Rotary device

Abstract

To provide a rotary device which is connected to a rotating member and assists efficient rotation of the member.SOLUTION: A rotary device includes: a fixed side component 30; and a rotary side component 20 which rotates relative to the fixed side component 30 and allows a rotated body coupled to the rotary side component 20 to rotate relative to the fixed side component 30. The rotary side component 20 has: an opening 21 which is open at a lower end; recessed parts 22 leading to the opening; and a circular column portion 24 extending from a center position of the recessed parts 22. The fixed side component 30 has: a hole part 31 which receives the circular column portion 24 of the rotary side component 20; and recessed part insertion parts 32 each of which is inserted into the recessed part 22. A tip of a cone shaped portion 25 of a tip of the circular column portion 24 contacts with a bottom surface of the hole part 31, and engagement between the recessed parts 22 of the rotary side component 20 and the recessed part insertion parts 32 of the fixed side component 30 restricts the circular column portion 24 from shifting from a gravity direction.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a rotating device that assists the rotation of a rotating body.

Background Art

[0002] Rotating members are included in many products such as automobiles, toys, and electrical appliances. For example, as shown in FIG. 8, Patent Document 1 below describes a fan 1 in which an impeller 3 rotates to blow air 360 degrees in the horizontal direction. This fan 1 houses an electric motor and a rotating shaft that transmits the rotational force thereof to the impeller 3 inside a stand 2. The impeller 3 is made of a wire mesh and covered with a guard portion 4.

[0003] When the contact area at the location where the contact load is applied between the rotating member and the fixed member is large, the rotation efficiency of the rotating member decreases. Also, when a deviation occurs in the rotation center or rotation angle of the rotating shaft during rotation, it is known that the rotating shaft sways, resulting in impaired quietness or deteriorated rotation efficiency.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of the present invention is to provide a rotating device that connects to a rotating member and realizes efficient rotation as a rotation mechanism of the member.

Means for Solving the Problems

[0006] The present invention relates to a rotating device having a first component and a second component that rotates relative to the first component, and enabling a rotatable body coupled to the second component to rotate relative to the first component. The second component includes an opening that opens at the lower end, a recess that is continuous with the opening and has a space portion with a larger area than the opening, and a cylindrical portion that extends downward through the opening from the central position of the recess. The first component has a hole portion that receives the cylindrical portion of the second component and a recess insertion portion that is inserted into the space portion of the recess. Further, the tip of the conical portion provided at the tip of the cylindrical portion of the second component contacts the bottom surface of the hole portion of the first component directly or via a bearing, and the misalignment of the cylindrical portion in the gravitational direction is restricted by the engagement between the recess of the second component and the recess insertion portion of the first component.

[0007] In this rotating device, the weight of the rotatable body is supported by the tip of the cylindrical portion of the second component that contacts the bottom surface of the hole portion of the first component. Since a conical shape is formed at this tip, the contact area with the bottom surface of the hole portion of the first component is small. Therefore, high rotational efficiency can be maintained. Further, the engagement between the recess of the second component and the recess insertion portion of the first component suppresses the occurrence of shaking of the cylindrical portion, so that it is possible to prevent the situation where the contact position between the conical shape at the tip of the cylindrical portion and the bottom surface of the hole portion of the first component is displaced or the cylindrical portion is tilted.

[0008] Further, in this rotating device, the first component and the second component are formed of metal.

[0009] Also, the conical portion of the second component formed of metal may be surrounded by lubricating oil. By doing so, it is possible to reduce the friction between the conical portion of the second component and the bottom surface of the hole portion of the first component, prevent wear, and suppress the generation of frictional heat.

[0010] Further, in this rotating device, the first component and the second component may be formed of synthetic resin.

[0011] Also, in this case, the conical portion of the second part formed of synthetic resin may be covered with metal.

[0012] Further, a plurality of vent holes communicating with the outside may be provided in a portion of the first part surrounding the conical portion of the second part. By doing so, the frictional heat generated between the conical portion of the second part and the bottom surface of the hole portion of the first part can be released from these vent holes.

[0013] Also, the bearing installed on the bottom surface of the hole portion of the first part includes a single small-diameter spherical rolling element disposed at the center and a plurality of spherical rolling elements disposed around the spherical rolling element and having a diameter larger than that of the spherical rolling element. When the cylindrical portion of the second part rotates, the small-diameter spherical rolling element of the bearing abuts against the tip of the cylindrical portion of the second part (the center position of the conical portion) and rolls, and the plurality of large-diameter spherical rolling elements abut against the inclined surface of the conical portion and roll. In this way, since all of the small-diameter spherical rolling element and the large-diameter spherical rolling elements of the bearing roll simultaneously, the friction during rotation is reduced, and smooth rotation becomes possible.

Effect of the Invention

[0014] The rotating device of the present invention can support a rotating member and realize efficient rotation of the member.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0016] Hereinafter, embodiments of the present invention will be described based on examples.

[0017] FIG. 1 shows a state in which the rotating device 10 in the example is used in the electric fan 1. This electric fan 1 has a structure in which the impeller 3 covered by the guard part 4 rotates and can blow air 360 degrees in the horizontal direction. From below the electric fan 1, the rotating shaft 5 of the impeller 3 protrudes, and the lower end of the rotating shaft 5 is coupled to the rotating device 10 of the present invention.

[0018] Further, a bevel gear 51 is fixed to the rotating shaft 5, and this bevel gear 51 meshes with a bevel gear 62 coupled to the rotating shaft 61 of the motor 60, causing the impeller 3 to rotate.

[0019] As shown in FIG. 2(a), the rotating device 10 is composed of a rotating side component 20 (the "second component" referred to in the claims) and a fixed side component 30 (the "first component" referred to in the claims). The fixed side component 30 is fixed, and the rotating side component 20 is rotatable with respect to the fixed side component 30.

[0020] The rotating side component 20 is shown in FIGS. 2(b-1) and (b-2), and the fixed side component 30 is shown in FIGS. 2(c-1) and (c-2). The rotating side component 20 has a recess 23 composed of an opening 21 opening at the lower end and a space portion 22 continuous with the opening 21, and further has a cylindrical portion 24 extending downward through the opening 21 from the center position of the recess 23. A conical portion 25 is provided at the tip of the cylindrical portion 24. The space portion 22 of the recess 23 has an area larger than that of the opening 21.

[0021] On the other hand, the fixed-side component 30 of the rotating fitting 10 has a hole portion 31 for receiving the cylindrical portion 24 of the rotating-side component 20 and a recess insertion portion 32 to be inserted into the space portion 22 of the recess 23 of the rotating-side component 20.

[0022] When the fixed-side component 30 and the rotating-side component 20 of the rotating device 10 are combined, as shown in FIG. 2(a), the tip of the conical portion 25 provided at the tip of the cylindrical portion 24 of the rotating-side component 20 contacts the bottom surface of the hole portion 31 of the fixed-side component 30. Further, the recess insertion portion 32 of the fixed-side component 30 enters the space portion 22 of the recess 23 of the rotating-side component 20, and the position of the rotating-side component 20 with respect to the fixed-side component 30 is restricted.

[0023] In order to combine the fixed-side component 30 and the rotating-side component 20 in the state of FIG. 2(a), it is necessary to make each of the fixed-side component 30 and the rotating-side component 20 a combined body of a plurality of components.

[0024] FIG. 3 shows, as an example, a case where the fixed-side component 30 is divided into 30(1) and 30(2) at the dotted line positions, the rotating-side component 20 is divided into 20(1) and 20(2) at the dotted line positions, the divided components are arranged at the positions indicated by the arrows, and then each of the fixed-side component 30 and the rotating-side component 20 is recombined to obtain the state of FIG. 2(a).

[0025] The contact resistance between the tip of the conical portion 25 provided on the cylindrical portion 24 of the rotating-side component 20 and the bottom surface of the hole portion 31 of the fixed-side component 30 is small. Therefore, the rotating shaft 5 of the blower 1 fixed to the rotating-side component 20 of the rotating device 10 can rotate with high rotational efficiency and can rotate at high speed.

[0026] Further, the recess 23 of the rotating-side component 20 of the rotating device 10 and the recess insertion portion 32 of the fixed-side component 30 are engaged to prevent the rotating shaft 24 fixed to the rotating-side component 20 from rotating in a state deviated from the gravitational direction. Therefore, the rotating shaft 5 of the fan 1 can rotate in a stable state.

[0027] Note that the fixed-side component 30 and the rotating-side component 20 of the rotating device 10 can be formed of metal, synthetic resin, or the like.

[0028] Further, when the fixed-side component 30 and the rotating-side component 20 of the rotating device 10 are formed of metal, as shown in FIG. 4, the tip of the cylindrical portion 24 of the rotating-side component 20 may be surrounded by lubricating oil 80. By doing so, the friction between the conical portion 25 at the tip of the cylindrical portion 24 and the bottom surface of the hole portion 31 of the fixed-side component 30 can be reduced, wear can be prevented, and the generation of frictional heat can be suppressed.

[0029] Further, when the fixed-side component 30 and the rotating-side component 20 are formed of synthetic resin, as shown in FIG. 5, the conical portion 25 at the tip of the cylindrical portion 24 of the rotating-side component 20 may be covered with metal 71 to reinforce the mechanical strength of this portion 25.

[0030] Also, as shown in FIG. 6, a plurality of vent holes 33 communicating with the outside are provided in the vicinity of the bottom surface of the hole portion 31 of the fixed-side component 30 (that is, the portion surrounding the conical portion 25 at the tip of the cylindrical portion 24), and the frictional heat generated between the conical portion 25 and the bottom surface of the hole portion of the fixed-side component 30 may be allowed to escape through these vent holes 33.

[0031] Also, as shown in FIGS. 7(a) and 7(b), a bearing 81 may be disposed on the bottom surface of the hole portion 31 of the fixed-side component 30, and the tip of the cylindrical portion 24 of the rotating-side component 20 may be received by the bearing 81. As shown in FIG. 7(b), this bearing 82 has a plurality of large-diameter spherical rolling elements 83 annularly arranged inside a cylindrical outer ring 82, and one small-diameter spherical rolling element 84 is disposed at the center of the ring.

[0032] As shown in Fig. 7(a), this small-diameter spherical rolling element 84 abuts against the tip of the rounded cylindrical portion 24 (the center position of the conical portion 25), and a plurality of large-diameter spherical rolling elements 83 abut against the inclined surface of the conical portion 25 existing around its center position.

[0033] In this way, when the bearing 81 receives the tip of the cylindrical portion 24 of the rotating-side component 20, when the cylindrical portion 24 rotates, all of the small-diameter spherical rolling elements 84 and large-diameter spherical rolling elements 83 of the bearing 81 rotate simultaneously, so the friction during rotation is reduced and smooth rotation becomes possible.

[0034] Here, an example of rotating the fan 1 using the rotating device 10 has been shown, but the rotating device 10 of the present invention can be used as a rotating mechanism for various rotating components.

Industrial Applicability

[0035] The rotating device of the present invention can be used as a rotating mechanism for rotating components in various industrial fields.

Explanation of Reference Numerals

[0036] 1 Fan 3 Impeller 4 Guard part 5 Rotating shaft 10 Rotating device 20 Rotating-side component 21 Opening 22 Space part 23 Recess 24 Cylindrical portion 25 Conical portion 30 Fixed-side component 31 Hole 32 Recess insertion part 33 Vent hole 51 Bevel gear 60 Motor 61 Rotating shaft 62 Bevel gear 71 Coating metal 80 Lubricating oil 81 Bearing 82 Bearing outer ring 83 large-diameter spherical rolling elements 84 small-diameter spherical rolling elements

Claims

1. A rotating device having a first part and a second part rotatable relative to the first part, and enabling rotation of a rotator coupled to the second part relative to the first part, wherein the second part has an opening at a lower end, and a recess having a space portion with an area wider than the opening and continuous with the opening, and a cylindrical portion extending downward through the opening from a central position of the recess, the first part has a hole for receiving the cylindrical portion of the second part and a recess insertion portion inserted into the space portion of the recess, a tip of a conical portion provided at a tip of the cylindrical portion of the second part contacts a bottom surface of the hole of the first part directly or via a bearing, and a deviation of the cylindrical portion in the direction of gravity is restricted by engagement between the recess of the second part and the recess insertion portion of the first part.

2. The rotating device according to claim 1, wherein the first part and the second part are formed of metal.

3. The rotating device according to claim 2, wherein the conical portion of the second part is surrounded by lubricating oil.

4. The rotating device according to claim 1, wherein the first part and the second part are formed of synthetic resin.

5. The rotating device according to claim 4, wherein the conical portion of the second part is covered with metal.

6. The rotating device according to claim 1, wherein a plurality of ventilation holes communicating with the outside are provided in a portion of the first part surrounding the conical portion of the second part.

7. The rotary device according to claim 1, wherein the bearing includes a single small-diameter spherical rolling element disposed at the center and a plurality of spherical rolling elements disposed around the spherical rolling element and having a diameter larger than that of the spherical rolling element.

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