Abstract: A push rod includes a rod body and a steel ball bonded to at least one of end faces of the rod body by an electric resistance welding. The rod body 2 is formed from an aluminum alloy. Thus, it is possible to provide a push rod which is lightweight and which can be produced at an inexpensive cost.

Abstract: An intake cam and an exhaust cam are formed integrally with a cam shaft, and a decompression cam is additionally provided adjacently to the front side of the exhaust cam. A rib is formed in back of the intake cam. A cylindrical surface portion having a diameter being the same as that of the outer periphery surface of a ball bearing for supporting the front portion of the cam shaft and being larger than the diameter of the base circle of the cam shaft, is formed on the front crank case, and a locking stepped portion is formed in back of the cylindrical surface portion. Cutout portions are formed in the locking stepped portion so that the cam shaft can be pulled forward in the state that the intake cam, exhaust cam and the decompression cam are arranged.

Abstract: In an automatic decompression device for an engine, having a decompression cam supported on a camshaft adjacent to a valve operating cam for movement between a biased valve opening position in which the decompression cam causes a cam surface to project beyond a base circle portion of the valve operating cam to bias open an exhaust valve or an intake valve in a compression stroke of the engine, and a retracted position in which the decompression cam retracts the cam surface inwardly of the base circle portion of the valve operating cam under centrifugal forces acting on the counterweight against spring forces of a spring when the engine operates at a relatively high rotational speed, to prevent oil from being trapped between the decompression cam and the camshaft and allow the decompression cam to operate smoothly to decompress the engine when the engine starts at low temperatures.

Abstract: A power unit for a vehicle constructed by combining an internal combustion engine and a transmission integrally is provided. A crankshaft rotatably supported in front and rear crankcases of the internal combustion engine is positioned biased slightly toward right side from the center of the crankcases, a cylinder block and a cylinder head is inclined toward the left so as to extend obliquely leftward and upward from the crankshaft, on the left side of the crankshaft are arranged a main shaft and an auxiliary shaft of the transmission in turn, at a middle and upper portion between the main and auxiliary shafts a reverse shaft, and below the auxiliary shaft a driving shaft. On the right side of the crankshaft is arranged a cam shaft. These shafts are parallel with each other and directed in the vehicle running direction.

Abstract: Recessed portions extending in the direction of the cam shaft from the opposed edges of the intake cam and the exhaust cam are respectively formed on the base circles of the intake cam and the exhaust cam of the cam shaft. Moreover, projecting ribs crossing a predetermined circumference of the cam shaft, having rib end portions directed toward the recessed portions, and extending in the rotational direction of the cam shaft, are radially projectingly provided on the cam shaft adjacent to the recessed portions.

Abstract: A process for producing hydrogen peroxide by subjecting a working solution containing anthraquinones as the reaction medium, to reduction and oxidation alternately, which process is characterized in that (1) the anthraquinones as the reaction medium contained in the working solution are a mixture of an alkyl-substituted anthraquinone and an alkyl-substituted tetrahydroanthraquinone, (2) in the reduction step, the total amount of the alkyl-substituted tetrahydroanthraquinone in the working solution and part or the total amount of the alkyl-substituted anthraquinone in the working solution are reduced, and (3) in the working solution after the reduction step, the content of the alkyl-substituted anthrahydroquinone formed is kept higher than the content of the alkyl-substituted tetrahydroanthrahydroquinone formed.

Abstract: This invention provides a process for producing hydrogen peroxide through catalytic reaction of oxygen with hydrogen in an aqueous medium in the presence of a platinum group metal catalyst, in which an organic solvent having only limited solubility with water and less hydrogen peroxide-dissolving ability compared to that of water is caused to be concurrently present in the reactor, and oxygen and hydrogen are catalytically reacted in an aqueous medium in the presence of a water- and organic solvent-insoluble, hydrophilic platinum group metal catalyst, under a low reaction pressure, to form high concentration aqueous hydrogen peroxide solution within a short time.

Abstract: The present invention provides a process for producing hydrogen peroxide by reacting oxygen and hydrogen in a reaction medium catalytically using, as a catalyst, a tin-modified platinum group metal supported on a carrier. In the process using said catalyst, the presence of halogen and acid in reaction medium is unnecessary unlike the prior art methods, and hydrogen peroxide of high concentration can be produced efficiently. Thus, the present process has no restriction for reactor material as seen the prior art methods and further allows for easy purification of produced hydrogen peroxide.

Abstract: A method for producing a high concentration of hydrogen peroxide by reacting oxygen and hydrogen directly in a neutral reaction medium that contains a promoter comprising a halogen containing compound, which halogen containing compound contains at least one halogen other than fluorine, at a reaction temperature in the range of from 0.degree. to 50.degree. C. and at a reaction pressure in the range of from 3 to 150 kg/cm.sup.2 .multidot.G in the presence of a platinum group metal catalyst supported on a catalyst carrier containing a heteropolyacid that has been made insoluble in water or a platinum group metal catalyst supported on a catalyst carrier comprising activated carbon that is supporting a heteropolyacid.

Abstract: Oxygen and hydrogen are catalytically reacted in an acidic reaction medium in the presence of a platinum group metal catalyst to prepare hydrogen peroxide using as a carrier for the platinum group metal catalyst a composite oxide containing cerium. The process need not halogen ions in the acidic reaction medium and enables preparation of hydrogen peroxide in high concentration on an industrial scale advantageously.

Abstract: A method for producing a high concentration of hydrogen peroxide by reacting oxygen and hydrogen directly in a reaction medium containing a promoter such as a halogen containing compound using a platinum group metal catalyst supported on a solid acid carrier or a solid super acid carrier.

Abstract: This invention provides a method for high efficiency, high concentration production of hydrogen peroxide wherein oxygen and hydrogen are reacted in the reaction medium in the presence of a catalyst comprising a metallic or carrier supported platinum group metal catalyst onto which an organic halogen compound which is insoluble in water, which compound excludes compounds which contain no halogen other than fluorine, has been adsorbed or a platinum group metal catalyst supported on a carrier in which a halogenated organic compound, which compound excludes compounds that contain no halogen other than fluorine, has been adsorbed to the carrier prior to supporting the platinum group metal. Since it is not necessary for halogen ions to be present in the reaction medium as it was in the prior art, the problems of deterioration due to the dissolution of the catalyst and of corrosion of the structural materials of the reaction vessel are alleviated.

Abstract: A method for producing hydrogen peroxide by the reaction of hydrogen and oxygen in the reaction medium in the presence of a platinum group metal catalyst supported on a halogenated resin, in which, since there are no halogen ion nor high concentrations of acid in the reaction medium of this invention as there are in prior art methods, the problems of dissolution of catalyst and corrosion of the reaction vessel are solved.

Abstract: A process for producing quinones corresponding to anthracenes or alkylnaphthalenes in high yields and selectivities, which comprises reacting the anthracenes or alkylnaphthalenes with hydrogen peroxide in the liquid phase in the presence of hydrogen chloride as a catalyst. Methanol, for example, may be used as a reaction medium.