Machine element or mechanism – Elements – Pitmans and connecting rods
Reexamination Certificate
2000-03-06
2001-09-04
Luong, Vinh T. (Department: 3682)
Machine element or mechanism
Elements
Pitmans and connecting rods
C074S57900F, C092S187000, C123S197300
Reexamination Certificate
active
06282983
ABSTRACT:
GOVERNMENT USE
The invention described here may be made, used and licensed by the or for the U.S. Government for governmental purposes without paying me any royalty.
BACKGROUND
It is well known in the art of constructing internal combustion engines to provide oil passages within components such as pistons, wrist pins and connecting rods so that oil flows from one component to another, whereby the components form part of a fluid circuit. The connections or interfaces between these components, particularly where the oil flows from one component to another, can be the source of mechanical design problems. A case in point is the connection between a wrist pin and connecting rod in which the connecting rod has a curved saddle affixed in surface contact to a wrist pin. A conventional connecting rod having such a saddle is shown at reference numeral
1
in FIG.
17
. The connecting rod has a solid shaft
2
with through bore
3
, a head
4
for engaging a crank pin (not shown) and a saddle
5
for engaging a wrist pin shown in phantom at
14
. As can be seen in
FIG. 18
, shaft
2
has a generally “H” shaped cross section having a web
8
and flanges
9
. Saddle
5
has an orifice
7
that registers with bore
3
and has a pair of bolt holes
6
. Bolts (not shown) pass through holes
6
and engage pin
14
so that pin
14
and rod
1
are fixed together. As better seen in
FIG. 18
, saddle
5
has a total of three apertures, and the inventor herein believes that these holes contribute to the tendency for cracks to form in saddle
5
during engine operation.
SUMMARY
The invention is an improved assembly of a connecting rod and a wrist pin in an internal combustion engine or other item of machinery, wherein one feature of the assembly is a novel connection between the rod and the wrist pin. This connection is comprised of a threaded fastener such as a cap screw that passes through the connecting rod's saddle and into the wrist pin. The saddle has a single aperture, which accommodates the fastener. The use of a single aperture reduces the tendency for crack initiation and propagation in the saddle during engine operation. Threadingly receiving the fastener is a specially formed nut in conforming surface contact with the inner diametrical surface of the wrist pin. A through bore in the fastener communicates with a tube or chamber in the shaft of the connecting rod. The tube or chamber in turn communicates with an orifice in the connecting rod's head, which is at the opposite end of the connecting rod from the saddle. Oil or other fluid can enter the head and flow to the wrist pin or vice versa.
REFERENCES:
patent: 1787556 (1931-01-01), Smith
patent: 3695150 (1972-10-01), Salzmann
patent: 3789743 (1974-02-01), Sihon
patent: 4142500 (1979-03-01), Davis
patent: 4830589 (1989-05-01), Pareja
patent: 5279268 (1994-01-01), Brink et al.
patent: 6178873 (2001-01-01), Pierobon et al.
patent: 512776 (1937-12-01), None
Carter Clifford C.
Kuhn David L.
Luong Vinh T.
Soderling Gail S.
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