Helicopter main rotor suspension stop

Abstract

The application relates to the technical field of overhang limiters, and discloses a helicopter main rotor overhang limiter, which comprises a synchronous ring, a connecting mechanism and a fixing mechanism, the synchronous ring is arranged on the fixing mechanism, the connecting mechanism is arranged on the synchronous ring, the connecting mechanism comprises a plunger body and a clamping groove, and the clamping groove is arranged at the rear end of the plunger body. The helicopter main rotor overhang limiter is installed on the lower supporting plate of the main rotor hub through the plunger body, four plunger bodies are connected through a suspended synchronous ring, the installation mode provides the downward stop limit of the main rotor blade, secondly, the eccentricity of the four plunger bodies is designed to be consistent with the rotating direction of the main rotor blade in the working rotation process, therefore, in the working rotation process of the blade, the overhang limiter can generate a favorable rotating torque, the torque can effectively inhibit the up-and-down flutter of the blade, and the blade can maintain a more stable state under the condition of speed change.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of suspension limiters, in particular to a helicopter main rotor suspension limiter. BACKGROUND

[0002] The rotor is an important component of the helicopter. During the flight of the helicopter, the rotor plays a dual role of generating lift and drag. Moreover, the rotor also plays a role similar to the aileron and elevator of the airplane. There are various types of rotors, mainly including four types: articulated rotor, hingeless rotor, semi-hinged rotor and bearingless rotor. During the design of the helicopter main rotor system, a blade stop device that meets the design requirements must be provided to limit the travel of the blade around its hinge.

[0003] At present, during the flight of the helicopter, the power provided by the engine may be discontinuous, which may cause a large change in the rotational speed of the blade, and the lift generated by the blade may have a large change in amplitude, and the blade may have a violent up-and-down vibration, which greatly affects the stability of the helicopter flight. Therefore, the helicopter main rotor suspension limiter is proposed to solve the above problems. SUMMARY

[0004] (I) Technical problems to be solved

[0005] In view of the deficiencies in the prior art, the present application provides a helicopter main rotor suspension limiter.

[0006] (II) Technical solutions

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a helicopter main rotor suspension limiter, comprising a synchronization ring, a connecting mechanism and a fixing mechanism, the synchronization ring is arranged on the fixing mechanism, and the connecting mechanism is arranged on the synchronization ring.

[0008] The connecting mechanism comprises a plunger body and a clamping groove, the clamping groove is opened at the rear end of the plunger body, the inner wall of the clamping groove is fixedly connected with a limiting block, an outer cylinder is fixedly installed on the plunger body, the outer wall of the outer cylinder is fixedly connected with a mounting plate, the front end of the plunger body is fixedly connected with a first connecting plate, a first mounting hole is opened in the first connecting plate, an adjusting seat is arranged on the plunger body, and the front surface of the adjusting seat is fixedly connected with a second connecting plate.

[0009] The fixing mechanism comprises a fixing seat and a fixing groove, the fixing groove is opened on the outer wall of the fixing seat, and the synchronization ring is fixedly installed in the inside of the fixing groove.

[0010] The four plunger bodies are installed on the lower supporting plate of the main rotor hub through a plunger body, and the four plunger bodies are connected through a suspended synchronous ring, which provides the downward stop limit of the main rotor blade. In addition, the eccentricity of the four plunger bodies is designed to be consistent with the rotation direction of the main rotor blade in the working rotation process. Therefore, during the working rotation of the blade, the overhanging limiter can generate a favorable rotating torque, which can effectively suppress the up-down flutter of the blade, so that the blade can maintain a more stable state under the condition of speed change.

[0011] Preferably, the upper surface of the adjusting seat is provided with a second through hole, the plunger body is provided with a first through hole, the first through hole and the second through hole are inserted with a fastening bolt, the lower end of the fastening bolt is threadedly connected with a nut, and the first connecting plate and the second connecting plate can be conveniently butt-jointed with the connecting piece on the hub through the arrangement of the fastening bolt and the nut.

[0012] Preferably, the upper surface of the second connecting plate is provided with a second mounting hole, and the number of the limiting blocks is two, and the two limiting blocks are fixedly connected to the inner top wall and the inner bottom wall of the clamping groove respectively. Through the arrangement of the second mounting hole, the second connecting plate can be conveniently fixedly installed on the lower supporting plate of the hub through a bolt.

[0013] Preferably, the synchronous ring is provided with an annular groove, and the number of the annular grooves is two, and the two annular grooves are arranged on the upper surface and the bottom of the synchronous ring respectively, and the limiting blocks are inserted into the annular grooves. Through the arrangement of the annular groove, the plunger body can be conveniently limited and guided.

[0014] Preferably, the upper surface of the mounting plate is provided with a third mounting hole, and the upper surface of the mounting plate is bonded with a rubber pad. Through the arrangement of the rubber pad, the friction between the mounting plate and the lower supporting plate of the hub can be improved, and the firmness and stability during installation can be improved.

[0015] Preferably, the number of the plunger bodies is four, the four plunger bodies are arranged on the synchronous ring with the center of the synchronous ring as the center and at equal intervals, the upper surface of the rubber pad is provided with a fastening hole, and the fastening hole is located directly above the third mounting hole. The third mounting hole can conveniently enable the mounting plate to be installed on the lower supporting plate of the hub through a bolt.

[0016] Preferably, the upper surface of the fixing seat is fixedly provided with a first limiting ring, the inner diameter of the first limiting ring is larger than the inner diameter of the fixing seat, and the inner wall of the first limiting ring is bonded with a first anti-skid ring. Through the arrangement of the first limiting ring and the first anti-skid ring, the fixing seat can be conveniently installed on the main shaft.

[0017] Preferably, the bottom of the fixing seat is fixedly provided with a second limiting ring, the inner diameter of the second limiting ring is larger than the inner diameter of the fixing seat, and the inner wall of the second limiting ring is bonded with a second anti-skid ring.

[0018] (III) Beneficial Effects

[0019] Compared with the prior art, the helicopter main rotor suspension limiter has the following beneficial effects:

[0020] 1. The helicopter main rotor suspension limiter is installed on the lower supporting plate of the main rotor hub through the plunger bodies, and the four plunger bodies are connected through a suspended synchronous ring. This installation mode provides downward stop limit for the main rotor blade. In addition, the eccentricity of the four plunger bodies is designed to be consistent with the rotation direction of the main rotor blade in the working rotation process. Therefore, in the working rotation process of the blade, the suspension limiter can generate a favorable rotating torque, which can effectively suppress the up-down flutter of the blade, so that the blade can maintain a more stable state under the condition of speed change.

[0021] 2. The helicopter main rotor suspension limiter is adjusted by rotating the nut to move the nut away from the bottom of the plunger body, so that the adjusting seat can be moved upward along the fastening bolt, and the spacing between the first connecting plate and the second connecting plate is adjusted. Different thicknesses of hub connecting pieces can be inserted between the first connecting plate and the second connecting plate for fastening bolt fixation, avoiding gaps during butt joint, and improving the stability of the plunger body after installation.

[0022] 3. The helicopter main rotor suspension limiter is provided with a limiting ring and an anti-skid ring on the fixing seat, which can make the fixing seat more stable and firm when installed on the main shaft. The first anti-skid ring and the second anti-skid ring can improve the friction force of contact with the main shaft, avoid displacement of the fixing seat, and improve the stability of the suspension limiter during use. DETAILED DESCRIPTION

[0023] The accompanying drawings are included to provide a further understanding of the application, and constitute a part of the specification, illustrate the application, and are used to explain the application without limiting the application. In the drawings:

[0024] Figure 1 is a structural schematic diagram of the application;

[0025] Figure 2 is a bottom structure schematic diagram of the application;

[0026] Figure 3 is a whole structure schematic diagram of the application;

[0027] Figure 4 This is a schematic diagram of the synchronization ring structure of the present invention;

[0028] Figure 5 This is a schematic diagram of the outer cylinder structure of the present invention;

[0029] Figure 6 This is a schematic diagram of the plunger structure of the present invention;

[0030] Figure 7 This is a schematic diagram of the first through-hole structure of the present invention;

[0031] Figure 8 This is a schematic diagram of the fixing base structure of the present invention.

[0032] In the diagram: 1. Synchronization ring; 2. Connecting mechanism; 201. Piston body; 202. Slot; 203. Limiting block; 204. Outer cylinder; 205. Mounting plate; 206. First connecting plate; 207. First mounting hole; 208. Adjusting seat; 209. First through hole; 210. Second through hole; 211. Second connecting plate; 212. Second mounting hole; 3. Fixing mechanism; 301. Fixing seat; 302. Fixing groove; 303. First limiting ring; 304. First anti-slip ring; 305. Second limiting ring; 306. Second anti-slip ring; 4. Fastening bolt; 5. Nut; 6. Rubber pad; 7. Third mounting hole; 8. Annular groove. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0034] Example 1

[0035] like Figures 1-8 As shown, the present invention provides a helicopter main rotor suspension limiter, including a synchronization ring 1, a connecting mechanism 2 and a fixing mechanism 3. The synchronization ring 1 is disposed on the fixing mechanism 3, and the connecting mechanism 2 is disposed on the synchronization ring 1.

[0036] The connecting mechanism 2 comprises a plunger body 201 and a clamping groove 202, the clamping groove 202 is arranged at the rear end of the plunger body 201, the inner wall of the clamping groove 202 is fixedly connected with a limiting block 203, the plunger body 201 is fixedly installed with an outer cylinder 204, the outer wall of the outer cylinder 204 is fixedly connected with a mounting plate 205, the front end of the plunger body 201 is fixedly connected with a first connecting plate 206, the first connecting plate 206 is provided with a first mounting hole 207, the plunger body 201 is provided with an adjusting seat 208, the front surface of the adjusting seat 208 is fixedly connected with a second connecting plate 211, the plunger body 201 is installed on the lower supporting plate of the main rotor hub through the adjusting seat 208, four plunger bodies 201 are connected through a suspended synchronous ring 1, this installation mode provides the downward stop limit of the main rotor blade, secondly, the eccentric distance of the four plunger bodies 201 is designed to be consistent with the rotation direction of the main rotor blade in the working rotation process, therefore, in the working rotation process of the blade, the overhanging limiter can generate a favorable rotation torque, the torque can effectively inhibit the up and down flutter of the blade, so that the blade can maintain a more stable state under the condition of speed change, the nut 5 is moved away from the bottom of the plunger body 201 by rotating the nut 5 by the staff, at this time, the adjusting seat 208 can be moved upwards along the fastening bolt 4, so that the distance between the first connecting plate 206 and the second connecting plate 211 is adjusted, the connecting piece of the hub with different thicknesses can be conveniently inserted between the first connecting plate 206 and the second connecting plate 211, and the fastening bolt is fixed, so that the gap during butt joint is avoided, and the stability after installation of the plunger body 201 is improved.

[0037] The fixing mechanism 3 comprises a fixing seat 301 and a fixing groove 302, the fixing groove 302 is arranged on the outer wall of the fixing seat 301, and the synchronous ring 1 is fixedly installed in the fixing groove 302.

[0038] The upper surface of the adjusting seat 208 is provided with a second through hole 210, the plunger body 201 is provided with a first through hole 209, the first through hole 209 and the second through hole 210 are inserted with a fastening bolt 4, the lower end of the fastening bolt 4 is threadedly connected with a nut 5, through the arrangement of the fastening bolt 4 and the nut 5, the first connecting plate 206 and the second connecting plate 211 can be conveniently butt jointed with the connecting piece on the hub.

[0039] The upper surface of the second connecting plate 211 is provided with a second mounting hole 212, the number of the limiting blocks 203 is two, the two limiting blocks 203 are fixedly connected with the inner top wall and the inner bottom wall of the clamping groove 202 respectively, through the arrangement of the second mounting hole 212, the second connecting plate 211 can be fixedly installed on the lower supporting plate of the hub through the bolt.

[0040] The synchronizing ring 1 has two annular grooves 8, which are respectively opened on the upper surface and bottom of the synchronizing ring 1. The limiting block 203 is inserted into the inside of the annular groove 8. The annular groove 8 can conveniently limit and guide the plunger body 201.

[0041] The upper surface of the mounting plate 205 has a third mounting hole 7, and a rubber pad 6 is bonded to the upper surface of the mounting plate 205. The rubber pad 6 can increase the friction between the mounting plate 205 and the propeller hub support plate, thereby improving the firmness and stability during installation.

[0042] There are four plunger bodies 201. The four plunger bodies 201 are arranged at equal intervals on the synchronous ring 1 with the center of the synchronous ring 1 as the center. The upper surface of the rubber pad 6 is provided with a fastening hole, which is located directly above the third mounting hole 7. The setting of the third mounting hole 7 allows the mounting plate 205 to be installed on the propeller hub lower support plate by bolts.

[0043] In this embodiment, the plunger bodies 201 are installed on the lower support plate of the main rotor hub. The four plunger bodies 201 are connected by a suspended synchronization ring 1. This installation method provides downward stop restriction for the main rotor blades. Secondly, the eccentricity design of the four plunger bodies 201 is consistent with the rotation direction of the main rotor blades during operation. Therefore, during the blade rotation, the suspension limiter can generate a favorable rotational torque, which can effectively suppress the up-and-down flutter of the blades, so that the blades can maintain a more stable state when the speed changes. By rotating the nut 5, the operator moves the nut 5 away from the bottom of the plunger body 201. At this time, the adjusting seat 208 can move upward along the fastening bolt 4, thereby adjusting the distance between the first connecting plate 206 and the second connecting plate 211. It is convenient to insert hub connecting parts of different thicknesses between the first connecting plate 206 and the second connecting plate 211 for fixing with bolts, avoiding gaps during docking and improving the stability of the plunger bodies 201 after installation.

[0044] Example 2

[0045] like Figures 1-8 As shown, based on Embodiment 1, the present invention provides a technical solution: a first limiting ring 303 is fixedly installed on the upper surface of the fixed seat 301. The inner diameter of the first limiting ring 303 is larger than the inner diameter of the fixed seat 301. A first anti-slip ring 304 is bonded to the inner wall of the first limiting ring 303. The fixed seat 301 can be conveniently installed on the spindle by setting the first limiting ring 303 and the first anti-slip ring 304.

[0046] The bottom of the fixing seat 301 is fixedly provided with a second limiting ring 305, the inner diameter of the second limiting ring 305 is larger than the inner diameter of the fixing seat 301, the inner wall of the second limiting ring 305 is bonded with a second anti-skid ring 306, and the second limiting ring 305 and the second anti-skid ring 306 are arranged to facilitate the installation of the fixing seat 301 on the main shaft.

[0047] In the embodiment, the fixing seat 301 is more stable and firm in installation on the main shaft through the arrangement of the limiting ring and the anti-skid ring on the fixing seat 301, the first anti-skid ring 304 and the second anti-skid ring 306 are arranged to improve the friction force in contact with the main shaft, the displacement of the fixing seat 301 is avoided, and the stability of the suspension limiter in use is improved.

[0048] The working principle of the helicopter main rotor suspension limiter will be described below.

[0049] As shown in Figures 1-8 the drawings, the plunger body 201 is installed on the lower supporting plate of the main rotor hub in use, the four plunger bodies 201 are connected through a suspended synchronous ring 1, the installation mode provides the downward stop limit of the main rotor blade, secondly, the eccentricity of the four plunger bodies 201 is designed to be consistent with the rotation direction of the main rotor blade in the working rotation process, therefore, in the working rotation process of the blade, the suspension limiter can generate a favorable rotation torque, the torque can effectively inhibit the up and down flutter of the blade, the blade can maintain a more stable state under the condition of speed change, the nut 5 is moved away from the bottom of the plunger body 201 by rotating the nut 5 by the worker, at this time, the adjusting seat 208 can be moved upward along the fastening bolt 4, and the spacing between the first connecting plate 206 and the second connecting plate 211 is adjusted, the hub connecting piece with different thicknesses can be conveniently inserted between the first connecting plate 206 and the second connecting plate 211, and the fastening bolt is fixed, the gap in the butt joint is avoided, and the stability after the installation of the plunger body 201 is improved; the fixing seat 301 is more stable and firm in installation on the main shaft through the arrangement of the limiting ring and the anti-skid ring on the fixing seat 301, the first anti-skid ring 304 and the second anti-skid ring 306 are arranged to improve the friction force in contact with the main shaft, the displacement of the fixing seat 301 is avoided, and the stability of the suspension limiter in use is improved.

Claims

1. A helicopter main rotor suspension limiter, comprising a synchronizing ring (1), a connecting mechanism (2), and a fixing mechanism (3), characterized in that: The synchronization ring (1) is mounted on the fixing mechanism (3), and the connecting mechanism (2) is mounted on the synchronization ring (1); The connecting mechanism (2) includes a plunger body (201) and a slot (202). The slot (202) is located at the rear end of the plunger body (201). A limit block (203) is fixedly connected to the inner wall of the slot (202). An outer cylinder (204) is fixedly installed on the plunger body (201). An installation plate (205) is fixedly connected to the outer wall of the outer cylinder (204). A first connecting plate (206) is fixedly connected to the front end of the plunger body (201). A first installation hole (207) is provided on the first connecting plate (206). An adjusting seat (208) is provided on the plunger body (201). A second connecting plate (211) is fixedly connected to the front side of the adjusting seat (208). The fixing mechanism (3) includes a fixing seat (301) and a fixing groove (302). The fixing groove (302) is opened on the outer wall of the fixing seat (301), and the synchronizing ring (1) is fixedly installed inside the fixing groove (302). The synchronization ring (1) has an annular groove (8) with two grooves. The two grooves (8) are respectively located on the upper surface and bottom of the synchronization ring (1). The limiting block (203) is inserted into the inside of the annular groove (8).

2. The helicopter main rotor suspension limiter according to claim 1, characterized in that: The upper surface of the adjusting seat (208) is provided with a second through hole (210), and the plunger body (201) is provided with a first through hole (209). Fastening bolts (4) are inserted into the first through hole (209) and the second through hole (210), and a nut (5) is threaded to the lower end of the fastening bolt (4).

3. The helicopter main rotor suspension limiter according to claim 1, characterized in that: The upper surface of the second connecting plate (211) is provided with a second mounting hole (212), and there are two limiting blocks (203). The two limiting blocks (203) are respectively fixedly connected to the inner top wall and the inner bottom wall of the slot (202).

4. A helicopter main rotor suspension limiter according to claim 1, characterized in that: The upper surface of the mounting plate (205) is provided with a third mounting hole (7), and a rubber pad (6) is adhered to the upper surface of the mounting plate (205).

5. A helicopter main rotor suspension limiter according to claim 4, characterized in that: The number of plungers (201) is four. The four plungers (201) are arranged at equal intervals on the synchronous ring (1) with the center of the synchronous ring (1) as the center. The upper surface of the rubber pad (6) is provided with fastening holes, which are located directly above the third mounting hole (7).

6. A helicopter main rotor suspension limiter according to claim 1, characterized in that: A first limiting ring (303) is fixedly installed on the upper surface of the fixed base (301). The inner diameter of the first limiting ring (303) is larger than the inner diameter of the fixed base (301). A first anti-slip ring (304) is bonded to the inner wall of the first limiting ring (303).

7. A helicopter main rotor suspension limiter according to claim 1, characterized in that: A second limiting ring (305) is fixedly installed at the bottom of the fixed base (301). The inner diameter of the second limiting ring (305) is larger than the inner diameter of the fixed base (301). A second anti-slip ring (306) is bonded to the inner wall of the second limiting ring (305).

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