Aisan Kogyo Kabushiki Kaisha

Seiji Ii

Hiroshi Kawazoe

Toshiro Makimura

Hideki Ito

Kazuya Ando

Fuel pump () may comprise a casing () and a substantially disc-shaped impeller () which is rotatably disposed within the casing (). A first group of concavities () may be formed in a lower face of the impeller (). A second group of concavities () may be formed in an upper face of the impeller (). A first groove () may be formed in the inner face of the casing () opposite the upper face of the impeller (). The first groove () is formed in a region opposite the first group of concavities () and extending from an upstream end to a downstream end. A second groove () may be formed in the inner face of the casing opposite the lower face of the impeller (). The second groove () is formed in a region opposite the second group of concavities () and extending from an upstream end to a downstream end. Preferably, the depth of the first and second groups of concavities and the depth of the first and second grooves are adjusted such that the flow of fuel flowing through the first group of concavities () and the first groove () is greater than the flow of fuel flowing through the second group of concavities () and the second groove ().

Fuel pump

A fuel injection port formed in a seat is opened and closed by a movable valve supported by a flat spring . The movable valve is biased by an elastic force of a coil spring in a direction that closes the fuel injection port . When electric power is supplied to a solenoid coil , the movable valve is moved to a direction that opens the fuel injection port as a result of an electromagnetic attraction force between a magnetic circuit M for generating an electromagnetic attraction force and the movable valve . Air gaps G , G and G are formed within the fuel injection port and permeance ratios between the air gaps may be set to optimal valves.

Electromagnetic fuel injection valve

A fuel injection port formed in a seat is opened and closed by a movable valve supported by a flat spring The movable valve is biased by an elastic force of a coil spring in a direction that closes the fuel injection port When electric power is supplied to a solenoid coil the movable valve is moved to a direction that opens the fuel injection port as a result of an electromagnetic attraction force between a magnetic circuit M for generating an electromagnetic attraction force and the movable valve Air gaps G G and G are formed within the fuel injection port and permeance ratios between the air gaps may be set to optimal values.

Growing community of inventors

Obu, Japan

Seiji Ii