US 10,774,646 B2Granted

Rotary engine with oil pump

AssigneeLG Electronics Inc.

InventorsYunhi Lee, Byeonghun Yu, Byeongchul Lee

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Abstract

A rotary engine having a crankshaft, a housing provided with lobe accommodating portions arranged to surround the crankshaft, and combustion chambers communicating with the lobe accommodating portions, a rotor rotatable eccentrically with respect to the crankshaft and provided with lobes continuously accommodated in the lobe accommodating portions, a housing cover provided with a bearing portion through which the crankshaft is inserted so as to be rotatably supported, and a lubricating unit to supply oil to the bearing portion, wherein the lubricating unit includes an oil pan to accommodate oil therein, an oil pump to pump up oil filled in the oil pan, and an oil supply passage having both ends located in the oil pump and the bearing portion, respectively, is provided. This structure may allow direct and effective lubrication of the bearing portion, and can employ a journal bearing.

Claims17

Dependent claims

A rotary engine comprising:

a crankshaft;
a housing including:
N lobe accommodating portions arranged to surround the crankshaft, wherein N is a natural number equal to or greater than 3;
and
N combustion chambers, each combustion chamber communicating with a corresponding one of the lobe accommodating portions;
a rotor eccentrically rotatable with respect to the crankshaft in the lobe accommodating portions, the rotor having N−1 lobes;
a housing cover coupled to the housing so as to overlap the lobe accommodating portions, the housing cover having a bearing portion to rotatably support the crankshaft;
and
a lubricating system to supply oil to the bearing portion, the lubricating system including:
an oil pan located in the housing cover to hold oil;
an oil pump located adjacent the housing cover and configured to pump oil from the oil pan;
and
an oil supply passage having a first end connected to the oil pump and a second end adjacent to the bearing portion,
wherein the housing cover includes:
an intake-side cover having a plurality of intake holes on one surface of the intake-side cover coupled to the housing, the oil pump being mounted on another surface of the intake-side cover;
and
an oil storage cover coupled to the intake-side cover to accommodate the oil pump, the oil storage cover having a bottom surface defining the oil pan.

14 more elements

A rotary engine comprising:

a crankshaft;
a housing including:
N lobe accommodating portions arranged to surround the crankshaft, wherein N is a natural number equal to or greater than 3;
and
N combustion chambers, each combustion chamber communicating with a corresponding one of the lobe accommodating portions;
a rotor eccentrically rotatable with respect to the crankshaft in the lobe accommodating portions, the rotor having N−1 lobes;
a housing cover coupled to the housing so as to overlap the lobe accommodating portions, the housing cover having a bearing portion to rotatably support the crankshaft;
a rotor gear, the rotor gear having:
a flange portion located between the rotor and the housing cover, the flange portion being fixed to the rotor;
and
a boss portion extending from the flange portion and located between the rotor and the crankshaft, the boss portion having an inner circumferential surface;
an eccentric bearing rotatably supporting the crankshaft, the eccentric bearing being mounted on the inner circumferential surface of the boss portion;
and
a lubricating system to supply oil to the bearing portion and the eccentric bearing, the lubricating system including:
an oil pan located in the housing cover to hold oil;
an oil pump located adjacent the housing cover and configured to pump oil from the oil pan;
and
an oil supply passage having a first end connected to the oil pump and a second end adjacent to the bearing portion and the eccentric bearing.

15 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/942,832Filed 2 Apr 2018
Priority: KR 10-2017-00438914 Apr 2017
Published: US 2018/0283175 A14 Oct 2018
Granted: 15 Sep 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification22 codes

F01C 21/04
Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00: lubrication
F01C 1/22
Rotary-piston machines or engines: of internal-axis type with equidirectional movement of co-operating members at the points of engagement, or…
F01C 11/006
Combinations of two or more machines or engines, each being of rotary-piston or oscillating-piston type: of dissimilar working principle
F01C 13/04
Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby: for driving pumps or compressors