JPH0752431Y2 - One way clutch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a one-way clutch that transmits a relatively small rotational force only in one direction.

(Prior Art) A one-way clutch unit in which a clutch mechanism is embedded in external parts such as resin-molded gears and pulleys, that is, a one-way clutch that transmits a relatively small rotational force in only one direction, has a compact and lightweight structure. Since it is possible to reduce the cost and the like, demand has been rapidly increasing for the past several years as a paper feeding device unit, a drive unit, a speed change mechanism unit, etc. in a copying machine, a facsimile, a printer or the like.

There are various types of one-way clutches of this type. Among them, as shown in FIGS. 5 and 6, the operation is most reliable and the cost can be easily reduced. , The drive shaft 101 has a gear-shaped outer peripheral surface 111
The inner ring body 110 is fixed with screws 119, and the outer ring body 120 such as a paper feed roller rotatably fitted around the outer ring body 120.
Has a wall surface that is inclined with respect to the radial direction of the inner ring body 110 but is parallel to the axis of the inner ring body 110, and an opening 126 is formed on one side surface of the outer ring body 120. A locking piece holding groove having an opening 127 on the surface of the inner ring body 110 facing the uneven surface 111.
125 is provided, and the tip of the groove 125 is the uneven surface 111.
One piece 1 for locking, which is an end surface 134 for abutting against one slope of
The rear end side of 32 is bent in a U shape so as to internally mount the locking piece 130 formed as the elastic piece 137, and by the elastic piece 137, the abutting end surface 134 of the locking piece 132. Is always the uneven surface 11
There is a one-way clutch that is biased to hit one slope of 1.

However, in the case of the above type, the inner ring 110
Since there is a limit to reducing the unevenness of the gear-like uneven surface 111 formed on the outer peripheral surface of the outer peripheral surface of Fig. 6, when the rotational force is transmitted to the outer ring body 120 shown in Fig. 6B, As is apparent from the time when the outer ring body 120 idles with respect to the inner ring body 110 shown in (b), a considerable backlash occurs between the two ring bodies, and it is used for equipment requiring high-precision operation. Not only had some suspicions, but during this slip,
It also had the drawback of producing an impulsive sound that made the user think that it was a malfunction, but this was indispensable.

(Problems to be solved by the invention) Therefore, although not shown, a plurality of ratchet pawls corresponding to the inner ring body 110 having the uneven surface 111 and the outer ring body corresponding to each ratchet pawl wheel are provided. 120 locking pieces 1
By preparing ratchet claws equivalent to 30, and integrating each ratchet claw wheel by shifting the phase of the ratchet claws in the circumferential direction to the claws, and making the ratchet claws of each ratchet claw independently slide contact with each other. , A one-way clutch was developed that was able to solve the problem of chipping of the locking end of each ratchet pawl that tends to occur when the clutch is mis-engaged, but the impulsive sound generated when idling was caught by the existing concept. , Still remained.

The present invention is a further improvement of the above-mentioned technique, in which the engagement of each locking piece is likely to occur when the uneven surface provided on the inner ring body of the one-way clutch and the locking piece provided on the outer ring body are misaligned. It is an object of the present invention to provide a one-way clutch that can reduce the torque of each locking piece during idling and reduce the impact noise together with the problem of chipping at the toe.

(Means for Solving the Problems) In order to achieve the above object, the one-way clutch of the present invention has an outer ring body rotatably arranged on the outer periphery of an inner ring body, and the outer ring body of the two ring bodies is opposed to each other. One of the surfaces has a groove-like concave and convex surface in which the groove portion is parallel to the axis of the inner ring body, and the ring body having the other surface opposite to the one surface has a radiation of the inner ring body. Although it is inclined with respect to the direction, it has a wall surface that is parallel to the axis of the inner ring body and is provided with a locking piece holding groove that opens to the other surface, and the groove has a rear end. Part is bent so as to come into contact with the innermost wall surface of the groove, and has different lengths projecting from the opening of the groove, and different locking ends of the tips are provided for each of the slopes of one of the uneven surface. Of the locking pieces that are slightly thicker and arranged side by side, and the locking pieces of the separate body The rear end side is separately fixed to the rear part, and the front end side elastically contacts one wall surface of the groove, and the locking end sides of the locking pieces arranged side by side in the concave and convex direction respectively. It is made thinner to weaken the biasing force, and at the same time, a locking piece made up of a separate elastic piece is incorporated.

(Operation) That is, since the one-way clutch according to the present invention is configured as described above, one of the inner ring body and the outer ring body is locked to one slope of the gear-like uneven surface. If the locking end of one piece is rotated in the abutting direction, both wheels will rotate together, and when one of the wheels is rotated in the opposite direction, the other wheel will idle. Rotational force is not transmitted.

Then, as described above, the transmission of the rotational force from the one wheel body to the other wheel body is incorporated in the one slope of the uneven surface of the one wheel body and the locking piece holding groove of the other wheel body. It is carried out by abutting with the locking end of each other locking piece, but since the timing of the abutting of each of the other locking ends is different for each slope of the uneven surface, The play, or backlash, between when one locking end hits one slope of the uneven surface and when the other locking end comes to hit, backlash is the locking of the only locking piece. As a result, the rotational force from one wheel to the other wheel can be significantly reduced compared to the case where the torque from one wheel is transmitted to the other wheel at the end. It is possible to reduce the transmission operation error.

In addition to this, in the one-way clutch according to the present invention, the locking piece portion for forming the locking piece is made slightly thicker in order to increase its strength, while the locking end side of this locking piece portion is The elastic piece that urges in the direction of the uneven surface is made thinner to weaken the urging force, and the locking end of the locking piece that tends to occur when the clutch is mis-engaged. It is possible to prevent chipping, reduce the torque of the locking piece when the wheel is idling, and reduce the impact sound, which has been indispensable, to the extent that it does not interfere.

(Embodiment) Hereinafter, an embodiment of the one-way clutch according to the present invention will be described in detail with reference to the drawings.

First, in FIGS. 1 to 4 showing only the main part of the embodiment of the present invention, 1 is a drive shaft, 10 is an inner ring body, 20 is an outer ring body such as a gear, a pulley or a roller, 30
Is a locking piece.

The inner ring 10 is made of synthetic resin, metal, or the like, and a part of the outer periphery of the inner ring is a gear-shaped uneven surface 11, which is fixed to the drive shaft 1 by a screw 19.
By the way, it is desirable that the pitch of the unevenness forming the uneven surface 11 be as small as possible by ensuring the contact with the locking piece 30 described later and reducing the play.

The outer ring 20 is made of synthetic resin, metal, or the like, like the inner ring 10, and the drive shaft 1 is concentrically fitted in the central portion of the inner ring 10 to be rotatably supported by the drive shaft 1. The drive shaft fitting hole 21 for tightening, the enlarged diameter portion 22 for forming the facing surface 23 that faces the uneven surface 11, and although inclined with respect to the radial direction of the inner ring body 10, the axial center of the inner ring body 10. An opening 26 is formed on one side surface of the locking piece holding groove 25 having parallel wall surfaces and an opening 27 on the facing surface 23, and one wall surface facing each other forming the groove 25. Tip projection elastic wall 2 for elastically contacting the tips of the elastic piece portions 37, 38 that form the locking piece 30 described later.
Equipped with 8 etc., 29 is a washer for holding the outer ring body in place.

Further, the outer ring body 20 is fitted and fixed in the locking piece holding groove 25, the abutting end surfaces 34, 35 described later project from the opening 27 of the groove 25, and one of the uneven surface 11 of the inner ring body 10 is projected. The engaging piece 30 having a slightly different timing for hitting each slope of FIG. 3 has its rear end formed on the outer ring body 20 as shown in FIG. The abutting end faces 34, 35 of the tip, which are bent so as to come into contact with the innermost wall surface of the locking piece holding groove 25 and serve as a locking end, are provided for each one of the slopes of the uneven surface 11 of the inner ring body 10. Engaging pieces 32, 33 that are separate and slightly thicker and have different thicknesses so that they strike at slightly different times.
And the rear end sides of the separate locking pieces 32 and 33 are fixed by adhesion, fusion, etc., and the front end sides are for elastic contact with the front end formed on one wall surface of the groove 25. An elastic piece portion 3 thinned to weaken the urging force that elastically contacts the projecting wall 28 and urges the abutting end surfaces 34, 35 toward the uneven surface 11.
It consists of 7,38.

As described above, the one-way clutch of the present invention is provided with the outer ring body 20 having the gear-shaped concavo-convex surface 11 on the outer peripheral surface thereof and rotatably arranged on the outer periphery of the inner ring body 10 fixed to the drive shaft 1. The stop piece holding groove 25 has a separate end face for abutment that serves as a locking end of the tip.
Locking piece portions 32, 33 at different timings at which each of the slopes 34, 35 of the uneven surface 11 of the inner ring body 10 strikes, and the abutting end surfaces 34, 35 side serving as a locking end. The elastic piece 37,3 thinned to weaken the urging force that urges the
Since the locking piece 30 formed by 8 and 8 is configured by being fixed in the interior, the outer ring body 20 is now fixed and the inner ring body 10 together with the drive shaft 1 is indicated by the arrow B in FIG. Direction, that is, the direction of arrow B also shown in FIG. 4, or the inner ring body 10 is fixed together with the drive shaft 1 and the outer ring body 20 is shown in the direction of arrow B ′ in FIG. 2, that is, also in FIG. When it is rotated in the direction of arrow B'shown, either the inner ring body 10 or the outer ring body 20 idles, and as shown in FIG. Department
As shown in FIG. 4 [B] when 33 crosses one convex portion of the uneven surface 11 and then the locking piece portion 32, as shown in FIG. 4 when the idle rotation is stopped. It will be in one of the states.

If the inner ring 10 is rotated together with the drive shaft 1 in the direction of arrow A in FIG. 2, that is, in the direction of arrow A also shown in FIG. 4, the rotational force is shown in FIG. It is transmitted to the outer ring body 20 in the closed state or in the state shown in [b] of FIG.

At this time, as is clear from the above description, backlash, that is, play between the inner ring body 10 and the outer ring body 20 is reduced. Therefore, it is natural that the rotational force is transmitted with extremely high accuracy. In the one-way clutch of the present invention, the locking pieces 32, 33 for constructing the locking piece 30 are made slightly thicker in order to increase the strength, while the locking ends of the locking pieces 32, 33 are formed. The resilient piece portions 37, 38 for urging the end faces 34, 35 for impact that are the direction of the uneven surface 11 of the inner ring body 10 have a thin clutch to reduce the urging force. It is possible to prevent chipping of the abutting end faces 34, 35 that are the locking ends of the locking pieces 32, 33 that tend to occur when the engagement of the
During idling, the torque of the locking pieces 32, 33 can be reduced to reduce the impact sound, which has been indispensable, to the extent that it does not hinder.

Therefore, in each one-way clutch of this embodiment, the one-way clutch is incorporated as an intermediate member of the rotational force transmission mechanism, or only one of the inner ring body and the outer ring body thereof is used for the rotational force transmission side or the rotational force transmission side of the rotational force transmission mechanism. If the outer ring is used as a paper feed roller in a copying machine, a facsimile machine, a printer, etc., in addition to the force receiving side,
This makes it possible to perform extremely accurate paper feeding operation.

(Effect of the Invention) As is apparent from the above description, according to the present invention, the backlash, that is, the play is reduced as compared with the conventional one-way clutch of this type that uses the locking piece for transmitting the rotational force. Not only it has become possible to provide a highly accurate one-way clutch with few operating errors, but it is also the end face for hitting that is the locking end of the locking piece that tends to occur when the clutch is mis-engaged. It is possible to prevent the chipping of No. 1 and reduce the torque of the locking piece during idling, and to reduce the impact sound that has been indispensable until now to the extent that it does not hinder.

[Brief description of drawings]

1 to 4 mainly show the main parts of the configuration of an embodiment of the one-way clutch according to the present invention, and FIG. 1 shows only the outer ring body thereof along the line I--I in FIG. 2 is a front view, FIG. 2 is a front view, FIG. 3 is an enlarged perspective view of only the locking piece thereof, and FIG. 4 [a] and [b] are the operation of the locking piece. FIG. 5 is an enlarged view for explaining the mode, and FIG. 5 and FIG. 6 mainly show the configuration of a conventional one-way clutch of the same kind as the one-way clutch according to the present invention, and FIG. Is a side view shown in the same manner as in FIG. 1, and FIGS. 6A and 6B are enlarged views for explaining the operation mode of the locking piece. 1,101; Drive shaft 10,110; Inner ring body 11,111; Concavo-convex surface 19,119; Screw 20,120; Outer ring body 21,121; Drive shaft fitting hole 22,122; Expanded portion 23,123; Opposing surface 25,125; Locking piece retaining groove 26,27,126,127; Opening 28; Tip Parting wall for projecting contact 128; Projecting wall for rear end engaging part 29,129; Washer 30,130; Locking piece 32,33,132; Locking piece 34,35,134; Hitting end face 37,38,137; Stripping piece 139 ; Grip pieces A, B, B '; Arrows indicating the direction of rotation

Claims (4)

[Scope of utility model registration request] 1. An outer ring body is rotatably arranged on the outer periphery of an inner ring body, and one of the surfaces of the two ring bodies facing each other is
A groove having a groove-like concave and convex surface parallel to the axis of the inner ring body and having the other surface opposite to the one surface is inclined with respect to the radial direction of the inner ring body. Also has a wall surface parallel to the axis of the inner ring body, and is provided with a locking piece holding groove opened on the other surface, and the groove is
The rear end is bent so as to contact the innermost wall surface of the groove,
Further, the lengths of the grooves protruding from the openings are different, and the different locking ends of the tips are slightly different from each other so that the respective slanting surfaces of the uneven surface hit each other at different times. The thicker side-by-side locking pieces and the rear side of each of the separate locking pieces are separately fixed to the rear end side, and the tip side elastically contacts one wall surface of the groove, Each of the locking pieces arranged side by side is thinned so as to weaken the force for biasing the respective locking end sides individually in the direction of protrusions and depressions, and at the same time, it is made of a separate elastic piece. A one-way clutch featuring a locking piece inside. 2. The one-way clutch according to claim 1, which is incorporated as an intermediate member of a rotational force transmission mechanism. 3. The one-way clutch according to claim 1, wherein one of the inner ring body and the outer ring body serves as a rotational force transmitting side or a rotational force receiving side of the rotational force transmitting mechanism. 4. The one-way clutch according to claim 1, wherein the outer ring member is a paper feed roller in a copying machine, a facsimile, a printer or the like.