192 clutches and power-stop control – Clutches – Automatic
Reexamination Certificate
2002-09-11
2004-05-11
Lorence, Richard M. (Department: 3681)
192 clutches and power-stop control
Clutches
Automatic
C192S055610, C192S113320, C060S345000
Reexamination Certificate
active
06732844
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a ratchet one-way clutch used in an automatic transmission, a building machine, an agricultural machine and the like, and a stator using such a ratchet one-way clutch.
2. Related Background Art
FIG. 16
is a front view of a stator
101
having a conventional ratchet one-way clutch.
Now, a construction of such a stator
101
will be explained. The stator
101
comprises a vane wheel
107
and a one-way clutch
115
disposed inside the vane wheel
107
.
The ratchet one-way clutch
115
incorporated into the stator
101
includes an inner race
102
, an outer race
103
disposed for relative rotation with respect to the inner race
102
and concentric with the latter, pawl members
104
housed in pockets
112
of the outer race
103
and adapted to transmit torque, and biasing springs
105
for biasing the respective pawl members
104
radially inwardly, and the inner race
102
is provided at its outer periphery with recessed portions
106
into which the pawl members
104
can fit.
Further, the outer race
103
is provided at its inner periphery with stress relieving recessed portion
130
for dispersing stress generated when the pawl members
104
fit into the recessed portions
106
.
The outer race
103
directly abuts against an outer peripheral surface and side surfaces of the inner race
102
, so that relative rotation between the outer race
103
and the inner race
102
is permitted. The inner race
102
and the outer race
103
include portions having a sliding bearing function.
First recessed portions
119
for containing damper springs
108
are formed in an outer peripheral surface of the outer race
103
equidistantly along a circumferential direction, and recessed portions
129
corresponding to the first recessed portions are formed in an inner peripheral surface of the vane wheel
107
equidistantly along the circumferential direction. Each of the damper springs
108
extends in the circumferential direction and has one end abutting against a side wall of the first recessed portion
119
provided in the outer race
103
substantially perpendicular to the circumferential direction and the other end abutting against a side wall of the recessed portion
129
provided in the vane wheel
107
substantially perpendicular to the circumferential direction.
Further, second recessed portions
110
are formed in the outer peripheral surface of the outer race
103
. Projections
109
which can protrude into the second recessed portions
110
are provided on an inner peripheral surface of the vane wheel
107
at positions corresponding to the second recessed portions
110
. When the vane wheel
107
is rotated relatively with respect to the outer race
103
, the damper springs
108
are flexed, and, before contraction permitting amounts of the damper springs
108
are reached, the projections
109
of the vane wheel
107
abut against the second recessed portions
110
. Thus, flexed amounts of the damper springs
108
are limited, thereby preventing yielding and damage of the damper springs
108
. Namely, a damper mechanism
116
is constituted by the first and second recessed portions of the outer race
103
and the recessed portions
129
and the projections
109
of the vane wheel.
With the above-mentioned arrangement, shock generated when the pawl members
104
of the one-way clutch
115
are fitted into the recessed portions
106
of the inner race
102
is transmitted from the outer race
103
to the damper springs
108
and is absorbed by the damper springs
108
. Even if the shock generated when the pawl members
104
are fitted into the recessed portions
106
is so great that it cannot be absorbed by the springs, the second recessed portions
110
of the outer race
103
lock the projections
109
of an inner ring
117
, thereby limiting the flexed amounts of the damper springs
108
. Thus, the yielding and damage of the damper springs
108
can be prevented.
In the stator having the above-mentioned ratchet one-way clutch
115
, when a direction of the relative rotation between the inner race
102
and the outer race
103
is a direction for achieving engagement of the pawl members
104
, the torque is transmitted; whereas, then the direction is a direction for not achieving engagement of the pawl members
104
, idle rotation is generated, with the result that the torque is not transmitted.
In the above-mentioned conventional stator, because of wear due to a sliding movement between the pawl member and the outer race and wear of bearing mechanisms constructed between the inner race and the outer race and between the inner race and the vane wheel, there was a tendency that metallic powder generated by the wear of various parts and foreign maters such as dirt are accumulated within the one-way clutch for example, within the stress relieving recessed for relieving the stress generated by the engagement of the pawl members.
If the foreign matters exist within the one-way clutch or the stator, not only an operation of the one-way clutch or the stator may be obstructed, but also various parts constituting the one-way clutch or the stator may be damaged.
SUMMARY OF THE INVENTION
An object of the present invention is to a stator in which metallic powder generated by wear of bearing mechanisms between pawl members and an outer race and between an inner race and the outer race and between the inner race and a vane wheel and foreign matters such as dirt within a ratchet one-way clutch of the stator are discharged outside, thereby preventing a poor operation.
Another object of the present invention is to provide a stator in which a good assembling ability for damper springs can be achieved.
To achieve the above objects, according to one aspect of a one-way clutch of the present invention, there is provided a ratchet one-way clutch comprising an inner race, an outer race disposed for a relative rotation respect to the inner race and in concentric with the latter, a recessed portion formed in one of an outer periphery of the inner race and an inner periphery of the outer race along a circumferential direction, a pawl member formed on the other of the outer periphery of the inner race and the inner periphery of the outer race and adapted to be fitted into the recessed portion, a spring for biasing the pawl member toward the recessed portion, and a pocket for containing the pawl member and the spring, and wherein a discharge path is formed in the outer race.
Since the discharge path is formed in the outer race, metallic powder generated by wear between various member constituting the one-way clutch can be discharged.
According to another aspect of the one-way clutch of the present invention, the discharge path is a groove extending in a radial direction of the outer race.
According to a further aspect of the one-way clutch of the present invention, the discharge path is communicated with a recess for relieving stress provided in an inner periphery of the outer race.
According to a still further aspect of the one-way clutch of the present invention, the discharge path is a hole passing through the outer race in an axial direction.
According to a further aspect of the one-way clutch of the present invention, there are provided an inner race, an outer race disposed for a relative rotation respect to the inner race and in concentric with the latter, a recessed portion formed in one of an outer periphery of the inner race and an inner periphery of the outer race along a circumferential direction, a pawl member formed on the other of the outer periphery of the inner race and the inner periphery of the outer race and adapted to be fitted into the recessed portion, a spring for biasing the pawl member toward the recessed portion, a pocket for containing the pawl member and the spring, and a pocket formed in an outer periphery of the outer race and adapted to contain a damper spring, and the pocket for containing the damper spring is provided with an assembling window passing through the outer race in an
Lorence Richard M.
Miles & Stockbridge P.C.
NSK-Warner K.K.
LandOfFree
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