JP2016156422A - Drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive device which can be further downsized as a whole, without deteriorating the operation accuracy of a door member.SOLUTION: A drive device 10 includes: a screw 100 rotated with a rotary shaft MX of a motor M; a slider 200 disposed so as to surround at least a part of the screw 100 from the outside; a door shaft 310 disposed so as to surround at least a part of the slider 200 from the outside; a first conversion mechanism which rotates the slider 200 about a center axis CS at rotary speed slower than the rotary speed of the screw 100 while moving the slider 200 in a direction along the center axis CA, by rotations of the screw 100 about the center axis CA; and a second conversion mechanism which rotates the door shaft 310 about the center axis XA by rotations of the slider 200. A door member 350 is driven in conjunction with the rotary movement of the door shaft 310.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a drive device that drives a door member.

  The air conditioner is provided with a door member for switching a flow path through which air passes. As such a door member, for example, there is a member (air mix door) for adjusting the temperature of air by changing the amount of air passing through a heater. In the case of an air conditioner mounted on a vehicle, a door for switching between a flow path of air blown toward the driver's upper body and a flow path of air blown toward the driver's feet There are parts.

  The air conditioner is often provided with a drive device that drives the door member by the drive force of a motor (rotary electric machine) so that the flow path is switched automatically instead of manually. Such a drive device has a structure having a speed reduction mechanism in addition to the motor. The deceleration mechanism is a mechanism for converting the rotation of the rotating shaft of the motor into an opening / closing operation of the door member. The driving force of the motor is decelerated by the deceleration mechanism and the torque is increased and transmitted to the door member.

  In recent years, there has been a strong demand for downsizing particularly air conditioners mounted on vehicles, and door members and driving devices are also required to be downsized. In order to respond to this, Patent Document 1 below proposes a drive device having a structure in which a speed reduction mechanism is housed inside a cylindrical portion (shaft) serving as a rotating shaft among door members of a rotating door.

  The drive device includes a first screw connected to the rotating shaft of the motor, and a second screw disposed away from the first screw along the axial direction of the rotating shaft. In addition, a slider is further provided with one end screwed into the first screw and the other end screwed into the second screw. When the first screw is rotated by the driving force of the motor, the rotational motion is converted into the linear motion of the slider, and the linear motion is converted into the rotational motion of the second screw. Since the second screw is connected and fixed to one end of the door member, the door rotates (opens and closes) in conjunction with the rotation of the second screw.

  In the drive device described in Patent Document 1 below, the reduction mechanism as described above for converting the rotational movement of the rotating shaft of the motor into the opening / closing operation of the door member is provided inside the columnar portion serving as the rotating shaft of the door member. It has a stored configuration. For this reason, for example, as compared with a configuration in which the speed reduction mechanism is disposed outside the space (air flow path) in which the door member is accommodated, the entire drive device including the speed reduction mechanism can be reduced in size.

International Publication No. 2013/190074

  In the drive device described in Patent Document 1, a conversion mechanism for converting the rotational motion of the first screw into the linear motion of the slider, and a conversion mechanism for converting the linear motion of the slider into the rotational motion of the second screw; Are arranged so as to be spaced apart from each other along the central axis of the rotation axis of the motor. For this reason, it has been difficult to further reduce the size by reducing the dimension in the direction along the central axis.

  Moreover, in order for the linear motion of the slider to be performed smoothly, the first screw and the second screw need to be arranged so that their central axes coincide with each other. However, since these are configured as separate parts, there is a possibility that the respective central axes may be displaced due to variations during assembly. As a result, the linear motion of the slider is hindered, and the operation accuracy (positioning accuracy) of the door member may be deteriorated.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a drive device that can be further reduced in size without deteriorating the operation accuracy of the door member.

  In order to solve the above problems, a drive device according to the present invention is a drive device for driving a door member (350), and includes a motor (M) having a rotation shaft (MX) and a rod-like member. A first member (100) that rotates together with the rotation shaft, a second member (200) disposed so as to surround at least a part of the first member from the outside, and at least a part of the second member from the outside. While the second member is moved in the direction along the central axis by the rotation of the first member around the central axis (CA) of the third member (310) arranged to surround and the rotational axis, the first member The first conversion mechanism (110, 210, 220, 422) that rotates the second member around the central axis at a rotational speed slower than the rotational speed, and the third member by rotation of the second member around the central axis (CA) The second variation that rotates the axis around the central axis Comprising a mechanism (230,313), and is characterized in that in conjunction with the rotational movement of the third member is driven door member are configured to be performed.

  In the drive device configured as described above, when the first member is rotated by the driving force of the motor, the rotational movement of the first member is converted into the movement of the second member by the first conversion mechanism. The second member rotates around the central axis at a rotational speed slower than the rotational speed of the first member while moving in the direction along the central axis.

  Such movement of the second member is converted into movement of the third member by the second conversion mechanism. The third member rotates around the central axis similarly to the second member. The door member is driven in conjunction with the rotational movement of the third member. The first member, the second member, and the third member are arranged in this order from the central axis of the motor toward the outside.

  In the configuration as described above, the first conversion mechanism and the second conversion mechanism do not need to be spaced apart from each other along the central axis of the motor. Can be placed. For this reason, the dimension along the central axis of the motor can be shortened.

  The second member is disposed so as to surround at least a part of the first member from the outside, and the third member is disposed so as to surround at least a part of the second member from the outside. In such a configuration, the main components of the driving device are not arranged so as to be divided into a plurality along the central axis of the motor. For this reason, it is prevented that the position of several components shifts | deviates at the time of an assembly, and it prevents that the operation | movement accuracy of a door member deteriorates.

  ADVANTAGE OF THE INVENTION According to this invention, the drive device which can further reduce in size the whole is provided, without deteriorating the operation | movement precision of a door member.

It is a perspective view which shows the drive device which concerns on 1st Embodiment of this invention. It is a figure which shows typically the internal structure of the drive device shown by FIG. It is a figure which shows the slider of the drive device shown by FIG. It is a figure which shows the shape of the groove | channel formed in the inner surface of a motor folder among the drive devices shown by FIG. It is a figure which shows the shape of the groove | channel formed in the inner surface of a door shaft among the drive devices shown by FIG. It is a figure which shows the modification of the shape of the groove | channel formed in the inner surface of a motor folder. It is a figure which shows the modification of the shape of the groove | channel formed in the inner surface of a motor folder. It is a figure which shows typically a part of drive device which concerns on 2nd Embodiment of this invention. It is a figure for demonstrating the function of a door member and a drive device.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In order to facilitate the understanding of the description, the same constituent elements in the drawings will be denoted by the same reference numerals as much as possible, and redundant description will be omitted.

  The drive device 10 according to the first embodiment of the present invention will be described. The drive device 10 forms part of the vehicle air conditioner, and is housed in a casing CS that divides the air flow path, as shown in FIG. The driving device 10 is a device for driving the door member 350 for regulating the air flow and changing the air flow. In the present embodiment, the door member 350 to be driven is formed integrally with a component (a door shaft 310 described later) constituting the driving device 10.

  Before describing the specific configuration of the drive device 10, the functions of the drive device 10 and the door member 350 in the air conditioner will be briefly described with reference to FIG.

  A plurality of flow paths through which air passes are formed inside the casing CS formed of resin. Specifically, as shown in FIGS. 9A and 9B, an upper flow path FP1 and a lower flow path FP2 are formed.

  The flow path FP1 is a flow path for guiding air so that air from a blower (not shown) arranged on the upstream side (left side in FIG. 9) is blown out toward the upper body of the driver. The flow path FP2 is a flow path for guiding the air so that the air from the blower is blown out toward the driver's feet. In FIG. 9, the air from the blower flows from the left side to the right side in any flow path.

  FIG. 9A shows a state in which air is blown out toward the feet of the driver, that is, a state in which the air blowing is switched to the “FOOT side” by the driver's operation. At this time, the entire entrance of the flow path FP1 is closed by the door member 350. For this reason, the air from the blower does not flow into the flow path FP1, but flows into the flow path FP2 and is supplied to the driver's feet through the flow path FP2.

  FIG. 9B shows a state in which air is blown out toward the upper body of the driver, that is, a state in which the air blowing is switched to the “FACE side” by the driver's operation. At this time, the entire inlet of the flow path FP2 is closed by the door member 350. For this reason, the air from the blower does not flow into the flow path FP2, but flows into the flow path FP1 and is supplied to the upper body side of the driver through the flow path FP1.

  Switching between the state shown in FIG. 9A and the state shown in FIG. 9B is performed by driving the door member 350 by the driving device 10. Specifically, the state is switched as the door member 350 rotates around the central axis of the door shaft 310.

  Thus, the position of the door member 350 (rotation angle in the present embodiment) is changed by the driving device 10, and the flow path through which the air flows is switched from the FOOT side to the FACE side or from the FACE side to the FOOT side. The drive device 10 can be applied not only to a flow path switching mechanism as shown in FIG. 9 but also to various types of conventionally known flow path switching mechanisms (for example, air mix doors). In the following description, only the specific configuration and operation of the drive device 10 will be described, and illustration and description of the specific form of the flow path in which the drive device 10 and the door member 350 are arranged will be omitted.

  A specific configuration of the driving device 10 will be described with reference to FIGS. 1 and 2. The drive device 10 includes a motor M, a motor folder 400, a screw 100, a slider 200, and a rotary door 300, and substantially all of the drive device 10 is disposed inside the casing CS (a flow path through which air passes). Yes.

  In FIG. 1, only the portion of the casing CS to which the driving device 10 is attached and the vicinity thereof are shown, and the other portions of the casing CS are not shown. Further, FIG. 1 shows a state in which a part (front side portion) of each of the slider 200, the rotary door 300, and the motor folder 400 is cut so that the internal structure of the driving device 10 is clarified. Yes.

  FIG. 2 shows a state where the door member 350 rotates and the normal direction of the main surface thereof is horizontal so that the entire shape of the door member 350 is shown in a cross section.

  The motor M is a rotating electrical machine having a substantially cylindrical housing. The motor M is a source of driving force necessary for opening and closing the door member 350. The motor M is fixed to the inner surface of the casing CS in a state where the rotation axis MX is directed in the horizontal direction and toward the inside of the casing CS. Specifically, it is fixed to the casing CS via the motor folder 400 while being held and fixed in a motor folder 400 described later. When the motor M is driven by a control device (not shown), the rotation axis MX is rotated around its central axis (central axis CA) by the driving force of the motor M.

  In the present embodiment, the motor M is a DC motor. In carrying out the present invention, the motor M is not necessarily a DC motor, and various rotating electrical machines having a rotating shaft (output shaft) such as a step motor and a brushless motor can be employed. When the drive device 10 is a part of an automotive air conditioner, it is desirable that the motor M has a specification that operates by supplying 12V or 24V power.

  In FIG. 1, the x axis is set with the x direction as the direction from the motor M toward the rotary door 300 along the central axis CA. Further, the y axis is set with the y direction being the horizontal direction and the direction perpendicular to the x direction. Further, the z-axis is set with the direction going vertically upward as the z direction. In the subsequent drawings, the x axis, the y axis, and the z axis are similarly set.

  The motor folder 400 is a member for holding the motor M. The motor folder 400 is formed in a substantially cylindrical shape, and is arranged in a state where the central axis thereof coincides with the central axis CA of the rotation axis MX. The motor folder 400 has a large diameter part 410 and a small diameter part 420.

  The large diameter portion 410 is a portion on the −x direction side of the motor folder 400. The inner diameter of the large diameter portion 410 is substantially the same as the outer diameter of the casing of the motor M. The housing of the motor M is fixed to the large diameter portion 410 with the entire outer peripheral surface thereof being in contact with the inner peripheral surface of the large diameter portion 410.

  In addition, as a fixing method of the motor M, it is not limited to such an aspect, A various fixing method is employable. For example, a mode in which a plurality of protrusions are formed on the inner peripheral surface of the large-diameter portion 410 and only the tips of the protrusions are in contact with the housing of the motor M may be employed.

  The vicinity of the end on the −x direction side of the large-diameter portion 410 is inserted into a circular through hole formed in the wall surface of the casing CS, and is fixed to the casing CS. As described above, the casing of the motor M is fixed to the casing CS via the large diameter portion 410 of the motor folder 400. For this reason, the housing of the motor M is prevented from sliding in the x direction and rotating around the central axis CA.

  The small-diameter portion 420 is a portion on the x direction side of the motor folder 400. The inner diameter of the small diameter portion 420 is smaller than the inner diameter of the large diameter portion 410 and slightly larger than the outer diameter of the slider 200. Three grooves 422 are formed on the inner peripheral surface 440 of the small diameter portion 420 so as to surround the central axis CA in a spiral manner. Note that the number of the grooves 422 need not be limited to three, and a plurality of four or more grooves 422 may be formed at equal intervals. Alternatively, one or two grooves 422 may be formed.

  As will be described in detail later, these grooves 422 guide the movement of the slider 200 when the motor M is driven. That is, the motor folder 400 has both a function of holding the motor M and fixing it to the casing CS and a function of guiding the movement of the slider 200. In the following description, the internal space of the small diameter portion 420 is also referred to as “internal space 421”.

  In the present embodiment, the motor folder 400 is formed by resin molding. The motor folder 400 may be formed integrally with the casing CS. Further, instead of such a mode, a mode in which the motor folder 400 having a shape as shown in FIG. 2 is integrally formed with the housing of the motor M may be employed. In this case, the motor folder 400 (formed integrally) and the motor M are fixed to the casing CS.

  The screw 100 is a rod-shaped (columnar) member having one end fixed to the rotation axis MX. The screw 100 is arranged in a state in which the central axis thereof coincides with the central axis CA of the rotation axis MX. A recess (not shown) is formed on the end surface of the screw 100 on the side opposite to the motor M. A projection HP formed on the casing CS is accommodated in the recess. The screw 100 is held in a rotatable state by the protrusion HP.

  The configuration for holding the screw 100 is not limited to this, and various configurations can be adopted. For example, a cylindrical bearing portion formed on the inner surface (surface on the screw 100 side) of the casing CS may support the screw 100 from the outer peripheral side. Moreover, it is good also as a structure by which the screw 100 is penetrated by the through-hole formed in the casing CS, and the screw 100 is hold | maintained by this.

  A screw-like protrusion 110 is formed on substantially the entire outer peripheral surface of the screw 100. When the motor M is driven and the rotating shaft MX rotates, the screw 100 also rotates around the central axis CA. In the present embodiment, the screw 100 is formed by resin molding, but the screw 100 may be a metal part.

  The slider 200 is a substantially cylindrical member, and is arranged in a state where the central axis thereof coincides with the central axis CA of the rotation axis MX. The inner diameter of the slider 200 is substantially equal to the outer diameter of the screw 100. A spiral groove 210 is formed on the inner peripheral surface of the slider 200. A screw 100 is inserted through the slider 200, and the protrusion 110 of the screw 100 and the groove 210 of the slider 200 are screwed together.

  The shapes of the screw 100 and the slider 200 are not formed as described above. If the screw 100 is rotated around the central axis CA, various configurations are adopted as long as the rotation is converted into a smooth linear movement (movement in the direction along the central axis CA) of the slider 200. Can do. For example, a mode in which columnar protrusions formed on the surface of the screw 100 are accommodated in a spiral groove formed on the inner surface of the slider 200 may be employed. In the present embodiment, the slider 200 is formed by resin molding, but the slider 200 may be a metal part.

  Part of the slider 200 (near the end on the −x direction side) is always stored in the internal space 421 of the small diameter portion 420. Three protrusions 220 projecting outward are formed in the vicinity of the end on the −x direction side of the outer peripheral surface of the slider 200. As shown in FIG. 3, the protrusions 220 are arranged so as to be equally spaced from each other when viewed along the x-axis. That is, the three straight lines connecting the central axis CA and the respective protrusions 220 are arranged at positions where they intersect each other at an angle of 120 degrees.

  Each protrusion 220 is accommodated in three grooves 422 formed on the inner peripheral surface 440 of the small diameter portion 420. In other words, on the inner peripheral surface 440 of the small diameter portion 420, the respective grooves 422 are formed at positions where the respective protrusions 220 arranged as shown in FIG. 3 are accommodated.

  As already described, the number of grooves 422 need not be limited to three, and four or more or two or less (that is, one or more) grooves 422 may be formed. In any case, the same number of protrusions 220 as the number of grooves 422 are formed on the outer peripheral surface of the slider 200 at positions corresponding to the grooves 422. In addition, it is desirable that the grooves 422 and the protrusions 220 are arranged at equal intervals, but they may not be equally spaced.

  FIG. 4 is a diagram showing the shape and arrangement of the grooves 422 formed in the inner peripheral surface 440 of the small diameter portion 420. FIG. 4 shows the entire inner peripheral surface 440 (which is a cylindrical curved surface) developed and drawn. The upper side and the lower side in FIG. 4 are actually connected. The same applies to FIGS. 6 and 7 used for later description.

  As shown in FIG. 4, the three grooves 422 formed on the inner peripheral surface 440 are arranged in parallel and at equal intervals. Each of the grooves 422 is formed such that the angle formed by the longitudinal direction with respect to the central axis CA is θ1.

  Since the protrusion 220 is housed in the groove 422, free rotation of the slider 200 around the central axis CA is suppressed. That is, even when the motor M is driven, the slider 200 does not rotate at the same rotational speed as the screw 100.

  When the motor M is driven and the screw 100 is rotated, a force along the x axis (center axis CA) is applied to the groove portion 210 of the slider 200 from the protrusion 110 of the screw 100. For this reason, the slider 200 moves along the x-axis. At this time, the protrusion 220 moves along the groove 422 while being accommodated in the groove 422.

  The slider 200 is guided so that the protrusion 220 moves along the groove 422. For this reason, the slider 200 rotates around the central axis CA while moving in a direction along the central axis CA. The rotational speed at this time is smaller than the rotational speed of the screw 100. The movement of the slider 200 as described above is shown, and is hereinafter also referred to as “translational rotation”.

  As described above, the rotational movement of the screw 100 is converted into the translational rotational movement of the slider 200 because the protrusion 110 and the groove 210 are screwed together and the protrusion 220 is accommodated in the groove 422. The The protrusion 110, the groove 210, the protrusion 220, and the groove 422 correspond to the “first conversion mechanism” of the present invention.

  The rotary door 300 includes a door shaft 310 and a door member 350, which are integrally formed by resin molding.

  The door shaft 310 is a portion formed in a substantially cylindrical shape, and is arranged in a state where the central axis thereof coincides with the central axis CA of the rotation axis MX. The door shaft 310 surrounds substantially the entire screw 100 from the outside.

  A portion of the door shaft 310 that surrounds the small diameter portion 420 of the motor folder 400 from the outside (a portion on the −x direction side from the dotted line DL1 in FIG. 2) has an inner diameter slightly smaller than the outer diameter of the small diameter portion 420. It is getting bigger. Further, in the door shaft 310, a portion further on the x direction side than the end portion on the x direction side of the small diameter portion 420 (a portion on the x direction side with respect to the dotted line DL <b> 1 in FIG. 2) has an inner diameter larger than the outer diameter of the slider 200. Is slightly larger. In the following description, the inner peripheral surface of the portion of the door shaft 310 (the x direction side from the dotted line DL1) is also referred to as an “inner peripheral surface 340”.

  Of the internal space of the door shaft 310, a portion on the −x direction side from the dotted line DL1 (portion in which the small diameter portion 420 is accommodated) is also referred to as “internal space 311” below. In addition, in the internal space of the door shaft 310, the portion on the x direction side from the dotted line DL1 is also referred to as “internal space 312” below.

  A part of the slider 200 (near the end on the x direction side) is always disposed in the internal space 312 of the door shaft 310. Three protrusions 230 projecting outward are formed in the vicinity of the end on the x-direction side of the outer peripheral surface of the slider 200. Similar to the protrusions 220 described with reference to FIG. 3, the protrusions 230 are arranged at equal intervals when viewed along the x-axis. That is, the three straight lines connecting the central axis CA and the respective protrusions 230 are arranged at positions that intersect each other at an angle of 120 degrees.

  Three linear grooves 313 extending along the x direction are formed on the inner peripheral surface 340 of the door shaft 310. Each protrusion 230 is housed in each of these grooves 313. In other words, each groove 313 is formed in the inner peripheral surface 340 at a position where each projection 230 arranged as shown in FIG. 3 is accommodated.

  The number of grooves 313 need not be limited to three, and four or more or two or less (that is, a single or plural) grooves 313 may be formed. Similarly, the number of protrusions 230 need not be limited to three, and four or more or two or less protrusions 230 may be formed. In any case, the same number of protrusions 230 as the number of grooves 313 are formed on the outer peripheral surface of the slider 200 at positions corresponding to the grooves 313. In addition, the grooves 313 and the protrusions 230 are desirably arranged at equal intervals, but may not be equally spaced.

  FIG. 5 is a view showing the shape and arrangement of the groove 313 formed in the inner peripheral surface 340 of the door shaft 310. FIG. 5 shows the entire inner peripheral surface 340 (which is a cylindrical curved surface) developed. The upper side and the lower side in FIG. 5 are actually connected.

  As shown in FIG. 5, the three grooves 313 formed on the inner peripheral surface 340 are arranged in parallel to each other at equal intervals. In addition, each groove 313 is formed such that the angle formed by the longitudinal direction with respect to the central axis CA is zero. That is, the longitudinal direction of each groove 313 is parallel to the central axis CA (x axis).

  As already described, when the motor M is driven and the screw 100 rotates, the rotation is converted into the translational rotary motion of the slider 200. Each protrusion 230 of the slider 200 rotates around the central axis CA while moving in the direction along the central axis CA. For this reason, a force is applied by the protrusion 230 to the inner surface of the groove 313 in which the protrusion 230 is accommodated. The door shaft 310 rotates around the central axis CA by the force.

  Since the longitudinal direction of the groove 313 is parallel to the central axis CA, the force applied to the inner surface of the groove 313 by the protrusion 230 is a force (rotational force) that rotates the door shaft 310 around the central axis CA. It becomes only. In other words, a force (straight forward force) that moves the door shaft 310 in the direction along the central axis CA is not applied to the door shaft 310.

  As described above, the translational rotary motion of the slider 200 is converted into the rotary motion of the door shaft 310 (the rotary door 300) by housing the protrusion 230 in the linearly formed groove 313. Each of the protrusions 230 and the grooves 313 corresponds to the “second conversion mechanism” of the present invention.

  As already described with reference to FIG. 9, the door member 350 is a member for switching the flow path through which air flows in the air conditioner. The door member 350 is a substantially rectangular plate-like body, and is formed so as to extend outward from the outer peripheral surface of the door shaft 310. Further, a boundary portion between the door member 350 and the door shaft 310 extends over substantially the entire door shaft 310 along the x axis.

  When the motor M is driven and the screw 100 is rotated, the door shaft 310 is rotated by the first conversion mechanism and the second conversion mechanism described so far, and the door member 350 is rotated in conjunction therewith. That is, the flow path switching (opening / closing) as described with reference to FIG. 9 is performed.

  In the drive mechanism 10 according to the present embodiment, the rotation of the rotation shaft MX of the motor M is transmitted to the door member 350 via two mechanisms (a first conversion mechanism and a second conversion mechanism). Specifically, the rotation of the rotation axis MX is decelerated by the first conversion mechanism, and the slider 200 is translated and rotated. Of this translational rotary motion, only the rotary motion around the central axis CA is transmitted to the door member 350 by the second conversion mechanism.

  The range in which the first conversion mechanism is arranged (screw 100 and slider 200) and the range in which the second conversion mechanism is arranged (slider 200 and door shaft 310) are along the x direction. Are not separated from each other and overlap along the x-axis. It can also be said that the first conversion mechanism and the second conversion mechanism are arranged so as to overlap each other along the radial direction of the door shaft 310.

  Since the first conversion mechanism and the second conversion mechanism are arranged in this way, it is possible to shorten the overall dimension of the drive device 10 along the x-axis. In other words, even if the internal dimension of the flow path is small, substantially the entire drive device 10 can be accommodated in the flow path.

  The slider 200 is arranged so as to surround the screw 100 from the outside, and the door shaft 310 is arranged so as to surround the slider 200 from the outside. Further, the small diameter portion 420 of the motor folder 400 surrounds the slider 200 from the outside and is surrounded by the door shaft 310 from the outside. Thus, the main components of the drive device 10 are not arranged so as to be divided into a plurality along the central axis CA, but are arranged so as to overlap each other in the radial direction (direction perpendicular to the central axis CA). ing. For this reason, it is prevented that the position of a some component shifts | deviates at the time of an assembly, and it is prevented that the operation | movement accuracy of the door member 350 deteriorates.

  By the way, in order to prevent the rotational motion of the door member 350 from being hindered by friction or the like, it is necessary to form a certain gap between the door member 350 and the inner wall surface of the casing CS. As a result, the position of the door member 350 in the x direction is not completely regulated, and a certain amount of play (variation in position along the x direction) occurs in the door member 350. That is, when the motor M is not driven, the door member 350 may move in the direction along the x axis (thrust direction).

  If the groove 313 is formed in a spiral shape, when the door member 350 moves in the thrust direction, the rotation angle (that is, the opening) of the door member 350 changes accordingly. Although the motor M is not driven, changing the opening of the door member 350 is undesirable because it causes a change in the flow rate of air passing through the casing CS.

  On the other hand, in the present embodiment, the groove 313 is not formed in a spiral shape, but is formed in a linear shape along the central axis CA. Therefore, even if the door member 350 moves in the thrust direction due to the backlash, no force in the rotational direction is applied to the inner wall surface of the groove 313, and the door member 350 rotates around the central axis CA. There is no end to it. In the present embodiment, it is possible to maintain the opening degree of the door member 350 with high accuracy while allowing the backlash to occur in the thrust direction.

  In the present embodiment, a groove 422 for guiding the movement of the slider 200 is formed in the small diameter portion 420 of the motor folder 400. However, the embodiment of the present invention is not limited to this. For example, the motor folder 400 may have only a function of holding the motor M, and the movement of the slider 200 may be guided by a member different from the motor folder 400. For example, a part of the casing CS may extend along the outer peripheral surface of the slider 200, and a groove (corresponding to the groove 422) for accommodating the protrusion 220 may be formed in the part.

  Further, the door shaft 310 and the door member 350 may not be integrally formed, but may be connected to each other after being formed as separate parts.

  In the present embodiment, the three protrusions 220 are formed on the slider 200, but the number of the protrusions 220 may not be three. For example, the number of the protrusions 220 may be four. In this case, it is desirable that the four straight lines connecting the central axis CA and the respective protrusions 220 intersect with each other at an angle of 90 degrees.

  Moreover, the aspect in which only one protrusion 220 is formed may be used. However, in this case, the protrusion 220 is pressed against the inner surface of the groove 422 with a strong force. It is also conceivable that the force that the slider 200 receives from the entire small-diameter portion 420 acts in a direction in which the central axis of the slider 200 and the central axis of the small-diameter portion 420 are shifted. In view of this point, it is desirable that the plurality of protrusions 220 are arranged at equal intervals from each other as in the present embodiment.

  The protrusions 230 are the same as described above, and the number of the protrusions 230 is not limited to three, and may be an aspect in which only one protrusion 230 is formed. However, for the same reason as described above, it is desirable that the plurality of protrusions 230 are arranged at equal intervals.

  In the present embodiment, only a part of the screw 100 (a range along the x axis) is surrounded by the slider 200 from the outside. Instead of such an aspect, the entire screw 100 (along the x-axis) may be surrounded by the slider 200 from the outside.

  In the present embodiment, the entire slider 200 (along the x axis) is surrounded from the outside by the door shaft 310. Instead of such a mode, only a part of the slider 200 (a range along the x axis) may be surrounded by the door shaft 310 from the outside.

  In the present embodiment, the three grooves 422 formed on the inner peripheral surface 440 of the small diameter portion 420 are all formed in a uniform spiral shape (see FIG. 4). That is, when the inner peripheral surface 440 is developed and drawn as shown in FIG. 4, each groove 422 is linear and is inclined at a constant angle (θ1) with respect to the central axis CA. .

  Instead of such an aspect, a part of each groove 422 along the x-axis may be formed in a straight line extending along the central axis CA.

  Such a modification will be described with reference to FIG. FIG. 6 shows the entire inner peripheral surface 440 in a modified example in the same manner as in FIG. The upper side and the lower side in FIG. 6 are actually connected.

  As shown in FIG. 6, in this modification, the groove 422 extends along the central axis CA in a partial range along the x axis (between the dotted line DL3 and the dotted line DL4). Of the respective grooves 422, the portion on the −x direction side from the dotted line DL3 and the portion on the x direction side from the dotted line DL4 are constant with respect to the central axis CA, as shown in FIG. Is inclined at an angle of

  In such an aspect, as the slider 200 moves in the x direction, the rotation of the slider 200 around the central axis CA temporarily stops (when the protrusion 220 is between the dotted line DL3 and the dotted line DL4). After that, it starts to rotate again.

  Thereby, it is possible to temporarily stop the rotation of the door member 350 while rotating the rotation shaft MX of the motor M at a constant rotation speed.

  Another modification will be described with reference to FIG. In the example shown in FIG. 7, the groove 422 extends along the central axis CA in a partial range along the x axis (between the dotted line DL5 and the dotted line DL6). Further, in the range on the −x direction side from the dotted line DL5 and the range on the x direction side from the dotted line DL6, the groove 422 is formed to have a spiral shape in the opposite direction.

  In such an aspect, as the slider 200 moves in the x direction, the rotation of the slider 200 temporarily stops (when the protrusion 2230 is between the dotted lines DL5 and DL6), and thereafter Will start rotating in the opposite direction.

  As a result, while rotating the rotating shaft MX of the motor M at a constant rotational speed, the rotation of the door member 350 can be temporarily stopped and thereafter rotated in the reverse direction.

  As described above, the door shaft 310 and the door member 350 can be operated in various operation patterns by appropriately changing the shape of the groove 422.

  In the above description, the example in which the object driven by the drive device 10 is a revolving door has been described. However, the present invention can also be applied to a drive device for driving a slide door.

  FIG. 8 is a diagram schematically showing a part of the drive device 11 according to the second embodiment of the present invention. The driving device 11 is the same as the driving device 10 except that the driving target is the sliding door 700 instead of the rotary door, and the shape of the door shaft is different from the driving device 10. In the following description, the door shaft of the driving device 11 is referred to as “door shaft 310A”.

  The door shaft 310A is configured such that the door member 350 is removed from the rotary door 300 of the driving device 10 (only the door shaft 310 is provided), and gears 361 and 362 are formed on the outer peripheral surface of the door shaft 310. The gear 361 is formed to make one round along the circumferential direction in the vicinity of the end on the −x direction side of the outer peripheral surface of the door shaft 310A. The gear 362 is formed so as to make one round along the circumferential direction in the vicinity of the end on the x-direction side of the outer peripheral surface of the door shaft 310A.

  The slide door 700 to be driven is a rectangular flat plate formed so that its dimension along the x-axis is the same as the length of the door shaft 310A. The slide door 700 is disposed in a state where one main surface 701 is in contact with or close to the outer peripheral surface of the door shaft 310A.

  A gear 761 (rack gear) is formed along the y-axis in the vicinity of the end on the −x direction side of the main surface 701. The gear 761 meshes with a gear 361 formed on the door shaft 310A. Similarly, a gear 762 (rack gear) is formed along the y axis in the vicinity of the end on the x direction side of the main surface 701. The gear 762 meshes with a gear 362 formed on the door shaft 310A.

  When the motor M is driven, the door shaft 310 </ b> A rotates around the central axis CA by the same mechanism as that of the driving device 10. The slide door 700 receives a force from the door shaft 310A at the gears 761 and 762 and moves along the y-axis. That is, the opening / closing operation of the slide door 700 is performed. Thus, the drive target of the drive device according to the present invention is not limited to the revolving door, and various types of doors can be driven.

  The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. In other words, those specific examples that have been appropriately modified by those skilled in the art are also included in the scope of the present invention as long as they have the characteristics of the present invention. For example, the elements included in each of the specific examples described above and their arrangement, materials, conditions, shapes, sizes, and the like are not limited to those illustrated, but can be changed as appropriate. Moreover, each element with which each embodiment mentioned above is provided can be combined as long as technically possible, and the combination of these is also included in the scope of the present invention as long as it includes the features of the present invention.

10, 11: Drive device 100: Screw 200: Slider 310: Door shaft 350: Door member M: Motor MX: Rotating axis CA: Center axis

Claims (12)

A drive device for driving the door member (350),
A motor (M) having a rotation axis (MX);
A first member (100) that is a rod-shaped member that rotates together with the rotating shaft;
A second member (200) arranged to surround at least a portion of the first member from the outside;
A third member (310) disposed so as to surround at least a part of the second member from the outside;
The rotation of the first member around the central axis (CA) of the rotation shaft causes the second member to move in a direction along the central axis, while the rotation speed is lower than the rotation speed of the first member. A first conversion mechanism (110, 210, 220, 422) for rotating the second member around the central axis;
A second conversion mechanism (230, 313) that rotates the third member around the central axis by rotation of the second member around the central axis (CA);
The drive device configured to drive the door member in conjunction with the rotational movement of the third member. The first conversion mechanism includes:
A screw-like protrusion (110) formed on the outer peripheral surface of the first member;
2. The driving device according to claim 1, wherein the driving device has a spiral groove portion (210) formed on an inner peripheral surface of the second member and screwed into the protrusion portion. The first conversion mechanism includes:
A fourth member (420) fixed to the motor casing or formed integrally with the motor casing, the fourth member (420) disposed so as to surround a part of the second member from the outside;
A rotation protrusion (220) protruding outward from the outer peripheral surface of the second member;
A spiral groove formed on the inner peripheral surface (440) of the fourth member, further comprising a rotation groove (422) for receiving the rotation protrusion therein. The drive device according to claim 2. The second conversion mechanism includes:
A driving protrusion (230) protruding outward from the outer peripheral surface of the second member;
A linear groove formed on the inner peripheral surface (340) of the third member so as to extend along the central axis, and a drive groove (313) for receiving the drive protrusion therein. The drive device according to claim 3, wherein the drive device is provided. When viewed along the central axis,
The plurality of driving protrusions are formed so as to protrude in different directions, and the plurality of driving grooves are formed so as to correspond to the respective driving protrusions. The drive device according to claim 4. When viewed along the central axis,
6. The driving apparatus according to claim 5, wherein the plurality of driving protrusions are arranged at equal intervals. When viewed along the central axis,
The plurality of rotation protrusions are formed so as to protrude in different directions, and the plurality of rotation grooves are formed so as to correspond to the respective rotation protrusions. The drive device according to claim 3. When viewed along the central axis,
The drive device according to claim 7, wherein the plurality of rotation protrusions are arranged at equal intervals.   The drive device according to claim 7 or 8, wherein at least a part of the rotation groove is formed in a linear shape extending along the central axis.   2. The driving device according to claim 1, wherein the third member is formed integrally with the door member, and is configured to rotate the door member around the central axis.   The driving apparatus according to claim 1, wherein the motor is a DC motor.   The driving apparatus according to claim 1, wherein the motor is a step motor.

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