Abstract: A combustion-type power tool includes a frame comprising a housing having one end, and a head portion disposed at the one end, and a piston reciprocally movably disposed in the housing. A combustion chamber is provided in the housing and has one end movable toward and away from the head portion and another end defined by the piston. A motor is provided and has a motor case disposed opposite to the combustion chamber with respect to the head portion, a buffer member is provided which supports the motor and has a part located between the motor case and the head portion.

Abstract: An engine is cooled using high pressure water injected into the piston with the water converted to high pressure steam by the heat from combustion with heat transfer taking place in passages in the piston and in and between grooves in the piston and the cylinder sleeve. The high pressure steam is conducted between the piston and cylinder walls to lubricate, so there will be no need for piston rings, with a part of it passing into the crankcase, and a part of it going into the combustion chamber where it contributes to power production. The piston skirt has a spring-loaded washer access to a void in a lower passage for balancing pressures.

Abstract: A valve stem seal of an internal combustion engine is described wherein the valve stem seal includes an outer peripheral surface and an inner sealing surface. The inner sealing surface minimizes ingress of a liquid upwardly from an intake port area into an overhead engine area by having at least one sealing lip disposed on an upper portion of the inner sealing surface and extending away from the inner sealing surface. The sealing lip includes a generally square lower corner.

Abstract: An engine coolant pump drive system for a vehicle having an engine, an engine coolant system, and at least one sensor for sensing at least one operational condition of the vehicle is disclosed. The pump drive system includes a magnetorheological fluid (MRF) clutch, and a coolant pump. The MRF clutch includes a torque input section coupled to a torque output section via a MRF, the torque input section being configured to receive a torque input from the engine. The coolant pump is configured for operable communication with the torque output section of the MRF clutch. In response to a signal from the at least one sensor, the MRF clutch is configured to provide a continuously variable torque transfer from the torque input section to the torque output section, thereby providing for variable coolant flow in the engine coolant system via the coolant pump capable of a continuously variable speed.

Abstract: A balancer apparatus including a first balancer and a second balancer. The first balancer includes a first balance weight and the second balancer includes a second balance weight and wherein the first and second balance weights are asymmetrical. The first and second balancers include first and second center of gravities that are longitudinally aligned when the first and second balancers are assembled in a housing.

Abstract: The motor according to the present invention consists of a piston (1), cylinder (2), connecting rod (3), connecting rod rotary bolt gear wheel (4), connecting rod rotary bolt (5), crank shaft (6), crank shaft bolt (7), double faced gear wheel (9) and other gear wheels (10, 11, 12). As the connecting rod (3) is moved by the connecting rod rotary bolt gear wheel (4) that moves together with the connecting rod rotary bolt (5), without being directly dependent on the movement of the crank shaft bolt (7) although the connecting rod (3) is connected to the crank shaft (6) and to the piston (1); the crank shaft (6) moves independently of the connecting rod (3). This provides the difference between the travel path of the piston (1) between the lower and upper dead points, and the rotational diameter of the crank shaft bolt (7). In this case, the connecting rod (3) makes an elliptical movement on the crank shaft bolt (7) instead of a circular movement.

Abstract: The object of the present invention is to provide a premixed charge compression ignition (PCCI) engine. The PCCI engine has a fuel injector (22) in a suction manifold (8) to prepare a premixed charge of fuel and air and induces a natural ignition of the premixed charge in a combustion chamber (20) of a high temperature and high pressure. The PCCI engine further includes a structurally improved connecting rod which has a spring operated in organic conjunction with the other elements of the PCCI engine. The present invention further provides a PCCI reciprocating generator that is fabricated by a combination of a reciprocating generator unit with the PCCI engine, so that the PCCI reciprocating generator operates with improved operational efficiency. In the present invention, two PCCI engines may be arranged to symmetrically face each other, thus providing a multiple PCCI engine.

Abstract: An integrated speed changer assembly for increasing or decreasing the rotational speed of the output of an engine, or other prime mover, to that required by the input of a process machine. The assembly includes a housing, a flywheel assembly, an internal ring gear and a pinion. The housing has a shaft opening and a flywheel opening. The flywheel assembly is coupled to the crankshaft of an engine and positioned to substantially cover the flywheel opening of the housing. In an integrated speed increaser embodiment, the internal ring gear is coupled to the flywheel assembly and has ring gear teeth on its inner surface and is positioned concentric with the flywheel assembly for rotation therewith. The pinion has a driven shaft that extends axially and which projects through the shaft opening of the housing. The pinion has pinion gear teeth on its outer surface which are suited for meshing engagement with the ring gear teeth of the internal ring gear.

Abstract: A lower link for an engine piston crank mechanism includes first and second half members joined by bolts to form a crankpin bearing portion. The first half member includes a first pin boss portion to connect the lower link with a first link which is one of an upper link connected with a piston and a control link having one end mounted swingably on the engine. The second half member includes a second pin boss portion to connect the lower link with a second link which is the other of the upper link and the control link, and an internally threaded portion into which one bolt is screwed. The second half member further includes a load transfer portion which is made greater in rigidity than the internally threaded portion.

Abstract: A lower link for a piston crank mechanism of an internal combustion engine includes an upper section, a lower section, and a crank pin bearing section disposed between the upper section and the lower section, and mounted on a crank pin of a crank shaft. One of the upper section and the lower section is formed with a bolt inserting hole. The other of the upper section and the lower section is formed with an internal thread portion including an open end. One of the bolts passes through the bolt inserting hole, is screwed into the internal thread portion, and includes an end bared from the open end which is formed in a surface perpendicular to a bolt center axis. The other of the upper section and the lower section includes a recessed portion formed in the surface to divert a stress transmitting path.

Abstract: An air cleaner chamber is configured such that a filtering member is held between an air cleaner cover and an air cleaner case. A low-speed operation air intake passage and a high-speed operation air intake passage share an outlet passage portion near a dusty space, and are molded integrally on the air cleaner case using a synthetic resin. A passage switching valve is disposed so as to switch an aperture area of the high-speed operation air intake passage. In addition, a valve actuator for driving the passage switching valve is mounted to the air cleaner case.

Abstract: A valve system for a combustion engine that includes at least one combustion chamber is disclosed. The combustion chamber includes an intake port and an exhaust port. The valve system includes cylindrical valve shaft, the cylindrical valve shaft having a cylindrical surface, a central axis along the cylindrical valve shaft and containing at least two recessed areas, the recessed areas being at one hundred eighty degrees to one another along the axis of the valve shaft, the recessed areas extending approximately ninety degrees about the axis and along the cylindrical surface, or about 25 percent of the surface.

Abstract: An engine lubrication method is provided. The four-cycle engine has a lightweight aluminum alloy engine block having a cylindrical bore and an enclosed oil reservoir formed therein. A crankshaft is rotatably mounted in the engine block for rotation about a crankshaft axis. A piston reciprocates within the bore and is connected to the crankshaft by a connecting rod. An oil pump driven by the cam gear, which mates with crank gear that is driven by crank shaft, inhales the oil from the oil reservoir to splash lubricate into the cylinder bore. The engine is provided with a cylinder head assembly defining a compact combustion chamber having a pair of overhead intake and exhaust ports and cooperating intake and exhaust valves. A lightweight, high-powered engine is thereby provided having relatively low HC and CO emissions. A circular arc wall surrounds around web of the crankshaft with a slight distance from the web.

Abstract: In one particular embodiment, an internal combustion engine is provided. The engine comprises a block, a head, a piston, a combustion chamber defined by the block, the piston, and the head, and at least one thermoelectric device positioned between the combustion chamber and the head. In this particular embodiment, the thermoelectric device is in direct contact with the combustion chamber. In another particular embodiment, a cylinder head configured to sit atop a cylinder bank of an internal combustion engine is provided. The cylinder head comprises a cooling channel configured to receive cooling fluid, valve seats configured for receiving intake and exhaust valves, and thermoelectric devices positioned around the valve seats.

Abstract: There is provided a structure for connecting a piston to a crankshaft in an internal combustion engine, including a piston pin fitted into the piston, a crankpin integral with the crankshaft and a connecting rod having a piston pin bearing portion slidably engaged with an outer cylindrical portion of the piston pin and a crankpin bearing portion slidably engaged with an outer cylindrical portion of the crankpin. At least one of the piston pin bearing portion of the connecting rod and the outer cylindrical portion of the piston pin and at least one of the crankpin bearing portion of the connecting rod and the outer cylindrical portion of the crankpin have hard carbon coatings formed thereon with a hydrogen content of 20 atomic % or less.

Abstract: A fuel injection system includes (i) an injector for injecting gaseous fuel and liquid fuel into a cylinder of an internal combustion engine, (ii) a gaseous fuel supplying unit having a gaseous feel tank as a first high-pressure accumulating source for pressurizing gaseous fuel, (iii) a liquid fuel supplying unit having a common rail as a second high-pressure accumulating source for pressurizing liquid fuel; (iv) a fuel pump as a pressure feeding unit that pressure feeds liquid fuel to the common rail; and (v) a compressor as a pressure increasing unit, which is operated under pressure of the pressurized gaseous fuel to increase pressure of liquid fuel pressure fed from the fuel pump.

Abstract: An intake module (1) for an internal combustion engine including a plurality of intake tracts (2, 3, 4, 5) in each of which two intake pipe openings (21, 22; 31, 32; 41, 42; 51, 52) are formed. One of the intake pipe openings (21, 31, 41, 51) in each intake tract has a constant cross section, and the second intake pipe opening has a flow cross section which can be varied depending on the operating mode of the engine. The two intake pipe openings in each intake tract are separated from each other by a partition (23, 33, 43, 53) which is inserted into a housing (6) in which the intake tracts (2, 3, 4, 5) are formed, and a movable component (7) is mounted on each of the partitions (23, 33, 43, 53) for varying the flow cross section of the second intake pipe opening (22, 32, 42, 52) of the respective intake tract.

Abstract: The invention provides a method and construction of vibration control supporting a cooling fan cover.

Abstract: Disclosed is a self-priming portable powered device such as a tool, comprising a housing within which are defined a priming combustion chamber and a main combustion chamber, within which chambers during operation of the device there is a combustion of a combustible fuel and a combustion-supporting gas; and wherein a combustion event in the priming combustion chamber causes the formation of a mixture of fuel and combustion-supporting gas in the main combustion chamber which is compressed at a pressure above ambient pressure, subsequent combustion of the compressed mixture in the main combustion chamber acting on a work piston which, directly or indirectly, performs the intended task.

Abstract: A supplementary slurry fuel atomizer of this invention, when used on a piston internal combustion engine, equipped with a common rail fuel injection system, improves slurry atomization, following injection, by expansion of gases, previously dissolved in the water phase of the slurry. This gas expansion separates the several fuel particles in each slurry droplet formed first during fuel injection. The thusly separated fuel particles subsequently burn more rapidly and completely, due to this fuel particle separation improving air access to the fuel. Apparatus is described for dissolving atomizing gas into the water phase of the slurry, in a contactor chamber at a pressure greater than the pressure prevailing in the engine cylinder volume, at the time of slurry injection.