Abstract: Oil jets are mounted in upper two cylinders in a cylinder block of a 4-cylinder vertical engine to inject an oil to rear faces of pistons received in the two cylinders. Thus, although lower pistons are cooled more effectively by the oil dropped by gravitation through oil return bores provided in journal support walls, the upper pistons are forcibly cooled by the oil injected from the oil jets, so that the four pistons can be cooled equally to prevent insufficient cooling and excessive cooling, while minimizing the required amount of the oil.

Abstract: In a water-cooled outboard marine engine, a heat transfer portion is provided in an exit passage located between an outlet end of a cylinder water jacket and a cooling water outlet passage at a position upstream of the thermostat valve. Thus, when the thermostat valve has opened and the cooling water expelled from the water jacket via the thermostat valve has been replaced by freshly introduced cooling water, the heat transfer portion having a certain heat capacity warms the freshly introduced cooling water so that the rapid change in the cooling water temperature at the thermostat valve and the resulting hunting of the thermostat valve can be avoided.

Abstract: An object of the present invention is to provide a transceiver, capable of receiving radio signals in a radio communication apparatus, and capable of receiving one to two channels for regional information such as weather from a large number of channels. The transceiver comprises a radio communication section and a weather broadcast receiving section. A channel of radio communication and a weather reception are selected by a channel switch, and a selecting section selects radio channel signal reception or weather channel signal reception by use of a control signal sent from a CPU of a control section. If the weather reception is selected and weather channel frequency data is stored in a memory, the weather channel reception can be carried out. If no weather channel frequencies are stored therein, a weather frequency band is scanned to detect weather channel frequencies, and detected frequencies are temporarily stored in the memory and can be used until the power supply is turned off.

Abstract: In an engine intake A/F ratio control system in an outboard engine system, a secondary air passage (P) for supplying secondary air for regulating the A/F ratio of an air-fuel mixture is connected to a carburetor (33) in an intake system of an engine (E), and a duty control valve (68) is connected to the secondary air passage (P). A duty control unit (92) is connected to the duty control valve (68) for controlling the duty ratio of a pulse applied to a coil (76) of the duty control valve (68), and an LAF sensor (94) is mounted to an exhaust system for detecting an A/F ratio of an exhaust gas to input a detection signal proportional to the A/F ratio of the exhaust gas to the duty control unit (92).

Abstract: In an engine intake A/F ratio control system in an outboard engine system, a secondary air passage (P) for supplying secondary air for regulating the A/F ratio of an air-fuel mixture is connected to a carburetor (33) in an intake system of an engine (E), and a duty control valve (68) is connected to the secondary air passage (P). A duty control unit (92) is connected to the duty control valve (68) for controlling the duty ratio of a pulse applied to a coil (76) of the duty control valve (68), and an LAF sensor (94) is mounted to an exhaust system for detecting an A/F ratio of an exhaust gas to input a detection signal proportional to the A/F ratio of the exhaust gas to the duty control unit (92).

Abstract: In a gas-liquid separation device for an internal combustion engine used in an outboard motor, comprising: a gas-liquid separation chamber defined in a part of the engine, the chamber being provided with first and second ports communicating with a crankcase, and a third port communicating with an intake passage, the first port is provided with a first one-way valve for allowing blow-by gas from the crankcase to flow into the chamber, and the second port is provided with a second one-way valve for allowing oil separated from the blow-by gas to be discharged from the chamber, wherein the second one-way valve includes a reed valve member adapted to selectively close the second port, and a valve seat defined by an annular surface which is elevated from a surface of a wall surrounding the second port and defines a larger opening area than the second port.

Abstract: In a water-cooled outboard marine engine, a heat transfer portion is provided in an exit passage located between an outlet end of a cylinder water jacket and a cooling water outlet passage at a position upstream of the thermostat valve. Thus, when the thermostat valve has opened and the cooling water expelled from the water jacket via the thermostat valve has been replaced by freshly introduced cooling water, the heat transfer portion having a certain heat capacity warms the freshly introduced cooling water so that the rapid change in the cooling water temperature at the thermostat valve and the resulting hunting of the thermostat valve can be avoided.

Abstract: In a gas-liquid separation device for an internal combustion engine used in an outboard motor, comprising: a gas-liquid separation chamber defined in a part of the engine, the chamber being provided with first and second ports communicating with a crankcase, and a third port communicating with an intake passage, the first port is provided with a first one-way valve for allowing blow-by gas from the crankcase to flow into the chamber, and the second port is provided with a second one-way valve for allowing oil separated from the blow-by gas to be discharged from the chamber, wherein the second one-way valve includes a reed valve member adapted to selectively close the second port, and a valve seat defined by an annular surface which is elevated from a surface of a wall surrounding the second port and defines a larger opening area than the second port.

Abstract: A drive transmission system for a vessel propelling equipment 1 provided with a clutch operating device that can easily be installed comprises a shift slider 40 axially slidable within a propeller shaft 9 to move a clutch gear 30 through a clutch shifter pin 38 inserted through the propeller shaft; and an operating member capable of operating the shifts slider from above a gear case 5; the operating member includes: a shift fork 50 engaged with 9 fork engaging portion 35c of the shift slider, to move the shift slider; a guide member 59 supporting the shift fork movable in a specific direction; a rotary rod member 55 engaged with a rod engaging section 50b of the shift fork to move the shift fork; and a support member 51 drivably supporting the rod member and fixedly supporting the guide member, thereby sub-assembling the rod member and the guide member to transmit the operation of the rod member to the shift fork; the shift fork is so assembled to be engaged with the fork engaging section of the shift slider

Abstract: A die for continuously extruding hollow articles from thermosetting resins comprises an outer cylinder and an inner cylinder arranged coaxially with an annular gap left between them for the passage of resin, both cylinders being adjusted so as to be cooled at their upstream portions and heated at their downstream portions relative to the flow of extrusion.