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
  • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
  • F01L1/20—Adjusting or compensating clearance
  • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
  • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
• • 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
  • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
  • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
• • 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
  • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
  • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
  • F01L9/21—Valve-gear or valve arrangements actuated non-mechanically by electric means actuated by solenoids
  • F01L2009/2125—Shaft and armature construction
• • 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
  • F01L2309/00—Self-contained lash adjusters

Definitions

• the present invention generally relates to an electromagnetically driven valve, and more particularly to an electromagnetically driven valve of a rotary drive type used in an internal combustion engine and driven by electromagnetic force and elastic force.
• Japanese Patent Laying-Open No. 11-30113 discloses an electromagnetically driven apparatus aiming at prevention of generation of sound caused by friction or impact at the time of opening/closing of an intake/exhaust valve as well as attaining improvement in its characteristic of being mounted on an engine.
• the electromagnetically driven apparatus disclosed in this publication includes an armature accommodated in a casing in a vertically movable manner, a valve-closing electromagnet and a valve-opening electromagnet fixed to positions above and below the armature respectively, and a valve-opening side spring moving an intake valve toward a valve-opening direction through the armature.
• the electromagnetically driven apparatus structured as above is called a parallel drive type, in which electromagnetic force generated by the valve-closing electromagnet and the valve-opening electromagnet and elastic force by the valve-opening side spring directly act on a main shaft integrally formed with the armature, thereby causing the main shaft to carry out reciprocating motion.
• Japanese Patent Laying-Open No. 11-107723 discloses an electromagnetically driven valve aiming to realize excellent silence and power-saving capability.
• the electromagnetically driven valve disclosed in this publication is also of a parallel drive type, similar to the electromagnetically driven apparatus disclosed in Japanese Patent Laying-Open No. 11-30113 mentioned above.
• an object of the present invention is to provide an electromagnetically driven valve attaining smooth reciprocating motion of the driven valve.
• the buffer member is guided by the guide member along the prescribed direction. Accordingly, while movement of the buffer member in the direction orthogonal to the prescribed direction is restricted, displacement of the valve shaft produced in the orthogonal direction can be accommodated. At the same time, the buffer member contracts and expands in the prescribed direction, so that registration error of the valve element caused by a difference from the valve shaft in thermal expansion or part assembly error can be accommodated. Therefore, according to the present invention, smooth reciprocating motion of the driven valve can be achieved while sufficient sealing of the intake/exhaust port by means of the valve element is ensured.
• the valve shaft has a first shaft portion located on a side where one end is coupled with respect to the buffer member and a second shaft portion located on a side of the valve element with respect to the buffer member.
• the first shaft portion includes a first end surface abutting on a surface of the buffer member. The first end surface makes sliding movement with respect to the surface of the buffer member, so that displacement of the valve shaft produced in the direction orthogonal to the prescribed direction is accommodated.
• displacement of the valve shaft produced in the direction orthogonal to the prescribed direction can be accommodated by using a simplified structure.
• the second shaft portion includes a second end surface connected to a surface of the buffer member, and the first shaft portion is formed such that the first end surface has an area larger than that of the second end surface.
• a contact area between the first end surface and the surface of the buffer member is increased, so that slide resistance produced therebetween can be made smaller. Therefore, displacement of the valve shaft produced in the direction orthogonal to the prescribed direction can smoothly be accommodated, while suppressing abrasion of the surface of the buffer member.
• an electromagnetically driven valve attaining smooth reciprocating motion of the driven valve can be provided.
• Fig. 1 is a cross-sectional view showing an electromagnetically driven valve according to a first embodiment of the present invention.
• Fig. 2 is a perspective view showing an electromagnet in Fig. 1.
• Fig. 3 is a perspective view showing a lower disc (an upper disc) in Fig. 1.
• Fig. 4 is a schematic diagram showing the upper disc and the lower disc at an oscillation end on a valve-opening side.
• Fig. 5 is a schematic diagram showing the upper disc and the lower disc at an intermediate position.
• Fig. 6 is a schematic diagram showing the upper disc and the lower disc at an oscillation end on a valve-closing side.
• Fig. 7 is a schematic diagram showing movement of the electromagnetically driven valve in Fig. 1.
• Fig. 9 is a cross-sectional view showing an electromagnetically driven valve according to a second embodiment of the present invention.
• Fig. 10 is a cross-sectional view showing an electromagnetically driven valve according to a third embodiment of the present invention.
• the electromagnetically driven valve implements an engine valve (an intake valve or an exhaust valve) in an internal combustion engine such as a gasoline engine or a diesel engine.
• an engine valve an intake valve or an exhaust valve
• an exhaust valve an exhaust valve
• an electromagnetically driven valve 10 is a rotary drive type electromagnetically driven valve. As an operation mechanism for the electromagnetically driven valve, a parallel link mechanism is applied.
• Electromagnetically driven valve 10 includes a driven valve 14 having a stem 12 extending in one direction and an umbrella-shaped portion 13 formed at a tip end of stem 12, and a lower disc 20 and an upper disc 30 coupled to different positions on stem 12 and oscillating by receiving electromagnetic force and elastic force applied thereto.
• Stem 12 is constituted of an upper stem 18 coupled to lower disc 20 and upper disc 30 and a lower stem 19 continuing from umbrella-shaped portion 13.
• Electromagnetically driven valve 10 further includes a lash adjuster 16 disposed between upper stem 18 and lower stem 19, and a guide ring 45 disposed on an outer circumference of lash adjuster 16 and guiding lash adjuster 16 along the direction in which stem 12 extends.
• Driven valve 14 carries out reciprocating motion in the direction in which stem 12 extends (a direction shown with an arrow 103), upon receiving the oscillating movement of lower disc 20 and upper disc 30.
• Driven valve 14 is mounted on a cylinder head 41 having an intake port 17 formed.
• a valve seat 42 is provided in a position where intake port 17 of cylinder head
• valve seat 42 or to move away from valve seat 42, so as to open or close intake port 17.
• driven valve 14 when stem 12 is elevated, driven valve 14 is positioned at a valve-closing position. On the other hand, when stem 12 is lowered, driven valve 14 is positioned at a valve-opening position.
• valve guide 43 for slidably guiding lower stem 19 in an axial direction is provided.
• Valve guide 43 is formed from a metal material such as stainless steel, in order to endure high-speed slide movement with respect to lower stem 19.
• a collar-shaped lower retainer 8 is fixed to an outer circumferential surface of lower stem 19, at a position apart from valve guide 43.
• a hollow portion 9 opening toward a top surface side is formed in cylinder head 41.
• Hollow portion 9 houses a lower spring 11 between a bottom surface of hollow portion 9 and lower retainer 8. Lower spring 11 applies the elastic force to driven valve 14 in such a direction that lower retainer 8 moves away from the bottom surface of hollow portion 9, that is, in a direction elevating lower stem 19.
• Lash adjuster 16 is constituted of an upper lid and a lower lid arranged with a prescribed gap therebetween and a viscous member filling the gap between the upper lid and the lower lid, such as grease or oil. With such a structure, lash adjuster 16 can freely expand and contract in the direction in which stem 12 extends. Lash adjuster 16 is shaped like a column, and includes a top surface 16a and a bottom surface 16b facing upper stem 18 and lower stem 19 respectively and a slide surface 16c extending between top surface 16a and bottom surface 16b.
• a tip end of lower stem 19 opposite to the tip end where umbrella-shaped portion 13 is formed is connected to bottom surface 16b of lash adjuster 16. That is, umbrella-shaped portion 13 and lash adjuster 16 are provided at opposing ends of lower stem 19, and lower retainer 8 is fixed at a position therebetween.
• Upper stem 18 has an end surface 18a facing top surface 16a.
• Upper stem 18 is provided, with respect to lash adjuster 16, in such a manner that end surface 18a abuts on top surface 16a.
• Slide surface 16c of lash adjuster 16 extends, with a distance from the outer circumferential surface of upper stem 18 and lower stem 19 in a radial direction. That is, lash adjuster 16 has a diameter larger than that of upper stem 18 and lower stem 19.
• Guide ring 45 has an annular shape, and has a guide surface 45c extending along an inner circumference. Guide surface 45c and slide surface 16c of lash adjuster 16 face and slidably contact with each other.
• a coupling pin 12p protruding from the outer circumferential surface and a coupling pin 12q protruding from the outer circumferential surface at a position apart from coupling pin 12p are formed.
• valve-closing permanent magnet 56 has an attraction and contact surface 56a, and a space in which upper disc 30 oscillates is defined between attraction and contact surface 56a and attraction and contact surface 61a of electromagnet 60.
• lower disc 20 has one end 22 and the other end 23, and extends from the other end 23 to one end 22 in a direction intersecting stem 12.
• Lower disc 20 is constituted of an arm portion 21 having rectangular surfaces 21a and 21b formed and extending between one end 22 and the other end 23, and a shaft- receiving portion 28 having a hollow cylindrical shape and provided at the other end 23.
• Surfaces 21a and 21b face attraction and contact surface 61b of electromagnet 60 and attraction and contact surface 55a of valve-opening permanent magnet 55, respectively.
• FIG. 10 is an enlarged view of a region of the electromagnetically driven valve where the lash adjuster is provided.
• lash adjuster 16 is constituted of an upper lid 81 having top surface 16a, a lower lid 83 arranged with a prescribed distance from upper lid 81 and having bottom surface 16b, and a viscous member 82 filling a gap between upper Hd 81 and lower lid 83, such as grease and oil.
• lower retainer 8 in Fig. 1 is not provided in lower stem 19.
• Lower spring 11 is housed in hollow portion 9 between the bottom surface of hollow portion 9 and lower lid 83.
• lash adjuster 16 serving as the buffer member includes upper lid 81 abutting on upper stem 18 serving as the first shaft portion, lower lid 83 connected to lower stem 19 serving as the second shaft portion and arranged at a position distant from upper lid 81, and viscous member 82 filling the gap between upper lid 81 and lower lid 83.
• the electromagnetically driven valve further includes lower spring 11 serving as the spring member, which is provided on a side opposite to viscous member 82, with either upper lid 81 or lower lid 83 being interposed, and applies elastic force to stem 12 serving as the valve shaft.
• Lower spring 11 serving as the spring member moves either upper lid 81 or lower lid 83.
• the electromagnetically driven valve in the third embodiment of the present invention structured as above, an effect similar to that in the first embodiment can be obtained.
• lash adjuster 16 is formed integrally with lower retainer 8, whereby the number of parts of the electromagnetically driven valve can be reduced.
• the first to third embodiments have described an example adopting a parallel link mechanism in an electromagnetically driven valve of a rotary drive type, however, the present invention is not limited thereto.
• the present invention is applicable to an electromagnetically driven valve including one disc having one end coupled to stem 12 and the other end supported by disc support base 51 so as to allow free oscillation of the disc and a plurality of electromagnets arranged above and below the disc and alternately applying electromagnetic force to the disc, in a manner similar to the first to third embodiments.
• the present invention is mainly utilized as an intake valve or an exhaust valve in a gasoline engine, a diesel engine, or the like.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Valve Device For Special Equipments (AREA)
• Magnetically Actuated Valves (AREA)
• Mechanically-Actuated Valves (AREA)

Applications Claiming Priority (2)

Publications (2)

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ID=34970941

Family Applications (1)

Country Status (6)

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Family Cites Families (14)

• 2004
  • 2004-09-01 JP JP2004254193A patent/JP2006070968A/ja not_active Withdrawn
• 2005
  • 2005-06-20 EP EP05753433A patent/EP1784559B1/de not_active Expired - Fee Related
  • 2005-06-20 US US11/632,660 patent/US20070252099A1/en not_active Abandoned
  • 2005-06-20 WO PCT/JP2005/011687 patent/WO2006025146A1/en active IP Right Grant
  • 2005-06-20 CN CNA2005800293425A patent/CN101010494A/zh active Pending
  • 2005-06-20 DE DE602005004927T patent/DE602005004927T2/de active Active

Non-Patent Citations (1)

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