JPS6145112B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a solenoid valve, and more particularly to a solenoid valve suitable for controlling the opening and closing of a low-speed fuel passage provided in a carburetor.

[Prior Art] As is well known, solenoid valves installed in carburetors are required to be relatively small and easy to assemble due to limitations such as installation space. Therefore, vibration resistance is strictly required.

For this reason, several ideas for vibration resistance have been proposed in the past, and one of them is the idea shown in Japanese Utility Model Application Publication No. 74675/1983.

That is, this is an idea regarding a mounting structure that provides vibration resistance between the solenoid valve case and cover or between the solenoid valve body and frame.

[Problem that the invention seeks to solve]

According to the above-mentioned prior art, the connection between the solenoid valve body and the frame is strong, and the structure for mounting these members has vibration resistance.

However, in these solenoid valves, in addition to the above-mentioned parts, the connection structure of the end of the coil that constitutes the solenoid part, that is, the connection structure between the end of the coil and the external lead wire, also has sufficient vibration resistance. Although this is necessary, conventional connection structures for the terminals of this coil, including the above-mentioned conventional technology, have mainly adopted a method in which the terminal of the solenoid coil is directly connected to the external lead wire, so it is difficult to avoid vibrations. However, there was a problem in that it was easy to cause poor connections.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a solenoid valve having a solenoid coil terminal connection structure with sufficient vibration resistance.

[Means for solving problems]

In order to achieve the above object, the present invention has the following technical means. That is, the present invention will be explained using the reference numerals in the attached drawings that correspond to the embodiments.
The cylindrical portion 4a of the bobbin 4 includes a movable iron core 8 having a valve body portion formed at its tip; A return spring 9 that biases the movable core 8 in the distal direction, and a fixed core 10 that magnetically attracts the movable core 8 against the spring force of the return spring 9 are sequentially inserted to constitute the electromagnetic valve body 2. A fixing plate 25 that surrounds the solenoid valve body 2 to form a magnetic path and is fixed to the end face of the solenoid section 7 on the distal end side, and a solenoid section 7 that is bent at both ends of the fixing plate 25. The metal frame 3 includes a pair of side plates 26 attached to the side surfaces of the metal frame 3, and a back plate 27 formed integrally with the fixed iron core 10 and connected to the free ends of the side plates 2,
The ground end 5b of the coil 5 is connected to the fixed iron core 10.
And in a solenoid valve that is grounded to a mounting plate 13 to which the solenoid valve main body 2 is attached via a metal frame 3; The terminal fitting 1 is connected to a terminal fitting 18 made of a metal spring material that is fixed to the terminal fitting 1.
8 resiliently contacts the outer peripheral surface of the fixed iron core 10, the ground end 5b of the coil 5 is electrically connected to the fixed iron core 10, and the back plate 27 A terminal fitting 1 is pressed into contact with the end face of the electromagnetic valve body 2 via an O-ring 34 disposed around the axis of the iron core 10, thereby elastically contacting the outer peripheral surface of the fixed iron core 10.
This is a solenoid valve characterized in that the contact space for the valve 8 is airtight.

[Effect]

As mentioned above, the ground end 5 of the solenoid coil 5
b is suddenly connected to a terminal fitting 18, and the terminal fitting 18 is in elastic contact with the fixed iron core 10. Therefore, good contact is always maintained despite severe vehicle vibrations.

In addition, the contact space of this resiliently contacting portion is kept airtight, and there is little risk of dust etc. entering, so there is no risk of impairing the resilient contact.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In the figure, reference numeral 1 denotes a solenoid valve, which is composed of a solenoid valve main body 2 and a metal frame 3. The solenoid valve body 2 is the third
As shown in the figure, a coil 5 wound around a resin bobbin 4 is covered with a molded body 6 to constitute a solenoid part 7, and inside the cylindrical part 4a of the bobbin 4, there is a cylindrical inner diameter. A movable iron core 8 made of a cylindrical body with a slightly smaller diameter and a return spring 9 made of a conical coil.
and a fixed core 10 that magnetically attracts the movable core 8 against the spring force of the return spring 9 are sequentially inserted therethrough. A small diameter valve body 11 is protruded from the tip of the movable iron core 8, and the valve body 11 has a small diameter.
protrudes from a hole 12 formed in the distal end surface of the cylindrical portion 4a, and can face the valve seat 14 of the attached body 13. The return spring 9 urges the valve body 11 toward the valve seat 14 side.

That is, it is for urging the movable iron core 8 in the direction of the tip. Further, an annular groove 15 is formed on the outer peripheral surface of the distal end side of the fixed iron core 10, and an O-ring 16 fitted into the annular groove 15 comes into contact with the inner wall surface of the cylindrical portion 4a to ensure airtightness. . Said coil 5
A power supply end 5a and a ground end 5b are connected to terminal fittings 17 and 18 provided on the solenoid section 7 via a molded body 6, respectively. That is, the power supply end 5a
One end thereof is inserted and sealed into a groove 19 formed in the collar 4b of the bobbin 4, and is connected to a terminal fitting 17 fixed by a molded body 6. This terminal fitting 17
The other end protrudes outward from the mold body 6, and the lead wire 20 is connected to the protrusion, and the cladding tube 2
Covered by 1. The other ground end 5b is hooked onto a protrusion 22 formed on the collar 4b of the bobbin 4, and is connected to a terminal fitting 18 which is disposed on the collar 4b and fixed with a molded body 6. This terminal fitting 18 is made of a metal spring material, and the bobbin 4
An arcuate curved portion 23 is formed at one end facing the cylindrical side of the iron core 10, and is configured to come into elastic contact with the outer circumferential surface of the fixed iron core 10.

Next, the metal frame 3 is for forming a magnetic path for the magnetic flux generated by the coil 5, and is provided with an O
A fixing plate 25 made of metal (iron or other ferromagnetic material) that is abutted and fixed via a ring 24, and the fixing plate 25
a pair of side plates 26 that are bent at both ends of the solenoid section 7 and attached to the side surfaces of the solenoid section 7;
It consists of a back plate 27 which is integrally formed with and connected to the free end portions of each of the side plates 26. A recessed portion 28 is formed on the tip surface of the side plate 26, while a convex portion 29 is formed on the edge of the back plate 27 in correspondence with each recessed portion 28, so that the side plate 26 and the back plate 27 can be connected to each other by fitting the protrusion 29 into the recess 28 and caulking the side pieces 28a, 28a of the recess 28 toward the protrusion 29. The fixing plate 25 has a bracket part 30 connected to one side thereof, and the bracket part 30 has a round hole 32 and a long hole 33 for inserting a fixing screw 31 therethrough. Further, the back plate 27 comes into contact with the end face of the solenoid part 7 via an O-ring 34 disposed around the axis of the fixed iron core 10, and the terminal fitting 18 contacts the fixed iron core elastically. The airtightness of the space can be ensured.

In the figure, 35 is on one side of the side wall of the solenoid section 7.
It is a clamp part formed as a part of the mold 6, has an inverted L-shape in cross section, and has a hanging piece 35a.
A locking protrusion 36 is formed inside the tip.
One side of the lead wire 20 can be locked to this clamp portion 34 .

To assemble such a solenoid valve 1, the coil 5
Terminal fittings 17, 1 are attached to the resin bobbin 4 wound with
8 and a molded body 6 covering the coil 5.
A solenoid section 7 configured by being fixed is prepared in advance. Next, the solenoid part 7 is set on the fixed plate 25, and the movable iron core 8 and the return spring 9 are sequentially inserted into the cylindrical part 4a of the resin bobbin 4 from the opening on the base end side, and then the base of the solenoid part 7 is inserted. The fixed iron core 10 with the O-ring 34 disposed on the end face and the O-ring 16 mounted in the annular groove 15 is then inserted into the cylindrical portion 4a. As described above, the movable iron core 8, the return spring 9, and the fixed iron core 10 are arranged on the axis of the solenoid part 7, and the solenoid valve body 2 is completed.At the same time, the fixed plate 25 and the side plate 26 that constitute the metal frame 3 are
The arrangement of the back plate 27 is also completed. Therefore, side edge 2
By caulking the fitting portion between the concave portion 28 of 6 and the convex portion 29 of the back plate 27, the side plate 26 and the back plate 27 are connected, and the solenoid valve 1 is completed. That is, the solenoid valve body 2 is also the metal frame body 3.
Also, each component is rationally constructed so that it is assembled sequentially from the tip side of the solenoid part 7,
Assembly work can be done more efficiently.

Next, a procedure for assembling the electromagnetic valve 1 to the object to be attached 13 will be explained. The attached body 13 shown in FIG. 3 is a carburetor body in which this type of electromagnetic valve is used, and a valve body 11 protruding from the tip of a movable iron core 8 is mounted in the middle of a slow system fuel passage 37. A recessed portion 38 is formed into which the tip of the resin bobbin 4 can be fitted. The solenoid valve 1 has the recessed part 3
8, and the tip of the resin bobbin 4 is fitted into the recess 38, and the fixing plate 25 is brought into contact with the object to be attached 13 via the O-ring 39, and the fixing plate 25 The fixing screw 31 inserted through the round hole 32 of the bracket 30 connected to the valve is screwed into the screw hole 40 of the mounted body 13, and after adjusting the positional relationship between the solenoid valve 1 and the mounted body 13, Hole 3
By screwing the fixing screw 31 inserted into the mounting body 13 into the mounting body 13, the bracket 30 is attached to the mounting body 1.
3 to be assembled. The ground end 5b of the coil 5 is connected to the fixed iron core 10 and the metal frame 3 via a terminal fitting 18 made of a metal spring material.
Since the attached body 13 is also normally grounded, the bracket 30
If it is fixed to the object to be attached 13, the wiring of the ground end 5b of the coil 5 is completed at the same time. The power supply end 5a side of the coil 5 is connected to a lead wire 20 led from the control circuit side to the terminal fitting 17 to which the power supply end 5a is connected, and the lead wire 20 is connected to the terminal fitting 17 to which the power supply end 5a is connected. A midway portion of the wire 20 is locked to a clamp portion 35.

Terminal fitting 1 in which the ground end 5b of the coil is fixed to the bobbin 4 via the molded coating as described above.
8, and its terminal fitting 18 is in elastic contact with the outer circumferential surface of the fixed iron core 10. Therefore, at the same time as the electromagnetic valve is assembled, the electrical connection between the grounding end and the fixed iron core is completed, and the soldering is completed. Since no attachment work is required, the efficiency of assembly work can be further improved. In particular, even if the vehicle is subject to strong vibrations, the above-mentioned contact is maintained well at all times.

Further, the back plate 27 is pressed against the end surface of the electromagnetic valve body via an O-ring 34 disposed around the axis of the fixed iron core 10, thereby bringing the terminal fitting 18 and the fixed iron core 10 into contact with each other. In order to do this, the contact space provided in the solenoid section 7 is made airtight, which prevents the contact portion from rusting due to the intrusion of moisture in the air and maintains a stable contact state for many years. can.

Furthermore, in the above embodiment, the metal frame 3 is integrally formed with a bracket 30 having an insertion hole for a screw member to be screwed into the mounting body.
The bracket 30 as a mounting member and the fixing plate 25 form a single part, and the number of parts can be reduced. Further, on the outer surface of the solenoid section 7, a clamp section 35 for clamping the lead wire connected to the other end of the coil is integrally formed with the mold coating, so that the clamp section 35 for clamping the lead wire connected to the other end of the coil is integrally formed with the mold coating. There is no need to separately prepare a clamp member, and the number of parts can also be reduced in this respect.

〔Effect of the invention〕

As described in detail above, according to the present invention, the ground end 5b of the coil 5 is connected to the terminal fitting 18 made of a metal spring material fixed to the bobbin 4 through the molded coating, and the terminal fitting 18 is By resiliently contacting the outer peripheral surface of the fixed iron core 10, the ground end 5b of the coil 5 is connected to the fixed iron core 1.
0 and the back plate 2
A terminal 7 is pressed against the end surface of the electromagnetic valve body 2 via an O-ring 34 disposed around the axis of the fixed iron core 10, thereby elastically contacting the outer peripheral surface of the fixed iron core 10. Since the contact space for the metal fitting 18 is airtight, it is possible to provide a solenoid valve with a coil connection structure that can withstand vehicle vibrations sufficiently and maintain good electrical contact at all times, and also to maintain this good contact structure. It can be maintained well for many years.

Furthermore, in addition to making these advantages possible, it also has various practical advantages such as ease of assembly.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a longitudinal sectional view of the embodiment assembled to an object. 1... Solenoid valve, 2... Solenoid valve body, 3... Metal frame, 4... Resin bobbin, 5... Coil, 5a
...Power supply end, 5b...Ground end, 6...Mold body, 7...Solenoid part, 8...Movable iron core, 9...
...Return spring, 10... Fixed iron core, 11... Valve body,
17, 18... Terminal fitting made of metal spring material, 20
... Lead wire, 25 ... Fixed plate, 26 ... Side plate,
27...Backboard, 30...Bracket.

Claims (1)

[Claims] 1. A solenoid section 7 formed by covering a coil 5 wound around a resin bobbin 4 with a molded body 6;
The cylindrical portion 4a of the bobbin 4 includes a movable core 8 having a valve body portion formed at its tip, a return spring 9 that biases the movable core 8 toward the tip, and a return spring 9 that resists the spring force of the return spring 9. The fixed core 10 that magnetically attracts the movable core 8 is sequentially inserted into the solenoid valve body 2.
further includes a fixing plate 25 that surrounds the solenoid valve body 2 to form a magnetic path and is fixed to the end face of the solenoid section 7 on the distal end side, and a fixing plate 25 that is bent at both ends of the fixing plate 25. a pair of side plates 26 which are formed by the solenoid section 7 and attached to the side surfaces of the solenoid section 7; and a back plate 27 which is formed integrally with the fixed iron core 10 and connected to the free ends of each of the side plates 2. the ground end 5b of the coil 5;
is a solenoid valve that is grounded via the fixed iron core 10 and the metal frame 3 to a mounted body 13 to which the solenoid valve main body 2 is attached; The terminal fitting 1 is connected to the terminal fitting 18 made of a metal spring material fixed to the bobbin 4 through the
8 resiliently contacts the outer peripheral surface of the fixed iron core 10, the ground end 5b of the coil 5 is electrically connected to the fixed iron core 10, and the back plate 27 A terminal fitting 1 is pressed into contact with the end face of the electromagnetic valve body 2 via an O-ring 34 disposed around the axis of the iron core 10, thereby elastically contacting the outer peripheral surface of the fixed iron core 10.
8. A solenoid valve characterized in that the contact space for the valve is airtight. 2. The metal frame 3 is integrally formed with a bracket 30 having an insertion hole 32 for a screw member 3 screwed onto the attached body 13. Solenoid valve. 3. A clamp portion for clamping a lead wire 20 connected to the other end of the coil 5 is integrally formed on the outer surface of the solenoid portion 7 with the mold coating. A solenoid valve according to claim 1.