Classifications

• • 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
  • F01P3/00—Liquid cooling
  • F01P3/06—Arrangements for cooling pistons
  • F01P3/08—Cooling of piston exterior only, e.g. by jets
• • 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 
  • F02F3/0015—Multi-part pistons
  • F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
• • 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
  • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
  • F02F3/00—Pistons 
  • F02F3/0015—Multi-part pistons
  • F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
  • F02F2003/0061—Multi-part pistons the parts being connected by casting, brazing, welding or clamping by welding

Definitions

• This invention relates generally to expan- sible chamber devices and more particularly to pistons having lubricating means including chambers or pockets.
• an oil cooled piston including a crown having inner and outer annular walls.
• the walls define an annular groove including an annular opening.
• the outer wall has an end surface adjacent the opening.
• Means are provided for trapping fluid.
• Such means includes a substan ⁇ tially annular ledge extending from the inner wall toward the outer wall terminating at a lip. The lip is spaced from the end surface.
• a sloping surface on the ledge extends between the inner wall and the lip and is adjacent the annular opening.
• FIGURE 1 is an enlarged cross-sectional view illustrating an embodiment of the present invention
• FIGURE 2 is a bottom plan view taken along the line II-II of Figure 1;
• FIGURE 3 is another enlarged cross-sectional view illustrating an embodiment of the present invention.
• FIGURE 4 is a view taken along the line IV-IV of Figure 3;
• FIGURE 5 is an enlarged partial cross-sectional view illustrating the preferred embodiment of this invention.
• FIGURES 6-8 are enlarged partial cross-section- al views illustrating alternative embodiments of this invention.
• FIGURES 9,10 are enlarged partial cross- sectional views illustrating a cooling oil spray during the piston stroke. Best Mode for Carrying Out the Invention
• a piston is generally designated 10, Fig. 1, for reciprocating motion due to pin 12 and connecting rod 14 attached to piston boss 15 at one end 17 and to a crankshaft (not shown) at an opposite end in the well known manner. Also, a conventional cylinder liner 16 is provided for guiding the reciprocating action of piston 10.
• Piston 10 includes an upper crown portion 18 and a lower skirt portion 20.
• the lower skirt portion 20 is well known and includes partial skirts 20a, 20b.
• Crown portion 18 includes inner and outer wall portions 22,24, respectively, defining an annular groove 26 closed at an upper end 28 and having an open ⁇ ing at a lower end 30.
• Outer wall 24 includes conven ⁇ tional grooves 32 carrying compression rings 34.
• An annular relief 36 is provided between rings 34 and a relief 38 is provided below rings 34 for carrying oil control ring 40.
• Outer wall 24 terminates at end surface 42 just below oil control ring 40. Skirt portion 20 is just below end surface 42 and spaced therefrom by an opening 44. Inner wall 22 separates groove 26 from crown
• Wall 22 extends downwardly past opening 44 to pin boss 15.
• Piston 10 is preferably cast from iron to form a thin-walled, light-weight, one-piece unit.
• upper dome portion 18 could be cast separately from lower skirt portion 20 and the portions could then be welded together at 19 by a brazing process if desired.
• a conventional piston cooling jet 48 is fix ⁇ edly positioned adjacent lower skirt 20 for spraying a jet of fluid such as lubricating oil upwardly into annular groove 26 and cooling dome 46 as is known.
• the jet, Figures 9, 10 constantly sprays the oil upwardly to the underside of the crown 18. The spray is directed so that when the piston is bottom dead center or when the reciprocating piston 10 is at its lowermost position relative to the fixed jet 48, the spray bathes and cools groove 26 which has become heated due to proximity to crown 18.
• the spray bathes and cools dome 46 When the piston 10 is at top dead center, the spray bathes and cools dome 46. This momentary cooling is advantageous but does not continuously cool both the groove 26 and the dome 46.
• An improved splash sill 50 is provided as a means for trapping oil.
• Sill 50 is formed as a substantially annular ledge extending radially outwardly from inner wall 22 adjacent opening 44 and reaching toward outer wall 24.
• Ledge or sill 50 also extends axially upwardly toward crown 18.
• Ledge 50 terminates at lip portion 52 which is spaced from end surface 42.
• the preferred configuration for ledge 50 is illustrated in Fig. 5.
• a sloping upper surface 56 is provided on ledge 50.
• Surface 56 may be of a substantially constant slope such as that shown in Figs. 5-7 or may be curved or cup-shaped such as is shown in Fig. 8.
• Surface 56 provides ledge 50 with angular disposition relative to inner wall 22.
• ledge 50 and wall 22 cooperate to form a trough-like fluid trap.
• ledge 50 is most advantageously situated as described above, that is, extending outwardly from inner wall 22 and sloped upwardly toward crown 18. However, situated as such, ledge 50 is directly in the oil jet spray path extend ⁇ ing between jet 48 and groove 26.
• ledge 50 includes a slot 60 as a means for permitting the pressurized stream to be directed past ledge 50 and into groove 26, see Figs. 2 and 4.
• slot 60 is formed in duplicate (two slots 60, 180 de ⁇ grees diametrically opposed) for the purpose of pro ⁇ viding a piston which can be installed without concern as to the location of slot 60.
• only one jet 48 is usually provided, only one slot 60 is required.
• Piston 10 reciprocates downwardly to bottom dead center and jet 48 directs lubricating oil upwardly past ledge 50 via slot 60 into groove 26.
• the oil bathes and momentarily cools groove 26, thereafter drains downwardly and is trapped by ledge 50 as piston 10 accelerates upwardly to its top dead center position where the oil then bathes the dome 46.
• the foregoing has described an oil cooled piston having a ledge or splash sill which does not interfere with the spray of oil into the cooling groove and which better directs trapped oil back into the groove to supplement the spray.

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 (1)

Publications (3)

Family

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Family Applications (1)

Country Status (4)

Families Citing this family (23)

Citations (1)

Family Cites Families (15)

• 1979
  • 1979-04-23 JP JP54501735A patent/JPS6329104B2/ja not_active Expired
  • 1979-04-23 WO PCT/US1979/000259 patent/WO1980002308A1/en not_active Ceased
  • 1979-04-23 DE DE7979901340T patent/DE2965895D1/de not_active Expired
• 1980
  • 1980-11-04 EP EP79901340A patent/EP0027445B1/de not_active Expired

Patent Citations (1)

Non-Patent Citations (1)

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