JPH08159165A - Ball bearing built in with one-way clutch - Google Patents

Abstract

PURPOSE: To form a bearing unit into compactness by providing a holder formed with a packet in a plurality of parts in a circumferential direction, clutch piece received in each pocket to be capable of coming into contact with an inner ring external diametric surface and with an outer ring internal diametric surface and a plurality of spring members of energizing the clutch piece in a prescribed direction. CONSTITUTION: A clutch part assembly unit 4 is provided in both sides of a row of rollers 3 between inner/outer rings 1, 2, to constitute the clutch part assembly unit 4 of a cage 5, clutch piece 6 and a spring member 7. In the cage 5, a columnar part 5c is integrally provided between side rings 5a, 5b, to form a pocket 10 in a plurality of parts in a peripheral direction, and both axial/rotational directions are fixed to the outer ring 2. The clutch piece 6 is a sprag shape contactable with an external diametric surface of the inner ring 1 and an internal diametric surface of the outer ring 2 and received in the pocket 10, and the spring member 7 energizes the clutch piece 6 in a prescribed direction. Since the clutch piece 6 is pressed by the spring member 7 to come into contact with the inner/outer rings 1, 2, one-way relative rotation is impeded, to make rotatable only in a reverse direction. Accordingly, a number of part items is reduced to attain forming into compactness in a width direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball bearing with a built-in one-way clutch, which is used, for example, in a reverse rotation preventing mechanism of a fully automatic washing machine, a general industrial machine having a comparatively light torque load, and the like.

[0002]

2. Description of the Related Art One-way clutches and bearings are generally manufactured as independent products. However, they are often used in combination in various industrial machines. May be provided. For example, in a reverse rotation preventing mechanism of a fully automatic washing machine, a clutch and a bearing are arranged adjacent to each other. In such applications of adjacent arrangement, a bearing with an integrated clutch may be used for the purpose of downsizing the mechanism and reducing the number of parts.

FIG. 4 shows an example of a conventional ball bearing with a built-in one-way clutch. In this example, the one-way clutch 51
And the ball bearing 52 are arranged side by side in the axial direction, and the inner ring 53 is shared by the one-way clutch 51 and the ball bearing 52. As the outer rings 54 and 55, independent one-way clutches 51 and ball bearings 52 are used. The one-way clutch 51 has rollers 56, as shown in the cross section of FIG.
Is pressed against the cam surface 54a of the outer ring 54 and the inner ring 53 by a spring 57, and rotation in the opposite direction is blocked by the wedge effect generated between the roller 56, the cam surface 54a, and the inner ring 53. As a ball bearing with a built-in one-way clutch of this type, for example, there is one disclosed in Japanese Patent Publication No. 6-23579.

A clutch 51 and a ball bearing 5 are of this type.
Although there is an advantage that 2 and 1 can be designed independently, on the other hand, since the outer rings 54 and 55 are provided separately, the dimension in the axial direction becomes long and the number of parts also increases. Both outer rings 54,5
One-way clutch 51
Since the outer ring 54 has a cam surface 54a on the inner diameter surface, it is difficult to manufacture because it is necessary to machine the cam surface 54a and the raceway groove 55a of the bearing 55 into the same component.

In order to solve such a problem, the inventor of the present invention has considered using a sprag type one-way clutch integrated with a bearing in which a cam surface is not required to be formed on a bearing ring. However, a general sprag-type one-way clutch is, as shown in FIG.
The inner cage 6 is used to hold the sprag pieces 63 arranged between them.
4 and the outer cage 65, the inner and outer cages 64, 65
Since a ring-shaped leaf spring 66 for urging the sprag piece 63 is interposed therebetween, a large gap is required between the inner and outer races 61 and 62 to secure the strength of the cages 64 and 65. . Therefore, it is difficult to share the inner and outer rings 61 and 62 with the inner and outer rings of the ball bearing.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a ball bearing with a built-in one-way clutch, in which the number of parts can be reduced, the size can be reduced, and the production can be facilitated.

[0007]

In the ball bearing with a built-in one-way clutch of the present invention, a clutch component assembly is provided between the inner ring and the outer ring of the ball bearing on both sides of the rolling element row. . These clutch component assemblies are composed of a retainer, a clutch piece, and a spring member. The cage is one in which a pillar portion is provided between a pair of side wheels and pockets are formed at a plurality of circumferential positions. The clutch piece has a sprag shape that can contact the outer diameter surface of the inner ring and the inner diameter surface of the outer ring, and is housed in each pocket of the cage. The spring member biases each clutch piece in a predetermined direction, and is provided for each clutch piece. The cage in the clutch component assembly has the outer diameter of the side ring on one side formed larger than the inner diameter surface of the outer ring, and the positioning groove is formed on the inner diameter surface of the outer ring to form the outer diameter of the side ring on the larger diameter side. The parts may be fitted together. Further, when the clutch piece is made compact in the axial direction, it is preferable that the clutch piece has a narrow width dimension in the axial direction with respect to a height dimension in the bearing radial direction.

[0008]

According to this structure, since the sprag-shaped clutch piece in each clutch component assembly is pushed by the spring member to contact the inner ring and the outer ring, relative rotation of the inner ring and the outer ring in one direction is prevented, and the other direction is reversed. Only can be rotated. Also,
A radial load or the like between the inner and outer rings is supported via the rolling elements of the ball bearing. In this way, in the one-way clutch part,
Since the sprag-shaped clutch pieces are used, it is not necessary to form cam surfaces on the inner ring and the outer ring, and both sides of the raceway groove of the inner and outer rings in the ball bearing can be used as the contact portions of the clutch pieces. As a result, it is easy to make it compact, and the outer ring dedicated to the clutch is unnecessary, and the number of parts is reduced. Since the clutch component assemblies are provided on both sides of the row of rolling elements, the required braking torque can be obtained even if each of them has a narrow width.
Furthermore, since the clutch component assembly used as the cage has a shape in which a pocket is formed between a pair of side wheels,
For example, it is easier to achieve a compact size as compared with a structure in which a retainer is provided in both the inner and outer halves, and the clutch component assembly can be arranged between the inner and outer rings of the ball bearing without difficulty.

When the side ring on one side of the cage in the clutch component assembly is engaged with the positioning groove on the inner diameter surface of the outer ring, the cage can be prevented from moving in the width direction with a simple structure. it can. If the width of the clutch piece in the axial direction is narrower than the height in the radial direction of the bearing, the overall width of the ball bearing with a built-in one-way clutch can be further narrowed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. This ball bearing with a built-in one-way clutch
Between the inner ring 1 and the outer ring 2 of the ball bearing, clutch component assemblies 4 and 4 are provided on both sides of the row of rolling elements 3, respectively. The clutch component assembly 4 includes a retainer 5, a clutch piece 6, and a spring member 7. As the ball bearing, a semi-standard type ball bearing, for example, a deep groove ball bearing with a seal often used (our model # 6005
For (φ25 × 47 × 12)), a ball bearing (# 63005 (φ25 × 47 × 14)) having a wide width can be used as it is. The rolling element 3 is held by a cage 8 for the rolling element, and rubber contact-type seals 9 and 9 mounted on the seal mounting groove 2b of the outer ring 2 are provided at both ends between the inner and outer rings 1 and 2. Is provided.

Retainer 5 in clutch component assembly 4
As shown in FIG. 2, a pillar portion 5c is integrally provided between a pair of side wheels 5a and 5b, and pockets 10 are formed at a plurality of circumferential positions. The outer diameter of the side ring 5a on one side is slightly larger than the inner diameter surface of the outer ring 2, and the positioning groove 11 formed on the inner diameter surface of the outer ring 2 has an outer diameter portion of the side wheel 5a on the larger diameter side. Fit. By this fitting, the cage 5 is fixed to the outer ring 2 in both the axial direction and the rotation direction. The column portion 5c of the retainer 5 is formed with a double wall of the wall portions 5ca and 5cb by forming a recess 5d on the outer diameter side for mounting the spring member 7.

The clutch piece 6 is of a sprag shape capable of contacting the outer diameter surface of the inner ring 1 and the inner diameter surface of the outer ring 2.
It is accommodated in each pocket 10 of the cage 5. Specifically, the shape of the clutch piece 6 is, for example, a plate shape having a constant thickness, in which both sides of the side surface are concave curves and upper and lower sides are convex curves, and each corner is rounded. . Further, the clutch piece 6 has a narrow width dimension B in the axial direction, which is the plate thickness, with respect to the height dimension H in the bearing radial direction, and is manufactured by pressing or the like.

The spring member 7 biases each of the clutch pieces 6 in a predetermined direction, and is a leaf spring in which a clutch contact piece 7b extends from the tip of one of the U-shaped engaging portions 7a. One wall portion 5c of the pillar portion 5c formed in the cage 5
It is attached with the engaging portion 7a fitted to a.

According to this structure, the sprag-like clutch piece 6 in each clutch component assembly 4, 4 is replaced by the spring member 7.
Since the inner ring 1 and the outer ring 2 are pushed by and come into contact with the inner ring 1 and the outer ring 2, relative rotation of the inner ring 1 and the outer ring 2 in one direction is prevented, and the inner ring 1 and the outer ring 2 are rotatable only in opposite directions. Further, a radial load or the like between the inner and outer races 1, 2 is supported via the rolling elements 3 of the ball bearing.

The function of the clutch will be described with reference to FIG.
As shown in (B), the clutch piece 6 is a portion 6 close to the inner ring 1.
It contacts the column portion 5c of the cage 5 at a, and is pressed by the spring member 7 from the side closer to the inner ring 1 than the portion 6a and the side opposite to the portion 6a. Therefore, the clutch piece 6 always receives the counterclockwise moment force (arrow a) in the pocket 10 in the figure. As a result, the clutch piece 6 is given a moment force in contact with the outer diameter surface of the inner ring 1 and the inner diameter surface of the outer ring 2. In this state, if the inner ring 1 rotates clockwise (arrow b) in the figure and the outer ring 2 is fixed,
All of the clutch pieces 6 can be engaged with the inner ring 1 and the outer ring 2 at the same time, and rotation is blocked.

As described above, in this ball bearing with a built-in one-way clutch, since the sprag-shaped clutch piece 6 is used in the one-way clutch portion, it is not necessary to form a cam surface on the inner ring 1 and the outer ring 2, and the inner and outer ring of the ball bearing can be formed. 1,2
Both side portions of the raceway grooves 1a, 2a can be used as contact portions of the clutch piece 6. Therefore, it is easy to make it compact,
Also, the outer ring dedicated to the clutch is not required, and the number of parts is reduced. Since the clutch component assembly 4 is provided on both sides of the row of rolling elements, the required stopping torque can be obtained even if each of them is narrow. Therefore, the width of the clutch piece 6 is narrower than the height H and the width of the clutch portion can be narrowed. Further, since the clutch component assembly 4 has a shape in which the pocket 10 is formed between the pair of side wheels 5a and 5b, is used as the cage 5, it is more compact than the conventional one in which the cage is provided in the inner and outer double layers. The ball bearing can be easily manufactured, and the clutch component assembly 4 can be arranged between the inner and outer races 1 and 2 of the ball bearing without difficulty. Therefore, as the inner and outer rings 1 and 2, the wide ball bearings of a normal ball bearing can be used as they are, and the dedicated ball bearing and the ball bearing with a built-in one-way clutch can be used as common parts. Retainer 5 for the assembly process
The clutch component assembly 4 having the clutch piece 6 and the spring member 7 attached thereto may be assembled between the inner and outer races 1 and 2, and the productivity is also good.

FIG. 3 shows another embodiment of the present invention. In this example, in the embodiment of FIG. 1, the seal 9 is eliminated, each clutch component assembly 4 is made wide, and the cage side wheel 5a is press-fitted into the seal mounting groove 2b of the outer ring 2. It is a thing. The positioning groove 11 of the outer ring 2 in the example of FIG. 1 is not provided. The other structure is the same as that of the embodiment shown in FIG. In the case of such a configuration, the width of the clutch piece 6 of the clutch component assembly 4 is widened, so that the torque capacity can be increased. Further, since it is not necessary to provide the positioning groove 11 of the clutch retainer 5, the outer ring 2 can be easily manufactured, and the outer ring 2 can be more commonly used as a normal ball bearing.

In each of the above embodiments, if the required torque capacity is small, the clutch component assembly 4 may be provided only on one side of the rolling element row. Also,
An application example of the ball bearing with a built-in one-way clutch of these embodiments is, for example, a reverse rotation preventing mechanism in a fully automatic washing machine. This reverse rotation preventing mechanism does not prevent the rotor blades from rotating in the forward and reverse directions during washing, and when the dehydration tub and the rotor blades rotate in the same direction at the same speed during dehydration,
It serves to prevent the reverse rotation of the dehydration tank, and the one-way clutch built-in ball bearing is interposed between the rotary blade shafts provided on the inner and outer double shafts and the rotation shaft of the dehydration tank. As a result, the washing machine can be made compact and the cost can be reduced.

[0019]

According to the ball bearing with a built-in one-way clutch of the present invention, a clutch part assembly is provided between the inner ring and the outer ring of the ball bearing on both sides of the rolling element row. A cage having a pocket formed by providing a pillar portion between a pair of side wheels, and a plurality of sprag-like clutches housed in the pockets of the cage and capable of contacting the outer diameter surface of the inner ring and the inner diameter surface of the outer ring. Since it is composed of one piece and a plurality of spring members that bias these clutch pieces in a predetermined direction, the inner and outer rings are shared by the one-way clutch and the ball bearing, the number of parts is reduced, and the width direction is compact. The inner and outer rings do not require complicated processing and are easy to manufacture.

[Brief description of drawings]

FIG. 1A is a cutaway side view of an embodiment of the present invention,
(B) is a partially cutaway front view thereof.

FIG. 2 is a partially exploded perspective view of a clutch component assembly.

FIG. 3 is a cutaway side view of another embodiment of the present invention.

FIG. 4 is a cutaway side view of a conventional example.

FIG. 5 is a cutaway front view of the one-way clutch.

FIG. 6 is a partial cross-sectional view of another example of a conventional one-way clutch.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Inner ring, 2 ... Outer ring, 3 ... Rolling element, 4 ... Clutch component assembly, 5 ... Retainer, 5a, 5b ... Side wheel, 5c ... Column part, 6
... Clutch pieces, 7 ... Spring members, 10 ... Pockets, 11 ...
Positioning groove

Claims (3)

[Claims] 1. A clutch component assembly is provided between an inner ring and an outer ring of a ball bearing, on both sides of a row of rolling elements. The clutch component assembly includes a column portion between a pair of side rings. Retainer having pockets formed at a plurality of circumferential positions, sprag-like clutch pieces housed in each pocket of the retainer and capable of contacting the outer diameter surface of the inner ring and the inner diameter surface of the outer ring, and these clutch pieces, respectively. Ball bearing with a built-in one-way clutch consisting of a plurality of spring members for urging the spring in a predetermined direction. 2. The outer diameter of the side ring on one side of the cage of the clutch component assembly is formed to be larger than the inner diameter surface of the outer ring, and the outer diameter portion of the large diameter side ring is formed on the inner diameter surface of the outer ring. The ball bearing with a built-in one-way clutch according to claim 1, wherein a positioning groove into which is fitted is provided. 3. The ball bearing with a built-in one-way clutch according to claim 1, wherein the clutch piece has a width dimension in the axial direction narrower than a height dimension in the bearing radial direction.