Rotor head and helicopter

Abstract

The utility model discloses a rotor head and a helicopter, and relates to the technical field of aircrafts. The rotor head comprises a propeller hub, a connecting mechanism, a propeller clamp and an adjusting transmission mechanism, a rotor main shaft of the helicopter is sleeved with the propeller hub, the connecting mechanism is connected to the propeller hub and comprises a transverse shaft, the transverse shaft is rotatably sleeved with the propeller clamp, the propeller clamp is used for being connected with a propeller blade, and the adjusting transmission mechanism is in transmission connection with the propeller clamp. The adjusting transmission mechanism is used for driving the paddle clamp to rotate relative to the transverse shaft, one of the paddle clamp and the connecting mechanism is provided with a limiting groove, the other one of the paddle clamp and the connecting mechanism is provided with a limiting protrusion, and the limiting protrusion is inserted into the limiting groove so as to limit the rotating stroke interval of the paddle clamp relative to the transverse shaft. By means of the arrangement, even if control over rotation of the propeller clamp is lost due to damage of the adjusting transmission mechanism, the propeller clamp does not rotate at will at a large angle and is kept within a certain rotation stroke interval, and therefore the safety of the helicopter can be improved.

Description

Technical Field

[0001] This application relates to the technical field of aircraft, and more particularly, to a rotor head and a helicopter. Background Art

[0002] In existing helicopters, the blades are usually connected to the rotor main shaft of the helicopter through a rotor head. The rotor head includes blade grips, and the blade grips can be controllably rotated to adjust the pitch angle of the blades, thereby adjusting the lift and drag distribution to achieve flight states such as hovering, climbing, and landing of the helicopter. However, existing helicopters are at risk of the blade grips rotating out of control. In related helicopters, once the adjustment device for controlling the rotation of the blade grips is damaged, the rotation angle of the blade grips is likely to get out of control and be unrestricted, which will cause the helicopter to get out of control or even be damaged. Summary of the Utility Model

[0003] An object of this application is to provide a rotor head and a helicopter that can limit the rotation angle of the blade grips after the helicopter loses control of the rotation of the blade grips, thereby improving the safety of the helicopter.

[0004] The embodiments of this application can be implemented as follows:

[0005] In a first aspect, this application provides a rotor head for use in a helicopter. The rotor head includes a hub, a connection mechanism, blade grips, and an adjustment transmission mechanism. The hub is for sleeving on the rotor main shaft of the helicopter. The connection mechanism is connected to the hub. The connection mechanism includes a transverse shaft. The blade grips are rotatably sleeved on the transverse shaft. The blade grips are for connecting the blades. The adjustment transmission mechanism is in transmission connection with the blade grips and is for driving the blade grips to rotate relative to the transverse shaft. One of the blade grips and the connection mechanism is provided with a limiting groove, and the other of the blade grips and the connection mechanism is provided with a limiting protrusion. The limiting protrusion is inserted into the limiting groove to define the rotation stroke interval of the blade grips relative to the transverse shaft.

[0006] In an optional embodiment, the connection mechanism includes a central connection plate assembly and two transverse shaft assemblies. The central connection plate assembly includes two central connection plates. The two central connection plates are respectively connected to opposite sides of the hub in a first direction. The two transverse shaft assemblies are spaced apart in a second direction. The first direction is perpendicular to the second direction. The limiting groove is provided on the transverse shaft assembly, and the limiting protrusion is provided at the end of the blade grip.

[0007] In an optional embodiment, the transverse shaft assembly includes a transverse shaft member. The transverse shaft member includes a connection portion and a transverse shaft. The connection portion is connected to the two central connection plates. The transverse shaft is connected to the connection portion and extends in the second direction. The limiting groove is provided on the connection portion of the transverse shaft member.

[0008] In an optional embodiment, the transverse shaft assembly further includes a limiting ring. The limiting ring is sleeved on the transverse shaft and can rotate relative to the transverse shaft. The blade grip is sleeved on the outside of the limiting ring and is fixedly connected to the limiting ring. The limiting ring is limited in the second direction.

[0009] In an alternative embodiment, the horizontal shaft assembly further includes a limiting member and a bearing. The connecting portion and the limiting member are spaced apart in the second direction. The bearing is sleeved on the horizontal shaft, and the outer peripheral surface of the bearing is used to abut against the paddle clip. The bearing and the limiting ring are arranged in the second direction, and both the bearing and the limiting ring are located between the connecting portion and the limiting member. The limiting member is used to prevent the bearing and the limiting ring from moving away from the connecting portion.

[0010] In an alternative embodiment, the horizontal shaft assembly further includes a limiting bolt. The limiting bolt is disposed through the horizontal shaft member along the second direction and is coaxially arranged with the horizontal shaft. The front end of the limiting bolt extends from the end of the horizontal shaft away from the connecting portion and is threadedly connected to the limiting member. The limiting member abuts against the end of the horizontal shaft away from the connecting portion.

[0011] In an alternative embodiment, two limiting grooves are provided on the side of the connecting portion facing the paddle clip. The two limiting grooves are spaced apart in the extending direction of the axis of the hub. The horizontal shaft is disposed between the two limiting grooves.

[0012] In an alternative embodiment, the intermediate connecting plate is rotatably connected to the hub and the rotation axis is parallel to the first direction. A relief groove is provided on the side of the connecting portion facing the hub. The relief groove is used to avoid the main rotor shaft.

[0013] In an alternative embodiment, the paddle clip includes a socket portion and a mounting portion connected to the socket portion. The socket portion is used to be sleeved on the horizontal shaft of the horizontal shaft member. The mounting portion is connected to one end of the socket portion in the axial direction. The mounting portion is used to mount the paddle blade; a limiting protrusion is provided on the end face of the socket portion away from the mounting portion.

[0014] In an alternative embodiment, the pitch adjusting transmission mechanism includes a rocker arm and a pitch change pull rod. The rocker arm is connected to the paddle clip, and the pitch change pull rod is connected to the rocker arm. The pitch change pull rod is used to drive the rocker arm to rotate relative to the horizontal shaft.

[0015] In an alternative embodiment, the rocker arm is a plate-like structure and is parallel to the third direction. The end of the pitch change pull rod is connected to one side of the rocker arm in the third direction; wherein, the third direction is parallel to the axis direction of the hub.

[0016] In an alternative embodiment, one end of the pitch change pull rod is connected to the rocker arm through a spherical rod end joint bearing.

[0017] In an alternative embodiment, an assembly groove is provided on one side of the rocker arm in the third direction. At least a part of the spherical rod end joint bearing is received in the assembly groove.

[0018] In an alternative embodiment, the rotor head includes two paddle clips and two pitch adjusting transmission mechanisms. The two pitch adjusting transmission mechanisms are respectively connected to the two paddle clips, and the rocker arms of the two pitch adjusting transmission mechanisms are respectively located on opposite sides of the hub in its radial direction.

[0019] In a second aspect, the present application provides a helicopter, which includes a rotor main shaft, blades, an adjustment drive mechanism, and a rotor head according to any one of the foregoing embodiments. The hub is sleeved on the rotor main shaft, the blades are connected to the blade grips of the rotor head, the adjustment drive mechanism is in transmission connection with the adjustment transmission mechanism of the rotor head, and the adjustment drive mechanism is used to drive the blade grips to rotate around the transverse axis.

[0020] The beneficial effects of the embodiments of the present application include, for example:

[0021] The rotor head provided by the embodiments of the present application includes a hub, a connection mechanism, blade grips, and an adjustment transmission mechanism. The hub is used to be sleeved on the rotor main shaft of the helicopter. The connection mechanism is connected to the hub. The connection mechanism includes a transverse axis. The blade grips are rotatably sleeved on the transverse axis. The blade grips are used to connect the blades. The adjustment transmission mechanism is in transmission connection with the blade grips. The adjustment transmission mechanism is used to drive the blade grips to rotate relative to the transverse axis. One of the blade grips and the connection mechanism is provided with a limiting groove, and the other of the blade grips and the connection mechanism is provided with a limiting protrusion. The limiting protrusion is inserted into the limiting groove to define the rotation stroke interval of the blade grips relative to the transverse axis. By providing the limiting protrusion and the limiting groove on the blade grips and the connection mechanism, the limiting protrusion is restricted and can only move within the limiting groove. Such a setting makes it so that even if the adjustment transmission mechanism is damaged and loses control of the rotation of the blade grips, the blade grips will not rotate arbitrarily at a large angle, but will remain within a certain rotation stroke interval. Therefore, the risk of the helicopter getting out of control and crashing can be reduced, and the safety of the helicopter can be improved.

[0022] The helicopter provided by the embodiments of the present application includes a rotor main shaft, blades, an adjustment drive mechanism, and the above-mentioned rotor head. Since the blade grips will also be restricted and will not rotate arbitrarily at a large angle after losing control, the helicopter has a high level of safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0024] Figure 1 Schematic diagram of a rotor head in an embodiment of the present application;

[0025] Figure 2 Exploded view of a rotor head in an embodiment of the present application;

[0026] Figure 3 Schematic diagram of a transverse axis assembly in an embodiment of the present application;

[0027] Figure 4Schematic diagram of the horizontal shaft member in a first perspective view in an embodiment of the present application;

[0028] Figure 5 Schematic diagram of the horizontal shaft member in a second perspective view in an embodiment of the present application;

[0029] Figure 6 Cross-sectional view of the horizontal shaft assembly in an embodiment of the present application;

[0030] Figure 7 Schematic diagram of the paddle clip in an embodiment of the present application;

[0031] Figure 8 Schematic diagram of the adjustment drive mechanism in an embodiment of the present application;

[0032] Figure 9 Schematic diagram of the rocker arm in an embodiment of the present application.

[0033] Reference numerals: 100 - hub; 200 - connecting mechanism; 210 - middle connecting plate; 220 - horizontal shaft assembly; 221 - horizontal shaft member; 2211 - assembly hole; 222 - connecting portion; 2221 - limiting groove; 2222 - avoiding groove; 223 - horizontal shaft; 224 - step surface; 225 - limiting member; 226 - bearing; 227 - limiting bolt; 228 - limiting ring; 300 - paddle clip; 310 - socket portion; 311 - limiting protrusion; 312 - positioning groove; 313 - mounting screw hole; 320 - mounting portion; 400 - adjustment drive mechanism; 410 - rocker arm; 411 - assembly groove; 412 - positioning boss; 413 - mating hole; 420 - pitch change pull rod; 430 - spherical rod end joint bearing. Detailed Description of the Specific Embodiment

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. The components of the embodiments of the present application usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0036] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0037] In the description of the present application, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0038] In addition, if terms such as "first", "second", etc. are only used for distinguishing descriptions, they cannot be understood as indicating or implying relative importance.

[0039] It should be noted that, without conflict, the features in the embodiments of the present application can be combined with each other.

[0040] In the related technology of helicopters, the pitch clamp can be controllably rotated to adjust the pitch angle of the blade, thereby adjusting the lift and drag distribution to achieve flight states such as hovering, climbing, and landing of the helicopter. However, after the mechanism for driving the pitch clamp to rotate is damaged, the pitch clamp will lose its restraint and rotate to any angle. When the pitch clamp rotates to an abnormally large angle, the blade also has an abnormally large pitch angle accordingly. At this time, the flight requirements may not be met, ultimately resulting in the loss of control of the helicopter and even damage. In addition, the rocker arm used to control the rotation of the pitch clamp in the related technology is prone to deformation, resulting in a low adjustment accuracy of the rotation angle of the pitch clamp, and further resulting in poor flight efficiency and stability of the helicopter.

[0041] In order to improve at least one of the above-mentioned deficiencies in the related technology, the embodiments of the present application provide a rotor head. By providing a limit protrusion and a limit groove, the pitch clamp is limited so that it will not rotate freely at a large angle after losing control, improving the safety of the helicopter.

[0042] Figure 1 Schematic diagram of a rotor head in an embodiment of the present application; Figure 2 Exploded view of a rotor head in an embodiment of the present application. The rotor head provided by the embodiments of the present application is applied in a helicopter, such as an unmanned helicopter or a manned helicopter. As Figure 1 and Figure 2 shown, the rotor head provided by the embodiments of the present application includes a hub 100, a connecting mechanism 200, a pitch clamp 300, and an adjusting transmission mechanism 400.

[0043] The hub 100 is used to be sleeved on the rotor main shaft of the helicopter and can rotate with the rotor main shaft. Specifically, the hub 100 can be connected to the rotor main shaft by means of spline connection or flat key connection to achieve synchronous rotation with the rotor main shaft.

[0044] The connecting mechanism 200 is connected to the hub 100. The connecting mechanism 200 includes a transverse shaft 223. The paddle clip 300 is rotatably sleeved on the transverse shaft 223. The paddle clip 300 is used to connect the paddle blades (not shown in the figure). The adjusting transmission mechanism 400 is drivingly connected to the paddle clip 300. The adjusting transmission mechanism 400 is used to drive the paddle clip 300 to rotate relative to the transverse shaft 223. It can be understood that the connecting mechanism 200 can rotate together with the hub 100 when the hub 100 rotates. The paddle clip 300 and the paddle blades will also rotate driven by the connecting mechanism 200, so as to provide lift for the helicopter. In addition, the paddle clip 300 can rotate relative to the transverse shaft 223 driven by the adjusting transmission mechanism 400, and the paddle blades can rotate with the paddle clip 300 relative to the transverse shaft 223, so that the inclination angle of the paddle blades can be changed. And the adjustment of the inclination angle of the paddle blades can change the lift of the helicopter. Therefore, by adjusting the inclination angle of the paddle blades, flight states such as hovering, climbing and landing of the helicopter can be achieved. The adjusting transmission mechanism 400 can be drivingly connected to the adjusting drive mechanism on the helicopter, and the adjusting drive mechanism provides driving force, so as to realize the adjustment of the rotation angle of the paddle clip 300.

[0045] In the embodiment of the present application, the rotor head includes two paddle clips 300, and the two paddle clips 300 are arranged in central symmetry.

[0046] Figure 3 It is a schematic diagram of the transverse shaft assembly 220 in an embodiment of the present application; Figure 4 It is a schematic diagram of the transverse shaft member 221 in the first perspective in an embodiment of the present application; Figure 5 It is a schematic diagram of the transverse shaft member 221 in the second perspective in an embodiment of the present application. Please refer to Figures 1 to 5 In the embodiment of the present application, the connecting mechanism 200 includes a central connecting plate assembly and two transverse shaft assemblies 220. The central connecting plate assembly includes two central connecting plates 210. The two central connecting plates 210 are respectively connected to opposite sides of the hub 100 in the first direction. The two transverse shaft assemblies 220 are spaced apart in the second direction, wherein the first direction is perpendicular to the second direction. The transverse shaft assembly 220 includes a transverse shaft member 221. The transverse shaft member 221 includes a connecting portion 222 and a transverse shaft 223. The connecting portion 222 is connected to the two central connecting plates 210. The transverse shaft 223 is connected to the connecting portion 222 and extends in the second direction. In this embodiment, both the first direction and the second direction are perpendicular to the axial extension direction of the hub 100. Optionally, the connecting portion 222 of the transverse shaft member 221 is arranged between the two central connecting plates 210 and is fixedly connected to the central connecting plates 210 by screws. Such an arrangement makes the transverse shaft member 221 have better stability, and the overall center of gravity of the two transverse shaft members 221 and the two central connecting plates 210 is located (or approaches) the axis of the hub 100, which is beneficial to the smoothness of the rotation of the rotor head.

[0047] Figure 6This is a cross-sectional view of the horizontal axis assembly 220 in an embodiment of the present application. Please refer to Figures 3 to 6 In this embodiment, the horizontal axis assembly 220 further includes a limit ring 228. The limit ring 228 is sleeved on the horizontal axis 223 and can rotate relative to the horizontal axis 223. The paddle clamp 300 is used to be sleeved on the outer side of the limit ring 228 and is fixedly connected to the limit ring 228. The limit ring 228 is limited in the second direction. Optionally, the limit ring 228 is fixedly connected to the paddle clamp 300 by a plurality of screws arranged at intervals in the circumferential direction.

[0048] It can be understood that when the paddle clamp 300 is sleeved on the horizontal axis 223, it is necessary to limit the paddle clamp 300 in the axial direction of the horizontal axis 223 (i.e., the second direction) on the premise of ensuring that the paddle clamp 300 can rotate, so that the paddle clamp 300 will not fall off the horizontal axis 223. By setting the limit ring 228 and fixedly connecting the limit ring 228 to the paddle clamp 300, and restricting the position of the limit ring 228 in the axial direction of the horizontal axis 223, the position of the paddle clamp 300 in the second direction can be restricted.

[0049] Specifically, the horizontal axis assembly 220 further includes a limiting member 225 and a bearing 226. The connecting portion 222 and the limiting member 225 are spaced apart in the second direction. The bearing 226 is sleeved on the horizontal axis 223. The outer peripheral surface of the bearing 226 is used to abut against the paddle clamp 300. The bearing 226 and the limit ring 228 are arranged in the second direction. Both the bearing 226 and the limit ring 228 are located between the connecting portion 222 and the limiting member 225. The limiting member 225 is used to prevent the bearing 226 and the limit ring 228 from moving away from the connecting portion 222. In this embodiment, the bearing 226 supports the paddle clamp 300 in the radial direction. Therefore, the position of the paddle clamp 300 relative to the horizontal axis 223 in the radial direction is positioned by the bearing 226. Optionally, there is a gap between the inner ring of the limit ring 228 and the horizontal axis 223, which can eliminate the sliding friction between the limit ring 228 and the horizontal axis 223 and make the rotation of the paddle clamp 300 relative to the horizontal axis 223 smoother. In this embodiment, the horizontal axis 223 is a stepped shaft, and a step surface 224 perpendicular to the axis of the horizontal axis 223 is provided on the horizontal axis 223. The step surface 224 faces the limiting member 225. The limit ring 228 and the bearing 226 are arranged between the step surface 224 and the limiting member 225 and are abutted and limited by the step surface 224 and the limiting member 225. Therefore, the limit ring 228 and the bearing 226 cannot move in the axial direction of the horizontal axis 223.

[0050] Furthermore, the horizontal axis assembly 220 further includes a limit bolt 227. The limit bolt 227 penetrates the horizontal axis member 221 in the second direction and is coaxially arranged with the horizontal axis 223. The front end of the limit bolt 227 extends from the end of the horizontal axis 223 away from the connecting portion 222 and is threadedly connected to the limiting member 225. The limiting member 225 abuts against the end of the horizontal axis 223 away from the connecting portion 222. As Figure 5 andFigure 6 As shown, an assembly hole 2211 matching the limit bolt 227 is provided on the horizontal shaft member 221. The assembly hole 2211 is a through hole, and the assembly hole 2211 penetrates from the side of the connecting portion 222 toward the hub 100 to the end of the horizontal shaft 223 away from the connecting portion 222. By providing the limit bolt 227, the position of the limiting member 225 is fixed; in other embodiments, the limiting member 225 can also be directly threadedly connected to the horizontal shaft 223.

[0051] In this embodiment, three bearings 226 are sleeved on the horizontal shaft 223. There is one bearing 226 between the limit ring 228 and the step surface 224, and two bearings 226 are provided between the limit ring 228 and the limiting member 225. The two ends of the limit ring 228 in the axial direction respectively abut against the outer rings of the two bearings 226, so it can rotate synchronously with the outer rings of the bearings 226. Optionally, the bearing 226 is a deep groove ball bearing. In other alternative embodiments, the number of bearings 226 sleeved on the horizontal shaft 223 can be increased or decreased as needed.

[0052] Figure 7 Schematic diagram of a paddle clip 300 in an embodiment of the present application. As Figure 6 and Figure 7 shown, in the embodiment of the present application, one of the paddle clip 300 and the connecting mechanism 200 is provided with a limit groove 2221, and the other of the paddle clip 300 and the connecting mechanism 200 is provided with a limit protrusion 311. The limit protrusion 311 is inserted into the limit groove 2221 to limit the rotation stroke interval of the paddle clip 300 relative to the horizontal shaft 223. In this embodiment, the limit groove 2221 is provided on the horizontal shaft assembly 220. Specifically, the limit groove 2221 is provided on the connecting portion 222 of the horizontal shaft member 221, and the limit protrusion 311 is provided at the end of the paddle clip 300; in other embodiments, the limit groove 2221 can also be provided at the end of the paddle clip 300, and the limit protrusion 311 is provided on the connecting portion 222. Since the limit protrusion 311 can only move within the limit groove 2221, even if the paddle clip 300 loses the control of the adjusting transmission mechanism 400, the paddle clip 300 can only rotate relative to the horizontal shaft 223 within a specific rotation stroke interval and will not rotate arbitrarily. Such a setting can ensure that the paddle clip 300 will not rotate excessively after losing control, resulting in abnormal deflection of the paddle blade, thereby ensuring the safety of the helicopter. It should be understood that the size of the limit groove 2221 should be reasonably designed, which not only needs to ensure that the paddle clip 300 has enough rotation stroke for adjustment, but also ensures that the paddle clip 300 can be restricted by the limit groove 2221 after losing control, so that it will not rotate excessively.

[0053] Specifically, the paddle clip 300 includes a socket part 310 and a mounting part 320 connected to the socket part 310. The socket part 310 is a cylindrical structure for sleeving on the cross shaft 223 of the cross shaft member 221; the mounting part 320 is connected to one end of the socket part 310 in the axial direction for mounting the paddle blade. The limiting protrusion 311 (or the limiting groove 2221) is arranged on the end face of the socket part 310 away from the mounting part 320.

[0054] Further, two limiting grooves 2221 are arranged on the side of the connecting part 222 facing the paddle clip 300, and the two limiting grooves 2221 are spaced apart in the axial direction of the hub 100, and the cross shaft 223 is arranged between the two limiting grooves 2221. It can be understood that in a tandem rotor helicopter, the rotation directions of the front propeller and the rear propeller are different, so the setting positions of the limiting groove 2221 and the limiting protrusion 311 are different. Figure 7 In the paddle clip 300 in the embodiment, it can be applied to the front propeller, and the limiting protrusion 311 arranged thereon is below the cross shaft 223 (that is, on the side close to the helicopter fuselage); while the limiting protrusion 311 on the paddle clip 300 of the rear propeller can be located above the cross shaft 223. Then, in order to improve the versatility of the cross shaft member 221, two limiting grooves 2221 are arranged on the connecting part 222, and the two limiting grooves 2221 are respectively located on the upper side and the lower side of the cross shaft 223. With this setting, whether it is arranged on the front propeller or the rear propeller, the cross shaft member 221 can be matched with the corresponding paddle clip 300. In other embodiments, only one limiting groove 2221 can also be arranged on the connecting part 222 of the cross shaft member 221 according to the paddle clip 300 to be matched.

[0055] In this embodiment, the middle connecting plate 210 is rotatably connected to the hub 100 and the rotation axis is parallel to the first direction. A relief groove 2222 is arranged on the side of the connecting part 222 facing the hub 100, and the relief groove 2222 is used to avoid the main rotor shaft. In this embodiment, the middle connecting plate 210 has a certain degree of rotational freedom relative to the hub 100. After the hub 100 rotates around its own axis, under the lift of the paddle blade, the middle connecting plate 210 and the paddle clip 300 can adaptively adjust their postures relative to the hub 100 to achieve smooth rotation. Therefore, it can avoid the problem of unsmooth rotation that may be caused when the hub 100 is locked with the middle connecting plate 210. By arranging the relief groove 2222, the mutual interference between the main rotor shaft and the connecting part 222 can be reduced, and the rotation range of the connecting part 222 following the middle connecting plate 210 can be increased.

[0056] Figure 8 Schematic diagram of the adjusting transmission mechanism 400 in an embodiment of the present application; Figure 9 Schematic diagram of the rocker arm 410 in an embodiment of the present application. As Figure 8 and Figure 9As shown in the figure, the adjustment drive mechanism 400 of the embodiment of the present application includes a rocker arm 410 and a pitch change pull rod 420. The rocker arm 410 is connected to the blade grip 300, and the pitch change pull rod 420 is connected to the rocker arm 410. The pitch change pull rod 420 is used to drive the rocker arm 410 to rotate relative to the transverse axis 223. In this embodiment, one end of the pitch change pull rod 420 is connected to the rocker arm 410 and can rotate relative to the rocker arm 410. The other end of the pitch change pull rod 420 is used for driving connection with an adjustment drive mechanism (not shown in the figure) of the helicopter. The adjustment drive mechanism can drive the pitch change pull rod 420 to drive the rocker arm 410 to move, and then drive the blade grip 300 to rotate.

[0057] In this embodiment, the rocker arm 410 is a plate-like structure and is parallel to the third direction. The end of the pitch change pull rod 420 is connected to one side of the rocker arm 410 in the third direction; wherein, the third direction is parallel to the axis direction of the hub 100 and is perpendicular to the first direction and the second direction. It can be seen Figure 1 from this that the pitch change pull rod 420 can drive the blade grip 300 to rotate by pushing and pulling the rocker arm 410 along the third direction. In this embodiment, by setting the rocker arm 410 as a plate-like structure parallel to the third direction and connecting the pitch change pull rod 420 to one side of the rocker arm 410 in the third direction, when the rocker arm 410 is subjected to the force of the pitch change pull rod 420, it is not easy to bend and deform. Therefore, it can not only increase the reliability of the adjustment drive mechanism 400, but also improve the control accuracy when adjusting the rotation of the blade grip 300.

[0058] In this embodiment, one end of the pitch change pull rod 420 is connected to the rocker arm 410 through a spherical rod end joint bearing 430. By connecting the pitch change pull rod 420 and the rocker arm 410 through the spherical rod end joint bearing 430, the pitch change pull rod 420 has a higher rotational freedom, so that problems such as self-locking will not occur when pushing and pulling the rocker arm 410.

[0059] Specifically, an assembly groove 411 is provided on one side of the rocker arm 410 in the third direction, and at least part of the spherical rod end joint bearing 430 is accommodated in the assembly groove 411. With this setting, the spherical rod end joint bearing 430 has better reliability.

[0060] In this embodiment, a positioning boss 412 and two mating holes 413 are provided at one end of the rocker arm 410 away from the assembly groove 411. The two mating holes 413 are spaced in the third direction, and the positioning boss 412 is provided between the two mating holes 413. Correspondingly, a positioning groove 312 and two mounting screw holes 313 are provided on the paddle clip 300. The two mounting screw holes 313 are spaced in the third direction, and the positioning groove 312 is provided between the two mounting screw holes 313. The rocker arm 410 is fixedly connected to the paddle clip 300 through the cooperation of screws, the mating holes 413 and the mounting screw holes 313. The positioning groove 312 is used for plug-in cooperation with the positioning boss 412, which can not only realize the pre-positioning of the rocker arm 410 during installation, but also improve the structural stability of the rocker arm 410 after being installed on the paddle clip 300.

[0061] In this embodiment, the rotor head includes two paddle clips 300 and two adjustment transmission mechanisms 400. The two adjustment transmission mechanisms 400 are respectively connected to the two paddle clips 300, and the rocker arms 410 of the two adjustment transmission mechanisms 400 are respectively located on the opposite sides of the hub 100 in its radial direction. Such an arrangement makes the center of gravity of the entire rotor head closer to the rotation axis of the hub 100, making the rotor head more stable during rotation. Optionally, the two adjustment transmission mechanisms 400 are arranged symmetrically about the rotation axis of the hub 100.

[0062] The embodiment of the present application also provides a helicopter (not shown in the figure), which includes a rotor main shaft, a blade, an adjustment driving mechanism, and the rotor head provided in the above embodiment of the present application. The hub 100 is sleeved on the rotor main shaft, the blade is connected to the paddle clip 300, and the adjustment driving mechanism is in transmission connection with the adjustment transmission mechanism 400 of the rotor head. The adjustment driving mechanism is used to drive the paddle clip 300 to rotate around the transverse axis 223. The helicopter in the embodiment of the present application can be an unmanned helicopter, such as a tandem dual-rotor unmanned helicopter; it can also be a helicopter that requires a pilot to drive.

[0063] In summary, the embodiments of the present application provide a rotor head and a helicopter. The rotor head includes a hub 100, a connecting mechanism 200, blade grips 300, and an adjusting transmission mechanism 400. The hub 100 is used to be sleeved on the rotor main shaft of the helicopter. The connecting mechanism 200 is connected to the hub 100. The connecting mechanism 200 includes a transverse shaft 223. The blade grips 300 are rotatably sleeved on the transverse shaft 223. The blade grips 300 are used to connect the blades. The adjusting transmission mechanism 400 is drivingly connected to the blade grips 300. The adjusting transmission mechanism 400 is used to drive the blade grips 300 to rotate relative to the transverse shaft 223. One of the blade grips 300 and the connecting mechanism 200 is provided with a limiting groove 2221, and the other of the blade grips 300 and the connecting mechanism 200 is provided with a limiting protrusion 311. The limiting protrusion 311 is inserted into the limiting groove 2221 to define the rotation stroke interval of the blade grips 300 relative to the transverse shaft 223. By providing the limiting protrusion 311 and the limiting groove 2221 on the blade grips 300 and the connecting mechanism 200, the limiting protrusion 311 is restricted and can only move within the limiting groove 2221. Such a setting makes it so that even if the adjusting transmission mechanism 400 is damaged and loses control of the rotation of the blade grips 300, the blade grips 300 will not rotate arbitrarily at a large angle, but will remain within a certain rotation stroke interval. Therefore, the risk of the helicopter losing control and crashing can be reduced, and the safety of the helicopter can be improved.

[0064] The helicopter provided by the embodiments of the present application includes a rotor main shaft, blades, an adjusting drive mechanism, and the above-mentioned rotor head. Since the blade grips 300 will also be restricted and will not rotate arbitrarily at a large angle after losing control, the helicopter has a high safety.

[0065] As described above, the above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered by 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 rotor head, applied to a helicopter, characterized in that: The rotor head includes a hub, a connecting mechanism, a propeller clamp and an adjusting transmission mechanism, the hub is used to be mounted on the rotor main shaft of the helicopter, the connecting mechanism is connected to the hub, the connecting mechanism includes a transverse axis, the propeller clamp is rotatably mounted on the transverse axis, the propeller clamp is used to connect the blades, the adjusting transmission mechanism is connected to the propeller clamp, the adjusting transmission mechanism is used to drive the propeller clamp to rotate relative to the transverse axis, the propeller clamp and one of the connecting mechanism are provided with a limiting groove, the propeller clamp and the other of the connecting mechanism are provided with a limiting protrusion, the limiting protrusion is inserted into the limiting groove to limit the rotation stroke range of the propeller clamp relative to the transverse axis.

2. The rotor head according to claim 1, characterized in that: The connecting mechanism includes a center connecting plate assembly and two transverse axis assemblies, the center connecting plate assembly includes two center connecting plates, the two center connecting plates are respectively connected to the two opposite sides of the hub in a first direction, the two transverse axis assemblies are spaced apart in a second direction, and the first direction is perpendicular to the second direction; the limiting groove is arranged on the transverse axis assembly, and the limiting protrusion is arranged at the end of the propeller clamp.

3. The rotor head according to claim 2, characterized in that: The transverse axis assembly includes a transverse axis member, and the transverse axis member includes a connecting portion and the transverse axis. The connecting portion is connected to the two center connecting plates, and the transverse axis is connected to the connecting portion and extends along the second direction. The limiting groove is arranged on the connecting portion of the transverse axis member.

4. The rotor head according to claim 3, characterized in that: The transverse axis assembly also includes a limiting ring, which is sleeved on the transverse axis and can rotate relative to the transverse axis. The paddle clamp is sleeved on the outside of the limiting ring and fixedly connected to the limiting ring. The limiting ring is limited in the second direction.

5. The rotor head according to claim 4, characterized in that: The transverse axis assembly also includes a limit piece and a bearing, the connecting portion and the limit piece are spaced apart in the second direction, the bearing is sleeved on the transverse axis, the outer peripheral surface of the bearing is used to abut the paddle clamp, the bearing and the limit ring are arranged in the second direction, the bearing and the limit ring are both located between the connecting portion and the limit piece, and the limit piece is used to prevent the bearing and the limit ring from moving in a direction away from the connecting portion.

6. The rotor head according to claim 5, characterized in that: The transverse axis assembly also includes a limiting bolt, which passes through the transverse axis member along the second direction and is coaxially arranged with the transverse axis. The front end of the limiting bolt extends from an end of the transverse axis away from the connecting portion and is threadedly connected to the limiting member. The limiting member abuts against an end of the transverse axis away from the connecting portion.

7. The rotor head according to claim 3, characterized in that: Two limiting grooves are arranged on one side of the connecting portion facing the propeller clamp, the two limiting grooves are spaced apart in the extending direction of the axis of the propeller hub, and the transverse axis is arranged between the two limiting grooves.

8. The rotor head according to claim 3, characterized in that: The center connecting plate is rotatably connected to the hub and the rotation axis is parallel to the first direction. A avoidance groove is provided on the side of the connecting portion facing the hub, and the avoidance groove is used to avoid the rotor main shaft.

9. The rotor head according to claim 3, characterized in that: The paddle clamp includes a sleeve portion and a mounting portion connected to the sleeve portion, the sleeve portion is used to be sleeved on the transverse axis of the transverse axis member, the mounting portion is connected to one axial end of the sleeve portion, and the mounting portion is used to mount a paddle blade; the limiting protrusion is arranged on the end surface of the sleeve portion away from the mounting portion.

10. The rotor head according to any one of claims 1 to 9, characterized in that: The regulating transmission mechanism comprises a rocker arm and a pitch-changing rod, wherein the rocker arm is connected to the propeller clamp, the pitch-changing rod is connected to the rocker arm, and the pitch-changing rod is used to drive the rocker arm to rotate relative to the transverse axis.

11. The rotor head according to claim 10, characterized in that: The rocker arm is a plate-like structure and is parallel to a third direction, and an end of the variable pitch pull rod is connected to one side of the rocker arm in the third direction; wherein the third direction is parallel to the axial direction of the hub.

12. The rotor head according to claim 11, characterized in that: One end of the variable pitch pull rod is connected to the rocker arm through a fisheye rod end joint bearing.

13. The rotor head according to claim 12, characterized in that: The rocker arm is provided with an assembly groove on one side in the third direction, and at least a part of the fisheye rod end joint bearing is accommodated in the assembly groove.

14. The rotor head according to claim 10, characterized in that: The rotor head includes two propeller clamps and two adjusting transmission mechanisms, the two adjusting transmission mechanisms are respectively connected to the two propeller clamps, and the rocker arms of the two adjusting transmission mechanisms are respectively located on opposite sides of the propeller hub in the radial direction.

15. A helicopter, characterized in that: It comprises a rotor main shaft, blades, an adjustment drive mechanism and a rotor head according to any one of claims 1 to 14, wherein the hub is sleeved on the rotor main shaft, the blades are connected to the propeller clamps of the rotor head, the adjustment drive mechanism is transmission-connected to the adjustment transmission mechanism of the rotor head, and the adjustment drive mechanism is used to drive the propeller clamps to rotate around the horizontal axis.

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