# US 12,006,924 B2 · Axial piston pump mounting flange configuration > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,006,924 B2 - Document ID: US12006924B2 - Status: Granted - Kind: B2 - Application number: 17/393,685 - Filed: 2021-08-04 - Published: 2023-02-09 - Granted: 2024-06-11 - Earliest claimed: 2021-08-04 - Assignees: Caterpillar Inc. - Applicants: Caterpillar Inc. - Inventors: Matthew G. Mickiewicz; Stive Ramalho; Darren Joseph Hopf; Justin Douglas Speichinger; Paul Alan Rousseau; Brice Mallein - Web page: https://patentgrep.com/patent/US12006924B2 ## CPC - F04B 1/2064: Housings - F04B 53/16: Casings; Cylinders; Cylinder liners or heads; Fluid connections - F04B 53/22: Arrangements for enabling ready assembly or disassembly - F04C 11/005: {of dissimilar working principle} - F04C 2270/03: Torque - F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F) - F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS ## Abstract A hydraulic pump or motor includes a mounting flange that is disposed at the first end of the housing. The mounting flange defines a pair of fastener receiving apertures that are disposed along the X-axis on either side of the shaft. The pair of fastener receiving apertures each define a radius center that are spaced away from each other a X dimension, and a pilot projection extends longitudinally away from the mounting flange, defining a pilot projection diameter. A ratio of the X dimension to the pilot projection diameter ranges from 1.07 to 1.11. ## Claims ### Claim 1 A hydraulic pump or motor comprising: a shaft defining a longitudinal axis, a Y-axis extending upwardly and orthogonally from the longitudinal axis, and an X-axis extending orthogonally to the longitudinal axis, and the Y-axis; a housing defining a first longitudinal end, a second longitudinal end, and a cavity that extends from adjacent the first longitudinal end toward the second longitudinal end; a plurality of mechanical components including one hydraulic interacting component that are disposed in the cavity; and an inlet and an outlet that are in fluid communication with the cavity, the inlet and the outlet being disposed at the second longitudinal end; wherein a mounting flange is disposed at the first longitudinal end of the housing, the shaft extends from the cavity past the first longitudinal end of the housing and through the mounting flange, the mounting flange comprising a rectangular shape with corners and defining four fastener receiving apertures arranged generally in respective corners of the rectangular shape, the four fastener receiving apertures having radius centers that are arranged in a rectangular pattern having two sides defined by an X dimension and two sides defined by a Y dimension equal to the X dimension, and a pilot projection that extends longitudinally away from the mounting flange or a pilot recess extending longitudinally into the mounting flange, defining a pilot projection diameter or a pilot recess diameter, and a ratio of the X dimension to the pilot projection diameter ranges from 1.07 to 1.11, or a ratio of the X dimension to the pilot recess diameter ranges from 1.07 to 1.11. ### Claim 2 (depends on 1) The hydraulic pump or motor of claim 1, wherein each of the fastener receiving apertures defines a slot width, and a ratio of the X dimension to the slot width ranges from 7.00 to 10.2. ### Claim 3 (depends on 2) The hydraulic pump or motor of claim 2, wherein the X dimension ranges from 148.0 mm to 152.0 mm, the slot width ranges from 15.0 mm to 21.0 mm, wherein the pilot projection or the pilot recess is the pilot projection, and the pilot projection diameter ranges from 138.0 mm to 142.0 mm. ### Claim 4 (depends on 3) The hydraulic pump or motor of claim 3, wherein the shaft receives or delivers more than 1700 n/m of torque. ### Claim 5 (depends on 1) The hydraulic pump or motor of claim 1, wherein the pilot projection or the pilot recess is the pilot projection, and the plurality of mechanical components including the hydraulic interacting component that are disposed in the cavity includes at least one of the following: a vane, an impeller, a piston, a gear and a swash plate. ### Claim 6 A hydraulic pump or motor comprising: a shaft defining a longitudinal axis, a Y-axis extending upwardly and orthogonally from the longitudinal axis, and an X-axis extending orthogonally to the longitudinal axis, and the Y-axis; a housing defining a first longitudinal end, a second longitudinal end, and a cavity that extends from adjacent the first longitudinal end toward the second longitudinal end; a plurality of mechanical components including one hydraulic interacting component that are disposed in the cavity; and an inlet and an outlet that are disposed near the second longitudinal end and that are in communication with the cavity; wherein a mounting flange is disposed at the first longitudinal end of the housing, the shaft extends from the cavity past the first longitudinal end of the housing and through the mounting flange, the mounting flange having a square shape with corners and defining a plurality of bolt receiving slots arranged generally in respective corners of the square shape, the plurality of bolt receiving slots having radius centers arranged in a square pattern having four sides each defined by an X dimension and at least one of the bolt receiving slots defines a slot width, and a ratio of the X-dimension to the slot width ranges from 7.00 to 10.2. ### Claim 7 (depends on 6) The hydraulic pump or motor of claim 6, the mounting flange further defines a pilot projection defining a pilot projection diameter, and a ratio of the pilot projection diameter to the slot width ranges from 7.00 to 10.2. ### Claim 8 (depends on 7) The hydraulic pump or motor of claim 7, wherein the X dimension ranges from 148.0 mm to 152.0 mm, the slot width ranges from 15.0 mm to 21.0 mm, and the pilot projection diameter ranges from 138.0 mm to 142.0 mm. ### Claim 9 (depends on 8) The hydraulic pump or motor of claim 8, wherein the shaft receives or delivers more than 1700 n/m of torque. ### Claim 10 (depends on 6) The hydraulic pump or motor of claim 6, wherein the plurality of mechanical components including the hydraulic interacting component that are disposed in the cavity at least one of the following: a vane, a gear, an impeller, a piston, and a swash plate. ### Claim 11 A hydraulic pump assembly comprising: a shaft defining a longitudinal axis, a Y-axis extending upwardly and orthogonally from the longitudinal axis, and an X-axis extending orthogonally to the longitudinal axis, and the Y-axis; a housing defining a first longitudinal end, a second longitudinal end, and a cavity that extends from adjacent the first longitudinal end toward the second longitudinal end; a plurality of mechanical components including at least one hydraulic interacting component that are disposed in the cavity; and an inlet and an outlet that are disposed near the second longitudinal end, and which are in communication with the cavity; wherein a mounting flange is disposed at the first longitudinal end of the housing, the shaft extends from the cavity past the first longitudinal end of the housing and through the mounting flange, the mounting flange comprising a rectangular shape and defining a plurality of fastener receiving apertures having radius centers arranged in a rectangular pattern within a boundary of the rectangular shape and with sides parallel to one of the X or Y axis wherein a spacing of the fastener receiving apertures along the X-axis is equal to an X dimension, and a pilot projection that extends longitudinally away from the mounting flange or a pilot recess extending longitudinally into the mounting flange, defining a pilot projection diameter or a pilot recess diameter, and a ratio of the X dimension to the pilot projection diameter ranges from 1.07 to 1.11, or a ratio of the X dimension to the pilot recess diameter ranges from 1.07 to 1.11. ### Claim 12 (depends on 11) The hydraulic pump assembly of claim 11, wherein each of the fastener receiving apertures defines a slot width, and a ratio of the X dimension to the slot width ranges from 7.0 to 10.2. ### Claim 13 (depends on 12) The hydraulic pump assembly of claim 12, wherein the X dimension ranges from 148.0 mm to 152.0 mm, the slot width ranges from 15.0 mm to 21.0 mm, and the pilot projection diameter ranges from 138.0 mm to 142.0 mm. ### Claim 14 (depends on 13) The hydraulic pump assembly of claim 13, wherein the shaft transmits more than 1700 n/m of torque. ### Claim 15 (depends on 11) The hydraulic pump assembly of claim 11, wherein the plurality of mechanical components including the at least one hydraulically interacting component that are disposed in the cavity includes at least one of the following: a vane, a gear, an impeller, a piston, and a swashplate. ### Claim 16 (depends on 15) The hydraulic pump assembly of claim 15, wherein the plurality of mechanical components includes both a piston, and a swashplate. ### Claim 17 (depends on 11) The hydraulic pump assembly of claim 11, wherein, the shaft defines an exposed free end that includes teeth. ### Claim 18 (depends on 11) The hydraulic pump assembly of claim 11, further comprising at least one M14 bolt, or at least one M16 bolt, or at least one M20 bolt that each pass longitudinally through each of the fastener receiving apertures. ### Claim 19 (depends on 16) The hydraulic pump assembly of claim 16, further comprising a valve plate that is in communication with the inlet and the outlet. ### Claim 20 (depends on 16) The hydraulic pump assembly of claim 16, further comprising a shoe that that slidably and rotatably couples the piston to the swashplate.