Screw Spindle Pump, Fuel Pump Assembly, and Fuel Pump Unit

• US 20200132070A1
• Filed: 06/18/2018
• Published: 04/30/2020
• Est. Priority Date: 06/27/2017
• Status: Active Grant

• Current Assignee: Vitesco Technologies GmbH (Continental AG)
• Original Assignee: CPT Group GmbH (Continental AG)
• Inventors: DEICHMANN, Johannes, GONNERMANN, Tim, VOLKER, Marc
• Granted Patent: US 11,293,433 B2
• Time in Patent Office: Days
• CPC Class Codes: F01C 21/02 Arrangements of bearings bearing constructions F16C
• CPC Class Codes: F01C 21/108 with an axial surface, e.g. side plates
• CPC Class Codes: F04C 11/008 Enclosed motor pump units
• CPC Class Codes: F04C 15/0042 Systems for the equilibration of forces acting on the machines or pump interstice adjustment other than by fluid pressure F01C21/102
• CPC Class Codes: F04C 2/082 Details specially related to intermeshing engagement type machines or pumps
• CPC Class Codes: F04C 2/16 with helical teeth, e.g. chevron-shaped, screw type for non-parallel axes of movement F04C3/00
• CPC Class Codes: F04C 2/165 having more than two rotary pistons with parallel axes
• CPC Class Codes: F04C 2210/1044 Fuel
• CPC Class Codes: F04C 2230/60 Assembly methods
• CPC Class Codes: F04C 2240/30 Casings or housings

Abstract

A screw-spindle pump comprising: first and second screw spindles forming running and drive spindles, respectively, and a pump housing configured to receive the first and second screw spindles. The first and second screw spindles form, with at least the pump housing, delivery chambers, moving from a suction side to a pressure side of the pump as a consequence due to rotation of the screw spindles. The pump housing has an elongate insert, as an abutment for the first and second screw spindles and against which the first and second screw spindles are supported, the elongate insert having a first portion forming a first abutment for the second screw spindle and a second portion forming a second abutment for the first screw spindle. The elongate insert is clamped into a receptacle of the pump housing using a cross-sectional dimension of the elongate insert.

Claims

1-15. -15. (canceled)

16. A screw-spindle pump comprising:

a first screw spindle (14) and a second screw spindle (16), wherein the second screw spindle (16) is a drive spindle and the first screw spindle (14) is a running spindle that runs oppositely with respect to the second screw spindle (16), and

a pump housing (10) configured to receive the first and second screw spindles (14, 16),

wherein the first and second screw spindles (14, 16) form, together with at least the pump housing (10), delivery chambers (18), which move from a suction side (20) of the pump to a pressure side (22) of the pump as a consequence of a rotation of the first and second screw spindles (14, 16),

wherein the pump housing (10) has an elongate insert (8), as an abutment for the first and second screw spindles (14, 16) and against which the first and second screw spindles (14, 16) are supported, the elongate insert (8) having a first portion forming a first abutment for the second screw spindle (16) and a second portion forming a second abutment for the first screw spindle (14), and

wherein the elongate insert (8) is clamped into a corresponding receptacle of the pump housing (10, 12) using a cross-sectional dimension of the elongate insert (8).

17. The pump as claimed in claim 16, wherein the elongate insert (8) has a width cross-sectional dimension and a height cross-sectional dimension, and the cross-sectional dimension of the elongate insert (8) that is clamped is one of the width cross-sectional dimension and the height cross-sectional dimension.

18. The pump as claimed in claim 17, wherein the width cross-sectional dimension is equal to the height cross-sectional dimension.

19. The pump as claimed in claim 18, wherein the pump housing (10) has at least one sectionally formed projection (26a, 26b), as a receptacle, that extends from the pump housing (10) into an inlet opening (6) of the pump housing (10) transverse to a longitudinal direction (X-X) of the pump housing, wherein the elongate insert (8) is clamped at the at least one projection.

20. The pump as claimed in claim 19, wherein the at least one sectionally formed projection comprises a first projection (26a) and a second projection (26b), which together comprise the receptacle, wherein the first and second projections extend into the inlet opening (6) of the pump housing (10), wherein the elongate insert (8) is clamped between the first and second projections (26a, 26b).

21. The pump as claimed in claim 20, wherein the first and second projections (26a, 26b) are arranged orthogonal to the longitudinal direction (X-X) of the pump (4).

22. The pump as claimed in claim 21, further comprising a pump housing section (24) arranged transverse to the longitudinal direction (X-X) of the pump (4) and on which the first and second projections (26a, 26b) are formed.

23. The pump as claimed in claim 22, wherein the pump housing section (24) is arranged orthogonal to the longitudinal direction (X-X) of the pump (4).

24. The pump as claimed in claim 23, wherein the first projection (26a) and the second projection (26b) are arranged on the pump housing (10, 24) so as to diametrically oppose one another.

25. The pump as claimed in claim 16, wherein the elongate insert (8) is cuboidal or prismatic in shape.

26. The pump as claimed in claim 16, wherein the elongate insert (8) is made from one selected from the group of:

a ceramic, a metal and a plastic.

27. The pump as claimed in claim 20, wherein the pump housing (10) has a pump cover (12), in which the elongate insert (8) is clamped between the first and second projections (26a, 26b).

28. The pump as claimed in claim 27, wherein the pump housing (10) and/or the pump cover (12) are/is formed as injection moldings/an injection molding.

29. A fuel delivery assembly comprising:

an electric motor; and

the screw-spindle pump (4) as claimed in claim 16,

wherein the electric motor is configured to drive the screw-spindle pump (4).

30. A fuel delivery unit for use in a fuel tank of a vehicle, comprising a fuel delivery assembly as claimed in claim 29, and having a swirl pot in which the fuel delivery assembly is arranged to deliver fuel from the swirl pot to an internal combustion engine.