JPH08222922A - Motor support structure for motor-driven antenna - Google Patents

Abstract

PURPOSE: To prevent an antenna element from projecting again from a low end position when an antenna element is contained. CONSTITUTION: A motor main body 1 is fitted to a case 10 so as to allow an outer circumferential hold part 5 to support the side face of the motor main body 1. Since the outer circumferential hold part 5 restricts only a rotating direction of the motor main body 1 and is moved in the axial direction, dispersion of the motor main body 1 is absorbed in response to a setting position of a thrust reception section 6. Since a prescribed mechanical friction is provided to a motor shaft 2, the drive of the motor main body 1 due to a reaction is restricted and the antenna element does not project again from a lower end position when the antenna element is contained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor support structure for an on-vehicle electric antenna which allows an antenna mounted on a vehicle body to be expanded and contracted from inside the vehicle.

[0002]

2. Description of the Related Art In-vehicle electric antennas capable of automatically expanding and contracting an antenna attached to a vehicle body in a vehicle have been conventionally used. However, antenna elements are generally expanded and contracted by a wire or a rope. Has been done. The antenna element is expanded and contracted by pulling out or winding the wire or rope with a motor.

An example of the structure of such an electric antenna (see Japanese Patent Laid-Open No. 5-206710) is shown in FIG. In the electric antenna shown in this figure, the expandable antenna element 1
5, one end of a rope (not shown) is fixed, and the rope is fed from the rotating body 13 or wound. The transmission gear 112 that rotationally drives the rotating body 13 includes the small gear 103 and the worm wheel 10.
It is connected via 2 to the worm gear 101 fixed to the motor shaft 111 of the motor 118. Therefore, the rotating body 113 is rotationally driven by the motor 118, and the antenna element 115 is extended or accommodated according to the rotating direction of the motor 118.

In the electric antenna constructed as described above, when the antenna element 115 is extended to the upper end, the rotating body 113 stops, but the motor 118 tries to keep rotating, so that the worm wheel 102 is supported by this force. It moves in the axial direction of the shaft 109. This allows
The contact of the slide switch 107 is switched to the motor 11
The power supply to 8 is stopped.

Also, when the antenna element 115 is housed to the lower end, the rotating body 113 also stops, but this time due to the rotating force of the motor 118, the worm wheel 102 this time.
Moves in the opposite direction on the support shaft 109. Then, the contacts of the slide switch 107 are switched again, and the power supply to the motor 118 is stopped. further,
FIG. 4 shows a structure of a conventional electric antenna having a structure different from that of FIG.
4, the electric antenna shown in FIG. 4 is different from the electric antenna shown in FIG. 3 in that the motor 118 is not housed in the case 110 but is fixed to the case 110. The description will be omitted.

By the way, a mounting structure of a motor in the above-mentioned conventional electric antenna is shown in FIG. 5, (a) is a front view thereof, and (b) is a side view thereof. As shown in FIG. 5, the motor 51 includes a motor mounting plate 54 and screws 55.
The motor mounting plate 54 is fixed to a body case 57 that is integrally molded. A worm gear 53 is mounted on a motor shaft 52 of the motor 51, and a worm wheel 56 is meshed with the worm gear 53. Further, both ends of the motor shaft 52 are in contact with the thrust receiving portion 58, and the thrust forces P1 and P2 are respectively applied to the motor shaft 5.
2 is applied.

The thrust force is applied to the motor shaft 52 as described above for the following reason. It is assumed that the motor 51 is rotated in the forward direction and the antenna element is extended.
When the antenna element extends to the upper end, the power supply to the motor 51 is stopped as described above. In this case, since the driving force is stored in the rope and the driving mechanism that are driving to extend the antenna element, the driving force stored in the rope and the driving mechanism is stopped at the same time when the motor 51 is stopped. The reversing force is applied to rotate the motor 51 in the reverse direction. Then, the rope is slightly wound around the rotating body, and the entire length of the antenna element fixed to the rope is slightly accommodated and shortened.

Further, when the motor 51 is rotated in the opposite direction to house the antenna element, when the antenna element is completely housed to the lower end, the motor 51 is stopped by the power supply as described above. However, the driving force stored in the rope and the driving mechanism becomes a reversing force, so that the motor 51 is rotated in the direction opposite to that at the time of storage. As a result, the antenna element slightly protrudes from the vehicle body.
In this way, even if the antenna element is housed in a small amount, it will be very aesthetically unpleasant to project, and it is necessary to turn on the antenna drive switch again to completely house the antenna element. Yes, the operation was complicated. Therefore, by applying a thrust force to the motor shaft 52, it becomes difficult for the motor shaft 52 to rotate even if a reversing force is applied to the motor shaft 52, and the antenna element is prevented from re-projecting when it is completely housed.

[0009]

In the conventional electric antenna shown in FIG. 5, L1 is the length by which the motor shaft 52 projects forward from the motor 51, and L2 is the motor 51.
The motor shaft 52 has a length protruding rearward from the motor mounting plate 54 on the basis of the matching point A for the lengths L1 and L2.
And the length L2 ′ from the motor mounting plate 54 to the other thrust receiving portion 58 are set. Further, as shown in FIG. 6, inside the motor 51, gaps S1 and S2 are provided between the bearings 62 inside the motor with respect to the length L0 of the rotor 61, and the axial movement of the rotor 61 is restricted. Has been done. The gaps S1 and S2 are 0.1 to 0.2 in a general small motor, respectively.
It is about mm.

L3 is the length from the front end of the rotor 61 to the tip of the shaft 52, and L4 is the length from the rear end of the rotor 61 to the rear end of the motor shaft 52. And
Since the lengths L1, L1, L3, L4, S1, S2 and L0 each have an allowable variation, the lengths L1 ′ and L
It was extremely difficult to set how much 2'should be set. Explaining the importance of setting the lengths L1 ′ and L2 ′, the magnitude of the thrust force received by the motor shaft 52 is determined according to the lengths L1 ′ and L2 ′. In some cases, the gaps S1 and S2 are small, so that the thrust receiving seat 62 inside the motor 51 receives the thrust force.

Then, the generated frictional force is changed, and a regulation force larger than a predetermined rotation regulation force is applied to the motor 51. Therefore, in the conventional motor support structure for the electric antenna, the reverse rotation of the motor 51 cannot be properly regulated, and it is difficult to completely store the antenna element at least when the antenna is stored. . Further, if the thrust load is too large, a large load remains on the drive rope and the drive mechanism after the lifting operation of the antenna rod is completed, and the durability of the drive rope and the drive parts is impaired.

Therefore, an object of the present invention is to provide a motor support structure for an electric antenna, which has excellent durability and can be completely housed at least when the antenna element is housed without re-projecting.

[0013]

In order to achieve the above object, a motor supporting structure for an electric antenna according to the present invention is an electric antenna provided with a drive unit for expanding and contracting an expandable antenna element using a wire or a rope. In the drive unit, at least a motor, a transmission mechanism that transmits a driving force of the motor to the wire or the rope, a thrust receiving unit that appropriately regulates a moving distance of a motor shaft of the motor in a thrust direction, A means for applying a lateral pressure to the motor shaft is provided, and the motor is fixed in the drive portion by a support means that is restricted in the rotation direction but movable in the axial direction. .

Further, in the motor supporting structure for the electric antenna, the side surface of the motor is held from both sides by the outer peripheral holding portion having a holding portion having a shape substantially equal to the cross-sectional shape of the motor, whereby the motor is driven. It is fixed to the drive unit, or is fixed so that rotation of the motor body is restricted by an outer peripheral holding unit that abuts a power supply terminal provided in the motor. Further, means for applying a lateral pressure to the motor shaft of the motor may be provided in the thrust receiving portion.

[0015]

According to the present invention, since the motor can be moved in the motor shaft direction, it is possible to prevent the thrust force from being received inside the motor. For this reason, the thrust receiving portion only reliably regulates the movement of the motor shaft in the thrust direction, and the rotation restraining force in the reverse rotation direction of the motor is limited to the lateral pressure applied to the shaft, so that the mechanical frictional force applied to the motor is easily fixed. Can be Therefore, when the antenna element is extended, it is possible to prevent the antenna element from slightly lowering from the upper end position, and it is possible to prevent the antenna element from re-projecting from the lower end position when housed. Furthermore, since an excessive rotation restriction force is not applied to the motor shaft, the durability of the drive rope and drive mechanism can be improved.

Further, since the position setting of the thrust receiving portion can be determined in consideration of only the variation of the total length of the motor shaft, the position setting can be easily performed.
Further, by applying a lateral pressure to the motor shaft and adjusting the lateral pressure, the mechanical reverse rotation phenomenon of the motor can be easily regulated.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the construction of an embodiment of a motor support structure for an electric antenna of the present invention. (A) is a front view, (b)
Is a side view. The overall structure of the electric antenna is as shown in FIG. 3 or FIG. As shown in this figure, the motor body 1 has an outer peripheral holding portion 5
It is fixed to the housing 10 (which is the case of the electric antenna) so that it can be held from both sides. The outer peripheral holding portion 5 is integrally molded with the housing 10, and its cross-sectional shape is substantially equal to the cross-sectional shape of the motor body 1.

The outer peripheral holding portions 5 are arranged at two positions before and after the motor body 1, but the number is not limited to two.
Although there may be three or more positions, the outer peripheral holding portion 5 only restricts the rotation of the motor body 1 in the rotation direction, and therefore the movement in the axial direction is possible. A thrust receiving portion 6 is provided at the front end and the rear end of the motor shaft 2 with a thrust gap. Further, the movement range of the motor body 1 may be regulated by the motor stopper 11 as shown in FIG. 2 so that the motor body 1 is not subjected to sudden movement due to vibration or the like. Further, a worm gear 3 is attached to the motor shaft 2, and the driving force of the motor body 1 is transmitted to a drive unit (not shown) via a worm wheel 4 that meshes with the worm gear 3.

The position of the thrust receiving portion 6 may be set at a position where the predetermined gaps S1 and S2 are provided in consideration of variations in the length L0 of the motor shaft 2.
As a result, when the rotor comes into contact with the bearing of the motor body 1 inside the motor 1 due to the variation of the motor body 1, the motor body 1 moves in the axial direction and absorbs it. Will not be subject to thrust at. Further, a constant mechanical frictional force (side pressure P3) can be applied to the motor shaft 2 by the side pressure portion 12, and the side pressure portion 12 applies the side pressure P3 to the motor shaft 2 to rotate it. It is regulated by the desired regulation force.

By the way, the motor body 1 shown in FIG. 1 has a cross-sectional shape with flat portions on both sides, but the cross-sectional shape of the motor body 1 is not limited to this, and there may be one having a circular cross-sectional shape. . Therefore, next, a modified example in which the cross-sectional shape of the motor body 1 is substantially circular in the present invention is shown in FIG. In this figure, (a) is a front view, (b) is a left side view,
(C) is a right side view, but as shown in these figures,
When the cross section of the motor body 1 is circular, even if the motor body 1 is held from both sides by the outer circumference holding portion 5, it is almost impossible to regulate the rotation of the motor body 1. Therefore, power is supplied to the motor body 1. The outer peripheral holding portion 8 is provided so as to come into contact with the power supply terminal 9 for controlling the rotation of the motor main body 1.

The outer peripheral holding portion 8 should be arranged at a position where the variation in the axial length of the motor body 1 can be sufficiently absorbed. In this modification, the movement range of the motor body 1 in the thrust direction is restricted by the motor stopper 1
1 is performed so that abrupt movement of the motor body 1 due to vibration or the like is not received inside the motor. Further, the thrust receiving portion 6 is provided with a lateral pressure pressing portion 7. The side pressure pressurizing section 7 applies a side pressure P3 to the motor shaft 2 in a direction orthogonal to the axial direction, and the rotation of the motor shaft 2 is restricted by the side pressure P3.

Therefore, in the above-described embodiment and modification, the regulation force of the rotation of the motor body 1 can be adjusted by adjusting the magnitude of the lateral pressure P3. In this case, since there is no variation in the direction perpendicular to the axis of the motor shaft 2 in the motor body 1 due to its structure, the lateral pressure P3 can be easily obtained.
The size of can be adjusted. This makes it possible to prevent the antenna element from slightly lowering from the upper end position when extended, and to reliably prevent the antenna element from re-projecting from the lower end position when housed.

If the driving force is stored in the rope or the driving mechanism for driving the antenna element,
Although the life of the rope and the drive mechanism is shortened, according to the present invention, since the regulation force of rotation can be adjusted, it is possible to release the accumulated reversal force and leave the minimum reversal force. The durability of the drive mechanism can be improved. Furthermore, since the motor body 1 is only held by the outer circumference holding portions 5 and 8 and no special part for fixing the motor body 1 is required, the number of assembling steps can be reduced.

In the vehicle-mounted electric antenna, the worm gear and the worm wheel have a special gear structure so that the worm gear can rotate from the worm wheel side so that the user can manually extend and retract the antenna element. ing. Therefore, as described above, by minimizing the rotation restraining force of the motor body 1, the antenna element can be manually expanded and contracted. Therefore, for example, when the antenna element is stretched and cannot be moved due to an electrical failure, the antenna element can be housed by a manual operation, and the antenna can be easily removed from the vehicle at the time of replacement.

[0025]

Since the present invention is configured as described above, the motor can move in the motor shaft direction, and the thrust force is prevented from being received inside the motor. Therefore, the mechanical frictional force in the thrust direction is minimized. Therefore, when the antenna element is extended, it is possible to prevent the antenna element from slightly lowering from the upper end position, and it is possible to prevent the antenna element from re-projecting from the lower end position when housed, and manually operate the antenna element. You can also do it.

Further, since the position setting of the thrust receiving portion can be determined in consideration of only the variation in the total length of the motor shaft, the position setting can be easily performed.
In addition, the mechanical reverse rotation phenomenon of the motor can be easily regulated by adjusting the lateral pressure applied to the motor shaft. Since the reversing force stored in the rope for driving the antenna element and the driving mechanism can be released and only the minimum necessary reversing force remains, the durability of the rope and the driving mechanism can be improved. Furthermore, since the motor body is only held by the outer peripheral holding portion and no component for fixing the motor body is particularly required, the number of assembling steps can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing the configuration of an embodiment of a motor support structure for an electric antenna of the present invention.

FIG. 2 is a diagram showing a configuration of a modified example of the embodiment of the motor support structure for the electric antenna of the present invention.

FIG. 3 is a diagram showing a configuration of a conventional electric antenna.

FIG. 4 is a diagram showing another configuration of a conventional electric antenna.

FIG. 5 is a diagram showing a configuration of a conventional motor support structure for an electric antenna.

FIG. 6 is a view showing a cross section of a conventional motor support structure for an electric antenna.

[Explanation of symbols]

 1 Motor Main Body 2 Motor Shaft 3 Worm Gear 4 Worm Wheel 5, 8 Outer Peripheral Holding Section 6 Thrust Receiving Section 7 Side Pressure Pressing Section 9 Power Supply Terminal 10 Housing 11 Motor Stopper 12 Side Pressing Section

Claims (4)

[Claims] 1. An electric antenna, comprising: a drive unit for extending and retracting an extendable antenna element using a wire or a rope, wherein at least a motor and a driving force of the motor are transmitted to the wire or rope in the drive unit. Transmission mechanism,
A thrust receiving portion that appropriately regulates the movement distance of the motor shaft of the motor in the thrust direction, and a unit that applies a lateral pressure to the motor shaft are provided, and the motor is regulated in the rotation direction thereof, but is in the axial direction. A motor support structure for an electric antenna, wherein the motor support structure is fixed in the drive section by a movable support means. 2. The motor is fixed to the drive unit by holding the side faces of the motor from both sides by an outer peripheral holding unit having a holding unit having a shape substantially equal to the sectional shape of the motor. The motor support structure for the electric antenna according to claim 1, wherein 3. The electric antenna according to claim 1, wherein the outer peripheral holding portion that abuts a power supply terminal provided in the motor is fixed so as to restrict rotation of the motor main body. Motor support structure. 4. The motor support structure for an electric antenna according to claim 1, wherein means for applying a lateral pressure to the motor shaft of the motor is provided in the thrust receiving portion. .