EP2557280A1 - Actionneur de soupape pour moteur à combustion interne - Google Patents

Actionneur de soupape pour moteur à combustion interne Download PDF

Info

Publication number
EP2557280A1
EP2557280A1 EP10849438A EP10849438A EP2557280A1 EP 2557280 A1 EP2557280 A1 EP 2557280A1 EP 10849438 A EP10849438 A EP 10849438A EP 10849438 A EP10849438 A EP 10849438A EP 2557280 A1 EP2557280 A1 EP 2557280A1
Authority
EP
European Patent Office
Prior art keywords
rocker arm
combustion engine
internal combustion
urging means
valve operating
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.)
Withdrawn
Application number
EP10849438A
Other languages
German (de)
English (en)
Other versions
EP2557280A4 (fr
Inventor
Akihiko Kawata
Akio Kidooka
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.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
Publication of EP2557280A1 publication Critical patent/EP2557280A1/fr
Publication of EP2557280A4 publication Critical patent/EP2557280A4/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • F01L1/26—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
    • F01L1/267—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 with means for varying the timing or the lift of the valves
    • 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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/185—Overhead end-pivot rocking arms
    • 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
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • 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
    • F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
    • F01L2001/467—Lost motion springs
    • 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
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F01L2013/0052—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction with cams provided on an axially slidable sleeve
    • 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
    • F01L2305/00—Valve arrangements comprising rollers
    • 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
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/03—Auxiliary actuators
    • F01L2820/031—Electromagnets

Definitions

  • the present invention relates to a valve operating apparatus for an internal combustion engine.
  • a conventional valve operating apparatus for an internal combustion engine is disclosed in, for example, Patent Document 1.
  • the aforementioned conventional valve operating apparatus includes a lost motion mechanism that urges a rocker arm in one direction. More specifically, a cylinder head in which the aforementioned valve operating apparatus is mounted includes a boss portion that is formed by casting around a spark plug insertion cylinder (spark plug tube). The aforementioned lost motion mechanism is supported by the boss portion.
  • the applicants are aware of the following documents, which includes the above described document, as documents related to the present invention.
  • boss portion for supporting urging means such as a lost motion mechanism by casting on a top face of a cylinder head as in the above described conventional technique
  • urging means such as a lost motion mechanism
  • the present invention has been conceived to solve the above described problem, and an object of the present invention is to provide a valve operating apparatus for an internal combustion engine that, with respect to a configuration including urging means that urges a transfer member that transfers an acting force of a cam to a valve, can facilitate manufacture of a support portion of the urging means and suppress an increase in the mass of the internal combustion engine.
  • a first aspect of the present invention is a valve operating apparatus for an internal combustion engine, comprising:
  • a second aspect of the present invention is the valve operating apparatus for an internal combustion engine according to the first aspect of the present invention, wherein the transfer member includes a first rocker arm that rocks in synchrony with rotation of the cam, and wherein the urging means is means that urges the first rocker arm towards the cam.
  • a third aspect of the present invention is the valve operating apparatus for an internal combustion engine according to the second aspect of the present invention, wherein the holding member is attached to the spark plug tube in a condition in which the holding member is rotatable in a circumferential direction of the spark plug tube, wherein the valve operating apparatus for an internal combustion engine further comprising:
  • a fourth aspect of the present invention is the valve operating apparatus for an internal combustion engine according to the second or third aspect of the present invention, wherein the transfer member further includes a second rocker arm that is capable of pushing and moving the valve, wherein the valve operating apparatus for an internal combustion engine further comprises a switching mechanism capable of switching between a connected state in which the first rocker arm and the second rocker arm are in connection and a non-connected state in which the connection is released, and wherein the urging means is a lost motion mechanism that urges the first rocker arm so as to maintain a state in which the first rocker arm contacts the cam.
  • a fifth aspect of the present invention is the valve operating apparatus for an internal combustion engine according to the first or second aspect of the present invention, wherein the urging means is a lash adjuster that has a function of expanding and contracting so as to make a tappet clearance zero and that is disposed so as to support a fulcrum of the transfer member.
  • the urging means is a lash adjuster that has a function of expanding and contracting so as to make a tappet clearance zero and that is disposed so as to support a fulcrum of the transfer member.
  • a sixth aspect of the present invention is the valve operating apparatus for an internal combustion engine according to any one of the first to fifth aspects of the present invention, wherein the holding member includes a holding portion that covers a trunk portion of the urging means from outside, and an attachment portion that is attached to the spark plug tube.
  • a seventh aspect of the present invention is the valve operating apparatus for an internal combustion engine according to the sixth aspect of the present invention, wherein a cross-sectional shape of the holding portion is an enlarged shape of a cross-sectional shape of the urging means.
  • An eighth aspect of the present invention is the valve operating apparatus for an internal combustion engine according to any one of the first to seventh aspects of the present invention, wherein an end portion on an opposite side to an end portion that contacts the transfer member in the urging means is received and stopped by a base member to which the spark plug tube is fixed.
  • the necessity to form a support portion of the urging means by casting on a top face of a base member such as a cylinder head on which the valve operating apparatus is mounted is eliminated.
  • a boss portion (support portion) that includes excess thickness is not required, and hence manufacture of the aforementioned support portion can be facilitated and the mass of the internal combustion engine can be reduced. It is thereby possible to prevent a deterioration in the fuel consumption performance of a vehicle that is caused by an increase in the mass thereof.
  • the transfer member including the first rocker arm that rocks in synchrony with the cam, and that is equipped with the urging means that urges the first rocker arm toward the cam
  • manufacture of a support portion of the urging means can be facilitated and the mass of the internal combustion engine can be reduced.
  • the third aspect of the present invention it is possible to accurately perform positioning of the urging means with respect to the first rocker arm without leading to an increase in the number of components.
  • the urging means is configured as the lost motion mechanism that urges the first rocker arm toward the cam
  • the urging means is configured as the lash adjuster that supports a fulcrum of the transfer member
  • the sixth aspect of the present invention in the case of a configuration equipped with the holding member including the aforementioned holding portion and the aforementioned attachment portion, manufacture of a support portion of the urging means can be facilitated and the mass of the internal combustion engine can be reduced.
  • the weight of the holding member can be reduced.
  • the holding member carries out only a guiding function that guides the urging means, and the base member is responsible for bearing an urging force of the urging means.
  • a valve operating apparatus for an internal combustion engine according to Embodiment 1 of the present invention is configured as a variable valve operating apparatus that is capable of switching an operating state of a valve between a valve operating state and a closed-valve stopped state.
  • Figure 1 is a perspective view that illustrates the configuration of a variable valve operating apparatus 10 according to Embodiment 1 of the present invention.
  • Figure 2 shows partial cross-sectional views that illustrate the configuration of the variable valve operating apparatus 10 shown in Figure 1 . More specifically, Figure 1 illustrates the configuration of the variable valve operating apparatus 10 with respect to a certain cylinder of the internal combustion engine.
  • Figure 2(A) is a partial cross-sectional view that shows a cross-section of one part (rocker arms 18 and 20, and a rocker shaft 22) of the variable valve operating apparatus 10 along a plane including the axis line of the rocker shaft 22 and the axis line of switching pins 36, 38, and 44.
  • the variable valve operating apparatus 10 of the present embodiment includes a camshaft 12.
  • the camshaft 12 is connected by a timing chain or a timing belt to a crankshaft that is not illustrated in the drawings, and is configured so as to rotate at half the speed of the crankshaft.
  • One main cam 14 and one auxiliary cam 16 are formed per cylinder on the camshaft 12.
  • Each main cam 14 includes an arcuate base circle portion 14a that is coaxial with the camshaft 12, and a nose portion 14b that is formed such that a part of the base circle is expands outwards in the radial direction.
  • each auxiliary cam 16 is constructed as a cam that has only a base circle portion (a zero-lift cam).
  • Each cylinder of the internal combustion engine is provided with one first rocker arm 18 and one second rocker arm 20 that are adjacent to each other.
  • the rocker arms 18 and 20 of each cylinder are rotatably (rockably) supported by one rocker shaft 22.
  • the rocker arms 18 and 20 are interposed between the cams 14 and 16 and valves 26 as transfer members that transfer an acting force of the main cam 14 to the valves 26.
  • a cam roller 28 is rotatably attached to the first rocker arm 18 at a position at which the cam roller 28 can contact the main cam 14.
  • the first rocker arm 18 is urged by means of a lost motion mechanism 60, described later, so that the cam roller 28 is always in contact with the main cam 14.
  • the configuration relating to the lost motion mechanism 60 is a characterizing portion of the present embodiment, and hence it is described in detail later referring to Figure 3 to Figure 7 .
  • the first rocker arm 18 configured as described above rocks in a manner that takes the rocker shaft 22 as a fulcrum through cooperation between the acting force of the main cam 14 and an urging force of the aforementioned lost motion mechanism 60.
  • the second rocker arm 20 for driving two of the valves 26 is configured in an integrated manner so as to surround the first rocker arm 18 from both sides.
  • a pad 20a is provided on the second rocker arm 20 at a position that can contact the auxiliary cam 16 within the base circle section of the main cam 14. Further, each valve 26 is urged in the closing direction by a valve spring 30.
  • variable valve operating apparatus 10 is equipped with a switching mechanism 32 for switching between a connected state in which the first rocker arm 18 and the second rocker arm 20 are connected together (see Figure 2(A) ) and a non-connected state in which the connection between the first rocker arm 18 and the second rocker arm 20 is released (see Figure 2(B) ).
  • variable valve operating apparatus 10 can switch between a state in which the acting force of the main cam 14 is transferred through the first rocker arm 18 to the second rocker arm 20 (the aforementioned connected state) and a state in which the acting force of the main cam 14 is not transferred to the second rocker arm 20 (the aforementioned non-connected state), and can thereby switch the valve opening characteristics of the valve 26 between a valve operating state and a closed-valve stopped state.
  • a first pin hole 34a that is concentric with the cam roller 28 is formed inside a bush 34 that functions as a spindle of the cam roller 28, and two second pin holes 20bL and 20bR are formed at positions corresponding to the first pin hole 34a inside the second rocker arm 20.
  • a cylindrical first switching pin 36 is movably inserted into the first pin hole 34a.
  • a cylindrical second switching pin 38 that contacts against the first switching pin 36 is movably inserted into the second pin hole 20bL (on the left side in Figure 1 ).
  • the second pin hole 20bL in which the second switching pin 38 has been inserted an end portion on an opposite side to the first rocker arm 18 is blocked by a cap 40.
  • a return spring 42 that urges the second switching pin 38 in the direction of the first rocker arm 18 is disposed inside the second pin hole 20bL.
  • a cylindrical third switching pin 44 that contacts against the first switching pin 36 is movably inserted into the other second pin hole 20bR (on the right side in Figure 1 ).
  • the switching mechanism 32 has a pin driving mechanism for driving the switching pin 36 and the like while resisting the urging force of the return spring 42. More specifically, a link arm 46 having an arm portion 46a that contacts against the third switching pin 44 is disposed at a side of the second rocker arm 20. The link arm 46 is rotatably supported by the rocker shaft 22. Further, as shown in Figure 2 , the rocker shaft 22 is formed in a hollow shape. A link shaft 50 is inserted inside the rocker shaft 22. The link shaft 50 is provided to enable the link arm 46 and a link arm (not shown in the drawings) disposed in another cylinder that is not illustrated in the drawings to be displaced in conjunction with each other in the axial direction of the rocker shaft 22.
  • a projecting portion 46b is provided at a position at which the projecting portion 46b can project toward the circumferential surface of the camshaft 12.
  • a guide rail 54 is provided on the camshaft 12, at a location facing the projecting portion 46b that is formed as a helical groove that extends in the circumferential direction.
  • the switching mechanism 32 includes an electromagnetic solenoid 56 as an actuator that generates a driving force for causing the projecting portion 46b to engage with (be inserted into) the guide rail 54.
  • the electromagnetic solenoid 56 is configured to be duty controlled based on commands from an ECU (Electronic Control Unit) 58 for controlling the operating state of the internal combustion engine.
  • the variable valve operating apparatus 10 of the present embodiment is configured so that, as shown in Figure 2(A) , in a state in which passage of a current to the electromagnetic solenoid 56 is turned off, the projecting portion 46b of the link arm 46 separates from the guide rail 54 and, further, the link arm 46 receives the urging force of the return spring 42 and is positioned at a displacement end Pmax1.
  • the first rocker arm 18 and the second rocker arm 20 are in a state in which they are connected through the switching pins 36 and 38.
  • the state is a valve operating state in which the acting force of the main cam 14 is transferred to both of the valves 26 through the second rocker arm 20 from the first rocker arm 18.
  • variable valve operating apparatus 10 of the present embodiment is configured so that, as shown in Figure 2(B) , when a current is passed to the electromagnetic solenoid 56, the projecting portion 46b engages with the guide rail 54 as a result of rotation of the link arm 46 that is pushed by the drive shaft 56a, and as a result the link arm 46 is displaced toward a displacement end Pmax2.
  • variable valve operating apparatus 10 is configured so that, during a period in which passage of a current to the electromagnetic solenoid 56 is continuing, in a state in which the projecting portion 46b is separated from the camshaft 12 and in which the urging force of the return spring 42 is being received and borne by the engagement between the link arm 46 and the drive shaft 56a of the electromagnetic solenoid, the link arm 46 is retained in position.
  • Figure 2 (B) the first rocker arm 18 and the second rocker arm 20 are not connected to each other.
  • the operating state of the valve 26 is the closed-valve stopped state.
  • the variable valve operating apparatus 10 of the present embodiment by switching between states in which passage of a current to the electromagnetic solenoid 56 is turned on and off, the operating state of the valves 26 can be switched between a valve operating state and a closed-valve stopped state by utilizing the switching pin 36 and the like.
  • the configuration of the pin driving mechanism is not limited to the above described configuration, and for example, the pin driving mechanism may be a mechanism in which the switching pin 36 and the like are driven utilizing an electric motor or hydraulic pressure.
  • Figure 3 is a perspective view for describing a characteristic support structure of the lost motion mechanism 60 according to Embodiment 1 of the present invention. More specifically, Figure 3 is a partial cross-sectional view that shows a cross-section of each constituent element mounted on a cylinder head 62 taken at a center position of the lost motion mechanism 60.
  • a spark plug tube 66 for guiding attachment and detachment of a spark plug 64 is press-fitted into a center part of the cylinder head 62 that functions as a base member on which the variable valve operating apparatus 10 is mounted.
  • An attachment portion 68a of a holding member 68 that holds the lost motion mechanism 60 is attached to the spark plug tube 66.
  • FIG 4 is a perspective view that shows the external shape of the holding member 68 shown in Figure 3 .
  • the holding member 68 includes a holding portion 68b that holds the lost motion mechanism 60, and a connecting portion 68c that connects the attachment portion 68a and the holding portion 68b. More specifically, the lost motion mechanism 60 of the present embodiment is attached to the spark plug tube 66 through the holding member 68.
  • the spark plug tube 66 is formed in a cylindrical shape.
  • the attachment portion 68a into which the spark plug tube 66 is fitted is also formed in a cylindrical shape in which both ends are open.
  • the attachment portion 68a is supported by the spark plug tube 66 in a condition in which the holding member 68 is rotatable in the circumferential direction of the spark plug tube 66.
  • the lost motion mechanism 60 includes a lost motion spring 70, and a lifter 72 that is interposed between the lost motion spring 70 and the first rocker arm 18.
  • the holding portion 68b of the holding member 68 has a cylindrical form in which both ends are open.
  • the lost motion spring 70 and the lifter 72 are accommodated inside the holding portion 68b.
  • the lifter 72 is formed in a cylindrical shape in which one end is open and the other end is closed.
  • the lost motion spring 70 is accommodated inside the lifter 72. More specifically, one end of the lost motion spring 70 contacts a top portion 72a of the lifter 72 that is closed, and the other end thereof contacts the cylinder head 62. That is, the lost motion spring 70 is configured so as to urge the first rocker arm 18 toward the main cam 14 through the top portion 72a of the lifter 72 while utilizing the cylinder head 62 as a bearing surface that receives the spring load.
  • the holding portion 68b is formed so as to cover the lateral face of the lifter 72 that is a trunk portion of the lost motion mechanism 60 and a lateral face of the lost motion spring 70 from outside.
  • a cross-sectional shape (annular circular shape) of the holding portion 68b that is taken in a direction perpendicular to the axis line of the lost motion mechanism 60 is an enlarged shape of the cross-sectional shape (circular shape) of the lifter 72.
  • Figure 5 shows views for describing a configuration that the variable valve operating apparatus 10 is provided with for performing positioning between the first rocker arm 18 and the lost motion mechanism 60. More specifically, Figure 5(A) is a view that shows the first rocker arm 18 as seen from the direction of a region that the lost motion mechanism 60 contacts, and Figure 5(B) is a view that shows the lifter 72 as seen from the top portion 72a side.
  • an engagement groove 72b is formed in the (outer surface of the) top portion 72a of the lifter 72 that contacts with the first rocker arm 18. More specifically, the engagement groove 72b is formed so as to transverse the outer surface of the top portion 72a while the center in the width direction of the groove passes through the axis line of the lifter 72.
  • a protrusion-shaped pad 18a that engages with the engagement groove 72b is formed at an area facing the top portion 72a on the first rocker arm 18. More specifically, the pad 18a is formed so as to extend along the direction of movement of the first rocker arm 18 when viewing the first rocker arm 18 from the lifter 72.
  • Figure 6 is a view for describing an effect produced by the support structure of the lost motion mechanism 60 according to Embodiment 1 of the present invention.
  • the lost motion mechanism 60 of the present embodiment is attached to the spark plug tube 66 through the holding member 68. Therefore, it is not necessary to form a support portion of the lost motion mechanism 60 by casting on the top face of the cylinder head 62.
  • a boss portion that includes excess thickness is not required, and thus manufacture of the aforementioned support portion can be facilitated and the mass of the internal combustion engine can be reduced. It is thus possible to prevent a deterioration in the fuel consumption performance of the vehicle that is attributable to an increase in the mass of the internal combustion engine. Further, since processing with respect to a large component such as the cylinder head 62 can be reduced, the processing costs can be decreased.
  • the first rocker arm 18 is disposed at a position that is surrounded by the second rocker arm 20 that pushes and moves the two valves 26.
  • the first rocker arm 18 is disposed so as to be sandwiched between two of the valves 26.
  • the spark plug tube 66 is disposed in the center of each cylinder.
  • the two valves 26 are disposed at positions that are equidistant from the center of the respective cylinders in which the spark plug tube 66 is arranged and that are symmetrical positions in the longitudinal direction of the cylinder head 62 when taking the center of each cylinder as a reference.
  • the first rocker arm 18 and the spark plug tube 66 are disposed adjacent to each other as shown in Figure 3 .
  • the lost motion mechanism 60 is attached through the holding member 68 to the spark plug tube 66 configured in this manner. Therefore, the connecting portion 68c of the holding member 68 can be shortened. It is thereby possible to favorably ensure the rigidity of the holding member 68 and to also reduce the weight of the holding member 68.
  • the holding portion 68b of the holding member 68 carries out only a guiding function that guides expansion and contraction of the lost motion mechanism 60, and the cylinder head 62 as a base member is responsible for bearing the spring load of the lost motion spring 70. Since it is thereby possible to decrease a force that acts on the holding member 68, the weight of the holding member 68 can be reduced.
  • the cross-sectional shape of the holding portion 68b that is taken in a direction perpendicular to the axis line of the lost motion mechanism 60 is an enlarged shape of the cross-sectional shape of the lifter 72. Since it is thus not necessary to provide an unrequired protruding portion in the holding member 68, the weight of the holding member 68 can be reduced.
  • Figure 7 is a cross-sectional view that shows a cross-section of the lost motion mechanism 60 and the first rocker arm 18 taken at the axis line position of the lost motion mechanism 60 as seen from the advancing direction of the engagement groove 72b.
  • the attachment portion 68a of the holding member 68 is supported by the spark plug tube 66 in a state in which the holding member 68 is rotatable in the circumferential direction of the spark plug tube 66.
  • positioning of the lifter 72 with respect to the first rocker arm 18 is performed by engagement between the engagement groove 72b formed in the lifter 72 and the pad 18a formed on the first rocker arm 18.
  • the main cam 14 corresponds to "cam” according to the above described first aspect of the present invention
  • the first rocker arm 18 corresponds to “transfer member” according to the first aspect of the present invention
  • the lost motion mechanism 60 corresponds to "urging means” according to the first aspect of the present invention.
  • the pad 18a formed on the first rocker arm 18 corresponds to "projecting portion” according to the above described third aspect of the present invention.
  • the cylinder head 62 corresponds to "base member” according to the above described eighth aspect of the present invention.
  • FIG. 8 is a view that schematically shows the configuration of a valve operating apparatus 80 according to Embodiment 2 of the present invention. Note that, in Figure 8 , elements that are the same as constituent elements shown in the above described Figure 1 are denoted by the same reference symbols, and a description of those elements is omitted or simplified hereunder.
  • the valve operating apparatus 80 shown in Figure 8 is provided with a rocker arm 84 as a transfer member that is interposed between a cam 82 and the valve 26. More specifically, an end portion of the valve 26 contacts against one end of the rocker arm 84, and a cam roller 86 is arranged at a center part of the rocker arm 84. The other end of the rocker arm 84 is supported by a lash adjuster 88. According to this configuration, the rocker arm 84 can pivot in a manner that takes the end portion (the aforementioned other end) supported by the lash adjuster 88 as a fulcrum.
  • the lash adjuster 88 has a function of expanding and contracting to make the tappet clearance zero.
  • the spark plug tube 66 is press-fitted into the cylinder head 62.
  • the lash adjuster 88 is attached to the spark plug tube 66 through a holding member 90.
  • the holding member 90 includes an attachment portion 90a that is attached to the spark plug tube 66, a holding portion 90b that holds the lash adjuster 88, and a connecting portion 90c that connects the attachment portion 90a and the holding portion 90b.
  • One end of the lash adjuster 88 contacts the aforementioned other end of the rocker arm 84 as described above.
  • the other end of the lash adjuster 88 contacts the cylinder head 62.
  • the lash adjuster 88 is configured so that the rocker arm 84 can be urged towards the cam 82 while utilizing the cylinder head 62 as a bearing surface that receives a load that acts on the lash adjuster 88 through the rocker arm 84.
  • the holding portion 90b is formed so as to cover the lateral face of the lash adjuster 88 that is a trunk portion of the lash adjuster 88 from outside.
  • a cross-sectional shape (annular circular shape) of the holding portion 90b that is taken in a direction perpendicular to the axis line of the lash adjuster 88 is an enlarged shape of the cross-sectional shape (circular shape) of the lash adjuster 88.
  • a projecting portion 88a of the lash adjuster 88 that functions as a fulcrum of the rocker arm 84 is configured so as to engage with an engagement groove 84a provided in the aforementioned other end of the rocker arm 84.
  • the lash adjuster 88 that is used as urging means that urges the rocker arm 84 that is a transfer member is attached to the spark plug tube 66 through the holding member 90.
  • the necessity to form a support portion of the lash adjuster 88 by casting on the top face of the cylinder head 62 is eliminated.
  • a boss portion that includes excess thickness is not required, and thus manufacture of the aforementioned support portion can be facilitated and the mass of the internal combustion engine can be reduced. It is thereby possible to prevent a deterioration in the fuel consumption performance of the vehicle that is attributable to an increase in the mass of the internal combustion engine.
  • the same advantageous effects as in the above described Embodiment 1 can also be achieved.
  • the rocker arm 84 corresponds to "transfer member” according to the above described first aspect of the present invention
  • the lash adjuster 88 corresponds to "urging means” according to the first aspect of the present invention.
  • FIG. 9 is a view that schematically shows the configuration of another valve operating apparatus that is applicable to the present invention.
  • a variable valve operating apparatus 100 shown in Figure 9 is equipped with a first rocker arm 102 that is the same as the above described first rocker arm 18, as a transfer member that is interposed between the main cam 14 and the valve 26 (not shown in Figure 9 ). More specifically, one end of the first rocker arm 102 is rotatably supported by the rocker shaft 22, and a cam roller 104 is arranged at a center part of the first rocker arm 102.
  • a lost motion arm 106 formed in an L-shape is fixed to the other end of the first rocker arm 102.
  • the variable valve operating apparatus 100 is also equipped with a lost motion mechanism 108 that urges the first rocker arm 102 toward the main cam 14 through the lost motion arm 106.
  • the lost motion mechanism 108 includes a lost motion spring 110 and a lifter 112 that is interposed between the lost motion spring 110 and the lost motion arm 106.
  • the spark plug tube 66 is press-fitted into the cylinder head 62.
  • the lost motion mechanism 108 is attached to the spark plug tube 66 through a holding member 114.
  • the holding member 114 includes an attachment portion 114a that is attached to the spark plug tube 66, and a holding portion 114b that holds the lost motion mechanism 108. Note that, the holding member 114 shown in Figure 9 is not equipped with a connecting portion, and the holding portion 114b is attached in a perpendicular direction with respect to the attachment portion 114a.
  • an engagement groove 112b that engages with a pad 106a provided on the lost motion arm 106 is formed in a top portion 112a of the lifter 112.
  • an auxiliary cam of the present invention is not limited to a zero-lift cam. More specifically, for example, with respect to the configuration of the above described variable valve operating apparatus 10, a configuration may also be adopted in which the auxiliary cam includes a nose portion that is constructed so as to obtain a lift that is less than that of the main cam 14. According to a configuration in which this kind of auxiliary cam is provided, it is possible to switch a lift amount (and/or a working angle) of a valve between two stages by means of the main cam and auxiliary cam.
  • variable valve operating apparatus 10 is described as an example of a valve operating apparatus.
  • a valve operating apparatus that is an object of the present invention is not limited to a valve operating apparatus configured as a variable valve operating apparatus. More specifically, it is sufficient that the valve operating apparatus is equipped with a holding member that holds urging means that urges a transfer member that is interposed between a cam and a valve.
  • a transfer member according to the present invention is not limited to a rocker arm. More specifically, it is sufficient that a transfer member is a member that is interposed between a cam and a valve and transfers an acting force of the cam to the valve.
  • the engagement groove 72b is formed in the top portion 72a of the lifter 72 of the lost motion mechanism 60, and the pad (projecting portion) 18a that engages with the engagement groove 72b is formed at a region that faces the lifter 72 on the first rocker arm 18.
  • the present invention is not limited thereto and, for example, a configuration may be adopted in which a projecting portion such as a pad is formed on the top portion 72a side of the lifter 72 that is the urging means and an engagement groove is formed on first rocker arm 18 side that is the transfer member.
  • Embodiment 1 has been described taking the lost motion mechanism 60 that urges the first rocker arm 18 in a pushing direction towards the main cam 14 as an example.
  • the configuration of urging means according to the present invention is not limited thereto and, for example, it is sufficient that the urging means is means that generates an urging force in a direction that draws in a transfer member such as the first rocker arm 18.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
EP10849438.6A 2010-04-07 2010-04-07 Actionneur de soupape pour moteur à combustion interne Withdrawn EP2557280A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2010/056332 WO2011125194A1 (fr) 2010-04-07 2010-04-07 Actionneur de soupape pour moteur à combustion interne

Publications (2)

Publication Number Publication Date
EP2557280A1 true EP2557280A1 (fr) 2013-02-13
EP2557280A4 EP2557280A4 (fr) 2013-06-12

Family

ID=44762180

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10849438.6A Withdrawn EP2557280A4 (fr) 2010-04-07 2010-04-07 Actionneur de soupape pour moteur à combustion interne

Country Status (5)

Country Link
US (1) US20130042830A1 (fr)
EP (1) EP2557280A4 (fr)
JP (1) JP5299564B2 (fr)
CN (1) CN102892979A (fr)
WO (1) WO2011125194A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112219016A (zh) * 2018-05-22 2021-01-12 Avl李斯特有限公司 内燃机的气门传动装置

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6420783B2 (ja) 2016-03-31 2018-11-07 本田技研工業株式会社 可変動弁装置
DE102017114575A1 (de) * 2017-06-29 2019-01-03 Man Truck & Bus Ag Variabler Ventiltrieb
JP6932179B2 (ja) * 2019-12-27 2021-09-08 ヤマハ発動機株式会社 ロストモーション機構、動弁装置およびエンジン

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3638765A1 (de) * 1985-11-18 1987-05-21 Toyota Motor Co Ltd Befestigungskonstruktion fuer einen zylinderkopfdeckel
GB2192431A (en) * 1986-07-09 1988-01-13 Honda Motor Co Ltd I.c.engine cylinder head valve gear and spark plug arrangement
EP0607918A1 (fr) * 1993-01-18 1994-07-27 Honda Giken Kogyo Kabushiki Kaisha Dispositif de commande de soupapes pour moteur à combustion interne à arbre à cames en tête unique
DE19806675A1 (de) * 1998-02-18 1999-08-19 Daimler Chrysler Ag Vorrichtung zur variablen Steuerung der Ventile einer Hubkolben-Brennkraftmaschine
JP2000087719A (ja) * 1998-09-11 2000-03-28 Honda Motor Co Ltd 内燃機関の潤滑構造
EP1013898A2 (fr) * 1998-12-22 2000-06-28 Honda Giken Kogyo Kabushiki Kaisha Dispositif de commande de soupape pour moteur à combustion interne

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0716004Y2 (ja) * 1988-09-24 1995-04-12 三菱自動車工業株式会社 多気筒エンジンのシリンダヘッド
JPH06280522A (ja) 1993-03-29 1994-10-04 Mazda Motor Corp エンジンのシリンダヘッド構造
JP3320046B2 (ja) 1998-12-23 2002-09-03 本田技研工業株式会社 内燃機関の動弁装置
JP2002242629A (ja) * 2001-02-20 2002-08-28 Yamaha Motor Co Ltd 内燃エンジンの可変動弁機構
US7406932B2 (en) * 2005-08-15 2008-08-05 Honda Motor Co., Ltd. Lift-variable valve-operating system for internal combustion engine
JP2007327378A (ja) 2006-06-07 2007-12-20 Honda Motor Co Ltd 点火プラグチューブの取付構造
JP2008190441A (ja) * 2007-02-06 2008-08-21 Honda Motor Co Ltd 可変動弁機構におけるリフト量調整装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3638765A1 (de) * 1985-11-18 1987-05-21 Toyota Motor Co Ltd Befestigungskonstruktion fuer einen zylinderkopfdeckel
GB2192431A (en) * 1986-07-09 1988-01-13 Honda Motor Co Ltd I.c.engine cylinder head valve gear and spark plug arrangement
EP0607918A1 (fr) * 1993-01-18 1994-07-27 Honda Giken Kogyo Kabushiki Kaisha Dispositif de commande de soupapes pour moteur à combustion interne à arbre à cames en tête unique
DE19806675A1 (de) * 1998-02-18 1999-08-19 Daimler Chrysler Ag Vorrichtung zur variablen Steuerung der Ventile einer Hubkolben-Brennkraftmaschine
JP2000087719A (ja) * 1998-09-11 2000-03-28 Honda Motor Co Ltd 内燃機関の潤滑構造
EP1013898A2 (fr) * 1998-12-22 2000-06-28 Honda Giken Kogyo Kabushiki Kaisha Dispositif de commande de soupape pour moteur à combustion interne

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2011125194A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112219016A (zh) * 2018-05-22 2021-01-12 Avl李斯特有限公司 内燃机的气门传动装置
CN112219016B (zh) * 2018-05-22 2022-05-10 Avl李斯特有限公司 内燃机的气门传动装置

Also Published As

Publication number Publication date
JP5299564B2 (ja) 2013-09-25
WO2011125194A1 (fr) 2011-10-13
JPWO2011125194A1 (ja) 2013-07-08
CN102892979A (zh) 2013-01-23
US20130042830A1 (en) 2013-02-21
EP2557280A4 (fr) 2013-06-12

Similar Documents

Publication Publication Date Title
US8925504B2 (en) Variable valve operating apparatus for internal combustion engine
US8047168B2 (en) Continuously variable valve lift system for engine
JP4752949B2 (ja) 内燃機関の可変動弁装置
WO2009136551A1 (fr) Système d'actionnement de soupape pour moteurs à combustion interne
JP5158190B2 (ja) 内燃機関の可変動弁装置
US8813698B2 (en) Variable valve apparatus of internal combustion engine
CN108729969B (zh) 可变的阀动装置
EP2557280A1 (fr) Actionneur de soupape pour moteur à combustion interne
EP2615267B1 (fr) Mécanisme de train de soupapes de moteur à combustion interne
JP4469341B2 (ja) 可変動弁機構
JP2005155555A (ja) 可変動弁機構
US7143730B2 (en) Valve timing control system for internal combustion engine
EP1707767A1 (fr) Dispositif de commande de soupape pour moteur
JP4762963B2 (ja) 開弁特性可変型内燃機関
US8794204B2 (en) Valvetrain for overhead valve engine
JP5556605B2 (ja) 内燃機関の可変動弁装置
EP4083394A1 (fr) Mécanisme de soupape réglable
US20090229549A1 (en) Variable valve mechanism for engine
KR20080028676A (ko) 스윙-암형 가변 밸브 리프트의 래칭 장치 및 그 가공 방법
JP5447211B2 (ja) 内燃機関の可変動弁装置
JP2009150232A (ja) 内燃機関におけるバルブリフト可変式動弁装置
JP2012127272A (ja) 可変カムシャフト
JP2009264140A (ja) 開弁特性可変型内燃機関
JP2010265799A (ja) 可変動弁機構用コントロールシャフト
JP2009257145A (ja) 開弁特性可変型内燃機関

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20121019

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: TOYOTA JIDOSHA KABUSHIKI KAISHA

A4 Supplementary search report drawn up and despatched

Effective date: 20130510

RIC1 Information provided on ipc code assigned before grant

Ipc: F01L 1/18 20060101ALI20130503BHEP

Ipc: F01L 13/00 20060101AFI20130503BHEP

Ipc: F01L 1/26 20060101ALI20130503BHEP

DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Effective date: 20130726