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A tandem brake booster

a technology of tandem brakes and boosters, applied in the direction of brake systems, machines/engines, transportation and packaging, etc., can solve the problems of adversely affecting the ultimate development of output for

Active Publication Date: 2005-05-05
ROBERT BOSCH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] It is an object of this invention to provide a tandem brake booster with a partition member whereby unrestricted fluid communi

Problems solved by technology

This floating movement may adversely effect the ultimate development of an output force by a brake booster.

Method used

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  • A tandem brake booster
  • A tandem brake booster
  • A tandem brake booster

Examples

Experimental program
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Embodiment Construction

[0012] A tandem brake booster 10 illustrated in FIG. 1 is made according to the present invention and is defined by a housing 11. Housing 11 is constructed a front shell 12 that is joined to a rear shell 14 by rolling a lip 16 on the rear shell 14 over an annular flange 18 on the front shell 12 to create a unitary structure of a type illustrated in U.S. Pat. No. 6,390,567. In joining the front shell 12 to the rear shell 14, an interior cavity 20 is created that is separated into a first chamber 22 and a second chamber 24 by a first diaphragm assembly 26 and into a third chamber 28 and a fourth chamber 30 by a second diaphragm assembly 32. The second chamber 24 is separated from the third chamber 28 by a partition member 34 that engages the rear shell 14 and a hub 36 that extends through the first 26 and second 32 diaphragm assemblies. The hub 36 has a stepped internal bore 38 that receives a control valve 40 that is connected to a brake pedal. The hub 36 has a radial opening 42 ther...

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PUM

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Abstract

A tandem brake booster has a housing defined by a front shell that is joined to a rear shell to create an interior cavity. The interior cavity is divided by first and second diaphragm assemblies that are separated by a partition member to respectively isolate a first chamber from a second chamber and a third chamber from a fourth chamber. The first and third chambers are connected to fluid having a substantially constantly first pressure while the second and fourth chambers are connected to selectively receive the fluid at the first pressure or fluid at a second pressure. The partition member is characterized by a disc with a cylindrical body extending from a ledge formed on a peripheral surface of the disc and a flange located on the cylindrical body between the ledge and an end face of the cylindrical body.

Description

BACKGROUND OF INVENTION [0001] This invention relates to a partition member for dividing an internal cavity within a housing of a brake booster into a plurality of operational chambers wherein the partition member is fixed within the internal cavity and as a result the size of a flow path between a portion of the chamber is substantially un-effected during a brake application. [0002] In the development of brake boosters it became evident that by dividing the interior cavity of a housing by two diaphragm members a resultant output force could be significantly increased. In some of the resulting tandem brake boosters the communication between the chambers is achieved through passages in a hub that retains a control valve that is responsive to an operator input while in other tandem brake boosters such as disclosed in U.S. Pat. Nos. 3,083,698; 3,517,588 and 3,760,693 wherein the rear chambers are connected to each other through flow path created between a peripheral surface of a partit...

Claims

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Application Information

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IPC IPC(8): B60T13/563B60T13/569
CPCB60T13/569B60T13/563
Inventor HEWITT, WAYNEWICKER, JOSEPH M.STRAW, RICHARDHURLBUTT, RYAN
Owner ROBERT BOSCH CORP