Aviation small engine propeller fixing structure

Abstract

The utility model relates to a small aviation engine propeller fixing structure which comprises a small aviation engine connecting crankshaft and a small aviation engine propeller hub assembling and connecting structure, the small aviation engine propeller hub assembling and connecting structure comprises a propeller pressing conical head and a propeller hub body, and a self-locking assembly is connected between the propeller conical head and the propeller hub body. The small aviation engine connecting crankshaft comprises a crankshaft cylinder, an inner connecting end arranged at the front end of the crankshaft cylinder and a crankshaft block structure arranged at the rear end of the crankshaft cylinder, and the inner connecting end is connected with a key slot hole formed in the rear end of a propeller hub body. By the adoption of the propeller fixing structure, the phenomena that stress is not uniform, propeller mounting holes are damaged, propeller mounting faces are crushed and the like when propeller mounting bolts are screwed down can be effectively avoided, and meanwhile the problem that stress is not uniform when an engine runs at a high rotating speed is solved. Propeller damage is reduced, the service life of propellers is prolonged, and enterprise development cost is reduced. Meanwhile, the structure is simple, operation is convenient, arrangement is compact, and machining is easy.

Description

Technical Field

[0001] The utility model relates to an assembly tool, in particular to a fixing structure for a propeller of a small aviation engine. Background Art

[0002] Currently, small drones on the market are oil-powered, and the propellers are fixed with bolts. This can lead to uneven force on the bolts, damage to the propeller mounting holes during the installation process, crushing of wooden propeller mounting surfaces, and uneven force when the engine is running at high speeds, which greatly reduces the service life of the propellers. Engine research and development requires a large number of propellers to be prepared as backup options during the engine development phase. Aircraft customers need to regularly inspect and replace propellers to ensure flight safety. The propellers in the existing small aviation engine propeller fixing structure are fixed with 6 bolts. The problems of uneven force on the bolts caused by high-speed engine operation and damage to the propellers caused by repeated tightening of the propeller bolts are also a problem. Utility Model Content

[0003] The purpose of the utility model is to provide a propeller fixer for a small aviation engine, which solves the problem of uneven force on the bolts caused by high-speed operation of the engine when the propeller is fixed with 6 bolts and the problem of damage to the propeller caused by repeated tightening of the propeller bolts.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a small aviation engine propeller fixing structure, including a small aviation engine connecting crankshaft structure and a small aviation engine hub assembly connection structure, the small aviation engine hub assembly connection structure includes a propeller cone head and a hub body, a self-locking component is connected between the propeller cone head and the hub body, the small aviation engine connecting crankshaft structure includes a crankshaft cylinder, an inner connecting end connected to the crankshaft cylinder and a crankshaft block structure connected to the rear end of the crankshaft body cylinder, and the inner connecting end is connected to the rear end of the hub body with a keyway hole.

[0005] The self-locking assembly comprises a propeller shaft screw and a self-locking nut connected between the propeller cone head and the propeller hub body.

[0006] The propeller cone head and the propeller hub body are connected to each other by a pin group, and the pin group is circumferentially arranged between the propeller cone head and the propeller hub body.

[0007] The crankshaft block structure comprises a fan-shaped lower hammer pendulum body, an outer shaft sleeve body arranged on the upper part of the lower hammer pendulum body, and a crankshaft column connector arranged between the lower hammer pendulum body and the outer shaft sleeve body.

[0008] The beneficial effects of this utility model are as follows: The propeller fixing structure effectively solves problems such as uneven force applied when tightening propeller bolts, damage to propeller mounting holes, and crushing of propeller mounting surfaces. It also solves the problem of uneven force applied during high-speed engine operation. This reduces propeller damage, extends propeller service life, and reduces development costs. It also features a simple structure, easy operation, compact layout, and ease of processing.

[0009] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structure of the utility model.

[0011] Figure 2 for Figure 1 Exploded diagram.

[0012] Figure 3 for Figure 1 Rear view stereogram.

[0013] In the figure: 1. propeller cone, 2. propeller hub, 3. crankshaft column, 4. inner connecting end, 5. keyway hole, 6. propeller shaft screw, 7. self-locking nut, 8. pin group, 9. lower hammer pendulum body, 10. outer shaft sleeve body, 11. crankshaft column connector. DETAILED DESCRIPTION

[0014] The terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end" used in this application to indicate positions or locations are based on the positions or locations shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

[0015] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc. should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0016] Example 1, as Figure 1-3As shown, a small aircraft engine propeller fixing structure includes a small aircraft engine connecting crankshaft and an aircraft engine hub assembly connection structure connected to the small aircraft engine connecting crankshaft, the small aircraft engine hub assembly connection structure includes a propeller cone head 1 and a hub body 2, a self-locking component is connected between the propeller cone head and the hub body, the small aircraft engine connecting crankshaft includes a crankshaft cylinder 3, an inner connecting end 4 provided at the front end of the crankshaft cylinder and a crankshaft block structure connected to the rear end of the crankshaft body cylinder, and the inner connecting end is connected to the keyway hole 5 provided at the rear end of the hub body.

[0017] The self-locking assembly includes a propeller shaft screw 6 and a self-locking nut 7 connecting the propeller cone head and the propeller hub body.

[0018] The propeller cone head and the propeller hub body are further connected to a pin group 8, which is circumferentially arranged between the propeller cone head and the propeller hub body.

[0019] The crankshaft block structure includes a fan-shaped lower hammer pendulum body 9, an outer shaft sleeve body 10 provided on the upper part of the lower hammer pendulum body, and a crankshaft column connecting body 11 provided between the lower hammer pendulum body and the outer shaft sleeve body.

[0020] The propeller hub 2 is mounted on the crankshaft cylinder 3, transmitting engine power to the propeller and driving its rotation while also withstanding the propeller's reaction torque and thrust forces. The pin, made of stainless steel and installed in the propeller hub 2 with an interference fit, serves as a positioning mechanism for the propeller and is a key force transmission component during engine operation. The propeller shaft screw 6, which compresses and secures the propeller hub to the crankshaft, has one end with an internal thread and the other with an external thread. The internal thread connects to the internal connection end 4 of the crankshaft cylinder 3. The internal threaded end is tapered, increasing the contact surface area with the propeller hub. The propeller pressure plate secures the propeller, pressing the propeller against the hub and preventing rotation. The self-locking nut 7 is a special self-locking nut that rotates in the opposite direction of the engine, ensuring that the propeller does not loosen during engine operation. The self-locking nut 7 secures the propeller pressure plate. This structure addresses the uneven force distribution caused by six bolts securing the propeller during high-speed engine operation and the damage to the propeller caused by repeated re-tightening of the propeller bolts. After using this structure, the propeller will not be crushed when installed, which increases the service life of the propeller. It is fixed with a self-locking nut to reduce the risk of uneven force during propeller installation and bolt breakage caused by high speed operation.

[0021] This propeller fixing structure effectively solves problems such as uneven force applied when tightening propeller bolts, damage to propeller mounting holes, and crushing of propeller mounting surfaces. It also addresses uneven force applied during high engine speed operation. This reduces propeller damage, extends propeller service life, and reduces development costs. It also features a simple structure, easy operation, compact layout, and ease of processing.

[0022] The above embodiments are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering technicians in this field should fall within the scope of protection determined by the claims of the present invention.

[0023] The parts not involved in the present invention are the same as the existing technology or can be implemented by using the existing technology.

Claims

1. A small aircraft engine propeller fixing structure, characterized by: It includes a small aviation engine connecting crankshaft structure and a small aviation engine hub assembly connection structure. The small aviation engine hub assembly connection structure includes a propeller cone head and a hub body. A self-locking component is connected between the propeller cone head and the hub body. The small aviation engine connecting crankshaft structure includes a crankshaft cylinder, an inner connecting end connected to the crankshaft cylinder, and a crankshaft block structure connected to the rear end of the crankshaft body cylinder. The inner connecting end is connected to the rear end of the hub body with a keyway hole.

2. The small aircraft engine propeller fixing structure according to claim 1, characterized in that: The self-locking assembly comprises a propeller shaft screw and a self-locking nut connected between the propeller cone head and the propeller hub body.

3. The small aircraft engine propeller fixing structure according to claim 2, characterized in that: The propeller cone head and the propeller hub body are connected by a pin group for connection and fixing balance, and the pin group is circumferentially arranged between the propeller cone head and the propeller hub body.

4. The small aircraft engine propeller fixing structure according to claim 1, characterized in that: The crankshaft block structure comprises a fan-shaped lower hammer pendulum body, an outer shaft sleeve body arranged on the upper part of the lower hammer pendulum body, and a crankshaft column connector arranged between the lower hammer pendulum body and the outer shaft sleeve body.

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