JPH0137180Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention is an in-tank device for pulling out the lead wire of an electric motor for driving a fuel pump disposed inside a fuel tank in a vehicle internal combustion engine to the outside of the fuel tank. This invention relates to a lead wire drawing structure for a type fuel pump.

<Prior art> In recent years, in internal combustion engines for vehicles,
As seen in Japanese Patent No. 110373, etc., there is a fuel tank in which a fuel pump is provided for supplying fuel in the tank to a carburetor, a fuel injection valve, or the like.

In this type of in-tank fuel pump, a lead wire of an electric motor for driving the fuel pump is led out of the fuel tank by a lead wire drawing structure as shown in FIGS. 3 and 4, for example.

To explain this, a hole 2 is formed in the top plate 1 of the fuel tank. Then, an insulating block 5 is provided by molding a connection part between a lead wire 3 connected to a power supply circuit (not shown) outside the fuel tank and a conductive pin 4 connected thereto with resin such as polyacetal. The fitting portion 5a of the insulating block 5 on the protruding side of the pin 4 is fitted into the hole 2 of the upper plate 1 from the outside of the fuel tank, so that the protruding portion of the pin 4 faces into the fuel tank.
Note that a sheet 6 made of NBR is interposed between the outer surface of the upper plate 1 and the insulating block 5. Then, attach the NBR to the protruding part of pin 4 from inside the fuel tank.
At the same time, the outer periphery of the insulating ring 7 is covered with an insulating cover 8 made of resin such as polyacetal, and the protruding part of the pin 4 is further covered with a conductive terminal plate 9 having a hole in the center. The terminal plate 9 and the like are fixed by enlarging the hole formed in the end face of the protrusion 4 with a punch and crimping the entire circumference as shown in the figure 10. A lead wire 11 of an electric motor (not shown) is soldered to the bent portion 9a at the end of the terminal plate 9.

<Problems to be solved by the invention> However, in such a conventional lead wire pull-out structure, the terminal plate 9 etc. were fixed by crimping, which caused problems such as variations in dimensions and crimping force. , a crack (FIG. 4A) may occur in the caulked portion 10 of the pin 4, and this crack may cause the terminal plate 9 etc. to come off due to vibration.

Therefore, the present invention provides a lead wire pull-out structure for an in-tank fuel pump that can securely fix the terminal board, etc. without crimping or increasing the number of parts, and eliminates the risk of the terminal board, etc. falling off. The purpose is to

<Means for Solving the Problems> In order to achieve the above object, the present invention covers the protruding part of the pin facing into the fuel tank with an insulating ring from inside the fuel tank, and then inserts a conductive material that also serves as a terminal plate. A washer is fixed in place by fitting the peripheral edge of the hole formed with elasticity in the center into the circumferential groove formed in the protruding part of the pin, and a part of the outer peripheral edge of this washer is protruded. Terminals for connecting the lead wires of the electric motor are formed by using the terminals.

<Function> In this way, by eliminating caulking and fixing with elasticity using washers, a reliable fixing function is obtained without the risk of cracking, etc., while at the same time, the washer also serves as a terminal board, which prevents an increase in the number of parts. It is to make it.

(Example) An example of the present invention will be described below based on FIGS. 1 and 2. However, the same elements as those in the conventional example are given the same reference numerals and explanations are omitted, and only the different parts will be explained.

A circumferential groove 4a is formed in the protruding portion of the pin 4 embedded in the insulating block 5.

Then, the fitting part 5a of the insulating block 5 is fitted into the hole 2 provided in the upper plate 1, and the protruding part of the pin 4 is exposed into the fuel tank.
The protruding part of the pin 4 is covered with an insulating ring 7 and an insulating cover 8, and a conductive washer 12, which also serves as a terminal plate, is placed in the circumferential groove 4a of the protruding part of the pin 4. The peripheral edge 12a of the hole formed with the same shape is fitted and fixed to prevent it from coming off. At this time, a constant load is applied from the direction of arrow P, and the washer 12 is fitted in this state.
Further, the outer peripheral edge of the washer 12 is bent inside the fuel tank, and a part thereof is extended to form a connection terminal 12b for the lead wire 11 of the electric motor, and the lead wire 11 is soldered thereto. There is.

<Effects of the invention> As explained above, the present invention eliminates caulking and fixes elastically with washers.
Moreover, since this washer also serves as a terminal plate, it is possible to securely fix the terminal plate without causing any cracks, etc., and the number of parts does not increase, which is very useful.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figures are a bottom view of FIG. 1, FIG. 3 is a sectional view showing a conventional example, and FIG. 4 is a bottom view of FIG. 3. DESCRIPTION OF SYMBOLS 1... Upper plate of fuel tank, 3... Lead wire, 4... Pin, 4a... Circumferential groove, 5... Insulating block, 5a... Fitting part, 7... Insulating ring,
DESCRIPTION OF SYMBOLS 11... Electric motor lead wire, 12... Washer that also serves as a terminal plate, 12a... Peripheral hole edge, 12b
...Connection terminal.

Claims (1)

[Scope of utility model registration request] A lead wire connected to a power circuit outside the fuel tank in an in-tank fuel pump lead wire drawing structure for drawing out the lead wire of the electric motor for driving the fuel pump installed inside the fuel tank to the outside of the fuel tank. An insulating block is provided in which the connection part between the insulating block and the conductive pin connected thereto is molded with resin, and the fitting part formed on the protruding side of the pin of this insulating block is inserted into the hole provided in the upper plate of the fuel tank. Fit the pin from the outside of the fuel tank so that the protruding part of the pin faces inside the fuel tank, cover the protruding part of the pin with an insulating ring from the inside of the fuel tank, and then place a washer made of a conductive material in the center of the ring in the radial direction. The peripheral edge of the hole formed with elasticity is fitted into the circumferential groove formed in the protruding part of the pin to prevent it from coming out, and a part of the outer peripheral edge of this washer is protruded to attach the lead of the electric motor. A lead wire drawing structure for an in-tank fuel pump characterized by forming a wire connection terminal.