Cylinder block structure

Details Cylinder block structure Cylinder block structure

2001-12-14

2003-11-18

Gimie, Mahmoud (Department: 3747)

Internal-combustion engines

Frame construction

Horizontal cylinder

C123S1950HC

Reexamination Certificate

active

06647944

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cylinder block structure in a V-type engine. More particularly, the present invention relates to a cylinder block structure in which a means for resisting distorting horizontal forces during engine operation is introduced, wherein such means includes a bulge portion extending away from at least one side of the walls of a crank case.
2. Description of the Related Art
Conventional internal combustion vehicle engines include in-line cylinder engines, opposed-cylinder engines, and V-type engines. V-type engines have cylinder banks disposed in a relative V-shape.
Alternative configurations exist for V-type engines. In one configuration, an upper surface of a crank case mounts on a lower surface of a V-shaped cylinder block. In this configuration, an oil pan mounts on the lower surface of the crank case, and the V-shaped cylinder block supports a crank shaft in cooperation with bearing caps integrated with the crank case. In this configuration, a first and a second cylinder head are positioned on the upper surfaces of a first and a second cylinder bank.
Referring now to
FIG. 8
, a V-type engine
102
includes a first through an eighth cylinder (#'s
1
to #
8
not shown) disposed in a V-shaped cylinder block
104
(alternatively referred to as cylinder block
104
).
Cylinder banks
106
A and
106
B are symmetrical on one-side and an opposite-side of an engine center line EC in V-shaped cylinder block
104
. Cylinder banks
106
A are centered on a one-side cylinder center line CA. Cylinder banks
106
B are centered on an opposite-side cylinder center line CB.
Cylinder heads
108
A and
108
B are symmetrical on one-side and an opposite-side of engine center line EC. A bearing construction member
110
is below cylinder heads
108
A,
108
B.
A crank case
112
supports V-shaped cylinder block
104
. A set of bearing caps
114
(referred to as bearing caps
114
) are on crank case
112
. A crank shaft
116
(shown later) drives the first through eights cylinders, as will be explained. Bearing construction member
110
includes crank case
112
integrated with bearing caps
114
.
An oil pan
118
is located below V-shaped cylinder block
104
and bearing construction member
110
, to aid oil circulation during engine operation.
Conventionally, cylinder block
104
and crank case
112
are formed from aluminum. Bearing caps
114
are usually iron.
One-side cylinder bank
106
A includes one-side cylinders
120
A, specifically, the first, third, fifth, and seventh cylinders (that is, the cylinders identified with odd numbers) in one-side cylinder bank
106
A. One-side cylinders
120
A extend in a lengthwise direction along one-side cylinder bank
106
A.
Opposite-side cylinder bank
106
B includes opposite-side cylinders
120
B, specifically, the second, fourth, sixth, and eighth cylinders (having even numbers) in opposite-side cylinder bank
106
B. Opposite-side cylinders
120
B extend in a lengthwise direction along opposite-side cylinder bank
106
A.
One-side cylinder center line CA passes through the center of one-side cylinders
120
A. Opposite-side cylinder center line CB passes through the center of opposite-side cylinders
120
B.
One-side cylinder center line CA is set at a one-side angle &thgr;
1
from engine center line EC. Opposite-side cylinder center line CB is set at an opposite-side angle &thgr;
2
from engine center line EC. Engine center line EC passes through a center O of crank shaft
116
. An including angle &agr; (for example 60°) exists between engine center line EC and respective one-side and opposite-side center lines CA, CB. Including angle &agr; is equally divided between a one-side angle &thgr;
1
and an opposite-side angle &thgr;
2
on respective sides of engine center line EC.
During assembly of V-type engine
102
, an upper surface of crank case
112
mounts to a lower surface of V-shaped cylinder block
104
. Oil pan
118
is then mounted on a lower surface of crank case
112
by an attachment fitting (not shown). V-shaped cylinder block
104
, in cooperation with bearing caps
114
, rotatably supports crank shaft
116
in a forward and a rearward direction along V-type engine
102
.
During further assembly, respective one-side and opposite-side cylinder heads
108
A,
108
B are placed on the upper surfaces of each respective one-side and opposite-side cylinder banks
106
A,
106
B.
In bearing construction member
110
, a plurality of lower mounting bolts
122
, extending through bearing caps
114
, mount crank case
112
on the lower surface of V-shaped cylinder block
104
. Lower mounting bolts
122
integrally hold bearing caps
114
and crank case
112
to V-shaped cylinder block
104
. A side mounting bolt
124
integrally holds each respective bearing cap
114
from the side of bearing construction member
110
.
A main oil path
156
is in the side wall of V-shaped cylinder block
104
in a lengthwise direction. During operation, oil circulates through main oil path
156
to cool and lubricate V-type engine
102
.
Referring now to
FIG. 9
, a first to a fifth crank journal, sequentially
126
-
1
, -
2
, -
3
, -
4
, and -
5
are formed on crank shaft
116
and spaced a predetermined distance from each other. A first to an eighth crank pin, sequentially
128
-
1
, . . . -
8
, are also formed on crank shaft
116
, in positions corresponding to respective cylinders, as will be explained.
Since V-type engine
102
is an eight-cylinder engine, first through eighth crank pins
128
-
1
to -
8
are numbered #
1
to #
8
respectively for each respective cylinder.
A pair of first crank weights
130
-
1
A,
130
-
1
B are on either side of first crank pin
128
-
1
. A second crank weight
130
-
2
is between third crank pin
128
-
3
and fourth crank pin
128
-
4
. A third crank weight
130
-
3
is between fifth crank pin
128
-
5
and sixth crank pin
128
-
6
. A pair of fourth crank weights
130
-
4
A,
130
-
4
B are on either side of eighth crank pin
128
-
8
.
A first and a second crank arm
132
-
1
,
132
-
2
, are on either side of second crank journal
126
-
2
. A third and a fourth crank arm
132
-
3
,
132
-
4
, are on either side of third crank journal
126
-
3
. A fifth and a sixth crank arm
132
-
5
and
132
-
6
are on either side of fourth crank journal
126
-
4
.
A pulley mounting projection
134
is on an end of crank shaft
116
adjacent first crank journal
126
-
1
. A starter motor gear
136
on the other end of crank shaft
116
adjacent fifth crank journal
126
-
5
.
A plurality of semicircular block side shaft holes
138
extend through the lower surface of cylinder block
104
. Shaft holes
138
correspond to respective crank journal
126
-
1
to -
5
(shown later) on crank shaft
116
. In contrast to shaft holes
138
, bearing caps
114
each have case side bearing portions
142
. Bearing portions
142
each have respective semicircular case side shaft holes
140
corresponding to respective crank journals
126
on crank shaft
116
. In operation, crank shaft
116
rotates clockwise in rotation direction R.
Referring now to
FIGS. 10
to
14
, crank weights
130
-
1
to
130
-
4
extend away from the moving center of crank shaft
16
(as shown), and aid in force-balancing V-type engine
102
during operation.
Referring now to
FIGS. 15 and 16
, bearing metals
144
rotatably support crank shaft
116
between respective block side shaft holes
138
(of cylinder block
104
) and case side shaft holes
140
(of bearing caps
114
).
A plurality of one-side connecting rods
146
A (numbered -
1
through -
8
) and opposite-side connecting rods
146
B (numbered -
1
through -
8
) join to crank shaft
116
and operate in respective one- and opposite-side cylinder banks
106
A,
106
B, as will be explained. For convenience, member specific to the fourth cylinder in V-type engine
102
are shown. (i.e.
146
B-
4
,
120
B-
4
, CB-
4
etc.) Each one-side and each opposite-side connecting rod
146
A-
1
to -
8
and
146
B-
1
to -
8
has a large

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