JP3289300B2 - Vehicle fuel supply system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply device for a vehicle installed in a fuel tank, and has a structure for connecting a power supply terminal provided on an end cover to a lead end of a stator coil. It is a simple and reliable corrosion-resistant insulating treatment.

[0002]

2. Description of the Related Art A brushless motor for facilitating connection between a lead end of a stator coil and an external connection terminal is disclosed in Japanese Utility Model Laid-Open No. 2-118471. The brushless motor draws out a lead wire of the stator coil from a lead hole of the first bracket, inserts the lead wire into a housing, solders the lead wire to an external connection terminal, and then attaches the second bracket to the housing. The external connection terminal is inserted and held.

[0003]

However, in the brushless motor having the above-mentioned structure, if the fuel seal between the first bracket and the second bracket is not securely performed, the fuel penetrates from the draw-out hole and the lead-out line is connected to the external connection. There is a risk that the connection portion with the terminal may be electrolytically eroded, and there is a problem that reliability for installation in the fuel tank is lacking. Also, the first
In addition, the second bracket has problems in that the torque around the screw acts, so that the manufacturing accuracy and the assembling accuracy need to be improved, and the press-fitting strength into the housing needs to be increased. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has a simple structure for connecting a power supply terminal provided on an end cover to a lead end of a stator coil and the like, and has a corrosion-resistant insulation. It is an object of the present invention to provide a vehicular fuel supply device capable of performing processing reliably.

[0004]

As a specific means for solving the above-mentioned problems, a rotor, a plurality of stator coils installed around the rotor, and an energization to the stator coil are provided. A control circuit for controlling and a pump unit driven by the rotor are built in the housing, and an end cover provided with a fuel passage, a fuel discharge port communicating with the fuel passage, and a terminal for power supply is provided. In a vehicle fuel supply device having an opening closed, the end cover is provided.
The surface exposed to the outside of the housing in
And the inner side of the housing in the end cover
When the surface located at the back is the back surface,
Working hole that penetrates up to
The other end is filled with a resin that communicates with the working hole on the back side.
A hole is formed in the end cover and connected to the working hole.
A wire terminal plate is provided, and the power supply is connected to the connection terminal plate.
Supply terminal is connected to the connection terminal plate.
Connection of the draw-out end of the stator coil or the control circuit
Terminals are connected, and a tree is inserted into the working hole and the resin injection hole.
A fuel supply device for a vehicle characterized by being filled with fat is provided.

[0005]

According to the above fuel supply device for a vehicle, the connection between the drawing end of the stator coil or the connection terminal of the control circuit and the connection terminal plate is performed in the working hole of the end cover fitted to the housing. A resin material is injected into the working hole to perform resin sealing, and an insulation treatment for resistance to electric corrosion is performed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) The structure of a vehicle fuel pump 1 to which the present invention is applied will be described below with reference to the sectional view of FIG. FIG. 1 is a sectional view taken along line AA in FIG. In the cylindrical housing 10 of the vehicle fuel pump 1, a discharge portion 90 is provided at an upper end portion 11, and a motor portion 50 is provided at a thick central portion 12.
However, a pump unit 30 is provided at the lower end 13.
The pump unit 30 includes a pump casing 31, a pump cover 32, and an impeller 33.

[0007] The pump casing 31 is
Are fitted into the central portion 12 of the housing 10 from the lower end without any gap. The pump cover 32 is press-fitted from the lower end side of the housing 10. The pump casing 31 and the pump cover 32 are prevented from rotating by the protrusion 14 of the housing 10. A pump chamber 34 as a regeneration pump is formed between the pump casing 31 and the pump cover 32. The area around the pump chamber 34 is the pump cover 3.
The housing 2 is sealed by being pressed toward the central part 12 by the caulking part 15 of the housing 10. A shaft 51 is press-fitted and held in the pump cover 32, and a suction port 35 communicating with a suction side position of the pump chamber 34 is formed. An impeller 33 of the regenerative pump is rotatably housed between the pump casing 31 and the pump cover 32, and a shaft 51 penetrates the impeller 33. The pump casing 31 includes a discharge side position of the pump chamber 34 and the housing 10.
An unillustrated discharge port communicating with the inside is formed.

The motor section 50 includes a rotor 60 rotatably supported by a shaft 51 and a stator section 70 integrally formed of a resin material. The shaft 51 has two grooves 52, 53 formed therein.
A C-ring is fitted into 53. The shaft 51 includes three washers and a joint 5 from the groove 52 side.
Four and one washer, rotor 60, and three washers are inserted and rotatably supported. Joint 5
4 has a claw 55 inserted into a joint hole 36 formed in the impeller 33, and rotates together with the impeller 33. Note that the joint 54 has another claw (not shown) positioned so as to narrow the shaft 51, and this claw is also used for the impeller 33.
Is inserted into another joint hole (not shown) formed at the bottom.

The rotor 60 has a cylindrical yoke 61 made of electromagnetic stainless steel. The yoke 61 has a claw 62 inserted into a joint groove 56 formed in the joint 54, and rotates together with the joint 54. The yoke 6
1 has another claw portion (not shown) positioned narrowing the shaft 51, and this claw portion is also inserted into another joint groove (not shown) formed in the joint 54. Around the yoke 61, four ferrite magnets 63 are adhered with an epoxy adhesive, and stainless steel plate rings 64, 65 are press-fitted at both ends. Carbon metals 66 and 67 are press-fitted into the inner peripheral surfaces of both ends of the yoke 61. The ferrite magnet 63 and the plate rings 64 and 65 are molded with the PPS resin 68, and the space between the four ferrite magnets 63 is filled. The plate rings 64 and 65 have a diameter of 0.5 to 2.
0 mm holes are drilled as appropriate.

[0010] The stator 70 is formed of an epoxy resin material 71 containing 20% of glass into a substantially cylindrical shape with a bottom. Then, the bottom surface is set to the upper end side of the housing 10 and the opening 11 of the upper end portion 11 of the housing 10 is formed.
From a, it is fitted into the central portion 12 of the housing 10 without any gap, and is prevented from rotating by a projection 16 formed on the housing 10. The stator unit 70 has a built-in three-phase stator in a surrounding side wall, and a control circuit unit is installed on a bottom wall thereof. The stator has a stator core 72 and three-phase stator coils 73 wound around the stator core 72, and copper wires at both ends of each phase of the stator coil extend to the control circuit unit. The control circuit section has a container 76 composed of a stainless steel circular plate 74 and a stainless steel dome-shaped cover 75, and a control circuit 77
Is installed. The circular plate 74 is connected to the control circuit 77.
Is exposed to a fuel passage 92 to be described later. Note that the circular plate 74 and the dome-shaped cover 75 may be made of a nickel-plated iron plate. Also,
The control circuit 77 is insert-molded in resin,
After resin molding, it may be press-fitted from above in FIG. 1 and installed on the bottom wall.

Further, on the inside of the bottom surface of the stator 70,
A hole 82 for receiving the shaft 51 is formed. Upper end 1 of housing 10 from the inside of the bottom surface of stator 70
On one side, a fuel passage 83 is formed avoiding the container 76. As a result, the fuel discharged into the housing 10 by the pump unit 30 passes through the periphery of the rotor 60 and radially escapes from the inside of the stator unit 70, and passes between the groove formed in the stator unit 70 and the housing 10. As a result, it flows out toward the upper end 11 of the housing 10.

The discharge section 90 is provided at the upper end 1 of the housing 10.
1 has an end cover 91 press-fitted therein. The end cover 91 is an integrally molded product made of a resin mold. The end cover 91 is pressed toward the central portion 12 of the housing 10 by the caulking portion 17 of the housing 10 and the circular plate 7 of the control circuit portion.
4 abuts.

FIG. 2 shows the structure of the end cover 91.
This will be described in detail with reference to FIG. In the end cover 91, a fuel passage 92 communicating with the fuel passage 83 is formed, and a discharge port 93 and a relief valve 94 communicating with the fuel passage 92 are formed. A check valve 96 is provided at the discharge port 93.
Is provided. The end cover 91 has terminals 80 and 81 for power supply and terminal plates 95 a to 9 for connection.
5e is embedded by resin molding. The terminal 80 is connected to the connection terminal plate 95e, and the terminal 81 is connected to the connection terminal plate 95a. The connection terminals 78a of the control circuit 77 are connected to the connection terminal plates 95a to 95e.
And 78 e and pulled out from both ends of the three-phase stator coil 73, passed through the stator 70, and passed through the end cover 91.
Work holes 97a-97e for connecting the copper wires 86a-86f led near the terminal board by soldering or the like are formed in a penetrating manner corresponding to the connection terminal plates 95a-95e.
The working holes 97a to 97e are provided with tapered walls 9 as shown in FIG.
8 are provided, and the hole shape is enlarged toward the back surface of the end cover 91.

Further, on the back surface of the end cover 91, a ridge 99a surrounding the working hole 97a and working holes 97b to 97b are provided.
A ridge 99b surrounding 7e is formed. And
A resin injection hole 100 facing the inside of the ridges 99a and 99b,
101 is formed from the surface of the end cover 91. FIG.
As shown in FIG. 5, the resin injection hole 100 and the working hole 97a communicate with each other through a communication recess 102 provided on the back surface of the end cover 91, and the resin injection hole 101 communicates with the working holes 97b to 97e in a common manner through the communication recess 103. ing.

The ridges 99a and 99b are fixed to the central portion 1 of the housing 10 by the caulking portion 17 of the end cover 91.
When it is pressed and fitted toward 2, it is pressed into contact with a circular plate 74 that seals the stator unit 70 and the control circuit unit, and is deformed and adhered. Thus, a strong sealing property is ensured, and even if the potting resin having good fluidity is injected, the potting resin does not leak into the fuel passage 92.

In a state where the end cover 91 is crimped to the housing 10, the connection terminal plate 95a connected to the terminal 81 and the connection terminal 78a of the control circuit 77 are connected in the work hole 97a. In the terminal 97b, the connection terminal 78b and the copper wires 86a drawn from both ends of the three-phase stator coil 73 are connected to a connection terminal plate 95b. In the working hole 97c, a connection terminal plate 95c is provided.
The connection terminal 78c and the copper wire 86b are connected to the
d, the connection terminal 78d and the copper wire 8 are connected to the connection terminal plate 95d.
6c, and in the working hole 97e, a connection terminal 78e is connected to a connection terminal plate 95e connected to the terminal 80.
And the copper wires 86d, 86e and 86f.

When the connection work is completed, the resin injection hole 1
The injection of the potting resin 104 is started from 00 and 101. The potting resin 104 injected from the resin injection hole 100 is filled from below the work hole 97a through the communication recess 102. The potting resin 105 injected from the resin injection hole 101 is filled from below the working holes 97b to 97e through the communication recess 103. The filled potting resins 104 and 105 are cooled and solidified to seal the working holes 97a and 97b to 97e with resin.

Next, the operation of the above embodiment will be described with reference to the circuit diagram of the control circuit 77 in FIG. In actual use, a filter (not shown) is provided at the suction port 35, a pipe (not shown) connected to the fuel injection device of the vehicle is connected to the suction port 93, and the entire fuel pipe for the vehicle is fueled by an appropriate stay. Held in the tank. The control circuit 77 includes power MOS-FETs 77 a, 77 b, 77 for interrupting the energization of the U, V, and W phases of the stator coil 73, respectively.
c and these MOS-FETs 77a, 77b, 77c
And a drive circuit 77d for controlling the operation of the drive circuit.

When power is applied to terminals 80 and 81, drive circuit 77d drives MOS-FETs 77a, 77b,
77c are sequentially turned on with a predetermined overlap time to excite the stator coils 73 of each phase. This three-phase half-wave drive causes the rotor 60 to rotate and the impeller 33 to rotate. Then, by the rotation of the impeller 33, the fuel is sucked through the suction port 35, passes through the housing 10, and is discharged from the discharge port 93 through the fuel passages 83 and 92.

The potting resin 103, 104 of the resin sealing portion according to the above embodiment is provided with the working holes 97a and 97b to 9b.
Since it is injected from below 7e, it is possible to minimize the accumulation of air due to poor air release. Further, since the working holes 97a to 97e are formed so as to expand toward the back surface of the end cover 91 by the tapered wall 98, it is possible to prevent the pressurized fuel from leaking from the potting resin filling portion or to prevent the potting resin from peeling and falling off. You. In addition, prevention of the dropping of the potting resin can be realized by a simple step, a protrusion or a recess.

The connection terminal plates 95a to 95e of the above embodiment.
Are inserted at the time of molding the end cover 91 with the molding resin, but the connection terminal plates 95b to 9
5d is heat caulked to fixing ribs 106b to 106d integrally formed on the end cover 91 so as to cross the corresponding working holes 97b to 97d at the center in the depth direction.
7d can be fixed by retrofitting (FIG. 6,
(FIG. 7). Thereby, since it is not necessary to insert the connection terminal plates 95b to 95d, the structure of the mold of the end cover 91 is simplified.

(Second Embodiment) FIG. 8 shows the configuration of a vehicle fuel pump 1 according to a second embodiment. The same parts as those in the first embodiment, such as the pump section 30, and the like, and the parts having substantially no functional differences are denoted by the same reference numerals, and detailed description thereof will be omitted. In the second embodiment, the outer cylindrical portion 20
Using a stainless steel container 200 in which an inner cylindrical portion 202 is squeezed into one and integrally formed, the entire stator portion 70 is inserted into an annular insertion portion 203 between the outer cylindrical portion 201 and the inner cylindrical portion 202, and control is performed. The part is oil-tightly sealed by a stainless steel cover plate 204 provided on the inner surface. Then, the stainless steel container 200 is fitted to the housing 10, and the shaft 51 is supported by a bearing 205 provided in the inner cylindrical portion 202, and the rotor 60 is connected to the inner cylindrical portion 202.
Rotate within.

Since the electrical connection between the stator coil 73 and the control circuit 77 is performed in the stainless steel container 200, it is not necessary to take measures against electric corrosion. However, the connection terminal plate 1 connected to the power supply terminals 80, 81
95a, 195b and connection terminals 178a,
It is necessary to take a countermeasure against electric corrosion in the connection portion with 178b as in the case of the first embodiment. For this reason, working holes 197a and 197b for connection are provided on the end cover 191 into which the terminals 80 and 81 and the connection terminal plates 195a and 195b are inserted, by the connection terminals 178a and 178.
It is formed so as to correspond to the connection portion with b (FIG. 9). After the end cover 191 is crimped to the housing 10, the connection terminal plates 195a, 195b and the connection terminals 178a, 178 are connected.
As in the case of the first embodiment, the connection of 8b is performed, and the potting resins 204 and 205 are injected and filled to perform resin sealing.

In the second embodiment, since there are two connection portions, the connection operation time can be reduced. The working hole 19
7a and 197b can be made large and can be connected by welding or the like, thereby improving productivity.

[0025]

The fuel supply system for a vehicle according to the present invention is described above.
Because of the configuration, the end cover
Pull-out end of stator coil or control circuit in working hole
Can be connected between the connection terminal and the connection terminal plate.
Therefore, the configuration for connection is simple and costly.
There is no. Also, the working holes can be sealed with resin after connection.
Make sure that the corrosion-resistant insulation treatment is
Can be. In addition, one end of the resin injection hole is opened on the surface
And the other end communicates with the working hole on the back side.
Inject resin material into resin injection hole from outside of the housing
And the resin material from the back side of the working hole through the resin injection hole
After inflow, filling is performed in order toward the surface side of the work hole.
You. In this way, the resin material flows from the back side of the working hole.
The air vent inside the working hole is
From the air, and minimize air traps due to poor air bleeding.
It can be less powerful. And many air pockets
In some cases, the air in the air pool changes as ambient temperature changes.
Expands or contracts to stress the resin layer,
The stress causes cracks in the resin layer,
Fuel may enter the connection via the
According to the lighting device, it is possible to minimize air pools.
To prevent the occurrence of cracks and to prevent electrical corrosion
Performance can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along line AA of FIG. 2 of a vehicle fuel pump according to a first embodiment of the present invention.

FIG. 2 is a plan view of the vehicle fuel pump according to the first embodiment to which the present invention is applied.

FIG. 3 is a sectional view taken along line BB in FIG. 1 before resin injection.

FIG. 4 is an enlarged sectional view of a main part.

FIG. 5 is a circuit diagram of a control circuit.

FIG. 6 is a view showing a modification of the end cover shown in FIG.
It is a C line sectional view.

FIG. 7 is a rear view showing a modification of the end cover.

FIG. 8 is a partially cutaway front view of a vehicle fuel pump according to a second embodiment to which the present invention is applied.

FIG. 9 is a partially cutaway plan view of a vehicle fuel pump according to a second embodiment to which the present invention is applied.

[Explanation of symbols]

1 .... Vehicle fuel supply pump 11a ... Opening 30 ...
Pump part 33 ... Impeller 50 ... Motor part 6
0 ... rotor 70 ... stator part 72 ... stator core 73 ... stator coil 77 ... control circuit 80,
81 ... Terminals 86a-86f ... Copper wire 91,191 ... End cover 93 ... Discharge ports 95a-95e, 195a, 195
b ... Connection terminal board 97a-97e, 197a, 19
7b ... Work hole 98 ... Taper wall 99a, 99b ...
Protrusions 104, 105, 204, 205 ... potting resin.

Claims (3)

(57) [Claims] 1. A rotor, a plurality of stator coils installed around the rotor, a control circuit for controlling energization of the stator coils, and a pump unit driven by the rotor. built in the housing, the fuel discharge port and the vehicle fuel supply device comprising block the opening of the housing by an end cover provided with terminals for power supply that communicates with the fuel passage and the fuel passage, the in the end cover Exposed outside of housing
The surface of the end cover
When the surface located inside the jing is the back surface,
A working hole penetrating from the surface to the back surface,
And the other end communicates with the working hole on the back side.
A resin injection hole is formed in the end cover, a connection terminal plate is disposed in the work hole, and the power supply terminal is connected to the connection terminal plate.
And the end of the stator coil is connected to the connection terminal plate.
Or the connection terminal of the control circuit is connected, and the working hole and the resin injection hole are filled with resin.
Vehicular fuel supply apparatus characterized by that. 2. The fuel supply device for a vehicle according to claim 1, wherein a ridge surrounding the work hole is formed on a contact surface of the end cover in the housing. 3. The vehicle fuel supply device according to claim 1, wherein a stopper is formed in the work hole so that the resin does not fall out of the work hole due to a fuel discharge pressure.