US3884198A - Cam shafts for four cycle reversible internal combustion engines - Google Patents

Cam shafts for four cycle reversible internal combustion engines Download PDF

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Publication number
US3884198A
US3884198A US295905A US29590572A US3884198A US 3884198 A US3884198 A US 3884198A US 295905 A US295905 A US 295905A US 29590572 A US29590572 A US 29590572A US 3884198 A US3884198 A US 3884198A
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United States
Prior art keywords
cams
suction
cam shaft
actuating
cam
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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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US295905A
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English (en)
Inventor
Takashi Ito
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsui Engineering and Shipbuilding Co Ltd
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Mitsui Engineering and Shipbuilding Co Ltd
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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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/02—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for reversing
    • 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

Definitions

  • ABSTRACT In a cam shaft for actuating suction and exhaust valves of a four cycle reversible internal combustion engine of the class wherein the cam shaft is provided with a plurality of cams and the cam shaft is moved axially to select two cams for actuating suction and exhaust valve operating rods for effecting forward or reverse rotation of the engine, there are provided three spaced apart cams on the cam shaft, an intermediate cam of which serves as, for example, a cam for actuating the suction valve upon forward rotation and for actuating the exhaust valve upon reverse rotation, the spacing between adjacent two cams being made equal to the spacing between adjacent operating rods for suction and exhaust valves of the engine whereby the inclination angle of the inclined surfaces between the two adjacent cams can be reduced.
  • This invention relates to a cam shaft for actuating suction and exhaust valves ofa four cycle reversible internal combustion engine where a cam shaft makes one revolution every two revolutions of a crank shaft.
  • cam shaft for actuating suction and exhaust valves of a reversible internal combustion engine includes a pair of cams l and 2 for actuating operating rods 6 and 7 of exhaust and suction valves, not shown. for forward rotation and another pair of cams 1 and 2 for reverse rotation. Accordingly, when the cam shaft is moved axially for the purpose of reversing the direction of rotation of the engine, the length of the axial movement is very short so that the inclination angle 6 of the inclined surfaces of the cam shaft between adjacent cams which engage valve operating rods 6 and 7 is large thus requiring large force to move axially the cam shaft.
  • Another object of this invention is to provide an improved cam shaft capable of reducing the inclination angle of the inclined surfaces between adjacent cams so as to be moved axially with a small force for reversing the direction of rotation of the engine.
  • a cam shaft for actuating suction and exhaust valves of a reversible internal combustion engine of the class wherein the cam shaft is provided with a plurality of cams and the cam shaft is moved axially to select two cams for actuating suction and exhaust valve operating rods for effecting forward or reverse rotation of the engine, characterized in that there are provided three spaced apart cams on the cam shaft, an intermediate cam of which serves as, for example, a cam for actuating the suction valve upon forward rotation and for actuating the exhaust valve upon reverse rotation, the spacing between adjacent two cams being made equal to the spacing between adjacent operating rods for suction and exhaust valves of the engine whereby the inclination angle of the inclined surfaces between the two adjacent cams can be reduced.
  • FIG. 1 shows a diagrammatic side view of a cam shaft embodying the invention in the forward rotation position
  • FIG. 2 shows a view similar to FIG. 1 but showing the shaft in the reverse rotation position
  • FIG. 3 shows a diagrammatic side view of a prior art cam shaft in the forward rotation position
  • FIG. 4 shows a view similar to FIG. 3 but showing the shaft in the reverse rotation position
  • FIGS. 5 and 6 are diagrams to explain the forward and reverse rotation operations, respectively.
  • FIG. 1 shows a cam shaft 10 for actuating suction and exhaust valves (not shown) of a four cycle reversible internal combustion engine, the cam shaft 10 being shown in the position for forward rotation.
  • the cam shaft 10 is provided with cams 3, 4 and 5 for actuating the exhaust and suction valves through operating rods 6 and 7 and the cam shaft is disposed to be movable in the axial direction.
  • the rod 6 of exhaust valve engages the cam 3 and the rod 7 of suction valve the cam 4, thereby opening an exhaust valve and closing a suction valve.
  • FIG. 5 is a diagram showing the valve opening and closing intervals (crank angle) for forward rotation wherein curve 8 shows the valve opening interval of the exhaust valve and curve 9 that of the suction valve.
  • cam shaft 10 To reverse the direction of rotation of the engine cam shaft 10 is moved by a distance L in a direction designated at symbol B as shown in FIG. 1 so that intermediate cam 4 actuates the exhaust valve operating rod 6 whereas righthand cam 5 actuates the suction valve operating rod 7. Then, as shown in FIG. 6, the operating timings of the suction and exhaust valves are varied.
  • the cam shaft is provided with only three cams so that it is possible to increase the length B of the axial movement of the cam shaft over that of the prior design. Accordingly, it is possible to decrease the angle of inclination 0 of the inclined surface interconnecting adjacent cams, whereby the force necessary to move axially the cam shaft is decreased greatly.
  • since there is no exclusive cam for the reverse rotation between the valve operating rods it is possible to reduce the spacing L between these rods if the inclination angle 0 is allowed to be slightly larger. Further, as the number of cams for reverse rotation is decreased from two to one, the cam shaft can be manufactured at a less cost.
  • a cam shaft for actuating suction and exhaust valves comprising three spaced apart cams, an intermediate cam of which is disposed eccentrically with respect to the cams on opposite sides thereof and inclined surfaces are formed between said intermediate cam and the other two cams, said intermediate cam actuating the suction valve upon forward rotation and actuating the exhaust valve upon reverse rotation, the spacing between adjacent pairs of cams being equal to the spacing between said operating rods for adjacent suction and exhaust valves of said engine for reducing the inclination angle of said inclined surfaces between said adjacent pairs of cams.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)
US295905A 1971-10-09 1972-10-10 Cam shafts for four cycle reversible internal combustion engines Expired - Lifetime US3884198A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1971092966U JPS4848008U (OSRAM) 1971-10-09 1971-10-09

Publications (1)

Publication Number Publication Date
US3884198A true US3884198A (en) 1975-05-20

Family

ID=14069150

Family Applications (1)

Application Number Title Priority Date Filing Date
US295905A Expired - Lifetime US3884198A (en) 1971-10-09 1972-10-10 Cam shafts for four cycle reversible internal combustion engines

Country Status (6)

Country Link
US (1) US3884198A (OSRAM)
JP (1) JPS4848008U (OSRAM)
CH (1) CH542360A (OSRAM)
DE (1) DE2249017A1 (OSRAM)
FR (1) FR2155642A5 (OSRAM)
IT (1) IT968693B (OSRAM)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4353334A (en) * 1977-08-20 1982-10-12 Maschinenfabrik Augsburg-Nurnberg Aktiengesellschaft Method of and apparatus for starting an air-compressing four-stroke cycle internal combustion engine
US6099273A (en) * 1997-12-02 2000-08-08 Poclain Hydraulics Industrie Hydraulic motor with function selector
US7096838B1 (en) 2005-04-13 2006-08-29 Sexton Daniel W Reversible four cycle internal combustion engine
WO2017188877A1 (en) * 2016-04-28 2017-11-02 Scania Cv Ab A valve drive
CN110998090A (zh) * 2017-08-23 2020-04-10 罗伯特·博世有限公司 用于泵、尤其燃料高压泵的凸轮轴和具有凸轮轴的泵

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US992089A (en) * 1909-12-27 1911-05-09 Wesley A Phillips Valve mechanism.
US997253A (en) * 1908-04-08 1911-07-04 Knut Jonas Elias Hesselman Means for controlling revesible internal-combustion engines.
US1371286A (en) * 1918-04-11 1921-03-15 Winton Alexander Reversing mechanism
US1637117A (en) * 1923-05-29 1927-07-26 Kirchensteiner Johann Motor brake
US1950561A (en) * 1931-05-04 1934-03-13 Hugo Junkers Reversing gear for internal combustion engines
US2747557A (en) * 1953-11-09 1956-05-29 William J Silva Diesel engines
US2815010A (en) * 1955-03-01 1957-12-03 Miller Ralph Direct reversing engine, and method of operating it
US3019776A (en) * 1952-09-12 1962-02-06 Fairchild Stratos Corp Power plant

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US997253A (en) * 1908-04-08 1911-07-04 Knut Jonas Elias Hesselman Means for controlling revesible internal-combustion engines.
US992089A (en) * 1909-12-27 1911-05-09 Wesley A Phillips Valve mechanism.
US1371286A (en) * 1918-04-11 1921-03-15 Winton Alexander Reversing mechanism
US1637117A (en) * 1923-05-29 1927-07-26 Kirchensteiner Johann Motor brake
US1950561A (en) * 1931-05-04 1934-03-13 Hugo Junkers Reversing gear for internal combustion engines
US3019776A (en) * 1952-09-12 1962-02-06 Fairchild Stratos Corp Power plant
US2747557A (en) * 1953-11-09 1956-05-29 William J Silva Diesel engines
US2815010A (en) * 1955-03-01 1957-12-03 Miller Ralph Direct reversing engine, and method of operating it

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4353334A (en) * 1977-08-20 1982-10-12 Maschinenfabrik Augsburg-Nurnberg Aktiengesellschaft Method of and apparatus for starting an air-compressing four-stroke cycle internal combustion engine
US6099273A (en) * 1997-12-02 2000-08-08 Poclain Hydraulics Industrie Hydraulic motor with function selector
US7096838B1 (en) 2005-04-13 2006-08-29 Sexton Daniel W Reversible four cycle internal combustion engine
WO2017188877A1 (en) * 2016-04-28 2017-11-02 Scania Cv Ab A valve drive
US10774699B2 (en) 2016-04-28 2020-09-15 Scania Cv Ab Valve drive
CN110998090A (zh) * 2017-08-23 2020-04-10 罗伯特·博世有限公司 用于泵、尤其燃料高压泵的凸轮轴和具有凸轮轴的泵
CN110998090B (zh) * 2017-08-23 2023-03-28 罗伯特·博世有限公司 用于泵、尤其燃料高压泵的凸轮轴和具有凸轮轴的泵

Also Published As

Publication number Publication date
DE2249017A1 (de) 1973-04-19
FR2155642A5 (OSRAM) 1973-05-18
JPS4848008U (OSRAM) 1973-06-23
IT968693B (it) 1974-03-20
CH542360A (de) 1973-09-30

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