JP4490856B2 - Mirror device for vehicle - Google Patents

Description

  The present invention relates to a vehicle mirror device in which a driving means including an electric motor is built in an actuator case so that a mirror holder that holds a mirror can be driven to swing, and the actuator case is fixed in a mirror housing. In particular, the present invention relates to a structure improvement for suppressing the generation of noise due to vibration of an electric motor.

In order to suppress the generation of noise due to vibration of the electric motor, a buffer member is interposed between the front and rear bearing portions of the electric motor and the actuator case (see Patent Document 1), or a leaf spring member that holds the motor housing of the electric motor. Is provided in the actuator case (see Patent Document 2).
Japanese Patent Publication No. 60-58054 JP-A-6-206495

  However, each of those disclosed in Patent Document 1 and Patent Document 2 requires a member different from the actuator case, which increases the number of parts and requires additional man-hours in the assembly and molding process.

  The present invention has been made in view of such circumstances, and provides a vehicle mirror device capable of suppressing generation of noise due to vibration of an electric motor while avoiding an increase in the number of parts and the number of steps in an assembly / molding process. The purpose is to do.

In order to achieve the above object, according to the first aspect of the present invention, the driving means including the electric motor is built in the actuator case so that the mirror holder for holding the mirror can be oscillated and driven. In the vehicle mirror device fixed in the housing, the brush-side bearing portions and the output-side bearing portions provided at both axial ends of the motor housing included in the electric motor are supported by the actuator case at least in two circumferential directions. The actuator case at a portion closer to the output-side bearing portion than the center between the brush-side bearing portion and the output-side bearing portion is opposed to the motor housing with a motor rotation axis in a direction crossing the electric motor. collision pair of supporting projections integrally to be disposed on both sides in contact to the motor housing It is the fact that to said.

According to the present invention, by only supporting the motor housing of the electric motor with the actuator case, it is possible to suppress the generation of noise due to vibration of the electric motor while avoiding an increase in the number of parts and the number of steps in the assembly / molding process. That is, according to the results of analysis and analysis of the vibration characteristics of the electric motor by the inventor, the vicinity of the contact portion of the commutator and the brush in the electric motor is the largest vibration source due to the collective arrangement of various parts and the separation of the contacts. Thus, the rotor is vibrated, and it has been found that the vibration near the both end bearing portions of the electric motor increases, and the periphery of the brush side bearing portion and the output side bearing portion provided at both end portions in the axial direction of the motor housing. The vibration part is reliably supported by supporting the actuator case at least two places in the direction, and the rotational reaction force received by the electric motor is at two places on the motor housing at the intermediate part between the brush side bearing part and the output side bearing part. Can be received by the actuator case, so there is no need to use a separate member from the actuator case. It become possible to suppress the generation of noise due to vibration of the motor.

In addition, the rotational reaction force received by the electric motor is received by the actuator case at the portion where vibration is lowest, so that the generation of noise due to the vibration of the electric motor can be suppressed and the rotational reaction force of the electric motor can be received. it can.

  Embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

  1 to 10 show an embodiment of the present invention, and FIG. 1 is a partially cutaway front view of a vehicle door mirror to which the present invention is applied, taken along line 1-1 in FIG. 2 is a cross-sectional view taken along the line 2-2 of FIG. 1, FIG. 3 is an enlarged front view of a part of the actuator case, FIG. 4 is an exploded perspective view of the actuator case and drive means, and FIG. 6 is an exploded perspective view of the actuator case and the driving means in a state where FIG. 6 is cut, FIG. 6 is a sectional view taken along line 6-6 in FIG. 3, FIG. 7 is a sectional view taken along line 7-7 in FIG. 9 is a cross-sectional view taken along the line 9-9 in FIG. 7 with the electric motor omitted, and FIG. 10 is a diagram showing an axial vibration distribution of the electric motor.

  First, in FIGS. 1 and 2, a base 15 is attached to a side door of a vehicle, and a mirror housing 16 made of synthetic resin can be rotated forward and backward of the vehicle so that the base 15 can be rotated. Supported.

  A bracket 17 made of synthetic resin is rotatably supported by the base 15, and the mirror housing 16 covering the bracket 17 is attached to the bracket 17 by a plurality of screw members 18. An opening edge of the mirror housing 16 is connected to a peripheral portion of a visor 19 that extends into the mirror housing 16 and is attached to the mirror housing 16, and a mirror 23 held by the mirror holder 20 is disposed on the rear side of the vehicle. It is arranged in the visor 19 so as to be visible.

  The mirror holder 20 includes a holder main portion 21 to which the mirror 23 is attached on the outer surface side, and an inner holder 22 fixed to the inner surface side of the holder main portion 21, and the mirror holder 20 is fixed to the bracket 17. The actuator case 24 is supported so that it can swing up and down and left and right.

  The mirror holder 20 is swingably supported by the actuator case 24 at an intersection point P of the first straight line LA extending in the vertical direction and the second straight line LB extending in the horizontal direction. A pair of first and second drive shafts 25A, 25B to be driven are projected from the actuator case 24 to be movable in the axial direction.

  In FIG. 3, the first drive shaft 25A has an axis perpendicular to the first straight line LA and is disposed below the intersection point P, and one end of the first drive shaft 25A is a first straight line. It is connected to the mirror holder 20 so as to be able to swing in a plane including LA, and the second drive shaft 25B has an axis perpendicular to the second straight line LB and is arranged outside the intersection P. One end of the second drive shaft 25B is connected to the mirror holder 20 so as to be able to swing in a plane including the second straight line LB.

  The actuator case 24 incorporates a first drive means 27A for driving the first drive shaft 25A in the axial direction and a second drive means 27B for driving the second drive shaft 25B in the axial direction.

  4 and 5, the actuator case 24 supports the case main body 34 made of synthetic resin for housing the first and second driving means 27A and 27B and the mirror holder 20 so as to be swingable. In addition, it comprises a synthetic resin lid member 35 that covers the case main body 34 from the mirror holder 20 side so that the first and second drive shafts 25A and 25B protrude.

  Referring also to FIG. 5, a cylindrical support shaft 37 is integrally projected on the outer surface of the lid member 35 so as to place an axis line at the intersection point P of the first and second straight lines LA and LB. In addition, a support seat surface 38 facing the mirror holder 20 as a circular arc in cross section is provided so as to surround the support shaft 37. On the other hand, the inner holder 22 of the mirror holder 20 is integrally provided with a receiving portion 39 slidably in contact with the support seat surface 38 having an arc shape in cross section, and the receiving portion 39 slides on the support seat surface. It is spring-biased on the contact side.

  In this way, the inner holder 22 that constitutes a part of the mirror holder 20 is supported by the lid member 35 of the actuator case 24 so as to be able to swing so that the receiving portion 39 is in sliding contact with the support seat surface 38. become.

  The first drive means 27A includes an electric motor 45A, a worm gear 46A provided on the output shaft of the electric motor 45A, and a worm wheel 47A meshing with the worm gear 46A and screwing with the first drive shaft 25A. .

  The worm wheel 47A is formed so as to surround the first drive shaft 25A coaxially and is rotatably supported by the case main body 34. On the other hand, a male screw 48 is engraved on the outer surface of the first drive shaft 25A, and a plurality of, for example, five arm portions 50 having inner teeth 49 to be screwed into the male screw 48 at the tip are provided in the circumferential direction or the like. It is integrally connected to the worm wheel 47A at an interval. Further, springs 53 are wound around all the arm portions 50... By the spring force of the springs 53, the internal teeth 49 at the tips of the arm portions 50 are screwed into the male threads 48 of the first drive shaft 25 </ b> A. The

  The second drive means 27B has an electric motor 45B, a worm gear 46B provided on the output shaft of the electric motor 45B, and a worm wheel 47B that meshes with the worm gear 46B and is screwed with the second drive shaft 25B. The first driving unit 27A is configured in the same manner.

Thus, a spherical head 54 provided at the tip of the first and second drive shafts 25A, 25B is a bearing portion provided in the inner holder 22 of the mirror holder 20.
One end portion of the moving shaft 25A is connected to the inner holder 22 of the mirror holder 20 so as to be prevented from rotating about its axis and to swing in a plane including the first straight line LA, and the second drive shaft 25B. One end portion of the mirror holder 20 is connected to the inner holder 22 of the mirror holder 20 so as to be prevented from rotating about its axis and to be able to swing in a plane including the second straight line LB.

  The first and second drive means 27A and 27B pass through the intersection point P of the first and second straight lines LA and LB and pass through the center between the first and second drive shafts 25A and 25B (see FIG. 3). Are accommodated in the case main body 34.

  A fitting wall portion 58 that is connected in an endless manner so as to surround the first and second driving means 27A and 27B is provided on the peripheral portion of the case main body 34 so as to protrude toward the lid member 35. The part is provided with an endless fitting groove 59 so that the fitting wall part 58 is fitted. Thus, the lid member 35 covering the case main body 34 so as to fit the fitting wall 58 in the fitting groove 59 is elastically engaged with the case main body 34 at a plurality of circumferential positions, for example, four places. That is, as shown in FIG. 6, the engaging claws 60 are projected at a plurality of, for example, four places spaced apart in the circumferential direction of the lid member 35. The corresponding portions are integrally provided with locking portions 62 formed in a gate shape so as to form locking holes 61 for elastically engaging the engaging claws 60.

  Cylindrical portions 63A and 63B for projecting the first and second drive shafts 25A and 25B are integrally projected on the lid member 35 toward the mirror holder 20, and the outer peripheral portions of the cylindrical portions 63A and 63B. Further, both ends of boots 64A and 64B surrounding the first and second drive shafts 25A and 25B are attached to the outer peripheral portions near the one ends of the first and second drive shafts 25A and 25B.

  On the outer peripheral portion of the case main body 34, a flange portion 65 projecting outward at a portion located between the worm wheels 47A, 47B in the first and second drive means 27A, 27B, and the first and second drive means 27A, 27B is provided with flanges 66, 67 projecting outward at portions located on the outer side of the electric motors 45A, 45B, and a collar 68 projecting on the opposite side of the collar 65.

  On the other hand, the lid member 35 is provided with flange portions 69, 70, 7172 that overlap with the flange portions 65-68, respectively, and the overlapping flange portions 65-68, 69-72 are screw members 73. Fastened to the bracket 17 respectively.

  7 to 9 together, the case main body 34 passes through the intersection P of the first and second straight lines LA and LB and passes through the center between the first and second drive shafts 25A and 25B. A partition wall 74 extending along PL (see FIG. 3) is provided, and includes a first housing recess 75A for housing the lower half of the electric motor 45A in the first drive means 27A, and an electric motor 45B in the second drive means 27B. A second housing recess 75 </ b> B that houses the lower half is formed in the case main body 34 so as to be positioned on both sides of the partition wall 74.

  By the way, at both ends of the motor housings 76 provided in the electric motors 45A and 45B, a cylindrical brush-side bearing portion 76a that supports the rotor shaft 83 on the side where the brush 77 (see FIG. 7) is disposed, and a worm gear 46A. 46B, a cylindrical output side bearing portion 76b for supporting the shaft 83 is provided, and a portion of the outer periphery of the motor housing 76 that faces the case main body 34 and the lid member 35 is provided with a case main body. The flat surfaces 76c and 76d that are close to and face the cover 34 and the lid member 35 are formed.

  Further, at least two locations in the circumferential direction of the brush-side bearing portions 76a, which are one end portions of the motor housings 76, are supported by the actuator case 24. In this embodiment, the brush-side bearing portions 76a ... The contact abutting portions 78 are in contact with the case main body 34, and the brush side bearing portions 76a are sandwiched between the support abutting portions 78 and the brush side bearing portions 76a. Are provided integrally with the motor housing 76, and the brush-side bearing portions 76a of the motor housings 76 are supported at two locations in the circumferential direction by the support abutting portions 78 and the support wall 79.

  At least two locations in the circumferential direction of the output side bearing portions 76b, which are the other ends of the motor housings 76, are supported by the actuator case 24. In this embodiment, the output side bearing portions 76b are fitted. The fitting recesses 80 are provided in the case main body 34, and the output-side bearing portions 76b are sandwiched between the lid member 35 and the closed ends of the fitting recesses 80. Are protruded from a wall portion 81 provided on the lid member 35 in parallel with the support wall 79, and two circumferential positions of the output side bearing portions 76b of the motor housings 76 are provided. Are supported by the closed ends of the fitting recesses 80 and the protrusions 81a.

  Further, at a portion corresponding to the intermediate position between the brush side bearing portion 76a and the output side bearing portion 76b, the motor housing 76 is disposed on both sides of the rotation axis of the electric motors 45A and 45B and protrudes from the actuator case 24. The pair of supporting protrusions 82, 82,... Are in contact with each other. In this embodiment, the pair of supporting protrusions 82, 82,. These supporting protrusions 82 are brought into contact with the flat surfaces 76d of the motor housings 76. In addition, the support protrusions 82, 82... Are in contact with the motor housing 76 at a portion closer to the output side bearing portion 76b than the center between the brush side bearing portions 76a and the output side bearing portions 76b. For example, it is desirable to project from 24 lid members 35.

  Next, the operation of this embodiment will be described. Brush-side bearing portions 76a and output-side bearing portions 76b provided at both ends in the axial direction of motor housings 76 provided in the electric motors 45A and 45B are at least two in the circumferential direction. Are supported by the actuator case 24 and are disposed on both sides of the rotation axes of the electric motors 45A and 45B in the motor housings 76 at portions corresponding to intermediate positions between the brush side bearing portions 76a and the output side bearing portions 76b. The pair of supporting protrusions 82, 82... Projecting from the lid member 35 in the actuator case 24 are brought into contact with each other.

  Therefore, only by supporting the motor housings 76 of the electric motors 45A and 45B with the actuator case 24, generation of noise due to vibrations of the electric motors 45A and 45B can be avoided while avoiding an increase in the number of parts and the number of steps in the assembly / molding process. Can be suppressed. That is, according to the results of analysis and analysis of the vibration characteristics of the electric motors 45A and 45B by the present inventor, the contact portions of the electric motors 45A and 45B near the contact portions of the commutators and the brushes 77 ... It has been found that the vibrations in the vicinity of both end bearing portions of the electric motors 45A and 45B increase because the vibration source becomes the largest vibration source, thereby causing the rotor to vibrate. The vibration part can be reliably supported by supporting at least two places in the circumferential direction of the provided brush side bearing parts 76a and output side bearing parts 76b to the actuator case 24, and the electric motors 45A and 45B. The rotational reaction force received by the motor housing is between the brush side bearing portion 76a and the output side bearing portion 76b. 76 is received by the actuator case 24, so that it is possible to suppress the generation of noise due to vibrations of the electric motors 45A and 45B without using a member different from the actuator case 24. It is.

  Moreover, the axial distribution of vibration generated in the electric motors 45A and 45B is as shown in FIG. 10, and is a portion closer to the output side bearing portion 76b than the central CP between the brush side bearing portions 76a and the output side bearing portions 76b. Then the vibration becomes the weakest. Therefore, the support protrusions 82, 82... Are brought into contact with the motor housings 76 at a point PP closer to the output side bearing portion 76 b than the center between the brush side bearing portions 76 a and output side bearing portions 76 b. As a result, the motor housing 76 is received by the actuator case 24 at the portion where the vibration is lowest, and the rotation of the electric motors 45A and 45B is suppressed while suppressing the generation of noise due to the vibration of the electric motors 45A and 45B. Can receive reaction force.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.

It is a partially cutaway front view of a vehicle door mirror, and is a view taken along line 1-1 in FIG. FIG. 2 is a sectional view taken along line 2-2 of FIG. It is a partially notched enlarged front view of an actuator case. It is a disassembled perspective view of an actuator case and a drive means. It is a disassembled perspective view of an actuator case and a drive means in the state which took out a drive means from an actuator case. FIG. 6 is a sectional view taken along line 6-6 of FIG. FIG. 7 is a sectional view taken along line 7-7 in FIG. 3. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 7. FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. 7 with the electric motor omitted. It is a figure which shows the axial direction vibration distribution of an electric motor.

DESCRIPTION OF SYMBOLS 19 ... Mirror housing 20 ... Mirror holder 23 ... Mirror 24 ... Actuator case 27A, 27B ... Drive means 45A, 45B ... Electric motor 76 ... Motor housing 76a ... Brush side Bearing portion 76b .. Output side bearing portion 82... Supporting protrusion

Claims (1)

The drive means (27A, 27B) including the electric motor (45A, 45B) is built in the actuator case (24) so that the mirror holder (20) holding the mirror (23) can be driven to swing. In the vehicle mirror device in which the case (24) is fixed in the mirror housing (19),
The actuator case (24) includes at least two brush-side bearing portions (76a) and output-side bearing portions (76b) provided at both axial ends of the motor housing (76) of the electric motor (45A, 45B) in the circumferential direction. )
The surface of the actuator case (24) facing the motor housing (76) at a portion closer to the output side bearing portion (76b) than the center between the brush side bearing portion (76a) and the output side bearing portion (76b). , said that the electric motor (45A, 45B) a pair of supporting projections are arranged in a direction transverse to the sides of the motor rotation axis abuts on the motor housing (76) (82) is integrally projecting vehicle mirror equipment, wherein.

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