JP4904781B2 - Pulley with damper and manufacturing method thereof - Google Patents

Description

  The present invention relates to a technique of a pulley with a damper that is mounted on a crankshaft of an engine and transmits torque of the crankshaft to various auxiliary machines via an endless belt.

The pulley for transmitting the crankshaft rotation of the engine to various auxiliary machines mainly cuts off the crankshaft speed fluctuation caused by engine torque fluctuation at low engine speed, such as idling rotation, There is a pulley with a damper having a function of reducing torsional vibration of a shaft. As described in Patent Document 1, the pulley with a damper includes a damper unit that is attached to the crankshaft and a pulley unit that is assembled to the damper unit and over which an endless belt is stretched.
International Publication No. 2005/005865 Pamphlet (Figure 1)

  The conventional damper unit has a hub mounted on the crankshaft and an annular mass body fixed to the outer periphery of the hub via a first elastic body, and has a function of reducing torsional vibration of the crankshaft. ing. On the other hand, the pulley unit includes a cover body having a cylindrical portion in which a pulley groove is formed in the outer peripheral portion and a cover portion extending in the center direction from one axial end portion of the cylindrical portion. One end of the elastic body is fixed, and an isolation ring is fixed to the other end of the elastic body. The isolation ring has a radial portion to which the other end of the second elastic body is fixed, and a fitting portion that fits into a cylindrical portion provided in the hub when the pulley unit is assembled to the damper unit. The second elastic body is fixed between the damper unit and the pulley unit via the isolation ring, and has a function of blocking the crankshaft speed fluctuation caused by the crankshaft torque fluctuation at the time of low engine speed. ing. Further, in order to apply an axial compressive force to the second elastic body, a pressure ring having a fitting portion that fits into the cylindrical portion of the hub and a pressing portion that presses against the outer surface of the cover portion via a thrust bearing. It is mounted on the hub and rotates integrally with the damper unit.

  As described above, the conventional pulley with a damper includes a pulley unit that includes a cover body and an isolation ring that is fixed to the cover body via a second elastic body. The pulley unit is attached to the damper unit that is attached to the hub. In order to apply a compressive force to the second elastic body, it is necessary to fit the pressure ring to the hub and press it from the outside of the cover body.

  For this reason, in a conventional pulley with a damper, a gap corresponding to the thickness dimension of the thrust bearing is formed between the peripheral end of the pressure ring pressing portion and the cover body, and foreign matters such as dust enter the gap. Then, the foreign matter may adhere to the thrust bearing and promote the wear of the thrust bearing, and the durability may be reduced.

  In order to prevent this, a method of closing a part of the cover part toward the pressing part of the pressure ring and closing the gap, or a method of closing the gap with a lip seal in the circumferential direction is employed.

  However, even if a method is used in which a part of the cover part is bulged toward the pressing part of the pressure ring to close the gap, it is difficult to completely close the gap. In the method of covering with the lip seal, a process for providing the lip seal is required and the cost is increased.

  As described above, to assemble a damper-equipped pulley formed by a damper unit fixed to the hub, a pulley unit assembled to the damper unit, and a pressure ring that applies a compressive force to the second elastic body, After the pressure ring is assembled to the pulley unit, the pressure ring is assembled to the damper unit. Therefore, an assembly process (press-in process) of two processes of a press-in process for assembling the pulley unit and the pressure ring and a press-in process for assembling the pressure ring with the pulley unit assembled into the damper unit is necessary.

  The object of the present invention is to prevent foreign matter such as dust from entering the pressing portion (contact portion) that applies a compressive force to the elastic body provided between the hub side and the pulley unit side. An object of the present invention is to provide a pulley with a damper that is disposed in the pressing portion (contact portion) and can prevent a decrease in durability of a thrust bearing.

  Another object of the present invention is to provide a pulley with a damper that can be manufactured with a small number of assembly steps.

  A pulley with a damper according to the present invention is a pulley with a damper that is attached to a crankshaft of an engine and has a pulley unit and a damper unit, the pulley unit being attached to the crankshaft and radially outward. A hub having a connecting portion provided to extend, an outer cylindrical portion having a pulley groove formed on the outer peripheral surface, an end wall portion extending radially inward from an end portion of the outer cylindrical portion, and the end wall portion A pulley main body having a connecting portion integrated with the elastic body and an elastic body provided between the connecting portion of the hub and the connecting portion of the pulley main body, the damper unit being integrated with the hub And rotating to reduce torsional vibration of the crankshaft, and having an abutting end that abuts against the inner surface of the end wall via a thrust bearing, the damper unit Wherein the press-fitting of the axial direction of the Riyunitto side is adjustable.

  In the pulley with a damper of the present invention, the pulley body includes an outer cylindrical portion having a pulley groove formed on an outer peripheral surface, an end wall portion extending radially inward from an end portion of the outer cylindrical portion, and the end wall portion. An inner cylindrical portion extending in parallel with the outer cylindrical portion from the inner end of the inner cylindrical portion, and a connecting portion extending radially inward from the end portion of the inner cylindrical portion.

  In the pulley with a damper according to the present invention, the hub has a first fitting portion that extends in an axial direction, and the damper unit has a second fitting portion that fits into the first fitting portion. It is characterized by having.

  In the pulley with a damper according to the present invention, the damper unit includes an annular elastic body and an annular mass body provided on an outer periphery of the annular elastic body.

  In the pulley with a damper according to the present invention, the damper unit has an annular casing, an annular mass body accommodated in the annular casing, and a viscous fluid enclosed between the annular casing and the annular mass body. It is characterized by.

  In the pulley with a damper according to the present invention, the thrust bearing has a friction reducing function.

  In the pulley with a damper of the present invention, a journal bearing is provided between the outer peripheral surface of the damper unit and the inner peripheral surface of the outer cylindrical portion of the pulley body.

  The pulley with a damper according to the present invention is characterized in that an annular gap for promoting heat dissipation of the elastic body is provided between the connecting portion of the hub and the end wall portion of the pulley body.

  A method for manufacturing a pulley with a damper according to the present invention is a method for manufacturing a pulley with a damper, which is mounted on a crankshaft of an engine and has a pulley unit and a damper unit, wherein the mounting portion on the crankshaft is radially outward. A hub having a connecting portion extending and a first fitting portion extending in the axial direction, an outer cylindrical portion having a pulley groove formed on the outer peripheral surface, and radially inward from an end of the outer cylindrical portion A pulley body having an end wall portion extending in the direction and a connecting portion integrated with the end wall portion, and an elastic body provided between the connecting portion of the hub and the connecting portion of the pulley body. A damper unit having a step of preparing a pulley unit, a second fitting part that fits into the first fitting part, and a contact end part that comes into contact with an inner surface of the end wall part through a thrust bearing Unit And a step of press-fitting the second fitting portion into the first fitting portion to impart axial pre-compression to the elastic body via the damper unit and the pulley body, and the hub And a step of fitting the second fitting portion to the first fitting portion at a position where the axial separation length between the end face of the pulley and the pulley groove becomes a predetermined value.

  According to the present invention, the contact end portion that applies a compressive force to the elastic body provided between the hub side and the pulley unit side is covered with at least the outer cylindrical surface and the end wall portion on the pulley unit side. It is possible to prevent foreign matters such as dust from entering the contact end portion, and thus it is possible to prevent a decrease in the durability of the thrust bearing disposed at the contact end portion. Further, it is more preferable that the contact end portion is covered with the outer cylindrical surface, the end wall portion, and the inner cylindrical portion on the pulley unit side in order to prevent foreign matters such as dust from entering.

  According to the present invention, the pulley unit having the pulley main body, the hub, and the elastic body attached between them, and the damper unit are integrated by press-fitting to form a pulley with a damper. By combining with the damper unit, the damper unit can be assembled while adjusting the axial press-fitting amount with respect to the pulley unit. In addition, the damper-equipped pulley can be assembled by a single press-fitting process in which the second fitting portion provided in the damper unit is fitted into the first fitting portion provided in the hub of the pulley unit.

  According to the present invention, since the annular gap for promoting the heat dissipation of the elastic body is provided between the connecting portion of the hub and the side wall portion of the pulley body, the heat dissipation of the elastic body can be enhanced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view showing a damper-equipped pulley according to an embodiment of the present invention, and FIG. 2 is a sectional view showing an assembly process of the damper-equipped pulley shown in FIG.

  A pulley 10 with a damper according to the present invention includes a pulley unit 11 attached to a crankshaft (not shown) and a damper unit 12 assembled to the pulley unit 11. The pulley unit 11 includes a hub 13 attached to the crankshaft and a pulley body 14 around which an endless belt for transmitting the torque of the crankshaft to the auxiliary machine is stretched. The hub 13 has a cylindrical boss portion 16 as a mounting portion in which a mounting hole 15 through which the crankshaft is formed is formed. The boss portion 16 is connected to the boss portion 16 by extending radially outward at the axial center portion thereof. A portion 17 is provided, and the left end portion, that is, the distal end side portion in FIG. 1 of the boss portion 16 constituting the hub 13 is a first fitting portion 18 having a larger diameter than the proximal end side portion. In the hub 13, a boss portion 16 and a connecting portion 17 are integrally formed of a metal material by casting, rolling of sheet metal, or the like.

  The pulley body 14 includes an outer cylindrical portion 22 having a plurality of pulley grooves 21 formed on the outer peripheral surface, and an end wall portion 23 extending radially inward from the end portion of the outer cylindrical portion 22. An inner cylindrical portion 24 extending in parallel to the outer cylindrical portion 22 is provided at the inner end of the wall portion 23, and the inner cylindrical portion extends radially inward from this end portion of the inner cylindrical portion. A connecting portion 25 is provided. The pulley main body 14 is integrally formed with an outer cylindrical portion 22, an end wall portion 23, an inner cylindrical portion 24 and a connecting portion 25 by pressing using a metal material and cutting the pulley groove 21.

  Between the connecting portion 17 of the hub 13 and the connecting portion 25 of the pulley body 14, an isolator rubber, that is, an annular elastic body 26 formed in an annular shape by an elastic material such as vulcanized rubber is provided. The end surface is fixed to the connecting portion 17 by vulcanization bonding or the like, and the other end surface is fixed to the connecting portion 25 by vulcanization bonding or the like.

  Thus, the pulley unit 11 formed by the hub 13, the pulley body 14 and the annular elastic body 26 is provided with the annular elastic body 26 between the hub 13 and the pulley body 14. The hub 13 and the pulley main body 14 are disposed in a mold for vulcanizing and molding the annular elastic body 26. The crankshaft speed fluctuation is mainly blocked from being transmitted to the auxiliary machine. And the annular elastic body 26 is manufactured by vulcanization molding.

  The opposing surfaces of the connecting portions 17 and 25 are inclined so as to spread outward in the radial direction as shown in the figure, and the annular elastic body 26 fixed in the connecting portions 17 and 25 is formed on the inner peripheral surface. The axial length is shorter than the axial length of the outer peripheral surface, and the cross section is tapered.

  As shown in FIG. 1, the pulley main body 14 is disposed outside the hub 13 by overlapping the connecting portion 17 of the hub 13 and the connecting portion 25 of the pulley main body in the axial direction. Since the annular gap 27 communicating with the outside is provided between the connecting portion 17 of the hub 13, the heat radiation from the annular elastic body 26 is promoted through the annular gap 27.

  On the other hand, the damper unit 12 has a fixing member 31. The fixing member 31 is fitted to the outer peripheral surface of the fitting portion 18 on the tip end side of the hub 13, and the axial direction of the fitting portion 32. A pressing wall portion 33 extending radially outward from the end portion, and a tubular portion 34 extending in the axial direction from the radially outer end of the pressing wall portion 33 toward the end wall portion 23. ing.

  When the fixing member 31 is press-fitted into the fitting portion 18 of the hub 13 to be fitted and fixed, the inner cylinder of the pulley unit 11 is placed in a space 35 formed between the fitting portion 32 and the cylindrical portion 34 of the fixing member 31. The part 24, the connecting part 25, and the annular elastic body 26 are incorporated.

  A damper rubber, that is, an annular elastic body 36 formed in an annular shape by an elastic material such as vulcanized rubber is disposed outside the cylindrical portion 34 of the fixing member 31, and cast iron, cast steel or the like is disposed outside the annular elastic body 36. A metal inertia ring, that is, an annular mass body 37 is arranged.

  The annular elastic body 36 is press-fitted between the inner peripheral surface of the annular mass body 37 and the outer peripheral surface of the cylindrical portion 34, and the damper unit 12 has a rubber damper structure, which mainly has a function of reducing torsional vibration of the crankshaft. is doing.

  The damper unit 12 is assembled by being attached to the pulley unit 11 at the hub 13 portion by press-fitting the fitting portion 32 into the fitting portion 18 of the hub 13.

  The end of the annular mass body 37 on the end wall 23 side is a contact end 38 that contacts the inner surface of the end wall 23, and is between the contact end 38 and the inner surface of the end wall 23. Is made of a resin and is equipped with a thrust bearing 39 having a friction reducing function. Further, a journal bearing 40 made of resin and having a friction reducing function is mounted between the outer peripheral surface of the annular mass body 37 constituting the damper unit 12 and the inner peripheral surface of the outer cylindrical portion 22.

  As described above, by arranging the contact end portion 38 and the thrust bearing 39 in the closed space formed by the pulley unit 11 and the damper unit 12, it is possible to prevent foreign matters such as dust from adhering to the thrust bearing 39. The durability of the thrust bearing 39 can be prevented.

  Further, the end portion of the annular mass body 37 on the end wall portion 23 side is in contact with the inner surface of the end wall portion 23 of the pulley body 14 via the thrust bearing 39, so that the axial press-fitting amount of the fixing member 31 is adjusted. As a result, axial pre-compression is applied to the annular elastic body 26 via the damper unit 12 and the pulley body 14, and the axial positions of the pulley unit 11 and the damper unit 12 are adjusted. The distance L in the axial direction between the mounting portion end surface 16a and the reference position of the pulley groove 21 is adjusted. Therefore, it is possible to keep the separation length L of the pulley within a predetermined tolerance range while maintaining the precompression applied to the annular elastic body 26 within the allowable range.

  Next, a method for manufacturing the damper-equipped pulley 10 shown in FIG. 1 will be described with reference to FIG. The pulley unit 11 is made by injecting a fluid rubber material into a mold while the hub 13 and the pulley body 14 each made of a metal material are arranged in a mold for vulcanization molding. As shown in FIG. 2, the annular elastic body 26 is preliminarily manufactured in the preparation step by vulcanization molding. On the other hand, the damper unit 12 is manufactured in advance in a preparation step as shown in FIG. 2 by assembling an annular mass body 37 via an annular elastic body 36 on the outside of the cylindrical portion 34 of the fixed member 31 that has been pressed. The

  The thrust bearing 39 is mounted on a step formed on the end surface of the abutting end 38 of the annular mass body 37, and the journal bearing 40 is mounted on the inner peripheral surface of the outer cylindrical portion 22 of the pulley body 14. Keep it.

  In order to assemble the damper unit 12 to the pulley unit 11, one of the pulley unit 11 and the damper unit 12, for example, the pulley unit 11 is set on a holding member such as a mold (not shown), and the other damper unit 12 is mounted. Arranged on the pulley unit 11. Under this state, a hydraulic actuator (not shown) is pressed against the pressing wall portion 33 and operated, so that the axial separation length L between the end surface 16a of the hub 13 and the reference position of the pulley groove 21 becomes a predetermined value. The fitting portion 32 of the fixing member 31 is press-fitted into the fitting portion 18 of the hub 13 so that the fitting portion 32 is fitted to the outside of the fitting portion 18.

  As a result, the annular elastic body 26 is pre-compressed in the axial direction via the damper unit 12 and the pulley body 14. In this way, the pulley unit 11 and the damper unit 12 prepared in advance in the manufacturing process can be assembled with a damper by a single press-fitting process using a hydraulic actuator. Can be manufactured. The damper unit 12 may be set on the pulley unit 11 and the pulley unit 11 may be press-fitted by a hydraulic actuator.

  FIG. 3 is a sectional view showing a damper-equipped pulley according to another embodiment of the present invention, and FIG. 4 is a sectional view showing an assembly process of the damper-equipped pulley shown in FIG.

  3 and 4, members that are the same as the members constituting the damper-equipped pulley 10 illustrated in FIGS. 1 and 2 are denoted by the same reference numerals. The pulley unit 11a of the pulley with a damper 10a shown in FIG. 3 has the same structure as the pulley unit 11 shown in FIGS. 1 and 2, and includes a hub 13, a pulley body 14, and respective connecting portions 17, 25. And an annular elastic body 26 fixed between the two.

  On the other hand, the fixing member 41 of the damper unit 12a includes a fitting portion 32 that is fitted to the fitting portion 18 of the hub 13 and a pressing wall portion 33 that is integrated with the end portion and extends radially outward. A casing constituent member 42 is attached to the fixing member 41.

  The casing constituent member 42 forms an annular casing, which will be described later, together with the pressing wall portion 33 of the fixing member 41, and has an outer cylindrical portion 43, a contact end wall portion 44, a bent wall portion 45 and an inner cylindrical portion 46. Configured.

  The outer cylindrical portion 43 is fitted between the inner peripheral surface of the outer cylindrical portion 22 of the pulley body 14 via a journal bearing 40, and the contact end wall portion 44 is an end of the outer cylindrical portion 43. It extends radially inward from the part.

  The bent wall portion 45 faces the inner cylindrical portion 24 and the connecting portion 25 of the pulley body 14 via a gap, and extends from the radially inner end of the contact end wall portion 44 toward the pressing wall portion 33. It is bent in the inner diameter direction. Further, the inner cylindrical portion 46 extends in the axial direction from the radially inner end of the bent wall portion 45 and faces the fitting portion 32.

  Such a casing component 42 has an irregular cross-sectional shape in which the width dimension on the proximal end side is larger than the radial width dimension of the distal end portion on the end wall 23 side of the pulley body 14. The casing member 42 is fixed to the pressing wall 33 of the fixing member 41 so as to close the opening.

  The fixing member 41 and the casing component member 42 are formed by sheet metal rolling or pressing, but may be formed by casting.

  An annular casing 48 having an accommodation space 47 is formed by the pressing wall portion 33 of the fixing member 41 and the casing constituent member 42 attached to the pressing wall portion 33, and an annular mass body 37 a is formed in the accommodation space 47. A viscous fluid 49 is enclosed between the annular mass body 37a and the annular casing 48. Accordingly, the damper unit 12a shown in FIG. 3 has a viscous damper structure, and when a relative rotation occurs between the annular casing 48 and the annular mass body 37a, a shearing force acts on the viscous fluid 49, mainly. It has a function of reducing torsional vibration of the crankshaft.

  In order to form a gap between the outer surface of the annular mass 37a and the inner surface of the annular casing 48 and prevent the annular mass 37a from coming into direct contact with the inner surface of the annular casing 48, the axial mass of the annular mass 37a Bearings 51 and 52 are incorporated between the inner sides of both ends and the annular casing 48. In addition, an injection hole (not shown) for filling the accommodating space 47 with the viscous fluid 49 is formed in the pressing wall 33, and a plug (not shown) is attached to the pressing wall 33 to close the injection hole. It has become.

  A resin-made thrust bearing 39 is mounted as a friction reducing member between the abutting end wall 44 of the annular casing 48 (casing constituent member 42) and the inner surface of the end wall 23. A resin-made journal bearing 40 is mounted between the outer peripheral surface of the annular casing 48 (casing constituent member 42) and the inner peripheral surface of the outer cylindrical portion 22.

  As described above, by arranging the contact end wall portion 44 and the thrust bearing 39 in the closed space formed by the pulley unit 11a and the damper unit 12a, it is possible to prevent foreign matters such as dust from adhering to the thrust bearing 39. It is possible to prevent the durability of the thrust bearing 39 from being lowered.

  Further, the abutting end wall portion 44 of the annular casing 48 (casing constituent member 42) abuts against the inner surface of the end wall portion 23 of the pulley body 14 via the thrust bearing 39, so that the axial press-fitting amount of the fixing member 41. As a result, the axial elastic compression is applied to the annular elastic body 26 via the damper unit 12a and the pulley body 14, and the axial positions of the pulley unit 11a and the damper unit 12a are adjusted. The axial separation length L between the attachment portion end surface 16a of the pulley unit 11a and the reference position of the pulley groove 21 is adjusted. Therefore, it is possible to keep the separation length L of the pulley within a predetermined tolerance range while maintaining the precompression applied to the annular elastic body 26 within the allowable range.

  Further, as shown in FIG. 3, the pulley main body 14 is arranged outside the hub 13 by overlapping the connecting portion 17 of the hub 13 and the connecting portion 25 of the pulley main body 14 in the axial direction. Since an annular gap 27 communicating with the outside is provided between the portion 23 and the connecting portion 17 of the hub 13, heat radiation from the annular elastic body 26 is promoted through the annular gap 27.

  A pulley 10a with a damper shown in FIG. 3 is manufactured by assembling a pulley unit 11a and a damper unit 12a, which are manufactured in advance as shown in FIG. 4, similarly to the case shown in FIG.

  In this embodiment, the thrust bearing 39 is mounted on a step formed on the end surface of the abutting end wall 44 of the casing component member 42, and the journal bearing 40 is mounted on the pulley body 14. It is mounted on the inner peripheral surface of the outer cylindrical portion 22.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, a contact end 38 is formed on the annular mass body 37 of the damper unit 12, and a thrust bearing 39 is disposed between the contact end 38 and the end wall 23 of the pulley body 14. The thrust bearing 39 is not disposed between the contact end portion 38 and the end wall portion 23 of the annular mass body 37 so that they are not in contact with each other, and the end portion 23 side of the cylindrical portion 34 of the fixing member 31 is disposed. An abutting end portion may be formed on the shaft, and a thrust bearing 39 may be disposed between the abutting end portion and the end wall portion 23.

  Moreover, although the connection part 17 is integrally provided in the hub 13, the hub 13 and the connection part 17 may be formed separately and integrated after assembling. Further, although the hub 13 is integrally provided with the fitting portion 18, the hub 13 and the fitting portion 18 may be formed separately and integrated after assembling.

  Further, although the connecting portion 17 is integrally provided on the hub 13, a support member in which the fitting portion 18 and the connecting portion 17 that are fitted to the distal end portion side of the hub 13 are integrated is connected to the connecting portion 17. Thus, the pulley units 11 and 11a may be formed by attaching the support member to the hub 13 by press fitting to the connecting portion 25 of the pulley body 14 via the annular elastic body 26 in advance. Further, in the case shown in FIG. 3, the annular casing 48 is formed by a fixing member 41 having a fitting portion 32 and a pressing wall portion 33, and a casing constituent member 42 fixed to the pressing wall portion 33. However, an annular casing 48 is formed by the pressing wall portion 33 and the casing constituent member 42 attached to the pressing wall portion 33, and the inner cylindrical portion 46 of the annular casing 48 is fitted to the fixing member 41 including only the fitting portion 32. May be. Alternatively, the fitting portion 32 and the casing constituent member 42 may be integrally formed, and an annular plate member constituting the pressing wall portion may be attached to the opening of the casing constituent member 42.

  Further, in the above-described two embodiments, the thrust bearing 39 and the journal bearing 40 having the friction reducing function are used, but either one or both of the thrust bearing 39 and the journal bearing 40 are used. If a member that easily generates friction is used, the frictional resistance restricts the relative rotational displacement of the pulley unit relative to the damper unit. Therefore, the resonance point peak (resonance) that exists between the start of the engine and the idle speed is determined. Can be reduced).

It is sectional drawing which shows the pulley with a damper which is one embodiment of this invention. It is sectional drawing which shows the assembly process of the pulley with a damper shown in FIG. It is sectional drawing which shows the pulley with a damper which is other embodiment of this invention. It is sectional drawing which shows the assembly process of the pulley with a damper shown in FIG.

Explanation of symbols

10, 10a Pulley 11 with damper, 11a Pulley unit 12, 12a Damper unit 13 Hub 14 Pulley body 15 Mounting hole 16 Boss part (mounting part)
17 connecting portion 18 fitting portion (first fitting portion)
21 pulley groove 22 outer cylindrical portion 23 end wall portion 24 inner cylindrical portion 25 connecting portion 26 annular elastic body 31 fixing member 32 fitting portion (second fitting portion)
33 pressing wall 36 annular elastic body 37, 37a annular mass 39 thrust bearing 40 journal bearing 48 annular casing 49 viscous fluid

Claims (9)

A pulley with a damper mounted on a crankshaft of an engine and having a pulley unit and a damper unit,
The pulley unit is
A hub having a mounting portion to the crankshaft, and a connecting portion provided to extend radially outward;
An outer cylindrical portion having a pulley groove formed on the outer peripheral surface, an end wall portion extending radially inward from an end portion of the outer cylindrical portion, and a pulley body having a connecting portion integrated with the end wall portion; ,
An elastic body provided between the connecting portion of the hub and the connecting portion of the pulley body;
The damper unit is
The abutting end portion that rotates integrally with the hub to reduce torsional vibration of the crankshaft and abuts against the inner surface of the end wall portion via a thrust bearing,
A damper pulley, wherein the axial pressure Iriryou to the pulley unit side of the damper unit is adjustable. The pulley with a damper according to claim 1,
The pulley body includes an outer cylindrical portion having a pulley groove formed on an outer peripheral surface, an end wall portion extending radially inward from an end portion of the outer cylindrical portion, and an outer cylindrical portion extending from an inner end of the end wall portion. A pulley with a damper, comprising: an inner cylindrical portion extending in parallel with the portion; and a connecting portion extending radially inward from an end portion of the inner cylindrical portion. The pulley with a damper according to claim 1 or 2,
The hub has a first fitting portion extending in the axial direction,
The damper unit is a pulley with a damper, characterized in that the damper unit has a second fitting portion that fits into the first fitting portion.   The pulley with a damper according to any one of claims 1 to 3, wherein the damper unit includes an annular elastic body and an annular mass body provided on an outer periphery of the annular elastic body. Pulley.   The pulley with a damper according to any one of claims 1 to 3, wherein the damper unit includes an annular casing, an annular mass housed in the annular casing, and between the annular casing and the annular mass body. A pulley with a damper, comprising: a viscous fluid enclosed in   The pulley with a damper according to any one of claims 1 to 5, wherein the thrust bearing has a friction reducing function.   The pulley with a damper according to any one of claims 1 to 6, further comprising a journal bearing between an outer peripheral surface of the damper unit and an inner peripheral surface of the outer cylindrical portion of the pulley body. Pulley with damper.   The pulley with a damper according to any one of claims 1 to 7, wherein an annular gap is provided between the connecting portion of the hub and the end wall portion of the pulley body to promote heat dissipation of the elastic body. A pulley with a damper. A method of manufacturing a damper-equipped pulley having a pulley unit and a damper unit, which is attached to an engine crankshaft,
A hub having a mounting portion to the crankshaft, a connecting portion extending radially outward, a first fitting portion extending in the axial direction, and an outer cylinder having a pulley groove formed on the outer peripheral surface A pulley main body having a connecting portion integrated with the end wall portion, an end wall portion extending radially inward from an end portion of the outer cylindrical portion, and the connecting portion and the pulley main body of the hub Preparing a pulley unit having an elastic body provided between the connecting portion and
Preparing a damper unit having a second fitting portion that fits into the first fitting portion, and a contact end portion that comes into contact with the inner surface of the end wall portion via a thrust bearing;
The second fitting portion is press-fitted into the first fitting portion to apply axial pre-compression to the elastic body via the damper unit and the pulley body, and the end face of the hub and the pulley And a step of fitting the second fitting portion to the first fitting portion at a position where the axial distance from the groove becomes a predetermined value. .

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