Rotary machine and pump driving apparatus

Patent metadata

Field	Value
Publication number	US-9297378-B2
Application number	US-201213659346-A
Country	US
Kind code	B2
Filing date	Oct 24, 2012
Priority date	Oct 24, 2011
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

A rotary machine includes a rotary shaft having two driving reactive force receiving parts that are displaced in an axial direction and are applied with diametrical reactive forces having different rotation phases from driving targets as normal loads; and bearings that rotatably support the rotary shaft wherein the rotary shaft is rotated at a state where the rotary shaft is supported by the bearings to drive the driving targets via the driving reactive force receiving parts, wherein the bearings are respectively provided at both axial sides of one of the two driving reactive force receiving parts, which receives a higher normal load, and wherein a leading end side of the rotary shaft more than the other of the two driving reactive force receiving part, which receive a lower normal load lower than the higher normal load, is configured as a free end.

First claim

What is claimed is:

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.

2. The pump driving apparatus according to claim 1 ,
wherein the second bearing is closer to the second pump than the seal member is to the second pump.

3. The pump driving apparatus according to claim 1 , wherein a thickness of the first pump in an axial direction of the rotary shaft is greater than a thickness of the second pump in the axial direction of the rotary shaft.

4. The pump driving apparatus according to claim 1 , wherein the second bearing is in axial contact with the seal member.

5. The pump driving apparatus according to claim 1 , wherein the void portion at the discharge side of the first pump is symmetrical to the void portion at the discharge side of the second pump, with respect to the rotary shaft.

6. A pump driving apparatus comprising:
a case;
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;
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 an annular cavity is defined between an outer surface of the shaft and an inner surface of the case;
wherein the second bearing and a first seal member are both disposed in the annular cavity;
wherein the pump driving apparatus further includes a housing;
wherein the case is disposed in the housing; and
wherein a second seal member is disposed between the housing and the case.

Assignees

• Advics Co Ltd
• Denso Corp

Inventors

• Ando Kunihito
• Kato Daishi
• Nakamura Yuki
• Naganuma Takahiro
• Kawabata Tomoaki

Classifications

• B60T8/4031

  Pump units characterised by their construction or mounting (pump units in combination with valve blocks B60T8/36) · CPC title

• F04C11/001

  of similar working principle · CPC title

• F04C15/0038

  Shaft sealings specially adapted for rotary-piston machines or pumps · CPC title

• F04C2/102 Primary

  the two members rotating simultaneously around their respective axes · CPC title

• B60T17/02

  Arrangements of pumps or compressors, or control devices therefor · CPC title