PURPOSE: To provide a variable capacity mechanism which is high-efficient and of a type in that a cylinder block is rotated, by a method wherein an on-off plate is provided for serving to escape fluid in a working fluid chamber under a compression stroke to a low pressure chamber, a control chamber for the on-off plate and a passage switching valve are situated to a side cover.
CONSTITUTION: With a rotary shaft 7 rotated with the aid of an internal combustion engine, a piston support 13 is rotated in synchronism with rotation of the rotary shaft. The piston support 13 and a cylinder block 17 are rotated in synchronism with each other, and along with said synchronism rotation, a through-hole 16 is closed by means of an on-off plate 21 and a cylinder head 20. In this case, in case a high volume is provided, a high pressure introduction passage 42 is opened by energizing an electromagnetic valve 44 of a passage switching valve 40 mounted in a side cover 3. In which case, since a control chamber 19 is full of high pressure fluid incoming through a pore 41, the on-off plate 21 is pressed by means of the cylinder block 17 to provide a high volume. Meanwhile, in case a volume is decreased, by disconnecting energization to the electromagnetic valve 44, a pressure in the control chamber 19 is decreased to a value equal to that in a low pressure chamber 27.
KANAMARU NAONOBU
SASAYA KAZUYUKI
HITACHI AUTOMOTIVE ENG
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