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 
• • 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 
  • F02F3/0076—Pistons  the inside of the pistons being provided with ribs or fins
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16J—PISTONS; CYLINDERS; SEALINGS
  • F16J1/00—Pistons; Trunk pistons; Plungers

Definitions

• the present invention relates to a piston for an internal combustion engine, comprising a piston head and a piston skirt.
• Pistons for internal combustion engines are exposed to significant loads during operation. This is especially true when the piston is provided with a piston shaft opposite the piston diameter. Such a piston has relatively large piston skirt areas, which are particularly exposed to side force loads.
• European Patent EP 0 188 108 B1 and Japanese Patent Application 2000-320 397 A describe pistons for internal combustion engines whose piston shaft is provided with a radially circumferential thickening along the inner wall. Such a thickening is ineffective for lateral force loads.
• the object of the present invention is to provide a piston for an internal combustion engine, with a piston head and a piston shaft which withstands side force loads particularly reliably.
• the solution consists in a piston with the features of claim 1. According to the invention it is provided that at least one parallel to the piston central axis extending reinforcing rib is provided on the inner wall of the piston skirt.
• the measure according to the invention of providing the inner wall of the piston skirt with at least one longitudinal reinforcing rib, that is to say parallel to the piston center axis, causes the piston shaft to be stabilized in the axial direction, so that it particularly assists lateral force loads occurring during operation. casually withstand.
• the number and arrangement of the reinforcing rib (s) is completely variable and only dependent on the overall construction or the field of application of the piston.
• the measure according to the invention is suitable for any piston construction, for example single or multi-part pistons, built-up pistons, etc.
• the at least one reinforcing rib extends from the region of the piston head or from the upper region of the piston skirt into the region of the free end of the piston skirt.
• the piston skirt is reinforced over its entire axial length, which causes a particularly reliable stabilization.
• the at least one reinforcing rib preferably proceeds continuously into the region of the piston head or upper region of the piston shaft, so that the forces acting on the piston shaft are absorbed and unimpeded.
• two or more reinforcing ribs are provided depending on the nature and strength of the loads occurring.
• the arrangement of two diametrically opposed reinforcing ribs has proven to be particularly effective, without the weight of the piston is increased too much. It is recommended in this case to arrange the two reinforcing ribs transversely to the longitudinal center axis of a piston provided in the hub bore.
• the at least one reinforcing rib may have any cross-section, wherein a substantially trapezoidal, circular segment-shaped, semicircular or rectangular cross-section has proven to be expedient.
• the at least one reinforcing rib can form a connecting web between the piston head and the piston shaft, in particular if a cooling channel with a cover of the open underside is provided in the piston head.
• FIG. 1a shows a first embodiment of a piston according to the invention in a two-part, sectional view, wherein the right part is rotated relative to the left part by 90 °.
• Fig. 1 b is a section along the line Ib in Figure 1 a;
• FIG. 2a shows a further embodiment of a piston according to the invention in a representation according to Figure 1a;
• Figure 2b is a section along the line IIb in Figure 2a;
• FIG. 3a shows a further embodiment of a piston according to the invention in a representation according to Figure 1a;
• Figure 3b is a section along the line MIb in Figure 3a;
• FIG. 4a shows a further embodiment of a piston according to the invention in a representation according to Figure 1a;
• FIG. 4b shows a section along the line IVb in FIG. 4a.
• Figures 1a and 1b show a first embodiment of a one-piece in this case the piston 10.
• the piston 10 has in a conventional manner, a piston head 11 with a combustion bowl 12 and a circumferential top land 13 and a circumferential ring portion 14.
• a circumferential cooling channel 15 is indicated by dash-dotted lines.
• the piston 10 also has, in a manner known per se, a piston stem 16 with running surfaces 17 integral with the piston head 11 in this embodiment.
• the piston head 11 is also known per se Way via hub connections 18 with hubs 19 which have hub bores 21 for receiving a piston pin, not shown.
• reinforcing ribs 25 On the inner wall 22 of the piston shaft 16, two diametrically opposed, parallel to the piston center axis A aligned reinforcing ribs 25 are arranged.
• the reinforcing ribs 25 bring about a stabilization of the piston shaft 16 in the axial direction, so that lateral force loads occurring during operation can be received particularly reliably.
• the reinforcing ribs 25 extend in the embodiment of the underside of the piston head 11, i. below the combustion bowl 12, into the region of the free end 23 of the piston skirt 16.
• the piston skirt 16 is stabilized over its entire axial length.
• the reinforcing ribs 25 in the exemplary embodiment are continuous, that is, without a sharp edge being provided, in the region of the piston head 11, so that the forces acting on the piston shaft 16 are absorbed and discharged particularly reliably.
• the arrangement of only two diametrically opposed reinforcing ribs 25 according to this embodiment also does not lead to a substantial increase in weight of the piston 10 of the invention. Nevertheless, a particularly effective stabilization of the piston shaft 16 is achieved by this arrangement. This is especially true when, as in this embodiment, the reinforcing ribs 25 are arranged transversely to the longitudinal center axis B of the hub bores 21.
• the reinforcing ribs 25 may have any desired cross-section, wherein a substantially trapezoidal, circular segment-shaped, semicircular or rectangular cross-section has proven to be expedient.
• FIGS. 2 a and 2 b show a further exemplary embodiment of a piston 110 constructed in this case.
• the piston 110 has, in a manner known per se, a piston head 111 with a combustion bowl 112 and a circumferential top land 113 and a circumferential ring section 114.
• the piston 110 also has an in In this embodiment, separate, connected to the piston head 111 in a conventional manner piston skirt 116 with treads 117 on.
• the piston shaft 116 is further connected in a conventional manner via hub connections 118 with hubs 119, which have hub bores 121 for receiving a piston pin, not shown.
• the piston head 111 and the piston shaft 116 enclose a circumferential cooling channel 115.
• reinforcing ribs 125 On the inner wall 122 of the piston shaft 116, two diametrically opposed, parallel to the piston center axis A and transverse to the longitudinal center axis B of the hub bores 121 aligned reinforcing ribs 125 are arranged, which have the function already described.
• the reinforcing ribs 125 extend in the exemplary embodiment from the upper end of the piston shaft 116 to the free end 123 of the piston shaft 116.
• the reinforcing ribs 125 are continuous in this embodiment, that is, without a sharp edge is provided, in the upper end of the piston shaft 116, so that the forces acting on the piston shaft 116 forces are absorbed and discharged particularly reliable.
• the reinforcing ribs 125 may have any cross-section, wherein a substantially trapezoidal, circular segment-shaped, semicircular or rectangular cross-section has been found to be useful.
• FIGS. 3a and 3b show a further exemplary embodiment of a piston 210 which is in one piece in this case.
• the piston 210 has, in a manner known per se, a piston head 211 with a combustion bowl 212 and a circumferential top land 213 and a peripheral ring section 214.
• the piston 210 also has, in a manner known per se, a piston shaft 216 with running surfaces 217 integral with the piston head 211 in this embodiment.
• the piston head 211 is further connected in known manner via hub connections 218 with hubs 219, which have hub bores 221 for receiving a piston pin, not shown.
• a circumferential, downwardly, ie towards the piston shaft 216 open towards cooling channel 215 is also provided in the amount of the ring portion 214, which is closed in a conventional manner by means of a cover 224.
• a recess 226 is provided between the piston head 211 and the piston shaft 216.
• reinforcing ribs 225 On the inner wall 222 of the piston shaft 216, two diametrically opposed, parallel to the piston center axis A and transverse to the longitudinal center axis B of the hub bores 221 aligned reinforcing ribs 225 are arranged with the function already described.
• the reinforcing ribs 225 extend in the exemplary embodiment of the upper portion of the piston shaft 216, approximately at the level of the hub connections 218, to the region of its free end 223.
• the reinforcing ribs 225 are continuous in the exemplary embodiment, that is, without a sharp edge is provided, in the upper region of the piston shaft 216, so that the force acting on the piston shaft 216 forces are absorbed and discharged particularly reliable.
• the reinforcing ribs 225 may also have any cross-section, wherein a substantially trapezoidal, circular segment, semicircular or rectangular cross-section has been found to be useful.
• Figures 4a and 4b show a further embodiment of a one-piece in this case piston 310.
• the piston 310 has in a conventional manner, a piston head 311 with a combustion bowl 312 and a peripheral land 313 and 313 a circumferential ring section.
• the piston 310 also has, in a manner known per se, a piston shaft 316 with running surfaces 317 integral with the piston head 311 in this embodiment.
• the piston head 311 is further connected in known manner via hub connections 318 with hubs 319, which have hub bores 321 for receiving a piston pin, not shown.
• a circumferential, downwardly, ie to the piston shaft 316 open towards cooling channel 315 is further provided in the amount of the ring portion 314, which is closed in a conventional manner by means of a cover 324.
• a recess 326 is provided between the piston head 311 and the piston shaft 316.
• two diametrically opposed, parallel to the piston center axis A and transverse to the longitudinal center axis B of the hub bores 321 aligned reinforcing ribs 325 are arranged with the function already described.
• the reinforcing ribs 325 extend in the exemplary embodiment of the upper portion of the piston shaft 316, approximately at the level of the hub connections 318, into the region of its free end 323. Thus, the piston shaft 316 is stabilized over its entire axial length. In the region of the recess 326, an opening 327 is formed on both sides of each reinforcing rib 325, so that in this area each reinforcing rib 325 forms a connecting web 328 between the piston head 311 and the piston shaft 316.
• the reinforcing ribs 325 are continuous in the exemplary embodiment, that is, without a sharp edge is provided at the end of each connecting web 328 in the lower part of the piston head 311, so that the forces acting on the piston shaft 316 forces are absorbed and discharged particularly reliable.
• the reinforcing ribs 325 may also have any cross-section, wherein a substantially trapezoidal, circular segment, semicircular or rectangular cross-section has been found to be useful.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=38356213

Family Applications (1)

Country Status (8)

Families Citing this family (6)

Family Cites Families (14)

• 2006
  • 2006-03-25 DE DE102006013905A patent/DE102006013905A1/de not_active Ceased
• 2007
  • 2007-03-23 BR BRPI0709177-0A patent/BRPI0709177A2/pt not_active Application Discontinuation
  • 2007-03-23 JP JP2009501843A patent/JP2009531583A/ja active Pending
  • 2007-03-23 KR KR1020087024485A patent/KR20080106335A/ko not_active Application Discontinuation
  • 2007-03-23 WO PCT/DE2007/000530 patent/WO2007110055A1/de active Application Filing
  • 2007-03-23 US US12/225,569 patent/US20090056534A1/en not_active Abandoned
  • 2007-03-23 EP EP07722089A patent/EP1999360A1/de not_active Ceased
  • 2007-03-23 CN CNA2007800104437A patent/CN101415928A/zh active Pending

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events