Abstract: A hydraulically operative clutch type transmission especially for industrial and loading vehicles comprises a casing accommodating shift gear mechanism therein, a housing connected to the casing, an input shaft journalled to the housing, a main shaft connected to the input shaft, a gearing member, a hydraulically operative clutch device which comprises a clutch drum connected to the main shaft and a clutch hub connected to the gearing member, a washer plate interposed between the gearing member and sleeve end of the clutch drum, the main shaft including a large diameter portion having a notch with a plain surface, and a small diameter portion, a gear member of the gearing member being rotatably supported on the large diameter portion, the clutch drum mounted on the small diameter portion, and the washer plate including a fasting portion which is engaged with the notch.

Abstract: An internal combustion engine comprising a carburetor which has a main air bleed passage and a slow air bleed passage. An air-fuel ratio of the mixture fed into the cylinder of an engine is so controlled that it becomes equal to the stoichiometric air-fuel ratio by a single electromagnetic control valve arranged in the main air bleed passage and the slow air bleed passage. The control valve comprises a first reed valve arranged in the slow air bleed passage, a second reed valve arranged in the main air bleed passage, and an electromagnetic device simultaneously actuating the first reed valve and the second reed valve while maintaining the opening area of the first reed valve at an area which is larger than the opening area of the second reed valve.

Abstract: An air-fuel ratio control device of an internal combustion engine having a carburetor. An air bleed passage is connected to a fuel outflow passage of the carburetor, and an electromagnetic control valve is arranged in the air bleed passage. The control valve is controlled by the detecting signal of an oxygen concentration detector arranged in the exhaust passage so that the air-fuel ratio of a mixture fed into the cylinder of an engine becomes equal to the stoichiometric air-fuel ratio. When the vehicle is decelerated, the mean value of the potential level, which has been applied to the electromagnetic control valve before deceleration, is stored. When the throttle valve is opened during the deceleration and, then, the oxygen concentration detector detects that a rich air-fuel mixture is fed into the cylinder of the engine, the above-mentioned mean value is instantaneously applied to the electromagnetic control valve.

Abstract: A combustion chamber is formed between a cylinder head, which has a central recess and planar surfaces on each side of it, and a juxtaposed piston, which has a central recess and planar surfaces on each side of it. Inlet and outlet ports are formed in the head with the axes of the ports on one side of a phantom plane that includes the axis of the cylinder. The juxtaposed planar regions of the cylinder head and piston define a first squish area between those planar portions on the same side of the phantom plane as the axes of the ports, and a second squish area, which is smaller than the first, between those planar surfaces of the head and piston on the other side of the phantom plane. A spark plug is mounted in the head so that its igniting tip is on the other side of the phantom plane from the axes of the ports but is close to the axis of the cylinder bore and to the planar region in which the squish areas are formed.

Abstract: A throttle valve opening controller for applying varying retarding forces against the closing force of the throttle valve at the time of quick closing thereof depending on the operating condition of the engine, comprising:a first diaphragm device consisting of a first diaphragm which is moved in conjunction with the throttle valve when the throttle valve opening is smaller than the specified value, a spring for urging said first diaphragm with a force smaller than the closing force of the throttle valve, and a first diaphragm chamber which is formed in the rear of said first diaphragm and to which atmospheric pressure is admitted; anda second diaphragm device connected to said first diaphragm device, consisting of a second diaphragm having a stopper for controlling the position of said first diaphragm, a spring for urging said second diaphragm with a force larger than the closing force of the throttle valve, and a second diaphragm chamber formed in the rear of said second diaphragm.

Abstract: An air-fuel ratio control device of an internal combustion engine having a carburetor. An air bleed passage is connected to a fuel outflow passage of the carburetor, and an electromagnetic control valve is arranged in the air bleed passage. The control valve is controlled by the detecting signal of an oxygen concentration detector arranged in the exhaust passage so that the air-fuel ratio of a mixture fed into the cylinder of an engine becomes equal to the stoichiometric air-fuel ratio. After the completion of the warm-up of an engine, the opening area of the control valve is maintained within a fixed range. Before the completion of the warm-up of an engine, the opening degree of the control valve becomes larger than the above-mentioned fixed range.

Abstract: Disclosed is a secondary air feeding device for feeding secondary air into the exhaust passage located upstream of the catalytic converter. A diaphragm type secondary air control valve is provided for usually controlling an amount of secondary air fed into the exhaust passage. Said secondary air control valve stops the feeding operation of secondary air at the time of idling.

Abstract: Herein disclosed in an exhaust gas cleaning system for an internal combustion engine. The cleaning system comprises a change-over valve having its inlet port communicating with an air pump, its first outlet port communicating with the exhaust system of the engine and its second outlet port communicating with the intake system of the engine through a flow control valve. The change-over valve has communication of its outlet ports switched in accordance with the temperature of a catalytic converter which is disposed in the exhaust system.In a modification, a duct providing communication between the second outlet port of the change-over valve and the flow control valve is provided to communicate with the exhaust system.