Patent ID: 7694780

Claim:
A pump arrangement for a gear box comprising: a gear box housing; a shaft rotatably disposed in said gear box housing; a pump including a stationary pump housing and a rotational member, said pump housing having an interior surface circumscribing said shaft and said rotational member and having an inlet port and a discharged path; a fluid delivery arrangement in said shaft which is connected to said discharge path; one of said stationary pump housing or rotational member including a helical extending surface on a radially facing surface such that the rotation of said shaft and rotational member causes fluid to be moved axially along said helical surface to said inlet port of said fluid delivery arrangement in said shaft; and an impeller surface on said rotational member that is separate from and operably engages said helical extending surface, wherein fluid from said inlet port becomes pressurized by said impeller surface and said helical extending surface as said fluid moves radially across said impeller face and axially along said helical extending surface and into said fluid delivery arrangement.