JPH04191535A - One way clutch and transmitting device having built-in one way clutch - Google Patents

Abstract

PURPOSE:To make the engaging and disengaging actions of a clutch certain by accommodating a roller made of magnetic substance in a wedge-shaped space between a cam formed on the inner peripheral face of an outer ring and a rotary shaft, and providing a magnet unit formed of magnet pieces arranged on the side of the narrower part of the wedge-shaped space. CONSTITUTION:A cam face 9 is formed on the inner peripheral face of the outer ring 8 of an one way clutch accommodated together with a plug body 4 in the clutch accommodating section 3 of a bearing sleeve 2, and a fitting recess 10 for locking magnet pieces 13 is formed between the inner peripheral face of the outer ring 8 and the cam face 9. A roller 11 made of magnet substance is accommodated in a wedge-shaped space between the cam face 9 and the outer peripheral face of a rotary shaft 1, and a magnet unit 12 formed of the magnet pieces 13 arranged adjacently to the side of the narrower part of the wedge-shaped space and an engaging protrusion 13a fitting in the engaging hole 16b of a connecting plate 16 is arranged there. In addition to that, an annular plate 15 is abuttedly fitted to the connecting ring 14 of the magnet unit 12, and connected to the tip side of the magnet pieces 13 through the connecting plate 16. Thus the roller can adhere closely to the outer peripheral face of a rotary shaft 1 in a line contact state to make the engaging and disengaging action of the clutch certain.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention is directed to a wedge-shaped gap provided at a plurality of locations in the circumferential direction between both the inner and outer wheels. A one-way clutch configured to engage a clutch by drawing a housed magnetic roller into the narrow part of a wedge-shaped gap using a magnet piece placed adjacent to each gap, and a transmission incorporating this one-way clutch. Regarding equipment.

(Prior Art) The inventor of the present application previously developed a one-way clutch using the above-mentioned magnet and filed a patent application for the same as Japanese Patent Application No. 1983-71950.

This one-way clutch has a plurality of small columnar magnet pieces arranged in a cylindrical shape adjacent to each wedge-shaped gap, and the base ends of each piece are integrally connected by a connecting ring, so that the magnet pieces can be assembled into the clutch. This makes it easier.

This one-way clutch is housed in a cylindrical casing, and its inner ring (rotating shaft) is supported by bearings attached to both ends of the cage.

In addition, Utility Model Publication No. 60 39541 eliminates the need to separately assemble the bearing for the rotating shaft by attaching bearing rings that serve as bearings for the rotating shaft (inner ring) to both end faces of the outer ring. A one-way clutch with the same configuration is shown.

(Problems to be Solved by the Invention) The above-mentioned one-way clutch, which was previously filed by the inventor of the present application, is shown in FIG.
As shown in Fig. 2, gears and pulleys are integrally formed on the outer periphery and fitted into the inner cavity of a hard synthetic resin bearing cylinder, and a synthetic resin plug is fitted into the opening at the end of the cylinder. Accordingly, a kind of simple power transmission device'' can be provided at low cost.

However, due to the precision of molding and assembly of the synthetic resin bearing sleeve and plug body, this transmission device has a one-way clutch built into the bearing sleeve, and the rotating shaft passes through the bearing sleeve. Both axes of the rotary shaft and the stopper, which has a shaft hole through which it passes, are likely to become eccentric, even if only slightly.

If this happens, the axes of the rotating shaft and each roller, which should originally be in a parallel state, will be tilted, and the rollers will not come into close contact with the outer circumferential surface of the rotating shaft, making it impossible to engage and disengage the one-way clutch. It becomes certain.

Therefore, an object of the present invention is to house a one-way clutch equipped with rollers for engaging and disengaging the clutch in the inner space of a bearing tube made of hard synthetic resin and having rotational force transmitting parts such as gears and pulleys on the outer periphery. It has a structure in which a synthetic resin plug is fitted into the housing opening, and even if the molding precision and assembly precision of the bearing sleeve and plug are not sufficient, the engagement and disengagement of the clutch will be uncertain. To provide a one-way clutch and a transmission device incorporating this one-way clutch, which is configured so as not to cause the problem.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the one-way clutch according to the present invention includes: an outer ring 8 having a plurality of cam surfaces 9 formed in the circumferential direction on the inner peripheral surface; The rotary shaft 1 is inserted into the inner cavity of the outer ring 8, and a plurality of wedge-shaped gaps a formed between the respective cam surfaces 9 and the outer circumferential surface of the rotary shaft 1 are filled with magnetic material. A roller 11, a plurality of magnet pieces 13 disposed in a cylindrical shape in contact with each narrow portion side of the plurality of wedge-shaped gaps a, and a connecting ring 14 that integrally connects each base end side of the magnet pieces 13. Magnet unit I consisting of
12, an annular plate 15 made of hard synthetic resin that is coaxially attached to the connecting ring 14 and has a shaft hole 15a through which the rotating shaft 1 is inserted; and the plurality of cylindrically arranged magnets. a plurality of engagement holes 161 which are respectively fitted into the engagement protrusions 13a provided on the end face of each tip end of the piece 13; and a central shaft hole 1 into which the rotating shaft 1 is inserted.
6a, and a connecting plate 16 made of hard synthetic resin that connects the tips of the plurality of magnet pieces 13 to each other.

Further, the transmission device according to the present invention has a cylindrical shape, and has shaft holes 5 and 7 at both ends thereof through which the rotating shaft 1 is inserted, and a rotational force transmission portion 6 consisting of gears, pulleys, etc. on the outer peripheral surface thereof. a bearing sleeve 2 made of hard synthetic resin and having a clutch accommodating portion 3 in its inner cavity; a plug body 4 fitted into an accommodating opening of the clutch accommodating portion 3 that opens at the cylinder end of the bearing sleeve 2; The one-way clutch A according to claim 1 is inserted into the clutch accommodating portion 3.

A gap may be provided between the outer circumferential surface of the one-way clutch A and the inner circumferential surface of the clutch accommodating portion 3.

(Function) The magnet unit 12 has a configuration in which a plurality of magnet pieces 13 are protruded from one side of the connecting ring 14 in a cylindrical arrangement. Since they are connected to each other, their structural strength is sufficiently strengthened.

The rotating shaft 1 is connected to an annular plate 15 that is not coaxially attached to the connecting ring 14 of the magnet unit 12, which has increased structural strength, and a central shaft hole 15 of the connecting plate 1G.
8.11ia is inserted.

Further, a gap is provided between the outer circumferential surface of the one-way clutch A and the inner circumferential surface of the clutch accommodating portion 3 to allow the one-way clutch A to be displaced in accordance with the inclination of the rotating shaft 1. There is.

Therefore, due to the molding accuracy and assembly accuracy of the synthetic resin bearing tube 2 and plug body 4 that accommodate the one-way clutch A,
Even if the respective axes of the rotating shaft 1 and the stopper 4 are slightly eccentric in the assembled state of the transmission, each roller 11 interposed between each magnet piece 13 constituting the magnet unit 12 and the rotating shaft 1 means that the respective axes are kept correctly parallel to each other, so that the close contact between them is not impaired, and the engagement and disengagement of the clutch is always performed reliably.

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

First, in FIG. 2 showing the overall configuration of the transmission device, the one-way clutch A has its rotating shaft mounted in a clutch accommodating portion 3 formed at one end side of a bearing sleeve 2 made of hard synthetic resin and having a predetermined length. 1 is housed in a state aligned with the axis of the bearing sleeve 2.

The clutch accommodating portion 3 is provided with an annular recess 3a on the inner circumferential surface near the accommodating opening thereof, and protrusions 3b are provided at six locations on the inner circumferential surface at equal intervals in the circumferential direction. It is installed in the axial direction.

4 is a one-way clutch A stored in the clutch housing part 3
The stopper is made of synthetic resin and prevents the clutch from slipping out of the accommodation opening, and has an annular protrusion 4a provided on its outer circumferential surface that is press-fitted into the annular recess 3a of the clutch accommodation portion 3.

The plug body 4 is provided with a concentric shaft hole 5 through which the rotating shaft 1 is inserted.

A gear 6 serving as a rotational force transmission part is integrally formed on the outer circumferential surface of the other end of the bearing cylinder 2, and a shaft hole 1 into which the rotating shaft 1 is inserted is provided at the cylinder end. The bearing sleeve 2 is made of a so-called engineering plastic having high toughness, such as nylon resin or polyamide resin.

Next, the detailed structure of the one-way clutch A will be explained with reference to the drawings.

In Fig. 1.8, 8 is an outer ring, on its inner circumferential surface, a plurality of cam surfaces 9 are formed at equal intervals in the circumferential direction, and between adjacent cam surfaces 9, 9, as will be described later, A plurality of four fitting parts 1o are provided to lock the back side of the magnet piece 13 in a fitted state.

When the rotating shaft 1 is inserted into the inner space of the outer ring 8, a wedge-shaped gap a is formed between each cam surface 9 and the outer peripheral surface of the rotating shaft 1. The outer circumferential surface of the outer ring 8 is provided with six four stripes 8a in the axial direction, into which the protrusions 31 provided on the inner circumferential surface of the clutch accommodating portion 3 are fitted. In addition, in FIG. 8, the concave strip 8a
illustration is omitted.

Reference numeral 11 denotes a roller made of a magnetic material housed in each wedge-shaped space a, and serves to bring the rotating shaft 1 and the outer ring 8 into frictional engagement.

Reference numeral 12 denotes a magnet unit, which serves as a biasing means for attracting the roller 11 toward the narrow part of the wedge-shaped space a. The magnet units 1 to 12 consist of six magnet pieces 13 each having a small columnar shape with a substantially trapezoidal cross section and each base of these magnet pieces 13, which are arranged in contact with the narrow side of each wedge-shaped gap a. It is configured as a connecting ring 14 that connects the end sides together. In this case, the magnet unit 12 is made by injection molding plastic mixed with a magnetic material, and each magnet piece 13 has a side wall surface in contact with the narrow side of the wedge-shaped gap a magnetized.

Furthermore, a small cylindrical engagement protrusion 13a is provided on the end face of each magnet piece 13 on the distal end side.

Reference numeral 15 denotes an annular plate that is fitted into contact with the outer surface of the connecting ring 14, and has a center hole 15. is a shaft hole into which the rotating shaft 1 is inserted. The annular plate 15 made by injection molding of synthetic resin has six push-fit type locking pawls 15b that are locked to the inside surface of the connecting ring 14 on the inner circumferential surface of the annular plate 15, which is made by injection molding synthetic resin. 13. It is integrally provided so as to be located between 13 and 13. A fitting groove 14a (FIG. 3) into which the annular plate 15 is fitted is provided around the outer surface of the connecting ring 14 along its inner circumference.

Reference numeral 16 denotes an annular connecting plate that connects the distal ends of the cylindrically arranged magnet pieces 13 to each other, and is provided with a shaft hole 1ga through which the rotating shaft 1 is inserted.

In the circumferential direction of the connecting plate 16, there are engagement holes 161 into which the engagement protrusions 13a are fitted, at locations corresponding to the engagement protrusions 13a that do not protrude from the tip side end surface of each magnet piece 13. The outer periphery of the five-pronged connecting plate 16 is formed into an uneven shape corresponding to the shape of the inner periphery of the outer ring 8.

Next, the operation of the above configuration will be explained.

The one-way clutch A assembled in the state shown in FIGS. 3 and 8 is not inserted into the clutch accommodating part 3 of the bearing sleeve 2 as shown in FIG. By making use of the elasticity of the material and fitting them together, a type of transmission device B with a built-in one-way clutch A can be assembled easily and quickly.

In this assembled state, the outer ring 8 of one-way clutch A
The inner diameter of the clutch accommodating part 3 is set so that only some gap remains between the outer peripheral surface of the clutch accommodating part 3 and the inner peripheral surface of the clutch accommodating part 3.

In this transmission device B, the outer peripheral surface of the bearing sleeve 2 is supported by a bearing (not shown), and a gear 6 formed on the outer peripheral surface of the bearing sleeve 2 is connected to a driven or driving side gear (not shown) at one end of the bearing sleeve 2. is engaged with.

When the rotating shaft 1 is rotated in the direction of arrow F by a drive device (not shown) as shown in FIG. The rollers 11 are rolled as the rotating shaft 1 rotates, and are instantly caught between the cam surface 9 and the outer peripheral surface of the rotating shaft 1, so that the outer ring 8 is integrated with the rotating shaft 1. The one-way clutch A becomes engaged.

Then, when the rotating shaft 1 is rotated in the direction opposite to the arrow F, the rotating shaft 1 moves each roller 11 through the wedge-shaped gap a due to the contact friction force that exceeds the magnetic attraction force because the magnet piece 13 does not reach each roller 11.
The outer ring 8 is disengaged from the rotating shaft 1, and the one-way clutch is disengaged.

However, the synthetic resin bearing sleeve 2 and plug body 4 that constitute the transmission device B are difficult to obtain sufficient molding dimensional accuracy, and the plug body 4 has a high elasticity. Using bearing tube 2
Since the plug is fitted into the receiving hole opened on the end face of the plug, there may be some looseness at the fitting location, and the shaft hole 5 of the plug 4 may not be aligned with the axis of the bushing 2. On the other hand, it is easy to become eccentric.

In that case, if the one-way clutch A is fitted into the inner surface of the clutch housing part 3 with close contact, the rotating shaft 1
As the axis of the roller 11 is tilted with respect to the axis of the bearing sleeve 2, the axis of the roller 11 is tilted with respect to the axis of the rotating shaft 1, and the roller 11 and the rotating shaft 1, which should be in line contact, are , attempts to reach an unstable point contact state. However, when the one-way clutch A is about to be displaced as the rotating shaft 1 is tilted, a large stress is applied to the one-way clutch A that is tightly fitted in the clutch accommodating portion 3. become.

However, in the transmission device B of this embodiment, a gap 1) is intentionally provided between the outer circumferential surface of the outer ring 8 and the inner circumferential surface of the clutch accommodating portion 3, and a protrusion is provided on one side of the connecting ring 14. The tips of the small columnar magnet pieces 13 in the installed state are connected to each other by a connecting plate 16 so that the cylindrical arrangement is not disturbed, and a shaft hole 15a through which the rotating shaft 1 is inserted.
, 11ia, and the connecting plate 16 serve to align the respective axes of the magnet unit 12 and the rotating shaft 1.

Therefore, even if the one-way clutch A is assembled into the bushing 2 with the axis of the rotating shaft 1 slightly inclined with respect to the axis of the bushing 2, the one-way clutch A will The rotating shaft 1 and each roller 11 are displaced according to the inclination of the rotating shaft 1, so that the parallel state of their axes is not impaired, and the one-way clutch A is always engaged and disengaged reliably.

Therefore, for example, when this transmission device B is used in a paper feeding mechanism of a document copying machine, there is no possibility that a serious failure such as malfunction of the paper feeding operation due to malfunction of the clutch will occur.

In the above embodiment, the annular plate 15 is not limited to the shape shown in the drawings; for example, the latching pawl 15b is omitted, and instead, the annular plate 15 and the connecting ring 14 are provided with projections and depressions for fitting and latching, respectively. Alternatively, the annular plate 15 may be bonded to the connecting ring 14.

Furthermore, the configuration of the bearing sleeve 2 of the transmission unit MB depends on the usage of the transmission device B, such as the location where the gear is formed, the type of gear, the size of the pulley formed in place of the gear, and the length of the bearing sleeve 2. The object of the present invention can be achieved even if it is modified appropriately depending on the above.

[Effects of the Invention] As is clear from the above explanation, according to the one-way clutch of the present invention and the transmission device incorporating the one-way clutch, the forming accuracy of the bearing sleeve and the plug body or the assembly accuracy of the transmission device can be sufficiently improved. Even if this is not possible, the rollers responsible for engaging and disengaging both the inner and outer wheels can be kept in close line contact with the outer circumferential surface of the inner ring (rotating shaft) at all times. This has an excellent practical effect in that deactivation is always performed reliably.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is an exploded perspective view of a transmission device, FIG. 2 is a vertical sectional view of the transmission device, FIG. 3 is a vertical sectional view of a one-way clutch, and FIG. 4 is a vertical sectional view of the one-way clutch. A plan view of the connecting plate, FIG. 5 is a sectional view taken along the line XX in FIG. 4, FIG. 6 is a plan view of the annular plate, FIG. 7 is a sectional view taken along the Y-Y line in FIG. 6, and FIG. It is a front view of a one-way clutch. Code Table 1 Rotating shaft 2 Bearing sleeve 3 Clutch housing 3a Annular recess 3b Convex strip 4 Plug 5 Shaft hole 6 Gear (transmission part) 1 Shaft hole
8 Outer ring 9 Cam surface 10 Fitting recess 11 Roller 12 Magnet unit 13 Magnet piece 13a Engagement protrusion 14 Connection ring 14
a Fitting groove 15 Annular plate 15a Shaft hole 15b Engagement claw 16 Connection plate = 16- 16a Shaft hole 11ib Engagement hole A One-way clutch B Transmission device a Wedge-shaped gap b Gap

Claims (3)

[Claims] (1) An outer ring 8 in which a plurality of cam surfaces 9 are formed in the circumferential direction of the inner circumferential surface, a rotating shaft 1 inserted into the inner cavity of the outer ring 8, and a rotation shaft 1 between each of the cam surfaces 9 and the rotating shaft 1. rollers 11 made of a magnetic material, respectively housed in a plurality of wedge-shaped gaps a formed between the plurality of wedge-shaped gaps a, and a plurality of magnets arranged in a cylindrical shape in contact with each narrow side of the plurality of wedge-shaped gaps a. a magnet unit 12 consisting of a piece 13 and a connecting ring 14 that integrally connects the proximal ends of the magnet pieces 13; a magnet unit 12 that is coaxially attached to the connecting ring 14 and allows the rotating shaft 1 to pass therethrough; An annular plate 15 made of hard synthetic resin provided with an axial hole 15a, and a plurality of engagement projections 13a provided on the end faces of the plurality of cylindrically arranged magnet pieces 13, respectively. A mating hole 16b and a central shaft hole 16 through which the rotating shaft 1 is inserted.
A one-way clutch comprising: a connecting plate 16 made of hard synthetic resin that connects the distal ends of the plurality of magnet pieces 13 to each other; (2) It has a cylindrical shape, and has shaft holes 5 and 7 at both ends through which the rotating shaft 1 is inserted, and a rotational force transmission part 6 consisting of gears, pulleys, etc. is provided on the outer circumferential surface of the cylinder, and the inner space is A bearing sleeve 2 made of hard synthetic resin and provided with a clutch housing portion 3; A plug body 4 fitted into a housing opening of the clutch housing portion 3 that opens at the cylinder end of the bearing sleeve 2; An inside of the clutch housing portion 3. A transmission device incorporating a one-way clutch comprising the one-way clutch A according to claim 1, which is inserted into the one-way clutch A according to claim 1. (3) A transmission device incorporating the one-way clutch according to claim 2, characterized in that a gap b is provided between the outer circumferential surface of the one-way clutch A and the inner circumferential surface of the clutch accommodating portion 3. .