Transmission shaft structure with multi-point support

Abstract

The utility model discloses a transmission shaft structure with multi-point support, which comprises a long transmission shaft and a short transmission shaft, two ends of the long transmission shaft and the short transmission shaft are respectively provided with a coupler, the long transmission shaft and the short transmission shaft are respectively provided with a transmission shaft hanger, and the transmission shaft hangers are fixed on a machine body frame through screws. The transmission shaft has the advantages that a large-length single-section transmission shaft arrangement structure supported by a multi-point supporting hanging frame is adopted on a multi-point supporting transmission shaft structure, the combination form of a multi-section transmission shaft and a universal joint is effectively avoided, the number of parts is reduced, and the dead weight of a transmission system is reduced; meanwhile, shock-absorbing rubber is arranged in the transmission shaft shock-absorbing hanger, so that the problem that the control capability of the whole machine is reduced due to vibration of the transmission shaft can be effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of unmanned aircraft drive systems, and particularly to a drive shaft structure with multi-point support. Background Art

[0002] The drive shaft is an important component for transmitting power in the drive train. Its function is to transmit the power of the engine to the end, so that the end generates driving force. It is mainly composed of a shaft tube, a telescopic sleeve and a universal joint.

[0003] In the existing field of unmanned aircraft, with the increase of load requirements, long-axis drive shafts of unmanned aircraft are gradually adopted. Generally, the drive system needs to adopt an arrangement structure of multiple drive shafts and multiple universal joints. During takeoff and acceleration, the rotational speed of the drive shaft is the highest. However, due to the existence of the universal joint, the eccentric vibration excitation caused by the high-speed rotation of the drive shaft will be transmitted to the unmanned aircraft mounting frame through the mounting bracket. In severe cases, it will cause the resonance of the fuselage, reducing the control ability of the whole machine. For the transmission and installation on the aircraft frame using mechanisms such as universal joints, in addition to the relatively large weight of the universal joint, an additional mechanism for connecting the universal joint needs to be designed, resulting in an additional bracket, further increasing the weight of the aircraft frame. The use of a universal coupling not only reduces the transmission efficiency of the whole machine, increases fuel consumption, but also increases the vibration of the whole machine and worsens the control. Utility Model Content

[0004] The purpose of the present utility model is to overcome the deficiencies of the prior art and provide a drive shaft structure with multi-point support, so as to improve the transmission efficiency, reduce the manufacturing cost, reduce the weight of the whole machine, improve the overall performance index of the whole machine, and make the transmission more reliable and stable.

[0005] To achieve the above purpose, the present utility model provides the following technical solution: A drive shaft structure with multi-point support, including a drive shaft and a main reducer. The technical key points are:

[0006] The drive shaft includes a long drive shaft and a short drive shaft. A coupling is provided at each end of the long drive shaft. The coupling at one end of the long drive shaft is connected to the main reducer, and the coupling at the other end of the long drive shaft is connected to the output end of the power assembly. The output end of the power assembly is fixed to the fuselage frame by screws;

[0007] Three drive shaft hangers are further provided on the long drive shaft. The three drive shaft hangers are all fixed to the fuselage frame by screws;

[0008] A short drive shaft is provided on the other side of the output end of the power assembly. A coupling is also provided at each end of the short drive shaft. A drive shaft hanger is provided on the short drive shaft. The one drive shaft hanger is fixed to the fuselage frame by screws;

[0009] Preferably, the drive shaft hanger includes a bearing, a rubber support pad and two retaining rings arranged at intervals. The two sides of the two retaining rings are fixedly connected to the drive shaft hanger through bolts respectively.

[0010] Preferably, the rubber support is a shock pad, which is installed on the outer ring of the bearing, and the retaining ring is located on the outer ring of the shock pad.

[0011] Preferably, the bearing and the shock pad are an integrated assembly structure, and are connected to the long drive shaft by being press-fitted into the drive shaft hanger.

[0012] The advantages and beneficial effects of the present utility model are as follows: The present utility model provides a drive shaft structure with multi-point support. By installing three drive shaft hangers on the long drive shaft and one drive shaft hanger on the short drive shaft, the installation method of the intermediate support bracket of the drive shaft is simple. With such a drive shaft structure, no additional transition installation brackets are required, and the layout requirements of the fuselage drive system with a lateral span greater than 2000 mm can be achieved, solving the problem of the design of large-span brackets. Description of the Drawings

[0013] Figure 1 It is a schematic diagram of the overall structure of the drive shaft structure;

[0014] Figure 2 It is a schematic diagram of the drive shaft hanger structure;

[0015] In the figure: 1, coupling; 2, drive shaft hanger; 3, long drive shaft; 4, power assembly output end; 5, short drive shaft; 6, bearing; 7, rubber support pad; 8, retaining ring. Specific Embodiments

[0016] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present utility model.

[0017] Please refer to Figure 1 , the present utility model provides a technical solution: A drive shaft structure with multi-point support, which is composed of a coupling 1, a drive shaft hanger 2, a long drive shaft 3, a power assembly output end 4 and a short drive shaft 5. The drive shaft hanger 2 includes a bearing 6, a rubber support pad 7 and two retaining rings 8 arranged at intervals. The two sides of the two retaining rings are respectively fixed to the drive shaft hanger 2 through bolts, so that the drive shaft hanger 2 has the functions of support and vibration absorption.

[0018] Further, the output end 4 of the power assembly is fixed to the fuselage frame with screws;

[0019] Further, three drive shaft hangers 2 are installed on the long drive shaft 3, and couplings 1 are installed at both ends thereof. One end is connected to the output end 3 of the power assembly, and the other end is connected to the main reducer. The three drive shaft hangers 2 are fixed to the fuselage frame with screws;

[0020] Further, one drive shaft hanger 2 is installed on the short drive shaft 5, and couplings 1 are installed at both ends thereof. One end is connected to the output end 3 of the power assembly, and the other end is connected to the main reducer; the drive shaft hanger is fixed to the fuselage frame with screws.

[0021] In this application, a rubber support pad 7 is provided on the outer ring of the bearing 6 in the drive shaft hanger. The rubber support pad 7 is a shock-absorbing pad. The sliding bearing 6 and the rubber support pad 7 are an integral assembly structure. The bearing 6 and the shock-absorbing pad 7 are press-fitted into the drive shaft hanger 2 and connected to the drive shaft. The two mainly serve to support the drive shaft and absorb the rotational vibration of the drive shaft. The bearing 6, the shock-absorbing pad 7 and the drive shaft hanger 2 are connected by an interference fit.

[0022] In this application, the drive shaft hanger in the middle of the drive shaft adopts a lightweight design, which not only reduces the weight of the drive shaft hanger, but also uses a rubber support in the middle of the drive shaft to avoid serious problems such as drive shaft vibration that affect the control of the UAV and even impact the frame.

[0023] In this application, a single-section drive shaft layout structure with a large length supported by a multi-point support hanger is adopted, effectively avoiding the combination form of multiple drive shafts and universal joints, reducing the number of parts and the self-weight of the transmission system; at the same time, a rubber support pad is provided inside the drive shaft hanger, which can effectively avoid the influence of drive shaft vibration on the overall performance index and provide a quiet and stable control environment for the whole machine. At the same time, an oil groove is provided inside the bearing, and a maintenance-free structure is adopted; the bearing and the rubber support pad are an assembled integral structure, which is convenient to replace and improves the maintainability.

[0024] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "top", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying 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 construed as a limitation to the present utility model.

[0025] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "setting", "connection", "fixation", "swivel connection" and the like shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A transmission shaft structure with multi-point support, comprising a transmission shaft and a main reducer, characterized in that: The transmission shaft comprises a long transmission shaft (3) and a short transmission shaft (5), each end of the long transmission shaft (3) being provided with a coupling (1), the coupling (1) at one end of the long transmission shaft (3) being connected to the main reducer, the coupling (1) at the other end of the long transmission shaft (3) being connected to the output end (4) of the power assembly, and the output end (4) of the power assembly being fixed to the fuselage frame by means of screws; Three transmission shaft brackets (2) are arranged on the long transmission shaft (3), and the three transmission shaft brackets (2) are all fixed to the fuselage frame by screws; A short transmission shaft (5) is provided on the other side of the output end (4) of the power assembly, and a coupling (1) is also provided at each end of the short transmission shaft (5). A transmission shaft bracket (2) is provided on the short transmission shaft (5), and the transmission shaft bracket (2) is fixed to the fuselage frame by screws.

2. The transmission shaft structure with multi-point support according to claim 1, characterized in that: The transmission shaft hanger (2) comprises a bearing (6), a rubber support pad (7) and two retaining rings (8) arranged at intervals, and the two sides of the two retaining rings are fixedly connected to the transmission shaft hanger (2) by bolts.

3. The transmission shaft structure with multi-point support according to claim 2, characterized in that: The rubber support pad is a shock-absorbing pad, which is installed on the outer ring of the bearing, and the retaining ring is located on the outer ring of the shock-absorbing pad.

4. The transmission shaft structure with multi-point support according to claim 3, characterized in that: The bearing and the shock-absorbing pad are an integrated assembly structure, which is connected to the long transmission shaft (3) by being pressed into the transmission shaft hanger (2).

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