JPH0322041Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to an electric stay retractable mirror used in large vehicles and the like.

[Conventional technology]

In 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 rotated by a drive motor installed in the bracket case. It is known that the mirror supported at the tip of the mirror is moved toward the vehicle body.

[Problem that the invention attempts to solve]

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 supported by a relatively small bracket case, so a small amount of space inside the bracket case is used. The backlash is enlarged on the tip side,
There is a risk that the mirror may vibrate. In particular, the base end of the stay is subject to 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. Moreover, since the stay is directly rotated by the drive motor, there is a problem in that the drive device such as the drive motor becomes large. SUMMARY OF THE INVENTION 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, and can also make the drive device relatively compact.

[Means to solve the problem]

An electric stay retractable mirror in which the proximal end of the stay supporting the mirror at the distal end is attached to a support shaft rotatably held in a bracket case, and the support shaft is rotated by a drive device, the support A flange is formed at the upper end of the shaft, and a reduced diameter part is formed at the lower end of the support shaft, and a driven gear that meshes with the drive gear of the drive device is loosely fitted into the reduced diameter part with a certain amount of play. In addition, it is installed movably in the axial direction,
A second locking means is formed by inserting a ball into a recess provided in a portion of the driven gear and a portion of the bracket case facing the driven gear, respectively, and a second locking means is formed in one of the flange portion and a portion of the bracket case facing the flange. A spring for providing a first locking means by forming a groove in the other protrusion to fit into the protrusion, and further maintaining the fitted state of the first locking means and the second locking means. is interposed on the support shaft, and the drive device first rotates the driven gear by a certain amount of play, that is, until it comes into contact with the reduced diameter portion of the support shaft, thereby causing the support shaft to resist the biasing force of the spring. and moving it upward to release the fitted state of the first locking means and the second locking means, and then the support shaft is rotated via the driven gear. Features.

[Effect]

When the drive device retracts the mirror from its normal position or returns it from the stored position to its normal position, the drive gear is rotated by the drive motor of the drive device, causing the driven gear to rotate by a certain angle. After the first and second locking means are released, the support shaft rotates and the stay rotates. Conversely, when a large load is applied to the stay, the engagement is released by the first and second locking means and the clutch is disengaged, thereby preventing burnout of the drive motor.

【Example】

FIG. 1 is a side view showing an embodiment 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. In addition, the base end of the stay 1 is attached to a bracket case 4 attached to the vehicle body 3.
It is designed to be rotated by an internal drive device 5. The bracket case 4 is a drive device 5 for the stay 1.
A substantially cylindrical main body bracket 41 in which the main body bracket 41 is housed, and an upper lid 4 that closes the main body bracket 41 from above.
2 and a lower lid 43 which is closed from below, and each bandage bracket 41 and the lid 43, which serves as an upper lid 42, are joined by screws. FIG. 2 is a sectional view showing the internal structure of the bracket case 4 that supports the stay 1, and FIG. 3 is an exploded perspective view of the main parts thereof. The drive device 5 basically includes a gear mechanism 52 for transmitting the output of the drive motor 51, a clutch mechanism 53, a drive gear 54, and a drive gear 54 attached to the support shaft 6.
The support shaft 6 that supports the stay 1 is rotated by the drive device. The support shaft 6 has a locking means 6 on the upper cover 42 and the lower cover 43.
1 and 62 are rotatably supported. A fitting hole 63 is cut in the support shaft 6 in the axial direction from the upper end, and the base end of the stay 1 inserted from the upper lid 42 side is fixed into the fitting hole 63 by press fitting. Note that 7 is a cover. Furthermore, to explain in detail, the support shaft 6 has a flange 64 that is slidably pressed toward the upper lid 42 side (upper end side).
And, on the lower lid 43 side (lower end side), there is a reduced diameter part 6 whose outer peripheral part has a circular cross section and a part of the opposing surface is flat.
5 is inserted into a shaft hole having a shape that is substantially similar to the cross-sectional shape of the reduced diameter portion 65 of the driven gear and has a certain play, so that the driven gear 55 is idle with a certain play with respect to the support shaft 6. It is fitted (see Fig. 4) and is mounted so as to be movable in the axial direction. A first locking means 61 is provided between the upper cover 42 and the flange 64, and a second locking means 62 is provided between the lower cover 43, the pressing plate 9, and the driven gear 55 via the push nut 59. It is formed. The first locking means 61 is pressed by a coil spring 8 interposed in the support shaft 6, and has a groove 64a formed on the back side of the flange 64.
and the insertion hole 42 of the support shaft 6 of the upper cover 42, which is the part where the flange part 64 of the bracket case 4 faces.
The protrusions 42b formed around the a and the protrusions 42b are fitted into each other. The second locking means 62 is connected to the recess 55a of the driven gear 55 and the driven gear 5 of the bracket case 4.
A hole 43a formed in the lower lid 43, which is the portion facing the ball 5, and a ball 55b inserted into the hole 43a and the recess 55a constitute a second locking means using unevenness. The cross-sectional shape of the recess 55a is inclined in a substantially dish-like cross section from the center to the outer periphery, so that the ball 55b can ride on the recess 55a. The locking means 61 and the locking means 62 are arranged so that the drive gear 54 is rotated by the drive motor 51 of the drive device 5, and the rotation is transmitted to the driven gear 55, as shown in FIG. When the driven gear 55 comes into contact with the reduced diameter portion 65 of the support shaft 6, the support shaft 6
moves upward to release the engagement between the ball 55b of the second locking means 62 and the recess 55a of the driven gear 55, and at the same time disengage the engagement between the protrusion 42b and the groove 64a of the locking means 61. Each engaging portion is arranged and configured so as to be released. Further, the clutch mechanism 53 is achieved by the engagement of the driving gear 54 that meshes with the driven gear 55 and the uneven portions 54a and 54b formed on the lower surface of the pressing plate 56, respectively. A coil spring 54 is interposed between the pressing plate 56 and the reduction gear mechanism 52, and presses the pressing plate 56 against the drive gear 54. Note that push nuts 58 and 59 elastically lock the drive gear 54 and the driven gear 55 to the support shaft 6 and the drive shaft 5a of the drive mechanism 5 in the axial direction, respectively. Therefore, the drive gear 54 provided at the output stage of the reduction gear mechanism 52 is driven by the drive motor 51 of the drive device 5.
When the driven gear 55 rotates by a certain angle, the first and second locking means 61, 62
After releasing the support shaft 6 rotates and the stay 1 rotates, and on the other hand, when the load applied to the stay 1 is large, the first locking means 61 and the second locking means 62
Further, the engagement is released by the clutch mechanism 53 and the clutch is in a disengaged state, thereby preventing the drive motor 51 from burning out or the like. FIG. 5 shows a second embodiment of the present invention, in which the locking means 62 is connected to the driven gear 55.
Irregularities 62 formed on the lower surface and the upper surface of the lower lid 43
d and 62e, and this example also operates in the same way as the first example.

[Effect of the idea]

As described above, according to the present invention, the flange portion of the support shaft is slidably pressed against the bracket case by the elastic force of the coil spring, so that the support shaft is held without wobbling, and the stay is kept in a stable state. It can be supported by Furthermore, since the support shaft that rotates the stay rotates after releasing the flange portion and the first and second locking means of the driven gear, it can be rotated by a relatively small drive mechanism, and the device can be rotated. It is possible to downsize and save labor.

[Brief explanation of the drawing]

Figure 1 is a side view showing one embodiment of the present invention;
The figure is a sectional view showing the internal structure of the bracket case that supported the stay in the same embodiment, Figure 3 is an exploded perspective view showing the main structure inside the bracket case, and Figure 4 is a diagram showing the operating state of the support shaft and driven gear. In the figure, A is a cross-sectional view showing the driven gear before rotation;
FIG. 5 is a sectional view showing the second embodiment of the present invention. 1... Stay, 2... Mirror body, 3... Vehicle body, 4... Bracket case, 41... Main body bracket, 42b... Projection, 43a... Hole, 5...
Drive device, 51... Drive motor, 52... Reduction gear mechanism, 53... Clutch mechanism, 54... Drive gear, 55... Driven gear, 55a... Recess, 55b
...Ball, 55c...Constant play, 6...Support shaft, 61, 62...Locking means, 62d, 62e...
...Uneven portion, 64...Flange, 64a...Reduced diameter portion, 65...Bearing, 8...Spring.

Claims (1)

[Scope of utility model registration request] An electric stay retractable mirror in which the proximal end of the stay supporting the mirror at the distal end is attached to a support shaft rotatably held in a bracket case, and the support shaft is rotated by a drive device, the support A flange is formed at the upper end of the shaft, and a reduced diameter part is formed at the lower end of the support shaft, and a driven gear that meshes with the drive gear of the drive device is loosely fitted into the reduced diameter part with a certain amount of play. In addition, it is installed movably in the axial direction,
A second locking means is formed by inserting a ball into a recess provided in a portion of the driven gear and a portion of the bracket case facing the driven gear, respectively, and a second locking means is formed in one of the flange portion and a portion of the bracket case facing the flange. A spring for providing a first locking means by forming a groove in the other protrusion to fit into the protrusion, and further maintaining the fitted state of the first locking means and the second locking means. is interposed on the support shaft, and the drive device first rotates the driven gear by a certain amount of play, that is, until it comes into contact with the reduced diameter portion of the support shaft, thereby causing the support shaft to resist the biasing force of the spring. and moving it upward to release the fitted state of the first locking means and the second locking means, and then the support shaft is rotated via the driven gear. Features an electric stay retractable mirror.