US20020035979A1 - Valve operating mechanism of an internal combustion engine - Google Patents
Valve operating mechanism of an internal combustion engine Download PDFInfo
- Publication number
- US20020035979A1 US20020035979A1 US10/004,464 US446401A US2002035979A1 US 20020035979 A1 US20020035979 A1 US 20020035979A1 US 446401 A US446401 A US 446401A US 2002035979 A1 US2002035979 A1 US 2002035979A1
- Authority
- US
- United States
- Prior art keywords
- valve
- cotters
- bore
- spring retainer
- valve spring
- 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.)
- Abandoned
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/10—Connecting springs to valve members
Definitions
- the present invention relates to a valve operating mechanism for a poppet valve of an internal combustion engine, said mechanism comprising a spring retainer made of light alloy such as Al alloy which is mounted to the poppet valve via steel cotters, thereby increasing load of falling the cotters out of the lower end of the spring retainer.
- FIG. 6 illustrates an example of a known valve operating mechanism of an internal combustion engine, in which an Al alloy valve spring retainer 23 which has a taper bore 22 and a spring-retaining flange 3 a is engaged with the upper end of a poppet valve 21 via a pair of steel cotters 24 .
- An annular bead 24 a of each of the cotters 24 is engaged in an annular groove 21 a of the poppet valve 22 so that the valve spring retainer 23 may not come out upwards.
- valve spring 25 is provided between the lower surface of the spring-retaining flange 23 a and a cylinder head (not shown, and the poppet valve 21 is always urged upwards by the valve spring retainer 23 .
- the numeral 26 denotes a rocker arm which is engageable on the upper end of the poppet valve 21 , and is moved up and down by a rotary cam (not shown) to open and close the poppet valve 21 .
- the cotters 22 and the valve spring retainer 23 are integrally secured to the poppet valve 21 by wedge-like engagement of the cotters 24 with the bore 22 .
- taper angle of the bore is decreased, and roughness of contact surface between the bore 22 and the cotters 24 is decreased to decrease frictional resistance, thereby strengthening wedge-like engagement.
- valve spring retainer 23 When the cotters 24 fall deeply, the lower end of the valve spring retainer 23 is liable to cause cracking and to be damaged,. so that the cotters 24 come out. To solve the problem, the valve spring retainer 23 or the lower portion thereof increases in external diameter to increase rigidity and load of the cotters 24 .
- valve spring retainer 23 becomes larger to increase its weight.
- Al alloy valve spring retainer made to lighten its weight it will not be advantageous.
- FIG. 1 is a perspective view of cotters employed in the first embodiment a valve operating mechanism of the present invention
- FIG. 2 is a central vertical sectional view of FIG. 1;
- FIG. 3 is a central vertical sectional front view which illustrates how to determine load by which cotters come out of a bore of a valve spring retainer
- FIG. 4 is a central vertical sectional front view of the second embodiment of a valve operating mechanism of the present invention.
- FIG. 5 is a central vertical sectional front view of the third embodiment of a valve operating mechanism of the present invention.
- FIG. 6 is a central vertical sectional front view of a conventional valve operating mechanism
- FIG. 7 is a central vertical sectional front view thereof in which cotters are fallen.
- FIG. 1 illustrates a pair of cotters 7 , 7 used in a valve operating mechanism according to the present invention which have outer rough surfaces 8 , 8 made by sand blasting.
- the surfaces 8 , 8 may comprise uneven surfaces which have a number of sharp protrusions using rigid broken grid having sharp corners and made of cast steel.
- FIG. 2 is a sectional view of the valve operating mechanism which includes the cotter 7 which is engaged in a taper bore 10 of an Al alloy valve spring retainer 9 , a bead 7 a thereof being engaged in an annular groove 1 a of a poppet valve 1 .
- the cotters 7 , 7 are prevented from falling, and preset load of the valve spring 5 decreases, not to decrease the maximum rotation number of surging. Cracking at the lower portion of the valve spring retainer 9 is prevented and the cotter 7 is not liable to come off.
- the flange 9 a of the valve spring retainer 9 is supported by a cylindrical jig 11 as shown in FIG. 3, and the poppet valve 1 is pressed at the upper end by a pressing rod 12 of a pressing machine such as a hydraulic cylinder.
- Load by which the cotters 7 , 7 are pressed out of the valve spring retainer 9 is determined.
- load is about 9kN
- load in the present invention is about 15kN which is equivalent to that a steel valve spring retainer.
- Increase in load of the cotter would avoid necessity of increase in external diameter of the lower end of the valve spring retainer 9 to increase rigidity, thereby providing miniaturization and lightening of the retainer 9
- the cotter 7 is engaged in the bore 10 by fitting the rough surface 8 into the inner circumferential surface of the bore 10 . Even if lubricating oil flows into the bore 10 during running of an engine, frictional force of the contact surface will not be decreased. Thus, if surging occurs in the valve spring 5 , the cotter 7 could not come out of the upper portion of the bore 10 .
- annular projection 13 is formed at the lower portion of a bore 10 of an Al alloy valve spring retainer 9 .
- annular beads 4 a , 4 a are engaged in an annular groove of a poppet valve 1 , the upper end of the annular projection 13 is positioned slightly lower than the lower end of the cotters 7 .
- the annular projection 13 provides high shear strength, pressing load of the cotters 7 to the bore 10 , and in ordinary operation, there is no possibility that the cotters 7 would be pressed downwards to break the annular projection 13 to go out of the bore.
- FIG. 5 is a sectional view of the third embodiment of the present invention in which a smaller diameter portion 14 is formed to have larger taper angle than that of a bore 10 , at a lower portion than the lower end of the cotters 7 .
- the cotters 7 are prevented from falling out, by the smaller diameter portion 14 .
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Automatic Assembly (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
To operate a poppet valve in an internal combustion engine, a valve operating mechanism comprises a valve spring retainer which has a taper bore, a pair of cotters which is inserted in the bore to support the poppet valve, and a valve spring between the valve spring retainer and a cylinder head. There is provided means for preventing the cotters from falling out the bore.
Description
- The present invention relates to a valve operating mechanism for a poppet valve of an internal combustion engine, said mechanism comprising a spring retainer made of light alloy such as Al alloy which is mounted to the poppet valve via steel cotters, thereby increasing load of falling the cotters out of the lower end of the spring retainer.
- FIG. 6 illustrates an example of a known valve operating mechanism of an internal combustion engine, in which an Al alloy
valve spring retainer 23 which has ataper bore 22 and a spring-retaining flange 3 a is engaged with the upper end of apoppet valve 21 via a pair ofsteel cotters 24. Anannular bead 24 a of each of thecotters 24 is engaged in anannular groove 21 a of thepoppet valve 22 so that thevalve spring retainer 23 may not come out upwards. - Between the lower surface of the spring-retaining
flange 23 a and a cylinder head (not shown), avalve spring 25 is provided, and thepoppet valve 21 is always urged upwards by thevalve spring retainer 23. - The
numeral 26 denotes a rocker arm which is engageable on the upper end of thepoppet valve 21, and is moved up and down by a rotary cam (not shown) to open and close thepoppet valve 21. In the valve operating mechanism, thecotters 22 and thevalve spring retainer 23 are integrally secured to thepoppet valve 21 by wedge-like engagement of thecotters 24 with thebore 22. To increase securing force, taper angle of the bore is decreased, and roughness of contact surface between thebore 22 and thecotters 24 is decreased to decrease frictional resistance, thereby strengthening wedge-like engagement. - However, in a valve operating mechanism which has a relatively low mechanical strength Al alloy
valve spring retainer 23, when thebore 22 is plastically deformed and expanded owing to increase in wedge-like engagement, thecotters 24 fall gradually owing to low frictional resistance of the contact surface between thebore 22 and thecotters 24. Thevalve spring retainer 23 moves up gradually, so that load to thevalve spring 25 is decreased to decrease the maximum rotation number of surging, so that engine performance is deteriorated. - When the
cotters 24 fall deeply, the lower end of thevalve spring retainer 23 is liable to cause cracking and to be damaged,. so that thecotters 24 come out. To solve the problem, thevalve spring retainer 23 or the lower portion thereof increases in external diameter to increase rigidity and load of thecotters 24. - However, the
valve spring retainer 23 becomes larger to increase its weight. For Al alloy valve spring retainer made to lighten its weight, it will not be advantageous. - In view of the disadvantages as above, it is an object of the present invention to provide a valve operating mechanism for a poppet valve of an internal combustion engine to prevent a pair of cotters from falling out of a bore of a valve spring retainer.
- The features and advantages of the invention will become more apparent from the following description with respect to embodiment as shown in appended drawings wherein:
- FIG. 1 is a perspective view of cotters employed in the first embodiment a valve operating mechanism of the present invention;
- FIG. 2 is a central vertical sectional view of FIG. 1;
- FIG. 3 is a central vertical sectional front view which illustrates how to determine load by which cotters come out of a bore of a valve spring retainer;
- FIG. 4 is a central vertical sectional front view of the second embodiment of a valve operating mechanism of the present invention;
- FIG. 5 is a central vertical sectional front view of the third embodiment of a valve operating mechanism of the present invention;
- FIG. 6 is a central vertical sectional front view of a conventional valve operating mechanism; and
- FIG. 7 is a central vertical sectional front view thereof in which cotters are fallen.
- The first embodiment of the present invention will be described. FIG. 1 illustrates a pair of
cotters - FIG. 2 is a sectional view of the valve operating mechanism which includes the
cotter 7 which is engaged in ataper bore 10 of an Al alloyvalve spring retainer 9, abead 7 a thereof being engaged in anannular groove 1 a of a poppet valve 1. - In the valve operating mechanism which includes the
cotter 7, load of a valve spring 5 is applied upwards to a spring-retainingflange 9 a of thevalve spring retainer 9, and thecotter 7 moves downwards in thebore 10. Then, the outer sharp protrusions of the rough surface 8 fits with the inner circumferential surface of thebore 10 to cause large frictional resistance. - The
cotters valve spring retainer 9 is prevented and thecotter 7 is not liable to come off. - The
flange 9 a of thevalve spring retainer 9 is supported by acylindrical jig 11 as shown in FIG. 3, and the poppet valve 1 is pressed at the upper end by apressing rod 12 of a pressing machine such as a hydraulic cylinder. - Load by which the
cotters valve spring retainer 9 is determined. In a conventional valve operating mechanism which includes cotters having flat outer circumferential surface, load is about 9kN, while load in the present invention is about 15kN which is equivalent to that a steel valve spring retainer. Increase in load of the cotter would avoid necessity of increase in external diameter of the lower end of thevalve spring retainer 9 to increase rigidity, thereby providing miniaturization and lightening of theretainer 9 - The
cotter 7 is engaged in thebore 10 by fitting the rough surface 8 into the inner circumferential surface of thebore 10. Even if lubricating oil flows into thebore 10 during running of an engine, frictional force of the contact surface will not be decreased. Thus, if surging occurs in the valve spring 5, thecotter 7 could not come out of the upper portion of thebore 10. - The second embodiment of the present invention will be described.
- In FIG. 4, an
annular projection 13 is formed at the lower portion of abore 10 of an Al alloyvalve spring retainer 9. When a pair ofsteel cotters bore 10 and annular beads 4 a,4 a are engaged in an annular groove of a poppet valve 1, the upper end of theannular projection 13 is positioned slightly lower than the lower end of thecotters 7. - In a valve operating mechanism which includes the
valve spring retainer 9, load of a valve spring 5 is applied upwards to a spring-retainingflange 9 a of thevalve spring retainer 9 repeatedly, and thecotters 7 slides relatively downwards. The lower end of thecotters 7 contacts theannular projection 13, thereby preventing further downward movement thereof. - Therefore, the
cotters 7 are prevented from falling out to decrease preset load of the valve spring 5, so that the maximum rotation number of surging is not decreased. - The
annular projection 13 provides high shear strength, pressing load of thecotters 7 to thebore 10, and in ordinary operation, there is no possibility that thecotters 7 would be pressed downwards to break theannular projection 13 to go out of the bore. - FIG. 5 is a sectional view of the third embodiment of the present invention in which a
smaller diameter portion 14 is formed to have larger taper angle than that of abore 10, at a lower portion than the lower end of thecotters 7. In the embodiment, thecotters 7 are prevented from falling out, by thesmaller diameter portion 14. - The foregoing relate to embodiments of the present invention. Various changes and modifications may be made by person skilled in the art without departing from the scope of claims wherein:
Claims (5)
1. A valve operating mechanism for a poppet valve of an internal combustion engine, said mechanism comprising:
a light alloy valve spring retainer which has a taper bore;
a pair of cotters which is engaged in the taper bore of the valve spring retainer, each of the cotters having a bead in an inner circumferential surface, said beads being engaged in an annular groove of an end of the poppet valve;
a valve spring provided between said valve spring retainer and a cylinder head, and
means for preventing the cotters from falling out of the bore of the valve spring retainer.
2. A valve operating mechanism as claimed in claim 1 wherein said means for preventing the cotters from falling out of the bore comprises an outer circumferential rough surface of the cotters to be engaged in an inner circumferential surface of the bore of the valve spring retainer.
3. A valve operating mechanism as claimed in claim 1 wherein said means for preventing the cotters from failing out of the bore comprises a smaller diameter portion at a lower end of the bore of the valve spring retainer.
4. A valve operating mechanism as claimed in claim 3 wherein the smaller diameter portion comprises an annular projection.
5. A valve operating mechanism as claimed in claim 3 wherein the smaller diameter portion comprises an inner circumferential surface tapered at an angle larger than the tapered surface of the bore.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/004,464 US20020035979A1 (en) | 2000-03-30 | 2001-11-01 | Valve operating mechanism of an internal combustion engine |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000094293A JP2001280108A (en) | 2000-03-30 | 2000-03-30 | Valve system for internal combustion engine |
JP2000-94293 | 2000-03-30 | ||
JP2000-127107 | 2000-04-27 | ||
JP2000127107A JP2001303914A (en) | 2000-04-27 | 2000-04-27 | Valve system for internal combustion engine |
US09/640,892 US6338325B1 (en) | 2000-03-30 | 2000-08-17 | Valve operating mechanism of an internal combustion engine |
US10/004,464 US20020035979A1 (en) | 2000-03-30 | 2001-11-01 | Valve operating mechanism of an internal combustion engine |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/640,892 Division US6338325B1 (en) | 2000-03-30 | 2000-08-17 | Valve operating mechanism of an internal combustion engine |
Publications (1)
Publication Number | Publication Date |
---|---|
US20020035979A1 true US20020035979A1 (en) | 2002-03-28 |
Family
ID=26588896
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/640,892 Expired - Fee Related US6338325B1 (en) | 2000-03-30 | 2000-08-17 | Valve operating mechanism of an internal combustion engine |
US10/004,464 Abandoned US20020035979A1 (en) | 2000-03-30 | 2001-11-01 | Valve operating mechanism of an internal combustion engine |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/640,892 Expired - Fee Related US6338325B1 (en) | 2000-03-30 | 2000-08-17 | Valve operating mechanism of an internal combustion engine |
Country Status (2)
Country | Link |
---|---|
US (2) | US6338325B1 (en) |
EP (1) | EP1138882A3 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110140327A1 (en) * | 2008-08-04 | 2011-06-16 | Hironobu Imaizumi | Spring retainer and spring system |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10141176A1 (en) * | 2001-08-22 | 2003-03-20 | Bosch Gmbh Robert | Detachable connection for coupling a gas exchange valve of an internal combustion engine to an actuator |
CN102410058A (en) * | 2011-10-09 | 2012-04-11 | 浙江春风动力股份有限公司 | Engine valve device |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4515346A (en) * | 1983-04-15 | 1985-05-07 | Crane Cams Incorporated | Valve spring retainer assembly |
JPS61136106A (en) | 1984-12-07 | 1986-06-24 | Fanuc Ltd | Information method of cubic arc |
DE3508549A1 (en) * | 1985-03-09 | 1986-09-11 | Daimler-Benz Ag, 7000 Stuttgart | VALVE SPRING PLATE LOCKING ASSEMBLY |
US4838218A (en) * | 1986-06-12 | 1989-06-13 | Ngk Spark Plug Co., Ltd. | Ceramic valve supporting structure in use for internal combustion engine |
JPS6352906A (en) | 1986-08-22 | 1988-03-07 | Takeda Kikai Seisakusho:Kk | Drilling control method for drilling machine for plate |
JPH0195502A (en) | 1987-10-08 | 1989-04-13 | Mitsui Mining & Smelting Co Ltd | Manufacture of magnetic powder for bond magnet |
JPH0694804B2 (en) * | 1988-02-01 | 1994-11-24 | トヨタ自動車株式会社 | Valve retainer for internal combustion engine valve system |
JPH0287909A (en) | 1988-09-26 | 1990-03-28 | Toshiba Corp | Housing base device |
DE4230022A1 (en) * | 1992-09-10 | 1994-03-17 | Leybold Ag | Gas leakage testing sniffer using helium@ - forms entrance to capillary tube leading to mass spectrometer as funnel shape, and specifies inlet dia. to be ten times greater than dia. of capillary, and angle between inlet and funnel between twenty and sixty degrees |
US5255640A (en) * | 1993-03-09 | 1993-10-26 | D.P.I. | Bi-plastic self-locking valve spring retainer |
JPH0861026A (en) | 1994-08-25 | 1996-03-05 | Fuji Oozx Inc | Engine valve spring retainer |
JPH09329008A (en) * | 1996-06-11 | 1997-12-22 | Fuji Oozx Inc | Valve spring retainer for internal combustion engine and working method therefor |
US5619961A (en) * | 1996-08-01 | 1997-04-15 | Ford Motor Company | Poppet valve retainer system for internal combustion engine |
-
2000
- 2000-08-17 US US09/640,892 patent/US6338325B1/en not_active Expired - Fee Related
- 2000-08-18 EP EP00402315A patent/EP1138882A3/en not_active Withdrawn
-
2001
- 2001-11-01 US US10/004,464 patent/US20020035979A1/en not_active Abandoned
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110140327A1 (en) * | 2008-08-04 | 2011-06-16 | Hironobu Imaizumi | Spring retainer and spring system |
US8297603B2 (en) * | 2008-08-04 | 2012-10-30 | Nhk Spring Co., Ltd. | Spring retainer and spring system |
Also Published As
Publication number | Publication date |
---|---|
US6338325B1 (en) | 2002-01-15 |
EP1138882A3 (en) | 2001-11-21 |
EP1138882A2 (en) | 2001-10-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |