Internal-combustion engines – Particular piston and enclosing cylinder construction – Cylinder detail
Reexamination Certificate
1998-01-26
2001-09-04
McMahon, Marguerite (Department: 3747)
Internal-combustion engines
Particular piston and enclosing cylinder construction
Cylinder detail
C123S193300
Reexamination Certificate
active
06283081
ABSTRACT:
SPECIFICATION
A cylinder structure of internal combustion engine
1. Technical Field
This invention relates to a cylinder structure of an internal combustion engine for use of such as automobile.
2. Background of the Arts
FIG. 3
shows a deck surface (plan view) of a cylinder block
1
, and a sectional view taken along with A—A line of
FIG. 3
is shown in the left side from a center line (a) in
FIGS. 1
,
2
and
4
, and a sectional view taken along with B—B line of
FIG. 3
is shown in the right side from the center line (a) in the same FIGS.
In FIG,
3
, reference numeral
2
shows a liner (a cylinder liner, or a sleeve),
3
designates a cylinder bore,
4
designates a water jacket,
5
designates head bolts which fasten a cylinder head (hereinafter referred as “bolts”) and
6
designates an oil passage. As to bolts, a plurality of bolts
5
are provided spacing each other at a given spacing.
This cylinder block
1
is of a siamese type, in which each barrel
7
(see
FIGS. 1
,
2
and
3
) of the cylinder block is connected each other, from view point of the structural feature, it is said that the rigidity around the area below a water jacket is high. As shown in FIG.
1
and so on, the liner
2
is pressed in the barrel
7
, with which a cooling water touches directly. This is a kind of a wet liner type of cylinder block, in which the barrel
7
covers a portion (lower circumference) of the liner
2
, which does not touch with the cooling water directly and is called as a dry liner type of cylinder block, so that, it can be called precisely a semi-wet liner type of cylinder block.
Hereinafter, based on
FIG. 4
a conventional cylinder structure is explained.
1
designates a cylinder block,
8
designates a cylinder head and
9
designates a lower case of a crank case. A gasket
9
is interposed between the cylinder block
1
and the cylinder head
8
. The cylinder head
8
is fastened to the cylinder block
1
due to a bolt
5
coming through a coming through hole
10
of the cylinder head
8
and being screwed in a screw hole
11
provided in the cylinder block
1
. And, in the area located in the portion of the right side of the center line (a), a location of the barrel
7
corresponds to the deepest portion of the water jacket
4
.
An area of the lower case
9
, which is mounted on the cylinder block
1
, is connected due to the bolt
13
coming through a bolt through hole
12
provided in the lower case
9
and being screwed in a screw hole
14
provided in the cylinder block
1
.
15
designates a crank shaft,
16
designates a main gallery,
17
designates a wall of a blow by gas passage and
18
designates a hole communicating the cylinder block
1
and the water jacket of the cylinder head
8
.
In the structure thus formed, the position, at which the screw position C of the bolt
5
is located, is located at an upper position of the cylinder block
1
. Since it is located near the upper face (deck surface) of the cylinder block
1
and also located near the water jacket
4
, the rigidity is low compared with the area of a central and lower portion of the cylinder block
1
, so that a large force is stressed on the area on which the bolt
5
is tightened. As a result, the area between the bolt
5
and another adjacent bolt
5
provided at a given spacing the first bolt
5
becomes small in a compacting rate of a gasket
9
to cause a compacting unevenness, thereby there have been threatened for cooling water, lubricant oil or combustion gas to be leaked from the gasket
9
portion. So that, in order to prevent from being leaked, an expensive gasket had to be used.
Further, since the portion to be tightened with the bolt
5
is acted by a force greater than other portions, a cylinder bore
3
in the vicinity of the screw portion of the bolt
5
is shrank in its diameter as shown in
FIG. 6
at upper position {circle around (1)}, and further a deformation from a circle to a non-circle is generated, which causes a lower position {circle around (2)} to be likely to have a tendency to be swelled in its diameter. In addition, the bore
3
not only shrinks in diameter or widens but also the center position (a center line is omitted) is happened to be displaced comparing the upper portion with the lower portion. Then, in order to avoid such deformation, as a counter measure a selection of the material or an increase in thickness has been considered.
For reference,
FIG. 6
shows an illustration emphasized in the mode of deformation by taking the unit of vertical dimension larger than the one of horizontal dimension, so that, the actual deformation of the cylinder bore
3
does not occur as shown.
As prior arts showing in the similar technical field, there are Japanese Patent Laid-open Publication No. Hei 8-21299 and Japanese Utility Model Laid-open Publication No. Hei 4-103245. In the former, a bolt is adapted to be screwed in a cylinder liner block to be die-cast in an aluminum alloy cylinder block, and in the latter, a lib is provided so as to connect the wall of each of cylinder bores and the outer wall of the cylinder block around each cylinder, then the bolt screw portion to tighten a cylinder head to the cylinder block is adapted to correspond to the lib. The techniques disclosed in these publications attain the pre-determined object respectively.
The present invention is to provide the structure having the constitution differed from said prior art, which is not affected by tightening the cylinder head to the cylinder block with bolts.
The present invention, as a means to solve the above problem, according to claim
1
, in an internal combustion engine, wherein a cylinder block and a cylinder head are connected with a bolt coming through the cylinder head, the means is characterized in that a part more than half of a screw portion of the bolt, which is screwed in the cylinder block, is adapted to be located under the area lower than the center portion of a water jacket.
The invention according to claim
2
, wherein a liner is further provided inside a cylinder bore and said water jacket is provided outside the liner provided on a cylinder bore.
REFERENCES:
patent: 2127825 (1938-08-01), Mader
patent: 3521607 (1970-07-01), Wiseman et al.
patent: 3659568 (1972-05-01), Howe
patent: 3842718 (1974-10-01), Malchow
patent: 4638769 (1987-01-01), Balheimer
patent: 4848292 (1989-07-01), Holtzberg
patent: 5598818 (1997-02-01), Domanchuk
patent: 5727512 (1998-03-01), Hutchins
Berkowitz Marvin C.
McMahon Marguerite
Nath Gary M.
Nath & Associates PLLC
Suzuki Motor Corporation
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