JP2004324738A - One-way clutch structured in a single piece with rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a one-way clutch structured in a single piece with a rolling bearing in which the one-way clutch is installed on one side of the rolling bearing, assuring good easiness in executing the assembling works including grease encapsulation, good flowing performance of the encapsulated grease between the inner ring and the outer ring, and also a long lifetime. <P>SOLUTION: The one-way clutch structured in a single piece with the rolling bearing is configured so that a flat plate part 51b in a ring shape for sealing a ring-shaped space between the inner ring 1 and the outer ring 2 is formed rigidly on one of the two rings 51 and 52 constituting a retainer 5, where a radially stretching through hole 51e is formed penetrating in the radial direction, and in the other ring, an axially stretching through hole 52f is formed penetrating in the axial direction, and thereby the grease can be injected through the hole 52f at the time of assembling, and during the service, the grease can flow in the radial direction between the inner 1 and outer rings 2 through the hole 51e, which allows achievement of an enhanced lubricating performance. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rolling bearing integrated one-way clutch formed integrally with a rolling bearing and a sprag type one-way clutch.
[0002]
[Prior art]
In general, a one-way clutch integrated with a rolling bearing has a structure in which a sprag-type one-way clutch is arranged on both axial sides or one side of a rolling bearing such as a ball bearing. The inner and outer races of the one-way clutch are integrally formed.
[0003]
In such a rolling bearing integrated one-way clutch, various measures are mainly taken for the retainer in order to facilitate the assembly and make the device compact.
[0004]
An example of a conventional one-way clutch with a rolling bearing in which a one-way clutch is arranged on both sides of a ball bearing is shown in FIG. 6 in an axially parallel sectional view, and in FIG. 7 in an exploded perspective view of its retainer and a spring / side plate.
[0005]
In this example, the inner ring 61 and the outer ring 62 are formed with raceway surfaces 61a, 62a for ball bearings at their respective axially central portions, and on both sides thereof, raceway surfaces 61b and 61c, and 62b and 62c for one-way clutches. Are formed, a plurality of balls 63 as rolling elements are rotatably arranged on the raceway surface for the ball bearing, and a plurality of sprags 64 are arranged on the raceway surfaces for the one-way clutch on both sides thereof. . The ball 63 and the sprag 64 are held at predetermined intervals in the circumferential direction by a common retainer 65 in which the two annular bodies 651 and 652 are axially engaged and integrated. A spring / side plate 66 formed with a plurality of spring pieces 66a for urging the sprags 64 in the locking direction is provided on each outer side of the sprags 64 on both sides with respect to each of the annular bodies 651 and 652 constituting the retainer 65. It is fixed.
[0006]
The two annular bodies 651 and 652 constituting the retainer 65 are provided with recesses 651a and 652a, which form pockets for accommodating the ball 63 at the central portion in a mutually engaged state, in the circumferential direction at one end in the axial direction. At regular intervals, pockets 651b and 652b for receiving sprags are formed on the opposite side. A claw portion 651c extending in the axial direction is formed at a plurality of circumferential positions on one of the two annular members 651 and 652, and each claw portion 651c is formed on the other annular member 652. Are formed and a plurality of recesses 652c to be engaged with.
[0007]
In assembling the rolling bearing integrated type one-way clutch having the above configuration, a required number of balls 63 are inserted and arranged at substantially constant intervals in the circumferential direction between the inner ring 61 and the outer ring 62, and then the balls 63 are inserted from both sides in the axial direction. Are inserted between the inner race 61 and the outer race 62 so as to interpose them, and the claws 651c are inserted into and engaged with the respective recesses 652c to integrate them with each other. An undercut is provided on each of the claw portion 651c and the concave portion 652c. That is, as shown in the enlarged sectional view parallel to the axis in the engaged state in FIG. 8, the claw portion 651c is formed with a slope 651d on the distal end side and a return portion 651e on the base end side. Is formed with a return portion 652d that meshes with the return portion 651e. With such return portions 651e and 652d, it is easy to engage the annular bodies 651 and 652 by snap fitting at the time of assembling, and after the assembly, the engagement state is easily achieved by engagement of the return portions 651e and 652e. Consideration is given so as not to be solved (for example, see Patent Document 1).
[0008]
Also, in a structure in which a sprag-type one-way clutch is arranged on one side of a rolling bearing, there is also known a structure in which a cage for a rolling bearing and a cage for a sprag are axially integrated via an engagement mechanism. (For example, see Patent Document 2).
[0009]
[Patent Document 1]
JP-A-2000-304068 (pages 2 to 4, FIGS. 2, 3 and 7)
[Patent Document 2]
Japanese Patent Application Laid-Open No. 11-72127 (see pages 3 to 4, FIG. 4 to FIG. 9).
[0010]
[Problems to be solved by the invention]
By the way, lubrication of this type of one-way clutch with a rolling bearing is performed by grease, so that grease is sealed between the inner ring and the outer ring. In the rolling bearing-integrated one-way clutch disclosed in Patent Literature 1, the spring / side plate 66 disposed at both ends in the axial direction has a function of preventing leakage of grease.
[0011]
That is, since the two annular bodies 651 and 652 constituting the retainer 65 each have the claw portion 651c or the concave portion 652c having an undercut, a hole for removing a mold is necessary. Each of the annular bodies 651 and 652 has a through hole in the axial direction indicated by H in the first annular body 651 in FIG. 7 (the second annular body 652 does not appear in the drawing, and a concave portion 652c and a sprag pocket 652b). Is formed at a position where the communication is established). The spring / side plate 66 prevents grease from leaking from these holes.
[0012]
In addition, these die-cutting holes are used as passage holes when filling grease between the inner ring 61 and the outer ring 62. That is, after mounting one spring / side plate 66, before mounting the other spring / side plate 66, after filling the grease through the axial through hole on the side where the spring / side plate 66 is not mounted, By mounting the spring / side plate 66 on the other side, the workability of the assembly including the work of sealing the grease is improved.
[0013]
By the way, in order to reduce costs, a structure in which a one-way clutch is arranged on one side of a rolling bearing is more advantageous than a structure in which a one-way clutch is arranged on both sides of a rolling bearing. In the case of applying a technique of axially engaging two annular bodies with an engagement mechanism including an undercut as in Patent Document 1 described above, a one-way clutch is provided as a spring / side plate. Since the grease is mounted on only one side, the grease on the other side needs to be sealed by separately providing a dedicated side plate or the like.
[0014]
An object of the present invention is to provide a rolling bearing integrated one-way clutch having a structure in which a one-way clutch is provided on one side of a rolling bearing, without requiring a side plate or the like for preventing grease leakage on a side where no one-way clutch is provided, Moreover, the object of the present invention is to provide a one-way clutch with an integrated rolling bearing, which has good workability in assembling including the filling of grease, and can spread the sealed creases well on the raceway surfaces of the inner ring and the outer ring. I have.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, a rolling bearing integrated type one-way clutch of the present invention is provided with a plurality of rolling bearing raceway surfaces in an annular space between an inner ring and an outer ring in which a one-way clutch raceway surface is formed on one axial side of the raceway surface. The rolling elements and the sprags are arranged so as to be in contact with the corresponding raceway surfaces, and the rolling elements and the sprags are provided in a plurality of pockets provided in a common retainer formed by axially engaging the two annular bodies. A rolling bearing-integrated one-way clutch, wherein the one-way clutch is provided with urging means for urging the sprags in the locking direction in the pockets, while being held at predetermined intervals in the circumferential direction. An annular flat plate portion sealing one axial end of an annular space between the inner ring and the outer ring is integrally formed on one of the two annular bodies constituting , Diameter With radial through hole that penetrates is formed in the direction, on the other annular body, characterized by the axial through hole penetrating in the axial direction is formed (claim 1).
[0016]
Here, in the present invention, the urging means has a structure in which a plurality of spring pieces for urging each sprag are integrally formed on an annular flat plate member, and the urging means is formed of the other annular body. A configuration (claim 2), which is mounted on the outside in the axial direction to cover the axial through hole and seal the other end of the annular space in the axial direction, can be suitably adopted.
[0017]
Further, in the present invention, each of the annular bodies constituting the retainer is made of an injection-molded resin, and the axial through-holes and the radial through-holes formed therein are engaged with each other. It is possible to suitably employ a configuration (claim 3) in which a die is formed as a hole for forming an undercut provided in the portion.
[0018]
The present invention provides a one-way clutch integrated with a rolling bearing having a structure in which a one-way clutch is provided only on one side of a rolling bearing, and has good workability in assembling based on the technique of Patent Document 1 described above, and furthermore, grease is provided on one side. This eliminates the need for a side plate for sealing, and further adds a function of improving the fluidity of grease between the inner and outer rings.
That is, in the configuration of the invention according to claim 1, one of the two annular bodies forming the retainer integrally forms an annular flat plate portion that seals one end side of the annular space between the inner and outer rings. This eliminates the need for a grease sealing side plate on the side of the annular body, and forms an axial through hole that penetrates the other annular body in the axial direction, so that grease can be sealed after assembly. It becomes. By forming a radial through hole in the annular body in which the annular flat plate is integrally formed, the grease sealed between the inner and outer rings can easily flow in the radial direction. can do.
[0019]
Further, as in the invention according to the second aspect, as the sprag urging means, an annular flat plate member in which a plurality of spring pieces are integrally formed is used, and this is used as the sprag biasing means. If the through holes are sealed by disposing the grease sealing side plate, the grease sealing side plate can also be used as the urging means, thereby achieving an effect of reducing the number of components.
[0020]
When the two annular bodies forming the retainer are made of injection-molded resin as in the invention according to claim 3, the axial through-hole and the radial through-hole are formed to form the undercut of the engagement mechanism. Can be used.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view of an embodiment of the present invention, and FIG. 2 is a side view in which a part of a side plate is cut away. FIG. 3 is a sectional view taken along line AA of FIG.
[0022]
On the outer peripheral surface of the inner ring 1, a raceway surface 1a for a deep groove ball bearing and a raceway surface 1b for a one-way clutch are formed adjacent to each other in the axial direction. A raceway surface 2a for a deep groove ball bearing and a raceway surface 2b for a one-way clutch are formed on the inner peripheral surface of the outer race 2 so as to face the raceways. A plurality of balls 3 as rolling elements are arranged between the inner ring 1 and the outer ring 2 so as to be in rolling contact with both the raceway surfaces 1a and 2a for the deep groove ball bearing. A plurality of sprags 4 are arranged so as to be tiltably in contact with the surfaces 1b and 2b, respectively.
[0023]
Between the inner ring 1 and the outer ring 2, a retainer 5 for holding the ball 3 and the sprag 4 at a predetermined pitch in the circumferential direction is provided. The retainer 5 is formed by integrally engaging first and second annular bodies 51 and 52 with each other in the axial direction. The annular bodies 51 and 52 have the same number of recesses at opposite positions. Locations 51a and 52a are formed, and in the engaged state, these recesses 51a and 52a form a ball pocket. An annular flat plate portion 51b is formed on the back surface side of the surface of the first annular body 51 where the concave portion 51a is formed, and the inner and outer circumferences of the flat plate portion 51b are respectively the outer circumferential surface of the inner ring 1 and the outer circumferential surface. The inner peripheral surface of the outer ring 2 is opposed to the inner peripheral surface with a slight gap, and one end in the axial direction of the annular space between the inner ring 1 and the outer ring 2 is sealed by the flat plate portion 51b. A plurality of sprag pockets 52b for accommodating the respective sprags 4 are formed on a side of the second annular body 52 opposite to the side on which the recess 52a is formed.
[0024]
Then, at the other axial end of the annular space between the inner ring 1 and the outer ring 2, that is, at the end on the side where the plug 4 is disposed, each sprag 4 is urged toward the annular flat plate member 6 a in the locking direction. A spring / side plate 6 integrally formed with a plurality of spring pieces 6b is fixed to the second annular body 52.
[0025]
FIGS. 4A and 4B are explanatory views of the first annular body 51 constituting the retainer 5, wherein FIG. 4A is a perspective view, and FIG. 5A and 5B are explanatory views of the second annular body 52, wherein FIG. 5A is a perspective view, and FIG.
[0026]
The first annular body 51 is formed with engagement portions 51c that protrude in the axial direction between the recesses 51a for ball pockets, and each of the engagement portions 51c has a guide extending in the axial direction. A groove 51d is formed, and a radial through hole 51e that penetrates in a radial direction of the annular body 1 is formed on the inner side of the guide groove 51d (the base end side of the engaging portion 51c). The inner side of the groove 51d communicates with the radial through hole 51e.
[0027]
On the other hand, in the second annular body 52, a claw portion 52c that protrudes in the axial direction is formed between the recesses 52a for the ball pockets. The claw portion 52c has a slope 52d formed at the tip and a return portion 52e formed at the base end side of the slope 52d. An axial through hole 52f penetrating in the axial direction is formed at the base of each claw 52c.
[0028]
In order to integrate the two annular bodies 51 and 52, the respective claw portions 52c are respectively guided so that the guide grooves 51d and the claw portions 52c face each other and the centers of the respective guide members are substantially aligned. By being inserted into the groove 51d, the return portion 52e of the claw portion 52c eventually reaches the radial through hole 51e communicating with the inner side of the guide groove 51d, and is separated in a normal use state by snap fitting. It is possible to reliably engage and integrate them.
[0029]
The first and second annular bodies 51 and 52 described above are manufactured by injection molding a resin. The first annular body 51 has a radial through hole 51e communicating with the guide groove 51d on the inner side, and the second annular body 52 has a return portion formed at the base end of the claw 51c. 52e are undercuts, however, by using a split die that moves in the radial direction, the through hole 51e itself can be formed as a punched hole of the split die, and the return portion 52e is formed. Can be formed by using the axial through hole 52f as a die hole.
[0030]
In order to assemble the above-described embodiment of the present invention, in a state where the outer ring 2 is arranged outside the inner ring 1, the required number of balls 3 are substantially uniformly distributed in the radial direction between the raceway surfaces 1a and 2a for the rolling bearing. , The first and second annular bodies 51 and 52 are inserted between the inner ring 1 and the outer ring 2 so as to sandwich the ball 3 from both sides in the axial direction, and each claw 52c is inserted into each guide groove 52d. To engage and integrate. In this state, the annular space between the inner ring 1 and the outer ring 2 is in a state where the end on the first annular body 51 side is sealed by the flat plate portion 51b of the first annular body 51, and on the opposite side. An axial through hole 52f formed in the second annular body 52 is open. In this state, grease can be easily filled between the rolling bearing raceway surfaces 1a and 2a by injecting grease through the respective axial through holes 52f. Thereafter, the sprags 4 are inserted into the respective sprag pockets 52b formed in the second annular body 52, and the spring / side plate 6 is mounted. In this state, the spring / side plate 6 covers the axial through hole 52f, and the end of the annular space between the inner ring 1 and the outer ring 2 on the second annular body 52 side is also sealed, so that grease leakage is prevented. Will not occur.
[0031]
In use, the grease can freely flow between the inner ring 1 and the outer ring 2 due to the presence of the radial through-holes 51e formed in the first annular body 51, and the service life associated with the improvement in lubrication performance. We can expect improvement.
In the above embodiment, an example in which a ball bearing is used as a rolling bearing has been described. However, other rolling bearings such as a roller bearing may be used.
[0032]
【The invention's effect】
As described above, according to the present invention, in a rolling bearing integrated type one-way clutch in which a one-way clutch is arranged on one side of a rolling bearing, two retainers holding a rolling element and a sprag are engaged with two annular bodies. And a flat plate portion that seals the annular space between the inner and outer rings, and a radial through hole that penetrates in the radial direction is formed on one of the annular members. Since the holes are formed, the workability of assembling including sealing of the grease is good, and the fluidity of the grease is good even during use, the lubricating performance is improved, and the life is also improved.
[0033]
Further, the axial through-holes and the radial through-holes can be used for die-cutting for forming an undercut provided in the engaging portion of each annular body, and are hardly separated even by an action such as an impact load. Vessel.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of an embodiment of the present invention.
FIG. 2 is a side view of the embodiment of the present invention in which a part of a side plate is cut away.
FIG. 3 is a sectional view taken along line AA of FIG. 1;
FIGS. 4A and 4B are explanatory views of a first annular body 51 constituting the retainer 5 according to the embodiment of the present invention, wherein FIG. 4A is a perspective view and FIG.
FIG. 5 is an explanatory view of a second annular body 52 constituting the retainer 5 according to the embodiment of the present invention. FIG. 5A is a perspective view, and FIG. 5B is an enlarged view of FIG. .
FIG. 6 is an axially parallel sectional view showing an example of a conventional one-way clutch with a rolling bearing in which a one-way clutch is arranged on both sides of a ball bearing.
7 is an exploded perspective view of the retainer 65 and the spring / side plate 66 in the conventional example of FIG.
8 is a cross-sectional view of a main part in an engagement state of two annular bodies 651 and 652 constituting the retainer 65 in the conventional example of FIG.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 inner ring 2 outer ring 3 ball 4 sprag 5 retainer 51 first annular body 51b annular flat plate portion 51c engaging portion 51d concave portion 51e radial through hole 52 second annular body 52c claw portion 52e return portion 52f axial through hole 6 spring / side plate 6a annular flat plate member 6b spring piece

Claims (3)

A plurality of rolling elements and sprags are disposed in an annular space between an inner ring and an outer ring in which a one-way clutch raceway surface is formed on one axial side of a rolling bearing raceway surface so as to be in contact with the corresponding raceway surface. The sprags are accommodated in a plurality of pockets provided in a common retainer formed by axially engaging the two annular bodies and integrally held, and are respectively held at predetermined circumferential intervals. In a rolling bearing integrated one-way clutch provided with a biasing means for biasing the sprag in the locking direction in the pocket,
An annular flat plate portion sealing one axial end of an annular space between the inner ring and the outer ring is integrally formed on one of the two annular members constituting the retainer, and the one annular member is formed. The body has a radial through hole penetrating in the radial direction, and the other annular body has an axial through hole penetrating in the axial direction. One-way clutch. The urging means has a structure in which a plurality of spring pieces for urging each sprag are integrally formed on an annular flat plate member, and the urging means is mounted on an axially outer side of the other annular body. The rolling bearing integrated one-way clutch according to claim 1, wherein the one-way clutch integrated with the rolling bearing is configured to cover the axial through hole and close the other end in the axial direction of the annular space. Each of the annular bodies constituting the retainer is made of an injection-molded resin, and the axial through-holes and the radial through-holes formed therein are provided with an undercut provided at an engagement portion between the annular bodies. The rolling bearing integrated type one-way clutch according to claim 1 or 2, wherein the one-way clutch is a hole for forming a mold.

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