A kind of unmanned aerial vehicle belt tension adjustable generator mounting mechanism

Abstract

This utility model relates to the field of unmanned aerial vehicle (UAV) technology, and provides an adjustable generator mounting mechanism for UAV belt tensioning, aiming to solve the problems of heavy weight and large space occupation of existing generator belt tensioning devices. The mechanism includes a generator housing, a generator mounting plate, a mounting bracket, an adjusting bracket, adjusting screws, and fasteners. The generator mounting plate has a flat circular structure with ear plates extending from both sides of its outer edge. The mounting bracket is a stepped flat plate, hinged to the generator mounting plate via a pin. The adjusting bracket is a bent L-shaped plate with an elongated oval groove and a threaded hole on its central raised surface. The lower end of the adjusting screw makes contact with the surface of the generator mounting plate. Fasteners pass through the elongated oval groove and the fixing hole of the generator mounting plate. This utility model has the advantages of being lightweight, compact, and space-saving, and is particularly suitable for installation on small and medium-sized gasoline-powered UAVs.

Description

Technical Field

[0001] This utility model relates to the field of unmanned aerial vehicle (UAV) technology, and in particular to a generator mounting mechanism for UAVs. Background Technology

[0002] In existing small and medium-sized gasoline-powered UAVs, generators need to be installed on the UAV to power equipment such as pods and radar. The generator driven shaft is usually connected to the engine output shaft by a belt. Due to engine vibration and the elastic deformation of the belt itself, the belt will loosen and slip after a period of operation. Therefore, a tensioning mechanism is needed to adjust the belt to keep it tight.

[0003] Existing belt tensioning device technology is relatively mature. For example, Chinese invention patent CN201210194957.5 discloses a diesel engine belt tension adjustment device, which consists of a generator bracket, a tensioning bracket, a slider bolt, and a screw, forming an adjustment system. The screw pushes the slider bolt to slide within an elongated oval groove, thereby displacing the generator to adjust the tension. While the above device can adjust belt tension, it is not suitable for UAVs due to the following drawbacks: First, it has a complex structure and is heavy. The device uses a composite structure of double screws, sliders, and screws, resulting in a large number of screws and a large amount of metal, generating significant unnecessary weight. Second, it occupies a large space. Because the device uses a multi-layer bracket external mounting, the structure is not compact, resulting in a large size and a large installation space requirement. These defects increase the UAV's load, disrupt the UAV's compact fuselage layout, and affect the UAV's payload and endurance. Therefore, existing belt tensioning devices are not suitable for installation in the confined space of UAVs.

[0004] Therefore, there is an urgent need for a lightweight, compact, and space-saving belt tension adjustment mechanism to meet the installation requirements of drone generators. Summary of the Invention

[0005] The purpose of this utility model is to provide a generator mounting mechanism with adjustable belt tension for unmanned aerial vehicles (UAVs) to solve the problems of heavy weight and large space occupation in the prior art.

[0006] To achieve the above objectives, this application proposes the following technical solution: An adjustable belt tension generator mounting mechanism for unmanned aerial vehicles (UAVs) is used to fix it to the engine body. The mechanism is characterized by including a generator housing, a generator mounting plate, a mounting bracket, an adjusting bracket, adjusting screws, and fasteners. The generator mounting plate is a flat disc structure and is coaxially fixed to the front end face of the generator housing; the outer edges of the generator mounting plate extend integrally to form ear plates, the ear plates are provided with mounting shaft holes and several screw fixing holes, and the center of the generator mounting plate is provided with a through hole that mates with the generator driven shaft; The mounting bracket is a stepped flat plate, with its first surface fixed to the engine body and its second surface parallel to the generator mounting plate. The generator mounting plate is hinged to the second surface via a pin passing through the mounting shaft hole. This connection method restricts the adjustment movement of the generator mounting plate to simple rotation, with a controllable movement trajectory, used for push adjustment with adjusting screws. Furthermore, compared to structures such as sliding guide rails, the hinged structure is compact and lightweight.

[0007] The adjusting bracket is a bent L-shaped plate with a circular mounting hole at one end and an oblong groove at the other end; the middle of the adjusting bracket has a stepped three-dimensional surface protruding vertically along the generator axis, and the protruding surface has a threaded hole. The adjusting screw is threaded into the threaded hole, and its lower end makes contact with the surface of the generator mounting plate. It is used to adjust the angle of the generator mounting plate relative to the adjusting bracket to adjust the belt tension. This is the most critical innovation and weight reduction design of this application. By rotating the adjusting screw, its tiny linear displacement is amplified into a significant positional change at the other end of the generator mounting plate through the lever principle with the hinge point as the fulcrum, thereby efficiently adjusting the belt tension.

[0008] The fasteners are sequentially inserted into the corresponding fixing holes on the elongated groove and the generator mounting plate to lock the adjusting bracket to the generator mounting plate.

[0009] This structure ingeniously combines adjustment and locking functions into one. The elongated oval groove provides guidance and travel limitation for the rotation adjustment of the generator mounting plate; while the fastener simultaneously serves as both a connector and a locking element: during adjustment, the fastener slides within the groove; during locking, the fastener presses the two parts together to secure them. This greatly simplifies the structure, eliminating the need for separate guide rails and complex locking devices, thereby achieving the goals of weight reduction and minimizing overall space occupation.

[0010] The above design eliminates the need for multiple parts in traditional diesel engine tensioning devices, such as tensioning wheels, tensioning arms, and support shafts, thereby reducing the overall weight and making the overall structure more compact.

[0011] Specifically, the mounting bracket has through holes for fixing the generator to the engine, ensuring the rigidity and stability of the connection between the generator and the engine or the fuselage under high-frequency vibration environment.

[0012] Specifically, the generator housing is a cylindrical shell with several arc-shaped or elongated ventilation slots along its axial direction to enhance heat dissipation, effectively reduce the generator's operating temperature, and improve operational stability and service life.

[0013] Specifically, the generator mounting plate has several radial weight-reducing grooves around its through-hole. This reduces the overall weight while maintaining structural strength, which is beneficial for lightweight design of the UAV and reduces energy consumption.

[0014] Specifically, the center of the elongated groove on the adjusting bracket coincides with the center of the mounting shaft hole on the mounting bracket. This ensures that the generator rotates smoothly around the hinge shaft during adjustment, avoids eccentric stress, and improves adjustment accuracy and structural stability.

[0015] Specifically, the fastener is a bolt or screw, and its shank is in a clearance fit with the elongated oval groove. This allows the adjusting bracket to move freely along the groove direction during tension adjustment, ensuring smooth adjustment, while also ensuring a secure and reliable connection after locking.

[0016] Specifically, the mounting bracket, adjusting bracket, and generator mounting plate are all plate-shaped structural components, which facilitates stamping or bending, resulting in light weight, easy assembly, and suitability for mass production. Preferably, the mounting bracket, adjusting bracket, and generator mounting plate are sheet metal stamping parts or machined plate-shaped structures. Sheet metal stamping parts are integrally formed structures, offering higher structural strength compared to machined components and effectively avoiding stress concentration caused by welds; they also eliminate the need for mounting screws, resulting in lighter weight and simpler assembly, making them suitable for mass production. Machined plate-shaped structures allow for high-precision machining of features such as elongated oval grooves and adjusting screws, offering high flexibility and suitability for product development, testing, and verification stages. Furthermore, the sheet metal stamping parts are made of magnesium-aluminum alloy sheet, further reducing the overall weight of the mechanism.

[0017] Specifically, the lower end of the adjusting screw is provided with a rotatable pressure block, which abuts against the outer surface of the motor mounting plate. This design can adapt to changes in the angle of the mounting plate surface, prevent the screw from rotating or getting stuck, ensure uniform force application, and improve the smoothness of adjustment and contact reliability.

[0018] Beneficial effects: As can be seen from the above technical solutions, the present invention provides a generator mounting mechanism with adjustable belt tension for drones. Compared with the prior art, it has the following advantages: 1. In terms of weight optimization: The present invention adopts a design where the end of the adjusting screw presses against the side of the generator mounting plate, and cooperates with the elongated swivel of the adjusting bracket and the mounting bracket to achieve tension adjustment. It abandons the design of multiple parts such as the tension wheel, tension arm, and support shaft in the traditional diesel engine tensioning device. The elongated swivel simultaneously undertakes the dual functions of the guide rail and the locking groove, thereby eliminating the need for a separate guide rail and a complex locking device. The tensioning function is achieved with the fewest core components, which greatly reduces the overall weight of the mechanism and effectively solves the core defect of "heavy weight" in the prior art. It is very suitable for small drones that are very sensitive to weight.

[0019] 2. In terms of space occupation, the generator mounting plate rotates and adjusts close to the bracket, and the mounting bracket, adjustment bracket, and generator mounting plate all adopt plate-like structures to achieve extremely small radial dimensions and thickness, requiring no additional installation space; the traditional "tensioning wheel" and its matching tensioning arm, support shaft, and other structures are eliminated; the elongated slide groove simultaneously serves as a guide rail and locking groove. Compared with the bulky "multi-layer bracket external type" of the existing technology, the structure of this utility model has the advantages of high integration and small space occupation, and is suitable for the layout requirements of the small space inside the engine compartment of UAVs.

[0020] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered as part of the utility model subject matter of this disclosure, provided that such concepts do not contradict each other.

[0021] The foregoing and other aspects, embodiments, and features of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description

[0022] The accompanying drawings are not drawn to scale according to a true reference numeral. In the drawings, each identical or nearly identical component shown in the various figures can be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 This is an isometric view of a belt-tension-adjustable generator mounting mechanism for small and medium-sized gasoline-powered unmanned aerial vehicles disclosed in this utility model. Figure 2 This is a front view of a belt tension adjustable generator mounting mechanism for small and medium-sized gasoline-powered unmanned aerial vehicles disclosed in this utility model. The specific meanings of each mark in the diagram are as follows: 1-Generator housing, 2-Generator mounting plate, 3-Generator driven shaft, 4-Adjusting bracket, 5-Mounting bracket, 6-Adjusting screw, 7-First screw fixing hole, 8-Mounting shaft hole. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this utility model pertains.

[0024] The terms "first," "second," and similar words used in this utility model patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" mean that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] Before introducing this application, the relevant background technology will be introduced first.

[0026] In small and medium-sized gasoline-powered UAVs, the generator is mainly used to power equipment such as the pod and radar. The generator driven shaft 3 is generally connected to the engine output shaft via a belt. The working principle is as follows: the belt is fitted onto both the engine output shaft and the generator driven shaft 3. When the engine is running, the engine output shaft drives the pulley to rotate, and the frictional force of the belt drives the generator driven shaft 3 to rotate synchronously, thereby driving the generator rotor to rotate and generate electricity. After a period of operation, the belt may become loose or slip, so a tensioning mechanism needs to be added to adjust the belt tension and ensure transmission efficiency and reliability.

[0027] The following description, in conjunction with the specific structure of the embodiment shown in the accompanying drawings, provides a further detailed introduction to the adjustable belt tension generator mounting mechanism for unmanned aerial vehicles (UAVs) disclosed in this utility model.

[0028] Figure 1 and Figure 2This invention discloses an isometric and front view of a belt-tension-adjustable generator mounting mechanism for small and medium-sized gasoline-powered unmanned aerial vehicles.

[0029] This embodiment provides a generator mounting mechanism specifically designed for small and medium-sized gasoline-powered fixed-wing UAVs, which reliably mounts the generator to the side of the engine and achieves convenient and precise adjustment of belt tension through a rotation and push adjustment mechanism.

[0030] like Figure 1 and Figure 2 As shown, the mounting mechanism mainly includes: generator housing 1, generator mounting plate 2, mounting bracket 5, adjusting bracket 4, and adjusting screw 6.

[0031] The generator mounting plate 2 is a flat, machined aluminum alloy disc, with its surface protruding approximately 8mm above the front end face of the generator housing 1, forming a rigid mounting flange. This mounting plate is fixedly connected to the threaded holes on the front end face of the generator housing 1 using four circumferentially distributed 5mm diameter hexagonal screws, achieving coaxial mounting. The generator driven shaft 3 passes through a through hole in the center of the mounting plate; to reduce weight, four radially extending weight-reducing grooves are symmetrically machined on the mounting plate flange.

[0032] The mounting bracket 5 is a stepped part formed by bending a 2.5mm thick magnesium-aluminum alloy plate. Its first plate surface, i.e., the horizontal surface, is fixed to the side mounting base of the engine body by two 6mm diameter bolts. Its second plate surface, i.e., the vertical surface, is parallel to the generator mounting plate 2 and is hinged to the mounting shaft hole 8 on the ear plate of the generator mounting plate 2 by a pin passing through the pin hole on it; allowing the generator as a whole to rotate freely around the axis of the pin.

[0033] The adjusting bracket 4 is an L-shaped plate formed by bending a 3mm thick magnesium-aluminum alloy plate. One end is fixed to the engine body through a circular mounting hole via a 5mm diameter bolt, located below the mounting bracket 5. The middle part is bent to form an upwardly protruding stepped three-dimensional surface, on which a threaded hole with a diameter of 8mm is machined. The other end is provided with an elongated oval groove, the center of which coincides with the center of the mounting shaft hole 8, with a radius of 30mm and a groove width of 6.2mm, for clearance fit of a 6mm diameter bolt.

[0034] In this embodiment, a 6mm diameter hexagon socket head cap screw is used as the fastener. It passes sequentially through the elongated groove of the adjusting bracket 4, a spring washer, and a flat washer, and finally screws into the 6mm diameter threaded hole of the first screw fixing hole 7 on the ear plate of the generator mounting plate 2. When this bolt is not fully tightened, the generator mounting plate 2 is allowed to drive the adjusting bracket 4 to rotate around the mounting shaft hole 8, and the bolt shank can slide within the elongated groove.

[0035] In this embodiment, an 8mm diameter hexagonal headstock retaining screw is used as the adjusting screw 6. It is screwed into the 8mm diameter threaded hole on the protruding surface of the adjusting bracket 4, and its lower end presses against the outer surface of the generator mounting plate 2.

[0036] Furthermore, Figure 1 and Figure 2 The initial installation process of the disclosed mechanism is as follows: The generator is initially installed in place using the installation mechanism of this application, so that the belt is fitted onto the pulleys of the engine output pulley and the generator driven shaft 3. At this time, the 6mm diameter bolts and adjusting screws 6 are in a semi-loose state.

[0037] Furthermore, Figure 1 and Figure 2 The publicly disclosed working process of the institution includes two steps: tension adjustment and locking.

[0038] Specifically as follows: The tension adjustment process is as follows: S11: Use an Allen wrench to rotate the adjusting screw 6 clockwise; as the screw is screwed in, its lower end pushes downwards against the surface of the generator mounting plate 2.

[0039] S12: Since one end of the generator mounting plate 2 is hinged through the mounting shaft hole 8, under the action of the top thrust, the entire generator mounting plate 2, together with the generator, rotates outward around the axis of the hinge pin, that is, away from the engine.

[0040] S13: The rotation of the generator pulls its pulley, thereby tensioning the belt. During this process, the 6mm diameter bolts, which serve as fasteners, slide synchronously within the elongated groove of the adjusting bracket 4.

[0041] S14: Determine whether the belt tension is appropriate using a belt tension meter.

[0042] The locking and fixing process is as follows: S21: When the belt tension reaches the optimal value, keep the position of the adjusting screw 6 unchanged.

[0043] S22: Use another Allen wrench to tighten the nut on the 6mm diameter bolt of the fastener to lock it in place. At this time, the generator mounting plate 2, adjusting bracket 4 and mounting bracket 5 are tightly pressed together to form a rigid whole, preventing loosening under vibration.

[0044] S23: Finally, check and fine-tune the adjusting screw 6 again to ensure that the tension has not changed during the locking process.

[0045] This embodiment requires only the turning of a single adjusting screw 6 to achieve stepless fine-tuning of the tension, requiring minimal operating space and making it ideal for maintenance in the confined environment of a drone's engine compartment. The core components are all plate-shaped parts made of lightweight alloy materials, eliminating traditional complex parts such as tension wheels and tension arms. The overall weight is reduced by more than 60% compared to traditional mechanisms, significantly saving space and weight.

[0046] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A generator mounting mechanism with adjustable belt tension for unmanned aerial vehicles (UAVs), used for fixing to the engine body, characterized in that: Includes generator housing (1), generator mounting plate (2), mounting bracket (5), adjusting bracket (4), adjusting screw (6) and fasteners; The generator mounting plate (2) is a flat disc structure and is coaxially fixed to the front end face of the generator housing (1); the outer edges of the generator mounting plate (2) extend integrally to form ear plates, the ear plates are provided with mounting shaft holes (8) and several screw fixing holes, and the center of the generator mounting plate (2) is provided with a through hole that mates with the generator driven shaft (3); The mounting bracket (5) is a stepped flat plate, with its first plate surface fixed to the engine body and its second plate surface arranged parallel to the generator mounting plate (2); the generator mounting plate (2) is hinged to the second plate surface through a pin passing through the mounting shaft hole (8); The adjusting bracket (4) is a bent L-shaped plate with a circular mounting hole at one end and an oblong sliding groove at the other end; the adjusting bracket (4) has a stepped three-dimensional surface protruding vertically along the generator axis in the middle, and a threaded hole is provided on the protruding surface; The adjusting screw (6) is threaded into the threaded hole, and its lower end is in contact with the surface of the generator mounting plate (2) to adjust the angle of the generator mounting plate (2) relative to the adjusting bracket (4) so ​​as to adjust the belt tension. The fasteners are sequentially inserted into the corresponding fixing holes on the elongated groove and the generator mounting plate (2) to lock the adjusting bracket (4) and the generator mounting plate (2).

2. The UAV belt tension adjustable generator mounting mechanism according to claim 1, characterized in that, The generator housing (1) is a cylindrical housing with several arc-shaped or elongated ventilation slots along its axial direction.

3. The adjustable belt tension generator mounting mechanism for unmanned aerial vehicles according to claim 1, characterized in that, The generator mounting plate (2) has several radial weight-reducing grooves around the through hole.

4. The UAV belt tension adjustable generator mounting mechanism according to claim 1, characterized in that, The center of the elongated groove on the adjusting bracket (4) coincides with the center of the mounting shaft hole (8) on the mounting bracket (5).

5. The UAV belt tension adjustable generator mounting mechanism according to claim 1, characterized in that, The fastener is a bolt or screw, and its shank is in clearance fit with the elongated groove.

6. The adjustable belt tension generator mounting mechanism for unmanned aerial vehicles according to claim 1, characterized in that, The mounting bracket (5), adjusting bracket (4) and generator mounting plate (2) are all plate-shaped structural components.

7. The UAV belt tension adjustable generator mounting mechanism according to claim 1, characterized in that, The lower end of the adjusting screw (6) is provided with a rotatable pressure block, which abuts against the outer surface of the motor mounting plate (2).

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