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
  • F02F3/00—Pistons 
  • F02F3/16—Pistons  having cooling means
  • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
  • F02F3/22—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid
• • 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
  • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
  • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
  • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
  • F02B23/0696—W-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder wall
• • 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
  • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
  • F02B2275/14—Direct injection into combustion chamber
• • 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
  • F02B3/00—Engines characterised by air compression and subsequent fuel addition
  • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T10/00—Road transport of goods or passengers
  • Y02T10/10—Internal combustion engine [ICE] based vehicles
  • Y02T10/12—Improving ICE efficiencies

Definitions

• the present invention provides a diesel engine having a combustion chamber installed at a position eccentric from the center of the piston and having a shear oil hole for forced oil cooling therein.
• a diesel engine having a combustion chamber installed at a position eccentric from the center of the piston and having a shear oil hole for forced oil cooling therein.
• the piston of the conventional diesel engine has a combustion chamber 12 at the top of the piston 11 as shown in the cross-sectional view of the piston in FIG. It is installed at a position B eccentric from the center axis A.
• a shear force hole 16 for forced oil cooling is provided annularly below the periphery of the combustion chamber 12.
• the top groove 13 and the top of the piston are located at a position with a diameter of 15% to 20% of the diameter of the piston from the top of the piston.
• the second ring groove 14 and the oil ring groove 15 are respectively recessed at the positions of the dimensions of the piston diameter X 25% to 30%. .
• the dimension a between the inner wall of the eccentric side of the combustion chamber 12 and the bottom of the top ring groove 13 is small. If you try to make a shear force hole 16 for oil cooling, this part will be very thin. Piston depending on the structure 11 When manufacturing 1, the strength of the core in this area is low and it is difficult to manufacture.Therefore, forced oil cooling is performed near the combustion chamber with a high heat load. There is a problem in that it is not possible to form a shear hole 16 for use, and it must be provided below the periphery of the combustion chamber.
• the present invention focuses on such a conventional problem, and provides a large forced oil cooling shear hole even if the combustion chamber is eccentric from the center of the piston. Its purpose is to provide a diesel generator that can be placed close enough to the top to cool the hot parts of the load. It is said that.
• FIG. 1 is a sectional view of a diesel engine according to an embodiment of the present invention
• FIG. 2 is a sectional view of a conventional diesel engine. It is a figure. Disclosure of the invention
• the piston of the diesel engine according to the present invention has a piston diameter X5% to 10% from the top of the piston on the upper side of the piston.
• the top ring groove is placed at the position of the dimension of
• the second ring groove is placed at the position of the dimension of X 25 to 30% from the top of the piston.
• Each is provided with # 3
• the forced oil cooling shear hole is provided at a position between the top ring groove and the second ring groove.
• the forced oil cooling sheath The outer wall of the shear hole is D, the outer diameter of the outer wall of the power hole is D, and the bottom diameter of the top ring groove and the second ring groove is D j; Has a diameter of 0! ⁇ 0 2 — 4.
• the combustion chamber 2 is recessed about a position B eccentric from the center line A of the piston 1.
• a top groove 3 On the side surface of the piston 1, a top groove 3, a second ring groove 4, and an oil ring groove 5 are recessed from the top.
• the coupling groove 3 is larger than the top of the piston 1
• the oil ring groove 5 is also recessed at the conventional position.
• a forced oil cooling shear force hole 6 is formed in a rectangular shape.
• the outer diameter of the outer peripheral wall of the forced oil cooling shear hole 6 is 0 1 because the distance between the top ring groove 3 and the second ring groove 4 is large. and standing Tsu between in g groove 3 and the cell down mosquitoes down drill in g groove 4, the top-Li in g groove 3 parallel beauty the bottom diameter of the cell mosquitoes down drill in g groove 4 to the D z that when, that have Tsu Do and D 2 one 4 M or more diameters. That is,
• the present invention provides a diesel that can sufficiently cool a high heat load portion at the top of a piston even when the combustion chamber is eccentric from the center of the piston. Useful as an engine business.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Pistons, Piston Rings, And Cylinders (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=14663640

Family Applications (1)

Country Status (2)

Cited By (2)

Families Citing this family (1)

Citations (5)

Family Cites Families (1)

• 1989
  • 1989-09-28 JP JP1989115483U patent/JP2563402Y2/ja not_active Expired - Lifetime
• 1990
  • 1990-09-27 WO PCT/JP1990/001242 patent/WO1991005156A1/ja unknown

Patent Citations (5)

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