Aisin Seiki Kabushiki Kaisha

Toshio Takeda

Toru Tamura

Noriyoshi Shibata

Yukimori Kobayashi

Shinji Kazaoka

Katsumi Hirabayashi

Matasaburo Kaga

Yoshiharu Okochi

Shinji Kouno

Shigehiro Tamura

Hideaki Yoshidomi

An automatic hydraulic tensioner according to the present invention is provided with a communication mechanism for allowing a space radially inside a plunger-side end wire portion of a coil spring to communicate with a small clearance between the plunger and a cylinder. This automatic hydraulic tensioner thus succeeds, with a simple structure, in preventing bubbles from remaining within a pressure chamber and appropriately maintaining the tension applied to a power transmitting means such as a belt, a chain or the like.

Automatic hydraulic tensioner

A supercharged engine includes an intake passage, an engine located at one end of the intake passage, an air cleaner located at the other end of the intake passage, a mechanical supercharger located in the intake passage, a main throttle valve located at a downstream side of the intake passage, a sub throttle valve located at an upstream side of the intake passage so as to be larger than the main throttle valve in the opening ratio and linked with the main throttle valve. A relief passage, in parallel to the intake passage, is located between a downstream space between the mechanical supercharger and the main throttle valve and an upstream space between the mechanical supercharger and the sub throttle valve, and a relief valve located in the relief passage and responsive to a pressure-difference across the main throttle valve.

Supercharged engine

A fixing mechanism for a timing gear system used in a compressor has a pair of timing gears engaging each other and a pair of shafts mounting the pair of the timing gears. At least one of the pair of timing gears is divided into a gear part and a sleeve part having matching tapered faces. The tapered faces are pressed by a nut onto one another so that the gear part is fixed to the shaft.

Fixing mechanism for a timing gear system

A displacement compressor has a housing defining a chamber and having an inlet and an outlet for the chamber. A pair of meshing helical rotors are rotatably supported about parallel axes in the chamber, so that a compressible fluid may be pumped from the inlet to the outlet. A recess in the wall of the housing is positioned in the chamber and around the outlet and has a substantially trapezoidal shape, in plan. The non-parallel edges of the substantially trapezoidal shape are angled with respect to the axial direction of the rotors, preferably by an angle which is substantially equal to the twist angle of the rotors. Noise producing pressure pulsations at the outlet are thereby reduced.

Displacement compressor with reduced compressor noise

An internal combustion engine has a mechanical super-charger in a conduit connecting the engine with a source of air for compressing the air in the conduit. A bypass passage connected to the conduit on opposite sides of the super-charger compressor is selectively closed by a pressure regulating valve having a valve member movable in response to a pressure differential on opposite sides of a diaphragm member. The diaphragm member is sensitive to a pressure change in the conduit occurring in response to movement of the throttle valve, and causes the valve member to open and reduce the load on the super-charger compressor when the throttle valve is closed.

Internal combustion engine with a mechanical super-charger

A rotor for fluidic apparatus such as, blowers, compressors, fluidic motors and vacuum pumps includes a drive shaft having concaved portions on its periphery and a rotatable member cast around the concaved portions of the drive shaft. The rotor according to the present invention is manufactured through the steps of forming the drive shaft, disposing the formed drive shaft into the cavity of a molding die, and then pouring the molten metal into the cavity while disposing the drive shaft therein. The resulted rotor has no play in the direction of its rotation of its rotatable member.

Rotor for fluidic apparatus

A combined compressor and pump has two parallel shafts journalled in a housing having a compressible fluid inlet and a compressible fluid outlet. Rotors are mounted on each of the shafts for forming a roots type compressor and compressing fluid from the compressible fluid inlet. One shaft of the compressor, which forms a supercharger for an engine, is driven by the engine, and the other shaft is driven in synchronization therewith by a pair of meshing gears mounted on the shafts, the meshing gears being constructed so as to form a gear pump. A coolant circulates within a coolant jacket in the housing and is circulated by the gear pump. The heated coolant may be circulated through a closed loop including a heat exchanger and a bypass passage for bypassing the heat exchanger during low temperature operating conditions.

Combined supercharger and supercharger coolant pump for an internal

A mechanical supercharger utilized in internal combustion engines includes a housing having an inlet port, outlet port and a bypass passage disposed in the housing for connecting the inlet port and the outlet port with each other. A relief valve is disposed in the bypass passage for releasing an air pressure from the outlet port to the inlet port.

Mechanical supercharger

A supercharged pressure controller for internal combustion engines, which comprises a switch valve for switching negative pressure at a throttle valve to atmospheric pressure and a relief valve operated by the signal from the switch valve to release the supercharged pressure in a surge tank, thereby controlling the supercharged pressure accurately in accordance with various running conditions of vehicle, avoiding inconveniences such as rough idling or knocking of engine.

Pressure controller for supercharged internal combustion engines

A Roots type blower wherein a secondary gap distance for rotor is determined in accordance with a cross angle between a normal line at a point of the outer periphery of theoretical base curve of the rotor and a line extending through said point and the rotor center.

Growing community of inventors

Nagoya, Japan

Toshio Takeda