JP2548021Y2 - Shock-absorbing door mirror - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shock-absorbing door mirror, and more particularly, to a shock-absorbing door mirror having a groove / ridge engaging type clutch in the transmission system.

[Conventional technology]

Since the door mirror is mounted so as to protrude to the side of the vehicle body, there is an opportunity to collide with an external obstacle during traveling. Also,
There is also a problem that it becomes an obstacle when passing through a place where the distance from an obstacle is narrow, such as when driving in a garage.

Regarding the former collision with an external obstacle, a shock-absorbing door mirror is used to reduce the impact. The shock-absorbing door mirror generally has a structure in which a mirror base fixed to a vehicle body is provided, a mirror housing is rotatably supported on the mirror base, and a mirror body is supported by the mirror housing. With such a structure, when the mirror housing collides with an obstacle, the mirror housing is tilted around the support shaft to absorb and absorb the impact.

In addition, the latter problem of being obstructed when entering the garage can be solved by passing the vicinity of the obstacle in a posture in which the mirror housing is tilted by using the above-described buffer device, It is troublesome to tilt or restore the mirror housing manually each time. For this purpose, a shock-absorbing door mirror in which a drive device having a motor and a speed reducer is mounted in a mirror housing is used.

According to the above-described transmission type shock absorbing door mirror, a shock absorbing effect is obtained when it collides with an external obstacle, and in a garage or the like, the mirror housing can be tilted and restored by a switch operation, which is convenient. .

A conventional example of a shock-absorbing door mirror will be described with reference to FIGS. 3 and 4. FIG. FIG. 3 is an exploded perspective view, and FIG. 4 is a sectional view.

The pivot 1a is detachably attached to the mirror base 1.
1b is a mounting screw. 2 is a rotation base, said pivot shaft 1a
The bearing 2a to be fitted to the is integrally formed.

A frame member 2b for mounting the mirror housing 3 is formed integrally with the rotating bracket 2.

The mirror housing 3 is brought into contact with the rear side of the frame-shaped member 2b, and is fixed with a mounting screw 3a.

The mirror remote controller drive unit 4 is mounted on the front side of the frame member 2b. 4a is a mounting screw. The mirror body 5 is attached to this drive unit via the ball joint 4b. 5a is a mirror body. The drive unit 4 is a component that operates the transmission member 4c to rotate the mirror body 5 up, down, left and right to adjust the field of view.

The gear box 6 is mounted on the rotation base 2. 6a is a mounting screw. 6b is a group of reduction gears housed in the gear box, and 6c is a gear shaft.

A drive motor 7 and a speed reducer 8 are attached to the gear box 6 to form a drive device S for a mirror housing.

FIG. 4 illustrates a cross-section developed by cutting along a plane connecting the axis of the pivot shaft 1a, the axis of the reduction gear 8, and the axis of the motor 7.

As shown in the figure, the motor 7 is fixed to the gear box 6 so that the rotating shaft 7a of the motor 7 is parallel to the pivot shaft 1a. 7b is a motor mounting screw.

The input shaft 8d and the output shaft 8e of the reduction gear 8 are connected to the motor rotation shaft.
The transmission 8 is fixed to the gear box 6 while being parallel to 7a. The original gear 6b- ₁ of the reduction gear group 6b is attached to the rotating shaft of the motor 7, and the reduction gear is transmitted to the receiving gear 6b- ₄ fixed to the reduction gear input shaft 8d via the intermediate gears 6b- ₂ and 6b- _3. I do.

The output of the speed reducer 8 is an output gear 8a fixed to an output shaft 8e.
To the receiving gear 9a of the clutch means 9 via the 8b is a nut for mounting the output gear, and 8c is the spring washer.

The receiving gear 9a is sandwiched between two clutch plates 9c- ₁ and 9c- ₂ via two friction plates 9b. 9d is a pin-shaped key for locking the rotation of the clutch plates 9c- ₁ , 9c- ₂ and the pivot shaft 1a. The pivot shaft 1a of the mirror housing also functions as a clutch shaft of the clutch means 9.

Reference numeral 9e denotes a clutch spring, which is compression-mounted between the clutch plate 9c- ₂ and the bearing 2a via a thrust bearing 9f, and slides the receiving gear 9a, the friction plate 9b, the clutch plates 9c- ₁ , and 9c- ₂ . Applying pressure to the contact surface. 9g is a snap ring that supports the force of the clutch spring 9e.

The receiving gear 9a is fixed to the mirror base 1 in a state where the clutch means 9 does not slip. Therefore, when the motor 7 tries to rotate the receiving gear 9a via the reduction gear 8 and the output gear 8a, the rotation base 2 and the mirror housing 3 on which these driving devices are mounted are rotated.

Further, when the mirror housing 3 collides with an obstacle and a large rotating power is applied to the clutch means 9, the friction surface of the clutch slips and the rotating base 2 slides. Is rotated without exhibiting excessive resistance to an external force and performs a buffer function. 11
Is a means for locking the rotating base 2 at the set position, and includes a ball 11a housed in a hole 2c provided in the rotating base 2 and a biasing spring 1
1b and a recess 11c provided on the pivot shaft.

The rotation output of the motor 7 is reduced by the reduction gear group 6b, further reduced by the reduction gear 8, and transmitted to the output gear 8a, so that a very large reduction ratio is obtained. In addition, as shown in FIG. 4, since the pivot shaft 1a of the mirror housing, the motor 7, and the speed reducer 8 are installed in parallel with each other, the overall height H of the driving device is reduced.

As described above, the mirror housing 3 is driven by the motor 7 and when the mirror housing 3 is subjected to a large external force.
Around the center. The motor 7 for driving the rotation of the mirror housing 3 is provided with a cylindrical switch member 10a fixed to the clutch plate 9c- ₂ , a lead terminal 10b sliding on the switch member 10a, and a support for the lead terminal. Angle control switch 10 (third
(See the figure).

The cylindrical switch member 10a has a conductor pattern formed around the cylindrical switch member 10a, is attached to the clutch plate 9c- ₂ , and is restrained from rotating with respect to the mirror base 1. On the other hand, the substrate 10c supporting the lead terminal 10b is fixed to the rotation base 2 and rotates together with the mirror housing 3. For this reason, the conduction state between the lead terminal 10b and the conductive pattern of the cylindrical switch member 10a is switched with the rotation of the mirror housing 3, and the motor 7 is automatically stopped when the mirror housing 3 reaches a predetermined rotation angle. Can be

As is apparent from the operation and effect described above, it is necessary that the clutch means 9 does not slip when the torque is less than the predetermined torque and slips when receiving a torque exceeding the predetermined torque.

Although the clutch means 9 of the conventional example (FIGS. 3 and 4) uses a friction clutch, an engagement type clutch similar to a jaw clutch is widely used as a conventional example different from the above.

FIG. 5 is a schematic view showing a conventional example of a groove / projection engagement type clutch.

 21 is a clutch shaft.

The clutch base plate 22 is rotatable with respect to the clutch shaft 21.
Are fitted and the relative rotation is stopped, and the clutch receiving plate 23 is fitted outside.

The clutch base plate 22 is provided with gear teeth 22a and meshes with a driving output gear 8a '.

And, a groove 22b provided in the clutch base plate 22,
The protrusions 23a provided on the clutch receiving plate 23 are engaged with each other, and are mutually pressed by the clutch spring 9e '.

Although not shown, there is another conventional example in which a ridge is provided on a clutch base plate and a groove is provided on a clutch receiving plate to engage with each other.

FIG. 6A is a plan view of the clutch receiving plate 23, and FIG. 6B is a sectional view thereof.

FIG. 7A shows a plan view of the clutch base plate 22, and FIG. 7B shows a cross-sectional view thereof.

The above-mentioned ridge 23b and the groove 22b are in contact with the slope 23
Since they have a ₋₁ and 22b ₋₁ , when they receive a large torque, they are disengaged due to slippage between slopes.

[Problems to be solved by the invention]

The ridges 23a of the clutch receiving plate 23 of the conventional example have ridge lines a, b, c, d parallel to each other as shown in FIG. 6 (A).

Also, the ridge lines e, f, and g of the grooves 22b of the clutch base plate 22 of the conventional example are configured to be parallel.

However, the ridge 23b and the groove 22b do not relatively move in parallel but rotate relatively.

FIG. 8 (A) is an explanatory view of a relative rotation state between the groove 22b and the ridge 23a.

When the ridge 23a (indicated by a dashed line) engaged with the groove 22b rotates to the 23a 'position (broken line) and further reaches 23a ", the point where the groove and the ridge intersect is a point a, Move like point b.

For this reason, the ridge of the ridge 23a is worn in such a manner as to be rubbed against the ridge of the groove 22b.

With the wear, the required torque for disengaging the engaging portion changes, and the buffering performance of the buffer type door mirror changes.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a shock-absorbing door mirror in which the edge of the ridge and the edge of the groove are rubbed against each other at the time of engagement and disengagement, and there is no risk of early wear.

[Means for solving the problem]

To achieve the above object, the present invention includes a mirror base, a mirror housing pivotally supported on the mirror base, and a driving device for rotating the mirror housing, wherein the driving device And a clutch is provided in the transmission system, and the clutch forms a groove having a slope in one of the clutch base plate and the clutch receiving plate, and the clutch base plate or the clutch receiving plate has In a shock-absorbing door mirror formed with a ridge having a slope engaging with a groove, a ridgeline where the slope of the groove intersects a surface of a clutch base plate or a clutch receiving plate, and a ridgeline where a slope of the groove intersects a bottom surface, and The ridgeline where the slope of the ridge intersects with the surface of the clutch base plate or the clutch receiving plate, and the ridgeline where the slope of the ridge intersects with the top surface are passed through the center of the clutch shaft. Thus, the radially extending straight line is matched.

[Action]

Since the ridges of the grooves and ridges provided on the clutch receiving plate and the clutch base plate are radially passing through the center of the clutch shaft, when the clutch receiving plate and the clutch base plate rotate relatively, the clutch At the same time along the entire width of the ridge and groove, and the intersection of the groove and the ridge moves while the ridge of the ridge intersects, and the ridges rub together No wear in the form of

〔Example〕

FIG. 1 shows a clutch receiving plate of a shock-absorbing door mirror according to the present invention, wherein (A) is a plan view and (B) is a cross-sectional view.

Grooves 23c of the clutch backing plate 23 'of the present example, linear Or _1, Or ₂ that each ridge extends radially through the center O of the clutch shaft,
It is consistent with Or ₃ and Or ₄ .

That is, a groove 23c is provided on the clutch axis where a part of the pyramid having the point O as the apex is made negative.

2A and 2B show a clutch base plate of the shock absorbing door mirror according to the present invention, wherein FIG. 2A is a plan view and FIG. 2B is a sectional view.

The ridges 22c of the clutch base plate 22 'in this example are straight lines O whose ridges extend radially through the center O of the clutch shaft.
r ₁ ′, Or ₂ ′, Or ₃ ′, and Or ₄ ′.

That is, the protruding ridge 22c having a shape in which a part of a pyramid having the vertex at the point O on the clutch axis is bulged is provided.

FIG. 8 (B) is an explanatory diagram of a state of relative rotation between the groove 23c and the ridge 22c in this example.

The ridge 22c (chain line) engaged with the groove 23c (solid line) is 22c '
(Dashed line), 22c ″ (dotted line)
Between the position 2c 'and the ridge line of the groove 23c, the ridge line passes instantaneously.

That is, the ridge of the ridge passes without crossing the ridge of the groove. Therefore, as shown in FIG. 8 (A), the phenomenon that the intersection of the ridge lines moves as shown by points A and B does not occur. Therefore, friction in which the edge of the ridge and the edge of the groove rub against each other may occur. There is no risk of early wear.

[Effect of the invention]

As described above, when the shock-absorbing door mirror according to the present invention is applied, there is no fear that the edge of the ridge and the edge of the groove are rubbed against each other, and the cushion function is not changed, and the service life is long and the service life is long.

[Brief description of the drawings]

1A and 1B show a clutch receiving plate in one embodiment of a shock-absorbing door mirror according to the present invention, wherein FIG. 1A is a plan view and FIG. 1B is a sectional view. FIG. 2 shows a clutch base plate in the above embodiment,
(A) is a plan view and (B) is a sectional view. 3 to 7 show a conventional shock-absorbing door mirror, FIG. 3 is an exploded perspective view, FIG. 4 is a cross-sectional view, FIG. 5 is a schematic view of a clutch part, and FIG. FIG. 7B is a plan view of the receiving plate, FIG. 7B is a sectional view of the same, FIG. 7A is a plan view of the clutch base plate, and FIG.
FIGS. 8 (A) and 8 (B) are explanatory views of the operation and effect shown by comparing the conventional example with the above embodiment. DESCRIPTION OF SYMBOLS 1 ... Mirror base, 1a ... Pivot shaft, 2 ... Rotating base, 2a ... Bearing, 2b ... Frame-shaped member, 3 ... Mirror housing, 4 ... Remote controller drive unit, 4b ...
... ball joint, 4c ... transmission member, 5 ... mirror body, 5a ...
… Mirror body, 6… Gear box, 6a …… Mounting screw, 6b …… Reduction gear group, 6c …… Gear shaft, 7 …… Motor,
8 ... reduction gear, 8a ... output gear, 8d ... input shaft, 8e ...
Output shaft 9, clutch means 9a receiving gear 9b friction plate 9c- ₁ , 9c- ₂ clutch plate 9d pin key 9e clutch spring 9f Thrust bearing, 9g Snap ring, 10 Rotation angle control switch, 10a Cylindrical switch member, 10b Lead terminal, 11 Mirror housing locking means, 11a
Ball, 11b Spring, 11e Concave, 22 Clutch base plate, 22a Teeth, 22b Groove, 22b- ₁ Slope, 22c Protrusion, 23 Clutch receiving plate, 23a … Ridge, 23a _-1 … slope, 23c… groove.

Claims (1)

(57) [Scope of request for utility model registration] A mirror housing rotatably supported by the mirror base; and a driving device for rotating the mirror housing, wherein a clutch is provided in a transmission system of the driving device. Provided, and
In the clutch, a groove having a slope is formed on one of the clutch base plate and the clutch receiving plate, and a ridge having a slope engaging with the groove is formed on the other of the clutch base plate and the clutch receiving plate. In the shock-absorbing door mirror, ridge lines r ₁ , r ₄ where the slope of the groove intersects with the surface of the clutch base plate or clutch receiving plate, and ridge lines r ₂ , r ₃ where the slope of the groove intersects with the bottom surface, and the ridge Ridge line r ₁ ′, where the slope of
r ₄ ′, and the ridge line r ₂ ′
A shock-absorbing door mirror, characterized in that r ₃ ′ coincides with a straight line radially extending through the center of the clutch shaft.