JP2526855Y2 - Door mirror mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a mounting structure of a vehicle door mirror.

2. Description of the Related Art A door mirror of an automobile is mounted so as to protrude laterally from a vehicle body as compared with a fender mirror, so that, for example, when entering a garage, a mirror housing protruding to the side hinders the garage. There is a danger that the vehicle cannot be put in, or that a person or a car collides with the mirror housing while parked or stopped and damages people or objects. Therefore, a retractable door mirror has been proposed in which the mirror housing can be completely tilted from a neutral position at the time of use and held in a tilted position as required. Generally, such a retractable door mirror has a mirror housing which is rotatably and cantilevered with respect to a shaft which stands upright on a mounting base which is mounted on a door, and between the mounting base and the mirror housing. And a positioning mechanism for holding the mirror housing in a neutral position in a normal posture and a tilted position in a retracted state.

By the way, an example of a structure of a conventionally known door mirror rotating unit is shown in FIGS. The figure shows the structure of a rotating part used in a conventional electric folding door mirror. In the drawing, reference numeral 1 denotes a mounting base fixed to the vehicle body,
1a is a rotation support surface of the mirror housing 2 provided on the upper surface of the base, 3 is a shuff erected on the support surface, 4 is a supporting frame to which the mirror housing is fixed, 5
Is a spring holding cylinder formed at the end of the frame, and this holding cylinder is inserted into the shaft 3 so as to be vertically movable. Reference numeral 6 denotes a clutch gear rotatably mounted on the upper part of the shaft. This gear meshes with a gear 15 that is interlocked with the output shaft of an electric means such as a DC motor with a reduction gear supported on a supporting frame in the mirror housing. Reference numeral 7 denotes a clutch plate fixed to the upper end of the shaft 3, and a first clutch mechanism is interposed between the clutch plate 7 and the clutch gear 6. This clutch mechanism includes a clutch plate 7 and a clutch gear 6.
A plurality of balls 8 are arranged concentrically around the shaft 3 and a positioning recess 9 is provided on a surface facing the ball, and the ball is fitted into the recess. . A set spring 10 for pressing the clutch gear 6 and the ball 8 toward the clutch plate 7 is mounted around the spring holding cylinder 5.

The supporting frame 4 and the mirror housing 2
A second clutch mechanism to be described later is interposed between the rotation supporting surface 1a and the set spring 10, and the set spring 10 presses the supporting frame 4 against the base 1 and presses it. That is, a positioning mechanism (ball clutch) for holding the mirror housing 2 at the neutral position or the inclined position is provided between the mounting base 1 and the supporting frame 4. In this positioning ball clutch, several balls 11 are concentrically arranged about the shaft 3 between the rotation support surface 1a of the mirror housing and the frame 4, and the balls are fitted. A positioning recess 12 is formed on the frame 4 side, and a recess 13 is provided on the base 1 side for accommodating the ball 11 and a ball spring 14 for moving the ball 11 up and down.
Is formed.

[Problems to be Solved by the Invention] Since the conventional door mirror rotating section has the above-described configuration, the mirror housing moves up and down on the base during rotation, and there is a disadvantage that play is likely to occur. It is thought that there are mainly three causes when devising the cause.

The ball clutch for positioning of the mirror housing moves the ball 11 up and down by a spring 14 to provide a click feeling of riding over the ball when the housing is turned.
Moves up and down, which is likely to cause play.

The force with which the supporting frame 4 is pressed against the upper surface of the base 1 is the difference in spring load between the upper spring 10 and the lower spring 14. However, since the elastic modulus of the spring varies, the spring load for pressing the frame 4 against the base 1 also varies, so that the frame 4 tends to rattle.

Since concave portions into which the balls 8 or 11 fit are provided in the base 1, the supporting frame 4, the clutch gear 6, and the clutch plate 7, respectively, it is difficult to obtain positional accuracy.

An object of the present invention is to improve the above-mentioned problems and also to solve the following problems which have been conventionally demanded. That is, the conventional device requires a large number of small components such as the ball spring 14 to be assembled, and the assembly is troublesome, and it is difficult to improve the assembly. In addition, a set space H is required in the thrust direction of the shaft to provide the spring 10 between the supporting frame 4 and the clutch gear 6. Further, in the electric folding mirror, a space is required for the clutch gear 6 to move up and down. As described above, a large assembling space was required in the thrust direction of the shaft.
There was a request to reduce this.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a support frame rotatably supported by a shaft erected on a mounting base, and a mirror housing fixed to the frame is moved to a neutral position and an inclined position. In a door mirror which can be rotated and held, a support surface of a mirror housing formed on an upper surface of the base and a rotating surface formed on a lower surface of the frame are brought into direct contact with each other, and are then brought into contact with the shaft. The cylindrical member is mounted on the base side so as to be elastically pressed, and at least a lower end surface of the cylindrical member is provided with a groove in a circular shape centering on the shaft, and the groove is made of an elastic material, and is formed of an elastic material. A thin plate-shaped circular ring body having a concave portion is flexibly arranged, and a plurality of balls are sandwiched between the ring body and the upper surface of the frame. The ball is pressed to the base side by the ring body, and a positioning recess for fitting the ball is provided on a surface facing the ring body and the frame.

[Embodiment] Hereinafter, an embodiment in which the present invention is applied to a rotating shaft of a housing in an electric retractable mirror will be described with reference to the drawings.

FIG. 3 is an enlarged sectional view of a main part of a shaft portion, and FIG. 4 is an exploded perspective view of a cylindrical member and a clutch plate portion excluding the shaft.

In FIG. 3, reference numeral 21 denotes a mounting base fixed to a vehicle body, 22 denotes a mirror housing support surface formed on the base upper surface, 23 denotes a shaft erected on the support surface, and 24 denotes a supporting member for fixing the mirror housing. Frame, 25
Is a bearing cylinder formed at the end of the supporting frame.

As shown in FIG. 3, the support surface 22 of the mirror housing formed on the upper surface of the base 21 by inserting the bearing cylinder 25 into the shaft 23 and the rotating surface 26 formed on the lower surface of the frame 25 are directly faced. Make contact. Further, a cylindrical member 27 is inserted outside the bearing sleeve 25 inserted into the shaft 23. The cylindrical member of the illustrated embodiment has a gear 27a formed on the peripheral surface thereof, and is rotatably inserted into the bearing cylinder 25. The gear 27a meshes with a gear (not shown) fixed to the output shaft of an electric means such as a DC motor with a speed reducer mounted on a supporting frame in the mirror housing via a rotary gear 15.

As shown in FIG. 3, the cylindrical member has grooves formed on the lower end surface and the upper end surface of the boss portion 27b in a circular shape around the shaft 23.
28 and 29 are provided respectively. These circular grooves 28,
Steps 28a and 29a are respectively formed in 29, and thin circular rings 30a and 30b made of an elastic material formed on the step and corresponding to the grooves as shown in FIG. It is arranged in a suspended state that slightly rises from above, and is fixed so as not to rotate using a set screw or the like. Then, a plurality of holding recesses 31 or 32 for holding a ball member are formed at equal intervals in the ring body, and steel balls 34 and 35 which are elements of a clutch are fitted into these recesses as described later, respectively. A part of the spherical surface is urged by the elasticity of the ring bodies 30a and 30b so as to protrude upward or downward from the end face of the boss.

A clutch plate 36 is fixed to the upper end of the shaft 23 via a fixing member 37, and several positioning recesses 38 into which the balls 34 can be fitted are formed on the lower surface of the clutch plate 36. A positioning recess 39 into which the ball 35 fits is formed on the end surface of the supporting frame 24 facing the cylindrical member 27. Then, the cylindrical member 26 and the supporting frame 24 are assembled so as to be pressed against the mounting base 21 side by the clutch plate 36, whereby several balls disposed between the clutch plate 36, the cylindrical member 26, and the opposing surfaces of the two. 34 constitutes a first clutch mechanism. Further, the cylindrical member 26, the supporting frame 24, and a plurality of balls 35 disposed between the opposing surfaces thereof.
This constitutes a second clutch mechanism.

It should be noted that the second clutch mechanism is to make the ball member shallower to the recess 39 than the first clutch mechanism above, or to make the ball ball diameter larger than the upper latch when the bite is the same. This weakens the engagement of the clutch.

Next, the operation and effect of the present invention configured as described above will be described.

FIG. 3 shows a state in which the mirror housing is stationary at a neutral position, that is, a normal position. In this state, the upper and lower clutches are properly engaged by the elasticity of the thin ring members 30a and 30b made of an elastic material. When turning the mirror housing to the tilted position from this state,
For example, when the electric means is driven by operating a switch in the vehicle compartment, the rotational force is transmitted to the cylindrical member 27 via the output gear 15 and the gear 27a. Since the cylindrical member is strongly engaged with and fixed to the clutch plate 36 via the first clutch mechanism, the cylindrical member does not rotate, and the gear 15 meshes with the gear of the cylindrical member 27 and revolves in the same direction while rotating. . By this rotation, the supporting frame integrated with the electric means
24 rotates, the second clutch mechanism with weak engagement between the cylindrical member 26 and the supporting frame 24 is disengaged, and the mirror housing rotates about the shaft 23. If the rotation of the electric means is stopped at an arbitrary tilting position, the clutch plate 36 and the cylindrical member 27 are tilted and held at that position while being engaged.

When returning from the tilted position to the neutral position, the electric means is reversed, the gear 15 revolving around the cylindrical member 27 is rotated in the opposite direction to the front, and the supporting frame 24 is rotated, so that the supporting frame 24 is rotated. Cylindrical member facing
The ball 35 is fitted into the concave portion 39 formed on the end face of the connector 26 and is positioned and held.

When the mirror housing is manually tilted, the gear 15 meshing with the gear on the peripheral surface of the cylindrical member 27
It is forcibly turned around 23, while the ring body 30
First, the lower second clutch having weak engagement is disengaged against the elasticity of a, 30b, and then the clutch plate 36 and the cylindrical member are disengaged.
Since the first clutch between the mirror housing 26 and the mirror housing 26 is disengaged, the mirror housing can be tilted around the shaft 23 to an arbitrary tilt position. When a shock is applied to the mirror housing, an external force larger than the disengagement torque of the upper clutch (first clutch) is momentarily received, so that the upper and lower clutches are disengaged almost simultaneously, and the mirror housing is forcibly rotated.

By the way, the above-described embodiment shows the rotating shaft of the electric retractable mirror in which the mirror housing can be completely tilted from the neutral position at the time of use and held in the tilted position by electric means such as a DC motor with a speed reducer. A gear 27a is formed on the surface and rotatably inserted into the bearing cylinder 25, but when applied to a mere turnover type door mirror having no electric means, a cylindrical member as shown in FIG.
There is no need to form gears on 27. The cylindrical member can be attached to the shaft so as not to rotate, but is attached so as to be movable in the thrust direction of the shaft.

[Effects of the Invention] According to the configuration of the present invention described above, the following functions and effects are exhibited.

Supporting frame when the mirror housing rotates
24 does not move up and down, so the mirror housing does not rattle.

Conventionally, it is necessary to assemble parts such as a ball spring and a set spring, but the assembling work is troublesome. However, the present invention not only does not require the ball spring, but also does not require providing a set spring between the frame and the clutch gear.

The present invention consists of an elastic material in a groove provided in a cylindrical member,
Since only a thin plate-shaped circular ring having a ball holding concave portion and a steel ball are provided, the workability of assembling is significantly improved as compared with the conventional type.

Because there is no set spring unlike the conventional type,
There is no need for a space for a set spring with a large height in the thrust direction of the shaft. Therefore, the assembling space can be reduced, and the size of the mirror housing can be reduced.

And so on.

[Brief description of the drawings]

1 is an exploded perspective view showing an example of the structure of a conventional door mirror rotating unit, FIG. 2 is an assembled vertical sectional view of the same, FIG. 3 is an enlarged sectional view of a main part of a shaft unit in the present invention, and FIG. FIG. 5 is an exploded perspective view of a cylindrical member and a clutch plate portion excluding FIG. 5, and FIG. 5 is a sectional view of a shaft portion showing another embodiment of the present invention. 21: Mounting base, 22: Mirror housing support surface, 23:
Shaft, 24: supporting frame, 25: bushing, 2
6: rotating surface, 27: cylindrical member, 27a: gear, 27b: boss, 28, 2
9: groove, 30a, 30b: ring body, 31, 32, 38, 39: positioning recess, 34, 35: ball, 36: clutch plate, 37: fixing member, 38, 39: recess

Claims (1)

(57) [Scope of request for utility model registration] In a door mirror, a supporting frame is rotatably supported by a shaft erected on a mounting base, and a mirror housing fixed to the frame can be rotated and held at a neutral position and an inclined position. The supporting surface of the mirror housing formed on the upper surface and the rotating surface formed on the lower surface of the frame are brought into direct contact with each other, and then mounted on the shaft so as to elastically press the cylindrical member toward the base, A circular groove centering on the shaft is provided on at least the lower end surface of the cylindrical member, and a thin circular plate made of an elastic material and having a concave portion for holding a ball is flexibly deformable in the groove. Place,
Further, a plurality of balls are sandwiched and arranged between the ring body and the upper surface of the frame, the balls are pressed toward the base by the ring body, and the balls are fitted into the opposing surfaces of the ring body and the frame. A mounting structure for a door mirror, characterized by having a concave portion for use.