JPH077311A - Motor driven antenna driving device - Google Patents

Abstract

PURPOSE:To miniaturize the device by arranging the sequence of gears so that one part of the peripheral part of the large gear of a deceleration gear can be inserted into a gap part between the main gear and slave gear of a clutch. CONSTITUTION:The revolution of a motor 11 is transmitted through a worm gear 12, worm wheel 13, small gear 14, large gear 17 and small gear 18 to a main gear 21 of a clutch 20, further, a slave gear 23 is revolved through a clutch element 25, and an antenna is stretched and driven through a driving rope 26 with rack to be engaged with this slave gear. In this case, a distance between gear shafts is shortened by arranging the sequence of gears so that one part of the peripheral part of the large gear 17 can be inserted into a gap G between the main gear 21 and the slave gear 23. On the other hand, the motor 11 is also miniaturized by multi-stage deceleration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric antenna driving apparatus suitable for driving, for example, an electric antenna for an automobile, and more particularly to a reduction gear mechanism interposed between a rotating shaft of a motor and a clutch. Regarding the improvement of the layout.

[0002]

2. Description of the Related Art FIG. 5 is a diagram showing a structure of a reduction gear mechanism in a conventional electric antenna driving apparatus of this type. As shown in FIG. 5, a worm gear 12 is provided on the rotating shaft of the electric motor 11, and a worm wheel 13 is meshed with the worm gear 12. The worm wheel 13 is integrally provided with a small gear 14, and together with the worm wheel 13 constitutes a two-stage reduction gear 15. An intermediate gear 16 is meshed with the small gear 14,
The main gear 21 of the clutch 20 meshes with the intermediate gear 16. The intermediate gear 16 is a rotation transmission dedicated gear that simply transmits the rotational force to the next gear.

The clutch 20 has a main driving side rotating base 22 having a main driving gear 21 formed on an outer peripheral portion thereof, and the main driving side rotating base 2.
2 is arranged concentrically adjacent to the driven gear 23 on the outer periphery.
Driven side rotating base body 24 and driving side rotating base body 2
The clutch element 25 is interposed between the driven-side rotary base 24 and the driven-side rotary base 24 and frictionally transmits the rotational force of the drive-side rotary base 22 to the driven-side rotary base 24.

The driven gear 23 receives the rotational force from the driven gear 23, is transferred in the longitudinal direction (direction perpendicular to the paper surface), and is provided with a rack-equipped drive rope 26 provided to extend and retract an antenna (not shown). The rack portion 26a of is engaged.

[0005]

SUMMARY OF THE INVENTION The conventional electric antenna driving apparatus described above has a two-stage reduction gear 15 and a clutch 20.
Intermediate gear 1 for the purpose of transmitting torque only between
Since 6 is interposed, there is a drawback that a large reduction gear ratio cannot be obtained even though the drive device is relatively large. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an electric antenna drive device which is small in size, can obtain a required reduction ratio, has a simple structure, and can be manufactured at low cost.

[0006]

In order to solve the above problems and achieve the object, the following measures were taken in the present invention. (1) The electric antenna drive device of the present invention includes an electric motor, a reduction gear mechanism provided to reduce and transmit the rotation of the electric motor, and a main driving gear that meshes with an output pinion of the reduction gear mechanism. And a driven-side rotating base having an outer peripheral portion, and a driven-side rotating base having a driven gear that rotates by transmitting a rotational force of the driving-side rotating base through a clutch element. A drive rope with a rack is provided which receives a rotational force from a driven gear of the base body and is transferred in the longitudinal direction to extend and retract the antenna.

The reduction gear mechanism includes a front / two-stage reduction gear and a front / two-stage reduction gear consisting of a worm wheel meshing with a worm gear provided on a rotary shaft of an electric motor and a small gear integrated with the worm wheel. It consists of a combination of a rear / two-stage reduction gear coupled to the rear stage of the reduction gear, and a part of the peripheral portion of the large gear of the rear / two-stage reduction gear is located between the main gear and the driven gear in the clutch. The small gear of the rear / two-stage reduction gear is arranged so as to mesh with the main driving gear while being inserted in the existing gap.

(2) In the above drive device, the reduction gear mechanism is composed of a two-stage reduction gear consisting of a worm wheel meshing with a worm gear provided on the rotating shaft of the electric motor and a small gear integrated with the worm wheel. In the state where a part of the peripheral portion of the worm wheel, which is the large gear of the two-step reduction gear, is inserted in the gap portion existing between the main driving gear and the driven gear in the clutch,
The small gear of the two-stage reduction gear is arranged so as to mesh with the main driving gear.

[0009]

As a result of taking the above-mentioned means, the following effects occur. (1) The reduction gear mechanism consists of a worm wheel that meshes with a worm gear provided on the rotating shaft of the electric motor, a front / two-stage reduction gear consisting of a small gear integrated with this worm wheel, and this front / two-stage reduction gear. In the case of a combination of a rear / two-stage reduction gear coupled to the rear stage, the large gear of the rear / two-stage reduction gear is inserted in the gap portion existing between the main gear and the driven gear of the clutch, In addition, the small gear of the rear / two-stage reduction gear is in a state of meshing with the main driving gear of the clutch. Therefore, the rotational force of the electric motor is combined with a two-stage reduction gear consisting of a worm wheel that meshes with a worm gear provided on the rotary shaft of the electric motor and a small gear integrated with the worm wheel, and an intermediate gear dedicated to rotation transmission. Compared with the conventional one configured to transmit to the main gear of the clutch via the reduction gear mechanism, the amount of the large gear of the above-mentioned second-stage and second-stage reduction gears is set in the gap portion. The distance between the gears can be reduced by a corresponding distance. Moreover, the gear reduction ratio is increased by the amount that the intermediate gear dedicated to rotation transmission is replaced with the two-stage reduction gear. Thus, the size of the electric motor can be reduced.

(2) When the reduction gear mechanism is formed of only a two-stage reduction gear consisting of a worm wheel meshing with a worm gear provided on the rotating shaft of the electric motor and a small gear integrated with the worm wheel, The large gear of the two-stage reduction gear, that is, the worm wheel is inserted in the gap portion existing between the main gear and the driven gear of the clutch, and the small gear integrated with the worm wheel is the main gear of the clutch. Presents a state of meshing. Therefore, a two-stage reduction gear consisting of a worm wheel that meshes the rotational force of the electric motor with a worm gear provided on the rotary shaft of the electric motor and a small gear integrated with the worm wheel,
Compared to the conventional one configured to transmit to the main driving gear of the clutch through the reduction gear mechanism that is formed by combination with the intermediate gear dedicated to rotation transmission, the distance between the gears is increased by a distance corresponding to the diameter of the intermediate gear. The distance can be shortened. However, in this case, the gear reduction ratio is substantially the same as the conventional one.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS "First Embodiment" FIGS. 1 and 2 are views showing the configuration of an electric antenna driving device according to a first embodiment in which the present invention is applied to an electric antenna driving device for automobiles. 1 is a front view showing the configuration of the entire apparatus with a case lid removed, and FIG. 2 is a side view showing the configuration of a reduction gear mechanism.

As shown in FIG. 1, this electric antenna driving apparatus includes an electric motor 11 inside a case 10, a reduction gear mechanism S provided for decelerating and transmitting the rotation of the electric motor 11, and the reduction gear. A clutch 20 provided so that the rotational force applied from the gear mechanism S is received by the driving gear and transmitted to the driven gear via the clutch element 25, and the rotational force output from the driven gear of the clutch 20. The drive rope 26 with a rack which is received and transferred in the longitudinal direction thereof so as to extend and retract an antenna (not shown).
It has and. In FIG. 1, 27 is a relay board, 28 is a power cord connecting portion, and 29 is a rope back surface pressing roller.

As shown in FIG. 2, the reduction gear mechanism S is
Is a front-stage / two-stage reduction gear 15 including a worm wheel 13 meshing with a worm gear 12 provided on the rotary shaft of the electric motor 11 and a small gear 14 integrated with the worm wheel 13, and the front-stage / two-stage reduction gear. 15, a large gear 17 that is arranged so as to be coupled to the latter stage of the gear 15 and that meshes with the small gear 14, and a small gear 18 that is integrated with the large gear 17.
It is configured by a combination with a rear / two-stage reduction gear 19 consisting of. A part of the peripheral portion of the large gear 17 of the rear / two-stage reduction gear 19 described above is inserted inside the gap G existing between the main driving gear 21 and the driven gear 23 in the clutch 20 described below. In this state, the small gear 18 of the rear / two-stage reduction gear 19 is arranged so as to mesh with the main driving gear 21 of the clutch 20.

The clutch 20 is concentrically arranged adjacent to the main driving side rotating base 22 and a main driving side rotating base 22 having a main driving gear 21 formed on the outer peripheral part thereof.
A driven side rotating base body 24 formed with 3 and a clutch element which is interposed between the driving side rotating base body 22 and the driven side rotating base body 24 and frictionally transmits the rotational force of the driving side rotating base body 22 to the driven side rotating base body 24. It consists of 25. As the clutch element 25, for example, a four-bar linkage mechanism is used, as schematically shown in FIG. A clutch using this four-bar linkage as the clutch element 25 is
The applicant of the present application has already filed “Japanese Patent Application No. 05-119762”, and is a clutch characterized by being small and having low noise. The driven gear 23 of the clutch 20 is meshed with the rack portion 26a of the drive rope 26 with a rack for extending and retracting the antenna.

Next, the operation and effect of the present embodiment configured as described above will be described with reference to FIGS. 4A and 4B as appropriate. The reduction gear mechanism S in the present embodiment includes a front / two-stage reduction gear 15 including a worm wheel 13 meshing with a worm gear 12 provided on a rotating shaft of an electric motor 11 and a small gear 14 integrated with the worm wheel 13. ,
The front / two-stage reduction gear 15 is combined with the rear / two-stage reduction gear 19 arranged so as to be coupled to the rear stage. Therefore, as shown in FIG. 4A, a part of the peripheral portion of the large gear 17 of the rear / two-stage reduction gear 19 described above is
The small gear 18 of the rear / two-stage reduction gear 19 is inserted into the gap G existing between the main driving gear 21 and the driven gear 23 of the clutch 20 and is the main driving gear 2 of the clutch 20.
It is in a state of meshing with 1. Therefore, (b) of FIG.
A conventional two-stage reduction gear consisting of a worm wheel 13 that meshes the rotational force of the electric motor 11 with a worm gear 12 provided on the rotary shaft of the electric motor 11 and a small gear 14 integrated with the worm wheel 13. 15
And a large gear of the rear / two-stage reduction gear 19 described above, as compared with a transmission gear configured to transmit to the main driving gear 21 of the clutch 20 through a reduction gear mechanism that is a combination of the intermediate gear 16 dedicated to rotation transmission. The distance between the gears is reduced by a distance L1 corresponding to the amount of 17 inserted into the gap G. Moreover, the intermediate gear 1 dedicated to rotation transmission
Since 6 is replaced with the two-stage reduction gear 19, the gear reduction ratio is expanded accordingly. Thus, the electric motor 11 may be small.

[Second Embodiment] FIG. 3 is a side view showing the structure of a reduction gear mechanism in an antenna drive apparatus according to a second embodiment in which the present invention is applied to an electric antenna drive apparatus for an automobile. In this embodiment, as the reduction gear mechanism S, a two-stage reduction gear 33 including a worm wheel 31 meshing with a worm gear 12 provided on the rotating shaft of the electric motor 11 and a small gear 32 integrated with the worm wheel 31.
A part of the peripheral portion of the worm wheel 31, which is a large gear of the two-step reduction gear 33, is inserted into a gap G existing between the main driving gear 21 and the driven gear 23 of the clutch 20. In this state, the small gear 32 is arranged so as to mesh with the main driving gear 21.

In the second embodiment, FIG.
As shown in FIG. 5, the reduction gear mechanism S includes only the two-stage reduction gear 33 including the worm wheel 31 meshing with the worm gear 12 provided on the rotary shaft of the electric motor 11 and the small gear 32 integrated with the worm wheel 31. Has been formed. Therefore, the large gear of the two-stage reduction gear 33, that is, the worm wheel 31 is the main gear 21 of the clutch 20.
The small gear 32, which is inserted in the gap G existing between the driven gear and the driven gear, and which is integrated with the worm wheel 31, engages with the main gear 21 of the clutch 20. Therefore, the conventional one shown in FIG. 4D, that is, the worm wheel 13 that meshes the rotational force of the electric motor 11 with the worm gear 12 provided on the rotating shaft of the electric motor 11 and the small worm wheel 13 integrated with the worm wheel 13. Gear 1
Compared with a structure configured to transmit to the main driving gear 21 of the clutch 20 through a reduction gear mechanism formed by a combination of a two-stage reduction gear 15 composed of 4 and an intermediate gear 16 dedicated to rotation transmission, the intermediate gear described above is generally used. The distance between the gears can be shortened by the distance L2 corresponding to the diameter of 16. However, in the case of this embodiment, the gear reduction ratio is substantially the same as the conventional one. 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.

[0018]

According to the present invention, the following operational effects can be obtained. If the reduction gear mechanism is a combination of a front / two-stage reduction gear consisting of a worm wheel and a small gear integrated with this worm wheel, and a rear / two-stage reduction gear connected to the latter stage, A state in which the large gear of the rear / two-stage reduction gear is inserted in the gap existing between the main gear and the driven gear of the clutch, and the small gear of the rear / two-stage reduction gear meshes with the main gear of the clutch. Present. Therefore, the rotational force of the electric motor is transmitted to the clutch through a reduction gear mechanism that is a combination of a two-stage reduction gear consisting of a worm wheel and a small gear integrated with the worm wheel, and an intermediate gear dedicated to rotation transmission. Compared with the conventional gear configured to transmit to the gears, the distance between the gears is reduced by a distance corresponding to the amount of the large gear of the rear / two-stage reduction gear described above being inserted into the gap. Can be shortened. Moreover, since the gear reduction ratio is expanded by the amount that the intermediate gear dedicated to rotation transmission is replaced by the two-stage reduction gear, the size of the electric motor can be reduced.

When the reduction gear mechanism is formed of only a two-stage reduction gear consisting of a worm wheel and a small gear integrated with the worm wheel, the large gear of the two-stage reduction gear, that is, the worm wheel is the clutch. Inserted in the gap existing between the main gear and the driven gear,
Further, the small gear integrated with the worm wheel is in a state of meshing with the main driving gear of the clutch. Therefore, the rotational force of the electric motor is transmitted through the reduction gear mechanism that is a combination of a two-step reduction gear consisting of a worm wheel and a small gear integrated with the worm wheel, and an intermediate gear dedicated to rotation transmission, to the main gear of the clutch. The distance between the gears can be shortened by a distance corresponding to the diameter of the intermediate gear, as compared with the conventional one configured to transmit to the gear. However, in this case, the gear reduction ratio is substantially the same as the conventional one. Thus, according to the present invention, it is possible to provide an electric antenna driving device which is small in size, has a required reduction ratio, has a simple structure, and can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a front view showing a configuration of an electric antenna driving device according to a first embodiment of the present invention with a case lid removed.

FIG. 2 is a side view showing the configuration of a reduction gear mechanism of the electric antenna driving device according to the first embodiment.

FIG. 3 is a side view showing the configuration of the reduction gear mechanism of the electric antenna driving device according to the second embodiment of the present invention.

4 (a), (b) and (c) (d) are views for explaining the operation of the electric antenna driving device according to the first embodiment and the second embodiment of the present invention, respectively.

FIG. 5 is a side view showing a configuration of a reduction gear mechanism of an electric antenna driving device according to a conventional example.

[Explanation of symbols]

10 ... Case 11 ... Electric motor 12 ...
Worm gear 13, 31 ... Worm wheel 14,
18, 32 ... Small gear 15 ... Pre-stage / two-stage reduction gear 16 ... Intermediate gear 17 ...
Large gear 19 ... Rear / two-stage reduction gear 20 ... Clutch 21 ...
Driving gear 22 ... Driving side rotation base 24 ... Driving side rotation base
23 ... Driven gear 25 ... Clutch element 26 ... Drive rope with rack S ... Reduction gear mechanism G ... Gap

Claims (2)

[Claims] 1. A drive-side rotating base having an electric motor, a reduction gear mechanism provided so as to reduce and transmit the rotation of the electric motor, and a main driving gear that meshes with an output pinion of the reduction gear mechanism on an outer peripheral portion, The rotational force of the driven-side rotary base is transmitted from the driven-side rotary base via a clutch element, and the driven-side rotary base has a driven gear that rotates on its outer peripheral portion. A drive rope with a rack that is received and transferred in the longitudinal direction and that is configured to drive the antenna to expand and contract. A combination of a front-stage and two-stage reduction gear consisting of small gears integrated in the rear gear and a rear-stage and two-stage reduction gear connected to the rear stage of this front-stage and two-stage reduction gear. And a part of the peripheral portion of the large gear of the second-stage and second-stage reduction gear is inserted in the gap portion existing between the main gear and the driven gear of the clutch, and the rear-stage two gear is formed. An electric antenna driving device, wherein a small gear of a step reduction gear is arranged so as to mesh with the main driving gear. 2. A reduction gear mechanism comprises a two-stage reduction gear consisting of a worm wheel meshing with a worm gear provided on a rotary shaft of an electric motor and a small gear integrated with the worm wheel. A part of the peripheral portion of the worm wheel, which is a large gear of the gear, is inserted in a gap portion existing between the main driving gear and the driven gear of the clutch, and the small gear of the two-stage reduction gear is The electric antenna driving device according to claim 1, wherein the electric antenna driving device is arranged so as to mesh with the main driving gear.