JP2644968B2 - Clutch structure of telescopic pole mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telescopic pole mechanism used as a corner pole of a motor vehicle or a telescopic antenna.

[0002]

2. Description of the Related Art Heretofore, a device has been put to practical use in which the power of a motor is transmitted to a rotary drum, and a drive cord is fed and wound by the rotary drum to extend and retract a pole.

[0003] As such a device, a corner pole or an antenna for an automobile is known.
No. 640, No. 62-158908, No. 63-1558
No. 52, No. 63-155853, Japanese Patent Application No. 63-168
No. 153, for example.

By the way, in such a conventional device,
As disclosed in the above publication, the power of the motor is transmitted to the rotating drum via a reduction gear train including a clutch wheel.

FIGS. 6 (a) and 7 (a) show the clutch wheel, and reference numerals 2 'and 2 "in the drawings denote rings having spring properties.

[0006] A clutch wheel 1 'of the type shown in Fig. 6 (a) has a circular shape, and a ring 2' of the same shape is pressed against a peripheral surface 1a '.

The rotation of the ring 2 is restricted by the pawls 2a 'and 2b' projecting from the ring 2 'being locked to a part of the device, so that the clutch wheel 1' Rotates while contacting the ring 2 '.

On the other hand, a clutch wheel 1 "of the type shown in FIG. 7A has a flat surface 1b" on a part of a peripheral surface 1a ".
A ring 2 "having the same shape is pressed against the peripheral surface 1a".

The rotation of the ring 2 "is restricted by the pawls 2a" and 2b "protruding from the ring 2" being locked to a part of the device. Rotates while contacting the ring 2 ″.

[0010]

However, FIG.
According to the clutch wheel 1 'shown in FIG. 1A, when the clutch wheel 1' operates continuously, the friction coefficient between the peripheral surface 1a 'of the clutch wheel 1' and the ring 2 'decreases due to frictional heat. As a result, the transmitted torque decreases, and the expansion and contraction force of the pole suddenly drops (see FIG. 6).
(B)).

For this reason, if the fitting of the metal cylinder constituting the pole is affected by dust and the like, the pole may stop during expansion and contraction.

On the other hand, according to the clutch wheel 1 "shown in FIG.
Since the flat surface 2c "of the ring 2" is pressed, a large frictional force is generated on both sides and a large torque is transmitted to the rotating drum, but the circumferential surface 1a "of the clutch wheel 1" is When the flat surface 2c "is pressed, a maximum force acts on the peripheral surface 1a".

That is, when the clutch wheel 1 "rotates in the direction of the arrow, the ring 2" has one pawl 2a "as a fulcrum, and the other pawl 2b" can be expanded.
Flat surface 2 pressed by clutch wheel 1 "
When c "is located away from the pawl 2b" side, which is a free end, the force acting on the peripheral surface 1a "of the clutch wheel 1" increases accordingly.

As a result, the expansion and contraction force of the pole is maximized in the initial stage. However, the wear of the clutch wheel 1 ″ progresses rapidly, and the expansion and contraction force of the pole is greatly attenuated. (See FIG. 7A).

According to the clutch wheel 1 ", when the two flat surfaces 1b" and 2c "coincide with each other, the opened ring 2" is rapidly restored, and this is the peripheral surface 1a "of the clutch wheel 1". This causes a problem that a loud impact sound is generated.

In particular, the impact noise propagates through the vehicle body into the vehicle, and thus gives the driver discomfort.

[0017]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a reduction gear train including a clutch wheel in which a ring whose rotation is restricted by projecting a pawl from an open portion is pressed against a peripheral surface. , The power of the motor is transmitted to the rotating drum, and the drive cord whose one end is locked to the rotating drum is wound up and extended, and the extensible pole to which the other end of the drive cord is locked is extended. In a telescopic pole mechanism adapted to be extended and retracted, a notch surface is formed on a peripheral surface of the clutch wheel, and an open portion side of the ring is bent inward to form a flat surface, and a base end of the claw is formed. The present invention provides a clutch structure of a telescopic pole mechanism, wherein the clutch structure comes into contact with a notched surface of the clutch wheel.

[0018]

According to the present invention, when the power of the motor is transmitted to the rotating drum via the reduction gear train, the rotating drum winds or unwinds the drive cord to expand and contract the pawl.

When the pole reaches the longest and shortest states, the rotating drum stops and the clutch wheel idles to protect the motor.

At this time, the ring pressed against the peripheral surface of the clutch wheel is spread by the rotating clutch wheel, so that both frictional forces increase and a large torque acts on the rotating drum.

Accordingly, the torque is transmitted to the pole, and the expansion and contraction force of the pole is improved.

Since the clutch wheel presses the open side of the ring, extremely large friction does not occur on the peripheral surface of the clutch wheel.

Accordingly, the wear of the clutch wheel is small and the frictional force with the ring is kept almost constant for a long period of time, so that the expansion and contraction force of the pole can be stabilized to a specified value or more.

Further, the ring that has been expanded is gradually restored along the cutout surface each time the clutch wheel makes one revolution, so that no impulsive sound is generated at the time of this restoration.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view showing a corner pole for an automobile. In FIG. 1, reference numeral 10 denotes a case, in which a motor M and a pole P are fixedly mounted, and a lid 14 having a central shaft 12 protruding from a lower opening thereof, and a lid 14 extending from an upper opening thereof. A cover 18 fixed to the center shaft 12 with a nut 16 is attached.

The pole P is a multi-stage rod body formed by sequentially fitting a plurality of metal cylinders. A lens R is attached to the most advanced metal cylinder, and a luminous body is built therein. ing.

On the other hand, a rotary drum 20 is rotatably supported on the central shaft 12, and a flexible drive cord 30 having a core wire 32 insulated on the annular groove 22 is wound around the annular groove 22 of the rotary drum 20. Has been turned.

At both ends of the drive cord 30, core wires 32 are provided.
Are fixed to the power supply plate 41 fixed to the annular groove 22, and the other is a passage formed in the case 10. From 10a, it is passed through the inside of the pole P, and is locked in contact with the light-emitting body built in the pole P. The power supply plate 41 contacts the slide contact piece 43 via the rivet 42, and the slide contact piece 43
Are in contact with the power supply metal 44 fixed to the lid 18.

The power supply metal 44 has a lead wire L1
(See FIG. 2), and a grounding lead L2 (see FIG. 2) is connected to the base end of the pole P. Accordingly, if one end of the lead wire L1 is connected to the battery and the lead wire L2 is grounded to the vehicle body, the light emitting body mounted on the pole P emits light.

The power of the motor M, which is a reversible motor, is transmitted to the rotary drum 20 via a reduction gear train.

For this reason, the rotary drum 20 rotates in the forward and reverse directions, whereby the drive cord 30 is wound or unwound, and thus the pole P expands and contracts.

The reduction gear train includes a worm 51 fitted to the main shaft of the motor M, a rotating body 52 rotatably supported by the center shaft 12, and a rotatable fitting to the rotating body 52. And the planetary gears 54 rotatably fitted to the bosses 24 of the rotary drum 20.

The worm 51 meshes with the worm wheel 52a of the rotating body 52, and the planet gears 54, 5
4 meshes with the sun gear portion 52b of the rotating body 52 and the internal gear portion 53a of the clutch wheel 53.

The peripheral surface 53b of the clutch wheel 53
Is fitted with a ring 55 having a circular cross section, and a part of the ring 55 is locked at a predetermined position of the case 10.

Thus, the clutch wheel 53
Since the motor M does not rotate unless a constant torque is applied, the motor M rotates the worm 51, and when the worm 51 rotates the rotating body 52, the planetary gears 54, 54 rotate around the central axis 12, Then, the rotating drum 20 rotates in conjunction with it.

On the other hand, when the pole P reaches the longest or shortest state due to the rotation of the rotary drum 20, the rotation of the rotary drum 20 is suppressed, so that the torque of the rotary body 52 is transmitted via the planetary gears 54, 54. Clutch wheel 53
And rotate it.

When the clutch wheel 53 rotates, the projection fixed to the clutch wheel 53 switches a stop switch of the motor M to stop the motor M.

FIG. 2 shows the internal structure of the apparatus. As clearly shown in this figure, the ring 55 has a C-shape, and its opening 55a has a claw 55 facing outward.
b, 55b 'are projected. In FIG. 2, 10b
Is a concave cutout groove formed in the case 10, and the rotation of the ring 55 is restricted by positioning the claws 55b, 55b 'of the ring 55 in the cutout groove 10b.

L1 is a lead for supplying power to the luminous body, L2 is a lead for grounding, and L3, L4, L
5 is a lead wire used for controlling the motor M.

3A and 3B show the clutch wheel 53 and the ring 55. FIG. 3A is a plan view of the clutch wheel 53, FIG. 3B is a sectional view taken along the line XX 'of FIG. () Is a plan view of the ring 55.

First, as is apparent from FIG. 3 (a), a part of the peripheral surface 53b of the clutch wheel 53 is notched linearly, and this is formed as a notched surface 53c.

The clutch wheel 53 has a small coefficient of friction and excellent abrasion resistance, such as polyformaldehyde (delulin), a copolymer of trioxane and ethylenoxide (duracon), or a material obtained by adding talc thereto. Consists of materials.

As shown in FIG. 3B, a U-shaped groove 53d is formed in the peripheral surface 53b of the clutch wheel 53, and the ring 55 fits into the U-shaped groove 53d. I have.

As shown in FIG. 3 (c), the open portion 55a of the ring 55 is bent inward to form a flat surface 55c.

The ring 55 is provided with a high spring property, and comes into pressure contact with the peripheral surface 53b of the clutch wheel 53 by its own spring action.

Next, the operation of the clutch wheel 53 and the ring 55, which are essential parts of the present invention, will be described with reference to FIG.

First, as shown in FIG.
The notch surface 53c of No. 3 and the flat surface 55c of the ring 55 are in contact in the same direction.

In this state, the clutch wheel 53
Rotates in the direction of the arrow, the flat surface 5 of the ring 55
Since the peripheral surface 53b of the clutch wheel 53 comes into contact with 5c, the opening width of the opening 55a of the ring 55 becomes wider as indicated by the imaginary line.

At this time, the frictional force between the peripheral surface 53b of the clutch wheel 53 and the ring 55 increases, and the torque acting on the clutch wheel 53 increases, so that a large expansion and contraction force can be applied to the pole P. .

On the other hand, when the clutch wheel 53 makes one rotation and reaches the position shown by the imaginary line, the base end of one of the claws 55b 'of the ring 55 starts to contact the notched surface 55c of the clutch wheel 53. .

Accordingly, the ring 55 is gradually restored while the base end of the claw 55b 'is in contact with the cutout surface 55c, so that no impact noise is generated when the ring 55 is restored.

Further, the ring 55 has the claw 55b side as a fulcrum and the other claw 55b 'side can be expanded.
Since the pawl 55b ', which is a free end, is pressed by the peripheral surface 53b of the clutch wheel 53, no maximum force acts on the peripheral surface 53b.

For this reason, the wear of the clutch wheel 53 is small, and the frictional force with the ring 55 is kept substantially constant for a long time, so that the expansion and contraction force of the pole P can be stabilized to a specified value or more (see FIG. 5). ).

If the ring 55 has a rectangular cross section and the groove 53d (see FIG. 3) formed on the peripheral surface 53b of the clutch wheel 53 has a concave shape, the damping rate of the pole expansion and contraction force can be reduced. Can be smaller.

According to the above-described embodiment, the notch surface 53c formed in the clutch wheel 53 has the circumferential surface 53b cut linearly.
May be a U-shaped groove or may be slightly curved outward.

Although the above embodiment is directed to a corner pole for an automobile as shown in FIG. 1, it is needless to say that the present invention can be applied to a corner pole or an antenna having another structure. .

[0057]

According to the present invention, a notch is formed on the peripheral surface of the clutch wheel, and the open side of the ring pressed against the peripheral surface of the clutch wheel is bent inward to form a flat surface. As a result, an appropriate frictional force is generated between the clutch wheel and the ring, so that the expansion and contraction force of the pole is improved, and the pole does not stop during expansion and contraction.

Also, since the open portion side of the ring can be expanded with an appropriate pressing force, the wear of the clutch wheel can be prevented, and the frictional force between the ring and the clutch wheel can be kept substantially constant for a long time. The extension and contraction force of the pole can be stabilized to a specified value or more.

Further, since the ring pushed by the clutch wheel is gradually restored along the cutout surface of the clutch wheel, no impact sound is generated at the time of the restoration.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a corner pole for an automobile.

FIG. 2 is a plan view showing the internal structure of the device.

3A is a plan view showing a clutch wheel of the device, FIG. 3B is a sectional view taken along line XX ′ in FIG. 3A, and FIG.
Is a plan view showing the ring of the device

FIG. 4 is a plan view showing an operating state of a clutch wheel and a ring of the device.

FIG. 5 is a damping rate diagram showing a stretching force of a pole in the apparatus.

6 (a) is a plan view showing a conventional clutch wheel and ring, and FIG. 6 (b) is a damping rate diagram showing expansion and contraction force of a pole when the clutch wheel and ring are used.

FIG. 7A is a plan view showing another conventional clutch wheel and ring, and FIG. 7B is a damping rate diagram showing the expansion and contraction force of a pole when the clutch wheel and ring are used.

[Explanation of symbols]

 M motor P pole 10 case 20 rotating drum 30 drive cord 51 worm 52 rotating body 52a worm wheel part 52b sun gear part 53 clutch wheel 53a internal gear part 53b peripheral surface 53c notch surface 54 planetary gear 55 ring 55a open part 55b, 55b ' Claw 55c Flat surface

Claims (1)

(57) [Claims] 1. The power of a motor is transmitted to a rotating drum via a reduction gear train including a clutch wheel pressed against the peripheral surface of a ring whose rotation is restricted by projecting a claw at an opening. In a telescopic pole mechanism in which a drive cord whose one end is locked to a rotating drum is wound and fed to extend and retract a telescopic pole whose other end of the drive cord is locked. A notch surface is formed on the peripheral surface of the clutch wheel, and the open side of the ring is bent inward to form a flat surface so that the base end of the pawl contacts the notch surface of the clutch wheel. Characteristic clutch structure of telescopic pole mechanism.