JPH0414285Y2 - - 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 reduction gear device (both not shown) are housed in the bracket 1, and the shaft 2 is rotated back and forth in the direction of an arcuate arrow RL. As the shaft 2 rotates back and forth, the mirror 3 assumes normal posture A (a state where it can function as a back mirror).
and storage position B.

[Problem that the invention attempts to solve]

The electric 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 some machines are subject to severe vibrations, so the base end of the shaft must be firmly supported to stabilize the mirror's support condition. .

(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 efforts 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 circumstances, and is (a) has a buffering function, (b) has a simple structure, (c) is suitable for industrial production, and is particularly easy to assemble, and ( d) The objective is to provide an electrically retractable outside mirror for trucks that can stably support a heavy mirror.

[Means for solving problems]

The structure of the present invention for achieving the above object will be explained with reference to FIG. 1 corresponding to the embodiment. A mirror (not shown) is fixed to the tip of the shaft 2, and The ends are supported by brackets 4. The shaft 2 is rotated by an electric motor 5 via a reduction gear device 6 comprising a plurality of reduction gears and a clutch device to be described later.

The bracket is configured in a box shape, and
A tubular shaft 7 that vertically passes through the box-shaped bracket.
and the box-shaped bracket 4 is configured by the tubular shaft.
A flange 2a having a tapered hole-like concave surface is fixed to the shaft 2, and a shaft holder 7b having a tapered shaft-like outer peripheral surface is fixed to the shaft 2. The shaft 2 is fitted into the tubular shaft 7, and the tapered hole-shaped concave surface of the flange 2a and the tapered shaft-shaped outer circumferential surface of the shaft holder 7b are tightly fitted to fix the flange 2a. The shaft 2 and the tubular shaft 7 to which the shaft holder 7b is fixed are fixed to each other, and the receiving gear 6a of the final stage among the plural stages of reduction gears constituting the reduction gear device 6 is connected to the tubular shaft 7.
At the same time, the clutch receiving plate 9 of the clutch device is fitted to the tubular shaft 7 so as to be relatively unrotatable and slidable, and the coil spring 10 The receiving plate 9 is pressed toward the receiving gear 6a, and the receiving gear 6a is also used as a clutch base plate to constitute the clutch device.

[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 device formed between the clutch receiving plate and the receiving gear. Therefore, when subjected to excessive external force, the clutch device slips or comes off, fulfilling its buffering function.

Furthermore, the above-mentioned clutch device has a structure in which it is assembled to a tubular shaft that is fitted onto the shaft, and the tubular shaft and the shaft are fixed by fitting a tapered hole and a tapered shaft, so that it can be assembled quickly and easily. is possible and has excellent productivity.

〔Example〕

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

Figure 1 is a cross-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 reduction gear device 6 therein. The reduction gear device 6 of this example has four reduction stages as shown in FIGS. 1 and 2, and the first stage is the electric motor 5.
The second stage is a spur gear reduction stage, and the third stage is a worm reduction stage. In this embodiment, the fourth stage is the final spur gear reduction stage, and 6a is the receiving gear of the final stage. This final stage receiving gear 6a
is a member that also serves as a clutch base plate of the clutch device, as will be described later.

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 _8c fitted to the lower bracket via a tubular shaft 7 fitted externally thereto.

In the assembled state shown in FIG. 1, the tubular shaft 7 is fixed to the shaft 2 as described below. The rotational output of the electric motor 5, which has been reduced in speed by the reduction gear device 6, is transmitted to the shaft 2 via the tubular shaft 7 by a clutch device, which will be described below.

The receiving gear 6a is rotatably fitted onto the tubular shaft 7, and the clutch receiving plate 9 is fitted onto the tubular shaft 7.
The receiving gear 6a and the clutch receiving plate 6a are fitted in a relatively unrotatable but slidable manner. Then, a coil spring 10 is constructed and compressed and interposed between the middle bracket 4b and the clutch receiving plate 9, and the clutch receiving plate 9 is connected to the receiving gear 6a.
Press towards. As a result, the receiving gear 6a also functions as a clutch base plate.

11 and 11' are washers, 12 is a push nut, and 13 is an O-ring for waterproofing.

As shown in FIG. 2, the clutch receiving plate 9 is provided with a through hole 9a having two parallel surfaces, and is fitted onto the tubular shaft 7 so as not to rotate.

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

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

The tubular shaft 7 is provided with two parallel surfaces 7 _a (FIG. 2), and a shaft holder 7 _b having a tapered surface tightly fitted to the tapered surface of the flange 2 _a is fixed thereto.

When assembling the above-mentioned components (Fig. 1) on an industrial production line, the parts shown in _FIG . 3) is constructed as an assembled part in advance, and the shaft 2 shown in phantom lines in _FIG . When attached and screwed together as shown in FIG. 1, the assembly is completed as shown in FIG. 1, and the tapered surface of the flange _2a and the tapered surface of the shaft holder _7b are strongly pressed and fixed. When the present invention is applied, the time required and the number of man-hours required on the assembly line are thus significantly reduced.

When implementing the present invention, as shown in Figure 4A,
When the shaft holder _7b is provided with the projection 7b _-1 and the flange _2a is provided with the through hole 2a _-1 and the two are fitted together, the rotational locking of both members becomes more reliable.

In addition, as shown in FIG. 4B, the shaft holder 7
In addition to providing the protrusion 2 _a-2 on the flange, a protrusion 2 _a-2 may also be provided and fitted.

By providing a ball spring means 15 on the top surface of the upper bracket _4a and a locking recess 7b _-1 (Fig. 1) on the bottom surface of the shaft holder _7b , the shaft 2 can be stopped at a predetermined rotation angle. Functionality becomes more reliable.

Reference numeral 16 denotes a switch that is opened and closed as the shaft 2 rotates. When the switch 16 is used 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, the buffering function can be achieved with a simple structure, and even a heavy mirror can be stably supported.

In particular, productivity is excellent because the bracket and its storage member are prepared in advance as assembled parts, and the shaft supporting the mirror can be quickly and easily attached and assembled.

[Brief explanation of the drawing]

1 to 3 show one embodiment of the present invention,
FIG. 1 is a sectional view, FIG. 2 is an exploded perspective view, and FIG. 3 is an explanatory diagram of the assembly work. Figure 4A and Figure 4B
These are explanatory diagrams of embodiments different from those described above. FIG. 5 is a schematic external perspective view of an electrically retractable outside mirror for a truck. 1... Bracket, 2... Shaft, 2 _a ...
Flange, 3...Mirror, 4...Bracket, 4
_a ... Upper bracket, 4 _b ... Middle bracket,
4 _c ...Lower bracket, 5...Electric motor, 6...
Reduction gear device, 6a... Receiving gear, 7... Tubular shaft,
7b...Shaft holder, 8a, 8c...Button, 9...Clutch receiving plate, 13...O ring, 1
6...Switch.

Claims (1)

[Scope of Claim for Utility Model Registration] A shaft on which a mirror is attached is rotatably supported on a bracket, and an electric motor housed in the bracket is used to reduce the number of gears via a reduction gear device consisting of multiple stages of reduction gears and a clutch device. The electric outside mirror for a truck has a structure in which the shaft is rotated to store and extend the mirror attached to the shaft, and the bracket is configured in a box shape, and
A tubular shaft is configured to vertically penetrate the box-shaped bracket, and the box-shaped bracket is rotatably supported by the tubular shaft, and the shaft has a flange provided with a concave surface in the form of a tapered hole. At the same time, a shaft holder having a tapered shaft-shaped outer peripheral surface is fixed to the tubular shaft, and the shaft is fitted into the tubular shaft, and the tapered hole-shaped concave surface of the flange and the tapered shaft of the shaft holder are fixed. The outer circumferential surface of the shape is fitted and brought into close contact.
The shaft to which the flange is fixed and the tubular shaft to which the shaft holder is fixed are fixed to each other, and the receiving gear at the final stage among the plural stages of reduction gears constituting the reduction gear device is connected to the tubular shaft. At the same time, the clutch receiving plate of the clutch device is fitted to the tubular shaft so as to be relatively unrotatable and slidable, and the clutch receiving plate is connected to the receiving plate by a spring means. 1. An electrically retractable outside mirror for a truck, characterized in that said clutch device is constructed by pressing toward a gear and said receiving gear also serving as a clutch base plate.