Browse Prior Art Database

A COMBINED ASPIRATOR WITH AN INTEGRATED DUAL CHECK VALVE ASSEMBLY

IP.com Disclosure Number: IPCOM000239163D
Publication Date: 2014-Oct-17
Document File: 1 page(s) / 220K

Publishing Venue

The IP.com Prior Art Database

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 53% of the total text.

Page 01 of 1

A COMBINED ASPIRATOR WITH AN INTEGRATED DUAL CHECK VALVE ASSEMBLY

     Vacuum supply to a brake booster is dependent on the engine vacuum which is often supplied by the intake manifold. This vacuum is often dependent on powertrain calibration and other loads in the engine. During driving conditions and different type of throttle apply, this requirement often changes. Also, the vacuum available for power brake system always goes down when there is an altitude condition. Vacuum boost conditions are also needed to compensate for engines that produce low vacuum levels, loss of vacuum due to high altitude, initial green engine conditions, initial brake pad break-in, and for underhood package space. Often, to help in vacuum generation, a venturi nozzle is used. This venturi unit is part of a combined assembly of the aspirator. The other channel is a straight channel that basically provides flow to the consumers of the vacuum. Both the channels are connected to each other to form a combined assembly.

     A vacuum causes air flow through the unit and an increased vacuum level is generated at the venturi. If this increased vacuum rate at the venturi is greater than that provided by the source vacuum, the straight tube's check valve diaphragm is seated and the boosted vacuum is allowed to generate. However, if the source vacuum rate is greater than that of the venturi, the straight tube's check valve diaphragm unseats and provides the increase. Both valves will seat when the vacuu...