JP2015101973A - Engine oil circulation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable oil remaining in an engine main body to be returned to an engine oil pan without particularly providing a plurality of pumps, and to ensure circulation of engine oil without increasing specified value of a quantity of oil and the like.SOLUTION: An engine oil circulation device for vacuuming oil OL remaining in an oil pan 4 by an oil pump 7 and supplying the oil OL to respective lubrication sections of an engine main body 1, comprises a scavenging pump 20 that includes a plurality of inlets (a first inlet 21, a second inlet 22, and a third inlet 23) independently communicating with a plurality of independent working-fluid storage sections (an oil catch tank 12, a second storage section 14 of a left cylinder head 3L, and a third storage section 16 of a right cylinder head 3R), respectively, and that discharges one of working fluids vacuumed from the inlets 21, 22, and 23 from one discharge port 24.

Description

  The present invention relates to an engine oil circulation device that reliably circulates engine oil to each lubricating portion.

  Conventionally, in an automobile engine, the oil in the engine body and the oil tank is unevenly distributed when the vehicle is traveling on a ramp or turning, and the suction port of the oil intake passage connected to the oil tank is exposed to the air. Then, there is a possibility that the oil is not introduced into the oil circulation pump and the oil circulation operation cannot be smoothly performed. For this reason, for example, in Japanese Patent Application Laid-Open No. 2007-198311 (hereinafter referred to as Patent Document 1), an engine mounted on a vehicle in a state where an oil return passage for guiding oil supplied to a cylinder head to an oil pan intersects the vertical direction. The technology of an oil recovery apparatus for an engine including an oil recovery passage that can guide oil in a cylinder head or an oil return passage and a jet pump that sucks oil in the oil recovery passage is disclosed.

JP 2007-198311 A

  However, the running state of the vehicle varies in the turning direction and the gradient direction. For example, when the vehicle turns left (or travels on a right slope), the engine oil tends to stay on the right bank side of the engine. When turning right (or when traveling on a left slope), the engine oil tends to stay on the left bank side of the engine. In consideration of such various driving conditions of the vehicle, applying the technique disclosed in Patent Document 1 described above and performing smooth lubrication of engine oil are assumed in restricted spaces. A plurality of jet pumps corresponding to the traveling state is required, which causes problems such as cost increase and weight increase.

  The present invention has been made in view of the above circumstances. In particular, without providing a plurality of pumps, the oil staying in the engine body is returned to the oil pan of the engine, and the specified value of the oil amount is not increased, and reliable. An object of the present invention is to provide an engine oil circulation device that enables circulation of engine oil.

  An engine oil circulation device according to an aspect of the present invention is an engine oil circulation device in which oil stored in an oil pan is sucked by an oil pump and supplied to each lubricating portion of the engine body. A scavenging pump having a plurality of suction ports communicating with each other independently and discharging the working fluid sucked from the plurality of suction ports from one discharge port is provided.

  According to the engine oil circulation device of the present invention, the engine staying in the engine body is returned to the engine oil pan without particularly providing a plurality of pumps, and the specified value of the oil amount is not increased. Oil circulation is possible.

1 is a schematic explanatory diagram of an oil lubrication system of a horizontally opposed engine equipped with a turbocharger according to an embodiment of the present invention. It is explanatory drawing of the scavenging pump which concerns on one Embodiment of this invention, FIG.2 (a) is a pump front view, FIG.2 (b) is AA sectional drawing of Fig.2 (a). FIG. 3 is an explanatory view of a scavenging pump different from the scavenging pump of FIG. 2, FIG. 3 (a) is a front view of the pump, and FIG. 3 (b) is an AA sectional view of FIG. 3 (a).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1, reference numeral 1 denotes an engine body of a horizontally opposed engine, 2 denotes a cylinder block of the engine body 1, and this cylinder block 2 is divided into left and right banks 2L and 2R, and a block mating surface 2a of each bank 2L and 2R. The cylinder heads 3L and 3R are fixed to each other.

  An oil pan 4 is disposed on the bottom surface of the engine body 1, and a turbocharger 5, which is an example of a supercharger, is disposed directly below the engine body 1. In the drawing, the turbocharger 5 is shown in a state separated from the engine body 1 for convenience, but the actual turbocharger 5 is below the cylinder head 3R (or 3L), It is disposed near the side surface of the oil pan 4.

  In addition, a crankshaft 6 is provided horizontally on the surface of the cylinder block 2 where the left and right banks 2L and 2R are joined, and an oil pump 7 is connected to the front shaft end of the crankshaft 6. Yes. An oil strainer 9 is communicated with the inlet of the oil pump 7 through a suction oil passage 8. The oil strainer 9 is disposed at the bottom of the oil pan 4 so as to be immersed in the oil OL stored in the oil pan 4.

  The oil sucked by the oil pump 7 is supplied to each lubricating part such as a valve operating mechanism in the cylinder heads 3L, 3R through an oil gallery (not shown) formed in the left and right banks 2L, 2R. The Further, a turbocharger lubricating oil passage 10 is branched and connected to the oil gallery, and an oil inlet of the turbocharger 5 is communicated with the supercharger lubricating oil passage 10.

  Further, a drain oil passage 11 is communicated with the oil outlet of the turbocharger 5, and the drain oil passage 11 is disposed in the lower portion of the turbocharger 5 as an oil catch tank 12 as a first storage part. It is communicated to. The oil that has flowed into the turbocharger 5 from the oil inlet lubricates and cools the lubricated parts such as bearings that support the turbine shaft, and the oil after lubrication and cooling passes through the drain oil passage 11 to catch the oil. It is collected in the tank 12.

  A first suction port 21 of a scavenging pump 20 described later is communicated with the oil catch tank 12 via a first suction oil passage 13.

  The left cylinder head 3 </ b> L is provided with a second oil reservoir 14 and communicates with the second suction port 22 of the scavenging pump 20 via the second suction oil passage 15. Furthermore, the right cylinder head 3 </ b> R is provided with a third oil reservoir 16 and communicates with the third suction port 23 of the scavenging pump 20 via the third suction oil passage 17. Further, the discharge port 24 of the scavenging pump 20 communicates with the drain oil passage 18 to the oil pan 4.

  The scavenging pump 20 is interposed between the front surface of the engine body 1 and the oil pump 7 with the crankshaft 6 as a drive shaft.

  As shown in FIGS. 2A and 2B, the scavenging pump 20 is a well-known internal gear pump represented by a trochoidal pump or the like, and the rotor of the casing 30 in the scavenging pump 20. In the room, an outer rotor 31 and an inner rotor 32 are assembled with their centers being eccentric.

  The outer rotor 31 is formed with an inner tooth portion 31a on the inner periphery, the inner rotor 32 is formed with an outer tooth portion 32a on the outer periphery, and the outer rotor 31 and the inner rotor 32 form a plurality of gap portions 33, and the meshing point Engage with Ps.

  A central hole (opening) 30a communicating with the rotor chamber is formed at the center of the casing 30, and a crankshaft for driving the scavenging pump 20 with an inner rotor 32 attached to the central hole 30a. 6 is inserted. Further, the outer rotor 31 is rotatably incorporated in the rotor chamber of the casing 30.

  In addition, the rotor chamber of the casing 30 includes a first suction port 21, a second suction port 22, and a second suction port on the left side of the center line passing through the crankshaft 6 in FIGS. Three independent suction ports of the three suction ports 23 are formed. As described above, the first suction port 21 is communicated with the oil catch tank 12 via the first suction oil passage 13, and the second suction port The suction port 22 is communicated with the second storage portion 14 via the second suction oil passage 15, and the third suction port 23 is communicated with the third storage portion 16 via the third suction oil passage 17. ing. Further, in the rotor chamber of the casing 30, a discharge port 24 of the scavenging pump 20 is formed on the right side of the center line passing through the crankshaft 6 in FIGS. 18 is communicated.

The operation of the engine oil lubrication system configured as described above will be described.
When the engine is operated, the oil pump 7 and the scavenging pump 20 that are attached to the crankshaft 6 are rotationally driven.

  The oil OL stored in the oil pan 4 by the rotational drive of the oil pump 7 is sucked from the oil strainer 9 through the suction oil passage 8 and passes through the oil gallery formed in the engine body 1 to move the crank chamber and the movement. Oil is sent to the valve chamber and the like to lubricate and cool each lubricated part. The oil OL after lubrication and cooling is returned to the oil pan 4 through the crank chamber.

  A turbocharger lubricating oil passage 10 is branched and connected to the oil gallery, and a part of the oil OL fed from the oil pump 7 to the oil gallery passes through the supercharger lubricating oil passage 10 and is turbocharged. It flows into the machine 5 and lubricates and cools the lubrication required parts such as bearings that support the turbine shaft. The oil OL after lubricating and cooling the lubrication required parts such as the bearings is collected in the oil catch tank 12 through the drain oil passage 11.

  The oil OL collected in the oil catch tank 12 is sucked up to the first suction port 21 via the first suction oil passage 13 by driving the scavenging pump 20.

  Further, the air in the second storage section 14 of the left cylinder head 3L, or the oil or the air mixed oil that stays when the vehicle turns to the right (or travels on the left slope) (symbol SL in FIG. 1). Is sucked up to the second suction port 22 through the second suction oil passage 15 by driving the scavenging pump 20.

  Further, the air in the third storage section 16 of the right cylinder head 3R, or the oil or air mixed oil that has accumulated by turning left (or running on the right ramp) is indicated by the symbol SR in FIG. Is drawn up to the third suction port 23 via the third suction oil passage 17 by driving the scavenging pump 20.

  The working fluid of air, oil, or air mixed oil sucked from the first, second, and third suction ports 21, 22, and 23 of the scavenging pump 20 flows from the discharge port 24 of the scavenging pump 20 to the drain oil passage 18. After that, it is recovered into the oil pan 4.

  As described above, according to the embodiment of the present invention, in the engine oil circulation device that sucks the oil OL stored in the oil pan 4 by the oil pump 7 and supplies the oil OL to each lubrication portion, a plurality of independent devices are provided. A plurality of suction ports (first tanks) communicating independently with the working fluid reservoir (the oil catch tank 12, the second reservoir 14 of the left cylinder head 3L, and the third reservoir 16 of the right cylinder head 3R), respectively. Scavenging pump which has one suction port 21, second suction port 22, and third suction port 23) and discharges working fluid sucked from a plurality of suction ports 21, 22, 23 from one discharge port 24 20 was provided. Thus, the suction path from each reservoir (the oil catch tank 12, the second reservoir 14 of the left cylinder head 3L, and the third reservoir 16 of the right cylinder head 3R) to each of the suction ports 21, 22, 23. Are independently formed, the air mixed oil and the oil are reliably sucked from the other suction ports even if the air is sucked by any of the suction ports. For this reason, without providing a plurality of pumps, the oil staying in each part of the engine body 1 with only one scavenging pump 20 is returned to the oil pan 4 of the engine, without increasing the prescribed value of the oil amount, etc. Reliable engine oil circulation is possible.

  In addition, although the scavenging pump 20 according to the present embodiment has been described as an example having three suction ports 21, 22, and 23, for example, in the case of an engine without the turbocharger 5, two suction ports You may form with the pump (after-mentioned scavenging pump 40) which has only an opening | mouth. Hereinafter, the scavenging pump 40 will be described with reference to FIG. The scavenging pump 40 is different from the scavenging pump 20 only in that it has two suction ports. Therefore, the same components are denoted by the same names and reference numerals, and the description thereof is omitted.

  The scavenging pump 40 is constituted by a trochoid pump, similar to the scavenging pump 20, and in FIG. 3 (a) and FIG. 3 (b), on the left side of the center line passing through the crankshaft 6, there is a second suction port. Two independent suction ports 22 and a third suction port 23 are formed, and the second suction port 22 is connected to the second reservoir 14 of the left cylinder head 3L via the second suction oil passage 15. The third suction port 23 is communicated with the third reservoir 16 of the right cylinder head 3R via the third suction oil passage 17. Further, a discharge port 24 of a scavenging pump 40 is formed in the rotor chamber of the casing 30 on the right side of the center line passing through the crankshaft 6 in FIGS. 3 (a) and 3 (b). 18 is communicated.

  By providing such a scavenging pump 40, oil can be reliably prevented from staying in the left cylinder head 3L and the right cylinder head 3R. Therefore, one scavenging pump can be provided without providing a plurality of pumps. The oil accumulated in each part of the engine main body 1 is returned to the engine oil pan 4 only by 40, and the engine oil can be reliably circulated without increasing the specified value of the oil amount.

  Further, in the embodiment of the present invention, two or three independent suction ports are described as an example of a plurality of independent suction ports, but when a larger number of oil reservoirs is assumed, The scavenging pump may be configured with a plurality of independent suction ports of the assumed number. Furthermore, in the embodiment of the present invention, the scavenging pump 20 is configured such that the crankshaft 6 is interposed between the front surface of the engine body 1 and the oil pump 7 as a pump drive shaft. The position to be provided is not limited to this position. For example, the position to be provided may be provided on a drive shaft driven by an electric motor, or an engine cam shaft may be provided as a drive shaft.

DESCRIPTION OF SYMBOLS 1 Engine body 2 Cylinder block 3L, 3R Cylinder head 4 Oil pan 5 Turbocharger 6 Crankshaft 7 Oil pump 8 Suction oil path 9 Oil strainer 10 Supercharger lubricating oil path 11 Drain oil path 12 Oil catch tank 13 1st Suction oil passage 14 Second storage portion 15 Second suction oil passage 16 Third storage portion 17 Third suction oil passage 18 Drain oil passage 20 Scavenging pump 21 First suction port 22 Second suction port 23 Third suction port 24 Discharge port 30 Casing 31 Outer rotor 32 Inner rotor 33 Gap 40 Scavenging pump

Claims (5)

In the engine oil circulation device, the oil stored in the oil pan is sucked by the oil pump and supplied to each lubricating part of the engine body.
A scavenging pump that has a plurality of suction ports communicating independently with a plurality of independent working fluid reservoirs, and discharges the working fluid sucked from the plurality of suction ports from one discharge port; A featured engine oil circulation device.   2. The engine oil circulation device according to claim 1, wherein the plurality of independent working fluid reservoirs are at least a left cylinder head and a right cylinder head.   3. The engine oil circulation device according to claim 1, wherein the plurality of independent working fluid reservoirs are at least a left cylinder head, a right cylinder head, and an oil catch tank of a supercharger.   The engine oil circulation device according to any one of claims 1 to 3, wherein the working fluid is any one of oil, air, and air mixed oil.   The engine oil circulation device according to any one of claims 1 to 4, wherein the scavenging pump is a trochoid pump.

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