Master cylinder for a regulated braking system

Patent metadata

Field	Value
Publication number	US-9657752-B2
Application number	US-201013515898-A
Country	US
Kind code	B2
Filing date	Dec 15, 2010
Priority date	Dec 15, 2009
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

A master cylinder for a regulated braking system having at least one piston, which is movable in a housing and which is sealed from a pressure chamber by a sealing element arranged in a ring groove of the housing, which can be connected to an unpressurized supply chamber by control passages designed in the pistons. In order to reduce the flow resistance of the control passages at the same dead stroke, the control passages have a control edge designed parallel to a piston end face of at least one of the pistons.

First claim

The invention claimed is:

1. A master cylinder for a regulated braking system having at least one piston, which is movable in a housing and which is sealed off by a sealing element arranged in an annular groove of the housing from a pressure chamber, which can be connected to an unpressurized replenishment chamber by a plurality of control passages formed in the piston and distributed over a circumference of the piston, wherein each control passage comprises an axially extending groove on an outer surface of the piston that is located adjacent the sealing element, and wherein each axially extending groove includes a control edge formed on the outer surface of the piston parallel to a piston end face, and each groove has a beveled surface (i) leading from the control edge towards a base surface of the groove, and (ii) intersecting side surfaces of the groove that extend radially from the base surface of the groove.

2. The master cylinder as claimed in claim 1 , wherein the axial grooves are provided in a dovetail shape.

3. The master cylinder as claimed in claim 1 , wherein the control passages are provided as radial apertures in the piston.

4. The master cylinder as claimed in claim 1 , wherein the control passages are provided in the piston by stamping.

5. The master cylinder as claimed in claim 1 , wherein the piston is made of plastic.

6. The master cylinder as claimed in claim 1 , wherein the piston is produced by an extrusion process.

7. The master cylinder as claimed in claim 1 , wherein the piston is of cup-shaped design with a bottom, and a first, centrally arranged fixing element for a return spring of the piston is provided on an inner side of the bottom.

8. The master cylinder as claimed in claim 1 , wherein a second, centrally arranged fixing element for a magnetic guide element is provided on an outer side of the bottom.

Assignees

• König Harald
• Bischoff Andreas
• Drott Peter
• Inaba Makato
• Kreh Heinrich
• Jungmann Udo
• Janosek Filip
• Continental Teves Ag & Co Ohg

Inventors

• König Harald
• Bischoff Andreas
• Drott Peter
• Inaba Makato
• Kreh Heinrich
• Jungmann Udo
• Janosek Filip

Classifications

• B60T11/101 Primary

  equalising arrangements · CPC title

• F15B15/00 Primary

  Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith · CPC title

• B60T11/232

  Recuperation valves · CPC title

• B60T11/236

  Piston sealing arrangements · CPC title

• B60T11/16

  Master control, e.g. master cylinders (master cylinders associated with vacuum boosters B60T13/565) · CPC title