JP4087315B2 - Casing structure and motor - Google Patents

Description

  The present invention relates to a casing structure that houses electrical components including an earth terminal, and a motor that employs the casing structure.

Conventionally, a motor or the like used in a vehicle wiper device or the like has a motor body and a gear portion. The gear part accommodates electrical parts such as gears and various terminals inside a housing and a cover that closes the opening of the housing. And as such a motor (casing structure), a part of earth terminal as an electrical component (a joint fastening part) is attached to a part where both edges of the housing and the cover (fitting surface to be overlapped) are fastened. Some are electrically connected to a housing or a cover made of a conductive material by being sandwiched (see, for example, Patent Document 1). Specifically, the housing and the cover are fastened with screws that pass through holes formed in one edge (for example, the cover) and are screwed into holes (internal thread holes) formed in the other (for example, the housing). In addition, the joint connection portion is electrically connected by being sandwiched between the two edge portions. In such a motor (casing structure), it is possible to use an electrically conductive material while obtaining a high reliability of the connection of the internal ground terminal without using a lead wire or the like, and without requiring work such as soldering. It can be electrically connected to a housing and a cover.
JP-A-11-150910

  By the way, in the case of a motor used in a vehicle wiper device, a power window device, etc., it is necessary to seal between both edge portions of the housing and the cover so that water (liquid) does not enter inside the housing and the cover. A sealing member such as a rubber material is interposed between the (fitting surfaces to be overlapped). However, in the motor as described above, since holes and holes (female screw holes) for fastening and fixing screws are arranged at both edges (fitting surfaces to be overlapped) for interposing the seal member, both of them are arranged. If the sealing member is not provided in the tightening connection portion (when the sealing member is interrupted), the waterproof property deteriorates at that portion. Further, when the sealing member is provided on the joint fastening connection portion (when the sealing member is provided continuously), the waterproof property is improved, but when the joint fastening connection portion is sandwiched, the sealing member is pressurized. Since there is a possibility that the surface that can be contacted by the co-clamping connection part is extremely small, the reliability of the electrical connection between the co-clamping connection part and the housing or the cover is deteriorated.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a casing structure and a motor that can improve waterproofness while ensuring reliability of electrical connection of a ground terminal. Is to provide.

In the first aspect of the present invention, the edges of the first and second casings, at least one of which is made of a conductive material, are combined, and a fastening member is inserted into a fastened portion formed at a predetermined position of the edge. The first and second casings are fastened and fixed to each other, and electrical parts including a ground terminal are accommodated in the first and second casings, and a joint fastening portion formed on the ground terminal is fastened and fixed. And a casing structure that is clamped to the fastened portion while being in contact with a casing made of a conductive material among the first and second casings, wherein the first and second casings are fastened together. 2 between the edges of the casing interposed seal member, on the outside of the co-fastening connections, bypass seal portion for sealing bypasses the outer co clamping connection portion is provided, the The sealing member is Ru is disposed in the seal groove which is recessed in at least one of the first and second casings at times seal.

  In the invention according to claim 2, in the casing structure according to claim 1, at least one of the edge portions of the first and second casings is provided with a seal groove via the bypass seal portion, The seal member was disposed in the seal groove.

According to a third aspect of the present invention, in the casing structure according to the second aspect, the seal groove is formed over the entire circumference of the edge portion.
According to a fourth aspect of the present invention, in the casing structure according to any one of the first to third aspects, the first and second casings are fixed to a motor body that drives a rotary shaft, and the rotary shaft rotates. And a cover for closing an opening of the gear housing.

According to a fifth aspect of the present invention, in the casing structure according to the fourth aspect, the gear housing is made of a conductive material, the cover is made of an electrically insulating material, and the cover is fastened together with the ground terminal. A recess for terminal for arranging the connecting portion is formed, and the seal groove is formed in the bypass seal portion provided so as to bypass the outside of the recess for terminal.
The invention described in claim 6 is summarized in the casing structure according to claim 4 or 5 and a motor including the motor body.
(Function)
According to invention of Claim 1, each edge part of the 1st and 2nd casing is match | combined, and a fastening member is penetrated by the to-be-fastened part formed in the predetermined location of the edge part, and the 1st and 2nd The casings are fastened and fixed to each other. The first and second casings contain electrical parts including a ground terminal, and the joint fastening portions formed on the ground terminal are both edge portions by fastening and fastening the first and second casings with fastening members. By being clamped together and fastened together, it is electrically connected to at least one of the first and second casings. A seal member is interposed between both edge portions of the first and second casings, and a bypass seal portion that bypasses and seals the outside of the joint fastening connection portion is provided outside the joint fastening connection portion. Therefore, the seal member is continuously arranged in the vicinity of the fastened portion, without being interrupted, and water (liquid) is prevented from entering from the outside into the inner side through the gap between both edges, and to the joint fastening connection portion. Inundation and associated corrosion is prevented. Further, since the seal member does not get on the joint fastening connection portion, a surface area that can be contacted by the joint fastening connection portion is ensured, and an electrical connection failure of the ground terminal is prevented.

  According to the second aspect of the present invention, the seal groove is provided in the at least one edge portion of the first and second casings via the detour seal portion, and the seal member is disposed in the seal groove. Therefore, the predetermined thickness of the seal member can be ensured. Thereby, the characteristic (elasticity) of the sealing member can be effectively used and brought into close contact, and the waterproofness can be enhanced while absorbing the dimensional error between both edges. Further, for example, when a melted seal member is applied and provided using a nozzle, the nozzle can be guided by the seal groove, and the seal member can be easily disposed.

According to the third aspect of the present invention, the seal groove is formed over the entire circumference of the edge portion, and the seal member is disposed without interruption over the entire circumference, so that the waterproofness is further improved. The
According to the fourth aspect of the invention, the waterproofness can be improved while ensuring the reliability of the electrical connection of the ground terminal in the gear housing.

According to the sixth aspect of the present invention, it is possible to provide a motor capable of improving the waterproofness while ensuring the reliability of the electrical connection of the ground terminal in the gear housing.

According to invention of Claims 1-5, the casing structure which can improve waterproofness can be provided, ensuring the reliability of the electrical connection of an earth terminal.
According to the sixth aspect of the present invention, it is possible to provide a motor capable of improving the waterproofness while ensuring the reliability of the electrical connection of the ground terminal.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment in which the invention is embodied in a motor for a wiper device of a vehicle wiper device will be described with reference to FIGS.
As shown in FIG. 1, a wiper device 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) as a gear housing, a worm wheel 12 (see FIG. 1), a housing cover 13 (see FIG. 4) as a cover, and a unit plate 14 (see FIG. 6). And a rotating body 15 (see FIG. 3). In the present embodiment, the housing 11 and the housing cover 13 constitute first and second casings, and the worm 8 and the worm wheel 12 constitute a reduction gear.

  The housing 11 is made of a metal (in this embodiment, an aluminum alloy) made of a conductive material. As shown in FIG. 2, the housing 11 is formed with a worm housing recess 11a for housing the worm 8 and a wheel housing recess 11b communicating with the worm housing recess 11a.

  Further, in the housing 11, a fastening hole 11 d (see FIG. 14) as a fastened portion is recessed at a predetermined portion of the housing side edge portion 11 c as the standing edge portion. Further, the housing side edge portion 11c has a mating plane on the housing side as a bypass portion so as to bypass the outer side of the fastening hole 11d (outside of the housing 11) in the portion to be fastened, that is, the fastening hole 11d. A detour part 11e is formed. The fastening hole 11d is formed with a large diameter portion 11f (see FIG. 14) having a larger diameter than the bottom side on the opening side.

  Further, as shown in FIG. 2, the housing 11 has a wall 11g to be engaged so as to short-circuit a part of the housing side edge portion 11c and to constitute a part of the inner wall constituting the wheel receiving recess 11b. Is erected at the same height as the housing side edge portion 11c. The housing side edge portion 11c constitutes most of the inner wall constituting the worm accommodating recess 11a and the wheel accommodating recess 11b together with the engaged wall 11g. Further, the housing 11 is formed with a pair of sandwiching connection portions 11h formed at a predetermined interval Za (see FIG. 9C) described later. The sandwiching and connecting portion 11h of the present embodiment is erected at the same height as the housing side edge portion 11c so as to extend in parallel from the engaged wall 11g toward the outside of the wheel receiving recess 11b.

  And the worm 8 is accommodated in the worm accommodation recessed part 11a, and the worm wheel 12 meshed with the worm 8 is accommodated rotatably in the wheel accommodation recessed part 11b. 2 shows the housing 11 from which the housing cover 13 is removed and the worm 8 and the worm wheel 12 are not disposed. An output shaft (not shown) fixed so as to rotate integrally with the worm wheel 12 passes through a through hole 11 i formed in the center of the housing 11 and protrudes to the outside. The output shaft of the worm wheel is connected to a wiper arm (wiper blade) via a link mechanism (not shown).

  As shown in FIG. 4, the housing cover 13 is made of a resin material (made of resin), has a substantially plate shape, and a cover side edge portion 13 a as an edge portion thereof is aligned with the housing side edge portion 11 c. The housing 11 (such as the worm housing recess 11a and the wheel housing recess 11b) is formed in a shape capable of closing the opening. The housing cover 13 is formed with a unit accommodating recess 13b for accommodating the unit plate 14. The housing cover 13 has a rotating shaft 7 (on the lower left side in FIG. 4) corresponding to the wheel receiving recess 11b (see FIG. 2) opposite to the side on which the motor body 2 is fixed. A connector housing part 13c is formed extending in the direction of the axis β1 inclined toward the worm wheel 12 with respect to the direction of the axis α of the worm 8).

  The connector housing portion 13c communicates with the bottom of the unit housing recess 13b, and is orthogonal to the closing direction of the housing cover 13 (in FIG. 2, the axial direction of the output shaft (not shown) inserted through the through hole 11i) (in FIG. 4). The external connector (not shown) extends in a cylindrical shape in a diagonally downward left direction, that is, an axis β2 direction in a connector pin portion lead-out direction (sliding direction of the unit plate 14) to be described later. A part of the inner peripheral wall of the unit housing recess 13b is formed with a first and second guide wall 13d, which will be described later, formed long in parallel with the extending direction of the connector housing part 13c (the axis β2 direction in FIG. 4). , 13e. A cover-side temporary holding portion 13f is formed on the housing cover 13 on the side (right side in FIG. 4) to which the motor body 2 is fixed. As shown in FIG. 5, the cover-side temporary holding portion 13 f has a substantially U-shaped cross section in the direction perpendicular to the extending direction of the connector housing portion 13 c (in the direction of the axis β <b> 2 in FIG. 4).

  Further, a fastening hole 13g as a fastened part and a hole is formed at a predetermined position corresponding to the fastening hole 11d of the cover side edge part 13a. The cover side edge 13a is formed with a terminal recess 13h that extends from the inside and surrounds the fastening hole 13g. Further, a cover side bypass portion 13i as a bypass portion is formed in the cover side edge portion 13a so as to bypass the outside (external side) of the fastening hole 13g (terminal recess 13h). Further, a seal groove 13j is recessed in the cover side edge portion 13a. In the present embodiment, the seal groove 13j is formed over the entire circumference of the cover side edge portion 13a including the cover side detour portion 13i. A seal member 16 is disposed in the seal groove 13j (see FIG. 14). The seal member 16 of the present embodiment is a butyl rubber-based seal material, and a melted material is applied (injected) to the seal groove 13j using a nozzle and cooled as shown in FIG. It arrange | positions so that a part may swell from the groove | channel 13j. A portion of the seal member 16 that passes through (passes through) the cover-side bypass portion 13i is a seal-side bypass portion 16a.

  Further, as shown in FIG. 14, a waterproof lip portion 13k protruding in the fastening direction so as to surround the fastening hole 13g is formed on the periphery of the fastening hole 13g in the housing cover 13. Specifically, the housing cover 13 has a diameter larger than that of the fastening hole 13g around the fastening hole 13g on the opposite side (upper side in FIG. 14) of the cover side edge part 13a aligned with the housing side edge part 11c. A recessed head receiving recess 13l is formed. And the waterproof lip part 13k which protruded in the fastening direction (up-down direction in FIG. 14) was formed in the bottom part of the head accommodating recessed part 13l so that this fastening hole 13g might be surrounded on the periphery of the fastening hole 13g. The waterproof lip portion 13k of the present embodiment has a triangular shape whose radial width decreases as the cross-section approaches the tip (upper end in FIG. 14) before assembly (before crushing), which will be described later. Yes.

  The unit plate 14 is made of an electrically insulating material (resin material) and, as shown in FIG. 6, is formed in a substantially rectangular parallelepiped shape corresponding to the unit housing recess 13b, to which various electric circuit components described later are fixed.

  The unit plate 14 is provided with a rotation support portion for rotatably supporting the rotating body 15. The rotation support portion of the present embodiment is offset in the longitudinal direction (downward in FIG. 6) from the central portion of the unit plate 14 in the longitudinal direction (left-right direction in FIG. 6 and in the axis γ direction). As shown in FIGS. 6 and 12, the support shaft 14a is provided upright and the peripheral wall portion 14b is formed so as to surround the support shaft 14a.

  In the present embodiment, the first surface S1 which is the surface of one end of the unit plate 14 in the short direction (the upper end in FIG. 6) and the other end in the short direction (the side end where the peripheral wall portion 14b is formed). Thus, the second surface S2 which is the surface of the lower end in FIG. 6 is formed in parallel. In the present embodiment, the first surface S1 and the second surface S2 are set parallel to the longitudinal axis γ of the unit plate 14. The distance between the first surface S1 and the second surface S2 is set to be the same as the distance between the first guide wall 13d and the second guide wall 13e in the unit housing recess 13b of the housing cover 13. The length of the first surface S1 is set shorter than the length of the first guide wall 13d, and the length of the second surface S2 is set shorter than the length of the second guide wall 13e. That is, as shown in FIGS. 10 and 11, the unit plate 14 is accommodated in the unit accommodating recess 13b and the first surface S1 and the first guide wall 13d are in contact with each other and the second surface S2 and the second surface S2 are in contact with each other. Two guide walls 13e are formed so as to contact each other. At this time, in the present embodiment, the longitudinal axis γ of the unit plate 14 and the axial line β2 in the extending formation direction of the connector housing portion 13c are arranged in parallel. 10 and 11, the unit plate 14 is guided (along) along the first and second guide walls 13d and 13e while being accommodated in the unit accommodating recess 13b. It is slidable in a direction orthogonal to the closing direction (in the direction of the axis β2 in the extending direction of the connector housing portion 13c).

  The unit plate 14 temporarily holds the unit plate 14 and the housing cover 13 by engaging with the cover-side temporary holding portion 13f at the guide end position by the first and second guide walls 13d and 13e. The unit side temporary holding part 14c for doing this is provided. Moreover, the connector housing part 13c side edge part of the unit plate 14 is formed so that it may be inserted by the said connector housing part 13c in the said guidance terminal position. Therefore, when the unit plate 14 is guided by the first and second guide walls 13d and 13e and slid to the guide end position, the movement of the unit plate 14 in each direction is restricted so that the housing plate 13 does not accidentally drop off. And temporarily held (temporarily fixed).

  The unit plate 14 is engaged with the engaged wall 11g (see FIG. 2) of the housing 11 by closing the opening of the housing 11 with the housing cover 13 on which the unit plate 14 is held (temporarily held). In addition, an engagement wall 14d that prevents the movement of the unit plate 14 in the guide direction is provided. The engaging walls 14d are formed as a pair (partially intermittently) so as to sandwich the engaged wall 11g when the housing cover 13 closes the opening of the housing 11. Therefore, when the housing cover 13 is assembled to the housing 11, the unit plate 14 is held with its movement in the guide direction (in the obliquely downward left direction in FIG. 11 and in the direction of the axis β 2) firmly regulated. .

  As shown in FIGS. 6 and 7, the electric circuit component according to the present embodiment includes first and second power supply side terminals 21 and 22, a first fixed contact terminal 23 as a ground terminal, second and third fixed terminals. It includes contact terminals 24, 25, first and second capacitors 26, 27, and first to third fixed contact members 28-30. And the said electric circuit components 21-27 except the 1st-3rd fixed contact members 28-30 are arrange | positioned at the surface side facing the housing cover 13 of the said unit plate 14. As shown in FIG.

  Specifically, the first and second power supply side terminals 21 and 22 are external connectors in which one end is connected to a power supply brush (not shown) provided in the motor body 2 and the other end is fitted to the connector housing portion 13c. It is connected to the terminal.

  As shown in FIG. 8, the first power supply side terminal 21 of the present embodiment is formed of a flat metal plate, and is connected to the motor connection portion 21a that is the one end and the connector housing portion 13c that is the other end. Connector pin portion 21b led out to the connector, and lead portion 21c for connecting motor connecting portion 21a and connector pin portion 21b. On the connector pin portion 21b (other end) side of the first power supply side terminal 21, as shown in FIGS. 8A and 8B, a crank-shaped crank portion 21d engaged with a part of the unit plate 14 is provided. It is bent. In addition, a slit portion 21e is formed in the lead portion 21c of the first power supply side terminal 21 so that the terminal of the noise prevention element (first and second capacitors 26, 27) can be clamped (fixed). . In the present embodiment, the slit portion 21e is formed by forming a cut from the tip of the standing portion 21f raised by bending with respect to the plane of the lead portion 21c. In addition, spike portions 21g that protrude in the width direction of the flat metal plate are formed on both ends of the first power supply side terminal 21, respectively. The second power supply side terminal 22 has substantially the same configuration as the first power supply side terminal 21 (having a motor connection portion 22a, a connector pin portion 22b, a lead portion 22c, a crank portion, a slit portion 22e, and a spike portion. Therefore, detailed drawings are omitted.

  The first to third fixed contact terminals 23 to 25 are connected to terminals of an external connector, one end of which is arranged in the middle part of the unit plate 14 and the other end is fitted to the connector housing part 13c. The first to third fixed contact terminals 23 to 25 of the present embodiment are formed of a flat metal plate, and are the fixed contact connecting portions 23a to 25a (see FIG. 6) which are the one ends and the other ends. Connector pin portions 23b to 25b led out into the connector housing portion 13c and lead portions 23c to 25c for connecting them are provided.

  The first fixed contact terminal 23 as an earth terminal extends from the lead portion 23c to positions corresponding to the slit portions 21e and 22e of the first and second power supply side terminals 21 and 22 (see FIG. 7). A portion 23d is formed, and the extended portion 23d is formed with a slit portion 23e similar to the slit portions 21e and 22e.

  Further, as shown in FIG. 9, the first fixed contact terminal 23 is formed with a preliminary connection portion 23f that extends from the extended portion 23d through the unit plate 14 so as to protrude from the surface side not facing the housing cover 13. Has been. A pinched U-shaped portion 23g having elasticity is formed at the tip of the preliminary connecting portion 23f by bending it into a substantially U shape (see FIG. 9B). The sandwiched U-shaped portion 23g is disposed at a position corresponding to the sandwiched connecting portion 11h (see FIG. 2). The pair of sandwiching connection portions 11h (see FIG. 9C) is formed with a predetermined interval Za smaller than the maximum interval Zb between the two sides of the sandwiched U-shaped portion 23g that is not elastically deformed.

  Further, the first fixed contact terminal 23 is formed with a joint fastening portion 23h that extends from the lead portion 23c and is formed so as to fit into the terminal recess 13h (see FIGS. 10, 11, and 13). . That is, the joint fastening connection portion 23h is formed in a disk shape that is a shape surrounding the fastening hole 13g. A cylindrical portion 23j that can be fitted into the large-diameter portion 11f (see FIG. 14) is erected by burring from the inner peripheral edge of the central hole 23i. The joint fastening connection portion 23h is set so as to be flush with the cover side edge portion 13a where the terminal recess portion 13h is not formed (except for the cylinder portion 23j) in a state of being fitted in the terminal recess portion 13h. The

  On the other hand, on the surface of the unit plate 14 facing the housing cover 13, as shown in FIG. 7, the first and second power source terminals 21 and 22 and the first to third fixed contact terminals 23 to 25 are accommodated. A possible housing recess 14f is formed. The first and second power supply side terminals 21 and 22 and the first to third fixed contact terminals 23 to 25 are inserted into the housing recess 14f, and the spike portions 21g and the like engage with the inner wall of the housing recess 14f. It is held by (fitting). In this state, the connector pin portions 21b to 25b of the first and second power supply side terminals 21 and 22 and the first to third fixed contact terminals 23 to 25 are connected to the connector housing portion 13c side end of the unit plate 14. Protruding.

  The first and second capacitors 26 and 27 are for removing (attenuating) noise generated on the power supply brush side. On the side of the unit plate 14 facing the housing cover 13, as shown in FIG. 7, a noise prevention element accommodating recess 14 g capable of accommodating the first and second capacitors 26 and 27 is formed. In the present embodiment, three noise prevention element accommodating recesses 14g each capable of accommodating a capacitor are formed. When the first and second capacitors 26 and 27 are inserted into the two noise preventing element accommodating recesses 14g, the terminals thereof are the slit portions 21e and 22e of the first and second power supply side terminals 21 and 22, and the ground. The first fixed contact terminal 23 as a terminal is held by being sandwiched by the slit portion 23e of the first fixed contact terminal 23. In the present embodiment, three noise prevention element accommodating recesses 14g are formed, but the motor 1 is configured to use only (two) first and second capacitors 26 and 27. That is, the motor 1 of the present embodiment is configured to be compatible with a specification having three capacitors.

  As shown in FIG. 6, the first to third fixed contact members 28 to 30 are formed of a flat metal plate and are one end, and are fixed contact connecting portions of the first to third fixed contact terminals 23 to 25. It consists of support parts 28a-30a connected to 23a-25a, contact parts 28b-30b which are the other ends, and lever parts 28c-30c which connect them. The lever portions 28 c to 30 c have elasticity and are formed to extend obliquely in a direction protruding from the plane of the unit plate 14. The first to third fixed contact members 28 to 30 are arranged in parallel to each other, and the contact portions 28b to 30b are arranged so as to be aligned on a straight line extending in the radial direction from the support shaft 14a.

  First, as shown in FIG. 10, the unit plate 14 configured as described above is inserted into the unit receiving recess 13b of the housing cover 13 from above (in the closing direction, from the front side in FIG. 10), It is inserted and placed on the inner surface of the housing cover 13. At this time, the first and second surfaces S1, S2 of the unit plate 14 are in contact with the first and second guide walls 13d, 13e of the housing cover 13.

  Next, the unit plate 14 is guided (along) by the first and second guide walls 13d and 13e (in the direction perpendicular to the closing direction of the housing cover 13 (in FIG. 10, diagonally downward to the left) and the axis β2 Direction). When the unit plate 14 is moved to the guide end position (position shown in FIG. 11), the unit plate 14 is temporarily held by the housing cover 13 as described above. At this time, the connector pin portions 21b to 25b of the first and second power supply side terminals 21 and 22 and the first to third fixed contact terminals 23 to 25 are led out into the connector housing portion 13c.

  As shown in FIG. 12, the rotating body 15 is rotatably supported by the rotation support portion (support shaft 14a and peripheral wall portion 14b) of the unit plate 14. Specifically, as shown in FIG. 3 and FIG. 12, the rotating body 15 has a substantially disk-shaped disk portion 15a and a substantially bottomed cylindrical shape protruding from the center of the disk portion 15a, and a shaft hole 15b is formed at the center of the bottom portion. Shaft portion 15c. A movable contact 31 (shown by a broken line in FIG. 3) having a predetermined pattern is fixed to one side surface 15d (surface on the side from which the shaft portion 15c projects) of the disk portion 15a. Then, as shown in FIG. 12, the rotating body 15 is inserted into the shaft hole 15b and the cylindrical portion of the shaft portion 15c is fitted into the peripheral wall portion 14b. A member (such as a washer) 32 is fixed and supported rotatably. At this time, the contact portions 28b to 30b of the first to third fixed contact members 28 to 30 are pressed and brought into contact with one side surface 15d (movable contact 31) of the disk portion 15a by the elasticity of the lever portions 28c to 30c. The

  The housing cover 13 (see FIG. 3) to which the unit plate 14 and the rotating body 15 are fixed as described above is fixed to the housing 11 and closes the openings of the housing 11 (the worm accommodating recess 11a and the wheel accommodating recess 11b). .

  Specifically, the cover side edge portion 13a is aligned with the housing side edge portion 11c, and a screw 41 (see FIGS. 1, 13, and 14) as a fastening member that passes through the fastening hole 13g and is screwed into the fastening hole 11d. The housing 11 and the housing cover 13 are fastened and fixed. At this time, as shown in FIG. 13, the joint connection portion 23h of the first fixed contact terminal 23 has a housing side edge portion 11c and a cover side edge portion 13a (more specifically, a terminal recess portion 13h in a state of surrounding the screw 41). ). At this time, the cylindrical portion 23j is fitted in the large diameter portion 11f (see FIG. 14), and the tip thereof is brought into contact with the bottom portion of the large diameter portion 11f. Further, at this time, as shown in FIG. 9C, the sandwiched U-shaped portion 23g is inserted into the pair of sandwiching connection portions 11h while being bent in the direction in which the two sides approach each other. The two sides are clamped (pressed contact) by the pair of clamping connection portions 11h. As a result, the first fixed contact terminal 23 as an earth terminal is electrically connected to the housing 11.

  Here, the shape of the screw 41, each dimension of the portion to be fastened, and the like will be described in detail with reference to FIG. The screw 41 includes a head portion 41b, a step portion 41c extending from the seating surface 41a of the head portion 41b, and a male screw portion 41d extending further from the step portion 41c and having a smaller diameter than the step portion 41c. The diameter Xa of the head 41b (seat surface 41a) of the screw 41 is set smaller than the diameter Xb of the head accommodating recess 13l (Xb> Xa). Further, the diameter Xc of the waterproof lip 13k is set smaller than the diameter Xa of the head 41b (seat surface 41a) of the screw 41 (Xa> Xc). The diameter Xd of the fastening hole 13g is set to be smaller than the diameter Xc of the waterproof lip portion 13k and slightly larger than the diameter Xe of the step portion 41c (Xc> Xd> Xe). Further, the diameter (inner diameter of the cylindrical portion 23j) Xf of the central hole 23i of the joint fastening connection portion 23h is smaller than the diameter Xd of the fastening hole 13g and slightly larger than the diameter Xg of the fastening hole 11d (excluding the large diameter portion 11f). It is set (Xd> Xf> Xg). Further, the diameter Xg of the fastening hole 11d is set such that a female thread is formed while the inner wall is being scraped when the male thread portion 41d is screwed. Further, the length Ya of the stepped portion 41c in the fastening direction (vertical direction in FIG. 14) is the maximum thickness which is the thickness of the housing cover 13 including the waterproof lip portion 13k before the waterproof lip portion 13k is crushed. It is smaller than Yb and is set to be equal to or greater than the minimum thickness Yc which is the thickness of the housing cover 13 excluding the waterproof lip 13k (Yb> Ya ≧ Yc). The length obtained by adding the length Yd in the fastening direction of the fastening hole 11d and the plate thickness Ye of the joint fastening portion 23h is set to be larger than the length Yf of the male screw portion 41d ((Yd + Ye)> Yf). .

  Therefore, when the screw 41 is tightened, if the tip of the stepped portion 41c is brought into contact with the housing 11 (housing side edge portion 11c) via the joint tightening connection portion 23h, further tightening is restricted. Then, as described above, when fastened, the waterproof lip 13k is directly crushed by the seat surface 41a of the screw 41. Thereby, the space (gap) from the outside to the joint fastening connection portion 23h is partitioned by the waterproof lip portion 13k. Therefore, it is possible to prevent water (liquid) from entering the inside (on the side of the joint fastening portion 23h) from the outside through the fastening hole 13g.

  Further, at this time, the seal member 16 (see FIG. 14) including the seal-side bypass portion 16a disposed so as to partially rise from the seal groove 13j has a cover-side edge portion 13a (seal groove 13j) and a housing-side edge portion. It is compressed by 11c (see FIG. 13) and pinched. Therefore, it is possible to prevent water (liquid) from entering the inner side (on the side of the joint connection portion 23h) through the space (gap) between the housing side edge portion 11c and the cover side edge portion 13a. In the present embodiment, the housing-side bypass portion 11e (see FIG. 2), the cover-side bypass portion 13i (see FIG. 3), and the seal-side bypass portion 16a are provided outside the joint fastening connection portion 23h. A detour seal portion that detours and seals the outside of the connection portion 23h is configured.

  At this time, the rotating body 15 includes a connecting projection 15f (see FIG. 3) provided on the other side surface 15e (the surface facing the worm wheel 12) and a connection (not shown) provided on the worm wheel 12. Engagement of the convex portion causes drive connection to the worm wheel 12 (output shaft) so as to be integrally rotatable. Further, when the male thread portion 41d is screwed into the fastening hole 11d, the inner wall of the fastening hole 11d is scraped, but the shavings K (see FIG. 13) has a dimensional relationship of (Yd + Ye)> Yf. Since a space portion is generated between the portion 41d and the bottom portion of the fastening hole 11d, the space portion (bottom portion) accumulates.

Next, the electrical wiring of the motor 1 assembled in the vehicle will be described with reference to FIG.
The first and second power supply side terminals 21 and 22 have motor connection portions 21a and 22a connected to power supply brushes (for high speed and low speed) of the motor main body 2, respectively, and connector pin portions 21b and 22b for vehicle driving. Each is connected to a change-over switch 51 provided in the seat. In the present embodiment, a choke coil C disposed on a brush holder member (not shown) of the motor body 2 is connected in series between the motor connection portion 22a of the second power supply side terminal 22 and the low-speed power supply brush. It is connected.

  The connector pin portion 23b of the first fixed contact terminal 23 is connected to the ground. The ground brush of the motor body 2 is connected to the ground. Connector pin portions 24b and 25b of the second and third fixed contact terminals 24 and 25 are connected to the changeover switch 51, respectively. The connector pin portion 25b of the third fixed contact terminal 25 is connected to a power source E (vehicle battery).

  The changeover switch 51 has a stop position P1 for stopping the motor 1, a low speed position P2 for operating the motor 1 at a low speed, and a high speed position P3 for operating the motor 1 at a high speed. The changeover switch 51 connects the second power supply side terminal 22 and the second fixed contact terminal 24 at the stop position P1. The changeover switch 51 connects the second power supply side terminal 22 to the power supply E and the third fixed contact terminal 25 at the low speed position P2. The changeover switch 51 connects the first power supply side terminal 21 to the power supply E and the third fixed contact terminal 25 at the high speed position P3.

  In the motor 1 configured in this way, when the changeover switch 51 is switched to the low speed position P2, the low-speed power supply brush is connected to the power source E. Therefore, the motor 1 is related to the angular position of the movable contact 31 described later. Operates at low speed. That is, the worm wheel 12 and the rotating body 15 rotate at a low speed. Therefore, the wiper arm (wiper blade) is wiped (reciprocated) at a low speed via the link mechanism or the like.

  When the changeover switch 51 is switched to the high-speed position P3, the high-speed power supply brush is connected to the power source E, so that the motor 1 operates at high speed regardless of the angular position of the movable contact 31 described later. That is, the worm wheel 12 and the rotating body 15 rotate at high speed. Therefore, the wiper arm (wiper blade) is wiped (reciprocated) at high speed via the link mechanism or the like.

  When the changeover switch 51 is changed from the low speed position P2 or the high speed position P3 to the stop position P1, the direct connection with the power source E via the changeover switch 51 of the low speed or high speed power supply brush is cut off. The low-speed power supply brush (second power supply side terminal 22) and the second fixed contact terminal 24 are connected. At this time, if the movable contact 31 (worm wheel 12) is at a predetermined angular position (position where the contact portions 28b and 29b are connected), the second fixed contact terminal 24 connected to the low-speed power feeding brush The motor 1 is stopped because it is connected to the ground brush and the ground via the one fixed contact terminal 23 (see FIG. 15). At this time, if the movable contact 31 (worm wheel 12) is not at the predetermined angular position but is in a position to connect the contact portions 29b and 30b, the second fixed contact terminal connected to the low-speed power supply brush. 24 is connected to a power source E. Therefore, the motor 1 operates at a low speed. When the movable contact 31 (worm wheel 12) rotates to the predetermined angular position, the second fixed contact terminal 24 connected to the low-speed power supply brush passes through the first fixed contact terminal 23 to the ground brush. Since the motor 1 is connected to the ground (see FIG. 15), the motor 1 stops. When the movable contact 31 (worm wheel 12) is at the predetermined angular position (when in the state shown in FIG. 15), the wiper arm (wiper blade) is at a predetermined stop position along the lower end of the front window. Is set to Therefore, when the changeover switch 51 is switched from the low speed position P2 or the high speed position P3 to the stop position P1, the wiper arm (wiper blade) is automatically stopped after moving to a predetermined stop position along the lower end of the front window.

Next, characteristic effects of the above embodiment will be described below.
(1) A housing-side bypass portion 11e (see FIG. 2) that bypasses the outside of the fastening hole 11d is formed in the housing-side edge portion 11c, and a cover-side bypass that bypasses the outside of the fastening hole 13g is formed in the cover-side edge portion 13a. Part 13i (see FIG. 3) is formed. The seal member 16 interposed between the housing side edge portion 11c and the cover side edge portion 13a has a seal side bypass portion 16a passing through the housing side bypass portion 11e and the cover side bypass portion 13i. That is, a detour seal portion (housing side detour portion 11e, cover side detour portion 13i, and seal side detour portion 16a) is provided outside the co-tightening connection portion 23h so as to bypass and seal the outer side of the co-tightening connection portion 23h. It is done. Therefore, the seal member 16 is not interrupted at the fastening hole 11d and the fastening hole 13g, and the inside (both sides) is connected from the outside through the space between the housing side edge 11c and the cover side edge 13a (between the fitting planes). Water (liquid) is prevented from entering the tightening connection portion 23h side. Therefore, the corrosion accompanying the water immersion to the joint fastening joint part 23h fastened is prevented. Further, since the seal member 16 does not ride on the joint fastening connection portion 23h, a surface area that can be contacted by the joint fastening connection portion 23h is ensured, and poor electrical connection of the first fixed contact terminal 23 (earth terminal) is prevented. As a result, the waterproofness of the housing 11 and the housing cover 13 can be improved while ensuring the reliability of the electrical connection of the first fixed contact terminal 23 (earth terminal).

  (2) The seal member 16 is disposed in a seal groove 13j that is recessed in the cover side edge portion 13a. Therefore, a predetermined thickness of the seal member 16 can be ensured. As a result, the characteristics (elasticity) of the seal member 16, specifically, the compression elastic performance of the seal member 16 itself can be maintained at a predetermined level, so that the housing side edge portion 11c and the cover side edge portion 13a are brought into close contact with each other. Thus, the waterproofness can be enhanced while absorbing the dimensional error between the two. Further, for example, when the melted seal member 16 is applied using a nozzle, the nozzle can be guided by the seal groove 13j, and the seal member 16 can be easily disposed.

  (3) The seal groove 13j is formed over the entire circumference of the cover side edge portion 13a including the cover side bypass portion 13i, and the seal member 16 is disposed without interruption over the entire circumference, so that the waterproof property is provided. Further improvement.

  (4) At the periphery of the fastening hole 13g in the housing cover 13, a waterproof lip portion 13k (see FIG. 14) projecting in the fastening direction so as to surround the fastening hole 13g is formed. It is crushed (directly) by the seating surface 41a. Therefore, water (liquid) is prevented from entering from the fastening hole 13g to the inside (on the side of the joint fastening portion 23h) by the crushed waterproof lip 13k (see FIG. 13). Thereby, waterproofing can be improved without performing a work of a separate process, while making a simple shape without requiring a separate member. Further, since the corrosion of the joint fastening connection portion 23h is prevented, the reliability (durability) of the electrical connection is improved.

  (5) Since the diameter Xc of the waterproof lip portion 13k is set smaller than the diameter Xa of the head portion 41b (seat surface 41a) of the screw 41, the waterproof lip portion 13k is viewed from the fastening direction as the head portion 41b (seat surface 41a). ), The pressure from the seat surface 41a can be reliably transmitted to the waterproof lip portion 13k, and the waterproof lip portion 13k can be reliably crushed.

  (6) The length Ya in the fastening direction (vertical direction in FIG. 14) of the stepped portion 41c is the maximum thickness of the housing cover 13 including the waterproof lip portion 13k before the waterproof lip portion 13k is crushed. It is smaller than the thickness Yb and is set to be equal to or greater than the minimum thickness Yc that is the thickness of the housing cover 13 excluding the waterproof lip 13k. Therefore, when the screw 41 is tightened, if the tip of the stepped portion 41c is brought into contact with the housing 11 (housing side edge portion 11c) via the joint tightening connection portion 23h and further tightening is restricted, the waterproof lip portion 13k. Is surely crushed. Further, the housing cover 13 is prevented from being damaged (collapsed) due to overtightening of the screw 41 (except for the waterproof lip 13k). Further, since the waterproof lip 13k is formed on the resin housing cover 13, it is easily crushed. Further, since the housing 11 that restricts the movement of the step portion 41c (via the joint connection portion 23h) is made of metal, the movement of the step portion 41c is strongly restricted as compared with the case where it is restricted by a resin one. And damage due to overtightening is further prevented.

  (7) The waterproof lip portion 13k is crushed because the cross-section of the waterproof lip portion 13k has a triangular width that decreases toward the tip (upper end in FIG. 14) before assembly (before being crushed). In this case, the waterproof lip 13k is prevented from falling from the proximal end side, and the waterproof lip 13k can be gradually crushed from the distal end side.

  (8) The first fixed contact terminal 23 as an earth terminal has a preliminary connection portion 23f protruding from a position different from the joint fastening connection portion 23h, and is bent into a substantially U shape at the tip of the preliminary connection portion 23f. Thus, the sandwiched U-shaped portion 23g having elasticity is formed. The housing 11 has a pair of sandwiching connection portions 11h formed at a predetermined interval Za smaller than the maximum interval Zb between the two sides of the sandwiched U-shaped portion 23g that is not elastically deformed. It is clamped by a pair of clamping connection parts 11h. In this way, the first fixed contact terminal 23 is connected to the sandwiched connection portion 11h and the sandwiched U-shaped portion 23g of the spare connection portion 23f separately from the joint fastening portion 23h. The property is further improved. Moreover, for example, in the configuration in which the preliminary connection portion 23f is a simple pressing piece and is in press contact with the housing (conductive material) only in one direction, the pressing piece is plastically deformed from the root to the other direction, or the position of the root is Due to misalignment during assembly, the pressing force tends to be weak, and the reliability of electrical connection is low. On the other hand, if it carries out as mentioned above, the to-be-clamped U-shaped part 23g will be bent in a substantially U shape, and the two sides are pinched | interposed into a pair of clamping connection part 11h (each pressing contact) by own elasticity. For example, even if the position of the base of the spare connection portion 23f is shifted due to assembly, poor electrical connection is prevented.

The above embodiment may be modified as follows.
In the above embodiment, the seal groove 13j is recessed in the cover side edge portion 13a, and the seal member 16 is disposed in the seal groove 13j. However, the seal groove 13j is not formed, but on the plane. The seal member 16 may be disposed. Further, the seal groove may be provided in the housing side edge portion 11c regardless of whether or not the seal groove 13j is provided in the cover side edge portion 13a.

  In the above embodiment, the seal member 16 is continuously arranged without interruption over the entire circumference of the housing side edge portion 11c including the housing side bypass portion 11e and the cover side bypass portion 13i and the cover side edge portion 13a. However, what is necessary is just to seal in the fastening site | part which is arrange | positioned so that the housing side bypass part 11e and the cover side bypass part 13i may be included at least, and the co-clamping connection part 23h is co-clamped. Of course, the seal groove 13j may have a partially cut shape.

In the above embodiment, the waterproof lip portion 13k is formed on the periphery of the fastening hole 13g in the housing cover 13, but the waterproof lip portion 13k may not be formed.
In the above embodiment, the first fixed contact terminal 23 as the ground terminal has the spare connection portion 23f, and the sandwiched U-shaped portion 23g is formed at the tip of the spare connection portion 23f. The preliminary connection portion 23f may be a simple pressing piece that is pressed into contact with the housing (conductive material) only in one direction, or the preliminary connection portion 23f may be omitted.

In the above embodiment, the fastening hole 11d as the fastened portion is formed at a predetermined position of the housing side edge portion 11c. However, the fastening hole may be changed to a fastening hole penetrating the fastening hole 11d.
In the above embodiment, the waterproof lip 13k has a triangular shape whose radial width decreases as the cross-section approaches the tip (upper end in FIG. 14) before assembly (before being crushed). However, other shapes (for example, a square or semicircular cross section) may be used.

  In the above embodiment, the sealing member 16 is a butyl rubber-based sealing material, and a melted material is applied (injected) to the sealing groove 13j using a nozzle and cooled as shown in FIG. Although it arrange | positioned so that it may rise partially from the groove | channel 13j, if it arrange | positions similarly, it may be changed into another sealing material, and may be arrange | positioned by another method. For example, a sealing material (having rigidity that can be handled in that shape) formed in a shape corresponding to the seal groove 13j in advance may be assembled and fitted in the seal groove 13j.

  In the above-described embodiment, the wiper device motor is embodied. However, the wiper device motor may be embodied in other things (such as a power window motor or an actuator case incorporating a motor that does not accommodate a reduction gear). Further, the housing 11 and the housing cover 13 (first and second casings) are of other shapes as long as the edges are aligned and the edges are fastened and fixed by the fastening member (screw 41). (For example, you may change into the 1st and 2nd casing in which the edge part to match | combined stood upright). Of course, you may change suitably the electrical component accommodated in a 1st and 2nd casing.

The technical idea that can be grasped from the above embodiments will be described below together with the effects thereof.
(B) in the casing structure, as in a peripheral edge of the object to be fastened portion in at least one of said first and second casing between the external ranging in the co-fastening connection portion, to surround the fastened portion waterproof lip portion protruding fastening direction is formed, the waterproof lip, characterized in that it is directly or indirectly collapsed by the seat surface of the fastening member. If it does in this way, it will be prevented that water (liquid) permeates into an inner side and a joint fastening connection part from the hole as a fastening part by the crushed waterproofing lip part. Thereby, waterproofing can be improved without performing a work of a separate process, while making a simple shape without requiring a separate member.

In (b) said casing structure, said ground terminal has a backup connection portion protruding from a position different from that of the co-fastening connections, the elastic by bend substantially in a U-shape at the tip of the backup connection unit The first casing or the second casing made of a conductive material is formed at a predetermined interval smaller than the maximum interval between two sides of the sandwiched U-shaped portion that is not elastically deformed. a pair of clamping connection portions, the clamped U-shaped portion characterized in that it is held between a pair of the sandwiching connection. In this way, in the ground terminal, the sandwiched U-shaped portion of the preliminary connection portion is connected to the sandwiching connection portion separately from the joint fastening connection portion, so that the reliability of electrical connection is further improved. Moreover, for example, in a configuration in which the preliminary connecting portion is a simple pressing piece and is in press contact only in one direction (to the conductive material), the pressing piece is plastically deformed from the root to the other direction, or the position of the root is assembled. Due to the deviation, the pressing force is likely to be weak, and the reliability of electrical connection is low. On the other hand, the U-shaped portion to be sandwiched is bent into a substantially U shape and the two sides are sandwiched between the pair of sandwiched connecting portions (respectively press-contacted) by its own elasticity. Even if the position of the base of the preliminary connection portion is displaced due to assembly, poor electrical connection is prevented.

  (C) The edges of the first and second casings, at least one of which is made of a conductive material, are joined together, and the edges are fastened by a fastening member that is inserted into a fastened part formed at a predetermined position of the edge. The electric parts including a ground terminal are accommodated in the first and second casings, and a joint fastening connection portion formed on the ground terminal is disposed so as to surround the fastened portion. A casing structure sandwiched at an edge, wherein the ground terminal has a preliminary connection portion protruding from a position different from the joint connection portion, and is bent into a substantially U shape at the tip of the preliminary connection portion. Thus, a sandwiched U-shaped portion having elasticity is formed, and the first casing or the second casing made of a conductive material is larger than the maximum interval between two sides in the sandwiched U-shaped portion that is not elastically deformed. Casing structure having a pair of clamping connection formed by Sai predetermined intervals, characterized in that the clamped U-shaped portion is sandwiched by the pair of the sandwiching connection. In this way, the ground terminal is connected to the clamping connection portion provided inside the both edge portions of the first and second casings, in addition to the joint connection portion, the sandwiched U-shaped portion of the preliminary connection portion. Therefore, the reliability of electrical connection is improved. Moreover, for example, in a configuration in which the preliminary connecting portion is a simple pressing piece and is in press contact only in one direction (to the conductive material), the pressing piece is plastically deformed from the root to the other direction, or the position of the root is assembled. Due to the deviation, the pressing force is likely to be weak, and the reliability of electrical connection is low. On the other hand, the U-shaped portion to be sandwiched is bent into a substantially U shape and the two sides are sandwiched between the pair of sandwiched connecting portions (respectively press-contacted) by its own elasticity. Even if the position of the base of the preliminary connection portion is displaced due to assembly, poor electrical connection is prevented.

1 is an external view showing a motor of the present embodiment. Explanatory drawing for demonstrating the housing of this Embodiment. Explanatory drawing for demonstrating the member by the side of the housing cover of this Embodiment. Explanatory drawing for demonstrating the housing cover of this Embodiment. AA sectional drawing of FIG. Explanatory drawing for demonstrating the unit plate of this Embodiment. Explanatory drawing for demonstrating the unit plate of this Embodiment. (A) The top view of the 1st power supply side terminal of this Embodiment. (B) The side view of a 1st power supply side terminal similarly. (A) The top view of the 1st fixed contact terminal of this Embodiment. (B) Side view of the first fixed contact terminal. (C) Explanatory drawing for demonstrating the preliminary | backup connection part of a 1st fixed contact terminal similarly. Explanatory drawing for demonstrating a housing cover and a unit plate. Explanatory drawing for demonstrating a housing cover and a unit plate. BB sectional drawing of FIG. CC sectional drawing of FIG. The cross-sectional exploded view of the fastening part in this Embodiment. FIG. 3 is a circuit diagram illustrating an electrical configuration of the present embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 2 ... Motor main body, 7 ... Rotating shaft, 11 ... Housing (1st casing), 11c ... Housing side edge part (edge part), 11d ... Fastening hole (fastened part), 11e ... Construct a part of detour seal part Housing side bypass part, 13 ... Housing cover (second casing), 13a ... Cover side edge part (edge part), 13g ... Fastening hole (fastened part), 13i ... Cover side constituting a part of the bypass seal part Detour portion, 13j ... seal groove, 16 ... seal member, 16a ... seal-side detour portion constituting part of detour seal portion, 23 ... first fixed contact terminal (earth terminal), 23h ... joint fastening connection portion.

Claims (6)

The edges of the first and second casings, at least one of which is made of a conductive material, are joined together, and a fastening member is inserted into a fastened part formed at a predetermined position of the edge so that the first and second casings are mutually connected. In addition to being fastened and fixed, an electrical component including a ground terminal is accommodated in the first and second casings, and a joint fastening portion formed on the ground terminal is sandwiched between the two edges by the fastening and fixing. And a casing structure that is fastened to the fastened portion in contact with a casing made of a conductive material among the first and second casings ,
A seal member is interposed between the edges of the first and second casings,
A bypass seal portion that bypasses and seals the outside of the joint fastening connection portion is provided outside the joint fastening connection portion, and the seal member is attached to at least one of the first and second casings in the bypass seal portion. A casing structure, which is disposed in a recessed seal groove . The casing structure according to claim 1,
A casing structure characterized in that a seal groove is recessed in the edge portion of at least one of the first and second casings via the bypass seal portion, and the seal member is disposed in the seal groove. The casing structure according to claim 2,
The casing structure is characterized in that the seal groove is formed over the entire circumference of the edge. In the casing structure according to any one of claims 1 to 3,
The first and second casings are a gear housing that is fixed to a motor main body that drives a rotating shaft and houses a reduction gear that decelerates and outputs the rotation of the rotating shaft, and a cover that closes an opening of the gear housing. A casing structure characterized by that. The casing structure according to claim 4,
The gear housing is made of a conductive material, and the cover is made of an electrically insulating material,
The cover is provided with a terminal recess for arranging the joint connection portion of the ground terminal, and the seal groove is provided in the bypass seal provided so as to bypass the outside of the terminal recess. A casing structure characterized by being formed. A motor comprising the casing structure according to claim 4 and the motor body.

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