Gear pump and method of making same
AssigneeSoqi Kabushiki Kaisha
InventorKatsuji Meguro
Life of this patent
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Abstract
An improved high pressure intermeshing gear pump that achieves high efficiency and a low cost by forming the pumping cavity such that no fillets exist at the corners permitting closed fits without utilizing bearing end plates. In addition an improved coupling between the gears and their supporting shafts is disclosed as is a simplified machining method that eliminates burrs that may be formed during the drilling operations.
Claims29
An intermeshing gear pump comprised of an outer housing defining a pumping cavity in which a pair of intermeshing gears are journalled for pumping a fluid from a fluid inlet to said pumping cavity to a pumping outlet from said pumping cavity, said intermeshing gears having end faces at opposite sides of said gears extending perpendicularly to the rotational axes of said gears, said outer housing comprising a main body part and a pair of separate end plates affixed thereto, said main body part having an opening extending axially therethrough defining a portion of said pumping cavity facing the circumferential peripheral surfaces of said gears, said end plates each closing a respective side of said main body part opening and being in confronting relation to respective of said gear end faces for closing said pumping chamber, and a fastener arrangement for affixing said end plates and said main body part together.
An intermeshing gear pump comprised of an outer housing defining a pumping cavity in which a pair of intermeshing gears are journalled for pumping a fluid from a fluid inlet to said pumping cavity to a pumping outlet from said pumping cavity, said intermeshing gears having end faces extending perpendicularly to the rotational axes of said gears at at least one side of said gears, said outer housing comprising a main body part defining at least in part said pumping cavity and an end plate affixed thereto and closing said pumping cavity, at least one of said gears forming a bore extending therethrough to receive a shaft, said end face of said one gear forming a slot extending perpendicularly to said bore, a coupling pin extending through said shaft and having at least one end portion received in said slot for non-rotatably coupling said shaft and said one gear.
An intermeshing gear pump comprised of an outer housing defining a pumping cavity in which a pair of intermeshing gears are journalled for pumping a fluid from a fluid inlet to said pumping cavity to a pumping outlet from said pumping cavity, said intermeshing gears having end faces extending perpendicularly to the rotational axes of said gears at opposite sides of said gears, said outer housing comprising a main body part and a pair of separate end plates affixed thereto, said main body part having an opening extending axially there through defining a portion of said pumping cavity facing the circumferential peripheral surfaces of said gears, said end plates each closing a respective side of said main body part opening and being in direct engaging relationship to respective of said gear end faces for closing said pumping chamber, and a fastener arrangement for affixing said end plates and said main body part together.
A method of forming an intermeshing gear pump comprised of an outer housing defining a pumping cavity in which a pair of intermeshing gears are journalled on respective shafts for pumping a fluid from a fluid inlet to the pumping cavity to a pumping outlet from the pumping cavity, the intermeshing gears having end faces extending perpendicularly to the rotational axes of the gears at opposite sides of the gears, the outer housing comprising a main body part and at least one separate end plate affixed thereto, the main body part having an opening extending axially therein defining a portion of the pumping cavity facing the circumferential peripheral surfaces of the gears, the end plate closing a respective side of the main body part opening and a fastener arrangement for affixing the end plate and the main body part together, said method comprising the steps of placing a pair of plates in abutting relationship, affixing said plates against transverse movement relative to each other, drilling a pair of holes through the plates from one side of one of the plates and ending through the oppositely facing side of the other of the plates so that any burrs formed by the drilling operation will be formed on the oppositely facing side of the other of the plates, machining a cavity in at least the oppositely facing side of the other of the plates of sufficient size to form the pumping cavity and in an area encompassing that of the previously drilled holes to remove any burrs formed by the drilling operation and form the main body part, and placing and affixing the one plate against the main body part in closing relation to the pumping cavity formed therein to form the end plate therefor.
Dependencies are inferred from the claim text.