JP4333607B2 - Electric retractable door mirror drive structure - Google Patents

Description

  The present invention relates to a drive structure for an electric retractable door mirror provided with a rotation mechanism for rotating a mirror housing between a storage position and a use position.

  2. Description of the Related Art Conventionally, an electric retractable door mirror that rotates a mirror housing between a storage position and a use position is known (see Patent Document 1).

  Such an electric retractable door mirror has a worm gear and a rotation mechanism for rotating the mirror housing between a storage position and a use position, a drive motor for rotating the worm gear, a drive shaft of the drive motor, and rotation of the worm gear. And a joint member that connects one end of the shaft.

  The joint member is formed in a cylindrical shape, slits are formed at both ends thereof, a flat drive shaft is inserted into one slit, and a flat rotation shaft is inserted into the other slit. And if the drive shaft of a drive motor rotates, a rotation shaft will rotate with a worm gear via a joint member.

  However, since the joint member has slits at both ends, there is a problem in strength.

  Therefore, as shown in FIGS. 13 and 14, a joint member 1 formed in a cylindrical shape to increase the strength has been proposed.

In the hole 2 of the joint member 1, a pair of opposed protrusions 3, 3 having a substantially triangular cross section along the axis are formed. As shown in FIGS. 15 and 16, the drive shaft 4 of the motor M and the rotating shaft 5 a of the worm gear 5 are inserted into the hole 2. The drive shaft 4 and the rotary shaft 5a are flattened and press-fitted between the protrusions 3 and 3, and are not allowed to tilt in the flat direction with respect to the joint member 1, but are orthogonal to the flat direction. Some tilting is allowed in the direction of movement.
Japanese Utility Model Publication No. 5-58485

  For this reason, as shown in FIG. 17, when the motor M is assembled to the plate 6 with the axis 4a of the motor M slightly tilted to the right with respect to the axis 6a of the plate 6, the drive shaft 4 of the motor M is For example, when the drive shaft 4 reaches the position shown in FIG. 18 (the position in the direction in which the flattening direction of the drive shaft and the inclination of the motor M are orthogonal) by rotating, the joint member 1 is orthogonal to the flattening direction of the drive shaft 4. Since the inclination of the direction can be allowed, the inclination of the motor M is absorbed by the joint member 1. At this time, since the joint member 1 can also absorb the inclination in the direction perpendicular to the flat direction with respect to the worm gear 5, the worm gear 5 rotates with its axis line coincident with the axis line 6a of the plate 6 as shown in FIG. The worm gear 5 is not strongly pressed against the plate 6 and the worm gear 5 and the plate 6 do not interfere with each other.

  However, when the drive shaft 4 of the motor M is rotated to the position shown in FIGS. 15 and 16 (the position where the tilt direction of the motor M and the flat direction of the drive shaft 4 coincide) (when rotated 90 degrees from FIG. 18). ) Since the joint member 1 cannot tolerate the inclination of the drive shaft 4 in the same direction as the flat direction, the joint member 1 is inclined together with the inclination of the motor M as shown in FIG. At this time, since the joint member 1 cannot absorb the inclination in the flat direction with respect to the worm gear 5, the worm gear 5 also tilts in the same direction together with the joint member 1.

  For this reason, the worm gear 5 is strongly pressed against the plate 6, and the worm gear 5 and the plate 6 interfere strongly.

  As described above, strong interference and no interference occur twice with respect to one rotation of the motor M, and thus there is a problem that blurring noise is generated.

  An object of the present invention is to provide a drive structure for an electric retractable door mirror that can prevent the occurrence of blurring noise.

In order to achieve the above object, the invention of claim 1 includes a rotation mechanism that has a worm and rotates the mirror housing to the storage position and the use position, and the rotation mechanism drives the worm to rotate. A drive motor, and a joint member for connecting the drive shaft of the drive motor and one end of the rotary shaft of the worm. The drive motor is attached to a plate provided in a mirror housing, and is connected to the rotary shaft of the worm. The drive structure of the electric retractable door mirror whose one end is rotatably held by the plate,
Forming a first insertion hole for inserting the drive shaft in one end face of the joint member, and forming a second insertion hole for inserting one end of the rotating shaft in the other end face;
Flattening the drive shaft and the rotation shaft,
A pair of opposed first protrusions that abut against the flat surface of the drive shaft are provided in the first insertion hole,
A pair of opposed second protrusions that contact the eccentric surface of the rotating shaft are provided in the second insertion hole,
Inserting the drive shaft into the first insertion hole and press-fitting between the pair of first protrusions;
Inserting the rotary shaft into the second insertion hole and press-fitting between the pair of second protrusions;
The angle formed by the applanation direction of the drive shaft and the applanation direction of the rotary shaft is approximately 90 degrees.

  The invention according to claim 2 is characterized in that the rotation shaft is rotatable relative to the first insertion hole by a predetermined angle.

  According to this invention, even if the drive motor is assembled with being inclined with respect to the plate, it is possible to prevent the generation of blurring noise when driving the drive motor.

  Hereinafter, an embodiment which is an embodiment of an electric retractable door mirror to which the drive structure of the electric retractable door mirror according to the present invention is applied will be described with reference to the drawings.

  An electric retractable door mirror 10 shown in FIG. 1 includes a mirror base 11 fixed to an automobile door (not shown), a shaft holder 20 fixed to the mirror base 11 and having a hollow shaft 21 (see FIG. 2). ), And a mirror assembly 30 mounted on the shaft 21 so as to be rotatable.

  The mirror assembly 30 includes a unit bracket 31 that is rotatably supported by the shaft 21, a mirror housing 32 and a power unit 33 that are fixed to the unit bracket 31, a tiltable attachment to the power unit 33, and a front opening of the mirror housing 32. And a mirror 34 disposed on the surface.

  The mirror assembly 30 can be moved to a front tilt position P1, a rear tilt position (storage position) P2, and a use position P3 which is an intermediate position by a built-in rotation mechanism 40.

  The rotation mechanism 40 includes a clutch mechanism 41, a speed reduction mechanism 50, and a motor (drive motor) 60.

  As shown in FIG. 2, the clutch mechanism 41 includes a push nut 42, a compression spring 43, a clutch gear 44, a clutch holder 45, a washer 46, and the like attached to the shaft 21 of the shaft holder 20. The clutch mechanism 41 is used to manually rotate the mirror assembly 30 or to rotate the mirror assembly 30 for buffering when something hits the mirror assembly 30. The mechanical coupling with the 21 is cut off.

  The clutch mechanism 41 is disposed in a case 47 shown in FIG. 2, and the case 47 is rotatably attached to the shaft holder 20.

  The speed reduction mechanism 50 includes a worm (first worm) 51 attached to a drive shaft 61 of the motor 60 via a joint member 70 described later, a worm wheel (first worm wheel) 52 meshing with the worm 51, and a D-cut. A worm (second worm) 54 in which one end of the rotary shaft 53 is axially movable in the center hole of the worm wheel 52 by a surface 53a and is non-rotatably mounted, and a second worm wheel meshing with the worm 54 (see FIG. (Not shown).

  The speed reduction mechanism 50 is disposed in the case 47, and the motor 60 is attached to the plate 71 as shown in FIG. The plate 71 is mounted in the case 47, and a cover case 80 is mounted on the case 47.

  Note that the clutch mechanism 41 and the speed reduction mechanism 50 have the same configuration as that of the prior art, and a detailed description thereof will be omitted.

  A circuit board 81 provided with a drive circuit for driving the motor 60 is attached to the plate 71.

  The plate 71 is formed with a cylindrical portion 72 to which the motor 60 is attached. A small-diameter cylindrical portion 73 is formed below the cylindrical portion 72, and the joint member 70 is disposed in the cylindrical portion 73. A shaft hole 74 is formed in the bottom wall portion 73A of the cylindrical portion 73, and an upper portion (in FIG. 3) of the rotating shaft 51A of the worm 51 is rotatably held in the shaft hole 74, and a lower portion 51B of the rotating shaft 51A. (In FIG. 3) is rotatably held in a shaft hole 47H provided in the case 47.

  The upper part 51 b of the rotating shaft 51 A is flattened, and the upper part 51 b enters the cylindrical part 73 of the plate 71.

  As shown in FIGS. 4 to 6, the joint member 70 has a cylindrical main body 76, and an upper surface (one end surface) 76A and a lower surface (other end surface) 76B (in FIG. 5) of the main body 76 are axially arranged. Shaft holes 77 and 78 extending in the direction are formed. The shaft hole (first insertion hole) 77 is formed with a pair of protrusions (first protrusions) 77A and 77A that are opposed to each other along the axial direction, and the protrusions 77A and 77A are viewed in plan view. It is almost triangular. Similarly, the shaft hole (second insertion hole) 78 is formed with a pair of protrusions (second protrusions) 78A and 78A facing each other along the axial direction, and the protrusions 78A and 78A are viewed in plan view. Is almost triangular.

  Further, the direction in which the ridges 77A and 77A oppose each other and the direction in which the ridges 78A and 78A oppose each other are shifted by approximately 90 degrees as shown in FIGS.

  As shown in FIGS. 7 and 8, the drive shaft 61 of the motor 60 is inserted into the shaft hole 77 of the joint member 70. The drive shaft 61 is flattened and press-fitted between the protrusions 77A and 77A of the shaft hole 77. Due to this press-fitting, the drive shaft 61 cannot be allowed to tilt in the left-right direction (X direction) in FIG. 7 with respect to the joint member 70, and is somewhat in the vertical direction (Y direction in FIG. 7). Only tilting of is allowed.

  Further, the upper portion 51 b of the rotating shaft 51 </ b> A of the worm 51 is inserted into the shaft hole 78 of the joint member 70 and is press-fitted between the protrusions 78 </ b> A and 78 </ b> A of the shaft hole 78. With this press-fitting, the rotating shaft 51A of the worm 51 is allowed only a slight tilt in the left-right direction (X direction) in FIG. 8 (B) is not allowed to tilt in the Y direction).

The motor 60, the joint member 70, the plate 71, the worm 51, and the like constitute a drive structure for the electric retractable door mirror 10.
[Operation]
Next, the operation of the electric retractable door mirror 10 configured as described above and the operation of the drive structure of the electric retractable door mirror 10 will be described.

  When the motor 60 is driven, the mirror assembly 30 is pivotally moved around the shaft 21 of the mirror base 11 via the speed reduction mechanism 50 and the clutch mechanism 41, and the predetermined forward tilt position P1 and rearward tilt shown in FIG. It is moved to position P2 or use position P3. Since the rotational movement of the mirror assembly 30 is performed in the same manner as in the prior art, the description thereof is omitted.

  For example, as shown in FIG. 9, when the motor 60 is assembled with an inclination with respect to the cylindrical portion 73 of the plate 71, that is, the axis 60 </ b> J of the motor 60 is directed to the right ( When the drive shaft 61 of the motor 60 is rotated to the position shown in FIG. 7, the drive shaft 61 is not allowed to tilt in the X direction with respect to the joint member 70. The joint member 70 is inclined together with the drive shaft 61 as shown in FIG.

  On the other hand, as shown in FIG. 8 (B), the rotation shaft 51A of the worm 51 has the protrusions 78A and 78A of the shaft hole 78 of the joint member 70 located in the Y direction. Although not allowed, tilting in the X direction is allowed. Therefore, the joint member 70 tilts with respect to the rotation shaft 51A of the worm 51 as shown in FIG. 9, and the rotation shaft 51A of the first worm 51 is strongly pressed against the shaft hole 74 of the cylindrical portion 73 of the plate 71, Strong interference between the worm 51 and the plate 71 is prevented.

  When the drive shaft 61 of the motor 60 is rotated to the position shown in FIG. 10, that is, 90 degrees from the position shown in FIG. 7, the protrusions 77A and 77A of the shaft hole 77 of the joint member 70 are positioned in the Y direction. Therefore, the drive shaft 61 is allowed to tilt in the X direction with respect to the joint member 70. Therefore, as shown in FIG. 11, the drive shaft 61 of the motor 60 tilts with respect to the joint member 70, and the joint member 70 does not tilt with respect to the cylindrical portion 73 of the plate 71.

  For this reason, the rotating shaft 51A of the worm 51 is strongly pressed against the shaft hole 74 of the cylindrical portion 73 of the plate 71, and strong interference between the worm 51 and the plate 71 is prevented.

  In this way, even when the motor 60 is assembled with an inclination with respect to the plate 71, the worm 51 and the plate 71 are prevented from strongly interfering with each other. Occurrence can be prevented. Further, since the effect of absorbing the axial displacement of the motor 60 with respect to the joint member 70 is increased, it is not necessary to increase the dimensional accuracy of the plate 71 and the worm 51, and thus the cost can be reduced.

  By the way, the drive shaft 61 of the motor 60 can idle by a predetermined angle within the joint member 70 as shown in FIGS. 12 (A) and 12 (B). For this reason, when the reversal operation is performed after the operation, the drive shaft 61 of the motor 60 idles for a moment. An angular velocity is generated in the rotor of the motor 60 due to the idling, and the worm 51 can be rotated with the momentum of the angular velocity.

  For this reason, when the gear part of the worm 51 and the worm wheel 52 is biting, the force required when canceling this can be obtained.

It is explanatory drawing which showed the Example of the electric retractable door mirror to which the drive structure of the electric retractable door mirror which concerns on this invention was applied. It is the disassembled perspective view which showed the principal part of the electric retractable door mirror shown in FIG. It is sectional drawing which showed the one part assembly | attachment of the motor and the deceleration mechanism. It is the top view which showed the joint member. It is sectional drawing which showed the joint member. It is a bottom view of a joint member. It is explanatory drawing which showed the joint state of the joint member and the rotating shaft of a motor. (A) is sectional drawing which showed the state which couple | bonded the rotating shaft and worm of the motor with the joint member, (B) is explanatory drawing which showed the coupling | bonding state of the joint member and the rotating shaft of a worm. It is explanatory drawing which showed the state in which the motor inclined and assembled | attached with respect to the cylindrical part of a plate. It is explanatory drawing which showed the state when the rotating shaft of a motor rotated to the predetermined position. It is explanatory drawing which showed the state which a joint member does not tilt with respect to the cylindrical part of a plate. (A) is explanatory drawing which showed that the rotating shaft of a motor idle | rotates to one direction within a joint member, (B) is the description which showed that the rotating shaft of the motor idly rotated to another direction within a joint member. FIG. It is sectional drawing which showed the structure of the conventional joint member. It is a top view of the joint member of FIG. It is explanatory drawing which showed the state when the drive shaft of a motor rotated to the predetermined position. It is explanatory drawing which showed the relationship between the drive shaft of a motor, a joint member, and the rotating shaft of a worm. It is explanatory drawing which showed the state in which the joint member and the worm inclined by the inclination of the motor. It is explanatory drawing which showed the state when the direction orthogonal to the inclination of a motor and the flat direction of the drive shaft of a motor corresponded. It is explanatory drawing which showed the state by which the inclination of the motor was absorbed by the joint member.

Explanation of symbols

51 Warm 51A Rotating shaft 51b One end 60 Motor 61 Drive shaft 70 Joint member 71 Plate 77 Shaft hole 78 Shaft hole

Claims (2)

A rotation mechanism having a worm and rotating the mirror housing between a storage position and a use position is provided. The rotation mechanism includes a drive motor that rotates the worm, a drive shaft of the drive motor, and a drive shaft of the worm. And a joint member that connects one end portion of the rotating shaft, the drive motor is attached to a plate provided in the mirror housing, and the one end portion of the rotating shaft of the worm is electrically held by the plate rotatably. Type door mirror drive structure,
Forming a first insertion hole for inserting the drive shaft in one end face of the joint member, and forming a second insertion hole for inserting one end of the rotating shaft in the other end face;
Flattening the drive shaft and the rotation shaft,
A pair of opposed first protrusions that abut against the flat surface of the drive shaft are provided in the first insertion hole,
A pair of opposed second protrusions that contact the eccentric surface of the rotating shaft are provided in the second insertion hole,
Inserting the drive shaft into the first insertion hole and press-fitting between the pair of first protrusions;
Inserting the rotary shaft into the second insertion hole and press-fitting between the pair of second protrusions;
The drive structure of the electric retractable door mirror characterized in that an angle formed by the applanation direction of the drive shaft and the applanation direction of the rotary shaft is approximately 90 degrees. The drive structure of the electric retractable door mirror according to claim 1, wherein the rotation shaft is rotatable relative to the first insertion hole by a predetermined angle.

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