Rotation mechanism of rotating body

Abstract

To provide a rotation mechanism which achieves high rotation efficiency of a rotating body.SOLUTION: A rotation mechanism of a rotating body includes: a disc-like member 60 fixed to a rotary shaft 12; and engagement members 70 each configured to engage with an outer peripheral portion of the disc-like member. The disc-like member has inclined surfaces 61, 62 which move close to each other so as to reduce a thickness of the disc-like member in a direction toward the outer peripheral portion. The engagement member includes: pairs of spheres each of which is formed by arranging two spheres 71 (1), 71 (2), contacting with each other, in a direction parallel to the rotary shaft; and an annular frame 73 including a ring-shaped storage space for housing the pairs of spheres. The annular frame has, at the inner peripheral side, an insertion port for inserting the inclined surfaces of the disc-like member into the storage space. A part of the inclined surface of the disc-like member inserted into the storage space contacts with the two spheres. The pairs of spheres 71 (1), 71 (2) roll on the inclined surfaces 61, 62 and upper and lower surfaces of the annular frame 73 without slipping and thus have small friction resistance.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a rotation mechanism that efficiently rotates a rotating body such as a motor or a generator. [Background technology]

[0002] The following patent document describes a motor that includes a rotor 11 that rotates around a rotation axis 12, and a cylindrical container 30 that rotatably houses the rotor 11, as shown in FIG. 10(a).

[0003] As shown in Figure 10(c), disk-shaped parts 20 are attached to the upper and lower sides of the rotor 11 on the rotating shaft 12, while engagement portions 40 that engage with each disk-shaped part 20 are arranged inside the container 30, as shown in Figure 10(b).

[0004] 11, the periphery of the disk-shaped part 20 is surrounded by an annular body 21 having a triangular cross section. The annular body 21 is integrated with the disk-shaped part 20 so that one apex of the triangular cross section protrudes and the other two apexes are connected to the periphery of the disk-shaped part 20.

[0005] On the other hand, the engaging portion 40 disposed on the container 30 is formed with a recess 41 for receiving the protruding apex of the annular body 21 . Therefore, the rotating shaft 12 rotates with the apex of the annular body 21 in contact with the recess 41 of the engagement portion 40.

[0006] This motor is configured with a cylindrical rotor 11, which is made up of a semi-cylindrical permanent magnet 11(a) with an S pole on the top and an N pole on the bottom, combined with a semi-cylindrical permanent magnet 11(b) with an N pole on the top and an S pole on the bottom. A plurality of coils 50 are arranged on the inner surface of the container 30 facing the rotor 11. The rotor 11 rotates by controlling the current supplied to the coils 50.

[0007] As such, there are many devices in which a rotor rotates inside a container. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent No. 7469838 Summary of the Invention [Problem to be solved by the invention]

[0009] In the rotation mechanism of Patent Document 1, the contact area between the disk-shaped part 20 fixed to the rotating shaft 12 and the engagement part 40 fixed to the container 30 is reduced, thereby reducing the sliding friction force between the disk-shaped part 20 and the engagement part 40 and increasing the rotation efficiency of the rotating shaft 12.

[0010] However, since the contact between the disk-shaped part 20 and the engaging portion 40 is a sliding contact, there is a limit to how small the coefficient of friction can be made, and it is difficult to sufficiently increase the rotational efficiency of the rotating shaft 12. An object of the present invention is to provide a rotation mechanism that can further increase the rotation efficiency of a rotating body. [Means for solving the problem]

[0011] The present invention provides a rotation mechanism that supports the rotation of a rotating body having a rotating shaft within a container, and includes: a disk-shaped member fixed to two locations on the rotating shaft with the rotating body sandwiched therebetween; and an engaging member disposed on the inner wall of the container and engaging with the outer periphery of the disk-shaped member. The disk-shaped member has inclined surfaces that approach each other so that the thickness of the disk-shaped member decreases toward the outer periphery. The engaging member also includes sphere pairs in which two contacting spheres are arranged in a direction parallel to the extension direction of the rotating shaft, and an annular frame having a ring-shaped storage space that accommodates a plurality of the sphere pairs. The annular frame has an insertion opening on its inner periphery for inserting the inclined surface of the disk-shaped member into the storage space. When the disk-shaped member is inserted into the storage space through the insertion opening, a portion of the inclined surface contacts each of the two spheres that make up the sphere pair.

[0012] In this rotation mechanism, when the rotating shaft rotates, the disk-shaped member fixed to the rotating shaft rotates, and the pair of spheres of the engaging member that contact the inclined surface of the disk-shaped member roll without slipping within the accommodation space of the engaging member. Because the coefficient of friction of this rolling contact between the inclined surface and the pair of spheres is smaller than that of sliding contact, the rotation efficiency of the rotating body is improved.

[0013] In the rotation mechanism of the present invention, three or more pairs of spheres are accommodated in the accommodation space of the annular frame. This allows the rotation shaft to rotate stably relative to the container. [Effects of the Invention]

[0014] The rotation mechanism of the present invention enables efficient rotation of a rotating body fixed to a rotation shaft. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 3 is a cross-sectional view of a disk-shaped member and an engaging member according to an embodiment of the present invention. [Figure 2] FIG. 4 is a diagram showing components that form the annular frame of the engagement member. [Figure 3] 10 is a cross-sectional view showing the state in which the first sphere of the sphere pair is placed on the lower member of the annular frame. FIG. [Figure 4] 4 is a cross-sectional view showing a state in which a disk-shaped member fixed to a rotating shaft is superimposed on the state shown in FIG. 3; [Figure 5] 5 is a cross-sectional view showing the state in which the second sphere of the sphere pair is superimposed on the state shown in FIG. 4. [Figure 6] FIG. 4 is a plan view of the state of FIG. 3 seen from above. [Figure 7] FIG. 5 is a plan view of the state of FIG. 4 seen from above. [Figure 8] FIG. 6 is a plan view of the state of FIG. 5 seen from above. [Figure 9] FIG. 3 is a plan view of the state of FIG. 2 seen from above. [Figure 10] FIG. 1 is a diagram showing a motor described in Patent Document 1. [Figure 11] FIG. 11 is a diagram showing the rotation mechanism of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of the rotation mechanism of the present invention will be described.

[0017] The disk-shaped member 60 in the rotation mechanism of the present invention is fixed to the rotating shaft 12 to which the rotor 11 is fixed at two points, one above the rotor 11 and one below the rotor 11, similar to the disk-shaped part 20 (Figure 10C) of the rotation mechanism of Patent Document 1. Furthermore, the engaging members 70 in the rotation mechanism of the present invention are arranged at two locations inside the container 30 that houses the rotor 11, where they engage with the disk-shaped members 60, similar to the engaging portions 40 (Figure 10b) of the rotation mechanism of Patent Document 1.

[0018] 1, the disk-shaped member 60 has ring-shaped inclined surfaces 61 and 62 that approach each other so that the thickness of the disk-shaped member 60 becomes thinner as it approaches the outer periphery. In this specification, the portions of the ring-shaped inclined surfaces 61 and 62 are referred to as the "portions near the outer periphery" of the disk-shaped member 60.

[0019] On the other hand, the engaging member 70 has a pair of spheres 71(1) and 71(2) that contact the inclined surfaces 61 and 62 that form the portion near the outer periphery of the disk-shaped member 60, and a ring-shaped annular frame 73 that forms a storage space for the spheres 71(1) and 71(2). The spheres 71(1) and 71(2) are arranged in the annular frame 73 in a direction parallel to the extension direction of the rotation shaft 12 and are in contact with each other. In addition, the ring-shaped annular frame 73 has an insertion opening on the inner periphery into which the portion of the disk-shaped member 60 near the outer periphery is inserted, and the tip of the portion of the disk-shaped member 60 near the outer periphery inserted into the storage space of the annular frame 73 from this insertion opening comes into contact with the spheres 71(1) and 71(2).

[0020] As shown in FIG. 2, the annular frame 73 of the engaging member 70 is composed of a lower frame 73(1) and an upper frame 73(2) so that the disk-shaped member 60 fixed to the rotating shaft 12 and the engaging member 70 can be combined in the state shown in FIG. 1. Figure 8 shows a plan view when the upper frame 73(2) of Figure 2 is removed. In this figure, the sphere 71(1) is hidden under the sphere 71(2).

[0021] FIG. 8 shows four pairs of spheres 71(1) and spheres 71(2) that are arranged at equal intervals on a ring of the lower frame 73(1). In order to stabilize the rotation of the rotating shaft 12 to which the disk-shaped member 60 is fixed, three or more pairs of the spheres 71(1) and 71(2) must be provided within the ring of the annular frame 73.

[0022] Figure 3 shows a cross-sectional view of the state in which sphere 71(1) of the pair of spheres is placed on the ring of lower frame 73(1), and Figure 6 shows a plan view of this state.

[0023] Next, as shown in Fig. 4, the rotating shaft 12 to which the disk-shaped member 60 is fixed is placed so that the inclined surface 62 near the outer periphery of the disk-shaped member 60 comes into contact with the sphere 71(1) in the state shown in Fig. 3. Fig. 7 shows a plan view thereof. At this time, the upper frame 73(2) is retracted above the rotary shaft 12 with the rotary shaft 12 inserted through its central hole in advance.

[0024] Next, as shown in Fig. 5, a sphere 71(2) is placed so as to be in contact with the inclined surface 61 of the disk-shaped member 60 in the state shown in Fig. 4. Fig. 8 shows a plan view thereof.

[0025] Next, as shown in Fig. 2, the upper frame 73(2) that has been retracted above the rotary shaft 12 is coupled to the lower frame 73(1). Fig. 9 shows a plan view thereof.

[0026] The pair of spheres 71(1), 71(2) housed in the annular frame 73 consisting of the upper frame 73(2) and the lower frame 73(1) come into contact with each other and also with the tip of the portion near the outer periphery of the disk-shaped member 60. Furthermore, the sphere 71(1) also comes into contact with the bottom surface of the lower frame 73(1), and the sphere 71(2) also comes into contact with the ceiling surface of the upper frame 73(2).

[0027] When the rotating shaft 12 rotates and the disk-shaped member 60 rotates, the spheres 71(1) and 71(2) that contact the tips of the portions near the outer periphery of the disk-shaped member 60 roll within the ring-shaped annular frame 73 without slipping. At this time, the contact between the portion of the disk-shaped member 60 near the outer periphery and the spheres 71(1) and 71(2) is rolling contact, and the mutual contact between the spheres 71(1) and 71(2), the contact between the spheres 71(1) and the bottom surface of the lower frame body 73(1), and the contact between the spheres 71(2) and the ceiling surface of the upper frame body 73(2) are also rolling contacts. Therefore, the friction resistance is extremely small compared to sliding contact, allowing the rotating shaft to rotate efficiently.

[0028] Although sliding contact occurs between the inner surface of the annular frame 73, which is parallel to the arrangement direction of the spheres 71(1) and 71(2), and the spheres 71(1) and 71(2), the contact area between the spheres and the flat surface is small, so no significant frictional resistance occurs. [Industrial Applicability]

[0029] The rotation mechanism of the present invention can be widely used in many rotating bodies such as generators and motors. [Explanation of symbols]

[0030] 11 Rotor 11(a) Permanent magnets 11(b) Permanent magnet 12 Rotation axis 20 Disc-shaped parts 21 cyclic bodies 30 Cylindrical container 40 Engagement portion 41 Recess 50 coils 60 Disk-shaped member 61 Inclined surface (near the periphery) 62 Inclined surface (near the periphery) 70 Engagement member 71(1) Sphere 71(2) Sphere 73 Annular frame 73(1) Lower frame 73(2) Upper frame

Claims

1. A rotation mechanism that supports the rotation of a rotating body having a rotation shaft within a container, a disk-shaped member fixed to two locations on the rotating shaft with the rotating body interposed therebetween; an engaging member disposed on the inner wall of the container and engaging with an outer circumferential portion of the disk-shaped member; Equipped with the disk-shaped member has inclined surfaces that approach each other so that the thickness of the disk-shaped member becomes thinner as it approaches the outer periphery, The engaging member is a pair of spheres in which two spheres in contact with each other are arranged in a direction parallel to the extension direction of the rotation axis; an annular frame including a ring-shaped accommodation space for accommodating a plurality of the spherical body pairs, the annular frame including an insertion opening on an inner circumferential side for inserting the inclined surface of the disk-shaped member into the accommodation space; Equipped with A rotation mechanism in which a portion of the inclined surface of the disk-shaped member inserted into the storage space through the insertion opening is in contact with each of the two spheres that make up the sphere pair.

2. The rotation mechanism according to claim 1 , A rotation mechanism in which three or more pairs of spheres are accommodated in the accommodation space of the annular frame.

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