JPH0332836Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a telescopic fitting tube driving device, and more particularly, to a telescopic fitting tube driving device for driving the contraction and extension of a telescopic fitting tube.

BACKGROUND ART Conventionally, for example, there are systems in which a telescopic fitting tube is used as an antenna or a corner pole of an automobile, and the antenna or corner pole is moved up and down by driving the telescopic fitting tube electrically.

The conventional telescopic fitting tube drive device described above transmits the rotation of a worm gear provided on a motor rotating shaft to a helical gear, and uses a plurality of spur gears to reduce the rotation of the helical gear and transmits the rotation to a pulley. A flexible tube is wrapped around the pulley. One end of this tube is fixed to a pulley, and the other end is fixed to the tip of the telescopic fitting tube. When the pulley rotates and the tube is wound up, the telescopic fitting tube is shortened, and when the pulley rotates in the opposite direction and the tube is fed out, the telescopic fitting tube is expanded.

Problems to be Solved by the Invention The telescopic fitting tube drive device described above requires many spur gears in order to increase the reduction ratio. As described above, there are problems such as poor transmission efficiency due to the large number of gears, poor assembly workability due to the large number of parts, and difficulty in downsizing.

Therefore, an object of the present invention is to provide a telescopic tube drive device that solves the above problems by using a speed reduction mechanism using a planetary gear mechanism.

Means for Solving the Problems In the present invention, the rotation of the sun gear driven by a motor causes the planetary gear meshed with the sun gear and the internal fixed gear to revolve, and the difference in the number of teeth with respect to the fixed gear. A planetary gear is meshed with an internally toothed driven gear, and a fixed gear is pressed against the case by a spring member and fixed by friction, and a speed reduction mechanism is provided to slow down and rotate the driven gear according to the difference in the number of teeth. The slip torque of the friction between the gear and the case is set to be smaller than the torque of the motor and larger than the torque of the driven gear required to drive the telescopic fitting tube, and winding is performed according to the rotation of the driven gear. Rotate the part.

Function: In this invention, a large reduction ratio can be obtained with a small number of gears, such as a sun gear, a planetary gear, a fixed gear, and a driven gear.
It is easy to assemble and can be made smaller, and when a large load is applied to the telescopic fitting tube, there is no risk of damage to the motor due to rotation of the fixed gear due to rotation of the motor, and the telescopic fitting can be done manually. It becomes possible to extend and contract the tube.

Embodiment FIG. 1 shows a sectional view of an embodiment of the device of the present invention, and FIG. 2 shows a plan view thereof.

In FIGS. 1 and 2, reference numeral 1 denotes a motor, which is fixed to a plate 2, and this plate 2 is fixed to a case 3. Rotating shaft 2a of motor 1
A sun gear 4 is fixed to , and is rotated clockwise or counterclockwise by the drive of the motor 1 . For example, the number of teeth provided on the outer periphery of the sun gear 4 is "36".
It is.

Planetary gears 5, 6, and 7 are meshed with the outer periphery of the sun gear 4, respectively. The number of teeth of each of the planetary gears 5, 6, and 7 is, for example, 32.

Each of the planetary gears 5, 6, and 7 meshes with a fixed gear 8 and a driven gear 9, which are internal gears. The fixed gear 8 and the driven gear 9 are made to have the same distance between their axes as the planetary gears 5, 6, and 7 through displacement, respectively.

The fixed gear 8 is ring-shaped and has, for example, 102 teeth. The fixed gear 8 is located at the stepped portion 3a of the case 3.
The movement in the direction of arrow A is regulated by engaging with.
Further, a wavy spring 11 is provided between the fixed gear 8 and the case 10 fixed to the case 3, and the fixed gear 8 is moved by the arrow indicated by the wavy spring 11.
It is urged in the direction and pressed against the step portion 3a of the case 3, and is fixed to the case 3 by friction.

The driven gear 9 is ring-shaped, has a substantially U-shaped cross section, and has, for example, 99 teeth. The driven gear 9 is rotatably engaged with the fixed gear 8. Groove 9a (winding part) with U-shaped cross section of driven gear 9
A flexible tube 12 made of resin such as nylon is inserted into the tube and is wrapped around the driven gear 9. A fixing member 9b is provided in a part of the groove 9a as shown in FIG.
One end 12a of is fixed to the fixing member 9b. The flexible tube 12 is wound around the driven gear 9 approximately twice, for example, and the other end 12b is guided into the telescopic fitting tube 13 and fixed to the tip of the telescopic fitting tube 13. The base 13a of this telescopic fitting tube 13 is connected to the case 3.
is fixed.

Here, when the motor 1 is driven and the sun gear 4 rotates clockwise in FIG. 2, the planetary gears 5, 6, and 7 rotate counterclockwise. Each of the planetary gears 5, 6, and 7 is fitted into a fixed gear 8 and a driven gear 9 having different numbers of teeth, and the fixed gear 8 is fixed to the case 3 by friction. Therefore, the driven gear 9 rotates clockwise relative to the fixed gear 8 due to the difference in the number of teeth (the difference in the number of teeth between the driven gear 9 and the fixed gear 8). At this time, the rotational reduction ratio of the driven gear 9 to the sun gear 4 is "127.5". By the clockwise rotation of the driven gear 9, the flexible tube 12 is sent out from the groove 9a of the driven gear 9, and the other end of the flexible tube 12 is connected to the telescopic fitting tube 13.
, and the telescopic fitting tube 13 is extended.

Conversely, when the sun gear 4 is rotated counterclockwise by the motor 1, the driven gear 9 rotates counterclockwise with respect to the fixed gear 8 due to the difference in the number of teeth between the driven gear 9 and the fixed gear 8. This allows the flexible tube 12
is wound around the groove 9a of the driven gear 9, the tip of the telescopic fitting tube 13 is pulled down, and the telescopic fitting tube 13 is shortened.

By the way, the slip torque of the friction between the fixed gear 8 and the case 3 caused by the wave spring 11 is W _T , the torque of the driven gear 9 required to extend and contract the telescopic fitting tube 13 is P _T , and the driven gear 9 is Let M _T be the torque of motor 1 required to rotate it. At this time, the wavy spring 11 is selected so as to satisfy the following equation.

M _T > W _T > P _T Therefore, a large load is applied to the telescopic fitting tube 13, and even if the driven gear 9 stops rotating even though the motor 1 is rotating, the fixed gear 8 continues to rotate. .
Therefore, the rotation of the motor 1 does not stop, and there is no risk that the motor 1 will generate heat and be damaged. Further, even when the rotation of the motor 1 is stopped, the telescopic fitting tube 13 can be manually extended and contracted.

In this way, the sun gear 4, the planetary gears 5, 6,
A large reduction ratio can be obtained with a small number of gears (7, fixed gear 8, and driven gear 9), and because the number of gears is small, transmission efficiency is improved, assembly workability is good, and downsizing is possible. .

Note that a wire or the like may be used instead of the flexible tube as the flexible member, and the driven gear 9
The winding portion and the wrapping portion may be separate bodies, and are not limited to the above embodiment.

Effects of the invention As mentioned above, the telescopic fitting tube drive device of the present invention has a small number of gears, can obtain a large reduction ratio, has good transmission efficiency, is easy to assemble, and can be made smaller. Further, it has features such as eliminating the risk of damage to the motor and allowing the telescopic fitting tube to be manually extended and contracted.

[Brief explanation of drawings]

Fig. 1 is a sectional view of one embodiment of the device of the present invention;
The figure is a plan view of the device shown in the first figure with the case removed. 1... Motor, 3, 10... Case, 4... Sun gear, 5, 6, 7... Planetary gear, 8... Fixed gear, 9... Driven gear, 9a... Groove (winding part), 1
2... Flexible tube, 13... Telescopic fitting tube.

Claims (1)

[Claims for Utility Model Registration] A flexible member whose end is connected to a telescopic fitting tube is wound around a winding part, and the winding part is rotated to wind up or send out the flexible member. In a telescopic fitting tube drive device that shortens or extends the telescopic fitting tube whose base is fixed to the case, the rotation of the sun gear driven by the motor causes the sun gear and the internally toothed fixed gear to The meshed planetary gears are caused to revolve, and the planetary gears are meshed with a driven gear having internal teeth having a difference in the number of teeth with respect to the fixed gear, and the fixed gear is pressed against the case by a spring member to generate friction. the fixed gear and a speed reduction mechanism that slows down and rotates the driven gear according to the difference in the number of teeth, the slip torque of friction between the fixed gear and the case is smaller than the torque of the motor, and the telescopic fitting tube A telescopic fitting tube drive device that is set to have a torque greater than the torque of the driven gear necessary to drive the driven gear, and rotates the winding portion in accordance with the rotation of the driven gear.