Severing by tearing or breaking – Breaking or tearing apparatus – Movable breaking tool
Reexamination Certificate
1999-08-30
2003-06-17
Ashley, Boyer D. (Department: 3724)
Severing by tearing or breaking
Breaking or tearing apparatus
Movable breaking tool
C225S097000, C225S100000, C225S096000, C029S413000, C029S888090
Reexamination Certificate
active
06578748
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pressurizing mechanism for a con'rod (connecting rod) used in a breaking and dividing device (fracture process) for the connecting rod of an internal combustion engine or the like.
DESCRIPTION OF THE PRIOR ART
The process of breaking and dividing a connecting rod, hereinafter referred to as a con'rod, as follows: As shown in
FIG. 5
, a con'rod
1
is made in prior art in such a way that a con'rod main body
2
and a bearing cap portion
3
are formed as one piece, for example, by sinter forging, and a notch
5
a
is made in a face which is to be divided. This face is on the inner surface of a bearing portion
5
on a large end portion
4
of the con'rod.
A small end portion of the con'rod
1
, as shown in FIG.
5
and
FIG. 6
, is fitted onto a small end reference pin
12
carried on a support stand
11
. Left and right seats
3
a
of the bearing cap portion
3
are mounted on a movable plate
14
on the bearing cap portion side of the large end portion
4
. The plate
14
is located face to face with a stationary plate
13
which is on the main body side of the large end portion
4
and both plate
13
and plate
14
are on the support stand
11
. Tips
15
a
of a movable pressing portion
15
are pressed to be in contact with seats
3
a.
Further, on the stationary plate
13
on the main body side, an escaping force receiving pin
16
is mounted so as to be in contact with a part of a shoulder
4
a
formed on the bearing cap portion
3
of the large end portion
4
of the con'rod
1
. When the con'rod is so mounted on platform
11
, a wedge
18
is forced into a split mold
17
fitted into the bearing portion
5
on the large end portion side, and consequently, the main body
2
and the bearing cap portion
3
are broken and divided at the notch
5
a.
Furthermore, reference numeral
19
denotes a guide plate for the movable plate
14
, which is fixed on the support stand
11
.
A mechanism in which the notch
5
a
is automatically formed so that breaking and dividing may securely be performed has been disclosed in Japanese Laid-Open Patent Application No. H6-91438. As described in that application, left and right expansion molds (a split mold) are provided face to face in the direction in which the main body and the bearing cap portion are to be separated from each other, in a large end hole, or bearing portion. A punch or wedge to be forced into a mid position thereof is provided, and breaking chips arranged with the tips facing to the inner surface of the large end hole bearing portion are provided at both ends at right angles to the direction in which the bearing cap portion is broken and separated by the punch. By forcing the punch (wedge), a load in the breaking and separating direction is given to the bearing cap portion or the like, and at the same time, the breaking chips
14
and
15
cause a concentrated load to be applied to the portion to be broken and separated. Accordingly, the part to be broken and separated can easily be deformed, and it is possible to securely make this part the breaking start point, and in the meantime, this can automatically be performed with no trouble by forcing the punch.
However, in a mechanism like the one described in the Publication, in which a notch is not formed in advance and a concentrated load is applied to the portion to be broken and separated by breaking chips from the inside of the large end hole (bearing portion) by utilizing the forcing of the punch (wedge) for giving a load in the breaking and separating direction to the bearing cap portion or the like, this concentrated load is applied suddenly in some cases, and therefore as shown in
FIG. 7
, the breaking and separating (dividing) are finished in the state shown by A, B where the breaking and separating are deviating from the line a—a passing through the face to be broken and divided in some cases, and there are some cases where it cannot be used as a con'rod.
SUMMARY OF THE INVENTION
The present inventors have found as a result of research that the breaking and dividing of a con'rod can be performed precisely at the face to be broken and divided and with only a small deformation, by performing the breaking and dividing while applying force to points on the outside of the bearing cap portion of the large end portion of a con'rod, and have reached the present invention.
It is an object of the present invention to provide a pressurizing mechanism for breaking and dividing a con'rod, in which a wedge is forced through a split mold into a bearing portion on the large end portion side of a con'rod made in such a way that the bearing cap portion included in the large end portion and the main body side to be connected to the cap portion are manufactured as one piece. Breaking and dividing the main body and the bearing cap portion is performed so that the main body and the bearing cap portion may be broken and divided precisely at the face to be broken and divided, and further, the deformation at that moment can be made minimum.
In order to achieve the above object, a pressurizing mechanism of the con'rod breaking and dividing device of the present invention includes a mechanism to press a point to be broken and divided on the outside of the large end portion of the con'rod. In addition, a wedge is forced through a split mold into a bearing portion on the large end portion side of a con'rod made in such a way that a bearing cap portion included in the large end portion and a main body side to be connected to the cap portion are formed as one piece so as to break and divide the main body and the bearing cap portion.
REFERENCES:
patent: 316430 (1885-04-01), Derby
patent: 1919801 (1933-07-01), Newsom
patent: 3998201 (1976-12-01), Miura et al.
patent: 5105538 (1992-04-01), Hoag et al.
patent: 5169046 (1992-12-01), Miessen et al.
patent: 5263622 (1993-11-01), Henzler et al.
patent: 5503317 (1996-04-01), Jones et al.
patent: 5568891 (1996-10-01), Hoag et al.
Japanese Patent Office—Patent Abstracts of Japan, “Manufacture of Connecting Rod and its Device” Publication No. 05277843 Oct. 26, 1993 Appl'n No. 04071354; Applicant: Mazda Motor Corp.; Inventor: Kameda Yoichi, et al.
Japanese Patent Office—Patent Abstracts of Japan, “Manufacture of Split Bearing” Publication No. 06091438 May 4, 1994 Appl'n No. 04248298; Applicant: Toyota Motor Corp.; Inventor: Okamoto Tomio.
Aihara Katsuaki
Matsuoka Hiroyuki
Watanabe Toshio
Zushi Hirotsugu
Ashley Boyer D.
Isuzu Motors Limited
Jones Tullar & Cooper P.C.
LandOfFree
Connecting rod breaking and dividing device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Connecting rod breaking and dividing device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Connecting rod breaking and dividing device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3159409