JP2000318524A - Mirror stay driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease impulsive sound at stopping of a mirror and a mirror stay, while achieving simplification and miniaturization of a stopping mechanism of a drive motor. SOLUTION: In this mirror stay driving device, a mirror stay for holding a rear view mirror is rotatably supported at the front end of a vehicle, a driving means 9 is provided in the ceiling of the vehicle, an output shaft 13 to be reciprocated in the specified range by the driving means 9 is projected outward from the vehicle, and the output shaft and the mirror stay are connected to each other by a connecting rod and an operating lever 14. The device is provided with a driving lever 41 having one end rotatably connected to the output shaft, a link lever 40 rotatably connected to the other end of the driving lever, a sector gear 30 rotatably connected to the other end of the link lever and having a stopper part 33 on a tooth surface formed part end formed in the circumferential direction, and a driving means 9 which has a driving motor, in which a pinion gear 11 to be meshed with the sector gear 30 is connected to the motor output shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mirror stay driving device for an electric retractable mirror for a vehicle.

[0002]

2. Description of the Related Art As shown in Japanese Patent No. 2579819, a pin interlocking with a storage mirror moves in a guide groove having a stopper function provided in a unit, and both end positions of the guide groove are respectively used for mirror use and storage. Position, the pin is forced to lock the drive motor when it reaches its end position,
There is known a mirror stay drive control device structure of an electric storage mirror that detects the lock current and forcibly stops the drive motor when the lock current value exceeds a reference lock current value.

The mirror stay drive control device includes a gear 2
5, one end of the pin 26A moves in the guide groove 30A provided in the ceiling plate 30, and when the pin 26A comes to the storage position or the end position of the mirror stay, the pin 26A is moved to the guide groove 30A.
Abuts on the end of the arm, and the movement is restricted. This movement restriction locks the rotation of the drive motor, increases the current consumption flowing through the drive motor, and stops the current supply of the drive motor by detecting that the current reaches the high load current region.

[0004]

As described above, the motor,
A driving device including a link or the like includes a guide groove 30 formed in a ceiling plate 30 by a pin 26A inserted through the gear 25.
The gear 25 stops rotating when it slides inside A and comes into contact with the end of the guide groove 30A. Accordingly, the motor is forcibly locked and a lock current flows. The control circuit detects this lock current, and when a predetermined lock current value is reached, the power supply to the motor is cut off. In this case, the gear 25
When the pin 26A comes into contact with the end of the guide groove 30A with the rotation of the gear, the rotation of the gear 25 stops. Guide groove 3 formed in ceiling plate 30
A great force is applied to the end of 0A. And guide groove 30A
The strength of the ceiling plate 30 is reduced due to the formation. The ceiling plate 30 also supports the first shaft 22, the second shaft 23, the third shaft 24, and the motor 4 as a drive source. The strength of the ceiling plate 30 causes the ceiling plate 30 to flex. The shaft support of each shaft may be distorted, and a problem may occur in the structure of power transmission. In order to increase the strength of the ceiling plate 30, it is conceivable that the thickness of the ceiling plate 30 is increased or the size of the ceiling plate 30 is increased.

Further, the pin 26A has a large diameter guide groove 3
The problem is that the sound generated when moving inside the 0A and reaching the end position resonates and resonates according to the principle of the drum of the ceiling board, thereby amplifying the impact sound and causing discomfort to the occupants. There were also points.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mirror capable of sufficiently reducing the cost while reducing the weight without increasing the thickness of a ceiling plate (bracket) or increasing unnecessary strength without sufficiently forcing a drive motor to be locked. It is to provide a stay driving device.

[0007]

According to the present invention, a mirror stay for holding a rearview mirror is rotatably supported at a front end of a vehicle, and a driving means is provided inside a ceiling of the vehicle. A mirror stay driving device in which a rotating output shaft is projected outside the vehicle and the output shaft and the mirror stay are connected by a connecting rod and an operating lever, wherein a drive lever having one end rotatably connected to the output shaft. When,
A link lever rotatably connected to the other end of the driving lever; and a stopper portion rotatably connected to the other end of the link lever, the stopper being provided at an end of a tooth flanks forming portion formed in a circumferential direction. A mirror stay driving device is provided, comprising: a driving means having a sector gear and a driving motor having a pinion gear meshing with the sector gear connected to a motor output shaft.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the overall configuration of a vehicle rearview mirror device. FIG. 1 is a perspective view of a rear-view mirror device provided on a front end portion of a cab-over type truck in a traveling direction, that is, on a passenger seat side of a right-hand drive vehicle, as viewed from the upper left side at the rear of a cab. Rearview mirror 1
Are held by a substantially U-shaped mirror stay 3 together with the under mirror 2. The mirror stay 3 is rotatably supported on mirror stay rotating shafts 7, 8 by pivot members 5, 6 fixed to a front pillar 4 at the front end of the vehicle. The mirror stay 3 is rotatable between a use position indicated by a solid line and a storage position indicated by a two-dot chain line. The rear-view mirror 1 and the under-mirror 2 are manually positioned so that the rear and lower sides can be visually recognized from the driver's seat with the mirror stay 3 stopped at the use position.

A bracket 18 (see FIG. 2), not shown in FIG. 1, is fixedly installed inside the ceiling between the roof panel and the lining above the passenger seat.
Gear reduction mechanism 10, link lever 40, drive lever 4
1. The output shaft 13 is assembled. The output shaft 13 is rotated by the drive motor 9 via the gear reduction mechanism 10 of the reduction means, the link lever 40, and the drive lever 41. The upper end of the output shaft 13 projects on the roof outside the vehicle.
An operating lever 14 is fixed to the upper end of the output shaft 13. One end of a connecting rod 15 is pivotally attached to an end of the operating lever 14, and the other end of the connecting rod 15 is pivotally attached to a substantially central portion of the upper side of the mirror stay 3. Then, the drive motor 9, the gear reduction mechanism 10, the link lever 40, the output shaft 1
3. The actuating lever 14 and the connecting rod 15 constitute driving means. FIG. 1 shows the use state and the storage state of the rearview mirror 1, in which the solid line indicates the use state and the two-dot chain line indicates the storage state.

FIG. 2 shows a detailed structure of a drive unit constituted by the drive motor 9, the sector gear 30, and the like. In the example of FIG. 2, the tooth portion of the pinion gear 11 is the first stopper 3 of the sector gear 30.
3 and indicates the mirror use position.

The drive motor 9 is a motor that can rotate forward and reverse, and a pinion gear 11 is fixed coaxially with a motor output shaft of a gear reduction mechanism 10 integrated with the drive motor 9. A substantially semicircular sector gear 30 meshing with the teeth of the pinion gear 20 is rotatable around the shaft 31 on the bracket 18. A pin 3 is provided on a part of the peripheral surface of the sector gear 30.
One end of a link lever 40 is rotatably pivotally mounted on the shaft 2. The other end of the link lever 40 has an output shaft 1
The other end of the drive lever 41 connected to 3 is pivotally mounted. In other words, when the use position / storage position switch, which is provided near the driver's seat (not shown), is switched to the storage position, the drive motor 9 rotates (in this case, the normal rotation), and the gear is reduced by the gear reduction mechanism 10. The rotational force is transmitted to the coaxial pinion gear 11. Pinion gear 11
Is transmitted to the sector gear 30 and the sector gear 30
Is cut in a substantially semicircular shape, and turns in the direction of arrow A1 about the turning shaft 31. Due to the rotation, the link lever makes a substantially linear movement in the direction of arrow A2, and the drive lever 41 rotates about the output shaft 13 in the direction of arrow A2. As a result, the operating lever 14 rotates about the output shaft 13 in the direction of arrow A3, and the mirrors 1, 2, the mirror stay 3, the connecting rod 15,
The operating lever 14 is moved from the use position to the retracted position, that is, FIG.
Is set to the position indicated by the two-dot chain line.

Next, a description will be given of a stopper mechanism acting when the drive motor is forcibly stopped, which is a main component of the present invention. A tooth surface meshing with the tooth surface of the pinion gear 11 fixed to the output shaft of the drive motor 9 is formed over substantially half the circumference of the sector gear 30. A stopper 33 and a stopper 34 are formed at both ends in the circumferential direction of the tooth surface. In this embodiment, the stopper portion is a toothless portion.

When the mirrors 1 and 2 are operated from the use position shown in FIG. 2 to the storage position, as a mechanism for stopping the drive motor 9, the pinion 11 rotates with the forward rotation of the drive motor 9, and the sector gear 30 moves in the A1 direction. To rotate.
The pinion gear 1 is rotated by approximately 180 ° of the sector gear 30.
One tooth portion contacts the stopper portion 34 of the sector gear 30. Since the groove portion of the teeth of the sector gear 30 is not formed in the stopper portion 34, the rotation of the tooth portion of the pinion gear 11 is prevented by the portion of the sector gear 30 where the teeth are not formed as a stopper. That is, since no groove is formed in the stopper portion 34, the tooth portion of the pinion gear 11 acts to press the sector gear 30 substantially in the radial direction on the rotation shaft 31 side of the sector gear 30, and the sector gear 30 is moved in the circumferential direction. Since the rotation of the pinion gear 11 cannot be performed, the drive motor 9 is forcibly stopped. This allows mirror 1,
2, mirror stay 3, operating lever 14, connecting rod 15
Stops moving to the storage position.

Next, when a changeover switch provided near the driver's seat is turned on to the mirror use position side, the pinion gear 11 rotates in reverse with the reverse rotation of the drive motor 9 and the sector gear 3 rotates.
Thus, the sector gear 30 rotates in the anti-A1 direction. With the reverse rotation of the sector gear 30, the pin 32 also rotates in the anti-A1 direction about the pin 31 so that the link lever 4
0 moves substantially linearly in the anti-A2 direction, and accordingly, the drive lever 41 also rotates about the output shaft 13 in the anti-A2 direction. In conjunction with this, the mirrors 1 and 2 are positioned as shown by the solid line in FIG.
That is, it is set to the use position.

The tooth portion of the pinion gear 11 is a sector gear 30
Abuts against the stopper 33 or the stopper 34 of
Immediately, the drive current of the drive motor 9 rises to a predetermined lock current value, and the current supply to the drive motor 9 is stopped by the operation of a control circuit (not shown). By the time the current supply is stopped, the teeth of the pinion gear 11
3, or keeps contacting with the stopper 34, but unlike the conventional structure in which the sliding pin in the guide groove is fixed to the sector gear, there is no need to mount such extra parts or to increase the strength of the ceiling plate or the like. In addition, the guide groove is provided in the ceiling plate as in the past and the stopper is used, so that the sound generated when the pin reaches the guide groove resonates and resonates according to the principle of the drum of the ceiling plate, causing unpleasant impact No sound is generated.

FIG. 3 is a modified example of the stopper portion of the sector gear 30, and is an enlarged view of a main portion of the stopper 33, in particular. When the mirror rotation range is slightly different depending on the vehicle type, the shape of the stoppers 33 and 34 is changed to change the shape of the sector gear 3.
The rotation range of 0 can be changed. FIG. 3 shows the stopper 3
In the example in which 3 is higher than the other tooth surfaces, the contact timing of the pinion gear 11 with the teeth is advanced, so that the stop timing is advanced and the rotation range of the sector gear 30 is slightly narrowed. The stopper portion 34 can be similarly applied. In addition, the same effect can be obtained by changing the stop timing by changing the circumferential width of each stopper or changing the number of meshing teeth. This makes it possible to easily increase the variations of the stop position and the operation angle.

[0017]

Since the present invention is constructed as described above, the structure of the stopper portion is simple, there is no need to provide a hole or a groove in the ceiling plate or bracket, etc., and unnecessary strength is increased in the ceiling plate or bracket. Since there is no need, the weight can be reduced and the cost can be reduced. Further, unlike the related art, there is no generation of an impact sound or the like due to a collision of a pin in a guide groove provided in a ceiling plate of a housing. Since the teeth of the pinion gear 11 and the stoppers 33 and 34 of the sector gear 30 come into contact with each other and stop, the impact of the teeth is small, no impact noise is generated, and the occupant does not feel uncomfortable. Has an effect.

[0018]

[Brief description of the drawings]

FIG. 1 is a perspective view showing the overall configuration of the present invention.

FIG. 2 is a diagram showing a main part structure in FIG. 1;

FIG. 3 is an enlarged view of a main part showing another embodiment of a stopper portion.

[Explanation of symbols]

1 ... rearview mirror, 2 ... under mirror, 3 ... mirror stay, 4 ... front pillar, 5, 6 ... pivot member,
7, 8: mirror stay rotating shaft, 9: drive motor, 1
0: gear reduction mechanism, 11: pinion gear, 13: output shaft, 14: operating lever, 15: connecting rod, 1
8 ... bracket, 30 ... sector gear, 31 ... pin, 32 ... pin, 40 ... link lever, 41 ... drive lever,

Claims (2)

[Claims] 1. A mirror stay which holds a rearview mirror is rotatably supported at a front end of a vehicle, and a driving means is provided inside a ceiling of the vehicle, and an output shaft which is reciprocated in a predetermined range by the driving means is provided on the vehicle. A mirror stay driving device in which the output shaft and the mirror stay are connected to each other by a connecting rod and an operation lever, the drive lever having one end rotatably connected to the output shaft, and the other end of the drive lever. A link lever rotatably connected to the link lever, a sector gear rotatably connected to the other end of the link lever, and a stopper provided at an end of a tooth surface forming portion formed in a circumferential direction; and the sector gear. A mirror stay driving device comprising: driving means having a driving motor in which a meshing pinion gear is connected to a motor output shaft. 2. The mirror stay driving device according to claim 1, wherein the stopper comprises a toothless portion.