Pulsation damper
A pulsation damper for damping pressure medium vibrations in a hydraulic system, has a membrane within a bore of a housing, which membrane is exposed to the pressure medium on its one side and faces a gas-filled cavity inside the housing on its other side, the bore of which is closed by means of a plug. The membrane, in conjunction with the plug and a hollow-cylindrical support body, forms an independently handleable, functionally pre-testable assembly, for which purpose the membrane is substantially cup-shaped, and the support body extends into it.
1. A pulsation damper for damping pressure medium vibrations in a slip-controlled motor vehicle brake system comprising:
a membrane within a bore of a housing, wherein membrane is exposed to the pressure medium on one side and faces a gas-filled cavity inside the housing on an opposing side, wherein the membrane is cup-shaped and has at least one of grooves and ribs defined on the circumference thereof; and
a cup-shaped plug to close the bore of the housing, wherein the membrane and the plug form an independently handleable, functionally pre-testable assembly, wherein the membrane has a sleeve-shaped extension which completely encloses a tubular section of the plug along its outer circumference; and
a plurality of ribs run in the longitudinal direction on the circumference of the membrane between the tubular section and the cup-shaped region of the membrane.
2. The pulsation damper as claimed in claim 1 , further comprising:
a hollow-cylindrical support body which defines a channel;
a nonreturn valve inserted into the channel, wherein the nonreturn valve opens on an outlet region of the channel; and
a compression spring inserted in the channel which acts upon the nonreturn valve.
3. The pulsation damper as claimed in claim 2 , wherein a fixed orifice is arranged in the channel parallel to the nonreturn valve.
4. The pulsation damper as claimed in claim 3 , wherein the fixed orifice is a notch in the region of a valve seat provided for the nonreturn valve in the channel.
5. The pulsation damper as claimed in claim 3 , wherein the channel has a radial inlet region and the outlet region in the support body is axial.
6. The pulsation damper as claimed in claim 5 , wherein the fixed orifice and the nonreturn valve opening in the direction of the outlet region are arranged in the outlet region of the channel.
7. The pulsation damper as claimed in claim 1 , wherein the gas-filled cavity is formed between the membrane and the plug and is separated by the support body from the bore carrying the pressure medium.
8. The pulsation damper as claimed in claim 1 , wherein the membrane is produced from a permanently elastic material.
9. The pulsation damper as claimed in claim 8 , wherein the permanently elastic material is one of rubber and metal.
10. The pulsation damper as claimed in claim 1 , wherein the plug is produced by one of cold extrusion and machining of a free-cutting steel.
11. The pulsation damper as claimed in claim 1 , wherein the end of the extension between the tubular section and the housing is fixed under radial prestress.
12. The pulsation damper as claimed in claim 1 , wherein the plug has a press fit with the housing.