Driving gear easy to disassemble, transmission shaft structure of driving gear and disassembling method

Abstract

The invention relates to the field of aero-engine part repair, in particular to a driving gear easy to decompose, a transmission shaft structure of the driving gear and a decomposition method, in this way, an elastic clamping ring is shrunk during decomposition by artificially manufacturing a decomposition chamfer, and a transmission shaft is smoothly disengaged from an installation position of the transmission shaft; the driving gear and the transmission shaft are prevented from being damaged by clamping stagnation in the decomposition process due to the fact that the original driving gear has no chamfer or the elastic clamping ring cannot contract due to abrasive dust accumulation. During decomposition, the decomposition sheet is placed in the groove of the driving gear, the transmission shaft is pressed to be fixed, then the end face of the transmission shaft is knocked through the bakelite end of the double-face hammer, the transmission shaft can be smoothly decomposed, the decomposition rejection rate of the driving gear and the transmission shaft can be reduced from about 10% to 0, and the repair cost is greatly saved. And on the other hand, efficient and high-quality decomposition of the driving gear assembly is achieved through manual construction of the decomposition chamfer, the decomposition quality is guaranteed, the decomposition efficiency is improved, and the repair and part replacement cost of an enterprise is greatly saved.

Description

Technical Field

[0001] The invention relates to the field of repairing aircraft engine parts, and in particular to an easily disassembled driving gear and a transmission shaft structure thereof and a disassembly method. Background Art

[0002] The main fuel regulator is the core control accessory of the aircraft engine. It is mainly used to reliably control the engine at different flight altitudes, speeds, atmospheric temperatures and pressures to ensure stable operation of the engine under various conditions. As one of the main control components of the main fuel pump regulator, the oil pump assembly is mainly used to provide the oil supply required for the main fuel pump regulator to work. Its core control unit is the main and driven gear assembly.

[0003] The driving gear assembly is driven by the engine accessory case and consists of a transmission shaft, a circlip and a driving gear. The circlip is installed in the retaining ring groove of the transmission shaft. When the engine is working, the right end of the transmission shaft is inserted into the accessory case gear and rotates at high speed. The left end of the transmission shaft is limited by the circlip and drives the driving gear to rotate.

[0004] When overhauling the main fuel pump regulator, the drive shaft must be disassembled from the driving gear. The driving gear itself is designed with a disassembly chamfer for the circlip, which is used to shrink the circlip when the drive shaft is struck from the left side, thereby disassembling the drive shaft with the circlip.

[0005] Generally, wear debris will be generated at the contact point between the driving gear, the transmission shaft and the circlip. Since the wear debris is directly exposed to air, rust mud will form when the engine works for a long time. The rust mud will cause the transmission shaft to get stuck or the shrinkage space of the circlip to be limited, making it impossible to disassemble the transmission shaft from the driving gear or disassemble it and scrap it. Summary of the invention

[0006] In view of the above problems, the present invention provides an easily disassembled driving gear and a transmission shaft structure thereof and a disassembly method.

[0007] The technical solution adopted is a driving gear and its transmission shaft structure that is easy to disassemble, including a transmission shaft and a driving gear, the right end of the transmission shaft is inserted into the accessory case gear, the left end of the transmission shaft is limited by an elastic retaining ring and drives the driving gear to rotate, and a limiting component and a disassembly guide mechanism are also provided, the limiting component is arranged at the right end of the transmission shaft, and the disassembly guide mechanism is arranged below the limiting component.

[0008] Optionally, the limiting component includes a leather cup, a leather cup frame and a semicircular block, wherein the semicircular block is arranged on one side of the leather cup, and the leather cup abuts against the left end of the transmission shaft through the semicircular block; The leather cup frame is arranged on the other side of the leather cup.

[0009] Optionally, the limiting component further includes a pressure plate with a hole and a semicircular block with a hole, wherein the pressure plate with a hole and the semicircular block with a hole are arranged on one side of the leather cup and on the same side as the leather cup frame; The semicircular block with holes abuts against the leather cup frame; The hole pressure plate covers the semicircular block with holes.

[0010] Optionally, a conical spring is further arranged between the perforated pressure plate and the perforated semicircular block.

[0011] Optionally, a wire retaining ring is provided at the right end of the transmission shaft.

[0012] Optionally, the decomposition guide mechanism includes an arc-shaped bottom plate and spline teeth, and the spline teeth are arranged at the chamfered end of the arc-shaped bottom plate.

[0013] Optionally, the chamfered end of the arc-shaped bottom sheet faces inward, the flush ring abuts against a groove in the driving gear, and there are three arc-shaped bottom sheets in total.

[0014] Optionally, the thickness of the spline teeth from the tooth root to the outer circle is 1 mm, and the width is 6 mm.

[0015] The present application also provides a method for disassembling a driving gear and its transmission shaft based on a driving gear and its transmission shaft structure that are easy to disassemble, comprising the following steps: S1. Disassemble the driving gear assembly according to the process to retain the transmission shaft, elastic retaining ring and driving gear; S2. The three decomposition guide mechanisms are evenly placed, wherein the chamfered end of the arc-shaped film faces inward, and the flush circle of the arc-shaped film abuts against the groove in the driving gear; S3. Place the driving gear assembly on the bracket, and use the bakelite end of a double-sided hammer to knock on the end face of the transmission shaft to disassemble the lower transmission shaft.

[0016] Optionally, the decomposition guide mechanism is obtained by processing the scrapped driving gear, and the processing method is to perform circumferential turning along the center line of the scrapped driving gear, and the thickness from the tooth root to the outer circle after processing is 1 mm; Cut the turning part perpendicular to the center line of the driving gear, with a cutting width of 6mm; The cut parts are separated and cut along the tooth roots to form three arc-shaped bottom plates, each with four spline teeth.

[0017] The beneficial effects of the present invention are: On the one hand, a driving gear and its transmission shaft structure that are easy to disassemble are provided. By artificially manufacturing a disassembly chamfer, the elastic retaining ring shrinks during disassembly, and the transmission shaft smoothly disengages from its installation position, avoiding the damage to the driving gear and the transmission shaft caused by the elastic retaining ring being unable to shrink due to the original driving gear without a manufacturing chamfer or the accumulation of wear debris. During disassembly, the three disassembly pieces of the disassembly device are placed in the groove of the driving gear, and the transmission shaft is pressed to fix it. Then, the end face of the transmission shaft is knocked by the bakelite end of the double-sided hammer, and the transmission shaft can be smoothly disassembled. The disassembly device and method can reduce the disassembly scrap rate of the driving gear and the transmission shaft from about 10% to 0, greatly saving the repair cost.

[0018] On the other hand, in order to break through the shortcomings of the original disassembly method, when the original active gear disassembly chamfer failed to close the elastic retaining ring, a new way was found. By artificially constructing the disassembly chamfer, efficient and high-quality disassembly of the active gear assembly was achieved, which not only ensured the disassembly quality, but also improved the disassembly efficiency, greatly saving the company's repair and replacement costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram showing an easily disassembled driving gear and its transmission shaft structure; Figure 2 A schematic diagram showing the chamfer structure of the tooth profile of the active gear; Figure 3 Represents a decomposition schematic diagram; Figure 4 A schematic diagram showing the structure of the decomposed guide mechanism; Figure 5 Indicates a physical picture.

[0020] The accompanying drawings are marked as follows: 1 is a leather cup, 2 is a semicircular block, 3 is a driving gear, 4 is a wire retaining ring, 5 is a transmission shaft, 6 is an elastic retaining ring, 7 is a conical spring, 8 is a semicircular block with a hole, 9 is a pressure plate with a hole, 10 is a leather cup frame, 11 is an arc bottom plate, and 12 is a spline tooth. DETAILED DESCRIPTION

[0021] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0022] It should be noted that the illustrations provided in the following embodiments are only used to schematically illustrate the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0023] like Figure 1 As shown, an easily disassembled driving gear and its transmission shaft structure include a transmission shaft 5 and a driving gear 3, wherein the right end of the transmission shaft 5 is inserted into the accessory case gear, and the left end of the transmission shaft 5 is limited by an elastic retaining ring 6 and drives the driving gear 3 to rotate, wherein a limiting component and a disassembly guide mechanism are also provided, wherein the limiting component is provided at the right end of the transmission shaft 5, and the disassembly guide mechanism is provided below the limiting component.

[0024] The purpose of such design is to provide a driving gear and its transmission shaft structure that is easy to disassemble. By artificially manufacturing a disassembly chamfer, the elastic retaining ring shrinks during disassembly, and the transmission shaft is smoothly released from its installation position, thereby avoiding the driving gear and the transmission shaft being stuck during the disassembly process due to the original driving gear having no manufacturing chamfer or the elastic retaining ring being unable to shrink due to the accumulation of wear debris, thereby avoiding damage to the driving gear and the transmission shaft.

[0025] In this embodiment, the limiting component includes a leather cup 1, a leather cup frame 10 and a semicircular block 2. The semicircular block 2 is arranged on one side of the leather cup 1, and the leather cup 1 abuts against the left end of the transmission shaft 5 through the semicircular block 2. The leather cup frame 10 is disposed on the other side of the leather cup 1 .

[0026] Furthermore, the limiting component also includes a pressure plate 9 with a hole and a semicircular block 8 with a hole, and the pressure plate 9 with a hole and the semicircular block 8 with a hole are arranged on one side of the leather cup 1 and on the same side as the leather cup frame 10; The semicircular block 8 with holes abuts against the leather cup frame 10; The hole pressure plate 9 covers the semicircular block 8 with holes.

[0027] At the same time, a conical spring 7 is arranged between the perforated pressure plate 9 and the perforated semicircular block 8, and a wire retaining ring 4 is arranged at the right end of the transmission shaft 5.

[0028] The purpose of this design is to increase the connection tightness between the transmission shaft and the accessory case gear by providing components such as the leather cup, leather cup frame and semicircular block.

[0029] In this embodiment, Figure 4 As shown, the decomposition guide mechanism includes an arc-shaped bottom plate 11 and spline teeth 12, and the spline teeth 12 are arranged at the chamfered end of the arc-shaped bottom plate 11, the chamfered end of the arc-shaped bottom plate 11 faces inward, the flush circle abuts against the groove in the driving gear, and the arc-shaped bottom plate 11 has a total of 3 pieces, and the thickness from the root of the spline teeth 12 to the outer circle is 1mm, and the width is 6mm.

[0030] In actual use, Figure 2 In the area A shown in the figure, the circumferential turning process is performed along the center line of the driving gear, and the thickness from the tooth root to the outer circle after processing is 1mm; the turning part is cut along the direction perpendicular to the center line of the driving gear, and the cutting width is 6mm; the cut part is separated and cut along the tooth root to form 3 pieces of decomposed guide pieces, each piece has 4 spline teeth, and is placed Figure 3 In the C area, gun grease can be adhered to ensure the stable placement of the decomposition guide mechanism.

[0031] In this embodiment, a method for disassembling a driving gear and a transmission shaft thereof is also provided, which is implemented based on a driving gear and a transmission shaft structure that is easy to disassemble, and is characterized in that it includes the following steps: S1. Decompose the driving gear assembly according to the process to retain the transmission shaft 5, the circlip 6 and the driving gear 3; S2. The three decomposition guide mechanisms are evenly placed, wherein the chamfered end of the arc-shaped film 11 faces inward, and the flush circle of the arc-shaped film 11 abuts against the groove in the driving gear; S3. Place the driving gear assembly on the bracket, and use the bakelite end of a double-sided hammer to knock the end surface of the transmission shaft 5 to disassemble the lower transmission shaft 5.

[0032] In addition, the decomposition guide mechanism is obtained by processing the scrapped driving gear, and the processing method is to perform circumferential turning along the center line of the scrapped driving gear, and the thickness from the tooth root to the outer circle after processing is 1mm; Cut the turning part perpendicular to the center line of the driving gear, with a cutting width of 6mm; The cut parts are separated and cut along the tooth roots to form three arc-shaped bottom sheets 11 , each of which has four spline teeth 12 .

[0033] The purpose of such design is, on the one hand, to provide a driving gear and its transmission shaft structure that is easy to disassemble, and to make an artificial decomposition chamfer so that the elastic retaining ring shrinks during decomposition, and the transmission shaft smoothly disengages from its installation position, thereby avoiding the damage to the driving gear and the transmission shaft caused by the original driving gear without manufacturing chamfers or the elastic retaining ring being unable to shrink due to the accumulation of wear debris. During decomposition, the three decomposition pieces of the decomposition device are placed into the groove of the driving gear, and the transmission shaft is pressed to fix it, and then the end face of the transmission shaft is knocked by the bakelite end of the double-sided hammer, so that the lower transmission shaft can be smoothly decomposed. By using this decomposition device and method, the decomposition scrap rate of the driving gear and the transmission shaft can be reduced from about 10% to 0, greatly saving the repair cost. On the other hand, it breaks through the cognitive drawbacks of the original decomposition method. When the original driving gear decomposition chamfer fails to close the elastic retaining ring, another way is taken, and the decomposition chamfer is artificially constructed to achieve efficient and high-quality decomposition of the driving gear assembly, which not only ensures the decomposition quality, but also improves the decomposition efficiency, and greatly saves the cost of repair and replacement of enterprises.

[0034] like Figure 3 The area B shown is a disassembly chamfer. Hammering or tapping the disassembly chamfer during disassembly can shrink the retaining ring and thus remove it. However, as described in the background technology, oftentimes, wear debris is generated at the contact points between the driving gear, the transmission shaft, and the elastic retaining ring. Since air directly passes through the wear debris, rust mud will form when the engine works for a long time. The rust mud will cause the transmission shaft to get stuck or the shrinkage space of the elastic retaining ring to be limited, resulting in the inability to disassemble the transmission shaft from the driving gear or the disassembly being scrapped.

[0035] Therefore, in actual use, Figure 5 As shown, a decomposition guide structure is made in the left area A, and then placed in the right area C, so that it is constructed into a decomposition chamfer.

[0036] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An easily disassembled driving gear and its transmission shaft structure, comprising a transmission shaft (5) and a driving gear (3), wherein the right end of the transmission shaft (5) is inserted into the accessory case gear, and the left end of the transmission shaft (5) is limited by an elastic retaining ring (6) and drives the driving gear (3) to rotate. It is characterized in that A limiting component and a disassembly guide mechanism are also provided, wherein the limiting component is provided at the right end of the transmission shaft (5), and the disassembly guide mechanism is provided below the limiting component.

2. An easily disassembled driving gear and its transmission shaft structure according to claim 1, It is characterized in that The limiting component comprises a leather cup (1), a leather cup frame (10) and a semicircular block (2); the semicircular block (2) is arranged on one side of the leather cup (1), and the leather cup (1) abuts against the left end of the transmission shaft (5) through the semicircular block (2); The leather cup frame (10) is arranged on the other side of the leather cup (1).

3. An easily disassembled driving gear and its transmission shaft structure according to claim 2, It is characterized in that The limiting component further comprises a pressure plate with a hole (9) and a semicircular block with a hole (8), wherein the pressure plate with a hole (9) and the semicircular block with a hole (8) are arranged on one side of the leather cup (1) and on the same side as the leather cup frame (10); The semicircular block with holes (8) abuts against the leather cup frame (10); The hole pressure plate (9) covers the semicircular block (8) with holes.

4. The easily disassembled driving gear and its transmission shaft structure according to claim 3, It is characterized in that A conical spring (7) is also provided between the perforated pressure plate (9) and the perforated semicircular block (8).

5. An easily disassembled driving gear and its transmission shaft structure according to any one of claims 1 to 4, It is characterized in that A wire retaining ring (4) is provided at the right end of the transmission shaft (5).

6. The easily disassembled driving gear and its transmission shaft structure according to claim 5, It is characterized in that The decomposition guide mechanism comprises an arc-shaped bottom plate (11) and spline teeth (12), and the spline teeth (12) are arranged at the chamfered end of the arc-shaped bottom plate (11).

7. An easily disassembled driving gear and its transmission shaft structure according to claim 6, It is characterized in that The chamfered end of the arc-shaped bottom plate (11) faces inward, and the flush circle abuts against the groove in the driving gear, and there are three arc-shaped bottom plates (11) in total.

8. The easily disassembled driving gear and its transmission shaft structure according to claim 7, It is characterized in that The thickness of the spline teeth (12) from the tooth root to the outer circle is 1 mm, and the width is 6 mm.

9. A method for disassembling a driving gear and its transmission shaft, based on the easily disassembled driving gear and its transmission shaft structure as claimed in claim 8, It is characterized in that The following steps are involved: S1. Decompose the driving gear assembly according to the process to retain the transmission shaft (5), the elastic retaining ring (6) and the driving gear (3); S2. The three decomposition guide mechanisms are evenly distributed, wherein the chamfered end of the arc-shaped film (11) faces inward, and the flush circle of the arc-shaped film (11) abuts against the groove in the driving gear; S3. Place the driving gear assembly on the bracket and use the bakelite end of a double-sided hammer to knock the end surface of the transmission shaft (5) to disassemble the lower transmission shaft (5).

10. A method for disassembling a driving gear and a transmission shaft thereof according to claim 9, It is characterized in that The decomposition guide mechanism is obtained by processing the scrapped driving gear, and the processing method is to perform circumferential turning along the center line of the scrapped driving gear, and the thickness from the tooth root to the outer circle after processing is 1mm; Cut the turning part perpendicular to the center line of the driving gear, with a cutting width of 6mm; The cut parts are separated and cut along the tooth roots to form three arc-shaped bottom plates (11), each of which has four spline teeth (12).

Images