JPH04339173A - Magnet switch for starter - Google Patents

Abstract

PURPOSE:To simplify assembly of a coil housing and a starter case and surely fix a magnet coil. CONSTITUTION:It is provided with a coil housing 12 putting a magnet coil 11 between a gland plate 13 and a locking part 27, and a center case 14 of a starter to fix the coil housing 12, the cylindrical wall part 26 of the coil housing 12 is force-fitted into the inner circumferential wall having a plurality of linear projecting parts formed on the inner circumference of the center case 14, and the magnet coil 11 is surely fixed by simple assembling method.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a magnet switch for a starter that functions to push a pinion gear toward the ring gear side of an internal combustion engine and to open and close a contact provided between a power source and a starter motor. .

0002

[Prior Art] Conventionally, for example, in Nippondenso Technical Report No. 23-015 (issued on July 20, 1981), a pinion gear to which the rotation of a starter motor is transmitted, and a ring gear of an internal combustion engine that connects this pinion gear with A starter is described in which a plunger that pushes out to the side is arranged on the same axis. The plunger is moved toward the ring gear of the internal combustion engine by a magnetomotive force generated when a current flows through a magnet coil wound around a bobbin fitted around the outer periphery of the plunger.

[0003] The method for fixing the magnetic coil to the starter is to first sandwich the magnetic coil between the ground plate, which comes into contact with the center case of the starter and restricts movement in the direction of the pinion gear, and the locking part of the coil housing. In this state, fit the magnet coil into the inner periphery of the cylindrical wall of the coil housing. Then, while pressing the magnet coil toward the ground plate side by the locking part of the coil housing, insert the protrusion formed on the pinion gear side of the cylindrical wall into the notch of the grand plate, and insert the tip of the protrusion into the ground plate. The magnet coil is fixed to the center case by taking it out to the pinion gear side and fixing the tip of the protrusion to the center case by caulking.

0004

[Problems to be Solved by the Invention] However, in the prior art, a method is used in which the protruding part is fixed to the center case by caulking while the magnet coil is pressed against the ground plate side by the locking part of the coil housing. The work is difficult, and since the radially outward side of the coil housing is not regulated, there is a possibility that the coil housing may deform radially outwardly, resulting in incomplete fixation of the magnet coil. SUMMARY OF THE INVENTION An object of the present invention is to provide a magnet switch for a starter that simplifies the assembly of a coil housing and a starter case and can securely fix a magnet coil.

[0005]

[Means for Solving the Problems] The present invention includes a plunger that is disposed on the same axis as a pinion gear to which rotation of a starter motor is transmitted and that pushes out the pinion gear toward a ring gear of an internal combustion engine; A turned magnet coil, a locking part that locks one end of the magnet coil, and a cylindrical wall part that extends in the axial direction from the outer peripheral end of the locking part and is fitted onto the outer periphery of the magnet coil. a coil housing disposed opposite to the locking portion, locking the other end of the magnetic coil, and fixed to the cylindrical wall portion in a state in which the magnetic coil is pressed toward the locking portion; A technical means is adopted that includes a ground plate that has a cylindrical shape and a cylindrical starter case that fixes the coil housing by press-fitting the cylindrical wall portion into the inner circumferential wall.

[0006]

[Operation] The present invention works by fitting the magnet coil to the inner periphery of the cylindrical wall of the coil housing, and then fixing the ground plate to the coil housing while pressing the magnet coil with the ground plate. part is locked with the locking part of the coil housing, and the other end of the magnet coil is locked with the ground plate. Then, the magnet coil is fixed to the starter case by press-fitting the cylindrical wall portion of the coil housing into the inner circumferential wall of the starter case. Note that since the cylindrical wall portion of the coil housing is press-fitted into the inner circumferential wall of the starter case, radially outward deformation of the coil housing is suppressed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The starter magnetic switch of the present invention will be explained based on the embodiments shown in FIGS. 1 to 4. 1 to 3 are diagrams showing a first embodiment of the present invention, and FIG. 1 is a diagram showing a starter for an automobile. An automobile starter 1 includes a starter motor 2 and a starter magnet switch 3. Armature of starter motor 2 (
An idle gear 4 is connected to the drive gear (not shown) via a drive gear (not shown).

A clutch gear 7 is connected to the idle gear 4 for transmitting the rotational force of the starter motor 2 to a pinion shaft 6 via a spline shaft 5. Further, the pinion shaft 6 is provided with a pinion gear 8 at its tip end that meshes with a ring gear (not shown) of the internal combustion engine, and transmits the rotational force of the starter motor 2 to the pinion gear 8. A return spring 9 is provided between the inner circumference of the spline shaft 5 and the outer circumference of the pinion shaft 6 to return the pinion shaft 6 from the moving position to the rest position.

The starter magnetic switch 3 includes a plunger 10, a magnetic coil 11, a coil housing 12, a ground plate 13, and a center case 14.
has. The plunger 10 includes a movable contact 15 and a plunger shaft 16. This plunger shaft 16 is disposed on the same axis as the pinion gear 8, and is provided with a return spring 17 on its outer periphery that returns the plunger 10 from the moving position to the resting position. Further, the plunger shaft 16 is connected to the pinion shaft 6 via a steel ball 18.

The movable contact 15 contacts the fixed contact 20 connected to the terminal bolt 19 when the plunger 10 moves in the pushing direction of the pinion gear 8. This fixed contact 20 contacts the ground plate 13 via an insulating washer 21 and an insulating bush 22.
and the center case 1 via the insulating bush 23.
It is fixed at 4.

The magnet coil 11 consists of a pull-in coil wound with thick wire and a holding coil wound with thin wire and having a weaker magnetomotive force than the pull-in coil.
It is wound around a resin bobbin 24 fitted around the outer periphery of the plunger shaft 16. Note that the magnet coil 11 is held within the coil housing 12, and the ground side terminal 25 is joined to the outer peripheral surface of the coil housing 12 by welding or the like.

[0012] The coil housing 12 is made of magnetic material,
As shown in FIGS. 2 and 3, the cylindrical wall portion 26 and the annular locking portion 27 are formed by press molding. The cylindrical wall portion 26 is a portion that extends in a direction parallel to the plunger shaft 16 and is press-fitted into the inner circumferential wall of the center case 14. The locking portion 27 is connected to the pinion gear 8 of the cylinder wall portion 26.
It is bent from the side end toward the plunger shaft 16 side,
One end of the magnet coil 11 is connected to an elastic member (not shown).
This is the part that locks through.

Note that a take-out hole 28 for taking out the earth-side end 25 of the magnet coil 11 is formed in a part of the locking part 27 at the end of the cylindrical wall part 26 on the pinion gear 8 side. The ground plate 13 is made of a magnetic material and forms a magnetic circuit together with the coil housing 12. This ground plate 13 is connected to the coil housing 12.
The magnet coil 1 is arranged opposite to the cylindrical wall portion 26 of
Lock the other end of 1. Further, the ground plate 13 is fixed to the rear end portion of the cylindrical wall portion 26 of the coil housing 12 by caulking.

The center case 14 is a starter case of the present invention and is made of aluminum die-casting, and includes a front housing 29 and a switch cover 3.
It is connected between 0 and 0. This center case 14 includes bearings 31 and 3 together with a front housing 29.
2, a support wall 33 that rotatably supports the spline shaft 5, and a fixed wall 3 that fixes the coil housing 12.
4, and an annular wall 35 formed between the support wall 33 and the fixed wall 34.

As shown in FIG. 2, on the inner periphery of the fixed wall 34 on the annular wall 35 side, there are a plurality of ridges 36 formed in the axial direction and two adjacent ridges 36. It has a groove portion 37 formed therebetween. On the inner peripheral wall of the plurality of protrusions 36,
The cylindrical wall portion 26 of the coil housing 12 is press-fitted.

A method of fixing this magnetic coil 11 will be explained based on FIGS. 1 to 3. First, the cylindrical magnet coil 11 is inserted into the inner circumferential side of the cylindrical wall portion 26 of the coil housing 12 until one end abuts the locking portion 27, and then the magnet coil 11 is inserted from the other end side using the ground plate 13. While pressing the ground plate 13 toward the locking portion 27 side, press the gland plate 13 onto the cylindrical wall portion 26 of the coil housing 12.
Secure it to the rear end by caulking. Therefore, the magnet coil 11 is housed and held within the coil housing 12. At the same time, the ground side terminal 25 of the magnet coil 11 is connected to the extraction hole 2 formed in the coil housing 12.
It is preferable to take it out from 8 to the outer circumferential side of the coil housing 12 and join it to the outer circumferential surface of the coil housing 12 by welding or the like.

[0017]Fixing wall 34 of center case 14
The locking portion 27 abuts the annular wall 35 of the center case 14 on the inner peripheral wall of the plurality of protrusions 36 formed in the cylindrical wall portion 26 in the axial direction from the locking portion 27 side of the coil housing 12. Press in until the At this time, the plurality of protrusions 36 and the plurality of grooves 37 reduce the pressing force of the coil housing 12 compared to a type without grooves 37, so the outer diameter tolerance of the coil housing 12 formed by press molding is reduced. Can be set large. In this way, the coil housing 1
The cylindrical wall portion 26 of No. 2 is connected to the plurality of protrusions 3 of the center case 14.
The coil housing 12 is held by the center case 14 by being fitted into the inner periphery of the coil housing 6 .

At this time, the radially outward deformation of the cylindrical wall portion 26 of the coil housing 12 is restricted by the plurality of protrusions 36 formed on the fixed wall 34 of the center case 14, so that the coil housing The radially outward deformation of the cylindrical wall portion 26 of No. 12 is suppressed. As a result, the magnet coil 11 can always be fixed at a predetermined position. Also,
Since the coil housing 12 and the center case 14 can be assembled by a simple press-fitting operation, the number of assembly steps can be reduced.

FIG. 4 is a diagram showing a second embodiment of the present invention.
FIG. 3 is a diagram showing the main parts of a starter magnet switch. In this embodiment, the fixed wall 34 of the center case 14
The protrusion 36 and the groove 37 are eliminated from the inner periphery of the center case 14 , and the protrusion 38 and the groove 39 are formed on the outer periphery of the cylindrical wall 26 of the coil housing 12 .
4, the cylindrical wall portion 26 of the coil housing 12 is press-fitted into the coil housing 12. This embodiment also has the same effects as the first embodiment.

[0020]

According to the present invention, since the starter case and the coil housing are fixed by press-fitting, at least one caulking process can be reduced, so that the assembly work can be simplified. Furthermore, since radial outward deformation of the coil housing can be suppressed when the coil housing is fixed to the starter case, the magnet coil can be securely fixed.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a starter for an automobile according to a first embodiment.

FIG. 2 is a sectional view taken along line AA in FIG. 1;

FIG. 3 is a sectional view showing the main parts of the starter magnet switch according to the first embodiment.

FIG. 4 is a sectional view showing the main parts of a starter magnet switch according to a second embodiment.

[Explanation of symbols]

1 Automotive starter 2 Starter motor 3 Starter magnet switch 8 Pinion gear 10 Plunger 11 Magnet coil 12 Coil housing 13 Grand plate 14 Center case (starter case) 26 Cylinder wall 27 Locking part

Claims (1)

[Claims] Claim 1: (a) a plunger disposed on the same axis as a pinion gear to which the rotation of the starter motor is transmitted and for pushing the pinion gear toward the ring gear of the internal combustion engine; (b) a plunger wound around the outer circumference of the plunger; (c) a locking portion that locks one end of the magnet coil; and a cylindrical wall portion that extends in the axial direction from the outer peripheral end of the locking portion and is fitted onto the outer periphery of the magnet coil. (d) disposed facing the locking portion, locking the other end of the magnetic coil, and pressing the magnet coil toward the locking portion, the cylindrical wall; and (e) a cylindrical starter case that fixes the coil housing by press-fitting the cylindrical wall part into an inner circumferential wall.