Subaru Legacy/Outback

1999-2003 of release

Repair and car operation

Compressor K/V - a design and a functioning principle

The scheme of functioning of the compressor in a release phase

Principle of functioning of the control valve of the compressor

Principle of functioning magnetic муфты compressor K/V couplings

The general information

On all models the compressor шиберного type is established.

Equipped with five mobile in a radial direction шиберными shovels the compressor rotor rotates in the elliptic cylinder. During rotor rotation there is a reduction of the prisoner between two next шиберными shovels of the working volume, leading to compression of the prisoner in the cylinder of a gaseous coolant. In this case the compressor functions as the pump with 10-fold on one turn of a rotor three-phase (всасывание, compression and pushing out) a running cycle.

From the final party of the cylinder the dosing out roller valve providing выпускание compressed coolant at excess with pressure of compression of some certain value is established. Tightness (by air) landings of a shaft of a rotor in a forward head of compressor assemblage is provided by means of an epiploon. The trigger valve built in the lateral block provides creation противодавления on шиберных rotor shovels.

Assemblage is filled by necessary quantity of the compressor oil distributed between internal components and providing their greasing. Tightness on oil is provided at the expense of digit pressure of a pushed out coolant.

Functioning principle

Всасывание

The gaseous coolant being under low pressure is exhausted from the evaporator at the expense of a rotor of the compressor of depression created at rotation and through the control valve is involved in низконапорную the chamber in a back head of compressor assemblage. Further, at the expense of rotation шиберного a rotor, the coolant through two inlet ports in the back lateral block is soaked up in the working cylinder. Tightness of chambers of the cylinder is (by air provided at the expense of circulation of compressor oil.

Compression

At the further rotation of a rotor formed шиберными the volume клапанной chambers with the prisoner in it a gaseous coolant starts to be compressed by shovels, providing increase of pressure of a working body.

Pushing out

At last (third) stage of a cycle помпажа when pressure of a compressed coolant reaches some stipulated value, the roller valve opens also a coolant on the cylindrical channel provided in the forward lateral block is issued in высоконапорную the chamber of a forward head where by means of a special reflector separates from oil and moves on an exit of compressor assemblage.

The trigger valve

The trigger valve serves for maintenance of demanded level противодавления in closed between шиберными shovels volume for the purpose of maintenance of mobility of the last at compressor start. The valve is equipped by a control ball and a spring, built in the forward lateral block of assemblage and the end is opened in the K-shaped cavity with роторной the parties of the lateral block.

At an insignificant difference between pressure in низконапорной and высоконапорной assemblage parts шиберные shovels have excessively free landing in directing grooves of a rotor. The similar situation is quite typical at small loadings, and also at the initial stage of rotation of the compressor and is fraught with occurrence of vibrations at the expense of infringement of smoothness of a course of dangling shovels. The control ball of the trigger valve propped up by a spring rises over a saddle and provides creation on shovels drawing in противодавления that guarantees smoothness of functioning of assemblage at low loading and at the moment of compressor start.

In normal operating conditions when the difference between pressure in высоконапорной and низконапорной assemblage parts is essential, a control ball, overcoming resistance of a spring nestles on a saddle of the valve and blocks the connecting channel. Thus pressure of oil port through the lateral block is put to a shovel end face, providing it поджим.

The control valve

The control valve consists of a spherical washer and a spring and is established in inlet port of a back head. Directly after a stop of the compressor the difference between pressure in высоконапорной and низконапорной assemblage parts is rather essential that in the absence of the control valve would lead to return rotation of a rotor and coolant pushing out in the evaporator. As soon as the compressor stops, the coolant being under a high pressure wrings out a spherical washer of the valve upwards, blocking thereby inlet port and preventing creation of a stream of a working body from высоконапорной path parts in низконапорную.

Greasing

Lubricant compressor oil accumulates in the bottom part высоконапорной chambers, whence under the pressure of a coolant is pushed out upwards through oil channels in the forward lateral block and provides greasing of a forward end face of a rotor. Besides, the oil part on separate channels in the bottom part of the working cylinder is superseded downwards and moves to a back end face of a rotor. Under the influence of internal pressure in the compressor greasing from both parties a rotor oil arrives in низконапорную the assemblage chamber. Containing in a gaseous coolant leaving the evaporator oil is banished through низконапорную the chamber, providing greasing of the back bearing, and also, on the special channel in a shaft body moves in inlet port of the cylinder, on road greasing the forward bearing and an epiploon. As pressure in inlet port of the cylinder slightly more low, than in низконапорной to the chamber, the oil greasing all components of compressor assemblage, is soaked up in port and with a coolant stream is overtaken back in высоконапорную the chamber.

Magnetic муфта compressor couplings

Magnetic муфта it is fixed on a shaft of a rotor of compressor assemblage and serves for transfer of a twisting moment from the engine to compressor K/V. At current passage through a winding муфты приводная the plate is drawn, consolidating a pulley and a rotor shaft in the uniform module. At the switched off compressor the pulley continues to rotate freely, without setting a rotor in motion.

On equipped 6-tsrovysmi engines l models 3.0 in addition provide the gauge of blocking of the compressor. At a stop of the compressor as a result of refusal the gauge provides отпускание magnetic муфты for the purpose of maintenance of normal functioning resulted by the same, as the compressor with a belt of the steering pump.

System of a delay of activation of the compressor

At receipt on the module of management of a signal about full opening throttle заслонки ECM develops a command on compressor K/V stop (if last at the moment of signal reception has been included). A system problem is maintenance maximum приемистости a vehicle during an acceleration.

Relay K/V is located in the main assembly block of safety locks in the left part of an impellent compartment.

System of stabilisation of turns of idling

Indemnification of increasing loading on the engine at compressor K/V inclusion is carried out at the expense of increase of turns of the single
Course on a signal of special electromagnetic valve IAC.

At reception of the information on inclusion К/В ECM makes activation of the valve of stabilisation of turns of idling (IAC), leading to opening special перепускного the channel on which the part of an air stream moves in the engine bypassing the throttle case.