JP2003161240A - Starter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce cost by remarkably reducing the number of turns of a relay coil 8a, a holding coil 12 and an attraction coil 11. <P>SOLUTION: A starter relay 8 mounted on an excitation circuit of an electromagnetic switch 8 has the relay coil 8a, a set of relay contacts 8b, and a movable contact 8c: a plus side of the relay coil 8a is connected to the starter switch 19 (IG switch): and its minus side is connected to the holding coil 12 in series through a first external terminal 17. Further the relay contact 8b on plus side is connected to a battery 9, and the relay contact 8b on minus side is connected to the attraction coil 11 through a second external terminal 18. According to this constitution, heat resistance against continuous energization can be obtained by the combined resistance of the resistance of the relay coil 8a and the resistance of the holding coil 12 connected in series, whereby the number of turns can be remarkably reduced in comparison with a conventional relay coil and holding coil. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starter having a starter relay in an excitation circuit of an electromagnetic switch to protect the starter switch. 2. Description of the Related Art Conventionally, a large starter used for a diesel engine or the like, for example, has a large electromagnetic switch for ON / OFF control of a current supplied to a motor as compared with a small starter. Also increases. Therefore, as shown in FIG. 3, a starter relay 200 is used to protect the starter switch 100. The starter relay 200 has a relay coil 210 connected to the starter switch 100 and the starter switch 100.
Is closed and the relay coil 210 is energized, the movable contact 230 comes into contact with a set of relay contacts 220 provided in the excitation circuit of the electromagnetic switch 300 to conduct between the two contacts 220. The 300 excitation coils (suction coil 310 and holding coil 320) are energized. However, in the conventional starter circuit shown in FIG. 3, the relay coil 210 of the starter relay 200 and the holding coil 320 of the electromagnetic switch 300 are separately grounded (earthed). Since independent circuits are formed, the following problems occur. Since it is necessary for the relay coil 210 to have its own heat resistance, the number of turns (the number of turns) is increased with a thin coil. As a result, the cost of the winding material increases, and the number of winding steps increases. [0004] Similarly, the holding coil 320 also needs to have its own heat resistance, so that the number of turns increases. Also,
Suction coil to balance with holding coil 320
We needed to increase the number of 310 turns. The present invention has been made based on the above circumstances, and an object of the present invention is to reduce the number of turns of a relay coil, a holding coil, and a suction coil in a starter having a starter relay in an excitation circuit of an electromagnetic switch, and to reduce costs The idea is to go down. According to the present invention, an exciting circuit of an electromagnetic switch has a starter relay, and an exciting current of the exciting means is supplied through the starter relay.
A starter that is turned on / off, the excitation means includes an attraction coil and a holding coil provided as separate circuits, and the holding coil is connected in series with a relay coil of a starter relay. According to this configuration, heat resistance to continuous energization can be provided by a combined resistance of the resistance of the relay coil and the resistance of the holding coil connected in series. As a result, the number of turns can be reduced as compared with the conventional relay coil and holding coil. Also, since the suction coil and the holding coil are provided in separate circuits, there is no need to balance them, and the number of turns of the suction coil can be set arbitrarily. As a result, the number of turns of the suction coil can be reduced as compared with the related art. Further, since the wire diameter of the relay coil can be increased as much as the resistance of the relay coil can be reduced, there is also an effect that disconnection of the relay coil can be prevented. Also, by connecting the relay coil in series with the holding coil, the operating current flowing through the relay coil can be made larger than before. This allows
Even if leakage current flows through the relay coil for any reason,
As long as the leak current does not exceed the operating current of the starter relay, the starter relay will not be turned on, and the unnecessary operation of the starter can be prevented. Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an electric circuit diagram of the starter 1. A starter 1 according to the present embodiment includes a motor 2 that generates a rotational force, an output shaft 3 that is driven by the motor 2 and rotates, and a pinion gear that is provided on the output shaft 3 so as to move integrally with a one-way clutch 4. And an electromagnetic switch 7 for controlling opening and closing of a main contact 6 provided in an energizing circuit of the motor 2
The excitation circuit of the electromagnetic switch 7 is provided with a starter relay 8. The motor 2 is a known DC motor, and when the main contact 6 is closed by the electromagnetic switch 7, power is supplied from the battery 9 to generate a rotating force on the armature 2a.
The output shaft 3 is connected to a motor rotation shaft (armature shaft) via, for example, a reduction gear (not shown), and the rotation of the armature 2a is reduced and transmitted by the reduction gear. When the engine is started, the pinion gear 5 moves forward (moves rightward in FIG. 1) on the output shaft 3, meshes with the ring gear 10 of the engine, and transmits the rotational force transmitted via the one-way clutch 4 to the ring gear 10. . The electromagnetic switch 7 has an exciting means (attraction coil 11 and holding coil 12) which is energized via a starter relay 8, a plunger 13 which is attracted by a magnetomotive force generated in the exciting means, and the like. The movable contact 14 provided on the plunger 13 contacts the main contact 6 to close the power supply circuit of the motor 2. In addition, the plunger 13
The one-way clutch 4 is connected to the one-way clutch 4 via the lever 15, and moves on the output shaft 3 integrally with the pinion gear 5 as the plunger 13 moves. The exciting means comprises an attraction coil 11 for generating a magnetomotive force required to attract the plunger 13 and a holding coil 12 for generating a magnetomotive force required to hold the attracted plunger 13. However, suction coil 1
1 and the holding coil 12 are provided in separate circuits, respectively, and are connected to the starter relay 8 via external terminals 17 and 18 provided on a switch cover 16 (see FIG. 2) of the electromagnetic switch 7. As shown in FIG. 1, the starter relay 8 includes a relay coil 8a, a set of relay contacts 8b, and a movable contact 8c. When the relay coil 8a is energized, the movable contact 8c is turned on. The relay contacts the pair of relay contacts 8b to conduct between the two contacts 8b. The relay coil 8 a is provided in an energizing circuit for energizing the holding coil 12, the + side is connected to the starter switch 19 (IG switch), and the − side is connected in series with the holding coil 12 via the external terminal 17. I have. One set of relay contacts 8b is provided in an excitation circuit for exciting the attraction coil 11, the + side relay contact 8b is connected to the battery 9, and the-side relay contact 8b
Are connected to the suction coil 11 via the external terminals 18. Next, the operation of this embodiment will be described. When the user turns on the starter switch 19, power is supplied from the battery 9 to the serially connected relay coil 8a and holding coil 12, and the movable contact 8c receives the magnetic force of the relay coil 8a.
Operates. When the movable contact 8c contacts the set of relay contacts 8b and the excitation circuit of the attraction coil 11 is closed, the plunger 13 is attracted by the combined magnetic force of the attraction coil 11 and the holding coil 12, and the lever 15
The one-way clutch 4 connected via the shaft is pushed forward in the axial direction. As a result, the pinion gear 5 advances on the output shaft 3 integrally with the one-way clutch 4 and comes into contact with the ring gear 10. Thereafter, when the movable contact 14 provided in the plunger 13 contacts the main contact 6 to close the energizing circuit of the motor 2, power is supplied from the battery 9 to the motor 2 to generate a rotational force on the armature 2a. The output shaft 3 rotates in response to the rotation of the armature 2a. As a result, the rotation of the output shaft 3 is transmitted to the pinion gear 5 via the one-way clutch 4, and the pinion gear 5 rotates to a position where it can mesh with the ring gear 10 and meshes with the ring gear 10. The torque is transmitted to crank the engine. After the engine is started, when the user turns off the starter switch 19, the relay coils 8 connected in series
a and the holding coil 12 are both deenergized and the movable contact 8
When c separates from the set of relay contacts 8b and opens the excitation circuit of the attraction coil 11, the attraction coil 11 is deenergized. As a result, the plunger 13 is pushed back and the movable contact 14 is separated from the main contact 6, so that the power supply to the motor 2 is stopped and the rotation of the armature 2a is stopped. (Effect of this embodiment) The starter 1 of this embodiment
Are the suction coil 11 and the holding coil 12 of the electromagnetic switch 7
Are provided in a separate circuit, and the holding coil 12 is connected in series with the relay coil 8a of the starter relay 8.
In this configuration, the combined resistance of the resistance of the relay coil 8a connected in series and the resistance of the holding coil 12 can provide heat resistance to continuous energization, so that compared to the conventional relay coil and holding coil, Each can greatly reduce the number of turns. For example, if the battery voltage is 24V
Relay coil 8a: φ0.26, 1245T (number of turns) → φ
0.8, 30T Holding coil 12: φ0.8, 200T → φ0.8, 170T can be reduced respectively. Further, since the suction coil 11 and the holding coil 12 are provided in separate circuits, it is not necessary to balance them, and the number of turns of the suction coil 11 can be set arbitrarily. In other words, in the conventional starter, when the starter relay is turned off after the engine starts (when the main contact is closed), the number of turns of the suction coil and the number of turns of the holding coil are set to the same number to cancel the magnetic force of the holding coil. ing. On the other hand, in the starter 1 of this embodiment,
When the starter switch 19 is turned off, the relay coil 8
Since the energization of the holding coil 12 is stopped together with a, and the magnetic force holding the plunger 13 disappears, the number of turns of the suction coil 11 can be freely set regardless of the number of turns of the holding coil 12. As a result, not only the holding coil 12 but also the number of turns of the suction coil 11 can be reduced as compared with the conventional case (for example, 200T → 170T). In addition, since the wire diameter of the relay coil 8a can be increased as much as the resistance of the relay coil 8a can be reduced, there is also an effect that disconnection of the relay coil 8a can be prevented. Likely). Further, by connecting the relay coil 8a in series with the holding coil 12, the operating current flowing through the relay coil 8a can be made larger than before (for example, 20 to 30A). As a result, even if a leak current (maximum 10 A) flows through the relay coil 8 a for some reason (for example, when the vehicle is submerged), the starter relay 8 is turned ON because the leak current is smaller than the operating current of the starter relay 8. Therefore, the unnecessary operation of the starter 1 can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an electric circuit diagram of a starter. FIG. 2 is an overall view of a starter (a), and a connection diagram (b) of an electromagnetic switch and a starter relay. FIG. 3 is an electric circuit diagram of a starter (prior art). [Description of Signs] 1 Starter 2 Motor 2a Armature 6 Main contact 7 Electromagnetic switch 8 Starter relay 8a Relay coil 11 Attraction coil (excitation means) 12 Holding coil (excitation means)

Claims (1)

Claims: 1. An electromagnetic switch, comprising: a motor for generating a rotational force on an armature; and exciting means comprising a suction coil and a holding coil, for controlling opening and closing of a main contact provided in a current supply circuit of the motor. And a starter relay provided in an excitation circuit for energizing the excitation means, and a starter for turning ON / OFF an excitation current of the excitation means via the starter relay, wherein the excitation means is A starter, wherein a suction coil and the holding coil are provided as separate circuits, and the holding coil is connected in series with a relay coil of the starter relay.