# US 11,306,715 B2 · Screw-spindle pump, fuel delivery assembly, and fuel delivery unit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,306,715 B2 - Document ID: US11306715B2 - Status: Granted - Kind: B2 - Application number: 16/624,745 - Filed: 2018-06-25 - Published: 2021-06-03 - Granted: 2022-04-19 - Earliest claimed: 2017-06-27 - Assignees: Vitesco Technologies GmbH - Applicants: Vitesco Technologies GmbH - Inventors: Johannes Deichmann; Tim Gonnermann; Marc Völker - Web page: https://patentgrep.com/patent/US11306715B2 ## CPC - F04C 2/16: with helical teeth, e.g. chevron-shaped, screw type {(for non-parallel axes of movement F04C3/00)} - F04C 15/0049: {Equalization of pressure pulses (silencing for compressors F04C29/06)} - F04C 2210/1044: Fuel - F04C 2230/60: Assembly methods - F04C 2240/30: Casings or housings - F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS ## Abstract A screw-spindle pump includes: a first (drive) screw spindle and a second (running) screw spindle that runs oppositely with respect to the first screw spindle; and a pump housing configured to receive the first and second screw spindles. The first and second screw spindles form, together with at least the pump housing, delivery chambers, which move from a suction side of the pump to a pressure side of the pump due to a rotation of the first and second screw spindles. The pump housing has a first abutment insert for the first screw spindle and a second abutment insert for the second screw spindle, and at least one of the first and second abutment inserts is set angled with respect to a first plane of the pump, to counteract operationally induced crossing of the first and second screw spindles. ## Claims ### Claim 1 A screw-spindle pump (P) comprising: a first screw spindle (2) and a second screw spindle (4), wherein the first screw spindle (2) is a drive spindle and the second screw spindle (4) is a running spindle that runs oppositely with respect to the first screw spindle (2); and a pump housing (6) configured to receive the first and second screw spindles (2, 4), wherein the first and second screw spindles (2, 4) form, together with at least the pump housing (6), delivery chambers (10), which move from a suction side (12) of the pump (P) to a pressure side (14) of the pump (P) as a consequence of a rotation of the first and second screw spindles (2, 4), wherein the pump housing (6) has a first abutment insert (16) configured as an abutment surface against which the first screw spindle (2) abuts and is thus supported and a second abutment insert (18) configured as an abutment surface against which the second screw spindle (4) abuts and is thus supported, and wherein at least one of the first and second abutment inserts (16, 18) is arranged so as to be angled (α1, α2) with respect to a first plane (X-Z) of the pump (P), so as to counteract operationally induced crossing of the first and second screw spindles (2, 4). ### Claim 2 (depends on 1) The pump as claimed in claim 1, wherein the first abutment insert (16) is arranged at a first angle (α1), and the second abutment insert (18) is arranged at a second angle (α2), with respect to the first plane (X-Z) of the pump (P), so as to counteract the operationally induced crossing. ### Claim 3 (depends on 2) The pump as claimed in claim 2, wherein the first angle (α1) is arranged oppositely in relation to the second angle (α2). ### Claim 4 (depends on 3) The pump as claimed in claim 3, wherein the first and second angles (α1, α2) are identical in terms of magnitude. ### Claim 5 (depends on 4) The pump according to claim 4, wherein at least one of the first and second abutment inserts (16, 18) is arranged so as to be angled (β1, β2) with respect to a second plane (X-Y) of the pump (P), which is orthogonal to the first plane (X-Z) of the pump (P), so as to counteract the operationally induced crossing. ### Claim 6 (depends on 5) The pump as claimed in claim 5, wherein the first abutment insert (16) is arranged at a third angle (β1), and the second abutment insert (18) is arranged at a fourth angle (β2), with respect to the second plane (X-Y), so as to counteract the operationally induced crossing. ### Claim 7 (depends on 6) The pump as claimed in claim 6, wherein the third angle (β1) is arranged oppositely in relation to the fourth angle (β2). ### Claim 8 (depends on 7) The pump as claimed in claim 7, wherein the third and fourth angles (β1, β2) are identical in terms of magnitude. ### Claim 9 (depends on 1) The pump as claimed in claim 1, wherein at least one of the first and second abutment inserts (16, 18) is of cuboidal, prismatic or round form. ### Claim 10 (depends on 9) The pump as claimed in claim 9, wherein at least one of the first and second abutment inserts (16, 18) has a peripheral shoulder (23) for axial fixing with respect to the pump housing (6). ### Claim 11 (depends on 10) The pump as claimed in claim 10, wherein at least one of the first and second abutment inserts (16, 18) has shaped elements (25) for tangential fixing with respect to the pump housing (6). ### Claim 12 (depends on 11) The pump as claimed in claim 11, wherein at least one of the first and second abutment inserts (16, 18) is made of a ceramic, a metal or a plastic. ### Claim 13 (depends on 1) The pump as claimed in claim 1, wherein the pump housing (6) further comprises a pump cover (8), in which the first abutment insert (16) and the second abutment insert (18) are arranged. ### Claim 14 (depends on 13) The pump as claimed in claim 13, wherein the first and second abutment inserts (16, 18) are arranged in the pump cover (8). ### Claim 15 (depends on 14) The pump as claimed in claim 14, wherein the pump housing (6) and/or the pump cover (8) are/is formed as an injection molding. ### Claim 16 (depends on 15) The pump as claimed in claim 15, wherein each of the first and second abutment inserts (16, 18) has a receiver (20) for receiving a pressure-exerting pin (22), to orient the first and second abutment inserts (16, 18) for encapsulation to set an angular setting of the first and second abutment inserts (16, 18) with respect to the longitudinal direction (X-X) and/or the transverse direction (Y-Y) of the pump (P). ### Claim 17 (depends on 1) A fuel delivery assembly comprising: an electric motor; and the screw-spindle pump (P) as claimed in claim 1, wherein the screw-spindle pump (P) is driven by the electric motor.