Abstract: A polishing device for a welding tip includes a cylindrical holder; and a polishing unit. The polishing unit includes a blade configured to polish a welding tip. The blade polishes the welding tip due to rotation of the polishing unit. The holder includes a groove extending along an entire inner circumference of the holder. The groove includes axial groove portions each of which extends along an axis of the holder, and inclined groove portions each of which extends for a specified first distance and is inclined in one direction with respect to the axial groove portions. The axial groove portions and the inclined groove portions are alternately arranged. The polishing unit includes projected portions each of which extends to an inside of the groove, and the number of the projected portions is two or more and is equal to or less than the number of the axial groove portions.

Abstract: A polishing device for a welding tip includes a cylindrical holder; and a polishing unit. The polishing unit includes a blade configured to polish a welding tip. The blade polishes the welding tip due to rotation of the polishing unit. The holder includes a groove extending along an entire inner circumference of the holder. The groove includes axial groove portions each of which extends along an axis of the holder, and inclined groove portions each of which extends for a specified first distance and is inclined in one direction with respect to the axial groove portions. The axial groove portions and the inclined groove portions are alternately arranged. The polishing unit includes projected portions each of which extends to an inside of the groove, and the number of the projected portions is two or more and is equal to or less than the number of the axial groove portions.

Abstract: A torch ignition type internal combustion engine with no intake valve in the auxiliary combustion chamber, the engine comprising: a cylinder; a cylinder head; a reciprocating piston received snugly in the cylinder; a main combustion chamber defined between said cylinder head and an end face of the reciprocating piston and having intake and exhaust valves to control intake and exhaust ports in the cylinder head; an auxiliary combustion chamber provided in the head of the cylinder; a passage interconnecting said main and auxiliary combustion chambers; and an ignition plug having sparking electrodes located in said passage; the auxiliary combustion chamber having a volume of a ratio within the range of 0.0106:1 to 0.0137:1 with respect to the volume of displacement of the piston, the passage having a cross-sectional area of a ratio within the range of 0.009:1 to 0.023:1 with respect to the cross-sectional area of the end face of the piston and the engine having a compression ratio within the range of 8.0 to 9.5.

Abstract: Disclosed is an internal combustion engine comprising a main combustion chamber and an auxiliary combustion chamber which are interconnected to each other via a connecting passage. The auxiliary combustion chamber symmetrically extends about an axis. The opening of the connecting passage is arranged on the periphery of the inner wall of the cylinder head and is directed in the circumferential direction of the inner wall of the cylinder head. A swirl motion creating means is provided for creating a swirl motion of the combustible mixture which rotates about the axis of the auxiliary combustion chamber at the time of the compression stroke. The spark gap of the spark plug is located on the axis of the auxiliary combustion chamber and in the deep interior of the auxiliary combustion chamber.

Abstract: An internal combustion engine comprising a subsidiary combustion chamber connected to a main combustion chamber via a connecting passage. The subsidiary combustion chamber is divided into a first chamber and a second chamber by an annular raised portion formed on the subsidiary combustion chamber. The connecting passage communicates the main combustion chamber with the first chamber for leading a combustible mixture from the main combustion chamber into the first chamber and is arranged so as to create a swirl motion of the combustible mixture in the first and the second chambers. When the combustible mixture is ignited, the annular raised portion serves to prevent outflow of an unburned mixture from the second chamber to the first chamber.

Abstract: Disclosed is an internal combustion engine with an auxiliary combustion chamber having an exhaust gas recirculating device for recirculating the exhaust gas from the exhaust system into the intake system. The auxiliary combustion chamber is connected only to the main combustion chamber via at least two connecting passages. The connecting passages are arranged so that the combustible mixture introduced into the auxiliary combustion chamber from the main combustion chamber via one of said connecting passages strengthens the swirl motion of the mixture created by the combustible mixture introduced into the auxiliary combustion chamber from the main combustion chamber via the other connecting passage.

Abstract: Apparatus for feeding water to the air/fuel mixture passage between the air/fuel mixing device and combustion chamber of an internal combustion engine including a main conduit for supplying water to the mixture passage, a valve member for opening and closing the conduit, the valve member being biased into the closed position, a diaphragm communicating on one side directly to the mixture passage for actuating the valve member to an open position and on the other side through a pressure delay chamber with the mixture passage, wherein the conduit is opened only by a relatively abrupt increase in pressure in the mixture passage, and the closing is delayed until the pressure equalizes across the diaphragm. Water may be supplied to the conduit directly by a pump, or by a pressure differential or by means of a reservoir having access to a water supply.

Abstract: A torch ignition type internal combustion engine has a precombustion chamber formed in a cylinder head in communication with a main combustion chamber through a passage so that a part of a lean air-fuel mixture is forced into the precombustion chamber on compression stroke. A spark plug is mounted on the cylinder head to ignite the lean air-fuel mixture in the precombustion chamber so that the ignited air-fuel mixture is burnt therein to form a torch jet which runs from the precombustion chamber through the passage into the main combustion chamber to ignite the lean air-fuel mixture therein. The spark plug has an insulator extending at one end axially beyond that end face of a metal shell of the spark plug from which grounded electrodes extend. The one end of the insulator supports a center electrode.

Abstract: An internal combustion engine of the type having a main combustion chamber and an auxiliary combustion or precombustion chamber intercommunicated through a passage with the former for burning a lean fuel-air mixture in order to reduce the harmful emissions. The shape of the main combustion chamber, the intake port and the intake valve are so designed that a substantial portion of the lean mixture may be directed toward the apex of the spherical inner surface of the dome-shaped main combustion chamber an flow therealong so as to form intensive swirls.

Abstract: A torch ignition type internal combustion engine with no intake valve in the auxiliary combustion chamber, the engine comprising: a cylinder; a cylinder head; a reciprocating piston received snugly in said cylinder; a main combustion chamber defined between said cylinder head and an end face of said reciprocating piston and equipped with intake and exhaust valves to control intake and exhaust ports in the cylinder head; an auxiliary combustion chamber provided in the head of said cylinder; a passage interconnecting said main and auxiliary combustion chambers; and an ignition plug having sparking electrodes located in said passage; said auxiliary combustion chamber having a volume of a ratio within the range of 0.0106:1 to 0.0137:1 with respect to the volume of displacement of said piston and said passage having a cross-sectional area of a ratio within the range of 0.009:1 to 0.023:1 with respect to the cross-sectional area of said end face of said piston.