JP2004316891A - Rotationally operated one-way clutch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotationally operated one-way clutch capable of being designed with a less number of parts, low costs, a small spring constant and saved space by constructing an energizing spring to directly energize a roller. <P>SOLUTION: The rotationally operated one-way clutch 1 comprises an outer ring 3 having an inner periphery cylindrical face, an inner ring 2 having a cam face 12, a roller 7 for transmitting torque between the outer and inner rings, an energizing spring 5 for energizing the roller, and a weight 8 for receiving centrifugal force to thrust the roller in the direction of engagement while resisting against the energizing force of the energizing spring. Herein, the energizing spring 5 directly energizes the roller 7. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rotation-actuated one-way clutch used for motorcycles, snowmobiles, and the like, and which exhibits a function of a one-way clutch only after a predetermined number of rotations or more.

  In general, a one-way clutch has an outer ring and an inner ring that rotate relative to each other, and a sprag or a roller that transmits torque between the outer ring and the inner ring meshes with a cam surface provided on a raceway surface of the outer ring or the inner ring, so that a one-way clutch is provided. Only the rotational torque is transmitted. In addition, it is configured to idle in the reverse direction.

  In such a one-way clutch, a roller is disposed in a pocket (recess) provided in the inner ring or the outer ring, and the rotation is locked by a wedge action in which the roller is engaged with a wedge portion of the pocket depending on the rotation direction. Are known.

  Further, in Patent Document 1, a roller and an auxiliary roller are arranged between an outer ring (outer race) and an input coupling, and when the rotation speed exceeds a predetermined number of rotations, the auxiliary roller can engage the roller with a cam surface by centrifugal force. To a suitable position. This configuration discloses a configuration in which the roller and the outer inner ring can be locked by this pressing force, and when the outer and inner rings attempt to rotate relative to each other in the meshing direction, the rotation is locked by a wedge action.

  For example, in Patent Literature 2, when a roller is disposed in a recess provided in an outer ring (outer race) and the outer ring rotates clockwise, the roller is locked in the recess by wedge action, and the outer ring is A configuration for locking rotation is disclosed.

Prior art document information related to the invention of this application includes the following.
JP-A-52-100045 (pages 2-3, FIG. 3, etc.) JP-B-53-8019 (page 1-2, Fig. 1 etc.)

  However, for example, the one described in Patent Document 1 requires components such as a plate and a holding piece for pressing the roller, and requires a space for installing a spring. is there.

  Furthermore, although a coil spring is provided as a spring for urging the roller, it is difficult to set a small spring constant in a limited space with the coil spring, and in that case, the price is slightly higher (compared to the accordion spring). ).

  SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotation-actuated one-way clutch having a structure capable of reducing the number of parts, being inexpensive, having a small spring constant and being designed in a space-saving manner.

  For example, since the urging spring is configured to directly urge the rolling element, the number of parts is reduced, and a rotation-operating one-way clutch is provided that is inexpensive, has a low spring constant, and can be designed in a small space. can do.

  An outer ring having an inner peripheral cylindrical surface, an inner ring having a cam surface, a rolling element for transmitting torque between the outer and inner rings, an urging spring for urging the rolling element, and an urging spring receiving centrifugal force. In a rotation type one-way clutch provided with a weight that presses the rolling element in the engaging direction while resisting the urging force, the urging spring is configured to directly urge the rolling element.

  In the present specification, the “rotationally actuated type” means that the function as a one-way clutch reliably operates during rotation in a range exceeding the above-mentioned predetermined number of rotations. Even if the rotation speed is lower than the rotation speed, the motor may function as a one-way clutch.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same parts are denoted by the same reference numerals.

    FIG. 1 is a front view of a rotation-actuated one-way clutch showing one embodiment of the present invention, and FIG. 2 is an axial sectional view taken along line AA of FIG. The rotation-operating one-way clutch 1 has an inner ring 2 which is a hollow shaft fitted with a drive shaft (not shown), a spline 2a being engraved on the inner periphery, and a coaxial shaft radially outside the inner ring 2 and having an inner ring. 2 and an outer ring 3 arranged to be relatively rotatable.

  A substantially cylindrical rolling element, that is, a roller 7 and a substantially cylindrical weight body 8 are disposed between the outer ring 3 and the inner ring 2. Further, an urging spring 5 is provided so as to press the roller 7. Further, the roller 7 is directly urged toward the direction where the distance between the cam surface 12 (FIG. 3) and the cylindrical inner peripheral surface 3a of the outer race 3 is wide, that is, in the non-engagement direction in which the one-way clutch 1 idles. A bias spring 5 is provided.

  A side plate 4 is provided between the outer ring 3 and the inner ring 2 to hold the urging spring 5, the roller 7, and the weight body 8 so as not to fall off in the axial direction. As shown in FIG. 2, the side plate 4 includes a first portion 4 a that substantially covers the biasing spring 5, the roller 7, and the weight 8 in the radial direction, and an annular second portion 4 b disposed at one end in the axial direction. Thus, the first portion 4a and the second portion 4b are joined by caulking or the like, and are integrated. In this caulking, the tip of the column portion 13 bent in the axial direction is bent from one side plate, and the opposite side plate is sandwiched together with the other portions of the column portion.

  The side plate 4 has an engagement tongue piece 10 on the radially inner diameter side, and the engagement tongue piece 10 fits into a concave portion 11 provided on the inner periphery of the inner ring 2 to be fixed to the inner ring. Is held. The outer ring 3 is attached with a predetermined clearance.

  As shown in FIG. 1, a plurality of long holes 6 are provided in an annular portion in the axial direction of the first portion 4 a of the side plate 4, and a plurality of long holes 6 are provided in the long holes 6. (See FIGS. 3 and 4). The outer peripheral surface (supported portion 23 <see FIGS. 7 and 8>) of the first cylindrical portion 21 of the weight 8 is supported by the inner periphery of the elongated hole 6 and is movable within the longitudinal length range of the elongated hole 6. Installed in state. The long hole 6 is also provided in the second portion of the side plate 4 at a position corresponding to the first portion.

  In this specification, the term "side plate" means a structure that can support the rolling element and the weight only from the side in the axial direction and cannot prevent the rolling element and the weight from falling off unless assembled to the outer ring.

  Next, the operation of the rotation actuated one-way clutch 1 of the present invention will be described with reference to FIGS. As is clear from FIG. 3, the urging spring 5 is attached to the column 13, and urges the roller 7 in the direction in which the cam surface 11 is deep (non-engagement direction).

  FIG. 3 shows a state where the inner race 2 is not rotating or rotating at a low speed. At this time, since the roller 7 is pressed by the urging spring 5 and is at a deep position on the cam surface 11, a gap exists between the roller 7 and the outer ring 3 at a portion indicated by B. Therefore, the outer ring 3 is in a state in which the outer ring 3 can idle in both directions with respect to the inner ring 2.

  On the other hand, FIG. 4 shows a state during normal rotation. At this time, the centrifugal force acts on the weight 8, and the weight 8 presses the roller 7 toward a shallow position (engagement position) of the cam surface 11, that is, toward the non-wedge action surface 16. Then, there is no gap in the portion indicated by C between the roller 7 and the outer ring 3, and the urging spring 5 is in a state of being compressed by the centrifugal force of the weight body 8. Accordingly, at this time, the function as the rotary operation type one-way clutch 1 is exhibited, and when the outer wheel 3 tries to rotate to the right relative to the inner wheel 2 in the figure, the gap between the outer and inner wheels is locked by the torque transmission of the roller 7. On the other hand, if you try to turn to the left, it will idle. In either of the states shown in FIGS. 3 and 4, the urging spring 5 directly applies the urging force to the roller 7.

  An accordion spring is used as the biasing spring 5, and as shown in detail in FIG. 5, the biasing spring 5 is held by sandwiching the column portion 13 of the side plate 4 between the mounting portions 14 of the biasing spring 5. 4 attached. One end of the biasing spring 5 on the side opposite to the mounting portion 15 serves as a pressing portion 17 for pressing the roller 7. Note that a coil spring or the like can be used as the biasing spring 5, but it is difficult to set a small spring constant in a limited space with the coil spring, and it is more expensive than an accordion spring or the like. Therefore, it is preferable to use an accordion spring.

  FIG. 6 is a front view showing the biasing spring 5 (accordion spring) attached to the side plate 4. The accordion spring 5 is more firmly fixed by engaging the locking piece 15 formed by cutting out the mounting portion 15 with the hole 18.

  Next, details of the weight 8 used in the embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a front view of the weight 8, and FIG. 8 is a top view of the weight 8. The weight 8 is composed of two substantially cylindrical portions. It comprises a small-diameter first cylindrical portion 21 and a large-diameter second cylindrical portion 22 provided integrally.

  The first cylindrical portion 21 is shorter than the second cylindrical portion 22, and a supported portion 23 having a predetermined length is formed on both axial sides of the second cylindrical portion 22. The supported portion 23 is supported by long holes 6 provided on both sides of the side plate 4 in the axial direction. That is, when the supported part 23 moves in the long hole 6, the weight 8 moves.

  The outer peripheral surface of the large-diameter second cylindrical portion 22 contacts the roller 7 and presses the roller 7. Although the first cylindrical portion 21 is a solid member, it may be a hollow member.

  It is conceivable that the weight body 8 is formed from a material such as steel, copper, steel alloy, aluminum, or a synthetic resin. However, if a material having a large specific gravity such as steel is used, the centrifugal force applied per unit volume increases. The size of the device is small and a state in which the device can be engaged even at low speed rotation is obtained, and the diameter of the weight 8 can be reduced.

  In each of the embodiments described above, a cylindrical roller is shown as a rolling element disposed in a pocket, but this may be a spherical body.

  The present invention can also be used for vehicles other than motorcycles and snowmobiles, ie, four-wheel vehicles.

It is a front view of a rotation operation type one-way clutch of one example of the present invention. It is AA sectional drawing of FIG. It is the enlarged view which showed the operation | movement of the weight body and the roller at the time of non-rotation. It is the enlarged view which showed the operation | movement of the weight body and the roller at the time of rotation. It is a top view which shows the state of the urging spring and its attachment. It is a front view which shows the state of the urging spring and its attachment. It is a front view of a weight. It is a top view of a weight.

Explanation of reference numerals

DESCRIPTION OF REFERENCE NUMERALS 1 rotation-operated one-way clutch 2 inner ring 3 outer ring 5 biasing spring 7 roller 8 weight 11 cam surface

Claims (6)

An outer ring having an inner peripheral cylindrical surface, an inner ring having a cam surface formed thereon, a rolling element for transmitting torque between the outer and inner rings, an urging spring for urging the rolling element, and the urging force by receiving centrifugal force In a rotary operation type one-way clutch including a weight that presses the rolling element in an engagement direction while resisting the urging force of a spring,
A rotation-operating one-way clutch, wherein the biasing spring directly biases the rolling element.   An outer ring having an inner peripheral cylindrical surface, an inner ring having a cam surface formed thereon, a rolling element for transmitting torque between the outer and inner rings, an urging spring for urging the rolling element, and the urging force by receiving centrifugal force A rotary actuated one-way clutch including a weight that presses the rolling element in the engaging direction while resisting the urging force of a spring, wherein a side plate that regulates axial movement of the rolling element and the weight is provided. The rotation actuated one-way clutch according to claim 1, wherein   The rotation-operated one-way clutch according to claim 2, wherein the biasing spring is mounted on the side plate.   The rotation-operated one-way clutch according to claim 3, wherein a column portion extending in the axial direction is formed on the side plate, and the urging spring is mounted on the column portion.   5. The one-way clutch according to claim 1, wherein the biasing spring is an accordion spring. The rotary operation type one-way clutch according to any one of claims 2 to 5, wherein the side plate has an elongated hole for guiding operation of the weight body.

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