Transmission box device and aircraft engine having the same

Abstract

The present invention discloses a transmission box device and an aircraft engine having the same, comprising: a transmission box, a central gear, a first-layer transmission chain, a second-layer transmission chain, and a third-layer transmission chain. The power input end of the central gear is connected to the accessory transmission casing. The first-layer transmission chain includes a main fuel pump transmission chain, whose input end is connected to the central gear. The second-layer transmission chain includes an auxiliary fuel pump transmission chain, a fuel regulator transmission chain, a hydraulic pump transmission chain, and a transmission box oil pump transmission chain. The input ends of the auxiliary fuel pump transmission chain, the fuel regulator transmission chain, and the hydraulic pump transmission chain are respectively connected to the central gear, and the input end of the transmission box oil pump transmission chain is connected to the hydraulic pump transmission chain. The third-layer transmission chain includes a tachometer sensor transmission chain, whose input end is connected to the hydraulic pump transmission chain. The transmission box device of the present invention has a more compact transmission chain, a more ingenious spatial arrangement, higher transmission efficiency, more reliable operation, and also makes the entire transmission box device lighter and smaller in size.

Description

Technical Field

[0001] The present invention relates to the field of turboprop aircraft engines, and in particular to a transmission box device. In addition, the present invention also relates to an aircraft engine comprising the transmission box device. Background Art

[0002] The accessory transmission casing of a certain type of aircraft engine is the engine's air intake casing, and is also the casing for accessory transmission and installation. However, the modified engine requires the transmission and installation of many accessories, including the main fuel pump, auxiliary fuel pump, hydraulic pump, tachometer sensor, fuel regulator, transmission box oil pump, etc., a total of 6 engine / aircraft accessories. Therefore, it is difficult to bear the burden on the accessory casing, so a transmission box device is designed.

[0003] The existing transmission box device has a complex power transmission chain transmission path, a complex and non-compact structure inside the box, a large overall weight, and requires a large installation space. Summary of the Invention

[0004] The present invention provides a transmission box device and an aircraft engine having the same, so as to solve the technical problems of the existing transmission box device, such as the complex transmission path of the power transmission chain, the complex and non-compact structure inside the box, the large overall weight and the large installation space required.

[0005] The technical solution adopted in the present invention is as follows:

[0006] A transmission box device includes: a transmission box connected to an accessory transmission casing, and a central gear, a first-layer transmission chain, a second-layer transmission chain and a third-layer transmission chain arranged in the transmission box; the central gear is rotatably installed in the transmission box, and its power input end is connected to the transmission chain in the accessory transmission casing; the first-layer transmission chain includes a main fuel pump transmission chain, the input end of the main fuel pump transmission chain is connected to the central gear, and the output end is connected to the main fuel pump; the second-layer transmission chain includes an auxiliary fuel pump transmission chain, a fuel regulator transmission chain, a hydraulic pump transmission chain and a transmission box oil pump transmission chain, and the input ends of the auxiliary fuel pump transmission chain, the fuel regulator transmission chain and the hydraulic pump transmission chain are respectively connected to the central gear , its output end is respectively connected to the corresponding auxiliary fuel pump, fuel regulator and hydraulic pump, the input end of the transmission box oil pump transmission chain is connected to the hydraulic pump transmission chain, and its output end is connected to the transmission box oil pump; the third-layer transmission chain includes a tachometer sensor transmission chain, the input end of the tachometer sensor transmission chain is connected to the hydraulic pump transmission chain, and its output end is connected to the tachometer sensor; the first-layer transmission chain, the second-layer transmission chain and the third-layer transmission chain are arranged in layers along the axial space of the central gear, and the main fuel pump transmission chain, the auxiliary fuel pump transmission chain, the fuel regulator transmission chain, the hydraulic pump transmission chain, the transmission box oil pump transmission chain and the tachometer sensor transmission chain respectively output power along the axial direction of the central gear.

[0007] Furthermore, the transmission box body includes a transmission box shell and a transmission box cover that are arranged in conjunction with each other, and the transmission box shell is connected to the bottom of the accessory transmission case; the central gear includes a central gear shaft, and a central large gear and a central small gear that are axially arranged on the outer circle of the central gear shaft in sequence, and the two ends of the central gear shaft are respectively rotatably supported on the transmission box shell and the transmission box cover, and the central large gear is located above the central small gear and close to the transmission box shell; the main fuel pump, auxiliary fuel pump, fuel regulator, hydraulic pump and tachometer sensor are respectively connected to the outer surface of the transmission box cover, and the transmission box oil pump is connected to the transmission box shell.

[0008] Furthermore, the main fuel pump transmission chain includes a main fuel pump gear and an extended shaft of the main fuel pump; the main fuel pump gear includes a main fuel pump gear shaft and a main fuel pump gear plate fixedly arranged on the outer circle of the main fuel pump gear shaft. The main fuel pump gear shaft is arranged parallel to the central gear shaft, and its two ends are respectively rotatably supported on the transmission box housing and the transmission box cover. The main fuel pump gear plate is externally meshed with the central large gear; the extended shaft of the main fuel pump passes through the transmission box cover and is coaxially connected to the main fuel pump gear shaft.

[0009] Furthermore, the fuel regulator transmission chain is coaxially arranged with the central gear, and the output end is connected to the fuel regulator; the hydraulic pump transmission chain and the transmission box oil pump transmission chain are located on the first side of the central gear, and the output end of the hydraulic pump transmission chain is connected to the hydraulic pump, and the output end of the transmission box oil pump transmission chain is connected to the transmission box oil pump; the auxiliary fuel pump transmission chain is located on the second side of the central gear, and the output end is connected to the auxiliary fuel pump.

[0010] Furthermore, the fuel regulator transmission chain includes an extended shaft of the fuel regulator, the upper end of the extended shaft of the fuel regulator is coaxially connected to the central gear shaft, and the opposite lower end is connected to the fuel regulator; the auxiliary fuel pump transmission chain includes an auxiliary fuel pump gear, and an extended shaft of the auxiliary fuel pump, the auxiliary fuel pump gear includes an auxiliary fuel pump gear shaft, and an auxiliary fuel pump gear plate fixedly arranged on the outer circle of the auxiliary fuel pump gear shaft, the auxiliary fuel pump gear shaft is arranged parallel to the central gear shaft, and is rotatably supported on the transmission box cover, and the auxiliary fuel pump gear plate is externally meshed with the central pinion; the extended shaft of the auxiliary fuel pump passes through the transmission box cover and is coaxially connected to the auxiliary fuel pump gear shaft.

[0011] Furthermore, the hydraulic pump transmission chain includes a hydraulic pump gear and an extended shaft of the hydraulic pump; the hydraulic pump gear includes a hydraulic pump gear shaft, and a hydraulic pump large gear and a hydraulic pump small gear axially installed on the outer circle of the hydraulic pump gear shaft in sequence, the hydraulic pump gear shaft is arranged parallel to the central gear shaft, and the two ends are respectively rotatably supported on the transmission box housing and the transmission box cover, the hydraulic pump large gear is located above the hydraulic pump small gear, and close to the transmission box housing, and the hydraulic pump large gear is externally meshed with the central small gear; the extended shaft of the hydraulic pump passes through the transmission box cover and is coaxially connected to the hydraulic pump gear shaft.

[0012] Furthermore, the transmission chain of the transmission box oil pump includes an oil pump transmission gear of the transmission box oil pump, and the oil pump transmission gear includes an oil pump transmission gear shaft and an oil pump transmission gear plate installed on the outer circle of the oil pump transmission gear shaft; the oil pump transmission gear shaft is arranged in the transmission box oil pump and is parallel to the hydraulic pump gear shaft; the oil pump transmission gear plate is engaged with the outside of the hydraulic pump large gear.

[0013] Furthermore, an oil inlet hole connected to the accessory transmission casing is provided on the top of the transmission box housing, so that the lubricating oil in the accessory transmission casing can fall into the transmission box body; an oil flow path is also provided on the inner wall of the transmission box housing, and the oil flow path is connected to the accessory transmission casing, and the transmission box oil pump is connected to the oil flow path, so that the lubricating oil in the transmission box body can be pumped into the oil flow path under the action of the transmission box oil pump, and then returned to the accessory transmission casing through the oil flow path.

[0014] Furthermore, the tachometer sensor transmission chain includes an intermediate gear of a transmission box, a tachometer transmission shaft of the tachometer sensor, and a tachometer gear installed on the outer circle of the tachometer transmission shaft; the intermediate gear of the transmission box includes an intermediate gear shaft, and an intermediate gear fixedly installed on the outer circle of the intermediate gear shaft, the intermediate gear shaft is rotatably supported on the transmission box cover and is parallel to the hydraulic pump gear shaft, and the intermediate gear is externally meshed with the hydraulic pump pinion; the tachometer transmission shaft is installed on the tachometer sensor and is parallel to the intermediate gear shaft, and the tachometer gear is externally meshed with the intermediate gear.

[0015] According to another aspect of the present invention, an aircraft engine is provided, comprising a transmission box device as described above.

[0016] The present invention has the following beneficial effects:

[0017] The present invention designs a transmission box device, and designs three layers (first layer transmission chain, second layer transmission chain and third layer transmission chain) in its narrow inner cavity, with a total of 6 internal transmission chains (main fuel pump transmission chain, auxiliary fuel pump transmission chain, fuel regulator transmission chain, hydraulic pump transmission chain, transmission box oil pump transmission chain and tachometer sensor transmission chain), which drive a total of 6 accessories (main fuel pump, auxiliary fuel pump, hydraulic pump, tachometer sensor, transmission box oil pump, fuel regulator), which can not only realize the normal operation of the transmission box body and the accessory transmission system, but also can compactly install each accessory on the transmission box body, thereby ensuring the reliability of the transmission operation of the transmission box body; in the device of the present invention, since the first layer transmission chain, the second layer transmission chain and the third layer transmission chain are arranged along the axial space of the central gear, the transmission box body can be connected to the transmission box body by the transmission chain. The transmission box body is light in weight and smaller in size, which is only about one-third of the existing conventional transmission structure. The present invention has been implemented on a certain type of turboprop engine series. The results show that the transmission box body transmission device works reliably and has achieved the design purpose. It has the prospect of being promoted to a certain turboprop engine series and has good social benefits.

[0018] The aero-engine of the present invention can not only realize the normal operation of the transmission box body and the accessory transmission system, but also can compactly install 6 accessories on the transmission box body, thereby ensuring the reliability of the transmission operation of the transmission box body, and realizing transmission on three horizontal planes in the entire transmission chain space. The transmission chain is more compact, the spatial arrangement is more ingenious, the transmission efficiency is higher, and the operation is more reliable. The entire transmission box body device is also light in weight and smaller in size, which is only about one-third of the existing conventional transmission structure. The present invention has been implemented on a certain type of turboprop series engine. The results show that the transmission box body transmission device works reliably, achieves the design purpose, and has the prospect of being promoted to a certain turboprop series engine, with good social benefits.

[0019] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0021] Figure 11 is a schematic diagram of a top view of the transmission box device according to a preferred embodiment of the present invention;

[0022] Figure 2 yes Figure 1 AA-axis cross-sectional structural diagram;

[0023] Figure 3 yes Figure 1 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0024] Figure 4 yes Figure 1 Schematic diagram of the CC-direction cross-sectional structure.

[0025] Legend

[0026] 10. Transmission box body; 101. Lubricating oil flow path; 11. Transmission box housing; 12. Transmission box cover; 20. Central gear; 30. Main fuel pump transmission chain; 31. Main fuel pump gear; 40. Auxiliary fuel pump transmission chain; 41. Auxiliary fuel pump gear; 50. Fuel regulator transmission chain; 60. Hydraulic pump transmission chain; 61. Hydraulic pump gear; 70. Transmission box oil pump transmission chain; 71. Oil pump transmission gear; 72. Transmission box oil pump; 80. Tachometer sensor transmission chain; 81. Transmission box intermediate gear; 82. Tachometer sensor; 83. Tachometer drive shaft; 84. Tachometer gear. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0028] Reference Figure 1-Figure 4A preferred embodiment of the present invention provides a transmission case device comprising: a transmission case 10 connected to an accessory transmission housing; a central gear 20, a first-layer transmission chain, a second-layer transmission chain, and a third-layer transmission chain disposed within the transmission case 10. The central gear 20 is rotatably mounted within the transmission case 10, with its power input end connected to the transmission chain within the accessory transmission housing. The first-layer transmission chain comprises a main fuel pump transmission chain 30, the input end of which is connected to the central gear 20, and the output end of which is connected to the main fuel pump. The second-layer transmission chain comprises an auxiliary fuel pump transmission chain 40, a fuel regulator transmission chain 50, a hydraulic pump transmission chain 60, and a transmission case oil pump transmission chain 70. The input ends of the auxiliary fuel pump transmission chain 40, the fuel regulator transmission chain 50, and the hydraulic pump transmission chain 60 are respectively connected to the central gear 20, and their output ends are respectively connected to the corresponding auxiliary fuel pump, fuel regulator, and hydraulic pump. The transmission case oil pump transmission chain 70 has its input end connected to the hydraulic pump transmission chain 60, and its output end connected to the transmission case oil pump 72. The third-layer transmission chain includes a tachometer sensor transmission chain 80, the input end of which is connected to the hydraulic pump transmission chain 60, and the output end of which is connected to the tachometer sensor 82. The first, second, and third-layer transmission chains are sequentially arranged in layers along the axial direction of the central gear 20. The main fuel pump transmission chain 30, auxiliary fuel pump transmission chain 40, fuel regulator transmission chain 50, hydraulic pump transmission chain 60, transmission box oil pump transmission chain 70, and tachometer sensor transmission chain 80 each output power along the axial direction of the central gear 20.

[0029] The present invention designs a transmission box body device, and designs three layers (first layer transmission chain, second layer transmission chain and third layer transmission chain) in its narrow inner cavity, with a total of 6 internal transmission chains (main fuel pump transmission chain 30, auxiliary fuel pump transmission chain 40, fuel regulator transmission chain 50, hydraulic pump transmission chain 60, transmission box oil pump transmission chain 70 and tachometer sensor transmission chain 80), which drive a total of 6 accessories (main fuel pump, auxiliary fuel pump, hydraulic pump, tachometer sensor 82, transmission box oil pump 72, fuel regulator), which can not only realize the normal operation of the transmission box body and the accessory transmission system, but also can compactly install the 6 accessories on the transmission box body 10, thereby ensuring the reliability of the transmission operation of the transmission box body; in the device of the present invention, since the first layer transmission chain, the second layer transmission chain and the third layer transmission chain are along the central gear 20 The axial space is arranged in layers in sequence, and the main fuel pump transmission chain 30, the auxiliary fuel pump transmission chain 40, the fuel regulator transmission chain 50, the hydraulic pump transmission chain 60, the transmission box oil pump transmission chain 70 and the tachometer sensor transmission chain 80 respectively output power along the axial direction of the central gear 20. This structural layout not only enables the entire transmission chain space to realize transmission on three horizontal planes, but also makes the transmission chain more compact, the space arrangement more ingenious, the transmission efficiency higher, and the operation more reliable. It also makes the entire transmission box body device light in weight and smaller in size, which is only about one-third of the existing conventional transmission structure. The present invention has been implemented on a certain type of turboprop series engine. The results show that the transmission box body transmission device works reliably, achieves the design purpose, and has the application prospect of being promoted to a certain turboprop series engine, with good social benefits.

[0030] Alternatively, as Figure 2-4As shown, the transmission housing 10 comprises a mating transmission housing 11 and a transmission cover 12. The transmission housing 11 is connected to the bottom of the accessory transmission case. In this alternative embodiment, the transmission housing assembly is mounted outside the engine's accessory transmission case via the transmission housing 11. It serves as an independent transmission branch within the engine, with independent oil supply and return systems. This provides high transmission power, allowing for independent replacement of related gears, lubricating oil accessories, and even the entire transmission housing assembly in the field, making it easier to use and maintain. The central gear 20 comprises a central gear shaft, a central gear and a central pinion, axially arranged on the outer circumference of the central gear shaft. The central gear shaft is rotatably supported on the transmission housing 11 and the transmission cover 12, respectively. The central gear is located above the central pinion and adjacent to the transmission housing 11. The main fuel pump, auxiliary fuel pump, fuel regulator, hydraulic pump, and tachometer sensor 82 are connected to the outer surface of the transmission cover 12, respectively. The transmission oil pump 72 is connected to the transmission housing 11. In this optional solution, the central gear 20 is a double gear, so that the speed of the output shaft can be changed through the double gear, so that the entire transmission box device has multiple speeds, and the entire transmission chain space can realize transmission on three horizontal planes. The transmission chain is more compact, the spatial layout is more ingenious, the transmission efficiency is higher, the operation is more reliable, and the entire transmission box device is light in weight and smaller in size, which is only about one-third of the existing conventional accessory transmission structure.

[0031] In this option, if Figure 1 As shown, the transmission box housing 11 and the transmission box cover 12 are both aluminum alloy castings, and the transmission box housing 11 and the transmission box cover 12 are connected to form a box body with two positioning pins and 19 screws. The inner cavity has convex edges of each accessory transmission mechanism and its bearing seat. The entire transmission box body 10 is fixed to the accessory transmission casing through 10 holes. The inner wall of the positioning convex edge is also drilled with 4 holes, so that the lubricating oil in the accessory transmission casing leaks into the transmission box body 10 from this hole for lubricating the gears and bearings in the transmission box body 10.

[0032] Alternatively, as Figure 2 and Figure 3As shown, the main fuel pump transmission chain 30 includes a main fuel pump gear 31 and an external shaft extending from the main fuel pump. The main fuel pump gear 31 comprises a main fuel pump gear shaft and a main fuel pump gear plate fixedly mounted on the outer circumference of the main fuel pump gear shaft. The main fuel pump gear shaft is arranged parallel to the central gear shaft, with its ends rotatably supported on the transmission case housing 11 and the transmission case cover 12, respectively. The main fuel pump gear plate meshes with the outer portion of the central gear. The external shaft extending from the main fuel pump passes through the transmission case cover 12 and is coaxially connected to the main fuel pump gear shaft. During operation, the main fuel pump gear plate meshes with the outer portion of the central gear, thereby driving the main fuel pump gear 31 via the central gear 20. The internal splines of the main fuel pump gear 31 connect to the external shaft extending from the main fuel pump, thereby driving the main fuel pump. In this optional solution, since the main fuel pump gear shaft is arranged parallel to the central gear shaft, and the main fuel pump gear plate is externally meshed with the central large gear, this structural layout not only makes the structural layout compact, but also shortens the power transmission path in the transmission chain, increases the power transmission efficiency, and makes the power transmission more reliable.

[0033] Alternatively, as Figure 2 As shown, the fuel regulator drive chain 50 is coaxially arranged with the central gear 20, with its output end connected to the fuel regulator. A hydraulic pump drive chain 60 and a transmission box oil pump drive chain 70 are located on a first side of the central gear 20, with the output end of the hydraulic pump drive chain 60 connected to the hydraulic pump, and the output end of the transmission box oil pump drive chain 70 connected to the transmission box oil pump 72. The auxiliary fuel pump drive chain 40 is located on a second side of the central gear 20, with its output end connected to the auxiliary fuel pump. In this optional solution, since the fuel regulator transmission chain 50 is coaxially arranged with the central gear 20, the hydraulic pump transmission chain 60 and the transmission box oil pump transmission chain 70 are located on the first side of the central gear 20, and the auxiliary fuel pump transmission chain 40 is located on the second side of the central gear 20, this structural layout not only makes the overall structural layout compact and reasonable, but also the four transmission chains (auxiliary fuel pump transmission chain 40, fuel regulator transmission chain 50, hydraulic pump transmission chain 60 and transmission box oil pump transmission chain 70) are transmitted on the same horizontal plane, and the power transmission path in the transmission chain is short, the force transmission efficiency is high, and the force transmission is more reliable.

[0034] In this option, if Figure 2 As shown, the fuel regulator transmission chain 50 includes an extended shaft for the fuel regulator. The upper end of the extended shaft is coaxially connected to the central gear shaft, and the lower end is connected to the fuel regulator. During operation, the extended shaft engages the internal spline of the central pinion of the central gear 20, thereby driving the fuel regulator. In this alternative embodiment, the upper end of the extended shaft for the fuel regulator is coaxially connected to the central gear shaft. This structural layout not only makes the structure compact, but also shortens the power transmission path in the transmission chain, improves power transmission efficiency, and enhances power transmission reliability.

[0035] In this option, if Figure 2As shown, the auxiliary fuel pump transmission chain 40 includes an auxiliary fuel pump gear 41 and an externally extending shaft of the auxiliary fuel pump. The auxiliary fuel pump gear 41 includes an auxiliary fuel pump gear shaft and an auxiliary fuel pump gear plate fixedly mounted on the outer circumference of the auxiliary fuel pump gear shaft. The auxiliary fuel pump gear shaft is arranged parallel to the central gear shaft and is rotatably supported on the transmission case cover 12. The auxiliary fuel pump gear plate meshes with the external center pinion. The externally extending shaft of the auxiliary fuel pump passes through the transmission case cover 12 and is coaxially connected to the auxiliary fuel pump gear shaft. During operation, the auxiliary fuel pump gear plate meshes with the external center pinion, and the central gear 20 drives the auxiliary fuel pump gear 41 to rotate. The auxiliary fuel pump gear 41 is then connected to the externally extending shaft of the auxiliary fuel pump via an internal spline, thereby driving the auxiliary fuel pump. In this optional solution, since the auxiliary fuel pump gear shaft is arranged parallel to the central gear shaft, the auxiliary fuel pump gear plate is externally meshed with the central pinion, and the external extension shaft of the auxiliary fuel pump is coaxially connected to the auxiliary fuel pump gear shaft, this structural layout not only makes the structural layout compact, but also shortens the power transmission path in the transmission chain, has high power transmission efficiency, and is more reliable in power transmission.

[0036] In this option, if Figure 2 As shown, the hydraulic pump transmission chain 60 includes a hydraulic pump gear 61 and an extended shaft of the hydraulic pump. The hydraulic pump gear 61 comprises a hydraulic pump gear shaft, a hydraulic pump gearwheel, and a hydraulic pump pinion gear, which are axially mounted on the outer circumference of the hydraulic pump gear shaft. The hydraulic pump gear shaft is arranged parallel to the central gear shaft, and its ends are rotatably supported on the transmission box housing 11 and the transmission box cover 12, respectively. The hydraulic pump gearwheel is located above the hydraulic pump pinion gear and adjacent to the transmission box housing 11, and the hydraulic pump gearwheel and the central pinion gear are externally meshed. The extended shaft of the hydraulic pump passes through the transmission box cover 12 and is coaxially connected to the hydraulic pump gear shaft. During operation, the hydraulic pump gearwheel and the central pinion gear are externally meshed, driving the hydraulic pump gear 61 through the central gear 20. The hydraulic pump gear 61 is then connected to the extended shaft of the hydraulic pump via the rectangular internal spline on the hydraulic pump pinion gear, thereby driving the hydraulic pump. In this optional solution, since the hydraulic pump gear shaft is arranged parallel to the central gear shaft, and the hydraulic pump large gear is externally meshed with the central small gear, and the hydraulic pump's extended shaft is coaxially connected to the hydraulic pump gear shaft, this structural layout not only makes the structural layout compact, but also shortens the power transmission path in the transmission chain, increases the force transmission efficiency, and makes the force transmission more reliable.

[0037] In this optional solution, the hydraulic pump gear 61 is a double gear, and the speed of the output shaft can be changed by the double gear, so that the entire transmission box device has multiple speeds, and the entire transmission chain space can realize transmission on three horizontal planes. The transmission chain is more compact, the spatial layout is more ingenious, the transmission efficiency is higher, the operation is more reliable, and the entire transmission box device is light in weight and smaller in size, which is only about one-third of the conventional accessory transmission structure.

[0038] In this option, if Figure 2 As shown, the transmission box oil pump transmission chain 70 includes an oil pump transmission gear 71 for the transmission box oil pump 72. The oil pump transmission gear 71 includes an oil pump transmission gear shaft and an oil pump transmission gear plate mounted on the outer circumference of the oil pump transmission gear shaft. The oil pump transmission gear shaft is located within the transmission box oil pump 72 and is parallel to the hydraulic pump gear shaft. The oil pump transmission gear plate meshes with the outer gear of the hydraulic pump. During operation, the oil pump transmission gear 71 in the transmission box oil pump 72 meshes with the hydraulic pump gear of the hydraulic pump gear 61. This, in turn, drives the oil pump transmission gear 71 through the hydraulic pump gear 61, which in turn drives the transmission box oil pump 72. In this alternative solution, because the oil pump transmission gear shaft is parallel to the hydraulic pump gear shaft and the oil pump transmission gear plate meshes with the outer gear of the hydraulic pump, this structural layout not only makes the structure compact, but also shortens the power transmission path in the transmission chain, improves power transmission efficiency, and enhances power transmission reliability.

[0039] Alternatively, as Figure 2 As shown, the top of the transmission case housing 11 is also provided with an oil inlet hole that communicates with the accessory transmission case, allowing the lubricating oil in the accessory transmission case to fall into the transmission case body 10. An oil flow path 101 is also provided on the inner wall of the transmission case housing 11. The oil flow path 101 communicates with the accessory transmission case, and the transmission case oil pump 72 is connected to the oil flow path 101. Under the action of the transmission case oil pump 72, the lubricating oil in the transmission case body 10 is pumped into the oil flow path 101, and then returned to the accessory transmission case through the oil flow path 101.

[0040] Alternatively, as Figure 2 and Figure 4 As shown, the tachometer sensor transmission chain 80 includes a transmission box intermediate gear 81, a tachometer drive shaft 83 for a tachometer sensor 82, and a tachometer gear 84 mounted on the outer circumference of the tachometer drive shaft 83. The transmission box intermediate gear 81 includes an intermediate gear shaft and an intermediate gear fixedly mounted on the outer circumference of the intermediate gear shaft. The intermediate gear shaft is rotatably supported on the transmission box cover 12 and parallel to the hydraulic pump gear shaft. The intermediate gear meshes with the external pinion of the hydraulic pump. The tachometer drive shaft 83 is mounted on the tachometer sensor 82 and parallel to the intermediate gear shaft. The tachometer gear 84 meshes with the external pinion. During operation, the hydraulic pump pinion of the hydraulic pump gear 61 drives the transmission box intermediate gear 81, which in turn drives the tachometer gear 84. The tachometer gear 84's half-moon key connects to the tachometer drive shaft 83, thereby driving the tachometer sensor 82. In this optional solution, since the intermediate gear shaft is parallel to the hydraulic pump gear shaft, and the intermediate gear is externally meshed with the hydraulic pump pinion, and the tachometer gear 84 is externally meshed with the intermediate gear, this structural layout not only makes the structural layout compact, but also shortens the power transmission path in the transmission chain, increases the force transmission efficiency, and makes the force transmission more reliable.

[0041] Reference Figure 1 and Figure 2The preferred embodiment of the present invention further provides an aircraft engine, including a transmission box device as described above. Therefore, the aircraft engine of the present invention can not only realize the normal operation of the transmission box and the accessory transmission system, but also can compactly install 6 accessories on the transmission box 10, ensuring the reliability of the transmission operation of the transmission box, and realize the transmission on three horizontal planes in the entire transmission chain space. The transmission chain is more compact, the spatial arrangement is more ingenious, the transmission efficiency is higher, the operation is more reliable, and the entire transmission box device is light in weight and smaller in size, which is only about one-third of the existing conventional transmission structure. The present invention has been implemented on a certain type of turboprop series engine. The results show that the transmission box transmission device works reliably, achieves the design purpose, and has the prospect of being promoted to a certain turboprop series engine, with good social benefits.

[0042] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A transmission box device, characterized in that: include: A transmission box body (10) connected to the accessory transmission casing, and a central gear (20), a first-layer transmission chain, a second-layer transmission chain, and a third-layer transmission chain arranged in the transmission box body (10); The central gear (20) is rotatably mounted in the transmission box body (10), and its power input end is connected to the transmission chain in the accessory transmission casing; The first layer of the transmission chain includes a main fuel pump transmission chain (30), the input end of the main fuel pump transmission chain (30) is connected to the central gear (20), and the output end is connected to the main fuel pump; The second layer transmission chain includes an auxiliary fuel pump transmission chain (40), a fuel regulator transmission chain (50), a hydraulic pump transmission chain (60) and a transmission box oil pump transmission chain (70), wherein the input ends of the auxiliary fuel pump transmission chain (40), the fuel regulator transmission chain (50) and the hydraulic pump transmission chain (60) are respectively connected to the central gear (20), and the output ends thereof are respectively connected to the corresponding auxiliary fuel pump, fuel regulator and hydraulic pump, and the input end of the transmission box oil pump transmission chain (70) is connected to the hydraulic pump transmission chain (60), and the output end thereof is connected to the transmission box oil pump (72); The third transmission chain includes a tachometer sensor transmission chain (80), the input end of the tachometer sensor transmission chain (80) is connected to the hydraulic pump transmission chain (60), and the output end thereof is connected to the tachometer sensor (82); The first layer transmission chain, the second layer transmission chain and the third layer transmission chain are sequentially arranged in layers along the axial space of the central gear (20), and the main fuel pump transmission chain (30), the auxiliary fuel pump transmission chain (40), the fuel regulator transmission chain (50), the hydraulic pump transmission chain (60), the transmission box oil pump transmission chain (70) and the tachometer sensor transmission chain (80) respectively output power along the axial direction of the central gear (20).

2. The transmission box device according to claim 1, characterized in that: The transmission box body (10) comprises a transmission box shell (11) and a transmission box cover (12) which are arranged in a coordinated manner, and the transmission box shell (11) is connected to the bottom of the accessory transmission casing; The central gear (20) includes a central gear shaft, and a central large gear and a central small gear sequentially arranged on the outer circle of the central gear shaft along the axial direction. The two ends of the central gear shaft are rotatably supported on the transmission box housing (11) and the transmission box cover (12), respectively. The central large gear is located above the central small gear and close to the transmission box housing (11). The main fuel pump, the auxiliary fuel pump, the fuel regulator, the hydraulic pump and the tachometer sensor (82) are respectively connected to the outer surface of the transmission box cover (12), and the transmission box oil pump (72) is connected to the transmission box housing (11).

3. The transmission box device according to claim 2, characterized in that: The main fuel pump transmission chain (30) includes a main fuel pump gear (31) and an outwardly extending shaft of the main fuel pump; The main fuel pump gear (31) includes a main fuel pump gear shaft and a main fuel pump gear plate fixedly arranged on the outer circle of the main fuel pump gear shaft. The main fuel pump gear shaft is arranged parallel to the central gear shaft, and its two ends are rotatably supported on the transmission box housing (11) and the transmission box cover (12). The main fuel pump gear plate is meshed with the outer surface of the central large gear. The outward extension shaft of the main fuel pump passes through the transmission box cover (12) and is coaxially connected to the main fuel pump gear shaft.

4. The transmission box device according to claim 2, characterized in that: The fuel regulator transmission chain (50) is coaxially arranged with the central gear (20), and the output end is connected to the fuel regulator; The hydraulic pump transmission chain (60) and the transmission box oil pump transmission chain (70) are located on the first side of the central gear (20), and the output end of the hydraulic pump transmission chain (60) is connected to the hydraulic pump, and the output end of the transmission box oil pump transmission chain (70) is connected to the transmission box oil pump (72); The auxiliary fuel pump transmission chain (40) is located on the second side of the central gear (20), and the output end is connected to the auxiliary fuel pump.

5. The transmission box device according to claim 4, characterized in that: The fuel regulator transmission chain (50) includes an outward-extending shaft of the fuel regulator, wherein the upper end of the outward-extending shaft of the fuel regulator is coaxially connected to the central gear shaft, and the opposite lower end thereof is connected to the fuel regulator; The auxiliary fuel pump transmission chain (40) includes an auxiliary fuel pump gear (41) and an external extension shaft of the auxiliary fuel pump. The auxiliary fuel pump gear (41) includes an auxiliary fuel pump gear shaft and an auxiliary fuel pump gear plate fixedly arranged on the outer circle of the auxiliary fuel pump gear shaft. The auxiliary fuel pump gear shaft is arranged parallel to the central gear shaft and is rotatably supported on the transmission box cover (12). The auxiliary fuel pump gear plate is externally meshed with the central pinion. The outward extension shaft of the auxiliary fuel pump passes through a transmission box cover (12) and is coaxially connected to the auxiliary fuel pump gear shaft.

6. The transmission box device according to claim 4, characterized in that: The hydraulic pump transmission chain (60) includes a hydraulic pump gear (61) and an outwardly extending shaft of the hydraulic pump; The hydraulic pump gear (61) includes a hydraulic pump gear shaft, and a hydraulic pump large gear and a hydraulic pump small gear sequentially mounted on the outer circle of the hydraulic pump gear shaft in the axial direction. The hydraulic pump gear shaft is arranged in parallel with the central gear shaft, and both ends are rotatably supported on the transmission box housing (11) and the transmission box cover (12). The hydraulic pump large gear is located above the hydraulic pump small gear and close to the transmission box housing (11), and the hydraulic pump large gear is externally meshed with the central small gear. The outward extension shaft of the hydraulic pump passes through a transmission box cover (12) and is coaxially connected to a gear shaft of the hydraulic pump.

7. The transmission box device according to claim 6, characterized in that: The transmission box oil pump transmission chain (70) includes an oil pump transmission gear (71) of the transmission box oil pump (72), and the oil pump transmission gear (71) includes an oil pump transmission gear shaft and an oil pump transmission gear plate mounted on the outer circle of the oil pump transmission gear shaft; The oil pump transmission gear shaft is arranged in the transmission box oil pump (72) and is parallel to the hydraulic pump gear shaft; The oil pump transmission gear plate is externally meshed with the large gear of the hydraulic pump.

8. The transmission box device according to claim 6, characterized in that: The top of the transmission box housing (11) is also provided with an oil inlet hole connected to the accessory transmission casing, so that the lubricating oil in the accessory transmission casing can fall into the transmission box body (10); An oil flow path (101) is also provided on the inner wall of the transmission box housing (11). The oil flow path (101) is connected to the accessory transmission casing, and the transmission box oil pump (72) is connected to the oil flow path (101). Under the action of the transmission box oil pump (72), the oil in the transmission box body (10) is pumped into the oil flow path (101), and then returned to the accessory transmission casing through the oil flow path (101).

9. The transmission box device according to claim 6, characterized in that: The tachometer sensor transmission chain (80) includes a transmission box intermediate gear (81), a tachometer transmission shaft (83) of a tachometer sensor (82), and a tachometer gear (84) mounted on the outer circle of the tachometer transmission shaft (83); The transmission box intermediate gear (81) includes an intermediate gear shaft and an intermediate gear fixedly mounted on the outer circle of the intermediate gear shaft. The intermediate gear shaft is rotatably supported on the transmission box cover (12) and is parallel to the hydraulic pump gear shaft. The intermediate gear is externally meshed with the hydraulic pump pinion gear. The tachometer transmission shaft (83) is mounted on the tachometer sensor (82) and is parallel to the intermediate gear shaft, and the tachometer gear (84) is externally meshed with the intermediate gear.

10. An aircraft engine, characterized in that: The invention comprises a transmission box body device as described in any one of claims 1 to 9.

Images