Title:
GEAR PUMP OR MOTOR
Document Type and Number:
WIPO Patent Application WO/2014/141377
Kind Code:
A1
Abstract:
Provided is a hydraulic pump or motor equipped with an external gear pair composed of a drive-side helical gear and driven-side helical gear in meshed engagement with one another, a casing having at the interior a gear-housing chamber for housing the external gear pair and also having a bearing for housing a drive shaft and a driven shaft, a hydraulic mechanism which has a hydraulic chamber and with which the drive shaft and the driven shaft are pressed in an anti-thrust direction by hydraulic pressure introduced to the hydraulic chamber, and a high-pressure operating liquid introduction path for guiding an operating liquid from a high-pressure side to the hydraulic chamber of the hydraulic mechanism; the bearing is provided with a bushing for receiving the action in the radial direction of the drive shaft or driven shaft. The present invention employs a configuration wherein the hydraulic mechanism is provided with the hydraulic chamber which faces the drive shaft or the driven shaft and is located on the side opposite to the drive-side helical gear or the driven-side helical gear, and a hydraulic receiving section that is disposed inside the hydraulic chamber and that is integrated with the drive shaft or driven shaft and is pressed in the anti-thrust direction by the operating liquid pressure, and wherein the hydraulic receiving section forms a gap that extends along a thrust direction between itself and an inner wall of the hydraulic chamber, and the hydraulic receiving section has an annular recess formed in the vertical direction of the shafts and a sealing member housed in the interior of the annular recess.
Inventors:
HAGINO YUKI (JP)
Application Number:
PCT/JP2013/056730
Publication Date:
September 18, 2014
Filing Date:
March 12, 2013
Export Citation:
Assignee:
SHIMADZU CORP (JP)
International Classes:
F04C2/18; F04C15/00
Foreign References:
| EP1291526A2 | 2003-03-12 | |||
| JP2012519798A | 2012-08-30 | |||
| JPH10231786A | 1998-09-02 | |||
| JPS542407Y1 | 1979-02-01 | |||
| US2974605A | 1961-03-14 |
Attorney, Agent or Firm:
AKAZAWA, Kazuhiro (JP)
Kazuhiro Akazawa (JP)
Kazuhiro Akazawa (JP)
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