JP4255792B2 - motor - Google Patents

Description

  The present invention relates to a motor with a speed reduction mechanism provided with a gear housing having a board housing portion capable of housing a circuit board.

Various configurations of a circuit board built-in motor configured by housing a circuit board in a housing have been proposed (see, for example, Patent Document 1).
The motor disclosed in this patent document is a motor with a speed reduction mechanism, and is configured by integrally assembling a motor body and a speed reduction portion. The speed reducing portion has a resin gear housing, and a wheel housing portion for housing the worm wheel and a substrate housing portion for housing the circuit board are formed in the gear housing. The board housing portion is provided on the opposite side of the wheel housing portion with the rotation axis in between, and the flat direction of the wheel housing portion (the direction parallel to the paper surface of FIG. 1 of Reference 1) and the plane direction of the circuit board are parallel to each other. The circuit board is accommodated in such a manner.
JP 2002-218698 A

  However, the motor gear housing having such a configuration has a problem in that the board housing portion has a large protrusion and the outer shape is large when viewed from the direction perpendicular to the flat direction of the wheel housing portion, that is, the axial direction of the output shaft of the motor. It was. Further, in the configuration in which the circuit board is accommodated so that the planar direction of the circuit board is parallel to the flat direction of the wheel accommodating portion as in the gear housing, there has been a problem of further miniaturization of the housing.

The present invention has been made in view of such circumstances, and an object thereof is to provide a gear housing having a board housing portion capable of housing a circuit board, and a direction perpendicular to the flat direction of the wheel housing portion of the gear housing. An object of the present invention is to provide a motor in which the outer shape of the gear housing can be reduced by reducing the protrusion of the substrate housing portion in the direction orthogonal to the axial direction of the rotation axis of the motor body .

In order to solve the above-described problem, an invention according to claim 1 includes a gear housing that is integrally connected to a motor main body and that houses a worm wheel that is drivingly connected to a rotating shaft that is rotated by driving of the motor main body. A motor configured to accommodate a circuit board in a gear housing, wherein the motor is used as a drive source of a power window device, and the gear housing includes a wheel accommodating portion that accommodates the worm wheel; The wheel housing portion includes a substrate housing portion that is provided on the opposite side of the rotation shaft and houses the circuit board, and the substrate housing portion rotates in the longitudinal direction of the circuit board. To accommodate the circuit board so that it is parallel to the axial direction of the shaft and the plane direction of the circuit board is orthogonal to the flat direction of the wheel accommodating portion It has been made.

According to a second aspect of the present invention, in the motor according to the first aspect, the circuit board has a substantially rectangular shape .

According to a third aspect of the present invention, in the motor according to the first or second aspect , a hall element is provided in the vicinity of a sensor magnet fixed to the rotary shaft in order to obtain rotation information of the rotary shaft. A plurality of electric circuit components including the Hall elements are mounted on the circuit board accommodated in the substrate accommodating portion, and the electric circuit components include all the components including the Hall elements. Is disposed on the surface of the circuit board on the counter-rotating shaft side, or components other than the Hall element are disposed on the surface of the circuit board on the counter-rotating shaft side.
According to a fourth aspect of the present invention, in the motor according to the first or second aspect, a hall element is provided in the vicinity of a sensor magnet fixed to the rotary shaft in order to obtain rotation information of the rotary shaft. And the circuit board housed in the board housing portion is mounted with electrical circuit components including the Hall element, relay and capacitor, and the Hall element is a surface on the rotating shaft side of the circuit board. The relay and the capacitor are arranged on the surface of the circuit board on the counter-rotating shaft side.

According to a fifth aspect of the present invention, in the motor according to any one of the first to fourth aspects, the circuit board housing portion is inserted with the circuit board on the motor main body side and closed by the motor main body. Has an opening.
According to a sixth aspect of the present invention, in the motor according to any one of the first to fifth aspects, a connector portion configured to be connectable to an external connector is electrically connected to the circuit board. The connector portion configured and connected to the circuit board has a connecting direction with the external connector in a direction orthogonal to the axial direction of the rotating shaft and in a direction orthogonal to the flat direction of the wheel accommodating portion. Is set.

(Function)
According to the first aspect of the present invention, the board housing portion of the gear housing is configured such that the longitudinal direction of the circuit board is parallel to the axial direction of the rotation shaft, and the planar direction of the circuit board is the flatness of the wheel housing portion. It is configured to accommodate the circuit board so as to be orthogonal to the direction. Therefore, when viewed from a direction perpendicular to the flat direction of the wheel housing portion, the overhang of the substrate housing portion configured in this way is small, and the outer shape of the gear housing can be made small.

Moreover, the board | substrate accommodating part is provided in the opposite side on both sides of a rotating shaft with respect to a wheel accommodating part. Therefore, when designing the gear housing, it is not necessary to consider interference between the circuit board accommodated in the substrate accommodating portion and the worm wheel accommodated in the wheel accommodating portion, and the housing can be easily designed.
According to the second aspect of the present invention, since the circuit board has a substantially rectangular shape, the overhang of the board housing portion can be further reduced .

According to the third aspect of the present invention, the electric circuit component mounted on the circuit board is such that all the components including the Hall element are arranged on the surface on the side opposite to the rotation axis of the circuit board, or components other than the Hall element are provided. It is arranged on the surface of the circuit board opposite to the rotation axis. Therefore, if all the components including the Hall element are arranged on the surface on the side opposite to the rotation axis of the circuit board, the circuit board can be configured to be small when viewed from the direction perpendicular to the flat direction of the wheel housing portion. The overhang of the accommodating portion can be further reduced. Even if components other than the Hall element are arranged on the surface on the counter-rotating shaft side of the circuit board and the Hall element is arranged on the surface on the rotating shaft side, the configuration is small when viewed from the direction perpendicular to the flat direction of the wheel housing portion. And the overhang of the substrate housing portion can be further reduced. In addition, since the Hall element is disposed on the surface on the rotating shaft side, the distance from the sensor magnet fixed to the rotating shaft can be reduced, and the detection sensitivity of the Hall element can be improved.

  According to the fifth aspect of the present invention, the board housing portion has an opening for inserting the circuit board on the motor body side and being closed by the motor body. For this reason, there is no need to provide a special member for closing the opening of the board housing portion, so that the number of parts and assembly man-hours can be reduced accordingly.

According to the present invention, a gear housing having a board housing portion capable of housing a circuit board is provided, and is orthogonal to the axial direction of the rotating shaft of the motor body as viewed from the direction perpendicular to the flat direction of the wheel housing portion of the gear housing. A motor capable of reducing the outer shape of the gear housing can be provided by reducing the overhang of the substrate housing portion in the direction .

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
FIG.1 and FIG.2 shows the motor 1 of this embodiment. The motor 1 is used as a drive source of a vehicle power window device, and is attached to a vehicle door (not shown). The motor 1 is a motor with a speed reduction mechanism, and includes a motor body 2 and a speed reduction unit 3.

  The motor body 2 is configured as a direct current motor. The motor body 2 includes a bottomed cylindrical yoke housing 4. A pair of magnets 5 are fixed to the inner surface of the yoke housing 4. Inside the magnet 5, an armature (armature) 6 is rotatably accommodated. The armature 6 has a rotation shaft 7, and the tip of the rotation shaft 7 is inserted into the speed reduction portion 3. The rotating shaft 7 has a commutator 8, and a pair of brushes 10 held by a brush holder 9 are in sliding contact with the commutator 8. A ring-shaped sensor magnet 11 is fixed to the front end side of the commutator 8 on the rotating shaft 7 so as to rotate integrally with the rotating shaft 7.

  The speed reduction unit 3 includes a gear housing 15 that is molded into a predetermined shape from a resin material. The gear housing 15 is connected to the yoke housing 4 (the motor body 2) by screws 16. The gear housing 15 is formed with a shaft accommodating portion 15a that accommodates the rotating shaft 7, and a substantially circular wheel accommodating portion 15b that extends from the shaft accommodating portion 15a to one side in a direction perpendicular to the direction of the axis L1 of the rotating shaft 7. Is formed. A worm wheel 17 constituting a speed reduction mechanism is rotatably accommodated in the wheel accommodating portion 15b. The worm wheel 17 meshes with a worm 7 a provided on the rotary shaft 7, decelerates the rotation of the rotary shaft 7, and transmits it to the output shaft 18 fixed to the central portion of the worm wheel 17. The output shaft 18 is drivingly connected to a window regulator that opens and closes the window glass.

  The gear housing 15 is provided with a substrate housing portion 15c extending long along the direction of the axis L1 of the rotating shaft 7 on the opposite side of the rotating shaft 7 from the wheel housing portion 15b. The board housing portion 15c inserts the circuit board 19 so that the planar direction of the circuit board 19 is orthogonal to the flat direction of the gear housing 15 (wheel housing section 15b) (direction parallel to the paper surface of FIGS. 1 and 2). It is configured to accommodate. For this reason, the board housing portion 15c has a small extension of its outer shape as viewed from a direction orthogonal to the flat direction of the gear housing 15 (wheel housing portion 15b) (in the direction of the axis L2 of the output shaft 18).

  Note that the opening of the board accommodating portion 15c into which the circuit board 19 is inserted is shared with the opening 15d used for inserting the rotating shaft 7 extending from the motor body 2 into the gear housing 15 or the like. The opening 15d is closed by the motor body 2 (yoke housing 4) after the circuit board 19 is accommodated.

  As shown in FIG. 3, the circuit board 19 has a rectangular plate shape, and its longitudinal direction is inserted along the direction of the axis L1 of the rotating shaft 7, and the plane direction of the board 19 is the gear housing 15 (wheel wheel). It is accommodated so as to be orthogonal to the flat direction of the accommodating portion 15b). The circuit board 19 is mounted with a number of electric circuit components for constituting a circuit for driving and controlling the motor 1 (motor body 2) and a circuit for detecting rotation information such as the rotation speed and rotation direction of the rotating shaft 7. . This electric circuit component includes a control IC 20a, a relay 20b, a capacitor 20c, a Hall element 20d, and the like.

  Since the control IC 20a, the relay 20b, and the capacitor 20c are components having a large outer shape among electric circuit components, the control IC 20a, the relay 20b, and the capacitor 20c are disposed on the surface (surface) A1 of the circuit board 19 on the counter-rotating shaft 7 side. Further, since the Hall element 20d is a component having a small outer shape among electric circuit components, a position in the vicinity of the sensor magnet 11 fixed to the rotation shaft 7 on the surface (back surface) A2 of the circuit board 19 on the rotation shaft 7 side. It is arranged to become. The hall element 20d detects a change in the magnetic field of the sensor magnet 11 that rotates together with the rotation shaft 7, and obtains rotation information such as the rotation speed and rotation direction of the rotation shaft 7.

  A connector portion 21 is mounted on the surface A1 of the circuit board 19 on the opening 15d side of the gear housing 15. The connector unit 21 is configured to be connectable to an external connector (not shown) for receiving power supply from the outside and exchanging signals with the outside. The connector portion 21 is set so that the direction of connection with the external connector is orthogonal to the direction of the axis L1 of the rotary shaft 7 and the direction of the axis L2 of the output shaft 18. A plurality (six in this embodiment) of terminals 22 are insert-molded and fixed to the connector portion 21.

  Here, a mounting hole 15 e into which the connector portion 21 is inserted from the direction of the axis L 1 of the rotary shaft 7 is formed at a portion corresponding to the connector portion 21 on the opening 15 d side of the gear housing 15. Then, the circuit board 19 is inserted and accommodated in the board accommodating portion 15 c so that the connector portion 21 is fitted in the mounting hole 15 e of the gear housing 15. A seal member 15 f is provided between the mounting hole 15 e and the connector portion 21.

  A brush power supply terminal (not shown) is provided on the side of the circuit board 19 on the side of the opening 15d of the gear housing 15. On the other hand, a brush side connection terminal (not shown) that is electrically connected to the brush 10 is fixed to the brush holder 9. Then, the circuit board 19 is accommodated in the gear housing 15 (substrate accommodating portion 15c), and at the same time as the housing 15 and the motor body 2 are assembled, the brush feeding terminal and the brush side connection terminal are connected. ing. Thereby, the connector part 21, the circuit board 19, and the motor main body 2 will be in the state electrically connected mutually, and the motor 1 is completed.

Next, the features of this embodiment are listed below.
(1) The board housing portion 15c of the gear housing 15 of the present embodiment is such that the longitudinal direction of the circuit board 19 is parallel to the direction of the axis L1 of the rotary shaft 7 and the planar direction of the circuit board 19 is the gear housing 15 The circuit board 19 is configured to be accommodated so as to be orthogonal to the flat direction of the (wheel accommodating portion 15b). For this reason, when viewed from the direction perpendicular to the flat direction of the wheel housing portion 15b (the direction of the axis L2 of the output shaft 18), the overhang of the substrate housing portion 15c configured in this way is small, and the outer shape of the gear housing 15 is configured to be small. can do. Therefore, the motor 1 can be miniaturized and the mountability is improved.

(2) Since the circuit board 19 of the present embodiment has a rectangular shape, the overhang of the board housing portion 15c can be further reduced.
(3) The substrate housing portion 15c of this embodiment is provided on the opposite side of the rotating shaft 7 from the wheel housing portion 15b. Therefore, when designing the gear housing 15, it is not necessary to consider the interference between the circuit board 19 accommodated in the substrate accommodating portion 15c and the worm wheel 17 accommodated in the wheel accommodating portion 15b, and the housing 15 can be easily designed. It can be.

  (4) In the present embodiment, the electrical circuit components (20a to 20d) mounted on the circuit board 19 are components (control IC 20a, relay 20b, and capacitor 20c) other than the Hall element 20d. It is arranged on the side surface (surface) A1. Therefore, components (control IC 20a, relay 20b, and capacitor 20c) other than the Hall element 20d are arranged on the front surface A1 of the circuit board 19, and the Hall element 20d is arranged on the surface (rear surface) A2 of the circuit board 19 on the rotating shaft 7 side. By doing so, it can be configured to be small when viewed from the direction orthogonal to the flat direction of the wheel housing portion 15b (the direction of the axis L2 of the output shaft 18), and the overhang of the substrate housing portion 15c can be further reduced. Moreover, since the Hall element 20d is disposed on the surface (back surface) A2 on the rotating shaft 7 side, the distance from the sensor magnet 11 fixed to the rotating shaft 7 can be reduced, and the detection sensitivity of the Hall element 20d is improved. be able to.

  (5) The board housing portion 15 c of the present embodiment has an opening 15 d that is inserted into the circuit board 19 on the motor body 2 side and is closed by the motor body 2. For this reason, there is no need to provide a special member for closing the opening 15d of the substrate housing portion 15c, so that the number of parts and the number of assembling steps can be reduced accordingly.

In addition, you may change embodiment of this invention as follows.
The configuration of the substrate housing portion 15c in the above embodiment may be changed as appropriate. For example, although the substrate accommodating portion 15c of the above embodiment is provided on the opposite side of the wheel accommodating portion 15b with the rotation shaft 7 in between, the substrate accommodating portion 15c and the wheel accommodating portion 15b are arranged in the same direction with respect to the rotating shaft 7. It may be arranged. Further, although the opening of the substrate housing portion 15c is shared with the opening 15d used for inserting the rotary shaft 7 into the gear housing 15, etc., an opening for the substrate housing portion 15c may be provided separately. In addition, a slit for inserting and guiding the circuit board 19 may be formed in the board housing portion 15c of the above embodiment. In this way, the circuit board 19 can be smoothly inserted into the board housing portion 15c along the slit.

  In the above embodiment, the circuit board 19 is inserted along the axis L1 of the rotary shaft 7 into the board housing portion 15c from the opening 15d on the motor body 2 side, and the plane direction of the board 19 is the gear housing 15 (wheel It accommodated so as to be orthogonal to the flat direction of the accommodating part 15b). For example, as shown in FIG. 5, the circuit board 19 is opened along the direction perpendicular to the direction of the axis L1 of the rotary shaft 7 and the direction of the axis L2 of the output shaft 18 from the opening. May be inserted so that the planar direction of the substrate 19 is orthogonal to the flat direction of the gear housing 15. In this case, after the circuit board 19 is accommodated, the cover 15g having the sealing member 15h is attached to the side opening of the substrate accommodating portion 15c, and the accommodating portion 15c is closed.

The shape of the circuit board 19 and the configuration and arrangement of the electric circuit components on the circuit board 19 in the above embodiment are not limited to this, and may be changed as appropriate.
For example, the circuit board 19 of the above embodiment is formed in a rectangular shape, but may be other than this shape. In the above embodiment, the Hall element 20d is disposed on the back surface A2 of the circuit board 19, and components (control IC 20a, relay 20b, and capacitor 20c) other than the Hall element 20d are disposed on the front surface A1 of the circuit board 19. All components (20a to 20d) including the element 20d may be arranged on the surface A1 of the circuit board 19. If it does in this way, circuit board 19 can be constituted small seeing from the direction (axis line L2 direction of output axis 18) perpendicular to the flat direction of wheel storage part 15b, and the overhang of board storage part 15c is made smaller. be able to. The Hall element 20d is disposed with the sensor magnet 11 and the circuit board 19 interposed therebetween, but can be sufficiently detected.

  Moreover, you may use the circuit boards 19a-19d of the structure shown to Fig.4 (a)-(d). In the circuit board 19 of the above embodiment, the connecting direction of the connector portion 21 with the external connector is set in a direction orthogonal to the axis L1 direction of the rotating shaft 7 and the axis L2 direction of the output shaft 18, but FIG. ), The connecting direction of the connector portion 21 with the external connector may be set to a direction orthogonal to the axis L1 direction of the rotating shaft 7 and parallel to the axis L2 direction of the output shaft 18. Good. Further, as in the circuit board 19b of FIG. 4B, the connecting direction of the connector portion 21 to the external connector is the side opposite to the motor body 2 in the direction parallel to the direction of the axis L1 of the rotating shaft 7, and the output shaft 18 You may set to the direction orthogonal to the axis line L2 direction. Further, as in the circuit board 19c of FIG. 4C, the connecting direction of the connector portion 21 to the external connector is the motor body 2 side in the direction parallel to the axis L1 direction of the rotating shaft 7, and the axis of the output shaft 18 You may set to the direction orthogonal to L2 direction. Moreover, it is good also as a structure which connects the brush 10 with the circuit board 19 previously like the circuit board 19d of FIG.4 (d).

  Moreover, although the connector part 21 was provided integrally with the circuit board 19, the connector part 21 and the circuit board 19 may be separated. Alternatively, the connector portion 21 may be provided integrally with the gear housing 15, and the circuit board 19 and the connector portion 21 provided on the gear housing 15 may be connected when the circuit board 19 is inserted.

The configuration of the motor 1 (the motor main body 2 and the speed reduction unit 3) of the above embodiment may be changed as appropriate in addition to the above.
In the above embodiment, the motor 1 is used as a drive source of the vehicle power window device, but a motor used in other devices may be used.

Sectional drawing of the motor of this embodiment. The exploded view of the motor. The side view of the gear housing of the motor. (A)-(d) is a figure for demonstrating the structure of the circuit board of another example. The exploded view of the motor of another example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 2 ... Motor main body, 7 ... Rotating shaft, 11 ... Sensor magnet, 15 ... Gear housing, 15b ... Wheel accommodating part, 15c ... Substrate accommodating part, 15d ... Opening, 17 ... Worm wheel, 19, 19a-19d ... Circuit board, 20a ... Control IC as an electric circuit component, 20b ... Relay as an electric circuit component, 20c ... Capacitor as an electric circuit component, 20d ... Hall element as an electric circuit component, A1 ... Surface (surface) on the side of the counter-rotating shaft 7 , A2: surface (rear surface) on the rotating shaft 7 side, L1: axis.

Claims (6)

A motor that is integrally connected to a motor body, has a gear housing that houses a worm wheel that is driven and connected to a rotating shaft that rotates by driving the motor body, and is configured to house a circuit board in the gear housing. And
The motor is used as a drive source of a power window device,
The gear housing includes a wheel accommodating portion that accommodates the worm wheel, and a substrate accommodating portion that is provided on the opposite side of the rotating shaft from the wheel accommodating portion and accommodates the circuit board.
The board housing portion is arranged so that the longitudinal direction of the circuit board is parallel to the axial direction of the rotation shaft, and the planar direction of the circuit board is orthogonal to the flat direction of the wheel housing section. A motor characterized by being configured to accommodate. The motor according to claim 1,
The motor according to claim 1, wherein the circuit board has a substantially rectangular shape. The motor according to claim 1 or 2,
In order to obtain rotation information of the rotating shaft, a Hall element is provided in the vicinity of a sensor magnet fixed to the rotating shaft,
The circuit board housed in the board housing portion is mounted with a number of electrical circuit components including the Hall element,
In the electrical circuit component, all components including the Hall element are arranged on the surface on the counter-rotating shaft side of the circuit board, or components other than the Hall element are arranged on the surface on the counter-rotating axis side of the circuit board. motor, characterized in that is. The motor according to claim 1 or 2 ,
In order to obtain rotation information of the rotating shaft, a Hall element is provided in the vicinity of a sensor magnet fixed to the rotating shaft,
The circuit board housed in the board housing portion is mounted with electrical circuit components including the Hall element, relay and capacitor,
The motor is characterized in that the Hall element is disposed on a surface of the circuit board on the rotating shaft side, and the relay and the capacitor are disposed on a surface of the circuit board on the counter-rotating shaft side . The motor according to any one of claims 1 to 4,
The motor is characterized in that the board housing portion has an opening for inserting the circuit board on the motor body side and being closed by the motor body. The motor according to any one of claims 1 to 5,
The circuit board is configured to be electrically connected to a connector portion configured to be connectable to an external connector, and the connector portion connected to the circuit board has a connecting direction to the external connector. A motor characterized in that the motor is set in a direction perpendicular to the axial direction of the rotating shaft and perpendicular to the flat direction of the wheel housing portion.

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