JPS61110639A - Visor position detector in motor door mirror - Google Patents

Abstract

PURPOSE:To ensure accurate operation and to simplify the structure by functioning a detection switch while overlapping the relative rotation of cam due to rotation of a visor against the detection switch and the axial motion due to the motion of moderation mechanism. CONSTITUTION:The bracket 12 of a visor is fitted rotatably into a hollow shaft 3 of shaft member 2 to be fixed to the stay to constitute a moderation mechanism 10 for holding the visor 14 at predetermined position with a moderation groove 14 formed in the bottom face of bracket 12 and a moderating projection 5 formed on a washer to be fixed rotatably to the base of the shaft 3. The shaft 3 is fitted with a washer 16, a gear base 17, a gear 18, a washer 19 and a cam base 20, then supported resiliently by a coil spring 15 to engage the gear 18 with the output shaft 36 of the drive motor section 31. A switch 42 co-operating with a cam 43 on the cam base 20 is fixed through a switch plate 41 to the underface of drive motor section 31 thus to construct the switch section.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a visor position detection device used to stop the visor of an electric door mirror at a predetermined position.

<Prior art> When a visor containing a mirror is rotatably supported on a stay fixed to the vehicle body, and the visor is rotated in the longitudinal direction by a motor, a cam and a micro switch are used to stop the visor at a predetermined position. Position detection switches are generally used, such as a combination or a combination of a fixed contact and a movable contact. For example, when raising the visor from the retracted position and stopping it in the use position, a detection switch turns off the visor in the use position, and when it is folded down to the retracted position and stops it, a detection switch turns it off in the retracted position.
Each motor circuit is cut off.

<Problems to be Solved by the Invention> The above-mentioned position detection switch is required to operate in synchronization with the moderation action of the moderation mechanism at a predetermined position, but it is necessary to increase the precision of processing and assembly of parts. However, complete synchronization is difficult.

The present invention has been made to solve these problems and to provide a visor position detection device that has a relatively simple structure and operates accurately.

Means for Solving Problems> In order to achieve the above object, the present invention provides an electric door mirror whose visor is rotated by a motor. A moderation mechanism that holds the visor in a predetermined position by a combination of grooves, a detection switch located on either the visor side or the stay side, and a cam that changes the operating state of the detection switch at a corresponding predetermined position. is provided on the other side, and a switch section is provided that operates the detection switch by superimposing the movement of the cam surface that moves along the axial direction of rotation and the axial movement by the moderation mechanism.

<Operation> In the position detection device of the present invention, the relative rotation of the cam and the detection switch accompanying the rotation of the visor and the axial movement associated with the operation of the moderation mechanism are superimposed, so that the cam surface and detection at a predetermined position are superimposed. The change in the distance from the switch is expanded, making it possible to reliably operate the detection switch at a predetermined position, and the moderation action of the moderation mechanism and the operation of the detection switch are completely synchronized.

<Example> The present invention will be specifically described below with reference to an illustrated example.

First, the paper structure will be described with reference to the drawings from FIG. 2 onwards. FIG. 2 is a partially exploded perspective view of the rotating shaft portion, FIG. 3 is a detailed exploded perspective view of the same portion, and FIG. 5 is a sectional view of the same portion in an assembled state.

In the figure, 1 is a stay, 2 is a shaft member fixed to the stay 1, and 3 is a hollow shaft. 11 is a visor, 12 is a bracket of the visor 11, and 13 is a shaft hole formed in the bracket 12. By the combination of the pongee 3 and the shaft hole 13, the visor 11 is rotatably supported by the stay 1. 4 is a washer rotatably attached to the base of the pongee 3, 5 is a moderation ridge formed on the washer 4, 14 is a moderation groove formed on the bottom surface of the bracket 12, and the moderation ridge 5 and the moderation groove 14 are connected to the shaft. 3
, and constitutes a moderation mechanism 10 for holding the visor 11 in a predetermined position.

15 is a coil spring, 16 is a washer, 17 is a gear base, 18 is a gear, 19 is a washer, and 20 is a cam base. 20 is unrotatably supported on the shaft 3 by the vertical groove 6 of the shaft 3, and the gear 18 is supported by the protrusion 18a on the lower surface and the four parts 1 of the gear base 17.
Rotation with respect to the gear base 17 is restricted due to the combination with 7a. Moderation thread 5 and moderation groove 14 of moderation mechanism 10
A constant pressure contact force is applied between the fill spring 15 and the fill spring 15.

Reference numeral 31 denotes a drive motor section, which includes a drive motor 32,
It is equipped with a speed reducer 33 (see FIG. 5) and is fixed to the bracket 12 with screws 34 and 35. 36 is gear 18
When the motor 32 rotates, the output gear 36 moves around the outer circumference of the gear 18, and the visor 1
1 rotates about the shaft 3 with respect to the stay 1.

41 is a switch plate, 42 is a small microswitch used as a detection switch, 43 is a cam,
The switch plate 41 is attached to the lower surface of the drive motor section 31 by screws 44, and the microswitch 42 is fixed to both ends of the switch plate 41 by screws 45 with the actuator 42a facing downward. Correspondingly, the cam 43 is fixed to the upper surface of the cam base 20, and a switch section 50 is configured by the combination of the microswitch 42 and the cam 43.

The positional relationship between the moderation mechanism 10 and the switch section 50 is set as shown in FIG. In other words, three grooves 14 (hereinafter referred to by adding N at the end of the reference numeral) with which the peaks 5 engage when the visor 11 is in the upright use position are provided at an interval of 120°. The groove 14 (hereinafter referred to with R at the end of the reference numeral) that is engaged with the ridge 5 in the retracted position when the holder is rotated backward is also 1.
Three grooves are provided at intervals of 20 degrees, and the grooves 14R are arranged deviated from the grooves 14N by 60 to 70 degrees.

Correspondingly, the switch unit 50 has one switch 42 in the use position (hereinafter, the reference numerals are indicated with N at the end).
is pushed by one of the cams 43, and the capacity switch 42 (hereinafter indicated with R at the end of the reference numeral) is pushed by the capacity cam 43 in the retracted position.

FIG. 7 shows an example of a drive circuit using the switch section 50 having the above configuration. 1, 51 is a power source, and 52 is a drive motor 3 for rotating the visor 11 in any direction.
2 to the power supply 51 with arbitrary polarity, and among the circuits selected by the operation switch 52,
A switch 4 is placed on the side that rotates the motor 32 in the direction of the use position.
2N, insert the switch 42R on the side to be rotated toward the storage position, and each switch 42N, 42R is connected to the cam 43.
It is set to turn off when pressed. Note that FIG. 7 shows a basic circuit configuration, and can actually be applied to various drive circuits.

Next, the operation will be explained. Figures 1(a), 6(a) and 7(,) show the visor 11 in the retracted position, and Figures 1(b) and 7(b) show the visor 11 in the retracted position. and the use position, respectively. In the state shown in FIG.
is lowered, so the switch 42R is pushed by the cam 43 and turned off as shown in Figure 7 (,).
The switch 42N is not pushed by the cam 43 and is turned on. Therefore, even if the operation switch 52 is turned upward, the motor 32 will not operate.

Conversely, when the switch 52 is turned downward, the switch 42
A drive current I in the direction of the solid line arrow flows through the motor 32 via N, and the motor 32 rotates the visor 11 in the direction of the use position.

Therefore, the bracket 12 is moved in the direction of the solid arrow in Fig.
rotates, and the groove 14R is removed from the crest 5, and the bracket 12
is pushed upward, and at the same time the cam 43 moves and the switch 42R is turned on. This is the state shown in FIGS. 1(b) and 7(b), and when the visor 11 is rotated to the use position, the crest 5 engages with the groove 14N, and the bracket 12 and switches 42N and 42R are lowered again. At this time, switch 4
Since the cam 43 is located below 2N and there is no cam 43 below the switch 42R, only the switch 42N is turned off, the motor 32 is stopped, and the visor 11 is stopped in an upright position at the use position.

FIG. 6(b) shows the positional relationship of each part at this time.

Next, while in this use position, turn the operation switch 52 to the seventh position.
When the power is applied upward in the figure, the driving current ■ flows in the direction of the dashed arrow in the motor 32, contrary to the above, and the motor 32 is connected to the visor 1.
1 in the direction of the storage position, the bracket 12 is rotated in the direction of the dashed arrow in FIG. 1, the groove 14N is removed from the peak, and the bracket 12 is pushed up. When the retracted position is reached, it is again shown in Fig. 1 (a) (and Fig. 6 (,), Fig. 7 (a)).
), the switch 42R is turned off, the motor 32 is stopped, and the visor 11 is in the retracted position.

In this way, the switch 42N is turned off in the use position, and the switch 42R is turned off in the retracted position, and both switches 42N and 42R are turned on in the intermediate position. It rotates in the opposite direction and automatically stops at the use position and storage position. Note that even if the visor 11 falls forward beyond the use position due to an external force, since the switch 42R is on, the motor 32 can rotate it toward the storage position. Further, since it is practically unnecessary to rotate the visor 11 forward by the motor 32 to a position beyond the use position, the switch 42N is kept pushed by the cam 43 and remains off even after the use position is exceeded. Alternatively, the shape of the cam 43 corresponding to the switch 42N may be selected in advance.

As mentioned above, the microswitches 42N and 42R are pushed by the cam 43 and turned off at a predetermined position. Muscle groove 14N, 14R and moderation mountain 5
The lowering action of the microswitches 42N and 42R due to engagement with the microswitches 42N and 42R is superimposed and pushed, and the switches 42N and 42R are reliably opened and closed in synchronization with the moderation action of the moderation mechanism 10.

<Effects of the Invention> As is clear from the description of the embodiments above, the present invention superimposes the relative rotation of the cam and the detection switch accompanying the rotation of the visor and the axial movement associated with the operation of the moderation mechanism. Since the detection switch is actuated, the change in the distance between the cam surface and the detection switch is expanded, and it becomes easy to operate the detection switch reliably and in complete synchronization with the moderation action.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG.
) and Fig. 1(b) are side views of the main parts to explain the operation, Fig. 2 is a partially exploded perspective view of the main parts, Fig. 3 is an exploded perspective view of the same parts, and Fig. 4 is a diagram of the bracket. A perspective view showing the bottom upside down, FIG. 5 is a sectional view of the same part, FIG. 6 (a) and foil 6 (1)) are explanatory diagrams of the positional relationship of the moderation mechanism and the switch part, FIG. 7(a) and FIG. 7(1)) are wiring diagrams of an example of the drive circuit. 1... Stay, 3... Axis, 5... Moderation mountain, 10.
... Moderation mechanism, 11... Visor, 12... Bracket, 14... Moderation groove, 32... Drive motor, 42...
... Microsinch (detection switch), 43... Cam, 50... Switch section.

Claims (1)

[Claims] (1) In an electric door mirror in which the visor containing the mirror is rotatably supported by a stay fixed to the vehicle body, and the visor is rotated back and forth by a motor, the visor is formed to face the axis of rotation. A moderation mechanism that holds the visor in a predetermined position by a combination of a moderation ridge and a moderation groove, and a detection switch placed on either the visor side or the stay side, and the operating state of the detection switch at a corresponding predetermined position. A cam for switching is provided on the other side, and a switch part is provided that activates the detection switch by superimposing the movement of the cam surface that moves along the axial direction of rotation and the axial movement by the moderation mechanism. Visor position detection device for electric door mirrors.