Denso Corporation

Katsuhiko Kusagaya

Motoya Ito

Masatoshi Takagi

Yukio Mori

Eiji Iwanari

Koji Maruyama

Yoshihiko Ito

In a fuel pump having a high pump efficiency, an annular portion is formed on an outer periphery of an impeller to let one- and opposite-side blade grooves be independent of each other. Then, various improvements are made such as tilting front and rear wall surfaces of the blade grooves in a predetermined direction, forming one- and opposite-side blade grooves in a zigzag fashion, forming a guide surface in a communicating passage of a pump housing, and forming communicating holes in an impeller.

Impeller and turbine type fuel pump

Two-inner gears are overlapped with each other through a partition wall and are eccentrically arranged at an inner peripheral side of an outer gear, and eccentric directions of both the inner gears are shifted from each other by 180&deg; to the opposite side. By this, loads in an outer diameter direction due to a rise in fuel pressure affect one outer gear from the two inner gears oppositely to each other by 180&deg;, so that an eccentric load is not generated, and sliding resistance of the outer gear to a cylindrical casing becomes small. Further, the number of teeth of the outer gear is made odd, and the number of teeth of the inner gears is made even.

Trochoid gear type fuel pump

A turbine pump includes a casing having an inlet, an outlet and front and rear arc-shaped pump passages and an impeller. The impeller has plural impeller partitions respectively disposed between every two of the blades thereby forming impeller grooves at front and rear sides of the partitions and an outer ring at the peripheral edge of the blades. Each impeller groove, each of pump passage and the outer ring form a space for circulating fuel. The outside diameter of the impeller is smaller than the pump passages so that the impeller does not contact the pump passages.

Turbine pump

A turbine fuel pump for smoothly flowing fuel in a fuel inlet passage, preventing a pressure loss at a start end of a pump flow passage to prevent generation of a local negative pressure, thereby increasing pump efficiency. The turbine fuel pump includes an impeller with blades and blade grooves, and a pump housing having first and second housings for rotatably storing the impeller. The first housing has a C-shaped side groove, a fuel inlet passage which bends at a start end of the side groove toward the center of the first housing, and an opening on an outer side surface. The second housing has a C-shaped side groove, and a fuel outlet opening communicating with a terminal end of the side groove.

Turbine fuel pump

Two inner gears are overlapped with each other through a partition wall and are eccentrically arranged at an inner peripheral side of an outer gear, and eccentric directions of both the inner gears are shifted from each other by 180&deg; to the opposite side. By this, loads in an outer diameter direction due to a rise in fuel pressure affect one outer gear from the two inner gears oppositely to each other by 180&deg;, so that an eccentric load is not generated, and sliding resistance of the outer gear to a cylindrical casing becomes small. Further, the number of teeth of the outer gear is made odd, and the number of teeth of the inner gears is made even.

Growing community of inventors

Kariya, Japan

Katsuhiko Kusagaya