JPH0487848A - Drive device for telescopic pole for vehicle - Google Patents

Abstract

PURPOSE:To simplify constitution by transmitting rotation of an electric motor from a center gear to a winding drum through a cushion body, in a device to rotate a winding drum with the aid of an electric motor and telescope an telescopic pole, such as an antenna, through a drive cord. CONSTITUTION:When an electric motor 14 is run, a sensor gear 7 performs one full turn through a reduction mechanism comprising a worm 15, a worm wheel 16, and a small gear 17, and a winding drum 5 is driven in a forward direction through a cushion body 12 engaged with a protrusion 13 for engagement of the center gear 7. As a result, a drive cord 8 in a cord winding groove 9 is unwound to expand a telescopic pole 1. When the electric motor 14 is reversed, the drive cord 8 is wound to contract the telescopic pole 1. In this case, rotation inertia of the electric motor 14 and the center gear 7 is absorbed by means of the cushion body 12. This constitution eliminates a clutch part, simplifies a mechanism, and prevents the generation of clutch noise.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a telescopic pole for a vehicle that can be extended or contracted by remote control from inside the vehicle, such as a corner pole for displaying the vehicle width or an antenna pole for radio reception. The present invention relates to a drive device.

[Prior Art] Conventionally, as a device of this kind, there has been a device in which a retractable pole such as an antenna pole is expanded or contracted by rotating a winding drum with a reversible electric motor to pay out or wind up a drive cord. It is disclosed in JP-A-57-140002. In this conventional example, as a clutch device that transmits rotational force from an electric motor to a winding drum via a reduction gear, a center gear is fitted to a rotating shaft cylinder fitted to a center shaft, and a center gear is fitted to a rotating shaft cylinder fitted to a center shaft. A structure is adopted in which the clutch wheel and clutch spring fit together, and the clutch spring presses the clutch wheel against the side of the center gear.

[Problems to be Solved by the Invention] However, in such a structure, the clutch parts such as the clutch spring and the clutch wheel are relatively large, which not only increases the cost but also has the disadvantage that the clutch noise is too loud. In particular, when a switching control device is used to raise and lower a telescoping pole, there is a problem in that if there is an excess of energization time between the upper limit and the lower limit, the clutch operates during the remaining time and generates a rattling noise.

SUMMARY OF THE INVENTION An object of the present invention is to provide a telescopic pole drive device for a vehicle that improves the drawbacks of the conventional example, simplifies the mechanism, reduces costs, reduces the size, and eliminates clutch noise.

[Means for Solving the Problems] In order to achieve the above-mentioned object, in the drive device for a telescopic pole for a vehicle according to the present invention, a hollow shaft is provided integrally with a winding drum for a drive cord that drives the telescopic pole. a center gear which is rotated in forward and reverse directions by an electric motor via a speed reduction mechanism is rotatably fitted into the hollow shaft;
A cushion body made of an elastic material is interposed between the winding drum and the center gear, and fixed in the rotation direction between the center gear and the cushion body and between the cushion body and the winding drum, respectively. The invention is characterized in that it is provided with a locking means.

[Function 1] The vehicle telescopic pole drive device having the above-mentioned configuration can transmit the rotational force of the electric motor from the center gear to the winding drum via the cushion body, and when the winding drum stops, the cushion The body elastically deforms to absorb the rotational inertia of the electric motor.

[Example] The present invention will be described in detail based on an example in which the present invention is applied to a corner pole for displaying the vehicle width of an automobile.

FIG. 1 is a cross-sectional view, and FIG. 2 is a left side view of the telescopic pole in its fully extended state, excluding the cover. In the drawings, reference numeral 1 indicates an extendable pole constructed by sequentially fitting a plurality of metal pipes with different diameters in multiple layers, and reference numeral 2 indicates a drive unit for performing the extendable and retractable operations. Inside the cover 3 of the drive unit 2, a hollow shaft portion 6 integral with the winding drum 5 is fitted around the center shaft 4, and a center gear 7 is rotatably fitted into the hollow shaft portion 6. The winding drum 5 has an annular cord winding groove 9 for winding and accommodating a drive cord 8 made of synthetic resin for pushing up or retracting the telescopic pole 1.

Furthermore, as shown in FIGS. 3 and 4, the winding drum 5 is provided with an appropriate number of engaging protrusions 10, for example, three, at approximately equal intervals from the center. Each of them is provided with an oil reservoir hole 11 for storing a lubricant such as grease. Further, an oil-resistant cushion body 12 made of an elastic material such as rubber is interposed between the winding drum 5 and the center gear 7 so as to come into contact with a seat 5a provided on the winding drum 5. As shown in FIG. 5, the center gear 7 has a hollow shaft portion 7a that is fitted around the hollow shaft portion 6 of the winding drum 5, and the center gear 7 is positioned at approximately equal intervals around the hollow shaft portion 7a. to 3
The engagement protrusions 13 are provided.

As shown in FIGS. 6 and 7, the cushion body 12 has a substantially disk-like shape as a whole, and has a center hole 12a in the center of which is loosely fitted around the hollow shaft portion 7a of the center gear 7. However, around this center hole 12a, there is an engagement protrusion 1 of the winding drum 5.
Engagement holes 12b into which the center gear 7 is fitted, and engagement holes 12c into which the engagement protrusion I3 of the center gear 7 is fitted are provided alternately. Note that, if necessary, a deformation hole 12d may be provided between these engagement holes 12b and 12c to facilitate elastic deformation.

In the embodiment, an engagement protrusion and an engagement hole are used as the locking means for fixing the center gear 7 and the cushion body 12 and between the cushion body 12 and the winding drum 5 in the rotational direction. However, since any means for transmitting rotational force may be used, other locking means may be used, such as recessed and recessed means that mesh with each other.

As shown in FIGS. 1 and 2, the center gear 7 is driven in both forward and reverse directions by a DC motor 14 via a speed reduction mechanism.
A worm wheel 16 is meshed with a worm 15 fixed to the shaft of an electric motor 14, and a small diameter gear 17 integrated with the worm wheel 16 is meshed with a center gear 7.

A cord stopper 18 made of conductive metal is coupled to the terminal end of the drive cord 8 for securing the drive cord 8 in the cord winding groove 9. Also drive code 8
A conductive wire is inserted as a core material into the interior of the telescopic pole l for energizing the indicator lamp attached to the tip of the telescopic pole l, and this conductive wire is electrically connected to the cord stopper 18, 1 is extended, the cord stopper 18 is connected to the contact piece 1 provided in the cord winding groove 9.
9 to turn on the indicator lamp, and when the telescopic pole 1 is contracted, it separates from the contact piece 19 and turns off the indicator lamp. Further, as a means for supplying power to the contact piece 19, a sliding contact piece 20 connected to the contact piece 19 is attached to the outer surface of the winding drum 5, and a fixed contact piece 20 connected to a power source is attached to the outer surface of the winding drum 5.
This sliding contact piece 20 is brought into sliding contact with. Note that 22 is a cord outlet that connects the base of the telescopic pole 1, and the drive cord 8 passes from the cord winding groove 9 of the winding drum 5 through this cord outlet 22 and is connected to the most advanced rod of the telescopic pole 1. has been done. In addition, 23 is a wheel shaft, 24 is a gear cover, 25 is a water drain hole, 26 is a stopper ring of the center gear 7, 27 is a rubber ring for attaching the telescopic pole 1 to the chassis 28, and 29 is a connecting pipe of the telescopic pole 1. It shows.

In the embodiment described above, when the electric motor 14 is rotated in the forward direction, the center gear 7 is rotated once in the forward direction via the speed reduction mechanism consisting of the worm 15, the worm wheel 16, and the small diameter gear 17, and the engagement protrusion 13 of the center gear 7 is rotated in the forward direction. Torque is transmitted to the winding drum 5 through the cushion body 12 engaged with the winding drum 5, and the winding drum 5 is driven in the forward direction. As a result, the drive cord 8 accommodated in the cord winding groove 9
is extended and the telescopic pole 1 begins to extend. When the drive cord 8 has finished being fed out and the telescopic pole 1 is fully extended, the rotation of the winding drum 5 is stopped by the cord stopper 18. When the winding drum 5 stops, the cushion body 12 undergoes some elastic deformation due to the rotational force of the electric Al 14 and the center gear 7, so the electric motor 14 and the center gear continue to rotate for a certain amount by the amount of deformation, and then eventually stop. do. During this time, the rotational inertia of the electric motor 14 is absorbed by the elastic deformation of the cushion body 12.

When the electric motor 14 is rotated in the opposite direction, the center gear 7 is also rotated in the opposite direction, so that the winding drum 5 also rotates in the opposite direction via the cushion body 12, winding up the drive cord 8 that has been fed out, and starting to retract the telescopic pole 1. . When the telescopic pole 1 finishes contracting, the winding drum 5 is caught by the cord stopper 18 and stopped, but in this case as well, the cushion body 12 undergoes some elastic deformation due to the rotational force of the electric motor 14 and the center gear 7. , absorbs the rotational inertia of the electric motor 14 and locks the electric motor 14.

Note that between the cushion body 12 and the center gear 7 and between the cushion body 12 and the winding drum 5, the cushion body 1
2 will be slid by the amount of elastic deformation, and in order to facilitate the sliding between them, lubricating oil such as grease is supplied from the oil reservoir hole 11.

Furthermore, stopping the electric motor 14 after the telescopic pole 1 is fully extended or fully retracted may be performed by operation from the driver's cab;
It is also possible to automatically stop the motor by using a switch switching mechanism described in Japanese Patent No. 02 or the like. Moreover, although the above-mentioned embodiment shows the case where the retractable pole 1 is a corner pole, it goes without saying that the present invention can be similarly applied to an antenna pole.

[Effects of the Invention] As explained above, in the vehicle telescopic pole driving device according to the present invention, a cushion body is interposed between the drive cord winding drum and the center gear that drives it, and the electric motor and the center gear are connected to each other. Since the rotational inertia of the gear is absorbed by the cushion body, clutch parts such as latch wheels and clutch springs can be omitted as in the past.
Not only can the structure be significantly simplified, reducing costs and downsizing the product, but it also has the remarkable effect of eliminating the conventional clutch noise.

[Brief explanation of drawings]

The drawings show an embodiment of the driving device for a telescopic pole for a vehicle according to the present invention, and FIG. 1 is a sectional view of an embodiment in which the present invention is applied to a corner pole, and FIG. 2 is a left side view with the cover removed. Figure 3 is a sectional view of the winding drum, Figure 4 is its right side view, Figure 5 is a side view of the center gear, Figure 6 is a front view of the cushion body, and Figure 7 is its sectional view. be. 1 is a telescopic pole, 2 is a drive unit, 3 is a cover, 4 is a center shaft, 5 is a winding drum, 6 is a hollow shaft part, 7 is a center gear, 8 is a drive cord, 9 is a cord winding groove, 10 is a cord winding groove 11 is an oil sump hole; 12 is a cushion body; 12
b, 12c are engagement holes, 13 is an engagement protrusion, 14 is a DC motor, 15 is a worm, 16 is a worm wheel, 17
1 is a small diameter gear, 18 is a cord stopper, 19 is a contact piece, O is a sliding contact piece, and 1 is a fixed contact piece. Patent Taganjin Co., Ltd.

Claims (1)

[Claims] 1. A hollow shaft portion provided integrally with the winding drum of the drive cord that drives the telescoping pole is fitted into the center shaft, and the center gear, which is rotated forward and backward by the electric motor via the deceleration mechanism, is A cushion body made of an elastic material is interposed between the winding drum and the center gear, and is rotatably fitted into the hollow shaft portion, and a cushion body made of an elastic material is interposed between the center gear and the cushion body and between the cushion body and the winding drum. A driving device for a telescopic pole for a vehicle, characterized in that it is provided with locking means for fixing in the rotational direction between the pole and the drum. 2. Claim 1, wherein engaging protrusions are provided on each of the winding drum and the center gear as the locking means, and these engaging protrusions are engaged with engagement holes provided in the cushion body.
A driving device for a telescopic pole for a vehicle as described in .