JP2534150Y2 - One-way clutch - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The one-way clutch according to the invention is used by being incorporated in a paper feed mechanism of office equipment such as a copying machine, a facsimile, and a printer.

(Prior Art) The paper feed mechanism of office equipment incorporates a one-way clutch as shown in FIG. 25 to feed paper one sheet at a time. The one-way clutch includes an inner race 1 and an outer race 2, which are arranged concentrically with each other, a plurality of sprags 3, 3, and the sprags 3, 3 in the same rotational direction (counterclockwise in FIG. 25).
And a pair of cages 5 and 6 provided concentrically with each other to hold the plurality of sprags 3 and 3 at equal intervals.

The plurality of sprags 3 have a length a larger than a diameter r of a gap 8 existing between the outer peripheral surface of the inner ring 1 and the inner peripheral surface of the outer ring 2 and extend in the diametric direction. It has a specially shaped piece having a width dimension b smaller than the dimension r. Then, as long as no external force acts, the respective elastic ends of the leaf springs 4 elastically press the respective outer ends against the inner peripheral surface of the outer race 2 and the respective inner ends against the outer peripheral surface of the inner race 1.

The one-way clutch configured as described above operates as follows. First, in FIG. 25, when the outer ring 2 is to be rotated clockwise or the inner ring 1 is to be rotated counterclockwise, the sprags 3, 3 are connected to both inner and outer ends and the outer peripheral surface of the inner ring 1 or Due to the frictional force acting between the inner peripheral surface of the outer ring 2 and the
As shown in FIG. 26, there is a tendency to rotate clockwise against the elasticity of the leaf spring 4. The frictional force acting between the inner and outer ends of each sprag 3, 3 and the outer peripheral surface of the inner race 1 or the inner peripheral surface of the outer race 2 is reduced. As a result, the relative rotation between the outer ring 2 and the inner ring 1 becomes free.

Conversely, in FIG. 25, the outer ring 2 is turned counterclockwise or
When each of the sprags 3 and 3 is to be rotated clockwise, the sprags 3 and 3 are separated by the frictional force acting between the inner and outer ends and the outer peripheral surface of the inner ring 1 or the inner peripheral surface of the outer ring 2 as shown in FIG. As shown in FIG. And
Both inner and outer ends of the sprags 3 and 3 bite into the outer peripheral surface of the inner ring 1 or the inner peripheral surface of the outer ring 2. As a result, relative rotation between the outer race 2 and the inner race 1 becomes impossible.

(Problems to be solved by the invention) However, in the case of the conventional one-way clutch configured and operated as described above, the number of components is large, and component processing, component management, and assembly work are troublesome, and the production cost is increased. Inevitable. The one-way clutch of the present invention solves such a disadvantage.

(Means for Solving the Problems) The one-way clutch of the present invention is, like the conventional one-way clutch described above, an inner ring and an outer ring arranged concentrically with each other, and the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring. And a plurality of irregularly shaped pieces having a length dimension larger than the diameter dimension of the gap existing therebetween and a width dimension smaller than the diameter dimension thereof, and arranged in the gap. It comprises sprags and an elastic member provided in the gap and for urging each sprag in the same rotational direction.

In particular, in the one-way clutch of the present invention, the plurality of sprags are made of metal, and the elastic member is made of synthetic resin or elastomer, and has a shape of an annular ring extending over the entire circumference of the gap. ing. The plurality of sprags are inserted into a part of the elastic member and are integrally connected to the elastic member.

(Operation) The operation itself when the one-way clutch of the present invention configured as described above transmits rotational motion in only one direction is the same as that of the above-described conventional one-way clutch.

In particular, the one-way clutch of the present invention has few constituent parts, and the work of parts processing, parts management and assembly is easy,
Production costs can be reduced.

Further, since the sprag itself is made of metal, the wear resistance of the sprag can be sufficiently ensured. Moreover, since the elastic member is made by injection molding of synthetic resin or elastomer,
It is also easy to insert the sprag into a part of the elastic member and integrally connect the elastic member and the sprag.

(Embodiment) FIGS. 1 to 18 show a first embodiment of the present invention. Twelfth
In the drawing, 2 is an outer ring, and 7 is a shaft arranged concentrically with the outer ring 2 in place of the inner ring 1 in the conventional structure shown in FIGS. A cylindrical gap 8 is provided between the inner peripheral surface of the outer ring 2 and the outer peripheral surface of the shaft 7, and a sprag ring 9 is mounted in the gap 8. This sprag ring 9
Comprises a plurality of sprags 3, 3 each made of metal;
An elastic member having a plurality of sprags 3, 3 inserted in a part thereof.

Among these, the elastic member is made by injection molding a synthetic resin or an elastomer, and the same number of the sprags 3, 3 as those described above, and connecting portions 10, 10 thinner than the sprags 3, 3, and One end of each connecting portion 10, 10 (second
And a ring portion 11 connected to the right end of FIG. 12).

On the other hand, each of the sprags 3, 3 is made of a metal material.
It is formed in a shape as shown in the figure. Each sprag 3, 3 having such a shape, when injection-molding an elastic member composed of the ring portion 11 and the connecting portions 10, 10 with a synthetic resin or an elastomer, as shown in FIG. Inserted at the end of each of the above-mentioned connecting portions 10 and 10, connecting portions 10 and 10
And the sprags 3, 3 are integrally connected.

The plurality of sprags 3 constituting such a sprag ring 9 are similar to the conventional one-way clutch described above, and are similar to the fourteenth clutch.
As shown in the drawing, the gap 8 has an irregularly shaped piece having a length dimension a larger than the diameter dimension r in the diameter direction and a width dimension b smaller than the dimension r in the diameter direction.
The connecting portions 10, 10 for connecting the sprags 3, 3 with the ring portion 11 are configured to function as a kind of torsion bar which is elastically deformable in the torsional direction.

On the other hand, the outer ring 2 for incorporating the sprag ring 9 as described above is formed by forming a pair of inward flange portions 13 and 14 on the inner peripheral edges of both ends of the cylindrical portion 12 as shown in FIGS. The cross-sectional shape is a U-shape whose inner peripheral side is open. The outer ring 2 has a function as a radial bearing by sliding the inner peripheral edges of the inward flange portions 13 and 14 against the outer peripheral surface of the shaft 7.

Further, cutouts 15, 15 through which the plurality of sprags 3, 3 constituting the sprag ring 9 can pass, are formed in one of the inward flange portions 14 (rightward in FIGS. 8 to 9), and the outer ring 2 is formed.
The sprags 3, 3 can be inserted inside the outer race 2 along with the assembling work of the sprag ring 9 with the sprags 9.

Further, a recessed groove 16 in which the ring portion 11 of the sprag ring 9 can be fitted is formed over the entire circumference in a portion of the one inward flange portion 14 near the outer periphery of the outer surface. When the outer race 2 and the sprag ring 9 are combined with each other, the ring portion 11 can be connected to the inward flange portion 14 by the concave groove 16.
So that it does not protrude from the outside surface of the.

The sprag ring 9 configured as described above and the outer ring 2 configured as described above are combined as shown in FIGS. That is, the plurality of sprags 3 constituting the sprag ring 9 are formed inside the outer ring 2 by the pair of inward flange portions.
Between 13 and 14, cut out the connecting parts 10, 10 between 15, 15,
Then, the ring portion 11 is fitted into the concave groove 16.
At the same time, the shaft 7 is connected to the pair of inward flange portions 13, 14,
And inserted through the inside of the plurality of sprags 3 to complete a one-way clutch.

The operation itself when the one-way clutch constructed as described above transmits rotational motion in only one direction is the same as that of the above-described conventional one-way clutch.

That is, as shown in FIG. 13, in a state where the members 2, 3, and 7 are assembled, when the outer ring 2 tries to rotate clockwise or the shaft 7 rotates As shown in FIG. 16, the sprags 3, 3 have elasticity of the connecting portions 10, 10 due to the frictional force acting between the inner and outer ends and the outer peripheral surface of the shaft 7 or the inner peripheral surface of the outer ring 2. It tends to rotate clockwise in opposition. Then, the frictional force acting between the inner and outer ends of each sprag 3, 3 and the outer peripheral surface of the shaft 7 or the inner peripheral surface of the outer ring 2 becomes smaller, and the relative rotation between the outer ring 2 and the shaft 7 becomes free. Become.

Conversely, if the outer ring 2 is to rotate counterclockwise or the shaft 7 is to rotate clockwise, respectively, the sprags 3, 3
15 tends to rotate counterclockwise as shown in FIG. 15 due to the frictional force acting between the inner and outer ends and the outer peripheral surface of the shaft 7 or the inner peripheral surface of the outer ring 2. Then, both the inner and outer ends of each sprag 3, 3 tend to bite into the outer peripheral surface of the shaft 7 or the inner peripheral surface of the outer ring 2, and the relative rotation between the outer ring 2 and the shaft 7 becomes impossible.

The operation described above is the same as that of the above-described conventional one-way clutch. In particular, the one-way clutch of the present invention has a small number of components, simplifies the operations of component processing, component management, and assembly, and can reduce manufacturing costs. In addition, since the plurality of sprags 3, 3 themselves are made of metal, the wear resistance of each sprag 3, 3 can be sufficiently ensured. Moreover,
Since the elastic member composed of the connecting portions 10 and 10 and the ring portion 11 is made by injection molding of a synthetic resin or an elastomer, the sprags 3 and 3 are connected to the connecting portions 10 and 10 constituting the elastic member.
It is also easy to form the sprag ring 9 by inserting the elastic member and the sprags 3 and 3 integrally at the tip of the sprag ring 10.

19 to 21 show a second embodiment of the present invention. In the first embodiment described above, only one ring portion 11 is provided,
While multiple sprags 3, 3 were cantilevered,
In the case of the present embodiment, a pair of ring portions 11, 11 is provided so as to sandwich the plurality of sprags 3, 3, and both ends of the plurality of sprags 3, 3 are supported.

Further, between the inner peripheral surfaces of both ends of the cylindrical outer ring 2 and the outer peripheral surface of the shaft 7, annular bearing plates 17, 17 are provided, and each of the bearing plates 17, 17 has a function as a radial bearing. Have.

Other configurations and operations are the same as those in the above-described first embodiment, and thus redundant description will be omitted.

Next, FIGS. 22 to 23 show a third embodiment of the present invention. In the case of the present embodiment, spring pieces 18, 18 are formed integrally with the respective ring portions 11, 11 on the outer peripheral edges of the ring portions 11, 11 constituting the sprag ring 9. And each spring piece 1
The sprag ring 9 is supported on the inner side of the outer ring 2 without backlash by elastically pressing the tips of the 8, 8 against the inner peripheral surface of the outer ring 2 (FIG. 21).

Other configurations and operations are the same as those of the above-described first and second embodiments, and thus redundant description will be omitted.

Next, FIG. 24 shows a fourth embodiment of the present invention. In the case of the above-described second embodiment, the outer ring 2 is rotatably supported around the shaft 7 by bearing plates 17, 17 separate from the sprag ring 9. On the other hand, in the case of the present embodiment, the ring portions 11 constituting the sprag ring 9 have a function as a radial bearing.

That is, the elastic member constituting the sprag ring 9 is formed of a slippery elastic material such as nylon, and the outer diameter of each of the ring portions 11 and 11 is changed to the inner diameter of the outer ring 2 and each of the ring portions 1.
The inner diameters of 1 and 11 are formed equal to the outer diameter of the shaft 7, respectively.

For this reason, in the case of the present embodiment, the shaft 7 and the outer ring 2 are supported by the respective ring portions 11 and 11 concentrically and freely relative to each other.

Other configurations and operations are the same as those of the above-described first and second embodiments, and thus redundant description will be omitted.

(Effects of the Invention) Since the one-way clutch of the present invention is configured and operates as described above, the number of components is small, and the manufacturing cost can be reduced by simplifying the parts processing, parts management, and assembly work. In addition, the wear resistance of the sprag can be ensured, and sufficient durability can be ensured.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 18 show a first embodiment of the present invention, and FIG. 1 is a side view of a sprag ring integrally formed with a plurality of sprags and a ring-shaped elastic member. 2 is a sectional view taken along line AA of FIG. 1, FIG. 3 is another side view seen from the right side of FIG. 2, FIG. 4 is a sectional view taken along line BB of FIG. 2, and FIG. , FIG. 6 is a side view of the outer ring, FIG. 7 is another side view of the outer ring, FIG. 8 is a cross-sectional view taken along line CC of FIG. 7, FIG. 9 is a perspective view of the outer ring, FIG. FIG. 11 is a sectional view showing a state where the sprag ring and the outer ring are combined, FIG. 11 is a sectional view taken along line DD of FIG. 10, FIG. 12 is a sectional view showing a state where a shaft is inserted, and FIG. FIG. 14 is a cross-sectional view showing the relationship between the sprags and the gap, and FIG.
The figure is a partial sectional view showing the state at the time of non-transmission.
The figure is for explaining the connection between the sprag and the elastic member.
FIG. 18 is a perspective view of a sprag ring alone, FIG. 18 is a perspective view of a sprag ring alone, FIGS. 19 to 21 show a second embodiment of the present invention, FIG. 19 is a side view of the sprag ring, and FIG. FIG. 19 is a sectional view taken along line FF of FIG. 19, FIG. 21 is a sectional view showing the assembled state, and FIGS. 22 to 23 show a third embodiment of the present invention.
FIG. 22 is a side view of the sprag ring, and FIG.
G sectional view, FIG. 24 is a sectional view showing a fourth embodiment of the present invention,
FIGS. 25 to 27 show a conventional one-way clutch.
The figure is a partially longitudinal side view, and FIG. 26 shows the state at the time of torque transmission.
FIG. 27 is a partial cross-sectional view showing a non-transmission state. 1: inner ring, 2: outer ring, 3: sprag, 4: leaf spring, 5, 6: retainer, 7: shaft, 8: gap, 9: sprag ring, 10: connecting part, 11:
Ring part, 12: cylindrical part, 13, 14: inward flange part, 15: notch, 16: concave groove, 17: bearing plate, 18: spring piece.

Claims (3)

(57) [Scope of request for utility model registration] An inner ring and an outer ring arranged concentrically with each other;
An irregularly shaped piece having a length dimension larger than the diameter dimension of the gap existing between the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring, and a width dimension smaller than the diameter dimension. And a plurality of sprags arranged in the gap,
In a one-way clutch comprising an elastic member provided in the gap and biasing each sprag in the same rotational direction, the plurality of sprags are made of metal, and the elastic member is made of synthetic resin or elastomer. It has a shape having an annular ring portion over the entire circumference of the gap, and the plurality of sprags are inserted into a part of the elastic member and integrally connected to the elastic member. Features one-way clutch. 2. The outer ring has a function as a radial bearing by sliding an inner peripheral edge of an inward flange portion formed at an open end of the outer ring to an outer peripheral surface of the inner ring.
The one-way clutch according to claim 1. 3. The one-way clutch according to claim 1, wherein a shaft is arranged concentrically with the outer ring instead of the inner ring.