Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
  • F02B75/00—Other engines
  • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
  • F02B75/18—Multi-cylinder engines
  • F02B75/22—Multi-cylinder engines with cylinders in V, fan, or star arrangement
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
  • F01P5/00—Pumping cooling-air or liquid coolants
  • F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
  • F02B75/00—Other engines
  • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
  • F02B75/18—Multi-cylinder engines
  • F02B2075/1804—Number of cylinders
  • F02B2075/1832—Number of cylinders eight

Definitions

• the invention relates to a cooling circuit arrangement for an internal combustion engine according to the features of the preamble of claim 1.
• Such an arrangement is known, for example, from EP 0 219 351 A2, in which the cooling jackets integrated in the cylinder banks are supplied with coolant by a coolant pump which is arranged on an end face of the internal combustion engine between the V-shaped cylinder banks.
• a collecting line for the coolant flowing back from the cylinders and a cooler circuit is arranged on the other end of the internal combustion engine. Due to the manifold provided with several connections, the actual dimensions of the internal combustion engine are exceeded, so that especially when the engine is installed lengthways in the vehicle, space is required which is no longer available to the passenger compartment.
• the invention has for its object to provide a structural arrangement for a cooling circuit in an internal combustion engine with V-shaped cylinders, in which the available free spaces are used so that the actual dimensions of the internal combustion engine are not exceeded.
• a compact control unit can be realized between the two cylinder banks, with which a small and large coolant circuit and a heating circuit can be operated.
• the control unit is arranged together with the coolant pump in the installed state of the internal combustion engine in the vehicle, viewed in the direction of travel, on the front end of the internal combustion engine, it is easily accessible for maintenance and repair work.
• the lower part of the two return chambers which consist of one structural unit, is advantageously cast into the upper part of the crankcase together with the housing of the coolant pump.
• FIG. 1 shows an internal combustion engine in a schematic overall view
• FIG. 2 shows a front view of the internal combustion engine designed as a V-engine
• FIG. 3 shows a section along the line HI-HI in FIG. 2
• FIG. 4 shows a section along the line IV-IV in FIG Fig. 2 and Fig. 5,6 two plan views of a partial section of the internal combustion engine.
• the V8 engine shown in Fig.l consists of a crankcase lower part 10 and a crankcase upper part 12, in which two rows of cylinders 1 to 4 and 5 to 8 are arranged in a V-shape to each other.
• a cylinder head housing 14 connects to the crankcase upper part 12 for each row of cylinders.
• the construction of both rows of cylinders is identical, only the cylinder head housing 14 for cylinder rows 1 to 4 (in the view on the left) being shown in FIG.
• Both rows of cylinders have cylinder cooling jackets 16 and 18 surrounding the cylinder running surfaces, the cylinder cooling jackets 16, 18 being assigned only to the upper region of the cylinder running surfaces; the length I of the cylinder cooling jackets 16, 18 amounts to approximately 1/2 the total length of the individual cylinders or cylinder running surfaces.
• the slot-like openings 24 arranged on the end face of the cylinder cooling jackets 16, 18 are closed with the aid of a cylinder head gasket (not shown). Cooling jackets are also arranged in the cylinder head housing 14 and are referred to below as cylinder head cooling chambers 20, 22.
• the cooling chamber cross section 22 has been shown for the right row of cylinders (cylinders 5 to 8).
• the spiral-shaped housing 26 of a water pump is arranged between the two rows of cylinders, the cover part of the water pump, not shown, receiving the turbine wheel driven via the crankshaft for generating the coolant flow.
• a structural unit 27 is provided which, among other things, has a return chamber 28 which, as will be described in more detail later, forms the return for the coolant from the cylinder cooling jackets 16, 18 and the cylinder head cooling chambers 20, 22.
• the pressure-side outlet 30 of the water pump housing 26 is connected to a coolant distributor pipe 34 via a coolant pipe 32, which extends between the two rows of cylinders to the other end of the internal combustion engine.
• the coolant distributor pipe 34 has two connections 36, 38, each configured as a connecting piece, which are shown in FIG. 1 only for the right cylinder row (cyl. 5-8).
• the first connecting pieces 36 are connected to the longitudinally flowed cooling jackets 16, 18 arranged in the cylinder block, while the second connecting pieces 38 are connected to outer longitudinal coolant channels 40, 41 cast into the crankcase upper part 12.
• the outer longitudinal coolant channels 40, 41 have inlet openings 47 assigned to the individual cylinder head units, via which the coolant is guided into the cylinder head cooling chambers 20, 22.
• the assembly 27 has in addition to the return chamber 28, a second return chamber 56, which is controlled by a first valve plate 51 of a thermostat 52 opening 54 with the first return chamber 56 and the suction port 31 of the Pump housing 26 is connected.
• the assembly 27 consisting of the two return chambers 28 and 56 and the thermostat 52 is constructed in two parts, the lower part of the assembly 27 being cast together with the pump housing 26 in the crankcase upper part 12 between the two cylinder banks.
• the housing cover 66 of the assembly 27 receiving the thermostat 52 is screwed to the lower part of the assembly 27.
• the second valve plate 53 of the thermostat 52 controls a return opening 58 leading to the second return chamber 56, the connection 59 connected to the first return chamber 28 forming the flow and the connection 61 connected to the second return chamber 56 forming the return of a coolant circuit, not shown in any more detail.
• the second return chamber 56 is further connected to the return line 60 of a heating circuit, not shown, and a line 62 leading to an expansion tank. Starting from the first return chamber 28, a line 64 forms the heating flow.
• the coolant circuit activated in the engine warm-up phase hereinafter referred to as the small coolant circuit, works as follows:
• the opening 54 between the first return chamber 28 and the second return chamber 56 is opened by the first valve plate 51 of the thermostat 52 (see FIG. 4), so that the coolant from the first return chamber 28 into the second return chamber 56 arrives. From there, it is conveyed into the coolant pipe 32 via the intake port 31 of the water pump housing 26 and via the coolant distributor pipe 34 to the cylinder cooling jackets 16 arranged in the cylinder block, 18 and via the outer longitudinal coolant channels 40, 41 to the cylinder head cooling chambers 20, 22 arranged in the cylinder head housing 14.
• a throttle 50 is provided in the cylinder cooling jackets 16, 18, with the aid of which the flow resistance is adjusted in such a way that 70 to 80%, preferably 75%, of the coolant stream circulated for engine cooling passes into the cylinder head housing 14 via the outer longitudinal coolant channels 40, 41 ,
• the specified percentage distribution of the coolant flow ensures that the cylinder head housing 14 and the cylinder block, which are subjected to high temperatures, are cooled as required.
• a switch is made to a large coolant circuit, in which, as is known, the cooler circuit is also included.
• the opening 54 is closed by the first valve plate 51 of the thermostat 52, while the opening 58 controlled by the second valve plate 53 is released to the cooler circuit.
• This activates the cooler circuit, in which the coolant, after it has passed through the small coolant circuit, reaches the second return chamber 56 via the supply connection 59, the cooler (not shown) and the return connection 61.

Landscapes

• 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)
• Valve Device For Special Equipments (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7640639

Family Applications (1)

Country Status (7)

Families Citing this family (8)

Family Cites Families (8)

• 2000
  • 2000-05-03 DE DE10021526A patent/DE10021526C2/de not_active Expired - Fee Related
• 2001
  • 2001-03-29 EP EP01927830A patent/EP1280985B1/fr not_active Expired - Lifetime
  • 2001-03-29 WO PCT/EP2001/003572 patent/WO2001083959A1/fr not_active Ceased
  • 2001-03-29 US US10/019,671 patent/US6595166B2/en not_active Expired - Lifetime
  • 2001-03-29 JP JP2001580554A patent/JP2003532017A/ja not_active Withdrawn
  • 2001-03-29 AT AT01927830T patent/ATE348253T1/de not_active IP Right Cessation
  • 2001-03-29 DE DE50111637T patent/DE50111637D1/de not_active Expired - Lifetime
  • 2001-03-29 ES ES01927830T patent/ES2274881T3/es not_active Expired - Lifetime

Non-Patent Citations (1)

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