Brake master cylinders with contoured pressure pistons for motor vehicle braking systems

Abstract

The invention relates to a master cylinder arrangement for a braking system of a motor vehicle, comprising: a master cylinder housing (12) having a cylindrical recess (14); At least one pressure piston (16, 18) moving and sealingly guided in a cylindrical recess (14) of the cylinder housing (12); a fluid reservoir for storing brake fluid via a fluid channel ( 44) is in fluid communication with the master cylinder housing (12). The at least one pressure piston (16, 18) together with the brake master cylinder housing (12) encloses in a sealed manner a pressure chamber (56, 58) which is or can be fluidically connected to a fluid circuit of the motor vehicle brake system. and in fluid communication or disconnection with the fluid reservoir depending on the position of the associated pressure piston (16, 18). A sealing mechanism (46) surrounding the pressure piston (16, 18) is arranged between the outer peripheral surface (60, 62) of the pressure piston (16, 18) and the cylindrical recess (14) of the brake master cylinder housing (12). ,48). In order to improve the responsiveness of the braking system of a motor vehicle, according to the invention, in the axial region where the initial position of the pressure piston (16,18) spans the sealing mechanism (46,48) in the axial direction, the pressure piston (16,18) The outer peripheral surface (62) of is provided with profiled contours (64, 66) which create fluid communication between said fluid reservoir and pressure chambers (56, 58).

Description

technical field [0001] The invention relates to a brake master cylinder arrangement with a specially contoured pressure piston for a braking system of a motor vehicle, the brake master cylinder arrangement comprising: [0002] – brake master cylinder housing with cylindrical recess, [0003] - at least one pressure piston, which is guided in a cylindrical recess in the master cylinder housing in a movable and sealing manner along the longitudinal axis, [0004] - a fluid reservoir storing brake fluid, the fluid reservoir being in fluid communication with the brake master cylinder housing via a fluid passage, [0005] wherein the at least one pressure piston together with the brake master cylinder housing encloses in a sealed manner a pressure chamber which is or can be in fluid communication with the fluid circuit of the motor vehicle brake system and which, depending on the position of the associated pressure piston, the pressure The cavity is in or out of fluid communicati...

AI Technical Summary

Problems solved by technology

However, this movement of the sealing member 1 in the recess 2 results in a delayed pressure build-up, since the complete closure of the radial opening 8 is then prolonged

In addition, the movement of the sealing mechanism 1 within the recess 2 leads to leakage flow, since this movement is not fully controllable

In addition, the built-in throttling effect of the seal at the beginning of displacement, in particular due to the radially inner sealing edge 9 on the right in FIG.

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