Patent ID: 9297378
Filing Date: 2016-03-29
CPC Classification: B60T,F04C

Claim Text:
1. A pump driving apparatus comprising: a motor; a rotary shaft connected to the motor; a first pump driving part of a first pump, the first pump driving part arranged on the rotary shaft; a second pump driving part of a second pump, the second pump driving part arranged on the rotary shaft; the first and second pump driving parts being spaced in an axial direction relative to one another and having different rotation phases; a first bearing and a second bearing, the first and second bearings rotatably supporting the rotary shaft; a cylinder member having a pair of opposed end faces in sealing contact with the first pump and the second pump, respectively; suction ports provided in the cylinder member in communication with void portions at discharge sides of the first pump and the second pump; wherein the rotary shaft is rotated at a state where the rotary shaft is supported by the first bearing and the second bearing to drive driving targets via the first pump driving part and the second pump driving part; wherein the first bearing, the first pump driving part, the second bearing and the second pump driving part are arranged along the rotary shaft in that order from a first side of the rotary shaft connected to the motor to a second side of the rotary shaft; wherein a discharge amount of the first pump is larger than a discharge amount of the second pump; wherein the first and second pumps are rotary pumps; wherein a seal member is arranged between the first and second pump driving parts in contact with the rotary shaft, the seal member providing a seal between the first and second rotary pumps; and wherein the seal member and the second bearing are arranged in a space between the cylinder member and the rotary shaft.