JP2002100273A - Magnet switch for starter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnet switch 1 for a starter which can simplify the assembling process and reduce the manufacturing cost by contriving the configuration of engagement between a plunger 2 and a rod 3. SOLUTION: In a plunger 2, an L-shaped bar 4 is inserted in the direction of an opening part 2a opened on one end side 2b, and is welded to a deep end surface of the opening part 2a. A rod 3 to which a fixed contact 4 is fitted forms an insert groove part 3b and a key hole part 3a. To assemble the plunger 2 and the rod 3, configured like this, together for engagement, the rod 3 is allowed to approach in the direction of one end side 2b of the plunger 2. A key part 4a of the L-shaped bar 4 and an insert groove part 3b of the rod 3 are matched and abutted with each other, and then both are twisted so as to assemble the key part 4a of the L-shaped bar 4 and the key hole part 3a, thus an engagement means of the plunger 2 and the rod 3 is configured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starter magnet switch suitable for use in a starter of an internal combustion engine.

[0002]

2. Description of the Related Art A contact separation type in which a plunger and a movable contact are separated has been conventionally used as a magnet switch of a starter. The movable contact is fixed to the rod, and when the excitation coil is energized, the rod is pushed out together with the plunger, and the movable contact is connected to the fixed contact. At the time of this connection, the two contacts may be welded. If welding occurs, it is impossible to cut off the power supply to the starter motor even if the start switch is turned off. Therefore, when the energization coil is interrupted and the plunger is returned, the fixed contact and the movable contact which are welded are separated by using an engagement means provided between the rod and the plunger.

A configuration of a magnet switch having an engagement means between the rod and the plunger is disclosed in Japanese Patent Laid-Open No. 59-1984.
This is described in JP-A-209235, and FIG. 5 shows its configuration.

The plunger 101 of the magnet switch 100 shown in FIG. 5 has a cylindrical body 101a and a lid 101b.
And the left side (the other end side) of the cylindrical body 101a in the figure.
And a washer 1 serving as a locking member in a hollow portion of the cylindrical body 101a.
02, and then insert the rod 103,
The small-diameter portion 103b of the rod 103 is made to penetrate the inner diameter portion of the rod 103. Then, similarly, from the left in the drawing, the washer holding member 1
05 is inserted so as to hold the end of the washer 102,
The cylindrical body 101a and the lid 101b are joined by welding or the like.

[0005] The small-diameter portion 103b of the rod 103, which protrudes through the opening of the cylindrical body 101a in the right direction (one end side) in the drawing through the above-described steps, is fixed at its distal end side with the movable contact 106 using a nut 104. ing. With such a configuration, the washer 102 and the large-diameter portion 103a of the rod 103 are engaged with each other at the hollow portion of the cylindrical body 101a, thereby forming an engagement means.

[0006]

However, Japanese Unexamined Patent Publication No.
In the magnet switch 100 disclosed in JP-A-209235, the plunger 1 is inserted into the hollow portion of the cylindrical body 101a.
01 and the rod 103 to which the movable contact 106 is fixed, in which the plunger 101 has a divided structure of the cylindrical body 101a and the lid 101b, Assembling from both left (one end side) directions, and the divided cylindrical body 101a
This necessitates an assembling step such as the above, which makes the assembling steps of the magnet switch 100 complicated, which is problematic.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to improve the configuration for engaging the plunger and the rod to simplify the assembly process and reduce the manufacturing cost. An object of the present invention is to provide a possible starter magnet switch.

[0008]

According to a first aspect of the present invention, there is provided a starter magnet switch, comprising: a plunger-side engaging portion formed to be attachable from one end of a plunger; And a rod having a movable contact and a rod-side engaging portion formed to be engageable with the plunger-side engaging portion.

By connecting one end of the plunger having the plunger-side engaging portion to the rod having the rod-side engaging portion, the plunger-side engaging portion and the rod-side engaging portion are connected. An engaging means for engaging between the rod and the plunger when the plunger returns (when the power is cut off) is configured.

Accordingly, it is possible to provide a starter magnet switch which can simplify an assembling process for engaging the plunger and the rod and reduce the manufacturing cost.

According to a magnet switch for a starter according to a second aspect of the present invention, the plunger-side engaging portion is provided at one end of the plunger and provided on the plunger, and the rod-side engaging portion is provided on the rod. The key hole provided has a simple configuration.

Then, the rod is brought into contact with one end of the plunger, and then the two are twisted to assemble the L-shaped bar and the key hole, so that the plunger and the rod constitute engaging means. And

[0013] This makes it possible to provide a starter magnet switch that can reduce the cost of members for engaging the plunger and the rod, simplify the assembly process, and reduce the manufacturing cost.

According to the magnet switch for a starter according to claim 3 of the present invention, the plunger-side engaging portion is a hook member on one end side of the plunger, the distal end provided on the plunger being deformed, and the rod-side engaging portion. Has a simple configuration of a storage portion that can be inserted by deforming a hook member provided on a rod, and after insertion, the hook member returns to its original shape and can be stored.

Then, the rod is brought into contact from one end of the plunger, and the catch member is stored in the storage section,
This is a simplified assembling step in which the plunger and the rod are connected to form the engaging means.

Thus, it is possible to provide a starter magnet switch that can reduce the cost of members for engaging the plunger and the rod, simplify the assembly process, and reduce the manufacturing cost.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall sectional view showing a magnet switch for a starter according to the present invention. The magnet switch 1 shown in FIG. 1 shows a state where the power supply to the exciting coil 8 is cut off and stopped.

The magnet switch 1 includes an exciting coil 8 that is energized when a start switch (not shown) is turned on, a plunger 2 made of a magnetic material attracted by the magnetic force generated by the exciting coil 8, and a battery (not shown). (Not shown) to a starter motor (not shown).

The contact device comprises a movable contact 7 fixed to the rod 3 and fixed contacts 5a, 5b, etc., in which the movable contact 7 moves by a movement amount A and comes into contact with the movable contact 7, and includes a battery (not shown). Is input from the fixed contact 5a, and the fixed contact 5b is connected to a starter motor (not shown).
Connected to

The contact pressure spring 9 applies a contact pressure on the central axis of the rod 3 so that the movable contact 7 and the fixed contacts 5a and 5b surely contact each other. Contact spring 10
Is disposed at a position in contact with the movable contact 7 and on the center axis of the rod 3 so as to face the contact pressure spring 9.
The movable contact 7 is pressed.

The above-described magnet switch 1 has a contact-separated structure in which the movable contact 7 and the fixed contact come into contact by transmitting the movement of the plunger 2 to the rod 3. In order to transmit the movement of the plunger 2 to the rod 3, an opening 2 a that is opened only at one end 2 b of the plunger 2 is provided, and the rod 3 is inserted into the opening 2 a from the direction of the one end 2 b of the plunger 2.

A return spring 6 is disposed between the outer diameter of the rod 3 and the inner diameter of the opening 2a of the plunger 2.
To one side (the left side in FIG. 1).

Here, the L-shaped bar 4 provided in the plunger 2 and the key hole 3a provided in the rod 3 are turned off by the spring force of the return spring 6 when the power to the exciting coil 8 is cut off. In the process of returning to the position, the plunger 2 and the rod 3 are engaged with each other. This engaging means is provided to solve the following problem.

When the movable contact 7 is connected to the fixed contacts 5a and 5b, the two contacts may be welded. When welding occurs, the starter motor (not shown) is energized even if the start switch (not shown) is turned off. You will not be able to shut it off. Therefore, when the energization of the exciting coil 8 is interrupted and the plunger 2 is returned, the movable contact 7 and the fixed contacts 5a and 5b which are welded are separated by using an engaging means provided between the rod 3 and the plunger 2. I have. The configuration of this engagement means will be described later.

Next, the dimensional symbols around the plunger 2 and the rod 3 shown in FIG. 1 will be described. L is the moving distance of the plunger 2, G is the moving distance from the position at rest to the right direction in FIG. 1 until the rod 3 is pushed, and B and C are L-shaped assembled in the key hole 3a. This is a gap distance provided on both sides of the key portion 4a of the bar 4 on the center axis of the rod 3.

Here, B (gap distance between the key hole 3a and the key 4a on the center axis of the rod 3) is set to B ≧ 0. As a result, when the power supply to the exciting coil 8 is cut off and the plunger 2 is stationary, the key hole 3a
Since the spring force of the return spring 6 does not always act on the key portion 4a without interfering with the key portion 4a, the reliability of the L-shaped bar 4 in terms of strength can be ensured.

Next, the structure of the engaging means for engaging the plunger 2 and the rod 3 will be described with reference to FIG. FIG. 2 shows FIG.
FIG. 4 is a partial cross-sectional perspective view showing a configuration of an engagement means between the plunger 2 and the rod 3 of FIG.

The plunger 2 has an L-shaped bar 4 inserted into the plunger 2 from the direction of the opening 2a opened to one end 2b, and is attached to the inner end face of the opening 2a by welding. Here, the attachment of the L-shaped bar 4 is not limited to welding, and may be performed by a screw method, a press-fit method, or the like. The rod 3 to which the fixed contact 4 is fixed has an insertion groove 3b and a key hole 3a.

In order to assemble the plunger 2 and the rod 3 so as to be engaged with each other, the rod 3 is moved closer to one end 2b of the plunger 2. And L-shaped bar 4
The key part 4a of the L-shaped bar 4 and the key hole part 3a are assembled by aligning the key part 4a of the rod 3 with the insertion groove part 3b of the rod 3, and then twisting the two. The rod 3 constitutes an engagement means.

As described above, as the plunger side engaging portion, L
One end 2b of the plunger 2 in which the mold bar 4 is formed, and the rod 3 in which a key hole 3a is formed as a rod-side engaging portion.
Thus, the engagement means is configured such that the plunger-side engaging portion and the rod-side engaging portion engage between the rod 3 and the plunger 2 when the plunger returns (when the power is cut off).

Therefore, the number of parts for engaging the plunger 2 and the rod 3 is small, the assembling process is simplified, and the manufacturing cost can be reduced.

Next, the operation of the above-described configuration will be described with reference to FIGS. FIG. 3 is an operation state diagram of the starter magnet switch of FIG.

When a start switch (not shown) is turned ON as shown in FIG. 3A, the plunger 2 compresses the return spring 6 by the magnetic force generated in the exciting coil 8, and L (moving distance of the plunger 2) is reduced. It is sucked until it reaches zero. Then, G (movement distance from the position when the plunger 2 is at rest to the right direction in FIG. 1 until pushing the rod 3) becomes zero, and the rod after the movable contact 7 and the fixed contacts 5a and 5b come into contact with each other. The contact pressure spring 9 is deflected by a distance D further advanced by 3 and a contact pressure is applied between the movable contact 7 and the fixed contacts 5a and 5b to make A (movement amount of the movable contact 7) zero.

Here, the relationship between C and G shown in FIG.
By setting, the gap distance C provided between the key part 4a of the L-shaped bar 4 and the key hole part 3a is CG (distance obtained by subtracting G from C) at the position where the suction of the plunger 2 is completed. Thus, the key portion 4a and the key hole portion 3a do not come into contact with each other, so that the axial load of the plunger 2 does not act on the L-shaped bar 4.

When the movement distance of the plunger 2 having the above arrangement is L = G + A + D and the suction is completed, a current is supplied from a battery (not shown) to a starter motor (not shown).

FIG. 3B shows a state (1) in which the plunger 2 returns to the original position when the power is cut off. FIG.
(B) shows a state in which the contact between the movable contact 7 and the fixed contacts 5a and 5b remains welded even when the start switch (not shown) is turned off.

In this case, the rod 3 is returned by the spring force of the contact spring 10 by the dimension of D (the distance that the rod 3 travels further after the movable contact 7 and the fixed contacts 5a and 5b abut). G (moving distance from the position when the plunger 2 is stationary to the right in FIG. 1 until the rod 3 is pushed)
Is zero, the gap distance provided between the key portion 4a of the L-shaped bar 4 and the key hole portion 3a is G + B.

FIG. 3C shows a state (2) in which the plunger 2 returns to the original position when the power is cut off. FIG.
3C shows a state in which only the plunger 2 has returned to the original rest position by the LD distance from the state shown in FIG.

Here, the relationship between the moving distance of the plunger 2 and the gap distance G + B provided in the key portion 4a of the L-shaped bar 4 and the key hole portion 3a shown in FIG. 3B is expressed by (G + B) <
By setting (LD), the key portion 4a of the L-shaped bar 4 and the key hole portion 3a are engaged.

By the engagement of the two, the force of returning the plunger 2 to the original rest position by the spring force of the return spring 6 and the collision load generated by the inertial force of the plunger 2 when both are engaged are transmitted to the rod 3. The connection point between the welded movable contact 7 and the fixed contacts 5a, 5b can be cut off.

As described above, the engagement means of the L-shaped bar 4 and the key hole 3a formed on the plunger 2 and the rod 3 is used for the plunger 2 after welding between the movable contact 7 and the fixed contacts 5a and 5b. , And the connection between the movable contact 7 and the fixed contacts 5a, 5b is disconnected to reliably cut off the power supply to the starter motor (not shown).

(Modification) FIG. 4 shows a starter magnet switch according to a modification of the present invention. FIG. 4 is an overall sectional view showing a modification of the starter magnet switch of FIG. Components that are substantially the same as those in the embodiment of FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

The magnet switch 1A shown in FIG. 4 differs from the magnet switch 1 shown in FIG. 1 in the configuration of the engagement means provided on the plunger 2 and the rod 3.

In the plunger 20 of this modification, a hooking member 40 having a hook portion 40a whose tip is deformed from the direction of the opening 2a opened to the one end 2b as a plunger side engaging portion is provided on the inner end surface of the plunger 20. Installed.
The hooking member 40 is formed of an elastically deformable resin material, and is connected to the hooking member 4 from the direction of the opening 2a.
By simply pushing 0, the plunger 20 is elastically deformed and assembled into the groove at the inner end face. The hook member 40 may be elastically deformable, and is not limited to a resin material.

The hook portion 40a of the hooking member 40 can be inserted into the rod 30 as a rod-side engaging portion by deformation, and after insertion, the hook portion 40a of the hooking member 40 returns to its original shape. Thus, a storage portion 30a capable of being stored is constituted.

The storage portion 30a forms a hollow space which is located at the center of the axis of the rod 30 and is long in the axial direction. Thereby, similarly to the magnet switch 1 shown in FIG. 1, the above-mentioned engagement means 30a and 40a are provided with the movable contact 7 and the fixed contact 5a,
The movable contact 7 and the fixed contacts 5a, 5b are engaged only during the return step of the plunger 20 after welding between the two contacts 5b and 5b.
Starter motor (not shown)
Power supply is shut off.

In the practice of the present invention, the plunger 2 has an opening 2a opened at one end 2b as a plunger-side engaging portion, but the shape of the one end 2b of the plunger 2 is flat or convex. Well, plunger 2
And the axial length of the rod 3 side, etc.
It may be configured to engage with the rod 3 side.

[Brief description of the drawings]

FIG. 1 is an overall sectional view showing a starter magnet switch of the present invention.

FIG. 2 is a partial cross-sectional perspective view showing a configuration of an engagement means between a plunger and a rod in FIG. 1;

FIG. 3 is an operation state diagram of the starter magnet switch of FIG. 1; (A) It is an operation state figure showing the state where the plunger was sucked at the time of energization. FIG. 6B is an operation state diagram showing a state (1) in which the plunger returns to the original position when the power is cut off. (C) is an operation state diagram showing a state (2) in which the plunger returns to the original position when power is cut off.

FIG. 4 is an overall sectional view showing a modification of the starter magnet switch of FIG. 1;

FIG. 5 is a partial sectional view showing a conventional starter magnet switch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnet switch 2 Plunger 2b One end side 3 Rod 4 L-shaped bar (plunger side engaging part) 5a, 5b Fixed contact 6 Return spring 7 Movable contact 9 Key hole part (rod side engaging part) 30a Storage part (rod side engaging part) Joint part) 40 Hook member (plunger side engaging part)

Claims (3)

[Claims] 1. A plunger that is sucked when energized, a rod that has a movable contact and is pressed at one end side of the plunger when energized, a return spring that returns the plunger when energized, and a return of the plunger A starter magnet switch that presses the movable contact against a fixed contact when energized, wherein the plunger is formed to be attachable from the one end side. A plunger-side engaging portion; a rod-side engaging portion formed on the rod so as to be engageable with the plunger-side engaging portion; and the one end side of the plunger having the plunger-side engaging portion formed thereon. By connecting the rod on which the rod-side engaging portion is formed, the plunger-side engaging portion and the rod-side engaging portion are engaged with each other. A starter magnet switch, which constitutes a combination means. 2. The plunger-side engaging portion includes an L-shaped bar provided on the plunger at the one end side of the plunger, and the rod-side engaging portion includes a key hole provided in the rod. The rod is brought into contact with the one end side of the plunger, and then the two are twisted to assemble the L-shaped bar and the key hole, and the plunger and the rod constitute the engaging means. The starter magnet switch according to claim 1, wherein: 3. The plunger-side engaging portion is a hooking member that is provided at the one end of the plunger and has a deformable distal end provided on the plunger, and the rod-side engaging portion is provided on the rod. The hook member can be inserted by being deformed, and after the insertion, the hook member is configured to have a storage portion that can be returned to the original shape and housed, and the rod is abutted from the one end side of the plunger, The starter magnet switch according to claim 1, wherein the engagement member is formed by the plunger and the rod when the catch member is stored in the storage portion.