DE102009018009A1 - Oil cooling circuit for internal combustion engine, has oil pump and oil cooler, where line is provided for supplying piston cooling unit and another line is provided for supplying bearings - Google Patents

Abstract

The oil cooling circuit has an oil pump (32) and an oil cooler (50). A line (42) is provided for supplying a piston cooling unit (44) and another line (46) is provided for supplying bearings. The oil cooler is arranged in the former line for supplying the piston cooling unit. A thermostat (52) is arranged in the former line. The thermostat adjusts the temperature of the oil according to the cooling requirement of the piston cooling. An independent claim is also included for an internal combustion engine with a barrel cooling.

Description

The The invention relates to an oil cooling circuit of a Internal combustion engine.

From the practice and from the DE 25 46 273 C2 It is known to lubricate bearings in an internal combustion engine by a cooling and lubricating oil and to cool the piston. A to in the DE 25 46 273 C2 provided common oil cooling circuit has an oil pan, an oil pump, an oil cooler, an oil filter, a control element and lines that are designed and interconnected such that in a warm-up phase, the radiator is bypassed and a cooling of the piston is omitted.

An arrangement with two separate cooling circuits for an oil-cooled engine is known from DE 236 38 437 A1 known. In the in the DE 236 38 437 A1 described cooling circuits is a lubricating and spraying oil circuit and a cooling oil circuit, the latter is the outer cooling and provides a path of the oil, which runs without direct contact with the friction surfaces of the engine. In the DE 236 38 437 A1 Thus, the cooling oil circuit replaces conventional water cooling of an internal combustion engine, while the lubricating and spraying oil circuit corresponds to known oil cooling circuits.

The Design of the cooling circuits affects the Operational safety, the efficiency and the exhaust gas behavior of a Internal combustion engine off.

On In the aforementioned background, the invention is based on the object, the operating behavior of an internal combustion engine preferably in terms the operational safety, the efficiency and the exhaust gas behavior to improve.

The Solution of this problem is inventively with the features of claims 1 and 7, respectively.

According to the Invention is in an oil-cooling circuit a Internal combustion engine, with at least one oil pump, at least a first oil cooler, at least a first Line for supplying at least a first piston cooling unit and at least one second line for supplying bearings, provided that the first oil cooler in the first Line arranged to supply the first piston cooling unit is. This allows the piston cooling targeted on the situation matched to the pistons, making them very efficient, and it is possible in particular, a high cooling capacity provide, thereby increasing the reliability becomes. At the same time, the bearing lubrication points with warmer oil be supplied, resulting in the friction of a crank mechanism can be reduced, resulting in an overall improved efficiency an internal combustion engine leads.

According to one particularly preferred embodiment of the invention is provided that in the first line, a thermostat is arranged, preferably exclusively in accordance with the cooling requirements the piston cooling the temperature of the first line to the first piston cooling unit promoted oil established.

According to one Another particularly preferred embodiment of the invention is provided that the thermostat has a control part and a control part, preferably such that, depending on an operating phase an internal combustion engine, a cooling or heating of a Piston is done by the oil. This can be done improve the exhaust gas performance of an internal combustion engine.

According to one Another particularly preferred embodiment of the invention is provided that the first line has at least one branch, so that over this next to the first piston cooling unit further piston cooling units another piston to be supplied with oil. By such Embodiment, the invention is particularly simple in internal combustion engines Can be used with several cylinders.

According to one Another particularly preferred embodiment of the invention is provided that the piston cooling units formed as oil spray nozzles are. This makes it possible to known arrangements to resort to the piston cooling, resulting in the invention can be easily put into practice.

According to one Another particularly preferred embodiment of the invention is provided that the first oil cooler as an oil-water heat exchanger is trained.

The Advantages of the invention are particularly evident in an internal combustion engine, which has a cylinder cooling. Therefore, also for an internal combustion engine, which is a cylinder cooling as well an oil cooling circuit for internal cooling according to the invention claimed protection. With regard to the advantages and modes of action is hereby expressly to the description of the oil cooling circuit according to the invention and its particularly preferred embodiments and directed.

According to one particularly preferred embodiment of the invention is provided that the cylinder cooling is designed as water cooling is, preferably formed in a cylinder wall, a water jacket is.

Farther Is it possible that the first oil cooler and the second oil cooler in a housing are arranged, with a parallel flow advantageous is. It can be one of the two or two oil coolers an oil filter, such as a coarse mesh filter, be upstream or downstream. Alternatively, the oil for Piston cooling conveyed unfiltered to the piston syringes to reduce pressure loss in the oil circuit to reduce the frictional loss.

Further yield advantageous embodiments and refinements of the invention from the subclaims as well as from the description in connection with the drawing.

there shows:

1 a particularly preferred embodiment of an internal combustion engine according to the invention with a particularly preferred embodiment of an oil cooling circuit according to the invention in a schematic representation.

In the 1 in a schematic representation of the internal combustion engine shown 10 is designed as a highly charged reciprocating engine. The internal combustion engine 10 points in an engine block 12 four to six cylinders 14 in which piston 16 are included. In the engine block 12 are especially in the cylinder walls 18 channels 20 trained, a water jacket 22 describe a water cooling system intended for cylinder cooling.

The internal combustion engine 10 has an oil cooling circuit 24 according to a particularly preferred embodiment of the invention, in which oil for lubrication of bearings and for cooling and lubrication of the piston 16 in the cylinders 14 is encouraged. From the oil cooling circuit 24 supplied bearings are, for example, crankshaft bearings 26 and connecting rod bearings 28 a crank mechanism 30 ,

In the oil cooling circuit 24 gets the oil from an oil pump 32 funded, with a pump input line 34 to an oil pan 36 connected to the bottom of the engine block 12 is arranged and receives return oil from the camps and drip oil.

The oil pump 32 delivers oil through a pump outlet line 38 to a main junction 40 at which a first line 42 for supplying piston cooling units 44 and a second line 46 to supply the bearings 26 . 28 out.

The first line 42 which the piston cooling units 44 acting as oil spray nozzles 48 are formed, supplied with oil, has a first oil cooler 50 on, which is designed as an oil-water heat exchanger and to a cooling water system of the internal combustion engine 10 which is also the water jacket 22 supplied with cooling water. The first oil cooler 50 is used only for the cooling of the oil spray nozzles 48 leading oil.

In the flow direction of the oil in front of the oil cooler 50 is a first thermostat 52 arranged, which depending on the operating condition of the internal combustion engine 10 a first oil cooler 50 immediate bypass line 54 opens completely or partially and is preferably suitable, a flow through the first oil cooler 50 to stop completely with oil.

A second oil cooler 56 is downstream of a second thermostat 58 in the second line 46 intended. This second oil cooler 56 , in turn, as a to the cooling water system of the internal combustion engine 10 is formed connected oil-water heat exchanger, is used for the cooling of the camps 26 . 28 guided oil. By means of the second thermostat 58 and one the second oil cooler 56 immediate second bypass line 60 is the temperature of the bearings 26 . 28 adjustable oil adjustable.

Due to the schematic representation are in 1 only one cylinder 14 and a piston 16 visible, noticeable. With the oil cooling circuit according to the invention 24 But not only in 1 visible pistons 16 and the bearing assigned to it 26 . 28 supplied with oil, but all pistons and associated bearings, resulting in a first, in the first line 42 provided first branch 62 and one in the second line 46 provided second branch 64 is shown.

With the particularly preferred embodiment, an effective piston cooling with low friction power of the crank mechanism 30 achieved in a particularly good way.

10

Internal combustion engine

12

block

14

cylinder

16

piston

18

cylinder walls

20

channels

22

water jacket

24

Oil Kühlkeislauf

26

crankshaft bearings

28

connecting rod bearing

30

crankshaft

32

oil pump

34

Pump inlet line

36

oil pan

38

Pump output line

40

main branch

42

first management

44

Piston cooling units

46

second management

48

Oil spray nozzles

50

first oil cooler

52

first thermostat

54

first bypass line

56

second oil cooler

58

second thermostat

60

second bypass line

62

first branch

64

second branch

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 2546273 C2 [0002, 0002]
• - DE 23638437 A1 [0003, 0003, 0003]

Claims (8)

Oil cooling circuit of an internal combustion engine ( 10 ), with at least one oil pump ( 32 ) and at least a first oil cooler ( 50 ), as well as at least one first line ( 42 ) for supplying at least one first piston cooling unit ( 44 ) and at least one second line ( 46 ) for the supply of warehouses ( 26 . 28 ), characterized in that the first oil cooler ( 50 ) in the first line ( 42 ) for supplying the first piston cooling unit ( 44 ) is arranged. Oil cooling circuit according to claim 1, characterized in that in the first line ( 42 ) a first thermostat ( 52 ) is arranged, which preferably according to the cooling requirements of the piston cooling the temperature of the first line ( 42 ) to the first piston cooling unit ( 44 ) adjusted oil. Oil cooling circuit according to claim 1, characterized in that the first thermostat ( 52 ) has a control part and a control part, preferably such that in dependence on an operating phase, an internal combustion engine, a cooling or heating of a piston ( 16 ) through the oil. Oil cooling circuit according to one of claims 1 to 3, characterized in that the first line ( 42 ) at least one first branch ( 62 ), so that in addition to the first piston cooling unit ( 44 ) further piston cooling units of other pistons are supplied with oil. Oil cooling circuit according to one of claims 1 to 4, characterized in that the piston cooling units ( 44 ) as oil spray nozzles ( 48 ) are formed. Oil cooling circuit according to one of claims 1 to 5, characterized in that the first oil cooler ( 50 ) is designed as an oil-water heat exchanger. Internal combustion engine, with a cylinder cooling and an oil cooling circuit ( 24 ) for internal cooling, characterized in that the oil cooling circuit ( 24 ) is formed according to one of claims 1 to 6. Internal combustion engine according to claim 7, characterized in that the cylinder cooling is designed as water cooling, wherein preferably in a cylinder wall ( 18 ) a water jacket ( 22 ) is trained.