Adjustable coolant pump

Abstract

The invention is based on the task of developing an adjustable coolant pump driven by the engine, which pump does not require any outside energy for pressure and/or volume stream regulation, guarantees great failure safety, and is supposed to guarantee optimal warm-up of engines having great engine outputs relative to the displacement, which require coolant pumps having a very large design. The adjustable coolant pump according to the invention, having an impeller disposed in torque-proof manner on a pump shaft, having a ring piston spring-loaded by a return spring, axially guided in a pump housing, on which piston a control slide valve disposed in the pump interior is rigidly attached, and which is characterized in that the ring piston and a filter sleeve provided with laser bores, together with other components, form a spring pressure space in the form of a ring cylinder in the interior of the coolant pump, which chamber is connected with a pressure chamber disposed on the pump shaft side, in such a manner that the valve piston of the pilot valve closes off a shaft bore disposed centrally in the pump shaft, which bore opens into the pressure chamber by way of transverse bores disposed in the pump shaft.

1 : Adjustable coolant pump having a pump housing ( 1 ), a pump shaft ( 4 ) mounted in/on the pump housing ( 1 ) in a pump bearing ( 2 ), driven by a drive wheel ( 3 ), an impeller ( 5 ) disposed in torque-proof manner on a free, flow-side end of this pump shaft ( 4 ), having a ring piston ( 7 ) spring-loaded by a return spring ( 6 ), axially guided in the pump housing ( 1 ), on which piston the rear wall ( 8 ) of a control slide valve ( 12 ) disposed in the pump interior ( 9 ) and having an outer cylinder ( 11 ) that variably covers the outflow region ( 10 ) of the impeller ( 5 ) is rigidly attached, wherein a shaft seal ( 14 ) is disposed in a seal accommodation ( 13 ), between the pump shaft ( 4 ) and the pump housing ( 1 ), and furthermore, pump mandrels ( 15 ) by the pump housing ( 1 ) or disposed on the pump housing ( 1 ) are disposed in the pump interior ( 9 ), on which mandrels a wall disk ( 16 ) positioned in a fixed position in the pump interior ( 9 ), between the impeller ( 5 ) and the rear wall ( 8 ) of the control slide valve ( 12 ), is disposed, wherein
 a slide valve guide ( 17 ) for the ring piston ( 7 ) spring-loaded by the return spring ( 6 ) is disposed on the pump housing ( 1 ), which guide guides the ring piston ( 7 ) on the outer mantle and is at a free distance from the pump shaft ( 4 ) with its inner mantle,   wherein the slide valve guide ( 17 ) lies against the wall disk ( 16 ) with its free, flow-side end, so that the components that are adjacent to one another, i.e. the slide valve guide ( 17 ), the wall disk ( 16 ), a sealing disk ( 33 ) disposed on the inner circumference of the disk, spaced apart from the pump shaft ( 4 ) by a throttle gap, radially movable on the wall disk ( 16 ), the pump shaft ( 4 ), and the shaft seal ( 14 ) jointly enclose/form a pressure chamber ( 18 ) in the form of a ring cylinder, and   wherein one/multiple passage bore(s) ( 19 ) is/are disposed in the slide valve guide ( 17 ), at a distance from the wall disk ( 16 ),   wherein, a pilot valve ( 20 ) comprising a setting screw ( 22 ) provided with one/multiple outlet bore(s) ( 21 ), a valve spring ( 23 ), and a valve piston ( 24 ) are disposed in a valve seat bore at the impeller-side free end of the pump shaft ( 4 ), in such a manner that the valve piston ( 24 ) closes off a shaft bore ( 25 ) that is disposed centrally in the pump shaft ( 4 ) and, in the closed, state of the pilot valve ( 20 ), opens into the pressure chamber ( 18 ) by way of one/multiple transverse bore(s) ( 26 ) disposed in the pump shaft,   wherein the return spring ( 6 ), which lies against the ring piston ( 7 ) with one spring end, lies against the spring contact ( 27 ) of a filter sleeve ( 29 ) provided with laser bores ( 28 ) with its other spring end, and presses the sleeve against the wall disk ( 16 ) in this regard, forming a seal,   wherein a filter piston slide valve ( 30 ) is rigidly disposed on the ring piston ( 7 ), which valve slides along the outside circumference of the filter sleeve ( 29 ) when the ring piston ( 7 ) is displaced, and   wherein the ring piston ( 7 ), together with the filter piston slide valve ( 30 ), the filter sleeve ( 29 ), the wall disk ( 16 ), and the slide valve guide ( 17 ) enclose a spring pressure space ( 31 ) in the form of a ring cylinder, and   wherein a control slide valve seal ( 32 ) is disposed on the outside circumference of the wall disk ( 16 ), i.e. toward the outer cylinder ( 11 ), and the sealing disk ( 33 ) is disposed on the inside circumference of the wall disk ( 16 ), and as a result, an impeller rear side space ( 34 ) disposed in the pump interior ( 9 ), between the pump shaft ( 4 ), the rear wall of the impeller ( 5 ), the wall disk ( 16 ), and the outer cylinder ( 11 ) is separated, on the pressure side, from a control slide valve interior ( 36 ) disposed between the rear wall ( 8 ), the filter sleeve ( 29 ), the wall disk ( 16 ), and the outer cylinder ( 11 ), wherein the working pressure that is built up in the spiral channel ( 39 ) is constantly applied in the control slide valve interior ( 36 ), in that mandrel passages ( 35 ) are disposed in the rear wall ( 8 ).   
     
     
         2 : Adjustable coolant pump according to  claim 1 , wherein the pump housing ( 1 ) is flanged onto an engine housing ( 37 ), in which the suction channel ( 38 ) and the spiral channel ( 39 ) are integrated. 
     
     
         3 : Adjustable coolant pump according to  claim 1 , wherein the drive wheel ( 3 ) is a pulley ( 40 ).