Internal gear machine having a filler piece with pivot pins and

Details Internal gear machine having a filler piece with pivot pins and Internal gear machine having a filler piece with pivot pins and

1991-10-18

1993-02-23

Bertsch, Richard A.

Rotary expansible chamber devices

With mechanical sealing

Seal on cylinder engaging rotary member separates inlet and...

418169, 418170, F01C 2102

Patent

active

051885239

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a gear pump or gearmotor with a filler member positioned in a sickle-shaped chamber formed from a pinion gear meshing within an internal gear and the filler piece resting at least partially on the crests of the gear teeth of the pinion and/or internal gear and comprising a substantially sickle-shaped seal having a pivot pin projecting from one side thereof.
To achieve a favorable volumetric efficiency, in the present object the leakage flows of the medium to be conveyed between the high-pressure and low-pressure space are to be kept as small as possible
In this case, for sealing between the high-pressure and low-pressure space, great demands are made, i.a., on the sealing element -- also called filler piece -- which, on the one hand, has to be able to offset in a sealed manner the gap occurring on at least one of the sides facing the teeth and to assume the stresses of the acting forces. In addition, the sealing element is to be marked by advantageous sliding properties on the adjacent parts.
By DE-PS 15 53 027 an internal gear pump has become known, in which the sealing element is movably mounted on both sides by a penetrating bolt in a slide ring each placed in axial plates. In the design it is essential that the resultant of the hydraulic forces acting on the filler piece run through the geometric axis of the filler piece bolt.
Because of DE-PS 29 42 417 an internal gear machine is known, which exhibits a half-sickle-shaped filler piece divided along a partial surface extending approximately in the peripheral direction, whose filler piece parts are supported with support surfaces on a filler piece pin, mounted to rotate around its longitudinal axis, axially going through the space between internal gear and pinion. For this purpose, a plane support surface is provided on the filler piece pin and the filler piece comprises several parts whose assembly requires corresponding care an special attention.
To avoid the filler piece being wedged by friction with the teeth between pinion and internal gear in a pressureless start, especially of an internal gear machine, according to DE-OS 16 53 818, i.a., an additional pin going through the filler piece in the axial direction is used.
These embodiments comprise the common disadvantage according to which by the sealing and holding functions, distributed to many parts, the number of separating lines and friction surfaces increases and thus leads to great stresses.
Thus, the object of the invention is to configure the filler piece of a gear pump or gearmotor of the initially described type so that the sealing between high-pressure and low-pressure space is considerably improved and the assembly of the filler piece is facilitated as well as the operating reliability and less wear--for example, by reduction of the support surfaces--can be established.
According to the invention this object is achieved in that seal and pivot pins are constructed in one piece at least as part of the filler piece.
As a result, the wear resistance and the operating reliability are improved.
A preferred embodiment of the filler piece comprises a one-piece filler piece formed from seal and pivot pins. The incorporation of the filler piece in the laterally adjacent parts of the gear pump or gearmotor can take place in the simplest way.
Placing of the pivot pins on the end of the seal facing the low-pressure space allows an optimal use of the sealing surfaces on the teeth tips by the outsides of the seal being drawn over the entire length of extension of the filler piece in the interspace.
To improve the adaptability of the seal on the teeth tips, the filler piece can be provided with a separating gap, forming an inside and outside leg, extending from the high-pressure area in the peripheral direction. As a result, especially by the increased elasticity of the separated seal a clearly improved sealing action can be produced on the teeth tips.
Since seal and pivot pins together form a filler piece, it is possible, i.a., that the separating gap can be extended at least a

REFERENCES:
patent: 3890066 (1975-06-01), Eckerle
patent: 4778363 (1988-10-01), Buchmuller

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