Method of making an axial piston pump barrel with a cast high pressure collection cavity
AssigneeCaterpillar Inc.
InventorThomas D. Gens
Life of this patent
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Abstract
In an axial piston pump, a plurality of reciprocating pistons are at least partially positioned within a barrel. The barrel includes a ring shaped high pressure collection cavity that is positioned between the piston chambers and the outlet of the pump. In order to minimize potential loses due to leakage from the ring shaped collection cavity the barrel is made from a casting that utilizes a ring shaped core supported in a mold. This facilitates the formation of the ring shaped cavity while insuring location and dimensional tolerances, and assisting in the latter machining of the casting to its final form.
Claims17
A method of making an axial piston pump barrel, comprising the steps of:
- positioning a central bore core in a mold;
- positioning a ring shaped core in the mold to encircle the central bore core;
- pouring metal around the ring shaped core and the central bore core to produce a casting in which a central bore defined by the central bore core is fluidly isolated from a cavity defined by the ring shaped core;
- and
- removing the ring shaped core from the casting wherein the step of positioning a ring shaped core in the mold includes supporting said ring shaped core in the mold atop a plurality of pillars, the plurality of pillars corresponding to a number of pistons in the pump.
A method of making an axial piston pump barrel, comprising the steps of:
- positioning a central bore core in a mold;
- positioning a ring shaped core in the mold to encircle the central bore core;
- pouring metal around the ring shaped core and the central bore core to produce a casting in which a central bore defined by the central bore core is fluidly isolated from a cavity defined by the ring shaped core;
- removing the ring shaped core from the casting;
- supporting said ring shaped core in the mold atop a plurality of pillars;
- and
- forming said ring shaped core to include a ring portion and the plurality of pillars extending away from said ring portion parallel to one another.
A method of making an axial piston pump barrel, comprising the steps of:
- positioning a central bore core in a mold;
- positioning a ring shaped core in the mold to encircle the central bore core;
- pouring metal around the ring shaped core and the central bore core to produce a casting in which a central bore defined by the central bore core is fluidly isolated from a cavity defined by the ring shaped core;
- removing the ring shaped core from the casting;
- attaching a plurality of check valves to the casting;
- machining a conical valve seat for each of said plurality of check valves;
- and
- wherein said attaching step includes a step of positioning each of said check valves in contact with one of said conical valves seats.
A method of making an axial piston pump barrel, comprising the steps of:
- positioning a central bore core across a mold;
- supporting a ring shaped core in the mold to encircle the central bore core via a plurality of support separated from the central bore core;
- pouring metal around the ring shaped core and the central bore core to produce a casting in which a central bore defined by the central bore core extends through the casting;
- removing the ring shaped core from the casting;
- and
- attaching at least one check valve into the casting in fluid contact with a ring shaped cavity left by the ring shaped core.
Dependencies are inferred from the claim text.