Expansible chamber devices – Displacement control of plural cylinders arranged in... – Parallel cylinders
Patent
1997-12-04
1999-07-27
Ryznic, John E.
Expansible chamber devices
Displacement control of plural cylinders arranged in...
Parallel cylinders
91505, F01B 300, F01B 1304
Patent
active
059271760
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an axial piston machine of skew plate construction, in accordance with the preamble of claim 1.
An axial piston machine of this kind of construction is known from DE-PS 39 15 904. The skew plate is configured as a pivotally mounted cradle, whereby the pistons are supported upon the sliding surface of the cradle. In order to vary the pivot angle of the cradle, an adjustment device is provided which engages on the cradle via a coupling device. Axial piston machines of this kind can be employed both as axial piston pumps and also as axial piston motors.
DE-PS 39 15 904 describes the adjustment of the cradle via a piston acted upon hydraulically and effecting a translational movement. The piston is coupled with the cradle via a sliding element, which is displaced by the piston in the direction of the piston stroke. Thereby, the sliding element is pivotally connected with the cradle by means of a bearing pin and engages into a groove formed in the piston. However, there are applications in which the pivoting of the cradle by means of a rotary movement is more advantageous. The coupling of the cradle to an adjustment device effecting a rotational adjustment movement requires, however, a different configuration of the coupling device.
The object of the invention is to provide a coupling device which makes possible both coupling to a translational adjustment movement and also to a rotational adjustment movement.
The object is achieved by means of the characterising features of claim 1 in combination with the features of the preamble.
The invention is based upon the insight that by means of a corresponding constructional configuration of the coupling device, by means of a bolt element offset eccentrically in relation to the pivot axis, both coupling to a sliding element for bringing about a translational adjustment movement and also a coupling to an eccentric element for bringing about a rotational adjustment movement is possible.
Claims 2 to 10 relate to advantageous developments of the invention.
Corresponding to claims 2 and 3, the bolt element may preferably be formed with cylindrical shape and be pivotally fixed at its outer diameter in a corresponding bore of the sliding element.
Further, the bolt element may preferably have a groove, in accordance with claim 4, into which the eccentric element can engage. In accordance with claim 5, the eccentric element may be formed in a particularly simple manner as a pin extending perpendicularly of the axis of rotation of the rotary shaft.
In accordance with claim 6, for the mounting of the cradle, as is in principle known from DE-PS 39 15 904 or DE-AS 25 21 312, there may be provided roller bearing elements guided in a cage. In order to avoid a displacement of the cage and the roller bearing elements guided therein, there must be provided a follow-up device. Corresponding to claims 7 to 10, the follow-up device can have a guide element which is mounted in the region of the bolt element. For this purpose, the bolt element may have a corresponding recess which, corresponding to claim 8, preferably undercuts the outer diameter of the bolt and thus makes possible a free pivoting movement of the guide element within the provided pivot angle range of the cradle.
Preferred exemplary embodiments of the invention will be described below in more detail with reference to the drawings, which show:
FIG. 1A a section through an exemplary embodiment of the invention having transverse adjustment,
FIG. 1B a section along the line A--A in FIG. 1A, with the cradle in neutral position,
FIG. 1C a section along the line A--A in FIG. 1A, with pivoted cradle,
FIG. 2A a section through an exemplary embodiment of the invention having rotary adjustment,
FIG. 2B a section along the line A--A in FIG. 2A, with the cradle in neutral position,
FIG. 2C a section along the line A--A in FIG. 2A, with pivoted cradle,
FIG. 3 a perspective illustration of the cradle with a coupling device in accordance with the invention,
FIG. 4 an axial section through an axial piston machine with
REFERENCES:
patent: 3739691 (1973-06-01), Bobier
patent: 3806280 (1974-04-01), Bobier
patent: 3967541 (1976-07-01), Born et al.
patent: 4269574 (1981-05-01), Bobier
patent: 5456068 (1995-10-01), Ishii et al.
Hydromatik GmbH
Ryznic John E.
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