To select tandem arrangement of connecting first and second hydraulic pumps in series and independent installation of independently installing the first and second hydraulic pumps, while setting hydraulic pressure of both charge oil passages of the first and second hydraulic pumps by a single relief valve.
First and second port blocks are common in a point of having an axial hole for inserting a pump shaft, a pair of hydraulic fluid passages, the charge oil passage having one end part opening on an outer surface and forming a pressure oil receiving port, and a branch oil passage having one end part fluidly connected to the charge oil passage, having the other end part opened on an end surface and forming a connecting port. The connecting port is positioned on a virtual surface along the first plate surface direction and the thickness direction in a state of passing through the axis of the axial hole. Pressure oil is supplied to one pressure oil receiving port, and the other pressure oil supply port is blocked up by a plug. The relief valve for setting the hydraulic pressure of the charge oil passage is installed only in one of the first and second port blocks.
TSUJI TOMOYUKI
JP2001116107A | 2001-04-27 | |||
JP2005054964A | 2005-03-03 | |||
JP2005008063A | 2005-01-13 | |||
JPS5569773A | 1980-05-26 |
大内 信雄
鈴木 活人