JP2006307949A - Pulley device for automobile auxiliary machinery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pulley device for automobile auxiliary machinery capable of preventing water from intruding into an automobile auxiliary machinery side and reducing cost and having excellent general versatility. <P>SOLUTION: This pulley device 10 for the automobile auxiliary machinery attachable to a rotary shaft of the automobile auxiliary machinery is provided with a projection 28 extending in the radial direction on an automobile auxiliary machinery side on an outer peripheral face of a pulley 12 arranged concentrically with the rotary shaft around the rotary shaft. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pulley apparatus for an automobile auxiliary machine, and in particular, used as an auxiliary machine for an automobile auxiliary machine by a starter, an alternator, a crank pulley, a compressor, an engine idle stop or an engine start. The present invention relates to a pulley apparatus for an automotive auxiliary machine.

  In general, a driven pulley is fixed to an end of a rotating shaft of an automobile auxiliary machine such as an alternator, and an endless belt is stretched between a driving pulley fixed to an end of an engine crankshaft. Is used to drive. In addition, the driven pulley allows the transmission of power from the endless belt to the rotating shaft when the running speed of the endless belt is constant or increases, and the driven pulley is driven when the running speed of the endless belt tends to decrease. A pulley apparatus incorporating a one-way clutch so as to allow relative rotation between the pulley and the rotating shaft is known (see, for example, Patent Documents 1 and 2).

  As shown in FIG. 7, for example, a one-way clutch built-in pulley device 100 incorporated in an automobile accessory includes a driven pulley 101 over which a drive belt from a drive pulley fixed to an engine crankshaft is stretched, and not shown. A sleeve 102 for fixing the rotating shaft of the auxiliary machine is provided, 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.

  In the pulley apparatus 100 with a built-in one-way clutch shown in FIG. 7, the rotation shaft of the auxiliary machine is inserted from one end (the right side in the figure) of the sleeve 101, and a tool (see FIG. The rotating shaft is fastened and fixed to the screw portion 102b formed in the intermediate portion of the sleeve 102. Further, a belt groove 109 is formed on the outer peripheral surface of the driven pulley 101, and a pair of wall portions 110, which are formed on both sides in the axial direction of the belt groove 109 so as to be higher in the radial direction than the protruding portion 109a between the grooves. 111 is provided, and the pair of wall portions 110 and 111 are positioned at both axial ends of the driven pulley 101.

  8 to 10, the pulley devices 120, 130, and 140 with a built-in one-way clutch differ from the pulley device 100 with a built-in one-way clutch in the shapes of the driven pulleys 111, 121, and 131. In the pulley device 120 with a built-in one-way clutch shown in FIG. 8, the belt groove 109 and the pair of wall portions 110 and 111 of the driven pulley 121 are formed on the side opposite to the side on which the automobile accessory is mounted. A flat cylindrical portion 122 is formed on the outer peripheral surface of the driven pulley 121 on the side.

  In the one-way clutch built-in pulley device 130 shown in FIG. 9, the belt groove 109 of the driven pulley 131 is formed closer to the center in the axial direction, and the driven pulley 131 on both sides in the axial direction of the pair of wall portions 110 and 111. Cylindrical portions 132 and 133 are formed on the outer peripheral surface.

  Furthermore, in the one-way clutch built-in pulley apparatus 140 shown in FIG. 10, the belt groove 109 and the pair of wall portions 110 and 111 of the driven pulley 141 are formed close to the automobile auxiliary machine side, and the driven on the anti-automobile auxiliary machine side is formed. A flat cylindrical portion 142 is formed on the outer peripheral surface of the pulley 141.

Moreover, in the pulley unit of patent document 1 and 2, in order to suppress permeation of the water to the motor vehicle auxiliary machine side, comprising a labyrinth between an auxiliary machine and a pulley is devised.
JP-A-11-270658 JP 2002-130432 A

  By the way, in the pulley apparatus 100, 120, 130, 140 with a built-in clutch shown in FIG. 7 to FIG. 10, waterproofing measures are not taken, and there is a possibility that water may enter the auxiliary equipment side. In addition, in the pulley unit described in Patent Documents 1 and 2, the labyrinth is configured to provide a waterproof measure, but not only the pulley but also the auxiliary machine needs to be processed into a special shape and lacks versatility. It was. In addition, the pulley also has a problem in that the machining cost increases because machining with high accuracy is required to form the labyrinth.

  The present invention has been made in view of the circumstances as described above, and an object of the present invention is to reduce the intrusion of water on the side of the automobile auxiliary equipment and to be a low-cost automobile excellent in versatility. An object is to provide a pulley device for an auxiliary machine.

The above object of the present invention can be achieved by the following constitution.
(1) A pulley device for an automotive accessory that can be attached to a shaft of an automotive accessory, and is arranged on the outer peripheral surface of the pulley that can be arranged around the shaft and concentrically with the shaft in a radial direction on the automotive accessory side. A pulley apparatus for an automobile auxiliary machine, characterized in that an extending protrusion is formed.
(2) A sleeve that is externally fitted to the shaft and is disposed radially inward of the pulley, and is disposed between the sleeve and the pulley, and one of the sleeve and the pulley is predetermined with respect to the other. And a one-way clutch that transmits a rotational force between the sleeve and the pulley only when it tends to rotate relative to each other in a direction. .

  According to the present invention, the outer peripheral surface of the pulley is formed with a protrusion extending in the radial direction on the side of the automobile accessory, so that water can be prevented from entering the side of the automobile accessory and It is possible to provide a low-cost pulley apparatus for automobile auxiliary equipment that is excellent in performance.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a pulley device for an auxiliary vehicle according to each embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a longitudinal sectional view for explaining a pulley device with a built-in one-way clutch for an alternator as a pulley device for an auxiliary vehicle of the present invention. 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 automobile auxiliary machine such as an alternator, and a sleeve in which a rotating shaft (not shown) is fitted. 11. A threaded portion 11a for fastening and fixing a rotation shaft inserted from one end side (the right side in the figure) of the sleeve 11 is formed on the inner peripheral surface of the axially intermediate portion of the sleeve 11, and the other end side of the sleeve 11 is A serration or hexagonal hole 11b for locking a tool (not shown) is formed to fasten the rotating shaft.

  Around the sleeve 11, a pulley 12 having a belt groove 25 formed on the outer peripheral surface is disposed concentrically with the sleeve 11. In addition, a one-way clutch 13 that is a clutch portion is disposed between the outer peripheral surface of the sleeve 11 and the inner peripheral surface of the pulley 12 in the axial intermediate portion of the annular space formed therebetween. A pair of support bearings 14a and 14b such as deep groove ball bearings are disposed at both ends in the axial direction of the space so as to sandwich the one-way clutch 13. The shape of the belt groove 25 can be designed to have an arbitrary shape such as a V groove, a poly V groove, or a tooth groove.

  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 14 a and 14 b is disposed between the raceway surface of the inner ring 15 and the outer ring 16, the inner ring 15 fitted on the outer circumferential surface of the sleeve 11, the outer ring 16 fitted on the inner circumferential surface of the pulley 12. A plurality of balls 17 that are rolling elements, a cage (not shown) that holds the balls 17 in a freely rollable manner, and a seal that prevents intrusion of foreign matter from the outside and leakage of a lubricant such as grease from the inside. It has a member (not shown).

  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 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 holder 23 having a plurality of pockets for individually accommodating the rollers 22 and a spring (not shown) that elastically presses the rollers 22 in the locking direction. .

  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).

  In addition, a pair of wall portions 26 and 27 are formed on both sides in the axial direction of the belt groove 25 formed in the pulley 12 of the present embodiment so as to be higher in the radial direction than the inter-groove protrusion 25a. The wall portions 26 and 27 are formed at both ends of the pulley 12 in the axial direction. The pair of wall portions 26 and 27 are different from each other in height in the radial direction. The wall portion 27 located on the side of the automobile auxiliary machine is formed to be higher than the wall part 26 on the side of the non-automobile auxiliary machine by a height h in the radial direction, and the portion extending in the radial direction forms an annular protrusion 28. , It has a function of suppressing the ingress of water into automobile auxiliary equipment.

  Further, the projection 28 has an inclined surface 28a that is continuously inclined from the belt groove 25 toward the anti-automobile accessory side. When centrifugal force is applied to the pulley 12, the protrusion 28 extends along the inclined surface 28a. Water can be scattered radially outward. The inclined surface 28a is formed at the same time when the belt groove 25 is processed.

  Therefore, according to the pulley device 10 with a built-in one-way clutch of the present embodiment, the protrusion 28 extending in the radial direction is formed on the vehicle auxiliary machine side on the outer peripheral surface with the pulley 12. Can be suppressed, and an auxiliary machine having an ordinary shape can be used. Thus, a low-cost pulley device 10 having excellent versatility can be provided.

(Second Embodiment)
Next, a pulley device for an automobile auxiliary machine 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.

  A pulley device 30 with a built-in one-way clutch for an automobile auxiliary machine according to this embodiment is different from that of the first embodiment in the shape of the pulley 31. In the pulley device 30 shown in FIG. 2, a pair of wall portions 33 and 34 formed on both sides in the axial direction of the belt groove 32 of the pulley 31 are provided on the side opposite to the automobile accessory side of the pulley 31 and on the side of the automobile accessory side. Formed on the inner side in the axial direction from the portion. For this reason, the belt groove 32 of the pulley 31 is formed close to the non-automobile accessory side, and a flat cylindrical portion 35 is formed on the outer peripheral surface of the pulley 31 on the accessory side.

An annular protrusion 36 having a height h extending in the radial direction is formed at the end of the cylindrical portion 35 on the side of the automobile accessory, and has a function of suppressing water from entering the automobile accessory. Further, the protrusion 36 also has an inclined surface 36a directed toward the anti-automobile accessory side, and when centrifugal force acts on the pulley 31, water adhering along the inclined surface 36a is scattered radially outward. Let
Other configurations and operations are the same as those of the first embodiment.

(Third embodiment)
Next, a description will be given, with reference to FIG. 3, of a pulley device for an automobile auxiliary machine in a third embodiment of the present invention. In addition, the same code | symbol is attached | subjected about a part equivalent to 1st Embodiment, and description is abbreviate | omitted or simplified.

  A pulley apparatus 40 with a built-in one-way clutch, which is a pulley apparatus for an automotive auxiliary machine according to this embodiment, differs from that of the first embodiment in the shape of a pulley 41. In the pulley device 40 shown in FIG. 3, a pair of wall portions 43 and 44 formed on both sides in the axial direction of the belt groove 42 of the pulley 41 are formed on the inner side in the axial direction from both axial ends of the pulley 41. For this reason, the belt groove 42 of the pulley 41 is formed near the center in the axial direction, and flat cylindrical portions 45 and 46 are formed on the outer peripheral surfaces on both sides in the axial direction of the pulley 41.

An annular protrusion 47 having a height h extending in the radial direction is formed at the end of the cylindrical portion 46 on the side of the automobile accessory, so that water can enter the automobile accessory. It has a function to suppress. Further, the protrusion 47 also has an inclined surface 47a directed toward the anti-automobile accessory side, and when centrifugal force acts on the pulley 41, water adhering along the inclined surface 47a is scattered radially outward. Let
Other configurations and operations are the same as those of the first embodiment.

(Fourth embodiment)
Next, a pulley apparatus for an automobile auxiliary machine 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.

  A pulley device 50 with a built-in one-way clutch, which is a pulley device for an automotive auxiliary machine according to this embodiment, is different from that of the first embodiment in the shape of the pulley 51. In this pulley apparatus 50 shown in FIG. 4, a pair of wall portions 53 and 54 formed on both sides in the axial direction of the belt groove 52 of the pulley 51 are axially inward from the end on the side opposite to the auxiliary equipment of the pulley 51, It is formed at each auxiliary machine side end. For this reason, the belt groove 52 of the pulley 51 is formed close to the automobile accessory side, and a flat cylindrical portion 55 is formed on the outer peripheral surface of the pulley 51 on the side opposite to the automobile accessory side.

Further, an annular protrusion 56 that extends further in the radial direction by a height h from the outer peripheral surface of the walls 53, 54 is formed at the end of the wall 54 on the side of the automobile accessory. It has a function to suppress water intrusion into the machine. Further, the protrusion 56 also has an inclined surface 56a directed to the side opposite to the automobile auxiliary equipment, and when centrifugal force acts on the pulley 12, the water adhering along the inclined surface 56a is scattered radially outward. Let
Other configurations and operations are the same as those of the first embodiment.

(Fifth embodiment)
Next, a pulley apparatus for an automobile auxiliary machine according to a fifth embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected about a part equivalent to 1st Embodiment, and description is abbreviate | omitted or simplified.

  A pulley device 60 with a built-in one-way clutch, which is a pulley device for an automotive auxiliary machine according to this embodiment, is different from that of the first embodiment in the shape of a pulley 61. That is, in this pulley apparatus 60 shown in FIG. 5, a gear pulley 61 is applied instead of a belt pulley, and a gear groove 62 is formed on the side of the pulley 61 opposite to the automobile accessory. A cylindrical portion 63 is formed on the outer peripheral surface of the pulley 61 on the side of the automobile accessory.

  Further, an annular protrusion 64 having a height h extending in the radial direction is formed at the end of the cylindrical portion 63 on the side of the automobile accessory, and has a function of suppressing water intrusion into the automobile accessory. Further, the protrusion 64 also has an inclined surface 64a directed toward the anti-automobile accessory side, and when centrifugal force acts on the pulley 61, the water adhering along the inclined surface 64a is scattered radially outward. Let

When this gear pulley 61 is formed, it is first formed into a pulley material 61 ′ as shown in FIG. 6A including surplus by forging, and then partitioned by a dotted line in FIG. 6A. By machining the portion R, the gear pulley 61 is finished as shown in FIG. 6B, and the protrusion 64 is formed simultaneously with the lightening. Thus, since the gear pulley 61 is formed by machining the surplus portion, the volume to be cut is reduced by the provision of the protrusion 64 as compared with the case where the cylindrical portion 63 is cut flat. Time can be shortened.
Other configurations and operations are the same as those of the first embodiment.

  In the case of pulleys having protrusions in the second and third embodiments as well, when being formed by forging and machining, the cutting volume is similarly reduced, so that the machining time can be shortened.

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

  The projection of the present invention can be formed by a press pulley made of sheet metal, but in a pulley apparatus that requires rigidity and accuracy, it is preferably formed by forging and machining as in the embodiment.

  Further, the protrusion of the present invention only needs to be formed on the automobile auxiliary equipment side of the outer peripheral surface of the pulley, and may be formed at the axial end of the automobile auxiliary equipment side as in the present embodiment, or the axial end. It may be formed near the portion. Further, the height h of the protrusion is arbitrarily set according to the height of the outer peripheral surface of the automobile auxiliary machine.

  The pair of support bearings of the present invention may be of a type other than the deep groove ball bearing, respectively, one may be a ball bearing, the other may be a combination of roller bearings, or a roller bearing and a thrust receiver, respectively. It may be configured. Further, at least one support bearing may be disposed on one axial side. Further, the inner ring or the outer ring of the support bearing may be integrated with the pulley or the sleeve, that is, constituted by the inner peripheral surface of the pulley or the outer peripheral surface of the sleeve.

  Moreover, the clutch part of this invention should just transmit a rotational force between a sleeve and a pulley, and it becomes the tendency for a pulley to rotate relatively in a predetermined direction with respect to a sleeve like this embodiment. Only in such a case, a one-way clutch that transmits the rotational force may be used, or the outer peripheral surface of the clutch inner ring may be a cylindrical surface and the inner peripheral surface of the clutch outer ring may be a cam surface, and the sleeve rotates relative to the pulley in a predetermined direction. A one-way clutch that transmits a rotational force may be used only when a tendency occurs. Alternatively, it may be a two-way clutch capable of transmitting a rotational force in both directions between the sleeve and the pulley. Further, the clutch outer ring may be integrated with the pulley, and the clutch inner ring may be integrated with the sleeve.

  Furthermore, the clutch portion 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.

  Also, when the pulley device with a built-in clutch is used for driving an auxiliary machine of an engine idle stop mechanism, the auxiliary machine such as a compressor is driven by a dedicated motor when the engine is stopped, so that the engine rotation fluctuation is not affected. However, it becomes a structure which receives the rotation fluctuation which generate | occur | produces from the motor for an auxiliary machine drive.

It is a longitudinal cross-sectional view of the one-way clutch built-in type pulley apparatus which concerns on 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the one-way clutch built-in type pulley apparatus which concerns on 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the one-way clutch built-in type pulley apparatus which concerns on 3rd Embodiment of this invention. It is a longitudinal cross-sectional view of the one-way clutch built-in type pulley apparatus which concerns on 4th Embodiment of this invention. The one-way clutch built-in type pulley apparatus which concerns on 5th Embodiment of this invention is shown, (a) is the longitudinal cross-sectional view, (b) is a side view. (A) shows the state before machining of the pulley of FIG. 5, and (b) shows the pulley after machining. It is a longitudinal cross-sectional view of the conventional one-way clutch built-in type pulley apparatus. It is a longitudinal cross-sectional view of another conventional one-way clutch built-in pulley apparatus. It is a longitudinal cross-sectional view of the conventional other one-way clutch built-in type pulley apparatus. It is a longitudinal cross-sectional view of the conventional other one-way clutch built-in type pulley apparatus.

Explanation of symbols

10, 30, 40, 50, 60 Pulley device with built-in clutch 11 Sleeve 12, 31, 41, 51, 61 Pulley 13 One-way clutch (clutch part)
14a, 14b Support bearing 28, 36, 47, 56, 64 Protrusion

Claims (2)

  A pulley device for an automotive accessory that can be attached to a shaft of an automotive accessory, and a protrusion extending in a radial direction on the side of the automotive accessory is provided on an outer peripheral surface of the pulley that can be disposed concentrically with the shaft around the shaft. A pulley apparatus for an automobile auxiliary machine characterized by being formed.   A sleeve that is externally fitted to the shaft and disposed radially inward of the pulley, and is disposed between the sleeve and the pulley, and one of the sleeve and the pulley is relative to the other in a predetermined direction. 2. The pulley apparatus for an auxiliary vehicle according to claim 1, further comprising a one-way clutch that transmits a rotational force between the sleeve and the pulley only when it tends to rotate.

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