Pumps – Condition responsive control of pump drive motor – With condition responsive control of pump fluid valve
Patent
1993-06-08
1995-02-21
Bertsch, Richard A.
Pumps
Condition responsive control of pump drive motor
With condition responsive control of pump fluid valve
91498, 92 58, 92 72, F04B 104
Patent
active
053910591
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a motor or pump assembly comprising a cylinder block with a plurality of radially positioned cylinders, a piston arranged slidably reciprocable in each of the cylinders, a cam ring cooperating with the pistons and being rotatably journalled on the cylinder block, and a distributor valve arranged centrally in the cylinder block to control the flow of fluid to and from the cylinders in operation.
Assemblies of this type operate in the manner that during mutual rotation between the cam ring and the cylinder block the pistons travel to and fro in their cylinders in step with a boss or roller on the piston top running up and down a plurality of wave-shaped cams on the inner side of the cam ring. This special pattern of motion entails that the assembly cannot or has difficulty in operating at greater relative speeds of rotation, and that it must be constructed with corresponding large dimensions to be able to provide the desired power. It therefore frequently presents considerable difficulties to incorporate conventional assemblies of this type in machinery with restricted space, as is e.g. the case in the apparatus described in the applicant's International Patent Application PCT/DK89/00213 for drilling underground bore holes. Owing to the large output moment of the assembly at low speeds of rotation it would otherwise, i.e. apart from its great space requirement, be extremely suitable for direct incorporation as a drive motor in the wheels of the drilling apparatus, as well as in other cases where the special properties of the assembly can be utilized to advantage.
The object of the invention is to provide an assembly of the type stated in the opening paragraph, which, with a stable and reliable structure, has a smaller axial length with respect to the capacity than known before, and is simultaneously simple and inexpensive to manufacture and easy to dismantle and assemble again in connection with service and repair.
The assembly of the invention is novel and unique in the cylinder block and the cam ring are provided with approximately the same width and the cam ring and the distributor valve are connected with a thin carrier plate which just clears the cylinder block. This entails that the entire assembly per se will have the shape of a relatively narrow disc, which is excellently suitable for incorporation as a drive motor in a wheel for e.g. the drilling equipment described in the applicant's above-mentioned PCT application.
The relative direction of rotation between the cylinder block and the cam ring is determined by the angular position of the distributor valve with respect to the cams. It will be desirable in many cases that this direction of rotation can be changed, and this is obtained according to the invention by equipping the structure with two detachable connections between the cam ring and the distributor valve and positioning these connections in positions that correspond to their respective relative directions of rotation.
The invention will be explained more fully by the following description of embodiments, which just serve as examples, with reference to the drawing, in which
FIG. 1 is a radial section through an assembly according to the invention,
FIG. 2 shows a first embodiment of an assembly according to the invention, seen along the line II--II in FIG. 1,
FIG. 3 shows a second embodiment of an assembly according to the invention, seen along the line III--III in FIG. 1,
FIG. 4 is a perspective view of a fragment of a tripartite cam ring associated with the assembly and a piston with a roller running in a groove in the cam ring, and
FIG. 5 is an enlarged end view of a carrier pin with two mutually angularly displaced slots for reversing the relative direction of rotation.
In principle, the assembly of the invention can work with any fluid and serve as either a motor or a pump in response to the circuit of the fluid. The invention is described below on the assumption that the assembly is a motor working with hydraulic oil fed from a source of pressure, e.g. a hydrauli
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Bertsch Richard A.
H T C A/S
Kocharov M.
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