Patent ID: 8562307
Filing Date: 2013-10-22
Classification: F04B,F15B

Abstract:
1. A pump equipment comprising: a pair of pump units, each of the pump units including a swash plate type piston pump and a capacity changing mechanism configured to incline a swash plate of the swash plate type piston pump to change a pump capacity; a valve unit sandwiched between the pair of pump units, the valve unit coupled to the pair of pump units; and a pair of electrical regulators, each of the electrical regulators including a mechanism control valve and a solenoid proportional valve and coupled to a respective one of the pair of pump units, each mechanism control valve being configured to control a mechanism driving fluid introduced to the capacity changing mechanism, the solenoid proportional valve being configured to reduce pressure of an input port in accordance with an input electrical signal and introduce the pressure as pilot pressure to a pressure receiving portion of the mechanism control valve, wherein: an inter-pump passage extends between the pair of pump units, the inter-pump passage including a pump passage formed in each of the pair of pump units and a valve passage formed at a valve block of the valve unit; and wherein the inter-pump passage opens at the pair of pump units toward the electrical regulators, and wherein primary ports of the solenoid proportional valves of the pair of pump units communicate with each other through the inter-pump passage.