A magnetic drive pump for use as a vehicle coolant pump. A fluid housing fixed to the engine block as an impeller mounted on the outside of a cylindrical support integrally stamped into a front wall of the housing.Split case pumps A pulley has a central hub that is rotatably mounted within the cylindrical support, coaxial with the impeller bearing. A web of the pulley and the impeller both face the housing front wall in closely spaced, parallel relation, with opposed matching magnetic drive elements. The structure is particularly simple and compact, and needs no cartridge or bearing seal.  An axially compact magnetic drive pump for use as a vehicle coolant pump,Magnetic pumps comprising, a fixed fluid housing having a substantially planar wall of non-magnetic material with a cylindrical support extending from said fluid housing wall into the interior of said fluid housing, said cylindrical support having its axis oriented substantially perpendicular to said housing wall and having a closed outer cylindrical surface inside of said fluid housing and an inner cylindrical surface opening to the exterior of said fluid housing, a pump impeller inside said fluid housing coaxially surrounding and radially and axially supported by the outer cylindrical surface of said cylindrical support, said impeller having a magnetic portion that is thereby located closely facing and parallel to the inside of said fluid housing wall, a cylindrical liner adapted to be press fitted within the inner surface of said cylindrical support, a driving member having a central cylindrical hub sized so as to fit coaxially within said cylindrical liner and annularly spaced therefrom, said driving member also having a substantially planar web with a magnetic portion, and, rolling bearing elements disposed in said annular space to radially and axially support said driving member hub coaxially within said cylindrical liner, whereby said cylindrical liner with said driving member rotatably supported therein may be press fitted within said fluid housing cylindrical support, thereby locating said planar web closely facing and parallel to the outside of said fluid housing wall with its magnetic portion in opposition to said impeller magnetic portion so as to drive said impeller when said driving member rotates, said driving member, housing wall and pump impeller occupying a compact axial space by virtue of their relative location. The preferred embodiment of the coolant pump of the invention includes a fluid housing fixed to the engine block of a vehicle. The housing has a substantially planar front wall of non- magnetic material that encloses a space that is in communication with the cooling passages of the block. The front wall has an integral cylindrical support formed therein with its axis oriented substantially perpendicular to the front wall and extending into the interior of the fluid housing. The outer cylindrical surface of the cylindrical support, which is inside of the fluid housing and faces the coolant, is closed, and need not be sealed. The inner cylindrical surface opens out to the exterior of the fluid housing. A pump impeller inside the fluid housing has a central hub that coaxially surrounds the cylindrical support, and which is radially and axially supported on the outer surface thereof by by a flanged plain bearing. The impeller also has a magnetic portion that is thereby located closely facing and parallel to the inside of the front wall of the fluid housing.

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2012-02-01

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