JPH0495616A - One-way clutch - Google Patents

Abstract

PURPOSE:To reduce cost and size by arranging a ball between a ringged flat region which is orthogonalized with the rotational center of a first member and a cam surface forming region of a second member, and by providing a means for energizing the second member against the first member in the direction of the rotational center. CONSTITUTION:When a load on following side is of no more than a preset level, the point of a partition wall 4a of a member 4 on following side is put on a ringged flat surface 2b of a member on driving side, while a disc spring 14 is in a certain condition. Through the rotation of the member on driving side in a direction C, a ball 6 is energized by a plate spring 8 in the direction C, and is in a locked condition, while the driving force is transmitted to the member 4 on following side. When the member on driving side is rotated in a direction C', regardless of the energizing effect of the plate spring 8, the ball 6 is slid to the member on driving side, or to the member 4 on following side, and is thus in a free condition. When a load on following side exceeds a certain level, while the member on driving side is rotated in the direction C, the member 4 on following side is not rotated in the direction C, but is moved in the direction of a rotational center, and the disc spring 14 is deformed thereby, while the point of the partition wall 4 or the member 4 or following side is separated from the ringged flat surface 2b or the member on driving side, and a torque limit function is thus achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a one-way clutch, and more particularly to a one-way clutch with a torque limit function that is less prone to failure and lower in cost.

[Prior Art and Problems to be Solved by the Invention] One-way clutches are widely used in various machines as mechanical elements that transmit rotational driving force only in a specific direction.

Conventionally, as a one-way clutch, a plurality of small members are arranged between the inner ring and the outer ring for appropriate driving force transmission, and the first
For relative rotation in the second direction, the small member is locked between the inner and outer rings to transmit driving force (locked state), and for relative rotation in the second direction, the small member is locked. A device is used that releases the drive force so that no driving force is transmitted (free state).

However, with the conventional one-way clutch as described above,
In order to maintain good operating performance, strict precision is required for the coaxiality of the outer surface of the inner ring and the inner surface of the outer ring for locking the small drive force transmission member, and in order to maintain the coaxiality, extremely high strength is required. I needed to. For this reason, conventional one-way clutches have been expensive.

In addition, a torque limiter that limits the transmitted torque is sometimes used in the driving force transmission path using a one-way clutch, but conventionally, the torque limiter and one-way clutch are provided separately, so the driving force transmission system This was disadvantageous when downsizing.

Therefore, in view of the above-mentioned problems of the prior art, the present invention provides a low-cost one-way clutch that does not require the strict precision of the prior art but has fewer failures (operates well, is equipped with a torque limit function). The purpose is to

[Means for Solving the Problems] According to the present invention, in order to achieve the above objects, the second member is rotatable relative to the first member around a rotation center. The first member and the second member
Three or more balls are held on a circumference centered on the rotation center in a plane orthogonal to the rotation center between the second member and the second member, and the balls are held in the circle of the second member. The cam surfaces are arranged in isolation in predetermined areas on the circumference, each of which has a cam surface having the same pattern in a specific direction of the circumference, and the first member has a cam surface formed in the same pattern in a specific direction of the circumference. An annular plane area perpendicular to the center of rotation is provided, and the balls are arranged between the annular plane area and each cam surface forming area of the second member, and the balls are arranged in the direction of the center of rotation. A one-way clutch is provided, comprising means for biasing the second member toward the first member.

In the present invention, there is an aspect in which the means for biasing the second member toward the first member is a spring body.

In the present invention, there is an aspect in which the device includes means for adjusting the biasing force of the means for biasing the second member toward the first member.

In the present invention, there is an aspect in which the second member is provided with a partition wall for separating and holding the balls in predetermined areas.

Further, in the present invention, there is an aspect in which the device includes means for biasing each of the balls in a specific direction of the circumference.

[Example] Hereinafter, specific examples of the present invention will be described with reference to the following.

FIG. 1 is a partially omitted exploded perspective view showing an embodiment of a one-way clutch according to the present invention, FIG. 2 is a schematic sectional view of this embodiment, and FIG. 3 is a schematic sectional view thereof. Incidentally, FIG. 2 corresponds to a schematic cross-sectional view taken along the line ■-■ in FIG. 3.

In these figures, 2 is a drive-side member, which can be attached to a drive-side rotation shaft (the center of rotation is indicated by 1), which is not shown. The drive side member 2 constitutes the first member of the present invention.

The drive side member 2 has a flange portion 2a formed at one end. On the flange portion, an annular plane 2b orthogonal to the rotation center 1 is formed on a circular layer centered on the rotation center 1.

A bottle hole 2C is formed at the other end of the drive side member 2.

On the other hand, reference numeral 4 denotes a driven side member which is attached to the driving side member 2 so as to be rotatable around the rotation center 1. The driven side member constitutes the second member of the present invention.

The driven member 4 has a partition wall 4a formed facing the annular plane 2b of the drive member.

The partition walls are provided at equal intervals on the circumference around the rotation center 1. Further, a cam surface 4b is formed between two adjacent partition walls 4a. The cam surface has a shape that is inclined in the circumferential direction of the circumference centered on the rotation center 1, that is, it has a shape that gradually becomes higher in the direction C.

A gear 4C is formed on the outer periphery of the driven member 4, and can mesh with a driven gear (not shown).

One ball 6 having the same shape for transmitting driving force is arranged in a region corresponding to each of the cam surfaces 4b. Further, in each area, a leaf spring 8 is provided that biases the ball 6 in the direction C.
is located.

Reference numeral 10 denotes a ring member, which is attached to the drive side member 2 by press fitting. The ring member 10 has a bottle hole 10 at a position corresponding to the bottle hole 2C of the drive side member 2.
a are formed, and bottles 12 pass through these bottle holes to fix the drive side member 2 and the ring member 10.

A disc spring 1 is installed between the ring member 10 and the driven member 4.
4 is interposed, and the disc spring urges the driven member 4 toward the driving member 2 in the direction of the rotation center.

Next, the operation of this embodiment will be explained.

FIGS. 4(a) and 4(b) are schematic cross-sectional views for explaining the operation of this embodiment, and correspond to the IV-IV cross-section in FIG. 2 above.

FIG. 4(a) shows a case where the load on the driven side is less than a predetermined value. In this case, the disc spring 14 maintains its initial state, and the tip of the partition wall 4a of the driven member 4 is abutted against the annular plane 2b of the driving member 2. When the drive side member 2 rotates in the direction C, the ball 6 is biased in the direction C by the action of the leaf spring 8, so that the ball 6 is held between the annular plane 2b and the cam surface 4b. become. As a result, a locked state is achieved and the driving force is transmitted to the driven member 4. Moreover, when the driving side member 2 rotates in the Co direction, the ball 6 slips with respect to the driving side member 2 or the driven side member 4 regardless of the biasing action of the leaf spring 8. This results in a free state, and the driving force is no longer transmitted to the driven member 2.

FIG. 4(b) shows a case where the load on the driven side exceeds the predetermined value. In this case, when the drive side member 2 rotates in the direction C, the ball 6 moves in the direction C on the cam surface while being held between the annular plane 2b and the cam surface 4b. Here, since the load on the driven side is large, the driven side member 4 does not rotate in the direction C, but moves toward the center of rotation, deforming the disc spring 14. Thus, the tip of the partition wall 4a of the driven member 4 separates from the annular plane 2b of the driving member 2. Then, the ball 6 slips with respect to the driving member 2 or the driven member 4, so that the driving force is no longer transmitted to the driven member 2, and the torque limit function is realized. In addition, when the drive side member 2 rotates in the direction of Co, the above-mentioned FIG. 4(a)
This is the same as explained above.

In the above embodiment, the disc spring 14 is used as a means for biasing the driven member 4 toward the driving member 2, but in the present invention, the second member is biased toward the first member. As the means, other spring bodies or even hydraulically driven means can be used.

Further, in the above embodiment, the ring member 10 is fixed to the drive side member 2, and therefore the force that urges the driven side member 4 toward the drive side member 2 cannot be adjusted. The position of the rotation center in one direction can be adjusted, and in the present invention, the urging force of the means for urging the second member toward the first member can also be adjusted. As a means for this adjustment, for example, the ring member 10 is screwed to the drive side member 2, or the ring member 10 is pressed in the direction of the center of rotation by a hydraulic drive mechanism, and the hydraulic pressure is It is possible to use a device that adjusts the

Therefore, it is possible to provide a low-cost one-way clutch that has few failures (can operate well) even though it does not require strict manufacturing precision and does not have very high strength.

Further, according to the one-way clutch of the present invention, since the means for urging the second member toward the first member in the direction of the center of rotation is provided, a torque having a characteristic corresponding to the urging force of the urging means is generated. Since it has a limit function and has a torque limiter built into the one-way clutch, it is advantageous when downsizing the driving force transmission system.

[Effect of the Invention J As described above, according to the one-way clutch of the present invention, the first member is provided with an annular plane area perpendicular to the center of rotation, and the second member is provided with a cam surface in a predetermined area. , Since the poles are placed at these openings, even if an impact occurs during the transmission of driving force, it can be absorbed by the relative movement of the first member and the second member in the axial direction.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted exploded perspective view showing an embodiment of a one-way clutch according to the present invention, Fig. 2 is a schematic cross-sectional view of the present embodiment, and Fig. 3 is a schematic cross-sectional view taken along the line m-m. . FIGS. 4(a) and 4(b) are schematic sectional views for explaining the operation of this embodiment. 1: b 6: Center of rotation, : Annular plane, : Partition wall, Ball, : Ring member, 2: Drive side member, 4: Driven side member, 4b = Force surface, 8: Leaf spring, 14: Belleville spring . Figure 4 (0) Dimension "0" gland

Claims (5)

[Claims] (1) A second member is arranged to be rotatable relative to the first member around a rotation center, and the rotation center is located between the first member and the second member. three or more balls are held on a circumference centered on the rotation center in a plane orthogonal to the second member, and the balls are isolated in predetermined areas on the circumference of the second member. A cam surface having the same pattern in a specific direction of the circumference is formed in each of the regions, and the first member has an annular planar region orthogonal to the rotation center. The balls are arranged between the annular plane area and each cam surface forming area of the second member, and the balls are arranged between the second member and the first member in the direction of the rotation center. A one-way clutch characterized by comprising means for biasing toward a member. (2) The one-way clutch according to claim 1, wherein the means for biasing the second member toward the first member is a spring body. (3) The one-way clutch according to claim 1, further comprising means for adjusting the urging force of the means for urging the second member toward the first member. (4) The one-way clutch according to claim 1, wherein the second member is provided with a partition wall for separating and holding the balls in predetermined areas. (5) The one-way clutch according to claim 1, further comprising means for biasing each of the balls in a specific direction of the circumference.