JP2008199799A - Electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor which can raise the cooling effect of electric circuit parts in simple structure. <P>SOLUTION: This motor 1 is equipped with the motor body 2 which generates a torque, a speed-reducing part 3 assembled on the motor body 2, and a control circuit member. The speed-reducing part 3 is equipped with a worm storage 23b, which stores a worm shaft 25 for reducing the rotation of the motor body 2, and a case 21 which has a circuit storage 23d that stores the control circuit member. A case 21 has a ventilation part 29, which connects the worm storage 23b with the circuit storage 23d and also connects the worm storage 23b and the circuit storage 23d to the outside of the case 21. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a motor provided with an electric circuit component.

2. Description of the Related Art Conventionally, there are motors used in power window devices and the like in which a motor main body that generates a rotational force and a speed reducing portion that decelerates the rotation of the motor main body are integrally assembled. For example, in the motor described in Patent Document 1, a control circuit member having an electric circuit component such as an IC is accommodated in the case of the speed reduction unit. The case includes a gear housing and a cover fixed to the gear housing. In addition, the control circuit member includes a heat sink for cooling the electric circuit components. When the electric circuit component generates heat, the heat sink absorbs and dissipates the heat to cool the electric circuit component.
JP 2006-50884 A

  However, since the heat sink is accommodated in the case, the heat radiated from the heat sink is likely to be struck in the case. Therefore, there is a possibility that the cooling effect of the electric circuit component by the heat sink cannot be obtained sufficiently. Therefore, it is conceivable to provide a breathing hole at a position corresponding to the control circuit member in the case to discharge the hot air in the case to the outside of the case. Otherwise, there is a possibility that hot air cannot be exhausted sufficiently.

  Although it is conceivable to expose the heat sink to the outside of the case and directly apply it to the outside air, it is necessary to newly provide a waterproof structure between the heat sink and the case. As a result, there arises a problem that the structure of the motor is complicated.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a motor that can enhance the cooling effect of electric circuit components with a simple structure.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a motor main body that generates a rotational force, a speed reduction mechanism for reducing the rotation of the motor main body, and a speed reduction mechanism accommodating portion that accommodates the speed reduction mechanism. A motor including a speed reduction portion having a case including a circuit housing portion and a control circuit member having an electric circuit component disposed in the circuit housing portion, wherein the case includes the speed reduction mechanism housing portion and the circuit. The gist of the invention is to have an air passage that communicates with the accommodating portion and communicates the speed reduction mechanism accommodating portion and the circuit accommodating portion with the outside of the case.

  According to this configuration, when the motor main body is driven and the speed reduction mechanism is operated, the air in the speed reduction mechanism housing portion flows along with the operation of the speed reduction mechanism. And since the deceleration mechanism accommodating part and the circuit accommodating part are connected by the ventilation path, the air in a circuit accommodating part is also flowed through a ventilation path with operation | movement of a deceleration mechanism. Further, the speed reduction mechanism accommodating portion and the circuit accommodating portion are communicated with the outside of the case through the same air passage. For this reason, when the speed reduction mechanism is operated, air flows easily between the speed reduction mechanism housing and the circuit housing and the outside of the case, and the hot air in the circuit housing is easily discharged from the air passage to the outside of the case. Become. Therefore, heat is suppressed from being generated in the circuit housing portion. Further, it is possible to take in air outside the case from the air passage and directly apply it to the control circuit member. As a result, the cooling effect of the electric circuit components provided in the control circuit member can be enhanced with a simple configuration in which only the ventilation path is provided.

  According to a second aspect of the present invention, in the motor according to the first aspect, the case includes an inner wall that separates the speed reduction mechanism housing portion and the circuit housing portion inside the case, and the air passage includes the inner wall. The gist of the present invention is to have a communication hole that penetrates through and communicates the speed reduction mechanism housing portion and the circuit housing portion.

  According to this configuration, the case includes an inner wall that separates the speed reduction mechanism housing portion and the circuit housing portion from the inside, so that the strength of the case against a load applied from the speed reduction mechanism when the speed reduction mechanism is operated is improved by the inner wall. Is done. Further, since the communication hole is provided in the inner wall, the speed reduction mechanism accommodating portion and the circuit accommodating portion are communicated with each other through the communication hole, and ventilation is performed between the speed reduction mechanism accommodating portion and the circuit accommodating portion.

  The gist of the invention described in claim 3 is that the ventilation path has a shape in which the outer wall and the inner wall of the case are cut out from the outside of the case along the standing direction of the inner wall.

  According to this configuration, the air passage has a simple shape such as a shape in which the outer wall and the inner wall of the case are cut out from the outside of the case along the standing direction of the inner wall. And, for example, when the part where the air passage is formed in the case is made of a synthetic resin material, if the mold for forming the part is provided with one pin, the case can be obtained by using the mold. A portion having an air passage having a communication hole can be formed. Therefore, an air passage having a communication hole can be formed without using a complicated mold such as a slide mold. As a result, the cost for the mold can be reduced.

  The invention described in claim 4 is the motor according to claim 2 or 3, wherein the communication hole is formed in a portion of the inner wall facing the control circuit member. It is said.

  According to this configuration, the air flowing into the circuit housing portion from the communication hole can easily hit the control circuit member. Therefore, the cooling effect of the electric circuit components provided in the control circuit member can be further enhanced.

  A fifth aspect of the present invention is the motor according to the fourth aspect, wherein the communication hole is formed in a portion of the inner wall facing the central portion of the control circuit member.

  According to this configuration, the air flowing into the circuit housing portion from the communication hole flows from the central portion on the inner wall side of the control circuit member to the periphery of the control circuit member. Therefore, uneven cooling of the electric circuit components provided in the control circuit member can be suppressed.

  According to a sixth aspect of the present invention, in the motor according to the second or third aspect, the speed reduction mechanism includes a worm shaft having a worm portion and rotated by the motor body, and the communication hole. The gist is that the inner wall is formed in a portion facing the worm portion.

  According to this configuration, when the worm shaft is rotated by the motor body, air is likely to flow around the worm portion. Therefore, if the communication hole is formed in the portion of the inner wall facing the worm portion, the air in the circuit housing portion also easily flows. As a result, the cooling effect of the electric circuit components provided in the control circuit member can be further enhanced.

  A seventh aspect of the present invention is the motor according to the second or third aspect, wherein the speed reduction mechanism includes a worm shaft having a worm portion and rotated by the motor body, and the communication hole. The gist thereof is that the inner wall is formed at a position avoiding the portion facing the worm portion.

  According to this configuration, even when the lubricant applied to the worm portion is scattered along with the rotation of the worm shaft, the inner wall is interposed between the control circuit member and the worm portion of the worm shaft. Therefore, adhesion of the lubricant to the control circuit member can be suppressed.

  According to an eighth aspect of the present invention, in the motor according to any one of the first to seventh aspects, the opening of the air passage provided on the outer wall of the case does not have water permeability. The gist is that a waterproof sheet having gas permeability is provided.

  According to this configuration, since the waterproof sheet does not have water permeability, water can be prevented from entering the case through the air passage. On the other hand, since the waterproof sheet has gas permeability, the flow of air between the inside and outside of the case performed through the air passage is not hindered.

  ADVANTAGE OF THE INVENTION According to this invention, the motor which can raise the cooling effect of an electric circuit component with a simple structure can be provided.

Hereinafter, an embodiment in which the present invention is embodied in a motor for a power window device mounted on a vehicle will be described with reference to the drawings.
As shown in FIG. 1A, a motor 1 includes a motor main body 2 that generates a rotational force, a speed reduction unit 3 that decelerates and outputs the rotation of the motor main body 2, and a control circuit member 4 (see FIG. 2). It is composed of.

  A yoke housing (hereinafter referred to as a yoke) 5 constituting the motor body 2 has a bottomed cylindrical shape. As shown in FIG. 2, a pair of permanent magnets 6 is fixed to the inner surface of the yoke 5, and an armature 7 that is rotatably supported in the yoke 5 is accommodated inside the permanent magnet 6. Has been. In addition, a flange 5a extending outward from the periphery of the yoke 5 is provided at the opening of the yoke 5, and a brush holder 8 made of a synthetic resin material is fixed.

  The brush holder 8 includes a holder body 8a, a flange portion 8b, an extension portion 8c, a connector portion 8d, and a terminal support portion 8e. The holder main body 8 a that is substantially accommodated in the opening of the yoke 5 has a shape corresponding to the opening of the yoke 5. And the bearing 9 is fixed to the center part of the holder main body 8a, and this bearing 9 is supporting the front end side (lower end part in FIG. 2) of the rotating shaft 10 of the said armature 7. . The tip of the rotary shaft 10 penetrates the bearing 9 and protrudes to the outside of the yoke 5, and a disc-shaped metal fixing plate 12 is provided at the tip of the rotary shaft 10 protruding from the yoke 5. An annular sensor magnet 11 is fixed through the gap. In addition, a pair of power supply brushes 13 arranged so as to have a predetermined angle with each other are held at a portion of the holder main body 8 a on the inner side of the yoke 5, and these power supply brushes 13 are attached to the rotary shaft 10. The outer peripheral surface of the fixed cylindrical commutator 14 is in press contact with each other.

  The flange portion 8b extending outward is formed on the periphery of the end portion of the holder body 8a opposite to the yoke 5. The extension portion 8c is formed at a predetermined portion of the flange portion 8b so as to extend from the flange portion 8b in one direction (rightward in FIG. 2), and at the distal end portion of the extension portion 8c. The connector portion 8d is integrally formed. The connector portion 8d is formed so that an external connector (not shown) can be fitted from one direction along the radial direction of the rotating shaft 10 (the vertical direction in FIG. 2). The extension portion 8c is integrally formed with the terminal support portion 8e extending from the extension portion 8c along the axial direction of the rotary shaft 10 to the opposite side of the yoke 5.

  The brush holder 8 has a plurality of brush-side terminals 15 and a plurality of connector-side terminals 16 embedded therein (insert molding). Each brush-side terminal 15 extends from the inner side of the yoke 5 in the holder body 8a to the extension portion 8c, and the internal connection terminal 15a that is the tip of the brush-side terminal 15 extends along the axial direction of the motor body 2 from the terminal support portion 8e. Projecting (exposed) in the direction (downward in FIG. 2). The power supply brush 13 is electrically connected to the base end portion of the brush side terminal 15 through a pigtail. Each connector-side terminal 16 extends from the connector portion 8d to the extension portion 8c, and the internal connection terminal 16a, which is the tip portion, extends in one direction from the terminal support portion 8e along the axial direction of the motor body 2 (FIG. 2). Projecting downward (exposed). The base end portion of the connector side terminal 16 is exposed at the connector portion 8d to form an external connection terminal 16b, and is electrically connected to the terminal of the external connector by fitting the external connector to the connector portion 8d. Is done. The internal connection terminals 15a and 16a are arranged side by side along one direction along the radial direction of the rotating shaft 10 (perpendicular to the paper surface in FIG. 2). In FIG. 2, only one internal connection terminal 15 a, 16 a is illustrated because it is arranged in parallel in the direction perpendicular to the paper surface. Further, in the brush holder 8, the flange portion 8b, the extending portion 8c, and the connector portion 8d are substantially covered with a waterproof member 17 made of an elastomer, except for portions corresponding to the external connection terminals 16b of the connector portion 8d. Yes.

  As shown in FIG. 1A, the speed reduction unit 3 includes a case 21 and a speed reduction mechanism 22 accommodated in the case 21. The case 21 also accommodates the control circuit member 4 (see FIG. 2). The case 21 includes a gear housing 23 and a cover 24 fixed to the gear housing 23. The gear housing 23 is made of a synthetic resin material, and includes a fixed portion 23a, a worm accommodating portion 23b, a wheel accommodating portion 23c, and a circuit accommodating portion 23d. In the present embodiment, the speed reduction mechanism accommodating portion is configured by the worm accommodating portion 23b and the wheel accommodating portion 23c.

  The fixing portion 23a has a shape corresponding to the flange portion 5a of the yoke 5, and is fixed to the flange portion 5b together with the flange portion 5a by the screw S so that the flange portion 8b of the brush holder 8 is waterproofed. (Via member 17) (see FIG. 2).

  As shown in FIGS. 1A and 2, the worm accommodating portion 23 b formed integrally with the fixed portion 23 a is formed to extend in a cylindrical shape on the extension line of the rotating shaft 10, and is formed therein. The worm shaft 25 constituting the speed reduction mechanism 22 is accommodated. The worm shaft 25 has a worm portion 25a formed with screw teeth at a substantially central portion in the axial direction thereof, and is rotatably supported inside the worm housing portion 23b. Further, a clutch 26 for drivingly connecting the worm shaft 25 and the rotary shaft 10 is provided in a portion of the worm housing portion 23b on the motor body 2 side. The clutch 26 operates to lock the rotation of the worm shaft 25 so that the driving force from the rotating shaft 10 is transmitted to the worm shaft 25 while the driving force from the worm shaft 25 is not transmitted to the rotating shaft 10. That is, the clutch 26 is provided to prevent the motor 1 from rotating due to the force applied from the load side. Further, in the gear housing 23, a magnet housing portion that houses the sensor magnet 11 and a portion to which the sensor magnet 11 is fixed on the rotating shaft 10 between the clutch 26 and the holder body 8 a of the brush holder 8. 27 is formed.

  The wheel accommodating portion 23c formed integrally with the fixed portion 23a and the worm accommodating portion 23b has a disk shape whose radial direction is orthogonal to the longitudinal direction of the worm accommodating portion 23b, and the speed reducing mechanism together with the worm shaft 25 therein. The worm wheel 28 which comprises 22 is accommodated. The worm wheel 28 has a disk shape and is supported so as to be rotatable in the circumferential direction inside the wheel housing portion 23c. Further, the inner space of the wheel housing portion 23c is connected to the inner space of the worm housing portion 23b at a substantially central portion in the longitudinal direction of the worm housing portion 23b, and the worm wheel 28 is connected to the inner space of the wheel housing portion 23c. The worm portion 25a of the worm shaft 25 is meshed with a portion where the internal space of the accommodating portion 23b is connected.

  As shown in FIG. 2, the circuit housing portion 23 d is formed integrally with the worm housing portion 23 b at a position corresponding to the internal connection terminals 15 a and 16 a in the gear housing 23. More specifically, the circuit housing portion 23d is formed at a position opposite to the wheel housing portion 23c with respect to the worm housing portion 23b and at a position between the worm housing portion 23b and the connector portion 8d. The internal connection terminals 15a and 16a are formed inside. The circuit housing portion 23d has a substantially cylindrical shape extending along the axial direction of the rotating shaft 10, and the control circuit member is disposed inside the circuit housing portion 23d at the end opposite to the motor body 2. An opening 23 f is formed so that the control circuit member 4 can be inserted from the direction along the axial direction so as to accommodate 4. The opening 23 f is inclined with respect to the axial direction and the radial direction of the rotary shaft 10 in the opening direction (a direction orthogonal to the opening 23 f). In the present embodiment, the opening 23f is formed between the connector portion 8d and the worm accommodating portion 23b when viewed from the axial direction (the direction perpendicular to the paper in FIG. 2) of the worm wheel 28 accommodated in the wheel accommodating portion 23c (see FIG. 1). It is formed in a straight line connecting the front end (the end opposite to the motor body 2). The inside of the circuit housing portion 23d communicates with the magnet housing portion 27, and the internal connection terminals 15a and 16a in the circuit housing portion 23d are exposed when viewed from the outside in the opening direction of the opening portion 23f ( Is visible).

  The circuit housing portion 23d and the worm housing portion 23b are separated by an inner wall 23g. The inner wall 23g connects the outer walls 23m and 23n (see FIGS. 1 and 3) of the gear housing 23 disposed on both sides in the axial direction of the worm wheel 28 and along the axial direction of the rotary shaft 10. It is formed to extend. In the present embodiment, the standing direction of the inner wall 23g coincides with the axial direction of the worm wheel 28.

  Further, as shown in FIGS. 1A and 1B, the gear housing 23 has an opening 29a in the outer wall 23m at a position corresponding to the inner wall 23g and extends in the axial direction of the worm wheel 28. A ventilation path 29 is formed. The air passage 29 has a shape in which the outer wall 23m and the inner wall 23g of the gear housing 23 are cut out from the outside of the gear housing 23 along the standing direction of the inner wall 23g, and penetrates the outer wall 23m to form the inner wall 23g. (See FIG. 3). In the air passage 29, the portion that penetrates the outer wall 23m is a portion that is formed in the inner wall 23g while the shape of the worm wheel 28 viewed from the axial direction is a circular shape having a diameter larger than the thickness of the inner wall 23g. Has a quadrangular shape in which the shape of the worm wheel 28 viewed from the axial direction is within a circular portion that penetrates the outer wall 23m of the air passage 29. Further, when the air passage 29 is viewed from the axial direction of the worm wheel 28, the portion formed in the inner wall 23g has a width in one direction along the radial direction of the worm shaft 25 (the horizontal direction in FIG. 2) is the thickness of the inner wall 23g. (The width in the left-right direction in FIG. 2). Then, when the air passage 29 passes through the outer wall 23m and reaches the inner wall 23g, as shown in FIG. 2, the inner wall 23g penetrates the inner wall 23g and the internal space of the circuit housing portion 23d and the worm housing portion 23b. A communication hole 29b communicating with the internal space is formed. As shown in FIG. 3, the communication hole 29b has a constant width (in the horizontal direction in FIG. 3) perpendicular to the thickness direction of the inner wall 23g and the standing direction of the inner wall 23g (along the standing direction of the inner wall 23g). It is constant at any position. The communication hole 29b constitutes a part of the air passage 29. As shown in FIG. 2, the air passage 29 communicates the internal space of the circuit housing portion 23 d and the internal space of the worm housing portion 23 b, and the circuit housing portion 23 d, the worm housing portion 23 b, and the outside of the case 21. And communicated with each other. Note that the air passage 29 of this embodiment also serves as a breathing hole for eliminating the pressure difference between the inside and outside of the motor 1.

  As shown in FIG. 3, a waterproof sheet 30 is provided in the opening 29 a of the air passage 29. This waterproof sheet 30 does not have water permeability but has gas permeability. The waterproof sheet 30 is welded to the waterproof rubber 30a having an annular shape corresponding to the opening 29a of the air passage 29, and the waterproof rubber 30a is fitted into the opening 29a to open the waterproof sheet 30. Arranged in the portion 29a. In addition, illustration of the waterproof sheet 30 is abbreviate | omitted in Fig.1 (a) and FIG.1 (b).

  And as shown in FIG. 2, the said control circuit member 4 is substantially accommodated in the said circuit accommodating part 23d. The control circuit member 4 includes a holding member 31 and a plurality of electric circuit components (mold IC 32, a plurality of capacitors 33, a choke coil 34, a Hall IC 35, and an LIN communication oscillator 36 assembled to the holding member 31. Etc.) and a heat sink 37.

  The holding member 31 includes a base member 41 made of a resin material and a plurality of terminals 42 disposed (insert molding) on the base member 41. The base body 41a constituting the base member 41 has a flat plate shape, and both end surfaces in the thickness direction (left and right direction in FIG. 2) are planar fixing surfaces 41b and 41c on which electric circuit components are respectively disposed. It has become. Terminal connection bases 41d and 41e are respectively formed integrally with the base body 41a at both ends of the base body 41a (both ends along the axial direction of the rotary shaft 10). One terminal connection base 41d has a three-step staircase shape, and the other terminal connection base 41e has a one-step staircase shape. The terminal connection bases 41d and 41e project in a step shape so as to protrude in one direction perpendicular to the fixed surface 41b (the side facing the fixed surface 41c from the fixed surface 41b in FIG. 2). Further, an oscillator protection wall 41f is provided upright at the tip of the terminal connection base 41e.

  Each terminal connection base 41d, 41e is provided with an IC connection portion 42a in which a part of the terminal 42 is exposed from the resin material constituting the terminal connection base 41d, 41e. Further, a sensor connection part 42b in which a part of the terminal 42 is exposed from a resin material constituting the terminal connection base 41d is provided at the tip of the terminal connection base 41d. Further, an external portion is formed such that a part of the terminal 42 protrudes from the fixed surface 41c at a position corresponding to the brush-side terminal 15 and the internal connection terminals 15a and 16a of the connector-side terminal 16 on the fixed surface 41c. A plurality of connection portions 42c (only one is shown in FIG. 2) are provided.

  A substantially rectangular parallelepiped mold IC 32 is fixed to the fixing surface 41b of the base body 41a. The mold IC 32 has a base portion (package) 32a on which a semiconductor element is mounted (embedded), and a direction along the plane of the base portion 32a (the longitudinal direction of the base portion 32a, and the vertical direction in FIG. 2). A plurality of lead terminals 32b electrically connected to the semiconductor element are drawn out from both ends of the semiconductor device. The lead terminals 32b are electrically connected to the IC connection part 42a by welding. In addition, the mold IC 32 of the present embodiment is provided with a plurality of inspection lead terminals 32c. Note that the motor 1 of this embodiment does not include a relay as a drive circuit, and a semiconductor element mounted on the mold IC 32 includes a power MOSFET as a drive circuit.

  The mold IC 32 is electrically connected to the Hall IC 35 fixed to the tip of the terminal connection base 41d through the sensor connection part 42b of the terminal 42 embedded in the terminal connection base 41d. When the mold IC 32 determines that pinching has occurred in the window glass of the vehicle according to the rotational speed of the sensor magnet 11 (rotary shaft 10) detected by the Hall IC 35, the power supply brush 13 (motor body 2 ) Is controlled to supply reverse rotation current. The Hall IC 35 is disposed on the same side of the base member 41 as the surface on which the mold IC 32 is fixed.

  The heat sink 37 is fixed to a surface of the mold IC 32 opposite to the fixed surface 41b. The heat sink 37 is made of an aluminum alloy and has a rectangular plate shape slightly smaller than the mold IC 32. The heat sink 37 has one end surface in the thickness direction of the heat sink 37 opposite to the fixed surface 41b of the mold IC 32 in order to dissipate (heat radiate) the heat generated in the mold IC 32 (particularly, the semiconductor element constituting the mold IC 32). It is fixed to the mold IC 32 while being in contact with the side surface.

  On the other hand, a plurality of capacitors 33 and choke coils 34 are disposed on the fixed surface 41c of the base body 41a, and terminals of these electric circuit components are electrically connected to terminals 42 embedded in the base body 41a by soldering. Connection is fixed.

  The terminal connection base 41e is provided with an oscillator 36 for LIN communication. The oscillator 36 is disposed on the same surface as the surface of the base member 41 to which the capacitor 33, the choke coil 34, and the like are fixed. The terminal of the oscillator 36 is connected and fixed by solder to a terminal 42 (shared with the IC connection portion 42a in the present embodiment) embedded in the terminal connection base 41e. Note that the oscillator 36 of the present embodiment is disposed on the base end side of the terminal connection base 41e with respect to the oscillator protection wall 41f, and the oscillator protection wall 41f is disposed outside or disposed outside. Contact to each part is prevented.

  The control circuit member 4 configured as described above is inserted and assembled into the circuit housing portion 23d from the opening 23f in a state where the speed reduction portion 3 is assembled to the motor body 2. The control circuit member 4 is inserted into the circuit housing portion 23d from the direction along the axial direction of the rotary shaft 10. In a state where the control circuit member 4 is assembled to the gear housing 23, a part of the control circuit member 4 protrudes from the opening 23 f to the outside of the gear housing 23. In addition, when the control circuit member 4 is assembled and substantially accommodated in the gear housing 23, the plurality of external connection portions 42c are electrically connected to the internal connection terminals 15a and 16a of the brush side terminal 15 and the connector side terminal 16, respectively. It is arranged to be connectable. In a state where the control circuit member 4 is substantially accommodated in the circuit accommodating portion 23d, the Hall IC 35 faces the sensor magnet 11 in the radial direction, and the communication hole 29b is provided with the rotation shaft 10 of the control circuit member 4. This is opposed to a portion that is slightly closer to the motor body 2 side than the central portion in the axial direction (opposite the thickness direction of the inner wall 23g, that is, the left-right direction in FIG. 2). The plurality of external connection portions 42c exposed when viewed from the outside in the opening direction of the opening portion 23f are welded and electrically connected to the internal connection terminals 15a and 16a, respectively.

  The cover 24 is fixed to the opening 23f of the circuit housing portion 23d. The cover 24 is made of a metal material and has a concave shape corresponding to a portion protruding from the opening 23f of the control circuit member 4 to the outside of the circuit housing portion 23d. The cover 24 is arranged so as to cover the opening 23 f of the control circuit member 4, and the cover 24 is fixed to the gear housing 23 by caulking the opening of the cover 24 against the gear housing 23. Yes. Note that a space for accommodating the control circuit member 4 in the case 21 is an internal space of the circuit accommodating portion 23 d and the cover 24.

  The motor 1 configured as described above is disposed in the door of the vehicle, and the output shaft 28a connected to the worm wheel 28 is drivingly connected to the window glass of the vehicle via a regulator (not shown) or the like. .

  When a current is supplied to the armature 7 from a power supply device (not shown) such as a battery of the vehicle via the brush side terminal 15 and the power supply brush 13, the armature 7 rotates, and via the clutch 26. The worm shaft 25 connected to the rotary shaft 10 is rotated. As a result, the worm wheel 28 and the output shaft 28a meshing with the worm shaft 25 rotate, and the rotational force of the output shaft 28a is transmitted to the regulator. The regulator lifts and lowers the window glass in accordance with the rotation direction of the output shaft 28a. Is done.

  At this time, when the mold IC 32 generates heat, the heat is transmitted to the heat sink 37. The space in which the control circuit member 4 is accommodated (that is, the internal space of the circuit accommodating portion 23 d and the cover 24) and the outside of the case 21 are communicated with each other through the air passage 29. And it becomes possible to apply external air directly to the mold IC 32. Further, the worm shaft 25 having the worm portion 25a rotates to cause the air inside the worm housing portion 23b to flow, and the worm housing portion 23b and the circuit housing portion 23d are communicated with each other through the communication hole 29b. For this reason, the air in the circuit housing portion 23d also easily flows. As a result, discharge of hot air in the case 21 from the air passage 29 is promoted, and air (outside air) outside the case 21 easily hits the heat sink 37 and the mold IC 32.

As described above, according to the present embodiment, the following operational effects are obtained.
(1) When the motor main body 2 is driven and the speed reduction mechanism 22 is operated, that is, when the worm shaft 25 is rotated, the worm housing portion 23b (and the wheel housing portion 23c) in the worm shaft 25 is rotated. Air is flowed. And since the worm accommodating part 23b and the circuit accommodating part 23d are connected by the ventilation path 29, the air in the circuit accommodating part 23d also flows through the ventilation path 29 with the operation of the speed reduction mechanism 22. Further, the worm housing part 23 b and the circuit housing part 23 d are communicated with the outside of the case 21 through the air passage 29. Therefore, when the speed reduction mechanism 22 is operated, an air flow easily occurs between the worm accommodating portion 23b and the circuit accommodating portion 23d and the outside of the case 21, and hot air in the circuit accommodating portion 23d is transferred from the air passage 29 to the case. It becomes easy to discharge to the outside of 21. Therefore, it is possible to suppress heat from being generated in the circuit housing portion 23d and the cover 24. In addition, air outside the case 21 can be taken from the air passage 29 and directly applied to the control circuit member 4. As a result, the cooling effect of the electric circuit components (such as the mold IC 32) provided in the control circuit member 4 can be enhanced with a simple configuration in which only the air passage 29 is provided. And it becomes possible to extend the continuous energization time to the motor 1.

  (2) Since the gear housing 23 constituting the case 21 includes an inner wall 23g that separates the worm housing portion 23b and the circuit housing portion 23d, the speed reduction mechanism 22 is operated by the inner wall 23g when the speed reduction mechanism 22 is operated. The strength of the gear housing 23 with respect to the load applied from is improved. Further, by providing the communication hole 29b in the inner wall 23g, the worm housing part 23b and the circuit housing part 23d are communicated with each other through the communication hole 29b, and the worm housing part 23b and the circuit housing part 23d are ventilated.

  (3) The air passage 29 has a shape in which the outer wall 23m and the inner wall 23g of the gear housing 23 are cut out from the outside of the gear housing 23 along the standing direction of the inner wall 23g, and the shape is simple. It is. When the gear housing 23 provided with the air passage 29 is molded, if the molding die for molding the gear housing 23 is provided with a single pin, the outer wall can be obtained by using the molding die. A gear housing 23 having an air passage 29 having an opening 29a at 23m and a communication hole 29b penetrating the inner wall 23g can be formed. Therefore, the air passage 29 having the communication hole 29b can be formed without using a complicated mold such as a slide mold. As a result, the cost for the mold can be reduced.

  (4) The communication hole 29b is formed in a portion corresponding to the control circuit member 4 in the inner wall 23g. Therefore, the air flowing into the circuit housing portion 23d and the cover 24 from the communication hole 29b is likely to hit the control circuit member 4. Therefore, the cooling effect of the heat sink 37 and electric circuit components (mold IC 32 etc.) provided in the control circuit member 4 can be further enhanced.

  (5) Since the waterproof sheet 30 does not have water permeability, it is possible to prevent water from entering the case through the air passage 29. On the other hand, since the waterproof sheet 30 has gas permeability, the flow of air between the inside and the outside of the case 21 performed through the air passage 29 is not hindered.

  (6) The air passage 29 also serves as a breathing hole for eliminating the pressure difference between the inside and outside of the motor 1. Therefore, it is not necessary to provide a breathing hole in the case 21 separately from the air passage 29. Therefore, the structure of the case 21 is simplified. Further, when a breathing hole is provided in the gear housing 23 in addition to the ventilation path 29, the gear housing 23 may be enlarged due to the provision of the breathing hole. However, as in the present embodiment, the ventilation path 29 is not provided. By also serving as a breathing hole, an increase in the size of the gear housing 23 due to the provision of a separate breathing hole is suppressed. As a result, an increase in the synthetic resin material used for manufacturing the gear housing 23 can be suppressed, and an increase in manufacturing cost can be suppressed. Further, since the air passage 29 also serves as a breathing hole, it is not necessary to separately provide a pin for forming the breathing hole in the mold for molding the gear housing 23. Therefore, the cost for the mold can be reduced.

  (7) The air in the circuit accommodating portion 23d is also caused to flow by utilizing the fact that the air in the worm accommodating portion 23b is caused to flow by the operation of the speed reduction mechanism 22 (worm shaft 25). Therefore, a configuration for causing the air in the circuit housing portion 23d to flow may not be provided in the case 21 separately. Therefore, it is possible to suppress an increase in the manufacturing cost while suppressing an increase in the size of the case 21.

In addition, you may change embodiment of this invention as follows.
The waterproof sheet 30 may be provided on the outer surface of the outer wall 23m of the gear housing 23 so as to cover the opening 29a of the communication hole 29b. Further, the waterproof sheet 30 may be omitted, and a waterproof pipe for preventing water from entering the case 21 may be attached to the opening 29a.

  -The position of the communication hole 29b in the inner wall 23g is not restricted to the position of the said embodiment. However, it is desirable that the communication hole that penetrates the inner wall 23g and communicates the worm accommodating portion 23b and the circuit accommodating portion 23d is formed in a portion of the inner wall 23g that faces a part of the control circuit member 4 or the worm shaft 25. For example, the communication hole 29b is formed in a portion of the inner wall 23g corresponding to the control circuit member 4 and a portion of the control circuit member 4 that faces the central portion of the rotating shaft 10 in the axial direction. Also good. If it does in this way, the air which flows in into the circuit accommodating part 23d from the communicating hole 29b will flow from the center part by the side of the inner wall 23g in the control circuit member 4 to the circumference | surroundings of the control circuit member 4. FIG. Therefore, uneven cooling of the electric circuit components (mold IC or the like) provided in the control circuit member 4 can be suppressed. For example, it may be formed at a position shown in FIGS. In FIGS. 4A to 4C, the same reference numerals are given to the same components as those in the above embodiment.

  The communication hole 61b shown in FIG. 4 (a) is formed in a portion facing the control circuit member 4 in the inner wall 23g. Specifically, the communication hole 61b is formed over the entire area of the inner wall 23g facing the mold IC 32 and the heat sink 37 that are preferably cooled, and the axial direction of the worm shaft 25 is greater than the communication hole 29b of the above embodiment. Is formed wide. This makes it easier for air flowing into the internal space of the circuit housing portion 23d and the cover 24 from the communication hole 29b to hit the control circuit member 4 in a wide range, thereby further improving the cooling effect of the electric circuit components provided in the control circuit member 4. Can be increased.

  Further, the communication hole 71b shown in FIG. 4B is formed in the inner wall 23g at a portion facing the worm portion 25a of the worm shaft 25. In general, when the worm shaft 25 is rotated, air tends to flow around the worm portion 25a. Therefore, when the communication hole 71b is formed in the portion facing the worm portion 25a in the inner wall 23g as described above, the air in the internal space of the circuit housing portion 23d and the cover 24 also easily flows. The cooling effect of the electric circuit components provided can be further enhanced.

  Further, the communication hole 81b shown in FIG. 4C is formed at a position avoiding a portion facing the worm portion 25a on the inner wall 23g. Note that the communication hole 81 b also faces the mold IC 32 and the heat sink 37 of the control circuit member 4. In the example shown in FIG. 4C, the position of the ventilation path 81 including the communication hole 81b is compared with the ventilation path 29 (including the communication hole 29b) of the above embodiment, depending on the position of the communication hole 81b. The position is closer to the motor body 2 side (upper side in FIG. 4C). In this way, even when the motor body 2 (see FIG. 1) is driven, the inside of the motor becomes hot and the lubricant applied to the worm portion 25a is scattered along with the rotation of the worm shaft 25. Since the inner wall 23g is interposed between the control circuit member 4 and the worm portion 25a of the worm shaft 25, adhesion of the lubricant to the control circuit member 4 can be suppressed. 4A to 4C, the squares of the two-dot chain lines shown in the communication holes 61b, 71b, 81b indicate the outer wall 23m (see FIG. 4) of the gear housing 23 in the communication holes 61b, 71b, 81b. FIG. 1 and FIG. 3) side opening (that is, the shape of a portion connected to a portion passing through the outer wall 23m in the air passage).

  In the above embodiment, the control circuit member 4 is provided with the heat sink 37. However, when the control circuit member 4 is sufficiently cooled by providing the air passage 29, the heat sink 37 may be omitted. If it does in this way, size reduction and weight reduction of the motor 1 can be achieved.

  The shape of the air passage 29 is such that the circuit housing portion 23d and the worm housing portion 23b (or wheel housing portion 23c) communicate with each other, and the circuit housing portion 23d and worm housing portion 23b (or wheel housing portion 23c) and the case 21 Any shape that communicates with the outside is not limited to the shape of the above embodiment. However, the air passage is formed so as to have a shape in which the outer wall 23m and the inner wall 23g are cut out from the outer side of the gear housing 23 along the direction in which the inner wall 23g is erected, and the thickness direction of the inner wall 23g and the inner wall are the same. When the width in the direction orthogonal to the standing direction of 23g is constant or is formed so as to become narrower as the distance from the outer wall 23m increases along the standing direction of the inner wall 23g, (3) in the above embodiment Similar effects can be obtained.

  In the above embodiment, the air passage 29 also serves as a breathing hole for eliminating the pressure difference between the inside and outside of the motor 1. However, the air passage 29 may be provided separately from the breathing hole. The air passage 29 communicates the circuit housing portion 23d and the worm housing portion 23b (or wheel housing portion 23c), and the circuit housing portion 23d and the worm housing portion 23b (or wheel housing portion 23c) and the outside of the case 21. If it is formed so as to communicate with each other, it may be formed at any position of the gear housing 23 and the cover 24.

  In the above embodiment, the case 21 includes the gear housing 23 and the cover 24 that is fixed to the gear housing 23. However, the case 21 may have a configuration without the cover 24, that is, a configuration with only the gear housing 23. In this case, all of the control circuit member 4 is accommodated in the gear housing 23, and the gear housing 23 does not include the opening 23f. The cover 24 may be made of a synthetic resin material.

  In the above embodiment, the gear housing 23 includes the inner wall 23g, but may have a configuration without the inner wall 23g. In this case, the ventilation path 29 is configured not to include the communication hole 29b penetrating the inner wall 23g.

  In the above embodiment, one air passage 29 is provided in the gear housing 23, but a plurality of air passages 29 may be provided. If it does in this way, while it will become easier to introduce the outside air of case 21 into case 21, and it will become easy to discharge | emit the hot air in case 21, the cooling effect of control circuit member 4 (especially mold IC) will be improved further. Can do.

  In the above embodiment, the electric circuit components provided in the control circuit member 4 are the mold IC 32, the capacitor 33, the choke coil 34, the Hall IC 35, and the oscillator 36 for LIN communication. The electric circuit component to be used is not limited to this. For example, it may be changed to an electric circuit component that does not include a part (for example, the choke coil 34), or may be changed to an electric circuit component that includes other elements.

  In the above embodiment, the present invention is embodied in the motor 1 for the power window device. However, for example, the present invention may be embodied in a motor for other devices such as a sunroof device, a slide door device, and a back door device. Good.

The technical ideas that can be grasped from each of the above embodiments and each of the above modifications are described below.
(A) In the motor according to any one of claims 1 to 8, the speed reduction part is assembled to the motor body, and the air passage is a breathing hole for eliminating a pressure difference between inside and outside the motor. A motor that also serves as a motor. According to this configuration, it is not necessary to provide a breathing hole in the case separately from the ventilation path. Therefore, the structure of the case is simplified.

(A) is a top view of a motor, (b) is the elements on larger scale of a motor. The partial expanded sectional view of a motor. The fragmentary sectional view of a gear housing (AA sectional view in Drawing 1 (b)). (A)-(c) is a partial cross section figure of the motor of another form.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Motor, 2 ... Motor main body, 3 ... Deceleration part, 4 ... Control circuit member, 21 ... Case, 22 ... Deceleration mechanism, 23b ... Worm accommodation part which comprises reduction mechanism accommodation part, 23c ... Constructing reduction mechanism accommodation part Wheel housing part, 23d ... circuit housing part, 23g ... inner wall, 23m ... outer wall, 25 ... worm shaft, 25a ... worm part, 29, 81 ... air passage, 29a ... opening, 29b, 61b, 71b, 81b ... communication Hole: 30 ... Waterproof sheet, 32 ... Mold IC as electric circuit component, 33 ... Capacitor as electric circuit component, 34 ... Choke coil as electric circuit component, 35 ... Hall IC as electric circuit component, 36 ... Electric circuit Oscillator as a part.

Claims (8)

A motor body that generates rotational force;
A speed reduction mechanism for reducing the rotation of the motor body, and a speed reduction part having a case including a speed reduction mechanism accommodation part and a circuit accommodation part for accommodating the speed reduction mechanism;
A motor including a control circuit member disposed in the circuit housing portion and having an electric circuit component,
The case has a ventilation path that communicates the speed reduction mechanism accommodating portion and the circuit accommodating portion, and communicates the speed reduction mechanism accommodating portion, the circuit accommodating portion, and the outside of the case. The motor according to claim 1,
The case includes an inner wall separating the speed reduction mechanism housing portion and the circuit housing portion therein.
The motor according to claim 1, wherein the air passage has a communication hole that penetrates the inner wall and communicates the speed reduction mechanism housing portion and the circuit housing portion. The motor according to claim 2,
The motor according to claim 1, wherein the air passage has a shape in which an outer wall and an inner wall of the case are cut out from an outer side of the case along a standing direction of the inner wall. In the motor according to claim 2 or claim 3,
The communication hole is formed in a portion of the inner wall facing the control circuit member. The motor according to claim 4,
The communication hole is formed in a portion of the inner wall facing the central portion of the control circuit member. In the motor according to claim 2 or claim 3,
The speed reduction mechanism includes a worm shaft having a worm portion and rotated by the motor body,
The motor is characterized in that the communication hole is formed in a portion of the inner wall facing the worm portion. In the motor according to claim 2 or claim 3,
The speed reduction mechanism includes a worm shaft having a worm portion and rotated by the motor body,
The motor is characterized in that the communication hole is formed at a position avoiding a portion facing the worm portion on the inner wall. The motor according to any one of claims 1 to 7,
A motor comprising a waterproof sheet that does not have water permeability but has gas permeability in an opening portion of the ventilation path provided on an outer wall of the case.

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