JPH0558485U - Electric retractable door mirror - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide an electric retractable door mirror capable of efficiently exhibiting the original performance of the motor 13. [Configuration] Shaft 130 of Motor 13 and Reduction Mechanism 24
Of the worm 25 and a clearance C4 capable of transmitting the rotation and torque of the motor 13 to the worm 25,
Joints are made by joint members 810, 820, 830, 840, 850 having C5, C6, C7, C8, C9. As a result, the rotation and torque of the motor 13 can be transmitted to the worm 25, while the reduction mechanism 24
The thrust load and the radial load acting on the worm 25 are not applied to the shaft 130 side of the motor 13. Therefore, the original performance of the motor 13 can be efficiently exhibited. In particular, the reverse activation performance can be improved. Further, the shaft 130 of the motor 13 and the reduction mechanism 24
The eccentricity error with respect to the worm 25 can be allowed.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to, for example, an electric retractable door mirror mounted on a door of an automobile, and particularly, the thrust load and the radial load acting on the worm of the reduction mechanism are not applied to the shaft side of the motor, so that the original performance of the motor can be improved efficiently. The present invention relates to an electric retractable door mirror that can be exhibited well.

[0002]

[Prior Art]

 A conventional electric retractable door mirror is generally a mirror base fixed to a vehicle body, for example, an automobile door, a shaft implanted in the mirror base, a mirror assembly rotatably supported on the shaft, and the mirror. A motor built in the assembly and a reduction mechanism and a clutch mechanism arranged between the motor and the shaft are provided. By driving the motor, the mirror assembly is rotationally displaced with respect to the mirror base between a use position and a storage position. In such an electric retractable door mirror, an electric retractable door mirror (Japanese Patent Laid-Open No. 62-50249) that uses a reduction mechanism composed of a worm gear or the like is first applied in order to increase the reduction ratio of the reduction mechanism. Has been done.

[0003]

[Problems to be solved by the device]

 However, in the conventional electric retractable door mirror described above, the shaft of the motor and the worm of the reduction mechanism are directly connected, so the thrust load and radial load acting on the worm of the reduction mechanism are applied to the shaft side of the motor. In addition, there is a problem that the original performance of the motor cannot be efficiently exhibited.

An object of the present invention is to provide an electric retractable door mirror capable of efficiently exhibiting the original performance of the motor without the thrust load and the radial load acting on the worm of the reduction gear mechanism being applied to the shaft side of the motor. To provide.

[0005]

[Means for Solving the Problems]

 The present invention is characterized in that the shaft of the motor and the worm of the reduction mechanism are jointed by a joint member having a clearance capable of transmitting rotation and torque of the motor to the worm.

[0006]

[Action]

 According to the present invention, the rotation and torque of the motor can be transmitted to the worm by the above configuration. Moreover, due to the clearance of the joint member that joins the shaft of the motor and the worm of the reduction mechanism, the thrust load and radial load acting on the worm of the reduction mechanism are not applied to the shaft side of the motor. Therefore, the original performance of the motor can be efficiently exhibited. In particular, it is possible to improve the reverse startup performance. Further, it is possible to allow an eccentricity error between the shaft of the motor and the worm of the reduction mechanism.

[0007]

【Example】

 Hereinafter, an embodiment of an electric retractable door mirror according to the present invention will be described with reference to the accompanying drawings. In FIG. 3, reference numeral 1 denotes a mirror base fixed to a vehicle body, for example, an automobile door (not shown). In FIG. 4, reference numeral 2 denotes a shaft holder that is fixed to the mirror base 1. A hollow shaft 3 is integrally projectingly provided on the shaft holder 2, and a chamfered portion 4 for preventing rotation is provided on the shaft 3. An engagement groove 5 is provided in the circumferential direction at the upper end of the shaft 3. A pair of arcuate grooves 6 are provided on the fixed surface of the upper surface of the shaft holder 2 along an arc locus of a ball 12 incorporated in a mirror assembly 7 described later. As shown in FIG. 10, the arcuate groove 6 has a stepped portion 60 on the use position side and a stepped portion 61 on the storage position side with a height H cut up at right angles at both ends thereof. The bottom surface of the above-mentioned arcuate groove 6 may be smooth, and may be gently convex upward as shown by the chain double-dashed line in FIG. 10, for example. In FIG. 3, reference numeral 7 denotes a mirror assembly. The mirror assembly 7 includes a unit bracket 8 rotatably supported on the shaft 3, a mirror housing 9 and a power unit 10 fixed to the unit bracket 8, and a power unit 10. The mirror 11 is mounted so as to be tiltable vertically and horizontally, and is provided in the front opening of the mirror housing 9. Two hemispherical recesses are respectively provided at positions on the lower surface of the unit bracket 8 that face the pair of arcuate grooves 6 of the shaft holder 2, and the two recesses are provided with two hemispherical recesses. The balls 12 are fitted so as to be rollable. When the ball 12 hits the step portion 60 on the use position side as shown by the solid line in FIG. 10, the mirror assembly 7 is in a state of protruding laterally from the vehicle body as shown by the solid line in FIG. Located in use position. When the ball 12 is hitting the stepped portion 61 on the storage position side as shown by the one-dot chain line in FIG. 10, the mirror assembly 7 moves along the vehicle body as shown by the one-dot chain line in FIG. It is located at the storage position in a state of being tilted rearward. Further, when the ball 12 rides on the arcuate groove 6 in the direction of arrow A and is positioned on the fixed surface of the shaft holder 2 as shown by the chain double-dashed line in FIG. As shown by the chain double-dashed line in FIG. 3, the shock absorber is tilted forward along the vehicle body. The steps 60 and 61 and the balls 12 at both ends of the arcuate groove 6 constitute a stopper that physically and forcibly stops the mirror assembly 7 as a moving body at a predetermined stop position. .. Further, the height H of the stepped portions 60 and 61 of the arcuate groove 6 and the ball 12 serve as a stopper that is not ridden by the torque of the motor 13, which will be described later, but is ridden by manual operation or buffer rotation. In FIG. 6, reference numerals 22 and 23 denote semi-circular grooves formed on the fixed surface of the upper surface of the shaft holder 2 and on the rotating surface of the lower surface of the unit bracket 8, and the projection 22 is the groove. 23 is slidably fitted to the mirror 23 and serves as a guide for rotational displacement of the mirror assembly 7 with respect to the shaft 3 (shaft holder 2). In FIG. 7, reference numeral 14 denotes a plate fixed to the unit bracket 8, a recess 140 for bearing and thrust force is provided in the middle of the plate 14, and a through hole 141 is provided at the bottom of the recess 140. On the other hand, a recess 80 for bearing and thrust force reception is provided at a position facing the recess 140 of the unit bracket 8. In FIG. 7, reference numeral 13 denotes a motor built in the mirror assembly 7, and the motor 13 is fixed to the plate 14 fixed to the unit bracket 8 by a screw 132. The motor 13 is electrically connected to the battery 51 via a switch circuit described later. As shown in FIGS. 1 and 2, the shaft 130 of the motor 13 is provided with a double-sided chamfer 131 having a thickness C. In FIG. 4, reference numeral 15 denotes a clutch mechanism attached to the shaft 3, and the clutch mechanism 15 manually rotates the mirror assembly 7, or something hits the mirror assembly 7 so as to buffer the mirror assembly 7. When rotating 7 or the like, the edge between the movable side mirror assembly 7 and the motor 13 and the deceleration mechanism 24 to be described later and the fixed side mirror base 1, shaft holder 2 and shaft 3 is cut off. .. As shown in FIGS. 4 and 6, the clutch mechanism 15 includes a push nut 16, a compression spring 17, a clutch gear 19, a clutch holder 20, and a washer 21, which are sequentially fitted onto the shaft 3 from above. Consists of. The clutch gear 19 is composed of a spur gear, is rotatable with respect to the shaft 3, and has a locking groove 190 on a lower surface thereof. The clutch holder 20 is fixed to the shaft 3 and has a locking claw 200 on its upper surface. The push nut 16 engages with the engagement groove 5 of the shaft 3 to compress the compression spring 17. Due to the elastic force of the compression spring 17, the locking claw 200 on the upper surface of the clutch holder 20 is locked in the locking groove 190 on the lower surface of the clutch gear 19, so that the clutch gear 19 and the clutch holder 20 are separated from each other. In succession. In addition, the elastic force of the compression spring 17 urges the shaft holder 2 upward through the shaft 3 (conversely, the unit bracket 8 is downward through the clutch mechanism 15), and as a result, the unit bracket 8 side The ball 12 is pressed against the bottom surface of the arc-shaped groove 6 of the shaft holder 2. In FIG. 4, reference numeral 24 denotes a speed reducing mechanism arranged between the clutch mechanism 15 (and the shaft 3) and the motor 13, and the speed reducing mechanism 24 is a shaft of the motor 13 as shown in FIGS. 4 and 5. 130, a first worm 25 joined via a coupling 800 to be described later, a first helical gear 26 as a first worm wheel meshing with the first worm 25, and a D-cut surface (both sides are chamfered). The surface of the second worm 27 has a second worm 27 in which one end of a rotary shaft 47 is movably and non-rotatably attached to the central through hole 46 of the first helical gear 26 by means of 31. And a second helical gear 28 as a second worm wheel meshed with the. Here, the first worm 25 and the first helical gear 26 (first worm gear) as the first worm wheel, and the second worm 27 and the second helical gear 28 (second worm wheel as the second worm wheel) Two-stage worm gear is configured by Then, in the first worm 25, as shown in FIG. 7, a step portion 251 is provided at one end of the rotary shaft 250, and at one end of the rotary shaft 250 as shown in FIG. 1 and FIG. A double-sided chamfer 252 having a thickness C substantially the same as the double-sided chamfer 131 of the shaft 130 of the motor 13 is provided. One end of the rotating shaft 250 of the first worm 25 is rotatably inserted into the plate and the through hole 141 of the recess 140, and the step 251 of the rotating shaft 250 of the first worm 25 is inserted into the recess 140. The edge of the through hole 141 is rotatably abutted. On the other hand, the other end of the rotary shaft 250 of the first worm 25 is rotatably supported in the bearing recess 80 of the unit bracket 8, and the other end surface of the rotary shaft 250 of the first worm 25 is aforesaid. The unit bracket 8 is brought into contact with the bottom of the bearing recess 80.

In FIGS. 1 and 2, reference numeral 800 is a coupling as a joint member. The coupling 800 is made of a rigid member, has a cylindrical shape, and has slits 801 and 802 having a width C3 at both ends thereof. Thus, the double-sided chamfered portion 131 of the shaft 130 of the motor 13 and the double-sided chamfered portion 252 of the rotary shaft 250 of the first worm 25 are provided in both slits 801 and 802 of the coupling 800 in the radial clearance C4 and thrust. Open the clearance C5 in the direction and insert. As a result, the shaft 130 of the motor 13 and the rotary shaft 250 of the first worm 25 are coupled by the coupling 800 having the clearances C4 and C5 capable of transmitting the rotation and torque of the motor 13 to the first worm 25. It means that you have joined.

In FIG. 3, 29 is an output gear 29 of a spur gear which is coaxially fixed to the second helical gear 28, and 30 is interposed between the output gear 29 and the clutch gear 19 as the input gear, Further, the idle gear is a spur gear meshed with the output gear 29 and the clutch gear 19 as the input gear. As a result, the clutch mechanism 15 and the reduction mechanism 24 are connected. The idle gear 30 is rotatably supported on the unit bracket 8 by a rotation shaft (not shown). In FIG. 6, reference numeral 32 is a support separate from the plate 14, and the support 32 is attached to the plate 14 with screws 33, and is fixed to the unit bracket 8 via the plate 14. The plate bearing 14 and the support 32 are provided with a thrust bearing recess 34 and a radial bearing 35. Both ends of the rotary shaft 47 of the second worm 27 (one end and the other end between the first helical gear 26 and the second worm 27) are rotatable on the radial bearing 35 of the plate 14 and the support 32. Balls 36 for thrust bearing are provided between the thrust bearing recess 34 of the plate 14 and the support 32 and both end surfaces of the rotary shaft 47 of the second worm 27. In FIG. 8, 37 is a shaft screw, and this shaft screw 37 is composed of a head portion 38 at one end (upper end), a shaft portion 39 at an intermediate portion, and a screw portion 40 at the other end (lower end). On the other hand, the unit bracket 8 and the plate 14 are provided with a screw hole 41 and a head receiving recess 42, and a boss portion 43 for sandwiching the second helical gear 28 and the output gear 29 from above and below. The shaft portion 39 of the shaft screw 37 is inserted through the central through hole 48 of the second helical gear 28 and the output gear 29, and the screw portion 40 of the shaft screw 37 is screwed into the screw hole 41 of the unit bracket 8 to The head 38 of the screw 37 is engaged with the head receiving recess 42 of the plate 14. As a result, the second helical gear 28 and the output gear 29 are rotatably supported by the shaft portion 39 of the shaft screw 37, and between the boss portion 43 of the unit bracket 8 and the boss portion 43 of the plate 14. Is fixed in the axial direction (thrust direction). Further, the plate 14 and the support 32 are fixed to the unit bracket 8. In FIG. 6, 44 is a gear case portion provided on the unit bracket 8, and 45 is a lid fitted and attached to the upper opening of the gear case portion 44. The shaft 45, the motor 13, the latch mechanism 15 and the reduction mechanism 24 are covered by the lid 45 and the gear case 44.

Hereinafter, an operation operation of the electric retractable door mirror of the present invention having the above-described structure will be described. First, in the state shown by the solid line in FIG. 2, the motor 13 is driven. Then, when the shaft 130 of the motor 13 rotates by an angle θ1, the double-sided chamfered portion 131 of the shaft 130 of the motor 13 abuts the slit 801 of the coupling 800 as shown by the alternate long and short dash line in FIG. The slit 802 of the coupling 800 abuts on the double-sided chamfer 252 of the rotary shaft 250 of the first worm 25, and the rotation and torque of the motor 13 of the first worm 25 go through the worm gear of the two stages and the gear 29 on the motor side. Be transmitted to. Here, since the clutch gear 19 and the clutch holder 20 are in a connected state, the clutch gear 19 is in a fixed state. As a result, the idle gear 30 revolves around the clutch gear 19 while rotating on its axis. As the idle gear 30 revolves, the mirror assembly 7 rotates by an angle θ with respect to the shaft 3 of the mirror base 1, and the mirror assembly 7 moves from the use position to the storage position or from the storage position to the use position. Rotate and displace. With the rotational displacement of the mirror assembly 7, the balls 12 on the side of the mirror assembly 7 and the unit bracket 8 roll along the arcuate grooves 6 on the side of the mirror base 1 and the shaft holder 2 in the directions of arrow B and arrow C. When the above-mentioned ball 12 hits the stepped portion 60 or 61 of the arcuate groove 6 and physically and forcibly stops at a predetermined stop position, a switch circuit described later operates and the motor 13 Is stopped, and the mirror assembly 7 is stopped at a predetermined stop position, that is, a use position or a storage position.

At this time, the electric retractable door mirror of the present invention can transmit the rotation and torque of the motor 13 to the first worm 25 through the shaft 130 of the motor 13 and the rotary shaft 250 of the first worm 25. Since they are jointed by the coupling 800 having the clearances C4 and C5, the rotation and torque of the motor 13 can be transmitted to the worm 25. Moreover, the thrust load and the radial load acting on the first worm 25 of the reduction gear mechanism 24 are not applied to the shaft 130 side of the motor 13 due to the thrust clearance C5 and the radial clearance C4 described above. Therefore, the original performance of the motor 13 can be efficiently exhibited. In particular, the reverse activation performance can be improved. Further, it is possible to allow an eccentricity error between the shaft 130 of the motor 13 and the worm 25 of the reduction mechanism 24.

Further, in this embodiment, the step portion 251 of the rotary shaft 250 of the first worm 25 abuts on the edge of the through hole 141 of the recess 140 which is substantially integrated with the unit bracket 8 and the first worm 25 Since the other end surface of the rotary shaft 250 is in contact with the bottom portion of the bearing recess 80 of the unit bracket 8, the thrust force generated in the first worm 25 is received by the contact portion, and the shaft of the motor 13 is received. It has a structure that does not tell 130. As a result, it is possible to eliminate the difference in the driving sound due to the normal rotation and the reverse rotation of the rotation direction, and to make the motor 13 stress-free, so that the original performance of the motor 13 can be efficiently exhibited.

If an obstacle or the like hits the mirror assembly 7 with a force larger than the elastic force of the compression spring 17 while the mirror assembly 7 is in the use position, or if the mirror assembly 7 is manually put in or taken out of the garage. When the mirror assembly 7 is rotated by a force larger than the elastic force of the compression spring 17, the clutch gear 19 of the clutch mechanism 15 and the clutch holder 20 are disengaged, and the clutch gear 19 rotates with respect to the shaft 3, Along with that, the mirror assembly 7 rotates from the use position to the storage position or from the storage position to the use position, and further tilts the angle φ forward from the use position.

FIG. 11 is an electric circuit diagram showing an embodiment of the switch circuit in the electric retractable door mirror of the present invention described above. In the figure, 51 is a battery as a power source, and this battery 51 is a normal DC 12V battery mounted in an automobile. Reference numeral 57 denotes a switch arranged in the driver's seat. This switch 57 is a switch for switching the polarity, and in this example, a three-position changeover switch interlocking with two movable contacts is used. The switch 57 includes a first movable contact 571 and a second movable contact 572 which are interlocked with each other, a first common contact COM1 and a second common contact COM2, and a first + contact A1 connected to the + pole of the battery 51, respectively. And a second + contact A2, a first contact B1 and a second contact B2 connected to the negative pole of the battery 51, a first middle contact C1 and a second middle contact C2, respectively. In the switch 57, the movable contacts 571 and 572 described above are normally in contact with the middle contacts C1 and C2. Reference numeral 13 is the motor, and the motor 13 is connected to the switch 57 in series. That is, one terminal of the motor 13 is connected to the first common contact COM1 of the switch 57, and the other terminal of the motor 13 is connected to the second common contact COM2 of the switch 57, respectively. Reference numeral 58 is a PTC element utilizing resistance temperature characteristics. This PTC element 58 shows a switching characteristic in which the resistance value changes rapidly in a certain temperature range. For example, a polymer type PTC element (trade name Polyswitch of Raychem Co., Ltd.) is used. use. The PTC element 58 is connected in series between the motor 13 and the switch 57. That is, one terminal of the PTC element 58 is connected to the other terminal of the motor 13, and the other terminal of the PTC element 58 is connected to the second common contact COM2 of the switch 57. In this PTC element 58, the mirror assembly 7 as a moving body is physically and forcibly stopped by a stopper (steps 60 and 61 and the ball 12), and the motor 13 is overloaded. The internal current rises due to the overcurrent that sometimes occurs, and when it reaches a certain temperature range, the internal resistance value rapidly increases and switching operation occurs. The PTC element 58 is bipolar. A relay circuit 610 includes a relay 600, a normally open relay coil 601, a common contact COM, an A contact, and a B contact. The common contact COM of the relay 600 is connected to the first common contact COM1 of the switch 57, and the B contact of the relay 600 is connected to one terminal of the motor 13. One terminal of the relay coil 601 is connected via the capacitor 66 between the common contact COM of the relay 600 and the first common contact COM1 of the switch 57, and the other terminal of the relay coil 601 is connected to the PTC element. 58 and the motor 13, respectively. Reference numeral 68 denotes a resistor. One terminal of the resistor 68 is connected between the relay coil 601 and the capacitor 66, and the other terminal of the resistor 68 is connected between the B contact of the relay 600 and the motor 13. To do.

Next, an operation operation of the above electric circuit will be described. First, the switch 57 is operated to bring the movable contacts 571 and 572 into contact with the + contact A1 and the-contact B2, respectively. Then, a current flows from the capacitor 66 to the relay coil 601 for a moment, the relay coil 601 is excited, and the relay 600 switches from the A contact to the B contact accordingly. As a result, the current from the battery 51 flows in the direction of the solid line arrow, relay 600 → motor 13 → PTC element 58, so that the motor 13 rotates (normally rotates). On the other hand, a part of the current in the direction of the solid arrow flows from the resistor 68 to the relay coil 601, so that the contact state of the relay 600 with the B contact is held by itself. The rotation force of the motor 13 causes the mirror assembly 7 to rotate from the use position to the storage position as described above. Then, when the mirror assembly 7 reaches the retracted position which is the predetermined stop position, the stopper is actuated, that is, the ball 12 on the moving side hits the step 61 of the arcuate groove 6 on the fixed side, and the mirror assembly 7 moves. It is physically and forcibly stopped in the storage position which is the predetermined stop position. At this time, the motor 13 is overloaded and an overcurrent flows in the electric circuit. Due to this overcurrent, the internal temperature of the PTC element 58 rises, and when it reaches a certain temperature range, the internal resistance of the PTC element 58 rapidly increases, and the PTC element 58 performs a switching operation. Then, the energization to the relay coil 601 is cut off, the relay 600 self-recovers and switches from the B contact to the A contact, and the energization to the motor 13 is cut off. As a result, the rotation (drive) of the motor 13 is stopped, and the mirror assembly 7 is completely stopped at the storage position. Therefore, the operation of the switch 57 is stopped and the movable contacts 571 and 572 are automatically returned to the middle contacts C1 and C2. Next, the switch 57 is operated to bring the movable contacts 571 and 572 into contact with the-contact B1 and the + contact A2, respectively. Then, current flows from the PTC element 58 to the capacitor 66 through the relay coil 601 for a moment, the relay coil 601 is excited, and the relay 600 switches from the A contact to the B contact accordingly. As a result, the current from the battery 51 flows in the direction of the one-dot chain line arrow from the PTC element 58 to the motor 13 to the relay 600, so that the motor 13 rotates (reverses). On the other hand, a part of the current in the direction of the one-dot chain line described above flows from the relay coil 601 to the resistor 68, so that the contact state of the relay 600 with the B contact is self-maintained. The rotation force of the motor 13 causes the mirror assembly 7 to rotate, for example, from the storage position to the use position as described above. Then, when the mirror assembly 7 reaches the use position which is the predetermined stop position, the stopper is activated, that is, the ball 12 on the moving side hits the stepped portion 60 of the arcuate groove 6 on the fixed side, and the mirror assembly 7 moves. It is physically and forcibly stopped at the use position, which is the predetermined stop position. At this time, the motor 13 is overloaded and an overcurrent flows in the electric circuit. Due to this overcurrent, the internal temperature of the PTC element 58 rises, and when it reaches a certain temperature range, the internal resistance of the PTC element 58 rapidly increases, and the PTC element 58 performs a switching operation. Then, the relay coil 601 is de-energized, the relay 600 self-recovers and switches from the B contact to the A contact, and the energization to the motor 13 is cut off. As a result, the rotation (drive) of the motor 13 is stopped, and the mirror assembly 7 is completely stopped at the use position. Therefore, the operation of the switch 57 is stopped, and the movable contacts 571 and 572 are automatically returned to the middle contacts C1 and C2.

12 to 14 show a modification of the electric retractable door mirror according to the present invention. In the figure, the same symbols as those in FIGS. 1 to 11 indicate the same things. In the figure, 810 and 820 are a first coupling and a second coupling as joint members. The first coupling 810 is made of a rigid member, has a cylindrical shape, and has a circular through hole 811 provided at the center thereof and two fan-shaped projections 812 integrally projecting from one end surface. Consists of. The second coupling 820 is made of a rigid member, has a cylindrical shape, and has a double-sided cut surface-shaped through hole 821 provided in the center thereof and two fan-shaped convex portions integrally projecting on one end surface. And 822. The two protrusions 812 of the first coupling 810 and the two protrusions 822 of the second coupling 820 have a center angle of 90 ° minus θ2, and have a point symmetry of 180 °. .. The knurled portion 132 of the rotating shaft 130 of the motor 13 is press-fitted into the through hole 811 of the first coupling 810 to fix the first coupling 810 to the rotating shaft 130 of the motor 13. On the other hand, the double-sided chamfer 252 of the first worm 25 is press-fitted into the through hole 821 of the second coupling 820 to fix the second coupling 820 to the first worm 25. The convex portion 812 of the first coupling 810 and the convex portion 822 of the second coupling 820 are opposed to each other with a clear clearance C6 in the radial direction and a clearance C7 in the thrust direction opened. As a result, the first coupling having the clear lances C6 and C7 capable of transmitting the rotation and torque of the motor 13 to the first worm 25 between the shaft 130 of the motor 13 and the rotary shaft 250 of the first worm 25. 810 and the second coupling 820 are jointed. As a result, when the shaft 130 of the motor 13 rotates by the angle θ2, the protrusion 812 of the first coupling 810 on the motor 13 side comes into contact with the protrusion 822 of the second coupling 820 on the first worm 25 side. Since the rotation and torque of the motor 13 are transmitted to the idle gear 30 via the two-stage worm gear and the gear 29 on the motor side, it is possible to achieve the same effect as that of the example shown in FIGS. You can

15 to 17 show a modification of the electric retractable door mirror according to the present invention. In the figure, the same reference numerals as those in FIGS. 1 to 14 indicate the same elements. In the figure, 830, 840 and 850 are a first coupling, a second coupling and a third coupling as joint members. The first coupling 830 is made of a rigid member, has a cylindrical shape, and has a star-shaped through hole 831 at the center of one end face thereof and a double-sided cut surface-shaped through hole 832 at the center of the other end face thereof. .. The second coupling 840 is made of a rigid member, has a cylindrical shape, and has a star-shaped through hole 841 at the center of one end face thereof, and a double-sided cut surface-shaped through hole 842 at the center of the other end face thereof. Set up. The third coupling 850 is made of a rigid member and is slightly smaller than the star-shaped through hole 831 of the first coupling 830 and the star-shaped through hole 841 of the second coupling 840 (see FIG. 16). , A star-shaped through hole 831 of the first coupling 830, a star-shaped through hole 841 of the second coupling 840, and a thickness T between the star-shaped through hole 841 of the second coupling 840 and the third coupling 850. .. The double-sided chamfer 131 of the rotary shaft 130 of the motor 13 is press-fitted into the double-sided cut surface-shaped through hole 832 of the first coupling 830 to fix the first coupling 830 to the rotary shaft 130 of the motor 13. On the other hand, the double-sided chamfer 252 of the first worm 25 is press-fitted into the double-sided cut surface-shaped through hole 842 of the second coupling 840 to fix the second coupling 820 to the first worm 25. The third coupling 850 is inserted into the star-shaped through hole 831 of the first coupling 830 and the star-shaped through hole 841 of the second coupling 840 with a radial clearance C8 and a thrust direction clearance C9. .. As a result, a first coupling having clearances C8 and C9 capable of transmitting the rotation and torque of the motor 13 between the shaft 130 of the motor 13 and the rotary shaft 250 of the first worm 25 to the first worm 25. 830, the second coupling 840 and the third coupling 850 are jointed. As a result, when the shaft 130 of the motor 13 rotates by the angle θ3, the star-shaped through hole 831 of the first coupling 830 on the motor 13 side comes into contact with the third coupling 850, and the third coupling 850 is Since the rotation and torque of the motor 13 contacting the star-shaped through hole 841 of the second coupling 840 on the first worm 25 side is transmitted to the idle gear 30 via the two-stage worm gear and the motor-side gear 29, It is possible to achieve the same effects as those of the example shown in FIGS. 1 to 11 and the examples shown in FIGS.

[0018]

[Effect of the device]

 As is clear from the above, in the electric retractable door mirror of the present invention, the shaft of the motor and the worm of the reduction mechanism are jointed by a joint member having a clearance capable of transmitting the rotation and torque of the motor to the worm. Therefore, the rotation and torque of the motor can be transmitted to the worm. Moreover, due to the clearance of the joint member that joins the shaft of the motor and the worm of the reduction gear mechanism, thrust load and radial load acting on the worm of the reduction gear mechanism are not applied to the shaft side of the motor. Therefore, the original performance of the motor can be efficiently exhibited. In particular, the reverse activation performance can be improved. Further, it is possible to allow an eccentricity error between the shaft of the motor and the worm of the reduction mechanism.

[Brief description of drawings]

FIG. 1 is a partial perspective view of an embodiment of an electric retractable door mirror according to the present invention, showing a double-sided portion of a motor shaft, a double-sided portion of a rotating shaft of a first worm, and a coupling.

FIG. 2 is an explanatory diagram of a clearance between a double-sided chamfer of a motor shaft and a double-sided chamfer of a rotary shaft of a first worm and a slit of a coupling, and an action of the clearance.

FIG. 3 is a partially cutaway plan view showing an embodiment of the electric retractable door mirror according to the present invention.

FIG. 4 is an exploded perspective view of a motor, a speed reduction mechanism, and a clutch mechanism.

FIG. 5 is a perspective view of a motor and a reduction mechanism.

FIG. 6 is a sectional view of an assembled state of a motor, a speed reduction mechanism, and a clutch mechanism.

7 is a sectional view taken along line VII-VII in FIG.

8 is a sectional view taken along line VIII-VIII in FIG.

FIG. 9 is a plan view of the shaft holder.

10 is a development view of XX line in FIG.

FIG. 11 is an electric circuit diagram of a switch circuit.

FIG. 12 is a partial perspective view of an essential part of a first coupling on the motor side and a second coupling on the first worm side, showing a modified example of the electric retractable door mirror according to the present invention.

FIG. 13 is an explanatory diagram of the clearance between the first coupling on the motor side and the second coupling on the first worm side and the action of the clearance.

FIG. 14 is a vertical cross-sectional view showing an assembled state of the first coupling on the motor side and the second coupling on the first worm side.

FIG. 15 is a partial perspective view showing a modified example of the electric retractable door mirror according to the present invention, in which a first coupling on the motor side, a second coupling on the first worm side, and a third coupling in the middle are shown. Figure

FIG. 16 is an explanatory diagram of a clearance between a first coupling on the motor side and a second coupling on the first worm side and an intermediate third coupling, and an action of the clearance.

FIG. 17 is a vertical cross-sectional view showing an assembled state of a motor-side first coupling, a first worm-side second coupling, and an intermediate third coupling.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Mirror base, 3 ... Shaft, 7 ... Mirror assembly, 13 ... Motor, 130 ... Shaft, 131 ... Double-sided part, 132 ... Knurl, 15 ... Clutch mechanism, 24
... Reduction mechanism, 25 ... First worm, 250 ... Rotating shaft, 2
52 ... Double sided part, 800 ... Coupling, 801 and 802 ... Slit, 810 ... First coupling, 811
... Through hole, 812 ... Convex portion, 820 ... Second coupling, 8
21 ... Through hole, 822 ... Convex portion, 830 ... First coupling, 831 ... Star through hole, 832 ... Through hole, 840 ... Second coupling, 841 ... Star through hole, 842 ... Through hole, 850
... third coupling, C4 and C5 and C6 and C7 and C8 and C9 ... clearance.

Claims (1)

[Scope of utility model registration request] 1. A mirror base fixed to a vehicle body, a shaft implanted in the mirror base, a mirror assembly rotatably supported by the shaft, a motor incorporated in the mirror assembly, the motor and the motor. The mirror assembly rotates between the use position and the retracted position with respect to the mirror base by driving the motor, including a reduction mechanism including a worm gear and the like arranged between the mirror base and the shaft. In the electric retractable door mirror that displaces, the shaft of the motor and the worm of the reduction mechanism are
An electric retractable door mirror, comprising a joint member having a clearance capable of transmitting rotation and torque of a motor to a worm.