Heat exchange – With vehicle feature
Reexamination Certificate
2002-03-14
2004-11-09
Bennett, Henry (Department: 3743)
Heat exchange
With vehicle feature
C165S167000, C165S916000, C123S1960AB, C123S1960CP
Reexamination Certificate
active
06814133
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a heat exchanger (oil cooler) for cooling oil with water and particularly to a so-called housing-less type oil cooler formed by stacking plate members together.
Japanese Patent Unexamined Publication JP-A-7-286786 discloses such housing-less type heat exchanger (oil cooler), as shown in
FIGS. 6-8
of the present application. As shown in
FIG. 6
, this heat exchanger has a core portion
51
. This core portion
51
is reinforced with upper and lower reinforcing plates
53
,
55
(made of aluminum). The upper reinforcing plate
53
is covered with a cover member
57
, and a void space
59
is provided between the cover member
57
and the upper reinforcing member
53
. A collar member
63
is disposed at a central portion of the core portion
51
for receiving an attaching bolt
61
therethrough. An attaching member
65
is disposed under the lower reinforcing plate
55
for attaching the heat exchanger to an automatic transmission. As shown in
FIG. 7
, each of the upper reinforcing plate
53
and the cover member
57
is provided with through holes for receiving therethrough a cooling water inlet pipe
67
and a cooling water outlet pipe
69
. The core portion
51
is formed of first and second plates
71
and
73
(made of aluminum having thereon a cladding of a brazing material) alternately stacked together such that cooling water chambers
75
and oil chambers
77
are alternately formed between these plates
71
,
73
. As shown in
FIG. 6
, adjacent oil chambers
77
are communicated with each other through a pair of oil passages
79
a
and
79
b
, which are symmetrically arranged about the collar member
63
disposed at the central portion. Furthermore, inner fins
81
are received in the oil chambers
77
. In contrast, as shown in
FIG. 7
, adjacent water chambers
75
are communicated with each other through a pair of cooling water passages
83
, which are symmetrically arranged about the collar member
63
. The oil passages
79
a
and
79
b
are partly blocked by blocking plates
71
A,
73
A. As shown in
FIG. 6
, an oil inlet pipe
85
is inserted deep in the core portion
51
by passing it from a first side (the side of the cover member
57
) through the cover member
57
, the upper reinforcing plate
53
, the
9
oil passage
79
a
and the blocking plates
71
A and
73
A. The oil inlet pipe
85
is formed with upper and lower projections
85
a
and
85
b
. The upper projection
85
a
is brazed to the cover member
57
to sealingly close the through hole of the cover member
57
. The lower projection
85
b
is sealingly brazed to the blocking plate
71
A. The oil inlet pipe
85
has a diameter that is substantially smaller than that of the oil passage
79
a
, except at the position of the blocking plates
71
A and
73
A, such that an annular space is provided between the oil inlet pipe
85
and the outer periphery of the oil passage
79
a
. The oil is allowed to flow through the annular space as shown by the arrows of FIG.
6
. An oil outlet pipe
87
is inserted in the core portion
51
by passing it through the cover member
57
and the upper reinforcing plate
53
. The oil outlet pipe
87
is formed with (a) a projection
87
a
sealingly brazed to the cover member
57
and (b) and an end sealingly brazed to the upper reinforcing plate
53
. As shown in
FIG. 6
, the oil is introduced into a lower portion of the core portion
51
from the oil inlet pipe
85
. Then, it is allowed to flow in the core portion
51
in a meandering manner by the provision of the blocking plates
71
A and
73
A, as shown by the arrows of FIG.
6
. After that, it is allowed to flow out of the core portion
51
into the oil outlet pipe
87
. In contrast, as shown in
FIG. 7
, the cooling water is introduced into the core portion
51
from the cooling water inlet pipe
67
. Then, it is allowed to flow through cooling water passages
83
. Each cooling water chamber
75
is filled with the cooling water, thereby conducting a heat exchange between the heated oil and the cooling water. After this heat exchange, the water is allowed to flow into the cooling water outlet pipe
69
from the core portion
51
. As shown in
FIG. 8
, the heat exchanger
99
is attached to an automatic transmission
91
. In fact, this transmission
91
is formed with threaded projections
93
. An attaching base
95
is fixed to the threaded projections
93
by threadedly engaging bolts
97
with the threaded projections
93
. The attaching base
95
is formed at center with a threaded hole
95
a
. The attaching bolt
61
is inserted into the collar member
63
of the core portion
51
and then threadedly engaged with the threaded hole
95
a
, thereby attaching the heat exchanger
99
to the automatic transmission
91
. Furthermore, oil inlet and outlet pipes
101
and
103
of the transmission
91
are respectively connected with the oil inlet and outlet pipes
85
and
87
of the heat exchanger
99
. It is possible to turn the oil flow direction by the provision of the blocking plates
71
A and
73
A. As mentioned above, the oil inlet pipe
85
is inserted deep in the core portion
51
in order to achieve an oil flow in a meandering manner. This makes the heat exchanger's piping structure very complicated.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a heat exchanger that is capable of achieving an oil flow in a meandering manner without inserting a pipe member deep in a core portion of the heat exchanger.
It is another object of the present invention to provide a heat exchanger that is capable of providing a superior heat exchange between oil and cooling water with a relatively small number of parts and a relatively simple construction.
According to the present invention, there is provided a heat exchanger for cooling oil with water, comprising:
a plurality of plates stacked together to form a core portion of said heat exchanger such that a plurality of oil chambers for receiving the oil and a plurality of water chambers for receiving the water are alternately formed between said plates, said water chambers being communicated with each other through first and second water passages;
a first wall portion for defining a through hole in said core portion, said through hole allowing the oil to flow therethrough and having first and second ends at first and second sides of said core portion respectively, said first end being one of an inlet for allowing the oil to flow into said core portion and an outlet for allowing the oil to flow out of said core portion;
a second wall portion for defining a first oil passage in said core portion, said first oil passage extending between said first and second sides of said core portion to communicate with said oil chambers, said first oil passage having first and second ends at said first and second sides of said core portion respectively, said first end of said first oil passage being the other of said inlet and said outlet;
a third wall portion for defining a second oil passage in said core portion, said second oil passage extending between said first and second sides of said core portion to communicate with said oil chambers; said second oil passage having first and second ends at said first and second sides of said core portion respectively,
a first blocking plate for blocking a part of said first and second oil passages such that a flow of the oil is turned from one of said first and second oil passages to the other of said first and second oil passages; and
a first cover member for sealingly covering said second side of said core portion, said first cover member having an oil passage extending between said second end of said through hole and at least one of said second end of said first oil passage and said second end of said second oil passage.
REFERENCES:
patent: 4011905 (1977-03-01), Millard
patent: 5464056 (1995-11-01), Tajima et al.
patent: 5511612 (1996-04-01), Tajima et al.
patent: 5513702 (1996-05-01), Tajima et al.
patent: 5544699 (1996-08-01), Robers et al.
pa
Bennett Henry
Calsonic Kansei Corporation
Foley & Lardner LLP
Patel Nihir
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