JPH0545861Y2 - - Google Patents

Description

[Detailed description of the invention] a. Purpose of the invention (industrial application field) A roller clutch incorporating a retainer according to this invention has two members assembled concentrically, one of which rotates in both directions. It is used to transmit only the rotational motion in one direction to the other member when a member moves, and is used, for example, by being incorporated into the paper feeding mechanism of a facsimile machine or a copying machine.

(Prior Art) Roller clutches that transmit rotational motion in only one direction are incorporated and used in various mechanical devices such as paper feeding mechanisms of facsimiles and copying machines.

Various structures of roller clutches used for such various applications have been known from the past, but for example, the roller clutch disclosed in Japanese Utility Model Application Publication No. 59-66033 is as shown in FIGS. 7 and 8. , cylindrical outer ring 1
and has an outer diameter smaller than the inner diameter of this outer ring 1,
A shaft 2 with a circular cross section is inserted inside the outer ring 1 concentrically with the outer ring 1, and inserted into a cylindrical gap 3 existing between the outer circumferential surface of the shaft 2 and the inner circumferential surface of the outer ring 1. a retainer 5 that holds the multiple rollers 4, 4 at equal intervals within the gap 3; It is composed of springs 6, 6 that press in a clockwise direction (in FIG. 8). The retainer 5 and the outer ring 1 include tongue pieces 21 formed on the outer peripheral surface of the retainer 5,
21 (see FIGS. 1 and 2) and the recesses 7 and 7 described below prevent them from rotating relative to each other.

On the inner circumferential surface of the outer ring 1, in the portion where the rollers 4, 4 held by the retainer 5 face each other, recesses 7, 7, which are long in the width direction of the outer ring 1 and have an arcuate cross section, are formed. By doing so, the width of the gap 3 in the area where the recesses 7, 7 are formed is made slightly larger than in other areas.

In the conventional roller clutch constructed as described above, for example, the shaft 2 is moved to the eighth position while the outer ring 1 is fixed.
When rotated counterclockwise as shown in the figure (or when outer ring 1 is rotated clockwise with shaft 2 fixed),
The direction in which the rollers 4, 4 move as the shaft 2 rotates (counterclockwise in FIG. 8) and the direction in which the springs 6, 6 move the rollers 4, 4 are mutually In other words, the outer circumferential portions of the rollers 4, 4 are located in the recesses 7, 7 formed on the inner circumferential surface of the outer ring 1.
The end of the outer ring 1 is separated from the part where the inner diameter is reduced (each roller 4, 4 and the recess 7, 7
). Therefore, each roller 4, 4 becomes able to roll within 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 becomes free. Therefore, the rotational force of the shaft 2 is no longer transmitted to the outer ring 1.

On the other hand, if the shaft 2 is rotated clockwise in Fig. 8 with the outer ring 1 fixed (or if the outer ring 1 is rotated counterclockwise with the shaft 2 fixed), the rotation of the shaft 2 Accordingly, the direction in which the rollers 4, 4 move (clockwise in FIG. 8) coincides with the direction in which the springs 6, 6 press the rollers 4, 4, and the rollers 4, 4 move into the recess. At the ends of 7, 7, the inner diameter of the outer ring 1 is moved toward a portion where the inner diameter becomes smaller. The dimension of the cylindrical gap 3 between the inner circumferential surface of the outer ring 1 and the outer circumferential surface of the shaft 2 is smaller than the outer diameter dimension of each roller 4, 4, except for the portion where the recesses 7, 7 are formed, so that the above-mentioned When each roller 4, 4 moves toward the end of each recess 7, 7, each roller 4, 4 bites into a part of the gap 3 at the end of each recess 7, 7, To prevent outer ring 1 and shaft 2 from rotating relative to each other.
Therefore, the rotational force of the shaft 2 is directly transmitted to the outer ring 1.

The roller clutch is constructed and operates as described above, and includes a plurality of rollers 4, 4 installed in a cylindrical gap 3 formed between the inner circumferential surface of the outer ring 1 and the outer circumferential surface of the shaft 2. It is necessary to provide springs 6, 6 between the rollers 4 and the retainer 5 to press the rollers 4, 4 in the same direction.

For this reason, conventionally, the plurality of rollers 4, 4 are pressed by a metal leaf spring 8 or 9 having a shape as shown in FIGS. 9-10 or 11. Ta.

Of the above two types of leaf springs 8 and 9, the leaf spring 8 shown in Figs. An intermediate portion of a spring portion 8b formed in a chevron shape is connected to the lower edge of the mounting base portion 8a to be attached to the outer peripheral surface, and each roller 4, 4 is pressed by this spring portion 8b.

In addition, the leaf spring 9 shown in Fig.
This is disclosed in Japanese Patent No. 27336, and a plate spring 9 formed in a substantially M-shape is attached to the outer peripheral surface of the retainer 5 so as to press each roller 4 in the same direction. .

By the way, as mentioned above, the metal leaf springs 8 and 9 are used to press the rollers 4 and 4,
When attaching the leaf springs 8, 9 to the retainer 5 made of synthetic resin, manufacturing the fine leaf springs 8, 9 and assembling the leaf springs 8, 9 and the retainer 5 is troublesome, and the roller clutch is difficult to assemble. This will lead to higher production costs.

For this reason, as shown in FIG.
It was disclosed in Japanese Patent Publication No. 42-1042 that the springs 6, 6 and the retainer 5 for pressing (see Figs. 7 and 8) were integrally molded from synthetic resin, and this was not actually used. ing.

The conventional spring-integrated cage 5 has a pair of ring-shaped rims 10, 10 spaced apart from each other and connected to each other by connecting portions 11, 11 in the same number as the number of rollers 4, 4 to be held, and the area surrounded by the pair of rims 10, 10 and the adjacent connecting portions 11, 11 on all four sides is called the rollers 4, 4.
There are pockets 12, 12 for storing items.
At the center of the same circumferential side of each of the connecting portions 11, 11, a spring piece 1 formed in a mountain shape is provided, similar to the spring portion 8b of the leaf spring 8 shown in Figs. 9 and 10.
3, 13 are integrally formed with the connecting portions 11, 11,
The rollers 4, 4 housed in the pockets 12, 12 are pressed in the same circumferential direction.

(Problems to be Solved by the Invention) However, in the case of the conventional integrated roller retainer configured as described above, the following disadvantages occur.

That is, when manufacturing an integrated roller cage, it is made by injection molding synthetic resin, but in the case of the conventional roller cage 5 having the shape shown in FIG. 12, multiple molds are used after molding. We had no choice but to adopt a so-called radial draw mold in which the cage is separated into at least the same number of connecting parts 11, 11 and then escape in the radial direction, and the mold for injection molding becomes complicated. The production cost will increase.

The roller retainer of the roller clutch of the present invention solves the above-mentioned problems by being able to be molded with a so-called axial draw mold, which only requires dividing the mold into two parts after molding, due to its ingenious shape. It is something to do.

b. Structure of the invention (means for solving the problem) The roller retainer of the roller clutch of the present invention has an outer ring and an outer diameter smaller than the inner diameter of this outer ring, as in the case of the conventional cage described above. A shaft with a circular cross section is inserted inside the outer ring concentrically with the outer ring, and the dimension of the largest part of this gap is inserted into the gap between the outer peripheral surface of this shaft and the inner peripheral surface of the outer ring. and a retainer that holds the rollers within the gap. .

In the roller retainer of the present invention that is incorporated into the roller clutch as described above, a plurality of pillars are formed integrally with the rim on one side of the annular rim that can freely enter into the gap. A pocket is formed between adjacent column parts in which the roller can be rotated and moved slightly in the circumferential direction and can be stored therein. A rim portion is not provided at the other end of the plurality of pillars having one end connected to the rim portion in this manner.

At the same time, in the pocket, there is provided a spring piece whose base end is continuous with the rim or column, and which extends from the base end toward the adjacent column in an inclined state in only one direction. It is formed integrally with the rim portion and pillar portion.

Furthermore, a through hole having a size equal to or larger than the orthographic plane of the spring piece relative to the rim is formed in a part of the rim facing the pocket end.

(Function) The roller retainer of the roller clutch of the present invention, constructed as described above, has an inner circumferential surface of the outer ring constituting the roller clutch and an inner surface of the outer ring, as in the case of the conventional retainer described above. It is inserted into a gap formed between the outer peripheral surface of a shaft inserted concentrically, and the rollers are positioned between adjacent pillars in this gap, and the spring piece , press each roller in the same circumferential direction.

However, in the case of the roller retainer of the present invention, the rim portion is provided only at one end of the plurality of pillar portions, and the spring pieces are inclined only in one direction, and the rim portion is provided at a part of the rim portion. A through hole having a size equal to or larger than the orthographic projection plane of the spring piece is formed so that a part of the mold for forming the spring piece can also escape in the direction of the rim part after molding. Therefore, by using an axial draw type mold, it is possible to mold this cage in one piece.

(Example) Next, the present invention will be explained in more detail while explaining the illustrated embodiment.

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a perspective view showing the overall structure of a roller retainer, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, and FIG. It is an arrow view.

The roller retainer 14 of the present invention shown in FIGS. 1 to 3
In this case, it is possible to freely enter the gap 3 (see Figs. 7 and 8) between the inner peripheral surface of the cylindrical outer ring 1 and the outer peripheral surface of the shaft 2 inserted concentrically into the outer ring 1. A plurality of (six in the illustrated example) pillar portions 16, 16 are provided on one side of the circular rim portion 15.
It is formed integrally with the

As described above, by connecting one end to the rim part 15, adjacent pillar parts 16, 1 among the plurality of pillar parts 16, 16 arranged parallel to each other and at equal intervals
Pockets 17 are formed between the rollers 6, each of which allows one roller 4 to be rotated and moved slightly in the circumferential direction. A plurality of pillar parts 1 having one end connected to the rim part 15 in this way
The rim portion 15 is not provided at the other end of the pillar portions 6, 16, and each column portion 16, 16 is supported in a cantilevered manner on one rim portion 15.

On the other hand, inside the plurality of pockets 17, 17,
One spring piece 13, 13 is formed respectively. Each spring piece 13, 13 shown in Figs.
The base end portion is continuous with the side surface of the rim portion 15,
It extends from this base end toward the adjacent column part 16 in an inclined state in the same direction, and has a tip end thereof as a pressing part 18 that is substantially parallel to the column parts 16 , 16 . Each spring piece 13, 13 is connected to the column part 16, 16.
Similarly, it is formed integrally with the rim portion 15 described above.

In addition, a through hole 19 is formed in a portion of the rim portion 15 that faces the end of the gap 3 in which the roller 4 is accommodated to allow a portion of the mold forming the spring pieces 13, 13 to escape. are doing. The size of the through hole 19 is equal to or larger than the orthogonal projection plane of the spring piece 13 on the rim part 15, and as described above, a part of the mold for forming the spring piece 13 is inserted in the direction of the rim part 15 through the through hole 19. I'm trying to make it so that I can escape.

Furthermore, in the illustrated embodiment, each column 16,1
The pocket 1 is formed between the adjacent pillar parts 16, 16 by providing an overhang part 20 extending toward the adjacent pillar parts 16, 16 on the inner peripheral edge of one side of the pocket 6.
7 and 17, the width W of the inner circumferential opening of this pocket 1
Diameter R of rollers 4, 4 stored in 7, 17
(See FIG. 5) (W<R) to prevent the rollers 4, 4 from falling off to the inner peripheral side of the roller holder 14 even before the shaft 2 is inserted.
Such overhanging portions 20, 20 could not be formed in the case of a cage having the shape shown in FIG. 12.

Further, in FIGS. 1 and 2, 21, 21 are locking tongue pieces formed protruding from the outer peripheral edge of the rim portion 15,
When the roller retainer 14 is fitted into the outer ring 1, the tongue pieces 21, 21 fit into the recesses 7, 7 formed on the inner peripheral surface of the outer ring 1, as shown in FIG. This prevents the container 14 from rotating relative to the outer ring 1.

The roller retainer 14 of the roller clutch of the present invention constructed as described above is different from the conventional retainer 5 described above.
As shown in Figures 5 and 6, a roller clutch is formed between the inner circumferential surface of the outer ring 1 constituting the roller clutch and the outer circumferential surface of the shaft 2 inserted concentrically inside the outer ring 1. It is inserted into the gap 3 to position the plurality of rollers 4, 4 within the gap 3 and to press each roller 4, 4.

That is, among the plurality of pillar parts 16, 16 constituting the roller holder 14, the plurality of rollers 4, 4 in the gap 3 between the adjacent pillar parts 16, 16
positioning. At the same time, each column 16,
The spring pieces 13, 13 formed on the same side of the rollers 16 press the rollers 4, 4 in the same circumferential direction.

The above-mentioned operation itself is exactly the same as that of the conventional cage 5 shown in FIG.

However, in the case of the roller retainer 14 of the present invention, the rim portion 15 is provided only at one end of the plurality of pillar portions 16, 16, and the spring piece for the rim portion 15 is provided on a part of the rim portion 15. A through hole 19 having a size equal to or larger than the orthographic projection plane of the spring pieces 13, 13 is formed so that a part of the mold for forming the spring pieces 13, 13 is also formed in the direction of the rim part 15 after molding. It is designed so that it can escape, and each spring piece 13,1
Since the shape of 3 itself is inclined only in one direction, so-called axial injection molding of synthetic resin is performed using a two-piece mold that moves only in the directions of arrows X and Y in Figure 1. By employing a draw type mold, this roller retainer 14 can be integrally molded. Moreover, as mentioned above, each column part 16, 1
Since it is possible to form the protruding parts 20, 20 on the inner peripheral edge of the rollers 4, 20 before inserting the shaft 2,
4 can be reliably prevented from falling off.

In the embodiment shown in FIGS. 1 to 3, the base of the spring piece 13 is connected to the inner surface of the rim part 15, but the base of the spring piece 13 is connected to the fourth
As shown in the figure, it may be connected to the side surface of the column 16.

c. Effects of the invention The roller retainer of the roller clutch of the present invention is constructed and functions as described above, but is made of synthetic resin using an axial draw mold, which is relatively easy to manufacture. Since it is possible to perform integral molding of the roller retainer, the manufacturing cost of the roller retainer can be reduced and an inexpensive roller clutch can be obtained.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a perspective view showing the overall structure of a roller retainer, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, and FIG. arrow view,
Fig. 4 is a view similar to Fig. 3 showing another example of the spring piece, Fig. 5 is a partial sectional view showing the state in which this roller retainer is assembled into a roller clutch, and Fig. 6 is a view taken along the line C-C in Fig. 5. 7 and 8 show an example of a conventional roller clutch, FIG. 7 is a vertical side view, FIG. 8 is a half longitudinal front view, and FIGS. 9 and 10 are conventional roller clutches. Fig. 9 is a partial plan view, and Fig. 10 is a partial plan view of the metal leaf spring.
FIG. 11 is a perspective view showing the second example, and FIG. 12 is a perspective view of a conventional spring-integrated roller retainer. 1... Outer ring, 2... Shaft, 3... Gap, 4... Roller, 5... Cage, 6... Spring, 7... Recessed part,
8... Leaf spring, 8a... Mounting base, 8b... Spring part, 9... Leaf spring, 10... Rim part, 11... Connecting part, 12... Pocket, 13... Spring piece, 14
...Roller retainer, 15...Rim portion, 16...Pillar portion, 17...Pocket, 18...Press portion, 19...
...through hole, 20...projection, 21...tongue.

Claims (1)

[Scope of utility model claims] an outer ring, a shaft with a circular cross section that has an outer diameter smaller than the inner diameter of the outer ring and is inserted inside the outer ring concentrically with the outer ring, and between the outer circumferential surface of the shaft and the inner circumferential surface of the outer ring. A plurality of rollers are inserted into a gap and have an outer diameter dimension smaller than the dimension of the largest part of this gap and larger than the dimension of the smallest part of this gap, and the plurality of rollers are held within the gap. In the roller retainer that is incorporated into a roller clutch consisting of a retainer, a plurality of pillars are formed integrally with the rim part on one side of a ring-shaped rim part that can freely enter into the above-mentioned gap, and a plurality of pillar parts are formed integrally with the rim part, and adjacent A pocket is formed between the pillar parts in which the roller can be rotated and moved slightly in the circumferential direction, and the base end is continuous with the rim part or the pillar part. A spring piece that extends toward the pillar part while being inclined in only one direction is formed integrally with the rim part and the pillar part, and a part of the rim part facing the pocket end has this rim part. A roller retainer for a roller clutch, characterized in that a through hole is formed with a size equal to or larger than the orthographic plane of the spring piece.