JPH0646090Y2 - Electric telescopic antenna drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an electric telescopic antenna driving device which is extremely suitable for an electric telescopic antenna mounted on, for example, an automobile.

[Prior Art] An electric telescopic antenna mounted on an automobile or the like is generally configured such that a telescope type antenna element expands or contracts when a motor is normally or reversely rotated. When the antenna element completes the extension operation or the contraction operation, the antenna element does not operate any more. Therefore, an excessive load is suddenly applied to the motor. Therefore, if this state is left as it is, an excessive current continues to flow in the motor winding, which causes burnout of the winding. In order to prevent such a situation from occurring, a clutch is usually interposed between the motor side and the antenna side. In this clutch, the driving side clutch plate and the driven side clutch plate are slidably pressed against each other, and when the antenna expansion or contraction operation is completed, the driving side and driven side clutch plates are caused to slip and the motor The connection between the antenna side and the antenna side is temporarily released.

[Problems to be Solved by the Invention] In the clutch having the above-described configuration, noise is large when the clutch plate is slipping, and the clutch plate is heavily worn, so that the clutch pressure drops within a relatively short period. Therefore, the rotational force cannot be stably transmitted from the driving side to the driven side over a long period of time, and there is a drawback that reliability is lacking.

The object of the present invention is not only to alleviate a sudden load increase at the completion of the expansion / contraction operation of the antenna element and to avoid burnout of the motor winding, but it is also appropriate when the expansion / contraction operation of the antenna element is started and completed. The shock-absorbing function is simple, and the torque from the drive side to the driven side can be transmitted stably over a long period of time. Moreover, there is no clutch plate slip noise, etc. An object is to provide an antenna driving device.

[Means for Solving the Problems] In order to solve the above problems and achieve the object, the following measures were taken in the present invention.

That is, a rotational force transmission mechanism that is interposed between the drive-side base body and the driven-side base body and transmits the rotational force of the drive-side base body to the driven-side base body is provided on either the opposing surface of the drive-side base body or the driven-side base body. On the other hand, the coil spring and the rubber elastic body are provided so as to be spaced apart from each other so as to form a pair along the circumferential direction, and the coil spring and the rubber elastic body are provided between the drive side base body and the driven side base body. The coil spring and the rubber-like elastic body are sequentially compressed and deformed in accordance with the rotation of the drive-side base body and the driven-side base body. Due to the movement of the protrusion due to the relative rotation of the antenna element, only the coil spring is compressed and deformed at the start of the expansion and contraction operation of the antenna element. During Tsuido of time such as the coil spring and the rubber elastic body is provided as is compressed and deformed simultaneously.

[Operation] As a result of taking the above means, the following operation occurs.

(A) "Rotating force on the driving side""Resilient member in which a coil spring and a rubber elastic body are arranged separately on the same circumference" interposed between a driving side base body and a driven side base body. Since it is configured to be transmitted to the driven side through the coil element, at the time of so-called starting such as when the extension operation or the contraction operation of the antenna element is started, first, the coil spring is in a state of being compressed and deformed to some extent. The rotational force is transmitted from the driving side base body to the driven side base body, and the expansion / contraction operation of the antenna element is started. Thus, due to the elastic force of the coil spring, the initial cushion at the time of starting is performed and the shock at the time of starting is reduced. Unlike the case of using the conventional clutch element, there is no risk of slippage and the like, so that the rotational force on the drive side is stably transmitted to the driven side for a long period of time.

(B) When the extension operation of the antenna element is completed or when the contraction operation is completed, that is, at the time of so-called final movement, the driven-side base body connected to the antenna element immediately stops rotating, but the drive side directly connected to the motor. The base body continues to rotate as it is due to the moment of inertia of the drive side mechanism. Therefore, the coil spring is further compressed and deformed, and at the same time, the rubber elastic body is also compressed and deformed. Thus, the drive-side base body slightly rotates and then stops. By this operation, the moment of inertia of the entire drive side mechanism including the motor is absorbed, and the shock at the time of so-called final movement such as when the rotation is stopped, that is, when the expansion and contraction operation of the antenna element is completed is alleviated. Further, for the motor, a sudden increase in load is relieved, so that the flow of excessive current is suppressed.

(C) The co-acting cushioning action by the simultaneous deformation of the coil spring and the rubber elastic body at the time of the final movement is more excellent than the cushioning action of the coil spring alone at least as the cushioning action at the final movement. Become. In other words, the rate of increase in the repulsive force with respect to the amount of displacement is much higher than in the case where the coil spring is used alone, so the ability to absorb the large impact force that the drive-side base body receives when it finally locks. Will be dramatically improved.

When performing the above-mentioned initial buffering, a soft buffering is desired because the load itself is small. Therefore, in this case, the coil spring alone is more suitable. Thus, an appropriate buffer can be provided according to the purpose.

(D) As described above, at the time of so-called termination at the time of completion of the extension operation or contraction operation of the antenna element, the so-called termination at the time of so-called termination due to the combined elastic force of the coil spring and the rubber elastic body. In addition to the final buffering of the clutch, it is possible to satisfactorily mitigate a large shock at the time of final movement, and unlike the case where a conventional clutch element is used, an operation equivalent to a slip between clutch plates is performed. Since slipping is not performed at all, there is no possibility that slip noise will occur.

If the completion of the antenna expansion / contraction operation is detected by an appropriate detection means and the motor power supply is cut off during the period in which the buffering operation is being executed, the motor winding will not be burnt or the like.

[Embodiment] FIGS. 1 to 4 are views showing an embodiment of the present invention. FIG. 1 is a plan view showing a part of a driven body and a rotational force transmitting mechanism, and FIG. 2 is a drive body. FIG. 3 is a plan view showing a part of the rotational force transmission mechanism, FIG. 3 is an operation explanatory view showing a state in which those shown in FIG. 1 and FIG. 2 are integrally coupled, and FIG. 4 is A of FIG. It is a sectional view taken along line A-A.

The electric telescopic antenna drive device of the present embodiment is provided with a disk-shaped drive-side base body 20 that is rotated by motor power, and is provided concentrically adjacent to the drive-side base body 20, and the antenna element is extended by rotating. Alternatively, it is interposed between the disk-shaped driven-side base body 10 to be reduced and the driving-side base body 20 and the driven-side base body 10, and the rotational force of the driving-side base body 20 is applied to the driven-side base body.
And a rotational force transmission mechanism for transmitting the rotational force to the shaft 10.

The drive-side base body 20 is integrally molded of a material such as hard synthetic resin, has a shaft cylinder portion 21 at the central portion, and has a gear portion 22 that meshes with a worm gear provided on the motor shaft at the outer peripheral portion. Further, on the surface 23 of the drive-side base body 20 facing the driven-side base body 10, a pair of protrusions 24, 25 as one element of the rotational force transmission mechanism are provided.
Are projected along the circumferential direction.

As shown in FIG. 2, the protrusions 24 and 25 are supported on supports 26 and 27 having an arc shape and a large wall thickness. The projections 24 and 25 are for compressing and deforming the coil spring 18 and the rubber elastic body 17, which will be described below, with the relative rotation of the drive side base body 20 and the driven side base body 10.

The driven-side base body 10 is also integrally formed of a material such as hard synthetic resin, has a shaft cylinder portion 11 in the central portion, and meshes with a rack portion of a rope with a rack (not shown) for transferring antenna elements in the outer peripheral portion. It has a gear part 12 for rotating. In addition, the driven side substrate 10
A rubber elastic body holding portion 14 and a coil spring holding portion 15 are provided on the surface 13 facing the drive side base body 20 so as to project in the circumferential direction.

A guide groove 16 is provided so as to connect both holding portions.
A rubber elastic body 17 and a coil spring 18, which are elements of a rotational force transmission mechanism, are attached to the holding portions 14 and 15, respectively.

The coil spring 18 is loaded in a compressed state to some extent. The coil spring 18 and the rubber elastic body 17 are rotated by the projections 24 and 25 as the drive side base body 20 and the driven side base body 10 rotate relative to each other.
The elastic deformation of the rubber elastic body 17 is started in this order.

Next, the operation of this embodiment configured as described above will be described.

When the motor (not shown) is rotated in the forward direction to extend the antenna element, the drive-side base body 20 rotates, for example, clockwise in FIG. Then, the pressing tip portion of the protrusion 25 collides with one end of the coil spring 18. Therefore, the coil spring 18 is compressed and deformed. When this amount of compressive deformation reaches a predetermined level, the rotational force of the drive side base body 20 is transmitted to the driven side base body 10 as a sufficient rotational force. When the transmitted rotational force exceeds the magnitude of the load on the antenna element side coupled to the driven side base body 10, the driven side base body 10 rotates together with the drive side base body 20. As a result, the rope with the rack is transferred, and the antenna element (not shown) is extended.

When the antenna element completes the extension operation, the transfer operation of the rope with rack is stopped. Therefore, the driven side substrate 10 can no longer continue to rotate, and stops rotating at that position. On the other hand, the drive-side base body 20 directly connected to the motor tries to continue to rotate as it is due to its inertia moment. Therefore, the pressing tip portion of the projection 25 further compresses the coil spring 18. At this time, the pressing tip of the projection 24 is in contact with one end of the rubber elastic body 17. The drive-side base body 20 further rotates the rubber elastic body 17 and the coil spring 18 having such a state at the pressing tips of the protrusions 24 and 25 while slightly rotating, and then stops. The motor power supply detects the completion of the antenna expansion / contraction operation by an appropriate detection means and shuts off the inertia moment absorption operation during the period.

When the motor is rotated in the reverse direction to reduce the size of the antenna element, the drive side base body 20 is rotated in the reverse direction. Along with this, the pressing tips of the protrusions 24, 25 rotate in the opposite direction to the above-described case, the coil spring 18 is compressed and deformed, and the driven-side base body 10 rotates with the drive-side base body 20. Thus, the rope with the rack is transferred, and the antenna element (not shown) is contracted.

When the antenna element completes the contraction operation, the driven-side base body 10 immediately stops, and the drive-side base body 20 further compresses and deforms the coil spring 18 and the rubber elastic body 17, as in the case where the antenna element is extended. After turning a little, it stops. The motor power supply is also shut off in the same manner as described above.

According to this embodiment, the following operational effects are obtained. That is, in the present embodiment, the rotational force on the drive side is such that the “coil spring 18 and the rubber elastic body 17 are interposed between the drive-side base body 20 and the driven-side base body 10 and spaced apart on the same circumference. It is configured to be transmitted to the driven side via the "repellent member provided".

Therefore, at the time of so-called starting such as when the extension operation or the contraction operation of the antenna element is completed, first, when the coil spring 18 is in a state of being compressed and deformed to some extent, the rotational force from the drive side base body 20 to the driven side base body 10 is increased. Is transmitted, and the expansion / contraction operation of the antenna element is started. Thus, due to the elastic force of the coil spring 18, the initial cushion at the time of starting is performed, and the shock at the time of starting is alleviated.
Unlike the case of using the conventional clutch element, there is no risk of slippage and the like, so that the rotational force on the drive side is stably transmitted to the driven side for a long period of time.

At the time of so-called final movement such as completion of extension operation or reduction operation of the antenna element, the driven side base body 10 coupled to the antenna element immediately stops rotating, but the drive side base body 20 directly connected to the motor. Tries to continue rotating due to the moment of inertia of the drive side mechanism. Therefore, the coil spring 18 is further compressed and deformed, and at the same time, the rubber elastic body 17 is also compressed and deformed. Thus, the drive-side base body 20 slightly rotates and then stops. This operation absorbs the moment of inertia of the drive-side mechanism including the motor, and alleviates the impact at the time of rotation stop, that is, at the time of so-called final movement such as completion of the expansion and contraction operation of the antenna element. Further, for the motor, a sudden increase in load is relieved, so that the flow of excessive current is suppressed.

Coil spring 18 and rubber elastic body at the end of the above movement
The synergistic cushioning effect due to the simultaneous deformation with 17 is far superior to the cushioning effect of the coil spring 18 alone, at least as a cushioning effect at the time of final movement. That is, the increase ratio of the elastic force to the displacement amount is much higher than that of the coil spring 18 alone.
The ability to alleviate the large impact force that will be received when the 20 is finally locked will be dramatically improved.

When performing the above-mentioned initial buffering, a soft buffering is desired because the load itself is small. Therefore, in this case, the coil spring 18 alone is more suitable. Thus, an appropriate buffer can be provided according to the purpose.

As described above, when the extension operation or the contraction operation of the antenna element is completed, that is, at the time of the so-called final movement, the coil spring 18 and the rubber elastic body 17 are combined with each other so that the so-called final operation is performed. The final cushioning is performed, and it is possible to satisfactorily absorb large shocks at the time of final movement.In addition, unlike the case where the conventional clutch element is used, the operation equivalent to the slip between the clutch plates does not occur. Since it is not performed at all, there is no possibility that slip noise will occur.

If the completion of the antenna expansion / contraction operation is detected by an appropriate detection means and the motor power supply is cut off during the period in which the buffering operation is being executed, the motor winding will not be burnt or the like.

As shown in FIG. 4, the upper ends of the protrusions 24, 25 of the drive-side base body 20 move while entering the grooves 16 of the driven-side base body 10, so that the entire circumference of the annular portion of the coil spring 18 is projected. twenty five
It is uniformly pressed by the pressing tip of the. Therefore, stable compression operation is performed.

The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[Effect of the Invention] According to the present invention, the rotational force on the drive side causes the “coil spring and the rubber elastic body disposed between the drive-side base body and the driven-side base body to be spaced apart on the same circumference. Since it is configured to be transmitted to the driven side through the "repellent member provided", the sudden load increase at the completion of the expansion and contraction operation of the antenna element is mitigated, and the burnout of the motor winding can be avoided. Needless to say, proper cushioning functions are exhibited at the start and end of the expansion / contraction operation of the antenna element, and the rotational force can be stably transmitted from the driving side to the driven side for a long period of time. It is possible to provide an electric telescopic antenna drive device having a simple structure, which is free from the slip noise of the clutch plate, which has been a problem in the past.

[Brief description of drawings]

1 to 4 are views showing an embodiment of the present invention. FIG. 1 is a plan view showing a part of a driven side base body and a rotational force transmission mechanism, and FIG. 2 is a drive side base body and a rotational force transmission. FIG. 3 is a plan view showing a part of the mechanism, FIG. 3 is an operation explanatory view showing a state in which those shown in FIG. 1 and FIG. 2 are integrally coupled, and FIG. 4 is an arrow line AA in FIG. FIG. 10 ... Driven side base body, 17 ... Rubber elastic body, 18 ... Coil spring, 20 ... Drive side base body, 24, 25 ... Projections.

Claims (1)

[Scope of utility model registration request] 1. A disk-shaped drive-side base body that is rotated by a motor power, and a disk-shaped driven-side base body that is concentrically adjacent to the drive-side base body and that rotates to extend or contract an antenna element. A rotational force transmission mechanism that is interposed between the drive-side base body and the driven-side base body and transmits the rotational force of the drive-side base body to the driven-side base body, wherein the rotational-force transmission mechanism is the drive-side base body. And a coil spring and a rubber elastic body which are provided on either one of the facing surfaces of the driven side base body so as to be spaced apart so as to form a pair along the circumferential direction, and the coil spring and the rubber elastic body are provided on the drive side. A projection provided on the other of the opposing surfaces of the drive-side base and the driven-side base so that the coil spring and the rubber elastic body are sequentially compressed and deformed as the base and the driven-side base rotate relative to each other; By the movement of the protrusion due to the relative rotation of the drive side base body and the driven side base body, only the coil spring is compressed and deformed at the time of start-up such as when the expansion and contraction operation of the antenna element is started, An electric telescopic antenna drive device, wherein the coil spring and the rubber elastic body are provided so as to be simultaneously compressed and deformed at the time of final movement such as completion of expansion and contraction of the antenna element.