JP2014044861A - Electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic relay 2 for a motor, capable of enhancing safety by making a resistive element 17 be melted at a predetermined part in such a case that an excessive current flows in the resistive element 17, and of improving processability and moldability of the resistive element 17.SOLUTION: An electromagnetic relay 2 for a motor comprises: a resistive element 17 for suppressing an initiation current flowing at activation of a motor 3; a relay contact point for bypassing the resistive element 17 and connected to a motor circuit; and a solenoid for opening and closing the relay contact point. The electromagnetic relay 2 can switch between a first energization path where the initiation current of the motor 3 flows in the resistive element 17 when the relay contact point is opened, and a second energization path bypassing the resistive element 17 when the relay contact point is closed. The resistive element 17 is processed to be folded arcuately so that a part between one end part 17a and the other end part 17b are curved at a substantially constant curvature, and at least one or more notch parts 17c are formed between the one end part 17a and the other end part 17b.

Description

  The present invention relates to an electromagnetic relay that is provided in a current circuit for flowing a current to a motor of a starter and has a built-in resistor for suppressing a starting current that flows when the motor is started.

Conventionally, in a starter for starting an engine, a large current (generally called a starting current or an inrush current) flows from the battery to the motor when the motor is started, that is, when the electromagnetic switch closes the main contact. For this reason, a so-called “instantaneous interruption” phenomenon may occur in which the terminal voltage of the battery is greatly reduced, and electric devices such as meters and audio are instantaneously stopped.
On the other hand, the present applicant has proposed a technique capable of preventing the occurrence of “instantaneous interruption” by suppressing a large current (hereinafter referred to as a starting current) that flows when the motor is started (see Patent Document 1).

  In Patent Document 1, a motor electromagnetic relay is provided in a current circuit of a motor separately from an electromagnetic switch mounted on a starter. The electromagnetic relay for motor includes a resistor that suppresses the starting current, a relay contact that bypasses the resistor and is connected to the current circuit of the motor, and a solenoid that opens and closes the relay contact. When the motor is started, the solenoid opens a relay contact, and a current flows from the battery to the motor via the resistor, so that the starting current of the motor is suppressed. After starting the motor, the solenoid closes the relay contact to form a short circuit that bypasses the resistor, so that the entire voltage of the battery is applied to the motor and the motor rotates at high speed.

JP 2009-224315 A

  By the way, since the electromagnetic relay for motors described in Patent Document 1 has a resistor disposed in a limited space formed inside the resin cover, an excessive current flows through the resistor for some reason. In this case, or when a current continues to flow through the resistor due to continuous energization, the resistor becomes red hot and becomes an abnormally high temperature. In this case, the resin parts including the cover may be thermally damaged. An excessive current means a current larger than the starting current of the motor.

Further, in order to give a predetermined resistance value within a limited space in the cover, it is necessary to adjust the length by bending the resistor, so a large load is required for bending the resistor. Therefore, the processability and moldability are poor, and the problem of lowering productivity is also included.
The present invention has been made based on the above circumstances, and its purpose is that the resistor is blown at a predetermined site when an excessive current flows through the resistor or when continuous current is applied. Another object of the present invention is to provide an electromagnetic relay capable of avoiding thermal damage to a resin cover and the like and improving the workability and moldability of a resistor.

(Invention of Claim 1)
The present invention is connected to a current circuit through which a current flows from a battery to a motor, a resistor for suppressing a starting current that flows when the motor starts, a relay contact that bypasses the resistor and is connected to the current circuit, It has a built-in relay coil that forms an electromagnet when excited, and a solenoid that opens and closes a relay contact according to the excitation / de-energization of this relay coil. This solenoid opens the relay contact so that the starting current of the motor is a resistor. An electromagnetic relay that switches between a first energization path that flows through and a second energization path that closes the relay contact and bypasses the resistor, wherein the resistor has one or more notches. It is characterized by.

According to the above configuration, by forming the notch in the resistor, the cross-sectional area of the portion where the notch is formed is reduced, so when an excessive current flows through the resistor at the start of the motor, Alternatively, when a current continues to flow through the resistor due to continuous energization, the resistor melts at a site where the notch is formed due to Joule heat generated in the resistor. That is, the role of a fuse can be provided by forming a notch and partially reducing the cross-sectional area of the resistor. As a result, even if an excessive current flows through the resistor, the state where the resistor is heated to an abnormally high temperature is not continued, and the resistor is melted at a predetermined portion, so that the motor can be fed. Stopped.
Further, when a resistor is disposed inside a limited space of the electromagnetic relay, it is necessary to adjust the resistance value by bending the resistor to a predetermined length. In contrast, in the present invention, by forming one or more notches in the resistor, the resistor can be bent with a low load. As a result, the processability and formability of the resistor are improved. The resistance value can be easily adjusted.

(Example 1) which is sectional drawing of the electromagnetic relay for motors. (Example 1) which was the top view which looked at the resin cover which has arrange | positioned the resistor from the inner side. It is an electric circuit diagram of a starter. (Example 2) which is sectional drawing of the electromagnetic relay for motors. (Example 3) which was the top view which looked at the resin cover which has arrange | positioned the resistor from the inner side. (Example 3) which was the top view which looked at the resin cover which has arrange | positioned the resistor from the inner side. (Example 4) which was the top view which looked at the resin cover which has arrange | positioned the resistor from the inner side.

  The mode for carrying out the present invention will be described in detail with reference to the following examples.

Example 1
The first embodiment is an example in which the electromagnetic relay of the present invention is disposed in the motor circuit of the starter 1, and the electromagnetic relay is hereinafter referred to as a motor electromagnetic relay 2. Note that the motor circuit of the starter 1 is an electric circuit for causing a current to flow from the battery B to the motor 3 of the starter 1 shown in FIG.
First, the configuration of the starter 1 will be described.
As shown in FIG. 3, the starter 1 includes a motor 3 that is supplied with electric power from the battery B and generates a rotational force on the armature 3 a, an output shaft 4 that is driven by the motor 3 and rotates, and the output shaft 4 The pinion 6 is arranged so as to be movable integrally with the clutch 5 on the shaft, and the clutch 5 and the pinion 6 are pushed in the counter-motor direction (right direction in the drawing) with respect to the output shaft 4, and the main contact provided in the motor circuit It consists of an electromagnetic switch 7 and the like for opening and closing (described later).

The motor 3 includes a field element (not shown) formed of a permanent magnet or an electromagnet, an armature 3a having a commutator 3b on the shaft, a brush 8 disposed on the outer periphery of the commutator 3b, and the like. This is a known commutator motor. A reduction device (for example, a planetary gear reduction device) that reduces the rotation of the motor 3 may be provided between the motor 3 and the output shaft 4.
The clutch 5 is configured as a one-way clutch that is helically splined on the shaft of the output shaft 4 and transmits the rotation of the output shaft 4 to the pinion 6, while interrupting power transmission from the pinion 6 to the output shaft 4. The
The pinion 6 is pushed in the counter-motor direction integrally with the clutch 5 by the operation of the electromagnetic switch 7 and meshes with the ring gear 9 of the engine, and then the rotational force transmitted through the clutch 5 is transmitted to the ring gear 9 to transmit the ring gear 9. 9 is driven to rotate.

As shown in FIG. 3, the electromagnetic switch 7 includes an excitation coil 11 that forms an electromagnet when the starter relay 10 is turned on and is excited by the battery B, and an inner periphery of the excitation coil 11 in the axial direction (left and right in the drawing). When the plunger 12 is attracted and moved by the electromagnet, the main contact is closed (turned on) in conjunction with the movement of the plunger 12 and the shift lever 13 is used. The pinion 6 is pushed together with the clutch 5 in the direction opposite to the motor.
The main contact includes a fixed contact 14 connected to the high potential side (battery B side) of the motor circuit via a B terminal bolt (not shown) and a low voltage of the motor circuit via an M terminal bolt (not shown). The fixed contact 15 is connected to the potential side (motor 3 side) and the movable contact 16 is electrically connected between the fixed contacts 14 and 15 in conjunction with the movement of the plunger 12.

  Next, the structure of the electromagnetic relay for motor 2 will be described in detail with reference to FIGS. As shown in FIG. 3, the motor electromagnetic relay 2 is arranged on the high potential side of the motor circuit from the main contact of the electromagnetic switch 7, and a resistor 17 that suppresses a starting current that flows when the motor 3 is started, and this resistor 17 is provided with a relay contact (to be described later) connected to the motor circuit by bypassing 17 and a solenoid (to be described below) for opening and closing the relay contact. 3 can be switched between a first energization path through which the starting current 3 flows through the resistor 17 and a second energization path that closes (turns on) the relay contact and bypasses the resistor 17.

  As shown in FIG. 1, the solenoid has a bottomed cylindrical solenoid case 18 having a bottom surface 18 a on one end side (the left side in the drawing) in the axial direction and an opening on the other end side in the axial direction, and the inside of the solenoid case 18. A relay coil 19 that forms an electromagnet by excitation, a movable iron core 20 that is movable in the axial direction on the inner periphery of the relay coil 19, a shaft 21 that is movable integrally with the movable iron core 20, and a movable iron core 20. The fixed iron core 22 arranged opposite to the axial direction, the return spring 23 for urging the movable iron core 20 in the anti-fixed iron core direction (the left direction in the figure), and the solenoid case 18 are closed and fixed to the solenoid case 18. Resin cover (hereinafter referred to as resin cover 24).

The solenoid case 18 is manufactured by drawing, for example, and has an inner diameter slightly larger on the other end side than an inner diameter on one end side in the axial direction in which the relay coil 19 is accommodated. That is, the thickness on the other end side that opens is slightly thinner than the thickness on the one end side in the axial direction, and a step is formed on the inner peripheral surface of the solenoid case 18 by the difference in thickness.
Further, the bottom surface 18a of the solenoid case 18 is provided with a convex bottom portion 18b protruding outward in the axial direction (the left side in the drawing) at the center in the radial direction, and formed on a metal plate such as iron on the outer periphery of the convex bottom portion 18b. A bracket 25 is disposed. The bracket 25 is a mounting plate for mounting the motor electromagnetic relay 2 to the vehicle side (for example, the housing of the starter 1), and is firmly fixed to the bottom surface 18a of the solenoid case 18 by welding or the like.

The relay coil 19 is wound around a resin bobbin 26 and has one end connected to a terminal terminal 27 (see FIG. 3) and the other end connected to a ground potential via a solenoid case 18. Yes. The tip end side (anti-coil side) of the terminal terminal 27 is drawn out of the resin cover 24 through a slit-like through hole 28 (see FIG. 2) formed in the resin cover 24, and as shown in FIG. It is connected to an ECU 29 that electronically controls the operation of the starter 1.
The movable iron core 20 is formed with a concave portion whose center is recessed on both end faces in the axial direction, and a vertical cross-sectional shape cut in the axial direction through the center in the radial direction is provided in an H-shape shown in FIG.
Between the movable iron core 20 and the bottom surface of the convex bottom portion 18b provided in the solenoid case 18, for example, a spacer 30 that is a non-magnetic material such as resin or rubber is disposed.

The shaft 21 is formed of a resin member separate from the movable iron core 20, and a flange portion 21 a provided at an end portion on one end side is fitted in a recess formed on the end surface of the movable iron core 20. The other end side of the shaft 21 protrudes to the internal space of the resin cover 24.
The fixed iron core 22 is inserted in the inner periphery of the bobbin 26 and is arranged in the radial direction adjacent to the core cylindrical portion 22a arranged on the side opposite to the spacer of the movable iron core 20 and the other axial end side of the relay coil 19. The coil side end surface of the outer diameter portion of the iron core plate portion 22b is in contact with the step of the solenoid case 18 so that the position on the axial coil side is regulated.
The fixed iron core 22 does not necessarily have to be integrally provided with the iron core cylindrical portion 22a and the iron core plate portion 22b. The two are provided separately and mechanically coupled so that a continuous magnetic path is formed. You may do it.

The return spring 23 is disposed on the outer periphery of the shaft 21, and one end in the axial direction is supported by the flange portion 21a of the shaft 21, and the other end is inserted into the inner periphery of the core cylindrical portion 22a. It is supported on the direction end face. As a result, the shaft 21 moves in the axial direction integrally with the movable iron core 20 when the flange portion 21 a receives the load of the return spring 23 and is pressed against the movable iron core 20.
The cylindrical guide portion 31 is provided integrally with a resin plate member 32 disposed in close contact with the surface on the side opposite to the coil of the iron core plate portion 22b, and is slidably fitted to the outer periphery of the shaft 21, It guides the axial movement of the shaft 21.

  As shown in FIG. 1, the resin cover 24 has a cylindrical cover body portion 24 a that opens at one end side in the axial direction, and the front end side of the cover body portion 24 a is inserted into the inner periphery of the opening portion of the solenoid case 18. In addition, the cover body 24a is assembled in a state where the front end surface of the cover body portion 24a is in contact with the outer diameter side end surface of the iron core plate portion 22b on the opposite coil side (the right side in the figure). The end of the solenoid case 18 is caulked and fixed. Further, a seal member 33 such as an O-ring is mounted on the outer peripheral surface of the cover body portion 24a inserted into the inner periphery of the solenoid case 18, and the fitting gap between the resin cover 24 and the solenoid case 18 is sealed in a liquid-tight manner. Has been.

As shown in FIG. 1, the relay contact includes a set of fixed contacts 36 and 37 connected to the motor circuit via two connection terminals 34 and 35 fixed to the resin cover 24, and this set of fixed contacts. A movable contact 38 that electrically connects and disconnects the contacts 36 and 37, and is disposed in the internal space of the resin cover 24 that is partitioned by the plate member 32 at one end in the axial direction.
As shown in FIG. 3, the two connection terminals 34 and 35 are a first connection terminal 34 connected to the positive terminal of the battery B and a second connection connected to the B terminal bolt 14 of the electromagnetic switch 7. Terminal 35. Each of the two connection terminals 34 and 35 has a bolt shape with a thread formed on the outer periphery, and is inserted through a through hole formed in the resin cover 24 and taken out of the resin cover 24. The screw washers 39 and 40 are engaged with the screw threads, respectively, and fixed to the resin cover 24.

The pair of fixed contacts 36 and 37 are electrically and mechanically connected to the first fixed contact 36 and the second connection terminal 35 that are electrically and mechanically connected to the first connection terminal 34. This is a second fixed contact 37. Specifically, circular holes (not shown) are formed in the set of fixed contacts 36 and 37, and the connection terminals 34 and 35 are press-fitted into the circular holes, respectively, so that the terminal heads 34a of the connection terminals 34 and 35 are provided. , 35a and the inner end face of the resin cover 24 are fixed in a sandwiched state.
The movable contact 38 is disposed on the side opposite to the plate member in the axial direction (the right side in FIG. 1) from the pair of fixed contacts 36 and 37, and when the relay coil 19 is de-energized, as shown in FIG. The pair of fixed contacts 36 and 37 are pressed by receiving a load of 41. That is, the electromagnetic relay for motor 2 of the first embodiment is a normally closed contact type in which the relay contact is closed when the relay coil 19 is not excited.

  The shaft 21 has the other end side in the axial direction passing through the cylindrical guide portion 31 and extends from the plate member 32 to the other end side in the axial direction, that is, the internal space of the resin cover 24, and the relay coil 19. As shown in FIG. 1, the tip end surface in the axial direction does not come into contact with the movable contact 38, and a slight gap is secured between the movable contact 38 and the movable contact 38. However, if the contact pressure spring 41 does not affect the contact pressure applied between the movable contact 38 and the pair of fixed contacts 36, 37, that is, if the contact pressure does not decrease, the tip surface of the shaft 21 May be in light contact with the surface of the movable contact 38.

The resistor 17 is, for example, a nichrome wire having a circular cross section, and is disposed in the internal space of the resin cover 24 as shown in FIG. 1, and one end 17 a is a terminal head 34 a of the first connection terminal 34. The other end 17b is electrically and mechanically joined (for example, projection welding) to the terminal head portion 35a of the second connection terminal 35.
Further, as shown in FIG. 2, the resistor 17 is bent into an arc shape with a substantially constant curvature between one end portion 17a and the other end portion 17b. A predetermined gap is provided between the surface and the surface. The resistor 17 has at least one notch 17c (one in FIG. 2) between one end 17a and the other end 17b.

Next, the operation of the starter 1 will be described.
Here, in a vehicle equipped with an idling stop device that automatically controls stop and restart of the engine, the user starts the vehicle after the idling stop is performed and the engine stops or during the deceleration period until the engine stops. An operation when an operation to be performed (for example, a brake release operation, a shift operation to a drive range, etc.) is performed will be described.
When an engine start signal is input by the user's starting operation, the ECU 29 outputs a control signal to the starter relay 10 and the motor electromagnetic relay 2.

  When the starter relay 10 is turned on by a control signal from the ECU 29, the exciting coil 11 of the electromagnetic switch 7 is excited to form an electromagnet, and the plunger 12 is attracted by the electromagnet and moves to the left in FIG. By this movement of the plunger 12, the pinion 6 is pushed out in the counter-motor direction via the shift lever 13 while rotating along the helical spline on the shaft of the output shaft 4 integrally with the clutch 5. Further, the movement of the plunger 12 closes the main contact at substantially the same time as the pinion 6 contacts the ring gear 9 (actually, a slight mechanical delay occurs).

On the other hand, in the motor electromagnetic relay 2, when the relay coil 19 is excited in response to a control signal from the ECU 29, the movable contact 38 opens from the pair of fixed contacts 36 and 37 against the load of the contact pressure spring 41. The relay contact is opened (turned off) by separating.
When the relay contact is opened, the second energization path that short-circuits both ends of the resistor 17 is opened, that is, the first energization path having the resistor 17 is formed. A starting current flows from the battery B to the motor 3. In this case, since a voltage lower than the total voltage of the battery B is applied to the motor 3, the suppressed current is supplied to the motor 3, and the motor 3 rotates at a low speed.

  When the control signal output from the ECU 29 to the motor electromagnetic relay 2 is turned off after the pinion 6 meshes with the ring gear 9 in response to the rotation of the motor 3, the relay contact of the motor electromagnetic relay 2 is closed. A second energization path that short-circuits both ends of the resistor 17 is formed. In this case, since the current flowing from the battery B to the motor 3 flows through the second energization path having a resistance value lower than that of the first energization path having a large resistance value, the entire voltage of the battery B is applied to the motor 3 and the motor 3 3 rotates at a high speed, and the rotation of the motor 3 is transmitted from the pinion 6 to the ring gear 9 to crank the engine.

(Effect of Example 1)
In the motor electromagnetic relay 2 of the present embodiment, at least one notch portion 17c is formed in the resistor 17, so that the cross-sectional area of the portion where the notch portion 17c is formed is small. Therefore, for some reason, when a current that is larger than the starting current of the motor 3 flows through the resistor 17 or when a current continues to flow through the resistor 17 due to continuous energization, Joule heat generated in the resistor 17 The resistor 17 is melted at the site where the notch 17c is formed. That is, by forming the notch 17c and partially reducing the cross-sectional area of the resistor 17, the resistor 17 can have a role of a fuse. As a result, even if an excessive current flows through the resistor 17, the resistor 17 melts at the portion where the notch 17 c is formed, so that power supply to the motor 3 is stopped. Will not continue to flow.

Further, in the conventional product in which the notch portion 17c is not formed in the resistor 17, when an excessive current flows through the resistor 17 and becomes red hot (the temperature of the resistor 17 becomes abnormally high), the surrounding resin parts ( For example, the resin cover 24, the shaft 21, the resin plate member 32, etc.) may be deformed due to thermal damage.
In contrast, the motor electromagnetic relay 2 according to the first embodiment melts at the portion where the notch portion 17c is formed even if an excessive current flows through the resistor 17, so that the resistor 17 becomes red hot and abnormal. The state where the temperature becomes high is not continued, and the surrounding resin parts can be prevented from being thermally damaged, so that safety is improved.

Hereinafter, other Examples 2 to 4 according to the present invention will be described.
Note that components having the same names or components having the same functions as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment.
(Example 2)
The motor electromagnetic relay 2 shown in the second embodiment is an example of a so-called normally open contact type in which the relay contact is opened while the relay coil 19 is not excited.
As shown in FIG. 4, the motor electromagnetic relay 2 has a movable iron core 20 disposed on the right side (the other end side in the axial direction) with respect to the fixed iron core 22, and a return arranged between the fixed iron core 22. The set load of the spring 23 is received and urged toward the anti-fixed iron core (right direction in the figure).

Further, as shown in FIG. 4, when the relay coil 19 is not energized, the relay contact is separated from the pair of fixed contacts 36 and 37 by the movable contact 38 being pressed against the shaft 21.
Similarly to the first embodiment, the resistor 17 is arranged in the internal space of the resin cover 24, one end 17a is joined to the first connection terminal 34, and the other end 17b is the second connection terminal. 35 and at least one notch 17c is formed between one end 17a and the other end 17b.

The ECU 29 (see FIG. 3) that controls the operation of the starter 1 inputs the engine start signal by the user's start operation, and then outputs a control signal to the starter relay 10 (see FIG. 3), and then passes through a predetermined delay time. A control signal is output to the electromagnetic relay 2 for motor.
In this case, in the electromagnetic relay 2 for motor, the relay contact is opened when the relay coil 19 is not excited, that is, the second energization path that bypasses the resistor 17 is opened, and the first relay having the resistor 17 is opened. Therefore, when the electromagnetic switch 7 closes the main contact, the starting current flows from the battery B to the motor 3 through the first energizing path, so that the starting current at the time of starting the motor is suppressed. The

Thereafter, when the relay coil 19 is excited in response to a control signal from the ECU 29, the movable iron core 20 is attracted to the fixed iron core 22 against the urging force of the return spring 23, and is therefore urged by the contact pressure spring 41. The movable contact 38 is in contact with the pair of fixed contacts 36 and 37, and the relay contact is closed. As a result, a second energization path that bypasses the resistor 17 is formed, and the entire voltage of the battery B is applied to the motor 3 through the second energization path.
Also in the normally open contact type motor electromagnetic relay 2 shown in the second embodiment, the same effect as the first embodiment can be obtained by forming the notch portion 17 c in the resistor 17.

(Example 3)
The third embodiment is an example in which a notch portion 17 c is formed in the bending portion of the resistor 17.
In Example 3, the processed part of the resistor 17 having a large curvature is referred to as a bent part.
For example, the resistor 17 described in the first embodiment is bent into an arc that curves with a substantially constant curvature between one end 17a and the other end 17b. The portion that transitions from the arc-shaped curved portion to the arc-shaped curved portion and the portion that transitions from the other end 17b to the arc-shaped curved portion have a larger curvature than the arc-shaped curved portion, that is, the degree of deformation is large. . A processed part having a large degree of deformation and a large curvature is called a bent part.

In Example 3, as shown in FIG. 5, a notched portion 17 c is formed in the bent portion of the resistor 17. That is, the notch portion 17c is formed in the portion that transitions from the one end portion 17a to the arc-shaped curved portion and the portion that transitions from the other end portion 17b to the arc-shaped curved portion. Thereby, since the resistor 17 can be bent with a low load, the workability and formability of the resistor 17 are improved. Note that the notched portion 17c formed in the bent portion does not need to be one, and two or more notched portions 17c may be formed as necessary (FIG. 5 shows two cut portions in the bent portion of the resistor 17). The example which formed the notch part 17c is shown.
Moreover, since the curvature of a bending process part can be easily changed by forming the notch part 17c in a bending process part, as shown in FIG. 6, many bending process parts can also be set, for example. Thereby, since the length of the resistor 17 can be appropriately changed in the limited internal space of the resin cover 24, the resistance value can be easily adjusted.

Example 4
The fourth embodiment is an example in which the resistance value can be identified from the appearance of the resistor 17 by the number of notches 17 c formed in the resistor 17.
For example, when using the resistor 17 having a different resistance value for each model of the electromagnetic relay 2 for motor, if the shape of the bent resistor 17 is the same, the resistance value cannot be identified from the appearance. Therefore, as shown in FIG. 7, if the resistance value can be identified by the number of the notches 17 c formed in the resistor 17, the resistor 17 having a different resistance value when the motor electromagnetic relay 2 is manufactured. Can be prevented from being assembled by mistake.

(Modification)
In the first embodiment, the motor electromagnetic relay 2 is arranged on the upstream side (high potential side) from the main contact of the electromagnetic switch 7, but the downstream side (low potential side) from the main contact, that is, the M terminal bolt 15 and It is also possible to arrange it between the motor 3.

1 Starter 2 Electromagnetic relay for motor (electromagnetic relay)
3 Motor 17 Resistor 17c Notch 18 Solenoid case (bottomed case)
19 relay coil 24 resin cover 34 first connection terminal 35 second connection terminal 36 first fixed contact (relay contact)
37 Second fixed contact (relay contact)
38 Movable contact (relay contact)

Claims (3)

A resistor (17) connected to a current circuit through which current flows from the battery (B) to the motor (3), and for suppressing a starting current flowing when the motor (3) is started;
A relay contact that bypasses the resistor (17) and is connected to the current circuit;
A relay coil (19) that forms an electromagnet by excitation, and a solenoid that opens and closes the relay contact according to excitation / de-excitation of the relay coil (19),
The solenoid opens the relay contact so that the starting current of the motor (3) flows through the resistor (17), and the relay contact closes the resistor (17). An electromagnetic relay that switches between a second energization path to be bypassed,
The electromagnetic relay according to claim 1, wherein the resistor (17) has one or more notches (17c). The electromagnetic relay (2) according to claim 1,
The solenoid has a bottomed case (18) having a bottom surface on one end side in the axial direction and opened at the other end side in the axial direction, and the relay coil (19) accommodated in the bottomed case (18). A movable iron core (20) movable in the axial direction on the inner periphery of the relay coil (19), and the bottomed case opening is closed and fixed to the bottomed case (18). A resin cover (24) for accommodating the relay contacts;
The relay contact is
A first fixed contact (36) connected to the high potential side of the current circuit via a first connection terminal (34) attached to the cover (24);
A second fixed contact (37) connected to the low potential side of the current circuit via a second connection terminal (35) attached to the cover (24);
The movable iron core (20) is configured by a movable contact (38) that is electrically connected between the first fixed contact (36) and the second fixed contact (37) in conjunction with the movement of the movable iron core (20).
The resistor (17) is disposed in the internal space of the cover (24), and one end (17a) is electrically and mechanically joined to the first connection terminal (34), and the other The end (17b) is electrically and mechanically joined to the second connection terminal (35), and is bent between the one end (17a) and the other end (17b). And the notched portion (17c) is formed in the bent portion. The electromagnetic relay (2) according to claim 1 or 2,
The electromagnetic relay according to claim 1, wherein the resistance value of the resistor (17) can be distinguished from the appearance by the number of the notches (17c).

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