JPH0129741B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mirror drive device for a so-called remote control fender mirror that allows the driver's seat to freely adjust the inclination angle of the mirror.

A fender mirror provided on the fender of a vehicle plays an important role in ensuring visibility to the side and rear of the vehicle, and is indispensable especially when changing lanes while driving.
Therefore, the driver must always adjust the inclination angle of the fender mirror to correspond to the position of his/her eyes in the driver's seat.

In recent years, with the spread of automobiles and the demand for safe driving, various so-called remote control fender mirrors have been proposed that allow the angle of the fender mirror to be freely adjusted from the driver's seat.

In other words, the driving device for this type of fender mirror is not only easy to operate, but also
First of all, it must operate reliably and be compact, and it must have a simple structure with a small number of parts and can be manufactured at low cost.It must also have a structure that can sufficiently handle drive motor overruns and manual operation, and it must not malfunction due to vibration. It must be in response to such requests. However, the devices proposed so far have not yet been able to satisfy all of these requirements. For example, as shown in USP3609014 or Japanese Patent Application Laid-open No. 129048/1983,
A mirror drive device has been proposed in which a threaded rod is provided on the back of the mirror so as to be tiltable, a worm wheel is connected to the threaded rod via a spring, and the worm wheel is rotated by a motor to move the threaded rod forward and backward. There is.

However, all of these proposals have problems in that the connection structure between the threaded rod and the mirror becomes complicated and that an appropriate elastic force cannot be imparted to the spring that connects the worm wheel and the threaded rod. In other words, since the threaded rod must be connected to the mirror in a tiltable but non-rotatable state, a universal joint with a pin serving as a pivot is required, making the structure extremely complicated. Since it is held by the worm wheel and rotates together with the worm wheel, a long one cannot be used, and therefore it is difficult to obtain one that has both the desired amount of elastic displacement and elastic repulsion.

The present invention was made in view of the above circumstances, and has an extremely simple structure in which a threaded rod is provided to be rotatable and tiltable relative to the mirror, and this threaded rod is slidably connected to the worm wheel. To provide a mirror drive device for a remote control fender mirror that has a simple connection structure with the mirror and can accurately handle overrun or manual operation of the drive motor. Hereinafter, its configuration and the like will be explained in detail with reference to embodiments shown in the drawings.

1 to 3 show an embodiment of a mirror driving device according to the present invention, in which FIG. 1 is a rear view, FIG. 2 is a cross-sectional view, and FIG. 3 is a cross-sectional view.
In these figures, the reference numeral 1 indicates a mirror housing, which is fixed to the fender of the vehicle by a bracket (not shown) integrally provided at the lower part of the mirror housing. Reference numeral 2 denotes a substrate fixedly installed within the mirror housing 1, which holds together various members to be described later. Reference numeral 3 designates a mirror disposed to close the open end of the mirror housing 1, and reference numeral 4 designates a mirror holder, from which a spherical portion 5a constituting a holder to be described later is integrally protruded from the center portion. That is, the reference numeral 5 indicates a holder that holds the mirror 3 so as to be tiltable in all directions with respect to the substrate 2. It is comprised of a pedestal 5c which is integral with the base plate 2 provided with the base plate 5b, a screw 5d whose head lower surface is formed into a spherical shape, a compression coil spring 5e, a nut 5f, and the like.

6 is a drive motor fixed on the substrate 2 by a bracket (not shown); 7 and 8 are worms rotatably mounted on the drive shaft 9 of the drive motor 6; Dock clutch portions 10 and 11 are integrally provided in the portion. 12 denotes these two dock clutch parts 10, 11.
The movable clutch portion is selectively connected to the motor drive shaft 9 and is slidably and cooperatively provided with the motor drive shaft 9. That is, a prismatic portion 9a is provided approximately at the center of the motor drive shaft 9, and the movable clutch portion 1
2 slides on this prismatic portion 9a. Further, this square column portion 9a is in rotatable contact with both the dog clutch portions 10, 11, so that the worms 7, 8
axial movement is restricted. 13 is a solenoid for driving the movable clutch portion 12;
This solenoid 13 includes an actuating piece 13a into which the movable clutch portion 12 is rotatably engaged, and an actuating rod 1.
3b, an exciting coil 13c, a bobbin 13d, a compression coil spring 13e, a frame 13f, etc., and is connected to the substrate 2 by a stay (not shown).
Fixed on top.

Worm wheels 14 and 15 mesh with the worms 7 and 8 and rotate a threaded rod, which will be described later, and are rotatably supported by a bearing member (not shown). The worm wheels 14 and 15 are provided with a square shaft hole 16 into which a square pillar portion formed at the tilting end of a threaded rod, that is, the end opposite to the mirror 3, is slidably fitted. It is set up. 17 and 18 are threaded rods whose one ends are rotatably and tiltably connected to the back of the mirror holder 4;
7 and 18 are arranged on the substrate 2 so as to be located on the vertical axis y and the horizontal axis x, respectively, which are perpendicular to each other with the installation position of the cage 5 as the intersection point 0.
These threaded rods 17 and 18 are connected to the spherical part 1.
7a, 18a, heads 17b, 18b, threaded part 17
c, 18c and the worm wheel 14,1
The square column portions 17d and 18d that fit into the shaft hole 16 of No. 5 are integrally formed. In addition, the spherical part 17
a, 18a are rotatably and tiltably held by a connecting portion 19 integrally provided on the back surface of the mirror holder 4.

Reference numeral 21 denotes a spring member that engages in the thread grooves of the threaded rods 17 and 18, and has its own tension force to tighten the threaded portion 1.
It is provided on the substrate 2 so that its working end is in contact with a fixed position of 7c and 18c. That is,
In this embodiment, as shown in FIG.
The engaging part 21a that attaches to the screw rod 18 and the locking part 21b that attaches to the other threaded rod 18 are formed of a single wire, and are fixed on the board 2 using an annular part 21c bent and formed in the center of the wire. has been done. In addition, 22
is a holding member that holds each tip of the spring member 21, and is used to restrict the locking portions 21a and 21b from moving together due to the forward and backward movement or rotation of the threaded rods 17 and 18. It is integrally installed on the top.

Note that this spring member 21 is not limited to such a structure, and may be formed of a leaf spring, for example, as shown in FIG. 5. If the holding member 22 is formed of a leaf spring in this way, the holding member 22 is not necessarily required, but the engaging parts 21a and 21b are bent into a V-shape, and the bracket part 21d for being held on the board 2 side is formed. Needless to say, it must be formed.

By the way, when the mirror is tilted using the retainer 5 as a fulcrum, each threaded rod 17, 1
The distance on the plane up to 8 changes, albeit slightly. That is, as shown by arrow A in FIG. 2, the connecting portion of the threaded rod moves along an arcuate trajectory as the mirror 3 tilts. For this reason, the threaded rod is also inclined with respect to the substrate 2, making it difficult to fit the prismatic portions 17d, 18d into the shaft holes 16 of the worm wheels 14, 15. Therefore,
The prismatic portions 17d, 18d and the shaft hole 16 may be fitted loosely with a sufficient free movement gap to accommodate the inclination of the threaded rod, or as shown in FIG. 6B or FIG. It must have a shaft hole structure. That is, in the worm wheels shown in FIGS. 6B and 7, the shaft hole is formed by the protrusion 26 so that the sliding surface with the prismatic portion is in line contact.

The mirror drive device configured in this manner is driven by lever operation of a multidirectional changeover switch provided near the driver's seat. That is, by operating this switch, the drive motor 6 is turned on and off, its forward and reverse rotation is controlled, and the solenoid 13 is energized and de-energized to tilt the mirror in a desired direction.

Therefore, when the drive motor 6 is driven in the state shown in FIGS. 1 to 3, that is, with the solenoid 13 in a de-energized state, the rotation of the motor shaft 9 is caused by the rotation of the movable clutch portion 12, the worm 8, and the worm wheel 15. and is transmitted to the threaded rod 18. When the threaded rod 18 rotates, the spring member 21 is engaged in the threaded groove thereof, so that the spring member 21 acts as a nut, and the threaded rod moves forward and backward relative to the base plate 2 in accordance with the direction of rotation. That is, if the worm wheel 15 rotates clockwise in FIG. 1, the threaded rod 18 in FIG. 2 moves downward, and if it similarly rotates counterclockwise, it moves upward.
Therefore, the mirror 3 tilts using the holder 5 provided at its back as a fulcrum. On the other hand, when the solenoid 13 is energized and energized, the meshing between the dog clutch portion 11 and the movable clutch portion 12 is released, and the movable clutch portion 12 engages the dog clutch portion 10.
meshes with In this way, if the drive motor 6 is driven again, its rotation will be transmitted to the other threaded rod 1 via the worm 7 and the worm wheel 14, as described above.
7, and the mirror 3 is tilted by moving the threaded rod 17 forward and backward in a direction corresponding to the direction of rotation.

If the drive of the drive motor 6 is overrun,
That is, if the motor is driven for a time exceeding a predetermined tilting angle range of the mirror, the back surface of the mirror holder 4 will hit the pedestal 5c of the substrate 2, making further tilting impossible. In such a case, the spring member is pushed outward by the threads of the threaded rod, so it does not function as a nut, and the threaded rod simply spins in a fixed position, causing the drive motor to seize, or Moreover, there is no possibility that the rotation transmission member or the like will be damaged. Similarly, when the mirror 3 is pressed and tilted with a fingertip or the like without being driven by the drive motor, the spring member is pushed outward by the thread of the threaded part, so the transmission mechanism The tilt angle of the mirror can be adjusted without causing any damage.

FIG. 6 is a front view showing another embodiment and its B-B
In the cross-sectional view, whereas the previous embodiment uses one drive motor, a solenoid, and a clutch, this embodiment uses two drive motors designated by reference numerals 6a and 6b. Furthermore, in the above embodiment, the diagrams omitted the bearing structure of the worm wheel for convenience of explanation, but in this embodiment, the cylindrical bearing part 2a provided integrally with the substrate 2 and the worm wheel 14 are shown. , 15 from the rear is illustrated. Further, in this embodiment, a more practical structure of the cage 5 is illustrated.

That is, the mirror holder 4 and the pedestal 5 of the substrate 2
By providing a prismatic portion 29 and a pin 31 that prevents the stud itself from rotating in a part of the stud 28 that connects the mirror 3, the rotation of the mirror 3 is prevented and a compression coil spring is installed between the substrate 2 and the mirror holder 4. By interposing 30, smooth driving is achieved. The other members are not substantially different from those in the previous embodiment, so the same or equivalent members are given the same reference numerals and their explanations will be omitted.

Therefore, in this embodiment, by selectively driving either one of the drive motors 6a, 6b, the threaded rod is rotated via the worm wheel to tilt the mirror.

Figure 7 shows screw rods 17, 18 and mirror holder 4.
As is clear from this figure, the tips of the threaded rods 17 and 18 are inserted into the spherical rotor 32 rotatably held by the connecting part 19. It is something that has been involved. FIG. 8 is a sectional view and an exploded perspective view of another embodiment of the clutch shown in FIGS. 1 and 2. A dock clutch 12 is provided integrally.

As explained above, according to the present invention, since the threaded rod is rotatably connected to the mirror, the connecting structure is simple, processing or assembly is easy, and the size of the part can be expected to be reduced. In addition, there is no need to hold the spring member on a worm wheel as in the past, and the base can be held on the board side, so long springs can be used, and therefore springs with desired characteristics such as large deflection can be used. There is an advantage that the parts are easily obtained.

[Brief explanation of drawings]

FIG. 1 is a front view of a mirror driving device according to the present invention, and FIGS. 2 and 3 are - in FIG. 1.
4 is a perspective view of the spring member, FIG. 5 is a perspective view showing another embodiment of the spring member, and FIG. 6 is a front view showing another embodiment, as well as its B- B sectional view, FIG. 7 is a sectional view showing another embodiment of the connecting portion between the threaded rod and the mirror holder, and FIG. 8 is a sectional view and an exploded perspective view showing another embodiment of the clutch portion. 1... Mirror housing, 2... Board, 3...
Mirror, 5... Holder, 6, 6a, 6b... Drive motor, 7, 8... Worm, 14, 15... Worm wheel, 16... Shaft hole, 17, 18...
Threaded rod, 17d, 18d...Prismatic portion, 21...Spring member.

Claims (1)

[Claims] 1 A substrate fixed in a mirror housing, a holder provided on the back of the mirror to hold the mirror tiltably in all directions relative to the substrate, and a vertical axis and a lateral axis perpendicular to each other with the holder position as an intersection point. A prismatic portion is disposed on the substrate so as to be movable forward and backward, rotatable, and tiltable in all directions so as to be located on the axis, and supports the mirror together with the holder, and a prismatic portion is provided at the end opposite to the mirror side. a pair of threaded rods, each of which has a threaded rod, a spring member whose working end is attached such that it fits into a thread groove of the threaded rod and whose base portion is held on the substrate side, and a prismatic portion of the threaded rod that is slidable. A worm wheel having a shaft hole formed by a square hole that fits into the worm wheel, and a drive motor that selectively drives the threaded rod through the worm that meshes with the worm wheel. Mirror drive device.