Abstract: A screw pump includes a male screw, a female screw, a motor, a journal, a bearing member, and a case. The motor includes an output shaft, which transmits a torque to the male screw, and the motor is operable to drive the male screw to rotate the same through the output shaft. The journal is rotatably placed between the output shaft of the motor and the male screw. The bearing member rotatably supports the journal. The case includes a screw receiving hole that receives the male screw and the female screw. The journal and the male screw are coaxially and non-detachably integrated together. The output shaft and the journal are fitted together by clearance fit that enables transmission of the torque between the output shaft and the journal.

Abstract: A screw pump pumps a fluid from an inlet port to a discharge port by rotating one drive screw and at least one driven screw which mesh with each other and includes the drive screw being rotatable about a drive rotation shaft, the driven screw to be driven by the drive screw and being rotatable about a driven rotation shaft, a drive journal provided coaxially with the drive screw and to rotate integrally with the drive screw, a driven journal provided coaxially with the driven screw and to rotate integrally with the driven screw while making contact with the drive journal along a contact line between the drive rotation shaft and the driven rotation shaft, a case including a cylinder that receives the drive screw and the driven screw, and a bearing member to rotatably support the drive journal and the driven journal.

Abstract: A reforming device includes a reforming part that subjects a hydrocarbon-based raw material to be reformed to a reforming reaction to form a reducing agent to be supplied to a reducing catalyst for reducing nitrogen oxide selectively. The reforming part has a reforming reaction region through which the raw material to be reformed passes and is reacted with supplied hydrogen atoms supplied so as to be reformed to the reducing agent. For example, a hydrogen permeable membrane having a first surface and a second surface may be provided in the reforming part to permeate hydrogen atoms from the first surface to the second surface and to produce the hydrogen atoms on the second surface. The reforming device can be suitably used for an exhaust gas control system for cleaning exhaust gas, for example.

Abstract: A nitrogen oxides purification device has an exhaust gas heating section and a nitrogen oxides purification section. The exhaust gas heating section has a fuel injection device and a catalytic metal. The nitrogen oxides purification device is provided in a heat exchanger having a downstream exhaust gas flow passage located downstream of the nitrogen oxides purification section and an upstream exhaust gas flow passage located upstream of the exhaust gas heating section. Exhaust gas heated at the exhaust gas heating section flows through the downstream exhaust gas flow passage. The exhaust gas to be heated at the exhaust gas heating section flows through the upstream exhaust gas flow passage. Heat is transferred between the downstream and upstream exhaust gas flow passages. The nitrogen oxides purification device operates at low fuel consumption.

Abstract: A reforming device includes a reforming part that subjects a hydrocarbon-based raw material to be reformed to a reforming reaction to form a reducing agent to be supplied to a reducing catalyst for reducing nitrogen oxide selectively. The reforming part has a reforming reaction region through which the raw material to be reformed passes and is reacted with supplied hydrogen atoms supplied so as to be reformed to the reducing agent. For example, a hydrogen permeable membrane having a first surface and a second surface may be provided in the reforming part to permeate hydrogen atoms from the first surface to the second surface and to produce the hydrogen atoms on the second surface. The reforming device can be suitably used for an exhaust gas control system for cleaning exhaust gas, for example.

Abstract: A nitrogen oxides purification device has an exhaust gas heating section and a nitrogen oxides purification section. The exhaust gas heating section has a fuel injection device and a catalytic metal. The nitrogen oxides purification device is provided in a heat exchanger having a downstream exhaust gas flow passage located downstream of the nitrogen oxides purification section and an upstream exhaust gas flow passage located upstream of the exhaust gas heating section. Exhaust gas heated at the exhaust gas heating section flows through the downstream exhaust gas flow passage. The exhaust gas to be heated at the exhaust gas heating section flows through the upstream exhaust gas flow passage. Heat is transferred between the downstream and upstream exhaust gas flow passages. The nitrogen oxides purification device operates at low fuel consumption.

Abstract: The invention aims to provide an emulsion composite which is excellent in safety and stability and which can easily be produced. 20 g of soybean oil and 2.4 g of glycerin were mixed by being stirred with a magnetic stirrer. The mixture was added to strong alkali ionic water to adjust the total amount to 200 g. The solution was subjected to primary emulsification in a boiling water bath at 12,765 rpm for a stirring time of 30 minutes using an autohomomixer. Necessary amounts of strong alkali ionic water and glycerin were then added such that the volume and the osmotic pressure became predetermined values. This sample was subjected to secondary emulsification at a pressure of 1,000 bar with 40 pass times using a high-pressure homogenizer to prepare an O/W emulsion (emulsion composite).

Abstract: A fuel transfer pipe and a cylinder head of an engine in which a fuel injection device is restricted from being separated from each other by a restricting member. A pressing member is interposed between the fuel transfer pipe and the cylinder head to receive a restricting force of the restricting member presses the fuel transfer pipe to a side opposing the cylinder head and presses the fuel injection device to a side of the cylinder head by a reaction force against the restricting force.

Abstract: A fuel transfer pipe and a cylinder head of an engine in which a fuel injection device is restricted from being separated from each other by a restricting member. A pressing member is interposed between the fuel transfer pipe and the cylinder head to receive a restricting force of the restricting member presses the fuel transfer pipe to a side opposing the cylinder head and presses the fuel injection device to a side of the cylinder head by a reaction force against the restricting force.

Abstract: In an electromagnetic fuel injector, when an opening valve pulse is turned ON by a command from an ECU, a first coil is energized and a first fixed core attracts a moving core and unseats a valve member from a valve seat to open a valve of the fuel injector. A time Tx before the opening valve pulse becomes OFF, a closing valve pulse is turned ON, whereby a second coil is energized and a second fixed core attracts the moving core toward a valve closing direction. As a result, after the valve starts to close, the urging force in the valve closing direction increases rapidly, the time delay from the start of valve closing to the end is shortened, and the valve closing responsiveness improves.

Abstract: In an electromagnetic fuel injector, when an opening valve pulse is turned ON by a command from an ECU, a first coil is energized and a first fixed core attracts a moving core and unseats a valve member from a valve seat to open a valve of the fuel injector. A time Tx before the opening valve pulse becomes OFF, a closing valve pulse is turned ON, whereby a second coil is energized and a second fixed core attracts the moving core toward a valve closing direction. As a result, after the valve starts to close, the urging force in the valve closing direction increases rapidly, the time delay from the start of valve closing to the end is shortened, and the valve closing responsiveness improves.

Abstract: In a high pressure fuel injection system, fuel is pumped up from a fuel tank by a low pressure pump and further pressurized by a high pressure pump. Pressurized fuel is accumulated in a common rail connected to injectors which inject fuel into an engine. A high pressure regulator is connected to the common rail to mechanically relieve excessive fuel pressure in the common rail or to electronically reduce the fuel pressure when required. An electronic control unit controls operation of the high pressure pump, the high pressure regulator and the injectors according to engine operating conditions which are fed to the unit from various sensors. The fuel pressure in the common rail is decreased by operation of the high pressure pump and the high pressure regulator either rapidly or gradually according to engine operating conditions.

Abstract: A fuel supply apparatus having a cross sectional area S.sub.0 of a first low pressure fuel passage which is connected to a high pressure pump and which has a pressure regulator, a cross sectional area S.sub.1 of an orifice formed between the first low pressure fuel passage and a second low pressure fuel passage, and a cross sectional area S.sub.2 of the second low pressure fuel passage for supplying the low pressure fuel to the first low pressure fuel passage. Those cross sectional areas are set to satisfy a relationship of S.sub.1 <S.sub.0 <S.sub.2 such that the pressure pulsation generated at the pressure regulator is reduced, and the noise produced by the fuel supply apparatus is reduced.

Abstract: According to the present invention, a fuel injection apparatus includes a casing having a control pressure chamber for storing fuel supplied from fuel passage, a needle valve to which fuel stored in the control pressure chamber applies pressure in the valve closing direction, a valve device for interrupting communication between the fuel passage and the control pressure chamber to seal fuel in said control pressure chamber, and volume changing device for expanding volume of the control pressure chamber after fuel is sealed in the control pressure chamber by the valve device. According to the above fuel injection device, pressure in the control pressure chamber is reduced while the fuel is stored therein by the volume changing device, the nozzle needle is lifted, and injection is started. For this reason, it is not necessary to supply surplus fuel in addition to the injection fuel during the fuel injection.

Abstract: To provide a fuel injection pump which can sufficiently and stably supply fuel to a fuel pressurization chamber during a fuel intake stroke, a plunger chamber, a spill port and a spill passage are mutually communicable, while a reflux passage, an intake gallery, an intake passage, an intake port and the plunger chamber are mutually communicable. A reflux passage communicates with a damping chamber through a communication passage. The spill passage and the reflux passage communicate with each other, and when a spill valve opens, high-pressure fuel within the plunger chamber spills from the spill valve and into the intake gallery through the reflux passage, causing pulsation having a pressure level difference to the spill fuel. When the pulsation wave passes through the damping chamber, as the level difference in the pulsation wave is reduced, a sufficient quantity of fuel can stably be supplied from the intake gallery to the plunger chamber.

Abstract: A high pressure fuel supply pump comprises a cylinder, the upper part of which is exposed to the outside of a head cover that is a part of the engine housing, and is fixed to the head cover by means of bolts, not shown. The remaining portion of the high pressure fuel supply pump is received in an accommodation hole of the head cover. A pump cam 111 is mounted to a valve camshaft for driving a suction/exhaust valve and drives the high pressure fuel supply pump. The use of an exclusive shaft for pump driving only, a bearing member therefor, and the like is rendered unnecessary, which enables a reduction in the number of parts employed. Further, since the timing with which the pressurized fuel is discharged is controlled through the operation of a solenoid valve, the precision with which fuel injection is controlled is improved.

Abstract: A fuel injection valve of a diesel engine, comprising a valve body including a concave conical surface in the tip portion of the valve body, and fuel injection holes extending from the concave surface to the outside of the valve body, and a needle valve movable in the valve body and including a cylindrical shaft portion, a first conical surface adjacent to the shaft portion and having a conical angle smaller than that of the concave surface, the lower edge of the first conical surface defining a contact line separably contacting with the concave surface, a second conical surface adjacent to the first surface and having a conical angle substantially equal to that of the concave surface, a third conical surface adjacent to the second surface and having a conical angle greater than that of the concave surface.