摘要:
A two-stage solenoid valve for an electropneumatic valve control unit, e.g., a pilot control unit of a pressure modulator, includes a solenoid system to which a first and second current intensity can be applied as well as a solenoid valve device with a primary side connectable to a first compressed-air supply and a secondary side connectable to a second compressed-air supply. A primary valve encompassing an adjustable primary armature biased by a primary armature spring is provided on the primary side, and a secondary valve encompassing an adjustable secondary armature biased by a secondary armature spring is provided on the secondary side. The solenoid valve device can be a valve cartridge insertable from one side. Diameters of a front (in relation to insertion direction) region and a central region of the valve cartridge are smaller than or equal to the diameter of a rear region of the valve cartridge.
摘要:
A valve control unit including three valve units for two brake channels of an electropneumatic brake system is provided. Each valve unit is embodied as a valve modulator device for a braking pressure control circuit including an air inlet valve with a primary solenoid and a bleed valve with a secondary solenoid. Each modulator device armature includes a common solenoid guide arrangement controlled by the magnetic flux of a common magnetic coil. Independent operation of the armatures is achieved whereby flux through the secondary solenoid is weakened by a shunt in the flux circuit which causes a switching delay for the secondary solenoid relative to the primary solenoid. The magnetic resistance of a non-magnetic disc effects switch-off acceleration in the flux circuit with energized secondary solenoid, weakens the field and causes the secondary solenoid to revert to a spring-loaded base state at a higher flux than the primary solenoid.
摘要:
The invention relates to a two-stage solenoid valve for an electropneumatic valve control unit, particularly a pilot control unit of a pressure modulator. Said solenoid valve at least comprises a solenoid system (6) to which a first and second current intensity can be applied as well as a solenoid valve device (8) that is accommodated in the solenoid system (6) and is provided with a primary side (8a) to be connected to a first compressed-air supply and a secondary side (8b) to be connected to a second compressed-air supply. A primary valve (10) encompassing an adjustable primary armature (10a) that is biased by means of a primary armature spring (10c) is provided on the primary side, while a secondary valve (11) encompassing an adjustable secondary armature (11a) which is biased by means of a secondary armature spring (11c) is provided on the secondary side. The solenoid valve device (8) is embodied as a valve cartridge which is to be inserted from one side. Advantageously, the diameters or a forward zone (18a) and a central zone (18c) of the valve cartridge (8) are smaller than or identical to the diameter of a rear zone of the valve cartridge, “forward” being in relation to the direction of insertion.
摘要:
The invention relates to a valve control unit, made up of three valve units, preferably as a pilot unit (1) for two brake channels of an electropneumatic brake system, whereby each valve unit is embodied as a valve modulator device (7) for a braking pressure control circuit made up of an air inlet valve (22) with a primary solenoid (22a) and a bleed valve (23) with a secondary solenoid (23a), whereby each armature is provided with a common solenoid guide arrangement (10), controlled by the magnetic flux of a common magnetic coil (11). According to the invention, an independent operation of the armatures may be achieved, whereby, the flux through the secondary solenoid (23a) is weakened by a shunt (20) in the total magnetic flux circuit (3) which causes a switching delay for the secondary solenoid (23a) relative to the primary solenoid (22a) and, furthermore, the magnetic resistance of a non-magnetic disc (25) is effective for switch-off acceleration in the magnetic flux circuit (3) with energized secondary solenoid (23a), and weakens the field and causes the secondary solenoid (23a) to revert the spring-loaded base state thereof at a higher magnetic flux than the primary solenoid (22a).
摘要:
A valve system for the pre-engagement unit of a vehicle braking pressure modulator contains solenoid valves, which are controlled by an electronic braking system. Pneumatic pressure is fed into a brake cylinder on the vehicle wheels via a pressure regulating channel of the pre-engagement unit. The solenoid valves are configured as cartridge solenoid valves, so that assembly is simplified, and utilization of elastic tolerance compensating elements is unnecessary. A preferred embodiment includes three cylinder bodies connected end-to-end with no increase in cylinder diameter. This embodiment enables the use of identical armatures and identical magnet coils for different valve types, such as 3/2-way solenoid valves or 2/2-way solenoid valves. Also, these valves may be configured as normally open or normally closed, with identical outside dimensions. As such, three cartridge solenoid valves can be combined into a compact triple valve cartridge unit that further simplifies the assembly process.
摘要:
A pre-engagement unit for a braking pressure modulator for a pressure regulating circuit includes a first pneumatic inlet, a second pneumatic inlet, a first pneumatic output terminal, and a second pneumatic output terminal. The unit includes an electrically actuated valve system having a plurality of solenoid valves and a plurality of electrical terminals connected to output terminals of an electronic control unit. An electric braking command signal transmitter delivers a driver initiated electric brake value setting to an input of the electronic control unit. Under normal conditions, a supply pressure and a redundancy pressure are delivered at the first pneumatic output terminal to be converted by an air quantity augmenting relay valve to a braking pressure. In case of failure of the electronic braking system, the redundancy pressure is delivered at the first pneumatic output terminal to be converted by the air quantity augmenting relay valve to the braking pressure.
摘要:
A pre-engagement unit for a braking pressure modulator for a pressure regulating circuit of an electronic braking system includes an electrically actuated valve system with three substantially identical 2/2-way solenoid valves. First and second terminals of the 2/2-way solenoid valves are selectively connected to the pneumatic inlets and output terminals of the pre-engagement unit, and to each other so that the first 2/2-way valve serves as an air admission valve for supply pressure, the second 2/2-way solenoid valve serves as an air admission/exhaust valve for redundancy pressure, and the third 2/2-way solenoid valve serves as an exhaust valve. Thereby, the pressure in the pressure regulating circuit can be increased, decreased, or maintained. Desirably, the first, second, and third 2/2-way solenoid valves are connected in parallel to each other.
摘要:
A method for manufacturing magnet armatures which are used mainly in brake-pressure modulators of electronically controlled brake systems and which are provided on their entire surface with a plastic coating, for reasons of dimensional stability and sliding properties. Magnet armatures of this type are constructed as cylindrical members and are usually provided in the region of one of the two end faces with an elastomeric sealing element, which according to the prior art is bonded to the magnet armature by vulcanization, an adhesive elastomer-to-metal bond being formed between the magnet armature and the elastomeric sealing element during vulcanization. Since bonds of this type are not possible for a completely coated magnet armature, the elastomer for the elastomeric sealing element is, according to the invention, vulcanized onto the armature without using an adhesion promoter. The resulting absence of nonpositive bonding between the elastomeric sealing element and the magnet armature is replaced by the structural feature of an interlocking relationship between the magnet armature and the elastomer. The interlocking relationship is achieved by an undercut in the magnet armature.
摘要:
A valve control unit, particularly for a pressure modulator of a commercial vehicle includes a valve control housing, solenoid valves, which are provided with solenoids and internal valve pieces inserted into the solenoids, and a pneumatic interface. The solenoids are accommodated inside the valve control housing. Pressure sensors for measuring pneumatic pressures are accommodated in or on the valve control unit, preferably on the top surface. Valve bores, into which the internal valve pieces are inserted, extend within the valve control housing. Air ducts extend between the pneumatic interface, the valve bores, and the pressure sensors, inside the valve control housing. The solenoids and pressure sensors are contacted with an electrical interface. The valve control housing can be a single piece.
摘要:
The invention relates to a valve control unit, particularly for a pressure modulator of a commercial vehicle. Said valve control unit (1) comprises a valve control housing (2), solenoid valves (4, 5, 6) which are provided with solenoids (16) and internal valve pieces (4a, 5a, 6a) inserted into the solenoids (16), and a pneumatic interface (14). The solenoids (16) are accommodated inside the valve control housing (2). Pressure sensors (10) for measuring pneumatic pressures are accommodated in or on the valve control unit, preferably on the top surface. Valve bores (3), into which the internal valve pieces (4a, 5a, 6a) are inserted, extend within the valve control housing (2). Air ducts (12) extend between the pneumatic interface (14), the valve bores (3), and the pressure sensors (10), inside the valve control housing (2). The solenoids (16) and pressure sensors (10) are contacted with an electrical interface (8). Advantageously, the valve control housing (2) is embodied as a single piece.