Koyo Seiko Company, Ltd.

Jtekt Corporation

Kazuo Iga

Tetsuo Ikeda

Kazushi Mizutani

Kiyoshi Tanimoto

Takanobu Takamatsu

Kenji Sakamoto

Satoshi Fujiwara

Jin Ito

Kazuaki Yamada

Tsutomu Shiraishi

Tsuneichi Hattori

In a one-way clutch integrated with a rolling bearing, rolling elements and sprags are arranged in an annular space between an inner race and an outer race in each of which a one-way clutch raceway surface is formed in one axial side of a rolling bearing raceway surface. The rolling elements and the sprags make contact with respective raceway surfaces and are respectively housed in circumferentially spaced pockets formed in a common cage configured by mutually engaging and integrating two annular members in an axial direction. The one-way clutch includes urging means for urging the sprags in a locking direction in the pockets. An annular flat plate portion which seals one axial end portion of the annular space between the inner race and the outer race is integrally formed in one of the two annular members constituting the cage. Respective at least one radial and axial through holes are formed in the annular member.

One-way clutch integrated with a rolling bearing, and method of producing the same

A one-way clutch integrated with a rolling bearing includes rolling elements and sprags which are arranged in an annular space between an inner race and an outer race. In each of the inner and outer races, a one-way clutch raceway surface is formed in one axial side of a rolling bearing raceway surface. The rolling elements and the sprags make contact with respective raceway surfaces and are respectively housed in circumferentially spaced pockets formed in a common cage configured by mutually engaging and integrating two annular members in an axial direction. An associated peripheral side of each of the sprags contacts a surface of either a shaft fitted to an inner peripheral face of the inner race or a housing to which an outer peripheral face of the outer race is fitted.

One-way clutch integrated with a rolling bearing

A one-way clutch includes an outer race, wherein a plurality of windows are formed in one plate-like member, is placed so as to be relatively rotatable with respect to an inner race wherein two plate-like members overlay each other and a ball raceway surface is formed by curved portions formed in outer peripheries of the plate-like members. Balls are accommodated in the windows. The face of each of the windows on the side of the outer periphery of the outer race is formed as a cam surface wherein the distance with respect to the ball raceway surface is reduced in a circumferential direction. Urging means for urging the balls in the direction is disposed. The maximum width of the one-way clutch is equal to the ball diameter and the thicknesses of the two plate-like members constituting the inner race, so that a one-way clutch of a reduced width is obtained.

One way clutch

A retainer () arranged on an inner side of an outer ring () is formed with a projection () at an outer periphery thereof by being projected from one end side of the outer ring () to an outer side, a recess portion () is formed at a surface of a hole. () of a housing () which is a member for fitting the outer ring () and by fitting the projectionof the retainer () to the recess portion (), not only the outer ring () but also the retainer () can be constituted to be unable to rotate relative to the housing (), the relative rotation between the outer ring () and the retainer () are substantially made unable to carry out in the state via the housing ().

One-way clutch

The present invention is intended to provide a one-way clutch provided with a retainer which requires no crimping work in spite of using a metal spring and is superior in reliability and durability. In order to attain the object, the retainer is equipped with one ring-shaped portion having an outer circumferential surface to be fitted into the inner circumferential surface of an outer race, and the other ring-shaped portion having an outer diameter smaller than that of the one ring-shaped portion and having convex portions formed at constant intervals in the circumferential direction on the outer circumferential surface thereof, these two ring-shaped portions being connected with bar portions so as to form pockets each accommodating a roller between every two of the bar portions. A metal spring, which is equipped with a flange portion having concave portions on the inner circumferential side to be fitted over the convex portions formed on the retainer, leaf portions positioned in the pockets of the retainer, and convex portions having inner circumferential surfaces to be fitted over the outer circumferential surfaces of the bar portions, is fitted into the retainer.

A one-way clutch includes an annular retainer including sprag pockets formed in a plurality of portions of its side face in the circumferential direction, and spring mounting portions formed circumferentially adjacent to the sprag pockets; sprags to be fitted in the sprag pockets; and spring members mounted in the spring mounting portions for holding the sprags in predetermined positions in the sprag pockets. The one-way clutch is assembled by mounting the sprags and the spring members sideways of the retainer.

One-way clutch, roller bearing with one-way clutch, and method of

An assembly includes an overrunning clutch, a rolling bearing and a casing supporting them. An overrunning clutch-supporting portion of the casing has inwardly protruding portions that inter-engage with raised portions on an outer ring of the overrunning clutch in the direction of rotation of the outer ring. As a result, a clearance is defined between the inwardly protruding portions of the overrunning clutch-supporting portion and the raised portions of the outer ring. The overrunning clutch is automatically centered to a rotation shaft when used. An elastic ring is interposed in a predetermined compressed state between the outer ring and the overrunning clutch-supporting portion. Frictional resistance is produced between the outer ring and the overrunning clutch-supporting portion preventing the overrunning clutch from becoming shaky in the casing. The overrunning clutch is pressed against the casing by a spacer to produce the same frictional resistance between the overrunning clutch and the casing.

Overrunning clutch and a rolling bearing united in a casing

Cam surfaces are formed in the inner periphery of a cylindrical body of a shell. Rollers are moved against action of springs in the lock direction in which the space between the cam surfaces and a drive shaft becomes narrower, whereby the shell and the drive shaft are locked to transmit power from the drive shaft to a driven shaft. After transmission of the power, the rollers are radially and outwardly pressed against the inner periphery of the cam surfaces in the unlock direction in which the space between the cam surfaces and the drive shaft is wider, by co-action of a centrifugal force and a component force, thus a 'dancing phenomenon' is prevented. A flange of the shell is spline-engaged with the driven shaft, an annular abutment plate in the inner periphery of the flange is held between a step of the driven shaft by an axially movable sleeve fitted around the small diameter portion of the driven shaft and the drive shaft without an axially loose condition by a fixing member.

Overrunning clutch system

A one-way clutch comprises a plurality of rollers, a retainer having the same number of roller pockets as rollers, a cylindrical shell having the same number of cam grooves as rollers, and springs for normally biasing the rollers toward the cam grooves. The cam grooves are provided at the axially intermediate portion of the shell. The shell is provided at one end with a radially inwardly-turned flange and at the other end with a cylindrical boss portion having a smooth inner surface free of cam grooves. The retainer includes a pair of annular portions at either end and an axially intermediate portion provided with roller pockets. The annular portion which is inserted into the boss portion of the shell has a smooth cylindrical outer surface dimensioned to be pressingly fitted to the boss portion. Thus there are no gaps between the retainer and the shell at the boss portion of the shell, thereby sealing that end of the shell and preventing the outflow of grease and the entry of dust.

An overrunning clutch has a drive shaft, a driven shaft coaxial with the drive shaft and a cylindrical body secured to and coaxial with the driven shaft. The cylindrical body is arranged to surround a transmission section of the drive shaft and includes a plurality of cam surfaces formed in its inner peripheral surface. The cylindrical body acts as an overrunning clutch. Recesses are radially formed in the corresponding cam surfaces and adapted to hold rollers against the action of spring. A retainer is held within the cylindrical body and includes a plurality of roller pockets corresponding to the cam surfaces, a plurality of rollers rollingly disposed within the roller pockets and contactable with the inner peripheral surface of the cylindrical body and the peripheral surface of the transmission section of the drive shaft, and springs disposed within the roller pockets and adapted to urge the rollers in the direction in which the rollers are locked in the cam surfaces. The overrunning clutch is designed to firmly hold the rollers in such a position that they can race and to eliminate 'dancing phenomenon' of the rollers.

Overrunning clutch for preventing 'Dancing Phenomenon'

An overrunning clutch comprises a hollow drive shaft, a driven shaft including a large diameter portion and a small diameter portion loosely fit in the drive shaft, a cylindrical body having an inner peripheral surface in which cam surfaces are formed to function as an overrunning clutch and being splined to one end of the large diameter portion adjacent to the small diameter portion of the driven shaft, a retainer held within the cylindrical body, rollers held in roller pockets of the retainer, springs disposed in the roller pockets of the retainer to urge the roller, an annular abutment plate fit around the small diameter portion of the driven shaft and adapted to position the cylindrical body, and a fixing member fit around the small diameter portion of the driven shaft and adapted to fix the annular abutment plate in place. The overrunning clutch is thus simple and strong, and prevents 'dancing phenomenon' of the rollers by firmly holding the rollers in such a position that the rollers are free to race.

Overrunning clutch

A retainer which is for a one-way clutch and is made of a synthetic resin so that the retainer includes a pair of annular portions, a plurality of column portions disposed at equal intervals along the circumference of the retainer and coupling the annular portions to each other along the axis of the retainer, roller pockets defined by the annular portions and the column portions, and elastic members integrally provided on the sides of the column portions, to which rollers housed in the roller pockets are moved when the one-way clutch is disengaged. The other side of each of the column portions is formed with an inner and an outer projecting parts projecting toward the former side of the neighboring column portion. The width of each of the elastic members gradually decreases from the butt thereof toward the tip thereof. The former side of each of the column portions is formed with stoppers for limiting the elastic deformation of the elastic members toward the former side of the column portion. With this construction, the plastic deformation of the elastic member is avoided for a long period of time and the process and equipment for manufacturing the retainer can be made more rational and less expensive than those for the conventional retainer.

Growing community of inventors

Yamatotakada, Japan

Kazuo Iga