JPS646564Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is an automotive antenna drive cord winding device in which a worm wheel that engages with a worm of a motor shaft, a clutch, and an external gear that engages with a planetary gear are assembled together on an intermediate shaft. This invention relates to a structure in which the intermediate shaft is rotatably attached to a support shaft attached to a case.

Conventional winding devices for automotive antenna drive cords have the disadvantage that each component is assembled one by one in sequence, so all assembly has to be done in one place. The drawback was that in order to find out whether or not it was, the whole thing had to be disassembled and reassembled.

The present invention is an automotive antenna drive cord winding device proposed to eliminate the above-mentioned drawbacks. That is, the present invention has a support shaft fixed to a case, a worm wheel for engaging the worm of a reversible motor is loosely fitted to one end of the support shaft, and the stop ring is fitted into the circumferential groove of the intermediate shaft. The outer periphery of the worm wheel is covered with a stop ring restraining part on the inner periphery of the worm wheel, and the clutch is pressed against the worm wheel by a pressure spring and fitted so as to be able to reciprocate in the axial direction. This is an antenna drive cord winding device for an automobile, which is equipped with an intermediate shaft that is rotatably inserted. This can be explained with reference to the drawings as follows.

In the accompanying drawings, reference numeral 1 denotes a case formed in a concave shape, and a reversible motor 2 is attached to the inner side of a protrusion that bulges out from the axis of the case 1. , the worm 4 is fixed on its axis, and the worm wheel 5 is engaged with the worm 4.

Pressure spring 16 and clutch wheel 1 on intermediate shaft 7
7 and the through-hole portion of the worm wheel 5 are sequentially inserted into the rotating screw shaft 7 from above, and the stop ring 18 is fitted into the circumferential groove 7' provided in the intermediate shaft 7, and the stop ring suppressing portion 5' of the worm wheel 5 is inserted. is placed over the outer periphery of the stop ring 18 to restrain it, and presses the intermediate shaft 7 with the pressing spring 16 and the clutch wheel 1.
7. By integrally combining the worm wheel 5, assembly work and failure detection are facilitated.
There is no need for complete disassembly and reassembly as in the past. The intermediate shaft 7, in which each member is connected as described above, is
The worm wheel 5 is rotatably attached to a support shaft 6 provided on the case 1 and engaged with the worm 4.

A cylindrical protrusion 8 is provided below the intermediate shaft 7, an external toothed portion 9 is provided on this protrusion 8, and the external toothed portion 9 is provided with protrusions 13, 13 that protrude above the rotating drum 12.
The teeth 15, 15 of the planetary gears 14, 14 supported so as to rotate are engaged with each other, and the housing 1
Internal teeth 11 carved on the inner periphery of a cylindrical portion 10 protruding from the lower surface of the bottom wall of the cylindrical gear are formed so as to engage with the teeth 15 of the planetary gears 14, 14 to perform two-step deceleration. Then, the bottom surface of the worm wheel 5,
It is formed to come into elastic contact with the upper surface of the clutch wheel 17.

The lower protrusion of the collar is inserted so as to rotate the intermediate shaft 7 into the through hole bored in the bottom wall of the case 1, and the upper part of the support shaft 6 that supports the intermediate shaft 7 is placed above the case 1. The case 1 protrudes upward from a through hole drilled in the upper concave portion of the case 1, and is caulked or a screw is inserted into a female thread provided above the support shaft 6, and a screw is inserted into the female thread provided above the support shaft 6. is supported on the case 1, and a lower cover 20 provided below the support shaft 6 is provided below the case 1.
The male screw 21 of the protrusion protrudes downward from the through hole.
Attach the support shaft 6 to the casing 1 by screwing the nut 22 into the housing 1.

A longitudinally long storage chamber 2 is provided on the outer periphery of the rotating drum 12.
3 is provided, and the antenna drive cord 25 connected to the antenna 24 is wound and stored in the storage chamber 23 in a winding shape, or is let out. 26 in the diagram
27 is a plug connected to the power supply circuit, 27 is a plug connected to the receiver, 28 is an antenna housing tube, 29 is a cord connected to the rotor side of the reversible motor 2, and 30 is connected to the fixed side of the reversible motor 2. The power supply circuit for the reversible motor 2 is opened and closed using a switch (not shown) installed in the vehicle.

Since the present invention is configured as described above, in order to house the antenna 24 in the antenna housing tube 28 and wind up the antenna drive cord 25 connected thereto in the housing chamber 23, the reversible motor 2 must be rotated in the forward direction. ,
Due to this forward rotation, the rotating shaft 3 of the reversible motor 2,
By interlockingly rotating the worm 4 and the worm wheel 5 that engages the worm 4, and further interlockingly rotating the intermediate shaft 7 attached to the worm wheel 5, a cylindrical shaft provided below the intermediate shaft 7 is rotated. The external teeth 9 of the protrusion 8 are connected to the protrusion 1 of the rotating drum 12.
3 and 13 planetary gears 14 and 14,
The rotary drum 12 is rotated at a speed reduced by two steps, and the antenna drive cord 25 is wound up and stored in the storage chamber 23, and the antenna 24 is stored in the antenna storage cylinder 28. antenna 24
After winding up the antenna drive cord 25, open the switch installed inside the car to open the power supply circuit, and connect the antenna 24 and antenna drive cord 2.
This is to maintain the accommodation state with 5. Also, the antenna drive cord 25 wound up in the storage chamber 23
In order to feed out the antenna 24 housed in the antenna housing cylinder 28, the reversible motor 2 is rotated in the opposite direction, and this reverse rotation causes the rotating shaft 3, the worm 4, the worm wheel 5, the intermediate shaft 7, and the planetary gear 1
4 and 14, and at the same time rotate the rotating drum 12 in the reverse direction, the antenna drive cord 2
5 from the housing chamber 23, the antenna 24 is pulled out from the antenna housing cylinder 28, and the antenna 24 and the antenna drive cord 2
In order to maintain the extended state of the antenna 24 and the antenna drive cord 25, a switch provided in the vehicle is opened to open the power supply circuit, thereby maintaining the extended state of both the antenna 24 and the antenna drive cord 25.

Since the present invention is as described above, the antenna 24
and antenna drive cord 25, or
Feeding out can be performed accurately by forward and reverse rotation of the reversible motor 2, and the worm 4 of the rotating shaft 3 of the reversible motor 2 is engaged with the worm wheel 5 of a larger diameter to perform one step deceleration, and the worm wheel 5 is further decelerated. The external gear 9 of the cylindrical protrusion 8 of the intermediate shaft 7 that has been attached in advance is connected to the planetary gear 1 of the rotating drum 12.
4, 14, and the planetary gears 14, 1
By engaging the inner teeth 11 of the cylindrical portion 10 provided in the case 1 with the inner teeth 11 of the cylindrical portion 10 provided in the case 1, the rotational speed of the rotating drum 12 is reduced in two steps, and the rapid winding of the antenna 24 and the antenna drive cord 25 is achieved. Alternatively, it is possible to prevent vibrations caused by rapid feeding, and to prevent failures of various parts due to vibrations. In addition, in the present invention, a worm wheel is provided at one end of the intermediate shaft to engage the worm of the reversible motor, and the worm wheel is locked with a stop ring, and a clutch wheel is arranged below the worm wheel, and the clutch wheel is pressed toward the worm wheel. Since the worm wheel is pressed to prevent a load higher than the appropriate torque from being applied to the worm wheel, it will not be damaged unless the worm wheel is pushed once it is assembled, and it can be easily disassembled by pushing the worm wheel. . Moreover, the outer circumference of the stop ring is covered with the inner circumference of the stop ring suppressing part of the worm wheel to prevent the stop ring from being expanded due to the elasticity of the pressing spring, thereby preventing the two-stage reduction. It is possible to convert the small rotational force of a small motor into a large rotational force, and the entire product is small and lightweight, with great durability, and the finished product is about half the volume of the conventional product, making it suitable for the energy saving era and surpassing the conventional one. can be provided at a lower price.

[Brief explanation of the drawing]

Fig. 1 is an enlarged plan view of the present invention with a part cut away, Fig. 2 is a cross-sectional side view of the drive unit, and Fig. 3 is a compositional member incorporating a pressing spring, a clutch wheel, and a worm wheel in an intermediate shaft. FIG. 1... Case, 2... Reversible motor, 3... Rotating shaft, 4... Worm, 5... Worm wheel,
6... Support shaft, 7... Intermediate shaft, 8... Cylindrical protrusion, 9... External teeth, 10... Cylindrical part, 11... Internal teeth, 12... Rotating drum, 13... protrusion, 14
... Planet gear, 15 ... Planet gear teeth, 16 ...
Pressure spring, 17...Clutch wheel, 18...
Stop spring, 23...Containment chamber, 24...Antenna, 25...Antenna drive code.

Claims (1)

[Scope of utility model registration request] It has a support shaft 6 fixed to the case 1, and a planetary gear 14 that is loosely fitted to the support shaft 1 within the case 1 and meshes with the external teeth 9 of the intermediate shaft 7 and the internal teeth 11 of the case 1. Rotating drum 12 loosely fitted to support shaft 1 and rotating drum 1
A worm wheel pressing spring 16 is provided with an external toothed portion 9 that is loosely fitted onto the support shaft 1 and meshes with the planetary gear 14 overlapping with the worm wheel 2.
an intermediate shaft 7 provided with a pedestal; a clutch wheel 17 which is loosely fitted onto the intermediate shaft 7 and is disposed so as to be elastically pressed against the worm wheel 5 by the worm wheel pressing spring 16 so as to be in surface contact with the worm wheel 5; The worm wheel 5 is fitted onto the intermediate shaft 7 and provided with a stop ring restraining part 5', and the outer circumferential surface of the worm wheel 5 is restrained by the stop ring restraining part 5', and the worm wheel 5 is fitted into the circumferential groove 7' of the intermediate shaft 7. An antenna drive cord winding device comprising a stop ring 18.