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
  • F02F1/42—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
• • 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
• • 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
  • F01L1/022—Chain drive
• • 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
  • F01L1/024—Belt drive
• • 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
• • 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
• • 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
  • F02B61/02—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving cycles
• • 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
  • F02B75/00—Other engines
  • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
  • F02B75/18—Multi-cylinder engines
  • F02B75/22—Multi-cylinder engines with cylinders in V, fan, or star arrangement
• • 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
  • F02B75/00—Other engines
  • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
  • F02B75/18—Multi-cylinder engines
  • F02B75/24—Multi-cylinder engines with cylinders arranged oppositely relative to main shaft and of "flat" type
  • F02B75/243—Multi-cylinder engines with cylinders arranged oppositely relative to main shaft and of "flat" type with only one crankshaft of the "boxer" type, e.g. all connecting rods attached to separate crankshaft bearings
• • 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
  • F01L2001/0535—Single overhead camshafts [SOHC]
• • 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
• • 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
  • F02B75/00—Other engines
  • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
  • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
  • F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four
• • 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
  • F02B75/00—Other engines
  • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
  • F02B75/18—Multi-cylinder engines
  • F02B2075/1804—Number of cylinders
  • F02B2075/1808—Number of cylinders two
• • 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
  • 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

• the invention relates to a two-cylinder four-stroke boxer engine of a type according to the features specified in the preamble of claim 1.
• a known Boxernotcr of this type according to DE-OS 27 03 520 has a relatively jagged outer shape, which is derived in particular from the arrangement of the valves and their drive. This is because the intermediate shaft for driving the two overhead camshafts is arranged above the crankshaft and the chain and belt drives extend with separate covers arranged at a distance from the cylinders and cylinder heads to control housings projecting from the cylinder head. The arrangement of parallel inlet and outlet valves also contributes to the asymmetrical and jagged structure of this boxer gate. In addition, the housing parts, which protrude considerably beyond the basic contour of the cylinders and cylinder heads, also result in high construction costs with a correspondingly high weight.
• the object of the invention is to avoid the aforementioned disadvantages and on the basis of the known type
• the invention provides an arrangement according to the characterizing part of patent claim 1.
• the valve drive including the oil pump drive, requires an extremely small amount of space due to these features, without housing parts or covers projecting from the basic contour of the engine components.
• the valve, camshaft and gas exchange duct arrangements likewise lead to a very compact overall construction of the boxer engine with guides of the intake and exhaust systems closely fitting to the outer contours on the top and bottom of the cylinders and cylinder heads.
• the last-mentioned arrangements are further favored, so that the intake systems on the top of the cylinders and cylinder heads approach both sides even closer and have an even smaller space requirement overall, while the exhaust pipes on the underside of the cylinders and cylinder heads more space is provided for routing the exhaust pipes to the center of the vehicle, which benefits the ground clearance of motorcycles.
• the use of two inlet valves and a Auslrittven tiles according to claim 3 allows compared to an inlet and outlet valve larger valve time cross-sections with a relatively small V-angle of the valves, which further benefits the aforementioned spatial advantages and also increases or extends the performance and speed range of the engine as well as a different partial load control of both inlet channels.
• the arrangement of the intake valves according to claim 4 results in a favorable position for the combustion process and maintenance of the spark plugs in the center of the combustion chamber or on the top of the cylinder heads, without reducing the aforementioned advantages.
• the lever arm of the compensation funds is relatively large, which means that they can be kept small and thus the overall engine weight is reduced.
• the features of claim 10 result in an arrangement of the closure cover for an oil filter, which avoids an otherwise usual jagged outer wall part with jewelry.
• the accessibility for changing the oil filter is still unchanged because the bulkhead cover usually has to be removed anyway in order to check other auxiliary units during maintenance work.
• the feature of claim 12 results in a space requirement of the spark plug, which avoids an excessive distance between the inlet valves and their valve springs. It can be advantageously used both in the boxer engine according to claim 4 and in the cylinder head according to claim 11.
• FIG. 1 is a longitudinal sectional view of a two-cylinder four-stroke boxer engine for motorcycles, air-cooled and air-cooled, with a hollow sheet metal frame flanged to the top of the crankcase in a schematic representation;
• FIG. 2 is a partially sectioned end view according to arrow II in Fig. 1,
• FIG. 3 shows the partially sectioned top view according to line III-III in FIG. 2,
• FIG. 4 shows the interior view of the combustion chamber in the cylinder head with valve and spark plug arrangement according to the line IV-IV in FIG. 3,
• Fig. 5 is a plan view of the open valve control along the line V-V in Fig. 3 and
• FIG. 6 shows the longitudinal section through the cooling air duct in the cylinder head along the line VI-VI in FIG. 3rd
• An air-cooled air-cooled two-cylinder four-stroke boxer engine 1 has a crankcase 2 which is divided in its vertical longitudinal center plane I-I.
• the longitudinal section is accordingly formed in the region of the crankcase by omitting one half.
• both a one-piece crankshaft 3 and an intermediate shaft 4 are mounted in plain bearings.
• the crankshaft 3 carries a flywheel 5 at its output end and a generator 6 and a toothed belt wheel 7 for the 1: 2 reduced drive connection by means of a toothed belt 8 and a further toothed belt wheel 9 to the intermediate shaft 4 at its opposite front end.
• crankshaft 3 each a relatively narrow washer shaped balancing mass 11, which are arranged in correspondingly narrow annular spaces 2 'of the crankcase 2 between the main bearings 10 and subsequent shaft seals 10'. Due to the relatively large distance between the balancing masses 11, their balancing function is strengthened or their weight is reduced. The arrangement of the distance between the main bearings 10 and thus the weight of the crankcase 2 is reduced.
• the intermediate shaft 4 drives both a lubricating oil pump 12, of which a pump wheel 12 ′ is fastened to the intermediate shaft 4, and also two chain drives 13, each for an overhead camshaft 14.
• a lubricating oil pump 12 of which a pump wheel 12 ′ is fastened to the intermediate shaft 4, and also two chain drives 13, each for an overhead camshaft 14.
• the filter insert 16 of which is accessible for maintenance work through an inner cover 17.
• the cover 17, the toothed belt drive 7, 8 and 9 and the generator 6 are protected against environmental influences by a largely smooth-faced end wall cover 18, which at the same time promotes cleaning of the end surface of the crankcase 2.
• the flywheel 5 is framed by a mounting flange 19 for the connection of a gear housing, not shown.
• a circumferential fastening flange 20 with a number of fastening eyes 21 for fastening screws 22 is integrally formed on the upper side of the crankcase 2, with which a frame sheet metal hollow body 23 is screwed.
• a crankcase ventilation opening 24 opens out from the upper side of the crankcase 2 framed by the fastening flange 20.
• the frame sheet metal hollow body 23 connects the crankcase 2 on a broad, rigid base to a control head 25 of a motorcycle.
• the frame sheet metal hollow body 23 On its front side, the frame sheet metal hollow body 23 carries an intake air filter 26 through which the filtered intake air flows through openings 27 into the interior of the Rahraen sheet metal hollow body 23.
• This serves as Intake chamber for the combustion air of the engine and contains length-matched intake pipes 28, each of which feeds the combustion air to a carburetor 29.
• the carburetors 29 are partially inside indentations 30 of the frame sheet metal hollow body 23, which has sealed through openings 31 for the passage of the intake pipes 28 within the indentations 30.
• a cylinder 32 is flanged on both sides of the crankcase 2, and a cylinder head 33, each with a cylinder head cover 34, is flanged to each of these.
• Cylinder 32, cylinder head 33 and cylinder head cover 34 have numerous cooling fins 35 for airflow air cooling. They also each contain a tunnel 36 for receiving the chain drives 13, which extend from the intermediate shaft 4 in the crankcase 2 to the camshafts 14 in the cylinder heads 33, viewed in the direction of travel, on the back of the cylinders 32 and the cylinder heads 33.
• the chain drives 15 have a 1: 1 transmission, as a result of which small chain wheels 13 'can be used both on the intermediate shaft 4 and on the camshafts 14.
• valve control for two intake valves 37 and an exhaust valve 3S by means of three rocker arms 39 as transmission elements from the camshaft 14 to the valves 37 and 38 in contrast, has a somewhat larger side projection, so that the cylinder head cover 34 has a non-protruding outer shape rounded on all sides have. This favors both their external appearance and their easy cleaning, as well as the small overall width of the boxer engine and also the motorcycle equipped with it (Fig. 2 and 3).
• the valves 37 and 38 are arranged in the vertical V position.
• Each of the two inlet valves 37 are parallel lel to each other corresponding to a V-leg, which is determined by the plane of the two inlet valves 37 and - seen towards the shaft end of the inlet valves 37 - has an upward inclination of approximately 37 °.
• the V-leg determined by the outlet valves 38 has a corresponding downward inclination of approximately 15 °.
• the camshafts are each in an angle bisecting position within the approx. 52 ° V position of the valves 37 and 38.
• the rocker arms 39 for driving a valve 37 or 38 are rotatably arranged on bearing axes 40.
• Their pivot pin 41 are arranged eccentrically to their fixed bearing pin 42 for valve clearance adjustment (Fig. 2 and 5).
• Their fixed bearing journals 42 can be fixed in a non-rotatable manner in bearing seats 44 of the cylinder head 33 which can be clamped by means of screws 43.
• the bearing axles 40 have a key profile formed on an accessible front end, which cannot be seen in the drawing. An inner profile is preferred because it does not require space and saves weight as a material recess. Overall, the valve control requires little space and construction and does not contain any additional moving parts for valve clearance adjustment.
• valve plates 37 'and 38' of the inlet 37 and the outlet valves 38 are almost tangentially close to the associated contour 32 'of the associated cylinder 32 and at a relatively close distance between the valve plate 37' and each valve plate 38 '.
• the spark gap of the spark plug 45 is located centrally between the valves 37 and 38 in the combustion chamber 46.
• a large squish surface 47 can be formed, which in cooperation with a flat bottom portion of a piston 48
• the spark plug 45 is arranged at a steeper inclination than the inlet valves 37 in the vertical plane 49 together with the outlet valve 38.
• the installation space requirement of the spark plug does not therefore come between the space requirement of the valve springs 50 of the inlet valves 37.
• the spark plugs and their electrical connections are particularly easy to access for maintenance.
• an open horizontal cooling air duct 51 is formed, as seen in the direction of travel. This ends at its end opposite to the direction of travel in a vertical outflow shaft 52 which is arranged in front of the tunnel 36 of the chain drive 13 and is open at the top and bottom.
• a favorable space-saving arrangement results from the valve arrangement described above also for the intake manifold 28 'with the carburetors 29 and for the exhaust pipes 53. While the suction system on the top of the engine leans closely against the hollow sheet metal frame 23 and thereby has a small width sufficient space is available for routing the exhaust pipes 53 with relatively large, low flow resistance radii, without impairing the freedom from ground and lean positions for motorcycle driving.
• the overall structure of the two-cylinder, four-stroke boxer engine according to the invention results, especially for use in motorcycles, in a summation of mutually complementary advantages in terms of high performance, effective cooling, good running properties, low weight and construction costs, low space requirements and an appealing external shape. However, most of these advantages also come into play in stationary and / or enclosed applications with forced air or liquid cooling.

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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)
• Combustion Methods Of Internal-Combustion Engines (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6135396

Family Applications (1)

Country Status (5)

Families Citing this family (15)

Citations (5)

Family Cites Families (31)

• 1981
  • 1981-06-26 DE DE19813125077 patent/DE3125077A1/de not_active Withdrawn
• 1982
  • 1982-06-18 DE DE8282105324T patent/DE3262212D1/de not_active Expired
  • 1982-06-18 DE DE8383112438T patent/DE3273260D1/de not_active Expired
  • 1982-06-18 EP EP83112438A patent/EP0113450B1/de not_active Expired
  • 1982-06-18 EP EP82105324A patent/EP0068336B1/de not_active Expired
  • 1982-06-24 US US06/474,595 patent/US4558676A/en not_active Expired - Fee Related
  • 1982-06-24 JP JP57501940A patent/JPS58501045A/ja active Granted
  • 1982-06-24 WO PCT/EP1982/000133 patent/WO1983000188A1/en unknown

Patent Citations (5)

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