Internal-combustion engines – Particular piston and enclosing cylinder construction – Cylinder detail
Reexamination Certificate
2001-07-19
2002-08-27
Nguyen, Hoang (Department: 3748)
Internal-combustion engines
Particular piston and enclosing cylinder construction
Cylinder detail
C060S605100
Reexamination Certificate
active
06439188
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is generally related to an internal combustion engine with balance shafts and, more particularly, to a four cylinder four cycle in-line engine with a supercharging device in which two rotors of the supercharging device are provided with counterweights to balance the effect of secondary forces experienced by the engine.
2. Description of the Prior Art
Those skilled in the art of internal combustion engine design are familiar with many different types of balance shaft configurations used in internal combustion engines. Those skilled in the art of engine design are familiar with many different types of supercharging devices that utilize rotors. A Roots blower is one of several types of supercharging devices that employ two rotors.
U.S. Pat. No. 6,205,970, which issued to Iwata et al on Mar. 27, 2001, describes an engine balance shaft supporting structure. A casing accommodating therein a pair of balance shafts below the cylinder block comprises an upper casing and a lower casing that can vertically be split, and an oil pump body molded integrally with one of the upper and lower casings. In addition, one end of each of the two casings is inserted into the oil pump body for support therein and the two balance shafts are each supported on a bearing provided between the two casings in such a manner as to be split into two halves at the intermediate portion of the other end thereof.
U.S. Pat. No. 4,028,963, which issued to Nakamura et al on Jun. 14, 1977, describes an engine balancer. Balancer shafts are provided on the right and left of the crankshaft of an engine and so as to be driven thereby. Each balancer shaft has a balance weight divided into two portions, one on either side of a bearing supporting the balancer shaft. This construction protects the bearings from undesirable wear.
U.S. Pat. No. 6,189,499, which issued to Iwata et al on Feb. 20, 2001, describes a balancing device for a reciprocating engine. The balancing device for a reciprocating engine is provided which is improved so as not to disturb the compactification of an engine. There is provided a balancing device for a reciprocating engine comprising two balance shafts, gear connected to each other, a chain/sprocket mechanism for coupling at least one of the balance shafts with a crankshaft in an interlocking fashion, a chain tensioner for automatically adjusting the tension of the chain and a pump receiving portion integrally provided in a balance shaft holder for supporting the balance shafts for receiving a rotor of a lubricating oil pump, the balancing device being characterized in that the rotor of the lubricating oil pump is directly connected to the other balance shaft, and that the chain tensioner is disposed on a shaft end side of the other balance shaft.
U.S. Pat. No. 4,703,725, which issued to Weertman on Nov. 3, 1987, describes the mounting of an engine balancing device. An engine balance device utilizing rotating balance shafts is mounted in a housing means beneath the crankshaft and attached to the engine block by a plurality of legs spaced in the direction of the crankshaft axis to engage bearing journals located between cylinder bores. An oil pumping means evacuates oil from the housing means in cooperation with vacuum formation preventing air bleed means to the housing interior.
U.S. Pat. No. 4,819,505, which issued to Takubo et al on Apr. 11, 1989, describes balancer shafts for use in multicylinder engines. A balancer shaft for use in a multicylinder engine comprises a balance weight part formed to be eccentric in relation to a rotation axis of the balancer shaft and disposed along the alignment of cylinders in a cylinder block, an elongated shaft part extending from the balance weight part along the alignment of cylinders, a driving device provided on an end portion of the elongated shaft part for transmitting the rotation of a crankshaft in the cylinder block to the balancer shaft, a first journal provided on the end portion of the elongated shaft part, a second journal provided on a central portion of the balance weight part, and a third journal provided on an end portion of the balance weight part. The journals are supported by bearing portions provided in the cylinder block.
U.S. Pat. No. 5,253,547, which issued to Yoneyama et al on Oct. 19, 1993, describes a balancer device for an in-line engine. A balancer device is installed to an in-line engine comprising a balance shaft which includes first and second journals at which the balance shaft is supported through first and second bearings. The first bearing is disposed near the front part of the engine and set in a retainer for rotatably fixing the balance shaft. The second bearing is disposed near a generally center portion in the axial direction of the crankshaft and secured to a cylinder block. A pair of unbalanced portions are disposed near the second journal. The diameter of the first journal is formed smaller than that of the second journal to suppress the friction loss of the first journal.
U.S. Pat. No. 5,850,764, which issued to Bostelmann et al on Dec. 22, 1998, describes a crankshaft drive for an internal combustion engine. The crankshaft rotates at a predetermined direction and at a predetermined speed and a balance shaft extends parallel to the crankshaft and rotates at the predetermined speed of the crankshaft in a direction opposite to the predetermined rotating direction of the crankshaft. The crankshaft and the balance shaft carry balance weight means for balancing a mass of first order. An auxiliary shaft extends parallel to the crankshaft and rotates at the predetermined speed of the crankshaft in the predetermined rotating direction of the crankshaft. The auxiliary shaft carries a counterweight for balancing a residual moment resulting from the rotating balance shaft with respect to the rotating crankshaft.
U.S. Pat. No. 5,065,644, which issued to Shimada on Nov. 19, 1991, describes a counterbalance mechanism for an internal combustion engine. The engine has a crankshaft, a clutch, and a transmission including a main shaft rotatable by the crankshaft through the clutch and a countershaft rotatable by the main shaft through gears. A counterbalance mechanism includes at least a primary counterweight rotatable in synchronism with the crankshaft and a hollow shaft rotatably supported concentrically on the main shaft. The primary counterweight is integrally mounted on the hollow shaft. The clutch is corotatably mounted on the hollow shaft and operatively coupled to the crankshaft at the same speed as and in the opposite direction to the crankshaft.
U.S. Pat. No. 5,960,761, which issued to Kawakubo et al on Oct. 5, 1999, describes an engine with a balancer device for a vehicle. In order to suitably keep the weight balance of an engine while reducing a radial dimension of an engine, the crankshaft and a transmission shaft are supported in casings and are disposed to be substantially parallel to each other. A rear balancer and a front balancer are disposed with the crankshaft placed therebetween. An AC generator is disposed at an end portion of the crankshaft on the left side with respect to a plane passing through a center of gravity of an engine and being perpendicular to the crankshaft. A clutch is disposed at an end portion of the transmission shaft on the right side with respect to the plane. The clutch is separated from the plane at a distance smaller than that between the AC generator and the plane, so that the weight balance of the engine is suitably maintained by disposing the rear balancer and the front balancer on the clutch side.
U.S. Pat. No. 4,813,857, which issued to Kawakami on Mar. 21, 1989, describes a Roots blower. In a Roots blower having a casing, two rotors rotatably housed within the casing, and at least two grease-enclosing bearing units to rotatably support the rotors, the invention is characterized by a bypass groove which is formed for each of the bearing units so as to communicate between a first chamber defined by the casing and t
Brunswick Corporation
Lanyi William D.
Nguyen Hoang
LandOfFree
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