JPH0322040Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention supports a shaft to which a mirror is attached rotatably with respect to a bracket, and uses an electric motor and a reduction gear device housed in the bracket to This invention relates to an electric outside mirror for a truck, which has a structure in which a shaft is rotated to store and extend a mirror attached to the shaft.

[Prior art]

FIG. 5 is an external view of this type of outside mirror.

The bracket 1 is used by being fixed to the vehicle body. This bracket rotatably supports the base end of a crank-shaped shaft 2, and a mirror 3 is attached to the distal end of the shaft 2.

An electric motor and a group of reduction gears (both not shown) are housed in the bracket 1, and the shaft 2 is rotated back and forth in the direction of the circular arc arrow RL.
Along with the reciprocating rotation of the shaft 2, the mirror 3 assumes a normal posture A (a state in which it can function as a back mirror),
It is extended and stored between the storage position B and the storage position B.

[Problem that the invention attempts to solve]

The electrically retractable outside mirror for trucks described above must satisfy the following performance requirements.

(a) In particular, outside mirrors for trucks are large and heavy, and are subject to severe vibrations, so the base end of the shaft must be firmly supported to stabilize the mirror's support state.

(b) Since the outside mirror is used by protruding to the side of the vehicle body (normal position A), it cannot be said that there is no chance that it will collide with an external obstacle and receive an impact force in the direction of arrow C. When receiving such an external force, it is desired that it be easily rotated in the direction of arrow L to perform a buffering function.

Various attempts have been made to provide the functions (a) and (b) above, but they are simple and inexpensive.
Moreover, an electrically retractable outside mirror for trucks with a structure suitable for industrial production has not yet been developed. In particular, there is no suitable outside mirror for trucks that can stably support a heavy mirror.

The present invention was developed in view of the above-mentioned circumstances, and is (a) has a buffering function, (b) has a simple structure, (c) is suitable for industrial production, and (d) is a mirror with a large weight. The purpose of this invention is to provide an electrically retractable outside mirror for trucks that can stably support the vehicle.

[Means for solving problems]

In order to achieve the above object, the present invention rotatably supports a shaft on which a mirror is attached to a bracket, and rotates the shaft by an electric motor and a reduction gear device housed in the bracket. , an electric outside mirror for a truck having a structure in which a mirror attached to the shaft is stored and extended; Bearings are provided at locations that penetrate through the top and bottom surfaces of the shaft to rotatably support the shaft, and a receiving gear is rotatably fitted onto the shaft, and the receiving gear is connected to the electric motor via a group of reduction gears. The clutch receiving plate is fitted onto the shaft while being locked in rotation relative to the shaft, and the clutch receiving plate is brought into close contact with the side surface of the receiving gear. A coil spring is compressed between the plate and the inner wall of the box-shaped bracket to press the clutch receiving plate toward the receiving gear, and the shaft protrudes through the top surface of the box-shaped bracket. A shaft holder facing the top surface is fixed, and a ball spring means is provided on the top surface of the box-shaped bracket, and the shaft holder is fixed to the surface facing the top surface of the box-shaped bracket. It is characterized by providing a recess that engages with the ball of the ball spring means.

[Effect]

In the electric retractable outside mirror for trucks constructed as described above, the receiving gear and the clutch receiving plate are pressed by a coil spring.
The transmission of the driving force for rotating the shaft and the transmission of the braking force for stopping rotation of the shaft are transmitted via the clutch mechanism formed between the clutch receiving plate and the receiving gear. Therefore, when subjected to excessive external force, the clutch mechanism slips or comes off, fulfilling its buffering function.

Furthermore, since the base end of the shaft is supported by bearings provided on the top and bottom of the box-shaped bracket, it is easy to increase the distance between the pair of bearings, and thus Stable support is easy.

Moreover, due to the action of the ball spring means, the bearing condition of the shaft is always ensured.

〔Example〕

Next, one embodiment of the present invention will be described with reference to FIGS. 1 and 2.

Figure 1 is a sectional view of the electric retractable outside mirror for trucks according to this embodiment, near the bracket.
The figure is also an exploded perspective view (partially cut away).

The bracket 4 of this example has a box shape and is constructed by combining an upper bracket 4a, a middle bracket 4b, and a lower bracket 4c, and houses an electric motor 5 and a group of reduction gears 6 therein. 6a is the final stage receiving gear.

The shaft 2 is made of a tubular member and passes through the bracket 4 in the upper and lower directions. The shaft 2
is supported by a bush 8a fitted to the upper bracket and a bush 8b fitted to the lower bracket via a tubular shaft 7 fitted externally thereto.

The receiving gear 6a is loosely fitted onto the shaft 2, overlapped with the clutch receiving plate 9 loosely fitted onto the shaft 2, and a pressing force is applied by the coil spring 10. 11 and 11' are washers, and 12 is a push nut. 13 is an O-ring, which has a waterproof function.

The clutch receiving plate 9 is provided with a through hole having two parallel surfaces as shown in FIG.
It is fitted externally with rotation being locked against it.

The tubular shaft 7 and the shaft 2 are fixed to each other in the following manner.

A flange 2a having a tapered surface in the downward opening direction is fixed to the shaft 2, and a female thread 2b is cut at the lower end thereof.

The tubular shaft 7 is provided with two parallel surfaces 7a (FIG. 2) and has a shaft holder 7b fixed thereto, which has a tapered surface that closely fits into the tapered surface of the flange 2a.

When the bolt 14 is screwed into the female thread 2b of the shaft 2 and tightened, the tapered surface of the flange 2a and the tapered surface of the shaft holder 7b are strongly pressed and fixed together.

When implementing the present invention, as shown in FIG. 3, if the shaft holder 7b is provided with a protrusion 7b _-1 and the flange 2a is provided with a through hole 2a _-1 and the two are fitted together, both members will be Rotational locking becomes so certain.

Further, as shown in FIG. 4, the shaft holder may be provided with a hole 7 _b-2 , and the flange may be provided with a protrusion 2 _{a-2 for} fitting.

A ball spring means 15 is provided on the top surface of the upper bracket 4a, and an engagement recess 7b _-1 (FIG. 1) is provided on the bottom surface of the shaft holder 7b to provide the function of stopping the shaft 2 at a predetermined rotation angle. Make it more certain.

Reference numeral 16 denotes a switch that is opened and closed as the shaft 2 rotates. When the switch 16 is connected to open and close the circuit of the motor 5,
It is possible to automatically stop the rotation of the mirror during extension and storage operations.

[Effect of idea]

As described in detail above, by applying the present invention, a buffering function can be achieved with a simple structure, and even a heavy mirror can be stably supported.
In particular, bearings are provided at the locations where the shaft passes through the top and bottom surfaces of the box-shaped bracket.
The spacing between the two bearings can be widened, and this, together with the action of the ball spring means, provides an excellent practical effect in that the mirror is supported stably and reliably.

[Brief explanation of drawings]

1 and 2 show one embodiment of the present invention,
FIG. 1 is a sectional view, and FIG. 2 is an exploded perspective view. FIGS. 3 and 4 are explanatory diagrams of embodiments different from those described above, respectively. FIG. 5 is a schematic external perspective view of an electrically retractable outside mirror for a truck. 1... Bracket, 2... Shaft, 2a...
Flange, 3...Mirror, 4...Bracket, 4
a... Upper bracket, 4b... Middle bracket, 4c... Lower bracket, 5... Electric motor, 6
. . . Reduction gear group, 6a . . . Receive gear, 7 .

Claims (1)

[Claims for Utility Model Registration] A shaft on which a mirror is attached is rotatably supported with respect to a bracket, and the shaft is rotated by an electric motor and a reduction gear device housed in the bracket. In the electric outside mirror for a truck, which has a structure in which the attached mirror is stored and extended, the bracket is configured in a box shape and passes through the base end of the shaft vertically, and the shaft extends between the top surface of the box-shaped bracket and the base end of the shaft. A shaft is rotatably supported by providing a bearing at each point penetrating the bottom surface, and a receiving gear is rotatably fitted onto the shaft, and the receiving gear is driven by an electric motor via a group of reduction gears. The clutch receiving plate is fitted onto the shaft with its rotation locked relative to the shaft, and the clutch receiving plate is brought into close contact with the side surface of the receiving gear. A coil spring is compressed and interposed between the inner wall of the box-shaped bracket to press the clutch receiving plate toward the receiving gear, and the shaft protrudes through the top surface of the box-shaped bracket. A shaft holder facing the top surface is fixed, and a ball spring means is provided on the top surface of the box-like bracket, and the ball spring means is provided on the surface of the shaft holder facing the top surface of the box-like bracket. An electrically retractable outside mirror for a truck, characterized by having a recess that engages with a ball of the means.