US3882832A - Valve operating cam device for internal combustion engine - Google Patents

Valve operating cam device for internal combustion engine Download PDF

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Publication number
US3882832A
US3882832A US488917A US48891774A US3882832A US 3882832 A US3882832 A US 3882832A US 488917 A US488917 A US 488917A US 48891774 A US48891774 A US 48891774A US 3882832 A US3882832 A US 3882832A
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United States
Prior art keywords
cam
internal combustion
cam lobes
intake valve
combustion chamber
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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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US488917A
Inventor
Kiyoshi Ohsaki
Morio Takahashi
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Publication date
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Publication of US3882832A publication Critical patent/US3882832A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H53/00—Cams ; Non-rotary cams; or cam-followers, e.g. rollers for gearing mechanisms
    • F16H53/02—Single-track cams for single-revolution cycles; Camshafts with such cams
    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • 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
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2101—Cams

Definitions

  • VALVE OPERATING CAM DEVICE FOR INTERNAL COMBUSTION ENGINE Inventors: Kiyoshi Ohsaki, Toda; Morio Takahashi, Toyohashi. both of Japan Assignee: Hyundai Giken Kogyo Kabushiki Kaisha, Tokyo, Japan Filed: July 16, 1974 Appl. No.: 488,917
  • ABSTRACT Three cam lobes formed integrally with a rotary camshaft are employed for operating the valves of a threevalve internal combustion piston engine.
  • the center cam is made larger than one of the other cams in every radial direction to facilitate grinding of the external cam surfaces.
  • Three-valve internal combustion engines have an intake and exhaust valve for each of the main combustion chambers, and are provided with an intake valve for each of the auxiliary combustion chambers.
  • the valves are operated by means of a rotary camshaft having a separate cam lobe for operating each of said three valves.
  • the middle cam lobe is relatively narrow because it is used to operate the auxiliary intake valve which is much smaller than the other valves and requires smaller operating forces.
  • the three cam lobes are grouped together on the rotary camshaft, and the center cam lobe between the other two lobes is narrower in axial width and smaller in radial dimensions. Accordingly, a thin grinding wheel must be employed for grinding the outer surface of the central cam lobe in order to reach in between the two outside cam lobes which have greater radial dimensions.
  • the narrow grinding wheel is subject to undesirable breaking or chipping.
  • the radial dimensions of the central cam lobe are made larger than one of the outside cams in every angular position of the shaft. In this way, relatively wide grinding wheels may be employed for grinding the individual surfaces of all three cam lobes.
  • FIG. 1 is a side elevation showing a preferred form of this invention.
  • FlG. 2 is a sectional elevation.
  • FIG. 3 is a side elevation showing a conventional camshaft construction.
  • the outer cam lobes 2 and 3 are mounted on each side of the central cam lobe 4. All of these cam lobes are integrally formed on the rotary camshaft 1.
  • the radial dimensions of the middle cam lobe 4 are larger at every angular position of the shaft than the corresponding radial dimensions of the adjacent cam lobe 2.
  • the silhouette of the cam lobe 4 is larger than that of the cam lobe 2.
  • the outer cam lobes 6 and 7 each have greater radial dimensions than the middle cam lobe 8. Accordingly, a narrow grinding wheel 9 is required to grind the surface of the middle cam lobe 8 in order that it may reach in between the grinding wheels 10 and 11 and cam lobes 6 and 7 to grind the outer surface of the middle lobe 8. Such a narrow grinding wheel 9 is subject to undesirable chipping and breaking.
  • the relatively wide grinding wheels 12 and 13 may first be employed to grind the surfaces of the cam lobes 2 and 3, and then the grinding wheel 12 may be shifted axially to grind the outer surface of the middle cam lobe 4.
  • a rotary camshaft having three axially spaced cam lobes integrally formed thereon for actuating said three valves, respectively, one cam lobe being positioned between the other two cam lobes and having greater radial dimensions than one of the other cam lobes at every angular position of the shaft.
  • a rotary camshaft having three axially spaced cam lobes integrally formed thereon for actuating said three valves, respectively, one cam lobe being positioned between the other two cam lobes and having a silhouette larger than one of the other cam lobes at every angular position of the shaft.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

Three cam lobes formed integrally with a rotary camshaft are employed for operating the valves of a three-valve internal combustion piston engine. The center cam is made larger than one of the other cams in every radial direction to facilitate grinding of the external cam surfaces.

Description

United States Patent Ohsaki et al.
VALVE OPERATING CAM DEVICE FOR INTERNAL COMBUSTION ENGINE Inventors: Kiyoshi Ohsaki, Toda; Morio Takahashi, Toyohashi. both of Japan Assignee: Honda Giken Kogyo Kabushiki Kaisha, Tokyo, Japan Filed: July 16, 1974 Appl. No.: 488,917
Foreign Application Priority Data July 31, 1973 Japan 48-89872 US. Cl. 123/90.6; 74/567; l23/90.17 Int. Cl. F011 l/04 Field of Search 123/906, 90.17; 74/567 May 13, 1975 [56] References Cited UNITED STATES PATENTS 1,185.516 5/1916 MacViear 123/901) 2,209,496 7/1940 Watson 123/9116 3 045 657 7/1962 Sampietro 123/901: 3,139,870 7/1964 Sampietro 123/901;
Primary E.\'aminerManuel A. Antonakas Assistant Examiner-Daniel .1. O'Connor Attorney, Agent, or Firm-Lyon & Lyon [57] ABSTRACT Three cam lobes formed integrally with a rotary camshaft are employed for operating the valves of a threevalve internal combustion piston engine. The center cam is made larger than one of the other cams in every radial direction to facilitate grinding of the external cam surfaces.
2 Claims, 3 Drawing Figures PATENTEI] HAY I 3l975 1 VALVE OPERATING CAM DEVICE FOR INTERNAL COMBUSTION ENGINE Three-valve internal combustion engines have an intake and exhaust valve for each of the main combustion chambers, and are provided with an intake valve for each of the auxiliary combustion chambers. The valves are operated by means of a rotary camshaft having a separate cam lobe for operating each of said three valves. The middle cam lobe is relatively narrow because it is used to operate the auxiliary intake valve which is much smaller than the other valves and requires smaller operating forces. In conventional construction, the three cam lobes are grouped together on the rotary camshaft, and the center cam lobe between the other two lobes is narrower in axial width and smaller in radial dimensions. Accordingly, a thin grinding wheel must be employed for grinding the outer surface of the central cam lobe in order to reach in between the two outside cam lobes which have greater radial dimensions. The narrow grinding wheel is subject to undesirable breaking or chipping.
ln accordance with this invention the radial dimensions of the central cam lobe are made larger than one of the outside cams in every angular position of the shaft. In this way, relatively wide grinding wheels may be employed for grinding the individual surfaces of all three cam lobes.
In the drawings:
FIG. 1 is a side elevation showing a preferred form of this invention.
FlG. 2 is a sectional elevation.
FIG. 3 is a side elevation showing a conventional camshaft construction.
Referring to the drawings, the outer cam lobes 2 and 3 are mounted on each side of the central cam lobe 4. All of these cam lobes are integrally formed on the rotary camshaft 1. In accordance with this invention, the radial dimensions of the middle cam lobe 4 are larger at every angular position of the shaft than the corresponding radial dimensions of the adjacent cam lobe 2. Thus, as shown in FIG. 2, the silhouette of the cam lobe 4 is larger than that of the cam lobe 2.
In the conventional arrangement shown in FIG. 3, the outer cam lobes 6 and 7 each have greater radial dimensions than the middle cam lobe 8. Accordingly, a narrow grinding wheel 9 is required to grind the surface of the middle cam lobe 8 in order that it may reach in between the grinding wheels 10 and 11 and cam lobes 6 and 7 to grind the outer surface of the middle lobe 8. Such a narrow grinding wheel 9 is subject to undesirable chipping and breaking.
When the middle cam lobe 4 is larger than one of the cam lobes 2 or 3, as shown in FIGS. 1 and 2, the relatively wide grinding wheels 12 and 13 may first be employed to grind the surfaces of the cam lobes 2 and 3, and then the grinding wheel 12 may be shifted axially to grind the outer surface of the middle cam lobe 4.
Having fully described our invention, it is to be understood that we are not to be limited to the details herein set forth but that our invention is of the full scope of the appended claims.
We claim:
1. For use with an internal combustion piston engine having a main combustion chamber provided with a main intake valve and an exhaust valve, and having an auxiliary combustion chamber provided with an auxiliary intake valve, the improvement comprising: a rotary camshaft having three axially spaced cam lobes integrally formed thereon for actuating said three valves, respectively, one cam lobe being positioned between the other two cam lobes and having greater radial dimensions than one of the other cam lobes at every angular position of the shaft.
2. For use with an internal combustion piston engine having a main combustion chamber provided with a main intake valve and an exhaust valve, and having an auxiliary combustion chamber provided with an auxiliary intake valve, the improvement comprising: a rotary camshaft having three axially spaced cam lobes integrally formed thereon for actuating said three valves, respectively, one cam lobe being positioned between the other two cam lobes and having a silhouette larger than one of the other cam lobes at every angular position of the shaft.

Claims (2)

1. For use with an internal combustion piston engine having a main combustion chamber provided with a main intake valve and an exhaust valve, and having an auxiliary combustion chamber provided with an auxiliary intake valve, the improvement comprising: a rotary camshaft having three axially spaced cam lobes integrally formed thereon for actuating said three valves, respectively, one cam lobe being positioned between the other two cam lobes and having greater radial dimensions than one of the other cam lobes at every angular position of the shaft.
2. For use with an internal combustion piston engine having a main combustion chamber provided with a main intake valve and an exhaust valve, and having an auxiliary combustion chamber provided with an auxiliary intake valve, the improvement comprising: a rotary camshaft having three axially spaced cam lobes integrally formed thereon for actuating said three valves, respectively, one cam lobe being positioned between the other two cam lobes and having a silhouette larger than one of the other cam lobes at every angular position of the shaft.
US488917A 1973-07-31 1974-07-16 Valve operating cam device for internal combustion engine Expired - Lifetime US3882832A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1973089872U JPS5039607U (en) 1973-07-31 1973-07-31

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US3882832A true US3882832A (en) 1975-05-13

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US (1) US3882832A (en)
JP (1) JPS5039607U (en)
AR (1) AR200450A1 (en)
BE (1) BE818272A (en)
BR (1) BR7406255D0 (en)
CA (1) CA991038A (en)
CH (1) CH583372A5 (en)
DD (1) DD116889A5 (en)
ES (1) ES428768A1 (en)
FR (1) FR2239586B1 (en)
GB (1) GB1481804A (en)
IT (1) IT1018752B (en)
NL (1) NL160053C (en)
SE (1) SE417447B (en)
SU (1) SU691100A3 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4741301A (en) * 1986-11-28 1988-05-03 General Motors Corporation Engine valve train with inner and outer cam followers
US5020488A (en) * 1989-11-22 1991-06-04 Fuji Jukogyo Kabushiki Kaisha Valve mechanism for an internal combustion engine
US5398649A (en) * 1991-11-08 1995-03-21 Yamaha Hatsudoki Kabushiki Kaisha S.O.H.C. five valve engine
EP0968791A2 (en) * 1998-06-30 2000-01-05 Cummins Engine Company, Ltd. Method of manufacturing a camshaft
US6035821A (en) * 1997-07-03 2000-03-14 Yamaha Hatsudoki Kabushiki Kaisha Cam shaft for engine
WO2005090756A1 (en) * 2004-02-23 2005-09-29 Tyssenkrupp Automotive Ag Built multiple cam
EP2505795A1 (en) * 2009-11-25 2012-10-03 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Variable valve device of an internal combustion engine
US20160145047A1 (en) * 2013-07-05 2016-05-26 Mecatherm Transport device of the noria type

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4326484A (en) * 1979-10-26 1982-04-27 Cummins Engine Company, Inc. Floating tappet guide plate
DE4017239C2 (en) * 1990-05-29 1999-09-30 Deutz Ag Camshaft with several bearing discs and cams - which occupy space between bearing discs without leaving intervening gaps
CN109339892A (en) * 2018-11-28 2019-02-15 无锡凯奥动力机械有限公司 Single-cylinder air-cooled diesel engine camshaft

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1185516A (en) * 1916-05-30 Frank Macvicar Valve.
US2209496A (en) * 1939-02-15 1940-07-30 George Yates Automatic compression control for engines
US3045657A (en) * 1959-07-22 1962-07-24 Thompson Ramo Wooldridge Inc Valve operating means
US3139870A (en) * 1962-01-03 1964-07-07 Sampietro Achille Carlo Internal combustion engines with four valves

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1185516A (en) * 1916-05-30 Frank Macvicar Valve.
US2209496A (en) * 1939-02-15 1940-07-30 George Yates Automatic compression control for engines
US3045657A (en) * 1959-07-22 1962-07-24 Thompson Ramo Wooldridge Inc Valve operating means
US3139870A (en) * 1962-01-03 1964-07-07 Sampietro Achille Carlo Internal combustion engines with four valves

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4741301A (en) * 1986-11-28 1988-05-03 General Motors Corporation Engine valve train with inner and outer cam followers
US5020488A (en) * 1989-11-22 1991-06-04 Fuji Jukogyo Kabushiki Kaisha Valve mechanism for an internal combustion engine
US5398649A (en) * 1991-11-08 1995-03-21 Yamaha Hatsudoki Kabushiki Kaisha S.O.H.C. five valve engine
US6035821A (en) * 1997-07-03 2000-03-14 Yamaha Hatsudoki Kabushiki Kaisha Cam shaft for engine
EP0968791A2 (en) * 1998-06-30 2000-01-05 Cummins Engine Company, Ltd. Method of manufacturing a camshaft
EP0968791A3 (en) * 1998-06-30 2000-04-05 Cummins Engine Company, Ltd. Method of manufacturing a camshaft
WO2005090756A1 (en) * 2004-02-23 2005-09-29 Tyssenkrupp Automotive Ag Built multiple cam
US20070074685A1 (en) * 2004-02-23 2007-04-05 Thomas Walz Built multiple cam
US7305953B2 (en) 2004-02-23 2007-12-11 Thyssenkrupp Automotive Ag Built multiple cam
CN100436759C (en) * 2004-02-23 2008-11-26 泰森克鲁普普里斯塔技术中心股份公司 Built multiple cam
EP2505795A1 (en) * 2009-11-25 2012-10-03 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Variable valve device of an internal combustion engine
EP2505795A4 (en) * 2009-11-25 2013-04-24 Mitsubishi Motors Corp Variable valve device of an internal combustion engine
US20160145047A1 (en) * 2013-07-05 2016-05-26 Mecatherm Transport device of the noria type
US9511939B2 (en) * 2013-07-05 2016-12-06 Mecatherm Transport device of the noria type

Also Published As

Publication number Publication date
SU691100A3 (en) 1979-10-05
NL160053C (en) 1979-09-17
IT1018752B (en) 1977-10-20
BR7406255D0 (en) 1975-04-22
CH583372A5 (en) 1976-12-31
DE2436667B2 (en) 1976-03-11
DE2436667A1 (en) 1975-02-20
NL160053B (en) 1979-04-17
FR2239586B1 (en) 1978-02-17
AR200450A1 (en) 1974-11-08
CA991038A (en) 1976-06-15
ES428768A1 (en) 1976-11-16
GB1481804A (en) 1977-08-03
FR2239586A1 (en) 1975-02-28
SE417447B (en) 1981-03-16
SE7409834L (en) 1975-02-03
DD116889A5 (en) 1975-12-12
JPS5039607U (en) 1975-04-23
AU7119374A (en) 1976-01-15
NL7410226A (en) 1975-02-04
BE818272A (en) 1975-01-30

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