Stirling cycle machine

• US 8,474,256 B2
• Filed: 04/18/2008
• Issued: 07/02/2013
• Est. Priority Date: 04/23/2007
• Status: Active Grant

• Current Assignee: New Power Concepts LLC
• Original Assignee: New Power Concepts LLC
• Inventors: Kamen, Dean, Langenfeld, Christopher C., Bhat, Prashant, Smith, Stanley B. III
• Primary Examiner(s): Bomberg, Kenneth
• Assistant Examiner(s): JETTON, CHRISTOPHER M
• Application Number:
  US12/105,854
• Publication Number:
  US 20080314356A1
• Time in Patent Office: 1,901 Days
• Field of Search: 123/197.3, 123/197.4, 60516-526
• US Class Current: 60/525
• CPC Class Codes: F01B 7/12 using rockers and connecting-rods
• CPC Class Codes: F02G 1/043 the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
• CPC Class Codes: F02G 1/0435 the engine being of the free piston type
• CPC Class Codes: F02G 1/044 having at least two working members, e.g. pistons, delivering power output
• CPC Class Codes: F02G 1/0535 Seals or sealing arrangements
• CPC Class Codes: F02G 2244/08 having parallel cylinder, e.g. "Rider" engines
• CPC Class Codes: F02G 2253/03 Stem seals
• CPC Class Codes: F02G 2253/08 Stem with rolling membranes
• CPC Class Codes: F02G 2253/80 Sealing of the crankcase
• CPC Class Codes: F02G 2270/45 Piston rods
• CPC Class Codes: F02G 2270/50 Crosshead guiding pistons
• CPC Class Codes: F02G 2270/85 Crankshafts
• CPC Class Codes: F16C 11/04 Pivotal connections hinges for doors, windows or wings E05D
• CPC Class Codes: F16C 11/12 incorporating flexible connections, e.g. leaf springs
• CPC Class Codes: F16C 9/04 Connecting-rod bearings; Attachments thereof
• CPC Class Codes: F16J 15/52 by means of sealing bellows or diaphragms connection of valves to inflatable elastic bodies B60C29/00
• CPC Class Codes: F16J 3/06 Bellows pistons

Abstract

A Stirling cycle machine. The machine includes at least one rocking drive mechanism which includes: a rocking beam having a rocker pivot, at least one cylinder and at least one piston. The piston is housed within a respective cylinder and is capable of substantially linearly reciprocating within the respective cylinder. Also, the drive mechanism includes at least one coupling assembly having a proximal end and a distal end. The proximal end is connected to the piston and the distal end is connected to the rocking beam by an end pivot. The linear motion of the piston is converted to rotary motion of the rocking beam. Also, a crankcase housing the rocking beam and housing a first portion of the coupling assembly is included. A crankshaft coupled to the rocking beam by way of a connecting rod is also included. The rotary motion of the rocking beam is transferred to the crankshaft. The machine also includes a working space housing the at least one cylinder, the at least one piston and a second portion of the coupling assembly. A seal is included for sealing the workspace from the crankcase.

Claims

1. A rocking beam drive mechanism for a machine comprising:

a rocking beam having a rocker pivot;

at least one cylinder comprising a closed end and an open end, the open end further comprising a linear bearing connected to the cylinder, the linear bearing having an opening to accommodate at least one coupling;

at least one piston, the piston housed within a respective cylinder whereby the piston is capable of substantially linearly reciprocating within the respective cylinder;

the at least one coupling having a proximal end and a distal end, the proximal end being connected to the piston and the distal end being connected to the rocking beam by an end pivot, wherein the linear bearing opening accommodates the coupling and whereby linear motion of the piston is converted to rotary motion of the rocking beam;

a crankcase housing the rocking beam and housing a first portion of the coupling;

a working space housing the at least one cylinder, the at least one piston and a second portion of the coupling;

a lubricating fluid pump in the crankcase; and

a seal sealably connected to the piston rod wherein the seal is a rolling diaphragm comprising non-woven fabric and wherein the seal maintains the lubricating fluid in the crankcase.

2. The rocking beam drive mechanism of claim 1 further comprising a connecting rod, wherein the rocking beam is coupled to a crankshaft by way of the connecting rod and whereby the rotary motion of the rocking beam is transferred to the crankshaft.

3. The rocking beam drive mechanism of claim 1 the coupling further comprising:

a link rod, the piston rod and link rod coupled together by another coupling, the another coupling being located beneath the linear bearing.

4. The rocking beam drive mechanism of claim 3 wherein the another coupling is a flexible joint.

5. The rocking beam drive mechanism of claim 3 wherein the another coupling is a roller bearing.

6. The rocking beam drive mechanism of claim 3 wherein the another coupling is a hinge.

7. The rocking beam drive mechanism of claim 3 wherein the another coupling is a flexure.

8. The rocking beam drive mechanism of claim 3 wherein the another coupling is a journal bearing joint.

9. A Stirling cycle machine comprising:

at least one rocking drive mechanism comprising;

a rocking beam having a rocker pivot;

at least one cylinder comprising a closed end and an open end, the open end further comprising a linear bearing connected to the cylinder, the linear bearing having an opening to accommodate at least one coupling;

at least one piston, the piston housed within a respective cylinder whereby the piston is capable of substantially linearly reciprocating within the respective cylinder; and

the at least one coupling having a proximal end and a distal end, the proximal end being connected to the piston and the distal end being connected to the rocking beam by an end pivot, wherein the linear bearing opening accommodates the coupling and whereby linear motion of the piston is converted to rotary motion of the rocking beam;

a crankcase housing the rocking beam and housing a first portion of the coupling;

a lubricating fluid pump in the crankcase;

a crankshaft coupled to the rocking beam by way of a connecting rod, whereby the rotary motion of the rocking beam is transferred to the crankshaft;

a working space housing the at least one cylinder, the at least one piston and a second portion of the coupling; and

a seal for sealing the workspace from the crankcase, wherein the seal is a rolling diaphragm comprising non-woven fabric.

10. The Stirling cycle machine of claim 9 the coupling further comprising:

a piston rod; and

a link rod, the piston rod and link rod coupled together by another coupling.

11. The Stirling cycle machine of claim 9 wherein the lubricating fluid pump is a mechanical lubricating fluid pump driven by a pump drive assembly, the pump drive assembly being connected to and driven by the crankshaft.

12. The Stirling cycle machine of claim 9 wherein the lubricating fluid pump is an electric lubricating fluid pump.

13. The Stirling cycle machine of claim 9 further comprising a motor connected to the crankshaft.

14. The Stirling cycle machine of claim 9 further comprising a generator connected to the crankshaft.

15. A Stirling cycle machine comprising:

at least two rocking drive mechanisms comprising;

a rocking beam having a rocker pivot;

two cylinders, each cylinder comprising a closed end and an open end, the open end further comprising a linear bearing connected to the cylinder, the linear bearing having an opening to accommodate a coupling;

two pistons, the pistons each housed within a respective cylinder whereby the pistons are capable of substantially linearly reciprocating within the respective cylinder; and

two couplings a having a proximal end and a distal end, the proximal end being connected to the piston and the distal end being connected to the rocking beam by an end pivot, wherein the linear bearing opening accommodates at least one coupling and whereby linear motion of the piston is converted to rotary motion of the rocking beam;

a crankcase housing the rocking beam and housing a first portion of the couplings;

a crankshaft coupled to the rocking beam by way of a connecting rod, whereby the rotary motion of the rocking beam is transferred to the crankshaft;

a lubricating fluid pump in the crankcase for pumping lubricating fluid to lubricate the crankshaft and the rocking beam and the first portion of the couplings;

a working space housing the cylinders, the pistons and the second portion of the couplings; and

a rolling diaphragm comprising non-woven fabric for sealing the workspace from the crankcase.

16. The Stirling cycle machine of claim 15 the couplings further comprising:

a piston rod; and

a link rod, the piston rod and link rod coupled together by another coupling.

17. The Stirling cycle machine of claim 16 wherein the another coupling is a flexible joint.

18. The Stirling cycle machine of claim 16 wherein the another coupling is a roller bearing.