US3554171A - Cylinder head of an air-cooled internal combustion engine - Google Patents
Cylinder head of an air-cooled internal combustion engine Download PDFInfo
- Publication number
- US3554171A US3554171A US722611A US3554171DA US3554171A US 3554171 A US3554171 A US 3554171A US 722611 A US722611 A US 722611A US 3554171D A US3554171D A US 3554171DA US 3554171 A US3554171 A US 3554171A
- Authority
- US
- United States
- Prior art keywords
- cylinder head
- hollow space
- cooling
- head according
- channel
- 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.)
- Expired - Lifetime
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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
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F1/26—Cylinder heads having cooling means
- F02F1/28—Cylinder heads having cooling means for air cooling
- F02F1/30—Finned cylinder heads
- F02F1/32—Finned cylinder heads the cylinder heads being of overhead valve type
-
- 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
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
-
- 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
- F02F2001/249—Cylinder heads with flame plate, e.g. insert in the cylinder head used as a thermal insulation between cylinder head and combustion chamber
Definitions
- a cylinder head vof an air-cooled internal combustion engine which is provided with a pressure oil channel for the additional cooling of places in the cylinder head that are particularly subjected to thermal stresses; on the inside of the cylinder head the pressure oil channel passes over into a hollow space whereby cooling ribs are arranged at the inner walls of the hollow space.
- the present invention aims at intensively cooling bymeans of pressure oil the thermally maximal stressed area of the cylinder head, especially of high performance engines; This takes place according to the present invention in that'v the pressure oil'channel passesover into a hollow space arranged on the inside of the cylinder head, at the interior walls of which arearranged cooling ribs.
- a particularlyy effective heat transferor heat removal is achieved in accordance with the present invention in that the cooling ribs, starting from wall parts of the hollow space that are particularly heated up, intermesh or interengagewith one another in such a manner that in cooperation with a filler piece ⁇ protruding into the hollow space a meander-shaped guidance of the cooling oil streamresults.
- Another object of the present invention resides in a cylinder head of air-cooled internal combustion engines, especiallyfof high perforrnanceengine's in which the areas of the cylinder head that are subjected to maximum thermal stresses are effectively and intensively cooled.
- a further object of the present invention resides in a cylinder head of an air-cooled internalcombustion engine in which an efficacious heat removal is achieved by simple and relatively inexpensive means.
- Still another object of the present'invention resides in a cylinder headof an air-cooled intemal-combustion enginef which is simple in construction, easy to assemble and reliable in operation for the intended purposes.
- Still a further object of the present invention resides in a cylinder head for an air-cooled internal combustion engine which assures effective cooling without the need for any additional supply pump'or oil cooler other than those already necessitated for the lubricating circulatory system.
- a further object of the present invention resides in a cylinder head of an air-cooled internal combustion engine which is provided with an approximately meander-shaped pressure oil channel effectively avoiding dead spaces for the cooling oil.
- FIG. l is a partial cross-sectional view through an installed cylinder head of an air-cooled Dieseliengine in accordance with the present invention, taken alongline -l-lof FIG. 2;
- FIG. 2 is a partial cross-sectional view'through the cylinder covered by control housing 13 enclosing the conventional control devices, such as rocker arms. etc.
- a conventional seal is interposed between the cylinder head ll and the control housing 13.
- ⁇ Clampng or tightening bolts 16 starting from the control housing 13 extend through througlvbores 17 (FIG. 2) in the cylinder head 1l.and'are guided through corresponding apertures at the cylinder-l2 and connect these structural parts with the crankcase (not shown
- An inlet channel 18, an exhaustchannel 19 and a bore 20 for the accommodation of an injection nozzle (not shown) are arranged in the cylinder head 1l.
- Ribs 21', 22 and 23 extend from the cylinder head ll for the purpose of air-cooling.
- Through-bores 24 and apertures 25 for the pushrod protective tubes 26 are provided in the ribs 22.
- the first partial section 27 (FlG. l of a pressure oil channel terminates in a hollow space 28 and is continued in a further partial section 29 from which branches off at right angle in the .upward direction the partial section 30..
- a closure screw 32 closes the end of the partial section 29. Threaded connecting nipples 33 and 34 are disposed at the beginning of the partial section 27 of the channel and, at the end of the channel 31, respectively.
- the hollow space 28 is arranged in the cylinder head ll above the web between the inlet channel 418 and the exhaust channel 19.
- Cooling ribs 36 and 37 start from the bottom 35 (FIG. l) of the hollow space 28.
- the cooling ribs 36 extend in part from the lateral wall 38 up to the lateral wall 39 (FIG. 2) of the hollow space 28.
- the cooling ribs 37 are connected only with the lateral wall 39 and are constructed higher.
- a steppeddown or shoulderedoff tiller piece 4l; arranged at the bottom side 40 of the control housing 13, extends up to the upper edges of the cooling ribs 36 and 37 and closes off the hollow space 28 in the upward direction.
- the filler member 41 may, as shown in the drawing, be connected in one piece with the control housing 13 or may besecured at the same time, for example, by screws or bolts.
- the illustrated cooling oil circulatory system of the cylinder head l1 is connected in parallel to the conventional lubricating oil circulatory system (not shown) of the internal combastion engine.
- a separate supply pump and a further oil cooler can be saved as a result thereof.
- the supply line branching off from the lubricating oil circulatory system is connected with the connecting nipple 33 while the return line is connected to the connecting nipple 34.
- the pressure oil flows through the partial section 27 of the channel into the hollow space 28.
- Thecooling ribs 36 and 37 arranged transversely to the main flow direction.
- a cylinder head for an air-cooled internal combustion engine provided with air-cooling means and a pressure oil channel for the additional cooling of places in the cylinder head that are particularly subjected to thermal stresses, characterized in that during engine operation a pressurized oil stream flows through the pressure oil channel and passes over into a hollow space provided on the inside of the cylinder head, and cooling rib means are arranged at the inner walls forming said hollow space.
- a cylinder head according to claim l further comprising filler means extending into the hollow space, the cooling rib means so engaging with one another that in conjunction with said ller means an approximately meander-shaped guidance of the cooling oil stream results.
- cooling rib means stan from those wall parts that are particularly subjected to heat stresses.
- a cylinder head provided with a web between its inlet channel and its outlet channel according to claim 5, characterized in that said hollow space is arranged above said web.
- a cylinder head provided with a web between its inlet channel and its outlet channel according to claim l, characterized in that said hollow space is arranged above said web.
- a cylinder head according to claim l wherein the engine includes a lubricating circulatory system ⁇ and wherein said pressure oil channel is operatively' connected with said lubricating oil circulatory system.
- a cylinder head according to claim l. characterized in that said hollow space extends through the cylinder head only within the areas thereof subjected to very high thermal stresses.
- a cylinder head according to claim l characterized in that said chamber is limited to the area between the valve channels of the cylinder head.
- a cylinder head according to claim l characterized in that said oil channel is of relatively small cross section compared to the cross section of the cylinder head in a plane ex tending through said oil channel.
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)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
A cylinder head of an air-cooled internal combustion engine which is provided with a pressure oil channel for the additional cooling of places in the cylinder head that are particularly subjected to thermal stresses; on the inside of the cylinder head the pressure oil channel passes over into a hollow space whereby cooling ribs are arranged at the inner walls of the hollow space.
Description
States Patent [72] Inventors Otto Herschmann,
Schorndorf, A Josef Reisacher, fellbachlingoglgjsch, y Stuttgart-Rohracker, and Alfred Goetz,
Stuttgart, Germany [2l] Appl. No. 722,611
[22] `Filed Apr. 19, 1968 [45] li'atentedv Jan. l2, 1971 [73] Assignee Daimler-Benz Aktiengesellscha 1. Stuttgart-Unterturkheim, Germany [32] Priority Apr. 22, 1967 [33] Germany [3 l No. D52898 [54] CYLINDER-HEAD OFAN AIR-COOLED INTERNAL COMBUSTION ENGINE 13 Claims, 2 Drawing Figs. [52] U.S.`(`I .1 12B/41.42, l23/4l.55, l23/4l.57 [5l] Int. Cl Flllp 3/04,
.Primary Examiner-Mark Newman Attorney-Craig, Antonelli, Stewart & Hill ABSTRACT: A cylinder head vof an air-cooled internal combustion engine which is provided with a pressure oil channel for the additional cooling of places in the cylinder head that are particularly subjected to thermal stresses; on the inside of the cylinder head the pressure oil channel passes over into a hollow space whereby cooling ribs are arranged at the inner walls of the hollow space.
' 4PATENTED JAN T 2 Isn SHEET- 1: OT 2 TNVENTORS OTTO HERSCHMANN JOSEF REISACHER HENZ STOCKFISCH ALFRED OOTZ M ATTORNEYS PATENTEUJAmmn- 3.554171 snm e or 2 OTTO HERSCHMA f F REISACHER Z STOCKFISCH ALFRED GOTZ du? Z ATTORNEYS CYLINDER HEAD F AN AIR-COLED INTERNAL COMBUSTION ENGINE BACKGROUND Ol: THE INVENTION SUMMARY or THE INVENTION ln contradistinction thereto, the present invention aims at intensively cooling bymeans of pressure oil the thermally maximal stressed area of the cylinder head, especially of high performance engines; This takes place according to the present invention in that'v the pressure oil'channel passesover into a hollow space arranged on the inside of the cylinder head, at the interior walls of which arearranged cooling ribs.
A particularlyy effective heat transferor heat removal is achieved in accordance with the present invention in that the cooling ribs, starting from wall parts of the hollow space that are particularly heated up, intermesh or interengagewith one another in such a manner that in cooperation with a filler piece` protruding into the hollow space a meander-shaped guidance of the cooling oil streamresults.
Accordingly, itis an object of the present invention to pro vide a cylinder head `for an air-cooled internal combustion engine which avoids, by` simple means, 'the-shortcomings and drawbacks mentioned hereinabove and encountered in the prior artconstructions. v l
Another object of the present invention resides in a cylinder head of air-cooled internal combustion engines, especiallyfof high perforrnanceengine's in which the areas of the cylinder head that are subjected to maximum thermal stresses are effectively and intensively cooled. y n
A further object of the present invention resides in a cylinder head of an air-cooled internalcombustion engine in which an efficacious heat removal is achieved by simple and relatively inexpensive means.`
Still another object of the present'invention resides in a cylinder headof an air-cooled intemal-combustion enginef which is simple in construction, easy to assemble and reliable in operation for the intended purposes.
Still a further object of the present invention resides in a cylinder head for an air-cooled internal combustion engine which assures effective cooling without the need for any additional supply pump'or oil cooler other than those already necessitated for the lubricating circulatory system. j
A further object of the present invention resides in a cylinder head of an air-cooled internal combustion engine which is provided with an approximately meander-shaped pressure oil channel effectively avoiding dead spaces for the cooling oil. i v
These and further objects, features, and advantages of the presentinvention will become more obvious from the following description when taken in connection with the accompanying drawing which shows, for purposesof illustration only, one embodiment in accordance with the present invention, and wherein: 4
FIG. l is a partial cross-sectional view through an installed cylinder head of an air-cooled Dieseliengine in accordance with the present invention, taken alongline -l-lof FIG. 2; and
FIG. 2 is a partial cross-sectional view'through the cylinder covered by control housing 13 enclosing the conventional control devices, such as rocker arms. etc. A conventional seal is interposed between the cylinder head ll and the control housing 13.`Clampng or tightening bolts 16 starting from the control housing 13 extend through througlvbores 17 (FIG. 2) in the cylinder head 1l.and'are guided through corresponding apertures at the cylinder-l2 and connect these structural parts with the crankcase (not shown An inlet channel 18, an exhaustchannel 19 and a bore 20 for the accommodation of an injection nozzle (not shown) are arranged in the cylinder head 1l. Ribs 21', 22 and 23 extend from the cylinder head ll for the purpose of air-cooling. Through-bores 24 and apertures 25 for the pushrod protective tubes 26 are provided in the ribs 22.
The first partial section 27 (FlG. l of a pressure oil channel terminates in a hollow space 28 and is continued in a further partial section 29 from which branches off at right angle in the .upward direction the partial section 30..A channel 31 in the control housing 13 adjoins the `partial section 30. A closure screw 32 closes the end of the partial section 29. Threaded connecting nipples 33 and 34 are disposed at the beginning of the partial section 27 of the channel and, at the end of the channel 31, respectively.
The hollow space 28 is arranged in the cylinder head ll above the web between the inlet channel 418 and the exhaust channel 19. Cooling ribs 36 and 37 start from the bottom 35 (FIG. l) of the hollow space 28. The cooling ribs 36 extend in part from the lateral wall 38 up to the lateral wall 39 (FIG. 2) of the hollow space 28. The cooling ribs 37 are connected only with the lateral wall 39 and are constructed higher. A steppeddown or shoulderedoff tiller piece 4l; arranged at the bottom side 40 of the control housing 13, extends up to the upper edges of the cooling ribs 36 and 37 and closes off the hollow space 28 in the upward direction. The filler member 41 may, as shown in the drawing, be connected in one piece with the control housing 13 or may besecured at the same time, for example, by screws or bolts.
The illustrated cooling oil circulatory system of the cylinder head l1 is connected in parallel to the conventional lubricating oil circulatory system (not shown) of the internal combastion engine. A separate supply pump and a further oil cooler can be saved as a result thereof. The supply line branching off from the lubricating oil circulatory system is connected with the connecting nipple 33 while the return line is connected to the connecting nipple 34. During operation, the pressure oil flows through the partial section 27 of the channel into the hollow space 28. Thecooling ribs 36 and 37 arranged transversely to the main flow direction. together with the stepped filler piece 4lextendng up to the upper edges of the cooling ribs, impose upon the cooling oil stream a meander-shaped path both in a parallel plane to the bottom 35 of the hollow space 28 as-also in a parallelV plane to the lateral wall 39; Dead spaces, in which the cooling oil can collect and dam up, are avoided thereby. lt is possible in this manner to remove or carry o a .maximum amount of heat from the parts' of the cylinder head which are particularly subjected to thermal stresses, i.e., above all from the web between the inlet channel 18 and the outlet channel 19. After leaving the hollow space 28, the pressure oil flows through the partial sections 29 vin accordance with thepresent invention, it is understood that the same is not limited thereto but is susceptible of numerous changes and modifications asknown to a person skilledin the art.' For example, instead of one hollow space equipped with herein but intend to cover all such changes and modifications as are encompassed by the scope of the appended claims.
We claim:
l. A cylinder head for an air-cooled internal combustion engine provided with air-cooling means and a pressure oil channel for the additional cooling of places in the cylinder head that are particularly subjected to thermal stresses, characterized in that during engine operation a pressurized oil stream flows through the pressure oil channel and passes over into a hollow space provided on the inside of the cylinder head, and cooling rib means are arranged at the inner walls forming said hollow space.
2. A cylinder head according to claim l, further comprising filler means extending into the hollow space, the cooling rib means so engaging with one another that in conjunction with said ller means an approximately meander-shaped guidance of the cooling oil stream results.
3. A cylinder head according to claim 2, wherein said cooling rib means stan from those wall parts that are particularly subjected to heat stresses.
4. A cylinder head according to claim 3, wherein said cooling n`b means engage alternately with each other in such a manner that said meander-shaped guidance for the cooling oil stream results.
S. A cylinder head having a control housing mounted on the cylinder head according to claim 4, wherein said filler means is arranged at the bottom side of the control housing.
6. A cylinder head provided with a web between its inlet channel and its outlet channel according to claim 5, characterized in that said hollow space is arranged above said web.
7. A cylinder head according to claim 6, wherein the engine includes a lubricating circulatory system, and wherein said pressure oil channel is operatively connected with said lubricating oil circulatory system.
8. A cylinder head provided with a web between its inlet channel and its outlet channel according to claim l, characterized in that said hollow space is arranged above said web.
9. A cylinder head according to claim l, wherein the engine includes a lubricating circulatory system` and wherein said pressure oil channel is operatively' connected with said lubricating oil circulatory system.
l0. A cylinder head according to claim l. characterized in that said hollow space extends through the cylinder head only within the areas thereof subjected to very high thermal stresses.
ll. A cylinder head according to claim l0. characterized in that said hollow space extends through the cylinder head only within the area thereof disposed between its valve channels.
l2. A cylinder head according to claim l, characterized in that said chamber is limited to the area between the valve channels of the cylinder head.
13. A cylinder head according to claim l, characterized in that said oil channel is of relatively small cross section compared to the cross section of the cylinder head in a plane ex tending through said oil channel.
Claims (13)
1. A cylinder head for an air-cooled internal combustion engine provided with air-cooling means and a pressure oil channel for the additional cooling of places in the cylinder head that are particularly subjected to thermal stresses, characterized in that during engine operation a pressurized oil stream flows through the pressure oil channel and passes over into a hollow space provided on the inside of the cylinder head, and cooling rib means are arranged at the inner walls forming said hollow space.
2. A cylinder head according to claim 1, further comprising filler means extending into the hollow space, the cooling rib means so engaging with one another that in conjunction with said filler means an approximately meander-shaped guidance of the cooling oil stream results.
3. A cylinder head according to claim 2, wherein said cooling rib means start from those wall parts that are particularly subjected to heat stresses.
4. A cylinder head according to claim 3, wherein said cooling rib means engage alternately with each other in such a manner that said meander-shaped guidance for the cooling oil stream results.
5. A cylinder head having a control housing mounted on the cylinder head according to claim 4, wherein said filler means is arranged at the bottom side of the control housing.
6. A cylinder head provided with a web between its inlet channel and its outlet channel according to claim 5, characterized in that said hollow space is arranged above said web.
7. A cylinder head according to claim 6, wherein the engine includes a lubricating circulatory system, and wherein said pressure oil channel is operatively connected with said lubricating oil circulatory system.
8. A cylinder head provided with a web between its inlet channel and its outlet channel according to claim 1, characterized in that said hollow space is arranged above said web.
9. A cylinder head according to claim 1, wherein the engine includes a lubricating circulatory system, and wherein said pressure oil channel is operatively connected with said lubricating oil circulatory system.
10. A cylinder head according to claim 1, characterized in that said hollow space extends through the cylinder head only within the areas thereof subjected to very high thermal stresses.
11. A cylinder head according to claim 10, characterized in that said hollow space extends through the cylinder head only within the area thereof disposed between its valve channels.
12. A cylinder head according to claim 1, characterized in that sAid chamber is limited to the area between the valve channels of the cylinder head.
13. A cylinder head according to claim 1, characterized in that said oil channel is of relatively small cross section compared to the cross section of the cylinder head in a plane extending through said oil channel.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DED0052898 | 1967-04-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3554171A true US3554171A (en) | 1971-01-12 |
Family
ID=7054548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US722611A Expired - Lifetime US3554171A (en) | 1967-04-22 | 1968-04-19 | Cylinder head of an air-cooled internal combustion engine |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3554171A (en) |
| DE (1) | DE1576707A1 (en) |
| FR (1) | FR1564202A (en) |
| GB (1) | GB1172063A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2438193A1 (en) * | 1974-08-08 | 1976-02-26 | Tatra Np | Air cooled engine cooling system - uses lubricating oil for cooling hot parts of cylinder heads |
| US4131093A (en) * | 1973-06-21 | 1978-12-26 | National Research Development Corporation | Internal combustion engines |
| US4825816A (en) * | 1986-09-03 | 1989-05-02 | Kubota, Ltd. | Engine with forced air-cooling |
| US4986195A (en) * | 1988-09-28 | 1991-01-22 | Howe Furniture Corporation | Tilting table top mechanism |
| US20100043740A1 (en) * | 2008-08-19 | 2010-02-25 | Kool Kover, LLC | Valve cover housing for internal combustion engines |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3545333A1 (en) * | 1985-12-20 | 1987-07-02 | Kloeckner Humboldt Deutz Ag | CYLINDER HEAD |
| DE4342800C2 (en) * | 1993-12-15 | 1999-12-09 | Deutz Ag | Reciprocating internal combustion engine |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US877903A (en) * | 1905-12-04 | 1908-02-04 | Charley R Butler | Art of heat transference. |
| US1317750A (en) * | 1919-10-07 | Cobol b | ||
| US1384234A (en) * | 1920-04-29 | 1921-07-12 | Everett S Cameron | Oil-cooling system for explosive-engines |
| US1420684A (en) * | 1921-07-12 | 1922-06-27 | Bradshaw Granville | Cooling internal-combustion engines |
| US2213418A (en) * | 1939-10-07 | 1940-09-03 | Bernard A Swanson | Two-cycle combustion engine |
| US3456759A (en) * | 1965-04-07 | 1969-07-22 | Citroen Sa Andre | Devices for draining off oil from the valve cover and cooling the cylinder head of an internal combustion engine |
-
1967
- 1967-04-22 DE DE19671576707 patent/DE1576707A1/en active Pending
-
1968
- 1968-04-18 GB GB08328/68A patent/GB1172063A/en not_active Expired
- 1968-04-19 US US722611A patent/US3554171A/en not_active Expired - Lifetime
- 1968-04-22 FR FR1564202D patent/FR1564202A/fr not_active Expired
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1317750A (en) * | 1919-10-07 | Cobol b | ||
| US877903A (en) * | 1905-12-04 | 1908-02-04 | Charley R Butler | Art of heat transference. |
| US1384234A (en) * | 1920-04-29 | 1921-07-12 | Everett S Cameron | Oil-cooling system for explosive-engines |
| US1420684A (en) * | 1921-07-12 | 1922-06-27 | Bradshaw Granville | Cooling internal-combustion engines |
| US2213418A (en) * | 1939-10-07 | 1940-09-03 | Bernard A Swanson | Two-cycle combustion engine |
| US3456759A (en) * | 1965-04-07 | 1969-07-22 | Citroen Sa Andre | Devices for draining off oil from the valve cover and cooling the cylinder head of an internal combustion engine |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4131093A (en) * | 1973-06-21 | 1978-12-26 | National Research Development Corporation | Internal combustion engines |
| DE2438193A1 (en) * | 1974-08-08 | 1976-02-26 | Tatra Np | Air cooled engine cooling system - uses lubricating oil for cooling hot parts of cylinder heads |
| US4825816A (en) * | 1986-09-03 | 1989-05-02 | Kubota, Ltd. | Engine with forced air-cooling |
| US4986195A (en) * | 1988-09-28 | 1991-01-22 | Howe Furniture Corporation | Tilting table top mechanism |
| US20100043740A1 (en) * | 2008-08-19 | 2010-02-25 | Kool Kover, LLC | Valve cover housing for internal combustion engines |
| US8100100B2 (en) | 2008-08-19 | 2012-01-24 | Turner Jr Price George | Valve cover housing for internal combustion engines |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1576707A1 (en) | 1970-05-06 |
| GB1172063A (en) | 1969-11-26 |
| FR1564202A (en) | 1969-04-18 |
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