are close to each other, thereby realizing the clamping of the connecting rod small end tube 31 on the piston pin tube 2, and at the same time The strength of the connection between the piston pin tube 2 and the connecting rod is enhanced by the mutual engagement of the arc plate and the arc groove. After the connecting rod bolt 34 is tightened, the limiting plug plate 356 on the outer wall of the connecting rod small end tube 31 moves and is inserted into the side of the positioning tooth 342 at the end of the connecting rod bolt 34 under the support of the support spring 353, thereby blocking and limiting the positioning tooth 342, preventing the connecting rod bolt 34 from loosening and rotating during the operation of the piston, thereby improving the connection stability of the piston pin tube 2 as the main load-bearing pin, thereby improving the stability of the engine operation.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific embodiments, or to perform equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of the present invention, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. A main bearing pin connection device for an aircraft engine, comprising a piston cylinder (1), characterized in that: The side wall of the piston cylinder (1) is symmetrically provided with pin seat holes (11), the inner side of the pin seat hole (11) is plugged with a piston pin tube (2), the middle outer side of the piston pin tube (2) is sleeved with a connecting rod assembly (3), the connecting rod assembly (3) comprises a connecting rod small end tube (31), a first connecting plate (32), a second connecting plate (33), a connecting rod bolt (34) and a connecting rod body (36), the connecting rod small end tube (31) is sleeved with the middle outer side of the piston pin tube (2), and ...). A connecting rod body (36) is fixed at the bottom of the connecting rod small end tube (31), a separation groove (311) is provided on the outer wall of the connecting rod small end tube (31), a first connecting plate (32) is fixed above the separation groove (311), a second connecting plate (33) is fixed below the separation groove (311), connecting rod bolts (34) are passed through the first connecting plate (32) and the second connecting plate (33), and a connecting column (341) is fixed on the top of the connecting rod bolt (34). ), a positioning tooth (342) is fixed on the outer wall of the connecting column (341), and a plurality of the positioning tooth (342) are provided; a limiting assembly (35) is fixed on the outer wall of the connecting rod small end tube (31), and the limiting assembly (35) comprises a fixing tube (351), a supporting spring (353), a rectangular plate (354), a fixing plate (355), and a limiting plug plate (356); one end of the fixing tube (351) is fixed on the connecting rod small end tube (31), and the fixing tube (351) is fixed on the connecting rod small end tube (31). A support spring (353) is fixed to one end of the inner side of the fixing tube (351), a rectangular plate (354) is fixed to one end of the support spring (353), a fixing plate (355) is fixed to one end side wall of the rectangular plate (354), a limiting plug plate (356) is fixed to one side wall of the fixing plate (355), the positioning tooth (342) is located at one side of the other end of the fixing tube (351), and one end of the limiting plug plate (356) is plugged into one side of the positioning tooth (342).

2. A main bearing pin connection device for an aircraft engine according to claim 1, characterized in that: A first positioning arc plate (21) is fixed to the middle of the outer wall of the piston pin tube (2), and first positioning arc grooves (22) are symmetrically provided on both sides of the first positioning arc plate (21). A second positioning arc groove (312) is fixed to the middle of the inner wall of the connecting rod small end tube (31), and second positioning arc plates (313) are symmetrically fixed to both sides of the second positioning arc groove (312).

3. A main bearing pin connection device for an aircraft engine according to claim 2, characterized in that: The first positioning arc plate (21) is engaged with the inner side of the second positioning arc groove (312), and the second positioning arc plate (313) is engaged with the inner side of the first positioning arc groove (22).

4. A main bearing pin connection device for an aircraft engine according to claim 3, characterized in that: The thickness dimension of one end of the first positioning arc plate (21) is smaller than the thickness dimension of the other end, and the depth dimension of one end of the first positioning arc groove (22) is smaller than the depth dimension of the other end.

5. A main bearing pin connection device for an aircraft engine according to claim 4, characterized in that: The size of the first positioning arc plate (21) matches the inner size of the second positioning arc groove (312), and the size of the second positioning arc plate (313) matches the inner size of the first positioning arc groove (22).

6. A main bearing pin connection device for an aircraft engine according to claim 5, characterized in that: The first connecting plate (32) is provided with a threaded hole (321), the connecting rod bolt (34) is threadedly connected to the inner side of the threaded hole (321), and the second connecting plate (33) and the first connecting plate (32) have the same structure.

7. A main bearing pin connection device for an aircraft engine according to claim 6, characterized in that: A sliding groove (352) is provided on one side wall of the fixed cylinder (351), a connecting rod (357) passes through the inner side of the sliding groove (352), a shifting block (358) is fixed to one end of the connecting rod (357), the shifting block (358) is located outside the fixed cylinder (351), and a stopper (359) is fixed to the other end of the connecting rod (357), the stopper (359) is located on one side of the rectangular plate (354).

8. A main bearing pin connection device for an aircraft engine according to claim 7, characterized in that: A support tube (12) is fixed to one side of the pin seat hole (11), and the support tube (12) is sleeved on the outside of the piston pin tube (2).

9. A main bearing pin connection device for an aircraft engine according to claim 8, characterized in that: The size of the shift block (358) and the size of the stop block (359) are both greater than the width of the slide groove (352).

10. A main bearing pin connection device for an aircraft engine according to claim 9, characterized in that: The size of the rectangular plate (354) matches the inner size of the fixing cylinder (351).

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