Patent ID: 8215937

Claim:
A fluid machine comprising: a housing, a drive shaft and a driven shaft that are aligned so as to be parallel to each other in the housing, wherein the housing supports the drive shaft and the driven shaft with a plurality of bearings, a drive gear provided on the drive shaft, a driven gear provided on the driven shaft, wherein the drive gear is meshed with the driven gear, and rotation of the drive shaft is transmitted from the drive gear to the driven gear so that the driven shaft is rotated synchronously with the drive shaft, a drive rotor that is provided on the drive shaft, and a driven rotor provided on the driven shaft, wherein the drive rotor and the driven rotor are engaged to each other so as to be rotatable according to the rotation transmission from the drive shaft to the driven gear, wherein the plurality of bearings are attached to the housing, and the drive rotor is rotated by rotation of the drive shaft, the driven rotor is rotated by rotation of the driven shaft, and the machine transports fluid through rotation of the drive and driven rotors, wherein the housing has a two-piece structure having a lower housing member and an upper housing member that is joined to the lower housing member, wherein the lower housing member has a lower bearing support portion that is open upward, wherein the upper housing member has an upper bearing support portion that makes a pair with the lower bearing support portion, and the upper bearing support portion is open downward, wherein the lower bearing support portion and the upper bearing support portion support the plurality of bearings, wherein an uppermost portion of the lower bearing support portion is positioned above a center of each of the plurality of bearings, and an opening width of the lower bearing support portion for each of the plurality of bearings is smaller than the diameter of each of the plurality of bearings.