Rotary to reciprocal power transfer device

• US 7,475,627 B2
• Filed: 09/27/2005
• Issued: 01/13/2009
• Est. Priority Date: 09/27/2005
• Status: Active Grant

• Current Assignee: Ragain Air Compressors Incorporated
• Original Assignee: Ragain Air Compressors Incorporated
• Inventors: Irick, David Kim, Ragain, William Parker
• Primary Examiner(s): Lazo; Thomas E
• Application Number:
  US11/235,884
• Publication Number:
  US 20070068468A1
• Time in Patent Office: 1,204 Days
• Field of Search: 92/72, 92/73, 92/76, 921/38, 914/98, 417/62, 417/534
• US Class Current: 92/138
• CPC Class Codes: F01B 9/023 of Bourke-type or Scotch yoke
• CPC Class Codes: F01B 9/06 the piston motion being transmitted by curved surfaces
• CPC Class Codes: F02B 75/24 with cylinders arranged oppositely relative to main shaft and of "flat" type
• CPC Class Codes: F02B 75/32 Engines characterised by connections between pistons and main shafts and not specific to preceding main groups
• CPC Class Codes: F04B 27/005 with two cylinders
• CPC Class Codes: F04B 27/02 having cylinders arranged oppositely relative to main shaft
• CPC Class Codes: F04B 27/0414 Cams
• CPC Class Codes: F04B 5/02 with double-acting pistons

Abstract

An apparatus to transfer power from rotary power to reciprocating power includes an odd numbered multi-lobed rotating cam that acts on a follower, which, in turn, causes or acts in response to reciprocation of pistons. The follower includes offset head portions and the cylinders, in turn are actually offset in the direction of the head portions. This reduces friction and improves efficiency. Further, the cylinders can include two inlets and two outlets so that each cylinder functions when the piston moves in either direction within the cylinder.

Claims

1. A power transfer mechanism between a rotating element and first and second reciprocating devices comprising a multi-lobed rotating cam rotatable with a shaft;

a follower having two bearing surfaces riding on said cam, said follower movable back and forth along a first axis;

said follower having first and second ends fixed to first and second pistons in said first and second devices, said first and second ends being oppositely offset from said first axis wherein said pistons are movable on second and third axes which are offset and parallel to said first axis.

2. The apparatus claimed in claim 1 wherein said follower includes a central body portion with first and second oppositely extended doglegs.

3. The apparatus claimed in claim 1 wherein said cam is a three-lobed cam.

4. The apparatus claimed in claim 1 wherein said reciprocating devices are compressors, said compressors having first and second chambers separated by said piston with first air inlets into said first chambers and first air outlets from said first chambers, and second air inlets into said second chambers and second air outlets from said second chambers.

5. The apparatus claimed in claim 1 wherein said reciprocating devices are internal combustion chambers.

6. The apparatus claimed in claim 1 wherein said follower comprises two mirror image members each having an elongated slot along said first axis;

first and second rollers adapted to contact said cam;

first and second head members each fixed to said first and second body members at opposite ends thereof wherein said head members are fixed to said pistons.

7. The apparatus claimed in claim 6 wherein one of said first head members is resiliently attached to said follower body members.

8. The apparatus claimed in claim 7 wherein said head member attaches to said first and second body members with fasteners, said fasteners each having a head;

a compression member between said heads of said fasteners and said first head member whereby compression of said compression member provides resilience between said first head member and said follower.

9. The apparatus claimed in claim 1 wherein said reciprocating devices are expansion chambers with first fluid inlets into said first chamber and first fluid outlets from said first chamber and second fluid inlets into said second chamber and second fluid outlets from said second chamber.

10. The apparatus claimed in claim 1 wherein said reciprocating devices are expansion chambers and said device is an expansion motor.

11. The apparatus claimed in claim 5 wherein said first and second pistons move in chambers and divide said chamber into inner and outer chambers and wherein said inner and outer chambers each include gas inlets and gas outlets, and fuel inlets.

12. A power transfer device for transferring power between a rotating cam and first and second reciprocating devices, said first and second reciprocating devices each having a chamber and a piston adapted to move in first and second directions within said chamber, said piston dividing said chamber into inner and outer chambers, first and second gas inlets are provided into said inner and outer chambers first and second gas outlets are provided from said inner and outer chambers, and further comprising a multi-lobed rotating cam and a follower, said follower having two bearing surfaces riding on said cam and moving back and forth along a first axis, said follower having first and second ends attached to said pistons, said first and second ends being offset from said axis wherein said pistons move along second and third axes which are parallel to said first axis.

13. The power transfer device claimed in claim 12 wherein first and second reciprocating devices are compressors whereby said pistons compress gas when moving in both first and second directions.

14. A power transfer device comprising:

a rotating multi-lobed cam in a main housing;

lubricant in said main housing;

a follower associated with said cam and first and second rods extending from said follower extending through said housing and connected to pistons, said follower having two bearing surfaces riding on said cam and moving back and forth along a first axis, said follower having first and second ends attached to said pistons, said first and second ends being offset from said axis wherein said pistons move along second and third axes which are parallel to said first axis;

said pistons positioned in cylinders fixed to said housing;

lubricant seals between said housing and said cylinders wherein said rods extend through said seals thereby permitting oil-less operation of said cylinders with positive lubrication of said cam and follower.

15. The device claimed in claim 14 wherein said cylinders are compressors.

16. The device claimed in claim 14 wherein said cylinders are expansion chambers.

17. The device claimed in claim 14 wherein said cylinders are pumps.