JP4270338B2 - Torque limiter with clutch and on / off function - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a torque limiter having a clutch and an on / off function, particularly between a rotational drive source and a load device, and acts as a torque limiter when a load device in operation is malfunctioning. The present invention relates to a torque limiter having an on / off function for turning off torque transmission and a clutch of a component thereof.
[0002]
[Prior art]
As a torque limiter having a clutch and an on / off function, it is conventionally known to use an electromagnetic clutch or the like for the clutch portion, but it is not suitable for a small-sized and low-cost device.
[0003]
[Problems to be solved by the invention]
An object of the present invention is to propose a simple structure in a torque limiter having a clutch and an on / off function.
[0004]
As a means for solving this problem, the present applicant has already applied for Japanese Patent Application No. 7-294878 and published in Japanese Patent Application Laid-Open No. 9-112568. A structure using force is known. That is, a torque limiter or clutch comprising an inner ring arranged coaxially with each other, a coil spring wound tightly on the outer circumference of the inner ring, and an outer ring having a gap around the outer circumference of the coil spring, and both ends of the coil spring Is a torque limiter or clutch comprising hook portions formed so as to protrude in the winding direction, and hook portion locking means embedded in the inner periphery of the outer ring corresponding to the hook portions, respectively. . The present invention is further developed based on this technology.
[0005]
[Means for Solving the Problems]
In order to solve this problem, the present invention proposes the following means. That is, an inner ring, a first housing having a coil spring wound on the outer periphery of the inner ring and having hook portions at both ends, a bottom portion that pivotally supports the inner ring, and a semi-cylindrical portion that stands up from the bottom portion , and a second housing comprising a disk-shaped lid portion for supporting the inner ring and the semi-cylindrical portion rising from the cap portion, the second housing slides together with said first housing, said first Edges A and B of the semi-cylindrical part of one housing and edges C and D corresponding to the edges A and B of the semi-cylindrical part of the second housing are the hook parts of the coil spring. Form a gap to be locked, rotate the second housing, and turn on by pushing the hook portion at the edge, or fix the second housing and rotate the inner ring, Said at the edge A clutch to be turned off by pressing the click portion, and the inner ring of the clutch inner ring disposed coaxially with one another, are wound in interference fit on the outer periphery of the inner ring, which is formed to protrude relative to the winding direction a coil spring having a hook portion, an outer ring having a gap on the outer periphery of the coil spring, a torque limiter and a hook locking means embedded in the inner circumference of both ends each of the corresponding outer ring to the hook portion of the coil spring consists, it is to propose a torque limiter comprising an on-off function, characterized in that formed by coupling the inner ring of the inner ring and the torque limiter of the clutch.
[0006]
Further, the torque having an on / off function for preventing an unintended mounting direction of the coil spring of the clutch when the angle between the edges A and B of the semi-cylindrical portion of the first housing is 180 ° or more. A limiter is proposed.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a cross-sectional view showing an embodiment of a torque limiter having a clutch and an on / off function according to the present invention, and FIG. 2 is an exploded sketch of a portion of the clutch. Hereinafter, description will be made with reference to both FIG. 1 and FIG.
[0008]
The structure of the torque limiter having the clutch and the on / off function is roughly composed of the clutch 1 and the torque limiter 100. The clutch 1 has a specific on / off action for torque transmission between the inner ring 2 on the torque output side and the second housing 4 on the torque input side. That is, when applying torque from the second housing 4, the torque is always transmitted to the inner ring 2 in a clutch-on state. As a reverse transmission direction, when torque is applied from the inner ring 2 with the first housing 3 fixed, the clutch is turned off and the second housing 4 does not transmit torque. The attached torque limiter 100 transmits torque up to a certain set torque value between the inner ring 101 and the housing 104 and acts to slip when the set torque value is exceeded.
[0009]
Regarding the configuration of the clutch 1, the inner ring 2 serving as an output side member for torque transmission, the coil spring 5 wound around the outer periphery thereof, the first housing 3 disposed at a position surrounding the inner ring 2, and the torque sliding while sliding on the first housing 3 It consists of the 2nd housing 4 used as the input side member of transmission.
[0010]
The inner ring 2 is made of a cylindrical metal, and one end of the inner ring 2 is provided with protruding keys 201 at two or more places. These keys 201 are provided on the other side of torque transmission. A function corresponding to the key groove, for example, the key groove of the inner ring 101 of the torque limiter 100 is provided.
[0011]
The coil spring 5 is wound around the outer periphery of the inner ring 2 with an interference fit, and a frictional force exists between the coil spring 5 and the inner ring 2. The coil spring 5 includes hook portions 501 and 502 at both ends thereof. When a force to be applied to either of the hook portions 501 and 502 is applied, the frictional force between the coil spring 5 and the outer peripheral surface of the inner ring 2 is weakened. On the contrary, when a force acts on the hook portions 501 and 502 in the winding direction or when no force acts, the frictional force between the inner ring 2 and the coil spring 5 is increased or maintained, and the torque transmission mode is set. Become.
[0012]
The first housing 3 has a shape having a bottom 311 and a semi-cylindrical semi-cylindrical portion 312 standing upright therefrom. The bottom 311 is provided with a hole for pivotally supporting the inner ring 2. There are an edge A and an edge B at both ends of the semi-cylindrical part 312, and the edge A is formed so that the hook part 501 of the coil spring 5 can be locked, and the hook part 502 of the coil spring 5 is engaged with the edge B. It is formed so that it can be stopped.
[0013]
The second housing 4 has a shape having a disc-shaped lid portion 401 inscribed in the first housing 3 and a semi-cylindrical portion 412 standing upright therefrom. The lid portion 401 is provided with a hole 402 penetrating in the center, and can be used for various so-called escapes such as penetrating a shaft (not shown). A keyway 403 is provided on the outer side of the lid 401, and corresponds to be locked to a torque transmission input key (not shown). There are an edge C and an edge D at both ends of the semi-cylindrical part 412, and the edge C corresponds to the hook part 501 of the coil spring 5 to be locked, and the edge D is associated with the hook part 502 of the coil spring 5. Respond so that it can be stopped.
[0014]
Here, each of the semi-cylindrical portions 312 and 412 of the outer first housing 3 and the inner second housing 4 has a total of 360 angles in the radial direction forming a cylinder in the radial direction from the center point of each inner ring. It is a shape obtained by excising a part of an angle. These semi-cylindrical portions 312 and 412 form a substantially closed cylindrical surface that complements the radial direction. Regarding the sliding structure between the first housing 3 and the second housing 4, the arcuate edge 322 of the first housing 3 circumscribes the arcuate edge 422 of the second housing 4. The inner diameter side of the arcuate edge 422 also functions to support the end of the inner ring 2. Further, the arc-shaped bank of the bottom 311 of the first housing 3 is inscribed in the arc-shaped edge 411 of the second housing 4. In the cylindrical contour formed by the first housing 3 and the second housing 4 in this way, hook portions 501 and 502 of the coil spring 5 are disposed between the edge portions A and C, and B and D. A gap in which the hook portions 501 and 502 can move in a range of minute angles in the radial direction is opened and acts as a locking means. Therefore, the outer first housing 3 and the inner second housing 4 have a notch formed between the edges A and C, and B and D while sliding in the radial direction. Become.
[0015]
The configuration of the torque limiter 100 includes an inner ring 101, a coil spring 103 around the outer periphery, a housing 104 disposed on the outer periphery, and a lid 106 for fixing these constituent members. Two protruding keys 105 for torque transmission are provided at the end of the housing 104, and a key groove 102 for torque transmission is also provided on the inner ring 101 . The key groove 102 is disposed so as to be engaged with the key 201 of the clutch 1, for example. The hook portion is locked in any rotation direction at a locking portion (not shown) and acts as a torque limiter. The coupling is convenient when the diameter of the inner ring 101 of the torque limiter 100 is equal to the diameter of the inner ring 2 of the clutch 1, but a coupling jig is required even if the diameter is different, but for the intended function. There is no obstacle to getting.
[0016]
FIG. 3 is a radial sectional view for explaining the operation of the clutch according to the present invention. When the second housing 4 that is the input side of torque transmission is rotated to the right, the edge C pushes the hook portion 501 of the coil spring 5 to cause the coil spring 5 to be further tightly fitted to the inner ring 2. Is clutch-on. Even if the second housing 4 is rotated counterclockwise, the edge D pushes the hook portion 502 of the coil spring 5 and the clutch is similarly turned on. At this time, the first housing 3 only rotates in association with other members, and no significant force acts on the hook portions 501 and 502 of the coil spring 5.
[0017]
In the mode in which the clutch is turned off, the first housing 3 is fixed in a state where torque is applied from the inner ring 2. At this time, when the coil spring 5 rotates clockwise, the hook portion 501 presses the edge A, and a force acts in a direction to loosen the coil spring 5. At the time of left rotation, the hook portion 502 pushes the edge portion B, and similarly, a force acts in the direction of loosening the coil spring 5.
[0018]
FIG. 4 is a radial cross-sectional view for comparison and reference, and shows an example of arrangement in another torque transmission mode. In this arrangement example, when rotational torque is applied from the second housing 4, the edge C or D pushes the hook portion 501 or 502 in the direction in which the coil spring 5 is loosened in any rotational direction. When rotational torque is applied from the first housing 3 in the opposite direction of torque transmission, the edge A or B pushes the hook portion 501 or 502 in the direction in which the coil spring 5 is tightened in any rotational direction. That is, it acts as a single transmission directional clutch.
[0019]
3 is compared with FIG. 4, the positions of the edges A and B are 180 degrees in FIG. 3, whereas the positions of the edges A and B are 180 degrees or less in FIG. 4. When the edge-to-edge angle is 180 ° or more, the coil spring 5 can be mounted only in one fixed direction. That is, an unintended mounting direction can be prevented.
[0020]
In the clutch portion according to the present invention described above, various modifications can be made within the technical idea of the present invention. For example, as a hook portion locking means of the coil spring, not only the edge portion of the housing but also a hole portion or a protruding portion only in a necessary portion may be used. In addition, the magnitude relationship between the diameters of the first housing and the second housing may be reversed from that in the above embodiment. It is also possible to configure the inner ring of the torque limiter part and the inner ring of the clutch part as a common inner ring.
[0021]
【The invention's effect】
As described above, according to the present invention, a torque limiter having a simple structure clutch and an on / off function can be obtained. It is possible to perform a multi-function operation that protects at the time of maintenance and clutch-off at the time of maintenance.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an embodiment of a torque limiter having a clutch and an on / off function according to the present invention.
FIG. 2 is an exploded sketch of an embodiment of a clutch according to the present invention.
FIG. 3 is a radial sectional view for explaining the operation of the clutch according to the present invention.
FIG. 4 is a radial sectional view for comparison and shows an example of arrangement in another torque transmission mode.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Clutch 2 ... Inner ring 3 ... 1st housing 4 ... 2nd housing 5 ... Coil spring 100 ... Torque limiter 101 ... Inner ring 103 ... Coil spring 104 ... Housing 501, 502 ... Hook part

Claims (2)

An inner ring, the wound in interference fit to the inner ring of the outer periphery, the first housing having a coil spring having respective hook portions at both ends, a bottom for supporting the inner ring and a semi-cylindrical portion rising from the bottom, the and a second housing comprising a disk-shaped lid portion for supporting the inner ring and the semi-cylindrical portion rising from the cap portion, the second housing slides together with said first housing, said first Edges A and B of the semi-cylindrical part of the housing and edges C and D corresponding to the edges A and B of the semi-cylindrical part of the second housing lock the hook part of the coil spring. Forming a gap to be turned on by rotating the second housing and pushing the hook portion at the edge, or rotating the inner ring while fixing the second housing to rotate the edge With the hook part And the clutch to be turned off by Succoth,
An inner ring disposed coaxially with the inner ring of the clutch is wound tight fit on the outer periphery of the inner ring, and a coil spring having a winding hook portion formed to protrude to the direction, clearance to the outer periphery of the coil spring A torque limiter comprising: an outer ring having a hook part locking means embedded in an inner periphery of the outer ring corresponding to the hook parts at both ends of the coil spring ;
Consisting of
Torque limiter comprising an on-off function, characterized in that formed by coupling the inner ring of the torque limiter and the inner ring of the clutch. In claim 1,
A torque limiter having an on / off function , wherein an angle between the edges A and B of the semi-cylindrical portion of the first housing is 180 ° or more .

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