JP4129633B2 - Rolling bearing integrated one-way clutch - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rolling bearing integrated one-way clutch formed by integrally forming a rolling bearing and a sprag type one-way clutch.
[0002]
[Prior art]
Rolling bearing integrated one-way clutches generally have a structure in which sprag type one-way clutches are arranged on both sides or one side of rolling bearings including ball bearings. The structure is such that the inner and outer rings of the one-way clutch are integrally formed.
[0003]
In such a one-way clutch integrated with a rolling bearing, various measures are mainly taken on the cage in order to facilitate assembly and reduce the size.
[0004]
An example of a conventional rolling bearing integrated one-way clutch in which one-way clutches are arranged on both sides of a ball bearing is shown in FIG. 6 as an axial parallel cross-sectional view, and FIG. 7 as an exploded perspective view of the cage and the spring / side plate.
[0005]
In this example, the inner ring 61 and the outer ring 62 are formed with ball bearing race surfaces 61a and 62a at the center portions in the axial direction, and raceway surfaces 61b and 61c for one-way clutches and 62b and 62c on both sides thereof. And a plurality of balls 63 as rolling elements are movably disposed on the raceway surface for the ball bearing, and a plurality of sprags 64 are disposed on the raceway surfaces for the one-way clutch on both sides thereof. . The balls 63 and the sprags 64 are held at predetermined intervals in the circumferential direction by a common cage 65 in which two annular bodies 651 and 652 are engaged and integrated in the axial direction. Further, on each outer side of the sprags 64 on both sides, a spring / side plate 66 in which a plurality of spring pieces 66a for urging each sprag 64 in the locking direction is formed to each annular body 651, 652 constituting the retainer 65. It is fixed.
[0006]
The two annular bodies 651 and 652 constituting the retainer 65 are respectively provided with recesses 651a and 652a constituting a pocket for accommodating the ball 63 in the center in the engaged state with each other on one axial end side in the circumferential direction. The pockets 651b and 652b for accommodating sprags are formed on the opposite side while being formed at regular intervals. Of the two annular bodies 651 and 652, one annular body 651 is formed with claw portions 651c extending in the axial direction at a plurality of circumferential locations, and the other annular body 652 has each claw portion 651c. A plurality of recesses 652c are formed to engage with each other.
[0007]
When assembling the rolling bearing integrated one-way clutch having the above-described configuration, a required number of balls 63 are inserted and arranged between the inner ring 61 and the outer ring 62 at a substantially constant interval in the circumferential direction, and then the balls 63 are inserted from both sides in the axial direction. The annular members 651 and 652 are inserted between the inner ring 61 and the outer ring 62 so as to sandwich them, and the claw portions 651c are inserted into the respective recesses 652c to be engaged with each other. Each of the claw portion 651c and the recessed portion 652c is provided with an undercut. That is, as shown in FIG. 8 which is an enlarged-axis parallel sectional view in the engaged state, the claw portion 651c has an inclined surface 651d formed on the distal end side thereof, and a return portion 651e formed on the proximal end side thereof. Is formed with a return portion 652d that meshes with the return portion 651e. Such return portions 651e and 652d facilitate the engagement of the annular bodies 651 and 652 by snap fitting during assembly, and the assembled state can be easily achieved by the engagement of the return portions 651e and 652e after assembly. Consideration is made so as not to be solved (see, for example, Patent Document 1).
[0008]
Also, a structure in which a sprag type one-way clutch is arranged on one side of a rolling bearing is also known in which a rolling bearing retainer and a sprag retainer are integrated in the axial direction via an engagement mechanism. (See, for example, Patent Document 2).
[0009]
[Patent Document 1]
Japanese Unexamined Patent Publication No. 2000-304068 (2nd to 4th pages, FIG. 2, FIG. 3, FIG. 7)
[Patent Document 2]
Japanese Patent Application Laid-Open No. 11-72127 (refer to pages 3 to 4 and FIGS. 4 to 9).
[0010]
[Problems to be solved by the invention]
By the way, this kind of rolling bearing integrated one-way clutch is lubricated with grease, and therefore grease is sealed between the inner ring and the outer ring. In the rolling bearing integrated one-way clutch disclosed in Patent Document 1, the spring / side plates 66 disposed at both ends in the axial direction have a function of preventing leakage of grease.
[0011]
That is, since the two annular bodies 651 and 652 constituting the retainer 65 each have a claw portion 651c or a recess 652c having an undercut, a hole for removing the mold is necessary. In each of the annular bodies 651 and 652, 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 the recess 652c and the sprag pocket 652b are shown. Need to be formed at a position where they communicate with each other. The spring / side plate 66 prevents grease from leaking from these holes.
[0012]
These punching holes are used as passage holes when grease is sealed between the inner ring 61 and the outer ring 62. That is, after mounting one spring and side plate 66 and before mounting the other spring and side plate 66, after sealing grease through the axial through hole on the side where the spring and side plate 66 is not mounted, By mounting the spring / side plate 66 on the other side, the assembly workability including the grease filling work 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 the rolling bearing is more advantageous than a structure in which a one-way clutch is arranged on both sides of the rolling bearing. In addition, when applying a technique for engaging two annular bodies in the axial direction with an engagement mechanism including an undercut as in Patent Document 1 described above, a one-way clutch is arranged on the spring and side plate. Therefore, the grease on the other side needs to be sealed by providing a separate side plate or the like.
[0014]
An object of the present invention is 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, and does not require a side plate for preventing grease leakage on the side where the one-way clutch is not arranged. In addition, the assembly workability including sealing of grease is excellent, and further, for the purpose of providing a rolling bearing integrated one-way clutch capable of distributing the sealed crease to the raceway surface of the inner ring and the outer ring. Yes.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, the rolling bearing integrated one-way clutch of the present invention has a plurality of annular spaces between an inner ring and an outer ring in which a one-way clutch raceway surface is formed on one axial side of the rolling bearing raceway surface. The rolling elements and the sprags are arranged so as to contact the corresponding raceway surface, and the rolling elements and the sprags are in a plurality of pockets provided in a common retainer formed by integrating two annular bodies in the axial direction. A rolling bearing integrated one-way clutch provided with a biasing means for biasing the sprags in the locking direction within the pockets. An annular flat plate portion that seals one axial end portion of the annular space between the inner ring and the outer ring is integrally formed on one of the two annular bodies that are configured, and the one annular body includes: Axial Is engaging portion comprising a guide groove extending in the formation, it communicates with the guide groove, together with the radial through hole that penetrates is formed in the radial direction, the other annular body, the engagement A claw portion that is inserted into and engaged with the portion is formed, and an 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 is integrally formed on an annular flat plate member, and this urging means is the other annular body. A configuration in which the other axial end of the annular space is sealed by covering the axial through hole and sealing the other axial end of the annular space can be suitably employed.
[0017]
Further, in the present invention, each annular body constituting the cage is made of injection molding resin, and the axial through hole and the radial through hole formed in the annular body are engaged with each other. The structure (Claim 3) used as the punching hole of the metal mold | die for formation of the undercut provided in a part can be employ | adopted suitably.
[0018]
According to the present invention, a rolling bearing integrated one-way clutch having a structure in which a one-way clutch is arranged only on one side of a rolling bearing has good assembly workability based on the technique of Patent Document 1 described above, and grease is provided on one side. A function of making the side plate for sealing unnecessary and further improving the fluidity of the grease between the inner and outer rings is added.
That is, in the configuration of the invention according to claim 1, one of the two annular bodies constituting the cage 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 annular body side, and the other annular body can be filled with grease after assembly by forming an axial through hole penetrating in the axial direction. It becomes. The annular body with the annular flat plate formed integrally forms a radial through hole that penetrates in the radial direction to facilitate the flow of grease sealed between the inner and outer rings in the radial direction. can do.
[0019]
Further, as in the invention according to claim 2, 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 on the annular body side where an axial through hole is formed. If the through-holes are sealed in this way, the side plate for grease sealing and the urging means can be used together, and the effect of reducing the number of parts can be achieved.
[0020]
And when the two annular bodies which comprise a holder | retainer are made into injection molding resin like the invention which concerns on Claim 3, in order to form the undercut of an engaging mechanism, an axial direction through-hole and a radial direction through-hole respectively It is possible to use a hole in the mold.
[0021]
DETAILED DESCRIPTION OF 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 with a part of a side plate cut away. FIG. 3 is a cross-sectional view taken along the line AA in FIG.
[0022]
A deep groove ball bearing raceway surface 1 a and a one-way clutch raceway surface 1 b are formed adjacent to each other in the axial direction on the outer circumferential surface of the inner ring 1. A deep groove ball bearing raceway surface 2a and a one-way clutch raceway surface 2b are formed on the inner peripheral surface of the outer ring 2 so as to face each of the raceway surfaces. A plurality of balls 3 as rolling elements are disposed between the inner ring 1 and the outer ring 2 so as to be in rolling contact with both of the deep groove ball bearing raceways 1a and 2a, and a one-way clutch raceway. A plurality of sprags 4 are arranged so as to be tiltably in contact with the surfaces 1b and 2b, respectively.
[0023]
A cage 5 is provided between the inner ring 1 and the outer ring 2 to hold the balls 3 and sprags 4 at a predetermined pitch in the circumferential direction. The cage 5 is formed by integrating the first and second annular bodies 51 and 52 with each other in the axial direction, and the annular bodies 51 and 52 are provided with the same number of recesses at positions facing each other. Locations 51a and 52a are formed, and a ball pocket is formed by these recesses 51a and 52a in the engaged state. An annular flat plate portion 51b is formed on the back surface side of the formation surface of the recess 51a of the first annular body 51. The flat plate portion 51b has an inner periphery and an outer periphery thereof, respectively, and an outer peripheral surface of the inner ring 1 and It faces the inner peripheral surface of the outer ring 2 with a slight gap, and this flat plate portion 51 b seals one end side in the axial direction of the annular space between the inner ring 1 and the outer ring 2. Further, a plurality of sprag pockets 52b for accommodating the sprags 4 are formed on the side opposite to the formation side of the recess 52a of the second annular body 52.
[0024]
The sprags 4 are urged toward the annular flat plate member 6a in the locking direction at the other axial end of the annular space between the inner ring 1 and the outer ring 2, that is, at the end where the plug 4 is disposed. A spring / side plate 6 in which a plurality of spring pieces 6 b are integrally formed is fixed to the second annular body 52.
[0025]
4A and 4B are explanatory views of the first annular body 51 constituting the cage 5, in which FIG. 4A is a perspective view and FIG. Moreover, FIG. 5 is explanatory drawing of the 2nd annular body 52 similarly, (A) is a perspective view, (B) is the B arrow enlarged view.
[0026]
The first annular body 51 is formed with an engaging portion 51c protruding in the axial direction between the recesses 51a for the ball pocket, and each engaging portion 51c has a guide extending in the axial direction. A groove 51d is formed, and a radial through hole 51e penetrating in the radial direction of the annular body 1 is formed on the back 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, the second annular body 52 is formed with a claw portion 52c protruding in the axial direction between the recesses 52a for the ball pocket. The claw portion 52c has an inclined surface 52d at the tip, and a return portion 52e on the proximal end side of the inclined surface 52d. In addition, an axial through hole 52f penetrating in the axial direction is formed at the base portion of each claw portion 52c.
[0028]
In order to integrate the two annular bodies 51 and 52 described above, the respective claw portions 52c are respectively guided in such a state that the guide grooves 51d and the claw portions 52c face each other and their centers are substantially coincided with each other. By inserting into the groove 51d, the return portion 52e of the claw portion 52c eventually reaches the radial through hole 51e communicating with the back side of the guide groove 51d, so that it is separated in a normal use state by snap fit. Engagement and integration can be reliably performed impossible.
[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 back side of the guide groove 51d, and the second annular body 52 has a return portion formed at the proximal end portion of the claw portion 51c. Each of the radial through holes 51e can be formed as a punch hole of the split mold by using a split mold that moves in the radial direction, and the return portion 52e. Can be formed using the axial through hole 52f as a die hole.
[0030]
In order to assemble the above-described embodiment of the present invention, the required number of balls 3 are approximately equal in the radial direction between the raceway surfaces 1a and 2a for the rolling bearing in a state where the outer ring 2 is arranged outside the inner ring 1. 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 portion 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 portion 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. The 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 raceways 1a and 2a by injecting grease through the axial through holes 52f. Thereafter, the sprags 4 are inserted into the 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, and grease leakage is prevented. It does not occur.
[0031]
In use, the presence of the radial through-hole 51e formed in the first annular body 51 allows the grease to freely flow between the inner ring 1 and the outer ring 2, and the lifetime associated with improved lubrication performance. We can expect improvement.
In the above embodiment, an example in which a ball bearing is used as the rolling bearing has been described. However, other rolling bearings such as a roller bearing can also be used.
[0032]
【The invention's effect】
As described above, according to the present invention, in the rolling bearing integrated one-way clutch in which the one-way clutch is arranged on one side of the rolling bearing, the two annular bodies are engaged with the cage that holds the rolling elements and the sprags. A flat plate portion is provided on one of them to seal the annular space between the inner and outer rings, and a radial through hole is formed to penetrate in the radial direction, and the other annular body is penetrated in the axial direction. Since the holes are formed, the workability of the assembly including the 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]
In addition, the axial through hole and the radial through hole can be used for die-cutting for forming an undercut provided in the engaging portion of each annular body, and it is difficult to separate even by an action such as an impact load. Can be a container.
[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 an embodiment of the present invention shown by cutting out a part of a side plate.
3 is a cross-sectional view taken along the line AA in FIG.
FIGS. 4A and 4B are explanatory views of a first annular body 51 constituting the cage 5 in the embodiment of the present invention, FIG. 4A is a perspective view, and FIG.
FIGS. 5A and 5B are explanatory views of a second annular body 52 that constitutes the cage 5 in the embodiment of the present invention, FIG. 5A is a perspective view, and FIG. .
FIG. 6 is an axial parallel sectional view showing an example of a conventional rolling bearing integrated one-way clutch in which one-way clutches are arranged on both sides of a ball bearing.
7 is an exploded perspective view of a cage 65 and a spring / side plate 66 in the conventional example of FIG.
8 is a cross-sectional view of a main part in an engaged state of two annular bodies 651 and 652 constituting the retainer 65 in the conventional example of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Inner ring 2 Outer ring 3 Ball 4 Sprag 5 Cage 51 1st annular body 51b Annular flat plate part 51c Engagement part 51d Recessed part 51e Radial through hole 52 Second annular body 52c Claw part 52e Return part 52f Axial through hole 6 Spring and side plate 6a Annular flat plate member 6b Spring piece

Claims (3)

A plurality of rolling elements and sprags are arranged in an annular space between an inner ring and an outer ring where a one-way clutch raceway surface is formed on one axial side of a rolling bearing raceway surface so as to contact the corresponding raceway surface. And the sprags are housed in a plurality of pockets provided in a common cage formed by integrating two annular bodies in the axial direction and are held at predetermined intervals in the circumferential direction. In the rolling bearing integrated one-way clutch provided with a biasing means for biasing the sprag in the lock direction in the pocket,
An annular flat plate portion for sealing one axial end portion of the annular space between the inner ring and the outer ring is integrally formed on one of the two annular bodies constituting the cage, and the one annular member is formed. The body is formed with an engaging portion having a guide groove extending in the axial direction, and is formed with a radial through hole communicating with the guide groove and penetrating in the radial direction. The rolling bearing integrated one-way clutch is characterized in that a claw portion inserted into and engaged with the engaging portion is formed and an axial through hole penetrating in the axial direction is formed. The urging means has a structure in which a plurality of spring pieces for urging each sprag is integrally formed on an annular flat plate member, and this urging means is mounted on the outer side in the axial direction of the other annular body. 2. The rolling bearing integrated one-way clutch according to claim 1, wherein the one-way clutch integrated with a rolling bearing is configured to cover the axial through hole and close the other axial end of the annular space. Each annular body constituting the cage is made of injection-molded resin, and the axial through-hole and the radial through-hole formed in the annular body are undercuts provided at the engaging portions between the annular bodies. The rolling bearing integrated one-way clutch according to claim 1, wherein the one-way clutch is a die hole for forming.

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