JP2008041525A - Magnet switch for starter motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnet switch in which a terminal plate is molded integrally in an end cover and an abrasion of a connecting part between the terminal plate and an external power source can be prevented and furthermore water ingress from a soldered part can be prevented even though the terminal plate and a coil terminal are connected by soldering outside. <P>SOLUTION: The terminal plate 7 is integrally formed with the end cover 12 and the terminal plate 7 and the coil terminal 6 are connected by soldering outside and an outer portion of a soldered part 12h exposed outside is sealed by a sealing agent 12i to avoid water ingress and to improve waterproofness. Since the terminal plate is formed integrally in the end cover, an abrasion of the connecting part between the terminal plate and the external power source can be prevented and furthermore water ingress from the soldered part can be prevented even though the terminal plate and the coil terminal are connected by soldering outside. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention belongs to the technical field of a magnet switch for a starter motor for starting an engine.

Generally, in a magnet switch for a starter motor, it is necessary to connect a coil terminal and a terminal plate in order to supply power to the exciting coil unit. Conventionally, the coil terminal and the terminal plate are in a straight line state. After soldering, the end cover was assembled to the yoke opening end in a state where the linear terminal plate penetrates the through hole in the through hole formed in the end cover (for example, Patent Document 1). However, in this case, a rubber seal material is provided in the end cover through hole in order to prevent water from entering from the end cover through hole portion through which the terminal plate penetrates. There is a problem of wear.
On the other hand, a terminal plate is formed by insert molding, the terminal plate is integrated to form an end cover as a direct coupler, and the end cover is assembled to the yoke opening end (for example, Patent Document 2). reference).
JP 2005-32641 A JP-A-8-129948

  However, when the terminal plate is insert molded into a direct coupler, the coil terminal and the terminal plate cannot be soldered and connected before the end cover is assembled to the yoke. After the end cover is assembled to the yoke opening end while allowing the coil terminal to pass through the through hole, the coil terminal that passes through the through hole and is exposed to the outside and one end portion of the substantially L-shaped terminal plate are formed. The connection must be made by soldering from the outside, and as a result, the soldering part is exposed to the outside, so that the exposed soldering part is immersed between the end cover and the terminal plate. Thus, there is a problem that the terminal plate is corroded to cause a conduction failure, and there is a problem to be solved by the present invention.

The present invention has been created in view of the above-described circumstances in order to solve these problems. The invention of claim 1 includes a yoke, and a movable contact body provided on the yoke so as to freely advance and retract. An end cover assembled to one end of the yoke, a pair of fixed contact members provided on the end cover, which are in contact with the movable contact so as to be detachable and connected to each other, and the movable contact member to move forward and backward In a magnet switch for a starter motor configured to include an excitation coil unit provided on a yoke, a coil terminal drawn from the excitation coil unit is provided integrally with an end cover to supply power to the excitation coil unit. When electrically connecting to one end of a substantially L-shaped terminal plate connected to an external terminal, the end cover and the end cover A through-hole through which the coil terminal penetrates by assembling the coil terminal, soldered and connected to the coil terminal and one end of the terminal plate externally, and exposed to the outside of the soldered part Is a magnet switch for a starter motor, which is sealed with a sealing agent.
The invention according to claim 2 is characterized in that a cylindrical eyelet is provided in the through hole, and the coil terminal and the terminal plate penetrating the eyelet are soldered and connected at the eyelet part. This is a magnet switch.

According to the first aspect of the present invention, since the terminal plate is formed integrally with the end cover, it is possible to prevent the connection portion between the terminal plate and the external power source from being worn, and further, the terminal plate and the coil terminal are externally soldered. While being connected by soldering, it is possible to prevent water from entering from the soldering portion.
According to the invention of claim 2, the terminal plate and the coil terminal can be easily soldered via the eyelet.

  Next, embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a magnet switch incorporated in a starter motor, which is configured by winding a coil 4 around a ring-shaped coil bobbin 3 around the inner periphery of a bottomed cylindrical yoke 2 constituting the magnet switch 1. The exciting coil unit 5 is integrally provided. A coil terminal 6 is connected to an external power source to supply power to the coil 4. The coil terminal 6 is one end of an L-shaped terminal plate (switch terminal) 7 as will be described later. 7a is connected by soldering.

  A through-hole 2b communicating with the cylindrical hole 5a of the exciting coil unit 5 is formed in the bottom 2a of the yoke 2, and a plunger unit 8 is provided in a state of passing through the holes 5a and 2b so as to freely advance and retract. The plunger unit 8 includes a substantially cylindrical plunger main body portion 8a, an engagement piece portion 8b formed to project from one end surface of the plunger main body portion 8a toward one end side, and the other end surface from the other end surface of the plunger main body portion 8a. The support shaft 8c is provided integrally so as to protrude toward the side, and the movable contact 8d is provided integrally and insulatively at the tip of the support shaft 8c. The movable contact 8d is formed in a substantially rectangular shape that is long in the radial direction, and is formed so as to have a contact surface in the radial direction portion of the support shaft 8c.

  On the other hand, 9 is an end plate which is provided at the opening end 2c by being abutted against the opening end 2c of the yoke 2 in which the exciting coil unit 5 is housed. 9a is opened, and the support shaft 8c of the plunger unit 8 is set to pass through the through-hole 9a so that the plunger unit 8 can move forward and backward. As a result, the movable contact 8d provided at the tip of the plunger unit support shaft 8c. Is set so as to be positioned on the opening end 2c side of the yoke 2.

  Further, an urging ammunition 10 is interposed between the end plate 9 and the plunger unit 8 so as to urge the plunger unit 8 toward one end side. The plunger unit 8 receives the urging force of the urging ammunition 10 in a non-operating state where the excitation coil unit 5 is not energized, and the movable contact 8d is positioned at the non-operating position on the other end side of the end plate 9. Is set to From this state, when the exciting coil unit 5 is energized and the coil 4 is excited, the plunger unit 8 has the other end of the plunger body 8a against the urging force of the urging ammunition 10. The movable contact 8d is set so as to be displaced to an operation position that protrudes toward one end side (direction away from the end plate 9).

  The engaging piece 8b of the plunger unit 8 is connected to one end 11a of the operating arm 11, but the intermediate portion of the operating arm 11 is pivotally supported on the starter motor (not shown). Yes. As the movable contact 8d is displaced to the operating position, the operating arm 11 is oscillated and displaced, whereby a pinion gear (not shown) provided on the starter motor side is moved and a ring gear (not shown) on the engine side is moved. )).

  On the other hand, reference numeral 12 denotes a bottomed cylindrical end cover (switch cover) provided in a sealing manner on the opening end 2c of the yoke 2, and the end cover 12 is integrally formed of an insulating resin material and has an opening. The end portion 12a is provided in a sealed state in a state of facing the outer periphery of the end plate 9 so that the end plate 9 can be disposed on the other end side of the yoke 2 on the opening end portion 2c side. And a switch chamber R partitioned by the end cover bottom 12b.

  Further, a pair of through holes 12d and 12e is formed in the end cover bottom 12b, and a first bolt (first bolt) as a contact member to which a lead wire connected to the motor unit (not shown) is connected to one through hole 12d. A contact member 13 is provided in a penetrating manner, and the other through hole 12e is connected to a battery-side lead wire (not shown), and a second bolt (second contact member) 14 as a contact member to which battery power is supplied. Is provided in a penetrating manner. First and second fixed contacts 13a and 14a are integrally provided at one end portions of the first and second contact members 13 and 14 projecting toward the switch chamber R, respectively. The two fixed contacts 13a and 14a are disposed so as to face the upper and lower contact surfaces of the movable contact 8d, and come into contact with the displacement of the movable contact 8d to the operating position, so that the first and second contacts It is set to conduct between the contact members 13 and 14.

  The end cover bottom 12b is formed with a through hole 12c that penetrates the coil terminal 6 drawn out from the exciting coil unit 5, and a cylindrical eyelet 12f made of a conductive metal is fitted in the through hole 12c. The coil terminal 6 penetrates the eyelet 12f in a loose fit. The L-shaped terminal plate 7 is embedded in the end cover 12 by insert molding, but the terminal plate one end portion 7a is an outer hole end portion having a large diameter of the through hole 12c. Thus, it is externally fitted to the eyelet 12f and exposed to the outside in a state of being supported by contact with the folded end 12g of the eyelet 12f. The eyelet 12f, the coil terminal 6, and the terminal plate one end portion 7a are electrically connected by a soldering portion 12h soldered from outside in the outer hole end portion of the through hole 12c, and the outer hole end portion of the through hole 12c is The outer surface part of the soldering part 12h is covered and sealed with a sealing agent 12i made of a resin such as an epoxy resin in a waterproof state. The other end portion 7b of the terminal plate 7 is exposed (projected) to reach a connector portion (coupler) 12j formed on the end cover.

  In the magnet switch 1 configured as described above, when the exciting coil unit 5 is excited and is in an operating state, the movable contact 8d displaced to the operating position is brought into contact with the first and second fixed contacts 13a and 14a, and is conducted. As a result, power from the battery is supplied to the first contact member 13 side via the second fixed contact 14a, the movable contact 8d, and the first fixed contact 13a, so that power is supplied to the motor unit. Is set to At the same time, as described above, the operating arm 11 swings in conjunction with the displacement of the movable contact 8d to the operating position, and the engine is started.

  In the embodiment of the present invention configured as described above, a terminal plate 7 having a substantially L-shape is integrated with the end cover 12 by insert molding, and a connector portion 12j from which the other end 7b of the terminal plate protrudes. After the end cover 12 is assembled to the yoke opening end 2c, the coil terminal 6 penetrating the eyelet 12f and the terminal plate one end portion 7a are connected to the eyelet 12f. The outer surface portion of the soldering portion 12h between the coil terminal 6 and the terminal plate one end portion 7a is connected to the outer hole end of the through hole 12c. As a result of being sealed and sealed with a sealing agent 12i made of a resin such as an epoxy resin in a state of filling in the part, intrusion of water from here is also avoided, It will have high aqueous.

Incidentally, the present invention is not limited to the above-described embodiment, and the sealant that seals the outer surface exposed to the outside of the soldering portion that connects the coil terminal and one end of the terminal plate is a rubber seal or the like. A material that can be easily attached can be used. By doing so, the work load can be reduced and the sealing performance can be improved.
Furthermore, as the sealing agent, for example, by selecting a resin having flexibility according to the operating temperature range such as a silicone resin or a fluororesin, it is possible to further ensure the sealing performance.

It is the side view which carried out the partial cross section of the magnet switch. It is a front view of a magnet switch. It is a cross-sectional side view of an end cover part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnet switch 2 Yoke 5 Excitation coil unit 6 Coil terminal 7 Terminal plate 7a One end part 7b Other end part 8d Movable contact 12 End cover 12b End cover bottom part 12c Through-hole 12f Eyelet 12h Soldering part 12i Sealing agent

Claims (2)

A pair of yokes, a movable contact body provided on the yoke so as to be movable back and forth, an end cover assembled on one end of the yoke, and a pair of conductive contacts that are provided on the end cover and are in contact with the movable contact in a detachable manner. In a magnet switch for a starter motor configured to include a fixed contact body and an exciting coil unit provided in a yoke to move the movable contact body forward and backward,
A coil terminal drawn from the exciting coil unit is provided integrally with the end cover, and is electrically connected to one end of a substantially L-shaped terminal plate connected to an external terminal to supply power to the exciting coil unit. When connecting,
The end cover is provided with a through-hole through which the coil terminal passes by assembling the end cover and the yoke. A magnet switch for a starter motor, wherein an outer surface portion of a soldering portion to be sealed is sealed with a sealant.   2. A magnet switch for a starter motor according to claim 1, wherein a cylindrical eyelet is provided in the through hole, and a coil terminal and a terminal plate penetrating the eyelet are soldered and connected at the eyelet part.

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