Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2000-06-15
2002-04-16
Temai, Karl (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S100000, C192S046000
Reexamination Certificate
active
06373157
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a stator for use, for example, in a torque converter of an automatic transmission for an automobile.
RELATED ART
FIGS. 19 and 20
illustrate a stator described in U.S. patent application Ser. No. 09/466,854. In this stator, a notched type one-way clutch
57
is constituted by a strut
54
and a notched plate
55
, the strut
54
being accommodated, together with a coiled spring
53
, in a pocket portion
52
formed in a resinous stator body
51
, the notched plate
55
being combined with the stator body
51
in a relatively rotatable manner and having an engaging recess
56
with which the strut
54
comes into engagement in one rotational direction. In the pocket portion
52
, moreover, a swing angle limiting portion
58
for limiting a swing motion of the strut
54
up to a predetermined angle is formed integrally by molding.
In the stator illustrated in
FIGS. 19 and 20
, however, a relatively large spacing
59
is formed between the strut
54
and the swing angle limiting portion
58
and in a rotational direction (the right and left direction in the figures) of the stator, there arises the following problem.
When the notched plate
55
rotates (in arrow A direction) relatively with respect to the stator body
51
in a direction in which the one-way clutch
57
runs idle, the strut
54
is dragged by the notched plate
55
and moves in the same direction within the pocket portion
52
, which movement may continue up to the position indicated with a chain line in FIG.
19
. In this case, an engaging portion
54
a
of the strut
54
comes into strong contact at a tip end thereof with an anti-engaging face
52
a
of the pocket portion
52
, so that the anti-engaging face
52
a
wears gradually, which may impede the operation of the clutch
57
.
According to the structure of the stator shown in
FIGS. 19 and 20
, the strut
54
, which is accommodated in the pocket portion
52
together with the coiled spring
53
, is in direct contact with a bottom
52
b
of the pocket portion
52
. Therefore, when the strut
54
swings with idle running of the clutch
57
, the strut
54
slides on the bottom
52
of the pocket portion
52
. As this sliding motion is repeated, the bottom
52
b
of the pocket portion
52
wears gradually, which may impede the operation of the clutch
57
.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a stator capable of preventing wear of such inner faces as the non-engaging face and bottom of the pocket portion and hence capable of preventing the operation of the one-way clutch from being impeded by such wear.
For achieving the above-mentioned object, according to claim
1
in the present invention there is provided a stator including a notched type one-way clutch, the notched type one-way clutch having a strut which is accommodated, together with a spring, within a pocket portion formed in a resinous stator body and also having a notched plate, the notched plate being combined with the stator body in a relatively rotatable manner and provided with an engaging recess with which the strut comes into engagement in one rotational direction, with a swing angle limiting portion being formed in the pocket portion to limit a swing motion of the strut up to a predetermined angle, and wherein a movement limiting portion for limiting the movement of the strut toward an anti-engaging face side within the pocket portion is formed on an engaging face side of the swing angle limiting portion integrally by molding.
According to claim
2
in the present invention there is provided, in combination with the above claim
1
, a stator wherein a spring is disposed between a bottom of a spring mounting portion and an engaging portion of the strut accommodated in the pocket portion in such a manner that the spring can expand and contract axially of the stator, the spring mounting portion being in the shape of a bottomed hole which is open to an end face of the swing angle limiting portion.
According to claim
3
in the present invention there is provided, in combination with the above claim
2
, a stator wherein the notched plate-side face of the engaging portion of the strut is formed in a generally
shape in section comprising a base end-side slant face and a tip end-side slant face, the tip end-side slant face being smaller in the angle of inclination than the base end-side slant face and being pushed against the notched plate by the resilience of the spring during idle running of the clutch.
According to claim
4
in the present invention there is provided, in combination with the above claim
2
, a stator wherein the strut is formed so that an end portion of the strut located on a rearmost side in the relative rotation, which end portion comes into contact with an end face portion of the notched plate during idle running of the clutch, is positioned on a front side in the relative rotation with respect to an axis of the spring mounted in the bottomed hole-like spring mounting portion.
According to claim
5
in the present invention there is provided, in combination with the above claim
2
, a stator wherein the strut is formed so that an end portion of the strut located on a rearmost side in the relative rotation, which end portion comes into contact with an end face portion of the notched plate during idle running of the clutch, is positioned at the same circumferential position as an axis of the spring mounted in the bottomed hole-like spring mounting portion.
According to claim
6
in the present invention there is provided, in combination with the above claim
4
or claim
5
, a stator wherein a cutout portion is formed in a tip end of the engaging portion of the strut to realize the structure described in claim
4
or claim
5
.
According to claim
7
in the present invention there is provided a stator including a notched type one-way clutch, the notched type one-way clutch having a strut which is accommodated, together with a spring, within a pocket portion formed in a resinous stator body and also having a notched plate, the notched plate being combined with the stator body in a relatively rotatable manner and provided with an engaging recess with which the strut comes into engagement in one rotational direction, with a swing angle limiting portion being formed in the pocket portion to limit a swing motion of the strut up to a predetermined angle, the spring being formed by a plate spring, the plate spring having an inner surface reinforcing portion formed integrally by molding and interposed between the strut and a bottom of the pocket portion.
As in the stator of claim
1
constructed as above, if a movement limiting portion for limiting the movement of the strut in a direction of an anti-engaging face within the pocket portion is formed on an engaging face side of the swing angle limiting portion in the pocket portion integrally by molding, it becomes possible to limit the strut movement toward the anti-engaging face side and prevent the strut from contacting the anti-engaging face. Out of both end faces in the rotational direction within the pocket portion, the one which supports the strut in an engaged state of the one-way clutch corresponds to the engaging face, while the opposite face corresponds to the anti-engaging face.
In the stator of claim
2
constructed as above, since a spring is disposed between the bottom of a bottomed hole-like spring mounting portion which is open to an end face of the swing angle limiting portion and an engaging portion of the strut accommodated in the pocket portion, the spring thus disposed being capable of expanding and contracting axially of the stator, the strut and the spring can be mounted completely in the pocket portion merely by first inserting the spring into the spring mounting portion and then putting the strut on the spring. Thus, the spring compressing work can be omitted at the time of mounting the strut.
In the stator of claim
3
constructed as above, since the notched plate-side face of the engaging portion of the st
Jacobson & Holman PLLC
NOK Corporation
Temai Karl
LandOfFree
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