A dual, dual-pass intercooler assembly for an intercooler supercharger system comprising an intercooler lid mountable to a supercharger housing; a pair of intercooler cores coupled mountable to and within at least one of the intercooler lid and the supercharger housing; wherein the pair of intercooler cores configured to receive and cool supercharger air upon a first pass through the pair of intercooler cores and receive and further cool the supercharger air upon a second pass through the pair of intercooler cores prior to receipt by an engine.

A dual, dual-pass intercooler assembly for an intercooler supercharger system comprising an intercooler lid mountable to a supercharger housing; a pair of intercooler cores coupled mountable to and within at least one of the intercooler lid and the supercharger housing; wherein the pair of intercooler cores configured to receive and cool supercharger air upon a first pass through the pair of intercooler cores and receive and further cool the supercharger air upon a second pass through the pair of intercooler cores prior to receipt by an engine.

A motor assembling method for an electric motor includes inserting a stator of the motor into a first housing of the motor through an opening of the first housing; fitting a shaft portion of a centering jig to an inner peripheral surface of the stator and a mounting portion of a first bearing of the motor in the first housing, and fitting a flange portion to the opening; fixing the stator on which centering is performed using the centering jig to the first housing; removing the centering jig from the first housing; and inserting a rotary shaft of the motor, the first bearing, and a second bearing of the motor into the first housing, and fixing a second housing of the motor to the opening.

A motor assembling method for an electric motor includes inserting a stator of the motor into a first housing of the motor through an opening of the first housing; fitting a shaft portion of a centering jig to an inner peripheral surface of the stator and a mounting portion of a first bearing of the motor in the first housing, and fitting a flange portion to the opening; fixing the stator on which centering is performed using the centering jig to the first housing; removing the centering jig from the first housing; and inserting a rotary shaft of the motor, the first bearing, and a second bearing of the motor into the first housing, and fixing a second housing of the motor to the opening.

Apparatus and method for directing airflow into the air intake (carburetor or fuel injection system) of an internal combustion engine for increasing air flow velocity and the quantity of air reaching the cylinder or cylinders thereof through the use of an electrically powered fan, are described. The fan is installed inside of the air filter element such that when the air intake throttle plates are closed or partially closed, the unused airflow exits the apparatus to relieve the pressure created by the fan, and when additional air is needed by the engine, air can enter the filter element. The fan may be continuously operated during the operation of the motor, and at all engine speeds.

Apparatus and method for directing airflow into the air intake (carburetor or fuel injection system) of an internal combustion engine for increasing air flow velocity and the quantity of air reaching the cylinder or cylinders thereof through the use of an electrically powered fan, are described. The fan is installed inside of the air filter element such that when the air intake throttle plates are closed or partially closed, the unused airflow exits the apparatus to relieve the pressure created by the fan, and when additional air is needed by the engine, air can enter the filter element. The fan may be continuously operated during the operation of the motor, and at all engine speeds.

An object is to provide a seal structure capable of reducing abrasion of a seal ring without increasing the number of components and of minimizing generation of abrasion powder. A seal structure to seal clearance between an outer peripheral surface 8a of a rotary shaft 8 and an inner peripheral surface 6a of a bearing housing 6 includes: a first seal groove 22A formed on the outer peripheral surface 8a of the rotary shaft 8; a second seal groove 22B disposed between the first seal groove and the impeller; a first seal ring 26 to be mounted to the first seal groove; and a second seal ring 28 to be mounted to the second seal groove. The first seal ring 26 includes a first-seal body portion 26A mounted to the first seal groove, and a first-seal protruding portion 26B protruding from the first-seal body portion toward the second seal ring 28, and being configured to be in contact with the second seal ring contacting a bearing-side wall surface 22Ba of the second seal groove, in a state in which the first-seal body portion is in contact with a bearing-side wall surface 22Aa of the first seal groove.

An air boost system for a two-cycle engine, such as an EMD engine, which operates with one or more roots blowers, or for similar engines that use gear-driven roots blowers or centrifugal blowers. At least one of the roots blowers is equipped with a variable transmission, which allows airflow into the engine to be varied in accordance with load or other engine operating conditions.

An air boost system for a two-cycle engine, such as an EMD engine, which operates with one or more roots blowers, or for similar engines that use gear-driven roots blowers or centrifugal blowers. At least one of the roots blowers is equipped with a variable transmission, which allows airflow into the engine to be varied in accordance with load or other engine operating conditions.

An exhaust gas recirculation (EGR) system that utilizes an insulated separation wall that separates the hot, humid EGR gas duct from the cool, dry inlet air duct in the upstream proximity of the compressor inlet of the associated turbocharger compressor. This insulated separation wall inhibits the condensation of water droplets and the formation of ice particles near the mixing point of the EGR gases and inlet air in the upstream proximity of the compressor inlet, such that the turbocharger compressor wheel, blades, and other components are not subsequently damaged by the condensed water droplets or formed ice particles. The added insulation in this cold sink area essentially thermally isolates the hot, humid EGR gas flow from the cool, dry inlet air flow until the actual mixing point of the flows.