JPH11159412A - Fuel pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a noise by preventing vibration of the cylindrical part of a receiving side connector by strengthening the cylindrical part of the receiving side connector formed in the synthetic resin motor cover of a fuel pump by a reinforcing means. SOLUTION: A fuel pump has a pump part to increase pressure by sucking fuel and a motor part to drive the pump part. The motor part has a synthetic resin motor cover 4 having a delivery port of the fuel and an electric wiring receiving side connector CS. A cylindrical part 25 of the receiving side connector CS of the motor cover 4 is thickened to a thickness of about two times a thickness of a conventional product. A rear plate part 25c and left and right side plate parts 25d and 25e of the cylindrical part 25 are thickened. A front plate part 25b is thickened only in left and right parts. Thickening of the cylindrical part 25 corresponds to a reinforcing means. Thus, a noise can be reduced by preventing vibration of the cylindrical part 25 of the receiving side connector CS.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-tank type fuel pump mainly used for automobiles.

[0002]

2. Description of the Related Art A conventional example will be described with reference to FIGS. The fuel pump shown in a sectional view in FIG. 8 is an in-tank type installed in a fuel tank of an automobile (not shown), and has a motor unit 1 incorporated in a cylindrical motor housing 3 and a lower part of the motor unit 1. And a pump unit 2 provided on the side.

In the motor section 1, a motor housing 3
A motor cover 4 is attached to the upper end of the motor. A pump cover 5 is attached to the lower end of the motor housing 3. Motor cover 4 and pump cover 5
A motor chamber 6 is formed in an internal space of the motor housing 3 between the motor chamber 6 and the motor chamber 6. A commutator 12 is provided in the motor room 6.
Is disposed. The upper and lower ends of the shaft 8 of the armature 7 are rotatably supported by the motor cover 4 and the pump cover 5 via bearings 9 and 10, respectively. A pair of magnets 11 is fixed to the inner surface of the motor housing 3 in the motor chamber 6.

The armature 7 is mounted on the motor cover 4.
A brush 13 that comes into sliding contact with the commutator 12 is incorporated via a spring 14. The spring 14
The brush 13 is urged in a direction in which the brush 13 is pressed against the commutator 12. A choke coil 15 is electrically connected to the brush 13. The choke coil 15 is electrically connected to a terminal to be described later connected to an external connection terminal (not shown).

The motor cover 4 is provided with a fuel discharge port 16, and the discharge port 16 has a check valve 17.
Is incorporated. The outlet 16 is connected to a fuel supply line leading to a fuel injection valve of an automobile engine (not shown).

In the pump section 2, a pump body 18 is attached to the pump cover 5 by caulking the lower end of the motor housing 3. The pump body 18 is provided with a hollow cylindrical inlet port 19 penetrating in the axial direction. Pump cover 5
Is provided with a hollow cylindrical outlet port 20 penetrating in the axial direction.

Between the pump cover 5 and the pump body 18, there is rotatably disposed a disk-shaped impeller 21 having a large number of blade grooves 22 on the outer peripheral portions on both front and back surfaces. The impeller 21 is connected by fitting with the shaft 8 of the armature 7. The pump cover 5 and the pump body 18 correspond to the blade grooves 22 of the impeller 21 and form a pump flow path 23 extending from the inlet port 19 to the outlet port 20 along the impeller rotation direction.

In the above-described fuel pump, when the motor section 1 is energized to rotate the shaft 8 of the armature 7, the impeller 21 is rotated, so that fuel in a fuel tank (not shown) is sucked from the inlet port 19. . The fuel is pressurized while flowing through the pump flow path 23, enters the motor chamber 6 from the outlet port 20 in the pressurized state, passes through the motor chamber 6, and is discharged from the discharge port 16 of the motor cover 4. You. Note that a conventional fuel pump is disclosed in, for example, Japanese Patent Publication No. 7-62478.

Next, a receiving-side connector for electrical wiring provided on the motor cover 4 (designated by reference numeral CS).
Will be described. The receiving side connector CS is well shown in the perspective view of the motor cover 4 of FIG. 9, the side view of FIG. 10, and the plan view of FIG. FIG. 12 is a sectional view taken along line AA of FIG. 9 to 12,
The motor cover 4 is integrally formed with a substantially rectangular tubular portion 25 projecting from the upper surface thereof. On the bottom surface 25a in the cylindrical portion 25, two left and right terminals 26 project in parallel (see FIG. 12). Each terminal 26
Are electrically connected to the choke coil 15 (see FIG. 8). The terminal 26 and the tubular portion 25 constitute a receiving connector CS.

In FIG. 9, a vertically-long rectangular drainage groove 27 is opened in the front plate portion (reference numeral 25b) of the tubular portion 25 of the receiving connector CS. The portion closing the upper end of the drain groove 27 is a locking portion 28 (see FIG. 12).

In FIG. 11, a central first vertical groove 29 (see FIG. 12) is formed on the inner surface of the front plate portion 25b of the cylindrical portion 25, and vertical walls are respectively provided on the left and right outer sides of the vertical groove 29. Left and right second vertical grooves 30 are located apart from each other, and left and right third vertical grooves 31 are located outside the respective vertical grooves 30 and are located across vertical walls.

Next, a description will be given of a plug-in connector (denoted by the reference numeral CP) connected to the receiving connector CS shown in FIG. 9 with reference to a front view of FIG. 13 and a side view of FIG. The insertion-side connector CP mainly includes a main body 35 that can be fitted into the tubular portion 25 of the receiving-side connector CS. Two right and left lead wires 36 are drawn out from the upper surface of the main body 35. Each lead wire 36 is electrically connected to an external connection terminal (not shown) provided in the main body 35.

On the front surface of the main body 35, there is provided a first engagement piece 37 having an elasticity and protruding upward from a substantially lower portion of the center thereof and projecting substantially parallel to the first engagement piece 37. Left and right second engagement pieces 38 having elasticity and extending upward, left and right guide projections 39 projecting from left and right corners of the lower end, and upper end sides of the respective second engagement pieces 38 And a projecting piece 40 projecting therefrom is formed. A locking projection 41 protrudes from the center of the front surface of the first engagement piece 37. The upper ends of the first engagement piece 37 and the left and right engagement pieces are connected in series, and the left and right convex portions 42 project from the front surface thereof.

When connecting the plug connector CP to the receiving connector CS, the plug connector CP is inserted into the receiving connector CS. At this time, the first engagement piece 37 and the second engagement piece 38 of the insertion connector CP are engaged with the first vertical groove 29 and the second vertical groove 30 of the receiving connector CS. The guide protrusion 39 of the insertion-side connector CP is engaged with the third vertical groove 31 of the receiving-side connector CS. Then, with the insertion of the insertion-side connector CP, the locking projection 41 is formed by utilizing the elasticity of the first engagement piece 37 and the second engagement piece 38 so that the cylindrical portion 2 of the receiving-side connector CS is formed.
5 is inserted into the drain groove 27 over the back surface of the locking portion 28 of FIG. 5 and engages with the locking portion 28 in a retaining state, whereby the connection of the insertion-side connector CP is completed.

[0015] The receiving connector CS
Terminal 26 and main body 3 of plug connector CP
5 is electrically connected to an external connection terminal (not shown).
Plug connector C to receiving connector CS
The connection state of P is shown in a perspective view in FIG. 15 and a cross-sectional view in FIG. As shown in FIG. 15, in the connection state, the protrusion 40 and the protrusion 42 of the insertion-side connector CP face the upper edge of the front plate 25b of the tubular portion 25 of the receiving-side connector CS in a close state.

When the plug-in connector CP is detached from the receiving connector CS, the left and right convex portions 42 of the plug-in connector CP are pressed against the main body 35, and the locking projections 41 with respect to the locking portions 28 of the receiving connector CS. May be released, and in this state, the insertion-side connector CP may be removed from the reception-side connector CS.
As described above, the receiving-side connector CS and the insertion-side connector CP have a one-touch detachable structure having a locking function for preventing the connector from coming off.

[0017]

In the above-mentioned conventional fuel pump, the applicant has experimentally confirmed that the vibration generated in the pump section 2 is finally applied to the synthetic resin motor cover 4 having the fuel discharge port 16. It has been found that noise is increased by being transmitted and amplified by the tubular portion 25 of the receiving connector CS. Incidentally, the reason why the tubular portion 25 of the receiving side connector CS is one of the causes of the increase in noise is considered that the motor cover 4 is resin-molded in consideration of electric insulation, moldability, and the like.
The receiving-side connector CS is formed in a shape similar to general electric equipment, and the thickness t (see FIGS. 9 and 11) of the tubular portion 25 is thin.

Accordingly, an object of the present invention is to provide a fuel pump capable of reducing noise by preventing vibration of a cylindrical portion of a receiving connector formed on a motor cover.

[0019]

According to one aspect of the present invention, there is provided a pump unit for sucking fuel and increasing the pressure, and a motor unit for driving the pump unit. Wherein the motor portion is provided with a synthetic resin motor cover having a fuel discharge port and a receiving connector for electrical wiring, wherein the cylindrical shape of the receiving connector formed on the motor cover is provided. The part is reinforced by reinforcing means.
With this configuration, the cylindrical portion of the receiving connector formed on the motor cover is reinforced by the reinforcing means, so that vibration of the cylindrical portion of the receiving connector can be prevented and noise can be reduced.

According to a second aspect of the present invention, there is provided the fuel pump according to the first aspect, wherein the reinforcing means is a thickened tubular portion. With this configuration, the cylindrical portion of the receiving connector formed on the motor cover can be strengthened by thickening.

The third aspect of the present invention is the first or second aspect.
The fuel pump according to any one of the preceding claims, wherein the reinforcing means is an insert member that is insert-molded in the cylindrical portion. With this configuration, the cylindrical portion of the receiving connector formed on the motor cover can be reinforced by the insert member.

According to a fourth aspect of the present invention, there is provided a pump section for sucking fuel and increasing the pressure, and a motor section for driving the pump section, wherein the motor section has a fuel outlet and a receiving port for electric wiring. In a fuel pump provided with a synthetic resin motor cover having a side connector, a cylindrical portion of a receiving connector formed on the motor cover, and a main body of a plug-in connector connected to the receiving connector. An elastic member interposed in a state in which the elastic member is elastically deformed is provided. According to this structure, the elastic deformation of the elastic member interposed between the tubular portion of the receiving connector formed on the motor cover and the main body of the insertion connector causes the vibration of the tubular portion of the receiving connector. And transmission of vibration from the cylindrical portion to the main body of the insertion-side connector can be prevented, and thus noise can be reduced.

According to a fifth aspect of the invention, there is provided the fuel pump according to the fourth aspect, wherein the elastic member is a clip made of a leaf spring which is attached to the cylindrical portion by utilizing elasticity. With this configuration, the elastic deformation of the leaf spring clip prevents vibration of the tubular portion of the receiving connector, and absorbs vibration transmitted from the tubular portion to the main body of the insertion-side connector. In addition, the leaf spring clip can be easily attached to the tubular portion of the receiving side connector by utilizing its elasticity.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A first embodiment will be described with reference to FIGS. In the first embodiment, a part of the fuel pump of the conventional example is modified, so that the modified part will be described in detail, and redundant description will be omitted. FIG. 1 is a perspective view of the motor cover 4 and FIG. 2 is a plan view of the same. In the first embodiment, the cylindrical portion 25 of the receiving-side connector CS of the motor cover 4 has a thickness T (T = 2t) that is approximately twice as large as the thickness t of the conventional product (see FIG. 11). It is a thing. More specifically, the rear plate portion (the reference numeral 25c is attached) of the tubular portion 25 and the left and right side plate portions (the reference numeral 25c).
25d and 25e are attached. ) Is formed with a thickness T,
Only the left and right portions of the front plate 25b are thickened. Note that the inner shape of the cylindrical portion 25 is formed in the same shape as a conventional product. The thickening of the cylindrical portion 25 corresponds to a reinforcing means in the present invention.

With this configuration, the cylindrical portion 25 of the receiving connector CS formed on the motor cover 4 is strengthened by thickening.
The vibration of the cylindrical portion 25 can be prevented to reduce noise.

Second Embodiment A second embodiment will be described with reference to FIGS. The second embodiment is a partial modification of the first embodiment, and thus the modified portion will be described in detail, and redundant description will be omitted. FIG. 3 is a partially cutaway perspective view of the motor cover 4, and FIG. 4 is a perspective view of the insert member. In the second embodiment, as shown in FIG.
Tubular portion 25 of receiving connector CS of motor cover 4
Then, a metal insert member 44 is insert-molded. The insert member 44 is connected to the front plate 2 of the tubular portion 25.
5b and the left and right side plates 25d, 25e. Note that the insert molding of the insert member 44 corresponds to a reinforcing means in the present invention.

With this configuration, the cylindrical portion 25 of the receiving connector CS formed on the motor cover 4 is strengthened by the insert member 44, so that vibration of the cylindrical portion 25 of the receiving connector CS is prevented. Noise can be reduced. Note that the insert member 44 is formed of the cylindrical portion 25 of the receiving side connector CS of the conventional example (see FIG. 9).
Can also be insert-molded.

Third Embodiment A third embodiment will be described with reference to FIGS. In the third embodiment, a part of the conventional example is modified, so that the modified part will be described in detail, and redundant description will be omitted. FIG. 5 is a sectional view of a main part, FIG. 6 is a perspective view of the motor cover 4, and FIG. 7 is a perspective view of a clip. In the third embodiment, as shown in FIG. 5, the cylindrical portion 25 of the receiving-side connector CS of the motor cover 4 is
The clip 46 made of a leaf spring having the shape shown in FIG.

More specifically, as shown in FIG. 6, an engagement hole 47 is opened substantially at the center of the rear plate 25c of the tubular portion 25 of the receiving connector CS. On the other hand, the clip 46
As shown in FIG. 7, a front plate portion 46a and a rear plate portion 46b are formed by bending a band-shaped plate spring material into a substantially inverted U-shape. At a substantially central portion of the front piece portion 46a, a pressing portion 46c bent forward in a mountain shape is formed. An engagement portion 46d is formed in a substantially central portion of the rear piece portion 46b so as to be bent forward in a mountain shape.

The clip 46 is, as shown in FIG.
The rear plate portion 25c having the engagement hole 47 is attached so as to be sandwiched between the front piece portion 46a and the rear piece portion 46b by using elasticity, and the elasticity of the clip 46 is used in the engagement hole 47 of the rear plate portion 25c. As a result, the engaging portion 46d is engaged with the rear plate portion 25c. At this time, the pressing portion 46
c is in a free state shown by a two-dot chain line 46c in FIG. The leaf spring clip 46 corresponds to the elastic member according to the present invention.

When the insertion connector CP is connected to the receiving connector CS to which the clip 46 has been attached, the pressing portion 46c of the front piece 46a of the clip 46 is pressed by the rear surface of the main body 35 of the insertion connector CP. Pressed. As a result, the front piece 46a of the clip 46 is elastically deformed between the rear plate 25c and the main body 35 as shown in FIG.

According to the third embodiment, the pressing portion of the leaf spring clip 46 interposed between the cylindrical portion 25 of the receiving connector CS formed on the motor cover 4 and the main body 35 of the insertion connector CP. Due to the elasticity of 46c, the vibration of the cylindrical portion 25 of the receiving connector CS can be prevented, and the transmission of vibration from the cylindrical portion 25 to the main body 35 of the plug-in connector CP can be prevented. Reduced. In addition, clip 4 made of leaf spring
Reference numeral 6 denotes a thickened tubular portion 25 of the receiving-side connector CS of the first embodiment (see FIG. 1), or a second embodiment.
The insert member 44 of the receiving-side connector CS (see FIG. 3) may be provided in the insert-molded cylindrical portion 25.

The present invention is not limited to the above embodiment, but can be modified without departing from the scope of the present invention. For example, as the reinforcing means, the thickness of the tubular portion 25 of the receiving-side connector CS of the motor cover 4 is increased.
In addition to the insert molding of the insert member 44, the cylindrical portion 25
It is conceivable to form a reinforcing rib on the surface. As the elastic member, it is conceivable to use a vibration-proof rubber made of a rubber material in addition to the leaf spring clip 46.

[0034]

According to the present invention, noise can be reduced by preventing vibration of the cylindrical portion of the receiving connector formed on the motor cover.

[Brief description of the drawings]

FIG. 1 is a perspective view of a motor cover according to a first embodiment.

FIG. 2 is a plan view of a motor cover.

FIG. 3 is a partially cutaway perspective view of a motor cover according to a second embodiment.

FIG. 4 is a perspective view of an insert member.

FIG. 5 is a sectional view of a principal part showing a third embodiment.

FIG. 6 is a perspective view of a motor cover.

FIG. 7 is a perspective view of a clip.

FIG. 8 is a sectional view of a fuel pump showing a conventional example.

FIG. 9 is a perspective view of a motor cover.

FIG. 10 is a side view of the same.

FIG. 11 is a plan view of the same.

FIG. 12 is a sectional view taken along line AA of FIG. 11;

FIG. 13 is a front view of the insertion-side connector.

FIG. 14 is a side view of the same.

FIG. 15 is a perspective view of the motor cover showing a connection state of the insertion-side connector.

FIG. 16 is a sectional view of the main part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor part 2 Pump part 4 Motor cover 16 Discharge port 25 Cylindrical part 35 Main part 44 Insert member (reinforcing means) 46 Clip made of leaf spring (elastic member) CS Receiving connector CP Inserting connector

Claims (5)

[Claims] 1. A pump made of synthetic resin, comprising: a pump for sucking fuel and increasing the pressure; and a motor for driving the pump. The motor has a fuel outlet and a receiving connector for electric wiring. In the fuel pump provided with the motor cover, the tubular portion of the receiving connector formed on the motor cover is reinforced by reinforcing means. 2. The fuel pump according to claim 1, wherein the reinforcing means is a thickened tubular portion. 3. The fuel pump according to claim 1, wherein the reinforcing means is an insert member formed by insert molding in a cylindrical portion. 4. A synthetic resin comprising: a pump section for sucking fuel and increasing pressure; and a motor section for driving the pump section, wherein the motor section has a fuel outlet and a receiving connector for electric wiring. In a fuel pump provided with a motor cover made of stainless steel, elastic deformation is performed between a tubular portion of a receiving connector formed on the motor cover and a main body of an insertion connector connected to the receiving connector. A fuel pump characterized by comprising an elastic member interposed in an inclined state. 5. The fuel pump according to claim 4, wherein the elastic member is a leaf spring clip attached to the cylindrical portion by utilizing elasticity.