JPS6256368B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a clutch device for an electric telescopic antenna installed in an automobile or the like, and particularly to an improvement in a driving force transmission means.

[Technical background of the invention and its problems]

There are various conventional clutch devices for electric telescopic antennas of this type, but the typical ones include a driving clutch plate that rotates in response to driving force from a motor and a driven clutch plate that is connected to a load. are pressed into contact with each other, and during the antenna extension/retraction operation, a driving force is applied to the antenna side by the clutch force, that is, friction transmission force between the above-mentioned active clutch plate and the driven clutch plate, the antenna is extended/retracted, and the antenna extension/retraction operation is completed. When the driven clutch plate is stopped, the driving clutch plate is put into a slip state, and then a limit switch or the like is operated to stop the rotation of the driving clutch plate.

In order to obtain the required clutch force, a large number of concave and convex portions are usually formed on the pressure contact surfaces of the driving clutch plate and the driven clutch plate.

In the conventional clutch device configured as described above, the transmission of driving force from the motor side to the antenna side depends solely on frictional transmission between the driving clutch plate and the driven clutch plate. Therefore, a sufficiently large pressing force is required between the driving clutch plate and the driven clutch plate. For example, if the load required to extend the antenna is approximately 7.5 kg, a clutch plate with uneven pressure surfaces will weigh approximately 20 kg.
A clutch plate with no unevenness on the pressing surface requires a pressing force of approximately 30 to 50 kg.
As a result, a large and strong spring is required to ensure the above-mentioned pressure contact force, which forces the device to be large-sized.In addition, both clutch plates may slip when overloaded, that is, when the antenna extension/retraction operation is completed. The drawback was that the accompanying sliding noise produced a large amount of noise.

[Purpose of the invention]

The purpose of the present invention is not only to accurately transmit the driving force from the motor side to the antenna side, but also to enable the device to be made compact since the pressure contact force on the clutch portion is minimal, and to ensure that the clutch is An object of the present invention is to provide a clutch device for an electric telescoping antenna that produces very little sliding noise and very little noise.

[Summary of the invention]

In order to achieve the above object, the present invention is characterized by the following configuration. That is, an intermediate gear is rotatably provided on one side of a main drive rotating body that is rotatably fitted into the main shaft and rotates in response to driving force from a motor, with an axial center different from that of the main shaft. A clutch gear, which has a gear portion that meshes with the intermediate gear in one part and a clutch disc portion in the other part, is fitted into the main shaft so as to be freely rotatable. Then, the clutch plate is fitted onto the main shaft so as to be in contact with the disc portion of the clutch gear and rotate together with the main drive rotating body. Then, the clutch plate is brought into pressure contact with the disk portion of the clutch gear by a pressure contact means such as a spring. Further, a driven rotary body having a gear portion on its inner peripheral surface that meshes with the intermediate gear is fitted into the main shaft so as to be rotatable relative to the motive rotary body, and the driven rotary body transmits information from the movable rotary body. The driving force applied to the retractable antenna is applied to the retractable antenna.

In this way, the intermediate gear that meshes with the gear portion provided on the inner peripheral surface of the driven rotor and the clutch gear that meshes with this intermediate gear constitute a so-called speed increasing mechanism, and at the speed increasing end of this speed increasing mechanism, A clutch plate that rotates integrally with the main rotating body is pressed into contact with the disk part of a clutch gear to obtain a clutch force, and this clutch force prevents the rotation of the intermediate gear when the antenna is extended or retracted, thereby driving the main rotating body. It is characterized in that the force is directly transmitted to the driven rotating body via the intermediate gear whose rotation is prevented.

[Embodiments of the invention]

1 to 5 are views showing one embodiment of the present invention, in which FIG. 1 is an external perspective view showing the entire clutch device, FIG. 2 is a vertical sectional view, FIG. 3 is an exploded perspective view, and FIG. FIG. 4 is a partial perspective view with a part cut away, and FIG. 5 is a diagram showing the relationship between the rotational forces of each part. In FIGS. 1 to 4, reference numeral 1 denotes a pipe-shaped main shaft, which is rotatably fitted into a fixed support (not shown) installed in the base of the antenna driving device. A main rotating body 2 is rotatably fitted into the main shaft 1. The main rotating body 2 has a substantially disk shape as a whole, and has a gear portion 3 formed on its outer peripheral surface to receive a driving force from a motor (not shown). 4
is an intermediate gear made of a small gear, and is rotatably provided on one side of the main drive rotating body 2 with a different axis from the main shaft 1. Reference numeral 5 denotes a clutch gear, which is fitted into the main shaft 1 so as to be rotatable relative to the main drive rotating body 2. A gear portion 5a that meshes with the intermediate gear is formed on the outer periphery of the shaft cylinder of the clutch gear 5, and a clutch disk portion 5b is formed integrally with the shaft cylinder at the end of the shaft cylinder. 6 is a first clutch plate, and 7 is a second clutch plate. These first and second clutch plates 6, 7 are approximately ring-shaped, and rotate together with the main drive rotating body 2 with the annular portions in contact with both surfaces of the disc portion 5b of the clutch gear 5. installed. That is, protrusions 6a, 6b and 7a, 7b are provided at 180° different positions on each clutch plate 6, 7, and spacers 8 are provided between these protrusions 6a and 7a and between 6b and 7b, respectively. , 9 are engaged in the cut grooves 10 and 11 of the main drive rotating body 2. Spacers 8, 9 have cut grooves 10, 1
1 so as to be movable in the axial direction of the main shaft 1.

On the back surface of the first clutch plate 6, a coil spring 12a whose base end is supported by the main drive rotating body 2,
The tips of 12b and 12c are pressed together. Also the second
On the back side of the clutch plate 7, there are protrusions 14a, 14b,
14c is formed, and projections 15a, 15b, 1 formed on the inner bottom surface of the driven rotary body 13 are formed on the back surface thereof.
5c is in pressure contact. The protrusions 14a to 14c,
15a to 15c have gently sloped surfaces so that no significant resistance is generated during sliding.

The driven rotating body 13 has a cylindrical shape with a bottom, and is fitted into the main shaft 1 so as to be rotatable relative to the main rotating body 2. A gear portion that meshes with the intermediate gear 4 is formed on the inner circumferential surface of the peripheral wall of the driven rotor 13 that fits around the outer circumference of the main drive rotor 2. Further, a gear portion 16 is formed on the outer periphery of the driven rotary body 13 for transferring a drive cord for driving the telescopic antenna.

A push nut 17 is fitted into the distal end of the main shaft 1, which protrudes through the center hole of the driven rotor 13, while being pressed by a cap 18. Thus, the position of the driven rotor 13 in the axial direction with respect to the main shaft 1 is regulated by the push nut 17.

Next, the operation of the apparatus configured as described above will be explained. When a motor (not shown) is rotated forward or backward in order to extend or contract the antenna, the main rotating body 2 rotates forward or backward.
Then, the rotational force of the main rotating body 2 is directly transmitted to the driven rotating body 13 mainly through the intermediate gear 4, and as a result, the driven rotating body 13 rotates together with the main rotating body 2. That is, the driven rotary body 13 is loaded with the drive cord for driving the antenna, but the first and second clutch plates 6 and 7 are connected to the coil springs 12a to 12c and the driven rotary body 13.
The clutch gear 5 is held under narrow pressure by the protrusions 15a to 15c, and is in pressure contact with the disc portion 5b of the clutch gear 5, so that the clutch gear 5 is prevented from rotating relative to the first and second clutch plates 6, 7. ing.
Therefore, the intermediate gear 4 meshing with the clutch gear 5 is prevented from rotating with respect to the main drive rotating body 2, and only performs a revolution movement integrally with the main drive rotating body 2. Therefore, as a result, the main rotating body 2, the intermediate gear 4, and the clutch gear 5
Then, the first and second clutch plates 6, 7 and the driven rotating body 13 all rotate integrally. In this way, the drive cord is transferred by the gear section 16 as the driven rotor 13 rotates, and the antenna expands or contracts.

Once the antenna completes its extension or contraction motion,
The driven rotating body 13 stops its rotation and exhibits an overload condition. When this happens, the intermediate gear 4 attempts to start rotating in accordance with the relative rotation between the main rotating body 2, which continues to rotate, and the driven rotating body 13, which is in a stationary state. At this time, the rotational force transmitted from the intermediate gear 4 to the clutch gear 5 becomes strong, so
The first and second
The pressing force of the clutch plates 6 and 7 cannot resist the rotational force, and the clutch gear 5 begins to rotate at high speed. As a result, a so-called disengaged state occurs, and motor lock is avoided. Note that since the first and second clutch plates 6 and 7 continue to rotate together with the driving rotor 2, sliding occurs at the pressure contact portion between the second clutch plate 7 and the driven rotor 13; Since the pressure contact force is significantly smaller than that of conventional devices, the noise associated with sliding is slight.

Note that the second clutch plate 7 has protrusions 14a to 14.
c is provided, and the driven rotating body 13 is provided with a protrusion 15a.
15c, the amount of deflection of the coil springs 12a to 12c changes intermittently when the pressure contact portion slides. As a result, the pressure of the first and second clutch plates 6, 7 against the clutch gear 5 changes in a pulsating manner. Therefore, continuous sliding friction between the clutch gear 5 and the first and second clutch plates 6, 7 is avoided, and the occurrence of seizures and the like due to the friction can be prevented, and the minimum operation that conventionally required 8 to 9 V can be avoided. Voltage can be reduced to 6V or less.

If a limit switch (not shown) is activated when the antenna completes its expansion and contraction operation, the motor will stop rotating, and the rotation of the main rotating body 2, intermediate gear 4, clutch gear 5, and first and second clutch plates 6 and 7 will also stop. do.

In this way, in this device, the driven rotating body 13
An intermediate gear 4 that meshes with a gear portion provided on the inner circumferential surface of the intermediate gear 4 and a clutch gear 5 that meshes with this intermediate gear 4 constitute a so-called speed increasing mechanism due to the relationship of gear ratios. The first and second clutch plates 6 and 7, which rotate integrally with the main drive rotating body 2, are brought into pressure contact with the disk portion of the clutch gear 5, which is the end, to obtain a clutch force. Rotation of the gear 4 is prevented, and the driving force of the main rotating body 2 is directly transmitted to the driven rotating body 13 via the intermediate gear 4 whose rotation is prevented. Therefore, the clutching force may be significantly lower than in conventional devices. In other words, since conventional devices do not have a speed increasing mechanism,
For example, frictional transmission is performed at a portion corresponding to the pressure contact portion between the second clutch plate 7 and the driven rotating body 13 of this device. For this reason, it is necessary to obtain a clutch force that can withstand the load at the pressure welding part.
Extremely large pressure force is required. However, in this device, as described above, most of the driving force of the main rotating body 2 is transmitted to the driven rotating body 13 via the intermediate gear 4.
There is almost no friction transmission at the pressure contact portion between the second clutch plate 7 and the driven rotating body 13. The pressure contact portion merely supports the back surface of the second clutch plate 7 so that the pressing force of the coil springs 12a to 12c acts as a force to press the first and second clutch plates 6, 7 into contact with the clutch gear 5. It is something. The clutch force required between the clutch gear 5 and the first and second clutch plates 6, 7 is the rotational force applied to the intermediate gear 4 from the gear portion on the inner peripheral surface of the driven rotor 13 during the antenna expansion and contraction operation. It only needs to be large enough to hold it in a stationary state against the force. In this case, as described above, it is sufficient to obtain the clutch force at the disc portion 5b which is the speed increasing end, so a much smaller clutch force is sufficient compared to the conventional device.

According to the test and research carried out by the present inventors, it has been confirmed that in the case of the present device, a pressure contact force of only about 13 kg is sufficient, whereas with a conventional flat plate clutch, 30 to 50 kg is required.

FIG. 5 is a diagram showing the relationship between the rotational forces of each part of this device manufactured on an experimental basis. In FIG. 5, point A is the drive cord transfer gear part 16 of the driven rotary body 13, point B is the gear part on the inner peripheral surface of the driven rotary body 13, point C is the gear part 5a of the clutch gear 5, and point D is the gear part 5a of the clutch gear 5.
and the pressure contact portions of the first and second clutch plates 6, 7 are shown, respectively. The radii of points A to D are: A point = 27 mm, B point = 22.8 mm, C point = 6 mm, D point = 13.5
mm. Now, if the required rotational force at point A is 7.5 kg, the required rotational force at each point from point B to C is 8.8kg at point B.
Kg, point C is also 8.8Kg, and point D is 3.95Kg.
It has been found that the clutch pressure, that is, the pressing force necessary to secure the rotational force of 3.95 kg at point D, is sufficient if it is 13 kg as described above.

Note that the present invention is not limited to the above embodiments. For example, in the embodiment described above, the first and second clutch plates 6 and 7 were provided as clutch plates that press against the clutch gear, but the number of clutch plates is not limited to two, and may be three or more. That's fine, or just one piece (on one side) is fine. Further, in the above embodiment, the projections 14a to 14c and 15a to 1
Although the projections 5c are provided, these projections are not necessarily necessary and may be omitted. Of course, various other modifications can be made without departing from the gist of the present invention.

〔Effect of the invention〕

According to the present invention, the intermediate gear meshing with the gear portion provided on the inner circumferential surface of the driven rotor and the clutch gear meshing with the intermediate gear constitute a so-called speed increasing mechanism. A clutch plate, which rotates integrally with the main drive rotor, is brought into pressure contact with the disc part of the clutch gear, which is the speed increasing end of the main drive rotor, to obtain clutch force.This clutch force prevents the rotation of the intermediate gear during antenna expansion and contraction, and the main drive Since the driving force of the rotating body is directly transmitted to the driven rotating body through the intermediate gear that is prevented from rotating, the driving force is accurately transmitted from the motor side to the antenna side. Needless to say, it is possible to provide a clutch device for an electric telescopic antenna in which the pressure contact force of the clutch portion is small, the device can be made compact, and the sliding sound of the clutch portion is small when the antenna extension/retraction operation is completed, and the noise is extremely low.

[Brief explanation of the drawing]

1 to 5 are views showing one embodiment of the present invention, in which FIG. 1 is an external perspective view showing the entire clutch device, FIG. 2 is a vertical sectional view, FIG. 3 is an exploded perspective view, and FIG.
The figure is a partial perspective view with a portion cut away, and FIG. 5 is a diagram showing the relationship of rotational force of each part. 1... Main shaft, 2... Main drive rotating body, 3... Gear part, 4... Intermediate gear, 5... Clutch gear, 6,
7... First and second clutch plates, 8, 9... Spacers, 10, 11... Cut grooves, 12a to 12c...
... Coil spring, 13 ... Driven rotating body, 14
a to 14c and 15a to 15c...protrusions, 16
... Gear part, 17 ... Push nut, 18 ...
Cap.

Claims (1)

[Claims] 1 A main shaft, a main rotating body that is fitted into the main shaft and rotates in response to driving force from a motor, and a main rotating body that is rotatably provided on one side of the main shaft with an axis different from that of the main shaft. It has an intermediate gear in one part, a gear part that meshes with the intermediate gear, and a clutch disc part in the other part, and is fitted into the main shaft so as to be rotatable relative to the main drive rotating body. A clutch gear, a clutch plate fitted into the main shaft so as to rotate together with the main drive rotating body while in contact with a disk portion of the clutch gear, and pressure contact means for pressing the clutch plate against the disk portion of the clutch gear at a predetermined pressure. , having a gear portion meshing with the intermediate gear on an inner circumferential surface thereof, and being fitted into the main shaft so as to be rotatable relative to the main drive rotating body, and applying a driving force transmitted from the main drive rotating body to the telescopic antenna. 1. A clutch device for an electric telescoping antenna, characterized in that it comprises a driven rotating body provided as shown in FIG.