Opposed piston two-stroke engine with thermal barrier

Patent metadata

Field	Value
Publication number	US-2016069293-A1
Application number	US-201514828689-A
Country	US
Kind code	A1
Filing date	Aug 18, 2015
Priority date	Sep 9, 2014
Publication date	Mar 10, 2016
Grant date	—

Abstract

In one configuration, the present disclosure provides a cylinder including a first housing, a second housing, and an insert. The first housing includes a first body portion and a first collar portion. The first body portion has a first inner diameter, and the first collar portion has a second inner diameter that is greater than the first inner diameter. The second housing includes a second body portion and a second collar portion. The second body portion has a third inner diameter and the second collar portion has a fourth inner diameter that is greater than the third inner diameter. The second housing is coupled to the first housing such that the first and second collared portions cooperate to form an annular channel. The insert is disposed within the annular channel formed by the first and second collared portions.

First claim

What is claimed is:

1 . A cylinder, comprising:
a first housing including a first body portion and a first collar portion, the first body portion having a first inner diameter, the first collar portion having a second inner diameter that is greater than the first inner diameter; a second housing including a second body portion and a second collar portion, the second body portion having a third inner diameter, the second collar portion having a fourth inner diameter that is greater than the third inner diameter, wherein the second housing is coupled to the first housing such that the first and second collared portions cooperate to form an annular channel; and an insert disposed within the annular channel formed by the first and second collared portions.

2 . The cylinder of claim 1 , wherein first and second housings are formed from a first material having a first heat transfer coefficient and the insert is formed from a second material having a second heat transfer coefficient that is less than the first heat transfer coefficient.

3 . The cylinder of claim 1 , wherein the insert is constructed from a ceramic.

4 . The cylinder of claim 3 , wherein the ceramic is zirconia.

5 . The cylinder of claim 1 , wherein the first housing and the second housing overlap one another at a junction of the first collar portion and the second collar portion.

6 . The cylinder of claim 5 , wherein the insert overlaps the junction.

7 . The cylinder of claim 5 , wherein the first housing is attached to the second housing at the junction.

8 . The cylinder of claim 7 , wherein the first collar portion includes a first series of threads and the second collar portion includes a second series of threads, the first series of threads engaging the second series of threads to attach the first housing to the second housing.

9 . The cylinder of claim 1 , wherein the first housing includes a first threaded portion and the second housing includes a second threaded portion, the first threaded portion being threadably coupled to the second threaded portion to attach the first housing to the second housing.

10 . The cylinder of claim 9 , wherein the first threaded portion is a threaded inner surface of the first housing and the second threaded portion is a threaded outer surface of the second housing.

11 . The cylinder of claim 9 , wherein the insert is concentrically disposed within the first threaded portion and the second threaded portion.

12 . The cylinder of claim 1 , wherein the first body portion defines a first plurality of ports arranged circumferentially about the first body portion, and the second body portion defines a second plurality of ports arranged circumferentially about the second body portion.

13 . An opposed-piston engine, comprising:
a first housing including a first inner surface defining a first chamber; a second housing coupled to the first housing and including a second inner surface defining a second chamber; a first piston slidably disposed within the first chamber; a second piston slidably disposed within the second chamber; and a liner coupled to at least one of the first housing and the second housing, the liner including a third inner surface defining a third chamber in fluid communication with the first chamber and the second chamber, wherein the first and second pistons are operable to slide within the liner.

14 . The opposed-piston engine of claim 13 , wherein the first inner surface defines a first diameter, the second inner surface defines a second diameter that is substantially equal to the first diameter, and the third inner surface defines a third diameter that is substantially equal to the first diameter and the second diameter.

15 . The opposed-piston engine of claim 14 , wherein the first inner surface, the second inner surface, and the third inner surface are coaxial.

16 . The opposed-piston engine of claim 14 , wherein the first inner surface, the second inner surface, and the third inner surface are substantially flush with one another.

17 . The opposed-piston engine of claim 14 , wherein the first housing includes a first collar portion having a fourth inner surface defining a fourth diameter that is greater than the first diameter, and wherein the liner is coupled to the fourth inner surface.

18 . The opposed-piston engine of claim 17 , wherein the second housing includes a second collar portion having a fifth inner surface defining a fifth diameter that is greater than the second diameter, and wherein the liner is coupled to the fifth inner surface.

19 . The opposed-piston engine of claim 18 , wherein the fourth diameter is substantially equal to the fifth diameter.

20 . The opposed-piston engine of claim 13 , wherein the first housing and the second housing cooperate to define an annular channel, the liner being disposed within the annular channel.

21 . The opposed-piston engine of claim 20 , wherein the first inner surface defines a first diameter, the second inner surface defines a second diameter that is substantially equal to the first diameter, and the third inner surface defines a third diameter that is substantially equal to the first diameter and the second diameter.

22 . A piston having a first portion formed from a first material and a second portion formed from a second material, the first portion defining a substantially cylindrical construct extending from a first end to a second end and having a first outer diameter, the second portion coupled to the first end of the first portion and defining a second outer diameter substantially equal to the first outer diameter, the first material being configured to absorb heat at a first rate, and the second material being configured to absorb heat at a second rate that is less than the first rate.

23 . A piston including a first portion, a second portion, and a third portion, the second portion disposed between the first portion and the third portion, the second portion including a different material than the first portion and the third portion and having an outer surface that is substantially flush with an outer surface of the first portion and an outer surface of the third portion.

24 . The piston of claim 23 , wherein said third portion is formed from a material that absorbs heat at a lesser rate than a material of the first portion and the second portion.

25 . The piston of claim 24 , wherein the material of the third portion is ceramic.

Assignees

• Avl Powertrain Engineering Inc

Inventors

• Mcclearen James
• Hunter Gary L

Classifications

• F05C2251/048

  Heat transfer · CPC title

• F02F1/186

  for use in engines with two or more pistons reciprocating within same cylinder · CPC title

• F02B75/02 Primary

  Engines characterised by their cycles, e.g. six-stroke · 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

• F02B2075/025

  two · CPC title