JPH02195030A - One way clutch using spring - Google Patents

Abstract

PURPOSE:To get rid of the bending of a hook portion and the cutting accident of a coil spring, by putting an input hub idly into the inside of a close attachment coil spring pressingly put into the shaft hole of an output hub, and hanging stoppingly one end of the coil spring at the input hub. CONSTITUTION:When an input hub 3 rotates in an arrow e direction which is opposite to the coiling direction of a close attachment coil spring 2, the coil diameter of the close attachment coil spring 2 whose hook portion 2a is hung stoppingly at the groove 3a, is expanded, and the outer perimeter of the close attachment coil spring 2 bites at the inner perimeter surface of a shaft hole 1a at an output hub 1, resulting in a lock condition, and the rotation of the input hub 2 in the arrow e direction is transmitted to the output hub 1. When overload is added at the input hub 3 through a movable shaft 4 under this lock condition, a slip occurs between the outer perimeter of the close attachment coil spring 2 and the inner perimeter of the output hub 1, and the input hub 2 races, and when overload is released, return to the original function is immediately realized.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention transmits rotation in only one direction to the output side in a locked state, and rotation in the other direction is not locked and becomes a free state. This invention relates to a one-way clutch using a spring in which there is no transmission to the output side.

(Prior Art) Conventionally, as shown in Fig. 3, this type of one-way clutch has an input hub a rotatable by an external force, and an output hub b fitted so as to be rotatable. It is known that a coil spring C is wound around a shaft portion, and a hook portion C° formed at one end of the coil spring C is configured to be hooked to an input hub 8.

Therefore, in the above-mentioned clutch, when an external force as a rotational force is applied to the input hub d in the winding direction of the coil spring C, the coil spring C is wound around the outer periphery of the shaft portion (not shown) of the output hub b. The frictional force between the inner surface of the coil spring C and the outer periphery of the shaft is used to lock the input hub a and the output hub b, and the output is transmitted to the input hub d to rotate in the opposite direction to the winding direction of the coil spring C. By applying this, input hub d and output hub b become free, and no output is transmitted.

(Problem to be Solved by the Invention) However, in the above-mentioned clutch, the input hub a and the output hub b are locked using the frictional force between the inner surface of the coil spring C and the outer circumference of the shaft portion of the output hub b. At this time, a tensile force acts on the coil spring C itself, and therefore, in the event of an overload, the hook portion C' of the coil spring C bends and becomes unlatched from the input hub a.

Therefore, in order to solve the above problem, it has been considered to wind a coil spring C around the outer periphery of both the shaft parts (not shown) of the input hub d and the output hub b, as shown in Fig. 4. ,
In this case, if an overload is applied, the coil spring C may be cut off midway, or the input and output circular hubs a and b
If the coil spring C is wound around the coil spring C, the overall length becomes longer and there are problems such as a limited range of use.

The present invention was made in view of the above-mentioned problems of the conventional spring one-way clutch.
By press-fitting a tight coil spring into the shaft hole of the output hub, loosely inserting the input hub inside the coil spring, and hooking one end of the coil spring to the input hub, the input hub can be used to prevent the coil spring from winding. By rotating the coil spring in the opposite direction, the outer periphery of the coil spring and the inner periphery of the output hub come into contact, and the resulting frictional force creates a locked state. Conversely, when the input hub is rotated in the direction in which the coil spring is wound, , the coil spring and the output hub are made to idle, thereby eliminating bending of the hook that engages with the input hub and accidental disconnection of the coil spring in the event of an overload, and preventing the overall length from becoming too long, resulting in an efficient clutch. Its purpose is to enable the effect to be exerted.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a close coil spring that is press-fitted into a right circular shaft hole of an output hub, and an external force applied to the inside of the close coil spring. It is an object of the present invention to provide a one-way clutch using a spring, which is characterized in that a rotatable input hub is loosely inserted and one end of a close coil spring is hooked to the input hub.

(Function) Now, when an external force as a rotational force is applied to the input hub in the opposite direction to the winding direction of the close coil spring, the input hub is rotated, but this and one end of the close coil spring are latched. Because of this, the close coil spring rotates together with the input hub in the opposite direction to its winding direction, causing its diameter to expand and the outer circumference of the close coil spring bites into the inner circumference of the shaft hole of the output hub, causing the input hub to The output hub is locked via the close coil spring, and only the rotation of the input hub in one direction (the direction opposite to the winding direction of the close coil spring) is transmitted to the output hub.

At the time of locking, the force applied to the close coil spring and its one end is a compressive force, so that one end does not bend or the close coil spring is cut.

When an overload is applied to the input hub in the rotational direction, the close coil spring and the output hub idle, and when the overload is removed, the two immediately resume their original function due to their frictional contact.

In the above-mentioned locked state, when an external force is applied to the input hub as a rotational force in the winding direction of the close coil spring, one end of the close coil spring is rotated in the winding direction due to the rotation of the input hub, and the T : The diameter of the incoming coil spring is reduced, the locked state is released, and the close coil spring and the output hub are in a free state and rotate idly.

(Example) An example of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the output hub l is formed in a cylindrical shape, and a right circular shaft hole 1a is vertically penetrated through the center of the output hub l.

The close coil spring 2 is formed by tightly winding a wire rod made of spring steel material, and is formed by tightly winding a wire rod made of spring steel material, and is connected to the shaft hole 1a of the output l-branch 1.
In order to be able to be press-fitted into the shaft hole, its outer diameter D' is formed to be equal to the inner diameter of the shaft hole 1a, and one end (the lower end in the figure) is bent inward to form a hook portion 2a. The close coil spring 2 is attached to the output hub 1.
The shaft hole 1a is press-fitted into the shaft hole 1a.

The input hub 3 has a cylindrical shape, and its outer diameter d° is smaller than the inner diameter d of the close coil spring 2 by a required dimension, and its axial length is equal to the length of the output hub l. It is formed between roads.

In addition, a coil spring 2 is attached to the outer wall of the input hub 3.
A groove 3a for hooking the hook portion 2a is formed vertically from the upper end to the lower end, and the input hub 3 is loosely inserted into the inner side of the close coil spring 2 so as to be freely rotatable.

Here, there is a groove 3 on the outer periphery of the lower end of the input hub 3.
If a flange portion 3b is provided to protrude outward in the circumferential direction from one side of a to a required length, the lower end of the close coil spring 2 can be engaged on the flange portion 3b. The hook portion 2a can be held in the groove 3a without coming off downward.

A movable shaft 4 that applies a rotational force as an external force to the input hub 3 is fitted into a polygonal shaft hole 3c that penetrates through the center of the input hub 3.

In reality, only the rotation of the movable shaft 4 in one direction is
A rotating shaft (not shown) is used to transmit power to the output side.
It will be connected to the output hub 1 mentioned above.

Therefore, when the one-way clutch using the spring described above is used, for example, in a coat lift hanger, an external force acts on the movable shaft 4 as a rotational force, and the input hub 3 moves in the winding direction of the close coil spring 2. When it is rotated in the opposite direction, that is, in the direction of arrow e in FIG. It bites into the inner circumferential surface of the shaft hole 1a in the hub 1 and becomes locked, and rotation of the input hub 3 in the direction of arrow e is transmitted to the output hub l.

In the above locked state, the input hub 3 is connected via the movable shaft 4.
When an overload is applied to the coil spring 2, the outer circumference of the close coil spring 2 and the inner circumference of the output hub 1 slip, and the input hub 3 and the close coil spring 2 rotate idly, and rotational force is no longer transmitted to the output hub 1. When the load is removed, the original function is immediately restored, and the rotational force of the input hub 3 is transmitted to the output hub l.

When the input hub 3 is rotated by an external force via the movable shaft 4 in the opposite direction to that described above, that is, in the winding direction of the close fill spring 2 shown by arrow e in FIG. , that is, the outer diameter becomes smaller, and the output hub l
The frictional engagement with the inner circumferential surface of the coil spring 2 is released, the close coil spring 2 idles, and no rotational force is transmitted to the output hub 1.

(Effects of the Invention) Since the present invention is configured as described above, the external force acts on the input hub as a rotational force in the opposite direction to the winding direction of the close coil spring, causing the close coil spring to expand in diameter. However, the outer circumference of the close coil spring and the inner circumference of the output hub bite, resulting in a locked state. When this lock occurs, when the rotational force is transmitted from the input hub to the output hub, the force applied to the close coil spring is Since the force applied is compressive force, it solves the problem that even when an overload is applied, the tight coil spring breaks midway, or the hook part bends and becomes unlatched from the groove of the input hub. Not only that, but also the rotational movement utilizes the outer diameter of the tight coil spring, so it can be used as a lock as a clutch,
It is effective for lock release switching, and since it is only necessary to press fit the tight coil spring into the output hub, the overall length is kept down and does not become long, and its uses are wide-ranging.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an embodiment of a one-way clutch using a spring according to the present invention, FIG. FIG. 3 is a perspective view showing each one-way clutch. 1...Output hub 1a...Shaft hole 2...Fist...Tight coil spring...Input hub

Claims (1)

[Claims] A close coil spring is press-fitted into the right circular shaft hole of the output hub, an input hub that can be freely rotated by an external force is loosely inserted inside the close coil spring, and one end of the close coil spring is inserted into the input hub. A one-way clutch that uses a spring and is characterized by its latching feature.