Rotary expansible chamber devices – With mechanical sealing
Reexamination Certificate
1999-05-14
2001-01-30
Vrablik, John J. (Department: 3748)
Rotary expansible chamber devices
With mechanical sealing
C418S170000
Reexamination Certificate
active
06179595
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a hydraulic gear machine such as a pump or motor, especially an internal-gear pump, external-gear pump, or similar device.
Hydraulic gear machines of this kind have become known through, e.g., DE-OS 2942417. Pumps of the type described therein are powered through a separate shaft driven by a drive motor. This configuration has the disadvantage that it requires the use of an additional element and takes up more space.
OBJECT OF THE INVENTION
One object of the present invention is to provide a hydraulic gear machine that has a small number of parts and saves as much space as possible.
SUMMARY OF THE INVENTION
In hydraulic gear machines according to the invention, the stated object is attained in that a central bearing tube is provided on which the second gear, e.g., a pinion, is rotatably supported, the bearing tube surrounds a transmission shaft of a vehicular transmission, and the transmission shaft is rotatably supported by a bearing that is radially interposed between the transmission shaft and the bearing tube. The bearing arrangement serves as the radially constraining support for the pump gear on one side and for the transmission shaft on the other.
As a practical design choice, the transmission shaft is the input shaft of the transmission. In a further embodiment, the practical choice may be that the transmission shaft is the output shaft of the transmission. Also, in a further embodiment it may be advantageous if the shaft is an intermediate shaft, such as, e.g., the intermediate shaft. The vehicular transmission may be a gear transmission such as a spur gear system or a planetary gear system. The vehicular transmission may also be a continuously variable transmission such as a cone-pulley transmission.
In this, it is particularly practical if the pinion, or in general a gear with external tooth profile, is driven by the transmission shaft.
It is practical, if one of the gears, such as the pinion, is non-rotatably connected to an annular element that has an internal tooth profile mating with an external tooth profile of the transmission shaft.
As a particularly advantageous feature, a seal such as a packing ring is arranged between the transmission shaft and the bearing tube.
It is further practical if the housing of the gear machine or pump is attached to the transmission housing. In this regard, it is advantageous in one embodiment if the housing of the gear machine is arranged on the inside of the transmission housing. In a further embodiment, it is practical if the housing of the gear machine is arranged on the outside of the transmission housing.
Further, it is particularly practical if a seal is interposed between the shaft and the transmission housing.
It is also advantageous if the bearing, e.g., a slide bearing or particularly a roller bearing, is connected to the source of lubricant for the pump or for the transmission through a lubricant-delivery element. In this regard, it is practical if the delivery of lubricant occurs through a connection such as a bore hole or channel that is formed or extends between a chamber filled with lubricant and the bearing. Likewise, it is practical if the lubricant-delivery element is configured as a channel from the bearing to a chamber containing lubricant.
In accordance with the invention it is particularly practical if the transmission shaft, e.g., the input shaft or output shaft of the transmission, passes axially through the bearing tube and interacts on one side with gear-shifting elements inside the transmission and on the other side has a drive connection, e.g., through a toothed profile.
The novel features that are considered as characteristic of the invention are set forth in particular in the appended claims. The improved apparatus itself, however, both as to its construction and its mode of operation, together with additional features and advantages thereof, will be best understood upon perusal of the following detailed description of certain presently preferred specific embodiments with reference to the accompanying drawing.
REFERENCES:
patent: 5263818 (1993-11-01), Ito et al.
patent: 3410015 (1985-09-01), None
Darby & Darby
LuK Getriebe-Systeme GmbH
Vrablik John J.
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