Internal-combustion engines – Charge forming device – Supercharger
Reexamination Certificate
2001-09-28
2002-06-25
Denion, Thomas (Department: 3748)
Internal-combustion engines
Charge forming device
Supercharger
C123S559100, C123S0650WA, C123S311000, C123S564000, C060S599000, C417S406000, C440S08800J, C440S08900C
Reexamination Certificate
active
06408832
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is generally related to an outboard motor with a supercharger and, more particularly, to an outboard motor having a screw compressor which provides pressurized charge air for the engine.
2. Description of the Prior Art
Superchargers used in conjunction with internal combustion engines are well known to those skilled in the art. In automobile applications, both Roots compressors and screw compressors have been used to provide pressurized charge air for the engine. U.S. Pat. No. 5,332,376, which issued to Lindbrandt on Jul. 26, 1994, describes a screw compressor for use with an internal combustion engine. The screw compressor, especially adapted for use as a supercharger for an internal combustion engine, comprises a housing having a barrel section preferably made from aluminum and two end sections, in which housing a pair of screw rotors are mounted. The end sections are provided with projections inserted into the end portions of the barrel section by forced fit between surfaces of the projections. The end portions of the barrel section are also secured to the barrel section by screw joints.
U.S. Pat. No. 5,241,817, which issued to George, Jr. on Sep. 7, 1993, describes a screw compressor with regenerative braking. A screw engine for propelling a wheeled vehicle via a continuously variable transmission is characterized by a ceramic screw compressor and a ceramic screw expander mounted on a common shaft of the continuously variable transmission. The compressor compresses air and delivers it to a combustion chamber. The air is mixed with fuel in the chamber and ignited to produce combustion products. The combustion products are expanded by the expander to produce a work output for driving the continuously variable transmission and an exhaust output. A heat exchanger is connected with the expander to recover heat from the exhaust output.
U.S. Pat. No. 4,802,457, which issued to Oscarrson on Feb. 7, 1989, describes an internal combustion engine provided with a supercharger. In a conventional throttle-controlled internal combustion engine equipped with a supercharger, a compressor is provided with screw rotors arranged in a compression chamber. The supercharger is inactive at part engine loads. Since the engine normally operates at part loads for about 95% of its running time, efficiency is correspondingly poor. This drawback is overcome with the arrangement according to the invention in which a screw compression is provided on the inlet side thereof with a capacity regulating device which is opened by a gas pedal, or accelerator, and which when the engine is only partially loaded, is adjusted to a corresponding position in which the compressor operates as an expander of variable throttle effect on the engine inlet side and transmits power to the engine, thereby replacing the conventional gas throttle.
U.S. Pat. No. 5,293,846, which issued to Takahashi on Mar. 15, 1994, describes a two-cycle engine for an outboard motor. The outboard motor includes a supercharged internal combustion engine. The supercharger is positioned on a side of the crankcase opposite from the cylinders of the engine and is driven by the crankshaft through any of the plurality of different forms of drive arrangements that permit axial adjustment to maintain alignment.
U.S. Pat. No. 5,239,950, which issued to Takahashi on Aug. 31, 1993, describes a 2-cycle engine. A number of embodiments of outboard motors embodying pressure scavenged 2-cycle internal combustion engines is described. In each embodiment, a plenum chamber serves the scavenge passages of the engine and the pressure relief for a scavenge pump is provided by a pressure relief valve in the plenum chamber so as to reduce the opening and closing of the pressure relief valve due to pulsations caused by the engine operation. In one embodiment, the pressure is relieved by discharging the air to the exhaust system for silencing and also for cooling the exhaust gases. In other embodiments, the air for pressure relief is discharged to the atmosphere.
U.S. Pat. No. 3,808,807, which issued to Lanpheer on May 7, 1974, discloses a tuning arrangement for an outboard motor. The improvement in the exhaust system for a two-cycle engine comprising one or more sets of three cylinders connected to the crank shaft 120° apart is disclosed. The exhaust ports of the engine communicate with a common exhaust chamber formed in association with the cylinder block. A diverging passage leading from the common exhaust chamber to a spacious exhaust tube enclosed within the drive shaft housing produces a negative pressure from a cylinder's positive exhaust pulse, which negative pressure aids in scavenging the cylinder. The geometry of the diverging passage and the exhaust tube are such that a positive pulse is created by the exit of the negative pulse from the diverging passage and propagates back through the diverging passages arriving at the exhaust ports of the cylinder simultaneously with a positive pulse from the subsequently fired cylinder to aid in supercharging.
U.S. Pat. No. 4,827,722, which issued to Torigai on May 9, 1989, describes an engine with a turbo-charger for an outboard motor. The outboard motor has a turbo-charged internal combustion engine as a power device. The engine is provided with a plurality of carburetors that draw air through a common plenum chamber. The turbo-chargers deliver pressurized air to the plenum chamber and an intercooler is formed in the plenum chamber by having a heat exchanger extending across the plenum chamber. The intercooler is cooled by circulating engine coolant through it.
U.S. Pat. No. 5,261,356, which issued to Takahashi et al on Nov. 16, 1993, describes an outboard motor. A supercharged outboard motor includes a water cooling jacket that encircles the supercharger and also the duct which interconnects the supercharger with the engine for cooling of the supercharger and compressed air charge without necessitating a separate intercooler.
U.S. Pat. No. 3,813,880, which issued to Reid et al on Jun. 4, 1974, discloses an exhaust tuning system for two-stroke engines. A two-stroke multiple cylinder engine includes a pair of exhaust chambers having a common control wall and each of which is connected between a corresponding plurality of selected cylinders and a common exhaust passageway. The connection between each of the chambers and the passageway is defined by a tuning section which is constructed of a sufficient length and configuration to generate a negative pressure pulse to aid scavenging and reflected positive pulses from the fired cylinder. In addition, the next fired cylinder of each group establishes super-charging of the engine. The common wall of the two tuned passageways is provided with a transfer port for transferring of a positive pressure signal from the one passageway into the opposite passageway which travels back toward the engine to provide a further positive supercharging pulse to the opposite exhaust chamber. The feedback pressure wave can be applied with particular advantage to four and two cylinder engines.
U.S. Pat. No. 5,921,220, which issued to Kato on Jul. 13, 1999, and describes an engine feedback control system. The system is intended for use with an internal combustion engine having at least two combustion chambers. When a sensor detects a high engine temperature condition of the engine, the feedback control changes the air/fuel ratio of the air and fuel supplied to each combustion chamber in a manner that prevents operation of any combustion chamber in a disabling range.
When superchargers are used in conjunction with an internal combustion engine, they are typically used to provide additional power at high loads and engine speeds. In other words, at high engine speeds, the supercharger provides additional pressurized charge air to increase the horsepower output of the engine to a magnitude greater than would than otherwise be achievable without the use of a supercharger. At lower engine speeds, the supercharger is typicall
Brunswick Corporation
Denion Thomas
Lanyi William D.
Trieu Thai-Ba
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