JP2010121763A - One-way clutch and pulley apparatus incorporating such one-way clutch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a one-way clutch capable of improving engaging performance and a pulley apparatus incorporating such a one-way clutch. <P>SOLUTION: A spring 19 of the one-way clutch comprises a leaf spring, and has bent parts 26 and contact parts 28 at both sides of a base part 25 being an intermediate part and in contact with a roller. The spring 19 presses the roller in a locking direction by each of the contact parts 28. The base part 25 includes a pair of locking parts 30 at its both ends, and a grease scraping part 31 projecting between the locking parts 30 and protruding radially outward than the locking parts 30 for scraping grease adhered on the inner peripheral face of an outer ring in an overrun state in which an inner ring and the outer ring relatively rotate. The amount of grease accumulated between the roller and a back face of the spring 19 is reduced, resistance preventing movement of the roller during locking is reduced, and engaging performance of the clutch is improved. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a one-way clutch and a pulley device with a built-in one-way clutch. More specifically, the present invention relates to an input shaft of an auxiliary machine such as an alternator driven by the power of an engine crankshaft, or power to an engine crankshaft. The present invention relates to a one-way clutch and a pulley device with a built-in one-way clutch that are used by being fixed to an output shaft of a starter motor.

  2. Description of the Related Art Conventionally, various auxiliary machines are driven using a drive engine of an automobile as a drive source. For example, when driving an alternator that generates electric power necessary for an automobile, a clutch built-in type pulley apparatus incorporating a one-way clutch is used. It is known to use (see, for example, Patent Document 1).

  For example, as shown in FIG. 9, the one-way clutch 100 includes a roller 103 that has a cam surface 101 a on the inner ring 101 and is disposed in the wedge space so as to form a wedge space between the inner ring 101 and the outer ring 102. The lock state and the overrun state are repeated by engaging and disengaging. Each roller 103 arranged in the wedge space is accommodated in a plurality of pockets formed in the cage 104, and in a direction in which a wedge action is exerted by a spring 105 locked to the cage 104, that is, in a locking direction. It is pressed elastically.

  The spring 105 shown in FIG. 10 includes a base portion 106, a pair of pressing portions 107 that are bent with respect to the base portion 106 on both sides of the base portion 106, and a roller 103 that is bent with respect to the pressing portion 107 at the distal end portion of the pressing portion 107. A pair of abutting portions 108 in contact with each other.

JP 2007-198582 A

  Incidentally, as shown in FIG. 9, in the overrun state of the one-way clutch 100, the grease adhering to the inner peripheral surface of the outer ring 102 first strikes the roller 103 and is scraped off (in FIG. 9, the arrow C See)) and stays between the roller 103 and the back of the spring 100.

  This staying location is the direction of movement of the roller 103 when the one-way clutch 100 tries to engage next, so that the grease prevents the movement of the roller 103. Especially at low temperatures, the consistency of grease decreases and its resistance increases. For this reason, it is desired to improve the engagement performance of the one-way clutch.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a one-way clutch and a one-way clutch built-in pulley device that can improve engagement performance.

The above object of the present invention can be achieved by the following constitution.
(1) an inner member;
An outer member arranged to be rotatable relative to the inner member;
A plurality of engagement elements disposed between an outer peripheral surface of the inner member and an inner peripheral surface of the outer member;
A holder that rotates with one of the inner member and the outer member to hold the plurality of engagement elements;
A spring that is locked to the retainer and presses the plurality of engagement elements in a direction of engaging;
A one-way clutch comprising:
The spring includes a grease scraping portion that scrapes off grease adhered to the outer peripheral surface of the inner member or the inner peripheral surface of the outer member when the inner member and the outer member rotate relative to each other. And one-way clutch.
(2) The spring is formed at a middle portion in the longitudinal direction, and is formed at a base portion that is locked to the retainer, and at both ends in the longitudinal direction, and a pair of presses that press the plurality of engagement elements in a direction to be engaged. A leaf spring having a portion,
The one-way clutch according to (1), wherein the grease scraping portion is provided on the base portion.
(3) The base includes a locking portion that is locked to the cage at both ends thereof.
The one-way clutch according to (2), wherein the grease scraping portion protrudes in a radial direction from the locking portion.
(4) a sleeve in which the rotary shaft is fitted;
A pulley disposed concentrically with the sleeve on a radially outer side of the sleeve;
The pulley and the sleeve are provided between the outer peripheral surface of the sleeve and the inner peripheral surface of the pulley, and only when one of the pulley and the sleeve tends to rotate relative to the other in a predetermined direction. A one-way clutch according to any one of (1) to (3), which transmits a rotational force between
Between the outer peripheral surface of the sleeve and the inner peripheral surface of the pulley, it is provided at a position axially separated from the one-way clutch, and supports a radial load applied to the pulley while the pulley and the sleeve A pulley apparatus with a built-in one-way clutch, comprising: a support bearing capable of relative rotation.

  According to the one-way clutch and the pulley device with a built-in one-way clutch of the present invention, the spring has an outer peripheral surface of the inner member or an inner periphery of the outer member at the time of overrun in which the inner member and the outer member rotate relative to each other. Since it has a grease scraping part that scrapes off the grease adhering to the surface, it is possible to reduce the amount of grease that stays between the engagement element and the spring at the time of overrun, and to prevent the movement of the engagement element during engagement The clutch engagement performance can be improved.

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

(First embodiment)
First, with reference to FIGS. 1-4, 1st Embodiment of this invention is described in detail.
As shown in FIG. 1, the pulley apparatus 10 with a built-in clutch includes a sleeve 11 into which a rotating shaft (not shown) of an auxiliary machine such as an alternator is screwed, and a sleeve 11 radially outside the sleeve 11. And a pulley 12 having a belt groove 12a formed on the outer peripheral surface thereof. A drive belt (not shown) suspended from a drive pulley (not shown) fixed to the crankshaft of the engine is stretched over the belt groove 12a.

  In addition, a one-way clutch 13 is disposed between the outer peripheral surface of the sleeve 11 in the axial intermediate portion and the inner peripheral surface of the pulley 12 in the axial intermediate portion. A pair of rolling bearings 14 is disposed between the outer peripheral surface at both axial ends of the sleeve 11 and the inner peripheral surface at both axial ends of the pulley 12, which are spaced apart. The one-way clutch 13 transmits a rotational force between the pulley 12 and the sleeve 11 only when the pulley 12 tends to rotate relative to the sleeve 11 in a predetermined direction. As the rolling bearing 14, a deep groove ball bearing or the like is used, and the sleeve 11 and the pulley 12 can be relatively rotated while supporting a radial load applied to the pulley 12.

  The one-way clutch 13 is an inner ring 15 that is an inner member that is press-fitted and fixed to the outer peripheral surface of the sleeve 11, and an outer member that is press-fitted and fixed to the inner peripheral surface of the pulley 12 and is disposed so as to be rotatable relative to the inner ring 15. A certain outer ring 16 and a plurality of rollers 17 that are engaging elements disposed between the outer peripheral surface of the inner ring 15 and the inner peripheral surface of the outer ring 16 are provided. The outer peripheral surface of the inner ring 15 forms a cam surface in which a plurality of ramp portions 15a are formed at predetermined intervals in the circumferential direction, and the roller 17 is formed from the cylindrical surface 16a of the outer ring 16 and each ramp portion 15a. It is rotatably held in the wedge space.

  The one-way clutch 13 includes a cage 18 having a plurality of pockets for individually accommodating the rollers 17 and a spring 19 that elastically presses the rollers 17 in a direction in which the wedge space is engaged. Yes.

  As shown in FIG. 2, the retainer 18 includes a pair of annular portions 20 and a plurality of column portions 21 that connect the pair of annular portions 20.

  Convex portions 24 are formed on the inner peripheral surfaces of the pair of annular portions 20 so as to engage with both end portions in the axial direction of the ramp portion 15 a, and the cage 18 rotates together with the inner ring 15 and the sleeve 11. In addition, a pair of end-side spring holding portions 22 are radially outward from the outer peripheral surface side of each column portion 21 at a portion aligned with each column portion 21 in the circumferential direction on the inner side surface of the pair of annular portions 20. It is formed in a state of projecting. On the other hand, the center side spring holding part 23 is formed in the axial direction center part of each pillar part 21 in the state which protrudes from the outer peripheral surface side of each pillar part 21 to radial direction outward. The spring 19 is sandwiched in the circumferential direction between one circumferential side surface of the end side spring holding portion 22 and the other circumferential side surface of the center side spring holding portion 23. Further, an extending portion 22a extending in the circumferential direction is formed on the outer diameter side of the end portion side spring holding portion 22 to prevent the spring 19 from coming out radially outward.

  As shown in FIGS. 2 and 3, the spring 19 is formed of a leaf spring, and forms a pressing portion 27 by bending both sides of a base portion 25 that is an intermediate portion in the longitudinal direction as a bending portion 26 at a predetermined position. Thus, the tip of the pressing portion 27 is further bent to form a contact portion 28 with which the roller 17 contacts. As a result, the spring 19 comes into contact with each roller 17 at the contact portion 28 and presses each roller 17 toward the locking direction, that is, toward the shallow side of the groove of the ramp portion 15a.

  In addition, the base portion 25 of the spring 10 has a pair of locking portions 30 that are locked to the extension portions 22a of the end-side spring holding portions 22 at both ends thereof, and the locking portion 30 between the pair of locking portions 30. And a grease scraping portion 31 that protrudes radially outward from the portion 30 and scrapes off the grease adhering to the inner peripheral surface of the outer ring 16 in an overrun state.

  The pulley device 10 with a built-in one-way clutch configured in this way has a tendency that the outer ring 16 rotates relative to the inner ring 15 in a predetermined direction when the rotation angular speed of the pulley 12 is faster than the rotation angular speed of the rotating shaft. In this case, the roller 17 is engaged with the wedge space between the cylindrical surface of the outer ring 16 and the ramp portion 15a of the inner ring 15 by the wedge action, and the rollers 17 are interposed between the outer ring 16 and the inner ring 15 via the rollers 17. Rotational force can be transmitted freely. As a result, the pulley 12 and the sleeve 11 cannot be rotated relative to each other (in a locked state), and the rotational force of the engine is transmitted to the rotating shaft. On the other hand, when the rotational angular velocity of the pulley 12 is slower than the rotational angular velocity of the rotating shaft, the engagement of the roller 17 is released, and the pulley 12 and the sleeve 11 can be freely rotated (overrun state).

  Here, in the overrun state, relative rotation is also performed between the inner ring 15 and the outer ring 16, but the spring 19 that rotates together with the inner ring 15 via the retainer 18 is rotated by the grease scraping portion 31. The grease adhering to the surface is scraped off (see arrow A in FIG. 4). That is, when overrun, the grease adhering to the inner peripheral surface of the outer ring 16 is prevented from first hitting the roller 17, and the amount of grease staying between the roller 17 and the back surface of the spring 19 is reduced. Can do. Therefore, the resistance that hinders the movement of the roller 17 at the time of locking is reduced, and the engagement performance of the clutch can be improved.

As a modification of the spring 19 of the present embodiment, grease scraping portions 31 may be provided on both radial sides of the base portion 25 as shown in FIG. In this case, the spring 19 has a symmetrical shape, and the spring 19 can be inserted into the retainer 18 without taking the directionality into consideration, and the assemblability can be improved.
Further, the grease scraper 31 can extend from the outer peripheral surface of the cage 18 to the radially outer side as long as it does not interfere with the inner peripheral surface of the outer ring 16.

(Second Embodiment)
Next, a second embodiment of the present invention will be described in detail with reference to FIGS. The present embodiment is different from the first embodiment only in the shape of the spring of the one-way clutch, and other parts are the same as those in the first embodiment, and the description is omitted or simplified.

  As shown in FIGS. 6 to 8, in the spring 19 a of this embodiment, after the grease scraping portion 40 formed on the base portion 25 protrudes radially outward from the locking portion 30, the front of the spring 19 a ( It is bent at a substantially right angle toward the contact portion side). A pair of grease guide portions 41 bent toward the front of the spring 19a, that is, toward the roller 17 is provided on the radially outer side of the contact portion 28 of the spring 19a. These grease guide portions 41 are formed in a plate shape with such a length that they do not contact the roller 17 and do not contact the base portion 25 when deformed by the roller 17. Further, since the radially outer surface of the pressing portion 27 is tapered so as to gradually become narrower toward the contact portion 28, the grease guide portion 41 continuing from the contact portion 28 has a grease scraper. It arrange | positions so that it can move to the parallel inner side in the radial direction, without interfering with the taking part 40.

Therefore, as shown in FIG. 8 (a), the grease scraper 40 bent forward of the spring 19a forms a grease reservoir G with the base 25, so that the grease is diffused by centrifugal force. Can be suppressed. As shown in FIG. 8B, when the roller 17 comes into contact with the contact portion 28 of the spring 19a and the spring 19a is bent, the grease guide portion 41 approaches the grease reservoir G. Accordingly, the grease staying in the grease reservoir G can be supplied to the roller 17 via the grease guide portion 41 (see arrow B in FIG. 8B), and lubrication at the contact surface of the roller 17 A state can be kept favorable and durability can be improved.
Other configurations and operations are the same as those in the first embodiment.

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

  In the present embodiment, the inner peripheral surface of the outer ring is a cylindrical surface and the outer peripheral surface of the inner ring is a cam surface, but the inner peripheral surface of the outer ring may be a cam surface and the outer peripheral surface of the inner ring may be a cylindrical surface. At this time, the convex portion of the cage is attached to the cam surface of the outer ring, and the cage and the spring rotate together with the outer ring. In this case, it is possible to scrape off the grease adhering to the outer circumferential surface of the inner ring by providing the grease scraping portion at the base portion so as to protrude radially inward.

In this embodiment, the inner ring of the one-way clutch is press-fitted into the sleeve and the outer ring of the one-way clutch is press-fitted into the pulley. However, the inner ring may be formed integrally with the sleeve, or the outer ring may be formed integrally with the pulley. Therefore, the sleeve may be an inner member and the pulley may be an outer member.
In this embodiment, the pulley device with a built-in one-way clutch is mounted between the rotating shaft of the alternator and the driven pulley, but may be mounted between the pulley of the starter and the rotating shaft. In this case, the sleeve is attached to the pulley. On the other hand, the rotational force can be transmitted between the sleeve and the pulley only when it tends to rotate relative to the predetermined direction.

  Further, in the present embodiment, the spring holding method by the cage according to the present invention is held by the end side spring holding portion and the center side spring holding portion of the column portion, but is not limited thereto.

It is a longitudinal cross-sectional view of the pulley apparatus with a built-in clutch which is 1st Embodiment of this invention. It is a perspective view which shows the holder | retainer and spring of the one-way clutch of FIG. It is a perspective view which shows the spring of the one-way clutch of FIG. It is sectional drawing of the one-way clutch of FIG. It is a perspective view which shows the spring which concerns on the modification of the one-way clutch of 1st Embodiment. It is a perspective view which shows the spring of 2nd Embodiment. It is a top view which shows the spring and roller of the one-way clutch of FIG. It is sectional drawing along the VIII-VIII line of FIG. 8, (a) shows the open state of a spring, (b) shows the contracted state of a spring. It is sectional drawing of the conventional one-way clutch. It is a perspective view of the spring of the conventional one-way clutch.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pulley apparatus with built-in clutch 11 Sleeve 12 Pulley 13 One-way clutch 14 Support bearing 15 Inner ring 15a Lamp part 16 Outer ring 17 Roller 18 Cage 19 Spring 25 Base 30 Locking part 31, 40 Grease scraping part

Claims (4)

An inner member;
An outer member arranged to be rotatable relative to the inner member;
A plurality of engagement elements disposed between an outer peripheral surface of the inner member and an inner peripheral surface of the outer member;
A holder that rotates with one of the inner member and the outer member to hold the plurality of engagement elements;
A spring that is locked to the retainer and presses the plurality of engagement elements in a direction of engaging;
A one-way clutch comprising:
The spring includes a grease scraping portion that scrapes off grease adhered to the outer peripheral surface of the inner member or the inner peripheral surface of the outer member when the inner member and the outer member rotate relative to each other. And one-way clutch. The spring is formed at a middle portion in the longitudinal direction and is engaged with the retainer, a pair of pressing portions that are formed at both ends in the longitudinal direction and press the plurality of engagement elements in a direction to be engaged, A leaf spring having
The one-way clutch according to claim 1, wherein the grease scraping portion is provided on the base portion. The base includes a locking portion that is locked to the cage at both ends thereof,
The one-way clutch according to claim 2, wherein the grease scraping part protrudes in a radial direction from the locking part. A sleeve in which the rotation shaft is fitted;
A pulley disposed concentrically with the sleeve on a radially outer side of the sleeve;
The pulley and the sleeve are provided between the outer peripheral surface of the sleeve and the inner peripheral surface of the pulley, and only when one of the pulley and the sleeve tends to rotate relative to the other in a predetermined direction. A one-way clutch according to any one of claims 1 to 3, which transmits a rotational force between
Between the outer peripheral surface of the sleeve and the inner peripheral surface of the pulley, it is provided at a position axially separated from the one-way clutch, and supports a radial load applied to the pulley while the pulley and the sleeve A pulley apparatus with a built-in one-way clutch, comprising: a support bearing capable of relative rotation.

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