Propeller connecting shaft thrust structure

Abstract

The utility model discloses a propeller connecting shaft thrust structure, including cylinder body, crankshaft, machine body bearing, the end of crankshaft is installed on cylinder body through machine body bearing, still include installing in the thrust nut A of crankshaft output end, propeller connecting axle and locking nut, wherein, propeller connecting axle is located between thrust nut A and locking nut, and its axial is equipped with taper hole and the interference fit connection of crankshaft, and the outside of propeller connecting axle is equipped with the outer thread and flange surface of connecting thrust nut A, locking nut is installed in the end of crankshaft output end, is used for the right side of propeller connecting axle of pressing tightly. The utility model has the advantages of compact structure, prevents the crankshaft from knocking into cylinder body etc.

Description

Technical Field

[0001] This utility model relates to the field of unmanned aerial vehicle (UAV) engine technology, and in particular to a propeller connecting shaft thrust-resistant structure. Background Technology

[0002] The propeller connecting shaft is pressed onto the crankshaft output end by hammering, and the two are fixed together by an interference fit. This method of pressing the connecting shaft onto the crankshaft by hammering can easily cause excessive axial movement of the crankshaft during assembly, resulting in the crankshaft hitting the cylinder block, which poses problems such as assembly difficulties and safety hazards.

[0003] The above background information is provided only to aid in understanding the concept and technical solution of this utility model. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above information was disclosed on the filing date of this patent application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Utility Model Content

[0004] The main purpose of this utility model is to propose a compact structure that not only avoids axial thrust during assembly and use, preventing the crankshaft from axially moving and hitting the engine body, but also adjusts the interference fit between the propeller connecting shaft and the crankshaft output end, providing a thrust-resistant structure for the propeller connecting shaft.

[0005] Therefore, this utility model proposes a thrust-resistant structure for a propeller connecting shaft.

[0006] Preferably, the present invention may also have the following technical features:

[0007] A propeller connecting shaft thrust-resistant structure includes a cylinder block, a crankshaft, and a machine body bearing. The end of the crankshaft is mounted on the cylinder block via the machine body bearing. The structure also includes a thrust nut A, a propeller connecting shaft, and a locking nut mounted on the output end of the crankshaft. The propeller connecting shaft is located between the thrust nut A and the locking nut, and has an axially tapered hole for interference fit with the crankshaft. The outer side of the propeller connecting shaft has an external thread and a flange face for connecting to the thrust nut A. The locking nut is mounted on the end of the crankshaft output end and is used to press the right side of the propeller connecting shaft.

[0008] Furthermore, the thrust nut A has a U-shaped structure, and its end away from the propeller connecting shaft is provided with a radial limiting surface; the limiting surface is located between the body bearing and the propeller connecting shaft.

[0009] Furthermore, the flange face of the propeller connecting shaft is provided with several axial mounting holes.

[0010] 4. The propeller connecting shaft thrust structure as described in claim 1, characterized in that: a cylindrical hole extends from the tapered hole of the propeller connecting shaft near the cylinder body.

[0011] Furthermore, the cylindrical hole and the crankshaft output end are fitted with a clearance.

[0012] Furthermore, it also includes a thrust nut B, which is installed on the external thread of the propeller connecting shaft and is located to the right of the thrust nut A.

[0013] Furthermore, a radial protruding ring is provided on the outer side of the end of the locking nut that is in contact with the propeller connecting shaft, in order to increase the contact area between the locking nut and the propeller connecting shaft.

[0014] Furthermore, the propeller connecting shaft has a groove that matches the convex ring of the thrust nut B, so as to reduce the space occupied by the thrust nut B and make the overall assembly more compact.

[0015] The beneficial effects of this utility model compared with the prior art include: by adjusting the interference fit between the propeller connecting shaft and the crankshaft output end through the thrust nut and the locking nut, the thrust nut also acts as a thrust stop through contact with the engine block bearing, thus preventing the crankshaft from being subjected to axial thrust during assembly and use, which could cause the crankshaft to move axially and collide with the engine block, thereby speeding up the production cycle and improving engine safety. Attached Figure Description

[0016] Figure 1 This is an assembly diagram of the present invention.

[0017] Figure 2 This is a cross-sectional view of the connection position of this utility model. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to specific embodiments and the accompanying drawings. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope and application of the present invention.

[0019] Non-limiting and non-exclusive embodiments will be described with reference to the following figures, wherein the same reference numerals denote the same parts unless otherwise specifically stated.

[0020] like Figure 1-2The diagram illustrates a propeller connecting shaft thrust-resistant structure, comprising a cylinder block 7, a crankshaft 6, and a chassis bearing 1. The end of the crankshaft 6 is mounted on the cylinder block 7 via the chassis bearing 1. As an improvement, it further includes a thrust nut A5, a propeller connecting shaft 8, and a locking nut 3 mounted on the output end of the crankshaft 6. The propeller connecting shaft 8 is located between the thrust nut A5 and the locking nut 3, and has an axially tapered hole that is interference-fitted to the output end of the crankshaft 6. The outer side of the propeller connecting shaft 8 has an external thread 9 for connecting the thrust nut A5 and a flange face 2. The thrust nut A5 has a U-shaped structure and is fitted onto the external thread 9 of the propeller connecting shaft 8. The end away from the propeller connecting shaft 8 also has a radial limiting surface 10. The limiting surface 10 has a through hole and is slidably mounted on the output end of the crankshaft 6, located between the chassis bearing 1 and the propeller connecting shaft 8. The locking nut 3 is mounted at the very end of the output end of the crankshaft 6 to press against the propeller connecting shaft 8. In this embodiment, the propeller connecting shaft 8 and the output end of the crankshaft 6 are connected by a tapered surface. The propeller connecting shaft 8 is positioned by using a locking nut 3 and a locking nut 3. This not only avoids the crankshaft 6 from being subjected to axial thrust during assembly and use, causing it to move axially and collide with the cylinder block, but also allows for adjustment of the interference fit between the propeller connecting shaft 8 and the output end of the crankshaft 6.

[0021] Specifically, the flange face 2 of the propeller connecting shaft 8 is provided with several axial mounting holes 11 to facilitate connection of output power. Preferably, the tapered hole 12 of the propeller connecting shaft 8 extends into a cylindrical hole 13 at one end near the cylinder block 7. The cylindrical hole 13 and the output end of the crankshaft 6 are clearance-fitted.

[0022] In a preferred embodiment, a thrust nut B4 is further included. The thrust nut B4 is installed on the external thread 9 of the propeller connecting shaft 8 and is located on the right side of the thrust nut A5. It is used to press the end of the thrust nut A5 away from the cylinder body 7 to enhance the connection stability between the thrust nut A5 and the propeller connecting shaft 8.

[0023] Preferably, the outer side of the end of the locking nut 3 that is in contact with the propeller connecting shaft 8 is provided with a radial protruding ring to increase the contact area between the locking nut 3 and the propeller connecting shaft 8.

[0024] Furthermore, the propeller connecting shaft 8 has a groove that matches the protruding ring 14 of the locking nut 3, so as to reduce the space occupied by the locking nut 3 and make the overall assembly more compact.

[0025] Those skilled in the art will recognize that numerous variations are possible with respect to the above description, and the embodiments and figures are merely for describing one or more specific implementations.

[0026] Although exemplary embodiments of the present invention have been described and illustrated, those skilled in the art will understand that various changes and substitutions can be made thereto without departing from the spirit of the present invention. Furthermore, many modifications can be made to adapt specific situations to the doctrine of the present invention without departing from the central concept of the present invention described herein. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but may include all embodiments and equivalents that fall within the scope of the present invention.

Claims

1. A propeller connecting shaft thrust structure, comprising a cylinder block, a crankshaft, and a machine block bearing, wherein the end of the crankshaft is mounted on the cylinder block via the machine block bearing, characterized in that: It also includes a thrust nut A, a propeller connecting shaft, and a locking nut installed at the output end of the crankshaft. The propeller connecting shaft is located between the thrust nut A and the locking nut, and has a tapered hole in its axial direction that is interference-fitted with the crankshaft. The outer side of the propeller connecting shaft has an external thread and a flange face for connecting the thrust nut A. The locking nut is installed at the end of the output end of the crankshaft and is used to press the right side of the propeller connecting shaft.

2. The propeller connecting shaft thrust structure as described in claim 1, characterized in that: The thrust nut A has a U-shaped structure, and its end away from the propeller connecting shaft is provided with a radial limiting surface; the limiting surface is located between the body bearing and the propeller connecting shaft.

3. The propeller connecting shaft thrust structure as described in claim 1, characterized in that: The flange face of the propeller connecting shaft is provided with several axial mounting holes.

4. The propeller connecting shaft thrust structure as described in claim 1, characterized in that: The tapered hole of the propeller connecting shaft extends into a cylindrical hole at one end near the cylinder block.

5. The propeller connecting shaft thrust-resistant structure as described in claim 4, characterized in that: The cylindrical hole and the crankshaft output end are fitted with a clearance.

6. The propeller connecting shaft thrust structure as described in claim 1, characterized in that: It also includes a thrust nut B, which is installed on the external thread of the propeller connecting shaft and is located to the right of the thrust nut A.

7. The propeller connecting shaft thrust structure as described in claim 1, characterized in that: The locking nut has a radial protruding ring on the outer side of the end that is in contact with the propeller connecting shaft.

8. The propeller connecting shaft thrust structure as described in claim 7, characterized in that: The propeller connecting shaft has a groove that matches the protruding ring of the locking nut.

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