Oil pump of an internal combustion engine

Abstract

This utility model relates to the automotive industry, specifically to internal combustion engine (ICE) lubrication systems, specifically oil pump designs. The technical problem addressed by this utility model is the creation of an internal combustion engine oil pump that eliminates oil foaming (aeration) and improves oil pressure stability in the engine's lubrication system. The technical result is the elimination of oil foaming (aeration) and improved oil pressure stability in the engine's lubrication system.The technical result is achieved by an internal combustion engine oil pump comprising a housing assembled by means of threaded elements, in which a rotating driving element and a driven element, freely rotating within the housing, are mounted, formed in the form of rotors, a receiving pipe with a discharge and suction cavity, on the receiving portion of which an oil supply opening is formed, a bypass valve, a drain opening, and an inlet opening providing for the intake of oil from the discharge cavity. A novel feature is that the bypass valve is located in the receiving pipe, while the drain and inlet openings are formed in the receiving pipe. 2 fig.

Description

[0001] The utility model relates to the automotive industry, in particular to lubrication systems of an internal combustion engine (hereinafter ICE), namely to the design of oil pumps.

[0002] An oil pump is known, comprising a housing assembled by means of threaded elements with a cover having a threaded hole for connecting a fitting, and with a branch pipe having a nozzle with a filter, gears located in the housing, mounted on shafts, one of which is a drive shaft, and an adapter sleeve rigidly fixed in the housing and serving as a support for one of the shafts, wherein the assembled parts of the housing are made shaped, having internal cavities, in one of which a protrusion is made with a pressure-reducing valve installed therein, a metal gasket having openings is fixed in the housing, the second part of the housing, in which the pressure-reducing valve is installed, is connected by an opening with a branch pipe having a conical section narrowing in the direction of movement of the oil flow (see patent for invention RU 2166147, published 04 / 27 / 2001, IPC F16N 13 / 20).

[0003] This pump has some disadvantages - a complex design, high metal consumption and insufficient reliability in operation due to the possibility of jamming of the pressure reducing valve, high hydraulic resistance when pumping oil.

[0004] The closest design to the claimed utility model in terms of its totality of features is one containing a housing assembled by means of threaded elements, in which a rotating leading element is installed, a driven element rotating freely in the housing, the leading and driven elements are made of metal-ceramics in the form of rotors, a receiving pipe with a discharge and suction cavity, on the receiving part of which an opening for supplying oil is made and a filter element in the form of a mesh is fixed, a bypass valve, a drain hole, an inlet hole providing for the intake of oil from the discharge cavity, (see patent for utility model RU 173049 published 01.12.2016 IPC F16N 13 / 20)

[0005] Although this pump achieves the possibility of an optimal design of an oil pump with minimal hydraulic losses, high performance due to the use of a rotor pair instead of gears, there are reasons that prevent the achievement of the technical result specified below when using a known device taken as a prototype, namely: due to the location of the bypass valve in the oil pump body, when excess oil pressure is released by the bypass valve, foam is formed in the engine oil sump, which is then sucked in by the oil pump, due to which the oil pressure becomes unstable, and surges in oil pressure are recorded in the engine lubrication system.

[0006] The technical problem that the utility model is aimed at solving is to create an oil pump for an internal combustion engine with stable oil pressure in the engine lubrication system and to prevent the formation of foam in the oil.

[0007] Technical result - elimination of foaming (aeration) of oil, increasing the stability of oil pressure in the engine lubrication system.

[0008] The technical result is achieved due to the fact that the oil pump of an internal combustion engine, comprising a housing assembled by means of threaded elements, in which a rotating leading element and a driven element are installed, freely rotating in the housing, made in the form of rotors, a receiving pipe with a discharge and suction cavity, on the receiving part of which an oil supply hole is made, a bypass valve, a drain hole, an inlet hole providing for the intake of oil from the discharge cavity, according to the utility model, the bypass valve is located in the receiving pipe, wherein the drain and inlet holes are made in the receiving pipe.

[0009] To explain the essence of the utility model, the following figures are provided:

[0010] Fig. 1 shows a general view of the oil pump of an internal combustion engine with a partial section;

[0011] Fig. 2 shows a general view of the inlet pipe of the oil pump of an internal combustion engine with a partial section.

[0012] The oil pump of an internal combustion engine comprises a housing 2 assembled by means of threaded elements 1, in which a rotating driving element 3 is installed, a driven element 4, freely rotating in the housing, made in the form of rotors. The pump comprises an inlet pipe 5 with a discharge 6 and suction 7 cavity, on the inlet part of which an opening 8 for oil supply is made and a filter element 9 in the form of a mesh is fixed. The pump has a bypass valve 10, a drain hole 11, an inlet hole 12, providing for the intake of oil from the discharge cavity. A new feature is that the bypass valve is located in the inlet pipe, while the drain and inlet holes 7, 8 are formed in the inlet pipe.

[0013] Special case of implementation: by placing a bypass valve in the intake pipe, it was experimentally established that the discharge of oil by the bypass valve within the oil level in the engine crankcase not only stops the formation of foam (oil aeration), but also stabilizes the oil pressure in the engine lubrication system, since the oil is captured without air bubbles.

[0014] The pump operates as follows.

[0015] The oil pump is installed in a liquid medium (oil), while placing the inlet pipe 5 with the filter element 9 in such a way that the suction cavity 7 is covered with a layer of liquid (the required oil level for engine operation, established by the engine manufacturer). When the leading rotor 3 rotates, the driven rotor 4 in the housing 2 of the oil pump also rotates simultaneously. Oil from the engine crankcase (not shown) through the filter element 9 through the oil supply hole 8 in the inlet pipe 5 of the oil pump enters the suction cavity 7, then, when the rotors rotate, the oil is supplied to the discharge cavity 6, and from the discharge cavity 6 through the oil drain pipe in the housing 2 it is supplied to the engine lubrication system.When a certain pressure is reached in discharge chamber 6, the force acting on bypass valve 10 may exceed the force with which the calibrated compression spring presses bypass valve 10 against inlet port 12. The calibrated compression spring then moves, allowing oil to flow through port 11 into the engine's oil sump. This reduces the pressure in discharge chamber 6, stabilizing the oil pressure in the engine's lubrication system. The actuation pressure of bypass valve 10 is determined by the characteristics of the calibrated compression spring.

[0016] The advantage of the claimed utility model is that the design of the internal combustion engine oil pump in the manner described above eliminates foaming (aeration) of the oil, increases the stability of the oil pressure in the engine lubrication system for an oil pump with leading and driven elements made in the form of rotors.

[0017] The industrial applicability is obvious. The applicant's prototype has demonstrated the achievement of the stated technical result.

Claims

An oil pump for an internal combustion engine, comprising a housing assembled by means of threaded elements, in which a rotating driving element and a driven element, freely rotating in the housing, are installed, made in the form of rotors, a receiving branch pipe with a discharge and suction cavity, on the receiving part of which an opening for supplying oil is made, a bypass valve, a drain hole, an inlet hole ensuring the intake of oil from the discharge cavity, characterized in that the bypass valve is located in the receiving branch pipe, wherein the drain and inlet holes are made in the receiving branch pipe.

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