JP3023828B2 - Electromagnetic fuel injection valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a valve operating portion having a valve port and a valve body capable of opening and closing the valve port provided at a front portion of a housing, having a bobbin and a coil wound around the bobbin. An electromagnetic drive unit that exerts an electromagnetic force for driving the valve body is provided at a rear portion of the housing, and a pair of coupler terminals connected to the coil are arranged in parallel on a synthetic resin mold portion that covers a rear end portion of the housing. The present invention relates to an electromagnetic fuel injection valve provided with a coupler protruding laterally.

[0002]

2. Description of the Related Art Conventionally, such an electromagnetic fuel injection valve is already known, for example, from Japanese Patent Application Laid-Open No. 61-178553.

[0003]

SUMMARY OF THE INVENTION In the above prior art,
The ends of the pair of connection terminals protruding from the bobbin following the coil are bent and formed so as to serve as coupler terminals.
That is, the connection terminal buried in the bobbin and the coupler terminal facing the coupler are integrated. However, the coupler terminal needs to have rigidity to withstand the electrical connection operation,
It has a comparatively large shape and size enough to exhibit its rigidity. If the connection terminal and the coupler terminal are integrated as in the above-described conventional case, the bobbin, that is, the electromagnetic drive unit also becomes relatively large. In addition, the specifications of the bobbin, that is, the electromagnetic drive unit must be changed in accordance with the different specifications of the coupler terminal, which inevitably increases the cost.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and enables a reduction in the size of a bobbin, that is, an electromagnetic drive unit, and reduces the cost by using a single electromagnetic drive unit despite a change in the specifications of a coupler terminal. An object of the present invention is to provide an electromagnetic fuel injection valve that achieves the above.

[0005]

According to a first aspect of the present invention, a valve operating portion having a valve port and a valve body capable of opening and closing the valve port is provided at a front portion of a housing. An electromagnetic drive unit having a bobbin and a coil wound on the bobbin and exerting an electromagnetic force for driving the valve body is provided at a rear portion of the housing, and a synthetic resin mold portion covering a rear end portion of the housing is provided. In an electromagnetic fuel injection valve in which a coupler facing a pair of coupler terminals connected to a coil is provided so as to protrude to the side, a pair of flat coupler terminals are formed in a flat shape having a width smaller than that of the coupler terminals. The pair of connection terminals formed and connected to the coil and projecting in parallel from the bobbin are joined in the mold portion, and the distance between the centers of both connection terminals is set to be equal to or less than the distance between the centers of both coupler terminals. That.

According to a second aspect of the present invention, in addition to the configuration of the first aspect of the present invention, both coupler terminals include
A caulking portion is formed at the ends of the two connection terminals in accordance with the caulking operation, and the caulking portion and the connection terminal are welded to each other.

According to a third aspect of the present invention, in addition to the configuration of the first aspect, in a state before the connection with the corresponding connection terminal, the two coupler terminals are connected after the connection with the connection terminal. They are connected to each other by a connecting portion that enables them to be separated from the coupler terminals.

[0008]

According to the structure of the first aspect of the present invention, the distance between the centers of the pair of connection terminals having a width smaller than the width of the pair of coupler terminals is set to be equal to or less than the distance between the centers of the two coupler terminals. This makes it possible to embed both connection terminals having a relatively small size and shape in the bobbin with a relatively small interval between them, thereby making it possible to reduce the size of the bobbin.
Moreover, since the two coupler terminals, which are different from the two connection terminals, are joined to the respective connection terminals, the specifications of the two connection terminals, that is, the specifications of the bobbin, can be fixed even if the specifications of the two coupler terminals are different. Further, the two coupler terminals and the two connection terminals formed in a flat shape are joined in a surface contact state to obtain a reliable joint state, and the press molding of the two coupler terminals and the connection terminals becomes possible.

According to the second aspect of the present invention,
Both coupler terminals and both connection terminals are joined by caulking and welding, and a more reliable joining state is obtained.

According to the third aspect of the present invention, the two coupler terminals are connected by the connecting portion before the connection with the connection terminal, so that the both coupler terminals can be accurately and easily connected at the time of connection with the connection terminal. Can be positioned.

[0011]

An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 to 4 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of an electromagnetic fuel injection valve, and FIG.
FIG. 3 is a sectional view taken along line 2-2 in FIG. 1 in a state where the molded part is seen through, FIG. 3 is a perspective view in a state where both connection terminals and both coupler terminals are joined, and FIG. 4 is a line 4-4 in FIG. It is sectional drawing which follows.

Referring to FIG. 1, the electromagnetic fuel injection valve V has a valve operating portion 6 provided at a front portion of a housing 5 and an electromagnetic driving portion 7 provided at a rear portion of the housing 5. Thus, the housing 5 is formed in a bottomed cylindrical shape having a closing plate portion 5a at a rear end, and a valve housing 8 is coupled to a front end portion of the housing 5.

An annular step portion 5b facing the front side is formed on the inner peripheral side of the base end portion, and a thin cylindrical portion 5c extending forward is provided in a portion near the front portion of the housing 5, and the thin cylindrical portion 5c is provided. 5c, a magnetic ring 9 for abutting a rear end on the step 5b, a ring-shaped stopper 10 for abutting a rear end on a front end of the magnetic ring 9, and a valve for abutting a rear end on a front end of the stopper 10. The housings 8 are inserted sequentially. Thus, the valve housing 8 is formed in a cylindrical shape with a flange 8a protruding radially outward at the rear end, and the front end of the thin cylindrical portion 5c is swaged into engagement with the flange 8a. As a result, the magnetic ring 9, the stopper 10, and the valve housing 8
To the front of the housing 5.

The valve operating portion 6 has a valve port 11 provided at the front end of the valve housing 8, and a needle-like valve body 12 slidably fitted into the valve housing 8 so that the valve port 11 can be opened and closed. And At the front end of the valve housing 8, a tapered valve seat 13 having a valve port 11 opened at the center is provided facing inward in the axial direction. The valve element 12 has a valve portion 14 that can be seated on a valve seat 13 and a pintle portion 15 that penetrates through the valve port 11 and projects forward so as to be coaxial with the valve portion 14.
And a pair of guide portions 16 and 17 spaced apart in the axial direction on the rear side of the valve portion 14.
6 and 17 slidably contact the inner surface of the valve housing 8 while securing a passage allowing the flow of fuel between the inner surface and the inner surface of the valve housing 8.

The electromagnetic drive unit 7 for opening and closing the valve body 12 includes a movable core 18, a coil 20 wound around a bobbin 19, a return spring 21, and a fixed sleeve core 22. And housing 5 between closing plate 5a and
It is arranged in.

The fixed sleeve core 22 is integrally connected to the closing plate portion 5a and is arranged coaxially with the housing 5. The bobbin 19 made of a synthetic resin includes a cylindrical portion 19a coaxially surrounding the fixed sleeve core 22, and a flange portion 19b extending radially outward at an end of the cylindrical portion 19a on the magnetic ring 9 side.
And a flange portion 19c that protrudes radially outward at the end of the cylindrical portion 19a on the side of the closing plate portion 5a, and surrounds the fixed sleeve core 22 coaxially.
And the closing plate portion 5a. And bobbin 19
In the above, the flange portion 19b on the magnetic ring 9 side is formed so as to have an outer diameter such that its outer surface is in contact with the inner surface of the housing 9, whereas the flange portion 19c on the closing plate portion 5a side is formed.
Is formed so as to have an outer diameter enough to form an annular gap 33 with the inner surface of the housing 5.

The movable core 18 is arranged so as to be axially movable between the stopper 10 and the fixed sleeve core 22, and the movable core 18 is caulked to the rear end of the valve element 12. The fixed sleeve core 22 has a cylindrical support member 2.
3 is press-fitted.
And a return spring 21 is contracted. Therefore, the movable core 18 and the valve element 12 are arranged such that the valve portion 14 of the valve element 12 is
3 is urged in the direction of sitting.

An extension cylinder 2 extending coaxially with the fixed sleeve core 22 and extending rearward is provided on the closing plate portion 5a of the housing 5.
The filter 4 is attached to the rear end of the extension tube 24.

In the bobbin 19, a pair of cylindrical portions 26, 26 extending rearward (to the right in FIG. 1) are provided in parallel and integrally with the flange portion 19c on the side of the closing plate portion 5a. A pair of through-holes 27, 27 through which 26, 26 respectively penetrate are provided in the closing plate portion 5 a of the housing 5.

2 and 3, a pair of flat connection terminals 28, 28 are embedded in the flange 19c of the bobbin 19 when the bobbin 19 is formed. And are joined together. These connection terminals 28,
Numeral 28 includes coil connecting portions 28a, 28a protruding to the side of the flange portion 19c after the bobbin 19 is completely formed. The coil connecting portions 28a, 28a
0 are connected at both ends. Moreover, both coil connecting portions 28
a and 28a are flange portions 19c after connection with the coil 20 so that the bobbin 19 is disposed in the gap 33 between the bobbin 19 and the housing 5 when the bobbin 19 is stored in the housing 5.
Of the coil 20 and the two connection terminals 28 and 2.
8 can be easily connected and the bobbin 19 can be downsized. Further, both connection terminals 28, 2
Numeral 8 has coupler connecting portions 28b, 28b projecting in parallel to the rear of the cylindrical portions 26, 26, that is, to the rear side of the housing 5 through the cylindrical portions 26, 26. 28 b is bent toward the outer side of the housing 5.

The rear end of the housing 5 is covered with a molded portion 29 made of a synthetic resin, and the molded portion 29 is integrally formed with a coupler 29a projecting laterally. Thus, a pair of coupler terminals 30, 30 which are formed in a flat shape and face in parallel with the coupler 29a are embedded in the mold portion 29, and these coupler terminals 30, 30 are embedded in the mold portion 29. Before formation, they are joined to the coupler connection portions 28b, 28b of both connection terminals 28, 28. That is, both coupler terminals 30 and 30 have
The caulking portions 30a, 30 which are caulked to the coupler connecting portions 28b, 28b of the two connection terminals 28, 28 according to the caulking operation.
are formed, and the caulked portions 30a, 30a and the coupler connection portions 28b, 28b are further welded. Thus, the joint between the coupler terminals 30, 30 and the connection terminals 28, 28 is formed by forming the mold 29.
Will be buried inside.

Moreover, before the coupler terminals 30, 30 are joined to the corresponding connection terminals 28, 28, the coupler terminals 30, 30 are connected to each other by a connection portion 31 shown by a chain line in FIG. At the connecting portion between the connecting portion 31 and the coupler terminals 30, 30, the coupler terminals 30, 30 are connected with the connecting terminals 28, 28.
Are provided for facilitating separation of the connecting portion 31 from the coupler terminals 30, 30 after the joining.

The flat connection terminals 28, 2
The width of 8 is set smaller than the width of both the coupler terminals 30, 30 are flat, and as shown in Figure 2, the distance d ₁ between the centers of the two connection terminals 28 and 28 located in parallel state ,
Distance d ₂ or less between the centers of the two coupler terminals 30 and 30 are preferably set to d ₁ <d _2.

Next, the operation of this embodiment will be described. A pair of coupler terminals 30, 30 are connected to a coil 20 and protrude from a bobbin 19 to form a pair of connection terminals 28, 28.
Are joined in a mold part 29, and both connection terminals 28, 28
Is set smaller than the width of both coupler terminals 30, 30, so that both connection terminals 28, 2 embedded in bobbin 19 are
Based on the downsizing of the motor 8, the size of the bobbin 19, that is, the electromagnetic drive unit 7 and thus the electromagnetic fuel injection valve V can be reduced. Moreover, since both coupler terminals 30, 30 are different from both connection terminals 28, 28, both coupler terminals 3
Even if the specifications of 0 and 30 change, the specifications of both connection terminals 28 and 28, that is, the specifications of the bobbin 19 and the electromagnetic drive unit 7 can be fixed, whereby the cost can be reduced.

Since the distance d ₁ between the centers of the connection terminals 28, 28 is equal to or less than the distance d ₂ between the centers of the coupler terminals 30, 30, the connection terminals 28, 28 in the bobbin 19 are formed.
28 can be placed closer together and the bobbin 19
Can be further reduced in size.

Further, since both coupler terminals 30, 30 and both connection terminals 28, 28 are joined together by welding in addition to caulking, a more reliable joining state can be obtained.

In addition, since both coupler terminals 30, 30 and both connection terminals 28, 28 are formed in a flat shape, the two coupler terminals 30, 30 and both connection terminals 28, 28 are joined in a surface contact state, thereby improving reliability. A certain bonding state can be obtained, and both coupler terminals 30, 30 and both connection terminals 28, 2
8 can be performed, and the molding cost can be reduced.

Further, before the coupler terminals 30, 30 are joined to the connection terminals 28, 28, the coupler terminals 30, 30 are connected to each other by a coupling portion 31 capable of being separated from the coupler terminals 30, 30. Therefore, both the coupler terminals 30 and 30 can be accurately and easily positioned at the time of joining with the connection terminals 28 and 28, and the connecting portion 31 is separated from the both coupler terminals 30 and 30 after joining with the connection terminals 28 and 28. By doing so, an insulated state between both coupler terminals 30, 30 can be easily obtained.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

[0031]

As described above, according to the first aspect of the present invention, the pair of coupler terminals formed in a flat shape are formed in a flat shape narrower than the coupler terminals, and are connected to the coil. The pair of connection terminals projecting in parallel from the bobbin are joined in the mold portion, and the distance between the centers of the two connection terminals is set to be equal to or less than the distance between the centers of the two coupler terminals. The size can be reduced, and the cost can be reduced by keeping the specifications of both connection terminals, ie, the specifications of the bobbin, constant even if the specifications of both coupler terminals are different. In addition, both coupler terminals and both connection terminals can be joined in a surface contact state to obtain a reliable joint state, and press-molding of both coupler terminals and connection terminals is possible, thereby further reducing costs. .

According to the second aspect of the present invention, in addition to the configuration of the first aspect of the present invention, both coupler terminals include
A caulked portion is formed at the ends of both connection terminals in accordance with the caulking operation, and the caulked portion and the connection terminal are welded to each other, so that a more reliable joining state can be obtained.

According to a third aspect of the present invention, in addition to the configuration of the first aspect of the present invention, in a state before the connection with the corresponding connection terminal, the two coupler terminals are connected after the connection with the connection terminal. Since they are connected to each other by a connecting portion that enables separation from the coupler terminals, both coupler terminals can be accurately and easily positioned at the time of joining with the connection terminals.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an electromagnetic fuel injection valve.

FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1 in a state where a mold part is seen through.

FIG. 3 is a perspective view in a state where both connection terminals and both coupler terminals are joined.

FIG. 4 is a sectional view taken along line 4-4 in FIG. 2;

[Explanation of symbols]

Reference Signs List 5 housing 6 valve operating unit 7 electromagnetic drive unit 11 valve port 12 valve body 19 bobbin 20 coil 28 connection terminal 29 mold section 29a ... coupler 30 ... coupler terminals 30a ... crimping portion 31 ... connecting portion d _1, d ₂ ... center spacing V ... electromagnetic fuel injection valve

Claims (3)

(57) [Claims] A valve operating section (6) having a valve port (11) and a valve element (12) capable of opening and closing the valve port (11) is provided at a front portion of a housing (5), and a bobbin (19). And an electromagnetic drive unit (7) having a coil (20) wound around the bobbin (19) and exerting an electromagnetic force for driving the valve element (12) is provided at a rear portion of the housing (5);
A coupler (29a), in which a pair of coupler terminals (30) connected to the coil (20) face in parallel, protrudes laterally from a synthetic resin mold part (29) covering the rear end of the housing (5). In the electromagnetic fuel injection valve, a pair of flat-shaped coupler terminals (30) are formed in a flat shape narrower than the coupler terminals (30), and are connected to the coil (20) to form a bobbin. A pair of connection terminals (28) protruding in parallel from (19) are connected to the molding portion (2).
9) wherein the distance (d ₁ ) between the centers of the connection terminals (28) is set to be less than or equal to the distance (d ₂ ) between the centers of the coupler terminals (30). Fuel injection valve. 2. A caulking portion (30a), which is coupled to an end of each of the connection terminals (28) according to a caulking operation, is formed on each of the coupler terminals (30), and the caulking portions (30a) and the connection terminals are formed. 2. The electromagnetic fuel injection valve according to claim 1, wherein the (28) are welded to each other. 3. In a state before joining with the corresponding connection terminal (28), both coupler terminals (30) can be separated from the coupler terminal (30) after joining with the connection terminal (28). 2. The electromagnetic fuel injection valve according to claim 1, wherein the fuel injection valve is connected to each other by a connecting portion.