Uniflow engine with fluid flow arrangement

Patent metadata

Field	Value
Publication number	US-10309295-B2
Application number	US-201415512558-A
Country	US
Kind code	B2
Filing date	Sep 29, 2014
Priority date	Sep 29, 2014
Publication date	Jun 4, 2019
Grant date	Jun 4, 2019

Abstract

A uniflow engine includes a cylinder having a cylinder wall, an inlet channel, an extension of a central axis of the inlet channel first intersecting the cylinder wall in a first portion of the cylinder and next intersecting the cylinder wall in a second portion of the cylinder opposite the first portion of the cylinder, an intake air gallery, the intake air gallery having a gallery wall and being in flow communication with the inlet channel, and a plurality of intake ports extending between the cylinder wall and the gallery wall, at least some of the intake ports having different areas at the cylinder wall measured perpendicular to longitudinal axes of the intake ports, and wherein an area of at least one in take port in the first portion of the cylinder is larger than an area of at least one intake port in the second portion of the cylinder.

First claim

What is claimed is:

1. A uniflow engine, comprising:
a cylinder having a cylinder wall;
an inlet channel, an extension of a central axis of the inlet channel first intersecting the cylinder wall in a first portion of the cylinder and next intersecting the cylinder wall in a second portion of the cylinder opposite the first portion of the cylinder;
an intake air gallery, the intake air gallery having a gallery wall and being in flow communication with the inlet channel; and
a plurality of intake ports extending between the cylinder wall and the gallery wall, at least some of the intake ports having different areas at the cylinder wall measured perpendicular to longitudinal axes of the intake ports, and wherein an area of at least one of the intake ports in the first portion of the cylinder is larger than an area of at least one of the intake ports in the second portion of the cylinder, and wherein the longitudinal axes of a majority of the intake ports form an angle of 10° or less to the central axis of the inlet channel,
wherein the first portion of the cylinder is a first half of the cylinder and the second portion of the the cylinder is a second half of the cylinder, and a greater number of the plurality of intake ports is disposed in the second half of the cylinder than in the first half the cylinder.

2. The uniflow engine as set forth in claim 1 , wherein the area of the at least one of the intake ports disposed in the first portion of the cylinder is larger than the area of another one of the intake ports located substantially diametrically opposite the at least one of the intake ports disposed in the first portion of the cylinder.

3. The uniflow engine as set forth in claim 1 , wherein areas of the intake ports decrease in area from a maximum area of at least one of the intake ports closest to a center of the first portion of the cylinder to a minimum area of at least one other one of the intake ports located substantially diametrically opposite the at least one of the intake ports closest to the center of the first portion of the cylinder.

4. The uniflow engine as set forth in claim 3 , wherein at least one of the intake ports between the at least one of the intake ports closest to the center of the first portion of the cylinder and the at least one other one of the intake ports located substantially diametrically opposite the at least one of the intake ports closest to the center of the first portion of the cylinder has an area between the maximum area and the minimum area.

5. The uniflow engine as set forth in claim 1 , wherein the longitudinal axes of at least some of the intake ports are substantially coincident with radii of the cylinder that intersect respective ones of the at least some of the intake ports.

6. The uniflow engine as set forth in claim 1 , wherein the longitudinal axes of at least some of the intake ports are substantially parallel to the central axis of the inlet channel.

7. The uniflow engine as set forth in claim 1 , wherein the longitudinal axes of at least some of the intake ports are nonparallel to the central axis of the inlet channel.

8. The uniflow engine as set forth in claim 1 , wherein the intake ports are longer in a direction parallel to a longitudinal axis of the cylinder than in a direction of the circumference of the cylinder.

9. The uniflow engine as set forth in claim 1 , wherein a total area of all of the intake ports in the first half of the cylinder combined is greater than a total area of all of the intake ports in the second half of the cylinder combined.

10. The uniflow engine as set forth in claim 1 , wherein a cross-sectional area of the intake air gallery decreases from a largest gallery area closest to the first portion of the cylinder to a smallest gallery area closest to the second portion of the cylinder.

11. The uniflow engine as set forth in claim 1 , wherein a portion of the gallery wall closest to a position of minimum volume in the cylinder defines an acute angle greater than 0° with a longitudinal axis of the cylinder.

12. The uniflow engine as set forth in claim 1 , wherein the central axis of the inlet channel defines an acute angle greater than 0° with a longitudinal axis of the cylinder.

13. The uniflow engine as set forth in claim 1 , further comprising an outlet channel, an exhaust air gallery extending around at least a majority of a circumference of the cylinder, the exhaust air gallery having an exhaust air gallery wall and being in flow communication with the outlet channel, and a plurality of exhaust ports extending between the cylinder wall and the exhaust air gallery wall.

14. The uniflow engine as set forth in claim 13 , wherein exhaust ports of the plurality of exhaust ports are spaced at equal angles around the circumference of the cylinder.

15. The uniflow engine as set forth in claim 13 , wherein all exhaust ports of the plurality of exhaust ports are of equal size.

16. The uniflow engine as set forth in claim 1 , comprising a piston disposed in the cylinder, a mean face of the piston defining a non-zero angle with a plane perpendicular to a longitudinal axis of the cylinder.

17. The uniflow engine as set forth in claim 16 , wherein a lowest part of the mean face of the piston furthest from a position of minimum volume in the cylinder is adjacent the first portion of the cylinder.

18. The uniflow engine as set forth in claim 17 , wherein a highest part of the mean face of the piston closest to the position of minimum volume in the cylinder is adjacent the second portion of the cylinder.

19. The uniflow engine as set forth in claim 16 , wherein the uniflow engine is an opposed piston engine, the piston is an intake piston, the uniflow engine comprising an exhaust piston disposed in the cylinder.

20. The uniflow engine as set forth in claim 19 , comprising at least one fuel injector for injecting fuel into the cylinder, wherein a portion of the exhaust piston closest to the at least one fuel injector includes a recess.

21. The uniflow engine as set forth in claim 20 , wherein at least a portion of the at least one fuel injector extends into the cylinder, the at least a portion of the at least one fuel injector being disposed in the recess when the exhaust piston is at a position of minimum volume of the exhaust piston.

22. The uniflow engine as set forth in claim 16 , wherein the uniflow engine is an opposed piston engine, the piston is an intake piston, a second piston is an exhaust piston, and the intake piston and the exhaust piston are disposed in the cylinder and define an enclosed chamber.

23. The uniflow engine as set forth in claim 1 , wherein the intake gallery extends around at least a majority of a circumference of the cylinder.

24. A uniflow engine, comprising:
a cylinder having a cylinder wall;
an inlet channel, an extension of a central axis of the inlet channel first intersecting the cylinder wall in a first portion of the cylinder and next intersecting the cylinder wall in a second portion of the cylinder opposite the first portion of the cylinder;
an intake air gallery, the intake air gallery having a gallery wall and being in flow communication with the inlet channel;
a plurality of intake ports extending between the cylinder wall and the gallery wall, at least some of the intake ports having different areas at the cylinder wall measured perpendicular to longitudinal axes of the intake ports, and wherein an area of at least one of the intake por

Assignees

• Volvo Truck Corp

Inventors

• Morton Richard Kellogg

Classifications

• F02B25/08 Primary

  Engines with oppositely-moving reciprocating working pistons · CPC title

• F02B25/04

  Engines having ports both in cylinder head and in cylinder wall near bottom of piston stroke · CPC title

• F02B2720/236

  scavenging or charging channels or openings · CPC title

• F02F1/22

  characterised by having ports in cylinder wall for scavenging or charging · CPC title

• F02B75/28

  Engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders (arranged oppositely relative to main shaft F02B75/24) · CPC title