Pumps – Expansible chamber type – Pumping member position controlled port
Reexamination Certificate
2000-08-04
2002-03-19
Walberg, Teresa (Department: 3742)
Pumps
Expansible chamber type
Pumping member position controlled port
C417S269000
Reexamination Certificate
active
06358025
ABSTRACT:
BACKGROUND OF THE INVENTION
A hydraulic piston engine is known from European Patent Reference EP-A1-0 567 805, having a number of axial cylinders, which are circumferentially arranged in a rotatable cylinder barrel. Each of the cylinders is provided with a channel, which alternatingly communicates with an inlet port or an outlet port in a housing. From this reference it is apparent that the dimension of the channel in the radial direction of the cylinder barrel is considerably less than the diameter of the cylinder assuming that the channel has a circular cross sectional shape. The cross sectional area of the channel is also considerably less than the cross sectional area of the corresponding cylinder. The result is that the maximum flow capacity of the cylinders and the total capacity of the engine is not fully utilized.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a hydraulic rotating axial piston engine of the above discussed type having maximum flow capacity for a certain volume of the cylinders.
The present object is obtained by means of an engine according to the present invention, where the channels open to the cylinders along the peripheral wall of each cylinder. The opening to the cylinders has substantially the same area as the area of the ports of the barrel and extends completely outside the nearest end position of the piston in each cylinder.
The hydraulic rotating axial piston engine of the present invention has a housing enclosing a cylinder barrel journalled in the housing for rotation around a barrel axis, and a number of circumferentially arranged cylinders in the barrel with a number of pistons reciprocating between two defined end positions. The pistons cooperate with an angled plate in order to obtain the reciprocating movement. The axial piston engine has an input/output shaft. The cylinder barrel has channels connecting each cylinder to ports in the cylinder barrel, the ports alternatively acting as inlet and outlet ports. The housing has at least one inlet and outlet channel, each having a kidney shaped port, facing towards the inlet and outlet ports of the cylinder barrel. The kidney shaped ports communicate with a number of the ports at the barrel. At least a number of the cylinder barrel ports extend in both directions outside the cylinders in the two circumferential directions of the cylinder barrel.
Further features of the present invention will become apparent to those skilled in the art upon reviewing the following specification and attached drawings.
REFERENCES:
patent: 3793924 (1974-02-01), Eickmann
patent: 3834281 (1974-09-01), Heyl et al.
patent: 4223594 (1980-09-01), Gherner
patent: 4920860 (1990-05-01), Alm et al.
patent: 4934253 (1990-06-01), Berthold et al.
patent: 5176066 (1993-01-01), Kanamaru et al.
patent: 5253983 (1993-10-01), Suzuki et al.
patent: 5358388 (1994-10-01), Schutten et al.
patent: 5593285 (1997-01-01), Watts
patent: 5603609 (1997-02-01), Kadlicko
patent: 5636561 (1997-06-01), Pecorari
patent: 6092457 (2000-07-01), Inoue et al.
patent: 6287086 (2001-09-01), Steen
patent: 592 812 (1977-11-01), None
patent: 0 567 805 (1993-04-01), None
patent: 2582738 (1985-05-01), None
patent: 431 897 (1984-05-01), None
Copy of the International Application Published Under the PCT in Case No. PCT/SE98/02218.
Copy of the International Application Published Under the PCT in Case No. PCT/SE99/00186.
Copy of the International Application Published Under the PCT in Case No. PCT/SE99/00187.
Fastovsky Leonid M
Hunter Christopher H.
Parker Hannifin AB
Walberg Teresa
LandOfFree
Hydraulic rotating axial piston engine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hydraulic rotating axial piston engine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic rotating axial piston engine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2830987