JP6169450B2 - Torsional damper - Google Patents

Description

  The present invention relates to a torsional damper that is attached to a shaft end of a rotating shaft, such as a crankshaft of an internal combustion engine of an automobile, and mainly absorbs vibration in the torsional direction of the rotating shaft.

  The pulley attached to the end of the crankshaft of an internal combustion engine for automobiles has a torsional vibration reduction function for preventing the occurrence of problems due to the torsional vibration (vibration in the rotational direction) generated in the crankshaft as the internal combustion engine is driven. In other words, a torsional damper is provided. As shown in FIG. 10, this type of torsional damper basically includes a hub 101 fixed to the shaft end of the crankshaft, and an annular mass comprising a casting concentrically disposed on the outer peripheral side of the hub 101. A structure in which a body (pulley) 102 is elastically connected via an annular elastic body 103, and a resonance system composed of the annular mass body 102 and the elastic body 103 is input to the crankshaft via the hub 101. A dynamic vibration absorption effect is exhibited by resonating at a phase opposite to the phase of vibration displacement of the vibration.

  In this type of torsional damper, there is one that is reduced in weight by using a hub body 101a made of a metal plate press-molded product for the hub 101. In this case, since it is necessary to provide a sliding portion with an oil seal (not shown), the inner diameter flange portion of the hub main body 101a made of a press-formed product of a metal plate is coupled to the boss 101b made of a casting. Is one in which the inner diameter flange portion of the hub body 101a and the boss 101b are spot-welded WD at equal intervals in the circumferential direction, or are coupled by bolts arranged at equal intervals in the circumferential direction, or the following Patent Document 1 As described above, there are known ones in which the end portion of the boss 101b is crimped and those in which the inner diameter portion of the hub body 101a is crimped from both sides in the axial direction through the inner periphery of the boss 101b as in Patent Document 2.

JP2011-226645A Japanese Patent Laid-Open No. 04-231723

  However, in the case where the inner flange portion of the hub body 101a is bolted to the boss 101b at a plurality of locations in the circumferential direction, a plurality of bolts are required, so that not only the number of parts is increased but the number of bolts is tightened. However, there is a problem that the cost becomes high. In addition, in the case of spot welding, not only the cost is increased by the welding process, but also the dimensional accuracy is deteriorated by welding, so that there is a possibility that the deflection during rotation is increased.

  Further, in the configuration as in Patent Document 1, since the end portion of the boss 101b is caulked by plastic deformation, casting cannot be used as the material of the boss 101b. Since the inner periphery of 101b is covered with the cylinder part extended from the hub main body 101a, there exists a problem that a keyway cannot be formed in the inner peripheral surface of the boss | hub 101b.

  The present invention has been made in view of the above points, and its technical problem is to reduce the cost of a torsional damper having a hub formed by combining a hub body and a boss made of a press-molded product. And to improve quality.

  As a means for effectively solving the technical problem described above, a torsional damper according to the invention of claim 1 includes a hub having an inner diameter portion attached to the rotating shaft, and an annular mass concentrically disposed with the hub. A body, and an elastic body that elastically connects the hub and the mass body, the hub including a press-molded hub body and a cylindrical boss, and a caulking portion formed on an inner diameter portion of the hub body. The inward protruding edge formed on the inner peripheral surface of one end of the boss is caulked in a state where the inward protruding edge is gripped from the inner peripheral side and both axial sides.

  A torsional damper according to a second aspect of the present invention is the torsional damper according to the first aspect, wherein the inner diameter of the inward protruding edge of the boss is smaller than the inner peripheral surface of the cylindrical main body of the boss, And an annular recess between the cylindrical inner peripheral surface.

  A torsional damper according to a third aspect of the present invention is the torsional damper according to the first or second aspect, wherein the caulking portion of the hub body is in contact with the inner periphery of the inwardly protruding edge of the boss and the end portion is the inwardly protruding portion. It is pressed against the back side of the edge.

  A torsional damper according to a fourth aspect of the present invention is the tube according to any one of the first to third aspects, wherein the outer peripheral surface of the boss is formed on the hub body so as to be positioned on the outer peripheral side of the caulking portion. In contact with the inner peripheral surface of the shaped part in an inlay or an interference fit.

  A torsional damper according to a fifth aspect of the present invention is the torsional damper according to any one of the first to fourth aspects, wherein the inward protruding edge of the boss is divided in the circumferential direction.

  A torsional damper according to a sixth aspect of the present invention is the torsional damper according to the fifth aspect, wherein a key groove or a spline groove is formed on the inner peripheral surface of the boss through the split portion of the inwardly protruding edge of the boss. It is a thing.

  According to the torsional damper according to the invention of claim 1, since the hub body made of the press-molded body and the cylindrical boss are joined by caulking without using bolt fastening or welding, the number of parts and man-hours can be reduced. In addition, since the crimped portion formed on the inner diameter portion of the hub body is crimped, the boss can be made of a casting, and an inexpensive product can be provided.

  According to the torsional damper of the second aspect of the present invention, there is a structure in which the crimping portion formed on the inner diameter portion of the hub body is fitted to the inward protruding edge of the boss and plastically processed so as to open toward the annular recess. As a result, the hub body and the boss can be more firmly coupled.

  According to the torsional damper of the invention of claim 3, the caulking portion of the hub body is brought into contact with the inner periphery of the inward protruding edge of the boss by an inlay or an interference fit, and then the end portion of the inward protruding edge is The structure of claim 1 can be easily realized simply by plastic working so as to expand the diameter on the back side.

  According to the torsional damper according to the invention of claim 4, since the outer peripheral surface of the end portion of the boss is inlayed or tightly fitted to the inner peripheral surface of the cylindrical portion of the hub main body, the hub main body and the boss are in the radial direction. Positioning does not need to depend on the caulking portion of the hub body and the inward protruding edge of the boss, and therefore the concentricity of the hub body and the boss is not adversely affected by uneven thickness of the caulking portion, and the quality can be improved. .

  According to the torsional damper of the invention of claim 5 or claim 6, since the end of the caulking portion slightly bites into the portion where the inward protruding edge is divided in the circumferential direction in the caulking process, the hub The main body and the boss are prevented from rotating together and are more firmly connected.

It is sectional drawing which cuts and shows preferable 1st Embodiment of the torsional damper which concerns on this invention by the plane which passes along an axial center. It is explanatory drawing which shows the coupling | bonding process of a hub main body and a boss | hub in 1st embodiment of the torsional damper which concerns on this invention. It is sectional drawing which cut | disconnects and shows preferable 2nd Embodiment of the torsional damper which concerns on this invention by the plane which passes along an axial center. It is explanatory drawing which shows the coupling | bonding process of a hub main body and a boss | hub in 2nd embodiment of the torsional damper which concerns on this invention. It is explanatory drawing which shows the coupling | bonding process of a hub main body and a boss | hub in the example of a shape change of 2nd embodiment of the torsional damper which concerns on this invention. It is explanatory drawing which cut | disconnects and shows the boss | hub used in preferable 3rd embodiment of the torsional damper which concerns on this invention by the plane which passes along an axial center. It is explanatory drawing cut | disconnected and shown by the plane which passes along an axial center, and the example of a boss | hub shape change used in preferable 3rd embodiment of the torsional damper which concerns on this invention is shown. It is explanatory drawing which cuts and shows preferable 4th Embodiment of the torsional damper which concerns on this invention by the plane which passes along an axial center. FIG. 10 is an explanatory view showing a process of joining a hub body and a boss in a fourth preferred embodiment of a torsional damper according to the present invention. It is sectional drawing which cuts and shows an example of the torsional damper which concerns on a prior art by the plane which passes along an axial center.

  Hereinafter, preferred embodiments of a torsional damper according to the present invention will be described with reference to the drawings. In the following description, the “front side” means the left side in the figure and the front side of the vehicle, and the “back side” means the right side in the figure and the side where an internal combustion engine (not shown) exists. That is.

  First, FIG. 1 shows a first embodiment. This torsional damper includes a hub 1, an annular mass body 2 arranged concentrically on the outer periphery of the hub 1, a hub 1 and an annular mass body. And an annular elastic body 3 made of a rubber-like elastic material (rubber material or synthetic resin material having rubber-like elasticity) that elastically connects the two.

  The hub 1 includes a hub body 10 and a boss 20 concentrically coupled to the back surface of the inner diameter portion of the hub body 10. In detail, the hub body 10 is manufactured by press molding of a metal plate, and includes a caulking portion 11 having an inner diameter, a disk portion 12 developed from the caulking portion 11 to the outer diameter side, and an outer diameter end portion thereof. And a rim portion 13 extending to the front side.

  On the other hand, the boss 20 is made of a metal casting or the like. The boss 20 is externally inserted into an end portion of a crankshaft (not shown) of the internal combustion engine, and an inner peripheral surface from an end inner peripheral surface on the front side thereof. A projecting inward projecting edge 22 is provided, and an annular recess 23 is formed between the inner peripheral surface 21 a of the cylindrical body 21 and the inward projecting edge 22. Therefore, the inner diameter of the inward protruding edge 22 is appropriately smaller than the inner peripheral surface 21 a of the cylindrical main body 21. A key groove (not shown) extending in the axial direction is formed on the inner peripheral surface of the cylindrical main body 21 of the boss 20.

  The caulking portion 11 in the hub main body 10 is formed by folding the inner diameter portion of the disk portion 12 back to the rear side in a substantially J shape so as to grasp the inward protruding edge 22 of the boss 20 from both the inner peripheral side and the axial direction. The hub body 10 and the boss 20 are combined with each other to form the hub 1.

  The annular mass body 2 is made of a metal casting or the like, and is concentrically disposed on the outer peripheral side of the rim portion 13 in the hub body 10 of the hub 1. An endless belt (not shown) is provided on the outer peripheral surface. A poly V groove 2a is formed for winding and transmitting the rotational force to the auxiliary machine.

  The elastic body 3 is formed into a ring shape by a rubber-like elastic material (rubber material or a synthetic resin material having rubber-like elasticity) having excellent heat resistance, cold resistance and mechanical strength and having little internal heat generation. The hub body 10 is press-fitted between the outer peripheral surface of the rim portion 13 and the inner peripheral surface of the annular mass body 2 that faces the rim portion 13 in the radial direction. Then, the rim portion 13 of the hub body 10 and the inner peripheral surface of the annular mass body 2 facing each other gently undulate in the radial direction to prevent the elastic body 3 from falling off due to sliding in the axial direction. It has a shape. For this reason, the elastic body 3 is interposed between the rim portion 13 of the hub main body 10 and the annular mass body 2 in a state of undulating in the radial direction.

  The torsional direction (circumferential direction) resonance frequency of the resonance system constituted by the annular mass body 2 and the elastic body 3 is determined by the circumferential inertia mass of the annular mass body 2 and the circumferential shear spring constant of the elastic body 3. The frequency band is set such that the amplitude of the torsional vibration of the crankshaft is maximized.

  In the torsional damper of the first embodiment having the above-described configuration, the inner diameter portion of the disc portion 12 of the hub body 10 and the boss 20 in the hub 1 are extrapolated to one end of the crankshaft of the internal combustion engine, and the boss 20 The key groove (not shown) formed at one place on the inner peripheral surface of the inner circumferential surface of the inner peripheral surface is locked to the crankshaft through the key in the circumferential direction, and is fastened and fixed in the axial direction by a center bolt (not shown). Thus, when the internal combustion engine is driven, it is rotated together with the crankshaft. An endless belt is wound around the poly V groove 2a on the outer peripheral surface of the annular mass body 2 so as to transmit the rotational force of the crankshaft to the auxiliary machine.

  When the frequency of the torsional vibration input from the crankshaft through the hub 1 is in the vicinity of a band where the amplitude of the crankshaft becomes a maximum, the resonance system constituted by the annular mass body 2 and the elastic body 3 becomes the input vibration. Resonates with different phase angles, and exhibits a dynamic vibration absorption effect due to the torque generated by the vibration displacement in the opposite direction to the torque of the input vibration. For this reason, the peak of the torsional vibration of the crankshaft can be effectively reduced.

  According to the above-described configuration, the caulking portion 11 of the hub body 10 is caulked so as to go around the inner peripheral side of the inward projecting edge 22 of the boss 20. The contact area becomes large and can be firmly fixed to the crankshaft.

  Further, the caulking portion 11 of the hub main body 10 is caulked so as to cover only the inward protruding edge 22 of the boss 20, so that the rotation of the crankshaft with the crankshaft is prevented on the inner peripheral surface 21 a of the cylindrical main body 21 of the boss 20. Therefore, there is no inconvenience that a key groove cannot be formed.

  In the assembly of the torsional damper, in the operation of connecting the hub main body 10 and the boss 20, as shown in FIG. 2A, the caulking portion 11 of the hub main body 10 extends in a straight cylindrical shape toward the back side in advance. The outer diameter of the boss 20 is slightly smaller than the inner diameter of the inward protruding edge 22.

  Next, as shown in FIG. 2B, the cylindrical caulking portion 11 of the hub body 10 is brought into contact with the inner surface of the inward protruding edge 22 of the boss 20, and the disk portion 12 abuts against the end surface of the boss 20. Insert until The caulking portion 11 can be easily inserted because the outer diameter thereof is smaller than the inner diameter of the inward protruding edge 22 of the boss 20.

  As shown in FIG. 2C, the caulking portion 11 of the hub body 10 is expanded from the inner peripheral side and is brought into pressure contact with the inner peripheral surface of the inwardly protruding edge 22 of the boss 20. Is plastically processed so as to open into the annular recess 23 on the back side of the inward projecting edge 22 to form a substantially J-shaped cross section so that the inward projecting edge 22 is formed on the inner peripheral side and the shaft. Crimp so that it can be grabbed from both directions. As a result, the hub body 10 and the boss 20 are coupled to each other.

  Since the above assembling operation does not include a tightening process using a plurality of bolts, a welding process, and the like, the manufacturing cost can be reduced, and the hub body 10 and the boss 20 can be coupled with high precision concentricity. . Further, since the caulking portion 11 is formed on the hub body 10 side, the boss 20 does not need to be made of stainless steel and can be made of a casting, so that the cost can also be reduced in this respect.

  Moreover, since the inner diameter of the inward protruding edge 22 of the boss 20 is appropriately smaller than the inner peripheral surface 21a of the cylindrical main body 21, an annular recess 23 is formed on the back side of the inward protruding edge 22. The hub body 10 and the boss 20 can be firmly coupled by increasing the fitting area of the crimping portion 11 with respect to the inward protruding edge 22.

  Next, FIG. 3 shows a second embodiment of the torsional damper according to the present invention. In this embodiment, the difference from the first embodiment described above is the caulking portion of the hub body 10. 11 is in contact with the inner periphery of the inward protruding edge 22 of the boss 20 by an inlay or an interference fit, and the key groove 24 formed on the inner peripheral surface of the boss 20 is connected to the inward protruding edge 22. It exists in the point extended so that it may divide | segment at one place of the circumferential direction. Reference numeral 12a is a window portion that is opened at a predetermined interval in the circumferential direction in the disc portion 12 of the hub body 10 for weight reduction or the like.

  According to this configuration, like the first embodiment described above, the caulking portion 11 of the hub main body 10 holds the disc portion so that the inward protruding edge 22 of the boss 20 is grasped from the inner peripheral side and the axial direction both sides. Since the inner diameter portion of the boss 12 is folded back into a substantially J-shape toward the back surface and is plastic-worked (crimped) into a shape in pressure contact with the conical surface 22a on the back surface side of the inward protruding edge 22 of the boss 20, the hub 1 is connected to the crankshaft. The contact area with the center bolt to be fastened is increased and can be firmly fixed to the crankshaft. In addition, a part of the caulking portion 11 slightly bites into the portion 24a in which the key groove 24 extends so as to divide the inward protruding edge 22 at one circumferential direction in the caulking process. The bosses 20 are coupled to each other in a state where they are firmly prevented from rotating.

  In the assembly of the torsional damper, in the operation of joining the hub body 10 and the boss 20, first, as shown in FIG. 4A, the caulking portion 11 of the hub body 10 extends in a cylindrical shape straight to the back side. The outer diameter of the boss 20 is equal to or slightly larger than the inner diameter of the inward protruding edge 22 of the boss 20.

  Next, as shown in FIG. 4B, the cylindrical caulking portion 11 of the hub body 10 is brought into contact with the inner surface of the inward protruding edge 22 of the boss 20, and the disk portion 12 abuts against the end surface of the boss 20. Insert until Since the caulking portion 11 has an outer diameter that is equal to or slightly larger than the inner diameter of the inward protruding edge 22 of the boss 20, both are in an inlay state or an interference fit state.

  Next, as shown in FIG. 4C, the end portion of the crimping portion 11 is opened in a conical shape, and is plastically processed so as to be in pressure contact with the conical surface 22a on the back side of the inward protruding edge 22 of the boss 20. Then, the inward projecting edge 22 is crimped so as to be grasped from the inner peripheral side and both axial sides with a substantially J-shaped cross section. Further, in the process, a part of the caulking portion 11 slightly bites into a portion 24 a where the key groove 24 is extended so as to divide the inward protruding edge 22 in the circumferential direction. As a result, the hub body 10 and the boss 20 are coupled together while being prevented from rotating.

  According to the second embodiment, the caulking portion 11 is formed in advance so that its outer diameter is equal to or slightly larger than the inner diameter of the inward protruding edge 22 of the boss 20. As in the embodiment, in the process of caulking the caulking portion 11 of the hub main body 10, a process of increasing the diameter from the inner peripheral side and pressing the inner peripheral surface of the inward protruding edge 22 of the boss 20 is unnecessary. In addition, as shown in FIG. 5 to be described later, for example, the caulking portion of the caulking portion 11 is pressed by a rod-shaped caulking jig inserted from the back side into the inner periphery of the boss 20 while pressing the hub body 10 from the front side with a pressing jig. Simply pressing in the axial direction to open the tip can be done easily. Therefore, the manufacturing cost can be further reduced.

  Further, as described above, in the caulking, the step of expanding the caulking portion 11 of the hub main body 10 from the inner peripheral side and press-contacting the inner peripheral surface of the inward protruding edge 22 of the boss 20 is unnecessary. Even in the case of a casting or the like, it is possible to prevent the boss 20 from being cracked by the load in the diameter increasing direction from the crimping portion 11.

  Further, in this case, as shown in the example of the shape change of the second embodiment in FIG. 5, the caulking portion 11 of the hub main body 10 has an inner circumferential conical surface 11b whose inner circumferential surface becomes larger in diameter toward the tip side in advance. And a thin portion 11c at the tip thereof. In this case, when the caulking portion 11 is inserted into the inner periphery of the inward protruding edge 22 of the boss 20 as shown in FIG. 5B, the thin-walled portion 11c is a cone on the back side of the inward protruding edge 22. The dimension of each part of the crimping part 11 is set so that it may be located in the inner periphery of the surface 22a.

  If comprised in this way, in the operation | work which couple | bonds the hub main body 10 and the boss | hub 20, from the state shown to (A) of FIG. Insert into the inner periphery of the inward protruding edge 22 until the disk portion 12 of the hub body 10 contacts the end surface of the boss 20. Since the outer diameter of the caulking portion 11 is equal to or slightly larger than the inner diameter of the inwardly protruding edge 22 of the boss 20, both are brought into contact with each other by an inlay or an interference fit. The thin portion 11 c at the tip of the portion 11 is located on the inner periphery of the conical surface 22 a on the back side of the inward protruding edge 22.

  Next, as shown in FIG. 5C, the pressing jig 30 is brought into contact with the front side of the hub body 10, and the protrusion 31 protruding from the pressing jig 30 is connected to the inner peripheral hole of the caulking portion 11. The rod-shaped caulking jig 40 is inserted into the inner periphery of the boss 20 from the back side. An outer peripheral conical surface 41 having a small diameter toward the front end is formed on the outer peripheral surface of the end portion of the caulking jig 40, and the inclination angle thereof corresponds to the inner peripheral conical surface 11 b of the caulking portion 11 of the hub body 10. It has become.

  Then, as shown in FIG. 5D, the caulking jig 40 is inserted until the outer peripheral conical surface 41 at the tip of the caulking jig 40 comes into contact with the inner peripheral conical surface 11 b of the caulking portion 11 of the hub body 10. Then, in the process, the outer peripheral conical surface 41 interferes with the thin-walled portion 11c at the tip of the caulking portion 11 and is plastically deformed so as to open in a tapered shape. By crimping to the surface 22a, the inward projecting edge 22 is crimped so as to be grasped from the inner peripheral side and both axial sides with a substantially J-shaped cross section. Thus, as shown in FIG. 5E, the hub body 10 and the boss 20 can be coupled to each other.

  Also in this case, a part of the thin portion 11c of the caulking portion 11 slightly bites into the split portion 24a of the inwardly protruding edge 22 by the key groove 24 during the caulking process, so that the hub body 10 and the boss 20 rotate around each other. Can be joined in a stopped state.

  Next, FIG. 6 shows a third embodiment of the torsional damper according to the present invention. In this embodiment, the difference from the first or second embodiment described above is the inward projection. The edge 22 is divided at a plurality of locations in the circumferential direction.

  Also in this case, when the caulking portion of the hub main body is caulked to the boss 20 inward protruding edge 22, a part of the caulking portion slightly bites into the divided portion 22 b of the inward protruding edge 22. The bosses 20 can be coupled together while being prevented from rotating. Therefore, even if the boss 20 does not have the key groove 24 as in the second embodiment, the sliding torque between the hub body 10 and the boss 20 can be increased. For this reason, the concave shape and the number of the divided portions 22b are appropriately set in consideration of the necessary slip torque.

  Further, as shown in FIG. 7 showing an example of changing the shape of the boss in the third embodiment, spline grooves 25 are formed on the inner peripheral surface of the boss 20 with inward protruding edges 22 divided at a plurality of locations in the circumferential direction. In other words, the spline groove 25 can be formed so as to divide the inward protruding edge 22 in the circumferential direction. In this case, fretting of the boss 20 can be effectively prevented.

  Next, FIG. 8 shows a fourth embodiment of the torsional damper according to the present invention. In this embodiment, the difference from the first, second or third embodiment described above is as follows. In addition to the structure in which the crimped portion 11 of the hub main body 10 is crimped to the inward protruding edge 22 of the boss, the outer peripheral surface 26a of the flange portion 26 formed at the front end of the cylindrical main body 21 of the boss 20 10 is provided with a configuration in which the inner peripheral surface 14a of the cylindrical portion 14 which is located concentrically and located on the outer peripheral side of the crimping portion 11 is brought into contact with the inner peripheral surface 14a in an inlay or interference fit state.

  In the fourth embodiment, the key groove 24 is formed so as to divide the inward protruding edge 22 of the boss 20 at one place in the circumferential direction. However, FIG. 6 or FIG. 7, the inward protruding edge 22 of the boss 20 may be divided at a plurality of locations in the circumferential direction.

  In the torsional damper configured as described above, in the operation of joining the hub body 10 and the boss 20, first, in the state shown in FIG. 9A, the caulking portion 11 of the hub body 10 is straight in a cylindrical shape toward the back side. The outer diameter of the boss 20 is equal to or slightly smaller than the inner diameter of the inward protruding edge 22 of the boss 20. On the other hand, the inner peripheral surface 14 a of the cylindrical portion 14 of the hub body 10 is formed to have the same or slightly smaller diameter than the outer peripheral surface 26 a of the flange portion 26 of the boss 20.

  For this reason, from the state shown in FIG. 9A, as shown in FIG. 9B, the hub body 10 is inserted by inserting the flange portion 26 of the boss 20 into the inner periphery of the cylindrical portion 14 of the hub body 10. Is inserted into the inner periphery of the inwardly protruding edge 22 of the boss 20. At this time, since the inner peripheral surface 14a of the cylindrical portion 14 of the hub body 10 is equal to or slightly smaller than the outer diameter of the flange portion 26 of the boss 20, both are inlayed or in an interference fit state. Since the inner diameter of the cylindrical portion 14 of the main body 10 is equal to or slightly smaller than the outer diameter of the flange portion 26 of the boss 20, both are inlay or gap-fitted. Further, the flange portion 26 of the boss 20 is inserted into the inner periphery of the tubular portion 14 until the front end face 26b abuts against the wall surface 12b between the caulking portion 11 and the tubular portion 14 of the hub body 10. As a result, the tip end portion of the crimping portion 11 reaches the inner peripheral position on the back side of the inward protruding edge 22 of the boss 20.

  Next, as shown in FIG. 9B, the end portion of the crimping portion 11 is opened in a conical shape and is plastically processed so as to come into pressure contact with the conical surface 22a on the back side of the inwardly protruding edge 22 of the boss 20. Then, the inward projecting edge 22 is crimped so as to be grasped from the inner peripheral side and both axial sides with a substantially J-shaped cross section. As described above with reference to FIG. 5, this caulking process is also performed in the axial direction so as to open the front end of the caulking portion 11 with the rod-shaped caulking jig while pressing the wall surface 12 b of the hub body 10 from the front side with the pressing jig. It can be easily performed simply by pressing. As a result, the hub body 10 and the boss 20 are coupled to each other.

  According to the fourth embodiment, the outer peripheral surface 26a of the flange portion 26 of the boss 20 is inlayed or interference-fitted to the inner peripheral surface 14a of the tubular portion 14 of the hub main body 10, so that the hub main body 10 and the boss The radial positioning of 20 does not need to depend on the inlay or interference fit of the caulking portion 11 of the hub body 10 and the inward protruding edge 22 of the boss 20, that is, the outer peripheral surface of the caulking portion 11 and the inward protruding edge 22. There may be a gap between the inner circumferential surface and the inner circumferential surface.

  When the hub body 10 is press-formed, the caulking portion 11 may be unevenly thickened. As described above, the positioning of the hub body 10 and the boss 20 in the radial direction is performed by the flange portion 26 of the boss 20. Since the outer peripheral surface 26a and the inner peripheral surface 14a of the cylindrical portion 14 of the hub main body 10 are made by an inlay or an interference fit, the concentricity of the hub main body 10 and the boss 20 is such that the caulking portion 11 is unevenly thickened. In addition, since the circumference of the fitting surface becomes longer than the case where the caulking portion 11 of the hub body 10 and the inward protruding edge 22 of the boss 20 are fitted with an inlay or an interference fit, the inlay or The accuracy of the interference fit is also improved. For this reason, it is possible to effectively prevent the torsional damper from swinging due to misalignment.

DESCRIPTION OF SYMBOLS 1 Hub 2 Annular mass 3 Elastic body 10 Hub main body 11 Caulking part 12 Disk part 13 Rim part 14 Cylindrical part 14a Inner peripheral surface 20 Boss 21 Cylindrical main body 21a Inner peripheral surface 22 Inward protruding edge 23 Annular recessed part 24 Key groove 25 Spline groove 26 flange 26a outer peripheral surface 30 holding jig 40 caulking jig

Claims (6)

  A hub having an inner diameter portion attached to the rotating shaft, an annular mass body arranged concentrically with the hub, and an elastic body elastically connecting the hub and the mass body, the hub being press-molded A hub body and a cylindrical boss, and a caulking portion formed on an inner diameter portion of the hub body has an inward protruding edge formed on an inner peripheral surface of one end of the boss. A torsional damper characterized by being crimped from both sides in the axial direction.   The inner diameter of the inward protruding edge of the boss is smaller than the inner peripheral surface of the cylindrical main body of the boss, and an annular recess is provided between the inward protruding edge and the cylindrical inner peripheral surface. The torsional damper described in 1.   The caulking portion of the hub main body is in contact with the inner periphery of the inward protruding edge of the boss, and the end portion is pressed against the back side of the inward protruding edge. Torsional damper.   The outer peripheral surface of the end portion of the boss is brought into contact with the inner peripheral surface of a cylindrical portion formed on the hub body on the outer peripheral side of the caulking portion in an inlay or interference fit state. A torsional damper according to any one of the above.   The torsional damper according to any one of claims 1 to 4, wherein an inward protruding edge of the boss is divided in a circumferential direction.   The torsional damper according to claim 5, wherein a key groove or a spline groove is formed on an inner peripheral surface of the boss through a division portion of the inwardly protruding edge of the boss.

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