JPH0719257A - Clutch - Google Patents

Abstract

PURPOSE:To provide a clutch which is constituted to sharply reduce the generation of noise and the occurrence of wear in a state that a clutch is disengaged and reduce size and weight and facilitate manufacture by a method wherein a slide contact part is held at a pivotal support part being the given balance point of a link mechanism comprising first and second link members and first and second repulsion bodies. CONSTITUTION:When a slide contact member 34 about to slide over the peripheral wall of the circular recessed part 31 of an engaging recessed part 33 along a peripheral direction is engaged internally of a depression recessed part 32, the engaging direction thereof is not the radial directions of rotary base bodies 10 and 20 but a direction in which inclination toward a peripheral direction is effected. As a result, the slide contact member 34 is brought into soft contact with the inner surface of the depression recessed part 32 and the generation of a collision force is sharply relaxed. Besides, a position relation between the holding position of the slide contact member 34 and the inner surface of the depression recessed part 32 is set such that even when the first and second repulsion bodies 41 and 42 are restored, the slide contact member 34 is held in a non-contact state with a gap G between the slide contact member and the inner surface of the depression recessed part 32. Thus, the slide contact member 34 is prevented from making direct collision.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch suitable for, for example, an electric antenna for an automobile, and more particularly to an improvement of a clutch element for transmitting the rotational force of a driving side rotating base body to a driven side rotating base body.

[0002]

2. Description of the Related Art Generally, a clutch of this type is a disk-shaped main drive side rotary base body that is rotated by power from a drive source such as a motor, and is arranged concentrically opposite to the main drive side rotary base body. A disk-shaped driven side rotating base body that rotates by receiving a rotational force from the base body and drives the expandable antenna and the like as a load to expand and contract, and is interposed between the driven side rotary base body and the main drive side rotating base body, In the normal state, the rotational force of the driving side rotating base body is frictionally transmitted to the driven side rotating base body, and in the overload state, the driving side rotating base body and the driven side rotating base body are slipped to couple the driving side and the load side. It is composed of a clutch element for releasing.

As the above-mentioned clutch element, concavo-convex portions which engage with each other are arranged along the circumferential direction on the respective opposing surfaces of the main rotating body and the subordinate rotating substrate, and the confronting surfaces are provided with the concavo-convex portions. In the prior art, a structure in which a leaf spring or other springs stored in a compressed state so as to urge both rotary bases so as to be in a pressure contact state has been widely used. It is also known that a ball, a roller, a cam or the like is used as a friction transmitter in order to enhance the friction transmitting force by the uneven portion.

[0004]

The above-mentioned conventional clutch has the following problems. That is, since the frictional transmitters such as the uneven portions or the balls, the rollers, the cams, etc. are directly press-contact engaged with the facing surface of the rotary base body by the leaf springs or other springs, the clutch is disengaged. In the state, that is, when the main driving side rotary base and the driven side rotary base relatively slip and rotate, the concavo-convex portions formed of a relatively hard material or the friction transmitter and the concavo-convex portion are strongly engaged. Since the removal operation is repeated, the impact sound generated at that time becomes a loud noise and the wear is severe. Therefore, it is difficult to maintain the initial performance stably over a long period of time. Further, the main rotating body, the driven rotating body, the leaf spring in the compressed state, the balls,
In order to form a clutch by integrating frictional transmission elements such as rollers and cams, a lot of accessory parts are required and the number of assembling steps is large. For this reason, the structure is complicated and the size is increased, and it is difficult to reduce the manufacturing cost.
Therefore, an object of the present invention is to reduce noise and wear in a state where the clutch is disengaged, and to be small and lightweight,
It is to provide a clutch that is easy to manufacture.

[0005]

In order to solve the above problems and achieve the object, the following measures were taken in the present invention. In the clutch in which the rotational force of the main driving side rotating base body is transmitted to the driven side rotating base body via the clutch element, the clutch element is configured as follows.

A circular concave portion (including a circular concave portion, an oval shape, a polygonal concave portion, etc.) is formed on a surface of the main driving side rotary base body facing the driven side rotary base body, and a circumferential wall surface of the circular concave portion is circumferentially formed. An engaging recess made up of one or more recesses recessed in a V shape (including a U shape that draws a gentle curve and an arc shape) is formed. A sliding contact member (including a roller, a sphere, etc.) is provided so that it can be slidably engaged with the recessed concave portion of the engagement concave portion and can be slidably contacted with the peripheral wall surface of the circular concave portion. Pivot portions for pivotally supporting both ends of the sliding contact member are provided between the tip portions of the arms, and the base end portions of the arms are pivotally supported on the surface of the driven-side rotary base body facing the drive-side rotary base body, respectively. The piston type first and second link members are provided so that each arm can expand and contract in the axial direction. The first and second link members are respectively provided with the first and second link members inside the respective arms so that the first and second link members are stored with energy in accordance with the change in the expansion and contraction degree of the arms. Insert the repellent body. Thus, the sliding contact member is configured to be held at a predetermined balance point of the link mechanism including the first and second link members and the first and second resilient members.

Incidentally, the positional relationship between the holding position of the sliding contact member and the inner surface of the depressed recess is such that when the elastic body is restored.
The sliding contact member is preferably set so as to be held in a non-contact state with the inner surface of the depression.

[0008]

As a result of taking the above-mentioned means, the following effects occur. (1) The repulsive force (load) of the first and second repellent members inserted into the arms of the first and second link members is the pivotal portion that pivotally supports the sliding contact member. They will join each other from two different directions. As a result, the elastic force (load) is decomposed in the radial direction and the circumferential direction of the rotary base.
Therefore, if the operating load (clutch pressure) of the clutch is set to the same level as that of the current product that has been conventionally used, the load in the radial direction is significantly reduced compared to the current product.
For this reason, when the clutch is disengaged, when the sliding contact member that is sliding along the circumferential wall surface of the circular concave portion in the engaging concave portion is engaged in the depressed concave portion, the engaging direction is , Not in the pure radial direction of the rotating base body, but in a direction largely inclined from the radial direction to the circumferential direction. As a result, the collision force of the sliding contact member with respect to the inner surface of the depressed recess is significantly reduced. The operating load of the clutch (clutch pressure)
Can be adjusted by changing the inclination of the depressed recess.

(2) When the elastic body is restored, the positional relationship between the holding position of the sliding contact member and the inner surface of the recessed recess is such that the sliding contact member is held in non-contact with the inner surface of the recessed recess. When set, the sliding contact member does not directly collide with the inner surface of the depression when the sliding member is engaged in the depression.

(3) Thus, when the clutch is disengaged, almost no collision noise is generated due to the engagement / disengagement of the sliding contact member with respect to the recessed concave portion, noise is greatly reduced, and wear is reduced. Since the clutch element is composed of the engagement recess, the sliding contact member, and the link mechanism including the first and second link members and the first and second elastic members, the leaf spring in the compressed state is formed. In addition, the structure is simpler than that of a conventional clutch element in which frictional transmitters such as balls, rollers, and cams are integrally formed, and it is possible to manufacture the device at a small size, light weight, and at low cost.

[0011]

1 to 3 are views showing the construction of a clutch according to an embodiment in which the present invention is applied to a clutch for an electric antenna for an automobile, FIG. 1 is a longitudinal sectional view, and FIG. 2 is FIG. A-A
FIG. 3 is a view seen from the line direction, and FIG. 3 is a plan view showing a main rotary body 10 and a driven rotary body 20 divided into two parts.

As shown in FIGS. 1 to 3, this clutch is provided with power from a motor (not shown), which is a drive source, via a two-stage reduction gear 1 and a main rotating body 10 on the driving side. , Which is concentrically opposed to the main driving side rotating base body 10 with a predetermined distance, and receives the rotational force from the main driving side rotating base body 10 to rotate and drive a telescopic antenna element (not shown) as a load. The driven-side rotating base body 20 is interposed between the driven-side rotating base body 20 and the driving-side rotating base body 10, and the rotational force of the driving-side rotating base body 10 is applied to the driven-side rotating base body 2.
And a clutch element 30 that transmits to zero. In FIG. 1, 2 is a wall of a drive mechanism casing of an automobile electric antenna, 3 is a main shaft, and 4 is a rotary drum for accommodating a rope with a rack (not shown) for extending and retracting the antenna element.

A disk-shaped drive-side rotary base member 10 is rotatably fitted on a main shaft 3, and a gear portion 11 meshing with the two-step reduction gear 1 is provided on the outer peripheral surface thereof. A cylindrical portion 12 is provided on the outer peripheral portion of the facing surface of the driving-side rotary base body 10 that faces the driven-side rotary base body 20. An annular frame body 13 for reinforcing and blindfolding is arranged so as to surround the periphery of the cylindrical portion 12.

The disk-shaped driven side rotating base body 20 is also rotatably fitted to the main shaft 3, and the cylindrical portion 2 is provided on the outer peripheral portion of the facing surface facing the driving side rotary base body 10.
Two are provided. On the outer peripheral surface of the cylindrical portion 22, there is provided a gear portion 21 which meshes with a rack portion of a rope with a rack for extending and retracting an antenna element (not shown).

The clutch element 30 is constructed as follows. That is, the driven-side rotary substrate 2 of the drive-side rotary substrate 10
As shown in FIG. 2, an engagement concave portion 33 including a circular concave portion 31 and a concave concave portion 32 is formed on the inner peripheral surface of the cylindrical portion 12 projecting from the surface facing 0. Depressed recess 32
V has a form in which it is continuously connected to the peripheral wall surface of the circular recess 31 and draws a gentle curve along the circumferential direction.
It is a letter-shaped depression. In this embodiment, one depression 32 is provided, but a plurality of depressions may be provided.

The sliding contact member 34 composed of a rotating roller can be slidably engaged with the recessed recess 32 of the engaging recess 33 and can be slidably contacted with the peripheral wall surface of the circular recess 31. It is provided as follows. This sliding contact member 34
Is the piston type first and second link members 35 and 3
6 is rotatably supported by a pivotally supporting portion 37 provided between the end portions of the respective arms 6. First and second link members 35
The base ends of the arms 36 and 36 are rotatably supported by pins 38 and 39 on the surface of the driven rotary body 20 facing the driven rotary body 10.

Piston type first and second link members 3
Reference numerals 5 and 36 respectively connect a small-diameter cylindrical body V and a large-diameter cylindrical body W slidably to each other, and each arm is provided so as to be able to expand and contract in the axial direction. Thus, the sliding contact member 34 pivotally supported by the pivot portion 37 is arranged in the radial direction of the rotary bases 10 and 20 according to the degree of arm expansion and contraction of the first and second link members 35 and 36, as indicated by the broken line in the figure. Can be displaced to.

Inside the arms of the first and second link members 35 and 36, the first and second repellent members 41 and 42, which are coil springs, are inserted and attached, respectively. These first and second elastic-repellent bodies 41 and 42 are inserted so as to store energy according to the degree of expansion and contraction of each arm of the first and second link members 35 and 36. The first and second link members 35 and 36 and the first and second elastic members 41 and 42 form a link mechanism 40. Thus, the sliding contact member 34 formed of a rotating roller is provided so as to be held at a predetermined balance point in the link mechanism 40 when the elastic members 41 and 42 are restored.

In this embodiment, the repellent bodies 41 and 4 are
When the sliding contact member 34 is restored, the sliding contact member 34 is held in a non-contact state with the inner surface of the recessed concave portion 32 with a gap G as shown in FIG. The positional relationship with the inner surface of is set.

Next, the operation and action of the clutch of this embodiment constructed as described above will be described with reference to FIGS. 4 and 5 as appropriate. When the motor (not shown) is rotated in the forward direction during the antenna extending operation, the drive-side rotary base body 10 is normally rotated in the direction of arrow M in FIG. 2 via the two-step reduction gear 1. Then, the peripheral wall surface of the depressed recess 32 contacts the sliding contact member 34, and presses the sliding contact member 34 to the right in the drawing. When the drive-side rotary base body 10 still rotates in the same direction, as shown in FIG. 4, the sliding contact member 34 is pressed at the point P1 on the peripheral wall surface of the recessed concave portion 32, so that the first and the first in the link mechanism 40. The second link members 35 and 36 are contracted while compressing the first and second elastic bodies 41 and 42. As a result, the pivot portion 37 that pivotally supports the sliding contact member 34
Moves toward the axial center as indicated by the arrow in the figure. In this way, the first and second elastic-repellent bodies 41 and 42 are charged.

The repulsive force due to the stored energy of the first and second elastic-repellent bodies 41 and 42 acts as a locking force at the point P1. Therefore, the rotational force of the driving-side rotary base 10 is reduced by the depressions 32 to
It is transmitted to the driven-side rotary base body 20 through the sliding contact member 34-link mechanism 40-pins 38 and 39. Therefore, the driven rotary body 20 rotates following the main rotary body 10 in the same direction, and the telescopic antenna element (not shown) is extended.

When the telescopic antenna element reaches the extension limit and stops its extension operation, the driven side rotating base body 20 stops rotating and assumes a locked state. On the other hand, the driving-side rotary base body 10 continues to rotate as it is due to the power of the motor. In such a situation, the relative rotational force of the two rotary bases 10 and 20 exceeds the locking force at the point P1, so that the sliding contact member 34 has been locked until then as shown in FIG. The concave recess 32 is separated from the point P1 and moves to the point P2 on the circumferential wall surface of the circular recess 31. At this time, the sliding contact member 34 comes to be pressed by the peripheral wall surface of the circular recess 31, so that the first and second link members 35 and 36 of the link mechanism 40 have the first and second repellent members 41. , 42 are further reduced while compressing. As a result, the pivot portion 3 that pivotally supports the sliding contact member 34
As indicated by the arrow in the figure, 7 further approaches the displacement in the axial direction.

Immediately after exhibiting such a state, the sliding contact member 34 starts sliding along the peripheral wall surface of the circular recess 31. The sliding contact member 34, which is sliding on the circumferential wall surface of the circular recess 31 along the circumferential direction, is once engaged in the recessed recess 32 every time it makes a round in the engagement recess 33, and then continuously. It separates from the depression 32 and slides on the peripheral wall surface of the circular depression 31. After that, this operation is repeated. That is, the clutch is disengaged.

When the clutch is disengaged, the fact that the clutch is released is detected by some detecting means. Immediately after this detection operation, a motor control circuit (not shown) operates, the motor power is cut off, and the rotation of the motor is stopped.
For this reason, the rotation of the drive-side rotary base body 10 is stopped, and the extension operation of the telescopic antenna element is completed.

When the motor (not shown) rotates in the reverse direction during the antenna reduction operation, the main rotating body 10 on the driving side reversely rotates in the direction of arrow N in FIG. Each part operates. The operation of the retractable antenna element at the time of contraction is basically the same, except that the direction such as the rotation direction is opposite to that at the time of extension of the retractable antenna element described above. Therefore, the description of the operation is omitted.

The following effects occur in the above embodiment. First, the first and second repellent members 41 and 42 inserted into the arms of the first and second link members 35 and 36, respectively.
The elastic repulsive force (load) of (1) is applied to each other in two substantially orthogonal directions by the pivotally supporting portion 37 that pivotally supports the sliding contact member 34. As a result, the elastic repulsive force (load) is applied to the rotary substrates 10 and 2.
It will be decomposed into a radial direction of 0 and a circumferential direction. Therefore, when the operating load (clutch pressure) of the clutch is set to the same level as that of the current product that has been conventionally used, the load in the radial direction is significantly reduced as compared with the current product. Therefore, when the clutch is disengaged, the engagement recess 3
When the sliding contact member 34 sliding along the circumferential direction on the circumferential wall surface of the circular recess 31 in FIG. 3 is engaged in the recessed recess 32, the engagement direction is the radius of the rotary bases 10, 20. The direction is not a direction but a direction inclined largely in the circumferential direction. As a result, the sliding contact member 34 comes into soft contact with the inner surface of the recessed recess 32, and the collision force is significantly reduced. Moreover, in the present embodiment, the positional relationship between the holding position of the sliding contact member 34 and the inner surface of the recessed recess 32 is when the first and second resilient members 41 and 42 are restored, as shown in FIG. However, the sliding contact member 34 is set so as to be held in a non-contact state with the inner surface of the depressed concave portion 32 with the gap G interposed therebetween. Therefore, when the sliding member 34 is engaged in the depression 32, the sliding contact member 34 is prevented from directly colliding with the inner surface of the depression 32.

Thus, the collision noise caused by the engagement and disengagement of the sliding contact member 34 with the disengagement of the sliding contact member 34 in the disengaged state of the clutch is hardly generated, the noise is significantly reduced, and the wear is reduced. Then, the clutch element has an engagement recess 33,
Since the sliding contact member 34 and the link mechanism including the first and second link members 35 and 36 and the first and second elastic members 41 and 42 are used, the compressed leaf spring and further Is simpler in structure than a conventional clutch element that is configured by integrating a friction transmitter such as a ball, a roller, and a cam, and is small in size, lightweight, and inexpensive to manufacture.

The clutch of the present embodiment can be easily applied to any gear in the reduction gear mechanism connected to the motor, for example, the worm wheel closest to the motor side, and therefore can be designed. Greater freedom.

The present invention is not limited to the above embodiment. For example, in the above-described embodiment, an example in which the present invention is applied to a clutch for an electric antenna for an automobile is shown, but it can be widely applied to an actuator for an automobile door lock and the like. Of course, various modifications can be made without departing from the scope of the present invention.

[0030]

According to the present invention, the sliding contact members are the first and second sliding contact members.
Since it is provided so as to be held by the pivotal support portion which is a predetermined balance point of the link mechanism composed of the first link member and the first and second elastic members, the sliding contact member is inserted in the recessed concave portion. Is not a radial direction but a direction inclined largely in the circumferential direction. In particular, when the sliding contact member is provided so as to be held in a non-contact state with the inner surface of the depression when the elastic body is restored, the sliding contact member does not directly collide with the inner surface of the depression. . Therefore, the impact when the sliding contact member engages with the recessed concave portion of the engaging concave portion is significantly reduced, and as a result,
Noise and wear are significantly reduced when the clutch is disengaged. Further, since the structure is simple, it is possible to provide a clutch that is small and lightweight and easy to manufacture.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the structure of a clutch according to an embodiment of the present invention.

FIG. 2 is a view of FIG. 1 viewed from the direction of arrow AA, showing the relationship between the main driving side rotating base body, the clutch element, and the driven side rotating base body of the clutch according to the embodiment.

FIG. 3 is a plan view of the clutch according to the above embodiment, which is divided into a main driving side rotating base portion and a driven side rotating base portion and viewed from the facing surface side.

FIG. 4 is a view for explaining the operation and action of the clutch according to the above embodiment.

FIG. 5 is a view for explaining the operation and action of the clutch according to the above embodiment.

[Explanation of symbols]

1 ... Two-step reduction gear 2 ... Casing wall of antenna drive mechanism 3 ... Main shaft 4 ... Rotating drum 10 ... Driving side rotating base 20 ... Driven side rotating base
30 ... Clutch element 31 ... Circular recess 32 ... Depression recess
33 ... Engagement concave part 34 ... Sliding contact member 35, 36 ... 1st, 2nd link member 37 ... Pivot part 38, 39 ... Pin 40 ... Link mechanism 41, 42 ... 1st, 2nd repellent member G ... Gap V ... Small diameter cylinder
W ... Large diameter cylinder

Claims (2)

[Claims] 1. A clutch in which the rotational force of a driving-side rotating base is transmitted to a driven-side rotating base through a clutch element, the clutch being formed on a surface of the driving-side rotating base facing the driven-side rotating base. And a circular recess, and an engaging recess formed of a V-shaped recess along the circumferential wall of the circular recess, and a sliding contact engagement with the recess in the engaging recess. A sliding contact member that is insertable and is slidably contactable with the peripheral wall surface of the circular recess, and a pivot portion that pivotally supports both ends of the sliding contact member is provided between the tip portions of the arms. The base end portion of each arm is axially supported by the surface of the driven-side rotary base body facing the main-drive-side rotary base body, and each arm is provided so as to extend and contract in the axial direction. , The second link member, and the first and second link parts The first and second repellent bodies respectively inserted into the respective arms of the first link member and the second link member so as to store energy according to the change in the expansion and contraction degree of each arm of the material. A clutch characterized by comprising a clutch element consisting of. 2. The positional relationship between the holding position of the sliding contact member and the inner surface of the recessed recess is such that the sliding contact member is held in a non-contact state with the inner surface of the recessed recess when the elastic body is restored. The clutch according to claim 1, wherein the clutch is set.