JP6478559B2 - Tensioner unit for auxiliary drive belt - Google Patents

Description

  The present invention relates to a tensioner unit used for adjusting the tension of a belt that drives an auxiliary machine such as an alternator and a water pump.

  In automotive engine accessory drive belt systems, the distance between the centers of the rotation shaft and crankshaft of an auxiliary machine such as an alternator or water pump changes due to the thermal expansion of the engine body during engine operation, and the change in the distance between the centers. Since the tension of the belt changes due to the torque fluctuation, the tensioner unit absorbs the belt tension change to keep the belt tension constant.

  Here, as a tensioner unit, what was described in the following patent document 1 is known conventionally. In this tensioner unit, a pulley arm having a boss portion serving as a swing center, a rotatable tension pulley supported at an eccentric position with respect to the swing center of the pulley arm, and a hydraulic auto that has one end connected to the pulley arm. The tensioner includes a boss portion of the pulley arm and the other end portion of the hydraulic auto tensioner to the engine block to be incorporated into the accessory drive belt transmission.

  By the way, in a conventionally known tensioner unit, as shown in FIG. 9I, a liner 82 for reducing sliding resistance is press-fitted into a boss portion 81 which is a swing center of a pulley arm 80, A sleeve 83 is provided on the inner side of the liner 82, a fixing bolt 84 is provided on the inner side of the sleeve 83, and a pair of washers 85 fitted to the bolt 84 and disposed at both ends of the sleeve 83.

  Here, the liner 82 is incorporated by press-fitting into the inner diameter surface of the boss portion 81, so that the liner 82 does not fall off, but the sleeve 83, the washer 85, and the fixing bolt 84 are simply inserted into the tensioner unit. There is a risk that these parts may fall off at the stage of transport / transport after assembly or assembly to the belt drive device for driving auxiliary equipment.

  In order to eliminate the inconvenience as described above, as shown in FIG. 9 (I), a tube having elasticity made of rubber at a distal end portion of the fixing bolt 84 that passes through the sleeve 83 and the washer 85 of the screw shaft 84a and faces the outside. It is generally performed to cover various parts such as a sleeve 83 that forms a swing center of the pulley arm 80 by covering the cover 86.

  In the hydraulic auto tensioner, a connecting piece for the pulley arm 80 is provided at one end, and a connecting piece for the engine block is provided at the other end, and a sleeve is inserted into a shaft insertion hole formed in each connecting piece. Insert the bolt into the sleeve, and attach the washer to the end facing the outside from the end of the sleeve. The sleeve, washer and bolt attached to the connecting piece to the engine block are simply inserted. However, since there is a risk of falling off, various parts are prevented from falling off by attaching a tube to the bolt.

JP 2005-180476 A

  By the way, as shown in FIG. 9 (I), in order to prevent the parts covering the ends of the screw shafts 84a of the fixing bolts 84 from falling off, the tubes 86 are mounted when the tensioner unit is attached to the engine block. It is necessary to remove, and the work becomes complicated. In addition, when removing the tube 86, various components such as the bolt 84, the washer 85, and the sleeve 83 may fall off, so care must be taken when removing the tube 86.

  Here, in the tensioner unit, as shown in FIG. 9 (I), a thrust washer 87 is incorporated between the opposing portions of the boss portion 81 and the washer 85 on both ends of the sleeve 83 so that the oscillation resistance of the pulley arm 80 is increased. There are also products designed to reduce this.

  In the tensioner unit as described above, when the tube 86 press-fitted into the screw shaft 84a of the fixing bolt 84 is removed, the thrust washer 87 moves in the axial direction of the screw shaft 84a as shown in FIG. The position is displaced in the direction, and the fixing bolt 84 may be tightened in the displaced state. In this case, the thrust washer 87 may be sandwiched between the sleeve 83 and the washer 85 or between the end face of the boss portion 81 and the washer 85 to be damaged.

  Further, there is a possibility that the swinging of the pulley arm 80 is hindered by the thrust washer 87 being sandwiched.

  An object of the present invention is to prevent various parts such as a sleeve, a washer and a bolt constituting a swing fulcrum portion of a pulley arm from falling off before the pulley arm is assembled, and to be attached to a tensioner mounting target in the state of preventing the falling off. It is to provide a tensioner unit that can be easily assembled.

  In order to solve the above-mentioned problems, in the first invention, a pulley arm having a cylindrical portion and supported to be swingable around the cylindrical portion, and supported at an eccentric position of the pulley arm with respect to the cylindrical portion. The belt-guided rotatable tension pulley for guiding the belt, the sleeve inserted into the tubular portion of the pulley arm, and the sleeve inserted by screwing the screw shaft portion provided in the tip portion into the tensioner mounting target. A tensioner unit for an accessory drive belt having a bolt for fixing the bolt and a washer fitted to the tip of the bolt, and a washer inner diameter surface on the back inner peripheral portion of the surface facing the cylindrical portion of the washer A caulking projection that protrudes from the inner diameter side of the screw shaft and faces the rear end portion of the bolt head side of the screw shaft portion in the axial direction, and is connected to the screw shaft portion of the caulking projection. That abutment by it had adopted a configuration in which tanning retaining washers.

  As in the first aspect of the invention, the washer is provided with a caulking protrusion that protrudes from the inner diameter surface to the inner diameter side so as to face the end of the screw shaft portion in the axial direction. The washer and bolt can be prevented from coming off by contact with the rear end, and the various parts constituting the swing fulcrum part of the pulley arm such as a sleeve inserted into the cylindrical part by the washer and the head of the bolt can be prevented. It can be.

  In addition, the tensioner unit can be attached by screwing a bolt into the tensioner attachment object in a state where various parts such as a sleeve constituting the swing fulcrum portion of the pulley arm are secured.

  Here, as a bolt, the bolt head side is a large-diameter shaft portion, and a screw having the same diameter as the large-diameter shaft portion is provided at the tip of a stepped straight shaft portion provided with a small-diameter shaft portion at the tip of the large-diameter shaft portion. What formed the axial part may be employ | adopted, and it may be made to oppose the crimping protrusion in the axial direction with a small axial gap at the end part of the straight axial part side of the screw shaft part.

  As described above, the caulking protrusion is opposed to the end portion of the screw shaft portion on the straight shaft portion side in the axial direction with a minute axial gap therebetween, so that the tube portion is interposed between the washer and the facing portion of the tube portion. When a thrust washer that reduces the rocking resistance is incorporated, it is possible to prevent the thrust washer from shifting in the radial direction.When the tensioner unit is assembled by tightening the bolt, the thrust washer is placed between the sleeve and the washer. It can prevent being pinched.

  In the use of the bolt as described above, the large-diameter shaft portion has an outer diameter that forms a minute radial clearance with respect to the inner diameter surface of the sleeve. There can be no support. As a result, the movement of the sleeve in the radial direction can be suppressed, and a stable attachment state to the sleeve can be obtained.

  The outer diameter of the small-diameter shaft portion is the same as the effective screw diameter of the screw shaft portion, and an incomplete screw portion is provided at the rear end of the screw shaft portion, and a caulking protrusion can be engaged with the incomplete screw portion. It is good.

  In the tensioner unit according to the first invention, a plurality of crimping protrusions are provided at intervals in the circumferential direction, so that the washer and the bolt can be reliably prevented from being detached.

  Here, a connecting piece provided at one end of the hydraulic auto tensioner is rotatably connected to the tensioner unit at an eccentric position with respect to the swing center of the pulley arm by tightening a bolt screwed into the pulley arm. There is a type in which a bolt to be screwed into a tensioner attachment target is penetrated and supported by a connecting piece provided at the other end of the tensioner, and a sleeve and a washer are attached to each of the bolts.

  In the second invention and the third invention, in the tensioner unit having the hydraulic auto tensioner as described above, various parts such as a sleeve, a washer, a bolt, and the like that constitute a pivotal connecting portion at both ends of the hydraulic auto tensioner are pulley arms. It is a technical problem to prevent the dropout before being assembled, and to allow the tensioner to be attached to the tensioner attachment target in a state where the dropout is prevented.

  In order to solve the above problems, in the second aspect of the invention, the connecting piece provided at one end of the hydraulic auto tensioner is rotated at an eccentric position with respect to the swing center of the pulley arm that is swingably supported by the tensioner mounting target. A connecting piece to be connected to the tensioner is provided at the other end of the hydraulic auto tensioner, and a sleeve is inserted into a connecting hole formed in the connecting piece at the other end. In the tensioner unit for an accessory drive belt, the washer is fitted to the tip of the bolt inserted into the bolt, and the sleeve is fixed by screwing the screw shaft portion provided at the tip of the bolt with respect to the tensioner attachment target. The inner surface of the back surface of the washer facing the sleeve projects from the inner surface of the washer to the inner diameter side and faces the rear end of the screw shaft in the axial direction. The fastening protrusions provided is of employing the configuration tanning retaining washer by the abutment against the threaded shaft portion of the caulking projection.

  In the second aspect of the invention, the washer and the bolt constituting the rotation connecting portion of the hydraulic auto tensioner can be prevented from being detached, and the bolt can be screwed into the tensioner mounting target in the secured state. .

  According to a third aspect of the present invention, there is provided a hydraulic auto tensioner in which a connecting piece that is rotatably connected to an eccentric position with respect to a swing center of a pulley arm that is swingably supported by a tensioner mounting target is provided at one end. A connecting piece that is rotatably connected to the tensioner attachment target is provided at the other end, a connecting hole is formed in the connecting piece provided at one end of the hydraulic auto tensioner, and a sleeve is inserted into the connecting hole. A tensioner for an auxiliary machine driving belt, in which a washer is fitted to a tip portion of a bolt inserted into the sleeve, and the sleeve is fixed by screwing the screw shaft portion provided at the tip portion of the bolt with respect to a tensioner attachment target. In the unit, the inner surface of the back surface of the washer facing the sleeve protrudes from the inner surface of the washer to the inner diameter side, and the rear end portion of the screw shaft portion extends in the axial direction. The crimping projections direction provided, it was adopted a structure in which tanning retaining washer by the abutment against the threaded shaft portion of the caulking projection.

  In the third aspect of the invention, even if the connection bolt to the pulley arm is loosened and the connection between the pulley arm and the hydraulic auto tensioner is released, the connection to the pulley arm provided at one end portion of the hydraulic auto tensioner is performed. The bolts and washers attached to the connecting pieces can be held in a retaining state to prevent falling off.

  In the first aspect of the invention, as described above, the rear end of the screw shaft portion provided at the tip end portion of the bolt that protrudes from the inner diameter surface of the washer to the inner diameter side on the back inner peripheral portion of the surface facing the cylindrical portion of the washer Swinging fulcrum of pulley arms such as washers, bolts and sleeves inserted into the cylinder by the contact of the crimping projection with the rear end of the screw shaft It is possible to prevent the parts from falling off without increasing the number of parts constituting the fulcrum.

  Further, in the state where various parts constituting the swing fulcrum portion of the pulley arm are secured, the tensioner unit can be easily assembled by attaching the bolt to the tensioner attachment target. .

  In the second invention, by providing a caulking projection on the inner peripheral portion of the back surface of the face facing the sleeve of the washer, it is possible to prevent the washer and the bolt constituting the pivotal connecting portion of the hydraulic auto tensioner from coming off. In this state, the bolt can be screwed into the tensioner mounting target.

  In the third aspect of the present invention, the caulking projection is provided on the inner peripheral portion of the back surface of the face facing the sleeve of the washer, so that the connection bolt to the pulley arm is loosened, and the connection between the pulley arm and the hydraulic auto tensioner is released. Even so, the bolts and washers attached to the connecting pieces for connecting to the pulley arm provided at one end of the hydraulic auto tensioner can be held in a retaining state to prevent falling off.

Front view showing a belt drive device for driving auxiliary equipment in which a tensioner unit according to the present invention is incorporated Sectional view along the line II-II in FIG. Sectional drawing of the state which expanded the washer incorporating part of FIG. Left side view of FIG. Front view showing another example of bolt Sectional view along line VI-VI in FIG. Sectional drawing which expands and shows the state before the connection piece provided in the one end part of the hydraulic auto tensioner is connected with a pulley arm Left side view of FIG. (I) is a cross-sectional view showing a conventional drop-off prevention structure, (II) is a cross-section showing a state in which a thrust washer is sandwiched between a sleeve and a washer by tightening a fixing bolt after the tube shown in (I) is removed. Figure

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a state in which the tension of the belt B is adjusted by assembling the tensioner unit U according to the present invention to a belt drive device for driving auxiliary equipment.

  The tensioner unit U has a pulley arm 10 that is swingably supported, a rotatable tension pulley 30 that is supported at an eccentric position with respect to the swing center of the pulley arm 10, and one end connected to the pulley arm 10. It consists of a hydraulic auto tensioner 40 that can swing around the part.

  As shown in FIGS. 1 and 2, the pulley arm 10 has a cylindrical portion 11 serving as a swing center at one end, and one end of the hydraulic auto tensioner 40 is connected between the cylindrical portion 11 and the tension pulley 30. Has been.

  The tensioner unit U is incorporated into the belt drive device for driving the auxiliary machine by attaching the other end of the cylinder portion 11 and the hydraulic auto tensioner 40 to the engine block A, and a load is applied from the hydraulic auto tensioner 40 to the pulley arm 10. The tension pulley 30 is pressed against the belt B by the adjusted force.

  As shown in FIGS. 2 and 3, a pair of liners 12 is press-fitted into a cylindrical portion 11 provided in the pulley arm 10, and a sleeve 13 is inserted inside the liner 12.

  The liner 12 reduces the rocking resistance of the pulley arm 10 and is preferably formed of a material having low frictional resistance. Examples of such a material include a material obtained by impregnating a sintered metal with a lubricating oil.

  Bolts 14 are inserted inside the sleeve 13. The bolt 14 has a configuration in which a head portion 16 is provided at one end portion of the straight shaft portion 15 and a screw shaft portion 17 is provided at the other end portion of the straight shaft portion 15.

  The straight shaft portion 15 is a stepped shaft having a large-diameter shaft portion 15a on the head 16 side and a small-diameter shaft portion 15b provided at the end of the large-diameter shaft portion 15a. The portion 15a has an outer diameter that can be inserted between the inner diameter surface of the sleeve 13 with a minute radial clearance.

  On the other hand, the screw shaft portion 17 has the same diameter as the large-diameter shaft portion 15a. Furthermore, the small diameter shaft portion 15b has the same diameter as the effective screw diameter of the screw shaft portion 17, and an incomplete thread portion 17a is provided at the end of the screw shaft portion 17 on the small diameter shaft portion 15b side.

  As shown in FIG. 5, the small-diameter shaft portion 15 b has the same diameter as the thread root diameter of the screw shaft portion 17, and the screw shaft portion 17 is formed with a complete thread portion over the entire length in the axial direction. Also good.

  A washer 18 is incorporated between the head 16 of the bolt 14 and the opposite end of the sleeve 13. Further, a washer 19 is fitted on the outer side of the incomplete threaded portion 17a of the screw shaft portion 17 of the bolt 14 and abutted against the end face of the sleeve 13. Between the facing portion of the washer 19 and the cylindrical portion 11 and the bolt head Thrust washers 20a and 20b are respectively incorporated between the 16 side washer 18 and the opposed portion of the cylindrical portion 11.

  As shown in FIGS. 3 and 4, the washer 19 fitted to the outside of the incomplete threaded portion 17 a of the screw shaft portion 17 has a washer 19 on the back inner peripheral portion of the opposite surface facing the tube portion 11. A plurality of caulking protrusions 21 projecting from the inner diameter surface to the inner diameter side are provided at equal intervals in the circumferential direction.

  The inscribed circle diameters of the plurality of caulking protrusions 21 are smaller than the outer diameter of the screw shaft portion 17 and larger than the effective screw diameter, so that the gap between the incomplete screw portion 17a of the screw shaft portion 17 and the minute gap is small. The washer 19 and the bolt 14 are prevented from coming off by contacting with the incomplete threaded portion 17a.

  In this way, the bolt 14 and the washer 19 are prevented from being removed by providing a plurality of caulking protrusions 21 that are axially opposed to the incomplete threaded portion 17a on the inner peripheral portion of the back surface of the washer 19 facing the cylindrical portion 11. The sleeve 13 and the washers 18 and 19 and the thrust washers 20a and 20b incorporated in the cylinder portion 11 by the retaining thereof are held in the assembled state, and the engine in which the tensioner unit U is the tensioner mounting target is retained. It is possible to prevent the various parts constituting the swinging center portion of the pulley arm 10 from falling off before being assembled to the block A.

  Here, when attaching the pulley arm 10, as shown in FIG. 2, a screw hole a is formed in the engine block A, and the screw shaft portion 17 of the bolt 14 is screwed into the screw hole a and tightened. The sleeve 13 is fixed by the tightening, and the pulley arm 10 is swingably supported around the sleeve 13.

  In this way, the tensioner unit U can be attached by screwing the bolt 14 into the engine block A as a tensioner attachment target in a state where various parts constituting the swing fulcrum portion of the pulley arm 10 are secured. The tensioner unit U can be easily assembled.

  Further, since the caulking protrusion 21 is opposed to the end portion of the screw shaft portion 17 on the small diameter shaft portion 15b side in the axial direction with a small axial gap, the thrust washers 20a and 20b are located on the end portion of the sleeve 13. Therefore, there is no inconvenience that the thrust washers 20a, 20b are sandwiched between the sleeve 13 and the washers 18, 19 when the tensioner unit U is assembled by tightening the bolt 14.

  FIG. 6 shows a hydraulic auto tensioner 40 that applies adjustment force to the pulley arm 10. The hydraulic auto tensioner 40 includes a cylinder 41 in which hydraulic oil is placed, an oil seal 42 that seals an upper opening of the cylinder 41 to form an air pocket on the hydraulic oil surface, and the oil seal 42. The rod 43 slidably penetrates, a return spring 44 that imparts outward protrusion to the rod 43, and a hydraulic damper 45 that cushions the pushing force applied to the rod 43.

  The return spring 44 is provided outside the cylinder 41 and is supported at one end by a spring seat 46 provided at the upper end of the rod 43 and at the other end by a flange 47 provided at the outer periphery of the lower end of the cylinder 41. Is given outward protrusion.

  The hydraulic damper 45 slidably incorporates a plunger 49 into a bottomed sleeve 48 incorporated in the cylinder 41 to partition the inside of the cylinder 41 into a pressure chamber 50 and a reservoir chamber 51, and the plunger 49 has a lower pressure. A passage 52 communicating with the chamber 50 and the upper reservoir chamber 51 is provided, and a check valve 53 is provided in the passage 52, and the plunger 49 is pressed against the lower end portion of the rod 43 by a plunger spring 54 incorporated in the pressure chamber 50. Yes.

  Here, the check valve 53 closes the passage 52 when the pressure in the pressure chamber 50 becomes higher than the pressure in the reservoir chamber 51.

  In the hydraulic auto tensioner 40 having the above-described configuration, the connecting piece 55 provided on the spring seat 46 is rotatably connected to the pulley arm 10, and the connecting piece 56 provided on the lower end of the cylinder 41 rotates to the engine block A. The pushing force applied to the rod 43 from the belt B through the tension pulley 30 and the pulley arm 10 is movably coupled to be buffered by the hydraulic damper 45, and the tension of the belt B is kept constant.

  When connecting the hydraulic auto tensioner 40 to the pulley arm 10, the connecting piece 55 provided in the spring seat 46 is provided with a connecting hole 57 penetrating both sides, and a cylindrical liner 58 is press-fitted into the inner diameter surface of the connecting hole 57, The sleeve 59 is inserted inside the liner 58, and the straight shaft portion 60a of the bolt 60 is inserted inside the sleeve 59, and the washer 61 is attached to the straight shaft portion 60a. The screw shaft portion 60b provided on the screw arm is screwed into the screw hole 62 formed in the pulley arm 10 and tightened.

  Here, as shown in FIGS. 7 and 8, the washer 61 protrudes from the inner surface of the washer to the inner diameter side from the inner surface of the back surface of the face facing the connecting piece 55, and has a small gap from the end of the screw shaft portion 60 b. A caulking protrusion 63 is provided which faces in the axial direction.

  By providing the caulking protrusion 63 on the washer 61 as described above, even if the bolt 60 is loosened before the tensioner unit is assembled and the connection of the connecting piece 55 to the pulley arm 10 is released, the bolt 60 and the washer 61 is prevented from being pulled out by the caulking projection 63, and various parts such as the bolt 60, the washer 61 and the sleeve 59 can be prevented from falling off from the connecting piece 55.

  Further, when connecting the connecting piece 56 below the cylinder 41 to the engine block A, as shown in FIG. 6, the connecting piece 56 is provided with connecting holes 64 penetrating both sides, and a cylindrical is formed on the inner diameter surface of the connecting hole 64. The sleeve 65 is inserted into the liner 65, the straight shaft portion 67a of the bolt 67 is inserted into the sleeve 66, and the washer 68 is attached to the straight shaft portion 67a. The screw shaft portion 67b provided at the tip of the straight shaft portion 67a is screwed into the screw hole 69 formed in the engine block A and tightened.

  7 and 8, the washer 68 protrudes from the inner surface of the washer to the inner diameter side on the back inner surface of the surface facing the connecting piece 56, and the end of the screw shaft portion 67 b. A caulking projection 70 is provided which is opposed in the axial direction with a minute gap.

  By providing the caulking projection 70 on the washer 68 as described above, the bolt 67 and the washer 68 can be prevented from being pulled out, and the bolt 67, the washer 68 and the sleeve 66 can be removed from the connecting piece 56 before the tensioner unit is assembled. Various parts can be prevented from falling off.

DESCRIPTION OF SYMBOLS 10 Pulley arm 11 Cylinder part 13 Sleeve 14 Bolt 15 Straight shaft part 15a Large diameter shaft part 15b Small diameter shaft part 16 Head part 17 Screw shaft part 19 Washer 21 Clamping protrusion 30 Tension pulley 40 Hydraulic auto tensioner 55 Connection piece 56 Connection piece 59 Sleeve 60 Bolt 61 Washer 63 Clamping projection 66 Sleeve 67 Bolt 68 Washer 70 Clamping projection

Claims (4)

A pulley arm (10) having a cylindrical portion (11) and supported so as to be swingable about the cylindrical portion (11), and supported at an eccentric position of the pulley arm (10) with respect to the cylindrical portion (11). A rotatable tension pulley (30) for guiding the belt, a sleeve (13) inserted into the cylindrical portion (11) of the pulley arm (10), and inserted into the sleeve (13), A bolt (14) for fixing the sleeve (13) by screwing the provided screw shaft portion (17) into a tensioner attachment target (A), and a washer (19) fitted to the tip of the bolt (14) In a tensioner unit for an auxiliary machine drive belt having
The bolt (14) includes a head (16), a straight shaft portion (15), and the screw shaft portion (17) provided at a tip of the straight shaft portion (15), and the straight A small-diameter shaft portion (15b) having a smaller diameter than the outer diameter of the screw shaft portion (17) is provided at an end of the shaft portion (15) on the screw shaft portion (17) side, and the washer (19) The screw shaft portion (17) and the small diameter shaft portion (15b) are fitted to the outside of the boundary portion,
A rear end portion of the screw shaft portion (17) on the bolt head side that projects from the inner diameter surface of the washer (19) to the inner diameter side of the back surface of the washer (19) facing the tube portion (11). A caulking protrusion (21) facing in the axial direction is provided,
A plurality of the caulking protrusions (21) are provided at intervals in the circumferential direction ,
The accessory drive belt characterized in that the washer (19) is secured by axial contact with the end portion of the screw shaft portion (17) on the small diameter shaft portion (15b) side of the caulking projection (21). Tensioner unit for The straight shaft portion of the bolt (14) (15), said head (16) side is a large diameter shaft portion (15a), the small diameter portion at the tip of the large diameter shaft portion (15a) (15b) Is provided with a step ,
2. The tensioner unit for an accessory drive belt according to claim 1 , wherein the large-diameter shaft portion (15 a) has an outer diameter that can be inserted with a small radial clearance on an inner diameter surface of the sleeve (13). A pulley arm (10) that is swingably supported by the tensioner attachment target (A), and a rotatable tension pulley (30) for guiding a belt supported at an eccentric position with respect to the swing center of the pulley arm (10); A connecting piece (55) provided at one end is pivotally connected to an eccentric position with respect to the swing center of the pulley arm (10), and a connecting piece (56) connected to the tensioner attachment target (A) is the other end. And a sleeve (66) inserted into a connecting hole (64) formed in a connecting piece (56) at the other end of the hydraulic auto tensioner (40). Then, the sleeve (66) is inserted into the sleeve (66), and the sleeve (66) is fixed by screwing the screw shaft portion (67b) provided at the tip portion into the tensioner attachment target (A). A bolt (67), the tensioner unit of the bolt (67) for accessory driving belt comprising a tip fitted with washers (68) of,
The bolt (67) has a head, a straight shaft portion (67a), and the screw shaft portion (67b) provided at the tip of the straight shaft portion (67a), and the straight shaft portion ( 67a) is provided with a small-diameter shaft portion having a smaller diameter than the outer diameter of the screw shaft portion (67b) at the end portion on the screw shaft portion (67b) side, and the washer (68) is formed by the screw shaft portion (67b). And the outside of the boundary portion between the small diameter shaft portion and
A rear end portion of the screw head portion (67b) and a rear end portion of the screw shaft portion (67b) projecting from the inner surface of the washer (68) to the inner surface of the back surface of the washer (68) facing the sleeve (66). A caulking protrusion (70) facing in the direction,
A plurality of the caulking protrusions (70) are provided at intervals in the circumferential direction,
A tensioner for an accessory drive belt, wherein the washer (68) is prevented from being removed by axial contact of the screw shaft portion (67b) of the caulking projection (70) with the end portion on the small diameter shaft portion side. unit. A pulley arm (10) that is swingably supported by the tensioner attachment target (A), and a rotatable tension pulley (30) for guiding a belt supported at an eccentric position with respect to the swing center of the pulley arm (10); A connecting piece (55) connected to an eccentric position with respect to the swing center of the pulley arm (10) is provided at one end, and a connecting piece (56) connected rotatably to the tensioner mounting target (A) is the other end. A hydraulic auto tensioner (40) provided in the section, and a sleeve (59) inserted into a coupling hole (57) formed in a coupling piece (55) at one end of the hydraulic auto tensioner (40). , volume that is inserted into the sleeve (59), fixed screw shaft portion provided at a front end portion of said sleeve (59) by screwing against the pulley arm (10) of (60b) And preparative (60), the tensioner unit for accessory driving belt comprising a washer (61) which is fitted to the distal end of the bolt (60),
The bolt (60) has a head, a straight shaft portion (60a), and the screw shaft portion (60b) provided at the tip of the straight shaft portion (60a), and the straight shaft portion ( The screw shaft portion (60b) side end portion of 60a) is provided with a small-diameter shaft portion having a smaller diameter than the outer diameter of the screw shaft portion (60b), and the washer (61) is connected to the screw shaft portion (60b). ) And the outside of the boundary portion between the small diameter shaft portion,
The rear end portion of the screw head portion (60b) and the rear end portion of the screw shaft portion (60b) project from the inner diameter surface of the washer (61) to the inner diameter side of the back surface of the washer (61) facing the sleeve (59). A caulking protrusion (63) facing in the direction,
A plurality of the caulking protrusions (63) are provided at intervals in the circumferential direction,
A tensioner for an accessory drive belt, wherein the washer (61) is secured by axial contact with the end of the screw shaft portion (60b) of the caulking projection (63) in the axial direction. unit.

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