JPH0593989U - Rearview mirror drive mechanism - Google Patents

Abstract

(57) [Summary] [Object] It is an object of the present invention to provide a rearview mirror drive mechanism for a vehicle-mounted rearview mirror, which is capable of smoothly adjusting a mirror angle and storing a mirror body without imposing a load on a motor. In a rear-view mirror drive mechanism for rotating a mirror body by rotating a motor arranged in a mirror body or for instantaneously adjusting a mirror angle, a coupling is fixed to an output shaft of the motor and the output shaft is connected to the output shaft of the motor. A worm having a coupling piece that engages with the coupling is inserted, and the output shaft is held by a bearing arranged in the actuator unit housing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rearview mirror mounted on a vehicle, and more particularly to a drive mechanism using a motor for storing the rearview mirror and adjusting the mirror angle.

[0002]

[Prior Art]

 As is well known, the rearview mirror mounted on the vehicle is equipped with a mechanism for adjusting the mirror angle by electric remote control and folding and storing the mirror body when the vehicle is parked. Among the above-mentioned electric remote control mechanisms, the mirror angle adjustment mechanism is a mechanism for finely adjusting the mirror angle according to the physique of the driver, etc. There is a mechanism to change and lock.

Among the above-mentioned mechanisms, as a mechanism for instantaneously changing the mirror angle, there is known a mechanism in which an adjust nut connected to a mirror holder is slid by rotation of a motor. That is, usually, a slide member is fixed to the rear end portion of an adjust nut for finely adjusting the mirror angle by a first motor arranged in the mirror body, and this slide member is slid by a second motor. In the mechanism, when the worm wheel meshing with the worm of the second motor rotates by a predetermined angle, it abuts the stopper to stop the motor and lock it at a preset mirror angle.

[0004]

[Problems to be solved by the device]

 By the way, in the conventional drive mechanism, a worm wheel or the like is brought into contact with a stopper to mechanically forcibly stop the motor, and an overcurrent applied to the motor is detected by a motor control circuit to stop the motor. However, in such a structure, a load in the thrust direction and the radial direction is applied to the motor at the same time as the forced stop, which impedes the starting when the motor is rotated in the reverse direction. In addition, the worm and worm wheel may wear quickly, causing rattling and vibration during driving, which may prevent the smooth angle adjustment function. The present invention was made in order to eliminate the above-mentioned problems of the conventional type. The purpose of the present invention is to simplify the structure so that there is no load on the motor and it is possible to smoothly adjust the mirror angle or store the mirror body. It is to provide a drive mechanism for the mirror.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a back mill drive mechanism for rotating a mirror body by rotating a motor arranged in a mirror body or for instantaneously adjusting a mirror angle. A worm having a coupling piece that engages with the coupling is inserted through the output shaft, and the output shaft is held by a bearing arranged in the actuator unit housing.

In the drive mechanism having the above structure, the load in the thrust direction is not directly applied to the output shaft, so that the load on the motor can be reduced, and the motor reversal start can be easily performed. ..

[0007]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. FIG. 1 is a partially cutaway view of an essential part of a rearview mirror to which the driving mechanism of the present invention is applied. In the figure, reference numeral 10 is a mirror body, and 11 is a mirror holder for holding a mirror 12. The mirror holder 11 is pivotally connected to an actuator unit housing 13 whose central portion is fixed in the mirror body 10, and a vertical angle adjusting mechanism and a left / right angle adjusting mechanism arranged in the housing 13 adjust the angle of the mirror 12 to a predetermined angle. Can be adjusted. The drive mechanism of the present invention is applied to a mechanism for vertically adjusting the mirror angle downward when the vehicle is backing, among the mechanism for adjusting the vertical angle of the mirror. Since it is the same as, the detailed description thereof will be omitted.

The mirror up-and-down angle adjusting mechanism 20 of the rearview mirror to which the present invention is applied includes a fine adjusting mechanism 20A for angle adjustment which is performed according to the physique of the driver during normal traveling, and a moment when the angle is instantaneously adjusted during backward driving. It is composed of an adjusting mechanism 20B.

The fine adjustment mechanism 20A is provided with a first motor M1 arranged in the actuator unit housing 13, a worm 21 attached to the output shaft of the motor, a worm wheel 22 meshing with the worm, and a pivot 23 at the tip. The adjusting nut 24 is used as a main member. That is, the worm wheel 22 attached to the output shaft of the first motor M1 is meshed with the worm wheel 22, and a through hole 25 is provided at the center of the wheel 22, and the inner wall of the hole 25 is vertically moved in the axial direction. The groove 26 is provided in. A pivot 23 is provided on the tip side of the adjusting nut 24, and the pivot 23 is fitted to a hemispherical seat 27 provided on the mirror holder 11. On the other hand, a convex portion 28 is formed on the opposite side of the adjusting nut 24, and the convex portion 28 is loosely fitted in the groove 26 provided in the through hole 25 of the worm wheel 22 so as to be slidable with respect to the worm wheel 22. Further, a plurality of claws 29 are provided on the rear end portion of the adjusting nut 24 so as to project inward, and the claws 29 are screwed into an adjusting screw 30 which is prevented from rotating in the housing 13. In the vertical angle fine adjustment mechanism 20A having the above-described configuration, when the first motor M1 is rotated by a predetermined switching operation, this rotation is transmitted to the adjustment nut 24 via the worm 21 and the worm wheel 22, and the adjustment nut 24 is adjusted. 24 rotates in a predetermined direction. At this time, the claw 29 of the adjusting nut 24 is screwed with the adjusting screw 30, but since the adjusting screw 30 is not rotated, the adjusting nut 24 slides, and the slide adjusts the mirror angle.

Next, the mirror angle instant adjustment mechanism 20B will be described. As shown in FIG. 1, this mechanism 20B is mainly provided with a second motor M2 disposed behind the mirror angle fine adjustment mechanism 20A, a worm 32 attached to the output shaft 31, and a worm wheel 33 meshing with the worm. It is a member. That is, the coupling 34 is fixed to the base end side of the output shaft 31 of the second motor M2 as shown in FIG. 3, and the outer side of the coupling 34 is held by the bearing 35 standing on the housing. The aforementioned coupling 34 is provided with an uneven groove 36 toward the output shaft end side. Further, the worm 32 is inserted through the output shaft 31, and the concave and convex grooves 37, which are coupling pieces provided on the worm, are meshed with the concave and convex grooves 36 provided on the coupling 34 (FIG. 4). The end of the output shaft 31 is held by a bearing 38 with a bearing that is provided upright on the housing. The worm wheel 33 that meshes with the worm 32 has fan-shaped teeth 33a, has a larger diameter than the worm wheel 22 that constitutes the angle fine adjustment mechanism 20A, and has a through hole 39 in the center. The slide member 40 is inserted into 39. The slide member 40 is cylindrical and has a pair of spiral grooves 41 on its outer peripheral wall, and a pin 42 is inserted into this groove from a hole 33c formed in the peripheral wall of the worm wheel 33. The front end side holds the adjusting screw 30 which constitutes the mirror angle fine adjustment mechanism 20A, and the rear end portion is provided in the rotation preventing groove 43 on the rear wall 13a of the actuator unit housing 13 as shown in FIGS. The projection 44 of the receiving portion 13b is fitted, and normally, the front end side of the slide member 40 abuts on the front wall 13c side of the actuator unit housing 13 that houses the mirror angle instant adjustment mechanism 20B, and A gap S is provided between the end portion and the rear wall 13a of the housing, and is slidable rearward within this gap. Although the pin 42 is inserted into the spiral groove 41 of the slide member 40 from the worm wheel 33 side in the above embodiment, a ridge provided on the inner wall of the worm wheel 33 may be inserted into the spiral groove 41.

On the other hand, when the fan-shaped teeth 33a of the worm wheel 33 are in the neutral position inside the actuator unit housing 13 and when the fan-shaped teeth 33b are rotated by a predetermined angle, the end surfaces 33b of the fan-shaped teeth are in contact with each other as shown in FIG. A stopper 45 as shown is provided. These stoppers 45 are protrusions protruding from the inner wall of the housing 13, and a cushioning member is attached to the surface with which the end surface 33b of the fan-shaped tooth abuts in order to facilitate reverse activation.

In the mirror angle instant adjustment mechanism 20B having the above-described structure, the front end side of the slide member 40 is a front wall of the actuator unit housing 13 for accommodating the mirror angle instant adjustment mechanism 20B as shown in FIG. It is in contact with the side of 13c, and a gap S is provided between the rear end of the slide member 40 and the housing rear wall 13a. When it becomes necessary to visually recognize the direction of the rear wheels of the vehicle from this state, the second motor M2 is rotated in a predetermined direction by an appropriate switching operation, and this rotation is caused by the coupling 34 fixed to the output shaft 31 of the motor. The worm wheel 33, which is transmitted to the meshed worm 32 and meshes with the worm 32, is rotated. The worm wheel 33 rotates until the end surface 32b of the fan-shaped tooth 33a contacts the stopper 45 provided in the housing 13, and the second motor M2 stops. A pin 42 is provided on the inside of the worm wheel 33 so as to project. The pin is engaged with a spiral groove 41 of a slide member 40 fitted in a through hole 39 of the worm wheel, and the slide member 40 is rotated around the housing 13. Since it is stopped, the pin 42 slides in the spiral groove 41 of the slide member 40 and pulls until the rear end of the slide member 40 abuts on the wall of the receiving portion 13b provided on the rear wall 13a of the housing 13. At the same time, since the adjusting screw 30 is fixed to the front end of the slide member 40, the mirror holder 11 is instantly held in the downward state at a predetermined angle (FIG. 6).

Next, when the rearward visual recognition is finished and the second motor M2 is rotated in the direction opposite to the above when changing the mirror angle for the normal traveling state, the worm 32 and the worm wheel 33 move in the opposite direction. The end surface 33b of the fan-shaped tooth 33a of the worm wheel contacts the stopper 45 on the neutral position side and stops. The slide member 40 slides forward by the rotation of the worm wheel 33, and at the same time, the adjusting screw 30 pushes out the mirror holder 11 and the mirror holder 11 is instantaneously changed and held from the downward state to the normal running state (FIG. 1).

As described above, in the drive mechanism of this embodiment, the worm is inserted into the output shaft of the motor and is coupled to the output shaft by coupling, while the output shaft end is held by the bearing with ball bearings. When the worm wheel is forcibly stopped, the thrust applied to the worm and the load in the radial direction can be received by the bearings provided in the coupling receiving part and the housing, and the load is not directly applied to the motor output shaft or motor.

Although the present invention has been described in the above embodiment as an example in which the present invention is applied to a mirror instantaneous angle adjusting mechanism, the present invention is not limited to this and is also applicable to a mechanism for rotating and storing a mirror body. Is also possible.

Further, it is needless to say that the present invention is not limited to each of the above-described embodiments, and various modifications and design changes can be made without departing from the spirit of the invention.

[0017]

[Effect of the device]

 Since the present invention has the above-mentioned configuration, it has the following unique effects. The reverse start of the motor becomes easy. Since the output shaft end of the motor is held by using a bearing, the shaft does not bend or bend. Worms and worm wheels are not so worn.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a main part of a door mirror to which a driving mechanism of the present invention is applied.

FIG. 2 is an exploded perspective view showing a main part of an adjusting mechanism.

FIG. 3 is a plan view showing a mounting state of a worm.

FIG. 4 is a cross-sectional view showing a meshed state of a coupling and a worm.

FIG. 5 is a perspective view of the same.

FIG. 6 is a diagram showing tilting of a mirror.

[Explanation of symbols]

 10 mirror body 11 mirror holder 12 mirror 13 actuator unit housing 13a rear wall 13b receiving portion 13c front wall 14, 23 pivot 20 mirror angle adjusting mechanism 20a mirror angle fine adjusting mechanism 20b mirror angle instantaneous adjusting mechanism 21, 32 worm 22, 33 worm Wheel 24 Adjust nut 25, 39 Through hole 26 Groove 27 Hemispherical receiving part 28 Convex part 29 Claw 30 Adjust screw 33a Fan tooth 33b Fan tooth end face 33c Hole 34 Coupling 35, 38 Bearing 36, 37 Uneven groove 40 Sliding member 41 Spiral Groove 42 Pin 43 Anti-rotation groove 44 Protrusion 45 Stopper

Claims (1)

[Scope of utility model registration request] 1. In a rear-view mirror drive mechanism for rotating a mirror body by rotating a motor arranged in a mirror body or for instantaneously adjusting a mirror angle, a coupling is fixed to an output shaft of the motor and the output is provided. A drive mechanism for a rearview mirror in which a worm having a coupling piece that engages with the coupling is inserted into the shaft and the output shaft is held by a bearing arranged in an actuator unit housing.