Liquid level detector and fuel pump module including liquid level detector

Patent metadata

Field	Value
Publication number	US-9945713-B2
Application number	US-201415104600-A
Country	US
Kind code	B2
Filing date	Sep 1, 2014
Priority date	Dec 17, 2013
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

A liquid level detector may include a float, an arm member, and a magnetic sensor unit. The float may be attached to the arm member. The arm member may be configured to convert a movement of the float in a vertical direction to a rotational movement. The magnetic sensor unit may include a magnetic sensor and covers. The covers may cover the magnetic sensor. The covers may include a first cover, and a second cover. The first cover may be made of a first resin material. The first cover may cover a whole surface of the magnetic sensor. The second cover may be made of a second resin material different from the first resin material. The second cover may cover a whole surface of the first cover.

First claim

The invention claimed is:

1. A liquid level detector comprising:
a float;
an arm member to which the float is attached, the arm member configured to convert movement of the float in a vertical direction to rotational movement; and
a magnetic sensor unit configured to detect the rotational movement of the arm member, wherein
the magnetic sensor unit comprises:
a magnetic sensor configured to output an analog signal in response to the rotational movement of the arm member; and
a plurality of covers covering the magnetic sensor,
the plurality of covers comprise:
a first cover made of a first resin material, and covering a whole surface of the magnetic sensor; and
a second cover made of a second resin material different from the first resin material, and covering a whole surface of the first cover,
the first resin material has a lower permeability than that of the second resin material to one of gasoline or alcohol, and
the second resin material has a lower permeability than that of the first resin material to another of gasoline or alcohol.

2. The liquid level detector according to claim 1 , wherein
the first resin material has a lower permeability to the gasoline than the second resin material, and
the second resin material has a lower permeability to the alcohol than the first resin material.

3. The liquid level detector according to claim 1 , wherein
the first resin material is epoxy resin, and
the second resin material is polyphenylene sulfide resin.

4. A fuel pump module comprising:
a fuel pump configured to pump fuel in a fuel tank; and
the liquid level detector according to claim 1 ,
wherein the magnetic sensor unit is attached to the fuel pump.

5. The liquid level detector according to claim 1 , wherein
the magnetic sensor unit comprises a lead terminal electrically connected to the magnetic sensor,
the lead terminal penetrates the plurality of covers, and
a part of the lead terminal is exposed to outside of the plurality of covers.

6. The liquid level detector according to claim 5 , wherein
at least one of the first cover and the second cover is in liquid-tight contact with the lead terminal.

Assignees

• Aisan Ind

Inventors

• Nakamura Takahiro

Classifications

• F02M37/106

  the pump being installed in a sub-tank · CPC title

• C08G75/14

  Polysulfides · CPC title

• F02M37/10

  submerged in fuel, e.g. in reservoir · CPC title

• F02D33/003

  Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus (control of electrical fuel pumps F02D41/3082, controlling fuel flow to a common rail F02D41/3845); Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge · CPC title

• B60K2015/03217

  Fuel level sensors · CPC title