Transmission mechanism of oil-driven unmanned helicopter

Abstract

The utility model discloses an oil-driven unmanned helicopter transmission mechanism which comprises a rack and a reduction gearbox, a main transmission shaft is installed on the top of the reduction gearbox, four L-shaped pressure cylinders are installed on the rack and located at the four corners of the reduction gearbox, gaps for side transmission shafts to penetrate through are reserved between the adjacent L-shaped pressure cylinders, and the side transmission shafts are located in the gaps. Pressure plates are slidably connected into the two right-angle sides of the L-shaped pressure cylinder and matched with the reduction gearbox. The device further comprises a bottom plate and a movable plate, and the bottom plate is in threaded connection with a plurality of bolts. Through the arrangement of the L-shaped pressure cylinder, when the reduction gearbox vibrates to slide towards one side, the pressure plate on the side of the L-shaped pressure cylinder can be popped out through pressure generated on the pressure plate, so that the friction force on the reduction gearbox is increased, and the vibration effect of the reduction gearbox is reduced; through the supporting effect of the first spring, when the reduction gearbox vibrates up and down, the reduction gearbox can be relieved by the first spring, the through groove is formed for the bolt to move, and damping can be achieved when the reduction gearbox vibrates left and right.

Description

Technical Field

[0001] The utility model relates to the technical field of oil-powered unmanned helicopter transmission mechanisms, in particular to an oil-powered unmanned helicopter transmission mechanism. Background Art

[0002] UAV is the abbreviation of unmanned aerial vehicle. UAVs are divided into electric UAVs and fuel-powered UAVs according to their driving methods. Fuel-powered unmanned helicopters have excellent wind resistance, relatively stable fuselage during operation and wider range of applications. In particular, fuel-powered unmanned helicopters have long flight time, high load capacity, wide adaptability to harsh environments and stable performance. They are widely used in tasks such as crop protection, forest fire monitoring, aerial photography, land surveying, and post-disaster loss assessment.

[0003] The engine power of a gasoline-powered unmanned helicopter needs to be transmitted to the main rotor shaft and the tail drive shaft respectively. The engine power of a traditional gasoline-powered unmanned helicopter needs to be reduced in speed through a main reduction gearbox and then directly transmitted to the main rotor shaft and the side drive shaft.

[0004] The existing oil-powered unmanned helicopter transmission mechanism is mostly realized by using different meshing ratios of gears, and even multi-stage meshing transmission is required to achieve the reduction transmission effect. The vibration caused by the collision of gears has a great impact on the UAV. Therefore, it is necessary to design a oil-powered unmanned helicopter transmission mechanism. Utility Model Content

[0005] Based on this, it is necessary to provide a transmission mechanism for an oil-powered unmanned helicopter to address the above technical problems.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a transmission mechanism of an oil-powered unmanned helicopter, including a frame and a reduction gearbox, a main transmission shaft is installed on the top of the reduction gearbox, four L-shaped pressure cylinders are installed on the frame, the four L-shaped pressure cylinders are located at the four corners of the reduction gearbox, and a gap is left between adjacent L-shaped pressure cylinders for the side transmission shaft to pass through. Pressure plates are slidably connected to the two right-angled sides of the L-shaped pressure cylinder, and the pressure plates are cooperated with the reduction gearbox; it also includes a bottom plate and a movable plate, a plurality of bolts are threadedly connected to the bottom plate, the bolts are threadedly connected to the reduction gearbox, a plurality of springs are installed on the bottom plate, the output end of the spring is connected to the movable plate, a through groove for the bolts to move is provided on the frame, a movable groove is provided on the movable plate, and the inner wall of the movable groove abuts against the bolts.

[0007] Preferably, a friction pad is installed on the pressure plate, and the friction pad abuts against the reduction gear box.

[0008] Preferably, a second spring is installed in the L-shaped pressure cylinder, and the output end of the second spring abuts against the pressure plate.

[0009] Preferably, a plurality of universal balls are rotatably mounted on the movable plate, and the universal balls abut against the bottom of the frame.

[0010] Preferably, the adjacent L-shaped pressure cylinders are all mounted on the frame via a mounting plate, and a plurality of fastening bolts are mounted on the mounting plate.

[0011] Preferably, the adjacent mounting plates are connected by arc-shaped plates.

[0012] Compared with the existing technology, this technical solution has at least one of the following beneficial effects:

[0013] Through the setting of the L-shaped pressure cylinder, when the reduction gearbox vibrates and slides to one side, the pressure generated on the pressure plate can make the pressure plate on the side of the L-shaped pressure cylinder pop out, thereby increasing the friction force on the reduction gearbox and reducing its vibration effect;

[0014] Through the supporting effect of spring 1, the vibration of the reduction gear box up and down can be alleviated by spring 1, and the through slot is provided for the bolt to move, so that the reduction gear box can be damped when it vibrates left and right. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A top cross-sectional view of an embodiment of the present invention;

[0016] Figure 2 A side sectional view of an embodiment of the present invention;

[0017] Figure 3 A perspective view of an embodiment of the present invention;

[0018] In the figure, 1. Frame; 2. Reducer; 3. L-shaped pressure cylinder; 4. Pressure plate; 5. Bottom plate; 6. Moving plate; 7. Bolt; 8. Spring 1; 9. Through groove; 10. Moving groove; 11. Friction pad; 12. Spring 2; 13. Universal ball; 14. Mounting plate; 15. Fastening bolt; 16. Arc plate; 21. Main drive shaft; 22. Side drive shaft. DETAILED DESCRIPTION

[0019] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0020] See also Figures 1 to 3The embodiment of the present application provides a transmission mechanism of an oil-powered unmanned helicopter, including a frame 1 and a reduction gear box 2, a main transmission shaft 21 is installed on the top of the reduction gear box 2, four L-shaped pressure cylinders 3 are installed on the frame 1, the pressure source in the L-shaped pressure cylinder 3 can be high-pressure gas, the four L-shaped pressure cylinders 3 are located at the four corners of the reduction gear box 2, and a gap is left between adjacent L-shaped pressure cylinders 3 for the side transmission shaft 22 to pass through. A pressure plate 4 is slidably connected to the two right-angled sides of the L-shaped pressure cylinder 3, and the pressure plate 4 is cooperated with the reduction gear box 2; it also includes a bottom plate 5 and a movable plate 6, a plurality of bolts 7 are threadedly connected to the bottom plate 5, the bolts 7 are threadedly connected to the reduction gear box 2, a plurality of springs 8 are installed on the bottom plate 5, the output end of the spring 8 is connected to the movable plate 6, a through groove 9 for the bolt 7 to move is provided on the frame 1, and a movable groove 10 is provided on the movable plate 6, the inner wall of the movable groove 10 abuts against the bolt 7, and the shock absorption of the reduction gear box 2 is mostly force transmission, or the reduction gear box 2 will only be driven by vibration to move a small distance, which will not affect the transmission of the transmission shaft.

[0021] In this embodiment, when the gear transmission mechanism in the reduction box 2 vibrates during transmission, the reduction box 2 will shake, thereby squeezing the pressure plate 4 in the shaking direction, causing it to transmit pressure toward the L-shaped pressure cylinder 3, so that the pressure plate 3 on the other side of the L-shaped pressure cylinder 3 can increase the outward squeezing force, and finally alleviate the movement tendency of the reduction box 2 caused by vibration; through the arrangement of four L-shaped pressure cylinders 3, when the pressure plate 4 on one side of the L-shaped pressure cylinder 3 is pressurized, the other side can pop out and squeeze, compared with the U-shaped or mouth-shaped pressure cylinder, the pressure plate 4 on the opposite side of the pressure plate 4 on the pressurized side will pop out and is not easy to reset, and gaps can be provided between the L-shaped pressure cylinders 3 to facilitate the transmission of power to the side transmission The gearbox 2 is mounted on the frame 1 through the threaded connection of the bolts 7 on the bottom plate 5, and the movable plate 6 is supported by the spring 8, so that the gearbox 2 is fixed relative to the frame 1. Therefore, when the gearbox 2 has a tendency to move up and down due to vibration, the vibration of the gearbox 2 can be reduced by the support effect of the spring 8 and the friction effect of the pressure plate 4; the through groove 9 is set so that when the gearbox 2 vibrates and moves horizontally, the bolt 7 can pass through, and the bolt 7 can drive the bottom plate 5, spring 8 and movable plate 6 to move together; the movable groove 10 on the movable plate 10 enables the spring 8 between the bottom plate 5 and the movable plate 6 to have a buffering effect.

[0022] In some embodiments, in order to further improve the friction and shock absorption effect of the reduction gearbox 2, a friction pad 11 is installed on the pressure plate 4, and the friction pad 11 abuts against the reduction gearbox 2. The non-smooth surface of the friction pad 11 enhances the friction effect, and the friction pad 11 can no longer be compressed.

[0023] In some embodiments, in order to facilitate the reset of the pressure plate 4 that is compressed or extended in the L-shaped pressure cylinder 3, a second spring 12 is installed in the L-shaped pressure cylinder 3, and the output end of the second spring 12 abuts against the pressure plate 4.

[0024] In some embodiments, to facilitate the movement of the movable plate 6 and reduce friction between it and the frame 1 during movement, a plurality of universal beads 13 are rotatably mounted on the movable plate 6. The universal beads 13 abut against the bottom of the frame 1. Thus, the movement of the movable plate 6 is coordinated by the rotation of the universal beads 13. The universal beads 13 are made of a strong, lightweight metal material to prevent damage.

[0025] In some embodiments, in order to install the L-shaped pressure cylinder 3 on the frame 1 , adjacent L-shaped pressure cylinders 3 are installed on the frame 1 through a mounting plate 14 , and a plurality of fastening bolts 15 are installed on the mounting plate 14 .

[0026] In some embodiments, to further enhance the stability of the L-shaped pressure cylinder 3, adjacent mounting plates 14 are connected by arc plates 16. Thus, when the L-shaped pressure cylinder 3 is subjected to force, the force can be transferred to the adjacent mounting plates 14 through the arc plates 16.

[0027] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0028] The above embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the concept of the present invention, and these variations and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0031] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

Claims

1. A transmission mechanism for an oil-powered unmanned helicopter, comprising a frame (1) and a reduction gearbox (2), wherein a main transmission shaft (21) is mounted on the top of the reduction gearbox (2), characterized in that: Four L-shaped pressure cylinders (3) are installed on the frame (1), and the four L-shaped pressure cylinders (3) are located at the four corners of the reduction box (2). A gap for the side transmission shaft (22) to pass through is left between adjacent L-shaped pressure cylinders (3). Pressure plates (4) are slidably connected in the two right-angled sides of the L-shaped pressure cylinder (3), and the pressure plates (4) are arranged in conjunction with the reduction box (2); it also includes a bottom plate (5) and a movable plate (6), a plurality of bolts (7) are threadedly connected on the bottom plate (5), and the bolts (7) are threadedly connected to the reduction box (2). A plurality of springs (8) are installed on the bottom plate (5), and the output end of the spring (8) is connected to the movable plate (6). A through groove (9) for the bolts (7) to move is provided on the frame (1), and a movable groove (10) is provided on the movable plate (6). The inner wall of the movable groove (10) abuts against the bolts (7).

2. The oil-powered unmanned helicopter transmission mechanism according to claim 1, characterized in that: A friction pad (11) is mounted on the pressure plate (4), and the friction pad (11) abuts against the reduction gearbox (2).

3. The oil-powered unmanned helicopter transmission mechanism according to claim 1, characterized in that: A second spring (12) is installed in the L-shaped pressure cylinder (3), and the output end of the second spring (12) is in contact with the pressure plate (4).

4. The oil-powered unmanned helicopter transmission mechanism according to claim 1, characterized in that: A plurality of universal balls (13) are rotatably mounted on the movable plate (6), and the universal balls (13) abut against the bottom of the frame (1).

5. The oil-powered unmanned helicopter transmission mechanism according to claim 1, characterized in that: The adjacent L-shaped pressure cylinders (3) are all mounted on the frame (1) via a mounting plate (14), and a plurality of fastening bolts (15) are mounted on the mounting plate (14).

6. The oil-powered unmanned helicopter transmission mechanism according to claim 5, characterized in that: Adjacent mounting plates (14) are connected via arc-shaped plates (16).

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