# US 4,397,219 A · Brake booster for automotive vehicles

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- Number: US 4,397,219 A
- Document ID: US4397219A
- Status: Granted
- Kind: A
- Application number: 06/231,691
- Filed: 1981-02-05
- Granted: 1983-08-09
- Earliest claimed: 1980-03-20
- Assignees: ITT Industries, Inc.
- Inventors: Juan Belart
- Web page: https://patentgrep.com/patent/US4397219A

## CPC

- B60T 13/567: characterised by constructional features of the casing or by its strengthening or mounting arrangements
- B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES

## Abstract

A brake booster for automotive vehicles includes a low-pressure casing which is sealingly subdivided into a low-pressure chamber and a working chamber by an axially movable wall. The low-pressure chamber includes a casing port adjacent the low-pressure chamber and a portion of the splashboard of the automotive vehicle to which the casing part adjacent the low-pressure chamber is secured at an outer annular sealing surface of the portion of the splashboard in a sealed relationship thereto. Located at the portion of the splashboard is an inner annular sealing surface to which the end of a central reinforcement tube for the low-pressure casing adjacent the working chamber is sealingly connected.

## Claims

### Claim 1

A brake booster for an automotive vehicle comprising:
a low-pressure casing sealingly subdivided into a low-pressure chamber and a working chamber by an axially movable wall, said working chamber being connectible to one of said low-pressure chamber and atmosphere by a mechanically actuated control valve, said casing including a first casing part adjacent said low-pressure chamber having an outer rim at the periphery thereof and a second casing part adjacent said working chamber, said second casing part being a portion of a splashboard of said vehicle having an outer annular sealing surface and an inner annular sealing surface, said movable wall including a rolling diaphragm having an outer sealing bead embracing said outer rim and in a sealed relationship with said outer sealing surface to seal said first and second casing parts and said movable wall to one another; and
a force-transmitting member axially penetrating said movable wall in a sealed relationship therewith, one end of said member being connected to said first casing part and the other end of said member being connected in a sealed relationship with said inner sealing surface.

### Claim 2 (depends on 1)

A brake booster according to claim 1, wherein
said inner sealing surface is provided in a bottom surface of a cup-like indentation of said portion of said splashboard.

### Claim 3 (depends on 1, 2)

A brake booster according to claims 1 or 2, wherein
said outer sealing surface is provided by a circumferential inclination in said portion of said splashboard.

### Claim 4 (depends on 1, 2)

A brake booster according to claim 1 or 2, wherein
said outer sealing surface is provided by a circumferential, substantially cylindrical shoulder of said portion of said splashboard.