JP2003297115A - Reciprocating drive mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To precisely control the operation stop position of a movable body, with no new installation space nor increase in the number of components. <P>SOLUTION: There are provided a movable body (movable reflector) 3 which is reciprocated by a drive part 2, and an insulated electric wire 4 connected to the movable body 3. The insulated electric wire 4 is fitted by fixing its intermediate part to a base plate 5. Such insulated part as close to the movable body 3 including at least a fixing part (clip 9) constitutes an elastic energizing part 10 which offsets the movable body 3 formed from elastic insulating resin within the range of mechanical play when the insulated electric wire 4 is driven by a repulsive force (f). The movable body 3 is driven by an elastic energizing part 10 with no looseness. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating drive mechanism applied to a movable reflector of a light distribution control mechanism mounted on a vehicle and illuminating a turning direction of the vehicle.

[0002]

2. Description of the Related Art A light distribution control mechanism mounted on a vehicle for illuminating the turning direction of the vehicle is for improving the visibility in a wider area in the front or in the side when the vehicle travels in a curve or at an intersection. The steering angle is detected, and the movable reflector is reciprocally rotated by a drive unit including a power source such as a motor and a speed reduction mechanism.

At this time, a light source bulb is attached to the movable reflector, and a covered electric wire is connected to supply electric power to the light source bulb. This coated wire is made of a resin material that satisfies the heat resistance and is relatively soft (for example, crosslinked vinyl, crosslinked polyethylene) from the idea that the repulsive force causes an increase in operating load when the movable reflector is driven. It is used to reduce the repulsive force.

[0004]

However, in the conventional light distribution control mechanism, the operation stop position of the movable reflector varies within the range of mechanical play during driving, and high-precision position control cannot be performed. have.

For this reason, it is possible to add a backlash correction mechanism, but in that case, a new problem of securing an installation space and increasing the number of parts is derived and cannot be a fundamental solution.

Therefore, the present invention provides a reciprocating drive mechanism that does not require a new installation space, does not increase the number of parts, and is capable of highly accurate position control of the operation stop position of the movable body. It is intended to be provided.

[0007]

In order to achieve the above object, the invention of claim 1 comprises a movable body which is reciprocally driven by a drive unit, and a covered electric wire which is connected to the movable body. In the reciprocating drive mechanism, the covered electric wire is fixedly attached to the fixing member at its intermediate portion, and at least the covering portion of the portion closer to the movable body including the fixed portion is made of an elastic insulating resin material. It is characterized in that it constitutes an elastic urging portion which is formed and biases the movable body within the range of mechanical play at the time of driving by the repulsive force of the covered electric wire.

Therefore, in the invention of claim 1, the movable body is
The covered portion of the covered electric wire is driven by an elastic urging portion formed by an elastic insulating resin material without being biased within the range of mechanical play.

Further, the invention of claim 2 is the reciprocating drive mechanism according to claim 1, wherein the movable body is a movable reflector of a light distribution control mechanism which is mounted on a vehicle and illuminates a turning direction of the vehicle. It is characterized by

Therefore, in the invention of claim 2, the movable reflector is biased within the range of mechanical play by the elastic biasing portion formed by forming the covering portion of the covered electric wire with the elastic insulating resin material. Drive in a state without play.

Further, the invention of claim 3 is the reciprocating drive mechanism according to claim 1 or 2, wherein the elastic insulating resin material is ethylene tetrafluoride ethylene.

Therefore, in the invention of claim 3, the ethylene tetrafluoride ethylene becomes soft or hard with respect to the temperature change even if the ambient temperature changes within the range of -40 ° C to 120 ° C. Since the high elasticity can be maintained without changing the elasticity, it is possible to configure the elastically urging portion in which the width of the change in the elastic force with respect to the temperature change is small.

Further, since ethylene tetrafluoride ethylene has a good lubricity, the coating portion is not abraded even when the electric wires are rubbed with each other or the electric wires and other members are rubbed when the movable body is repeatedly driven. It never happens.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a reciprocating drive mechanism according to an embodiment of the present invention, showing a light distribution control mechanism 1 mounted on a vehicle for illuminating a turning direction of the vehicle.

The light distribution control mechanism 1 is generally constituted by a movable reflector 3 as a movable body which is reciprocally driven by a drive unit 2 and a covered electric wire 4 connected to the movable reflector 3.

At this time, the covered electric wire 4 is fixedly attached to the base plate 5 serving as a fixing member, and at least the covering portion of the portion near the movable reflector 3 including the fixed portion is elastic. An elastic urging portion 10 is formed of an insulating resin material that biases the movable reflector 3 by the repulsive force of the covered electric wire 4 within a range of mechanical play during driving.

Specifically, the lower portion of the movable reflector 3 is connected to the output shaft 6 of the drive unit 2, and a valve 7 is detachably attached to the valve hole of the movable reflector 3.
The drive unit 2 is composed of a power source such as a motor and a speed reduction mechanism, is designed in consideration of the repulsive force (load) of the covered electric wire 4, and is fixed to the base plate 5. A connector 8 that is electrically connected to the valve 7 is detachably attached to the rear portion of the movable reflector 3. The movable reflector 3 reciprocates (reciprocates) in the direction of arrow a with the output shaft 6 as the center of rotation c.

The covered electric wire 4 has one end connected to the connector 8 and the other end connected to a power source (not shown),
Further, the intermediate portion thereof is fixedly attached to the base plate 5 via the clip 9. In the covered portion of the covered electric wire 4, at least a portion near the movable reflector 3 including a fixed portion by the clip 9 is formed of an elastic insulating resin material. Therefore, when the covered electric wire 4 in this portion is deformed from the free state by bending and / or twisting, a repulsive force for returning to the free state is generated by the covering portion of the elastic insulating resin material. The elastic biasing portion 10 is formed by deforming the covered electric wire 4 so as to accumulate this repulsive force.

In this embodiment, the elastically biasing portion 10 is formed by bending the portion of the covered electric wire 4 near the movable reflector 3 including the portion fixed by the clip 9 into a U-shape, and further forming the U-shaped upper portion 4a. r Arrow direction (see Fig. 1)
It is composed by twisting. In this embodiment,
The elastic biasing portion 10 is composed of two covered electric wires 4.

The coated electric wire 4 at this time has, for example, the same specifications as a heat-resistant low-voltage electric wire for automobiles (for example, a conductor nominal cross-sectional area of 0.75 to 1.25 mm ² and a covering portion thickness of 0.5 to 0). 0.6 mm), preferably with a coating formed of ethylene tetrafluoride ethylene. The elastic biasing portion 10 has a length of 100 from the fixed end W1 by the clip 9 to the bent end W2 for connecting to the connector 8.
˜170 mm (135 mm in this embodiment) of the covered electric wire 4 has a curvature R of 20 mm or less (10 to 1 in this embodiment).
It is formed by bending it into a U-shape so as to be about 1). The length of the covered electric wire 4 is determined in consideration of the ease of removing the valve 7. As the ethylene tetrafluoride ethylene, for example, one having attributes of dielectric strength (KV / mm) 20 to 35, dielectric constant 2.6, tensile strength (MPa) 59 to 69, and specific gravity 1.7 is used.

The elastically biasing portion 10 constructed as described above.
Can apply a repulsive force that biases the movable reflector 3 in the f direction within the range of mechanical play during driving.

That is, FIG. 2 shows the initial position (setting position) (FIG. 2 (a)) and the turning position after turning to the right (FIG. 2 (b)) according to the present embodiment. 3 is swung from the initial position to the swivel position against the repulsive force f of the elastic urging portion 10, but conversely, the return from the swivel position to the initial position is performed by the repulsive force of the elastic urging portion 10. It turns in the same direction as f, and a quick return operation can be expected.

The repulsive force f of the elastically biasing portion 10 can be obtained by combining a plurality of repulsive forces generated by the following deformation of the covered electric wire 4.

That is, in the covered electric wire 4 shown in FIG. 3, a movable body M1 which linearly reciprocates in the horizontal plane (indicated by an arrow m1 in the drawing) is connected to the tip of the covered electric wire 4, and the middle portion thereof has a curvature R.
It is configured by bending the whole body to be deformed into a U-shape and fixing the rear end side portion with respect to the bent portion. The movable body M1 reciprocates m1 with a change in the length of the U-shaped upper side of the covered electric wire 4 after deformation. In this configuration, the repulsive force f1 of the covered electric wire 4 acts on the movable body M1.

In the covered electric wire 4 shown in FIG. 4, a movable body M2 which reciprocates in an arc in a vertical plane (indicated by an arrow m2 in the drawing) is connected to the tip of the covered electric wire 4, and an intermediate portion thereof has a curvature R. It is configured by bending the whole body to be deformed into a U-shape and fixing the rear end side portion with respect to the bent portion. The movable body M2 reciprocates m2 with a change in the curvature R of the bent portion. In this configuration, the repulsive force f2 of the covered electric wire 4 acts on the movable body M2.

Further, in the covered electric wire 4 shown in FIG. 5, a movable body M3 which reciprocates in an arc in a horizontal plane (indicated by an arrow m3 in the figure) is connected to the tip of the covered electric wire 4, and an intermediate portion thereof has a curvature R. It is formed by bending and deforming the whole into a U-shape, and fixing the rear end side portion of the bent portion to P (FIG. 5).
(A)). The movable body M3 reciprocates m3 in the arc direction while maintaining the same height (in the horizontal plane) without changing the curvature R of the bent portion (FIG. 5 (b)). With this configuration,
Repulsive force f3 or f of the covered electric wire 4 against the movable body M3
4 works.

The repulsive force f of the elastic biasing portion 10 in this embodiment can be obtained by combining the repulsive force f2 (see FIG. 4) and the repulsive force f3 (or f4) (see FIG. 5).

In the light distribution control mechanism 1 thus constructed, the movable reflector 3 has a mechanical play due to the elastic biasing portion 10 formed by forming the covering portion of the covered electric wire 4 with ethylene tetrafluoride ethylene. Since the driving can be performed within the range of (3) without being biased and there is no rattling, it is possible to perform highly accurate position control of the operation stop position.

In addition, the elastic biasing portion 10 can be constructed by using the covered electric wire 4 for supplying the electric power to the valve 7 without requiring any dedicated biasing member, so that the elastic biasing portion is required. It is not necessary to secure a new installation space for 10, and the number of parts does not increase.

Further, since the covering portion of the covered electric wire 4 is made of ethylene tetrafluoroethylene, the ambient temperature is -40.degree.
Even if the temperature changes within the range of 120 ° C., high elasticity can be maintained without softening or hardening with respect to the temperature change, so that the elastic biasing portion 10 with a small change width of the elastic force with respect to the temperature change. Can be configured.

Furthermore, ethylene tetrafluoride ethylene is
Since it has good lubricity, the covering portion of the covered electric wire 4 does not wear even when the electric wires 4 rub against each other when the movable reflector 3 is repeatedly driven, or against the electric wire 4 and other members. It is possible to provide the light distribution control mechanism 1 including the elastically biasing portion 10 having improved durability and reliability as a whole.

The covering portion of the covered electric wire 4 is sufficient if at least the portion near the movable reflector 3 from the fixed portion by the clip 9 is formed of ethylene tetrafluoride ethylene, and the other portions are crosslinked vinyl for automobiles and automobiles. By using a resin material such as cross-linked polyethylene for use, cost increase can be suppressed.

Further, the present invention is not limited to the above-mentioned embodiment, but can be applied to any reciprocating drive mechanism provided with a movable body for reciprocating drive. At this time, the reciprocal driving direction of the movable body is not limited.

[0035]

As described above, according to the invention of claim 1, the movable body is mechanically constituted by the elastic urging portion formed by forming the covering portion of the covered electric wire with the elastic insulating resin material. Since it can be driven in a state of being biased within the range of play, it is possible to perform highly accurate position control of the operation stop position.

Moreover, since the elastic biasing portion can be constructed by using the covered electric wire for supplying the electric power to the valve without requiring any dedicated biasing member, the elastic biasing portion can be provided. There is no need to secure a new installation space, and there is no increase in the number of parts.

According to the second aspect of the present invention, the movable reflector in the light distribution control mechanism has a mechanical play due to the elastic biasing portion formed by forming the covering portion of the covered electric wire with the elastic insulating resin material. Since it is possible to drive in a state of being biased within the range, in addition to the effect of the invention of claim 1, it is possible to perform highly accurate position control of the operation stop position.

According to the third aspect of the invention, since ethylene tetrafluoride ethylene is used as the elastic insulating resin material forming the covering portion of the covered electric wire, the ambient temperature is from -40 ° C to
Even if it changes within the range of 120 ° C, it has high elasticity without being softened or hardened due to temperature change and has good smoothness, so that it is an electric wire generated when the movable body is repeatedly driven. In addition to the effect of the invention of claim 1 or 2, elasticity is improved in durability and reliability because the coating portion is not worn even when the electric wire and other members rub against each other. A reciprocating drive mechanism having a biasing portion can be provided.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a light distribution control mechanism (reciprocating drive mechanism) as an embodiment of the present invention.

2A and 2B are plan views for explaining the operation of the light distribution control mechanism of FIG. 1, in which FIG. 2A shows an initial position and FIG. 2B shows a turning position.

FIG. 3 is an explanatory diagram of a repulsive force of a covered electric wire that acts on a movable body that linearly reciprocates in a horizontal plane in a modified pattern of the covered electric wire.

FIG. 4 is an explanatory diagram of a repulsive force of a covered electric wire that acts on a movable body that reciprocates in an arc in a vertical plane in a modified pattern of the covered electric wire.

5A and 5B are explanatory views of the repulsive force of a covered electric wire that acts on a movable body that reciprocates in an arc in a horizontal plane in a modified pattern of the covered electric wire, in which FIG. 5A is a side view and FIG. 5B is a plan view. It is a figure.

[Explanation of symbols]

1 Light distribution control mechanism (reciprocating drive mechanism) 2 drive 3 Movable reflector (movable body) 4 covered electric wire 5 Base plate (fixing member) 9 clips (fixed part) 10 Elastically biased part f Repulsive force (of coated wire)

Claims (3)

[Claims] 1. A movable body that is reciprocally driven by a drive unit,
In a reciprocating drive mechanism configured to include a covered electric wire connected to the movable body, the covered electric wire is fixed with an intermediate portion fixed to a fixing member, and at least the fixed portion is included. The covering portion of the portion closer to the movable body constitutes an elastic biasing portion which is formed of an elastic insulating resin material and biases the movable body within the range of mechanical play during driving by the repulsive force of the covered electric wire. Reciprocating drive mechanism characterized by being 2. The reciprocating drive mechanism according to claim 1, wherein the movable body is a movable reflector of a light distribution control mechanism mounted on the vehicle and illuminating a turning direction of the vehicle. mechanism. 3. The reciprocating drive mechanism according to claim 1, wherein the elastic insulating resin material is ethylene tetrafluoride ethylene.