CROSS-REFERENCE TO RELATED APPLICATIONS
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This application claims priority to U.S. Provisional Patent Application No. 61/694,509 filed 29 Aug. 2012, which application is herein expressly incorporated by reference.
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The present teachings generally relate to heat exchangers. The present teachings more particularly relate to a heat exchanger including an in-tank oil cooler with improved heat rejection capability.
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This section provides background information related to the present disclosure which is not necessarily prior art.
Various heat exchangers are used to transfer thermal energy from one medium to another for the purpose of cooling or heating. In this regard, it is necessary to cool various components of a motor vehicle to avoid overheating. As one example, a heat exchanger in the form of a cooling radiator is used to cool an internal combustion engine.
Radiators are conventionally used in motor vehicles for the cooling of internal combustion engines. An exemplary cooling radiator for a motor vehicle is illustrated in FIGS. 1 and 2 and generally identified at reference character 1. The radiator 1 is generally illustrated to generally include a core. The core includes a pair of headers 2 and a plurality of tubes 3 extending between the headers 2. The tubes 3 are inserted into the headers 2 and brazed to the headers 2 to prevent leakage. Coolant circulates through the plurality of tubes 3. Plastic tanks 4 are mounted to the headers 2. As illustrated, an edge 5 of the headers 2 may be rolled over a flange 6 of the tanks 4 for securing the tanks 4 to the headers 2. A gasket 8 may be placed between the headers 2 and the associated tank 4 to prevent leakage.
Coolant may be circulated through the plurality of tubes 3. As the tubes 3 are exposed to the atmosphere, heat may be released from the coolant in this manner. Cooling fins (not shown) may be located between the radiator tubes 3. The fins may increase the total heat exchange area between the radiator 1 and the atmosphere.
As further illustrated, a transmission oil cooler 9 may be conventionally placed inside one of the radiator tanks 4. The transmission oil cooler 9 may include a plurality of plates or tubes 10 for circulating hot transmission fluid between an oil inlet tank 11 having an oil inlet 11 A and an oil outlet tank 12 having an oil outlet 12A. The transmission oil cooler 9 is immersed in the coolant that fills the radiator tank 4. The oil is cooled because even though the coolant is also hot, its temperature is significantly lower than the oil temperature. The temperature differential is used to transfer heat from the oil to the coolant, and ultimately to the atmosphere.
FIG. 3 illustrates the flow of coolant from one of the radiator tubes 3 and across convolutes of the oil cooler plates of the core of the oil cooler 9. As shown, the flow of coolant across the plates of the core of the oil cooler 9 produces a generally laminar flow.
While known heat exchangers have proven to be generally acceptable for their intended purpose, a continuous need for improvement remains in the relevant art.
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This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features.
In accordance with one particular aspect, the present teachings provide a heat exchanger for an internal combustion engine of a motor vehicle includes first and second radiator tanks, a radiator core and an oil cooler disposed in the second radiator tank. The radiator core includes first and second headers associated with the first and second radiator tanks, respectively. The radiator core further includes a plurality of radiator tubes extending between the first and second headers. Each tube is secured to the headers of both the first and second radiator tanks and provides fluid communication from the first radiator tank to the second radiator tank. The plurality of radiator tubes are oriented generally perpendicular to the headers such that a coolant passing through the radiator tubes enters the second radiator tank in a direction generally perpendicular to the header. The oil cooler includes first and second end tanks and a core defined by a plurality of convoluted oil cooler plates. The oil cooler plates extend between the first and second oil cooler tanks and providing fluid communication between the first and second oil cooler tanks. The convoluted oil cooler plates define coolant paths extending through the core. The coolant paths are disposed at an angle relative to the direction the coolant enters the second radiator tank such that coolant is impinged upon walls of the convoluted oil cooler plates.
In accordance with another particular aspect, the present teachings provide an oil cooler including a core and first and second end tanks. The oil cooler core includes a plurality of oil cooler plates. Adjacent oil cooler plates each cooperate to define a fluid path extending in a first direction. The first end tank is located at a first end of the oil cooler core. The second end tank is located at a second end of the oil cooler core, the second end being opposite the first end in a second direction. The oil cooler core receives coolant from a third direction. The third direction is angled relative to the second direction.
Further areas of applicability will become apparent from the description provided herein. The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.
BRIEF DESCRIPTION OF THE DRAWINGS
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The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.
FIG. 1 is a sectional view of a cooling radiator in accordance with the prior art.
FIG. 2 is another sectional view of the prior art cooling radiator of FIG. 1.
FIG. 3 is a prior art view illustrating conventional flow of coolant over oil cooler convolutes.
FIG. 4 is a side view of a heat exchanger in accordance with the present teachings.
FIG. 5 is a simplified cross-sectional view of the heat exchanger of FIG. 6.
FIG. 6 is a view similar to FIG. 3, illustrating flow of coolant over the oil cooler convolutes in the heat exchanger of the present teachings.
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OF VARIOUS ASPECTS
Example embodiments will now be described more fully with reference to the accompanying drawings.
Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.
The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms “a,” “an,” and “the” may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprises,” “comprising,” “including,” and “having,” are inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless specifically identified as an order of performance. It is also to be understood that additional or alternative steps may be employed.
When an element or layer is referred to as being “on,” “engaged to,” “connected to,” or “coupled to” another element or layer, it may be directly on, engaged, connected or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being “directly on,” “directly engaged to,” “directly connected to,” or “directly coupled to” another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.