192 clutches and power-stop control – Clutches – Automatic
Reexamination Certificate
2002-07-16
2004-11-30
Bonck, Rodney H. (Department: 3681)
192 clutches and power-stop control
Clutches
Automatic
C060S345000, C192S11000B
Reexamination Certificate
active
06823973
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a ratchet one-way clutch and a stator using the ratchet one-way clutch for use in an automatic transmission, constructional machinery, agricultural machinery or the like.
2. Description of the Related Art
FIG. 4
is a partially sectional view, taken in a radial direction, of a stator
61
provided with a conventional sprag one-way clutch.
A structure of the stator
61
will be explained hereinbelow. The stator
61
comprises an impeller
67
, a one-way clutch
50
arranged on the inner peripheral side of the impeller
67
, and a bush
80
. Both axial ends of the one-way clutch
50
are supported by an inner radial portion
74
of the impeller
67
and the bush
80
. Further, both axial ends of the stator
61
are rotatably supported by a pair of thrust needle bearings
71
and
74
.
The sprag one-way clutch
50
assembled in the stator
61
comprises an inner race
52
, an outer race
53
arranged so as to be rotatable relative to and concentric with the inner race
52
, a plurality of sprags
54
arranged in an annular space defined by the inner race
52
and the outer race
53
for transmitting torque, a ribbon spring
55
rockably retaining the sprags
54
at regular intervals in a circumferential direction and biasing them in a meshing direction, and annular retainers
56
and
58
retaining the ribbon spring
55
.
The bush
80
is a member serving as a bearing of the inner race
52
and the outer race
53
, and is formed on the axially inner side thereof with an inner shoulder
81
and an outer shoulder
82
for receiving therein corners of the inner race
52
and the outer race
53
, respectively. The inner race
52
slides on the inner shoulder
81
. With the aid of both shoulders, the inner race
52
and the outer race
53
can be arranged concentrically with each other.
The stator
61
having the foregoing sprag one-way clutch transmits torque when a direction of relative rotation between the inner race
52
and the outer race
53
agrees with a meshing direction of the sprags
54
, while it idles and thus does not transmit torque in case of a non-meshing direction of the sprags
54
.
SUMMARY OF THE INVENTION
In recent years, the development has been active for reducing size, weight and cost of automobile parts such as an automatic transmission, and a one-way clutch is not exceptional. There has been proposed a ratchet one-way clutch responding to such a demand.
It is an object of the present invention to provide a ratchet one-way clutch which is reduced in the number of parts, reduced in size and improved in dimensional accuracy, and further provide a stator using such a ratchet one-way clutch. More specifically, it is an object of the present invention to provide a one-way clutch of a structure omitting the bush which has been required in the foregoing conventional one-way clutch, and further provide a stator using such a one-way clutch.
For accomplishing the foregoing objects, a ratchet one-way clutch according to the first aspect of the present invention comprises an inner race; an outer race arranged so as to be concentric with and rotatable relative to the inner race; concave portions formed along a circumferential direction on one of an outer periphery of the inner race and an inner periphery of the outer race; and a claw member to be fitted into one of the concave portions, a spring biasing the claw member relative to the concave portions, and a pocket formed on the other of the outer periphery of the inner race and the inner periphery of the outer race and receiving therein the claw member and the spring, wherein at least one of the inner race and the outer race has a bearing function.
In a ratchet one-way clutch according to another aspect of the present invention, a bearing portion is formed on at least one of the inner race and the outer race for allowing mutual sliding movement therebetween, and a predetermined clearance is provided between the inner race and the outer race.
In a ratchet one-way clutch according to another aspect of the present invention, the outer race is made of aluminum.
In a ratchet one-way clutch according to another aspect of the present invention, a projection for supporting the claw member axially is provided within the pocket.
A stator of the present invention uses any one of the foregoing ratchet one-way clutches.
REFERENCES:
patent: 4441315 (1984-04-01), Bochot
patent: 5632363 (1997-05-01), Kubo et al.
patent: 5855263 (1999-01-01), Fergle
patent: 5947245 (1999-09-01), Costin et al.
patent: 6338403 (2002-01-01), Costin et al.
patent: 6557681 (2003-05-01), Kinoshita et al.
patent: 6575275 (2003-06-01), Muramatsu et al.
Bonck Rodney H.
Miles & Stockbridge P.C.
NSK-Warner K.K.
LandOfFree
Ratchet one-way clutch and stator using ratchet one-way clutch does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ratchet one-way clutch and stator using ratchet one-way clutch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ratchet one-way clutch and stator using ratchet one-way clutch will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3354936