Motors: expansible chamber type – Three or more cylinders arranged in parallel radial or... – Motive fluid bypass to or from assembly
Patent
1985-09-23
1986-11-18
Freeh, William L.
Motors: expansible chamber type
Three or more cylinders arranged in parallel radial or...
Motive fluid bypass to or from assembly
91499, F01B 1304
Patent
active
046228853
DESCRIPTION:
BRIEF SUMMARY
In the technical field of hydraulic piston pumps and engines there are two basic types: axial piston machines and radial piston machines. As the designations indicate, the piston movements are substantially axial or radial relative to the axes of symmetry of the machines. According to the function of the machine, there are variations of these basic types, such as bent axis machines, where the cylinder body is pivoted up at a maximum of .+-.40.degree., and radial piston machines which operate with pivoting pistons. Moreover, in a number of axial piston machines, both of the bent axis type and the in-line type, the cylinder bores are orientated at a slight angle to the axis of the cylinder casing. The angles of inclination which occur are normally up to a maximum of approximately 5.degree..
In the present invention a considerably greater angle of inclination is used for the cylinder bore relative to the axis of the cylinder casing, to allow greater stroke length for the pistons and to make more room for the homokinetic Cardan joint which is used to transmit the piston power developed to the machine shaft as usable torque, and vice versa.
The invention is described in the following with reference to the accompanying drawings, on which
FIG. 1 shows the basic design of the machine,
FIG. 1a shows an enlarged portion of FIG. 1.
FIG. 2 shows a section of the contact surface between a valve plate and the cylinder casing,
FIG. 3 shows a version of the machine which is very similar to the machine shown in FIG. 1 but has the valve plate plan-parallel, and therefore has its hydrostatic bearings acting at a specific angle,
FIG. 3a shows an enlarged portion of FIG. 3 and
FIG. 4 shows a complete machine constructed with 26 pistons and a very large-dimension shaft passing through it.
The basic design of the machine shown in FIG. 1 shows clearly that it has a common centre of rotation 1 for both the cylinder casing 2 and the drive shaft 3. Thus, a so-called in-line machine is involved which, dependent mainly on the number of working pistons 4, can be constructed with a large-dimension shaft 3 through it. By this means two, three or more machines can be connected in a row one after the other to a common drive shaft without the need to instal a costly distributor shaft.
FIG. 1 also shows that spherical pistons 4 are used in the invention, although these are not essential to the invention. Conventional cylindrical pistons with a movable piston rod can be used, but spherical pistons 4 give the smallest dimensions for the cylinder casing 2 and thus for the whole machine.
The cylinder casing 2 with its cylinder bores 5 extending at a considerable angle of inclination .alpha. to the axis of symmetry 1 of the machine can be produced with an arbitrary number of such cylinder bores. For special purposes, diagonal piston engines with up to 26 cylinder bores 5 have been envisaged, which means that a very large through-shaft 3 can be obtained. In this connection, see FIG. 4. The cylinder bores 5 are also formed with the full diameter right through. They therefore have no constriction at the aperture 6 where they adjoin the valve plate 7. The valve plate 7 is shown here with its surface 8 which comes in contact against the cylinder casing 2 formed with conical or spherical shaping. The corresponding surface on the cylinder casing 2 is also conical or spherical.
The hydrostatic forces which arise at the contact surface 8 between the valve plate 7 and the cylinder casing 2 and which urge the cylinder casing 2 away from the valve plate 7 are partly compensated by the loaded area of the working pistons 4, according to a known principle. The remaining force which is required for compensation to the desired extent is developed by the hydrostatic bearings 9 which are disposed in a ring round the axis of rotation 1--one bearing pocket 9 per cylinder bore 5. In the embodiment shown the hydrostatic bearing 9 acts axially, but the bearing may also be designed for another direction of force. The important point is that the sum of the forces and the
REFERENCES:
patent: 1817080 (1931-08-01), Howard
patent: 2718758 (1955-09-01), Minshall
patent: 2895426 (1959-07-01), Orshansky
patent: 3186352 (1965-06-01), Anderson
patent: 3618471 (1971-11-01), Hein et al.
patent: 3657970 (1972-04-01), Kobayashi
patent: 3802321 (1974-04-01), Bosch
patent: 4546692 (1985-10-01), Lotter
LandOfFree
Hydrostatic piston pump or engine having diagonal piston axis does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hydrostatic piston pump or engine having diagonal piston axis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydrostatic piston pump or engine having diagonal piston axis will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1611794