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US3185142A - Poppet valves of internal combustion engines - Google Patents

Poppet valves of internal combustion engines Download PDF

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Publication number
US3185142A
US3185142A US340396A US34039664A US3185142A US 3185142 A US3185142 A US 3185142A US 340396 A US340396 A US 340396A US 34039664 A US34039664 A US 34039664A US 3185142 A US3185142 A US 3185142A
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Prior art keywords
diameter
stem
valve
groove
head
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Expired - Lifetime
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US340396A
Inventor
Peras Lucien
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Renault SA
Regie Nationale des Usines Renault
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Renault SA
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    • 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

  • This invention relates to poppet valves of internal combustion engines and has specific reference to improvements in the design of these valves with a view to increase their mechanical strength and prevent their breakage.
  • Engine valves comprise as a rule a groove positioned near the end of the valve stem and adapted to receive the pair of tapered half rings (also called valve cotters) retaining the valve collar of substantially frusto-conical configuration on which the valve spring is caused to abut.
  • tapered half rings also called valve cotters
  • the groove formed in the valve stem reduces the strength of the valve and may become a source of incipient fracture, notably in the case of high-speed engines.
  • the improvements constituting the subject matter of this invention consist in reducing the diameter of the valve stem slightly beneath said groove, when the valve is observed with its head down, that is, between the cotter groove and the valve head, the length of said portion of reduced diameter being substantially greater than that of said groove; thus, an elasticity is imparted to the valve stem which is sufiicient to prevent the valve breakage across said groove.
  • FIGURE 1 shows a poppet valve incorporating the improvements constituting the subject-matter of this invention
  • FIGURE 2 shows a modified embodiment of the valve of this invention.
  • the valve illustrated comprises a head 1 and a stem 2 formed with a groove 3 for engagement by the valve cotters.
  • the normal diameter of the stem 2 is d.
  • the diameter d is reduced in the portion 4 to a value d slightly inferior or equal to the diameter d of the bottom of groove 3, this reduced portion 4 extending along an axial length l as long as permitted by the valve gear diagram in the valve stem guiding zone.
  • the portion with diameter d of stem 2 merges at its two ends into the portion of diameter d of stem 2 by means of a large-radius fillet R followed by a smallradius rounded edge r. It is essential that this reduction in diameter be obtained without leaving any trace of machine tool.
  • FIGURE 2 illustrates a modified form of embodiment wherein the stem diameter is still reduced in portion '4 along the length 1 but in this case this reducion in diameter, instead of being obtained by providing a cylindrical portion of reduced thickness along the valve stem as inthe preceding case, is obtained by giving a tapered configuration to this portion.
  • the stern clearance is of frustoconical configuration with its minor base adjacent to the groove 3 having a diameter d the major base of this stem clearance having the same diameter as the valve stem, as shown at d.
  • the minor base diameter d should be slightly inferior or equal to the diameter al measured in the bottom of groove 3, and the length l of the frustoconical portion should be as long as consistent with the valve gear diagram in the guided zone of the valve stem.
  • the clearance cone merges into the valve stem at its smaller end by means of a fillet having a relatively large radius R, followed by a rounded edge having a smaller a radius r.
  • a poppet valve comprising an elongated valve stem and a valve head at the lower end thereof, said stem having an annular groove located near the upper end of said stern and adapted to receive a valve cotter, a longitudinal portion of said stem between said groove and said head being reduced in diameter over a length greater than the height of said groove, said longitudinal portion of reduced diameter being of a frusto conical shape with the minor diameter being located at the upper part of said stem adjacent said groove and with the major diameter located at the lower part of said stern adjacent said head, the peripheral junction between said portion of reduced diameter and the normal diameter of the stem being defined by a fillet and a rounded portion, said fillet having a larger 1 diameter than said rounded portion.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lift Valve (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Description

May 25, 1965 PERAS 3,185,142
POPPET VALVES OF INTERNAL COMBUSTION ENGINES Filed Jan. 27. 1964 liven?)- Zu e1 e7; l r'as United States, Patent 3,185,142 POPPET VALVES OF INTERNAL COMBUSTHON ENGINE Lucien Pras, Billancourt, France, assignor to Regie Nationale des Usines Renault, Biliancourt, France Filed Ean. 27, 1964, Ser. No. 340,396 Claims priority, appiication France, Jan. 30, 1963, 923,192, Patent 1,354,983; Oct. 28, 1963, 952,004, Patent 84,593
3 Claims. (Cl. 123-188) This invention relates to poppet valves of internal combustion engines and has specific reference to improvements in the design of these valves with a view to increase their mechanical strength and prevent their breakage.
Engine valves comprise as a rule a groove positioned near the end of the valve stem and adapted to receive the pair of tapered half rings (also called valve cotters) retaining the valve collar of substantially frusto-conical configuration on which the valve spring is caused to abut.
The groove formed in the valve stem reduces the strength of the valve and may become a source of incipient fracture, notably in the case of high-speed engines.
The improvements constituting the subject matter of this invention consist in reducing the diameter of the valve stem slightly beneath said groove, when the valve is observed with its head down, that is, between the cotter groove and the valve head, the length of said portion of reduced diameter being substantially greater than that of said groove; thus, an elasticity is imparted to the valve stem which is sufiicient to prevent the valve breakage across said groove.
Referring to the attached drawing,
FIGURE 1 shows a poppet valve incorporating the improvements constituting the subject-matter of this invention, and
FIGURE 2 shows a modified embodiment of the valve of this invention.
In the drawing, the valve illustrated comprises a head 1 and a stem 2 formed with a groove 3 for engagement by the valve cotters. The normal diameter of the stem 2 is d. a
To prevent the stem from breaking in the region a-b, a'-b, the diameter d is reduced in the portion 4 to a value d slightly inferior or equal to the diameter d of the bottom of groove 3, this reduced portion 4 extending along an axial length l as long as permitted by the valve gear diagram in the valve stem guiding zone.
The portion with diameter d of stem 2 merges at its two ends into the portion of diameter d of stem 2 by means of a large-radius fillet R followed by a smallradius rounded edge r. It is essential that this reduction in diameter be obtained without leaving any trace of machine tool.
FIGURE 2 illustrates a modified form of embodiment wherein the stem diameter is still reduced in portion '4 along the length 1 but in this case this reducion in diameter, instead of being obtained by providing a cylindrical portion of reduced thickness along the valve stem as inthe preceding case, is obtained by giving a tapered configuration to this portion. Under these circumstances the stern clearance is of frustoconical configuration with its minor base adjacent to the groove 3 having a diameter d the major base of this stem clearance having the same diameter as the valve stem, as shown at d. The minor base diameter d should be slightly inferior or equal to the diameter al measured in the bottom of groove 3, and the length l of the frustoconical portion should be as long as consistent with the valve gear diagram in the guided zone of the valve stem.
The clearance cone merges into the valve stem at its smaller end by means of a fillet having a relatively large radius R, followed by a rounded edge having a smaller a radius r.
Of course, it would not constitute a departure from the present invention to bring minor changes in the practical embodiment thereof, provided that the basic principles of the invention which are set forth in the appended claims are adhered to.
I claim:
1. In a poppet valve comprising an elongated valve stem and a valve head at the lower end thereof, said stem having an annular groove located near the upper end of said stern and adapted to receive a valve cotter, a longitudinal portion of said stem between said groove and said head being reduced in diameter over a length greater than the height of said groove, said longitudinal portion of reduced diameter being of a frusto conical shape with the minor diameter being located at the upper part of said stem adjacent said groove and with the major diameter located at the lower part of said stern adjacent said head, the peripheral junction between said portion of reduced diameter and the normal diameter of the stem being defined by a fillet and a rounded portion, said fillet having a larger 1 diameter than said rounded portion.
2. The poppet valve of claim 1 wherein the said minor diameter is less than the diameter of said groove.
3. The poppet valve of claim 1 wherein the said minor diameter is equal to the diameter of said groove.
References Cited by the Examiner UNITED STATES PATENTS 1,020,535 3/12 Brenner.
1,144,653 6/15 Goodspeed "123-188 2,171,668 9/39 Oldham 251337 XR 2,221,657 11/40 Taylor 123188 XR 2,270,356 1/42 Taylor 123-188 FRED E. ENGELTHALER, Primary Examiner.

Claims (1)

1. IN A POPPET VALVE COMPRISING AN ELONGATED VALVE STEM AND A VALVE HEAD AT THE LOWER END THEREOF, SAID STEM HAVING AN ANNULAR GROOVE LOCATED NEAR THE UPPER END OF SAID STEM AND ADAPTED TO RECEIVE A VALVE COTTER, A LONGITUDINAL PORTION OF SAID STEM BETWEEN SAID GROOVE AND SAID HEAD BEING REDUCED IN DIAMETER OVER A LENGTH GREATER THAN THE HEIGHT OF SAID GROOVE, SAID LONGITUDINAL PORTION OF REDUCED DIAMETER BEING OF A FRUSTO CONICAL SHAPE WITH THE MINOR DIAMETER BEING LOCATED AT THE UPPER PART OF SAID STEM ADJACENT SAID GROOVE AND WITH THE MAJOR DIAMETER LOCATED AT THE LOWER PART OF SAID STEM ADJACENT SAID HEAD, THE PERIPHERAL JUNCTION BETWEEN SAID PORTION OF REDUCED DIAMETER AND THE NORMAL DIAMETER OF THE STEM BEING DEFINED BY A FILLET AND A ROUNDED PORTION, SAID FILLET HAVING A LARGER DIAMETER THAN SAID ROUNDED PORTION.
US340396A 1963-01-30 1964-01-27 Poppet valves of internal combustion engines Expired - Lifetime US3185142A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR923192A FR1354983A (en) 1963-01-30 1963-01-30 Development of internal combustion engine valves
FR952004A FR84593E (en) 1963-01-30 1963-10-28 Development of internal combustion engine valves

Publications (1)

Publication Number Publication Date
US3185142A true US3185142A (en) 1965-05-25

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US340396A Expired - Lifetime US3185142A (en) 1963-01-30 1964-01-27 Poppet valves of internal combustion engines

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US (1) US3185142A (en)
FR (2) FR1354983A (en)
GB (1) GB1017784A (en)
OA (1) OA01469A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3669407A (en) * 1967-11-20 1972-06-13 Weatherhead Co Valve stem
US4685653A (en) * 1984-12-18 1987-08-11 Wabco Westinghouse Fahrzeugbremsen Gmbh Valve assembly
US5619961A (en) * 1996-08-01 1997-04-15 Ford Motor Company Poppet valve retainer system for internal combustion engine
US20120138840A1 (en) * 2010-12-02 2012-06-07 Kia Motors Corporation Intake and exhaust valve for vehicle
US20130312694A1 (en) * 2012-05-23 2013-11-28 Aisan Kogyo Kabushiki Kaisha Intake engine valves
DE102019207536A1 (en) * 2019-05-23 2020-11-26 Mahle International Gmbh Gas exchange valve

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3142670C2 (en) * 1981-10-28 1983-09-29 Daimler-Benz Ag, 7000 Stuttgart Gas exchange valve for an internal combustion engine
US6125809A (en) * 1998-10-20 2000-10-03 Caterpillar Inc. Valve redesign for improved life

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1020535A (en) * 1911-05-26 1912-03-19 Lupu William Brenner Sectional valve for gas-engines.
US1144653A (en) * 1910-03-11 1915-06-29 Leland F Goodspeed Internal-combustion engine.
US2171668A (en) * 1938-02-21 1939-09-05 Leonard A Young Valve spring retainer
US2221657A (en) * 1938-02-04 1940-11-12 William H Taylor Method of making engine valves
US2270356A (en) * 1937-09-02 1942-01-20 William H Taylor Valve

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1144653A (en) * 1910-03-11 1915-06-29 Leland F Goodspeed Internal-combustion engine.
US1020535A (en) * 1911-05-26 1912-03-19 Lupu William Brenner Sectional valve for gas-engines.
US2270356A (en) * 1937-09-02 1942-01-20 William H Taylor Valve
US2221657A (en) * 1938-02-04 1940-11-12 William H Taylor Method of making engine valves
US2171668A (en) * 1938-02-21 1939-09-05 Leonard A Young Valve spring retainer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3669407A (en) * 1967-11-20 1972-06-13 Weatherhead Co Valve stem
US4685653A (en) * 1984-12-18 1987-08-11 Wabco Westinghouse Fahrzeugbremsen Gmbh Valve assembly
US5619961A (en) * 1996-08-01 1997-04-15 Ford Motor Company Poppet valve retainer system for internal combustion engine
US20120138840A1 (en) * 2010-12-02 2012-06-07 Kia Motors Corporation Intake and exhaust valve for vehicle
US20130312694A1 (en) * 2012-05-23 2013-11-28 Aisan Kogyo Kabushiki Kaisha Intake engine valves
DE102019207536A1 (en) * 2019-05-23 2020-11-26 Mahle International Gmbh Gas exchange valve

Also Published As

Publication number Publication date
FR1354983A (en) 1964-03-13
OA01469A (en) 1969-07-21
FR84593E (en) 1965-03-05
GB1017784A (en) 1966-01-19

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