The present disclosure relates to an oil management system and more particularly to an integrated oil system.
Engine oil management systems are typically either a wet-sump or dry-sump arrangements. In a dry-sump system, the oil is contained in a separate tank, and circulated through the engine by pumps. In a wet-sump system, the oil is located in a sump, which is an integral part of the engine.
A main component of a wet-sump system is an oil pump, which draws oil from the sump and routes it to the engine. After the oil passes through the engine, it returns to the sump. An oil pump also supplies oil pressure in a dry-sump system, but the source of the oil is a separate oil tank, located external to the engine. After oil is routed through the engine, it is pumped from the various locations in the engine back to the oil tank by scavenge pumps. Dry sump systems allow for a greater volume of oil to be supplied to the engine, which are suitable for engines such as an aircraft in a pusher configuration.
Various features will become apparent to those skilled in the art from the following detailed description of the disclosed non-limiting embodiment. The drawings that accompany the detailed description can be briefly described as follows:
With reference to
An intake port 26 communicates ambient air to the compression section 22 and an exhaust port 28 communicates exhaust products therefrom. A first transfer duct 30 and a second transfer duct 32 communicate between the compression section 22 and the power section 24 such that the exhaust of the power section 24 may be returned to the compression section 22 to provide power recovery and increasing efficiency which provides a cycle within what is referred to herein as a compound rotary engine of the Wankel-type that operates with a heavy fuel such as JP-8, JP-4, diesel or other.
A single shaft 38 which rotates about the axis of rotation A includes aligned eccentric cams 40, 42 which drive a respective first rotor 44 and second rotor 46 which are driven in a coordinated manner by the shaft 38. The first rotor 44 and second rotor 46 are respectively rotatable in volumes 48, 50 formed by a stationary first rotor housing 52 and a stationary second rotor housing 54. The surfaces of the volumes 48, 50 in planes normal to the axis of rotation A are substantially those of a two-lobed epitrochoid while the surfaces of the rotors 44, 46 in the same planes are generally a Reuleaux triangle which mates with the inner envelope of the two-lobed epitrochoid.
A fuel system 36 includes fuel injectors 36A, 36B in communication with the second rotor volume 50 generally opposite the side thereof where the transfer ducts 30, 32 are situated in one non-limiting embodiment. The fuel system 36 supplies fuel into the second rotor volume 50. The first rotor volume 48 in one non-limiting embodiment provides a greater volume than the second rotor volume 50. The first rotor housing 52 and the second rotor housing 54 may be formed in an independent or integral manner to define an engine housing assembly 56 with various fin type and other cooling features (
In operation, air enters the engine 14 through the intake port 26. The first rotor 44 provides a first phase of compression and the first transfer duct 30 communicates the compressed air from the first rotor volume 48 to the second rotor volume 50. The second rotor 46 provides a second phase of compression, combustion and a first phase of expansion, then the second transfer duct 32 communicates the exhaust gases from the second rotor volume 50 to the first rotor volume 48. The first rotor 44 provides a second phase of expansion to the exhaust gases, and the expanded exhaust gases are expelled though the exhaust port 28. As each rotor face completes a cycle every revolution and there are two rotors with a total of six faces, the engine produces significant power within a relatively small displacement.
With reference to
With reference to
The oil reservoir 76 receives oil from an oil circuit 82 (illustrated schematically) to provide a thermal transfer exchange with the coolant flow circuit 80. The oil circuit 82 may be used to cool various engine components, for example, bearing elements. The oil reservoir receives oil from the oil circuit 82 through an oil inlet 84 in communication with the oil filter 78 which is located above an oil discharge 86. The oil reservoir 76 in the disclosed non-limiting embodiment may be considered a dry sump system with the oil pump 70 and a secondary external oil reservoir (not shown) such that oil passage through the oil reservoir 76 facilitates separation or dearation of any entrained gases from the oil before reuse.
With reference to
With reference to
It should be understood that relative positional terms such as “forward,” “aft,” “upper,” “lower,” “above,” “below,” and the like are with reference to the normal operational attitude of the vehicle and should not be considered otherwise limiting.
It should be understood that like reference numerals identify corresponding or similar elements throughout the several drawings. It should also be understood that although a particular component arrangement is disclosed in the illustrated embodiment, other arrangements will benefit herefrom.
Although particular step sequences are shown, described, and claimed, it should be understood that steps may be performed in any order, separated or combined unless otherwise indicated and will still benefit from the present disclosure.
The foregoing description is exemplary rather than defined by the limitations within. Various non-limiting embodiments are disclosed herein, however, one of ordinary skill in the art would recognize that various modifications and variations in light of the above teachings will fall within the scope of the appended claims. It is therefore to be understood that within the scope of the appended claims, the disclosure may be practiced other than as specifically described. For that reason the appended claims should be studied to determine true scope and content.
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