GB2340882A - Construction of oil passages in an I.C. engine block by casting - Google Patents
Construction of oil passages in an I.C. engine block by casting Download PDFInfo
- Publication number
- GB2340882A GB2340882A GB9818684A GB9818684A GB2340882A GB 2340882 A GB2340882 A GB 2340882A GB 9818684 A GB9818684 A GB 9818684A GB 9818684 A GB9818684 A GB 9818684A GB 2340882 A GB2340882 A GB 2340882A
- Authority
- GB
- United Kingdom
- Prior art keywords
- block
- engine block
- oil pump
- passage
- oil
- 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.)
- Withdrawn
Links
- 238000005266 casting Methods 0.000 title description 2
- 238000010276 construction Methods 0.000 title description 2
- 238000011065 in-situ storage Methods 0.000 claims abstract description 5
- 238000002485 combustion reaction Methods 0.000 abstract description 2
- 238000004513 sizing Methods 0.000 abstract description 2
- 238000005553 drilling Methods 0.000 description 5
- 238000003754 machining Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
- F01M11/02—Arrangements of lubricant conduits
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
An internal combustion engine block 20 has an oil passage 24 leading from an oil pump recess 22 to a crankcase (not shown) where the oil passage is cast in situ. This allows greater freedom when designing the passage in its sizing, i.e allowing a non-circular cross section, and in its routing, i.e allowing the path to be a non-straight line.
Description
2340882 Engine Block
Field of the invention
The present invention relates to an engine block having an oil pump mounted thereon and an oil passage formed within t-he block leading from the crankcase end of the engine block to the oil pump.
Background of the invention
In a conventional internal combustion engine in which the block is formed with an internal passage to connect the oil pump to the crankcase, it is customary to form the passage either as a single drilling or as two drillings joining each other under an angle, which are machined into the block after the block has been cast. When the oil passage is formed in this way, its diameter is limited by the geometry of the block in as much as the drillings have to be straight and must not encroach on any other element of the engine. As will be appreciated, a reduced diameter could lead to pump cavitation while abrupt changes of direction where the drillings meet create turbulence and frictional losses.
Object of the invention The present invention seeks to provide an engine block in which these constraints are avoided to allow the cross section of the passage connecting the oil pump to the crankcase to be optimised.
Summary of the invention
According to the present invention, there is provided an engine block having an oil pump mounted thereon and an oil passage formed within the block leading from the crankcase end of the engine block to the oil pump, wherein the oil passage is cast in situ within the block.
Because the oil passage leading to the oil pump is cast in situ instead of being drilled into the block, it need not be circular and its route from the crankcase face of the engine block to the oil pump need not follow a straight line, thereby allowing its cross sectional area to be optimised.
Brief description of the drawings
The invention will now be described further, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a view of a known engine block which is partly cut away to show the passage connecting the oil pump to the crankcase, Figure 2 is a view from below of the engine block shown in Figure 1, Figures 3 and 4 are views corresponding to Figures 1 and 2, respectively, showing an engine block embodying the invention, and Figure 5 is a perspective view of a core of a mould used in the casting of the block shown in Figures 3 and 4.
Detailed description of the preferred embodiments
The engine block 10 shown in Figures 1 and 2 is generally conventional and need not therefore be described in detail as its construction will be clear to the person skilled in the art. The drawings show the bottom end of the block 10 and the saddles 16 for the crankshaft main bearings.
3 A recess 12 is formed in an axial end face of the engine block 10 to receive an oil pump. The oil pump may be of any suitable design and is driven by the crankshaft through a drive belt or meshing gears. The oil pump communicates with the crankcase through a passage 14 which is of circular cross section and is drilled into the block after it has been cast. The method of forming the passage 14 places limits on its cross sectional area and also increases manufacturing cost by adding a drilling step to io the machining of the block.
In a block 20 embodying the invention and shown in Figures 3 and 4, the passage 24 that leads from the crankcase to the oil pump recess 22 is cast in situ and can therefore be of non-circular cross section and may follow an irregular but smooth path through the block to avoid on the one hand encroaching on any other element of the engine and on the other hand abrupt changes of direction.
A core 30 for use in a mold to cast the block of Figures 3 and 4 is shown in Figure 5. As can be seen from this drawing, the core 30 has an arm 34 that defines the shape of the passage 24 which extends from a cylindrical disc 32 that defines the shape of the pump recess 22.
It can thus be seen that the invention allows the oil supply passage to the oil pump to be formed by adding an extension to the core 30 of the mould, which not only enables the passage to be produced with less machining of the block but allows greater freedom in the sizing and routing of the passage.
4
Claims (4)
1. An engine block having an oil pump mounted thereon and an oil passage formed within the block leading from the crankcase end of the engine block to the oil pump, wherein the oil passage is cast in situ within the block.
2. An engine block as claimed in claim 1, wherein the oil passage leading to the oil pump is of non--.circular cross 10 section.
3. An engine block as claimed in claim 2, wherein the oil passage leading to the oil pump does not follow a straight line. 15
4. An engine block constructed substantially as herein described with reference to and as illustrated in Figures 3, 4 and 5 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9818684A GB2340882A (en) | 1998-08-28 | 1998-08-28 | Construction of oil passages in an I.C. engine block by casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9818684A GB2340882A (en) | 1998-08-28 | 1998-08-28 | Construction of oil passages in an I.C. engine block by casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9818684D0 GB9818684D0 (en) | 1998-10-21 |
| GB2340882A true GB2340882A (en) | 2000-03-01 |
Family
ID=10837915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9818684A Withdrawn GB2340882A (en) | 1998-08-28 | 1998-08-28 | Construction of oil passages in an I.C. engine block by casting |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2340882A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022076156A1 (en) * | 2020-10-09 | 2022-04-14 | Caterpillar Inc. | Internal combustion engine having cylinder block with cast-in oil pump inlet and outlet passages |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1543211A (en) * | 1975-05-29 | 1979-03-28 | Celli A | Internal combustion engines |
| EP0450067A1 (en) * | 1989-08-30 | 1991-10-09 | Kabushiki Kaisha Komatsu Seisakusho | Cylinder liner cooling system |
| GB2284858A (en) * | 1993-12-15 | 1995-06-21 | Kloeckner Humboldt Deutz Ag | I.c.engine crankcase |
| GB2284859A (en) * | 1993-12-15 | 1995-06-21 | Kloeckner Humboldt Deutz Ag | Oil cooled reciprocating piston i.c.engine |
-
1998
- 1998-08-28 GB GB9818684A patent/GB2340882A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1543211A (en) * | 1975-05-29 | 1979-03-28 | Celli A | Internal combustion engines |
| EP0450067A1 (en) * | 1989-08-30 | 1991-10-09 | Kabushiki Kaisha Komatsu Seisakusho | Cylinder liner cooling system |
| GB2284858A (en) * | 1993-12-15 | 1995-06-21 | Kloeckner Humboldt Deutz Ag | I.c.engine crankcase |
| GB2284859A (en) * | 1993-12-15 | 1995-06-21 | Kloeckner Humboldt Deutz Ag | Oil cooled reciprocating piston i.c.engine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022076156A1 (en) * | 2020-10-09 | 2022-04-14 | Caterpillar Inc. | Internal combustion engine having cylinder block with cast-in oil pump inlet and outlet passages |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9818684D0 (en) | 1998-10-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |