JPH10129349A - Motor-driven containing type door mirror - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of wind cut noise due to a gap between a mirror holder and a base plate. SOLUTION: A first spring 26 is arranged between a base plate 16 and a mirror holder 23 and an upward elastic force is exerted on the mirror holder 23. A trapezoidal clutch protrusion 31 and a clutch groove 34 are formed between a clutch 28 fitted in a main shaft 17 and a main gear 32. During the stop of a clutch, a press down force is exerted in the direction of the clutch 28 from the main gear 32 through the drive force of a motor 38 during the stop of the clutch 28. The press down force is set to a value higher than the elastic force of the first spring 26. Thus, during rotation of a door mirror, the mirror holder 23 is separated away from the base plate 16, and when the door mirror is stopped, the mirror holder 23 is adhered to the base plate 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric retractable door mirror mounted on a front door of a motor vehicle. Regarding door mirrors.

[0002]

2. Description of the Related Art Conventionally, this type of electric retractable door mirror has been
Since it protrudes outside the vehicle body, it may collide with an obstacle during traveling. In the event of such a collision, the electric system is released to alleviate the impact, and only the door mirror is rapidly moved forward and backward with respect to the base plate without applying rotational force due to external force to the drive motor. A possible structure is employed.

FIG. 6 shows a conventional example, in which 1 is a base plate fixed to a vehicle body front door, 2 is a hollow main shaft fixed to the base plate 1, and 3 is a center shaft 2 on the base plate 1. It is a mirror holder rotatably supported. Reference numerals 4 and 4 denote arc-shaped grooves formed in the base plate 1 and the mirror holder 3, and accommodate ball bearings 5 and 5, respectively. The rotation position of the mirror holder 3 with respect to the base plate 1 is regulated by the groove 4 and the ball bearing 5. The mirror holder 3 includes a mirror (not shown) and an actuator (not shown) for tilting and driving the mirror horizontally and horizontally.
Is attached. The main shaft 2 is formed with a pair of flat surfaces at a portion located above the mirror holder 3 and has a non-circular shape.

[0004] Reference numeral 6 denotes a ring-shaped clutch supported on the mirror holder 3 so as to be vertically movable on the main shaft 2 and has four convex clutch claws 7, 7 #. This clutch 7 has a main shaft 2 at its center.
An opening having a shape corresponding to the non-circular portion is formed, and this opening is fitted to the main shaft 2. Therefore, the clutch 6 cannot rotate with respect to the main shaft 2. 8
Is a main gear rotatably supported by the main shaft 2, and a concave clutch groove 9, 9 ─ with which a clutch claw 7, 7 の of a clutch 6 is engaged is formed on a lower surface thereof. . Reference numeral 10 denotes a coil spring penetrated by the main shaft 2 and elastically presses the main gear 8;
Near the upper end of the main shaft 2
2 is a fixing ring for fixing the upper end of the coil spring 10 through the second fixing ring. Reference numeral 13 denotes a worm gear engaged with the main gear 8, and a forward / reverse rotation motor 15 via a reduction gear group 14.
Linked to The motor 15, the gear group 14, and the worm gear 13 are fixed to the mirror holder 3. Each of these parts, the actuator and the mirror are housed in a mirror housing (not shown).

In the above structure, when the door mirror is rotated from the storage position to the use position and from the use position to the storage position, the mirror holder 3 rotates about the main shaft 2 with respect to the base plate 1.

[0006]

According to the above construction, when the door mirror is rotated between the use position and the storage position,
In order to reduce the sliding resistance, a gap d (normally about 1.0 mm) is provided between the mirror holder 3 and the base plate 1. Since this gap exists even when the mirror holder 3 is stopped at the use position, there is a problem that wind noise is generated during traveling.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide an electric retractable door mirror which achieves both generation of wind noise during traveling and reduction of sliding resistance of a mirror holder.

[0008]

SUMMARY OF THE INVENTION The present invention is directed to a base plate that projects outwardly of a vehicle front door and is fixed substantially horizontally. The base plate is fixed substantially vertically to the base plate and has a large-diameter portion downward and a small-diameter upward. A main shaft in which a step is formed between the large diameter portion and the small diameter portion,
A mirror holder rotatably fitted and supported on the large-diameter portion of the main shaft on the base plate;
A first spring fitted to the main shaft between the mirror holder and the base plate and elastically urging the mirror holder upward; at a top of the mirror holder, at the large diameter portion of the main shaft; On the other hand, a clutch which can be moved in the vertical direction and is fitted in a non-rotatable state and has a plurality of trapezoidal convex clutch protrusions on the upper surface thereof. A plurality of trapezoidal concave shapes that are rotatably fitted to the main shaft and that abut against the steps to prevent downward movement and engage on the lower surface thereof with the clutch projections of the clutch. A main gear having a clutch groove, the main gear being fitted to the main shaft above the main gear; A second spring that abuts on the upper surface to elastically urge the main gear downward, and abuts the main gear against the step to stop the motor; a motor fixed to the mirror holder to apply a rotational force to the main gear; A vehicle door mirror that is disposed between the mirror holder and the base plate and that has a position regulating unit that regulates a use position and a storage position of the mirror holder with respect to the base plate. A gap that allows the clutch and the mirror holder to move up and down by a distance smaller than the height of the clutch projection is provided, and a pressing force applied to the clutch via a main gear by a driving force of the motor when the clutch is stopped, The elastic force of the first spring is greater than the elastic force of the first spring. Is set to be larger than the above pressing force.

In this configuration, when the mirror holder is rotated, the mirror holder and the clutch are pushed upward by the elastic force of the first spring, and the clutch projection is engaged with the clutch groove in a completely fitted state. There is a slight gap between the mirror holder and the base plate. Therefore, there is no frictional resistance between the two,
The rotation driving force of the mirror holder is small. When the mirror holder reaches the use position or the storage position, the rotation of the mirror holder is stopped by the position regulating means. Immediately after this stop, the motor also stops, with a slight time delay during that time. Due to this time delay, the driving force of the motor is applied from the main gear to the stopped clutch, a downward pressing force is applied from the clutch groove of the main gear to the clutch protrusion of the clutch, and the clutch and the mirror holder are elastically driven by the first spring. The mirror holder is pressed down against the force, and the mirror holder comes into close contact with the base plate and stops.

On the other hand, when an external force is suddenly applied to the door mirror from the front or rear due to the collision of an obstacle, the main gear is pushed upward against the pressing force of the second spring, and its clutch groove is engaged with the clutch of the clutch. Remove from projection. As a result, the main gear becomes rotatable about the main shaft, and the door mirror rapidly rotates forward or backward of the vehicle body.

In the present invention, when the clutch protrusion of the clutch is replaced by a trapezoidal concave clutch groove, and when the clutch groove of the main gear is replaced by a trapezoidal convex clutch protrusion, the same applies as described above. When the clutch and the mirror holder are stopped, a downward pressing force is obtained on the mirror holder.

In the present invention, the position restricting means may be an arc-shaped groove formed on a concentric circle centered on the main shaft on the upper surface of the base plate, and the groove formed on a lower surface of the mirror holder. And a convex portion formed at a position opposed to the groove and accommodated in the groove, and a use position and a storage position of the mirror holder are regulated by a position where the convex portion contacts both ends of the groove. .
In such a configuration, the rotation of the mirror holder by the motor is limited to only the movement of the protrusion in the groove.

[0013]

1 and 2, a reference numeral 16 denotes a plastic, ceramic or metal base plate which projects outwardly from a vehicle body and is fixed substantially horizontally to a front door of an automobile.
Reference numeral 17 denotes a hollow plastic or metal main shaft formed substantially vertically at a substantially center of the base plate 16 and fixed to the base plate 16 integrally with the base plate 16 or by screws or the like. The main shaft 17 is provided with a large diameter portion 18 below and a small diameter portion 19 above, and a step 20 is formed between the large diameter portion 18 and the small diameter portion 19. The large-diameter portion 18 has a pair of flat surfaces 21 formed therearound and is non-circular. Reference numeral 22 denotes an upper surface of the base plate 16, which is a pair of arc-shaped grooves formed symmetrically on a circle around the main shaft 17. Both ends of the groove 22 are inclined surfaces.

Reference numeral 23 denotes a mirror holder having a circular opening 24.
Is formed on the base plate 16 via the opening 24 and supported by the large-diameter portion 18 of the main shaft 17 so as to be rotatable and vertically movable. Reference numeral 25 denotes a back surface of the mirror holder 23 and a recess formed around the opening 24. Reference numeral 26 denotes the mirror holder 23 and the base plate 16.
Between the main shaft 17 and
The mirror holder 23 is elastically urged upward by the first spring fitted in the mirror holder 23. As the first spring 26, a coil spring can be used by fitting it to the main shaft 17 as shown in the figure, but other leaf springs can also be used. Reference numerals 27, 27 denote a back surface of the mirror holder 23, and a pair of trapezoidal projections formed outside the recess 25,
It is housed in the grooves 22 on the base plate 16. The groove 22 and the convex portion 27 constitute a position restricting means for determining a use position and a storage position of the mirror holder 23.

Reference numeral 28 denotes a circular ring-shaped clutch which is mounted on the large diameter portion 18 of the main shaft 17 at the upper part of the mirror holder 23 so as to be vertically movable with respect to the main shaft 17. Is formed to have a non-circular shape by forming a flat surface 30 opposite to the flat surface 21 of the large-diameter portion 18 of the main shaft 17, so that the clutch 28 is non-rotatably fitted to the large-diameter portion 18. . 31,
Are formed on the upper surface of the clutch 28 at equal intervals.
The four clutch projections have a trapezoidal convex shape. Here, the height of the clutch projection 31 is 1.7 mm, and the inclination angle of the trapezoidal side surface with respect to the horizontal plane is about 60 °.

Reference numeral 32 denotes a main gear composed of a worm wheel having a circular opening 33 at the center.
The upper portion 8 is fitted into the small diameter portion 19 of the main shaft 17 via the opening 33 and is supported rotatably and vertically movable with respect to the main shaft 17. The lower surface of the main gear 32 is in contact with the step 20, and further lowering of the main gear 32 is prevented. On the lower surface of the main gear 32, four trapezoidal concave clutch grooves 34, 34,... With which the clutch projections 31, 31,. The outer shapes of the clutch groove 34 and the clutch protrusion 31 are similar, and the shape of the clutch groove 34 is
1 slightly larger than the shape. Therefore, when both are completely engaged, the clutch projection 31 comes into close contact with the clutch groove 34.

In a normal use state in which no external force is applied to the door mirror, the main gear 32 is in contact with the step 20, and the clutch 28 and the mirror holder 23 are positioned between the main gear 32 and the base plate 16 at the position. Is regulated. Here, the clutch 28 and the mirror holder 23
Is dimensioned so as to be able to move up and down slightly (about 0.5 to 1.0 mm) between the main gear 32 and the base plate 16. Since the vertical movement distance is set to be smaller than the height of the clutch projection 31, there is no possibility that the clutch 28 will be disengaged from the main gear 32 even if the clutch 28 and the mirror holder 23 are located at the lowest stage.

Reference numeral 35 denotes a small diameter portion 19 of the main shaft 17.
The lower end of the second spring is in contact with the main gear 32, and the upper end of the second spring is in contact with the push nut 37 via the washer 36. The push nut 37 is fixed to the main shaft 17. When the second spring 35 is compressed, the main gear 32 and the push nut 3
The main gear 32 is therefore biased downward by an elastic force. Numeral 38 denotes a reversible rotary motor similar to that described above, which is fixed to the mirror holder 23 side. Reference numeral 39 denotes a reduction gear group disposed between the motor 38 and the main gear 32, and the rotational force of the motor 38 is transmitted to the main gear 32 via the reduction gear group 39.

The relationship between the elastic force of the first and second springs 26 and 35 and the magnitude of the pressing force applied to the clutch 28 via the main gear 32 by the driving force of the motor 38 when the clutch 28 stops is determined by the motor The pressing force by the first spring 26 is set to be larger than the elastic force of the first spring 26, and the elastic force of the second spring 35 is set to be larger than the pressing force by driving the motor 38.

Next, the operation of the above structure will be described. In a normal use state, the driving force is reduced by the rotation of the motor 38 through the reduction gear group 39 and transmitted to the main gear 32. Since the main gear 32 is engaged with the clutch 28, a rotational force is applied thereto. Since the clutch 28 is supported so as not to rotate with respect to the main shaft 17, the clutch 28 tries to rotate the main shaft 17. However, since the main shaft 17 is fixed to the vehicle body via the base plate 16, the main shaft 17 does not rotate. Conversely, the motor 38, that is, the entire mirror holder 23 rotates around the main shaft 17. Become.

This rotation range is regulated by position regulating means. That is, as shown in FIG. 3, the mirror holder 23 rotates with the forward rotation of the motor 38, and the protrusion 27
2 and reaches the use position when it reaches one end side (a in the figure) of the groove 22, while the motor 38 rotates in the reverse direction and the protrusion 2
When the groove 7 comes into contact with the other end of the groove 22 (b in the figure), it reaches the storage position. The positional relationship between the protrusion 27 and both ends of the groove 22 is set so that an appropriate use position and storage position of the mirror holder 23 can be obtained. Thus, the forward / reverse rotation of the motor 38 causes the door mirror to rotate from the use position to the storage position and from the storage position to the use position. When the protrusion 27 comes into contact with the end of the groove 22, the load applied to the motor 38 rises rapidly, and an excessive current flows through the load. The stop at the use position and the storage position is performed by detecting an excessive current flowing through the motor 38.

When an obstacle collides with the door mirror and a sudden external force is applied thereto, a strong rotational force is applied to the main gear 32, and the clutch groove 34 of the main gear 32 is inclined with the clutch projection 31 of the clutch 28. Since they are in contact with each other, the main gear 32 is pushed upward against the pressing force of the second spring 35 and disengaged from the clutch 28, so that the main gear 32 can freely rotate. At the same time, the projection 27 of the mirror holder 23 is
And slides on the upper surface of the base plate 16 and turns. Thus, when a sudden external force of the door mirror is applied, the door mirror also turns suddenly backward or forward.

As shown in FIG. 4, the door mirror is a motor 3
8, the mirror holder 23 and the clutch 28 are urged upward by the first spring 26 to rotate the mirror holder 23 and the clutch 28 between the use position and the storage position. There is a gap between the mirror holder 32 and the base plate 16 with a gap d (0.5 to 1.0 mm). Therefore, when the mirror holder 23 is rotated, the base plate 16
, And the resistance generated during rotation is minimized.

Further, as shown in FIG.
Is reached, the projection 27 of the mirror holder 23 hits the end of the groove 22 and stops, and then the motor 38 stops with a slight delay (about 0.5 seconds). In the case of a time delay between the two, the rotational force of the main gear 32 is applied to the stopped clutch 28 and acts as a pressing force on the clutch projection 31 of the clutch 28 via the inclined surface of the clutch groove 34. As a result, there is a gap d (0.5 to 1.0 mm) between the clutch 28 and the main gear 32, the clutch 28 and the mirror holder 23 are pushed down, and the mirror holder 23 comes into close contact with the base plate 16. Such an operation is similarly performed at the time of storage. Such an operation is performed using a time delay of stopping the motor 38 with respect to the stop of the mirror holder 23. In order to further ensure this operation, the stopping of the motor 38 is appropriately stopped using a delay circuit or the like. Can be set to time.

In the above embodiment, the clutch 28
In the above description, a trapezoidal convex clutch projection 31 is formed on the upper surface of the main gear 32, and a trapezoidal concave clutch groove 34 is formed on the lower surface of the main gear 32. The same function can be obtained by forming a trapezoidal concave clutch groove and a trapezoidal convex clutch projection that engages with the main gear 32 side.

[0026]

According to the present invention, when the door mirror is stopped at the use position or the storage position, the mirror holder is in close contact with the base plate. Therefore, the generation of the wind noise caused by the gap formed between them during traveling of the vehicle is conventionally prevented.

Further, according to the present invention, when the door mirror is rotated between the use position and the storage position, there is a gap between the mirror holder and the base plate, so that both surfaces do not come into contact with each other. Therefore, there is almost no sliding resistance, the load on the motor can be reduced, and the size and power consumption of the motor can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is a cross-sectional view showing a position regulating unit.

FIG. 4 is a partial cross-sectional view for explaining an operation.

FIG. 5 is a partial cross-sectional view for explaining an operation.

FIG. 6 is a partial sectional perspective view showing a conventional example.

[Explanation of symbols]

 Reference Signs List 16 base plate 17 center shaft 18 large diameter portion 19 small diameter portion 20 step 22 groove 23 mirror holder 26 first spring 27 convex portion 28 clutch 31 clutch protrusion 32 main gear 34 clutch groove 35 second spring 38 motor 39 reduction gear group

Claims (3)

[Claims] 1. A base plate protruding outward from a vehicle body of an automobile front door and fixed substantially horizontally, fixed substantially vertically to the base plate, provided with a large-diameter portion below and a small-diameter portion above the large-diameter portion. A main shaft having a step formed between the small-diameter portion and a mirror holder rotatably fitted and supported on the large-diameter portion of the main shaft on the base plate; and a mirror holder between the mirror holder and the base plate. A first spring fitted on the main shaft and elastically urging the mirror holder upward; on the mirror holder upper part, the large diameter portion of the main shaft is movable vertically with respect to the main shaft; A clutch that is fitted in a non-rotatable state and has a plurality of trapezoidal convex clutch protrusions on its upper surface, In the upper portion of the clutch, the main shaft is rotatably fitted to the small-diameter portion of the main shaft, and abuts against the step to prevent downward movement, and has the lower surface of the clutch on the lower surface thereof. A main gear having a plurality of trapezoidal concave clutch grooves engaged with a clutch projection, fitted on the main shaft above the main gear, and abutting against the upper surface of the main gear to elastically lower the main gear; A second spring for urging the main gear into contact with the step to stop the main gear; a motor fixed to the mirror holder to apply a rotational force to the main gear; a motor disposed between the mirror holder and the base plate; A vehicle door mirror comprising: a position regulating means for regulating a use position and a storage position of the mirror holder with respect to a base plate. And a gap is provided between the main gear and the base plate so that the clutch and the mirror holder can move up and down by a distance smaller than the height of the clutch projection, and the motor is driven when the clutch is stopped. An electric storage, wherein a pressing force applied to the clutch via a main gear by force is larger than an elastic force of the first spring, and an elastic force of the first spring is set to be larger than the pressing force. Type door mirror 2. A clutch groove according to claim 1, wherein said clutch projection has a trapezoidal concave shape in place of said clutch projection.
And an electric retractable door mirror, wherein a trapezoidal convex clutch projection is provided instead of the clutch groove of the main gear. 3. The mirror according to claim 1, wherein the position restricting means comprises an arc-shaped groove formed on a concentric circle centered on the main shaft on the upper surface of the base plate and a lower surface of the mirror holder. And a convex portion formed at a position opposed to the groove and housed in the groove, and a use position and a storage position of the mirror holder are regulated by a position where the convex portion contacts both ends of the groove. Electric retractable door mirror characterized by the above-mentioned.