Patent ID: 6086164
Filing Date: 2000-07-11
Classification: B60T,Y10S

Abstract:
A magnet valve (10) with pressure limitation for slip-controlled motor vehicle brake systems, comprising a valve dome (14);a magnet armature (22) is received longitudinally movably in said valve dome (14);the valve dome (14) is circumferentially engaged by a magnet coil (18);a valve tappet (23) is movable with the magnet armature (22);a seat valve (35) is provided, which has a valve seat (43) in a valve body (34), the valve seat surrounding a valve opening (42), and a closing member (51) cooperates with said valve body;the seat valve (35) has a spherical-conical configuration, with the valve seat (43) embodied conically and the closing member (51) is embodied spherically on a face end of an inner part (26);the closing member (51) is disposed on the inner part (26) of the valve tappet (23), which in turn is formed of two coaxially intermeshing outer and inner parts (25, 26);the valve tappet (23) is movable axially by magnetic force into the closing position and by the force of a restoring spring (36) into the open position of the seat valve (35);a pressure limiting spring (28) is disposed between the inner part (26) and the outer part (25) of the valve tappet (23), braced axially against the valve tappet, and counter to the force of this spring the inner valve tappet part (26) is axially displaceable relative to the outer valve tappet part (25) out of the closing position into a partly open position of the seat valve (35);the valve seat (43) is located in an at least approximately straight, circular indentation (44) of the valve body (34), which toward the tappet is defined with a sharp edge (45) by an at least approximately radially extending face end (46) of the valve body;the closing member (51), downstream of a face-end spherical segment (54), changes over, forming a sharp edge (53), into a straight circular-cylindrical portion (52) of the inner valve tappet part (26);the portion (52) of the inner valve tappet part (26) is circumferentially engaged by a tubular portion (57) of the outer valve tappet part (25), forming a gap space (59) with both radial spacing and an axial offset relative to the spherical segment (54);the axial offset of the tubular portion (57) is dimensioned such that a tangent (60), placed in the peripheral region of the spherical segment (54) and intersecting the longitudinal axis (37) of the valve, meets the face end (61) of the tubular portion (57) or runs past this portion on the outside on the face end;in the open position of the seat valve (35), this spherical segment (54) of the closing member (51) is located at least approximately in the region of the valve body face end (46), so that the tangent (60) runs past the face-end edge (45) of the indentation (44) of the valve body (34);in the partly open position of the seat valve (35), in which the closing member (51) is lifted from the valve seat (43) counter to the force of the pressure limiting spring (28), the tangent (60) meets the jacket wall (62) of the indentation (44);from the gap space (59), a pressure fluid conduit (65) leads outward to a control chamber (68), which is located between the face end (69) of the magnet armature (22) remote from the seat valve and the valve dome (14);the control chamber (68) is sealed off circumferentially of the magnet armature (22).