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
  • F01L1/02—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
  • F01L1/12—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
  • 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
  • F01L2001/0537—Double overhead camshafts [DOHC]
• • 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
  • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
  • F01L2003/25—Valve configurations in relation to engine
  • F01L2003/256—Valve configurations in relation to engine configured other than perpendicular to camshaft axis

Definitions

• the invention relates to an internal combustion engine comprising a crankshaft and at least one at least approximately in Kurbelwellenachsinspired from an inlet to an exhaust port through-flow cylinder head with valves for opening and closing the channels.
• Such an internal combustion engine is known for example from DE 38 41 710 A1, according to which a single camshaft with an inlet cam and an exhaust cam is provided for actuating the valves.
• the valves are actuated by means of rocker arm shafts lying parallel to the valve levels, in each case one cam activating two (inlet or outlet) valves simultaneously via a rocker arm shaft.
• the cam engages one end of the rocker arm shaft
• the levers for actuating the valves are arranged along the rocker arm shaft in Kipphebelwellenachsraum spaced from the cam follower lever.
• the invention is therefore based on the object to provide an aforementioned engine, in which a valve control for controlling a plurality of arranged in a cylinder head valves occupies only a small installation space and which at the same time offers a particularly direct and rigid transmission path, so high especially at high valve accelerations Speeds are achievable.
• a motor vehicle is to be provided with such an internal combustion engine.
• valves are actuated directly by means of drag lever, a direct actuation of the valves by means of bucket tappets is also preferred.
• inlet and outlet valves (e) are inclined outwards with respect to a center plane dividing the cylinder in the direction of flow, with their ends on the cam side.
• the cylinder head can then be designed as a radial head, so that in particular space advantages can be achieved, for example, so space can be obtained to accommodate an ignition coil.
• the first and second camshaft and the bucket tappets are arranged in a structurally separate carrier, so that the valve train is structurally separate from the valves.
• the first and the second camshaft and the drag levers are arranged with cam follower shaft (s) in a structurally separate carrier.
• Figure 1 is a crankshaft axis of an inlet to a
• FIG. 2 shows the same cylinder head in plan view
• Figure 4 the same cylinder head with valve control carrier.
• FIGS. 1-4 a cylinder head 100, 200, 300 through which an intake passage 102, 202, 302, 402 can flow in the crankshaft axis direction to an exhaust passage 112, 212, 312, 412 is equipped with two crankshaft-parallel camshafts 126, 226, 227, 326, 327, 426, 427, in FIG. 4 with valve control carrier 400.
• FIG. 1 shows a side view
• FIG. 2 shows a plan view
• FIGS. 3 and 4 are isometric views.
• the cylinder head 100, 200, 300 is part of a not shown here two-cylinder internal combustion engine in boxer design, which is preferably used to drive a motorcycle.
• the internal combustion engine is arranged in the vehicle aligned with its crankshaft in the vehicle longitudinal direction.
• Each cylinder head 100, 200, 300 is at least approximately in the crankshaft axis direction of a directed to the vehicle rear inlet 102, 202, 302, 402 to a vehicle front-facing outlet channel 112, 212, 312, 412 flowed through.
• inlet 102, 202, 302, 402 and outlet channel 112, 212, 312, 412 are each represented by the volume enveloped by the channel wall.
• Actuation thereof is effected by means of camshafts 126, 226, 227, 326, 327, 426, 427 driven by the crankshaft.
• the camshafts 126, 226, 227, 326, 327, 426, 427 each have one Drive wheel 128, 328, 329, which is driven by means of a traction means, starting from the crankshaft.
• only one camshaft 126, 226, 227, 326, 327, 426, 427 may be driven from the crankshaft and the camshafts 126, 226, 227, 326, 327, 426, 427 may be in driving connection with each other.
• the drive of one of the two camshafts 126, 226, 227, 326, 327, 426, 427 may be switchable, so that the corresponding valves 104, 114, 204, 205,
• the camshafts 126, 226, 227, 326, 327, 426, 427 are each provided with two cams 110, 120, 210, 220, 310, 320 and 211, 221, 311, 321, so that in each case with a camshaft 126, 226, 227, 326, 327, 426, 427 an inlet 104, 204, 205, 304, 305, 404, 405 and an outlet valve 114, 214,
• a force / motion transmission from the cams 110, 120, 210, 211, 220, 221, 310, 311, 320, 321 to the valves 104, 114, 204, 205, 214, 215, 304, 305, 314, 315, 404, 405, 414, 415 takes place over a short path directly via rocker arms 108, 118, 208, 209, 218, 219, 308, 318, 408, 418 which pivotable on rocker arm shafts 122, 124, 222, 223, 224, 225, 322nd , 324, 422, 424 are stored.
• cams 110, 120, 210, 211, 220, 221, 310, 311, 320, 321 and valves 104, 114 , 204, 205, 214, 215, 304, 305, 314, 315, 404, 405, 414, 415, bucket tappets, optionally with a valve lash adjuster, may be provided.
• the inlet and outlet valves 104, 114, 204, 205, 214, 215, 304, 305, 314, 315, 404, 405, 414, 415 are outwardly inclined with respect to a central plane dividing the cylinder in the flow direction, with their camming ends pointing outwards the cylinder head 100, 200, 300 as Radial cylinder head can be shown.
• the drag levers 108, 118, 208, 209, 218, 219, 308, 318, 408, 418 with their cam follower shafts 122, 124, 222, 223, 224, 225, 322, 324, 422, 424 are inclined (FIGS ) and the cams 110, 120, 210, 211, 220, 221, 310, 311, 320, 321 have inclined cam surfaces.
• valve timing drive comprising the camshafts 126, 226, 227, 326, 327, 426, 427 and the cam followers 108, 118, 208, 209, 218, 219, 308, 318 with their cam follower shafts 122, 124, 222, 223, 224, 225 , 322, 324, 422, 424 is arranged in a structurally separate valve control carrier 400.
• the valve control carrier 400 is divided into two parts along a parting plane 441 and comprises a lower part 440 and an upper part 442.
• the parting plane 441 runs in the camshaft plane at least approximately in the region of the camshaft axes, so that during assembly the camshafts can be inserted into the lower part 440 and subsequently the Upper part 442 can be mounted.
• Upper and lower parts 442, 440 are repeatedly screwed together by means of screws 448, 449 with each other and / or with the cylinder head, wherein in the present case, the screws 448, 449 are arranged in pairs opposite one another along the camshaft.
• the upper part 442 is executed hood-like closed in the area of the camshafts 426, 427, while the area between the camshafts 426, 427 is open at the top.
• the lower part 440 includes laterally cylindrical receptacles 444, 446.
• the cam follower shafts 422, 424 are inserted and secured there by means of axial securing rings 423, 425.
• the valve control carrier 400 is manufactured in aluminum die-cast and post-machined. Cylinder head and timing gear can therefore be edited and assembled separately and then joined together, which offers considerable manufacturing and assembly or maintenance benefits. With the internal combustion engine according to the invention high speeds can be achieved at the same time high valve acceleration and it can be manufactured inexpensively, in particular due to the small number of components.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Valve-Gear Or Valve Arrangements (AREA)
• Cylinder Crankcases Of Internal Combustion Engines (AREA)
• Valve Device For Special Equipments (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Related Child Applications (1)

Publications (1)

Family

ID=39745003

Family Applications (1)

Country Status (6)

Families Citing this family (6)

Citations (4)

Family Cites Families (12)

• 2007
  • 2007-07-11 DE DE102007032638A patent/DE102007032638A1/de not_active Withdrawn
• 2008
  • 2008-06-11 WO PCT/EP2008/004646 patent/WO2009006973A1/de not_active Ceased
  • 2008-06-11 ES ES08759163.2T patent/ES2556730T3/es active Active
  • 2008-06-11 EP EP08759163.2A patent/EP2162601B1/de active Active
  • 2008-06-11 JP JP2010515359A patent/JP5484322B2/ja active Active
• 2009
  • 2009-11-09 US US12/614,875 patent/US8307798B2/en active Active

Patent Citations (4)

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