JP2884633B2 - In-tank pump for internal combustion engine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a fuel pump for an internal combustion engine.

[Conventional technology]

Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 63-259155, a fuel supply pump is provided in a fuel tank, and the pump supplies fuel to an automobile engine.

[Problems to be solved by the invention]

However, in such an in-tank pump for an internal combustion engine, when the vibration of the pump is large, there is a problem that the vibration of the pump is transmitted to the fuel tank, and the vibration noise is heard by an occupant in the passenger compartment. Was.

The present inventors have conducted various experiments to determine the transmission path of the vibration sound, and as a result, have found a path that greatly contributes to the transmission of vibration.

An object of the present invention is to provide a pump for an internal combustion engine that can suppress noise caused by vibration of the pump while having a simple configuration.

[Means for solving the problem]

According to the present invention, a housing for accommodating an electric motor and one end thereof are fixed by caulking to the housing,
A fuel passage forming member having a fuel passage formed at the other end; and a pump for an internal combustion engine that supplies fuel to the internal combustion engine through the fuel passage forming member by driving the electric motor. The gist of the present invention is a pump for an internal combustion engine assembled to a housing with a vibration damping member for attenuating the vibration.

[Action]

Vibration generated by driving of the electric motor tends to propagate from the housing to the fuel tank via the fuel passage forming member, but the vibration is attenuated by the vibration damping member to suppress noise generation.

〔Example〕

An embodiment in which the present invention is embodied in an in-tank pump for an internal combustion engine mounted on an automobile will be described with reference to the drawings.

FIG. 1 shows an in-tank pump 1 for an internal combustion engine according to this embodiment.
FIG. 2 shows a state in which the in-tank pump 1 is mounted in the fuel tank 2.

As shown in FIG. 1, the in-tank pump 1 includes a pump unit 4 provided at a lower end of a cylindrical housing 3, a motor unit 5 for housing an electric motor M at an intermediate portion of the housing 3, and a housing 3 And an ejection unit 6 provided at the upper end of the nozzle. The pump section 4 includes a pump chamber forming member 7,
A regenerative pump type impeller (impeller) 9 is accommodated between the two members 7,8. Here, the housing 3 is made of iron, and the pump chamber forming members 7 and 8 are made of aluminum.

The armature 1 is provided on the pump chamber forming members 7 and 8 by bearings 10.
One rotating shaft 12 is rotatably supported, and this rotating shaft 1
2, an impeller 9 is fitted so as to be slidable in the axial direction.
The pump chamber forming member 8 is caulked at one end of the housing 3 via an annular elastic member 13. The lower surface of the rotating shaft 12 is received by a thrust receiver 14.

In the motor section 5, two field magnets (permanent magnets) 15 are supported by a magnet spring 16 on the inner peripheral surface of the housing 3. The armature 11 is provided inside the field magnet 15. In the discharge unit 6,
It has a resin bearing holder 17 and a resin frame end 18 as a fuel passage forming member. The bearing holder 17 holds a brush 19 and a bearing 20.
The frame end 18 holds a check valve 21 and a power supply terminal 22. Further, the bearing holder 17 is press-fitted and fixed in the housing 3. The frame end 18 is inserted into the housing 3 by a loose fit,
The housing 3 is fixed by caulking the housing 3 with the vibration damping member 23 interposed therebetween. In this embodiment, the vibration damping member 23 uses an O-ring made of a rubber material.

As shown in FIG. 2, an opening 2a is formed in the ceiling surface of the fuel tank 2, and a flange 25 is fixed to the opening 2a with a screw 26 via a seal member 24. Flange
A first bracket 27 extending vertically is fixed to 25,
Further, a second bracket 28 extending in the horizontal direction is engaged and fixed to a lower end portion of the first bracket 27 by a screw 29 in a state of being engaged. Further, an iron discharge pipe 30 is brazed to the flange 25, and a connection member 31 having a communication space 31a is fixed to one end of the discharge pipe 30, and the other end of the discharge pipe 30 is connected to an internal combustion engine of a vehicle. Have been.

The filter 32 is connected to the fuel suction pipe 34a of the in-tank pump 1 and the in-tank pump 1
Rubber 33 is sandwiched between the bottom surface of the second bracket 28 and the second bracket 28.
On the other hand, the discharge pipe 34b of the in-tank pump 1 has a resin O-ring presser 35 disposed on the outer peripheral portion thereof.
And is inserted into the communication space 31a of the connection member 31 via the. The electric motor M is grounded via the power supply terminal 22, the cord 37 and the first bracket 27, and is connected to the battery via the power supply terminal 22 and the cord 38.

Next, the operation of the thus configured in-tank pump for an internal combustion engine will be described.

When the electric motor M is driven to rotate by the supply of the battery power, the impeller 9 rotates, and the fuel in the fuel tank 2 is introduced into the pump chamber 39 via the filter 32. Further, the fuel from the pump chamber 39 is supplied to the fuel passage 40, the check valve 21,
It is supplied to the internal combustion engine via the connection member 31 and the discharge pipe 30.

At this time, when the electric motor M is driven, the armature 11
Rotates and generates vibration. This vibration propagates through bearing 20 and bearing 10. That is, the power is transmitted from the bearing 20 to the housing 3 via the bearing holder 17, further transmitted from the housing 3 to the frame end 18, and reaches the fuel tank 2 via the connecting member 31 and the discharge pipe 30. On the other hand, the vibration from the bearing 10 is transmitted from the pump chamber forming member 7 to the housing 3, further transmitted from the housing 3 to the frame end 18, and the connection member 31 and the discharge pipe
After 30 the fuel tank 2 is reached. Thus, the fuel tank 2 tends to vibrate.

At this time, since the frame end 18 is firmly attached to the housing 3 with the vibration damping member 23 interposed therebetween, the vibration of the housing 3 is attenuated, the vibration of the frame end 18 is reduced, and the fuel vibrating through the discharge pipe 30 Tank 2
Vibration also becomes smaller. As a result, the low-frequency sound due to the vibration of the fuel tank 2 that can be heard in the vehicle interior is reduced.

As described above, in this embodiment, one end is fixed to the housing 3 by swaging, and the other end is connected to the fuel tank 2 at the frame end 18 and the fuel passage forming member), and the vibration damping member 23 for damping vibration is interposed. Then, it was swaged with the housing 3. As a result, the vibration generated due to the driving of the electric motor M tends to propagate from the housing 3 to the fuel tank 2 through the frame end 18, but the vibration is attenuated by the vibration damping member 23 and the noise in the fuel tank 2 is reduced. Generation is suppressed. Therefore, the noise from the fuel tank 2 due to the vibration of the pump can be suppressed.

Note that the present invention is not limited to the above embodiment. For example, in the above embodiment, the vibration damping member 23 uses an O-ring made of a rubber material, but may be a vibration damping steel plate or the like.
As shown in FIG. 3, the vibration damping member 23 is connected to the entire contact portion between the bearing holder 17 and the frame end 18 and the housing 3
And the frame end 18 may be disposed at all contact portions.

Further, as shown in FIG. 4, the vibration damping member 23 may be provided at a part of a contact portion between the bearing holder 17 and the frame end 18 and at a whole contact portion between the housing 3 and the frame end 18.

〔The invention's effect〕

As described above in detail, according to the present invention, an excellent effect of suppressing noise caused by vibration of the pump is exhibited.

[Brief description of the drawings]

FIG. 1 is a sectional view of an in-tank pump for an internal combustion engine according to an embodiment, FIG. 2 is a view showing a state in which the in-tank pump is mounted in a fuel tank, and FIG. FIG. 4 is a sectional view of another in-tank pump for an internal combustion engine of another example. 2 is a fuel tank, 3 is a housing, 18 is a frame end as a fuel passage forming member, 23 is a vibration damping member, and M is an electric motor.

Claims (3)

(57) [Claims] An electric motor comprises: a housing for accommodating an electric motor; and a fuel passage forming member having one end fixed to the housing by caulking and having a fuel passage formed at the other end. For supplying fuel to the internal combustion engine through the fuel passage forming member, wherein the fuel passage forming member is assembled with the housing with a vibration damping member for damping vibration interposed. Engine fuel pump. 2. The fuel pump according to claim 1, wherein the fuel pump is mounted in a fuel tank. 3. The fuel pump according to claim 1, wherein the housing and the fuel passage member are caulked.