JP2011021725A - Motor with reduction mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To thin the wall of a resin gear case cover for a gear case of a motor with a reduction mechanism. <P>SOLUTION: A motor power window motor device 1 with the reduction mechanism includes: a motor part 2; a gear case 5 including a worm wheel storage part 60 storing a worm wheel 75; a through-hole 82 with a small-diameter part 77 of the worm wheel inserted therethrough; the gear case cover 81 fixed to the gear casing to cover the worm wheel storage part; and a seal member 80 fixed to the gear case cover. The gear case cover includes a plurality of communicating holes 85 serving for communication between a rear face 83e and a front face 83a of a disk part 83, and small grooves 83f formed in the rear face 83e to connect the communicating holes. The seal member exists in the communicating holes and grooves and is provided along the rear face of the disk part. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a motor with a speed reduction mechanism, and more particularly to a power window motor for an automobile.

  2. Description of the Related Art Conventionally, a motor device used as a drive source for a power window device includes a motor main body and a speed reduction mechanism, and the rotational force of the motor main body is decelerated by the speed reduction mechanism and transmitted to the lift mechanism of the power window device. Some reduction mechanisms have a worm formed on the rotating shaft of a motor and an output shaft connected to the rotating shaft of a worm wheel that meshes with the worm.

  In such a reduction mechanism, the worm wheel is rotatably supported in an accommodation recess formed in a gear case that forms the framework of the reduction mechanism, and the accommodation recess is closed by an annular gear case cover with the output shaft protruding from the accommodation recess. There is what was made to do (for example, patent documents 1). At this time, a seal member is interposed between the gear case and the gear case cover for the purpose of preventing water and the like from entering. Such a gear case and a gear case cover are usually formed of a metal material from the viewpoint of strength.

JP 2002-156007 A

  From the viewpoint of reducing the weight of the motor with a speed reduction mechanism, the gear case and the gear case cover are preferably formed of a resin material. However, when the gear case cover is formed of a resin material, there is a problem that it is necessary to increase the thickness in order to ensure strength. On the other hand, from the viewpoint of assembly of the seal member, the seal member is preferably formed integrally with the gear case cover. However, when the seal member is formed on the surface of the gear case cover by outsert molding, the thickness of the seal member must be secured to a predetermined amount or more in order to prevent molding failure, and the thickness of the gear case cover including the seal member There is a problem that becomes thicker. When a motor with a speed reduction mechanism is used as a drive source for a power window device, the installation space is limited, and thus the gear case cover is desired to be thin.

  The present invention has been made in view of the above problems. Even when the gear case cover is formed of a resin material and the seal member is integrally formed with the gear case cover by outsert molding, the gear case cover including the seal member is provided. An object of the present invention is to provide a motor with a speed reduction mechanism that can reduce the thickness of the motor.

  In order to solve the above-mentioned problem, a first invention of the present invention is a motor (motor unit 2) having a worm (11) on a rotating shaft (rotor shaft 9), and a worm storage unit (10 ) And a gear case (5) having a worm wheel receiving portion (60) recessed to rotatably receive a worm wheel (75) meshing with the worm, and fixed to the worm wheel, A gear case having an output shaft (small diameter portion 77) protruding from the worm wheel housing portion and a through hole (82) through which the output shaft is inserted, and fixed to the gear case so as to close the worm wheel housing portion. A cover (81), fixed to the gear case cover, between the gear case cover and the gear case, and the gear A motor with a speed reduction mechanism (power window motor device 1) having a seal member (80) for sealing between the output cover and the output shaft, the gear case cover on the worm wheel housing portion side of the gear case cover A plurality of communication holes (85) communicating the part (the back surface 83e of the disk part 83) and the part opposite to the part (the front surface 83a of the disk part 83) and the communication holes are connected to each other. A groove (small groove 83f) formed in a portion on the worm wheel housing portion side, and the seal member is present in the communication hole and the groove, and on the worm wheel housing portion side of the gear case cover. It is provided along the part.

  When a resin seal member is formed on the surface of the gear case cover by outsert molding, the groove formed in the gear case cover on the worm wheel housing portion side functions as a molten resin supply path that constitutes the seal member. Therefore, even when the thickness of the seal member is thin, the seal member is supplied uniformly on the surface of the gear case cover, and the seal member can be thinned. Further, since the seal member passes through the communication path and reaches the portion of the gear case cover opposite to the worm wheel housing portion, the seal member is fixed to the gear case cover and is not detached.

  According to a second aspect of the present invention, in the first aspect, the groove extends from a peripheral portion of the through hole, and the seal member extends from the portion of the gear case cover on the worm wheel housing portion side to the through hole. A first portion extending along a peripheral edge of the worm wheel housing portion to a side opposite to the worm wheel housing portion side, and a second portion extending through the communication hole to a side opposite to the worm wheel housing portion side. And the first part and the second part are connected to each other at a part opposite to the worm wheel housing part side.

  According to this, the seal member forms a closed ring including the gear case cover, and is securely fixed to the gear case cover.

  According to the present invention, the seal member can be formed uniformly and thinly on the surface of the gear case cover. Further, the seal member can be securely fixed to the gear case cover.

It is a side view which shows the power window motor apparatus which concerns on embodiment. It is a longitudinal cross-sectional view which shows a power window motor apparatus. It is a disassembled perspective view which shows a power window motor apparatus. It is a side view which shows the gear case of a power window motor apparatus. It is a disassembled perspective view which shows the brush unit of a power window motor apparatus. It is a perspective view which shows the brush unit of a power window motor apparatus. It is a perspective view which shows the brush unit of a power window motor apparatus. It is a perspective view which shows a principal part of a power window motor device with a motor yoke omitted. It is a side which shows a principal part of a power window motor device, omitting a motor yoke. It is the perspective view seen from the direction of arrow X of FIG. It is a perspective view which shows the gear case of a power window motor apparatus. It is a side view which shows the assembly | attachment positional relationship of a gear case, a worm wheel, and a gear case cover. It is a top view which shows the worm wheel of a power window motor apparatus. It is a reverse view which shows the worm wheel of a power window motor apparatus. It is sectional drawing seen from the arrow XV-XV of FIG. It is a top view which shows the gear case cover of a power window motor apparatus. It is a reverse view which shows the gear case cover of a power window motor apparatus. It is sectional drawing seen from the arrow XVIII-XVIII of FIG. It is sectional drawing which shows the coupling structure of a gear case and a gear case cover.

  Hereinafter, an embodiment in which the present invention is applied to a power window motor device 1 used as a drive source of a lift mechanism of a power window device of an automobile will be described in detail with reference to the drawings. Drawing 1 is a side view showing power window motor device 1 concerning an embodiment. FIG. 2 is a longitudinal sectional view showing the power window motor device 1. FIG. 3 is an exploded perspective view showing the power window motor device 1.

  As shown in FIG. 1, the power window motor apparatus 1 has a motor unit 2 and a speed reduction unit 3 as main components. The motor unit 2 is a DC motor (brush motor).

  As shown in FIGS. 1 to 3, the motor yoke 4 constituting the skeleton structure of the motor unit 2 is formed in a bottomed cylindrical shape having a bottom 4 a at one end, and is opposed to each other on its side peripheral part. A pair of arcuate surfaces 4b, and a pair of flat surfaces 4c arranged between both ends of the arcuate surface 4b. A flange portion 4d protruding outward is formed on the opening end side of the motor yoke 4, and three screw holes 51 are formed in the flange portion 4d. The arc surface 4b of the motor yoke 4 is enlarged in the vicinity of the opening end, and a stepped portion 4e is formed at the enlarged boundary. The central portion of the bottom portion 4a of the motor yoke 4 bulges outward from the yoke to form a bearing housing portion 4f. The motor yoke 4 is formed by press forming a conductive steel plate.

  FIG. 4 is a side view showing the gear case 5 of the power window motor device 1. As shown in FIGS. 3 and 4, the gear case 5 includes an opening 6 that coincides with the cross section of the motor yoke 4 at a portion facing the opening end of the motor yoke 4, and a flat portion 7 a is formed on the periphery of the opening 6. Is formed. Furthermore, a flat surface portion 7b that is in contact with the flange portion 4d of the motor yoke 4 is formed outside the flat surface portion 7a via a step portion 7c. Four projecting portions 7d projecting toward the motor yoke 4 are formed at the boundary between the flat surface portion 7a and the opening 6, and the projecting portions 7d come into contact with the inner peripheral surface of the motor yoke 4. ing. Further, a concave portion 7e that engages with a brush unit 14 to be described later is formed in the flat surface portion 7a.

  A screw hole 52 is formed in the flat portion 7 b of the gear case 5 at a position that coincides with the screw hole 51 of the flange portion 4 d of the motor yoke 4. The motor yoke 4 is fixed to the gear case 5 by inserting an annular gasket 40 between the flat surface portion 7 b and the flange portion 4 d and inserting the screw 53 into the screw hole 51 and the screw hole 52. A screw hole 90 is formed in the gear case 5, and the gear case 5 is fixed to a vehicle body frame (not shown) by inserting a screw into the screw hole 90.

  A pair of permanent magnets 8 are arranged on the inner peripheral surface of the arc surface 4b of the motor yoke 4 so that the surfaces having the same polarity face each other. Thereby, the pole different from the pole which appears in the mutually opposing surface of the permanent magnet 8 is pseudo-formed in the internal peripheral surface of the plane part 4c.

  A metal bearing 54 is fitted in the bearing housing portion 4f of the motor yoke 4 coaxially with the axis of the motor yoke 4, and one end of the rotor shaft 9 serving as a motor rotation shaft is rotatably supported by the metal bearing 54. Yes. Thus, the axis of the rotor shaft 9 is coaxial with the axis of the motor yoke 4. An end spacer 55 is interposed between the thrust end of the rotor shaft 9 and the bearing housing portion 4f so that the rotor shaft 9 and the bearing housing portion 4f do not come into contact with each other.

  The other end of the rotor shaft 9 protrudes from the opening end of the motor yoke 4, passes through the opening 6 of the gear case 5, and extends into the bottomed hole-shaped worm accommodating portion 10 communicating with the opening 6. The rotor shaft 9 is rotatably supported by two metal bearings 56 and 57 provided in the vicinity of the inlet portion 10a and the bottom portion 10b of the worm housing portion 10, respectively. The other end of the rotor shaft 9 is supported by the end spacer 58 in the thrust direction. A thrust damper 59 is provided between the end spacer 58 and the bottom portion 10b of the worm accommodating portion 10 so that the end spacer 58 can follow the minute movement of the rotor shaft 9 in the thrust direction. The rotor shaft 9 includes a worm 11 at an intermediate portion of the portion supported by the metal bearings 56 and 57 in the worm accommodating portion 10.

  The rotor shaft 9 includes an armature 12 at a portion facing the permanent magnet 8 in the motor yoke 4. The armature 12 includes an iron core 12a fixed to the rotor shaft 9 and a coil 12b wound around the iron core 19a. Further, the rotor shaft 9 includes a commutator 13 at a position close to the armature 12. The commutator 13 extends in the circumferential direction of the rotor shaft 9, and a plurality of segments 13 a are arranged in the circumferential direction on the outer circumferential surface thereof. Each segment 13a is coupled to the end of a coil 12b.

  A brush unit 14 is provided at a boundary portion between the motor yoke 4 and the gear case 5 and facing the segment 13 a of the commutator 13. The brush unit 14 includes a brush 15 that is in sliding contact with the segment 13 a and a brush holder 16 that supports the brush 15.

  5 is an exploded perspective view showing the brush unit 14, FIG. 6 is a perspective view of the brush unit viewed from the motor yoke side, and FIG. 7 is a perspective view of the brush unit 14 viewed from the gear case side. As shown in FIG. 5, the brush holder 16 is formed of a resin material and has an annular shape, and includes a through hole 17 through which the rotor shaft 9 and the commutator 13 are inserted.

  The outer periphery of the brush holder 16 has a gear case abutting portion 18a projecting radially outward with respect to the axis of the brush holder 16 and a projecting end portion of the gear case abutting portion 18a toward the motor yoke 4 side. L-shaped positioning pieces 18 having yoke contact portions 18b are formed in four locations dispersed in the circumferential direction. The position of the brush holder 16 is fixed with respect to the gear case 5 by engaging the gear case contact portion 18 a of the positioning piece 18 with the recess 7 e of the gear case 5. In this state, the yoke contact portion 18 b of the positioning piece 18 is arranged side by side with the protruding portion 7 d of the gear case 5 and contacts the inner peripheral wall of the motor yoke 4.

  As shown in FIGS. 5 and 6, the brush holder 16 is formed with a pair of brush accommodating portions 20 at positions facing the axis of the through hole 17. The brush housing portion 20 extends in the radial direction of the through hole 17 and communicates with the outer peripheral portion of the through hole 17 and the brush holder 16. The brush 15 is accommodated in the brush accommodating portion 20 so as to be slidable in the radial direction of the through hole 17, and is urged toward the center of the through hole 17 by a torsion spring 21. One end of a U-shaped first conducting wire 22 extending to the motor yoke 4 side is connected to the brush 15, and the other end of the first conducting wire 22 is connected to one end of a second conducting wire 23 formed in a torsion spring shape. Connected. The other end of the second conducting wire 23 extends to the gear case 5 side of the brush holder 16.

  As shown in FIG. 7, the first brush side connection terminal 24 and the second brush side connection terminal 25 are provided on the gear case 5 side of the brush holder 16. The first brush side connection terminal 24 includes a base portion 24a disposed along the surface 16a on the gear case 5 side of the brush holder 16, and a strip-shaped piece terminal that stands up in parallel with the axial direction of the through hole 17 from one end of the base portion 24a. Part 24b. The second brush side connection terminal 25 stands up in parallel with the axial direction of the through hole 17 from one end of the base portion 25a arranged along the surface 16a of the brush holder 16 and the base portion 24a, and the first brush side connection terminal 24. Terminal portion 24b and a strip-shaped terminal portion 25b opposite to each other.

  The 1st brush side connection terminal 24 is connected to one of the 2nd conducting wires 23 in base 24a. On the other hand, the second brush side connection terminal 25 is connected to the other of the second conductors 23 through a circuit breaker 26 and a metal piece 27 connected to the circuit breaker 26. Each connection is made by welding. Thereby, one of the brushes 15 is connected to the first brush side connection terminal 24, and the other of the brushes 15 is connected to the second brush side connection terminal 25 via the circuit breaker 26.

  A ground 28 is fixed to the brush holder 16. The ground 28 is fixed to the surface 16 a of the brush holder 16, and stands up from the base 28 a and extends toward the motor yoke 4 along the side peripheral portion 16 b of the brush holder 16. An extended portion 28b protruding from the surface 16c on the side, and a distal end that is folded back from the distal end of the extended portion 28b and extends outward of the brush holder 16 and toward the gear case 5 at a predetermined angle with the extended portion 28b. Part 28c. When the brush unit 14 is inserted into the motor yoke 4, the distal end portion 28 c is pressed by the inner peripheral portion of the motor yoke 4 to bend toward the extending portion 28 b and maintains contact with the inner peripheral surface of the motor yoke 4. Be able to.

  The brush holder 16 is formed with a first capacitor housing portion 30, a second capacitor housing portion 31, and a varistor housing portion 32, and a first capacitor 33, a second capacitor 34, and a varistor 35 are supported respectively. The terminals of the first capacitor 33, the second capacitor 34, and the varistor 35 protrude to the surface 16 a side of the brush holder 16, and the terminals of the first capacitor 33 are the base portion 24 a of the first brush side connection terminal 24 and the base portion of the ground 28. The terminal of the second capacitor 34 is connected to the metal piece 27 and the base 28a of the ground 28, and the terminal of the varistor 35 is connected to the base 24a of the first brush side connection terminal 24 and the second brush side connection terminal 25. Connected to the base 25a.

  FIG. 8 is a perspective view showing the main part of the power window motor apparatus 1 with the motor yoke 4 omitted, and FIG. 9 is a side view showing the main part of the power window motor apparatus 1 with the motor yoke 4 omitted. As shown in FIG. 8, the gasket 40 includes a pair of opposing arc-shaped portions 40 a having the same shape and a linear portion 40 b connecting the opposite ends, and a point-symmetric ring having a central axis as a symmetrical center. Presents a shape. The gasket 40 is disposed on the plane portion 7a of the gear case 5 so that the center of symmetry coincides with the axis of the rotor shaft 9, and is positioned by the stepped portion 7c and the protruding portion 7d. The thickness of the gasket 40 is larger than the height of the stepped portion 7c and protrudes to the motor yoke 4 side from the flat portion 7b.

  The gasket 40 includes a total of four notches 41, two on the inner periphery of the arcuate portion 40a. As shown in FIGS. 8 and 9, each notch 41 is arranged at a position that is point-symmetric with respect to the symmetry center of the gasket 40, and a line segment that connects the midpoints of the arc-shaped portion 40 a. It arrange | positions so that it may become symmetric about L1 or the line segment L2 which connects the midpoints of the linear part 40b as a symmetry axis. Thereby, for example, even if the gasket 40 is arranged upside down or upside down, the notch 41 is always arranged at a predetermined position. One of the notches 41 is provided with a tip 28c of the ground 28. Since the gap 41 is secured between the gasket 40 and the ground 28 by the notch 41, the gasket 40 is prevented from being lifted up by the contact of the tip 28c, and the gasket 40 is disposed at a predetermined position without being damaged.

  As shown in FIGS. 2 and 4, the inner wall 6 a of the opening 6 of the gear case 5 supports the tips of the terminal portion 24 b of the first brush side connection terminal 24 and the terminal portion 25 b of the second brush side connection terminal 25. A terminal end accommodating portion 42 is projected. The terminal end accommodating portion 42 is formed with engagement holes 43 and 44 that engage with the tips of the terminal portions 24b and 25b of the respective terminals.

  FIG. 10 is a perspective view seen from the direction of arrow X in FIG. As shown in FIG. 10, the opening 6 communicates with an opening 45 that opens in a direction substantially orthogonal to the direction in which the opening 6 opens. In a state where the brush unit 14 is attached to the gear case 5, the distal ends of the terminal portion 24 b of the first brush side connection terminal 24 and the terminal portion 25 b of the second brush side connection terminal 25 are engaged with the engagement holes 43 of the terminal end accommodating portion 42. , 44, and the positions of the terminal portions 24b, 35b are fixed.

  As shown in FIG. 3, the power connection unit 46 is inserted into the opening 45. The power connection unit 46 includes a power terminal (not shown) connected to the first brush side connection terminal 24 and the second brush side connection terminal 25, and a sensor substrate 47 including a hall sensor. As shown in FIGS. 4 and 10, a guide groove 48 extending in the direction in which the opening 45 opens is formed in the inner wall 6 a of the opening 6. The sensor substrate 47 is positioned with one side engaged with the guide groove 48 so that the Hall sensor faces the ring magnet 49 fixed to the rotor shaft 9.

  FIG. 11 is a perspective view showing the gear case 5 of the power window motor device 1. As shown in FIG. 11, the gear case 5 is provided with a bottomed cylindrical worm wheel housing portion 60, and the worm wheel housing portion 60 communicates with the worm housing portion 10 at a side peripheral wall 61 thereof. A small-diameter boss portion 64 having a boss hole 63 and a large-diameter boss portion 65 formed coaxially so as to surround the small-diameter boss portion 64 are formed at the center portion of the bottom portion 62 of the worm housing portion 10. A center shaft 66 is fixed to the boss hole 63.

  The outer peripheral portion of the side peripheral wall 61 of the worm wheel housing portion 60 is widened at the end portion 67 so that the outer peripheral portion is expanded outward. The end portion 67 includes an inner peripheral wall 67a extending along the inner peripheral edge and an outer peripheral wall 67b extending along the outer peripheral edge of the end portion 67, and has a groove shape. In the bottom 67c between the inner peripheral wall 67a and the outer peripheral wall 67b, rectangular through-holes 70 that penetrate to the bottom 62 side along the axial direction of the worm wheel housing portion 60 are formed at intervals of approximately 120 ° in the circumferential direction. Has been. A tongue piece-like engagement piece 72 cut out by two slits 71 is formed in a portion of the side peripheral wall 61 of each through hole 70 on the outer side in the radial direction of the worm accommodating portion 10. The engaging piece 72 is bent so that the tip end portion 72a protrudes inward of the through hole 70, and the end surface 72b of the tip end portion 72a protrudes at one end on the through hole 70 side as compared with the other end. So as to be inclined.

  FIG. 12 is a side view showing the positional relationship between the gear case 5, the worm wheel 75 and the gear case cover 81. 13 is a plan view showing the worm wheel 75 of the power window motor device 1, FIG. 14 is a back view showing the worm wheel 75 of the power window motor device 1, and FIG. 15 is shown by arrows XV-XV in FIG. FIG.

  As shown in FIGS. 3 and 12, a worm wheel 75 is pivotally supported on the center shaft 66. The worm wheel 75 is formed by injection molding a resin material. The worm wheel 75 includes a large-diameter portion 76 and a small-diameter portion 77 that is provided coaxially with the large-diameter portion 76 and projects in the axial direction with respect to the large-diameter portion 76.

  As shown in FIGS. 12-15, the large diameter part 76 is provided with the inner cylinder 76a and the outer cylinder 76b which were provided coaxially, between the inner cylinder 76a and the outer cylinder 76b, the annular flat plate 76c, and a flat plate It is connected to a plurality of ribs 76d arranged on the front and back surfaces of 76c. The two ribs 76d arranged in parallel form one set, and the ribs 76d are arranged radially about the axis of the worm wheel 75 at equal intervals in the circumferential direction for each set of ribs. In this embodiment, six sets of ribs 76d are arranged at intervals of 60 ° in the circumferential direction. The ribs 76d are arranged at corresponding positions on the front and back surfaces of the flat plate 76c.

  A gear portion 76e that meshes with the worm 11 is formed on the outer surface of the outer cylinder 76b of the large diameter portion 76. Further, a meat stealing portion 76f is formed in the outer cylinder 76b in the circumferential direction so as to prevent the gear portion 76e from warping or sinking.

  The small diameter portion 77 is connected to one end of the inner cylinder 76 a of the large diameter portion 76. The small-diameter portion 77 has a through hole 77a at the center, and a serration 77b is formed at the end. The opening end of the through hole 77a on the large diameter portion 76 side is expanded in diameter to form an O-ring accommodating portion 77c. A plurality of meat stealing portions 77d are formed between the through hole 77a and the serration 77b so as to surround the through hole 77a, and a plurality of meat stealing so as to surround the through hole 77a even in a portion where the serration 77b is not formed. A portion 77e is formed.

  The worm wheel 75 has a gear case in which the inner cylinder 76 a of the large diameter portion 76 is pivotally supported by the large diameter boss portion 65 of the worm wheel housing portion 60 and the through hole 77 a of the small diameter portion 77 is pivotally supported by the center shaft 66. 5 is rotatably supported. In a state where the worm wheel 75 is supported by the gear case 5, the gear portion 76 e of the worm wheel 75 meshes with the worm 11. An O-ring 78 is fitted on the center shaft 66, and the O-ring 78 is disposed in the O-ring housing portion 77 c of the worm wheel 75.

  As shown in FIGS. 3 and 12, the worm wheel housing portion 60 is closed by a gear case cover 81 to which the seal member 80 is fixed in a state where the worm wheel 75 is housed. The gear case cover 81 is formed by injection molding a resin material. The gear case cover 81 has a disc portion 83 having a through hole 82 in the center thereof, and three check engagement claws 84 that stand up from the peripheral portion of the disc portion 83. The check engagement claws 84 are arranged at intervals of 120 ° in the circumferential direction of the disc portion 83 so as to coincide with the through holes 70 of the worm wheel housing portion 60. The check engagement claw 84 includes an inclined surface 84a that protrudes outward from the distal end toward the proximal end side, and a check engagement surface 84b that is formed adjacent to the protruding end of the inclined surface 84a. Yes. The check engagement surface 84b is inclined so as to go toward the tip end side of the check engagement claw 84 as it proceeds from one end adjacent to the protruding end of the inclined surface 84a to the other end opposite to the other end.

  16 is a plan view showing the gear case cover 81 of the power window motor device 1, FIG. 17 is a rear view showing the gear case cover 81 of the power window motor device 1, and FIG. 18 is viewed from arrows XVIII-XVIII in FIG. FIG. 6 is a sectional view showing a state where the gear case cover 81 and the seal member 80 are combined.

  As shown in FIG. 16, the disc portion 83 is an annular recess 83 b that is recessed along the periphery of the through hole 82 on the front surface 83 a (the surface opposite to the surface facing the worm wheel housing portion 60 side). And a plurality of grooves 83c extending outward in the radial direction from the recess 83b. The groove 83c has a circular widened portion 83d at the tip, and a communication hole 85 penetrating to the back surface 83e (surface facing the worm wheel housing portion 60 side) of the disc portion 83 at the center thereof.

  As shown in FIG. 17, on the back surface 83e of the disk portion 83, a small groove 83f that connects the communication holes 85 to each other and extends to the periphery of the through-hole 82 and is formed over most of the back surface 83e, and the vicinity of the outer periphery And an annular large groove 83g formed in the circumferential direction. The large groove 83g is formed wider and deeper than the small groove 83f.

  As shown in FIG. 18, a seal member 80 is coupled to the gear case cover 81. The seal member 80 is formed by outsert molding a flexible resin material on the gear case cover 81. The seal member 80 exists in the entire area of the concave portion 83b, the groove 83c, the circular widened portion 83d, the communication hole 85, the peripheral edge portion of the through hole 82, and the back surface 83e of the disc portion 83, and is a closed ring that entrains part of the disc portion 83. Is forming.

  Two annular thin pieces 80b projecting toward the center side of the through hole 82 in the circumferential direction are formed on the inner peripheral portion of the annular portion 80a existing on the periphery of the through hole 82 of the seal member 80. The thin-walled piece 80b is inclined and protrudes at a predetermined angle in a direction opposite to the worm wheel housing portion 60 side. The diameter of the hole 80c formed in the central portion of the thin piece 80b is formed to be slightly smaller than the outer diameter of the small diameter portion 77 of the worm wheel 75.

  The seal member 80 is provided along the side wall and bottom of the large groove 83g formed on the back surface 83e of the disk portion 83, and an annular engagement groove 80d extending along the large groove 83g is formed in the large groove 83g. is doing. An engagement protrusion 80e extending along the engagement groove 80d is formed in the vicinity of the opening end of the engagement groove 80d.

  FIG. 19 is a cross-sectional view showing a coupling structure between the gear case 5 and the gear case cover 81. As shown in FIG. 19, the peripheral portion of the gear case cover 81 to which the seal member 80 is coupled is supported by the outer peripheral wall 67 b and the bottom portion 67 c of the end portion 67 of the side peripheral wall 61 of the worm wheel housing portion 60. The formed engagement groove 80d is engaged with the inner peripheral wall 67a.

  In a state where the gear case cover 81 is attached to the gear case 5, the check engagement claw 84 and the engagement piece 72 are engaged. When the gear case cover 81 is attached to the gear case 5, the check engagement claw 84 pushes the engagement piece 72 outward of the through hole 70 by the inclined surface 84 a, and deforms the engagement piece 72 while penetrating. Enter hole 70. In the state where the attachment is completed, the check engagement surface 84b of the check engagement claw 84 and the end surface 72b of the engagement piece 72 come into contact with each other to prevent the attachment. In the state where the check engagement surface 84b and the end surface 72b are in contact with each other, if a force for removing the check engagement claw 84 from the through hole 70 is applied, the check engagement surface 84b presses the inclined end surface 72b. The engaging piece 72 is applied with a force toward the inner side of the through hole 70. Therefore, the contact between the check engagement surface 84b and the end surface 72b is maintained, and the engagement between the check engagement claw 84 and the engagement piece 72 is difficult to be released.

  The thin piece 80b of the seal member 80 is deformed by the small diameter portion 77 of the worm wheel 75, the hole 80c is enlarged, and the liquid tight seal is formed in close contact with the outer peripheral surface 77f of the small diameter portion 77.

  By assembling the gear case cover 81 to the gear case 5, the worm wheel housing portion 60 is sealed liquid-tight from the outside. Even if water enters from between the front surface 83 a of the disk portion 83 and the seal member 80, the joint between the disk portion 83 and the seal member 80 is outside the inner peripheral wall 67 a of the end portion 67 of the side peripheral wall 61. Therefore, water cannot enter the worm wheel housing portion 60.

  Since the gear case cover 81 in the present embodiment has the small groove 83f on the back surface 83e of the disc portion 83, when the seal member 80 is formed thin on the back surface 83e of the disc portion 83 by outsert molding, the small groove 83f is formed. It becomes a supply path of the seal member 80, and the seal member 80 is uniformly distributed over the entire back surface 83e.

  Although the description of the specific embodiment is finished as described above, the present invention is not limited to the above embodiment and can be widely modified. For example, the formation pattern of the small groove 83f, the communication hole 85, and the groove 83c is an example, and can be changed as appropriate. Other configurations of the power window motor device can be changed as appropriate without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1 Power window motor apparatus 2 Motor part 3 Deceleration part 4 Motor yoke 5 Gear case 9 Rotor shaft 10 Worm accommodating part 11 Worm 14 Brush unit 40 Gasket 60 Warm wheel accommodating part 75 Warm wheel 80 Seal member 81 Gear case cover 82 Through-hole 83 Disc Portion 83a Front 83b Recess 83c Groove 83e Back 83f Small groove 84 Check engagement claw 85 Communication hole

Claims (2)

A motor with a worm on the rotating shaft;
A gear case including a worm housing portion that houses the worm, and a worm wheel housing portion that is recessed to rotatably accommodate a worm wheel that meshes with the worm;
An output shaft fixed to the worm wheel and projecting from the worm wheel housing portion;
A gear case cover having a through-hole through which the output shaft is inserted and fixed to the gear case so as to close the worm wheel housing portion;
A motor with a speed reduction mechanism, which is fixed to the gear case cover and has a seal member that seals between the gear case cover and the gear case and between the gear case cover and the output shaft;
The gear case cover includes a plurality of communication holes that connect a portion of the gear case cover on the worm wheel storage portion side and a portion opposite to the portion, and the worm wheel storage so as to connect the communication holes. A groove formed in the part on the part side,
The motor with a speed reduction mechanism, wherein the seal member is provided in the communication hole and the groove, and is provided along a portion of the gear case cover on the worm wheel housing portion side. The groove extends to a peripheral edge of the through hole,
The seal member includes a first portion extending from a portion on the worm wheel housing portion side of the gear case cover to a portion on the side opposite to the worm wheel housing portion side along a peripheral edge portion of the through hole, and the communication hole And a second portion extending to a portion on the side opposite to the worm wheel housing portion side, wherein the first portion and the second portion are portions on the side opposite to the worm wheel housing portion side. The motor with a speed reduction mechanism according to claim 1, wherein the motor is connected.

Images