JPH011642A - Electrically foldable door mirror - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] A1 Object of the Invention (+) Industrial Application Field The present invention relates to a mirror that is rotatably supported by a support shaft that is erected on a base that is fixed to a door side. An electric motor is built in the body, and a first gear supported on a support shaft and a second gear interlocked and connected to the electric motor and supported on the mirror body are meshed with each other. The present invention relates to an electrically foldable door mirror in which a click mechanism is interposed between the gears and is biased in a direction to exert an engagement force by an engagement spring that biases the first gear in one axial direction.

(2) Prior Art Conventionally, such door mirrors have been manufactured, for example, in Japanese Patent Application Laid-open No.
It is publicly known from Publication No. 3154 and the like.

(3) Problems to be Solved by the Invention However, in the conventional device described above, a reduction gear train is interposed between the electric motor and the second gear to reduce the driving force of the electric motor and transfer it to the second gear. Since a large number of gears are used, backlash of the gears causes backlash, causing the mirror body to swing.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an electrically foldable door mirror that absorbs gear backlash and prevents the mirror body from swinging.

B3 Structure of the Invention (1) Means for Solving the Problems According to the present invention, the support shaft has a first gear that meshes with the second gear, and also works with the first gear to engage the second gear. A third gear sandwiching the teeth is supported, and the third gear is disposed between the first gear and the engagement spring.

(2) Effect According to the above configuration, the third gear is urged in a direction approaching the first gear by the engagement spring, and in this state, the third gear
Since the gears sandwich the second gear, the backlash of the second gear, that is, the mirror body, relative to the support shaft is eliminated, and the backlash of the mirror body is eliminated.

Moreover, since the engagement spring also has the function of biasing the click mechanism, it is possible to avoid an increase in the number of parts and space due to the addition of a new function.

(3) Examples Hereinafter, examples of the present invention will be explained with reference to the drawings.
First, in FIG. 1 showing an embodiment of the present invention, a base 2 of a door mirror 1 is attached to the front end of a front side door 3 of a vehicle, and is integral with this base 2 and is attached to the outside of the vehicle. A mirror body 5 is rotatably supported by a support shaft 4 erected on an arm portion 2a extending in the direction. A mirror 6 is attached to the mirror body 5 so as to face the rear side of the vehicle. An electric drive means 7 is built in a portion of the mirror body 5 near the base 1, and the operation of the electric drive means 7 allows the mirror body 5 to rotate around the support shaft 4.

Referring also to FIG. 2, the electric drive means 7 includes a first gear 8 connected to the support shaft 4, a second gear 11 connected to the electric motor 10 via a reduction gear train 9, and a second gear 11 connected to the electric motor 10 via a reduction gear train 9. The third gear is supported on the support shaft 4 so as to mesh with the second gear 11 together with the first gear 8.
A gear 12 is provided.

Furthermore, the reduction gear train 9 and the electric motor 10 are housed in a housing 13, and the housing 13 is fixed to a support member 14 that is integral with the mirror body 5. The support member 14 is fixed to the lower part of the mirror body 5 facing the upper surface of the arm portion 2a of the base 2, and the support shaft 4 is inserted into a through hole 15 formed in the support member 14. In order to mesh with the first and third gears 8.12 located at the top,
A second gear 11 is rotatably mounted at the bottom of the housing 13.
67 supported.

A disk-shaped support plate 16 is fixed to the upper end of the support shaft 4, and a first gear 8 faces the support plate 16 from below.
The support shaft 4 is inserted through a third gear 12 that faces the first gear 8 from below. Moreover, 1st and 3rd gear 8.12
are set to have the same outer diameter and the same number of teeth. Further, a coil-shaped engagement spring 17 surrounding the support shaft 4 is connected to the support member 14.
and a washer 18 that abuts the lower surface of the third gear 13, and the spring force of the engagement spring 17 causes the third gear 12 and the first gear 8 to move toward one side in the axial direction, that is, the support plate 1.
It is spring-biased in the direction approaching 6.

A click mechanism 19 is interposed between the support member 14 and the arm portion 2a of the base 2. This click mechanism 19 has a disk-shaped receiver that surrounds the support shaft 4 and is fixed to the upper surface of the arm portion 2a, and is arranged at a plurality of positions spaced apart in the circumferential direction on the mutually opposing surfaces of the plate 20 and the support member 14. It consists of hemispherical recesses 21 and 22, respectively, and a click ball 23 fitted into the four parts 21 and 22. Moreover, the engagement spring 17
As the support member 14 is urged toward the plate 20 side by the elastic force of It is biased in the direction of exerting the engagement force. Further, a click mechanism 24 is interposed between the support plate 16 and the first gear 8, and this click mechanism 24 is connected to the first gear 8.
and hemispherical recesses 25 and 26 provided on the opposing surface of the support plate 16 at a plurality of positions spaced apart in the circumferential direction.
and a click ball 27 fitted into the recesses 25 and 26. Further, the first gear 8 is connected to the engagement spring 1
The click ball 27 is pushed into the recesses 25 and 26 by the elastic force of 7.
The click mechanism 24 is biased in a direction that maintains the state of being fitted therebetween, that is, a direction in which the click mechanism 24 exerts an engagement force. Moreover, the engagement force of the click mechanism 24 is set to be larger than the engagement force of the click mechanism 19.

In this way, the first gear 8 is substantially fixed to the support shaft 4 unless a force that releases the locking of the click mechanism 24 acts on the second gear 11, that is, the mirror body 5.

Referring also to FIG. 3, the first and third gears 8.12
Interposed between them is a locking mechanism 31 in which a sphere 30 is fitted into a plurality of hemispherical recesses 2B and 29 respectively formed in the opposing surfaces. The resilient force of the spring 17 urges the third gear 12 in a direction to maintain the state in which the sphere 30 is fitted between the recesses 2B and 29. Moreover, the engagement force of this engagement mechanism 31 is set smaller than the engagement force of the click mechanism 24.

Further, in the locking mechanism 31, when the sphere 30 is fitted between the recesses 28 and 29, the third gear 12 cooperates with the first gear 8 to shift the second gear as shown in FIG. The position of the third gear 12 is set so as to sandwich the 11 teeth 11a from both sides.

A harness 32 connected to the electric motor IO in the housing 13 is drawn into the arm 2a of the base 2 from the door 3 side, and is further introduced into the housing 13 through an insertion hole 33 provided coaxially with the support shaft 4. be done.

Next, the operation of this embodiment will be explained. When the mirror body 5 is in the normal position, the electric motor 10 is in an inactive state, and the locking mechanism 31 moves the sphere 30 as shown in FIG. 3(a).
), it is in a state of being fitted into the recesses 28° and 29.

In this state, since the teeth 11a of the second gear 11 are sandwiched between the first and third gears 8.degree. 12, the second gear 11 is prevented from rotating. Therefore, the second gear l
1, the mirror body 5 is prevented from wobbling.

When tilting the mirror body 5 backward from the normal position, the electric motor 1O is energized to rotationally drive the second gear 11. As a result, the second gear 11 rotates about its rotation axis in the direction indicated by the arrow 35 in FIG. 4. At this time, the third gear 12 is driven by the second gear 8 in the direction shown by the arrow 37, and while contracting the engagement spring 17, the sphere 30 is moved from the recess 29 to the third gear as shown in FIG. 3(b). The third gear 12 is angularly displaced so as to ride on the upper surface of the third gear 12, and the angular displacement of the third gear 12 stops when the third gear 12 is in the same phase as the first gear 8.

From the time when they are in the same phase, the first and third gears 8 and 12 are both fixed to the support shaft 4, and the second gear 11 is engaged with both gears 8 and 12 while rotating the support shaft 4. The mirror body 5 revolves around the mirror body 5 in the direction indicated by an arrow 36, thereby rotating the mirror body 5 from the normal position to the tilted position.

After the electric motor IO stops operating, the third gear 12
The pushing force from the second gear 8 is not applied to the third gear.
The gear 12 returns to its original position by the spring force of the spring 17,
The teeth 11a of the second gear 11 are connected to the first and third gears 8, 12.
I'm caught in the middle. Moreover, at this time, the second gear 11 is replaced by the third gear 1.
2, it is pressed in the direction opposite to the arrow 35, and by absorbing the angular displacement due to backlash in the reduction gear train 9, it rotates slightly in the direction opposite to the arrow 35. Therefore, even in this fallen state, the teeth 11a of the first gear 11 are sandwiched between the first and third gears 8 and 12, and the mirror body 5 does not shake.

When the mirror body 5 is forcibly tilted down from its normal position by manual operation, the mirror body 5 can be forcibly pushed in the revolution direction 36, and the click mechanism 19 and the engagement mechanism 31 are first disengaged, and then the click mechanism 24 is disengaged. It comes off and 2nd gear 1
1 revolves around the support shaft 4, and the mirror body 5 can be tilted down.

Further, when an external shock is applied to the mirror body 5, the click mechanisms 19, 24 and the engagement mechanism 31 are disengaged, causing the mirror body 5 to fall.

FIG. 5 shows another embodiment of the present invention, in which a third gear 12', which has fewer teeth than the first gear 8, is attached to the support shaft 4 below the first gear 8. supported and placed;
The first and third gears 12' mesh with the second gear 11.

Moreover, the engagement mechanism 31 is not interposed between the first and third gears 8 and 12', and the third gear 12' is connected to the first gear 8 by the engagement spring 17 (see FIG. 2). It is biased in the direction of sliding contact. In this state, the teeth 11a of the second gear 11 are sandwiched between the first and third gears 8.12'.

In this way, the first gear 8 is connected to the click mechanism 19.
Since it is fixed to the support shaft 4 via 1 gear 8
The stopped state when the second gear 11 is received by the first gear 8 and the rotating state until the second gear 11 is received by the first gear 8 are repeated.

Even in this case, in the stopped state, the second gear 11 is sandwiched between the first and third gears 12', and this sandwiched state is maintained by the friction between the first and third gears 8 and 12'. Therefore, rattling of the mirror body 5 is prevented in the same manner as in the previous embodiment.

C1 Effects of the Invention As described above, according to the present invention, the support shaft supports the third gear that meshes with the second gear together with the first gear and works in cooperation with the first gear to sandwich the teeth of the second gear. and the 3rd gear is the 1st gear
Since it is placed between the gear and the engagement spring, it can absorb the rattling of the second gear with respect to the support shaft and reliably prevent rattling of the mirror body. Since it also has the function of urging, it is possible to avoid an increase in the number of parts and space due to the addition of new functions.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a partially cutaway front view of a door mirror, FIG. 2 is an enlarged longitudinal sectional front view of the main part of FIG. 1, and FIG. are the first and third
An enlarged vertical sectional view of the locking mechanism between gears, Figure 4 shows the first and second gears.
FIG. 5 is a plan view corresponding to FIG. 4 of another embodiment of the present invention.

Claims (1)

[Claims] A support shaft is installed upright on a base fixed to the door side, and an electric motor is built into the mirror body which is rotatably supported by the support shaft.The first gear supported by the support shaft and the electric motor A second gear, which is interlocked and connected to the mirror body and supported by the mirror body, meshes with each other, and an engagement force is applied between the support shaft and the first gear by an engagement spring that biases the first gear in one direction in the axial direction. In an electric folding door mirror in which a click mechanism is provided which is biased in the direction of activation, the spindle has a first gear that meshes with the second gear, and works together with the first gear to rotate the second gear. An electrically foldable door mirror characterized in that a third gear sandwiching teeth is supported, and the third gear is disposed between the first gear and an engagement spring.