JPH0557459U - Clutch device for power antenna - Google Patents

Abstract

(57) [Abstract] [Purpose] In a clutch device provided for a power antenna, it is possible to reliably mitigate the impact at the time of engagement between the clutch plate and the drive gear. [Structure] A plurality of ring-shaped concave and convex ribs 3c and 12b are formed on the facing surfaces of the internal gear 3 and the drive gear 6, and a highly viscous grease 13 is filled in a meshing gap between the ring-shaped ribs. Configured.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a clutch device for a power antenna mounted on a vehicle such as a passenger car.

[0002]

[Problems to be Solved by Prior Art and Invention]

 Generally, some vehicles of this type are equipped with a power antenna in which the antenna pole automatically expands and contracts based on the motor drive. In such a device, a drive-side gear, such as an internal gear that is driven in linkage with the motor drive, meshes with a drive code for expanding and contracting the antenna pole, and the drive code is sent out and rewound. It is necessary to provide a clutch device in the power transmission system to the drive gear that operates so as to cut off the power transmission when an overloaded state is caused by the clutch device.

In such a clutch device, when the drive gear is, for example, an internal gear, a drive gear is rotatably attached to the gear shaft of the internal gear while being adjacent to the internal gear. While supporting the clutch plate, the clutch plate is axially movably supported while rotating integrally with the gear shaft of the internal gear, and the clutch claws formed on the clutch plate are inserted into the clutch holes formed on the drive gear. The clutch plate is urged by an ammunition machine so that it engages, and when the overload condition occurs, the clutch plate moves in the axial direction of the gear shaft against the ammunition machine so that the clutch claw may come out of the clutch hole. The power transmission is cut off by moving.

By the way, in the overloaded state in which the power transmission is cut off, the internal gear rotates in response to the driving of the motor, but the drive gear does not rotate but goes into a lock state. Then, the clutch plate, which rotates integrally with the internal gear, moves axially against the urging force of the ammunition so that the clutch claws come out of the clutch holes. In other words, the clutch claws go over the mountain, slip out of the clutch holes that have been locked until then, and fall into the next clutch hole. However, when the clutch claw comes out of the clutch hole to cross the mountain, the overload condition that was working on the internal gear and the clutch plate suddenly disappears, which causes the internal gear and the clutch plate to receive the motor driving force. It will rotate rapidly. The clutch claw will drop into the next clutch hole in such a rapid rotation state, but since it is moving rapidly, it will fall into the clutch hole at a position beyond the edge of the clutch hole. As a result, there is a problem that a large unpleasant noise is generated when the clutch claw is engaged with the clutch hole.

Therefore, conventionally, as disclosed in Japanese Utility Model Laid-Open No. 63-121909 and Japanese Utility Model Laid-Open No. 62-26904, a damper rubber for preventing unpleasant noise is provided at a portion where a clutch claw of a drive gear falls. There is also an attempt to prevent the noise generation when overloaded. However, since this product receives the clutch claws that fall in the state of rapid rotation under overload, a special product with excellent wear resistance and impact resistance must be adopted, and it has high reliability. It is difficult to maintain the durability for a long period of time, and there is a problem that assembly workability is poor because it is necessary to firmly attach it so that the damper bar does not peel off.

[0006]

[Means for Solving the Problems]

 The present invention was devised with the object of providing a clutch device for a power antenna that can eliminate these drawbacks in view of the above-mentioned circumstances, and a drive side that is driven in connection with a motor drive. A gear and a drive gear that is rotatably supported by the gear shaft of the drive-side gear and meshes with a drive cord for expanding and contracting the antenna pole to send out the drive cord and rewind it; A clutch pawl that is axially movably supported while being integrally rotated with the gear shaft of the side gear and that can be engaged with the clutch hole formed in the drive gear is formed, and the clutch pawl engages with the clutch hole. In a clutch device for a power antenna, which is formed by arranging a clutch plate urged by a bullet blaster in a stacked manner in the axial direction, a drive gear and a drive gear are provided. A plurality of ring-shaped concavo-convex ribs, which are concentrically formed with the gear shaft as the axis and mesh with each other with a gap therebetween, are formed on each of the facing surfaces of the concavo-convex rib. It is characterized by being filled with grease. With this configuration, the present invention makes it possible to reliably absorb the impact during engagement between the clutch plate and the drive gear over a long period of time.

[0007]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a casing of an actuator portion for a power antenna, in which a casing 1 is provided with an input gear 2 to be inputted by a motor output shaft (not shown) and an internal gear portion 3a meshing with the input gear 2. The internal gear 3, which corresponds to the drive gear of the present invention, the support shaft 4 which axially supports the internal gear 3, and the gear boss shaft 3b of the internal gear 3, are freely rotated so as to be adjacent to the internal gear 3. A drive gear 6 in which an operating tooth portion 6a meshing with a drive cord 5 for freely expanding and contracting an antenna pole (not shown) is formed, and is sent out and rewound based on forward and reverse rotations of the drive gear 6. The gear boss part rotates integrally with the cord case 7 and the internal gear 3 that house the drive cord 5 in a spiral shape, but is movable in the axial direction. A material device such as a clutch plate 8 key-fitted to b, a bullet 9 for urging the clutch plate 8 toward the internal gear 3 side, and a bullet receiver 10 for supporting the end of the bullet 9. Is decorated. The clutch claws 8a provided on the clutch plate 8 are normally engaged with the clutch holes 6b provided on the drive gear 6 by the biasing force of the ammunition 9, whereby the internal gear 3 is prevented. Although power is transmitted to the drive gear 6 side, if the overload condition occurs and the sliding resistance of the clutch claw 8a and the clutch hole 6b due to the urging force of the ammunition on the tapered surface is exceeded, the clutch plate 8 will By moving in the direction away from the drive gear 6 against the ammunition 9, the engagement of the clutch claw 8a with the clutch hole 6b is released, whereby the power transmission is cut off. In this way, the clutch device 11 is formed in the power transmission system from the internal gear 3 to the drive gear 6.

Reference numeral 12 denotes a slip plate interposed between the internal gear 3 and the drive gear 6 and the facing surface thereof. The slip plate 12 has a locking projection 12 a formed on the surface facing the drive gear 6. The locking projection 12a is engaged with a system stop hole 6c formed in the drive gear 6 so as to rotate integrally with the drive gear 6. On the other hand, ring-shaped concavo-convex ribs 12b and 3c formed in concentric circles with the gear boss axis as an axis are formed on the respective facing surfaces of the slip plate 12 and the internal gear 3, respectively. Sliding contact surface portions 12c and 3d, which are in sliding contact with each other, are formed respectively on the outer peripheral facing surfaces of the internal gear 3 and the internal gear 3, and the slip plate 12 and the internal gear 3 are connected to each other by the sliding contact surface portion 12c, By combining the 3d members so as to abut each other, the concave and convex ribs 12b and 3c are set to mesh with each other with a gap therebetween. In this way, the highly viscous grease 13 is filled in the gap that is almost sealed by the sliding contact surface portions 12c and 3d, and the high viscous resistance of the grease 13 keeps the drive gear 6 in an overloaded state. The internal gear 3 rotates differentially in a state where resistance is applied to the drive gear 6 when it is locked.

In the embodiment of the present invention configured as described above, the internal gear 3 rotates due to the driving of the motor, but this rotational force is transmitted to the drive gear 6 via the clutch device 11. Then, the drive cord 5 meshing with the drive gear 6 is sent out and rewound, whereby the expansion and contraction of the antenna pole can be automatically performed. Then, when the antenna pole is pushed by hand or the antenna pole is frozen in the winter season and becomes overloaded, the clutch plate 8 resists the urging force of the ammunition 9 as described above. The clutch claws 8a move in a direction away from the drive gear 6 and move in a state in which the clutch claws 8a jump over the clutch holes 6b in a mountain jumping state, whereby the power transmission by the clutch device 11 is interrupted and each member is cut off. However, the unpleasant noise that is generated when the teeth are skipped is surely suppressed.

That is, in this structure, there is a gap between the slip plate 12 configured to rotate integrally with the drive gear 6 and the drive-side internal gear 3 on which the motor load directly acts. There are ring-shaped concavo-convex ribs 12b and 3c that mesh with each other, and these gaps are filled with high-viscosity grease 13 so as to resist the free rotation between them, and the internal gear 3 to the slip plate 12 and An action to follow the rotation state of the drive gear 6 works. Therefore, in the overload state, the drive gear 6 goes into a locked state and stops rotating, and the clutch claw 8a comes out of the clutch hole 6b so as to cross the gap between the clutch holes 6b, and the internal gear 3 and the clutch plate. When the overload on 8 is eliminated, the internal gear 3 and the clutch plate 8 do not rotate rapidly under the motor driving force, and the viscous resistance force of the high viscosity grease 13 resists the motor driving force. Therefore, the internal gear 3 and the drive gear 6 do not rotate rapidly as in the conventional case, so that the clutch claw 8a moves to the next clutch hole. When it falls into 6b, it does not fall down past the edge of the hole, and it is a tapered surface formed in the clutch claw 8a or the clutch hole 6b. Gently at along jar state 落Komi, it does not occur rattling and unpleasant sound.

As described above, in the present invention, the clutch mechanism for connecting and disconnecting the power between the clutch plate 8 and the drive gear 6 is of a mechanical meshing type in which the clutch claw 8a engages with the clutch hole 6b. However, the drive gear 6 is locked and the drive-side internal gear 3 and the clutch plate 8 run idle with respect to the drive gear 6 in the locked state. At this time, the high-viscosity grease 13 provides resistance to the idling rotation of the internal gear 3 and the clutch gear 8 and restricts the rapid rotation of the internal gear 3 and the clutch gear 8 to prevent the gear teeth of the clutch pawl 8a from jumping to prevent noise generation. Will be. Moreover, since the gap for enclosing the high-viscosity grease 13 occupies an almost constant volume without being affected by the intermittent power supply of the clutch, the holding capacity of the high-viscosity grease 13 is lowered for a long period of time. And the reliability can be remarkably improved.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and in the embodiment, the input of the motor driving force to the internal gear 3 which is the driving side gear is performed via the input gear 2. However, it is also possible to directly input the motor driving force without the intervention of the input gear 2 and to form the concave and convex ribs 12b formed on the drive gear 6 side. Although it is formed on the slip plate 12 provided so as to rotate integrally with the drive gear 6, the present invention is not limited to this, and a concave and convex rib may be directly formed on the drive gear. However, it is convenient because it can reduce the number of parts.

[0013]

[Operation effect]

 In summary, since the present invention is configured as described above, the drive-side gear receives the load corresponding to the viscous resistance of the high-viscosity grease filled between the facing surfaces of the drive gear and the drive-side gear. Will rotate relative to the drive gear. As a result, the drive gear becomes overloaded on the drive gear side, and the drive gear is locked, and the clutch claw is pulled out from the clutch hole to cross the gap between the clutch holes and the overloaded state is released. The rapid rotation of the clutch plate is regulated and forced to rotate at a low speed, which ensures that the clasp's claw drops into the next clutch hole gently and prevents rattling and unpleasant noise. it can. Moreover, since the gap that encloses this high-viscosity grease is formed between the concave and convex ribs, the surface area that can receive viscous resistance is much larger than when it is made flat. In addition, it can be secured and is almost constant without being affected by the intermittent power supply of the clutch, so that the holding capacity of high viscosity grease does not decrease for a long period of time and the reliability can be remarkably improved. become.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which a power transmission mechanism is incorporated in a power antenna casing.

FIG. 2 is a sectional view showing a state in which a slip plate is attached.

[Explanation of symbols]

 3 Internal gear 3b Gear shaft 3c Ring-shaped uneven rib 5 Drive cord 6 Drive gear 6b Clutch hole 8 Clutch plate 8a Clutch claw 9 Bullet machine 11 Clutch device 12b Ring-shaped uneven rib 13 High viscosity grease

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Claims (1)

[Scope of utility model registration request] 1. A drive-side gear that is driven by being linked to a motor drive, and a drive cord that is rotatably supported by a gear shaft of the drive-side gear and meshes with a drive cord for extending and contracting an antenna pole. The drive gear that sends and rewinds the cord and the clutch pawl that is axially movably supported by the gear shaft of the drive-side gear while being integrally rotatable are engaged with the clutch holes formed in the drive gear. A clutch device for a power antenna, which is formed by arranging a clutch plate, which is formed and further urged by an ammunition machine so that the clutch claw engages with the clutch hole, in a laminated manner in the axial direction. On each facing surface of the gear and drive gear,
In addition to forming a plurality of ring-shaped uneven ribs that are formed in concentric circles with the gear shaft as an axis and mesh with each other with a gap,
A clutch device for a power antenna, characterized in that a highly viscous grease is filled in a meshing gap between the uneven ribs.