192 clutches and power-stop control – Clutches – Automatic
Reexamination Certificate
2001-01-25
2003-05-06
Rodriguez, Saul (Department: 3681)
192 clutches and power-stop control
Clutches
Automatic
C192S10700R
Reexamination Certificate
active
06557681
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to improvements in a one-way clutch used in the transmission of an automobile, an agricultural machine, a construction machine, an industrial machine or the like, and particularly the automatic transmission of a vehicle or the like, and performing the function of a backstop. More particularly, it relates to a ratchet type one-way clutch using a ratchet (pawl) in a lock mechanism and a method of manufacturing the same.
2. Related Background Art
Generally, a one-way clutch used in an automatic transmission has an outer ring and an inner ring rotated relative to each other, and a sprag or a roller for transmitting torque between the outer ring and the inner ring meshes with a cam surface provided on the raceway surface of the outer ring or the inner ring to thereby transmit rotational torque only in one direction. Also, design is made such that the outer ring and the inner ring are idly rotated in the opposite direction.
Such one-way clutches include a ratchet type one-way clutch using a ratchet as a torque transmitting member for transmitting torque between the outer ring and the inner ring. Generally, the ratchet type one-way clutch is comprised of an outer ring having a pocket in the inner periphery thereof, an inner ring disposed coaxially with the outer ring and having a notch in the outer periphery thereof, a pawl contained in the aforementioned pocket, fitted in the notch of the inner ring and bringing the one-way clutch into its locked state to thereby transmit torque between the inner ring and the outer ring, and a resilient member for biasing the pawl toward the inner ring.
FIG. 14
of the accompanying drawings is an axial fragmentary cross-sectional view of the side plate
190
and outer ring
130
of a ratchet type one-way clutch according to the prior art. A pocket
131
for containing a pawl therein is formed in the inner periphery of the outer ring
130
. Also, in a state wherein an inner ring and the outer ring are combined together, the side plate
190
abuts against an axial side of the outer ring
130
to thereby regulate the axial movement of the pawl.
Further, it is conceivable to provide, as means for preventing the circumferential relative movement of the outer ring
130
and the side plate
190
, a mountain portion
195
on the outer peripheral portion of the side plate
190
and a valley portion
138
in the outer peripheral surface of the outer ring
130
, and fit the mountain portion
195
into the valley portion
138
.
According to the above-described construction, it is necessary to provide the mountain portion
195
and valley portion
138
only for fitting the side plate
190
to the outer ring
130
in the side plate
190
and outer ring
130
constituting the ratchet type one-way clutch, and this leads to the problem that such clutch is of a shape difficult to work and the cost for the working becomes high.
In the ratchet type one-way clutch of the above-described construction, when the one-way clutch rotates in one direction, the pawl slides freely relative to the outer periphery of the inner ring and therefore, the outer ring and the inner ring idly rotate relative to each other. Next, when the one-way clutch is about to rotate in the other direction, the pawl fits in the notch and the one-way clutch assumes a locked-up state.
Usually, the outer ring of the ratchet type one-way clutch is made of aluminum, but it was not always satisfactory in respect of durability due to, for example, pivotal movement or the like repeated by the pawl in the pocket provided in the outer ring.
Also, the pawl of the ratchet type one-way clutch has a recess having a shape substantially complementary thereto, and fits in a notch formed in the outer periphery of the inner ring. However, satisfaction was not always obtained in respect to durability due to the meshing performance of the ratchet and for example, pivotal movement repeated by the pawl in the pocket provided in the outer ring.
SUMMARY OF THE INVENTION
So, it is an object of the present invention to improve durability in a ratchet type one-way clutch of which the outer ring is made of aluminum.
It is another object of the present invention to improve the meshing performance of a ratchet type one-way clutch to thereby improve the durability of the ratchet type one-way clutch.
It is still another object of the present invention to provide a ratchet type one-way clutch of which the construction of the side plate and outer ring can be simplified and in which the working step therefor can be simplified.
In order to achieve the above objects, the ratchet type one-way clutch of the present invention is a ratchet type one-way clutch comprised of an outer ring having a pocket in the inner periphery thereof, an inner ring disposed coaxially with the outer ring and having a notch in the outer periphery thereof, a pawl contained in the pocket and fitted in the notch of the inner ring and transmitting torque between the inner ring and the outer ring, and a resilient member for biasing the pawl toward the inner ring, characterized in that the outer ring is made of aluminum and the inner peripheral surface of the outer ring is subjected to a hardening process.
Also, in order to achieve the above objects, the ratchet type one-way clutch of the present invention is a ratchet type one-way clutch comprised of an outer ring having a pocket in the inner periphery thereof, an inner ring disposed coaxially with the outer ring and having a notch in the outer periphery thereof, a pawl contained in the pocket and fitted in the notch of the inner ring and transmitting torque between the inner ring and the outer ring, and a resilient member (
50
) for biasing the pawl toward the inner ring, characterized in that the pressure receiving surface of the notch has a predetermined angle of inclination with respect to a line linking the point of intersection between surfaces constituting the notch and the center of the inner ring together.
In order to achieve the above objects, the ratchet type one-way clutch of the present invention comprises an outer ring having a pocket in the inner periphery thereof, an inner ring disposed substantially concentrically with the outer ring and having a notch in the outer periphery thereof, a pawl contained in the pocket for transmitting torque between the inner ring and the outer ring, a resilient member for biasing the pawl toward the inner ring, and a side plate for limiting the axial movement of the pawl, and is characterized in that the side plate is provided with a convex portion fitted into the pocket.
Also, in order to achieve the above objects, the method of manufacturing a ratchet type one-way clutch of the present invention is a method of manufacturing a ratchet type one-way clutch having an outer ring having a pocket in the inner periphery thereof, an inner ring disposed coaxially with the outer ring and having a notch in the outer periphery thereof, a pawl contained in the pocket and fitted in the notch of the inner ring for transmitting torque between the inner ring and the outer ring, and a resilient member for biasing the pawl toward the inner ring, characterized by the steps of:
molding the outer ring from aluminum by diecasting; and
subjecting the surface of the inner peripheral side of the outer ring to a hardening process.
Also, the method of manufacturing a ratchet type one-way clutch of the present invention is a method of manufacturing a ratchet type one-way clutch having an outer ring having a pocket in the inner periphery thereof, an inner ring disposed coaxially with the outer ring and having a notch in the outer periphery thereof, a pawl contained in the pocket and fitted in the notch of the inner ring for transmitting torque between the inner ring and the outer ring, and a resilient member for biasing the pawl toward the inner ring, characterized in that the arcuate portion of the pocket is molded by plastic working.
According to the ratchet type one-way clutch of the present invention, the surface of th
Kinoshita Yoshio
Muramatsu Kazuhiko
Shirataki Hirobumi
Miles & Stockbridge P.C.
NSK-Warner K.K.
Rodriguez Saul
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