JPH0374639A - One-way clutch - Google Patents

Abstract

PURPOSE:To facilitate the assembling work and make the axial size compact by storing locking pieces made of a plate circularly arranged and stacked in sequence with multiple pieces formed in a nearly circular shape in an outer ring, forming cam faces corresponding to pieces on the inner periphery of the outer ring, and providing spring members operating the pieces of locking pieces on cam faces in the outer ring. CONSTITUTION:Three locking pieces 11, 12 and 13 formed with a thin metal plate or the like by press molding are the same, pieces 17 formed in a nearly circular shape are arranged at three points at a uniform interval on the same circumference, pieces 17 are connected by a circular arc-shaped connection section 18 into a ring shape, and a recessed section 19 is provided at one side of the outer periphery of each piece 17. The inner periphery of an outer ring 14 storing the overlapped locking pieces 11, 12 and 13 inside is formed in a polygonal shape continued with cam faces 22 corresponding to pieces 17, and pieces 17 are located between the outer periphery of a shaft 21 and cam faces 22. A cover member 15 is formed in a disk shape with the inner diameter externally coupled with the shaft 21 and the outer diameter nearly equal to the outer diameter of the outer ring 14, and spring members 23 with the same number as pieces 17 are protruded on the inner face of the outer ring 14 faced to the inside.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a one-way clutch.

[Conventional technology]

For example, a conventional low-torque one-way clutch used for paper feeding in office automation equipment, etc. has a plurality of pockets 2 provided at regular intervals on the inner peripheral surface of an outer ring 1, as shown in FIG.
A roller 3 is housed in each pocket 2, and a spring piece 5 is provided on a presser foot 14 that closes one end of the outer ring 1 to press each roller 3 in the direction of biting into the cam surface 2a of the pocket 2. It has a structure in which the other end side is closed with an external resin part 6.

The one-way clutch as described above transmits rotation in the direction in which the roller 3 bites into the cam surface 2a, and idles in the opposite direction.

Incidentally, office automation equipment that incorporates and uses one-way clutches as described above is trending toward miniaturization, and for this reason, it is necessary to make the axial dimensions of one-way clutches more compact.

[Problem to be solved by the invention]

However, in order to shorten the axial dimension of a one-way clutch with the structure described above, the length of the roller 3 is shortened (this reduces the stability of the roller 3 in the pocket 2, and makes it difficult to assemble the clutch when assembling the clutch). There is a problem in that it is difficult to make the axial dimension more compact due to the poor performance.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, it is an object of the present invention to provide a one-way clutch that is easy to assemble and has a compact axial dimension.

[Means to solve the problem]

Like above! In order to solve this problem, this invention stores a locking piece made of a plate in which a plurality of roughly circular pieces are arranged in a circular manner and connected in sequence in an outer ring. A corresponding cam surface is formed, and a spring member is provided inside the outer ring to cause the locking piece to act on the cam surface.

[Effect]

The lock piece is located between the shaft inserted into the lock piece and the cam surface of the outer ring, and each piece is pressed in the direction of biting into the cam surface, so the rotation in the direction in which the piece bites into the cam surface is transmitted, and the rotation in the opposite direction It spins idly.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5 of the accompanying drawings.

The first embodiment shown in FIGS. 1 to 3 includes three lock pieces L12 and 13 formed in the shape of a brace bottom using thin metal plates, an outer ring 14 that stores the lock pieces inside, A lid member 15 that closes one end of the outer ring 14
and an external resin part 16 that closes the other end of the outer ring 14.

The above-mentioned lock pieces 11, 12, and 13 are all equal, and three pieces 17 formed in a substantially circular shape are arranged at equal intervals on the same circumference, and each piece 17 is connected by an arc-shaped connecting part 18 to form a ring shape. Each piece 17 is provided with a concave notch 19 on one side of its outer periphery.

As shown in FIG. 1, each lock piece 1L12.13 is overlapped with a phase shift in the circumferential direction so that each piece 17 is arranged at equal intervals in a coaxial state. .12.13 is assembled inside the outer ring 14 with a ring-shaped spacer 20 interposed between the overlapping surfaces of the lock pieces 11, 12, and 13, and the shaft 21 is inserted inside the lock pieces 11, 12, and 13 groups.

Lock piece 11.12.13 in the above-mentioned overlapping state
The inner circumferential surface of the outer ring 14, which accommodates the cam surface 22 inside, is formed into a polygonal shape in which each piece 17 and the corresponding cam surface 22 are continuous, and each piece 17 is located between the outer periphery of the shaft 21 and the cam surface 22. .

The lid member 15 is formed into a disk shape with an inner diameter that is fitted onto the shaft 21 and has an outer diameter that is approximately equal to the outer diameter of the outer ring 14. On the inner surface facing inside the outer ring 14, a number of spring members 23 equal to the number of pieces 17 are provided. is installed protrudingly.

As shown in FIG. 1, each spring member 23 engages with a recessed part 19 of the piece 17 at a corresponding position, and presses the piece 17 in a direction that bites into the cam surface 22.

Therefore, each piece 17 acts in a locking direction with respect to the wedge-shaped interval formed by the outer peripheral surface of the shaft 21 and the cam surface 22.

The external resin component 16 extends from the other end surface of the outer ring 14 to the outer ring 14.
The groove 24 and the lid member 1 are formed to integrally cover the outer peripheral surface of the outer ring 14 and the outer peripheral surface of the lid member 15.
By filling in the positioning protrusion 25 protruding from the outer periphery of the outer ring 14 and the lid member 15, the outer ring 14 and the lid member 15 are integrated in the rotational direction.

Note that, on the inner surfaces of the lid member 15 and the outer resin component 16 facing into the outer ring 14, projections 26.
27 is provided, and the outer ring 14 is not limited to a roller shape as shown in the figure, but the outer periphery may be formed into a rotation transmitting member such as a boob or a gear.

The first embodiment of the present invention has the above-mentioned configuration, and lock pieces 11, 12, 13 housed in the outer ring 14 are connected to the ring 2.
When the shaft 21 is rotated counterclockwise in the direction shown by the arrow A) in FIG. 1, each lock piece 11.12
．． The pieces 17 of No. 13 move in the direction of biting into the cam surface 22 and become locked, thereby locking the outer ring 14 and the external resin part 16.
rotate in the same direction.

Furthermore, when the shaft 21 rotates in the direction of the hour hand in FIG. First, the shaft 21 will idle.

Next, a second embodiment shown in FIGS. 1 and 5 will be described. Note that the same parts as in the first embodiment shown in FIGS. 1 to 3 are designated by the same reference numerals, and the description thereof will be omitted.

This second embodiment is constructed using -number of lock pieces 31, and the axial dimension is shorter than that of the first embodiment.

That is, the lock piece 31 has a number of pieces 17 equal to the total number of pieces 17 provided on the three lock pieces 3112 and 13 shown in the first embodiment arranged at equal intervals on the same circle, and The pieces 17 are connected by a connecting part 18 to form a ring shape, and are press-molded from two metal plates.

As shown in FIG. 4, each lock piece 31 is
7 is incorporated into the outer ring 14 so as to correspond to the cam surface 22,
A spring member 23 presses the top 17 to act on the cam surface 22.

Therefore, when the shaft 21 rotates counterclockwise in FIG. 4 (arrow A in the figure), the top 17 becomes locked, the rotation is transmitted to the outer ring 14, and the shaft 21 rotates clockwise in the figure (arrow B in the figure).
), the lock is released and the shaft 21 rotates idly.

〔effect〕

As described above, according to the present invention, a locking piece made of a plate in which a plurality of pieces are arranged in a circular shape is formed with a cam surface corresponding to the pieces on the inner peripheral surface of the outer ring, and the pieces are attached to the cam surface by a spring member. Since this is made to work, the outer ring can be shortened to a length corresponding to the thickness of the lock piece, and the axial dimension of the clutch can therefore be made significantly more compact.

Further, since the lock piece is formed in a ring shape, it is easy to assemble into the outer ring when assembling the clutch, and the assembling work can be performed easily and efficiently.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view showing a first embodiment of the one-way claft according to the present invention, FIG. 2 is a longitudinal sectional side view of the same, FIG. The figure is a longitudinal sectional front view showing the second embodiment, FIG. 5 is a perspective view of a locking piece used in the same, and FIG. 6 is an exploded perspective view showing a conventional one-way clutch. 11.12.13.31...Rock piece, 14
...Outer ring, 16...External resin part, 18...Connecting portion, 22...Cam surface, 15...Lid member, 17 .....piece, 21..shaft, 23..spring member.

Claims (1)

[Claims] (1) A lock piece made of a plate made of a plurality of roughly circular pieces arranged in a circle and connected one after another is housed in an outer ring, and a cam surface corresponding to each piece is formed on the inner peripheral surface of this outer ring. , a one-way clutch in which a spring member is provided inside the outer ring for causing a locking piece to act on a cam surface.