Patent Application
20180216507
The invention relates generally to engine positive crankcase ventilation (PCV) systems and methods for recycling blow-by gases through a PCV valve into the engine's intake manifold, and more particularly in one exemplary embodiment, to systems and methods including an adapter to replace an oil fill cap and to provide a pathway for blow-by gases to travel from the crankcase to the intake side of an oil and air separator system for removal of crankcase oil from such blow-by gases.
In a combustion engine, blow-by gases typically include unburned gasoline. That is, an amount of air and unburned gasoline from the engine cylinder is pulled past the piston rings and into the crankcase. Instead of exhausting such blow-by gases to the atmosphere, a positive crankcase ventilation (PCV) system recycles the blow-by gases through a PCV valve into the engine's intake manifold. Such recycling occurs when the engine is operating at relatively slow speeds (e.g. idling), i.e., when the air pressure in the crankcase is higher than the air pressure in the intake manifold.
One problem associated with PCV systems and their use involves oil vapors. An engine's crankcase is used to store oil. A pan located below the crankshaft holds oil, and generally oil vapors from the oil in the pan may find their way into the blow-by gases.
It is undesirable for oil to be recycled with blow-by gases into an engine's intake manifold. Such oil may degrade engine performance by lowering the overall octane of the combustion mixture in a cylinder. Such oil also may coat the air intake and prevent airflow.
To combat the presence of oil in blow-by gases, oil and air separators were developed to remove the oil from the blow-by gases before recirculation into the intake manifold. There are various different models or types of oil and air separators available. With all such systems, the intake side of the oil and air separator is connected to a vent or evacuation tube for the crankcase.
This approach to oil and air separation is not without its drawbacks, however. It would prove advantageous to eliminate the need for a separate vent or evacuation tube by using the engine oil fill port to exhaust blow-by gases from the crankcase.
The present disclosure provides an adapter for the intake side of an oil and air separation system. In one exemplary embodiment, the adapter includes a first end portion capable of replacing an engine oil fill cap. The first end portion is connected to an intermediate portion that removably engages with a second end portion including a hose coupling that allows the adapter to be connected to the intake side of an oil and air separation system via a hose.
Other benefits and advantages of the present disclosure will be appreciated from the following detailed description.
Embodiments of the invention and various alternatives are described. Those skilled in the art will recognize, given the teachings herein, that numerous alternatives and equivalents exist which do not depart from the invention. It is therefore intended that the invention not be limited by the description set forth herein or below.
One or more specific embodiments of the system and method will be described below. These described embodiments are only exemplary of the present disclosure. Additionally, in an effort to provide a concise description of these exemplary embodiments, all features of an actual implementation may not be described in the specification. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another. Moreover, it should be appreciated that such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.
Further, for clarity and convenience only, and without limitation, the disclosure (including the drawings) sets forth exemplary representations of only certain aspects of events and/or circumstances related to this disclosure. Those skilled in the art will recognize, given the teachings herein, additional such aspects, events and/or circumstances related to this disclosure, e.g., additional elements of the devices described; events occurring related to oil and air separation and adapter use; etc. Such aspects related to this disclosure do not depart from the invention, and it is therefore intended that the invention not be limited by the certain aspects set forth of the events and circumstances related to this disclosure.
Turning now to the drawings, the figures show an exemplary embodiment of an adapter 10 for use between an engine oil fill port and an oil and air separation can. A first end portion 20 includes a threaded portion 30, so that the first end portion 20 may releasably engage an engine oil fill port in place of an engine oil fill cap. The first end portion 20 may include a generally centrally disposed lumen 40 therethrough. The sidewall 50 of the lumen 40 may be threaded at least in part, so that a male-threaded portion 60 of the intermediate portion 70 of adapter 10 may threadingly releasably engage with the female-threaded portion of the sidewall 50 of lumen 40. An o-ring 35 or gasket may be positioned about first end portion 20 to help seal the engagement of first end portion 20 to the engine oil fill port and help prevent the escape of blow-by gases.
The intermediate portion 70 may be generally cylindrical in shape, and include a generally centrally disposed passageway 80 therethrough. Opposite the male-threaded portion 60 may be a barrel-like portion 90. Disposed between the opposite ends of intermediate portion 70 may be a shoulder 100.
The barrel-like portion 90 and shoulder 100 may be sized for insertion at least in part into a receiving lumen 110 disposed at least in a portion of second end portion 120 of adapter 10. One or more o-rings 130 may be used to help prevent fluid passage between the barrel-like portion 90 and the second end portion 120.
Upon insertion of the barrel-like portion 90 and shoulder 100 into receiving lumen 110, a button 140 may be engaged by the shoulder 100 to releasably hold the barrel-like portion 90 and shoulder 100 in place as inserted into the receiving lumen 110. Depressing and holding the button 140 disengages the button 140 from the shoulder 100 and allows the shoulder 100 and barrel-like portion 90 to be removed from receiving lumen 110. A removable clip also may be used as an alternative to the button 140 to releasably hold the barrel-like portion 90 and shoulder 100 within receiving lumen 110.
At the end of the second end portion 120 of adapter 10 opposite the receiving lumen 110 may be disposed a hose coupling 150. As shown in the drawings, the hose coupling 150 includes a barbed portion that may be inserted into the end of a hose connected to the intake side of an oil and air separation can. Other forms of hose couplings also may be used. An o-ring 155 may be used to help prevent fluid passage between the hose and hose coupling 150. An opening 160 through the hose coupling 150 is in fluid communication with the receiving lumen 110. Thus, upon assembly and installation of the adapter 10, a continuous fluid pathway is formed for blow-by gases between an engine crankcase and an oil and air separation can.
In accordance with the description herein, a robust adapter assembly is provided. The first end portion 20 is adapted to fit an engine oil fill port, which often is a standard size across numerous different models of automobiles. The first end portion 20 may be connected to an intermediate portion 70 and second end portion 120 of a desired size and shape, with a desired-size fluid passageway therethrough and desired size hose coupling 150. Such adaptability is advantageous since fluid passageway and hose coupling sizes often may vary across various automobiles.
In accordance with the description herein, to add oil to an engine with an adapter 10 installed, one need only disconnect the intermediate portion 70 and second end portion 120 (i.e., by depressing the button 140 and pulling the parts apart), and then remove the first end portion 20 in much the same way that an engine oil fill cap is removed. Separating the parts in this way also may prove advantageous when replacing or when emptying an oil and air separator.
It should be understood that the foregoing description is only illustrative of the invention. Various alternatives and modifications can be devised by those skilled in the art having the benefit of this disclosure, without departing from the invention. Accordingly, the invention is intended to embrace all such alternatives, modifications and variances.
Certain exemplary embodiments of the disclosure may be described. Of course, the embodiments may be modified in form and content, and are not exhaustive, i.e., additional aspects of the disclosure, as well as additional embodiments, will be understood and may be set forth in view of the description herein. Further, while the invention may be susceptible to various modifications and alternative forms, specific embodiments have been shown by way of example in the drawings and will be described in detail herein. However, it should be understood that the invention is not intended to be limited to the particular forms disclosed. Rather, the invention is to cover all modifications, equivalents and alternatives falling within the spirit and scope of the invention.
