JP3479256B2 - Power transmission device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device mounted on a driven side device such as a compressor (car air conditioner compressor) of an automobile air conditioner, and particularly to a power transmission when an overload occurs on the driven side. The present invention relates to a power transmission device including a torque limiter mechanism that shuts off power.

[0002]

2. Description of the Related Art A compressor for an automobile air conditioner is driven by transmitting power of an automobile engine to a rotary shaft via a power transmission device. This power transmission device functions as a torque limiter when the rotary shaft of the compressor on the driven side is overloaded due to seizure failure or the like, and has a structure that cuts off the transmission of power to the rotary shaft of the compressor. ing.

Conventionally, as a power transmission device of this type, for example, the one described in Japanese Utility Model Publication No. 6-39105 is known. The power transmission device described in this publication includes a pulley (driving side rotating member) of a compressor (driven side device) and a hub mounted on a rotating shaft (driven side rotating member) of the compressor (driven side device). Fitting holes are respectively formed in the side surfaces facing each other in the axial direction, and a coupling member made of an overload-breakable material is press-fitted into these fitting holes to form a torque limiter mechanism.

Then, when an overload is generated on the rotary shaft, the connecting member is broken by the power of the engine (driving power source on the driving side) of the automobile. However, in such a conventional power transmission device, when the rotating shaft is temporarily overloaded for some reason, the connecting member is broken, so that the compressor must be replaced with a new connecting member each time. There was a problem that it could not be re-driven.

As a means for solving such a problem, for example, a power transmission device disclosed in Japanese Patent Laid-Open No. 10-311399 has been proposed. In this power transmission device, a washer is interposed between an arcuate protrusion provided on the flange portion of the hub and an inner holding member, and the inner holding member is pressed by another washer by a disc spring.

Power is transmitted by frictionally connecting the inner holding member and the two washers. In addition, when the overload is applied, the washer on the hub side is released into the recess provided in the arcuate protrusion, and the inner holding member is displaced toward the hub side.
The frictional coupling described above is released by reducing the spring force of the disc spring following the movement of the washer. Therefore, power transmission can be interrupted nondestructively.

[0007]

However, in the power transmission device disclosed in the above publication, the power transmission cannot be instantaneously and completely shut off when an overload occurs on the rotary shaft of the compressor. There was a problem.

That is, even after the power transmission is cut off,
Since the spring force of the disc spring works even if it is slight, the flange portion of the inner holding member slides with the arcuate protrusion of the hub and the washer slide, so that idling torque is structurally generated, and sliding noise and friction are generated. Heat is easily generated. In particular, when frictional heat is generated, there is a risk that the rubber member connecting the outer holding member and the inner holding member is deteriorated.

When the frictional coupling is released and the power transmission is cut off, the inner holding member and the washer can move in the axial direction even if the power transmission is temporarily cut off. There was also a problem of rattling and noise due to factors such as the above.

Further, if the rubber member is melted by the above-mentioned frictional heat, even if the power transmission is temporarily cut off, the compressor must be replaced with a new holding member that has been baked. There was also a problem that it could not be re-driven.

The present invention has been made in view of the above circumstances and is capable of instantaneously and completely interrupting power transmission at the time of overload, and structurally preventing frictional heat and noise from occurring. Another object of the present invention is to obtain a power transmission device that can perform a returning operation for returning power transmission extremely easily.

[0012]

In order to achieve such an object, the power transmission device according to the invention of claim 1 of the present application has a rotating member and a rotating shaft which are coaxially rotatably arranged with respect to each other. In a power transmission device including a torque limiter mechanism that transmits power from one member to the other member and shuts off power transmission between these members when overloaded, one of the rotating members in the axial direction is provided. A power transmission member that faces the end surface of the rotary member and is rotatably displaced relative to the rotary member within a predetermined angle range; and a pressing member that presses the power transmission member against the end surface of the rotary member. An urging means for urging the pressing member together with the power transmission member so as to press-contact the end surface of the rotating member, and an urging means provided on the rotating shaft so as to face the rotating member with the power transmission member interposed therebetween. A plurality of engaging projections provided on the end surface of the rotating member and projecting toward the power transmission member at predetermined intervals in the circumferential direction, and the engagement projections of the power transmission member. A plurality of engaging portions extending in the radial direction so as to transmit power by being frictionally coupled to the engaging protrusions by overlapping with the engaging protrusions at a position corresponding to A meshing portion for transmitting rotation between the power transmission member and the rotary shaft is provided at a portion facing the shaft mounting member.

According to the present invention (the invention according to claim 1),
By pressing the pressing member against the end surface side of the rotating member by the urging force of the urging means, the engaging portion of the pressing member and the power transmitting member, the engaging portion of the power transmitting member and the engaging protrusion of the rotating member are formed. In addition to the frictional engagement, the meshing portion of the power transmission member meshes with the meshed portion of the shaft mounting member, so that the driving force is transmitted from the rotating member to the rotating shaft via the shaft mounting member, or from the rotating shaft to the shaft mounting member. The power can be transmitted to the rotary member via the rotary member and the driven-side power source can drive the driven-side device.

Further, for example, when an overload occurs on the rotary shaft side, the shaft mounting member integrally mounted on the rotary shaft and the power transmission member meshing with the flange portion of the shaft mounting member in the circumferential direction are braked. become. On the other hand, the rotating member and the pressing member integrally fixed thereto rotate relatively against the frictional engagement force with the power transmission member. The engaging portion of the power transmission member is displaced in the circumferential position with respect to the engaging protrusion of the rotating member, and is pressed by the pressing member that is urged toward the end surface side of the rotating member by the urging force of the urging means. The engaging portion of the power transmission member is housed in the recess between the engaging protrusions of the rotating member. At this time, since the meshing between the power transmission member and the shaft mounting member is released, the power transmission between the rotating member and the shaft mounting member is cut off.

Further, a power transmission device according to a second aspect of the present invention is the power transmission device according to the first aspect, wherein the power transmission member is located at a position where the power transmission member and the pressing member face each other, and the power transmission member is separated from the rotating member. A second meshing portion that meshes at a certain time is provided.

Here, the power transmission device according to a third aspect of the present application is the power transmission device according to the second aspect, wherein a surface of the pressing member on the power transmission member side is engaged with a projection for engaging engagement provided on the power transmission member. And a recessed portion that is engaged in a loosely fitted state when the protrusion is relatively rotationally displaced.

The present invention (the invention according to claims 2 and 3)
According to the present invention, in the power transmission device according to the first aspect of the present invention, since the engagement portion of the power transmission member and the concave pressure member are meshed in the circumferential direction by the second meshing portion, the power transmission The force can be set large. Moreover, in such a structure, when an overload is generated on the rotating shaft, the meshing of the second meshing portion is released against the biasing force of the biasing means, and the position of the engaging portion of the power transmission member is released. Is circumferentially displaced with respect to the engaging projection of the rotating member.

Therefore, the power transmission member is pressed by the pressing member which is urged to the end surface of the rotating member by the urging force of the urging means, and the engaging portion of the power transmitting member is between the engaging protrusions of the rotating member. Is housed in a recess. Further, since the meshing by the first meshing portion between the power transmission member and the shaft mounting member is released, the power transmission between the rotating member and the shaft mounting member is cut off.

A power transmission device according to a fourth aspect of the present invention is the power transmission device according to the first, second or third aspect, which is formed so as to open to the side opposite to the power transmission member of the rotary member. A recess for arranging the urging means, a plurality of through holes provided in a wall portion of the recess on the power transmission member side, and a plurality of through holes formed at a position facing each through hole of the power transmission member in a circumferential direction over a predetermined angle. An arc groove for inserting a bolt, a screw hole formed at a position facing each through hole of the pressing member, and a connecting bolt for connecting the biasing means in the recess and the pressing member via the through hole and the arc groove. By connecting the connecting bolt to each screw hole of the pressing member through the circular hole of the power transmission member from the through hole of the rotating member in a state where the biasing means is elastically deformed in the recess, The pressing member is a power transmission member Wherein the biases to be pressed against the end face of the rotary member.

According to the present invention (the invention according to claim 4),
The rotating member, the power transmission member, and the pressing member can be stacked on the same axis and integrally assembled with the connecting bolt while the power transmission member is relatively rotatable and displaceable.

According to a fifth aspect of the invention of the present application, in the fourth aspect, the urging means is an annular leaf spring, and the leaf springs are circumferentially spaced from each other. A portion to be mounted on a plurality of interposer members disposed near the power transmission member side wall of the recess of the rotating member and a portion between adjacent mounting portions, which is pressed by the connecting bolt. And an elastically deformable portion connected to the member.

According to the present invention (the invention according to claim 5),
By inserting an annular leaf spring into the recess of the rotary member and applying a biasing force to the plurality of connecting bolts, it is possible to assemble the pressing member with the required biasing force applied.

A power transmission device according to a sixth aspect of the present invention is the power transmission device according to any one of the first, second, third, fourth and fifth aspects, wherein the pressing member is elastic by the biasing means. The pressing member is provided with a screw hole into which a power transmission returning bolt that separates from the rotating member against the returning force is screwed.

According to the present invention (the invention according to claim 6),
When power transmission is interrupted due to overload, screw the power transmission return bolt into the screw hole provided in advance in the pressing member, and further tighten the bolt with the tip of the bolt abutting the end surface of the rotating member. By screwing in, the pressing member can be separated from the end surface of the rotating member by the biasing force of the biasing means. In this state, the engaging portion of the power transmission member housed in the recess between the engaging protrusions of the rotating member,
By interposing between the engaging protrusion of the rotary member and the pressing member, it is possible to return to a state in which power transmission is possible.

[0025]

1 to 6 show an embodiment in which a power transmission device according to the present invention is mounted on a compressor of an automobile air conditioner. In these figures, FIG.
2 is a plan view showing a part of the power transmission device cut away, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is an exploded perspective view of the power transmission device of FIGS. 1 and 2. 4 (a) and 4 (b) are shown in FIG.
The top view and the BB which show the side surface by the side of the pressing member of the power transmission plate which is the power transmission member used for the power transmission device of FIG.
It is a line sectional view. 5 is a cross-sectional view corresponding to FIG. 2 when the power transmission is cut off at the time of overload, and FIG. 6 is FIG.
FIG. 3 is a plan view showing a part of the power transmission device of FIG.

In the power transmission device, the pulley 2 (rotating member) is rotatable on the cylindrical support portion 1 by the bearing 1a in which the inner ring is fitted to the cylindrical support portion 1 of the compressor, which is the driven side device, and is prevented from coming off. Supported by. The pulley 2 has an inner cylindrical portion 2a in which the outer ring of the bearing 1a is fitted to the inner peripheral surface and prevented from coming off.
And a cylindrical belt hooking portion 2b provided on the outer side in the radial direction of the inner cylindrical portion 2a and having a belt groove formed on the outer peripheral surface thereof.
And among the end portions of the inner cylindrical portion 2a and the belt hooking portion 2b,
A disc portion 2c is formed by connecting the projecting end portions of the cylindrical support portion 1. The inner cylindrical portion 2a, the belt hooking portion 2b, and the disc portion 2c form a pulley 2 on the side of the compressor housing. An annular recess 2d that is open to the inside is provided.

Further, on the end face of the disc portion 2c of the pulley 2,
Three fan-shaped engagement protrusions 3 are provided at intervals at positions that divide the circumferential direction into three equal parts. These engaging projections 3 project to the projecting side of the cylindrical support portion 1 and are formed with a predetermined angular dimension (angle of about 40 degrees). Then, between the adjacent engaging protrusions 3 (outer surface of the disc portion 2c), three recesses for accommodating an engaging portion 5a of the power transmission plate 5 described later are formed. The angular dimension of these recesses is about 80 degrees. Further, the circular disc portion 2c of the pulley 2 will be described later at a position that divides the circumferential direction into three equal parts, specifically, at a position that is displaced by a predetermined angle in the counter rotation direction side of the pulley 2 with respect to the engaging protrusion 3. Three through holes 4 for inserting the connecting bolts 14 are formed for inserting the bolts.

An annular power transmission plate 5 (power transmission member) is stacked outside the disc portion 2c of the pulley 2 having such a shape. On the outer peripheral surface of the power transmission plate 5, fan-shaped engaging portions 5a having a predetermined angular size (angle of about 60 degrees) are formed extending in the radial direction at intervals at positions that divide the power transmission plate 5 into three equal parts in the circumferential direction. ing. Further, by forming these three engagement portions 5a on the outer peripheral surface, the engagement protrusion 3 of the pulley 2 is relatively loosely fitted on the outer peripheral surface of the power transmission plate 5 when the power transmission is interrupted. A cutout recess 6 is provided.

Further, the power transmission plate 5 is formed with an arcuate bolt insertion hole 7 serving as an arc groove for bolt insertion at a position near the center of each engagement portion 5a. Each of these bolt insertion holes 7 is formed over a predetermined angle dimension (angle of about 50 degrees), and the through hole 4 of the pulley 2 can be seen from the end side of the bolt insertion hole 7 that is the counter rotation side of the pulley 2. It has become. That is, the bolt insertion holes 7 and the through holes 4 face each other in the axial direction. Further, on the inner peripheral surface of the power transmission plate 5, a notch portion 8 (which becomes the first meshing portion 31) is formed at a position that divides the circumferential direction into three equal parts.

The bolt insertion hole 7 is formed in each engaging portion 5a.
To the outer peripheral surface of the engaging portion 5a, a projection 9 for engagement (which serves as a second engagement portion 32) is formed, which extends in the radial direction from the engagement portion 5a and projects to the projecting side of the cylindrical support portion 1. These projections 9 are formed as ridges having a curved surface in the circumferential direction and extending in the radial direction. The power transmission plate 5 having such a shape uses the power transmission plate 5 manufactured by pressing a rolled steel plate, but the power transmission plate 5 manufactured by processing a synthetic resin material, a sintered metal material, or the like. It may be the plate 5.

An annular pressing plate 10 (pressing member) is stacked on the side opposite to the pulley 2 of the power transmission plate 5 having such a shape. The pressing plate 10 has a circumferential direction of 3
Three connecting screw holes 10a for fixing to the pulley 2 are formed at equal positions by screwing the ends of male threads of a connecting bolt 14 which will be described later. Further, in the pressing plate 10, three power transmission returning bolts (not shown) are screwed into positions at which the circumferential direction is divided into three equal parts different from the positions where the screw holes 10a are formed. Screw holes 10b are formed.

Further, the pressing plate 10 has a groove 11 (second meshing part 32) having a semicircular cross section with which the projection 9 (the meshing part in the second meshing part 32) formed on the power transmission plate 5 meshes. And the recessed portion 12 into which the protrusion 9 is loosely fitted are formed at positions that divide the circumferential direction into three equal parts. That is, during the power transmission, the projection 9 of the power transmission plate 5 meshing with the groove 11 of the pressing plate 10 moves over the recess 12 of the pressing plate 10 due to the interruption of the power transmission. It has a structure that switches to a loosely fitted state.

The pulley 2, the power transmission plate 5 and the pressing plate 10 having such a shape have an annular leaf spring 13 (biasing means) arranged in the annular recess 2d of the pulley 2 and the leaf spring 13. Are elastically deformed, and are integrally connected by a connecting bolt 14 that is screwed into the pressing plate 10. Leaf spring 1
Reference numeral 3 denotes three stepped cylindrical members (interposition members) 15 in which the small-diameter portions are fitted into the through-holes (mounting portions) formed at intervals at positions that divide the circumferential direction into three equal parts. Is disposed on the side surface of the pulley 2 on the side opposite to the power transmission plate 5.

Further, in the leaf spring 13, an insertion hole different from the above-mentioned through hole (mounting portion) is formed at a position which divides the circumferential direction into three equal parts, and each insertion hole is inserted from each insertion hole. The connecting bolt 14 is inserted through the bolt insertion hole 7 of the power transmission plate 5 and is screwed into the screw hole 10 a of the pressing plate 10. Then, due to the tightening force of each connecting bolt 14 for elastically deforming the leaf spring 13 and the elastic force generated at three points in the circumferential direction that are bent by each connecting bolt 14 by this (depending on the amount of bending in FIG. 2), The frictional engagement force between the engagement protrusion 3 of the pulley 2 and the engagement portion 5a of the power transmission plate 5 and the frictional engagement force between the power transmission plate 5 and the pressing plate 10 are set. That is, the pressing plate 10 is urged toward the disc portion 2c side of the pulley 2.

Next, the hub 17, which is a shaft mounted member mounted on the rotary shaft 16 of the compressor and integrally rotating, will be described. The hub 17 has a cylindrical boss portion 17a having a spline hole into which a spline groove formed in the shaft end portion of the rotary shaft 16 is fitted, and an annular boss portion extending radially outward from the end portion of the boss portion 17a. Flange 17b and boss 17
An annular contact portion 17 protruding inward in the radial direction from the end of a
and c.

Further, the flange portion 17b is provided with three convex portions 17d (an engaged portion in the second engaging portion 32) protruding toward the power transmission plate 5 at a position where the flange portion 17b is divided into three equal parts in the circumferential direction. Has been. Then, each of these convex portions 17
d and the cutout portion 8 of the power transmission plate 5 (the second engagement portion 32
The hub 17 is mounted on the rotary shaft 16 while meshing with the meshing portion of the hub.

The hub 17 is spline-fitted to the rotary shaft 16 until the contact part 17c contacts the shaft end of the rotary shaft 16, and the bolt inserted from the through hole of the contact part 17c is used as the rotary shaft. By being screwed into a screw hole formed at the shaft end of 16, the rotary shaft 16 is integrally fixed. Although not shown, a gap adjusting plate such as a shim is interposed between the shaft end portion of the rotating shaft 16 and the abutting portion 17c to freely position the hub 17 in the axial direction. .

In the power transmission device having the above-described structure, a belt which is also hung on a crank pulley of an automobile engine and a pulley mounted on an automobile accessory other than a compressor is hung on a belt groove of the pulley 2. Therefore, as shown in FIGS. 1 and 2, the power of the automobile engine is the frictional engagement force between the engagement protrusion 3 of the pulley 2 and the engagement portion 5 a of the power transmission plate 5, and the engagement portion of the power transmission plate 5. The frictional engagement force between 5a and the pressing plate 10 is transmitted to the rotary shaft 16 of the compressor via the power transmission plate 5 and the hub 17.

When the rotary shaft 16 of the compressor is overloaded, the rotary shaft 16 and the hub 17 spline-fitted to the rotary shaft 16 and the convex portion 17d of the hub 17 (the first meshing portion 31). Notch 8 that engages with
The power transmission plate 5 having (the meshing portion of the first meshing portion 31) is in the braking state.

In such a braking state, the vehicle is powered by the power of the automobile engine against the frictional engagement force acting on the engaging portion 5a of the power transmission plate 5 and against the elastic return force of the leaf spring 13. The position of the engagement protrusion 3 of the pulley 2 with respect to the engagement portion 5a of the transmission plate 5 is displaced in the rotational direction. Then, due to the elastic return force of the leaf spring 13, the power transmission plate 5 and the pressing plate 10 are pulled toward the disk portion 2c side of the pulley 2, and the engagement portion 5a of the power transmission plate 5 is housed in the recess of the pulley 2. To be done.

Further, the engagement between the projection 9 of the power transmission plate 5 (the engagement portion of the first engagement portion 31) and the groove of the hub 17 (the engagement portion of the second engagement portion 32) 11 is released. Therefore, the state shown in FIGS. 5 and 6 is established, the power transmission to the rotary shaft 16 of the compressor is cut off, and the pulley 2 idles.

In order to restore the power transmission when the power transmission is cut off, the screw hole 10b for restoring the power transmission provided in the pressing plate 10 is prepared in advance for the power transmission returning (not shown). Screw in the bolt. By this screwing, the tip of the bolt is brought into contact with the end face of the disc portion 2c of the pulley 2, and the pressing plate 10 is moved to the leaf spring 13
By separating them against the urging force of (1), they are moved to the original positions facing each other at a predetermined interval.

At this time, the engaging portion 5a of the power transmission plate 5
Is brought into contact with the engaging protrusion 3 of the pulley 2 and the engaging portion 5a is sandwiched between the engaging protrusion 3 and the pressing plate 10, as shown in FIGS. As described above, it is possible to return to a state in which power transmission is possible.

It is needless to say that the present invention is not limited to the structure described in the above-mentioned embodiment, and the shape, structure, etc. of each part can be appropriately modified or changed. For example, in the above-described embodiment, an example in which the driving side is connected to the pulley 2 that is the rotating member and the driven side is connected to the rotating shaft 16 has been described.
These may be connected in reverse.

Further, it is preferable to take rust preventive measures such as cation electrodeposition coating or zinc coating treatment on each of the parts constituting the power transmission device described in the above embodiment. Further, in order to increase the frictional engagement force between the engagement protrusion 3 of the pulley 2 and the engagement portion 5a of the power transmission plate 5, a structure in which a friction plate is fixed to the engagement protrusion 3 or the engagement portion 5a, You may employ | adopt the structure which the protrusion formed in the joint protrusion part 3 and the recessed part formed in the engagement part 5a meshed.

The pulley 2 may be an overhang type pulley in which the belt hooking portion 3 is provided outside the pressing plate 10 in the radial direction. In addition, meshing between the meshing portion 8 provided on the power transmission plate 5 and the meshed portion 17d provided on the hub 17, and another meshing portion 9 provided on the power transmission device 5 and the meshed portion 11 provided on the pressing plate 10. The meshing is not limited to the structure of the embodiment, and another structure can be adopted.

Further, in the power transmission device described in the above embodiment, the annular leaf spring 13 is used as the urging means, but the head portion of each connecting bolt 14 and the disc portion 2c of the pulley 2 are used.
Other spring members, such as a disc spring interposed between and can be adopted as the biasing means. Further, although the engaging protrusion 3 of the pulley 2 and the engaging portion 5a of the power transmission plate 5 are fan-shaped, the engaging protrusion 3 and the engaging portion 5a may be rectangular or the like.

[0048]

As described above, according to the power transmission device of the present invention, the engaging portion provided on the power transmission member interposed between the rotary member and the pressing member is rotationally displaced within a predetermined angle range. By pressing it against the engaging projection provided on the end surface of the rotating member or by positioning it in the recess avoiding the engaging projection, the meshing portion between the power transmission member and the shaft mounting member is meshed or meshed. Despite the simple structure, the power transmission can be surely performed and the power transmission can be interrupted instantaneously even when the load is over. Moreover, it can be performed reliably.

Further, according to the present invention, it is possible to easily restore the power transmission state because a friction member which is broken or broken as in the conventional case is not required when the power transmission is cut off. For example, using a screw hole provided in the pressing member, the power transmission returning bolt is screwed to separate the pressing member from the rotating member against the biasing force, and the power transmitting member therebetween is rotationally displaced by a predetermined angle. This makes it possible to extremely easily perform a power transmission return operation.

Further, according to the present invention, the power transmission member having the engaging portion positioned in the recess between the engaging projections on the end surface of the rotating member is pressed against the end surface of the rotating member by the urging force of the urging means. Since it is held between the members, it prevents secondary accidents such as the damage of these members due to the meshing part between the power transmission member and the shaft mounting member meshing when the rotating member idles. It is reliable and safe.

Further, according to the present invention, a meshing portion different from the meshing portion of the power transmission member and the shaft mounting member is provided between the engagement portion of the power transmission member and the pressing member to mesh with each other. The power transmission force of the power transmission device can be set large. Therefore, it is possible to reduce the diameter in the radial direction and obtain a power transmission device having a small pulley diameter.

Further, according to the present invention, the urging means is not a plurality of urging means individually provided for the connecting bolts arranged at intervals in the circumferential direction but one annular leaf spring. With this structure, the urging means can be easily assembled and the productivity can be improved. Further, the engagement by the engaging portion of the power transmission member is disengaged by the urging force of the urging means,
Since the biasing force does not act on the other members, it is possible to prevent the generation of frictional heat and rubbing noise, which have been problems in the past, and to prevent noise due to rattling.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a power transmission device according to the present invention and showing a part of the power transmission device in a power transmission state in a cutaway manner.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an exploded perspective view in which main parts of the power transmission device of FIGS. 1 and 2 are disassembled.

4 (a) and 4 (b) are a plan view showing a side surface of a power transmission plate, which is a power transmission member used in the power transmission device of FIGS. Is.

5 is a cross-sectional view corresponding to FIG. 2 when the power transmission is cut off during overload.

FIG. 6 is a plan view showing a part of the power transmission device of FIG. 5 in a cutaway manner.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cylindrical support part, 2 ... Pulley (rotating member), 2c ... Disc part, 2d ... Recessed part, 3 ... Engagement projection part of a pulley end surface, 5 ... Power transmission plate (power transmission member), 5a ... Engagement Portion, 7 ... bolt insertion portion, 8 ... first engaging portion (notch portion), 9 ... second portion
Meshing parts (projections), 10 ... pressing plate (pressing member), 1
1 ... Another engaged portion (groove), 13 ... Leaf spring (biasing means),
14 ... Connection bolt, 15 ... Interposition member, 17 ... Hub (shaft mounting member), 17b ... Flange part, 17d ... Engagement part (projection part), 31 ... First meshing part, 32 ... Second meshing part .

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F16D ^7/ 02-7/10

Claims (6)

(57) [Claims] 1. A rotary member and a rotary shaft which are coaxially rotatably arranged with respect to each other, and by connecting these members, power is transmitted from one member to the other member, and at the time of overload, these members are connected. In a power transmission device including a torque limiter mechanism that disconnects the power transmission by disconnecting the two members, the power transmission device is opposed to one end face in the axial direction of the rotating member within a predetermined angle range with respect to the rotating member. A power transmission member that is relatively rotatably displaceable, a pressing member that presses the power transmission member against the end face of the rotating member, and the pressing member together with the power transmission member is pressed against the end face of the rotating member. And a shaft mounting member that is provided on the rotating shaft so as to face the rotating member with the power transmission member interposed therebetween. Is provided with a plurality of engaging projections protruding in the direction of the power transmission member at predetermined intervals, and by overlapping the engagement projections at positions corresponding to the engagement projections of the power transmission member, respectively. A plurality of engaging portions that extend in the radial direction so as to transmit power by being frictionally coupled to the engaging protrusions of, and at the portions where the power transmitting member and the shaft mounting member face each other,
A power transmission device comprising a meshing portion for transmitting rotation between the power transmission member and the rotary shaft. 2. The power transmission device according to claim 1, wherein the power transmission member and the pressing member face each other,
A power transmission device comprising a second meshing portion that meshes when the power transmission member is apart from the rotating member. 3. The power transmission device according to claim 2, wherein a groove in which a projection for meshing engagement provided in the power transmission member meshes with a surface of the pressing member on the power transmission member side, and the projection is relatively formed. A power transmission device having a recessed portion that is engaged in a loosely fitted state when rotationally displaced. 4. The power transmission device according to claim 1, claim 2, or claim 3, wherein a recess is formed so as to open toward the side opposite to the power transmission member of the rotating member, and the biasing means is disposed in the recess. A plurality of through holes provided in the wall portion of the recess on the power transmission member side, and circular arc grooves for bolt insertion formed at a position facing each of the through holes of the power transmission member over a predetermined angle in the circumferential direction, A screw bolt formed at a position facing each of the through holes of the pressing member; and a connecting bolt for connecting the biasing means in the recess and the pressing member via the through hole and the arc groove, the connecting bolt By elastically deforming the urging means in the recess, by screwing the through-hole of the rotating member through the arc groove of the power transmission member into each screw hole of the pressing member, The member is A power transmission device characterized in that the reaching member is biased in a direction in which the reaching member is brought into pressure contact with the end surface of the rotating member. 5. The power transmission device according to claim 4, wherein the urging means is an annular leaf spring, and the leaf spring is circumferentially spaced from the recess of the rotary member on the power transmission member side. Part mounted on a plurality of interposition members disposed near the wall part of the same, and an elastically deformable part formed at a site between adjacent mounting parts and connected to the pressing member via the connecting bolt. A power transmission device comprising: 6. The power transmission device according to claim 1, claim 2, claim 3, claim 4 or claim 5, wherein the pressing member resists the elastic return force of the biasing means. A power transmission device, wherein a screw hole into which a power transmission returning bolt that is separated from is screwed is provided in the pressing member.