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Motor driven compressorRelated Patent Categories: Pumps, Three Or More Cylinders Arranged In Parallel, Radial, Or Conical Relationship With Rotary Transmission AxisMotor driven compressor description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060239833, Motor driven compressor. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] The present invention relates to a motor driven compressor, more particularly, which can use refrigerant sucked into a swash plate chamber of the compressor to efficiently cool an electric motor. BACKGROUND ART [0002] In a swash plate type compressor generally used as a compressor of a vehicle air conditioning system, a swash plate in the form of a disk is installed at an inclination angle in a drive shaft for selectively receiving engine power through the engagement/disengagement of an electric clutch or directly receiving power from an electric motor to be rotated by the drive shaft and a plurality of pistons installed around the swash plate with shoes interposed therebetween to linearly reciprocate within a plurality of bores formed in a cylinder block in cooperation with this rotation so that refrigerant is sucked in from an evaporator, compressed, and discharged toward a condenser. [0003] There are various types of compressors that are generally divided into reciprocal and rotary types, in which the reciprocal compressors are divided into crank type, swash plate type and wobble plate type compressors, and the rotary compressors are divided into vane rotary and scroll type compressors. Some of the compressors are called variable capacity compressors since they can vary volume. [0004] Further, there are motor driven compressors which are driven by electric motors as power source, and divided into scroll type and swash plate type motor driven compressors. [0005] In the meantime, the swash plate type compressors are divided into a single head swash plate type compressor if compression is performed at one side by pistons and a double head swash plate type compressor if compression is performed at both sides by pistons. [0006] A motor driven compressor using an electric motor as a power source includes a motor unit having a motor and a compressor unit for compressing refrigerant. The motor unit is heated since the electric motor installed therein is rotated at high speed, and this heat generation also functions as a factor of degrading the entire performance of the motor driven compressor. Accordingly, the motor driven compressor has an important requirement to cool the motor unit. [0007] A number of techniques have been developed already as means for cooling the motor unit of the motor driven compressor. [0008] Japanese Patent Publication No. 1997-32729 discloses a scroll type compressor in which suction refrigerant is flown through a motor room to cool a motor before being compressed in a compressor unit. However, according to this cooling scheme, sucked refrigerant is introduced into the compressor unit via a motor unit to raise the temperature and pressure of refrigerant in a low pressure section, thereby causing problems of the performance degradation of the compressor such as compression efficiency degradation. [0009] According to a scheme applied to the swash plate type compressor using single head pistons, sucked refrigerant is introduced to the motor unit to cool the same and then re-compressed via a low pressure section of the compressor. This scheme may be also performed based upon multiple stage cooling, by which refrigerant compressed in a first piston is introduced to a motor unit to cool the same and then re-compressed by a second piston before being discharged. This scheme is disclosed in Japanese Patent Publication No. 2001-200785. However, this cooling scheme has problems in that refrigerant is introduced into the motor room through a channel isolated from a swash plate chamber failing to sufficiently lubricate the swash plate chamber and compression is performed only at one side making pressure pulsation characteristics poor compared to double head swash plate type compressor. Furthermore, it is required to have a large inclination angle of the swash plate so that load a high speed rotation lowers durability. DISCLOSURE OF THE INVENTION [0010] The present invention has been made to solve the foregoing problems and it is therefore an object of the present invention to provide a motor driven compressor which is so constituted that refrigerant is fed from a swash plate chamber partially into a suction chamber of a front housing via a motor room and partially into a suction chamber of a rear housing in order to improve the cooling efficiency of an electric motor and the entire performance of the compressor while efficiently lubricating sliding components of the swash plate chamber thereby improving durability. [0011] According to an aspect of the invention for realizing the above objects, there is provided a motor driven compressor comprising: a motor unit having an electric motor installed in an inside motor room for rotating a drive shaft; and a compressor unit installed at one side of the motor unit, wherein the compressor unit comprises: a front housing having at least a discharge chamber therein; a rear housing having a suction chamber and a discharge chamber formed therein, the suction chamber being partitioned from the discharge chamber and a refrigerant discharge port formed at one side communicating with the discharge chamber; a cylinder block coupled between the front housing and the rear housing and having a plurality bores formed at both sides of the swash plate chamber and a refrigerant suction formed at one side thereof; a swash plate placed in the swash plate chamber and coupled with the drive shaft and a plurality of double head pistons for reciprocating within the bores in cooperation with the rotation of the swash plate; and feeding means for feeding refrigerant from the swash plate chamber partially into the motor room and partially into the suction chamber of the rear housing. BRIEF DESCRIPTION OF THE DRAWINGS [0012] FIG. 1 is a sectional view illustrating a motor driven compressor according to a first embodiment of the invention; [0013] FIG. 2 is a perspective view illustrating a cylinder block in FIG. 1; [0014] FIG. 3 is a sectional view taken along a line A-A in FIG. 1; [0015] FIG. 4 is a sectional view taken along a line B-B in FIG. 1; [0016] FIG. 5 is a sectional view illustrating a motor driven compressor according to a second embodiment of the invention; [0017] FIG. 6 is a sectional view taken along a line C-C in FIG. 5; [0018] FIG. 7 is a sectional view taken along a line D-D in FIG. 5; [0019] FIG. 8 is a sectional view illustrating the motor drive compressor according to the second embodiment of the invention with an inlet passage modified in position; [0020] FIG. 9 is a sectional view illustrating a motor driven compressor according to a third embodiment of the invention; Continue reading about Motor driven compressor... 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