JPH04116260A - Motor-driven fuel feeder - Google Patents

Abstract

PURPOSE:To separate a connecting lead wire between an electronic control element and the magnetic field winding of a stator from fuel together with the stator and the magnetic field winding by providing a bulkhead body partitioning the inside of a housing into a rotor chamber and a stator chamber respectively. CONSTITUTION:A bulkhead body 60 is made of a stainless steel plate, the circular base end section 61a of an outside cylinder 61 is fixed and supported liquid- tightly by welding on the outer periphery of the surface of a support substrate 50, it is coaxially extended in a housing 10, and the inside of the housing 10 is partitioned into a stator chamber S and a rotor chamber R. When a motor M rotates a rotor 90 by the control of an electronic control element E, an impeller 110 is rotated, and fuel is sucked into a pump chamber 42 through a suction hole 41 and discharged through a discharge hole 11. A stator 70, a magnetic field winding 71, a connecting lead wire 72 and the electronic control element E are separated from the contact with the flowing fuel by the bulkhead body 60, thus the rust of the stator 70 and the electric corrosion of the magnetic field winding 71 and a connecting lead wire 72 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a fuel supply device, and particularly to an electric fuel supply device suitable for use in vehicles and the like.

(Prior Art) Conventionally, for example, in an electric fuel supply device for a vehicle,
There is one in which the pump is assembled coaxially with the rotor of the motor within the housing of the motor.

(Problem to be Solved by the Invention) By the way, in such a configuration, for example, a motor rotation speed control device as disclosed in Japanese Patent Application Laid-Open No. 57-68530 is installed in the nozzling of the motor. However, in such a case, the connecting conductor between the rotation speed control device and the stator winding of the motor and the stator winding would be constantly exposed to the fuel flowing inside the motor housing. That will happen. For this reason, the above-mentioned connecting conductor wires and stator windings are electrolytically corroded due to contact with the fuel, which causes a decrease in reliability. There was also the problem that the stator rusted due to contact with the fuel. The above-mentioned problems were particularly noticeable when gasohol fuel was used as the fuel.

Therefore, in order to cope with the above-mentioned problems, the present invention provides a connection conductor between an electric control element disposed in the nozzing of the motor and the field winding of the stator in an electric fuel supply device. The idea is to isolate the stator and its field windings from the fuel.

(Means for Solving the Problems) In solving the above problems, the present invention includes a cylindrical housing and an end bracket, which is an example of this housing, from the outer periphery of a disk attached to the inner side of the end bracket to the inner periphery of the housing. An outer cylinder that extends liquid-tightly along the surface, and an inner cylinder that is folded inward from the tip of the outer cylinder and extends toward the disk, are formed integrally and coaxially from a stainless steel plate, Coaxial partitions are formed on the inside and outside of the inner cylinder, partitioning the inside of the housing into a rotor chamber and a stator chamber, respectively, and an inner circumferential surface of the outer cylinder and an outer circumferential surface of the inner cylinder are provided. a stator held between the stator, an electric control element fixed to the disk in the stator chamber and connected to the field winding of the stator via a connecting conductor, and rotatable within the inner cylinder through a gap. and between the coaxially supported rotor, the inner circumferential surface of the housing, the outer circumferential surface of the outer cylinder, and the outer circumferential portion of the disk, and between this disk and the one end bracket. a motor comprising a communication passage formed to communicate a discharge hole of an elastomer with the rotor chamber;
The motor is coaxially assembled to the motor via the other side end bracket, and as the rotor rotates, fuel is sucked in and discharged through the rotor chamber, the communication passage, and the discharge hole.

(Operation and Effect) By configuring the present invention as described above, when the motor rotates the rotor under the control of the electric control element, the pump sucks fuel and the rotor chamber and the communication It is discharged through the passage and the discharge hole. In such a case, as mentioned above, the stator in the stator chamber, its field winding,
Since the connecting conductor between the field winding and the electric control element is reliably isolated from the fuel by the partition, rust on the stator and electrolytic corrosion of the field winding and the connecting conductor are prevented from occurring. can be prevented.

(Embodiment) Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an example of an electric fuel supply device for a vehicle to which the present invention is applied, and this fuel supply device is a brushless fuel supply device. A DC motor M and a circumferential flow pump P are coaxially and integrally assembled, and an electronic control element E of the DC motor M is attached inside the DC motor M. The DC motor M has a cylindrical housing 10, and an end bracket 20 is provided at one end of the housing 10.
are fitted coaxially, and on the other hand, an end bracket 30 that also serves as an example of a housing member of the pump P is attached to the other end of the housing lO.
It is fitted coaxially with 0. Connection terminal 21
is press-fitted into the small diameter part of the stepped hole 22 of the end bracket 20, and this connection terminal 21 is
It plays the role of connecting an external DC power source to the electronic control element E.

In addition, in FIG. 1, the reference numeral 22 indicates the end bracket 20.
A fuel discharge hole formed in is shown, and the reference numeral 23 indicates a relief valve.

The support substrate 50 is formed of a stainless steel plate into a substantially disk shape, and the outer peripheral surface of the support substrate 5o is brought into contact with the inner wall portion of one end of the housing 10, and the lower back surface thereof is brought into contact with the inner wall portion of one end of the housing 1O. Inner wall lower part 23a of end bracket 20
At the same time, the annular boss 51 at the bottom of the back surface is coaxially fitted into the large diameter part of the stepped hole 220 of the end bracket 20 through the O-ring 52, and assembled parallel to the inner wall of the end bracket 20. It is attached. However, the upper part of the back surface of the support board 50 and the upper part of the inner wall 23 of the end bracket 20
A cavity for forming a communication path A to the inner end of the discharge hole 22 is formed between the lower part 2 of the inner wall of the end bracket 20 and
3a is formed to protrude inward of the housing 10 from the inner wall upper part 23b.

The partition body 60 is integrally formed by deep drawing from a stainless steel plate with a thickness of about 0.5 (mm) so that it has a double cylindrical structure with the cross-sectional shape shown in FIG. The partition body 60 has an annular base end 6 of its outer cylinder 61.
1a is fixed and supported in a liquid-tight manner by welding to the outer periphery of the surface of the support substrate 50, and extends coaxially within the housing 10, and the interior of the housing 10 is divided into a stator chamber S and a rotor chamber R. There is. In such a case, the first part of the outer cylinder 61
In the drawing, a communication passage B having a rectangular cross section is provided between a recess 61b having a 0-shaped cross section formed along the axial direction in the upper part of the figure and the peripheral wall portion of the housing lO that faces the recess 61b. One end B1 of this communication path B communicates with the inside of the rotor chamber R, while the other end B2 of the communication path B communicates with the outer peripheral surface of the support substrate 50 at the upper side in FIG. A recess 5 with a U-shaped cross section is bored corresponding to the width of the communication path B.
3 and communicates with the upper end of the communication path A. Note that the recess 61b of the outer cylinder 61 is excluded (the part is the housing 10
uniformly in contact with.

As shown in FIG. 1, the stator 70 is coaxially sandwiched between an outer cylinder 61 and an inner cylinder 62 of the partition body 60 in the stator chamber S, and has a field wound around the stator 70. The magnetic winding 71 is mounted on the support substrate 5 in the stator chamber S.
A connecting conductor 72 is connected to the output terminal of the electronic control element E fixed at 0.
connected via. In addition, the input terminal of the electronic control element E is connected to the connection terminal 2 in the through hole 54 of the support substrate 50.
A conductive port extending from the inner end of 1 is connected to door 21a.

The rotor shaft 80 is fitted at its base end 81 into the center of the housing member 40, and the rotor shaft 80 is attached to the inner cylinder 6 of the partition wall 60 in the rotor chamber R.
2 and extends coaxially through an annular boss 31 of an end bracket 30. Further, the rotor shaft 8o has its tip 82 coaxially fitted into the central annular boss portion 3a of the annular receiving member 83, which is coaxially fitted into the bottom 62a of the inner cylinder 62. .

The rotor 90 has an inner cylinder 62 in its central hollow part 91.
Each bearing 92 is installed at the intermediate portion of the rotor shaft 80 in the
The rotor 9o has a cylindrical magnet 93 coaxially fitted around the outer periphery of a cylindrical yoke 93, and the magnet 9
4 are covered with respective synthetic resin members 94a, 94a. However, a predetermined interval is uniformly provided between the outer peripheral surface of the rotor 90 and the inner peripheral surface of the inner cylinder 62. In addition, the code|symbol 95 shows an annular collar, and the code|symbol 96 shows a stop ring.

The annular member 100 is loosely fitted into the boss 31 of the end bracket 30 so that its shaft hole 101 is coaxially fitted into the intermediate portion of the rotor shaft 81. A connecting portion (i3a) extending from one side outer peripheral edge of the yoke 93 of the rotor 90 is inserted and connected to the connecting groove portion 102 formed in the connecting groove 102. As a result, the annular member 100 rotates integrally with the rotor 90. The annular member 100 has one end in contact with the inner shaft of the bearing 192a through an annular collar 103, and the other end in contact with a stop ring 98 through an annular collar 97 to be prevented from coming off.

The pump P has an impeller 110, and the annular boss 111 of the impeller 110 is rotatably fitted to the base end 81 of the rotor shaft 80 between the housing member 40 and the end bracket 30. Assembled coaxially. Further, the impeller 110 has the annular member 10 inserted into the connecting hole 1118 bored on the outer periphery of the boss 111.
It is connected to the annular member 100 so as to be integrally rotatable by engaging a connecting portion 104 extending from the outer circumference of the ring member 100 .

Accordingly, this pump P sucks fuel into the pump chamber 42 through the suction hole 41 of the housing member 40 in accordance with the rotation of the impeller 110, and transfers this suction fuel to the end bracket 300 communication hole (not shown), the rotor The chamber R1 is discharged through both communication passages B and A, the recess 53 of the support substrate 50, and the discharge hole 22.

In the first embodiment configured in this manner, when the motor M rotates the rotor 90 under the control of the electronic control element E, the impeller 110 of the pump P rotates the annular member 100 as the rotor 90 rotates. It rotates in accordance with the rotation and sucks fuel into the pump chamber 42 through the suction hole 41 of the housing member 40. Thus, the pump P transfers the intake fuel in the pump chamber 42 to the communication hole of the end bracket 30 and the rotor chamber R1.
Communication path B, recess 53 of disk 50, communication path A, and discharge hole 2
Discharge through 2.

In such a case, the stator 70 and field winding 7 in the stator chamber S
1. Since the connecting conductor 72 and the electronic control element E are isolated from contact with the above-mentioned fluidized fuel by the partition 60, rust on the stator 70 that is expected to occur due to contact with the fuel is prevented. Electrolytic corrosion of the field winding 71 and the connecting wire 72 can be prevented in advance and reliably.

FIG. 2 shows a second embodiment of the vehicle fuel supply system according to the present invention. This fuel supply device vertically supports a motor pump Mp on a bladder 122 that hangs down from a lid plate 121 in a fuel tank 120 of the vehicle, and also supports a motor pump Mp vertically on a bladder 122 that hangs down from a lid plate 121 of the fuel tank 120 of the vehicle. A duty control element 130 is assembled via a holder 123 made of synthetic resin, and this duty control element 130 is
The output terminal of the motor pump Mp is connected to the field winding of the motor in the motor pump Mp via a connecting wire. However, the caning 131 of the duty control element 130 is formed of a stainless steel plate or the like. In addition, in FIG. 2, the symbol H indicates the fuel discharge path of the motor pump Mp.
Further, each reference numeral 132 indicates an external connection lead wire to the duty control element 130.

Therefore, in the second embodiment configured as described above, the number of connecting conductors is smaller than in the case where the duty control element 130 is disposed outside the fuel tank 120 as in the conventional case.
Since the length is significantly shortened, the influence of switching noise on the connecting conductor based on duty control is reduced (as shown in FIG. 4) compared to the conventional fluctuation characteristics due to switching noise as shown in FIG. In such a case, instead of the connecting conductor wire, a narrow metal conductive plate may be employed, and this metal conductive plate may be covered within an additional portion additionally formed on the holder 123. The inside of the motor Mp is configured in the same manner as the inside of the motor M described in the first embodiment, and the duty control element 1 is used as the electronic control element E.
If No. 30 is adopted, not only the above-mentioned switching noise can be reduced, but also the same effects as in the first embodiment can be achieved.

In implementing the present invention, the fuel supply device described in the first embodiment is not limited to vehicles, and may be applied to, for example, the supply of fuel for general household use.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a first embodiment of the present invention, Fig. 2 is a partially cutaway sectional view showing a second embodiment of the invention, and Fig. 3 is a variation of conventional switch-notching noise according to frequency ζ. Graphs showing the characteristics and FIG. 4 are graphs showing the stable characteristics according to the frequency of the switching noise in the second embodiment. Description of symbols 10...Housing, 20.30...End bracket, 22...Discharge hole, 50...Disc, 5
3... Recess, 60... Partition body, 61... Outer cylinder, 62... Inner cylinder, 70... Stator, 71...
・Field winding, 72... Connection conductor, 90 ・ ・ ・
Rotor, A, B...Communication path, M...Motor, P...Pump, R...Rotor chamber, S...
・Stator room.

Claims (1)

[Claims] A cylindrical housing, an outer cylinder extending liquid-tightly along the inner circumferential surface of the housing from the outer circumference of a disk attached to the inner side of the end bracket on one side of the housing, and an outer cylinder extending from the tip of the outer cylinder to the outer circumference of the disk. An inner cylinder that is folded inward and extends toward the disk is integrally and coaxially formed of a stainless steel plate, and the inside of the housing is connected to a rotor chamber on the inside and outside of the inner cylinder. a partition wall defining a stator chamber; a stator coaxially sandwiched between the inner circumferential surface of the outer cylinder and the outer circumferential surface of the inner cylinder; an electric control element connected to the field winding of the stator via a connecting conductor; a rotor rotatably and coaxially supported within the inner cylinder through an air gap; and an inner peripheral surface of the housing and the outer side. a communication path formed between the outer circumferential surface of the cylinder and the outer circumference of the disc and between the disc and the one end bracket so as to communicate the discharge hole of the one end bracket into the rotor chamber; a motor, and a pump that is coaxially assembled to the motor via an end bracket on the other side and that sucks in fuel as the rotor rotates and discharges it through the rotor chamber, the communication passage, and the discharge hole. An electric fuel supply device.