JPH0513648Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> The present invention relates to an electrically foldable door mirror in which a bracket supporting a mirror and a mirror housing is rotated by a drive mechanism.

<Prior Art> This type of electrically foldable door mirror includes a base fixed to the door, a fixed shaft erected on the base, a bracket rotatably attached to the fixed shaft, and the bracket. a mirror housing that is attached to and covers the outside of the mirror housing; a mirror that is adjustable and held in the front opening of the mirror housing; and a planetary gear that is incorporated in the bracket and meshes with a fixed gear that is locked to a fixed shaft. A known device is equipped with a drive mechanism that drives and rotates the bracket, and a switch mechanism that detects the rotational position of the bracket and controls the drive mechanism.

The drive mechanism has a structure in which the output of the drive motor is transmitted to the planetary gear via a reduction gear mechanism, and the reduction gear mechanism is a structure in which a multi-stage spur gear train is incorporated in a gear case attached to a bracket. It is being

<<Problems to be solved by the invention>> However, in such conventional technology, the reduction gear mechanism consists of a spur gear train and is housed in a gear case, so the structure is extremely large and the mirror housing is too large. There was a problem that led to the increase in size. For this reason, it has become difficult to form a ventilation gap, for example, between the proximal end of the mirror housing and the base, and it has also become difficult to take measures against wind noise using the door mirror.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electrically foldable door mirror in which the drive mechanism is miniaturized and the shape of the mirror housing can be freely designed.

<Means for solving the problem> The electric flexible door mirror of the present invention includes a base fixed to the door, a fixed shaft erected on the base, and rotatably assembled to the fixed shaft. A fixing device comprising a bracket, a mirror housing attached to the bracket and covering the outside thereof, and a mirror adjustable and held in a front opening of the mirror housing, and locked to the fixed shaft via a clutch mechanism. An electrically foldable door mirror that rotates the bracket by driving a planetary gear meshed with the gear by a drive mechanism provided on the bracket, the drive mechanism comprising a drive motor and a reduction gear mechanism attached to the bracket. The reduction gear mechanism includes:
a first worm gear attached to an output shaft protruding from the lower part of the drive motor; a first worm wheel meshing with the first worm gear; a second worm gear connected to the first worm wheel; The clutch mechanism includes a second worm wheel that meshes with the worm gear, and a planetary gear that is connected to the lower part of the second worm wheel and meshes with the fixed gear. a clutch groove formed in the fixed gear, comprising a plate and a coil spring attached to the outer periphery of the fixed shaft above the fixed gear, and the spring force of the coil spring presses the clutch plate and the fixed gear. and a clutch groove formed in the clutch plate are engaged with each other,
Furthermore, a cover for covering the drive mechanism is attached to the front surface of the bracket.

<<Operation>> Each gear of the reduction gear mechanism is supported within a bracket without a gear case, and is sealed together with the drive motor by the bracket and cover.

<<Embodiment>> FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

This electrically foldable door mirror consists of a base 1 that is fixed to the door, and a shaft holder 2 that is attached to the base 1.
A fixed shaft 3 erected through the fixed shaft 3, a bracket 4 rotatably attached to the fixed shaft 3, and a pair of front and rear divided bodies 5 attached to the bracket 4.
It includes a mirror housing 5 consisting of a and 5b, a mirror body 7 attached to the bracket 4 via a tilting mechanism 6, a mirror 8 held by the mirror body 7, and a drive motor 9 built into the bracket 4. A drive mechanism and a switch mechanism 10 that detects the rotational position of the bracket 4 by this drive mechanism.
and a cover 11 attached to the front surface of the bracket 4 to cover the drive mechanism and the switch mechanism 10.

The base 1 is a vertical part 1 attached to the side of the door.
It has a horizontal part 1b projecting outward from the vertical part 1a, and is hollow inside, and as shown in FIG.
2 is inserted.

The shaft holder 2 is screwed and fixed to the horizontal portion 1b of the base 1, and a cord 12 is guided into the door mirror through the interior of a hollow fixed shaft 3. Further, the shaft holder 2 is formed with four recesses 14 in which three steel balls 13 mounted on the lower surface of the bracket 4 selectively engage. That is, when the bracket 4 is in a rotating position such as the mirror set position A, the rear storage position B, or the front storage position C, each steel ball 13 fits into each recess 14 and mechanically moves the bracket 4. It controls the position.

The tilting mechanism 6 is equipped with a set of motors inside, and as shown in FIG. By screwing a locking member 18 through a coil spring 17, the mirror body 7 is supported in a freely tiltable manner. The mirror 8 held by the mirror body 7 is adjusted and held at a desired angle by the operation of the tilting mechanism 6.

In addition, the bracket 4 has a cylindrical portion 19 formed in the center of the bottom into which the fixed shaft 3 is inserted, a storage portion 4a having an approximately semi-dome shape with an open front, and a frame to which the mirror housing 5 and the tilting mechanism 6 are attached. It has a support portion 4b having a shape. Storage part 4a
An arcuate notch corresponding to the cylindrical portion 19 is formed on the upper surface of the cylindrical portion 19 to allow the cord to pass through. Further, a groove 21 into which the upper edge of the cover 11 is inserted is formed extending from the upper part of the storage part 4a to the base end of the support part 4b.

On the other hand, the cover 11 covers the storage section 4 of the bracket 4.
It is formed in a semi-dome shape that is almost paired with the storage part 4a, and is installed from the front of the storage part 4a to seal it. A substantially semi-disc-shaped lid portion 22 is formed at the top of the cover 11 to close the upper surface opening 20 described above. This cover 11 is attached from the upper surface opening 20 of the bracket 4 to the groove 21 via a packing (not shown), and is attached to the housing part 4.
a.It is designed to ensure watertightness on the top surface. Further, a notch 23 for inserting the cord is formed in the lid 22, and a grommet 24 holding the cord 12 is attached to this notch 23, as shown in FIG. .

The drive mechanism is disposed on the outer side of the fixed shaft 3 in the vehicle width direction, and includes a drive motor 9 disposed within the storage portion 4a via the support plate 25, and a drive motor 9 disposed below the drive motor 9. It is configured with a reduction gear mechanism.

The support plate 25 is arranged horizontally and attached to the middle stage of the storage section 4a, and has a pair of mounting pieces 26 having insertion holes on both sides of the lower side. It is fixed in the storage part 4a by abutting from the front against a pair of boss parts 27 formed on both sides of the housing 4a and tightening the mounting screws 28 from the front. The support plate 25 has a large diameter hole 29 through which the fixed shaft 3 is inserted, and a pair of pedestals 30 and 31 on the upper surface of which the switch mechanism 10 is attached.

Further, the drive motor 9 is attached to the upper surface of the support plate 25, and an output shaft 9a protrudes from the lower part of the support plate 25.
The first worm gear 32 attached to the support plate 25 is disposed in the storage portion 4a in a state where it projects downward from the insertion hole of the support plate 25. In addition, the output shaft 9a
The tip of the worm gear 32 is inserted into and locked in a receiving hole 33 formed at the bottom of the storage portion 4a, so that the worm gear 32 can be firmly supported without being bent by the pressure applied in the radial direction.

In addition, the reduction gear mechanism, as shown in Fig. 3,
The first worm gear 32 mentioned above, the first worm wheel 34 that meshes with this, the second worm gear 35 that is integrally connected to this worm wheel 34, and the second worm wheel 36 that meshes with this, This worm wheel 36 has a planetary gear 37 formed of a spur gear integrally connected to the worm wheel 36, and the planetary gear 37 is connected to the fixed gear 38 on the fixed shaft 3 side.
It meshes with the The first worm wheel 34 and the second worm gear 35 are supported by a support shaft 40 attached to a pair of support pieces 39 formed on the lower surface of the support plate 25 . In addition, the second worm wheel 36 and the planetary gear 3
7 is a support shaft 41 attached to the bottom surface of the storage section 4a.
It is pivotally supported with the planetary gear 37 facing down. In this reduction gear mechanism, worm gear 3
By using 2, 35 and worm wheels 34, 36, the speed can be reduced efficiently with a small number of gears, and it can be installed in a small space. In addition, as mentioned above, each gear 32, 34, 3
5, 36, 37 are the output shaft 9a and each support shaft 40,
41 and covered by the bracket 4 and cover 11, a dedicated gear case is not required, and the installation space can be reduced accordingly.

The fixed gear 38 is rotatably attached to the cylindrical portion 19 of the bracket 4 described above, and is locked to the fixed shaft 3 via a clutch mechanism.

The clutch mechanism includes a clutch plate 42 fitted on the fixed shaft 3, and the fixed gear 38 on the outer periphery of the fixed shaft 3.
Coil spring 4 installed at the upper part
3, pressing the clutch plate 42 and the fixed gear 38 by the spring force of the coil spring 43,
A clutch pawl 44 formed on the fixed gear 38 and a clutch groove 45 formed on the clutch plate 42 are made to engage with each other. In other words, clutch plate 4
2, a fitting hole 42a formed in the center corresponds to a different diameter portion 3a that is flatly cut out on both sides of the fixed shaft 3, and rotation is restricted by this different diameter portion 3a. It is fitted in good condition. Further, the coil spring 43 is prevented from coming off by a push nut 46 mounted near the upper end of the fixed shaft 3, and presses the aforementioned clutch plate 42, and also presses the bracket 4 itself against the shaft holder 2.
The above-mentioned steel ball 13 is engaged with the recess 14. Further, a total of three clutch pawls 44 and three clutch grooves 45 are formed at 120° intervals in the circumferential direction of the fixed shaft 3. In such a clutch mechanism, the clutch pawl 4 is moved by the coil spring 43.
4 and the clutch groove 45, the fixed gear 38 is fixed to the clutch plate 42. When the load applied to the fixed gear 38 increases, the clutch pawl 44 and the clutch groove 45 separate against the spring force of the coil spring 43, resulting in a disengaged clutch state and the fixed gear 38 spinning idly. . In addition, in this clutch mechanism, in order from the top, the coil spring 43,
A clutch plate 42 and a fixed gear 38 are arranged, and the fixed gear 38 is arranged at the lowest side inside the bracket 4. Therefore, the planetary gear 37 that meshes with the fixed gear 38 is also disposed at the lowermost side of the bracket 4, and together with this, the positions of the reduction gear mechanism and the drive motor 9 are generally set toward the lower side. As a result, the housing portion 4a of the bracket 4 is also formed into a small, low-height shape, and the mirror housing 5 is
This makes it possible to increase the effective space inside.

The switch mechanism 10 also includes a pair of upper and lower insulating holders 47 and 48 that are locked to the upper end of the fixed shaft 3.
It has a structure in which a printed circuit board 49 attached to the above-mentioned support plate 25 is rotatably held between them. For example, the printed circuit board 49 has a fourth
As shown in the figure, a semi-circular pattern terminal 50 is provided in the rotation direction, and the holder 47 is provided with a pair of terminals 51 and 52 that contact the pattern terminal 50. and,
Due to the relative displacement between the holders 47 and 48 and the printed circuit board 50 as the bracket 4 rotates, one terminal 51 moves to one of the notches 50a, 50b, and 50c formed in the pattern terminal 50, and each Electricity is cut off between the terminals 51 and 52. Each notch 50
a, 50b, and 50c correspond to the three rotation angles of the mirror set position A, which is the normal use position of the door mirror, the rear storage position B when it is tilted backward, and the front storage position C when it is tilted forward. It is formed by Therefore, the switch mechanism 10 detects that the door mirror has rotated to a desired position by stopping the power supply to the terminals 51 and 52, and stops the operation of the drive motor 9.

This switch mechanism 10 locks the holders 47 and 48 to the different diameter portion 3b at the tip of the fixed shaft 3, and also attaches the printed circuit board 49 to the support plate 2 described above.
By fixing it to the pedestals 30 and 31 of No. 5, it is held at the upper part of the fixed shaft 3. That is, as shown in FIG. 1, a pair of locking holes 53 and 54 are formed in the printed circuit board 49.
As shown in FIG.
Regulating protrusions 55 and 56 formed at 0 and 31 are inserted. The printed circuit board 49 is thereby positioned. In addition, the pedestal parts 30, 3
1, the pedestal part 30 located on the opening side of the bracket 4 is formed with a boss part 30a that protrudes flush with the top surface of the mounted printed circuit board 49 and has a screw mounting hole. The pressing member 57 is screwed. That is, the pressing member 57 is screwed to the boss portion 30a at the proximal end, and has a locking hole 57a formed at the distal end extending toward the printed circuit board 49 so that the regulating protrusion 55 can be inserted. It's summery. Therefore,
By screwing and fixing the pressing member 57 to the boss portion 30a at the front position of the bracket 4, the printed circuit board 49 is held between the pedestals 30, 31 and the pressing member 57, and is attached to the fixed shaft 3 together with the holders 47, 48. It is designed to be held at the top. Particularly in this embodiment, since the pressing member 57 is locked at its distal end by the regulating protrusion 55, the boss portion 30
It can be firmly fixed by simply tightening the screws to a.
The work is extremely easy.

In the electrically foldable door mirror as described above, the bracket 4 incorporating the drive mechanism etc. can be configured to be extremely compact, so that the degree of freedom in designing the mirror housing 5 etc. can be increased. Therefore, as shown in FIG. 2, the base end portion of the mirror housing 5 located on the vehicle body side is cut out to be larger than the upper part.
It is also possible to form a gap 58 between the base 1 and the base 1, thereby making it possible to prevent wind noise.

<<Effect of the invention>> As explained above, according to the invention, the output of the drive motor can be efficiently reduced with a small number of gears by using a reduction gear mechanism using a worm gear and a worm wheel. A gear case for the mechanism becomes unnecessary. Therefore, it is possible to make the device smaller and lighter, and at the same time, it is possible to reduce costs.

Further, according to the present invention, the coil spring constituting the clutch mechanism is attached to the outer periphery of the fixed shaft at the upper part of the fixed gear that is locked to the fixed shaft, and the coil spring constituting the clutch mechanism is attached to the outer circumference of the fixed shaft, and A drive mechanism with a drive mechanism is housed in a relatively lower portion of the mirror housing. As a result, there is an extra space above the base end of the mirror housing, and this extra space is created by cutting out a large part of the base end of the mirror housing on the vehicle body side. It can be used as a ventilation gap formed between the end and the base, and is convenient for countermeasures against wind noise caused by door mirrors.In addition, the cover that covers the drive mechanism is attached to the front of the bracket. Since the bracket is mounted, the upper, lower, left and right sides of the bracket are covered by the mirror housing, and this reduces the phenomenon of water fogging of the drive mechanism, etc. due to rainwater or muddy walls when the vehicle is running, etc. Moreover, the joint between the bracket and the cover faces to the side, and as a result of the joint facing to the side, rainwater, muddy walls, etc. can enter from the front of the mirror housing, so it has excellent waterproof properties. There will be.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention;
Fig. 2 is a partially omitted vertical sectional view showing the internal assembly structure of the same embodiment, Fig. 3 is a horizontal sectional view showing the gear arrangement of the drive mechanism provided in the same embodiment, and Fig. 4 is a partially omitted vertical sectional view showing the internal assembly structure of the same embodiment. FIG. 5 is a plan view showing the pattern terminals and terminals of the switch mechanism provided, and a horizontal sectional view showing the mounting structure of the switch mechanism in the same embodiment. 1... Base, 2... Shaft holder, 3...
Fixed shaft, 4...Bracket, 5...Mirror housing, 6...Tilt mechanism, 8...Mirror, 9...Drive motor, 9a...Output shaft, 10...Switch mechanism, 11...Cover, 25... ...Support plate, 2
6...Mounting piece, 28...Mounting screw, 32...
First worm gear, 34... First worm wheel, 35... Second worm gear, 36...
Second worm wheel, 37... Planetary gear, 3
8... Fixed gear, 40, 41... Support shaft, 42...
Clutch plate, 43...Coil spring, 44...
...Clutch pawl, 45...Clutch groove, 47, 48
...Holder, 49...Printed circuit board, 50...Pattern terminal, 51, 52...Terminal,
53, 54... Locking hole, 55, 56... Regulating protrusion, 57... Pressing member.

Claims (1)

[Scope of utility model registration request] A base fixed to a door, a fixed shaft erected on the base, a bracket rotatably attached to the fixed shaft, a mirror housing attached to the bracket and covering the outside thereof, and the mirror housing. a mirror that is adjustable and held in the front opening of the bracket, and is driven by a drive mechanism provided in the bracket with a planetary gear that meshes with a fixed gear that is locked to the fixed shaft via a clutch mechanism; An electrically foldable door mirror that rotates the bracket,
The drive mechanism includes a drive motor and a reduction gear mechanism attached to the bracket, and the reduction gear mechanism includes a first worm gear attached to an output shaft protruding from a lower part of the drive motor; a first worm wheel that engages;
A second worm gear connected to the first worm wheel, a second worm wheel that meshes with the worm gear, and a planetary gear that is connected to a lower part of the second worm wheel and meshes with the fixed gear. Further, the clutch mechanism includes a clutch plate fitted to the fixed shaft, and a coil spring attached to the outer periphery of the fixed shaft above the fixed gear, and the clutch mechanism is configured to have a spring force of the coil spring. The plate is pressed against the fixed gear, and a clutch groove formed in the fixed gear is engaged with a clutch groove formed in the clutch plate, and a cover for covering the drive mechanism is attached to the front surface of the bracket. Electrically foldable door mirrors.