JPWO2018012167A1 - Engine starter - Google Patents

Abstract

To provide a highly reliable engine starter while realizing voltage drop suppression without providing an additional circuit. In order to solve the above problems, an engine starter of the present invention is fitted with an electric motor device, an output shaft that transmits a rotational force from the electric motor device to a ring gear, and slidably mounted on the output shaft. A clutch device to which the rotational force from the output shaft is transmitted, an electromagnet switch device having a plunger that is attracted and driven when the electromagnet is excited, one end engaged with the plunger, and the other end engaged with the clutch device. An engine starter provided with a shift lever, wherein the electric motor device includes a resistor that suppresses a decrease in power supply voltage when the engine of the engine starter is started to a predetermined value. And Specifically, the resistor is constituted by a field winding constituting the electric motor device.

Description

  The present invention relates to an engine starter, and more particularly to an engine starter suitable for an apparatus employing an automobile idle stop system.

  The idle stop system of an automobile is a system that suppresses idle fuel consumption by stopping the engine when the vehicle stops, such as waiting for a signal, and restarting the engine at the start of traveling.

  However, in this idle stop system, there is a problem that the operation of auxiliary equipment (meters, audio, etc.) temporarily stops due to the power supply voltage drop when the engine is restarted at the start of traveling. When a resistor is installed in the middle of the energization circuit from the power source to the starter and the engine is restarted, power supply to the starter through the resistor is restarted to suppress the power supply voltage drop. A technique for preventing the operation of the machine from stopping is known (see Patent Document 1).

JP 2011-142067 A

  However, in the technique described in Patent Document 1 described above, by providing a resistor in the middle of the energization circuit from the power supply to the starter, the power supply voltage drop is suppressed and the operation of the auxiliary equipment temporarily stops. Although this is avoided, new problems arise such as securing the mounting location of the resistor and adding a signal circuit for driving the resistor.

  The present invention has been made in view of the above-described points, and an object of the present invention is to provide a highly reliable engine starting device while realizing voltage drop suppression without providing an additional circuit.

  In order to achieve the above object, the engine starter of the present invention is fitted with an electric motor device, an output shaft that transmits the rotational force from the electric motor device to the ring gear, and slidable on the output shaft, A clutch device to which the rotational force from the output shaft is transmitted, an electromagnet switch device having a plunger that is attracted and driven when the electromagnet is excited, one end engaged with the plunger, and the other end engaged with the clutch device. An engine starter provided with a shift lever, wherein the electric motor device includes a resistor that suppresses a decrease in power supply voltage when the engine of the engine starter is started to a predetermined value. And

  Specifically, the resistor is constituted by a field winding constituting the electric motor device.

  ADVANTAGE OF THE INVENTION According to this invention, while providing a voltage drop suppression, without providing an additional circuit, a reliable engine starter can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing a partially sectioned embodiment of an engine starting device according to the present invention. It is sectional drawing which shows the stator structure of the electric motor apparatus employ | adopted as Example 1 of the engine starting apparatus of this invention.

  The engine starting device of the present invention will be described below based on the illustrated embodiment. In each figure, the same symbols are used for the same components.

  1 and 2 show a first embodiment of an engine starter according to the present invention.

  As shown in the figure, the engine starter 1 of this embodiment is a so-called coaxial engine starter, and transmits a DC motor device 2 and the rotational force from the DC motor device 2 to the ring gear 3 of the internal combustion engine. An output shaft 4, an overrunning clutch device 5 that is slidably fitted on the output shaft 4 in the left-right direction in FIG. 1 and that transmits the rotational force from the output shaft 4, and an electromagnet (not shown) And an electromagnet switch device 7 having a plunger 6 that is attracted and driven when the electromagnet is excited, and a shift lever 8 having one end engaged with the plunger 6 and the other end engaged with the overrunning clutch device 5. Has been.

  The DC motor device 2 includes an armature coil (not shown) wound around an armature core, a rotor 10 including a commutator 9 electrically connected to the armature coil, and a stator core. A field coil (field winding) 19 wound around a cylindrical yoke 18 and a terminal wire 19a of the field coil (field winding) 19 are connected to a lead wire of the positive brush 17. The stator 30, the metal end bracket 11, the metal negative side holder plate 12 fixed to the bottom surface of the end bracket 11, and the negative side brush fixed directly on the negative side holder plate 12. Gold which is paired with the negative electrode side holder plate 12 and the negative electrode side brush 14 which is slidably held by the negative electrode side brush holder 13 and abuts against the commutator 9. A positive electrode side holder plate 15, a positive electrode side brush holder 16 made of a conductive material (for example, a galvanized steel plate) directly fixed on the positive electrode side holder plate 15, and a slide on the positive electrode side brush holder 16. A positive electrode brush 17 that is held movably and abuts against the commutator 9.

  One end of the lead wire of the negative electrode side brush 14 is electrically connected to the negative electrode side holder plate 12, and the lead wire of the positive electrode side brush 17 is electrically connected directly to the positive electrode side holder plate 15. The lead wire of the positive-side brush 17 is directly connected to a terminal wire 19a of a field coil (field winding) 19 that generates a magnetic field built in a cylindrical yoke 18.

  Further, the negative side brush 14 and the positive side brush 17 are pressed against the commutator 9 by the pressing springs 20, respectively, and are in contact with the brush side segments of the commutator 9.

  On the other hand, the electromagnet switch device 7 includes a B terminal 21 electrically connected to a positive terminal of an external power source (battery), an M terminal 23 electrically connected to the DC motor device 2 via an M lead wire 22. , A movable contact 24 capable of connecting (closing) and blocking (opening) between the B terminal 21 and the M terminal 23, and an insulating component 25 made of phenol resin or the like for insulating the periphery of the B terminal 21 and the M terminal 23; And an insulating component 26 made of phenol resin or the like for insulating the surroundings of the movable contact 24.

  The opening / closing operation of the movable contact 24 is performed by an electromagnet (not shown) built in the electromagnet switch device 7 and simultaneously with the attracting operation of the plunger 6.

  Further, the DC motor device 2 has a crossover holder 27 positioned between the negative electrode side holder plate 12 and the field coil (field winding) 19, and is held by the crossover holder 27, and inputs from an external power source are field-input. A crossover wire 28 distributed to the coil (field winding) 19, and an M lead wire 22 that electrically connects the M terminal 23 and the crossover wire 28 are provided. The terminal of the field coil (field winding) 19 The wire 19 a is connected to the crossover wire 28 and the positive electrode side holder plate 15 or the positive electrode side brush 17 while being supported by the snap fit portions 27 a and 27 b of the crossover wire holder 27. Note that the crossover 28 is positioned on the upstream side of the field coil (field winding) 19 in the electric circuit, and one end of the plurality of field coils (field winding) 19 is connected thereto.

  Moreover, the crossover holder 27 has a protrusion 27c for supporting the positive electrode side holder plate 15. The protrusion 27c is made of an electrically insulating member (polyamide or the like) and connected to the downstream side in the electric circuit. The field coil (field winding) 19 is disposed between the terminal wire 19 a and the crossover wire 28.

  In this embodiment, the resistor that suppresses a decrease in the power supply voltage at the time of starting the engine of the engine starting device 1 to a predetermined value is configured by a field coil (field winding) 19. .

  For example, let us consider a case where an electromagnetic magnet is connected in parallel in 6 poles as the field coil (field winding) 19.

  The starter starting current becomes 650 A from the open voltage 12 V of the external power source (battery), and the starter internal resistance of 11.5 mΩ is required to suppress the energization of this large current.

  However, since the internal resistance of the conventional permanent magnet type starter is 6 mΩ, the remaining 5.5 mΩ is required.

  Therefore, 5.5 mΩ is earned by changing the field system from permanent magnet type to electromagnetic magnet type. Since the electromagnetic magnets are connected in parallel with 6 poles, the resistance value of one electromagnetic magnet is 33 mΩ. In order to have a resistance value of 33 mΩ with one electromagnetic magnet, the following specifications are used.

R = ρL / A
Here, R: resistance value, ρ: resistivity = 1.7 × 10 ⁻⁵ (in the case of copper), L: length of copper wire, and A: cross-sectional area of copper wire.

  As can be seen from the above equation, when the resistance value is constant (33 mΩ), when the value of the cross-sectional area A is increased, the length L must be increased accordingly. As a result, the volume of the resistor is increased and the motor is also enlarged, so that the cross-sectional area is selected to be small.

  Next, the operation, action, and effect of the engine starter 1 of this embodiment described above will be described.

  When the internal combustion engine is started, for example, a key switch (not shown) is turned on to excite the electromagnet, whereby the B terminal 21 of the electromagnet switch device 7 electrically connected to the external power source and the M of the DC motor device 2 are energized. The movable contact 24 for connecting and disconnecting the M terminal 23 electrically connected via the lead wire 22 is closed, the B terminal 21 and the M terminal 23 are connected, the external power source, the B terminal 21, and the movable contact 24, current flows through an electric circuit including the M terminal 23, the field coil (field winding) 19, the positive brush 17, the commutator 9, the rotor coil, and the negative brush 14.

  In this way, the rotor 10 and the output shaft 4 of the DC motor device 2 are rotated. Once started, the key switch is turned off to release the attractive force of the electromagnet, open the movable contact 24, cut off the current flow, and stop the rotation of the DC motor device 2.

  In such an engine starter 1 of this embodiment, the field coil (field winding) 19 is configured with a resistor that suppresses a decrease in the power supply voltage to a predetermined value when the engine starter 1 starts the engine. At the same time, the terminal wire 19a of the field coil (field winding) 19 is supported by the snap-fit portions 27a and 27b of the crossover holder 27, thereby securing the mounting location of the resistor and driving the resistor. Therefore, it is possible to suppress the voltage drop without providing an additional circuit, reduce the influence from engine vibration, and to the terminal line 19a of the field coil (field winding) 19. The effect which suppresses the mechanical load of can be acquired.

  Further, when the terminal wire 19a of the field coil (field winding) 19 is joined to the crossover wire 28 and the positive side holder plate 15, the position of the terminal wire 19a of the field coil (field winding) 19 is stabilized and assembled. The effect which improves can be acquired.

  Therefore, according to this embodiment, the engine starting device 1 itself has a predetermined internal resistance necessary for suppressing the voltage drop without using a separate resistor, so that the mounting property of the starting device is improved. Also, it is possible to simplify the electric circuit constituting the starter.

  Further, even when a wire having a small cross-sectional area is used to obtain a predetermined internal resistance by constraining a part of the terminal wire 19a of the field coil (field winding) 19 by a holding member, the vibration of the engine Therefore, it is possible to achieve a highly reliable engine starter 1.

  The above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Engine starting device, 2 ... DC motor device, 3 ... Ring gear, 4 ... Output shaft, 5 ... Overrunning clutch device, 6 ... Plunger, 7 ... Electromagnetic switch device, 8 ... Shift lever, 9 ... Commutator, 10 DESCRIPTION OF SYMBOLS ... Rotor, 11 ... End bracket, 12 ... Negative electrode side holder plate, 13 ... Negative electrode side brush holder, 14 ... Negative electrode side brush, 15 ... Positive electrode side holder plate, 16 ... Positive electrode side brush holder, 17 ... Positive electrode side brush, 18 ... Yoke, 19 ... Field coil (field winding), 19a ... Field coil terminal wire, 20 ... Pressing spring, 21 ... B terminal, 22 ... M lead wire, 23 ... M terminal, 24 ... Moving contact, 25, 26 ... Insulating part, 27 ... Crossover holder, 27a, 27b ... Snap-fit portion of the crossover holder, 27c ... Projection, 28 ... Crossover, 30 ... Fixed Child.

Claims (7)

An electric motor device, an output shaft that transmits the rotational force from the electric motor device to the ring gear, a clutch device that is slidably fitted on the output shaft and that transmits the rotational force from the output shaft, and an electromagnet An engine starter comprising an electromagnet switch device having a plunger that is attracted and driven at the time of excitation, and a shift lever having one end engaged with the plunger and the other end engaged with the clutch device,
An engine starter characterized in that a resistor that suppresses a decrease in power supply voltage at the time of engine start of the engine starter to a predetermined value is provided inside the electric motor device. The engine starter according to claim 1,
The motor device includes an armature coil wound around an armature core, a rotor including a commutator electrically connected to the armature coil, a stator core, and a yoke on a cylinder. The internal field winding and the terminal wire extending from the field winding are composed of a stator connected to the lead wire of the positive side brush,
The engine starter characterized in that the resistor is constituted by the field winding. The engine starting device according to claim 2,
The electric motor device supports a positive side brush that supplies power to the commutator, a positive side brush holder that holds the positive side brush, a positive side holder plate that holds the positive side brush holder, and the positive side holder plate And a crossover holder
The engine starter characterized in that the crossover holder is disposed between the positive side holder plate and the field winding. The engine starter according to claim 3,
The connecting wire is located upstream of the field winding, connected to one end of the plurality of field windings, and includes a connecting wire that distributes input from a power source to the plurality of field windings. Is held by the crossover holder. The engine starting device according to claim 4,
A part of the terminal wire of the field winding is supported by the crossover holder. The engine starting device according to claim 5,
The crossover holder has a protrusion for supporting the positive electrode side holder plate, and the protrusion is made of an electrically insulating member, and the terminal wire of the field winding connected to the downstream side and the protrusion An engine starter disposed between the crossovers. The engine starter according to claim 6, wherein
The engine starting device, wherein the positive side holder plate is made of a conductive material, and one end of the field winding is connected to a lead wire of the positive side brush.

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