Rotating body holding mechanism

Abstract

To provide a rotating body holding mechanism capable of appropriately holding a rotating body while securing execution of other motions.SOLUTION: The rotating body holding mechanism includes a holding member. The holding member includes an outer member, an inner member, and a bearing. The outer member includes a bottom wall, a top wall, and a side wall. The holding member further includes a first elastic member in which the shaft portion is accommodated on the inner side and which is disposed between the bottom wall portion and the inner member in the axial direction, and a second elastic member in which the shaft portion is accommodated on the inner side and which is disposed between the top wall portion and the inner member in the axial direction. The bearing is disposed between the first elastic member and the second elastic member in the axial direction.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a rotating body holding mechanism. [Background technology]

[0002] A spherical bearing including a large ball, a housing with a spherical concave wall, a small ball holder, and a plurality of small balls has been disclosed (see, for example, Patent Document 1). According to Patent Document 1, balls (small balls) are used as rolling elements in the raceway of the spherical plain bearing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4749279 Summary of the Invention [Problem to be solved by the invention]

[0004] In a mechanism for holding a rotating body, there are cases where the member holding the rotating body performs other movements while rotating the rotating body, such as up and down movements, relative rotational movements with respect to the rotating body, or even swinging movements. In such cases, it is necessary to properly hold the rotating body while ensuring that the member holding the rotating body can perform other movements.

[0005] Therefore, one of the objects is to provide a rotating body holding mechanism that can properly hold a rotating body while ensuring the performance of other exercises. [Means for solving the problem]

[0006] A rotating body holding mechanism according to the present disclosure holds a rotating body and includes a holding member disposed on the outer diameter side of a shaft portion serving as a rotating body and attached to the shaft portion. The holding member includes an outer member having a gap therein, an inner member disposed within the gap, and a bearing disposed within the gap, the bearing including an inner ring attached to the outer peripheral surface of the shaft portion, an outer ring disposed on the outer diameter side of the inner ring and attached to the inner member, and a plurality of rolling elements disposed between the inner ring and the outer ring, for rotatably supporting the shaft portion. The outer member includes a bottom wall portion having a first through hole penetrating the axial direction of the shaft portion and in which the shaft portion is accommodated within the first through hole, a top wall portion spaced axially from the bottom wall portion and having a second through hole penetrating the axial direction of the shaft portion and in which the shaft portion is accommodated within the second through hole, and a side wall portion spaced radially from the outer peripheral surface of the shaft portion and connected to the bottom wall portion and the top wall portion. The retaining member further includes a first elastic member having a shaft portion housed on its inner side and disposed axially between the bottom wall portion and the inner member, and a second elastic member having a shaft portion housed on its inner side and disposed axially between the top wall portion and the inner member. The bearing is disposed axially between the first elastic member and the second elastic member. [Effects of the Invention]

[0007] According to the above rotating body holding mechanism, the rotating body can be properly held while ensuring the performance of other exercises. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic perspective view showing a rotating body holding mechanism according to the first embodiment of the present disclosure. [Figure 2] FIG. 2 is a schematic side view of the rotating body holding mechanism shown in FIG. [Figure 3] FIG. 3 is a schematic plan view of the rotating body holding mechanism shown in FIG. [Figure 4] FIG. 4 is a schematic cross-sectional view of the rotating body holding mechanism shown in FIG. [Figure 5] FIG. 5 is a schematic perspective view showing the rotating body holding mechanism shown in FIG. 1 with the holding member removed. [Figure 6] FIG. 6 is a schematic side view of the rotating body holding mechanism shown in FIG. [Figure 7] FIG. 7 is a schematic plan view of the rotating body holding mechanism shown in FIG. [Figure 8] FIG. 8 is a schematic cross-sectional view of the rotating body holding mechanism when the outer member performs a swinging motion in the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] [Outline of the embodiment] A rotating body holding mechanism according to the present disclosure is a rotating body holding mechanism for holding a rotating body, and includes a holding member disposed on the outer diameter side of a shaft portion serving as a rotating body and attached to the shaft portion. The holding member includes an outer member having a gap therein, an inner member disposed within the gap, and a bearing disposed within the gap, the bearing including an inner ring attached to the outer peripheral surface of the shaft portion, an outer ring disposed on the outer diameter side of the inner ring and attached to the inner member, and a plurality of rolling elements disposed between the inner ring and the outer ring, and rotatably supporting the shaft portion. The outer member includes a bottom wall portion having a first through hole penetrating the axial direction of the shaft portion and in which the shaft portion is accommodated within the first through hole, a top wall portion spaced axially from the bottom wall portion and having a second through hole penetrating the axial direction of the shaft portion and in which the shaft portion is accommodated within the second through hole, and a side wall portion spaced radially from the outer peripheral surface of the shaft portion and connected to the bottom wall portion and the top wall portion. The retaining member further includes a first elastic member having a shaft portion housed on its inner side and disposed axially between the bottom wall portion and the inner member, and a second elastic member having a shaft portion housed on its inner side and disposed axially between the top wall portion and the inner member. The bearing is disposed axially between the first elastic member and the second elastic member.

[0010] According to the rotating body holding mechanism of the present disclosure, a holding member can rotatably hold a shaft portion serving as a rotating body. In this case, the holding member includes an outer member having the above-described configuration and an inner member having the above-described configuration. The holding member further includes a bearing, a first elastic member, and a second elastic member arranged as described above. In this way, the first elastic member and the second elastic member can elastically deform to rotatably hold the shaft portion while allowing other movements of the outer member included in the holding member, such as up-down movement, rotational movement, and swinging movement of the outer member. In this case, a gap is provided between the outer member and the inner member, making it easy to avoid interference between the outer member and the inner member when performing other movements. As described above, the above rotating body holding mechanism can appropriately hold a rotating body while ensuring the performance of other movements.

[0011] In the rotating body holding mechanism, the first elastic member and the second elastic member may each be a coiled wave spring. This ensures the strength of each of the first elastic member and the second elastic member while preventing the axial length from becoming too long, making it easier to perform other movements of the outer member with high precision.

[0012] In the above rotating body holding mechanism, the bearing may be a cross roller bearing. This allows a relatively compact structure to adequately support loads generated in the radial and thrust directions, thereby facilitating smooth other movements of the outer member.

[0013] In the above rotating body holding mechanism, the bottom wall may be provided with a first recess into which an axial end of the first elastic member is fitted. The top wall may be provided with a second recess into which an axial end of the second elastic member is fitted. By doing so, the first elastic member can be appropriately held by the first recess in the bottom wall of the outer member. This makes it possible to stabilize the posture of the first elastic member. Furthermore, the second recess can be appropriately held by the top wall of the outer member. This makes it possible to stabilize the posture of the second elastic member. Therefore, it is possible to suppress a decrease in the accuracy of movement of the outer member caused by unstable postures of the first elastic member and the second elastic member in the outer member.

[0014] In the above-described rotating body holding mechanism, both axial end surfaces of the inner member may be provided with a third recess into which the axial end of the first elastic member fits and a fourth recess into which the axial end of the second elastic member fits. This allows the third recess to appropriately hold the first elastic member in the inner member, stabilizing its position, and the fourth recess to appropriately hold the second elastic member, stabilizing its position. This prevents a decrease in the accuracy of movement of the outer member due to instability in the positions of the first elastic member and the second elastic member in the inner member.

[0015] In the rotating body holding mechanism, the outer member may include a first flange portion that protrudes radially outward. This allows the first flange portion to be used to transmit power when causing the outer member to perform other movements. This improves convenience.

[0016] In the rotating body holding mechanism, the first elastic member may be the same as the second elastic member. This reduces the complexity for the user during installation and assembly, thereby improving productivity and ease of handling.

[0017] [Specific example of embodiment] Next, an example of a specific embodiment of a rotating body holding mechanism including a support mechanism according to the present disclosure will be described with reference to the drawings. In the following drawings, the same or corresponding parts are designated by the same reference numerals, and description thereof will not be repeated.

[0018] (Embodiment 1) First, a first embodiment of the present disclosure will be described. FIG. 1 is a schematic perspective view of a rotating body holding mechanism according to the first embodiment of the present disclosure. FIG. 2 is a schematic side view of the rotating body holding mechanism shown in FIG. 1. FIG. 3 is a schematic plan view of the rotating body holding mechanism shown in FIG. 1. FIG. 4 is a schematic cross-sectional ... taken along the line indicated by arrows IV-IV in FIG. 3. Note that FIG. 4 is a cross-sectional view taken along a plane including the central axis of rotation of a shaft portion, which will be described later. In the figures shown in FIG. 1 and subsequent figures, the direction indicated by arrow Z is the axial direction, and the directions indicated by arrows Y and Z are radial directions. The directions indicated by arrows X and Y are orthogonal to each other. Note that in the figures shown in FIG. 1 and subsequent figures, the central axis R, which is the center of rotation of the shaft portion, is indicated by a dashed line.

[0019] 1, 2, 3, and 4, a rotating body holding mechanism 10a according to the present disclosure holds a shaft portion 11a as a rotating body. In this embodiment, the shaft portion 11a is solid cylindrical, but the shaft portion 11a may be hollow cylindrical. The shaft portion 11a extends straight in the axial direction (Z direction). The outer peripheral surface 12a of the shaft portion 11a is an arcuate surface. The shaft portion 11a rotates around a rotation center axis 13a indicated by a dashed line in FIG. 4.

[0020] The rotating body holding mechanism 10a includes a holding member 21a. The holding member 21a is disposed on the outer diameter side of the shaft portion 11a and attached to the shaft portion 11a. The holding member 21a includes an outer member 23a, an inner member 24a, a cross roller bearing 22a as a bearing, a first spring 51a as a first elastic member, and a second spring 52a as a second elastic member. A gap 25a is provided inside the outer member 23a. The inner member 24a is disposed within the gap 25a. The cross roller bearing 22a is also disposed within the gap 25a.

[0021] The outer member 23a includes a bottom wall portion 26a, a top wall portion 27a, and a side wall portion 28a. In this embodiment, the bottom wall portion 26a and the top wall portion 27a are both plate-shaped. Specifically, the bottom wall portion 26a and the top wall portion 27a are both disk-shaped. The thickness of the bottom wall portion 26a is equal to the thickness of the top wall portion 27a. A first through hole 31a is provided in the center of the bottom wall portion 26a when viewed in the Z direction, penetrating the bottom wall portion 26a in the axial direction (Z direction), i.e., in the thickness direction of the bottom wall portion 26a. The first through hole 31a is circular and shaped to fit the outer peripheral surface 12a of the shaft portion 11a. The shaft portion 11a is accommodated within the first through hole 31a. The top wall portion 27a is disposed axially spaced from the bottom wall portion 26a. A second through hole 32a is also provided in the center of the top wall 27a when viewed in the Z direction, penetrating the top wall 27a in the axial direction (Z direction), i.e., in the thickness direction of the top wall 27a. The second through hole 32a is a circular hole whose shape follows the outer peripheral surface 12a of the shaft 11a. The shaft 11a is housed in the second through hole 32a.

[0022] A first recess 33a is provided in the bottom wall 26a. The first recess 33a is provided so that the thickness of the bottom wall 26a around the first through hole 31a is thinner than the thickness of the bottom wall 26a in other regions. The first recess 33a is formed by recessing a portion of a surface 34a of the bottom wall 26a on the side where the inner member 24a is located in the axial direction. An end of the first spring 51a can be fitted into the first recess 33a. A second recess 35a is provided in the top wall 27a. The second recess 35a is provided so that the thickness of the top wall 27a around the second through hole 32a is thinner than the thickness of the top wall 27a in other regions. The second recess 35a is formed by recessing a portion of a surface 36a of the top wall 27a on the side where the inner member 24a is located in the axial direction. An end of the second spring 52a can be fitted into the second recess 35a.

[0023] The side wall portion 28a is disposed radially apart from the outer peripheral surface 12a of the shaft portion 11a. The side wall portion 28a extends continuously in the circumferential direction. That is, the side wall portion 28a is hollow cylindrical. The side wall portion 28a is connected to the bottom wall portion 26a and the top wall portion 27a. Specifically, the side wall portion 28a is connected to the outer peripheral end of the bottom wall portion 26a and the outer peripheral end of the top wall portion 27a. The outer member 23a includes a first flange portion 29a that protrudes radially outward. The first flange portion 29a is provided so as to extend radially outward from the outer peripheral surface 30a of the side wall portion 28a. The first flange portion 29a is continuous in the circumferential direction. The space covered by the bottom wall portion 26a, the top wall portion 27a, and the side wall portion 28a becomes the above-mentioned gap 25a. In this embodiment, the bottom wall portion 26a, the top wall portion 27a, the side wall portion 28a, and the first flange portion 29a are each made of separate members, and the outer member 23a is formed by combining and joining the bottom wall portion 26a, the top wall portion 27a, the side wall portion 28a, and the first flange portion 29a.

[0024] The inner member 24a is hollow cylindrical and has a third through-hole 37a that penetrates it in the axial direction. A gap is formed radially between an outer peripheral surface 38a of the inner member 24a and the outer member 23a, specifically, an inner peripheral surface 39a of the side wall portion 28a. A gap is also formed between an end face 41a on one axial side of the inner member 24a and the surface 34a of the bottom wall portion 26a. A gap is also formed between an end face 42a on the other axial side of the inner member 24a and the surface 36a of the top wall portion 27a. In this embodiment, the inner member 24a is composed of a first member 43a and a second member 44a that are arranged adjacent to each other in the axial direction. That is, the inner member 24a is formed by combining and joining the first member 43a and the second member 44a. In this embodiment, the inner member 24a is combined by overlapping the second member 44a with the first member 43a in the axial direction. The first member 43a and the second member 44a are each hollow cylindrical. The first member 43a has a fitting recess 40a into which the cross roller bearing 22a is fitted. The fitting recess 40a is recessed in the axial direction from a surface facing the second member 44a in the axial direction.

[0025] The inner member 24a, specifically, the first member 43a included in the inner member 24a, is provided with a third recess 45a. The third recess 45a is provided so that the axial length of the first member 43a around the third through hole 37a is shorter than the axial length of the first member 43a in other regions. The third recess 45a is formed by recessing a portion of the end surface 41a of the first member 43a in the axial direction. An end of the first spring 51a can be fitted into the third recess 45a. The inner member 24a, specifically, the second member 44a included in the inner member 24a, is provided with a fourth recess 46a. The fourth recess 46a is provided so that the axial length of the second member 44a around the third through hole 37a is shorter than the axial length of the second member 44a in other regions. The fourth recess 46a is formed by recessing a portion of the end surface 42a of the second member 44a in the axial direction. The end of the second spring 52a can be fitted into the fourth recess 46a.

[0026] The cross roller bearing 22a includes an inner ring 47a, an outer ring 48a, and rollers 49a as rolling elements arranged between the inner ring 47a and the outer ring 48a. In the cross roller bearing 22a, the rollers 49a are arranged so that the rolling axes of adjacent rollers 49a are perpendicular to each other. The cross roller bearing 22a is a bearing that can appropriately withstand both thrust loads and radial loads. The inner ring 47a and the outer ring 48a are each integrally formed. The inner ring 47a and the outer ring 48a are each annular. The inner ring 47a and the outer ring 48a share a common central axis, which is the rotational axis 13a of the shaft portion 11a.

[0027] The inner ring 47a is attached to the outer peripheral surface 12a of the shaft portion 11a. The outer ring 48a is disposed on the outer diameter side of the inner ring 47a. The outer ring 48a is attached to the inner member 24a, specifically, to the first member 43a of the inner member 24a. Specifically, the cross roller bearing 22a is fitted into a fitting recess 40a provided in the first member 43a and attached.

[0028] Next, the configurations of the first spring 51a and the second spring 52a will be described. Fig. 5 is a schematic perspective view showing the rotating body holding mechanism 10a shown in Fig. 1 with the holding member 21a removed. Fig. 6 is a schematic side view of the rotating body holding mechanism 10a shown in Fig. 5. Fig. 7 is a schematic plan view of the rotating body holding mechanism 10a shown in Fig. 5.

[0029] 5, 6, and 7, the first spring 51a and the second spring 52a are each elastically deformable members. The first spring 51a and the second spring 52a each allow elastic deformation mainly in the axial direction. The first spring 51a and the second spring 52a also allow tilting of the shaft portion 11a and the outer member 23a due to the elastic deformation of the first spring 51a and the second spring 52a.

[0030] In this embodiment, the first spring 51a and the second spring 52a are each coiled wave springs. That is, the first spring 51a and the second spring 52a each have a shape obtained by coiling a flat wire material while forming a continuous wave shape. Such first springs 51a and second springs 52a can increase the spring constant, which corresponds to the elastic coefficient of the elastic member, with a small wire diameter. They also achieve stable deflection. In this embodiment, the first spring 51a is the same as the second spring 52a. That is, the first spring 51a has the same external shape, such as the inner diameter, outer diameter, and thickness (height), as well as the same performance as the second spring 52a, such as the spring constant. Fixing holes 55a used to fix the first spring 51a are provided at one end 53a and the other end 54a in the axial direction of the first spring 51a. Similarly, fixing holes are provided at one end 57a and the other end 58a of the second spring 52a in the axial direction.

[0031] The shaft 11a is accommodated on the inner side of each of the first spring 51a and the second spring 52a. The first spring 51a and the second spring 52a are arranged side by side in the axial direction. The first spring 51a is arranged on the bottom wall 26a side in the axial direction. The second spring 52a is arranged on the top wall 27a side in the axial direction.

[0032] The first spring 51a has an end 53a on one axial side fitted into the first recess 33a of the bottom wall portion 26a, and an end 54a on the other axial side fitted into the third recess 45a of the inner member 24a. The end 53a of the first spring 51a is fixed to the first recess 33a of the bottom wall portion 26a, and the end 54a of the first spring 51a is fixed to the third recess 45a of the inner member 24a. The ends 53a, 54a are fixed using the fixing hole 55a and a fixing pin (not shown) that is inserted into the fixing hole 55a and restricts movement of the ends 53a, 54a.

[0033] One axial end 57a of the second spring 52a is fitted into the second recess 35a of the top wall portion 27a, and the other axial end 58a is fitted into the fourth recess 46a of the inner member 24a. The end 57a of the second spring 52a is fixed to the second recess 35a of the top wall portion 27a, and the end 58a of the second spring 52a is fixed to the fourth recess 46a of the inner member 24a. The ends 57a, 58a are fixed using the above-mentioned fixing holes and fixing pins (not shown) that are inserted into the fixing holes to restrict movement of the ends 57a, 58a.

[0034] Here, the cross roller bearing 22a is disposed between the first spring 51a and the second spring 52a in the axial direction. That is, the shaft portion 11a is rotatably supported by the cross roller bearing 22a disposed between the first spring 51a and the second spring 52a in the axial direction.

[0035] Next, an example of a method for assembling the rotating body holding mechanism 10a configured as described above will be described. First, the inner ring 47a is fixed to the outer peripheral surface 12a of the shaft portion 11a, and the cross roller bearing 22a is attached to the shaft portion 11a. Then, the cross roller bearing 22a, specifically, mainly the outer ring 48a, is fitted into the fitting recess 40a of the first member 43a to attach the first member 43a to the outer ring 48a. A fixing pin (not shown) is attached to the third recess 45a. A fixing pin is also attached to the fourth recess 46a of the second member 44a. After that, the second member 44a is attached to the first member 43a, and the first member 43a and the second member 44a are fastened together with screws (not shown). Next, the first spring 51a is attached to the first member 43a by aligning the fixing hole 55a provided in the end 54a of the first spring 51a with the fixing pin attached to the third recess 45a provided in the first member 43a. The second spring 52a is attached to the second member 44a by aligning the fixing hole 55a provided in the end 58a of the second spring 52a with the fixing pin attached to the fourth recess 46a provided in the second member 44a. The order of attaching the first spring 51a to the first member 43a and the second spring 52a to the second member 44a does not matter. Next, the second spring 52a is attached to the top wall 27a by aligning the fixing hole 55a in the end 57a of the second spring 52a with the fixing pin attached to the second recess 35a in the top wall 27a, of which the top wall 27a and side wall 28a are fastened together with screws. Next, the first spring 51a is attached to the bottom wall 26a by aligning the fixing hole 55a in the end 53a of the first spring 51a with the fixing pin attached to the first recess 33a in the bottom wall 26a. The order of attaching the second spring 52a to the top wall 27a and the first spring 51a to the bottom wall 26a does not matter. Next, the bottom wall 26a and the side wall 28a are fastened together with screws. Finally, the side wall portion 28a and the first flange portion 29a are fastened together with screws to obtain the rotor holding mechanism 10a configured as described above.

[0036] Here, another movement, that is, a case where the outer member 23a performs a swinging movement, will be described. FIG. 8 is a schematic cross-sectional view of the rotating body holding mechanism 10a in the first embodiment when the outer member 23a performs a swinging movement. In FIG. 8, the central axis 14a of the outer member 23a is indicated by a two-dot chain line. With reference to FIG. 8 as well (particularly with reference to FIG. 4), the shaft portion 11a is rotated as indicated by the arrow R1 in FIG. 4. Then, the outer member 23a is swingably moved, for example, as indicated by the arrows D1 and D2 in FIG. 4. As a result, the outer member 23a tilts by an angle θ. This tilting due to the swinging movement can also be tolerated by the elastic deformation of the first spring 51a and the second spring 52a. That is, the outer member 23a can be tilted while the shaft portion 11a is kept extending straight in the Z direction.

[0037] The rotating body holding mechanism 10a configured as described above allows the holding member 21a to rotatably hold the shaft portion 11a as a rotating body. In this case, the holding member 21a includes the outer member 23a and the inner member 24a. The holding member 21a further includes the cross roller bearing 22a and the first and second springs 51a and 52a arranged as described above. This allows the holding member 21a to rotatably hold the shaft portion 11a while allowing other motions of the outer member 23a included in the holding member 21a, such as up-and-down, rotational, and swinging motions, due to the elastic deformation of the first and second springs 51a and 52a. In this case, the gap 25a provided between the outer member 23a and the inner member 24a makes it easy to avoid interference between the outer member 23a and the inner member 24a when the outer member 23a performs other motions. As described above, the rotating body holding mechanism 10a can appropriately hold the shaft portion 11a as a rotating body while ensuring the performance of other movements. The other movements of the outer member 23a include, for example, swinging movements that do not involve rotation, such as moving axially downward at a predetermined circumferential location and then moving axially downward at a circumferentially shifted location at the next timing. Furthermore, if the outer member 23a is fixed so that the surfaces 34a and 36a are aligned horizontally without moving, the shaft portion 11a will rotate while tilting relative to the fixed outer member 23a. The transmission of power for the other movements includes both contact with a power source (contact type) and non-contact with a power source (non-contact type).

[0038] In this embodiment, the first spring 51a and the second spring 52a are each a coiled wave spring, which ensures the strength of each of the first spring 51a and the second spring 52a while preventing the axial length from becoming too long, making it easier to perform other movements of the outer member 23a with high precision.

[0039] In this embodiment, the bearing is a cross roller bearing 22a. Therefore, with a relatively compact configuration, it is possible to appropriately bear loads generated in the radial direction and thrust direction, which makes it easier to smoothly perform other movements of the outer member 23a.

[0040] In this embodiment, the bottom wall portion 26a is provided with a first recess 33a into which the axial end portion 53a of the first spring 51a is fitted. The top wall portion 27a is provided with a second recess 35a into which the axial end portion 57a ​​of the second spring 52a is fitted. Therefore, the first spring 51a can be appropriately held by the first recess 33a in the bottom wall portion 26a of the outer member 23a. This stabilizes the posture of the first spring 51a. Furthermore, the second recess 35a in the top wall portion 27a of the outer member 23a can be appropriately held by the second recess 35a. This stabilizes the posture of the second spring 52a. Therefore, it is possible to suppress a decrease in the accuracy of the movement of the outer member 23a caused by unstable postures of the first spring 51a and the second spring 52a in the outer member 23a.

[0041] In this embodiment, both axial end surfaces 41a, 42a of the inner member 24a are provided with a third recess 45a into which the axial end portion 54a of the first spring 51a is fitted and a fourth recess 46a into which the axial end portion 58a of the second spring 52a is fitted. Therefore, in the inner member 24a, the third recess 45a can appropriately hold the first spring 51a to stabilize its position, and the fourth recess 46a can appropriately hold the second spring 52a to stabilize its position. Therefore, it is possible to suppress a decrease in the accuracy of the movement of the outer member 23a due to instability in the positions of the first spring 51a and the second spring 52a in the inner member 24a.

[0042] In this embodiment, the outer member 23a includes a first flange 29a that protrudes radially outward. Therefore, the first flange 29a can be used to transmit power when causing the outer member 23a to perform other movements. This improves convenience.

[0043] In this embodiment, the first spring 51a is the same as the second spring 52a. This reduces the complexity for the user during installation and assembly, thereby improving productivity and ease of handling.

[0044] (Other embodiments) In the above embodiment, a first spring is used as the first elastic member and a second spring is used as the second elastic member. However, the present invention is not limited to this. The first elastic member and the second elastic member may each be made of elastic rubber or resin material. In this case, the elastic coefficient, shape, and mass may be changed depending on the required performance and cost. Furthermore, a spring may be used in combination with a rubber or resin material. For example, a rubber material and a spring may be arranged side by side in the axial direction as the first elastic member. Of course, a coil spring may be used as the first elastic member and the second elastic member.

[0045] In the above embodiment, the first and second springs are fixed using fixing holes and fixing pins provided in the first and second springs. However, this is not limiting, and the first and second springs may be fixed using other methods, such as adhesive bonding, fastening with bolts, or tight fit. Regarding fixing locations, for example, when fixing the first spring, the spring may be fixed at two or more positions in the first recess. Furthermore, without providing the first, second, third, and fourth recesses, the spring may be fixed by adhesive bonding or the like to the surface that comes into contact with the end of the first spring.

[0046] In the above embodiment, the first spring and the second spring are the same, but this is not limited to this, and springs with different elastic coefficients may be used depending on the characteristics required for the first spring located on the bottom wall side and the second spring located on the top wall side.

[0047] In the above embodiment, rollers are used as the rolling elements in the bearing, but this is not a limitation and balls may be used as the rolling elements. Also, while cross roller bearings are used as the bearings, this is not a limitation and a radial bearing that receives a load in the radial direction and a thrust bearing that receives a load in the thrust direction may be combined.

[0048] The present invention is intended to cover a wide range of applications, including those related to the present invention, including those related to the present invention. [Explanation of symbols]

[0049] 10a Rotating body holding mechanism, 11a Shaft portion, 12a Outer peripheral surface, 13a Rotation central axis, 14a Central axis, 21a Holding member, 22a Cross roller bearing, 23a Outer member, 24a Inner member, 25a Gap, 26a Bottom wall portion, 27a Top wall portion, 28a Side wall portion, 29a First flange portion, 30a, 38a Outer peripheral surface, 31a First through hole, 32a Second through hole, 33a First recess, 34a, 36a Surface, 35a Second recess, 37a Third through hole, 39a Inner peripheral surface, 40a Fitting recess, 41a, 42a End face, 43a First member, 44a Second member, 45a Third recess, 46a Fourth recess, 47a Inner ring, 48a Outer ring, 49a Roller, 51a first spring, 52a second spring, 53a, 54a, 57a, 58a end, 55a fixing hole.

Claims

1. A rotating body holding mechanism for holding a rotating body, a holding member disposed on an outer diameter side of a shaft portion serving as a rotating body and attached to the shaft portion; The holding member is an outer member having a void therein; an inner member disposed within the cavity; a bearing that is disposed in the gap and rotatably supports the shaft portion, the bearing including an inner ring attached to an outer peripheral surface of the shaft portion, an outer ring disposed on the outer diameter side of the inner ring and attached to the inner member, and a plurality of rolling elements disposed between the inner ring and the outer ring, The outer member is a bottom wall portion having a first through hole that penetrates the shaft portion in an axial direction, the bottom wall portion receiving the shaft portion within the first through hole; a top wall portion that is spaced apart from the bottom wall portion in the axial direction and has a second through hole that penetrates the shaft portion in the axial direction, the top wall portion having the shaft portion accommodated in the second through hole; a side wall portion disposed at a radial distance from an outer peripheral surface of the shaft portion and connected to the bottom wall portion and the top wall portion, The holding member is a first elastic member having the shaft portion housed inside thereof and disposed between the bottom wall portion and the inner member in the axial direction; a second elastic member having the shaft portion housed on its inner side and disposed between the top wall portion and the inner member in the axial direction, The bearing is disposed between the first elastic member and the second elastic member in the axial direction.

2. The rotating body holding mechanism according to claim 1 , wherein the first elastic member and the second elastic member are each a coiled wave spring.

3. 3. The rotating body holding mechanism according to claim 1, wherein the bearing is a cross roller bearing.

4. The bottom wall portion is provided with a first recess into which an axial end portion of the first elastic member is fitted, 3. The rotating body holding mechanism according to claim 1, wherein the top wall portion is provided with a second recess into which an axial end of the second elastic member is fitted.

5. 3. The rotating body holding mechanism according to claim 1, wherein both axial end surfaces of the inner member are provided with a third recess into which the axial end of the first elastic member is fitted and a fourth recess into which the axial end of the second elastic member is fitted.

6. The rotating body holding mechanism according to claim 1 or 2, wherein the outer member includes a first flange portion that projects radially outward.

7. 3. The rotating body holding mechanism according to claim 1, wherein the first elastic member is the same as the second elastic member.

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