JPH0463738A - Electrically-driven stay housing type mirror device - Google Patents

Abstract

PURPOSE:To assure smooth and quiet operation in starting the rotation of a shaft to which a stay is fixed by devising the constitution of a transmission path, in which the power of a motor is transmitted to the stay, in a device in which the stay, to which a mirror body is fitted, is rotated with the motor via a gear row. CONSTITUTION:In a device in which a receiver gear 13 is provided on a stay 1, which is rotatably supported with a bracket case 3' fixed to a body and to which a mirror body is fitted, and the receiver gear 13 is rotatably driven with an unshown motor; a fixing ring 12 fixed to the bracket case 3 is rotatably engaged with the shaft 11 of the stay l, and also the receiving gear 13 is provided so that a relative rotation angle can be limited to the shaft 11. A tubular cam 14 is fixed to the receiver gear 13, and a movable ring 15 is slidably engaged from the outside with the tubular cam 14. A V-shaped groove-like notch 11a, having a shape in which the part of a ball 8 can be engaged, is formed on a part where the shaft 11 is faced to the tubular cam 14, and ball seats 12a and 15a are formed on each ring 12 and 14 respectively.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to, for example, an outside W! of a freight vehicle. This invention relates to an electric stay retractable mirror device used as a single-position A-touch mirror.

[Conventional technology]

FIG. 7 is a schematic external view of the electric stay retractable mirror device.

A mirror body 2 is attached to the tip of the stay 1, and the base end of the stay 1 is rotatably supported by a bracket case 3.

The above-mentioned bracket case 3 is fixed to the vehicle body 4 of the automobile.

The functions required of this type of mirror device are: a. The stay 1 can be rotated by remote control from the driver's seat, and the mirror body 2 can be projected to the side of the vehicle body or retracted.

b. Apply hand force to the mirror body 2 to remove the mirror body 2.
be able to be stored and restored out of the way.

C. When driving with the mirror body 2 protruding to the side of the vehicle body, the mirror body 2 and the stay 1 should be able to withstand wind pressure and be supported in a stable state.

In order to fulfill the above-mentioned function a''C, a conventional electric stay retractable mirror device is constructed as shown in FIG.

Reference numeral 1 shown in FIG. 8 is the stay explained with reference to FIG.

3 shown in FIG. 8 is also a bracket case.

A base end portion of the stay 1 is constituted by a shaft 1a, and is rotatably fitted into the bracket case 3.

However, the rotation angle is limited by a stopper (not shown).

A motor 5 is housed and fixed in the bracket case 3 in parallel with the shaft 1a.

A clutch 6 is attached to the output shaft of the motor 5.

6a is a clutch base plate fixed to the output shaft of the motor 5, and is opposed to and in contact with the base gear 6b, which functions as a clutch receiving plate.

Engagement unevenness 6C is provided between the clutch base plate 6a and the clutch receiving plate (base gear) 6b.

6d connects the clutch base plate 6a to the clutch receiving plate (base gear) 6.
This is the clutch spring pressing towards b.

On the other hand, a receiving gear 7 is fixed to the shaft 1a of the stay 1, and is meshed with the original gear (clutch receiving plate) 6b.

A ball 8 is rotatably fitted into a hemispherical hole provided on the lower surface of the receiving gear 7 and held therein.

9 is a spring that presses the receiving gear 7 toward the ball 8.

When the motor 5 is rotated in the conventional electric stay retractable mirror device (FIGS. 7 and 8) configured as described above, the clutch base plate 6a fixed to the output shaft of the motor 5 is rotated. is rotated.

The rotation of the clutch base plate 6a is transmitted to the base gear 6b, which is a clutch receiving plate, through the unevenness 6c, and rotates the receiving gear 7 meshed with the base gear 6b.

When the receiving gear 7 rotates, the stay 1 fixed thereto is rotated.

When the stay 1 is rotated and the mirror body 2 (Fig. 7) attached to the tip of the stay 1 is in a position suitable for functioning as a rearview mirror (hereinafter referred to as the set position), the ball 8 is It fits into the hole 3a and is held in that position.

Also, if the mirror body 2 collides with an external obstacle while driving and excessive rotational force is applied to the shaft and foot 1a of the stay 1, the engagement unevenness 6C of the clutch 6 will come off, causing the clutch base plate 6a to come off. Transmission between the clutch receiving plate (original gear) 6b is cut off.

As a result, while the clutch base plate 6a and the output shaft of the motor 5 fixed thereto remain stopped, the clutch receiving plate (base gear) 6b idles and is prevented from being damaged due to excessive rotational force.

[Problem to be solved by the invention]

In the electrically retractable mirror device of the conventional example (FIGS. 7 and 8), the motor 5 is operated to rotate the stay 1 by remote control, and the mirror body 2 can be extended and retracted.
Furthermore, the mirror body 2 can be retracted and restored by applying manual force to the mirror body 2 and turning the stay 1, and the mirror body 2 can be held in the set position by withstanding wind pressure while driving. Its function is to buffer the excessive external force in the event of a collision with an external obstacle and prevent damage, but when the stay 1 is rotated, the shaft 1a,
The receiving gear 7 rotates. Since the ball 8 rotates together with the receiving gear 7, the ball 8 rides out of the hole 3a.

In the conventional device, moderation was given to the rotation of the stay 1 by the above-mentioned riding operation, and the function of maintaining the set position of the mirror body was fulfilled. As is clear from the above operation, when the stay 1 rotates,
The ball 8 rides on the ball 8 both when it is electrically driven by the motor 5 and when it is retracted by applying manual force.

For this reason, the stay 1 and the shaft 1 fixed thereto
a is lifted when the rotation starts, making it difficult to start the operation smoothly and quietly.

Furthermore, the above-mentioned moderating force can be increased or decreased as appropriate by changing the diameter of the ball 8 or the dimensions of the hole 3a, but if you try to maintain stable holding by applying a large moderating force,
The capacity of the motor 5 must be increased.

In other words, if an attempt is made to reduce the cost by making the motor 5 smaller and lighter, the holding force of the mirror body 2 (the moderation force that locks the rotation of the stay 1) becomes smaller and the holding state becomes unstable. , it becomes difficult to withstand the wind pressure while driving.

The present invention has been made in view of the above circumstances.

When the shaft to which the stay is fixed begins to rotate.

Smoothly without rising due to the ball riding on the ground,
It can operate quietly, and even if the rotational torque of the drive motor's output shaft is relatively small, it is as quiet as a mirror body! (Rotation angle position W of stay)
An object of the present invention is to provide an electric stay retractable mirror device that can hold the mirror stably and reliably.

[Means to solve the problem]

The structure of the present invention for achieving the above object will be explained with reference to FIG. 1(A), which corresponds to an embodiment thereof.

A stay 1 is rotatably supported by a bracket case 3' fixed to the vehicle body, and a mirror body is attached to the stay 1.
and.

The receiving gear 13 fixed to the above-mentioned stay and the original gear meshed with the above-mentioned receiving gear are rotationally driven via a clutch means. Motor capable of forward and reverse drive (none shown)
and a ball means for moderating the rotation of the stay 1.

Fixedly supporting the stay 1, the bracket case 3
' and a shaft 11 that is rotatably fitted to the shaft 11.

a fixing ring 12 rotatably fitted to the shaft and fixed to the bracket case; a receiving gear 13 having a limited rotation angle relative to the shaft; A cylindrical cam 14 is fixed concentrically to the receiving gear and rotatably fitted to the shaft, and a movable cam is slidably fitted to the outside of the cylindrical cam. With ring 15.

A coil spring 16 is compressed and interposed between the receiving gear and the movable ring, and the shaft is provided at a portion facing the fixed ring, the cylindrical cam, and the movable ring, and the ball means A notch 1 in the shape of a 7-shaped groove into which a portion of the ball 8 can fit
1a, a seven-shaped groove-shaped ball seat 12a provided on the fixed ring 12 and having a shape that can fit into a part of the ball fitted in the seven-shaped groove notch, The ball receiver 15a is provided in the shape of a 7-shaped groove and has a shape capable of fitting into a portion of the ball fitted in the 7-shaped groove-shaped notch.

In addition, the cylindrical cam is a recess that can accommodate a portion of the ball that is fitted into the 7-shaped notch.

It is characterized in that it has a cam surface 14a that pushes out the ball from the upper V2V-shaped groove-shaped notch toward the outer circumferential side.

[Effect]

According to the above configuration.

When no separate rotating force is applied to the stay or the received gear, the ball 8 is inserted into the notch 11a of the shaft 11, the ball seat 12a of the fixed ring 12, the ball receiver 15a of the movable ring 15, and the cylindrical cam 14. It is located in a space surrounded by the cam surface 14a of the shaft 11, and is engaged with the notch 11a of the shaft 11 and the ball seat 12a of the fixing ring 12, so that rotation of the shaft 11 is stopped.

When the cylindrical cam 14 is rotated via the receiving gear 13, the cam surface 14a pushes the ball 8 toward the outer circumference.

The pushed out ball 8 is placed between the ball seat 12a and the ball receiver 1.
5a, and escapes from the notch 11a of the shaft 11. Therefore, the locked state of the shaft 11 is released.

The shaft 11 and the receiving gear 13 have a limited relative rotation angle (they are fitted with a relatively large play in the direction of rotation), so that the cylindrical cam 14 is connected to the receiving gear 13.
After the shaft 11 rotates together with the ball 8 and is unlocked by the ball 8, the shaft 11 starts rotating later than the receiving gear 13. Therefore, the stay 1 (which supports the mirror body (not shown)) fixed to the shaft 11 can smoothly start rotating.

It is held quietly.

〔Example〕

FIG. 1(A) is a sectional view showing essential parts of an embodiment of the electric stay retractable mirror according to the present invention.

FIGS. 1(B) and 1(C) are explanatory views of the operation of the above embodiment, and these figures will be described in detail after the structural description.

FIG. 1A depicts a state in which a mirror body (not shown) is in a set position and the rotation of the stay 1 is locked by a ball 8.

The shaft 11 is fixed to the base end of the stay 1.

On the other hand, the fixing ring 12 is fitted into and fixed to the ring attachment hole 3C of the bracket case 3'.

The fixing ring 12 rotatably supports the vicinity of the upper end of the shaft 11 via a bush 12b.

The lower end of the shaft 11 is rotatably supported by a bearing 3b integrally formed in the bracket case 3' via a bushing 3b-1.

In addition, the bracket case 3' provided with the ring mounting hole 3c and the bracket case 3 in which the bearing 3b is integrally molded are provided.
' are the same structural members, but in the cross-sectional view of FIG. 1, they are shown in a divided form, so each of them is shown with a drawing reference number 3'.

A single-piece drawing depicting the shaft 11 is shown in FIG.

The same figure (A) is a partially cutaway front view, and the same figure (B)
) is a bottom view.

A cutout 11a in the form of a 7-shaped groove into which a portion of the ball 8 can be fitted is provided near the portion of the shaft 11 that faces the fixing ring 12 described with reference to FIG. 1(A). .

In the present invention, the term "a part of the ball can be fitted" means that the ball has two dimensions that do not fit all of the ball. This is because if the entire ball is housed in the V-shaped notch 11a, the ball cannot function as a locking or moderating function.

Furthermore, the reason why the shaft 11 is formed in the shape of a figure 7 groove is that when a large rotational force is applied to the shaft 11, the ball can be pushed out by the slope of the figure 7 shape. Therefore,
The figure 7-shaped groove in the present invention only needs to have most of its slopes facing each other in a figure 7 shape, and may have a rounded bottom or entrance. That is, the V-shape includes, for example, the shape shown in FIG. 2(C).

Small diameter portion 1 of shaft 11 shown in FIGS. 2(A) and (B)
1b is a portion that fits into the bushing 3b-1 shown in FIG. 1(A).

The shaft 11 is provided with two parallel surfaces 11c and llc shown in FIGS. 2(A) and 2(B) at a portion where the receiving gear 13 shown in FIG. 1(A) is fitted. The shape of the hole that fits into the two parallel surfaces will be described later with reference to FIGS. 4 and 5.

FIG. 3 shows the fixing ring 1 described above with respect to FIG. 1(A).
2, the cross section shown in FIG. 3(A) is the same as the cross section shown in FIG. 1(A).

FIG. 1(B) is a bottom view of the fixing ring 12.

A ball seat 12a shaped like a 7-shaped groove is provided on the bottom side of the fixing ring 12, into which a portion of the ball 8 can be fitted.

12b is a hole for a screw for fixing the fixing ring 12 to the bracket case.

7-shaped groove-shaped notch 1 provided in the shaft 11
1a and the ball seat 12a in the shape of a 7-shaped groove provided on the fixing ring 12 are similar components in that they are shaped like a 7-shaped groove, but the 7 in the drawing reference number 11a
The groove shape is provided on the shaft 11, which is a rotating member, and is locked or moderated by the engagement of the ball 8, so this is called the notch 11a and the other 7 This clearly distinguishes it from the groove shape.

Further, the 7-shaped groove shown in the drawing number 12a is provided on the fixed ring 12 which is a stationary member, and a part of the ball 8 is fitted into it to keep the angular position of the shaft 11 constant regarding rotation. Therefore, this is called the ball seat 12a to clearly distinguish it from other 7-shaped grooves.

As shown in FIG. 1(A), a cylindrical cam 14 is integrally provided concentrically with the receiving gear 13, and the shaft 11 is rotatable with respect to the inner peripheral surface of the cylindrical cam. to fit.

14a is a cam surface provided near the top of the cylindrical cam 14.

A single item diagram of this integrally connected member is shown in FIG. Same figure (A)
is a plan view, (B) is a partially cut front view, (
C) is a bottom view.

14a shown in FIG. 4(A) is the aforementioned cam surface, into which a part of the ball 8 can fit. 8a indicated by a chain line indicates the ball fitted into the recess.

When the cylindrical cam 14 rotates, the ball at position 8a is pushed outward as at position 8b II (indicated by a broken line).

A compound fan-shaped hole 13a is provided in the center of the receiving gear 13, and fits into two parallel surfaces 11c of the shaft 11 (see FIG. 2). The shape of this hole 13a will now be explained with reference to FIG.

Assume a horizontal section of the shaft 11 having two parallel surfaces 11c and lie as shown by the chain line.

When this shaft 11 is rotated counterclockwise (counterclockwise) by an angle θ (in this example, the angle θ is set to 18 degrees), the position shown by the broken line is reached.

The hole shape 13a is set to fit loosely into the contours of both of the above shapes (the chain line shape and the broken line shape).

As is clear from the above description, the composite fan-shaped hole 13a is a term used for convenience and is not geometrically fan-shaped.

As shown in FIG. 1(A), a movable ring 15 is slidably fitted onto the cylindrical cam 14.

FIG. 6(A) is a three-dimensional view of the movable ring 15.

Shown in (B) and (C).

15a is a ball receiver having a seven-shaped groove.

This 7-shaped groove 15a is a 7-shaped groove with a shape and dimensions of 9 in which a part of the ball 8 can be fitted, and when the ball 8 is pushed out to the outer circumferential side as described later (for example, the When the ball 8 is pushed out from the 88 position to the 8b position in FIG. This clearly distinguishes it from the 7-shaped groove.

When the receiving gear 13 is rotated via the motor and the original gear (not shown) in the state shown in FIG. 1(A).

After the receiving gear 13 has rotated by an angle θ (θ=18 degrees in this example), the shaft 11 starts rotating.

This is because, as explained with reference to FIG. 5, the relative rotation angle of the shaft 11 and the receiving gear 13 is limited to θ=18 degrees.

When the receiving gear 13 begins to rotate, the cylindrical cam 14 connected thereto rotates, and the cam surface 14a pushes the ball 8 toward the outer circumference, resulting in the state shown in FIG. 1(B). becomes.

In this state, the ball 8 escapes from the notch 11a of the shaft 11, and the ball 8 is inserted between the ball seat 12a and the ball receiver 15a.

In this way, the ball 8 is first inserted into the notch 1 of the shaft 11.
1a to release the lock, and the cylindrical cam 14 reaches the angle θ.
After the shaft 11 has rotated by a certain amount, the shaft 11 starts to rotate.

In this way, the operation is performed in two stages, and without dispersing the force in the rotation of the shaft 11, the lock by the ball 8 is first released, and the inertia that causes the receiving gear 13 and the cylindrical cam 14 to rotate by the angle θ is released. Start rotating the shaft 11 with the help of.

Therefore, the stay 1 can be rotated without the need to particularly increase the capacity of the drive motor.

Besides, number one! In state (A), ball 8 is on shaft 1
It fits into both the notch 11a of No. 1 and the ball seat 12 of the fixing ring 12, thereby locking relative rotation thereof.

Since the fixing ring 12 is a stationary member, the shaft 11 is prevented from rotating. Therefore, even if the mirror body (not shown in this figure) attached to the tip of the stay 1 is subjected to wind pressure, it is reliably held at the set position.

In the state shown in Fig. 1 (A), when you apply rotational force to the stay 1 by applying hand force to the mirror body (not shown in this figure) attached to the stay 1, the shaft fixed to the stay 1 11 receives rotational force.

Since a portion of the ball 8 is fitted into the V-shaped notch 11a of the shaft 11, the rotational force causes the ball 8 to resist the biasing force of the coil spring 16 and move to the position shown in FIG. 1(C). As shown, it is pushed between the ball seat 12a of the fixed ring 12 and the ball receiver 15a of the movable ring 15.

After the shaft 11 is rotated by an angle θ (18 degrees in this example) as described above, the receiving gear 13 begins to be rotated. The reason why the phase difference of 18 degrees is generated is that the relative rotation angle between the shaft 11 and the receiving gear 13 is limited to the angle θ=18 degrees, as explained with reference to FIG. This is because the shaft 11 can freely rotate relative to the receiving gear 13 within this range.

When rotational force is applied to the receiving gear 13, the original gear 6b meshing with it receives the rotational force, and the clutch spring 6d
is compressed, the engagement unevenness 6c is disengaged, and the clutch base plate 6
It idles against a.

As a result, in the case where the stay 1 can be rotated without rotating the motor 5, since the motor 5 is equipped with the reducer 5a, it cannot be easily rotated even if force is applied from outside. Since the clutch device is disengaged (the engagement unevenness 6c is disengaged), the stay 1 can be rotated manually.

Furthermore, as is clear from the operation described above, the shaft 1
There is a time lag between the operation of pushing out the ball 8 through the 7-shaped groove-shaped notch 11a and the operation of disengaging the engaging projections and recesses 6C of the clutch device. In other words, the escape resistance of the ball 8 and the separation resistance of the engagement unevenness 6c do not overlap at the same time. Therefore, the stay 1 can be rotated with a manual operating force that is smaller than the moderation force applied to the stay 1's rotation.

Even in the above manual operation, the ball 8 is moved to the ball seat 12a.
Since the shaft 11 escapes between the ball receiver 15a and the ball receiver 15a, the phenomenon that the shaft 11 rides on the ball 8 does not occur.

〔Effect of the invention〕

As explained above, according to the electric stay storage mirror device of the present invention, when the shaft to which the stay is fixed starts rotating, the shaft does not rise due to the ball riding on it,
It can operate smoothly and quietly, and even if the rotational torque of the output shaft of the drive motor is relatively small, the mirror body position W (stay rotation angle position W) can be maintained.
It has an excellent practical effect of being able to stably and reliably hold.

[Brief explanation of drawings]

FIG. 1(A) shows an embodiment of the electric stay retractable mirror device according to the present invention, and is a longitudinal sectional view of the main part. FIG. 1(B) and FIG. 1(C) show the operation of the above embodiment;
It is an explanatory diagram of an effect. FIG. 2 shows the shaft in the above embodiment, and the same figure (A
) is a partially cutaway front view, (B) is a bottom view, and (C) is an explanatory diagram of the 7-shaped groove. FIG. 3 is a two-sided view showing the fixing ring in the embodiment. FIG. 4 is a 3-sided view showing the integrally connected member of the receiving gear and the cylindrical cam in the embodiment. FIG. 5 is an explanatory diagram of a compound fan-shaped hole provided in the receiving gear. FIG. 6 is a three-sided view showing the movable ring in the embodiment. FIG. 7 is a schematic external view of the electric stay retractable mirror device. FIG. 8 is a sectional view showing a conventional example of an electric stay retractable mirror device. 1... Stay, 2... Mirror body, 3... Bracket case, 4... Vehicle body, 5... Motor, 6...
・Clutch, 6a... Clutch base plate, 6b... Original gear functioning as clutch receiving plate, 6c... Engagement unevenness, 6d... Clutch spring, 7... Receiving gear, 8
...Ball, 9...Spring, 11...Shaft, lla...V-groove notch, llb...
Small diameter part, llc...two parallel surfaces, 12...fixing ring, 12a...ball seat, 12b...hole for mounting screw,
13... Receiving gear, 13a... Composite fan-shaped hole, 14...
- Cylindrical cam, 14a... cam surface, 15... movable ring, 15a... ball receiver, 16... coil spring. Figure 1 (A)

Claims (1)

[Claims] 1. A stay that is rotatably supported by a bracket case fixed to the vehicle body and has a mirror body attached thereto, a receiving gear fixed to the stay, and a receiving gear meshed with the receiving gear. In the electric stay storage mirror device, the stay is fixed, the stay is fixed, and the stay is fixed. a shaft supported by the shaft and rotatably fitted to the bracket case; a fixing ring rotatably fitted to the shaft and fixed to the bracket case; a received gear whose rotation angle relative to the shaft is limited; a cylindrical cam fixed concentrically to the received gear and rotatably fitted to the shaft; , a movable ring that is slidably fitted onto the outside of the cylindrical cam; a coil spring that is compressed and interposed between the received gear and the movable ring; and the shaft is a fixed ring; a V-groove notch provided in a portion facing the cylindrical cam and the movable ring and having a shape into which a portion of the ball of the ball means can be fitted; a V-shaped groove-shaped ball seat having a shape capable of fitting into a portion of the ball fitted in the groove-shaped notch; and a ball seat provided on the movable ring and fitted in the V-shaped groove-shaped notch. a ball receiver having a V-shaped groove that can fit into a portion of the ball; An electric stay retractable mirror device, characterized in that it has a recessed portion capable of being accommodated, and a cam surface that pushes out the ball from the V-shaped notch toward the outer periphery.