JP4630177B2 - Torque limiter - Google Patents

Description

  The present invention relates to a torque limiter that transmits torque by a hysteresis torque generated between a permanent magnet and a semi-hard magnetic material.

  A so-called magnet type torque limiter (hereinafter referred to as “torque limiter”) using hysteresis torque is used in a paper feeding device such as a copying machine, a printer, a facsimile, or a reel base driving device of an audio / video device.

  A torque limiter has been conventionally manufactured and sold by a parts manufacturer without a shaft as a part of an external member such as a paper feeder, and the external member manufacturer purchased it and installed it on the external member. A method of attaching to a metal shaft and using it is common. That is, the manufacturer of the external member and the manufacturer of the torque limiter are generally different.

  In order to configure a torque limiter without a metal shaft, a conventionally used method is to provide a sleeve instead of a metal shaft, and extend the sleeve in the axial direction to the outside of the casing. In this method, the end of the casing or the lid of the casing is rotatably supported.

  A conventional torque limiter of this type using a hysteresis torque for a paper feeding device is proposed in, for example, Japanese Patent Application Laid-Open No. 2004-151867. FIG. 11 shows a torque limiter disclosed in Patent Document 1.

  According to FIG. 11, the torque limiter 41 has an outer rotating body (rotating cylinder) 413 that is connected to a rubber roller 419 of a paper feeding device as an external member via a connecting member 4191, that is, a cylindrical shape on the inner peripheral surface of the casing. A semi-rigid magnetic body 416 is fixed, a permanent magnet 415 is fixed to the outer peripheral surface of a sleeve (rotating shaft) 412 constituting the inner rotating body, and a metal shaft 41S as an output shaft of a driving mechanism such as a motor is connected to the sleeve 412. This is a structure that is inserted through the central hole.

  In such a structure, the inner peripheral portion of the lid body 414 attached to the axial end portion of the outer rotating body 413 rotatably supports the outer peripheral surface of the sleeve 412 via the sliding portion (bearing portion) 41403, whereby the sleeve 412 to permanent magnet 415 and outer rotating body 413 to semi-hard magnetic body 416 are relatively rotatable concentrically.

A pin member 41P is provided on the metal shaft 41S. A groove 417 is provided in the extending portion of the sleeve 412 that extends from the housing constituted by the outer surface of the outer rotating body 413 and the lid body 414. The pin member 41 </ b> P is engaged with the groove 417 in the extended portion outside the housing. In such a structure, the metal shaft 41S and the sleeve 412 are integrally rotated by retrofitting the sleeve to the metal shaft outside the housing.
Japanese Patent Laid-Open No. 10-306832

  By the way, in the structure in which the sleeve is extended to the outside of the housing as in the above prior art, the following problems occur with respect to the bearing portion that rotatably supports the sleeve.

  That is, in order to obtain a torque limiter that transmits a predetermined torque between the inner rotating body and the outer rotating body by the hysteresis torque generated between the permanent magnet and the semi-hard magnetic body, the sleeve is rotatably supported and the outer rotating body is attached to the outer rotating body. It is important that the sliding portion where the inner peripheral portion of the lid body to be attached and the outer peripheral surface of the sleeve are in contact with each other is formed smoothly and the sliding characteristics of the sliding portion are good. If the sliding characteristics of the sliding portion are deteriorated, the sleeve and the outer rotator are caused to rotate unevenly, resulting in fluctuations in the torque value, and a predetermined torque that is stable over a long period of time cannot be obtained.

  According to the torque limiter 41 shown in FIG. 11, the sleeve 412 is formed of a resin member or a metal member. Since the resin sleeve has inferior thermal conductivity, when the torque limiter is heated at high speed and high torque, the temperature rise in the sleeve 412 and the frictional heat generated on the sliding surface of the sliding portion 41403 are generated by the sleeve 412. Accumulate on the surface. The frictional heat of the accumulated resin sleeve 412 changes the friction coefficient of the inner peripheral portion of the lid body 414, that is, the bearing portion. Therefore, the sliding characteristic of the resin sleeve changes, which causes torque value fluctuations. .

  Further, since the resin member has a large dimensional change due to thermal expansion and moisture absorption, the clearance of the bearing portion that rotatably supports the sleeve 412 changes, or the gap between the permanent magnet 415 and the semi-hard magnetic body 416 changes. Therefore, the torque value fluctuates.

  On the other hand, since the metal member is excellent in thermal conductivity and dimensional stability, the above-mentioned drawbacks of the resin sleeve can be avoided. However, if the sleeve 412 is made of a metal member, the sleeve 412 has a more complicated shape than the shaft, and a central hole is required to pass through the metal shaft 41S provided in the external member. The drawing method cannot be adopted as the processing method, and is generally formed by casting or lathe processing.

  Since the metal sleeve 412 formed by casting or lathe processing has poor surface properties, the frictional resistance of the bearing portion that rotatably supports the sleeve 412 increases, which causes torque value fluctuations. If the surface of the metal sleeve 412 is subjected to high-precision processing such as polishing, such a problem can be solved, but this causes the manufacturing / assembling time and manufacturing cost of the torque limiter 41 to increase.

  Therefore, the inventor of the present application, in the conventional torque limiter 41 shown in FIG. 11, has a configuration in which the sleeve 412 and the outer rotating body 413 are relatively rotatable, and a configuration in which the metal shaft 41S and the sleeve 412 are integrally rotatable. In order to avoid the disadvantages of the conventional torque limiter 41 of the resin and metal sleeve 412, the bearing member directly supports the metal shaft instead of the conventional method in which the bearing member rotatably supports the sleeve. Adopted a method to support it freely. In this way, the metal shaft provided on the external member is generally manufactured by drawing and has good surface properties, so the relative rotation with the outer rotating body is extremely good and the sliding characteristics are stable. In addition, it is possible to obtain a configuration with less variation in torque value.

  However, when the method in which the bearing member directly supports the metal shaft in a freely rotatable manner is adopted, the sleeve is accommodated inside the housing and does not have an extending portion to the outside. To attach this type of torque limiter to the shaft, open one end in the axial direction of the torque limiter, insert the metal shaft into the center hole of the sleeve accommodated in the outer rotating body, and attach the metal shaft inside the housing. It is fixed to the sleeve so that the sleeve and the metal shaft can rotate integrally. Finally, in order to close the opening of the torque limiter, a process such as attaching a lid or bearing member to the outer rotating body is required. .

  For this reason, the complicated process of attaching the lid or bearing member to the outer rotating body is carried out by a person involved in the parts manufacturer, such as the torque limiter manufacturer / distributor, its agent, or the purchaser himself / herself. Must be implemented. This does not satisfy the needs of manufacturers of external members who purchase a torque limiter and attach and use it on a shaft provided on the external member. That is, a sales form in which the torque limiter is sold without a shaft cannot be taken.

  Accordingly, the present invention has been created in view of the above circumstances, and provides a torque limiter that has a small torque value variation, can be sold without a shaft, and can be easily assembled or attached to the shaft on the external member side. With the goal.

In order to solve the above-mentioned problem, the invention of claim 1 is provided with a first rotating body that includes a permanent magnet at least on the outer peripheral surface, has a central hole through which the shaft is inserted, and rotates integrally with the shaft, and the permanent magnet. A semi-rigid magnetic body disposed at least on the inner peripheral surface thereof, a second rotating body rotatable relative to the first rotating body, and a shaft disposed at an axial end of the second rotating body The first rotating body has a groove that can be engaged with a radially outward projecting portion provided on a shaft at at least one axial end, and the bearing member is The second rotating body is fixed to the outer peripheral portion, the projecting portion of the shaft can be advanced and retracted on the inner peripheral portion, and a cutout portion formed to be connectable with an external member is provided, and the first rotating body is inserted through the shaft. And the second rotating body are held concentrically to support the shaft rotatably It is characterized in.

According to a second aspect of the present invention, a permanent magnet is provided on at least the outer peripheral surface, a center hole through which the shaft is inserted, a first rotating body that rotates integrally with the shaft, and a semi-rigid member that is disposed opposite the permanent magnet. A second rotating body provided with at least an inner peripheral surface of a magnetic body and rotatable relative to the first rotating body; and a shaft bearing member disposed at an axial end of the second rotating body. The first rotating body has grooves that can be engaged with radially outward projecting portions provided on a shaft at both axial ends, and the bearing member has the second rotating body on an outer peripheral portion. Fixed, provided with a notch formed on the inner periphery so that the protruding part of the shaft can be advanced and retracted and connected to an external member, and when the shaft is inserted, the first rotating body and the second rotating body are held concentrically. The shaft is rotatably supported.

  According to the present invention, a permanent magnet is provided at least on the outer peripheral surface, has a central hole through which the shaft is inserted, and a first rotating body that rotates integrally with the shaft, and a semi-rigid magnetic body that is disposed to face the permanent magnet. At least on the inner peripheral surface, and a second rotating body that is rotatable relative to the first rotating body, and a shaft bearing member disposed at an axial end of the second rotating body. Since the shaft is rotatably supported, the following advantageous torque limiter can be obtained as compared with the conventional structure in which the sleeve is rotatably supported.

  In other words, a shaft made of a solid round bar with a small outer diameter, a simple shape and structure has good surface properties and high manufacturing accuracy by drawing, so friction between the shaft and the bearing member can be obtained. The resistance can be reduced by improving the torque value fluctuation, in other words, the torque variation is small, the stable torque transmission is performed, the hysteresis effect is large, the cogging (sound) is smooth and reliable High torque limiter.

  The first rotating body has a groove that can be engaged with a radially outward projecting portion provided on the shaft at at least one axial end, and the bearing member fixes the second rotating body to the outer peripheral portion. In addition, since the inner peripheral portion is provided with a notch portion in which the projecting portion of the shaft can advance and retreat, the mounting process of the bearing member to the second rotating body is performed by the parts manufacturer in the assembly process of the torque limiter of the present invention. be able to. This eliminates the need for the purchaser himself / herself of the torque limiter of the present invention to attach the bearing member to the second rotating body, thereby satisfying the needs of the manufacturer of the external member.

  Further, according to the structure of the present invention, the purchaser himself attaches the torque limiter of the present invention to the shaft provided on the external member, and the protruding portion of the shaft becomes the groove of the first rotating body inside the housing of the torque limiter. By engaging, the shaft and the first rotating body can rotate integrally, and the shaft is directly supported rotatably by the bearing member. As a result, the first rotating body and the second rotating body are held concentrically. As a result, relative rotation is possible.

  Accordingly, a compact torque limiter that is shorter in the axial direction than the conventional torque limiter in which the pin member of the shaft is engaged with the groove of the first rotating body outside the housing can be obtained. Thereby, a torque limiter that can be configured and sold without a shaft can be obtained.

  Since the notch portion of the bearing member is formed to be connectable to the external member, the connection portion of the external member can be engaged with the notch portion of the bearing member. Thereby, compared with the torque limiter of the conventional structure in which the pin member of the shaft engages with the groove of the first rotating body outside the housing, the installation place and the installation space for the connecting part of the external member can be omitted. A compact external member can be realized.

  Since the first rotating body has grooves at both ends in the axial direction, the torque limiter of the present invention can be attached to the shaft from either side of both ends in the axial direction.

  Since the bearing members are disposed at both ends in the axial direction of the second rotating body, the shaft is rotatably supported by the two bearing members. Thereby, more stable torque transmission is performed, and a more reliable torque limiter can be obtained.

  According to the assembling method of the present invention, at least an outer peripheral surface is provided with a permanent magnet, a center hole through which the shaft is inserted, a groove at the axial end, and a semi-rigid magnetic body at least inside. The outer peripheral portion is fixed to the second rotating body provided on the peripheral surface and the axial end of the second rotating body, and the shaft can be moved forward and backward, and the radially outward projecting portion provided in the shaft can be advanced and retracted In a torque limiter assembling method comprising a bearing member having a notch portion formed on the inner peripheral portion, first, the outer peripheral portion of the first bearing member is fixed to one axial end portion of the second rotating body, and then The first rotating body is inserted into the second rotating body from the other axial end of the second rotating body, and finally the outer peripheral portion of the second bearing member is fixed to the other axial end of the second rotating body. Thus, the following advantageous torque limiter can be obtained.

  That is, when the assembled torque limiter is attached to the shaft, the first rotating member and the second rotating member are concentrically held by the first bearing member and the second bearing member, and the shaft is rotatably supported. Thereby, the torque limiter with a simple attachment process to a shaft can be obtained. This also provides a torque limiter that can be configured and sold without a shaft.

  Next, a first embodiment of the torque limiter of the present invention will be described with reference to the drawings. 1 shows an overall cross-sectional view of the first embodiment, FIG. 2 shows a side view of the whole of FIG. 1 seen from the right direction, and FIG. 3 shows a side view of the whole of FIG. 1 seen from the left side. .

  The torque limiter 1 shown in FIG. 1 incorporates a first rotating body 2 that forms a cylindrical inner rotating body into a second rotating body 3 that forms a cylindrical outer rotating body, and the two rotating bodies 2 and 3 are relative to each other. It is configured to be rotatable. Both rotating bodies 2 and 3 are concentrically held by attachment to a shaft S described later.

  The first rotating body 2 has a center hole 202 through which a shaft S (not shown) is inserted, is provided with a flange 204 at one end 203 in the axial direction, a recess 205 is provided on the outer periphery, and both ends 203, 203 in the axial direction. The first and second grooves 7a and 7b are formed. An O-ring 8 is fitted in the recess 205.

  When the shaft S is inserted through the center hole 202 of the first rotating body 2, the pin member P provided on the shaft S is provided with first and second grooves 7 a and b provided at both axial end portions 203 and 203 of the first rotating body 2. Is engaged with one of the second grooves 7b (see FIG. 4). A cylindrical permanent magnet 5 is fixed to the outer peripheral surface 201 of the first rotating body 2.

  The 2nd rotary body 3 is comprised with the semi-rigid magnetic body 6 with the whole cylinder. The semi-hard magnetic body 6 faces the permanent magnet 5, and the inner peripheral surface 301 of the semi-hard magnetic body 6 and the outer peripheral surface 501 of the permanent magnet 5 with the shaft S inserted into the first rotating body 2. A predetermined gap G is maintained between the two.

  In addition, annular first and second bearing members 4 a and b are fixed to the inner peripheral surface 301 of the semi-hard magnetic body 6 at the outer peripheral portion 402 at both axial end portions 302 and 302 of the second rotating body 3. Yes.

As shown in FIGS. 2 and 3, a pin member P protruding radially outward from the outer peripheral surface of the shaft S can enter and leave the inner peripheral portion 403 of the first and second bearing members 4 a and b. A hole 403 ′ having a notch 404 is formed in the radial direction. First, inner diameter of the second bearing member 4a, b of the inner peripheral portion 403 is formed so as to substantially coincide with the outer diameter of the shaft S.

  When the shaft S and the pin member P enter the hole 403 ′ having the notch portion 404 of the first or second bearing member 4a, b and are inserted into the center hole 202 of the first rotating body 2, the shaft S is The bearings are rotatably supported by the inner peripheral portions 403 of the first and second bearing members 4a, b (see FIG. 4). At that time, since the pin member P engages one of the first and second grooves 7a, b of the first rotating body 2, the shaft S can rotate integrally with the first rotating body 2.

Next, an example of the assembly and attachment process of the first embodiment of the present invention will be described.
First, the O-ring 8 is mounted in the recess 205 provided on the outer periphery of the first rotating body 2. The O-ring 8 prevents rattling between the first rotating body 2 and the magnetic member of the permanent magnet 5.

  Next, the permanent magnet 5 is inserted into the outer peripheral surface 201 of the first rotating body 2 and fixed. On the other hand, the outer peripheral portion 402 of the first bearing member 4a is inserted into and fixed to the inner peripheral surface 301 of the semi-hard magnetic body 6 at one axial end portion 302 of the second rotating body 3. In any case, it is not limited to adhesion, and may be fixed by using pressure bonding or other fixing means.

  Further, the first rotating body 2 is inserted into the second rotating body 3 from the other axial end portion 302 of the second rotating body 3, and the semi-rigid magnetic material is similarly applied to the second axial end portion 302 of the second rotating body 3. The outer peripheral portion 402 of the second bearing member 4b is inserted into the inner peripheral surface 301 of the body 6 and fixed.

  Finally, the shaft S having the pin member P is formed in the inner peripheral portion 403 of the first bearing member 4a and the second bearing member 4b assembled by the assembly process, and the hole 403 ′ having the notch 404 is formed. It is made to enter one side and is inserted through the center hole 202 of the first rotating body 2 to penetrate the center hole 202.

  The shaft S having the pin member P is provided on the external member 9 such as a motor as an output shaft of a drive mechanism such as a motor. The attaching process of the torque limiter 1 assembled by the above assembling process to the shaft S is as follows. It can be easily implemented by the purchaser himself.

  The torque limiter 1 after the assembly process and the mounting process are completed in the housing, that is, the first bearing member 4a and the second bearing member 4b, the shaft S and the first rotating body 2 are formed of the pin portion P material and the groove 7. While being fixed by engagement, both bearing members 4a and 4b rotatably support the shaft S.

  FIG. 4 shows that a shaft S having a pin member P is inserted into a hole 403 ′ formed in the inner peripheral portion 403 of the second bearing member 4 b and is inserted through the center hole 202 of the first rotating body 2 to penetrate the center hole 202. In the housing, the pin member P is engaged with the second groove 7b.

  As shown in FIG. 4, a connecting portion 91 formed on the external member 9 is engaged with the notch portion 404 provided in the hole 403 ′ of the second bearing member 4 b. A similar connecting portion 91 can also engage with a notch 404 provided in the hole 403 'of the first bearing member 4a.

  Next, a second embodiment of the torque limiter of the present invention will be described with reference to the drawings. FIG. 5 shows an overall cross-sectional view of the second embodiment, FIG. 6 shows a side view of the whole of FIG. 5 viewed from the right direction, and FIG. 7 shows a side view of the whole of FIG. . In addition, the same code | symbol is attached | subjected and demonstrated to the same or equivalent part as 1st embodiment.

  The torque limiter 21 shown in FIG. 5 is changed from the first rotating body 2 composed entirely of a cylindrical permanent magnet 5 to the second rotating body 3 composed entirely of a cylindrical semi-hard magnetic body 6. The built-in and both rotating bodies 2 and 3 are configured to be relatively rotatable. Both rotating bodies 2 and 3 are concentrically held by attachment to a shaft S described later. The semi-rigid magnetic body 6 is opposed to the permanent magnet 5 and is formed between the inner peripheral surface 301 of the semi-hard magnetic body 6 and the outer peripheral surface 501 of the permanent magnet 5 with the shaft inserted into the first rotating body. A predetermined gap G is maintained between them.

  In addition, annular first and second bearing members 4 a and b are inserted into both axial end portions 302 and 302 of the second rotating body 3, and the outer peripheral portion 402 is formed on the inner peripheral surface 301 of the semi-hard magnetic body 6. It is fixed. Further, the groove 7 is formed in the axial end portion 203 of the first rotating body 2, that is, on the first bearing member 4a side. As shown in FIGS. 5 to 7, the other components are the same as those in the first embodiment.

Next, an example of the assembly and attachment process of the second embodiment of the present invention will be described.
First, the first bearing member 4a or the second bearing member 4b is inserted into the inner peripheral surface 301 of the semi-hard magnetic body 6 at one axial end portion 302 of the second rotating body 3, and the outer peripheral portion 402 is fixed.

  Next, the first rotator 2 is inserted into the second rotator 3 from the other axial end 302 of the second rotator 3, and similarly semi-rigid at the other axial end 302 of the second rotator 3. The second bearing member 4b or the first bearing member 4a is inserted into the inner peripheral surface 301 of the magnetic body 6, and the outer peripheral portion 402 is fixed.

  Finally, the shaft S having the pin member P is formed in the inner peripheral portion 403 of the first bearing member 4a and the second bearing member 4b assembled by the assembly process, and the hole 403 ′ having the notch 404 is formed. It is made to enter one side and is inserted through the center hole 202 of the first rotating body 2 to penetrate the center hole 202. Thereby, the pin member P provided on the shaft S in the housing is engaged with the groove 7 formed in the first rotating body 2.

  In the torque limiter 21 shown in FIG. 5, the entire first rotating body 2 is composed of the permanent magnet 5, and the assembly process of the permanent magnet is omitted. Therefore, the finished dimensional accuracy is improved as compared with the first embodiment. .

  In addition, the connection part 91 formed in the external member 9 can engage with any notch part 404 provided in the hole 403 'of the first bearing member 4a and the second bearing member 4b (see FIG. 4). Further, the axial end portion 203 of the first rotating body 2, that is, the groove 7 formed on the first bearing member 4a side may be formed on both sides of the first bearing member 4a and the second bearing member 4b, respectively.

  Next, a third embodiment of the torque limiter of the present invention will be described with reference to the drawings. 8 shows an overall cross-sectional view of the third embodiment, FIG. 9 shows a side view of the whole of FIG. 8 seen from the right direction, and FIG. 10 shows a side view of the whole of FIG. 8 seen from the left direction. . In addition, the same code | symbol is attached | subjected and demonstrated to the same or equivalent part as 1st embodiment.

  The torque limiter 31 shown in FIG. 8 is configured such that the first rotating body 2 is incorporated in the second rotating body 3 and the rotating bodies 2 and 3 are relatively rotatable. Both rotating bodies 2 and 3 are concentrically held by attachment to a shaft S described later. The semi-rigid magnetic body 6 that is pressure-bonded to the inner peripheral surface 301 ′ of the second rotating body 3 by an assembly process described later faces the permanent magnet 5 bonded to the outer peripheral surface 201 of the first rotating body 2, and A predetermined gap G is maintained between the inner peripheral surface 301 of the semi-hard magnetic body 6 and the outer peripheral surface 501 of the permanent magnet 5 with the shaft S inserted in the first rotating body 2.

  Further, the outer peripheral portions 402 of the annular first and second bearing members 4a and b and the side peripheral surface 61 of the semi-hard magnetic body 6 are provided at both axial end portions 302 and 302 of the second rotating body 3, respectively. The two-rotor 3 is crimped by an inward flange portion 303. Further, the groove 7 is formed in the axial end portion 203 of the first rotating body 2, that is, on the first bearing member 4a side. As shown in FIGS. 8 to 10, the other components are the same as those of the first embodiment.

Next, an example of the assembly and attachment process of the third embodiment of the present invention will be described.
First, the O-ring 8 is mounted in the recess 205 provided on the outer periphery of the first rotating body 2. On the other hand, the 2nd rotary body 3 is comprised, and the inward flange part 303 is formed by crimping using the jig | tool at the one end part of the cylindrical casing 300 which the axial direction both ends 302 and 302 open.

  Next, the permanent magnet 5 is inserted into the outer peripheral surface 201 of the first rotating body 2 and fixed. On the other hand, the second bearing member 4 b and the cylindrical semi-hard magnetic body 6 are inserted into the cylindrical casing 300 of the second rotating body 3 from the other axial end 302. Further, the first rotating body 2 is inserted into the second rotating body 3 from the other axial end 302 of the second rotating body 3.

  Furthermore, the first bearing member 4a is inserted into the second rotating body 3 from the other axial end 302, and subsequently, an inward flange portion 303 is formed by caulking at the other end of the cylindrical casing 300. Thus, the semi-rigid magnetic body 6 and the first and second bearing members 4 a and b are pressure-bonded to the second rotating body 3.

  Finally, the shaft S having the pin member P is formed in the inner peripheral portion 403 of the first bearing member 4a assembled by the above-described assembly process, and is made to enter the hole 403 ′ having the notch portion 404, and the first rotating body. The center hole 202 is inserted through the second center hole 202. Thereby, the pin member P provided on the shaft S in the housing is engaged with the groove 7 formed in the first rotating body 2.

  In addition, the connection part 91 formed in the external member 9 can engage with any notch part 404 provided in the hole 403 'of the first bearing member 4a and the second bearing member 4b (see FIG. 4). Further, the axial end portion 203 of the first rotating body 2, that is, the groove 7 formed on the first bearing member 4a side may be formed on both sides of the first bearing member 4a and the second bearing member 4b, respectively.

  In the illustrated first to third embodiments of the present invention, the torque limiter has been described in which the first rotating body 2 includes the permanent magnet 5 and the second rotating body 3 includes the semi-hard magnetic body 6. Instead, a torque limiter may be used in which the first rotating body 2 includes the semi-hard magnetic body 6 and the second rotating body 3 includes the permanent magnet 5.

1 is an overall cross-sectional view of a first embodiment of the present invention. The side view which looked at the whole of FIG. 1 from the right direction. The side view which looked at the whole of FIG. 1 from the left direction. The whole sectional view showing the state where the shaft was inserted in the first embodiment, and the connecting part of the external member was engaged. The whole sectional view of a second embodiment of the present invention. The side view which looked at the whole of FIG. 5 from the right direction. The side view which looked at the whole of FIG. 5 from the left direction. The whole sectional view of a third embodiment of the present invention. The side view which looked at the whole of FIG. 8 from the right direction. The side view which looked at the whole of FIG. 8 from the left direction. The whole sectional view of a conventional example.

Explanation of symbols

1, 21 and 31 ... Torque limiter 2 ... 1st rotating body 3 ... 2nd rotating body 4 ... Bearing member 4a ... 1st bearing member 4b ... 2nd bearing member 5 ... Permanent magnet 6 ... Semi-hard magnetic body 7 ... Groove 7a 1st groove 7b 2nd groove 9 External member 201 Outer peripheral surface of first rotating body 202 Central hole of first rotating body 203 End end of first rotating body 301 Peripheral surface 302 ... Axial end of second rotating body 402 ... Outer peripheral part of bearing member 403 ... Inner peripheral part of bearing member 403 '... Hole in bearing member 404 ... Notch part of bearing member S ... Shaft G ... With permanent magnet Gap with semi-hard magnetic material P ... Pin member

Claims (2)

A first rotating body provided with at least an outer peripheral surface of a permanent magnet, having a central hole through which the shaft is inserted, and rotating integrally with the shaft;
A semi-rigid magnetic body disposed opposite to the permanent magnet at least on the inner peripheral surface, and a second rotating body rotatable relative to the first rotating body;
A shaft bearing member disposed at an axial end of the second rotating body,
The first rotating body has a groove that can be engaged with a radially outward projecting portion provided on a shaft at at least one axial end portion;
The bearing member includes a notch portion that fixes the second rotating body on an outer peripheral portion and receives a protruding portion of the shaft in an inner peripheral portion so as to be able to advance and retreat, and the notch portion engages with an external member to form the second The rotating body and the external member are formed so as to be integrally connectable, and when the shaft is inserted, the first rotating body and the second rotating body are held concentrically and the shaft is rotatably supported. Torque limiter. A first rotating body provided with at least an outer peripheral surface of a permanent magnet, having a central hole through which the shaft is inserted, and rotating integrally with the shaft;
A semi-rigid magnetic body disposed opposite to the permanent magnet at least on the inner peripheral surface, and a second rotating body rotatable relative to the first rotating body;
A shaft bearing member disposed at an axial end of the second rotating body,
The first rotating member has a protrusion engageable with the groove of the radially outward provided on the shaft in both axial end portions,
The bearing member includes a notch portion that fixes the second rotating body on an outer peripheral portion and receives a protruding portion of the shaft in an inner peripheral portion so as to be able to advance and retreat, and the notch portion engages with an external member to form the second The rotating body and the external member are formed so as to be integrally connectable . When the shaft is inserted, the first rotating body and the second rotating body are concentrically held and the shaft is rotatably supported. Torque limiter.

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