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Fuel feed apparatus

A fuel supply device and fuel technology, applied to liquid fuel feeders, charging systems, engine components, etc., can solve problems such as difficulty in ensuring the airtightness of joints

Inactive Publication Date: 2007-08-29
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, it is difficult to ensure airtightness at the connection between the suction pipe and the sub tank due to the difference in dimensional changes

Method used

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  • Fuel feed apparatus
  • Fuel feed apparatus

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0039] As shown in FIGS. 1 and 2 , a fuel supply device is accommodated in a fuel tank 1 . The fuel supply device supplies fuel in the fuel tank 1 to a fuel consuming device outside the fuel tank 1 such as an engine. The fuel supply device includes a sub tank 2 and a fuel pump 3 . The sub tank 2 is arranged at the bottom of the fuel tank 1 . The fuel pump 3 is housed in the sub tank 2 .

[0040] The sub-tank 2 is made of resin so as to have a substantially cylindrical or substantially box shape with a bottom. In this embodiment, the sub-tank 2 is substantially cylindrical. The sub-tank 2 contains fuel therein at a level independent of the level in the fuel tank 1 .

[0041] The bottom 21 of the auxiliary tank 2 is arranged on the bottom of the fuel tank 1 . The bottom 21 has a through hole 22 . The bottom 21 has a communicating portion 21 a communicating with the bottom of the fuel tank 1 . The communication portion 21a has a space capable of accommodating the suction f...

no. 2 approach

[0075] As shown in FIG. 4 , in the second embodiment, the first protrusion 123 is provided on the bottom 21 . An elastic member 80 having a cylindrical portion 81 and a first flange 82 is disposed between the outer periphery of the first protrusion 123 and the inner periphery of the suction pipe 56 . The first protrusion 123 provided on the bottom 21 is substantially cylindrical. The first protrusion 123 extends toward the fuel pump 3 . A through hole 122 is defined in the first protrusion 123 . In this embodiment, the protruding height of the first protrusion 123 from the bottom 21 is greater than the thickness of the bottom 21 . The height of the first protrusion 123 may be equal to or less than the thickness of the bottom 21 .

[0076] The second protrusion 124 is disposed on the end surface of the bottom 21 opposite to the first protrusion 123 . The second protrusion 124 is cylindrical and extends toward the fuel tank 1 . The first protrusion 123 and the second protru...

no. 3 approach

[0084] As shown in FIG. 5 , the filter 190A has a sleeve 93 . The outer periphery of the sleeve 93 is fitted on the inner periphery of the suction pipe 56 so that the filter 190A is mounted on the suction pipe 56 .

[0085] The outer periphery of the sleeve 93 of the filter 190A fits within the inner periphery of the suction pipe 56 .

[0086] A sleeve 93 protrudes from an upper end surface of the mounting member 92A. The upper end surface of the mounting member 92A abuts against the end surface of the suction pipe 56 on the fuel tank 1 side, whereby the mounting position of the filter 190A is fixed relative to the suction pipe 56 . This configuration also produces the same effects as those of the first embodiment.

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PUM

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Abstract

A fuel feed apparatus is accommodated in a fuel tank. The fuel feed apparatus includes a sub-tank that is provided in a bottom of the fuel tank. The fuel feed apparatus further includes a fuel pump that is accommodated in the sub-tank. The fuel pump includes an impeller that defines a plurality of pump chambers. The fuel pump has a first suction passage through which fuel flows from outside the sub-tank into at least one of the plurality of pump chambers. The fuel feed apparatus further includes an elastic member that seals between the first suction passage and the sub-tank.

Description

technical field [0001] The invention relates to a fuel supply device. Background technique [0002] According to US-5596970, a fuel tank houses a fuel supply including a secondary tank. In such a fuel supply device, two rows of pump chambers are arranged in a single impeller. Fuel is drawn from outside the secondary tank through one of the pump chambers. Fuel is sucked from inside the auxiliary tank through another pump chamber. In this configuration, the suction pipe through which the fuel pump is connected to the sub tank is formed of a hard material such as metal or hard resin. Therefore, the vibration of the fuel pump is easily transmitted to the sub tank. [0003] In US-6854451 (JP-A-2004-190661), a support member made of resin supports a fuel pump to absorb vibration. In this configuration, it is conceivable to use elastic resin for the suction pipe. However, when the suction pipe is made of elastic resin, it is difficult to secure the rigidity of the suction pip...

Claims

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Application Information

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IPC IPC(8): F02M37/04
Inventor 友松健一间真司岩成荣二五十岚龙二山田胜久
Owner DENSO CORP