Motor

Abstract

The invention provides a motor which is provided with a spring component, and the spring component is high in design freedom degree and easy to manufacture when the elastic force applied to a rotating shaft is set to be a specified magnitude. A motor is provided with: a motor cover that houses a rotor and a stator; a bearing that supports one end of the rotating shaft; a plate which is fixed to the motor cover and holds the bearing; and a spring member that is fixed to the plate and that applies an elastic force to one end of the rotating shaft in a direction toward the other end of the rotating shaft, the spring member being provided with: an elastic force generating part that generates an elastic force; and an elastic force applying part which applies the elastic force to the rotating shaft, wherein the elastic force applying part is provided with a first part which is connected with the elastic force generating part; and a second portion connected to the first portion and transmitting the elastic force to the rotating shaft, the second portion being bent so as to have a boundary portion and connected to the first portion.

Description

Technical Field

[0001] The present invention relates to a motor, and more particularly to a motor including a spring member for applying elastic force to a rotating shaft in an axial direction. Background Art

[0002] As a prior art document of this type of motor, Patent Document 1 can be cited. Patent Document 1 discloses a motor 1 that includes a spring member 15 that applies elastic force to a rotating shaft 2 in the axial direction (X1 direction). The spring member 15 includes: a mounted portion 15b mounted on a bearing 14; a shaft contact portion 15a that presses the rotating shaft 2; and a connecting portion 15c that connects the shaft contact portion 15a and the mounted portion 15b. Specifically, the spring member 15 is a structure formed by bending a metal plate as a whole into a substantially S-shaped shape. Prior art literature Patent Literature

[0003] Patent Document 1: Japanese Patent Application Publication No. 2022-52379 Summary of the invention

[0004] The spring member 15 of Patent Document 1 is bent into an S-shape as a whole, and the shaft contact portion 15a of the curved surface shape located at the front end side contacts the rotating shaft 2 to apply an elastic force. Since the magnitude of the elastic force of the spring member 15 of this structure is easily changed depending on the contact position of the shaft contact portion 15a with respect to the rotating shaft 2, it is not easy to apply a predetermined elastic force to the rotating shaft 2. In addition, when designing a spring to apply a predetermined elastic force, since it is only bent, the degree of freedom in design is low.

[0005] An object of the present invention is to provide a motor including a spring member that has a high degree of freedom in design when setting the elastic force applied to a rotating shaft to a predetermined value and is easy to manufacture.

[0006] In order to achieve the above-mentioned purpose, one mode of the motor of the present invention comprises: a rotor, which has a rotating shaft and a driving magnet; a stator, which is located on the outer peripheral side of the driving magnet; a motor cover, which accommodates the rotor and the stator; a bearing, which supports one end of the rotating shaft; a plate, which is fixed to the motor cover and holds the bearing; and a spring component, which is fixed to the plate and applies an elastic force to one end of the rotating shaft in a direction toward the other end of the rotating shaft, the spring component comprises: an elastic force generating part that generates the elastic force; and an elastic force applying part that applies the elastic force to the rotating shaft, the elastic force applying part comprising: a first part connected to the elastic force generating part; and a second part connected to the first part and transmitting the elastic force to the rotating shaft, the second part being connected to the first part by being bent in a manner having a boundary portion, and the bending direction is a direction away from the bearing.

[0007] According to this embodiment, the elastic force applying portion of the spring member includes the first portion and the second portion. The second portion is bent to have a boundary portion and connected to the first portion, and the bending direction is a direction away from the bearing. Thus, the elastic force of the spring member is applied to one end of the rotating shaft not via the first portion but via the second portion closer to the front end side than the boundary portion. In this embodiment, as described above, the first part and the second part constituting the elastic force applying part are connected via the boundary part, and thus, the first part and the second part have mutually different elastic coefficients k1 and k2. The elastic force applied to the rotating shaft is set by the composite elastic coefficient (k1+k2) obtained by synthesizing the elastic coefficient k1 of the first part and the elastic coefficient k2 of the second part. The elastic coefficient k1 of the first part is determined by the elastic force generating part. On the other hand, the elastic coefficient k2 of the second part is determined by the degree of bending of the second part relative to the first part. In other words, it is determined by the bending angle of the second part relative to the first part. That is, the elastic coefficient k2 can be changed by changing the bending angle. As described above, according to this embodiment, by changing the elastic coefficient k2 of the second portion, the elastic force applied to the rotating shaft can be easily set to a desired value. Therefore, a motor can be provided, which includes a spring component that has a high degree of freedom in design when setting the elastic force applied to the rotating shaft to a predetermined value and is easy to manufacture.

[0008] In the motor of the above aspect, the present invention is characterized in that a portion of the rotating shaft side that contacts the second portion has a convex curved surface shape.

[0009] According to this aspect, since the portion on the rotating shaft side that contacts the second portion has a convex curved surface shape, it is easy to make the second portion contact the corresponding portion on the rotating shaft side.

[0010] In addition, in the motor of the above-mentioned embodiment of the present invention, the spring component is formed by bending a flat metal plate into a U shape, and has: a flat fixing portion, which is fixed to the plate; the elastic force generating portion, which is connected to the fixing portion and is composed of a portion bent into the U shape; and the elastic force applying portion, which is connected to the elastic force generating portion, and the elastic force generating portion and the second portion are deformed by the second portion contacting the rotating shaft side, and the elastic force is generated as a reaction force generated by these deformations.

[0011] According to this embodiment, the spring component includes: the elastic force generating portion formed by bending a metal plate into a U-shape; and the elastic force applying portion, and the elastic force generating portion and the second portion are deformed by the second portion contacting the rotating shaft side, and the elastic force is generated as a reaction force generated by these deformations. Thus, it is easy to manufacture a spring component that applies a predetermined amount of elastic force to the rotating shaft.

[0012] In the motor of the above aspect, the present invention is characterized in that the plate is formed of a metal plate, and the fixing portion is fixed to the plate by welding.

[0013] According to this embodiment, the plate is formed of a metal plate, and the fixing portion of the spring member is fixed to the plate by welding. That is, since the spring member is fixed to the plate by welding, the fixing strength can be increased, and for example, the elastic force can be increased compared to a structure in which the spring member is fixed by hooks instead of welding.

[0014] In the motor of the above aspect, the plate includes a flat plate portion fixed to the motor cover and a recessed portion recessed from the flat plate portion in a direction in which the elastic force is applied, and the bearing is accommodated in the recessed portion.

[0015] According to this aspect, the plate includes the flat plate portion and the recessed portion, and the bearing is accommodated in the recessed portion. This makes it possible to reduce the overall length of the rotating shaft of the motor in the axial direction.

[0016] In the motor of the above aspect, the present invention is characterized in that the portion of the rotating shaft side in contact with the second portion protrudes toward the second portion from the flat plate portion.

[0017] In this aspect, as described above, the elastic force generating portion and the second portion are deformed by the second portion contacting the rotating shaft side, and the elastic force is generated as a reaction force to the deformation. The larger the deformation, the larger the elastic force. According to this aspect, the portion of the rotating shaft side that contacts the second portion protrudes toward the second portion from the flat plate portion. This makes it easy to increase the elastic force.

[0018] According to the present invention, it is possible to provide a motor including a spring member that has a high degree of freedom in design when setting the elastic force applied to the rotating shaft to a predetermined magnitude and is easy to manufacture. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a perspective view of the main parts of the motor according to the first embodiment of the present invention. Figure 2 It is a side cross-sectional view of the motor according to the first embodiment. Figure 3It is a schematic diagram showing an enlarged view of the main part of the first embodiment. Figure 4 It is a schematic diagram showing an enlarged view of the main part of Embodiment 2 of the present invention. Figure 5 It is a schematic diagram which shows the comparative example in an enlarged manner. DETAILED DESCRIPTION

[0020] The following is based on Figures 1 to 5 Embodiments of the motor of the present invention will be described in detail. In the following description, as shown in the figures, three mutually orthogonal axes are set as X-axis, Y-axis, and Z-axis, respectively. The directions indicated by the arrows of the three axes (X, Y, Z) are the + directions of each direction, and the opposite directions are the - directions. The Z-axis direction is equivalent to the vertical direction, that is, the direction of gravity, the +Z direction shows the vertical top, and the -Z direction shows the vertical bottom. The X-axis direction and the Y-axis direction are equivalent to the horizontal direction. The +Y direction shows the front of the motor, and the -Y direction shows the back of the motor. The +X direction shows the right side of the motor, and the -X direction shows the left side of the motor.

[0021] [Implementation Method 1] The motor 1 of this embodiment is a stepping motor and is a motor serving as a driving source for sliding a head-up display device (not shown) in the axial direction of a rotating shaft described later. Of course, the motor 1 of the present invention is not limited to a motor for sliding the head-up display device. like Figure 1 and Figure 2 As shown, the motor 1 of this embodiment includes: a rotor 7 having a rotating shaft 3 and a driving magnet 5; a stator 9 located on the outer peripheral side of the driving magnet 5; and a motor cover 11 that accommodates the rotor 7 and the stator 9. In addition, the motor 1 includes: a bearing 15 that supports one end 13 of the rotating shaft 3; and a plate 17 that is fixed to the motor cover 11 and holds the bearing 15. In addition, the motor 1 includes a spring member 21. The spring member 21 is fixed to the plate 17, and applies an elastic force F to the one end 13 of the rotating shaft 3 in a direction toward the other end 19 of the rotating shaft 3. The rotating shaft 3 is made of metal. The driving magnet 5 is a permanent magnet formed in a cylindrical shape and rotates integrally with the rotating shaft 3 via the boss 10. Figure 2 In FIG. 1 , reference numeral 12 indicates a coil, and reference numeral 14 indicates a frame for holding the motor 1. Figure 1 and Figure 2 In the figure, reference numeral 16 denotes a terminal cover. In the present embodiment, as will be described later, the spring member 21 is configured to indirectly apply the elastic force F to the rotating shaft 3 via the bearing 15 .

[0022] The spring member 21 includes: an elastic force generating portion 23 for generating an elastic force F; and an elastic force applying portion 25 for applying the elastic force F to the rotating shaft 3. The elastic force applying portion 25 includes: a first portion 27 connected to the elastic force generating portion 23; and a second portion 29 connected to the first portion 27 and transmitting the elastic force F to the rotating shaft 3. The second portion 29 includes a boundary portion 31 and is bent and connected to the first portion 27. The bending direction of the second portion 29 relative to the first portion 27 is a direction away from the bearing 15. Here, both the first portion 27 and the second portion 29 are in the shape of a flat plate.

[0023] In this embodiment, if Figure 2 As shown in the figure, the bearing 15 includes: a cylinder 2 that holds the outer peripheral surface of the rotating shaft 3; and a convex curved surface 4 that is formed integrally with the cylinder 2 and covers the end surface 6 of the end 13 of the rotating shaft 3. The end 13 of the rotating shaft 3 is rotatably held in the bearing 15 by the ball 8. The second portion 29 of the spring member 21 contacts the convex curved surface 4 of the bearing 15, and the elastic force F is applied to the rotating shaft 3 via the bearing 15. That is, in the present embodiment, the spring member 21 is configured to indirectly apply the elastic force F to the rotating shaft 3 via the bearing 15. In addition, it is of course not limited to the structure that indirectly applies the elastic force F to the rotating shaft 3 via the bearing 15. The spring member 21 may also be configured to contact the end surface of the end portion 13 of the rotating shaft and directly apply the elastic force F. In this case, the bearing 15 does not have the convex curved portion 4, but instead has a through hole. Moreover, the end portion 13 of the rotating shaft 3 penetrates the through hole and protrudes toward the spring member 21 side, and the end surface 6 of the rotating shaft 3 is formed into a convex curved surface shape.

[0024] In this embodiment, if Figure 2 As shown, the spring member 21 is formed by bending a flat metal plate into a U-shape. The elastic force applying portion 25 is formed by bending the second portion 29 relative to the first portion 27 without bending, thereby forming a boundary portion 31. The bending angle θ is set from the viewpoint of obtaining the required elastic force F, but is generally within the range of an obtuse angle. That is, the spring member 21 includes a flat plate-shaped fixing portion 33 fixed to the plate 17 , an elastic force generating portion 23 connected to the fixing portion 33 and formed of a portion bent into a U-shape, and an elastic force applying portion 25 connected to the elastic force generating portion 23 . In the present embodiment, the elastic force F is configured such that the U-shaped elastic force generating portion 23 and the second portion 29 are deformed by the second portion 29 contacting the convex curved surface portion 4 of the bearing 15 on the rotating shaft 3 side, and the reaction force is generated by these deformations.

[0025] In the present embodiment, the plate 17 is formed of a metal plate, and the fixing portion 33 is fixed to the plate 17 by welding. In addition, if Figure 2As shown, in this embodiment, the plate 17 has: a flat portion 35 fixed to the motor cover 11; and a recessed portion 37 recessed from the flat portion 35 in the direction (-Y direction) to which the elastic force F is applied. And the bearing 15 is accommodated in the recessed portion 37. Specifically, the base 18 of the bearing 15 is accommodated in a state of being in contact with the inner surface 20 of the recessed portion 37 so as to be slidable in the direction (-Y direction) of the elastic force F. As a result, the rotating shaft 3 is held in a state of being pressed by the bearing (not shown) of the other end portion 19 by the elastic force F of the spring member 21. The recessed portion 37 is formed by producing the plate 17 by drawing a metal plate.

[0026] In addition, if Figure 1 and Figure 2 As shown, in this embodiment, the portion of the rotating shaft 3 side that contacts the second portion 29, that is, the convex curved surface portion 4 of the bearing 15 protrudes toward the second portion 29 side (+Y side) more than the flat portion 35. Figure 1 and Figure 2 In FIG. 2 , reference numeral 22 denotes a through hole formed in the fixing portion 33 of the spring member 21. The convex curved surface portion 4 of the bearing 15 passes through the through hole 22 and protrudes toward the second portion 29 side (+Y side). exist Figure 1 In the figure, reference numerals 24 and 26 indicate positioning holes. The spring member 21 is positioned and mounted on the plate 17 by using the positioning holes 24 and 26. The positions of the positioning holes 24 and 26 are also positions for positioning the plate 17 and the motor cover 11.

[0027] <Significance of applying elastic force to the rotation axis side by the second portion> according to Figure 3 The schematic diagram is described as follows. As described above, the first portion 27 and the second portion 29 constituting the elastic force applying portion 25 are connected via the boundary portion 31, and thus the first portion 27 and the second portion 29 have different elastic coefficients k1 and k2. The elastic force F applied to the rotating shaft 3 can be set by the composite elastic coefficient (k1+k2) obtained by combining the elastic coefficient k1 of the first portion 27 and the elastic coefficient k2 of the second portion 29. The elastic coefficient k1 of the first portion 27 is determined by the elastic force generating portion 23. On the other hand, the elastic coefficient k2 of the second portion 29 is determined by the degree of bending of the second portion 29 relative to the first portion 27. In other words, the elastic coefficient k2 is determined by the bending angle θ of the second portion 29 relative to the first portion 27. That is, the elastic coefficient k2 can be changed by changing the bending angle θ. This makes it easy to set the combined elastic coefficient (k1+k2) for obtaining the elastic force F of a predetermined magnitude. Therefore, by changing the elastic coefficient k2 of the second portion 29, the elastic force F applied to the rotating shaft 3 can be easily set to a desired magnitude.

[0028] <Description of Effects of First Embodiment> (1) In the present embodiment, the elastic force applying portion 25 of the spring member 21 includes the first portion 27 and the second portion 29. The second portion 29 includes the boundary portion 31 and is connected to the first portion 27 in a bent manner, and the bending direction is a direction away from the bearing 15. Thus, the elastic force F of the spring member 21 is applied to the one end portion 13 of the rotating shaft 3 not via the first portion 27 but via the second portion 29 located on the front end side of the boundary portion 31. Therefore, the elastic force F applied to the rotating shaft 3 can be easily set to a desired value by changing the elastic coefficient k2 of the second portion 29. Therefore, a motor 1 can be provided, which includes a spring member 21 that has a high degree of freedom in design when setting the elastic force F applied to the rotating shaft 3 to a predetermined value and is easy to manufacture.

[0029] (2) In the present embodiment, since the portion of the second portion 29 that contacts the rotating shaft 3 side has a convex curved surface shape, it is easy to make the second portion 29 contact the corresponding portion on the rotating shaft 3 side. For example, Figure 5 As shown in FIG. 1 , when the portion of the bearing 15 that contacts the elastic force applying portion 25 is a flat portion 28, the boundary portion 31 of the elastic force applying portion 25 contacts the flat portion 28, and it is difficult to contact the second portion 29 with the flat portion 28. In other words, when the shape is not flat but a convex curved surface, it is easy to contact the second portion 29 with the corresponding portion on the rotating shaft 3 side. (3) In addition, in the present embodiment, the spring member 21 includes the elastic force generating portion 23 and the elastic force applying portion 25 formed by bending a metal plate into a U-shape, and the elastic force F is generated as a reaction force to the deformation by the second portion 29 contacting the rotating shaft 3 side, thereby deforming the elastic force generating portion 23 and the second portion 29. Therefore, it is easy to manufacture the spring member 21 having a predetermined elastic force F applied to the rotating shaft 3.

[0030] (4) In the present embodiment, the plate 17 is formed of a metal plate, and the fixing portion 33 of the spring member 21 is fixed to the plate 17 by welding. That is, since the spring member 21 is fixed to the plate 17 by welding, the fixing strength can be increased, and for example, the elastic force F can be increased compared to a structure in which the spring member 21 is fixed by hooks instead of welding. (5) In the present embodiment, the plate 17 has the flat portion 35 and the recessed portion 37, and the bearing 15 is accommodated in the recessed portion 37. This can reduce the overall length of the rotating shaft 3 of the motor 1 in the axial direction (Y-axis direction).

[0031] (6) As described above, the elastic force F deforms the elastic force generating portion 23 and the second portion 29 due to the second portion 29 coming into contact with the rotating shaft 3 , and is generated as a reaction force due to these deformations. The greater the deformation, the greater the elastic force. In the present embodiment, the portion of the rotating shaft 3 side that contacts the second portion 29, that is, the convex curved surface portion 4 of the bearing 15, protrudes toward the second portion 29 more than the flat portion 35. Therefore, the elastic force F can be easily increased.

[0032] [Implementation Method 2] Next, based on Figure 4 Embodiment 2 of the motor 1 of the present invention will be described. The same reference numerals are given to the same components as those in Embodiment 1, and description thereof will be omitted. In the present embodiment, the portion of the bearing 15 that contacts the elastic force applying portion 25 is the flat portion 28. Therefore, the second portion 29 can be brought into contact with the flat portion 28 by increasing the bending radius of the portion of the elastic force generating portion 23 that is bent into a U-shape or by shifting the position of the flat portion 28 toward the -Y direction. In this embodiment as well, substantially the same effects as those of the first embodiment can be obtained.

[0033] [Other embodiments] The motor 1 of the present invention basically has the above-mentioned structure, but it is of course possible to modify or omit some of the structures without departing from the gist of the present invention. In the above embodiment, the convex curved surface 4 of the bearing 15 protrudes toward the +Y side from the flat portion 35 of the plate 17. However, the present invention is not limited to this structure, and any structure may be used as long as the second portion 29 contacts the flat portion 35 without protruding. In the above embodiment, the spring member 21 is welded and fixed to the plate 17 , but the fixing is not limited to welding, and may be fixed by screws. Explanation of symbols

[0034] 1…motor, 2…cylinder, 3…rotating shaft, 4…convex curved surface, 5…driving magnet, 6…end face, 7…rotor, 8…sphere, 9…stator, 10…boss, 11...motor cover, 12...coil, 13...one end, 14...frame, 15...bearing, 16...terminal cover, 17...plate, 19...other end, 20 ... inner surface, 21 ... spring member, 22 ... through hole, 23 ... elastic force generating portion, 24 ... positioning hole, 25 ... elastic force applying portion, 26 ... positioning hole, 27 ... first portion, 29…second portion, 31…boundary portion, 33…fixed portion, 35…flat portion, 37…concave portion, k1…elastic coefficient of the first portion, k2…elastic coefficient of the second portion, θ…bending angle.

Claims

1. A motor, characterized in that: have: a rotor having a rotating shaft and a driving magnet; a stator located on the outer peripheral side of the driving magnet; A motor cover, the motor cover accommodating the rotor and the stator; a bearing supporting one end of the rotating shaft; a plate fixed to the motor cover and holding the bearing; and a spring member fixed to the plate and applying an elastic force to one end of the rotating shaft in a direction toward the other end of the rotating shaft, The spring component comprises: an elastic force generating portion, the elastic force generating portion generating the elastic force; as well as an elastic force applying portion, the elastic force applying portion applying the elastic force to the rotating shaft, The elastic force applying portion comprises: A first part connected to the elastic force generating part; and a second part, which is connected to the first part and transmits the elastic force to the rotating shaft, The second portion is bent to have a boundary portion and connected to the first portion. The bending direction is a direction away from the bearing.

2. The motor according to claim 1, characterized in that The portion of the rotating shaft side that contacts the second portion has a convex curved surface shape.

3. The motor according to claim 1, characterized in that The spring member is formed by bending a flat metal plate into a U-shape and has: a flat plate-shaped fixing portion fixed to the plate; the elastic force generating portion connected to the fixing portion and formed by a portion bent into the U-shape; and The elastic force applying part connected to the elastic force generating part, The elastic force generating portion and the second portion are deformed by the second portion contacting the rotating shaft side, and the elastic force is generated as a reaction force to the deformation.

4. The motor according to claim 3, characterized in that The plate is formed of sheet metal, The fixing portion is fixed to the plate by welding.

5. The motor according to claim 3, characterized in that The board has: A flat plate portion fixed to the motor cover; and A concave portion that is recessed from the flat plate portion toward the direction of the elastic force, The bearing is accommodated in the recessed portion.

6. The motor according to claim 5, characterized in that A portion of the rotating shaft side in contact with the second portion protrudes toward the second portion from the flat plate portion.

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