WO2012143639A1 - Fixed cylinder head engine with added‑in bearings - Google Patents
Fixed cylinder head engine with added‑in bearings Download PDFInfo
- Publication number
- WO2012143639A1 WO2012143639A1 PCT/FR2012/050719 FR2012050719W WO2012143639A1 WO 2012143639 A1 WO2012143639 A1 WO 2012143639A1 FR 2012050719 W FR2012050719 W FR 2012050719W WO 2012143639 A1 WO2012143639 A1 WO 2012143639A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bearing
- chamber
- cylindrical chamber
- cylindrical
- crankshaft
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- 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
- F02F1/002—Integrally formed cylinders and cylinder heads
-
- 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
- F02F7/00—Casings, e.g. crankcases or frames
- F02F7/0043—Arrangements of mechanical drive elements
- F02F7/0053—Crankshaft bearings fitted in the crankcase
Definitions
- the present invention generally relates to internal combustion engines which comprise at least one cylinder and a movable coupling, composed of the crankshaft, the connecting rod and the piston.
- the invention relates more particularly to a blind engine with internal combustion and the method of manufacturing said engine.
- the invention also relates to motor vehicles equipped with internal combustion engines with a blind motor according to the invention.
- the internal combustion blind engine comprises a cylinder head cast in one piece with the cylinder block, the cylinder head closing the upper part of the cylinder block.
- the breech portion includes an electric spark plug port and valve seats.
- the crankcase portion comprises a horizontal chamber called a crank chamber and housing a crankshaft and at least one cylinder, said cylinder comprises a chamber for housing a jacket in the form of a cylindrical tube in which a piston moves and which opens in its lower end in the crank chamber. Said liner is fitted into said chamber from below said cylinder through the crank chamber.
- a disadvantage relates to the molding of the blind motor with the crankshaft bearings. The bearings obtained raw molding must be machined to receive the axis of the crankshaft. This machining is made difficult by the reduced dimensions of the crank chamber.
- the bearings for maintaining the crankshaft axis are generally obtained by molding near the chamber intended to house the jacket and must be spaced apart sufficiently to allow the fitting of said jacket from below. This spacing is substantially greater than the outer diameter of the jacket.
- the size of said engine is not optimized.
- An object of the invention is to overcome these disadvantages and the invention relates to a blind engine with internal combustion comprising at least one chamber adapted to receive a shirt intended to guide the movements of a piston whose manufacture is simple, with an optimized size and at a relatively low cost.
- the present invention also provides a method for producing such an engine.
- the manufacturing process of the blind motor according to the invention comprises the following steps:
- a blind motor comprising at least one cylinder intended to receive a jacket
- the molding of the blind motor comprises a single core defining the cylindrical chamber intended to receive the jacket.
- the liner is nested in the chamber from below and is held fixed by a bumper screwed into the wall of the connecting rod chamber near the chamber intended to receive the liner.
- holes are drilled and tapped into the upper wall of the connecting rod chamber and intended to receive the screws for fixing the crankshaft bearings.
- guide rings are introduced into the fixing holes to assist the positioning of the crankshaft bearings.
- the bearings and the bearing caps surrounding the crankshaft are fixed by the fixing screws in the wall of the crank chamber.
- Figure 1 is a bottom sectional view according to section BB of Figure 2.
- Figure 2 is a cross-sectional view of the blind motor of Figure 1 in section AA with all components mounted.
- Figure 3 is a perspective view of the inner core of the sand mold, for forming the recessed portion in the engine.
- FIG. 4 is a sectional view of the blind motor obtained after demoulding according to section AA of FIG. 1.
- Figure 5 is a sectional view of the blind motor according to section CC of Figure 1 before the fixing of the bearings.
- Figure 6 is a sectional view of a half of the blind motor according to section CC of Figure 1, where the bearings are assembled.
- Figure 1 schematically shows a bottom view according to section BB of Figure 2 of an internal combustion engine according to the invention.
- a portion of a crankshaft 15 is held by bearings 16 and bearing caps 17 along the longitudinal axis x.
- a cylindrical chamber 1 1, inside a cylinder 10 is located between two bearings 16 and houses a cylindrical jacket 20. At least a portion of the bearings 16 is below the base surface of the cylindrical chamber January 1.
- the engine 1 according to the invention is a blind motor consisting of a cylinder head portion 12 and a cylinder block portion 13 in one piece obtained by molding. Said crankcase portion 13 is closed in the upper part by the cylinder head portion 12 and in the lower part by a not shown oil pan.
- the cylinder head portion 12 comprises at least one exhaust duct 26, said duct opening into a combustion chamber roof 33 which forms a substantially conical cavity and whose object is to improve combustion.
- the cylinder head portion 12 supports at least one valve 27 which closes the access to said duct 26.
- Said valve 27 opens access to said duct 26 during the exhaust phase of the flue gases.
- Said valve 27 moves in a longitudinal movement along an inclined axis with respect to the vertical axis Z, following the engine combustion stresses.
- the valve 27 bears on a valve seat 34 to close the condition 26.
- the cylinder head also supports injection and ignition devices (not shown).
- the crankcase portion 13 comprises at least one vertical cylinder 10 and surrounding the cylindrical chamber 1 1 which opens at its upper end into the cavity of the roof chamber 33 in the cylinder head portion 12 and in its lower end in a crank chamber 14 disposed substantially horizontally along the longitudinal axis x.
- Said cylindrical chamber 1 1 is obtained from a foundry and shaped to accommodate a substantially tubular jacket 20.
- the crank chamber 14 houses the crankshaft 15 which rotates about the x axis and is connected to rods 22 by their low ends by pivot links. The upper ends of said connecting rods are connected to a piston 21 which slides in the bore 23 of the jacket 20, with reciprocating movements.
- the crankshaft 15 is held by at least one bearing 16 and a bearing cap 17, surrounding said crankshaft and arranged transversely with respect to the axis of rotation of the crankshaft 15.
- the blind motor 1 is preferably obtained by casting cast iron with a sand mold.
- the mold consists of a first outer core (not shown) consisting of sand intended to form the outer casing and a second inner core 2 also made of sand intended to form the part hollowed out in the motor which are the connecting rod chamber 14 and the cylindrical chamber 1 1.
- Said inner core 2 is continuous, and comprises a first portion 32 of substantially semi-cylindrical shape of longitudinal axis, and surmounted perpendicularly by at least a second cylindrical portion 30 of height h.
- Said first portion 32 comprises, next to the second cylindrical portion 30, at least two cavities 44 hollowed transversely on one side and the other of the longitudinal axis.
- Said second cylindrical portion 30 comprises an upper end terminated by at least one first substantially conical boss 29 and whose base diameter is substantially smaller than the diameter of the second cylindrical portion. This has the effect of forming a second reference bearing surface 43 in the high end or ceiling of the cylindrical chamber January 1 after demolding.
- a second substantially cylindrical and oblique boss 31 intended to form a bevelled zone 35 is added on a transverse side of the cylindrical part 30 from the lower end of said portion 30.
- the cavities 44 give way to two bosses 45 in the ceiling of the wall of the connecting-rod chamber 14, said bosses have a substantially flat top intended to form a first reference bearing surface 40 for fixing the bearings 16 of the crankshaft.
- the second cylindrical portion forms the cylindrical chamber 1 1 with a height h.
- a tubular liner 20 is nested in the cylindrical chamber 1 1 to the ceiling of said chamber in contact with the second reference bearing surface 43. Its height is substantially greater than the height h of the cylindrical chamber 1 1 in such a way it protrudes slightly from said chamber 1 1, in the crank chamber 14.
- the blind motor 1 according to the invention comprises at least one support bearing 16 of the crankshaft support, which is attached and fixed in the ceiling of the connecting rod chamber 14 by screwing on the first reference bearing surface 40.
- the steel bearing 16 is preferably obtained by molding and comprises a lower part 39 and an upper part 38.
- the lower portion 39 is in the form of a rectangular parallelepiped and comprises an upper side wall 41 and a lower side wall 42.
- the upper side wall 41 comes into partially contacting the first reference bearing surface 40.
- the lower part 39 comprises two vertical holes 37 along the z-axis at the left edge and at the right edge along the y-axis width, intended for the passage of the fixing screws and facing the threaded holes 19 during the fixing of the bearings. It also comprises a substantially semi-cylindrical recess concave on the lower side wall 42, of longitudinal axis x, substantially in the center of said wall and whose radius is substantially greater than the radius of the axis of the crankshaft 15.
- the width of the lower part 39 optimizes the fixing position of the bearing in the ceiling of the crank chamber 14.
- the upper portion 38 of the bearing is substantially in the form of a rectangular parallelepiped attached to the lower portion 39 on its upper side wall 41. It has a width (along the y axis) lower than that of the lower portion 39 and a thickness (according to the axis x) such that at least a portion of the upper portion is below the base surface of the cylindrical chamber 1 1, once the bearing fixed on the wall of the connecting chamber chamber 14.
- the height of said upper portion 38 cumulative with the height of the tubular liner 20 is substantially equal to the difference in level between the first reference bearing surface 40 and the second reference bearing surface 43.
- the upper portion 38 bears on the tubular liner 20 and maintains it fixed in the cylindrical chamber 1 1.
- the bearing cap 17 is a piece also in the shape of a rectangular parallelepiped made of steel, substantially identical to the lower part of the bearing 16. It thus comprises a width (along the y axis) and a thickness (along the x axis).
- the blind motor 1 is returned to present the connecting rod chamber 14 facing upwards.
- the bosses 45 are machined to define the first reference bearing surface 40.
- Vertical holes 19 are drilled in said reference bearing surface 40 and are then threaded.
- Centering rings 36 in the form of tubular steel cylinders, are inserted in the holes 19 so as to have a portion protruding from the first reference bearing surface 40.
- the jacket 20 is then fitted into the cylindrical chamber 1 1 of the blind motor 1 to contact with the second reference surface 43.
- the bearing 16 with the semi-cylindrical recess facing upwards is pressed against the first reference bearing surface 40 in such a way that the centering rings 36 installed in the fixing holes 19 also fit into the holes 37.
- the blind motor is then ready to accommodate the movable hitch, consisting of a piston, a connecting rod and the crankshaft.
- the piston 21 associated with the connecting rod 22 which is connected to the crankshaft 15 is fitted into the bore 23 of the liner 20.
- the crankshaft 15, in a conventional manner, is then placed resting on the bearings 16, the bearing caps 17 are then fixed by screws 18 passing through the bearing cap 17 and the bearing 16, screwed into the fixing holes 19 in the connecting chamber 14.
- the present invention teaches a method of manufacturing an internal combustion engine, simple and easy to manufacture, comprising at least one cylinder in which is fitted a liner and whose length is optimized. It is not limited to the embodiment described and shown, and the skilled person will be able to provide any variant within his mind.
- the spacing of the cylinders can be greatly reduced.
- the upper part of the bearing 16 bears on the two adjacent liners and secures them in the cylindrical chambers.
- the molding may be by injection of metallic material of steel or aluminum.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR112013025334-7A BR112013025334B1 (en) | 2011-04-21 | 2012-04-03 | manufacturing process for an internal combustion engine with a fixed cylinder head, and an internal combustion engine with a fixed cylinder head |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1153463A FR2974318B1 (en) | 2011-04-21 | 2011-04-21 | ENGINE BORGNE WITH RAISED BEARINGS |
FR1153463 | 2011-04-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2012143639A1 true WO2012143639A1 (en) | 2012-10-26 |
Family
ID=46025779
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2012/050719 WO2012143639A1 (en) | 2011-04-21 | 2012-04-03 | Fixed cylinder head engine with added‑in bearings |
Country Status (3)
Country | Link |
---|---|
BR (1) | BR112013025334B1 (en) |
FR (1) | FR2974318B1 (en) |
WO (1) | WO2012143639A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104476127A (en) * | 2014-11-19 | 2015-04-01 | 柳州科尔特锻造机械有限公司 | Cylinder head machining process |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1151859A (en) | 1956-06-25 | 1958-02-06 | Calumet & Hecla | Tube spinning process and industry |
DE3715200A1 (en) * | 1987-05-07 | 1988-11-24 | Kloeckner Humboldt Deutz Ag | Internal combustion engine |
DE3815508C1 (en) * | 1988-05-06 | 1989-08-24 | Daimler-Benz Aktiengesellschaft, 7000 Stuttgart, De | |
JPH041452A (en) * | 1990-04-17 | 1992-01-06 | Nissan Motor Co Ltd | Integral cylinder block for internal combustion engine |
JPH0650206A (en) * | 1992-07-31 | 1994-02-22 | Nissan Motor Co Ltd | Engine block construction for internal combustion engine |
US5419037A (en) * | 1994-05-20 | 1995-05-30 | Outboard Marine Corporation | Method of inserting, boring, and honing a cylinder bore liner |
-
2011
- 2011-04-21 FR FR1153463A patent/FR2974318B1/en active Active
-
2012
- 2012-04-03 BR BR112013025334-7A patent/BR112013025334B1/en active IP Right Grant
- 2012-04-03 WO PCT/FR2012/050719 patent/WO2012143639A1/en active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1151859A (en) | 1956-06-25 | 1958-02-06 | Calumet & Hecla | Tube spinning process and industry |
DE3715200A1 (en) * | 1987-05-07 | 1988-11-24 | Kloeckner Humboldt Deutz Ag | Internal combustion engine |
DE3815508C1 (en) * | 1988-05-06 | 1989-08-24 | Daimler-Benz Aktiengesellschaft, 7000 Stuttgart, De | |
JPH041452A (en) * | 1990-04-17 | 1992-01-06 | Nissan Motor Co Ltd | Integral cylinder block for internal combustion engine |
JPH0650206A (en) * | 1992-07-31 | 1994-02-22 | Nissan Motor Co Ltd | Engine block construction for internal combustion engine |
US5419037A (en) * | 1994-05-20 | 1995-05-30 | Outboard Marine Corporation | Method of inserting, boring, and honing a cylinder bore liner |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104476127A (en) * | 2014-11-19 | 2015-04-01 | 柳州科尔特锻造机械有限公司 | Cylinder head machining process |
CN104476127B (en) * | 2014-11-19 | 2017-04-19 | 泉州格罗特机电设备有限公司 | Cylinder head machining process |
Also Published As
Publication number | Publication date |
---|---|
FR2974318B1 (en) | 2014-10-17 |
BR112013025334A2 (en) | 2017-07-25 |
FR2974318A1 (en) | 2012-10-26 |
BR112013025334B1 (en) | 2021-05-25 |
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