Patent ID: 8172560
Filing Date: 2012-05-08
Classification: F04C

Abstract:
1. A fluid machinery comprising: a rotary mechanism including a first cooperating member and a second cooperating member, each of the first and second cooperating members including an engaging member extending from a front surface of an end plate, with the first and second cooperating members being arranged to oscillate in parallel relative to each in order to change volumes of operation chambers formed between the first and second cooperating members; an annular back pressure chamber provided at a back surface side of the end plate of the first cooperating member, the annular back pressure chamber being arranged to communicate with an intermediate operation chamber of the operation chambers to thrust the first cooperation member against the second cooperating member, with the intermediate operation chamber being in an intermediate pressure state; an oil passage arranged to communicate an oil into the back pressure chamber to fill the back pressure chamber with the oil; and a high pressure chamber formed on the back surface side of the end plate of the first cooperating member, the high pressure chamber being disposed between the back pressure chamber and a drive shaft connected to the first cooperating member, the high pressure chamber being provided with high pressure oil and maintained in a high pressure state, the high pressure chamber being separate from the back pressure chamber, the oil passage communicating between the back pressure chamber and the high pressure chamber.