Fuel pump for vehicle having brush holder for preventing shake of brush

Abstract

The present invention relates to a fuel pump for vehicle supplying power to a commutator and an armature through a brush to prevent the brush from shake, which comprises the brush, a spring mounted on a top of the brush, the commutator contacted to a bottom of the brush, a brush holder surrounding the brush and the spring, and a first hole formed for fuel flow at a front side of the brush holder in a rotational direction of the commutator based on the brush.

Claims

1. A brush holder provided in a fuel pump for a vehicle to prevent shaking of a brush, the fuel pump comprising: the brush; a spring mounted on a top of the brush; and a commutator, a top of which is in contact with a bottom of the brush, to supply power to the commutator and an armature through the brush; wherein the brush holder is formed to surround the brush and the spring, and a lower portion of the brush holder is opened so that the brush and the commutator are in contact with each other; wherein the brush holder comprises a first hole formed for fuel ingress at a front side of the brush holder in a rotational direction of the commutator based on the brush; and wherein the first hole is formed at a position corresponding to an upper portion of the brush that is in a tilted state when the commutator rotates and thereby a lower portion of the brush moves toward the front side of the brush holder, such that the upper portion of the brush is adhered to a back side of the brush holder through fuel introduced in a direction opposite to the rotational direction of the commutator, thereby preventing the brush from shaking.

2. The brush holder according to claim 1, wherein the first hole is extended to a bottom of the brush holder and a bottom of the first hole is open.

3. The brush holder according to claim 1, wherein the brush holder further includes a second hole for fuel flow at a lower portion of the back side of the brush holder in the rotational direction of the commutator based on the brush.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a cross-sectional view of a fuel pump.

(2) FIG. 2 is a schematic top view of dashed area in FIG. 1 showing operation of the fuel pump.

(3) FIG. 3 is a first embodiment of a brush holder according to the present invention.

(4) FIG. 4 is a second embodiment of the brush holder according to the present invention.

(5) FIG. 5 is a third embodiment of the brush holder according to the present invention.

DETAILED DESCRIPTION OF EMBODIMENTS

(6) Now the fuel pump of the present invention will be explained in detail with the accompanying drawings. The accompanying drawings are exemplary ones for explaining the technical characteristics of the present invention. Therefore, the technical scope of the present invention is not limited to the drawings accompanied.

(7) The present invention relates to a fuel pump for vehicle having a brush holder to prevent shake of brush when the pump is driven. FIG. 3 is a cross sectional view of A-A in FIG. 2 and shows a first embodiment of a brush holder for preventing shake of a brush according to the present invention. As described in FIG. 1, the fuel pump comprises a brush 100, a spring 200, a commutator 300 and a brush holder 400 designed to prevent shake of brush 100. The spring 200 is mounted on a top of the brush 100 and commutator 300 is located beneath of the brush 100 with the bottom of the brush 100 contacting with the top of the commutator 300.

(8) The brush holder 400 surrounds the brush 100 and the spring 200, and its bottom is opened. Also, the brush holder 400 comprises a first hole 410. The first hole 410 is a path for fuel injected to an inside of the brush holder 400. More specifically, the brush holder 400 comprises the first hole 410 formed at an upper portion of a front side (A) of the brush holder 400 in a rotational direction of the commutator 300 based on the brush 100. The first hole 410 is a path for fuel injected to the inside of the brush holder 400 (where the brush 100 is positioned) in a direction opposite to the rotational direction of the commutator 300.

(9) FIG. 2 is a schematic top view of dashed area in FIG. 1 and shows operation of the fuel pump. As described in FIG. 2 and FIG. 3, when the commutator 300 rotates, the bottom of the brush 100 contacted to the commutator 300 also moves in the rotational direction of the commutator 300 by friction. At this time, if fuel in high pressure is injected to the inside of the brush holder 400 through the first hole 410, the top of the brush 100 moves in a direction opposite to the rotational direction of the commutator 300 due to the injected fuel through the first hole 410. At this moment, the direction of force toward the top and the bottom of the brush holder 400 is opposite, and if the constant force is provided, the brush 100 may be fixed in a tilted position and minimize its shake.

(10) FIG. 4 is a cross sectional view of A-A in FIG. 2 and shows a second embodiment of the brush holder for preventing shake of the brush according to the present invention. As described in FIG. 4, the brush holder 400 of the second embodiment comprises the first hole 410 extended from the upper portion to the bottom of the brush holder which is open.

(11) This configuration increases inflow of fuel through the first hole 410, so that the top of the brush 10 is moved in a direction opposite to the rotational direction of the commutator 300. That is, when rotational force of the commutator 300 is high, more fuel may be injected through the first hole 410. Therefore, the brush 100 inclined may be less shaken by moving the top of the brush 100 in a direction opposite to the rotational direction of the commutator 300.

(12) FIG. 5 is a cross sectional view of A-A in FIG. 2 and shows a third embodiment of the brush holder for preventing shake of the brush according to the present invention. As described in FIG. 5, the brush holder 400 of the third embodiment of present invention further comprises a second hole 420.

(13) The second hole 420 is formed at a lower portion of a back side (A) of the brush holder 400 in the rotational direction of the commutator 300. More specifically, the first hole 410 is, based on the brush 100, formed at the upper portion of the front side (A) of the brush holder 400 in the rotational direction of the commutator 300 and the second hole 420 is, based on the brush 100, formed at the lower portion of the back side (A) of the brush holder 400 in the rotational direction of the commutator 300.

(14) At this time, the top and the bottom of the brush 100 moves in opposite directions respectively by fuel injected through the first hole 410 and the second hole 420, and since the top and the bottom of the brush 100 is adhered to the inside of the brush holder 400 through continuous inflow of the fuel, shake of the brush 100 may be minimized.

(15) Diameter of the first hole 410 and the second hole 420 should be shorter than that of the brush 100 to avoid that the brush 100 is caught in or comes out through the first hole 410 and the second hole 420.

(16) The present invention is not limited to the embodiments mentioned above but it may be widely applied to technical fields in various forms within its purpose.

DETAILED DESCRIPTION OF MAIN ELEMENT

(17) 100: Brush 200: Spring 300: Commutator 400: Brush holder 410: First hole 420: Second hole