Rotary expansible chamber devices – With mechanical sealing – Axially movable end wall or end wall portion
Patent
1990-03-12
1991-10-01
Smith, Leonard E.
Rotary expansible chamber devices
With mechanical sealing
Axially movable end wall or end wall portion
418 14, F03C 208, F04C 1500
Patent
active
050529056
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a gear motor in which a pressure plate is arranged at at least one side of gear wheels and is pressed into engagement therewith by fluid pressure in two concentric preliminary outer and main inner pressure areas with a control valve controlling pressure in the radially inner main pressure area. In such known gear motor, there is the disadvantage that the pressure medium control between the preliminary pressure area and the main pressure area does not function satisfactorily, so that the pressure build up in the main pressure field is not effected in a perfect manner.
SUMMARY OF THE INVENTION
The object of the invention is to provide a gear motor having the advantage that the control of the preliminary and main pressure fields is not problematic, so that operability of the gear motor is accordingly improved. The object of the invention is achieved by connecting the intermediate space between the seals with the tooth chambers by a throttle bore extending through the pressure plate and with the control valve by a fluid conduit.
The present invention both as to its construction so to its mode of operation, together with additional objects and advantages thereof, will be best understood from the following detailed description of the preferred embodiments when read with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a longitudinal cross-sectional view of a gear through a motor according to the invention;
FIG. 2 shows a cross-sectional view along lines II--II according to FIG. 1;
FIG. 3 shows a basic diagram;
FIG. 4 shows a view similar to that of FIG. 1 of a modified embodiment of a gear motor; and
FIG. 5 shows a basic diagram.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The gear motor comprises a housing 10 whose interior space 11 has the approximate cross-sectional shape of a numeral eight which is closed at both sides by covers 12, 13. Two gears 14, 15 mesh with one another in external engagement in the interior space, their shafts 16, 17 being supported in bearing bodies 18, 19 having a shape of spectacles. Such bearing bodies are known in general and are therefore not described in more detail. A passage 20 is formed in the cover 13, and an extension 23 of the shaft 17 passes outward through the passage 20. The extension 23 is sealed in this location by a sealing ring 24 and forms a power output shaft.
A pressure plate 26 is arranged between the bearing body 18 and the adjacent lateral surfaces of the gears 14, 15, which pressure plate 26 also has the contour of the housing interior and overlaps the entire surface of the gears. Two pressure areas described below, act on a side of the pressure plate 26 which is opposite to a side thereof that abuts the gears 14 and 15.
FIG. 2 shows a front side view of the bearing body 18 facing the pressure plate 26. A first grooved channel 27 is formed in this front side. It extends in the vicinity of the outer contour of the bearing body, partially concentrically to the gear shafts and runs from the high-pressure side HP to the low-pressure side LP, but does not abut the latter. The grooved channel 27 ends in two groove ends 27A, 27B, respectively, which penetrate forward until the edge of the bearing body. A seal 28 of rubber-elastic work material is arranged in this grooved channel.
A second grooved channel 29, which likewise extends from the high-pressure side to the low-pressure side, is likewise formed so as to be concentric to the gear shafts, but radially inside the grooved channel 27, wherein its ends 29A, 29B penetrate further forward to the low-pressure side than the groove ends of the groove train 27. Moreover, the grooved channel 29 comprises, in its central area, a notch 29C which leads approximately to an imaginary straight line connecting the shaft centers. A seal 30, which likewise comprises a rubber-elastic work material, is suitably arranged in the groove channel 29.
The high-pressure side HP is characterized by a recess 31 into which the high-pressure hole
REFERENCES:
patent: 3175468 (1965-03-01), Miller
patent: 3975124 (1976-08-01), Dworak et al.
patent: 4281974 (1981-08-01), Teruyama
patent: 4344745 (1982-08-01), Herrmann
Cavanaugh David L.
Robert & Bosch GmbH
Smith Leonard E.
Striker Michael J.
LandOfFree
Gear motor with valve controlled pressure biased end-plate seal does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Gear motor with valve controlled pressure biased end-plate seal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gear motor with valve controlled pressure biased end-plate seal will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1751399