EP1781434A2 - Bloc-cylindres permettant la reduction du bruit, procede de moulage d'un tel bloc-cylindres - Google Patents
Bloc-cylindres permettant la reduction du bruit, procede de moulage d'un tel bloc-cylindresInfo
- Publication number
- EP1781434A2 EP1781434A2 EP05770967A EP05770967A EP1781434A2 EP 1781434 A2 EP1781434 A2 EP 1781434A2 EP 05770967 A EP05770967 A EP 05770967A EP 05770967 A EP05770967 A EP 05770967A EP 1781434 A2 EP1781434 A2 EP 1781434A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder block
- boxes
- longitudinal
- internal combustion
- combustion engine
- 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
- 238000000465 moulding Methods 0.000 title claims abstract description 8
- 238000000034 method Methods 0.000 title claims description 5
- 238000002485 combustion reaction Methods 0.000 claims abstract description 14
- 230000007246 mechanism Effects 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 230000002787 reinforcement Effects 0.000 claims description 15
- 230000007704 transition Effects 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000005192 partition Methods 0.000 description 6
- 230000005284 excitation Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000012010 growth Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/103—Multipart cores
Definitions
- Cylinder block, molding process and engine comprising such a cylinder block
- the invention relates to a cylinder block of an internal combustion engine as well as to an engine comprising such a cylinder block.
- the invention also relates to a molding process for the production of cylinder blocks according to the invention.
- the invention relates more particularly to a cylinder block comprising, an upper part comprising a plurality of cylindrical bores aligned in a longitudinal direction, a water envelope surrounding them, and a lower part, such as a skirt, delimiting a volume for a crankshaft mechanism.
- the combustion noises radiated by an internal combustion engine are a function of this combustion (which is the excitation phenomenon) and of the dynamic response (vibrations) of the Powerplant to this excitation.
- An object of the present invention is to overcome all or part of the drawbacks of the prior art noted above.
- the cylinder block according to the invention is essentially characterized in that at least one of the two longitudinal faces of the cylinder block comprises at minus a first set of boxes forming non-chambers communicating with each other and having a common external wall extending without discontinuity over part of the length of a longitudinal face.
- Each set or row of boxes constitutes a longitudinal reinforcement line. Furthermore, the vertical spaces delimiting the partitions of the boxes form a series of vertical reinforcements.
- the boxes have a thickness of between 15 and 30 mm approximately.
- the area covered by each set of boxes extends over a length of at least two thirds, and preferably at least three quarters, of the length of the longitudinal face of the casing, and each set of boxes has a height of between 3 and approximately 20% of the height of the longitudinal faces.
- the casing comprises at least two rows of boxes (i.e. 4 sets), a first row being for example located substantially at the transition between the bores intended to receive the pistons and the lower part of the cylinder block (or skirt) delimiting the volume for the crankshaft mechanism and a second row preferably located approximately halfway up the lower part of the cylinder block.
- a particularly simple means of carrying out the invention consists in modifying the central core used for molding the casing to form a series of protrusions which will delimit the volumes of the boxes. Under these conditions, boxes are advantageously obtained whose interior spaces communicate locally with the interior volume of the cylinder block, but without the boxes communicating with each other.
- the invention also relates to an internal combustion engine comprising a cylinder block conforming to any one of the preceding characteristics.
- - Figure 1 is a perspective view of a cylinder block according to the invention, cut transversely along a plane passing through the cylinder bore;
- - Figure 2 shows a side view of the cylinder block of Figure 1, on the exhaust side;
- - Figure 3 shows a side view of the cylinder block of Figure 1, on the intake side;
- FIGS. 4 and 5 respectively represent perspective views of the longitudinal faces of the cylinder block of FIGS. 1 to 3,
- FIG. 6 is a schematic view of an exemplary arrangement of a one-piece foundry core adapted to allow the molding of the cylinder block of FIGS. 1 to 5,
- FIG. 1 illustrates a cylinder block 1 of an internal combustion engine according to a preferred embodiment of the invention.
- the cylinder block 1 - of a generally essentially rectangular shape - comprises an upper part 2 comprising a plurality of vertical cylindrical bores 3 which are aligned in a longitudinal direction.
- the bores 3 delimit the cylinders of the engine intended to receive pistons.
- a water jacket 4 is provided in the upper part so as to surround the bores 3.
- the cylinder block 1 also comprises a lower part 5, such as a skirt, and delimiting a volume for a crankshaft mechanism (not shown).
- the upper 2 and lower 5 parts are made of a metallic material and are molded in one piece.
- this cylinder block is delimited vertically by an upper face intended to receive a cylinder head (not shown) and by a lower face intended to receive an oil pan for example.
- this cylinder block is delimited laterally by two longitudinal faces situated on either side of the alignment of the cylindrical bores 3 and two transverse faces.
- the longitudinal faces are sometimes called respectively "intake face” and “exhaust face”, with reference to the path of the fresh and burnt gases with respect to the cylinders.
- each of the longitudinal faces of the cylinder block 1 has two lines 6, 7 of longitudinal reinforcement.
- Each reinforcement line is in fact constituted by the juxtaposition of a series of boxes having a common external wall, but with a series of vertical walls which form partitions.
- the thickness of this external wall is between 4 and 5 mm approximately.
- the interior chamber defined by a box is typically between 15 and 30 mm.
- each row has a width of, for example, between 3 and 20% approximately of the height of the longitudinal faces (width of, for example, between 30 and 80 mm).
- Each row of boxes is preferably parallel to the direction of alignment of the cylindrical bores 3. More specifically, the reinforcing assemblies 6, 7 are preferably parallel to the upper and lower faces of the cylinder block 1.
- each row is partitioned, the external wall is continuous so that each assembly extends without discontinuity over substantially the entire length of the longitudinal faces of the cylinder block 1.
- the reinforcement assemblies can extend continuously over two thirds, and preferably at least three quarters, of the length of the longitudinal face.
- the longitudinal reinforcement rows are preferably centered on the middle part of the longitudinal face.
- the cylinder block is provided with two times two rows of reinforcement, with a first row 6 located substantially halfway up the lower part 4 of the cylinder block. This gives better transverse rigidity to the skirts, thus improving their bending behavior.
- a second reinforcing row 7 is preferably arranged substantially at the transition between the upper 2 and lower 4 parts of the cylinder block 1. That is to say that the first reinforcing line 15 is located at the connection between the barrels (cylinders 3) and the engine skirt.
- This longitudinal reinforcement line 7 allows better joining between the upper 2 and lower 3 parts of the cylinder block 1 and improves the behavior thereof when subjected to torsional forces.
- the invention thus allows a structural reinforcement of the cylinder block 1 and a reduction of the noises radiated by the engine when it is subjected to torsional and / or bending forces.
- the noise generated by the vibration of the block 1 is reduced from 2 to 3dB compared to known cylinder blocks.
- the attenuation of noise is particularly important around the frequencies between 2500 and 2700 Hz as well as between 1000 and 1800 Hz.
- a third row of reinforcement 8 is provided.
- the partitions delimiting two consecutive boxes of the same row also constitute vertical reinforcement lines arranged regularly along the longitudinal faces of the cylinder block. These reinforcement lines are oriented from bottom to top on the cylinder block.
- FIG. 3 illustrates a molding process which can advantageously be implemented for the production of cylinder blocks according to the invention.
- four arrangements of cylinder blocks are arranged in an aligned manner in a mold. More precisely, the arrangements of nuclei are associated in pairs. The arrangements of each pair are joined face down against face down - that is to say that there are two clusters of two cylinder blocks joined to their base.
- each core is provided with a series of protrusions.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Battery Electrode And Active Subsutance (AREA)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0450839A FR2869556B1 (fr) | 2004-04-30 | 2004-04-30 | Procede de moulage d'un bloc-cylindres |
| PCT/FR2005/001088 WO2005105338A2 (fr) | 2004-04-30 | 2005-04-29 | Bloc-cylindres permettant la reduction du bruit, procede de moulage d’un tel bloc-cylindres |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1781434A2 true EP1781434A2 (fr) | 2007-05-09 |
| EP1781434B1 EP1781434B1 (fr) | 2011-10-12 |
Family
ID=34945340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05770967A Expired - Lifetime EP1781434B1 (fr) | 2004-04-30 | 2005-04-29 | Bloc-cylindres permettant la reduction du bruit |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1781434B1 (fr) |
| AT (1) | ATE528088T1 (fr) |
| ES (1) | ES2371082T3 (fr) |
| FR (1) | FR2869556B1 (fr) |
| WO (1) | WO2005105338A2 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105855473B (zh) * | 2016-05-27 | 2018-10-19 | 江铃汽车股份有限公司 | 发动机缸体组芯工艺、发动机缸体砂芯及砂芯组 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3302250A (en) * | 1963-12-18 | 1967-02-07 | Gen Motors Corp | Core box and molding assembly for internal combustion engine blocks |
| DE4324609C2 (de) * | 1993-07-22 | 1997-10-16 | Avl Verbrennungskraft Messtech | Kurbelgehäuse für Brennkraftmaschinen |
| JPH11200943A (ja) * | 1998-01-12 | 1999-07-27 | Isuzu Motors Ltd | シリンダブロック構造 |
| US6533020B2 (en) * | 2001-06-11 | 2003-03-18 | General Motors Corporation | Casting of engine blocks |
-
2004
- 2004-04-30 FR FR0450839A patent/FR2869556B1/fr not_active Expired - Fee Related
-
2005
- 2005-04-29 AT AT05770967T patent/ATE528088T1/de not_active IP Right Cessation
- 2005-04-29 WO PCT/FR2005/001088 patent/WO2005105338A2/fr not_active Ceased
- 2005-04-29 ES ES05770967T patent/ES2371082T3/es not_active Expired - Lifetime
- 2005-04-29 EP EP05770967A patent/EP1781434B1/fr not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2005105338A2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1781434B1 (fr) | 2011-10-12 |
| WO2005105338A2 (fr) | 2005-11-10 |
| WO2005105338A3 (fr) | 2006-05-26 |
| FR2869556A1 (fr) | 2005-11-04 |
| ES2371082T3 (es) | 2011-12-27 |
| FR2869556B1 (fr) | 2006-06-02 |
| ATE528088T1 (de) | 2011-10-15 |
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