Rotary expansible chamber devices – With mechanical sealing – Axially movable end wall or end wall portion
Reexamination Certificate
2006-12-05
2006-12-05
Trieu, Theresa (Department: 3748)
Rotary expansible chamber devices
With mechanical sealing
Axially movable end wall or end wall portion
C418S133000, C418S206100, C418S206600, C418S206700, C418S206800, C418S180000
Reexamination Certificate
active
07144234
ABSTRACT:
The invention concerns a gear pump comprising a pump body (2) closed with a cover (3) forming a cavity wherein is provided a drive pinion (4) capable of being driven in rotation by a drive shaft (1) whereto it is fixed, a driven pinion (5) whereof the teeth co-operate with the drive pinion (4) teeth so as to be driven in rotation thereby and two end shields (8) arranged on either side of the driven pinion (5) penetrating into a cavity (10) provided therefor in the pump body (2) and the cover (3) respectively, means being provided for exerting pressure on the outer surface of the end shields. In order to prevent the cover from being deformed under the effect of the pressure thereby creating a leakage zone between the delivery zone and the suction zone, the end shields each consist of a disc (8) integral with one end of the driven pinion (5), the discs (8) and the driven pinion (5) being concentric, the discs (8) covering the teeth of the driven pinion (5). The pressure exerted on the outer surface of the discs prevents them from being deformed such that practically no axial leakage zone is formed. Additionally, the discs can serve as guiding axis for the rotation of the driven pinion.
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Pierburg, Sarl
Trieu Theresa
Westerman Hattori Daniels & Adrian LLP
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