Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
  • F02F7/00—Casings, e.g. crankcases
  • F02F7/0065—Shape of casings for other machine parts and purposes, e.g. utilisation purposes, safety
  • F02F7/007—Adaptations for cooling
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
  • F02F1/00—Cylinders; Cylinder heads 
  • F02F1/02—Cylinders; Cylinder heads  having cooling means
  • F02F1/10—Cylinders; Cylinder heads  having cooling means for liquid cooling
  • F02F1/14—Cylinders with means for directing, guiding or distributing liquid stream
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
  • F02F1/00—Cylinders; Cylinder heads 
  • F02F1/02—Cylinders; Cylinder heads  having cooling means
  • F02F1/10—Cylinders; Cylinder heads  having cooling means for liquid cooling
  • F02F2001/104—Cylinders; Cylinder heads  having cooling means for liquid cooling using an open deck, i.e. the water jacket is open at the block top face
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
  • F02F1/00—Cylinders; Cylinder heads 
  • F02F1/02—Cylinders; Cylinder heads  having cooling means
  • F02F1/10—Cylinders; Cylinder heads  having cooling means for liquid cooling
  • F02F2001/106—Cylinders; Cylinder heads  having cooling means for liquid cooling using a closed deck, i.e. the water jacket is not open at the block top face

Definitions

• the invention relates to an internal combustion engine with at least one cylinder bank of cylinders arranged in series in at least one cylinder block and with at least one fluid cooling system assigned to a respective cylinder bank with at least one fluid channel formed in the cylinder block, which conducts fluid through the cylinder block as a water jacket adjacent to the cylinders for cooling them wherein the fluid channel in the cylinder block arranged between a cylinder head and a crankcase is delimited from a bottom on the crankcase side, according to the preamble of claim 1
• a cooling water channel in the form of a water box in the cylinder block, through which water flows as a cooling medium and which surrounds the cylinders with a water jacket at high flow rate of the cooling water
• the US-PS 4 455 972 describes a cylinder block with a water tank, wherein a wall extending in the flow direction divides the water tank into an upper and a lower section. Seen in the flow direction, the dividing wall is designed so that the upper section narrows , whereas the lower section widens.
• this arrangement is complicated and leads through the additional wall to turbulent flows, which hinder the removal of thermal energy through the cooling water
• a cooling system for a reciprocating piston internal combustion engine is known from EP 0 671 552 B1, an upper subchannel system assigned to the combustion chambers of the cylinders being open to a cylinder head and forming a uniform upper channel system with cooling fluid spaces in the cylinder head, the cooling fluid spaces located in the cylinder head being separated from the subchannel system in the cylinder block are supplied with cooling fluid through several passages distributed over a cylinder head base plate.
• EP 0 752 524 A1 discloses a cooling water jacket in a cylinder block for cylinders of an internal combustion engine, a flow width narrowing in a step-like manner perpendicular to the flow direction of the coolant in the direction of a crankcase closing the cylinder block, ie from top to bottom.
• these stages lead to undesirable turbulence in the water flow and accordingly hinder the cooling function of the flowing water.
• EP 0 196 635 A2 describes an internal combustion engine with at least two liquid-cooled cylinders lying one behind the other, a flow cross section of a cooling space between the cylinder block wall and cylinder wall being larger on one side of a respective cylinder than on a correspondingly opposite side.
• wide and narrow sections alternate from cylinder to cylinder.
• this has the disadvantage that turbulences form in the coolant flow at corresponding transition points between wide and narrow sections, which accordingly restrict effective dissipation of thermal energy by the cooling water.
• a cylinder block for an internal combustion engine is known from DE 32 47 663 C1, cooling water cavities in the cylinder block surrounding corresponding cylinders formed in the cylinder block.
• a lower area of the cooling water cavities is partially filled by a heat-resistant plastic material.
• the cylinder block can be subsequently adapted to different requirements with regard to the cooling conditions, but this is complex and cost-intensive.
• the filled cooling water cavity only corresponds to a cavity that has already been manufactured correspondingly smaller during the manufacture of the cylinder block. Special fluidic conditions with regard to turbulent flows that separate at the bottom of the cooling water cavities, in particular when the cooling water flows at high speed, are not taken into account.
• DE 24 17 925 C2 discloses a liquid-cooled multi-cylinder internal combustion engine, wherein an additional coolant chamber is provided separated from a water jacket surrounding the cylinders, which narrows horizontally in the direction of flow and opens downstream into the water jacket.
• an additional coolant chamber is provided separated from a water jacket surrounding the cylinders, which narrows horizontally in the direction of flow and opens downstream into the water jacket.
• DE-OS 2 058 094 describes a liquid-cooled multi-cylinder internal combustion engine with a cooling water channel which is cast into a cooling water chamber of a crankcase, is open towards a cylinder head and whose cross-section is continuously decreasing starting from a supply point for cooling water. This arrangement does not take into account either, that turbulent flows separate at the bottom of the cooling water cavities, especially at high flow rates of the cooling water.
• DE 41 40 772 A1 discloses a device for cooling webs between cylinders of a cylinder block of an internal combustion engine. These webs are arranged between cylinders cast together at least in the area of a cylinder block of an internal combustion engine and have cooling channels. Especially when the flow enters and exits the cooling channels of the webs or out of them, however, there is a turbulent flow which affects the cooling function of the coolant.
• the present invention is therefore based on the object of providing an internal combustion engine of the type mentioned above, the disadvantages mentioned above being overcome and an optimized laminar flow of the cooling fluid over an entire length of a cooling channel in the cylinder block being achieved.
• the bottom of the fluid channel is designed in the form of a curved plane.
• the curved plane is expediently designed such that in the direction of flow of the fluid in the fluid channel, a plurality of successive ridges are formed with correspondingly intermediate sinks, the ridges and ridges preferably following one another cyclically.
• a cylinder tube distortion during operation of the internal combustion engine is easier to control, since the water box formed by the fluid channel has a smaller expansion in the area of the cylinders.
• a particularly good laminar flow over the entire length of the fluid channel in the cylinder block is achieved in that the plane in cross section is a continuously differentiable curve.
• a particularly low-turbulence guidance of the fluid flow in the fluid channel is achieved in that the plane in cross section is a sine curve or cosine curve.
• a more homogeneous flow with largely avoiding turbulence when fluid flows from fluid ducts arranged on both sides of the cylinder meet is achieved by the bottom at a downstream end of the fluid duct, at which the fluid ducts on both sides reunite, converging towards the cylinder head by a predetermined length extending elevation, which deflects the respective fluid flows of the two-sided channels in the upstream in the direction of the cylinder head before their confluence.
• the fluid channel on the cylinder head side is closed by a cover (closed deck) or open, the latter variant advantageously having a fluid-conducting connection to a fluid system in the cylinder head in so-called.
• cover closed deck
• open deck construction realized.
• a cooling fluid such as cooling water
• the water tank or the fluid channel 10 is delimited by a bottom 16 in the figure below.
• the bottom 16 is designed as a curved surface, the surface running in a cross-section along the flow direction 14 in a wave-like manner, representing a sine curve.
• any other curvature with cyclically or non-cyclically successive mountains and valleys is possible according to the invention.
• Seen in the direction of flow in this exemplary embodiment 16 wave crests 18 and wave troughs 20 follow one another alternately on the bottom.
• the flow of the fluid thus follows this sine curve, with the formation of turbulence being largely avoided even at high flow velocities by guiding the flow on the floor in this way.
• such a forced flow improves the distribution and mixing of the fluid in the water tank, so that better cooling with less amount of fluid is possible.
• the curved surface of the base 16 is designed, for example, in such a way that 12 wave crests 18 essentially form in the cylinders. This achieves better controllability of a pipe warping of the cylinders 12 during the operation of the internal combustion engine by a geometry of the fluid around the cylinders 12 designed according to the distribution of the thermal energy on the cylinder walls.
• This elevation 24 is designed such that it deflects the two-sided flows of the fluid in the direction of the cylinder head in the figure upward, so that the two partial flows flow into one another at a downstream end 26 of the elevation 24 without any particular eddies.
• the increase 24 extends over a predetermined length in the direction of the cylinder head (in the figure in the upward direction). In a preferred embodiment, the elevation 24 rises over an entire height of the water tank to a parting plane between the cylinder block and the cylinder head.
• the vortex-free or turbulence-free mixing at the upper end 26 of the elevation 24 arises from the fact that by diverting the partial flows on both sides, they have essentially rectified flow vectors. Furthermore, the increase realizes a targeted water supply to the cylinder head.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Cylinder Crankcases Of Internal Combustion Engines (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7862069

Family Applications (1)

Country Status (7)

Families Citing this family (7)

Citations (11)

Family Cites Families (6)

• 1998
  • 1998-03-24 DE DE19812831A patent/DE19812831A1/de not_active Ceased
• 1999
  • 1999-02-17 JP JP2000538142A patent/JP4242068B2/ja not_active Expired - Fee Related
  • 1999-02-17 CN CN99804351A patent/CN1109191C/zh not_active Expired - Fee Related
  • 1999-02-17 EP EP99906243A patent/EP1066459B2/de not_active Expired - Lifetime
  • 1999-02-17 DE DE59901459T patent/DE59901459D1/de not_active Expired - Lifetime
  • 1999-02-17 ES ES99906243T patent/ES2175947T5/es not_active Expired - Lifetime
  • 1999-02-17 US US09/646,997 patent/US6397792B1/en not_active Expired - Fee Related
  • 1999-02-17 WO PCT/EP1999/001045 patent/WO1999049201A1/de not_active Ceased

Patent Citations (11)

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