US-12617384-B2 - Hydraulic block for a hydraulic servo power brake system

US12617384B2US 12617384 B2US12617384 B2US 12617384B2US-12617384-B2

Abstract

A bore arrangement of a hydraulic block of a hydraulic unit of a pressure control module of a servo power brake system and in particular an arrangement of receptacles for solenoid valves in a valve side of the hydraulic block.

Inventors

Andreas Weh
Matthias Mayr
Stefan Kaserer

Assignees

ROBERT BOSCH GMBH

Dates

Publication Date: 20260505
Application Date: 20221216
Priority Date: 20220216

Claims (15)

1 . A cuboidal hydraulic block for a hydraulic unit of a hydraulic servo power brake system, the hydraulic block having a top side, a bottom side opposite the top side, a mounting side adjacent the top side, a motor side adjacent the top side, the bottom side, and the mounting side, a valve side opposite the motor side, and a sixth side opposite the mounting side, and the hydraulic block has a port for a brake fluid reservoir in the top side, a brake master cylinder bore which opens on the mounting side, and a servo power cylinder bore which opens on the motor side; wherein the brake master cylinder bore is arranged in the hydraulic block between the servo power cylinder bore and the bottom side; wherein: (i) the hydraulic block has a port for a brake line leading to a pressure control module in the motor side close to the sixth side opposite the mounting side in a plane parallel to the top side of the hydraulic block and intersecting the servo power cylinder bore and/or (ii) the hydraulic block has a port for a brake line leading to the pressure control module in the motor side close to the sixth side opposite the mounting side and close to the brake master cylinder bore; and wherein the hydraulic block has a multiply bent fifth brake fluid line which passes through between the servo power cylinder bore and a simulator cylinder bore and passes via the servo power cylinder bore which connects the port for the brake line leading to the pressure control module to a receptacle for a second isolation valve.
2 . The hydraulic block as recited in claim 1 , wherein the simulator cylinder bore is arranged in an axial plane of the servo power cylinder bore through an edge of the hydraulic block between the top side and a sixth side of the hydraulic block opposite the mounting side.
3 . The hydraulic block as recited in claim 2 , wherein the hydraulic block has a receptacle for a simulator valve in the valve side, and wherein a first brake fluid line leads from the mounting side, parallel to the brake master cylinder bore, to an oblique bore which opens into the receptacle for the simulator valve, wherein a branch from the first brake fluid line opens into the brake master cylinder bore at a circumferential point of the brake master cylinder bore facing the top side of the hydraulic block.
4 . The hydraulic block as recited in claim 3 , wherein a bent third brake fluid line parallel to the sixth side opposite the mounting side between the receptacle for the simulator valve and the simulator cylinder bore on one side of the third brake fluid line and the sixth side on another side of the third brake fluid line connects the receptacle for the simulator valve to the simulator cylinder bore.
5 . The hydraulic block as recited in claim 2 , wherein the hydraulic block has a receptacle for a simulator valve in the valve side, and wherein a sixth brake fluid line, which passes radially through the brake master cylinder bore, leads from the bottom side of the hydraulic block to the simulator cylinder bore.
6 . The hydraulic block as recited in claim 1 , wherein the hydraulic block has two ports for the brake fluid reservoir side by side in the top side of the hydraulic block.
7 . The hydraulic block as recited in claim 6 , wherein, in a plane parallel to the top side of the hydraulic block, a bent fourth brake fluid line connects the simulator cylinder bore to one of the two ports for the brake fluid reservoir.
8 . The hydraulic block as recited in claim 6 , wherein the hydraulic block has a receptacle for a nonreturn valve at a bottom of the port for the brake fluid reservoir, and wherein a sixth brake fluid line, which is parallel to the top side of the hydraulic block, connects the receptacle for a servo power valve to the receptacle for the nonreturn valve.
9 . The hydraulic block as recited in claim 6 , wherein a sixth brake fluid line originating from the bottom side radially crosses the brake master cylinder bore and opens into a groove surrounding the servo power cylinder bore, from where the sixth brake fluid line extends further upward toward the top side of the hydraulic block and, after a bend, opens into one of the two ports for the brake fluid reservoir.
10 . The hydraulic block as recited in claim 1 , wherein a port for the brake fluid reservoir is arranged in the top side of the hydraulic block between the simulator cylinder bore and a motor power bore, which passes through the hydraulic block above the servo power cylinder bore from the motor side to the valve side.
11 . The hydraulic block as recited in claim 1 , wherein the hydraulic block has the receptacle for the second isolation valve and a receptacle for a pressure sensor in the valve side, wherein a bore connects the receptacle for the pressure sensor to the brake master cylinder bore, and wherein a multiply bent sixth brake fluid line connects the bore to the receptacle for the second isolation valve.
12 . The hydraulic block as recited in claim 1 , wherein the hydraulic block has a receptacle for a pressure sensor in the valve side, from which a brake fluid line leads to the brake master cylinder bore which opens into the brake master cylinder bore at a circumferential point facing the top side of the hydraulic block.
13 . The hydraulic block as recited in claim 1 , wherein the hydraulic block has a receptacle for a servo power valve in the valve side, wherein a sixth brake fluid line leads from the servo power cylinder bore to the receptacle for the servo power valve, wherein the hydraulic block has a port for a brake line leading to a pressure control module in the motor side, and wherein a brake fluid line connects the receptacle for the servo power valve to the port for the brake line leading to the pressure control module.
14 . The hydraulic block as recited in claim 1 , wherein the hydraulic block has a receptacle for a servo power valve and a receptacle for a drain valve in the valve side, and wherein an oblique bore leads from the servo power cylinder bore to a brake fluid line which connects the servo power cylinder bore to the receptacle for the servo power valve and to the receptacle for the drain valve.
15 . The hydraulic block as recited in claim 1 , wherein the hydraulic block has a receptacle for a test valve in the valve side, wherein a bore connects the receptacle for the test valve to the brake master cylinder bore, and wherein a bent seventh brake fluid line connects the bore to the servo power cylinder bore.

Description

CROSS REFERENCE The present application claims the benefit under 35 U.S.C. § 119 of German Patent Application No. DE 10 2022 201 571.1 filed on Feb. 16, 2022, which is expressly incorporated herein by reference in its entirety. FIELD The present invention relates to a cuboidal hydraulic block for a hydraulic unit of a hydraulic servo power brake system. BACKGROUND INFORMATION German Patent Application No. DE 10 2016 202 113 A1 describes a narrow, cuboidal hydraulic block for a hydraulic unit of a slip-controlled, hydraulic servo power brake system, in which a brake master cylinder bore is provided continuously from one to an opposite narrow side and a servo power cylinder bore is provided perpendicularly to the brake master cylinder bore likewise continuously through two opposing major sides of the hydraulic block. The conventional hydraulic block moreover has a blind hole as a receptacle for a pedal travel simulator. In order to generate brake pressure using servo power, a servo power piston is displaceable in the servo power cylinder bore with an electric motor by way of a ball-screw drive. The electric motor is arranged coaxially with the servo power cylinder bore externally on one of the two major sides of the hydraulic block and the ball-screw drive is located, likewise coaxially with the electric motor and the servo power cylinder bore, between the electric motor and the servo power piston. The electric motor and the ball-screw drive form a servo power drive and, together with the servo power piston and the servo power cylinder bore, a servo power brake pressure generator for the hydraulic vehicle brake system. In a major side opposite the electric motor, the conventional hydraulic block has receptacles for solenoid valves for brake pressure control. SUMMARY The hydraulic block according to the present invention is provided for a hydraulic unit of a hydraulic servo power brake system. In order to generate hydraulic brake pressure using servo power, the hydraulic block according to the present invention has a servo power cylinder bore which passes through the hydraulic block from one side to an opposite side. These two opposite sides of the hydraulic block are here denoted motor side and valve side. The motor side of the hydraulic block is provided for mounting an electric motor for displacing a servo power cylinder in the servo power cylinder bore, for example by way of a screw mechanism as a rotation/translation conversion mechanism, optionally with interposition of a reducing gear. As a result of the displacement of the servo power cylinder in the servo power cylinder bore, brake fluid is expelled from the servo power cylinder bore and brake pressure generated using servo power. The motor side and the valve side are preferably mutually opposing major sides of the hydraulic block. The further four sides of the cuboidal hydraulic block all adjoin the motor side and the valve side and are here denoted top side, bottom side, mounting side and a sixth side of the hydraulic block opposite the mounting side. A brake master cylinder bore opens on the mounting side of the hydraulic block and the present invention provides that the hydraulic block is mounted with the mounting side on a bulkhead of a motor vehicle in such a way that the top side of the hydraulic block is located at the top. The brake master cylinder bore passes through parallel to the bottom side of the hydraulic block below the servo power cylinder bore, i.e., the brake master cylinder bore is located between the servo power cylinder bore and the bottom side of the hydraulic block. The brake master cylinder bore and the servo power cylinder bore extend at right angles to each other. In the valve side, the hydraulic block according to the present invention has receptacles for solenoid valves and further hydraulic components such as nonreturn valves, hydraulic accumulators, damper chambers and pressure sensors for brake pressure control. Brake pressure control means control of a brake pressure in the vehicle brake system, in brake circuits of the vehicle brake system and/or in hydraulic wheel brakes of the vehicle brake system which are connected to the hydraulic block, control being taken to mean both closed-loop and open-loop control. Brake pressure control may in particular also include slip control. Slip control systems are for example antilock braking, traction control or vehicle dynamics control systems which are commonly known by the abbreviations ABS, TCS and/or VDC. Slip control systems are conventional and are not explained here. The hydraulic block serves for mechanical mounting and hydraulic interconnection of the hydraulic components of the vehicle brake system, brake pressure generation, brake pressure control and/or slip control. The hydraulic components are mounted in the receptacles in the hydraulic block which mainly take the form of cylindrical indentations, blind holes or through holes, in some cases with stepped diameters.