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A valve unit (1.1, 1.2, 1.3) for modulating pressure in a compressed air braking system has an inlet valve (6) configured as a diaphragm valve, an outlet valve (7) configured as a diaphragm valve, and respective precontrol valves (8, 9), which are each configured as a 3/2-way solenoid valve and are

A valve unit (1.1, 1.2, 1.3) for modulating pressure in a compressed air braking system has an inlet valve (6) configured as a diaphragm valve, an outlet valve (7) configured as a diaphragm valve, and respective precontrol valves (8, 9), which are each configured as a 3/2-way solenoid valve and are arranged in an elongate valve housing (2), which is divided by a division plane (10) that is largely horizontal in the installation position into a base housing (11) and a housing cover (12). The precontrol valves (8, 9) are arranged in the housing cover (12) in the longitudinal direction (13), and the housing cover (12) has a centrally arranged magnet module (20) and two air guide modules (23, 24) adjacent to the magnet module (20) in the longitudinal direction (13) and connected via a single connecting element (45) both to each other and to the base housing (11).

대표청구항 ▼

1. A valve unit (1.1, 1.2, 1.3) for modulating pressure in a compressed air braking system, the valve unit comprising a brake pressure input (3),a brake pressure output (4), anda purge output (5),an inlet valve (6) configured as a diaphragm valve,an outlet valve (7) configured as a diaphragm valve,f

1. A valve unit (1.1, 1.2, 1.3) for modulating pressure in a compressed air braking system, the valve unit comprising a brake pressure input (3),a brake pressure output (4), anda purge output (5),an inlet valve (6) configured as a diaphragm valve,an outlet valve (7) configured as a diaphragm valve,for each of the diaphragm valves (6, 7), a respective precontrol valve (8, 9), each of which is configured as a 3/2-way solenoid valve,an elongate valve housing (2), which is divided by a division plane (10), which extend in a horizontal direction in an installation position, into a base housing (11) and a housing cover (12), wherein the brake pressure input (3) and the brake pressure output (4) and the purge output (5) are arranged in the base housing (11), the diaphragm valves (6, 7) are arranged behind each other in a longitudinal direction (13) in the base housing (11) between the brake pressure input (3) and the brake pressure output (4), with parallel actuation axes (14, 15) and with diaphragms (16, 17) arranged in a common diaphragm plane parallel to and proximate to the division plane (10), and clamped between the base housing (11) and the housing cover (12), and the precontrol valves (8, 9) are arranged in the housing cover (12),wherein the precontrol valve (8) of the inlet valve (6) and the precontrol valve (9) of the outlet valve (7) are arranged in the housing cover (12) with actuation axes in the longitudinal direction (13), with an orientation of their actuation axes (18, 19) parallel to the division plane (10), above the diaphragms (16, 17) of the inlet valve (6) and the outlet valve (7), andwherein the housing cover (12) consists of a centrally arranged magnet module (20) containing magnetic coils (21, 22) of the precontrol valves (8, 9) and of two air guide modules (23, 24) arranged each at an end adjacent to the magnet module (20) in the longitudinal direction (13), each of the air guide modules comprising valve bores (25, 26, 27, 28) and control channels (29, 30, 31, 32, 33, 34) of the precontrol valves (8, 9), and each of the air guide modules having a control chamber upper part (35, 36) of the inlet valve (6) or the outlet valve (7), and being connected via a single connecting element (45) both to the other one of the two air guide modules and to the base housing (11). 2. The valve unit as claimed in claim 1, wherein the connecting element (45) is a flat fixing plate (46) which, parallel to the division plane (10) of the valve housing (2), engages in corresponding recesses (47, 48) of at least one of the air guide modules (23, 24) each arranged between the valve bores (25, 26, 27, 28) and an associated control chamber upper part (35, 36), andwhich, with unilaterally open transverse slots (49, 50, 51, 52), surrounds respectively at least one transverse web (53, 54, 55, 56) of the at least one of the air guide modules (23, 24) running at right angles to the division plane (10) and to the longitudinal direction (13) of the valve housing (2), andwhich comprises bores (57) for bolting the housing cover (12) to the base housing (11). 3. The valve unit as claimed in claim 2, wherein the control channels (29, 30, 31, 32, 33, 34) of the precontrol valves (8, 9) are arranged in transverse webs (53, 54, 55, 56) of the air guide module (23, 24). 4. The valve unit as claimed in claim 1, wherein the precontrol valves (8, 9) are configured as separate solenoid valves with opposite switching directions, each of the precontrol valves having a valve seat (59, 60) facing a respective one of the diaphragms (16, 17) of the inlet valve and the outlet valve (6, 7), the precontrol valves (8, 9) being arranged axially parallel and radially adjacent to each other in the magnet module (20) and in the air guide modules (23, 24). 5. The valve unit as claimed in claim 4, wherein each of the two valve seats (59, 60) is integrally connected to a respective assigned one of the air guide modules (23, 24). 6. The valve unit as claimed in claim 4, wherein mechanical components (39, 40, 41, 42, 43, 44, 59, 59′, 60, 60′) of the solenoid valves (8, 9) are combined in a respective valve cartridge (68, 69). 7. The valve unit as claimed in claim 1, wherein the precontrol valves (8′, 9′) are combined in a double-rotor solenoid valve (83) with a common magnetic coil (84), in which the precontrol valves (8′, 9′) have opposite switching directions, each of the precontrol valves having a valve seat (85, 86) facing a respective one of the diaphragms (16, 17) of the inlet valve (6) and the outlet valve (7), the precontrol valves (8, 9) being arranged coaxially and axially adjacent to each other in the magnet module (20′) and in the air guide modules (23′, 24′). 8. The valve unit as claimed in claim 7, wherein the magnetic coil (84) of the double-rotor solenoid valve (83) is configured to be powered with a low current and a high current, and wherein the precontrol valves (8′, 9′) are configured such that the precontrol valve (8′) assigned to the inlet valve (6) is switched by powering the magnetic coil (84) with the low current, whereas the solenoid valve (9′) assigned to the outlet valve (7) is only switched by powering the magnetic coil (84) with the high current. 9. The valve unit as claimed in claim 7, wherein the magnetic coil (84) of the double-rotor solenoid valve (83) has a central take-off for partial powering, and wherein the precontrol valves (8′, 9′) are configured such that the solenoid valve (8′) assigned to the inlet valve (6) is switched by a partial powering of the magnetic coil (84), whereas the solenoid valve (9′) assigned to the outlet valve (7) is only switched by a full powering of the magnetic coil (84). 10. The valve unit as claimed in claim 7, wherein mechanical components (90, 91, 92, 93, 94, 95, 96) of the double-rotor solenoid valve (83) are combined in a valve cartridge (97), wherein the mechanical components (90, 91, 92, 93, 94, 95, 96) of at least one of the precontrol valves (8′, 9′) have an outer diameter which does not increase in the direction toward the valve seat (85, 86). 11. The valve unit as claimed in claim 1, wherein the magnet module (20″) and one of the air guide modules (24″) are configured integrally, wherein at least one of the precontrol valves (9″) has a valve seat (60″) arranged in one of the valve bores (27″) of a respective one of the air guide modules (24″) and includes mechanical components (42″, 43″, 44″) having an outer diameter that does not increase toward the valve seat (60″). 12. The valve unit as claimed in claim 11, wherein the at least one of the precontrol valves (9″) has an internal valve spring (44″) which is arranged between a respective valve rotor (43″) and an assigned valve core (42″). 13. The valve unit as claimed in claim 1, wherein connecting cables (108) of the magnetic coils (21, 22) are routed within the magnet module (20) and terminate in contacts (109) of a connecting bush (110) formed on the magnet module (20). 14. The valve unit as claimed in claim 1, wherein connecting cables (111) of the magnetic coils (21, 22) are routed within the magnet module (20) and are connected via plug connections (112) to connecting cables (113) which are arranged in at least one of the air guide modules (23) and which terminate in contacts (114) of a connecting bush (115) formed on the magnet module (20). 15. The valve unit as claimed in claim 1, wherein connecting cables (116) of the magnetic coils (21, 22) are routed within the magnet module (20) and terminate in contacts (117) which protrude at an end face from the magnet module (20) and which extend through openings (118) into a connecting bush (119) formed on at least one of the air guide modules (23).