Propeller mounting device and propeller mounting method

Abstract

A propeller attachment device according to the present invention has: a linking body which integrally turns with an output shaft of a motor; a mobile body; and an elastic body. The linking body has a base and a first receiving section which allows mounting and dismounting of a motor attachment section through the turning of a propeller in a circumferential direction and which restricts movement of the propeller in an axial direction. The mobile body has a second receiving section and is supported by the linking body, in a manner allowing movement in the axial direction, between a mounting / dismounting position and a restricted position. The mounting / dismounting position is a position where mounting / dismounting of the attachment section with respect to the first receiving section is allowed. The restricted position is a position beyond the mounting / dismounting position in a first direction that extends toward one end of the output shaft from another end thereof along the axial direction of the output shaft, and is a position which restricts the turning of the propeller in the circumferential direction with respect to the base. The elastic body pushes the mobile body in the first direction.

Description

[Technical field]

[0001] The present disclosure relates to a propeller mounting device and a propeller mounting method. [Background technology]

[0002] There is a propeller mounting device that mounts a propeller to an output shaft of a motor using the elastic force of an elastic body with the output shaft inserted into a through hole provided in the propeller. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2017-534517 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-described conventional structure, when the propeller is subjected to a strong wind or the like, a load is applied from the propeller to the elastic body, which may reduce the reliability of the propeller mounting.

[0005] Therefore, the present disclosure proposes a propeller mounting device and a propeller mounting method that can improve the reliability of mounting a propeller to the output shaft of a motor. [Means for solving the problem]

[0006] A propeller mounting device according to the present disclosure includes a base that is connected to an output shaft of a motor and that is provided with a through hole into which a protruding portion of the output shaft, including one end of the output shaft, is inserted, and a first receiving portion that receives the mounting portion in the axial direction of the output shaft in an axial direction of the output shaft to limit movement of the propeller in the axial direction by receiving the mounting portion, and a connecting body that rotates integrally with the output shaft, and a second receiving portion that is provided with a propeller that has a mounting portion and is provided with an opening into which the protruding portion protruding from the through hole is inserted, and that allows the mounting portion to be attached and detached by rotation of the propeller relative to the base in the circumferential direction of the output shaft. and a limiting position that is a position in a first direction from the other end of the output shaft toward the one end of the output shaft along the axial direction of the output shaft further than the detachment position, and where the second receiving portion receives the mounting portion attached to the first receiving portion in the circumferential direction, thereby limiting rotation of the propeller in the circumferential direction relative to the base, and the second receiving portion has a movable body that rotates integrally with the connecting body and an elastic body that pushes the movable body in the first direction and rotates integrally with the connecting body. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view of a propeller propulsion system according to a first embodiment of the present disclosure, viewed from diagonally above the propeller propulsion system. [Diagram 2] FIG. 1 is an exploded perspective view of a propeller propulsion system according to a first embodiment. [Diagram 3] 1 is a cross-sectional view of a propeller propulsion system according to a first embodiment. [Figure 4] FIG. 1 is a perspective view of a motor according to a first embodiment, viewed from diagonally above the motor. [Diagram 5] FIG. 1 is a perspective view of a motor according to a first embodiment, viewed from diagonally below the motor. [Figure 6] FIG. 1 is a perspective view of a propeller according to a first embodiment, viewed from diagonally above the propeller. [Figure 7]FIG. 1 is a perspective view of a propeller according to a first embodiment, viewed from diagonally below the propeller. [Figure 8] FIG. 2 is an exploded perspective view of the propeller according to the first embodiment, seen from diagonally above the propeller. [Figure 9] FIG. 2 is a side view of a portion of the propeller according to the first embodiment. [Figure 10] FIG. 2 is a plan view of a portion of a blade of the propeller according to the first embodiment. [Figure 11] FIG. 2 is a perspective view of the central portion of the propeller according to the first embodiment, seen from diagonally below the propeller. [Figure 12] FIG. 2 is a perspective view of a central portion of another propeller according to the first embodiment, viewed obliquely from below the other propeller. [Figure 13] FIG. 1 is a perspective view of a propeller mounting device according to a first embodiment, viewed from diagonally above the propeller mounting device. [Figure 14] FIG. 2 is an exploded perspective view of the propeller mounting device according to the first embodiment, seen from diagonally above the propeller mounting device. [Figure 15] FIG. 2 is a plan view of the propeller mounting device according to the first embodiment. [Figure 16] FIG. 2 is a bottom view of the propeller mounting device according to the first embodiment. [Figure 17] 2 is a cross-sectional view of a portion including an elastic body in the propeller mounting device according to the first embodiment. FIG. [Figure 18] FIG. 2 is a perspective view of another propeller mounting device according to the first embodiment, as viewed from diagonally above the other propeller mounting device. [Figure 19] 4 is a flowchart showing a propeller mounting process according to the first embodiment. [Figure 20] 5A to 5C are diagrams illustrating a process of attaching a propeller according to the first embodiment. [Figure 21] 5A to 5C are diagrams illustrating a process of attaching a propeller according to the first embodiment. [Figure 22]FIG. 1 is a perspective view of a propeller propulsion system of a reference example according to a first embodiment, as viewed obliquely from above the propeller propulsion system. [Figure 23] FIG. 11 is a perspective view of a portion of a propeller propulsion system according to a second embodiment of the present disclosure, viewed from diagonally above the propeller propulsion system. [Figure 24] FIG. 11 is a perspective view of a motor and propeller mounting device according to a second embodiment, as viewed obliquely from above the motor and propeller mounting device. [Diagram 25] FIG. 11 is a perspective view of a motor and propeller mounting device according to a second embodiment, as viewed from diagonally below the motor and propeller mounting device. [Figure 26] FIG. 11 is an exploded perspective view of a motor and propeller mounting device according to a second embodiment, as viewed obliquely from above the motor and propeller mounting device. [Figure 27] FIG. 11 is a perspective view of a portion of a motor and propeller mounting device according to a second embodiment, as viewed obliquely from above the motor and propeller mounting device. [Figure 28] FIG. 11 is a perspective view of a propeller propulsion system according to a modified example of the second embodiment, as viewed obliquely from above the propeller propulsion system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the following embodiments, the same components are designated by the same reference numerals, and duplicated descriptions will be omitted.

[0009] The explanation will be given in the following order: [1. First embodiment] [1-1. Configuration of the propeller propulsion system according to the first embodiment] [1-2. Motor] [1-3. Propeller] [1-4. Propeller mounting device] [1-5. Operation] [1-6. How to install and remove the propeller] [1-7.Effects] [1-8.Reference example] [2. Second embodiment] [2-1. Configuration of the propeller propulsion system according to the second embodiment] [2-2.Motor and propeller mounting device] [2-3. How to install and remove the propeller] [2-4. Effects] [2-5. Modifications]

[0010] [1. First embodiment] [1-1. Configuration of the propeller propulsion system according to the first embodiment] Fig. 1 is a perspective view of a propeller propulsion system 1 according to a first embodiment of the present disclosure, as viewed from diagonally above the propeller propulsion system 1. Fig. 2 is an exploded perspective view of the propeller propulsion system 1 according to the first embodiment. Fig. 3 is a cross-sectional view of the propeller propulsion system 1 according to the first embodiment.

[0011] As shown in Figs. 1 to 3, the propeller propulsion system 1 has a motor 2, a propeller 3, and a propeller mounting device 4. The propeller 3 is detachably mounted to an output shaft 21 (Fig. 2) of the motor 2 by the propeller mounting device 4. The propeller 3 and the propeller mounting device 4 rotate integrally with the output shaft 21 of the motor 2. The output shaft 21 of the motor 2, the propeller 3, and the propeller mounting device 4 rotate around a central axis Ax1. The propeller propulsion system 1 is provided on a flying object such as a drone. The flying object may be a manned flying object.

[0012] [1-2. Motor] Fig. 4 is a perspective view of the motor 2 according to the first embodiment, as viewed from diagonally above the motor 2. Fig. 5 is a perspective view of the motor 2 according to the first embodiment, as viewed from diagonally below the motor 2.

[0013] 3 to 5, the motor 2 has an output shaft 21, a rotor 22, a stator 23, and a support 24. The rotor 22, the stator 23, and the support 24 form a motor body 25. The motor 2 is an outer rotor type.

[0014] The output shaft 21 extends along the central axis Ax1. That is, the axial direction of the output shaft 21 is aligned with the central axis Ax1. The output shaft 21 is supported by a support 24 so as to be rotatable around the central axis Ax1. The output shaft 21 has one end 21a which is an end on one side in the axial direction, and the other end 21b which is an end on the other side in the axial direction. The output shaft 21 also has a protruding portion 21c. The protruding portion 21c includes the one end 21a and protrudes from the motor body 25. The output shaft 21 is made of a metal material or the like.

[0015] Hereinafter, the direction from the other end 21b toward the one end 21a along the axial direction of the output shaft 21 will be referred to as the first direction D1, and the opposite direction of the first direction D1 will be referred to as the second direction D2. The first direction D1 is along the upward direction in the vertical direction of the propeller propulsion system 1. The second direction D2 is along the downward direction in the vertical direction of the propeller propulsion system 1. The clockwise rotation direction when the output shaft 21 is viewed from the first direction D1 will be referred to as the rotation direction R1. The counterclockwise rotation direction when the output shaft 21 is viewed from the first direction D1 will be referred to as the rotation direction R2. In the following description, unless otherwise specified, the axial direction is the axial direction of the output shaft 21, the circumferential direction is the circumferential direction of the output shaft 21, and the radial direction is the radial direction of the output shaft 21.

[0016] The rotor 22 includes a cylinder 22a, a lid 22b, and a plurality of magnets 22d. The cylinder 22a and the lid 22b form a case. The rotor 22 rotates together with the output shaft 21 around the central axis Ax1.

[0017] The cylinder 22a is formed in a cylindrical shape around the output shaft 21, i.e., around the central axis Ax1. The cylinder 22a is made of a metal material or the like. The lid 22b is fixed to one end of the cylinder 22a in the axial direction. The lid 22b covers an opening at one end of the cylinder 22a.

[0018] The lid 22b has a protruding portion 21c. The protruding portion 21c protrudes in the first direction D1 from the center of the lid 22b. A through hole 22f is provided in the protruding portion 21c. The output shaft 21 is inserted into the through hole 22f. Furthermore, the protruding portion 21c is provided with four female screw portions 22e. The four female screw portions 22e are provided around the through hole 22f at intervals. Furthermore, the protruding portion 21c is provided with a hole 22r. A screw member (not shown) that fixes the protruding portion 21c and the output shaft 21 is inserted into the hole 22r.

[0019] The magnets 22d are fixed to the inner circumferential surface of the cylinder 22a at intervals from one another in the circumferential direction.

[0020] The stator 23 is located inside the rotor 22. The stator 23 is fixed to a support 24. The stator 23 has an iron core 23a and a winding (not shown) wound around the iron core 23a.

[0021] The support 24 is made of a metal material, etc. The support 24 is attached to a mounting portion (not shown) of the body of the flying object.

[0022] In the motor 2 configured as described above, the rotor 22 rotates integrally with the output shaft 21 when the windings of the stator 23 are energized.

[0023] [1-3. Propeller] Fig. 6 is a perspective view of the propeller 3 according to the first embodiment, as viewed from diagonally above the propeller 3. Fig. 7 is a perspective view of the propeller 3 according to the first embodiment, as viewed from diagonally below the propeller 3. Fig. 8 is an exploded perspective view of the propeller 3 according to the first embodiment, as viewed from diagonally above the propeller 3. Fig. 9 is a side view of a portion of the propeller 3 according to the first embodiment.

[0024] As shown in Figs. 6 to 8, the propeller 3 has a plurality of blades 31, a hub 32, and a plurality of fasteners 35. The plurality of blades 31 are fixed to the hub 32 by a plurality of fasteners 35. As an example, two blades 31 and two fasteners 35 are provided, but the number of blades 31 and fasteners 35 is not limited to this. In addition, as an example, the propeller 3 is formed by a combination of a plurality of members, but is not limited to this. For example, the propeller 3 may be formed by a single member.

[0025] The two blades 31 are located on opposite sides to each other with respect to the output shaft 21 (the central axis Ax1). The two blades 31 extend from a hub 32 in opposite directions to each other.

[0026] As shown in Figs. 7 to 9, the blade 31 has a main body 31a and protrusions 31d and 31e. The main body 31a generates a thrust by rotating. A through hole 31c is provided in one end 31b, which is the end of the main body 31a on the hub 32 side. The blade 31 may be made of a metal material, a synthetic resin material, or the like. The blade 31 may be made of carbon fiber or carbon fiber reinforced plastic, or may be made of a mixed material containing various materials. The blade 31 may be made of the same material overall, or may be made of different materials in parts.

[0027] 7 and 9, the protrusion 31e protrudes in the second direction D2 from the lower surface of the one end 31b of the main body 31a. The protrusion 31e is formed in an arc shape. The protrusion 31e abuts against the hub 32.

[0028] Fig. 10 is a plan view of a portion of a blade 31 of the propeller 3 according to the first embodiment. As shown in Fig. 8 and Fig. 10, the protrusion 31d protrudes from one end 31b of the main body 31a toward the center of the propeller 3. As shown in Fig. 10, the protrusion 31d is part of a gate portion 31f formed by a gate when the propeller 3 is made by injection molding. The gate portion 31f is cut at a drawn portion.

[0029] 8 and 9, the hub 32 has a lower hub member 33 and an upper hub member 34. With the two blades 31 sandwiched between the lower hub member 33 and the upper hub member 34, the lower hub member 33, the upper hub member 34 and the two blades 31 are fixed together by fasteners 35. One of the lower hub member 33 and the upper hub member 34 is also referred to as a first hub member, and the other of the lower hub member 33 and the upper hub member 34 is also referred to as a second hub member.

[0030] FIG. 11 is a perspective view of the central portion of the propeller 3 according to the first embodiment, and is a perspective view of the propeller 3 from diagonally below.

[0031] As shown in Figures 8, 9 and 11, the lower hub member 33 has an attachment portion 33a and a protruding portion 33b. The lower hub member 33 may be made of a metal material, a synthetic resin material, or the like. The lower hub member 33 may be made of carbon fiber or carbon fiber reinforced plastic, or may be made of a mixed material containing various materials. The lower hub member 33 may be made of the same material as a whole, or may be made of different materials in parts. The material of the lower hub member 33 may be selected as appropriate based on the required strength and rigidity, and cost.

[0032] The mounting portion 33a is formed in a band-like shape extending in a direction perpendicular to the central axis Ax1. The mounting portion 33a has an upper surface 33c, a lower surface 33d, and a peripheral surface 33e. The upper surface 33c faces the first direction D1. The lower surface 33d is the surface opposite the upper surface 33c and faces the second direction D2. The peripheral surface 33e extends between the upper surface 33c and the lower surface 33d.

[0033] The mounting portion 33a has two receiving portions 33i. The two receiving portions 33i are a portion on one side of the mounting portion 33a in the longitudinal direction from the center in the longitudinal direction, and a portion on the other side of the mounting portion 33a in the longitudinal direction from the center in the longitudinal direction. The receiving portions 33i are also referred to as supported portions.

[0034] As shown in Figs. 9 and 11, the receiving portion 33i is provided with a groove portion 33j. The groove portion 33j opens to the lower surface 33d and penetrates the mounting portion 33a in the circumferential direction. The groove portion 33j has a narrow portion 33ja and a wide portion 33jb. The narrow portion 33ja opens to the lower surface 33d. The wide portion 33jb is located on the first direction D1 side of the narrow portion 33ja and communicates with the narrow portion 33ja. A portion of the wide portion 33jb that protrudes beyond the narrow portion 33ja constitutes a groove portion 33jc. The groove portion 33jc opens toward the inside in the radial direction and penetrates the mounting portion 33a in the circumferential direction.

[0035] The receiving portion 33i has an inner surface 33k, an outer surface 33m, and a connecting surface 33n as surfaces forming the groove portion 33j. The inner surface 33k faces radially outward and extends in the circumferential and axial directions. The outer surface 33m is located radially outward of the inner surface 33k. A portion of the outer surface 33m faces radially inward and extends in the circumferential and axial directions. The connecting surface 33n faces the first direction D1 and connects the second direction end of the inner surface 33k and the second direction end of the outer surface 33m.

[0036] The outer surface 33m has surfaces 33ma, 33mb, 33mc, and 33r. The surface 33ma extends from the lower surface 33d in the first direction D1 and forms a narrow portion 33ja. The surface 33ma extends in an arc in the circumferential direction. The surface 33mb extends from the connecting surface 33n in the second direction D2 and forms a wide portion 33Jb. The surface 33mb extends in an arc in the circumferential direction. The surface 33mc connects the end of the surface 33ma in the first direction D1 and the end of the surface 33mb in the second direction D2. The surface 33mc faces the second direction D2 and extends in the circumferential direction. The surface 33r is connected to the end of the surface 33ma in the rotation direction R2. The surface 33r is a flat surface formed so as to move away from the central axis Ax1 as it moves toward the rotation direction R2. The surface 33r forms a recess in the propeller 3 that is recessed with respect to the surface 33ma.

[0037] The mounting portion 33a is provided with two female threaded portions 33h. Two grooves 33j are provided between the two female threaded portions 33h. The two female threaded portions 33h are coupled to a coupling 35.

[0038] As shown in FIG. 8, the protrusion 33b protrudes in the first direction D1 from the center of the upper surface 33c of the attachment portion 33a.

[0039] The lower hub member 33 is also provided with through holes 33f, 33g. The through hole 33f passes through the center of the lower hub member 33 in the axial direction. The protruding portion 21c of the output shaft 21 of the motor 2 is inserted into the through hole 33f (FIG. 3). Two through holes 33g are provided. The two through holes 33g pass through the lower hub member 33 in the axial direction. The through hole 33f is provided between the two through holes 33g. The lower hub member 33 is also provided with a recess 33p that communicates with the through hole 33g. The recess 33p is provided in the protruding portion 33b. The recess 33p opens to the upper surface and the circumferential surface of the protruding portion 33b. The protruding portion 31d of the blade 31 is inserted into the recess 33p (FIG. 3).

[0040] As shown in Figs. 8 and 9, the upper hub member 34 is formed in a strip shape extending in a direction perpendicular to the central axis Ax1. The upper hub member 34 may be made of a metal material, a synthetic resin material, or the like. The upper hub member 34 may also be made of carbon fiber or carbon fiber reinforced plastic, or may be made of a mixed material containing various materials. The upper hub member 34 may also be made of the same material as a whole, or may be made of different materials in parts. The material of the upper hub member 34 may be selected as appropriate based on the required strength and rigidity, and cost.

[0041] The upper hub member 34 is provided with through holes 34f, 34g, and 34h. The through hole 34f penetrates the center of the upper hub member 34 in the axial direction. The through hole 34f is connected to the through hole 33f of the lower hub member 33. The through hole 34f and the through hole 33f form a through hole 32f. The protruding portion 21c of the output shaft 21 of the motor 2 is inserted into the through hole 32f (FIG. 3). In other words, the protruding portion 21c of the output shaft 21 of the motor 2 is fitted into the through hole 32f. Two through holes 34g are provided. The two through holes 34g penetrate the upper hub member 34 in the axial direction. The through hole 34f is provided between the two through holes 34g. Two through holes 34h are provided. The two through holes 34h penetrate the upper hub member 34 in the axial direction. Through holes 34f and 34g are provided between the two through holes 34h. A plurality of fasteners 35 are inserted into the two through holes 34h (FIG. 3). The through hole 32f is an example of an opening. The opening may be a recess that is open in the second direction D2.

[0042] As shown in FIG. 3, the fastener 35 is a stepped male screw. The shaft of the fastener 35 has a large diameter portion 35a and a small diameter portion 35b. The large diameter portion 35a extends from the head of the fastener 35 in the second direction D2 and is inserted into the through hole 34h of the upper hub member 34 and the through hole 31c of the blade 31. A crush rib is provided in the through hole 31c facing the outer circumferential surface of the large diameter portion 35a, and the crush rib is crushed when the large diameter portion 35a is inserted into the through hole 34h and the through hole 31c. As a result, the large diameter portion 35a is press-fitted into the through hole 31c. Here, the through hole 34h and the through hole 31c have the same diameter. The small diameter portion 35b is a male screw portion and has a smaller diameter than the large diameter portion 35a. The small diameter portion 35b extends from the large diameter portion 35a in the second direction D2 and is coupled to the female thread portion 33h of the lower hub member 33.

[0043] Here, the rotation direction of the propeller 3 will be described. The propeller 3 has a rotation direction set. The rotation direction includes a rotation direction R1 and a rotation direction R2. The rotation direction set for the propeller 3 shown in Figs. 1 to 10 is the rotation direction R1. Fig. 12 shows a propeller whose set rotation direction is the rotation direction R2. Fig. 12 is a perspective view of the center of another propeller 3A according to the first embodiment, and is a perspective view of the other propeller 3A from an obliquely lower side. As can be seen from Figs. 11 and 12, the propeller 3 and the propeller 3A have different positions of the surface 33r of the mounting portion 33a. That is, the surface 33r of the propeller 3 is connected to one end of the surface 33ma in the rotation direction R2, whereas the surface 33r of the propeller 3A is connected to an end of the surface 33ma in the rotation direction R1. The mounting portion 33a of the propeller 3 and the mounting portion 33a of the propeller 3 are symmetrical with respect to a predetermined plane. The reason why the surface 33r of the mounting portion 33a of the propeller 3 and the propeller 3A is different in this manner is to prevent incorrect assembly with the propeller mounting device 4. The surface 33r is an example of a propeller side mating portion.

[0044] [1-4. Propeller mounting device] Fig. 13 is a perspective view of the propeller mounting device 4 according to the first embodiment, as viewed from diagonally above the propeller mounting device 4. Fig. 14 is an exploded perspective view of the propeller mounting device 4 according to the first embodiment, as viewed from diagonally above the propeller mounting device 4. Fig. 15 is a plan view of the propeller mounting device 4 according to the first embodiment. Fig. 16 is a bottom view of the propeller mounting device 4 according to the first embodiment.

[0045] As shown in Figures 13 to 16, the propeller mounting device 4 has a connecting body 40, a movable body 42, and a plurality of elastic bodies 43 (Figure 14). As shown in Figure 3, the propeller mounting device 4 is fixed to the motor 2 by a fastener 5. The fastener 5 is, for example, a male screw, and is coupled to the female screw portion 22e of the protruding portion 22c of the motor 2. The connecting body 40 is connected to the output shaft 21 via the protruding portion 22c, and rotates integrally with the output shaft 21.

[0046] As shown in Figs. 13 to 16, the connecting body 40 has a base 41 and a first receiving portion 45c. The base 41 is connected to the output shaft 21. The first receiving portion 45c allows the mounting portion 33a to be attached and detached by the rotation of the propeller 3 relative to the base 41 in the circumferential direction of the output shaft 21. The first receiving portion 45c limits the movement of the propeller 3 in the axial direction by receiving the mounting portion 33a in the axial direction of the output shaft 21. That is, the first receiving portion 45c receives an axial force from the propeller 3. The movable body 42 has a second receiving portion 42a. The movable body 42 is supported by the connecting body 40 so as to be movable in the axial direction between a detaching position (Fig. 2) and a limiting position (Figs. 1 and 3), and rotates integrally with the connecting body 40. The detaching position (Fig. 2) is a position where the movable body 42 allows the mounting portion 33a to be attached and detached to the first receiving portion 45c. The limiting position is a position further in the first direction D1 than the attachment / detachment position. The limiting position is a position where the second receiving portion 42a receives the mounting portion 33a attached to the first receiving portion 45c in the circumferential direction, thereby limiting the rotation of the propeller 3 in the circumferential direction relative to the base 41. That is, the second receiving portion 42a receives a circumferential force from the propeller 3. The elastic body 43 pushes the movable body 42 in the first direction D1, and rotates integrally with the connecting body 40. The first receiving portion 45c and the second receiving portion 42a are also referred to as support portions.

[0047] The propeller mounting device 4 will now be described in detail.

[0048] The connecting body 40 is configured by a combination of a plurality of members. Specifically, the connecting body 40 has a bayonet lower member 45 and a bayonet upper member 46. The term "bayonet" may be referred to as a propeller mounting device. The bayonet lower member 45 includes a part of the base 41 and the first receiving portion 45c, and is connected to the output shaft 21. The bayonet upper member 46 includes a part of the base 41 and is fixed to the bayonet lower member 45. The base 41 is configured by the part of the bayonet lower member 45 excluding the first receiving portion 45c and the entire bayonet upper member 46. The bayonet lower member 45 is an example of a first base member, and the bayonet upper member 46 is an example of a second base member.

[0049] The bayonet lower member 45 has a bottom wall 45a, a protruding portion 45b, two outer walls 45d, and a female screw portion 45e as parts that constitute the base 41. The bayonet lower member 45 is a separate member from the motor 2.

[0050] The bottom wall 45a is formed in a substantially circular ring shape around the central axis Ax1. A plurality of recesses 45m are formed in the bottom wall 45a. As an example, four recesses 45m are formed. The recesses 45m are open in the first direction D1.

[0051] The protruding portion 45b protrudes in the first direction D1 from the center of the bottom wall 45a. Through holes 45f, 45g are provided in the protruding portion 45b. The through hole 45f penetrates the center of the protruding portion 45b in the axial direction. The protruding portion 21c of the output shaft 21 of the motor 2 is inserted into the through hole 45f (FIG. 3). Two through holes 45g are provided. The two through holes 45g penetrate the protruding portion 45b in the axial direction. The through hole 45f is provided between the two through holes 45g. The coupling 5 (FIG. 3) is inserted into the through hole 45g.

[0052] The two female screw portions 45e are provided on the protruding portion 45b and are aligned in a direction perpendicular to the alignment direction of the two through holes 45g.

[0053] The bayonet lower member 45 may be made of a metal material, a synthetic resin material, or the like. The connector 40 may be made of carbon fiber or carbon fiber reinforced plastic, or may be made of a mixed material containing various materials. The bayonet lower member 45 may be made of the same material as a whole, or may be made of different materials in parts. For example, the bayonet lower member 45 has a plurality of portions 47, 48, and 49 made of different materials. The material of the bayonet lower member 45 may be appropriately selected based on the required strength and rigidity, and the cost.

[0054] As shown in Figs. 14 and 15, the bayonet upper member 46 is formed in a flat plate shape. The bayonet upper member 46 is located between the upper ends of the two outer walls 45d of the bayonet lower member 45. Through holes 46a and 46b are provided in the bayonet upper member 46. The through hole 46a is provided in the center of the bayonet upper member 46. The through hole 46a exposes the through holes 45f and 45g of the bayonet lower member 45. Two through holes 46b are provided. The through hole 46a is provided between the two through holes 46b. The bayonet upper member 46 is fixed to the bayonet lower member 45 by two fasteners 44. The fastener 44 is, for example, a male screw, and the fastener 44 is connected to the female screw portion 45e of the bayonet lower member 45 in a state where it is inserted into the through hole 46b of the bayonet upper member 46.

[0055] The bayonet upper member 46 may be made of a metal material, a synthetic resin material, or the like. The bayonet upper member 46 may be made of carbon fiber or carbon fiber reinforced plastic, or may be made of a mixed material containing various materials. The bayonet upper member 46 may be made of the same material as a whole, or may be made of different materials in parts. The material of the bayonet upper member 46 may be appropriately selected based on the required strength and rigidity, and the cost.

[0056] As shown in Figures 13 and 14, a plurality of first receiving portions 45c, specifically two, are provided. The number of first receiving portions 45c may be one or may be three or more. The two first receiving portions 45c are located on opposite sides to each other with respect to the output shaft 21. The two first receiving portions 45c extend in the first direction D1 from the bottom wall 45a of the bayonet lower member 45. Through holes 45f, 45g are provided between the two first receiving portions 45c.

[0057] The first receiving portion 45c has an extension portion 45h and a protrusion portion 45i. The extension portion 45h extends from the bottom wall 45a in the axial direction, specifically in the first direction D1. The protrusion portion 45i protrudes from the extension portion 45h to the outside in the radial direction of the output shaft 21. The mounting portion 33a of the propeller 3 is attached to the protrusion portion 45i.

[0058] The first receiving portion 45c has a surface 45j and a surface 45k. The surface 45j is a tip surface (upper surface) of the first receiving portion 45c and faces the first direction D1. The surface 45k is a lower surface of the protruding portion 45i and faces the second direction D2. As shown in FIG. 3, in a state in which the mounting portion 33a of the propeller 3 is attached to the first receiving portion 45c, the surface 45j faces the connection surface 33n of the mounting portion 33a in the axial direction, and the surface 45k faces the surface 33mc of the mounting portion 33a in the axial direction. The surface 45j abuts against the connection surface 33n in the axial direction, thereby restricting the movement of the propeller 3 in the axial direction, specifically, the movement in the second direction D2. The surface 45k abuts against the surface 33mc in the axial direction, thereby restricting the movement of the propeller 3 in the axial direction, specifically, the movement in the first direction D1.

[0059] 13 to 16, the movable body 42 has a plurality of, specifically, two, second receiving portions 42a and a connection portion 42b connecting the two second receiving portions 42a. The number of the second receiving portions 42a may be one or three or more.

[0060] The two second receiving portions 42a are located on opposite sides to each other with respect to the output shaft 21. The two second receiving portions 42a are aligned in the alignment direction of the two first receiving portions 45c. The second receiving portions 42a are provided for each first receiving portion 45c. The second receiving portions 42a, together with the corresponding first receiving portions 45c, constitute a support portion that supports the received portion 33i of the propeller 3. The two second receiving portions 42a are located outside the bayonet lower member 45 and the bayonet upper member 46.

[0061] The second receiving portion 42a has two claw portions 42c, 42d and a connecting portion 42e that connects the two claw portions 42c, 42d. The second receiving portion 42a also has a flat upper surface 42f. The upper surface 42f is provided on the two claw portions 42c, 42d and the connecting portion 42e.

[0062] The claw portion 42c is located adjacent to the first receiving portion 45c on the rotational direction R1 side of the first receiving portion 45c. The claw portion 42c is provided with a recess 42ce. The recess 42ce opens on the upper surface 42f and opens toward the rotational direction R2 and the radially outward direction. The claw portion 42c has faces 42ca, 42cb, and 42cd as faces forming the recess 42ce. The face 42ca is a plane facing the first direction D1. The face 42cb is a plane extending from the end of the face 42ca on the rotational direction R1 side in the first direction D1 and in a direction intersecting the rotational directions R1 and R2. The face 42cb faces the corresponding first receiving portion 45c. The face 42cd is a curved surface connected to the radially inner end of the face 42cb.

[0063] The claw portion 42d is located adjacent to the first receiving portion 45c on the rotational direction R2 side of the first receiving portion 45c. The claw portion 42d is provided with a recess 42de. The recess 42da opens to the upper surface 42f and opens toward the rotational direction R1 and the radially outward direction. The claw portion 42d has faces 42da, 42db, and 42dd as faces forming the recess 42de. The face 42da is a plane facing the first direction D1. The face 42db is a plane extending from the end of the face 42da on the rotational direction R2 side in the first direction D1 and in a direction intersecting the rotational directions R1 and R2. The face 42db faces the corresponding first receiving portion 45c. Therefore, the face 42db and the face 42cb face each other. The face 42dd is an inclined face connected to the radially inner end of the face 42db and inclined with respect to the face 42db. The first receiving portion 45c has a surface 42dd that forms a protrusion that protrudes from the surface 42db. The surface 42dd is an example of a mating portion.

[0064] When the mounting portion 33a of the propeller 3 is attached to the first receiving portion 45c, the surfaces 42cb and 42db face the peripheral surface 33e of the mounting portion 33a in the circumferential direction. The surface 42cb abuts against the peripheral surface 33e in the circumferential direction, thereby limiting the movement of the propeller 3 in the circumferential direction, specifically, the movement in the rotation direction R1. The surface 42db abuts against the peripheral surface 33e in the circumferential direction, thereby limiting the movement of the propeller 3 in the circumferential direction, specifically, the movement in the rotation direction R2.

[0065] The second receiving portion 42a has an inclined surface 42cf and an operation surface 42fa. The inclined surface 42cf is provided on the claw portion 42c and is connected to the upper surface 42f. The inclined surface 42cf is inclined with respect to the circumferential direction so as to approach the first direction D1 as it approaches the rotational direction R2.

[0066] The operation surface 42fa is provided on the claw portion 42d. The operation surface 42fa is configured by an area of ​​the claw portion 42d on the upper surface 42f. The operation surface 42fa faces the first direction D1 along the circumferential direction. The operation surface 42fa is flat.

[0067] Further, the second receiving portion 42a is guided in the axial direction by the extending portion 45h of the first receiving portion 45c. At this time, the second receiving portion 42a slides on the extending portion 45h.

[0068] 14, the connection portion 42b is located between the bayonet lower member 45 and the bayonet upper member 46. A through hole 42g is provided in the connection portion 42b. The protrusion 45b of the bayonet lower member 45 is inserted into the through hole 42g.

[0069] The movable body 42 may be made of a metal material, a synthetic resin material, or the like. The movable body 42 may also be made of carbon fiber or carbon fiber reinforced plastic, or may be made of a mixed material containing various materials. The movable body 42 may be made of the same material as a whole, or may be made of different materials in parts.

[0070] FIG. 17 is a cross-sectional view of a portion including the elastic body 43 in the propeller mounting device 4 according to the first embodiment. As shown in FIG. 14 and FIG. 17, the elastic body 43 is a coil spring. The elastic body 43 may be any body that generates elastic force, and may be, for example, a leaf spring. The elastic body 43 is interposed between the bottom wall 45a of the bayonet lower member 45 and the connection portion 42b of the movable body 42. The elastic body 43 pushes the movable body 42 in the first direction D1. The movable body 42 pushed in the first direction comes into contact with the bayonet upper member 46, and the movement in the first direction D1 is restricted. As a result, the second receiving portion 42a is held in the restricted position.

[0071] Two elastic bodies 43 are provided. The two elastic bodies 43 are placed in two of the four recesses 45m in the bottom wall 45a, which are located diagonally opposite each other. Specifically, the two elastic bodies 43 are placed in the two recesses 45m near the two operation surfaces 42fa among the four recesses 45m. The number of elastic bodies 43 is not limited to two. For example, four elastic bodies 43 may be provided and each of the elastic bodies 43 may be placed in the recess 45m. The number of elastic bodies 43 may be one or five or more. The elastic force of the elastic body 43 may be set so as to hold the second receiving portion 42a in the limit position even if an impact of a certain magnitude is applied to the propeller mounting device 4.

[0072] The movable body 42 configured as described above is moved from the restricted position to the detached position against the elastic force of the elastic body 43, for example, when the inclined surface 42cf is pressed by the propeller 3 rotating in the rotational direction R2 during attachment of the attachment portion 33a to the first receiving portion 45c. At this time, the elastic body 43 is compressed. The movable body 42 is moved from the detached position to the restricted position by the elastic force of the elastic body 43 when the propeller 3 no longer presses the inclined surface 42cf. The rotational direction R2 is an example of one side of the circumferential direction.

[0073] Here, the types of the propeller mounting device 4 will be described. The propeller mounting device 4 shown in Figs. 13 to 17 is for the propeller 3 shown in Figs. 1 to 10, whose set rotation direction is the rotation direction R1. Fig. 18 shows a propeller mounting device 4A for the propeller 3A (Fig. 12) whose set rotation direction is the rotation direction R2. Fig. 18 is a perspective view of another propeller mounting device 4A according to the first embodiment, as viewed from diagonally above the other propeller mounting device 4A. As can be seen from Figs. 13 and 18, the propeller mounting device 4 and the propeller mounting device 4A differ in at least the positions of the inclined surface 42cf and the operation surface 42fa. The lower hub member 33 and the upper hub member 34 have the same shape in the propeller mounting device 4 and the propeller mounting device 4A. The propeller mounting device 4 and the propeller mounting device 4A have symmetric shapes with respect to a predetermined plane. The surface 42dd of the propeller mounting device 4 can be combined with the surface 33r of the propeller 3, but cannot be combined with the surface 33r of the propeller 3A. On the other hand, the surface 42dd of the propeller mounting device 4A can be combined with the surface 33r of the propeller 3A, but cannot be combined with the surface 33r of the propeller 3.

[0074] [1-5. Operation] In the propeller propulsion system 1, when the output shaft 21 of the motor 2 rotates, the propeller mounting device 4 rotates integrally with the output shaft 21. At this time, the first receiving portion 45c of the propeller mounting device 4 receives the mounting portion 33a of the propeller 3 in the axial direction, thereby limiting movement of the propeller 3 in the axial direction. In addition, the second receiving portion 42a of the propeller mounting device 4 receives the mounting portion 33a attached to the first receiving portion 45c in the circumferential direction, thereby limiting rotation of the propeller 3 in the circumferential direction relative to the base 41. As a result, the propeller 3 rotates integrally with the output shaft 21 and the propeller mounting device 4.

[0075] [1-6. How to install and remove the propeller] Fig. 19 is a flowchart showing the process of attaching the propeller 3 according to the first embodiment. Fig. 20 and Fig. 21 are views showing the process of attaching the propeller 3 according to the first embodiment. Fig. 21 is a view showing a process subsequent to the attachment process of Fig. 20. In the propeller attachment method below, an example of a worker is shown as the work subject, but the work subject may also be an assembly device such as a robot.

[0076] As shown in Fig. 19, a worker performs an insertion step (S1). Specifically, as shown in Figs. 20 and 21, the worker inserts the protruding portion 21c of the propeller 3 protruding from the through-hole 45f of the base 41 of the propeller mounting device 4 assembled to the motor 2 into the through-hole 32f.

[0077] Next, as shown in Fig. 19, the worker performs the first moving step (S2). Specifically, the worker moves the second receiving portion 42a from the restricted position to the detached position against the elastic force of the elastic body 43. At this time, the worker rotates the propeller 3 with the output shaft 21 inserted in the through hole 32f in the circumferential direction (for example, the rotation direction R2) to push the inclined surface 42cf in the second direction D2 with the propeller 3, thereby moving the second receiving portion 42a from the restricted position to the detached position. As another example, the worker may push the operation surface 42fa in the second direction D2 with a finger to move the second receiving portion 42a from the restricted position to the detached position.

[0078] Next, the worker performs the rotation step (S3). Specifically, following the first movement step, the worker rotates the propeller 3 in the circumferential direction (for example, the rotation direction R2) to attach the mounting portion 33a to the second receiving portion 42a. Once the mounting portion 33a has been attached to the second receiving portion 42a, the second movement step is performed by the elastic body 43 (S4). Specifically, the elastic body 43 moves the second receiving portion 42a from the attachment / detachment position to the limiting position by the elastic force. As a result, the propeller 3 is attached to the output shaft 21 of the motor 2 via the propeller attachment device 4 (FIG. 1).

[0079] When removing the propeller 3 from the output shaft 21, the worker, for example, presses the operation surface 42fa with a finger in the second direction D2 to move the second receiving portion 42a from the limiting position to the detaching position. At this time, the elastic body 43 is compressed and deformed. Next, the worker rotates the propeller 3 in the circumferential direction to remove the mounting portion 33a from the first receiving portion 45c. As a result, the movable body 42 moves in the first direction D1 due to the elastic force of the elastic body 43, and the second receiving portion 42a moves from the limiting position to the detaching position. Next, the worker moves the propeller 3 in the first direction D1 to remove the propeller 3 from the output shaft 21.

[0080] [1-7.Effects] As described above, the propeller mounting device 4 of this embodiment has the connecting body 40, the movable body 42, and the elastic body 43. The connecting body 40 rotates integrally with the output shaft 21. The connecting body 40 has the base 41 and the first receiving portion 45c. The base 41 is provided with a through hole 45f into which the protruding portion 21c of the output shaft 21 including one end 21a of the output shaft 21 of the motor 2 is inserted, and is connected to the output shaft 21. The first receiving portion 45c allows the mounting portion 33a to be attached and detached by the rotation of the propeller 3 relative to the base 41 in the circumferential direction of the output shaft 21. The first receiving portion 45c limits the movement of the propeller 3 in the axial direction by receiving the mounting portion 33a in the axial direction of the output shaft 21. The movable body 42 has the second receiving portion 42a. The movable body 42 is supported by the connecting body 40 so as to be movable in the axial direction between a detachable position and a limiting position, and rotates integrally with the connecting body 40. The detachable position is a position where the movable body 42 allows the attachment portion 33a to be attached to and detached from the first receiving portion 45c. The limiting position is a position in a first direction D1 from the other end 21b to the one end 21a of the output shaft 21 along the axial direction of the output shaft 21, which is further from the detachable position. The limiting position is a position where the second receiving portion 42a receives the attachment portion 33a attached to the first receiving portion 45c in the circumferential direction, thereby restricting the rotation of the propeller 3 in the circumferential direction relative to the base 41. The elastic body 43 pushes the movable body 42 in the first direction D1, and rotates integrally with the connecting body 40. The propeller 3 has the attachment portion 33a. The propeller 3 is provided with a through hole 32f (opening) into which the protruding portion 21c of the output shaft 21 protruding from the through hole 45f is inserted.

[0081] As can be seen from the above, in the propeller mounting device 4 of this embodiment, the support part that supports the propeller 3 is separated into two receiving parts (the first receiving part 45c and the second receiving part 42a). The reason for separating the support part into two receiving parts in this manner is as follows. That is, in a configuration in which the support part is not separated into two, specifically, in a configuration in which the circumferential and axial movements of the propeller are limited by one receiving part (support part) made of an elastic member, the support part is susceptible to the effects of strong winds and the like. In detail, in a configuration in which the circumferential and axial movements of the propeller are limited by one receiving part, when the propeller is subjected to an axial load due to strong winds or the like, specifically, when a load in the direction in which the propeller is removed acts on the receiving part, the receiving part is likely to deform in the direction in which the propeller is removed from the receiving part. In contrast, in this embodiment, as described above, the support part that supports the propeller 3 is separated into two receiving parts (the first receiving part 45c and the second receiving part 42a). Therefore, even if an axial load due to a strong wind acts on the propeller 3, the load is received by the first receiving portion 45c, and the load is prevented from acting on the elastic body 43. This improves the mounting reliability of the propeller 3. Furthermore, the protruding portion 21c of the output shaft 21 is inserted into the through hole 32f of the propeller 3. Therefore, the propeller 3 can be accurately positioned relative to the output shaft 21 by contact between the circumferential surface that defines the through hole 32f in the propeller 3 and the protruding portion 21c of the output shaft 21. In other words, eccentricity of the propeller 3 relative to the output shaft 21 can be suppressed. This makes it possible to suppress the occurrence of vibration in the propeller 3.

[0082] In this embodiment, the movable body 42 has an inclined surface 42cf that is inclined with respect to the circumferential direction so as to move toward one side in the circumferential direction (rotation direction R2, as an example) toward the first direction D1. When the mounting portion 33a is attached to the first receiving portion 45c, the inclined surface 42cf is pressed by the propeller 3 rotating in the second direction D2, and the movable body 42 is moved from the limit position to the attachment / detachment position against the elastic force of the elastic body 43. When the inclined surface 42cf is no longer pressed by the propeller 3, the movable body 42 is moved from the attachment / detachment position to the limit position by the elastic force of the elastic body 43.

[0083] According to this configuration, by rotating the propeller 3 in the second direction D2 and pushing the inclined surface 42cf with the propeller 3, the second receiving portion 42a can be moved from the limiting position to the detachable position, and the mounting portion 33a of the propeller 3 can be attached to the first receiving portion 45c. Therefore, the mounting portion 33a of the propeller 3 can be easily attached to the first receiving portion 45c.

[0084] In this embodiment, the inclined surface 42cf is provided on the second receiving portion 42a.

[0085] According to such a configuration, it is easier to simplify the configuration of the propeller mounting device 4 compared to a configuration in which the inclined surface 42cf is provided separately from the second receiving portion 42a.

[0086] In this embodiment, the movable body 42 has a flat operation surface 42fa that extends along the circumferential direction and faces the first direction D1.

[0087] According to this configuration, by pressing the operation surface 42fa in the direction opposite to the first direction D1, the second receiving portion 42a can be moved from the restricting position to the attaching / detaching position.

[0088] In this embodiment, the operation surface 42fa is provided on the second receiving portion 42a.

[0089] According to such a configuration, it is easier to simplify the configuration of the propeller mounting device 4 compared to a configuration in which the operation surface 42fa is provided separately from the second receiving portion 42a.

[0090] Moreover, in this embodiment, the propeller mounting device 4 has a surface 42dd (mating portion). The propeller 3 has a set rotation direction (rotation direction R1 or R2). The mounting portion 33a has a surface 33r (propeller side mating portion) shaped according to the rotation direction. The surface 42dd can be combined with the surface 33r of the propeller 3 having a specified rotation direction. The surface 42dd cannot be combined with the surface 33r of the propeller 3A having a rotation direction opposite to the specified rotation direction.

[0091] According to such a configuration, it is possible to prevent a propeller 3A having a rotation direction opposite to the specified rotation direction from being erroneously attached to the propeller mounting device 4.

[0092] In this embodiment, the surface 42dd is provided on the second receiving portion 42a.

[0093] According to such a configuration, it is easier to simplify the configuration of the propeller mounting device 4 compared to a configuration in which the surface 42dd is provided separately from the second receiving portion 42a.

[0094] In this embodiment, the propeller mounting device 4 has a bayonet lower member 45 (first base member) and a bayonet upper member 46 (second base member). The bayonet lower member 45 includes a part of the base 41 and a first receiving portion 45c, and is connected to the output shaft 21. The bayonet upper member 46 includes a part of the base 41 and is fixed to the bayonet lower member 45. A part of the movable body 42 (connecting portion 42b) is located between the bayonet lower member 45 and the bayonet upper member 46. The second receiving portion 42a is located outside the bayonet lower member 45 and the bayonet upper member 46. The elastic body 43 is interposed between the bayonet lower member 45 and a part of the movable body 42 (connecting portion 42b).

[0095] According to such a configuration, the elastic body 43 can be easily protected by the bayonet lower member 45 and the bayonet upper member 46.

[0096] In this embodiment, the bayonet lower member 45 is a member separate from the motor 2.

[0097] According to such a configuration, the propeller mounting device 4 can be configured as a separate part from the motor 2, so that when the motor 2 is replaced, there is no need to replace the propeller mounting device 4.

[0098] In this embodiment, one of the mounting portion 33a and the first receiving portion 45c (for example, the first receiving portion 45c) has a protrusion 45i, and the other of the mounting portion 33a and the first receiving portion 45c (for example, the mounting portion 33a) has a groove 33jc in which the protrusion 45i is inserted and which extends in the circumferential direction. Note that the mounting portion 33a may have a protrusion, and the first receiving portion 45c may have a groove.

[0099] According to this configuration, the attachment portion 33a can be attached to the first receiving portion 45c by fitting the protrusion 45i into the groove 33jc.

[0100] In this embodiment, the first receiving portion 45c has a protrusion 45i. A groove 33jc is provided in the attachment portion 33a.

[0101] According to this configuration, it is easier to increase the strength and rigidity of the first receiving portion 45c compared to a configuration in which the groove portion 33jc is provided in the first receiving portion 45c.

[0102] In this embodiment, the first receiving portion 45c has an extending portion 45h and a protruding portion 45i. The extending portion 45h extends in the axial direction from the base 41. The protruding portion 45i protrudes from the extending portion 45h to the outside in the radial direction of the output shaft 21, and the mounting portion 33a is attached to the protruding portion 45i.

[0103] According to this configuration, the attachment portion 33a can be supported by the protrusion 45i.

[0104] In this embodiment, the extension portion 45h extends from the base 41 in the first direction D1 and guides the second receiving portion 42a in the axial direction.

[0105] According to this configuration, the second receiving portion 42a can be guided in the axial direction by the extension portion 45h.

[0106] In this embodiment, the first receiving portion 45c and the second receiving portion 42a are provided in plurality. The movable body 42 has the second receiving portions 42a and a connection portion 42b that connects the second receiving portions 42a.

[0107] According to such a configuration, the force acting from the propeller 3 to the propeller mounting device 4 can be more easily dispersed than in a configuration in which there is only one first receiving portion 45c and one second receiving portion 42a.

[0108] In this embodiment, two first receiving portions 45c and two second receiving portions 42a are provided. The two first receiving portions 45c are located on opposite sides to each other with respect to the output shaft 21. The two second receiving portions 42a are located on opposite sides to each other with respect to the output shaft 21.

[0109] According to such a configuration, the force acting on the propeller mounting device 4 from the propeller 3 can be received by the portions of the propeller mounting device 4 that are opposite to each other with respect to the output shaft 21 .

[0110] The propeller mounting device method of this embodiment uses the propeller mounting device 4 to mount the propeller 3 to the motor 2. The propeller mounting device method includes an insertion step, a first movement step, a rotation step, and a second movement step. In the insertion step, the protruding portion 21c of the propeller 3 protruding from the through hole 45f of the base 41 is inserted into the through hole 32f. In the first movement step, the second receiving portion 42a is moved from the limiting position to the detaching position against the elastic force of the elastic body 43. In the rotation step, the propeller 3 with the output shaft 21 inserted in the through hole 32f is rotated in the circumferential direction to attach the mounting portion 33a to the second receiving portion 42a. In the second movement step, the elastic body 43 moves the second receiving portion 42a from the detaching position to the limiting position.

[0111] Even if a load in the axial direction due to a strong wind acts on the propeller 3 attached to the output shaft 21 by such a propeller mounting method, the load is received by the first receiving portion 45c, and therefore the load is prevented from acting on the elastic body 43. Therefore, the mounting reliability of the propeller 3 can be improved.

[0112] [1-8. Reference example] FIG. 22 is a perspective view of a propeller propulsion system 101 of a reference example according to the first embodiment, as viewed from diagonally above the propeller propulsion system 101. FIG.

[0113] 22, the propeller propulsion system 101 is not provided with a propeller mounting device 4, and the propeller 3 is directly attached to the rotor 22 of the motor 2 by a fastener (not shown). The fastener is inserted into the through holes 33g, 34g of the propeller 3 and is coupled to the female screw portion 22e of the motor 2. With this configuration, the weight of the propeller propulsion system 101 can be reduced.

[0114] [2. Second embodiment] [2-1. Configuration of the propeller propulsion system according to the second embodiment] FIG. 23 is a perspective view of a portion of a propeller propulsion system 201 according to a second embodiment of the present disclosure, as viewed from diagonally above the propeller propulsion system 201.

[0115] 23 has a similar configuration to the propeller propulsion system 1. However, the propeller propulsion system 201 has a motor 202 and a propeller mounting device 204 instead of the motor 2 and the propeller mounting device 4.

[0116] [2-2.Motor and propeller mounting device] FIG. 24 is a perspective view of the motor 202 and the propeller mounting device 204 according to the second embodiment, and is a perspective view of the motor 202 and the propeller mounting device 204 from an obliquely upward direction. FIG. 25 is a perspective view of the motor 202 and the propeller mounting device 204 according to the second embodiment, and is a perspective view of the motor 202 and the propeller mounting device 204 from an obliquely downward direction. FIG. 26 is an exploded perspective view of the motor 202 and the propeller mounting device 204 according to the second embodiment, and is an exploded perspective view of the motor 202 and the propeller mounting device 4 from an obliquely upward direction. FIG. 27 is a perspective view of a part of the motor 202 and the propeller mounting device 4 according to the second embodiment, and is a perspective view of the motor 202 and the propeller mounting device 4 from an obliquely upward direction.

[0117] As shown in FIGS. 24 to 27, the motor 202 differs from the motor 2 in that it does not have the protruding portion 22c.

[0118] Moreover, the propeller attachment device 204 has a connector 240 instead of the connector 40. The connector 240 has a base 241 instead of the base 41. The bayonet lower member 45 of the base 241 is integrally formed with the lid 22b, which is a member of the rotor 22 of the motor 2. The propeller attachment device 204 and the lid 22b constitute an assembly. Furthermore, the arrangement direction of the through holes 45f, 45g of the base 241 is different from the arrangement direction of the through holes 45f, 45g of the base 41. Specifically, the arrangement direction of the through holes 45f, 45g of the base 241 is perpendicular to the arrangement direction of the two first receiving parts 45c. Furthermore, a hole 45n is provided in the base 241. A screw member (not shown) that fixes the bayonet lower member 45 and the output shaft 21 is inserted into the hole 45n.

[0119] [2-3. How to install and remove the propeller] The propeller mounting method and the propeller removal method using the propeller mounting device 204 configured as above are similar to the propeller mounting method and the propeller removal method using the propeller mounting device 4.

[0120] [2-4. Effects] As described above, in this embodiment, the bayonet lower member 45 (first base member) is integrally formed with the lid 22b (member) of the rotor 22 of the motor 2.

[0121] According to this configuration, compared to a configuration in which the bayonet lower member 45 is not integrally formed with the lid 22b of the rotor 22 of the motor 2, the bayonet lower member 45 can be easily thickened, and the strength and rigidity of the bayonet lower member 45 can be easily increased. This also makes it easier to reduce the hardness of the material of the bayonet lower member 45 and improve the workability of the bayonet lower member 45. This makes it possible to reduce costs. It also makes it easier to reduce the number of parts. It also makes it easier to suppress eccentricity of the propeller mounting device 204 and the propeller 3 relative to the motor 2.

[0122] [2-5. Modifications] FIG. 28 is a perspective view of a propeller propulsion system 301 according to a modified example of the first embodiment, as viewed from diagonally above the propeller propulsion system 301.

[0123] In this modified example, the propeller 3 is fixed to the rotor 22 of the motor 2 by a fastener (not shown) without passing through the first receiving portion 45c and the second receiving portion 42a.

[0124] It should be noted that the effects described in this specification are merely examples and are not limiting, and other effects may also be obtained.

[0125] The present technology can also be configured as follows. (1) a connecting body that rotates integrally with the output shaft, the connecting body comprising: a base that is provided with a through hole into which a protruding portion of an output shaft including one end of an output shaft of a motor is inserted and that is connected to the output shaft; a propeller that has an attachment portion and is provided with an opening into which the protruding portion protruding from the through hole is inserted, the attachment portion can be attached and detached by rotation of the propeller relative to the base in the circumferential direction of the output shaft, and a first receiving portion that receives the attachment portion in the axial direction of the output shaft to limit movement of the propeller in the axial direction; a movable body that has a second receiving portion, that is supported by the connecting body so as to be movable in the axial direction between an attachment / detachment position that allows attachment / detachment of the mounting portion to the first receiving portion, and a limiting position that is a position in a first direction from the other end of the output shaft toward the one end of the output shaft along the axial direction of the output shaft further than the attachment / detachment position, and that limits rotation of the propeller in the circumferential direction relative to the base by the second receiving portion receiving the mounting portion attached to the first receiving portion in the circumferential direction, and that rotates integrally with the connecting body; an elastic body that pushes the movable body in the first direction and rotates together with the connecting body; A propeller mounting device having a (2) The movable body has an inclined surface that is inclined with respect to the circumferential direction so as to approach the first direction as it approaches one side of the circumferential direction, and when the mounting part is attached to the first receiving part, the inclined surface is pressed by the propeller rotating toward one side of the circumferential direction, so that the movable body is moved from the limiting position to the detachment position against the elastic force of the elastic body, and when the inclined surface is no longer pressed by the propeller, the movable body is moved from the detachment position to the limiting position by the elastic force of the elastic body. (3) The propeller mounting device according to (2), wherein the inclined surface is provided on the second receiving portion. (4) The propeller mounting device according to any one of (1) to (3), wherein the movable body has a flat operation surface that faces the first direction along the circumferential direction. (5) The propeller mounting device according to claim 4, wherein the operating surface is provided on the second receiving portion. (6) It has a joint, The propeller has a rotation direction set, The mounting portion has a propeller side mating portion having a shape corresponding to the rotation direction, A propeller mounting device as described in any one of (1) to (5), wherein the mating portion can be combined with the propeller mating portion of the propeller having a specified rotational direction, but cannot be combined with the propeller side mating portion of the propeller having a rotational direction opposite to the specified rotational direction. (7) The propeller mounting device according to claim 6, wherein the mating portion is provided on the second receiving portion. (8) the connecting body includes a first base member including a portion of the base and the first receiving portion and connected to the output shaft, and a second base member including a portion of the first base member and fixed to the first base member, a portion of the movable body is located between the first base member and the second base member, the second receiving portion is located outside the first base member and the second base member, The propeller mounting device according to any one of (1) to (7), wherein the elastic body is interposed between a first base member and a part of the movable body. (9) The propeller mounting device according to (8), wherein the first base member is a separate member from the motor. (10) The propeller mounting device according to (8), wherein the first base member is integrally formed with a member of the rotor of the motor. (11) One of the attachment portion and the first receiving portion has a protrusion, The propeller mounting device according to any one of (1) to (10), wherein the other of the mounting portion and the first receiving portion is provided with a groove portion extending in the circumferential direction and into which the protrusion is inserted. (12) The first receiving portion has the protrusion, The propeller mounting device according to claim 11, wherein the mounting portion is provided with the groove portion. (13) The propeller mounting device according to any one of (1) to (12), wherein the first receiving portion has an extension portion extending from the base in the axial direction, and a protrusion portion protruding from the extension portion radially outward of the output shaft and to which the mounting portion is attached. (14) The propeller mounting device according to (13), wherein the extension portion extends from the base in the first direction and guides the second receiving portion in the axial direction. (15) The first receiving portion and the second receiving portion are each provided in a plurality of portions, The propeller mounting device according to any one of (1) to (14), wherein the movable body has the second receiving portions and a connection portion that connects the second receiving portions. (16) The first receiving portion and the second receiving portion are each provided in two pieces, The two first receiving portions are located on opposite sides of the output shaft, The propeller mounting device described in (15), wherein the two second receiving portions are located on opposite sides of the output shaft. (17) A method for mounting a propeller to a motor using a propeller mounting device, comprising the steps of: The propeller mounting device comprises: a connecting body that rotates integrally with the output shaft, the connecting body having: a base that is provided with a through hole into which a protruding portion of the output shaft including one end of the output shaft of a motor is inserted and that is connected to the output shaft; and a first receiving portion that receives the mounting portion in the axial direction of the output shaft by receiving the mounting portion in the axial direction of the output shaft, and that allows the mounting portion to be attached and detached by rotation of a propeller having an attachment portion and an opening into which the protruding portion protruding from the through hole is inserted, the first receiving portion being configured to receive the mounting portion in the axial direction of the output shaft and limit movement of the propeller in the axial direction; a movable body that has a second receiving portion, that is supported by the connecting body so as to be movable in the axial direction between an attachment / detachment position that allows attachment / detachment of the mounting portion to the first receiving portion, and a limiting position that is a position in a first direction from the other end of the output shaft toward the one end of the output shaft along the axial direction of the output shaft with respect to the attachment / detachment position, and that limits rotation of the propeller in the circumferential direction relative to the base by the second receiving portion receiving the mounting portion attached to the first receiving portion in the circumferential direction, and that rotates integrally with the connecting body; an elastic body that pushes the movable body in the first direction and rotates together with the connecting body; having an insertion step of inserting the protruding portion of the propeller protruding from the through hole of the base into the opening; a first moving step of moving the second receiving portion from the limiting position to the attachment / detachment position against the elastic force of the elastic body; a rotating step of rotating the propeller in the circumferential direction with the output shaft inserted into the opening to attach the mounting portion to the second receiving portion; a second moving step of moving the second receiving portion from the attachment / detachment position to the limiting position by an elastic force of the elastic body; A propeller mounting method including: (18) The movable body has an inclined surface that is inclined with respect to the circumferential direction so as to approach the first direction as it approaches one side of the circumferential direction, and when the mounting part is attached to the first receiving part, the inclined surface is pressed by the propeller rotating toward one side of the circumferential direction, so that the movable body is moved from the limiting position to the detachment position against the elastic force of the elastic body, and when the inclined surface is no longer pressed by the propeller, the movable body is moved from the detachment position to the limiting position by the elastic force of the elastic body. (19) The propeller mounting method according to (18), wherein the inclined surface is provided on the second receiving portion. (20) The propeller mounting method according to any one of (17) to (19), wherein the movable body has a flat operation surface that faces the first direction along the circumferential direction. (twenty one) The propeller mounting method according to (4), wherein the operating surface is provided on the second receiving portion. (twenty two) It has a joint, The propeller has a rotation direction set, The mounting portion has a propeller side mating portion having a shape corresponding to the rotation direction, The propeller mounting method according to any one of (17) to (21), wherein the mating portion can be combined with the propeller mating portion of the propeller having the specified rotational direction, but cannot be combined with the propeller side mating portion of the propeller having the rotational direction opposite to the specified rotational direction. (twenty three) The propeller mounting method according to (22), wherein the mating portion is provided on the second receiving portion. (twenty four) the connecting body includes a first base member including a portion of the base and the first receiving portion and connected to the output shaft, and a second base member including a portion of the first base member and fixed to the first base member, a portion of the movable body is located between the first base member and the second base member, the second receiving portion is located outside the first base member and the second base member, The propeller mounting method according to any one of (17) to (23), wherein the elastic body is interposed between a first base member and a part of the movable body. (twenty five) The propeller mounting method according to claim 24, wherein the first base member is a separate member from the motor. (26) The propeller mounting method according to (24), wherein the first base member is integrally formed with a member of the rotor of the motor. (27) One of the attachment portion and the first receiving portion has a protrusion, The propeller mounting method according to any one of (1) to (26), wherein the other of the mounting portion and the first receiving portion is provided with a groove portion extending in the circumferential direction and into which the protrusion is inserted. (28) The first receiving portion has the protrusion, The propeller mounting method according to claim 27, wherein the mounting portion is provided with the groove portion. (29) The propeller mounting method according to any one of (17) to (28), wherein the first receiving portion has an extension portion extending from the base in the axial direction and a convex portion protruding from the extension portion radially outward of the output shaft and to which the mounting portion is attached. (30) The propeller mounting method described in (29), wherein the extension portion extends from the base in the first direction and guides the second receiving portion in the axial direction. (31) The first receiving portion and the second receiving portion are each provided in a plurality of portions, The propeller mounting method according to any one of (17) to (30), wherein the movable body has the plurality of second receiving portions and a connection portion that connects the plurality of second receiving portions. (32) The first receiving portion and the second receiving portion are each provided in two pieces, The two first receiving portions are located on opposite sides of the output shaft, The propeller mounting method according to (31), wherein the two second receiving portions are located on opposite sides of the output shaft. [Explanation of symbols]

[0126] 2,202 Motor 3,3A Propeller 4,4A,204 Propeller mounting device 21 Output shaft 21a One end 21c Protrusion 22 Rotor 22b Lid (component) 32f Through hole (opening) 33a Mounting part 33jc Groove 33r surface (propeller side mating part) 40,240 Consolidated body 41,241 base 42 Movable body 42a 2nd Receiving Section 42b Connection 42cf slope 42dd surface (joint) 42fa Operation surface 43 Elastic Body 45 Bayonet lower part (first base part) 45c First Receptacle 45f through hole 45h Nobube 45i convex part 46 Bayonet upper part (second base part) D1 1st direction D2 2nd direction R1, R2 rotation direction S1 Insertion process S2 1st movement process S3 Rotation process S4 2nd movement process

Claims

1. a connecting body that rotates integrally with the output shaft, the connecting body comprising: a base that is provided with a through hole into which a protruding portion of an output shaft including one end of an output shaft of a motor is inserted and that is connected to the output shaft; and a first receiving portion that receives the mounting portion in the axial direction of the output shaft to limit movement of the propeller in the axial direction by receiving the mounting portion in the axial direction of the output shaft, the connecting body comprising: a base that is provided with a through hole into which a protruding portion of the output shaft is inserted and that is connected to the output shaft; a movable body that has a second receiving portion, that is supported by the connecting body so as to be movable in the axial direction between an attachment / detachment position that allows attachment / detachment of the mounting portion to the first receiving portion, and a limiting position that is a position in a first direction from the other end of the output shaft toward the one end of the output shaft along the axial direction of the output shaft further than the attachment / detachment position, and that limits rotation of the propeller in the circumferential direction relative to the base by the second receiving portion receiving the mounting portion attached to the first receiving portion in the circumferential direction, and that rotates integrally with the connecting body; an elastic body that pushes the movable body in the first direction and rotates together with the connecting body; A propeller mounting device having a

2. 2. The propeller mounting device according to claim 1, wherein the movable body has an inclined surface that is inclined with respect to the circumferential direction so as to approach the first direction as it approaches one side in the circumferential direction, and wherein when the mounting part is attached to the first receiving part, the inclined surface is pressed by the propeller rotating toward one side in the circumferential direction, so that the movable body is moved from the limiting position to the detachment position against the elastic force of the elastic body, and when the inclined surface is no longer pressed by the propeller, the movable body is moved from the detachment position to the limiting position by the elastic force of the elastic body.

3. The propeller mounting device according to claim 2 , wherein the inclined surface is provided on the second receiving portion.

4. The propeller mounting device according to claim 1 , wherein the movable body has a flat operating surface that faces the first direction along the circumferential direction.

5. The propeller mounting device according to claim 4 , wherein the operation surface is provided on the second receiving portion.

6. It has a joint, The propeller has a rotation direction set, The mounting portion has a propeller side mating portion having a shape corresponding to the rotation direction, 2. The propeller mounting device according to claim 1, wherein the mating portion is capable of being combined with the propeller mating portion of the propeller having a specified rotational direction, but is incapable of being combined with the propeller side mating portion of the propeller having a rotational direction opposite to the specified rotational direction.

7. The propeller mounting device according to claim 6 , wherein the mating portion is provided on the second receiving portion.

8. the coupling body includes a first base member including a portion of the base and the first receiving portion and coupled to the output shaft, and a second base member including a portion of the first base member and fixed to the first base member, a portion of the movable body is located between the first base member and the second base member, the second receiving portion is located outside the first base member and the second base member, The propeller mounting device according to claim 1 , wherein the elastic body is interposed between the first base member and a portion of the movable body.

9. 9. The propeller mounting arrangement of claim 8, wherein the first base member is a separate member from the motor.

10. 9. The propeller mounting device according to claim 8, wherein the first base member is integrally formed with a member of the rotor of the motor.

11. One of the attachment portion and the first receiving portion has a protrusion, The propeller mounting device according to claim 1 , wherein the other of the mounting portion and the first receiving portion is provided with a groove portion extending in the circumferential direction and into which the protrusion is inserted.

12. The first receiving portion has the protrusion, The propeller mounting device according to claim 11 , wherein the mounting portion is provided with the groove portion.

13. 2. The propeller mounting device according to claim 1, wherein the first receiving portion has an extension portion extending from the base in the axial direction, and a protrusion portion protruding from the extension portion radially outward of the output shaft and to which the mounting portion is attached.

14. The propeller mounting device according to claim 13 , wherein the extension portion extends in the first direction from the base and guides the second receiving portion in the axial direction.

15. The first receiving portion and the second receiving portion are each provided in a plurality of portions, The propeller mounting device according to claim 1 , wherein the movable body has the plurality of second receiving portions and a connection portion that connects the plurality of second receiving portions.

16. The first receiving portion and the second receiving portion are each provided in two pieces, The two first receiving portions are located on opposite sides of the output shaft, The propeller mounting device according to claim 15 , wherein the two second receiving portions are located on opposite sides of the output shaft.

17. A method for mounting a propeller to a motor using a propeller mounting device, comprising the steps of: The propeller mounting device comprises: a connecting body that rotates integrally with the output shaft, the connecting body comprising: a base that is provided with a through hole into which a protruding portion of the output shaft including one end of the output shaft of a motor is inserted and that is connected to the output shaft; and a first receiving portion that receives the mounting portion in the axial direction of the output shaft by receiving the mounting portion in the axial direction of the output shaft, and that allows the mounting portion to be attached and detached by rotation of a propeller having an attachment portion and an opening into which the protruding portion protruding from the through hole is inserted, the first receiving portion being configured to receive the mounting portion in the axial direction of the output shaft and limit movement of the propeller in the axial direction; a movable body that has a second receiving portion, that is supported by the connecting body so as to be movable in the axial direction between an attachment / detachment position that allows attachment / detachment of the mounting portion to the first receiving portion, and a limiting position that is a position in a first direction along the axial direction of the output shaft from the other end toward the one end of the output shaft with respect to the attachment / detachment position, and that limits rotation of the propeller in the circumferential direction relative to the base by the second receiving portion receiving the mounting portion attached to the first receiving portion in the circumferential direction, and that rotates integrally with the connecting body; an elastic body that pushes the movable body in the first direction and rotates together with the connecting body; having an insertion step of inserting the protruding portion of the propeller protruding from the through hole of the base into the opening; a first moving step of moving the second receiving portion from the limiting position to the attachment / detachment position against an elastic force of the elastic body; a rotating step of rotating the propeller in the circumferential direction with the output shaft inserted into the opening to attach the mounting portion to the second receiving portion; a second moving step of moving the second receiving portion from the attachment / detachment position to the limiting position by an elastic force of the elastic body; A propeller mounting method including:

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