JPH0370120B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to an in-tank electric fuel pump that is installed in the fuel tank of an automobile or the like and pumps fuel to the engine, and particularly relates to an in-tank electric fuel pump that is installed in the fuel tank of an automobile or the like and pumps fuel to the engine. This is related to measures against foreign substances such as garbage.

(Prior Art) Conventionally, as shown in FIG. 8, an in-tank electric fuel pump 1 for an automobile or the like is installed almost vertically in a fuel tank 2 via a bracket 3. As shown in the longitudinal cross-sectional view of FIG. 9, the schematic structure of an in-tank electric fuel pump (hereinafter referred to as pump) 1 includes a pump section located at the bottom of a cylindrical housing 4, and a pump section located from the center to the top. Consists of a motor part. The pump section is divided into a plate-shaped body 5 fitted and fixed to the lower end of the housing 4 and a partition wall 6 that forms a boundary with the motor section. A disk-shaped intermediate plate 8 with holes formed therein and spacers 7 are fitted in layers.
A pump chamber 9 is formed in the center of the pump section, and a shaft 10 fixed to the body 5 is located at the axis of the pump chamber 9. Body 5, intermediate plate 8, partition wall 6
An impeller 11 is inserted into an annular intermediate portion formed by the spacer 7 between them, and the central portion thereof is rotatably supported by the shaft 10 via a bearing 12. The body 5 is provided with a fuel inlet 13, and the partition wall 6 is provided with a fuel outlet 14, which communicates with a motor chamber 15.

The motor section is divided by a cover 16 fitted and fixed to the upper end of the housing 4 and a partition wall 6 that forms a boundary with the pump section, and a motor chamber 15 is formed therebetween. A fuel outlet 17 is provided in the center of the cover 16 and extends upward. Motor room 1
An armature 18 is disposed at the axis of the armature 5, and rotating shafts at both ends thereof are rotatably supported by bearings provided on the partition wall 6 and the cover 16, respectively. A magnet 19 corresponding to the armature 18 is attached to the inner periphery of the housing 4. The lower rotating shaft 18a of the armature 18 has a joint 2.
0 is assembled, its pair of claws 20a are inserted into the small axial holes provided in the center of the impeller 11, and when the motor is operated, the impeller 11 rotates and sucks fuel from the fuel intake port 13. . The sucked fuel enters the motor chamber 15 through the fuel outlet 14 and is discharged to the outside through the fuel outlet 17 of the cover 16. A synthetic resin insulating plate 21 is fitted inside the cover 16 to fix a terminal bolt 22 projecting through the cover 16, and a brush 23 is attached to the inside. The brush 23 is electrically connected to the terminal bolt 22 and the armature 18
The commutator 24 is energized.

As a document regarding the above-mentioned fuel pump, there is Japanese Utility Model Application Publication No. 151397/1983.

(Problems to be Solved by the Invention) However, in the fuel pump 1 as described above, foreign matter that could not be removed even if sufficient foreign matter removal measures were taken during the manufacturing process may move due to vibration etc. during the use stage. There is. In this case, foreign matter in the motor chamber 15, such as cutting chips, solder scum, etc., may be transferred from the fuel outlet 14 of the partition wall 6 to the partition wall 6, the spacer 7,
There is a risk that the fuel may fall into the fuel flow path of the pump section composed of the intermediate plate 8 and get caught in the blades of the impeller 11, causing the impeller 11 to become locked and causing the fuel pump 1 to stop functioning.

SUMMARY OF THE INVENTION An object of the present invention is to provide an in-tank electric fuel pump that prevents foreign matter from entering the fuel flow path of the pump section located below, thereby preventing the pump from locking.

(Means for Solving the Problems) The present invention provides an in-tank electric fuel pump in which a motor chamber is disposed above the pump chamber via a partition wall, and a fuel outlet is provided in the partition wall to communicate both chambers. The in-tank electric fuel pump is characterized in that the opening of the fuel outlet on the motor chamber side is oriented perpendicularly to the pump shaft and aligned with the rotational direction of the armature.

(Function) In the above in-tank electric fuel pump,
When foreign objects in the motor room fall through the fuel and reach the fuel outlet installed in the bulkhead between the pump room and the pump room,
Since the openings are oriented perpendicular to the pump shaft, foreign matter is prevented from entering the fuel, and since foreign matter in the fuel in the motor room moves in the direction of rotation of the armature together with the fuel, the openings facing in the same direction prevent foreign matter from entering the pump chamber. cannot be penetrated.

(Example) The present invention will be described below based on drawings showing examples. FIG. 1 is a longitudinal sectional view of the embodiment, and the same components as in the prior art are given the same numbers as in FIG. 9, and their explanation will be omitted. The fuel outlet 32 provided in the bulkhead 31 of the pump section according to the present invention has a configuration as shown in FIGS. 2 and 3. That is, the fuel outlet 32 is provided with a roof 31a that is integrally formed with the partition wall 31. The opening 32a is oriented perpendicularly to the axial direction of the pump, in the same direction as the rotational direction of the armature 18, and is provided at a higher position than the upper surface 31b of the partition wall 31.

In the fuel pump configured as described above, when chips, dust, etc. in the motor chamber 15 that could not be removed during the manufacturing process are moved due to vibration etc. during use and fall above the fuel outlet 32, roof 3
1a and cannot enter into the fuel outlet 32. Further, since foreign substances in the fuel in the motor chamber 15 move in the direction of rotation of the armature 18 together with the fuel, they cannot enter through the opening 32a facing in the same direction as the rotation direction. Furthermore, even if foreign matter that has settled on the partition wall top surface 31b moves, it cannot enter therein because the opening 32a is located at a higher position than the partition wall top surface 31b. In this way, foreign objects are prevented from getting caught in the impeller 11 of the pump chamber 9 and causing the pump to lock.

4 and 5 show a second embodiment. This has a nozzle 33 attached to the upper end of the fuel outlet 32 of the partition wall 31. The nozzle 33 is a mesh made of synthetic resin equivalent to 250 mesh, is integrally molded with the aggregate 34, and is fixed to the partition wall 31. The material of the nozzle 33 may be made of wire mesh. The nozzle opening 33a is oriented in the same direction as the direction of rotation of the armature 18. Since the nozzle 33 is made of mesh, the fuel can pass through it freely, and the opening 33a is not necessary for the function of the fuel outlet, but in order to release foreign matter outside the pump chamber 9,
An opening 33a is required. Thus motor room 1
The foreign matter No. 5 is prevented from entering the pump chamber by the mesh of the nozzle 33, and also cannot enter the fuel outlet 32 through the opening 33a.

6 and 7 show a third embodiment. This is a valve 3 made of a flexible flat plate made of rubber, spring steel, synthetic resin, etc. at the upper end of the fuel outlet 32 of the partition wall 31.
5 is fixed together with a stopper 36 by a pin 37. Opening 35a when valve 35 is open
is oriented in the same direction as the direction of rotation of the armature 18. The fuel sucked up by pumping is
When the valve 35 is pushed open and the fuel flows into the motor chamber 15 and the armature 18 stops rotating, the valve 35 closes the fuel outlet 32. This prevents foreign matter in the motor chamber 15 from entering the pump chamber 9 through the fuel outlet 32.

(Effects of the Invention) As described above, the present invention provides an in-tank electric fuel pump in which a motor chamber is disposed above the pump chamber via a partition wall, and a fuel outlet is provided in the partition wall to communicate the two chambers. orienting the motor chamber side opening of the fuel outlet in a direction perpendicular to the pump shaft;
Furthermore, by matching the direction of rotation of the armature, it is possible to prevent the pump from locking due to foreign matter in the motor chamber entering the fuel flow path of the pump chamber located below.

[Brief explanation of drawings]

1 to 7 show embodiments of the present invention, FIG. 1 is a longitudinal cross-sectional view, and FIG. 2 is a -
3 is a cross-sectional view taken along the - line in FIG.
8 is a side view of an in-tank electric fuel pump installed in a fuel tank, and FIG. 9 is a longitudinal sectional view of a conventional in-tank electric fuel pump. 9...Pump room, 15...Motor room, 18...
... Armature, 31 ... Partition wall, 32 ... Fuel outlet, 32a, 33a, 35a ... Opening.

Claims (1)

[Claims] 1. An in-tank electric fuel pump in which a motor chamber is disposed above the pump chamber via a partition wall, and a fuel outlet is provided in the partition wall to communicate both chambers, and the motor room side opening of the fuel outlet is connected to the pump shaft. An in-tank electric fuel pump characterized by being oriented in a direction perpendicular to the rotational direction of the armature and aligned with the direction of rotation of the armature.