JP2007100755A - 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 suppressing the occurrence of an edge load of a roller and improving moment load resistance by reducing the inclination of a contact face pressure distribution on a roller generating line of the one-way clutch. <P>SOLUTION: In the pulley device 10 with the built-in one-way clutch, the axial direction center of the roller 22 and the axial direction center of a belt groove 12a of the pulley 12 are offset from each other. A ramp face 21a of a clutch inner ring 21 brought into rolling contact with the roller 22 has different outer diameters for both ends in the axial direction, and the small diameter side end 21b of the side of the smaller diameter is arranged further on the axial direction central side of the belt groove 12a than the axial direction center of the roller 22. <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.

  Generally, a driven pulley is fixed to the end of a rotating shaft of an auxiliary machine for automobiles such as an alternator, and an endless belt is stretched between a driving pulley fixed to an end of an engine crankshaft, It is used to drive the machine. 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 is known (see, for example, Patent Document 1) so that relative rotation between a pulley and a rotating shaft is free.

  As shown in FIG. 4, for example, a pulley device 100 with a built-in one-way clutch incorporated in an automotive auxiliary machine includes a driven pulley 101 on which a driving belt from a driving pulley fixed to a crankshaft of an engine is stretched, and an auxiliary pulley 101. 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 that individually accommodate the rollers 107, and a spring 109 that is supported by the clutch holder 108 and elastically presses the rollers 107 in the locking direction. It has.

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 cannot be relatively rotated (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.
Japanese Patent Laid-Open No. 2003-4125 JP-A-11-94054

  Incidentally, in the pulley device 100 with a built-in one-way clutch shown in FIG. 4, the operating point of the belt load F applied from the radial direction is offset from the axial center of the roller 107 of the one-way clutch 103 due to restrictions on the belt layout. is doing. In this case, a moment load acts on the one-way clutch in addition to the pure radial load, and the contact surface pressure distribution p on the roller bus has an inclination as shown in FIG. 4B, and the roller 107 is slightly tapered. There is a possibility that the pulley 101 is tilted by being deformed to.

  When the inclination angle of the pulley 101 is increased in this way, wear or peeling occurs at the edge portion of the roller 107, or a meshing failure occurs in the one-way clutch 103, and the components of the one-way clutch 103 wear or generate heat. There is a possibility that the deterioration of the grease is promoted.

  The present invention has been made in view of the above-described circumstances, and its purpose is to reduce the inclination of the contact surface pressure distribution on the roller bus of the one-way clutch, and to generate the roller edge load. An object of the present invention is to provide a pulley device with a built-in one-way clutch that can suppress and increase the moment load resistance.

The above object of the present invention can be achieved by the following constitution.
(1) Sleeve and
A pulley having a belt groove arranged concentrically with the sleeve around the sleeve and around which an endless belt can be wound;
A clutch inner ring that is disposed between the sleeve and the pulley and is provided separately from the sleeve and is fitted on the sleeve; a clutch outer ring that is provided integrally with or separately from the pulley; and a clutch inner ring and a clutch outer ring A plurality of rollers arranged in a wedge space formed between the clutch holder that holds the rollers at predetermined intervals in the circumferential direction, and a direction in which the rollers are supported by the clutch holder in a narrow direction of the wedge space A one-way clutch provided with an elastic member biasing
A one-way clutch built-in pulley device comprising:
The axial center of the roller and the axial center of the belt groove of the pulley are offset from each other,
The engagement portion of the inner ring of the clutch with which the roller is in contact has different outer diameters at both axial ends, and the smaller diameter end on the smaller outer diameter side is the axial center of the belt groove from the axial center of the roller. One-way clutch built-in pulley device, characterized in that it is arranged on the side.
(2) The one-way clutch built-in pulley apparatus according to (1), further comprising a pair of support bearings disposed between the sleeve and the pulley and on both sides in the axial direction of the one-way clutch.
(3) With a sleeve,
A pulley having a belt groove arranged concentrically with the sleeve around the sleeve and around which an endless belt can be wound;
A clutch inner ring, a clutch outer ring, a plurality of rollers arranged in a wedge space formed between the clutch inner ring and the clutch outer ring, and a roller circumferentially disposed between the sleeve and the pulley. A one-way clutch comprising: a clutch retainer that retains a predetermined distance in the direction; and an elastic member that is supported by the clutch retainer and biases the roller in a narrow direction of the wedge space;
A one-way clutch built-in pulley device comprising:
The axial center of the roller and the axial center of the belt groove of the pulley are offset from each other,
Either one of the outer peripheral surface of the clutch inner ring and the inner peripheral surface of the clutch outer ring has a ramp surface formed at a predetermined interval in the circumferential direction.
The one-way clutch characterized in that the ramp surface is formed with different diameters at both axial ends so that the axial clearance in the wedge space is larger on the axial center side of the belt groove than on the axial center of the roller. Built-in pulley device.

  According to the present invention, the axial center of the roller and the axial center of the belt groove of the pulley are offset from each other, and the fitting portion of the clutch inner ring to which the roller rolls is different in outer diameter at both axial end portions. The small-diameter side end portion on the small outer diameter side is disposed closer to the axial center side of the belt groove than the axial center of the roller, so that the slope of the contact surface pressure distribution on the roller bus of the one-way clutch is increased. This can reduce the occurrence of roller edge loading and increase moment load resistance.

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

  FIG. 1 is a longitudinal sectional view for explaining a pulley device with a built-in one-way clutch for an alternator according to this embodiment. As shown in FIG. 1, a pulley apparatus 10 with a built-in one-way clutch according to this 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. A pair of support bearings 14a and 14b which are ball bearings, such as a deep groove ball bearing, are arrange | positioned at both ends, ie, the axial direction both sides of the one-way clutch 13, for example. 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.

  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 18 that holds the balls 17 in a freely rolling manner, and a seal member 19 that prevents the intrusion of foreign matter from the outside and the leakage of a lubricant such as grease from the inside. is doing.

  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 that are engaging members rotatably disposed therebetween. The outer peripheral surface of the clutch inner ring 21 forms a cam surface in which a plurality of concave ramp surfaces 21a, which are fitting portions to which the roller 22 is brought into rolling contact, are provided at predetermined intervals in the circumferential direction. The roller 22 is 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 24 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 higher 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 roller 22 is released, and the relative rotation between the pulley 12 and the sleeve 11 becomes free (overrun state).

In the above-described pulley 10, the belt groove 12a from restriction or the like on belt layout, with its axial center O ₁ is offset from the axial center O ₂ of the roller 22 of the one-way clutch 13, the alternator is disposed It is formed to be biased to the side to be done. Accordingly, the belt load F caused by the belt wound around the belt groove 12 a acts at a position offset from the center of the roller 22 in the axial direction. The pair of support bearings 14a disposed on both axial sides of the one-way clutch 13, 14b axially intermediate point between the fulcrum of is a substantially coincident position with the axial center O ₂ of the roller 22, a pair support bearings 14a, also the axial center O ₁ of the axially intermediate point and the belt groove 12a between fulcrum 14b becomes position offset.

Further, as shown in FIG. 1 (b), the ramp surface 21a of the clutch inner ring 21 has a predetermined taper angle in the axial direction, so that the outer diameter is different at both axial ends, and the outer diameter is smaller. The small-diameter side end portion 21b is disposed on the alternator side, that is, on the axial center side of the belt groove from the axial center of the roller, and the large-diameter side end portion 21c on the side having a larger outer diameter than the small-diameter side end portion It is arranged on the free end side of the apparatus, that is, on the axial center O ₁ side of the roller from the axial center O ₂ of the belt groove. Accordingly, the axial clearance in the wedge space is larger on the axial center O ₁ side of the belt groove 12 a than the axial center O ₂ of the roller 22. FIG. 1B exaggerates the taper shape of the lamp surface 21a.

  As a result, the belt load F acts on the roller 22 of the one-way clutch 13 substantially equally, so that the contact surface pressure distribution p on the roller bus is equalized as shown in FIG. Generation is suppressed and moment load resistance can be increased.

  Further, the predetermined taper angle of the ramp surface 21a with respect to the axis X of the pulley device 10 is set to be approximately equal to the misalignment angle generated by the inclination angle of the pulley 12 due to the belt load F, and is 0.3 μm / mm or more and 3 μm. / Mm or less is preferable. If it is less than 0.3 μm, there is a possibility that the above effect cannot be obtained sufficiently. If it exceeds 3 μm / mm, the inclination of the roller 22 becomes excessive and the large-diameter end 21c side of the ramp surface 21a The edge load of the roller 22 may occur at In addition, the clutch inner ring | wheel 21 of this embodiment is formed by press molding.

Therefore, according to the pulley device 10 with a built-in clutch of the present embodiment, the axial center O ₂ of the roller 22 and the axial center O ₁ of the belt groove 12a of the pulley 12 are offset from each other, and the clutch with which the roller 22 rolls is contacted. ramp surface 21a of the inner ring 21 is different from the outer diameter in the axial end portion, smaller diameter end 21b of the outer diameter smaller side, the axial center O of the belt groove 12a than the axial center O ₂ of the roller 22 Since it is arranged on the ₁ side, the inclination of the contact surface pressure distribution on the roller bus of the one-way clutch 13 is reduced, the occurrence of edge load of the roller 22 is suppressed, and the moment load resistance is increased. Can do.
Incidentally, the cylindrical surface 20a which is formed on the inner peripheral surface of the clutch outer ring 20 is also as axial clearance in the wedge space becomes larger in the axial center O ₁ side of the belt groove 12a axial center O ₂ of the roller 22, The diameters may be different at both ends in the axial direction.

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

In this embodiment, the belt groove 12a of the pulley 12, as has been formed to be offset to the alternator side with respect to the axial center O ₂ of the roller 22, the belt groove 12a is shown in FIGS. 2 (a) In addition, it may be formed offset to the free end side. In this case, the ramp surface 21a of the clutch inner ring 21, as shown in FIG. 2 (b), the axial center _{O 1} side of the belt groove 12a smaller diameter end 21b is against the axial center _{O 2} of the roller 22, In other words, it may be arranged on the free end side.

  The clutch inner ring 21 of the one-way clutch 13 of the present invention only needs to have different outer diameters at both ends in the axial direction of the ramp surface 21a, and is tapered over the entire axial length of the clutch inner ring 21 as in this embodiment. Alternatively, as shown in FIG. 3, by forming only a part of the lamp surface 21a, that is, only the small-diameter side end portion 21b side in a tapered shape, the outer diameters at both end portions in the axial direction are formed. May be different.

  In the present embodiment, the clutch outer ring 20 of the one-way clutch 13 is provided separately from the pulley 12, but may be formed integrally with the pulley 12.

  In addition, the one-way clutch of the present invention only needs to transmit a rotational force between the sleeve and the pulley, and the pulley tends to rotate relative to the sleeve in a predetermined direction as in the present embodiment. In this case, the clutch may be a one-way clutch that transmits rotational force, the outer peripheral surface of the inner ring of the clutch is a cylindrical surface, and the inner peripheral surface of the outer ring of the clutch is a cam surface having a plurality of ramp surfaces. A one-way clutch that transmits rotational force may be used only when it tends to rotate relatively in a predetermined direction.

  In this case, the cylindrical surface, which is the fitting portion of the clutch inner ring, may have different outer diameters at both ends in the axial direction, and the small-diameter side end portion with a smaller outer diameter is the axial direction of the belt groove from the axial center of the roller. It is arranged on the center side. Alternatively, the ramp surface of the clutch outer ring may have a different diameter at both axial ends so that the axial clearance in the wedge space is larger on the axial center side of the belt groove than the axial center of the roller.

  The pair of support bearings of the present invention may be of a type other than the deep groove ball bearing, or may be a combination of a roller bearing or a ball bearing. Further, the inner ring or the outer ring of the support bearing may be formed integrally 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.

  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.

(A) is a longitudinal cross-sectional view of the one-way clutch built-in type pulley apparatus which concerns on one Embodiment of this invention, (b) shows the cross-sectional shape of a clutch inner ring | wheel, (c) is the contact on a roller bus-line. It is a figure which shows surface pressure distribution. (A) is a longitudinal cross-sectional view of the one-way clutch built-in type pulley apparatus of this invention which shows the pulley from which the position of a belt groove differs from FIG. 1, (b) shows the cross-sectional shape of a clutch inner ring | wheel. It is sectional drawing which shows the modification of the clutch inner ring | wheel of this embodiment. (a) is a longitudinal cross-sectional view of the conventional pulley apparatus, (b) is a figure which shows contact surface pressure distribution on a roller bus-line.

Explanation of symbols

10 One-way clutch built-in pulley device 11 Sleeve 12 Pulley 13 One-way clutch 14a, 14b Support bearing 21 Clutch inner ring 21a Ramp surface (fitting portion)

Claims (3)

Sleeve,
A pulley having a belt groove arranged around the sleeve and concentrically with the sleeve, around which an endless belt can be wound;
A clutch inner ring that is disposed between the sleeve and the pulley, and is provided separately from the sleeve and fitted on the sleeve; and a clutch outer ring provided integrally with the pulley or separately. A plurality of rollers arranged in a wedge space formed between the clutch inner ring and the clutch outer ring, a clutch holder for holding the rollers at predetermined intervals in the circumferential direction, and supported by the clutch holder A one-way clutch comprising: an elastic member that biases the roller in a narrow direction of the wedge space;
A one-way clutch built-in pulley device comprising:
The axial center of the roller and the axial center of the belt groove of the pulley are offset from each other,
The engaging portion of the clutch inner ring to which the roller is in rolling contact has different outer diameters at both axial end portions, and the small-diameter side end portion on the smaller outer diameter side is closer to the belt groove than the axial center of the roller. A pulley apparatus with a built-in one-way clutch, characterized in that it is arranged on the center side in the axial direction.   The one-way clutch built-in type pulley apparatus according to claim 1, further comprising a pair of support bearings disposed between the sleeve and the pulley and on both axial sides of the one-way clutch. Sleeve,
A pulley having a belt groove arranged around the sleeve and concentrically with the sleeve, around which an endless belt can be wound;
A plurality of rollers disposed between the sleeve and the pulley, and a clutch inner ring, a clutch outer ring, and a plurality of rollers disposed in a wedge space formed between the clutch inner ring and the clutch outer ring; A one-way clutch comprising: a clutch holder that holds the roller in the circumferential direction at a predetermined interval; and an elastic member that is supported by the clutch holder and biases the roller in a narrow direction of the wedge space;
A one-way clutch built-in pulley device comprising:
The axial center of the roller and the axial center of the belt groove of the pulley are offset from each other,
Either one of the outer peripheral surface of the clutch inner ring and the inner peripheral surface of the clutch outer ring has a ramp surface formed at a predetermined interval in the circumferential direction,
The ramp surface is formed with different diameters at both axial ends so that an axial gap in the wedge space is larger on an axial center side of the belt groove than an axial center of the roller. One-way clutch built-in pulley device.

Images