Free piston engine
First Claim
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1. A free-piston engine comprising:
- an engine piston driven through a stepped hydraulic piston, said stepped hydraulic piston having a smaller-diameter portion thereof arranged in a work cylinder and a large-diameter portion thereof in a compression cylinder that is subjected to pressure medium from a pressure medium accumulator via a starting valve during the compression stroke, wherein during the compression stroke or the expansion stroke pressure medium is sucked into said work cylinder from a low-pressure accumulator and wherein during the expansion stroke the pressure medium is employed in one of said cylinders for charging a pressure medium accumulator, and wherein said pressure medium accumulator is a high-pressure accumulator which is connected both with said work cylinder and with said compression cylinder.
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Abstract
A free-piston engine has a stepped piston having a larger end face thereof guided in the compression cylinder, and a smaller end face in the work cylinder. Both the work cylinder and the compression cylinder are connected with a common high-pressure accumulator for initiating the compression stroke or for charging during the expansion stroke.
25 Citations
16 Claims
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1. A free-piston engine comprising:
an engine piston driven through a stepped hydraulic piston, said stepped hydraulic piston having a smaller-diameter portion thereof arranged in a work cylinder and a large-diameter portion thereof in a compression cylinder that is subjected to pressure medium from a pressure medium accumulator via a starting valve during the compression stroke, wherein during the compression stroke or the expansion stroke pressure medium is sucked into said work cylinder from a low-pressure accumulator and wherein during the expansion stroke the pressure medium is employed in one of said cylinders for charging a pressure medium accumulator, and wherein said pressure medium accumulator is a high-pressure accumulator which is connected both with said work cylinder and with said compression cylinder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A free-piston engine comprising:
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an engine piston driven through a stepped hydraulic piston, said stepped hydraulic piston having a smaller-diameter portion thereof arranged in a work cylinder and a large-diameter portion thereof in a compression cylinder that is subjected to pressure medium from a pressure medium accumulator via a starting valve during the compression stroke, wherein pressure medium is sucked into said work cylinder from a low-pressure accumulator, while during the expansion stroke the pressure medium is employed in one of said cylinders for charging a pressure medium accumulator, and wherein said pressure medium accumulator is a high-pressure accumulator which is connected both with said work cylinder and with said compression cylinder;
wherein a larger end face of said hydraulic piston is connected with said high-pressure accumulator, and a smaller annular end face of said piston is connected with said high-pressure accumulator via a check valve or with said low-pressure accumulator via a second check valve including a directional control valve, the piston of which permits to control open a bypass line bypassing said starting valve. - View Dependent Claims (10, 11)
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12. A free-piston engine comprising:
an engine piston driven through a stepped hydraulic piston, said stepped hydraulic piston having a smaller-diameter portion thereof arranged in a work cylinder and a large-diameter portion thereof in a compression cylinder that is subjected to pressure medium from a pressure medium accumulator via a starting valve during the compression stroke, wherein pressure medium is sucked into said work cylinder from a low-pressure accumulator, while during the expansion stroke the pressure medium is employed in one of said cylinders for charging a pressure medium accumulator, and wherein said pressure medium accumulator is a high-pressure accumulator which is connected both with said work cylinder and with said compression cylinder including a piston retracting valve arrangement whereby said compression cylinder is connected with at least one of a group including said tank and said high-pressure accumulator. - View Dependent Claims (13, 14, 15, 16)
Specification