JPS63186962A - Magnet switch for starter - Google Patents

Abstract

PURPOSE:To maintain the sealability between a switch cover and a switch housing even when the switch housing is compact, by providing a bush and a seal member between the switch cover and the switch housing. CONSTITUTION:A seal member 19 has a shape to be fitted on a disc portion 16a of a switch cover 16, and when it is fitted on the disc portion 16a, a bush 18 is covered with a part of the seal member 19. The switch cover 16 is firmly fixed through the seal member 19 to a stationary core 8 by fastening a bolt 20 with a nut 21. Even when the switch cover 16 is larger than a switch housing 2, the seal member 19 is reliably urged by an end surface of the cover 16 and an end surface of the bush 18 by covering longitudinal opposite ends of a recess 16b of the cover 16 with the bushes 18, thus maintaining the sealability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnet switch for a starter, and particularly aims to improve the sealing performance between a switch cover and a switch housing.

[Prior art] The conventional one is Nippondenso Publication Technical Report number 13-07.
As shown in 5, a sealing member is inserted between the fixed core provided in the switch housing and the switch cover to prevent water from entering the cover through the gap between the switch housing and the switch cover. .

[Problem that the invention seeks to solve]

However, in the conventional type described above, a sealing member is inserted between the end face of the switch cover and the fixed core to provide a seal, so the outer diameter of the switch cover and the outer diameter of the fixed core are almost the same. As the same, it was necessary to ensure a surface for receiving the sealing member.

In addition, in a starter, a large current (
(several tens of amperes), the distance between a pair of fixed contacts must be large, so the size of the switch cover is determined by the current.
It is not possible to reduce the size below a predetermined size.

Therefore, even if an attempt is made to downsize the coil device and the plunger inside the switch housing to downsize the switch housing as a whole, as mentioned above, due to the sealing between the housing and the switch cover, the switch housing will inevitably become smaller than the switch cover. There is a problem that the switch housing cannot be made smaller because the size has to be adjusted accordingly.

Therefore, the present invention maintains the sealing performance between the switch housing and the switch cover even when the switch housing is downsized.

[Means for solving problems]

In other words, the present invention provides a starter magnetic switch for moving the pinion of the starter motor to the ring gear of an internal combustion engine and for supplying current from a power source to the starter motor, which comprises: a cylindrical switch housing; and a retainer whose one end is grounded. A coil device comprising: a coil; an attraction coil having one end connected to the other end of the retention coil; and a bobbin for retaining the retention coil and the attraction coil, the bobbin being provided inside the housing; a fixed iron core that is fixed to the side surface of the bobbin and to the end of the switch housing and has a through hole in its inner periphery; a cylindrical sleeve that substantially contacts the inner periphery of the bobbin of the coil device; a plunger that is movably disposed on the inner periphery of the through hole of the sleeve and the fixed core, has a substantially rectangular movable contact at one end, and is moved by excitation of the coil to move the pinion toward the ring gear; a pair of fixed contacts, one of which is connected to the power supply and the other to the starter motor, and which abuts the movable contact to form a current-carrying circuit from the power supply to the starter motor; a disk portion facing the fixed iron core;
It penetrates this disc part and opens to the fixed core side, houses the front rotary contact inside, and has a pair of fixed contacts at the bottom separated from each other in the longitudinal direction and close to the inner peripheral surface of the short side. a switch cover having a substantially rectangular concave portion provided therein; and a switch cover having a substantially rectangular concave portion, which faces the ends of the pair of fixed contacts, extends along the inner circumferential surface of the short side of the concave portion, and is substantially flush with the surface of the disk portion. a pair of members that cover both longitudinal ends of the recess at a height; and a sealing member provided between the fixed core, the disk portion of the switch cover, and the pair of members. This is a magnet switch for the starter.

〔Effect of the invention〕

As described above, in the present invention, one
By providing a pair of members, the magnetic switch cover can be easily molded in two parts, and the pair of members can reliably press the sealing member, which has the excellent effect of improving sealing performance. be.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings.

In FIG. 1, 1 is a magnet switch, and 2 is a switch housing. This housing 2 includes a cylindrical cylindrical part 2a and a disc-shaped flange part bent inward from one end of this cylindrical part 2a. 2b.

The coil device 3 includes a holding coil 5 and a suction coil 6 wound around a resin bobbin 4 having first and second side surfaces 4a and 4b. Further, the second side surface portion 4b of the bobbin 4
First and second cylindrical portions 4c and 4d are formed on the inner and outer circumferential sides, respectively. Furthermore, the coil device 3
is arranged within the cylindrical portion 2a of the switch housing 2.

A sleeve 7 is made of a non-magnetic material, and is disposed in contact with the inner circumferential surface 2C1 of the flange portion 2b of the switch housing 2 and the inner circumferential surface 4e of the bobbin 4. A collar portion 7a that is bent toward the outer circumference is integrally formed at the end of the sleeve 7.

8 is a fixed iron core, which includes a disk portion 8a disposed on the second side surface portion 4b side of the bobbin 4, and from the inner periphery of this disk portion 8a,
and a cylindrical portion 8b extending along the inner circumferential surface of the sleeve 7. Furthermore, a through hole 8c is formed in the disc portion 8a.

9 is a gasket inserted between the first side surface 4a of the bobbin 4 and the flange 2b of the switch housing 2; 10;
is an O-ring inserted between the collar portion 7a of the sleeve 7 and the disk portion 8a of the fixed core 80.

Then, as shown in FIG. 7, the open end 2d of the switch housing 2 is wound around the outer circumferential side of the disk portion 8a of the fixed iron core 8, thereby fixing the fixed iron core 8 to the switch housing 2 and tightening the winding. When doing so, on the flange portion 2b side of the switch housing 2, the packing 9, the first side surface portion 4a of the bobbin 4, the second side surface portion 4b, the first cylindrical portion 4C, and the collar portion 7a of the sleeve 7. The ring 10 is attached to the fixed core 8.
It is pressed by the disc part 8a. Moreover, by compressing the packing 9.0 ring 10 with this pressing force, the inner circumferential side and the outer circumferential side of the sleeve 7 are separated.

11 is a plunger, and this plunger 11 is movably arranged on the inner periphery of the sleeve 7. Reference numeral 11a denotes a plunger rod, and a movable contact 13 is fixed to one end of the plunger rod lla via an insulating member 12.

14 and 15 are a return spring and a contact pressure spring, respectively.

16 is a switch cover formed by two parts made of resin,
As shown in FIG. 2, a disk portion 16a having an outer circumferential diameter larger than the outer circumferential diameter d of the switch housing 2 and facing the disk portion 8a of the fixed iron core 8, as shown in FIGS. 2 and 4;
A substantially rectangular first recess 1 penetrating this disk portion 16a
6b. This first recess 16b
are an arc-shaped short side inner circumferential surface 16bl and a long side inner circumferential surface 16b2.
, and a bottom portion 16b. In addition, the bottom portion 16b,
A second recess 16c is formed in the center of the recess 16c in which the tip of the plunger 11 is accommodated when the plunger 11 moves.

Further, on the surface of the disk portion 16a and on the inner circumferential surface 16bg of the long side, a pair of first and second storage portions 16d are provided which are recessed with respect to the surface of the disk portion 16a along the inner circumferential surface 16b of the short side. , 16
e is formed.

Further, a hole 16'' is formed in the disc part 16a so as to coincide with the through hole 8c of the disc part 8a of the ground plate 8.

Further, around the hole 16f of the disc part 16a, there are a plurality of protrusions 16 that protrude from the surface of the disc part 16a.
g is integrally formed.

1'7a, 17b are heads 17a+, 17b, respectively.
is a symmetrical chevron shape, and these heads 17al,
17b+ is 1, the first recess 16b of the switch cover 16
They are provided on the bottom portion 16b3 of the inner peripheral surface 16b and close to the inner circumferential surface 16b of the short side, and are spaced apart from each other.

18 is a bushing shown in FIG.
has a circular arc shape along the inner peripheral surface 16b1 of the short side of the recess 16b, and both ends thereof are connected to a pair of storage parts 16d and 1, respectively.
It consists of a member 18a that is housed in substantially abutting contact within the first member 6e, and a pair of legs 18b that extend perpendicularly from the first member 18a. In addition, these pair of legs 18b widen as they reach the tips, and the tips are connected to the inner peripheral surface 16 of the long side of the recess 16b.
It comes into contact with b2.

Then, the bushing 18 connects the member 18a to the first and second parts.
By storing in the pair of storage parts 16d and 16e, the recess 16
The end portion of b (opposing a portion of the first and second fixed contacts 17a and 17b) is covered as shown by the dotted line in FIG. is almost flush with the surface of At this time, the bushing 18 inserts the pair of legs 18b into the recess 16b, so that the pair of legs 18b is inserted into the inner peripheral surface 16 of the long side of the recess 16b.
b2 and a tightening margin to prevent the bushing 18 from coming out from the recess 16b.

The sealing member 19 has a shape that fits over the disk portion 16a of the switch cover 16, as shown in FIG.
A hole 19a is formed at a position relative to the protrusion 16g. When the seal member 19 is placed on the disk portion 16a, a portion of the seal member 19 covers the member 18a of the bush 18. Moreover, the thickness of the seal member 19 is thicker than the height of the protrusion 16g.

Furthermore, the annular portion 19b of the seal member 19 is slightly thinner than the inside due to the step 19C.

Numerals 20, 21, and 22 are bolts, nuts, and washers that constitute fixing means, and the bolt 20 has its head 20a inserted into the switch housing 2 and into the first and second cylindrical parts 4c and 4d of the bobbin 4. The threaded portion 20b passes through the through hole 8C of the stationary core 8 and the hole 16f of the switch cover 16 and projects to the outside of the switch cover 16. After inserting the washer 22 into the threaded portion 20b, the switch cover 16 is pressed and fixed to the stationary core 8 side via the seal member 19 by tightening the screw with the nut 21. At this time, the open end 2d of the housing 2 is placed on the annular portion 19b of the seal member 19, as shown in FIG.

23a and 23b are the bolt 20 and the stay gonary core 8.
They are a cylindrical first insulating bushing and a disc-shaped second insulating bushing for insulating the two.

Then, as shown in FIG. 7, the bolt 20 and the first and second
insulation bushings 23a, 23b and switch cover 1
A predetermined gap is provided between the hole portion 16f of No. 6 and the hole portion 16f of No. 6 so that a first air passage A is formed. Also, Pol)
A groove 2 is formed on the side of the head 20a of the head 20a facing the second insulating bushing 23b so as to form a second air passage B.
Furthermore, a groove 16h is formed on the outer circumferential surface of the disk portion 16a of the switch cover 16 so as to extend to the outer periphery beyond the diameter of the washer 22 and form a third air passage C. That is, the first, second, and third air passages A, B, and C allow the inside of the switch housing 2 to
It forms an air passage communicating with the outside.

A plunger boot 24 is attached to the plunger 11 with a tightening margin, and its outer peripheral portion is sandwiched and fixed between the housing 25 and the switch housing 2.

26 is a lever that engages with the plunger 11.

In addition, in FIG. 4, 27 is the coil 27a and the armature 2.
7b.

28 is a pinion to which rotation of the starter motor 27 is transmitted, and the other end of the lever 26 is engaged.

29 is a ring gear of the internal combustion engine.

Next, referring to FIG. 9, the entire electric circuit of the starter will be explained. The connection point between the holding coil 5 and the suction coil 6 is connected to a battery 31 via a key switch 30. One end of the attraction coil 6 is connected to a coil 27a of the starter motor 27.

Further, the first fixed contact 17a is directly connected to the battery 31, and the second fixed contact 17a is connected to the coil 27a similarly to one end of the attraction coil 6.

Here, as is clear from FIG. 7, the head 2 of the bolt 20
0a includes one end 5a of the holding coil 5 and the suction coil 6.
One end of each is connected.

Then, as shown in FIG. 9, by connecting the battery 31 to this bolt 20 via the key switch 30, the bolt 20 for fixing the switch cover 16 becomes
It also serves as a terminal for supplying power to the holding coil 5 and attraction coil 6.

Although not shown, the other end of the attraction coil 6 is connected to the head of the bolt 20' shown in FIG. 8, as in FIG. 7. Then, the bolt 20' and the second fixed contact 17b are electrically connected by the metal plate 32, and the coil 27a of the starter motor 27 is connected to the second fixed contact 17b as shown in FIG. By doing so, the coil 27 is connected to the other end of the attraction coil 6 via the bolt 20'.
a will be electrically connected.

That is, (a) using the sleeve 7 that allows the plunger 11 to slide smoothly, the seal 9 and the O-ring 10 are
The coil device 3 reliably separates the first space provided in the switch housing 2 and the second space E in which the plunger 11 is arranged.

(b) Furthermore, the first space communicates with the outside via the first, second, and third air passages A, B, and C as described above.

(C) Furthermore, the plunger boot 24 separates the fourth space G and the second space E within the housing 25.

(d) A sealing member 19 is also arranged around the hole 16f of the switch cover 16 to prevent the air flowing outside through the air passage A from penetrating into the air inside the contact cover 16.

In the present invention, the switch housing 2 is made smaller, and the switch cover 16 is made smaller than the switch housing 2.
Even if the size of the recess 16b is larger than that of the cover 16, by covering both ends of the recess 16b in the longitudinal direction with the bushings 18, as shown in FIG. By reliably pressing the sealing member 19, it is possible to improve the sealing performance.

In addition, while aiming to improve sealing performance, the switch cover has two
It can be formed in parts and is easy to manufacture.

Here, in FIG. 9, to briefly explain the operation of the starter, by closing the key switch 30, the battery 3
A current flows from 1 to the holding coil 5 and the attraction coil 6,
The plunger 11 is sucked.

As the plunger 11 moves, the lever 16
The pinion 28 is meshed with the ring gear 29 via.

Further, the movable contact 13 includes first and second fixed contacts 17a,
17b and connects the battery 3 to the starter motor 27.
1 rotates the armature 27b, rotates the pinion 28, and starts the internal combustion engine.

However, when current is supplied from the battery 31 to the holding coil 5 and the suction coil 6, they are heated and harmful gases such as water vapor and gas are generated in the first space. As shown in paragraphs (a) to C), this gas flows through the first, second, and third air passages A, B, without entering the second and third spaces E, F. It passes through C and is discharged to the outside. Therefore, the movable contact 13 and the fixed contact 17 are not corroded by toxic moisture or gas, and the fixed contact 17 is not frozen, so that poor contact between the contacts can be prevented.

In addition, the first space and the second space E can be easily separated by simply providing the sleeve 7 that allows the plunger 11 to slide smoothly and the O-ring 10 between the sleeve 7 and the fixed iron core 8. be able to.

Furthermore, the switch cover 16 is fixed to the housing 2,
In addition, by forming an air passage between the first space and the outside by using the hole for inserting the bolt 20, 20' for supplying current to the holding coil 5 and the attraction coil 6, the air passage can be closed. It is very easy to form.

The plunger boot 24 prevents oil, water, dust, etc. from entering the second space E through the opening (not shown) of the housing 25 where the pinion 28 and ring gear 29 engage. be.

In the above-mentioned embodiment, the two bolts 20 and 20' (one where one end of the holding coil 5 and one end of the suction coil 6 are connected, and the other where the other end of the suction coil 6 is connected) are used. The other end of the holding coil (
(grounded) may be provided separately.

[Brief explanation of the drawing]

1 shows an embodiment of the magnetic switch for a starter according to the present invention. FIG. 2 is a partially sectional front view taken along the line Ii in FIG. 8, and FIG. Figure 3 is an enlarged sectional view of the main parts in Figure 1, Figure 4 is a front view of the switch cover, Figure 5 is a front view of the seal member, Figure 6 is a perspective view of the bushing, and Figure 7 is a front view of the switch cover. 1st
FIG. 8 is a cross-sectional view of the starter magnet switch in FIG. 1;
The figure is a schematic diagram showing one embodiment of a starter. DESCRIPTION OF SYMBOLS 1... Magnetic switch, 2... Switch housing, 2a... Cylindrical part, 2b... Flange part, 3...
... Coil device, 4 ... Bobbin, 5 ... Holding coil, 6 ... Attraction coil, 7 ... Sleeve, 8 ... Fixed core, 11 ... Plunger, 13 ... Movable contact ,
16...Switch cover, L6a-disc part, 16b-
... recess, 16b. ...Short side inner peripheral surface, 16bz...Long side inner peripheral surface, 16b
:+...bottom, 17a, 17b...first and second fixed contacts. 18... Bush, 19... Seal member, 20...
- Bolt 27... Starter motor, 28... Pinion, 29... Ring gear, 30... Key switch, 31... Battery.

Claims (3)

[Claims] (1) A magnetic starter switch for moving the pinion of the starter motor to the ring gear of the internal combustion engine and for supplying current from the power supply to the starter motor, which includes a cylindrical switch housing, a holding coil whose one end is grounded, A coil device including a suction coil whose one end is connected to the other end of the holding coil, and a bobbin that holds the holding coil and the suction coil, the bobbin being provided inside the housing, and a side surface of the bobbin. a fixed iron core fixed to the end of the switch housing on the side and having a through hole in the inner periphery; a cylindrical sleeve that substantially contacts the inner circumferential surface of the bobbin of the coil device; the sleeve and the fixed core; a plunger that is movably arranged on the inner periphery of the through hole of the iron core, has a substantially rectangular movable contact at one end, and is moved by the excitation of the coil to move the pinion toward the ring gear; a pair of fixed contacts, one of which is connected to the power supply, the other of which is connected to the starter motor, and forms a current-carrying circuit from the power supply to the starter motor by contacting the movable contact; A disk portion facing each other, which passes through the disk portion, opens toward the fixed core side, houses the movable contact inside, and has a pair of fixed contacts at the bottom separated from each other in the longitudinal direction, and each inside the short side. a switch cover having a substantially rectangular recess provided close to the circumferential surface; and a switch cover having a substantially rectangular recess provided close to the peripheral surface, facing the ends of the pair of fixed contacts, along the inner peripheral surface of the short side of the recess, and of the disk portion. At approximately the same height as the surface,
a pair of members covering both ends of the recess in the longitudinal direction; the fixed iron core; the disk portion of the switch cover;
A magnet switch for a starter, comprising: a sealing member provided between a pair of members; (2) A pair of storage portions are formed at both longitudinal ends of the recess of the switch cover, into which both ends of the member are inserted and the member is positioned.
Magnetic switch for starters as described in section. (3) The member is provided with a member that abuts the inner peripheral surface of the long side of the recess of the switch cover with a tightening margin and holds the member.
3. The starter magnet switch according to claim 2, wherein a pair of foot portions is formed.