One-way clutch integrated with a rolling bearing

Details One-way clutch integrated with a rolling bearing One-way clutch integrated with a rolling bearing

2000-04-12

2001-10-16

Bonck, Rodney H. (Department: 3681)

192 clutches and power-stop control

Clutches

Automatic

C192S04100R

Reexamination Certificate

active

06302252

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to a one-way clutch integrated with a rolling bearing which is configured by integrating a sprag one-way clutch with a rolling bearing.
Usually, a one-way clutch integrated with a rolling bearing which is configured by integrating a sprag one-way clutch with a rolling bearing has a configuration in which a raceway surface for a rolling bearing, and that for a one-way clutch are respectively formed on the inner and outer races, plural rolling elements make rolling contact with the raceway surface for a rolling bearing, and plural sprags tiltably make contact with the raceway surface for a one-way clutch.
As such a one-way clutch integrated with a rolling bearing, a clutch of the type in which a raceway surface for a one-way clutch is formed in both the sides of a raceway surface for a rolling bearing has been practically used. In a clutch of this type, as a common cage which holds rolling elements and sprags at constant intervals in the circumferential direction, a cage which is configured by engagingly integrating two annular members in the axial direction with each other is used for the sake of convenience in an assembling process. As such a cage which is configured by engagingly integrating two annular members with each other, for example, known is a cage which is disclosed in Japanese Patent Publication (Kokai) No. HEI9-166161.
The cage of the one-way clutch integrated with a rolling bearing which is disclosed in the publication is configured in the following manner. As shown in an exploded perspective view of
FIG. 6
, in two annular members
61
and
62
, recesses
611
and
621
which, under state where the members are engaged with each other, configure pockets for housing rolling elements in the center portion are formed in one end side in the axial direction and at constant intervals in the circumferential direction. Pockets
612
and
622
for housing sprags are formed in the opposite end side. In one of the two annular members
61
and
62
, or the annular member
61
, a claw
613
which elongates in the axial direction is formed in several positions arranged along the circumferential direction. In the other annular member
62
, plural recesses
623
with which the claws
613
are to be fittingly engaged are formed. In an assembling process, a required number of rolling elements are inserted and arranged between the inner and outer races and at substantially constant intervals in the circumferential direction. Thereafter, the annular members
61
and
62
are inserted between the inner and outer races so as to sandwich the rolling members from the both sides in the axial direction. The claws
613
are respectively inserted into the recesses
623
so as to be engaged therewith, whereby the annular members are integrated with each other.
As exemplarily shown in a section view of
FIG. 7
taken in the axial direction under an engagement state, in each of the claws
613
and the recesses
623
, an inclined face
613
a
or
623
a
is formed in the tip end side, and an engaging portion
613
b
or
623
b
is formed in the basal end of the inclined face
613
a
or
623
a.
According to this structure, in an assembling process, the annular members
61
and
62
can be easily engaged with each other by snap fit, and, after assembling, the engagement state is prevented by the engagement of the engaging portions
613
b
and
623
b
from being easily cancelled.
In such a one-way clutch integrated with a rolling bearing, when an impact load or the like is applied to the two annular members
61
and
62
constituting the case, the claws
613
are bent in an inner radial direction (toward the axial center of the clutch). This may cause the engaging portions
613
b
and
623
b
to be disengaged from each other to cancel the engagement state of the two members.
SUMMARY OF THE INVENTION
The invention has been conducted in view of the above-mentioned circumstances. It is an object of the invention to provide a one-way clutch integrated with a rolling bearing which has a structure of integrating two annular members with each other by snap fit, which comprises a cage that commonly holds plural rolling elements of the rolling bearing, and plural sprags of the one-way clutch, in which, even when an impact load or the like is applied, a simple configuration can prevent the engagement state of the two annular members from being cancelled, and which has therefore excellent impact resistance and the like.
In order to attain the object, the one-way clutch integrated with a rolling bearing of the invention is a one-way clutch integrated with a rolling bearing in which plural rolling elements and sprags are arranged in an annular space between an inner race and an outer race in each of which a raceway surface for a one-way clutch is formed in both sides of a raceway surface for a rolling bearing, the rolling elements and the sprags make contact with corresponding one of the raceway surfaces, the rolling elements and the sprags are held at constant intervals in a circumferential direction by a common cage which is configured by engagingly integrating two annular members with each other in an axial direction, and the sprags are urged by springs in a locking direction in respective pockets of the cage, wherein a claw which elongates in the axial direction is formed in plural positions arranged along a circumferential direction in one of the two annular members constituting the cage, recesses with which the claws are to be fittingly engaged are formed in another one of the annular members, and a rib which elongates in the axial direction is formed in each of the claws and the recesses, the ribs being adjacent to each other in an engagement state to prevent the claws from being bent in an inner radial direction.
In the invention, interference between the axial ribs disposed in the claw and the recess blocks bending of the claw in an inner radial direction, without requiring stiffening such as thickening of the claw, and improves the substantial rigidity of the claw in the direction, thereby attaining the desired object.
Specifically, a rib which elongates in the axial direction is formed in each of the claw and the recess which are to be fitted in the axial direction to be engaged with each other, the ribs formed in the claw and the recess are made adjacent each other under the engagement state of the claw and the recess, and, when the claw is to be bent in an inner radial direction by an impact or the like, the ribs of the claw and the recess interfere with each other. According to this configuration, when the claw is to be bent in an inner radial direction, i.e., toward the axial center by an impact or the like, the ribs of the claw and the recess interfere with each other, and hence bending of the claw is blocked, with the result that the engagement of the claw and the recess can be prevented from being cancelled by bending of the claw.


REFERENCES:
patent: 3006447 (1961-10-01), Irwin
patent: 5664653 (1997-09-01), Kurita et al.
patent: 5819899 (1998-10-01), Iga et al.
patent: 6119838 (2000-09-01), Igari et al.
patent: 9-166161 (1997-06-01), None

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