Valve

Abstract

A valve includes: a housing; a solenoid arranged in the housing, the solenoid comprising a coil, an armature, an upper stator and a lower stator, the armature and the upper and lower stators being configured such that, when a magnetic force acts between the upper and lower stators, the armature moves axially; a pin connected to the armature; a cup-shaped piston connected to the pin; a spring, configured to provide a force that moves the piston away from the solenoid in a case in which no magnetic force acts between the upper and lower stators; and a protective sleeve arranged in the solenoid, the protective sleeve being made of a corrosion-resistant material.

Claims

1-8. (canceled)

9. A valve comprising: a housing; a solenoid arranged in the housing, the solenoid comprising a coil, an armature, an upper stator and a lower stator, the armature and the upper and lower stators being configured such that, when a magnetic force acts between the upper and lower stators, the armature moves axially; a pin connected to the armature; a cup-shaped piston connected to the pin; a spring, configured to provide a force that moves the piston away from the solenoid in a case in which no magnetic force acts between the upper and lower stators; and a protective sleeve (21) arranged in the solenoid (5), the protective sleeve (21) being made of a corrosion-resistant material.

10. The valve as claimed in claim 9, wherein the corrosion-resistant material is high-grade steel.

11. The valve as claimed in claim 10, wherein the high-grade steel is a chromium-nickel steel.

12. The valve as claimed in claim 9, wherein the protective sleeve (21) has a wall thickness of 0.1 mm to 0.5 mm, or 0.2 mm to 0.4 mm, or 0.25 mm.

13. The valve as claimed in claim 9, wherein the protective sleeve (21) is arranged in the solenoid (5) between the armature (20) and the upper and lower stator (16, 17).

14. The valve as claimed in claim 13, wherein the protective sleeve (21) arranged in an aperture (19) in the upper stator (16), so as to form a radial air gap between the lower stator (17) and the protective sleeve (21).

15. The valve as claimed in claim 13, wherein the protective sleeve (21) has a flange (23), configured to rest against the lower stator (17).

16. The valve as claimed in claim 15, wherein the protective sleeve (21) is encased by the housing (1), at least in a partial region of the flange (23).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The invention will be described in more detail on the basis of an exemplary embodiment. In the figures:

[0015] FIG. 1 shows a sectional illustration of a valve according to the prior art; and

[0016] FIG. 2 shows an enlarged sectional illustration of the valve according to the invention in the region of the solenoid.

DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENTS

[0017] FIG. 1 shows the valve, which comprises a housing 1. The housing 1 furthermore has an integrally formed flange 3, via which the housing 1 is flanged-mounted on a turbocharger (not illustrated) in the region of a bypass line. The electrical contacting of a solenoid 5, which is arranged in the housing 1, is accomplished via a socket 2. The solenoid 5 has a coil 6, which acts on a metal pin 7. The metal pin 7 is connected to a cup-shaped piston 8, which, at the periphery of its base 9, has a sealing surface 10 that interacts with a valve seat (not illustrated). Here, a spring 7b pushes the piston 8 in the direction of the valve seat. The housing 1 furthermore has a cylindrical section 11 which extends in the direction of the piston 8. A cylinder bushing 12 connected to the housing surrounds the cylindrical section 11. The cylinder bushing 12 has a radially inwardly directed collar 13, on which a seal 14 rests. Here, the seal 14 seals the piston against the housing 1. Apertures 15 in the piston 8 allow pressure equalization in the valve. As a result, however, aggressive components in the exhaust gas also get into the interior of the valve. The solenoid 5 comprises an upper stator 16 and a lower stator 17. The two stators 16, 17 each have a central aperture 19, 18, respectively. In the deenergized state of the solenoid 5, an armature 20 firmly connected to the metal pin is situated in the aperture 18 in the lower stator 17. When the solenoid 5 is energized, the armature 20 and, with it, the metal pin 7 is pulled upward with the piston 8. During this process, the armature 20 enters the aperture 19 in the upper stator 16.

[0018] The valve according to the invention in FIG. 2 is illustrated without the armature, the pin and the piston. It has a protective sleeve 21 composed of chromium-nickel steel with a wall thickness of 0.3 mm. The protective sleeve has a cylindrical section 22, which merges at the lower end into a flange 23. The protective sleeve is pressed by its cylindrical section 22 into the aperture 19 in the upper stator 16. The protective sleeve 21 has been pressed on to such an extent that, in the installed state, the flange 23 rests against the lower end of the coil 6. Here, the rubber coating on the protective sleeve 21 ensures improved sealing. The radially outer edge of the flange 23 is overmolded by the housing 1, as a result of which good sealing is achieved.

[0019] Although exemplary embodiments have been discussed in the above description, it should be noted that numerous modifications are possible. Furthermore, it should be noted that the exemplary embodiments are merely examples which are not intended to limit the scope of protection, the applications and the structure in any way. Rather, a person skilled in the art will take from the above description a guideline for implementation of at least one exemplary embodiment, wherein various modifications may be made, in particular with regard to the function and arrangement of the described components, without departing from the scope of protection as can be gathered from the claims and equivalent feature combinations.