JPH0752429Y2 - Roller clutch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) A roller clutch according to the present invention has two members that are concentrically assembled with each other and one of them is rotated in both directions. It is used when transmitting only one-direction rotational motion to the other member, and is used by being incorporated in a paper feeding mechanism of a facsimile or a copying machine, a video tape recorder, or the like.

(Prior Art) A roller clutch that transmits only rotational movement in a specific direction is incorporated and used in various mechanical devices such as a paper feed mechanism of a facsimile or a copying machine.

Various types of roller clutch structures used for such various applications have been known in the past.
The roller clutch disclosed in Japanese Patent No. 033 is configured as shown in FIGS.

In FIGS. 9 to 10, 1 is a cylindrical outer ring, and a shaft 2 having a circular cross section is inserted inside the outer ring 1 concentrically with the outer ring 1. Further, a plurality of rollers 4, 4 and the plurality of rollers 4, 4 are provided in a cylindrical gap 3 existing between the outer peripheral surface of the shaft 2 and the inner peripheral surface of the outer ring 1. A cage 5 for holding the rollers 3 at equal intervals in the gap 3 and springs 6, 6 for pressing the rollers 4, 4 in the same circumferential direction (clockwise in FIG. 10) are provided.

On the inner peripheral surface of the outer ring 1, each roller 4 held by the cage 5,
By forming recesses 7, 7 having a circular arc-shaped cross section and functioning as a cam surface in the width direction of the outer ring 1, the arc-shaped recesses 7, 7 are formed at the portions where the arc-shaped recesses 7, 7 face each other. The size of the gap 3 in the radial direction is slightly larger than the size of the other parts in the radial direction.

In the conventional roller clutch configured as described above,
For example, when the shaft 2 is rotated counterclockwise in FIG. 10 with the outer ring 1 fixed (or when the outer ring 1 is rotated clockwise with the shaft 2 fixed), the shaft 2 (or the outer ring 1 ) Rotation of the rollers 4 and 4 (the first direction)
(Counterclockwise direction in FIG. 10) and the directions in which the springs 6 and 6 try to move the rollers 4 and 4 are opposite to each other, and the outer peripheral portions of the rollers 4 and 4 are located on the inner peripheral surface of the outer ring 1. At the ends of the formed recesses 7, 7, the outer ring 1 tends to separate from the part where the inner diameter is small. For this reason, the rollers 4 and 4 are in a state in which they can roll in the gap 3 between the inner peripheral surface of the outer ring 1 and the outer peripheral surface of the shaft 2, and the relative rotation between the outer ring 1 and the shaft 2 is free. As a result, the rotational force of the shaft 2 will not be transmitted to the outer ring 1.

On the contrary, when the shaft 2 is rotated clockwise in FIG. 10 with the outer ring 1 fixed (or when the outer ring 1 is rotated counterclockwise with the shaft 2 fixed), the shaft 2 (or With the rotation of the outer ring 1), the direction in which the rollers 4, 4 move (clockwise in FIG. 10) and the springs 6, 6 are set by the rollers 4, 4.
The rollers 4 and 4 move toward the portion where the inner diameter of the outer ring 1 has become smaller at the end portions of the recesses 7 and 7 in agreement with the direction of pressing. The radial dimension of the cylindrical gap 3 between the inner peripheral surface of the outer ring 1 and the outer peripheral surface of the shaft 2 is larger than the outer diameter dimension of each of the rollers 4, 4 except for the portions where the recesses 7, 7 are formed. Because of the small size, when the rollers 4 and 4 move toward the ends of the recesses 7 and 7 as described above, the rollers 4 and 4 move to the recesses 7 and 7, respectively.
At the end of the outer ring 1
And the shaft 2 are prevented from rotating relative to each other. Therefore, the rotation of the shaft 2 is directly transmitted to the outer ring 1.

By the way, in the roller clutch constructed and operated as described above, by simplifying the structure of the injection molding die,
At the same time as facilitating the production of the cage 5, the rollers 4, 4
In order to simplify the shape of the springs 6, 6 for pressing, the pillars forming the pockets for holding the rollers 4, 4 are disclosed, for example, as disclosed in Japanese Utility Model Laid-Open No. 54-69259. A structure that supports the ring-shaped rim in a cantilever manner is considered.

In the case of this conventionally conceived structure, as shown in FIGS. 11 to 12, a retainer 8 fitted inside the outer ring 1 is provided with a plurality of pillars on one surface of a single and ring-shaped rim 9. 10 and 10 are provided in parallel with each other at equal intervals, and between the adjacent columns 10 and 10,
The pockets 11, 11 for holding the rollers 4, 4 rotatably are formed.

Recesses 1 are formed on the same side surface in the circumferential direction of each of the pillars 10 and 10.
2 and 12 are formed, and an S-shaped spring 1 is formed in each recess 12 and 12.
The rollers 3 and 13 are fitted and the rollers 4 and 4 held in the pockets 11 and 11 are pressed in the same direction in the circumferential direction.

In the case of the roller clutch configured as described above, the mold for injection-molding the cage 8 made of synthetic resin may have a simple structure, and the spring 13 may have a relatively simple shape. Become.

(Problems to be Solved by the Invention) However, in the case of the improved roller clutch configured as described above, there is a disadvantage that not only the assembly work is troublesome, but also downsizing is difficult to achieve.

That is, when assembling the roller clutch, first, each pillar 10,
After inserting the springs 13 and 13 into the recesses 12 and 12 formed in the roller 10, the rollers 4 and 4 are pushed into the pockets 11 and 11. The springs 13 and 13 inserted into the recesses 12 and 12 are Before the push-in of 4, the rollers 12 easily come out of the recesses 12, 12, and if they do come out, the roller clutch will not exhibit the desired performance.

Further, the widths w (FIG. 12) in the circumferential direction of the springs 13, 13 which are formed into an S shape as a whole tend to be large, and it is difficult to reduce the size of the roller clutch accordingly.

The roller clutch of the present invention eliminates the above-mentioned inconvenience.

(Means for Solving the Problem) The roller clutch of the present invention is similar to the above-described conventional improved roller clutch in that it has a cylindrical outer ring having a cam surface on its inner peripheral surface, and the outer ring inside the outer ring. A shaft having a circular cross section inserted concentrically with a plurality of rollers inserted in a gap between the outer peripheral surface of the shaft and the inner peripheral surface of the outer ring, and a single ring-shaped rim on one side. A plurality of pillars are provided in parallel with each other at equal intervals, and are fitted inside the outer ring so as to be incapable of rotating with respect to the outer ring. It is composed of a retainer for holding and a spring which is provided between the retainer and each of the rollers and presses each roller in the same circumferential direction.

Further, in the roller clutch of the present invention, a locking hole is formed inside each of the pillars, the locking hole opening to the front end surface side of each pillar, and the locking hole and the same side surface of each pillar in the circumferential direction on the end surface of each pillar. By forming notch-shaped recesses that connect with each other and folding back the spring material, one piece of the spring formed in a substantially U shape is inserted into the locking hole formed in each of the columns. Then, the other piece of the spring is pressed against the outer peripheral surface of the roller held inside the pocket.

(Operation) In the case where the roller clutch of the present invention configured as described above transmits only the unidirectional rotational motion between the outer ring and the shaft, the operation itself is the same as in the conventional roller clutch described above. Is the same as.

However, in the roller clutch of the present invention, since one piece of the spring formed in a substantially U shape is inserted into the locking hole formed in the pillar that constitutes the retainer, before the roller is installed in the pocket. Also in this case, this spring is hard to come off from the column, and therefore the assembly work of the roller clutch becomes easy.

Further, since the spring formed by bending the spring material into a U shape does not have a large width in the circumferential direction, it is possible to downsize the roller clutch incorporating this spring.

(Embodiment) Next, the present invention will be described in more detail with reference to the illustrated embodiment.

1 to 8 show an embodiment of the present invention, FIG. 1 is a partial perspective view of a cage, FIG. 2 is a partial sectional view showing a state in which a spring and a roller are assembled to the cage, 3 is an end view, FIGS. 4 to 5 show two examples of the shape of a spring, respectively, plan views, and FIGS. 6 to 7 show two examples in a state of being incorporated in an outer ring, respectively, sectional views and FIG. FIG. 6 is a perspective view corresponding to part A of FIG. 1 showing another example of the shape of the cage.

As shown in FIGS. 1 to 3, a retainer 14 for constituting a roller clutch of the present invention has a plurality of columns 16 and 16 on one side of a single and circular ring-shaped rim 15 in parallel and at equal intervals. It is provided in. A plurality of protrusions 17 and 17 are formed on the outer peripheral edge of the rim 15. The protrusions 17 and 17, when the retainer 14 is fitted inside the outer rings 18 and 19 (Figs. 6 to 7), The cage 14 is engaged with the recesses (not shown) formed on the inner peripheral surfaces of the outer rings 18 and 19 so that the retainer 14
Prevents rotation against 18 and 19.

Further, on the inner peripheral edge of each of the columns 16 and 16, a collar portion 20,
By forming 20, the width W of the inner peripheral side opening of the pockets 21, 21 provided between the adjacent pillars 16, 16 is set to the roller 4,
The outer diameter D of the roller 4 is made smaller (W <D), and the rollers 4 and 4 held inside the pockets 21 and 21 have the cage 14
I try not to drop it inside.

Further, inside the columns 16, 16, there are formed locking holes 22 that open to the tip end surface side of the columns 16, 16. And each locking hole
As shown in FIG. 4 or FIG. 5, the central portion of the spring material is folded back into 22 to insert one piece 23a of the spring 23 formed in a substantially U shape, and The outer surface of the other piece 23b is elastically brought into contact with the outer peripheral surface of the roller 4 held in the pocket 21.

Further, a notch-shaped recess 24 is formed on the end surface of each of the columns 16 and 16 to connect the opening-side end of each of the locking holes 22 and the same circumferential side surface of each of the columns 16 and 16. is doing. One piece 23
When the spring 23 is attached to the pillar 16 by inserting a into the locking hole 22, the folded portion 23c of the spring 23 supported by the pillars 16 and 16 of the retainer 14 is located in the recess 24. Therefore, the folded-back portion 23c does not project from the end faces of the columns 16 and 16. The recess 24 for allowing the folded-back portion 23c of the spring 23 to pass through is provided only on the side surface of the column 16 as shown in FIG. 8, and as shown in FIG. It is not necessary to provide up to the outer peripheral side of 16.

The cage 14, the spring 23 and the roller 4 which are constructed as described above and combined with each other, as in the case of the conventional roller clutch, have the cage 14 and the outer rings 18, 19 as shown in FIGS. By non-rotatably fitting the inside of the shaft, and by inserting the shaft 2 (see FIGS. 9 to 10; omitted in FIGS. 6 to 7) inside the plurality of rollers 4 held by the holder 14. , Compose a roller clutch.

Of the structures shown in FIGS. 6 to 7, the structure shown in FIG. 6 is one in which the outer ring 18 is fitted into the housing 25 made of synthetic resin, and the structure shown in FIG. By bending both ends inward, inward flange portions 26, 26 are formed, and both inward flange portions 26, 26 prevent the retainer 14 holding the roller 4 from falling out from the inside of the outer ring 19. It is a thing.

The roller clutch of the present invention constructed as described above is
The operation itself in the case of transmitting only the rotational movement in one direction between the shafts 18 and 19 and the shaft 2 is the same as in the case of the conventional roller clutch described above.

That is, when the shaft 2 is rotated in one direction with respect to the outer rings 18 and 19, the rollers 4 and 4 cause the gap 3 (9th gap) between the inner peripheral surface of the outer rings 18 and 19 and the outer peripheral surface of the shaft 2 to rotate. (See FIGS. 10 to 10), the relative rotation between the outer circumferences 18 and 19 and the shaft 2 becomes free, and the rotational force of the shaft 2 is not transmitted to the outer rings 18 and 19.

On the contrary, when the shaft 2 is rotated in the other direction with respect to the outer rings 18 and 19, each of the rollers 4 and 4 forms part of the gap 3 between the inner peripheral surface of the outer rings 18 and 19 and the outer peripheral surface of the shaft 2. In order to prevent the outer wheels 18 and 19 from rotating relative to the shaft 2, the rotation of the shaft 2 is directly transmitted to the outer wheels 18 and 19.

However, in the case of the roller clutch of the present invention constructed and operated as described above, one piece 23a of the spring 23 during assembly work
Since the spring 23 and the pillar 16 are unlikely to be accidentally separated from each other after being inserted into the locking hole 22 of the pillar 16, the workability of assembling the roller clutch is improved.

The spring 23 made by folding the spring material back into a U shape
Since the width dimension in the circumferential direction does not become unnecessarily large, the roller clutch can be easily downsized.

(Effect of the Invention) The roller clutch of the present invention is constructed and operates as described above, but after the retainer and the spring are assembled, it becomes difficult to separate both members, so that the roller clutch can be easily assembled. In addition, since the width of the spring in the circumferential direction is reduced, the roller clutch can be downsized and the practical effects are large.

[Brief description of drawings]

1 to 8 show an embodiment of the present invention, FIG. 1 is a partial perspective view of a cage, FIG. 2 is a partial sectional view showing a state in which a spring and a roller are assembled to the cage, 3 is an end view, FIGS. 4 to 5 show two examples of the shape of a spring, respectively, plan views, and FIGS. 6 to 7 show two examples in a state of being incorporated in an outer ring, respectively, sectional views and FIG. Is a perspective view corresponding to part A of FIG. 1, showing another example of the shape of the cage, FIGS. 9 to 10 show a first example of a conventional roller clutch, and FIG. 9 is a vertical sectional side view. FIG. 10 is a longitudinal front view of a half portion, FIGS. 11 to 12 show a second example of a conventional roller clutch, FIG. 11 is a front view, and FIG. 12 is a sectional view taken along line BB of FIG. is there. 1: Outer ring, 2: Shaft, 3: Clearance, 4: Roller, 5: Cage, 6: Spring,
7: recess, 8: retainer, 9: rim, 10: pillar, 11: pocket, 12:
Recessed part, 13: spring, 14: retainer, 15: rim, 16: pillar, 17: protrusion, 18, 19: outer ring, 20: collar part, 21: pocket, 22: locking hole,
23: spring, 23a: one piece, 23b: the other piece, 23c: folded portion, 24: recessed portion, 25: housing, 26: inward flange portion.

Claims (1)

[Scope of utility model registration request] 1. A cylindrical outer ring having a cam surface on its inner peripheral surface,
A shaft having a circular cross section that is inserted concentrically with the outer ring inside the outer ring, and a plurality of rollers that are inserted in a gap between the outer peripheral surface of the shaft and the inner peripheral surface of the outer ring. A plurality of pillars are provided on one side of a ring-shaped rim in parallel with each other at equal intervals, and are fitted inside the outer ring so as not to rotate with respect to the outer ring, and inside the pocket provided between the adjacent pillars. A roller clutch comprising a retainer for holding the plurality of rollers, and a spring provided between the retainer and each of the rollers and pressing each roller in the same circumferential direction. A locking hole that opens to the tip surface side of each pillar is formed inside the pillar, and a notch-shaped recess that connects this locking hole and the same circumferential side surface of each pillar is formed on the end surface of each pillar. At the same time, by folding back the spring material, the spring formed in a substantially U shape The square pieces, the insert into locking holes formed in the pillars, roller clutch, wherein the other pieces of the spring, it presses the outer peripheral surface of the roller which is held inside the pockets.