Suction Head for Connection to a Fuel Hose

Patent metadata

Field	Value
Publication number	US-2018128221-A1
Application number	US-201715729015-A
Country	US
Kind code	A1
Filing date	Oct 10, 2017
Priority date	Nov 10, 2016
Publication date	May 10, 2018
Grant date	—

Abstract

A suction head for connection to a fuel hose in a fuel tank has a base member made of an injection molding material. The base member has a peripheral wall surface provided with cutouts and also has an end face opening. A cap closes off the end face opening. A connecting socket for the fuel hose is provided on the suction head. A first filter element is received inside the base member. A second filter element covering the cutouts is provided and is made of a filter fabric, wherein the filter fabric is a twill weave fabric or a satin weave fabric. The filter fabric has a mesh size that is greater than 10 μm and smaller than 25 μm. A power tool with a four-stroke engine is provided with such a suction head in the fuel tank.

First claim

What is claimed is:

1 . A suction head for connection to a fuel hose in a fuel tank, the suction head comprising:
a base member comprised of an injection molding material, the base member comprising a peripheral wall surface provided with cutouts and further comprising an end face opening; a cap closing off the end face opening: a connecting socket for the fuel hose; a first filter element received inside the base member; a second filter element covering the cutouts and comprised of a filter fabric, wherein the filter fabric is a twill weave fabric or a satin weave fabric; the filter fabric having a mesh size that is greater than 10 μm and smaller than 25 μm.

2 . The suction head according to claim 1 , wherein the mesh size is in a range of 12 μm to 20 μm.

3 . The suction head according to claim 2 , wherein the mesh size is 15 μm.

4 . The suction head according to claim 1 , wherein the mesh size of the filter fabric is smaller than a pore size of the first filter element.

5 . The suction head according to claim 1 , wherein the peripheral wall surface of the base member comprises stays and the stays separate the cutouts from each other, wherein the filter fabric is secured on the stays.

6 . The suction head according to claim 5 , wherein in the region of the stays the injection molding material of the base member engages with form fit a fabric structure of the filter fabric.

7 . The suction head according to claim 1 , wherein the filter fabric is a filter hose comprising a first open end and a second open end opposite the first open end, wherein the first open end of the filter hose is embedded seal-tightly in the injection molding material of the base member.

8 . The suction head according to claim 7 , wherein the filter fabric at the first open end of the filter hose is penetrated with form fit by the injection molding material of the base member.

9 . The suction head according to claim 1 , wherein the first filter element has a pore size in a range of 30 μm to 70 μm.

10 . The suction head according to claim 1 , wherein the injection molding material is a plastic material.

11 . The suction head according to claim 1 , wherein the filter fabric is a screen fabric comprised of monofil threads.

12 . The suction head according to claim 11 , wherein a thread size of the monofil threads is greater than the mesh size of the filter fabric.

13 . A power tool comprising:
a four-stroke engine comprising a valve train for an inlet valve and/or an outlet valve arranged in the combustion chamber of the four-stroke engine, wherein the valve train is lubricated by a fuel/oil mixture processed with combustion air; a fuel tank and a fuel line connected to the fuel tank, wherein the fuel/oil mixture is supplied by the fuel line from the fuel tank to a mixture forming device of the four-stroke engine; wherein the fuel line comprises a flexible fuel hose that projects into the fuel tank and has a projecting free end; a suction head comprising:
a base member comprised of an injection molding material, the base member comprising a peripheral wall surface provided with cutouts and further comprising an end face opening;
a cap closing off the end face opening: a connecting socket for the fuel hose; a first filter element received inside the base member;
a second filter element covering the cutouts and comprised of a filter fabric, wherein the filter fabric is a twill weave fabric or a satin weave fabric;
the filter fabric having a mesh size that is greater than 10 μm and smaller than 25 μm;
wherein the projecting free end is connected to the connecting socket of the suction head.

Assignees

• Stihl Ag & Co Kg Andreas

Inventors

• Riehmann Jens
• Schliemann Harald
• Dangelmaier Manuel

Classifications

• B01D35/005

  Filters specially adapted for use in internal-combustion engine lubrication or fuel systems · CPC title

• F02B75/02

  Engines characterised by their cycles, e.g. six-stroke · CPC title

• F02M37/50

  Filters arranged in or on fuel tanks · CPC title

• B01D29/58

  arranged concentrically or coaxially · CPC title

• F02M37/22 Primary

  Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system · CPC title