EP0765439A1 - Culasse de moteur a piston etage - Google Patents
Culasse de moteur a piston etageInfo
- Publication number
- EP0765439A1 EP0765439A1 EP96912094A EP96912094A EP0765439A1 EP 0765439 A1 EP0765439 A1 EP 0765439A1 EP 96912094 A EP96912094 A EP 96912094A EP 96912094 A EP96912094 A EP 96912094A EP 0765439 A1 EP0765439 A1 EP 0765439A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder head
- segment
- parts
- head according
- washer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000003754 machining Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 6
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 238000005461 lubrication Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
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
- F02B33/00—Engines characterised by provision of pumps for charging or scavenging
- F02B33/02—Engines with reciprocating-piston pumps; Engines with crankcase pumps
- F02B33/06—Engines with reciprocating-piston pumps; Engines with crankcase pumps with reciprocating-piston pumps other than simple crankcase pumps
- F02B33/10—Engines with reciprocating-piston pumps; Engines with crankcase pumps with reciprocating-piston pumps other than simple crankcase pumps with the pumping cylinder situated between working cylinder and crankcase, or with the pumping cylinder surrounding working cylinder
- F02B33/14—Engines with reciprocating-piston pumps; Engines with crankcase pumps with reciprocating-piston pumps other than simple crankcase pumps with the pumping cylinder situated between working cylinder and crankcase, or with the pumping cylinder surrounding working cylinder working and pumping pistons forming stepped piston
-
- 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
- F02B75/28—Engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders
-
- 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
- F02F1/24—Cylinder heads
- F02F1/26—Cylinder heads having cooling means
- F02F1/36—Cylinder heads having cooling means for liquid cooling
-
- 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
- F01P2003/006—Liquid cooling the liquid being oil
-
- 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
- F01P3/02—Arrangements for cooling cylinders or cylinder heads
- F01P2003/024—Cooling cylinder heads
-
- 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
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
Definitions
- the present invention relates to a cylinder head, essentially an internal combustion engine comprising at least one stage piston, having advantageous characteristics as regards the tightness of the second stage of the piston and the optimization of the lubrication of one or more segments. related.
- stage piston engines comprise at least one cylinder in the bore of which is mounted a piston composed of two stages.
- the second stage of this piston cooperates with a cylinder head having the characteristic of being produced in a single block.
- On this second piston stage is generally provided at least one space intended to receive a sealing segment.
- This segment is therefore integral with the piston and movable with it.
- a radial slot is formed on the circumference of the segment.
- This embodiment has a major drawback: the sealing segment, integral with the second stage of the piston, follows its reciprocating movement. As a result, it is not possible to lubricate and cool this segment, which heats up a lot, wears out quickly and thus loses its effectiveness, creating during the explosion sealing defects damaging to the cylinder.
- the purpose of the cylinder head according to the invention is to remedy these problems by ensuring an optimized seal on the second stage of the piston by lubrication and cooling of the related segment, and by allowing easy and practical access to the segment to facilitate its setting. in place and its change.
- a cylinder head piston engine comprising two parts, an upper part and a lower part, between which is provided a space intended to accommodate a fixed sealing segment, continuous along its circumference and whose outer surface is in contact with oil flowing in the cylinder head portion in which the space is formed
- the two parts of the cylinder head according to the invention each comprise a cylindrical bore coaxial with that of the other part, bores which can be traversed by the second stage of the stage piston
- the space provided between the two parts of the cylinder head is defined by means of a washer.
- this space can be defined by means of one or more machining operations on one of the two parts or on the two parts. of the breech
- the segment which takes place in the space thus produced has an interior surface slightly protruding with respect to the surface of the cylindrical bores. This surface then comes to cooperate with the second stage of the stage piston which crosses the coaxial bores of the two cylinder head parts.
- the thickness of the segment is a few microns smaller than that of the washer, the segment then benefits from a precise adjustment in the space provided for its positioning.
- the upper and lower surfaces of the washer and of the segment are planar and lapped.
- the surfaces of each of the cylinder head parts in relation to these elements are themselves also planar and lapped.
- annular space is formed between the internal surface of the washer and the external surface of the segment.
- this annular space circulates pressurized oil intended to ensure the lubrication of the segment and the cooling of this segment and of the various constituent elements of the cylinder head
- two circular orifices respectively materializing the inlet and the outlet of pressurized oil are produced on the upper part of the cylinder head, each of these orifices being connected to the annular space
- the lower part of the cylinder head and the cylinder are produced in a single block. The upper portion of this cylinder is then formed by this cylinder head part.
- FIG. 1 is a sectional view of the cylinder head according to the invention
- FIG. 2 is a sectional view of the cylinder head and of its peripherals in operating mode
- FIG. 3 is a sectional view of another embodiment of the cylinder head according to the invention.
- the cylinder head according to the invention comprises two parts 3 and 5, hereinafter referred to respectively as the lower part and the upper part of the cylinder head.
- the upper part 5 is provided substantially at its center with a cylindrical bore 16.
- the lower part 3 has a concave conical bore 18 whose upper end ends in the form of a cylindrical bore 17 corresponding to the cylindrical bore 16 of the upper part 5 of the cylinder head.
- This part 3 is also provided at its lower base with a circular recess intended to ensure its centering on an element on which it rests.
- the cylinder head part 3 is provided at its upper surface with two or three pins or with two or three circular orifices; in a complementary manner, the cylinder head part 5 is provided at its lower surface with two or three studs or with two or three circular orifices, each stud being intended to cooperate with each circular orifice so as to center the two breech parts between they.
- the two parts 3 and 5 are crossed by eight to ten cylindrical holes 9 distributed regularly over the external surface of each part, these cylindrical holes being intended to receive means for fixing the two cylinder head parts together.
- a washer 20 is positioned between the two cylinder head parts. Its outer diameter corresponds substantially to the diameter of the circumference on which the inner edges of the fixing holes 9 are located. This washer has flat and lapped surfaces. Its surfaces correspond respectively with a portion of the lower surface of the part 5 and with a portion of the upper surface of the part 3, portions themselves flat and lapped.
- annular segment 4 continuous along its circumference, takes place between the two parts 3 and 5 of the cylinder head, in the space defined by the thickness of the washer 20.
- This segment has flat and lapped surfaces. Its surfaces correspond respectively with a portion of the lower surface of the part 5 and with a portion of the upper surface of the part 3, portions themselves flat and lapped.
- This segment has a thickness a few microns thinner than that of the washer 20, so that the adjustment thereof is carried out with great precision.
- the inner part of the segment, intended to cooperate with the piston, is slightly protruding with respect to the surface of the cylindrical bores 16 and 17.
- the radial dimensions of the washer 20 and of the segment 4 are provided to provide an annular space 15 between the internal surface of the washer and the external surface of the segment.
- These orifices are intended to accommodate end pieces, one per orifice, respectively illustrated 11 and 12 in Figure 2, connected to a pressure lubrication system; more specifically, the pressurized lubricant enters the nozzle 11 and exits through the nozzle 12 after circulation in the annular space.
- the cylinder head according to the invention rests on the jacket 50 of the cylinder 60 in which the first stage 10 of the piston operates, the rectilinear guidance of which is ensured by means of the rod 30 and the bearings 40.
- the second stage 2 of this piston has a continuous cylindrical outer surface and slides in the cylinder head, more precisely inside the cylindrical bores 16 and 17 of each of the parts 3 and 5 of the cylinder head.
- this second piston stage interacts with the interior surface of segment 4.
- This segment is lubricated and cooled by circulating pressurized oil inside the annular space 15.
- the lubricant enters this annular space according to arrow E and is discharged according to arrow S.
- This circulation of oil also has the effect of ensuring the cooling of the various components of the cylinder head.
- a slight machining can be carried out on the upper surface of the lower part 3 of the cylinder head, with the radial dimensions of the washer 20 and with a depth less than the thickness of the washer, at the location where this- Ci must be positioned, machining intended to wedge this washer in a housing; identically, such machining can be carried out on this same surface with the radial dimensions of the segment 4 and with a depth less than the thickness of the segment, at the location where the latter must be positioned, in order to ensure its precise timing.
- the washer defining the thickness of the space accommodating the segment can be replaced by a shoulder-shaped machining of the lower surface of the upper part 5 of the cylinder head as defined in FIG.
- This shoulder must have a width provided so as to provide the annular space 15 intended for the circulation of oil under pressure around the external surface of the segment 4.
- the shoulder in question can no longer be produced on the upper part but on the lower part of the cylinder head, in a last embodiment, such machining can be carried out simultaneously and in correspondence on the two cylinder head parts in a complementary manner
- the circular orifices 13 and 14 allowing the circulation of oil under pressure can be produced radially and no longer vertically in the upper part 5 of the cylinder head
- Two conduits 23 and 24, respectively in connection with the orifices 13 and 14, are then produced in order to connect these orifices to the annular space 15 in which the pressurized oil circulates
- Another variant may relate to the precise positioning of the two cylinder head parts between them, a variant in which the upper part 5 has on its lower surface a recess with the external dimensions of the lower part 3 of the cylinder head, the two parts coming to center the one on top of the other as shown in figure 3
- the lower part 3 of the cylinder head and the cylinder 60 are produced in a single block, more precisely, the one-piece cylinder / cylinder head part assembly thus formed then form a blind cylinder comprising in its upper portion a bore concave conical 18, the upper end of which ends in the form of a cylindrical bore 17 inside which the second stage 2 of the piston slides.
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)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9504571A FR2733007B1 (fr) | 1995-04-12 | 1995-04-12 | Culasse de moteur a piston etage |
FR9504571 | 1995-04-12 | ||
PCT/FR1996/000542 WO1996032581A1 (fr) | 1995-04-12 | 1996-04-11 | Culasse de moteur a piston etage |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0765439A1 true EP0765439A1 (fr) | 1997-04-02 |
EP0765439B1 EP0765439B1 (fr) | 1999-09-22 |
Family
ID=9478172
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96912094A Expired - Lifetime EP0765439B1 (fr) | 1995-04-12 | 1996-04-11 | Culasse de moteur a piston etage |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0765439B1 (fr) |
DE (1) | DE69604355T2 (fr) |
FR (1) | FR2733007B1 (fr) |
WO (1) | WO1996032581A1 (fr) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR504561A (fr) * | 1919-10-06 | 1920-07-08 | Joseph Micheloni | Moteur deux temps à compression préalable |
GB170969A (en) * | 1920-08-09 | 1921-11-09 | Walter Kirk Edgar | Improvements in two stroke internal combustion engines |
GB790508A (en) * | 1955-08-15 | 1958-02-12 | Hedges Motor Company Inc | Improvements in two-stroke internal combustion engines |
GB977678A (en) * | 1962-09-20 | 1964-12-09 | Ruston & Hornsby Ltd | Improvements in internal combustion engine cylinder heads |
US3404665A (en) * | 1966-07-19 | 1968-10-08 | Eugene R. Barnett | Power unit |
-
1995
- 1995-04-12 FR FR9504571A patent/FR2733007B1/fr not_active Expired - Fee Related
-
1996
- 1996-04-11 DE DE69604355T patent/DE69604355T2/de not_active Expired - Fee Related
- 1996-04-11 EP EP96912094A patent/EP0765439B1/fr not_active Expired - Lifetime
- 1996-04-11 WO PCT/FR1996/000542 patent/WO1996032581A1/fr active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO9632581A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1996032581A1 (fr) | 1996-10-17 |
DE69604355T2 (de) | 2000-08-10 |
DE69604355D1 (de) | 1999-10-28 |
FR2733007B1 (fr) | 1997-05-23 |
EP0765439B1 (fr) | 1999-09-22 |
FR2733007A1 (fr) | 1996-10-18 |
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