JP2008144849A - Rotation transmitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control switching of transmission and cutoff of rotation torque without using an electromagnetic clutch. <P>SOLUTION: The device comprises: a first/second inner rings 10, 20 coaxially arranged freely rotatably in the normal/reverse directions; an outer ring 30 coaxially arranged at the outside of the second inner ring freely rotatably in the normal/reverse directions; a plurality of rollers 40a, 40b capable of being engaged/disengaged in wedge spaces Ma, Mb between cam surfaces 14, 24 of the first/second inner rings and inner circumference surface 32 of the outer ring; a first spring 60 interposed between the cam surface of the second inner ring and the inner circumference surface of the outer ring and biasing each roller in the wedge space in the engagement direction; and a second spring 70 interposed between the first/second inner rings and biasing each roller in the wedge space in the disengagement direction by relatively rotating both rollers in the reverse direction. Furthermore, the device is provided with a switch 80 interposed between the first/second inner rings and controlling engagement/disengagement of the rollers in the wedge space by switching the rotation directions of the first/second inner rings relatively rotated in the reverse direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotation transmission device used for switching between transmission and cutoff of power.

  As this type of rotation transmission device, there is one having a structure in which switching of power transmission and switching is controlled by an electromagnetic clutch (for example, see Patent Document 1).

  The rotation transmission device disclosed in Patent Document 1 is incorporated between an inner member, an outer member provided outside the inner member, an inner periphery of the outer member, and an outer periphery of the inner member. An armature made of a magnetic material movable in the axial direction, a roller incorporated in the armature and engageable between the inner periphery of the outer member and the outer periphery of the inner member, and the roller being the outer periphery of the inner member And a switch spring that elastically holds the armature in a neutral position that is disengaged from the inner periphery of the outer member, a rotor that is fixed to the inner periphery of the outer member or the outer periphery of the inner member, and faces the armature, It is composed of an electromagnet that faces the rotor and attracts the armature to the rotor by energization.

  In the rotation transmission device having the above-described configuration, the armature is separated from the rotor and the roller is moved between the inner periphery of the outer member and the outer periphery of the inner member by the elastic force of the switch spring when the electromagnet is cut off. It is held in the disengaged neutral position. As a result, even if rotational torque is input to the inner member and the inner member rotates, the rotation is not transmitted to the outer member, and only the inner member rotates freely.

  On the other hand, when the electromagnet is energized in the rotation state of the inner member, the armature is attracted to the rotor, and the armature is coupled to the outer member via the rotor. As a result, the inner member and the armature rotate relative to each other, and the roller engages between the inner periphery of the outer member and the outer periphery of the inner member by the relative rotation. For this reason, the rotation of the inner member is transmitted to the outer member via the roller, and the outer member rotates in the same direction as the inner member.

Further, when the inner member and the armature rotate relative to each other, the switch spring is elastically deformed. Therefore, when the electromagnet is de-energized, the armature is rotated by the elastic restoring force of the switch spring, and the roller returns to the neutral position where the engagement is released between the inner periphery of the outer member and the outer periphery of the inner member. Thus, torque transmission from the inner member to the outer member is interrupted.
JP 2006-248463 A

  By the way, in the conventional rotation transmission device described above, switching between power transmission and interruption is controlled by an electromagnetic clutch having an electromagnet that attracts the armature to the rotor by energization. For this reason, if the electromagnetic clutch is not energized continuously, the rotation torque cannot be continuously transmitted from the inner member to the outer member. Therefore, when this rotation transmission device is mainly used in the power transmission state There is a problem that power consumption increases.

  Further, in this rotation transmission device, when the rotation of the inner member and the outer member is switched in the forward and reverse directions in the power transmission state from the inner member to the outer member, that is, in the energized state of the electromagnetic clutch, Since the engagement state of the roller is switched between the inner periphery of the inner member and the outer periphery of the inner member, rattling occurs by switching the engagement state of the roller. There is a possibility.

  Therefore, the present invention has been proposed in view of the above-mentioned problems, and the object of the present invention is to control the switching between transmission and interruption of rotational torque by simple means without using an electromagnetic clutch. The object is to provide a rotation transmission device.

  As technical means for achieving the above-described object, the present invention provides a first inner member and a second inner member, which are coaxially arranged so as to be rotatable forward and backward, a first inner member and a first inner member. An outer member that is coaxially disposed on the outer side of the two inner members and capable of rotating forward and reverse, and between the outer peripheral surface of the first inner member and the second inner member and the inner peripheral surface of the outer member A plurality of pairs of engagement elements arranged so as to be disengageable in the wedge space formed between the outer peripheral surface of the first inner member and the inner peripheral surface of the outer member, and of the second inner member A first elastic member that is inserted between each pair of engagement elements interposed between the outer peripheral surface and the inner peripheral surface of the outer member, and urges each engagement element in a direction to engage with the wedge space; The second inner member is inserted between the first inner member and the second inner member, and both inner members are rotated relative to each other in the opposite direction so that each of the engagement elements is urged in the wedge space. Elasticity The first inner member and the second inner member are inserted between the first inner member and the second inner member, and the rotation directions of the first inner member and the second inner member that rotate in opposite directions are switched. Thus, a switching member for controlling the engagement / disengagement of the engagement element in the wedge space is provided.

  The rotation transmission device according to the present invention includes a first inner member and a second inner member that are coaxially disposed so as to be freely rotatable forward and backward, and includes a first inner member and a second inner member. The first inner member and the second inner member are switched by switching the rotation directions of the first inner member and the second inner member that rotate relative to each other in the opposite direction by a switching member interposed therebetween. The engagement and disengagement of the engaging element in the wedge space formed between the outer peripheral surface of the outer member and the inner peripheral surface of the outer member is controlled. This makes it possible to switch between transmission and interruption of rotational torque without using an electromagnetic clutch in a conventional rotation transmission device.

  In addition, a plurality of pairs of engagement elements are arranged so as to be disengageable in a wedge space formed between the outer peripheral surface of the first inner member and the second inner member and the inner peripheral surface of the outer member. And a pair of members interposed between the outer peripheral surface of the first inner member and the inner peripheral surface of the outer member and between the outer peripheral surface of the second inner member and the inner peripheral surface of the outer member. The first elastic member is inserted between the joints, and the first elastic member is used to urge each engagement element in the wedge space so that the input rotation direction can be switched between forward and reverse. Since the engagement element is engaged in the wedge space in both the forward rotation side and the reverse rotation side, the engagement state of the engagement element is not switched and no play is generated.

  On the other hand, the switching member in the above-described configuration is disposed between the first inner member and the second inner member so as to be freely rotatable, and the first inner member relatively rotates in the opposite direction by the rotation. A structure having a flat cam portion for switching the rotation direction of the second inner member is desirable. In the case of such a structure, the rotation direction of the first inner member and the second inner member that rotate relative to each other in the reverse direction can be switched by rotating the switching member by mechanical operation.

  Further, the switching member in the above-described configuration is arranged so as to be movable in the radial direction between the first inner member and the second inner member, and the first member relatively rotates in the reverse direction by the radial movement. A structure having an axial cam portion that switches the rotation direction of the inner member and the second inner member is also desirable. In the case of such a structure, the rotational direction of the first inner member and the second inner member that rotate relative to each other in the opposite direction can be switched by moving the switching member in the radial direction by mechanical operation.

  According to the present invention, the rotational directions of the first inner member and the second inner member that are inserted between the first inner member and the second inner member and relatively rotate in opposite directions are determined. By providing a switching member that controls the switching and engagement / disengagement of the engagement element in the wedge space, it is possible to transmit rotational torque by mechanical operation of the switching member without using an electromagnetic clutch in a conventional rotation transmission device. Since switching of interruption | blocking is realizable, the power consumption by an electromagnetic clutch can be eliminated and an inexpensive rotation transmission apparatus can be provided.

  A plurality of pairs of engagement elements arranged to be disengageable in a wedge space formed between the outer peripheral surface of the first inner member and the second inner member and the inner peripheral surface of the outer member; And a pair of members interposed between the outer peripheral surface of the first inner member and the inner peripheral surface of the outer member and between the outer peripheral surface of the second inner member and the inner peripheral surface of the outer member. Since there is a first elastic member that is inserted between the joints and biases each engaging element in the direction in which it engages in the wedge space, there is no backlash when the rotational direction is switched between forward and reverse in the power transmission state. Therefore, the generation of abnormal noise can be prevented and the life of the rotation transmission device can be improved.

  Hereinafter, embodiments of the rotation transmission device according to the present invention will be described in detail. 1 and 2 show a first embodiment of the present invention, in which FIGS. 1A and 1B show a power transmission state, and FIGS. 2A and 2B show a power cut-off state, respectively. 3 and 4 show a second embodiment of the present invention. FIGS. 3A and 3B show a power transmission state, and FIGS. 4A and 4B show a power cut-off state.

  In these embodiments, the case where the present invention is applied to a rotation transmission device of a type in which the power transmission state is set to the locked state will be described. However, the present invention is not limited to this, and the power transmission state is not set to the locked state. It can also be applied to a type of rotation transmission device.

  The rotation transmission device in the first embodiment shown in FIGS. 1A and 1B includes a first inner ring 10 that is a first inner member, a second inner ring 20 that is a second inner member, and an outer member. The outer ring 30, rollers 40 a and 40 b as a plurality of pairs (four pairs in the figure), a retainer 50, a first spring 60 as a first elastic member, and a second spring 70 as a second elastic member. The main part is composed of the switch 80 which is a switching member.

  The first inner ring 10 and the second inner ring 20 are rotatably fitted on guide pins 92 planted on a side plate 90 that is a stationary member, and are coaxially rotatable relative to each other in the forward and reverse directions while being joined together. Has been placed.

  The first inner ring 10 has a convex portion 12 that protrudes in the radial direction at equal circumferential intervals (90 ° intervals) and extends in the axial direction (left direction in FIG. 1B). The surface is a cam surface 14 that forms a wedge space Ma with which the roller 40 a can be engaged and disengaged with the inner peripheral surface 32 of the outer ring 30. Moreover, the 1st inner ring | wheel 10 has the notch part 16 which notched the part in V shape.

  On the other hand, the second inner ring 20 protrudes in the radial direction at equal circumferential intervals (90 ° intervals) and further extends in the axial direction opposite to the first inner ring 10 (right direction in FIG. 1B). The outer peripheral surface of the convex portion 22 is a cam surface 24 that forms a wedge space Mb between which the roller 40 b can be engaged and disengaged with the inner peripheral surface 32 of the outer ring 30. Moreover, the 2nd inner ring | wheel 20 has the notch part 26 which notched the part in V shape. Furthermore, the 2nd inner ring | wheel 20 has the axial part 28 which made the center site | part protrude in the axial direction [FIG.1 (b) left direction].

  The convex portion 22 of the second inner ring 20 is arranged in a state where the phase is shifted by a predetermined angle in the circumferential direction with respect to the convex portion 12 of the first inner ring 10. Further, a part of the notch 26 of the second inner ring 20 overlaps with a part of the notch 16 of the first inner ring 10, so that the notch 16 of the first inner ring 10 and the notch 26 of the second inner ring 20 are overlapped. It is arranged in a state of penetrating in the axial direction.

  The outer ring 30 is disposed coaxially outside the first inner ring 10 and the second inner ring 20 so as to be able to rotate forward and backward. That is, the outer ring 30 is integrally provided on the cylindrical large-diameter portion 34 that accommodates the first inner ring 10 and the second inner ring 20 described above, and one end side (left side in FIG. 1B) of the large-diameter portion 34. The other end side of the large-diameter portion 34 is rotatably supported on the side plate 90 via the rolling bearing 100 and the small-diameter portion 36 is supported by the shaft portion of the second inner ring 20 via the rolling bearing 102. 28 is rotatably supported. The rolling bearing 102 interposed between the small diameter portion 36 and the shaft portion 28 of the second inner ring 20 is prevented from coming off by a retaining ring 104 attached to the shaft portion 28 of the second inner ring 20.

  A plurality of pairs (four pairs in FIG. 1A) of rollers 40 a and 40 b are arranged at equal intervals (90 ° intervals) along the circumferential direction of the outer ring 30. Of each pair of rollers 40 a and 40 b, one roller 40 a is engaged in a wedge space Ma formed between the cam surface 14 of the convex portion 12 of the first inner ring 10 and the cylindrical inner peripheral surface 32 of the outer ring 30. The other roller 40b is arranged so as to be able to be engaged and disengaged, and can be engaged and disengaged in a wedge space Mb formed between the cam surface 24 of the convex portion 22 of the second inner ring 20 and the cylindrical inner peripheral surface 32 of the outer ring 30. It is arranged in.

  The cage 50 includes a bottomed cylindrical cage main body 52 opened at one end side (left side in FIG. 1B) and a cover plate 54 that closes the opening of the cage main body 52. The bottom portion is fixedly disposed by screwing to the side plate 90. Thereby, the bottom portion of the cage body 52 is interposed between the side plate 90 and the first inner ring 10. Pockets 56a and 56b that accommodate the rollers 40a and 40b in a rollable manner are formed in a cylindrical portion that integrally extends in the axial direction from the bottom of the cage main body 52. The lid plate 54 supports the opening of the cage main body 52 and is prevented from coming off by a retaining ring 106 attached to the root portion of the shaft portion 28 of the second inner ring 20.

  The first spring 60 is a wedge space Ma formed between each pair of rollers 40 a and 40 b, that is, between the cam surface 14 of the convex portion 12 of the first inner ring 10 and the cylindrical inner peripheral surface 32 of the outer ring 30. Engagement / disengagement is achieved by one roller 40a arranged to be disengageable, and a wedge space Mb formed between the cam surface 24 of the convex portion 22 of the second inner ring 20 and the cylindrical inner peripheral surface 32 of the outer ring 30. It is interposed between the other roller 40b arranged as possible. The elastic force of the first spring 60 biases each pair of rollers 40a and 40b toward the narrow side of the wedge spaces Ma and Mb, thereby causing the cam surfaces 14 and 24 of the first inner ring 10 and the second inner ring 20 and the outer ring 30 to be biased. The inner peripheral surface 32 is engaged with each other. In FIG. 1A, due to the elastic force of the first spring 60, each pair of rollers 40a, 40b has cam surfaces 14, 24 of the first inner ring 10 and the second inner ring 20 on the narrow side of the wedge spaces Ma, Mb. The state which has engaged between the inner peripheral surface 32 of the outer ring | wheel 30 and the outer ring | wheel 30 is shown.

  The second spring 70 is interposed between the opposed end surfaces of the convex portion 12 of the first inner ring 10 and the convex portion 22 of the second inner ring 20. The elastic force of the second spring 70 causes the first inner ring 10 and the second inner ring 20 to rotate in opposite directions (in FIG. 1 (a), the first inner ring 10 is counterclockwise and the second inner ring 20 is clockwise). It is urged in the direction to make it. Thereby, the convex part 12 of the 1st inner ring | wheel 10 and the convex part 22 of the 2nd inner ring | wheel 20 which makes a pair with this will be spaced apart along the circumferential direction, As a result, the convex part of the 1st inner ring | wheel 10 12 and the cam surface 24 of the convex part 22 of the second inner ring 20 make a wedge angle with respect to the inner peripheral surface 32 of the outer ring 30, and each pair of rollers 40 a, 40 b has a wedge space Ma, Mb. It will leave with. In FIG. 2A, the pair of rollers 40a and 40b is moved into the wedge spaces Ma and Mb by the elastic force of the second spring 70, and the cam surfaces 14 and 24 of the first inner ring 10 and the second inner ring 20 A state in which the minute gaps Sa and Sb are formed between the inner ring 32 and the inner ring 32 of the outer ring 30 by separating from the outer ring 32 is shown.

  The switch 80 is a round bar-like member having a flat cam portion 82 provided at the front end and a lever portion 84 having a rear end bent into an L shape, and is freely rotatable on the side plate 90 and the bottom of the cage 50. Is inserted. The cam portion 82 of the switch 80 has a flat plate shape, and a part of the notch portion 26 of the second inner ring 20 overlaps with a part of the notch portion 16 of the first inner ring 10 to form a notch portion of the first inner ring 10. 16 and the notch 26 of the second inner ring 20 are arranged in a portion penetrating in the axial direction, on the inclined surface 11 of the notch 16 of the first inner ring 10 and the inclined surface 21 of the notch 26 of the second inner ring 20. It is in contact. The lever portion 84 of the switch 80 is led out from the side plate 90 and disposed outside the rotation transmission device.

  In the switch 80, by rotating the lever portion 84, the cam portion 82 is in a horizontal posture or a vertical posture between the first inner ring 10 and the second inner ring 20, so By switching the rotation directions of the rotating first inner ring 10 and second inner ring 20, the engagement and disengagement of the rollers 40a and 40b in the wedge spaces Ma and Mb are controlled.

  An operation example of the rotation transmission device of the first embodiment having the above-described configuration will be described in detail below.

  1A and 1B show the power transmission state (the locked state of the outer ring 30). In this state, the cam portion 82 of the switch 80 is held in a horizontal posture. That is, the cam portion 82 is interposed between the first inner ring 10 and the second inner ring 20 with a plate width larger than the plate thickness. At this time, the first inner ring 10 is pressed counterclockwise by the elastic force of the second spring 70, and the second inner ring 20 is pressed clockwise. The cam portion 82 and the inclined surface 11 of the notch portion 16 of the first inner ring 10 and the notch portion of the second inner ring 20 are positioned so as to restrict the rotation of the first inner ring 10 and the second inner ring 20 with respect to this pressing force. 26 is in contact with the inclined surfaces 21 and is sandwiched between the inclined surfaces 11 and 21.

  On the other hand, due to the elastic force of the first spring 60, each pair of rollers 40a and 40b interposed between the first inner ring 10 and the second inner ring 20 and the outer ring 30 has one roller 40a and the other roller 40b circumferentially. It is pressed so as to be separated in the direction. Of each pair of rollers 40a, 40b, one roller 40a is directed to the narrow side of the wedge space Ma formed between the cam surface 14 of the convex portion 12 of the first inner ring 10 and the inner peripheral surface 32 of the outer ring 30. The other roller 40 b is urged to engage between the cam surface 14 of the first inner ring 10 and the inner peripheral surface 32 of the outer ring 30, and the other roller 40 b is connected to the cam surface 24 of the convex portion 22 of the second inner ring 20 and the outer ring 30. The wedge space Mb formed between the inner peripheral surface 32 and the inner peripheral surface 32 is biased toward the narrow side and engaged between the cam surface 24 of the second inner ring 20 and the inner peripheral surface 32 of the outer ring 30. .

  As a result, even if rotational torque is input to the outer ring 30, the first inner ring 10 and the second inner ring 20 are engaged with the outer ring 30 via the rollers 40 a and 40 b, and the switch 80 attached to the stationary side plate 90. Therefore, since the position of the rotation of the first inner ring 10 and the second inner ring 20 is restricted, the rotational torque from the outer ring 30 is transmitted to the stationary side plate 90. That is, the outer ring 30 is locked.

  At this time, of each pair of rollers 40a and 40b, one roller 40a is formed on the narrow side (counterclockwise side) of the wedge space Ma between the cam surface 14 of the first inner ring 10 and the inner peripheral surface 32 of the outer ring 30. ) Is engaged between the cam surface 14 of the first inner ring 10 and the inner peripheral surface 32 of the outer ring 30, and the other roller 40 b is connected to the cam surface 24 of the second inner ring 20 and the inner periphery of the outer ring 30. It is biased toward the narrow side (clockwise side) of the wedge space Mb between the surface 32 and is engaged between the cam surface 24 of the second inner ring 20 and the inner peripheral surface 32 of the outer ring 30. . That is, the rollers 40a and 40b are engaged in the wedge spaces Ma and Mb in both the counterclockwise direction and the clockwise direction. Thereby, even if the direction of the rotational torque input to the outer ring 30 is switched between the forward and reverse directions, the play does not occur because the engagement state of the rollers 40a and 40b is not switched.

  Next, FIGS. 2A and 2B show a power cut-off state (the idling state of the outer ring 30) in which the switch 80 is turned 90 ° from the power transmission state shown in FIGS. 1A and 1B. By rotating the lever portion 84 of the switch 80 by 90 °, the cam portion 82 of the switch 80 is held in a vertical posture. That is, the cam portion 82 is interposed between the first inner ring 10 and the second inner ring 20 with a plate thickness smaller than the plate width. Due to the reduction of the contact width of the cam portion 82, the first inner ring 10 rotates counterclockwise and the second inner ring 20 rotates clockwise due to the elastic force of the second spring 70.

  By this rotation, the convex portion 12 of the first inner ring 10 and the convex portion 22 of the second inner ring 20 paired with the first inner ring 10 are separated along the circumferential direction. The wedge angle formed by the cam surface 14 and the cam surface 24 of the convex portion 22 of the second inner ring 20 with respect to the inner peripheral surface 32 of the outer ring 30 is increased. As a result, each pair of rollers 40a and 40b pressed so as to be separated in the circumferential direction by the elastic force of the first spring 60 is pressed against the outer end surfaces of the pockets 56a and 56b of the cage 50 by the pressing force. The wedge spaces Ma and Mb are separated from each other, and minute gaps Sa and Sb are generated between the rollers 40 a and 40 b and the inner peripheral surface 32 of the outer ring 30. Therefore, the outer ring 30 and the rollers 40a and 40b can rotate relative to each other in both the clockwise direction and the counterclockwise direction. That is, the outer ring 30 is idled.

  When the outer ring 30 is switched from the idling state (see FIGS. 2A and 2B) to the locked state (see FIGS. 1A and 1B), the lever portion 84 of the switch 80 described above is reversely operated. Thus, the first inner ring 10 and the second inner ring 20 may be operated in reverse.

  In the first embodiment described above, the case where the switch 80 having the flat plate cam portion 82 is used as the switching member for switching the locked state and the idling state of the outer ring 30 has been described. However, the present invention is not limited to this. Instead, the switch 81 having the shaft-like cam portion 83 can be used as the switching member as in the second embodiment shown in FIGS. 3 and 4.

  3 (a) and 3 (b) correspond to FIGS. 1 (a) and 1 (b) in the first embodiment, and show the locked state of the outer ring 30, and FIGS. 4 (a) and 4 (b) show the first embodiment. It corresponds to FIGS. 2A and 2B in the embodiment, and shows the idling state of the outer ring 30. Note that, in the second embodiment, the same parts as those in the rotation transmission device in the first embodiment are denoted by the same reference numerals, and redundant description is omitted. The difference between the two embodiments is only a switch 80 having a flat cam portion 82 and a switch 81 having a shaft cam portion 83 as switching members.

  The switch 80 in the first embodiment rotates the cam portion 82 by 90 ° by the turning operation of the lever portion 84, and the inclined surface 11 of the notched portion 16 of the first inner ring 10 and the notched portion of the second inner ring 20. The rotation direction of the first inner ring 10 and the second inner ring 20 is switched by decreasing or increasing the contact width of the cam portion 82 interposed between the inclined surfaces 21 of the 26. On the other hand, the switch 81 in the second embodiment switches the locked state and the idling state of the outer ring 30 by moving in the radial direction.

  That is, in the rotation transmission device according to the second embodiment, as shown in FIGS. 3A and 3B, the switch 81 is a round bar-like member having a shaft-like cam portion 83 at the front end and a lever portion 85 at the rear end. Yes, and inserted through the side plate 90 and the bottom of the cage 50 so as to be movable in the radial direction. The switch 81 can be moved in the radial direction by forming a slit 94 having a long hole shape along the radial direction in a part of the bottom of the side plate 90 and the cage 50. The cam portion 83 of the switch 81 is configured such that a part of the notch portion 26 of the second inner ring 20 overlaps with a part of the notch portion 16 of the first inner ring 10 and the second notch 16 of the first inner ring 10 and the second notch 16. The notch 26 of the inner ring 20 is disposed in a portion penetrating in the axial direction and is brought into contact with the inclined surface 11 of the notch 16 of the first inner ring 10 and the inclined surface 21 of the notch 26 of the second inner ring 20. Yes. The lever portion 85 of the switch 81 is led out from the side plate 90 and disposed outside the rotation transmission device.

  In the switch 81, the lever portion 85 is linearly moved in the radial direction to change the radial position of the cam portion 83 between the first inner ring 10 and the second inner ring 20, thereby rotating in the opposite direction. By switching the rotation directions of the first inner ring 10 and the second inner ring 20, the engagement and disengagement of the rollers 40a and 40b in the wedge spaces Ma and Mb are controlled.

  That is, in the locked state of the outer ring 30 shown in FIGS. 3A and 3B, the switch 81 is held at the radially innermost end position (lowermost position). At this time, the first inner ring 10 is pressed counterclockwise by the elastic force of the second spring 70, and the second inner ring 20 is pressed clockwise. The cam portion 83 has the inclined surface 11 of the notch 16 of the first inner ring 10 and the notch of the second inner ring 20 so that the position of the rotation of the first inner ring 10 and the second inner ring 20 is restricted with respect to this pressing force. 26 is in contact with the inclined surfaces 21 and is sandwiched between the inclined surfaces 11 and 21.

  On the other hand, due to the elastic force of the first spring 60, each pair of rollers 40a and 40b interposed between the first inner ring 10 and the second inner ring 20 and the outer ring 30 has one roller 40a and the other roller 40b circumferentially. The one roller 40a is urged toward the narrow side of the wedge space Ma formed between the cam surface 14 of the first inner ring 10 and the inner peripheral surface 32 of the outer ring 30. The other roller 40b is in a state of being urged and engaged with the narrow side of the wedge space Mb formed between the cam surface 24 of the second inner ring 20 and the inner peripheral surface 32 of the outer ring 30. Yes.

  As a result, even if rotational torque is input to the outer ring 30, the first inner ring 10 and the second inner ring 20 are engaged with the outer ring 30 via the rollers 40 a and 40 b, and the switch 81 attached to the stationary side plate 90. Therefore, since the position of the rotation of the first inner ring 10 and the second inner ring 20 is restricted, the rotational torque from the outer ring 30 is transmitted to the stationary side plate 90. That is, the outer ring 30 is locked.

  At this time, as in the case of the first embodiment, since the rollers 40a and 40b are engaged in the wedge spaces Ma and Mb in both the counterclockwise direction and the clockwise direction, the rotational torque input to the outer ring 30 is reduced. Even if the direction is switched between forward and reverse, there is no backlash due to the absence of switching of the engagement state of the rollers 40a and 40b.

  Next, as shown in FIGS. 4A and 4B, the switch 81 is moved from the locked state of the outer ring 30 shown in FIGS. 3A and 3B to the outermost radial side end position (uppermost end position) in the radial direction. If it moves to, the contact point of the cam part 83 will move to a radial direction outer side. As a result, due to the elastic force of the second spring 70, the first inner ring 10 rotates counterclockwise and the second inner ring 20 rotates clockwise.

  By this rotation, the convex portion 12 of the first inner ring 10 and the convex portion 22 of the second inner ring 20 are separated along the circumferential direction, and the cam surface 14 of the convex portion 12 of the first inner ring 10 and the second The wedge angle formed between the cam surface 24 of the convex portion 22 of the inner ring 20 and the inner peripheral surface 32 of the outer ring 30 is increased. As a result, due to the elastic force of the first spring 60, each pair of rollers 40a, 40b is pressed against the outer end surfaces of the pockets 56a, 56b of the cage 50 by the pressing force, and is separated from the wedge spaces Ma, Mb. Small gaps Sa and Sb are generated between 40a and 40b and the inner peripheral surface 32 of the outer ring 30. Therefore, the outer ring 30 and the rollers 40a and 40b can rotate relative to each other in both the clockwise direction and the counterclockwise direction. That is, the outer ring 30 is idled.

  When switching from the idling state of the outer ring 30 (see FIGS. 4A and 4B) to the locked state (see FIGS. 3A and 3B), the lever portion 85 of the switch 81 described above is reversely operated. Thus, the first inner ring 10 and the second inner ring 20 may be operated in reverse.

  The present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the scope of the present invention. The scope of the present invention is not limited to patents. It includes the equivalent meanings recited in the claims, and the equivalent meanings recited in the claims, and all modifications within the scope.

In the power transmission state of the rotation transmission device according to the first embodiment of the present invention, (a) is a sectional view taken along line BB in (b), and (b) is a section taken along line AA in (a). FIG. In the power cutoff state of the rotation transmission device in the first embodiment of the present invention, (a) is a cross-sectional view taken along line DD in (b), and (b) is a cross-sectional view taken along line CC in (a). FIG. In the power transmission state of the rotation transmission device according to the second embodiment of the present invention, (a) is a sectional view taken along line FF in (b), and (b) is a section taken along line EE in (a). FIG. (A) is sectional drawing which follows the HH line of (b), (b) is a cross section which follows the GG line of (a) in the power interruption state of the rotation transmission apparatus in 2nd embodiment of this invention. FIG.

Explanation of symbols

10 First inner member (first inner ring)
14 The outer peripheral surface (cam surface) of the first inner member
20 Second inner member (second inner ring)
24 The outer peripheral surface (cam surface) of the second inner member
30 Outer member (outer ring)
32 Inner peripheral surface 40a, 40b of outer member Engagement element (roller)
60 First elastic member (first spring)
70 Second elastic member (second spring)
80, 81 switching member (switch)
82 Flat cam portion 83 Shaft cam portion Ma, Mb Wedge space

Claims (3)

A first inner member and a second inner member arranged coaxially so as to freely rotate in the forward and reverse directions, and a forward and reverse rotation arranged coaxially on the outer sides of the first inner member and the second inner member. A plurality of outer members that can be engaged and disengaged in a wedge space formed between the outer peripheral surface of the first inner member and the second inner member and the inner peripheral surface of the outer member. A pair of engaging elements are interposed between the outer peripheral surface of the first inner member and the inner peripheral surface of the outer member, and between the outer peripheral surface of the second inner member and the inner peripheral surface of the outer member. Between the first elastic member and the first inner member and the second inner member that are inserted between the pair of engaging members and bias the engaging members in the direction in which the engaging members are engaged in the wedge space. A second elastic member that is interposed between the second elastic member and urges the inner members in a direction to disengage each engaging member in the wedge space by rotating the inner members in opposite directions.
By switching the rotation directions of the first inner member and the second inner member, which are inserted between the first inner member and the second inner member and relatively rotate in opposite directions, a wedge is obtained. A rotation transmission device comprising a switching member for controlling engagement / disengagement of an engagement element in a space.   The switching member is rotatably arranged between the first inner member and the second inner member, and the first inner member and the second inner member that rotate relative to each other in the opposite direction by the rotation. The rotation transmission device according to claim 1, further comprising a flat cam portion that switches a rotation direction of the member.   The switching member is arranged so as to be movable in a radial direction between the first inner member and the second inner member, and the first inner member and the second inner member that rotate relative to each other in the radial direction by the radial movement. The rotation transmission device according to claim 1, further comprising a shaft-like cam portion that switches a rotation direction of the two inner members.

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