JP2006336775A - Pulley device with built-in one-way clutch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pulley device with a built-in one-way clutch capable of extending the durability of grease and improving the durability life of the clutch by enlarging a clutch space to be filled with the grease and increasing the filling amount. <P>SOLUTION: The pulley device 10 with the built-in one-way clutch comprises a sleeve 11, a pulley 12 arranged around the sleeve 11 concentrically with the sleeve 11, and the one-way clutch 13 and a supporting bearing 14 arranged between the sleeve 11 and the pulley 12. The one-way clutch 13 has, at least, a roller and a clutch inner ring having a clutch inner ring raceway surface with which the roller has rolling contact and formed integrally with or separately from the sleeve 11. At least one of the sleeve 11 and the clutch inner ring 21 has a diameter constriction portion 26 between the roller 22 in the axial direction and a ball 17 of the supporting bearing 14, whose diameter is smaller than that of a portion overlapped with the clutch inner ring raceway surface in the axial direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pulley apparatus with a built-in one-way clutch, and in particular, as an auxiliary machine for an automobile, such as a starter, an alternator, a crank pulley, a compressor, an auxiliary machine driven by a motor at the time of engine idle stop, or an engine start. The present invention relates to a pulley device with a built-in one-way clutch to be used.

  For example, in the recent alternators, high performance and high output have been advanced, and high rotation, high load, high temperature, vibration, etc. have become severe, and various types of belts have been produced with high engine output. The conditions are even more severe. In addition, minute angular velocity fluctuations of the engine or the like cause belt flapping and belt squeal. For this reason, the current situation is that demand for pulley devices with a built-in one-way clutch that solves the problem of improving belt life and noise is increasing in the market (see, for example, Patent Document 1).

  As shown in FIG. 9, for example, a pulley device 100 with a built-in one-way clutch incorporated in an alternator described in Patent Document 1 includes a driven pulley 101 on which a drive belt from a drive pulley fixed to a crankshaft of an engine is stretched. And a sleeve 102 fixed to the rotating shaft of the alternator, and a one-way clutch 103 and a pair of support bearings 104 are disposed between the driven pulley 101 and the sleeve 102.

  The one-way clutch 103 is fitted on a clutch outer ring 105 fitted on the inner circumferential surface of the intermediate intermediate portion of the driven pulley 101 and an outer circumferential surface of the intermediate middle portion of the sleeve 102, and a cam surface (see FIG. And a plurality of rollers 107 rotatably disposed in a wedge space between the inner peripheral surface of the clutch outer ring 105 and the cam surface of the clutch inner ring 106. The one-way clutch 103 includes a clutch holder 108 having a plurality of pockets for individually accommodating the rollers 107, and a spring that is supported by the clutch holder 108 and elastically presses the rollers 107 in the locking direction (see FIG. Not shown).

  When the rotational angular speed of the driven pulley 101 is higher than the rotational angular speed of the rotating shaft of the alternator, the driven pulley 101 and the sleeve 102 become relatively unrotatable (locked) by the wedge action of the roller 107 of the one-way clutch 103. Thus, the rotational force of the engine is transmitted to the rotating shaft of the alternator. On the other hand, when the rotational angular speed of the driven pulley 101 is slower than the rotational angular speed of the rotating shaft of the alternator, such as a speed fluctuation or a minute angular speed fluctuation, the driven pulley 101 and the sleeve 102 can freely rotate (overrun state). Therefore, even when the rotational angular velocity of the crankshaft fluctuates, the one-way clutch 103 prevents the drive belt and the driven pulley 101 from rubbing, and the life of the drive belt is reduced due to the generation of abnormal noise called wear and wear. While preventing, it can prevent that the electric power generation efficiency of an alternator falls.

Further, grease lubrication is frequently used for lubrication of the one-way clutch 103, and the grease is filled in a space excluding the clutch cage 108, the spring, and the rollers 107.
JP 2001-32910 A

  By the way, in the one-way clutch using the above-described grease lubrication, when the grease deteriorates and the lubricity is deteriorated, wear of the clutch engagement surface rapidly proceeds, and the pulley device may reach the endurance life. For this reason, to improve the durability of the pulley device, it is effective to improve the grease life, and it is desirable to increase the amount of grease enclosed in the clutch space as much as possible in order to ensure the grease life. However, since the grease is filled in the space excluding the clutch cage, spring, and roller parts, the amount of grease that can be sealed is limited.

  The present invention has been made in view of the above-described circumstances, and its purpose is to expand the space in which grease can be enclosed, increase the amount of grease, thereby extending the grease life, and improving the durable life of the clutch. Another object is to provide a pulley device with a built-in one-way clutch.

The above object of the present invention can be achieved by the following constitution.
(1) Sleeve and
A pulley disposed around the sleeve and concentrically with the sleeve;
Rotation force is transmitted between the sleeve and the pulley only when the sleeve and the pulley are disposed between the sleeve and the pulley and one of the sleeve and the pulley tends to rotate relative to the other in a predetermined direction. A one-way clutch to
A support bearing that is disposed between the sleeve and the pulley and allows relative rotation between the sleeve and the pulley;
A one-way clutch built-in pulley device comprising:
The one-way clutch includes at least an engagement element, and a clutch inner ring having a clutch inner ring raceway surface to which the engagement element is capable of rolling, and formed integrally with the sleeve or separately from the sleeve.
At least one of the sleeve and the clutch inner ring has a reduced diameter portion having a smaller diameter than the portion overlapping the clutch inner ring raceway surface in the axial direction between the engagement element in the axial direction and the rolling element of the support bearing. One-way clutch built-in type pulley device.
In the case of a clutch inner ring, the portion overlapping the clutch inner ring raceway surface in the axial direction means a portion in the axial direction where the clutch inner ring raceway surface is formed, and the clutch inner ring and the sleeve may be integrally formed. Including.

  According to the present invention, at least one of the sleeve and the clutch inner ring has a reduced diameter portion having a smaller diameter than the portion overlapping the clutch inner ring raceway surface in the axial direction between the axial engagement element and the rolling element of the support bearing. Therefore, the space formed radially outward of the reduced diameter portion can be used as a lubricant reservoir, and the amount of lubricant that has been conventionally restricted by the size of the clutch can be increased. The service life of the one-way clutch can be improved. Further, since the lubricant reservoir is provided on the inner diameter side of the one-way clutch, the lubricant retained therein can easily ooze out into the clutch space due to the rotational centrifugal force during use, and good lubrication can be performed.

  Hereinafter, a pulley apparatus with a built-in one-way clutch according to each embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1A is a partial longitudinal sectional view for explaining the one-way clutch built-in pulley device for an alternator according to the first embodiment as the one-way clutch built-in pulley device of the present invention. These are the fragmentary sectional views along the II line of (a).

  As shown in FIG. 1, a pulley apparatus 10 with a built-in one-way clutch according to the first embodiment is for driving an auxiliary machine such as an alternator, and has a sleeve 11 in which a rotation shaft (not shown) is fitted. Around the sleeve 11, a pulley 12 having a belt groove 12 a formed on the outer peripheral surface is disposed concentrically with the sleeve 11. In addition, a one-way clutch 13 is disposed between the outer peripheral surface of the sleeve 11 and the inner peripheral surface of the pulley 12 in the intermediate portion in the axial direction of the annular space formed therebetween. For example, a pair of support bearings 14a and 14b such as deep groove ball bearings are disposed at both ends so as to sandwich the one-way clutch 13. In addition, the shape of the belt groove 12a can be designed in an arbitrary shape such as a V groove, a poly V groove, or a tooth groove. Further, the outer peripheral surface of the sleeve 11 is formed with a step, and the outer peripheral surface of the sleeve 11 has an axial middle portion as a large diameter portion 11a and both axial end portions as small diameter portions 11b.

  The one-way clutch 13 transmits the rotational force from the pulley 12 to the sleeve 11 only when the pulley 12 tends to rotate relative to the sleeve 11 in a predetermined direction. Further, the pair of support bearings 14 a and 14 b enables relative rotation between the sleeve 11 and the pulley 12 while supporting a radial load applied to the pulley 12.

  Each of the support bearings 14a and 14b includes an inner ring 15 that is externally fitted to the outer peripheral surface of the small diameter portion 11b of the sleeve 11, an outer ring 16 that is internally fitted to the inner peripheral surface of the pulley 12, and both raceway surfaces of the inner ring 15 and the outer ring 16. A plurality of balls 17 which are rolling elements arranged between them and a retainer 18 which holds the balls 17 so as to roll freely. Further, the support bearings 14a and 14b have seal members 19 that are arranged on both sides in the axial direction and prevent entry of foreign matter from the outside and leakage of lubricant such as grease from the inside.

  The one-way clutch 13 includes a clutch outer ring 20 that is press-fitted and fixed to the inner peripheral surface of the pulley 12, a clutch inner ring 21 that is press-fitted and fixed to the outer peripheral surface of the large-diameter portion of the sleeve 11, and the clutch outer ring 20 and the clutch inner ring 21. And a plurality of rollers 22 which are engaging members disposed between the rollers. The outer peripheral surface of the clutch inner ring 21 forms a cam surface that is a clutch inner ring raceway surface in which a plurality of ramp surfaces 21a are provided at predetermined intervals in the circumferential direction. The rollers 22 are rotatably held in a wedge space composed of each ramp surface 21 a and a cylindrical surface 20 a formed on the inner peripheral surface of the clutch outer ring 20.

  The one-way clutch 13 includes a clutch retainer 23 having a plurality of pockets for individually accommodating the rollers 22 and a spring 24 that elastically presses the rollers 22 in the locking direction (see FIG. 1B). And has.

  In the pulley apparatus 10 with a built-in one-way clutch configured as described above, when the rotational angular speed of the pulley 12 is faster than the rotational angular speed of the rotating shaft of the alternator, for example, the roller 22 of the one-way clutch 13 is engaged by the wedge action. Engaged between the ramp surface 21a of the inner ring 21 and the cylindrical surface 20a of the clutch outer ring 20, the pulley 12 and the sleeve 11 become non-rotatable (locked), and the engine torque is transmitted to the rotating shaft of the alternator. Is done. On the other hand, when the rotational angular velocity of the pulley 12 is slower than the rotational angular velocity of the alternator, the engagement of the rollers 22 is released, and the relative rotation between the pulley 12 and the sleeve 11 becomes free (overrun state).

  Here, in the present embodiment, the clutch inner ring 21 includes a plurality of holes penetrating in the radial direction at positions corresponding to the deepest portions of the ramp surfaces 21 a in the circumferential direction and substantially in the middle in the axial direction of the clutch inner ring 21. Through-holes 25 are formed.

  Further, the large-diameter portion 11a of the sleeve 11 is formed with a grease reservoir 26 that is a plurality of lubricant reservoirs communicating with the plurality of through holes 25, and a supply groove 27 that communicates the plurality of grease reservoirs 26 with each other. . Like the through hole 25, the grease reservoir 26 is disposed at a position corresponding to the deepest portion of each ramp surface 21, has a circumferential width larger than the circumferential dimension of the through hole 25 in the circumferential direction, and is large in the axial direction. It is designed to be smaller than the axial length of the diameter portion 11 a and larger than the axial length of the clutch inner ring 22. Thereby, the lubricant reservoir 26 formed in the sleeve 11 is a reduced diameter portion having a smaller diameter than the portion overlapping the cam surface 21a in the axial direction between the roller 22 in the axial direction and the ball 17 of the support bearings 14a and 14b. Configure.

  Further, the supply groove 27 has an axial width larger than the axial dimension of the through hole 25 and is positioned in the axial middle portion, and is formed in the circumferential direction at a predetermined depth shallower than the grease reservoir 26. Has been.

  In the one-way clutch 13 of this embodiment, in addition to the clutch space excluding the roller 22, the clutch retainer 23, and the spring 24, between the clutch outer ring 20 and the clutch outer ring 21 or the large diameter portion 11a of the sleeve 11, Since the grease reservoir 26 as the reduced diameter portion formed in the sleeve 11 is also filled with grease, the amount of grease filled can be increased as compared with the conventional case.

  Further, the grease filled in the grease reservoir 26 is subjected to a rotational centrifugal force as the sleeve 11 rotates together with the rotating shaft, and from the through-hole 25 formed at the central portion in the axial direction of the clutch inner ring 21 or from both side portions in the axial direction. It can easily exude into the clutch space and provide good lubrication. Furthermore, since the grease is uniformly filled in the grease reservoir 26 by providing the supply groove 27, the grease can be supplied to all the lamp surfaces.

  Therefore, according to the pulley apparatus 10 with a built-in one-way clutch according to the present embodiment, the sleeve 11 has the grease reservoir 26, and the grease reservoir 26 includes the rollers 22 in the axial direction and the balls 17 of the support bearings 14 a and 14 b. In the meantime, at least a reduced diameter portion having a smaller diameter than the portion overlapping the lamp surface 21a in the axial direction is formed. As a result, the amount of grease filled can be increased by the volume of the grease reservoir 26 including the space formed radially outward of the reduced diameter portion, extending the life of the grease and improving the durable life of the one-way clutch 13. can do. In addition, since the grease reservoir 26 is provided on the inner diameter side of the one-way clutch 13, the grease retained therein can easily ooze out into the clutch space due to the rotational centrifugal force during use, and good lubrication can be performed.

  In the present embodiment, the through hole 25 is formed in the clutch inner ring 21, but the formation of the through hole 25 is optional, and grease filled in the grease reservoir 26 without forming the through hole 25 is used as the clutch inner ring. You may make it supply to clutch space from the axial direction both sides of 21. FIG.

(Second Embodiment)
Next, a pulley device with a built-in one-way clutch according to a second embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about a part equivalent to 1st Embodiment, and description is abbreviate | omitted or simplified.

  The pulley device 30 with a built-in one-way clutch of the present embodiment is different from that of the first embodiment in the shapes of the grease reservoir 32 and the supply groove 33 formed in the large diameter portion 11a of the sleeve 31. The plurality of grease reservoirs 32 are formed at predetermined intervals in the circumferential direction regardless of the position of the ramp surface 21a. Although not shown, the axial dimension of the grease reservoir 32 is designed to be smaller than the axial length of the large-diameter portion 11a and larger than the axial length of the clutch inner ring 22 as in the first embodiment. As a result, the grease reservoir 32 also forms a reduced diameter portion between the roller 22 in the axial direction and the ball 17 of the support bearings 14a and 14b, which is smaller in diameter than the portion overlapping the ramp surface 21a in the axial direction.

  Further, the supply groove 33 formed in the circumferential direction has an axial width larger than the axial dimension of the through-hole 25 and is located in the intermediate portion in the axial direction, and the bottom surface thereof is adjacent to the grease reservoir 32. And an arcuate surface 33b having a predetermined depth between the inclined surface 33a.

Also in the pulley device 30 with a built-in one-way clutch configured as described above, the sleeve 31 includes at least a grease reservoir 32 that configures a reduced diameter portion, and thus includes a space formed radially outward of the reduced diameter portion. The amount of grease filled can be increased by the volume of the grease reservoir 32, the life of the grease can be extended, and the durable life of the one-way clutch 13 can be improved. Further, since the grease reservoir 32 is provided on the inner diameter side of the one-way clutch 13, the grease held therein can easily ooze out into the clutch space by the rotational centrifugal force during use, and good lubrication can be performed.
Other configurations and operations are the same as those in the first embodiment.

  As a modification of the present embodiment, a sleeve 31 ′ having a grease reservoir 32 ′ and a supply groove 33 ′ may be formed as shown in FIG. 3. That is, the grease reservoir 32 'may be arranged at four positions in the circumferential direction at predetermined intervals, and the supply groove 33' is formed with an inclined surface 33a 'and a cylindrical surface 33b' as in the second embodiment. Consists of. Further, since the axial dimension of the grease reservoir 32 'has a length substantially equal to the axial direction length of the large diameter portion 11a, the lamp surface is interposed between the roller 22 and the balls 17 of the support bearings 14a and 14b in the axial direction. A reduced diameter portion having a smaller diameter than the portion overlapping with 21a in the axial direction is configured.

  In the sleeve 31 ′ shown in FIG. 3, the inner peripheral surface is a cylindrical space. However, as shown in FIG. 2, a screw thread and a tool hole for attaching to the auxiliary machine are appropriately processed. Moreover, in the said embodiment, although the cyclic | annular supply groove is formed in the axial direction intermediate part, two or more may be formed.

(Third embodiment)
Next, a pulley device with a built-in one-way clutch according to a third embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about a part equivalent to 1st Embodiment, and description is abbreviate | omitted or simplified.

The pulley device 40 with a built-in one-way clutch according to this embodiment is different from that according to the first embodiment in that a sponge-like lubricant absorbing member 41 is accommodated in the grease reservoir 26 of the sleeve 11. The lubricant absorbing member 41 is preliminarily impregnated with a lubricant such as grease or lubricating oil. When the pulley device 40 rotates, the lubricant is moved to the clutch side by centrifugal force to lubricate the one-way clutch 13. Further, when the pulley device 40 is stopped, it is possible to prevent the lubricant from being sucked by the lubricant absorbing member 41 and flowing out of the one-way clutch 13.
Other configurations and operations are the same as those in the first embodiment. Further, the lubricant absorbing member 41 may be accommodated in the supply groove 27 of the sleeve 11 and the through hole 25 of the clutch inner ring 21 in addition to the grease reservoir 26.

(Fourth embodiment)
Next, a pulley device with a built-in one-way clutch according to a fourth embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about a part equivalent to 1st Embodiment, and description is abbreviate | omitted or simplified.

  In the pulley device 50 with a built-in one-way clutch of the present embodiment, the shapes of the large-diameter portion 51a of the sleeve 51 and the clutch inner ring 52 of the one-way clutch 13 are different from those of the first embodiment. Specifically, the large-diameter portion 51a of the sleeve 51 has sleeve diameter-reduced portions 51c formed at both ends in the axial direction of the fitting portion 51b that is fitted to the clutch inner ring 52, and the clutch inner ring 52 has a cam surface. Inner ring diameter-reduced portions 52a are formed at both axial ends of 21a.

The outer diameter of the sleeve reduced diameter portion 51c is set larger than the diameter d of the chamfered end portions of the support bearings 14a and 14b and smaller than the outer diameter of the fitting portion 51b. Further, the axial length l ₁ of the sleeve diameter-reduced portion 51 c is appropriately set so that the outer peripheral surface of the diameter-reduced portion 51 c does not enter the clutch inner ring 52. Further, the axial length l ₂ of the inner ring reduced diameter portion 52a is set so as not to enter the portion of the cam surface 21a where the roller 22 is in rolling contact, and the wall thickness t is such that a pressure input that does not cause creep can be secured. Is set as appropriate.

  Therefore, a portion that overlaps the cam surface 21a in the axial direction between the roller 22 in the axial direction and the ball 17 of the support bearings 14a and 14b (in this embodiment, a portion where the cam surface 21a of the clutch inner ring 52 is formed) Since the sleeve diameter-reduced portion 51c and the inner ring diameter-reduced portion 52a are smaller than the diameter of the large-diameter portion 51a, the space formed radially outward of the sleeve diameter-reduced portion 51c and the inner ring diameter-reduced portion 52a is greased. By using it as a reservoir, the amount of grease can be increased, the life of the grease can be extended, and the durable life of the one-way clutch 13 can be improved. In addition, since the grease reservoir is provided on the inner diameter side of the one-way clutch 13, the grease retained therein can easily ooze out into the clutch space due to the rotational centrifugal force during use, and good lubrication can be performed.

Further, since a step where the support bearings 14a and 14b abut is formed between the sleeve reduced diameter portion 51 and the small diameter portion 11b of the sleeve 11, the support bearings 14a and 14b are reliably positioned in the axial direction.
Other configurations and operations are the same as those in the first embodiment. Further, the sleeve 51 and the clutch inner ring 52 of this embodiment may be formed in combination with the grease reservoir, supply groove, and through hole of the first to third embodiments.

(Fifth embodiment)
Next, a one-way clutch built-in pulley apparatus according to a fifth embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about a part equivalent to 4th Embodiment, and description is abbreviate | omitted or simplified.

  The one-way clutch-equipped pulley device 60 according to this embodiment differs from that of the fourth embodiment in the shapes of the large-diameter portion 61a of the sleeve 61 and the clutch inner ring 62 of the one-way clutch 13. Specifically, in the large-diameter portion 61a of the sleeve 61, the sleeve diameter-reduced portions 61c formed at both ends in the axial direction of the fitting portion 61b fitted to the clutch inner ring 62 are chamfered end portions of the support bearings 14a and 14b. The flange portion 61d is larger than the diameter, and the remaining portion is formed with a smaller diameter than the outer diameter of the small diameter portion 11b. Further, in the clutch inner ring 62, the inner ring reduced diameter portions 62a formed at both axial ends of the cam surface 21a are set so that the outer diameter gradually decreases toward the outer side in the axial direction.

  Therefore, as in the fourth embodiment, the sleeve reduced diameter portion 61c and the inner ring reduced diameter portion are smaller in diameter than the portion overlapping the cam surface 21a in the axial direction between the roller 22 in the axial direction and the ball 17 of the support bearings 14a and 14b. 62a, the space formed on the radially outer side of the sleeve reduced diameter portion 61c and the inner ring reduced diameter portion 62a can be used as a grease reservoir, whereby the amount of grease can be increased and the life of the grease can be extended. The durability life of the one-way clutch 13 can be improved. In addition, since the grease reservoir is provided on the inner diameter side of the one-way clutch 13, the grease retained therein can easily ooze out into the clutch space due to the rotational centrifugal force during use, and good lubrication can be performed.

Further, since the flange portion 61d against which the support bearings 14a and 14b abut is formed between the sleeve reduced diameter portion 61 and the small diameter portion 11b of the sleeve 11, the support bearings 14a and 14b are reliably positioned in the axial direction. .
In addition, about another structure and effect | action, it is the same as that of the thing of 4th Embodiment.

(Sixth embodiment)
Next, a pulley device with a built-in one-way clutch according to a sixth embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about a part equivalent to 1st Embodiment, and description is abbreviate | omitted or simplified.

  In the pulley device 70 with a built-in one-way clutch according to the present embodiment, the clutch inner ring of the one-way clutch 13 is formed integrally with the sleeve 71. That is, a cam surface 21a that is a clutch inner ring raceway surface is formed on the large diameter portion 71a of the sleeve 71, and a sleeve reduced diameter portion 71b that is smaller in diameter than the small diameter portion 11b is formed at both axial ends of the cam surface 21a. The The sleeve reduced diameter portion 71b is formed from a position near the end face of the roller 22 to a position near the end face of the support bearings 14a and 14b, and the support bearings 14a and 14b are positioned by using a jig or the like.

Therefore, in the pulley device 70 with a built-in one-way clutch according to the present embodiment, the sleeve 71 has a large diameter portion that overlaps the cam surface 21a in the axial direction between the roller 22 in the axial direction and the ball 17 of the support bearings 14a and 14b. Since the sleeve reduced diameter portion 71b having a smaller diameter than 71a is provided, the amount of grease can be increased by using the space formed radially outward of the sleeve reduced diameter portion 71b as a grease reservoir. The service life can be extended and the service life of the one-way clutch 13 can be improved. In addition, since the grease reservoir is provided on the inner diameter side of the one-way clutch 13, the grease retained therein can easily ooze out into the clutch space due to the rotational centrifugal force during use, and good lubrication can be performed.
In addition, about another structure and effect | action, it is the same as that of the thing of 5th Embodiment.

(Seventh embodiment)
Next, a pulley device with a built-in one-way clutch according to a seventh embodiment of the present invention will be described with reference to FIG.

  As shown in FIG. 8, in the one-way clutch built-in pulley apparatus 80 according to the seventh embodiment, a sleeve 81 fixed to the rotation shaft S of an auxiliary machine such as a starter motor, and a sleeve 81 radially outward of the sleeve 81. A one-way clutch 83 and a pair of support bearings 84a and 84b are disposed between the pulley 82 and a pulley 82 having a belt groove 82a on which the endless belt B is suspended.

  The one-way clutch 83 has a tendency that when the engine is started, the rotational angular speed of the rotation shaft S of the starter motor is higher than the rotational angular speed of the crankshaft of the engine, that is, the sleeve 81 rotates relative to the pulley 82 in a predetermined direction. Only in this case, the rotational force is transmitted between the sleeve 81 and the pulley 82. For this reason, the ramp surface 82b is formed on the clutch outer ring, and the cylindrical surface 81a which is the clutch inner ring raceway surface is formed on the clutch inner ring. In this embodiment, the clutch outer ring is formed integrally with the pulley 82, and the clutch inner ring is formed integrally with the sleeve 81. Therefore, the ramp surface 82b and the cylindrical surface 81a are formed on the pulley 82 and the sleeve 81, respectively. The one-way clutch 83 further includes a roller 85, a retainer 86, and a spring (not shown) as in the first embodiment.

  Further, the support bearings 84a and 84b of this embodiment are a combination of a roller bearing having a rolling element as a roller 87 and a ball bearing having a rolling element as a ball 88. In these support bearings 84a and 84b, both the outer ring and the inner ring are formed integrally with the pulley 82 and the sleeve 81, and the outer ring raceway surfaces 82c and 82d and the inner ring raceway surfaces 81b and 81c are formed on the pulley 82 and the sleeve 81, respectively. The The support bearings 84a and 84b further include a cage 89 and a seal member 90 as in the first embodiment.

  Also in the pulley device 80 with a built-in one-way clutch configured as described above, the sleeve 81 has a cylindrical surface 81a formed between the roller 85 in the axial direction and the rollers 87 and balls 88 of the support bearings 84a and 84b. Sleeve reduced diameter portions 81d and 81e having a smaller diameter than the portion are formed. For this reason, by using the space formed radially outward of the sleeve reduced diameter portions 81d and 81e as a grease reservoir, the amount of grease can be increased, the life of the grease can be extended, and the one-way clutch 83 The durability life can be improved. In addition, since the grease reservoir is provided on the inner diameter side of the one-way clutch 83, the grease retained therein can easily ooze out into the clutch space due to the rotational centrifugal force during use, and good lubrication can be performed.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.

  In the present embodiment, the support bearings are disposed at both axial ends, but the support bearings may be disposed only on one axial side.

  Further, the one-way clutch of the present invention may be a roller clutch using an engaging roller as in the present embodiment, a sprag clutch using a sprag as an engaging member, or a cam clutch using a cam as an engaging member.

  In addition, when the pulley device with a built-in one-way clutch is used for driving an auxiliary machine of an engine idle stop mechanism, an auxiliary machine such as a compressor is driven by a dedicated motor when the engine is stopped. Although it does not receive, it becomes the structure which receives the rotation fluctuation generate | occur | produced from the motor for an auxiliary machine drive.

(A) is a longitudinal cross-sectional view of the one-way clutch built-in type pulley apparatus which concerns on 1st Embodiment of this invention, (b) is a fragmentary sectional view along the II line of (a). (A) is a longitudinal cross-sectional view of the pulley apparatus with a built-in one-way clutch which concerns on 2nd Embodiment of this invention, (b) is a fragmentary sectional view along the II-II line of (a). (A) is the perspective view which notched the sleeve which concerns on the modification of 2nd Embodiment, (b) is a longitudinal cross-sectional view of a sleeve, (c) is a cross-sectional view of a sleeve. (A) is a longitudinal cross-sectional view of the one-way clutch built-in type pulley apparatus which concerns on 3rd Embodiment of this invention, (b) is a fragmentary sectional view along the IV-IV line of (a). (A) is a longitudinal cross-sectional view of the pulley apparatus with a built-in one-way clutch which concerns on 4th Embodiment of this invention, (b) is the V section expanded sectional view of (a). It is a fragmentary sectional view of the one-way clutch built-in type pulley apparatus which concerns on 5th Embodiment of this invention. It is a fragmentary sectional view of the one-way clutch built-in type pulley apparatus which concerns on 6th Embodiment of this invention. It is a longitudinal cross-sectional view of the one-way clutch built-in type pulley apparatus which concerns on 7th Embodiment of this invention. It is sectional drawing of the conventional one-way clutch built-in type pulley apparatus.

Explanation of symbols

10, 30, 40, 50, 60, 70, 80 One-way clutch built-in pulley device 11, 31, 31 ', 51, 61, 71, 81 Sleeve 12, 82 Pulley 13, 83 One-way clutch 14a, 14b, 84a , 84b Support bearing 17, 88 ball (rolling element)
87 Roller (rolling element)
20 Clutch outer ring 21, 52, 62 Clutch inner ring 22, 85 Roller (engagement element)
23, 86 Clutch retainer 24 Spring 25 Through hole 26, 32, 32 'Grease reservoir (reduced diameter portion)
27, 33, 33 'Supply groove 41 Lubricant absorbing member 51c, 61c, 71b, 81d, 81e Sleeve diameter reducing portion 52a, 62a Inner ring diameter reducing portion

Claims (1)

Sleeve,
A pulley disposed around the sleeve and concentrically with the sleeve;
Rotation force is transmitted between the sleeve and the pulley only when the sleeve and the pulley are disposed between the sleeve and the pulley and one of the sleeve and the pulley tends to rotate relative to the other in a predetermined direction. A one-way clutch to
A support bearing that is disposed between the sleeve and the pulley and allows relative rotation between the sleeve and the pulley;
A one-way clutch built-in pulley device comprising:
The one-way clutch includes at least an engagement element, and a clutch inner ring having a clutch inner ring raceway surface to which the engagement element is capable of rolling, and formed integrally with the sleeve or separately.
At least one of the sleeve and the clutch inner ring has a reduced diameter portion having a smaller diameter than the portion overlapping the clutch inner ring raceway surface in the axial direction between the engagement element in the axial direction and the rolling element of the support bearing. One-way clutch built-in type pulley device.

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