METHOD FOR OPERATING AN AXIAL PISTON MOTOR, AND AXIAL PISTON MOTOR

• US 20190017432A1
• Filed: 01/09/2017
• Published: 01/17/2019
• Est. Priority Date: 01/12/2016
• Status: Active Grant

• Current Assignee: GETAS Gesellschaft fuer thermodynamische Antriebssysteme mbH
• Original Assignee: Getas Gesellschaft Fur Thermodynamische Antriebssysteme mbH
• Inventors: ROHS, Ulrich
• Granted Patent: US 10,450,945 B2
• Time in Patent Office: Days
• CPC Class Codes: F01B 3/04 the piston motion being transmitted by curved surfaces
• CPC Class Codes: F02B 33/06 with reciprocating-piston pumps other than simple crankcase pumps
• CPC Class Codes: F02B 33/30 Control of inlet or outlet ports
• CPC Class Codes: F02B 75/26 Engines with cylinder axes coaxial with, or parallel or inclined to, main-shaft axis; Engines with cylinder axes arranged substantially tangentially to a circle centred on main-shaft axis
• CPC Class Codes: F02B 75/28 Engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders arranged oppositely relative to main shaft F02B75/24
• CPC Class Codes: F02B 75/282 the pistons having equal strokes

Abstract

In an axial piston motor in which fuel and compressed combustion medium are continuously burned in a combustion chamber so as to be turned into the working fluid and successively be delivered to working cylinders, at least one of the compressor discharge valves is closed in a positively controlled manner and is opened by a compressor pressure building up in the respective compressor cylinder.

Claims

1. A method for operation of an axial piston motor (10), in which method fuel and compressed combustion medium are continuously combusted in a combustion chamber (20) to produce working medium, and delivered to successive working cylinders (30), in which working pistons (35) move back and forth, which pistons in turn drive a power take-off (50) and compressor pistons (45), which move back and forth in compressor cylinders (40), in which the combustion medium is compressed, wherein the combustion medium is drawn in by way of compressor inlet valves (41), and the compressed combustion medium is delivered to the combustion chamber (20) by the compressor cylinders (40), by way of compressor outlet valves (42), wherein at least one of the compressor outlet valves (42) is closed with positive control, and opened by way of a compressor pressure that builds up in the respective compressor cylinder (40).

2. The operating method according to claim 1, wherein the closing process of the at least one of the compressor outlet valves (42) is initiated before the related compressor piston (45) reaches its top dead center.

3. The operating method according to claim 2, wherein the closing process of the at least one of the compressor outlet valves (42) is initiated no later than 5°

, preferably no later than 7°

before the related compressor piston (45) reaches its top dead center.

4. The operating method according to claim 1, wherein the at least one of the compressor outlet valves (42) is closed when the related compressor piston (45) reaches its top dead center.

5. The operating method according to claim 1, wherein the at least one of the compressor outlet valves (42) is freely closed by means of its own weight after the closing process has been initiated.

6. The operating method according to claim 1, wherein the at least one of the compressor outlet valves (42) is released before the compression process.

7. The operating method according to claim 1, wherein the at least one of the compressor outlet valves (42) is mechanically driven.

8. The operating method according to claim 1, wherein the at least one of the compressor outlet valves (42) is driven synchronously to a power take-off (50) of the axial piston motor (10).

9. An axial piston motor (10) having a combustion chamber (20) that combusts continuously compressed combustion medium and fuel to produce working medium, having working cylinders (30) that are connected with the combustion chamber (20) by means of shot connections (25) that can open and close cyclically, and in which working pistons (35) move back and forth, having compressor cylinders (40) in which compressor pistons (45) move back and forth, which pistons are driven by the working pistons (45), and having at least one combustion medium feed line (56) that leads from compressor outlet valves (42) of the compressor cylinders (40) to the combustion chamber (20), wherein at least one of the compressor outlet valves (42) has a closure part (71) that opens away from the compressor cylinder (40), wherein the closure part (71), which interacts with a valve drive (60), opens counter to a restriction arrangement (73), and wherein the valve drive (60) can be released in the opening direction (72) and/or acts on the closure part (71) only in the opening direction (72).

10. The axial piston motor (10) according to, claim 9, wherein the valve drive (60) is configured mechanically.

11. The axial piston motor (10) according to claim 9, wherein the valve drive (60) has a press-down arrangement (74) that acts on the closure part (71).

12. The axial piston motor (10) according to claim 11, wherein the press-down arrangement (74) is at a distance from the closure part (71) when the compressor outlet valve (42) is closed.

13. The axial piston motor (10) according to claim 11, wherein the press-down arrangement (74) and the restriction arrangement (73) are situated on a control module (65) and preferably configured in one piece with one another.

14. The axial piston motor (10) according to claim 13, wherein the control module (65) can be displaced between a stress position and a relief position.

15. The axial piston motor (10) according to claim 9, wherein the press-down arrangement, the restriction arrangement and/or the control module are mounted resiliently.

16. The axial piston motor (10) according to claim 9, wherein the one of the compressor outlet valves (42) is a plate valve (80), the valve cover (81) of which is the closure part (71) and on the valve shaft (82) of which the valve drive (60) acts.

17. The axial piston motor (10) according to claim 9, wherein the valve drive (60) has a cam disk (61) or a cam shaft (62), which is synchronized with a power take-off (50) of the axial piston motor (10).

18. The axial piston motor (10) according to claim 9, wherein the valve drive (60) also drives further compressor outlet valves (42) and/or compressor inlet valves (41).