Electric gear pump

Patent metadata

Field	Value
Publication number	US-11085441-B2
Application number	US-201716468050-A
Country	US
Kind code	B2
Filing date	Dec 11, 2017
Priority date	Dec 12, 2016
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

An electric gear pump comprising: a gerotor rotatable about an axis of rotation A; a support base for the gerotor; a cover which can be joined to the base; a feed duct and a delivery duct; electronic components of the control unit which are fastened on the outer surface of the cover; wherein the feed and delivery ducts are at least partly formed in the cover and comprise an axial section parallel to the axis A and a radial section parallel to the outer surface of the cover; wherein the outer surface of the cover comprises an inset portion; wherein at least a portion of the radial sections of the feed and delivery ducts is configured so as to project externally from the inset portion of the outer surface of the cover and form projecting support portions for the electronic components of the control unit.

First claim

The invention claimed is:

1. An electric gear pump ( 4 ) comprising:
a gerotor ( 9 ) rotatable about an axis of rotation (A);
a support base ( 24 ) for the gerotor ( 9 );
a cover ( 27 ) joined to the support base ( 24 ), the cover ( 27 ) including an inner surface facing the gerotor ( 9 ) and an outer surface ( 31 ) opposite the inner surface and on an exterior of the gear pump ( 4 );
a feed duct ( 6 ) and a delivery duct ( 7 ); and
electronic components ( 29 ) of a control unit ( 30 ) fastened on the outer surface ( 31 ) of the cover ( 27 );
wherein the feed duct ( 6 ) and the delivery duct ( 7 ) are at least partly formed in the cover ( 27 ) and each comprise an axial portion ( 37 , 38 ) parallel to the axis (A) and an orthogonal portion ( 32 , 33 ) orthogonal to the axis (A);
wherein the outer surface ( 31 ) of the cover ( 27 ) comprises an inset portion ( 34 );
wherein each of the orthogonal portions ( 32 , 33 ) of the feed duct ( 6 ) and of the delivery duct ( 7 ) has a portion which is configured so as to project externally from the inset portion ( 34 ) of the outer surface ( 31 ) of the cover ( 27 ) and which forms a projecting support portion ( 35 , 36 ) for the electronic components ( 29 ) of the control unit ( 30 ),
wherein the projecting support portions ( 35 , 36 ) each have a dome-like section with a flat roof ( 39 ) configured to support the electronic components ( 29 ) of the control unit ( 30 ), and
wherein the cover ( 27 ) has a raised perimetral edge ( 40 ) projecting from the inset portion ( 34 ) of the outer surface ( 31 ) by the same height (h) as the projecting support portions ( 35 , 36 ).

2. The pump as claimed in claim 1 , wherein a section of the feed duct ( 6 ) and the delivery duct ( 7 ) is flush with the inset portion ( 34 ) of the outer surface ( 31 ) of the cover ( 27 ).

3. The pump as claimed in claim 1 , wherein the projecting support portions ( 35 , 36 ) are flush with the raised perimetral edge ( 40 ).

4. The pump as claimed in claim 1 , having at least one projection with respect to the outer surface ( 31 ) of the cover ( 27 ), and wherein the at least one projection projects from the outer surface ( 31 ) of the cover ( 27 ) by a height less than that of the projecting support portions ( 35 , 36 ).

5. The pump as claimed in claim 1 , having at least one projection with respect to the outer surface ( 31 ) of the cover ( 27 ), and wherein the at least one projection is flush with the projecting portions ( 35 , 36 ).

6. A pump assembly for feeding fuel from a tank ( 2 ) to an internal combustion engine ( 3 ); the pump assembly ( 1 ) comprising in series a high-pressure pump ( 5 ) and a low-pressure electric gear pump ( 4 ) according to claim 1 .

7. The pump as claimed in claim 1 , wherein one of the projecting support portions ( 35 , 36 ) extends in a first direction, and wherein another one of the projecting support portions ( 35 , 36 ) extends in a second direction that intersects the first direction.

8. The pump as claimed in claim 1 , wherein the inset portion ( 34 ) is substantially planar, and wherein the orthogonal portions ( 32 , 33 ) are parallel to the inset portion ( 34 ).

9. The pump as claimed in claim 1 , wherein the inset portion ( 34 ) is substantially planar.

10. The pump as claimed in claim 9 , wherein the inset portion ( 34 ) is perpendicular to the axis (A).

11. The pump as claimed in claim 9 , wherein the flat roofs ( 39 ) are parallel to the inset portion ( 34 ).

12. The pump as claimed in claim 1 , wherein each of the orthogonal portions ( 32 , 33 ) of the feed duct ( 6 ) and of the delivery duct ( 7 ) has another portion which is configured so as to project inward of the inset portion.

Assignees

• Bosch Gmbh Robert

Inventors

• Scamarcio Antonio
• Medoro Nello

Classifications

• F02M37/041

  Arrangements for driving gear-type pumps · CPC title

• F04C2240/808

  Electronic circuits (e.g. inverters) installed inside the machine · CPC title

• F02M63/0225

  Fuel-injection apparatus having a common rail feeding several injectors (F02M63/0003 takes precedence); Means for varying pressure in common rails; Pumps feeding common rails · CPC title

• H02K11/33

  Drive circuits, e.g. power electronics (H02K11/38 takes precedence) · CPC title

• F04C15/008

  Prime movers · CPC title