Rotary expansible chamber devices – With mechanical sealing – Axially movable end wall or end wall portion
Patent
1989-06-26
1990-09-25
Vrablik, John J.
Rotary expansible chamber devices
With mechanical sealing
Axially movable end wall or end wall portion
F04C 218, F04C 1500
Patent
active
049589946
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a gear machine(pump or engine).
A gear machine(pump or engine) is known comprising two gears mounted on shaft journals. The gears mesh and their shaft journals are supported in bushing or eyeglass-shaped bearing members. A sealing plate is located on at least one side of the gears between the lateral surfaces of the gears and the adjacent bearing members. The sealing plate is brought into sealing contact with the lateral surfaces of the gears by an sealing plate and the bearing member and which is limited by a seal arrangement.
In the known gear machine the radial contact pressure at the seal arrangement and the sealing plate may be faulty, i.e., may be insufficient, so that a certain counter-pressure can disadvantageously build up at the seal arrangement and the sealing plate.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a gear machine(pump or engine) of the above-described type, in which the radial contact pressure at the seal arrangement and the sealing plate is satisfactory.
In keeping with this object and with others which will become apparent hereinafter, the gear machine further comprises a circumferentially-extending, relief groove in the outer circumference of the adjacent bearing member. The relief groove is adjacent and spaced from the sealing plate and communicates with the low-pressure side, e.g., by the gap between the housing and the bearing member.
In the gear machine according to our invention the axial pressure field is sealed in a more perfect manner. Specifically the steep pressure differential between the sealing plate and the relief groove causes the sealing element to press radially against the housing in a forceful manner. Accordingly, an increase in the power of the machine is possible along with higher pressures, higher speeds and lower losses.
The seal arrangement advantageously comprises a shaped sealing element of a resilient material having a U-shaped transverse cross section and shaped like a "3". This sealing element can be embedded in a supporting element of a comparatively harder material which contacts on the bearing member.
Also advantageously one of the sealing plates is located on both sides of the gears.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a longitudinal cross sectional view through a gear machine (pump or engine) according to our invention,
FIG. 2 is a detailed cross sectional view of a portion of the apparatus of FIG. 1 indicated by the dot-dashed circle X in FIG. 1,
FIG. 3 is a plan view of a sealing element,
FIG. 4 is a plan view of a supporting element for the sealing element of FIG. 3,
FIG. 5 is a plan view of a bearing member for the gear machine with the seal arrangement shown in FIGS. 3 and 4 taken along the section line V--V of FIG. 1.
DETAILED DESCRIPTION OF THE INVENTION
The gear machine shown in the drawing comprises a housing 10 which is closed on both sides by covers 11 and 12. Two gears 13 and 14 mesh each having two lateral surfaces 13', 13" or 14', 14" on opposite sides at their outer peripheral edges in the housing 10, their shaft journals 15 to 18 being supported in bushing or eyeglass-shaped bearing members 19,20. The shaft journal 16 has a continuation 22 with which it projects through a drilled hole 23 in the cover and drives the gear machine. The shaft seal 24 is located in a widened portion of the drilled hole 23.
A sealing plate 26 or 27 is located between each pair of bearing members 19 or 20 and the lateral surfaces of the gears. A seal arrangement 28,29 is located between every sealing plate and the adjacent bearing members; axially acting pressure fields 30,31 are built up in a known manner by a seal arrangement and bring the sealing plates 26,27 into sealing contact with the lateral surfaces of the gears 13,14. Leakage losses are accordingly reduced to a great extent relative to the current gear machine of this type.
To further improve the sealing action of the pressure fields 30,31 a circularly-extending relief groove 32,33 is formed in
REFERENCES:
patent: 2974605 (1961-03-01), Murray
patent: 3499390 (1970-03-01), Prijatel
patent: 3961872 (1976-06-01), Muller et al.
patent: 4108582 (1978-08-01), Bitton
patent: 4331444 (1982-01-01), Shumate
patent: 4605363 (1986-08-01), Walsh
Griese Klaus
Jons Claus
Muhlbauer Werner
Muller Karl-Heinz
Muller Rudolf
Cavanaugh David L.
Robert & Bosch GmbH
Striker Michael J.
Vrablik John J.
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