EP0422277A1 - Brennkammer und Ventilsteuervorrichtung für Mehrventil-Brennkraftmaschine - Google Patents

Brennkammer und Ventilsteuervorrichtung für Mehrventil-Brennkraftmaschine Download PDF

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Publication number
EP0422277A1
EP0422277A1 EP89119004A EP89119004A EP0422277A1 EP 0422277 A1 EP0422277 A1 EP 0422277A1 EP 89119004 A EP89119004 A EP 89119004A EP 89119004 A EP89119004 A EP 89119004A EP 0422277 A1 EP0422277 A1 EP 0422277A1
Authority
EP
European Patent Office
Prior art keywords
cylinder head
camshaft
set forth
valves
rocker arm
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.)
Granted
Application number
EP89119004A
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English (en)
French (fr)
Other versions
EP0422277B1 (de
Inventor
Isao Morishita
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.)
Yamaha Motor Co Ltd
Original Assignee
Yamaha Motor Co Ltd
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 Yamaha Motor Co Ltd filed Critical Yamaha Motor Co Ltd
Priority to EP89119004A priority Critical patent/EP0422277B1/de
Priority to DE1989613740 priority patent/DE68913740T2/de
Publication of EP0422277A1 publication Critical patent/EP0422277A1/de
Application granted granted Critical
Publication of EP0422277B1 publication Critical patent/EP0422277B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F02F1/242—Arrangement of spark plugs or injectors
    • 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
    • F01L1/053—Camshafts overhead type
    • 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
    • F01L1/265—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 peculiar to machines or engines with three or more intake 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
    • F02F1/4221—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder particularly for three or more inlet valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/20—SOHC [Single overhead camshaft]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
    • 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
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/245—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis

Definitions

  • This invention relates to a combustion chamber configuration and valve operating arrangement for a multi-valve engine.
  • rocker arm arrangement for operating the valves from the camshaft so that the valves can be located in the combustion chamber at optimum positions and may reciprocate along the desired axes.
  • rocker arms it is also necessary to provide an arrangement for pivotally journaling the rocker arms.
  • individual rocker arm supports have been proposed, these supports have a tendency of permitting the rocker arm to move transversely or rotate about an axis perpendicular to their normal pivotal axis and can adversely affect high speed performance. Therefore, it is desirable to mount the rocker arms for their pivotal movement on a rocker arm shaft which shaft will tend to maintain the movement of the rocker arm in its desired path.
  • the use of the rocker arm shafts can give rise to other problems, particularly in the placement of other components of the engine.
  • valves In connection with the use of multiple valves, it is a desirable practice to employ three intake valves for each cylinder of the engine. In order to facilitate operation of the valves and their placement, it has been the practice to place two of these valves, the outermost valves, so they reciprocate about parallel acute axes to a plane containing the cylinder bore axis. The third, middle valve, is disposed outwardly toward the periphery of the cylinder bore from this plane and also reciprocates about an axis that is at an acute angle to the plane but which angle is less than the aforenoted angle. Although this arrangement is particularly useful, the placement of the valve heads previously proposed has been such as to require the formation of a fairly deep recess in the peripheral edge of the piston so as to provide clearance. This can present certain difficulties.
  • a first feature of this invention is adapted to be embodied in a cylinder head for an internal combustion engine that has a lower surface which defines in part a combustion chamber.
  • a first plurality of valves are supported for reciprocation along axes that lie at acute angles on one side of a plane passing generally through the center of the cylinder head.
  • a second plurality of valves reciprocate along axes that lie at acute angles to the plane on the other side thereof.
  • the area of the cylinder head spaced from its lower surface and between the portions supporting the valves define generally a void.
  • a bridging member is formed integrally by the cylinder head and extends across the void and within an area bounded by an extension of the combustion chamber surface for reinforcing the cylinder head.
  • Another feature of the invention is also adapted to be embodied in a cylinder head assembly for an internal combustion engine.
  • the assembly comprises a cylinder head having a surface defining in part a combustion chamber.
  • a camshaft is rotatable about a camshaft axis that lies in a plane that extends transversely to the combustion chamber.
  • First valve means are supported for reciprocation substantially on one side of the plane and second valve means are supported for reciprocation substantially on the other side of the plane.
  • the valve means all serve the combustion chamber and comprise poppet valves.
  • the number of poppet valves of the first valve means is greater than the number of poppet valves of the second valve means.
  • the camshaft axis lies closer to the first valve means than to the second valve means.
  • Another feature of the invention is adapted to be embodied in a camshaft arrangement for a multiple valve internal combustion engine that comprises a cylinder head that is adapted to form in part a combustion chamber.
  • a camshaft is journaled for rotation relative to the cylinder head about a camshaft axis.
  • a first plurality of valves are supported for reciprocation about axes that lie substantially on one side of the camshaft axis and a second plurality of valves are supported for reciprocation about axes lying on the other side of the camshaft axis.
  • Valve actuating means operate all of the valves from the camshaft and this valve actuating means includes at least a pair of cam lobes that are formed on the camshaft.
  • a pair of pivotally supported rocker arms each have a follower portion engaged with a respective one of the pair of cam lobes for pivoting the rocker arm means.
  • Bearing means journal the camshaft for rotation about a bearing surface that is disposed between the cam lobes and adjacent to them.
  • Yet another feature of the invention is adapted to be embodied in a cylinder head assembly for an internal combustion engine and comprises a cylinder head forming in part a combustion chamber.
  • a plurality of poppet valves are supported for reciprocation by the cylinder head and serve the combustion chamber.
  • a camshaft is provided and bearing cap means are affixed to the cylinder head and journal the camshaft with the cylinder head for rotation about a camshaft axis.
  • At least one rocker arm is supported for pivotal movement upon a rocker arm shaft carried by the bearing cap means.
  • An opening is formed in the bearing cap means and is aligned with an opening in the cylinder head for passage of a component fixed at least to the cylinder head.
  • the bearing cap opening passes across an area where the rocker arm shaft extends and the rocker arm shaft is formed with a relief in the area of the opening to pass the component with a clearance.
  • Yet another feature of the invention is adapted to be embodied in a cylinder head assembly for cooperation with a cylinder bore to form a combustion chamber.
  • the cylinder head assembly supports three poppet valves for reciprocation.
  • a first two of these poppet valves reciprocate about parallel axes that are inclined at an acute angle to a plane containing the axis of the cylinder bore.
  • the third of these valves also reciprocates about an axis that is disposed at an acute angle to this plane but at a lesser acute angle than the angle of reciprocation by the first two valves.
  • the third valve is disposed further from the plane and in their closed positions, the edge of the head of the third valve is disposed at a point that is not lower than the adjacent portions of the heads of the first two valves toward the cylinder bore.
  • a motorcycle powered by an internal combustion engine constructed in accordance with an embodiment of the invention is identified generally by the reference numeral 11.
  • the motorcycle is depicted as a typical environment in which an engine embodying the invention may be employed.
  • the invention has particular utility in conjunction with internal combustion engines used to power vehicles. However, it will be readily apparent to those skilled in the art that the invention may be practiced in conjunction with other engine applications.
  • the motorcycle 11 is comprised of a frame assembly, indicated generally by the refernce numeral 12, and which is of the welded up type including a head pipe 13 that journals a front fork assembly 14 for steering movement and which supports a front wheel 15 in a known manner.
  • a rear wheel 16 is supported by the frame assembly 12 by means including a trailing arm suspension 17.
  • An internal combustion engine is supported within the frame assembly 12 by means including an engine mount 19 that is affixed to a gusset plate 21 which is affixed to or forms a part of the frame assembly 12 in a manner as will be later described by reference to Figure 5.
  • the engine 18 is further supported in a suitable manner from a down tube 22 of the frame 12.
  • a fuel tank 23 is supported by the frame 12 above the engine 18 and supplies fuel to the engine in a known manner and specifically to carburetors 24 thereof.
  • An air cleaner 25 supplies filtered air to the carburetors 24.
  • a seat 26 is supported on the rear of the frame assembly 12 behind the fuel tank 23 so as to accommodate a rider.
  • the engine 18 or at least portions of it are water cooled and for this purpose there is mounted a radiator 30 on the frame assembly 12 forwardly of the down tube 22.
  • the construction of the motorcycle and its drive arrangement as thus far described may be considered to be conventional and, for that reason, further description of the motorcycle per se is not believed to be necessary to understand the construction and operation of the invention.
  • the engine 18 is comprised of a cylinder block assembly 29 that defines one or more cylinder bores 31 by means of pressed in or otherwise inserted liners 32.
  • a piston 33 is supported for recpirocation within the cylinder bore 31 and is connected by means of a connecting rod (not shown) to a crankshaft for driving it in a known manner.
  • a cylinder head assembly is affixed to the cylinder block 29 in a known manner and has a downwardly facing sealing surface 35 that is adapted to cooperate with a gasket (not shown) interposed between this surface and a corresponding upper surface of the cylinder block 29 for sealing purposes.
  • the cylinder block Centrally of the sealing surface 35, the cylinder block is provided with a combustion chamber area 36 that is defined by a recess 37 of the cylinder head 34, the head of the piston 33 and cylinder bore 31.
  • the volume of the chamber 36 varies, of course, with the reciprocation of the piston 33 and is shown in Figure 2 at its top dead center position.
  • a multiple intake valve assembly which lies generally on one side of a plane containing the axis C of the cylinder bore 31 ( Figure 3) and which extends perpendicularly to the plane of Figure 2.
  • This intake valve assembly includes a pair of intake valves 38 which are supported for reciprocation about parallel axes that are disposed at an acute angle to the aforenoted plane.
  • a further intake valve 39 that is supported by the cylinder head assembly 34 for reciprocation about an acute angle to the aforenoted plane but which angle is different than the angle of the intake valves 38.
  • the disposition of the intake valves 38 and 39 is generally as set forth in United States Letters Patent 4,660,529, entitled “Four Cycle Engine”, issued April 28, 1987 and assigned to the assignee of this application except as will be hereinafter noted. The disclosure of that application for the particular valve orientation and the advantages of it is incorporated herein by reference.
  • Each of the intake valves 38 and 39 is formed with a head portion 41 that cooperates with a respective valve seat 42 that is pressed into the cylinder head assembly 34 in a known manner.
  • These valve seats are formed at the termination of an intake port 43 that extends through one side of the cylinder head assembly 34 from a single inlet as best shown in Figure 3 and which terminates at the individual valve seats 42.
  • Each of the valves 38 and 39 further has a stem portion 44 that is supported for reciprocation within a respective guide 45 formed in a portion 46 of the cylinder head 34.
  • the angular disposition of the stems 44 is such that the tips thereof all lie on a line A as seen in Figure 3 when the valves 39 and 39 are closed.
  • valves 38 and 39 are urged toward their closed positions by means of coil compression spring assemblies 47 that bear at their lower ends against a bearing plate 48 engaged with the cylinder head 34 or formed on the respective valve guide 45 and at their upper ends with a spring retainer 49 that is held to the stem 44 of the respective valve by a keeper assembly of a known type.
  • Patent 4,660,529 The valve placement shown in Patent 4,660,529 is such that the head of the intake valve 39, which is disposed furthest from the plane containing the cylinder bore axis, has the tip or toe portion of it disposed lower than or at the same point as the adjacent portions of the valves 38. At a result of this, it may be necessary to form a recess in the head of the piston 33 for clearance purposes.
  • the head 41 of this outermost valve 39 is raised so that its toe portion does not extend below the heads 41 of the valves 38 as may be clearly seen in Figure 2. As a result, a lesser recessed area is necessary in the head of the piston 33 for clearance purposes.
  • valves 51 On the opposite side of the aforenoted plane, there are supported in the cylinder head assembly 34 a pair of exhaust valves 51 which have stem portions 52 that are reciprocally supported in the cylinder head assembly 34 by valve guides of the type aforedescribed.
  • the valve stems 52 reciprocate about parallel axes which are disposed at an acute angle to the aforenoted plane and which acute angle is less than the acute angle of the pair of intake valves 38 and greater than the acute angle of the intake valve 39.
  • the tips of the stems 52 lie along a line B ( Figure 3) when the exhaust valves 51 are closed.
  • These exhaust valves 51 control the flow of exhaust gases from the combustion chamber to respective exhaust ports 53 formed in the side of the cylinder head 34 opposite the intake passage 43.
  • the valves 51 cooperate with valve seats 54 in a known manner so as to control this flow.
  • All of the intake valves 38 and 39 and both of the exhaust valves 51 are operated by means of a single overhead camshaft 55.
  • the camshaft 55 is journaled, in a manner to be described, for rotation about a camshaft axis that extends parallel to the aforenoted plane and which is offset slightly from one side thereof and the cylinder bore axis C by the distance D2 toward the intake valves 38 and 39.
  • the axes of reciprocation of the intake valves 38 and 39 all lie on one side of a plane containing the axis of rotation of the camshaft 55 while the axes of reciprocation of the exhaust valves 51 lies on the other side of this plane.
  • the camshaft 55 since it operates all of the valves 38, 39 and 51, must be very rigidly supported so as to resist any bending forces on it.
  • the camshaft 55 is provided with spaced bearing portions adjacent its ends which are journaled within bearing surfaces 56 formed by the cylinder head 34.
  • a central bearing portion on the camshaft inwardly of its ends that is journaled on a bearing surfaces 57 of the cylinder head assembly 34.
  • the center of this camshaft bearing surface and the cylinder head bearing surface is offset a distance D1 from the cylinder bore axis C.
  • the bearing surfaces 56 and 57 of the cylinder head cooperate with corresponding bearing surfaces formed by a combined bearing cap and cam cover assembly, indicated generally by the reference numeral 59 and which is affixed to the cylinder head 34 in a manner to be described.
  • One of the intake valves 38 and the intake valve 39 are operated by a single intake lobe 61 of the cam shaft 52, which lobe 61 is disposed between the bearing surfaces of the camshaft which cooperate with the cylinder head bearing surfaces 56 and 57 and the corresponding bearing portions of the cam cover, bearing cap 59.
  • the construction is extremely rigid.
  • the cam lobe 61 cooperates with a follower portion 62 of a first intake rocker arm 63 that is journaled in the cam cover, bearing cap 59 on a rocker arm shaft 64.
  • the rocker arm shaft 64 is journaled in a suitable manner in the cover 59.
  • the rocker arm 63 has two extending arm portions 65.
  • the portions 65 carry adjusting screws 66 that cooperate with the tips of the stem of one of the pair of intake valves 38 and the tip of the stem at the valve 39 so as to operate these valves.
  • the camshaft 55 is provided with a further cam lobe 67 that is disposed on the opposite side of the central bearing portion of the camshaft which cooperates with the cylinder head bearing surface 57 from the cam lobe 61.
  • the cam lobe 67 is located between the bearing surfaces 55 and 56 and cooperates with a second intake rocker arm 68 that is also journaled on the rocker arm shaft 64.
  • the rocker arm 68 is a single rocker arm and carries an adjusting screw 69 for operating the remaining valve of the intake valve pair 38.
  • the camshaft 55 is also provided with a pair of exhaust lobes 70 which lobes are each disposed between a respective one of the end bearing surfaces on the camshaft and the intake lobes 61 and 67.
  • a pair of exhaust rocker arms, indicated generally by the reference numerals 71 each have follower portions 72 that cooperate with a respective of the exhaust cam lobes 70 for pivoting the rocker arms 71 about a rocker arm shaft 73 which, like the rocker arm shaft 64, is carried by the cam cover and bearing cap 59. Adjusting screws 74 carried at the outer ends 75 of the rocker arms 71 contact the tips of the exhaust valve stems 52 for operating the exhaust valves in a known manner.
  • the engine is also provided with a spark plug 76 for firing the charge in the combustion chamber 37.
  • the spark plug 76 is received within a spark plug receiving recess 77 formed by aligned bores 78 and 79 formed in the cylinder head 34 and cam cover 59, respectively.
  • a tapped hole 81 formed at the bottom of the cylinder head bore 78 receives the threads of the spark plug so that its gap will be positioned generally centrally of the combustion chamber 37.
  • the cylinder head 34 is also provided with a cooling jacket 82 through which coolant is circulated from a cooling jacket 83 of the cylinder block 29 in a manner described in my copending application entitled “Cylinder Head Cooling For Multiple Valve Engine", Serial No. , filed , and assigned to the assignee of this application (Attorney Docket No. 2503-01339).
  • the camshaft 55 carries a sprocket 84 at one end which is driven at one-half crankshaft speed by a chain 85.
  • the provision of the cooling cavity 82 gives the cylinder head 34 a generally open V-type configuration.
  • a bridging member 86 that extends across the upper portion of the cooling cavity 82 and which serves as a bridging portion between the opposite sides of the cylinder head to additionally provide the bearing surface 57 for the center bearing portion of the camshaft 55.
  • This bridging portion 86 also extends into the spark plug well 77 so as to provide good reinforcing for the cylinder head in this area.
  • this bridging member which extends substantially across the center portion of the combustion chamber 36, the cylinder head will be quite strong.
  • the bearing cap, cam cover 59 is held to the cylinder head 34 by means of four spaced bolts 87. Certain of the bolts 87 extends through areas where the rocker arm shafts 67 and 73 also extend. In order to prevent interference, the rocker arm shafts are relieved in these areas as seen at 88 in Figure 2. In like manner, the exhaust rocker arm shaft 73 extends through the spark plug recess 77 and to prevent interference, a portion 89 of this rocker arm shaft is removed or relieved so as to permit the spark plug 76 to be inserted and removed without interference. As a result, the construction can be extremely compact and yet there is no sacrifice made for the good operation of the components or the ability to service them.
  • the bearing cap, cam cover 59 is provided with an upwardly extending lug portion 89 which is generally bifurcated to pass one of the hold-down bolts 87.
  • This bifurcated lug 89 is formed with a pair of aligned bores through which a first bolt and nut assembly 91 extends so as to attach a pair of engine mounts 19 to the engine.
  • a second bolt and nut assembly 92 passes through another series of holes in the engine mounts 19 so as to secure the engine mounts 19 and engine to the frame cross member or gusset 21, as aforedescribed.
  • the engine has been provided with a single spark plug for each cylinder or combustion chamber.
  • a single spark plug for each cylinder or combustion chamber.
  • plural spark plugs are advantageous to insure that the entire charge in the cylinder will be burned even under high speed running. By using multiple spark plugs, it is possible to insure that this result is obtained.
  • spark plugs 102 and 103 there are provided two diametrically positioned spark plugs 102 and 103.
  • the spark plug 102 is positioned in a spark plug recess 104 that is formed in the timing cover portion of the engine and passes between the flights of the drive chain 85.
  • the spark plug 103 is disposed beyond the end of the camshaft 55 and is provided within a spark plug well 105 formed in this portion of the cylinder head.
  • this embodiment is the same as the previously described embodiment, and for that reason further description of it is believed to be unnecessary to permit those skilled in the art to practice the invention.
  • the bridging member 86 does not extend to the spark plug recess 77 because of the different placement of the spark plugs. However, the bridging member 86 still acts to reinforce the cylinder head as in the previously described embodiment.
  • an intake rocker arm shaft 151 and exhaust rocker arm shaft 152 are supported and journaled by means of bearing caps 153, 154 and 155 which are affixed to the cylinder head 34 in a conventional manner.
  • the exhaust rocker arm shaft 152 can be positioned more inwardly from the spark plug recess 77 and it is not necessary to relieve the exhaust rocker arm shaft 152 for this reason.
  • the camshaft 55 is provided with spaced bearing portions that are journaled in the bearing caps 153, 154 and 155 in a more conventional manner.
  • the camshaft 55 is provided with a thrust shoulder 156 that cooperates with thrust taking surfaces of the bearing cap 154 so as to take axial thrusts on the camshaft 55.
  • the camshaft 55 is provided with a pair of intake lobes 157 that are disposed generally adjacent each other and a pair of exhaust lobes 158 that are disposed ouwardly of the intake lobes 157.
  • a single intake rocker arm 159 for each cylinder has a pair of follower portions 161 that engage the intake cam lobes 157.
  • the rocker arm 159 also has three extending arm portions 162, each of which operates a respective one of the intake valves.
  • a single exhaust rocker arm 163 that has a pair of follower portions 164 that are engaged with the exhaust cam lobes 158.
  • This rocker arm also has a pair of finger portions 165 that carry adjusting screws that cooperate with the exhaust valve stems to actuate them.
  • this embodiment is the same as those previously described.
  • Figure 11 shows yet another embodiment of the invention which is generally similar to the embodiment of Figures 9 and 10 and which can be utilized in conjunction with a multiple cylinder engine.
  • This embodiment differs from the embodment of Figures 9 and 10 only in that the rocker arms associated with the intake valves only have a single follower portion 201 that is engaged with a single cam lobe 202 on the camshaft 55 for operating the intake valves 38 and 39.
  • this embodiment is the same as previously described embodiment and those components which are the same or substantially the same have been identified by the same reference numerals and further description of them and of this embodiment is not believed necessary to enable those skilled in the art to make and use the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
EP89119004A 1989-10-12 1989-10-12 Brennkammer und Ventilsteuervorrichtung für Mehrventil-Brennkraftmaschine Expired - Lifetime EP0422277B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP89119004A EP0422277B1 (de) 1989-10-12 1989-10-12 Brennkammer und Ventilsteuervorrichtung für Mehrventil-Brennkraftmaschine
DE1989613740 DE68913740T2 (de) 1989-10-12 1989-10-12 Brennkammer und Ventilsteuervorrichtung für Mehrventil-Brennkraftmaschine.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP89119004A EP0422277B1 (de) 1989-10-12 1989-10-12 Brennkammer und Ventilsteuervorrichtung für Mehrventil-Brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP0422277A1 true EP0422277A1 (de) 1991-04-17
EP0422277B1 EP0422277B1 (de) 1994-03-09

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EP89119004A Expired - Lifetime EP0422277B1 (de) 1989-10-12 1989-10-12 Brennkammer und Ventilsteuervorrichtung für Mehrventil-Brennkraftmaschine

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DE (1) DE68913740T2 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4323073A1 (de) * 1993-07-10 1995-01-12 Audi Ag Hubkolben-Brennkraftmaschine
EP0433728B1 (de) * 1989-11-29 1995-03-08 Yamaha Hatsudoki Kabushiki Kaisha Zylinderkopf und Ventilanordnung für Mehrventil-Brennkraftmaschine
DE19745715A1 (de) * 1997-10-16 1999-04-22 Daimler Chrysler Ag Vorrichtung zur variablen Steuerung der Ventile einer Brennkraftmaschine
DE19833199A1 (de) * 1998-07-23 2000-01-27 Audi Ag Zylinderkopfhaube einer Brennkraftmaschine
EP1046804A1 (de) * 1999-04-22 2000-10-25 Nissan Motor Company, Limited Zylinderkopf einer Brennkraftmaschine
EP1460238A2 (de) * 2003-03-18 2004-09-22 HONDA MOTOR CO., Ltd. Brennkraftmaschine mit obenliegender Nockenwelle

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8166949B2 (en) * 2010-05-17 2012-05-01 GM Global Technology Operations LLC Cylinder head dry valley drain

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0187287A2 (de) * 1984-12-10 1986-07-16 Mazda Motor Corporation Brennkraftmaschine
US4624222A (en) * 1984-04-11 1986-11-25 Yamaha Hatsudoki Kabushiki Kaisha Intake valve structure for internal combustion engine
EP0144179B1 (de) * 1983-11-25 1988-02-10 Honda Giken Kogyo Kabushiki Kaisha Mehrventilbrennkraftmaschine
GB2193998A (en) * 1986-07-09 1988-02-24 Honda Motor Co Ltd Spark plug lead arrangement in overhead camshaft i.c engines

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EP0144179B1 (de) * 1983-11-25 1988-02-10 Honda Giken Kogyo Kabushiki Kaisha Mehrventilbrennkraftmaschine
US4624222A (en) * 1984-04-11 1986-11-25 Yamaha Hatsudoki Kabushiki Kaisha Intake valve structure for internal combustion engine
EP0187287A2 (de) * 1984-12-10 1986-07-16 Mazda Motor Corporation Brennkraftmaschine
GB2193998A (en) * 1986-07-09 1988-02-24 Honda Motor Co Ltd Spark plug lead arrangement in overhead camshaft i.c engines

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Publication number Priority date Publication date Assignee Title
EP0433728B1 (de) * 1989-11-29 1995-03-08 Yamaha Hatsudoki Kabushiki Kaisha Zylinderkopf und Ventilanordnung für Mehrventil-Brennkraftmaschine
DE4323073A1 (de) * 1993-07-10 1995-01-12 Audi Ag Hubkolben-Brennkraftmaschine
DE19745715A1 (de) * 1997-10-16 1999-04-22 Daimler Chrysler Ag Vorrichtung zur variablen Steuerung der Ventile einer Brennkraftmaschine
DE19833199A1 (de) * 1998-07-23 2000-01-27 Audi Ag Zylinderkopfhaube einer Brennkraftmaschine
DE19833199B4 (de) * 1998-07-23 2006-09-28 Audi Ag Zylinderkopfhaube einer Brennkraftmaschine
EP1046804A1 (de) * 1999-04-22 2000-10-25 Nissan Motor Company, Limited Zylinderkopf einer Brennkraftmaschine
US6209506B1 (en) 1999-04-22 2001-04-03 Nissan Motor Co., Ltd. Cylinder head for internal combustion engine
EP1460238A2 (de) * 2003-03-18 2004-09-22 HONDA MOTOR CO., Ltd. Brennkraftmaschine mit obenliegender Nockenwelle
EP1460238A3 (de) * 2003-03-18 2005-08-24 HONDA MOTOR CO., Ltd. Brennkraftmaschine mit obenliegender Nockenwelle

Also Published As

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DE68913740T2 (de) 1994-06-23
DE68913740D1 (de) 1994-04-14
EP0422277B1 (de) 1994-03-09

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