JP2007292164A - One-way torque transmission unit and one-way intermittent feed unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a toque transmission unit wherein a plurality of wedge type pockets are formed in the outer diameter face of an internal member in the peripheral direction, rolling elements and their energizing springs are stored in the pockets and an external member is fitted to the internal member in a relatively rotatable manner, having improved workability in assembling processes while eliminating troubles in removing the energizing springs from the pockets. <P>SOLUTION: Each of the energizing spring 7 has a free end 8 contacting the rolling element 6, an intermediate portion 9, and a fixed end 10 contacting the inner end face of the pocket 3, and is bent into an S-shape consisting of a free end side curved portion 11 turning around one end of the free end 8 and ranging to one end of the intermediate portion 9, and a fixed end side curved portion 12 turning around the other end of the intermediate portion 9 and ranging to the fixed end 10. The energizing spring 7 is stored in the attitude that free end side curved portion 11 is directed to the bottom face side of the pocket 3 and the fixed end side curve 12 is directed to the open side of the pocket 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a one-way torque transmission unit with good assemblability and a one-way intermittent feed unit using the same.

  A one-way clutch type torque limiter is conventionally known as a one-way torque transmission unit used in office machines and the like. It is also known that if the biasing spring constant is set to be relatively small with the same configuration as this torque limiter, it can be used as a one-way clutch. In the present invention, both are collectively referred to as a one-way torque transmission unit. Further, a one-way intermittent feed unit incorporating the torque limiter is conventionally known (see Patent Document 1).

  12 (a) and 12 (b) show a part of the conventional torque limiter described above, and a fitting surface of one of the inner member 1 and the outer member 2 fitted so as to be relatively rotatable. A plurality of pockets 3 are formed on the outer circumferential surface (in the illustrated case, the outer diameter surface of the internal member 1) with a predetermined interval in the circumferential direction. Each pocket 3 has both end surfaces open to both end surfaces of the internal member 1. . A cam surface 4 that is inclined in a circumferential direction is formed on the bottom surface of each pocket 3, and a wedge portion 5 having a wedge angle θ is formed between the cam surface 4 and the inner diameter surface of the external member 2 facing the cam surface 4. A rolling element (roller) 6 is interposed in the wedge part 5 of the pocket 3 and a biasing spring 7 for biasing the rolling element 6 in the narrow direction of the wedge part 5 is connected to the enlarged side end of the wedge part 5 and the pocket. 3 is housed between the three end faces.

  When the inner member 1 is fixed to the frame and the outer member 2 is rotatably fitted, when the outer member 2 rotates in the direction of expansion of the wedge portion 5 indicated by the arrow A, the rolling element 6 is biased. Since the spring 7 is compressed and moved in the expanding direction of the wedge portion 5, the external member 2 is idled. On the other hand, when the outer member 2 rotates in the opposite direction, the rolling member 6 moves in the narrow direction of the wedge portion 5 and locks, so that the outer member 2 cannot be rotated.

  When the spring force of the biasing spring 7 is selected to be relatively large so that the rolling element 6 contacts the external member 2 with a pressing force of a certain level or more when the external member 2 rotates in the arrow A direction, Since torque is generated, it functions as a torque limiter. If the spring constant of the urging spring 7 is set to be relatively small so that the torque during idling is reduced, it functions as a one-way clutch.

  The urging spring 7 is provided to stabilize the posture and position of the roller 6 and to perform an accurate operation as a torque limiter or a clutch, and is formed by bending a leaf spring. As shown in FIG. 12B, the bent shape has a free end portion 8 that contacts the rolling element 6, an intermediate portion 9, and a fixed end portion 10 that contacts the inner end surface of the pocket 3, The free end side bent portion 11 that folds one end portion of the free end portion 8 and reaches one end of the intermediate portion 9 and the fixed end that folds the other end portion of the intermediate portion 9 and reaches one end of the fixed end plate portion 10. It consists of a side curved portion 12 and is bent into an S shape as a whole. The biasing spring 7 is accommodated in such a posture that the free end side bending portion 11 and the fixed end side bending portion 12 face the axial direction of the pocket 3, that is, both open end surfaces.

In addition, although the above described the example which provided the pocket 3 in the outer-diameter surface of the internal member 1, the pocket 3 was provided in the internal-diameter surface of the external member 2, the internal member 1 was fixed, and the external member 2 was supported rotatably. In some cases, a configuration is taken.
Japanese Patent Laying-Open No. 2005-98490 (FIGS. 5 and 7, FIG. 9, FIG. 11, FIG. 20 and FIG. 22)

  In the assembly process of the torque limiter, as shown in FIG. 13, in the state where the rolling elements 6 and the biasing springs 7 are assembled in the pockets 3 of the internal member 1, the tapered inner diameter surface (the minimum diameter is the outer member). 2) is fitted to the rolling element 6 while circumscribing the rolling element 6, and the jig 14 is rotated in the idling direction indicated by the arrow A, so that the rolling element 6 is attached to the wedge part 5. Move to the enlargement side. As a result, the rolling element 6 compresses the urging spring 7, and at the same time, the diameter of the rolling element 6 is reduced to a size that matches the inner diameter of the external member 2. The jig 14 is pushed down while fitting the outer member 2 around the inner member 1 in the reduced diameter state, and the jig 14 is replaced with the outer member 2. Thereby, a desired one-way clutch type torque limiter is obtained.

  In FIG. 13, the meaning indicated by reference numeral “14 (2)” indicates a state in which the internal member 1 is fitted on the jig 14 and a state after the jig 14 is replaced with the external member 2 at the same time. It is.

  In the above assembly process, when the jig 14 is rotated in order to reduce the diameter of the circumscribed circle of the rolling element 6, the rolling element 6 compresses the free end 8 of the biasing spring 7 (FIG. 12A). (See arrow a in b)). At this time, the tip of the free end 8 is pushed in, so that the rolling element 6 is skewed (see the dashed line in FIG. 12B), and the stress (see arrow b) that is pulled out in the axial direction acts on the free end side curved portion 11. To do. Due to the stress, the urging spring 7 may come off in the axial direction and come out of the pocket 3. When such spring disengagement occurs, the operation is interrupted, so that the assembly workability is hindered.

  In FIG. 12A, the meaning indicated by reference numeral “2 (14)” means that the torque limiter in a completed state in which the external member 2 is fitted to the internal member 1 and the external member 2 are fitted. The state in which the jig 14 is fitted to the internal member 1 in the previous stage is shown at the same time.

  In view of the problem of spring disengagement in the assembly process described above, the present invention eliminates the problem of spring disengagement in the assembly process, and provides a one-way torque transmission unit such as a torque limiter with good assemblability and a one-way intermittent feed unit using the same. The issue is to provide.

  In order to solve the above problems, the following configuration is adopted for the one-way torque transmission unit according to the present invention. That is, as shown in FIG. 1, a circumferential direction is applied to a fitting surface (also an outer diameter surface) of one member (internal member 1 in the figure) of the inner member 1 and the outer member 2 fitted so as to be relatively rotatable. A plurality of pockets 3 are formed at predetermined intervals. Both end surfaces of each pocket 3 are opened to both end surfaces of the internal member 1 or the external member 2, and cam surfaces 4 inclined in a constant circumferential direction are formed on the bottom surfaces of the pockets 3 and face the cam surfaces 4. A wedge portion 5 is formed between the other member (external member 2) (the wedge angle of the wedge portion 5 is indicated by θ). A rolling element 6 is interposed in the wedge part 5 of the pocket 3 and an urging spring 7 for urging the rolling element 6 in the narrow direction of the wedge part 5 is an enlarged side end part of the wedge part 5 and an end face of the pocket 3. It is stored between.

  In the one-way torque transmission unit as described above, in the present invention, the biasing spring 7 bends a leaf spring material having a constant width (see FIG. 1C) and contacts the rolling element 6 at a free end. Part 8, intermediate part 9, and fixed end 10 that contacts the inner surface of the end of pocket 3 are formed. A free end side bending portion 11 that folds one end portion of the free end portion 8 and reaches one end of the intermediate portion 9 and a fixed end side bending portion that folds the other end portion of the intermediate portion 9 and reaches one end of the fixed end portion. 12 is bent into an S shape.

  A feature of the present invention is that the biasing spring 7 has its free end side curved portion 11 directed toward the bottom surface of the pocket 3 and the fixed end side curved portion 12 directed toward the open side of the pocket 3. It is the structure accommodated by the attitude | position (refer FIG.1 (b)).

  In the one-way torque transmission unit configured as described above, when the outer member 2 is rotated relative to the inner member 1 in the direction of expansion of the pocket 3 (see arrow A in FIG. 1A), the rolling element 6 is biased. Since the spring 7 is compressed and moved to the enlargement side of the wedge portion 5, the external member 2 is idled. When the external member 2 rotates in the opposite direction, the rolling element 6 moves to the narrow side of the wedge portion 5 to be locked, and the internal member 1 and the external member 2 are integrated.

  In the assembly process of the one-way torque transmission unit, when the diameter of the circumscribed circle of the rolling element 6 of the internal member 1 is reduced using a required jig 14 (see FIG. 13), the rolling element 6 is biased by the biasing spring 7. In the present invention, as shown in FIG. 1B, the rolling element 6 compresses the free end 8 as indicated by the arrow a. Even if a stress b as shown by an arrow b acts on the end-side curved portion 11, the stress b acts in a direction toward the bottom surface of the pocket 3, so that the urging spring 7 is pivoted in the radial direction from the pocket 3. Never get out of the direction.

  Incidentally, as shown in FIG. 1 (d), the biasing spring 7 is opposed to the above, the free end side bending portion 11 is directed to the open end of the pocket 3, and the fixed end side bending portion 12 is placed in the pocket. 3, the stress b acting on the free end side bending portion 11 is directed toward the open side of the pocket 3, so that it escapes in that direction, and contacts the inner diameter surface of the jig in the assembly process. Since the rotation of the jig 14 is hindered, smooth assembly cannot be performed. Moreover, since the free end side curved portion 11 contacts the inner diameter surface of the external member 2 during use, there is a disadvantage that smooth relative rotation between the internal member 1 and the external member 2 is hindered.

  Therefore, as shown in FIGS. 1A and 1B, the biasing spring 7 is assembled in such a manner that the free end side bending portion 11 faces the bottom surface of the pocket 3 and the fixed end side bending portion 12 is in the pocket 3. It must be stored in a posture that faces the open side.

  As shown in FIGS. 2 (a) and 2 (b), even in the case of the type in which the pocket 3 is provided on the inner diameter surface of the external member 2, the biasing spring 7 has the free end side curved portion 11 at the bottom surface of the pocket 3. The fixed-end-side curved portion 12 is stored in a posture toward the open side of the pocket 3. When the rolling element 6 compresses the free end portion 8 by the rotation of the external member 2 in the direction of arrow A (see arrow a), the stress b directed toward the bottom surface of the pocket 3 acts on the free end side curved portion 11. The urging spring 7 does not come off and does not contact the internal member 1 during use.

  As described above, in the torque transmission unit according to the present invention, the biasing spring of the rolling element housed in the pocket has its free end side curved portion facing the bottom surface side of the pocket, and the fixed end side curved portion is the open side of the pocket. In the assembly process, spring disengagement is avoided and workability is improved. Further, there is no inconvenience of contacting the opposing member even during use, and an accurate and smooth operation as a torque limiter or a one-way clutch can be performed.

  The first embodiment shown in FIGS. 3 to 5 is an embodiment in which the torque transmission unit shown in FIG. 1 is used as a one-way clutch type torque limiter 20. Six pockets 3 are formed on the outer diameter surface of the internal member 1 at equal intervals in the circumferential direction, and both end surfaces of each pocket 3 are opened to both end surfaces of the internal member 1.

  A cam surface 4 that is inclined in a constant circumferential direction is formed on the bottom surface of each pocket 3, and a wedge portion 5 is formed between the cam surface 4 and the external member 2 (the wedge angle of the wedge portion 5 is indicated by θ). .) A rolling element 6 is interposed in the wedge part 5 of the pocket 3 and an urging spring 7 for urging the rolling element 6 in the narrow direction of the wedge part 5 is an enlarged side end part of the wedge part 5 and an end face of the pocket 3. It is stored between. A bearing projection 25 having the same inner diameter and the same inner diameter is provided on the front end face of the shaft hole 24 of the internal member 1.

  The outer member 2 is formed in an annular shape, and a sprocket 21 is formed on the outer diameter surface thereof. An internal toothed ratchet 22 is provided on the front end surface of the sprocket 21 in the axial direction, and a boss portion 23 is provided on the rear end surface of the sprocket 21 (see FIGS. 4 and 5). The internal member 1 is fitted to the boss portion 23.

  As in the case described above, the urging spring 7 includes a free end portion 8 (see FIG. 1B) in which a leaf spring material having a constant width is bent into an S shape and contacts the rolling element 6, and an intermediate portion. 9 and a fixed end 10 that contacts the inner surface of the end of the pocket 3 are formed. A free end side bending portion 11 that folds one end portion of the free end portion 8 and reaches one end of the intermediate portion 9 and a fixed end side bending portion that folds the other end portion of the intermediate portion 9 and reaches one end of the fixed end portion. 12 is bent into an S shape.

  The biasing spring 7 is accommodated in such a posture that the free end side curved portion 11 faces the bottom surface side of the pocket 3 and the fixed end side curved portion 12 faces the open side of the pocket 3.

  The operation of the torque limiter 20 having the above configuration is the same as that described above with reference to FIG.

  In addition, if the spring constant of the urging spring 7 is set to be relatively small, it can be used as a one-way clutch in the same manner as described above.

  In the second embodiment shown in FIG. 6 to FIG. 8, the sprocket 21 and the ratchet 22 are provided on the external member 2 of the torque transmission unit described above with reference to FIG. Depending on the selection, it can be used as a one-way clutch type torque limiter 20 or a one-way clutch.

  The third embodiment shown in FIGS. 9 to 11 relates to a one-way intermittent feed unit using the torque limiter 20 of the first embodiment (see FIGS. 3 to 5). Since the torque limiter 20 is the same as that of the first embodiment, the description thereof is omitted.

  The one-way intermittent feeding unit includes the torque limiter 20, a swing member 26 having a feeding claw 27, and a frame 28 that supports them.

  The torque limiter 20 is housed in a concave portion 29 provided on the plate surface of the frame 28, and is fixed to the bearing convex portion 25 of the internal member 1 to the disc portion 31 of the swing member 26 and the shaft hole 24 of the internal member 1. The screw shaft 32 is inserted and fixed on the back surface of the frame 28 with a nut 33. The fixing screw shaft 32 has a collar-shaped head portion 34, thereby preventing the disc portion 31 and the internal member 1 from coming off. In addition, a detent pin 35 that reaches the recess 29 is inserted into the internal member 1.

  A feed claw 27 is rotatably attached to the inner surface of the disk portion 31 by a shaft 36, and the feed claw 27 is engaged with the ratchet 22 while being urged by a biasing spring 37 (see FIG. 9). .

  The frame 28 is provided with a guide groove 38 at the upper end edge, and the transport tape 39 drawn out to the guide groove 38 is engaged with the sprocket 21 partially exposed in the guide groove 38.

  In the one-way intermittent feed unit of the third embodiment configured as described above, when the swinging member 26 is swung in the direction of arrow a in FIG. The feed tape 39 is fed by one pitch. At this time, the torque limiter 20 idles and gives a predetermined idling torque to the feeding of the transport tape 39. When the oscillating member 26 is oscillated in the direction of arrow b, the feeding claw 27 returns to its original state. At this time, the torque limiter 20 is locked to prevent the reverse rotation of the sprocket 21.

  In addition, although illustration is abbreviate | omitted, the one-way intermittent feed unit using the torque limiter of the said Example 2 can also be comprised similarly.

(A) Front view of torque transmission unit of the present invention, (b) Partial enlarged sectional view of the same, (c) Enlarged perspective view of the urging spring of the same, (d) Partial enlarged sectional view of the comparative example. (A) Front view of another torque transmission unit of the present invention, (b) Partial enlarged sectional view of the same Front view of Example 1 Sectional view of the II line of FIG. Exploded perspective view of Example 1 Front view of Example 2 Sectional view taken along line II-II in FIG. Exploded perspective view of Example 2 Longitudinal front view of Example 3 Sectional view along line III-III in FIG. Exploded perspective view of Example 3 (A) Front view showing a part of a conventional example, (b) Sectional view taken along line IV-IV in (a) Plan view when assembling the conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Internal member 2 External member 3 Pocket 4 Cam surface 5 Wedge part 6 Rolling body 7 Energizing spring 8 Free end part 9 Intermediate part 10 Fixed end part 11 Free end side curved part 12 Fixed end side curved part 13 Base 14 Jig 15 Fixing pin 16 Conveying tape 20 Torque limiter 21 Sprocket 22 Ratchet 23 Boss part 24 Shaft hole 25 Bearing convex part 26 Oscillating member 27 Feeding claw 28 Frame 29 Recessed part 31 Disk part 32 Fixed screw shaft 33 Nut 34 Head 35 Anti-rotation Pin 36 Shaft 37 Biasing spring 38 Guide groove 39 Conveying tape

Claims (3)

A plurality of pockets (3) are formed on the fitting surface of one of the inner member (1) and the outer member (2), which are fitted so as to be rotatable relative to each other, at a predetermined interval in the circumferential direction. (3) is a cam surface (4) in which both end surfaces in the axial direction are opened to both end surfaces of the internal member (1) or the external member (2), and the bottom surface of each pocket (3) is inclined in a constant circumferential direction. ) Is formed, and a wedge part (5) is formed between the cam surface (4) and the other member facing, and a rolling element (6) is interposed in the wedge part (5) and the rolling element A biasing spring (7) for biasing (6) in the narrow direction of the wedge portion (5) is housed between the enlarged side end portion of the wedge portion (5) and the inner end surface of the pocket (3). In the one-way torque transmission unit,
The biasing spring (7) bends a leaf spring material having a constant width into an S-shape and comes into contact with the rolling element (6), an intermediate portion (9), and a pocket (3). A fixed end (10) that is in contact with the inner end surface, and a free end-side curved portion (11) that folds one end of the free end (8) and reaches one end of the intermediate portion (9); The other end portion of the intermediate portion (9) is folded back and bent into an S shape including a fixed end side curved portion (12) reaching one end of the fixed end portion (10), and the biasing spring (7 ) With the free end side curved portion (11) facing the bottom surface side of the pocket (3) and the fixed end side curved portion (12) facing the open side of the pocket (3). One-way torque transmission unit featuring.   The sprocket (21) and the ratchet (22) are provided coaxially on a member other than the member provided with the pocket (3) among the inner member (1) and the outer member (2). Item 2. The one-way torque transmission unit according to item 1.   It comprises a one-way clutch type torque limiter (20), a swinging member (26) having a feed claw (27), and a frame (28) that supports them in a coaxial state, and the swinging member (26) is the torque. In the one-way intermittent feed unit that is swingably attached to the internal member (1) of the limiter (20), the torque transmission unit according to claim 2 is used as the one-way clutch type torque limiter (20). The one-way intermittent feed unit, wherein the feed pawl (27) of the swing member (26) is engaged with the ratchet (22) of the torque transmission unit in the feed direction of the ratchet (22). .

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