JPH0327316Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electromagnetic switch device, particularly an electromagnetic switch device mounted on a DC motor (starter motor) for starting an engine. A cross-sectional configuration of a conventional electromagnetic switch device of this type is shown in FIG. That is, in this Figure 1,
Reference numeral 1 designates the entire electromagnetic switch device attached to a starter motor (not shown), 2 is a cylindrical yoke made of mild steel, and 3 is fitted into a through hole 2b in the center of the front end wall 2a of the yoke 2. A cylindrical non-magnetic bushing is attached, 4 is a movable iron core that is slidably fitted on the inner peripheral surface of the bushing 3, 5 is a movable iron core that is fitted to the rear end spigot part 2c of the yoke 2 together with a cap assembly 6. insert,
A fixed iron core is fixed by caulking, and a bobbin 9 molded mainly of nylon is placed on the central protrusion 5a via a cylindrical bush 7 that receives the movable iron core 5, and the bobbin 9 is wound on the bobbin 9. A solenoid 8 consisting of a coil 10 is fitted therein, and a circumferential step 5b formed on a part of the central protruding portion 5a and a circumferential step 4a at the rear of the movable core are used. A plunger spring 11 is stretched to bias the movable iron core 4 in the return direction, that is, forward. Further, 12 is a through hole formed at the center of the central protrusion 5a of the fixed iron core 5, 13 is a movable contact assembly,
14 is a movable contact shaft that is loosely fitted into the through hole 12 from behind until the flange 14a abuts; 15 is a movable contact plate that is fitted and supported on the movable contact shaft 14 via an insulating bushing 16; 17; Reference numeral 18 denotes an insulating washer and a retaining ring which receive and support the elastic force of the contact spring 19 against the movable contact plate 15, 20 a return spring which urges the movable contact shaft 14 in the return direction, that is, forward, and 21 the cap assembly. 6, a resin molded cap; 22, a pair of fixed contacts fixed to the through hole 23 of the cap 21 with a toothed washer 24, facing the movable contact plate 15; 25, a pair of fixed contacts fixed to the cap 21; Packing 26 which is clamped between the fixed contact 22
27 is a rubber packing clamped between the fixed core 5 and the cap 21;
This is an engaging portion located at the front end of the starter motor, which cam engages and connects a shift lever of a starter motor (not shown). In the conventional configuration, when the coil 10 of the solenoid 8 is energized by closing a key switch (not shown), a magnetic closed circuit of yoke 2 - fixed iron core 5 - gap - movable iron core 4 - yoke 2 is established. When the movable core 4 is energized and attracted to the fixed core 5, the movable contact shaft 14 of the movable contact assembly 13 is pressed to the left in the figure, causing the movable contact plate 15 to come into pressure contact with the pair of fixed contacts 22. This closes the main contact circuit, energizes the starter motor (not shown) with the main current, and engages the pinion with the engine ring gear via the shift lever, thereby starting the engine. However, in the conventional device configured in this way, the movable iron core 4 and the movable contact assembly 13 are separate structures, which makes it unnecessarily complicated and heavy, and the movable contact plate 15 and A pair of fixed contacts 22
If a welding phenomenon occurs, even if only mildly, due to the spark (arc) discharge that occurs during closing, the biasing force of the return spring 20 alone will not be able to separate the two. There was an inconvenience. In order to improve these conventional drawbacks, this idea uses a non-magnetic material for the movable contact shaft and integrates it into the movable iron core to simplify the structure and reduce weight, and at the same time strengthen the contact disengagement force. This is what I did. Hereinafter, one embodiment of the electromagnetic switch device according to this invention will be described in detail with reference to FIGS. 2 and 3 a to 3 c. 2, the reference numeral 28 designates the entire electromagnetic switch device, 29 a cylindrical yoke made of mild steel, and 30 integrally incorporating a member equivalent to a movable contact assembly as described later. A movable core assembly 31 is a solenoid incorporated in the yoke 29, and the movable core assembly 3 is attached to the inner peripheral surface of the solenoid.
It has a cylindrical bush 32 made of non-magnetic metal that receives the coil 3 slidably in the front and rear directions, and the coil 3 is inserted onto the bobbin 34 molded with nylon as a main component.
It is formed by winding 3. Further, 35 is a rear end spigot part 29 of the yoke 29.
a fixed iron core which is inserted and crimped together with the cap assembly 36 to form a rear lid, and whose central protrusion 35a faces the movable iron core 39 made of a mild steel member of the movable iron core assembly 30 ; Reference numeral 37 is a polymer resin mold in which a movable contact plate 38 is fitted into the rear end so as to be slidable in the front and back direction, and the front end groove 37a is fixed to the rear end groove 39a of the movable iron core 39 by caulking A. Movable contact support shaft, 4
0 is a stepped portion 35b on the inner circumference of the protruding portion of the fixed iron core 35
A return spring 41 which also serves as a plunger spring is stretched between a spring receiver formed by a spring receiver and the rear end surface of the movable iron core 39, and a return spring 41 is connected between the step portion 37b of the movable contact support shaft 37 and the movable contact plate 38. 42 is a retaining ring that is engaged with the rear end groove 37c of the support shaft 37 and receives the movable contact plate 38; 43 is a front cap assembly 36;
A pair of fixed contacts 46 are installed in a through hole 45 formed in a resin mold cap 44 and are opposed to the movable contact plate 38, and 46 is located at the front end of the movable iron core 39, and is connected to a starter motor (not shown). This is an engaging part that cam engages and connects the shift lever. However, even in the case of the configuration of the above embodiment, when the coil 33 of the solenoid 31 is energized,
Yoke 29 - Fixed core 35 - Gap - Movable core 39 -
The magnetic closed circuit of the yoke 29 is excited, and the fixed iron core 35
By adsorption of the movable iron core 39 to the movable iron core 3,
The movable contact support shaft 37 integrated with the movable contact support shaft 37 is pushed toward the left side in the figure by storing the force of the return spring 40, and presses the movable contact plate 38 against the pair of fixed contacts 43, thereby opening the main contact circuit. When the engine is closed, the main current is applied to the starter motor (not shown), and the pinion is engaged with the engine ring gear via the shift lever, thereby starting, or cranking, the engine .
1 is released, the contacts are disengaged mainly by the stored force of the return spring 40, and the movable contact assembly 30 is returned to the illustrated position. Here, the movable iron core assembly 30 in the above embodiment
Here is an example of a specific assembly procedure. That is, in FIG. 3a, a movable core blank 39 having a groove 39a on its rear end surface is processed by cold forging, and a movable contact support shaft 37 is molded from a nylon resin material containing glass fiber. Then, as shown in FIG. 3b, the movable iron core 3
The front end of the movable contact support shaft 37 is fitted into the groove 39a of No. 9, and the caulking part is bitten into the groove 37a by the caulking tool 47 to secure it A, and then as shown in FIG. 3c. , fixed core 35
The contact spring 41 and the movable contact plate 3 are inserted through the center through hole of the
8 in sequence, and finally insert the retaining ring 42 into the groove 37.
It is attached to c. Therefore, as detailed above, according to this invention,
Since the movable contact support shaft made of non-magnetic material such as polymer resin is integrally fixed to the rear end of the movable core, the movable core and the movable contact assembly are configured separately as in the past. Unlike the case, it is possible to simplify the configuration itself, reduce its weight, and
Since a spring for returning the movable iron core is used as a force for disassociating the movable contact plate from the pair of fixed contacts, the present invention has the advantage that a device configuration with reliable operation and high reliability can be obtained at a low cost. Furthermore, in this invention, the return spring is housed inside the electromagnetic switch and is supported by a spring receiver provided on the inner peripheral side of the fixed iron core 35, so that the following effects are achieved. Since the return spring can have a sufficient stroke, the most suitable spring can be selected as the return spring. Since the total length of the movable core can be shortened, the weight of the movable core can be reduced. Since there are no return springs or other mechanical parts in the vicinity of the engagement part at the front end of the movable core, even if the shift lever of the starter motor is engaged with this engagement part and linked, the operation will not be possible. This can be done without any problems.

[Brief explanation of the drawing]

Fig. 1 is a half-cut side view of the upper half of a conventional electromagnetic switch device taken at right angles to the lower half thereof, Fig. 2 is a sectional view of an embodiment of the electromagnetic switch device according to this invention, and Fig. 3 Figures a to c are diagrams showing how to assemble the main components of the same device. 28 ...Electromagnetic switch device, 29...Yoke, 3
0...Movable iron core assembly, 31 ...Solenoid, 3
5...Fixed iron core, 36 ...Cap assembly, 37
...Movable contact support shaft, 38...Movable contact plate, 39
...Movable iron core, 40...Return spring, 41...
...Contact spring, 43...Fixed contact, 44...
Cap.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A cylindrical yoke, a solenoid disposed on the inner peripheral surface of the yoke, and a solenoid that is fitted from the front side and is energized to the rear side by energizing the solenoid. a movable iron core that is suctioned to the yoke, a fixed iron core that also serves as a rear lid body and a cap assembly that are sequentially fixed to the rear of the yoke, and a front end fixed to the rear end of the movable iron core;
a movable contact support shaft made of a non-magnetic material whose rear end side penetrates the fixed iron core and protrudes into the cap assembly; a movable contact plate held at the rear end of the movable contact support shaft that protrudes into the cap assembly; a pair of fixed contacts disposed within the cap assembly and facing the movable contact plate; and a return interposed between the movable core and a spring receiver integrally provided on the inner peripheral side of the fixed core. The contact spring is arranged within the inner diameter of the return spring so that at least a portion thereof wraps around the return spring in the axial direction, and presses the movable contact plate on the movable contact support shaft. Electromagnetic switch device. (2) The scope of the utility model registration claim, which is characterized in that the grooved front end of the movable contact shaft is inserted into the groove of the rear end of the movable core, and the same end is fixed by caulking. Electromagnetic switch device (3) as described in paragraph 1: A step is formed in the middle of the movable contact shaft, and a contact spring is provided between the step and the movable contact plate which is slidably inserted and held on the shaft. An electromagnetic switch device according to claim 1, characterized in that the electromagnetic switch device is interposed.