JP2013245768A - Electromagnetic coupling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic coupling device allowing work for assembling a fixed disc to a hub to be performd smoothly and appropriately, and enabling automation of the assembly work.SOLUTION: An outer circumferential surface of a hub 3 is provided with: spline tooth bodies 8 formed with a plurality of hub-side spline teeth 31 capable of spline coupling with spline teeth formed at an inner circumferential edge of a fixed disc, in a circumferential direction, at least one or more hub-side spline teeth 31 meshing with fixed disc-side spline teeth adjacent circumferentially in an assembled state; and insertion guide parts 9 each provided, in a position continued to the spline tooth body 8 and on an insertion end side than the spline tooth body 8. The guide part 9 is formed using: a radially-inclined surface 91 which is inclined in a radial direction of the hub 3; and a circumferentially-inclined surface 92 which is inclined in a circumferential direction of the hub 3.

Description

  The present invention can switch between a state where the braking force is applied (a state where the brake torque can be transmitted) and a state where the brake force is not applied depending on whether it is in an excited state, or a state where the rotational torque can be transmitted. The present invention relates to an electromagnetic coupling device that can be switched between impossible states.

  Non-excitation actuated brake in which braking force is applied by the biasing force of a spring or the like in the non-excited state or the force of a permanent magnet, excitation actuated brake configured so that the braking force is activated by magnetic attraction in the excited state, or in the non-excited state The non-excitation actuated clutch configured to transmit the rotational torque by the biasing force of the spring or the like or the force of the permanent magnet, or the excitation actuated clutch configured to transmit the rotational torque by the magnetic attractive force in the excited state An electromagnetic coupling device is known.

  In these various electromagnetic coupling devices, a hub is fixed to the outer peripheral surface of the shaft so as to be integrally rotatable, and a brake disc is assembled to the hub by spline coupling (spline engagement) if it is a brake, or if it is a clutch. The clutch plate is assembled by spline coupling. These brake discs and clutch plates are immovable in the axial direction of the shaft when assembled to the hub, and these discs such as brake discs or clutch plates (hereinafter referred to as “fixed discs”) along the axial direction of the shaft. An electromagnetic coupling device provided with a disk such as an armature or a clutch plate (hereinafter referred to as a “movable disk”) opposed to the movable disk moves in the axial direction of the shaft in accordance with the excitation state, thereby moving the fixed disk and the fixed disk. It is configured to be able to switch between a state in which brake torque or rotational torque (hereinafter simply referred to as “torque”) is transmitted to the disk and a state in which torque is not transmitted (brake disk). (See Patent Document 1 as an example of splined to the hub).

JP 2011-112100 A

  The fixed disk is assembled to the hub by inserting an annular fixed disk from the insertion end side of the hub, the disk side spline formed on the inner peripheral surface of the fixed disk, and the hub side spline teeth provided on the outer peripheral surface of the hub. By engaging each other. In order to prevent / suppress unwanted rattling at the spline coupling part when it is actually used as an electromagnetic coupling device with the spline teeth meshed together (during operation), The shape of each spline tooth is set so that the gap (backlash) between the spline teeth in the direction is as small as possible.

  By the way, the fact is that the fixed disk is assembled to the hub manually. Specifically, a non-rotating fixed disk is inserted into a non-rotating hub while maintaining a predetermined posture (rotation angle or radial position) where the spline teeth are engaged with each other, and the spline teeth are engaged with each other. By matching, the fixed disk is assembled to the hub so as to be integrally rotatable.

  However, as described above, since the shape of each spline tooth is set so that the gap (backlash) between the spline teeth in the circumferential direction is as small as possible, the fixed disk and the fixed disk at the time of assembling work to the hub. If the relative rotation angle with the hub is different from the predetermined mounting angle, or if the relative radial position between the fixed disk and the hub is different from the predetermined mounting position, the spline teeth of the fixed disk and the spline teeth of the hub Abutting in a state of being aligned in the insertion direction or abutting in a state of being displaced in the radial direction. In the current situation where such a situation can occur, it is difficult to automate the work of assembling the fixed disk to the hub.

  The present invention has been made paying attention to such a problem, and a main object thereof is to perform an operation of assembling the fixed disk to the hub smoothly and appropriately, and to enable the assembly operation to be automated. It is to provide a coupling device.

  That is, the present invention is not movable in the axial direction of the shaft in a state where the hub is fixed to the shaft so as to be integrally rotatable, and is inserted in the axial direction of the shaft from the insertion end side of the hub and assembled by spline coupling (assembled state). A fixed disk, a movable disk capable of moving toward and away from the fixed disk along the axial direction of the shaft, and an electromagnetic contact and separation means for contacting and separating the fixed disk and the movable disk from each other. The present invention relates to an electromagnetic coupling device that presses a disk against a fixed disk to realize torque transmission between a hub-side fixed disk and a movable disk. Here, specific examples of the electromagnetic coupling device of the present invention include a non-excitation operation type brake, an excitation operation type brake, a non-excitation operation type clutch, and an excitation operation type clutch. “Pressing” means pressing and pressing in a contact state.

  In the electromagnetic coupling device of the present invention, a plurality of hub-side spline teeth that can be splined with a disk-side spline tooth formed on the inner peripheral surface of the fixed disk are formed on the outer peripheral surface of the hub in the circumferential direction. The spline teeth main body meshes with the disk side spline teeth adjacent in the circumferential direction in the assembled state in the assembled state, and the insertion provided at the insertion end side of the spline tooth main body and at a position continuous to the spline tooth main body. And a guide portion, wherein the insertion guide portion is configured to have a radially inclined surface inclined in the radial direction of the hub and a circumferentially inclined surface inclined in the circumferential direction of the hub.

  With such an electromagnetic coupling device, when the fixed disk is inserted into the hub from the insertion end side of the hub in the axial direction of the shaft and assembled by spline coupling, the actual state of the hub and the fixed disk at the time of inserting the fixed disk into the hub The relative position (relative position in the rotation direction and relative position in the radial direction) is fixed even if there is an error with respect to the normal relative position where the hub-side spline teeth and the fixed disc-side spline teeth mesh properly. By guiding the insertion direction of the fixed disk while bringing the disk side spline teeth into contact with the circumferentially inclined surface or the radially inclined surface of the insertion guide portion of the hub side spline teeth, at least one of the circumferential direction and the radial direction is provided. Error (positional deviation) can be eliminated, and the fixed disc side spline teeth mesh with the spline teeth body of the insertion guide. Together, it is possible to achieve good assembled state with the appropriate spline connection.

  Therefore, with the electromagnetic coupling device according to the present invention, the work of assembling the fixed disk to the hub by spline coupling can be performed smoothly and appropriately, and the work efficiency can be improved by manual work. It becomes possible to automate itself, and work efficiency can be further improved. In addition, all the spline teeth provided on the outer peripheral surface of the hub may have the spline tooth main body and the insertion guide portion described above, or one or more spline teeth appropriately selected from all the spline teeth provided on the outer peripheral surface of the hub. It is good also as what has only the spline tooth | gear main body and insertion guide part which were mentioned above.

  Further, in the electromagnetic coupling device of the present invention, the distal end position of the insertion guide portion is further away from the insertion end of the hub or the vicinity of the insertion end closer to the insertion direction side of the fixed disk, that is, separated from the insertion end of the hub by a predetermined distance. Although it is possible to set the position (a position that does not correspond to the vicinity of the insertion end), it is possible to correct the relative position error (position deviation) as soon as the fixed disk starts to be inserted into the hub. Thus, in order to enhance the effect of correcting misalignment and speed up the assembling work, it is preferable that the distal end of the insertion guide portion is extended and pointed to the insertion end of the hub or the vicinity of the insertion end.

  According to the present invention, when the fixed disk is inserted into the hub from the insertion end side, the fixed disk or hub is moved in the radial direction and the circumferential direction at a position where the fixed disk side spline teeth and the spline tooth main body are engaged with each other by the insertion guide portion. It can be moved or moved in at least one of the radial direction and the circumferential direction, and a good spline coupling state can be ensured. And according to this invention which employ | adopted the technical idea mentioned above, the operation | work which assembles | attaches a fixed disk to a hub can be performed smoothly and appropriately, and the electromagnetic coupling device which can also implement | achieve automation of an assembly | attachment operation | work is provided. it can.

The cross-sectional schematic diagram of the electromagnetic coupling device which concerns on one Embodiment of this invention. The whole hub schematic in the embodiment. FIG. 3 is a partially enlarged view of FIG. 2. FIG. 2 is a view corresponding to FIG. 2 showing a modification of the hub in the embodiment. FIG. 5 is a partially enlarged view of FIG. 4.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  The electromagnetic coupling device X according to the present embodiment is, for example, a dry non-excitation operation type brake in which a braking force (brake torque) acts in a non-excitation state. As shown in FIG. 1, this non-excitation actuated brake X includes an electromagnet portion 1 in which an excitation coil 12 is provided in a yoke 11, and an axial center direction m of a braked shaft S (corresponding to the “shaft” of the present invention). An armature 2 (corresponding to the “movable disk” of the present invention) that can slide along the (thrust direction) and can form a magnetic circuit together with the electromagnet portion 1, and a direction in which the armature 2 is separated from the electromagnet portion 1. An urging member (not shown) for urging, a hub 3 fixed to the outer peripheral surface of the braked shaft S so as to be integrally rotatable, and an axial direction of the braked shaft S assembled to the outer peripheral surface of the hub 3 so as to be integrally rotatable. The brake disc 4 that does not slide along m (corresponding to the “fixed disc” of the present invention), and fixed at a position facing the armature 2 along the axial direction m of the braked shaft S across the brake disc 4 The axial direction m of the braked shaft S Those having a non-slidable plate 5.

  The electromagnetic brake X is configured so that the armature 2 and the plate 5 on which the braked shaft S is loosely fitted to the brake disk 4 that can rotate integrally with the braked shaft S on the braked shaft S are arranged in the axial direction of the braked shaft S. The armature 2 is energized in the axial direction m by energizing the excitation coil 12 and energizing the yoke 11 by energizing the excitation coil 12 so that the relative distance can be varied. 2 presses against each other, and the brake disk 4 and the plate 5 press against each other to realize transmission of torque (brake torque). Here, “pressing” means pressing and pressing in a contacted state.

  In this embodiment, the exciting coil 12, the yoke 11 that can form a magnetic path therein by winding the exciting coil 12 around the axis m, and one end of the concave portion formed in a part of the yoke 11. The “electromagnetic contact / separation means” of the present invention is realized by a biasing member such as a compression spring in which the side region is accommodated and the tip is elastically contacted with the armature 2. In addition, the brake shaft S is configured to be freely inserted in a hole 11a formed in the radial center of the yoke 11.

  The armature 2 has an annular plate shape made of a ferromagnetic material such as iron, for example, and a position in contact with the end surface 11b of the yoke 11 with a bolt (not shown) passing through a through hole formed in a part thereof. 11 is movable in the axial direction m of the braked shaft S between a position separated from the end face 11b by a predetermined distance. The armature 2 is urged in a direction away from the end surface 11b of the yoke 11 by the urging member while the braked shaft S is inserted in a loosely fitted state into a hole 2a formed in the central portion in the radial direction.

  As shown in FIGS. 1 and 2, the hub 3 is formed with a shaft hole 3a into which the braked shaft S can be inserted in the central portion in the radial direction, and the braked shaft S is inserted into the shaft hole 3a to obtain appropriate means. By fixing with, it becomes possible to rotate integrally with the braked shaft S. Hub side spline teeth 31 that mesh with disk side spline teeth 41 (corresponding to the “fixed disk side spline teeth” of the present invention) formed on the inner periphery of the brake disk 4 to be described below are arranged on the outer peripheral surface of the hub 3 in the circumferential direction. It is provided at an equal pitch. The detailed description of the hub side spline teeth 31 will be described later.

  The brake disk 4 has an annular plate shape and is disposed between the armature 2 and the plate 5. The hub side spline teeth 31 are formed on the edge (inner peripheral surface) of the hole formed in the center in the radial direction. 1 (see FIG. 1, the upper half side in FIG. 1 shows a cut surface passing through the hub side spline teeth 31, and the lower half side passes through the disk side spline teeth 41. The cut surface is schematically shown, and in the cross-sectional view on the lower half side, a boundary portion between the disc-side spline teeth 41 and other portions in the brake disc 4 is indicated by a broken line. The disk-side spline teeth 41 are formed at the same time when the brake disk 4 is formed by pressing or punching, for example, and can adopt a known shape. In the present embodiment, the friction material 6 (facing) is attached to the surface of the brake disk 4 facing the armature 2 and the surface facing the plate 5 with an adhesive or the like.

  The plate 5 has an annular plate shape, and the brake shaft S is inserted in a loosely fitted state into a hole 5a formed in the central portion in the radial direction, and bolts and nuts (not shown) are spaced from the end surface 11b of the yoke 11 by a predetermined distance. It is arranged so that it cannot move in the axial direction m of the braked shaft S by a fixing means such as.

  In the electromagnetic coupling device X having such a configuration, when the exciting coil 12 is energized, a magnetic path is formed between the yoke 11 and the armature 2, and the armature 2 is resisted by the elastic force of the biasing member. A magnetic attraction force is generated in a direction to be attracted to the end face 11b. When the armature 2 moves to the yoke 11 side and comes into close contact with the end surface 11b of the yoke 11, the contact state between the brake disc 4 and the armature 2 is released, the brake disc 4 is released, and the brake disc 4 Torque is never transmitted. Further, in the electromagnetic coupling device X of the present embodiment, when the energization to the exciting coil 12 is stopped, the armature 2 is elastically biased by the biasing member and moves away from the end surface 11b of the yoke 11 as a result. The brake disk 4 is sandwiched between the armature 2 and the plate 5 and the brake torque is applied to the brake disk 4 through the sliding friction of the friction material 6 so that the brake disk 4 can rotate integrally with the brake disk 4. A braking force can be applied to the braked shaft S via the hub 3.

  Thus, in the electromagnetic coupling device X that can be switched between the torque transmission state and the torque non-transmission state through switching of the excitation state with respect to the yoke 11, the annular disc brake disc 4 can be rotated integrally with the hub 3. As for the assembly work, the one end of the both ends of the hub 3 is set as the insertion end 3b, the brake disc 4 is inserted from the insertion end 3b side, and the hub side spline teeth 31 and the disk side spline teeth 41 are mutually connected. (Spline coupling).

  By the way, the work of assembling the brake disk 4 to the hub 3 is usually performed manually. That is, the non-rotating hub 3 is inserted into the hub 3 by inserting the non-rotating brake disc 4 from the insertion end 3b of the hub 3 with an appropriate mounting posture, and the hub-side spline teeth 31 and the disk-side spline teeth 41. The brake disc 4 is assembled to the hub 3 by meshing each other. At the time of this insertion work, highly accurate positioning of the brake disc 4 with respect to the hub 3 is required. That is, in the state where the hub side spline teeth 31 and the disk side spline teeth 41 are meshed with each other, in order to prevent or suppress the noise caused by the rattling itself or rattling at the spline coupling portion, it is adjacent in the circumferential direction. The shapes of the hub side spline teeth 31 and the disk side spline teeth 41 are set so that the gap (backlash) between the matching hub side spline teeth 31 and the disk side spline teeth 41 is as small as possible. If the positioning accuracy (absolute deviation between the target position and the actual position) is low, the hub-side spline teeth 31 and the disk-side spline teeth 41 are inserted in the axial direction m or radial direction of the braked shaft S. In this case, the assembly work cannot be performed smoothly and properly.

  Therefore, in the electromagnetic coupling device X according to the present embodiment, as shown in FIGS. 1 to 3 (FIG. 3 is a partially enlarged view of FIG. 2), the hub-side spline teeth 31 are circumferential in the assembled state. A spline tooth main body 8 that meshes with the disc-side spline teeth 41 adjacent to each other, and an insertion guide portion 9 that is located at a position continuous with the spline tooth main body 8 and closer to the insertion end 3b side of the hub 3 than the spline tooth main body 8. I have applied what I have. In addition, in the cross-sectional view on the upper half side of FIG. 1, a boundary portion between the spline tooth main body 8 and the insertion guide portion 9 is indicated by a broken line.

  Each spline tooth main body 8 extends in the axial direction m, for example, has a trapezoidal shape when viewed from the axial direction m (front view). Specifically, the outer surface of the spline tooth body 8 includes a flat radially outward surface 81 that defines a tooth length, which is the radial length of the spline tooth body 8, and both circumferential edges of the radially outward surface 81. And a pair of flat circumferential facing surfaces 82 that define a tooth thickness that is a circumferential dimension of the spline tooth main body 8. In addition, the shape of the spline tooth main body 8 can be appropriately changed according to the shape of the disk-side spline teeth 41, and a known shape can be applied.

  Each insertion guide portion 9 has a radial inclined surface 91 inclined in the radial direction of the hub 3 and a circumferential inclined surface 92 inclined in the circumferential direction of the hub 3.

  In the present embodiment, the radially inclined surface 91 is gradually dimensioned in the radial direction from the edge on the insertion end 3 b side of the hub 3 to the insertion end 3 b of the hub 3 on the radially outward surface 81 of the spline tooth body 8. Is formed by a flat radial taper surface set to be small. In the present embodiment, the tooth depth at the edge (tip) of the hub 3 on the insertion end 3b side of the radially inclined surface 91 is set to be about two thirds of the tooth depth of the spline tooth main body 8. However, this value can be changed as appropriate. Further, as the radially inclined surface 91 of the present embodiment, the tip extending toward the insertion end 3b of the hub 3 is sharpened, and the boundary portion between the radially inclined surface 91 and the radially outward surface 81 of the spline tooth main body 8 is included. Applying an isosceles triangle shape in which the angle formed by the sides (two sides along the two circumferential edges of the radially inclined surface 91) from both ends of the side along the axis is the apex angle doing.

  In addition, the circumferentially inclined surface 92 is steeper in the circumferential direction than the circumferentially opposed surface 82 of the spline tooth body 8 described above from both circumferential edges of the radially inclined surface 91 to the outer peripheral surface of the hub 3. It is formed by an inclined flat circumferential taper surface.

  In the present embodiment, each insertion guide portion 9 is configured by using one radial inclined surface 91 and a pair of circumferential inclined surfaces 92 opposed in the circumferential direction with the radial inclined surface 91 interposed therebetween. The dimension of the portion corresponding to the tooth thickness in the insertion guide portion 9 defined by the pair of circumferentially inclined surfaces 92 gradually decreases toward the insertion end 3 b side of the hub 3.

  Then, the brake disc 4 is applied to the hub 3 having hub-side spline teeth 31 formed on the outer peripheral surface at equal pitches by continuously forming such insertion guide portions 9 on the spline tooth body 8 in the axial direction m. When the brake disc 4 is inserted into the hub 3, the actual relative position (relative rotational angle and relative position in the radial direction) of the hub 3 and the brake disc 4 is the hub side spline teeth 31 and the disc side spline teeth. Even if there is an error with respect to a normal relative position that should be a target with which 41 engages, the error is absorbed by the action of the insertion guide portion 9, and the spline tooth main body 8 and the disk side spline of the hub side spline teeth 31 are absorbed. The teeth 41 can be smoothly meshed with each other.

  The operation of the insertion guide portion 9 will be described in detail. That is, when the brake disk 4 is assembled, the actual relative position (relative position in the rotational direction and relative position in the radial direction) of the hub 3 and the brake disk 4 at the time when the brake disk 4 is inserted into the hub 3 is the above-mentioned regularity. When there is an error with respect to the relative position, when the brake disc 4 is inserted into the hub 3 to some extent from the insertion end 3b side of the hub 3, the disc-side spline teeth 41 hit the insertion guide portion 9 of the hub-side spline teeth 31, and remain as they are. When the brake disc 4 is further inserted, the disc-side spline teeth 41 are guided to a position where they are engaged with the spline tooth main body 8 while being in contact with the radial inclined surface 91 and the circumferential inclined surface 92 of the insertion guide portion 9. . As a result, as long as the brake disc 4 is inserted into the hub 3 from the insertion end 3b side, the brake disc 4 is moved radially and circumferentially to a position where the disc-side spline teeth 41 and the spline tooth main body 8 are engaged with each other. Or can be moved in at least one of the radial direction and the circumferential direction, and a good spline coupling state can be ensured.

  Here, when the actual relative position of the hub 3 and the brake disk 4 at the time of inserting the brake disk 4 into the hub 3 has an error in the circumferential direction and the radial direction with respect to the above-described normal relative position, the insertion work Accordingly, the disk-side spline teeth 41 are guided to a position where they are engaged with the spline tooth main body 8 while being in contact with both the circumferentially inclined surface 92 and the radially inclined surface 91 of the insertion guide portion 9. Further, when the actual relative position of the hub 3 and the brake disk 4 at the time of inserting the brake disk 4 into the hub 3 has an error only in the circumferential direction with respect to the above-mentioned normal relative position, The disc-side spline teeth 41 are guided to a position where the disc-side spline teeth 41 engage with the spline tooth main body 8 while being in contact with the circumferentially inclined surface 92 of the insertion guide portion 9. When the actual relative position of the brake disk 4 has an error only in the radial direction with respect to the above-mentioned normal relative position, the disk-side spline teeth 41 are moved in the radial inclined surface 91 of the insertion guide portion 9 along with the insertion operation. It is guided to a position where it engages with the spline tooth main body 8 while being in contact with. If the actual relative position of the hub 3 and the brake disk 4 at the time of inserting the brake disk 4 into the hub 3 is not different from the above-mentioned normal relative position, the disk-side spline teeth 41 are moved along with the insertion work. The insertion guide portion 9 does not come into contact with the circumferentially inclined surface 92 or the radially inclined surface 91, or reaches a position where it is engaged with the spline tooth body 8 while slightly contacting (attaching).

  With such an electromagnetic coupling device X according to the present embodiment, the work of assembling the brake disk 4 to the hub 3 by spline coupling can be performed smoothly and appropriately, and the work efficiency is improved manually. In addition, the assembly work itself can be automated, which greatly contributes to further improvement of work efficiency.

  In addition, this invention is not limited to embodiment mentioned above. For example, in the above-described embodiment, an example in which all the hub-side spline teeth formed on the outer peripheral surface of the hub are provided with the spline tooth main body and the insertion guide portion is exemplified. It is also possible to provide an insertion guide portion only for the hub side spline teeth selected at a ratio of one, and to set the other hub side spline teeth to a known shape consisting of only the spline tooth main body. . As an example, a configuration in which an insertion guide portion is provided only on three hub side spline teeth (three hub side spline teeth spaced apart from each other by 120 degrees in the circumferential direction) located at equal intervals in the circumferential direction. Can be mentioned.

  Moreover, each inclination angle of the radial direction inclined surface and circumferential direction inclined surface of an insertion guide part can be changed suitably. Moreover, you may form the radial direction inclined surface and circumferential direction inclined surface of an insertion guide part by surfaces other than a taper surface, for example, a curved surface, or the surface which combined the curved surface and the taper surface.

  Furthermore, as the insertion guide portion, a tip having a sharpened tip end extended to the insertion end of the hub or the vicinity of the insertion end can be applied. Specifically, as the shape of the distal end portion of the insertion guide portion 9 as described above, the distal ends of the radial inclined surface and the circumferential inclined surface described above are gathered toward one point set at or near the insertion end of the hub. As shown in FIGS. 4 and 5, the insertion end 3 b of the hub 3 or the vicinity of the insertion end 3 b is further set from the distal ends of the radial inclined surface 91 and the circumferential inclined surface 92. A conical shape (partial conical shape) that extends toward the single point 9T and has the single point 9T as a vertex can be exemplified. In this way, the distal end portion 93 of the insertion guide portion 9 is extended to the insertion end 3b of the hub 3 or in the vicinity of the insertion end 3b, and the distal end shape is conical or partially pyramid (a predetermined surface passing through the apex of the cone ( The shape is cut with a flat or curved surface), so that when the fixed disk (the brake disk 4 in the case of the electromagnetic brake X described above) starts to be inserted into the hub 3, the fixed to the hub 3 The correction of the disc misalignment can be started, and the operation of assembling the hub 3 and the fixed discs by spline connection can be performed more smoothly and appropriately. Further, since the effect of correcting misalignment by the insertion guide portion having such a sharp tip portion is high, the insertion guide portion 3b of the hub 3 is extended to the vicinity of the insertion end 3b or the vicinity of the insertion end 3b, and the insertion guide portion having a sharp tip is circumferentially disposed. In addition, for example, even if only a few (three in the illustrated example are separated by 120 degrees in the circumferential direction) hub side spline teeth (spline tooth main body) are attached, a sufficient displacement correction effect can be obtained.

  As shown in FIGS. 4 and 5, if the insertion end 3b of the hub 3 is chamfered, the relative position of the fixed disk with respect to the hub is shifted in the radial direction when the fixed disk is inserted into the hub. The disk side spline teeth come into contact with the chamfered part before the disk side spline teeth come into contact with the guide insertion part, and continue to abut on the disk side spline tooth chamfered part during the insertion work. The positional deviation in the radial direction of the fixed disk can be corrected, and the centering adjustment between the hub and the fixed disk can be easily performed.

  Further, the spline tooth main body and the insertion guide portion may be formed integrally, or an existing hub side spline tooth is regarded as the spline tooth main body of the present invention, and this spline tooth main body is separated from the spline tooth main body. A hub-side spline tooth with an insertion guide function may be formed by providing the insertion guide portion at a position continuous with the spline tooth main body (attached later).

  In the above-described embodiment, an example in which the number of circumferentially inclined surfaces of the insertion guide portion in one hub side spline tooth is set to 2 (a pair of circumferentially inclined surfaces opposed to the circumferential direction) is illustrated. The number of circumferentially inclined surfaces of the insertion guide portion in the hub side spline teeth can be set to 1. As a specific example, among the pair of circumferentially opposed surfaces that define the tooth thickness that is the circumferential dimension of the spline tooth body, a circumferentially inclined surface is formed at a position that is continuous in the axial direction on one circumferentially opposed surface. An example in which the surface continuous in the axial direction with the other circumferential surface is a surface that is not inclined in the circumferential direction.

  As described above, the various configurations of the hub can be applied to the electromagnetic clutch. That is, as one of the pair of clutch plates arranged opposite to each other in the axial direction of the shaft, an annular plate shape is formed, and spline teeth that can be engaged with the hub side spline teeth are formed on the inner peripheral surface (inner peripheral edge). When this is applied, when the clutch plate (corresponding to the “fixed disk” of the present invention) is assembled to the hub by spline coupling, the hub-side spline teeth are appropriately set to the above-described various shapes, whereby the clutch plate And the hub can be assembled easily and smoothly. Then, such one clutch plate (fixed disc) is pressed against the other clutch plate or armature (corresponding to the “movable disc” of the present invention) directly by electromagnetic contact / separation means or via a friction material, thereby generating rotational torque. A configuration that can be switched between a state where transmission is possible and a state where rotational torque is not transmitted without being brought into contact with a clutch plate which is a fixed disk is a configuration according to a known electromagnetic clutch.

  Further, the urging member constituting the electromagnetic contact / separation means may urge the armature (movable disk) in the direction away from the electromagnet part by using the force of the permanent magnet provided in the electromagnet part. . In this case, in the non-excited state, the armature is urged away from the electromagnet portion by the force of the permanent magnet, while in the excited state, the coil magnetic flux may be configured to cancel the force of the permanent magnet.

  In addition, an excitation operation type configured to transmit torque from the rotating shaft (shaft) side on the input side to the output side or from the input unit side to the rotating shaft side on the output side by magnetic attraction force in the excited state. Even in an electromagnetic coupling device such as a clutch or an excitation actuated brake configured such that a braking force is applied to the rotational movement of the armature by a magnetic attraction force in an excited state, a hub adopting the structure and shape of the hub side spline teeth described above is used. Can be applied.

  In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

2. Movable disc (armature)
3 ... Hub 31 ... Hub side spline teeth 3b ... insertion end 4 ... fixed disc (brake disc)
41 ... Disc side spline teeth (disc side spline teeth)
8 ... Spline tooth main body 9 ... Insertion guide part 91 ... Radial direction inclined surface 92 ... Circumferential direction inclined surface 93 ... Tip part S ... Shaft (braking shaft)
X ... Electromagnetic coupling device (electromagnetic brake)

Claims (2)

A hub fixed to the shaft so as to be integrally rotatable; a fixed disk that is inserted in the axial direction of the shaft from the insertion end side of the hub and assembled by spline coupling; and is immovable in the axial direction of the shaft; and the shaft A movable disk capable of moving toward and away from the fixed disk along an axial direction of the movable disk, and electromagnetic contact and separation means for contacting and separating the fixed disk and the movable disk from each other. An electromagnetic coupling device that realizes torque transmission between the hub side fixed disk and the movable disk by pressing the fixed disk to the fixed disk,
A plurality of hub side spline teeth that can be splined with disk side spline teeth formed on the inner peripheral surface of the fixed disk are formed on the outer peripheral surface of the hub in the circumferential direction, and at least one or more hub side spline teeth are A spline tooth main body meshing with the disk side spline teeth adjacent in the circumferential direction in the assembled state, and an insertion guide portion provided at a position continuous with the spline tooth main body and closer to the insertion end than the spline tooth main body The insertion guide portion is configured to have a radially inclined surface inclined in the radial direction of the hub and a circumferentially inclined surface inclined in the circumferential direction of the hub. Electromagnetic coupling device. 2. The electromagnetic coupling device according to claim 1, wherein the insertion guide portion has a sharpened tip extending from the insertion end to the vicinity of the insertion end of the hub.

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