Lubrication – Systems – Gearing
Reexamination Certificate
2000-07-21
2002-11-05
Kim, Chong H. (Department: 3682)
Lubrication
Systems
Gearing
C384S462000, C384S473000, C074S467000
Reexamination Certificate
active
06474444
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a taper roller bearing lubricating structure in a transmission, and more specifically to a taper roller bearing lubricating structure for supporting an output gear in an automatic transmission for motor vehicles.
A Japanese Patent Kokai Publication No. H2(1990)-89871 shows a conventional lubricating structure for an automatic transmission.
In this structure, as shown in
FIG. 7
, a taper roller bearing
36
rotatably supports, on a partition wall
45
, an output gear
31
which endures a great torque on the output side of a planetary gear system. Each of tapered rollers
32
and
33
can support a load acting in the radial direction with its rolling contact surface
32
a
or
33
a
along a line instead of a point as in a ball bearing. A load in a thrust direction can be supported by the rolling contact surface
32
a
or
32
b
and the end surface
32
b
or
33
b
of each tapered roller
32
or
33
together with an inner lace
39
contacting with these surfaces.
An oil passage
30
is formed in an outer race
40
, for lubricating the tapered rollers
32
and
33
.
SUMMARY OF THE INVENTION
This conventional lubricating structure has an oil passage
46
specifically formed in the partition wall
45
, for lubrication of the taper roller bearing
36
. However, according to our findings, the lubrication for the tapered rollers
33
still tends to be insufficient, specifically in the end surfaces
33
b
of the tapered rollers
33
on the side remoter from the output gear
31
.
It is an object of the invention to provide a taper roller bearing lubricating structure capable of supplying sufficient lubricating oil to tapered rollers without complicating the manufacturing process.
It is another object of the invention to provide a taper roller bearing lubricating structure capable of supplying sufficient lubricating oil specifically to tapered rollers remote from an output gear without complicating the manufacturing process.
According to the present invention, a lubricating structure for an automatic transmission comprises:
an output gear having a gear portion for delivering an output rotation of the automatic transmission, and a hollow boss;
an inner rotating shaft disposed inside the boss of the output gear and formed with a lubricating oil passage;
a taper roller bearing disposed around the boss of the output gear;
an outer support surrounding and supporting the taper roller bearing; and
a dam forming an oil reservoir for storing a lubricating oil from the oil passage in the rotating shaft, the oil reservoir being formed radially between the boss of the output gear and the outer support, and axially between the dam and the taper roller bearing which is located axially between the gear portion of the output gear and the dam.
According to another aspect of the present invention, an automatic transmission comprises:
an output gear having a gear portion for delivering an output rotation of the automatic transmission, and a hollow boss;
a taper roller bearing having a plurality of tapered rollers arranged around the boss of the output gear;
an inner rotating shaft received inside the boss of the output gear and formed with a lubricating oil passage; and
an outer non-rotational annular portion surrounding and supporting the taper roller bearing; and
a dam forming an oil reservoir for storing a lubricating oil supplied from the oil passage in the inner rotating shaft, the dam extending from the annular portion radially inwardly to a projecting dam end located on an imaginary cylindrical surface which passes through the tapered rollers.
REFERENCES:
patent: 2240118 (1941-04-01), Matthews
patent: 2654441 (1953-10-01), Orr et al.
patent: 4494638 (1985-01-01), Zenker
patent: 4541738 (1985-09-01), Leibensperger et al.
patent: 4597679 (1986-07-01), Wlodkowski
patent: 4656885 (1987-04-01), Hori et al.
patent: 4677871 (1987-07-01), Taniyama et al.
patent: 4739678 (1988-04-01), Miura et al.
patent: 5232291 (1993-08-01), Juan
patent: 5520468 (1996-05-01), Iguchi
patent: 5553927 (1996-09-01), Mastrangelo
patent: 5597370 (1997-01-01), Nogle
patent: 5904427 (1999-05-01), Braun et al.
patent: 606813 (1948-08-01), None
patent: 2-89871 (1990-03-01), None
patent: 02089871 (1990-03-01), None
patent: 07208586 (1995-08-01), None
patent: 8-86348 (1996-04-01), None
patent: 09105450 (1997-04-01), None
patent: 10047360 (1998-02-01), None
patent: 11-270565 (1999-10-01), None
Foley & Lardner
Jatco Transtechnology Ltd.
Kim Chong H.
LandOfFree
Taper roller bearing lubricating structure does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Taper roller bearing lubricating structure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Taper roller bearing lubricating structure will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2992194