JPH11270651A - Rod advancing and retracting mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rod advancing and retracting mechanism capable of improving the operating characteristics of a mirror, and reducing the operating sound when a rod is advanced and retracted. SOLUTION: A rod advancing and retracting mechanism is provided with a rod member 10 on the outside peripheral surface of which a male screw 10A is formed, a screwing member 11 having a female screw 11B to be screwed on the male screw 10A and formed of rubber, and a gear member 12 which is formed as a worm wheel and into which the screwing member 11 is fitted. By receiving torque from a worm to rotate the worm wheel normally and reversely, the rod member 10 can be advanced and retracted vertically in Fig.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rod reciprocating mechanism, and more particularly to a rod reciprocating mechanism for reciprocating a rod for adjusting the tilt of a mirror in an electric mirror for a vehicle.

[0002]

2. Description of the Related Art In general, an electric vehicle mirror has two rods connected to the back of the mirror, and these two rods are moved back and forth in a substantially vertical direction with respect to the mirror using a motor. It is configured to tilt to a desired angle.

A mechanism for moving the rod forward and backward is disclosed in Japanese Utility Model Laid-Open Publication No. 61-186636 and Japanese Utility Model Publication No. 1-1843.
There is known a rod advance / retreat mechanism described in Japanese Unexamined Patent Application Publication No. 4 (Kokai) No. 4 and the like. For example, as shown in FIG. 3, a rod advance / retreat mechanism disclosed in Japanese Utility Model Laid-Open Publication No. 61-186636 discloses a rod 1 having a threaded portion 1A formed on an outer peripheral surface thereof and a through hole 2A through which the rod 1 is inserted. And a gear 2 having a plurality of teeth 2B formed on the outer periphery. As shown in FIG.
As shown in (1), a convex portion 2C (a through hole 2A is also provided in the convex portion 2C) is formed at the center thereof, and the torsion coil spring 3 is attached to the convex portion 2C. A small ball 1B is provided at one end of the rod 1, and the small ball 1B is
It is connected to the back of a mirror not shown.

The above-mentioned rod moving mechanism is housed in a housing of the electric mirror body. In FIG. 3, reference numeral 4 denotes a housing wall forming a part of the housing. As shown in FIG. 5, a through hole 4A is formed in the housing wall 4, and the rod 1 is inserted into the through hole 4A. A projection 4B is provided on the inner periphery of the through hole 4A, and a groove 1C is formed along the axial direction on the surface of the threaded portion 1A of the rod 1, and the rod 1 is inserted into the through hole 4A of the housing wall 4. When inserted,
The projection 4B is adapted to engage with the groove 1C.

The torsion coil spring 3 has a shape as shown in FIG. 6, and is engaged with the threaded portion 1A of the rod 1 when the rod 1 is sandwiched from both sides (see FIG. 3). For this reason, for example, when the gear 2 is rotated and the torsion coil spring 3 is rotated around the rod 1 accordingly, the projection 4B of the through hole 4A is engaged with the groove 1C of the rod 1 as described above. 1 does not rotate but moves back and forth in its axial direction.

[0006]

However, in the above prior art, the torsion coil spring only partially engages with the threaded portion on the outer peripheral surface of the rod. Has the disadvantage that it becomes worse.

When the mirror reaches a tilt limit at which the mirror cannot be further tilted, the torsion coil spring slips over the thread of the rod screw portion, and the tip of the torsion coil spring vibrates, and the sound at that time is generated. There is also the disadvantage of being harsh.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rod moving mechanism capable of improving the operating characteristics of a mirror and reducing operating noise when the rod moves.

[0009]

According to one aspect of the present invention, there is provided an elastic material having a rod member having an external thread formed on an outer peripheral surface thereof and an internal thread threadedly engaged with the external thread. And a rotational force transmitting member which rotates by receiving a rotational force from a rotary drive source and transmits the rotational force to the screw member. The forward / reverse rotation of the screw member Thus, the rod member is advanced and retracted.

According to the above construction, since the male screw of the rod and the female screw of the screw member are screwed into each other and the screw member is engaged so as to wrap around the rod, the rod can be smoothly advanced and retracted. The operating characteristics of the mirror can be improved. Further, since the screwing member is formed of an elastic material, even if the tilting limit of the mirror is reached and the screwing member slips with respect to the rod, the screwing member does not vibrate and the operation noise is reduced. No harshness.

According to a second aspect of the present invention, in the rod advancing and retreating mechanism according to the first aspect, the rotational force transmitting member is formed in an annular shape, and the screwing member is fitted inside the annular shape. The torque transmitting member and the screw member rotate integrally.

According to the above configuration, the torque transmitting member and the screwing member are integrally formed, and the size can be reduced.

[0013] The invention according to claim 3 is the invention according to claim 1 or 2.
Wherein the elastic material is rubber.

If the screw member is made of rubber as in the above configuration, the screw member can be manufactured at low cost. Further, when the screwing member is made of rubber, it can be easily fitted into the annular rotating force transmitting member. In addition,
If you make a radial cut in a part of the screw member,
The screw member can be largely deformed, and can be fitted more easily.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a rod moving mechanism according to the present invention. As shown in FIG. 1, the rod 10 has an external thread 10A formed on the outer peripheral surface thereof. A small ball 10B is provided at the upper end of the rod 10. The small ball 10B is attached to the back of a mirror (not shown).

The screwing member 11 has a flat cylindrical shape, and is entirely formed of rubber. The screwing member 11 is provided with a through hole 11A at its center along the axial direction, and a female screw 11B is formed on the inner surface of the through hole 11A. The female screw 11B is formed to be screwable with the male screw 10A of the rod 10. A plurality of recesses 11C are formed in the upper and lower peripheral edges of the screwing member 11. The concave portions 11C are arranged at equal intervals on the upper peripheral edge and the lower peripheral edge, and the arrangement positions are alternated between the upper part and the lower part.
Further, a cut 11D is formed in the screw member 11 from the outer peripheral side to the through hole 11A.

The screwing member 11 is provided inside a gear member 12 as a rotational force transmitting member. That is, the gear member 1
2 is formed in an annular shape, and the screw member 11 is fitted inside the annular shape. On the inner surface of the ring of the gear member 12, a plurality of convex portions 12A are provided toward the center of the ring. The protrusions 12A are provided on the upper and lower portions of the gear member 12, and the respective protrusions 12A are arranged at positions corresponding to the recesses 11C of the screwing member 11. Then, when the screwing member 11 is fitted inside the ring of the gear member 12, the respective protrusions 12A of the gear member 12 fit into the respective recesses 11C of the screwing member 11, and
The screw member 11 can be firmly fixed in the gear member 12.

Screw member 11 fixed in gear member 12
The rod 10 is inserted through the through hole 11A at the center of the rod, and the male screw 10A of the rod 10 is screwed into the female screw 11B on the inner surface of the through hole 11A. FIG. 2 is a sectional view showing this state.

Further, the gear member 12 has a gear 12B formed on the outer periphery thereof to constitute a worm wheel. And
It rotates by receiving a rotational force from a worm (not shown).
The gear member 12 does not move in the axial direction (axial direction of the rod 10).

According to the rod advancing / retracting mechanism having the above structure, a female screw 11B is formed on the inner surface of the through hole 11A of the screwing member 11,
Since the male screw 10A of the rod 10 is screwed to the female screw 11B, the engagement between the screw member 11 and the rod 10 is not partial engagement as in the prior art, but the screw member 11 is The engagement wraps around. As a result, when the screwing member 11 is rotated, the rod 10 smoothly advances and retreats, and the operating characteristics of the mirror can be improved.

Further, since the screwing member 11 is made of rubber, even if the screwing member 11 slips with respect to the rod 10 due to reaching the tilt limit of the mirror, the screwing member 11 causes vibration. However, it is possible to avoid a situation in which the operation noise is increased.

In this embodiment, the example in which the screwing member 11 is formed of rubber has been described. However, the screwing member 11 is not limited to rubber, and may be formed of another elastic material.

[0023]

As described above, according to the present invention,
Since the rod member and the screw member are connected by screwing the male screw and the female screw, when the screw member is rotated, the rod advances and retreats smoothly, and the operating characteristics of the mirror can be improved. Become.

Further, since the screwing member is formed of an elastic material, even if the tilting limit of the mirror is reached and the screwing member slips with respect to the rod, the screwing member does not generate vibration. The operation noise can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a rod moving mechanism according to the present invention.

FIG. 2 is a sectional view of a main part of a rod advance / retreat mechanism according to the present invention.

FIG. 3 is a cross-sectional view of a rod moving mechanism according to the related art.

FIG. 4 is a perspective view of a gear to which a torsion coil spring is attached.

FIG. 5 is a perspective view of a housing wall having a rod and a through hole through which the rod is inserted.

6A and 6B show a torsion coil spring, wherein FIG. 6A is a side view and FIG. 6B is a plan view.

[Explanation of symbols]

 Reference Signs List 10 rod 10A male screw 11 screwing member 11A through hole 11B female screw 12 gear member

Claims (3)

[Claims] 1. A rod member having an external thread formed on an outer peripheral surface thereof, a screw member formed of an elastic material having a female screw engaged with the external thread, and being rotated by receiving a rotational force from a rotational drive source. And a rotational force transmitting member for transmitting the rotational force to the screw member. 2. The rod advance / retreat mechanism according to claim 1, wherein the rotational force transmitting member is formed in an annular shape, and the screw member is fitted inside the annular member, and the rotational force transmitting member and the screw are connected to each other. A rod advance / retreat mechanism wherein the joint member rotates integrally. 3. The rod advance / retract mechanism according to claim 1, wherein the elastic material is rubber.