JPH0322039Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an electric stay retractable mirror used in large vehicles and the like.

<Prior art> As this type of electric stay retractable mirror, the base end of the stay is rotatably supported in a bracket case attached to the vehicle body, and the stay is driven by a drive motor provided in the bracket case. There is a known mirror that rotates to move the mirror supported by the tip of the stay toward the vehicle body.

<Problems to be solved by the invention> However, in the case of such electric stay retractable mirrors, a relatively long stay with a mirror or mirror body attached to the tip is housed in a relatively small bracket case. Since the mirror is supported by a mirror, there is a risk that slight play within the bracket case will be magnified on the tip side, causing the mirror to vibrate. In particular, the base end of the stay is subject to a radial load due to power transmission from the drive motor, and the mirror body on the tip side is subject to wind resistance, so looseness between the bracket case and the stay is likely to occur. I get used to it.

Therefore, an object of the present invention is to provide an electric stay retractable mirror that can support the stay in a stable state without wobbling.

<Means for Solving the Problems> The electric stay retractable mirror of the present invention has a support shaft 1 rotatably held in a bracket case 4, which supports the base end of the stay 1 that supports the mirror at the tip.
2, and the support shaft 12 is rotated by a drive motor 9. A driven gear 18 of the drive motor 9 is loosely fitted to the support shaft 12, and the driven gear 18 and the support The friction clutch mechanism 11 is rotationally connected to the shaft 12 via a friction clutch mechanism 11, and the friction clutch mechanism 11 connects the support shaft 12 with friction plates 16 on both upper and lower surfaces of the driven gear 18, respectively, which are rotatable with respect to the support shaft 12. A receiving plate 17 that rotates integrally with the shaft 12 and is movable in the axial direction is overlapped with the supporting plate 17, and a large diameter flange formed at the upper end of the support shaft 12 is attached to the receiving portion 6c formed inside the bracket case 4. A coil spring 19 wound around the support shaft 12 is compressed between a large-diameter flange portion 12b formed on the support shaft 12 so as to press against it and the upper inner receiving plate 17 of both receiving plates 17. It is characterized by having been configured.

<Operation> The flange portion of the support shaft is pressed against the receiving portion in the bracket case by the elastic force of the coil spring, so that the support shaft is held without wobbling, and the stay is supported in a stable state.

<Example> FIG. 1 is a side view showing an example of the present invention. A mirror body 2 holding a mirror (not shown) is attached to the tip of the stay 1 bent into a substantially crank shape. Further, the base end portion of the stay 1 is incorporated into a bracket case 4 attached to a vehicle body 3, and is configured to be rotated by a drive device provided inside the bracket case 4.

FIG. 2 is an exploded perspective view showing the internal structure of the bracket case 4 that supports the stay 1, and FIG. 3 is a sectional view showing the assembled state.

The bracket case 4 includes a substantially cylindrical main body bracket 5 in which a driving device for the stay 1 is housed, an upper bracket 6 that closes the main body bracket 5 from above, and a lower bracket 7 that closes the main body bracket 5 from below. The brackets 5, 6, and 7 are connected by screws, and a lid 8 is attached to a notch 7a for operation formed in the lower bracket 7 to form a substantially housing-like structure, as shown in Fig. 4. As shown, attach the mounting piece 6a formed on the top surface of the upper bracket 6 to the vehicle body 3.
It is fixed by screwing it into place.

Further, as shown in FIGS. 2 and 3, the drive device rotates the support shaft 12 that supports the stay 1 by using the output of the drive motor 9 via a reduction gear mechanism 10, a friction clutch mechanism 11, etc. be.

The support shaft 12 has a pair of upper and lower sleeves 13, 1 attached to the upper bracket 6 and the lower bracket 7.
A fitting hole 15 is cut in the upper end in the axial direction, and the base of the stay 1 inserted through the insertion hole 6b of the upper bracket 6 is inserted into the fitting hole 15. The ends are fixed by press fitting.

Further, the friction clutch mechanism 11 includes a drive gear 21
A receiving plate 17 is superimposed on both upper and lower surfaces of a driven gear 18 that meshes with a friction plate 16, and the narrow diameter portion 1 formed at the lower end of the support shaft 12
2a. In other words,
This narrow diameter portion 12a is shaped like a rod of different diameters with flat notches on both sides, and a driven gear 18 with a circular insertion hole and each friction plate 16 are rotatable. Each receiving plate 17 having corresponding engagement holes of different diameters is positioned in a rotational direction and is movable in an axial direction. The driven gear 18, each friction plate 16, and each receiving plate 17 are connected to a coil spring 19 disposed in the middle of the support shaft 12.
and a washer 2 attached to the lowermost end of the support shaft 12.
The friction plate 1 is assembled with the friction plate 1 sandwiched between the
The rotation of the driven gear 18 is transmitted to the receiving plate 17 by the frictional force of 6, thereby rotating the support shaft 12 and the stay 1. Therefore, the drive gear 2 provided at the output stage of the reduction gear mechanism 10 is driven by the drive motor 9.
When the stay 1 rotates, the stay 1 rotates together with the driven gear 18. Conversely, when the load applied to the stay 1 is large, slipping occurs between the friction plate 16 and the receiving plate 17, resulting in a clutch disengaged state, and the drive motor 9 This prevents burnout, etc. The rotation angle of the stay 1 by such a drive device is detected by detecting the groove 30 formed in the support shaft 12 with a limit switch 31, as shown in FIG. By operating the switch, as shown in FIG. 6, the mirror can be placed in the set position A when in use, the rear storage position B where the mirror is folded backwards, and the front storage position where the mirror is folded forward and folded into the front of the vehicle body 3. 3 of C
Rotation can be controlled to two rotation angles.

Further, the support shaft 12 is biased upward by a coil spring 19, as shown in FIGS. 2 and 3. That is, a large-diameter flange portion 12b is formed at the upper end of the support shaft 12, and the coil spring 19 is compressed and interposed between the flange portion 12b and the friction clutch mechanism 11 described above, and the coil spring 19 is compressed to move the support shaft 12 upward. It is energizing. Also,
The upper end surface of the support shaft 12 has a large area due to the flange portion 12b formed flush with the support shaft 12, and is connected to a receiving portion 6c formed on the inner wall surface of the upper bracket 6 via a friction plate 22. It is now being pressed into contact. Therefore, the support shaft 12 is received by the upper bracket 6 over a large area, is held in a stable state, and can be slid smoothly by the friction plate 22. This prevents even a small play in the support shaft 12, and provides strong support for the stay 1.

Further, a pair of protrusions 23a, 23b are formed on the lower surface of the flange portion 12b, and each protrusion 23a, 23b is formed inside the main body bracket 5.
A protrusion 24 is formed that engages with. These protrusions 23a, 23b, and 24 are for regulating the rotation angle of the support shaft 12, and are designed to allow the stay 1 to rotate only between the front storage position C and the rear storage position B described above. There is. In other words, stay 1
When the stay 1 rotates to the front storage position C, the protrusions 23a and 24 on one side come into contact to prevent further rotation, and conversely, when the stay 1 rotates to the rear storage position B, the protrusions 23b and 24 on the other side. is designed to prevent further rotation. This prevents the stay 1 from rotating more than necessary and colliding with the vehicle body 3, thereby avoiding damage to mirrors and the like. Note that the formation positions of such protrusions 23a, 23b, and 24 are not limited to those shown in the drawings, and can be changed as appropriate.

In addition, a cord insertion hole 2 is provided in the axial center of the support shaft 12.
5 is formed. A cord 26 guided from the mirror body 2 through the hollow pipe-shaped stay 1 is inserted into the cord insertion hole 25 and guided into the vehicle body 3 through the notch 7a of the lower bracket 7. This code 26 is for an automatic dimming device or a mirror tilting device provided in the mirror body 2, for example. With this configuration, the cord 26 is guided to the vehicle body 3 through the center of rotation of the stay 1, so that tension or loosening caused by the rotation of the stay 1 is minimized, and the cord 26 is Disconnection, poor connection, etc. do not occur, and the wiring of the cord 26 becomes easier.

Further, in the above embodiment, the friction plate 2 is provided between the upper end surface of the support shaft 12 and the receiving portion 6c of the upper bracket 6.
2, but as shown in FIG.
Three protrusions 27 are formed radially on the support shaft 1.
Alternatively, as shown in FIG.
8 may be formed, and a bearing 29 may be attached to each groove portion 28 to receive the support portion.

<Effects of the invention> As explained above, according to the invention, the flange portion of the support shaft is pressed against the receiving portion in the bracket case by the elastic force of the coil spring, so that the support shaft is held without wobbling. The stay can be supported in a stable state.

[Brief explanation of drawings]

Figure 1 is a side view showing one embodiment of the present invention;
The figure is an exploded perspective view showing the internal structure of the bracket case that supported the stay in the same embodiment, and FIG. 3 is a sectional view showing the structure inside the bracket case.
Fig. 4 is a front view showing the bracket case, Fig. 5 is a plan view showing the bracket case, Fig. 6 is a plan view showing the rotation range of the stay, and Fig. 7 is a main view showing another embodiment of the present invention. Partially exploded perspective view. FIG. 8 is a partially exploded perspective view showing still another embodiment of the present invention. 1... Stay, 4... Bracket case, 6c
... Reception part, 9 ... Drive motor, 11 ... Friction clutch mechanism, 12 ... Support shaft, 12b ... Large diameter flange section, 16 ... Friction plate, 17 ... Reception plate,
18...driven gear, 19... coil spring.

Claims (1)

[Scope of utility model registration request] An electric stay retractable mirror in which the base end of the stay 1 supporting the mirror at the tip is attached to a support shaft 12 rotatably held in a bracket case 4, and the support shaft 12 is rotated by a drive motor 9. A driven gear 18 of the drive motor 9 is loosely fitted onto the support shaft 12, and the driven gear 18 and the support shaft 12 are rotationally coupled via a friction clutch mechanism 11. , the driven gear 1
A receiving plate 17 that rotates integrally with the support shaft 12 and is movable in the axial direction is superimposed on both upper and lower surfaces of the support shaft 12 through friction plates 16 that are rotatable with respect to the support shaft 12, respectively. The large diameter flange portion 12b formed at the upper end of the support shaft 12 and the both receiving plates 17 are pressed together to press the large diameter flange portion 12b formed at the support shaft 12 against the receiving portion 6c formed in the bracket case 4. An electric stay retractable mirror characterized in that a coil spring 19 wound around the support shaft 12 is compressed between an inner upper receiving plate 17.