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
  • F02F1/00—Cylinders; Cylinder heads 
  • F02F1/02—Cylinders; Cylinder heads  having cooling means
  • F02F1/10—Cylinders; Cylinder heads  having cooling means for liquid cooling
  • F02F1/16—Cylinder liners of wet type

Definitions

• the invention relates to an internal combustion engine with cylinder liners inserted into a crankcase according to the features specified in the preamble of claim 1.
• a wet-suspended cylinder liner is known, which is surrounded in the upper area by a relatively wide gap for receiving a water jacket. In the lower area, the liner is surrounded by a comparatively narrow tolerance gap, in which sealing rings are inserted to seal the water jacket. In order to avoid cavitation, a hardened silicone resin seal is arranged in the transition area from the wide to the narrow gap.
• the invention has for its object to provide an internal combustion engine with cylinder liners inserted into the crankcase, which is not sensitive to different thermal expansions between the crankcase and the cylinder liners.
• An elastomer which is arranged in the gap between the crankcase and the cylinder liner as an intermediate sleeve and has radially extending beads on one of its surfaces, bridges this gap elastically and can compensate for different thermal expansions between the crankcase and the cylinder liner. Furthermore, this elastomer seals one Water jacket against a crank chamber and dampens the acoustic and mechanical effect of the piston side forces.
• the intermediate bush can be arranged on the cylinder liner or in the receptacles. If the cylinder liner is dry, the intermediate liner can extend over the entire
• the sealing function for the water jacket is omitted.
• the beads can all be circular to the central axis of the
• Bundle of the cylinder liner In the latter case, the remaining beads are arranged parallel to the central axis.
• the intermediate bushing is designed with its maximum radial extent so that the width of the gap between the cylinder and the crankcase is safely bridged. Therefore, comparatively rough and inexpensive manufacturing tolerances can be selected.
• FIG. 1 is a partially cut cylinder liner according to a first embodiment of the invention in the ready-to-install state
• FIG. 3 shows a detail Y according to FIG. 1,
• Fig. 5 is a cylinder liner of a second embodiment of the invention partially cut in the ready-to-install state
• Fig. 6 shows a cylinder liner of a third embodiment.
• a cylinder liner 1 which is symmetrical with respect to its central axis XX and has an overall height H is suspended in a crankcase 2 of an internal combustion engine (only indicated) with an upper collar 3.
• the liner 1 has an outer diameter DA in an upper section A, which is slightly larger than an outer diameter DB of a lower section B.
• a water jacket 5 extends along the section A between the liner 1 and the crankcase 2.
• annular beads 7 are formed on the outer surface FA facing the crankcase 2, whereby a groove 8 is formed between adjacent beads 7.
• the beads 7 are delimited on both sides by oblique side surfaces 9, which are arranged at an angle W of approximately 65 * degrees to one another.
• the elastomer 6 has a bevel 12 at its end facing a crank chamber 11. Before insertion, the maximum radial extension R of the elastomer 6 is approximately 0.9 times the wall thickness K of the liner 1.
• the elastomer 6 fulfills several functions. First, it compensates for different thermal expansions between the z. B. made of gray cast iron and a liner made of an aluminum alloy crankcase 2. On the other hand, the acoustic forces and mechanical effects of the not shown, sliding in the bushing 1 piston transferred, changing lateral forces. Furthermore, the elastomer 6 also serves as a seal for the water jacket 5 with respect to the crank chamber 11 or vice versa. In addition, the elastomer 6 compensates for the manufacturing tolerances of the liner 1 or the receptacle 10 in that the maximum radial extension of the beads 7 is matched to the greatest possible width of the gap 4. If the liner 1 and the crankcase 2 are made of the same material, the elastomer mainly serves to isolate noise.
• the elastomer 6 extends over the entire height of the gap 4 of a dry liner 1.
• This arrangement has the same advantages as in the embodiment described above, but the sealing function compared to a water jacket is omitted.
• a third embodiment according to FIG. 6 only the beads 7 adjacent to the collar 3 are arranged in a ring around the central axis XX and thereby take over the sealing function for the water jacket 5.
• the further beads 7 extend parallel to the central axis XX.
• the lower end in turn forms an annular bead 7 provided with a bevel 12.
• the elastomer 6 can either be arranged on the liner I or in the receptacle 10 of the crankcase 2.
• the bevel 12 is arranged at the upper end of the elastomer 6.
• the number of beads 7 is selected so that the maximum stresses in the elastomer 6 are not exceeded at maximum lateral force of the piston. With low side forces, it may be sufficient compared to e.g. The embodiment shown in FIG. 1 to replace every second bead 7 by a correspondingly widened groove 8.
• the beads 7 are compressed, so that their radial extension R is shortened to approximately 0.8 to 0.9 times the dimension R '.
• the resulting side flanks 9 ' are at a significantly smaller angle to one another than the angle W.

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)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6432150

Family Applications (1)

Country Status (2)

Families Citing this family (2)

Citations (4)

Family Cites Families (1)

• 1991
  • 1991-05-22 DE DE19914116652 patent/DE4116652C1/de not_active Expired - Lifetime
• 1992
  • 1992-05-05 WO PCT/EP1992/000978 patent/WO1992020916A1/de active Application Filing

Patent Citations (4)

Non-Patent Citations (1)

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