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US 4,932,843 AGranted
Variable displacement swash-plate type compressor
AssigneesNippondenso Co., Ltd., Nippon Soken, Inc.
InventorsFumihiro Itoigawa, Mitsuo Inagaki, Shigeki Iwanami, Yoshiki Kurokawa, Akikazu Kojima
Life of this patent
Estimating the term…
Abstract
A variable displacement swash-plate type compressor has a swash plate rockably carried by a shaft, and a spool for changing the angle of tilt of the swash plate and also the position of the center of the swash plate, thereby to vary the displacement of the compressor. The compressor has a control valve which determines a control pressure to be supplied to a control pressure chamber behind the spool, between the level of a low-pressure introduced from a low-pressure side of the compressor and a high-pressure introduced from a high-pressure side of the compressor.
Claims17
A variable displacement swash-plate type compressor comprising:
- a cylinder block having cylinder chambers formed therein;
- a shaft rotatably extending through and rotatably supported by said cylinder block;
- a swash plate rockably connected to said shaft and rotatable together with said shaft;
- pistons slidably received in said cylinder chambers and capable of reciprocally moving in said cylinder chambers in response to rocking motions of said swash plate;
- working chambers defined between both ends of said pistons and adjacent walls of said cylinder chambers and capable of sucking and discharging a fluid into and out therefrom;
- a control pressure chamber;
- controlling means responsive to a pressure in said control pressure chamber to vary the angle of tilt of said swash plate and shift the center of said swash plate along the axis of said shaft such that a top dead point of one end of each piston is substantially constant;
- and
- a control valve for controlling a signal pressure supplied to said control pressure chamber;
- wherein said control valve includes:
- a first pressure introduction passage for a low pressure;
- a second pressure introduction passage for a high pressure;
- a signal pressure passage communicating with said control pressure chamber;
- a control valve member operative to control the pressure to be introduced into said signal pressure passage between a first pressure level related to the low pressure and a second pressure level related to the high pressure;
- a diaphragm capable of deflecting in accordance with a change in a pressure related to the low pressure;
- means for transmitting the deflection of said diaphragm to said control valve member;
- and
- solenoid means operative to vary a deflecting force applied to said diaphragm.
15 more elements
A variable displacement swash-plate type compressor comprising:
- a cylinder block having cylinder chambers formed therein;
- a shaft rotatably extending through and rotatably supported by said cylinder block;
- a swash plate rockably connected to said shaft and rotatable together with said shaft;
- pistons slidably received in said cylinder chambers and capable of reciprocally moving in said cylinder chambers in response to rocking motions of said swash plate;
- working chambers defined between both ends of said pistons and adjacent walls of said cylinder chambers and capable of sucking and discharging a fluid into and out therefrom;
- supporting means disposed coaxially with said shaft and rockably supporting the center of said swash plate;
- a spool for causing said supporting means to move in the axial direction of said shaft;
- a control pressure chamber formed on the side of said spool opposite to said supporting means and capable of urging said spool in accordance with a pressure established therein;
- and
- a control valve for controlling a signal pressure supplied to said control pressure chamber;
- wherein said control valve includes:
- a low-pressure introduction passage communicating with a low-pressure portion of said compressor;
- a high-pressure introduction passage communicating with a high-pressure portion of said compressor;
- a signal pressure passage communicating with said control pressure chamber;
- a control valve member capable of controlling the pressure to be introduced into said signal pressure passage between the level of a low pressure introduced through said lowpressure introduction passage and a high pressure introduced through said high-pressure introduction passage;
- a diaphragm capable of deflecting in accordance with a change in the pressure in a low-pressure side of said compressor;
- connecting means for transmitting the deflection of said diaphragm to said control valve member;
- and solenoid means disposed on the side of said diaphragm opposite to said connecting means and capable of changing, in response to a change in an electromagnetic force, the deflecting force applied to said diaphragm.
15 more elements
Dependencies are inferred from the claim text.