JPS6115606Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a vehicle electric telescoping antenna device installed in a vehicle such as an automobile, and in particular, a flexible wire for driving an antenna element is transferred and driven by a pulley, and the wire is driven by a pulley. The present invention relates to an antenna device that is wound and stored in a wire storage drum.

A conventionally known antenna device of this type includes a wheel to which rotational force of a motor is applied via a worm gear, a wire transfer pulley, and a wire storage drum, which are arranged concentrically, and the wire is transferred by the pulley. The wire is wound and stored in the storage drum.

In conventional equipment with the above configuration, if the diameter of the pulley is made sufficiently smaller than the diameter of the wheel in order to reduce the size of the motor, the pulley and the wire storage drum are arranged concentrically, so they have the same diameter. Using a wire storage drum increases the degree of curvature of the wire. An increase in the degree of curvature of the wire deteriorates the durability of the wire. In particular, when a wire made of hard synthetic resin or the like is repeatedly wound and stored with a large degree of curvature, a large strain stress is applied to the wire, resulting in cracking or breakage within a short period of time. For this reason, in general, the diameter of the pulley is approximately the same as the diameter of the drum, and the reduction ratio between the worm gear and the wheel is used to compensate for the lack of power when downsizing the motor. However, in reality, the reduction ratio between the worm gear and the wheel is approximately 1/50, so
There is a problem that the motor cannot be made much smaller by using only the above-mentioned means.

It should be noted that recent automobiles are increasingly equipped with various electronic devices. Therefore, electrical components are required to prevent malfunctions and unstable operations of these electronic devices due to a drop in battery power supply voltage. However, as described above, if the motor cannot be made much smaller, a considerably large starting current will flow instantaneously when the antenna element is extended and retracted, and the power supply voltage will inevitably drop.

This idea was devised in consideration of these circumstances, and its purpose was to mechanically increase the reduction ratio of the motor, reduce the size of the motor, and make it possible to fit into a wire storage drum with a relatively small diameter. Therefore, it is an object of the present invention to provide an electric telescoping antenna device for a vehicle in which the wire can be smoothly wound and stored without applying an extremely large strain stress to the wire.

The details of this invention will be clarified below with reference to embodiments shown in the drawings. FIG. 1 is a side view showing an embodiment of this invention. In FIG. 1, 1 is a small DC motor, 2 is a wire drive mechanism storage case, 3 is a wire storage drum, 4 is an antenna element storage tube, and 5 is a mounting element for fixing the top of the storage tube to the vehicle body wall 6. , 7 is a telescopic rod antenna element that is removably housed in the housing cylinder. 1st
As is clear from the figure, this device differs from the conventional device in appearance in that the axis of the wire storage drum 3 is offset by a predetermined distance from the axis of the wire drive mechanism storage case. This is a different characteristic point.

FIG. 2 is a diagram showing the configuration of the main parts of this device, and 8 in the figure is a worm gear provided on the shaft of the motor 1. As shown in FIG. This worm gear 8 is introduced into the wire drive mechanism housing case 2, and meshes with the circumferential surface of a wheel 9 rotatably housed within the case at a reduction ratio of 1/50. Reference numeral 10 denotes a wire transfer pulley, which is connected to one side of the wheel 9 via a clutch plate (not shown), and rotates as the wheel 9 rotates. The pulley 10 is arranged concentrically with the wheel 9, and has a diameter similar to that of the wheel 9.
It is set to 1/2. 11 is a flexible wire made of, for example, hard synthetic resin. One end side 11a of this wire 11 is introduced into the antenna element storage cylinder 4 from the bottom and connected to the drive end of the antenna element 7. Further, the other end side 11b of the flexible wire 11 is guided by a wire guide section 2a provided in the case 2, and is wound around the pulley 10 over about 1/4 of the circumference of the pulley 10. After passing through the circumferential area, the wire is wound and stored in the wire storage drum 3.

The wire storage portion of the wire storage drum 3 is configured such that, for example, an outer peripheral wall 3a and an inner peripheral wall 3b are coaxially arranged with a gap in which the wires can be stored therebetween. The outer circumferential wall 3a and the inner circumferential wall 3b of the drum 3 regulate the degree of curvature of the wire 11 when it is wound and housed. However, the strain stress caused by the degree of curvature of the wire 11 is set to be less than a specified value. Further, the position of the shaft 12 of the wire storage drum 3 is such that the "circle" forming the outer circumferential surface of the pulley 10 is substantially inscribed in the "circle" forming the circumferential surface of the outer circumferential wall 3a of the wire storage portion. As shown in the figure, the pulley 10 is set at a position offset from the shaft 13 by a predetermined distance.

In this device configured in this way, the motor 1 is operated to extend or contract the antenna element 7.
When the motor 1 is rotated forward or backward, the rotational force of the motor 1 is applied to the worm gear 8, wheel 9, and pulley 1.
0 to the flexible wire 11, and the wire 11 is driven to be transferred in the direction of arrow A or B. At this time, the rotational speed of the motor 1 is reduced to 1/50 between the worm gear 8 and the wheel 9, and to 1/2 between the wheel 9 and the pulley 10.
The speed is reduced to 1/100 in total. Therefore, the wire 11 has 100% of the rotational force of the motor 1, ignoring the loss in each part.
It will be transferred with twice the force. The antenna element 7 connected to the one end side 11a of the wire 11 transferred in this way is pushed out of the storage cylinder 4 by the wire 11 and becomes an extended state, or is stored by the wire 11. It is pulled into the cylinder 4 and becomes a contracted state.

In the above operation, the flexible wire 11 is smoothly transferred from the outer peripheral surface area of the pulley 10 into the wire storage drum 3 and from the drum 3 to the pulley outer peripheral surface area. That is, since the arc portion of the "circle" that contacts the wire 11 forming the outer peripheral surface of the pulley 10 almost coincides with the arc portion of the "circle" wire lead-in/out portion forming the drum outer peripheral wall 3a, the wire 11 is wound and stored in the drum in a natural curved state along the peripheral wall surface of the drum 3 without exhibiting an extreme local curved state.

Note that the same wire curvature as above is applied to pulley 1.
If the storage drum is to be secured by a storage drum arranged concentrically with 0, it is necessary to use a storage drum having a large diameter such as the arc 14 shown by the imaginary line in FIG.

Thus, although this device uses the wire storage drum 3 with a relatively small diameter, its diameter is utilized to the maximum, and it is possible to prevent the degree of curvature of the wire 11 from becoming locally large. . As a result, the strain stress of the wire 11 can be reduced and deterioration of durability can be prevented.

Note that this invention is not limited to the one embodiment described above. For example, in the above embodiment, the pulley 1
Although the case where the diameter of the wheel 0 is set to 1/2 of the diameter of the wheel 9 has been exemplified, the pulley diameter may be further reduced as long as no adverse effects such as slipping between the wire 11 and the pulley 10 occur. Further, in the above embodiment, the wire 1
1 is an ordinary wire having a circular cross section. However, the wire 11 may have, for example, a concave and convex portion for engagement in the longitudinal direction of the wire circumferential surface, and the pulley may have a tooth portion that engages with this concave and convex portion. The wire may be transferred and driven by a so-called pinion-rack coupling relationship using a wire provided on the outer circumferential surface. By doing this,
Since no slip occurs between the pulley and the wire, there is an advantage that the diameter of the pulley can be made as small as possible. Furthermore, in the embodiment described above, the one end side 11a of the wire 11 was guided into and out of the Anna element storage cylinder at a slight angle with respect to the connecting direction of the pulley 10.
If there is no risk of adverse effects such as slip between the pulley 10 and the wire 11, the dashed line 15 in FIG.
As shown in FIG. 2, the pulley may be guided in and out in the tangential direction of the pulley. In this way, wire 1
Since the portion of the wire 11 wound around the pulley 10 is reduced, the strain stress of the wire 11 in this portion can be brought close to zero.

As explained above, this invention makes the diameter of the wire transfer pulley smaller than the diameter of the motor rotation transmission wheel, and the inner diameter of the drum outer wall that regulates the degree of curvature when the wire is wound and stored. is at least larger than the outer diameter of the wire transfer pulley, and has a positional relationship such that the "circle" forming the outer peripheral surface of the pulley is approximately inscribed in the "circle" forming the inner peripheral surface of the drum outer peripheral wall. This is an electric telescopic antenna device for a vehicle, characterized in that the axial position of the wire storage drum is eccentric with respect to the axial position of the pulley.

Therefore, according to this invention, since the reduction ratio between the wheel and the pulley can be increased, the overall reduction ratio can be increased, the motor can be made smaller, and the wire storage drum can be attached to the pulley. Since the drum has a relatively small diameter, it is possible to provide an electric telescoping antenna device for a vehicle that can smoothly wind and store the wire without applying extremely large strain stress to the wire. .

[Brief explanation of the drawing]

FIG. 1 is a side view showing a schematic structure of an embodiment of this invention, and FIG. 2 is a side view showing the structure of the main part of the same embodiment. DESCRIPTION OF SYMBOLS 1...Small DC motor, 2...Wire drive mechanism housing case, 3...Wire storage drum, 7...Extendable rod antenna element, 8...Worm, 9...
...Wheel, 10...Wire transfer pulley, 11
... Flexible wire, 12 ... Shaft of wire storage drum, 13 ... Shaft of wire transfer pulley.

Claims (1)

[Scope of utility model registration request] A diameter of a motor, a worm gear provided on the shaft of the motor, a wheel rotationally driven by the worm gear, and a wheel provided concentrically with the wheel so as to rotate as the wheel rotates. A small diameter wire transfer pulley, a flexible wire that is driven to be transferred in the longitudinal direction by this pulley, and a telescoping antenna that has a driving end connected to one end of this wire and is driven to expand and contract as the wire is transferred. and a wire storage drum provided to wind and store the other end of the wire, the wire storage drum having an inner diameter of an outer circumferential wall of the drum that regulates the degree of curvature during winding of the wire. The wire has a positional relationship such that the "circle" that is larger than the outer diameter of the pulley and that forms the inner peripheral surface of the drum outer peripheral wall is substantially inscribed in the "circle" that forms the outer peripheral surface of the pulley. An electric telescopic antenna device for a vehicle, characterized in that the axial position of the storage drum is eccentric with respect to the axial position of the pulley.