JP2007198503A - 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, in which processing cost of a sleeve can be reduced, and torque transmission between the sleeve and a vehicle auxiliary device can be ensured even when large torque acts. <P>SOLUTION: In this pulley device with built-in one-way clutch 10, the inner circumferential surface 11a of the sleeve 11 can be fitted with a rotating shaft, and the sleeve 11 can be fixed to the rotating shaft by a connecting member. At least a part of the inner circumferential surface of the sleeve 11 has a detent part 11a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pulley device with a built-in one-way clutch, and in particular, applies power to an input shaft of an auxiliary device such as an alternator driven by power of an engine crankshaft, and conversely, engine crankshaft. The present invention relates to a pulley device with a built-in one-way clutch used for an output shaft of a starter motor.

  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 is known (see, for example, Patent Document 1) so that relative rotation between a pulley and a rotating shaft is free.

  For example, as shown in FIG. 9, a pulley apparatus 100 with a built-in one-way clutch incorporated in an automobile accessory includes a pulley 101 over which a drive belt from a drive pulley fixed to a crankshaft of an engine is stretched, and an automobile accessory. A one-way clutch 103 and a pair of support bearings 104 are disposed between the pulley 101 and the sleeve 102.

  When the rotational angular velocity of the pulley 101 is higher than the rotational angular velocity of the rotating shaft of the automobile accessory, the pulley 101 and the sleeve 102 become relatively unrotatable (locked state) due to the wedge action of the roller of the one-way clutch 103. The rotational force of the engine is transmitted to the rotating shaft of the automobile accessory. On the other hand, when the rotational angular speed of the pulley 101 is slower than the rotational angular speed of the rotating shaft of the automobile accessory, such as a speed fluctuation or a minute angular speed fluctuation, the pulley 101 and the sleeve 102 can freely rotate (overrun state). Therefore, even when the rotational angular velocity of the crankshaft fluctuates, the endless belt and the pulley 101 are prevented from rubbing due to the action of the one-way clutch 103, and the endless belt is prevented from being shortened due to the generation of abnormal noise called wear and wear. In addition, it is possible to prevent the power transmission efficiency to the automobile auxiliary machine from being lowered.

Further, in order to fix the rotating shaft of the automobile accessory to the inner peripheral surface of the sleeve 102, an inlay fitting portion 102a for fitting the rotating shaft without rattling, and a screw shaft for fixing the rotating shaft. A female screw portion 102b, and a tool hole portion 102c having a hexagonal cross-sectional shape capable of engaging with a tool for fixing the sleeve 102 and the rotation shaft are formed.
Japanese Patent Laid-Open No. 11-270658

  By the way, as shown in FIG. 9, the inner peripheral surface of the sleeve 102 is formed with the spigot fitting portion 102 a, the female screw portion 102 b, and the tool hook portion 102 c, and therefore, processing steps for forming each portion are performed. Each of them is necessary, and there is a problem that processing costs increase.

  Further, the sleeve 102 and the rotating shaft are fixed to each other by screwing the female thread portion 102b of the sleeve 102 and the male thread portion of the rotating shaft, and torque transmission from the sleeve 102 to the automobile accessory is performed by the sleeve 102 and the automotive shaft. Although it is transmitted by the frictional force between the rotating shafts of the auxiliary machines, slipping may occur between the sleeve 102 and the rotating shaft when a large torque is applied, and more reliable torque transmission is desired.

  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 processing cost of the sleeve and to ensure torque transmission between the sleeve and the automobile accessory even when a large torque is applied. An 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) A sleeve that can be fixed to the rotating shaft of an automobile accessory;
A pulley arranged concentrically with the sleeve around the sleeve;
A one-way clutch disposed between the outer peripheral surface of the sleeve and the inner peripheral surface of the pulley;
A one-way clutch built-in pulley device comprising:
The inner peripheral surface of the sleeve can be fitted with a rotating shaft, the sleeve and the rotating shaft can be fixed by a coupling member, and
A pulley apparatus with a built-in one-way clutch, wherein at least a part of an inner peripheral surface of a sleeve has a rotation preventing portion.

  According to the present invention, since at least a part of the inner peripheral surface of the sleeve has a non-rotating shape, in addition to the frictional force between the sleeve and the rotating shaft of the automobile accessory, torque is also generated by the detent portion of the inner peripheral surface of the sleeve. Transmission is possible, and even when a large torque is applied, torque transmission between the sleeve and the automobile accessory can be reliably performed. Further, since the sleeve and the rotating shaft can be fixed by the coupling member, it is not necessary to process the female thread portion on the inner peripheral surface of the sleeve, and the processing cost can be reduced.

  Hereinafter, a pulley apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a longitudinal sectional view for explaining a pulley apparatus with a built-in one-way clutch for automobile auxiliary equipment according to a first embodiment. As shown in FIG. 1, a pulley apparatus 10 with a built-in one-way clutch according to the present embodiment is for driving an automobile auxiliary machine A (see FIG. 2) such as an alternator, and has a rotary shaft 30 fitted therein. A sleeve 11 is provided. 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 14 which are ball bearings, such as a deep groove ball bearing, are arrange | positioned at the 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 enables the relative rotation between the sleeve 11 and the pulley 12 while supporting a radial load applied to the pulley 12.

  Each support bearing 14 includes an inner ring 15 fitted on the outer circumferential surface of the sleeve 11, an outer ring 16 fitted on the inner circumferential surface of the pulley 12, and a roller disposed between both raceway surfaces of the inner ring 15 and the outer ring 16. It has a plurality of balls 17 that are moving bodies, 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. Yes.

  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 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 that individually accommodate the rollers 22 and a spring 24 that is an elastic member that elastically presses the rollers 22 in the locking direction. .

  In the pulley device 10 with a built-in one-way clutch configured as described above, when the rotational angular velocity of the pulley 12 is faster than the rotational angular velocity of the rotating shaft 30 of the automobile auxiliary machine A, for example, the roller 22 of the one-way clutch 13 is The wedge action engages between the ramp surface 21a of the clutch inner ring 21 and the cylindrical surface 20a of the clutch outer ring 20, so that the pulley 12 and the sleeve 11 cannot be rotated relative to each other (locked), and the rotational force of the engine is compensated for by the automobile. It is transmitted to the rotary shaft 30 of the machine A. On the other hand, when the rotational angular velocity of the pulley 12 is slower than the rotational angular velocity of the automobile accessory A, the roller 22 is released from engagement and the pulley 12 and the sleeve 11 can be rotated relative to each other (overrun state).

  Further, in the pulley device 10 described above, the rotation preventing portion 11a into which the rotating shaft 30 of the automobile auxiliary machine A is inserted is formed on the inner peripheral surface of the sleeve 11 in the axial direction. As shown in FIG. 1B, the rotation preventing portion 11a is formed in a two-sided width shape having an arcuate surface facing an opposing parallel surface.

  On the other hand, as shown in FIG. 2, the rotating shaft 30 of the automobile accessory A fixed to the sleeve 11 has the same shape as the rotation preventing portion 11 a of the sleeve 11 at its end, and the axial direction of the sleeve 11. The anti-rotation fitting portion 30a has a length substantially equal to the length, and a male screw portion 30b formed at the tip of the fitting portion 30a.

  Accordingly, when the pulley device 10 with a built-in one-way clutch having the sleeve 11 formed in this manner is fixed to the rotating shaft 30 of the automobile auxiliary machine A, the fitting portion 30a formed on the rotating shaft 30 is prevented from rotating. The nut 31 is inserted into the portion 11a, and the nut 31 is screwed into the male screw portion 30b until the nut 31 as a coupling member comes into contact with the end surface of the sleeve 11.

  Therefore, according to the pulley device 10 with a built-in one-way clutch of the present embodiment, the inner peripheral surface of the sleeve 11 has the anti-rotation portion 11a, so that in addition to the frictional force between the sleeve 11 and the rotating shaft 30 of the auxiliary vehicle A, Thus, torque can also be transmitted by the anti-rotation portion 11a on the inner peripheral surface of the sleeve 11, and torque transmission between the sleeve 11 and the vehicle accessory A can be performed reliably even when a large torque is applied. Further, since the sleeve 11 and the rotary shaft 30 can be fixed by the nut 31, it is not necessary to process a conventional female thread portion on the inner peripheral surface of the sleeve 11, and the inner peripheral surface of the sleeve 11 can be easily processed. Processing cost can be reduced.

  In addition, in this embodiment, although the rotation prevention part of the internal peripheral surface of a sleeve is made into the two-plane width shape, it is not limited to this. For example, as in the pulley device 40 with a built-in one-way clutch shown in FIG. 3, the anti-rotation portion 41a of the sleeve 41 may be square, and the one-way in the second variant shown in FIG. As in the clutch-equipped pulley device 50, the anti-rotation portion 51a of the sleeve 51 may be hexagonal.

(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 in detail. Note that this embodiment is different from the first embodiment only in the shape of the sleeve and the shape of the rotating shaft of the automobile auxiliary equipment corresponding thereto, and therefore, the other components are denoted by the same reference numerals and the description thereof is omitted or simplified. Turn into.

  In the pulley device 60 with a built-in one-way clutch according to the present embodiment, the inner peripheral surface of the sleeve 61 is a circular inlay portion 61a having an inner diameter φB on the automobile accessory side and an arcuate surface facing the anti-vehicle accessory side. And a rotation stopper 61b having a two-sided width shape with a diameter of φA.

  On the other hand, the rotating shaft 62 of the automobile auxiliary machine has a columnar spigot fitting portion 62a having an outer diameter φb that fits with the spigot portion 61a of the sleeve 61 at an end portion thereof, and a rotation stopper portion 61b in front of the cylindrical portion 62a. The anti-rotation fitting part 62b which has the diameter of the opposing circular arc surface which has the same shape two-plane width | variety is (phi) a, and the external thread part 62c formed ahead of the rotation prevention fitting part 62b.

  Here, the fitting clearance between the spigot portion 61a and the spigot fitting portion 62a is a fitting clearance on the anti-automobile accessory side, that is, the fitting between the anti-rotation portion 61b and the anti-rotation fitting portion 62b. It is set to be larger than the clearance. Therefore, the relationship of the clearance between the sleeve 61 and the rotating shaft 62 is set to (φB−φb)> (φA−φa). Thereby, when attaching the sleeve 61 to the rotating shaft 62, the spigot portion 61a serves as a guide, and the rotating shaft 62 is easily fitted in the rotation preventing portion 61b.

  At this time, the relationship between the axial length D of the spigot portion 61a and the axial length C of the rotation preventing portion 61b is set to C <D. When C> D, as shown in FIG. 6, the axial length C of the anti-rotation fitting portion 62b corresponding to the anti-rotation portion 61b is longer than the axial length D of the inlay portion 61a. This is because the front end of the anti-rotation fitting portion 62b hits the step between the inlay portion 61a and the anti-rotation portion 61b before the portion 61a and the inlay fitting portion 62a are fitted together, and the inlay portion 61a does not serve as a guide. .

  As in the first embodiment, the sleeve 61 and the rotary shaft 62 are fastened to each other by screwing a nut into a male screw portion 62c of the rotary shaft 62 that protrudes from the sleeve 61 to the side opposite to the auxiliary machine.

Therefore, according to the pulley device 60 with a built-in one-way clutch according to the present embodiment, the inner peripheral surface of the sleeve 61 is provided with the inlay portion 61a and the rotation preventing portion 61b, and the clearance for fitting with the rotating shaft of the automobile accessory is as follows. Since the fitting clearance at the spigot portion 61a is set to be larger than the fitting clearance at the non-rotating portion 61b, the spigot portion 61a serves as a guide when the sleeve 61 is attached to the vehicle auxiliary machine. Workability can be improved.
Other configurations and operations are the same as those in the first embodiment.

(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 in detail. Note that this embodiment is different from the first embodiment only in the shape of the sleeve and the shape of the rotating shaft of the automobile auxiliary equipment corresponding thereto, and therefore, the other components are denoted by the same reference numerals and the description thereof is omitted or simplified. Turn into.

  In the pulley device 70 with a built-in one-way clutch according to the present embodiment, the inner peripheral surface of the sleeve 71 includes a rotation preventing portion 71a on the side of the automobile accessory having a two-sided width shape and a counterbore portion 71b on the side opposite to the vehicle auxiliary machine. Have.

  As a result, the rotating shaft 30 ′ of the automobile auxiliary machine A has the anti-rotation fitting portion 30a ′ having a length corresponding to the axial length of the anti-rotation portion 71a. The male screw portion 30b ′ at the tip is positioned in the counterbore portion 71b, and the nut 31 ′ is fastened to the male screw portion 30b ′ in the counterbore portion 71b.

Therefore, according to the pulley device 70 with a built-in one-way clutch of the present embodiment, the inner peripheral surface of the sleeve 71 has the counterbore portion 71b on the anti-automobile accessory side, so the nut 31 'for fastening the rotary shaft 30' is provided. It is arrange | positioned in the spot part 71b and the pulley apparatus 70 can be reduced in size.
Other configurations and operations are the same as those in the first embodiment.

  Moreover, the one-way clutch built-in type pulley apparatus 80 shown in FIG. 8 is combined with 2nd Embodiment as a modification of this embodiment. That is, the inner peripheral surface of the sleeve 81 includes a circular inlay portion 81a on the side of the automobile accessory, a rotation preventing portion 81b having a two-sided width shape, and a counterbore portion 81c on the side of the anti-automobile accessory. The rotating shaft 62 ′ of the auxiliary vehicle A includes an inlay fitting portion 62a ′ having a length corresponding to each axial dimension, an anti-rotation fitting portion 62b ′, and a male screw portion 62c ′. The shaft 62 ′ is fastened to the sleeve 81 by a nut 31 ′ to a male thread portion 62c ′ positioned in the counterbore portion 81c.

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

  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. The clutch inner ring may be a cylindrical surface, and the clutch outer ring may be a cam surface having a plurality of ramp surfaces, and the sleeve may be fixed to the pulley. A one-way clutch that transmits rotational force may be used only when it tends to rotate relative to the direction.

  The one-way clutch of the present invention may be a roller clutch as in this embodiment, or may be a cam clutch or a sprag clutch. The clutch outer ring or clutch inner ring of the one-way clutch may be separate from the pulley or sleeve as in this embodiment, and is integrated with the pulley or sleeve, that is, depending on the inner peripheral surface of the pulley or the outer peripheral surface of the sleeve. It may be configured.

  Further, 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 integrated with the pulley or the sleeve, that is, the inner peripheral surface of the pulley or the outer peripheral surface of the sleeve.

(A) is sectional drawing of the pulley apparatus with a built-in one-way clutch which concerns on 1st Embodiment of this invention, (b) is a side view of a sleeve. It is sectional drawing which shows the state which attached the pulley apparatus of FIG. 1 to the alternator. (A) is a longitudinal cross-sectional view of the one-way clutch built-in type pulley apparatus which concerns on the 1st modification of 1st Embodiment of this invention, (b) is a side view of a sleeve. (A) is a longitudinal cross-sectional view of the one-way clutch built-in type pulley apparatus which concerns on the 2nd modification of 1st Embodiment of this invention, (b) is a side view of a sleeve. (A) is sectional drawing of the pulley apparatus and alternator with a one-way clutch which concern on 2nd Embodiment of this invention, (b) is a left view of a sleeve, (c) is a right view of a sleeve. is there. It is a fragmentary sectional view for demonstrating the subject in case the rotation prevention part of a sleeve is longer than an inlay part. It is sectional drawing which shows the state which assembled | attached the alternator with the one-way clutch built-in type pulley apparatus which concerns on 3rd Embodiment of this invention. It is sectional drawing which shows the state which assembled | attached the alternator with the one-way clutch built-in type pulley apparatus which concerns on the modification of 3rd Embodiment of this invention. It is sectional drawing of the conventional one-way clutch built-in type pulley apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 One-way clutch built-in pulley apparatus 11 Sleeve 11a Non-rotating part 12 Pulley 12a Pulley groove 13 One-way clutch 14 Support bearing 30 Rotating shaft 30a Non-rotating fitting part 30b Male thread part 31 Nut A Alternator (automobile auxiliary machine)

Claims (1)

A sleeve that can be fixed to the rotating shaft of an automobile accessory,
A pulley disposed around the sleeve and concentrically with the sleeve;
A one-way clutch disposed between an outer peripheral surface of the sleeve and an inner peripheral surface of the pulley;
A one-way clutch built-in pulley device comprising:
The inner peripheral surface of the sleeve can be fitted with the rotating shaft, the sleeve and the rotating shaft can be fixed by a coupling member, and
A pulley apparatus with a built-in one-way clutch, wherein at least a part of an inner peripheral surface of the sleeve has a rotation preventing portion.

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