US 6,453,936 B1 · Valve system for the pre-engagement unit of a braking pressure modulator

Abstract

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.

Claims33

Dependent claims

A valve system having at least one solenoid valve for a pre-engagement unit of a braking pressure modulator, comprising:

a) a one-piece housing, in which a square-shaped opening forms a first forked flange and a second forked flange;
b) a first bore in said first forked flange and a second pocket bore in said second forked flange, wherein a central line of said first bore is coaxial with a central line of said second pocket bore;
c) a magnet coil, having an opening in the form of a straight circular cylinder through the magnet coil, said magnet coil being designed so that it can be positioned within said square-shaped opening of said housing;
d) a valve cartridge in the form of a cylinder with circular cross-section, said valve cartridge being configured so that it can be inserted into said housing, from said first bore in the direction of said second pocket bore, wherein said magnet coil positioned in said housing opening can only be displaced in an axial direction;
and
e) at least one pressure medium terminal connected to at least one of said forked flanges.

3 more elements

A valve system, having at least one solenoid valve cartridge and an associated magnet coil, wherein said magnet coil actuates said solenoid valve, and wherein said solenoid valve cartridge comprises:

a) three individual cylindrical bodies, designated as first, second and third cylinder bodies in a predetermined assembly direction, connected in series along their respective longitudinal axes, wherein said three cylinder bodies are configured as circular round cylinders;
b) said three cylinder bodies, each having a first end and a second end in said assembly direction, are connected end-to-end so that their respective cylinder diameters decrease in said assembly direction;
c) said second end of said first cylinder body is connected to said first end of said second cylinder body, and said second end of said second cylinder body is connected to said first end of said third cylinder body in such manner that said three cylinder bodies become an integral unit;
d) said first and second cylinder bodies are comprised of a non-magnetic material;
e) said third cylinder body comprises a ferromagnetic material;
f) said second cylinder body is hollow, and contains an armature and an armature return device, wherein said armature presses against said second end of said first cylinder body when there is no current flowing in said magnet coil, and when there is current flowing in said magnet coil, the resultant magnetic field causes said armature to press against said first end of said third cylinder body;
g) said second end of said first cylinder body representing a first valve lift stop of said armature, and said first end of said third cylinder body representing a second valve lift stop.

4 more elements

Dependencies are inferred from the claim text.

Valve system for the pre-engagement unit of a braking pressure modulator

Life of this patent

Valve system for the pre-engagement unit of a braking pressure modulator

Life of this patent

Abstract

Claims33