JPH0615889B2 - One way clutch - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-way clutch that joins with each other only when rotating in one direction and integrally rotates.

[Conventional technology]

For example, the driven shaft is in a free state when the driving shaft rotates forward, and can be linked together to rotate together when the driving shaft rotates in reverse, and when the driving shaft becomes slower than the driven shaft, the driven shaft becomes free. An example of a one-way clutch capable of idling is a drive shaft having a hollow end and a drive shaft of the drive shaft, as shown in Japanese Utility Model Publication No. 15-1365 (hereinafter referred to as Conventional Example 1). A clutch main body in which a driven shaft having an end fitted in a hollow portion is rotatably combined with an auxiliary shaft inserted at the center as a guide is arranged laterally (sideways), and a plurality of clutches are provided on the end face of the driven shaft. There is a structure in which individual grooves are bored, the bottom surface of the groove is formed into a slanted curved surface, and a ball is housed between the slanted curved surface and the hollow bottom surface of the drive shaft.

Further, as shown in FIG. 7 of the accompanying drawings (hereinafter referred to as Conventional Example 2), a wedge shape in which the inner side surface is narrowed in one direction is formed at several points of the peripheral edge joint portion of the outer ring 1 ′ and the inner ring 2 ′. In a one-way clutch in which a groove 3'is formed and a spherical body 4'is interposed in the wedge-shaped groove 3 ', the spherical body 4'is attached by a spring 8'through a spring seat 7'in the direction of the narrow groove width. There is also one in which several different-diameter spherical bodies 4'are urged to intervene in the wedge-shaped groove 3'so that there is no gap.

[Problems to be solved by the invention]

However, in the one-way clutch of Conventional Example 1 described above, the ball bites into the narrow portion between the bottom surface of the groove of the driven shaft and the hollow bottom surface of the drive shaft to connect the drive shaft and the driven shaft. All balls do not move in the narrow direction of the groove when joined. That is, in FIGS. 1 (a) and 1 (b) of Conventional Example 1, only the ball between the hands moves in the narrow direction of the groove and bites in, but the ball on the opposite side (rear surface) in the wide direction of the groove. Since the ball moves on its own weight, and the balls on the upper and lower surfaces also move by its own weight in the width direction of the groove, only one ball in front will be joined, the other three balls will be idle, It is structurally clear that the ball is not in the narrow position shown in FIG. 1D. If the clutch main body is positioned horizontally, the bottom surface of the groove rises and slopes in the direction of the narrow groove width, so that it is impossible to bite the ball.

Therefore, the drive shaft and the driven shaft are not coupled instantaneously and reliably by biting of the ball, and a significant error occurs, which does not serve as a clutch.

Further, the one-way clutch of Conventional Example 2 requires parts such as the spring 8'and the spring seat 7'for urging the spherical body 4 ', so that the structure becomes complicated due to the increase in the number of parts, and the manufacturing thereof is difficult. However, because of the difficulty, the cost was increased.

Therefore, in the present invention, the connection by the biting of the sphere is performed by the slanted inner side surface of the wedge-shaped groove and the inner surface of the convex streak of the outer ring, and the bottom portion of the wedge-shaped groove is inclined downward in the direction of the narrow groove width, the self-weight of the sphere, By guiding the sphere with its own weight in the tilt direction by the mutual relationship such as contact relationship and rotation direction, the movement of the sphere at the time of joining is sharp,
It is an object of the present invention to provide a one-way clutch that surely improves the clutch function and eliminates the above-mentioned drawbacks of the prior art.

[Means for Solving the Problems]

In the present invention, for example, as shown in the drawings corresponding to the embodiments, a clutch main body in which an outer ring 1 and an inner ring 2 are rotatably combined with each other is horizontally arranged, and a peripheral edge of the outer ring 1 and the inner ring 2 is arranged. In a one-way clutch in which a wedge-shaped groove 3 whose inner surface is inclined and whose width is narrowed in one direction is formed at several points of the joint portion, and a spherical body 4 is interposed in the wedge-shaped groove 3, the wedge-shaped groove 3 The technical means is characterized in that the bottom portion 3a is inclined downward in the direction of the narrow groove width, and the spherical surface 4 in the wedge-shaped groove 3 is guided by the inclined surface in the inclination direction. It is a thing.

[Work]

Since the present invention has the above-mentioned configuration, the clutch main body is horizontally arranged, and the spherical body 4 is loosely fitted in the wedge-shaped groove 3 so as to be rollable and bites on the inner side surface of the wedge-shaped groove 3. Since the bottom portion 3a of 3 is inclined downward in the direction in which the groove width due to the inner side surface is narrow, in the normal state, it rolls in its lower direction by its own weight and is positioned (the position indicated by the dotted line in the figure). When 1 is rotated in the forward direction (for example, the direction of the solid line arrow in the figure), the spherical body 4 moves toward the inner surface of the outer ring 1 and the wedge-shaped groove 3.
Since it is in contact with the bottom of the outer ring 1, it rolls in the direction of rotation due to the frictional force with the outer ring 1 and moves in the direction in which the width of the wedge-shaped groove 3 is wide (the direction in which the inclined surface of the bottom 3a is high) close to the solid line position in the figure. By the way, the spherical body 4 is held in equilibrium by a frictional force, an inclined surface, etc., stands still, and idles at that position. Therefore, the outer ring 1 and the inner ring 2 are in a free state without being coupled, and only the outer ring 1 rotates in the forward direction.

Next, when the outer ring 1 is rotated in the opposite direction (for example, in the direction of the dotted arrow in the figure), the spherical body 4 is guided in the lower direction of the inclined surface of the bottom portion 3a of the wedge-shaped groove 3 in combination with the inner surface of the outer ring 1 and the frictional force. The outer ring 1 and the inner ring 2 are integrated through the spherical body 4 because they rapidly roll in the direction of the narrow width of the wedge-shaped groove 3 to near the position of the dotted line in the figure and bite between the wedge-shaped groove 3 and the inner surface of the outer ring 1. And the outer ring 1 drives the inner ring 2 to rotate in the opposite direction.

〔Example〕

An embodiment of a one-way clutch according to the present invention will be described below with reference to the drawings.

Embodiment 1 In FIGS. 1 to 3, reference numeral 1 denotes an outer ring, which has a ring-shaped convex portion 1a on its outer peripheral portion, and a main shaft 5 on a central boss portion 1b.
Is fixed. Reference numeral 2 denotes an inner ring, which is formed by a plate-shaped body that can be rotatably fitted to each other in the ring-shaped convex portion 1a of the outer ring 1 with an arbitrary gap, and the inner surface is inclined at several points on the outer peripheral portion thereof. In this way, wedge-shaped grooves 3 narrowed in one direction are formed at equal intervals, and the driven shaft 6 is attached to the central boss portion 2a.
Is fixed. The clutch main body composed of the outer ring 1 and the inner ring 2 is arranged horizontally, and the main driving shaft 5 and the driven shaft 6 are arranged vertically while maintaining the same axis.

Reference numeral 4 denotes a sphere, which freely rolls between the wedge-shaped groove 3 of the inner ring 2 and the inner surface of the ring-shaped convex portion 1a of the outer ring 1 in a wide groove portion and protrudes from the inner surface of the wedge-shaped groove 3 in a narrow portion. It is interposed so as to bite in contact with the inner surface of the shape 1a. Reference numeral 3a denotes a bottom portion of the wedge-shaped groove 3 of the inner ring 2, and the bottom portion 3a is integrally formed by being inclined downward in a direction in which the groove width of the wedge-shaped groove 3 is narrow, and the spherical body 4 in the wedge-shaped groove 3 rolls along the inclined surface. However, the inclination direction of the inclined surface, that is, the self-weight of the sphere 4, the contact relationship, the rotational direction, and the like, that is,
The spherical body 4 is guided in the narrow direction of the wedge-shaped groove 3 (the direction in which the inclined surface is low). Reference numeral 7 denotes a lid for the wedge-shaped groove 3 and an inner ring 2
It is integrally fixed by means of a set screw 8 or the like. Also, 9
Is a bearing of the driving shaft 5.

Embodiment 2 In FIGS. 4 to 6, a thin seat plate 1 integrally formed with an inclined bottom portion 10a corresponding to the bottom portion 3a of the wedge-shaped groove 3 of Embodiment 1.
0 is sandwiched between the pressing plate 11 and the holding plate 11, and the bottom portion 10a is inclined downward in the direction of the narrow groove width to guide the spherical body 4 in the wedge-shaped groove 3 in the narrow direction of the wedge-shaped groove 3. . However, the other structure is the same as that of the first embodiment, and the same reference numerals are given to the same portions and the description thereof will be omitted.

In addition, the outer ring 1, the inner ring 2, the spherical body 4, the lid body 7, and the seat plate 10 described above.
If there is no problem in strength depending on the purpose of use, all of the components such as can be made of synthetic resin,
It does not necessarily have to be made of metal.

In the above-mentioned structure, the spherical body 4 put in the wedge-shaped groove 3 is capable of rolling in its wide portion, and the bottom portion 3 of the wedge-shaped groove 3 is also possible.
Since a and 10a are inclined downward in the direction of the narrow groove width (see FIGS. 3 and 6), in a normal state (driven shaft), the bottoms 3a and 10a roll in the lower direction and are biased. (Refer to the dotted line position in the figure).

Therefore, when the outer ring 1 is rotated in the forward direction (for example, the direction of the solid line arrow a in the figure), the spherical body 4 is always in contact with the inner surface of the ring-shaped convex portion 1a of the outer ring 1, so that the frictional force causes the outer ring 1 to rotate. 1 in the direction in which the wedge-shaped groove 3 widens (the direction in which the slopes of the bottoms 3a and 10a are high) in the direction of the wide width of the wedge-shaped groove 3 to the position near the solid line in the figure, the frictional force with the inner surface of the outer ring 1 and the bottom 3a. , 10a, the angle of the inclined surface and the weight of the sphere 4 and the like cause the sphere 4 to be balanced and held in an equilibrium state to be stationary,
It idles at this position. At this time, since the proper gaps c and d exist between the spherical body 4 and the wedge-shaped groove 3, the idle motion is not hindered. Therefore, the outer ring 1 and the inner ring 2
Becomes free without being coupled, and only the outer ring 1 rotates in the forward direction.

Next, when the outer ring 1 is rotated in the opposite direction (for example, in the direction of the dotted arrow b in the figure), the spherical body 4 moves the ring-shaped convex portion 1a of the outer ring 1.
In combination with the frictional force with the inner surface of the wedge-shaped groove 3, the inside of the wedge-shaped groove 3 is quickly guided in the lower direction of the inclined surfaces of the bottoms 3a, 10a of the wedge-shaped groove 3 and rolls in the narrow direction of the wedge-shaped groove 3 to the vicinity of the dotted line position in the figure. The outer ring 1 and the inner ring 2 are integrally connected through the spherical body 4 so as to contact and bite between the side surface and the inner surface of the ring-shaped portion 1a of the outer ring 1, and the outer ring 1 drives the inner ring 2 to rotate in the opposite direction. Is.

The one-way clutch of the present invention performs the above-mentioned clutch operation, the clutch main body composed of the outer ring 1 and the inner ring 2 is positioned horizontally, and the shaft composed of the driving shaft 5 and the driven shaft 6 is positioned vertically. Therefore, for example, it is most suitable to be applied to the interlocking mechanism of the automatic fire extinguisher at the time of completion of rice cooking of the gas automatic rice cooker. That is, the inner ring 2 when the rice cooker is placed when cooking rice
Is integrally connected to the rice cooker via the driven shaft 6,
At the time of burner ignition operation, at the same time when the gas valve is opened, only the outer ring 1 resists the restoring force of the spring and moves in the positive direction at a fixed angle to the main shaft 5.
The outer ring 1 is urged in the direction of the solid arrow a to be set in a rice cooked state. Upon completion of rice cooking, when the temperature of the bottom of the rice cooker is detected and the connection between the rice cooker and the inner ring 2 is released, the outer ring 1 rotates in the direction of the dotted arrow b due to the restoring force of the spring, so that the outer ring 1 and the inner ring 2 are integrally connected. It rotates in the direction and returns to the original position, and at the same time, the gas valve is automatically closed.

Needless to say, the application example of the present invention is not limited to the automatic fire extinguisher of the gas automatic rice cooker.

〔The invention's effect〕

As described above, according to the present invention, the bottom of the wedge-shaped groove is inclined in a direction in which the width of the groove is narrow, and the spherical body in the wedge-shaped groove is inclined without using a spring or the like due to the mutual relations such as the weight of the sphere, the contact relationship and the rotating direction. Since it is guided in the direction, it does not require parts such as springs and spring seats unlike the conventional one-way clutch of this type, so that the structure is simple, the operation is smooth and reliable, and there are few failures. Further, if each component such as the outer ring, the inner ring, and the sphere is made of synthetic resin, uniform products can be mass-produced, which is advantageous in that the structure is simplified and the cost is extremely low. In addition, according to the second embodiment, the groove processing becomes easy.

[Brief description of drawings]

1 is a cross-sectional plan view showing a first embodiment of a one-way clutch according to the present invention, FIG. 2 is a vertical sectional front view, FIG. 3 is a sectional view taken along line XX of FIG. 1, and FIG. FIG. 5 is a partial vertical sectional front view, and FIG. 6 is YY of FIG.
FIG. 7 is a cross-sectional view showing an example of a conventional one-way clutch. 1 ... Outer ring, 2 ... Inner ring, 3 ... Wedge groove, 4 ... Sphere,
3a, 10a ... bottom.

Claims (1)

[Claims] 1. A clutch main body in which an outer ring and an inner ring are rotatably combined with each other is horizontally arranged, and the inner side surface is inclined at several points of a peripheral edge joint portion of the outer ring and the inner ring to narrow the width in one direction. In a one-way clutch in which a wedge-shaped groove is formed and a sphere is interposed in the wedge-shaped groove, the bottom of the wedge-shaped groove is inclined downward in the direction of the narrow groove width, and the sphere in the wedge-shaped groove is inclined by the inclined surface. A one-way clutch characterized by being guided in a direction.