Pressure compensation unit

• US 8,413,496 B2
• Filed: 12/01/2008
• Issued: 04/09/2013
• Est. Priority Date: 01/15/2008
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Eslami, Reza, Habibi, Masoud, Ott, Marcell, Fessele, Thomas
• Primary Examiner(s): Kirkland, III, Freddie
• Application Number:
  US12/735,346
• Publication Number:
  US 20110041594A1
• Time in Patent Office: 1,590 Days
• Field of Search: 731/144.3, 737/08
• US Class Current: 73/114.43
• CPC Class Codes: B60K 15/03 Fuel tanks chassis frame comprising fluid storage compartment B62D21/16 ; Details of the fuel feeding system related to the fuel tank F02M37/0076
• CPC Class Codes: G01L 19/003 using a detachable interface or adapter between the process medium and the pressure gauge
• CPC Class Codes: G01L 19/0636 using particle filters
• CPC Class Codes: G01L 19/0654 against moisture or humidity

Abstract

A pressure-compensation unit, particularly for a tank-pressure sensor in a tank of a motor vehicle. The pressure-compensation unit includes a housing lid and a gas-permeable filter diaphragm, which covers an air hole. The pressure-compensation unit includes a cap-shaped cover element, which covers the filter diaphragm.

Claims

1. A pressure-compensation unit for a tank pressure sensor of a motor vehicle, comprising:

a housing lid, an air hole, a gas-permeable filter diaphragm which covers the air hole, and a cap-shaped cover element which covers the filter diaphragm, wherein the housing lid has a dome-shaped prosection having a planar surface, the air hole is located in the planar surface, and the filter diaphragm is adhesion-bonded onto the planar surface.

2. The pressure-compensation unit as recited in claim 1, wherein the filter diaphragm is made from a water-repellent material which is impermeable for fluid.

3. The pressure-compensation unit as recited in claim 1, wherein the cap-shaped cover element is able to be latched to the dome-shaped projection.

4. The pressure-compensation unit as recited in claim 1, wherein latching segments are provided along the circumference of the dome-shaped projection, which are separated from each other in the circumferential direction by gaps, which form a gap width for an air flow.

5. The pressure-compensation unit as recited in claim 3, wherein the filter diaphragm is protected when the cap-shaped cover element is latched, and a connection exists between a reference-pressure space and the environment.

6. The pressure-compensation unit as recited in claim 5, wherein the filter diaphragm is supported by direct contact with the planar surface to protect against excessive loading, and an air flow takes place through an air hole.

7. A tank-pressure sensor for a fuel tank of a motor vehicle comprising the pressure-compensation unit as recited in claim 1.

8. A pressure-compensation unit for a tank pressure sensor of a motor vehicle, comprising:

a housing lid, an air hole, a gas-permeable filter diaphragm which covers the air hole, and a cap-shaped cover element which covers the filter diaphragm, wherein the housing lid has a depression whose base has an opening to the atmosphere, and the filter diaphragm is adhesion-bonded at the edge of the opening to the atmosphere onto the base of the depression.

9. The pressure-compensation unit as recited in claim 8, wherein the opening to the atmosphere is covered by the filter diaphragm, and the housing lid has at least one opening to a reference-pressure space.

10. The pressure-compensation unit as recited in claim 8, wherein the cap-shaped cover element is adhesion-bonded to the housing lid in airtight manner.

11. The pressure-compensation unit as recited in claim 10, wherein channels for air flow are defined on an inner side of the cap-shaped cover element, and projections supporting the filter diaphragm are implemented on the inner side.

12. The pressure-compensation unit as recited in claim 11, wherein when the cap-shaped cover element is adhesion-bonded in the depression, the channels on the inner side of the cap-shaped cover element provide the air flow from an intake opening in the housing lid to at least one opening into a reference-pressure space.

13. The pressure-compensation unit as recited in claim 11, wherein the filter diaphragm is supported by the projections at the inner side, and an air flow through the channels takes place.

14. The pressure-compensation unit as recited in claim 9, wherein the opening to the atmosphere in the base of the depression is divided by a segment and the filter diaphragm is supported by the segment.

15. The pressure-compensation unit as recited in claim 14, wherein the cap-shaped cover element at its circumference includes a plurality of clamping lugs, the clamping lugs being latched in a wall bordering the depression.