JP2010060103A - Pulley with built-in one-way clutch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten the axial length of a pulley with a built-in one-way clutch while securing torque capacity. <P>SOLUTION: A pulley 7 and an inner shaft 12 are coaxially disposed. An input side member 14 equipped with cylindrical outer peripheral parts 14a, 14b, and an outside plate part 14c erected from an axially middle part of the outer peripheral parts 14a, 14b toward a radially inner side is press-fitted and fixed to the inner periphery of the pulley 7. An output side member 15 equipped with a cylindrical base part 15b and an inside plate part 15c erected from the base part 15b toward the radially outer side is press-fitted and fixed to the outer periphery of the inner shaft 12. The both plate parts 14c, 15c are provided with engaging faces 14e, 15e that are axially opposed, and the one plate part 15c is provided with an engaging piece 17 and is biased toward the other plate part 14c, and an engaging face 14e of the other plate part 14c is provided with an engaging recessed part 18 to which the engaging piece 17 is inserted. When the pulley 7 and the inner shaft 12 relatively rotate in one direction around the axis, the engaging piece 17 is engaged with the engaging recessed part 18 and connects the pulley 7 and the inner shaft 12, and when the pulley 7 and the inner shaft 12 relatively rotate in the other direction, the connection is released. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pulley with a built-in one-way clutch that is disposed in various power transmission paths such as a power transmission path between an automobile engine and accessories, and that transmits and blocks rotational torque.

  For example, in an auxiliary machine drive device that transmits rotation of a crankshaft of an engine of an automobile or the like to various auxiliary machines via a belt, the auxiliary machine, for example, a hydraulic pump of a power steering apparatus or a compressor of an air conditioner, Alternatively, a one-way clutch is incorporated between a rotating shaft such as an alternator and a pulley provided on the rotating shaft.

  In this type of one-way clutch built-in pulley, when the angular speed of rotation of the crankshaft increases, the rotation shaft and the pulley are coupled to transmit the rotation of the crankshaft to the rotation shaft, and when the angular speed decreases, It functions to block the transmission of rotational torque from the shaft to the rotating shaft and prevent the belt from slipping.

  As an example of a one-way clutch incorporated in a pulley with a built-in one-way clutch, for example, as shown in Patent Document 1, a large number of sprags or the like can be used as an engagement element in a space between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring. Sprag type and roller type one-way clutches incorporating rollers are known.

  For example, as shown in FIG. 4, a ratchet type one-way clutch 1 in which a large number of engagement elements 3 are incorporated in a space between the inner peripheral surface of the outer ring 4 and the outer peripheral surface of the inner ring 2 is also known. .

  In the ratchet type one-way clutch 1, an inclined surface 2a and a stepped portion 2b are periodically formed along the outer periphery of the inner ring 2. In addition, the minimum outer diameter portion Rmin and the maximum outer diameter portion Rmax are adjacent in the circumferential direction with the stepped portion 2b interposed therebetween.

The engagement element 3 is fixed to the outer ring 4 so as to be tiltable around a rotation shaft 6 disposed in the axial direction of the one-way clutch 1, and is engaged with the stepped portion 2 b of the inner ring 2 by an elastic member 5. It is energized in the direction to do.
That is, in the outer peripheral cross section of the inner ring 2, the portion where the engaging element 3 is engaged is the minimum outer diameter portion Rmin, and the outer diameter gradually increases from the position in the circumferential direction to reach the maximum outer diameter portion Rmax. .

  Therefore, for example, when the outer ring 4 is an input side member (drive side) and the inner ring 2 is an output side member (driven side), if the outer ring 4 rotates relative to the inner ring 2 in the direction of arrow a in the figure, When the engaging element 3 is engaged with the stepped portion 2b, a so-called ratchet function is achieved, and the inner and outer rings 2 and 4 are coupled to transmit power.

  When the outer ring 4 rotates relative to the inner ring 2 in the direction opposite to the arrow a, the engagement of the engagement element 3 is released and the inner and outer rings 2 and 4 are idled. The transmission of power is released (see, for example, Patent Document 2).

  Further, as an example of a one-way clutch incorporated in an automatic transmission, which is not incorporated in a pulley with a built-in one-way clutch, as shown in FIG. 5, the ratchet function is exhibited by an engagement piece that can move in the axial direction. There are also things to do.

  In the one-way clutch 20, the input side member 24 and the output side member 25 are provided with engagement surfaces 24e and 25e that are opposed to each other in the axial direction, and the input side member 24 or the output side between the engagement surfaces 24e and 25e. The engaging piece 27 is provided on one side of the member 25, and the engaging recess 24a into which the engaging piece 27 can enter is provided on the other side.

  The engagement piece 27 is provided in an accommodation recess 25a formed in the engagement surface 25e, and is urged toward the engagement surface 24e by an elastic member 26 disposed in a bottom portion 25a ′ of the accommodation recess 25a. Yes.

  When the input side member 24 rotates relative to the output side member 25 in the direction of the arrow b in the figure, the engagement piece 27 enters the engagement recess 24a, thereby coupling the input side member and the output side member. When the input side member 24 rotates relative to the output side member 25 in the direction opposite to the arrow b, the engagement piece 27 is released from the engagement recess 24a, thereby releasing the coupling. (For example, see Patent Document 3).

JP 2001-187931 A Japanese Patent Laid-Open No. 2003-49872 (FIG. 4 on page 5) JP 2000-97255 A

In the one-way clutch described in Patent Documents 1 and 2 described above in which the engagement element is disposed in the space between the inner circumferential surface of the outer ring and the outer circumferential surface of the inner ring, the axial length of the engagement element is ensured to ensure a sufficient torque capacity. There is a problem that the length must be increased.
In particular, when popping due to excessive torque (a phenomenon in which the engagement element is not caught between engagement surfaces and pushed out and the inner and outer rings are not locked) is assumed, the axial length of the engagement element is sufficiently long. There is a need.

  However, since the pulley with a built-in one-way clutch is required to be thin, it is not preferable that the axial length of the engagement element is increased.

  In that respect, since the one-way clutch 20 of Patent Document 3 exhibits the ratchet function with an engagement piece that can move in the axial direction, the axial length of the entire clutch is shortened.

  However, the one-way clutch 20 is a one-way clutch incorporated in an automatic transmission, and the input side member and the output side member are each composed of a thin plate (notch plate and pocket plate). For this reason, the structure cannot be applied as it is to a rotation transmission structure between a pulley and a shaft arranged coaxially, such as a one-way clutch built-in pulley.

  Accordingly, an object of the present invention is to reduce the axial length of a pulley with a built-in one-way clutch while ensuring a torque capacity.

  In order to solve the above-described problems, the present invention provides a plate portion having an engagement surface opposed in the axial direction between a coaxially arranged pulley and an inner shaft, and is engaged with one of the plate portions. A mating piece is provided and the engaging piece is urged from one of the plate portions toward the other plate portion, and the urging force is applied to the engagement surface of the other plate portion by one of the plates. When the engagement piece protrudes from the portion to the other plate portion side, an engagement recess is provided in which the engagement piece can enter, and the pulley and the inner shaft rotate relative to each other in one direction around the axis. The engagement piece engages with the engagement recess to couple the pulley and the inner shaft, and when the pulley and the inner shaft rotate relative to each other in the other direction, the engagement piece It is designed to release from the engagement recess and release the coupling. One of the plate portions is an outer plate portion that rises radially inward from the inner diameter surface of the pulley and rotates integrally with the pulley, and the other rises radially outward from the outer diameter surface of the inner shaft and the inner shaft. A configuration that is an inner plate portion that rotates integrally is adopted.

  Since the pair of plate portions functioning as the input side member and the output side member, that is, the outer plate portion and the inner plate portion are rotated together with the pulley and the inner shaft, respectively, the engagement pieces are movable in the axial direction. Taking advantage of the structure that exhibits the ratchet function, the axial length can be shortened while ensuring the torque capacity of the pulley with a built-in one-way clutch.

  The outer plate portion may be formed integrally with the pulley, or the one formed separately from the pulley may be, for example, press-fitted so that both can rotate integrally. You may fix by well-known methods, such as adhesion | attachment. In addition, the inner plate portion may be formed integrally with the inner shaft, or the one formed separately from the inner shaft, for example, so that both can rotate integrally, You may fix by well-known methods, such as press injection and adhesion | attachment.

  Further, for example, the outer plate portion may be configured to rise radially inward from a cylindrical outer peripheral portion that is press-fitted and fixed to the pulley and rotates integrally with the pulley.

  If the cylindrical outer peripheral part is press-fitted and fixed to the inner diameter part of the pulley, the outer peripheral part is firmly supported over a predetermined axial length with respect to the pulley. For this reason, for example, when the outer plate portion that rises in the radial direction receives an axial force through the engagement piece, the outer plate portion is prevented from being deformed in the axial direction, and a stable engagement force is ensured. Can do.

The outer peripheral portion is preferably press-fitted and fixed so as to be in contact with the axial length of the pulley over as long a range as possible.
Further, if the outer plate portion is configured to rise from the middle in the axial direction of the outer peripheral portion,
The outer plate portion is supported more firmly with respect to the outer peripheral portion.

  On the other hand, with respect to the inner plate portion, for example, the inner plate portion may be configured to rise radially outward from a cylindrical base portion that is press-fitted and fixed to the inner shaft and rotates integrally with the inner shaft.

  If the cylindrical base portion is press-fitted and fixed to the outer diameter portion of the inner shaft, the base portion is firmly supported over a predetermined axial length with respect to the inner shaft. For this reason, for example, when the inner plate portion that rises in the radial direction receives an axial force through the engagement piece, the inner plate portion is prevented from being deformed and moved in the axial direction, thereby ensuring a stable engagement force. can do.

  Note that, like the outer peripheral portion, the base portion is preferably press-fitted and fixed so as to be in contact with the axial direction of the inner shaft as long as possible.

  Further, in each of these configurations, the pulley and the inner shaft are relatively rotatable around the shaft by a first bearing portion provided between the inner diameter surface of the outer peripheral portion and the outer diameter surface of the inner shaft. A supported configuration can be employed. In addition, or alternatively, the pulley and the inner shaft can be relatively rotated around the shaft by a second bearing portion provided between the outer diameter surface of the base and the inner diameter surface of the pulley. A supported configuration can be employed.

  By configuring the outer peripheral portion and the inner shaft to be supported by a bearing, or the base portion and the pulley being supported by a bearing, the outer plate portion rising from the outer peripheral portion or the inner plate rising from the base portion The support rigidity of the part with respect to the pulley and the inner shaft is increased. For this reason, the outer plate part and the inner plate part are firmly supported, and a stable engaging force can be ensured. In addition, as a 1st bearing part and a 2nd bearing part, well-known bearings, such as a ball bearing, are employable, for example.

Moreover, in each of these configurations, one or a plurality of the engagement pieces are provided along the circumferential direction of the plate portion, and the engagement recesses are set at a location greater than the number of the engagement pieces, A configuration in which those engaging recesses are provided along the circumferential direction of the plate portion can be employed.
In this way, when the output side member and the input side member (the pulley and the inner shaft) start to rotate relative to each other, the engagement piece enters the engagement recess, and the outer plate portion and the inner plate portion are connected. This is because the time lag until joining can be reduced.

  The number of these engagement pieces and the number of engagement recesses can be freely set according to the required performance and characteristics of the one-way clutch. For example, the number of engagement pieces and the number of engagement recesses can be determined. It is possible to employ a configuration in which one of the numbers is an odd number and the other is an even number.

  Further, the material of the outer plate portion and the inner plate portion is desirably a C amount of 0.40% or more and subjected to induction hardening.

  According to the present invention, the pair of plate portions that function as a ratchet are rotated together with the pulley and the inner shaft, respectively, so that the torque capacity of the pulley with a built-in one-way clutch is secured and the axial length thereof is shortened. Can do.

  An embodiment of the present invention will be described with reference to FIGS. This embodiment is a pulley unit 10 with a built-in one-way clutch in which a ratchet mechanism is incorporated between a pulley 7 and an inner shaft 12 arranged on the same axis. In this embodiment, the pulley 7 is on the input side and the inner shaft 12 is on the output side.

  As shown in FIG. 1, the input side member 14 and the output side member 15 are arranged between the pulley 7 and the inner shaft 12.

  The input side member 14 is press-fitted and fixed to the inner periphery of the pulley 7 and has cylindrical outer peripheral portions 14 a and 14 b that rotate integrally with the pulley 7, and radially inward from the center in the axial direction of the outer peripheral portions 14 a and 14 b. And an outer plate portion 14c that rises.

  The outer diameter surfaces of the outer peripheral portions 14a and 14b are press-fitted and fixed to the inner diameter surface 7a of the pulley 7 over the entire circumference, and the outer peripheral portions 14a and 14b and the outer plate portion 14c are fixed to the pulley 7 by the press-fitting and fixing. And rotate together.

  The output side member 15 includes a cylindrical base portion 15b that is press-fitted and fixed to the outer periphery of the inner shaft 12 and rotates integrally with the inner shaft 12, and an inner plate portion 15c that rises radially outward from an axial end portion of the base portion 15b. And.

  The inner diameter surface of the base portion 15b is press-fitted and fixed in a state where it is in surface contact with the outer diameter surface 12a of the inner shaft 12 over the entire circumference, and the base portion 15b and the inner plate portion 15c are thereby fixed to the inner shaft. 12 and rotate together.

  As shown in FIG. 1, an engagement surface 14e facing the inner plate portion 15c of the output side member 15 is provided on the outer plate portion 14c on the input side member 14 side. The surface direction of the engagement surface 14e is an axis orthogonal direction.

  Similarly, the inner plate portion 15c on the output side member 15 side is provided with an engagement surface 15e facing the outer plate portion 14c side of the input side member 14, as shown in FIG. The surface direction of the engagement surface 15e is a direction perpendicular to the axis, and is in surface contact with the engagement surface 14e on the side of the outer plate portion 14c and is opposed in a slidable state. A gap is formed between the outer diameter surface of the inner plate portion 15c and the inner diameter surface 14d of the outer peripheral portion 14b.

The pulley 7 and the inner shaft 12 are supported by a first bearing portion 11 and a second bearing portion 13 provided on both sides in the axial direction so as to be relatively rotatable about the axis.
In the present embodiment, the first bearing portion 11 and the second bearing portion 13 each employ a ball bearing with a single seal. The seal is assembled so as to be positioned outside in the axial direction.

The first bearing portion 11 shown on the right side in FIG. 1 is press-fitted and fixed between the inner diameter surface 14 f of the outer peripheral portion 14 a and the outer diameter surface 12 a of the inner shaft 12.
That is, the first bearing portion 11 includes a bearing inner ring 11b fixed so as to be rotatable integrally with the inner shaft 12, a bearing outer ring 11a fixed so as to be rotatable integrally with the input side member 14, and the bearing inner ring 11b and the bearing. A ball (rolling element) 11c is provided between the outer ring 11a and the outer ring 11a. The ball 11c is housed in a raceway groove provided in the bearing inner ring 11b and the bearing outer ring 11a, and is freely rollable.

1 is press-fitted and fixed between the inner diameter surface 7a of the pulley 7 and the outer diameter surface 15d of the base portion 15b.
That is, the second bearing portion 13 includes a bearing inner ring 13b fixed so as to be rotatable integrally with the output side member 15, a bearing outer ring 13a fixed so as to be rotatable integrally with the pulley 7, and the bearing inner ring 13b and the bearing outer ring. A ball (rolling element) 13c housed between 13a and 13a is provided. The ball 13c is housed in a raceway groove provided in the bearing inner ring 13b and the bearing outer ring 13a and is freely rollable.

  Further, the inner plate portion 15c is provided with a recess 15a in the engagement surface 15e. A plate-like engagement piece 17 is accommodated in the recess 15a. As shown in FIG. 2, the engaging piece 17 is urged toward the opposite outer plate portion 14c by the elastic member 16 accommodated in the bottom portion 15a 'of the concave portion 15a.

  In this embodiment, the elastic member 16 uses a torsion coil spring having protruding portions 16a and 16b at both ends of the coil spring portion 16c. One of the protruding portions 16a and 16b is related to the bottom portion 15a 'and the other is related to the other. It hits the piece 17.

  As shown in FIG. 2 (b), when the elastic member 16 is deformed in a direction in which the two protruding portions 16a and 16b approach each other, the opposite direction to the approaching direction (the two protruding portions 16a and 16b). An elastic force acts (in a direction away from each other), and the elastic force biases the distal end 17a side of the engagement piece 17 as shown in FIG.

  Further, when the engagement piece 17 protrudes from the engagement surface 15e of the inner plate portion 15c toward the outer plate portion 14c by the biasing, the engagement surface 14e of the outer plate portion 14c An engagement concave portion 18 into which the engagement piece 17 can enter is provided.

As shown in FIG. 3, the engaging recess 18 is provided at a plurality of locations along the circumferential direction on the engaging surface 14e of the outer plate portion 14c. Since the number of the engagement recesses 18 can be freely set, for example, it can be set at four locations, six locations, or eight locations along the circumferential direction.
In this embodiment, the engagement piece 17 is provided at one place as a whole. However, if the engagement piece 17 is damaged, as a backup at the time of the damage, for example, along the circumferential direction. Three or five engagement pieces 17 may be arranged. However, it is desirable that the number of the engagement recesses 18 is larger than the number of the engagement pieces 17.

  Each engaging recess 18 has the same shape and size, and is provided in an equally divided direction along the circumferential direction. Each engaging recess 18 is provided at an inclined portion 18c that gradually becomes deeper from one side toward the other side along the circumferential direction, and an end portion on the other side of the inclined portion 18c. And a deep groove portion 18a formed so as to slightly drop from the other end portion of the inclined portion 18c.

  In this embodiment, the material of the engagement piece 17, the input side member 14 including the outer plate portion 14c, and the output side member 15 including the inner plate portion 15c is a C amount of 0.40% or more. Since it has been subjected to induction hardening, it has a hardness (HRC 50 or higher) that can exert a predetermined engaging force when the engaging piece 17 enters and engages with the engaging recess 18. .

Hereinafter, an operation when the pulley 7 as the input side relatively rotates around the axis with respect to the inner shaft 12 as the output side will be described.
When the input side member 14 and the output side member 15 are relatively rotated in one direction around the axis, for example, as indicated by an arrow A in FIG. Assume a case of rotation.

  When the input side member 14 rotates relative to the output side member 15 in the direction indicated by the arrow A in FIG. 2A, the engagement is performed when the engagement recess 18 faces the side of the engagement piece 17. The piece 17 is pushed to the right side in the figure by the urging force of the elastic member 16 with the rear end 17b side as a fulcrum. As a result, the engagement piece 17 enters the engagement recess 18.

When the engagement piece 17 enters the engagement recess 18, the tip 17 a engages with the end wall 18 b of the engagement recess 18.
By this engagement, the input side member 14 and the output side member 15 are coupled, and the input side member 14 and the output side member 15 are rotated together (engaged state). That is, the rotational force applied to the pulley 7 is transmitted to the inner shaft 12.

Further, from the state shown in FIG. 2A, when the input side member 14 rotates relative to the output side member 15 in the direction indicated by the arrow C in FIG. Then, it is pushed out to the left in the figure by the inclined portion 18c of the engaging recess 18. That is, the engagement piece 17 is pushed to the left side in the figure against the urging force of the elastic member 16 with the rear end 17b side as a fulcrum.
This extrusion gradually proceeds as the circumferential phase of the engagement piece 17 and the engagement recess 18 shifts, and at the position shown in FIG. Leave.

When the engagement piece 17 is disengaged from the engagement recess 18, the engagement between the tip 17 a and the end wall 18 b of the engagement recess 18 is released.
By this disengagement, the connection between the input side member 14 and the output side member 15 is also eliminated, and the input side member 14 and the output side member 15 are idled (idle state). That is, the rotational force applied to the pulley 7 is not transmitted to the inner shaft 12.

  In this way, the engagement piece 17 is configured to be fitted to the outer plate portion 14c and the inner plate portion 15c, so that compared to a conventional pulley with a built-in one-way clutch using sprags or rollers as an engagement element, The torque capacity per one engagement piece 17 (engagement element) is increased.

At the time of this engagement, the end surface of the tip 17a of the engagement piece 17 and the end wall 18b of the engagement recess 18 are in surface contact, and the end surface of the rear end 17b of the engagement piece 17 is in contact with the recess 15a. The end wall on the rear end side can come into surface contact (the state shown in FIG. 2A).
For this reason, torque is transmitted from the input side member 14 to the output side member 15 through the surface contact portion, and the pressure can be dispersed by the surface contact. Therefore, also in this point, there is an advantage that a predetermined torque capacity can be easily secured.

  Further, since a plurality of the engaging recesses 18 are provided along the circumferential direction of the plate portion, first, the relative rotation between the pulley 7 and the inner shaft 12 starts, The time lag until the engaging recess 18 faces can be reduced.

In order to reduce the time lag, it is desirable that the number of the engagement recesses 18 is larger. However, if the number of the engagement recesses 18 is equal to or approximately equal to the number of the engagement pieces 17, the circumferential play at the time of switching from the idling state to the engagement state increases and is input. It is assumed that the rotation fluctuation cannot be followed.
For this reason, when there is a request to reduce the play in the circumferential direction, it is desirable that either one of the number of engagement pieces 17 and the number of engagement recesses 18 is an odd number and the other is an even number. That is, when the number of engagement pieces 17 is an odd number, the number of engagement recesses 18 may be an even number, and when the number of engagement pieces 17 is an even number, the number of engagement recesses 18 may be an odd number. desirable.

  When a plurality of the engagement pieces 17 are provided, the position of the engagement pieces 17 and the positions of the engagement recesses 18 are set so that the plurality of engagement pieces 17 simultaneously enter and engage with the engagement recesses 18. Set the position.

  In the case where the pulley 7 is on the output side and the inner shaft 12 is on the input side, the relationship is opposite to the above-described action. This point will be described below. The right side indicated by reference numeral 14 in FIG. Assuming that the member is an output side member and the left side member indicated by reference numeral 15 is an input side member, when the input side member rotates relative to the output side member in the direction indicated by arrow B in FIG. When the engagement piece 17 faces the side of the engagement recess 18, the engagement piece 17 is pushed to the right side in the figure by the urging force of the elastic member 16 with the rear end 17 b side as a fulcrum. It is. As a result, the engagement piece 17 enters the engagement recess 18.

When the engagement piece 17 enters the engagement recess 18, the tip 17 a engages with the end wall 18 b of the engagement recess 18.
By this engagement, the input side member and the output side member are coupled, and the input side member and the output side member are rotated together (engaged state). That is, the rotational force applied to the inner shaft 12 is transmitted to the pulley 7.

When the input side member rotates relative to the output side member in the direction indicated by the arrow D in FIG. 2B from the state shown in FIG. 2A, the outer surface 17c of the engagement piece 17 is engaged. It is pushed out to the left in the figure by the inclined portion 18c of the combined recess 18. That is, the engagement piece 17 is pushed to the left side in the figure against the urging force of the elastic member 16 with the rear end 17b side as a fulcrum.
This extrusion gradually proceeds as the circumferential phase of the engagement piece 17 and the engagement recess 18 shifts, and at the position shown in FIG. Leave.

When the engagement piece 17 is disengaged from the engagement recess 18, the engagement between the tip 17 a and the end wall 18 b of the engagement recess 18 is released.
By releasing the engagement, the connection between the input side member and the output side member is also canceled, and the input side member and the output side member are idled (idle state). That is, the rotational force applied to the inner shaft 12 is not transmitted to the pulley 7.

  In these embodiments, the engagement concave portion 18 is provided in the outer plate portion 14c, and the engagement piece 17 and the concave portion 15a for accommodating the engagement piece 17 are provided in the inner plate portion 15, but conversely, the inner plate portion. The engagement recess 18 may be provided in 15c, and the engagement piece 17 and the recess 15a for accommodating it may be provided in the outer plate portion 14.

Cross-sectional view of one embodiment The main part expanded sectional view which shows the effect | action of the same embodiment, (a) is an engagement state, (b) is an idling state. The principal part expansion perspective view which shows the detail of an inner side plate part and an outer side plate part Cross section of conventional example Cross section of conventional example

Explanation of symbols

1, 20 One-way clutch 2 Inner ring 2a Inclined surface 2b Stepped portion 3 Engagement element 4 Outer ring 5 Elastic member 6 Rotating shaft 7 Pulleys 7a, 14d, 14f Inner diameter surface 10 One-way clutch built-in pulley 11 First bearing portion 12 Inner shaft 12a, 15d outer diameter surface 13 second bearing portion 14, 24 input side member 14a, 14b outer peripheral portion 14c outer plate portion 14e, 15e, 24e, 25e engagement surface 15, 25 output side member 15a recess 15a 'bottom portion 15b base portion 15c inner plate Parts 16, 26 elastic members 16a, 16b spring-out part 16c coil spring parts 17, 27 engaging piece 17a front end 17b rear end 17c outer side face 18, 24a engaging recess 18a deep groove part 18b end wall 18c inclined part

Claims (9)

Between the pulley (7) and the inner shaft (12) arranged on the same axis, plate portions (14c, 15c) having engaging surfaces (14e, 15e) facing in the axial direction are provided, and the plate portion ( 14c, 15c) is provided with an engagement piece (17), and the engagement piece (17) is urged from one plate portion (15c) toward the other plate portion (14c), and the other The engaging piece (17) protrudes from the one plate portion (15c) to the other plate portion (14c) side by the urging on the engaging surface (14e) of the plate portion (14c). An engagement recess (18) into which the engagement piece (17) can enter when
When the pulley (7) and the inner shaft (12) are relatively rotated in one direction around the axis, the engagement piece (17) is engaged with the engagement recess (18), thereby the pulley (7) When the inner shaft (12) is coupled and the pulley (7) and the inner shaft (12) rotate relative to each other in the other direction around the shaft, the engagement piece (17) is removed from the engagement recess (18). To release and release the bond,
One of the plate portions (14c, 15c) is an outer plate portion (14c) that rises radially inward from the inner diameter surface (7a) of the pulley (7) and rotates integrally with the pulley (7), and the other is The one-way clutch built-in pulley, which is an inner plate portion (15c) that rises radially outward from the outer diameter surface of the inner shaft (12) and rotates integrally with the inner shaft (12).   The outer plate portion (14c) rises radially inward from a cylindrical outer peripheral portion (14a, 14b) that is press-fitted and fixed to the pulley (7) and rotates integrally with the pulley (7). Item 2. The one-way clutch built-in pulley according to item 1.   The pulley with a built-in one-way clutch according to claim 2, wherein the outer plate portion (14c) rises from the middle in the axial direction of the outer peripheral portion (14a, 14b).   The inner plate portion (15c) rises radially outward from a cylindrical base portion (15b) that is press-fitted and fixed to the inner shaft (12) and rotates integrally with the inner shaft (12). The one-way clutch built-in pulley according to any one of 1 to 3.   The pulley (7) and the inner shaft (12) are first provided between an inner diameter surface (14f) of the outer peripheral portion (14a) and an outer diameter surface (12a) of the inner shaft (12). The one-way clutch built-in pulley according to any one of claims 1 to 4, wherein the pulley is supported by the bearing portion (11) so as to be relatively rotatable about an axis.   The pulley (7) and the inner shaft (12) are a second bearing portion provided between an outer diameter surface (15d) of the base portion (15b) and an inner diameter surface (7a) of the pulley (7). The pulley with a built-in one-way clutch according to any one of claims 1 to 5, wherein the pulley is supported so as to be relatively rotatable about an axis. One or a plurality of the engagement pieces (17) are provided along the circumferential direction of the plate portion, and the engagement recesses (18) are set at positions greater than the number of the engagement pieces (17). The one-way clutch built-in pulley according to any one of claims 1 to 6, wherein the engaging recesses (18) are provided along a circumferential direction of the plate portion.   The one-way clutch built-in pulley according to claim 7, wherein one of the number of the engagement pieces (17) and the number of the engagement recesses (18) is an odd number, and the other is an even number. .   The material of the outer plate portion (14c) and the inner plate portion (15c) is a material having a C content of 0.40% or more and subjected to induction hardening. One-way clutch built-in pulley as described in one.

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