Helicopter ratchet system

Abstract

The invention provides a helicopter ratchet system which comprises a main rotor system, a transmission system, a tail rotor system and a ratchet mechanism, the transmission system is connected with the tail rotor system, the ratchet mechanism comprises a ratchet assembly, the ratchet assembly comprises a ratchet shaft sleeve, the ratchet shaft sleeve is connected with the transmission system, and a circle of ratchet groove with a barb-shaped cross section is formed in the inner wall of the ratchet shaft sleeve; the opening of the ratchet groove faces the rotating direction of the ratchet shaft sleeve; the pawl assembly comprises a pawl, an elastic piece and a pawl shaft sleeve, the pawl shaft sleeve is connected with the main rotor system, one end of the elastic piece is connected with the pawl shaft sleeve in an embedded mode, the other end of the elastic piece is connected with the pawl in an embedded mode, the first end of the pawl abuts against the pawl shaft sleeve, and the second end of the pawl abuts against the ratchet wheel groove under the elastic force effect of the elastic piece. According to the method, the falling speed can be slowed down after the engine of the helicopter loses power due to failure, the troubleshooting time is prolonged, and the troubleshooting difficulty can be reduced after the tail rotor system rotates due to failure, so that the safety of the helicopter is improved.

Description

Technical Field

[0001] The present application relates to the technical field of helicopters, and in particular to a helicopter ratchet system. Background Art

[0002] After a long period of development, the design of helicopters has gradually matured. Helicopters mainly include: body structure, main rotor system, tail rotor system, transmission system and power system. As a complex aircraft, helicopters face some safety hazards during use. For example, helicopters will quickly lose power after engine failure; and will spin after tail rotor failure. The changes in the behavior of helicopters under these two emergencies make them a high-risk vehicle, making the probability of survival of personnel very low after a failure. Summary of the invention

[0003] The embodiment of the present application provides a helicopter ratchet system to solve the safety problem of the helicopter losing power quickly after an engine failure and spinning after a tail rotor failure. The technical solution is as follows:

[0004] The embodiment of the present application provides a helicopter ratchet system, including a main rotor system, a transmission system, a tail rotor system and a ratchet mechanism, wherein the ratchet mechanism connects the main rotor system and the transmission system, the transmission system is connected to the tail rotor system, and the ratchet mechanism includes:

[0005] A ratchet assembly, the ratchet assembly comprising a ratchet sleeve, the ratchet sleeve being connected to the transmission system, the inner wall of the ratchet sleeve being provided with a circle of ratchet grooves having a barbed cross section, the opening of the ratchet grooves being oriented in the rotation direction of the ratchet sleeve;

[0006] A pawl assembly, the pawl assembly includes a pawl, an elastic member and a pawl sleeve, the pawl sleeve is connected to the main rotor system, the ratchet sleeve is sleeved on the pawl sleeve, the pawl is located between the pawl sleeve and the ratchet sleeve, one end of the elastic member is embedded in the pawl sleeve, the other end of the elastic member is embedded in the pawl, the first end of the pawl is abutted against the pawl sleeve, and the second end of the pawl is abutted against the ratchet groove under the elastic force of the elastic member.

[0007] In one embodiment, a first embedding groove is provided on the pawl sleeve, and a second embedding groove is provided on the pawl, wherein the second embedding groove extends from the first end portion of the pawl to the second end portion of the pawl, one end of the elastic member is embedded in the first embedding groove, and the other end of the elastic member is embedded in the second embedding groove.

[0008] In one embodiment, the elastic member is a V-shaped spring sheet, and the cross-section of the pawl is in the shape of a whistle.

[0009] In one embodiment, a conformal groove matched with the first end of the pawl is formed on the outer circumferential surface of the pawl sleeve, and the first end of the pawl is located in the conformal groove, and the first end of the pawl can rotate in the conformal groove.

[0010] In one embodiment, the ratchet assembly also includes a ratchet shaft cover, a sealing ring and a fastener, the ratchet shaft cover is sleeved on the pawl shaft sleeve, a sealing groove is provided on the lower surface of the ratchet shaft cover, the sealing ring is located in the sealing groove, and the ratchet shaft cover is sealed and connected to the upper surface of the ratchet shaft sleeve through the sealing ring; a bolt through hole is provided on the ratchet shaft cover, and a corresponding bolt threaded hole is provided on the ratchet shaft sleeve, and one end of the fastener passes through the bolt through hole on the ratchet shaft cover and is threadedly connected to the corresponding bolt threaded hole on the ratchet shaft sleeve.

[0011] In one embodiment, the ratchet shaft cover is provided with an oil filling hole and an exhaust hole which pass through the ratchet shaft cover from top to bottom, the oil filling hole and the exhaust hole are located in the inner circle of the sealing groove, and the oil filling hole and the exhaust hole are located between the inner wall of the ratchet shaft sleeve and the inner wall of the pawl shaft sleeve.

[0012] In one embodiment, the ratchet mechanism also includes a main rotor shaft and a transmission shaft, one end of the main rotor shaft is detachably connected to the ratchet sleeve, and the other end of the main rotor shaft is connected to the main rotor system; one end of the transmission shaft is detachably connected to the ratchet sleeve, and the other end of the transmission shaft is connected to the transmission system.

[0013] In one embodiment, a first groove is provided at one end of the main rotor shaft, and a first convex portion is provided inside the pawl sleeve, and the first convex portion matches the first groove.

[0014] In one embodiment, a second groove is provided at one end of the transmission main shaft, and a second convex portion is provided on the ratchet shaft sleeve, and the second convex portion matches the second groove.

[0015] In one embodiment, a first top screw and a first top screw threaded hole are provided on the pawl sleeve, one end of the main rotor main shaft is inserted into the pawl sleeve, and one end of the first top screw passes through the first top screw threaded hole and abuts against the main rotor main shaft; a second top screw and a second top screw threaded hole are provided on the ratchet sleeve, one end of the transmission main shaft is inserted into the ratchet sleeve, and one end of the second top screw passes through the second top screw threaded hole and abuts against the transmission main shaft.

[0016] The advantages or beneficial effects of the above technical solution include at least:

[0017] The helicopter ratchet system of the embodiment of the present application includes a main rotor system, a transmission system, a tail rotor system and a ratchet mechanism, and the ratchet mechanism includes a ratchet assembly and a pawl assembly. In the normal start-up mode of the helicopter, the transmission system drives the ratchet sleeve to rotate, and the ratchet sleeve drives the ratchet sleeve to rotate through the pawl, thereby driving the main rotor system to rotate, and the power transmission of the transmission system to the main rotor system is completed through the ratchet mechanism. After the helicopter engine fails and loses power, the rotation speed of the transmission system is lower than that of the main rotor system. Due to the setting of the elastic member and the ratchet groove, the pawl will continuously slide out of the current ratchet groove and slide into the next ratchet groove, so that the ratchet sleeve and the ratchet sleeve slide relative to each other, and the ratchet mechanism disconnects the power transmission between the transmission system and the main rotor system, and the main rotor system is in a free rotation state, which slows down the falling speed of the helicopter and increases the troubleshooting time. After the tail rotor system of the helicopter spins due to a fault, the engine power is continuously reduced artificially to make the rotation speed of the transmission system lower than that of the main rotor system, and the anti-torque between the main rotor system and the transmission system is disconnected by the ratchet mechanism, so that the helicopter is in a state without anti-torque, thereby reducing the difficulty of troubleshooting. The embodiment of the present application can slow down the falling speed and increase the troubleshooting time after the helicopter engine loses power due to a fault through the setting of the ratchet mechanism, and after the tail rotor system of the helicopter spins due to a fault, the difficulty of troubleshooting can be reduced, thereby improving the safety of the helicopter.

[0018] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present application will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0020] Figure 1 It is a structural schematic diagram of the helicopter ratchet system;

[0021] Figure 2 is a schematic diagram of a ratchet mechanism;

[0022] Figure 3 This is the exploded diagram of the ratchet mechanism;

[0023] Figure 4 is a schematic structural diagram of a pawl assembly;

[0024] Figure 5 is a schematic diagram of the structure of the ratchet assembly;

[0025] Figure 6 is a transverse cross-sectional view of the ratchet mechanism;

[0026] Figure 7 is a longitudinal section view of the ratchet mechanism;

[0027] Figure 8 It is a schematic diagram of the combination of the ratchet shaft cover and the pawl assembly;

[0028] Fig. 9 It is a schematic diagram of the structure of the ratchet shaft cover and the sealing ring;

[0029] Fig.10 It is a cross-sectional view after the ratchet shaft sleeve is connected to the transmission main shaft;

[0030] Description of reference numerals:

[0031] 1. Main rotor system; 2. Transmission system; 3. Tail rotor system; 4. Ratchet mechanism; 41. Ratchet assembly; 42. Ratchet pawl assembly; 411. Ratchet shaft sleeve; 412. Ratchet groove; 421. Ratchet pawl; 4211. First end; 4212. Second end; 422. Elastic member; 423. Ratchet shaft sleeve; 424. First embedded groove; 425. Second embedded groove; 426. Conformal groove; 413. Ratchet shaft cover; 4131. Bolt through hole; 414. Sealing ring; 419. Sealing groove; 415. Screw Bolt threaded hole; 416, fastening bolt; 417, oil filling hole; 418, exhaust hole; 43, main rotor shaft; 44, transmission main shaft; 4231, first cylinder; 4232, second cylinder; 431, first groove; 4233, first convex portion; 4234, first top screw; 4235, first top screw threaded hole; 4111, third cylinder; 4112, fourth cylinder; 441, second groove; 4114, second convex portion; 4115, second top screw; 4116, second top screw threaded hole. DETAILED DESCRIPTION

[0032] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present application. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0033] like Figures 1 to 4As shown, the embodiment of the present application provides a helicopter ratchet system, including a main rotor system 1, a transmission system 2, a tail rotor system 3 and a ratchet mechanism 4, wherein the ratchet mechanism 4 connects the main rotor system 1 with the transmission system 2, and the transmission system 2 is connected to the tail rotor system 3. The ratchet mechanism 4 includes a ratchet assembly 41 and a pawl assembly 42, wherein the ratchet assembly 41 includes a ratchet sleeve 411, and the ratchet sleeve 411 is connected to the transmission system 2. A circle of ratchet grooves 412 with a barbed cross section are provided on the inner wall of the ratchet sleeve 411, and the opening of the ratchet groove 412 faces the rotation direction of the ratchet sleeve 411. The pawl assembly 42 includes a pawl 421, an elastic member 422 and a pawl sleeve 423, and the pawl sleeve 423 is connected to the main rotor system 1. The ratchet sleeve 411 is sleeved on the pawl sleeve 423, and the pawl 421 is located between the pawl sleeve 423 and the ratchet sleeve 411. One end of the elastic member 422 is embedded in the pawl sleeve 423 , and the other end of the elastic member 422 is embedded in the pawl 421 . The first end 4211 of the pawl 421 abuts against the pawl sleeve 423 , and the second end 4212 of the pawl 421 abuts against the ratchet groove 412 under the elastic force of the elastic member 422 .

[0034] In the helicopter ratchet system of the embodiment of the present application, when the helicopter is in normal start-up mode, the transmission system 2 drives the ratchet sleeve 411 to rotate, and the ratchet sleeve 411 drives the ratchet sleeve 423 to rotate through the ratchet 421, thereby driving the main rotor system 1 to rotate, and the transmission system 2 completes the power transmission to the main rotor system 1 through the ratchet mechanism 4. After the helicopter engine fails and loses power, the rotation speed of the transmission system 2 is lower than that of the main rotor system 1. Due to the setting of the elastic member 422 and the ratchet groove 412, the ratchet 421 will continuously slide out of the current ratchet groove 412 and slide into the next ratchet groove 412, so that the ratchet sleeve 423 and the ratchet sleeve 411 slide relative to each other, and the ratchet mechanism 4 disconnects the power transmission between the transmission system 2 and the main rotor system 1, and the main rotor system 1 is in a free rotation state, which slows down the falling speed of the helicopter and increases the troubleshooting time. After the tail rotor system 3 of the helicopter spins due to a fault, the engine power is continuously reduced artificially to make the rotation speed of the transmission system 2 lower than that of the main rotor system 1, and the counter-torque between the main rotor system 1 and the transmission system 2 is disconnected by the ratchet mechanism 4, so that the helicopter is in a state without counter-torque, thereby reducing the difficulty of troubleshooting. The embodiment of the present application can slow down the falling speed and increase the troubleshooting time after the helicopter engine loses power due to a fault through the setting of the ratchet mechanism 4, and after the tail rotor system 3 of the helicopter spins due to a fault, the difficulty of troubleshooting can be reduced, thereby improving the safety of the helicopter.

[0035] In one embodiment, if Figure 3 , Figure 4As shown, in order to realize the embedding connection between the elastic member 422, the pawl sleeve 423 and the pawl 421, a first embedding groove 424 is provided on the pawl sleeve 423, and a second embedding groove 425 is provided on the pawl 421. The second embedding groove 425 extends from the first end 4211 of the pawl 421 to the second end 4212 of the pawl 421. One end of the elastic member 422 is embedded in the first embedding groove 424, and the other end of the elastic member 422 is embedded in the second embedding groove 425. Preferably, the elastic member 422 is a V-shaped spring sheet.

[0036] In one embodiment, the cross section of the pawl 421 is whistle-shaped, and the second embedding groove 425 extends from the head of the whistle shape to the tail of the whistle shape, and the V-shaped spring piece is embedded from the head of the whistle shape into the tail. Since the V-shaped spring piece is embedded in the pawl 421, the tail of the whistle shape is pressed against the ratchet groove 412 under the tension of the V-shaped spring piece.

[0037] In order to realize the connection between the pawl 421 and the pawl sleeve 423, a conformal groove 426 adapted to the first end 4211 of the pawl 421 is provided on the outer circumference of the pawl sleeve 423, and the first end 4211 of the pawl 421 is located in the conformal groove 426, and the first end 4211 of the pawl 421 can rotate in the conformal groove 426. Preferably, the number of the pawl 421 and the elastic member 422 can be one or more, for example, the number of the pawl 421 and the elastic member 422 can be two, three or four. A plurality of pawls 421 are arranged at intervals along the outer circumference of the pawl sleeve 423.

[0038] In one embodiment, if Figures 5 to 9 As shown, the ratchet assembly 41 further includes a ratchet shaft cover 413 and a sealing ring 414. The ratchet shaft cover 413 is sleeved on the pawl shaft sleeve 423, and the ratchet shaft cover 413 is located above the pawl 421. A sealing groove 419 is provided on the lower surface of the ratchet shaft cover 413, and the sealing ring 414 is located in the sealing groove 419. The ratchet shaft cover 413 is sealed and connected to the upper surface of the ratchet shaft sleeve 411 through the sealing ring 414. Preferably, the sealing ring 414 is located on the outer side of the pawl 421, so as to seal the pawl 421 part.

[0039] In order to realize the connection between the ratchet shaft cover 413 and the ratchet shaft sleeve 411, a bolt through hole 4131 is provided on the ratchet shaft cover 413, and a corresponding bolt threaded hole 415 is provided on the ratchet shaft sleeve 411. After one end of the fastening bolt 416 passes through the bolt through hole 4131 on the ratchet shaft cover 413, it is threadedly connected with the corresponding bolt threaded hole 415 on the ratchet shaft sleeve 411. In this embodiment, the sealing ring 414 and the fastening bolt 416 can make the ratchet shaft sleeve 411 and the ratchet shaft cover 413 more firmly fixed, and can realize the sealing between the ratchet shaft sleeve 411 and the ratchet shaft cover 413. Preferably, the number of the fastening bolts 416 can be one or more, for example, the number of fasteners can be two, three or four.

[0040] In one embodiment, in order to inject oil into the ratchet mechanism 4, an oil injection hole 417 and an exhaust hole 418 are provided on the ratchet shaft cover 413, which penetrate the ratchet shaft cover 413 from top to bottom. The oil injection hole 417 and the exhaust hole 418 are located in the inner circle of the sealing groove 419, and are located between the inner wall of the ratchet shaft sleeve 411 and the inner wall of the ratchet pawl shaft sleeve 423. The oil injection hole 417 facilitates oil injection and lubrication, while the exhaust hole 418 facilitates the exhaust of air. In other embodiments, exhaust can be performed through the oil injection hole 417, and oil can also be injected through the exhaust hole 418. Oil injection can be performed through one hole, and exhaust can be performed through the other hole.

[0041] like Figure 2 As shown, the ratchet mechanism 4 also includes a main rotor main shaft 43 and a transmission main shaft 44. One end of the main rotor main shaft 43 is detachably connected to the ratchet shaft sleeve 423, and the other end of the main rotor main shaft 43 is connected to the main rotor system 1. One end of the transmission main shaft 44 is detachably connected to the ratchet shaft sleeve 411, and the other end of the transmission main shaft 44 is connected to the transmission system 2. The connection and power transmission between the transmission system 2 and the main rotor system 1 are realized by setting the main rotor main shaft 43 and the transmission main shaft 44.

[0042] like Figure 2 , Figure 4 and Figure 7As shown, in order to realize the detachable connection between the main rotor main shaft 43 and the pawl sleeve 423, the pawl sleeve 423 includes a first cylinder 4231 and a second cylinder 4232. The diameter of the first cylinder 4231 is smaller than the diameter of the second cylinder 4232, and the bottom of the first cylinder 4231 is connected to the top of the second cylinder 4232. The first cylinder 4231 and the second cylinder 4232 are connected to form a cylindrical step structure. A first groove 431 is provided at one end of the main rotor main shaft 43, and the interior of the first cylinder 4231 is a hollow structure. The bottom of the first cylinder 4231 is provided with a first convex portion 4233 protruding toward the middle of the first cylinder 4231, and the first convex portion 4233 matches the first groove 431. When the main rotor shaft 43 is connected to the pawl sleeve 423 , one end of the main rotor shaft 43 is inserted into the first cylinder 4231 , and the first protrusion 4233 enters the first groove 431 .

[0043] like Figure 3 , Fig.10 As shown, after the main rotor shaft 43 is inserted into the ratchet sleeve 423, in order to further fix the main rotor shaft 43 and the ratchet sleeve 423, a first top screw 4234 and a first top screw threaded hole 4235 are provided on the first cylinder 4231. One end of the main rotor shaft 43 is inserted into the ratchet sleeve 423, and one end of the first top screw 4234 passes through the first top screw threaded hole 4235 and abuts against the main rotor shaft 43, thereby fixing the main rotor shaft 43. The number of the first top screw 4234 and the first top screw threaded hole 4235 can be one or more, for example, the number of the first top screw 4234 and the first top screw threaded hole 4235 can be two, three, four, etc. A plurality of first top screws 4234 and a plurality of first top screw threaded holes 4235 can be arranged at intervals along the outer circumferential surface of the first cylinder 4231.

[0044] In order to realize the detachable connection between the transmission main shaft 44 and the ratchet shaft sleeve 411, the ratchet shaft sleeve 411 includes a third cylinder 4111 and a fourth cylinder 4112, the diameter of the fourth cylinder 4112 is smaller than the diameter of the third cylinder 4111, and the bottom of the third cylinder 4111 is connected to the top of the fourth cylinder 4112. The third cylinder 4111 and the fourth cylinder 4112 are connected to form a cylindrical terrace structure, and the interior of the fourth cylinder 4112 is a hollow structure. One end of the transmission main shaft 44 is provided with a second groove 441, and the top of the fourth cylinder 4112 is provided with a second convex portion 4114 protruding toward the middle of the fourth cylinder 4112, and the second convex portion 4114 matches the second groove 441. When the transmission main shaft 44 is connected to the ratchet shaft sleeve 411, one end of the transmission main shaft 44 is inserted into the fourth cylinder 4112, and the second convex portion 4114 enters the second groove 441.

[0045] After the transmission main shaft 44 is inserted into the fourth cylinder 4112, in order to further fix the transmission main shaft 44 and the ratchet sleeve 411, a second top screw 4115 and a second top screw threaded hole 4116 are provided on the fourth cylinder 4112. One end of the transmission main shaft 44 is inserted into the ratchet sleeve 411, and one end of the second top screw 4115 passes through the second top screw threaded hole 4116 and abuts against the transmission main shaft 44, thereby fixing the transmission main shaft 44. The number of the second top screw 4115 and the second top screw threaded hole 4116 can be one or more, for example, the number of the second top screw 4115 and the second top screw threaded hole 4116 can be two, three or four. A plurality of second top screws 4115 and a plurality of second top screw threaded holes 4116 can be arranged at intervals along the outer circumferential surface of the fourth cylinder 4112.

[0046] In the ratchet mechanism 4 of the embodiment of the present application, when the rotation speed of the ratchet assembly 41 is higher than the rotation speed of the pawl assembly 42, the ratchet assembly 41 pushes the pawl assembly 42 to rotate. Specifically, the transmission main shaft 44 is inserted into the ratchet sleeve 411, and the second protrusion 4114 cooperates with the second groove 441 to transmit torque. When the rotation speed of the transmission main shaft 44 is higher than the rotation speed of the pawl 421, the ratchet sleeve 411 is provided with a ratchet groove 412 in the shape of a barb, and the pawl 421 is abutted against the ratchet groove 412 under the elastic force of the elastic member 422, and the ratchet sleeve 411 pushes the pawl 421 to rotate. Since the first end 4211 of the pawl 421 is located in the conformal groove 426, when the pawl 421 rotates, it will push the pawl sleeve 423 to rotate, and the pawl sleeve 423 drives the main rotor main shaft 43 to rotate.

[0047] When the rotation speed of the ratchet assembly 41 is lower than that of the pawl assembly 42, the ratchet assembly 41 slides relative to the pawl assembly 42. Specifically, the transmission main shaft 44 pushes the ratchet shaft sleeve 411 to rotate, and the ratchet shaft sleeve 411 is provided with a ratchet groove 412 in a barbed shape. Since the elastic member 422 is compressible and the rotation speed of the pawl 421 is higher than that of the ratchet shaft sleeve 411, the pawl 421 will continuously slide out from the opening of the ratchet groove 412 and enter the next ratchet groove 412.

[0048] The working principle of the helicopter ratchet system of this application is as follows:

[0049] In the normal start mode of the helicopter, the ratchet mechanism 4 enters the normal mode. In the normal mode, the transmission main shaft 44 drives the ratchet sleeve 411 to rotate, and the ratchet sleeve 411 drives the ratchet sleeve 423 to rotate through the ratchet 421, thereby driving the main rotor system 1 to rotate, and the transmission system 2 completes the power transmission to the main rotor system 1 through the ratchet mechanism 4.

[0050] After the helicopter engine fails and loses power, the ratchet mechanism 4 enters the protection mode. In the protection mode, the rotation speed of the transmission main shaft 44 is lower than that of the main rotor main shaft 43, and relative sliding occurs between the ratchet sleeve 411 and the ratchet pawl 421. The ratchet mechanism 4 disconnects the power transmission between the transmission system 2 and the main rotor system 1, and the main rotor system 1 is in a free rotation state, which slows down the falling speed and increases the time for troubleshooting.

[0051] After the tail rotor system 3 of the helicopter spins due to a fault, the ratchet mechanism 4 is passively put into the protection mode by artificially continuously reducing the engine power. In the protection mode, the rotation speed of the transmission main shaft 44 is lower than that of the main rotor main shaft 43, and relative sliding occurs between the ratchet shaft sleeve 411 and the ratchet pawl 421. The ratchet mechanism 4 disconnects the counter-torque between the main rotor system 1 and the transmission system 2, and the helicopter is in a state without counter-torque, which reduces the difficulty of troubleshooting.

[0052] It should be noted that the above-mentioned "main rotor system 1", "transmission system 2" and "tail rotor system 3" are all components of existing helicopters, which are prior art, and the connection between the transmission system 2 and the tail rotor system 3 is also prior art, and there is no improvement to their structures in this application. The connection between the main rotor system 1 and the main rotor shaft 43, and between the transmission system 2 and the transmission shaft 44 can also be prior art.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0054] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0055] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A helicopter ratchet system, comprising a main rotor system, a transmission system, a tail rotor system and a ratchet mechanism, wherein the ratchet mechanism connects the main rotor system and the transmission system, and the transmission system is connected to the tail rotor system, characterized in that: The ratchet mechanism comprises: A ratchet assembly, the ratchet assembly comprising a ratchet sleeve, the ratchet sleeve being connected to the transmission system, the inner wall of the ratchet sleeve being provided with a circle of ratchet grooves having a barbed cross section, the opening of the ratchet grooves being oriented in the rotation direction of the ratchet sleeve; A pawl assembly, the pawl assembly includes a pawl, an elastic member and a pawl sleeve, the pawl sleeve is connected to the main rotor system, the ratchet sleeve is sleeved on the pawl sleeve, the pawl is located between the pawl sleeve and the ratchet sleeve, one end of the elastic member is embedded in the pawl sleeve, the other end of the elastic member is embedded in the pawl, the first end of the pawl is abutted against the pawl sleeve, and the second end of the pawl is abutted against the ratchet groove under the elastic force of the elastic member.

2. The helicopter ratchet system according to claim 1, characterized in that: The pawl shaft sleeve is provided with a first embedding groove, the pawl is provided with a second embedding groove, the second embedding groove extends from the first end of the pawl to the second end of the pawl, one end of the elastic member is embedded in the first embedding groove, and the other end of the elastic member is embedded in the second embedding groove.

3. The helicopter ratchet system according to claim 2, characterized in that: The elastic member is a V-shaped spring sheet, and the cross section of the pawl is in a whistle shape.

4. The helicopter ratchet system according to claim 3, characterized in that: A conformal groove matched with the first end of the pawl is formed on the outer circumferential surface of the pawl sleeve, the first end of the pawl is located in the conformal groove, and the first end of the pawl can rotate in the conformal groove.

5. The helicopter ratchet system according to any one of claims 1 to 4, characterized in that: The ratchet assembly also includes a ratchet shaft cover, a sealing ring and a fastener, the ratchet shaft cover is sleeved on the pawl shaft sleeve, a sealing groove is provided on the lower surface of the ratchet shaft cover, the sealing ring is located in the sealing groove, and the ratchet shaft cover is sealed and connected to the upper surface of the ratchet shaft sleeve through the sealing ring; a bolt through hole is provided on the ratchet shaft cover, and a corresponding bolt threaded hole is provided on the ratchet shaft sleeve, and one end of the fastener passes through the bolt through hole on the ratchet shaft cover and is threadedly connected with the corresponding bolt threaded hole on the ratchet shaft sleeve.

6. The helicopter ratchet system according to claim 5, characterized in that: The ratchet shaft cover is provided with an oil filling hole and an exhaust hole which pass through the ratchet shaft cover from top to bottom. The oil filling hole and the exhaust hole are located in the inner circle of the sealing groove, and are located between the inner wall of the ratchet shaft sleeve and the inner wall of the pawl shaft sleeve.

7. The helicopter ratchet system according to any one of claims 1 to 4, characterized in that: The ratchet mechanism also includes a main rotor shaft and a transmission shaft, one end of the main rotor shaft is detachably connected to the ratchet sleeve, and the other end of the main rotor shaft is connected to the main rotor system; one end of the transmission shaft is detachably connected to the ratchet sleeve, and the other end of the transmission shaft is connected to the transmission system.

8. The helicopter ratchet system according to claim 7, characterized in that: A first groove is provided at one end of the main rotor shaft, and a first convex portion is provided inside the pawl sleeve, and the first convex portion matches the first groove.

9. The helicopter ratchet system according to claim 7, characterized in that: A second groove is provided at one end of the transmission main shaft, and a second convex portion is provided on the ratchet shaft sleeve, and the second convex portion matches the second groove.

10. The helicopter ratchet system according to claim 7, characterized in that: The pawl shaft sleeve is provided with a first top screw and a first top screw threaded hole, one end of the main rotor main shaft is inserted into the pawl shaft sleeve, and one end of the first top screw passes through the first top screw threaded hole and abuts against the main rotor main shaft; the ratchet shaft sleeve is provided with a second top screw and a second top screw threaded hole, one end of the transmission main shaft is inserted into the ratchet shaft sleeve, and one end of the second top screw passes through the second top screw threaded hole and abuts against the transmission main shaft.

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