Abstract: In a V-type engine, intake and exhaust rocker arms in each bank are arranged in a substantially inverted-V-shape in a plan view, so that side end portions of corresponding intake and exhaust push rods are positioned adjacent to each other. Slipper portions of first and second intake cam followers have end portions at one end along the axial direction of a camshaft protrude respectively in opposite directions to each other so that they face each other across an intake cam therebetween. Slipper portions of first and second exhaust cam followers have end portions at one end along the axial direction of the camshaft protrude respectively in opposite directions to each other so that they face each other across an exhaust cam therebetween. This reduces the distance between the push rods in each bank to provide a compact valve-operating device.

Abstract: A V-type engine includes: first and second banks which are arranged in a V-shape and which respectively have cylinder bores; a crankshaft which is shared by the first and second banks; a crankcase which supports the crankshaft, the first and second banks being connected to the crankcase; and a valley portion which is defined between the first and second banks, an engine auxiliary machine being disposed in the valley portion. The first and second banks are arranged so that a cylinder center line of the first bank and a cylinder center line of the second bank respectively pass through a point which is eccentric from a rotational center of the crankshaft to a side opposite from both the banks. Thus, it is possible to improve an auxiliary machine housing function of the valley portion defined between the first and second banks while maintaining a predetermined opening angle therebetween.

Abstract: An information processing apparatus for realizing coexistence of a high-speed editing function for contents whose copyright is protected and a defending function for limitless movement due to alteration of the contents and a defending function for an illegal process using power-off. When the contents constructed on a block unit basis is received and division-edited, block unique information as unique information corresponding to each divided block is formed. Apparatus unique information to specify the apparatus is recorded into a memory or the like. A Hash value which is formed from the formed block unique information and the apparatus unique information which has previously been stored in the memory or the like is stored.

Abstract: An engine includes a cylinder head having a valve-operating chamber. A cylinder head is coupled to a cylinder block by a plurality of fastening bolts. A head cover is coupled to the cylinder head to close the valve-operating chamber. A ventilating gap is defined between a face of the cylinder head fastened by the fastening bolts and a bottom wall of the valve-operating chamber. An operating bore is provided in the bottom wall to enable insertion of at least one of the fastening bolts and a tool for tightening the fastening bolt. A plug is integrally provided in the head cover to be liquid-tightly fitted into the operating bore. Cooling of portions around the bottom wall of the valve-operating chamber is improved, while the cylinder head can be fastened to the cylinder block from the side of the valve-operating chamber by the fastening bolts.

Abstract: In an engine operated machine system including a hollow support rod connected at one end to an engine through a vibration insulator, an auxiliary weight is mounted at the other end of a crankshaft for generating a centrifugal force in the same direction as an inertia force of a piston, when the piston reaches top and bottom dead centers. Thus, it is possible to bring a center of gravity of the engine closer to the position of the vibration insulator, thereby suppressing the application of the vibration from the engine to the support rod to the utmost.

Abstract: A crankcase is coupled to a lower end face of a cylinder block of an engine and includes first and second case halves coupled to each other in a plane perpendicular to joint surfaces of the cylinder block and the crankcase. A U-shaped seal groove is defined in one of the joint surfaces of the case halves. Enlarged recesses are made at opposite ends of the seal groove. A bar-shaped seal member having enlarged end portions formed at opposite ends thereof is mounted in the groove such that the enlarged end portions are filled in the enlarged recesses. Thus, it is possible to ensure accuracy of the positioning of the bar-shaped seal member without the need for a high level skill; thereby, reliably sealing portions of intersection between the joint surfaces of the cylinder block and the crankcase and the joint surfaces of the case halves of the crankcase.

Abstract: An engine includes a cylinder head having a valve-operating chamber. A cylinder head is coupled to a cylinder block by a plurality of fastening bolts. A head cover is coupled to the cylinder head to close the valve-operating chamber. A ventilating gap is defined between a face of the cylinder head fastened by the fastening bolts and a bottom wall of the valve-operating chamber. An operating bore is provided in the bottom wall to enable insertion of at least one of the fastening bolts and a tool for tightening the fastening bolt. A plug is integrally provided in the head cover to be liquid-tightly fitted into the operating bore. Cooling of portions around the bottom wall of the valve-operating chamber is improved, while the cylinder head can be fastened to the cylinder block from the side of the valve-operating chamber by the fastening bolts.

Abstract: In a valve-operating assembly of a driven rotation member and a cam, including a hub rotatably carried on a support shaft, a cam formed on an outer periphery of one end of the hub, and a driven rotation member coupled to one end of the cam; the cam and the hub are integrally formed of a sintered alloy; the cam has a recess defined in one end face thereof; and the driven rotation member is made of a synthetic resin, and mold-coupled to the cam and the hub so that the recess is filled with the synthetic resin of the driven rotation member and an outer periphery of the hub is wrapped with the synthetic resin. Thus, it is possible to provide the valve-operating assembly of the driven rotation member and the cam, which is lightweight and excellent in lubrication of the cam and the hub.

Abstract: A valve-operating mechanism includes cam followers carried on an engine body 1 with their tip ends being in sliding contact with the cam, rocker arms integrally connected to the cam followers and carried on the engine body coaxially with said cam followers with their tip ends being connected to valves, and valve springs for biasing the valves in closing directions. In the valve-operating mechanism, auxiliary springs are connected to the cam followers for biasing and turning the cam followers in the same directions as directions in which the valve springs bias and turn the rocker arms through the valves. Thus, a couple of forces generated over the axis of the cam follower and the rocker arm due to biasing force of the valve spring can be offset in a valve-closing process.

Abstract: In a system for lubricating a valve-operating mechanism in an engine including a head cover coupled to an upper end of a cylinder head, and a valve-operating chamber defined between the cylinder head and the head cover. An oil mist transfer means for transferring an oil mist in an oil tank, an oil recovery chamber for recovering the oil accumulated in the valve-operating chamber by suction and a breather chamber into which a blow-by gas is introduced from the valve-operating chamber lead to the valve-operating chamber. In the lubricating system, a gas-liquid separating chamber for separating oil drops from the oil mist fed from the transfer means to guide the oil mist containing no oil drops to the valve-operating chamber is disposed between the transfer means 61 and the valve-operating chamber. Thus, the oil mist containing no oil drops can be supplied to the valve-operating chamber to lubricate the valve-operating mechanism without a resistance.

Abstract: In a handheld type four-cycle engine, a valve operation mechanism includes a camshaft rotatably supported in a cylinder head so as to open and close an intake valve and an exhaust valve and a timing transmission placed on one side outside an engine main body and providing association between a crankshaft and the camshaft, and a centrifugal clutch for power output is mounted on the crankshaft on the opposite side outside the engine main body. The timing transmission and the centrifugal clutch being positioned at the two ends of the crankshaft improves the weight balance, the centre of gravity of the engine can be made as close to the central part of the crankshaft as possible, which, together with the reduced weight, can enhance the operability of the engine.

Abstract: In a handheld type four-cycle engine, a valve operation mechanism includes a camshaft rotatably supported in a cylinder head so as to open and close an intake valve and an exhaust valve and a timing transmission placed on one side outside an engine main body and providing association between a crankshaft and the camshaft, and a centrifugal clutch for power output is mounted on the crankshaft on the opposite side outside the engine main body. The timing transmission and the centrifugal clutch being positioned at the two ends of the crankshaft improves the weight balance, the centre of gravity of the engine can be made as close to the central part of the crankshaft as possible, which, together with the reduced weight, can enhance the operability of the engine.

Abstract: In an engine operated machine system including a hollow support rod connected at one end to an engine through a vibration insulator, an auxiliary weight is mounted at the other end of a crankshaft for generating a centrifugal force in the same direction as an inertia force of a piston, when the piston reaches top and bottom dead centers. Thus, it is possible to bring a center of gravity of the engine closer to the position of the vibration insulator, thereby suppressing the application of the vibration from the engine to the support rod to the utmost.

Abstract: In a working engine including a bearing mounted on an outer wall of a crankcase for carrying a crankshaft, an oil seal mounted on the outer wall of a crankcase and disposed outside and adjacent the bearing, and a cooling fan which is attached to an outer end of the crankshaft adjacent the oil seal with its blades turned toward the crankcase and which has blades protruding toward the crankcase, a cylindrical protective tube is formed on an outer sidewall of the crankcase to cover ends of bosses of the cooling fan, and a foreign matter-beating piece is formed on the cooling fan 16 in proximity to an outer peripheral surface of the protective tube. Thus, even if a long foreign matter drawn in by the cooling fan such as a weed and the like has been entangled around the crankshaft, it can be beaten and loosened, or cut by the foreign matter-beating piece rotated along with the cooling fan.

Abstract: An engine head cover structure has a head cover joined to the upper end of a cylinder head so as to define a valve operation chamber therebetween. The head cover includes therein an oil recovery chamber to which oil resided in the valve operation chamber is recovered by suction and a breather chamber that removes blowby gas from the valve operation chamber being provided in the head cover. The breather chamber is defined between a partition plate mounted on an inner wall of the head cover via clips and a surface of the roof of the head cover, and the oil recovery chamber is defined between the partition plate and a partition body welded thereto. It is thus possible to form the oil recovery chamber and the breather chamber without splitting the roof of the head cover, thereby making inspection of the joint for oil tightness unnecessary.

Abstract: In a handheld type four-cycle engine, a valve operation mechanism includes a camshaft rotatably supported in a cylinder head so as to open and close an intake valve and an exhaust valve and a timing transmission placed on one side outside an engine main body and providing association between a crankshaft and the camshaft, and a centrifugal clutch for power output is mounted on the crankshaft on the opposite side outside the engine main body. The timing transmission and the centrifugal clutch being positioned at the two ends of the crankshaft improves the weight balance, the centre of gravity of the engine can be made as close to the central part of the crankshaft as possible, which, together with the reduced weight, can enhance the operability of the engine.

Abstract: In a handheld type four-cycle engine, a valve operation mechanism includes a camshaft rotatably supported in a cylinder head so as to open and close an intake valve and an exhaust valve and a timing transmission placed on one side outside an engine main body and providing association between a crankshaft and the camshaft, and a centrifugal clutch for power output is mounted on the crankshaft on the opposite side outside the engine main body. The timing transmission and the centrifugal clutch being positioned at the two ends of the crankshaft improves the weight balance, the centre of gravity of the engine can be made as close to the central part of the crankshaft as possible, which, together with the reduced weight, can enhance the operability of the engine.

Abstract: A seal structure in an engine, including a seal member interposed between a cylinder head having a slanting face portion at least at an intermediate portion of its upper end face to which a valve-operating cam chamber opens, and a head cover coupled to the upper end face of the cylinder head by a bolt to close the valve-operating cam chamber. The head cover has a fit wall portion formed thereon and fitted to an inner peripheral surface of the valve-operating cam chamber, and the seal member is mounted in a seal groove provided in an outer peripheral surface of the fit wall portion to come into close contact with an inner peripheral surface of the cylinder head. Thus, an interference can be provided equally at various portions of the seal member irrespective of the number of bolts used, and the seal member can always exhibit a good seal function.

Abstract: In a valve-operating mechanism in a 4-cycle engine, a timing transmitting device is disposed on one side of an engine body. A cam device includes a cam coupled to a driven pulley of the timing transmitting device on one side of a cylinder head, intake and exhaust rocker shafts rotatably carried in the cylinder head, intake and exhaust cam followers secured to one ends of the rocker shafts with their tip ends in sliding contact with the cam, and intake and exhaust rocker arms secured to the other ends of the intake and exhaust rocker shafts with their tip ends abutting against the intake and exhaust valves. Thus, the cam of the cam device can be disposed on one side of the cylinder head to effectively reduce the entire height of the engine.

Abstract: In a system for lubricating a valve-operating mechanism in an engine including a head cover coupled to an upper end of a cylinder head, and a valve-operating chamber defined between the cylinder head and the head cover. An oil mist transfer means for transferring an oil mist in an oil tank, an oil recovery chamber for recovering the oil accumulated in the valve-operating chamber by suction and a breather chamber into which a blow-by gas is introduced from the valve-operating chamber lead to the valve-operating chamber. In the lubricating system, a gas-liquid separating chamber for separating oil drops from the oil mist fed from the transfer means to guide the oil mist containing no oil drops to the valve-operating chamber is disposed between the transfer means 61 and the valve-operating chamber. Thus, the oil mist containing no oil drops can be supplied to the valve-operating chamber to lubricate the valve-operating mechanism without a resistance.