JP5645861B2 - Starter - Google Patents

Description

  The present invention relates to a starter for starting an engine.

  As a starter for starting the engine, for example, there is a starter shown in Patent Document 1. This starter is provided with a magnet switch for conducting or supplying a current between the battery and the starter motor. Between the magnet switch and the starter motor, an energization current from the battery is made to be conducted through a lead wire.

JP 60-261799 A

  In the starter of Patent Document 1 described above, in order to wire between the magnet switch and the starter motor, the external terminal, the lead wire, the tube that insulates the outer periphery of the lead wire, and the neighboring member that penetrates the lead wire and the tube into the motor case An insulating bush and a lead brush lead wire connected to the motor commutator are required.

  In the conventional insulating bush structure, the lead wire is fixed by utilizing the action of elastically connecting the elastic members to each other at the inner cylindrical portion through which the lead wire is inserted. Thus, in the wiring of the lead wire to the magnet switch, the lead wire is inevitably bent or twisted outside the motor case.

  An object of the present invention is to provide a starter that can reliably fix a lead wire while preventing the lead wire from being displaced from a bush even if the lead wire has an external action during assembly work of the starter.

  The starter of the present invention has a substantially conical taper on the inner diameter surface of the bush to prevent the lead wire from being displaced from the outside of the bush, and a lead from the inner side of the bush having a substantially conical taper on the inner surface of the bush. It features a structure that allows easy positioning of the wire.

  According to the present invention, the lead wire is securely fixed inside the bush to prevent the lead wire from being displaced. As a result, the lead wire is prevented from coming into contact with the motor commutator inside the motor case. A simple motor energization circuit can be realized.

  Further, according to the present invention, the lead wire can be securely fixed by the bush of the motor case even if any manual work such as bending or twisting is applied in the assembly process.

FIG. 3 is a structural diagram of a starter equipped with a starter bush according to the present invention. It is sectional drawing which shows the bush for starters of one Example by this invention. It shows before and after the change of the bush shape according to the present invention. Starter circuit diagram.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a partial cross-sectional view of a starter assembled with a lead wire insulation bush according to the present invention as seen from the side. FIG. 2 is a partial cross-sectional view showing a lead wire insulation bush according to an embodiment of the present invention. FIG. 3 is a sectional view showing an example of the present invention.

  The starter shown in FIG. 1 includes a starter motor 1 that constitutes a DC motor device that rotates an armature 4 with a current that is roughly divided, and a magnet switch 2 as a switch device that supplies current to the starter motor 1. It is comprised by these two.

  At the rear end of the starter motor 1 (left side in FIG. 1 and FIG. 2), there is a holding plate 53 for fixing the positive and negative brush holders 51 and 52, and a bottom for fixing the holding plate 53 with screws. A cylindrical metal rear bracket 6 is provided. On the holding plate 53, a positive brush holder 51 that holds the plus-side brush 71 that is in contact with the commutator 41 is fixed via an insulating plate 54. As shown in FIG. 2, a brush holder 52 that holds the minus-side brush 72 movably and a minus-side brush pigtail 73 following the minus-side brush 72 are directly fixed on the holding plate. Yes.

  The magnet switch 2 is screwed and fixed to the external input terminal 22 electrically connected to the external power source, the rod-shaped M terminal 21 electrically connected via the plus-side brush lead wire 31, and the M terminal 21. A plate-like terminal 32 to which one end of the plus-side brush lead wire 31 is connected, and a movable contact 23 capable of connecting and disconnecting the M terminal 21 and the external input terminal 22 are provided.

  The plus-side brush lead wire 31 is a stranded wire or a knitted wire composed of a plurality of conductors. Further, the plus-side brush lead wire 31 has a portion penetrating the motor case portion, that is, a portion taken out from the rear bracket 6, in order to ensure insulation from the metal rear bracket 6 and to prevent rainwater or the like from entering the motor portion. It is inserted through the bush 3 fitted to seal and ensure water resistance and the like. Further, as shown in FIG. 3, the bush 3 has a shape having an opening angle θ toward the starter motor 1.

  Next, the operation of the starter will be described with reference to FIGS. FIG. 4 is an electric circuit diagram of the starter.

  In FIG. 4, the engine start switch is closed with the ignition key 24 turned on. As a result, a current is supplied from the battery 8 to the coil 26 of the solenoid 25, and the movable iron core 27 is attracted to the fixed contacts 21a and 22a. Accordingly, the movable contact 23 is connected to the battery-side fixed contact 22a and the motor-side fixed contact 21a. Contact. As a result, the battery side fixed contact 22 a and the motor side fixed contact 21 a are brought into conduction through the movable contact 23. At this time, since the M terminal 21 and the plus side brush 71 are electrically connected via the plus side brush lead wire 31, the current introduced from the battery 8 into the starter is the M terminal of the magnet switch 2. 21 → terminal 32 → plus-side brush lead wire 31 → plus-side brush 71 of motor section → segment of commutator 41 in contact with plus-side brush 71 → coil 42 of armature 4 → minus-side brush 72 of commutator 41 The segment flows in the following order: segment in contact with negative side → negative side brush 72 → negative side pigtail 73 → holding plate 53 → rear bracket 6 (ground).

  In this way, the armature 4 of the motor unit is rotated. Here, in the starter of the present embodiment, the vicinity of the through portion of the rear bracket 6 in the plus side brush lead wire 31 is included in the bush 3 which is an insulating member, thereby the plus side brush lead wire 31 and the motor case. Insulation with rainwater is prevented, and intrusion of rainwater and the like from this through portion is prevented. Here, after the engine is started by starting the starter as described above, the ignition key 24 is returned to open the contact of the magnet switch 2, the current is cut off, and the starter stops.

  Next, the effect of this Embodiment is demonstrated below.

  In the present embodiment, a substantially tapered conical shape is provided on the inner diameter surface of the insulating bush, which is a portion including the plus-side lead wire, and the opening of the bush is formed to be equal to the substantially outer diameter of the lead wire to be inserted. Therefore, the assembly with the lead wire can be facilitated.

  Further, in this embodiment, the inner diameter dimension of the bush is formed to be approximately the same as the outer diameter dimension of the lead wire to be inserted, and the substantially tapered conical shape is a shape in which the inclination is increased from the outside of the motor case to the direction of the motor commutator. Therefore, it is easy to align the lead wires inside the bush. In addition, since the lead wire is tightened on the narrow taper diameter side in the direction from the narrow side to the wide side of the substantially tapered cone shape, the lead wire inadvertently contacts the motor commutator in order to prevent displacement. Can be eliminated.

  Further, in this embodiment, the lead wire is constituted by either a stranded wire or a knitted wire composed of a plurality of conductors, and the lead wire assembled to the bush has an inner diameter with respect to the substantially tapered conical shape of the bush inner diameter surface portion. The lead wire is not displaced toward the inside of the bush due to the flexibility of twisting or knitting of the lead wire in the vicinity of the outside of the bush on the narrow side. As a result, the lead wire can be securely fixed.

  Further, in this embodiment, in addition to the lead wire inserted through the inner diameter surface of the bush, an insulating tube can be interposed between them. As a result, the bush structure can be set to an integral type or a separate structure of the tube for the purpose of insulating the lead wire, so that the options for the insulation specification of the lead wire are expanded.

  As described above, the present embodiment has been described as the bush used for the starter. However, the bush can be used as a rotating electrical machine such as a motor or a lead wire insulating component of an electric device other than the starter.

  In addition, the tapered conical shape of the inner diameter surface of this embodiment is formed with respect to the bush on the block, but the inner diameter surface has a tapered conical shape instead of the entire block, and a part of the connecting inner diameter surface is a right cone shape. It doesn't matter.

DESCRIPTION OF SYMBOLS 1 Starter motor 2 Magnet switch 3 Bush 4 Armature 6 Rear bracket 8 Battery 21 M terminal 22 External input terminal 21a Motor side fixed contact 22a Battery side fixed contact 23 Movable contact 24 Ignition key 25 Solenoid 26 Coil 31 Plus side brush lead wire 32 Terminal 33 Tube 41 Commutator 51 Positive Brush Holder 52 Negative Brush Holder 53 Holding Plate 54 Insulating Plate 71 Plus Side Brush 72 Negative Side Brush 73 Negative Side Pig Pigtail

Claims (1)

In the starter for starting the engine,
A starter motor whose output shaft is rotationally driven by supplying current;
It has a magnet switch that switches between conduction and non-conduction between the battery and starter motor,
A connecting terminal electrically connected as a current path from the magnet switch to the starter motor, a plus side lead wire, a plus side brush and a minus side brush that are in contact with the commutator of the starter motor, and a minus side that grounds the minus side brush. Composed of pigtails
Having an insulating bush including the positive lead wire;
The inner surface of the bush has a substantially tapered conical shape ,
The inner diameter of the bush is formed substantially equal to the outer diameter of the lead wire to be inserted, and the motor casing
In the vicinity of the through-hole, the approximately tapered conical shape of the motor commutator from the outside of the motor case
It is a shape that the inclination increases with respect to the direction,
The substantially tapered conical shape is a shape in which the narrow taper diameter side is located on the outer diameter side of the bush, and the wide taper diameter side forms an opening that opens toward the inside of the starter motor of the bush.
The lead wire is composed of a stranded wire or a knitted wire composed of a plurality of conductors,
The assembled lead wire is the bush on the narrow inner diameter side with respect to the substantially tapered conical shape of the bush inner surface.
Inside the bush using the flexibility of twisting or knitting of the lead wire elastically near the outside
A starter characterized in that the lead wire is not displaced in the direction .