Rotary pump for braking device

Details Rotary pump for braking device Rotary pump for braking device

2005-10-27

2008-07-15

Denion, Thomas (Department: 3748)

Rotary expansible chamber devices

Moving cylinder

Rotating

C418S075000, C418S076000, C418S132000

Reexamination Certificate

active

07399171

ABSTRACT:
The curvature of a circular arc constituted by a side of a suction groove is made larger than that of a circular arc constituted by a side of a discharge groove. Thus, when the suction groove and the discharge groove are viewed in the axial direction of a drive shaft, the distance between the suction groove and the discharge groove in the radial direction of a rotary portion is short in a region intersecting with a line W perpendicular to a centerline, and increases in accordance with a decrease in distance from containment portions. It is therefore possible to ensure a sufficient distance between the discharge and suction grooves and enhance a total fluid pressure generated therebetween, and the contact surface pressure that is necessitated by a second side plate to obtain a press-back force when being in contact with an outer rotor and an inner rotor is reduced.

REFERENCES:
patent: 3212449 (1965-10-01), Whalen et al.
patent: 3796522 (1974-03-01), Oshima et al.
patent: 6273527 (2001-08-01), Yamaguchi et al.
patent: 6474752 (2002-11-01), Harada et al.
patent: 6715847 (2004-04-01), Yamaguchi et al.
patent: 6749272 (2004-06-01), Uchiyama et al.
patent: 6783193 (2004-08-01), Yamaguchi et al.
patent: 6905321 (2005-06-01), Uchiyama et al.

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