Helicopter ratchet system

Abstract

The application 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 and a pawl assembly. The ratchet assembly comprises a ratchet shaft sleeve. The ratchet shaft sleeve is connected with the transmission system. A ratchet groove with an inverted hook-shaped cross section is arranged on 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 member and a pawl shaft sleeve. The pawl shaft sleeve is connected with the main rotor system. One end of the elastic member is embeddedly connected with the pawl shaft sleeve. The other end of the elastic member is embeddedly connected with the pawl. The first end of the pawl is abutted with the pawl shaft sleeve. The second end of the pawl is abutted with the ratchet groove under the elastic force of the elastic member. The helicopter ratchet system can slow down the falling speed after the engine failure, increase the troubleshooting time, reduce the troubleshooting difficulty after the tail rotor system spins due to the failure, and improve the safety of the helicopter.

Description

TECHNICAL FIELD

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

[0002] With the long-term development of helicopters, the design of helicopters gradually matures. A helicopter mainly includes a body structure, a main rotor system, a tail rotor system, a transmission system and a power system. As a complex aircraft, the helicopter faces some safety hazards in use, for example, the helicopter will quickly lose power after engine failure; and the helicopter will spin after tail rotor failure. The behavior change of the helicopter under these two sudden events makes the helicopter a high-risk carrier, so that the survival probability of personnel after failure is very low. SUMMARY

[0003] The helicopter ratchet system provided by the embodiments of the present application solves the safety problems of the helicopter after losing power quickly after engine failure and spinning after tail rotor failure, and the technical solutions are as follows:

[0004] The helicopter ratchet system provided by the embodiments of the present application includes a main rotor system, a transmission system, a tail rotor system and a pawl mechanism. The pawl mechanism is connected to the main rotor system and the transmission system. The transmission system is connected to the tail rotor system. The pawl mechanism includes:

[0005] A ratchet assembly includes a ratchet shaft sleeve. The ratchet shaft sleeve is connected to the transmission system. A ratchet groove with an inverted hook-shaped cross section is formed on the inner wall of the ratchet shaft sleeve. The opening of the ratchet groove faces the rotation direction of the ratchet shaft sleeve.

[0006] A pawl assembly includes a pawl, a resilient member and a pawl shaft sleeve. The pawl shaft sleeve is connected to the main rotor system. The ratchet shaft sleeve is sleeved on the pawl shaft sleeve. The pawl is located between the pawl shaft sleeve and the ratchet shaft sleeve. One end of the resilient member is embeddedly connected to the pawl shaft sleeve, and the other end of the resilient member is embeddedly connected to the pawl. The first end of the pawl abuts against the pawl shaft sleeve, and the second end of the pawl abuts against the ratchet groove under the elastic force of the resilient member.

[0007] In one embodiment, a first embedding groove is formed on the pawl shaft sleeve, and a second embedding groove is formed on the pawl. The second embedding groove extends from the first end of the pawl to the second end of the pawl. One end of the resilient member is embedded in the first embedding groove, and the other end of the resilient member is embedded in the second embedding groove.

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

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

[0010] In one embodiment, the ratchet wheel assembly further comprises a ratchet wheel shaft cover, a sealing ring and a fastener, the ratchet wheel shaft cover is sleeved on the pawl sleeve, a sealing groove is formed on the lower surface of the ratchet wheel shaft cover, the sealing ring is located in the sealing groove, and the ratchet wheel shaft cover is sealingly connected with the upper surface of the pawl sleeve through the sealing ring; a bolt through hole is formed on the ratchet wheel shaft cover, a corresponding bolt threaded hole is formed on the pawl sleeve, and one end of the fastener is screwed into the corresponding bolt threaded hole on the pawl sleeve through the bolt through hole on the ratchet wheel shaft cover.

[0011] In one embodiment, an oil injection hole and an exhaust hole are formed on the ratchet wheel shaft cover and pass through the ratchet wheel shaft cover from top to bottom, the oil injection hole and the exhaust hole are located in the inner ring of the sealing groove, and the oil injection hole and the exhaust hole are located between the inner wall of the pawl sleeve and the inner wall of the pawl sleeve.

[0012] In one embodiment, the ratchet wheel mechanism further comprises a main rotor main shaft and a transmission main shaft, one end of the main rotor main shaft is detachably connected with the pawl sleeve, and the other end of the main rotor main shaft is connected with the main rotor system; one end of the transmission main shaft is detachably connected with the pawl sleeve, and the other end of the transmission main shaft is connected with the transmission system.

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

[0014] In one embodiment, one end of the transmission main shaft is provided with a second groove, and the pawl sleeve is provided with a second protrusion, and the second protrusion matches the second groove.

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

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

[0017] The helicopter ratchet system of the embodiment of the application comprises a main rotor system, a transmission system, a tail rotor system and a ratchet mechanism, the ratchet mechanism comprising a ratchet assembly and a pawl assembly. In the normal starting mode of the helicopter, the transmission system drives the ratchet shaft sleeve to rotate, the ratchet shaft sleeve drives the pawl shaft sleeve to rotate through the pawl, and then drives 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 arrangement 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 pawl shaft sleeve and the ratchet shaft sleeve slide relatively, 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 rotating state, which slows down the falling speed of the helicopter and increases the troubleshooting time. After the tail rotor system of the helicopter self-rotates due to failure, the engine power is continuously reduced by human intervention, so that the rotation speed of the transmission system is lower than that of the main rotor system, and the counter torque between the main rotor system and the transmission system is disconnected through the ratchet mechanism, so that the helicopter is in a state of no counter torque, which reduces the difficulty of troubleshooting. Through the arrangement of the ratchet mechanism, the falling speed can be slowed down and the troubleshooting time can be increased after the helicopter engine fails and loses power, and the difficulty of troubleshooting can be reduced after the tail rotor system of the helicopter self-rotates due to failure, thereby improving the safety of the helicopter.

[0018] The above summary is intended to illustrate only and is not intended to limit the application in any way. Further aspects, implementations, and features of the application will be apparent from the drawings and the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0019] In the drawings, like numerals refer to like elements throughout the various drawings. The drawings are not necessarily to scale, the emphasis instead being placed on the relations between various parts and on the characteristics thereof. It should be understood that the drawings only depict some embodiments in accordance with the disclosure and should not be considered limiting the scope of the disclosure.

[0020] Figure 1 FIG. 1 is a structural schematic diagram of a helicopter ratchet system;

[0021] Figure 2 FIG. 4 is a schematic diagram of a ratchet mechanism;

[0022] Figure 3 FIG. 5 is an exploded view of the ratchet mechanism;

[0023] Figure 4 FIG. 6 is a structural schematic diagram of a pawl assembly;

[0024] Figure 5 FIG. 7 is a structural schematic diagram of a ratchet assembly;

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

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

[0027] Figure 8 is a combined schematic view of the ratchet shaft cover and the pawl assembly;

[0028] Figure 9 is a schematic view of the structure of the ratchet shaft cover and the sealing ring;

[0029] Figure 10 is a sectional view of the ratchet shaft sleeve after being connected with the transmission main shaft;

[0030] BRIEF DESCRIPTION OF DRAWINGS

[0031] 1, main rotor system; 2, transmission system; 3, tail rotor system; 4, ratchet mechanism; 41, ratchet assembly; 42, pawl assembly; 411, ratchet shaft sleeve; 412, ratchet groove; 421, pawl; 4211, first end portion; 4212, second end portion; 422, elastic member; 423, pawl shaft sleeve; 424, first embedding groove; 425, second embedding groove; 426, conformal groove; 413, ratchet shaft cover; 4131, bolt through hole; 414, sealing ring; 419, sealing groove; 415, bolt threaded hole; 416, fastening bolt; 417, oil injection hole; 418, exhaust hole; 43, main rotor main shaft; 44, transmission main shaft; 4231, first cylinder; 4232, second cylinder; 431, first recess; 4233, first protrusion; 4234, first jackscrew; 4235, first jackscrew threaded hole; 4111, third cylinder; 4112, fourth cylinder; 441, second recess; 4114, second protrusion; 4115, second jackscrew; 4116, second jackscrew threaded hole. DETAILED DESCRIPTION

[0032] Hereinafter, only certain exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.

[0033] As Figures 1 to 4As shown, the helicopter ratchet system provided by the embodiment of the application comprises a main rotor system 1, a transmission system 2, a tail rotor system 3 and a ratchet mechanism 4. The ratchet mechanism 4 is connected to the main rotor system 1 and the transmission system 2. The transmission system 2 is connected to the tail rotor system 3. The ratchet mechanism 4 comprises a ratchet assembly 41 and a pawl assembly 42. The ratchet assembly 41 comprises a ratchet shaft sleeve 411. The ratchet shaft sleeve 411 is connected to the transmission system 2. A ratchet groove 412 in the shape of an inverted hook is formed in the inner wall of the ratchet shaft sleeve 411. The opening of the ratchet groove 412 is directed to the rotating direction of the ratchet shaft sleeve 411. The pawl assembly 42 comprises a pawl 421, an elastic member 422 and a pawl shaft sleeve 423. The pawl shaft sleeve 423 is connected to the main rotor system 1. The ratchet shaft sleeve 411 is sleeved on the pawl shaft sleeve 423. The pawl 421 is located between the pawl shaft sleeve 423 and the ratchet shaft sleeve 411. One end of the elastic member 422 is embeddedly connected to the pawl shaft sleeve 423. The other end of the elastic member 422 is embeddedly connected to the pawl 421. The first end portion 4211 of the pawl 421 abuts against the pawl shaft sleeve 423. The second end portion 4212 of the pawl 421 abuts against the ratchet groove 412 under the elastic force of the elastic member 422.

[0034] In the normal starting mode of the helicopter, the transmission system 2 drives the ratchet shaft sleeve 411 to rotate. The ratchet shaft sleeve 411 drives the pawl shaft sleeve 423 to rotate through the pawl 421. Then the main rotor system 1 is driven to rotate. The power transmission from the transmission system 2 to the main rotor system 1 is completed through the ratchet mechanism 4. After the power loss of the helicopter engine due to failure, the rotating speed of the transmission system 2 is lower than that of the main rotor system 1. Due to the arrangement of the elastic member 422 and the ratchet groove 412, the pawl 421 will continuously slide out of the current ratchet groove 412 and slide into the next ratchet groove 412. Thus, the relative sliding between the pawl shaft sleeve 423 and the ratchet shaft sleeve 411 occurs. The power transmission between the transmission system 2 and the main rotor system 1 is disconnected through the ratchet mechanism 4. The main rotor system 1 is in a free rotating state. The falling speed of the helicopter is slowed down. The time for troubleshooting is increased. After the tail rotor system 3 of the helicopter self-rotates due to failure, the engine power is continuously reduced by human beings. The rotating speed of the transmission system 2 is lower than that of the main rotor system 1. The counter torque between the main rotor system 1 and the transmission system 2 is disconnected through the ratchet mechanism 4. The helicopter is in a state without counter torque. The difficulty for troubleshooting is reduced. Through the arrangement of the ratchet mechanism 4, the falling speed of the helicopter is slowed down after the power loss of the helicopter engine due to failure. The time for troubleshooting is increased. After the tail rotor system 3 of the helicopter self-rotates due to failure, the difficulty for troubleshooting is reduced. Thus, the safety of the helicopter is improved.

[0035] In an embodiment, as shown in FIG. 1, Figure 3 , Figure 4As shown, in order to realize the embedded connection of the elastic member 422 and the pawl shaft sleeve 423 and the pawl 421, a first embedded groove 424 is formed on the pawl shaft sleeve 423, and a second embedded groove 425 is formed on the pawl 421 and extends from the first end portion 4211 of the pawl 421 to the second end portion 4212 of the pawl 421. One end of the elastic member 422 is embedded in the first embedded groove 424, and the other end of the elastic member 422 is embedded in the second embedded groove 425. Preferably, the elastic member 422 is a V-shaped elastic piece.

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

[0037] In order to realize the connection of the pawl 421 and the pawl shaft sleeve 423, a conformal groove 426 is formed on the outer circumferential surface of the pawl shaft sleeve 423 and matches the first end portion 4211 of the pawl 421, the first end portion 4211 of the pawl 421 is located in the conformal groove 426, and the first end portion 4211 of the pawl 421 can rotate in the conformal groove 426. Preferably, the number of pawls 421 and elastic members 422 can be one or more, for example, the number of pawls 421 and elastic members 422 can be two, three or four, etc. The plurality of pawls 421 are arranged at intervals along the outer circumferential surface of the pawl shaft sleeve 423.

[0038] In an embodiment, as shown, Figures 5 to 9 The ratchet assembly 41 further comprises 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. The lower surface of the ratchet shaft cover 413 is provided with a sealing groove 419, the sealing ring 414 is located in the sealing groove 419, and the ratchet shaft cover 413 is sealingly connected with 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, thereby sealing part of the pawl 421.

[0039] In order to realize the connection between the ratchet cover 413 and the ratchet sleeve 411, a bolt through hole 4131 is arranged on the ratchet cover 413, and a corresponding bolt threaded hole 415 is arranged on the ratchet sleeve 411. One end of the fastening bolt 416 is threaded through the bolt through hole 4131 on the ratchet cover 413 and is screwed with the corresponding bolt threaded hole 415 on the ratchet sleeve 411. In this embodiment, the sealing ring 414 and the fastening bolt 416 can make the connection between the ratchet sleeve 411 and the ratchet cover 413 more firm, and can realize the sealing between the ratchet sleeve 411 and the ratchet cover 413. Preferably, the number of fastening bolts 416 can be one or more, for example, the number of fastening bolts can be two, three or four, etc.

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

[0041] As shown in Figure 2 , the ratchet mechanism 4 further comprises a main rotor shaft 43 and a transmission shaft 44. One end of the main rotor shaft 43 is detachably connected with the pawl sleeve 423, and the other end of the main rotor shaft 43 is connected with the main rotor system 1. One end of the transmission shaft 44 is detachably connected with the ratchet sleeve 411, and the other end of the transmission shaft 44 is connected with the transmission system 2. The main rotor shaft 43 and the transmission shaft 44 are arranged to realize the connection and power transmission between the transmission system 2 and the main rotor system 1.

[0042] As shown in Figure 2 , Figure 4 and Figure 7As shown, in order to realize the detachable connection of the main rotor main shaft 43 and the ratchet sleeve 423, the ratchet sleeve 423 comprises a first cylinder 4231 and a second cylinder 4232, the diameter of the first cylinder 4231 is smaller than that of the second cylinder 4232, and the bottom of the first cylinder 4231 is connected with the top of the second cylinder 4232. The first cylinder 4231 and the second cylinder 4232 form a cylindrical terrace structure after being connected. One end of the main rotor main shaft 43 is provided with a first groove 431, the inside of the first cylinder 4231 is a hollow structure, and the bottom of the first cylinder 4231 is provided with a first protrusion 4233 protruding to the middle of the first cylinder 4231, and the first protrusion 4233 matches the first groove 431. When the main rotor main shaft 43 is connected with the ratchet sleeve 423, one end of the main rotor main shaft 43 is inserted into the inside of the first cylinder 4231, and the first protrusion 4233 enters the first groove 431.

[0043] As shown in Figure 3 , Figure 10 After the main rotor main shaft 43 is inserted into the inside of the ratchet sleeve 423, in order to further fix the main rotor main shaft 43 and the ratchet sleeve 423, a first jack 4234 and a first jack threaded hole 4235 are arranged on the first cylinder 4231. One end of the main rotor main shaft 43 is inserted into the ratchet sleeve 423, one end of the first jack 4234 passes through the first jack threaded hole 4235 and abuts against the main rotor main shaft 43, so as to fix the main rotor main shaft 43. The number of the first jack 4234 and the first jack threaded hole 4235 can be one or more, for example, the number of the first jack 4234 and the first jack threaded hole 4235 can be two, three, four, etc. A plurality of first jacks 4234 and a plurality of first jack threaded holes 4235 can be arranged at intervals along the outer peripheral surface of the first cylinder 4231.

[0044] In order to realize the detachable connection of the transmission main shaft 44 and the ratchet sleeve 411, the ratchet sleeve 411 comprises a third cylinder 4111 and a fourth cylinder 4112, the diameter of the fourth cylinder 4112 is smaller than that of the third cylinder 4111, and the bottom of the third cylinder 4111 is connected with the top of the fourth cylinder 4112. The third cylinder 4111 and the fourth cylinder 4112 form a cylindrical terrace structure after being connected, and the inside of the fourth cylinder 4112 is a hollow structure. One end of the transmission main shaft 44 is provided with a second groove 441, the top of the fourth cylinder 4112 is provided with a second protrusion 4114 protruding to the middle of the fourth cylinder 4112, and the second protrusion 4114 matches the second groove 441. When the transmission main shaft 44 is connected with the ratchet sleeve 411, one end of the transmission main shaft 44 is inserted into the inside of the fourth cylinder 4112, and the second protrusion 4114 enters the inside of 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, the second jack 4115 and the second jack threaded hole 4116 are arranged 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 jack 4115 passes through the second jack threaded hole 4116 and abuts against the transmission main shaft 44, thereby fixing the transmission main shaft 44. The number of the second jack 4115 and the second jack threaded hole 4116 can be one or more, for example, the number of the second jack 4115 and the second jack threaded hole 4116 can be two, three or four, etc. The plurality of second jacks 4115 and the plurality of second jack threaded holes 4116 can be arranged at intervals along the outer circumferential surface of the fourth cylinder 4112.

[0046] When the rotation speed of the ratchet assembly 41 is higher than that of the pawl assembly 42, the ratchet assembly 41 drives 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 that of the pawl 421, the ratchet sleeve 411 is provided with a ratchet groove 412 in the form of a barb, the pawl 421 abuts against the ratchet groove 412 under the elastic force of the elastic member 422, and the ratchet sleeve 411 drives the pawl 421 to rotate. Since the first end portion 4211 of the pawl 421 is located in the contour groove 426, the pawl 421 drives the ratchet sleeve 423 to rotate when the pawl 421 rotates, and the ratchet sleeve 423 drives the main rotor 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 drives the ratchet sleeve 411 to rotate, and the ratchet sleeve 411 is provided with a ratchet groove 412 in the form of a barb. Since the elastic member 422 is compressible, and the rotation speed of the pawl 421 is higher than that of the ratchet sleeve 411, the pawl 421 will continuously slide out of the opening portion of the ratchet groove 412 and enter the next ratchet groove 412.

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

[0049] In the normal starting 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, the ratchet sleeve 411 drives the ratchet sleeve 423 to rotate through the pawl 421, and then drives the main rotor system 1 to rotate, thereby completing the power transmission of the transmission system 2 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, the relative sliding occurs between the ratchet sleeve 411 and the pawl 421, the ratchet mechanism 4 disconnects the power transmission between the transmission system 2 and the main rotor system 1, the main rotor system 1 is in a free rotation state, the falling speed is slowed down, and the troubleshooting time is increased.

[0051] After the tail rotor system 3 of the helicopter spins due to a failure, the ratchet mechanism 4 is passively brought 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, the relative sliding occurs between the ratchet sleeve 411 and the pawl 421, the ratchet mechanism 4 disconnects the counter torque between the main rotor system 1 and the transmission system 2, the helicopter is in a state without counter torque, and the troubleshooting difficulty is reduced.

[0052] It should be noted that the above-mentioned "main rotor system 1", "transmission system 2" and "tail rotor system 3" are all components on the existing helicopter, which are prior art, the connection between the transmission system 2 and the tail rotor system 3 is also prior art, and the present application does not improve the structure. The connection between the main rotor system 1 and the main rotor main shaft 43, and the connection between the transmission system 2 and the transmission main shaft 44 can also be prior art.

[0053] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection 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 can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0054] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one feature. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0055] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of various changes or replacements within the technical range disclosed by the present application, and these should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to 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, said ratchet mechanism connecting said main rotor system and said transmission system, said transmission system being connected to said tail rotor system, characterized in that, The ratchet mechanism comprises: The ratchet assembly comprises a ratchet sleeve connected with the transmission system, an inner wall of the ratchet sleeve is provided with a circle of ratchet grooves in inverted hook shape, and the opening of the ratchet groove faces the rotating direction of the ratchet sleeve; The pawl assembly comprises a pawl, an elastic member and a pawl sleeve, the pawl sleeve is connected with 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 embeddedly connected with the pawl sleeve, the other end of the elastic member is embeddedly connected with the pawl, the first end of the pawl abuts against the pawl sleeve, and the second end of the pawl abuts 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 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, wherein, The elastic member is a V-shaped elastic sheet, and the cross section of the pawl is in the shape of a whistle.

4. The helicopter ratchet system of claim 3, wherein, The outer circumferential surface of the pawl sleeve is provided with a contour groove matched with the first end of the pawl, the first end of the pawl is located in the contour groove, and the first end of the pawl can rotate in the contour groove.

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

6. The helicopter ratchet system of claim 5, wherein, The ratchet shaft cover is provided with an oil injection hole and an exhaust hole penetrating through the ratchet shaft cover, the oil injection hole and the exhaust hole are located in the inner circle of the sealing groove, and the oil injection hole and the exhaust hole are located between the inner wall of the ratchet sleeve and the inner wall of the pawl sleeve.

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

8. The helicopter ratchet system of claim 7, wherein, One end of the main rotor main shaft is provided with a first groove, the inside of the pawl sleeve is provided with a first protrusion, and the first protrusion is matched with the first groove.

9. The helicopter ratchet system of claim 7, wherein, One end of the transmission main shaft is provided with a second groove, the ratchet sleeve is provided with a second protrusion, and the second protrusion is matched with the second groove.

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

Images