192 clutches and power-stop control – Clutches – Automatic
Reexamination Certificate
1998-11-17
2001-08-28
Bonck, Rodney H. (Department: 3681)
192 clutches and power-stop control
Clutches
Automatic
C192S11000B
Reexamination Certificate
active
06279708
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a rolling bearing integrally containing a one-way clutch.
Conventionally, an one-way clutch (hereinafter simply described as OWC) part
100
, which has a function of transferring torque only in one direction and racing in the other (opposite) direction when inner and outer races rotate, has been known. The one-way clutch has been used independently or in combination with a rolling bearing
200
for supporting a load as a single part or an assembly. For example, these conventional assembly of the OWC part
100
and the rolling bearing
200
has been suggested in Japanese Patent Examined Publication No. Hei. 6-23579 shown in
FIG. 14
or Japanese Utility Model Examined Publication No. Hei. 7-52430 shown in FIG.
15
.
In recent years, demand for compacting bearings has been made with upsizing of a basket of a washing machine. On the other hand, the conventional technique using the OWC part
100
independently or in combination with the rolling bearing
200
cannot precisely meet such demand for compacting bearings, because the OWC part
100
and the rolling bearing
200
are juxtaposed in adjacent to each other as a single unit or an assembly.
In addition to this, it is difficult for the conventional technique to reduce a manufacturing cost because of a large number of parts, an increase in the number of assembling steps, etc.
Further, with the assembly, careful handling is required in such a manner that the components are not disassembled when the rolling bearing
200
and the OWC part
100
are fitted or when the assembly is fitted into a rotation shaft.
Furthermore, in addition to the demand for compacting, silent washing machines are demanded as market needs and silence is also required for bearings installed in the washing machines
SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide an OWC containing rolling bearing which meets the demand for compacting an OWC containing bearing and is reduced in costs and easily handled at the assembly process and installation process.
It is another object of the invention to improve silence of bearings.
The above-mentioned object can be attained by a one-way clutch containing rolling bearing, according to the present invention, which comprises:
a common inner race;
a common outer race;
a bearing part including a plurality of rolling elements;
a one-way clutch part including a plurality of wedge elements and a spring element, the bearing part and the one-way clutch part sharing the common inner race and the common outer race; and
a single cage disposed between the common inner race and the common outer race for holding the rolling elements and the wedge elements.
In the above-mentioned one-way clutch containing rolling bearing, it is preferable that each of surfaces of said inner race and said outer race which are brought in slide-contact with said wedge elements has surface roughness of 0.6 &mgr;mRa or less.
Further, the above-mentioned object can be attained by a one-way clutch containing rolling bearing, according to the present invention, which comprises:
an inner race;
an outer race;
a plurality of rolling elements rotatably disposed between the inner race and the outer race;
one-way clutch elements disposed between the inner race and the outer race and each changeable its posture between a first position preventing a relative rotation between the inner race and the outer race when the inner race is moved relative to the outer race in a first direction and a second position allowing the relative rotation when the inner race is moved relative to the outer race in a second direction opposite to the first direction; and
a common cage disposed between the inner race and the outer race for holding the rolling elements and the one-way clutch elements.
In the above-mentioned one-way clutch containing rolling bearing according to the present invention, it is preferable to further comprise a spring member which urges each of the one-way clutch elements to the first position.
In the above-mentioned one-way clutch containing rolling bearing according to the present invention, it is preferable that each of the one-way clutch elements includes in a cross-section a first portion which is always brought in slide-contact with the inner peripheral surface of the outer race and a second portion which is always brought in slide-contact with the outer peripheral surface of the inner race when the posture of the one-way clutch element is in the first position, in which a distance between the first portion and the second portion is longer than a distance between the inner peripheral surface of the outer race and the outer peripheral surface of the inner race in a radial direction of the bearing.
In addition, in the above-mentioned one-way clutch containing rolling bearing according to the present invention, it is preferable that the one-way clutch elements include a plurality of wedge elements.
Further, in the above-mentioned one-way clutch containing rolling bearing according to the present invention, it is preferable that at least one of the outer peripheral surface of the inner race and the inner peripheral surface of the outer race, which is brought in face-contact with the wedge element, has a surface roughness of 0.6 &mgr;mRa or less.
Furthermore, in the above-mentioned one-way clutch containing rolling bearing according to the present invention, it is advantageous that both the outer peripheral surface of the inner race and the inner peripheral surface of the outer race, which are respectively brought in face-contact with the wedge element, have a surface roughness of 0.6 &mgr;mRa or less.
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patent: 5438733 (1995-08-01), Melcher et al.
patent: 5676226 (1997-10-01), Lampela et al.
patent: 5711738 (1998-01-01), Abe et al.
patent: 5819899 (1999-11-01), Iga et al.
patent: 5860749 (1999-01-01), Hirakawa et al.
patent: 5989694 (1999-11-01), Mitamura et al.
patent: 5991977 (1999-11-01), Weber
patent: 8-159165 (1996-06-01), None
patent: 9-014302 (1997-01-01), None
patent: 9-105430 (1997-04-01), None
patent: 9-158965 (1997-06-01), None
Fukuda Naoki
Igari Kouzaburo
Ogawa Takashi
Takei Kenji
Tateishi Masanori
Bonck Rodney H.
Lewis Tisha D.
NSK Ltd.
Sughrue Mion Zinn Macpeak & Seas, PLLC
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