Internal-combustion engines – Cooling – Automatic coolant flow control
Reexamination Certificate
1998-11-25
2001-03-13
McMahon, Marguerite (Department: 3747)
Internal-combustion engines
Cooling
Automatic coolant flow control
C123S1950HC
Reexamination Certificate
active
06199516
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of Invention
The present invention relates to a cooling apparatus for an internal combustion engine, in which a mounting bracket for mounting an internal combustion engine on a vehicle and a thermostat provided in a channel for cooling water are formed in a unit.
2. Background of Related Art
Conventionally, a cooling water for vehicles is adapted to circulate between the internal combustion engine and a radiator to cool a cylinder block and the like in order to keep a temperature of the cylinder block or a cylinder head at a constant one or control the temperature in order to avoid a seizure.
FIG. 13
is a schematic diagram showing the cooling system for a water cooling type internal combustion engine, and
FIG. 14
shows a systematic drawing for this water cooling system. In
FIG. 13
, sign
1
shows an internal combustion engine and sign
2
shows internal combustion engine body.
In the internal combustion engine body
2
, a water cooling channel (not shown) is provided and this water channel is provided with a water pump
3
which is mounted on the front side of the vehicle and driven by a V-belt as well as a cooling fan
3
A. This cooling water channel is composed of basically a main channel and a by-pass channel. In the main channel, the cooling water discharged from the water pump
3
flows from the cylinder block
4
to the cylinder head
5
through a cooling water piping
6
, and from an upper tank (not shown) to the radiator
7
, and from a lower tank (not shown) through a cooling water piping
8
to a thermo-case
9
, and through a cooling water piping
10
, it returns again to the water pump
3
.
Further, the by-pass channel is a channel which circulates to the water pump
3
from the cylinder head
5
without passing through the radiator
7
when the thermostat
11
is closed. The thermostat
11
closes the valve when the temperature of the cooling water is low to stop a flowing of the cooling water to radiator
7
and make the warming time period shorten by circulating the cooling water through the by-pass channel.
In addition, channels such as circulating the cooling water from the cylinder head
5
through a heater core
12
, the thermo-case
9
and the cooling water piping
10
to the water pump
3
, and circulating the cooling water from the cylinder head
5
through a throttle body
13
, the thermo-case
9
and the cooling water piping
10
to the water pump
3
are provided. Now, in
FIG. 13
, the sign
14
represents a water reservoir tank, and sign W and arrows represent flowing directions of the cooling water. In
FIG. 15
, the sign
17
represents an exhaust manifold.
The thermo-case
9
is what installs a thermostat
11
, which is formed with a case body
9
a
and a thermo-cap
9
b
. This thermo-case
9
is mounted on the cylinder head
5
which is disposed at the rear side of a lengthwise-setting internal combustion engine, a crank shaft of which is disposed in parallel with a back-and-forth direction of a vehicle (hereinafter, such engine is referred to as lengthwise-setting internal combustion engine, and an engine in which a crank shaft is disposed normally to the back-and-forth direction horizontally is referred to as crosswise-setting internal combustion engine) and higher than the cylinder block
4
(the schematic diagram of
FIG. 13
is what helps understandings of the circulation of the cooling water, and actually, the thermo-case
9
is mounted on the cylinder head
5
disposed above the cylinder block
4
).
Further,
FIG. 15
shows a cooling apparatus in which the thermo-case
9
is disposed at a substantially intermediate position of the lengthwise-setting internal combustion engine
1
in the back-and-forth direction of the vehicle, and mounted on the cylinder block
4
positioned lower than the cylinder head
5
. Further, a cooling water piping
8
connecting this thermo-case
9
and the lower tank of the radiator
7
is disposed close to the internal combustion engine body
2
. Now, in
FIG. 15
, the identical members in
FIG. 13
are attached with the same signs and their explanations are omitted.
In the conventional prior art explained above, in what is shown in
FIG. 13
, since the thermo-case
9
is mounted on the cylinder head
5
of the internal combustion engine
1
, the mounting position of the thermostat
11
becomes higher, and the thermo-case
9
is mounted at the rear side of the lengthwise-setting internal combustion engine
1
, there arises a problem that the cooling water piping connecting the thermo-case
9
and the lower tank of the radiator becomes longer.
At that state, when the cooling water is filled in the radiator
7
, since the thermo-case
9
is located at a higher position and the thermostat
11
is closed, there arises a problem that, in the cooling water piping
8
, a standing air is apt to be generated. If such a standing air is generated, there arises a problem which causes the cooling water to be reduced and to invite a deterioration of the internal combustion engine (for example, seizure).
Further,
FIG. 15
shows a cooling apparatus in which the thermo-case
9
is disposed on a substantially intermediate position of the lengthwise-setting internal combustion engine
1
in the back-and-forth direction, and mounted on the cylinder block. By this construction, there has been also arisen a problem that the mounting position of the thermo-case
9
becomes high and the cooling water piping
8
which connects the lower tank and of the radiator
7
and the thermo-case
9
becomes long.
Further, there are also problems in which the cylinder block
4
needs a space for mounting the thermo-case
9
or a boss for tightening the thermo-case
9
. In addition, since the cooling water piping
8
is disposed close to the internal combustion engine body
2
, there is a problem that the cooling water pipings
8
and
10
receive the heat of the internal combustion engine body
2
and the cooling efficiency is decreased.
SUMMARY OF THE INVENTION
The present invention is to solve the above conventional problem, and the purpose thereof is to provide a cooling apparatus of an internal combustion engine, in which the thermo-case is mounted in a unit with a mounting bracket of an internal combustion engine, thereby the mounting position of the thermo-case becomes lower to avoid an air standing, the internal combustion engine from being deteriorated when the cooling water is reduced, the length of the cooling water piping between the thermo-case and a radiator, and the length of a cooling water piping between the thermo-case and a water pump are made short, in addition the provision of a mounting space for the thermo-case and a boss for clamping the thermostat on a cylinder block is adapted to be unnecessary and the cooling efficiency is improved.
According to the first feature of the present invention, in a cooling apparatus which is provided with a cooling water circuit connecting a cooling water channel provided in an internal combustion engine body and a radiator to cool the water heated in the internal combustion engine body with a cooling water piping and a water pump for circulating a cooling water in the cooling water circuit, a mounting bracket for mounting the internal combustion engine on a vehicle is provided in the internal combustion engine body and a thermo-case in which a thermostat provided in the cooling water circuit is installed is provided in a unit with the mounting bracket.
Further, according to the second feature of the present invention, in the first feature of the present invention, the thermo-case is mounted on the internal combustion engine in such a manner as an angle which is formed with a center line of the thermostat provided coaxially with the thermo-case and a horizontal axis of the internal combustion engine in the axial direction becomes greater than the angle which is formed with a horizontal axis in the axial direction when the internal combustion engine is mounted on a vehicle and a horizontal axis in the axial direction of the internal combustion engine
Benton Jason
McMahon Marguerite
Nath Gary M.
Nath & Associates
Novick Harold L.
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