JP5090273B2 - motor - Google Patents

Description

  The present invention relates to a motor including a housing and a housing cover in which a sealing material is applied or disposed therebetween.

2. Description of the Related Art Conventionally, a motor or the like used for a vehicle wiper device or the like includes a housing for housing motor components (gear and the like) and a housing cover for closing an opening of the housing. As a motor that may be exposed to water, such as used in a vehicle wiper device, a sealing material is applied or disposed (intervened) between the housing and the housing cover along the opening. Is fastened and fixed by a screw member in the vicinity of the sealing material (see, for example, Patent Document 1). In such a motor, water intrusion into the housing and the housing cover is suppressed.
Japanese Utility Model Publication No. 58-149067

  However, in the motor as described above, there is a possibility that the sealing material is wound up by the screwing operation (fastening operation) of the screw member. Specifically, if the sealing material slightly touches the screw member during the screwing operation (fastening operation) of the screw member, the sealing material is wound around the screw member by a further screwing operation, and the sealing material is screwed from the original position. There is a risk of being taken by the member. This causes deterioration of the continuity of the sealing material along the opening (occurrence of discontinuity), which in turn causes a decrease in the effect of suppressing water intrusion into the housing and the housing cover.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a motor that can stably and stably obtain the effect of suppressing water intrusion into the housing and the housing cover.

  In the first aspect of the present invention, a sealing material is applied or disposed between a housing for housing the motor components and a housing cover for closing the opening of the housing, and the housing and the housing cover are screwed. In the motor fastened and fixed by a member, the housing and the housing cover are formed along the opening, and are fitted together by unevenness along the assembly direction of the housing and the housing cover, and An outer fitting portion that is formed along the opening and is formed along the assembling direction outside the inner fitting portion, and the screw between the inner fitting portion and the outer fitting portion. A fastening portion having a step in the assembly direction with respect to the fitting end portion of the inner fitting portion while the member is inserted therethrough Made, the sealing material is applied or placed mating end of the inner fitting portion.

  According to this configuration, the outer fitting portion has a maze structure in which the fitting is performed by the unevenness, so that water intrusion into the housing and the housing cover inside (inner fitting portion side) is suppressed. Further, in the inner fitting portion, the configuration of fitting by the unevenness not only forms a double maze structure in cooperation with the outer fitting portion, but also a sealing material is applied or arranged on the fitting end portion. Further, water intrusion into the housing and the housing cover is further effectively suppressed. Moreover, the fastening surface into which the screw member for fastening and fixing the housing and the housing cover is inserted between the inner fitting portion and the outer fitting portion is the fitting end portion of the inner fitting portion, that is, the sealing material. Since there is a step with respect to the portion to be applied or disposed, the sealing material is prevented from being wound by the screwing operation (fastening operation) of the screw member. Therefore, the continuity of the sealing material along the opening is prevented from being deteriorated (interruption), and the effect of suppressing water intrusion into the housing and the housing cover can be obtained with high stability.

  According to a second aspect of the present invention, in the motor according to the first aspect, the screw member is a fastening formed through one of the housing and the housing cover at a position corresponding to the fastening portion. The housing and the housing cover are fastened and fixed by being screwed into a female screw hole formed in a concave shape on the other of the housing and the housing cover through the through hole, and the inner fitting Of the inner convex portion and the inner concave portion constituting the portion, the inner convex portion is formed on the side of the housing and the housing cover where the female screw hole is formed.

  According to this configuration, the head of the screw member is disposed at a position opposite to the female screw hole and protruding from the fastening through hole. Here, for example, in the case where the motor is arranged so that the head of the screw member faces the top direction, between the inner fitting portion and the outer fitting portion through the fastening through hole from the head side. Liquid may enter. However, in this case, the inner convex portion constituting the inner fitting portion is formed on the side of the housing and the housing cover where the female screw hole is formed (the side opposite to the side where the fastening through hole is formed), and in the top direction. Since the liquid protrudes, it is prevented that the liquid that has entered enters the housing and the housing cover beyond the inner convex portion against gravity. Therefore, water intrusion into the housing and the housing cover is further suppressed.

  According to a third aspect of the present invention, in the motor according to the first or second aspect, the outer fitting portion is formed in a rectangular shape along corners of the housing and the housing cover, and the inner fitting portion Are formed in a substantially linear shape with the corners chamfered so that the fastening portion between the outer fitting portion and the outer fitting portion has a substantially triangular shape.

  According to this configuration, since the fastening portion is formed in a substantially triangular shape at the corners of the housing and the housing cover, the fastening portion (fastening with a screw member) is performed without forming the housing and the housing cover in a special shape. (Fixed) can be secured. In other words, it is not necessary to project and form, for example, a semicircular protruding portion (protrusion) on the housing and the housing cover for the fastening portion (fastening and fixing by the screw member). This not only facilitates the placement of the motor, but also simplifies the mold that forms the housing and the housing cover.

  According to a fourth aspect of the present invention, in the motor according to any one of the first to third aspects, the sealing material is at least one of both fitting side portions from the fitting end portion of the inner fitting portion. It was applied or placed over.

  According to the same configuration, since the sealing material is applied or arranged from the fitting end portion of the inner fitting portion to at least one of both fitting side portions, the sealing material also has a refracted shape and the The sealing material is applied or arranged on the entire fitting end, and for example, water immersion into the housing and the housing cover is further suppressed as compared with the case where the sealing material is applied or arranged only on the fitting end.

  ADVANTAGE OF THE INVENTION According to this invention, the motor which can obtain the effect of suppressing the water immersion in a housing and a housing cover highly stably can be provided.

Hereinafter, an embodiment in which the present invention is embodied in a vehicle wiper motor of a vehicle wiper device will be described with reference to FIGS.
As shown in FIG. 1A, a vehicle wiper motor (hereinafter simply referred to as a motor) 1 includes a motor body 2 and a gear portion 3. The motor body 2 includes a substantially bottomed cylindrical yoke housing 4, a plurality of magnets 5 fixed to the inner peripheral surface of the yoke housing 4, and a rotor (rotor) 6 accommodated in the yoke housing 4. It has. The rotor 6 has a rotation shaft 7, and a worm 8 is formed on the tip side of the rotation shaft 7 protruding from the opening of the yoke housing 4.

  The gear portion 3 includes a housing 11 (see FIG. 2), a housing cover 12 (see FIG. 3) for closing the opening 11a of the housing 11, and a connector member 13 (see FIG. 3) sandwiched between the housing 11 and the housing cover 12. 1 (a)), a worm wheel 14 accommodated in the housing 11 and the housing cover 12, a circuit board 15, and a brush holder device (not shown) for supplying power to the rotor 6 connected to the circuit board 15; Is provided. In the present embodiment, the worm 8, the worm wheel 14, the circuit board 15, the brush holder device (not shown), and the like constitute motor components that are accommodated in the housing 11 and the housing cover 12.

  The connector member 13 is formed so that an external connector (not shown) can be fitted, and is sandwiched between a connector clamping portion 12a (see FIG. 3) formed in a part of the housing cover 12 and a part of the opening 11a of the housing 11. Fixed.

  The worm wheel 14 is rotatably supported in the housing 11 and the housing cover 12 and meshes with the worm 8. The output shaft 14 a fixed so as to rotate integrally with the worm wheel 14 passes through a through hole 11 h formed in the center of the housing 11 and protrudes to the outside.

  The circuit board 15 is fixed in the housing 11 and the housing cover 12. The circuit board 15 includes a noise preventing element such as a capacitor and a choke coil (not shown), a rotation detecting element for detecting the rotation of the worm wheel 14, for example, a Hall element for detecting the rotation of a sensor magnet that rotates integrally with the worm wheel 14. Etc., and is electrically connected to a control device connected to the connector member 13 via an external connector.

  Here, as shown in FIG. 1B, a seal material 21 is interposed between the housing 11 and the housing cover 12, and the housing 11 and the housing cover 12 are fastened by screws 22 as screw members. It is fixed.

  Specifically, the housing 11 of the present embodiment is formed in a substantially rectangular shape when viewed from the opening direction of the opening portion 11a (the direction in which the housing cover 12 is assembled), and has a short side of the rectangle and close to one corner portion. A fixed portion 11b (see FIG. 1A and FIG. 2) to which the opening of the yoke housing 4 is fixed is formed at the position.

  The housing 11 is formed with an inner convex portion 11c along the opening 11a and an outer concave portion 11d along the opening 11a outside the inner convex portion 11c. Further, in the housing 11, the other three corner portions where the fixing portion 11b is not formed, and the position near the fixing portion 11b, the top portion of the inner protruding portion 11c between the inner protruding portion 11c and the outer recessed portion 11d. A housing-side mating surface 11e is formed which is stepped (formed at a position lower than the top of the inner protrusion 11c and higher than the bottom of the outer recess 11d). The outer recesses 11d corresponding to the three corners in the present embodiment are formed in a square shape along the corners, and the inner projections 11c corresponding to the outer recesses 11d are on the housing side between the outer recesses 11d. The mating surface 11e is formed in a substantially linear shape with the corners chamfered so as to have a substantially triangular shape. Further, the outer concave portion 11d corresponding to the position near the fixed portion 11b in the present embodiment is formed linearly along one side of the housing 11, and the inner convex portion 11c corresponding to the outer concave portion 11d is formed on the outer side. The housing-side mating surface 11e between the concave portion 11d and the concave portion 11d is formed in a bent shape that protrudes to the inner side of the housing 11 so as to have a substantially trapezoidal (or semicircular) shape. The housing 11 is formed with a female screw hole 11f that is recessed (not penetrating) from each housing side mating surface 11e.

  On the other hand, the housing cover 12 is formed with an inner concave portion 12c corresponding to the inner convex portion 11c and an outer convex portion 12d corresponding to the outer concave portion 11d. Further, in the housing cover 12, there are three corners where the fixing part 11b is not formed and a position corresponding to the position near the fixing part 11b, and the inner concave part 12c is located between the inner concave part 12c and the outer convex part 12d. A cover-side mating surface 12e having a step with respect to the bottom (formed at a position lower than the top of the outer convex portion 12d and higher than the bottom of the inner concave portion 12c) is formed. The housing cover 12 is formed with a fastening through hole 12f that passes through each cover side mating surface 12e. Further, as shown in FIG. 1B, a groove 12g having an arcuate cross section is further provided in the bottom of the inner recess 12c in the present embodiment.

  In the present embodiment, the inner convex portion 11c and the inner concave portion 12c constitute an inner fitting portion that is fitted by irregularities along the assembly direction of the housing 11 and the housing cover 12, and the outer concave portion 11d and the outer convex portion. 12d constitutes an outer fitting portion to be fitted by unevenness along the assembling direction. Further, in the present embodiment, the housing side mating surface 11e and the cover side mating surface 12e are inserted through the screw 22 and the fitting end of the inner fitting portion (the top of the inner convex portion 11c and the inner concave portion 12c). The fastening part which has a level | step difference in the said assembly direction with respect to a bottom part) is comprised.

  And the sealing material 21 is apply | coated or arrange | positioned (intervened) between the top part of the inner side convex part 11c, and the bottom part of the inner side recessed part 12c (fitting edge part of an inner side fitting part). The sealing material 21 of the present embodiment is a butyl rubber-based sealing material, and a melted material is applied (injected) to the inner concave portion 12c (including the groove 12g) using a nozzle, and the inner convex portion is formed in the inner concave portion 12c. 11c is arranged by being fitted. Also, the sealing material 21 of the present embodiment provided in this way is provided between the top of the inner convex portion 11c and the bottom of the inner concave portion 12c (from the fitting end of the inner fitting portion) to the inner convex portion 11c. It arrange | positions over between each between an outer wall and the inner-outer wall of the inner side recessed part 12c (both fitting side part) (refer FIG.1 (b)).

  The housing 11 and the housing cover 12 have the inner convex portion 11c fitted into the inner concave portion 12c (the sealing material 21 is disposed) and the outer convex portion 12d fitted into the outer concave portion 11d, and the screw 22 is fitted. It is fastened and fixed by passing through the fastening through hole 12f and screwing into the female screw hole 11f.

  The motor 1 of the present embodiment configured as described above is mounted on a vehicle (not shown) so that the head portion 22a of the screw 22 faces the sky, and the wiper arm is connected to the output shaft 14a via a link mechanism (not shown). (Wiper blade) will be connected.

Next, characteristic effects of the above embodiment will be described below.
(1) In the outer fitting portion (the outer concave portion 11d and the outer convex portion 12d), the configuration in which the concave and convex portions are fitted is a labyrinth structure. It is suppressed. Further, in the inner fitting portion (the inner convex portion 11c and the inner concave portion 12c), not only the configuration of fitting by the unevenness cooperates with the outer fitting portion to form a double maze structure, but also the fitting end portion thereof. Since the sealing material 21 is applied to or disposed on the housing 11, the water immersion into the housing 11 and the housing cover 12 (such as the wetness of the circuit board 15) is further effectively suppressed. Moreover, a fastening surface (housing side mating surface 11e and cover side mating surface 12e) through which screws 22 for fastening and fixing the housing 11 and the housing cover 12 are inserted between the inner fitting portion and the outer fitting portion. ) Has a step with respect to the fitting end portion of the inner fitting portion, that is, the portion where the sealing material 21 is applied or arranged, so that the sealing material 21 is wound by the screwing operation (fastening operation) of the screw 22. Is prevented. Therefore, the continuity of the sealing material 21 along the opening 11a is prevented from being deteriorated (disruption), and the effect of suppressing water intrusion into the housing 11 and the housing cover 12 can be obtained with high stability. it can.

  (2) The head portion 22a of the screw 22 is disposed at a position opposite to the female screw hole 11f and protruding from the fastening through hole 12f. And when the motor 1 is arrange | positioned so that the head part 22a of the screw | thread 22 may face the top direction like this Embodiment, an inner fitting part and an outer side through the fastening through-hole 12f from the head part 22a side. There is a possibility that liquid may enter between the fitting portion. However, in this case, the inner convex portion 11c constituting a part of the inner fitting portion is formed on the side of the housing 11 and the housing cover 12 where the female screw hole 11f is formed (the side opposite to the side where the fastening through hole 12f is formed). ) And project in the top direction (anti-gravity direction) (see FIG. 1B), so that the infiltrated liquid goes over the inner convex portion 11c and goes into the housing 11 and the housing cover 12 against the gravity. It is prevented. Accordingly, water intrusion into the housing 11 and the housing cover 12 is further suppressed.

  (3) At three corners of the corners of the housing 11 and the housing cover 12, fastening portions (housing side mating surface 11e and cover side mating surface 12e) are formed in a substantially triangular shape. And the fastening part (fastening fixation with the screw | thread 22) can be ensured, without making the housing cover 12 into a special shape. In other words, it is not necessary to project and form, for example, a semicircular protrusion (protrusion) on the housing 11 and the housing cover 12 for the fastening portion. Thereby, not only the arrangement of the motor 1 is facilitated, but also the mold for forming the housing 11 and the housing cover 12 can be simplified.

  (4) The sealing material 21 includes an inner / outer wall of the inner protrusion 11c and an inner / outer wall of the inner recess 12c between the top of the inner protrusion 11c and the bottom of the inner recess 12c (fitting end of the inner fitting portion). Therefore, the water immersion into the housing 11 and the housing cover 12 is further suppressed as compared with the case where it is applied or arranged only at the fitting end, for example. The

The above embodiment may be modified as follows.
-The structure of fastening and fixing with the screw 22 of the above embodiment may be changed to another structure. For example, the female screw hole 11f may be changed to a penetrating female screw hole. Moreover, when it changes to a female screw hole, you may change the screw 22 into the volt | bolt and nut as a screw member. Further, a fastening through hole may be formed in the housing 11 and a female screw hole may be formed in the housing cover 12 to be fastened and fixed with screws. Of course, the motor 1 may be attached to the vehicle so that the head portion 22a of the screw 22 does not face upward.

  -In above-mentioned embodiment, the inner side convex part 11c which comprises a part of inner fitting part is the side in which the female screw hole 11f in the housing 11 and the housing cover 12 was formed (the side in which the fastening through-hole 12f was formed). However, the present invention is not limited to this, and the inner convex portion may be formed on the side where the fastening through hole is formed. That is, the inner convex portion may be formed on the housing cover 12 side and the inner concave portion may be formed on the housing side. Further, the outer convex portion may be formed on the housing 11 side, and the outer concave portion may be formed on the housing cover 12 side.

  In the above embodiment, the fastening portion (housing side matching surface 11e and cover side matching surface 12e) is formed in a substantially triangular shape at three corners of the corners of the housing 11 and the housing cover 12. However, the present invention is not limited to this, and may be changed to other shapes. For example, the housing 11 and the housing cover 12 may be formed with semicircular protruding portions (protrusions) so as to form fastening portions (housing side matching surfaces and cover side matching surfaces).

  In the above embodiment, the sealing material 21 is formed between the top of the inner convex portion 11c and the bottom of the inner concave portion 12c (the fitting end portion of the inner fitting portion) to the inner and outer walls of the inner convex portion 11c and the inner concave portion 12c. However, the present invention is not limited to this, for example, between the top portion of the inner convex portion 11c and the bottom portion of the inner concave portion 12c (inner side). It may be arranged only at the fitting end portion of the fitting portion, or between the top portion of the inner convex portion 11c and the bottom portion of the inner concave portion 12c (fitting end portion of the inner fitting portion) to the inner convex portion. You may make it arrange | position the sealing material 21 over either one between the inner and outer wall of 11c, and the inner and outer wall of the inner side recessed part 12c.

-If the sealing material 21 of the said embodiment is similarly arrange | positioned, you may change to another sealing material, and may be arrange | positioned with another method.
In the above-described embodiment, the vehicle wiper motor is embodied, but may be embodied in another (for example, a power window motor).

The technical idea that can be grasped from the above embodiments will be described below together with the effects thereof.
(A) The motor according to claim 2 is mounted on the vehicle so that the head of the screw member faces the top direction.

  According to this configuration, the effect of the invention according to claim 2 can be effectively obtained in a wiper motor that is particularly easily wetted.

(A) The external view which shows the motor of this Embodiment. (B) Sectional drawing along AA of (a). The perspective view of the housing of this Embodiment. The perspective view of the housing cover of this Embodiment.

Explanation of symbols

  8 ... Worm constituting a part of the motor component, 11 ... Housing, 11a ... Opening part, 11c ... Inner convex part constituting a part of the inner fitting part, 11d ... Part of the outer fitting part Outer concave portion, 11e ... Housing side mating surface constituting a part of the fastening joint portion, 11f ... Female screw hole, 12 ... Housing cover, 12c ... Inner concave portion constituting a part of the inner fitting portion, 12d ... Outer fitting portion , 12e... Cover side mating surface constituting a part of the fastening portion, 11f .. fastening through hole, 14... Worm wheel constituting a part of motor components, 15. A circuit board constituting a part of the component, 21... Sealing material, 22.

Claims (4)

In a motor in which a sealing material is applied or arranged between a housing for housing motor components and a housing cover for closing an opening of the housing, and the housing and the housing cover are fastened and fixed by a screw member. ,
In the housing and the housing cover,
An inner fitting portion that is formed along the opening and is fitted by unevenness along the assembly direction of the housing and the housing cover;
An outer fitting portion that is formed along the opening and is formed along the assembly direction on the outside of the inner fitting portion; and
A fastening portion having a step in the assembly direction with respect to a fitting end portion of the inner fitting portion while the screw member is inserted between the inner fitting portion and the outer fitting portion,
Is formed, and the sealing material is applied or arranged on the fitting end portion of the inner fitting portion. The motor according to claim 1,
The screw member passes through a fastening through hole formed through one of the housing and the housing cover at a position corresponding to the fastening portion, and is concave in the other of the housing and the housing cover. The housing and the housing cover are fastened and fixed by being screwed into a female screw hole formed in
Of the inner convex portion and the inner concave portion constituting the inner fitting portion, the inner convex portion is formed on a side of the housing and the housing cover where the female screw hole is formed. . The motor according to claim 1 or 2,
The outer fitting portion is formed in a square shape along corners of the housing and the housing cover,
The motor according to claim 1, wherein the inner fitting portion is formed in a substantially linear shape having a chamfered corner so that the fastening portion between the inner fitting portion and the outer fitting portion has a substantially triangular shape. The motor according to any one of claims 1 to 3,
The motor is characterized in that the sealing material is applied or arranged from the fitting end portion of the inner fitting portion to at least one of both fitting side portions.

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