JP2018014826A - Motor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor device including a feed screw and a nut member, in which other movable component to be moved linearly can be assembled efficiently to the nut member.SOLUTION: A motor device includes a motor 200 as a drive source, a feed screw 300 rotating by the driving force of the motor, a nut member 350 attached to the feed screw, and a frame 400 for supporting the feed screw. The frame has a proximal part 410 arranged in the axial direction of the feed screw, and a convex portion 411 projecting to the feed screw side is formed in the proximal part. The nut member is arranged above the convex portion, and thereby slope of its angular position is limited.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a motor device.

  Patent Document 1 below discloses a focus mechanism that reciprocates a lens with a lead screw.

Japanese Patent Laid-Open No. 7-336938

  In a device equipped with a mechanism that converts the rotational motion of the motor into linear motion using a lead screw, when assembling other movable parts that move linearly to the screw nut, it is necessary to assemble it while keeping the screw nut at an appropriate angular position. is there. When adjusting and maintaining such an angular position by hand, for example, when the screw nut is small, or when the screw nut is disposed in a narrow space or a position that is difficult to visually recognize, the assembling work becomes complicated. There is a fear.

  In view of the above problems, the problem to be solved by the present invention is a motor device including a feed screw and a nut member, and a motor device capable of efficiently assembling other movable parts for linear movement to the nut member. Is to provide.

  In order to solve the above problems, a motor device of the present invention supports a motor as a drive source, a feed screw that rotates by the driving force of the motor, a nut member attached to the feed screw, and the feed screw. A frame body, and the frame body has a base portion arranged along the axial direction of the feed screw, and the base portion has a convex portion protruding toward the feed screw side. The nut member is disposed on the convex portion, so that the inclination of the angular position is limited. The base portion is a flat plate portion arranged with the upper surface, which is one plate surface, facing the feed screw side, and the frame supports the feed screw in parallel with the base portion, and the convex portion The portion is preferably a portion where the surface position of the upper surface of the base portion protrudes toward the feed screw.

  Usually, a gap is provided between the nut member and the base so that the nut member and other movable parts assembled thereto do not come into contact with the base. Due to this gap, the angular position of the nut member becomes unstable, and the nut member is easily inclined in either of the circumferential directions. When assembling the movable part while manually holding such a nut member at an appropriate angular position, the assembling work may be complicated. In the motor device of the present invention, a convex portion that restricts the inclination of the nut member is formed in the movable range of the nut member, and the nut member is arranged on the convex portion, so that the nut member is not involved manually. Can be kept at an appropriate angular position. Thereby, it becomes possible to efficiently assemble another movable part to the nut member.

  Moreover, it is preferable that the said convex part is formed in any one edge part or its vicinity part of the movable range in the reciprocating direction of the said nut member.

  Since the convex portion is formed at a height that can limit the inclination of the nut member, the nut member may rub against the convex portion when the nut member passes over the convex portion. Therefore, avoid the part where the nut member can pass frequently, such as near its center, in the movable range in the reciprocating direction of the nut member.For example, after assembling the movable part to the end part, its vicinity, other nut parts, etc. Such a problem can be suppressed by providing a convex portion at a portion that is not used.

  Moreover, it is preferable that the said convex part is formed outside the effective movable range which is a movable range of the other components assembled | attached to this nut member among the movable ranges in the reciprocating direction of the said nut member.

  When the nut member passes over the convex part after other parts are assembled to the nut member, the nut member is projected by vibration of the device in which the motor device is incorporated or by other parts. There is a risk of contact. Such a problem can be avoided by arranging the convex portion outside the effective movable range of the other components.

  Moreover, it is preferable that the said convex part has an inclined surface which guide | induces this nut member to the top part of the said convex part, correct | amending the angular position of this nut member when the said nut member rides.

  When the nut member is moved by the feed screw, a frictional force that tilts the nut member toward the rotation direction of the feed screw acts. Here, for example, when the side surface of the convex portion is a vertical surface, the inclined portion of the nut member is engaged with the side surface of the convex portion, so that the nut member may not be intended and cannot be moved. In this configuration, an inclined surface on which the nut member can ride is provided on the convex portion, and this inclined surface prevents such problems by guiding the nut member to the top while correcting the angular position of the nut member to the normal position. can do.

  Moreover, it is preferable that the top part of the said convex part is linearly formed in the direction orthogonal to the axial direction of the said feed screw in the upper surface of the said base.

  The top part of the convex part is not limited as long as it can limit the inclination of the nut member. By forming the top portion of the convex portion in a linear shape, it is possible to achieve both the securing of the movable range of the nut member and the efficiency of the work of assembling the movable component to the nut member.

  Moreover, when the said nut member is arrange | positioned on the said convex part, it is preferable that the opposing surface with the said convex part of this nut member is a plane.

  When the nut member is opposed to the convex portion in a plane, the nut member can be prevented from being inclined by the convex portion having a simple structure.

  According to the motor device of the present invention, it is possible to efficiently assemble another movable part that is linearly moved to the nut member.

It is a perspective view which shows the external appearance of the motor apparatus concerning this embodiment. It is a side view of a motor apparatus. It is MM sectional drawing of the motor apparatus of FIG. It is the side view and top view which show the modification of a convex part. It is the side view and top view which show the modification of a convex part.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

〔overall structure〕
FIG. 1 is a perspective view illustrating an appearance of a motor device 10 according to the present embodiment. FIG. 2 is a side view of the motor device 10. The motor device 10 is a device that converts the rotational motion of the motor 200 into a linear motion. The motor device 10 mainly includes a motor 200 that is a drive source, a lead screw 300 that is a feed screw that is rotated by the driving force of the motor 200, a screw nut 350 that is a nut member attached to the lead screw 300, and these. The frame 400 is a frame body. The motor device 10 is incorporated in, for example, an optical pickup mechanism of an optical drive or a camera focus mechanism. A movable part P (not shown), which is another part that reciprocates together with the screw nut 350, is assembled to the screw nut 350 according to each mechanism.

[Motor configuration]
3 is a cross-sectional view of the motor device 10 shown in FIG. Hereinafter, the structure of the motor 200 will be described with reference to FIG.

  The motor 200 of this embodiment is a so-called PM type stepping motor. The motor 200 includes a rotor 220 composed of the base end portion 300b of the lead screw 300 and the permanent magnet 221 and a stator 210 disposed opposite to the outer peripheral surface of the permanent magnet 221 with a predetermined air gap interposed therebetween. .

  The motor 200 includes a two-phase stator 210 arranged side by side in the axial direction. Each stator 210 is disposed so that the bobbin 212 around which the drive coil 211 is wound, the outer yoke 213 that supports the bobbin 212 so as to cover the bobbin 212 from the outside, and the bobbin 212 sandwiched between the outer yoke 213 from the inside. The inner yoke 214 is used. The outer yoke 213 has a plurality of pole teeth 213 a arranged at a predetermined pitch along the circumferential direction at a portion facing the permanent magnet 221. Similarly, the inner yoke 214 is also connected to the permanent magnet 221. The opposing portion has a plurality of pole teeth 214a arranged along the circumferential direction at the same pitch as the pole teeth 213a. The pole teeth 213a and the pole teeth 214a are alternately arranged in the circumferential direction. Further, the outer yoke 213 of this embodiment also serves as a case member of the motor 200.

  The permanent magnet 221 is a rare earth magnet such as a ferrite magnet having N poles and S poles alternately magnetized in the circumferential direction, or a neodymium magnet similarly magnetized. The permanent magnet 221 of this embodiment is formed in a cylindrical shape, and is bonded and fixed to the outer peripheral surface of the base end portion 300 b of the lead screw 300. The permanent magnet 221 is a single member and has a cylinder length that can face each of the two-phase stators 210.

  In addition, the motor 200 includes a bearing member 231 that supports the base end portion 300b of the lead screw 300, and a plate spring 240 as a biasing member that biases the lead screw 300 toward the distal end side by the elastic force of the spring portion 241. I have. The bearing member 231 and the leaf spring 240 are attached to the upper surface of the motor 200 as viewed in FIG.

  The motor of the present invention is not limited to the motor 200, and other motors can be used on the condition that the driving force for rotating the feed screw can be output. Moreover, although the motor 200 of this embodiment is a direct drive motor that directly rotates the lead screw 300, the feed screw of the present invention may be separated from the motor. For example, the motor driving force may be reduced by a reduction gear train and transmitted to the feed screw.

[Configuration of lead screw and screw nut]
The lead screw 300 is a rotating shaft formed of a metal such as stainless steel, aluminum or brass, or a resin. The lead screw 300 has a base end portion 300a housed in the motor 200 (see FIG. 3), and a tip end portion 300a supported by a bearing member 423 provided in the frame body 400 (see FIG. 2). A spiral groove is formed on the outer peripheral surface of the lead screw 300, and a screw nut 350 is screwed into the spiral groove. When power is supplied to the terminal 260 of the motor 200 and the motor 200 is driven, the screw nut 350 reciprocates in the extending direction of the lead screw 300.

  The screw nut 350 of the present embodiment is formed of a metal such as resin or copper. The screw nut 350 is a flat plate member having a substantially rectangular plate surface, and each apex (corner portion) in the circumferential direction is rounded into a curved surface. The lead screw 300 penetrates the screw nut 350 in the thickness direction.

[Frame structure]
Hereinafter, the configuration of the frame 400 will be described with reference to FIGS. 1 and 2. In the following description, the “axial direction” refers to the axial direction of the lead screw 300 supported by the frame 400, and refers to the direction parallel to the X-axis direction of the coordinate axis display shown in each drawing. “Upper”, “lower”, and “height” refer to the vertical direction in the Z-axis direction of the same coordinate axis display. The “normal position” refers to an appropriate angular position of the screw nut 350 when the movable part P is assembled to the screw nut 350.

  The frame 400 of this embodiment is a single sheet metal member. The frame 400 mainly includes a base portion 410 and an upright portion 420. The base portion 410 is a flat plate portion disposed with its upper surface 410a, which is one of its plate surfaces, facing the lead screw 300, and has a screw hole 432 for fixing the frame 400 to another member. The upright portion 420 is a portion bent upward from the base portion 410, and supports the lead screw 300 in parallel with the base portion 410. The upright portions 420 are provided at both ends of the base portion 410 in the axial direction, and include a shaft support portion 421 that supports the distal end portion 300 a of the lead screw 300 and a motor attachment portion 422 that supports the motor 200.

(Convex)
The upper surface 410a of the base 410 is provided with a convex portion 411 in which the position of the distal end surface (the top portion 411a) protrudes further from the upper surface 410a toward the lead screw 300. The convex portion 411 of the present embodiment is formed by performing a half blanking process on the base portion 410. The screw nut 350 is disposed on the convex portion 411, so that the inclination of the angular position is limited. Note that the method of forming the convex portion 411 is not limited to the half punching process, and the upper surface 410a of the base portion 410 may be pushed up by another method. Further, the convex portion 411 may be formed by attaching another member to the upper surface 410 a of the base portion 410.

  As shown in FIGS. 1 and 2, the convex portion 411 of the present embodiment has a top portion 411 a made of a rectangular plane substantially parallel to the upper surface 410 a of the base portion 410, and each side surface of the convex portion 411 is The base 410 extends substantially vertically from the upper surface 410a toward the top 411a. The top portion 411a is formed to have substantially the same size as the lower surface 350a of the screw nut 350. 2 indicates the movable range NS of the screw nut 350, and the arrow PS indicates the effective movable range PS that is the movable range of the movable component P during normal use. An arrow WS is a difference between the movable range NS and the effective movable range PS, and indicates a work range WS used only when the movable part P is assembled to the screw nut 350.

  The motor device 10 according to the present embodiment includes a screw nut 350 and a base portion so that the screw nut 350 and the movable part P assembled to the screw nut 350 reciprocate in the extending direction of the lead screw 300 so as not to contact the base portion 410. A gap is provided between the two and 410. The screw nut 350 before the movable part P is assembled is in a state in which the angular position is not stable due to this gap, and is easily inclined in either of the circumferential directions. When assembling the movable part P while manually maintaining such a nut member in a normal position, for example, when the nut member is small, or when the nut member is disposed in a narrow space or a position where visibility is difficult, the assembly work is complicated. There is a risk of becoming.

  In the motor device 10 of the present embodiment, a convex portion 411 that limits the inclination of the screw nut 350 is formed in the movable range NS of the screw nut 350, and the screw nut 350 is disposed on the convex portion 411. The angular position of the screw nut 350 can be maintained regardless of human hands. Thereby, the movable part P can be efficiently assembled to the screw nut 350. In the present embodiment, a slight gap is also provided between the lower surface 350a of the screw nut 350 and the top 411a of the convex portion 411. However, this gap is not essential, and the convex portion 411 is connected to the screw nut 350. You may make it the height which can always contact.

  Moreover, the convex part 411 of this embodiment is arrange | positioned in the end part vicinity in the movable range NS of the screw nut 350. FIG. More specifically, the convex portion 411 is disposed at a position spaced from the shaft support portion 421 by a distance of about the thickness of the screw nut 350.

  After the movable part P is assembled to the screw nut 350, when the screw nut 350 passes over the convex portion 411, vibration of the apparatus in which the motor device 10 is incorporated, or being pressed by the movable part P, the screw The nut 350 may come into contact with the convex portion 411. Therefore, in the motor device 10 of the present embodiment, the convex portion 411 is disposed outside the effective movable range PS of the movable component P, and the formation range (working range WS) of the convex portion 411 is used only when the movable component P is assembled. This prevents contact between the screw nut 350 and the convex portion 411 after the movable part P is assembled. In addition, when the contact of the screw nut 350 and the convex part 411 does not become a problem, you may arrange | position the convex part 411 within the effective movable range PS. Even in that case, since the convex part 411 of this embodiment is arrange | positioned in the end part vicinity of the movable range NS, the influence by the contact with the screw nut 350 and the convex part 411 is suppressed low.

  In addition, the screw nut 350 of the present embodiment has a lower surface 350a that is a surface facing the convex portion 411 that is a flat surface. Thereby, even if it is the convex part 411 of simple structure like the convex part 411 of this embodiment, it is enabled to restrict | limit the inclination of the screw nut 350 effectively.

(Modified example of convex part)
FIG. 4 and FIG. 5 are a side view and a plan view showing a structure of a convex portion 412 and a convex portion 413 which are modified examples of the convex portion 411. In the following description, components having the same or similar functions as those of the previous embodiment are denoted by the same reference numerals as those of the previous embodiment, and detailed description thereof is omitted.

  4 has a slope 412b that gently slopes from the upper surface 410a of the base 410 toward the top 412b, in addition to a top 412b that is a flat surface. The slope 412b is an inclined surface that guides to the top 412a while correcting the screw nut 350 to a normal position when the screw nut 350 having an inclined angular position rides on the slope 412b.

  When the screw nut 350 is moved by the lead screw 300, a frictional force that tilts the screw nut 350 acts on the rotation direction side of the lead screw 300. For example, when the side surface is a vertical surface like the convex portion 411 of the above-described embodiment, the inclined portion of the screw nut 350 may be engaged with the side surface of the convex portion 411, and the screw nut 350 may not be movable. is there. When this state occurs during the assembly work of the movable part P, it is necessary to manually correct the angular position of the screw nut 350 to the correct position and place it on the top portion 411a. If this state occurs after the assembly of the movable part P, there is a risk of causing problems in the operation of the apparatus.

  Since the convex portion 412 of this modification has a slope 412b, it is possible to prevent the engagement with the convex portion 412 when the screw nut 350 is moved.

  In addition to having the slope 413b, the convex part 413 of FIG. 5 is formed linearly in a direction orthogonal to the axial direction. Here, the “linear top” means that one of the vertices of the convex portion is the top like the convex portion 413, or a top portion that is made of a plane that is thin enough to conform to the line.

  The top part of the convex part of this invention should just be what can prevent the inclination of a nut member, and does not need to be a surface. Moreover, since the lower surface 350a of the screw nut 350 of this embodiment is comprised by the plane, even if it is the linear top part 413a, the inclination of the screw nut 350 can be restrict | limited.

  In general, for reasons such as downsizing, it is desirable that the entire length of the lead screw 300 be usable as the effective movable range of the movable part P. As for the convex part 413 of this modification, the arrangement | positioning range of the top part 413a is minimized because the top part 413a is formed in linear form. Thereby, it is possible to achieve both the securing of the effective movable range of the movable part P and the efficiency of the work of assembling the movable part P to the screw nut 350.

  In addition, the convex part 411 of the said embodiment and the convex parts 412 and 413 concerning a modification are arrange | positioned in the position a little away from the edge part in the movable range of the screw nut 350 on account of the assembly | attachment operation | work of the movable component P. Yes. In the case where there is no such work restriction, it is possible to secure a wider effective movable range of the movable component P by further bringing the convex portion closer to the end of the movable range.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. For example, in the frame 400 of the above embodiment, the base portion 410, the standing portion 420, and the convex portion 411 are integrally formed as a single sheet metal member, but the frame body of the present invention is configured by combining separate members. May be. Moreover, although the lead screw 300 of the said embodiment is arrange | positioned in parallel with respect to the base part 410, the feed screw of this invention does not necessarily need to be always parallel to a base part, and may be arrange | positioned a little. Moreover, although the screw nut 350 of embodiment is a flat plate member which has a substantially rectangular plate surface, and the lower surface 350a is comprised by the plane, the nut member of this invention may be made into shapes other than a rectangle. . The contact portion of the nut member with the convex portion need not always be a surface, and may be, for example, a protruding portion as long as the inclination of the nut member can be limited. Similarly, the top of the convex portion of the present invention is not limited to a planar shape or a linear shape, and may be configured to support the nut member at a plurality of points, for example.

10 Motor device 200 Motor 300 Lead screw (feed screw)
300a distal end portion 300b proximal end portion 350 screw nut (nut member)
400 frames
410 base 410a upper surface 411,412,413 convex part 411a, 412a, 413a top part 412b, 413b slope (inclined surface)
420 Standing portion 421 Shaft support portion 422 Motor mounting portion P Movable member (other parts)

Claims (7)

A motor as a drive source;
A feed screw that rotates by the driving force of the motor;
A nut member attached to the feed screw;
A frame that supports the feed screw,
The frame body has a base portion arranged along the axial direction of the feed screw,
The base is formed with a protrusion protruding toward the feed screw,
The motor device according to claim 1, wherein the nut member is disposed on the convex portion to limit the inclination of the angular position. The base portion is a flat plate portion arranged with the upper surface being one plate surface facing the feed screw side,
The frame supports the feed screw in parallel with the base,
The motor device according to claim 1, wherein the convex portion is a portion in which a surface position of an upper surface of the base portion protrudes toward the feed screw.   3. The motor device according to claim 1, wherein the convex portion is formed at one end of a movable range in the reciprocating direction of the nut member or in the vicinity thereof. 4.   The said convex part is formed outside the effective movable range which is a movable range of the other components assembled | attached to this nut member among the movable ranges in the reciprocating direction of the said nut member. The motor device according to claim 3.   The convex portion has an inclined surface that guides the nut member to a top portion of the convex portion while correcting the angular position of the nut member when the nut member rides on the convex portion. The motor device according to claim 4.   The top part of the said convex part is formed in linear form in the direction orthogonal to the axial direction of the said feed screw in the upper surface of the said base part, The Claim 1 characterized by the above-mentioned. Motor device.   The surface facing the said convex part of this nut member when the said nut member is arrange | positioned on the said convex part is a plane, It is any one of Claims 1-6 characterized by the above-mentioned. Motor device.

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