JP4441441B2 - Mirror device for vehicle - Google Patents

Description

  The present invention relates to a vehicle mirror device provided in a vehicle.

  For example, a vehicle door mirror device includes a drive mechanism (storage mechanism) (see, for example, Patent Document 1), and the drive mechanism includes a stand. The stand is fixed to the vehicle body side, and a support shaft is integrally provided on the stand.

  The drive mechanism includes a case member, and the case member is rotatably supported on the support shaft. The case member is connected to a mirror for visually confirming the rear of the vehicle through a stay or the like, and the case member basically rotates integrally with the mirror.

  A motor base is fixed inside the case member, and a motor is fixed to the upper side of the motor base by a screw. The output shaft of the motor passes through the bottom wall of the motor base, and a worm gear is press-fitted into the output shaft below the motor base. The tip of the output shaft protrudes from the worm gear and is inserted into a bearing hole formed in the case member.

  Further, a helical gear is engaged with the worm gear, and when the helical gear is rotated by the rotation of the worm gear, a rotational force is applied to the support shaft, and the case member is rotated by a reaction force of the rotational force. Thus, the mirror is stored or erected.

However, in the vehicle door mirror device having the above-described configuration, as described above, the motor base to which the motor is fixed is fixed to the case member, and the tip end portion of the output shaft of the motor is supported by the case member. For this reason, there is a problem that a dimensional error or an assembly error between the motor base and the case member affects the axial accuracy of the output shaft, and the shaft shake occurs on the output shaft. Such shaft runout of the output shaft causes vibration hitting noise (noise / abnormal noise), and hinders the reduction of noise in the drive mechanism.
JP 2002-274267 A

  In view of the above fact, an object of the present invention is to obtain a vehicle mirror device capable of preventing or suppressing the shake of the output shaft of a motor.

First, a reference example will be described. A vehicle mirror device according to a reference example is rotatably supported by a support shaft fixed to the vehicle body side and is directly or indirectly connected to a vehicle rear view mirror, and the case member And the output shaft is pivotally supported by the case member, the driving force is transmitted to the support shaft through at least a first gear supported by the output shaft, and the case member is integrated with the mirror to the support shaft. And a motor that rotates around.

In the vehicle mirror device according to the reference example, when the motor is driven, the driving force of the motor is transmitted to the support shaft via the first stage gear supported by the output shaft of the motor, and the case member is supported by the support shaft together with the mirror. It is rotated around.

  Here, the motor is fixed to the case member, and the output shaft is pivotally supported by the case member. Therefore, it is possible to easily ensure the axis accuracy of the output shaft, thereby preventing or suppressing the shake of the output shaft.

The first stage gear may have a structure fixed to the output shaft of the motor, or a structure supported so as to be coaxial and rotatable relative to the output shaft of the motor (so-called “free fitting structure”). ]). As this loose fitting structure, the structure described in “Japanese Patent Application No. 2003-104982” already filed by the present applicant can be applied. This also applies to the invention according to claim 1 described later .

A vehicle mirror device according to a reference example is rotatably supported by a support shaft fixed to the vehicle body side and is directly or indirectly connected to a vehicle rear view mirror, and the case member And a motor that transmits a driving force to the support shaft via at least a first gear supported by the output shaft and rotates the case member around the support shaft integrally with the mirror. In the mirror device, the case member has bearing means for supporting the output shaft on both axial sides of the first stage gear.

In the vehicle mirror device according to the reference example, when the motor is driven, the driving force of the motor is transmitted to the support shaft via the first stage gear supported by the output shaft of the motor, and the case member is supported by the support shaft together with the mirror. It is rotated around.

  Here, the motor is fixed to the case member, and the output shaft is pivotally supported by bearing means provided on the case member. Therefore, it is possible to easily ensure the axis accuracy of the output shaft, thereby preventing or suppressing the shake of the output shaft.

  Moreover, the output shaft of the motor is pivotally supported by the case member on both sides in the axial direction of the first stage gear by the bearing means. Therefore, it is possible to prevent or suppress the occurrence of shaft runout on the output shaft due to the reaction force acting on the first gear from the support shaft side when the motor is driven (when the mirror is rotated).

Here, the vehicle mirror device according to the first aspect of the invention is rotatably supported by a support shaft fixed to the vehicle body side, and is directly or indirectly connected to a mirror for visually recognizing the rear of the vehicle. and the case member, Rutotomoni fixed body portion in said case member, a flange portion protruding radially concentrically intermediate portion of the output shaft provided in parallel with the output shaft relative to the support shaft A first-stage gear supported by the output shaft on the distal end side of the output shaft relative to the flange portion, a final gear supported coaxially and non-rotatably by the support shaft, and rotatable by the case member And the intermediate gear meshed with the first gear and the final gear, the case member can rotate the tip of the output shaft that penetrates the first gear. No. to pivot on It has a bearing portion, and a second bearing portion which rotatably supports the flange portion of the output shaft, and is characterized in that.

In the mirror device for a vehicle according to claim 1, when the motor is driven, together with the first-stage gear, which is supported by the output shaft of the motor rotates, the intermediate gear which is meshed with the first stage gear rotates. The intermediate gear is meshed with a final gear supported coaxially and in a relatively non-rotatable manner on a support shaft fixed on the vehicle body side. For this reason, the case member is rotated around the support shaft together with the mirror by the reaction force of the rotational force applied from the intermediate gear to the final gear (support shaft).

  Here, the motor is fixed to the case member, and the output shaft is pivotally supported by the first bearing portion and the second bearing portion provided in the case member. Therefore, it is possible to easily ensure the axis accuracy of the output shaft, thereby preventing or suppressing the shake of the output shaft.

In addition, the tip of the motor output shaft penetrating the first stage gear is pivotally supported by the first bearing portion of the case member, and the flange portion between the first stage gear and the motor body is the second bearing portion of the case member. Is pivotally supported. That is, since the output shaft of the motor is pivotally supported by the case member on both sides in the axial direction of the first gear, the output shaft is driven by the reaction force that acts on the first gear from the intermediate gear when the motor is driven (when the mirror rotates). It is possible to prevent or suppress the occurrence of shaft wobbling.

  Further, an intermediate gear meshed with the first gear is also supported by the case member. Therefore, it is possible to improve the axial accuracy (distance between the shafts and the axis of the shaft) between the first gear and the intermediate gear, and to ensure a good meshing state between the first gear and the intermediate gear. Thereby, it is possible to prevent the generation of abnormal noise (buzzing sound) due to the first stage gear receiving inflection (fluctuation due to radial force) from the intermediate gear.

The vehicle mirror device according to a second aspect of the present invention is the vehicle mirror device according to the first aspect , wherein the case member has a bottom wall formed in a stepped shape, and the upper portion of the bottom wall has the stepped portion. A motor main body is fixed, the second bearing is provided, and the first bearing is provided in a lower step of the bottom wall.

In the mirror device for a vehicle according to claim 2, the body portion of the motor is fixed to the upper portion of the bottom wall of the case member. A second bearing portion is provided on the upper portion of the bottom wall, and an intermediate portion of the output shaft is pivotally supported. Further, a first bearing portion is provided at the lower step portion of the bottom wall, and the tip end portion of the output shaft penetrating the first gear is pivotally supported. Thus, since the bottom wall of the case member is formed in a stepped shape, the first bearing portion and the second bearing portion are preferably arranged even if the motor is arranged in the vertical direction with respect to the case member. it can.

On the other hand, the vehicle mirror device according to the reference example is the vehicle mirror device according to claim 1 or 2 , wherein the second bearing portion is formed independently of a main body portion of the case member, The intermediate portion of the output shaft has a circular hole that is rotatably fitted and is a bearing member that is attached to the case member main body.

In the vehicle mirror device according to the reference example, the intermediate portion between the first stage gear and the motor main body of the motor output shaft is rotatably fitted in the circular hole of the bearing member. The bearing member is non-rotatably attached to the main body portion of the case member, whereby the intermediate portion of the output shaft is pivotally supported by the main body portion of the case member.

The vehicle mirror device according to the reference example, the prior SL output shaft has a flange portion projecting radially concentrically to the intermediate part, the second bearing portion is formed in the case member, the flange It is characterized in that the part is a bearing hole in which the part is rotatably fitted.

In the vehicle mirror device according to the reference example, the output shaft of the motor has a flange portion that protrudes concentrically in the radial direction at an intermediate portion thereof. The flange portion is rotatably fitted in a bearing hole formed in the case member, whereby the intermediate portion of the output shaft is pivotally supported by the case member.

  As described above, the vehicle mirror device of the present invention can prevent or suppress the shake of the output shaft of the motor.

< Reference example >
FIG. 9 is a front view showing a schematic configuration of a door mirror device 10 as a vehicle mirror device according to a reference example of the present invention.

  The “upper” and “lower” directionality used in the following description indicates the directionality when the door mirror device 10 is attached to the vehicle.

  The door mirror device 10 includes a mirror device body 12. The mirror device body 12 includes a visor 14, and a mirror 16 for viewing the vehicle rear is supported inside the visor 14.

  The door mirror device 10 includes a stay 18 fastened and fixed to a vehicle door panel (not shown), and a drive mechanism 20 is provided between the stay 18 and the mirror device body 12.

  Here, FIG. 8 shows an overall configuration of the drive mechanism 20 in a perspective view, and FIG. 7 shows an overall configuration of the drive mechanism 20 in an exploded perspective view (FIG. 8). Then, illustration of some structural members is omitted).

  As shown in these drawings, the drive mechanism 20 includes a stand 22, and the stand 22 is fixed to the stay 18, and the cylindrical support is integrally provided on the upper side of the fixed portion 24. A shaft 26 is provided.

  The drive mechanism 20 includes a case member 28, and the case member 28 includes a main body 30 and a cover 32 that is detachably attached to the main body 30. As shown in FIG. 6, the bottom wall of the main body portion 30 is formed in a stepped shape having an upper step portion 34 and a lower step portion 36. A through hole 37 (see FIG. 4) is formed in the lower step portion 36, and the support shaft 26 is rotatably inserted. In addition, a cylindrical support portion 38 protrudes from the bottom wall of the cover 32, and the support portion 38 is rotatably fitted to the tip end of the support shaft portion 26. As a result, the case member 28 is rotatably supported by the support shaft 26.

  As shown in FIG. 7, a detent plate 40 is disposed between the lower step portion 36 of the main body 30 and the fixing portion 24 of the stand 22, and the rotation range of the case member 28 relative to the support shaft 26 is predetermined. The range is limited.

  On the other hand, a gear plate 42 as a final gear is disposed inside the main body 30. The gear plate 42 is supported coaxially and rotatably on the support shaft 26.

  A clutch disk 44 is disposed on the side opposite to the lower step portion 36 of the case member 28 via the gear plate 42. The clutch disk 44 is coaxially supported by the support shaft 26 and is not rotatable with respect to the support shaft 26 and is movable in the axial direction. The clutch disc 44 has a convex portion that fits into a concave portion formed in the inner peripheral portion of the gear plate 42, and the clutch disc 44 and the gear plate 42 are only at a predetermined position along the circumferential direction. In meshing engagement.

  Further, a tea washer 46 is disposed on the side opposite to the gear plate 42 via the clutch disk 44. The tea washer 46 is attached to the tip of the support shaft 26 so as not to move in the axial direction.

  Further, a torsion coil spring 48 is disposed between the tea washer 46 and the clutch disk 44. The torsion coil spring 48 urges the clutch disc 44 in the direction of engagement with the gear plate 42. As a result, the meshing engagement state between the gear plate 42 and the clutch disk 44 is normally maintained, and the relative rotation of the gear plate 42 with respect to the support shaft 26 is restricted.

  Further, as shown in FIG. 5, a worm shaft 50 as an intermediate gear is provided on the radial side of the gear plate 42. As shown in FIG. 6, the worm shaft 50 is arranged with its axis A intersecting the axis B of the support shaft 26, and the worm gear portion 52 and the helical gear portion 54 meshed with the gear plate 42 are integrally formed. Have. The worm shaft 50 is rotatable about its own axis by supporting both ends in the axial direction on the main body 30 via the metal collar 56.

  Above the worm shaft 50, a gear CP support 58 formed in a U-shape is disposed. The gear CP support 58 is in contact with the metal collar 56 at both ends on the opening side (see FIG. 4). Further, a main body portion 62 of the motor 60 is disposed above the gear CP support 58, and the main body portion 62 is in contact with the upper end portion of the gear CP support 58. The main body 62 is fixed to the upper stage 34 of the main body 30 of the case member 28 by a screw 64 (see FIG. 3), and the gear CP support 58 is a fastening force of the main body 62 to the main body 30 by the screw 64. Thus, as shown in FIG. 2, both end portions on the opening side are pressed against the metal collar 56 (see arrow D). This prevents the metal collar 56 (worm shaft 50) from being lifted.

  Further, the output shaft 66 of the motor 60 is arranged in a state where the axis C thereof is parallel to the axis B of the support shaft 26 (a state intersecting the axis A of the worm shaft 50), as shown in FIG. The main body 30 is accommodated in a housing hole 68 having a substantially circular cross section formed from the upper step 34 to the lower step 36.

  The accommodation hole 68 opens to the worm shaft 50 side, and a worm gear 70 as a first-stage gear press-fitted and fixed to the output shaft 66 is exposed to the worm shaft 50 side. The worm gear 70 is meshed with the helical gear portion 54 of the worm shaft 50.

  Further, as shown in FIG. 1, the distal end portion of the output shaft 66 penetrates the worm gear 70 and protrudes downward, and the shaft can be freely rotated in a bearing hole 72 as a first bearing portion formed in the lower step portion 36. It is supported.

  Further, a bearing member 74 constituting the case member 28 is provided between the worm gear 70 and the main body 62 of the motor 60. The bearing member 74 is formed in a cylindrical shape, and an intermediate portion of the output shaft 66 is rotatably fitted in a circular hole 75 formed in the shaft center portion. The bearing member 74 is attached to the main body 30 by fitting to the upper end side of the accommodation hole 68 and holding the outer periphery on the support shaft 26 side on an arc-shaped holding surface formed on the gear CP support 58. Thus, the intermediate portion of the output shaft 66 is pivotally supported on the main body 30 by the bearing member 74. The bearing member 74 is preferably formed of a material having a small sliding resistance with the worm gear 70.

Next, the operation of this reference example will be described.

  In the door mirror device 10 configured as described above, the worm gear 70 and the worm shaft 50 (the worm gear portion 52 and the helical gear portion 54) are rotated by driving the motor 60, thereby being applied to the gear plate 42 of the support shaft 26. The case member 28 is rotated by the reaction force of the rotational force. For this reason, the mirror 16 is rotated integrally with the visor 14 and the case member 28 and stored or erected.

Here, in the door mirror device 10 according to the present reference example , the motor 60 is fixed to the main body 30 of the case member 28, and the output shaft 66 of the motor 60 has a tip portion that penetrates the worm gear 70 at the main body of the case member 28. The intermediate portion between the worm gear 70 and the main body portion 62 of the motor 60 is supported by the main body portion 30 of the case member 28 via the bearing member 74.

  Thus, since the output shaft 66 is pivotally supported by the main body portion 30 of the case member 28 to which the main body portion 62 of the motor 60 is fixed, it is possible to easily ensure the axial accuracy of the output shaft 66. Thereby, it is possible to prevent or suppress the occurrence of shaft runout in the output shaft 66.

  By the way, in the drive mechanism of the conventional vehicle door mirror device, the output shaft of the motor has a configuration (cantilever structure) in which only the tip portion (one end side in the axial direction of the worm gear) is supported, so that the helical gear acts on the worm gear. There is a problem that the output shaft is shaken by the reaction force.

In this respect, in the door mirror device 10 according to the present reference example , as described above, the output shaft 66 of the motor 60 is pivotally supported by the case member 28 on both sides of the worm gear 70 in the axial direction. The reaction force (see arrow E in FIG. 1) acting on the worm gear 70 from the worm shaft 50 (helical gear portion 54) during rotation can be received on both sides in the axial direction of the worm gear 70 (see arrow F in FIG. 1). Thereby, it is possible to prevent or suppress the occurrence of shaft runout in the output shaft 66. Therefore, generation of vibration hitting sound due to shaft runout of the output shaft 66 is prevented or suppressed, and noise reduction of the drive device 20 is realized.

FIG. 10 is a diagram showing the relationship between the noise level and the frequency of the operating sound in a conventional door mirror device (a door mirror device having a cantilever motor output shaft) and the door mirror device 10 according to this reference example . Yes.

  As can be seen from FIG. 10, in the door mirror device 10, the sound pressure of all frequency components is significantly reduced and the operating noise is reduced by about 30% compared to the conventional door mirror device.

Further, in the door mirror device 10 according to the present reference example , each gear (worm gear 70, worm shaft 50, gear plate 42) is attached on the basis of the main body 30 of the case member 28 (all gears are the main body 30). As a result, the shaft accuracy (distance between shafts, shaft center) of each gear is improved, and the worm shaft 50 (second stage gear) and beyond are subject to inflection (variation due to radial force). It is difficult and no abnormal noise (growing sound) is generated.

11 shows the relationship between the abnormal noise and time during operation of a conventional door mirror device (door mirror device has an output shaft of the motor is single structure) is shown in the diagram, in Figure 12, the reference The relationship between abnormal noise and time during operation of the door mirror device 10 according to the example is shown in a diagram.

  From FIG. 11, it can be seen that the conventional door mirror device generates abnormal noise (growing sound) (see the wavy line in FIG. 11). This is because the first gear (worm gear) receives inflection (fluctuation) from the second gear (worm shaft). On the other hand, as shown in FIG. 12, in the door mirror device 10, each gear is integrated into one part of the main body 30, and the output shaft 66 is pivotally supported at both ends in the axial direction of the worm gear 70. It can be seen that no abnormal noise occurs.

Furthermore, with the door mirror device 10 according to the present reference example , the configuration as described above reduces the load power of the motor 60 by about 10% and reduces the variation in operating noise by about 50%, for example.

Furthermore, in the door mirror device 10 according to the present reference example , each component is assembled with the main body 30 of the case member 28 as a reference, so that, for example, the number of parts is reduced by about 20% and the weight is reduced by about 10%. In addition, the assembly man-hour can be reduced by about 10%.

Further, in the door mirror device 10 according to the present reference example , all parts except the parts supported by the stand 22 can be assembled in one direction from directly above with respect to the main body 30 of the case member 28, so that the assemblability is good. Productivity is greatly improved.

In addition, in the door mirror device 10 according to the present reference example , the bottom wall of the case member 28 (main body portion 30) is formed in a stepped shape, so that the motor 60 is arranged in the vertical direction with respect to the case member 28. Also, the bearing hole 72 (first bearing portion) and the bearing member 74 (second bearing portion) can be suitably arranged.

As described above, in the door mirror device 10 according to the present reference example , the shaft shake of the output shaft 66 of the motor 60 can be prevented or suppressed.

In the door mirror device 10 according to the reference example described above, the worm gear 70 as the first stage gear is press-fitted and fixed to the output shaft 66 of the motor 60. A structure (so-called “free fitting structure”) that is supported coaxially and rotatably at a predetermined angle may be employed. As this loose fitting structure, the structure described in “Japanese Patent Application No. 2003-104982” already filed by the present applicant can be applied. Thus, when the output shaft of the motor and the first-stage gear have a loose fitting structure, it is possible to more effectively suppress the shake of the output shaft.
<Implementation of the form>
Next, a description will be given implementation of the present invention. Note that above for Reference Example basically the same configuration and operation, and applying the reference example and the same reference numerals, and description thereof is omitted.

Figure 13 shows a configuration of peripheral members including a motor 82 of the door mirror device 80 as vehicle mirror device according to the implementation of the embodiment of the present invention is shown in a sectional view.

The door mirror device 80 has basically the same configuration as the door mirror device 10 according to the reference example , but in this door mirror device 80, the output shaft 84 of the motor 82 is between the worm gear 70 and the main body 86 of the motor 82. A flange portion 88 that protrudes concentrically in the radial direction is provided at the intermediate portion. The flange portion 88 is rotatably supported by an upper end portion of the accommodation hole 68 of the main body portion 30 and a gear CP support 58 (not shown in FIG. 13). That is, in the door mirror device 80, the upper end portion of the accommodation hole 68 and the gear CP support 58 constitute a bearing hole as a second bearing portion.

The door mirror device 80 configured as described above has basically the same operations and effects as the door mirror device 10 according to the reference example .

It is sectional drawing which shows the structure of the peripheral member containing the motor of the mirror apparatus for vehicles which concerns on the reference example of this invention. It is sectional drawing which shows the structure of the peripheral member containing the motor of the mirror apparatus for vehicles which concerns on the reference example of this invention. It is a perspective view which shows the attachment state of the motor to the main-body part of the case member of the mirror apparatus for vehicles which concerns on the reference example of this invention. It is a perspective view which shows the attachment state of the intermediate gear to the main-body part of the case member of the mirror apparatus for vehicles which concerns on the reference example of this invention. It is a top view which shows the attachment state of the intermediate | middle gear and the last gear to the main-body part of the case member of the mirror apparatus for vehicles which concerns on the reference example of this invention. It is a perspective view which shows the structure of the main-body part of the case member of the mirror apparatus for vehicles which concerns on the reference example of this invention. It is a disassembled perspective view which shows the structure of the drive mechanism of the mirror apparatus for vehicles which concerns on the reference example of this invention. It is a perspective view which shows the structure of the drive mechanism of the mirror apparatus for vehicles which concerns on the reference example of this invention. It is a front view which shows schematic structure of the mirror apparatus for vehicles which concerns on the reference example of this invention. It is a diagram which shows the relationship between the noise level of the operating sound in a vehicle mirror apparatus which concerns on the reference example of this invention, and the conventional door mirror apparatus, and a frequency. It is a diagram which shows the relationship between noise and time at the time of the action | operation of the conventional door mirror apparatus. It is a diagram which shows the relationship between noise and time at the time of the action | operation of the vehicle mirror apparatus which concerns on the reference example of this invention. It is a sectional view showing the configuration of peripheral members including a motor vehicle mirror device according to the implementation of the embodiment of the present invention.

Explanation of symbols

10 Door mirror device (vehicle mirror device)
16 Mirror 26 Support shaft 28 Case member 30 Main body portion 34 of case member Upper step portion 36 Lower step portion 42 Gear plate (final gear)
50 Worm shaft (intermediate gear)
60 Motor 62 Motor body 66 Output shaft 68 Housing hole 70 Worm gear (first gear)
72 Bearing hole (first bearing part, bearing means)
74 Bearing member (second bearing portion, bearing means)
75 circular hole 80 vehicle mirror device 82 motor 84 output shaft 86 motor body 88 flange

Claims (2)

A case member that is rotatably supported by a support shaft fixed to the vehicle body side and is directly or indirectly connected to a mirror for rearward visual recognition of the vehicle;
A motor in which a main body is fixed to the case member in a state where an output shaft is parallel to the support shaft, and a flange portion that is concentrically protruding in a radial direction is provided at an intermediate portion of the output shaft;
A first stage gear supported by the output shaft on the tip side of the output shaft from the flange portion;
A final gear supported coaxially and non-rotatably on the support shaft;
An intermediate gear that is rotatably supported by the case member and meshed with the first gear and the final gear;
In a vehicle mirror device comprising:
The case member is
A first bearing portion that rotatably supports the tip end portion of the output shaft that has passed through the first stage gear;
A second bearing portion that rotatably supports the flange portion of the output shaft;
A vehicle mirror device characterized by comprising: In the case member, a bottom wall is formed in a stepped shape, the motor main body is fixed to an upper step portion of the bottom wall and the second bearing portion is provided, and the first bearing is provided in a lower step portion of the bottom wall. The vehicle mirror device according to claim 1, further comprising a portion .

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