JP5166221B2 - Actuator device - Google Patents

Description

  The present invention relates to an actuator device in which a motor is housed in a case, which is suitable for use as an actuator for moving a door of an automotive air conditioner.

Conventionally, an actuator device in which a motor is housed in a case divided into a first case and a second case is known, for example, from Patent Document 1. In this prior art, a motor, a substrate on which a drive circuit for driving the motor is mounted, and a gear mechanism that transmits the rotation of the rotation shaft of the motor to the output shaft while reducing the rotation are accommodated in the case. .
In such an actuator device, when the motor is fixed to the case, the bosses provided around the rotating shaft at two locations separated in the axial direction of the motor housing are separated from the first case and the second case. A support member extending in the direction perpendicular to the axis is configured to sandwich and fix the motor.

In such a motor fixing structure, in order to support the rotation shaft of the motor at a regular position with respect to the gear mechanism, as shown in FIGS. There is known a structure that is elastically fixed by the holding portions (221, 222).
That is, the first case (21) is provided with support portions (211 and 212) having support recesses (211a and 212a) for receiving the boss portions (11 and 12), and the second case (22) is provided with a pair of clamping claws. When sandwiching portions (221, 222) having pieces (221a, 222a) are provided and the boss portions (11, 12) are sandwiched between the support portions (211, 212) and the sandwiching portions (221, 222) The pair of sandwiching claw pieces (221a, 222a) is elastically deformed so that the distance between the pair of clamping claw pieces (221a, 222a) is widened, and using the restoring force, the rotating shaft (10) is disposed at a normal position and the boss portions (11, 12 ) Are in pressure contact with the support recesses (211a, 212a).
Utility Model Registration No. 2551532

However, in the fixing structure that elastically deforms the holding claw pieces as described above, when the actuator device is dropped after assembly of the actuator device, the motor has excessive input in the direction of arrow F in FIG. In addition, the amount of deformation of the holding claw pieces increases.
At this time, if the deformation amount of the clamping claw piece exceeds the elastic limit, the clamping claw piece may be plastically deformed or damaged. When such deformation or breakage occurs, it cannot be seen from the outside of the case. Therefore, if the actuator device is mounted on a device such as an air conditioner as it is, malfunction of the device is caused.

  The present invention has been made paying attention to the above-mentioned conventional problems, and when an excessive load is applied to the motor, an actuator that can prevent deformation or breakage of the clamping claw piece that fixes the motor. The object is to provide an apparatus.

  In order to achieve the above-described object, according to the present invention, a case surrounding a housing space is divided into a first case and a second case, a motor is housed in the housing space, and both axial ends of the motor A cylindrical first boss portion and a second boss portion are formed coaxially with the rotation shaft, and a first support portion for supporting the first boss portion is provided on the first case. A second support part for supporting the second boss part is provided, and the second case is provided with a pair of sandwiching claw pieces for sandwiching the first boss part, and elastically deforms in a direction in which the tip parts of both the clamping claw pieces are separated from each other. And a pair of sandwiching claw pieces that sandwich the second boss portion with the first boss portion being brought into pressure contact with the first support portion, and the tip portions of the both clamping claw pieces are separated from each other. The second boss portion is pressed against the second support portion by a reaction force that elastically deforms in a direction. A restriction that restricts the movement of the motor in the direction of expanding both the holding claw pieces in each holding part within the range of the elastic range of the both holding claw pieces. The actuator device is characterized in that the protrusions are provided integrally.

  According to a second aspect of the present invention, in the actuator device according to the first aspect, the restricting protrusion is located on each pinching portion rather than the axial center position of the first pinching portion and the second pinching portion. The actuator device is characterized by being arranged at a close position.

  According to a third aspect of the present invention, in the actuator device according to the first or second aspect, the restricting protrusion is formed in a ridge shape extending along the second case. It was set as the actuator apparatus characterized by these.

In the actuator device according to the present invention, when the motor receives an input in the direction of deforming the holding claw piece, the movement of the motor relative to the case in the input action direction is restricted by the restriction protrusion, and the holding claw The deformation amount of the piece is restricted within the range of the elastic region.
Therefore, even if there is an excessive input to the motor, the clamping claw pieces are prevented from being deformed beyond the elastic limit, and the plastic claw and damage of the clamping claw pieces are prevented.

  Furthermore, in the invention described in claim 2, when an input in the direction of deforming the clamping claw piece to the motor causes a moment to rotate about the regulating projection as a fulcrum to the motor, this moment is greater than the regulating projection. It becomes easy to act on the axial center position side of both clamping parts, and the displacement amount in both clamping parts by this moment can be suppressed. Therefore, the deformation amount of the clamping claw piece can be suppressed, and the occurrence of plastic deformation and breakage of the clamping claw piece can be further suppressed.

  Further, in the invention according to claim 3, since the restricting protrusion is formed in the shape of a ridge extending for the second case, the strength of the second case is higher than the case where a simple protrusion is used as the restricting protrusion. Increase.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the actuator device according to the embodiment of the present invention, the case (2) surrounding the accommodation space (23) is divided into a first case (21) and a second case (22), and the accommodation space (23 ), The motor (1) is accommodated, and the first boss portion (11) and the second boss portion (12) having a cylindrical shape coaxially with the rotating shaft (10) are provided at both axial ends of the motor (1). The first case (21) formed is provided with a first support part (211) for supporting the first boss part (11) and a second for supporting the second boss part (12). A support portion (212) is provided, and the second case (22) is provided with a pair of sandwiching claw pieces (221a) for sandwiching the first boss portion (11), and the tip portions of both sandwiching claw pieces (221a) are provided. The first boss portion (11) is supported by the first support by a reaction force that is elastically deformed in a separating direction. A first clamping portion (221) that is pressed against (211) and a pair of clamping claw pieces (222a) that sandwich the second boss portion (12), and a direction in which tips of both clamping claw pieces (222a) are separated from each other And a second clamping part (222) that presses the second boss part (12) against the second support part (212) by a reaction force that elastically deforms to the second case (22). The motor (1) moves in the direction of expanding both the clamping claws (221a, 222a) in each clamping part (221, 222) within the elastic range of the both clamping claws (221a, 222a). The actuator device is characterized in that a restricting protrusion (223) for restricting is provided integrally.

Below, based on FIGS. 1-6, the actuator apparatus A of Example 1 of the best embodiment of this invention is demonstrated.
The actuator device A according to the first embodiment is applied, for example, to turn an air mix door of an automotive air conditioner. As shown in FIG. 2, the motor 1 and the motor 1 are accommodated. The case 2 is provided.

  The case 2 is divided into a first case 21 and a second case 22 shown in the figure, and the motor 1 and a speed reducer not shown in the housing space 23 formed between the two cases in a combined state. Contains mechanism and substrate.

As shown in FIGS. 2 and 3, the first case 21 is formed in a substantially concave shape in which the periphery of the lower lid plate 21a is surrounded by the peripheral wall 21b, and includes a first space portion 21c inside the peripheral wall 21b. Yes. FIG. 3 is a plan view showing a state in which the first case 21 shown in FIG. 2 is looked down from above, and the first space portion 21c is omitted from the first motor accommodating portion 21d that accommodates the motor 1. A first reduction mechanism accommodating portion 21e that accommodates a reduction mechanism including a plurality of gears, and a first substrate accommodating portion 21f that accommodates a substrate (not shown) are provided.
As shown in FIGS. 2 and 4, the second case 22 is formed in a substantially concave shape in which the periphery of the upper cover plate 22a is surrounded by the peripheral wall 22b, and includes a second space 22c inside the peripheral wall 22b. Yes. FIG. 4 is a bottom view showing a state in which the second case 22 shown in FIG. 2 is looked up from below, and the second space portion 22c includes a second motor housing portion 22d for housing the motor 1 and an illustration. A second reduction mechanism accommodating portion 22e that accommodates a reduction mechanism having a plurality of omitted gears, and a second substrate accommodating portion 22f that accommodates a substrate that is not shown. The second substrate housing portion 22f is provided with an output shaft hole 22g that penetrates the output shaft (not shown) through the upper lid plate 22a and protrudes from the case 2.

  The first case 21 and the second case 22 described above are joined to form an accommodation space 23 in which the first space 21c and the second space 22c are combined.

Next, a coupling structure between the first case 21 and the second case 22 will be briefly described.
In the second case 22, a plurality of coupling pieces 22h are suspended downward in FIG. These coupling pieces 22h are provided with elongated and substantially rectangular engagement holes 22j along the extending direction of the coupling pieces 22h.

  On the other hand, on the outer surface of the peripheral wall 21b of the first case 21, engaging projections 21j protruding outward are formed corresponding to the respective engaging holes 22j so as to be engageable with the engaging holes 22j.

  Therefore, in FIG. 2, when the second case 22 is moved downward, the coupling piece 22h moves over the engagement protrusion 21j while elastically deforming outward of the peripheral wall 21b, and the engagement hole is located at the position of the engagement protrusion 21j. When 22j reaches, the coupling piece 22h is restored to the original hanging state, and the engagement hole 22j and the engagement projection 21j are engaged, and the cases 21 and 22 are coupled.

Next, a structure for fixing the motor 1 when the motor 1 is housed will be described.
As shown in FIG. 3, in the first case 21, the first support piece 211 and the second support piece 212 are erected at a position on the axis m of the rotation shaft 10 of the motor 1 in the first motor housing portion 21 d. ing.
On the other hand, in the second case 22, as shown in FIG. 4, in the second motor housing portion 22 d, a pair of the first clamping portion 221 and the second clamping portion 222 are located on the axis m of the rotating shaft 10 of the motor 1. And are provided.

This will be described with reference to FIG. 1, which shows the structure in a simplified manner. At both axial ends of the motor 1, cylindrical first boss portions 11 and second bosses that accommodate bearings for supporting the rotating shaft 10 therein. A portion 12 is provided. A worm gear 13 is provided at the tip of the rotating shaft 10.
Both the support pieces 211 and 212 are erected at positions that overlap the boss portions 11 and 12 in the direction perpendicular to the axis so that the boss portions 11 and 12 of the motor 1 can be supported.
In addition, arc-shaped support recesses 211a and 212a are formed at the tip portions of the support pieces 211 and 212 so that the bosses 11 and 12 can be supported. In addition, the circular arc which forms the support recessed parts 211a and 212a is formed larger diameter than the circular arc of each boss | hub part 11 and 12, as shown in FIG.

  Returning to FIG. 1, both the sandwiching portions 221 and 222 each include a pair of sandwiching claw pieces 221 a, 221 a, 222 a, and 222 a that are separated in the direction perpendicular to the axis. And as shown in FIG. 5, as for each clamping claw piece 221a, 222a, the space | interval h1 of the axis orthogonal direction is set to the dimension smaller than the diameter h2 of both the boss | hub parts 11 and 12. FIG. In addition, the sandwiching claw pieces 221a and 222a are formed with inclined surfaces 221b and 222b that contact the boss portions 11 and 12 at their tips, and the inclined surfaces 221b and 222b contact the boss portions 11 and 12, respectively. When it is done, each clamping claw piece 221a, 222a is inclined in a direction leading to the outer diameter direction of the boss portions 11, 12.

The motor 1 is formed to have an outer dimension smaller than the distance between the lower lid plate 21a and the upper lid plate 22a of the cases 21 and 22, and the motor 1 is disposed away from the lid plates 21a and 22a. These are disposed away from the peripheral walls 21b and 22b.
Therefore, substantially triangular regulating ribs 21k and 22k that restrict the motor 1 from displacing in the direction perpendicular to the axis at predetermined positions are formed in the motor housing portions 21d and 22d of the cases 21 and 22, respectively.
That is, as shown in FIGS. 1 and 3, the first case 21 is formed with three regulating ribs 21k integrally with the peripheral wall 21b in the first motor accommodating portion 21d.
As shown in FIGS. 1 and 4, three restriction ribs 22k are formed on the second case 22 on both sides of the second motor housing portion 22d in the direction perpendicular to the axis.

  Further, as shown in FIGS. 1 and 4 to 6, the upper cover plate 22 a of the second case 22 is positioned so as to overlap the axis m of the rotating shaft 10 of the motor 1, A pair of cylindrical restricting bosses 223 and 223 as projecting protrusions project from a center position in the axial direction and a position closer to each sandwiching part 221 and 222 than a center position between both sandwiching parts 221 and 222. .

  The protruding margin of the restricting boss 223 is that when the motor 1 moves in a direction approaching the upper lid plate 22a, which is the upper side of FIGS. 5 and 6, the clamping claw pieces 221a and 222a are deformed beyond the elastic limit. The amount is set to regulate.

  Accordingly, when the actuator device A is dropped together with the case 2 and a gravitational acceleration is applied to the motor 1, when a load is applied to the motor 1 in the direction of arrow F in FIGS. The movement of the motor 1 in the direction of arrow F is restricted when it contacts the restriction boss 223.

  Thus, when the motor 1 moves, each pair of clamping claw pieces 221a, 221a, 222a, 222a is elastically deformed in the direction of widening the distance between them as indicated by the arrow H. The clamping claw pieces 221a and 222a are prevented from being plastically deformed beyond the elastic limit or damaged.

Further, as shown in FIG. 4, the restriction bosses 223, 223 are respectively positioned on the axis m more than the axial center positions of the both sandwiching portions 221, 222 and the center positions of the sandwiching portions 221, 222. These are arranged at positions close to the sandwiching portions 221 and 222.
Therefore, if a moment about the restriction boss 223 is generated in the motor 1 when a load in the direction of the arrow F is applied to the motor 1, the moment is expressed by the motor 1 as indicated by the arrow Mo. It becomes easy to face to the center position side, and it becomes difficult to act on each clamping part 221,222. Therefore, the displacement amount of each boss part 11, 12 due to the moment with one of the amount clamping parts 221, 222 as the fulcrum in the motor 1 can be kept small, and reliable movement restriction is achieved with a small protrusion amount of the restriction boss 223. It can be performed.

  In addition, as described above, the restriction boss 223 can restrict the movement of the motor 1 in the direction approaching the upper lid plate 22 a, so that the upper lid plate 22 a can be arranged away from the motor 1. Thereby, in each clamping part 221, 222, the length of each clamping claw piece 221a, 222a can be secured, and the elastic coefficient of each clamping claw piece 221a, 222a is made lower than when these lengths are short, The alignment function of the rotating shaft 10 of the motor 1 can be ensured.

  In addition, in the first embodiment, since the restriction boss 223 is formed integrally with the upper lid plate 22a, the number of components is reduced and the manufacturing cost is reduced as compared with the case where the upper lid plate 22a and a separate component are used. be able to.

(Other examples)
Hereinafter, other examples of the embodiment of the present invention will be described.
In the description of these other embodiments, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof is omitted. Also, with regard to the action, the description of the action common to the first embodiment is omitted.

Next, the actuator device according to the second embodiment will be described with reference to FIG.
In the second embodiment, the reinforcing rib 200 is formed on the upper cover plate 22a of the second case 22 so as to be integrated with the regulating rib 22k over substantially the entire width of the second motor housing portion 22d. When the motor 1 moves in a direction approaching the upper lid plate 22a, the amount is set to an amount that restricts the deformation of the respective clamping claw pieces 221a and 222a beyond the elastic limit.

  In the second embodiment, in addition to the same effects as those of the first embodiment, the upper lid plate 22a can be reinforced by using a configuration that restricts the movement of the motor 1.

Next, an actuator device according to Example 3 will be described with reference to FIG.
In the third embodiment, a thin plate-like regulating rib 300 is provided as a regulating projection so as to overlap with the axis m (see FIG. 3) over substantially the entire length between the both sandwiching portions 221 and 222. Similarly to the first and second embodiments, when the motor 1 moves in a direction approaching the upper cover plate 22a, the clamping claw pieces 221a and 222a are deformed beyond the elastic limit, as in the first and second embodiments. It is set to the amount that regulates.
In the third embodiment, in addition to obtaining the same effect as in the first embodiment, when a load in the direction of arrow F acts on the motor 1, it is possible to prevent the rolling with the regulating rib 300 as a fulcrum. Deformation exceeding the elastic limit of each clamping claw piece 221a, 222a can be prevented more reliably.

  As described above, the embodiment and Examples 1 to 3 of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment and Examples 1 to 3, and the present invention is not limited thereto. Design changes that do not depart from the gist are included in the present invention.

  For example, in the first embodiment, the columnar restriction boss 223 is shown as the restriction protrusion. However, the cross-sectional shape of such a protrusion is not limited to the circular shape shown in the first embodiment, and may be a triangle or a square. You may form in the polygon. Moreover, it is not limited to columnar shape, You may form in cylindrical shapes, such as a cylinder.

  Moreover, in Examples 1-3, although the plate-shaped support pieces 211 and 212 were shown as a support part, the shape is not limited to such a plate-like thing, It is a shape which can support a boss | hub part. If so, a support portion in which a solid or hollow step portion is provided on the lower lid plate 21a and a curved shape capable of supporting the boss portion is formed on the step portion may be used.

  Further, in the second and third embodiments, the reinforcing rib 200 extending in the direction orthogonal to the axis m and the regulating rib 300 in the direction along the axis m are shown as the regulating protrusions. You may use the rib formed in this, and the rib formed in the well shape.

It is a disassembled perspective view which shows the principal part of the actuator apparatus A of Example 1 of the best mode for carrying out the present invention. FIG. 3 is a side view showing the actuator device A of Example 1 in a state where a first case 21 and a second case 22 are separated. 3 is a plan view showing a first case 21 used in the actuator device A of Embodiment 1. FIG. 6 is a bottom view showing a second case 22 used in the actuator device A of Example 1. FIG. It is a side view which shows the principal part of the actuator apparatus A of Example 1, Comprising: The state seen from the left direction of FIG. 1 is shown. FIG. 3 is a front view illustrating a main part of the actuator device A according to the first embodiment. FIG. 6 is an exploded perspective view showing a main part of an actuator device according to a second embodiment. FIG. 10 is an exploded perspective view showing a main part of an actuator device according to a third embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor 2 Case 10 Rotating shaft 11 1st boss | hub part 12 2nd boss | hub part 21 1st case 21d 1st motor accommodating part 22 2nd case 22d 2nd motor accommodating part 23 Accommodating space part 211 1st support piece (1st support) Part)
211a support recess 212 second support piece (second support part)
212a support recess 221 first clamping part 221a clamping claw piece 222 second clamping part 222a clamping claw piece 223 regulation boss (regulation projection)
200 Reinforcement rib (regulation protrusion)
300 Restriction rib (regulation protrusion)
A Actuator device

Claims (3)

A box-shaped case surrounding the accommodation space is divided into a first case and a second case,
A motor is housed in the housing space,
A cylindrical first boss portion and a second boss portion are formed coaxially with the rotating shaft at both axial ends of the motor,
The first case is provided with a first support part for supporting the first boss part, and a second support part for supporting the second boss part,
The second case is provided with a pair of clamping claw pieces that sandwich the first boss portion, and the first boss portion is supported by the first force by a reaction force that elastically deforms in a direction in which the tip portions of the both clamping claw pieces are separated from each other. And a pair of sandwiching claw pieces for sandwiching the second boss portion, and the second boss portion is moved by a reaction force that elastically deforms in a direction in which the distal end portions of the both clamping claw pieces are separated from each other. A second clamping part that is brought into pressure contact with the second support part,
The second case is integrally provided with a regulation protrusion that regulates the movement of the motor in each clamping part in the direction in which both clamping claw pieces are expanded within the elastic range of both clamping claw pieces. An actuator device characterized by that.   The restricting protrusion is arranged at a position closer to each clamping part than a center position in the axial direction between the first clamping part and the second clamping part and a central position between the clamping parts. The actuator device according to claim 1.   The actuator device according to claim 1, wherein the restricting protrusion is formed in a ridge shape extending along the second case.

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