JP5902527B2 - Rotation transmission device - Google Patents

Description

  The present invention relates to a rotation transmission device used for switching rotation transmission and switching.

  2. Description of the Related Art Conventionally, a rotation transmission device that transmits and blocks rotation from a drive shaft to a driven shaft has a two-way clutch, and the engagement and release of the two-way clutch are controlled by an electromagnetic clutch. It has been.

  In the rotation transmission device described in Patent Document 1, a control cage and a rotation cage are alternately arranged between an outer ring and a cam ring incorporated therein, and pillar portions formed in each cage are alternately arranged in the circumferential direction. Assemble the pair of rollers in a pocket formed between adjacent pillars, and urge the pair of rollers away from each other by an elastic member built in between the opposed parts. The cam ring formed on the inner periphery of the outer ring and the cam surface formed on the outer periphery of the cam ring. The cam ring is rotated in one direction to move one roller to the cylinder surface and the cam surface. The rotation of the cam ring is transmitted to the outer ring.

  Further, an electromagnetic clutch is provided on the input shaft provided with the cam ring, and the control cage is moved in the axial direction by the electromagnetic clutch, and is provided between the opposing surfaces of the flange of the control cage and the flange of the rotary cage. The control retainer and the rotational retainer are relatively rotated in the direction in which the circumferential width of the pocket is reduced by the action of the torque cam, and the pair of rollers are moved to the disengagement position at the pillar portion of each retainer. The rotation transmission to is cut off.

  In the rotation transmission device, when the control cage is moved in a direction in which the flange of the control cage is separated from the flange of the rotation cage by the electromagnetic clutch, the rotation is controlled by the pressing action of the elastic member incorporated between the pair of opposed rollers. The cage and rotating cage rotate relative to each other in the direction of increasing the circumferential width of the pocket, and the pair of opposed rollers immediately engage the cylindrical surface and cam surface. It has the feature of being.

JP 2009-293679 A

  By the way, in the rotation transmission device described in Patent Document 1, a spring holder is fitted to the input shaft, and the engagement is formed on the inner surface of the spring holder on the flat surface provided at the outer peripheral position of the input shaft. The spring holder is prevented from rotating by engaging the mating surface, and the control holder and the rotary holder are held in the neutral position by the abutment of the pillar portion against the side edge of the brake piece formed on the outer periphery of the spring holder. However, since the pillar part abuts against the braking piece impactively and often with a slight time difference, the engaging part between the flat surface and the engaging surface is likely to be deformed or damaged. Deformation and damage may adversely affect the two-way clutch.

  That is, if deformation occurs in the engaging portion between the flat surface and the engaging surface, the spring holder rattles and moves in the axial direction. If tilt occurs during the movement, the movement of the control cage is hindered, and electromagnetic When energization of the clutch is released, the control retainer cannot be returned to the prescribed engagement position, and the two-way clutch is misengaged.

  In addition, since the entire control cage and rotation cage are accommodated in the outer ring, the outer ring having a long axial length is required, which increases the weight, and there are still points to be improved in order to reduce the weight. Has been.

  An object of the present invention is to provide a rotation transmission device that can be operated with high accuracy without misengaging a two-way clutch.

  In order to solve the above-described problems, in the present invention, a two-way clutch that transmits and blocks rotation from an input shaft to an output shaft that is arranged coaxially with the input shaft, and engagement of the two-way clutch And an electromagnetic clutch that controls release, and the two-way clutch forms a cylindrical surface on the inner periphery of the outer ring provided at the shaft end of the output shaft, and is provided at the shaft end of the input shaft. Provided on the outer periphery of the cam ring are a plurality of cam surfaces that form a wedge-shaped space whose both ends in the circumferential direction are narrow between the cylindrical surfaces and face each of the wedge spaces formed between the plurality of cam surfaces and the cylindrical surface. A pair of rollers and an elastic member that urges the pair of opposed rollers away from each other are incorporated, and each of the pair of opposed rollers is held by a cage, and the cage includes a control cage and a rotary cage. And holding both However, the same number of column portions as the cam surface are formed on the outer peripheral portion of the annular flange at intervals in the circumferential direction. Both of the cages have the flanges facing each other in the axial direction and the column portions are circumferential. The pockets for accommodating the pair of opposed rollers and the elastic member are formed between the adjacent pillar portions, and the opposing surfaces of the flange of the control cage and the flange of the rotary cage are formed as a combination alternately arranged in the direction. A torque cam for rotating the pair of cages relative to each other in a direction in which the circumferential width of the pockets is reduced by moving the control cage in a direction in which the distance between the opposing flanges is reduced; The roller and the elastic member are fitted with a spring holder that prevents the elastic member from falling out of the pocket, and the control retainer is narrowed by energizing the electromagnetic clutch so that the gap between the opposing flanges is reduced. In the rotation transmission device that is moved to each other, between the input shaft and the control retainer and between the input shaft and the rotation retainer, each retainer presses and displaces the pair of opposed rollers to the neutral position. A configuration provided with a rotation angle restricting means for preventing relative rotation in the same direction from the state is adopted.

  As described above, the control retainer and the rotation retainer are incorporated so that the axially opposed flanges are disposed between the outer ring and the electromagnetic clutch, so that the entire control retainer and the rotation retainer are disposed between the outer ring and the cam ring. The axial length of the outer ring can be made compact as compared with the case where it is built in.

  In the rotation transmission device configured as described above, when the control retainer is moved by the electromagnetic clutch in a direction in which the facing distance from the flange provided in the rotation retainer is narrowed, the rotation of the control retainer is maintained by the action of the torque cam. The container rotates relative to the direction in which the circumferential width of the pocket becomes narrower, and the pair of opposed rollers move toward the neutral position where they are pushed and disengaged by the column of the control cage and the column of the rotation cage. To do.

  At this time, since the rotation angle restricting means is provided between the input shaft, the control holder and the rotation holder, the control holder and the rotation holder are stopped when they are rotated by a predetermined angle toward the neutral position. Due to the stop, the pair of opposed rollers are held in the neutral position, and the rotation transmission from the input shaft to the output shaft is interrupted.

  Here, the rotation angle restricting means for stopping each of the control holder and the rotation holder at the neutral position is provided between the input shaft and the control holder and the rotation holder are stopped at the neutral position. The impact force when being held is not applied to the spring holder. For this reason, there is no inconvenience that the spring holder is rattled and tilted, and the movement of the control cage in the axial direction is not disturbed, and the two-way clutch can be operated accurately without misengaging.

  In the rotation transmission device according to the present invention, as the rotation angle restricting means, a protrusion is provided on the outer periphery of the input shaft, and the protrusion is inserted with sufficient margin in the circumferential direction on the inner periphery of the flange of the control retainer and the rotation retainer. The thing of the structure which provided the notch part is employable. At this time, a key that is generally employed for preventing rotation of the rotating component can be employed as the protruding portion.

  Further, the control retainer and the rotation retainer are incorporated so that the column portion is disposed between the outer ring and the cam ring, and the axially opposed flange is disposed between the outer ring and the electromagnetic clutch. The axial length of the outer ring can be made compact compared to the case where the entire cage is housed between the outer ring and the cam ring.

  In the present invention, as described above, the rotation angle restricting means is provided between the input shaft and the control cage and between the input shaft and the rotation cage, so that the control cage and the rotation cage are in the neutral position. It is possible to prevent the spring force from being applied to the spring holder when it is stopped. For this reason, there is no inconvenience that the spring holder is rattled and tilted and the movement of the control cage in the axial direction is prevented, and the two-way clutch can always be operated accurately without misengaging.

A longitudinal sectional view showing an embodiment of a rotation transmission device according to the present invention Sectional drawing which expands and shows the two-way clutch part of FIG. (A) is sectional drawing along the III-III line of FIG. 1, (b) is sectional drawing which shows the engagement state of a roller. Sectional view along line IV-IV in FIG. Sectional view along line VV in FIG. Sectional view along line VI-VI in FIG. (C) is a sectional view taken along line VII-VII in FIG. 6, and (d) is a sectional view showing an operating state. Sectional view along line VIII-VIII in FIG. (e) is an enlarged view of the rotation angle restricting means section shown in FIG. 8, and (f) is an enlarged view showing a restriction release state.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of a rotation transmission device according to the present invention. As shown in the figure, the rotation transmission device includes an input shaft 1, an output shaft 2 arranged coaxially with the input shaft 1, a housing 3 that covers the shaft ends of both shafts, and the housing 3. The two-way clutch 10 that transmits and shuts off the rotation from the input shaft 1 to the output shaft 2 and the electromagnetic clutch 60 that controls the engagement and release of the two-way clutch 10.

  The housing 3 has a cylindrical shape, and a small-diameter bearing cylinder 4 is provided at one end thereof, and the output shaft 2 is rotatably supported by a bearing 5 incorporated in the bearing cylinder 4.

  As shown in FIGS. 1 to 3, the two-way clutch 10 is provided with a cylindrical surface 12 on the inner periphery of the outer ring 11 provided at the shaft end portion of the output shaft 2 and provided at the shaft end portion of the input shaft 1. A plurality of cam surfaces 14 are formed in the circumferential direction on the outer periphery of the cam ring 13, and a pair of rollers 15 and an elastic member 20 are assembled between each of the plurality of cam surfaces 14 and the cylindrical surface 12. The cam ring 13 is rotated in one direction, and one of the pair of rollers 15 is engaged with the cylindrical surface 12 and the cam surface 14 to transmit the rotation of the cam ring 13 to the outer ring 11. During rotation in the direction, the other roller 15 is engaged with the cylindrical surface 12 and the cam surface 14 to transmit the rotation of the cam ring 13 to the outer ring 11.

  Here, a small-diameter concave portion 17 is formed on the inner surface side of the closed end portion of the outer ring 11, and the shaft end portion of the input shaft 1 is rotatably supported by a bearing 18 incorporated in the concave portion 17.

  The cam ring 13 is formed integrally with the input shaft 1. A cam surface 14 formed on the outer periphery of the cam ring 13 is formed of a pair of inclined surfaces 14a and 14b inclined in opposite directions, and is wedge-shaped with both ends in the circumferential direction being narrow between the cylindrical surface 12 of the outer ring 11. A space is formed, and a flat spring support surface 19 facing the tangential direction of the cam ring 13 is provided between the pair of inclined surfaces 14 a and 14 b, and the elastic member 20 is supported by the spring support surface 19.

  The elastic member 20 consists of a coil spring. The elastic member 20 is incorporated between the pair of rollers 15, and the elastic member 20 biases the pair of rollers 15 in the separating direction to engage the cylindrical surface 12 and the cam surface 14. Is arranged.

  The holder 16 includes a control holder 16A and a rotary holder 16B. As shown in FIG. 2 and FIG. 6, the control retainer 16 </ b> A is provided with the same number of column portions 22 as the cam surface 14 on the outer peripheral portion of one surface of the annular flange 21 at equal intervals in the circumferential direction. An arc-shaped long hole 23 is formed on the outer periphery, and a cylindrical portion 24 is provided on the outer periphery in a direction opposite to the column portion 22.

  On the other hand, the rotation cage 16B is configured such that the same number of column portions 26 as the cam surface 14 are provided at equal intervals in the circumferential direction on the outer periphery of the annular flange 25.

  The control retainer 16A and the rotation retainer 16B are a combination in which the column portions 26 of the rotation retainer 16B are inserted into the elongated holes 23 of the control retainer 16A, and the column portions 22 and 26 are alternately arranged in the circumferential direction. ing. In the combined state, the tip portions of the column portions 22 and 26 are disposed between the outer ring 11 and the cam ring 13, and the flange 21 of the control retainer 16 </ b> A and the flange 25 of the rotation retainer 16 </ b> B are fitted to the outer periphery of the input shaft 1. The support ring 28 and the outer ring 11 are integrated.

  By incorporating the cages 16A and 16B as described above, as shown in FIG. 3, a pocket 27 is formed between the column portion 22 of the control cage 16A and the column portion 26 of the rotary cage 16B. A pair of opposed rollers 15 and an elastic member 20 are incorporated in each pocket 27 so as to face the 13 cam surfaces 14 in the radial direction.

  As shown in FIG. 2, the flange 21 of the control holder 16A and the flange 25 of the rotary holder 16B are slidably supported along a slide guide surface 29 formed on the outer periphery of the input shaft 1, and the rotary holder 16B. A thrust bearing 30 is incorporated between the flange 25 and the support ring 28 fitted to the input shaft 1.

  The thrust bearing 30 rotatably supports the rotary cage 16B in a state that prevents the rotary cage 16B from moving to the electromagnetic clutch 60 side.

  As shown in FIG. 2, FIG. 8, and FIG. 9, between the input shaft 1 and the control holder 16A and between the input shaft 1 and the rotary holder 16B, the respective holders 16A and 16B are opposed to each other. A rotation angle restricting means 40 is provided for preventing the roller 15 from further rotating in the same direction from the state in which the roller 15 is pressed and displaced to the neutral position.

  The rotation angle restricting means 40 fits and fixes a key 42 as a protrusion in an axial groove 41 formed on the outer periphery of the input shaft 1, while the inner periphery of the flange 21 in the control retainer 16 </ b> A and Notches 43 and 44 into which the key 42 is inserted with a margin are provided on the inner periphery of the flange 25 in the rotary retainer 16B, and the control retainer 16A is placed in a neutral position by abutment of one side edge of the notch 43 with respect to the key 42. The rotation retainer 16B is stopped and held in the neutral position by the abutment of the other side edge of the notch 44 with the key 42.

  As shown in FIGS. 2 and 6, a torque cam 50 is provided between the flange 21 of the control holder 16A and the flange 25 of the rotary holder 16B. As shown in FIGS. 7 (c) and 7 (d), the torque cam 50 gradually increases as it reaches both ends deeper in the center in the circumferential direction on the opposing surfaces of the flange 21 in the control holder 16A and the flange 25 in the rotary holder 16B. A pair of opposed cam grooves 51 and 52 that are shallower are provided, and a ball 53 is incorporated between one end of one cam groove 51 and the other end of the other cam groove 52.

  The cam grooves 51 and 52 are arc-shaped grooves here, but may be V-grooves.

  When the control holder 16A moves in the axial direction in a direction in which the flange 21 of the control holder 16A approaches the flange 25 of the rotary holder 16B, as shown in FIG. Is moved toward the deepest position of the cam grooves 51 and 52, and the control holder 16A and the rotary holder 16B are relatively rotated in the direction in which the circumferential width of the pocket 27 is reduced. .

  As shown in FIGS. 2, 4, and 5, a cylindrical holder fitting surface 54 having a diameter larger than that of the slide guide surface 29 is formed at the intersection of the axial end of the cam ring 13 and the slide guide surface 29. The spring holder 55 is fitted to the holder fitting surface 54.

  The spring holder 55 is prevented from rotating by engagement between an engagement surface 56 formed at a position opposed to the inner periphery of the spring holder 55 and a flat surface 57 provided on the holder fitting surface 54 and is non-movable in the axial direction. A retaining piece 58 for preventing the roller 15 from dropping off in the axial direction is provided on the outer periphery. Further, the retaining piece 58 is provided with a spring holding piece 59 for preventing the elastic member 20 from moving outward in the radial direction and moving in the axial direction.

  As shown in FIG. 1, the electromagnetic clutch 60 includes an armature 61 that axially opposes the end surface of the cylindrical portion 24 formed in the control retainer 16A, a rotor 62 that axially opposes the armature 61, and the rotor 62 and an electromagnet 63 opposed in the axial direction.

  As shown in FIG. 2, the armature 61 is fitted to the outer periphery of the support ring 28 and supported rotatably and slidably on the inner surface of the connecting cylinder 65 provided on the outer periphery of the armature 61. The cylinder 24 of the control holder 16A is press-fitted, and the control holder 16A and the armature 61 are connected and integrated. With this connection, the armature 61 is slidably supported at two locations in the axial direction of the cylindrical outer diameter surface 64 of the support ring 28 and the slide guide surface 29 on the outer periphery of the input shaft 1.

  Here, the support ring 28 is positioned in the axial direction by a step portion 31 formed on the other side in the axial direction of the slide guide surface 29 of the input shaft 1.

  The rotor 62 is fitted to the input shaft 1, is positioned in the axial direction by a shim 66 incorporated between the support ring 28, and is prevented from rotating with respect to the input shaft 1.

  As shown in FIG. 1, the electromagnet 63 includes an electromagnetic coil 63 a and a core 63 b that supports the electromagnetic coil 63 a. The core 63 b is fitted into the other end opening of the housing 3, and the other end of the housing 3. It is prevented from being removed by a retaining ring 6 attached in the opening of the part. The core 63b is rotatable relative to the input shaft 1 via a bearing 67 fitted to the input shaft 1.

  The rotation transmission device shown in the embodiment has the above-described structure. When the energization of the electromagnetic coil 63a of the electromagnetic clutch 60 shown in FIG. 1 is interrupted, the roller 15 of the two-way clutch 10 is as shown in FIG. Further, it is in a state of engaging with the cylindrical surface 12 of the outer ring 11 and the cam surface 14 of the cam ring 13.

  For this reason, when the input shaft 1 rotates in one direction, the rotation is transmitted from the cam ring 13 to the outer ring 11 through one of the pair of opposed rollers 15, and the output shaft 2 rotates in the same direction as the input shaft 1. When the input shaft 1 rotates in the opposite direction, the rotation is transmitted to the output shaft 2 via the other roller 15.

  In the engaged state of the two-way clutch 10 as described above, in the rotation angle restricting means 40, as shown in FIG. 9 (f), the key 42 provided on the input shaft 1 and the flange 21 of the control cage 16A are attached. There is a disengaged state in which a gap is formed between both side edges of the formed notch 43 and the notch 44 formed in the flange 25 of the rotary cage 16B.

  When the electromagnetic coil 63a of the electromagnetic clutch 60 is energized while the two-way clutch 10 is engaged, an attractive force acts on the armature 61, and the armature 61 moves in the axial direction and is attracted to the rotor 62.

  At this time, since the armature 61 and the control holder 16A are connected and integrated by fitting the connecting cylinder 65 and the cylinder portion 24, the control holder 16A moves along with the movement of the armature 61 in the axial direction. The flange 21 moves in a direction approaching the flange 25 of the rotary cage 16B.

  Due to the relative movement of the control holder 16A and the rotary holder 16B, the ball 53 shown in FIG. 7 (d) is directed to the deepest position of the cam grooves 51 and 52 as shown in FIG. 7 (c). The control holder 16A and the rotary holder 16B rotate relative to each other in the direction in which the circumferential width of the pocket 27 decreases.

  Due to the relative rotation of the control holder 16A and the rotary holder 16B, the pair of opposed rollers 15 shown in FIG. 3 (b) is pushed by the column portion 22 of the control holder 16A and the column portion 26 of the rotary holder 16B to be neutral with each other. Move towards position.

  At this time, as shown in FIG. 8, since the rotation angle restricting means 40 is provided between the input shaft 1 and the control holder 16A and the rotation holder 16B, the control holder 16A and the rotation holder 16B. When the roller 15 rotates by a predetermined angle in the direction of pressing and moving the roller 15 toward the neutral position, as shown in FIG. 9 (e), one side edge of the notch 43 formed in the flange 21 of the control holder 16A and The other side edge of the notch 44 formed in the flange 25 of the rotary cage 16B abuts on the key 42. Due to the contact, the control holder 16A and the rotation holder 16B are stopped, and the pair of opposed rollers 15 are held in the disengaged state as shown in FIG.

  For this reason, even if the input shaft 1 rotates, the rotation is not transmitted to the output shaft 2, and the input shaft 1 rotates freely.

  Here, since the rotation angle restricting means 40 for stopping each of the control holder 16A and the rotation holder 16B at the neutral position is provided between the input shaft 1 and the control holder 16A and the rotation holder 16B. The impact force when each of them is stopped and held at the neutral position is only applied to the input shaft 1 and is not applied to the spring holder 55 shown in FIG.

  Unlike the embodiment, as in the rotation transmission device described in the prior art document, the structure is such that the control holder and the rotation holder are stopped and held at the neutral position by the spring holder that is prevented from rotating around the input shaft. When the control holder and the rotation holder are stopped, the impact force is applied to the spring holder, causing rattling between the input shaft and the spring holder moving in the axial direction to cause tilting. When the energization is released, the control cage cannot be returned to the prescribed engagement position, and the two-way clutch is misengaged.

  However, in the embodiment, the impact force when each of the control holder 16A and the rotary holder 16B is stopped and held in the neutral position is only applied to the input shaft 1 and is not applied to the spring holder 55. Therefore, there is no inconvenience that the spring holder 55 moves and tilts in the axial direction. For this reason, the spring holder 55 does not hinder the movement of the control retainer 16A in the axial direction, and the two-way clutch 10 can be accurately operated without misengaging.

  Further, in the embodiment shown in FIG. 1, the control cage 16A and the rotary cage 16B are configured such that the column portions 22 and 26 are located between the outer ring 11 and the cam ring 13 and the flanges 21 and 25 facing in the axial direction are the outer rings. 11 and the armature 61, the axial length of the outer ring 11 can be made compact and lightweight.

DESCRIPTION OF SYMBOLS 1 Input shaft 2 Output shaft 10 Two-way clutch 11 Outer ring 12 Cylindrical surface 13 Cam ring 14 Cam surface 15 Roller 16 Retainer 16A Control retainer 16B Rotation retainer 21 Flange 22 Column 25 Flange 26 Column 27 Pocket 40 Rotation angle restricting means 42 key (protrusion)
43 Notch 44 Notch 50 Torque cam 55 Spring holder 60 Electromagnetic clutch

Claims (3)

A two-way clutch for transmitting and blocking rotation from an input shaft to an output shaft arranged coaxially with the input shaft, and an electromagnetic clutch for controlling engagement and release of the two-way clutch; A directional clutch forms a cylindrical surface on the inner periphery of the outer ring provided at the shaft end portion of the output shaft, and a circumferential direction between the outer periphery of the cam ring provided at the shaft end portion of the input shaft and the cylindrical surface. Are provided with a plurality of cam surfaces that form a narrow wedge-shaped space at both ends, and a pair of opposed rollers and a pair of opposed rollers are separated from each other in the wedge space formed between the plurality of cam surfaces and the cylindrical surface. An elastic member that biases in the direction, each of the pair of opposed rollers is held by a cage, and the cage is composed of a control cage and a rotary cage, both of which are annular flanges The same number of cam surfaces on the outer periphery of The pillars are configured to be spaced apart in the circumferential direction, and both the cages are adjacent combinations in which the flanges are opposed in the axial direction and the pillars are alternately arranged in the circumferential direction. A pocket for accommodating the pair of opposed rollers and the elastic member is formed between the portions, and the gap between the opposed flanges is reduced between the opposed surfaces of the flange of the control cage and the flange of the rotary cage. A torque cam that relatively rotates the pair of retainers in a direction in which the circumferential width of the pocket decreases by the movement of the control retainer, and prevents the pair of rollers and the elastic member from dropping from the pocket on the input shaft. In the rotation transmission device fitted with a spring holder and moved in a direction in which the interval between the opposing flanges is narrowed by energizing the electromagnetic clutch,
The flanges of the flange and the rotary cage of the control cage by the outer periphery of the input shaft slidably supported, rotary holding the outer periphery of the inner periphery of each other and the input shaft in the flange of the outer periphery and the control cage of the input shaft between the inner periphery of each other in the flange of the vessel, each cage is provided a rotation angle restricting means for preventing the relative rotation further the same direction from the state of being pressed displaced opposed pair of rollers to the neutral position, the control The rotation transmission device , wherein the retainer and the rotation retainer have a pillar portion disposed between the outer ring and the cam ring, and a flange disposed between the outer ring and the electromagnetic clutch .   The rotation angle regulating means has a configuration in which a protrusion is provided on the outer periphery of the input shaft, and a cutout portion in which the protrusion is inserted with sufficient margin in the circumferential direction is provided on the inner periphery of the flange of the control retainer and the rotation retainer. The rotation transmission device according to claim 1. The rotation transmission device according to claim 2, wherein the protrusion includes a key.

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