JP3506069B2 - Magnetic switch for starter - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnet switch used in a starter for starting an engine.

[0002]

2. Description of the Related Art As a conventional technique, for example, JP-A-61-1
There is a magnet switch disclosed in Japanese Patent No. 35019. As shown in FIG. 9, this magnet switch has a center case 110 that holds a solenoid 100 inside.
And a terminal case 120 having switch terminals (not shown) connected to a key switch circuit of the vehicle, and a switch cover 13 for covering a rear end opening of the terminal case 120.
0, and the screw portion 141 of the through bolt 140 is screwed into the center case 110 through the switch cover 130 and the terminal case 120 from the rear of the switch cover 130 (the upper side in FIG. 9) to screw the terminal case 120 and the switch. The cover 130 is fixed to the center case 110.

[0003]

However, in the conventional magnet switch, the terminal case 120 is taken out inside the terminal case 120 in a state where the terminal case 120 is temporarily assembled to the center case 110 (a state where the terminal case 120 is not fixed by the through bolt 140). It is necessary to connect the coil end of the solenoid 100 to the terminal of the existing switch terminal by soldering or the like. That is, the center case 110 is connected to the terminal case 120.
Is assembled, the assembled state is held while pressing the opening end face of the terminal case 120, the coil end of the solenoid 100 is soldered to the terminal of the switch terminal, and the terminal case 120 is covered with the switch cover 130 to attach the through bolt. It is fixed at 140. At this time, the solenoid 10
The coil end portion of 0 is soldered to the terminal with R-shaped slack in order to prevent disconnection (see FIG. 3).

In the above method, it is necessary to remove the force applied to the open end surface of the terminal case 120 in order to cover the switch cover 130 on the open end surface of the terminal case 120 after soldering the coil end portion to the terminal. . As a result, the terminal case 120 may rise due to the restoring force of the packing 150 sandwiched between the center case 110 and the terminal case 120, and the assembling position of the center case 110 and the terminal case 120 may shift. Therefore, with the conventional structure, it is difficult to control the slack shape of the coil end, and in the worst case, the slack disappears,
There was a risk of disconnection due to engine vibration.

A waterproof packing 160 is also arranged between the terminal case 120 and the switch cover 130. The switch cover 130 is covered with the packing 160 placed on the open end surface of the terminal case 120. So
The position of the packing 160 is likely to shift when the switch cover 130 is covered. As a result, there is a problem in that the packing 160 is not properly assembled and the waterproof property cannot be ensured. The present invention has been made in view of the above circumstances, and a first object thereof is to provide an assembling structure capable of stably maintaining a slack shape of a coil end connected to a terminal of a switch terminal. A second object is to provide an assembling structure capable of positioning the waterproof packing.

[0006]

Means for Solving the Problems (Means of Claim 1) In a terminal case used in a magnet switch of the present invention.
Is a cylindrical metal part around the stud bolt
The material is insert molded. For the stud bolt , attach the first screw part to the inner circumference of the metal member from the rear end side of the terminal case.
Insert it and screw it into the center case. The axial force generated by the screwing is applied to the metal member through the bolt head to fix the terminal case and connect it to the second screw portion through the switch cover. The switch cover is fixed by connecting the members and applying an axial force generated by tightening the connecting members to the switch cover. In addition, the terminal
The stud bolt is a metal member that is insert-molded on the base.
Since it receives the tightening force of
The force is not reduced, and the terminal case is not
Can be fixed stably.

In this assembly structure, the center case and the terminal case can be fixed to each other and the terminal case and the switch cover can be fixed to each other separately. Therefore, the terminal case is assembled to the center case and fixed with the stud bolts. Thus, the coil end of the solenoid can be joined (eg, soldered) to the switch terminal. In this case, since the terminal case does not come off from the center case before the switch cover is fixed to the rear end opening of the terminal case, the slack shape provided at the coil end of the solenoid can be easily managed.

(Means for Claim 2) A waterproof packing is arranged between the rear end surface of the terminal case and the switch cover, and the packing is positioned with respect to the terminal case by the bolt head. As a result, defective packing of the packing to the terminal case can be prevented, so that the waterproof property can be reliably ensured.

(Means of Claim 3) In both of the facing surfaces of the center case and the terminal case facing each other in the tightening direction of the stud bolt, one of the facing surfaces has a cylindrical protrusion around the stud bolt. The other opposite surface is provided with an annular hole into which the protrusion fits.By fitting the protrusion into the hole, the center case and terminal case are positioned in the radial and circumferential directions. Be seen.

(Means for Claim 4) With the tip end surface of the protrusion abutting the bottom surface of the hole, the facing surface of the center case and the facing surface of the terminal case are provided on the inner peripheral side or the outer peripheral side of the protruding portion. A predetermined gap is provided between and, and packing is arranged in this gap. In this case, since the packing can be positioned by the protrusion, it is possible to prevent the packing from being improperly assembled.

(Means of Claim 5) The terminal case is made of synthetic resin . Terminal case
A metal member is insert-molded into the
Since it receives the tightening force of the stud bolt at
Even when the terminal case receives heat and causes creep, the tightening force of the stud bolt is not reduced, and the terminal case can be stably fixed to the center case.

[0012] (wherein means to claim 6) metal member is cylindrical shaped one end is provided to protrude from the facing surface of the terminal case as protrusions. In this case, since the protruding portion can be formed of a metal member, for example, as compared with the case where the protruding portion is provided in a resin-made terminal case, the material strength is improved, so that the sectional area of the protruding portion can be reduced and the magnet switch The size can be reduced.

(Means for Claim 7) As the connecting member, a nut combined with the second screw portion of the stud bolt can be used.

(Means of Claim 8) As the connecting member, it is possible to use a cup washer which applies an elastic force to connect with the second screw portion of the stud bolt to generate an axial force.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. (First Embodiment) FIG. 1 is a half sectional view (sectional view taken along the line AA in FIG. 2) of the magnet switch 1 along the axial direction. The magnet switch 1 of the present embodiment is used in a decelerating starter A that decelerates the rotation speed of a starting motor 2 to drive a pinion gear 3, as shown in FIGS. 4 and 5, for example. Note that the structure and operation of the starter A are extremely well known, and a description thereof will be omitted here.

The magnet switch 1 is provided with a plunger 4 which is slidably movable on the inner circumference of a solenoid (described below). With the movement of the plunger 4, a motor provided in an energizing circuit of a starting motor 2 is provided. The center case 5, the terminal case 6, which can open and close the contacts and constitute the outer shell,
And the switch cover 7 and the like. The motor contacts are a movable contact 8 attached to the end of the plunger 4, and a set of fixed contacts 9 (9
A, 9B). As shown in FIG. 1, the movable contact 8 is attached to the plunger 4, which is a magnetic body, via an insulating bush 10.

As shown in FIG. 2 (a plan view from the rear side with the switch cover 7 removed), the fixed contacts 9 are connected to the terminal bolts 11, respectively, and the terminal case 11 is connected through the terminal bolts 11. It is fixed at 6. The terminal bolt 11 is a positive terminal bolt 11A connected to the positive terminal of the battery via a cable (not shown).
Is a terminal bolt 11B on the negative side connected to the field coil 2a (see FIG. 4) of the starting motor 2 via a lead wire (not shown). The nut 12 is attached to the screw part taken out of the terminal case 6, respectively. It is fastened and fixed to the terminal case 6.

The solenoid is composed of a suction coil 13 and a holding coil 14, and the suction coil 1 is provided around the bobbin 15.
3 and the holding coil 14 are overlapped and wound, and are held inside the center case 5. The suction coil 13 has a switch terminal 1 whose one end is molded and fixed to the terminal case 6.
6 is connected to the terminal 16a, and the other end is connected to the terminal 17 which is electrically connected to the negative terminal bolt 11B. The holding coil 14 has a suction coil 13 at one end thereof.
Similarly, the switch terminal 16 is connected to the terminal 16a, and the other end is grounded. Both coils 1
As shown in FIG. 3 (view B of FIG. 2), one end sides of 3, 14 are pulled out from the convex portion 15 a of the bobbin 15 and connected to the terminal 16 a, but in order to prevent disconnection,
R is provided between the convex portion 15a of the bobbin 15 and the terminal 16a.
Shape slacks 13a and 14a are provided.

The switch terminal 16 is, as shown in FIG.
It has a connector portion 16b exposed to the outside of the terminal case 6, and is connected to a key switch circuit of the vehicle through this connector portion 16b. The terminal 16 a of the switch terminal 16 is taken out inside the terminal case 6.
The terminal 17 to which the other end of the suction coil 13 is connected,
Negative side terminal bolt 11 together with the other fixed contact 9B
It is fixed to the terminal case 6 by B.

The magnet switch 1 of this embodiment is shown in FIG.
As shown in FIG. 5, the terminal case 6 arranged on the rear side of the center case 5 is fixed to the center case 5 by the stud bolts 18, and the switch cover 7 that closes the rear end opening of the terminal case 6 has the stud bolts 18 described above. It is fixed to the terminal case 6 by utilizing. The stud bolt 18 has a first screw portion 18a provided on one end side, and a hexagonal head portion 18b and a second screw portion 18c provided on the other end side.

The terminal case 6 is made of, for example, a synthetic resin having an insulating property, and as shown in FIG. 1, receives a tightening force of the stud bolt 18 and is a cylindrical metal member (hereinafter referred to as a cylindrical metal fitting 19). Is insert-molded, and the stud bolt 18 is inserted into the cylindrical metal member 19. The end of the cylindrical metal fitting 19 on the side of the center case 5 is provided so as to project from the front end surface of the terminal case 6 by a predetermined length L (this is called a projection 19a), and the switch cover 7 is provided.
The side end is provided so as to slightly project from the rear end surface of the terminal case 6.

The center case 5 is formed by, for example, aluminum die-casting, and on the facing surface facing the terminal case 6, as shown in FIG. 1, an annular counterbore hole into which the protruding portion 19a of the cylindrical metal fitting 19 is fitted. 5a and a female screw portion 5b into which the first screw portion 18a of the stud bolt 18 is screwed are formed in the center of the counterbore 5a. However,
The depth D of the counterbore 5a is determined by the protrusion 19a of the cylindrical metal fitting 19.
Is shorter than the length L (L> D). By setting the relationship of L> D, a gap (LD) is formed between the end surface of the center case 5 and the end surface of the terminal case 6, which are opposed to each other in the assembling direction, on the outer periphery of the protruding portion 19a of the cylindrical metal member 19. ) Occurs, the waterproof packing 20 can be arranged in this gap. The packing 20 is provided with a round hole (not shown) for allowing the protruding portion 19a of the cylindrical metal fitting 19 to pass therethrough.

The switch cover 7 is press-formed from, for example, an iron plate, and the second screw portion 18c of the stud bolt 18 is formed.
A round hole (not shown) is formed to pass through. The switch cover 7 is arranged in contact with the end surface of the hexagonal head portion 18b through the second screw portion 18c in the round hole. At this time, between the rear end surface of the terminal case 6 and the switch cover 7,
As shown in FIG. 1, since a gap S corresponding to the thickness of the projecting portion 19a of the cylindrical metal fitting 19 and the hexagonal head portion 18b is formed, the waterproof packing 21 can be arranged in this gap S. The packing 21 is provided with a round hole (not shown) for passing the hexagonal head portion 18b.

Here, a method of fixing the terminal case 6 and the switch cover 7 to the center case 5 using the stud bolts 18 will be described. First, the terminal case 6 is assembled to the center case 5 via the waterproof packing 20. As described above, the packing 20 is inserted into the clearance formed on the outer periphery of the protruding portion 19a by passing the protruding portion 19a of the cylindrical metal fitting 19 through the round hole as described above, and the end surface of the center case 5 and the terminal case facing each other in the assembling direction. It is sandwiched between the end face of No. 6 and. Further, the terminal case 6 can be positioned with respect to the center case 5 by fitting the projecting portion 19a of the cylindrical metal fitting 19 into the counterbore 5a of the center case 5.

With the terminal case 6 assembled to the center case 5, the stud bolt 18 is passed from the rear end side of the terminal case 6 to the inside of the cylindrical metal fitting 19, and the first screw portion 18a of the stud bolt 18 is inserted into the center case 5. It is screwed into the female screw part 5b formed in
To fix. Thereafter, the ends of the suction coil 13 and the holding coil 14 drawn out from the convex portion 15a of the bobbin 15 are provided with slack shapes 13a and 14a, and both coil ends are soldered to the terminal 16a of the switch terminal 16, or Join by welding, etc.

After connecting both coil ends of the suction coil 13 and the holding coil 14 to the terminal 16a, the terminal case 6
The switch cover 7 is inserted through the packing 21 into the rear end opening.
Then, the nut 22 is tightened and fixed to the second screw portion 18c of the stud bolt 18 protruding from the round hole of the switch cover 7. The packing 21 is mounted in the gap formed on the outer periphery of the hexagonal head 18b by passing the hexagonal head 18b through the round hole as described above, and is sandwiched between the rear end surface of the terminal case 6 and the switch cover 7. It

(Effect of the First Embodiment) The magnet switch 1 of the present embodiment uses the stud bolts 18 to fix the center case 5 and the terminal case 6, and to fix the terminal case 6 and the switch cover 7. Fixation can be done separately. In other words, it is not necessary to fix the terminal case 6 and the switch cover 7 to the center case 5 at the same time. Therefore, with the terminal case 6 assembled to the center case 5 and fixed with the stud bolts 18, the switch terminal 1
Both coil ends of the suction coil 13 and the holding coil 14 can be coupled to the terminal 16a of No. 6.

In this case, before the switch cover 7 is fixed to the rear end opening of the terminal case 6, the center case 5
Since the terminal case 6 does not come off, the position of the terminal 16a of the switch terminal 16 does not shift,
It is possible to easily manage the slack shapes 13a and 14a provided on both coil ends. As a result, the slack shape 13 of both coil ends
Since a and 14a can be stably formed, the vibration resistance can be improved.

Further, by fitting the protruding portion 19a of the cylindrical metal member 19 insert-molded in the terminal case 6 into the counterbore hole 5a formed in the end surface of the center case 5,
The terminal case 6 can be positioned with respect to the center case 5. Further, by making the depth D of the spot facing hole 5a shorter than the length L of the protruding portion 19a of the cylindrical metal fitting 19, a packing space can be provided on the outer periphery of the protruding portion 19a of the cylindrical metal fitting 19, and this packing space Packing 20
When arranging, the packing 20 can be positioned by inserting the protruding portion 19a of the cylindrical metal fitting 19 into the round hole formed in the packing 20.

Similarly, a packing space corresponding to the thickness of the hexagonal head portion 18b can be provided between the rear end surface of the terminal case 6 and the switch cover 7, and when the packing 21 is arranged in this packing space, The packing 21 can be positioned by passing the hexagonal head portion 18b through the round hole formed in the packing 21. As a result, defective assembly of the packing 20 and the packing 21 can be prevented, and waterproofness can be ensured.

In this embodiment, the tightening force of the stud bolt 18 is applied to the terminal case 6 by the insert molding of the cylindrical metal fitting 1.
Since it can be received at 9, the tightening force does not decrease even when the resin-made terminal case 6 receives heat and creeps, and the predetermined tightening force can be maintained. As a result, rattling between the center case 5 and the terminal case 6 can be prevented, and the reliability of the magnet switch 1 can be improved.

However, it is not always necessary to use the cylindrical metal fitting 19, and the terminal case 6 itself may be provided with a protruding portion that fits into the counterbore hole 5a of the center case 5. In this case, by passing the stud bolt 18 inside the protruding portion, the tightening force of the stud bolt 18 can be axially received by the protruding portion. As a result, a bending moment is not generated in the protrusion by the tightening force of the stud bolt 18, and no excessive stress is generated at the base of the protrusion made of resin. Therefore, the protrusion is formed on the terminal case 6 itself. Even with the provision, it is possible to prevent a situation in which the protruding portion is damaged. In addition, as in the above-described embodiment, the protruding portion 1 is formed by the cylindrical metal fitting 19.
In the case of configuring 9a, as compared with the case where the projecting portion is provided on the terminal case 6 itself, the material strength is improved, and thus the projecting portion 1 is formed.
Since the cross-sectional area of 9a can be reduced, there is an advantage that the magnet switch 1 can be downsized.

(Second Embodiment) FIG. 6 is a sectional view showing a fixing structure of the switch cover 7. The present embodiment shows an example in which the switch cover 7 is sandwiched and fixed between the terminal case 6 and the nut 22. Switch cover 7
6, a hole for passing the stud bolt 18 is formed by a cylindrical bent portion 7a, and the bent portion 7a is sandwiched between the terminal case 6 and the washer 23, and the stud bolt 18 Is fixed by receiving the tightening force (axial force) of the nut 22 coupled to the second screw portion 18c. Further, in the configuration of this embodiment, the switch cover 7
By providing the bent portion 7a at the end, the bent portion 7a is provided between the rear end surface of the terminal case 6 and the inner surface of the switch cover 7.
Since the gap S1 corresponding to the height of the gap is formed, the waterproof packing 21 can be arranged in this gap S1.

In the case of this embodiment, the stud bolt 1
As a coupling member coupled to the second screw portion 18c of No. 8,
A cup washer 24 may be used instead of the nut 22. As shown in FIG. 7, the cup washer 24 is an annular body having a circular planar shape, is provided as a frustoconical disc spring, and has a plurality of claw portions 24b on the periphery of the inner peripheral hole 24a.
have. As shown in FIG. 8, the cup washer 24 inserts the second screw portion 18c of the stud bolt 18 through the inner peripheral hole 24a and pushes it in until the claw portion 24b abuts the surface of the washer 23. After that, the outer peripheral portion of the cup washer 24 is pressed in the axial direction (the direction shown by the arrow in the figure) to give elasticity, and the second screw portion 18c is bitten by the claw portion 24b and fixed. As a result, an axial force is generated in the cup washer 24 by the action of the disc spring, and the axial force can press and fix the switch cover 7 to the terminal case 6.

(Modification) The cylindrical metal member 19 insert-molded in the terminal case 6 may be made of pipe material,
The plate material may be rounded into a cylindrical shape. Further, in the first embodiment, since the center case 5 is made of aluminum die cast, the magnetic circuit of the solenoid cannot be formed, but the center case 5 is made of a magnetic material (for example, iron) that can form the magnetic circuit. May be manufactured. As a means for positioning the center case 5 and the terminal case 6, a protrusion 19a is provided on the terminal case 6 side and a counterbore hole 5a is provided on the center case 5 side, but the protrusion is provided on the center case 5 side. A counterbore hole may be provided on the terminal case 6 side.

[Brief description of drawings]

FIG. 1 is a half cross-sectional view taken along the axial direction of a magnet switch.

FIG. 2 is a plan view seen from the rear side with the switch cover removed.

3 is a view from B of FIG. 2. FIG.

FIG. 4 is a side view of the starter.

FIG. 5 is a plan view seen from the rear side of the starter.

FIG. 6 is a cross-sectional view showing a switch cover fixing structure (second embodiment).

7A is a plan view of a cup washer, and FIG. 7B is a CC view.
FIG.

FIG. 8 is a cross-sectional view showing a switch cover fixing structure using a cup washer.

FIG. 9 is a half cross-sectional view taken along the axial direction of the magnet switch (prior art).

[Explanation of symbols]

1 magnet switch 5 center case 5a Counterbore hole (annular hole) 6 terminal case 7 switch cover 12 nuts 13 Suction coil (solenoid) 14 Holding coil (solenoid) 16 switch terminals 18 stud bolt 18a First screw part 18b Hexagon head (bolt head) 18c Second screw part 19 Cylindrical metal fittings (metal members) 19a Cylindrical metal fitting protrusion 20 packing 21 packing 22 Nut (joint member) 24 Cup washer (connecting member)

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadahiro Kurasawa, 1-1, Showa-cho, Kariya city, Aichi Prefecture DENSO CORPORATION (56) References JP 61-135019 (JP, A) JP 56-121220 (JP, A) Actually developed 57-54677 (JP, U) Actually developed 2-67073 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F02N 11/00 H01H 50 / 14

Claims (8)

(57) [Claims] 1. A center case for holding a solenoid therein, a terminal case provided with a switch terminal connected to a key switch circuit of a vehicle, and a terminal case arranged at a rear end side of the center case, and a rear case of the terminal case. and a switch cover covering an end opening has a first threaded portion at one end side, using a stud bolt having a bolt head and a second threaded portion at the other end, said cell
Terminal case and switch cover
It is a magnet switch for the starter where and are fixed.
The terminal case and the circumference where the stud bolt penetrates.
A cylindrical metal member is insert-molded in the enclosure, and the stud bolt is screwed into the center case by inserting the first screw portion from the rear end side of the terminal case through the inner periphery of the metal member. An axial force generated by screwing is applied to the metal member via the bolt head to fix the terminal case, and a coupling member is coupled to the second screw portion via the switch cover, A magnet switch for a starter, wherein the switch cover is fixed by applying an axial force generated by tightening the connecting member to the switch cover. 2. A waterproof packing is disposed between a rear end surface of the terminal case and the switch cover, and the packing is positioned with respect to the terminal case by the bolt head. A magnet switch for a starter according to item 1. 3. A cylindrical protrusion is provided around the stud bolt on one of the facing surfaces of the center case and the terminal case facing each other in the tightening direction of the stud bolt. On the other side,
An annular hole into which the protrusion is fitted is provided, and the center case and the terminal case are positioned in the radial direction and the circumferential direction by fitting the protrusion into the hole. The starter magnet switch according to claim 1 or 2. 4. The inner peripheral side or the outer peripheral side of the protruding portion, with the tip end surface of the protruding portion being in contact with the bottom surface of the hole portion,
4. The starter magnet switch according to claim 3, wherein a predetermined gap is provided between the facing surface of the center case and the facing surface of the terminal case, and a packing is arranged in the clearance. 5. The terminal case is made of synthetic resin.
Starter magnet switch according to claim 1, wherein the imperial Rukoto. Wherein said metal member is a starter magnet of claim 3-5 in which one end side of the cylindrical shape, characterized in that it protrudes from the facing surface of the terminal case as the projecting portion switch. 7. The starter magnet switch according to claim 1, wherein the coupling member is a nut that is combined with the second screw portion of the stud bolt. 8. The starter according to claim 1, wherein the coupling member is a cup washer that is coupled with the second screw portion of the stud bolt to generate an axial force by applying an elastic force. Magnet switch for.