JP2012042034A - Motor with reduction mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent infiltration of rainwater or the like into a gear case.SOLUTION: A seal member 41 is attached to a cover 16 for blocking a storage part of the gear case. The seal member 41 is configured by using an elastomer to integrally form a plate-like part 41a formed in disc shape that covers the inner side face of the cover 16; an inside seal part 41b arranged at the inner peripheral edge of a through hole 16a to come in sliding contact with the outer peripheral surface of an output member; an outside seal part 41c arranged at the outer peripheral part of the cover 16 to abut on the opening edge of the storage part; and an anchor part 41d locked to the front side face of the cover 16 through a mounting hole 16d provided in the cover 16. A boundary portion between the seal member 41 and the cover 16 is connected only to the outside of the gear case without being connected to the inside of the gear case.

Description

  The present invention relates to a motor with a speed reduction mechanism in which a speed reduction mechanism housed in a gear case is attached to a motor body to form one unit.

  As a drive source for a power window device, a wiper device, a sunroof device or the like provided in a vehicle such as an automobile, an electric motor that is operated by a power source such as a battery mounted on the vehicle is often used.

  In order to adapt the electric motor to these devices, it is necessary to reduce the rotational speed of the motor to a required rotational speed. Therefore, as an electric motor for such an application, conventionally, a motor with a speed reduction mechanism that is a single unit by attaching a speed reduction mechanism to the electric motor main body has been used.

  In a motor with a speed reduction mechanism, a gear case is fixed to the yoke of the motor body, and the speed reduction mechanism is accommodated in a bathtub-shaped accommodation portion provided in the gear case. As the speed reduction mechanism, a small worm gear mechanism that can obtain a large reduction ratio is often used. The rotation of the motor shaft is reduced to a predetermined rotational speed by the speed reduction mechanism and transmitted to the output gear (output member). Further, the opening of the accommodating portion is closed by the cover, and the output gear is configured to protrude to the outside of the gear case through a through hole provided in the cover.

  In the motor with a speed reducing mechanism having such a configuration, a seal structure is provided on a cover that closes the housing portion in order to prevent water such as rainwater from entering the inside of the gear case.

  For example, in Patent Document 1, an annular seal member that is in sliding contact with the outer peripheral surface of the output gear is attached to the inner peripheral edge of the through hole of the cover, and the seal member (between the outer peripheral portion of the cover and the open end of the gear case) A motor with a speed reduction mechanism in which an O-ring is arranged is described.

JP 11-146594 A

  However, as shown in Patent Document 1, in the structure in which the seal member is provided on the inner periphery of the through hole of the cover and the outer periphery of the cover, the boundary between the seal member and the cover is located on the inner side and the outer side of the gear case. Therefore, water may enter the inside of the gear case through the boundary portion between the seal member and the cover.

  An object of the present invention is to reliably prevent rainwater and the like from entering the inside of the gear case.

  The motor with a speed reduction mechanism of the present invention includes a motor main body having a motor shaft, a bathtub-shaped accommodating portion, a gear case attached to the motor main body, and a plate having a through hole. A cover that is attached and closes the opening of the housing portion, is rotatably supported by the gear case, a base end portion is housed in the housing portion, and a distal end portion is external to the gear case through the through hole. An output member that protrudes into the housing, a speed reduction mechanism that is housed in the housing portion, decelerates the rotation of the motor shaft and transmits the rotation to the output member, a plate-like portion that covers the inner surface of the cover, and an inside of the through hole An inner seal portion that is disposed on the periphery and is in sliding contact with the outer peripheral surface of the output member, an outer seal portion that is disposed on the outer periphery of the cover and is in contact with the opening end of the housing portion, and a mounting hole provided in the cover The And having a seal member which is provided integrally with the anchor portion to be locked on the front surface of the cover and.

  The motor with a speed reduction mechanism according to the present invention is characterized in that a locking claw provided on the cover is locked to the gear case to fix the cover to the gear case.

  According to the present invention, the boundary portion between the seal member attached to the cover and the cover is connected only to the outside of the gear case, and does not connect to the inside of the gear case. Therefore, it is possible to reliably prevent water such as rainwater from entering the inside of the gear case through the boundary portion between the seal member and the cover.

  In addition, according to the present invention, the boundary between the seal member and the cover is connected only to the outside of the gear case and not to the inside of the gear case, so that the seal member is adhered to the cover using an adhesive or the like. In addition, it is possible to reliably prevent rainwater and the like from entering the inside of the gear case. Therefore, the cost of the motor with a speed reduction mechanism can be reduced as a simple structure in which the seal member is attached to the cover by locking the anchor portion to the front side surface of the cover via the mounting hole.

It is a perspective view of the power window motor which is one embodiment of the present invention. It is sectional drawing which follows the AA line shown in FIG. It is an expanded sectional view which shows the fixation structure to the gear case of a cover. (A) is a top view which shows the detail of a cover, (b) is sectional drawing which follows the AA line shown to (a). (A), (b) is explanatory drawing which shows the flow of the water in the boundary part of a sealing member and a cover, respectively.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  A power window motor 11 as a motor with a speed reduction mechanism shown in FIG. 1 is used as a drive source of a power window device provided in a vehicle such as an automobile, and automatically drives a window glass of a vehicle via a regulator. Open and close.

  The power window motor 11 includes a motor body 12 and a speed reducer 13, and the speed reducer 13 is attached to the motor body 12 to form one unit.

  The motor body 12 is an electric motor with a brush, and its motor shaft 12a (armature shaft) rotates in both the forward direction and the reverse direction.

  On the other hand, the speed reducer 13 includes a gear case 14 made of aluminum alloy. The gear case 14 includes an accommodation portion 14a and a motor attachment portion 14b, and is attached to the opening end of the yoke 12b of the motor body 12 in the motor attachment portion 14b. The accommodating portion 14 a is formed in a cylindrical shape with a bottom that is open at one end, that is, in a substantially circular bathtub shape, and the opening is closed by a cover 16.

  The cover 16 is formed of a resin material in a substantially disk shape, and a through hole 16a is provided in the axial center. In addition, three locking claws 16b are provided on the outer peripheral portion of the cover 16 at regular intervals in the circumferential direction. As shown in FIG. 3, the cover 16 is attached to the gear case 14, and each locking claw 16b is attached. The cover 16 is fixed to the gear case 14 by being engaged with an engagement piece 17 provided on the outer peripheral portion of the housing portion 14 a of the gear case 14.

  A support shaft 18 is integrally provided coaxially with the housing portion 14 a at the bottom of the housing portion 14 a of the gear case 14. The support shaft 18 protrudes in the axial direction from the bottom of the housing portion 14a toward the outside of the gear case 14, and has a large diameter portion 18a on the proximal end side and a larger diameter portion on the distal end side than the large diameter portion 18a. A small-diameter portion 18b having a small diameter is provided.

  An output member 21 is attached to the small diameter portion 18 b of the support shaft 18. The output member 21 is formed in a cylindrical shape from a resin material, and is supported by the small diameter portion 18b in the mounting hole 21a provided in the shaft center, and the axial end portion thereof is the axial end portion of the large diameter portion 18a. Is supported rotatably on the support shaft 18. Further, the base end portion that is one end side in the axial direction of the output member 21 is housed in the housing portion 14 a, and the distal end portion that is the other end side in the axial direction is outside the gear case 14 through the through hole 16 a of the cover 16. It protrudes. The portion of the output member 21 that protrudes to the outside of the gear case 14 is formed as a pinion gear by integrally forming a gear portion 21b on the outer peripheral surface thereof, and the gear portion 21b is provided in the vehicle door. The output of the power window motor 11 is transmitted to the regulator by meshing with the drive gear of the regulator that does not.

  In order to decelerate and transmit the rotation of the motor shaft 12 a to the output member 21, a speed reduction mechanism 31 is accommodated in the accommodation portion 14 a of the gear case 14. As the speed reduction mechanism 31, a worm gear mechanism including a worm 31a and a worm wheel 31b meshing with the worm 31a is used.

  The front end side of the motor shaft 12a protrudes from the yoke 12b and is accommodated in the accommodating portion 14a of the gear case 14, and the worm 31a is integrally formed on the outer peripheral surface of the portion accommodated in the accommodating portion 14a of the motor shaft 12a. .

  On the other hand, the worm wheel 31b is formed of a resin material in an annular shape slightly smaller in diameter than the inner diameter of the accommodating portion 14a, and is mounted on the large diameter portion 18a of the support shaft 18 in a mounting hole 31b1 provided in the shaft center. ing. As a result, the worm wheel 31b is rotatable around the support shaft 18 inside the housing portion 14a. Further, the worm wheel 31 b is formed integrally with the output member 21 and rotates together with the output member 21.

  With such a configuration, when the motor body 12 operates and the motor shaft 12a rotates, the rotation is decelerated to a predetermined number of rotations by the worm 31a and the worm wheel 31b and is output from the output member 21.

  In order to prevent water such as rainwater from entering the inside of the gear case 14, a seal member 41 is attached to the cover 16.

  The seal member 41 is formed of an elastomer such as synthetic rubber, and as shown in FIG. 4, a plate-like portion 41a, an inner seal portion 41b, and an outer seal portion 41c are provided, and these are integrally formed. Yes.

  The plate-like portion 41 a is formed in a disc shape having substantially the same shape as the inner side surface of the cover 16, that is, the surface facing the inner side of the housing portion 14 a when attached to the gear case 14, and overlaps the inner side surface of the cover 16. And covers the entire inner surface.

  The inner seal portion 41 b is formed in an annular shape, and is disposed along the inner peripheral edge so that the outer peripheral surface thereof is in contact with the inner peripheral edge of the through hole 16 a of the cover 16. A pair of lips 41b1 are provided side by side in the axial direction on the inner peripheral surface side of the inner seal portion 41b. Each of the lips 41b1 protrudes inward in the radial direction, and the inner diameter thereof is slightly smaller than the outer diameter of the output member 21, and the outer peripheral surface between the gear portion 21b and the base end portion of the output member 21 Further, they are in sliding contact with being slightly elastically deformed outward in the radial direction. As a result, the space between the through hole 16 a of the cover 16 and the output member 21 is sealed by the inner seal portion 41 b, and intrusion of water such as rain water from between the through hole 16 a and the output member 21 is prevented.

  The outer seal portion 41 c is formed in an annular shape along the outer peripheral portion of the plate-like portion 41 a, and its radial cross section has a U shape that opens toward the accommodating portion 14 a side. The cover 16 is disposed in the outer peripheral portion of the cover 16 by being fitted into a recess 16 c provided along the outer peripheral portion. The outer seal portion 41c is in contact with the opening end by engaging the opening end of the accommodating portion 14a inside the U-shape. Thereby, the combination part of the outer peripheral part of the cover 16 and the opening end of the accommodating part 14a is sealed by the outer seal part 41c, and water such as rain water from the combination part of the outer peripheral part of the cover 16 and the opening end of the accommodating part 14a. Intrusion is prevented.

  In order to fix the seal member 41 to the cover 16, the seal member 41 is provided with nine anchor portions 41d.

  The cover 16 is provided with nine mounting holes 16d penetrating in the axial direction at equal intervals in the circumferential direction, and each anchor portion 41d is attached to the front side surface of the cover 16, that is, the gear case 14 via the corresponding mounting hole 16d. The seal member 41 is fixed to the cover 16 by being locked to the surface facing the side opposite to the accommodating portion 14 a when attached to the cover 16. That is, each anchor portion 41d includes a leg portion 41d1 that protrudes in the axial direction from the plate-like portion 41a and a locking portion 41d2 that is integrally provided at the tip of the leg portion 41d1, and the leg portion 41d1 is a cover. The engaging portion 41d2 is formed in a disk shape having a larger diameter than the mounting hole 16d and is engaged with the front side surface of the cover 16. Accordingly, the seal member 41 is fixed to the cover 16 by sandwiching the cover 16 between the locking portion 41d2 and the plate-like portion 41a.

  The front surface of the cover 16 is provided with a recess 16e corresponding to the locking portion 41d2, and the locking portion 41d2 is disposed in the corresponding recess 16e, so that the front surface of the cover 16 and the locking portion 41d2 Are formed in the same plane.

  The six attachment holes 16d except for the three attachment holes 16d arranged at intervals of 120 degrees in the circumferential direction are connected to the inner peripheral edge of the through hole 16a of the cover 16 by grooves 16f provided on the front side surface of the cover 16, respectively. Yes. The locking portions 41d2 of the anchor portions 41d corresponding to the six mounting holes 16d extend to the inner peripheral edge of the cover 16 along the grooves 16f, and are connected to the outer peripheral portion of the inner seal portion 41b. As a result, the inner seal portion 41b is supported by the plate-like portion 41a and the locking portion 41d2, and is reliably disposed on the inner peripheral edge of the through hole 16a of the cover 16.

  As described above, the seal member 41 used in the power window motor 11 of the present invention is disposed on the inner peripheral edge of the plate-like portion 41 a that covers the inner surface of the cover 16 and the through hole 16 a of the cover 16, and the output member 21. As shown in FIG. 5 (a), rainwater is formed from the boundary portion between the inner peripheral edge of the through-hole 16a of the cover 16 and the inner seal portion 41b. Even if water such as water enters, the intruded water is led to the outer peripheral portion of the cover 16 through the boundary between the inner surface of the cover 16 and the plate-like portion 41a of the seal member 41, and the open end of the accommodating portion 14a. Is discharged to the outside of the opening end of the accommodating portion 14 a, that is, the outside of the gear case 14 through the boundary portion between the outer seal portion 41 c and the cover 16. Further, even when water such as rainwater enters from the boundary portion between the locking portion 41d2 of the anchor portion 41d and the cover 16, the water passes between the inner surface of the cover 16 via the boundary portion between the leg portion 41d1 and the mounting hole 16d. It reaches the boundary portion of the plate-like portion 41a of the seal member 41, and from there, it is discharged to the outside of the gear case 14 in the same manner as described above. Furthermore, as shown in FIG. 5 (b), in the portion where the groove 16f is provided in the cover 16, the water such as rain water that has entered from the boundary portion between the locking portion 41d2 of the anchor portion 41d and the cover 16 is similarly applied. Reaches the boundary portion between the inner surface of the cover 16 and the plate-like portion 41a of the seal member 41 via the boundary portion between the leg portion 41d1 and the mounting hole 16d, and is discharged from the gear case 14 to the boundary portion. become.

  Thus, in this power window motor 11, the boundary portion between the seal member 41 attached to the cover 16 and the cover 16 is continuous only to the outside of the gear case 14, and is not continuous to the inside of the gear case 14. Even if water such as rainwater enters from the boundary portion between the seal member 41 and the cover 16, the water does not enter the inside of the gear case 14 through the boundary portion. Therefore, intrusion of water such as rain water into the gear case 14 can be reliably prevented.

  Further, in this power window motor 11, water such as rainwater that has entered from the boundary portion between the seal member 41 and the cover 16 does not reach the inside of the gear case 14 through the boundary portion. It is possible to reliably prevent the intrusion of water such as rain water into the gear case 14 without using the seal member 41 in close contact with the cover 16. Therefore, as a structure for fixing the seal member 41 to the cover 16, this power window motor is used by using a simple structure for locking the anchor portion 41 d to the front side surface of the cover 16 without using an adhesive structure using an adhesive. 11 costs can be reduced.

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the above-described embodiment, the motor with the speed reduction mechanism of the present invention is applied to the vehicle power window motor 11. However, the present invention is not limited to this. For example, a drive source for a wiper motor or a sunroof device used as a drive source for a wiper device. The present invention may be applied to other motors with a speed reduction mechanism such as a sunroof motor.

  Moreover, in the said embodiment, although the output member 21 and the worm wheel 31b are integrally formed with a resin material, not only this but the output member 21 and the worm wheel 31b are formed separately, The output member 21 and the worm wheel 31b may be connected to transmit power by using a connection structure.

  Furthermore, in the said embodiment, although the output member 21 becomes a structure where the gear part 21b is integrally provided, not only this but the gear part 21b formed separately from the output member 21 is used as an output member. It is good also as a structure fixed to 21.

11 Power window motor (motor with reduction mechanism)
12 motor body 12a motor shaft 12b yoke 13 speed reducer 14 gear case 14a accommodating portion 14b motor mounting portion 16 cover 16a through hole 16b locking claw 16c recess 16d mounting hole 16e recess 16f groove 17 locking piece 18 support shaft 18a large diameter portion 18b Small diameter portion 21 Output member 21a Mounting hole 21b Gear portion 31 Deceleration mechanism 31a Worm 31b Worm wheel 31b1 Mounting hole 41 Seal member 41a Plate-like portion 41b Inner seal portion 41b1 Lip 41c Outer seal portion 41d Anchor portion 41d1 Leg portion 41d2 Locking portion

Claims (2)

A motor body having a motor shaft;
A gear case provided with a bathtub-shaped accommodation portion and attached to the motor body;
A cover that is formed in a plate shape having a through hole, is attached to the gear case, and closes the opening of the accommodating portion;
An output member that is rotatably supported by the gear case, a base end portion is housed in the housing portion, and a distal end portion projects outside the gear case through the through hole;
A speed reduction mechanism that is housed in the housing part and decelerates the rotation of the motor shaft and transmits it to the output member;
A plate-like portion that covers the inner surface of the cover; an inner seal portion that is disposed on the inner peripheral edge of the through hole and that is in sliding contact with the outer peripheral surface of the output member; and an opening of the housing portion that is disposed on the outer peripheral portion of the cover A speed reducer comprising: an outer seal portion that contacts an end; and a seal member that integrally includes an anchor portion that is locked to a front side surface of the cover through an attachment hole provided in the cover. Motor with mechanism.   The motor with a speed reduction mechanism according to claim 1, wherein a locking claw provided on the cover is locked to the gear case to fix the cover to the gear case.

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