JP2008256111A - Rotation transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive rotation transmission device simple in structure, reduced in the number of parts and assembling man-hours. <P>SOLUTION: An output shaft 20 capable of rotating forward/reversely and in a shape of a shaft is coaxially housed inside an input inner ring 10 capable of rotating forward/reversely and in a shape of a cylinder. An outer ring 30 in which friction resistance is applied to a static system is disposed to the outside of the input inner ring 10. A coil spring 40 elastically retaining an input inner ring 10 and an outer ring 30 is interposed between the input inner ring 10 and the outer ring 30 while being in a non-contact state with the output shaft 20, and in a contact state with the output shaft 20 by rotary torque inputted from the input inner ring 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is incorporated in, for example, an electric slide door or an electric shutter of an automobile or the like, and transmits a rotational torque from the input side to the output side, while having a function of blocking a reverse input torque from the output side. About.

  For example, as a rotation transmission device that is incorporated in an electric slide door or an electric shutter of an automobile or the like and transmits a rotational torque from the input side to the output side, and has a function of blocking a reverse input torque from the output side, There exists a thing of the structure disclosed by patent document 1. FIG.

  In Patent Document 1, as a rotation transmission device, an input side member and an output side member are provided, and a clutch portion that transmits and blocks torque between the input side member and the output side member, and a rotational drive source A mechanical reduction mechanism that decelerates the input rotation of the clutch and inputs it to the input side member of the clutch part, a housing that houses the clutch part and the reduction mechanism part, and a rotational drive source attached to the attachment part of the housing A rotary drive device including a motor is disclosed.

The clutch portion that constitutes the rotational drive device is interposed between the input side member and the output side member, and a torque transmission member that can be engaged with and disengaged from both the members in both forward and reverse rotation directions, and the torque transmission member A retainer that controls engagement / disengagement of the torque transmitting member through relative rotation with respect to the input side member, an elastic member that connects the input side member and the retainer in the rotational direction, and a housing or fixed to the housing A viscous fluid interposed between the stationary member and the stationary member.
JP 2002-213486 A

  By the way, the clutch part in the rotation drive device of the above-mentioned patent document 1 transmits the input torque in the forward and reverse directions from the input side member to the output side member via the torque transmission member, and the forward and reverse directions from the output side member. The function of blocking the reverse input torque with the input side member is exhibited.

  As a structure for exerting this clutch function, the clutch part includes a clutch outer ring as an input side member, a clutch inner ring as an output side member, a plurality of rollers as a torque transmission member, a cage, a centering spring as an elastic member, The main part is composed of a fixed ring as a stationary member and a viscous fluid such as silicon oil or grease interposed between the fixed ring and the cage.

  Thus, since the torque transmission member in the clutch portion is a roller, noise may be generated when the roller is engaged between the clutch outer ring and the clutch inner ring. In addition, in the environment where not only the input side member but also the clutch inner ring which is the output side member is driven, the torque transmission is arbitrarily cut off, so depending on the magnitude relationship of the input / output driving force There is a problem in that the rollers are repeatedly engaged and disengaged between the clutch outer ring and the clutch inner ring, and as a result, abnormal noise occurs.

  In addition, the above-described clutch section has a large number of components including a clutch outer ring, a clutch inner ring, a plurality of rollers, a cage, a centering spring, a fixing ring, and a viscous fluid. As a result, there has been a problem that the product cost increases.

  Accordingly, the present invention has been proposed in view of the above-mentioned problems, and the object of the present invention is to provide an inexpensive rotation transmission device with a simple structure by reducing the number of parts and the number of assembly steps. It is in.

  As a technical means for achieving the above-mentioned object, a rotation transmission device according to the present invention is a shaft-like second inner member that can rotate forward and backward inward of a cylindrical first inner member that can rotate forward and backward. A cylindrical outer member having a frictional resistance with respect to the stationary system is disposed outside the first inner member, and elastically holds the first inner member and the outer member. Is interposed between the first inner member and the outer member so as to be in contact with the second inner member by a rotational torque input from the first inner member in a non-contact state with the second inner member. To do.

  As the elastic member, one end portion extending radially outward is fitted into the groove of the outer member and locked in the circumferential direction, and the other end extending radially outward is the recess of the first inner member. A coil spring inserted into the hole and locked in the circumferential direction is suitable, and the elastic force of the coil spring is set smaller than the frictional resistance applied to the outer member with respect to the stationary system.

  In the present invention, the first inner member is an input member for rotational torque, and the second inner member is an output member.

  When rotational torque is applied from the first inner member that is the input side member, the first inner member presses the end of the coil spring that is the elastic member in the rotational direction, and is applied to the outer member with respect to the stationary system. The coil spring having the elastic force set smaller than the frictional resistance starts to bend. Due to the bending of the coil spring, the inner diameter of the coil spring is reduced and comes into contact with the second inner member. Due to the contact between the coil spring and the second inner member, the rotational torque applied to the first inner member is transmitted to the second inner member.

  On the other hand, even if rotational torque is applied from the second inner member that is the output side member, the first inner member and the outer member are elastically held in a neutral state by the elastic force of the coil spring, and the inner diameter of the coil spring and the second A gap is secured between the two members in a non-contact state with the inner member. As a result, the second inner member only idles, and the rotational torque is interrupted without being transmitted to the first inner member.

  In the configuration of the present invention described above, it is desirable to have a structure in which a plate for preventing the coil spring from dropping from between the first inner member and the outer member is provided. In this way, the coil spring can be prevented from falling off by the plate, so that it becomes easy to stabilize the operation of the coil spring.

  Moreover, in the structure of this invention mentioned above, it is desirable to set it as the structure which interposed the rolling bearing between the outer side member and the 2nd inner side member. By setting it as such a structure, an outer side member and a 2nd inner side member can be stably supported via a rolling bearing so that relative rotation is possible.

  According to the present invention, a shaft-like second inner member capable of forward / reverse rotation is accommodated coaxially inside a cylindrical first inner member capable of forward / reverse rotation, and a frictional resistance is exerted against a stationary system. The provided cylindrical outer member is disposed outside the first inner member, and the elastic member that elastically holds the first inner member and the outer member is in a non-contact state with the second inner member, and the first The first inner member, the second inner member, the outer member, and the elastic member are mainly provided by interposing between the first inner member and the outer member so as to be able to contact the second inner member by rotational torque input from the inner member. The rotation transmission device can be manufactured with the component parts. As a result, the number of parts can be reduced, the number of assembly steps can be reduced, the cost of the product can be reduced, and an inexpensive rotation transmission device can be provided.

  Further, the elastic member interposed between the first inner member and the outer member is brought into contact with the second inner member by elastic deformation of the elastic member between the first inner member and the second inner member. Since the torque can be transmitted, there is no sudden power transmission, so that it is possible to prevent abnormal noise.

  Embodiments of the rotation transmission device according to the present invention will be described in detail below. 1 is a longitudinal sectional view showing a rotation transmission device in a neutral state or a state where reverse input torque is applied from the output side, FIG. 2 is a transverse sectional view taken along line AA in FIG. 1, and FIG. FIG. 4 is a longitudinal sectional view showing the rotation transmitting device in a state where rotational torque is applied from the input side, and FIG. 4 is a transverse sectional view taken along line BB in FIG.

  As shown in FIGS. 1 and 2, the rotation transmission device in this embodiment includes a cylindrical input inner ring 10 as a first inner member, a shaft-shaped output shaft 20 as a second inner member, and an outer member. The cylindrical outer ring | wheel 30 and the coil spring 40 which is an elastic member are comprised by the principal part. In the rotation transmission device of this embodiment, in addition to the main components including the input inner ring 10, the output shaft 20, the outer ring 30 and the coil spring 40, the plate 52 secured to the input inner ring 10 by the retaining ring 51, the outer ring 30, A rolling bearing 53 disposed between the output shaft 20 is provided.

  The input inner ring 10 has a cylindrical shape having a U-shaped cross section in the axial direction, and a through hole 16 is formed in a bottom portion 14 integrally formed on one end side (left side in FIG. 1) of the cylindrical portion 12. The output shaft 20 is inserted in the forward and reverse directions. A slit hole 18 that is a concave hole extending in the axial direction is formed through a part of the cylindrical portion 12 of the input inner ring 10. The application of rotational torque from the input inner ring 10 is performed via an output shaft such as an electric motor that is coaxially connected to the input inner ring 10.

  The output shaft 20 has a shaft shape and is accommodated coaxially inside the input inner ring 10 described above. One end (the left side in FIG. 1) of the output shaft 20 is supported by one end of the outer ring 30 so as to be able to rotate forward and backward via a rolling bearing 53, and the other end is a plate 52 at the end of the cylindrical part 12 of the input inner ring 10. It is supported so that forward and reverse rotation is possible.

  The outer ring 30 has a cylindrical shape having a U-shaped cross section in the axial direction, and a through hole 36 is formed in a bottom 34 integrally formed on one end side (left side in FIG. 1) of the cylindrical portion 32. One end of the output shaft 20 is mounted via a rolling bearing 53. A slit groove 38 that is a concave groove extending in the axial direction is formed on a part of the cylindrical portion 32 of the outer ring 30 on the inner peripheral surface thereof. The outer ring 30 is arranged outside the input inner ring 10 and has a structure that accommodates the input inner ring 10 and the output shaft 20.

  As shown in FIG. 2, the outer ring 30 is set in a state where a frictional resistance 61 is applied to the stationary system 60. That is, the outer ring 30 is kept stationary when a rotational force smaller than the frictional resistance 61 against the stationary system 60 is applied, and starts rotating when a rotational force larger than the frictional resistance 61 is applied. .

  The coil spring 40 is interposed between the input inner ring 10 and the outer ring 30. The coiled portion 42 of the coil spring 40 is disposed between the input inner ring 10 and the output shaft 20 along the axial direction. Both end portions 44, 46 of the coiled portion 42 are bent radially outward and pass through the slit hole 18 of the input inner ring 10 and are accommodated in the slit groove 38 of the outer ring 30. Both end portions 44 and 46 of the coil-shaped portion 42 are spaced apart in the width direction of the slit hole 18 of the input inner ring 10 and the slit groove 38 of the outer ring 30, that is, across the circumferential width of the slit hole 18 and slit groove 38. (See FIG. 2).

  In this manner, the coil spring 40 elastically holds the input inner ring 10 and the outer ring 30, and the coil-shaped portion 42 is not in contact with the output shaft 20, and the inner diameter 48 of the coil spring 42 and the outer peripheral surface 22 of the output shaft 20 are A gap m is formed between them. As will be described later, when rotational torque is input from the input inner ring 10, the inner diameter 48 of the coil spring 40 is set so as to be in contact with the outer peripheral surface 22 of the output shaft 20 due to the reduced diameter of the coil spring 40. The elastic force of the coil spring 40 is set smaller than the frictional resistance 61 applied to the outer ring 30 with respect to the stationary system 60.

  A plate 52 is fixed to one end of the output shaft 20 in a state in which the plate 52 is prevented from coming off by a retaining ring 51. The plate 52 prevents the coil spring 40 from dropping from the axial openings of the input inner ring 10 and the outer ring 30. By preventing the coil spring 40 from falling off by the plate 52, the operation of the coil spring 40 can be stabilized.

  The operation of the rotation transmission device having the above configuration will be described in detail below. 1 and 2 show the rotation transmission device in a neutral state or a state where reverse input torque is applied from the output side, and FIGS. 3 and 4 show a state where rotation torque is applied from the input side. The rotation transmission device of is shown.

  As shown in FIGS. 3 and 4, when rotational torque (rotational force in the direction of the white arrow in FIG. 4) is applied from the input inner ring 10, the circumferential end surface 11 of the slit hole 18 of the input inner ring 10 becomes a coil. The end portion 44 of the spring 40 is pressed in the rotation direction. Here, since the elastic force of the coil spring 40 is set to be smaller than the frictional resistance 61 applied to the outer ring 30 with respect to the stationary system 60, the end 46 of the coil spring 40 has the slit groove 38 of the outer ring 30. The coil spring 40 starts to bend before the outer ring 30 starts to rotate by pressing the circumferential end surface 31 of the outer ring 30.

  Due to the bending of the coil spring 40, the inner diameter 48 of the coil spring 40 is reduced and comes into contact with the outer peripheral surface 22 of the output shaft 20. When the inner diameter 48 of the coil spring 40 comes into contact with the outer peripheral surface 22 of the output shaft 20, the rotational torque applied to the input inner ring 10 is transmitted to the output shaft 20 and the output shaft 20 rotates. At this time, since the end 46 of the coil spring 40 presses the circumferential end surface 31 of the slit groove 38 of the outer ring 30, the outer ring 30 rotates against the frictional resistance 61 against the stationary system 60.

  In the above description, the case where the rotational force in the direction indicated by the white arrow (counterclockwise) in FIG. 4 is applied from the input inner ring 10 is described. However, the rotational force in the direction opposite to the white arrow in FIG. Is the same when applied from the input inner ring 10, and as a result, the output shaft 20 can rotate in both forward and reverse directions by the application of rotational force from the input inner ring 10.

  On the other hand, when reverse input torque is applied from the output shaft 20 in the state shown in FIGS. 1 and 2, the input inner ring 10 and the outer ring 30 are elastically held in a neutral state by the elastic force of the coil spring 40, and the coil spring 40 A clearance m is secured between the inner diameter 48 of the coil spring 40 and the outer peripheral surface 22 of the output shaft 20 in a state where the inner diameter 48 of the output shaft 20 and the outer peripheral surface 22 of the output shaft 20 are not in contact with each other. As a result, the output shaft 20 is only idling due to the reverse input torque from the output shaft 20, and the rotational torque is interrupted without being transmitted to the input inner ring 10.

  Note that, regardless of whether the rotational force from the output shaft 20 is applied clockwise or counterclockwise, the output shaft 20 idles in both forward and reverse directions due to the rotational force applied from the output shaft 20. Due to the idling of the output shaft 20, the reverse input torque from the output shaft 20 is cut off.

  As described above, the rotation transmission device that transmits the rotational torque from the input inner ring 10 to the output shaft 20 and blocks the reverse input torque from the output shaft 20 includes the input inner ring 10, the output shaft 20, the outer ring 30, and the coil. It can be manufactured with components having the spring 40 as a main part. As a result, the number of parts can be reduced, the number of assembly steps can be reduced, the cost of the product can be reduced, and an inexpensive rotation transmission device can be provided.

  Further, torque is transmitted between the input inner ring 10 and the output shaft 20 such that the coil spring 40 is brought into contact with the output shaft 20 by elastic deformation of the coil spring 40 interposed between the input inner ring 10 and the outer ring 30. Since the structure is made possible, it is possible to prevent the generation of abnormal noise since there is no rapid power transmission.

  In the above-described embodiment, the output shaft 20 is supported by the rolling bearing 53 at one end of the outer ring 30. However, the present invention is not limited to this and the outer ring 30 is supported by the outer ring 30. In order to stably support the output shaft 20, it is also possible to support the output shaft 20 with rolling bearings at both ends of the output shaft 20.

  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 embodiment of this invention, it is a longitudinal cross-sectional view which shows the rotation transmission apparatus in the state in which the reverse input torque was provided from the neutral state or the output side. It is a cross-sectional view which follows the AA line of FIG. It is a longitudinal cross-sectional view which shows the rotation transmission apparatus in the state to which rotational torque was provided from the input side in embodiment of this invention. It is a cross-sectional view which follows the BB line of FIG.

Explanation of symbols

10 First inner member (input inner ring)
18 Concave hole (slit hole)
20 Second inner member (output shaft)
30 Outer member (outer ring)
38 Groove (slit groove)
40 Elastic member (coil spring)
44 One end of elastic member 46 Other end of elastic member 52 Plate 53 Rolling bearing 60 Static system 61 Friction resistance

Claims (5)

  The cylindrical second inner member that can be rotated forward and backward is coaxially accommodated inside the cylindrical first inner member that can rotate forward and backward, and has a cylindrical shape with frictional resistance applied to the stationary system. An outer member is disposed outside the first inner member, and an elastic member that elastically holds the first inner member and the outer member is in a non-contact state with the second inner member and from the first inner member. A rotation transmission device, wherein the rotation transmission device is interposed between the first inner member and the outer member so as to be able to come into contact with the second inner member by inputting the rotational torque.   The rotation transmission device according to claim 1, wherein an elastic force of the elastic member is set smaller than a frictional resistance applied to the outer member with respect to the stationary system.   In the elastic member, one end portion extending radially outward is inserted into the concave groove of the outer member and locked in the circumferential direction, and the other end portion extending radially outward is a recess hole of the first inner member. The rotation transmission device according to claim 1, wherein the rotation transmission device is a coil spring that is inserted and locked in a circumferential direction.   The rotation transmission device according to any one of claims 1 to 3, further comprising a plate for preventing the elastic member from falling off between the first inner member and the outer member.   The rotation transmission device according to any one of claims 1 to 4, wherein a rolling bearing is interposed between the outer member and the second inner member.

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